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A PAM loop control method for frequency conversion air conditioner

A loop control and air conditioner technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of large power consumption, temperature rise, etc., and achieve the effect of reducing loss

Active Publication Date: 2019-07-09
SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large power consumption and temperature rise of parts

Method used

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  • A PAM loop control method for frequency conversion air conditioner
  • A PAM loop control method for frequency conversion air conditioner
  • A PAM loop control method for frequency conversion air conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 2 , 3 , 4, the above step S2 specifically includes:

[0048] S2.1, setting a first switching threshold a;

[0049] S2.1, when I>a, the PAM circuit adopts multiple switching mode to adjust the carrier frequency of the drive signal loaded on the transistor, so that the carrier frequency reaches the first working frequency;

[0050] S2.3, when I≤a, the PAM circuit adopts a double-switch mode to adjust the carrier frequency of the drive signal loaded on the transistor, so that the carrier frequency reaches the second operating frequency.

[0051] PAM loss: P=Psw+Pave, where Psw is proportional to the switching loss and carrier frequency. In this implementation, a is 13A, the first operating frequency is 20kHz, and the second operating frequency is 100Hz, that is, when I>13A, adjust the carrier frequency of the driving signal loaded on the switch so that the carrier frequency reaches 20kHz, and now Psw is 20w-40w; when I≤13A, adjust the carrier frequency ...

Embodiment 2

[0053] Such as Figure 5 As shown, in the above-mentioned step S2, the PAM loop uses a complex number of switches, and adopts different carrier frequencies according to the difference of I, specifically including:

[0054] S2.1, respectively setting the second switching threshold b and the third switching threshold c of the main circuit current, where b

[0055] S2.2, when I>c, adjust the carrier frequency of the driving signal loaded on the transistor, so that the carrier frequency reaches the third operating frequency;

[0056] S2.3, when b

[0057] S2.4, when I≦b, adjust the carrier frequency of the drive signal loaded on the transistor, so that the carrier frequency reaches the fifth operating frequency.

[0058] In this embodiment, c is 13A, the third operating frequency is 20kHz; b is 10A, the fourth operating frequency...

Embodiment 3

[0063] Such as figure 2 , 3 , 6, the above step S2 specifically includes:

[0064] S2.1, respectively setting the fourth switching threshold d and the fifth switching threshold e of the main circuit current, where d

[0065] S2.2. When I>d, the PAM loop adopts multiple switches, and adopts different carrier frequencies according to I. When I≤d, the PAM loop adopts two switches.

[0066] Step S2.2 includes:

[0067] S2.2.1, when I>e, adjust the carrier frequency of the driving signal loaded on the transistor, so that the carrier frequency reaches the sixth operating frequency, and at this time, the PAM circuit adopts the mode of multiple switching;

[0068] S2.2.2, when d

[0069] S2.2.3, when I≤d, adjust the ...

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PUM

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Abstract

The invention discloses a PAM (Pulse Amplitude Modulation) circuit control method for a variable frequency air conditioner. The method is implemented through drive signal control. The method includes S1, setting a numerical value of a main circuit current I of the air conditioner as a switching threshold value; S2, when I is greater than the switching threshold value, the PAM circuit adopts a mode of multiple-time switching, and when I is smaller than or equal to the threshold value, the PAM circuit adopts a mode of 2-time switching, so that output of the PAM circuit meets requirements for standard harmonic current. According to the invention, a segmented control mode is adopted according to current change of the main circuit, so that an effect of reducing loss effectively is achieved.

Description

technical field [0001] The invention relates to the frequency conversion technology of an air conditioner, in particular to a PAM loop control method of a frequency conversion air conditioner. Background technique [0002] In the traditional frequency conversion circuit, the diode module rectifies the AC voltage into a DC voltage, the smoothing capacitor smoothes the DC waveform, and the IPM converts the DC voltage into an analog AC voltage to drive the compressor motor. [0003] However, it is difficult to meet the "IEC Harmonic Current Standard" through the above loop, because harmonics will be generated in the input current waveform, and the power factor will also be reduced. In order to meet the harmonic current standards of IEC and GB, a PAM circuit is used in the frequency conversion circuit of the frequency conversion air conditioner. We use a simple local conversion method realized by PAM. Before the AC voltage is rectified in the passively controlled frequency conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06
CPCH02P27/06
Inventor 张旻陈子路谷藤仁
Owner SHANGHAI MITSUBISHI ELECTRIC&SHANGLING AIR CONDITIONER & ELECTRIC APPLIANCE CO LTD