Controlled starting circuit

Abstract

The invention relates to a controlled starting circuit which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a first diode, a first voltage-stabilization pipe, a second voltage-stabilization pipe, a first transistor, a second transistor, a PWM starting circuit, a controllable precision voltage-stabilization source and a transformer winding. The controlled starting circuit is simple in structure, light in weight and easy to minimize, delay time exists between inputting of external signals and starting of the PWM starting circuit, and the delay performance can effectively prevent self-excitation vibration.

Description

technical field [0001] The invention relates to the field of circuit control, in particular to a controlled starting circuit. Background technique [0002] After the switch regulated power supply (hereinafter referred to as the switching power supply) came out, it gradually replaced the linear regulated power supply and the thyristor phase-controlled power supply in many fields. The series switching power supply appeared in the early stage, and its main circuit topology is similar to that of a linear power supply, but the power transistor works in a switching state. [0003] The control circuit of the switching regulated power supply has become very simple due to the development of integrated chip technology, and the power supply of this integrated circuit is greatly affected by the circuit composition, the number of components and the packaging area. There are roughly two ways to control the supply of starting power. The output voltage detection power supply common circuit...

AI Technical Summary

Problems solved by technology

There are roughly two ways to control the supply of starting power. The output voltage detection power supply common circuit and the PWM (pulse width modulation) circuit power supply, and the output voltage detection power supply common circuit auxiliary power inverter has many circuit components. When using a frequency transformer, the size and weight are relatively large, which cannot prevent self-excited oscillation

[0004] The PWM circuit and the power supply of the output voltage detection circuit are independent circuits. This circuit is powered by the auxiliary winding of the main transformer after the inverter is started, and the secondary side voltage is also powered by the auxiliary winding. The disadvantage is that the primary and secondary sides need to be isolated. , resulting in a higher input voltage, which cannot be applied to the integrated controller

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