Fixed-frequency air conditioner low-voltage operation control method and boost circuit

A low-voltage operation and control method technology, applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc., can solve problems such as falling, fixed-frequency air conditioners cannot be started, and motor efficiency of shutdown, and increase the cost of air conditioning. Effect

Active Publication Date: 2019-05-31
QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems that the existing fixed-frequency air conditioner is prone to failure to start and stop at low voltage and the motor efficiency is obviously reduced, the present invention proposes a low-voltage operation control method and a booster circuit for a fixed-frequency air conditioner, which can solve the above problems

Method used

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  • Fixed-frequency air conditioner low-voltage operation control method and boost circuit
  • Fixed-frequency air conditioner low-voltage operation control method and boost circuit

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1. This embodiment proposes a low-voltage operation control method for a fixed-frequency air conditioner, such as figure 1 As shown, such as including the following steps:

[0034] S1. Set the duty cycle upper limit value for the speed gear of the indoor fan respectively, and save it;

[0035] At present, the indoor circuit board can easily realize the detection of the duty cycle by optimizing the hardware and program, and writing the set critical value into the program, and controlling the relay switch to switch the gear of the booster.

[0036] S2. Detect the current speed gear of the indoor fan;

[0037] The gear position of the indoor fan is set by the user, and the parameter can be obtained when the air conditioner is turned on and running.

[0038] S3. Detecting the current duty cycle of the indoor fan;

[0039] S4. According to the current speed gear of the indoor fan, find the upper limit value of the duty cycle corresponding to the speed gear, and...

Embodiment 2

[0053] Embodiment 2. Based on the low-voltage operation control method of the fixed-frequency air conditioner in Embodiment 1, this embodiment proposes a boost circuit for a fixed-frequency air conditioner. The boost circuit is controlled by a single-chip microcomputer. When the AC input to the compressor When the voltage is low, it is used to boost the input AC voltage and output it to the compressor to ensure the normal start and operation of the compressor, such as figure 2 As shown, the boost circuit includes a single-pole double-throw relay K, a transformer T, and a single-chip microcomputer, and the single-chip microcomputer is used to: detect the current speed gear of the indoor fan;

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Abstract

The invention discloses a low-voltage operation control method of a fixed-frequency air conditioner. The control method comprises the following steps that (1) the upper limit values of the duty ratios are set for rotation speed gears of an indoor fan correspondingly and stored; (2) the current rotation speed gear of the indoor fan is detected; (3) the current duty ratio of the indoor fan is detected; (4) according to the current rotation speed gear of the indoor fan, the upper limit value of the duty ratio corresponding to the current rotation speed gear is searched for, and the current duty ratio of the indoor fan is compared with the found upper limit value of the duty ratio; (5) if the current duty ratio of the indoor fan is smaller than the found upper limit value of the duty ratio, the current operation state is maintained, otherwise, boost control is carried out; and (6) the input alternating voltage is boosted. According to the control method, through the relation between the duty ratio value of the indoor fan and the power supply voltage, boost control is conducted on the power supply voltage based on the duty ratio of the indoor fan, accordingly, the effect that the air conditioner can operate stably and normally is guaranteed, and the situation that the air conditioner is shut down or cannot be started is avoided.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a low-voltage operation control method and a booster circuit of a fixed-frequency air conditioner. Background technique [0002] The operating temperature range of existing household fixed-frequency air conditioners is generally between -7°C and 43°C outdoor temperature, and the operating voltage range is generally between 198V and 242V. When the temperature is too high or the voltage is too low, the air conditioner often shuts down or fails. Normal start. [0003] At present, there are mainly the following methods to solve the low-voltage start-up of fixed-frequency air conditioners: 1. The method of switching the pressure load. The disadvantage is that although the operating voltage of the air conditioner can be reduced to a certain extent, the impact on the core component compressor is not enough. obvious. This method is more effective only in the voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/88F24F110/30
Inventor 王法军李洪超
Owner QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD
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