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Phase-current single-resistance sampling control method for variable-frequency air conditioner

A single-resistance sampling and control method technology, which is applied in the direction of using digital measurement technology for measurement, can solve problems such as the inability to realize single-resistance sampling, and achieve the effect of control

Active Publication Date: 2015-07-22
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

[0003] The invention provides a single-resistance sampling control method for the phase current of an inverter air conditioner, which reduces product design costs and solves the technical problem that single-resistance sampling cannot be realized in the prior art

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  • Phase-current single-resistance sampling control method for variable-frequency air conditioner

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Embodiment

[0017] The present invention solves its technical problem, and adopts the technical scheme that adopts single resistance R0 sampling, such as figure 1 As shown, use U+ / U-, V+ / V-, W+ / W- to control the on-off of 6 IGBTs. When U+ is high and V- is low, IGBT a is turned on and b is turned off. analogy. The MCU adopts triangular wave modulation, and its internal counter TCNT counts from 0 to the maximum count value TC corresponding to the triangular wave carrier frequency. PWM wave action time T u , T v , T w The register value automatically generates a three-phase complementary PWM wave, namely figure 2 The PWM wave U+ / U-, V+ / V-, W+ / W-, T u , T v , T w The minimum is 0 and the maximum is TC. In order to control the upper and lower bridge arms of the IGBT such as figure 1 The IGBT a / IGBT d is not straight-through, and the MCU automatically inserts the dead time Td. Td can be changed artificially according to the requirements of the IGBT or IPM (6 IGBTs are integrated insi...

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Abstract

The invention relates to a phase-current single-resistance sampling control method for a variable-frequency air conditioner. The specific method is: MCU obtains the maximum value, the intermediate value and the minimum value through the sequencing of the Tu, Tv and Tw value after obtaining the control three-phase PWM wave action time and the Tu, Tv and Tw register values; the MCU set the current sampling registers of a first sampling point and a second sampling point; the MCU sets a corresponding trigger mode according to the registers of the first sampling point and the second sampling point, automatically triggers the AD switching of the first sampling point and the second sampling point according to the registers of the first sampling point and the second sampling point, reads the AD value corresponds to the first sampling point in the interrupt service routine of the PWM wave crest, assigns the opposite number to the phase current corresponds to the minimum value, reads the AD value corresponds to the second sampling point, assigns the AD value to the phase current corresponds to the maximum value, obtains the phase current corresponds to the intermediate value according to the fact that the sum of the three-phase currents is 0, completes the sampling of the three-phase currents of a motor and realizes the sampling of the single resistance. The phase-current single-resistance sampling control method is applicable to the variable-frequency air conditioner.

Description

technical field [0001] The invention relates to an air conditioner control technology, in particular to a frequency conversion air conditioner phase current single resistance sampling control technology. Background technique [0002] The permanent magnet synchronous DC brushless motor needs to sample the U / V / W three-phase coil phase current of the motor to realize the closed-loop control of the motor. The traditional three-phase current sampling method of the motor often uses three resistors or two resistors to sample the motor current. When the two-resistor sampling method is used, the third phase current value is obtained by using the method that the sum of the three-phase current of the motor is 0. Compared with the single In the resistance sampling method, the control circuit is complex and the cost is relatively high. The current technology is still unable to realize the sampling of the phase current by a single resistor. Contents of the invention [0003] The inven...

Claims

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Application Information

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IPC IPC(8): G01R19/25
Inventor 陈跃涂小平刘启武王声纲朱绯
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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