CN209913709U - Economical isolated high-voltage direct-current switching circuit - Google Patents
Economical isolated high-voltage direct-current switching circuit Download PDFInfo
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- CN209913709U CN209913709U CN201921024312.0U CN201921024312U CN209913709U CN 209913709 U CN209913709 U CN 209913709U CN 201921024312 U CN201921024312 U CN 201921024312U CN 209913709 U CN209913709 U CN 209913709U
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Abstract
An economical isolated high-voltage direct-current switching circuit belongs to the technical field of circuit control. The IGBT power circuit comprises control switches K1, K2, K3 and an IGBT module Q1, wherein the control switch K3 is connected in series between a negative input end VIN and a negative output end VOUT, the control switches K2 and K1 are connected in series between a positive input end VIN + and a positive output end VOUT +, and a C pole and an E pole of the IGBT module Q1 are connected in parallel at two ends of the control switch K2; the IGBT driving circuit is connected with an IGBT module Q1. The utility model discloses the circuit scale is less, and drive circuit and power circuit keep apart completely, can be long-time, safe, reliable work, are particularly suitable for as the power distribution unit circuit who fills electric pile, can strengthen the flexibility and the reliability of charging greatly.
Description
Technical Field
The utility model belongs to the technical field of circuit control, specifically be an economical isolated high voltage direct current switching circuit.
Background
At present, a direct current contactor is generally adopted in the market to realize the switching of high-power high-voltage direct current, but the price of the direct current contactor is relatively high. For some industrial electrical equipment used in a large scale, the cost performance is a key factor for improving competitiveness on the premise of meeting safety.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an economical isolated high voltage direct current switching circuit which can effectively solve the problems in the background technology,
the technical scheme for realizing the purpose is as follows: an economical isolated high-voltage direct-current switching circuit comprises an IGBT driving circuit and a power circuit connected in series with the high-voltage direct-current circuit, wherein the power circuit comprises a positive input end VIN +, a positive output end VOUT +, a negative input end VIN-, a negative output end VOUT-, a control switch K1, a control switch K2, a control switch K3 and an IGBT module Q1, the control switch K3 is connected in series between the negative input end VIN-and the negative output end VOUT-, the control switches K2 and K1 are connected in series between the positive input end VIN + and the positive output end VOUT +, and a C pole and an E pole of the IGBT module Q1 are connected in parallel at two ends of the control switch K2; the IGBT driving circuit is connected with the IGBT module Q1 and used for sending driving signals to the IGBT module Q1.
The utility model has the advantages that:
the utility model discloses the circuit scale is less, and drive circuit and power circuit keep apart completely, can be long-time, safe, reliable work, compare with direct current contactor and have very strong price/performance ratio advantage. The power distribution unit circuit is particularly suitable for serving as a power distribution unit circuit of a charging pile, and the charging flexibility and reliability can be greatly enhanced on the premise of not increasing the cost remarkably.
Further, the IGBT driving circuit includes diodes D1, D2, a resistor R5, a capacitor C1, and an isolation transformer TS1, a center tap C end is provided between an a end and a B end of a primary coil of the isolation transformer TS1, a center tap C end is provided between an a end and a B end of a secondary coil of the isolation transformer TS1, a B end and a C end of a primary coil of the isolation transformer TS1 are connected to a driving signal, an a end and a B end of a secondary coil of the isolation transformer TS1 output ac voltage, which is full-wave rectified by a diode D1 and a diode D2, and then connected to one end of a resistor R5, the other end of the resistor R5 is connected to a G pole of the IGBT module Q1, one end of the capacitor C1 is connected to a G pole of the IGBT module Q1, and the other end is respectively connected to a C end of a secondary coil of the isolation transformer TS.
The driving signal of the primary end of the isolation transformer TS1 is an alternating current signal with certain frequency and amplitude, and is converted into a direct current signal capable of driving the IGBT module Q1 after secondary voltage reduction and rectification so as to control the on-off of the IGBT module Q1, and the frequency and the amplitude of the primary signal of the isolation transformer TS1 are determined according to the actually used parameters of the isolation transformer TS1 and the driving requirement of the IGBT module Q1.
Since the center tap of the isolation transformer TS1 is connected to the output of the power circuit, the IGBT module Q1 can operate reliably and safely when the IGBT module Q1 is turned on and off (the voltage across G, E poles of the IGBT module Q1 is the rectified driving voltage regardless of the on and off periods of the IGBT module Q1).
The diodes D1, D2, the resistor R5 and the capacitor C1 form a rectifying circuit, a secondary alternating current signal of the isolation transformer TS1 is rectified into a direct current signal to stably drive the IGBT module Q1, and the values of the resistor R5 and the capacitor C1 are determined by IGBT parameters and a driving signal together.
Further, a resistor R4 is connected between the G pole and the E pole of the IGBT module Q1; because a certain capacitance exists between the G pole and the E pole of the IGBT device, the added resistor R4 can be used as a damping network to restrain possible abnormal oscillation of the G pole of the IGBT module Q1; also functions to protect the module Q1 to some extent and ensures that the module Q1 is reliably turned off when the G-pole drive signal is turned off.
Further, the control switches K1, K2 and K3 are all magnetic holding contactors.
Drawings
Fig. 1 is a working principle diagram of the present invention.
Detailed Description
As shown in fig. 1, the utility model comprises an IGBT driving circuit 1 and a power circuit 2 connected in series on the high voltage dc circuit.
The power circuit 2 comprises a positive input end VIN +, a positive output end VOUT +, a negative input end VIN-, a negative output end VOUT-, a control switch K1, K2, K3 and an IGBT module Q1, wherein the control switch K3 is connected in series between the negative input end VIN-and the negative output end VOUT-, the control switches K2 and K1 are connected in series between the positive input end VIN + and the positive output end VOUT +, and the C pole and the E pole of the IGBT module Q1 are connected to two ends of the control switch K2 in parallel.
As a further description of the present embodiment, the control switches K1, K2, and K3 in the present embodiment are all but not limited to adopt magnetic latching contactors.
The IGBT driving circuit is connected with an IGBT module Q1, the IGBT driving circuit comprises diodes D1, D2, a resistor R5, a capacitor C1 and an isolation transformer TS1, a center tap C end is arranged between an A end and a B end of a primary coil of the isolation transformer TS1, a center tap C end is arranged between an a end and a B end of a secondary coil of the isolation transformer TS1, a B end and a C end of a primary coil of the isolation transformer TS1 are connected with driving signals, an a end and a B end of a secondary coil of the isolation transformer TS1 output alternating voltages, the alternating voltages are subjected to full-wave rectification through a diode D1 and a diode D2 and then connected with one end of a resistor R5, an anode of a diode D1 is connected with an a end of a secondary coil of the isolation transformer TS1, an anode of a diode D2 is connected with a B end of a secondary coil of the isolation transformer TS1, cathodes of the diodes D1 and D2 are connected with a resistor R5, the other end of the resistor R5 is connected with a G pole of the IGBT module Q596, The other end of the isolation transformer TS1 is connected with the c end of the secondary coil of the isolation transformer TS1 and the E pole of the IGBT module Q1, and a resistor R4 is connected between the G pole and the E pole of the IGBT module Q1.
The driving signal of the primary end of the isolation transformer TS1 is an alternating current signal with certain frequency and amplitude, and is converted into a direct current signal capable of driving the IGBT module Q1 after secondary voltage reduction and rectification so as to control the on-off of the IGBT module Q1, and the frequency and the amplitude of the primary signal of the isolation transformer TS1 are determined according to the actually used parameters of the isolation transformer TS1 and the driving requirement of the IGBT module Q1.
The terminal c of the secondary winding of the isolation transformer TS1 is connected to the output of the power circuit, so that the IGBT module Q1 can operate reliably and safely when the IGBT module Q1 is turned on and off (no matter whether the IGBT module Q1 is on or off, the voltage between G, E poles of the IGBT module Q1 is the rectified driving voltage).
The diodes D1, D2, the resistor R5 and the capacitor C1 form a rectifying circuit, a secondary alternating current signal of the isolation transformer TS1 is rectified into a direct current signal to stably drive the IGBT module Q1, and the values of the resistor R5 and the capacitor C1 are determined by IGBT parameters and a driving signal together.
The utility model discloses a theory of operation:
1) the switching logic of the circuit from the off state to the on state is as follows: the control switches K1 and K3 are driven to be closed, then the IGBT module Q1 is driven to be in saturated conduction, and finally the control switch K2 is driven to be closed.
The use of the IGBT module Q1 makes it possible to operate the control switches K1, K2, K3 safely in high-voltage circuits, while reducing the requirements on the withstand voltage of the control switches K1, K2, K3.
2) The switching logic of the circuit from the closed state to the open state is as follows: the control switch K2 is driven to be disconnected, the IGBT module Q1 is driven to be cut off, and the control switches K1 and K3 are driven to be disconnected. The control switches K1, K2 and K3 are well protected.
The relative timing of operations is based on the parameters and specific application of the actual device. In practical use, in order to increase the reliability of the circuit, the monitoring of key points in the circuit can be considered, but the key points are ensured to be isolated from the power circuit.
Claims (4)
1. The utility model provides an economic isolated high voltage direct current switching circuit which characterized in that: the IGBT power circuit comprises a positive electrode input end VIN +, a positive electrode output end VOUT +, a negative electrode input end VIN-, a negative electrode output end VOUT-, a control switch K1, K2, K3 and an IGBT module Q1, wherein the control switch K3 is connected between the negative electrode input end VIN-and the negative electrode output end VOUT-, the control switches K2 and K1 are connected between the positive electrode input end VIN + and the positive electrode output end VOUT +, and a C electrode and an E electrode of the IGBT module Q1 are connected with two ends of a control switch K2 in parallel; the IGBT driving circuit is connected with the IGBT module Q1 and used for sending driving signals to the IGBT module Q1.
2. The isolated economic high-voltage direct current switching circuit according to claim 1, wherein: the IGBT driving circuit comprises diodes D1 and D2, a resistor R5, a capacitor C1 and an isolation transformer TS1, a middle tap C end is arranged between an A end and a B end of a primary coil of the isolation transformer TS1, a middle tap C end is arranged between an a end and a B end of a secondary coil of the isolation transformer TS1, the B end and the C end of the primary coil of the isolation transformer TS1 are connected with driving signals, alternating-current voltages output by the a end and the B end of the secondary coil of the isolation transformer TS1 are connected with one end of a resistor R5 after being subjected to full-wave rectification through a diode D1 and a diode D2, the other end of the resistor R5 is connected with a G pole of an IGBT module Q1, one end of the capacitor C1 is connected with the G pole of the IGBT module Q1, and the other end of the capacitor C is respectively connected with the C end of the secondary.
3. An economical isolated HVDC switching circuit according to claim 2, further comprising: and a resistor R4 is connected between the G pole and the E pole of the IGBT module Q1.
4. The isolated economic high-voltage direct current switching circuit according to claim 1, wherein: the control switches K1, K2 and K3 all adopt magnetic latching contactors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921024312.0U CN209913709U (en) | 2019-07-03 | 2019-07-03 | Economical isolated high-voltage direct-current switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921024312.0U CN209913709U (en) | 2019-07-03 | 2019-07-03 | Economical isolated high-voltage direct-current switching circuit |
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| CN209913709U true CN209913709U (en) | 2020-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277924A (en) * | 2019-07-03 | 2019-09-24 | 上海鼎充新能源技术有限公司 | A kind of economical isolated high-voltage DC switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277924A (en) * | 2019-07-03 | 2019-09-24 | 上海鼎充新能源技术有限公司 | A kind of economical isolated high-voltage DC switching circuit |
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Effective date of registration: 20240806 Address after: 215200 No. 18 Suzhou River Road, Songling Town, Wujiang District, Suzhou, Jiangsu Patentee after: Hengtong Huichong Zhonglian Technology Co.,Ltd. Country or region after: China Address before: 201600 Songjiang District, Shanghai, Xinzhu Road, No. 518, 24, 6, Songjiang science and technology city. Patentee before: SHANGHAI TOPOWER NEW ENERGY TECHNOLOGY CO.,LTD. Country or region before: China |