JPH0731056A - Power supply and separated power supply information unit - Google Patents

Abstract

PURPOSE:To prevent failure due to short circuit between the output terminals by providing a power supply generating means, an output switch, a power switch, a connection confirming means, and a switching limiting means. CONSTITUTION:Power generated from a power supply generating means 4 is fed to the body section through an output switch 5. The output switch 5 is operated by a user through a power switch 2. A connection confirming means 1 is activated when the body section is connected with the power supply section. A switching control means 3 controls the output switch 5 depending on the output state of the means 1. When the body section is disconnected from the power supply section and the means 1 is inactive, the switching control means 3 locks the output switch 5 in OFF state and thereby the user can not operate the output switch 5. When the means 1 is active, the user can operate the output switch 5 through the power switch 2. This constitution can prevent the failure due to short circuit between the output terminals 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply separation type information equipment in which a power supply unit can be separated, and more particularly to improvement of a power supply control method.

[0002]

2. Description of the Related Art A block diagram of a conventional power supply device is shown in FIG.
Shown in. The power generated by the power generation unit 4 is supplied from the power output terminal 6 to the external device through the output switch 5. The power switch 2 is a switch operated by the user. In the conventional power supply device, when the user operates the power switch 2, the output switch 5 inside the power supply device is turned on regardless of the state of the power output terminal 6, and power is output from the power output terminal 6. .

[0003]

However, in the conventional method, the main body part is separated from the power supply part and the power supply output terminal 6 is provided.
Since a voltage is generated at the power supply output terminal 6 even when is exposed, there is a risk that an accident such as smoke and ignition may occur due to a short circuit between the terminals.

[0004]

[Means for Solving the Problems] (1) In a power supply device used in a power source separation type information device or the like with a removable power source unit, a power source generating unit for generating a power source necessary for a main body unit, and a power source output to the outside. A power switch operated by a user, a connection confirmation means for confirming a connection state between the power supply section and the main body section, and a switching control for controlling the operation of the output switch according to the output state of the connection confirmation means. It is characterized in that a control means is added.

(2) In a power-separated type information device having a detachable power source section, a power source control signal line for transmitting two or more types of information from the main body section to the power source section by one signal line, and a built-in main body section, A voltage drop unit that drops the voltage level of the power supply control signal line, a voltage comparator that compares the voltage level of the power supply control signal line with a reference voltage level, a power supply generation unit that creates a power supply necessary for the main body, and an external unit. It has an output switch for switching the power supply output to the power supply and a switching control means for controlling the operation of the output switch according to the output state of the voltage comparator.

[0006]

The power generated by the power generating means is supplied to the main body through the output switch. The user opens and closes the output switch by operating the power switch. The connection confirmation means becomes active when the main body and the power supply are connected. The switching control means controls the output switch according to the output state of the connection confirmation means. When the main body unit and the power supply unit are separated and the connection confirmation unit is inactive, the switching control unit fixes the output switch in the OFF state, and the user cannot open or close the output switch. When the connection confirmation means is active, the user can open and close the output switch by opening and closing the power switch.

The power supply control signal line is a single signal line for transmitting two pieces of information, that is, connection information and a control signal to be controlled inside the power supply unit, from the main body unit to the power supply unit.

[0008]

(Embodiment 1) FIG. 1 shows a block diagram of a power supply section in a power supply separation type information equipment for carrying out claim 1 of the present invention. The power-separated information device can be separated into a power supply unit on the power supply side and a main body unit equipped with an information processing function. The power generation means 4 generates the power required for the main body. The output switch 5 controls whether or not the output of the power generation means 4 is supplied to the main body. When the output switch 5 is turned on, power is output from the power output terminal 6. In this embodiment, as the output switch 5, a semiconductor switch that turns on when a high level is input to the control terminal is used. The power switch 2 is turned on by a user operation when power is supplied to the main body. When the power switch 2 is turned on, it outputs a high level. The output of the connection confirmation means 1 becomes high level when the power output terminal 6 is connected to the power input terminal of the main body. The switching control means 3 controls whether or not output control by the power switch 2 is possible depending on the output state of the connection confirmation means 1. The switching control means 3 is composed of a negative logic OR circuit, and when either one of the connection confirmation means 1 and the power switch 2 becomes low level, the output becomes low level. Therefore, when the main body and the power supply are separated and the output of the connection confirmation means 1 becomes low level, the output of the switching control means 3 is fixed at low level and the output switch 5 is fixed at off state.

A concrete circuit diagram in which the connection confirmation means 1, the power switch 2 and the switching control means 3 are combined is shown in FIG.
Shown in. The switch 8 embodies the power switch 2.
The photo interrupter 7 embodies the connection confirmation means 1. The switching transistor 3 is embodied by the output transistor of the photo interrupter 7 and the switch 8. The photo interrupter 7 turns on the output transistor when there is no shield between the LED and the output transistor, and
If there is a shield between the ED and the output transistor, the output transistor is turned off. When the output transistor of the photo interrupter 7 is off, the switch 8
When the switch is short, a low level is output from the switching control means output terminal 9, and when the switch 8 is open, a high level is output from the switching control means output terminal 9. When the output transistor of the photo interrupter 7 is on, the switching control means output terminal 9
Output is fixed to low level.

FIG. 3 shows an example of the outer shape of a power source separation type information device using the power supply device embodying the present invention as a power source section.
Shown in. A protrusion 34 is provided on a part of the main body 10 to
The projection 34 of the main body 10 is inserted between the LED and the phototransistor of the photointerrupter 7 when the power input terminal 0 of 0 and the power output terminal of the power supply 11 are completely connected. With such a structure, the output transistor of the photo interrupter 7 is turned on when the main body 10 of the power-separated information device is separated from the power supply 11. As a result, the signal level output from the switching control means output terminal 9 in FIG. 2 is fixed at a low level and the output switch 5 is turned off regardless of the state of the switch 8. When the power supply unit 10 and the main body unit 11 are connected and the output phototransistor of the photo interrupter is turned off, the switch 8 can operate the output switch 5.

By carrying out the above-mentioned matters,
When the main unit is removed from the power supply unit of the power supply separation type information equipment and the power supply output terminal is exposed, the power supply cannot be output and no accident due to a short circuit between the output terminals occurs.

In this embodiment, the photo interrupter is used to confirm the connection, but a mechanical switch such as a push switch can be used as a means for confirming the connection.

(Embodiment 2) FIG. 4 shows another embodiment for carrying out claim 1 of the present invention. This embodiment shows an example in which a method of inputting a connection confirmation signal from the main body is used as the connection confirmation means. When the power supply unit and the main body unit are connected, a high level potential, that is, a potential high enough to turn on the connection confirmation transistor 32 is input from the connection signal input terminal 31 from the main unit. When the main body and the power supply are separated, the connection signal input terminal 31 is in an open state. Therefore, the connection confirmation transistor 32 is turned off and the connection confirmation transistor 33 is turned on. As a result, the signal level output from the switching control means output terminal 9 is fixed at a low level and the output switch 5 in FIG. 1 is turned off regardless of the state of the switch 8. When the power supply unit and the main body unit are connected and a high-level potential is input from the connection signal input terminal 31, the connection confirmation transistor 32 is turned on and the connection confirmation transistor 33 is turned off. As a result, it becomes possible to operate the output of the switching control means output terminal 9 by the switch 8, and the output switch 5 can be operated.

This embodiment makes it possible to carry out the present invention without complicating the exterior.

(Embodiment 3) A block diagram of an embodiment for carrying out claim 2 of the present invention is shown in FIG. The present embodiment is an example in which connection confirmation is performed according to the voltage level of a signal line connecting the main body of the power source separation type information device and the power supply unit, and the control target signal line also controls other control targets. CPU19
Not only performs information processing in the main body, but also controls the power supply. The second power supply generation means 16 generates a power supply having a voltage level different from that of the power supply generation means 4. The second power output terminal 18 supplies power to peripheral equipment connected to the power separation type information equipment. The second output switch 17 switches the power supply to the second power output terminal 18. As the second output switch 17, a semiconductor switch that is turned on when a low level is input to the control terminal is used. Power control signal line 13 is C
A signal line for transmitting information from the PU 19 to the power supply unit 10. By setting the voltage level of the power supply control signal line 13 to a low level, the second output switch 17 is turned on and the peripheral device is connected from the second power supply output terminal 18. Power is supplied to.

The power supply control signal line 13 conveys three levels of voltage levels of high level, intermediate level and low level.
The voltage generation means 15 generates a high level of the power supply control signal line 13. When the main body unit 10 and the power supply unit 11 are separated, the voltage level of the power supply control signal line 13 becomes high level. The voltage drop means 12 controls the voltage level of the power supply control signal line 13 so as not to be higher than the intermediate level. Therefore, when the main body unit 10 and the power supply unit 11 are connected, the voltage level of the power supply control signal line 13 drops to an intermediate level. The voltage comparator 14 detects whether the voltage level of the power supply control signal line 13 is high level. When the voltage level of the power supply control signal line 13 is high level, the output of the voltage comparator 14 becomes low level. As a result, the output of the switching control means 3 is fixed at a low level and the power switch 2 cannot be operated. The intermediate level potential sets the potential at which the second output switch 17 is turned off.

A concrete circuit diagram of the block diagram shown in FIG. 5 is shown in FIG. When the main body unit 10 is separated from the power source unit 11, the power source control signal output terminal 21 and the power source control signal input terminal 2
2, the power supply output terminal 6 and the power supply input terminal 28 are also separated. The voltage generator 15 is embodied by the resistors 29 and 30. By dividing the power potential by the resistor 29 and the resistor 30, a potential of 9 V is created as a high level potential and is input to the negative input terminal of the voltage comparator 23. The reference voltage V is applied to the positive input terminal of the voltage comparator 23.
Input 7.5V as ref. Therefore, when the potential of the power supply control signal line 13 becomes high level of 9 V, the output of the voltage comparator 23 becomes low level. Since the output of the voltage comparator 23 is an open collector output, it can be combined with other transistors to form a wired OR circuit. In this embodiment, the output of the voltage comparator 23 and the collector of the transistor 24 are connected to form a wired OR circuit, and the switching control means 3 is embodied. When the power control signal input terminal 22 is opened, the potential of the power control signal line 13 becomes 9V. Therefore, the output transistor of the voltage comparator 23 is turned on, the transistor 25 is fixed in the off state, and the output FET 26 is also turned off. as a result,
The state of the switch 8 is ignored.

The Zener diode 20 operates so that the voltage level of the power supply control signal output terminal 21 becomes 5.6 V or less. When the main body unit 10 and the power supply unit 11 are connected, the power supply control signal output terminal 21 and the power supply control signal input terminal 22 are connected, and the potential of the negative input terminal of the voltage comparator 23 drops to 5.6V by the operation of the Zener diode 20. To do. Therefore, the potential of the negative input terminal of the voltage comparator 23 becomes lower than the potential of the positive input terminal, and the output transistor of the voltage comparator 23 is turned off. As a result, due to the switching operation of the switch 8, the output FET
26 can be switched. The peripheral device power supply generated by the second power supply generation means 16 is output F
It is supplied to the peripheral device from the second output terminal 18 through the ET 27. The peripheral circuit of the output FET 27 is turned on when 0V which is a low level is input, but is not turned on when 9V which is a high level and 5.6V which is an intermediate level. As a result, the CPU 19 is turned on only when the power supply control signal outputs 0V.

The connection confirmation between the main body and the power supply can be realized by sending information from the main body to the power supply. However, in reality, in order to rationalize by reducing the number of pins of the connection connector, it is often impossible to provide a signal line only for confirmation of connection. In such a case, the connection can be easily confirmed by transmitting two pieces of information with one signal line as in the present invention. Further, by transmitting three or more kinds of potentials with one signal line, it is possible to control a plurality of control targets other than the connection confirmation.

The embodiment described above is one example for carrying out the present invention, and the signal logic, the combination of the transistors, the connection confirmation method, etc. can be selected by an optimum method according to the system for carrying out the present invention. Good.

[0021]

By implementing the present invention and providing the connection confirmation means, the power supply is not output from the exposed power supply output terminal. Therefore, smoke and fire due to short-circuiting between terminals and accidents such as electric shock to the user are eliminated, and safety is greatly improved. In addition, the reliability of the product is improved as the safety is improved. Further, by providing the power supply control signal line, the connection between the power supply unit and the main body unit can be confirmed with a simpler configuration without complicating the exterior. Furthermore, since the connection information and the two pieces of control signal information are transmitted by one power supply control signal line, the number of signal lines can be reduced and the number of pins of the interface connector can be reduced. As a result, the component cost can be reduced and the cost of the entire product can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a power supply device embodying claim 1 of the present invention.

FIG. 2 is a circuit diagram showing a specific embodiment of claim 1 of the present invention.

FIG. 3 is an external view of a power supply device embodying claim 1 of the present invention.

FIG. 4 is a circuit diagram showing another specific embodiment of claim 1 of the present invention.

FIG. 5 is a block diagram of a power source separation type information device that implements claim 2 of the present invention.

FIG. 6 is a circuit diagram showing a specific embodiment of claim 2 of the present invention.

FIG. 7 is a block diagram of a conventional power supply device.

[Explanation of symbols]

 1, connection confirmation means 2, power supply switch 3, switching control means 4, power supply generation means 5, output switch 6, power supply output terminal 7, photo interrupter 8, switch 9, switching control means output terminal 10, power supply separation type information equipment Main body part 11, power supply part 12 of power supply separation type information equipment, voltage drop means 13, power supply control signal line 14, voltage comparator 15, voltage generation means 16, second power supply generation means 17, second output switch 18 , Second power output terminal 19, CPU 20, Zener diode 21, power control signal output terminal 22, power control signal input terminal 23, voltage comparator 24, transistor 25, transistor 26, output FET 27, output FET 28, power input Terminal 29, resistor 30, resistor 31, connection signal input terminal 32, connection confirmation transistor 33 Connection confirmation transistor 34, the projection of the power supply separating type information apparatus main body

Claims (2)

[Claims] 1. A power supply device for use in a power source-separated information device or the like having a removable power source unit, a power source generating unit for generating a power source required for a main body unit, and an output switch for switching a power source output to the outside. The power switch operated by the user is provided with connection confirmation means for confirming the connection state between the power supply section and the main body section, and switching control means for controlling the operation of the output switch according to the output state of the connection confirmation means. Characteristic power supply device. 2. A power source separation type information device having a detachable power source section, and a power source control signal line for transmitting two or more types of information from the main body section to the power source section by one signal line, and the power source built in the main body section. A voltage drop unit for dropping the voltage level of the control signal line, a voltage comparator for comparing the voltage level of the power supply control signal line with a reference voltage level, a power source generation unit for generating a power source required for the main body unit, and an external unit. 2. A power-separated information device, comprising: an output switch for switching the power output of the power supply; and a switching control means for controlling the operation of the output switch according to the output state of the voltage comparator.