JP2001142577A - Power source supplying adapter, power unit, electronic instrument and power source supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To output a voltage current corresponding to an ID signal obtained from a power source supplying adapter having an impedance element from a power unit. SOLUTION: Mains power is supplied to an AC/DC switching power circuit Ra through a terminal Ti. Concerning a power circuit Ra, a DC/DC switching power circuit Rd, one of the voltage current of voltage current characteristics a/b is selected and outputted. The circuit Ra converts mains power supplied in accordance with a control signal from a control circuit 2 to voltage current. The circuit Rd converts the power source of a secondary battery BT in accordance with the control signal from the circuit 2 into voltage current. The voltage current from the circuit Ra and that from the circuit Rd are supplied to an external electronic instrument through a terminal To. An ID detection circuit 1 detects an ID signal transmitted through the terminal To. The circuit 2 controls the switching operation of the circuit Ra and the circuit Rd in accordance with the detected ID signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a technique for detecting an identification signal from a connector connected to supply power to an external electronic device, and controlling to supply a power corresponding to the detected identification signal. The present invention relates to a power supply adapter, a power supply unit, an electronic device, and a power supply system that can be used.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 21, there is a power supply unit 192 for converting a commercial power supply to a predetermined power supply and supplying power to a portable electronic device 191. The power supply unit 192 is provided with a power cable 193 for obtaining commercial power and a connector for connecting a power supply adapter 194 for supplying power to the electronic device 191. Further, the power supply unit 192 is provided with an AC / DC switching power supply circuit for converting a commercial power supply to a predetermined power supply. This power supply unit 1
Reference numeral 92 denotes a so-called AC adapter function of supplying predetermined power from a commercial power supply to the electronic device 191 and a so-called battery having a secondary battery in the main body and supplying predetermined power to the electronic device 191 from the secondary battery. Function. At this time, the voltage and current output from the power supply unit 192 have been determined.

In the case of a power supply unit 192 capable of outputting a plurality of types of voltages and currents, three terminals of a + terminal, a − terminal, and a communication terminal are provided between the electronic device 191 and the power supply unit 192.
Electronic equipment 191 and power supply unit 1
In some cases, an identification signal was transmitted between the two. This is because the electronic device 191 determines whether or not the power supply unit 192 can supply a correct voltage and current to the electronic device 191 and determines whether the electronic device 191 can supply the voltage and current output from the power supply unit 192. Is determined on the power supply unit 192 side. That is, both the electronic device 191 and the power supply unit 192 determine each of them, and output the corresponding voltage / current from the power supply unit 192 to the electronic device 191.

[0004]

However, the power supply adapter requires a communication line, and furthermore, both the power supply unit and the electronic device can output the identification signal and a circuit capable of confirming and judging the identification signal. There was a problem that had to be provided.

Accordingly, an object of the present invention is to eliminate a communication line from a power supply adapter, further eliminate the need for communication between the power supply unit and the electronic device, and output a power supply corresponding to the electronic device from the power supply unit. A power supply adapter, a power supply unit, an electronic device, and a power supply system are provided.

[0006]

According to an aspect of the present invention, there is provided a power supply adapter connected between a power supply unit for outputting a plurality of types of power and an electronic device. , A first connector provided with at least three terminals and connected to a connector of a power supply unit, a second connector provided with at least two terminals and connected to a connector of an electronic device, and a first and a second connector A first connector of the first connector, a first terminal of the second connector, a second terminal of the first connector, and a second connector of the second connector. Element having a value corresponding to the type of electronic device between the first or second terminal of the first connector and the third terminal of the first connector. Power supply unit When power is supplied to the impedance element from bets, a power supply adapter, characterized in that made it possible to generate an identification signal of the electronic device by the impedance element.

According to a third aspect of the present invention, there is provided a power supply unit for supplying a plurality of types of power to an electronic device via a power supply adapter, wherein the power supply adapter has at least three terminals. A first connector connected to the connector of the power supply unit, a second connector provided with at least two terminals and connected to the connector of the electronic device, and a cable connected to the first and second connectors. A first terminal of the first connector, and a second terminal
The first terminal of the first connector is connected to the first terminal of the first connector, the second terminal of the first connector is connected to the second terminal of the second connector, and the first or second terminal of the first connector is connected to the first terminal. , First
An impedance element having a value corresponding to the type of electronic device is provided between the third terminal of the connector and the electronic device when the power is supplied from the power supply unit to the impedance element. A voltage conversion means capable of generating a signal and selectively outputting at least one of a plurality of types of power supplies to an electronic device in a connected power supply unit; A power supply unit, comprising: a detection unit that detects the identified identification signal; and a control unit that controls the voltage conversion unit so as to output a power supply corresponding to the identification signal from among the plurality of types of power supplies. is there.

According to a sixth aspect of the present invention, in an electronic apparatus to which power is supplied from a power supply unit via a power supply adapter, an impedance element for generating an identification signal for identifying a power supply suitable for the power supply unit is provided. Is provided in a connector connected to a power supply adapter.

According to a seventh aspect of the present invention, in a power supply system in which a power supply adapter is connected when power output from a power supply unit is supplied to an electronic device, the power supply unit includes a plurality of types of power supplies. Voltage conversion means capable of selectively outputting at least one of them to the electronic device; detection means for detecting an identification signal generated in the power supply adapter; Control means for controlling the voltage conversion means so as to output the supplied power, the power supply adapter having at least three terminals, a first connector connected to a connector of the power supply unit, and at least two terminals. A second connector connected to the connector of the electronic device; and a cable connecting the first and second connectors. The first terminal of the first connector is connected to the first terminal of the second connector, the second terminal of the first connector is connected to the second terminal of the second connector, and the first connector An impedance element having a value corresponding to the type of the electronic device is provided between the first or second terminal of the first connector and the third terminal of the first connector, and power is supplied from the power supply unit to the impedance element. A power supply system characterized in that an identification signal of an electronic device can be generated by an impedance element when the power supply is performed.

[0010] An impedance element is provided in the connector of the power supply adapter. When power is supplied from the power supply unit to the impedance element, the impedance element outputs
The D signal is supplied to the power supply unit. In the power supply unit, an ID signal transmitted from the power supply adapter is detected, and power corresponding to the detected ID signal is supplied to the electronic device via the power supply adapter.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a first embodiment to which the present invention is applied. Commercial power is supplied to an AC / DC (meaning AC input DC output) switching power supply circuit Ra via a terminal Ti. AC /
The DC switching power supply circuit Ra can select and output one of the voltage / current characteristics a and b shown in FIG. In the AC / DC switching power supply circuit Ra, the commercial power supplied according to the control signal from the control circuit 2 is converted into one of the voltage-current characteristics a and b. The voltage / current output from the AC / DC switching power supply circuit Ra is supplied to an external electronic device via the switch circuit 3 and the terminal To.

The DC / DC (meaning DC input / DC output) switching power supply circuit Rd can select and output one of the voltage / current characteristics a and b. In the DC / DC switching power supply circuit Rd, the power supply of the secondary battery BT is converted into one of the voltage-current characteristics a and b according to the control signal from the control circuit 2. D
The voltage / current output from the C / DC switching power supply circuit Rd is supplied to an external electronic device via the switch circuit 3 and the terminal To.

The first terminal T1 of the terminal To is connected to the switch circuit 3, and outputs a voltage and a current. And terminal T
o, the second terminal T2 is grounded, and the third terminal T3 is
Connected to detection circuit 1.

The ID detection circuit 1 detects an ID signal (identification signal) transmitted via the terminal To, and supplies the detected ID signal to the control circuit 2. In the control circuit 2,
In order to output a predetermined voltage / current according to the transmitted ID signal, AC / DC switching power supply circuits Ra and D
The control signal for controlling the switching operation of the C / DC switching power supply circuit Rd is an AC / DC switching power supply circuit Rd.
a and the DC / DC switching power supply circuit Rd.

Specifically, when the voltage value Va of the ID signal is detected, the AC / DC switching power supply circuit Ra and the DC / DC switching power supply circuit Rd output the voltage / current of the voltage / current characteristic a shown in FIG. When the voltage value Vb of the ID signal is detected, the AC / DC switching power supply circuit Ra and the DC / DC switching power supply circuit Rd output the voltage / current of the voltage / current characteristic b. Thus, in the control circuit 2, the control of the AC / DC switching power supply circuit Ra and the control of the DC / DC switching power supply circuit Rd are switched according to the ID signal.

Here, some examples of a power supply adapter for supplying power to an external electronic device will be described with reference to FIG. In the power supply adapter shown in FIG. 3, the connector CP is connected to the power supply unit, and the connector CE is connected to the electronic device.

The power supply adapter shown in FIG. 3A is provided with terminals 11, 12 and 13 on a connector CP and terminals 14 and 15 on a connector CE. Terminal 11
And 14 are connected via a cable, and terminals 12 and 15 are connected via a cable. An impedance element, for example, a resistor R is provided between the terminals 12 and 13 on the connector CP side. As an example,
The value of the impedance element is appropriately selected and used in the range of 1 kΩ to 30 kΩ. The value of the resistor R is predetermined according to the electronic device in order to generate an ID signal of a desired voltage and current. For example, when power is supplied to a mobile phone, the value of the resistor R is set to 5 kΩ, and when power is supplied to a personal computer, the value of the resistor R is set to 10 kΩ, and power is supplied to the VTR-integrated digital camera. In this case, the value of the resistor R is 20
It is set to kΩ. Further, a capacitor or a coil may be used as an impedance element instead of the resistor R.

In the power supply adapter shown in FIG. 3B, terminals 16, 17 and 18 are provided on connector CP, and terminals 19 and 20 are provided on connector CE. Terminal 16
And 19 are connected, and terminals 17 and 20 are connected. A resistor R is provided between the terminals 17 and 18 on the connector CE side.

In the power supply adapter shown in FIG. 3C, terminals 21, 22 and 23 are provided on connector CP, and terminals 24, 25 and 26 are provided on connector CE. Terminals 21 and 24 are connected, terminals 22 and 25 are connected, and terminals 23 and 26 are connected. That is,
The power supply adapter shown in FIG. 3C does not have the resistor R and has a straight connection between terminals.

The electronic device E is provided with a connector that is connected to the connector CE of the power supply adapter. The connector is provided with terminals 27, 28 and 29. Terminals 24 and 27 are connected, terminal 25 and terminal 28 are connected, and terminals 26 and 29 are connected.
Then, on the electronic device E side, a resistor R is provided between the terminals 28 and 29.

As described above, the resistor R is provided in the connector CP or CE of the power supply adapter or the connector of the electronic device E. When the connector CP of the power supply adapter is connected to the power supply unit, an ID signal is transmitted to the power supply unit by a voltage value corresponding to the value of the resistor R provided. The transmitted ID signal is detected by an ID detection circuit. Then, a voltage / current corresponding to the voltage value of the detected ID signal is output from the power supply unit.

In the first embodiment described above, in order to generate power by either the AC input or the secondary battery BT, the AC / DC switching power supply circuit Ra and the DC / DC
And a switching power supply circuit Rd. However, in the first embodiment, since the voltage / current of the voltage / current characteristics a and b can be output from both the AC / DC switching power supply circuit Ra and the DC / DC switching power supply circuit Rd, the AC / DC switching power supply Only the circuit Ra may be provided, or only the DC / DC switching power supply circuit Rd may be provided. Therefore, a block diagram in which the AC / DC switching power supply circuit Ra is removed from the first embodiment shown in FIG. 1 is shown in FIG. 4, and the following description will be made with reference to a diagram showing only the DC / DC switching power supply circuit Rd. Further, the same blocks as those in FIG. 1 described above are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 shows a circuit diagram corresponding to the first embodiment shown in FIG. In the first embodiment, DC /
The DC switching power supply circuit Rd is composed of two switching circuits. One switching circuit is composed of a capacitor 32, an inductor 33, and a p-channel type MOS.
It comprises an FET 34, a parasitic diode 34a, a PWM (pulse width modulation) circuit 35, and a diode 36. The other switching circuit includes an inductor 40, PW
M (pulse width modulation) circuit 38, diode 39, PNP
Transistor 37. Further, an n-channel MOSFET 31, a parasitic diode 31a and a capacitor 41 are provided. One switching circuit outputs one of the voltage / current characteristics a or b shown in FIG. 2, and the other switching circuit outputs the other of the voltage / current characteristics a or b. The ID detection circuit 1 includes a constant voltage circuit 42, resistors 43, 44, 45,
It comprises an operational amplifier circuit 46.

In the DC / DC switching power supply circuit Rd, electric charges are stored by the capacitor 41. MOS
By turning on / off the FET 34 and / or the transistor 37, electric charge is stored in the capacitor 41. The MOSFET 34 is controlled by a PWM circuit 35, and the transistor 37 is controlled by a PWM circuit 38. The MOSFET 31 is connected to the secondary battery BT
Discharge switch.

In the ID detection circuit 1, a predetermined impedance is formed by the resistors 43, 44 and 45.
Since a predetermined voltage is output from the constant voltage circuit 42, the impedance is changed by the resistor R connected to the terminal T3. The changed value is output from the operational amplifier circuit 46 to the control circuit 2. As described above, the fluctuation of the voltage and current is detected by the ID detection circuit 1, and the PWM circuits 35 and 38 are controlled by the control circuit 2 so that the output voltage and current become constant. In the control circuit 2, when the PWM circuit 35 is turned on, the MOSFET 31 is turned on and the PWM circuit 3 is turned on.
5 is turned off, the MMOSFET 31 is turned off. When the PWM circuit 35 is turned on, the PWM
The circuit 38 is turned off, and when the PWM circuit 35 is turned off, the PWM circuit 38 is turned on.

In the first embodiment shown in FIG.
The / DC switching power supply circuit Rd includes two switching power supply circuits, but may include three or more switching power supply circuits. In this case, three or more types of voltage and current are output from the power supply unit.

An example of the operation of the first embodiment will be described with reference to the flowchart of FIG. In step S1, the ID detection circuit 1 detects an ID signal transmitted from the connected resistor R. In step S2, the value (voltage value) of the resistor R is detected from the ID signal.

In step S3, it is determined whether the detected resistance value, that is, the resistance R is 10 kΩ or 5 kΩ.
If it is determined to be kΩ, control is transferred to step S4. If it is determined to be 5 kΩ, control is transferred to step S7. If it is determined that neither is 10 kΩ or 5 kΩ, control is transferred to step S1. Return.

In step S4, a control signal is output from the ID detection circuit 1 to the control circuit 2 so that a voltage and a current are output when the resistor R of 10 kΩ is connected. For example, when a resistor R of 10 kΩ is connected, the DC / DC switching power supply circuit Rd outputs a voltage / current having a voltage / current characteristic a shown in FIG.

In step S7, a control signal is output from the ID detection circuit 1 to the control circuit 2 so that the voltage and current are output when the 5 kΩ resistor R is connected. For example,
When the resistor R of 5 kΩ is connected, the voltage / current of the voltage / current characteristic b shown in FIG. 2 is output from the DC / DC switching power supply circuit Rd.

In step S5, the control circuit 2 switches the DC / DC switching power supply circuit R in accordance with the supplied control signal.
The switching operation of d is controlled. In step S6,
The switching operation of the DC / DC switching power supply circuit Rd is performed. Then, control returns to step S1.

Further, a modification of the first embodiment will be described with reference to the block diagram of FIG. In the example shown in FIG. 7, when the connector CP connected to the terminal To is removed, the output of the DC / DC switching power supply circuit Rd stops. After the output is stopped, the connector CP is attached and the ID signal is detected.
Output from the C / DC switching power supply circuit Rd.

As described above, the ID detection circuit 1 always detects an ID signal. Therefore, in the ID detection circuit 1,
The attachment / detachment of the connector CP can be detected. Control signal confirmation circuit 5
At 1, the control signal supplied from the control circuit 2 to the DC / DC switching power supply circuit Rd is confirmed. DC / DC
When the control signal for operating the switching power supply circuit Rd is confirmed, the switch circuit 52 is turned on, and the DC / D
When the control signal for stopping the operation of the C switching power supply circuit Rd is confirmed, the switch circuit 52 is turned off. That is, when the ID detection circuit 1 detects that the connector CP is attached, the switch circuit 52 is turned on, and when it is detected that the connector CP is removed, the switch circuit 52 is turned off.

More specifically, as shown in FIG. 8, the switch circuit 52 is connected for a period of time t0 to t1 until the connector CP provided with the resistor Ra for transmitting the ID signal a is removed.
Is turned on, and the voltage / current of the voltage / current characteristic a corresponding to the ID signal a is output from the DC / DC switching power supply circuit Rd. Then, when the connector CP provided with the resistor Rb for transmitting the ID signal b is attached at time t2, the switch circuit 52 is turned on, and the voltage / current of the voltage / current characteristic b corresponding to the ID signal b is applied to the DC / DC switching power supply. Output from the circuit Rd. That is, during the period from time t1 to t2, the switch circuit 52 is turned off, and the output of the DC / DC switching power supply circuit Rd is stopped.

In the modification shown in FIG. 7, the switch circuit 52 is turned on / off and the output of the DC / DC switching power supply circuit Rd is controlled. However, the control circuit 2 controls only the DC / DC switching power supply circuit Rd. And the switch circuit 52 may be removed.

An example of the operation of this modification will be described with reference to the flowchart of FIG. In step S11, I
In the D detection circuit 1, an ID signal is detected. In step S12, it is determined whether or not the detected signal is an ID signal. If it is determined that the signal is an ID signal, control is transferred to step S13. If it is determined that the signal is not an ID signal, control is transferred to step S20.

In step S13, a control signal corresponding to the ID signal is supplied from the control circuit 2 to the DC / DC switching power supply circuit Rd. In step S14, the DC / DC switching power supply circuit R
d operates. In step S15, the switch circuit 52
Is turned on. In step S16, a voltage / current corresponding to the ID signal is output from the DC / DC switching power supply circuit Rd.

In step S17, the ID detection circuit 1 detects an ID signal. In step S18, it is determined whether or not the signal is the same ID signal. If it is determined that the signal is the same ID signal, the control returns to step S17. If it is determined that the signal is not the same ID signal, the control proceeds to step S19. In step S19, the switch circuit 52 is turned off. In step S20, the DC / DC switching power supply circuit R
The operation of d is stopped. Then, control returns to step S11.

Here, the second embodiment of the present invention is shown in FIG.
This will be described with reference to FIG. The second embodiment is a power supply unit that can supply at least two or more power supplies to the outside. As shown in FIG. 10, the power supply unit 61 is provided with two connectors, a connector 62a and a connector 62b. A power supply adapter 63a is connected to the connector 62a, and a power supply adapter 63b is connected to the connector 62b.

At this time, when power is supplied to the two electronic devices from the AC / DC switching power supply circuit Ra provided in the power supply unit 61, the maximum load used is the supply capacity of the AC / DC switching power supply circuit Ra. , The priority is set to the ID signal.

For example, when the ID signal b supplied from the power supply adapter 63b has a higher priority, the voltage / current is output with priority given to the connector 62b over the connector 62a. At this time, the voltage / current output from the connector 62a is stopped.

FIG. 11 shows an example in which the power supply adapter has a priority ID. Terminals 71 and 7 are connected to connector CP.
2, 73 and 74 are provided, and the connector CE is provided with terminals 75 and 76. Terminals 71 and 75 are connected, and terminals 72 and 76 are connected. Terminal 72
And 73, a resistor Ra is provided. A resistor Rb is provided between terminals 72 and 74.

An ID signal is supplied to the power supply unit from the resistors Ra and Rb. The power supply unit receives the supplied ID
The priority is determined according to the signal. Although two impedance elements are used in the power supply adapter shown in FIG. 11, the value of the impedance element having the higher priority is determined in advance, and the impedance element is detected.
You may make it determine.

A specific block diagram of the second embodiment will be described with reference to FIG. In FIG. 12, two types of voltage / current are output using two DC / DC switching power supply circuits. DC / DC
A switching circuit 82a is inserted between the switching power supply circuit Rda and the terminal Toa1. The terminal Toa3 is connected to the ID detection circuit 1a. In the ID detection circuit 1a, an ID signal is supplied to the control circuit 2a and the stop circuit 81a according to the detected ID signal. The control circuit 2a controls the switching operation of the DC / DC switching power supply circuit Rda according to the supplied ID signal. The stop circuit 81a turns off the switch circuit 82b when determining that the priority of the supplied ID signal is high.

A switching circuit 82b is inserted between the DC / DC switching power supply circuit Rdb and the terminal Tob1.
The terminal Tob3 is connected to the ID detection circuit 1b. In the ID detection circuit 1b, an ID signal is supplied to the control circuit 2b and the stop circuit 81b according to the detected ID signal. The control circuit 2b controls the DC according to the supplied ID signal.
/ DC controls the switching operation of the switching power supply circuit Rdb. When the stop circuit 81b determines that the supplied ID signal has a higher priority, the switch circuit 82b
Turn off a.

As described above, in this example, when the sum of the capacities of both voltage and current exceeds the usable range, one DC / DC is used to keep the capacity of the voltage and current within the usable range.
The ID signal is set so that the DC switching power supply circuit operates preferentially and the operation of the other DC / DC switching power supply circuit stops.

An example of the operation of the second embodiment is shown in FIG.
This will be described with reference to the flowchart shown in FIG. In step S21, the ID signal is detected by the ID detection circuit. In step S22, it is determined whether the priority of the detected ID signal is high. If it is determined that the ID signal has high priority, the control proceeds to step S23.
If it is determined that the ID signal has a low priority, the control returns to step S21. In step S23, a stop signal for stopping the output of the other DC / DC switching power supply circuit is output. In step S24, the output of the other DC / DC switching power supply circuit is stopped.

In step S25, the ID signal is detected by the ID detection circuit. In step S26, the presence or absence of an ID signal with a high priority is determined. If it is determined that there is no ID signal with a high priority, control is transferred to step S27, and it is determined that an ID signal with a high priority is present. Then, control returns to step S25. In step S27, the output of the stop signal that stops the output of the other DC / DC switching power supply circuit is released. Step S2
At 8, the output of the other DC / DC switching power supply circuit is started. Then, control returns to step S21.

Referring to FIG. 14, a description will be given of a modification of the second embodiment in which a voltage / current is output to the connector Toa or Tob to which the connector CP has been previously connected. When the connector CP is connected to the terminal Toa prior to the terminal Tob, the ID detection circuit 1a outputs the ID
When the signal is detected, the switch circuit 82b is turned off in order to output the voltage / current to the terminal Toa preferentially.

When the switch circuit 82a is on and a load is connected, the DC / DC
A current output from the DC switching power supply circuit Rda is detected. When the current is detected in the current detection circuit 83a, the switch circuit 82b is turned off. Further, the detected current value is supplied from the current detection circuit 83a to the no-load detection circuit 84a. The no-load detection circuit 84a determines whether the detected current value is equal to or less than a predetermined small current,
If it is determined that the current is equal to or smaller than the predetermined small current, that is, it is determined that there is no load, a signal is supplied to the stop release circuit 85a. The stop release circuit 85a outputs a signal for releasing the output of the stop signal output from the stop circuit 81a to the switch circuit 82b.

Similarly, before the terminal Toa, the terminal Tob
Is connected to the connector CP, the ID signal is detected in the ID detection circuit 1b, and the switch circuit 82a is turned off in order to output the voltage / current to the terminal Tob preferentially.

When the switch circuit 82b is on and a load is connected, the DC / DC
A current output from the DC switching power supply circuit Rdb is detected. When a current is detected in the current detection circuit 83b, the switch circuit 82a is turned off. Further, the detected current value is supplied from the current detection circuit 83b to the no-load detection circuit 84b. The no-load detection circuit 84b determines whether the detected current value is equal to or smaller than a predetermined small current,
When it is determined that the current is equal to or smaller than the predetermined small current, that is, that there is no load, a signal is supplied to the stop release circuit 85b. The stop release circuit 85b outputs a signal for releasing the output of the stop signal output from the stop circuit 81b to the switch circuit 82a.

An example of the operation of the modification of the second embodiment shown in FIG. 14 will be described with reference to the flowchart shown in FIG. In step S31, the ID signal is detected by the ID detection circuit. In step S32, I
It is determined whether or not the D signal is detected. When the ID signal is detected, the control proceeds to step S33, and when the ID signal is not detected, the control returns to step S31. In step S33, the other switch circuit is turned off. In step S34, the own switch circuit is turned on.

In step S35, its own current is detected. In step S36, the presence or absence of a load is determined from the detected current. If it is determined that there is no load, the control proceeds to step S37, and if it is determined that there is a load, the control returns to step S35. In step S37, the own switch circuit is turned off. In step S38, the other switch circuit is turned on. In step S39,
The other current is detected. In step S40, the presence or absence of a load is determined from the detected current. If it is determined that there is no load, the control returns to step S33. If it is determined that there is a load, the control returns to step S39.

Further, as shown in FIG.
The power supply unit 61 provided with a
a1, 64a2, 64a3, 64b1, 64b2 and 64b3 may be provided.

The connector CP connected to the connector 62a
LEDs 64a1, 64a based on the ID signal transmitted from
One is selected from a2 and 64a3. For example, when an ID signal indicating that a connected electronic device is a personal computer is transmitted from the connector 62a, the LED 64a1 is selected, and an ID signal indicating that the electronic device is a VTR integrated digital camera is output from the connector 62a.
If transmitted from a, LED 64a2 is selected,
An ID signal indicating that the mobile phone is used is transmitted from the connector 62.
If transmitted from a, LED 64a3 is selected.

Then, the LED 64 based on the ID signal transmitted from the connector CP connected to the connector 62b.
One is selected from b1, 64b2 and 64b3. For example, when an ID signal indicating that the electronic device to be connected is a personal computer is transmitted from the connector 62b, the LED 64b1 is selected, and an ID signal indicating that the electronic device is a VTR integrated digital camera is transmitted from the connector 62b. LED 64b2 is selected, and if an ID signal indicating that the mobile phone is used is transmitted from the connector 62b, the LED 64b3 is selected.

The LEDs 64a1, 64a2, 64a3, 64
b1, 64b2 and 64b3 are connectors 62a and 62b.
The operation is performed in accordance with the voltage / current output from b, that is, the lighting / flashing / extinguishing is performed.

For example, an ID signal indicating that the personal computer is used is transmitted from the connector 62a.
When it is determined that the voltage / current suitable for the personal computer is output, the LED 64a1 is turned on. Also, an ID for notifying that it is a personal computer
When a signal is transmitted from the connector 62a and it is determined that no voltage or current is output, the LED 64a1 blinks. When it is determined that the ID signal is not transmitted and the voltage / current is not output, the LED 64a1 is turned off.

Further, when an ID signal indicating that the digital camera is a VTR-integrated digital camera is transmitted from the connector 62a and it is determined that a voltage / current suitable for the VTR-integrated digital camera is output, the LED 64a2 is turned on. If an ID signal indicating that the digital camera is a VTR integrated type is transmitted from the connector 62a and it is determined that no voltage or current is output, the LED 64
a2 blinks. When it is determined that the ID signal is not transmitted and the voltage / current is not output, the LED 64a2
Turns off.

Then, I is notified that it is a mobile phone.
When it is determined that the D signal is transmitted from the connector 62a and the voltage and current suitable for the mobile phone are output, LE
D64a3 lights up. When an ID signal indicating that the mobile phone is used is transmitted from the connector 62a and it is determined that no voltage or current is output, the LED 64a3 blinks. When it is determined that the ID signal is not transmitted and the voltage / current is not output, the LED 64a3 is turned off.

Similarly, an ID signal indicating that the personal computer is used is transmitted from the connector 62b.
When it is determined that the voltage and current suitable for the personal computer are output, the LED 64b1 is turned on. Also, an ID for notifying that it is a personal computer
When the signal is transmitted from the connector 62b and it is determined that the voltage / current is not output, the LED 64b1 blinks. When it is determined that the ID signal is not transmitted and the voltage / current is not output, the LED 64b1 is turned off.

Further, an ID signal indicating that the digital camera is a VTR-integrated digital camera is transmitted from the connector 62b, and when it is determined that a voltage / current suitable for the VTR-integrated digital camera is output, the LED 64b2 is turned on. If an ID signal indicating that the digital camera is a VTR-integrated digital camera is transmitted from the connector 62b and it is determined that no voltage / current is output, the LED 64
b2 blinks. When it is determined that the ID signal is not transmitted and the voltage / current is not output, the LED 64b2
Turns off.

Then, I is notified that the mobile phone is used.
When it is determined that the D signal is transmitted from the connector 62b and the voltage and current suitable for the mobile phone are output, LE
D64b3 lights up. When an ID signal indicating that the mobile phone is used is transmitted from the connector 62b and it is determined that no voltage or current is output, the LED 64b3 blinks. When it is determined that the ID signal is not transmitted and the voltage / current is not output, the LED 64b3 is turned off.

An example of the operation of the LED 64 will be described with reference to the block diagram shown in FIG. The ID detection circuit 1 detects an ID signal transmitted from a power supply adapter connected to the terminal To. The detected ID signal is I
It is supplied from the D detection circuit 1 to the control circuit 2. Control circuit 2
Then, a control signal for operating the LED corresponding to the supplied ID signal is supplied to the LED unit 64. LED section 64
In, the LED corresponding to the control signal is selected.

The current detection circuit 83 detects a current output via the terminal To. The detected current is supplied to the control circuit 2. In the control circuit 2, a control signal is supplied to the LED unit 64 so that an operation (lighting, blinking, extinguishing) corresponding to the supplied current is performed. LED
In the unit 64, the LED is turned on in response to the control signal,
Flashes or turns off.

An example of the control at this time will be described with reference to the flowchart shown in FIG. In step S51, an ID signal is detected. In step S52, it is determined from the detected ID signal whether the connected load is a personal computer, a VTR-integrated digital camera, or a mobile phone. If it is determined that the digital camera is a personal computer, the control proceeds to step S53. If it is determined that the digital camera is a VTR-integrated digital camera, the control proceeds to step S54. Control transfers.

In step S53, the LED a1 or b1 is selected, and the selected LED a1 or b1 blinks.
In step S54, the LED a2 or b2 is selected, and the selected LED a2 or b2 blinks. Step S5
At 5, the LED a3 or b3 is selected and the selected LE
Da3 or b3 blinks.

In step S56, a current is detected.
In step S57, based on the detected current, it is determined whether or not to turn on the selected LED. If it is determined that the selected LED should be turned on, the control proceeds to step S58. Control returns to S56. Then, control returns to step S51.

A circuit for stopping the supply of a voltage equal to or higher than a predetermined voltage will be described with reference to FIGS. 19 and 20. The circuits shown in FIGS. 19 and 20 are provided inside one of connectors CP and CE of the power supply adapter.

First, an example shown in FIG. 19 will be described. The cathode of Zener diode 93 is connected to terminal 91, and the anode is connected to terminal 92 via resistors 94 and 95. A resistor 96 is inserted between the collector of the NPN transistor 97 and the terminal 91. Transistor 97 has its emitter connected to terminal 92 and its base connected to the connection point of resistors 94 and 95.

The source of the n-channel MOSFET 98 is connected to the terminal 91, and the drain is connected to the terminal 10.
1 is connected. The gate of the MOSFET 98 is connected to a resistor 9
9 is connected to the collector of the NPN transistor 100. Note that the diode 98a is a parasitic diode. The emitter of the transistor 100 is connected to the terminal 10
2 and its base is connected to the collector of transistor 97. Terminals 92 and 102 are connected.

When the voltage exceeds a predetermined voltage, the Zener diode 93 turns on. When the transistor 97 is turned on, the transistor 100 is turned off, and the MOSF
ET98 turns off.

Next, another example shown in FIG. 20 will be described. The cathode of Zener diode 113 is connected to terminal 111, and its anode is connected to terminal 112 via resistors 114 and 115. One of the fuses 116 is connected to the terminal 111, and the other is connected to the terminal 118. The anode of the thyristor 117 is connected to the terminal 11
8 and its cathode is connected to the terminal 119. The gate of the thyristor 117 is connected to a connection point between the resistors 114 and 115. Terminals 112 and 1
19 is connected.

When the voltage exceeds a predetermined voltage, the Zener diode 113 turns on. Then, since the thyristor 117 is turned on, the fuse 116 is blown.

In this embodiment, the connector CP of the power supply adapter is connected to the power supply unit, and the connector CE is the power supply adapter connected to the electronic equipment.
The electronic device may be configured such that one end of the power supply adapter is connected to the electronic device and the other end of the power supply adapter is connected to the power supply unit. At this time, an impedance element may be provided at the other end of the power supply adapter, or an impedance element may be provided at one end of the power supply adapter, that is, a coupling portion of the electronic device.

[0077]

According to the present invention, it is possible to provide an impedance element in a connector, detect an ID signal transmitted from the impedance element, and output a voltage and a current corresponding to the detected ID signal. Voltage and current corresponding to the device can be output, and voltage and current can be output according to the device connected to the outside, so that high security can be maintained and used. Therefore, the use range of the power supply unit can be expanded.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment to which the present invention is applied.

FIG. 2 is an example of a voltage-current characteristic used for describing the present invention.

FIG. 3 is a schematic diagram used for describing a power supply adapter of the present invention.

FIG. 4 is a block diagram used for describing the present invention.

FIG. 5 is a circuit diagram of a first embodiment to which the present invention is applied.

FIG. 6 is a flowchart of the first embodiment to which the present invention is applied.

FIG. 7 is a block diagram of a modification of the first embodiment to which the present invention is applied.

FIG. 8 is a schematic diagram used for describing the present invention.

FIG. 9 is a flowchart of a modified example of the first embodiment to which the present invention is applied.

FIG. 10 is an external view of a second embodiment to which the present invention is applied.

FIG. 11 is a schematic diagram used for describing a power supply adapter of the present invention.

FIG. 12 is a block diagram of a second embodiment to which the present invention is applied.

FIG. 13 is a flowchart of a second embodiment to which the present invention is applied.

FIG. 14 shows a first embodiment of the second embodiment to which the present invention is applied.
It is a block diagram of the modification of.

FIG. 15 shows a first embodiment of the second embodiment to which the present invention is applied.
It is a flowchart of the modification of FIG.

FIG. 16 shows a second embodiment of the second embodiment to which the present invention is applied.
It is an external view of the modification of.

FIG. 17 shows a second embodiment of the second embodiment to which the present invention is applied.
It is a block diagram of the modification of.

FIG. 18 shows a second embodiment of the second embodiment to which the present invention is applied.
It is a flowchart of the modification of FIG.

FIG. 19 is an example of a protection circuit applied to the present invention.

FIG. 20 is another example of the protection circuit applied to the present invention.

FIG. 21 is a schematic diagram for explaining how to use the power supply unit.

[Explanation of symbols]

Ra: AC / DC switching power supply circuit, Rd
・ DC / DC switching power supply circuit, Ti, To ...
Terminals: 1 ... ID detection circuit, 2 ... Control circuit, 3 ...
..Switch circuits, R... Resistors

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Chiho Konno 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Kumi Yashiro 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation F term (reference) 5B011 DA02 DB02 DB19 DB20 HH02 JB10

Claims (7)

[Claims] 1. A power supply adapter connected between a power supply unit that outputs a plurality of types of power supplies and an electronic device, the power supply adapter including at least three terminals, and a first connector connected to a connector of the power supply unit. A second connector that includes at least two terminals and is connected to a connector of the electronic device; and a cable that connects the first and second connectors; and a first terminal of the first connector; A first terminal of the second connector is connected; a second terminal of the first connector is connected to a second terminal of the second connector; An impedance element having a value corresponding to the type of the electronic device is provided between the first or second terminal and the third terminal of the first connector; When power is supplied to the device, the power supply adapter, characterized in that made it possible to generate an identification signal of the electronic device by the impedance element. 2. The first connector according to claim 1, further comprising a fourth terminal provided on the first connector, wherein the first or second terminal of the first connector and the fourth terminal of the first connector are provided. And a second impedance element different from the impedance element between the terminals. 3. A power supply unit adapted to supply a plurality of types of power to an electronic device via a power supply adapter, wherein the power supply adapter has at least three terminals, and A first connector connected to the connector, at least two terminals, a second connector connected to the connector of the electronic device, and a cable connecting the first and second connectors; A first terminal of the first connector is connected to a first terminal of the second connector, and a second terminal of the first connector is connected.
And the second terminal of the second connector are connected, and between the first or second terminal of the first connector and the third terminal of the first connector, An impedance element having a value corresponding to the type of the electronic device is provided, and when power is supplied to the impedance element from the power supply unit, an identification signal of the electronic device can be generated by the impedance element. A power supply unit to be connected, voltage conversion means capable of selectively outputting at least one of a plurality of types of power supplies to the electronic device, and the identification signal generated by the power supply adapter. Detection means for detecting, and control means for controlling the voltage conversion means so as to output a power supply corresponding to the identification signal from the plurality of types of power supplies. Power supply unit, characterized in that. 4. The electronic device according to claim 3, wherein the control unit is further configured to check a control signal for controlling the voltage conversion unit, and is connected between the voltage conversion unit and the electronic device. A power supply unit comprising: switch means for switching the state by the confirmation means. 5. The power supply unit according to claim 3, wherein the output of the voltage conversion means is temporarily stopped when switching the power output from the voltage conversion means. 6. An electronic device to which power is supplied from a power supply unit via a power supply adapter, wherein an impedance element for generating an identification signal for identifying a power supply suitable for the power supply unit is connected to the power supply adapter. An electronic device characterized by being provided on a connector. 7. A power supply system in which a power supply adapter is connected when power supplied from a power supply unit is supplied to an electronic device, wherein the power supply unit selects at least one of a plurality of types of power supplies. Voltage conversion means capable of selectively outputting to an electronic device, detection means for detecting an identification signal generated in a power supply adapter, and outputting a power supply corresponding to the identification signal from the plurality of types of power supplies Control means for controlling the voltage conversion means, the power supply adapter includes at least three terminals, a first connector connected to a connector of the power supply unit, and at least two terminals. A second connector connected to a connector of the electronic device, and a cable connecting the first and second connectors. The first terminal of the first connector is connected to the first terminal of the second connector, and the second terminal of the first connector and the second terminal of the second connector are connected to each other. And an impedance element having a value corresponding to the type of the electronic device is provided between the first or second terminal of the first connector and the third terminal of the first connector. A power supply system characterized in that when power is supplied from the power supply unit to the impedance element, an identification signal of the electronic device can be generated by the impedance element.