JPS6311874Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a charging device that switches between two indicators to indicate when a secondary battery is being charged and when charging has ended.

[Prior Art] Conventionally, this type of charging device uses two sets of switching transistors to switch the lamp.
Disclosed are devices that individually display when a storage battery is being charged and when charging has ended (for example, Utility Model Application No.
Publication No. 93939).

[Problems to be solved by the invention] However, the charging status display in such a charging device does not assume the case where a load such as a motor is driven during charging operation such as an electric shaver, and is simply displayed via a switch. If the battery is simply connected to the load, the same display as when charging will be displayed, and the charging display will continue even when the load is being driven but not being charged, giving the operator a clear indication even when the load is being driven. There is a possibility that the user may misunderstand that charging is being performed.

The present invention was developed in view of this problem, and by providing a display that immediately responds to the operating status of the charging device, it is possible to provide appropriate information to the operator and prevent erroneous operations caused by misinterpretation of the display. The purpose is to provide a charging device with

[Means for Solving the Problems] FIG. 1 is a schematic diagram showing the basic configuration of the charging device according to the present invention.
The secondary battery 3 and the current-carrying ends A and B of the switching element 21 are connected in series. This switching element 21 turns on and off between the current-carrying ends A and B depending on the presence or absence of a control current input to the control end C, thereby making it possible to regulate the charging timing from the power supply section 1 to the secondary battery 3.

Furthermore, a first display element 22 is interposed in the current-carrying circuit 17 that connects the control terminal C of the switching element 21 to the control terminal C of the switching element 21, and a first display element 22 that can display the charging time by passing the control current is inserted between the current-carrying terminals A and B of the switching element 21. A second display element 25 is interposed in the energizing circuit 16 provided in parallel with the energizing circuit 16, which allows a supplementary charging current to flow at least to the secondary battery 3 when the switching element 21 is off, thereby displaying the supplementary charging time. There is.

In addition to the above configuration, the present invention is characterized in that it includes a switch 15 that regulates the timing of energizing the load 14 such as a motor. The switch 15 is configured to connect the secondary battery 3 and the load 14 in conjunction with the ON operation, and to short-circuit both ends of the current supply circuit 16 to the second display element 25.

[Function] With the above configuration, when it is time to charge the secondary battery 3, the control current _I2 flows through the first display element 22 to display the charging time, as shown in FIG.
The current-carrying circuit 16 including the display element 25 is short-circuited between the current-carrying ends A and B of the switching element 21, and does not perform any display.

Next, at the supplementary charging time, as shown in FIG.
The current-carrying terminals A and B of the switching element 21, which had been short-circuited, are opened, and the auxiliary charging current _I3 flows to the second display element 25 to perform display operation, and the output power from the power supply unit 1 is small. Indicates the status.

When the switch 15 is turned on in such an auxiliary charging state, as shown in FIG. Drive the load. At the same time, the switch contacts 31 and 32 forcibly short-circuit both ends of the current-carrying circuit 16 including the second display element 25, stop supplying electricity to the second display element 25, stop the display, and switch from the auxiliary charging state to the high power state. This indicates that the load drive state has changed to one that consumes .

Note that when the switch 15 is turned on during charging as shown in FIG. ₂
The first display element 22 maintains the display operation as it is because it has no effect on the display. This state is basically a load driving state, but if the load becomes lighter, charging will continue, so the first
The display element 22 displays an activated charging state to inform the operator that charging is being performed at the same time as the load is being driven.

Further, when the switch 15 is turned off from the load drive state in which the switch 15 is turned on, the display states of the first and second display elements 22 and 25 return to the state before the switch 15 was turned on.

[Example] FIG. 3 is an electric circuit diagram specifically showing the configuration of the charging device according to the present invention, which includes a power supply unit 1 that converts a commercial AC voltage into a predetermined charging voltage, and a battery such as a nickel-cadmium battery. A charging unit 4 that regulates on/off the charging current I ₂ flowing into the secondary battery 3 and displays a display corresponding to the charging status, a timer unit 5 that controls the charging timing of the charging unit 4, and a load 1 of the charging device.
4 and an on/off switch 15 that can regulate the timing of energization of the motor.

The power supply unit 1 includes a rectifier 6 that converts a commercial AC voltage into a full-wave rectified voltage, and an inverter circuit 7 that converts the pulsating voltage generated by the rectifier 6 into a predetermined charging voltage. The rectifier 6 performs full-wave rectification of the commercial AC voltage using a diode bridge 8 , and then inputs the resulting voltage to the inverter circuit 7 via a filter circuit 9 .

The inverter circuit 7 intermittents the input full-wave rectified voltage with a transistor 10, converts it into a signal with a frequency sufficiently higher than the commercial frequency, and at the same time steps down the voltage with a transformer 11, thereby efficiently converting the commercial voltage into a predetermined charging voltage. possible.

The timer section 5 includes a pulse oscillation circuit and a counter, and uses the counter to count the number of pulses of the pulse signal generated by the oscillation circuit from the start of charging, and when it reaches a preset count, controls the charging section 4. A signal _S1 is sent to stop charging the secondary battery 3. In this embodiment, the time constant of the CR circuit 12 is adjusted to cause slow oscillation of about one pulse every two seconds, and the counter outputs a positive voltage control signal S ₁ at the same time as the current is turned on. By changing the control signal _S1 from a high state to a low state by counting several thousand pulses, charging control over a long period of about 8 hours is possible.

The charging unit 4 connects the negative terminal of the secondary battery 3 to the collector end of an NPN transistor 21 provided as a switching element via the protective resistor 20, and connects the positive terminal of the secondary battery 3 to the positive terminal of the power supply unit 1. The emitter terminal of the transistor 21 is connected to the negative side output terminal of the power supply section 1, respectively. Further, the base end of the transistor 21 is connected to the output end 13 of the timer section 5 via a red light emitting diode 22 provided as a first display element for displaying charging time, and a positive voltage control signal is sent to the base end. When S ₁ is applied, a base current I ₂ is applied to the light emitting diode 22 to cause a light emitting display, and at the same time, conduction occurs between the collector and emitter, and a charging current I ₁ is applied to the secondary battery 3 to start charging. .

Furthermore, it is equipped as a switching element.
The collector end of the NPN transistor 23 is connected to the positive output end of the power supply section 1, and the emitter end is connected to the protective resistor 2.
4 and a green light emitting diode 25 provided as a second display element, the negative side output terminal of the power supply unit 1 is connected to the negative side output terminal, and the base terminal is connected to the collector side of the transistor 21 described above.

Therefore, during the charging period when the transistor 21 is on, the base voltage of the transistor 23 is extremely low, and the transistor 23 is turned off to stop the power supply to the light-emitting diode 25, so that the light-emitting diode 25 continues to be turned off. However, the control signal _S1 output from the timer section 5 changes from a high state to a low state, and the transistor 2
The base current I ₂ of 1 disappears, turning off the collector-emitter terminals of the transistor 21, and at the same time, the light emitting display of the light emitting diode 22 is stopped. At the same time, the supplementary charging current I3 to the secondary battery ₃ flows into the transistor 23 as a base current, turning on the collector-emitter of the transistor 23, and
The light emitting diode 25 is energized to produce a green light-emitting display to inform the operator that charging has been completed and a supplementary charging state has been entered.

The present invention is characterized by the configuration of the switch 15 provided between the load 14 and the charging section 4.

The switch 15 has the first, second and third switches which are always open.
The contact points 31, 32, and 33 are short-circuited to each other in conjunction with the ON operation of the switch 15, and the first contact point 31 is connected to the transistor 21.
The second contact 32 is connected between the secondary battery 3 and the resistor 20, the third contact 33 is connected to one end of the load 14, and the other end of the load 14 is connected to the positive terminal of the secondary battery 3. ing.

Therefore, at the same time as the switch 15 is turned on, the load 14 is connected to both ends of the secondary battery 3 and the power supply section 1 and starts to be driven. At this time, when the secondary battery 3 is in the auxiliary charging period, the green light emitting diode 25 lights up to indicate that it is in the auxiliary charging state, but at the same time the switch 15 is turned on, the secondary battery 3 The negative pole and the cathode of the light emitting diode 25 are forcibly short-circuited between the first and second contacts 31 and 32, bypassing the base current _I3 flowing through the transistor 23, turning off the transistor 23, and turning off the light emitting diode. 25 is turned off to let the operator recognize that the state has changed from the auxiliary charging state to the high power consumption state.

On the other hand, when the switch 15 is turned on during the charging period, the transistor 21 is turned on and the light emitting diode 25 is turned off, so the light remains off even after the switch 15 is turned on. Since the light emitting operation is regulated only by the output from the timer section 5 and is not related to the switch operation, the light emitting display continues as it is, and a large amount of power is consumed. However, when the load 14 becomes lighter, the secondary battery 3 This notifies the operator that the mode also allows charging.

Note that if the current required to drive the second display element 25 is small, the switching element 23 may not be used and the display element may be driven only with the supplementary charging current _I3 of the secondary battery 3.

[Effects of the invention] As described above, the present invention includes the first display element 22 for displaying during charging and the second display element 25 for displaying during auxiliary charging.
and by interposing the first display element 22 on the control end side of the switching element 21, a charging in progress display is displayed whenever the secondary battery 3 is not fully charged. On the other hand, the second display element 25 is inserted in a circuit through which the auxiliary charging current flows to make it possible to display the auxiliary charging, and when driving a load, it can be short-circuited by the switch 15 to forcibly stop the display. This has many advantages, such as a display that appropriately corresponds to the driving state of the charging device, and erroneous operations caused by misunderstandings by the operator are prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the basic structure of the present invention, and FIGS. 2 a to 2 c are explanatory diagrams showing the operation of FIG. 1. FIG. 3 is an electrical circuit diagram showing an example of implementing the present invention. 1...Power supply part, 3...Secondary battery, 4...Charging part, 14...Load, 15...Switch, 21...
Switching element, 22...First display element, 25
...Second display element, 31...First contact, 32...
2nd contact, 33...3rd contact.

Claims (1)

[Claims for Utility Model Registration] (1) The secondary battery 3 and the current-carrying terminals A and B of the switching element 21 are connected in series to the output terminal of the power supply section 1, and the power is input to the control terminal C of the switching element 21. This is a charging device that regulates the charging timing of the _secondary battery 3 by turning on and off between current-carrying ends A and B of a switching element 21 depending on the presence or absence of a control current I2, and the charging device is installed on the control end C side of the switching element 21. , a first display element 22 that can display the charging time by passing the control current I ₂ , and a current-carrying circuit 16 that is provided in parallel with the current-carrying terminals A and B of the switching element 21, and a first display element 22 that can display the charging time by passing the control current I 2 . A second display element 25 that can display the auxiliary charging time by flowing at least the auxiliary charging current _I3 to the secondary battery 3 at the time;
A charging device equipped with a switch 15 that connects the switch 15 and short-circuits the energizing circuit 16 to the second display element 25. (2) The energizing circuit 16 connects the base end of the transistor 23 to the secondary battery 3 and the switching element 21.
In addition, a second display element 25 is connected to the emitter end side, and when the switching element 21 is off, the auxiliary charging current _I3 of the secondary battery 3 flows as a base current. The charging device according to item 1.