Power converter with reduced power consumption when toggling between sleep and normal modes during device charging

摘要

Electronic devices may have batteries that power internal circuitry. A power converter may connect to an input-output port in an electronic device to deliver power to the electronic device. Battery charging circuitry in the electronic device may be used to charge the battery in an electronic device while power is delivered from the power converter. The power converter may have load detection circuitry. When an output load is present, the power converter operates in an active mode and delivers power to the electronic device. When the output load is not present, the power converter enters a low-power standby mode. The electronic device has switching circuitry that periodically either electrically couples or electrically isolates the input-output port from internal circuitry. When the input-output port is isolated, the power converter senses that no output load is present and enters the standby state to conserve power.

主权项

1. A method of operating an electronic device that receives power from a power converter that operates in a sleep mode and an active mode, comprising:
while the power converter is connected to the electronic device, periodically using circuitry in the electronic device to switch the power converter between the sleep mode and the active mode; wherein the power converter is placed into the sleep mode when the power converter detects that output loading from the electronic device is absent, and the power converter is placed into the active mode when the power converter detects that output loading from the electronic device is present, wherein the electronic device opens a switch in a protection circuit to electrically isolate the power converter from the electronic device so that the power converter detects an absence of output loading and, in response to the detection of the absence of output loading, the power converter enters into the sleep mode, wherein the protection circuit protects the electronic device when a power supply voltage is out of range, and wherein the electronic device closes the switch in the protection circuit to electrically connect the power converter to the electronic device so that the power converter detects a presence of output loading and, in response to the detection of the presence of output loading, the power converter enters into the active mode.