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
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[0017] The present invention solves its technical problem. The technical solution adopted is to use a single resistor R0 for sampling, such as figure 1 As shown, U+ / U-, V+ / V-, W+ / W- are used to control the on and off of 6 IGBTs. When U+ is high and V- is low, IGBT a is turned on and b is turned off. analogy. MCU adopts triangle wave modulation. Its internal counter TCNT counts from 0 to the maximum count value TC corresponding to the triangle wave carrier frequency. When TCNT = TC, TCNT is cleared to 0, restarts counting from 0, and enters the next calculation control cycle. PWM wave action time T u , T v , T w Register value automatically generates three-phase complementary PWM wave, namely figure 2 In 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 arms of the IGBT such as figure 1 Among them, IGBT a / IGBT d is not through, and the MCU automatically inserts the dead time Td. Td ...
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