Voltage signal detection results can be used to drive the output torque and voltage control, and overvoltage and undervoltage protection signal. Voltage signal detection available resistor divider, linear optocouplers, electric meter or Hall sensors and other methods.
(1) resistive divider method: a resistor divider network will be high, to obtain a low voltage scaling. This air circuit breaker is simple to use, but its accuracy is affected by the external environment (mainly temperature) greater impact, and isolation can not be achieved, if the feedback amount as the analog A / D Electric energy meter, the need for isolation amplifier. This method is suitable for low-voltage systems.
(2) voltage transformer France: with current transformer similar, only for testing AC voltage, suitable for high pressure systems.
(3) the Hall voltage sensor Law: Principles and Hall current sensor similar.
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