Abstract
With microelectronic technology and technology, magnetic materials science and processing technology and the other edge of sintering technology of continuous improvement and rapid development, the switch regulated power supply has made a breakthrough, and resulting in many can improve people's living standard and the improvement of people working conditions in the new products, such as electric bicycles, motor, frequency conversion stepless speed change air conditioning, inverter welding machine, quick charger, electric locomotive and electric smelting equipment. Switch power supply with its unique has the advantages of small volume, light weight, high efficiency, and high power factor, output form a diverse and wide voltage stabilizing range and other features have penetrated into the electrical fields. DC switching regulator used in the large power switch device is more expensive, the control circuit is also more complex. Transistor and integrated device of electric heat shock tolerance, but less capable, hence the need for over current protection circuit. This design is the use of TL494chip control pulse width to achieve a stable voltage output. The use of TL494switching power supply PWM generator, using MOSFET or IGBT as circuit switching device, composed of LC circuit output filter, but also high inductance as an energy storage inductance, the switching impulse voltage integrated into a smooth and stable voltage output. Due to the power supply the needs of a variety of output voltage, so in the form of TL494used in the feedback loop of controllable circuit, single-chip microcomputer to control the use of DA converter as a feedback voltage, in monitoring the output level voltage, use the AD converter read at any time monitoring the output voltage level. Thus to achieve a substantially closed loop monitoring circuit. All output can be through the MCU programming.
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