CHARGER AUTOMATICALLY TRACKING AN OPTIMAL CHARGING FREQUENCY FOR SINUSOIDAL WAVE BATTERIES

• US 20120268060A1
• Filed: 04/20/2011
• Published: 10/25/2012
• Est. Priority Date: 11/23/2010
• Status: Active Grant

• Current Assignee: National Changhua University Of Education
• Original Assignee: National Changhua University Of Education
• Inventors: Chen, Liang-Rui
• Granted Patent: US 8,829,859 B2
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H02J 7/00711 with introduction of pulses during the charging process
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A device and a method automatically trace and fix a resonance frequency of the batteries for offering an optimal charging frequency to the batteries. The device and method utilize a resonance frequency f_r that charges batteries with a sinusoidal wave, automatic tracing function, and a fixed current. While the resonance frequency f_r is adopted in a charging device and served as the optimum charging frequency, the using life of the batteries could be extended.

Claims

1. A method for charging batteries comprising a Sinusoidal Wave that is formed by at least either a charging voltage wave or a charging current wave at the same time.

3. The method as claimed in claim 1, a charging frequency is changed according to a charging state of said batteries.

4. The method as claimed in claim 1, a charging frequency adopts a resonance frequency of an AC Impedance of said batteries.

5. The method as claimed in claim 1, a charging frequency adopts a frequency suited to a lowest AC Impedance of said batteries.

2. A method for charging batteries comprising a Sinusoidal Wave with a DC offset formed by at least either a charging voltage wave or a charging current wave at the same time.

21. The method as claimed in claim 2, a charging frequency is changed according to a charging state of said batteries.

22. The method as claimed in claim 2, a charging frequency adopts a resonance frequency of an AC Impedance of said batteries.

23. The method as claimed in claim 2, a charging frequency adopts a frequency suited to a lowest AC Impedance of said batteries.

6. A device for charging batteries at least comprising a controllable sinusoidal power for outputting sinusoidal wave voltages or sinusoidal wave currents of different frequencies so as to charge said batteries.

7. A device for charging batteries at least comprising a phase comparator for determining a charging frequency of said batteries.

8. A device for charging batteries at least comprising a controllable sinusoidal wave power, a small-signal voltage detecting circuit, and a phase comparator;

wherein,

said controllable sinusoidal wave power receiving an output phase contrast signal of said phase comparator for changing an output frequency of said sinusoidal wave power until said output phase contrast signal of said phase comparator equals to zero or a determined value;

said small-signal voltage detecting circuit measuring a charging voltage of said batteries and filtering out a DC part thereof for attaining a small-signal voltage signal, so that said small-signal voltage signal is simultaneously amplified and transmitted to said phase comparator; and

said phase comparator receiving a current phase signal from said controllable sinusoidal wave power and a voltage phase signal from said small-signal voltage detecting circuit for comparing a phase contrast therebetween and transmitting a comparing result to said controllable sinusoidal wave power.

9. The device as claimed in claim 8, said controllable sinusoidal wave power at least comprises a voltage-controlled oscillator and a voltage-to-current converter for outputting sinusoidal wave currents of different frequencies.

10. The device as claimed in claim 8, said controllable sinusoidal wave power at least comprises a low pass filter, a voltage-controlled oscillator, an amplifier, a clamp circuit, and a voltage-to-current converter for outputting sinusoidal wave currents of different frequencies and different DC offsets.

11. The device as claimed in claim 8, said small-signal voltage detecting circuit at least comprises a high pass filter and an amplifier.

12. A device for charging batteries comprising a controllable sinusoidal wave power, a small-signal current detecting circuit, and a phase comparator;

wherein,

said controllable sinusoidal wave power receiving an output phase contrast signal of said phase comparator for changing an output frequency of said sinusoidal wave power until said output phase contrast signal of said phase comparator equals to zero or a determined value;

said small-signal current detecting circuit measuring a charging current of said batteries and filtering out a DC part thereof for attaining a small-signal current signal, so that said small-signal current signal is simultaneously amplified and transmitted to said phase comparator; and

said phase comparator receiving a voltage phase signal from said controllable sinusoidal wave power and a current phase signal from said small-signal current detecting circuit for comparing a phase contrast therebetween and transmitting a comparing result to said controllable sinusoidal wave power.

13. The device as claimed in claim 12, said controllable sinusoidal wave power at least comprises a voltage-controlled oscillator for outputting sinusoidal wave voltages of different frequencies.

14. The device as claimed in claim 12, said controllable sinusoidal wave power at least comprises a low pass filter, a voltage-controlled oscillator, an amplifier, and a clamp circuit for outputting sinusoidal wave voltages of different frequencies and different DC offsets.

15. The device as claimed in claim 12, said small-signal current detecting circuit at least comprises a high pass filter and an amplifier.

16. A device for charging batteries at least comprising a controllable sinusoidal wave power, a small-signal current detecting circuit, a small-signal voltage detecting circuit, and a phase comparator;

wherein,

said controllable sinusoidal wave power receiving an output phase contrast signal of said phase comparator for changing an output frequency of said sinusoidal wave power until said output phase contrast signal of said phase comparator equals to zero or a determined value;

said small-signal current detecting circuit measuring a charging current of said batteries and filtering out a DC part thereof for attaining a small-signal current signal, so that said small-signal current signal is simultaneously amplified and transmitted to said phase comparator;

said small-signal voltage detecting circuit measuring a charging voltage of said batteries and filtering out a DC part thereof for attaining a small-signal voltage signal, so that said small-signal voltage signal is simultaneously amplified and transmitted to said phase comparator; and

said phase comparator receiving a voltage phase signal from said small-signal voltage detecting circuit and a current phase signal from said small-signal current detecting circuit for comparing a phase contrast therebetween and simultaneously transmitting a comparing result to said controllable sinusoidal wave power.

17. The device as claimed in claim 16, said controllable sinusoidal wave power at least comprises a voltage-controlled oscillator for outputting sinusoidal wave voltages and currents of different frequencies.

18. The device as claimed in claim 16, said controllable sinusoidal wave power at least comprises a low pass filter, a voltage-controlled oscillator, an amplifier, a clamp circuit, and a voltage-to-current converter for outputting sinusoidal wave voltages and currents of different frequencies and different DC offsets.

19. The device as claimed in claim 16, said small-signal current detecting circuit at least comprises a high pass filter and an amplifier.

20. The device as claimed in claim 16, said small-signal voltage detecting circuit at least comprises a high pass filter and an amplifier.