Driver circuit for providing constant voltage to an auxiliary circuit

Patent metadata

Field	Value
Publication number	US-10728993-B2
Application number	US-201916285017-A
Country	US
Kind code	B2
Filing date	Feb 25, 2019
Priority date	May 28, 2015
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A driver circuit receiving wireless communication over a wireless network is disclosed. The driver circuit includes a lighting load, a main driver, and an auxiliary driver. The lighting load is selectively illuminated based on an output voltage being provided to the lighting load that is at least a forward voltage of the lighting load. The wireless communication is indicative of whether the lighting load is to be illuminated. The main driver is for controlling current and voltage within the driver circuit such that if the wireless communication indicates the lighting load is to be illuminated, then the current delivered to the lighting load is regulated by the main driver, and if the wireless communication indicates the lighting load is not to be illuminated, then the output voltage delivered to the lighting load is controlled by the main driver is below the forward voltage.

First claim

What is claimed is:

1. A driver circuit for providing substantially constant DC voltage to an auxiliary circuit, the driver circuit comprising:
a lighting load having a forward voltage, the lighting load selectively illuminated based on an output voltage being provided to the lighting load that is at least the forward voltage;
a main driver for controlling current and voltage within the driver circuit such that when the lighting load is to be illuminated, then the current delivered to the lighting load is regulated by the main driver, and when the the lighting load is not to be illuminated, then the output voltage delivered to the lighting load is controlled by the main driver to be below the forward voltage; and
a switch drivable by the main driver, the main driver driving the switch at a burst mode in response to receiving an overvoltage value from the driver circuit, wherein the output voltage is less than the forward voltage of the lighting load in response to the switch operating at the burst mode and the lighting load not being illuminated;
wherein the auxiliary circuit is in communication with the main driver, and the driver circuit provides the auxiliary circuit with a substantially constant DC voltage at all operating conditions.

2. The driver circuit of claim 1 , wherein the main driver causes the switch to operate in at least one burst packet during the burst mode, and wherein the burst packet is representative of the switch opening and closing once.

3. The driver circuit of claim 2 , wherein the auxiliary circuit monitors a sensor for an OFF signal.

4. The driver circuit of claim 3 , wherein the auxiliary circuit induces a switching signal at an OFF input of the main driver in response to receiving the OFF signal.

5. A driver circuit for providing substantially constant DC voltage to an auxiliary circuit, the driver circuit comprising:
a lighting load having a forward voltage, the lighting load selectively illuminated based on an output voltage being provided to the lighting load that is at least the forward voltage;
a main driver for controlling voltage within the driver circuit such that when the lighting load is to be illuminated, then the output voltage provided to the lighting load is at least the forward voltage, and when the lighting load is not to be illuminated, then the voltage delivered to the lighting load is below the forward voltage; and
a switch drivable by the main driver, the main driver driving the switch at a burst mode in response to receiving an overvoltage value from the driver circuit, wherein the output voltage is less than the forward voltage of the lighting load in response to the switch operating at the burst mode and the lighting load not being illuminated;
wherein the auxiliary circuit is in communication with the main driver, and the driver circuit provides the auxiliary circuit with a substantially constant DC voltage at all operating conditions.

6. The driver circuit of claim 5 , wherein the main driver causes the switch to operate in at least one burst packet during the burst mode, and wherein the burst packet is representative of the switch opening and closing once.

7. The driver circuit of claim 6 , wherein the auxiliary circuit monitors a sensor for an OFF signal.

8. The driver circuit of claim 7 , wherein the auxiliary circuit induces a switching signal at an OFF input of the main driver in response to receiving the OFF signal.

9. A driver circuit for providing substantially constant DC voltage to an auxiliary circuit, the driver circuit comprising:
a lighting load having a forward voltage, the lighting load selectively illuminated based on an output voltage being provided to the lighting load that is at least the forward voltage of the lighting load;
a switch;
a network that selectively generates an overvoltage value; and
a main driver including a plurality of inputs, the main driver in communication with the switch and the network, the main driver causing the switch to operate in burst packets at a burst mode in response to receiving the overvoltage value from the network, the main driver controlling voltage to the lighting load such that when the lighting load is not to be illuminated then the forward voltage is not provided to the lighting load and the lighting load is not illuminated;
wherein the auxiliary circuit is in communication with the main driver, and the auxiliary circuit is configured to induce a switching signal at one of the plurality of inputs of the main driver in response to a voltage in the auxiliary circuit below a substantially constant voltage required by the auxiliary circuit, and in response to receiving the switching signal the main driver increases a frequency of the burst packets to a threshold frequency to generate the substantially constant DC voltage required by the auxiliary circuit during burst mode.

10. The driver circuit of claim 9 , wherein the switch is part of the main driver.

11. The driver circuit of claim 9 , wherein the switch is located external to the main driver.

12. The driver circuit of claim 9 , wherein the switch is a metal-oxide-semiconductor field-effect transistor (MOSFET).

13. The driver circuit of claim 9 , wherein the network includes a first resistor, a second resistor, a third resistor, and a node located between the first resistor, the second resistor, and the third resistor, and wherein the first resistor and the second resistor are arranged in a voltage divider.

14. The driver circuit of claim 13 , comprising a second switch, wherein when the second switch is turned OFF then the third resistor drops out of the network and the voltage at the node rises to a value at or above the overvoltage value.

15. The driver circuit of claim 9 , wherein at least one of the main driver and the auxiliary circuit are connected to a floating ground.

16. The driver circuit of claim 9 , wherein at least one of the main driver and the auxiliary circuit are connected to a common ground of the driver circuit.

17. The driver circuit of claim 9 , wherein the auxiliary circuit is in communication with a second switch, and in response to the second switch being turned OFF the network generates the overvoltage value.

18. The driver circuit of claim 9 , wherein the lighting load is a light emitting diode (LED).

19. The driver circuit of claim 9 , wherein the lighting load includes a forward voltage of about 12 volts.

20. The driver circuit of claim 9 , wherein the main driver is for light emitting diode (LED) dimming control, and wherein one of the plurality of inputs of the main driver includes a dimming input.

21. The driver circuit of claim 20 , wherein the auxiliary circuit generates a pulse-width modulated (PWM) signal received by the dimming input of the main driver.

22. The driver circuit of claim 21 , wherein the auxiliary circuit increases the duty cycle of the PWM signal to a threshold duty cycle, and wherein increasing the duty cycle of the PWM signal to the threshold duty cycle causes the main driver to increase the frequency of the burst packets during burst mode such that the driver circuit generates the constant DC voltage.

23. The driver circuit of claim 9 , wherein the auxiliary circuit is in communication with a second switch, and wherein the second switch is in communication with a loop compensation input of the main driver.

24. The driver circuit of claim 23 , wherein when the second switch is turned OFF then the voltage at the loop co

Assignees

• Chen Timothy
• Hussey Andrew
• Wang Hao
• Technical Consumer Products Inc

Inventors

• Chen Timothy
• Hussey Andrew
• Wang Hao

Classifications

• H05B47/196

  characterised by user interface arrangements · CPC title

• H05B47/19 Primary

  via wireless transmission · CPC title

• H05B45/385

  using flyback topology · CPC title

• H05B45/3725

  Switched mode power supply [SMPS] · CPC title

• H05B45/10

  Controlling the intensity of the light · CPC title