CN210898929U - Direct current bus discharge circuit - Google Patents
Direct current bus discharge circuit Download PDFInfo
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- CN210898929U CN210898929U CN201922124804.3U CN201922124804U CN210898929U CN 210898929 U CN210898929 U CN 210898929U CN 201922124804 U CN201922124804 U CN 201922124804U CN 210898929 U CN210898929 U CN 210898929U
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Abstract
A direct current bus discharging circuit comprises at least one discharging module, wherein the discharging module comprises an optical coupler, a voltage stabilizing diode, a discharging resistor and a switching tube, the anode of the primary side input end of the optical coupler is connected with a power supply, the cathode of the primary side input end of the optical coupler is grounded, the collector of the secondary side output end of the optical coupler is connected with the first end of the discharging module and the cathode of the voltage stabilizing diode, the emitter of the secondary side output end of the discharging module is connected with the second end of the discharging module and the anode of the voltage stabilizing diode, the first end of the switching tube is connected with the cathode of the voltage stabilizing diode, the second end of the switching tube is connected with the first end of the discharging module through the. Implement the utility model discloses a direct current bus discharge circuit can promote system's efficiency, reduces the risk of damaging the device, and the circuit is simple reliable and easily realize moreover.
Description
Technical Field
The utility model relates to a converter field of discharging, more specifically says, relates to a direct current generating line discharge circuit.
Background
The converter commonly used at present, such as a frequency converter, a UPS, a photovoltaic inverter, a wind power converter and the like, is provided with a direct current bus. The direct current bus generally adopts a high-power capacitor as an energy storage element. In order to ensure the safety of the operation of the equipment, the energy stored in the dc bus capacitor after the equipment is powered off is required to be released quickly, and therefore, a discharge resistor is generally connected in parallel at two ends of the dc bus capacitor. Fig. 1 shows a prior art DC bus discharge circuit for an AC/DC/AC converter without N-wires, which typically includes a discharge resistor R disposed across a DC bus capacitor, Vdc + and Vdc-. Fig. 2 shows a prior art DC bus discharge circuit for an AC/DC/AC converter with N lines, which typically includes discharge resistors R1 and R2 disposed across two DC bus capacitors, namely Vdc + and N lines and N and Vdc-, respectively.
However, in the dc bus discharging circuit shown in fig. 1-2, since the discharging resistor is always connected in parallel to both ends of the dc bus capacitor, when the converter is in normal operation, the discharging resistor has large power consumption and heat generation, which reduces the system efficiency, and also raises the ambient temperature around the bus capacitor, which easily causes device damage.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide one kind and can promote system efficiency, reduce the risk of damaging the device, the circuit is simple reliable and easily realize direct current generating line discharge circuit.
The utility model provides a technical scheme that its technical problem adopted is: a direct-current bus discharging circuit is constructed and comprises at least one discharging module, wherein the discharging module comprises an optical coupler, a voltage stabilizing diode, a discharging resistor and a switching tube, the anode of the primary side input end of the optical coupler is connected with a power supply, the cathode of the primary side input end of the optical coupler is grounded, the collector of the secondary side output end of the optical coupler is connected with the first end of the discharging module and the cathode of the voltage stabilizing diode, the emitter of the secondary side output end of the discharging module is connected with the second end of the discharging module and the anode of the voltage stabilizing diode, the first end of the switching tube is connected with the cathode of the voltage stabilizing diode, the second end of the switching tube is connected with the first end of the.
Direct current bus discharge circuit in, further including setting up the first end of the module of discharging with current-limiting resistance module between the secondary output collecting electrode of opto-coupler.
In the dc bus discharging circuit of the present invention, the current-limiting resistor module includes a plurality of series resistors.
DC bus discharge circuit in, further including setting up the secondary output collecting electrode of opto-coupler with driving resistance between the first end of switch tube.
Direct current bus discharge circuit in, further including setting up the secondary output collecting electrode of opto-coupler with discharge the first filter capacitance between the second end of module.
In the dc bus discharging circuit of the present invention, the first end of the switch tube and the second end of the discharging module are connected to each other via a second filter capacitor.
The dc bus discharging circuit of the present invention further comprises a primary side current limiting resistor disposed between the primary side input terminal anode of the optocoupler and the power supply.
In the dc bus discharging circuit of the present invention, the primary side filter capacitor between the power supply and the ground is further included.
In the dc bus discharging circuit of the present invention, the discharging module is connected to the first end of the converter, and the second end of the discharging module is connected to the second end of the converter.
In the dc bus discharging circuit of the present invention, the first discharging module and the second discharging module are included, the first end of the first discharging module is connected to the first end of the converter, the second end of the first discharging module is connected to the third end of the converter, the first end of the second discharging module is connected to the third end of the converter, and the second end of the second discharging module is connected to the second end of the converter.
Implement the utility model discloses a direct current generating line discharge circuit through increasing switch tube and opto-coupler, can switch on and break off the discharge resistance and be connected with direct current generating line to can realize discharging for direct current generating line rapidly after the outage, break off the discharge resistance and be connected with direct current generating line at normal during operation, thereby promote system efficiency, reduce the risk of damaging the device, the circuit is simple reliable and easily realize moreover.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 shows a prior art DC bus discharge circuit without an N-wire AC/DC/AC converter;
FIG. 2 shows a prior art DC bus discharge circuit with an N-wire AC/DC/AC converter;
fig. 3 shows a schematic circuit diagram of a dc bus discharge circuit of a preferred embodiment of the present invention;
fig. 4 shows a schematic circuit diagram of a DC bus discharging circuit of another preferred embodiment of the present invention, which is suitable for an AC/DC/AC converter without N lines;
fig. 5 shows a schematic circuit diagram of a DC bus discharging circuit of another preferred embodiment of the present invention, which is suitable for an AC/DC/AC converter with N lines.
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.
The utility model discloses a direct current bus discharge circuit, including at least one module of discharging, the module of discharging includes opto-coupler, zener diode, discharge resistance and switch tube, the former limit input positive pole of opto-coupler is connected power, former limit input negative pole ground connection, vice limit output collecting electrode and is connected the first end of the module of discharging with zener diode's negative pole, vice limit output projecting pole are connected the second end of the module of discharging with zener diode's positive pole, the first end of switch tube is connected zener diode's negative pole, second end warp discharge resistance connects the first end of the module of discharging, third end are connected the second end of the module of discharging. Implement the utility model discloses a direct current generating line discharge circuit through increasing switch tube and opto-coupler, can switch on and break off the discharge resistance and be connected with direct current generating line to can realize discharging for direct current generating line rapidly after the outage, break off the discharge resistance and be connected with direct current generating line at normal during operation, thereby promote system efficiency, reduce the risk of damaging the device, the circuit is simple reliable and easily realize moreover.
Fig. 3 shows a schematic circuit diagram of a dc bus discharging circuit according to a preferred embodiment of the present invention. As shown in fig. 3, the dc bus discharging circuit of the present invention includes at least one discharging module 100. The discharging module 100 comprises an optocoupler U1, a voltage regulator diode D1, a discharging resistor R-1 and a switch tube Q1, wherein the anode of the primary side input end of the optocoupler U1 is connected with a power supply P, the cathode of the primary side input end is grounded GND, the collector of the secondary side output end is connected with the first end of the discharging module and the cathode of the voltage regulator diode D1, the emitter of the secondary side output end is connected with the second end of the discharging module and the anode of the voltage regulator diode D1, the first end of the switch tube Q1 is connected with the cathode of the voltage regulator diode D1, the second end is connected with the first end A of the discharging module 100 through the discharging resistor R-1, and the third end is connected with the second end B of the. In the preferred embodiment of the present invention, the switching tube Q1 may be a MOSFET tube, an IGBT tube, an IGCT tube, or the like.
In actual operation, for the direct current bus discharging circuit of the AC/DC/AC converter without N lines as shown in FIG. 1, a discharging module 100 is provided, a first end A of the discharging module 100 is connected with a Vdc + end of the AC/DC/AC converter, and a second end B of the discharging module is connected with a Vdc-end of the AC/DC/AC converter. In the DC bus discharging circuit of the AC/DC/AC inverter having N lines as shown in fig. 2, two discharging modules 100 are provided, a first terminal a of the first discharging module 100 is connected to the Vdc + terminal of the AC/DC/AC inverter, a second terminal B is connected to the N line terminal of the AC/DC/AC inverter, a first terminal a of the second discharging module 100 is connected to the N line terminal of the AC/DC/AC inverter, and a second terminal B is connected to the Vdc-terminal of the AC/DC/AC inverter.
When the converter normally works, the voltage of an internal direct-current bus is established, the power supply P outputs +15V voltage, at the moment, a primary side diode of the optocoupler U1 is conducted, the switch tube Q1 is not conducted, and the discharge resistor R-1 has no power consumption.
When the converter is powered off, the direct current bus capacitor still has residual energy, the power supply P can still output continuously, and the working condition at the moment is the same as that in normal working, and the energy of the bus capacitor is consumed by the power supply P and the load thereof. When the voltage of the direct current bus is lower than the working voltage of the power supply P, the output voltage +15V of the power supply P is interrupted, the primary side diode of the optocoupler U1 cannot be conducted at the moment, the secondary side output of the optocoupler is also turned off, the switch tube Q1 is conducted at the moment, the discharge resistor R-1 is connected into a discharge loop, and the residual energy of the direct current bus is quickly released by the discharge resistor R-1.
Therefore, implement the utility model discloses a direct current generating line discharge circuit through increasing switch tube and opto-coupler, can switch on and break off discharge resistance and direct current generating line's being connected to can realize discharging for direct current generating line rapidly after the outage, break off discharge resistance and direct current generating line's being connected when normal work, thereby promote system efficiency, reduce the risk of damaging the device, the circuit is simple reliable and easily realize moreover.
Fig. 4 shows a schematic circuit diagram of a DC bus discharging circuit of another preferred embodiment of the present invention, which is suitable for an AC/DC/AC converter without N lines. As shown in fig. 4, the discharging module 100 includes an optocoupler U1, a zener diode D1, a discharging resistor R-1, a switching tube Q1, a current limiting module formed by serially connecting current limiting resistors R11-R15, filter capacitors C2-C3, a primary side filter capacitor C1, a primary side current limiting resistor R1, and a driving resistor R2. As shown in fig. 4, the anode of the primary input end of the optocoupler U1 is connected to the power supply P and the cathode of the primary input end is grounded GND through a primary current limiting resistor R1. A primary filter capacitor C1 is arranged between the power supply P and ground GND. And a collector of a secondary output end of the optocoupler U1 is sequentially connected with a first end A of the discharge module through current limiting resistors R11-R15. An emitter of a secondary output end of the optical coupler U1 is connected with the second end B of the discharge module and the anode of the voltage stabilizing diode D1. The collector of the secondary output end of the optocoupler U1 is also connected with the cathode of the voltage regulator diode D1 and is connected with the grid of the switching tube Q1 through a driving resistor R2. The source of the switching tube Q1 is connected to the second end B of the discharging module. The gate of the switching tube Q1 is connected to the first terminal a of the discharge module 100 via the discharge resistor R-1. The first filter capacitor C2 is arranged between the collector of the secondary output end of the optocoupler U1 and the second end B of the discharging module. The second filter capacitor C3 is disposed between the source of the switching tube and the second end B of the discharge module.
In the preferred embodiment of the present invention, the current limiting resistors R11-R15 are preferably current limiting resistors with large resistance. Those skilled in the art will appreciate that the number of the current limiting resistors R11-R15 may be set according to actual needs, for example, 3, 4 or 6, 7, or even 10 or 20, and the resistors may be connected in any series or parallel manner. The power supply P can be 15V, and can also be different output power supplies of +5V/+12V/+24V/+ 48V. The discharge resistor R-1 can refer to a single resistor, and a plurality of resistors are connected in series or in parallel. The driving resistor R2 and the second filter capacitor C3 are a gate driving resistor and a gate filter capacitor of the switching tube Q1, which may take any other form. It is understood by those skilled in the art that although the present invention is described with reference to an AC/DC/AC converter, those skilled in the art will appreciate that the DC bus discharging circuit of the present invention can be applied to any converter, such as an AC/DC converter, a DC/AC/DC converter, etc.
In the present embodiment, in actual operation, for the DC bus discharging circuit of the AC/DC/AC converter without N lines as shown in fig. 1, the discharging module 100 is provided, the first terminal a of the discharging module 100 is connected to the Vdc + terminal of the AC/DC/AC converter, and the second terminal B of the discharging module is connected to the Vdc-terminal of the AC/DC/AC converter. The working principle is as follows:
when the converter normally works, voltages at two ends of an internal direct current bus are established, a power supply P outputs +15V voltage, a primary side diode of an optocoupler U1 is conducted, the voltage at the output end of a secondary side of the optocoupler U1 is about 0.7V, the voltages at Vdc +/Vdc-ends are all added to R11, R12, R13, R14 and R15, the driving voltage of a switch tube Q1 is about 0.7V, the switch tube Q1 is not conducted, and a discharge resistor R-1 has no power consumption;
when the converter is powered off, the direct current bus capacitor still has residual energy, the power supply P can still output continuously, and the working condition at the moment is the same as that in normal working, and the energy of the bus capacitor is consumed by the power supply P and the load thereof. When the voltage of the direct current bus is lower than the P working voltage of the power supply, the P output voltage +15V of the power supply is interrupted, the primary side diode of the optocoupler U1 cannot be conducted at the moment, the secondary side output end of the optocoupler U1 is also turned off, the Vdc + end, the current limiting resistor R15, the R14, the R13, the R12, the R11, the D1 and the Vdc-end form a loop, the voltage of the capacitor C2 is about 15V, the switch tube Q1 is conducted at the moment, the discharging resistor R-1 is connected into the discharging loop, and the discharging resistor R-1 quickly releases the residual energy of the direct current bus.
Therefore, implement the utility model discloses a direct current bus discharge circuit, be different from the mode that adopts discharge resistance lug connection to direct current bus before usually, it can switch on and break off discharge resistance and direct current bus's being connected to have increased switch tube and opto-coupler between direct current bus and discharge resistance, thereby can realize discharging for direct current bus rapidly after the outage, break off discharge resistance and direct current bus's being connected when normal work, thereby promote system's efficiency, reduce the risk that damages the device, and the circuit is simple and reliable and easily realize moreover.
Fig. 5 shows a schematic circuit diagram of a DC bus discharging circuit of another preferred embodiment of the present invention, which is suitable for an AC/DC/AC converter with N lines. In the embodiment shown in fig. 5, the dc bus discharge circuit includes two discharge modules 100. Each discharge module 100 is identical to the embodiment shown in fig. 4. It will be appreciated by those skilled in the art that different discharge modules 100 may be used, such as any one of the discharge modules according to the embodiment shown in fig. 3 and one of the discharge modules according to any one of the embodiments shown in fig. 4.
As shown in fig. 5, the first terminal a of the first discharge module 100 is connected to the Vdc + terminal of the AC/DC/AC converter, the second terminal B is connected to the N-terminal of the AC/DC/AC converter, the first terminal a of the second discharge module 100 is connected to the N-terminal of the AC/DC/AC converter, and the second terminal B is connected to the Vdc-terminal of the AC/DC/AC converter.
For the embodiment shown in fig. 5, the principle and operation are as shown in fig. 4. Based on the teachings of the present invention, those skilled in the art are fully enabled to practice this embodiment and will not be reiterated here.
Therefore, implement the utility model discloses a direct current bus discharge circuit, be different from the mode that adopts discharge resistance lug connection to direct current bus before usually, it can switch on and break off discharge resistance and direct current bus's being connected to have increased switch tube and opto-coupler between direct current bus and discharge resistance, thereby can realize discharging for direct current bus rapidly after the outage, break off discharge resistance and direct current bus's being connected when normal work, thereby promote system's efficiency, reduce the risk that damages the device, and the circuit is simple and reliable and easily realize moreover.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like 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 direct current bus discharging circuit is characterized by comprising at least one discharging module, wherein the discharging module comprises an optical coupler, a voltage stabilizing diode, a discharging resistor and a switching tube, the anode of the primary side input end of the optical coupler is connected with a power supply, the cathode of the primary side input end of the optical coupler is grounded, the collector of the secondary side output end of the optical coupler is connected with the first end of the discharging module and the cathode of the voltage stabilizing diode, the emitter of the secondary side output end of the optical coupler is connected with the second end of the discharging module and the anode of the voltage stabilizing diode, the first end of the switching tube is connected with the cathode of the voltage stabilizing diode, the second end of the switching tube is connected with the first end of the discharging module through the.
2. The dc bus discharge circuit of claim 1, further comprising a current limiting resistance module disposed between the first end of the discharge module and a secondary output collector of the optocoupler.
3. The dc bus discharge circuit of claim 2, wherein the current limiting resistance module comprises a plurality of series resistors.
4. The dc bus discharge circuit of claim 1, further comprising a drive resistor disposed between a collector of a secondary output of the optocoupler and the first end of the switching tube.
5. The direct current bus discharging circuit of claim 4, further comprising a first filter capacitor disposed between a secondary output collector of the optocoupler and the second terminal of the discharging module.
6. The dc bus discharge circuit of claim 5, further comprising a second filter capacitor disposed between the first end of the switching tube and the second end of the discharge module.
7. The dc bus discharge circuit of claim 1, further comprising a primary current limiting resistor disposed between the anode of the primary input of the optocoupler and the power supply.
8. The dc bus discharge circuit of claim 7, further comprising a primary filter capacitor disposed between the power source and ground.
9. The dc bus discharge circuit of any of claims 1-8, comprising a discharge module having a first end coupled to the first end of the inverter and a second end coupled to the second end of the inverter.
10. The direct current bus discharge circuit of any one of claims 1 to 8, comprising a first discharge module and a second discharge module, wherein a first end of the first discharge module is connected to a first end of an inverter, a second end of the first discharge module is connected to a third end of the inverter, a first end of the second discharge module is connected to a third end of the inverter, and a second end of the second discharge module is connected to a second end of the inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922124804.3U CN210898929U (en) | 2019-12-02 | 2019-12-02 | Direct current bus discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922124804.3U CN210898929U (en) | 2019-12-02 | 2019-12-02 | Direct current bus discharge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210898929U true CN210898929U (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922124804.3U Active CN210898929U (en) | 2019-12-02 | 2019-12-02 | Direct current bus discharge circuit |
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|---|---|
| CN (1) | CN210898929U (en) |
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- 2019-12-02 CN CN201922124804.3U patent/CN210898929U/en active Active
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