CN112467983A - Control circuit based on buck-boost synchronous regulator - Google Patents
Control circuit based on buck-boost synchronous regulator Download PDFInfo
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- CN112467983A CN112467983A CN202011488008.9A CN202011488008A CN112467983A CN 112467983 A CN112467983 A CN 112467983A CN 202011488008 A CN202011488008 A CN 202011488008A CN 112467983 A CN112467983 A CN 112467983A
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control circuit based on a buck-boost synchronous regulator, wherein the control circuit of the buck-boost synchronous regulator comprises: the synchronous driving circuit comprises an output voltage sampling circuit, an inductive current sampling circuit, a first PI regulator circuit, a second PI regulator circuit, a triangular wave generator, a Boost carrier generation circuit, a first comparator, a second comparator, a third comparator, a fourth comparator, a resistor of RC filtering, a first capacitor, a first divider resistor R3, a second divider resistor R4, a first voltage division reference circuit, a second voltage division reference circuit, an inverter, a Buck driving circuit, a Boost driving circuit, a Buck current-continuing tube synchronous driving circuit and a Boost isolation diode synchronous driving circuit. The control circuit of the buck-boost synchronous regulator disclosed by the invention can realize stable and reliable control of synchronous driving of the buck-boost synchronous regulator among the boost mode, the buck mode and the direct connection mode, and can ensure that the conversion efficiency of the regulator is maximally improved.
Description
Technical Field
The invention belongs to the technical field of energy management of space power supply systems, and particularly relates to a control circuit based on a buck-boost synchronous regulator.
Background
As a core component of a space power supply controller, a space power supply system mainly has the task of providing a high-quality, high-efficiency, stable and reliable continuous power supply for a spacecraft during an on-orbit period, and meeting the power requirement of the spacecraft in working and running.
The space power supply subsystem is an important component of a spacecraft platform, and the development level of the space power supply subsystem plays a key role in improving the performance and prolonging the service life of the spacecraft. With the optimization of functions and performances of the spacecraft and the expansion of load capacity, higher requirements are put forward on the configuration of a power supply system of the spacecraft. The spacecraft platform with large load needs to solve the high-efficiency energy conversion technology and the power regulation technology facing space protection, not only needs to realize high-power output, but also puts higher requirements on the topological structure of the power regulator and the control strategy thereof in order to improve the system stability and the energy efficiency.
Because the spacecraft is influenced by the operation orbit in the space flight process, the working voltage and current of the solar cell array change greatly along with the change of the environmental temperature and the illumination intensity, and the voltage-reducing and voltage-boosting regulator with the voltage-reducing and voltage-boosting regulation mode is convenient for realizing high-power conversion in a wide input voltage range.
The conversion efficiency of the Buck-boost regulator is obviously improved, but the topology has the defects that a boost isolation diode and a Buck fly-wheel diode in a Buck mode generate large loss in high-power conversion, so that the efficiency of the regulator is reduced.
In order to further improve the efficiency of the regulator, the original control strategy is improved, namely, the boost isolation diode and the fly-wheel diode are synchronously driven and controlled in a Buck mode in the working state of the DC/DC circuit, so that the loss can be effectively reduced, and the efficiency of the regulator is improved. How to realize stable and reliable control of synchronous driving of a Boost isolation diode and a freewheeling diode by adopting a hardware mode based on a Buck/Boost circuit is an urgent problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the technical problem of stable and reliable control of synchronous driving of a Boost isolation diode and a freewheeling diode of a Buck/Boost regulator is solved by adopting a hardware mode.
In order to solve the technical problem, the invention discloses a control circuit based on a buck-boost synchronous regulator, wherein the control circuit based on the buck-boost synchronous regulator is arranged between the buck-boost synchronous regulator and a load; the control circuit based on the buck-boost synchronous regulator comprises: the device comprises an output voltage sampling circuit, an inductive current sampling circuit, a first PI regulator circuit, a second PI regulator circuit, a triangular wave generator, a Boost carrier generation circuit, a first comparator, a second comparator, a third comparator, a fourth comparator, a resistor of RC filter, a first capacitor, a first divider resistor R3, a second divider resistor R4, a first voltage division reference circuit, a second voltage division reference circuit, a phase inverter, a Buck drive circuit, a Boost drive circuit, a Buck follow current tube synchronous drive circuit and a Boost isolation diode synchronous drive circuit;
the output ends of the Buck driving circuit, the Boost driving circuit, the Buck follow current tube synchronous driving circuit and the Boost isolating diode synchronous driving circuit are respectively connected with the Buck-Boost synchronous regulator;
the input ends of the inductive current sampling circuit and the output voltage sampling circuit are respectively connected with the output end of the buck-boost synchronous regulator; the output end of the inductive current sampling circuit is connected with the input end of the second PI regulator circuit, the output end of the output voltage sampling circuit is connected with the input end of the first PI regulator circuit, and the first voltage division reference circuit, the first PI regulator circuit and the second PI regulator circuit are sequentially connected;
the triangular wave generator is connected with the Boost carrier wave generating circuit;
the first comparator, the second comparator and the third comparator are connected in parallel, and the output end of the second PI regulator circuit is connected to a path between the first comparator and the second comparator;
the output end of the first comparator is connected with the input end of the Boost driving circuit, the output end of the second comparator is respectively connected with the input ends of the Buck driving circuit and the Buck follow current tube synchronous driving circuit, and the phase inverter is connected between the output end of the second comparator and the input end of the Buck follow current tube synchronous driving circuit;
the positive input end of the third comparator is connected with the second voltage division reference circuit, and the output end of the third comparator, the resistor of the RC filter and the positive input end of the fourth comparator are sequentially connected; the first capacitor is connected with the resistor of the RC filter in parallel;
the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4 are connected in parallel to the negative-stage input end of the fourth comparator; and the output end of the fourth comparator is connected with the input end of the Boost isolation diode synchronous driving circuit.
Optionally, an input end of the buck-boost synchronous regulator is connected to an output end of the solar cell array, and an output end of the buck-boost synchronous regulator is connected to the storage battery pack and the load.
Optionally, the buck-boost synchronous regulator comprises: the first switch tube, the second switch tube, the third switch tube and the fourth switch tube control the synchronous buck-boost regulator to switch the working modes by adjusting the states of the switch tubes.
Optionally, when the first switching tube is in an on state, the second switching tube is in a modulation state, and the third switching tube and the fourth switching tube are in an off state, the buck-boost synchronous regulator is in a boost mode;
the first switching tube is in a modulation state, the second switching tube is in a closing state, the third switching tube is in a switching-on state, and the buck-boost synchronous regulator is in a buck mode when the fourth switching tube is in the modulation state;
the first switch tube is in an on state, the second switch tube is in an off state, the third switch tube is in an on state, and when the fourth switch tube is in an off state, the buck-boost synchronous regulator is in a direct connection mode.
Optionally, the buck-boost synchronous regulator operates in a boost mode when the input voltage is less than the output voltage and the difference between the voltages is greater than 0.5V.
Optionally, when the input voltage is greater than the output voltage and the difference between the voltages is greater than 0.5V, the buck-boost synchronous regulator operates in a buck mode;
optionally, when the input voltage is greater than or less than the output voltage and the difference between the voltages is less than or equal to 0.5V, the buck-boost synchronous regulator operates in the direct connection mode.
The invention has the following advantages:
the control circuit based on the buck-boost synchronous regulator disclosed by the embodiment of the invention realizes stable and reliable control of synchronous driving of the buck-boost synchronous regulator among the boost mode, the buck mode and the direct connection mode by using a hardware circuit mode, and can ensure that the conversion efficiency of the regulator is maximally improved.
Drawings
Fig. 1 is a block diagram of a primary energy conversion system of a space power supply according to an embodiment of the invention;
fig. 2 is a topology structure diagram of a buck-boost synchronous regulator according to an embodiment of the present invention;
FIG. 3 is a control circuit based on a buck-boost synchronous regulator according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a single-modulation-dual-carrier PWM control waveform according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and with reference to the attached drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a block diagram of a primary energy conversion system of a space power supply, and as shown in fig. 1, the primary energy conversion system of the space power supply mainly comprises a solar cell array, a buck-boost synchronous regulator, a control circuit, a storage battery pack, a load and the like. The input end of the voltage boosting and reducing synchronous regulator is connected with the output end of the solar cell array, and the output end of the voltage boosting and reducing synchronous regulator is connected with the storage battery pack and the load.
In the illumination period, when the load power is lower, the solar cell array supplies power to the load and charges the storage battery pack; when the load power is larger or the output power of the solar cell array is insufficient, the solar cell array and the storage battery pack jointly supply power to the load. During the shadow period, the battery pack alone supplies power to the load.
Fig. 2 is a topology structure diagram of a buck-boost synchronous regulator, and as shown in fig. 2, the buck-boost synchronous regulator includes: the first switch tube, the second switch tube, the third switch tube and the fourth switch tube control the buck-boost synchronous regulator to switch the working modes by regulating the states of the switch tubes. For the synchronous regulator of the step-up and step-down voltage
The buck-boost synchronous regulator has three working modes:
when the first switching tube Q1 is in an on state, the second switching tube Q2 is in a modulation state, and the third switching tube Q3 and the fourth switching tube Q4 are in an off state, the buck-boost synchronous regulator is in a boost mode;
when the first switching tube Q1 is in a modulation state, the second switching tube Q2 is in a closing state, the third switching tube Q3 is in a switching-on state, and the fourth switching tube Q4 is in a modulation state, the buck-boost synchronous regulator is in a buck mode;
when the first switching tube Q1 is in an on state, the second switching tube Q2 is in an off state, the third switching tube Q3 is in an on state, and the fourth switching tube Q4 is in an off state, the buck-boost synchronous regulator is in a direct connection mode.
Fig. 3 is a control circuit based on a buck-boost synchronous regulator, and as shown in fig. 3, the control circuit based on the buck-boost synchronous regulator includes: the synchronous driving circuit comprises an output voltage sampling circuit, an inductive current sampling circuit, a first PI regulator circuit, namely a PI regulator circuit 1, a second PI regulator circuit, namely a PI regulator circuit 2, a triangular wave generator, a Boost carrier generation circuit, a first comparator, namely COM1, a second comparator, namely COM2, a third comparator, namely COM3, a fourth comparator, namely COM3, a resistor R1 for RC filtering, a first capacitor C1, a first voltage-dividing resistor R3, a second voltage-dividing resistor R4, a first voltage-dividing reference circuit, namely a voltage-dividing reference circuit 1, a second voltage-dividing reference circuit, namely a voltage-dividing reference circuit 2, an inverter AI, a Buck driving circuit, a Boost driving circuit, a Buck current-continuing tube synchronous driving circuit and a Boost isolation diode synchronous driving circuit.
The output ends of the Buck driving circuit, the Boost driving circuit, the Buck follow current tube synchronous driving circuit and the Boost isolating diode synchronous driving circuit are respectively connected with a Buck-Boost synchronous regulator;
the input ends of the inductive current sampling circuit and the output voltage sampling circuit are respectively connected with the output end of the buck-boost synchronous regulator; the output end of the inductive current sampling circuit is connected with the input end of the second PI regulator circuit, the output end of the output voltage sampling circuit is connected with the input end of the first PI regulator circuit, and the first voltage division reference circuit, the first PI regulator circuit and the second PI regulator circuit are sequentially connected; the triangular wave generator is connected with the Boost carrier wave generating circuit.
The first comparator, the second comparator and the third comparator are connected in parallel, and the output end of the second PI regulator circuit is connected to a path between the first comparator and the second comparator; the output end of the first comparator is connected with the input end of the Boost driving circuit, the output end of the second comparator is respectively connected with the Buck driving circuit and the input end of the Buck follow current tube synchronous driving circuit, and a phase inverter is connected between the output end of the second comparator and the input end of the Buck follow current tube synchronous driving circuit;
the positive input end of the third comparator is connected with the second voltage division reference circuit, and the output end of the third comparator, the resistor for RC filtering and the positive input end of the fourth comparator are sequentially connected; the first capacitor is connected in parallel with the resistor of the RC filter; the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4 are connected in parallel to the negative-stage input end of the fourth comparator; and the output end of the fourth comparator is connected with the input end of the Boost isolation diode synchronous driving circuit.
In fig. 3, in order to prevent a single-point failure or unstable circuit operation and ensure stable operation of the regulator, the synchronous control signal of the Boost isolation diode adopts a second-order comparison mode, the output of the first-order comparator is compared with half of the amplitude of the control electric power supply after being filtered by the RC (the values of R3 and R4 are equal), the synchronous tube of the isolation diode is prevented from being interfered and misconducted in the Boost operating mode, and the synchronous control reliability and stability of the Boost isolation diode are increased; meanwhile, a 1uF ceramic capacitor C1 is added between GS pins of the synchronous tubes of the Boost isolation diodes, so that the phenomenon that the driving voltage of the synchronous tubes is influenced by voltage spikes of reverse recovery of the isolation diodes in the Boost working mode, the synchronous tubes are conducted by mistake, and the working stability of the system is influenced is prevented.
As shown in fig. 4, a dead zone is added between the Buck carrier and the Boost carrier of the Buck/Boost dual carrier to realize smooth switching between Buck/Boost working modes, and at this time, the working state of the Buck-Boost synchronous regulator is in a direct connection mode. The direct connection mode voltage interval is set to be an upper 0.5V interval and a lower 0.5V interval of bus voltage according to circuit parameters, and belongs to a Bang-Bang control mode with good robustness.
When the input voltage is less than the output voltage and the voltage difference is greater than 0.5V, the voltage boosting and reducing synchronous regulator works in a voltage boosting mode, and the specific steps are as follows:
step 1: the difference value of the reference voltage Vo _ ref and the bus voltage sample V 'o enters the PI regulator 1 to calculate an output current loop reference and an inductor current sample I'LThe difference value enters a PI regulator 2 to calculate and output a modulation wave Vcomp to intercept with the double carriers.
Step 2: the modulation wave Vcomp is intercepted with the trig2 carrier wave, at the moment, the comparator COM1 outputs a PWM waveform with a corresponding duty ratio, the Boost driving circuit outputs a PWM waveform with a certain duty ratio, and the Boost switching tube Q2 is in a modulation state; the comparator COM2 outputs high level, the Buck drive circuit outputs PWM signal as high level, and Buck switch tube Q1 is in on state.
And step 3: the phase inverter outputs low level, the Buck follow current tube synchronous driving circuit outputs low level driving signals, and the Buck follow current synchronous tube Q4 is in an off state.
And 4, step 4: the modulation wave Vcomp is compared with a reference voltage Vb _ ref, the comparator COM3 and the comparator COM4 output low level, the Boost isolation diode synchronous driving circuit outputs a driving signal with low level, and the synchronous tube Q3 is in a turn-off state.
When the input voltage is greater than the output voltage and the voltage difference is greater than 0.5V, the buck-boost synchronous regulator works in a buck mode, and the method specifically comprises the following steps:
step 1: the difference value of the reference voltage Vo _ ref and the bus voltage sample V 'o enters the PI regulator 1 to calculate an output current loop reference and an inductor current sample I'LThe difference value enters a PI regulator 2 to calculate and output a modulation wave Vcomp to intercept with the double carriers.
Step 2: the modulation wave Vcomp is intercepted with the trig1 carrier wave, at the moment, the comparator COM2 outputs a PWM waveform with a corresponding duty ratio, the Buck driving circuit outputs a PWM waveform with a certain duty ratio, and the Buck switching tube Q1 is in a modulation state; the comparator COM1 outputs the low level, and the Boost drive circuit outputs the PWM signal for the low level, and the Boost switch tube Q2 is in the on-state.
And step 3: the inverter outputs a PWM waveform inverted with the comparator COM2, the Buck freewheeling tube synchronous driving circuit outputs a corresponding PWM driving signal, and the Buck freewheeling synchronous tube Q4 is in a modulation state.
And 4, step 4: the modulation wave Vcomp is compared with a reference voltage Vb _ ref, the comparator COM3 and the comparator COM4 output high level, the Boost isolation diode synchronous driving circuit outputs a high level driving signal, and the synchronous tube Q3 is in an on state.
When the input voltage is greater than or less than the output voltage and the voltage difference is less than or equal to 0.5V, the buck-boost synchronous regulator works in a direct connection mode, and the specific steps are as follows:
step 1: the difference value of the reference voltage Vo _ ref and the bus voltage sample V 'o enters the PI regulator 1 to calculate an output current loop reference and an inductor current sample I'LThe difference value enters a PI regulator 2 to calculate and output a modulation wave Vcomp to intercept with the double carriers.
Step 2: the amplitude of the modulation wave Vcomp is between a Boost carrier and a Buck carrier, at the moment, a comparator COM1 outputs a low-level signal, a Boost driving circuit outputs a PWM signal which is at a low level, and a Boost switching tube Q2 is in a closed state; the comparator COM2 outputs high level, the Buck drive circuit outputs PWM signal as high level, and Buck switch tube Q1 is in on state.
And step 3: the inverter outputs a low level signal which is inverted with the comparator COM2, the Buck follow current tube synchronous driving circuit outputs a PWM signal which is low level, and the Buck follow current synchronous tube Q4 is in a closed state.
And 4, step 4: the modulation wave Vcomp is compared with a reference voltage Vb _ ref, the comparator COM3 and the comparator COM4 output high level, the Boost isolation diode synchronous driving circuit outputs a high level driving signal, and the synchronous tube Q3 is in an on state.
The control circuit based on the buck-boost synchronous regulator disclosed by the embodiment of the invention realizes stable and reliable control of synchronous driving of the buck-boost synchronous regulator among the boost mode, the buck mode and the direct connection mode by using a hardware circuit mode, and can ensure that the conversion efficiency of the regulator is maximally improved.
It should be noted that the above description is only a preferred embodiment of the present invention, and it should be understood that various changes and modifications can be made by those skilled in the art without departing from the technical idea of the present invention, and these changes and modifications are included in the protection scope of the present invention.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (7)
1. A control circuit based on a buck-boost synchronous regulator is characterized by comprising: the device comprises an output voltage sampling circuit, an inductive current sampling circuit, a first PI regulator circuit, a second PI regulator circuit, a triangular wave generator, a Boost carrier generation circuit, a first comparator, a second comparator, a third comparator, a fourth comparator, a resistor of RC filter, a first capacitor, a first divider resistor R3, a second divider resistor R4, a first voltage division reference circuit, a second voltage division reference circuit, a phase inverter, a Buck drive circuit, a Boost drive circuit, a Buck follow current tube synchronous drive circuit and a Boost isolation diode synchronous drive circuit;
the output ends of the Buck driving circuit, the Boost driving circuit, the Buck follow current tube synchronous driving circuit and the Boost isolating diode synchronous driving circuit are respectively connected with the Buck-Boost synchronous regulator;
the input ends of the inductive current sampling circuit and the output voltage sampling circuit are respectively connected with the output end of the buck-boost synchronous regulator; the output end of the inductive current sampling circuit is connected with the input end of the second PI regulator circuit, the output end of the output voltage sampling circuit is connected with the input end of the first PI regulator circuit, and the first voltage division reference circuit, the first PI regulator circuit and the second PI regulator circuit are sequentially connected;
the triangular wave generator is connected with the Boost carrier wave generating circuit;
the first comparator, the second comparator and the third comparator are connected in parallel, and the output end of the second PI regulator circuit is connected to a path between the first comparator and the second comparator;
the output end of the first comparator is connected with the input end of the Boost driving circuit, the output end of the second comparator is respectively connected with the input ends of the Buck driving circuit and the Buck follow current tube synchronous driving circuit, and the phase inverter is connected between the output end of the second comparator and the input end of the Buck follow current tube synchronous driving circuit;
the positive input end of the third comparator is connected with the second voltage division reference circuit, and the output end of the third comparator, the resistor of the RC filter and the positive input end of the fourth comparator are sequentially connected; the first capacitor is connected with the resistor of the RC filter in parallel;
the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4 are connected in parallel to the negative-stage input end of the fourth comparator; and the output end of the fourth comparator is connected with the input end of the Boost isolation diode synchronous driving circuit.
2. The control circuit of claim 1, wherein an input end of the buck-boost synchronous regulator is connected with an output end of the solar cell array, and an output end of the buck-boost synchronous regulator is connected with the storage battery pack and the load.
3. The control circuit of claim 1, wherein the buck-boost synchronous regulator comprises: the first switch tube, the second switch tube, the third switch tube and the fourth switch tube control the synchronous buck-boost regulator to switch the working modes by adjusting the states of the switch tubes.
4. The control circuit of claim 1, wherein:
the first switching tube is in an on state, the second switching tube is in a modulation state, and the buck-boost synchronous regulator is in a boost mode when the third switching tube and the fourth switching tube are in an off state;
the first switching tube is in a modulation state, the second switching tube is in a closing state, the third switching tube is in a switching-on state, and the buck-boost synchronous regulator is in a buck mode when the fourth switching tube is in the modulation state;
the first switch tube is in an on state, the second switch tube is in an off state, the third switch tube is in an on state, and when the fourth switch tube is in an off state, the buck-boost synchronous regulator is in a direct connection mode.
5. The control circuit of claim 4, wherein: when the input voltage is smaller than the output voltage and the voltage difference is larger than 0.5V, the buck-boost synchronous regulator works in a boost mode.
6. The control circuit of claim 4, wherein: when the input voltage is larger than the output voltage and the voltage difference is larger than 0.5V, the buck-boost synchronous regulator works in a buck mode.
7. The control circuit of claim 4, wherein the buck-boost synchronous regulator operates in a direct-connect mode when the input voltage is greater than or less than the output voltage and the difference between the voltages is less than or equal to 0.5V.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023213292A1 (en) * | 2022-05-06 | 2023-11-09 | 长春捷翼汽车科技股份有限公司 | Combined control voltage converter, control method, power supply, and new energy vehicle |
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| US20140354250A1 (en) * | 2013-05-28 | 2014-12-04 | Chengdu Monolithic Power Systems Co., Ltd. | High efficient control circuit for buck-boost converters and control method thereof |
| CN103326566A (en) * | 2013-06-30 | 2013-09-25 | 南京集能易新能源技术有限公司 | Four-switch boost and step down DC converter and control method thereof |
| CN106452074A (en) * | 2015-08-07 | 2017-02-22 | 联发科技股份有限公司 | Buck-boost converter and method for controlling buck-boost converter |
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| CN107612333A (en) * | 2017-10-25 | 2018-01-19 | 上海空间电源研究所 | A kind of control circuit and method based on two-tube buck-boost converter |
| US20190131876A1 (en) * | 2017-10-30 | 2019-05-02 | Renesas Electronics America Inc. | Window comparator structure for low power hysteretic buck-boost dc-dc controller |
| US20200169172A1 (en) * | 2017-10-30 | 2020-05-28 | Renesas Electronics America Inc. | Window comparator structure for low power hysteretic buck-boost dc-dc controller |
| CN111092549A (en) * | 2019-11-27 | 2020-05-01 | 南京航空航天大学 | Three-mode frequency conversion soft switching control method of four-tube Buck-Boost converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023213292A1 (en) * | 2022-05-06 | 2023-11-09 | 长春捷翼汽车科技股份有限公司 | Combined control voltage converter, control method, power supply, and new energy vehicle |
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