JPH10210673A - Manual portable charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manual portable charger comprising a manually rotated generator which is usable conveniently for portable telephones, portable radios, flash lamps, and the like. SOLUTION: This charger 100 is provided with a handle 1 freely ratatable manually, a generator 3 which generates a voltage by the rotation of the handle 1, and a constant voltage circuit for making the generated voltage of the generator 3 constant, an output terminal for charging a secondary battery by the output from the constant voltage circuit, and a detecting circuit 7 which detects the value of a specified voltage or current to be applied to the secondary battery being an object to be charged. The constant voltage circuit is constituted by a step-down DC-DC converter 4, and the detecting circuit 7 judges the completion of the charging of the secondary battery which is the object to be charged as well as being used as an indicating circuit for displaying corresponding charging conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable charging device having a built-in manual power generator, which can be conveniently used in portable telephones, portable radios, flashlights and the like. The present invention relates to a manual portable charging device.

[0002]

2. Description of the Related Art Conventionally, many manual charging devices of this type have been used for devices that operate with relatively small amounts of power, such as toys, portable radios, wristwatches, and the like. No. 7-494).

In order to charge a variety of secondary batteries in a relatively short time, a method using a large current can be used. An output from a charging device is stored in a predetermined capacitor, and the charge is passed to a load. Such a configuration has been proposed (JP-A-3-36944).

[0004]

However, when the discharge from the capacitor is used in such a conventional technique, the charge capacity depends on the capacity of the capacitor. However, it is not suitable for a portable type. Also, if the energizing energy is large, the shock received in the event of a short circuit increases, and there is a possibility that the physical danger to the user may increase.

[0005] The portable manual charging device is persistent, for example, in the event of a disaster such as an earthquake or a typhoon, when the supply of external power such as commercial power is interrupted, for example, for charging a battery to an emergency communication device. Although there is a demand, a simple structure having sufficient functions and being inexpensive has not been obtained.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has the following arrangement. (1) A manually-operated rotatable handle, a generator that generates a voltage by rotating the handle, a constant-voltage circuit that converts the generated voltage of the generator to a constant voltage, and an output from the constant-voltage circuit. And a detection circuit for detecting a predetermined voltage value or current value applied to the secondary battery to be charged. The constant voltage circuit is a step-down DC-DC
A hand-held portable charging device comprising a converter, wherein the detection circuit also serves as a display circuit that determines the end of charging of the secondary battery to be charged and displays a corresponding charge display.

(2) It further comprises a changeover switch for switching the charge amount of the secondary battery to be charged in multiple stages, together with the manual rotary handle, generator, constant voltage circuit, output terminal, charge display circuit and the like. The manual portable charging device according to (1), which is housed in the same case.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has been made in order to solve the above-mentioned problem, and will be described with reference to FIG. 1. Referring to FIG. Is set to a required gear ratio, and the DC generator 3 having the same configuration as a normal DC motor is rotated.

The DC output voltage (for example, 20 V) from the DC generator 3 is once converted to a predetermined AC voltage by the DC-DC converter 4 and then reduced to a required DC voltage (for example, 5 V).

The DC output from the DC-DC converter 4 is charged to a secondary battery 8A to be charged in the charging battery box 8, and whether or not predetermined charging has been performed (also serves as a charging determination circuit). It can be confirmed by the voltage detection circuit 7. Then, the secondary battery 8 that has been charged in a predetermined manner
A will be used for the desired purpose.

[0011]

FIG. 1 is a schematic configuration diagram of a manual portable charging device 100 according to one embodiment of the present invention. In FIG. 1, a rotating handle 1 rotates a DC generator 3 having a configuration similar to that of a DC motor via a gear box (transmission unit) 2 described later.

The speed change section 2 has an appropriate number of gears, and the rotational speed of the DC generator 3 can be appropriately adjusted by setting a required gear ratio by combining them.

A DC-DC converter 4 following the DC generator 3 temporarily converts the DC output voltage from the DC generator 3 into a predetermined AC voltage, raises and lowers the required voltage, and then converts it to a corresponding DC voltage. Things. Note that the DC-DC here
The converter 4 is of a step-down type, and receives an output of, for example, 20 V from the DC generator 3 and reduces the output to, for example, 5 V. This makes it possible to efficiently charge a low-voltage secondary battery of, for example, about 3.6 V.

The output adjusting resistor 5 includes a first resistor 51 and a second resistor 51.
A second resistor 52 and a third resistor 53;
The resistor 52 and the third resistor 53 exhibit a parallel value of the two or a value of only the second resistor 52 according to ON / OFF of the output changeover switch 6. The output from the DC-DC converter 4 is a second resistor 52 and a third resistor 53
When the output changeover switch 6 is on, a voltage based on the parallel value of the second resistor 52 and the third resistor 53 is fed back, and when the output changeover switch 6 is off, The voltage based on the value of the second resistor 52 is fed back, and the DC voltage is adjusted according to the amount of the feedback.
-Adjustment is made so as to increase or decrease the output value from the DC converter 4.

The charge determination circuit 7 functions as a voltage detection circuit. The charge determination circuit 7 detects a charge voltage for a secondary battery 8A at a subsequent stage connected through output terminals 7A, 7A, and determines a predetermined voltage. It is determined whether or not the battery has been charged.

The charging battery box 8 is a part for connecting the secondary battery 8A to be charged to a predetermined connecting portion to perform a charging process. The charging battery box 8 can be replaced by providing a battery connection connector. In the charging battery box 8, for example, two (2.4 V) or three (3.6 V) secondary batteries of 1.2 V are connected in series and charged.

FIG. 2 is a diagram exemplifying a circuit arrangement after the DC-DC converter 4 in the device of the embodiment of the present invention, and mainly exemplifies the charge determination circuit 7. In FIG. 2, the output from the DC-DC converter 4 passes through an oscillating unit including a coil L and a capacitor C1, reaches a voltage dividing unit including resistors R1 and R2,
Is fed back to the DC-DC converter 4. In the resistor R2, a plurality (for example, two) of resistors can be connected in parallel, and can be connected and separated as necessary. Here, the diode D1 connected to the output side of the DC-DC converter 4 is for preventing the negative component of the oscillation output of the oscillation section from flowing back to the DC-DC converter 4 side. The positive component of the oscillation output is grounded from the resistors R1 and R2.

The output from the DC-DC converter 4 obtained in this manner is supplied to the current limiting resistor R3 and the capacitor C
2, the charge determination circuit 7 is reached, and the charging battery 8A is charged.

In the charge determination circuit 7, the voltage A
The detection site of (for example, 2.4 V) is composed of a series circuit of a current limiting resistor R4, a light emitting diode LED1, and a non-contact switch TR1, and the detection site of the voltage B (for example, 3.6V) is a current limiting resistor R5, a light emitting diode. It consists of a series circuit of LED2 and contactless switch TR2. The selection is made manually by a changeover switch SW provided at the preceding stage, and based on this changeover operation, one of the non-contact switches TR1 and TR2 becomes conductive.

The diode D2 provided at the detection site is for preventing backflow from the charging battery 8A. Each of the voltage A block and the voltage B block here is composed of an existing IC circuit, and includes a logic unit such as a simple comparator. For example, in the case of switching to the former, when charging to the charging battery 8A is specified to be 2.4 V, a predetermined logic unit (not shown) in the voltage A block operates to activate the non-contact switch TR1. The conduction is performed, and the corresponding light emitting diode LED1 emits light. Regarding the latter, the charging of the charging battery 8A is 3.
When the voltage is set to 6 V, the non-contact switch TR2 on the voltage B block side is similarly turned on, and the corresponding light emitting diode LED2 emits light. Here, it is preferable that the light emitting diodes LED1 and LED2 have different colors from each other. For example, the former is set to red and the latter to blue, and it is determined whether the color is 2.4 V or 3.6 V.
Which of V is charged can be easily identified. According to the comparator means in the voltage A block, the charge amount of the charging battery 8A is equal to the reference value (2.
4V), and when they match, the corresponding light emitting diode LED1 is set to a specific state such as a blinking state or an extinguished state, and the end of the charging can be known. Such an operation is similarly performed on the voltage B block side.

Here, if a two-color light emitting diode is used as the light emitting diode, the number of parts to be used is greatly reduced, although there is a slight increase in cost, and there is also an advantage in miniaturization of the device.

In the apparatus of the present invention shown in FIGS. 1 and 2, the following operation was tried, and the progress and results will be described.

The DC generator 3 was rotated, and an output voltage of 20 V was obtained. Then, this output voltage is DC-
The voltage was applied to the input side of the DC converter 4. Here, [1] When a conventionally used constant voltage circuit (not shown) (consisting of a predetermined capacitor and a three-terminal regulator) was used, an output of 5 V was obtained as a result. Then, based on this output, a rating of 3.6 V,
A Ni-Ca battery 8A as a 180 mAH secondary battery was charged. The charging current at this time was about 80 mA.

After performing such a charging process for 5 minutes,
When an operation test was performed using a commercially available mobile phone, about 30
Seconds call was possible. Although a PHS with low power consumption was used as the mobile phone, the capacity of the regular battery was 3.6 V and 550 mAH.

[2] Next, when a step-down DC-DC converter as in the apparatus of the embodiment of the present invention was used as the constant voltage circuit, in the same test as described above, it took 3 minutes for the charging process for about 2 minutes. Minute calls were possible. Also,
The charging current during the charging process was about 350 mA.

Here, the reason why a step-down DC-DC converter is used will be described. The output level of the DC generator used in the apparatus of the embodiment of the present invention is about 10 to 30 V, and the secondary battery mounted on the mobile phone to be used is of the 3.6 V level. Input a voltage of about 20V
It is advantageous to use a step-down type that outputs a voltage of the order of magnitude.

Assuming that a step-up DC-DC converter is used, if the input voltage of about 20 V is boosted, for example, by a factor of two, the input voltage will be 40 V. For this reason, the above-mentioned 3.6 is used.
When charging a low-voltage secondary battery of about V, there is a disadvantage that an overcurrent flows and heat generation is remarkable, and the secondary battery itself may be destroyed.

Further, based on the difference in the number of rechargeable batteries to be charged, the voltage value applied to the rechargeable battery is changed.
For example, when the voltage applied to the series of secondary batteries is changed between 2 and 3 (such as 3 V and 5 V, respectively), the current flowing through the secondary battery becomes excessive. That is, overcurrent was prevented from flowing, and unnecessary heat generation in the secondary battery to be charged could be suppressed.

It should be noted that the determination of the end of charging of the secondary battery in this type of charging apparatus is usually determined on the basis of the elapsed time (for example, 30 minutes from the start of charging) of the charging operation. In the embodiment of the present invention, the end of the charging can be known by the above-described operation of the charging determination circuit 7.

FIG. 3 is an exemplary view of a related device of the present invention. In FIG. 3, in order to rectify a voltage from a commercial power supply of AC 100 V, for example, a full-wave rectifier circuit 9 and A
Means including a C-DC converter 10 is provided, and a rectified voltage is applied to the DC-DC converter 4 here. Except for the addition of such rectifying means, the configuration is the same as that of the embodiment apparatus of the present invention shown in FIGS. 1 and 2, and further detailed description is omitted. With the configuration of the related device, in a place where a commercial power supply can be used, there is no need to turn the rotating handle to generate power, and the convenience is improved accordingly.

[0031]

As described above, the hand-held portable charging device according to the present invention has a simple structure and is inexpensive in cost, but can be used in emergency situations in mountainous areas. The charging of the portable device in is surely executed manually. In addition, since a connecting means for a commercial power supply can be provided, there is also a convenience that, when used in an urban area or the like, there is no need to turn a rotating handle to generate power.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a manual portable charging device 100 according to one embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of the apparatus according to the embodiment of the present invention;
FIG. 3 is an exemplary diagram of a circuit arrangement after a C-DC converter 4;

FIG. 3 is an explanatory diagram of a related device of the present invention.

[Explanation of symbols]

 1: Rotating handle 2: Gear box (transmission unit) 3: DC generator 4: DC-DC converter 5: Output adjustment resistor 6: Output changeover switch 7: Charge determination circuit (voltage detection circuit) 8: Battery for charging Box 100: Manual portable charging device

Claims (2)

[Claims] 1. A manual rotatable handle, a generator for generating a voltage by rotating the handle, a constant voltage circuit for converting a voltage generated by the generator to a constant voltage, and an output from the constant voltage circuit. And a detection circuit for detecting a predetermined voltage value or current value applied to the secondary battery to be charged. The constant voltage circuit is a step-down DC
A manually operated portable type, comprising: a DC converter, wherein the detection circuit also serves as a display circuit for judging the end of charging of the secondary battery to be charged and displaying a corresponding charge display. Charging device. And a changeover switch for changing a charge amount of the rechargeable battery to be charged in multiple stages, wherein the manual rotary handle, a generator, a constant voltage circuit, an output terminal,
The manual portable charging device according to claim 1, wherein the charging device is housed in the same case together with a charging display circuit and the like.