Driver circuit for providing constant voltage to an auxiliary circuit

• US 10,034,355 B2
• Filed: 05/28/2015
• Issued: 07/24/2018
• Est. Priority Date: 05/28/2015
• Status: Active Grant

• Current Assignee: Technical Consumer Products, Inc. (Quality Light Source GmbH)
• Original Assignee: Technical Consumer Products, Inc. (Quality Light Source GmbH)
• Inventors: Chen, Timothy, Hussey, Andrew, Wang, Hao
• Primary Examiner(s): King, Monica C
• Application Number:
  US14/723,553
• Publication Number:
  US 20160353555A1
• Time in Patent Office: 1,153 Days
• Field of Search: None
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/385 using flyback topology
• CPC Class Codes: H05B 47/19 via wireless transmission
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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.

Claims

1. A driver circuit receiving wireless communication over a wireless network, 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, wherein the wireless communication is indicative of whether the lighting load is to be illuminated;

a main driver for controlling current and voltage within the driver circuit such that when 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 the output voltage delivered to the lighting load is controlled by the main driver is below the forward voltage in response to the wireless communication indicating the lighting load is not to be illuminated;

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; and

an auxiliary circuit requiring a substantially constant DC voltage and in communication with the main driver, the auxiliary circuit receiving the wireless communication over the wireless network, wherein the driver circuit provides the substantially constant DC voltage at all operating conditions.

2. The driver circuit of claim 1, wherein the main driver controls the voltage within the driver circuit to provide at least the forward voltage to the lighting load in response to the wireless communication indicating the lighting load is to be illuminated.

3. 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.

4. The driver circuit of claim 3, wherein the auxiliary circuit monitors the wireless network for an OFF signal.

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

6. A driver circuit receiving wireless communication over a wireless network, 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, wherein the wireless communication is indicative of whether the lighting load is to be illuminated;

a main driver for controlling voltage within the driver circuit such that when the wireless communication indicates the lighting load is to be illuminated, then the output voltage provided to the lighting load is at least the forward voltage, and the voltage delivered to the lighting load is below the forward voltage in response to the wireless communication indicating the lighting load is not to be illuminated;

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 is operating at the burst mode and the lighting load not being illuminated; and

an auxiliary circuit requiring a substantially constant DC voltage and in communication with the main driver and receives the wireless communication over the wireless network, wherein the driver circuit provides the substantially constant DC voltage at all operating conditions.

7. The driver circuit of claim 6, wherein the main driver regulates current to the lighting load in response to the wireless communication indicating the lighting load is to be illuminated.

8. The driver circuit of claim 6, 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.

9. The driver circuit of claim 8, wherein the auxiliary circuit monitors the wireless network for an OFF signal.

10. The driver circuit of claim 9, wherein the auxiliary circuit induces a switching signal at an OFF input of the main driver in response to receiving the OFF signal over the wireless network.

11. A driver circuit receiving wireless communication over a wireless network, 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, wherein the wireless communication is indicative of whether the lighting load is to be illuminated;

a switch;

a network that selectively generates an overvoltage value;

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 wireless communication indicates 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; and

an auxiliary circuit requiring a substantially constant DC voltage, wherein the auxiliary circuit is in communication with the main driver and receives the wireless communication over the wireless network, the auxiliary circuit;

monitoring the wireless network for an OFF signal; and

inducing a switching signal at one of the plurality of inputs of the main driver in response to receiving the OFF signal over the wireless network, 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 constant DC voltage required by the auxiliary circuit during burst mode.

12. The driver circuit of claim 11, wherein the switch is part of the main driver.

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

14. The driver circuit of claim 11, wherein the switch is a metal-oxide-semiconductor field-effect transistor (MOSFET).

15. The driver circuit of claim 11, wherein the network includes a first resistor, a second resistor, a third resistor, and a node located between the first resistor, the second resistors, and the third resistor, and wherein the first resistor and the second resistor are arranged in a voltage divider.

16. The driver circuit of claim 15, comprising a second switch, the third resistor drops out of the network and the voltage at the node rises to a value at or above the overvoltage value in response to the second switch being turned OFF.

17. The driver circuit of claim 11, wherein at least one of the main driver and the auxiliary circuit are connected to a floating ground.

18. The driver circuit of claim 11, wherein at least one of the main driver and the auxiliary circuit are connected to a common ground of the driver circuit.

19. The driver circuit of claim 11, 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.

20. The driver circuit of claim 11, wherein the lighting load is a light emitting diode (LED).

21. The driver circuit of claim 11, wherein the lighting load includes a forward voltage of about 12 volts.

22. The driver circuit of claim 11, 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.

23. The driver circuit of claim 22, wherein the auxiliary circuit generates a pulse-width modulated (PWM) signal received by the dimming input of the main driver.

24. The driver circuit of claim 23, 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.

25. The driver circuit of claim 11, 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.

26. The driver circuit of claim 25, wherein the voltage at the loop compensation pin rises to a required value to increase a response time of the main driver such that the main driver increases the frequency of the burst packets to the threshold frequency in response to the second switch being turned OFF.

27. The driver circuit of claim 11, wherein the auxiliary circuit is in communication with a second switch, and wherein the second switch is in communication with a power input of the main driver through a capacitor.

28. The driver circuit of claim 27, wherein the capacitor charges in response to turning the second switch OFF, and the capacitor is removed from the driver circuit in response to turning the second switch ON.