High frequency three-phase four-wire digit power supply

Abstract

The invention discloses a high frequency three-phase four-wire digit power supply comprising a power generator, a three-phase bridge rectifier circuit, an OCL-BTL combined output circuit, a voltage feedback detection circuit, a gain adjusting circuit, a local oscillator signal-generator, a three phase SPWM modulation circuit, a three-phase SPWM output circuit, a three-phase SPWM isolation drive circuit, and a LC filter circuit; the three-phase bridge rectifier circuit and the OCL-BTL combined output circuit can respectively rectify and regulate voltage of the AC current outputted by the power generator, and three-phase wires (V, U and W) and a neutral wire N can be led out so as to form the three-phase four-wire digit power supply, thus respectively obtaining single-phase and three-phase; one digit power supply can provide two power supply modes, thus greatly developing the application scope; the high frequency three-phase four-wire digit power supply is simple in structure and low in cost; when compared with a numerical control frequency conversion structure of a conventional digital frequency conversion generator single-chip microcomputer control module, the three-phase four-wire digit power supply can effectively solve the problems that the single-chip microcomputer control module will collapse under limit states, thus causing power supply failure.

Description

technical field [0001] The invention relates to a power supply, in particular to a high-frequency three-phase four-wire digital power supply. Background technique [0002] As a power supply, digital variable frequency generators are widely used in various household appliances and mechanical equipment because of their small size, light weight, high efficiency, energy saving, quietness, and stable voltage. The digital variable frequency generator includes a generator and a variable frequency power control system. The variable frequency power control system converts the unstable AC power output by the generator into a stable AC power output for the load. However, it usually only has a single-phase output and the power is small. , it cannot be used for loads that require multi-phase power supply mode. Moreover, the frequency conversion power supply control system of the existing digital frequency conversion generator generally includes a single-chip microcomputer control module...

AI Technical Summary

Problems solved by technology

The digital variable frequency generator includes a generator and a variable frequency power control system. The variable frequency power control system converts the unstable AC power output by the generator into a stable AC power output for the load. However, it usually only has a single-phase output and the power is small. , for loads that require multi-phase power supply mode, it cannot be used

Moreover, the frequency conversion power supply control system of the existing digital frequency conversion generator generally includes a single-chip microcomputer control module, a rectification module and an inverter module. The module is inverted into a stable and suitable AC power for the load. Because the calculation of the single-chip control module is cumbersome, it is easy to collapse in the limit state, which makes the digital frequency conversion generator unable to work and causes power paralysis. The numerical control frequency conversion structure of the single-chip control module is adopted. , complex structure and high cost

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