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Variable-frequency air conditioner PFC control method based on IGBT ringing time

A technology of ringing time and control method, applied in the output power conversion device, the conversion of AC power input to DC power output, high-efficiency power electronic conversion, etc. Controlling errors and accurate current sampling

Active Publication Date: 2016-08-31
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a PFC control method for inverter air conditioners based on IGBT ringing time to solve the problem of control errors caused by inaccurate current sampling methods in the prior art

Method used

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  • Variable-frequency air conditioner PFC control method based on IGBT ringing time
  • Variable-frequency air conditioner PFC control method based on IGBT ringing time
  • Variable-frequency air conditioner PFC control method based on IGBT ringing time

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Embodiment

[0031] figure 2 The circuit diagram of the PFC control circuit provided by the embodiment of the present invention, the first embodiment is based on the PFC control circuit to implement a PFC control method for an inverter air conditioner based on IGBT ringing time. Such as figure 2 As shown, the PFC control circuit includes a rectifier bridge A, a first capacitor C1, a first inductor L1, a first transistor T1, a first resistor R1, a second capacitor C2, a second transistor T2 and a third capacitor C3.

[0032] The rectifier bridge A may include a third transistor T3, a fourth transistor T4, a fifth transistor T5 and a sixth transistor T6. Preferably, the third transistor T3, the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 may all be diodes.

[0033] The positive pole of the third transistor T3 is connected to the negative pole of the sixth transistor T6, and is connected to the first input terminal of the PFC control circuit, and the PFC cont...

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Abstract

The invention relates to the technical field of air conditioner control, and provides a variable-frequency air-conditioner PFC control method based on IGBT ringing time. The method comprises the following steps: arranging a PFC DC bus current AD sampling trigger position in IGBT turn-off time; in each PFC carrier wave period, according to a PFC DC bus current sampling point position, arranging a corresponding AD sampling control register, in each PFC carrier wave period, according to the PFC DC bus current sampling point position, arranging a corresponding AD sampling control register, when a PFC counter value is equal to an AD sampling control register value, triggering PFC current AD sampling, after the PFC current AD sampling is finished, triggering corresponding PFC AD to be turned off, and in a PFC AD interruption service program, reading a bus current AD sampling value; and according to the bus current AD sampling value obtained after sampling processing, adjusting PWM signals controlling conduction time and turn-off time of an IGBT. According to the technical scheme brought forward by the invention, the problem of control errors caused by inaccurate current sampling is avoided.

Description

technical field [0001] The invention belongs to the technical field of air conditioner control, in particular to a PFC control method for an inverter air conditioner based on IGBT ringing time. Background technique [0002] At present, as the frequency increases, the DC bus voltage of the inverter air conditioner will drop. At the same time, the bus voltage will fluctuate with the change of the motor load, and the current waveform will be greatly distorted. In order to stabilize the DC bus voltage and improve the power factor, PFC control technology is often used . [0003] The full name of PFC in English is "Power Factor Correction", which means "power factor correction". [0004] The traditional PFC control method is implemented either through hardware circuits or complex algorithms. The DC bus voltage cannot be very stable, and the power factor is not ideal. Some control models need to detect the zero-crossing point of the input voltage. Near the zero-crossing point Wit...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M7/217
CPCH02M1/42H02M7/217Y02B70/10
Inventor 陈跃刘启武朱绯
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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