Control pilot wake-up circuit for on-board charger

Patent metadata

Field	Value
Publication number	US-11368035-B2
Application number	US-202016832501-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 27, 2020
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

An on-board charger (OBC) for an electric vehicle includes a charge unit, a controller, and a control pilot (CP) wake-up circuit. The charge unit is operable for receiving energy from an EVSE for charging a traction battery of the vehicle. The controller while awake can control the charge unit to charge the battery with energy from the EVSE. The CP wake-up circuit receives a control pilot (CP) signal from the EVSE, detects for a change in a current state of the CP signal while the controller is asleep, and generates a wake-up signal for waking up the controller in response to the current state of the CP signal changing to a new state. The CP wake-up circuit includes first/second detector circuits usable for detecting for a change in the current state of the CP signal to a first/second new state.

First claim

What is claimed is:

1. An on-board charger for an electric vehicle, comprising:
a charge unit operable for receiving energy from an EVSE for charging a traction battery of the electric vehicle;
a controller operable to be in a sleep mode or in an awake mode, the controller in the awake mode configured to control the charge unit to charge the traction battery with energy from the EVSE; and
a control pilot wake-up circuit configured to receive a control pilot signal from the EVSE, detect for a change in a current state of the control pilot signal while the controller is in the sleep mode, and generate a wake-up signal for waking up the controller in response to the current state of the control pilot signal changing to a new state;
wherein the control pilot wake-up circuit includes:
a first control pilot state change detector circuit usable for detecting for a change in the current state of the control pilot signal to a first new state,
a second control pilot state change detector circuit usable for detecting for a change in the current state of the control pilot signal to a second new state, and
a contact monitoring circuit common to the first and second control pilot state change detector circuits,
wherein the first and second control pilot state change detector circuits have a same kind of electronic components,
the electronic components of the first control pilot state change detector circuit include a first capacitor,
the contact monitoring circuit is operable to periodically inject a current pulse to the first capacitor for charging the first capacitor, wherein the electronic components of the first control pilot state change detector circuit are arranged such that the first capacitor discharges after receiving the current pulse while the current state of the control pilot signal remains unchanged and charges to have a voltage greater than a threshold upon receiving one or more of the current pulses after the current state of the control pilot signal has changed from the current state to the first new state, and
the contact monitoring circuit is further operable to generate the wake-up signal for waking up the controller in response to the voltage of the first capacitor becoming greater than the threshold due to the current state of the control pilot signal changing to the first new state.

2. The on-board charger of claim 1 wherein:
the charge unit includes at least one of (i) a power plant operable for converting energy received from the EVSE into a usable form for charging the traction battery and (ii) a relay operable for transferring energy received from the EVSE directly to the traction battery.

3. The on-board charger of claim 1 wherein:
the electronic components of the second control pilot state change detector circuit include a second capacitor;
the contact monitoring circuit is operable to periodically inject a current pulse to the second capacitor for charging the second capacitor, wherein the electronic components of the second control pilot state change detector circuit are arranged such that the second capacitor discharges after receiving the current pulse while the current state of the control pilot signal remains unchanged and charges to have a voltage greater than the threshold upon receiving one or more of the current pulses after the current state of the control pilot signal has changed from the current state to the second new state; and
the contact monitoring circuit is further operable to generate the wake-up signal for waking up the controller in response to the voltage of the second capacitor becoming greater than the threshold due to the current state of the control pilot signal changing to the second new state.

4. The on-board charger of claim 1 wherein:
the first control pilot state change detector circuit and the second control pilot state change detector circuit are both usable for detecting for a change in the current state of the control pilot signal to a third new state.

5. An on-board charger for an electric vehicle, comprising:
a charge unit operable for receiving energy from an EVSE for charging a traction battery of the electric vehicle;
a controller operable to be in a sleep mode or in an awake mode, the controller in the awake mode configured to control the charge unit to charge the traction battery with energy from the EVSE; and
a control pilot wake-up circuit configured to receive a control pilot signal from the EVSE, detect for a change in a current state of the control pilot signal while the controller is in the sleep mode, and generate a wake-up signal for waking up the controller in response to the current state of the control pilot signal changing to a new state;
wherein states of the control pilot signal include a state A in which a voltage of the control pilot signal is zero volts, a state B1 in which the voltage of the control pilot signal is a constant, positive, non-zero value of volts, and a state B2 in which the voltage of the control pilot signal is an alternating, non-zero value of volts, wherein:
the control pilot wake-up circuit includes a first control pilot state change detector circuit and a second control pilot state change detector circuit usable, wherein the first and second control pilot state change detector circuits have a same kind of electronic components;
wherein when the current state of the control pilot signal is either the state B1 or the state B2, the first control pilot state change detector circuit is used for detecting for a change in state of the control pilot signal from either the state B1 to the state B2 or the state B2 to the state B 1 ; and
wherein when the current state of the control pilot signal is either the state A or the state B2, the second control pilot state change detector circuit is used for detecting for a change in state of the control pilot signal from either the state A to the state B2 or the state B2 to the state A.

6. The on-board charger of claim 5 wherein:
when the current state of the control pilot signal is either the state A or the state B1, either of the first control pilot state change detector circuit or the second control pilot state change detector circuit is used for detecting for a change in state of the control pilot signal from either the state A to the state B1 or the state B1 to the state A.

7. An on-board charger for an electric vehicle, comprising:
a charge unit operable for receiving energy from an EVSE for charging a traction battery of the electric vehicle;
a controller operable to be in a sleep mode or in an awake mode, the controller in the awake mode configured to control the charge unit to charge the traction battery with energy from the EVSE; and
a control pilot wake-up circuit configured to receive a control pilot signal from the EVSE, detect for a change in a current state of the control pilot signal while the controller is in the sleep mode, and generate a wake-up signal for waking up the controller in response to the current state of the control pilot signal changing to a new state;
wherein states of the control pilot signal include a state A indicative of a cordset of the EVSE being disconnected from the on-board charger, a state B1 indicative of the cordset of the EVSE being connected to the on-board charger but the EVSE not being ready to charge, and a state B2 indicative of the cordset of the EVSE being connected to the on-board charger and the EVSE being ready to charge, wherein:
the control pilot wake-up circuit includes a first control pilot state change detector circuit and a second control pilot state change detector circuit usable, wherein the first and second control pilot state change detector circuits have a same kind of electronic components; and
wherein when the current state of the control pilot sign

Assignees

• Lear Corp

Inventors

• Marcos Pastor Adria
• Martinez Ramirez Alberto
• Amenos Murtra Antoni
• Zahino Andres Edgar

Classifications

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/927 Primary

  with introduction of pulses during the charging process · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/40

  characterised by the exchange of charge or discharge related data · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title