CN209748429U - DC-AC conversion circuit and energy storage power supply - Google Patents
DC-AC conversion circuit and energy storage power supply Download PDFInfo
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- CN209748429U CN209748429U CN201920573516.3U CN201920573516U CN209748429U CN 209748429 U CN209748429 U CN 209748429U CN 201920573516 U CN201920573516 U CN 201920573516U CN 209748429 U CN209748429 U CN 209748429U
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Abstract
A DC-AC conversion circuit connected to a battery, the DC-AC conversion circuit comprising: the working power supply module is connected with the battery and used for providing a plurality of working power supplies; the high-voltage power supply generation module is connected with the working power supply module and the battery and is used for converting the battery into a high-voltage direct-current power supply; the control module is connected with the working power supply module and used for generating a first driving signal; and the inversion module is connected with the high-voltage power supply generation module and the control module and is used for converting the high-voltage direct current power supply into a preset alternating current power supply. The application also discloses an energy storage power supply which comprises the DC-AC conversion circuit. The problem of can't satisfy the demand that turns into high-pressure alternating current power supply with low pressure direct current power supply reversal in some occasions that exists among the traditional technical scheme is solved.
Description
Technical Field
The utility model belongs to the technical field of the power, especially, relate to a DC-AC converting circuit and energy storage power.
Background
at present, generally, a product which can be carried along with sound and can supply power to the outside generally outputs a low-voltage power supply, for example, a common battery, and some electrical appliances and other equipment need a normal standard power frequency alternating current power supply, but a traditional DC-AC conversion circuit generally changes a low-voltage direct current power supply into a low-voltage alternating current power supply or changes a high-voltage direct current power supply into a high-voltage alternating current power supply, and cannot meet the requirement of reversely changing the low-voltage direct current power supply into the high-voltage alternating current power supply in some occasions.
Therefore, the conventional technical scheme has the problem that the requirement of inverting a low-voltage direct-current power supply into a high-voltage alternating-current power supply in some occasions cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a DC-AC converting circuit and an energy storage power supply, which aims to solve the problem that the requirement of inverting a low-voltage DC power supply into a high-voltage AC power supply in some occasions cannot be met in the conventional technical solution.
The utility model discloses the first aspect of the embodiment provides a DC-AC converting circuit, its characterized in that, is connected with the battery, DC-AC converting circuit includes: the working power supply module is connected with the battery and used for providing a plurality of working power supplies; the high-voltage power supply generation module is connected with the working power supply module and the battery and is used for converting the battery into a high-voltage direct-current power supply; the control module is connected with the working power supply module and used for generating a first driving signal; and the inversion module is connected with the high-voltage power supply generation module and the control module and is used for converting the high-voltage direct current power supply into a preset alternating current power supply.
In one embodiment, the operating power supply module includes: the power supply end of the first driving chip is connected with the battery through the first resistor, the dotted terminal of the primary side main winding of the three-winding transformer is connected with the positive electrode of the battery, the non-dotted terminal of the primary side main winding of the three-winding transformer is connected with the high potential terminal of the first switching tube, the low potential terminal of the first switching tube is grounded, the control terminal of the first switching tube is connected with the output end of the first driving chip, the first terminal of the non-dotted terminal of the primary side secondary winding of the three-winding transformer is connected with the positive electrode of the first diode, the negative electrode of the first diode is connected with the first terminal of the first capacitor in common to be used as the positive output end of the first working voltage, the second end of the first capacitor and the homonymous end of the primary side secondary winding of the three-winding transformer are connected to the ground in common, the homonymous end of the secondary side winding of the three-winding transformer and the anode of the second diode and the first end of the second capacitor are connected to the ground in common, the non-homonymous end of the secondary side winding of the three-winding transformer and the anode of the third diode are connected, and the cathode of the second diode, the cathode of the third diode and the second end of the second capacitor are connected in common to serve as the positive output end of the second working voltage.
In one embodiment, the high voltage power generating module includes: the driving unit is connected with the working power supply module and used for generating a second driving signal; and the boosting unit is connected with the driving unit and the battery and used for converting the battery into a high-voltage direct-current power supply according to the second driving signal.
in one embodiment, the driving unit includes a PWM driving chip, a second resistor, a third resistor, a first transistor, a second transistor, a third transistor, and a fourth transistor, a power supply terminal of the PWM driving chip is connected to an output terminal of the operating power module, a first output terminal of the PWM driving chip is connected to a base of the first transistor and a base of the second transistor through the second resistor, a second output terminal of the PWM driving chip is connected to a base of the third transistor and a base of the fourth transistor through the third resistor, a collector of the first transistor and a collector of the third transistor are connected to an output terminal of the operating power module, a collector of the second transistor and a collector of the third transistor are connected to ground, an emitter of the first transistor and an emitter of the second transistor are connected to serve as the first output terminal of the driving unit, and the emitter of the third triode and the emitter of the fourth triode are connected together to be used as a second output end of the driving unit.
in one embodiment, the boosting unit includes: a second switch tube, a third capacitor, a fourth capacitor and a step-up transformer, wherein the control end of the second switch tube is connected with the first output end of the driving unit, the control end of the third switching tube is connected with the second output end of the driving unit, the high-voltage end of the second switching tube is connected with the first end of the third capacitor and the first end of the primary side winding of the boosting transformer, the second end of the third capacitor, the first end of the fourth capacitor, the low potential end of the second switching tube and the low potential end of the third switching tube are connected to the ground in common, the second end of the primary winding of the boosting transformer is connected with the battery, the third end of the primary winding of the boosting transformer is connected with the second end of the fourth capacitor and the high-potential end of the third switching tube, and the output end of the secondary winding of the boosting transformer outputs a high-voltage direct-current power supply.
In one embodiment, the control module includes a pure sine wave inverter.
In one embodiment, the inverter module includes: a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein a control end of the fourth switching tube is connected with the first high output end of the control module, a control end of the fifth switching tube is connected with the second high output end of the control module, a control end of the sixth switching tube is connected with the first low output end of the control module, a control end of the seventh switching tube is connected with the second low output end of the control module, a high potential end of the fourth switching tube, a first end of the fifth capacitor, a first end of the sixth capacitor and a high potential end of the fifth switching tube are connected to an output end of the high voltage power generation module in common, a low potential end of the fourth switching tube, a high potential end of the sixth switching tube and a first end of the seventh capacitor are connected to a first output end of the inversion module in common, the low potential end of the fifth switching tube, the high potential end of the seventh switching tube and the second end of the seventh capacitor are connected in common as the second output end of the inverter module, and the low potential end of the sixth switching tube, the second end of the fifth capacitor, the low potential end of the seventh switching tube and the second end of the sixth capacitor are connected in common to ground.
A second aspect of an embodiment of the present invention provides an energy storage power supply, including the DC-AC converting circuit as described above; a battery connected to the DC-AC conversion circuit; the charging interface is connected with the battery and used for inputting charging voltage to charge the battery; and a discharge interface connected to the DC-AC conversion circuit for outputting a discharge voltage.
In one embodiment, the energy storage power supply further comprises a first switch, and the DC-AC conversion circuit is connected to the battery through the first switch.
In one embodiment, the energy storage power supply further comprises a second switch, and the DC-AC conversion circuit is connected to the discharging interface through the second switch.
According to the DC-AC conversion circuit, the working power supply module, the high-voltage power supply generation module, the control module and the inversion module are added, so that an input low-voltage direct-current power supply is converted into a preset alternating-current power supply under the control of the control module, and the problem that the requirement that the low-voltage direct-current power supply is inverted into the high-voltage alternating-current power supply in some occasions cannot be met in the traditional technical scheme is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a DC-AC conversion circuit according to an embodiment of the present invention;
FIG. 2 is an exemplary circuit schematic of an operating power supply module in the DC-AC converter circuit of FIG. 1;
FIG. 3 is a schematic circuit diagram of a high voltage power generating module in the DC-AC converting circuit shown in FIG. 1;
FIG. 4 is an exemplary circuit schematic of a drive unit in the DC-AC conversion circuit shown in FIG. 3;
FIG. 5 is an exemplary circuit schematic of the boost unit in the DC-AC converter circuit shown in FIG. 3;
FIG. 6 is an exemplary circuit schematic of an inverter module in the DC-AC converter circuit shown in FIG. 1;
Fig. 7 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a circuit diagram of a DC-AC conversion circuit according to a first embodiment of the present invention is shown, for convenience of illustration, only the relevant portions of the embodiment are shown, and the following details are described:
The DC-AC conversion circuit in the present embodiment is connected to the battery 100, and includes: the battery 100 is connected with the working power supply module 200 and the high-voltage power supply generation module 300, the input end of the working power supply module 200 is connected with the battery 100, the first output end of the working power supply module 200 is connected with the high-voltage power supply generation module 300, the second output end of the working power supply module 200 is connected with the control module 400, the output end of the high-voltage power supply generation module 300 is connected with the power supply input end of the inversion module 500, and the control end of the inversion module 500 is connected with the output end of the control module 400; the working power supply module 200 is configured to provide multiple working power supplies, the high voltage power supply generating module 300 is configured to convert the battery 100 into a high voltage dc power supply, the control module 400 is configured to generate a first driving signal, and the inverter module 500 is configured to convert the high voltage dc power supply into a target ac power supply.
The battery 100 may be a low voltage dc power supply 100, such as a polymer battery or 18650 battery; the operating power supply module 200 may be formed by a combination of a DC-DC converter having a voltage conversion function, such as a switching power supply, a transformer, a voltage stabilizing chip, or a DC-DC converter chip; the high voltage power generating module 300 may be formed by a chip with a PWM (Pulse Width Modulation) output, a switching tube, a step-up transformer, and the like; the control module 400 may be formed of a device capable of generating SPWM (Sinusoidal Pulse Width Modulation), such as an SPWM inverter controller; the inverter module 500 may be formed by a bridge driving chip, an inverter bridge, or a switching tube.
It should be understood that the predetermined ac power supply in this embodiment is a power frequency 220V ac power supply, and in other embodiments, other predetermined ac power supplies may be used.
the DC-AC conversion circuit in this embodiment, by adding the working power supply module 200, the high-voltage power supply generation module 300, the control module 400, and the inverter module 500, realizes that the input low-voltage DC power supply 100 is converted into a preset AC power supply under the control of the control module 400, and solves the problem that the requirement for inverting the low-voltage DC power supply 100 into the high-voltage AC power supply in some occasions cannot be met in the conventional technical scheme.
Referring to fig. 2, in one embodiment, the operating power module 200 includes: a first driving chip U1, a first resistor R1, a three-winding transformer T1, a first switch tube Q1, a first diode D1, a second diode D2, a third diode D3, a fourth diode, a first capacitor C1 and a second capacitor C2, wherein the power supply terminal of the first driving chip U1 is connected to the battery 100 through the first resistor R1, the dotted terminal of the primary side main winding of the three-winding transformer T1 is connected to the positive electrode of the battery 100, the non-dotted terminal of the primary side main winding of the three-winding transformer T1 is connected to the high potential terminal of the first switch tube Q1, the low potential terminal of the first switch tube Q1 is grounded, the control terminal of the first switch tube Q1 is connected to the output terminal of the first driving chip U1, the first terminal of the non-dotted terminal of the secondary winding of the three-winding transformer T1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the first output terminal of the first capacitor C1 as the working common output terminal 1, the second end of the first capacitor C1 and the dotted end of the primary side secondary winding of the three-winding transformer T1 are connected to ground, the dotted end of the secondary side winding of the three-winding transformer T1 and the anode of the second diode D2 and the first end of the second capacitor C2 are connected to ground, the non-dotted end of the secondary side winding of the three-winding transformer T1 and the anode of the third diode D3 are connected, and the cathode of the second diode D2, the cathode of the third diode D3 and the second end of the second capacitor C2 are connected to a positive output terminal OUT2 as the second operating voltage.
The first driver chip U1 in this embodiment is a fixed frequency current mode controller with signal UC3843, and in other embodiments, other driver chips capable of outputting a driving signal for driving the switching tube may be used.
It should be understood that the first switch Q1 may be a MOS transistor, an IGBT thyristor, a triode, or the like.
Optionally, a plurality of voltage stabilizing chips can be added, and each voltage stabilizing chip can be connected to the output end of the transformer in sequence, so that various power supplies can be obtained, and the requirements of working voltages of different devices in the circuit can be met.
in the working power supply module 200 of the present embodiment, the first driving chip U1, the first switching tube Q1 and the three-winding transformer are adopted to convert the input battery 100 into a multi-path working power supply, so that different working voltage requirements of a plurality of modules of the DC-AC conversion circuit are met.
referring to fig. 3, in one embodiment, the high voltage power generating module 300 includes: a driving unit 310 and a boosting unit 320, wherein the driving unit 310 is connected with the working power supply module 200, and the boosting unit 320 is connected with the driving unit 310 and the battery 100; the driving unit 310 is configured to generate a second driving signal, and the voltage boosting unit 320 is configured to convert the battery 100 into a high voltage dc power according to the second driving signal.
The driving unit 310 may be formed by a device having a PWM driving output, such as a PWM driving chip U2 and a triode; the boosting unit 320 may be formed by a combination of a switching tube for receiving a driving signal, a boosting transformer, and the like.
Referring to fig. 4, in an embodiment, the driving unit 310 includes a PWM driving chip U2, a third resistor R3, a first transistor Q2, a second transistor Q3, a third transistor Q4 and a fourth transistor Q5, a power supply terminal of the PWM driving chip U2 is connected to the output terminal of the operating power module 200, a first output terminal of the PWM driving chip U2 is connected to the base of the first transistor Q2 and the base of the second transistor Q3 through the second resistor R2, a second output terminal of the PWM driving chip U2 is connected to the base of the third transistor Q4 and the base of the fourth transistor Q5 through the third resistor R3, a collector of the first transistor Q2 and a collector of the third transistor Q4 are connected to the output terminal of the operating power module 200, a collector of the second transistor Q3 and a collector of the third transistor Q4 are connected to ground, an emitter of the first transistor Q2 and an emitter of the second transistor Q3 are connected to the first output terminal of the driving unit 67310, an emitter of the third transistor Q4 and an emitter of the fourth transistor Q5 are commonly connected as a second output terminal of the driving unit 310.
referring to fig. 5, in one embodiment, the boosting unit 320 includes: a second switch tube Q6, a third switch tube Q7, a third capacitor C3, a fourth capacitor C4 and a step-up transformer T2, wherein a control terminal of the second switch Q6 is connected to the first output terminal of the driving unit 310, a control terminal of the third switch Q7 is connected to the second output terminal of the driving unit 310, a high voltage terminal of the second switch Q6 is connected to a first terminal of the third capacitor C3 and a first terminal of the primary winding of the step-up transformer T2, a second terminal of the third capacitor C3, a first terminal of the fourth capacitor C4, a low potential terminal of the second switch Q6, and a low potential terminal of the third switch Q7 are connected to ground, a second terminal of the primary winding of the step-up transformer T2 is connected to the battery 100, a third terminal of the primary winding of the step-up transformer T2 is connected to a second terminal of the fourth capacitor C4 and a high potential terminal of the third switch Q7, and an output terminal OUT3 of the secondary winding of the step-up transformer T2 outputs high voltage dc power.
It should be understood that the second switching tube Q6 and the third switching tube Q7 may be MOS tubes, IGBT thyristors, triodes, or the like.
in one embodiment, the control module 400 includes a pure sine wave inverter, which in this implementation is model EG8010, although in other embodiments other types of pure sine wave inverters may be used.
Referring to fig. 6, in one embodiment, the inverter module 500 includes: a fourth switching tube Q8, a fifth switching tube Q9, a sixth switching tube Q10, a seventh switching tube Q11, a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor, wherein a control end of the fourth switching tube Q8 is connected with a first high output end of the control module 400, a control end of the fifth switching tube Q9 is connected with a second high output end of the control module 400, a control end of the sixth switching tube Q10 is connected with a first low output end of the control module 400, a control end of the seventh switching tube Q11 is connected with a second low output end of the control module 400, a high potential end of the fourth switching tube Q8, a first end of the fifth capacitor C5, a first end of the sixth capacitor C6 and a high potential end of the fifth switching tube Q9 are connected to an output end of the high voltage power generation module 300 in common, a low potential end of the fourth switching tube Q8, a high potential end of the sixth switching tube Q10 and a high potential end of the seventh capacitor Q9 are connected as a common output end of the first inverter module 500, the low-potential end of the fifth switching tube Q9, the high-potential end of the seventh switching tube Q11 and the second end of the seventh capacitor are connected in common as the second output end of the inverter module 500, and the low-potential end of the sixth switching tube Q10, the second end of the fifth capacitor C5, the low-potential end of the seventh switching tube Q11 and the second end of the sixth capacitor C6 are connected in common to ground.
it should be understood that the fourth switching tube Q8, the fifth switching tube Q9, the sixth switching tube Q10 and the seventh switching tube Q11 may be MOS tubes, IGBT thyristors, triodes or the like.
Referring to fig. 7, a second aspect of the embodiment of the present invention provides an energy storage power supply, including the DC-AC converting circuit as described above; a battery 100 connected to the DC-AC conversion circuit; a charging interface 600 connected to the battery 100 for inputting a charging voltage to charge the battery 100; and a discharge interface 700 connected to the DC-AC conversion circuit for outputting a discharge voltage.
It should be understood that the charging interface 600 may be a common charging interface or any Type of USB interface, such as a Micro USB interface, a Type-C interface, or a Type-a interface.
in one embodiment, the energy storage power supply further comprises a first switch, and the DC-AC conversion circuit is connected to the battery 100 through the first switch. It should be understood that the first switch may be a mechanical switch, a modular switch, or the like.
In one embodiment, the energy storage power supply further comprises a second switch, and the DC-AC conversion circuit is connected to the discharge interface through the second switch. It should be understood that the second switch may be a mechanical switch, a modular switch, or the like.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. a DC-AC conversion circuit, connected to a battery, comprising:
The working power supply module is connected with the battery and used for providing a plurality of working power supplies;
The high-voltage power supply generation module is connected with the working power supply module and the battery and is used for converting the battery into a high-voltage direct-current power supply;
The control module is connected with the working power supply module and used for generating a first driving signal; and
And the inversion module is connected with the high-voltage power supply generation module and the control module and is used for converting the high-voltage direct current power supply into a preset alternating current power supply.
2. The DC-AC conversion circuit of claim 1, wherein the operating power supply module comprises: the power supply end of the first driving chip is connected with the battery through the first resistor, the dotted terminal of the primary side main winding of the three-winding transformer is connected with the positive electrode of the battery, the non-dotted terminal of the primary side main winding of the three-winding transformer is connected with the high potential terminal of the first switching tube, the low potential terminal of the first switching tube is grounded, the control terminal of the first switching tube is connected with the output end of the first driving chip, the first terminal of the non-dotted terminal of the primary side secondary winding of the three-winding transformer is connected with the positive electrode of the first diode, the negative electrode of the first diode is connected with the first terminal of the first capacitor in common to be used as the positive output end of the first working voltage, the second end of the first capacitor and the homonymous end of the primary side secondary winding of the three-winding transformer are connected to the ground in common, the homonymous end of the secondary side winding of the three-winding transformer and the anode of the second diode and the first end of the second capacitor are connected to the ground in common, the non-homonymous end of the secondary side winding of the three-winding transformer and the anode of the third diode are connected, and the cathode of the second diode, the cathode of the third diode and the second end of the second capacitor are connected in common to serve as the positive output end of the second working voltage.
3. The DC-AC conversion circuit of claim 1, wherein the high voltage power generation module comprises:
The driving unit is connected with the working power supply module and used for generating a second driving signal; and
and the boosting unit is connected with the driving unit and the battery and used for converting the battery into a high-voltage direct-current power supply according to the second driving signal.
4. The DC-AC converting circuit according to claim 3, wherein the driving unit comprises a PWM driver chip, a second resistor, a third resistor, a first transistor, a second transistor, a third transistor, and a fourth transistor, a power supply terminal of the PWM driver chip is connected to the output terminal of the operating power module, a first output terminal of the PWM driver chip is connected to the base of the first transistor and the base of the second transistor through the second resistor, a second output terminal of the PWM driver chip is connected to the base of the third transistor and the base of the fourth transistor through the third resistor, a collector of the first transistor and a collector of the third transistor are commonly connected to the output terminal of the operating power module, a collector of the second transistor and a collector of the third transistor are commonly connected to ground, and the emitter of the first triode and the emitter of the second triode are connected together to be used as a first output end of the driving unit, and the emitter of the third triode and the emitter of the fourth triode are connected together to be used as a second output end of the driving unit.
5. The DC-AC conversion circuit of claim 3, wherein the boosting unit comprises: a second switch tube, a third capacitor, a fourth capacitor and a step-up transformer, wherein the control end of the second switch tube is connected with the first output end of the driving unit, the control end of the third switching tube is connected with the second output end of the driving unit, the high-voltage end of the second switching tube is connected with the first end of the third capacitor and the first end of the primary side winding of the boosting transformer, the second end of the third capacitor, the first end of the fourth capacitor, the low potential end of the second switching tube and the low potential end of the third switching tube are connected to the ground in common, the second end of the primary winding of the boosting transformer is connected with the battery, the third end of the primary winding of the boosting transformer is connected with the second end of the fourth capacitor and the high-potential end of the third switching tube, and the output end of the secondary winding of the boosting transformer outputs a high-voltage direct-current power supply.
6. the DC-AC conversion circuit of any of claims 1-5, wherein the control module comprises a pure sine wave inverter.
7. The DC-AC conversion circuit of any of claims 1-5, wherein the inverter module comprises: a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, a fifth capacitor, a sixth capacitor and a seventh capacitor, wherein a control end of the fourth switching tube is connected with the first high output end of the control module, a control end of the fifth switching tube is connected with the second high output end of the control module, a control end of the sixth switching tube is connected with the first low output end of the control module, a control end of the seventh switching tube is connected with the second low output end of the control module, a high potential end of the fourth switching tube, a first end of the fifth capacitor, a first end of the sixth capacitor and a high potential end of the fifth switching tube are connected to an output end of the high voltage power generation module in common, a low potential end of the fourth switching tube, a high potential end of the sixth switching tube and a first end of the seventh capacitor are connected to a first output end of the inversion module in common, the low potential end of the fifth switching tube, the high potential end of the seventh switching tube and the second end of the seventh capacitor are connected in common as the second output end of the inverter module, and the low potential end of the sixth switching tube, the second end of the fifth capacitor, the low potential end of the seventh switching tube and the second end of the sixth capacitor are connected in common to ground.
8. An energy storage power supply, comprising:
A DC-AC conversion circuit according to any one of claims 1 to 7;
A battery connected to the DC-AC conversion circuit;
The charging interface is connected with the battery and used for inputting charging voltage to charge the battery; and
And the discharge interface is connected with the DC-AC conversion circuit and used for outputting a discharge voltage.
9. The energy storage power supply of claim 8, further comprising a first switch, wherein said DC-AC conversion circuit is connected to said battery through said first switch.
10. The energy storage power supply of claim 8, further comprising a second switch, wherein said DC-AC conversion circuit is connected to said discharge interface through said second switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920573516.3U CN209748429U (en) | 2019-04-23 | 2019-04-23 | DC-AC conversion circuit and energy storage power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920573516.3U CN209748429U (en) | 2019-04-23 | 2019-04-23 | DC-AC conversion circuit and energy storage power supply |
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| CN209748429U true CN209748429U (en) | 2019-12-06 |
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| CN201920573516.3U Expired - Fee Related CN209748429U (en) | 2019-04-23 | 2019-04-23 | DC-AC conversion circuit and energy storage power supply |
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