CN113193747A - Switch tube boosting module - Google Patents
Switch tube boosting module Download PDFInfo
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- CN113193747A CN113193747A CN202010035512.7A CN202010035512A CN113193747A CN 113193747 A CN113193747 A CN 113193747A CN 202010035512 A CN202010035512 A CN 202010035512A CN 113193747 A CN113193747 A CN 113193747A
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- resistor
- switching tube
- switch tube
- comparator
- oscillator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1563—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators without using an external clock
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- Engineering & Computer Science (AREA)
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- Dc-Dc Converters (AREA)
Abstract
The invention relates to a switching tube boosting module which comprises a switching tube, an inductor, a first capacitor, a rectifier diode, a feedback network, a feedback control module and an oscillator, wherein the feedback network comprises a first resistor and at least two second resistors, one end of the first resistor is connected with the positive electrode of the first capacitor, the other end of the first resistor is respectively connected with the second resistors through a lead, the feedback control module comprises a comparator, the negative input end of the comparator is connected with a reference voltage Vref, the positive input end of the comparator is connected with the connection end FB of the first resistor and the second resistor through a lead, the output end of the comparator is connected with the input end of the oscillator through a lead, and the output end of the oscillator is connected with the grid electrode of the switching tube. The switching tube boosting module is high in conversion efficiency, large in driving capacity and provided with a plurality of dynamically-switchable output high voltages.
Description
Technical Field
The invention relates to a boosting module, in particular to a switching tube boosting module.
Background
The switching tube booster circuit is a common circuit module in the field of integrated circuits, and controls an inductor to store and release energy through the conduction and the disconnection of a switching tube, so that the output voltage is higher than the input voltage. In order to provide a load with a large power under a low power supply voltage, a switching tube boost converter circuit is usually integrated in the class of circuits to convert a low input voltage into one or more high output voltages.
The main indexes for measuring the boost circuit of the switching tube comprise conversion efficiency and driving capability. The conversion efficiency and the driving capability of the existing switching tube booster circuit are low, meanwhile, the existing switching tube booster circuit only generates single output high voltage generally, and many application occasions adopting the switching tube booster circuit generally want to aim at a certain fixed input voltage, the switching tube booster circuit can generate a plurality of output high voltages, namely, the boosted voltage is variable, and different output voltages are dynamically converted instead of being manually controlled manually.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a switching tube boost module with high conversion efficiency, large driving capability, and a plurality of switching tubes capable of dynamically converting and outputting high voltage.
The invention relates to a switching tube boosting module, which comprises a switching tube, an inductor, a first capacitor and a rectifier diode, wherein the drain electrode of the switching tube is connected with input voltage through the first capacitor, the drain electrode of the switching tube is also connected with the anode of the rectifier diode through a lead, the cathode of the rectifier diode is connected with the anode of the first capacitor through a lead, the source electrode of the switching tube and the cathode of the first capacitor are connected with the ground, the switching tube boosting module also comprises a feedback network, a feedback control module and an oscillator, the feedback network comprises a first resistor and at least two second resistors, one end of the first resistor is connected with the anode of the first capacitor, the other end of the first resistor is respectively connected with the second resistors through leads, the feedback control module comprises a comparator, the negative input end of the comparator is connected with reference voltage Vref, the positive input end of the comparator is connected with FB (FB) of the first resistor and the second resistor through leads, the output end of the comparator is connected with the input end of the oscillator through a lead, and the output end of the oscillator is connected with the grid electrode of the switching tube.
Furthermore, in the switching tube boost module of the invention, the number of the second resistors is three.
Further, in the switching tube boost module of the present invention, a third resistor and a second capacitor C2 connected in series are further disposed between the first capacitor and the connection terminal FB.
By the scheme, the invention at least has the following advantages: according to the switching tube boosting module, the circuit can be dynamically switched to a plurality of different output voltages by the arrangement of the feedback network; the unique design improves the performance of the whole chip using the boosting module, for example, the boosting module is applied to a D-type power amplifier chip, and for different audio power, the switching tube boosting module can rapidly switch a plurality of different voltages so as to optimize the power supply voltage of the amplifier and improve the efficiency of the whole system. When the audio power requirement is low, the output voltage can be set to be low so as to reduce the static current consumption; and as the audio power demand increases, the output voltage can be set high to increase the delivery of audio power to the speaker. In addition, the switching tube boosting module controls the conduction time of the switching tube by adopting the oscillator with the adjustable duty ratio, and improves the driving capability of the boosting circuit by combining the selection of the channel length parameter of the switching tube; meanwhile, the switching tube boosting module can select a continuous working mode and a discontinuous working mode according to the size of a load to be driven, so that the overall energy conversion efficiency of the switching tube boosting module is improved; the switching tube boosting module adopts circuit structures such as a simplified oscillator, a feedback control module and the like, so that the power consumption of the whole boosting circuit is reduced; in addition, the power consumption of the switching tube can be reduced by reducing the on-resistance of the switching tube, so that the overall conversion efficiency of the booster circuit is improved.
In summary, the switching tube boost module of the present invention has high conversion efficiency, large driving capability, and multiple dynamically-switchable output high voltages.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a prior art switching tube boost circuit configuration;
FIG. 2 is a structural schematic of the switching tube boost module of the present invention;
FIG. 3 is a structure of an oscillator according to the present invention;
fig. 4 is a structure of a feedback control module in the present invention.
In the figure, the switch tube is 1; the inductance is 2; the first capacitance is 3; the rectifier diode is 4; the feedback network is 5; the feedback control module is 6; the oscillator is 7; the first resistance is 8; the second resistance is 9; the comparator is 10; the third resistance is 11; the second capacitance C2 is 12.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, a switching tube boost module according to a preferred embodiment of the present invention includes a switching tube 1, an inductor 2, a first capacitor 3, and a rectifying diode 4, a drain of the switching tube is connected to an input voltage through the first capacitor, a drain of the switching tube is further connected to an anode of the rectifying diode through a wire, a cathode of the rectifying diode is connected to an anode of the first capacitor through a wire, a source of the switching tube and a cathode of the first capacitor are connected to ground, the switching tube boost module further includes a feedback network 5, a feedback control module 6, and an oscillator 7, the feedback network includes a first resistor 8 and at least two second resistors 9, one end of the first resistor is connected to the anode of the first capacitor, the other end of the first resistor is respectively connected to the second resistors through wires, the feedback control module includes a comparator 10, a negative input end of the comparator is connected to a reference voltage Vref, a positive input end of the comparator is connected to a connection end FB of the first resistor and the second resistor through a wire, the output end of the comparator is connected with the input end of the oscillator through a lead, and the output end of the oscillator is connected with the grid electrode of the switching tube.
When the switching tube is conducted under the action of a control signal OSC output by the oscillator, the input current IIN flows into the inductor L1, and power supply energy is stored in the inductor L1 in a magnetic energy mode; after the OSC switches off the switching tube, the magnetic energy is converted into electric energy again due to the self-induction of the inductor, and is reflected in the SW terminal, i.e., the drain of the switching tube, in a voltage manner, the rectifier diode D1 is turned on and supplies a current ID to the load, which is a process of converting the electric energy into the magnetic energy and then converting the magnetic energy into the electric energy. In addition, the feedback network of the circuit enables the circuit to be dynamically switched to a plurality of different output voltages.
The oscillator is based on a hysteresis comparator and has adjustable frequency and duty ratio, the structure is very simple, an oscillation signal OSC generated by the oscillator controls the on and off of the SW end of the switch tube, and the specific structure and the working principle are as follows:
in fig. 3, switches S1, S2, S3, S4 are controlled by the output of the hysteretic comparator, where S1 and S2 are in phase, S3 and S4 are in phase, and the two sets of switches are in anti-phase. When the switches S1, S2 are open, S3, S4 are closed, the current I flowing through the capacitor C1 is positive, and the positive and negative voltages of the positive charging of C1 are defined as shown. The two ends of the capacitor C1 are connected to the two input ends of the hysteresis comparator, and when the voltage difference of the capacitor C1 reaches the forward flip voltage threshold value of the hysteresis comparator, the output end of the comparator is reversed. When the switches S1, S2 are closed, S3 and S4 are opened, the current I flowing through C1 is reversed, C1 starts to charge reversely, and when the reverse voltage of C1 reaches the negative flip threshold of the hysteresis comparator, the output end of the comparator is reversed again, and the oscillation signal is generated in cycles.
It can be seen that the frequency of the oscillating signal is related to the capacitance value and the charging current, while oscillating signals of different duty cycles can be generated if the current of the current source is different at different phases of the switch.
The following are the concrete structure and the working principle of the feedback control module:
the feedback control module controls the charging and discharging current of the oscillator by comparing the voltage of the FB end with the internal reference voltage, when the voltage of the FB is lower than the internal reference voltage Vref, the oscillator works in a continuous mode, the oscillation frequency is highest, meanwhile, the duty ratio of the oscillation signal is maximum, at the moment, the booster circuit charges the capacitor with the maximum efficiency, when the voltage of the FB gradually approaches the internal reference voltage Vref, the frequency of the oscillator is reduced, meanwhile, the duty ratio of the oscillation signal is reduced, the output efficiency is reduced, and at the moment, the booster circuit works in a discontinuous mode.
The output voltage end VOUT of the booster circuit is connected to the FB end through two resistors R1 and R2 which are connected in parallel, wherein a capacitor C2 is connected in series with the R2 resistor; and FB is connected to VRG1, VRG2 and VRG3 ends through 3 resistors R3, R4 and R5, namely a second resistor, the three ports can be grounded or suspended, and the specific state of the three ports is determined by an external selection end.
The output voltage value of the switching tube boosting module can be represented by the following formula:
wherein R345 is the resistance value of one of the three resistors R3, R4 and R5 which is connected to the ground; therefore, the output voltage value VOUT of the booster circuit is determined by the reference voltage Vref of the circuit and the voltage dividing resistor connected to the FB terminal.
Assuming that the reference voltage Vref of the circuit is 1.25V, R1 is 24K Ω, and R3, R4 and R5 are 4K Ω, 6K Ω and 8K Ω, respectively, the output voltage VOUT is 8.75V when R3 is grounded and R4 and R5 are suspended; when R4 is grounded and R3 and R5 are suspended, the output voltage VOUT is 6.25V; r5 is grounded, and when R3 and R4 are suspended, the output voltage VOUT is 5V; i.e. different boost values can be obtained by different resistor connections.
The current IOUT that the switching tube boost module can provide can be represented by the following equation:
In the above expression, TON is the on-time of the switching tube M1; the RON switch tube is connected with a resistor; l is the inductance value of L1; RL is the DC resistance of L1; VD is the conduction voltage drop of the diode D1; VOUT is output voltage; VIN is the input voltage.
The expression shows that the maximum driving current of the circuit is related to factors such as inductance, switch tube on-resistance, switch tube on-time and the like of external devices of the circuit; and by removing an external device, for the circuit, under the condition that the duty ratio of the oscillator is determined, the on-resistance of the switching tube determines the maximum power supply current of the circuit.
Preferably, the number of the second resistors is three.
Preferably, a third resistor 11 and a second capacitor C212 connected in series are further provided between the first capacitor and the connection terminal FB.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description.
In addition, the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, 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. Also, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. The utility model provides a switch tube boost module, includes switch tube (1), inductance (2), first electric capacity (3) and rectifier diode (4), the drain electrode of switch tube passes through input voltage is connected to first electric capacity, and the drain electrode of switch tube still passes through the wire and connects rectifier diode's positive pole, rectifier diode's negative pole pass through the wire with first electric capacity's positive pole is connected, and switch tube's source electrode and first electric capacity's negative pole are connected with ground, its characterized in that: the switch tube voltage boosting module further comprises a feedback network (5), a feedback control module (6) and an oscillator (7), wherein the feedback network comprises a first resistor (8) and at least two second resistors (9), one end of the first resistor is connected with the positive pole of the first capacitor, the other end of the first resistor is connected with the second resistors through a wire, the feedback control module comprises a comparator (10), the negative input end of the comparator is connected with a reference voltage Vref, the positive input end of the comparator is connected with the connection end FB of the first resistor and the second resistors through a wire, the output end of the comparator is connected with the input end of the oscillator through a wire, and the output end of the oscillator is connected with the grid electrode of the switch tube.
2. The switch tube boost module of claim 1, wherein: the number of the second resistors is three.
3. The switch tube boost module of claim 1, wherein: and a third resistor (11) and a second capacitor C2(12) which are connected in series are further arranged between the first capacitor and the connection end FB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035512.7A CN113193747A (en) | 2020-01-14 | 2020-01-14 | Switch tube boosting module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035512.7A CN113193747A (en) | 2020-01-14 | 2020-01-14 | Switch tube boosting module |
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| Publication Number | Publication Date |
|---|---|
| CN113193747A true CN113193747A (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010035512.7A Pending CN113193747A (en) | 2020-01-14 | 2020-01-14 | Switch tube boosting module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115955222A (en) * | 2023-03-13 | 2023-04-11 | 迈思普电子股份有限公司 | Drive control circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394608A (en) * | 2011-09-28 | 2012-03-28 | 上海复旦微电子集团股份有限公司 | Oscillator circuit |
| CN202975965U (en) * | 2012-12-30 | 2013-06-05 | 深圳市显控自动化技术有限公司 | Direct current voltage converting circuit |
| CN203434863U (en) * | 2013-07-03 | 2014-02-12 | 西安Tcl软件开发有限公司 | Power supply circuit and power supply having same power supply circuit |
| CN207664875U (en) * | 2018-01-16 | 2018-07-27 | 四川安迪科技实业有限公司 | A kind of LNB polarization power supplies power-supplying circuit |
-
2020
- 2020-01-14 CN CN202010035512.7A patent/CN113193747A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394608A (en) * | 2011-09-28 | 2012-03-28 | 上海复旦微电子集团股份有限公司 | Oscillator circuit |
| CN202975965U (en) * | 2012-12-30 | 2013-06-05 | 深圳市显控自动化技术有限公司 | Direct current voltage converting circuit |
| CN203434863U (en) * | 2013-07-03 | 2014-02-12 | 西安Tcl软件开发有限公司 | Power supply circuit and power supply having same power supply circuit |
| CN207664875U (en) * | 2018-01-16 | 2018-07-27 | 四川安迪科技实业有限公司 | A kind of LNB polarization power supplies power-supplying circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115955222A (en) * | 2023-03-13 | 2023-04-11 | 迈思普电子股份有限公司 | Drive control circuit |
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Application publication date: 20210730 |
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