JP2012220391A - High-accuracy tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-accuracy battery tester.SOLUTION: The present invention discloses a high-accuracy battery tester, and the tester comprises: a casing provided with an inputting device and two detecting wires; a microprocessor; a variable load unit; and a battery power state detecting unit. An important determining process is created inside the microprocessor to determine a proper resistance value of load for a battery in accordance with battery capacity, initial voltage, and detection requisites including 1/N CCA and loading time. When the resistance value of the load is determined, the microprocessor adjusts a resistance value of the variable load unit to be equal to the resistance value of the load for the battery. Accordingly, in order to detect a battery having a different capability, the battery tester does not use the load having a fixed resistance value, and thereby produces accurate detection results.

Description

  The present invention relates to a battery tester, and more particularly to a high-accuracy battery tester.

  There are many types of rechargeable batteries on the market that have different capabilities. The battery tester is used to detect the remaining capacity of the rechargeable battery to determine the state of the rechargeable battery. However, to detect different rechargeable batteries, conventional battery testers use only one method and are likely to produce inaccurate test results.

  In general, a conventional battery tester uses a 1/2 cold cranking amperage (hereinafter referred to as CCA) test method to detect the state of a rechargeable battery. This method consists of (a) adding the load to two electrodes of the battery to discharge the battery by connecting a load carrying a current of 1/2 CCA ampere for 15 seconds, and (b) Having the step of determining the state of the battery.

  In the conventional test method implemented by the battery tester, the load resistance and the time for connecting the load resistance to the battery are fixed. Therefore, when the battery tester detects rechargeable batteries having different capabilities, the numerical value of the discharge graph is not accurate. The test accuracy of conventional battery testers is not ideal for all rechargeable batteries.

  In order to overcome the above drawbacks, the present invention provides a high-accuracy battery tester to alleviate or eliminate the above-mentioned problems.

  In view of the above-mentioned drawbacks of the conventional battery tester, the main object of the present invention is to provide a highly accurate battery tester.

The battery tester includes a casing provided with an input device and two detection wires, a microprocessor, a variable load unit, and a battery power state detection unit. The microprocessor performs an important decision process internally to determine the appropriate resistance value of the load for the battery according to the battery capacity, battery voltage, and detection requirements with 1 / N CCA and load time. To construct. Once the resistance value of the load is determined, the microprocessor adjusts the resistance value of the variable load unit equal to the resistance value of the load for the battery. Therefore, the battery tester does not use a load having a fixed resistance value in order to detect batteries having different capacities, and provides an accurate detection result.

  Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

1 is a perspective view of a battery tester according to the present invention. It is a functional block diagram of the battery tester according to the present invention. 2 is a flowchart of an important decision process performed by the tester shown in FIG. 1 is a circuit diagram of a first embodiment of a variable load unit of a battery tester according to the present invention. It is a circuit diagram of the 2nd example of a variable load unit of a battery tester concerning the present invention. It is a circuit diagram of the 3rd Example of the variable load unit of the battery tester which concerns on this invention. It is a circuit diagram of the 4th example of the variable load unit of the battery tester concerning the present invention. 6 is a flowchart of an important determination process of the first detection mode shown in FIGS. 5A, 5B and 5C according to the present invention. It is a test | inspection graph of the battery tester which concerns on this invention. 3 is a flowchart of a detection process according to the present invention.

  Referring to FIGS. 1 and 2, the first embodiment of the high-accuracy battery tester according to the present invention includes a casing 10, a microprocessor 20, a load unit 21, a switch 211, and a battery power state detection unit 22.

  The casing 10 is provided with an input device 11 and two detection wires 12. The user selects a specific battery capacity using the input device 11. The detection wires 112 are electronically connected to the two electrodes 31 of the battery 30, respectively. In the first embodiment, the two detection wires 12 sandwich the two electrodes 31 of the battery 30, respectively. The casing 10 is further provided with a display 13, a computer connector 14 and an alarm 15. The computer connector 14 is used to connect an external electronic device such as a computer or a mobile phone.

  Microprocessor 20 builds an important decision process and detection process within it.

  The variable load unit 21 is connected to the microprocessor 20 and the battery 30 in order to detect changes in the voltage and current of the battery 30, and as a result, reacts to the microprocessor 20 with both values of the voltage and current.

  The battery power state detection unit 22 is connected between the detection electric wire 12 and the microprocessor 20 in order to detect the battery voltage value and / or current value. Further, the battery power state detection unit 22 can be built in the microprocessor 20.

Further, referring to FIG. 3, the important decision process comprises the following steps:
(A) Battery capacity (CCA _B ) from the input device 11, battery voltage (V _B ) of the current battery from the battery power state detection unit 22, detection having 1 / N CCA and load time from the input device 11 Obtaining requirements (S10),
(B) calculating the load resistance equation using the battery capacity, the initial voltage and the detection requirement to obtain an appropriate load resistance value for the current battery 30 (S11), and (c) ) Each step of performing a detection process (S12) to obtain a detection curve. Here, the equation is the load resistance value = {V _B / [CCA _B × (1 / N)]}.

  Referring to FIG. 4, the variable load unit 21 includes a variable resistor 21 a and a switch 211. The variable resistor 21 a is electronically connected to the detection wire 12. The variable resistor 21 a is electronically connected to the microprocessor 20. The switch 211 is electronically connected between one of the detection wires 12 and the corresponding end of the variable resistor 21a. The microprocessor 20 adjusts the resistance value of the variable resistor 21a. The microprocessor 20 further controls the switching of the switch 211.

For example, if the user detects the state of the current battery 30 of 12V / 1000 CCA, the user can select 1/2 CCA by the input device 11 to detect the battery 30. As a result, the battery tester microprocessor 20 obtains the detection requirements of CCA _B = 1000 CCA, V _B = 12 V, 1 / NCCA = 1/2 CCA, and calculates the appropriate load resistance value according to the load resistance equation. Calculate and obtain a resistance value of 0.024 ohms. The microprocessor 20 controls to adjust the variable resistor 21a so that the variable resistor 21a is 0.024 ohms. When the detection wire 12 is used to be clipped to the electrode 31 of the battery 30, a variable resistor 21a showing a value of 0.024 ohm is connected to the battery 30.

In another example, if the user detects the state of the current battery 30 of 12V / 900 CCA, the user can select a 1/3 CCA by the input device 11 to detect the battery 30. As a result, the microprocessor 20 of the battery tester obtains the detection requirements of CCA _B = 900 CCA, V _B = 12 V, 1 / NCCA = 1/3 CCA, and calculates an appropriate load resistance value according to the load resistance equation. Calculate and obtain a resistance value of 0.04 ohms. The microprocessor 20 controls to adjust the variable resistor 21a so that the variable resistor 21a is 0.04 ohms. When the detection wire 12 is used to be clipped to the electrode 31 of the battery 30, a variable resistor 21a showing a value of 0.04 ohm is connected to the battery 30.

  According to the two examples, the resistance value of the variable resistor can be changed according to different capabilities of the battery.

  Further, referring to FIG. 5A, another embodiment of the variable load unit 21 includes a plurality of resistors 21b and a switching element 21c. One end of each resistor 21b is electronically connected to one detection wire 12, and the other end of each resistor 21b is electronically connected to the other detection wire 12 via a corresponding switching element 21c. It is connected to the. Each switching element 21 c is electronically connected to the microprocessor 20. The microprocessor 20 determines which one resistor 21b is connected to the two electrodes 31 of the battery 30 or which resistor 21b is electronically connected to the two electrodes 31 of the battery 30 in parallel. In order to determine the switching element, the switching element 21c is driven to be intermittent. When an appropriate load resistance value is determined by the microprocessor 20, the microprocessor 20 drives the switching element such that one or more switching elements 21c are turned on according to the load resistance value. When two or more switching elements 21c are driven to turn on at the same time, the resistance value of the variable load unit becomes smaller than the value of one resistor 21b.

  Referring to FIG. 5C, another embodiment of the variable load unit includes a programmable variable resistor 21e and a switch 211. The programmable variable resistor 21e is electronically connected to the detection wire 12. The control end of the programmable variable resistor 21e is connected to the microprocessor 20. Microprocessor 20 directly adjusts the resistance value of programmable variable resistor 21e and determines whether switch 211 is connected to battery 30 to determine whether programmable variable resistor 21e is connected to battery 30 or not. The switch is driven to be intermittent. Further, the microprocessor 20 is connected to the control end of a programmable variable resistor 21e via a buffer 21f.

  For example, if resistor 21b has a resistance value similar to that shown in FIG. 5A and the resistance value is 0.08 ohm, one battery of 12V / 750CCA is detected by a battery tester as shown in FIG. 5A Is done. The user uses the input device 11 to enter the test process and selects 1/2 CCA and a 15 second load time.

Since the resistor 21b has the same resistance value, when the microprocessor 20 is driven to turn on one switch 21c, the load of the battery becomes 0.08 ohm. The microprocessor 20 causes the power state detection unit 22 to detect the current value of the current battery 30 at 0.08 ohms. When the current value is equal to 100A, the microprocessor 20 calculates an appropriate load resistance value, and the calculation process has the following steps.
(A) Expect a number of resistors having 0.08 ohms. Here, [750 × (1/2)] / 100 = 3.75.
(B) Calculate the total detection power in 1/2 CCA and 15 seconds. Here, the entire detection power is [750 × (1/2)] × 15 = 5625 (A seconds).

  Since the microprocessor 20 simply selects the three resistors 21b to connect to the battery 30 in parallel, the initial detection requirements entered by the user are changed. The new load time is changed to 18.75 seconds, as calculated by the equation 5625/300 = 18.75 seconds.

  In this example, the microprocessor 20 turns on the three switches 21c, and the three resistors 21b are electronically connected in parallel with the battery 30 for 18.75 seconds.

5B, another embodiment of the variable load unit includes a plurality of resistors 21b connected in series and a 1 to X multiplexer (selection circuit) 21d. has _{S X} from one common terminal COM and the switching terminal _{S 1.} X is the number of resistors 21b. One end A of the series of resistors is connected to one detection electric wire 12, and the other detection electric wire 12 is connected to the common terminal COM of the multiplexer 21d. S _X from the switching terminal S ₁ of the multiplexer 21d are respectively connected to the other end B of the series node and the series of resistors 21b of the series resistor 21b. To determine the resistance value of the variable load units, microprocessor 20 in order to connect one of the S _X from switching terminal S _1, drives the common terminal COM.

  For example, the resistors 21b have the same resistance value (0.08 ohm), and a 12V / 1000 CCA battery is detected. The user selects 1/2 CCA and a 15 second load time to detect the state of the battery 30.

Since the variable load unit has a plurality of resistors 21b, by moving the multiplexer 21d, first, one resistor 21b is connected to the battery 30 and the current value reaches 12 / 0.08 = 150A. Detect if. If the current value achieves 150 A, the microprocessor 20 further calculates an appropriate load for the current battery 30. The calculation process has the following steps:
(A) 1000/2 × 15 = 7500 (A second) and (b) 7500/150 = 50 (second)

When the microprocessor 20 executes the load process, the microprocessor 20 drives the multiplexer 21d, and the common terminal COM is connected to the _first switching terminal S1. One resistor 21b is selected for connection to the battery 30 via the detection wire 12. Furthermore, the initial load time (15 seconds) is changed to 50 seconds as a new load time.

As another example, in order to detect another battery 30 having 12V / 100CCA, the microprocessor 20 drives the multiplexer 21d and detects the current value (12V / 0.24 = 50A). To connect to 30, three resistors 21b are selected. Depending on the current value, the microprocessor 20 calculates an appropriate load resistance value. The calculation method includes the following steps.
(A) 100/2 × 15 = 750 (A) and (b) 750/50 = 15 (seconds) Here, the fixed load time is equal to the initial load time selected by the user. Therefore, the load time is not changed.

When the microprocessor 20 executes the load process, the microprocessor 20 drives the multiplexer 21d, and the common terminal COM is connected to the _third switching terminal S3. The series of three resistors 21 b are selected for connection to the battery 30 via the detection wire 12 in order to detect deterioration of the battery 30.

According to the description of the two embodiments shown in FIGS. 5A and 5B, the important decision process of the microprocessor 20 comprises the following steps:
(A) obtaining the capacity (CCA _B ), the voltage (V _B ) and the input detection requirements from the input device (S20);
(B) Add at least one resistor 21b connected to the battery 30 by driving one of the switches 21c or the multiplexer 21d in order to detect an appropriate current value (S21).
(C) In order to adjust the resistance value of the variable load unit, an appropriate load resistance value is calculated according to an appropriate current value (S22). Here, the calculation formula of the resistance value is: resistance value = [CCA _{B × (1 / N)]} / I is _B,
(D) calculating an equation for calculating an overall detection time using the initial test information including 1 / N CCA and load time (T _LOAD ) (S23), where the overall detection time is calculated; The equation to do is: Total detection time = [CCA _B × (1 / N)] × T _LOAD
(E) changing the initial load time according to the number of resistors selected by the microprocessor (S24); and (f) performing a detection process to obtain a detection curve (S25); It is.

  According to the above, the variable load unit 21 has a plurality of resistors 21b, but the microprocessor 20 adjusts the number of resistors 21b and changes the initial load time selected by the user. , Perform the important decision process. Thus, the microprocessor 20 obtains an accurate detection curve for the battery 30 regardless of the battery 30 of different capabilities.

  Referring to FIGS. 1, 7 and 8, a detection curve obtained by the microprocessor 20 and a flowchart of the detection process are shown. In the detection process, the battery 30 is first charged to full capacity and immediately removed from the charger. Next, the variable load unit 21 is connected to the battery 30. The microprocessor 20 detects the discharge power of the battery 30 through the variable load unit 21 and monitors whether or not the discharge power of the battery 30 becomes the valley (Ve2) of the current power value. Until the discharge power reaches the current power value (Ve2), the switch 21c disconnects the battery, so that the variable load unit 21 is disconnected from the battery (S40). Therefore, the battery 30 does not have any floating charging voltage. Next, in order to detect a plurality of voltage values and current values of the battery 30, the variable unit 21 is selectively connected to the battery 30 (S41). Finally, the detection curve is completed according to the voltage value and / or current value, and the microprocessor determines the battery status according to the detection curve (S42).

  Although many features and advantages of the present invention have been described in the foregoing description, together with details of the structure and operation of the invention, the disclosure is illustrative only. Changes may be made in the details, particularly in the principles of the invention to the full extent indicated by the broad general meaning of the terms of the appended claims, with respect to the shape, size and arrangement of the parts. Can do.

DESCRIPTION OF SYMBOLS 10 Casing 11 Input device 12 Wire for detection 13 Display 14 Computer connector 15 Alarm 20 Microprocessor 21 Variable load unit 21a, 21b Resistor 21c Switching element 21d Multiplexer 22 Battery power state detection unit 30 Battery 31 Battery electrode 211 Switch

Claims (13)

A casing provided with an input device for providing different arbitrary battery capacity and detection requirements and two detection wires respectively connected to the two electrodes of the battery;
A microprocessor that internally builds the critical decision process;
A variable load unit electronically connected to the microprocessor and the detection wire;
A high-accuracy battery tester comprising a battery power state detection unit that is electronically connected to the microprocessor to detect the voltage and current of the battery and transmits the voltage and current to the microprocessor. The variable load unit includes a variable resistor,
The variable resistor is:
Both ends connected to the detection wires,
The high-accuracy battery tester according to claim 1, wherein the microprocessor has one control end electronically connected to the microprocessor so as to adjust a resistance value of the variable resistor. The important decision process is:
(A) obtaining the battery capacity (CCA _B ) and the battery voltage (V _B ) of the current battery and reading the detection requirements with 1 / N CCA and load time;
(B) calculating an equation of load resistance value using the battery capacity, initial voltage and the detection requirement to obtain an appropriate load resistance value for the battery; and (c) a detection curve. The battery of claim 2, comprising steps of performing a detection process to obtain, wherein the equation is: load resistance = {V _B / [CCA _B × (1 / N)]} tester.   The variable load unit includes a plurality of resistors and a plurality of switches electronically connected to the microprocessor, and one end of each resistor is connected to one of the detection wires. The battery tester according to claim 1, wherein the other end is connected to the other detection electric wire via the switch. The variable load unit is:
A series of resistors connected in series, one end of the series of resistors being connected to one of the detection wires;
A multiplexer,
A common terminal connected to the other detection wire;
A plurality of switching terminals respectively connected to the other end of the series of resistors and a series node of the series of resistors;
2. The control terminal of claim 1, wherein the control terminal is electronically connected to the microprocessor and the microprocessor drives the multiplexer to determine which of the switching terminals is connected to the common terminal. Battery tester. The variable load unit is:
A programmable variable resistor having a control end electronically connected to the microprocessor;
The battery tester of claim 1, comprising a switch connected between the programmable variable resistor and the sensing wire and electronically connected to the microprocessor. The variable load unit is:
A programmable variable resistor having both ends respectively connected to the detection wires and a control end electronically connected to the microprocessor;
A buffer electronically connected between the microprocessor and the control end of the programmable variable resistor;
The battery tester of claim 1, comprising a switch connected between one end of the programmable variable resistor and the detection wire and electronically connected to the microprocessor. The important decision process is:
(A) obtaining the input detection requirement having the capacity (CCA _B ), the voltage (V _B ), 1 / N CCA and load time;
(B) adding at least one resistor connected to the battery by driving one of the switches to detect an appropriate current value; (c) the variable load unit according to the appropriate current value; calculating the resistance value, wherein the calculation formula of the resistance value, the resistance value _{= [CCA B × (1 /} N)] / I is _B,
(D) calculating an equation for calculating the overall detection time using initial test information including 1 / N CCA and load time, where the equation for calculating the overall detection time is the overall detection Time = [CCA _B × (1 / N)] × T _LOAD
And (e) changing the initial load time according to the number of resistors selected by the microprocessor, and (f) performing a detection process to obtain a detection curve. Item 5. A battery tester according to Item 4. The important decision process is:
(A) obtaining the input detection requirement having the capacity (CCA _B ), the voltage (V _B ), 1 / N CCA and load time;
(B) adding at least one resistor connected to the battery by driving the multiplexer to connect the common terminal to one of the switching terminals to detect an appropriate current value; c) calculating the resistance value of the load units of the variable in accordance with the proper current value, wherein the calculation formula of the resistance value, the resistance value _{= [CCA B × (1 /} N)] / I is _B,
(D) calculating an equation for calculating the overall detection time using initial test information including 1 / N CCA and load time, where the equation for calculating the overall detection time is the overall detection Time = [CCA _B × (1 / N)] × T _LOAD
And (e) changing the initial load time according to the number of resistors selected by the microprocessor, and (f) performing a detection process to obtain a detection curve. Item 6. The battery tester according to Item 5. The detection process includes:
(A) charging the battery first to full capacity and then immediately removing it from the charger;
(B) connecting the variable load unit to the battery 30 for discharging the battery and monitoring a discharge power state;
(C) disconnecting the variable load unit from the battery until the battery reaches a current discharge power value;
(D) selectively connecting the variable load unit to the battery to detect a plurality of voltage values and current values; and (e) completing the detection curve with the voltage values and current values. The battery tester according to claim 3, comprising: The detection process includes:
(A) charging the battery first to full capacity and then immediately removing it from the charger;
(B) connecting the variable load unit to the battery 30 for discharging the battery and monitoring a discharge power state;
(C) disconnecting the variable load unit from the battery until the battery reaches a current discharge power value;
(D) selectively connecting the variable load unit to the battery to detect a plurality of voltage values and current values; and (e) completing the detection curve with the voltage values and current values. The battery tester according to claim 8, comprising: The detection process includes:
(A) charging the battery first to full capacity and then immediately removing it from the charger;
(B) connecting the variable load unit to the battery 30 for discharging the battery and monitoring a discharge power state;
(C) disconnecting the variable load unit from the battery until the battery reaches a current discharge power value;
(D) selectively connecting the variable load unit to the battery to detect a plurality of voltage values and current values; and (e) completing the detection curve with the voltage values and current values. The battery tester according to claim 9, comprising:   The battery tester according to claim 1, wherein the casing is further provided with a display, a computer connector, and an alarm.

Images