CN110798325A - Power supply circuit capable of automatically adjusting power supply voltage - Google Patents
Power supply circuit capable of automatically adjusting power supply voltage Download PDFInfo
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- CN110798325A CN110798325A CN201910998849.5A CN201910998849A CN110798325A CN 110798325 A CN110798325 A CN 110798325A CN 201910998849 A CN201910998849 A CN 201910998849A CN 110798325 A CN110798325 A CN 110798325A
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Abstract
The invention discloses a power supply circuit capable of automatically adjusting power supply voltage, which comprises a control module, a first power supply module, a first switch module, N level conversion modules, N second power supply modules with different output voltages, N second switch modules and a power supply port, wherein the control module is used for controlling the power supply voltage to be supplied to the power supply circuit; the level conversion module, the second power supply module and the second switch module are in one-to-one correspondence; the control module is used for generating a corresponding control signal according to the real-time temperature of the powered device; the level conversion module is used for controlling the corresponding second switch module to be switched on and off according to the control signal; the first power supply module is used for providing a first power supply voltage for the powered device through the power supply port when the first switch module is switched on; the second power supply module is configured to provide a second power supply voltage to the powered device through the power supply port when the corresponding second switch module is turned on. The invention can adjust the power supply voltage according to the real-time temperature of the equipment so as to adapt to the temperature requirement of the equipment and simultaneously reduce the influence on the performance of the equipment as much as possible.
Description
Technical Field
The invention relates to the technical field of wireless communication and power supply, in particular to a power supply circuit capable of automatically adjusting power supply voltage.
Background
Small wireless devices generally suffer from the problem of high temperature or even exceeding the standard, which causes the reliability and service life of the devices to be reduced, the user experience to be poor, one of the reasons for the high temperature of the devices is that a high-power amplifier (PA for short) is used on a radio frequency link, the efficiency of the PA is low, most of the power is consumed in heat dissipation, which causes the temperature of the PA and the devices to be increased, the efficiency of the PA is related to the supply voltage, for example, a PA supporting 3.3V to 5V supply, the supply voltage is reduced from 5V to 3.3V, and under the condition of transmitting the same power, the current change is basically small, therefore, the power consumption of the PA is approximately linearly reduced along with the reduction of the voltage, the efficiency of the PA is improved, however, the supply voltage drop may cause the linearity of the PA to be poor, and the EVM index to be poor under the same power condition, which may cause the performance of the device to be poor or even not satisfactory.
Because the EVM indexes required by different wireless rate modes are different, the EVM index requirement in the high rate mode is strictest, the lower the rate mode is, the lower the corresponding EVM index requirement is, generally, the transmission power in the low rate mode of the wireless device can be made higher, and the transmission power in the high rate mode is limited by the lower EVM index requirement, so the temperature rise of the device is limited by the transmission power in the low rate mode, and the influence of reducing the supply voltage of the PA on the index in the low rate mode is small, so if the PA is applied to the high supply voltage when working in the high rate mode, the device performance can be best; device temperature can be greatly improved if the PA is applied to a low supply voltage when operating in the low rate mode.
However, in the design of the current wireless device, the PA is powered by only one power supply, and the power supply voltage is fixed, so that the power supply voltage cannot be adjusted in real time to balance the device performance and the temperature rise.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a power supply circuit capable of automatically adjusting a power supply voltage, so as to adjust the power supply voltage according to a real-time temperature of a device, so as to meet a temperature requirement of the device, and reduce an influence on a performance of the device as much as possible.
In order to solve the above technical problem, an embodiment of the present invention provides a power supply circuit for automatically adjusting a power supply voltage, including a control module, a first power supply module, a first switch module, N level conversion modules, N second power supply modules with different output voltages, N second switch modules, and a power supply port; wherein N > 0; the first power supply module is connected with the power supply port through the first switch module; the level conversion module, the second power supply module and the second switch module are in one-to-one correspondence; the second power supply module is connected with the power supply port through the second switch module; the control module is connected with the control end of the second switch module through the level conversion module;
the control module is used for generating a corresponding control signal according to the real-time temperature of the powered device;
the level conversion module is used for controlling the on and off of the corresponding second switch module according to the control signal;
the first switch module is used for controlling the connection and disconnection of a power supply path between the first power supply module and the power supply port according to the connection and disconnection of the second switch module;
the first power supply module is configured to provide a first power supply voltage to the powered device through the power supply port when the first switch module is turned on;
the second power supply module is configured to provide a second power supply voltage to the powered device through the power supply port when the corresponding second switch module is turned on.
Further, the control module is specifically configured to:
when the real-time temperature of the powered device is smaller than a preset temperature threshold, generating a corresponding first control signal;
when the real-time temperature of the powered device is not less than a preset temperature threshold, generating a corresponding second control signal;
then, the level shift module is specifically configured to:
controlling the corresponding second switch module to be conducted according to the first control signal;
and controlling the corresponding second switch module to be switched off according to the second control signal.
Further, the output voltage of the first power supply module is smaller than that of any one of the second power supply modules, and the first switch module comprises a diode;
the anode of the diode is connected with the output end of the first power supply module, and the cathode of the diode is connected with the power supply port.
Further, the diode is a schottky diode.
Further, the level conversion module comprises a first switch tube and a first resistor;
the control end of the first switch tube is connected with the output end of the control module, the first end of the first switch tube is connected with the control end of the second switch module, the first end of the first switch tube is connected with the output end of the second power supply module through the first resistor, and the second end of the first switch tube is grounded.
Further, the first switching tube is an NPN-type triode; the control end of the first switching tube is a base electrode of an NPN type triode, the first end of the first switching tube is a collector electrode of the NPN type triode, and the second end of the first switching tube is an emitting electrode of the NPN type triode.
Further, the first switch tube is an N-channel MOS tube; the control end of the first switch tube is a grid electrode of an N-channel MOS tube, the first end of the first switch tube is a drain electrode of the N-channel MOS tube, and the second end of the first switch tube is a source electrode of the N-channel MOS tube.
Further, the second switch module comprises a second switch tube;
the control end of the second switch tube is connected with the output end of the corresponding level conversion module, the first end of the second switch tube is connected with the output end of the corresponding second power supply module, and the second end of the second switch tube is connected with the power supply port.
Further, the second switch tube is a PNP type triode; the control end of the second switch tube is a base electrode of the PNP type triode, the first end of the second switch tube is an emitting electrode of the PNP type triode, and the second end of the second switch tube is a collecting electrode of the PNP type triode.
Further, the second switch tube is a P-channel MOS tube; the control end of the second switch tube is a grid electrode of a P-channel MOS tube, the first end of the second switch tube is a source electrode of the P-channel MOS tube, and the second end of the second switch tube is a drain electrode of the P-channel MOS tube.
Compared with the prior art, the embodiment of the invention provides a power supply circuit capable of automatically adjusting power supply voltage, which comprises a control module, a first power supply module, a first switch module, N level conversion modules, N second power supply modules with different output voltages, N second switch modules and a power supply port, wherein the control module generates a corresponding control signal according to the real-time temperature of a powered device, the level conversion modules control the on and off of the corresponding second switch modules according to the control signal, the first switch module controls the on and off of a power supply path between the first power supply module and the power supply port according to the on and off of the second switch modules, the first power supply module provides a first power supply voltage to the powered device through the power supply port when the first switch module is turned on, the second power supply module provides a second power supply voltage to the powered device through the power supply port when the corresponding second switch module is turned on, therefore, the power supply voltage can be automatically adjusted according to the real-time temperature of the equipment so as to adapt to the temperature requirement of the equipment, and meanwhile, the influence on the performance of the equipment is reduced as much as possible, so that the balance between the performance and the temperature rise of the equipment is realized.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a power supply circuit for automatically adjusting a supply voltage according to the present invention;
fig. 2 is a schematic structural diagram of another preferred embodiment of the power supply circuit for automatically adjusting the power supply voltage according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The embodiment of the present invention provides a power supply circuit for automatically adjusting a power supply voltage, which is shown in fig. 1 and is a schematic structural diagram of a preferred embodiment of the power supply circuit for automatically adjusting a power supply voltage, where the power supply circuit includes a control module, a first power supply module, a first switch module, N level conversion modules, N second power supply modules with different output voltages, N second switch modules, and a power supply port; wherein N > 0; the first power supply module is connected with the power supply port through the first switch module; the level conversion module, the second power supply module and the second switch module are in one-to-one correspondence; the second power supply module is connected with the power supply port through the second switch module; the control module is connected with the control end of the second switch module through the level conversion module;
the control module is used for generating a corresponding control signal according to the real-time temperature of the powered device;
the level conversion module is used for controlling the on and off of the corresponding second switch module according to the control signal;
the first switch module is used for controlling the connection and disconnection of a power supply path between the first power supply module and the power supply port according to the connection and disconnection of the second switch module;
the first power supply module is configured to provide a first power supply voltage to the powered device through the power supply port when the first switch module is turned on;
the second power supply module is configured to provide a second power supply voltage to the powered device through the power supply port when the corresponding second switch module is turned on.
Specifically, the output end of the first power supply module is connected with the first end of the first switch module, the second end of the first switch module is connected with the power supply port, the output end of the control module is connected with the input end of each level conversion module, the output end of each level conversion module is connected with the control end of the corresponding second switch module, the output end of each second power supply module is connected with the first end of the corresponding second switch module, and the second end of each second switch module is connected with the power supply port; the control module generates a corresponding control signal according to the real-time temperature of the powered device and transmits the control signal to each level conversion module, the level conversion module controls the connection and disconnection of the second switch modules correspondingly connected according to the received control signal, the first switch module controls the connection and disconnection of a power supply path between the first power supply module and the power supply port according to the connection and disconnection of each second switch module, the first power supply module provides first power supply voltage for the powered device through the power supply port when the first switch module is connected, and each second power supply module provides second power supply voltage for the powered device through the power supply port when the second switch module correspondingly connected is connected.
Wherein, the real-time temperature of the powered device can be detected by a temperature sensor, the temperature sensor can be a separately arranged temperature sensor or a temperature sensor integrated in chips such as a CPU of the powered device according to the application requirement of the powered device, so as to detect the temperature of a device or a module to be monitored in the powered device in real time, the control module obtains the real-time temperature of the powered device detected by the temperature sensor and generates a corresponding control signal according to the real-time temperature, the control signal can be a signal sequence of high and low levels to control the on and off of each second switch module respectively through the high and low levels, since the high level of the control signal may not match with the on voltage of the second switch modules, a level conversion module needs to be added between the control module and each second switch module to perform voltage conversion on the control signal output by the control module, the power supply module is used for providing power supply voltage for the powered device when the corresponding connected switch module is switched on, and only one switch module (the first switch module or any one second switch module) is switched on at any time, namely one power supply module provides power supply voltage for the powered device.
It should be noted that the power supply circuit may be disposed inside the powered device, and combined with an internal circuit of the powered device to serve as an internal power supply module of the powered device, in this case, a control module of the power supply circuit may be a CPU or other control module inside the powered device, or may be disposed outside the powered device to serve as an external power supply of the powered device to provide different power supply voltages for the powered device, which is not limited in the embodiment of the present invention.
The power supply circuit capable of automatically adjusting the power supply voltage provided by the embodiment of the invention generates a corresponding control signal according to the real-time temperature of the power receiving equipment through the control module, performs voltage conversion on the control signal through the level conversion module to control the on and off of the corresponding second switch module according to the converted control signal, controls the connection and disconnection of the power supply path between the first power supply module and the power supply port through the first switch module according to the connection and disconnection of the second switch module, so that the first power supply module provides the first power supply voltage to the power receiving equipment through the power supply port when the first switch module is connected, and each second power supply module provides the second power supply voltage to the power receiving equipment through the power supply port when the corresponding second switch module is connected, thereby automatically adjusting the power supply voltage according to the real-time temperature of the equipment to meet the temperature requirement of the equipment, meanwhile, the influence on the performance of the equipment is reduced as much as possible, and the balance between the performance of the equipment and the temperature rise is further realized; in addition, the power supply circuit is simple in structure and low in software control complexity.
As an improvement of the above scheme, the control module is specifically configured to:
when the real-time temperature of the powered device is smaller than a preset temperature threshold, generating a corresponding first control signal;
when the real-time temperature of the powered device is not less than a preset temperature threshold, generating a corresponding second control signal;
then, the level shift module is specifically configured to:
controlling the corresponding second switch module to be conducted according to the first control signal;
controlling the corresponding second switch module to be switched off according to the second control signal,
specifically, with reference to the foregoing embodiment, the control module obtains the real-time temperature of the powered device detected by the temperature sensor, compares the real-time temperature of the powered device with a preset temperature threshold, and when the real-time temperature of the powered device is smaller than the preset temperature threshold, the control module generates a corresponding first control signal and transmits the first control signal to each level conversion module, and the level conversion module performs voltage conversion on the received first control signal to control the conduction of the correspondingly connected second switch module according to the converted first control signal; when the real-time temperature of the powered device is not less than the preset temperature threshold, the control module generates a corresponding second control signal and transmits the second control signal to each level conversion module, and the level conversion module performs voltage conversion on the received second control signal so as to control the second switch module which is correspondingly connected to be turned off according to the converted second control signal.
It can be understood that, for each second switch module, the control actions of the first control signal and the second control signal are opposite, and at any time, the first control signal and the second control signal can control at most one second switch module to be turned on, for example, when the first control signal controls the second switch module 1 to be turned on, the second control signal controls the second switch module 1 to be turned off, meanwhile, the first control signal controls the second switch modules 2 to N to be turned off, the second control signal controls any one of the second switch modules 2 to N to be turned on, or the second control signal controls the second switch modules 2 to N to be turned off, at this time, the first switch module is turned on, and the first power supply module provides the first power supply voltage to the powered device.
Referring to fig. 2, which is a schematic structural diagram of another preferred embodiment of the power supply circuit for automatically adjusting a supply voltage provided by the present invention, the power supply circuit shown in fig. 2 is described by taking only one level shift module, one second switch module, and one second power supply module as an example, that is, only one path of second power supply circuit is included, and the working principles of the other paths of second power supply circuits are the same, and are not described herein again.
In another preferred embodiment, as shown in fig. 2, the output voltage of the first power supply module is smaller than the output voltage of any one of the second power supply modules, and the first switch module includes a diode D1;
the anode of the diode D1 is connected to the output terminal of the first power supply module, and the cathode of the diode D1 is connected to the power supply port.
Specifically, with reference to the foregoing embodiment, if the output voltage of the first power supply module is less than the output voltage of any one of the second power supply modules, that is, the first power supply module is a low-voltage power supply module, and the second power supply module is a high-voltage power supply module, when any one of the high-voltage power supply modules provides a high supply voltage to the powered device, in order to prevent the high-voltage power supply module from sourcing current to the low-voltage power supply module, it is necessary to ensure that the first switch module is turned off under the action of the high-voltage power supply module, in this embodiment, the first switch module is a diode D1, as shown in fig. 2, it is assumed that the second power supply module 1 provides a high supply voltage to the powered device, and at this time, the cathode voltage of the diode D1 is greater than the anode voltage, the diode D1 is in a reverse cut-.
It can be understood that the first switch module may also be a common switch device such as a triode or an MOS transistor, and at this time, the control module may control the on and off of the first switch module, which is not specifically limited in the embodiment of the present invention.
Preferably, the diode is a schottky diode.
In this embodiment, the diode is a schottky diode (SBD), the SBD has the advantages that the conduction voltage drop is smaller than that of a common diode, the voltage loss is small, and the SBD can be replaced by other common diodes according to actual situations.
It should be noted that, since the diode has a certain conduction voltage drop, the conduction voltage drop of the diode needs to be considered for the output voltage of the first power supply module, so as to ensure that the first power supply voltage output from the power supply port can meet the voltage requirement of the powered device.
In another preferred embodiment, as shown in fig. 2, the level shift module includes a first switch Q1 and a first resistor R1;
the control end of the first switch tube Q1 is connected with the output end of the control module, the first end of the first switch tube Q1 is connected with the corresponding control end of the second switch module, the first end of the first switch tube Q1 is further connected with the corresponding output end of the second power supply module through the first resistor R1, and the second end of the first switch tube Q1 is grounded.
Specifically, in combination with the above embodiment, the level shift module is composed of the first switch tube Q1 and the first resistor R1, when the control end of the first switch tube Q1 receives the control signal transmitted by the output end of the control module, the voltage of the control end of the first switch tube Q1 is changed by the high-low level of the control signal, so that the first switch tube Q1 is turned on or off, and further the voltage of the control end of the second switch module is changed, thereby controlling the second switch module to be turned on or off, wherein the first resistor R1 is used to prevent the second power supply module from being directly shorted to the ground when the first switch tube Q1 is turned on.
It should be noted that the level shift module may also be another commonly used OD circuit or a level shift chip, and the embodiment of the present invention is not limited in particular, and when the level shift module employs a level shift chip, the first resistor R1 is not required to be used.
Preferably, the first switching tube Q1 is an NPN-type triode; the control end of the first switch tube Q1 is a base electrode of an NPN-type triode, the first end of the first switch tube Q1 is a collector electrode of the NPN-type triode, and the second end of the first switch tube Q1 is an emitter electrode of the NPN-type triode.
Specifically, with reference to the above embodiment, the first switch Q1 is an NPN transistor, as shown in fig. 2, when the control signal output by the control module is at a high level, the NPN transistor is turned on, the voltage of the control terminal of the second switch module is pulled down to GND, and when the control signal output by the control module is at a low level, the NPN transistor is turned off, and the voltage of the control terminal of the second switch module is pulled up to a high level.
It should be noted that the first switch tube Q1 does not adopt a PNP transistor, because the high level output of the general chip control signal is below 3.3V, at this time, if the voltage of the second power supply module is higher (e.g. 5V), when the PNP transistor is used, the first switch tube Q1 is turned on no matter the control signal outputs the high level or the low level, and does not perform a switching function.
Preferably, the first switching tube Q1 is an N-channel MOS tube; the control end of the first switch tube Q1 is a gate electrode of an N-channel MOS tube, the first end of the first switch tube Q1 is a drain electrode of the N-channel MOS tube, and the second end of the first switch tube Q1 is a source electrode of the N-channel MOS tube.
Specifically, with reference to the above embodiment, the first switch Q1 is an N-channel MOS transistor, and when the control signal output by the control module is at a high level, the N-channel MOS transistor is turned on, the voltage of the control terminal of the second switch module is pulled down to GND, and when the control signal output by the control module is at a low level, the N-channel MOS transistor is turned off, and the voltage of the control terminal of the second switch module is pulled up to a high level.
It should be noted that the reason why the first switching transistor Q1 does not use a P-channel MOS transistor is the same as the reason why the PNP transistor is not used, and the description thereof is omitted here.
In yet another preferred embodiment, shown in conjunction with fig. 2, the second switching module includes a second switching tube Q2;
the control end of the second switch tube Q2 is connected to the corresponding output end of the level shift module, the first end of the second switch tube Q2 is connected to the corresponding output end of the second power supply module, and the second end of the second switch tube Q2 is connected to the power supply port.
Preferably, the second switching tube Q2 is a PNP-type triode; the control end of the second switch tube Q2 is the base electrode of the PNP type triode, the first end of the second switch tube Q2 is the emitting electrode of the PNP type triode, and the second end of the second switch tube Q2 is the collecting electrode of the PNP type triode.
Specifically, with reference to the above embodiment, the second switch Q2 is a PNP transistor, when the voltage of the control terminal of the PNP transistor is pulled down to GND by the first switch Q1, the PNP transistor is turned on, and when the voltage of the control terminal of the PNP transistor is pulled up to high level by the first switch Q1, the PNP transistor is turned off.
Preferably, the second switching tube Q2 is a P-channel MOS tube; the control end of the second switch tube Q2 is a gate of a P-channel MOS tube, the first end of the second switch tube Q2 is a source of the P-channel MOS tube, and the second end of the second switch tube Q2 is a drain of the P-channel MOS tube.
Specifically, in combination with the above embodiment, the second switch Q2 is a P-channel MOS transistor, and as shown in fig. 2, when the voltage at the control terminal of the P-channel MOS transistor is pulled down to GND by the first switch Q1, the P-channel MOS transistor is turned on, and when the voltage at the control terminal of the P-channel MOS transistor is pulled up to a high level by the first switch Q1, the P-channel MOS transistor is turned off.
The following specifically explains the working process of the technical scheme of the embodiment of the present invention, taking the schematic structural diagram provided in fig. 2 as an example:
the first power supply module is a low-voltage power supply module, the second power supply module 1 is a high-voltage power supply module, the default first switching tube Q1(NPN type triode) and the default second switching tube Q2 (P-channel MOS tube) are both in a cut-off state, the diode D1(SBD) is turned on, and the first power supply module provides a first power supply voltage to the powered device.
The control module obtains the real-time temperature of the powered device detected by the temperature sensor, and compares the real-time temperature of the powered device with a preset temperature threshold, when the real-time temperature of the powered device is smaller than the preset temperature threshold, the control module outputs a high-level control signal, the first switching tube Q1 is turned on, the gate voltage of the second switching tube Q2 is pulled down to GND, the second switching tube Q2 is turned on, the second power supply module 1 provides a second power supply voltage to the powered device, at the moment, the cathode voltage of the diode D1 is higher than the anode voltage, the diode D1 is turned off in the reverse direction, and the first power supply module is in an idle state.
When the real-time temperature of the powered device is not less than the preset temperature threshold, the control module outputs a low-level control signal, the first switching tube Q1 is turned off, the gate voltage of the second switching tube Q2 is pulled up to a high level, the second switching tube Q2 is turned off, the second power supply module 2 turns off the power supply to the powered device, the voltage of the power supply port is reduced, when the voltage at the two ends of the diode D1 reaches a positive desired on voltage, the diode D1 is turned on, and the first power supply module restores the power supply to the powered device.
It should be noted that, in the embodiment of the present invention, the first power supply module and the N second power supply modules are commonly used DC-DC circuits, LDO circuits, or other power supply circuits, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A power supply circuit capable of automatically adjusting power supply voltage is characterized by comprising a control module, a first power supply module, a first switch module, N level conversion modules, N second power supply modules with different output voltages, N second switch modules and a power supply port; wherein N > 0; the first power supply module is connected with the power supply port through the first switch module; the level conversion module, the second power supply module and the second switch module are in one-to-one correspondence; the second power supply module is connected with the power supply port through the second switch module; the control module is connected with the control end of the second switch module through the level conversion module;
the control module is used for generating a corresponding control signal according to the real-time temperature of the powered device;
the level conversion module is used for controlling the on and off of the corresponding second switch module according to the control signal;
the first switch module is used for controlling the connection and disconnection of a power supply path between the first power supply module and the power supply port according to the connection and disconnection of the second switch module;
the first power supply module is configured to provide a first power supply voltage to the powered device through the power supply port when the first switch module is turned on;
the second power supply module is configured to provide a second power supply voltage to the powered device through the power supply port when the corresponding second switch module is turned on.
2. The supply circuit for automatically adjusting a supply voltage of claim 1,
the control module is specifically configured to:
when the real-time temperature of the powered device is smaller than a preset temperature threshold, generating a corresponding first control signal;
when the real-time temperature of the powered device is not less than a preset temperature threshold, generating a corresponding second control signal;
then, the level shift module is specifically configured to:
controlling the corresponding second switch module to be conducted according to the first control signal;
and controlling the corresponding second switch module to be switched off according to the second control signal.
3. The power supply circuit for automatically adjusting a supply voltage according to claim 1, wherein an output voltage of the first power supply module is smaller than an output voltage of any one of the second power supply modules, and the first switching module includes a diode;
the anode of the diode is connected with the output end of the first power supply module, and the cathode of the diode is connected with the power supply port.
4. The supply circuit for automatically adjusting a supply voltage as recited in claim 3, wherein the diode is a schottky diode.
5. The power supply circuit for automatically adjusting a power supply voltage according to claim 1, wherein the level shift module comprises a first switch tube and a first resistor;
the control end of the first switch tube is connected with the output end of the control module, the first end of the first switch tube is connected with the control end of the second switch module, the first end of the first switch tube is connected with the output end of the second power supply module through the first resistor, and the second end of the first switch tube is grounded.
6. The power supply circuit for automatically adjusting a power supply voltage according to claim 5, wherein the first switching tube is an NPN-type triode; the control end of the first switching tube is a base electrode of an NPN type triode, the first end of the first switching tube is a collector electrode of the NPN type triode, and the second end of the first switching tube is an emitting electrode of the NPN type triode.
7. The power supply circuit for automatically adjusting a power supply voltage according to claim 5, wherein the first switching transistor is an N-channel MOS transistor; the control end of the first switch tube is a grid electrode of an N-channel MOS tube, the first end of the first switch tube is a drain electrode of the N-channel MOS tube, and the second end of the first switch tube is a source electrode of the N-channel MOS tube.
8. The power supply circuit for automatically adjusting a supply voltage of claim 1, wherein the second switching module comprises a second switching tube;
the control end of the second switch tube is connected with the output end of the corresponding level conversion module, the first end of the second switch tube is connected with the output end of the corresponding second power supply module, and the second end of the second switch tube is connected with the power supply port.
9. The power supply circuit for automatically adjusting a supply voltage according to claim 8, wherein the second switching tube is a PNP type triode; the control end of the second switch tube is a base electrode of the PNP type triode, the first end of the second switch tube is an emitting electrode of the PNP type triode, and the second end of the second switch tube is a collecting electrode of the PNP type triode.
10. The power supply circuit for automatically adjusting a power supply voltage according to claim 8, wherein the second switching transistor is a P-channel MOS transistor; the control end of the second switch tube is a grid electrode of a P-channel MOS tube, the first end of the second switch tube is a source electrode of the P-channel MOS tube, and the second end of the second switch tube is a drain electrode of the P-channel MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910998849.5A CN110798325A (en) | 2019-10-21 | 2019-10-21 | Power supply circuit capable of automatically adjusting power supply voltage |
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| CN113281662A (en) * | 2021-05-18 | 2021-08-20 | 东风柳州汽车有限公司 | Battery state monitoring device and battery pack |
| CN113763898A (en) * | 2021-08-31 | 2021-12-07 | 惠科股份有限公司 | Control circuit, driving method thereof and display device |
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