Over-temperature protection circuit and power supply chip
A technology of over-temperature protection circuit and bias circuit, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., and can solve the problem of limited application scenarios, impossibility, and differences in over-temperature protection threshold setting points Large and other problems, to achieve the effect of improving accuracy and consistency
Active Publication Date: 2021-01-01
SHANGHAI XINLONG SEMICON TECH CO LTD
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[0003]However, in power chip integrated circuits, the accuracy of the over-temperature protection threshold (which is a temperature value) generated by conventional over-temperature protection circuits is easily affected by process errors , resulting in large differences in the over-temperature protection threshold set point between chips, and cannot be applied to application scenarios that require high over-temperature protection threshold set points
Moreover, after the chip design is completed, its over-temperature protection threshold point is fixed, and it is not possible to change the chip’s over-temperature protection threshold setting point through the circuit design outside the chip, which leads to limited application scenarios.
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[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.
[0024] In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated Ground connection; it can be mechanical connection, electrical connection or mutual communication; it can be direct connection or indirect connection through an intermediary, and it can be the internal...
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The invention discloses an over-temperature protection circuit and a power supply chip adopting the same, which are realized by adopting a transistor integrated circuit manufacturing process, and theover-temperature protection circuit of the power supply chip is realized by detecting the temperature in the power supply chip and switching off the circuit in the power supply chip during over-temperature. Moreover, different detection currents are obtained through combined control of input signals of the current mirror, so that different over-temperature protection threshold setting points can be obtained, and the over-temperature protection requirements inside the power supply chip in various occasions can be met. Besides, a trimming circuit is arranged in the over-temperature protection circuit, and the influence of integrated circuit process errors on the over-temperature protection threshold precision is reduced by trimming the metal wires, so that the over-temperature protection threshold precision is improved, and the consistency of over-temperature protection threshold setting points between chips of the power supply chip is improved. Moreover, the over-temperature protectioncircuit can realize the over-temperature protection function with high precision, programmability and hysteresis function.
Description
technical field [0001] The present application relates to the technical field of power chips, in particular to an over-temperature protection circuit and a power chip. Background technique [0002] In power chip integrated circuits, it is often necessary to use an over-temperature protection circuit to detect the temperature inside the chip, so as to prevent the chip from being damaged by overheating. [0003] However, in the power chip integrated circuit, the accuracy of the over-temperature protection threshold (which is a temperature value) generated by the conventional over-temperature protection circuit is easily affected by the process error, which in turn causes the over-temperature protection threshold setting point between chips The difference is large, and it cannot be applied to the application scenario that requires a high set point of the over-temperature protection threshold. Moreover, after the chip design is completed, its over-temperature protection thresho...
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IPC IPC(8): H02H5/04H02H7/20H02H1/00
CPCH02H5/04H02H5/042H02H7/20H02H1/0007
Inventor 李瑞平池伟刘彬贾生龙王建虎
Owner SHANGHAI XINLONG SEMICON TECH CO LTD