# US 2017/0286336 A1 · Direct drive led driver and offline charge pump and method therefor

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- Number: US 2017/0286336 A1
- Document ID: US20170286336A1
- Status: Published application
- Kind: A1
- Application number: 15/582,127
- Filed: 2017-04-28
- Published: 2017-10-05
- Earliest claimed: 2012-06-28
- Inventors: DAVID SCHIE; MIKE WARD
- Web page: https://patentgrep.com/patent/US20170286336A1

## CPC

- G06F 13/28: using burst mode transfer, e.g. direct memory access {DMA}, cycle steal (G06F13/32 takes precedence)
- H05B 45/37: Converter circuits
- G06F 13/4009: {with data restructuring}
- H02M 3/07: using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps}
- H05B 33/00: Electroluminescent light sources
- H03K 19/177: arranged in matrix form
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

In one embodiment, a Light Emitting Diode (LED) driving device for driving a plurality of LEDs has a switching matrix utilizing a plurality of one of a turn off thyristors or turn off triacs coupled to the plurality of LEDs. A controller is coupled to the switching matrix responsive to a voltage of a rectified AC halfwave, wherein combinations of the plurality of LEDs are altered to ensure a maximum operating voltage of the plurality of LEDs is not exceeded. A current limiting device is coupled to the combinations of the plurality of LED to regulate current. In a second embodiment an offline charge pump utilizes a switching matrix to recombine capacitors in accordance with the voltage on the AC half wave and then in accordance with a desired output voltage to feed a load, such that said recombinations occur at a frequency much higher than the frequency of the AC rectified half wave such that charge is “pumped” from the input at one voltage to the output at another voltage through the AC halfwave while providing a constant output voltage to the load.

## Claims

### Claim at position 1

1-29. (canceled)

### Claim 30

An offline charge pump device comprising:
a switched capacitor array having a plurality of capacitors using at least one of turn off thyristors or parallel reverse combinations as switches to create a turn off TRIAC connecting at last two of the plurality of capacitors;
a controller device operating at a frequency higher than an AC rectified half wave coupled to the switched capacitor array responsive to a voltage of the rectified AC half wave, the controller device forming capacitor combinations from the plurality of capacitors such that the capacitor combinations do not exceed their individual maximum voltage ratings during a first part of a frequency cycle, the controller device rearranging the capacitor combination resulting in a desired output voltage during a second part of the frequency cycle; and;
at least one of coupling devices for connecting the plurality of capacitors by the turn off thyristors to the voltage of the AC half wave during the first part of the frequency cycle and then to an output during the second part of the frequency cycle.

### Claim 31 (depends on 7)

An offline charge pump in accordance with claim 7, further comprising a plurality of plate members, wherein the plurality of plate members are separately segmented out to form a plurality of pinned out segments, the plurality of pinned out segments forming the plurality of capacitors.