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Dead-band insertion of MCP timer

2014-03-05
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Dead zone insertion of MCP timer: In the bipolar PWM drive system, the power switch devices of the upper and lower bridge arms are turned on alternately (as shown in the half-bridge circuit of Figure 1-1). Figure 1-1 Power switch half-bridge circuit Ideally, the power switch device does not need time to turn on and off. At this time, the drive signals of the upper and lower bridge arms are just opposite; but the actual power switch device needs time to turn on and off, and the off time is longer than the on time. At this time, one bridge arm is not completely turned off, and the other bridge arm is turned on. This will cause the upper and lower bridge arms to be turned on at the same time, causing the power supply to short-circuit, resulting in a large amount of direct current, causing a large amount of heat in the power device, which will not only waste power, but also burn the power switch device. Therefore, in order to avoid the phenomenon of the upper and lower bridge arms being turned on directly, it is necessary to ensure that the other bridge arm is completely turned off before one bridge arm starts. For this purpose, the dead zone protection time is inserted in the PWM drive signal, as shown in the gray bar in Figure 1-2 (this signal is the situation where the power device is turned on at a low level and turned off at a high level).

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