US 12,408,246 B2 · LED lighting circuit, temporal dimmer circuit and control method based on PWM

Abstract

Disclosed is an LED lighting circuit based on PWM, including a power source, a control circuit and an LED light-emitting element, and further including a non-light-emitting load element. The non-light-emitting load element is connected in parallel to the LED light-emitting element, the power source is connected to a constant-current source, the constant-current source supplies power to the LED light-emitting element and the non-light-emitting load element, and when the constant-current source is in a current rising or falling phase, the control circuit controls an LED light-emitting element loop to be disconnected, and controls a non-light-emitting load element loop to be connected; and when the current of the constant-current source is in a steady state, the control circuit controls the non-light-emitting load element loop to be disconnected, and controls the LED light-emitting element loop to be connected.

Claims15

Dependent claims

An LED lighting circuit based on PWM, comprising a power source, a control circuit and an LED light-emitting element, and further comprising a non-light-emitting load element, the non-light-emitting load element being connected in parallel to the LED light-emitting element, the power source being connected to a constant-current source, the constant-current source supplying power to the LED light-emitting element and the non-light-emitting load element, and when the constant-current source is in a current rising or falling phase, the control circuit controlling an LED light-emitting element loop to be disconnected, and controlling a non-light-emitting load element loop to be connected;

and when the current of the constant-current source is in a steady state, the control circuit controlling the non-light-emitting load element loop to be disconnected, and controlling the LED light-emitting element loop to be connected.

A temporal dimmer control circuit based on PWM, the control circuit comprising:

a main power source used for supplying power to the control circuit;
at least two LED light-emitting elements,
a constant-current source, used for providing a drive current to the LED light-emitting elements;
a switching circuit used for controlling the on/off of a connection between the constant-current source and the LED light-emitting elements;
and
a control module used for controlling the on/off of the switching circuit;
wherein the constant-current source, the switching circuit, and the LED light-emitting elements being connected in series;
wherein the switching circuit comprising at least two switches, each switch controlling one LED light-emitting element, and the control module outputting a PWM control signal to control the on/off of the switching circuit;
wherein, when the two LED light-emitting elements are switched, the control module controlling PWM waveforms corresponding to the two LED light-emitting elements to be partially overlapped;
wherein the control circuit further comprises a non-light-emitting load element, the non-light-emitting load element being connected in parallel to the LED light-emitting element;
wherein, in a current rising or falling phase of the constant-current source, the control module controls an LED light-emitting element loop to be disconnected, and controls a non-light-emitting load element loop to be connected;
and
wherein, when the current of the constant-current source is steady, the control module controls the non-light-emitting load element loop to be disconnected, and controls the LED light-emitting element loop to be connected.

10 more elements

Dependencies are inferred from the claim text.

LED lighting circuit, temporal dimmer circuit and control method based on PWM

Life of this patent

LED lighting circuit, temporal dimmer circuit and control method based on PWM

Life of this patent

Abstract

Claims15