US 2024/0196493 A1 · PULSE WIDTH MODULATION SIGNAL GENERATION CIRCUIT AND LAMP CONTROL SYSTEM INCLUDING THE SAME

Abstract

Disclosed are a pulse width modulation (PWM) signal generation circuit and a lamp control system including the same. The PWM signal generation circuit includes a counting circuit configured to generate a counting signal, a pulse period control circuit configured to convert the counting signal into a first analog output signal and compare the first analog output signal with a first comparison voltage to generate a first output signal, a pulse width control circuit configured to convert the counting signal into a second analog output signal and to compare the second analog output signal with a second comparison voltage to generate a second output signal, and a control logic circuit configured to determine a period of a PWM signal based on the first output signal, determine a pulse width of the PWM signal based on the second output signal, and output the PWM signal having the period and the pulse width.

Claims20

Dependent claims

A pulse width modulation (PWM) signal generation circuit comprising:

a counting circuit configured to generate a counting signal by counting one of a rising edge and a falling edge of a clock signal;
a pulse period control circuit configured to convert the counting signal into a first analog output signal and to compare the first analog output signal with a first comparison voltage to generate a first output signal corresponding to a result of the comparison;
a pulse width control circuit configured to convert the counting signal into a second analog output signal and to compare the second analog output signal with a second comparison voltage to generate a second output signal corresponding to a result of the comparison;
and
a control logic circuit configured to:
determine a period of a PWM signal based on the first output signal;
determine a pulse width of the PWM signal based on the second output signal;
and
output the PWM signal having the period and the pulse width.

6 more elements

A lamp control system comprising:

a lamp;
and
a lamp driving circuit configured to drive the lamp,
wherein the lamp driving circuit comprises:
a switch configured to supply a driving signal for driving of the lamp to the lamp in response to a control signal;
a pulse width modulation (PWM) signal generation circuit configured to generate a PWM signal;
and
a current control circuit configured to generate the control signal in response to the PWM signal,
wherein the PWM signal generation circuit is configured to:
generate a first output signal based on a counting signal generated by counting a clock signal;
determine a period of the PWM signal based on the first output signal;
generate a second output signal based on the counting signal;
and
determine a pulse width of the PWM signal based on the second output signal.

11 more elements

Dependencies are inferred from the claim text.

Pulse width modulation signal generation circuit and lamp control system including the same

Life of this patent

Pulse width modulation signal generation circuit and lamp control system including the same

Life of this patent

Abstract

Claims20