POWER SUPPLY DEVICE AND LIGHTING EQUIPMENT PROVIDED WITH POWER SUPPLY DEVICE

• US 20110057577A1
• Filed: 09/01/2010
• Published: 03/10/2011
• Est. Priority Date: 03/24/2008
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Nishiie, Mitsuhiko, Hiramatsu, Takuro, OTAKE, Hirokazu
• Granted Patent: US 8,441,204 B2
• Time in Patent Office: Days
• US Class Current: 315/291
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/385 using flyback topology
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

A power supply device according to one embodiment is configured to control a lighting of semiconductor light-emitting elements, wherein a dimming signal is canceled during a predetermined time period (T) from a timing immediately after power-ON, so as to light on light-emitting diodes to have a predetermined light amount, for example, a minimum light amount. After an elapse of the predetermined time period (T), cancellation of the dimming signal is released to light on the light-emitting diodes to have a light amount instructed by the dimming signal.

Claims

1. A power supply device comprising:

a DC output generation module configured to receive an AC power, convert the AC power into a DC power, and output the DC power;

a semiconductor light-emitting element which is supplied with the DC power output from the DC output generation module, and emits light; and

a control module configured to receive a dimming signal, and control the DC power output from the DC output generation module in accordance with the dimming signal, the control module controlling the DC output generation module to dim and light on or off the semiconductor light-emitting element by canceling control of the DC power based on the dimming signal during a predetermined time period from a timing immediately after the AC power is supplied.

2. The power supply device according to claim 1, wherein the control module generates a first control signal based on a reference signal and a second control signal based on the dimming signal, controls the DC output generation module to dim and light on or off the semiconductor light-emitting element using the first control signal during the predetermined period, and controls the DC output generation module to light on the semiconductor light-emitting element according to the dimming signal using the second control signal after an elapse of the predetermined period.

3. The power supply device according to claim 1, wherein the control module includes a generation circuit which generate'"'"'s a second control signal based on the dimming signal, a differentiating circuit which includes a resistor and a capacitor and outputs a differentiated signal in response to supply of the AC power, a switching element which is turned on in response to the differentiated signal during a second time period shorter than the predetermined period and short-circuits the generation circuit, and a reset circuit which discharges the capacitor immediately after the AC power is supplied, and the differentiating circuit generates the differentiated signal after the capacitor is discharged.

4. A lighting equipment comprising:

a power supply device according to claim 1; and

an equipment main body having the power supply device.

5. A power supply device comprising:

a DC output generation module configured to receive an AC power, convert the AC power into a DC power in accordance with a dimming signal, and output the DC power;

a semiconductor light-emitting element which is supplied with the DC power output from the DC output generation module, and emits light; and

control module configured to control the DC output generation module to dim and light on or off the semiconductor light-emitting element in a predetermined dimming mode during a predetermined time period from a timing immediately after the AC power is supplied, and control the semiconductor light-emitting element to light on according to the dimming signal by controlling the DC power output from the DC output generation module according to the dimming signal after an elapse of the predetermined time period.

6. The power supply device according to claim 5, wherein the control module controls the DC output generation module to perform fade-in lighting of the semiconductor light-emitting element during the predetermined time period.

7. A lighting equipment comprising:

a power supply device according to claim 5; and

an equipment main body having the power supply device.