JPH0641070U - Connector and secondary battery residual amount detection mechanism using the same - Google Patents

Abstract

(57) [Abstract] [Purpose] A device that detects the remaining amount of a secondary battery with less error and higher reliability than the conventional method that measures the voltage drop due to the resistor inserted in the power supply circuit and detects the energizing current. And developing a mechanism. [Structure] One of a pair of connecting terminals 2 and 3 protruding from the insulating housing 1 of the connector is replaced with a nickel-manganese wire or a nichrome wire from the electric conductor, and is replaced with a terminal formed in a shape in which the element terminal 4 is attached. By making a connector and measuring the remaining amount by the secondary battery remaining amount detection mechanism in which a measuring instrument having an operational amplifier as the first stage is attached to the element terminal, the remaining amount of the secondary battery is more stable and reliable than before. Can be detected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connector provided on a circuit board for connecting to a secondary battery such as a nickel-cadmium battery or a lead storage battery, and a secondary battery remaining amount detecting mechanism using the connector.

[0002]

[Prior art]

 In an electronic device using a secondary battery as a power source, a circuit as shown in FIG. 5 is provided to detect the remaining amount of the battery. That is, in the wiring pattern on the circuit board 6 in the electronic device, the resistor 8 is connected to a position connected in series with the power supply line including the load 10, and the voltage across the resistor is measured by the measuring circuit 11. This is a method of calculating the strength of the electric current in the power supply line by measuring with, and detecting the remaining amount of the secondary battery from the value.

However, since the resistor 8 is inserted in the power supply circuit, it generates a large amount of heat and the power loss accompanying it, and in order to minimize these, a substance having a low resistance value of about several milliohms (mΩ) is usually used. Must be connected in series, resulting in an uncertain voltage drop due to the resistance of the solder used to connect the resistor 8 to the wiring pattern on the circuit board 6 and calculated. It was difficult to obtain high reliability in the detection results because the difference in the strength of the current generated was likely to occur.

[0004]

[Problems to be solved by the device]

 The purpose of the present invention is to eliminate the variation in the residual battery measured value due to the soldering of the resistor at the position where it is connected in series with the power line in the wiring pattern on the circuit board in the electronic device. The purpose is to develop and provide a connector with a structure that enables stable and stable detection of the remaining amount and a mechanism for detecting the remaining amount of the secondary battery using the connector.

[0005]

[Means for Solving the Problems] In order to solve such a problem, as a result of earnest research, the inventor has attached a resistor 8 connected in series to a power supply circuit in a circuit board 6 shown in FIG. Instead of abolishing, at least one of the pair of connecting terminals 2 and 3 (see FIG. 4) of the connector 12 connected to the circuit board as shown in FIG. In place of the gun wire or nichrome wire formed of a resistor, a new pair of element terminals (detection pins) 4 and 4 are provided in the connection terminal 3, and the operational amplifier 9 is used as the first stage. It has been found that it becomes possible to stably measure the remaining amount of the secondary battery by adopting the configuration as shown in FIG. 6 in which the measuring circuit in which the A / D converter 13 and the display 14 are connected to each other is connected. To provide the present invention It could be.

The present invention will be described in more detail with reference to FIGS. 1, 2 and 3.

In a conventional connector, as shown in FIG. 4, a pair of connection terminals 2 and 3 which are spaced apart from each other are attached to an insulating housing 1 as current pins, and these materials are made of copper, which has good conductivity. For example, silver. In the present invention, as shown in FIG. 1, the second connection terminal 3 of the pair of (first and second) connection terminals 2 and 3 is made of nickel / manganese wire or nichrome wire having a relatively high electric resistance. Instead, the second connection terminal 3 is further provided with a pair of element terminals 4 and 4 as detection pins. As shown in FIG. 2, the connection between the circuit board and the terminals of the connector is soldered to the wiring pattern on the circuit board 6 by soldering the connection terminals 3 and the pair of element terminals 4 and 4 respectively. There is. When the current flows in the direction 7 indicated by the arrow, a voltage drop occurs between the pair of element terminals 4 and 4 serving as detection pins. Further, in the present proposal, as shown in FIG. 6, the current flowing in the element terminal 4 is adopted because the detection mechanism in which the current flowing in the connecting terminal 3 is taken out by the operational amplifier 9 having a high input resistance connected to the element terminals 4, 4. The amount is very small, there is almost no resistance loss in the soldered portion 5 that joins the element terminal 4 and the circuit pattern, and the remaining amount detection value is stable and highly reliable.

[0008]

In the present invention, as shown in FIGS. 1 and 2, since the connection terminal 3 and the element terminal 4 are integrated to form one of the connection ends of the connector 12, the circuit board 6 and the connection terminal are connected. The soldered portion 5 (see FIG. 2) for each of the parts 2 and 3 has one point compared with the conventional product in which there are two points before and after the resistor, and the electric resistance loss in the soldered part at that portion is reduced. Further, since an operational amplifier having a high input resistance is connected to the pair of element terminals 4 and 4, the current flowing through the element terminal 4 becomes very small, and the electric resistance loss in the soldered portion 5 connecting the element terminal 4 and the circuit board 6 is extremely low. .

With the above effects, the connector according to the present invention and the secondary battery residual amount detection mechanism connected to the connector can detect the secondary battery residual amount stably and with high reliability.

[0010]

Example 1 A nickel-manganese wire was used instead of one of a pair of connection terminals 2 and 3 of a conventional connector (FIG. 4), and a pair of element terminals 4 and 4 were provided as shown in FIG. I made a connector. Reference numeral 1 is an insulating housing of the connector.

Further, the current measuring resistor is removed from the board incorporated in the conventional secondary battery remaining amount detector and short-circuited with a conductive wire, and the above-mentioned connector 12 is connected to the terminal of the circuit board 6 as shown in FIG. The operational amplifier 9 is connected to the first stage, and the secondary battery residual amount detection mechanism according to the present invention, which is connected to the A / D converter 13 and the display 14, is attached to the operational amplifier 9, and the residual amount of the secondary battery is measured. A reliable current value was obtained.

[0012]

Second Embodiment One of the pair of connection terminals 2 and 3 of the conventional connector (FIG. 4) is replaced with a nichrome wire, and one of the element terminals 4 is connected to the connection terminal 3 as shown in 4 in FIG. The result of measuring the remaining amount of the secondary battery by the same method as in Example 1 was also very good as in Example 1 except that it was also used.

[0013]

EFFECTS OF THE INVENTION According to the present invention, one of a pair of connection terminals protruding from a conventional insulating housing is replaced with an electric resistance wire such as nickel, manganese wire or nichrome wire from a conductor such as copper or silver and used as a detection pin. A connector according to the present invention having a shape with a pair of element terminals attached was manufactured and connected to a current supply circuit board of a secondary battery. Further, as a result of detecting the remaining amount by the secondary battery remaining amount detection mechanism in which a measuring circuit having an operational amplifier as the first stage is attached to the element terminal of the connector, a stable measured value with little error was obtained. Therefore, it has become possible to measure the remaining amount of the secondary battery, which has been unreliable due to many measurement errors, in a stable and accurate manner.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a connector according to the present invention in which one of the connection terminals is changed to the material and shape according to the present invention.

FIG. 2 is a side sectional view showing a state in which a connector according to the present invention is attached to a circuit board.

FIG. 3 is a diagram showing an application example of the present invention in which a connection terminal and one of a pair of element terminals are shared.

FIG. 4 is a structural explanatory view of a conventional connector.

FIG. 5 is a diagram showing a conventional detection circuit for detecting the remaining battery level in an electronic device that uses a secondary battery as a power source.

FIG. 6 is a diagram showing a detection circuit of the present invention for detecting the remaining battery level in an electronic device using a secondary battery as a power source.

[Explanation of symbols]

 1 Insulation Housing 2 (First) Connection Terminal 3 (Second) Connection Terminal 4 Element Terminal 5 Solder Attached Section 6 Circuit Board 7 Current Flow Direction 8 Resistor 9 Operational Amplifier 10 Load 11 Measurement Circuit 12 Connector 13 A / D converter 14 Display

Claims (2)

[Scope of utility model registration request] 1. A structure in which a pair of connecting terminals penetrates an insulating housing while being separated from each other, and both ends thereof project from the surface of the insulating housing. At least one connecting terminal of the pair of connecting terminals is provided. A connector characterized in that a pair of element terminals, which are connected to the circuit of the circuit board and serve as DC current detection pins, are provided near an end connected to the circuit board. 2. A remaining amount of a secondary battery, wherein a measuring circuit having an operational amplifier as a first stage is connected to a pair of element terminals of the connector according to claim 1 which is connected to the secondary battery. Detection mechanism.