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A frequency conversion circuit and a frequency conversion air conditioner

A circuit and branch technology, applied in the field of variable frequency circuits and variable frequency air conditioners, can solve problems such as affecting normal use and insufficient cooling or heating capacity of air conditioners

Active Publication Date: 2020-01-17
SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It will directly cause insufficient cooling or heating capacity of the air conditioner, affecting normal use

Method used

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  • A frequency conversion circuit and a frequency conversion air conditioner
  • A frequency conversion circuit and a frequency conversion air conditioner
  • A frequency conversion circuit and a frequency conversion air conditioner

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Embodiment Construction

[0026] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the present invention provides a frequency conversion circuit and an outdoor unit of a frequency conversion air conditioner using the frequency conversion circuit.

[0028] The frequency conversion circuit includes: a diode bridge stack DB for rectification, a PAM circuit (PAM: Pulse Amplitude Modulation), and an intelligent power module IPM for inverter. The interior of the intelligent power module IPM is a three-phase bridge inverter circuit composed of multiple sets of switching tubes and freewheeling diodes, to which the CPU control signal is input, as well as the DC voltage rectified by the diode bridge stack DB and pulse amplitude modulated by the PAM circuit. , to obtain a variable frequency and variable voltage power supply, which is used to drive the compressor motor M...

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Abstract

The invention discloses a variable frequency circuit and a variable frequency air conditioner. By setting a bus voltage upper limit value, when a conversion circuit detects that the bus voltage reaches the bus voltage upper limit value, an MICOM (Microcomputer) sends operation drive stopping signals to gate poles of different transistors and stops the operation of a PAM (Pulse Amplitude Modulation) circuit. According to the invention, when the operation of the PAM circuit is stopped, an inversion circuit continues working and controls a compressor motor to continue operation, so that operation continuation of the air conditioner is ensured.

Description

technical field [0001] The invention relates to the technical field of frequency conversion air conditioners, in particular to a frequency conversion circuit and a frequency conversion air conditioner. Background technique [0002] The monitoring of the bus voltage is divided into two parts: software monitoring (S / W monitoring) and hardware monitoring (H / W monitoring). figure 2 ), such as when the four-way valve is switched after defrosting, and when the compressor is stopped for 3 minutes and then restarted. With the sharp change of compressor load, the bus voltage will also rise sharply. When the bus voltage rises to the S / W overvoltage interruption value or the H / W overvoltage interruption value, the protection function of the air conditioner starts, and the pulse amplitude modulation circuit and the inverter circuit stop working at the same time. The compressor stops running, whether it is S / W over-voltage interruption or H / W over-voltage interruption, although the air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458
CPCH02M5/458
Inventor 张旻秦杰甲斐昭裕
Owner SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD