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PCE
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DIFF Subgroup
H03K 4/501

the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator

Introduced: January 1995

Full Title

Full titles differ between systems:

IPC:

Generating pulses having essentially a finite slope or stepped portions > having triangular shape > having sawtooth shape > using as active elements semiconductor devices > in which a sawtooth voltage is produced across a capacitor > the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator

CPC:

Generating pulses having essentially a finite slope or stepped portions > having triangular shape > having sawtooth shape > using as active elements semiconductor devices (H03K4/787 - H03K4/84 take precedence) > in which a sawtooth voltage is produced across a capacitor > the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

IPC defines codes here since 1995.

Child Classifications

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  • H03K 4/502 the capacitor being charged from a constant-current source since 1995 IPC+CPC Available in IPC and CPC