Low power consumption power control circuit and method

Abstract

The invention discloses a low power consumption power control circuit and method. The circuit comprises two NPN type audions Q1 and Q2, a P channel MOS tube Q3, a power source BT1, a power management chip U1 and a touch key S1. According to the circuit, a battery is adopted for supplying power, the touch key carries out triggering control over starting of the power source, the two NPN type audions Q1 and Q2 jointly control the grid of the P channel MOS tube Q3, and therefore the control purposes of low power consumption triggering starting and stopping according to needs are achieved. When the power source on a load needs to be turned off, the output level of the power management chip U1 is changed into a low level, the audion Q2 enters a cut-off state, the grid of the P channel MOS tube Q3 is at high potential, the MOS tube is in a cut-off state, loading loop power supply is cut off, the management chip enters a physical power down mode, and just weak leakage currents exist.

Description

technical field [0001] The invention relates to a low power consumption power supply control circuit and method. Background technique [0002] With the development of miniaturization and portability of electronic equipment, the requirements for battery volume are also increasing. The traditional mode of large capacity and high battery life is gradually developing to low energy consumption and high battery life. In this application scenario, a low power consumption Power control devices are promising. [0003] In current practical applications, the typical power consumption current of an entire circuit board using a low power consumption power control device is generally at the mA level. On embedded devices that use portable energy sources such as button batteries, the existing mA-level power consumption is still unsatisfactory; in existing products that can monitor the switch state, the actual measurement of the current state of the ST main control in the state to be trigge...

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Problems solved by technology

[0004] The present invention proposes a low power consumption power supply control circuit and method, the purpose of which is to overcome the problems in the above-mentioned prior art that the power consumption of the power control device is as high as mA level and the power control stability is poor

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