...52；键控；高压直流电源；移相选频 [gap=1054]Key words:birefringence teste;STC89C52RC;keying;high voltage DC power supply;frequency selection andphase shifting变化，但系统并没有产生新的谐波分量，从而降低了系统线性失真度。
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High-voltage DC Power Supply 直流高压电源
Host and high voltage DC power supply should be grounded with a separate branch lines, and they cannot be connected in series.
主机与高压直流电源应该用单独支线分别接地干线，不得串联连接。
We should always check the high voltage DC power supply within the current relay, time relay setting value is correct, control is sensitive.
应经常检查高压直流电源内电流继电器，时间继电器的整定值是否正确，控制是否灵敏。
DC DC convertors can convert the EV's high voltage DC power supply into the low voltage DC power supply. In order to design an excellent convertor one must be guided by theory of automatic control.
为了设计出在电动汽车上把高压直流电源变换成低压直流电源的高品质DC DC变换器，采用自动控制理论进行指导。
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