Electric circuit
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A functional element is prevented from breakdown and deterioration because of mounting and demounting of the functional element immediately after cut-off of driving power from a constant-current power supply or during supply of the driving power.
An electric circuit is configured to electrically connect a constant-current power supply 1 having a capacitance between an output terminal and a reference potential terminal and a detachable functional element 2 to each other. The electric circuit has an element breakdown prevention circuit 10 having a first circuit terminal connected to an output terminal of the constant-current power supply 1 through the functional element 2, and a second circuit terminal connected to the reference potential terminal of the constant-current power supply 1 through the functional element 2. The element breakdown prevention circuit 10 increases an impedance between the circuit terminals to a disconnected state impedance in response to a transition from a connected state, in which the functional element 2 is mounted, to a disconnected state, in which the functional element 2 is removed. The element breakdown prevention circuit 10 decreases the impedance between the circuit terminals to a connected-state impedance in response to a connection state transition.
-
Citations
9 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. 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 provided between the constant-current power supply and the functional element, and wherein; a state in which the functional element is demounted is defined as a disconnected state, and a state in which the functional element is mounted is defined as a connected state; an impedance between a first circuit terminal and a second circuit terminal of the element breakdown prevention circuit is increased self-adjustingly to a disconnected state impedance in response to a state transition from the connected state to the disconnected state; and an impedance between the first circuit terminal and the second circuit terminal is decreased 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.
-
Specification