CN219802149U - Bus residual voltage discharging circuit and inverter - Google Patents
Bus residual voltage discharging circuit and inverter Download PDFInfo
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- CN219802149U CN219802149U CN202223381868.XU CN202223381868U CN219802149U CN 219802149 U CN219802149 U CN 219802149U CN 202223381868 U CN202223381868 U CN 202223381868U CN 219802149 U CN219802149 U CN 219802149U
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- 238000007599 discharging Methods 0.000 title claims abstract description 72
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Abstract
The utility model provides a bus residual voltage discharging circuit, which comprises: the device comprises an optical coupler, a voltage dividing branch, a clamping protection branch and a discharging branch, wherein a first end of the optical coupler is connected to an auxiliary power supply of the device, a second end of the optical coupler is connected to the clamping protection branch and the discharging branch through the voltage dividing branch, a first end of the voltage dividing branch and a first end of the discharging branch are connected to a positive bus of the device, and a second end of the voltage dividing branch and a second end of the discharging branch are connected to a negative bus of the device. According to the utility model, through the circuit structure with the optimal design, automatic discharge of the residual voltage of the bus of the equipment can be realized when the equipment is turned off/auxiliary power is turned off, a good hardware circuit foundation is provided for automatic discharge of the equipment such as a photovoltaic inverter and the like, a control signal is not required to be added, and the circuit structure is simple and efficient.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a bus residual voltage discharging circuit, and further relates to an inverter comprising the bus residual voltage discharging circuit.
Background
In the application of the photovoltaic inversion field, residual bus voltage exists when power is lost, and discharging is required to be performed by adding a control signal. Taking a photovoltaic inverter as an example, after the equipment is turned off/auxiliary power is turned off, the bus still has a residual voltage of 100V-200V, and at this time, the voltage drops slowly because of no load, so that a control signal needs to be added for discharging. This phenomenon of residual bus voltage is more pronounced if the device bus capacitance of the photovoltaic inverter is a large capacity electrolytic capacitance.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a bus residual voltage discharging circuit capable of realizing automatic discharging through an optimized circuit structure design without adding control signals.
In this regard, the present utility model provides a bus residual voltage discharging circuit comprising: the device comprises an optical coupler, a voltage dividing branch, a clamping protection branch and a discharging branch, wherein a first end of the optical coupler is connected to an auxiliary power supply of the device, a second end of the optical coupler is connected to the clamping protection branch and the discharging branch through the voltage dividing branch, a first end of the voltage dividing branch and a first end of the discharging branch are connected to a positive bus of the device, and a second end of the voltage dividing branch and a second end of the discharging branch are connected to a negative bus of the device.
The utility model further improves that the discharging branch circuit comprises a switching tube, wherein the grid electrode of the switching tube is respectively connected with the first end of the clamping protection branch circuit, the voltage division branch circuit and the optical coupler, and the source electrode of the switching tube and the second end of the clamping protection branch circuit are connected to a negative bus.
The utility model further improves that the discharging branch circuit further comprises a first discharging unit, a fuse and a second discharging unit, wherein the first end of the first discharging unit is connected to the positive bus, the second end of the first discharging unit is connected to the first end of the second discharging unit through the fuse, and the second end of the second discharging unit is connected to the drain electrode of the switching tube.
A further development of the utility model is that the first discharge unit and the second discharge unit each comprise a number of discharge resistors connected in parallel.
A further improvement of the utility model is that the fuse is a recoverable thermal fuse.
The utility model further improves that the clamping protection branch circuit comprises a voltage stabilizing diode, wherein the positive electrode of the voltage stabilizing diode is connected to a negative bus, the negative electrode of the voltage stabilizing diode is connected to a clamping connection point of the discharging branch circuit, and the clamping connection point is a connection point of the discharging branch circuit, the optocoupler and the voltage dividing branch circuit.
The utility model further improves that the voltage dividing branch circuit comprises a first voltage dividing unit and a second voltage dividing unit which are connected in series, wherein the first end of the first voltage dividing unit is connected to the positive bus, the second end of the first voltage dividing unit is respectively connected with the first end of the second voltage dividing unit, the first end of the clamping protection branch circuit and the discharging branch circuit, and the second end of the second voltage dividing unit is connected to the negative bus.
A further development of the utility model is that the first voltage dividing unit comprises a number of resistors connected in series.
The utility model also provides an inverter, an inverter device and the bus residual voltage discharging circuit, wherein the bus residual voltage discharging circuit is connected with an auxiliary power supply, a positive bus and a negative bus of the inverter device.
Compared with the prior art, the utility model has the beneficial effects that: the optocoupler is connected with an auxiliary power supply of the equipment so as to be used for detecting whether the auxiliary power supply is powered down or not and starting the discharge branch circuit when the auxiliary power supply is powered down; when the equipment is normally started, a switching tube in the discharge branch is closed; when the equipment is turned off/auxiliary power is turned off, the switching tube in the discharging branch is turned on, so that the discharging resistor in the discharging branch is switched into a bus loop of the equipment, and the bus voltage of the equipment can be automatically and rapidly discharged until the switching tube is turned off. Therefore, the utility model can realize automatic discharge when the equipment is turned off/auxiliary power is turned off through the circuit structure with optimal design, provides a good hardware circuit foundation for automatic discharge of the equipment such as the photovoltaic inverter and the like, does not need to increase control signals, and has simple and efficient circuit structure.
Drawings
Fig. 1 is a schematic diagram of a circuit structure according to an embodiment of the present utility model.
The attached drawings are identified: 1-an optical coupler; 2-a partial pressure branch; 201-a first voltage dividing unit; 202-a second voltage division unit; 3-clamping protection branches; 4-a discharge branch; 401-a first discharge unit; 402-fuses; 403-second discharge cell.
Detailed Description
Preferred embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.
In the description of the present utility model, if a certain technical feature is referred to as "disposed", "fixed", "connected" or "mounted" on another technical feature, it should be understood that the technical feature is directly disposed, fixed or connected to another technical feature, or may be indirectly disposed, fixed or connected or mounted on another technical feature.
In the description of the utility model, if reference is made to "a number", it means more than one; if "a plurality" is referred to, it means more than two; if "greater than", "less than", "exceeding" are referred to, they are understood to not include the present number; references to "above," "below," "within," and "within" are to be construed as including the present number. If reference is made to "first," "second," etc., it is to be understood that the same or similar technical feature names are used only for distinguishing between them, and it is not to be understood that the relative importance of a technical feature is implied or indicated, or that the number of technical features is implied or indicated, or that the precedence of technical features is implied or indicated.
As shown in fig. 1, the present embodiment provides a bus residual voltage discharging circuit, including: the device comprises an optical coupler 1, a voltage dividing branch 2, a clamping protection branch 3 and a discharging branch 4, wherein a first end of the optical coupler 1 is connected to an auxiliary power supply of the device, a second end of the optical coupler 1 is connected to the clamping protection branch 3 and the discharging branch 4 through the voltage dividing branch 2, a first end of the voltage dividing branch 2 and a first end of the discharging branch 4 are connected to a positive BUS BUS+ of the device, and a second end of the voltage dividing branch 2 and a second end of the discharging branch 4 are connected to a negative BUS BUS-of the device. The apparatus refers to an inverter apparatus.
Optionally, as shown in fig. 1, in this embodiment, a first end of the optocoupler 1 is connected to VCC, and a second end of the optocoupler 1 is connected to the clamp protection branch 3 and the discharge branch 4 through the voltage dividing branch 2. In this embodiment, the clamp protection branch 3 includes a zener diode Z1, where an anode of the zener diode Z1 is connected to the negative BUS bar-, a cathode of the zener diode Z1 is connected to a clamp connection point of the discharge branch 4, and the clamp connection point refers to a connection point of the discharge branch 4 and the optocoupler 1, and the voltage division branch 2, that is, a connection point between a gate of the switching tube Q1 and a cathode of the zener diode Z1. The voltage stabilizing diode Z1 is adopted to realize the clamping protection branch 3 in the embodiment, and the effect of the voltage stabilizing diode Z1 is that the GS voltage in the switching tube Q1 is stabilized through the clamping protection effect when the power is turned off for the high-voltage auxiliary power supply of the bus, so that the damage of the switching tube Q1 is avoided.
As shown in fig. 1, the discharging branch 4 in this embodiment includes a switching tube Q1, a gate of the switching tube Q1 is connected to a first end of the clamping protection branch 3, the voltage division branch 2, and the optocoupler 1, and a source of the switching tube Q1 and a second end of the clamping protection branch 3 are connected to a negative BUS-.
Optionally, as shown in fig. 1, the discharging branch 4 of the present embodiment further includes a first discharging unit 401, a fuse 402, and a second discharging unit 403, where a first end of the first discharging unit 401 is connected to a positive BUS bar+, a second end of the first discharging unit 401 is connected to a first end of the second discharging unit 403 through the fuse 402, and a second end of the second discharging unit 403 is connected to a drain of the switching tube Q1. In this embodiment, the first discharging unit 401 and the second discharging unit 403 each include a plurality of parallel discharging resistors, in fig. 1, the first discharging unit 401 includes a series discharging resistor R6 and a series discharging resistor R7, and the second discharging unit 402 includes a series discharging resistor R8 and a series discharging resistor R9. The embodiment is designed by a plurality of discharge resistors based on the power consumption factors of the discharge resistors, and the power consumption is larger because the resistance value of the discharge resistor is smaller. Of course, in practical application, the number of discharge resistors can be set and adjusted according to the power consumption of the resistors and the package.
Alternatively, the fuse 402 of the present embodiment employs a recoverable thermal fuse F1. In this embodiment, the fuse 402 is disposed between the first discharging unit 401 and the second discharging unit 403, and when the temperature of the resistor is too high in a special case, the recoverable thermal fuse F1 will be disconnected, and the discharging is stopped, so as to avoid the damage of the resistor due to overheating.
In this embodiment, the optocoupler 1 is connected to an auxiliary power supply of the device, so as to be used for detecting whether the auxiliary power supply is powered down, and opening the discharge branch when the auxiliary power supply is powered down; optionally, the device includes a photovoltaic inverter device such as an inverter. When the device is normally started, namely auxiliary power is started, the GS voltage (namely the voltage between the grid electrode and the source electrode) of the switching tube Q1 connected with the second end of the optical coupler 1 is pulled to 0V, and the switching tube in the discharging branch 4 is closed; when the equipment is turned off/power is turned off, the first end connected with VCC by the optocoupler 1 drops from 5V to 0V, at this time, as shown in fig. 1, by the voltage division of the voltage division branch 2, the voltage at two ends of the zener diode Z1 in the clamp protection branch 3 is used as the GS voltage of the MOS tube, the GS voltage reaches the turn-on voltage of the switching tube Q1, and the switching tube Q1 in the discharge branch 4 is turned on, so that the bus voltage remaining in the equipment can be automatically and quickly discharged until the switching tube is turned off by switching the discharge resistor in the discharge branch 4 into the bus loop of the equipment. Therefore, the embodiment can realize automatic discharge when the equipment is turned off/auxiliary power is turned off through the circuit structure with optimal design, and a control signal is not required to be added, so that the circuit structure is simple and efficient.
Optionally, as shown in fig. 1, the voltage dividing branch 2 in this embodiment includes a first voltage dividing unit 201 and a second voltage dividing unit 202 connected in series, where a first end of the first voltage dividing unit 201 is connected to a positive BUS bar+, a second end of the first voltage dividing unit 201 is respectively connected to a first end of the second voltage dividing unit 202, a first end of the clamp protection branch 3, and the discharge branch 4, and a second end of the second voltage dividing unit 202 is connected to a negative BUS bar.
Optionally, in this embodiment, the first voltage dividing unit 201 includes a plurality of resistors connected in series, and the first voltage dividing unit 201 includes a resistor R2, a resistor R3, a resistor R4, and a resistor R5 connected in series; the reason why the second voltage dividing unit 202 includes the resistor R1 in this embodiment adopts a plurality of resistors to realize voltage division is that when the chip resistor is used, the withstand voltage and the resistance power consumption of a single resistor are limited; of course, in practical application, the number of resistors can be set and adjusted in a self-defined manner according to practical situations and requirements.
Optionally, the circuit shown in fig. 1 may be matched with the value of the voltage dividing resistor of the gate of the switching tube Q1 in advance, and since the turn-on voltage of the switching tube Q1 is about 5V, the circuit shown in fig. 1 may discharge the bus voltage to below 30V as the safety voltage. In the voltage dividing branch 2, the selection of each resistor can be based on the following, taking the discharging of the bus voltage to 30V as an example, and the starting voltage of the switch tube Q1 is about 5V, so that the resistor satisfies the formulaAnd (3) obtaining the product. Of course, the actual resistance parameter determination may be determined based on the selected resistor package and power consumption, as described herein only as a complement to the operating principle and its parameter settings.
The present embodiment also provides an inverter including: an inverter device and a BUS residual voltage discharging circuit as described above, the BUS residual voltage discharging circuit and an auxiliary power supply of the inverter device, a positive BUS bus+ and a negative BUS-connection. The inverter device in this embodiment is one form of the above-mentioned device, and the bus residual voltage discharging circuit is configured to discharge the bus residual voltage of the inverter device when the auxiliary power supply of the inverter device is powered down, so that the specific implementation manner is as described above, and will not be described herein.
The above embodiments are preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, which is defined by the appended claims, but rather by the following claims.
Claims (7)
1. A bus bar residual voltage discharge circuit, comprising: the device comprises an optical coupler, a voltage dividing branch, a clamping protection branch and a discharging branch, wherein a first end of the optical coupler is connected to an auxiliary power supply of the device, a second end of the optical coupler is connected to the clamping protection branch and the discharging branch through the voltage dividing branch, a first end of the voltage dividing branch and a first end of the discharging branch are connected to a positive bus of the device, and a second end of the voltage dividing branch and a second end of the discharging branch are connected to a negative bus of the device;
the voltage division branch circuit comprises a first voltage division unit and a second voltage division unit which are connected in series, wherein the first end of the first voltage division unit is connected to the positive bus, the second end of the first voltage division unit is respectively connected with the first end of the second voltage division unit, the first end of the clamping protection branch circuit and the discharging branch circuit, the second end of the second voltage division unit is connected to the negative bus, and the first voltage division unit comprises a resistor R2, a resistor R3, a resistor R4 and a resistor R5 which are connected in series; the second voltage division unit comprises a resistor R1, and the resistance relationships among the resistor R1, the resistor R2, the resistor R3, the resistor R4 and the resistor R5 are as follows:。
2. the bus bar residual voltage discharging circuit according to claim 1, wherein the discharging branch circuit comprises a switching tube, a gate of the switching tube is respectively connected with the first end of the clamping protection branch circuit, the voltage dividing branch circuit and the optocoupler, and a source of the switching tube and a second end of the clamping protection branch circuit are connected to a negative bus bar.
3. The bus bar residual voltage discharge circuit of claim 2, wherein the discharge branch further comprises a first discharge unit, a fuse, and a second discharge unit, a first end of the first discharge unit being connected to the positive bus bar, a second end of the first discharge unit being connected to a first end of the second discharge unit through the fuse, a second end of the second discharge unit being connected to a drain of the switching tube.
4. The bus bar residual voltage discharge circuit of claim 3 wherein the first discharge cell and the second discharge cell each comprise a plurality of discharge resistors connected in parallel.
5. The bus bar residual voltage discharge circuit of claim 3 wherein the fuse is a recoverable thermal fuse.
6. The bus bar residual voltage discharge circuit of any one of claims 1 to 5, wherein the clamp protection branch comprises a zener diode, an anode of the zener diode is connected to the negative bus bar, a cathode of the zener diode is connected to a clamp connection point of the discharge branch, and the clamp connection point is a connection point of the discharge branch to the optocoupler and the voltage dividing branch.
7. An inverter, comprising: an inverter device; and the bus bar residual voltage discharging circuit according to any one of claims 1 to 6, which is connected with an auxiliary power supply, a positive bus bar, and a negative bus bar of the inverter apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223381868.XU CN219802149U (en) | 2022-12-16 | 2022-12-16 | Bus residual voltage discharging circuit and inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223381868.XU CN219802149U (en) | 2022-12-16 | 2022-12-16 | Bus residual voltage discharging circuit and inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219802149U true CN219802149U (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223381868.XU Active CN219802149U (en) | 2022-12-16 | 2022-12-16 | Bus residual voltage discharging circuit and inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219802149U (en) |
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2022
- 2022-12-16 CN CN202223381868.XU patent/CN219802149U/en active Active
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