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Electric circuit

  • US 8,508,902 B2
  • Filed: 01/28/2009
  • Issued: 08/13/2013
  • Est. Priority Date: 01/31/2008
  • Status: Expired due to Fees
First Claim
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1. An electric circuit for electrically connecting a constant-current power supply and a detachable functional element to each other, the constant-current power supply having a capacitance between an output terminal and a reference potential terminal, and the detachable functional element being configured to exhibit a predetermined function based on electric power from the constant-current power supply, comprising:

  • an element breakdown prevention circuit having a first circuit terminal connected to the output terminal of the constant-current power supply via the functional element and a second circuit terminal connected to the reference potential terminal of the constant-current power supply,the electric circuit being characterized in that;

    the electric circuit has a disconnected state in which the first circuit terminal and the output terminal of the constant-current power supply are electrically disconnected by demounting of the functional element and a connected state in which the first circuit terminal and the output terminal are electrically connected to each other by mounting of the functional element;

    the element breakdown prevention circuit increases an impedance between the first circuit terminal and the second circuit terminal self-adjustingly to a disconnected state impedance in response to a state transition from the connected state to the disconnected state; and

    the element breakdown prevention circuit decreases the impedance between the first circuit terminal and the second circuit terminal self-adjustingly to a connected-state impedance that is lower than the disconnected-state impedance in response to a state transition from the disconnected state to the connected state.

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