1 Introduction
The rapid development of power electronics technology has made the application of power electronic devices more and more extensive. At present, in the power electronic device, in the place where the isolated power source is required, an independent working power source including the original and secondary circuits is provided, the circuit is complicated, the efficiency is low, the volume is large, the cost is high, and the reliability is low; some power electronic devices The use of a dedicated single-supply drive circuit with a voltage pump eliminates the need for complex multi-channel isolation auxiliary power supplies, but due to the limitations of this dedicated circuit, it is not suitable for high voltage, high power and other special needs. A multi-output isolated power supply driving circuit for a power electronic device adopts a distributed power supply mode, and a set of main circuits can be used to generate multiple sets of secondary side voltages that are isolated from each other, compared with other forms of power supplies, in output power and When the number of output channels is equal, there are significant advantages such as small size, light weight, high efficiency, and high reliability. Moreover, since the transformer with the secondary winding of the independent magnetic circuit is adopted, the number of the secondary windings is also convenient to increase or decrease the number of the output isolated power supply, especially when the number of the isolated power supply is large, the advantage of the power supply is More obvious.
Figure 1 Three-phase bridge solid state short circuit fault current limiter
2 system structure
The multi-output isolated power supply driving circuit is shown in Figure 2. It uses a common set of AC busbars to perform high-frequency transformer isolation conversion in the place where the main circuit needs auxiliary power supply, and is rectified, filtered, and stabilized. DC voltage. The distributed power supply method solves the difficulty of multiple isolated outputs, and it can be close to the power supply object in the actual circuit, reducing the chance of being disturbed. The insulation voltage of the isolation transformer can also be made relatively high, and the distributed capacitance of the primary and secondary sides is relatively small.
Figure 2 multi-output drive circuit power supply mode
3 working principle
The structural block diagram of the drive circuit is shown in Figure 3. The dotted line frame 1 is a rectifying and linear voltage stabilizing circuit, and the dotted line frame 2 is a driving circuit with strong triggering.
Figure 3 is a block diagram of the drive circuit
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