Systems and methods for improving transient response in H-bridge buck-boost drivers using integrated matrix manager
Presented are systems and methods for controlling a compensation circuit. In embodiments, a detection circuit receives a set of control signals that have been generated by a control circuit to drive a set of light emitting diode (LED) switches. The switches control a set of LEDs driven by a DC-DC converter that is coupled to a feedback loop to which the compensation circuit is removably coupled. In embodiments, the detection circuit determines whether the status of an LED is about to change and, in response, uses the compensation circuit to control the feedback loop in a manner such as to reduce a current overshoot or current undershoot in the LED current.
1. A method for controlling a compensation circuit, the method comprising:
at a detection circuit, receiving a set of control signals that have been generated by a control circuit to drive a set of light emitting diode (LED) switches that control a set of LEDs, the set of LEDs being driven by a DC-DC converter that is coupled to a feedback loop;
using one or more of the control signals in the set of control signals to make a determination as to whether a status of one or more of the LEDs in the set of LEDs is about to change; and
in response to the determination, using the detection circuit to control the feedback loop such as to reduce a current overshoot or current undershoot in a current that drives the set of LEDs.
2. The method of claim 1 , wherein using the detection circuit comprises, in response to the determination, controlling a switch that couples the detection circuit to at least one of the feedback loop or the compensation circuit.
3. The method of claim 1 , wherein the detection circuit and the control circuit are integrated into a single circuit to reduce a signal delay or a time-lag, or to eliminate a need to use a feedback current to control the switch.
4. The method of claim 3 , wherein the set of LEDs is integrated in the single circuit.
5. The method of claim 1 , further comprising using at least one edge of the set of control signals.
6. The method of claim 1 , wherein the detection circuit controls the feedback loop by using at least one of an edge detect circuit or a logic circuit.
7. The method of claim 6 , wherein the edge detect circuit comprises a logic decoder.
8. The method of claim 1 , wherein the set of control signals comprises a digital command.
9. The method of claim 1 , wherein the control circuit that drives the set of LEDs is a matrix manager circuit.
10. The method of claim 1 , wherein the DC-DC converter uses an H-bridge configuration to drive the set of LEDs.
11. A controller comprising:
a control circuit coupled, in a feedback loop, to a DC-DC converter that drives a set of light emitting diodes (LEDs), the control circuit generating a set of control signals;
a detection circuit coupled to the control circuit, the detection circuit, in response to receiving one or more control signals in the set of control signals, determines whether a status of one or more of the LEDs in the set of LEDs is about to change and, in response, controls the feedback loop to reduce a current overshoot or current undershoot in a current that drives the set of LEDs.
12. The controller of claim 11 , wherein controlling the feedback loop comprises using a switch that couples the detection circuit to at least one of the feedback loop or a compensation circuit.
13. The controller of claim 12 , wherein the detection circuit and the control circuit are integrated into a single circuit that performs steps comprising at least one of:
reducing a signal delay or a time-lag; or
eliminating a need to use a feedback current to control the switch.
14. The controller of claim 13 , wherein the set of LEDs is integrated in the single circuit.
15. The controller of claim 11 , wherein the detection circuit comprises an edge detect circuit and a logic circuit.
16. The controller of claim 15 , wherein the edge detect circuit comprises a logic decoder.
17. The controller of claim 15 , wherein the edge detect circuit uses at least one edge of the set of control signals.
18. The controller of claim 11 , wherein the set of control signals comprises a digital command.
19. The controller of claim 11 , wherein the control circuit is a matrix manager circuit.
20. A detection circuit for controlling a compensation circuit, the detection circuit comprising:
a logic circuit; and
an edge detect circuit that is coupled, in a feedback loop, to a control circuit that generates a set of control signals that drive a current through a set of light emitting diodes (LEDs), the edge detect circuit, in response to receiving one or more control signals, uses the logic circuit to determine whether a status of one or more LEDs is about to change and causes a switch to couple the edge detect circuit to a compensation circuit to control the feedback loop and reduce an overshoot or a undershoot in the current.