INDUCTION CHARGING DEVICE

• US 20150002087A1
• Filed: 06/27/2014
• Published: 01/01/2015
• Est. Priority Date: 06/28/2013
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: MACK, Juergen
• Application Number:
  US14/318,312
• Publication Number:
  US 20150002087A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

An induction charging device has: at least one charging electronics unit which includes at least one frequency unit situated between at least two DC voltage paths; at least one charging coil connected to a voltage tap of the at least one frequency unit; and at least one control unit provided to operate the at least one frequency unit at one frequency in at least one first operating state. The at least one control unit controls a power output via a pulse width modulation of a pulse duration of the first operating state relative to an operating period.

Claims

1. An induction charging device, comprising:

at least one charging electronics unit including;

at least one frequency unit situated between at least two DC voltage paths;

at least one charging coil connected to a voltage tap of the at least one frequency unit; and

at least one control unit configured to operate the at least one frequency unit at one frequency in at least one first operating state, wherein the at least one control unit controls a power output via a pulse width modulation of a pulse duration of the first operating state relative to an operating period.

2. The induction charging device as recited in claim 1, wherein the at least one control unit controls a power output via a pulse width modulation of a pulse duration of the first operating state relative to a constant operating period.

3. The induction charging device as recited in claim 2, wherein the operating period includes the pulse-forming, first operating state and one second operating state formed from a zero voltage operating state.

4. The induction charging device as recited in claim 3, wherein a period duration of the operating period is at least 1 ms.

5. The induction charging device as recited in claim 3, wherein a minimum pulse duration of the pulse width modulation of the control unit is below a value of a transient duration.

6. The induction charging device as recited in claim 3, wherein the at least one frequency unit forms at least a part of a half bridge.

7. The induction charging device as recited in claim 3, wherein the at least one frequency unit includes at least two semiconductor switches.

8. The induction charging device as recited in claim 3, wherein the at least one control unit includes at least one interface configured to receive during a charging operation information regarding at least one of a charge state and a power requirement of an object to be charged.

9. The induction charging device as recited in claim 3, wherein the at least one control unit adapts a duty cycle of the pulse width modulation to at least one of a charge state and a power requirement of an object to be charged.

10. A method for controlling a power output of an induction charging device having at least one frequency unit situated between at least two DC voltage paths, at least one charging coil connected to a voltage tap of the at least one frequency unit, and at least one control unit, the method comprising:

operating, by the at least one control unit, the at least one frequency unit at one frequency in at least one first operating state, wherein the at least one control unit controls a power output via a pulse width modulation of a pulse duration of the first operating state relative to an operating period.