Power supply circuit, power module and variable frequency air conditioner of air conditioner

By connecting the control circuit to the second phase line and the neutral line in the variable frequency air conditioner power supply circuit, the drive circuit is pre-charged through the first phase line and the third phase line, and the problem of phase loss of the phase line and neutral line is solved by using the pre-charge resistor and switch control, thus realizing the safe and reliable operation of the air conditioner and the miniaturization of the power supply circuit.

CN115021543BActive Publication Date: 2026-07-17HEFEI MIDEA HEATING & VENTILATING EQUIP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI MIDEA HEATING & VENTILATING EQUIP
Filing Date
2022-06-10
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

The lack of phase and neutral wires in the existing variable frequency air conditioner power supply circuits leads to unstable operation of the power supply circuit, which can easily damage electronic components. In addition, it requires the use of special function pins of the main control chip, which is not conducive to miniaturization and weight reduction.

Method used

By connecting the control circuit to the second phase line and the neutral line, the drive circuit is pre-charged through the first phase line and the third phase line. Combined with the pre-charge resistor and switch control, protection is achieved in the event of a missing phase line or neutral line, avoiding the need to set up an additional three-phase detection circuit.

Benefits of technology

It enables safe and reliable operation of air conditioners even in the event of a phase loss or neutral wire failure, reduces the footprint and production cost of power supply circuits, and supports the miniaturization and weight reduction of power supply circuits.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN115021543B_ABST
    Figure CN115021543B_ABST
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Abstract

The application provides a power supply circuit of an air conditioner, a power supply module and a variable frequency air conditioner. The power supply circuit comprises three phase lines, namely a first phase line, a second phase line and a third phase line; a zero line; a driving circuit for driving an outdoor unit of the air conditioner, the driving circuit being pre-charged through the first phase line and the third phase line; the driving circuit comprises a first switch arranged on the first phase line; and a control circuit connected with the zero line and the second phase line and used for controlling the opening or closing of the first switch. In the technical scheme, a three-phase detection circuit is not additionally arranged for phase line detection, but the existing power supply circuit of the air conditioner is expanded to realize the phase line and zero line loss protection, so that the power supply circuit of the variable frequency air conditioner is small in size and light in weight, and the production cost of the power supply circuit of the variable frequency air conditioner is reduced.
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