Isolation capability is a very important feature of DC/DC. The input/output isolation can provide independent, different polarity power to the load. It is often used in data processing and noise sensitive circuits. The load is isolated from the power supply and the system to prevent common mode. Disturbance, each in its own industry has proposed their own isolation characteristics requirements (eg: medical 4500VAC, power: 2500VAC)
Pictured:
CBARRIER: Isolation capacitor; input coupling capacitor of primary coil and output secondary coil;
RBARRIER: Isolation resistance; resistance between input and output, generally plus 500VDC voltage test;
I LEAKAGE: Leakage current; current induced at the input/output due to the presence of an isolation capacitor;
VBREAKDOWN: test voltage. This is 240VAC/60Hz; it can also be other values ​​or noise voltage;
CIS: isolation capacitor f: setpoint (test signal) Vtest: test signal voltage;
It can be seen from the above that a low-leakage, high-noise immunity, high-isolation DC/DC must require very low coupling capacitance isolating materials; the actual insulation test needs to comply with relevant regulations and special instruments, and the relevant isolation test parameters are:
Insulation strength: In the input and output isolation voltage (DC or AC peak) test 1 minute.
Insulation resistance: 500VDC is input and output, and the measured insulation resistance between input and output is greater than 1GOhm
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