There are two methods: one is to use a high-power transformer to convert 220V to DC 60V; The second is to use AC-DC power module to achieve voltage conversion.
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Voltage conversion method.
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The 220V AC output of the generator is turned into about 60V AC after the transformer depressurization, and then the output is direct current (voltage is slightly higher than 60V) after the rectifier bridge rectification and capacitor C filtering.
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The power of the transformer depends on the current of the battery car, if the current is within 10A, the rectifier bridge can be selected such as KBU1010 (its parameter is 10A \/ 1000V).
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Several 4700μF \/ 100V electrolytic capacitors can be selected for the filter capacitor C in parallel. The input voltage of the AC-DC power conversion module ranges from 100 to 265V\/AC, and the frequency ranges from 47 to 63Hz. The output DC voltage can be adjusted as required. The output power of the module has various specifications and can be selected as required.
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This power module is generally equipped with overvoltage protection and output short-circuit protection, and the use is more reliable.
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The idea of rectifier through bridge circuit after voltage reduction by transformer seems correct, but there are many drawbacks. At present, most 60V batteries are lithium batteries, with built-in management circuits, which need to control the current voltage and charging mode of the charging machine to prevent overcharge fire.
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The bridge rectifier circuit is a diode, can not control the charging current, direct charging is equivalent to the constant voltage floating charge of the battery pack, easy to overcurrent.
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Coupled with the unstable power supply of 220v, the voltage may be increased to 230 to 240V during the low power consumption period at night, and the low-voltage output end is overvoltage, directly charging the battery, which will lose the service life and leak the fire.