Intelligent equalizing battery charger having equalization charging circuitry

• US 7,583,056 B2
• Filed: 12/23/2005
• Issued: 09/01/2009
• Est. Priority Date: 11/09/2005
• Status: Expired due to Fees

• Current Assignee: Sino-American Electronics Co., Ltd.
• Original Assignee: Sino-American Electronics Co., Ltd.
• Inventors: Huang, Jeffrey, Chiang, Ray, Lu, Kelvin
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US11/315,362
• Publication Number:
  US 20070145946A1
• Time in Patent Office: 1,348 Days
• Field of Search: 320/107, 320/116, 320/118, 320/119
• US Class Current: 320/118
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control

Abstract

An intelligent equalizing battery charger having equalization charging circuitry is disclosed, comprising an insulating switch-type DC to DC converting circuit, a microprocessor monitoring/calculating control circuit, and a charging battery set wherein the insulating switch-type DC to DC converting circuit is composed of a power supply switch circuit, an insulating transformer, and a rectification converting circuit. The microprocessor monitoring/calculating control circuit includes multiple switch elements and a charging control microprocessor. Via the aforementioned structure, each individual cell of the charging battery set can be appropriately charged in equalization, which can not only increase the charging/discharging times of the battery set, but also efficiently extend the battery life in application.

Claims

1. An intelligent equalizing battery charger having equalization charging circuitry, composed of a set of insulating-type DC to DC converter to supply power source for the charging thereof, and a set of microprocessor control circuitry to monitor the state of a battery set stringed in series and to calculate for control of the charging state of each individual cell of the battery set wherein the equalization charging circuitry includes a set of insulating switch-type DC to DC converting circuit, a set of microprocessor monitoring/calculating control circuit, and a charging battery set,

wherein the insulating switch-type DC to DC converting circuit includes a power supply switch circuit, an insulating transformer, and a rectification converting circuit,

wherein the power supply switch circuit is a MOS or a SSR.

2. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 1 wherein the insulating transformer of the switch-type DC to DC converting circuit is composed of a primary coil set, an inductive magnetic-flux-release coil set linked to the primary coil, and a center-tapped type secondary coil set;

the DC power supply is conducted through the power supply switch circuit linked to the primary coil set thereof and converted across the center-tapped type windings of the secondary coil thereof to pass through the rectification converting circuit respectively and feed the corresponding cell of the charging battery set stringed in series.

3. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 1 wherein the power supply switch circuit linked to the primary coil thereof has a filtering capacitor connected thereto for rectifying the DC power supply, and a switch having the function of switching on/off;

the rectification converting circuit linked to the secondary coil thereof has a rectifying diode, a freewheeling diode, a coupling inductor, and a filtering capacitor connected thereto.

4. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 3 wherein the switch of the power supply switch circuit linked to the primary coil thereof is switched on for conduction, permitting the DC power supply to pass through the filtering capacitor before converted through the insulating transformer to feed the rectification converting circuit linked to the secondary coil thereof;

then the power supply will flow through the rectifying diode, the coupling inductor, and the filtering capacitor to provide the DC power supply required for the microprocessor monitoring/calculating control circuit thereby;

when the switch linked to the primary coil is blocked from the power supply, the coupling inductor linked to the secondary coil thereof will feed the power supply to the filtering capacitor via the freewheeling diode, and the primary coil set thereof will start to release the magnetic flux of the transformer via a fast diode.

5. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 1 wherein the power supply switch circuit linked the primary coil set includes a filtering capacitor for rectifying the DC power supply, two switches having the function of switching on/off, and two fast diodes that are respectively matched to the rectification converting circuit corresponding to the battery set thereof;

the rectification converting circuit linked to the secondary coil thereof has a rectifying diode, a freewheeling diode, a coupling inductor, and a filtering capacitor connected thereto.

6. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 5 wherein the switches of the power supply switch circuit linked to the primary coil thereof are simultaneously switched on for conduction, permitting the DC power supply to pass through the filtering capacitor before converted through the insulating transformer to feed the rectification converting circuit linked to the secondary coil thereof;

then, the power supply will flow through the rectifying diode, the coupling inductor, and the filtering capacitor to provide the DC power required for the microprocessor monitoring/calculating control circuit thereby;

when the switches at the primary side are blocked from the power supply, the coupling inductor linked to the secondary coil thereof will provide the power to the filtering capacitor through the freewheeling diode, and the primary coil set thereof will start to release the magnetic-flux of the transformer via the fast diodes thereof.

7. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 1 wherein the power supply switch circuit linked to the primary coil has a filtering capacitor for rectifying the DC power supply and a switch having the function of switching on/off that are matched to the rectification converting circuit corresponding to the battery set thereof;

the rectification converting circuit linked to the secondary coil thereof has a rectifying diode and a filtering capacitor.

8. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 7 wherein the switch linked to the primary coil thereof is switched on for conduction, permitting the DC power supply to pass through the filtering capacitor before converted through the insulating transformer to feed the rectification converting circuit linked to the secondary coil thereof;

then, the power supply will flow through the rectifying diode and the filtering capacitor to provide the DC power supply required for the microprocessor monitoring/calculating control circuit thereby;

when the switch linked to the primary coil is blocked from the power supply, the secondary coil thereof will provide the power supply to the filtering capacitor thereof.

9. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 1 wherein the power supply switch circuit linked to the primary coil thereof has a filtering capacitor for rectifying the DC power supply, two switches having the function of switching on/off, two fast diodes, and a resonant capacitor that are respectively matched to the rectification converting circuit corresponding to the battery set thereof;

the rectification converting circuit linked to the secondary coil thereof has two rectifying diodes, a coupling inductor, and a filtering capacitor.

10. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 9 wherein the switches linked to the primary coil thereof are simultaneously switched on for conduction, permitting the DC power supply to pass through the filtering capacitor before converted through the insulating transformer to feed the rectification converting circuit linked to the secondary coil thereof;

then, the power supply will flow through one rectifying diode, the coupling inductor, and the filtering capacitor to provide the DC power supply required for the microprocessor monitoring/calculating control circuit thereby;

when the switches linked to the primary coil thereof are blocked from the power supply, the coupling inductor linked to the secondary coil thereof will provide the power supply to the filtering capacitor through another rectifying diode, and the primary coil set thereof will start to release the magnetic-flux of the transformer via the fast diodes thereof;

the resonant capacitor is set to maintain the volt-sec balance of the insulating transformer thereby.

11. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 1 wherein the microprocessor monitoring/calculating control circuit is composed of multiple switch elements and a charging control microprocessor that are cooperatively matched to the charging battery set thereof.

12. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 11 wherein the switch elements thereof are composed of transistors.

13. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 11 wherein the switch elements thereof are composed of MOS.

14. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 11 wherein the switch elements thereof are composed of SSR.

15. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 11 wherein the switch elements of the micro-processing monitoring/calculating control circuit are augmented to correspondingly match to the cell number of the charging battery set thereby.

16. The intelligent equalizing battery charger having equalization charging circuitry as claimed in claim 2 wherein the center-tapped type windings of the secondary coil of the insulating transformer, and the rectification converting circuit is augmented to match to the cell number of the charging battery set thereby.