CN204347208U - A kind of IGBT series connection brachium pontis performance testing device - Google Patents

Abstract

A performance test device for IGBT series bridge arm, comprising Boost circuit platform and tested component IGBT series bridge arm Arm, described Boost circuit platform, including input terminal voltage, filter capacitance of at least one input terminal, reactor, bridge arm connection positive Terminal P1, the bridge arm is connected to the negative terminal N1, the rectifier bridge arm, the filter capacitor at the output end, the load, and the voltmeter; the input voltage is connected in parallel with the filter capacitor at the input end, and the load is connected in parallel with the output end capacitor and the voltage indicator. The IGBT series bridge arm Arm includes two or more IGBT tubes used in series; the IGBT series bridge arm Arm is a detachable device under test. The utility model can test the static voltage equalization and dynamic voltage equalization of the IGBT series bridge arms. The utility model is close to reality, comprehensive in detection, simple and reliable, and low in cost.

Description

An IGBT series bridge arm performance test device

technical field

The utility model relates to the fields of power electronics, high-voltage frequency converters, high-voltage choppers and DC flexible power transmission, in particular to a performance testing device for IGBT series bridge arms.

Background technique

The IGBT series bridge arm has great application prospects in the fields of high-voltage frequency converters, high-voltage choppers, and DC flexible power transmission. At present, the insulated gate bipolar transistor (IGBT) series bridge arm has been applied in 3KV, 6KV, 10KV high-voltage inverters and high-voltage DC power supplies.

In actual production, a single IGBT series bridge arm must be tested first. After the test is completed, it can be installed into the whole machine for operation. The voltage equalization of the IGBT bridge arm includes static voltage equalization and dynamic voltage equalization. In the inverter circuit, the static voltage balance of the IGBT series bridge arm is determined by the bus voltage and the voltage of a single IGBT itself. The dynamic voltage equalization of the IGBT series bridge arm is determined by the difference of the IGBT itself, the difference of the auxiliary circuit, and the load current in the circuit.

The current IGBT series bridge arm detection system mainly uses the Buck step-down circuit detection method. The Buck step-down circuit detection method is to put the IGBT series bridge arm into the Buck circuit, and the IGBT series bridge arm replaces the switch tube of the Buck circuit. Although the form of the Buck circuit is very similar to the bridge arm in the inverter circuit, it also converts the bus voltage into a sine wave and other required voltages.

However, 1. The Buck circuit can only measure the switching characteristics of the IGBT bridge arms, but cannot test the freewheeling characteristics of the IGBT series bridge arms, and cannot ensure the dynamic voltage equalization characteristics of the IGBT series bridge arms. 2. In addition, the Buck circuit needs a high DC voltage as the input voltage, and the power is also very large. It must first have a DC power supply that provides high voltage and high power, resulting in high investment costs. 3. The input voltage and output voltage of the Buck circuit. The adjustable range of the voltage difference is small, and the voltage difference ΔV=Vin-Vout cannot test the dynamic characteristics of the IGBT series bridge arms under multiple different voltage differences.

Contents of the invention

In order to solve the above problems, the utility model provides an IGBT series bridge arm performance testing device. The utility model adopts the following technical scheme: an IGBT series bridge arm performance test device, including a Boost circuit platform and an IGBT series bridge arm.

The Boost circuit platform includes an input terminal voltage Uin, at least one input terminal filter capacitor Cin, a bridge arm connected to a positive terminal P1, a bridge arm connected to a negative terminal N1, reactors L1, L2, L3, DC circuit breakers K1, K2, K3, rectifier bridge arm D, load Load, at least one output filter capacitor Co and a voltage indicator V, the input voltage Uin is connected in parallel with the input filter capacitor Cin, the load Load is connected to the output filter capacitor Co and the voltage indicator V In parallel connection, one end of DC circuit breaker K1 is connected to the positive pole of input voltage Vin, the other end is connected to one end of reactor L1, the other end of reactor L1 is connected to the anode of rectifier bridge arm D, one end of DC circuit breaker K2 is connected to the positive pole of input voltage Vin The other end is connected to one end of the reactor L2, the other end of the reactor L2 is connected to the anode of the rectifier bridge arm D, one end of the DC circuit breaker K3 is connected to the positive pole of the input voltage Vin, and the other end is connected to the end of the reactor L3, the reactor The other end of L3 is connected to the anode of the rectification bridge arm D, and the cathode of the rectification bridge arm D is connected to the positive output voltage terminal Vo+. The bridge arm connection positive terminal P1 is connected to the anode of the rectification bridge arm D, and the bridge arm connection negative terminal P2 is connected to the ground.

The IGBT series bridge arm Arm: includes at least two or more IGBT tubes used in series, and also includes the positive terminal P2 of the bridge arm and the negative terminal N2 of the bridge arm. The E poles of the IGBT are connected in sequence, the C pole of the top IGBT is connected to the positive terminal P2 of the bridge arm, and the E pole of the bottom IGBT is connected to the negative terminal N2 of the bridge arm. Each IGBT is equipped with automatic voltage limiting circuit, the gate of the IGBT is connected with a drive signal; the IGBT series bridge arm Arm is a detachable component to be tested.

The bridge arm of the Boost circuit platform is connected to the positive terminal P1, and the bridge arm is connected to the negative terminal N1, so that different IGBT series bridge arms can be tested; during detection, the positive terminal P2 of the bridge arm is connected to the positive terminal of the bridge arm. The bridge arm negative terminal N2 is connected to the bridge arm connection negative terminal N1.

The automatic voltage limiting circuit of each IGBT of the bridge arm of the utility model adopts the invention patent of our company. Application number: 201010110043.7.

The rectifier bridge arm D is composed of a high-voltage diode, or a plurality of high-speed diodes connected in series, and the diodes are connected in parallel with a voltage equalizing circuit.

Among them, the input terminal voltage is the city power supply 220V or 380V or the voltage processed by a 1:2 transformer.

Wherein, the test device is provided with a protective door made of transparent tempered glass to protect safety and facilitate observation.

The beneficial effects of the utility model are: 1. The utility model can test the static voltage equalization and dynamic voltage equalization of the IGBT series bridge arms, and can simulate the characteristic that the dynamic voltage equalization of the IGBT series bridge arms in the inverter circuit is determined by the load current. 2. The utility model is close to reality, comprehensive in detection, simple and reliable, and low in cost. 3. According to the Boost circuit principle, the voltage gain is proportional to the duty cycle, up to 8--9 times. Therefore, the withstand voltage on the IGBT bridge arm can reach thousands of V, and it is easy to obtain a high-power power supply, which saves costs. 4. It is easy to test the dynamic characteristics of the IGBT series bridge arms under multiple different voltage differences.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic circuit diagram of the IGBT series bridge arm Arm of the present invention.

detailed description

Please refer to Fig. 1-2, the utility model relates to a performance test device for an IGBT series bridge arm, which includes a Boost circuit and an IGBT series bridge arm Arm.

The Boost circuit platform includes an input terminal voltage Uin, at least one input terminal filter capacitor Cin, a bridge arm connected to a positive terminal P1, a bridge arm connected to a negative terminal N1, reactors L1, L2, L3, DC circuit breakers K1, K2, K3, rectifier bridge arm D, load Load, at least one output filter capacitor Co and a voltage indicator V, the input voltage Uin is connected in parallel with the input filter capacitor Cin, the load Load is connected to the output filter capacitor Co and the voltage indicator V In parallel connection, one end of DC circuit breaker K1 is connected to the positive pole of input voltage Vin, the other end is connected to one end of reactor L1, the other end of reactor L1 is connected to the anode of rectifier bridge arm D, one end of DC circuit breaker K2 is connected to the positive pole of input voltage Vin The other end is connected to one end of the reactor L2, the other end of the reactor L2 is connected to the anode of the rectifier bridge arm D, one end of the DC circuit breaker K3 is connected to the positive pole of the input voltage Vin, and the other end is connected to the end of the reactor L3, the reactor The other end of L3 is connected to the anode of the rectification bridge arm D, and the cathode of the rectification bridge arm D is connected to the positive output voltage terminal Vo+. The bridge arm connection positive terminal P1 is connected to the anode of the rectification bridge arm D, and the bridge arm connection negative terminal P2 is connected to the ground.

The IGBT series bridge arm Arm: includes at least two or more IGBT tubes used in series, and also includes the positive terminal P2 of the bridge arm and the negative terminal N2 of the bridge arm. The E poles of the IGBT are connected in sequence, the C pole of the top IGBT is connected to the positive terminal P2 of the bridge arm, and the E pole of the bottom IGBT is connected to the negative terminal N2 of the bridge arm. Each IGBT is equipped with automatic voltage limiting circuit, the gate of the IGBT module is connected with a drive signal; the IGBT series bridge arm Arm is a detachable component to be tested.

The bridge arm of the Boost circuit platform is connected to the positive terminal P1, and the bridge arm is connected to the negative terminal N1, so that different IGBT series bridge arms can be tested; during detection, the positive terminal P2 of the bridge arm is connected to the positive terminal of the bridge arm. The bridge arm negative terminal N2 is connected to the bridge arm connection negative terminal N1.

The rectifier bridge arm D is composed of multiple high-speed diodes connected in series, and the diodes are connected in parallel with a voltage equalizing circuit.

The filter capacitor Co at the output end of the boost circuit is composed of multiple capacitors connected in series, and each capacitor has a voltage equalizing circuit. By connecting different numbers of capacitors in series, high-voltage alternating current can be filtered.

The output load is a resistive load, which is easy to achieve high power output.

The further technical solution of the utility model is: the gate of each IGBT is connected with a drive signal, and the duty cycle of the drive signal is adjustable from 0-90%. The voltage difference between the input voltage and the output voltage of the Buck circuit can be adjusted. The range is large, the minimum voltage difference is 0V, and the maximum voltage difference is the difference between the output voltage and the input voltage of the Boost circuit. Therefore, it is easy to test the dynamic characteristics of the IGBT series bridge arms under multiple different voltage differences.

A further technical solution of the present invention is: the gate of each IGBT is connected with a driving signal. The driving signal of each IGBT is not the same. The delay between each driving signal is adjustable, the turn-on delay can reach 2uS, and the turn-off delay can also reach 2uS. It ensures that the IGBT series bridge arm can still work normally under the most severe signal. Improve the reliability of the IGBT series bridge arm.

The utility model can test the parameter difference of each IGBT on the IGBT series bridge arm, analyze the safe working ability of the IGBT series bridge arm, compare the parameters of different IGBTs, and analyze the working status of each component of the IGBT series voltage limiting circuit.

The dynamic voltage of each IGBT in the bridge arm is determined by the inductor current. In the Boost continuous working mode, the voltage at the bridge arm connected to the positive terminal P1 is the Boost circuit output voltage Vo plus the rectifier diode module voltage, and the current when it is turned on is The current continuous current of the reactor. Therefore, the dynamic voltage equalization of the IGBT series bridge arm circuit is determined by the load current. It can replace the freewheeling problem of the inverter circuit.

The automatic voltage limiting circuit of each IGBT of the bridge arm of the utility model adopts the invention patent of our company. Application number: 201010110043.7.

The further technical scheme of the utility model is: the test system is provided with a protective door made of transparent toughened glass to protect safety and facilitate observation.

The above embodiment is only a description of the preferred implementation of the utility model, and is not intended to limit the scope of the utility model. On the premise of not departing from the design spirit of the utility model, ordinary engineers and technicians in the field made the technical solution of the utility model Various modifications and improvements should fall within the protection scope determined by the claims of the present utility model.

Claims (5)

1. A kind of IGBT series bridge arm performance testing device, comprise Boost circuit platform and IGBT series bridge arm Arm, it is characterized in that: The Boost circuit platform includes an input terminal voltage Uin, at least one input terminal filter capacitor Cin, a bridge arm connected to a positive terminal P1, a bridge arm connected to a negative terminal N1, reactors L1, L2, L3, DC circuit breakers K1, K2, K3, rectifier bridge arm D, load Load, at least one output filter capacitor Co and a voltage indicator V, the input voltage Uin is connected in parallel with the input filter capacitor Cin, the load Load is connected to the output filter capacitor Co and the voltage indicator V In parallel connection, one end of DC circuit breaker K1 is connected to the positive pole of input voltage Vin, the other end is connected to one end of reactor L1, the other end of reactor L1 is connected to the anode of rectifier bridge arm D, one end of DC circuit breaker K2 is connected to the positive pole of input voltage Vin The other end is connected to one end of the reactor L2, the other end of the reactor L2 is connected to the anode of the rectifier bridge arm D, one end of the DC circuit breaker K3 is connected to the positive pole of the input voltage Vin, and the other end is connected to the end of the reactor L3, the reactor The other end of L3 is connected to the anode of the rectification bridge arm D, the cathode of the rectification bridge arm D is connected to the positive output voltage terminal Vo+, the bridge arm is connected to the positive terminal P1 and the anode of the rectification bridge arm D, and the bridge arm is connected to the negative terminal P2 and the ground connected, The IGBT series bridge arm Arm: includes at least two or more IGBT tubes used in series, and also includes the positive terminal P2 of the bridge arm and the negative terminal N2 of the bridge arm. The E poles of the IGBT are connected in sequence, the C pole of the top IGBT is connected to the positive terminal P2 of the bridge arm, and the E pole of the bottom IGBT is connected to the negative terminal N2 of the bridge arm. Each IGBT is equipped with automatic voltage limiting circuit, the gate of each IGBT is provided with a drive signal; the IGBT series bridge arm Arm is a detachable component to be tested. 2. A kind of IGBT series bridge arm performance test device according to claim 1, is characterized in that: the bridge arm of described Boost circuit platform connects positive terminal P1, bridge arm connects negative terminal N1, can test different IGBT series connection Bridge arm: during testing, connect the positive terminal P2 of the bridge arm to the positive terminal P1 of the bridge arm connection, and connect the negative terminal N2 of the bridge arm to the negative terminal N1 of the bridge arm connection. 3. A performance testing device for IGBT series bridge arms according to claim 1, characterized in that: the input terminal voltage is 220V rectified or 380V rectified by the city power supply, or a DC voltage after step-up and rectification by a 1:2 transformer. 4. A performance test device for IGBT series bridge arms according to claim 1, characterized in that: the rectifier bridge arm D is formed by a high-voltage diode, or a plurality of high-speed diodes connected in series, and the diodes are connected in parallel with a voltage equalizing circuit. 5. The IGBT series bridge arm performance test device according to claim 1, wherein said test device is provided with a protective door made of transparent tempered glass for safety protection and easy observation.