KR920022639A - Full-wave drive circuit of sensorless brushless DC motor - Google Patents

Abstract

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Description

Full-wave drive circuit of sensorless brushless DC motor

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3 is a radio wave driving circuit diagram of a sensorless brushless DC motor according to the present invention;

4 is a detailed circuit diagram of the energization angle determiner according to FIG.

5 (a) to (M) are the timing diagrams of the parts according to FIG.

Claims (3)

Comparators (OP11), (OP12), (OP13) for comparing the counter electromotive force (U), (V), (W) of each phase with the common voltage (Vcom), the comparators (OP11), (OP12), (OP13) The comparator OP11 in synchronization with an exclusive oaring section 27 for detecting the edge timings of the outputs U1, V1, and W1 of the control unit and an energization angle control signal according to the output of the exclusive oaring section 27. , Signal delayers 21, 22, and 23 for delaying the outputs U1, V1, and W1 of (OP12), (OP13) by a predetermined timing, respectively, and the signal delayers 21 thereof. And a switching means controlled according to the output of the energization control logic unit 29, which performs an electricity supply control output so that each phase is energized sequentially by performing logic processing on the outputs of (22) and (23). In the propagation drive circuit of the sensorless brushless DC motor composed of each phase driving unit 30 for controlling the energization of each phase through the input, the output signal of the exclusive oaring unit 27 is received and integrated, and the current-angle reference voltage V compared to _θ) According to the edge detection, the conduction angle control clocks CLK1 and CLK2 are generated so that the conduction angle of each phase (U phase, V phase, W phase) becomes 120 ° or more, and the conduction angle control clock CLK1 is generated as the signal. The energization angle determination unit 28 for applying the clock signals of the delayers 21, 22, and 23 and the energization angle control clock CLK2 of the energization angle determination unit 28 are applied as clock signals. Signal delayers 24, 25 for synchronizing the outputs U1, V1, W1 of the comparators OP11, OP12, OP13 to the energization control logic section 29, respectively. ) And (26), the propagation drive circuit of a sensorless brushless DC motor. 2. The energization control logic section 29 according to claim 1, characterized in that the output delays (a1, b1, c1), (a2, b2, c2) of the signal delays (21, 22, 23), (24, 25, 26). Take input A radio wave driving circuit of a sensorless brushed DC motor, characterized in that the logic combination is configured to output each phase (U-phase, V-phase, W-phase) energization control signal. 2. The integrator 28-1 according to claim 1, wherein the energization angle determiner 28 integrates the output of the exclusive oaring portion 27 directly and through the inverter I21 to integrate the up / down linearly to the agitating. Comparator (Op23) and (OP24) for comparing the outputs of the integrators 28-1, 28-2, and the conduction _angle control reference voltage V _θ , respectively, and outputting them as square wave signals. And an edge detector which detects rising and falling edge timings by receiving the outputs of the comparators OP23 and OP24 and generates energizing angle control clocks CLK1 and CLK2 that become rising edges at the edge timings thereof. 28-3) and (28-4), the propagation drive circuit of a sensorless brushless DC motor. ※ Note: The disclosure is based on the initial application.