JPH0533648U - Charger - Google Patents

Abstract

(57) [Summary] [Structure] The result of the comparison between the inactive battery detecting means for detecting the battery voltage immediately after the start of charging and comparing the detected value of the preceding stage with the detected value of the latter stage, the latter stage Of the inactivity degree detection means for activating the timer means when the detection value of the battery is small and the inactivation degree detection means for comparing the battery voltage with the reference voltage after the first predetermined time has elapsed after the timer means is activated. As a result, when the battery voltage is lower than the reference voltage, the charging is immediately terminated, and when the battery voltage is higher than the reference voltage, the charging is terminated after the second predetermined time of the timer means. [Effect] Even when the inactive state of the battery to be charged is detected and the inactive state in which the peak value does not appear at the end of charging, the charging is completed after a predetermined time by the timer means, so that the battery is fully charged. Can be approached to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a charger that can appropriately charge an inactive battery.

[0002]

[Prior Art]

 Generally, when a battery in an inactive state (over-discharged state, etc.) is charged, the charging voltage characteristics show that the battery voltage rises once immediately after the start of charging, then drops and stabilizes immediately, and then slowly. It is known that the battery voltage rises. A charging device capable of properly charging such an inactive battery is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-288740. The charging method disclosed in this publication measures the battery voltage of the battery to be charged, detects that the measured voltage has dropped below the peak value by a predetermined value, and terminates charging. It is characterized by periodically detecting the voltage and starting the voltage detection for charging control when the increment of the detection voltage becomes positive. Therefore, when charging a battery in an inactive state, it is possible to prevent an erroneous operation in which the voltage drop immediately after the start of charging the battery is indistinguishable from the voltage drop at the time of full charge and the charging is terminated.

By the way, when a secondary battery such as a nickel-hydrogen storage battery is in an inactive state, a peak value may not appear in the battery voltage at the end of charging. When such a battery is charged, the peak value does not appear, so it is not possible to detect that the peak value has dropped below the peak value and terminate the charging.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above conventional charging method, and detects an inactive state of a battery to be charged, and appropriately charges even a battery in which a peak value does not appear at the end of charging. It is to provide a charger that can.

[0005]

[Means for Solving the Problems] The present invention relates to a charger that measures the battery voltage of a battery to be charged, detects that the measured voltage is lower than a peak value by a predetermined value, and terminates the charging. Activates when the detected value of the latter stage is small as a result of the comparison between the inactive battery detection unit that detects the battery voltage immediately after the start and compares the detected value of the former stage with the detected value of the latter stage And the inactivation degree detecting means for comparing the battery voltage and the reference voltage after the first predetermined time has elapsed after the timer means is activated. As a result of the comparison of the inactivation degree detecting means, the battery voltage is the reference. When the voltage is lower than the voltage, the charging is immediately terminated, and when the battery voltage is higher than the reference voltage, the charging is terminated after the second predetermined time of the timer means.

[0006]

[Action]

 According to this invention, the inactive battery detecting means detects the battery voltage immediately after the start of charging and compares the detected value of the front stage with the detected value of the rear stage. If the detected value in the latter stage is larger, the battery voltage is rising and it is determined that the battery to be charged is normal. In this case, the charging is terminated when it is detected that the battery voltage falls below the peak value by a predetermined value. On the other hand, if the detected value in the latter stage is smaller, the battery voltage has dropped and it is determined that the battery to be charged is inactive. At this time, the timer means operates and, after a first predetermined time, the inactivity detecting means compares the battery voltage with the reference voltage. When the battery voltage is lower than the reference voltage, the battery voltage of the battery to be charged has not recovered sufficiently, so it is determined that the battery is in a deep inactive state, and charging is immediately terminated. On the other hand, when the battery voltage is higher than the reference voltage, it is determined that the battery voltage of the battery to be charged has recovered and is in a shallow inactive state, and charging is terminated after the second predetermined time of the timer means.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 denotes a charging power supply unit that converts commercial alternating current into direct current, and supplies a charging current to a nickel-hydrogen storage battery 2 that is a battery to be charged. Reference numeral 3 is a switching means interposed between the charging power source unit 1 and the nickel-hydrogen storage battery 2, for switching on / off the supply of the charging current to the nickel-hydrogen storage battery 2, and for changing the charging current (trickle charging current and rapid charging current). Control the charging current). Reference numeral 4 is a battery voltage detecting means for periodically detecting the battery voltage of the nickel-hydrogen storage battery 2 being charged. The voltage detecting means 4 detects the battery voltage, thereby detecting full charge, detecting an inactive battery, and detecting the degree of inactivity. Reference numeral 5 is a timer means, and the switching means 3 is controlled by the output of the timer means.

When the nickel-metal hydride storage battery 2 is attached to the charger of the present invention and charging is started in the above-described configuration, a charging current is supplied from the charging power supply unit 1 to the nickel-hydrogen storage battery 2 via the switching means 3. . At this time, the battery voltage detection means 4 periodically detects the battery voltage of the nickel hydrogen storage battery 2. The operation of this charger will be described below with reference to the flow chart of FIG. 2. First, at the start of charging, the charging power supply unit 1 supplies the trickle charging current to the nickel-hydrogen storage battery 2. During this period, the battery voltage detecting means 4 compares the battery voltage with the first reference voltage. If the battery voltage does not exceed the first reference voltage, the battery is judged to be short-circuited and charging is immediately terminated. If the battery voltage exceeds the first reference voltage, charging is continued and the switching means 3 switches from trickle charging to rapid charging. Immediately after the rapid charging is started, the battery voltage detecting means 4 compares the detected voltage of the front stage with the detected voltage of the rear stage. If the detected value at the latter stage is higher, the battery voltage is rising and it is determined that the battery to be charged is normal. In this case, the charging is terminated when it is detected that the battery voltage falls below the peak value by a predetermined value at the end of charging. On the other hand, if the detected value in the latter stage is smaller, it is determined that the battery voltage has dropped and the battery to be charged is inactive. In this case, the battery voltage detecting means 4 compares the battery voltage with the second reference voltage after the first predetermined time has elapsed since the timer means 5 was activated. When the battery voltage is lower than the second reference voltage, the battery voltage of the battery to be charged has not fully recovered, so it is determined that the battery is in a deep inactive state, and charging is immediately terminated. On the other hand, when the battery voltage is higher than the second reference voltage, it is determined that the battery voltage of the battery to be charged has recovered and is in a shallow inactive state, and charging is performed after the second predetermined time of the timer means 5. finish.

This charger detects the full charge by detecting that the battery voltage drops from the peak value by a predetermined value. However, when detecting the inactive state immediately after the start of the rapid charge, , The charging control for full charge detection is started from the start of charging so that the detection voltage of the latter stage is lower than the detection voltage of the previous stage and it is judged that this is the prescribed value decrease at full charge and no malfunction occurs. It is designed so that it will not operate for a predetermined time. In addition, even if the peak value does not appear at the end of charging even for a normal battery, the timer means 5 operates to stop charging and the LED built in the charger displays an abnormal display. It is supposed to do.

[0011]

[Effect of the device]

 As described above, according to the present invention, the inactive state of the battery to be charged is detected, and even if the battery is in the inactive state in which the peak value does not appear at the end of charging, the timer means is used after a predetermined time. Since charging is completed, you can approach full charge.

[Brief description of drawings]

FIG. 1 is a block circuit diagram.

FIG. 2 is a flowchart.

FIG. 3 shows charging voltage characteristics of a normal battery and an inactive battery.

[Explanation of symbols]

 1 Charging Power Supply Unit 2 Nickel Hydrogen Storage Battery 3 Switching Means 4 Battery Voltage Detection Means 5 Timer Means

Claims (1)

[Scope of utility model registration request] 1. A battery charger that measures the battery voltage of a battery to be charged, detects that the measured voltage has dropped below a peak value by a predetermined value, and terminates charging to detect the battery voltage immediately after the start of charging. The inactive battery detection means for comparing the detection value of the front stage with the detection value of the rear stage, the timer means that operates when the detection value of the rear stage is small as a result of the comparison of the inactive battery detection means, and the timer means operates. And the inactivation degree detecting means for comparing the battery voltage with the reference voltage after the first predetermined time. As a result of the comparison of the inactivation degree detecting means, the charging is immediately terminated when the battery voltage is lower than the reference voltage, A charger which terminates charging after a second predetermined time of the timer means when the voltage is higher than a reference voltage.