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AC-AC frequency conversion air-conditioning control method and controller

A control method and alternating frequency conversion technology, which is applied in the direction of controlling electromechanical brakes, AC motor control, control systems, etc., can solve problems such as low power factor, large capacity of electrolytic capacitors, and large interference, so as to reduce capacitance, improve power factor, The effect of improving conversion efficiency

Active Publication Date: 2015-01-28
HISENSE HOME APPLIANCES GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the electrolytic capacitor used in this type of inverter has a large capacity and high cost. On the other hand, the rectification circuit adopts a three-phase uncontrolled rectification circuit scheme, which has a low power factor and a high proportion of harmonic current above the third order, or Adopting the active power factor correction circuit scheme, although the above problems are solved, the loss is large, the interference is large and the cost is high

Method used

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  • AC-AC frequency conversion air-conditioning control method and controller
  • AC-AC frequency conversion air-conditioning control method and controller
  • AC-AC frequency conversion air-conditioning control method and controller

Examples

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Effect test

Embodiment 1

[0092] Such as figure 1 As shown, it is a structural diagram of the connection mode of AC-AC inverter air conditioner controller and compressor, see figure 1 , an AC-AC frequency conversion air conditioner controller which includes a three-phase rectifier bridge stack 3, a three-phase inverter circuit 4, a main control unit 6, and an LC connected between the three-phase rectifier bridge stack 3 and the three-phase inverter circuit 4 A passive filter circuit, an inverter drive circuit 5 connected between the main control unit 6 and the three-phase inverter circuit 4, the phase current detection signal of the external compressor is input to the main control unit 6, and the main control unit 6 generates six PWM signal outputs To the inverter drive circuit 5, the inverter drive circuit 5 drives the three-phase inverter circuit 4 to work, the FOC field-oriented vector control algorithm is used in the main control unit 6 as the three-phase inverter drive algorithm, and the LC passiv...

Embodiment 2

[0193] On the basis of Embodiment 1, the present invention also provides an AC-AC inverter air conditioner controller, specifically as figure 1 As shown, it includes a three-phase rectifier bridge stack 3, a three-phase inverter circuit 4, a main control unit 6, an LC passive filter circuit connected between the three-phase rectifier bridge stack 3 and the three-phase inverter circuit 4, and a The inverter drive circuit 5 between the main control unit 6 and the three-phase inverter circuit 4, the main control unit 6 is also connected to the compressor phase current detection signal iu / iv, the main control unit 6 generates six PWM signals and drives them through the inverter The circuit 5 drives the three-phase inverter circuit 4 to work. The FOC field-oriented vector control algorithm is used as the three-phase inverter drive algorithm in the three-phase inverter circuit 4. The main control unit 6 is controlled by the control method described in Embodiment 1, so The controller...

Embodiment 3

[0198] Different from Embodiment 2, the three-phase rectifier bridge stack 3 is connected in series in the middle of the LC passive filtering link, placed after the capacitor C1 and the inductor L1, and before the capacitor C2 and the damping resistor R1. According to the working principle of the series circuit, each series unit in the series circuit can exchange the series connection sequence without affecting the overall equivalent circuit function of the series branch. Therefore, the three-phase rectifier bridge stack 2 can be connected in series in the LC passive filter link middle.

[0199] The same or similar reference numerals correspond to the same or similar components;

[0200] The positional relationship described in the drawings is only for illustrative purposes and cannot be construed as a limitation to this patent;

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Abstract

The invention relates to the field of a frequency conversion air conditioner, and more specifically relates to an AC-AC frequency conversion air-conditioning control method and a controller. The method comprises: obtaining a compressor target rotation speed, and detecting the three-phase voltage value of three-phase AC power; according to the three-phase voltage value, extracting the phase and the phase sequence of three-phase voltage; and according to the phase and the phase sequence of the three-phase voltage and the compressor target rotation speed, determining a q-axis current target value, the q-axis current target value participating in an FOC field orientation vector control algorithm, wherein the determined q-axis current target value is associated with a three-phase power source so as to adjust the output power of a compressor driver to enable the output power perform same-phase change with three-phase AC voltage. According to the invention, at the time when a power factor is improved, the capacitivity of an energy storage capacitor can be substantially reduced, an active PFC circuit can be avoided, and the transformation efficiency of the controller is improved.

Description

technical field [0001] The present invention relates to the field of frequency conversion air conditioners, and more specifically, to an AC-AC frequency conversion air conditioner control method and controller. Background technique [0002] The frequency conversion air conditioner is based on the ordinary air conditioner, which uses a special frequency conversion compressor and adds a frequency conversion control system. The main engine of the inverter air conditioner is automatically stepless variable, which can automatically provide the required cooling (heat) according to the indoor conditions; when the indoor temperature reaches the desired value, the air conditioner will run at a constant speed that can accurately maintain this temperature. Realize "non-stop operation" to ensure the stability of the ambient temperature. [0003] In the prior art, the frequency conversion control system is generally called a frequency conversion controller. The inverter is usually an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/08
CPCH02P21/00
Inventor 王斌
Owner HISENSE HOME APPLIANCES GRP CO LTD
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