Air conditioner ptc heater startup control method, medium and air conditioner

A heater and air conditioner technology, applied in heating/cooling equipment, air handling equipment, vehicle parts, etc., can solve the problems of power supply shock, electrical shock of electrical components, shortening the electrical life of electrical components, etc., to improve electrical life and reduce shock current, the effect of reducing the allowable current requirement

Active Publication Date: 2021-10-22
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The high starting current has a great impact on the front-end electrical components, such as fuses, DC contactors, power supplies, etc.
A new energy bus air conditioner is equipped with two PTC heaters on the left and right. If the rated current of each electric heater is 6.67A, then the current of the two electric heaters in stable operation is 13.34A, but the maximum current at startup Up to 33.4A, causing a large electrical shock to the front-end electrical components and shortening the electrical life of the electrical components

Method used

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  • Air conditioner ptc heater startup control method, medium and air conditioner

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: An air conditioner PTC heater startup control method.

[0019] Such as figure 1 As shown, an air conditioner PTC heater startup control method, the specific steps are as follows:

[0020] (1) The main control unit is ready to turn on the auxiliary PTC heater, and first detects the main circuit current I to obtain the main circuit current value I 1 ; I 1 with the set current value I limit1 Compare, if I 1 ≤I limit1 , then turn on the first auxiliary PTC heater 1;

[0021] (2) If I 1 > I limit1 , reduce the frequency of the compressor or stop the compressor (the fan does not stop), thereby reducing the main circuit current I. After the frequency is reduced or the compressor is stopped, the main circuit current I is detected to obtain the main circuit current value I 2 . I 2 with the set current value I limit1 Compare, if I 2 ≤I limit1 , then turn on the first auxiliary PTC heater 1;

[0022] (3) Start timing when PTC1 is turned on, and after t...

Embodiment 2

[0028] Embodiment 2: An air conditioner PTC heater startup control method.

[0029] An air conditioner PTC heater startup control method, the specific steps are as follows:

[0030] The difference from Embodiment 1 is that the current value of the main circuit is not detected, and the auxiliary PTC heater 1 and PTC 2 are respectively turned on at intervals of a certain period of time. Generally, the power-on surge current of the PTC will fall steadily within 30s. As long as the two PTCs are forced to be turned on at intervals of more than 30s, the superposition of the power-on current of the two PTCs can be avoided. That is, other load current 10A + two PTC power-on currents 32A = 42A, the interval is turned on, when the first one is turned on, the current rises to 26A and then falls back to 18A, and then the second PTC is turned on, the current rises to 34A, and then Falling back to 26A can play a role in avoiding large inrush current.

Embodiment 3

[0031] Embodiment 3: a computer-readable storage medium.

[0032] A computer-readable storage medium is used for storing a computer program, and when the computer program is invoked by a processor, the method for controlling the start-up of the air conditioner PTC heater described in Embodiment 1 or Embodiment 2 is realized.

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Abstract

The invention provides a new energy bus air conditioner PTC heater startup control method, computer-readable storage medium and air conditioner. When the heating capacity of the system is insufficient, it is necessary to turn on the auxiliary PTC heater. By detecting the current of the main circuit, when the current of the main circuit is sufficient to turn on the Start the first auxiliary PTC heater after the condition, continue to detect the main circuit current after a period of time, and start the second auxiliary PTC heater when the main circuit current meets the opening conditions. The present invention controls the two PTC heaters to be turned on separately by setting the first buffer time, avoiding the superimposition of the two start-up shocks and large currents, and improving the electrical life of the new energy bus air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner PTC heater startup control method, a computer-readable storage medium and an air conditioner. Background technique [0002] New energy bus air conditioners generally use compressors and PTC heaters for heating. First run the compressor to provide heating capacity, when the heat provided by the compressor is insufficient, turn on the PTC heater for auxiliary heating. [0003] Due to the characteristics of the PTC itself, when the PTC heater is energized and started, the current will have a surge, reach the highest point, then the current will drop, and then gradually stabilize the process. We call the highest point reached by the current overshoot as the maximum starting current. [0004] The maximum starting current will be very large, and some will reach 2.5 times the rated current. For example, a new energy bus air conditioner PTC heater with a ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60H1/00B60H1/22
CPCB60H1/00371B60H1/2218
Inventor 林晖
Owner GREE ELECTRIC APPLIANCES INC
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