Switching power converter and control system
First Claim
Patent Images
1. An apparatus comprising:
- a switching power converter, wherein the switching power converter comprises;
an input stage comprising;
an input node to receive a time-varying input signal; and
a first inductor coupled to the input node;
an output stage, coupled to the input stage, the output stage comprising;
a capacitor; and
a second inductor coupled to the capacitor;
a switch, coupled to the input stage and the output stage, to control energy transfer to the capacitor and from the capacitor to a load; and
a switch state controller, coupled to the switch, to monitor the time-varying input signal and to supply a switching power converter control signal to the switch to modulate a switching frequency of the switch in accordance with amplitude changes of the input signal, wherein the switching frequency of the switch is greater than a frequency of the input signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A switching power converter tracks a time-varying input voltage during each cycle of the input voltage to provide power factor correction. The switching power converter includes a switch with a frequency and duty cycle modulated control signal. The switch controls the transfer of energy between the input and output of the switching power converter. The frequency of the control signal is greater than a frequency of the input signal. The control signal frequency is modulated during each cycle of the input voltage so that energy transferred from the switching power tracks the energy supplied to the switching power converter.
334 Citations
25 Claims
-
1. An apparatus comprising:
a switching power converter, wherein the switching power converter comprises; an input stage comprising; an input node to receive a time-varying input signal; and a first inductor coupled to the input node; an output stage, coupled to the input stage, the output stage comprising; a capacitor; and a second inductor coupled to the capacitor; a switch, coupled to the input stage and the output stage, to control energy transfer to the capacitor and from the capacitor to a load; and a switch state controller, coupled to the switch, to monitor the time-varying input signal and to supply a switching power converter control signal to the switch to modulate a switching frequency of the switch in accordance with amplitude changes of the input signal, wherein the switching frequency of the switch is greater than a frequency of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21, 23)
-
9. A method comprising:
-
monitoring a time-varying input signal to a switching power converter; monitoring a boost capacitor voltage of a boost capacitor of the switching power converter; and supplying a pulse width modulated switching power converter control signal to modulate a switching frequency of a switch of the switching power converter in accordance with amplitude changes of the input signal so that the switch controls both energy transfer to the boost capacitor and from the boost capacitor to a load, wherein the frequency of the control signal is greater than a frequency of the input signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 24)
-
-
17. A lighting system comprising:
-
a switching power converter comprising an input stage, a driver stage having a capacitor to receive energy from the input stage, a switch coupled to the input and driver stages, an input to receive a time-varying input signal, and an output stage having a capacitor; a switch state controller, coupled to the switch, to generate a frequency and duty cycle modulated switch control signal to control conductivity of the switch, wherein during operation of the switch state controller the switch state controller modulates a switching frequency of the switch in accordance with amplitude changes of the input signal, wherein the switching frequency of the switch is greater than a frequency of the input signal, and the switch state controller controls a duty cycle of the control signal to control an output voltage of the switch state controller and to control energy transfer to the capacitor; and a light source coupled to the switching power converter. - View Dependent Claims (18, 19, 20, 22, 25)
-
Specification