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US 11,309,888 B2Granted
Reverse current switch
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorMengwen Zhang
Life of this patent
Estimating the term…
Abstract
Provided is a reverse current switch. The reverse current switch includes: a comparison unit including a first input end, a second input end, and a first output end; and a switch resistance unit, where a first end of the switch resistance unit is connected to the first input end, a second end of the switch resistance unit is connected to the second input end, and a third end of the switch resistance unit is connected to the output end of the comparison unit, and the switch resistance unit is controlled by a voltage of the first output end. This reverse current switch has a simple structure and can implement working under low voltage conditions.
Claims17
A reverse current switch, comprising:
- a comparison unit comprising a first input end, a second input end, and a first output end;
- and
- a switch resistance unit, wherein a first end of the switch resistance unit is connected to the first input end, a second end of the switch resistance unit is connected to the second input end, and a third end of the switch resistance unit is connected to the first output end,
- wherein the switch resistance unit is controlled by a voltage of the first output end;
- when a voltage of the first input end is greater than a voltage of the second input end, the voltage of the first output end controls the switch resistance unit to be in an on state;
- or
- when a voltage of the first input end is less than a voltage of the second input end, the voltage of the first output end controls the switch resistance unit to be in an off state;
- wherein the reverse current switch further comprises:
- a voltage controlled unit comprising a voltage controlled resistance unit and a voltage controlled voltage generation unit, wherein the voltage controlled resistance unit and the switch resistance unit are connected in series between the first input end and the second input end, the voltage controlled voltage generation unit is connected in parallel with the comparison unit, and voltage controlled voltage generation unit comprises a second output end,
- wherein when a difference between the voltage of the first input end and the voltage of the second input end increases, a voltage of the second output end controls a resistance value of the voltage controlled resistance unit to decrease.
7 more elements
A reverse current switch, comprising:
- a comparison unit comprising a first input end, a second input end, and a first output end;
- and
- a switch resistance unit, wherein a first end of the switch resistance unit is connected to the first input end, a second end of the switch resistance unit is connected to the second input end, and a third end of the switch resistance unit is connected to the first output end,
- wherein the switch resistance unit is controlled by a voltage of the first output end;
- when a voltage of the first input end is greater than a voltage of the second input end, the voltage of the first output end controls the switch resistance unit to be in an on state;
- or
- when a voltage of the first input end is less than a voltage of the second input end, the voltage of the first output end controls the switch resistance unit to be in an off state;
- wherein the reverse current switch further comprises:
- a voltage controlled unit comprising a voltage controlled resistance unit and a voltage controlled voltage generation unit, wherein the voltage controlled resistance unit and the switch resistance unit are connected in series between the first input end and the second input end, the voltage controlled voltage generation unit is connected in parallel with the comparison unit, and voltage controlled voltage generation unit comprises a second output end,
- when a difference between the voltage of the first input end and the voltage of the second input end decreases, a voltage of the second output end controls a resistance value of the voltage controlled resistance unit to increase.
7 more elements
A reverse current switch, comprising:
- a comparison unit comprising a first input end, a second input end, and a first output end;
- and
- a switch resistance unit, wherein a first end of the switch resistance unit is connected to the first input end, a second end of the switch resistance unit is connected to the second input end, and a third end of the switch resistance unit is connected to the first output end,
- wherein the switch resistance unit is controlled by a voltage of the first output end:
- when a voltage of the first input end is greater than a voltage of the second input end, the voltage of the first output end controls the switch resistance unit to be in an on state;
- or
- when a voltage of the first input end is less than a voltage of the second input end, the voltage of the first output end controls the switch resistance unit to be in an off state;
- wherein the comparison unit comprises:
- a first metal-oxide-semiconductor (MOS) transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor, wherein a gate of the first MOS transistor is connected to a gate of the second MOS transistor, a gate of the third MOS transistor is connected to a gate of the fourth MOS transistor and a source of the third MOS transistor is connected to a source of the fourth MOS transistor, a drain of the first MOS transistor is connected to a drain of the third MOS transistor, a drain of the second MOS transistor and a drain of the fourth MOS transistor are respectively connected to the first output end, a source of the first MOS transistor is connected to the first input end, and a source of the second MOS transistor is connected to the second input end.
6 more elements
Dependencies are inferred from the claim text.