Application of C8051F920 single chip microcomputer in the design of metal halide lamp controller-EEWORLD

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1. Introduction

At present, most lighting equipment still uses traditional energy for lighting. Making full use of solar energy as the energy supply for lighting equipment is of great significance in terms of saving energy and protecting the environment.

2. Overall structure of controller

The solar photovoltaic panel is connected to the photovoltaic signal processing circuit, and the photovoltaic voltage is sent to the 12 V battery through the PWM charging control circuit. During normal operation, the 12 V battery output voltage is boosted and rectified by the secondary induction of the high-frequency planar transformer to the full-bridge circuit. At the same time, the 12 V output voltage is connected to the voltage conversion circuit to supply power to other circuits of the controller.

2.1 Solar Charging System

The photovoltaic signal processing circuit includes a signal reverse connection protection circuit, a photovoltaic voltage sampling circuit and a lightning protection circuit. Among them, the signal reverse connection protection circuit can prevent the photovoltaic signal reverse connection input from damaging the controller circuit. The voltage sampling circuit provides the sampled photovoltaic voltage signal to C8051F920. The lightning protection circuit can prevent lightning and lightning in the sky from being introduced into the controller and causing damage. The PWM charging control circuit will charge the battery. The PWM signal output by the MCU is used to drive the high-power MOS tube to control the size of the charging voltage to avoid damage to the battery.

2.2 Electronic ballast circuit design

2.3 Design of ignition circuit

Since the metal halide lamp is filled with inert gas, its breakdown voltage is very high, usually required to reach about 20 kV, so the ignition circuit is required to provide a sufficiently high voltage. Based on this, by connecting the secondary of the transformer to the triple voltage ignition circuit shown in Figure 4, a voltage of 1200 V can be obtained, and after connecting it to the metal halide lamp through the lighting coil, a lighting voltage of about 20 kV can be obtained at the two poles of the metal halide lamp.

3 Charging system software design

Keywords：C8051F920 Reference address：Application of C8051F920 single chip microcomputer in the design of metal halide lamp controller

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