CN112968611B - Control circuit and switching power supply using same - Google Patents
Control circuit and switching power supply using same Download PDFInfo
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- CN112968611B CN112968611B CN202110302813.6A CN202110302813A CN112968611B CN 112968611 B CN112968611 B CN 112968611B CN 202110302813 A CN202110302813 A CN 202110302813A CN 112968611 B CN112968611 B CN 112968611B
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application discloses a control circuit and a switching power supply using the same. According to the technical scheme of the embodiment of the invention, the first controller is used for directly transmitting the driving signal of the first power tube, and meanwhile, the second controller is used for transmitting the on control signal and the off control signal to drive the second power tube according to the control signal generated by the first controller, so that half-bridge control is effectively realized, the number of peripheral devices is reduced, and the integration level is improved.
Description
Technical Field
The invention relates to the power electronic technology, in particular to a switching converter and a control circuit thereof.
Background
The wide application of the switching power supply in the field of power electronics promotes the rapid development of various driving chips. The switching power supply includes a switching circuit, such as a half-bridge circuit, and a driver chip turns on and off in an alternating sequence by driving a high-side switch and a low-side switch in the half-bridge circuit to obtain a controlled output voltage. In the half-bridge circuit in the prior art, one driving chip is usually adopted to realize the driving control of the high-side switch and the low-side switch, and for the isolated switching power supply, the driving chip needs to add an auxiliary winding to realize the control of the switch so as to obtain the required output voltage. However, in such a driving chip, a separate driving chip requires more peripheral devices, which is not favorable for system integration, and thus the application environment is limited.
Disclosure of Invention
In view of this, embodiments of the present invention provide a switching power supply and a control circuit thereof, in which a first controller and a second controller respectively drive a first power transistor and a second power transistor, so as to effectively implement half-bridge control, reduce the number of peripheral devices, and improve the integration level.
According to a first aspect of embodiments of the present invention, there is provided a control circuit for a switching power supply, the switching power supply comprising at least one half-bridge, the half-bridge comprising a first power transistor and a second power transistor coupled in series between an input voltage and a reference ground of the switching power supply.
The control circuit includes:
the input end of the first controller receives a feedback signal, a first driving signal is generated at a first output end according to the feedback signal so as to drive the first power tube, and a control signal is generated at a second output end; and
and the input end of the second controller receives the control signal, generates a switching-on control signal and a switching-off control signal according to the control signal, and generates a second driving signal at the output end according to the switching-on control signal and the switching-off control signal so as to drive the second power tube.
Preferably, the reference ground of the first controller is coupled to a common node of the first power tube and the second power tube, and the reference ground of the second controller is coupled to the reference ground of the switching power supply.
Preferably, the first controller is integrated in a first control chip to generate the first driving signal, and the second controller is integrated in a second control chip to generate the second driving signal; the reference ground potential of the second control wafer is the same as the reference ground of the switching power supply.
Preferably, the reference ground of the first control chip is coupled to a common node of the first power tube and the second power tube.
Preferably, the first controller and the second controller are packaged in one chip to drive the first power tube and the second power tube, wherein the first controller and the second controller have different reference ground potentials.
Preferably, the first controller and the first power tube are packaged in a first chip, the second controller and the second power tube are packaged in a second chip, and the first chip and the second chip have different reference ground potentials.
Preferably, the control signal switches between a first voltage and a voltage at a common node of the first power tube and the second power tube; when the control signal is connected to the first voltage, the turn-off control signal is effective to control the second power tube to turn off; when the control signal is connected to a common node of the first power tube and the second power tube, the switching-on control signal is effective to control the second power tube to be switched on.
Preferably, the second controller comprises a turn-on circuit configured to detect a falling edge of the control signal to generate the turn-on control signal;
preferably, the second controller includes a shutdown circuit configured to generate the shutdown control signal according to a voltage value of the control signal.
Preferably, the turn-on circuit includes:
a capacitor having a first terminal coupled to the control signal; and
and the input end of the pulse signal detection circuit is coupled to the second end of the capacitor so as to generate the switching-on control signal at the output end.
Preferably, the shutdown circuit includes:
a current source;
a resistor connected in series with the current source between a first voltage and a reference ground of the switching power supply to generate a sampling voltage at a common connection node; and
a comparator generating the turn-off control signal by comparing the sampling voltage with a reference voltage.
Preferably, the first controller includes:
the control signal generating circuit generates a PWM control signal according to the feedback signal;
and the first driving circuit generates the first driving signal according to the PWM control signal to drive the first power tube.
Preferably, the first controller further comprises a signal transfer circuit configured to generate the control signal according to the PWM control signal.
Preferably, the signal transfer circuit includes:
a first switch coupled between a first voltage and the control signal; and
a second switch coupled between a common node of the first and second power transistors and the control signal; wherein the first switch and the second switch are controlled by the PWM control signal.
According to a second aspect of embodiments of the present invention, there is provided a switching power supply, comprising:
at least one half bridge comprising a first power tube and a second power tube connected in series between an input voltage and a reference ground; and
the control circuit of any one of the first aspect.
According to the technical scheme of the embodiment of the invention, the first controller is used for directly transmitting the driving signal of the first power tube, and meanwhile, the second controller is used for transmitting the on control signal and the off control signal to drive the second power tube according to the control signal generated by the first controller, so that half-bridge control is effectively realized, the number of peripheral devices is reduced, and the integration level is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of a switching power supply of a first embodiment of the present invention;
fig. 2 is a circuit diagram showing a switching power supply of a second embodiment of the present invention;
FIG. 3 is a circuit diagram of a second controller of an embodiment of the present invention;
fig. 4 is a waveform diagram illustrating operation of the switching power supply according to the embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that, in the following description, the "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 is a circuit diagram of a switching power supply of a first embodiment of the present invention. As shown in fig. 1, the switching power supply according to the embodiment of the present invention is described by taking a resonant converter as an example. The resonant converter 1 comprises a switching circuit 10, which switching circuit 10 comprises at least one half-bridge comprising a first power transistor Q1 and a second power transistor Q2 between the input voltage Vin and the ground reference GND of the switching power supply. The switching circuit 10 is used to drive the resonant circuit 12. The resonant circuit 12 includes an inductor LR connected in series to a common connection point HB of the power tubes Q1 and Q2, another inductor Lp, and a resonant capacitor CR. The inductor Lp is coupled to a transformer 13 having a center-tapped secondary. The transformer 13 includes secondary windings NS1 and NS2, the secondary windings NS1 and NS2 are connected to the anodes of diodes D1 and D2, respectively, and the cathodes of diodes D1 and D2 are both connected to a parallel circuit of an output capacitor Cout and an output resistor Rout. The output voltage Vout of the resonant converter 1 is located across the parallel circuit through which an output current Iout flows.
The control circuit 100 includes a first controller 101 and a second controller 102. The switching circuit 10 is driven by the first controller 101 and the second controller 102 to generate a periodic square wave voltage V HB . The input terminal of the first controller 101 receives the feedback signal FB, generates a first driving signal HG at a first output terminal to drive the first power transistor Q1 to be periodically turned on and off according to the feedback signal FB, and generates a control signal LX at a second output terminal to be transmitted to the second controller 102. First, theThe input terminal of the two-controller 102 receives the control signal LX, and generates a second driving signal LG at the output terminal according to the control signal LX to drive the second power transistor Q2 to turn on and off periodically. The second controller 102 generates an on control signal and an off control signal according to the control signal LX, and generates a driving signal LG according to the on control signal to control the second power transistor Q2 to be turned on, and generates a driving signal LG according to the off control signal to control the second power transistor Q2 to be turned off. In this embodiment, the ground reference of the first controller 101 is connected to the common node HB of the first power transistor Q1 and the second power transistor Q2, and the ground reference of the second controller 102 is connected to the ground reference GND of the switching power supply, so that the driving signals of the first power transistor Q1 and the second power transistor Q2 can be isolated, thereby simplifying the circuit structure and saving the cost.
In this embodiment, the first controller 101 is integrated into a first control chip to generate the first driving signal HG, and the second controller 102 is integrated into a second control chip to generate the second driving signal LG, wherein the reference ground of the second control chip is the same as the reference ground of the switching power supply, and the reference ground of the first control chip is connected to the common node HB of the first power transistor Q1 and the second power transistor Q2.
In this embodiment, the second controller 102 generates the on control signal by detecting a falling edge of the control signal LX, and generates the off control signal by detecting the magnitude of the control signal LX. In a preferred embodiment, the control signal LX switches between a first voltage VCC and a voltage at a common node of the first power transistor and the second power transistor. When the control signal LX is coupled to the first voltage VCC, the second controller 102 generates an active turn-off control signal to control the second power transistor Q2 to turn off. When the control signal LX is coupled to the common node HB, the second controller 102 generates an active turn-on control signal to control the second power transistor Q2 to turn on.
In this embodiment, the feedback signal FB may represent different sampling parameters, such as an output current, an output voltage, an output power, and the like representing the switching power supply, according to a control manner adopted by the switching power supply.
Compared with the prior art, the technical scheme of the embodiment of the invention directly transmits the driving signal of the first power tube through the first controller, and transmits the on control signal and the off control signal to the second controller according to the control signal generated by the first controller to drive the second power tube, so that the half-bridge control is effectively realized, the number of peripheral devices is reduced, and the integration level is improved.
In a packaged application, the first controller 101 and the second controller 102 are packaged together to form a control chip to drive the first power transistor Q1 and the second power transistor Q2, and the first controller 101 and the second controller 102 have different ground potentials. In another package application, the first controller 101 and the first power transistor Q1 are packaged together to form one chip, and the second controller 102 and the second power transistor Q2 are packaged together to form another chip, wherein the two chips have different ground reference potentials to meet different application requirements.
Fig. 2 is a circuit diagram of a switching power supply according to a second embodiment of the present invention. The first controller 101 includes a control circuit 20a and a first driving circuit 20 b. The control circuit 20a is configured to generate a PWM control signal in accordance with the feedback signal FB. The first driving circuit 20b is configured to generate a first driving signal HG to drive the first power transistor Q1 to be turned on and off periodically according to the PWM control signal.
Further, the first controller 10 further includes a signal transfer circuit. The signal transfer circuit includes a first switch S1 and a second switch S2. The first drive circuit 20b is configured to generate signals GS1 and GS2 according to the PWM control signal. The signals GS1 and GS2 are used to control the first switch S1 and the second switch S2 to turn on and off, respectively. The first switch S1 is connected between the first voltage VCC and the control signal LX, and the second switch S2 is connected between the control signal LX and the common node HB. The signals GS1 and GS2 switch between the first voltage VCC and the voltage on the common node HB by controlling the first switch S1 and the second switch S2 to switch the control signal LX. When the first switch S1 is closed and the second switch S2 is opened, the control signal LX is coupled to the first voltage VCC through the first switch S1, and the second controller 102 generates the active turn-off control signal V2 to control the turn-off of the second power transistor Q2. When the first switch S1 is turned off, the second switch S2 is turned on, the control signal LX is coupled to the common node HB through the second switch S2, and the second controller 102 generates an active turn-on control signal V1 to control the second power transistor Q2 to turn on.
In this embodiment, the control circuit 20a may adopt different control modes to realize loop control, which is not limited to this. For example, when the control circuit 20a adopts the peak current control mode, the control circuit 20a samples the current flowing through the inductor Ls to generate the current sampling signal VS, and generates the PWM control signal according to the current sampling signal VS and the peak current reference value Vc. Wherein the peak current reference value Vc is generated based on an error between the feedback signal FB characterizing the output voltage Vout and the voltage reference signal. The control circuit 20a may also control the on-time of the first power transistor Q1 in a constant on-time control mode. For example, the control circuit 20a generates a feedback error signal based on an error between a feedback signal FB indicative of the output voltage Vout and a voltage reference signal, and generates a PWM control signal based on the feedback error signal and a ramp signal to control the power transistor Q1 to be turned on for a predetermined time per switching period.
The second controller 102 includes a second driving circuit 20c, an on circuit 22, and an off circuit 23. The turn-on circuit 22 receives the control signal LX and generates the turn-on control signal V1 by detecting a falling edge of the control signal LX. The second driving circuit 20c controls the second power transistor Q2 to be turned on according to the on control signal V1. The shutdown circuit 23 receives the control signal LX and generates a shutdown control signal V2 according to the magnitude of the control signal LX. The second driving circuit 20c controls the second power transistor Q2 to turn off according to the turn-off control signal V2.
Fig. 3 is a circuit diagram of a second controller of an embodiment of the present invention. The second controller 102 includes a second drive circuit 20c, a turn-on circuit 22, and a turn-off circuit 23. The turn-on circuit 22 includes a capacitor C and a pulse detection circuit 30. The first terminal of the capacitor C is connected to the control signal LX, and the second terminal thereof is connected to the input terminal of the pulse detection circuit. The pulse detection circuit 30 detects a falling edge of the control signal LX by detecting a falling edge of the voltage Vp at the second terminal of the capacitor C, and generates the turn-on control signal V1.
The turn-off circuit 23 comprises a current source S3,resistor R and comparator a 0. A current source S3 and a resistor R are connected in series between the control signal LX and the reference ground of the switching power supply and generate at their common connection a sampled voltage V representing the magnitude of the control signal LX SEN . A first input (e.g., a non-inverting input) of the comparator a0 receives the sampled voltage V SEN A second input terminal (e.g., an inverting input terminal) for receiving a reference voltage Vth, and comparing the sampled voltage V SEN And the reference voltage Vth generates the off control signal V2. The second driving circuit 20c controls the second power transistor Q2 to turn on and off according to the on control signal V1 and the off control signal V2, respectively.
Fig. 4 is a waveform diagram of the operation of the switching power supply according to the embodiment of the present invention. In the present embodiment, the switching power supply is described by taking the resonant converter in fig. 1 as an example. At time t0, the PWM control signal is switched to active high level, and the first driving circuit 20b controls the first driving signal HG to be switched to high level at time t1 through a predetermined dead time, so as to control the first power transistor Q1 to be turned on. At the same time, the first driving circuit 20b controls the switch S1 to be turned on, the switch S2 to be turned off, and the control signal LX is connected to the first voltage VCC, so that the voltage difference LX-V between the two ends of the switch S2 HB Switching to high, the voltage Vp at the second terminal of the capacitor C generates a rising pulse.
During the time t1-t2, the first power tube Q1 is in a conducting state, and the resonant current I flowing through the inductor LR LR And the change is in a downward trend. The current source S3 generates a predetermined current due to the control signal LX connected to the first voltage VCC, thereby sampling the voltage V SEN Above the reference voltage Vth, the comparator a0 generates an active turn-off control signal V2, thereby controlling the second power transistor Q2 to turn off.
At time t3, the control signal PWM is switched to a low level, and the first driving circuit 20b controls the first driving signal HG to be switched to a low level, so as to control the first power transistor Q1 to turn off. While the first driving circuit 20b controls the switch S1 to be turned off, the switch S2 to be turned on, and the control signal LX to be connected to the common node HB, so that the voltage difference LX-V between both ends of the switch S2 HB Switching to low, the voltage Vp at the second terminal of the capacitor C generates a falling pulse. The turn-on circuit 22 generates an effective turn-on control signal V2 according to the voltage VpThe second driving circuit 20c controls the second driving signal LG to be switched to a high level at time t3 through a predetermined dead time so as to control the second power transistor Q2 to be conducted. Since the control signal LX is connected to the common node HB, the voltage V on the common node HB HB Close to zero, current source S3 does not generate current, thereby sampling voltage V SEN Less than the reference voltage Vth, the comparator a0 generates an inactive turn-off control signal V2 to maintain the second power transistor Q2 turned on.
During the time t3-t4, the second power tube Q2 is in a conducting state, and the resonant current I LR Showing a rising trend. At time t4, the control signal PWM is switched to active high, the first driving circuit 20b controls the switch S1 to be turned on, the switch S2 to be turned off, the control signal LX is connected to the first voltage VCC, and the current source S3 generates a predetermined current, thereby sampling the voltage V SEN Above the reference voltage Vth, the comparator a0 generates an active turn-off control signal V2 to control the second power transistor Q2 to turn off. With this cycle, the switching power supply is in a stable operating state, and generates a stable output voltage Vout.
The technical scheme of the embodiment of the invention directly transmits the driving signal of the first power tube through the first controller, and simultaneously transmits the on-control signal and the off-control signal to the second controller according to the control signal generated by the first controller so as to drive the second power tube, thereby effectively realizing half-bridge control, reducing the number of peripheral devices and improving the integration level
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A control circuit for driving a switching power supply, the switching power supply including at least one half-bridge, the half-bridge including a first power transistor and a second power transistor coupled in series between an input voltage and a ground reference of the switching power supply, the control circuit comprising:
the input end of the first controller receives a feedback signal, a first driving signal is generated at a first output end according to the feedback signal so as to drive the first power tube, and a control signal is generated at a second output end; and
and the input end of the second controller receives the control signal, generates an on control signal and an off control signal according to the control signal, and generates a second driving signal at the output end to drive the second power tube according to the on control signal and the off control signal, wherein the second controller comprises an on circuit which is configured to detect the falling edge of the control signal to generate the on control signal.
2. The control circuit of claim 1, wherein the reference ground of the first controller is coupled to a common node of the first power transistor and the second power transistor, and wherein the reference ground of the second controller is coupled to a reference ground of the switching power supply.
3. The control circuit of claim 1, wherein the first controller is integrated into a first control die to generate the first driving signal, and the second controller is integrated into a second control die to generate the second driving signal; the reference ground potential of the second control wafer is the same as the reference ground of the switching power supply.
4. The control circuit of claim 3, wherein the reference ground of the first control die is coupled to a common node of the first and second power transistors.
5. The control circuit of claim 1, wherein the first controller and the second controller are packaged in one chip to drive the first power transistor and the second power transistor, wherein the first controller and the second controller have different ground reference potentials.
6. The control circuit of claim 1, wherein the first controller and the first power transistor are packaged in a first chip, and wherein the second controller and the second power transistor are packaged in a second chip, the first chip and the second chip having different reference ground potentials.
7. The control circuit of claim 1, wherein the control signal switches between a first voltage and a voltage at a common node of the first and second power transistors; when the control signal is connected to the first voltage, the turn-off control signal is effective to control the second power tube to turn off; when the control signal is connected to a common node of the first power tube and the second power tube, the switching-on control signal is effective to control the second power tube to be switched on.
8. The control circuit of claim 1, wherein the second controller comprises a shutdown circuit configured to generate the shutdown control signal according to a voltage value of the control signal.
9. The control circuit of claim 1, wherein the turn-on circuit comprises:
a capacitor having a first terminal coupled to the control signal; and
and the input end of the pulse signal detection circuit is coupled to the second end of the capacitor so as to generate the switching-on control signal at the output end.
10. The control circuit of claim 8, wherein the shutdown circuit comprises:
a current source;
a resistor connected in series with the current source between a first voltage and a reference ground of the switching power supply to generate a sampling voltage at a common connection node; and
a comparator generating the turn-off control signal by comparing the sampling voltage with a reference voltage.
11. The control circuit of claim 1, wherein the first controller comprises:
the control signal generating circuit generates a PWM control signal according to the feedback signal;
and the first driving circuit generates the first driving signal according to the PWM control signal to drive the first power tube.
12. The control circuit of claim 11, wherein the first controller further comprises a signal transfer circuit configured to generate the control signal according to the PWM control signal.
13. The control circuit of claim 12, wherein the signal passing circuit comprises:
a first switch coupled between a first voltage and the control signal; and
a second switch coupled between a common node of the first and second power transistors and the control signal;
wherein the first switch and the second switch are controlled by the PWM control signal.
14. A switching power supply, comprising:
at least one half bridge comprising a first power tube and a second power tube connected in series between an input voltage and a reference ground; and
a control circuit as claimed in any one of claims 1 to 13.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296894A (en) * | 2013-05-21 | 2013-09-11 | 辉芒微电子（深圳）有限公司 | Controllable constant-current output circuit |
| CN108768146A (en) * | 2018-06-22 | 2018-11-06 | 矽力杰半导体技术(杭州)有限公司 | Power inverter and its control circuit and control method |
| CN110401334A (en) * | 2019-08-29 | 2019-11-01 | 河北新华北集成电路有限公司 | Timesharing electrical control circuit and high-voltage drive |
| US10581319B1 (en) * | 2019-03-15 | 2020-03-03 | National Taiwan University | Resonant converter with magnetic-flux balance control circuit |
| CN111628658A (en) * | 2020-07-07 | 2020-09-04 | 杭州士兰微电子股份有限公司 | Power converter and control circuit and control method thereof |
| CN112271927A (en) * | 2020-10-16 | 2021-01-26 | 杭州必易微电子有限公司 | Control circuit and control method of synchronous rectifier tube and flyback voltage conversion circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105644426B (en) * | 2015-12-25 | 2018-02-23 | 上海沪工汽车电器有限公司 | A kind of automobile using ceiling light control module |
| US10116297B1 (en) * | 2017-06-19 | 2018-10-30 | Psemi Corporation | DC-coupled high-voltage level shifter |
-
2021
- 2021-03-22 CN CN202110302813.6A patent/CN112968611B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296894A (en) * | 2013-05-21 | 2013-09-11 | 辉芒微电子（深圳）有限公司 | Controllable constant-current output circuit |
| CN108768146A (en) * | 2018-06-22 | 2018-11-06 | 矽力杰半导体技术(杭州)有限公司 | Power inverter and its control circuit and control method |
| US10581319B1 (en) * | 2019-03-15 | 2020-03-03 | National Taiwan University | Resonant converter with magnetic-flux balance control circuit |
| CN110401334A (en) * | 2019-08-29 | 2019-11-01 | 河北新华北集成电路有限公司 | Timesharing electrical control circuit and high-voltage drive |
| CN111628658A (en) * | 2020-07-07 | 2020-09-04 | 杭州士兰微电子股份有限公司 | Power converter and control circuit and control method thereof |
| CN112271927A (en) * | 2020-10-16 | 2021-01-26 | 杭州必易微电子有限公司 | Control circuit and control method of synchronous rectifier tube and flyback voltage conversion circuit |
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