US 10,772,170 B2 · TRIAC dimmer detection circuit, chip and method, and LED driving chip and system

Abstract

Provided are a TRIAC dimmer detection circuit, chip and method, and an LED driving chip and system. A bus voltage reflecting signal is received, and a TRIAC dimmer detection signal is generated according to the bus voltage reflecting signal, a first reference voltage and a second reference voltage, the dimmer detection signal being used to detect whether a dimmer exists and to determine the type of the dimmer. The TRIAC dimmer detection circuit, chip and method, and the LED driving chip and system consistent with the present invention can detect whether a TRIAC dimmer is contained in an LED illuminating system, so as to determine a working state of a bleeder, thereby reducing the power consumption of the entire LED illuminating system and improving the efficiency thereof.

Claims30

Dependent claims

A dimmer detection circuit comprising:

a sampling unit, coupled to output of a rectifier and configured to output a signal representing a bus voltage;
a first comparator coupled to the sampling unit and configured to receive a first reference voltage and the signal, and generate a first processing signal;
a second comparator coupled to the sampling unit and configured to receive a second reference voltage and the signal, and generate a second processing signal;
and
a control unit configured to receive the first processing signal and the second processing signal to detect the slope of the bus voltage change from the first reference voltage to the second reference voltage;
wherein
the control unit outputs a dimmer detection result which indicates a leading edge phase cut or a trailing edge phase cut dimmer is present or neither by detects falling edge or rising edge of the first processing signal and the second processing signal.

4 more elements

A dimmer detection method, comprising the following steps:

step 1:
acquiring, by a voltage division unit including a first resistance and a second resistance in series, a signal representing the bus voltage;
and
step 2:
generating, by a dimmer detection circuit, a dimmer detection signal according to the bus voltage reflecting signal, a first reference voltage and a second reference voltage;
wherein step 2 comprises:
generating a first processing signal according to the signal representing the bus voltage and the first reference voltage, and delaying the first processing signal;
generating a second processing signal according to the signal representing the bus voltage;
generating a dimmer detection signal according to the first processing signal, the second processing signal and the delayed first processing signal, the dimmer detection signal is a leading-edge phase-cut dimmer detection signal.

6 more elements

Dependencies are inferred from the claim text.

TRIAC dimmer detection circuit, chip and method, and LED driving chip and system

Life of this patent

TRIAC dimmer detection circuit, chip and method, and LED driving chip and system

Life of this patent

Abstract

Claims30