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Control circuit and control method of PWM blower fan used for refrigerator

A control method and control circuit technology, applied in pump control, mechanical equipment, machine/engine, etc., can solve the problems of low start-up efficiency and long time for PWM fan speed to stabilize, achieve soft start and stop, and avoid standby function consumption effect

Inactive Publication Date: 2015-09-23
HAIER SMART HOME CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this time, the PWM fan still has standby power consumption
On the other hand, when the above-mentioned PWM fan is started, the PWM square wave working signal is directly input, the starting efficiency is low, and the time for the PWM fan speed to stabilize is too long.

Method used

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  • Control circuit and control method of PWM blower fan used for refrigerator
  • Control circuit and control method of PWM blower fan used for refrigerator
  • Control circuit and control method of PWM blower fan used for refrigerator

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. However, this embodiment does not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to this embodiment are included in the protection scope of the present invention.

[0039] Such as figure 1 Shown is a schematic diagram of the PWM fan control circuit used in the refrigerator according to the present invention. The PWM fan has a power port 1 , a PWM signal port 2 , a feedback port 3 and a ground port 4 . The PWM fan control circuit includes a power supply circuit connected to the power port 1 and the PWM fan working power supply VCC and a main control circuit. The power supply circuit includes a power control switch for controlling the on-off of the power supply circuit; the main control circuit includes a PWM signal circuit connected to the PWM signal port 2, a feedback ...

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PUM

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Abstract

The present invention provides a control circuit and control method of a PWM blower fan used for a refrigerator. The PWM blower fan is provided with a power supply port, a PWM signal port, a feedback port and a grounding port. The control circuit of the PWM blower fan comprises a power supply circuit and a master control circuit; the power supply circuit comprises a power control switch used for controlling on and off of the power supply circuit; and the master control circuit comprises a PWM signal circuit connected to the PWM signal port, a feedback circuit connected to the feedback port, and a power signal line connected to the power control switch. The master control circuit receives a PWM blower fan shutdown instruction and controls the power supply circuit to stop supplying the PWM blower fan with power via the power control switch. By adoption of the control circuit and control method of the PWM blower fan used for the refrigerator, when the PWM blower fan is shutdown, standby power consumption of the PWM blower fan is effectively prevented, start and stop of the PWM blower fan can be more flexible, and the PWM blower fan can reach a target rotating speed quickly when starting.

Description

technical field [0001] The invention relates to the field of refrigerator control, in particular to a PWM fan control circuit and control method for refrigerators. Background technique [0002] In response to the higher demands of the market and users, and in order to reduce the energy consumption of refrigerators, more and more refrigerators have introduced adjustable-speed fans. When the existing PWM fans are used in refrigerators, they are generally provided with a VCC power line, a PWM signal line, a feedback signal line and a GND grounding line. Among them, the PWM duty cycle input by the PWM signal line controls the speed of the PWM fan, and the corresponding relationship is that the duty cycle 0~100% corresponds to the stop of the PWM fan~the full speed of the fan. [0003] When the above PWM fan is used (attached figure 2 As shown), the speed adjustment is realized through different duty ratios sent by the PWM signal line, and when the PWM fan is not required to wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
Inventor 赵国良唐松志李京昌吴敏邹磊
Owner HAIER SMART HOME CO LTD
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