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Control method and control circuit for frequency converter, dielectric and variable frequency air conditioner

A control method and control circuit technology, applied in the field of frequency conversion control, can solve the problems of high cost and occupation of PCB board area, etc.

Active Publication Date: 2018-12-21
广东希塔变频技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a control method, a control circuit, a medium and an inverter air conditioner for a frequency converter, aiming to solve the problem that the cost of the AC voltage sampling circuit of the existing frequency conversion controller is relatively high and the area of ​​the PCB board is occupied

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  • Control method and control circuit for frequency converter, dielectric and variable frequency air conditioner
  • Control method and control circuit for frequency converter, dielectric and variable frequency air conditioner
  • Control method and control circuit for frequency converter, dielectric and variable frequency air conditioner

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no. 1 example

[0061] Further, based on the above-mentioned first embodiment of the control method of the present invention, in the second embodiment of the control method of the present invention, determining the AC voltage input to the frequency converter according to the output power and the second current further includes:

[0062] Obtain the conversion efficiency of the PFC module;

[0063] The AC voltage input to the frequency converter is determined according to the output power, the second current and the conversion efficiency.

[0064] Since the PFC module 30 has a loss during operation, that is, there is a conversion efficiency, after the output power Pout of the inverter 50 is calculated in the above step S220, the output power Pout is the output power of the PFC module 30, and the input power of the calculator is That is, during the input power Pin of the alternating current, the conversion efficiency η of the PFC module 30 can be further considered, and this conversion efficienc...

no. 2 example

[0067] Further, based on the above-mentioned second embodiment of the control method of the present invention, in the third embodiment of the control method of the present invention, obtaining the conversion efficiency of the PFC module includes:

[0068] Obtain the duty cycle of the PWM signal driving the switching tube of the PFC module;

[0069] Determine the conversion efficiency of the current PFC module according to the duty cycle and the current output power.

[0070] When the PFC module 30 is working, its conversion efficiency η is also different when the switching duty cycle of the switch tube Q2 is different. Taking the PFC switching tube Q2 as an example in continuous conduction mode (CCM), the operating frequency of the switching tube Q2 is constant, and its duty cycle varies with the amplitude of the chopped voltage. Specific as image 3 As shown, in the half-wave cycle of an AC voltage, the working current waveform of the switching tube Q2 is shown in each inte...

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Abstract

The invention provides a control method for a frequency converter, a control circuit, a dielectric and a variable frequency air conditioner, The output power of the inverter is determined by acquiring a first current of the inverter driving load and a DC voltage input to the inverter, and then the second current of the PFC module is acquired, the AC voltage input to the inverter is determined according to the output power and the second current, and finally the operating frequency of the load is adjusted according to the AC voltage. Therefore, no separate alternating current circuit is required, the cost of the whole frequency converter is reduced, and the area of the PCB board of the frequency converter circuit is reduced.

Description

technical field [0001] The invention relates to the field of frequency conversion control, in particular to a control method, a control circuit, a medium and a frequency conversion air conditioner for a frequency converter. Background technique [0002] The current frequency conversion controller is generally composed of PFC circuit and inverter circuit. In order to make the controller operate reliably, it is necessary to increase the AC voltage frequency limiting function to prevent the inverter from being protected by the input AC voltage being too high or too low. , when sampling the AC voltage, the sampling circuit cannot use a simple resistor divider circuit because of the reference ground problem, and generally needs to use a dedicated voltage sampling transformer or operational amplifier, which makes the cost of the AC voltage sampling circuit relatively high. High, and occupy the circuit PCB board area where the controller is located. [0003] The above content is o...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02P27/06
CPCH02M5/458H02P27/06H02M1/0009
Inventor 王甫敬
Owner 广东希塔变频技术有限公司