JPH066679Y2 - Power supply circuit controller - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention is an AC adapter for converting a commercial power source into a direct current power source, a power source suitable for a device using a dry battery which is a non-rechargeable battery and a rechargeable battery. The present invention relates to a control device for a circuit.

(B) Conventional technology An audio device called a headphone stereo, which is designed to listen to a signal reproduced from a magnetic tape by a headphone, is popular, but since such a device is often used outdoors, it is used as a power source. Batteries are used. Such an audio device is required to be ultra-miniaturized, but in that case, the size of the battery becomes a problem, and recently, in order to solve such a problem, a device using a special shape, for example, a rectangular rechargeable battery. Is being developed. In addition, such an audio device can be used by a DC power supply supplied from an AC adapter that converts a commercial AC power supply into a DC power supply when used indoors, and is charged by a current supplied from the AC adapter. It is designed to perform the charging operation of a rechargeable battery, and as such a technique, for example, the Japanese Utility Model Publication No. 61-14
There is one disclosed in Japanese Patent No. 9939.

(C) Problems to be Solved by the Invention The above-mentioned publication discloses a technique for performing a power supply operation to a load by a DC power supply supplied from an AC adapter and a charging operation for a rechargeable battery. According to this, the device body can be miniaturized by making the shape of the rechargeable battery special, but the capacity of the rechargeable battery becomes smaller with the downsizing of the battery, so that the battery usage time becomes shorter. There is a problem. The present invention aims to provide a control device for a power supply circuit, which is improved in this respect.

(D) Means for Solving the Problems The control device of the present invention is an AC for step-down rectifying a commercial AC power supply.
An apparatus main body provided with a power jack into which a plug for an AC adapter for outputting a DC voltage obtained from an adapter is provided, and an accommodating portion detachably attached to the apparatus main body and accommodating a dry battery is formed. A battery housing, a battery plug that is formed in the battery housing and that outputs a DC voltage obtained from a dry battery, and that is inserted into the power jack when united with the device body; and the power jack. A positive terminal and a ground terminal which are configured to come into contact with the positive terminal and the negative terminal of the plug when the plug for the AC adapter or the plug for the battery is inserted, and the power jack and the plug for the AC adapter or the battery. From the positive terminal of the power jack and the switching contact that is separated from the ground terminal when the power plug is inserted. A load to which DC power is supplied via a power source switch, a rechargeable battery housed in the device body and connected between the positive electrode terminal and the switching contact piece, and the switching contact piece and ground A charging resistor connected between the charging resistor and the charging resistor for limiting the charging current of the rechargeable battery, and connected between the switching contact piece and the ground and when the battery container and the device body are united. It is composed of a changeover switch which is pressed and closed by a changeover projection formed on the battery container.

(E) Action The present invention is directed to the switching projection formed on the battery housing when the battery plug is inserted into the power jack by the combination of the device housing housing the rechargeable battery and the battery housing. A reversible switch and a dry battery are connected in parallel by providing a changeover switch that is closed by pressing and closing both ends of the charging resistor by closing the changeover switch.

(F) Embodiment The circuit shown in FIG. 1 is an embodiment of the power supply circuit according to the present invention, FIG. 2 is a perspective view showing the relationship between the device body and the battery housing, and FIG. 3 is the device body. FIG. 4 is a cross-sectional view of the main part showing the relationship with the battery container, and FIG. 4 is a cross-sectional view of the main part showing the state in which the device body and the battery container are combined. In FIG.
(1) is a device body of an audio device in which a drive mechanism of a tape recorder, an amplifier circuit and the like are incorporated, and (2) is a housing part (4) in which a dry battery (3) is housed and the device body is formed.
It is a battery container used in combination with (1),
Battery plug that outputs the DC voltage obtained from (3) (5)
And a switching projection (6). (7) is for the power supply which is formed on the lower surface (8) of the device body (1) and into which the AC adapter plug for outputting the DC voltage obtained from the battery plug (5) and the AC adapter is inserted The through hole (9) is formed on the lower surface (8) of the device body (1), and the switching projection (6) is formed when the battery container (2) is united with the device body (1). It is a switching through hole to be inserted.
In FIG. 1, ( 10 ) is arranged at a position corresponding to the power supply through hole (7) in the device body (1), and the battery plug (5) and the AC adapter plug are inserted. Power supply jack, which is disconnected from the ground terminal (12) when the positive terminal (11), the ground terminal (12) that is grounded, and the battery plug (5) or the AC adapter plug is inserted. It is provided with a switching contact piece (13) which is separated. (14)
Is a power switch, and (15) is a load such as an electric motor and an amplifier circuit that configures the tape recorder, and the power jack ( 10 )
It is connected so that a DC power is supplied from the positive electrode terminal (11) via the power switch (14). (16) is a rechargeable battery housed in the device body (1), the positive terminal of which is connected to the positive terminal (11) of the power jack ( 10 ) and the negative terminal of which is It is connected to the switching contact (13). (17) is a switching contact piece (13) of the power jack ( 10 )
That is, it is a charging resistor connected between the negative terminal of the rechargeable battery (16) and the ground, and has a function of limiting the charging current during the charging operation of the rechargeable battery (16). (18) is between the switching contact piece (13) of the power jack ( 10 ) and the ground, that is, the charging resistor
It is a changeover switch connected in parallel with (17), and it is a battery plug by combining the device body (1) and the battery housing (2).
When (5) is inserted into the power jack ( 10 ) the battery compartment
It is related so as to be closed by inserting the switching projection (6) formed in (2) into the switching through hole (9).
(19) is a printed circuit board which is fixed in the device body (1) and has a power supply circuit and an amplifier circuit incorporated therein, and the power supply jack ( 10 ) and the changeover switch (18) are shown in FIG. It is fixed by soldering as shown in. Further, (20) and (21) shown in FIG. 2 and FIG.
(2) is a mounting projection that is inserted into a mounting hole (not shown) formed in the device body (1) when it is united with the device body (1). It has the effect of being attached and fixed to the device body (1). The control device of the present invention is configured as described above, and the operation will be described below.

First, the power supply operation by the AC adapter will be described. When the AC adapter plug provided on the AC adapter is inserted into the power jack ( 10 ), the positive terminal and the negative terminal provided on the plug are connected to the positive terminal (11) and the positive terminal (11) provided on the power jack ( 10 ). The switching contact piece (13) is grounded to the ground terminal (12) and separated from the ground terminal (12). In such a state, the direct current obtained from the AC adapter is the positive terminal (11), the rechargeable battery (16), the charging resistor.
(17), the ground wire and the ground terminal (12) through the rechargeable battery (1
6) and the charging operation of the rechargeable battery (16) is performed. The charging resistor (17) is set so that an excessive current does not flow to the rechargeable battery (16) during the charging operation. In this way rechargeable batteries
Although the charging operation of (16) is performed, when the power switch (14) is closed in such a state, the DC power obtained from the AC adapter is passed through the power switch (14) to load (15).
The tape recorder can be used to perform each operation. Then, in such a state, if the capacity of the AC adapter is set in consideration of the capacity of the load (15) and the rechargeable battery (14), the rechargeable battery (16) is operated while supplying power to the load (15). The charging operation of can be performed at the same time.

As described above, the power supply operation to the load (15) by the AC adapter and the charging operation of the rechargeable battery (16) are performed. Next, the power supply operation by the rechargeable battery (16) thus charged explain. When the AC adapter plug and the battery plug (5) are not inserted in the power jack ( 10 ), the switching contact piece (13) is in contact with the ground terminal (12), and the rechargeable battery (16) The positive terminal is connected to the positive terminal (11) and the negative terminal is grounded via the switching contact piece (13) and the ground terminal (12). When the power switch (14) is closed in such a state, the rechargeable battery
The DC power obtained from (16) is supplied to the load through the power switch (14), and each operation of the tape recorder can be performed.

The power supply operation is performed by the AC adapter and the rechargeable battery 16 as described above. Next, the operation when the dry battery is used will be described. Such operation is performed by accommodating the dry battery (3) in the accommodating portion (4) provided in the battery accommodating container (2) as shown in FIG. 2 and by accommodating the battery accommodating container (2) in the device body (1).
It is done by combining with. The battery container
When (2) is united with the device body (1), the battery plug (5) and the switching projection (6) provided in the battery container (2) are attached to the lower surface (8) of the device body (1). It is inserted into each of the formed power supply through hole (7) and switching through hole (9). The state shown in FIG. 4 shows such a state, in which the battery plug (5) is inserted into the power jack ( 10 ) and the changeover switch (18) is pushed by the pressing operation of the changeover protrusion (6). Is closed. When the battery plug (5) is inserted into the power jack ( 10 ), the positive terminal and the negative terminal provided on the battery plug (5) are connected to the positive terminal (11) provided on the power jack ( 10 ). ) And the grounding terminal (12) and the switching contact (13) is connected to the grounding terminal.
Separated from (12). Rechargeable battery when in such a state
Since the positive terminal of (16) is connected to the positive terminal (11) and the negative terminal is connected to the ground terminal (12) via the changeover switch (18) and the ground wire, the rechargeable battery ( 16) and batteries
(3) is connected to the load (15) in parallel. Therefore, when the power switch (14) is closed in such a state, the DC power obtained from the rechargeable battery (16) and the dry battery (3) is supplied to the load, and each battery (3) (1
6) It is possible to reduce the output current value. When the voltage of the rechargeable battery (16) is lower than the voltage of the dry battery (3) when such an operation is performed, the charging operation of the rechargeable battery (16) is performed by the current supplied from the dry battery (3). Will be done.

As described above, each operation is performed when the rechargeable battery (16) is housed in the device body (1).
With 6) removed from the device body (1), plug the AC adapter or battery plug into the power jack ( 10 ).
By inserting (5), the power supply operation to the load (15) can be performed without any trouble.

(G) Effect of the invention This invention is connected in series to the rechargeable battery during charging operation by the changeover switch that is closed when the battery plug is inserted into the power jack into which the AC adapter plug and the battery plug are inserted. It is characterized in that the rechargeable battery and the dry battery are connected in parallel by short-circuiting both ends of the charging resistor provided to limit the charging current. It has the advantage that the life of rechargeable batteries and dry batteries can be extended. Further, the changeover switch provided to short-circuit both ends of the charging resistor is closed by the changeover projection formed on the battery housing when the battery housing housing the dry battery is united with the device body. Therefore, the present invention is applied to the microminiaturized device in which the changeover switch is provided separately from the power supply jack, and therefore it is difficult to incorporate the changeover switch into the microminiature power supply device. It is extremely effective.

[Brief description of drawings]

The circuit shown in FIG. 1 is an embodiment of the power supply circuit according to the present invention, FIG. 2 is a perspective view showing the relationship between the device body and the battery housing, and FIG. 3 is a view showing the device body and the battery housing. FIG. 4 is a cross-sectional view of a main part showing the relationship, and FIG. 4 is a cross-sectional view of the main part showing a state in which the device body and the battery container are combined. Description of main drawing numbers (1) …… Main unit, (2) …… Battery compartment, (3) …… Batteries, (4) …… Storage compartment, (5) …… Battery plug, (6) ...... Switching protrusion, ( 10 ) …… Power jack, (11) …… Positive terminal,
(12) …… Grounding terminal, (13) …… Switching contact, (14) …… Power switch, (15) …… Load, (16) …… Rechargeable battery, (17) ……
Charging resistor, (18) …… Changeover switch.

Claims (1)

[Scope of utility model registration request] 1. A device main body provided with a power supply jack into which a plug for an AC adapter for outputting a DC voltage obtained from an AC adapter for step-down rectifying a commercial AC power supply is provided, and a device main body detachable from the device main body. And a battery container in which a storage part for storing dry batteries is formed,
A battery plug, which is formed in the battery container and outputs a DC voltage obtained from a dry battery, and which is inserted into the power jack when united with the main body of the device, and which constitutes the power jack and also for the AC adapter. When the plug or the battery plug is inserted, the positive terminal and the ground terminal that come into contact with the positive terminal and the negative terminal of the plug and the power jack are formed, and the AC adapter plug or the battery plug is inserted. A switching contact piece that is disconnected from the ground terminal at a certain time, a load to which direct current power is supplied from the positive terminal of the power jack via a power switch, and a switch that is housed in the device body and switches to the positive terminal. A rechargeable battery connected between the contact piece and the switching contact piece and ground, and a charging current of the rechargeable battery. The charging resistance is limited and the switching projection formed on the battery housing when the battery housing and the device body are connected to each other between the switching contact piece and the ground is pressed and closed. Control device for a power supply circuit, which comprises a changeover switch.