# US 12,224,578 B2 · Source circuit and power supply and electric system

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- Number: US 12,224,578 B2
- Document ID: US12224578B2
- Status: Granted
- Kind: B2
- Application number: 17/772,256
- Filed: 2019-11-25
- Published: 2022-11-24
- Granted: 2025-02-11
- Earliest claimed: 2019-11-25
- Assignees: Tridonic GmbH & Co KG
- Applicants: Tridonic GmbH & Co KG
- Inventors: Xinhai Li; Yaofeng Lin; Zongjie Wu; Harald Netzer
- Web page: https://patentgrep.com/patent/US12224578B2

## CPC

- H02H 9/002: {limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers}
- H05B 45/52: in a parallel array of LEDs
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A source circuit, a power supply and an electric system. The source circuit includes at least one voltage source supplied from a mains circuit and used to provide at least one voltage for at least one device and at least one switch respectively connected to the at least one voltage source and controlled to be turned on according to a voltage of the mains circuit and/or at a timing after the mains circuit being applied corresponding to the device.

## Claims

### Claim 1

A source circuit, comprising:
one or more voltage sources supplied from a mains circuit receiving AC power or rectified AC power, wherein each voltage source is configured to supply DC voltage to a device comprising one or more LEDs; and
one or more switches respectively connected between the one or more voltage sources and the device to which the respective voltage source supplies DC voltage and wherein each switch is controlled to be turned on according to a timing, after the mains circuit is applied, corresponding to the device for which the respective voltage source is configured to supply DC voltage, and further wherein the timing is a random value corresponding to the respective device, and the random value timing for each switch is stored on the switch.

### Claim 2 (depends on 1)

The source circuit according to claim 1, wherein the source circuit comprises multiple voltage sources and multiple switches.

### Claim 3 (depends on 2)

The source circuit according to claim 2, wherein, the timing is in a predetermined period corresponding to the respective device, and the predetermined periods corresponding to different devices are different or overlapped.

### Claim 4 (depends on 2)

A power supply comprising:
a mains circuit receiving AC power or rectified AC power; and
a source circuit according to claim 2 and multiple devices.

### Claim 5 (depends on 1)

The source circuit according to claim 1, wherein the switch is a transistor.

### Claim 6 (depends on 1)

The source circuit recited in claim 1 wherein each voltage source includes at least one capacitor to be charged.

### Claim 7 (depends on 1)

A power supply comprising:
a mains circuit receiving AC power or rectified AC power; and
at least two source circuits according to claim 1 and at least two devices.

### Claim 8

A power supply including:
a mains circuit receiving AC power or rectified AC power;
a source circuit comprising:
a plurality of voltage sources supplied from the mains circuit, wherein each voltage source is configured to supply DC voltage to a device comprising one or more LEDs, wherein the voltage sources are DALI LED drivers; and
a switch connected between each voltage source and the device to which the respective voltage source supplies DC voltage;
a DALI controller providing timing information after the mains circuit is applied for which the respective voltage supply is configured to supply DC voltage;
a DALI bus to which the DALI controller and the DALI LED drivers are connected; and
a DALI power supply connected to the mains circuit and supplying DC voltage to the DALI bus;
wherein the DALI controller provides the timing information to the DALI LED drivers via the DALI bus and the DALI LED drivers 804 connect to the mains circuit according to the timing information.

### Claim 9 (depends on 8)

The power supply according to claim 8, wherein each switch is turned on when the voltage of the mains circuit is zero or a minimum value.

### Claim 10 (depends on 8)

The power supply according to claim 8, wherein the DALI controller is further used to detect the voltage of the mains circuit.

### Claim 11 (depends on 8)

The power supply according to claim 8, wherein the DALI controller is further used to predetermine or determine the timing information corresponding to the device.

### Claim 12 (depends on 11)

The power supply according to claim 11, wherein, the DALI controller determines the period corresponding to the device and randomizes the timing in the period.

### Claim 13 (depends on 8)

The power supply recited in claim 8 wherein each voltage source includes at least one capacitor to be charged.

### Claim 14 (depends on 8)

The power supply recited in claim 8 wherein the switch is a transistor.