Charger system for battery starting current test

• US 9,977,089 B2
• Filed: 11/21/2014
• Issued: 05/22/2018
• Est. Priority Date: 11/19/2014
• Status: Active Grant

• Current Assignee: New Focus Lighting and Power Technology Company Limited
• Original Assignee: New Focus Lighting and Power Technology Company Limited
• Inventors: Liu, Yu, Gong, Shiquan, Zhang, Jianxing
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): OMAR, AHMED H
• Application Number:
  US15/308,809
• Publication Number:
  US 20170248658A1
• Time in Patent Office: 1,278 Days
• Field of Search: 320162
• CPC Class Codes: G01R 31/006 on road vehicles, e.g. automobiles or trucks testing of ignition installations peculiar to internal combustion engines F02P17/00
• CPC Class Codes: G01R 31/386 using test-loads
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 10/446 Initial charging measures
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A charger system for battery starting current test, comprising: a battery equivalent circuit comprising a battery internal resistance R0 and an electromotive force E connected in series, two ends of the battery equivalent circuit are connected to a first signal and a second signal, respectively; a signal drive circuit, comprising a first DC output signal and a second DC output signal, and a first load circuit and a second load circuit configured between the first DC output signal and the second DC output signal, each load circuit is connected to the battery equivalent circuit and controlled by a first drive signal and a second drive signal; an intermediate resistor R28, configured between the signal drive circuit and the battery equivalent circuit. This invention uses the above technical solution to test the internal resistance of the battery, and find out the CCA value of the battery via the internal resistance correspondingly.

Claims

1. A charger system for testing battery starting current, comprising:

a battery equivalent circuit, comprising a battery internal resistance R0 and an electromotive force E connected in series, and two ends of the battery equivalent circuit are connected to a first signal (signal +) and a second signal (signal −

) respectively;

a signal drive circuit, comprising a first DC output signal and a second DC output signal, and a first load circuit and a second load circuit being configured between the first DC output signal and the second DC output signal, each of the load circuits is connected to the battery equivalent circuit and controlled by a first drive signal (drive signal 1) and a second drive signal (drive signal 2) respectively; and

an intermediate resistor R28, configured between the signal drive circuit and the battery equivalent circuit;

wherein the first DC output signal and the first signal (signal +) are connected to a positive electrode of the battery, and the second DC output signal and the second signal (signal −

) are connected to a negative electrode of the battery.

2. The charger system according to claim 1, wherein in the first load circuit,

the first drive signal is connected to a base electrode of a first triode (Q3), an emitter electrode of the first triode (Q3) is grounded, and a collector electrode thereof is connected to a control terminal of a first switching tube (Q1);

a first resistor module is configured between the first DC output signal (DC output +) and the first switching tube (Q1); and

the source of the first switching tube (Q1) is connected to the second DC output signal (DC output −

).

3. The charger system according to claim 2, wherein a resistor (R21) is configured between the base electrode of the first triode (Q3) and the first drive signal, and also two resistors (R10, R19) are connected in series between the collector electrode of the first triode (Q3) and the first drive signal, a node between the two resistors is connected to a supply voltage VCC, the emitter electrode of the first triode (Q3) is grounded, and a resistor (R6) is also configured between the first triode (Q3) and the first switching tube (Q1);

a reverse blocking diode (D1) is configured between the first DC output signal and the first resistor module; and

the first resistor module comprises a plurality of resistors (R6, R7, R8) connected in parallel.

4. The charger system according to claim 1, wherein in the second load circuit,

the second drive signal is connected to a base electrode of a second triode (Q4), an emitter electrode of the second triode is grounded, and a collector electrode thereof is connected to the control terminal of a second switching tube (Q2);

a second resistor module (R9) is configured between the first DC output signal (DC output +) and the second switching tube (Q2); and

a source of the second switching tube (Q2) is connected to the second DC output signal (DC output −

).

5. The charger system according to claim 4, wherein a resistor (R24) is configured between the base electrode of the second triode (Q4) and the second drive signal, and also two resistors (R22, R23) are connected in series between the collector electrode of the second triode (Q4) and the second drive signal, the node between the two resistors is connected to a supply voltage VCC, the emitter electrode of the second triode (Q4) is grounded, a resistor (R2) is also configured between the second triode (Q4) and the second switching tube (Q2);

a reverse blocking diode (D2) is configured between the first DC output signal and the second resistor module (R9).

6. The charger system according to claim 2, wherein in the first load circuit, the voltage difference between the first signal (signal +) and the second signal (signal −

) is U1, and the resistance value of the first resistor module is R_m1;

7. The charger system according to claim 4, wherein in the first load circuit, the voltage difference between the first signal (signal +) and the second signal (signal −

) is U1, and the resistance value of the first resistor module is R_m1;

8. The charger system according to claim 1, wherein the system further comprises a signal amplifying circuit;

the first signal (signal +) is connected to a positive phase input terminal of a first voltage follower (U1A) via a capacitor (C1), and the second signal (signal −

) is connected to the positive phase input terminal of a second voltage follower (U1D) via a capacitor (C2);

between the first signal (signal +) and the first voltage follower (U1A), and between the second signal (signal −

) and the second voltage follower (U1D), and a bleeder circuit is provided to provide DC bias;

an output end of the first voltage follower (U1A) and an output end of the second voltage follower (U1D) are connected to two input ends of a subtracter (U1B) respectively, to amplify signal, and an output end of the subtracter (U1B) is connected to the positive phase input terminal of an amplifier (U1C), to further amplify signal output from the subtracter (U1B).

9. The charger system according to claim 8, wherein the bleeder circuit configured between the first signal (signal +) and the first voltage follower (U1A) comprises:

two resistors connected in series between a supply voltage VCC and a ground terminal GND;

the bleeder circuit configured between the second signal (signal −

) and the second voltage follower (U1D) comprises;

two resistors (R18, R17) connected in series between a supply voltage VCC and a ground terminal GND, and a resistor (R16) is connected in parallel with the resistor (R17) connected to the ground terminal.

10. The charger system according to claim 8, wherein output ends of the first voltage follower (U1A), the second voltage follower (U1D), the subtracter (U1B) and the amplifier (U1C) all provide feedback signal to their respective inverting input ends.

11. The charger system according to claim 1, wherein current passing through the first DC output signal and the second DC output signal is greater than current passing through the first signal (signal +) and the second signal (signal −

).

12. The charger system according to claim 1, wherein further comprises a regulated power supply circuit, converting the first DC output signal and the second DC output signal through a Zener diode (VR1), and providing a stable voltage reference source VREF.

13. The charger system according to claim 12, wherein in the regulated power supply circuit, the first DC output signal is connected to a linear regulator (U2) via a diode (D3), and a capacitor (C3) is configured between the input end of the linear regulator (U2) and the ground terminal, and a capacitor (C4) is configured between the output end of the linear regulator (U2) and the ground terminal.