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DC fan power supply control module protection method and device

A DC fan and power supply control technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of long short-circuit time, damage to the DC fan power supply control module, etc., to shorten the short-circuit time and protect the damaged effect

Active Publication Date: 2019-04-23
TCL AIR CONDITIONER ZHONGSHAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During this period of fan inertial operation, since the fan speed is not zero, the MCU will also input control signals to the power supply control module according to the fan speed at this time, there is still current flowing inside the power supply control module, and the output phase of the power supply control module If the short circuit occurs for too long, it will cause the DC fan power supply control module itself to be damaged.

Method used

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  • DC fan power supply control module protection method and device
  • DC fan power supply control module protection method and device
  • DC fan power supply control module protection method and device

Examples

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Embodiment 1

[0050] Please refer to figure 1 , in an embodiment of the present invention, the DC fan power supply control module protection method includes the following steps:

[0051] Step S1, according to the first preset frequency f 1 Get the current speed R of the DC fan i ;

[0052]After the fan is powered off, due to inertia and air resistance, the speed changes nonlinearly. In the beginning, the speed drops sharply, and then the area is flat for a while. The scheme of this application follows the preset frequency in the short time before. By obtaining the amplitude of the speed drop, it is judged whether the fan is in the above state of inertial rotation after power failure, here for example f 1 = 100Hz, then sampling 100 times per second, the current speed of the DC fan is R 1 , R 2 , R 3 ...R 100 .

[0053] Step S2, counting the rotational speed R acquired last time within the preset time period i-1 and the current acquired rotational speed R i The difference between is...

Embodiment 2

[0059] refer to figure 2 , as a preferred solution of the first embodiment above, the method further includes:

[0060] Step S6, when the current rotational speed of the DC blower is obtained, adjust the input control signal output to the power supply control module according to the magnitude of the rotational speed, so that the power supply control module can output a corresponding magnitude according to the input control signal The power supply voltage of the DC fan;

[0061] In step S5, the input control signal of closing the power supply control module is specifically: setting the obtained rotational speed of the DC fan to 0.

[0062] For example set value N 1 =100, the above counting result is 100, then the current speed R of the DC fan will be obtained 100 Change it to zero. What needs to be explained here is that the current speed R of the DC fan obtained each time above i are not zero, even when the counting result reaches the set value, it is not zero, for exampl...

Embodiment 3

[0065] Please refer to image 3 , in another embodiment of the present invention, the DC fan power supply control module protection method includes the following steps:

[0066] Step S3, within the initial time period T of the preset time period, when the target speed is equal to the speed R of the DC fan i When the difference is greater than the second preset value, add 1 to the first count value, and reduce the target speed by a third preset value P 3 ;

[0067] In one embodiment of the present application, the initial time period T is 60 seconds, and the current speed R of the DC fan i Acquire according to the preset frequency, assuming that 3 sampling data are acquired per second, the second preset value P 2 Take 200, then in R 1 -R 0 When 0 Decrease the third preset value P 3 , after obtaining R 2 Before, the power supply voltage of the power supply control module has been restored. At this time, the load of the fan is reduced, and the speed of the fan is reduced a...

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Abstract

The present invention discloses a protection method and device for the power supply control module of a direct-current fan. The method includes the following steps that: the rotation speed of the direct-current fan is obtained according to a first preset frequency; the number of the times of the occurring of a condition that the difference value of rotation speed obtained last time and the rotation speed obtained currently is larger than a first preset value in a preset time period is calculated and is set to a first counting value; and when the first counting value is larger than a set value, the input control signals of the power supply control module are cut off, so that no power is supplied inside the power supply control module. With the protection method and device provided by the technical schemes of the invention adopted, phase current outputted by the power supply control module can be short-circuited, and therefore, when over-current occurs on the direct-current fan, and the direct-current fan is powered down, and the control signals of a single-chip microcomputer are cut off automatically before the fan stops rotating, and the power supply control module can be protected.

Description

technical field [0001] The invention relates to overcurrent protection technology, in particular to a protection method and device for a DC blower power supply control module. Background technique [0002] In the existing DC frequency conversion fan technology, the single chip microcomputer outputs control signals to the power supply control module according to the obtained parameters such as the fan speed, indoor temperature, and outdoor temperature, and controls the fan speed by controlling the phase current output by the power supply control module. As long as the fan is rotating, that is, the speed of the fan is not zero, the single-chip microcomputer will output a control signal, and the phase current output by the power supply control module will not be zero. [0003] When a short circuit occurs between the phase currents output by the DC fan power supply control module, the power supply current increases accordingly, and when it reaches the threshold set by the overcu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
CPCH02H7/0811
Inventor 温耿华朱久长
Owner TCL AIR CONDITIONER ZHONGSHAN CO LTD
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