Low-power consumption driven PWM regulation circuit

Abstract

The invention relates to a low-loss regulator circuit for driving the PWM; the invention comprises an LC oscillatory circuit consisting of a driving circuit, a capacitance C and a inductance L which are connected in series, a switch tube T1, a switch tube T2, a capacitance C1, a capacitance C2, an MCU controller and a current sampling magnetic ring; the MCU controller regulates the opening and closing sequence according to the working frequency and the switch tube can reduce the current loss in the opening and closing process. The invention overcomes the defect that the switch tube of the present electronic ballast is great and the temperature rises greatly. The invention changes the state that the working frequency of the present electronic ballast is basically unchanged from the beginning to the end; with the invention, the opening and closing sequence and working frequency are changing in the process of the different operational stages according to the light features.

Description

technical field [0001] The invention relates to a regulating circuit, in particular to a driving regulating circuit for high-pressure sodium lamps and metal halide lamps. Background technique [0002] The rise of the green lighting industry in the world makes electronic ballasts popular. Relevant enterprises have all spotted the huge business opportunities hidden in electronic ballasts. In particular, the energy-saving potential hidden in the high-pressure sodium lamp is more concerned by everyone. The high-pressure sodium lamp (HPS lamp) is a high-intensity gas discharge lamp (HID lamp) with excellent performance. Its advantages are high luminous efficiency, long life, and good light color. , so it is widely used. According to statistics, if all high-pressure gas discharge lamps in the country are replaced with electronic ballasts, 24.6 billion kWh of electricity can be saved throughout the year, which can solve the current 1 / 3 of the country's electricity shortage. The...

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Problems solved by technology

Due to the storage effect of the transistor base area, the turn-off time is delayed; the collector junction capacitance makes the output pulse current have a bad influence on the input terminal; especially the pulse transformer in the input circuit, when the half-bridge inverter circuit is working, the switching current is in the Ringing occurs in the primary winding, and the combined force of its positive peak value and the positive charge stored in the base area causes the switching tube to be delayed to turn off, or to be repeatedly turned on, which causes "common state conduction". If it is hot, it will enter the second breakdown when it is turned on, and any protection circuit will be powerless against it.

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