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Overheating protection for switch power converter

A technology for switching converters and overheating protection, which is applied in the direction of emergency protection circuit devices and electrical components, and can solve the problems of sensing device temperature lagging power switching device temperature, time delay, and accuracy reduction

Inactive Publication Date: 2014-03-26
MOSWAY SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the thermistor across whatever thermal coupling exists between them, the temperature of the sensing device lags the temperature of the power switching device
[0005] This results in a time delay and loss of accuracy due to thermal gradients within the coupling device

Method used

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  • Overheating protection for switch power converter
  • Overheating protection for switch power converter
  • Overheating protection for switch power converter

Examples

Experimental program
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Embodiment Construction

[0023] figure 2 The figure shows a preferred controller circuit instead of IC1 in the prior art, which uses a constant current drive Switch on the double pole switching device. similar to figure 1 In IC1, block B1 handles normal switching operation, where the EN2 pin is used to shut down switching operation during an overheat condition. Block B2 is the circuit scheme that handles over-temperature protection (OTP).

[0024] In block B2, A1 is a differential-single-ended amplifier that amplifies the base-emitter voltage to a suitable level to determine the overheat protection trigger level and the recovery level after cooling.

[0025] A2 and A3 are comparators. Together with R1, R2 and R3, a threshold determination circuit is formed. Among them, R3×VREF / (R1+R2+R3) corresponds to the detection level of overheating, and (R2+R3)×VREF / (R1+R2+R3) corresponds to the detection level of recovery temperature. Two NOR gates and inverters after A2 and A3 are used for temperature s...

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Abstract

This invention discloses an overheating protection system protecting bipolar power switch transistor in a switch converter. When the base current is given, the voltage measurement between the base electrode and the emitting electrode of the bipolar power switch transistor is used as an indicator for contact temperature. The comparator receives voltage information and provides sampling control. An overheating protection bolt lock determines the normal operation state or the overheating state of the switch converter based on the output of the comparator.

Description

technical field [0001] The present invention provides an over temperature protection scheme (OTP) for protecting a power switching bipolar transistor in a power converter circuit. Background technique [0002] A desired safety feature in power conversion applications is to protect power switching devices from overheating conditions. For power conversion applications using bipolar devices for power switching, this is typically accomplished by thermally coupling the bipolar switching device to a sensing device. The sensing device may be an external positive temperature coefficient resistor or an external negative temperature coefficient resistor (PTC or NTC device), or may be a device within a switch controller IC such as a diode. The signal from the sensing device is then further processed by the controller circuit and compared to an appropriate threshold level to suspend circuit operation when the temperature exceeds a protecting level. Operation resumes when the temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10
Inventor 謝潮聲陳安邦鄧志强
Owner MOSWAY SEMICON