Over-temperature protection circuit and power supply circuit
An over-temperature protection circuit and over-temperature protection technology, which can be applied to emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., and can solve problems such as the inability to adjust the over-temperature intensity
Pending Publication Date: 2020-01-17
JOULWATT TECH INC LTD
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Problems solved by technology
[0004] In view of this, the object of the present invention is to provide an over-temperature protection circuit and a power supply circuit that perform over-temperature protection with different strengths according to different temperature protection temperatures, so as to solve the technical problem that the over-temperature strength cannot be adjusted in the prior art
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[0022] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.
[0023] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.
[0024] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...
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The invention discloses an over-temperature protection circuit and a power supply circuit, and the over-temperature protection circuit comprises a charging and discharging circuit which is used for generating a slope signal; and a comparison circuit which is used for receiving the slope signal and a reference signal, comparing the slope signal with the reference signal and then outputting a firstcontrol signal, wherein when the temperature reaches a first over-temperature protection point, the slope of the slope signal is reduced by a first amplitude, and when the temperature reaches a secondover-temperature protection point, the slope of the slope signal is reduced by a second amplitude; the second over-temperature protection point is higher than the first over-temperature protection point, and the second amplitude is greater than the first amplitude; and the first control signal is adjusted by reducing the slope of the ramp signal. According to the invention, a plurality of over-temperature protection points are arranged, and different intensities of adjustment can be carried out at different over-temperature protection temperatures.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to an over-temperature protection circuit and a power supply circuit. Background technique [0002] Over-temperature protection is an important protection function in circuit applications, and corresponding over-temperature protection circuits will be installed in occasions that require over-temperature protection. The over-temperature protection circuit in the prior art generally includes a temperature sampling module and a preset over-temperature protection reference value. When the sampling circuit operating temperature reaches the over-temperature protection reference value, it will start or trigger the over-temperature protection, thereby issuing an over-temperature protection. Temperature protection signal or command. According to the over-temperature protection signal or instruction, the current limiting protection can be carried out by means of current limiting or...
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IPC IPC(8): H02M1/32H02H5/04H02H7/10
CPCH02M1/32H02H5/04H02H7/10H02M1/327
Inventor 孙明波周逊伟
Owner JOULWATT TECH INC LTD