JP3202759B2 - Charging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device in which a secondary battery provided in a device main body is charged by a charger having a charging display circuit.

[0002]

2. Description of the Related Art Conventionally, there has been provided a blood circulation promoting device which promotes blood circulation by applying a high-frequency electric field to a human body. Since this type of blood circulation promoting device is used by sticking it to a human body, a small secondary battery is built in as a power source, and the secondary battery is charged when not in use.

[0003] A blood circulation promoting device as an apparatus main body 1 is shown in FIG.
As shown in (2), the secondary battery 11 is charged with a constant current via the constant current circuit 12, and the oscillation circuit 13 is operated using the secondary battery 11 as a power source, and a high frequency is output from the antenna 14. Have been. On the other hand, the charger 2 is required to charge the secondary battery 11, and the charger 2 is detachably connected to the device main body 1 via the charging terminal 3. The charger 2 includes a DC power supply 21 composed of a dry battery, and a charge display circuit 22 that indicates that the battery is being charged. The charging display circuit 22 is provided from the DC power source 21 to the secondary battery 1.
1, a current detection resistor 23 inserted in the charging path, a transistor 24 as a switch element that is turned on when a voltage across the current detection resistor 23 is equal to or higher than a predetermined voltage,
The light emitting diode 25 is connected in series between the emitter and the collector of the transistor 24 so that the light is turned on when the transistor 24 is turned on.

[0004]

By the way, in the above configuration, since the current detection resistor 23 is inserted in the charging path, in order not to increase the voltage drop,
It is necessary to set the resistance value of the current detection resistor 23 to a small value. On the other hand, since the voltage between the base and the emitter required for turning on the transistor 24 is about 0.6 V, the resistance value R of the current detection resistor 23 is set so that charging current × R ≧ 0.6. There must be.

Here, when the product is developed in various forms, secondary batteries 11 having various dimensions and capacities are used in accordance with the specifications of the device body 1 such as the dimensions and the continuous use time. The charging current also needs to be changed according to the product. In order to share the charger 2 with several types of device main bodies 1 having different charging currents as described above, it is necessary to design the charger 2 to match the device main body 1 requiring the maximum charging current.

However, in such a charger 2, if the resistance value R is set small in order to reduce the voltage drop due to the current detecting resistor 23, when the device main body 1 having a small charging current is connected, both ends of the current detecting resistor 23 are connected. There is a problem that the voltage does not exceed 0.6 V and the light emitting diode 25 does not light. Conversely, if the resistance value R of the current detection resistor 23 is set so that the light emitting diode 25 is turned on even when the device main body 1 with the smallest charging current is connected, the device main unit 1 with a large charging current is connected. The problem arises that the power consumption by the current detection resistor 23 increases.

In particular, since the blood circulation promoting device has recently become thinner and the charging current of the device main body 1 tends to be smaller, the device has been used in a conventionally provided blood circulation promoting device to suppress an increase in cost. If the charger 2 is to be used, it is necessary to consider the above-described problem. An object of the present invention is to solve the above-described problems, and even when a device body having a small charging current is connected to a charger designed to correspond to a device body having a large charging current, a charging display is performed. It is an object of the present invention to provide a charging device whose circuit operates.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an apparatus body having a secondary battery charged through a constant current circuit, a DC power supply and a power supply to the secondary battery. A charging device comprising a charging display circuit that performs charging display when a voltage across the current detection resistor inserted into the charging path is equal to or higher than a predetermined voltage, and a charging device that is separate from the device body . The output current value is set to a value at which the charge display circuit can operate, and the device body includes an intermittent circuit for intermittently charging the rechargeable battery so that the average charge current matches the specifications of the rechargeable battery. is there.

[0009]

According to the above configuration, the output current value of the constant current circuit is set to a value at which the charging display circuit can operate, and the charging current to the secondary battery is adjusted so that the average charging current matches the specifications of the secondary battery. Since the intermittent circuit for intermittent operation is provided in the main unit, the charging current to the secondary battery provided in the main unit is set by the intermittent circuit. If changed, the charger and the constant current circuit can be shared. Further, since the output current value of the constant current circuit is set to a value at which the charge display circuit can operate, the charge display circuit can be operated intermittently even though the charge current is intermittent, and the charge display can be performed. It is.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a blood circulation promoting device is shown as the device main body 1, but it is not necessarily limited thereto.
The technical idea of the present invention can be applied to other electric devices.
As shown in FIG. 1, the device main body 1 includes a secondary battery 11 serving as a power supply, a constant current circuit 12 inserted in a charging path to the secondary battery 11, and an intermittent circuit 15 for intermittently charging current.
An oscillation circuit 13 oscillating at a high frequency and an antenna 14 for applying a high-frequency electric field to a human body are provided.
Here, the output current value of the constant current circuit 12 is set so as to correspond to the secondary battery 11 having the largest charging current when the product is developed. For example, if the charging current of the secondary battery 11 is selected between 1 and 4 mA depending on the product development, the output current value of the constant current circuit 12 is 4
It is set to mA. The intermittent circuit 15 is a circuit for intermittently charging current at a constant frequency, and adjusts an average value of charging current by adjusting on-duty. That is, as shown in FIG. 2, if the output current value of the constant current circuit 12 is 4 mA, the on-duty is set to 25% in order to correspond to the secondary battery 11 having the charging current of 1 mA (see FIG. 2). 2a), 50% (b in FIG. 2) when the charging current is 2 mA, and 75% when the charging current is 3 mA (c in FIG. 2). When the charging current is 4 mA, the charging current is continuously supplied as shown in FIG. In this case, the intermittent circuit 15 need not be provided. In FIGS. 2A, 2B and 2C, broken lines indicate average charging currents.

On the other hand, a charger 2 for charging the secondary battery 11
Has the same configuration as that described in the section of the prior art, and includes a DC power supply 21 composed of a dry battery and a charge display circuit 22 for displaying that the battery is being charged. Further, it is detachably connected to the device main body 1 via the charging terminal 3. The charging display circuit 22 is provided from the DC power source 21 to the secondary battery 1.
1, a current detection resistor 23 inserted in the charging path, a transistor 24 as a switch element that is turned on when a voltage across the current detection resistor 23 is equal to or higher than a predetermined voltage,
The light emitting diode 25 is connected in series between the emitter and the collector of the transistor 24 so that the light is turned on when the transistor 24 is turned on.

According to the above configuration, since the charging current is interrupted by the interrupting circuit 15, the average current may be adjusted to the specifications of the secondary battery 11. Since the peak value of the charging current is set by the output current value of the constant current circuit 12, if this value is set to a value that allows the charging display circuit 22 to operate, the charging current can be reduced. Can also operate the charging display circuit 22. That is, the light-emitting diode 25 is turned on only during the period during which the charging current is supplied. Here, the light emitting diode 25 blinks, but the frequency of the intermittent circuit 15 is set to several tens of H.
If it is set to z or more (for example, 40 Hz), there is no problem because it looks as if it is lit continuously.

[0013]

As described above, the present invention relates to a device body provided with a secondary battery charged via a constant current circuit, a current detection device provided with a DC power supply and inserted into a charging path to the secondary battery. A charging device including a charging display circuit that performs charging display when the voltage across the resistor is equal to or higher than a predetermined voltage, and a charging device that is separate from the device body. The charging display circuit is set to a value that can be operated, and an intermittent circuit that interrupts the charging current to the secondary battery so that the average charging current matches the specifications of the secondary battery is provided in the device body. The charging current to the rechargeable battery is set by an intermittent circuit, and if the design specifications of only the intermittent circuit are changed according to the specifications of the rechargeable battery, the charger and the constant current circuit can be shared. It has the advantage that. Further, since the output current value of the constant current circuit is set to a value at which the charge display circuit can operate, the charge display circuit can be operated intermittently even though the charge current is intermittent, and the charge display can be performed. It has the advantage that. Cost
The current required for the charge display circuit to display the charge.
Can also charge rechargeable batteries with low charging current
Will be possible. As a result, the manufacturer only needs to change the specifications of the intermittent circuit when manufacturing the device main body having different specifications, so that the charger can be shared and the increase in the manufacturing cost can be suppressed. On the user side,
When the user purchases a device main body having a specification different from that used conventionally, the conventional charger can be used as it is, and only the device main body needs to be purchased.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment.

FIG. 2 is an operation explanatory diagram of the embodiment.

FIG. 3 is a circuit diagram showing a conventional example in which an intermittent circuit is not used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 2 Charger 11 Secondary battery 12 Constant current circuit 15 Intermittent circuit 21 DC power supply 22 Charging display circuit 23 Current detection resistor 25 Light emitting diode

Claims (1)

(57) [Claims] 1. A device main body including a secondary battery charged through a constant current circuit, and a DC power supply and a voltage across a current detection resistor inserted in a charging path to the secondary battery is equal to or higher than a predetermined voltage. In a charging device including a charging display circuit that performs a charging display when the charging device is and a device that is separate from the device main body, the output current value of the constant current circuit is set to a value at which the charging display circuit can operate, A charging device characterized in that the device main body includes an intermittent circuit for intermittently charging current to the secondary battery such that an average charging current matches the specifications of the secondary battery.