Digital power control system

• US 20050231988A1
• Filed: 04/12/2005
• Published: 10/20/2005
• Est. Priority Date: 04/16/2004
• Status: Abandoned Application

• Current Assignee: Yu-Lin Chi
• Original Assignee: Yu-Lin Chi
• Inventors: Li, Yong, Chi, Yu-Lin
• Application Number:
  US11/103,568
• Publication Number:
  US 20050231988A1
• Time in Patent Office: Days
• US Class Current: 363/98
• CPC Class Codes: H02M 7/53875 with analogue control of three-phase output
• CPC Class Codes: H05B 41/2828 using control circuits for the switching elements H05B41/2827 takes precedence
• CPC Class Codes: H05B 41/3927 by pulse width modulation H05B41/3922 takes precedence

Abstract

A digital power control system provides an optimal solution to power supply. The digital power control systems comprises a direct current (DC) power supply; a state configuring device generating a plurality of state signals; a pulse generator connected to the state configuring device, converting the state signals to a plurality of waveform signals; a driving device connected to the DC power supply and the state configuring device respectively, and outputting a driving voltage according to the waveform signal; a transformer connected to the driving device, transforming the driving voltage to an AC operating voltage; and an alternating current (AC) load connected to the transformer; a feedback circuit connected to the AC load; a power detector connected to the feedback circuit for detecting the output power of the AC load, and optimizing the output power by adjusting the waveform signal outputted by the pulse generator.

Claims

1. A digital power control system, comprising:

a direct current (DC) power supply for said system;

a state configuring device, generating a plurality of state signals each with a corresponding output, wherein each output can individually output said corresponding state signal by selection;

a pulse generator connected to said state configuring device, receiving and converting said state signals of said state configuring device to a plurality of waveform signals;

a driving device connected to said DC power supply and said configuration device, outputting a driving voltage according to said waveform signal from said pulse generator;

a transformer, connected to said driving device, transforming said driving voltage to an AC operating voltage; and

an alternating current (AC) load, connected to said transformer, operating on said AC operating voltage.

2. The digital power control system of claim 1, wherein a plurality of sate resistors, each corresponding to one state signal and connected to a grounded state capacitor at one end, are further connected to said state configuring device at said other end.

3. The digital power control system of claim 2, wherein said state configuring device further comprises:

a state machine, generating a plurality of status signals and having a plurality of outputs, each corresponding to one status signal, wherein each output can selectively output said corresponding status signal;

a switch connected to said outputs of said state machine, further comprising a plurality of ports each connected to a corresponding state resistor, wherein said state capacitors and said state resistors results in a plurality of charging/discharging circuits;

a voltage detecting circuit with the input connected to said state capacitors and said state resistors to detect voltage of said state capacitors, wherein voltage variation of said configuration capacitors determines an output of a state clock signal;

a counter connected to said voltage detecting circuit, counting said state clock signal and outputting a data signal when count of said state clock signal reaches a state value; and

a plurality of state registers each corresponding to said status signals of said state machine and connected to an output of said counter, wherein said state registers output said corresponding state signal according to said data signal received.

4. The digital power control system of claim 3, in between said voltage detecting circuit and said counter of said state configuring device further comprising:

a frequency divider connected to said voltage detecting circuit, enforcing frequency division of said state clock signal with said state value being denominator; and

an edge triggered flip flop connected to said frequency divider, triggered by a edge of a signal from frequency divider output and outputting a status switching signal to said state machine which enables switch of said state machine to its next output;

wherein said counter, connected to an output of said edge triggered flip flop and counting number of said status switching signals and outputting a data signal to each state register.

5. The digital power control system of claim 4, wherein said edge triggered flip flop is a leading edge triggered flip flop.

6. The digital power control system of claim 3, wherein said status signals comprise an overlap signal, a delay signal, a base light signal, a dim frequency signal, and an echo signal.

7. The digital power control system of claim 3, wherein said switch comprises a plurality of three state switches, each corresponding to one status signals, with controlling ports of said three state switches each connected to one corresponding outputs of said state machine at one end and grounded at said other end so as to result in charging/discharging circuits together with each state resistor and state capacitor.

8. The digital power control system of claim 7, wherein said status signals enable said three way switches so that said three way switches conduct during high voltage and turn off during low voltage.

9. The digital power control system of claim 4, wherein said voltage detecting circuit outputs a high voltage signal when the voltage at the input thereof is lower than a first state voltage and outputs a low voltage signal when the voltage at the input thereof is higher than a second state voltage so that series of said high voltage signals and low voltage signals constitute said state clock signal outputting to said frequency divider.

10. The digital power control system of claim 9, wherein said voltage detecting circuit further comprises a charging output connected to said state capacitor and to each state resistor, said charging output charging said state capacitor when voltage at said input of said voltage detecting circuit is smaller than said first state voltage and stopping charging when voltage at said input of said voltage detecting circuit is higher than said second state voltage.

11. The digital power control system of claim 9, wherein said first state voltage is smaller than said second state voltage.

12. The digital power control system of claim 4, wherein manipulation of said state value determines reduction of interference of Gaussian noise.

13. The digital power control system of claim 2, wherein capacitance of said state capacitor and resistance of said state resistor can be configured to meet the requirement of users.

14. The digital power control system of claim 1, further comprising:

a feedback circuit, connected to said AC load; and

a power detector connected to said feedback circuit and said pulse generator to detect operating power of said AC load and send out a power adjusting signal to said pulse generator so that said waveform signals can be altered to adjust power of said AC load.

15. The digital power control of claim 14, wherein said feedback circuit comprises:

a first capacitor with one end connected to said other end of said feedback resistor and said other end grounded;

a third resistor with parallel connection to said first capacitor, wherein said third resistor along with said first capacitor results in a charging/discharge circuit; and

a second capacitor with one end connected to said second resistor and grounded at said other end;

wherein said first capacitor and said feedback resistor share one connection to said power detector.

16. The digital power control system of claim 15, wherein said power detector comprises:

a voltage controlled oscillator, comprising;

a controlling port connected to said feedback resistor and said first capacitor, charging and discharging said charging/discharging circuit resulting from said first capacitor and said third resistor; and

an output, outputting a low voltage signal when voltage at said controlling port is higher than a first power voltage and a high voltage signal when voltage at said controlling port is lower than a second power voltage so that series of high voltage signals and low voltage signals result in a power clock signal;

a frequency divider connected to the output of said voltage controlled oscillator, making frequency division of said power clock signals with a first power factor as a denominator;

an edge triggered flip flop connected at its input to said frequency divider, triggered by edges of signals from said frequency divider and outputting a triggering signal from output thereof;

a counter with an input connected to said output of said edge triggered flip flop so as to count triggering signals and output the count value;

a comparator connected to said output of said counter for comparing count value from said counter with a second power factor so as to output a minus signal when the count value from said counter is larger than said second power factor and a plus signal when the count value from second said counter is smaller than said second power factor; and

a storage device with an input connected to said output of said comparator, generating said power adjusting signal to said pulse generator based on signals from said comparator so that said pulse generator can output said waveform signal according to said power adjusting signal and said state signals.

17. The digital power control system of claim 16, wherein said counter further comprises a power detector with a controlling port connected between said second resistor and said second capacitor of said feedback circuit so that said counter counts while voltage at said controlling port is higher than said second power voltage, and stops counting while voltage at said controlling port is smaller than said second power voltage.

18. The digital power control system of claim 16, wherein said first power voltage is higher than said second power voltage.

19. The digital power control system of claim 16, wherein said first power factor is dependent on period of power detection.

20. The digital power control system of claim 16, wherein said second power factor is dependent on a default load current and resistance of said feedback resistor.

21. The digital power control system of claim 14, further comprising a signal converter with an input receiving an analog dimming signal and converting said analog dimming signal to an digital dimming signal to output to said pulse generator so that said pulse generator can generate said waveform signal according to said digital dimming signal and said state signal.

22. The digital power control system of claim 21, further comprising an open/short circuit protector with a plurality of inputs connected to said signal converter and said power detector, wherein said open/short circuit protector receives an pulse width modulated signal and a turn-on/off signal, outputting a protecting signal to disable said driving device and to stop said power detector from sending power adjusting signal under one and one of the combination of the following conditions when said analog dimming signal completely dims brightness, when said pulse width modulated signal completely dims brightness, when said turn-on/off signal is off, and when load of said power detector is open or short circuited.

23. The digital power control system of claim 14, wherein said state configuring device, said pulse generator, and said power detector can be integrated into a driving microcontroller chip.

24. The digital power control system of claim 6, wherein said driving device comprises:

a first PMOS FET with the source connected to said DC power and the drain to a first node;

a second PMOS FET with the source connected to DC power and the drain to a second node;

a first NMOS FET with the drain connected to said second node and the source grounded; and

a second NMOS FET with the drain connected to said second node and the source grounded;

wherein said first node and said second node are respectively connected to different ends of said transformer and each gates of MOS FETs are individually connected to said outputs of said pulse generator with each waveform signal dominating conduction of each MOS FETs so as to output said driving output to said transformer.

25. The digital power control system of claim 24, wherein said waveform signals further comprises a first waveform signal, a second waveform signal, a third waveform signal, and a fourth waveform signal respectively connected to said first PMOS FET, said second PMOS FET, said first NMOS FET, and said second NMOS FET in order to control the conduction of MOS FETs.

26. The digital power control system of claim 25, wherein period of said driving device is twice of that of said status signals.

27. The digital power control system of claim 26, wherein said first, second, third, and fourth waveform signals are at high voltage when said status signal is at a first overlap status.

28. The digital power control system of claim 26, wherein said first waveform signal is at high voltage;

said second waveform signal is at high voltage;

said third waveform signal is at high voltage, and said fourth waveform signal is at low voltage when said status signal is at a first delay status.

29. The digital power control system of claim 26, wherein said first waveform signal is at low voltage;

said second waveform signal is at high voltage;

said third waveform signal is at high voltage, and said fourth waveform signal is at low voltage when said status signal is at a first base light and a first dim frequency status.

30. The digital power control system of claim 26, wherein said first waveform signal is at high voltage;

said second waveform signal is at high voltage;

said third waveform signal is at high voltage, and said fourth waveform signal is at low voltage when said status signal is at a first echo status.

31. The digital power control system of claim 26, wherein said first waveform signal is at high voltage;

said second waveform signal is at high voltage;

said third waveform signal is at high voltage, and said fourth waveform signal is at high voltage when said status signal is at a second overlap status.

32. The digital power control system of claim 26, wherein said first waveform signal is at high voltage;

said second waveform signal is at low voltage;

said third waveform signal is at high voltage, and said fourth waveform signal is at low voltage when said status signal is at a second delay status.

33. The digital power control system of claim 26, wherein said first waveform signal is at high voltage;

said second waveform signal is at low voltage;

said third waveform signal is at low voltage, and said fourth waveform signal is at high voltage when said status signal is at a second base light and a second dim frequency status.

34. The digital power control system of claim 26, wherein said first waveform signal is at high voltage;

said second waveform signal is at low voltage;

said third waveform signal is at low voltage, and said fourth waveform signal is at high voltage when said status signal is at a second echo status.

35. The digital power control system of claim 24, wherein said driving device further comprises:

a Not gate, receiving a protecting signal at the input thereof and outputting a inversed signal at the output thereof;

a first AND gate with the input thereof connected to an output of said first waveform signal of said pulse generator and said output of said Not gate respectively, and the output thereof connected to said gate of said first PMOS FET;

a second AND gate with the input thereof connected to an output of said second waveform signal of said pulse generator and said output of said Not gate respectively, and the output thereof connected to said gate of said second PMOS FET;

a first OR gate with the input thereof connected to an output of said third waveform signal of said pulse generator and said output of said Not gate respectively, and the output thereof connected to said gate of said first NMOS FET; and

a second OR gate with the input thereof connected to an output of said fourth waveform signal of said pulse generator and said output of said Not gate respectively, and the output thereof connected to said gate of said first NMOS FET;

wherein each logic gate disables said MOS FETs of said driving device according to said protecting signals.