Design Of Power Supply System For Lead-Acid Batteries

Since the economic development,our demand for energy is also growing.At present,coal is still the main energy source in China,excessive use of coal is bound to cause a lot of environmental pollution,so we must save energy to reduce environmental pollution..The increasing demand for electricity has resulted in the phenomenon of peak valley electricity.When it is in peak power period,the supply of power supply system is in short supply,which may cause unstable power supply or even power outage.In valley power period,the supply of power supply system exceeds the demand,which will inevitably lead to waste of resources.The price difference between peak and valley is more than two times.In order to make full use of resources and reduce the cost of electricity consumption and achieve the effect of "peak-shaving and valley-filling".This paper presents a battery power supply system for household use,which stores energy during the valley power period and converts it into the whole household power supply during peak power period.The whole system includes charging module,inverting module and control module.The threeway staggered boost power factor correction circuit is used in the front stage and the ZVS phaseshifted full bridge is used in the back stage to improve the efficiency,improve the power factor and avoids polluting the power grid.The peak power of the charger can reach 3000 W,and the efficiency can reach about 92%.The multi-channel series push-pull boost circuit is used in the front stage,the full-bridge inverter circuit with unipolar SPWM is used in the back stage to achieve 50 Hz sine wave output.The peak power of the inverter can reach 3000 W,which can meet the basic needs of the family.Four 12V-100 AH lead-acid batteries are used as energy storage equipment.The main controller uses STM32,which is used to control power switching to realize charge-discharge switching during peakvalley period and three-stage charging control of storage battery.Using Wi Fi wireless communication,and using public network server for data forwarding to achieve remote monitoring.Finally,the whole system is tested and validated,and the expected goal is achieved through the performance test of the prototype and the analysis of the experimental waveform.