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Monitor for inverter bridge commutation - uses signals from current pick=ups in bridge diagonals which are added and trip signal when sum is too large
Monitor for inverter bridge commutation - uses signals from current pick=ups in bridge diagonals which are added and trip signal when sum is too large
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机译:监视逆变器电桥换向-使用相加的电桥对角线上的电流检波信号,以及总和太大时的跳闸信号
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摘要
The investor output is connected to an oscillating circuit. The invertor thyristors in opposite bridge branches are ignited in opposite phases by a control circuit, so that current flows through one diagonal in one half-period, and through the other diagonal in the other half-period. A current pick-up is inserted in each diagonal, whose output signals commutation disturbances to a switching device. The switching device sensitivity abruptly changes from zero to a maximum in synchronism with the invertor frequency. The switching device (20-25) sensitivity is a max. around the commutation instant, and zero during the remaining time. An adder (24) totals commutation signals, and a signal is tripped when the sum exceeds a threshold.
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