INDEPENDENTLY ADJUSTABLE CURRENT AND VOLTAGE AC-AC CONVERTER

• US 20130193868A1
• Filed: 01/30/2013
• Published: 08/01/2013
• Est. Priority Date: 02/01/2012
• Status: Active Grant

• Current Assignee: Dialight Corporation (Dialight PLC)
• Original Assignee: Dialight Corporation (Dialight PLC)
• Inventors: BUENO, DAVID L., Harvey, Cameron L.
• Granted Patent: US 9,380,676 B2
• Time in Patent Office: Days
• US Class Current: 315/247
• CPC Class Codes: H02M 1/12 Arrangements for reducing harmonics from ac input or output
• CPC Class Codes: H02M 1/42 Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 5/04 by static converters controlling transformers, reactors or choke coils, e.g. by tap changing H02P13/00
• CPC Class Codes: H02M 5/293 using semiconductor devices only
• CPC Class Codes: H05B 41/24 in which the lamp is fed by high frequency ac, or with separate oscillator frequencyH05B41/26 takes precedence
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: H05B 47/175 by remote control
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The present disclosure is directed to an alternating current (AC) to AC converter circuit for independently adjusting a current and voltage to adjust a light output of a light operating on AC power. In one embodiment, the AC to AC converter circuit includes a microprocessor, a first switch coupled to the microprocessor, a power factor controller (PFC) module coupled to the first switch, wherein the first switch is controlled by the microprocessor in accordance with a desired power output, one or more boost switches coupled to the PFC module, wherein the one or more boost switches are controlled by the PFC module as a function of an operation of the first switch and one or more load switches coupled to the one or more boost switches, wherein the one or more load switches are controlled by the microprocessor in accordance with the desired power output.

Claims

1. An alternating current (AC) to AC converter circuit for independently adjusting a current and voltage to adjust a light output of a light operating on AC power, comprising:

a microprocessor;

a first switch coupled to the microprocessor;

a power factor controller (PFC) module coupled to the first switch, wherein the first switch is controlled by the microprocessor in accordance with a desired power output;

one or more boost switches coupled to the PFC module, wherein the one or more boost switches are controlled by the PFC module as a function of an operation of the first switch; and

one or more load switches coupled to the one or more boost switches, wherein the one or more load switches are controlled by the microprocessor in accordance with the desired power output.

2. The AC to AC converter circuit of claim 1, further comprising:

a metering module coupled to the microprocessor, wherein the metering module monitors a current level and a voltage level and provides the current level and the voltage level to the microprocessor.

3. The AC to AC converter circuit of claim 2, further comprising:

a resistor coupled to the metering module to measure the current level.

4. The AC to AC converter circuit of claim 1, further comprising:

a filter coupled to the PFC module and the one or more load switches.

5. The AC to AC converter circuit of claim 4, wherein the filter is a dynamic filter.

6. The AC to AC converter circuit of claim 4, wherein the filter is a static filter.

7. The AC to AC converter circuit of claim 1, further comprising:

one or more communication modules coupled to the microprocessor.

8. The AC to AC converter circuit of claim 7, wherein the one or more communication modules comprise at least one of:

a power line communication module (PLC) or a radio frequency (RF) communication module.

9. The AC to AC converter circuit of claim 1, wherein the one or more boost switches comprise a first boost switch and a second boost switch, wherein the first boost switch operates during a first portion of an AC wave signal and the second boost switch operates during a second portion of the AC wave signal as controlled by the PFC module in accordance with the desired power output.

10. The AC to AC converter circuit of claim 1, further comprising:

one or more commutation switches coupled to the one or more load switches.

11. A method for adjusting a light output of a light operating on alternating current (AC) power, comprising:

receiving a control signal to change an amount of power delivered to the light, wherein the power is delivered from an AC power source;

operating one or more load switches in accordance with the amount of power;

monitoring a current level and a voltage level while the one or more load switches are operating; and

sending a signal to a switch coupled to a power factor controller (PFC) module if the light is operating at a non-optimal voltage level, wherein the PFC adjusts the voltage level in accordance with an operation of the switch.

12. The method of claim 11, wherein the signal comprises a pulse width modulation (PWM) signal.

13. The method of claim 12, wherein the PWM signal determines a first duty cycle of the switch coupled to the PFC module, wherein the first duty cycle is determined based upon an increase of the voltage level that is needed to operate the light at an optimal voltage level.

14. The method of claim 13, wherein the PFC adjusts the voltage level in accordance with the operation of the switch by operating a first boost switch and a second boost switch at a second duty cycle, wherein the second duty cycle is determined based upon the increase of the voltage level that is needed to operate the light at the optimal voltage level.

15. The method of claim 11, further comprising:

monitoring the current level and the voltage level after the voltage level is adjusted by the PFC module to determine if the signal sent to the PFC module needs to be adjusted.

16. A tangible computer readable medium to store a plurality of instructions which, when executed by a processor, cause the processor to perform operations for adjusting a light output of a light operating on alternating current (AC) power, the operations comprising:

receiving a control signal to change an amount of power delivered to the light, wherein the power is delivered from an AC power source;

operating one or more load switches in accordance with the amount of power;

monitoring a current level and a voltage level while the one or more load switches are operating; and

sending a signal to a switch coupled to a power factor controller (PFC) module if the light is operating at a non-optimal voltage level, wherein the PFC adjusts the voltage level in accordance with an operation of the switch.

17. The tangible computer readable medium of claim 16, wherein the signal comprises a pulse width modulation (PWM) signal.

18. The tangible computer readable medium of claim 17, wherein the PWM signal determines a first duty cycle of a switch coupled to the PFC module, wherein the first duty cycle is determined based upon an increase of the voltage level that is needed to operate the light at an optimal voltage level.

19. The tangible computer readable medium of claim 18, wherein the PFC adjusts the voltage level in accordance with the operation of the switch by operating a first boost switch and a second boost switch at a second duty cycle, wherein the second duty cycle is determined based upon the increase of the voltage level that is needed to operate the light at the optimal voltage level.

20. The tangible computer readable medium of claim 16, further comprising:

monitoring the current level and the voltage level after the voltage level is adjusted by the PFC module to determine if the signal sent to the PFC module needs to be adjusted.