SUPPLY CIRCUIT

• US 20100079085A1
• Filed: 03/10/2008
• Published: 04/01/2010
• Est. Priority Date: 03/13/2007
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Van Der Broeck, Heinz Willi, Sauerlaender, Georg, Wendt, Matthias
• Application Number:
  US12/530,551
• Publication Number:
  US 20100079085A1
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: H05B 45/39 Circuits containing inverter bridges
• CPC Class Codes: H05B 45/42 Antiparallel configurations
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

In supply circuits (6) comprising bridge circuits (2) and resonance circuits (3) with primary parts to be coupled to the bridge circuits (2) and secondary parts to be coupled to load circuits (4), the secondary parts are provided with elements (32-34) defining resonance frequencies and resonance impedances, to be able to supply different load circuits (4) and/or different loads (41-42) per load circuit (4) individually. The elements (32-34) may comprise capacitors (34) and inductors (32-33). The resonance frequencies define features of primary signals to be supplied from the bridge circuits (2) to the resonance circuits (3) such as pulse widths of pulses of voltage signals and/or pulse frequencies of the voltage signals. The resonance impedances define features of secondary signals to be supplied from the resonance circuits (3) to the load circuits (4) such as values or average values of current signals.

Claims

1. Supply circuit comprising:

a bridge circuit,

a resonance circuit comprising a first transformer and

a first load circuit comprising at least one light emitting diode,

wherein the first transformer comprises a primary part connectable to the bridge circuit and a secondary part connectable to the first load circuit, the primary part comprising a primary winding of the first transformer and the secondary part comprising a secondary winding of the first transformer and a plurality of elements defining a first resonance frequency and a first resonance impedance.

2. Supply circuit of claim 1, wherein the plurality of elements a capacitor and an inductor comprising the secondary winding and/or a leakage inductance of the first transformer, the first resonance frequency defining a feature of a primary signal to be supplied from the bridge circuit to the resonance circuit and the first resonance impedance defining a feature of a secondary signal to be supplied from the resonance circuit to the load circuit.

3. Supply circuit claim 2, wherein the primary signal is a voltage signal and the feature of the primary signal is a pulse width of a pulse of the voltage signal and/or a pulse frequency of the voltage signal, and wherein the secondary signal is a current signal and the feature of the secondary signal is a value of the current signal and/or an average value of the current signal.

4. Supply circuit of claim 1, the resonance circuit further comprising a second transformer having a primary part connectable to the bridge circuit and a secondary part connectable to a second load circuit, the primary part comprising a primary winding of the second transformer, the further secondary part comprising a secondary winding of the second transformer and further elements (37-38) defining a second resonance frequency and a second resonance impedance.

5. Supply circuit of claim 4, the second resonance frequency being substantially equal to the first resonance frequency and the second resonance impedance being substantially different from the second resonance impedance.

6. Supply circuit of claim 1, further comprising a switch for dimming the light emitting diodes.

7. Supply circuit of claim 6, further comprising a controller for controlling the switch in synchronization with the bridge circuit.

8. Supply circuit of claim 1, further comprising a smoothing capacitor for smoothing an input signal for the light emitting diodes.

9. Supply circuit of claim 1, wherein the first load circuit comprises two anti-parallel groups of light emitting diodes, the supply circuit further comprising decoupling diodes for decoupling the two anti-parallel groups of light emitting diodes from each other.

10. (canceled)