Wireless power transmission system with increased output voltage

• US 6,664,770 B1
• Filed: 10/10/2001
• Issued: 12/16/2003
• Est. Priority Date: 12/05/1999
• Status: Expired due to Fees

• Current Assignee: IQ mobil Electronics GmbH
• Original Assignee: IQ-Mobil GmbH
• Inventors: Bartels, Oliver
• Primary Examiner(s): Berhane, Adolf D.
• Assistant Examiner(s): Laxton, Gary L.
• Application Number:
  US09/890,794
• Time in Patent Office: 797 Days
• Field of Search: 323/222, 323/223, 323/299, 323/349, 323/351, 455/41, 455/393, 455/571, 455/572, 340/827.72, 379/55.1
• US Class Current: 323/222
• CPC Class Codes: B60C 23/0413 Wireless charging of active radio frequency circuits
• CPC Class Codes: G06K 19/0713 the arrangement including a power charge pump
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 7/217 using semiconductor devices only

Abstract

The invention relates to a system for wireless power transmission, which makes it possible to generate an increased voltage on the receiver side using a radio signal that is optimized for this purpose and thereby permits operation particularly of digital semiconductor components in the receiver even if the receiver does not have a power supply of its own.

Claims

1. A device for wireless power transmission, including a system for supplying transponders, comprising:

at least one high-frequency transmitter that transmits a transmitted high-frequency output signal, and

at least one high-frequency receiver that receives the transmitted high-frequency output signal,

wherein the at least one high-frequency transmitter is connected to at least one antenna, and the at least one high-frequency receiver is connected to at least one antenna,

wherein the receiver obtains its operating power from the transmitted high-frequency output signal from said transmitter,

wherein (1) the transmitted high-frequency output signal from the transmitter is modulated with at least one converter clock suitable for a DC-DC converter, (2) the receiver has at least one detector for demodulating the at least one converter clock from the transmitted high frequency output signal, (3),the receiver generates a DC operating voltage for the DC-DC converter from the high-frequency output signal using at least one of a rectifier and the at least one detector, (4) the DC-DC converter, using the at least one converter clock, and generating another DC voltage to operate further circuit elements.

2. The device as claimed in claim 1, wherein the high frequency transmitter is pulse modulated or amplitude modulated.

3. The device as claimed in claim 1, wherein a DC operating voltage for the DC-DC converter is derived from a common rectifier and detector together with the converter clock, in that a common output signal is processed by means of at least one of a low-pass filter and at least one diode coupling and a buffer capacitor.

4. The device as claimed in claim 1, wherein the at least one converter clock for the DC-DC converter is derived from a common rectifier and detector together with a DC operating voltage for the DC-DC converter, in that a common output signal is processed by means of at least one of a high-pass filter and at least one band pas filter.

5. The device as claimed in claim 1, wherein a voltage level of the at least one converter clock is increase by impedance conversion by means of one of a transmitter and resonant circuit.

8. The device as claimed in claim 1, wherein after initially generating an increased DC voltage to start up the circuit elements, converter clock generation is taken over locally in the receiver using the started circuit elements, including by one of local oscillators and by derivation from digitally encoded information of the transmitted signal, which makes it possible to use the radio frequency for data transmission purposes and further allows local load-dependent control of converter output voltage.

9. The device as claimed in claim 8, further comprising a reverse channel that communicates to the transmitter when the converter clock generation has been taken over in the receiver, which causes the transmitter to switch to a different operating state so that one of pulse modulation and amplitude modulation is replaced by one of a continuous transmitted signal (continuous wave) and a transmitted signal with a different pulse duty ratio.

10. The device as claimed in claim 1, further comprising specifically controlled semiconductor elements that cause impedance changes on at least one of an antenna of the receiver and at least one rectifier and detector of the receiver, which are used for feedback of digital information from the receiver to the transmitter, which is equipped with additional receiving components by changing a reflection and absorption behavior of a receiving antenna (backscatter modulation).

6. A device for wireless power transmission, including a system for supplying transponders, comprising:

at least one high-frequency transmitter that transmits a transmitted high-frequency output signal, and

at least one high-frequency receiver that receives the transmitted high-frequency output signal,

wherein the at least one high-frequency transmitter is connected to at least one antenna, and the at least one high frequency receiver is connected to at least one antenna,

wherein the receiver obtains its operating power from the transmitted high-frequency output signal from said transmitter,

wherein (1) the transmitted high-frequency output signal from the transmitter is modulated with at least one converter clock suitable for a DC-DC converter, (2) the receiver has at least one detector for demodulating the at least one converter clock from the transmitted high frequency output signal, (3) the receiver generates a DC operating voltage for the DC-DC converter from the high-frequency output signal using at least one of a rectifier and the at least one detector, (4) the DC-DC converter, using the at least one converter clock, and generating another DC voltage to operate further circuit elements,

wherein one of an inductive switching controller and an inductive switching converter is used as the DC-DC converter, which by means of at least one electronic switch controlled by the converter clock, including a transistor, allows a switched current to flow through at least one inductance and thereby generate a high voltage at the at least one inductance during a disabling process, wherein the high voltage can be picked off directly using a fast switching diode, or decoupled via an additional inductance.

7. The device as claimed in claim 6, wherein a feedback pulse is generated at the inductance at the DC-DC converter to an input of the DC-DC converter.