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Short-circuit detection circuit and method, and power supply device including the short-circuit detection circuit

A short-circuit detection and power supply technology, which is applied in the direction of conversion equipment, measuring electricity, and circuit devices with intermediate conversion to AC, and can solve problems such as load short-circuits

Active Publication Date: 2019-05-21
FAIRCHILD KOREA SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The load is connected to the output of the power supply and a short circuit may occur in the load

Method used

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  • Short-circuit detection circuit and method, and power supply device including the short-circuit detection circuit
  • Short-circuit detection circuit and method, and power supply device including the short-circuit detection circuit
  • Short-circuit detection circuit and method, and power supply device including the short-circuit detection circuit

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Embodiment Construction

[0035] In the following detailed description, certain exemplary embodiments of the invention have been illustrated and described, by way of illustration only. As those skilled in the art would know, the illustrated embodiments may be modified in various ways, all within the spirit or scope of the invention. Accordingly, the drawings and descriptions are illustrative in nature and not restrictive. Like symbols denote like elements throughout the specification.

[0036] Throughout the specification and appended claims, when it is described that an element is "connected" to another element, the element may be "directly connected" to the other element or "electrically connected" through a third element to the other component. Additionally, the word "comprise" and variations thereof should be understood to indicate the inclusion of stated elements but not the exclusion of any other elements, unless there is an explicit statement to the contrary.

[0037] In the following, refere...

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PUM

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Abstract

A short-circuit sense circuit and a power supply according to an exemplary embodiment of the present invention use an auxiliary voltage, which is a both-end voltage of an auxiliary coil coupled with a predetermined turn ratio to a secondary side coil coupled to an output voltage. After termination of a start-up period, the short-circuit sense circuit samples a sense voltage, which is a voltage of a node between a first sense resistor and a second sense resistor coupled in series to both ends of the auxiliary coils and determines whether a short-circuit occurs according to a short-circuit sense signal that depends on a result of comparison between the sampled voltage and a predetermined reference voltage.

Description

technical field [0001] The invention relates to a short circuit detection circuit, a short circuit detection method and a power supply including the short circuit detection circuit. Background technique [0002] A load is connected to the output of the power supply, and a short circuit may occur in the load. When the load is short-circuited, the short-circuit protection operation of the power supply is triggered to prevent the power supply from failing. [0003] For example, when a string of light emitting diodes (LEDs) connected as a load at the output of the power supply is short-circuited, the power supply should detect the short circuit of the LED string and trigger a protection operation. In detail, the power supply can stop the power supply by stopping the switching operation. [0004] In order to trigger such a short circuit protection operation, a short circuit of the load should be detected. [0005] The above information disclosed in this Background section is o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02H02M3/28H02H7/12
CPCH02M1/32H02M1/4258H02M3/33507H02H3/08H02H9/02H02H9/025H02M3/33515Y02B70/10
Inventor 严炫喆朴仁琪
Owner FAIRCHILD KOREA SEMICON