Power supply generation circuit

Abstract

The present invention discloses a power supply generation circuit. The circuit comprises a diode 1, a diode 5, a fourth regulation transistor and an error amplifier. One input end of the error amplifier is earthed through a resistor 2, and is connected with an output end of the power supply generation circuit through a resistor 1; the other input end of the error amplifier is configured to receivereference voltage signals, an output end of the error amplifier is connected with a grid electrode of the fourth regulation transistor through a switching circuit, and an energy storage capacitor isconnected between the output end of the power supply generation circuit and the ground; the drain electrode of the fourth regulation transistor is configured to receive external pulse signals throughthe diode 1, the external pulse signals are used to charge the energy storage capacitor through the fourth regulation transistor and the diode 5, when the voltage of the energy storage capacitor reaches a set value, the charging to the energy storage capacitor by the external pulse signals is stopped, and when the voltage on the energy storage capacitor is lower than the set value, the external pulse signals charge the energy storage capacitor. The power supply generation circuit can be widely applied to a synchronous rectification circuit and an ACDC circuit design.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a power generation circuit. Background technique [0002] The power generation circuit is an integral part of each chip. It provides a suitable power supply voltage for the internal working circuit of the IC and has the function of suppressing the noise of the external power supply. At the same time, it distributes reasonable current and controls the functions of various parts inside the IC. consumption to achieve the purpose of reducing power consumption, which is of great significance in the current IC design of the Internet of Things. In the DC power supply, the power generation circuit can be realized by means of resistor divider, LDO and DCDC. However, in the case of only AC voltage, how to obtain a stable voltage source to ensure the internal operation of the IC is a matter worth considering. The traditional way is to use an external DC power supply or rectify the AC voltage outsi...

AI Technical Summary

Problems solved by technology

However, in the case of only AC voltage, how to obtain a stable voltage source to ensure the internal operation of the IC is a matter worth considering. The traditional way is to use an external DC power supply or rectify the AC voltage outside the IC through half-bridge rectification or full-circuit rectification. Bridge rectification, but there are some problems in these two methods. One is that an external power supply is required, which increases additional power consumption and additional costs, and the application is complicated; the other is that an external rectifier bridge is used to generate DC power, which will Generate additional large power consumption and other complex circuits for voltage regulation, which lead to complex applications and increased costs

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