Adjustable frequency-stabilizing voltage-stabilizing variable-frequency variable-voltage power supply

Abstract

The disclosed tunable stable-frequency / voltage frequency / voltage-changing power comprises: a three-phase transformer rectification filter circuit, a reversing-switch signal generation / amplification circuit, an auxiliary power circuit, an independent power circuit, a triode voltage-regulation circuit, a reversing-switch power circuit, a transformer load circuit, a load voltage sampling circuit, a load environmental change voltage sampling circuit, a sample signal amplification / control circuit, and a initiation-control signal generation circuit for power protection. This product has well performance.

Description

technical field [0001] The invention relates to an adjustable power supply, in particular to an adjustable frequency-stabilized voltage-stabilized variable-frequency variable-voltage power supply. Background technique [0002] At present, the single-phase variable frequency power supply usually adopts a bridge circuit, four IGBTs are used as bridge arms, and the bridge itself is a CL series circuit. The method of circuit operation is to use the diagonal bridge arms as a group, switch two groups of IGBTs in reverse phase, and generate alternating current in the bridge CL series circuit, and then transmit the variable frequency power to the load through the transformer with L as the primary coil. The characteristic is that alternating current is generated in a single CL series circuit, the control circuit is more complicated, high voltage is easy to be generated on the IGBT, and the power supply cannot be made very large. [0003] The utility model patent "Portable DC Stabili...

AI Technical Summary

Problems solved by technology

The method of circuit operation is to use the diagonal bridge arms as a group, switch two groups of IGBTs in reverse phase, and generate alternating current in the bridge CL series circuit, and then transmit the variable frequency power to the load through the transformer with L as the primary coil. The characteristic is that alternating current is generated in a single CL series circuit, the control circuit is more complicated, high voltage is easy to be generated on the IGBT, and the power supply cannot be made very large

[0003] The utility model patent "Portable DC Stabilized Voltage Steady Current Variable Voltage Power Supply" (patent number: ZL032640056) disclosed by the applicant discloses a new inverting switching power supply, which uses two IGBTs to switch two coils in inverting phase. Alternating currents are generated in two coils, which can be wound on two ferrite toroidal cores or on one ferrite toroidal core, and the transformer on the core can turn the The frequency conversion energy is sent out. This kind of power supply control circuit is simple, but it is also easy to generate high voltage on the IGBT.

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