US 2016/0261258 A1 · Three Input Comparator

Abstract

A three input voltage comparator provides termination of a pulse width modulation (PWM) output in a switched mode power supply. Shutdown of the PWM signal occurs when a sense current from the switching transistors exceeds either or both of the limit and error current references. The three input voltage comparator replaces the generally used two input voltage comparator and also eliminates the necessity of having to provide a voltage clamping circuit on the output of the voltage error amplifier in the switched mode power supply. The three input voltage comparator may also comprise selectable polarity control for more versatile integration of it into a switched mode power supply design.

Claims22

Dependent claims

A three input voltage comparator, comprising:

a first input;
a second input;
a third input;
and
an output having either at a first or second logic level, wherein when voltages on:
the first input is less than the second and third inputs the output is at the first logic level,
the first input is greater than the second and less than the third input the output is at the second logic level,
the first input is greater than the second and third inputs the output is at the second logic level, and
the first input is less than the second and greater than the third input the output is at the second logic level.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/060,539Filed 3 Mar 2016

Priority

6 Mar 2015

Published

8 Sep 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03K 5/24
Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal…
H02M 3/158
With automatic control of output voltage or current, e.g. switching regulators: including plural semiconductor devices as final control devices…
H03K 5/2481
Using field effect transistors: with at least one differential stage
H03K 7/08
Modulating pulses with a continuously-variable modulating signal: duration or width modulation ; Duty cycle modulation

Three Input Comparator

Life of this patent

Three Input Comparator

Life of this patent

Abstract

Claims22