APFC control method of frequency conversion air conditioner under low-frequency model
A frequency conversion air conditioner and control method technology, applied in the direction of output power conversion device, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of increasing the operation time of the controller, many peripheral detection devices, complex control circuits, etc., and achieve fast speed , the algorithm is simple, and the effect of low accuracy requirements
Inactive Publication Date: 2012-11-07
SHANGHAI UNIV +1
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Problems solved by technology
However, the control method based on the multiplier has many peripheral detection devices, the control circuit is complicated and the cost is high, and the sampling results need to be multiplied, which increases the operation time of the controller
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[0019] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Such as figure 1 As shown, the APFC control device of a kind of frequency conversion air conditioner of the present invention under the low frequency model, it comprises: Uncontrollable rectifier bridge 1: used for power supply input, through BOOST type APFC circuit, the power supply is rectified into direct current, raises voltage, controls Harmonics; DC / DC converter 2 connected to uncontrollable rectifier bridge 1: used for energy conversion, by controlling the duty cycle of the DC / DC converter 2 power switch tube T, the above-mentioned rectified voltage is increased to control Compensate the harmonics so that the input current is close to a sine wave; the inverter 3 connected to the DC / DC converter 2: used to invert the DC power boosted by the DC / DC converter 2 above into a three-phase AC power for the air conditioner compressor 4 power suppl...
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The invention discloses an APFC control method of frequency conversion air conditioner under a low-frequency model, comprising the following steps: (1) detecting the zero crossing point of the frequency conversion air conditioner input voltage; (2) carrying out sampling on input voltage Uin through partial pressure sampling resisters R3 and R4, on direct current bus current Io through the currentsampling resistor Rs and on direct current bus voltage Ed through partial sampling resistor R5 and R6; (3) calculating input current Ion according to the detected Uin, Io and Ed; (4) calculating triggering signal duty ratio D, controlling PWM output; (5) utilizing the output of PWM to control the on-off of the power tube T, controlling the harmonic compensation of the frequency conversion air conditioner; and (6) circulating the above steps and finishing power factor correction of the frequency conversion air conditioner. The method does not contain a multiplying unit; only one detection is required in a signal wave period; the speed is high, the algorithm is simple, the number of the required peripheral detecting units is less, the requirement of the precision is not high, the control circuit is simple, thus being capable of effectively lowering cost of frequency conversion air conditioner.
Description
technical field [0001] The invention relates to a power factor correction method of an inverter air conditioner, in particular to an APFC control method of an inverter air conditioner under a low frequency model. Background technique [0002] The existing APFC (Active Power Factor Correction) circuit can not only automatically track and compensate changing harmonics, but also suppress flicker and compensate reactive power. The APFC circuit can improve power quality, reduce power pollution, improve the efficiency of frequency conversion air conditioners, and have significant economic benefits. [0003] The existing active power factor correction (APFC) technology of inverter air conditioner is usually APFC technology based on multiplier. The APFC of the multiplier: use the current control loop and the voltage control loop, in which the current control loop makes the input current closer to the sine wave, and the voltage control loop makes the output voltage more stable; the ...
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IPC IPC(8): H02M1/42H02M1/12
CPCY02B70/126Y02B70/10
Inventor 孙承波朱伦胜荣亦成陈国呈龚波
Owner SHANGHAI UNIV