# US 12,016,101 B2 · Power supply configuration across isolation barrier

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- Number: US 12,016,101 B2
- Document ID: US12016101B2
- Status: Granted
- Kind: B2
- Application number: 17/598,264
- Filed: 2020-03-25
- Published: 2022-06-16
- Granted: 2024-06-18
- Earliest claimed: 2019-03-28
- Assignees: Signify Holding B.V.
- Applicants: Signify Holding B.V.
- Inventors: Bernd Clauberg; Yuhong Fang
- Web page: https://patentgrep.com/patent/US12016101B2

## CPC

- H05B 45/14: using electrical feedback from LEDs or from LED modules
- H05B 45/325: Pulse-width modulation [PWM]
- H05B 45/375: using buck topology
- H05B 47/183: {using digital addressable lighting interface [DALI] communication protocols}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A device, system, and method configure a power supply of a powered device. The powered device includes a digital addressable lighting interface (DALI) connected to a load to be powered by a power source. The powered device includes an isolator. The powered device includes a controller positioned on a primary side of the isolator. The controller is configured to generate a first signal to select whether to provide power to the 5 DALI at a zero current value or a maximum current value. The controller is further configured to generate a second signal to provide power to the DALI at a selected current value between the zero current value and the maximum current value.

## Claims

### Claim 1

A powered device, comprising:
a digital addressable lighting interface (DALI) connected to a load to be powered by a power source;
an opto-isolator connected to the DALI;
a controller positioned on a primary side of the opto-isolator, the controller configured to generate a first signal to select whether to provide power to the opto-isolator so that the opto-isolator is conducting or not conducting, wherein when the opto-isolator is conducting the DALI has a maximum current value and when the opto-isolator is not conducting the DALI at a zero current value, the controller further configured to generate a modulated second signal to provide power to the opto-isolator, so that the opto-isolator is conducting with a duty cycle and frequency, and wherein the DALI has a selected current value between the zero current value and the maximum current value, based on the modulated second signal; and
a buck converter receiving a current reference based on a voltage reference based on the second signal, the buck converter configured to output a fixed voltage to the DALI.

### Claim 2 (depends on 1)

The powered device of claim 1, wherein the power source is a DC power supply from a secondary winding of a transformer.

### Claim 3 (depends on 1)

The powered device of claim 1, wherein the modulated second signal is a pulse width modulation (PWM) signal having a frequency corresponding to the selected current value.

### Claim 4 (depends on 1)

The powered device of claim 1, further comprising:
a first resistor having a first resistance; and
a second resistor having a second resistance greater than a predetermined difference to the first resistance,
wherein a voltage between the first and second resistors corresponds to a modulation corresponding to the selected current value.

### Claim 5 (depends on 4)

The powered device of claim 4, further comprising:
a capacitor configured to, in conjunction with the second resistor, filter the input of the second resistor.

### Claim 6 (depends on 1)

The powered device of claim 1, wherein the maximum current value is 110 mA.

### Claim 7 (depends on 1)

The powered device of claim 1, wherein the load is a light emitting diode (LED).

### Claim 8

A method, comprising:
generating a first signal to select whether to provide power to an opto-isolator so that the opto-isolator is conducting or not conducting, wherein when the opto-isolator is conducting a digital addressable lighting interface (DALI) connected to the opto-isolator and a load to be powered by a power source has a maximum current value and when the opto-isolator is not conducting the DALI at a zero current value;
generating a modulated second signal to select to provide power to the opto-isolator, so that the opto-isolator is conducting with a duty cycle and frequency, and wherein the DALI has a selected current value that is between the zero current value and the maximum current value, based on the modulated second signal;
receiving, at a buck converter, a current reference based on a voltage reference based on the second signal; and
outputting, by the buck converter, a fixed voltage to the DALI by the buck converter.

### Claim 9 (depends on 8)

The method of claim 8, wherein the modulated second signal is a pulse width modulation (PWM) signal having a frequency corresponding to the selected current value.

### Claim 10 (depends on 8)

The method of claim 8, wherein a voltage between a first resistor having a first resistance and a second resistor having a second resistance greater than a predetermined difference to the first resistance corresponds to a modulation corresponding to the selected current value.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
filtering, by a capacitor and the second resistor, the input of the second resistor.