Electronic switching or gating, i.e. not by contact-making and –breaking (gated amplifiers H03F3/72; switching arrangements for exchange systems using static devices H04Q3/52)

Child Classifications

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• H03K 17/002
• H03K 17/04 Modifications for accelerating switching
• H03K 17/06 Modifications for ensuring a fully conducting state
• H03K 17/08 Modifications for protecting switching circuit against overcurrent or overvoltage
• H03K 17/10 Modifications for increasing the maximum permissible switched voltage
• H03K 17/12 Modifications for increasing the maximum permissible switched current
• H03K 17/13 Modifications for switching at zero crossing (generating an impulse at zero crossing H03K5/1536)
• H03K 17/14 Modifications for compensating variations of physical values, e.g. of temperature
• H03K 17/16 Modifications for eliminating interference voltages or currents
• H03K 17/18 Modifications for indicating state of switch
• H03K 17/20 Modifications for resetting core switching units to a predetermined state
• H03K 17/22 Modifications for ensuring a predetermined initial state when the supply voltage has been applied (bi-stable generators H03K3/12)
• H03K 17/26 Modifications for temporary blocking after receipt of control pulses
• H03K 17/28 Modifications for introducing a time delay before switching (modifications to provide a choice of time-intervals for executing more than one switching action H03K17/296)
• H03K 17/296 Time-programme switches providing a choice of time-intervals for executing more than one switching action and automatically terminating their operation after the programme is completed (electronic clocks comprising means to be operated at preselected times or after preselected time-intervals G04G15/00)
• H03K 17/30 Modifications for providing a predetermined threshold before switching (shaping pulses by thresholding H03K5/08)
• H03K 17/51 characterised by the components used (H03K17/04 - H03K17/30, H03K17/94 take precedence)
• H03K 17/94 characterised by the way in which the control signals are generated