CN113131753A - Auxiliary power supply system of bidirectional converter and power utilization system - Google Patents
Auxiliary power supply system of bidirectional converter and power utilization system Download PDFInfo
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- CN113131753A CN113131753A CN202110424890.9A CN202110424890A CN113131753A CN 113131753 A CN113131753 A CN 113131753A CN 202110424890 A CN202110424890 A CN 202110424890A CN 113131753 A CN113131753 A CN 113131753A
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- power supply
- auxiliary power
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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
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02M3/33561—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 more than one ouput with independent control
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The embodiment of the invention provides an auxiliary power supply system and an electric system of a bidirectional converter, wherein the auxiliary power supply system comprises: the circuit comprises a startup circuit, a first auxiliary power supply circuit and a combiner selector; the input end of the starting circuit is connected with low-voltage input voltage, the output end of the starting circuit is connected with the first input end of the combination selector, the starting circuit is used for isolating and boosting the low-voltage input voltage, the second input end of the combination selector is connected with bus voltage, the output end of the combination selector is connected with the input end of a first auxiliary power supply circuit, the output end of the first auxiliary power supply circuit is the power supply output end of the auxiliary power supply system, and the first auxiliary power supply circuit is used for isolating and converting the input voltage of the first auxiliary power supply circuit. Compared with the traditional double auxiliary power supplies, the simple startup circuit is used for replacing the complex second auxiliary power supply, so that the auxiliary power supply system of the embodiment of the invention has simple structure and low cost.
Description
Technical Field
The embodiment of the invention relates to the technical field of auxiliary power supplies, in particular to an auxiliary power supply system of a bidirectional converter and an electric system.
Background
The bidirectional converter has the main function of converting alternating current into direct current or converting direct current into alternating current, and the two conversion processes need an auxiliary power supply to provide stable low-voltage power supply for the whole system so as to ensure the normal operation of the system.
In the prior art, two independent auxiliary power supplies are usually designed, when a converter works in AC/DC conversion, the bus voltage is used as the input voltage of the auxiliary power supply, and then the system is supplied with power through transformer isolation; when the converter works in DC/AC conversion, the battery is adopted for supplying power, and a low-voltage input primary power supply system is designed in a matching way for supplying power to the system. Because two independent auxiliary power supplies need to be designed, the structure is complex and the cost is high.
Disclosure of Invention
The embodiment of the invention aims to provide an auxiliary power supply system and an electric system, so that the auxiliary power supply of a bidirectional converter is simple in design and the cost is reduced.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is:
in a first aspect, there is provided an auxiliary power supply system of a bidirectional converter, the auxiliary power supply system comprising: the circuit comprises a startup circuit, a first auxiliary power supply circuit and a combiner selector; the input end of the starting circuit is connected with low-voltage input voltage, the output end of the starting circuit is connected with the first input end of the combination selector, the starting circuit is used for isolating and boosting the low-voltage input voltage, the second input end of the combination selector is connected with bus voltage, the output end of the combination selector is connected with the input end of a first auxiliary power supply circuit, the output end of the first auxiliary power supply circuit is the power supply output end of the auxiliary power supply system, and the first auxiliary power supply circuit is used for isolating and converting the input voltage of the first auxiliary power supply circuit.
In some embodiments, the starting circuit includes a first flyback circuit, an input terminal of the first flyback circuit is connected to the low-voltage input voltage, and an output terminal of the flyback circuit is connected to the first input terminal of the combiner selector.
In some embodiments, the first flyback circuit includes a first isolation transformer, a first diode, a first capacitor, and a first switch tube control circuit, the primary side of the first isolation transformer is connected to the low-voltage input voltage and the first switch tube control circuit, the anode of the first diode is connected to the first end of the secondary side of the first isolation transformer, the cathode of the first diode is connected to the first end of the first capacitor and the first input end of the combiner selector, and the second end of the first capacitor is connected to the second end of the secondary side of the isolation transformer and ground.
In some embodiments, the first switching tube control circuit includes a first control chip and a first switching tube, an output terminal of the first control chip is connected to a gate of the first switching tube, a source of the first switching tube is grounded, and a drain of the first switching tube is connected to the second end of the primary side of the first isolation transformer.
In some embodiments, the first auxiliary power supply circuit includes a second flyback circuit, an input end of the second flyback circuit is connected to the output end of the combiner selector, and an output end of the second flyback circuit is a power supply output end of the auxiliary power supply system and is used for connecting to the control circuit of the bidirectional converter.
In some embodiments, the output of the second flyback circuit is at least one.
In some embodiments, the second flyback circuit includes a second isolation transformer, at least one diode, at least one capacitor, and a second switching tube control circuit, the second isolation transformer including at least one secondary side; the primary side of the second isolation transformer is respectively connected with the output end of the combiner selector and the first switch tube control circuit, each secondary side is connected with a diode and a capacitor, the first end of each secondary side is connected with the anode of the diode, the cathode of the diode is connected with the first end of the capacitor, the second end of the capacitor is connected with the second end of the secondary side, and the first end of the capacitor and the second end of the capacitor are power supply output ends of the auxiliary power supply system.
In some embodiments, the second switching tube control circuit includes a second control chip and a second switching tube, an output terminal of the second control chip is connected to a gate of the second switching tube, a source of the second switching tube is grounded, and a drain of the second switching tube is connected to the second primary side end of the second isolation transformer.
In some embodiments, the low voltage input voltage is a low voltage battery voltage.
In a second aspect, a power utilization system is provided, comprising an auxiliary power system connected to a bidirectional converter for converting alternating current to direct current or direct current to alternating current, and the bidirectional converter.
The beneficial effects of the embodiment of the invention are as follows: the invention is different from the prior art, and provides an auxiliary power supply system and a power utilization system of a bidirectional converter, wherein the auxiliary power supply system comprises an auxiliary power supply circuit and a start circuit, and when the converter works in DC/AC conversion, a complex second auxiliary power supply is replaced by a simple start circuit, so that compared with the traditional technical scheme of double auxiliary power supply, the invention has the advantages of simple structure and low cost.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural diagram of an auxiliary power supply system of a bidirectional converter according to an embodiment of the present invention;
fig. 2 is a block diagram illustrating a start-up circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a first flyback circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a first switch tube control circuit according to an embodiment of the present invention;
FIG. 5 is a block diagram illustrating a first auxiliary power circuit according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a second flyback circuit according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a second switching transistor control circuit according to an embodiment of the present invention;
fig. 8 is a circuit diagram of an auxiliary power supply system according to an embodiment of the invention.
Fig. 9 is a schematic structural block diagram of an electric system according to an embodiment of the present invention;
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Referring to fig. 1, fig. 1 is a schematic structural block diagram of an auxiliary power supply system of a bidirectional converter according to an embodiment of the present invention. The auxiliary power supply system 10 includes a start-up circuit 11, a first auxiliary power supply circuit 12, and a combining selector 13.
The input end of the start circuit 11 is connected with a low-voltage input voltage, the output end of the start circuit 11 is connected with the first input end of the combination selector 13, the start circuit 11 is used for isolating and boosting the low-voltage input voltage, the second input end of the combination selector 13 is connected with a bus voltage, the output end of the combination selector 13 is connected with the input end of the first auxiliary power supply circuit 12, the output end of the first auxiliary power supply circuit 12 is the power supply output end of the auxiliary power supply system 10, and the first auxiliary power supply circuit 12 is used for isolating and converting the input voltage of the first auxiliary power supply circuit 12.
When the bidirectional converter works in AC/DC conversion, the first auxiliary power supply circuit 12 supplies power according to the input of the bus voltage, the power supply range can meet the requirement between 80V and 400V, and then the power is converted into one or more paths of voltage output to supply power to the bidirectional converter; when the system works in DC/AC conversion, if the first auxiliary power supply circuit 12 is powered by only low-voltage input voltage, the first auxiliary power supply circuit 12 cannot work, at this time, a start-up voltage is required to be provided for the first auxiliary power supply circuit 12, the start-up voltage is provided by the start-up circuit 11, the low-voltage input voltage provides a low-voltage input for the start-up circuit 11, the start-up circuit 11 isolates and boosts the low-voltage input and inputs the low-voltage input into the first auxiliary power supply circuit 12, at this time, the first auxiliary power supply circuit 12 starts to work, one or more paths of voltage output are generated after conversion and power is supplied for the bidirectional converter, when the bus voltage rises after power conversion work, at this time, the first auxiliary power supply circuit 12 is powered by the bus voltage, the start-up circuit 11 is clamped and no longer outputs voltage.
The invention provides an auxiliary power supply system of a bidirectional converter, which comprises an auxiliary power supply circuit and a start circuit, wherein when the converter works in DC/AC conversion, a complex second auxiliary power supply is replaced by a simple start circuit, so that compared with the traditional technical scheme of double auxiliary power supply, the auxiliary power supply system has a simple structure and low cost.
In some embodiments, referring to fig. 2, the starting circuit includes a first flyback circuit, an input terminal of the first flyback circuit is connected to the low-voltage input voltage, and an output terminal of the flyback circuit is connected to the first input terminal of the combiner selector. The flyback circuit has the characteristics of simple topology, input and output electrical isolation, wide buck-boost range, automatic balancing of multi-path output load and the like.
In some embodiments, referring to fig. 3, the first flyback circuit includes a first isolation transformer T1, a first diode D1, a first capacitor C1, and a first switch tube control circuit, a primary side of the first isolation transformer T1 is connected to the low-voltage input voltage and the first switch tube control circuit, an anode of the first diode D1 is connected to a first end of a secondary side of the first isolation transformer T1, a cathode of the first diode D1 is connected to a first end of the first capacitor C1 and a first input end of the combiner selector, and a second end of the first capacitor D1 is connected to a second end of the secondary side of the isolation transformer T1 and ground.
In some embodiments, referring to fig. 4, the first switching tube control circuit includes a first control chip and a first switching tube Q1, an output end of the first control chip is connected to a gate of the first switching tube Q1, a source of the first switching tube is grounded, and a drain of the first switching tube is connected to the second primary end of the first isolation transformer.
The operating principle of the first flyback circuit is as follows: the primary winding and the secondary winding of the isolation transformer T1 have opposite polarities, and the first control chip sends a PWM signal to the first switching tube Q1 to control the opening and closing of the first switching tube. When the first switch tube Q1 is turned on, the primary side inductor current of the isolation transformer T1 starts to rise, at this time, due to the relationship of the second dotted terminal, the first diode D1 is cut off, the isolation transformer T1 stores energy, and the first capacitor C1 supplies energy to the first auxiliary power supply circuit after passing through the combiner converter; when the first switch Q1 is turned off, the voltage induced in the primary inductor of the isolation transformer T1 is inverted, and at this time, the diode D1 is turned on, and the energy of the isolation transformer T1 supplies power to the first auxiliary power circuit through the first diode D1, and at the same time, charges the first capacitor C1, thereby supplementing the energy lost when the first switch Q1 is turned off.
In some embodiments, please refer to fig. 5, the first auxiliary power circuit includes a second flyback circuit, an input terminal of the second flyback circuit is connected to the output terminal of the combiner selector, and an output terminal of the second flyback circuit is a power supply output terminal of the auxiliary power system and is used for connecting to the control circuit of the bidirectional converter. In some embodiments, the output of the second flyback circuit is at least one.
In some embodiments, referring to fig. 6, the second flyback circuit includes a second isolation transformer T2, a second diode D2, a third diode D3, a fourth diode D4, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a second switching tube control circuit. The second isolation transformer T2 comprises a primary side and three secondary sides, each secondary side is connected with a diode and a capacitor, the primary side of the second isolation transformer T2 is respectively connected with the output end of the combiner selector and the first switch tube control circuit, the first end of the first secondary side of the second isolation transformer T2 is connected with the anode of the second diode D2, the cathode of the second diode D2 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 is connected with the second end of the first secondary side, and the first end of the second capacitor C2 and the second end of the second capacitor C2 are power supply output ends of the auxiliary power supply system; a first end of a second secondary side of the second isolation transformer T2 is connected with an anode of a third diode D3, a cathode of a third diode D3 is connected with a first end of a third capacitor C3, a second end of the third capacitor C3 is connected with a second end of the first secondary side, and a first end of the third capacitor C3 and a second end of the third capacitor C3 are power supply output ends of the auxiliary power supply system; the first end of the third secondary side of the second isolation transformer T2 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected to the second end of the third secondary side, and the first end of the fourth capacitor C4 and the second end of the fourth capacitor C4 are a power supply output end of the auxiliary power supply system.
In some embodiments, referring to fig. 7, the second switching tube control circuit includes a second control chip and a second switching tube Q2, an output end of the second control chip is connected to a gate of the second switching tube, a source of the second switching tube is grounded, and a drain of the second switching tube is connected to the second primary end of the second isolation transformer.
The operating principle of the second flyback circuit is as follows: the primary winding and the secondary winding of the isolation transformer T2 have opposite polarities, and the second control chip sends a PWM signal to the second switching tube Q2 to control the opening and closing of the second switching tube. When the second switch tube Q2 is turned on, the primary inductor current of the isolation transformer T2 starts to rise, and at this time, due to the relationship of the second dotted terminal, the second diode D2, the third diode D3, and the fourth diode D4 are turned off, the isolation transformer T2 stores energy, and the load is supplied with energy by the second capacitor C2, the third capacitor C3, and the fourth capacitor C4; when the second switch tube Q2 is turned off, the voltage induced in the primary inductor of the isolation transformer T2 is in reverse phase, and at this time, the second diode D2, the third diode D3 and the fourth diode D4 are turned on, and the energy of the isolation transformer T2 supplies power to three loads through the second diode D2, the third diode D3 and the fourth diode D4, and simultaneously charges the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, so as to supplement the energy lost when the second switch tube Q2 is turned off.
In some embodiments, the low-voltage input voltage of the start-up circuit is provided by a low-voltage battery, and in other embodiments, the low-voltage input voltage of the start-up circuit may also be provided by other types of low-voltage output power supplies, which are not limited herein.
In some embodiments, referring to fig. 8, fig. 8 is a circuit diagram of an auxiliary power system. The auxiliary power supply system consists of a startup circuit, a first auxiliary power supply circuit and a combiner. The working principle of the auxiliary power supply system is as follows: when the bidirectional converter works in AC/DC conversion, the first auxiliary power supply supplies power according to the input of bus voltage, when the second switching tube Q2 is switched on, the primary side inductive current of the isolation transformer T2 starts to rise, at the moment, the second diode D2, the third diode D3 and the fourth diode D4 are cut off, the isolation transformer T2 stores energy, and the load is supplied with energy by the second capacitor C2, the third capacitor C3 and the fourth capacitor C4; when the second switch tube Q2 is turned off, the voltage induced in the primary inductor of the isolation transformer T2 is in reverse phase, and at this time, the second diode D2, the third diode D3 and the fourth diode D4 are turned on, and the energy of the isolation transformer T2 supplies power to three loads through the second diode D2, the third diode D3 and the fourth diode D4, and simultaneously charges the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, so as to supplement the energy lost when the second switch tube Q2 is turned off. When the system works in DC/AC conversion, firstly, the startup circuit starts working to provide a startup voltage for the first auxiliary power supply circuit, when a first switch tube Q1 of the startup circuit is conducted, the primary side inductive current of an isolation transformer T1 starts rising, at the moment, a diode D1 is cut off, the isolation transformer T1 stores energy, and a first capacitor C1 provides energy for the first auxiliary power supply circuit after passing through a combining converter; when the first switching tube Q1 is turned off, the induced voltage of the primary inductor of the isolation transformer T1 is reversed, at this time, the diode D1 is turned on, the energy of the isolation transformer T1 supplies power to the first auxiliary power supply circuit through the diode D1, and the first capacitor C1 is charged at the same time, so that the energy lost when the first switching tube Q1 is turned off is supplemented; the first auxiliary power supply circuit starts to work after receiving the starting voltage, outputs multi-path voltage after flyback conversion to supply power for the bidirectional converter, when the bus voltage rises after power conversion works, and when the bus voltage is larger than the starting voltage provided by the starting circuit, the first auxiliary power supply circuit is switched to supply power for the bus voltage, and the starting circuit stops working.
Referring to fig. 9, an electrical system 20 according to an embodiment of the present invention includes an auxiliary power system 21 and a bidirectional converter 22, where the auxiliary power system 21 is electrically connected to the bidirectional converter 22, the auxiliary power system supplies power to the bidirectional converter, and the bidirectional converter 22 is configured to convert ac power into dc power or convert dc power into ac power. The auxiliary power supply system 21 may be the auxiliary power supply system described in any of the above embodiments.
It should be noted that the above-described embodiments are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An auxiliary power supply system for a bidirectional converter for supplying power to a control circuit of the bidirectional converter, the auxiliary power supply system comprising: the circuit comprises a startup circuit, a first auxiliary power supply circuit and a combiner selector;
the input end of the starting circuit is connected with low-voltage input voltage, the output end of the starting circuit is connected with the first input end of the combination selector, the starting circuit is used for isolating and boosting the low-voltage input voltage, the second input end of the combination selector is connected with bus voltage, the output end of the combination selector is connected with the input end of a first auxiliary power supply circuit, the output end of the first auxiliary power supply circuit is the power supply output end of the auxiliary power supply system, and the first auxiliary power supply circuit is used for isolating and converting the input voltage of the first auxiliary power supply circuit.
2. The auxiliary power supply system according to claim 1, wherein the start-up circuit comprises a first flyback circuit, an input terminal of the first flyback circuit is connected to the low-voltage input voltage, and an output terminal of the flyback circuit is connected to the first input terminal of the combiner selector.
3. The auxiliary power supply system according to claim 2, wherein the first flyback circuit includes a first isolation transformer, a first diode, a first capacitor and a first switch tube control circuit, the primary side of the first isolation transformer is connected to the low-voltage input voltage and the first switch tube control circuit, the anode of the first diode is connected to the first end of the secondary side of the first isolation transformer, the cathode of the first diode is connected to the first end of the first capacitor and the first input end of the combiner selector, and the second end of the first capacitor is connected to the second end of the secondary side of the isolation transformer and the ground.
4. The auxiliary power supply system according to claim 3, wherein the first switching tube control circuit comprises a first control chip and a first switching tube, an output end of the first control chip is connected to a gate of the first switching tube, a source of the first switching tube is grounded, and a drain of the first switching tube is connected to the second end of the primary side of the first isolation transformer.
5. The auxiliary power supply system according to any one of claims 1 to 4, wherein the first auxiliary power supply circuit comprises a second flyback circuit, an input end of the second flyback circuit is connected to the output end of the combiner selector, and an output end of the second flyback circuit is a power supply output end of the auxiliary power supply system and is used for being connected to a control circuit of the bidirectional converter.
6. The auxiliary power supply system of claim 5, wherein at least one output of the second flyback circuit.
7. The auxiliary power supply system of claim 5, wherein the second flyback circuit comprises a second isolation transformer, at least one diode, at least one capacitor, and a second switching tube control circuit, the second isolation transformer comprising at least one secondary side;
the primary side of the second isolation transformer is respectively connected with the output end of the combiner selector and the first switch tube control circuit, each secondary side is connected with a diode and a capacitor, the first end of each secondary side is connected with the anode of the diode, the cathode of the diode is connected with the first end of the capacitor, the second end of the capacitor is connected with the second end of the secondary side, and the first end of the capacitor and the second end of the capacitor are power supply output ends of the auxiliary power supply system.
8. The auxiliary power supply system according to claim 7, wherein the second switching tube control circuit comprises a second control chip and a second switching tube, an output end of the second control chip is connected to a gate of the second switching tube, a source of the second switching tube is grounded, and a drain of the second switching tube is connected to the second primary end of the second isolation transformer.
9. The auxiliary power supply system of claim 1, wherein the low voltage input voltage is a low voltage battery voltage.
10. An electrical system comprising an auxiliary power supply system as claimed in any one of claims 1 to 9 and a bidirectional converter, the auxiliary power supply system being connected to the bidirectional converter, the bidirectional converter being adapted to convert ac power to dc power or dc power to ac power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110424890.9A CN113131753A (en) | 2021-04-20 | 2021-04-20 | Auxiliary power supply system of bidirectional converter and power utilization system |
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| CN202110424890.9A CN113131753A (en) | 2021-04-20 | 2021-04-20 | Auxiliary power supply system of bidirectional converter and power utilization system |
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| CN113131753A true CN113131753A (en) | 2021-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024044999A1 (en) * | 2022-08-31 | 2024-03-07 | 深圳市富兰瓦时技术有限公司 | Auxiliary power source for energy storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024044999A1 (en) * | 2022-08-31 | 2024-03-07 | 深圳市富兰瓦时技术有限公司 | Auxiliary power source for energy storage system |
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