Circuitry for supplying electrical power to loads
View Patent ↗A power supply, comprising a boost converter which provides voltage to a first load, and a flyback converter which provides voltage to a second load and which utilizes an inductive element of the boost converter as a primary winding of a transformer of the flyback converter. Also, a power supply comprising a MOSFET which is disposed between solid state elements and a second reference potential and which controls current flowing through the solid state elements. Also, a circuit comprising a transformer, a first circuit portion comprising the primary winding of the transformer and a second circuit portion comprising the secondary winding of the transformer. Also, a power supply comprising means for using a common transformer for providing a boost converter and a flyback converter. Also, a power supply comprising a transformer, means for providing a boost converter utilizing the transformer, and means for providing a flyback converter utilizing the transformer.
1. A power supply, comprising:
a boost converter configured to provide a voltage higher than an input voltage to a first load; and
a flyback converter configured to provide a voltage to a second load, the flyback converter utilizing an inductive element of the boost converter as a primary winding of a transformer of the flyback converter
the inductive element of the boost converter coupled to the input voltage, the flyback converter comprising:
a secondary winding configured to be coupled to the primary winding;
a second diode coupled between the secondary winding and a second string of light emitting elements;
a sub-circuit connected in series with the second diode, the sub-circuit comprising a first capacitive element and the second string of light emitting elements in parallel; and
a second capacitive element connected in series with the second diode and the sub-circuit.
2. The power supply of claim 1 , wherein the boost converter further comprises:
a first diode coupled between the inductive element and a first string of light emitting elements; and
a switching element coupled between the inductive element and a reference voltage.
3. The power supply of claim 2 , further comprising a control circuit configured to control the switching element to provide a predefined frequency and duty cycle with which the switching element is opened and closed.
4. The power supply of claim 1 , wherein at least one of said first load and said second load comprises a string of light emitting elements.
5. The power supply of claim 4 , wherein at least one of said light emitting elements comprises a solid state light emitter.
6. The power supply of claim 1 , wherein said first load and said second load each comprise a string of light emitting elements.
7. A circuit for supplying power, comprising:
at least a first transformer, the first transformer comprising a primary winding and a secondary winding;
a first circuit portion; and
a second circuit portion,
the first circuit portion comprising the primary winding of the first transformer, at least a first switch and a first sub-circuit, the first switch and the first sub-circuit arranged in parallel,
the first sub-circuit comprising at least a first diode and a second sub-circuit, the first diode and the second sub-circuit arranged in series,
the second sub-circuit comprising at least a first capacitor and at least a first load arranged in parallel,
the second circuit portion comprising the secondary winding of the first transformer, at least a second diode, a third sub-circuit and a third capacitor, the second diode and the third sub-circuit arranged in series,
the third sub-circuit comprising at least a second capacitor and at least a second load arranged in parallel,
the third capacitor electrically connected between a cathode end of the third sub-circuit and the secondary winding of the first transformer.
8. The circuit of claim 7 , wherein the second sub-circuit is electrically connected to a cathode end of the first diode.
9. The circuit of claim 7 , wherein the third sub-circuit is electrically connected to a cathode end of the second diode.
10. The circuit of claim 7 , wherein the first switch is a MOSFET.
11. The circuit of claim 10 , wherein the MOSFET is configured to control the level of current flowing through at least a first string of light emitting elements.
12. The circuit of claim 7 , wherein voltage applied to the first load is based on a duty cycle of the first switch.
13. The circuit of claim 7 , wherein at least one of the first load and the second load comprises at least a first solid state light emitting element.
14. The circuit of claim 13 , wherein the first solid state light emitting element is an LED.
15. The circuit of claim 7 , wherein a first voltage supplied to the first load differs from a second voltage supplied to the second load.
16. The circuit of claim 15 , wherein the first voltage is applied to the first load during at least a portion of a time that the second voltage is applied to the second load.
17. A circuit for supplying power, comprising:
at least a first transformer, the first transformer comprising a primary winding and a secondary winding;
a first circuit portion; and
a second circuit portion,
the first circuit portion comprising the primary winding of the first transformer, at least a first switch and a first sub-circuit, the first switch and the first sub-circuit arranged in parallel,
the first sub-circuit comprising at least a first diode and a second sub-circuit, the first diode and the second sub-circuit arranged in series,
the second sub-circuit comprising at least a first capacitor and at least a first load arranged in parallel,
the second circuit portion comprising the secondary winding of the first transformer, at least a second diode, a third sub-circuit and a third diode, the second diode and the third sub-circuit arranged in series,
the third sub-circuit comprising at least a second capacitor and at least a second load arranged in parallel,
the third diode electrically connected between a first node and a second node, the first node between a first end of the secondary winding of the first transformer and the anode end of the second diode, the second node between the cathode end of the third sub-circuit and a second end of the secondary winding of the first transformer.
18. The circuit of claim 17 , wherein the third capacitor electrically connected between the second end of the secondary winding of the first transformer and a node which is electrically connected to a cathode end of the third sub-circuit and to a cathode end of the third diode.
19. A circuit for supplying power, comprising:
at least a first transformer, the first transformer comprising a primary winding and a secondary winding;
a first circuit portion; and
a second circuit portion,
the first circuit portion comprising the primary winding of the first transformer, at least a first switch and a first sub-circuit, the first switch and the first sub-circuit arranged in parallel,
the first sub-circuit comprising at least a first diode and a second sub-circuit, the first diode and the second sub-circuit arranged in series,
the second sub-circuit comprising at least a first capacitor and at least a first load arranged in parallel,
the second circuit portion comprising the secondary winding of the first transformer, at least a second diode and a third sub-circuit, the second diode and the third sub-circuit arranged in series,
the third sub-circuit comprising at least a second capacitor and at least a second load arranged in parallel,
wherein:
at least one of the first load and the second load comprises at least a first solid state light emitting element, at least a first transistor, at least a first resistor and at least a first operational amplifier,
the first solid state light emitting element, the first transistor, and the first resistor arc arranged in series,
a cathode end of the first solid state light emitting element is electrically connected to a source of the first transistor,
the first resistor is electrically connected to a collector of the first transistor, and
the operational amplifier drives a gate voltage of the first transistor, a reference voltage is provided as a first input to the operation amplifier and a voltage from a node between the collector of the first transistor and the first resistor is a second input to the operational amplifier.