METHOD AND APPARATUS PROVIDING PROTECTION FOR POWER CONVERTER
First Claim
Patent Images
1. A switching control circuit for a power converter, comprising:
- an input circuit coupled to receive a threshold signal at an input terminal;
a first comparator coupled to receive a signal representative of the current of a power switch, the first comparator to generate a control signal in response to the signal and the threshold signal;
a second comparator coupled to receive the signal to limit the current of the power switch;
a timer circuit coupled to generate a timing signal at a timer terminal in response to the control signal, the timer circuit to generate a time-out signal in response to the timing signal;
wherein the time-out signal is used to turn off the power switch.
5 Assignments
0 Petitions
Accused Products
Abstract
The invention presents a surge output protection for a control circuit of power converter. It comprises an input circuit for generating a threshold signal. A first comparator is coupled to receive a signal representative the current through a power switch. The first comparator further generates a control signal in response to the signal and the threshold signal. A timer circuit is utilized to generate a time-out signal in response to the control signal. The time-out signal is coupled to turn off the power switch.
-
Citations
15 Claims
-
1. A switching control circuit for a power converter, comprising:
-
an input circuit coupled to receive a threshold signal at an input terminal; a first comparator coupled to receive a signal representative of the current of a power switch, the first comparator to generate a control signal in response to the signal and the threshold signal; a second comparator coupled to receive the signal to limit the current of the power switch; a timer circuit coupled to generate a timing signal at a timer terminal in response to the control signal, the timer circuit to generate a time-out signal in response to the timing signal; wherein the time-out signal is used to turn off the power switch. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A control circuit for a power converter, comprising:
-
an input circuit generating a threshold signal; a first comparator coupled to receive a signal representative of the current through a power switch, the first comparator to generate a control signal in response to the signal and the threshold signal; a timer circuit coupled to generate a time-out signal in response to the control signal; wherein the time-out signal is used to turn off the power switch. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A switching circuit for power converter, comprising:
-
an oscillation circuit generating a switching signal for regulating the output of the power converter; a first circuit generating a threshold signal; a first comparator coupled to receive a signal representative of the current through a power switch, the first comparator to generate a control signal in response to the signal and the threshold signal; wherein the frequency of the switching signal is increased in response to the enable of the control signal. - View Dependent Claims (12, 13, 14, 15)
-
Specification