CN115940626B - Power supply control circuit, power supply control method, electronic equipment and storage medium - Google Patents
Power supply control circuit, power supply control method, electronic equipment and storage medium Download PDFInfo
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Abstract
The application provides a power supply control circuit, a power supply control method, electronic equipment and a storage medium. The power supply control circuit includes: the control unit is used for controlling the conduction state of the first voltage division unit, the second voltage division unit or the third voltage division unit according to the input control signal; the first voltage dividing unit is used for adjusting the output voltage of the power supply control circuit to be a first voltage; the second voltage dividing unit is used for adjusting the output voltage of the power supply control circuit to be a second voltage; and the third voltage dividing unit is used for adjusting the output voltage of the power supply control circuit to be a third voltage. The power supply control method is applied to the power supply control circuit. The electronic equipment comprises the power supply control circuit. The computer program stored on the storage medium performs the above-described power control method. According to the embodiment of the application, the output voltage can be regulated only by using a common voltage-reducing circuit chip, so that the effects of reducing design cost without adopting an expensive chip with a specific model are achieved.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and in particular, to a power control circuit, a power control method, an electronic device, and a storage medium.
Background
At present, many electronic device manufacturers propose products meeting the specifications of electronic products produced by the manufacturers. For example, for chips produced by some manufacturers, the power supply can provide three different voltages to power such chips under different operating conditions, controlled by the tri-state GPIO signals. A common step-down circuit (BUCK circuit) cannot achieve this function and a specific controller that meets the manufacturer's specifications must be used. The control price conforming to the specific specification is often quite expensive, and the corresponding product design is not flexible enough.
Disclosure of Invention
The present application has been made in view of at least one of the above-mentioned problems occurring in the prior art. According to an aspect of the present application, there is provided a power supply control circuit, including a control unit, a first voltage division unit, a second voltage division unit, and a third voltage division unit, where the control unit is connected to the first voltage division unit, the second voltage division unit, and the third voltage division unit, respectively;
the control unit is used for controlling the conduction state of the first voltage division unit, the second voltage division unit or the third voltage division unit according to an input control signal;
The first voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a first voltage;
the second voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a second voltage;
and the third voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a third voltage.
In some embodiments, the control unit includes a first comparator, a second comparator, and a switching unit; wherein,,
the first comparator comprises a first input terminal, a second input terminal and a first output terminal, wherein the first input terminal and the second input terminal respectively receive a first input voltage and a first reference voltage, and the first output terminal outputs a first output signal according to a comparison result between the first input voltage and the first reference voltage; wherein the first input voltage is generated according to the input control signal;
the second comparator comprises a third input terminal, a fourth input terminal and a second output terminal, the first input terminal and the second input terminal respectively receive a second input voltage and a second reference voltage, and the second output terminal outputs a second output signal according to a comparison result between the second input voltage and the second reference voltage; wherein the second input voltage is generated in accordance with the input control signal;
The switch unit receives the first output signal and the second output signal, and the switch unit controls and switches the conduction states of the first voltage dividing unit, the second voltage dividing unit and the third voltage dividing unit according to the first output signal and the second output signal.
In some embodiments, the switching unit includes a first switching element and a second switching element; the first output signal controls the switching state of the first switching element, and the second output signal controls the switching state of the second switching element.
In some embodiments, the first voltage dividing unit outputs the first voltage when the first switching element is opened and the second switching element is closed; or alternatively
The second voltage dividing unit outputs the second voltage when the first switching element is turned off and the second switching element is turned off; or alternatively
The third voltage dividing unit outputs the third voltage when the first switching element is turned off and the second switching element is turned on.
In some embodiments, the first voltage dividing unit includes a first resistor, a second resistor, and a third resistor, where a first end of the first resistor is connected to a first end of the second resistor, a second end of the first resistor is connected to an output end of the power control circuit, a second end of the second resistor is grounded, a first end of the third resistor is connected to the first switching element, and a second end of the third resistor is connected to a second end of the first resistor;
The second voltage division unit comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, and the second end of the second resistor is grounded;
the third voltage dividing unit comprises a first resistor, a second resistor and a fourth resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, the second end of the second resistor is grounded, the first end of the fourth resistor is connected with the first end of the second resistor, and the second end of the fourth resistor is connected with the second switching element.
In some embodiments, the first voltage dividing unit outputs the first voltage when the first switching element is opened and the second switching element is closed; or alternatively
The second voltage dividing unit outputs the second voltage when the first switching element is turned off and the second switching element is turned off; or alternatively
The third voltage dividing unit outputs the third voltage when the first switching element is turned off and the second switching element is turned on.
In some embodiments, the first voltage dividing unit includes a first resistor and a second resistor, wherein a first end of the first resistor is connected to a first end of the second resistor, a second end of the first resistor is connected to an output end of the power control circuit, and a second end of the second resistor is grounded;
the second voltage division unit comprises a first resistor, a second resistor and a third resistor, wherein a first end of the first resistor is connected with a first end of the second resistor, a second end of the first resistor is connected with an output end of the power supply control circuit, a second end of the second resistor is grounded, a first end of the third resistor is connected with a first end of the first resistor, and a second end of the third resistor is connected with the first switch element;
the third voltage dividing unit comprises a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, the second end of the second resistor is grounded, the first end of the fourth resistor is connected with the first end of the second resistor, and the second end of the fourth resistor is connected with the second switching element.
In some embodiments, the first switching element and the second switching element each comprise a metal-oxide semiconductor field effect transistor.
Another aspect of the embodiments of the present application provides a power control method, including:
the comparison unit receives an input control signal;
the comparison unit generates a first input voltage and a second input voltage according to the input control signal;
the comparison unit generates a first output signal and a second output signal according to the first input voltage and the second input voltage respectively;
the switch unit receives the first output signal and the second output signal and controls the conduction state of the first voltage dividing unit, the second voltage dividing unit or the third voltage dividing unit according to the first output signal and the second output signal;
when the first voltage dividing unit is conducted, the power supply control circuit outputs a first voltage; when the second voltage dividing unit is conducted, the power supply control circuit outputs a second voltage; when the third voltage dividing unit is conducted, the power supply control circuit outputs a third voltage.
In yet another aspect, an electronic device is provided, where the electronic device includes the power control circuit described above.
Yet another aspect of the present embodiments provides a storage medium having stored thereon a computer program which, when executed by a processor, causes the processor to perform the power control method as described above.
According to the power supply control circuit, the method, the electronic equipment and the storage medium, the control unit is used for controlling the conduction state of the first voltage dividing unit, the second voltage dividing unit or the third voltage dividing unit, so that the first voltage dividing unit is conducted and then outputs the first voltage, the second voltage dividing unit is conducted and then outputs the second voltage, the third voltage dividing unit is conducted and then outputs the third voltage, the purpose that an expensive chip with a specific model is not needed can be achieved, the size of the output voltage can be adjusted only by using a common voltage reducing circuit (BUCK circuit) chip, and therefore the effect of reducing design cost is achieved.
Drawings
Fig. 1 shows a schematic diagram of a power supply control circuit according to the conventional art;
FIG. 2 shows a schematic block diagram of a power control circuit according to one embodiment of the present application;
FIG. 3 shows a circuit schematic of a power control circuit according to one embodiment of the present application;
FIG. 4 shows a circuit schematic of a power control circuit according to another embodiment of the present application;
Fig. 5 shows a schematic flow chart of a power control method according to one embodiment of the present application.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the following detailed description refers to the accompanying drawings and the detailed description.
Fig. 1 is a circuit diagram of a power control circuit in the conventional art. The power control circuit PU1 in the conventional art is a BUCK control circuit (other peripheral circuit components such as an inductor, an input/output capacitor, a power device, etc. are not shown in the figure) of a specific manufacturer specification.
Generally, a chip (such as a GPU) conforming to a specific manufacturer's specification needs to be powered by three different operating voltages under different operating conditions. Thus, the power control circuit PU1 receives the tri-state signal via V_CTL, inputs the VID pin, inputs PU1 via REFIN, generates the required voltage via the resistor network shown in FIG. 1, and outputs R EFADJ The pins output different output voltages.
Specifically, the input voltage input from the REFIN terminal is divided by the first branch, the second branch and the third branch, and the output voltage is output through the REFADJ pin via VREF. Wherein the first branch comprises a resistor R connected in parallel REF1 And capacitor C VREF Wherein the resistance R REF1 Is connected with VREF end, resistor R REF1 The second end of (2) is connected with resistor R BOOT Capacitor C VREF Is connected with resistor R at the first end REF1 The second end of the capacitor is grounded to RGND. The second branch comprises a resistor R connected in parallel BOOT Resistance R REFADJ And capacitor C REFADJ Wherein the resistance R REFADJ A first terminal of (1) is connected with REFADJ terminal, a resistor R REFADJ The second end of (2) is connected with resistor R BOOT Resistance R BOOT The second end of (2) is connected with resistor R REF2 Capacitor C REFADJ Is connected with R at the first end of BOOT Is the first of (1)Terminal, capacitor C REFADJ Is grounded to RGND. The third branch comprises a resistor R connected in parallel REF2 And capacitor C REFIN Wherein the resistance R REF2 A resistor R connected to the REFIN terminal REF2 Is grounded to RGND, capacitor C REFIN Is connected with resistor R at the first end REF2 Capacitor C REFIN Is grounded to RGND.
In a specific example, the values of the elements may be set as follows, depending on the actual output voltage requirements: c (C) VREF =0.1μF，R REF1 =20KΩ，R REFADJ =20KΩ，C REFADJ =2.7nF，R BOOT =2KΩ，R REF2 =18KΩ。
The conventional technology requires that the power control circuit PU1 must meet the NVIDIA OVR specification, which is expensive, cannot use a common BUCK chip, and is not flexible enough in designing the circuit.
Based on at least one technical problem described above, the present application provides a power supply control circuit, the circuit including a control unit, a first voltage division unit, a second voltage division unit, and a third voltage division unit, wherein the control unit is connected to the first voltage division unit, the second voltage division unit, and the third voltage division unit, respectively; the control unit is used for controlling the conduction state of the first voltage dividing unit, the first voltage dividing unit or the third voltage dividing unit according to an input control signal; the first voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a first voltage; the second voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a second voltage; and the third voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a third voltage. According to the embodiment of the application, the control unit is used for controlling the conduction state of the first voltage dividing unit, the second voltage dividing unit or the third voltage dividing unit, so that the first voltage dividing unit is conducted to output the first voltage, the second voltage dividing unit is conducted to output the second voltage, the third voltage dividing unit is conducted to output the third voltage, an expensive chip with a specific model is not needed, and the size of the output voltage can be adjusted only by using a common voltage reducing circuit (BUCK circuit) chip, so that the effect of reducing the design cost is achieved.
FIG. 2 shows a schematic block diagram of a power control circuit according to an embodiment of the present application; as shown in fig. 2, the power supply control circuit 200 according to the embodiment of the present application may include a control unit 10, a first voltage division unit 20, a second voltage division unit 30, and a third voltage division unit 40.
Wherein the control unit 10 is connected to the first voltage dividing unit 20, the second voltage dividing unit, and 30 the third voltage dividing unit 40, respectively.
The control unit 10 is configured to control the on state of the first voltage division unit 20, the second voltage division unit 30, or the third voltage division unit 40 according to an input control signal;
the first voltage dividing unit 20 is configured to adjust an output voltage of the power control circuit 200 after being turned on, so that the output voltage of the power control circuit 200 is a first voltage;
a second voltage dividing unit 30, configured to adjust an output voltage of the power control circuit 200 after being turned on, so that the output voltage of the power control circuit 200 is a second voltage;
and a third voltage dividing unit 40, configured to adjust the output voltage of the power control circuit 200 after being turned on, so that the output voltage of the power control circuit 200 is a third voltage.
In one embodiment of the present application, as shown in fig. 3, the control unit 10 includes a first comparator U1A, a second comparator U2A, and a switching unit; wherein,,
The first comparator U1A includes a first INPUT terminal INPUT1_n, a second INPUT terminal INPUT1_p, and a first OUTPUT terminal OUTPUT1_1, the first INPUT terminal INPUT1_n and the second INPUT terminal INPUT1_p respectively receive a first INPUT voltage and a first reference voltage, and the first OUTPUT terminal OUTPUT1_1 OUTPUTs a first OUTPUT signal according to a comparison result between the first INPUT voltage and the first reference voltage. The first comparator U1A is also respectively connected with a 5V power supply and ground.
Wherein the first input voltage is generated according to the input control signal v_ctl.
In one particular example, the first reference voltage may be generated in accordance with a voltage divider circuit. As shown in fig. 3, the second INPUT terminal INPUT1_p passes through the resistor PR 5 A 1.8V power supply is connected, and the second INPUT terminal INPUT1_P passes through a resistor PR 6 And (5) grounding. When the resistance PR is 5 =49.9KΩ，PR 6 When=10kΩ, the first reference voltage received by the second INPUT terminal INPUT1_p is 0.3V.
The second comparator U2A includes a third INPUT terminal INPUT2_p, a fourth INPUT terminal INPUT2_n, and a second OUTPUT terminal OUTPUT2_1, the third INPUT terminal INPUT2_p and the fourth INPUT terminal INPUT2_n respectively receive a second INPUT voltage and a second reference voltage, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a second OUTPUT signal according to a comparison result between the second INPUT voltage and the second reference voltage. The first comparator U2A is also respectively connected with a 5V power supply and ground.
Wherein the second input voltage is generated in accordance with the input control signal.
In one particular example, the first reference voltage may be generated in accordance with a voltage divider circuit. As shown in fig. 3, the fourth INPUT terminal INPUT2_n passes through the resistor PR 7 A 1.8V power supply is connected, and the fourth INPUT terminal INPUT2_N passes through a resistor PR 8 And (5) grounding. When the resistance PR is 7 =10KΩ，PR 8 When=49.9kΩ, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.3V.
The switch unit 101 receives the first output signal and the second output signal, and controls to switch the conducting states of the first voltage dividing unit, the second voltage dividing unit and the third voltage dividing unit according to the first output signal and the second output signal.
In one example, in combination with fig. 3, the switching unit 103 includes a first switching element PQ 1 And a second switching element PQ 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the first output signal controls the first switching element PQ 1 Is opened by (2)An off state, the second output signal controls the second switching element PQ 1 Is a switching state of (a).
Wherein the first switching element PQ 1 And the second switching element PQ 2 Each comprising a metal-oxide semiconductor field effect transistor.
In one example, continuing with fig. 3,
when the first switching element PQ 1 Open and the second switching element PQ 2 When the first voltage dividing unit is closed, the first voltage dividing unit outputs the first voltage; or alternatively
When the first switching element PQ 1 Closing and said second switching element PQ 2 When the power supply is turned off, the second voltage dividing unit outputs the second voltage; or alternatively
When the first switching element PQ 1 Closing and said second switching element PQ 2 When the switch is turned on, the third voltage dividing unit outputs the third voltage.
Continuing to combine with FIG. 3, the first voltage dividing unit includes a first resistor PR 1 Second resistor PR 2 And a third resistor PR 3 Wherein the first resistor PR 1 Is connected to the second resistor PR 2 The first resistor PR is provided with 1 A second end connected to the output end of the power control circuit, and a second resistor PR 2 Is grounded to the second end of the third resistor PR 3 Is connected to the first switching element PQ 1 The third resistor PR 3 Is connected to the first resistor PR 1 Is a second end of (2);
the second voltage division unit comprises the first resistor PR 1 And the second resistor PR 2 Wherein the first resistor PR 1 Is connected to the second resistor PR 2 The first resistor PR is provided with 1 A second end connected to the output end of the power control circuit, and a second resistor PR 2 Is grounded;
the third voltage dividing unit comprises the first resistor PR 1 The second resistor PR 2 And a fourth resistor PR 4 Wherein the first resistor PR 1 Is connected to the second resistor PR 2 The first resistor PR is provided with 1 A second end connected to the output end of the power control circuit, and a second resistor PR 2 Is grounded at the second end of the fourth resistor PR 4 Is connected to the second resistor PR 2 The fourth resistor PR is arranged at the first end of 4 Is connected to the second switching element PQ 2 。
Wherein the first switching element PQ 1 A gate connected to the output terminal of the first comparator U1A, a first switching element PQ 1 A source of (A) is connected to the FB pin, a first switching element PQ 1 The drain electrode of (C) is connected with a third resistor PR 3 Is provided. The second switching element PQ 2 A gate connected to the output end of the first comparator U2A, a second switching element PQ 2 The drain electrode of (a) is connected with the fourth resistor PR 4 Second switching element PQ 2 The source of (c) is grounded.
As shown in FIG. 3, the resistor PR 2 And also with the capacitor PC 1 And are connected in parallel. The second resistor PR 2 And the first connection of the power supply control circuit is also connected with the 6 th pin FB of the power supply control circuit. The power supply control circuit further includes a 16 th pin lx_3, a 17 th pin lx_4, a 18 th pin lx_5, a 19 th pin lx_6, a 20 th pin lx_7, a 21 st pin lx_8, a 11 th pin pgnd_1, a 12 th pin pgnd_2, a 13 th pin pgnd_3, a 22 th pin pgnd_4, a 23 rd pin pgnd_5, and the like. The output terminal V_OUT of the power supply control circuit is connected with each pin through an inductor PL 1. The output end V_OUT of the power supply control circuit also comprises a PC connected in parallel 2 、PC 3 、PC 4 。
In the power supply control circuit in the embodiment of the present application, the principle of controlling the output voltage according to the input control signal v_ctl is as follows:
in the first case, when the first INPUT voltage generated by the INPUT control signal v_ctl is the lowest voltage (e.g., less than 0.3V), the first INPUT voltage of the first INPUT terminal INPUT1_n is less than 0.3V, the first reference voltage received by the second INPUT terminal INPUT1_p is 0.3V, thenThe OUTPUT terminal OUTPUT1_1 OUTPUTs a high level signal; the first INPUT voltage of the third INPUT terminal INPUT2_p is less than 0.3V, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.5V, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a low level signal. Therefore, the first switching element PQ 1 On, second switching element PQ 2 Are not conductive. At this time, the first resistor PR 1 And a third resistor PR 3 Connected in series and then connected with a second resistor PR 2 Connected in series, e.g. PR 1 =10KΩ，PR 2 =9.31KΩ，PR 3 =133 kΩ, and PL 1 =0.22uH，PC 1 =133KΩ，PC 2 =22uF，PC 3 =22uF，PC 4 =330 uF, then pass through the first resistor PR 1 Second resistor PR 2 And a third resistor PR 3 After voltage division, the output voltage of the output terminal v_out is the lowest voltage of 1.2V.
In the second case, when the first INPUT voltage generated by the INPUT control signal v_ctl is an intermediate voltage (for example, 0.9V), the first INPUT voltage of the first INPUT terminal INPUT1_n is 0.9V, the first reference voltage received by the second INPUT terminal INPUT1_p is 0.3V, and the first OUTPUT terminal OUTPUT1_1 OUTPUTs a low level signal; the first INPUT voltage of the third INPUT terminal INPUT2_p is 0.9V, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.5V, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a low level signal; therefore, the first switching element PQ 1 And a second switching element PQ 2 Are not conductive. At this time, the first resistor PR 1 And a second resistance PR 2 Connected in series, e.g. PR 1 =10KΩ，PR 2 The value of the other elements is the same as that of the first resistor PR 1 And a second resistance PR 2 After voltage division, the output voltage of the output terminal v_out is 1.25V.
In the third case, when the first INPUT voltage generated by the INPUT control signal v_ctl is the highest voltage (for example, 1.8V), the first INPUT voltage of the first INPUT terminal INPUT1_n is 1.8V, the first reference voltage received by the second INPUT terminal INPUT1_p is 0.3V, and the first OUTPUT terminal OUTPUT1_1 OUTPUTs a low level signal; first INPUT of the third INPUT terminal INPUT2_PThe INPUT voltage is 1.8V, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.5V, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a high level signal; therefore, the first switching element PQ 1 Non-conductive and second switching element PQ 2 Conducting. At this time, the second resistor PR 2 And a fourth resistor PR 4 Connected in parallel with a first resistor PR 1 Connected in series, e.g. PR 1 =10KΩ，PR 2 =9.31KΩ，PR 2 The value of the other elements is equal to 60.4kΩ, and the first resistor PR is passed through 1 Second resistor PR 2 And a fourth resistor PR 4 After voltage division, the output voltage of the output terminal V_OUT is 1.35V of the highest voltage.
In another embodiment of the present application, as shown in fig. 4, the control unit 10 includes a first comparator U1A, a second comparator U2A, and a switching unit; wherein,,
the first comparator U1A includes a first INPUT terminal INPUT1_p, a second INPUT terminal INPUT1_n, and a first OUTPUT terminal OUTPUT1_1, the first INPUT terminal INPUT1_p and the second INPUT terminal INPUT1_n respectively receive a first INPUT voltage and a first reference voltage, and the first OUTPUT terminal INPUT1_p OUTPUTs a first OUTPUT signal according to a comparison result between the first INPUT voltage and the first reference voltage. The first comparator U1A is also respectively connected with a 5V power supply and ground.
Wherein the first input voltage is generated in accordance with the input control signal.
In one example, the first reference voltage may be generated according to a voltage divider circuit. As shown in fig. 4, the second INPUT terminal INPUT1_n passes through the resistor PR 5 A 1.8V power supply is connected, and the second INPUT terminal INPUT1_N passes through a resistor PR 6 And (5) grounding. When the resistance PR is 5 =40.2KΩ，PR 6 When=20kΩ, the first reference voltage received by the second INPUT terminal INPUT1_n is 0.6V.
The second comparator U2A includes a third INPUT terminal INPUT2_p, a fourth INPUT terminal INPUT2_n, and a second OUTPUT terminal OUTPUT2_1, the third INPUT terminal INPUT2_p and the fourth INPUT terminal respectively receiving a second INPUT voltage and a second reference voltage, the second OUTPUT terminal OUTPUT1_1 outputting a second OUTPUT signal according to a comparison result between the second INPUT voltage and the second reference voltage; wherein the second input voltage is generated in accordance with the input control signal. The first comparator U1A is also respectively connected with a 5V power supply and ground.
The switch unit receives the first output signal and the second output signal, and the switch unit controls and switches the conduction states of the first voltage dividing unit, the second voltage dividing unit and the third voltage dividing unit according to the first output signal and the second output signal.
In one example, in conjunction with fig. 4, the switching unit includes a first switching element PQ 1 And a second switching element PQ 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the first output signal controls the first switching element PQ 1 The second output signal controls the second switching element PQ 2 Is a switching state of (a).
Wherein the first switching element PQ 1 And the second switching element PQ 2 Each comprising a metal-oxide semiconductor field effect transistor.
In one example, with continued reference to fig. 4, when the first switching element PQ 1 Open and the second switching element PQ 2 When the first voltage dividing unit is closed, the first voltage dividing unit outputs the first voltage; or alternatively
When the first switching element PQ 1 Closing and said second switching element PQ 2 When the power supply is turned off, the second voltage dividing unit outputs the second voltage; or alternatively
When the first switching element PQ 1 Closing and said second switching element PQ 2 When the switch is turned on, the third voltage dividing unit outputs the third voltage.
Continuing to combine with FIG. 4, the first voltage dividing unit includes a first resistor PR 1 And a second resistance PR 2 Wherein the first resistor PR 1 Is connected to the second resistor PR 2 The first resistor PR is provided with 1 A second end connected to the output end of the power control circuit, and a second resistor PR 2 Is the first of (2)The two ends are grounded;
the second voltage division unit comprises the first resistor PR 1 The second resistor PR 2 And a third resistor PR 3 Wherein the first end PR of the first resistor 1 Is connected to the second resistor PR 2 The first resistor PR is provided with 1 A second end connected to the output end of the power control circuit, and a second resistor PR 2 Is grounded to the second end of the third resistor PR 3 Is connected to the first resistor PR 1 The third resistor PR is arranged at the first end of 3 Is connected to the first switching element PQ 1 ；
The third voltage dividing unit comprises the first resistor PR 1 The second resistor PR 2 The third resistor PR 3 And a fourth resistor PR 4 Wherein the first resistor PR 1 Is connected to the second resistor PR 2 The first resistor PR is provided with 1 The second end of the second resistor PR2 is grounded, and the fourth resistor PR is connected with the output end of the power supply control circuit 4 Is connected to the second resistor PR 2 The fourth resistor PR is arranged at the first end of 4 Is connected to the second switching element PQ 2 。
Wherein the first switching element PQ 1 A gate connected to the output terminal of the first comparator U1A, a first switching element PQ 1 A source of (A) is connected to the FB pin, a first switching element PQ 1 The drain electrode of (C) is connected with a third resistor PR 3 Is provided. The second switching element PQ 2 A gate connected to the output end of the first comparator U2A, a second switching element PQ 2 The drain electrode of (a) is connected with the fourth resistor PR 4 Second switching element PQ 2 The source of (c) is grounded.
As shown in FIG. 4, the resistor PR 2 And also with the capacitor PC 1 Connected in parallel. The second resistor PR 2 And the first connection of the power supply control circuit is also connected with the 6 th pin FB of the power supply control circuit. The power supply control circuit further includes a 16 th pin LX_3, a 17 th pin LX_4, a 18 th pin LX_5, a 19 th pin LX_6,Pin lx_7, pin lx_8, pin 11 pgnd_1, pin 12 pgnd_2, pin 13 pgnd_3, pin 22 pgnd_4, pin 23 pgnd_5, etc. The output end V_OUT of the power supply control circuit passes through an inductor PL 1 Is connected with each pin. The output end V_OUT of the power supply control circuit also comprises a PC connected in parallel 2 、PC 3 、PC 4 。
In the power supply control circuit in the embodiment of the present application, the principle of controlling the output voltage according to the input control signal v_ctl is as follows:
in the first case, when the first INPUT voltage generated by the INPUT control signal v_ctl is the lowest voltage (less than 0.3V), the first INPUT voltage of the first INPUT terminal INPUT1_p is less than 0.3V, the first reference voltage received by the second INPUT terminal INPUT1_n is 0.6V, and the first OUTPUT terminal OUTPUT1_1 OUTPUTs a low level signal; the first INPUT voltage of the third INPUT terminal INPUT2_p is less than 0.3V, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.5V, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a low level signal. Therefore, the first switching element PQ 1 And a second switching element PQ 2 Are not conductive. At this time, the first resistor PR 1 And a second resistance PR 2 Connected in series, e.g. PR 1 =10KΩ，PR 2 =10kΩ, and PL 1 =0.22uH，PC 1 =133KΩ，PC 2 =22uF，PC 3 =22uF，PC 4 =330 uF, then pass through the first resistor PR 1 And a second resistance PR 2 After voltage division, the output voltage of the output terminal v_out is the lowest voltage of 1.2V.
In the second case, when the first INPUT voltage generated by the INPUT control signal v_ctl is an intermediate voltage (for example, 0.9V), the first INPUT voltage of the first INPUT terminal INPUT1_p is 0.9V, the first reference voltage received by the second INPUT terminal INPUT1_n is 0.6V, and the first OUTPUT terminal OUTPUT1_1 OUTPUTs a high level signal; the first INPUT voltage of the third INPUT terminal INPUT2_p is 0.9V, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.5V, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a low level signal. Therefore, the first switching element PQ 1 On, second switching element PQ 2 Is not conductive. At this time, the second resistor PR 2 And a third resistor PR 3 Connected in parallel and then with a first resistor PR 1 Connected in series, e.g. PR 1 =10KΩ，PR 2 =10KΩ，PR 3 The value of the other elements is equal to 120KΩ, and the first resistor PR is passed through 1 And a second resistance PR 2 And a third resistor PR 3 After voltage division, the output voltage of the output terminal v_out is 1.25V.
In the third case, when the first INPUT voltage generated by the INPUT control signal v_ctl is the highest voltage (for example, 1.8V), the first INPUT voltage of the first INPUT terminal INPUT1_p is 1.8V, the first reference voltage received by the second INPUT terminal INPUT1_n is 0.6V, and the first OUTPUT terminal OUTPUT1_1 OUTPUTs a high level signal; the first INPUT voltage of the third INPUT terminal INPUT2_p is 1.8V, the first reference voltage received by the fourth INPUT terminal INPUT2_n is 1.5V, and the second OUTPUT terminal OUTPUT2_1 OUTPUTs a high level signal; therefore, the first switching element PQ 1 And a second switching element PQ 2 Are all conducted. At this time, the second resistor PR 2 Third resistor PR 3 Fourth resistor PR 4 Connected in series with a first resistor PR 1 Connected in parallel, e.g. PR 1 =10KΩ，PR 2 =10KΩ，PR 3 =120KΩ，PR 4 The value of the other elements is equal to 60.4kΩ, and the first resistor PR1 and the second resistor PR 2 Third resistor PR 3 Fourth resistor PR 4 After voltage division, the output voltage of the output terminal V_OUT is 1.35V of the highest voltage.
When the method is implemented, the resistance of each resistor can be set according to the requirements of actual application scenes, and different output voltage values are obtained.
According to the embodiment of the application, the control unit is used for controlling the conduction state of the first voltage dividing unit, the second voltage dividing unit or the third voltage dividing unit, so that the first voltage dividing unit is conducted to output the first voltage, the second voltage dividing unit is conducted to output the second voltage, the third voltage dividing unit is conducted to output the third voltage, an expensive chip with a specific model is not needed, and the size of the output voltage can be adjusted only by using a common voltage reducing circuit (BUCK circuit) chip, so that the effect of reducing the design cost is achieved.
The power control method of the present application is described below in conjunction with fig. 5, where fig. 5 shows a schematic flow chart of a power control method 500 according to an embodiment of the present application.
S501, a comparison unit receives an input control signal;
s502, the comparison unit generates a first input voltage and a second input voltage according to the input control signal;
s503, the comparison unit generates a first output signal and a second output signal according to the first input voltage and the second input voltage respectively,
s504, the switch unit receives the first output signal and the second output signal and controls the conduction state of the first voltage dividing unit, the second voltage dividing unit or the third voltage dividing unit according to the first output signal and the second output signal;
when the first voltage dividing unit is conducted, the power supply control circuit outputs a first voltage; when the second voltage dividing unit is conducted, the power supply control circuit outputs a second voltage; when the third voltage dividing unit is conducted, the power supply control circuit outputs a third voltage.
According to an embodiment of the application, there is also provided an electronic device including the power control circuit described above.
The power supply control method and the electronic equipment can realize the functions of the power supply control circuit, so that the power supply control circuit has the same beneficial effects as the power supply control circuit.
In addition, according to the embodiment of the application, a storage medium is provided, on which program instructions are stored, which program instructions, when executed by a computer or a processor, are used to perform the corresponding steps of the design method of the power device layout of the embodiment of the application. The storage medium may include, for example, a memory card of a smart phone, a memory component of a tablet computer, a hard disk of a personal computer, read-only memory (ROM), erasable programmable read-only memory (EPROM), portable compact disc read-only memory (CD-ROM), USB memory, or any combination of the foregoing storage media.
The power supply control method, the electronic device and the storage medium according to the embodiments of the present application have the same advantages as the aforementioned power supply control circuit because the aforementioned power supply control circuit can be realized. And will not be described in detail herein.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as set forth in the appended claims.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, e.g., the division of the elements is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another device, or some features may be omitted or not performed.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the present application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in order to streamline the application and aid in understanding one or more of the various inventive aspects, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the application. However, the method of this application should not be construed to reflect the following intent: i.e., the claimed application requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be combined in any combination, except combinations where the features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the present application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Various component embodiments of the present application may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functions of some of the modules according to embodiments of the present application may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present application may also be embodied as device programs (e.g., computer programs and computer program products) for performing part or all of the methods described herein. Such a program embodying the present application may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
The foregoing is merely illustrative of specific embodiments of the present application and the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The power supply control circuit is characterized by comprising a control unit, a first voltage division unit, a second voltage division unit and a third voltage division unit, wherein the control unit is respectively connected with the first voltage division unit, the second voltage division unit and the third voltage division unit;
the control unit is used for controlling the conduction state of the first voltage division unit, the second voltage division unit or the third voltage division unit according to an input control signal;
the first voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a first voltage;
the second voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a second voltage;
the third voltage dividing unit is used for adjusting the output voltage of the power supply control circuit after being conducted so as to enable the output voltage of the power supply control circuit to be a third voltage;
the control unit comprises a first comparator, a second comparator and a switch unit; wherein,,
the first comparator comprises a first input terminal, a second input terminal and a first output terminal, wherein the first input terminal and the second input terminal respectively receive a first input voltage and a first reference voltage, and the first output terminal outputs a first output signal according to a comparison result between the first input voltage and the first reference voltage; wherein the first input voltage is generated according to the input control signal;
The second comparator comprises a third input terminal, a fourth input terminal and a second output terminal, the first input terminal and the second input terminal respectively receive a second input voltage and a second reference voltage, and the second output terminal outputs a second output signal according to a comparison result between the second input voltage and the second reference voltage; wherein the second input voltage is generated in accordance with the input control signal;
the switch unit receives the first output signal and the second output signal, and the switch unit controls and switches the conduction states of the first voltage dividing unit, the second voltage dividing unit and the third voltage dividing unit according to the first output signal and the second output signal.
2. The power supply control circuit according to claim 1, wherein the switching unit includes a first switching element and a second switching element; the first output signal controls the switching state of the first switching element, and the second output signal controls the switching state of the second switching element.
3. The power control circuit of claim 2, wherein,
the first voltage dividing unit outputs the first voltage when the first switching element is opened and the second switching element is closed; or alternatively
The second voltage dividing unit outputs the second voltage when the first switching element is turned off and the second switching element is turned off; or alternatively
The third voltage dividing unit outputs the third voltage when the first switching element is turned off and the second switching element is turned on.
4. The power control circuit of claim 3, wherein,
the first voltage dividing unit comprises a first resistor, a second resistor and a third resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, the second end of the second resistor is grounded, the first end of the third resistor is connected with the first switching element, and the second end of the third resistor is connected with the second end of the first resistor;
the second voltage division unit comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, and the second end of the second resistor is grounded;
the third voltage dividing unit comprises a first resistor, a second resistor and a fourth resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, the second end of the second resistor is grounded, the first end of the fourth resistor is connected with the first end of the second resistor, and the second end of the fourth resistor is connected with the second switching element.
5. The power control circuit of claim 2, wherein,
the first voltage dividing unit outputs the first voltage when the first switching element is opened and the second switching element is closed; or alternatively
The second voltage dividing unit outputs the second voltage when the first switching element is turned off and the second switching element is turned off; or alternatively
The third voltage dividing unit outputs the third voltage when the first switching element is turned off and the second switching element is turned on.
6. The power control circuit of claim 5, wherein the power control circuit comprises a power supply circuit,
the first voltage dividing unit comprises a first resistor and a second resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, and the second end of the second resistor is grounded;
the second voltage division unit comprises a first resistor, a second resistor and a third resistor, wherein a first end of the first resistor is connected with a first end of the second resistor, a second end of the first resistor is connected with an output end of the power supply control circuit, a second end of the second resistor is grounded, a first end of the third resistor is connected with a first end of the first resistor, and a second end of the third resistor is connected with the first switch element;
The third voltage dividing unit comprises a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the first end of the first resistor is connected with the first end of the second resistor, the second end of the first resistor is connected with the output end of the power supply control circuit, the second end of the second resistor is grounded, the first end of the fourth resistor is connected with the first end of the second resistor, and the second end of the fourth resistor is connected with the second switching element.
7. The power control circuit of claim 2, wherein,
the first switching element and the second switching element each include a metal-oxide semiconductor field effect transistor.
8. A power supply control method, characterized in that the method is applied to the power supply control circuit of claims 1 to 7, the power supply control method comprising:
the comparison unit receives an input control signal;
the comparison unit generates a first input voltage and a second input voltage according to the input control signal;
the comparison unit generates a first output signal and a second output signal according to the first input voltage and the second input voltage respectively;
The switch unit receives the first output signal and the second output signal and controls the conduction state of the first voltage dividing unit, the second voltage dividing unit or the third voltage dividing unit according to the first output signal and the second output signal;
when the first voltage dividing unit is conducted, the power supply control circuit outputs a first voltage; when the second voltage dividing unit is conducted, the power supply control circuit outputs a second voltage; when the third voltage dividing unit is conducted, the power supply control circuit outputs a third voltage.
9. An electronic device comprising the power supply control circuit according to any one of claims 1 to 7.
10. A storage medium having stored thereon a computer program which, when executed by a processor, causes the processor to perform the power control method of claim 8.
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| CN202310076444.2A CN115940626B (en) | 2023-02-08 | 2023-02-08 | Power supply control circuit, power supply control method, electronic equipment and storage medium |
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