TRIAC DIMMER COMPATIBLE SWITCHING MODE POWER SUPPLY AND METHOD THEREOF
First Claim
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1. A switching mode power supply, comprising:
- a triac dimmer, wherein the triac dimmer configured to receive an AC input signal and to modify the AC input signal with a target phase angle to generate a shaped AC signal;
a rectifier coupled to the triac dimmer to receive the shaped AC signal, the rectifier being configured to generate a rectified signal based on the shaped AC signal;
a filter coupled to the rectifier, the filter being configured to receive the rectified signal and generate a filtered signal;
a DC/DC converter coupled to the filter to receive the filtered signal, and wherein the DC/DC converter is configured to provide power to a load;
a dimming signal generator coupled to the rectifier to receive the rectified signal, the dimming signal generator being configured to generate a dimming signal based on the rectified signal;
a feedback circuit coupled to the DC/DC converter to generate a feedback signal indicative of the power provided to the load by the DC/DC converter; and
a PFC controller having a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, and an output terminal, wherein;
the first input terminal is coupled to the dimming signal generator to receive the dimming signal;
the second input terminal is coupled to the rectifier to receive the rectified signal;
the third input terminal is coupled to the DC/DC converter to receive a sense signal indicative of a current flowing through the DC/DC converter;
the fourth input terminal is coupled to the feedback circuit to receive the feedback signal; and
based on the dimming signal, the rectified signal, the sense signal, and the feedback signal, the PFC controller provides a switching signal at the output terminal to the DC/DC converter.
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Abstract
Triac dimmer compatible switching mode power supplies used as LED drivers are disclosed herein. A PFC controller is configured in the switching mode power supplies. With the PFC controller, the current keeping the triac in the on-state is supplied by the DC/DC converter, and the LC resonance is reduced.
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Citations
20 Claims
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1. A switching mode power supply, comprising:
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a triac dimmer, wherein the triac dimmer configured to receive an AC input signal and to modify the AC input signal with a target phase angle to generate a shaped AC signal; a rectifier coupled to the triac dimmer to receive the shaped AC signal, the rectifier being configured to generate a rectified signal based on the shaped AC signal; a filter coupled to the rectifier, the filter being configured to receive the rectified signal and generate a filtered signal; a DC/DC converter coupled to the filter to receive the filtered signal, and wherein the DC/DC converter is configured to provide power to a load; a dimming signal generator coupled to the rectifier to receive the rectified signal, the dimming signal generator being configured to generate a dimming signal based on the rectified signal; a feedback circuit coupled to the DC/DC converter to generate a feedback signal indicative of the power provided to the load by the DC/DC converter; and a PFC controller having a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, and an output terminal, wherein; the first input terminal is coupled to the dimming signal generator to receive the dimming signal; the second input terminal is coupled to the rectifier to receive the rectified signal; the third input terminal is coupled to the DC/DC converter to receive a sense signal indicative of a current flowing through the DC/DC converter; the fourth input terminal is coupled to the feedback circuit to receive the feedback signal; and based on the dimming signal, the rectified signal, the sense signal, and the feedback signal, the PFC controller provides a switching signal at the output terminal to the DC/DC converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A switching mode power supply, comprising:
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a triac dimmer configured to receive an AC input voltage and modify the AC input voltage with a target phase angle to generate a shaped AC signal; a rectifier coupled to the triac dimmer to receive the shaped AC signal, the rectifier being configured to generate a rectified signal based on the shaped AC signal; a filter coupled to the rectifier to filter the rectified signal to generate a filtered signal; a DC/DC converter coupled to the filter to receive the filtered signal, and wherein the DC/DC converter having a main switch operating in ON and OFF states to provide power to a load; a dimming signal generator coupled to the rectifier to receive the rectified signal, the dimming signal generator being configured to generate a dimming signal based on the rectified signal; a feedback circuit coupled to the DC/DC converter to generate a feedback signal indicative of the power supplied to the load by the DC/DC converter; and a PFC controller having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is coupled to the dimming signal generator to receive the dimming signal, the second input terminal is coupled to the oscillator to receive the feedback signal, and wherein based on the dimming signal and the feedback signal, the PFC controller provides a switching signal at the output terminal to control the main switch. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of controlling a switching mode power supply, comprising:
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coupling an AC input signal to a triac dimmer, to modify the AC input signal with a target phase angle to get a shaped AC signal; rectifying the shaped AC signal to generate a rectified signal; filtering the rectified signal to generate a filtered signal; coupling the filtered signal to a DC/DC converter to provide power to a load, wherein the DC/DC converter, has a main switch operating in ON and OFF states; coupling the rectified signal to a dimming signal generator to generate a dimming signal; sensing a current flowing through the main switch to generate a sense signal; generating a feedback signal indicative of the power supplied to the load; and generating a switching signal in response to the rectified signal, the dimming signal, the sense signal, and the feedback signal to control the main switch. - View Dependent Claims (16, 17)
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18. A method of modulating current flowing through a load with a triac dimmer in a switching mode power supply, comprising:
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coupling an AC input signal to a triac dimmer, to modify the AC input signal with a target phase angle to generate a shaped AC signal; rectifying the shaped AC signal to generate a rectified signal; filtering the rectified signal to generate a filtered signal; coupling the filtered signal to a DC/DC converter to provide power to a load, wherein the DC/DC converter has a main switch operating in the ON and OFF states; coupling the rectified signal to a dimming signal generator to generate a dimming signal; generating a feedback signal indicative of the power supplied to the load; and generating a switching signal in response to the dimming signal and the feedback signal to control the main switch. - View Dependent Claims (19, 20)
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Specification