Voltage clamp

Details Voltage clamp Voltage clamp

1997-10-29

1999-11-16

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 20, 363 16, H02H 7122, H02M 3335

Patent

active

059869054

ABSTRACT:
A voltage clamp for a single-ended flyback converter provides partial leakage energy recovery and noise suppression. The voltage clamp is an improved version of a conventional RCD clamp. The voltage clamp includes two switches with different turn-off speeds. The voltage clamp includes a capacitor and two resistors. One resistor is connected in parallel with a capacitor and the other resistor is connected in parallel with the faster switch. The faster switch enables at least partial recovery of energy dissipated in a clamp resistor immediately after turn OFF of the slower switch. When the main switch opens after the faster switch closes, noise in the circuit is suppressed by a damping resistor which thereby remains effectively in a current path after the faster switch has re-opened.

REFERENCES:
patent: 4016482 (1977-04-01), Cielo et al.
patent: 4389702 (1983-06-01), Clemente et al.
patent: 4688157 (1987-08-01), Rischmueller
patent: 4754385 (1988-06-01), McDade et al.
patent: 5621623 (1997-04-01), Kuriyama et al.
Huber et al., "Optimizing Flyback Topologies for Portable AC/DC Adapter/Charger Applications--Part I: Adapter/Charger Requirements", Power, Aug. 1996, pp. 68-75.
Tong et al., "External-Sync Power Supply with Universal Input Voltage Range for Monitors",Motorola Semiconductor Application Note, 1990, pp. 1-20.
Huber et al., "Optimizing Flyback Topologies for Portable AC/DC Adapter/Charger Applications--Part II: DC/DC Converter Design", Power, Sep. 1996, pp. 34-44.

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