Sleep-wake control circuit for battery powered electronic device

Patent metadata

Field	Value
Publication number	US-11093018-B2
Application number	US-201916524461-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Jul 29, 2019
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A sleep-wake control circuit using a D-type flip-flop with a Schmitt trigger to detect pulse wake-up signal transitions. The sleep-wake control circuit comprises a sleep command input channel, a wake command input channel, and a D-type flip-flop. The D-type flip-flop is configured to receive a signal to switch to sleep mode from the sleep command input channel as a clock signal and to receive a wake event signal to switch to wake mode from the wake command input channel as a clear signal, such that a wake event signal from the wake command input channel takes priority over a sleep event signal from the sleep command input channel. The sleep command input channel and the wake command input channel are configured to include Schmitt triggers so as to detect pulse input signals.

First claim

What is claimed is:

1. A vehicle comprising:
a flyback converter electrically connected to an electronic vehicle device;
a controller electrically connected to said flyback converter;
a sleep-wake control circuit for controlling the state of the flyback converter via the controller, wherein the sleep-wake control circuit includes a sleep command input, a wake command input, and a D flip-flop configured to maintain either a sleep mode or a wake mode;
wherein the D flip-flop is configured to receive a sleep event signal to switch to sleep mode from the sleep command input as a clock signal via a clock input pin, wherein the sleep event signal is fed through a first Schmitt trigger before being received by the clock input pin;
wherein the D flip-flop is configured to receive a wake event signal to switch to wake mode from the wake command input as a clear signal via a clear input pin, wherein the wake event signal is fed through a second Schmitt trigger before being received by the clear input pin;
said D flip-flop includes an output electrically connected to the controller via an enable/undervoltage lockout input pin such that when the output of the D flip-flop is set to logic low corresponding with the sleep mode, the controller is disabled and the flyback converter operates in the sleep mode, and when the output of the D flop-flop is set to logic high corresponding with wake mode, the controller is enabled and the flyback converter operates in the wake mode.

Assignees

• Karma Automotive Llc

Inventors

• Yu Xiaohang
• Niu Geng

Classifications

• G07C5/08

  Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time · CPC title

• G06F1/3243 Primary

  Power saving in microcontroller unit · CPC title

• B60L1/00 Primary

  Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) · CPC title

• B60R16/033

  characterised by the use of electrical cells or batteries (for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36) · CPC title

• G06F1/3203

  Power management, i.e. event-based initiation of a power-saving mode · CPC title