Protection circuit
AssigneesAutonetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
InventorsKeizou Ikeda, Kouichi Takagi, Shuji Mayama
Life of this patent
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Abstract
A protection circuit 10 has a diode 31 being connected in parallel to an inductive load 11 and having a forward direction set reverse to the conduction direction of a power supply current and a Zener diode 33 being placed between one terminal of the diode 31 and one terminal of the load 11 corresponding to the terminal of the diode and having a forward direction matched with the conduction direction of the power supply current.
Claims2
A protection circuit provided for a circuit configuration including an inductive load and an FET type transistor for controlling in the energization state of said load,
- said protection circuit comprising:
- a diode being connected in parallel to said load, and having a forward direction set reverse to a conduction direction of a power supply current to said load;
- and
- a Zener diode having a breakdown voltage greater than a power supply voltage being placed in a conducting path between one terminal of said diode and one terminal of said load corresponding to said terminal of said diode, and having a forward direction matched with the conduction direction of the power supply current.
Dependencies are inferred from the claim text.