Power receiving apparatus and control circuit thereof
AssigneeRohm Co., Ltd.
InventorsFuminori KOGA, Kenichi MOTOKI
Life of this patent
Estimating the term…
Abstract
A power receiving apparatus receives a bus voltage from a power supply apparatus via a cable, and supplies the bus voltage to a load circuit. A power receiver side controller receives, as a power supply, a voltage VADP, of a bus line that is more toward a bus switch. The power receiver side controller is capable of communicating with a power supply side controller of the power supply apparatus. Furthermore, the power receiver side controller determines the voltage to be supplied based on a negotiation, and controls the bus switch. A short circuit detection circuit detects a short circuit of a bus line that is more toward the load circuit side than the bus switch.
Claims20
A power receiving apparatus structured to receive a bus voltage from a power supply apparatus via a cable, and to supply the bus voltage to a load circuit, the power receiving apparatus comprising:
- a bus line structured to extend from a receptacle, into which the cable is to be inserted, to the load circuit;
- a bus switch arranged on a path of the bus line;
- a power receiver side controller structured to receive, as a power supply, a voltage on the bus line that is more toward the receptacle side than the bus switch, to communicate with a power supply side controller of the power supply apparatus, to determine a voltage to be supplied based on a negotiation, and to control the bus switch;
- and
- a short circuit detection circuit structured to detect a short circuit of the bus line that is more toward the load circuit side than the bus switch in an off state of the bus switch.
A control circuit structured to be employed in a power receiving apparatus structured to receive a bus voltage from a power supply apparatus via a cable, and to supply the bus voltage to a load circuit, wherein, in addition to the control circuit, the power receiving apparatus comprises:
- a bus line structured to extend from a receptacle, into which the cable is to be inserted, to the load circuit;
- and
- a bus switch arranged on a path of the bus line,
- and wherein the control circuit comprises:
- a communication circuit structured to communicate with a power supply side controller of the power supply apparatus;
- a logic circuit structured to determine a voltage to be supplied, based on a negotiation with the power supply side controller, and to control the bus switch;
- and
- a short circuit detection circuit structured to detect a short circuit of the bus line that is more toward the load circuit side than the bus switch in a state in which the logic circuit turns off the bus switch.
An operating method for a power supply system that is compatible with the USB-PD specification, wherein the power supply system comprises a power supply apparatus and a power receiving apparatus,
- wherein the power supply apparatus comprises:
- a bus line structured to extend from a receptacle, into which the cable is to be inserted, to a load circuit;
- and
- a bus switch arranged on a path of the bus line, and wherein the operating method comprises:
- determining a bus voltage based on a negotiation between the power supply apparatus and the power receiving apparatus;
- supplying, by means of the power supply apparatus, the bus voltage thus determined based on the negotiation to the power receiving apparatus;
- transmitting, by means of the power supply apparatus, a notice of the supplying of the bus voltage;
- detecting, by means of the power receiving apparatus, a short circuit on a side that is more toward the load circuit side than the bus switch in response to the notice before the bus switch is turned on;
- and
- turning on the bus switch under a condition of non-detection of a short circuit.
Dependencies are inferred from the claim text.