Current converter test circuit

Abstract

This invention discloses a converter test circuit. The test converter work in the inverter of 'DC - single-phase AC or three-phase AC'. That is to transform DC into single-phase or three-phase AC, the testes converter DC-DC is connected to power supply, and there is a the DC power supply is a energy storage capacitor between the negative and positive, the AC end is connected to high inductive load. In test, described high inductive load through the pulse width modulation control of the converter, achieve the energy cycle between energy storage capacitor through reactive power. Adopt the test circuit, as long as the appropriate control of the converter can achieve converter work with the actual work in the same current and power conditions to get equal effective test data of existing technology, but the actual energy loss was very small.

Description

technical field [0001] The invention relates to the converter technology, in particular to a test circuit of the converter. Background technique [0002] In various motor drive occasions, high-power converters are widely used. These converters are used to provide drive power to the motor. During the conversion process, the power supply voltage provided by the power supply network is converted into a power supply voltage of appropriate voltage and frequency, which is provided to the motor. [0003] For high-power converters in the above-mentioned applications, it is necessary to test the working conditions of the converter through test methods. In the prior art, a test circuit as shown in Fig. 1a-1c or Fig. 2a-2c is adopted. [0004] The three test circuits shown in Fig. 1a-1c respectively adopt the same test method for different types of converters. Their common feature is that an asynchronous motor is connected to the output end of the converter as a load. After the async...

AI Technical Summary

Problems solved by technology

Among them, the method shown in Figure 1 needs to set up several groups of motors, so that it has problems such as complex system, large floor space, and high cost of test equipment; at the same time, the transmission equipment is easy to wear, and the maintenance cost is high; Continuous rotation, loud mechanical noise

In the method shown in Figure 2, because all the test power is consumed through the resistance, the electric energy cannot be recovered, and the energy loss is huge; because this method needs to configure high-power heat dissipation equipment for the load, the cost increases. When using heat dissipation equipment such as fans, it will also generate noise

Images