JPH0772226A - Charging battery tester for cordless telephone - Google Patents

Abstract

PURPOSE:To provide a charging battery tester whose portability is excellent and which can measure the charging battery of a cordless telephone and judge the quality of a power-supply adaptor by a simple operation. CONSTITUTION:In whichever way an object to be measured is connected, its polarity is made uniform so as to be always definite by a nonpolarizing circuit 14, and the operability of the title tester is made good. In addition, a nickel- cadmium battery pack to be measured is set to a definite charging state by a charging part 19, it is discharged at a definite current by a constant-current load circuit 17, the time up to a discharge finish voltage is counted by a control part 20, and its life, its quality or the like can be judged/measured simply in a short time. In addition, the constant-current load circuit 17 is connected to a power-supply adaptor to be measured, its quality can be judged by measuring its terminal voltage without charging a load according to its kind. In addition, an ISDM connection can be connected easily by a measuring terminal for modular-jack connection, and the quality of the connection can be judged simply by measuring an interterminal voltage and a polarity by a measuring part 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable battery tester for a cordless telephone, which can easily measure and judge the performance of a rechargeable battery or a power adapter used in a cordless telephone or judge the ISDN connection with good operability. It is about.

[0002]

2. Description of the Related Art A cordless telephone uses a nickel-cadmium battery pack (hereinafter referred to as a nicad battery pack) as a rechargeable power source. Ni-Cd batteries have a predetermined life due to the number of charge / discharge cycles and deterioration over time, and it may be necessary to make a life judgment or a quality judgment. In addition, the quality of the performance of the power supply adapter for charging the nicad battery pack may be a problem. However, there has been no simple measuring device for judging the quality of the NiCd battery pack or the power supply adapter, and a general tester was used to perform the following measurement when necessary.

That is, even if the voltage across the NiCd battery pack is measured with a general battery tester, due to the characteristics of the NiCd battery, as shown in the charging / discharging characteristic diagram of FIG. 12, it takes a long time from the initial discharge to the final discharge. Since it is a constant voltage, the capacitance cannot be measured by measuring the voltage. Therefore, a resistor or the like was connected to the tester and the quality was judged by the degree of the voltage drop. The power adapter generally produces a voltage higher than the indicated voltage at no load. This is because the voltage drop when a rated current is connected as a load is expected.Since the displayed voltage value differs greatly when a load is applied and when there is no load, connect a load such as a resistor to the tester. The terminal voltage was measured with a voltmeter, etc., and the quality was judged.

On the other hand, ISDN (Net 64 line) DS
The bus wiring that is routed from the U (digital line connection device) to the bottom is branched by a modular jack (hereinafter referred to as MJ), and it can be installed in up to 30 locations, so wiring is possible even in one location. If there is a mistake, the terminal connected after that will have a problem, and it may affect the terminal connected before that.
In this case, the search for the defective connection location was performed by opening the lid of the MJ and inspecting each one.

[0005]

However, as described above, in the measurement and judgment of the Nicad battery pack using the general tester and the quality check of the ISDN connection, there are the following problems.

(1) According to the JIS measurement method, after completely discharging the NiCd battery pack, it is fully charged, and the time until the discharge end voltage is reached again under a constant current load is measured to determine the life. . However, this requires a considerable amount of time for the capacitance measurement and cannot be performed simply. Further, in the resistance load, since the voltage is different between the initial stage and the final stage of the discharge, the condition of measuring at a constant current cannot be obtained and accurate measurement cannot be performed. Also, when connecting the NiCd battery pack, the lead terminals are small, which makes it difficult to measure with the lead rod of the tester, and the shape of the terminals and the pin-to-pin size are different for each NiCd battery pack. The measurement terminals could not be shared and workability was poor.

(2) Even in the power adapter, it is difficult to measure with the lead rod of the tester at the pin plug portion. In addition, there are also power adapters in which the telephone line and the power line are shared by the same cord and are modularized.Because the shape and size are different for each power adapter, common measurement terminals cannot be used, Connection was not easy.

(3) When judging whether the performance of the power adapter is good or bad, when a resistance load is connected and the terminal voltage is measured by a voltmeter such as a tester, the output voltage of the power adapter varies depending on the type. In order to correspond to the voltage and the constant output current, it was necessary to change the resistance value each time, and the operation was complicated.

(4) In judging the quality of the ISDN connection, in order to search for a defective connection, it is impossible to find the defective connection without opening the lid of the modular jack and inspecting each one. , Workability was poor, and it took time to repair the breakdown.

The present invention has been made to solve the above problems, and its purpose is to improve portability, life, and performance of a rechargeable battery or power adapter of a cordless telephone with excellent portability. Good or bad measurement or judgment or ISD
An object of the present invention is to provide a rechargeable battery tester for cordless telephones, which can judge the quality of N connection.

[0011]

In order to achieve the above object, in the rechargeable battery tester for a cordless telephone of the present invention, a rechargeable battery for a cordless telephone, a power supply adapter, or a measuring terminal for connecting a modular jack of ISDN connection is provided. , A non-polarizing circuit for making the polarity of the connected charging battery or charging adapter constant, a constant current load circuit for discharging the charging battery or charging adapter with a constant current, and charging the charging battery for a predetermined voltage or for a predetermined time The charging unit and the charging battery having the same polarity or the terminal voltage of the charging battery or the charging adapter are switched to measure with no load or when the constant current load circuit is connected, or IS
A measuring unit that measures the voltage between the terminals of the DN connection and its polarity,
The capacity or the life or the quality of the charging battery or charging adapter is measured or determined based on the measured terminal voltage or the counting time until the terminal voltage drops to a predetermined voltage by the constant current load circuit, or the ISD.
And a control unit that determines whether the ISDN connection is good or bad based on the voltage between the terminals of the N connection and the polarity.

Further, in the above structure, as the measuring terminal to which the power adapter is connected, the center electrode has a diameter that can be inserted into the minimum inner diameter of the terminal of the power adapter, and the external electrode is a spring-like electrode biased toward the center electrode. However, the power adapter connection can be shared, which is suitable for operation.

[0013]

In the rechargeable battery tester for cordless telephones of the present invention, the polarity is always kept constant regardless of how the rechargeable battery to be measured or the power supply adapter is connected by the depolarizing circuit to improve the operability. . In addition, the chargeable battery to be measured is put into a constant charge state by the charging unit, then discharged by a constant current by a constant current load circuit, and the capacity and life of the chargeable battery are shortened easily by counting the time to the discharge end voltage. The quality can be measured or judged. In addition, a constant current load circuit is connected to the power adapter so that a predetermined load current can flow without changing the load even when the output voltage is different, and the terminal voltage is measured to determine whether the workability is good or bad. It is possible. In addition, for ISDN connection, a measuring terminal for modular jack connection is provided to facilitate the connection, and the voltage and polarity between the terminals are specified. Make it possible to judge.

Further, since there are various terminals of the power adapter, the center electrode of the measuring terminal for connecting the power adapter has a diameter that can be inserted into the minimum inner diameter of the power adapter terminal, and the external electrode has a spring shape so that the power adapter has a spring-like shape. By sandwiching the inside and outside of the terminal with the center electrode and the external electrode, one measurement terminal can contact the large and small terminals of the power adapter, and the connection can be shared to facilitate handling.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is an external view of a rechargeable battery tester according to an embodiment of the present invention. In FIG. 1, 1 is a display unit and 2 is an AC
/ DC changeover switch, 3 power switch, 4 measurement start switch, 5 down switch, 6 UP switch, 7 mode changeover switch, 8 for connecting nickel-cadmium battery pack (hereinafter referred to as nicad battery pack) Connector (pin spacing 2 mm), 9 is a Nicad battery pack connection connector (pin spacing 2.54 mm), 10 is a power adapter shared jack, 11 is a power adapter (supplying power to a cordless telephone and charging a built-in battery) ) Is a modular jack 4-pin terminal type (hereinafter referred to as MJ4 type), 12 is a power adapter insertion terminal and modular jack 8-pin terminal type (hereinafter referred to as MJ8 type), and 13 is ISDN For MJ
Reference numerals 8 and 35 are terminals of a tester lead rod for voltage measurement.

The above-mentioned parts have the following functions.
The display unit 1 displays the operation message and the measurement result on the LCD. The AC / DC changeover switch 2 can perform DC measurement on the DC side and AC measurement on the AC side when measuring other voltages. The power switch 3 is a switch for turning the power on and off. Even if the power switch 3 is turned on and left unused for a certain period of time, it is possible to prevent battery consumption by providing a function of automatically turning off the power. The measurement start switch 4 starts the measurement in each mode set in the mode setting by its operation. The DOWN switch 5 selects the measurement value of the item set by the mode setting for the post feed. The UP switch 6 selects the measurement value of the item set by the mode setting in advance. The mode changeover switch 7 has (a) constant current load measurement, (b) capacity measurement, (c)
Power adapter capacity determination, (d) NiCd battery pack charging, (e) AC / DC100V voltage measurement, (f) IS
Set each measurement mode for DN connection quality judgment. The Nicad battery pack connection connector (for 2 mm) 8 has a pin spacing of 2 mm so that it can be adapted to various Nicad battery pack types.
And, we are trying to share. The Nicad battery pack connection connector (for 2.54 mm) 9 has a pin interval of 2.54 mm so that it can be adapted to various Nicad battery pack types.
We are trying to share it. Power adapter shared jack 10
Is trying to make it compatible with various power adapter pin plug connections. Power adapter plug-in terminal (MJ
4 type) 11 is for a power adapter jack in which the telephone line and the power line are shared by the MJ. The telephone line and the power line of the power adapter plug-in terminal (MJ8 type) 12 are MJ
It is for the power adapter jack that is shared with. ISD
The N MJ8 terminal 13 determines the voltage and polarity in the bus wiring portion below the DSU of the ISDN line, and determines whether the connection is good or bad. The tester lead rod terminal 35 is used to measure the AC (alternating current) and DC (direct current) voltage by inserting the tester lead rod.

This device is capable of easily determining the capability of a nickel-cadmium battery pack / power supply adapter used in a cordless telephone, has an internal power supply, and is compact and lightweight in consideration of portability. . For example, the size thereof can be about 140 mm × 205 mm × 45 mm. In the Ni-Cd battery pack, it is possible to determine whether the battery is insufficiently charged, to determine the life due to deterioration over time, and to charge the Ni-Cd battery pack. Furthermore, the power adapter capacity judgment, ISDN connection quality judgment, AC / DC
100V voltage measurement is possible. When checking the quality of a NiCd battery pack, it is connected to the terminal of this device, but since the terminal shape differs depending on the type of NiCd battery pack, by providing two types of terminals, it is possible to connect regardless of the type of NiCd battery pack. Since it has a polarity determination function and a non-polarization function when connecting to a terminal, it is possible to perform load measurement and capacitance measurement on the capacitance without worrying about the polarity. Further, when determining the ability of the power adapter used in the cordless telephone, the ability to easily measure the ability is provided because the receiving side jack of the power adapter is provided in advance and it can be used with various types of jacks. As a result, the battery quality can be determined by a simple operation at the time of breakdown repair and repair brought in at a sales office, etc., and a satisfactory explanation can be given to the customer.

FIG. 2 shows a block diagram of a rechargeable battery tester for a cordless telephone. In FIG. 2, 1 is a display unit, 1
4 is a non-polarizing circuit, 15 is a changeover switch (relay) for charging, 16 is a constant current load switch, 17 is a constant current load circuit, 18 is a measuring unit, 19 is a charging unit, 20 is a control unit, 2
Reference numeral 1 is a power supply unit, 30 is a measurement terminal, and 31 is an operation unit. The display unit 1 is the one shown in FIG. 1, and the measuring terminal 30 is shown in FIG.
8, 9, 10, 11, 12, and 13 of the measuring terminals. In addition, the operation unit 31 includes 4, 5 and
A part including switches 6 and 7 is shown.

The thin solid line in FIG. 2 indicates a connection line related to the NiCd battery pack voltage and other measurement voltages, and the measurement terminal 3
It is connected to the constant current load circuit 17 and the measuring unit 18 from 0 through the depolarizing circuit 14. The connection line coming out of the constant current load circuit 17 is switched to the charging unit 19 side and the constant current load switch (relay) 16 by the charging changeover switch (relay) 15. The control unit 20 is for controlling the respective units in a coordinated and centralized manner in order to perform measurement, determination, and display, and inputs and outputs a control signal indicated by a broken line. That is, upon receiving an operation command from the operation unit 31, the depolarization circuit 1
4, the charging changeover switch 15 and the constant current load switch 16 are controlled, the measurement result is obtained from the measurement unit 18, and the display unit 1
The measurement results and judgment results are displayed on. From the power supply 1
The power supply line indicated by a thick solid line is the display unit 1, the charging unit 19,
Required power is supplied to the control unit 20 and the constant current load circuit 21.

With the above configuration, in order to judge whether the NiCd battery pack has reached the charge shortage and the discharge end voltage,
First, the measurement terminal 30 is connected using the Nicad battery pack connecting connector 8 (for pin spacing of 2 mm) or the Nicad battery pack connecting connector 9 (for pin spacing of 2.5 mm). This makes it easy to connect the Ni-Cd battery pack of the cordless phones currently on the market. Next, set the measurement mode with the mode selector switch 7 of the operation unit 31,
When the measurement start switch 4 is operated, the control unit 20 issues a control command corresponding to the mode setting, the voltage direction of the NiCd battery pack is detected by the measurement unit 18, and a current reverse to the predetermined voltage direction is input. Then, the depolarization circuit 14 switches to a predetermined current direction, the constant current load switch 16 is operated, the constant current load circuit 17 obtains a constant current, and the measuring unit 18 initializes the nicad battery pack. The voltage value is stored in the control unit 20, and is compared with the voltage value after the measurement time set in advance by the control unit 20, and the result of the display unit 1 is judged by the degree of the voltage drop or the discharge end voltage. And the voltage value is displayed. As described above, it is possible to easily determine the charge state of the nickel-cadmium battery pack and whether the battery pack is good or bad.

When a load is applied to the nickel-cadmium battery, as shown in the charge / discharge characteristic diagram of FIG. 12, a gradual drop in voltage is recognized with the passage of discharge time. Therefore, the increase in the internal resistance of the battery is proportional to the amount of discharge of the battery.If the battery is discharged with a relatively large current, the voltage drop due to the internal resistance becomes significant. If this is done, the voltage drop due to the internal resistance will increase with the passage of time, and it can be used as a measure of the capacity of the nicad battery. This is an indirect measurement of the internal resistance of the NiCd battery.

FIG. 3 shows a circuit configuration example of the constant current load circuit 17. In the figure, B is a measured Nicad battery pack,
Δr is its internal resistance, Tr is a transistor, R is a current detection resistor, 21 is the power supply unit shown in FIG. 3, and 36 is a constant current control circuit. The transistor Tr and the current detection resistor R are connected in series to the measured NiCd battery pack B. The constant current control circuit 36 has a comparison circuit, creates a reference voltage from the power supply from the power supply unit 21, compares the reference voltage with the detection voltage of the current detection resistor R, and uses the comparison output to compare the transistor Tr with the detection voltage. Control the base current of. That is, since a voltage proportional to the load current is generated across the current detection resistor R, the current decreases as the voltage generated in the current detection resistor R increases, so that the current increases when the voltage decreases. As described above, by controlling the transistor Tr in series, it is possible to discharge with a constant current. By using a constant current load, the internal resistance is measured accurately by preventing the discharge current from decreasing due to the voltage of the NiCd battery decreasing with the amount of discharge.

For comparison, FIG. 4 shows a case where a resistor R is used as a load of a NiCd battery as in the conventional case. B in the figure
Is a nickel-cadmium battery pack, Δr is its internal resistance, and V is a voltmeter (tester) connected across the load resistance R. here,
Assuming that the current flowing through the load resistor R is I, the voltage across it is V, and the NiCd battery voltage at no load is VB, then V = {R (R + Δr)} VB I = VB / (R + Δr) From this equation, internal resistance Δr due to deterioration of Ni-Cd battery
As the load current I decreases with increasing, the resistance R of the load must be decreased to obtain a constant current load.

FIG. 5 shows an example of the circuit configuration of the depolarizing circuit, which is shown in FIG.
The flowchart of the operation example is shown in FIG. Depolarization circuit 1
4 is composed of a measurement unit 18, a control unit 20, and a polarity reversal relay 33. The measurement unit 18 detects a voltage, and the control unit 20 determines whether or not the polarity is correct. To start. When the polarities are opposite, the control unit 20 operates the polarity reversal relay 33, and the switching unit 32, which is the contact, inverts the polarities and then starts the measurement according to the procedure.

FIG. 7 shows an example of a flow chart of the Nicad battery pack capacity test.

When measuring capacitance, first, the measurement terminal 30
8 or 9 is connected to the NiCd battery pack, mode setting is performed by the mode changeover switch 7 of the operation unit 31, and the measurement start switch 4 is operated for the set mode. In response to this, when the depolarizing circuit 14 is required, the polarity is switched to make the polarity constant, and the control unit 20 issues a command to operate the constant current load switch 16 to operate the constant current load circuit 17. After the measurement unit 18 detects that the voltage of the NiCd battery pack has reached the discharge end voltage, the control unit 20 commands the NiCd battery pack to share the constant current load circuit 17 with the specified current. Charging section 19
The charging is started by, and the charging is ended after the elapse of the set time or when the measuring unit 18 detects the full charge. Subsequently, the constant current load circuit 17 is discharged, and at the same time, the counter built in the control unit 20 is operated,
Simultaneously with displaying the elapsed time on the display unit 1, the measuring unit 18 determines whether the discharge end voltage has been reached. When the end-of-discharge voltage is reached, the counter of the control unit 20 is stopped, and the time from the start of discharge to the end-of-discharge voltage is calculated from the number of counts. The nickel-cadmium battery pack that maintains the output voltage of the battery pack is determined to be good, and the nickel-cadmium battery pack that cannot be maintained is determined to be defective, and the display unit 1 displays the quality result and the voltage value.

As shown in the charging / discharging characteristic diagram of FIG. 12, when discharging at 1 / 5C, it takes about 5.5 hours until the discharge end voltage is reached. According to the above, it can be determined that 60% of the rated capacity is sufficient, and therefore it can be determined that it takes about 3 hours or more until the discharge end voltage is reached. Utilizing this, by discharging at 1C, discharge can be performed in about 1 hour, and the decrease in time due to short-time discharge is corrected to 60% of the rated capacity, that is,
Since it can be determined that it takes about 36 minutes or more to reach the discharge end voltage, it is possible to make a pass / fail determination in a short time. Further, by setting the voltage and current of each nicad battery pack by the operation unit 31, it is possible to perform charging and capacity measurement suitable for the capacity.

Further, it is possible to judge the capability of the power supply adapter by using this device. In that case, as shown in the block diagram of FIG. 2, the pin plug of the power adapter is connected to the power adapter common jack 10 of the measurement terminal 30, and the measurement is performed for the mode set by the mode changeover switch 7 of the operation unit 31. By operating the start switch 4, the control unit 20 gives a command, the apolarization circuit 14 identifies the polarity, activates the constant current load switch 16 and loads the power adapter with the constant current load circuit 17, and the control unit 20 The initial voltage value of the power supply adapter is measured by the measuring unit 18, the memory 35 is stored in the control unit, and the calculated value is compared with the voltage value after the elapse of the measurement time set in advance by the control unit 20. The pass / fail result and the voltage value are displayed in 1.

8A and 8B are top and side views showing an example of the structure of the shared jack 10, FIG. 9A shows the pin plug structure of the power adapter, and FIG. 9B shows the power adapter pin plug. And shows the connection status of the shared jack. With the shared jack 10 which is the measurement terminal of the power adapter of this example, the jacks used for connecting the pin plugs that differ depending on the type of the power adapter used in the cordless phone are shared by the following structure. In this example, as shown in FIG. 8, the diameter of the center electrode 22 is set to be less than the minimum inner diameter of the pin plug 29 of the power adapter for cordless phones currently on the market, so that the power adapter pin plug 2
9 can be inserted regardless of the size of the inner diameter 25. on the other hand,
The external electrode 23 is a spring-like electrode biased toward the center electrode 22 so that the distance between the center electrode 22 and the center electrode 22 is suitable even for a large-sized cordless phone power adapter that has a large jack outer shape. Even if the inner diameter 25 of the pin plug is large, since the outer electrode 28 has a spring shape, the outer electrode 28 comes into contact with the inner electrode 27 due to the spring pressure of the outer electrode 23, and the inner electrode 27 comes into contact with the center electrode 22. And regardless of the size of the pin plug outer diameter 26,
Connection is possible as shown in FIG. 9B, and measurement is possible.

In addition, the cord connected to the main body of the power adapter is the same cord as the telephone line and the power line.
Some power adapters are available in modular or 8-core modular jacks (MJ). Therefore, in this embodiment, by providing the power adapter jack (MJ4 type) 11 and the power adapter jack (MJ8 type) 12 shown in FIG.
The measurement is easy.

Further, a method of determining the ISDN connection quality will be described below. In this method, the wiring terminal TA of the DSU
-By determining the polarity of the voltage between TA and RA of TB / RA and RB and between TB and RB, it is determined whether the connection is properly connected.

The MJ8 terminal 13 for ISDN of the measuring terminal 30 shown in FIG. 1 is connected by using the telephone cord and the MJ mounted on the ISDN bus wiring, and the mode set by the mode selector switch 7 of the operation unit 31 is set. In response to this, the measurement start switch 4 is operated. In response to this, the measuring unit 18 discriminates the polarity, and the control unit 20 sends an instruction to the mode set by the mode changeover switch 7 of the operation unit 31 for the voltage between TA and RA of the MJ8 shown in FIG. Then, the measuring unit 18 determines the presence or absence of voltage and the polarity. Here, when the voltage is output, it is determined whether the output voltage of the DSU is within the specified value or out of the specified value, and the display unit 1 displays between TA and RA and TB and R.
The judgment result of the voltage value between B and the polarity is good or bad is displayed.

In addition to the above, the apparatus of this embodiment is used to measure a manganese dry battery / small lead battery using the measuring unit 18 and the control unit 20, or a newly developed Nicad battery pack or the like. Also in the secondary battery, voltage value, capacity,
The judgment reference value can be set and changed, and by considering the terminal shape and providing a separate lead terminal, it is possible to easily perform measurement regardless of the terminal shape.

As described above, the complicated measurement procedure can be easily performed, and it is possible to deal with the case where the number of types of the secondary battery is increased. In addition, in order to prevent battery consumption due to forgetting to turn off the power switch,
If you leave it unused for a certain period of time, the power is automatically turned off.
As described above, F can be used.

FIG. 11 shows a display example of the display unit 1. The display of the display unit 1 displays the name of the measurement item, the number of battery groups, the capacity of the battery, the initial value or the final value of the measurement, the elapsed time, the judgment result of pass / fail, etc. The measurement item names are displayed as shown in Table 1, and the other display items are displayed as shown in Table 2.

[0037]

[Table 1]

[0038]

[Table 2]

[0039]

As is apparent from the above description, according to the rechargeable battery tester for cordless telephones of the present invention, it is possible to measure the capacity, life or performance of the rechargeable battery or power adapter of the cordless telephone by a simple operation. Judgment or IS
The quality of the DN connection can be determined.

According to the second aspect of the invention, in particular, the connection of the power supply adapter for charging the main body of the telephone becomes easy, and its performance can be measured or judged with good workability.

[Brief description of drawings]

FIG. 1 is an external view showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the above embodiment.

FIG. 3 is a diagram showing a circuit configuration example of a constant current load circuit used in the above embodiment.

FIG. 4 is an explanatory diagram of a load circuit without a constant current control function.

FIG. 5 is a diagram showing a circuit configuration example of a depolarizing circuit used in the above embodiment.

FIG. 6 is a flowchart showing an operation example of the depolarizing circuit.

FIG. 7 is a flowchart showing a NiCd battery pack capacity test in the above embodiment.

8A and 8B are structural diagrams of a shared jack used in the above embodiment.

9 (a) and 9 (b) are views showing a connection state of the power adapter pin plug and the shared jack.

FIG. 10 is a terminal layout diagram of a measuring terminal MJ8 having an ISDN connection in the above embodiment.

FIG. 11 is a diagram showing a display example on the display unit of the above embodiment.

FIG. 12: Charging / discharging characteristic diagram of NiCd battery

[Explanation of symbols]

 1 ... Display unit 2 ... AC / DC changeover switch 3 ... Power switch 4 ... Measurement start switch 5 ... DOWN switch 6 ... UP switch 7 ... Mode changeover switch 8 ... Nicad battery pack connection connector 9 ... Nicad battery pack connection connector 10 ... Power adapter common jack 11 ... Power adapter plug-in terminal (MJ4 type) 12 ... Power adapter plug-in terminal (MJ8 type) 13 ... ISDN MJ8 14 ... Depolarizing circuit 15 ... Charging changeover switch (relay) 16 Constant current load switch 17 Constant current load circuit 18 Measuring unit 19 Charging unit 20 Control unit 21 Power supply unit 30 Measuring terminal 31 Operating unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H02J 7/00 Q H04B 7/26 (72) Inventor Takeshi Furugun 1-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo No. 6 Nippon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A charging terminal for a cordless telephone, a measuring terminal to which a power adapter or a modular jack with an ISDN connection is connected, a depolarizing circuit for making the polarity of the connected charging battery or charging adapter constant, and the charging. A constant current load circuit that discharges a battery or a charging adapter with a constant current, a charging unit that charges the charging battery with a predetermined voltage or for a predetermined time, and by switching the terminal voltage of the charging battery or charging adapter with the same polarity, A measuring unit for measuring the voltage between terminals of the ISDN connection and its polarity when the load or the constant current load circuit is connected, and the measured terminal voltage or the terminal voltage drops to a predetermined voltage by the constant current load circuit. Depending on the counting time until A rechargeable battery tester for a cordless telephone, comprising: a control unit that measures or determines the quality, or determines whether the ISDN connection is good or bad based on the terminal voltage and polarity of the ISDN connection. 2. The rechargeable battery tester for a cordless telephone according to claim 1, wherein the measurement electrode for connecting the power adapter has a diameter such that the center electrode can be inserted into the minimum inner diameter of the terminal of the power adapter, and the outer electrode is on the side of the center electrode. A rechargeable battery tester for cordless telephones, characterized in that a spring-like electrode biased to the.