Overvoltage protection circuit for use in charger circuit system and charge circuit with overvoltage protection function
First Claim
1. An overvoltage protection (OVP) circuit for use in a charger circuit system, comprising:
- a power transistor electrically connected between a voltage supply and a battery;
an OVP control circuit, which turns off the power transistor when the voltage supply exceeds a threshold value; and
a multiplexing circuit electrically connected between an output of the OVP control circuit and a gate of the power transistor.
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Accused Products
Abstract
The present invention discloses an overvoltage protection (OVP) circuit for use in a charger circuit system, comprising: a power transistor electrically connected between a voltage supply and a battery; an OVP circuit which turns off the transistor when a voltage supply exceeds a threshold value; and a multiplexing circuit electrically connected between an output of the OVP circuit and the gate of the transistor. The present invention also discloses a charger circuit with an OVP function, comprising: a single power transistor electrically connected between a voltage supply and a battery; an OVP control circuit which turns off the power transistor when a voltage supply exceeds a threshold value; and a charger control circuit which controls the gate of the power transistor to determine a charge current to the battery when the voltage supply does not reach the threshold value.
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Citations
10 Claims
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1. An overvoltage protection (OVP) circuit for use in a charger circuit system, comprising:
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a power transistor electrically connected between a voltage supply and a battery; an OVP control circuit, which turns off the power transistor when the voltage supply exceeds a threshold value; and a multiplexing circuit electrically connected between an output of the OVP control circuit and a gate of the power transistor. - View Dependent Claims (2, 3, 4, 5)
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6. A charger circuit with overvoltage protection (OVP) function, comprising:
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a single power transistor electrically connected between a voltage supply and a battery, and no more power transistor is electrically connected therebetween; an OVP control circuit which turns off the power transistor when a voltage supply exceeds a threshold value; and a charger control circuit which controls a gate of the power transistor to determine a charge current to the battery when a voltage supply does not exceed the threshold value; and
a multiplexing circuit electrically connected between an output of the OVP control circuit and a gate of the power transistor. - View Dependent Claims (7, 8, 9, 10)
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Specification