System for capacitively driving a load

• US 9,748,801 B2
• Filed: 10/09/2014
• Issued: 08/29/2017
• Est. Priority Date: 10/09/2013
• Status: Expired due to Fees

• Current Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Original Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Inventors: Sempel, Adrianus, Van Den Biggelaar, Theodorus Johannes Petrus
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): Kaiser, Syed M
• Application Number:
  US15/027,693
• Publication Number:
  US 20160248274A1
• Time in Patent Office: 1,055 Days
• Field of Search: 315185 R, 307109
• CPC Class Codes: H02J 50/05 using capacitive coupling
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices

Abstract

A capacitive driving system (100) comprises:

• • a supply device (10) comprising a power generator (13), capacitive transmission electrodes (11, 12) and preferably at least one inductor (16) connected in series between the power generator and at least one of said transmission electrodes;
  • at least one load device (20) comprising two capacitive receiver electrodes (21, 22) and at least one load member (23) coupled to said receiver electrodes.
    For resonant energy transfer, the supply device and the load device have an energy transfer position in which a first one of said transmission electrodes together with a first one of said receiver electrodes defines a first transfer capacitor (31) while simultaneously a second one of said transmission electrodes together with a second one of said receiver electrodes defines a second transfer capacitor (32). At least one auxiliary capacitor (111; 112; 121; 122) is connected in series with inductor and load.

Claims

1. Capacitive driving system, comprising:

a supply device, the supply device comprising a power generator having two output terminals, at least one set of capacitive transmission electrodes coupled to respective ones of the output terminals;

at least one load device comprising two capacitive receiver electrodes and at least one load member coupled to said receiver electrodes;

wherein at least one of the supply device and the at least one load device comprise at least one inductor connected in series with at least one of said respective electrodes;

wherein the supply device and the load device have an energy transfer position in which a first one of said transmission electrodes together with a first one of said receiver electrodes defines a first transfer capacitor while simultaneously a second one of said transmission electrodes together with a second one of said receiver electrodes defines a second transfer capacitor;

wherein, in the energy transfer position, resonant energy transfer takes place from the supply device to the at least one load member;

wherein, in a resonant circuit includes the at least one inductor and the at least one load member in the energy transfer position, at least one auxiliary capacitor is connected in series with the at least one inductor and the at least one load member;

wherein the capacitance value of each one of said transfer capacitors is in a range from (1−

Δ

1)·

C1 to (1+Δ

1)·

C1, in which C1 is indicated as design capacitance of the first and second transfer capacitors and in which Δ

1 is indicated as variation of the first and second transfer capacitors;

wherein the capacitance value of the auxiliary capacitor is in a range from (1−

Δ

a)·

Ca to (1+Δ

a)·

Ca, in which Ca is indicated as design capacitance of the auxiliary capacitor and in which Δ

a is indicated as variation of the auxiliary capacitor;

and wherein Ca<

C1 applies and wherein Δ

a<

Δ

1 applies.

2. Capacitive driving system according to claim 1, wherein the supply device comprises at least one inductor connected in series between the power generator and at least one of said transmission electrodes.

3. Capacitive supply device adapted for a capacitive driving system according to claim 1, comprising the power generator having two output terminals, the at least one set of capacitive transmission electrodes coupled to respective ones of the output terminals and the at least one auxiliary capacitor connected in series with at least one of said transmission electrodes;

said transmission electrodes designed and suited for capacitive coupling with two capacitive receiver electrodes of the load device adapted for the capacitive driving system, the coupled transmission and receiver electrodes defining transfer capacitors;

the supply device preferably further comprising the at least one inductor connected in series between the power generator and at least one of said transmission electrodes;

wherein the capacitance value of each one of said transfer capacitors is in the range from (1−

Δ

1)·

C1 to (1+Δ

1)·

C1, in which C1 is indicated as design capacitance of the transfer capacitors and in which Δ

1 is indicated as variation of the first and second transfer capacitors;

wherein the capacitance value of the auxiliary capacitor is in a range from (1−

Δ

a)·

Ca to (1+Δ

a)·

Ca, in which Ca is indicated as design capacitance of the auxiliary capacitor and in which Δ

a is indicated as variation of the auxiliary capacitor;

and wherein Ca<

C1 applies and wherein Δ

a<

Δ

1 applies.

4. Capacitive supply device according to claim 3, comprising an additional set of capacitive transmission electrodes coupled to said output terminals, further comprising respective auxiliary capacitors connected in series with the respective transmission electrodes.

5. Capacitive supply device according to claim 1,

wherein the at least one set of capacitive transmission electrodes are at least two relatively large-surface capacitive transmission electrodes coupled to said output terminals designed and suited for capacitive coupling with capacitive receiver electrodes of a plurality of load devices that further each comprise at least one load member coupled to said receiver electrodes;

the supply device further comprising at least one auxiliary capacitor connected in series with a respective transmission electrode.

6. Capacitive load device adapted for the capacitive driving system according to claim 1, comprising the two capacitive receiver electrodes, the at least one load member coupled to said receiver electrodes and the at least one auxiliary capacitor connected in series with the load member and/or connected in series with at least one of said receiver electrodes;

wherein said receiver electrodes are designed and suited for capacitive coupling with two capacitive transmission electrodes of a supply device adapted for the capacitive driving system, the coupled transmission and receiver electrodes defining transfer capacitors, and preferably at least one inductor connected in series between the power generator and at least one of said transmission electrodes;

wherein the capacitance value of each one of said transfer capacitors is in a range from (1−

Δ

1)·

C1 to (1+Δ

1)·

C1, in which C1 is indicated as design capacitance of the transfer capacitors and in which Δ

1 is indicated as variation of the transfer capacitors;

wherein the capacitance value of the auxiliary capacitor is in a range from (1−

Δ

a)·

Ca to (1+Δ

a)·

Ca, in which Ca is indicated as design capacitance of the auxiliary capacitor and in which Δ

a is indicated as variation of the auxiliary capacitor and wherein Ca<

C1 applies and wherein Δ

a<

Δ

1 applies.

7. Capacitive load device according to claim 6, comprising two auxiliary capacitors connected in series at opposite ends of the load member.

8. Capacitive load device according to claim 6, comprising a parallel arrangement of at least two load members and one common auxiliary capacitor connected in series with said parallel arrangement.

9. Capacitive load device according to claim 6, comprising a parallel arrangement of at least two load members and two auxiliary capacitor connected in series at opposite ends of said parallel arrangement.

10. Capacitive load device according to claim 6, comprising a parallel arrangement of at least two load members and respective individual auxiliary capacitor connected in series with respective ones of said load members.

11. Capacitive load device according to claim 8, wherein the load device is an illumination load device and at least one of said two load members comprises a string of at least one first LED, while the other one of said two load members is at least electrically conductive in the opposite direction as compared to the forward direction of said at least one first LED, said other one of said two load members preferably comprising a string of at least one LED arranged anti-parallel to said at least one first LED.

12. Semiconductor building component adapted for a capacitive driving system according to claim 1, comprising a common semiconductor substrate, at least one anti -parallel arrangement of strings of one or more LEDs formed in said semiconductor substrate, and the at least one auxiliary capacitor formed in said semiconductor substrate and connected in series with said anti-parallel arrangement of LEDs, or connected in series with respective ones of said LED strings.