Method and apparatus to control a power converter having a low loop bandwidth
First Claim
1. A controller for use in a power converter, comprising:
- a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter;
a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit, wherein the feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal;
a state machine coupled to the feedback sensor circuit to control switching of a switch of the power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit, wherein the switching of the switch is coupled to control a transfer of energy from an input of the power converter to the output of the power converter such that an input current flowing in the input of the power converter is substantially in phase with and proportional to a voltage at the input of the power converter; and
a feedback time period signal generator coupled to generate a feedback time period signal coupled to be received by the state machine, wherein a period of the feedback time period signal is substantially greater than a period of the feedback sampling signal, wherein the state machine is coupled to be updated in response to the feedback time period signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A power converter controller is disclosed. An example power converter controller includes a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter. The controller also includes a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit. The feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal. The controller also includes a state machine coupled to the feedback sensor circuit to control switching of a switch of the power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit. The controller also includes a feedback time period signal generator coupled to generate a feedback time period signal coupled to be received by the state machine. A period of a feedback time period signal is substantially greater than a period of the feedback sampling signal. The state machine is coupled to be updated in response to the feedback time period signal.
54 Citations
37 Claims
-
1. A controller for use in a power converter, comprising:
-
a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter; a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit, wherein the feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal; a state machine coupled to the feedback sensor circuit to control switching of a switch of the power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit, wherein the switching of the switch is coupled to control a transfer of energy from an input of the power converter to the output of the power converter such that an input current flowing in the input of the power converter is substantially in phase with and proportional to a voltage at the input of the power converter; and a feedback time period signal generator coupled to generate a feedback time period signal coupled to be received by the state machine, wherein a period of the feedback time period signal is substantially greater than a period of the feedback sampling signal, wherein the state machine is coupled to be updated in response to the feedback time period signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A power converter, comprising:
-
an energy transfer element coupled between an input of the power converter and an output of the power converter, wherein the input of the power converter is to be coupled to a source of ac voltage and wherein the output of the power converter is to be coupled to a load; a switch coupled to the energy transfer element; and a controller coupled to the switch, the controller coupled to receive a feedback signal representative of the output of the power converter to control switching of the switch in response to the feedback signal to control a transfer of energy from the input of the power supply to the output of the power converter, wherein the switching of the switch is coupled to control the transfer of energy such that an input current flowing in the input of the power converter is substantially in phase with and proportional to a voltage at the input of the power converter, the controller including a feedback sensor circuit coupled to receive the feedback signal; a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit, wherein the feedback sensor circuit is coupled to sample feedback information from the feedback signal at a feedback sampling frequency in response to the feedback sampling signal; a state machine coupled to the feedback sensor circuit to control switching of the switch according to one of a plurality of operating condition states in response to the feedback sensor circuit; and a feedback time period signal generator coupled to generate a feedback time period signal coupled to update the state machine, wherein a period of the feedback time period signal is substantially greater than a period of the feedback sampling signal, wherein the state machine is coupled to maintain an operating condition state until an end of each period of the feedback time period signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. A method for controlling a power converter, comprising:
-
sampling feedback information from a feedback signal representative of an output of the power converter at a feedback sampling frequency; comparing the sampled feedback information with a first threshold level; adjusting a value at the rate of the feedback sampling frequency in response to the comparison of the sampled feedback information with the first threshold level; and setting an operating condition for switching a switch of the power converter at an end of each period of a feedback time period signal in response to the value to control a transfer of energy from an input of the power converter to an output of the power converter, wherein the frequency of the feedback time period signal is substantially less than the feedback sampling frequency, wherein an input current flowing in the input of the power converter is substantially in phase with and proportional to a voltage at the input of the power converter. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
-
Specification