CN221127148U - Self-driving circuit of miniature grid-connected inverter and inverter - Google Patents
Self-driving circuit of miniature grid-connected inverter and inverter Download PDFInfo
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- CN221127148U CN221127148U CN202322655706.9U CN202322655706U CN221127148U CN 221127148 U CN221127148 U CN 221127148U CN 202322655706 U CN202322655706 U CN 202322655706U CN 221127148 U CN221127148 U CN 221127148U
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- 230000000087 stabilizing effect Effects 0.000 claims description 4
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- 230000008859 change Effects 0.000 abstract description 4
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- 230000007306 turnover Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 2
- 235000008429 bread Nutrition 0.000 description 1
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Abstract
The utility model discloses a self-driving circuit of a miniature grid-connected inverter and the inverter, wherein the driving circuit comprises an upper bridge driving unit and a lower bridge driving unit which is connected with the upper bridge driving unit in parallel, the upper bridge driving unit comprises a first switching tube driving unit and a second switching tube driving unit, the first switching tube driving unit comprises a first bootstrap capacitor, a first current limiting resistor, a first driving main loop formed by connecting one input end of the first switching tube and two input ends of the first switching tube in series, and the two output ends of the first driving main loop are connected with a first zener diode Z1 and a first triode Q6 in parallel; the self-driving circuit does not need MCU to control, can automatically send a proper driving signal in cooperation with the change of the voltage of the power grid, does not need an auxiliary power supply to supply power, directly obtains energy from the power grid, does not need optocoupler isolation to output the driving information to a switching tube, solves the problem that the driving is not commonly grounded, saves the circuit cost, and is more convenient to realize.
Description
Technical Field
The utility model relates to the technical field of inverters, in particular to a self-driving circuit of a miniature grid-connected inverter and the inverter.
Background
Most of the existing micro photovoltaic grid-connected inverters are pseudo-direct current bus type, namely steamed bread waves are modulated, and then power frequency inversion is carried out, as shown in a power frequency half-wave turnover circuit in FIG. 1. The control of the inverter bridge is to collect the voltage phase of the power grid first, then the MCU sends out a control signal, and the control signal sent out by the MCU is insufficient to drive the switching tube of the power frequency half-wave turnover circuit to be conducted, so that the control signal sent out by the MCU needs to be amplified by the driving chip and then the switching tube is driven to be conducted, and the primary side and the secondary side of the power frequency half-wave turnover circuit are not grounded commonly and the upper bridge reference ground is different from the lower bridge, so that the power frequency half-wave turnover circuit also needs to be isolated by an optical coupler and then output to the switching tube.
Fig. 2 is a circuit diagram of a full-bridge driving circuit in the prior art, wherein the MCU processes various detected signals and then sends PWM signals to the driving chip, and the driving signals sent by the driving chip can drive the switching tube of the power frequency half-wave flip circuit after isolation, so that the switching tube is also required to be isolated by an optical coupler, and the control is complex and the cost is high.
Disclosure of utility model
The technical problem to be solved by the utility model is to provide a self-driving circuit of a miniature grid-connected inverter, which does not need MCU to control, can automatically send out a proper driving signal in cooperation with the change of the voltage of a power grid, does not need an auxiliary power supply to supply power, directly obtains energy from the power grid, does not need optocoupler isolation to output the driving information to a switching tube, solves the problem that the driving is not commonly grounded, saves the circuit cost, and is more convenient to realize.
In order to solve the technical problems, the utility model provides a self-driving circuit of a micro grid-connected inverter, which comprises an upper bridge driving unit and a lower bridge driving unit connected with the upper bridge driving unit in parallel, wherein the upper bridge driving unit comprises a first switching tube Q1 driving unit and a second switching tube Q2 driving unit, the first switching tube Q1 driving unit comprises a first bootstrap capacitor C1, a first current limiting resistor R2, a first driving main loop formed by connecting an input end of the first switching tube Q1 and an input end of the first switching tube Q1 in series, the output ends of the first driving main loop are connected with a first voltage stabilizing diode Z1 and a first triode Q6 in parallel,
The base electrode of the first triode Q6 is connected with a first charging capacitor C2 and one end of a first driving resistor R1, the emitter electrode of the first triode Q6 and the other end of the first charging capacitor C2 are connected with a branch where one input end of the first switching tube Q1 is located, the collector electrode of the first triode Q6 and the other end of the first driving resistor R1 are connected with a branch where two input ends of the first switching tube Q1 are located, and one end of the first charging capacitor C2 is connected with one end of the first driving resistor R1;
the second switching tube Q2 driving unit comprises a second bootstrap capacitor C3, a second current-limiting resistor R5, a second driving main loop formed by connecting one end of the input of the second switching tube Q2 and two ends of the input of the second switching tube Q2 in series, a second zener diode Z2 and a second triode Q5 are connected in parallel at two ends of the output of the second driving main loop,
The base electrode of the second triode Q5 is connected with a second charging capacitor C4 and one end of a second driving resistor R4, the emitter electrode of the second triode Q5 and the other end of the second charging capacitor C4 are connected with a branch where two input ends of the second switching tube Q2 are located, the collector electrode of the second triode Q5 and the other end of the second driving resistor R4 are connected with a branch where one input end of the second switching tube Q2 is located, and one end of the second charging capacitor C4 is connected with one end of the second driving resistor R4;
The branch circuit where the input end of the first switch tube Q1 is located is connected with one end of a second bootstrap capacitor C3 through a second bootstrap capacitor charging branch circuit, the branch circuit where the input end of the second switch tube Q2 is located is connected with one end of the first bootstrap capacitor C1 through a first bootstrap capacitor charging branch circuit, one end of an input power supply is connected with the other end of the first bootstrap capacitor C1 and the starting point of the branch circuit where the input end of the first switch tube Q1 is located, and the two ends of the input power supply are connected with the other end of the second bootstrap capacitor C3 and the starting point of the branch circuit where the input end of the second switch tube Q2 is located.
The lower bridge driving unit comprises a lower bridge driving loop for driving the third switching tube Q3 and the fourth switching tube Q4, and the lower bridge driving loop is connected with one end of the input power supply and two ends of the input power supply.
Preferably, the second bootstrap capacitor charging branch circuit includes a first diode D1, a second diode D2, a common resistor R3, and a sixth diode D6, where the branch circuit where the input end of the first switching tube Q1 is located is connected to one end of the second bootstrap capacitor C3 through the first diode D1, the second diode D2, the common resistor R3, and the sixth diode D6.
Preferably, the first bootstrap capacitor charging branch includes a fourth diode D4, a fifth diode D5, a common resistor R3, and a third diode D3, where the fourth diode D4, the fifth diode D5, the common resistor R3, and the third diode D3 are connected to one end of the first bootstrap capacitor C1.
Preferably, the lower bridge driving circuit includes an input power source end, an input power source two ends, a third current limiting resistor R6, a fourth current limiting resistor R7, a fifth current limiting resistor R8, a sixth current limiting resistor R9, a third zener diode Z3, a fourth zener diode Z4, an input end of the third switching tube Q3, an input end of the fourth switching tube Q4, and an input common two ends EP1 of the third switching tube Q3 and the fourth switching tube Q4;
The input power supply end, the third current limiting resistor R6, the fourth current limiting resistor R7, the third zener diode Z3, the fourth zener diode Z4, the fifth current limiting resistor R8, the sixth current limiting resistor R9 and the two ends of the input power supply are connected in series; an input end of the third switching tube Q3 is disposed between the fourth current limiting resistor R7 and the third zener diode Z3, and an input end of the fourth switching tube Q4 is disposed between the fifth current limiting resistor R8 and the fourth zener diode Z4; the input common two ends EP1 of the third switching tube Q3 and the fourth switching tube Q4 are connected with one end of the third zener diode Z3 and one end of the fourth zener diode Z4.
Preferably, the lower bridge driving circuit further includes a first parallel diode D9 and a second parallel diode D10, the first parallel diode D9 is connected in parallel to two ends of the third current limiting resistor R6, and the second parallel diode D10 is connected in parallel to two ends of the sixth current limiting resistor R9.
Preferably, the inverter comprises a self-driving circuit of the micro grid-connected inverter.
In order to solve the problems, the utility model also provides an inverter which comprises the self-driving circuit of the miniature grid-connected inverter.
After the circuit is adopted, the self-driving circuit of the miniature grid-connected inverter comprises an upper bridge driving unit and a lower bridge driving unit which is connected with the upper bridge driving unit in parallel, wherein the upper bridge driving unit comprises a first switching tube Q1 driving unit and a second switching tube Q2 driving unit, the first switching tube Q1 driving unit comprises a first bootstrap capacitor C1, a first current limiting resistor R2, a first driving main loop formed by connecting one input end of the first switching tube Q1 and two input ends of the first switching tube Q1 in series, a first voltage stabilizing diode Z1 and a first triode Q6 are connected in parallel at two output ends of the first driving main loop, a base electrode of the first triode Q6 is connected with a first charging capacitor C2 and one end of the first driving resistor R1, an emitter electrode of the first triode Q6 and the other end of the first charging capacitor C2 are connected with a branch where one input end of the first switching tube Q1 is located, and the other end of the first triode Q6 and the other end of the first driving resistor R1 are connected with one end of the first charging capacitor C1; the second switching tube Q2 driving unit comprises a second bootstrap capacitor C3, a second current-limiting resistor R5, a second driving main loop formed by connecting an input end of the second switching tube Q2 and an input end of the second switching tube Q2 in series, a second zener diode Z2 and a second triode Q5 are connected in parallel to the output end of the second driving main loop, a base electrode of the second triode Q5 is connected with a second charging capacitor C4 and one end of a second driving resistor R4, an emitter electrode of the second triode Q5 and the other end of the second charging capacitor C4 are connected with a branch where the input end of the second switching tube Q2 is located, a collector electrode of the second triode Q5 and the other end of the second driving resistor R4 are connected with a branch where the input end of the second switching tube Q2 is located, and one end of the second charging capacitor C4 is connected with one end of the second driving resistor R4; the branch circuit where the input end of the first switch tube Q1 is located is connected with one end of a second bootstrap capacitor C3 through a second bootstrap capacitor charging branch circuit, the branch circuit where the input two ends of the second switch tube Q2 are located is connected with one end of the first bootstrap capacitor C1 through a first bootstrap capacitor charging branch circuit, one end of an input power supply is connected with the other end of the first bootstrap capacitor C1 and the starting point of the branch circuit where the input end of the first switch tube Q1 is located, and the two ends of the input power supply are connected with the other end of the second bootstrap capacitor C3 and the starting point of the branch circuit where the input two ends of the second switch tube Q2 are located; the lower bridge driving unit comprises a lower bridge driving loop for driving a third switching tube Q3 and a fourth switching tube Q4, and the lower bridge driving loop is connected with one end of the input power supply and two ends of the input power supply; the self-driving circuit of the miniature grid-connected inverter does not need MCU to control, can automatically send a proper driving signal in cooperation with the change of the voltage of a power grid, does not need an auxiliary power supply to supply power, directly obtains energy from the power grid, does not need optocoupler isolation and outputs the driving information to a switching tube, solves the problem that the driving is not grounded together, saves the circuit cost, and is more convenient to realize.
Drawings
FIG. 1 is a circuit diagram of a prior art power frequency half-wave flip circuit;
FIG. 2 is a circuit diagram of a prior art full bridge drive circuit;
fig. 3 is a circuit diagram of a self-driving circuit of the micro grid-connected inverter of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1
Referring to fig. 3, fig. 3 is a circuit diagram of a self-driving circuit of the micro grid-connected inverter according to the present utility model;
The embodiment discloses a self-driving circuit of a micro grid-connected inverter, which comprises an upper bridge driving unit 10 and a lower bridge driving unit 20 connected with the upper bridge driving unit 10 in parallel, wherein the upper bridge driving unit 10 comprises a first switching tube Q1 driving unit 11 and a second switching tube Q2 driving unit 12, the first switching tube Q1 driving unit 11 comprises a first bootstrap capacitor C1, a first current limiting resistor R2, a first driving main loop formed by connecting an input end of the first switching tube Q1 and two input ends of the first switching tube Q1 in series, a first voltage stabilizing diode Z1 and a first triode Q6 are connected in parallel at two output ends of the first driving main loop,
The base electrode of the first triode Q6 is connected with a first charging capacitor C2 and one end of a first driving resistor R1, the emitter electrode of the first triode Q6 and the other end of the first charging capacitor C2 are connected with a branch where one input end of the first switching tube Q1 is located, the collector electrode of the first triode Q6 and the other end of the first driving resistor R1 are connected with a branch where two input ends of the first switching tube Q1 are located, and one end of the first charging capacitor C2 is connected with one end of the first driving resistor R1;
The second switching tube Q2 driving unit 12 comprises a second bootstrap capacitor C3, a second current-limiting resistor R5, a second driving main loop formed by connecting an input end of the second switching tube Q2 and two input ends of the second switching tube Q2 in series, a second zener diode Z2 and a second triode Q5 are connected in parallel at two output ends of the second driving main loop,
The base electrode of the second triode Q5 is connected with a second charging capacitor C4 and one end of a second driving resistor R4, the emitter electrode of the second triode Q5 and the other end of the second charging capacitor C4 are connected with a branch where two input ends of the second switching tube Q2 are located, the collector electrode of the second triode Q5 and the other end of the second driving resistor R4 are connected with a branch where one input end of the second switching tube Q2 is located, and one end of the second charging capacitor C4 is connected with one end of the second driving resistor R4;
The branch circuit where the input end of the first switch tube Q1 is located is connected with one end of a second bootstrap capacitor C3 through a second bootstrap capacitor charging branch circuit, the branch circuit where the input end of the second switch tube Q2 is located is connected with one end of the first bootstrap capacitor C1 through a first bootstrap capacitor charging branch circuit, one end of an input power supply is connected with the other end of the first bootstrap capacitor C1 and the starting point of the branch circuit where the input end of the first switch tube Q1 is located, and the two ends of the input power supply are connected with the other end of the second bootstrap capacitor C3 and the starting point of the branch circuit where the input end of the second switch tube Q2 is located.
The lower bridge driving unit 20 includes a lower bridge driving circuit for driving the third switching tube Q3 and the fourth switching tube Q4, and the lower bridge driving circuit is connected to one end of the input power supply and two ends of the input power supply.
Example two
In this embodiment, the second bootstrap capacitor charging branch includes a first diode D1, a second diode D2, a common resistor R3, and a sixth diode D6, where the branch where the input end of the first switching tube Q1 is located is connected to one end of the second bootstrap capacitor C3 through the first diode D1, the second diode D2, the common resistor R3, and the sixth diode D6.
The first bootstrap capacitor charging branch circuit comprises a fourth diode D4, a fifth diode D5, a common resistor R3 and a third diode D3, and the fourth diode D4, the fifth diode D5, the common resistor R3 and the third diode D3 are connected with one end of the first bootstrap capacitor C1.
Example III
In the present embodiment, the lower bridge driving circuit 20 includes an input power source end, a third current limiting resistor R6, a fourth current limiting resistor R7, a fifth current limiting resistor R8, a sixth current limiting resistor R9, a third zener diode Z3, a fourth zener diode Z4, an input end of the third switching tube Q3, an input end of the fourth switching tube Q4, and an input common end EP1 of the third switching tube Q3 and the fourth switching tube Q4;
The input power supply end, the third current limiting resistor R6, the fourth current limiting resistor R7, the third zener diode Z3, the fourth zener diode Z4, the fifth current limiting resistor R8, the sixth current limiting resistor R9 and the two ends of the input power supply are connected in series; an input end of the third switching tube Q3 is disposed between the fourth current limiting resistor R7 and the third zener diode Z3, and an input end of the fourth switching tube Q4 is disposed between the fifth current limiting resistor R8 and the fourth zener diode Z4; the input common two ends EP1 of the third switching tube Q3 and the fourth switching tube Q4 are connected with one end of the third zener diode Z3 and one end of the fourth zener diode Z4.
In this embodiment, the lower bridge driving circuit 20 further includes a first parallel diode D9 and a second parallel diode D10, the first parallel diode D9 is connected in parallel to two ends of the third current limiting resistor R6, and the second parallel diode D10 is connected in parallel to two ends of the sixth current limiting resistor R9.
Example IV
The embodiment discloses an inverter, which comprises the self-driving circuit of the micro grid-connected inverter according to any one of the first to third embodiments.
The self-driving circuit of the miniature grid-connected inverter does not need MCU to control, can automatically send a proper driving signal in cooperation with the change of the voltage of a power grid, does not need an auxiliary power supply to supply power, directly obtains energy from the power grid, does not need optocoupler isolation and outputs the driving information to a switching tube, solves the problem that the driving is not grounded together, saves the circuit cost, and is more convenient to realize.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present application shall fall within the scope of the appended claims.
Claims (6)
1. The self-driving circuit of the miniature grid-connected inverter is characterized by comprising an upper bridge driving unit and a lower bridge driving unit which is connected with the upper bridge driving unit in parallel, wherein the upper bridge driving unit comprises a first switching tube Q1 driving unit and a second switching tube Q2 driving unit, the first switching tube Q1 driving unit comprises a first bootstrap capacitor C1, a first current limiting resistor R2, a first driving main loop formed by connecting an input end of the first switching tube Q1 and two input ends of the first switching tube Q1 in series, and two output ends of the first driving main loop are connected with a first voltage stabilizing diode Z1 and a first triode Q6 in parallel;
The base electrode of the first triode Q6 is connected with a first charging capacitor C2 and one end of a first driving resistor R1, the emitter electrode of the first triode Q6 and the other end of the first charging capacitor C2 are connected with a branch where one input end of the first switching tube Q1 is located, the collector electrode of the first triode Q6 and the other end of the first driving resistor R1 are connected with a branch where two input ends of the first switching tube Q1 are located, and one end of the first charging capacitor C2 is connected with one end of the first driving resistor R1;
The second switching tube Q2 driving unit comprises a second bootstrap capacitor C3, a second current-limiting resistor R5, a second driving main loop formed by connecting an input end of a second switching tube Q2 and two input ends of the second switching tube Q2 in series, and a second zener diode Z2 and a second triode Q5 are connected in parallel at two output ends of the second driving main loop;
the base electrode of the second triode Q5 is connected with a second charging capacitor C4 and one end of a second driving resistor R4, the emitter electrode of the second triode Q5 and the other end of the second charging capacitor C4 are connected with a branch where two input ends of the second switching tube Q2 are located, the collector electrode of the second triode Q5 and the other end of the second driving resistor R4 are connected with a branch where one input end of the second switching tube Q2 is located, and one end of the second charging capacitor C4 is connected with one end of the second driving resistor R4;
The branch circuit where the input end of the first switch tube Q1 is located is connected with one end of a second bootstrap capacitor C3 through a second bootstrap capacitor charging branch circuit, the branch circuit where the input two ends of the second switch tube Q2 are located is connected with one end of the first bootstrap capacitor C1 through a first bootstrap capacitor charging branch circuit, one end of an input power supply is connected with the other end of the first bootstrap capacitor C1 and the starting point of the branch circuit where the input end of the first switch tube Q1 is located, and the two ends of the input power supply are connected with the other end of the second bootstrap capacitor C3 and the starting point of the branch circuit where the input two ends of the second switch tube Q2 are located;
The lower bridge driving unit comprises a lower bridge driving loop for driving the third switching tube Q3 and the fourth switching tube Q4, and the lower bridge driving loop is connected with one end of the input power supply and two ends of the input power supply.
2. The self-driving circuit of a micro grid-connected inverter according to claim 1, wherein the second bootstrap capacitor charging branch circuit comprises a first diode D1, a second diode D2, a common resistor R3 and a sixth diode D6, and the branch circuit where the input end of the first switching tube Q1 is located is connected with one end of the second bootstrap capacitor C3 through the first diode D1, the second diode D2, the common resistor R3 and the sixth diode D6.
3. The self-driving circuit of the micro grid-connected inverter according to claim 1, wherein the first bootstrap capacitor charging branch circuit comprises a fourth diode D4, a fifth diode D5, a common resistor R3 and a third diode D3, and the fourth diode D4, the fifth diode D5, the common resistor R3 and the third diode D3 are connected to one end of the first bootstrap capacitor C1.
4. The self-driving circuit of a micro grid-connected inverter according to claim 1, wherein the lower bridge driving circuit comprises an input power supply end, an input power supply two ends, a third current limiting resistor R6, a fourth current limiting resistor R7, a fifth current limiting resistor R8, a sixth current limiting resistor R9, a third zener diode Z3, a fourth zener diode Z4, an input end of a third switching tube Q3, an input end of a fourth switching tube Q4, and input common two ends EP1 of the third switching tube Q3 and the fourth switching tube Q4;
The input power supply end, the third current limiting resistor R6, the fourth current limiting resistor R7, the third zener diode Z3, the fourth zener diode Z4, the fifth current limiting resistor R8, the sixth current limiting resistor R9 and the two ends of the input power supply are connected in series; an input end of the third switching tube Q3 is disposed between the fourth current limiting resistor R7 and the third zener diode Z3, and an input end of the fourth switching tube Q4 is disposed between the fifth current limiting resistor R8 and the fourth zener diode Z4; the input common two ends EP1 of the third switching tube Q3 and the fourth switching tube Q4 are connected with one end of the third zener diode Z3 and one end of the fourth zener diode Z4.
5. The self-driving circuit of a micro grid-connected inverter according to claim 4, wherein the lower bridge driving circuit further comprises a first parallel diode D9 and a second parallel diode D10, the first parallel diode D9 is connected in parallel to two ends of the third current limiting resistor R6, and the second parallel diode D10 is connected in parallel to two ends of the sixth current limiting resistor R9.
6. An inverter comprising the self-driving circuit of the micro grid-connected inverter of any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322655706.9U CN221127148U (en) | 2023-09-28 | 2023-09-28 | Self-driving circuit of miniature grid-connected inverter and inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322655706.9U CN221127148U (en) | 2023-09-28 | 2023-09-28 | Self-driving circuit of miniature grid-connected inverter and inverter |
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| CN221127148U true CN221127148U (en) | 2024-06-11 |
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| CN202322655706.9U Active CN221127148U (en) | 2023-09-28 | 2023-09-28 | Self-driving circuit of miniature grid-connected inverter and inverter |
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| CN (1) | CN221127148U (en) |
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2023
- 2023-09-28 CN CN202322655706.9U patent/CN221127148U/en active Active
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