Malfunction detecting circuit and malfunction detecting method for detecting malfunction of current-sensing resistor, and power converting system applying the malfunction detecting circuit
AssigneeLeadtrend Technology Corp.
InventorChun-Liang Lin
Life of this patent
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Abstract
A malfunction detecting circuit for detecting malfunction of a current sensing resistor includes a reference-voltage generating circuit and a comparing circuit, wherein the reference-voltage generating circuit is utilized to generate a reference voltage signal varying with the on time period of a power switch of a power converting system. The comparing circuit compares a sensing voltage signal corresponding to a current flowing through the current sensing resistor with the reference voltage signal to generate a comparing result indicating whether the malfunction occurs.
Claims20
A malfunction detecting circuit for detecting malfunction occurring to a current sensing resistor, comprising:
- a reference-voltage generating circuit, for generating a reference voltage signal varying with an on time period of a power switch;
- and
- a comparing circuit, for comparing a sensing voltage signal with the reference voltage signal to generate a comparing result indicating whether the malfunction occurs, wherein the sensing voltage signal corresponds to a current flowing through the current sensing resistor.
A method for detecting malfunction occurring to a current sensing resistor, comprising:
- generating a reference voltage signal varying with an on time period of a power switch;
- and
- comparing a sensing voltage signal with the reference voltage signal to generate a comparing result, and determining whether the malfunction occurs according to the comparing result, wherein the sensing voltage signal corresponds to a current flowing through the current sensing resistor.
Dependencies are inferred from the claim text.