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Motor power supply circuit and household appliance having same

A power supply circuit and circuit technology, which is applied to electrical components, output power conversion devices, and AC power input to AC power output. The effect of withstand voltage

Active Publication Date: 2020-10-30
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The specific function of the braking resistor is not clear;
[0005] 2) When controlling the brake resistor, there are risks such as slow response speed, untimely suppression of bus voltage, and possible failure

Method used

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  • Motor power supply circuit and household appliance having same
  • Motor power supply circuit and household appliance having same
  • Motor power supply circuit and household appliance having same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 It is a structural block diagram of the motor power supply circuit of the embodiment of the present invention.

[0030] Such as figure 1 As shown, the motor power supply circuit 100 includes: a rectifier circuit 110 , a bus capacitor C0 , a surge absorbing circuit 120 , an inverter circuit 130 , a voltage detection circuit 140 and a brake control circuit 150 .

[0031] Wherein, the input end of the rectification circuit 110 is connected to the AC power supply AC, the rectification circuit 110 has a first output end and a second output end, and the rectification circuit 110 is used to receive the alternating current output from the alternating current power supply AC, and rectify the alternating current to output direct current . The bus capacitor C0 is connected between the first output terminal and the second output terminal of the rectification circuit 110 . The surge absorbing circuit 120 is connected in parallel with the bus capacitor C0, and the surge a...

Embodiment 2

[0078] Figure 13 It is a structural schematic diagram of a household appliance according to an embodiment of the present invention.

[0079] Such as Figure 13 As shown, the household appliance 1000 includes the motor power supply circuit 100 of the above-mentioned embodiment.

[0080] Alternatively, the home appliance 1000 may be an air conditioner.

[0081] The household appliance of the embodiment of the present invention adopts the motor power supply circuit of the above embodiment, and through the combination of software and hardware, when the continuous software brake signal cannot suppress the DC bus voltage from continuing to rise, by inserting a duty cycle greater than the software brake The hardware braking signal of the signal can quickly and effectively pull down the DC bus voltage.

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PUM

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Abstract

The invention discloses a motor power supply circuit and household appliance having the same. The motor power supply circuit is characterized in comprising the following parts of a rectifier circuit having a first output end and a second output end and used for rectifying the alternating current power; a bus capacitor connected between the first and second output ends of the rectifier circuit; a surge absorbing circuit connected in parallel with the bus capacitor and comprising an absorbing resistor and a controllable switch connected in series; an inverter circuit respectively connected to the first and second output ends of the rectifier circuit and used for controlling the motor; a voltage detection circuit used for detecting the voltage of the bus capacitor; and a brake control circuitused for generating a brake signal according to the voltage of the bus capacitor, and controlling the controllable switch to be continuously turned on or pulsed on according to the brake signal, so that the voltage of the bus capacitor fluctuates within a preset range to avoid exceeding the withstand voltage value of the power device in the inverter circuit.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a motor power supply circuit and a household appliance with the motor power supply circuit. Background technique [0002] With the advancement of technology, the capacitance of the smoothing filter capacitor in the motor power supply circuit is gradually reduced. However, as the capacitance value decreases, the voltage fluctuation on the smoothing filter capacitor becomes larger, especially for motor loads that are prone to out-of-step risks, and the voltage on the smoothing filter capacitor will suddenly rise to a relatively high level, exceeding the endurance of the power device. pressure value. [0003] For this reason, it is proposed in the related art to absorb the abnormal fluctuating voltage on the DC bus through the braking resistor, but this technology has at least the following technical problems: [0004] 1) The specific function of the braking resistor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M1/32
Inventor 杨永欢付兆强黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD