Control circuit for the switch in a switching power supply

A technology for control circuits and switching power supplies, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve the problems of increasing the cost, complexity and required space of control circuits, saving terminals and improving voltage control. Effect
CN1848645AInactive Publication Date: 2006-10-18FRIWO MOBILE POWER GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FRIWO MOBILE POWER GMBH
Publication Date
2006-10-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a control circuit and related method for controlling the output voltage of a controllable switching power supply. The switching power supply includes a primary-side switch and a transformer with auxiliary windings. After the primary-side switch is turned on, an auxiliary voltage that reflects the output voltage is induced in the auxiliary winding. The induced voltage is input to the control circuit as a control variable. In order to provide a control circuit that requires as few external components as possible, can be manufactured at low cost and requires as little space as possible, the driver output of the control circuit is connected to the control input of the primary side switch, the control circuit is designed as The switching frequency of the primary-side switch is adjusted by the auxiliary voltage, wherein the correlation constant factor between the switching frequency and the auxiliary voltage is selected, so that the output current of the switching power supply selects a preset value, and the driver output terminal is also connected to the comparator input to determine the current through this primary side switch.
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Description

technical field

[0001] The invention relates to a control circuit and a related method for controlling the output voltage of a controllable switching power supply. The switching power supply includes a primary-side switch and a transformer with an auxiliary winding (winding). After the primary-side switch is turned on, an auxiliary voltage reflecting an output voltage is induced in the auxiliary winding. The voltage induced in the auxiliary winding is provided as a control variable to the control circuit. The invention also relates to a related switching power supply. Background technique

[0002] Typically, known switching power supplies use power transistors as switches to provide pulsed current to a network of inductive and capacitive energy storage elements that convert the switched current pulses into a controlled DC voltage. Depending on the mode of operation of the switching power supply, the switching power supply can provide an output voltage that is greater than,...

Claims

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