US 2019/0058463 A1Published application

Reverse current protection circuit

AssigneeTexas Instruments Incorporated

InventorsSujan Kundapur Manohar, Roland Karl Son, Juergen Luebbe, Eddie W. Yu

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Abstract

In described examples, a power interface subsystem includes power transistors, each having: a conduction path coupled between a battery terminal and an accessory terminal; and a control terminal. A differential amplifier has: a first input coupled to the battery terminal; a second input coupled to the accessory terminal; and an output node. An offset voltage source is coupled to cause an offset of a selected polarity at one of the inputs to the differential amplifier. The offset has a first polarity in a first operating mode and a second polarity in a second operating mode. Gate control circuitry is coupled to apply a control level at the control terminal(s) of selected one(s) of the power transistors responsive to a voltage at the output node, and to apply an off-state control level to the control terminal(s) of unselected one(s) of the power transistors.

Claims19

Dependent claims

A power interface subsystem for a battery-powered electronic system, comprising:

a power transistor having:
a source/drain path coupled between a battery terminal and an accessory terminal;
and a gate;
and
a reverse current protection circuit including:
an input differential amplifier stage, including first and second input legs, the first leg coupled to the battery terminal, the second leg coupled to the accessory terminal, the first leg including first and second transistors with their source/drain paths connected in series, the second leg including third and fourth transistors with their source/drain paths connected in series, and the first and third transistors having gates connected together at the drain of the second transistor;
first and second load devices coupled to the first and second input legs, respectively;
an offset voltage source, coupled to the input differential amplifier stage to cause an offset of a selected polarity between the first and second input legs;
a replica bias leg including:
a replica load device;
and first and second replica transistors having their source/drain paths connected in series between the battery terminal and the replica load device, the drain of the second replica transistor connected to gates of the first and second replica transistors and to gates of the second and fourth transistors;
and
gate control circuitry coupled to apply a gate voltage to the power transistor responsive to a voltage at an output node at the second load device.

10 more elements

A power interface subsystem for a battery-powered electronic system, comprising:

a power transistor having:
a conduction path coupled between a battery terminal and an accessory terminal;
and a control terminal;
and
a reverse current protection circuit including:
a differential amplifier having:
a first input coupled to the battery terminal;
a second input coupled to the accessory terminal;
and an output node;
an offset voltage source coupled to cause an offset of a selected polarity at inputs to the differential amplifier, the offset having a first polarity in a first operating mode and a second polarity in a second operating mode;
gate control circuitry coupled to apply a control level at the control terminal of the power transistor responsive to a voltage at the output node;
an output diode connected at the output node;
and
an output mode transistor having:
a conduction path connected between the output diode and a reference voltage;
and a control terminal coupled to turn the output mode transistor on in the first operating mode and off in the second operating mode.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/167,151Filed 22 Oct 2018
Priority: 10 Aug 2015
Published: 21 Feb 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H03K 5/08
Shaping pulses: by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
H02H 3/18
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working…:…
H03K 17/08122
By measures taken in the control circuit: in field-effect transistor switches
H02H 3/08
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working…:…

Family

Application62/203,288Us provisional application · filed 10 Aug 2015
Application15/232,521Continuation · filed 9 Aug 2016
Application16/167,151Continuation
US 10,116,291 B2Related patent
US 10,979,037 B2Related patent
US 2017/0047731 A1Published application
US 2019/0058463 A1This patent

From the US filing history. Foreign family members aren’t listed.