Power control circuit

Abstract

The invention provides a power control circuit. The power control circuit comprises a control chip, a chip enable input end and a control module, the control chip includes a working voltage input end, the working voltage input end is electrically connected to a first power voltage through a series connection module formed by M diodes, when the voltage of the chip enable input end is higher than an enable voltage threshold value, the control chip outputs a second power voltage, the control module is provided with a control input end and a control output end, the control input end and the control output end are electrically connected to the first power voltage and the chip enable input end respectively, and when the voltage value of the working voltage input end is lower than the working voltage threshold value of the control chip, the voltage value of the chip enable input end is lower than the enable voltage threshold value. By means of the power control circuit, the control input end is electrically connected to the first power voltage, the control output end is electrically connected to the chip enable input end, and when the voltage value of the working voltage input end of the control chip is lower than the working voltage threshold value, the voltage value of the enable input end of the control chip is lower than the enable voltage threshold value.

Description

technical field [0001] The invention relates to the output control technology of a DC power supply, in particular to a power supply control circuit in the DC power supply. Background technique [0002] In the prior art, a special power conversion chip is usually used for control in the circuit design of the DC power supply. Generally, the power conversion chip has a power-on working voltage V CC and chip enable voltage V EN , when the power-on operating voltage V CC When the rate of rise is large enough, the power conversion chip first reaches the normal power-on working voltage, and then the chip enable voltage V EN Satisfy the predetermined enabling threshold, so that the chip outputs the desired DC voltage, such as 5V. [0003] However, during the voltage measurement process, the slope of the power-on working voltage of the chip is relatively small, and the voltage value of the working voltage end of the chip electrically connected to it rises relatively slowly. When...

AI Technical Summary

Problems solved by technology

[0003] However, during the voltage measurement process, the slope of the power-on working voltage of the chip is relatively small, and the voltage value of the working voltage end of the chip electrically connected to it rises relatively slowly. When the normal operating voltage is reached, it is possible that the chip enable voltage V EN The predetermined enable threshold has been met, so that the DC voltage output by the chip does not meet the expected voltage value

For example, suppose the power-on working voltage threshold of the chip is 5V, and the chip enable voltage threshold is 2V. When the voltage displayed on the chip’s working voltage terminal is 3.9V, if the voltage displayed on the chip V, then, the voltage timing at this time is that the chip enable signal arrives earlier than the normal power-on signal, which is obviously inconsistent with the normal logic timing, and this abnormal timing is likely to cause the actual output voltage to deviate from the expected voltage value

Images