Line frequency switching regulator

Details Line frequency switching regulator Line frequency switching regulator

2007-04-03

2007-04-03

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Zero switching

C363S086000

Reexamination Certificate

active

10509943

ABSTRACT:
In a switch mode power supply, a mains supply voltage source is coupled to a rectifier for producing an input supply voltage. The rectified input supply voltage is coupled unfiltered to an input of the SMPS. A switching power transistor having a controllable duty cycle is controlled by a duty cycle modulated signal for producing a regulated output supply voltage from the rectified input supply voltage. The periodic waveform of the mains supply voltage is used to establish the timings of the duty cycle modulated signal. In each cycle, current flow is initiated in the transistor, when the transistor is already fully turned on and a voltage developed between its main current conducting terminals is low or close to zero volts. When the output supply voltage attains the required level the transistor is turned off. Hysteresis is provided for preventing the transistor from turning on again in the same cycle, after it has been turned off.

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Paper Entitled “DC Power Supply,, MPB Series, Model 6282A, Serial Number Prefix 6G”, Hewlett Packard, 10 pages, no date.

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