Zero crossing scr firing circuit network专利检索-四极管电子零件及设备专利检索查询-专利查询网

Zero crossing scr firing circuit network

阅读：105发布：2021-12-24

专利汇可以提供Zero crossing scr firing circuit network专利检索，专利查询，专利分析的服务。并且A firing circuit for providing time zero crossing firing of a load-controlling SCR, adapted particularly for firing a loadcontrolling SCR connected in circuit relationship in a single phase of a multi-phase electrical system, including an electrical power supply, a first quad section integrated circuit means connected in circuit relationship with the power supply and including a first flip flop and a second flip flop, a second dual section integrated circuit means connected in circuit relationship with the first integrated circuit means, a photo isolator to accept a logic input from another logic system and including at least one light emitting diode connected in circuit relationship with the aforesaid logic system and a photo transistor coupled to the light emitting diode and connected in circuit relationship with the first and second integrated circuit means, and a load-controlling SCR connected in circuit relationship with the first and second integrated circuit means such that zero crossing firing of the SCR is provided in accordance with a two step process which is initiated when a logic input is fed to the firing circuit through the photo isolator and regardless of when during the cycle the logic input is supplied.，下面是Zero crossing scr firing circuit network专利的具体信息内容。

权利要求

1. A zero crossing firing circuit for a gate controlled semiconductor device having an anode and cathode comprising. a. first and second flip flops, each of said flip flops having first and second inputs and an output, the output of said first flip flop being electrically coupled to said second input of said second flip flop; b. a first gating means having at least a first input and an output, the output of said first gating means being electrically coupled to said first input of said first flip flop; c. a second gating means having at least one input electrically coupled to the output of said second flip flop and an output electrically coupled across the gate to cathode of said device; and d. whereby upon application of a logic signal to at least said second input of said first flip flop and a signal of one polarity from across the anode and cathode of said device to said first inputs of said second flip flop and said first gating means, said circuit is set to await the arrival of the next zero crossing of the anode to cathode signal, and when the anode to cathode signal attains a magnitude of approximately zero potential the output of said second gating means changes potential and causes said device to fire thereby assuring that the firing of said circuit is dependent on the zero crossing of the anode to cathode signal and independent of the time of arrival of the logic signal.

2. A circuit according to claim 1 further comprising amplifying means interposed between the output of said second gating means and the gate of said device.

3. A circuit according to claim 1 wherein said first gating means includes a second input electrically coupled to said second input of said first flip flop.

4. A circuit according to claim 1 wherein said second gating means includes a second input electrically coupled to the output of said first flip flop.

5. A circuit according to claim 1 where each of said first and second flip flops includes means for latching their respective outputs to a fixed signal level when said circuit has been set to await the zero crossing of the anode to cathode signal, and for unlatching their respective outputs upon removal of the applied logic signal from said second input of said first flip flop.

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Zero crossing scr firing circuit network

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