SPLIT CURRENT MIRROR LINE SENSING
First Claim
1. A controller for regulating a power converter, the controller comprising:
- a line sensing circuit coupled to receive an input sense signal representative of an input voltage to the power converter, the line sensing circuit comprising;
a first transistor coupled to receive a first portion of the input sense signal; and
a current mirror coupled to receive a second portion of the input sense signal and output a filtered input sense signal; and
a control circuit coupled to receive the filtered input sense signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus and methods for filtering the transients of an input signal of an integrated circuit while maintaining a constant voltage at an input terminal of the integrated circuit are disclosed. In one example, the integrated circuit can be a controller of a switched-mode power supply. The controller can include a line sensing circuit coupled to receive an input signal representative of the line voltage and operable produce an output signal that can be used by other circuits within the controller. The input signal may include a current through a sense resistor coupled between the input of the power supply and the line sensing circuit. The output signal may include a scaled and filtered version of this current. The line sensing circuit can be coupled to the input terminal of the controller to receive the input signal or can directly receive the input signal.
-
Citations
32 Claims
-
1. A controller for regulating a power converter, the controller comprising:
-
a line sensing circuit coupled to receive an input sense signal representative of an input voltage to the power converter, the line sensing circuit comprising; a first transistor coupled to receive a first portion of the input sense signal; and a current mirror coupled to receive a second portion of the input sense signal and output a filtered input sense signal; and a control circuit coupled to receive the filtered input sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A power converter, comprising:
-
a power switch; and a controller for regulating the power converter, the controller comprising; a line sensing circuit coupled to receive an input sense signal representative of an input voltage to the power converter, the line sensing circuit comprising; a first transistor coupled to receive a first portion of the input sense signal; and a current mirror coupled to receive a second portion of the input sense signal and output a filtered input sense signal; and a control circuit coupled to receive the filtered input sense signal, wherein the control circuit is configured to generate a drive signal configured to switch the power switch between an ON state and an OFF state to regulate the output of the power converter based at least in part on the filtered input sense signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A method for filtering a sense signal in a power converter, the method comprising:
-
receiving an input sense signal representative of an input voltage to the power converter; and filtering, by a line sensing circuit, a transient portion of the input sense signal to generate a filtered input sense signal, wherein the line sensing circuit comprises; a first transistor coupled to receive a first portion of the input sense signal; and a current minor coupled to receive a second portion of the input sense signal and output the filtered input sense signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
-
Specification