Control circuit arrangement for a self-start power supply

Details Control circuit arrangement for a self-start power supply Control circuit arrangement for a self-start power supply

1982-07-01

1984-07-17

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 21, 323901, H02M 3335

Patent

active

044609515

ABSTRACT:
A switching regulator power supply operates at a variable high frequency with low power dissipation and a minimum of complexity. The transformer primary windings are included as part of a self-starting circuit which starts a pulse generator having a fixed frequency and variable pulse width. The self-starting circuit includes a control circuit network which connects to the transformer primary windings and a low voltage regulator circuit connects to the pulse generator and network. The control circuit network provides the voltage regulator circuit with the desired current characteristics of high instantaneous current during a short turn-on time interval and a zero current during power supply operation. The self-starting circuit in response to the input rectified AC power after the short turn-on period of time applies sufficient voltage which enables the pulse generator to begin generating a first output pulse. This causes the primary windings to store energy and feedback energy to the self-starting circuit which increases the voltage applied to the generator causing it to begin normal operation at maximum pulse width. The output DC supply voltage is compared to a reference voltage for generating an error signal which is used to adjust the width of the pulse generator to existing line and load conditions during power supply operation.

REFERENCES:
patent: 4037271 (1977-07-01), Keller
patent: 4063307 (1977-12-01), Stephens
patent: 4246634 (1981-01-01), Purol
C. J. Palmucci, "Switching Regulator Start-up Circuit", IBM Technical Disclosure Bulletin, vol. 19, No. 3, Aug. 1976.

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