JPS5918367Y2 - Charger performance test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charger, and particularly to a performance test device for a charger for charging a storage battery incorporating a coulometer.

In the conventional device of this kind, as shown in Fig. 2, a storage battery B having an actual coulometer CM connected in series is connected to the charger terminal, or a variable resistor VR is used as a pseudo load of the battery.
In place of the coulometer, a storage battery of about the same capacity was used as a circuit consisting of a parallel circuit with an electrolytic capacitor C and a coulometer. However, many low-cost chargers use the quasi-constant current method, which means that the current may fluctuate as the load voltage fluctuates, making it difficult to measure the rating at one point.

In addition, in the case of a pseudo load that is a combination of a resistor, capacitor, and storage battery as an alternative to the coulometer that is currently widely used, it is easy to keep the voltage constant by changing the resistor, and it is relatively easy to measure a single point on the charger. However, in the case of a quick charger, there is usually a large difference in charging current between rapid charging and auxiliary charging, so it is necessary to adjust the voltage with a resistor each time when measuring, even with a dummy load. However, there were drawbacks such as the troublesome measurement and the need for a storage battery as an alternative to the coulometer.

The present invention has been devised in view of these shortcomings, and enables quick charger performance measurement tests to be performed reliably, easily, and quickly with almost no voltage adjustment even when the current changes.
Moreover, the present invention does not require a storage battery as a substitute for a coulometer, making it suitable for implementation.

Next, an embodiment of the present invention shown in FIG. 1 will be described.

1 is a charger, ■ is a voltmeter, A is an ammeter, and C is an electrolytic capacitor, which is responsible for the capacity of the actual storage battery.For example, if the storage battery capacity is 450mAh15 hr
5000-1000 for ~10 Ah15 hr
By using a capacitor of about 0 μF, the test can be carried out without any practical problems.

2 is a variable resistor VR, transistors TR1, TR2,
In a typical voltage stabilizing circuit consisting of a resistor R1, a constant voltage diode D, etc., the voltage is divided by a variable resistor VR, and compared with a reference voltage given by a constant voltage diode D, the fluctuation of the output voltage is determined by transistors TR, The voltage is sent to the base of the control transistor TR2, which is amplified by an error amplifier consisting of a load resistor R, and the internal resistance of the transistor TR1 changes with respect to the input, so that the input voltage is kept constant.

An electrolytic capacitor C is connected in parallel to the control transistor TR2 of the voltage stabilizing circuit 2 to form a pseudo load circuit of the storage battery, and a pseudo generated voltage of the coulometer is obtained between the voltage stabilizing circuit 2 and the terminal. For this purpose, a diode S is connected in series in the forward direction, and a changeover switch 3 is connected in parallel with the diode S, and the output side of the diode S is connected to a terminal CM connected to one terminal of the coulometer of the charger 1.
was connected to form a charger performance testing device.

Connect each terminal (+, -, and CM) of the charger performance test device formed in this way to the corresponding output terminal of charger 1, and check how much current is generated for a certain output voltage value of the charger. can be tested to see if it flows.

That is, the changeover switch of the performance test device connected to the charger is closed, the variable resistor VR of the voltage stabilizing circuit 2 is adjusted appropriately, and the output voltage of the charger is set to a predetermined voltage while checking the voltmeter V.

The current at this time is measured with an ammeter A, and the charger performance is evaluated based on the difference between that value and a predetermined value.

Next, when the closed selector switch 3 is opened as shown in the first diagram, a voltage drop across the diode S causes a potential difference of about 0.6 V between the terminal and the terminal CM.

This potential difference is equal to the actual coulometer rise voltage.

Therefore, this causes the control circuit of the charger 1 to operate and reduce the charging current to a predetermined value.

This allows the control circuit to be evaluated, and therefore the performance of the charger including the control circuit to be evaluated.

At this time, the voltage is always constant due to the voltage stabilization circuit 2, so there is no need to adjust it each time as in the conventional case, and it is simple.
Due to the voltage drop, a stable voltage can be easily obtained at all times.

In this way, the present invention uses a storage battery pseudo load circuit consisting of a voltage stabilization circuit 2 that uses the voltage drop due to the internal resistance of the diode S to generate a pseudo generated voltage of the coulometer CM, and a parallel circuit with an electrolytic capacitor C. Due to the constant voltage element of this circuit, there is almost no need to adjust the voltage even if the current changes, and pseudo detection of the coulometer CM is facilitated by the drop voltage of the diode, so that the charging current does not reach the specified value. It has the feature that a performance test to measure whether or not the performance has been achieved can be conducted reliably, easily and quickly, and can be carried out suitably.

[Brief explanation of drawings]

FIG. 1 shows a circuit of a device which is an embodiment of the present invention, and FIG.
The figure shows a conventional example.

Claims (1)

[Scope of utility model registration request] A storage battery pseudo load circuit consisting of a parallel circuit of a diode S and a switch 3, and a parallel circuit of a voltage stabilizing circuit 2 and an electrolytic capacitor C is connected between the terminals + and - connected to the positive and negative output terminals of the charger. are connected in series, and the output side of the diode S is connected to a terminal CM connected to one terminal of a coulometer of the charger.