Switch power supply,control circuit and control method of output voltage of controllable switch power supply

A technology of control circuit and switching power supply, which is applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., which can solve the problems of increasing the cost, complexity and required space of the control circuit , to achieve the effect of saving terminals and improving voltage control
CN100555828CInactive Publication Date: 2009-10-28FRIWO MOBILE POWER GMBH
12 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FRIWO MOBILE POWER GMBH
Publication Date
2009-10-28
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

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. After the primary-side switch is turned on, an auxiliary voltage reflecting 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 Relying on the auxiliary voltage to adjust the switching frequency of the primary-side switch, 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 output terminal of the driver is also directly connected to a comparison input to the primary-side switch to determine the current through the primary-side switch.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More