Switching control circuit for single chip microcomputer

Abstract

The invention discloses a switching control circuit for a single chip microcomputer. The switching control circuit comprises a resistor R1, a light emitting diode (LED), a key switch SB, a capacitor C1, a diode D1 and a triode VT1, wherein one end of the resistor R1 is connected with a power supply VCC and the transmitting electrode of a triode VT2 separately; the base electrode of the triode VT2 is connected with the resistor R1 and a resistor R2 separately while the other end of the resistor R2 is connected with the positive electrode of the LED and the key switch SB separately; the negative electrode of the LED is connected with the collector electrode of a triode VT3; the base electrode of the triode VT3 is connected with a resistor R4; and the other end of the resistor R4 is connected with a resistor R3, the capacitor C1 and the IO2 port of the single chip microcomputer. According to the switching control circuit for the single chip microcomputer provided by the invention, the key switch SB is matched with multiple triodes to be used as the power-on and power-off control elements of the single chip microcomputer; the circuit structure is quite simple; and in addition, the switching control circuit can effectively control the power supply of the single chip microcomputer and can realize zero stand-by power consumption.

Description

technical field [0001] The invention relates to a switch circuit, in particular to a single-chip microcomputer switch control circuit. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronics technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation control single-chip microcomputer and MOSFET. With the development of power electronics technology and Innovation, making switching power supply technology is also constantly innovating. At present, switching power supply is widely used in almost all electronic devices due to its small size, light weight and high efficiency. Components, and their power switch control has always been the focus of research in the industry. In many existing single-chip system switching circuits, it is impossible to completely turn off the power supply and achieve zero power consumpti...

AI Technical Summary

Problems solved by technology

At present, switching power supply is widely used in almost all electronic devices due to its small size, light weight and high efficiency. Components, its power supply switch control has always been the focus of research in the industry. In many existing single-chip system switching circuits, it is impossible to completely turn off the power supply and achieve zero power consumption standby.

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