US 2026/0255453 A1 · Constant Voltage PWM to Constant Current PWM Driver System with Thermal and Current Feedback

Abstract

A driver system suitable for a light emitting diode (LED) illumination system has a driver adapted to receive a constant voltage pulse-width modulated (PWM) power from a controller and to output constant current PWM power to regulate current through a load. The driver has a series regulator operable to convert the constant voltage PWM power. The series regulator proves an internal voltage reference and internal temperature compensation and is operable to regulate the current through the load with high precision over a wide temperature range, and is powered solely by the constant voltage PWM power. The driver is operable to vary the duty cycle of the load from 100 percent to zero or near zero percent at high PWM frequencies without perceptible flicker or jitter in semiconductor light sources.

Claims20

Dependent claims

A pulse-width modulated (PWM) driver system comprising:

a driver operable to receive a constant voltage pulse-width modulated (PWM) power and operable to output a constant current PWM power to a load, in response to the constant voltage pulse-width modulated (PWM) power;
and the driver being powered solely by the constant voltage pulse-width modulated (PWM) power.

An illumination system, comprising:

a driver operable to receive a constant voltage pulse-width modulated (PWM) power and operable to output a constant current PWM power to a load, in response to the constant voltage pulse-width modulated (PWM) power;
the driver being operable to provide high-precision regulation of the current through the load over a wide temperature range;
the driver being powered solely by the constant voltage pulse-width modulated (PWM) power;
and the load including a semiconductor light source.

1 more element

An illumination system comprising:

an LED string of one or more LEDs connected in series;
a series regulator operable to receive a constant voltage pulse-width modulated (PWM) power and operable to convert the constant voltage PWM power to constant current PWM power to power the LED string;
the series regulator providing an internal voltage reference and internal temperature compensation;
the series regulator being operable to regulate the current through the LED string with high precision over a wide temperature range;
and the series regulator being powered solely by the constant voltage PWM power.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

19/646,457Filed 13 Apr 2026

Priority

27 Oct 2022

Published

27 Aug 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

H05B 45/325
Pulse-control circuits: pulse-width modulation [PWM]
H05B 45/46
With an active control inside an LED matrix: having LEDs disposed in parallel lines
H05B 45/10
Circuit arrangements for operating light-emitting diodes [LED]: controlling the intensity of the light
H05B 45/20
Circuit arrangements for operating light-emitting diodes [LED]: controlling the colour of the light

Family

Application63/419,841Us provisional application · filed 27 Oct 2022

Application18/496,553Continuation in part · filed 27 Oct 2023

Application19/646,457Continuation in part

US 12,652,736 B2Related patent

US 2024/0147588 A1Published application

US 2026/0255453 A1This patent

From the US filing history. Foreign family members aren’t listed.

Constant Voltage PWM to Constant Current PWM Driver System with Thermal and Current Feedback

Life of this patent

Constant Voltage PWM to Constant Current PWM Driver System with Thermal and Current Feedback

Life of this patent

Abstract

Claims20