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Method and circuit for operating a switching power supply

A technology of switching power supply and power supply, which is applied in the direction of electrical components, adjusting electrical variables, high-efficiency power electronic conversion, etc., and can solve problems such as output voltage reduction

Active Publication Date: 2021-02-05
TEXAS INSTR INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Switching is disabled when the output voltage is greater than the reference voltage, which causes the output voltage to drop

Method used

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  • Method and circuit for operating a switching power supply
  • Method and circuit for operating a switching power supply
  • Method and circuit for operating a switching power supply

Examples

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Embodiment Construction

[0014] In the drawings, the same reference numerals indicate similar or equivalent elements. The illustrative ordering of acts or events is not limiting, as some acts or events may occur in different orders and / or concurrently with other acts or events. Furthermore, some of the illustrated acts or events are optional for implementing the methods in accordance with this description. The circuits and methods described herein work with existing power supplies to disable or disable certain components when they are not in use.

[0015] figure 1 is a block diagram of a power supply 100 with power supply control circuitry 102 associated therewith. Power supply 100 operates with on / off control techniques as described herein. The power supply 100 includes a switching circuit 110 that controls the current I through the primary side of the converter T11 as described herein. T1 . The switch circuit 110 includes a switch, such as a transistor, which selectively enables the current I ...

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Abstract

In the described example of the controller and method for controlling a power supply, the controller (310) includes a comparison circuit (102) operable to compare the switching frequency of the controller (310) with a predetermined switching frequency . The voltage measurement circuit (324) is operable to measure the output voltage of the power supply (300). The circuit (352) is operable to disable at least one component of the power supply (300) in response to the switching frequency being less than the predetermined switching frequency and the output voltage being greater than a predetermined output voltage.

Description

Background technique [0001] The switching power supply generates an output voltage on the secondary side of the converter by switching the current through the primary side of the converter. A simple control method for switching power supplies is on / off control, where switching is based on a control loop between the primary and secondary sides of the converter. On / off control does not require control loop compensation, but only a comparator to close the loop. If the output voltage is lower than the reference voltage measured by the comparator, switching is enabled, which increases the output voltage. When the output voltage is greater than the reference voltage, switching is disabled, which causes the output voltage to drop. In some embodiments, the switching frequency and duty cycle of the switching are fixed, and switching is disabled whenever the output voltage exceeds the reference voltage. Contents of the invention [0002] In an example of the described controller an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/33507Y02B70/10H02M1/0035H02M1/0048H02M1/0009H02M1/32H02M3/335H02M1/08H02M3/33515
Inventor R·斯特拉夸蒂娜A·阿莫罗索S·琼班科
Owner TEXAS INSTR INC
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