Over-temperature delay protection circuit with wide power voltage range

A protection circuit, wide power supply technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of lack of start-up circuit in the circuit, the circuit cannot work normally, and the accuracy of the current mirror is not high, so as to improve the input range, The effect of reducing errors
CN104679092AInactive Publication Date: 2015-06-03UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2015-06-03
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides an over-temperature delay protection circuit with a wide power voltage range. The over-temperature delay protection circuit comprises a starting circuit module, an I<PTAT (proportional to absolute temperature)> current generating circuit module, a reference voltage module, an over-temperature detection module and a cascade inverter module. Output currents of the starting circuit module are provided to an input end of the I<PTAT> current generating circuit module, output voltages of the I<PTAT> current generating circuit module are provided to an input end of the reference voltage module and an input end V<1> of the over-temperature detection module, output voltages V<ref (reference)> of the reference voltage module are provided to an input end V<2> of the over-temperature detection module and an input end of the starting circuit module, and output voltages of the over-temperature detection module are provided to an input end of the cascade inverter module; output voltages V<3> of the cascade inverter module are provided to an input end V<4> of the over-temperature detection module. The over-temperature delay protection circuit has the advantages that I<PTAT> currents can be precisely mirrored by the reference voltage module and the over-temperature detection module, current errors between the reference voltage module and the over-temperature detection module can be reduced, accordingly, jumping temperatures are hardly shifted, and the power voltage input range can be expanded.
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Description

technical field

[0001] The invention relates to the technical field of integrated circuits, in particular to an over-temperature hysteresis protection circuit suitable for wide power supply voltage. Background technique

[0002] Over-Temperature-Protection (OTP) circuit is an integral part of modern power management chips, and its characteristic is that if the circuit temperature exceeds the threshold T H , the circuit generates a signal to turn off the power tube and other devices; when the temperature returns to T L , the circuit generates a signal to turn on the power tube. The main technical indicators of the OTP circuit include: power supply voltage range, thermal oscillation, etc.

[0003] figure 1 It is an existing OTP circuit structure. where M 1 -M 4 , Q 0 , Q 1 , and the resistor R 0 Constitute a proportional to absolute temperature (Proportional To Absolute Temperature, PTAT) current generation circuit. m 5 , R 1 and Q 3 Constitute the reference volta...

Claims

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