Leakage current prevention circuit
AssigneeHon Hai Precision Industry Co., Ltd.
InventorYONG-ZHAO HUANG
Life of this patent
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Abstract
A leakage current prevention circuit for preventing a power source from being affected by leakage current includes a first transistor, and a second transistor. A gate of the first transistor receives a control signal and a source of the first transistor is grounded. A gate of the second transistor is connected to a drain of the first transistor, a drain of the second transistor is electrically connected to the power source, and a source of the second transistor is connected to a pull-up circuit which is connected to a chipset. When the chipset receives a drive signal, the control signal controls status of the first and second transistors so that the power source provides voltage to the pull-up circuit for the drive signal.
Claims12
A leakage current prevention circuit for preventing a power source from being affected by a leakage current, the leakage current prevention circuit comprising:
- a first transistor having a gate receiving a control signal, a source grounded, and a drain;
- and
- a second transistor having a gate connected to the drain of the first transistor, a drain electrically connected to the power source, and a source connected to a pull-up circuit which is connected to a chipset, wherein when the chipset receives a drive signal, the control signal controls status of the first and second transistors so that voltage from the power source is provided to the pull-up circuit for a pull-up voltage for the drive signal.
A circuit comprising:
- a pull-up circuit;
- a power source;
- and
- a control circuit connected between the pull-up circuit and the power source, the control circuit receiving a control signal, wherein the control signal controls the power source to provide voltage to the pull-up circuit or not, according to receipt of a drive signal by the pull-up circuit, thereby preventing the power source being affected by a leakage current from the pull-up circuit.
A circuit comprising:
- a pull-up circuit configured to electrically connect an electronic component with an external device which is configured for providing a drive signal to the electronic component via the pull-up circuit;
- a power source configured for providing voltage to the drive signal in the pull-up circuit to enhance driving ability of the drive signal;
- and
- a control circuit electrically connected between the pull-up circuit and the power source, the control circuit receiving a control signal in response to appearance and disappearance of the drive signal at the pull-up circuit and being capable of controlling the power source electrically connecting with the pull-up circuit or not according to the control signal, thereby preventing the power source being affected by a leakage current from the pull-up circuit.
Dependencies are inferred from the claim text.