Ground detecting apparatus and relay action detecting apparatus
AssigneeDelta Electronics, Inc.
InventorMing-Whang Wang
Life of this patent
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Abstract
A ground detecting apparatus at least includes a metal oxide semiconductor field effect transistor and a high voltage resistor. The metal oxide semiconductor field effect transistor is used to replace a photo-coupler for switching. The high voltage resistor is used for safety isolation. A relay action detecting apparatus at least includes a metal oxide semiconductor field effect transistor and a high voltage resistor. The metal oxide semiconductor field effect transistor is used to replace a photo-coupler for switching. The high voltage resistor is used for safety isolation.
Claims8
A ground detecting apparatus electrically connected to an alternating current power supply apparatus, the ground detecting apparatus comprising:
- a diode unit electrically connected to the alternating current power supply apparatus and generating a direct current voltage;
- a high voltage resistor comprising a first terminal and a second terminal, the first terminal of the high voltage resistor electrically connected to the diode unit, the second terminal of the high voltage resistor electrically connected to a first terminal of a first resistor, a second terminal of the first resistor electrically connected to a ground terminal;
- a metal oxide semiconductor field effect transistor comprising a drain, a gate and a source, the gate electrically connected to the high voltage resistor and the first resistor, the source electrically connected to the ground terminal;
- and
- a controller electrically connected to the drain,
- wherein the direct current voltage is divided by the high voltage resistor and the first resistor to obtain a judgment voltage to send to the gate;
- an on-off state of the metal oxide semiconductor field effect transistor is determined with the judgment voltage, and then a voltage level of the drain is changed to generate a pulse voltage signal;
- the controller performs detection according to the pulse voltage signal.
Dependencies are inferred from the claim text.