JPH11299093A - Power supply adapter, electronic unit and signal transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the power outputted from an AC adapter with a signal which is supplied from a connected set and to make the loss extremely small. SOLUTION: An AC switch circuit 1 and the primary side of a transformer 2 are inserted between terminals T1 and T2 in series. One secondary side of the transformer 2 is connected to the anode of a diode 3, and a capacitor 4 is inserted between the cathode of the diode 3 and the other secondary side of the transformer 2. A regulator part 5 which outputs constant voltage/constant current is inserted between the cathode of the diode 2 and a terminal T3. A circuit part 6 which controls the AC adapter is inserted between the terminals T3 and T4. The circuit part 6 sets the AC switch circuit to an on-state, in accordance with an AC operation signal transmitted from a set 7. The output power is supplied to the set 7 via the terminals T4, T5, T4 and T6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply adapter which connects a set of electronic devices and a power supply adapter, and which can greatly reduce the power consumption of the power supply adapter by a signal from the set of electronic devices. The present invention relates to an electronic device and a signal transmission system.

[0002]

2. Description of the Related Art A power supply adapter (hereinafter, referred to as an AC adapter) capable of both supplying and charging power to a set of electronic devices having a secondary battery therein (hereinafter, referred to as a set) has been known. ing. The AC adapter is connected to the set when charging the secondary battery of the set, operating the set independently of charging, or operating the set while charging.

[0003]

After performing these operations, the connection between the AC adapter and the set is not often disconnected immediately, and the conventional AC adapter always supplies power to the output side. That is, even if the set switch is turned off, the AC adapter is still operating,
As shown in FIG. 25, a portion that is lost irrespective of the load state unless the device is completely stopped (a hatched portion in FIG. 25).
Can not be eliminated. That is, there is a problem that power cannot be completely saved because a loss has occurred regardless of the state of the load.

Therefore, in order to reduce the loss, in the case of a switching power supply, intermittent oscillation or the like is performed to reduce the power consumption under no load as much as possible. However, there has been a problem that even if the power consumption at no load can be reduced, the power consumption at no load cannot be reduced to almost zero.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power supply adapter that controls an AC adapter by a signal supplied from a set and can greatly reduce a loss in view of these problems.

[0006]

According to a first aspect of the present invention, there is provided a power supply adapter which is connected to a commercial power supply and outputs a predetermined power supply. A power supply, comprising: a power supply circuit that generates a signal; a detection unit that detects a signal transmitted from the electronic device; and a switching unit that stops or starts an output operation of the power supply circuit according to the detected signal. Supply adapter.

According to a fourth aspect of the present invention, there is provided a signal supply means connected to a power supply adapter with two or three terminals and transmitting a signal to the power supply adapter, a power supply unit for transmitting a signal, and a power supply. An electronic device comprising an output power supplied from an adapter and switching means for connecting or disconnecting a load.

According to a seventh aspect of the present invention, there is provided a power supply adapter connected to a commercial power supply and outputting a predetermined power, and a signal transmission system connecting the power supply adapter to an electronic device. The devices are connected by two terminals or three terminals, a power supply adapter includes a power supply circuit for generating output power, a detection unit for detecting a signal supplied from the electronic device, and an output of the power supply circuit according to the detected signal. Electronic equipment having a first switching means for stopping or starting the operation, a signal transmission means for transmitting a signal to the power supply adapter, a power supply unit for transmitting the signal, and a power supply adapter And a second switching unit for connecting or disconnecting a load from the output power supply.

A set is connected to an AC adapter connected to a commercial power supply, and a signal output from the set causes
The on / off state of the AC switch circuit provided on the primary side of the transformer of the AC adapter is controlled. In particular,
When the set is connected to the AC adapter but the voltage power supplied from the AC adapter is not necessary, an AC switch provided on the primary side by a signal from the set to make the loss of the AC adapter almost zero. The circuit can be turned off. When an AC operation signal is supplied from the set to the AC adapter, the AC switch circuit can be turned on.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, in order to facilitate the description of the present invention, FIG. 1 shows a schematic configuration in which an AC adapter and a set are connected. In the AC adapter, terminals T1 and T2 are connected to a commercial power supply. Terminal T1 and transformer 2
The AC switch circuit 1 is inserted between one of the primary sides. The other primary side of the transformer 2 is connected to the terminal T2.

One of the secondary sides of the transformer 2 is connected to the anode of the diode 3, and a capacitor 4 is inserted between the cathode of the diode 3 and the other of the secondary side of the transformer 2. Output power is generated from the diode 3 and the capacitor 4. Cathode of diode 2 and terminal T3
The regulator unit 5 that outputs a constant voltage and a constant current is inserted between the two. A circuit section 6 for controlling the AC adapter is inserted between the terminals T3 and T4. Set 7
Output power is supplied via terminals T3, T5 and T4, T6.

As described above, the connected AC adapter and the set 7 are connected to each other when the state of a switch circuit (hereinafter, referred to as a set switch circuit) included in the set 7 is detected by the circuit unit 6 to be off. , The AC switch circuit 1 is turned off, and the power consumption can be made substantially zero. When the circuit section 6 detects that the set switch circuit is in the ON state, the AC switch circuit 1 is turned ON.
Output power is supplied to the set 7.

FIG. 2 shows a first embodiment of the present invention.
In the AC adapter, terminals T1 and T2 are connected to a commercial power supply. An AC switch circuit 11 is inserted between the terminal T1 and one of the primary sides of the transformer 12. Transformer 1
2 is connected to the terminal T2.

One of the secondary sides of the transformer 12 is connected to the anode of the diode 13, and a capacitor 14 is inserted between the cathode of the diode 13 and the other secondary side of the transformer 12. An output power is generated from the diode 13 and the capacitor 14. The anode of diode 15 is connected to the cathode of diode 13, and the cathode is connected to current detection circuit 16. The current detection circuit 16 is connected to the terminal T3 via the constant voltage circuit 17. The cathode of diode 13 is connected to detection circuit 18. The detection circuit 18 detects the ON / OFF state of the switch circuit 19.
A signal for controlling the off operation is output. Terminals T3 and T
4, the voltage detection circuit 20 is inserted. The signal from the current detection circuit 16, the signal from the detection circuit 18, and the signal from the voltage detection circuit 20 are supplied to the switch ON circuit 21. The switch ON circuit 21 controls the ON / OFF operation of the AC switch circuit 11.

In the set, terminals T5 and T6 are connected to terminals T
3 and T4. The switch circuit 22 and the secondary battery 23 are inserted in series between the terminals T5 and T6. The set switch circuit 24 is inserted between the terminal T5 and the load 26. The switch circuit 22 and the set switch circuit 24 are controlled by a control circuit 25.

The operation of the embodiment shown in FIG. 2 will be described. First, when the detection circuit 18 determines that the commercial power supply is connected for the first time, an ON signal is supplied to the switch ON circuit 21 in order to turn on the AC switch circuit 11. Also, in order to turn on the switch circuit 19 similarly,
An ON signal is supplied from the detection circuit 18. in this way,
When the commercial power supply is connected for the first time, the AC switch circuit 11 is turned on for a predetermined period in order to operate the secondary circuit of the transformer 12.

The current detection circuit 16 detects whether or not a load is connected based on the detected current. If it is determined that the load is not connected, that is, if there is no load, the AC switch circuit 11 is turned off. An off signal is supplied to the switch ON circuit 21 in order to turn off. When a load is not connected, for example, when a current that is 1/100 A or less of a normally output predetermined current value is detected, it is determined that there is no load, and the AC switch circuit 11 is turned off. When the detection circuit 18 detects that the AC switch circuit 11 has been turned off, the switch circuit 1
9 is turned off, a switch circuit 19 outputs an off signal.
Output to By turning off the switch circuit 19, the backflow prevention circuit operates.

In the voltage detection circuit 20, based on the detected voltage, a signal transmitted from the set to the AC adapter,
That is, a signal requesting to output a voltage power supply (hereinafter, referred to as an AC operation signal) is detected, and the switch ON circuit 21 is turned on to turn on the AC switch circuit 11 in accordance with the detected signal. A signal is provided.
The signal detected at this time can generate a predetermined signal by performing an on / off operation of the operation switch circuit 22 on the set side.

Although not shown in FIG. 2, when the voltage detection circuit provided on the set side determines that voltage power is being output from the AC adapter, the set switch circuit 24 is turned on. Then, power is supplied to the load 26.

FIG. 3 shows an example of transmitting an AC operation signal from the set to the AC adapter. In this example, as an example in which power can be stored on the set side, an AC adapter whose output power is stopped is operated using a secondary battery or a capacitor and a primary battery. In the AC adapter, the constant voltage circuit 31 outputs a constant voltage and constant current. Further, a switch circuit 32 is provided between the constant voltage circuit 31 and the ground. This switch circuit 32
A backflow prevention circuit that prevents backflow when turned off. When an AC operation signal is supplied from the set side, the power supply activation circuit 33 operates to output voltage power from the AC adapter side. At this time, the power supply activation circuit 33 operates by the power supplied from the set-side secondary battery 37.

On the set side, the voltage power supply is switched to the load 35 by turning on / off the set switch circuit 34.
Is controlled. Operation switch circuit 36
A secondary battery 37 is provided between the power supply and the ground, and by performing an on / off operation of the operation switch circuit 36,
The operation signal is transmitted to the AC adapter.

FIG. 4 shows another example of transmitting an AC operation signal from the set to the AC adapter. In another example, a transmission line for transmitting an AC operation signal is provided with terminals T7 and T8, that is, a set and an AC adapter are connected by three terminals. In the AC adapter, the regulator section 41 outputs a constant voltage and a constant current. The detection circuit 42 detects a state in which the voltage power supply is output, and supplies a signal to the activation circuit 43. The activation circuit 43 operates so that voltage power is output from the AC adapter in accordance with the supplied signal.

On the set side, a load 45 is provided with a set switch circuit 44, and a secondary battery 47 is provided with an operation switch circuit 46. By performing the ON / OFF operation of the operation switch circuit 46, an AC operation signal is generated, and the AC operation signal is supplied to the activation circuit 4 via the terminals T8 and T7.
3. In the starting circuit 43, as described above, A
The operation is performed so that voltage power is output from the C adapter.

FIG. 5 shows a second embodiment of the present invention.
The terminal T1 includes a current detection circuit 51 and a switch circuit 5
2 are connected. A switch circuit 52 and a voltage detection circuit 53 are connected in series between the terminals T1 and T2.
In the voltage detection circuit 53, a signal is supplied to a timer (Δt) circuit 54 when commercial power is first input. In the timer circuit 54, a signal is supplied to the ON signal circuit 56 to turn on the AC switch circuit 57 for a predetermined time Δt. The AC switch circuit 57 is turned on while the signal from the ON signal circuit 56 is being supplied. When the predetermined time Δt is completed, a signal is supplied from the timer circuit 54 to the OFF signal circuit 55, and the switch circuit 52 is turned off.

FIG. 6 is a timing chart showing an example of the operation at this time. 6A shows the state of the AC switch circuit 57, and FIG. 6B shows the state of the switch circuit 52.
As shown in FIG. 6A, at time point a, the AC switch circuit 57 is turned on, and as shown in FIG. 6B, the switch circuit 52 is turned on for a period Δt. Then, when the period of Δt ends, the switch circuit 52 is turned off. At the time point b, the photocoupler 71
A signal for turning on the AC switch circuit 57 is transmitted from the secondary side of the transformer 60 via the transformer 60, and the AC switch circuit 57 is turned on.

In the current detection circuit 51, a signal is supplied to a stop signal circuit 58 to turn off the AC switch circuit 57 in accordance with the detected current value. The ON control circuit 59 is coupled to the photocoupler 71r and controls the ON / OFF operation of the AC switch circuit 57. A signal from the stop signal circuit 58 is also supplied to the AC switch circuit 57 via the ON control circuit 59.

One side of the secondary side of the transformer 60 is connected to the anode of the diode 61, and a capacitor 62 is inserted between the cathode of the diode 61 and the other side of the secondary side of the transformer 60. A voltage power supply is generated from the diode 61 and the capacitor 62. The cathode of diode 61 is connected to current detection circuit 65. The current detection circuit 65 detects a current output from the terminal T3,
The detection result is supplied to the OFF signal circuit 68. O
In the FF signal circuit 68, when it is determined that there is no load from the detection result, a signal for turning off the AC switch circuit 57 via the ON signal circuit 70 is output from the transformer 60.
It is transmitted to the next side.

In the constant-voltage / constant-current circuit 66, a constant-voltage / constant-current power supply is output via a terminal T3. Further, a switch circuit 67 is provided between the constant voltage / constant current circuit 66 and the terminal T4. An ON signal circuit 70 is provided between the terminals T3 and T4.
And T4, the AC operation signal transmitted from the set and the signal from the OFF signal circuit 68,
In order to control the on / off operation of the switch circuit 57,
A signal is supplied to the photocoupler 71t.

One of the secondary sides of the transformer 60 is connected to the anode of the diode 63, and a capacitor 64 is inserted between the cathode of the diode 63 and the other side of the secondary side of the transformer 60. A voltage power supply is generated from the diode 63 and the capacitor 64. Diode 6
The cathode of No. 3 is connected to the backflow prevention detection circuit 69.
The backflow prevention detection circuit 69 outputs a signal for controlling the on / off operation of the switch circuit 67 according to the detected voltage power supply.

In the embodiment shown in FIG. 5, the current detection circuit 51 is provided on the primary side of the transformer 60 and the current detection circuit 65 is provided on the secondary side. It may be provided.

FIG. 7 shows a third embodiment of the present invention.
FIG. 7 is a circuit diagram of the transformer 81 included in the AC adapter.
It shows the next side. One of the secondary sides of the transformer 81 is connected to the anode of the diode 82, and a capacitor 83 is inserted between the cathode of the diode 82 and the other secondary side of the transformer 81. This diode 82
And the capacitor 83 generates a voltage power supply. The cathode of diode 82 is connected to current detection circuit 86. In the current detection circuit 86, a current output from the terminal T3 is detected, and the detection result is supplied to the ON signal circuit 90. When the ON signal circuit 90 determines that there is a load from the detection result, for example, when the detected current is equal to or more than the reference current, the ON signal circuit 90
A signal for turning on the switch circuit is supplied to the photocoupler 92t. Further, the on / off operation of the switch circuit 88 provided between the constant voltage / constant current circuit 87 and the terminal T3 may be controlled based on the detection result of the current detection circuit 86.

In the constant voltage / constant current circuit 87, a constant voltage / constant current power supply is output via a terminal T3. An ON detection circuit 91 is provided between the terminals T3 and T4.
The detection circuit 91 turns on / off the primary-side AC switch circuit based on the AC operation signal transmitted from the set via the terminals T3 and T4 and the signal from the ON signal circuit 90.
To control the OFF operation, a signal is supplied to the photocoupler 92t. The anode of the photocoupler 92t is ON
The detection circuit 91 is connected, and its cathode is connected to the terminal T4.

One of the secondary sides of the transformer 81 is connected to the anode of the diode 84, and a capacitor 85 is inserted between the cathode of the diode 84 and the other of the secondary sides of the transformer 81. A voltage power supply is generated from the diode 84 and the capacitor 85. Diode 8
4 is connected to the OFF signal circuit 89. O
The FF signal circuit 89 outputs a signal for controlling the on / off operation of the switch circuit 88 according to the detected voltage power supply.

In FIG. 7, the current is detected by the current detection circuit 86 on the secondary side of the transformer 81. If the current is equal to or larger than the reference current, it is determined that the load is connected, and the primary side AC is detected. An on signal is output to turn on the switch circuit. If the current is equal to or less than the reference current, it is determined that there is no load or a state close to no load, the AC switch circuit is turned off, and the switch circuit 88 is turned off to prevent backflow. When the ON detection circuit 91 detects the AC operation signal transmitted from the set, A
To turn on the C switch circuit, an on signal is supplied to the photocoupler 92t.

FIG. 8 shows a fourth embodiment of the present invention.
Commercial power is supplied from terminals T1 and T2. Terminal T
1 and one of the primary sides of the transformer 122, the triac 101 is inserted. A diode 102 and a capacitor 103 are inserted between the terminal T1 and the ground, and a voltage power supply is generated from the diode 102 and the capacitor 103.

Between the cathode of the diode 102 and ground, a capacitor 105, resistors 106 and 107 are inserted in series, and similarly, the resistors 108 and 109 and the collector and emitter of the transistor 110 are inserted. The base of transistor 110 is connected to the node between resistors 106 and 107. The emitter of the transistor 104 is
The capacitor 112 is connected to the cathode of the diode 102, and is inserted between the collector of the transistor 104 and the ground. The base of the transistor 104 is a resistor 10
8 and 109 are connected. Transistor 1
04, between the collector and ground, resistors 111 and 11
3 are inserted in series.

Between the terminal T1 and the anode of the diode 116, a resistor 114 and a capacitor 115 are inserted in parallel, and between the cathode of the diode 116 and the ground.
The resistor 117 is inserted. Transistor 118 has a collector connected to the anode of diode 116, an emitter connected to the gate terminal of triac 101, and a base connected to transistor 1 through resistor 119.
Connected to 20 collectors. The base of the transistor 120 is connected to the connection point of the resistors 111 and 112,
Its emitter is grounded. The collector of the photocoupler 121r is connected to the emitter of the transistor 118, and the emitter is connected to the collector of the transistor 118.

One of the secondary sides of the transformer 122 is connected to the anode of the diode 123, and a capacitor 124 is inserted between the cathode of the diode 123 and the other side of the transformer 122. A voltage power supply is generated from the diode 123 and the capacitor 124. The cathode of diode 123 is connected to current detection circuit 125. The current detection circuit 125 detects the current output from the terminal T3. When the detected current is lower than the reference current, a signal is supplied to the photocoupler 121t to turn the triac 101 off, and when the detected current is higher than the reference current, the triac 101 is turned on.

The operation of FIG. 8 will be described. First, when an AC input voltage is supplied to the terminals T1 and T2, it is rectified by the diode 102 and the capacitor 103,
DC. When the input voltage is applied for the first time, the transistor 104 is turned on when the transistor 110 is turned on for a predetermined time by the time constant including the capacitor 105 and the resistor 106. Then, the transistor 120 and the transistor 118 are turned on for a predetermined time by the time constant including the capacitor 112 and the resistors 111 and 113, and the triac 101 is also turned on. That is, the capacitor 105 and the resistor 10
6 and capacitor 112 and resistors 111 and 11
3, the predetermined time Δt for turning on the triac 101 when the input voltage is input for the first time is determined.

The capacitor 105 and the resistor 106
When the transistor 110 is turned off by the time constant of, the transistor 104 is turned off.
When the transistor 120 is turned off by the time constant including the capacitor 112 and the resistors 111 and 113, the transistor 118 is turned off and the triac 101 is also turned off.

To apply a drive power supply (bias) as a negative power supply to the gate terminal of the triac 101, a resistor 114, a capacitor 115, a diode 116
And resistor 117 are connected to the collector of transistor 118.

FIG. 9 shows a flowchart of an example of this embodiment. In step S1, the voltage detection circuit detects that commercial power has been input. In step S2, the AC switch circuit is turned on for a predetermined time Δt. As a result, voltage power is supplied to the secondary side. In step S3, after a predetermined time of Δt, the voltage detection circuit is disconnected by turning off the switch circuit.

In step S4, the current output from the AC adapter is detected by the secondary side current detection circuit. In step S5, it is determined whether the detected current is equal to or greater than the reference current. If it is determined that the current is equal to or greater than the reference current, it is determined that the set is connected, and step S11 is performed.
, The AC switch circuit is turned on. If it is determined that the set is smaller than the reference current, it is determined that the set is not connected.
The switch circuit is turned off.

In step S7, the backflow prevention circuit operates. In step S8, a signal transmitted from the set side is received. In step S9, the received signal is AC
It is determined whether or not the signal is an operation signal. If it is determined that the signal is an AC operation signal, in step S10, the AC switch circuit is turned on, and the control returns to step S4. When it is determined that the signal is not the AC operation signal, the control returns to step S8.

In step S11 described above, AC
The stop circuit for turning off the switch circuit may be released, and the AC switch circuit may be turned off.

FIG. 10 shows a fifth embodiment of the present invention. FIG. 10 shows an example of the input portion of the set. An OFF detection circuit 132 for detecting the OFF state of the AC switch circuit of the AC adapter is provided between the terminals T5 and T6. The OFF detection circuit 132 supplies a signal to the set switch circuit 131 and the stop circuit 133. A set switch circuit 131 and a load 136 are connected in series between terminals T5 and T6,
The signal transmission circuit 134 and the secondary battery 13
5 are connected in series. The secondary battery 135 is a primary battery,
Any one of a secondary battery and an external power supply is used.

The ON / OFF state of the set switch circuit 131 is supplied to the signal transmission circuit 134. In the stop circuit 133, a signal for stopping signal transmission in accordance with the signal from the OFF detection circuit 132 is supplied to the signal transmission circuit 134.

An example of the operation of FIG. 10 will be described. First, the terminal T5 and the terminal T3 are connected, and the terminal T6 and the terminal T4 are connected. Then, whether or not the AC switch circuit is in the on state is detected by the OFF detection circuit 132, and when it is determined that the AC switch circuit is in the off state, the switch circuit 131 is turned off. At this time, the AC operation signal is supplied to the AC adapter, and the voltage power is also supplied to the AC adapter. A
The C adapter receives the AC operation signal from the set,
The AC switch circuit is turned on. The OFF detection circuit 132 detects whether the AC switch circuit is in the ON state, and when it is determined that the AC switch circuit is in the ON state, the stop circuit 1
The AC operation signal from the signal transmission circuit 134 is stopped via 33. Then, the switch circuit 131 is turned on, and the load 136 is connected.

FIG. 11 is a flowchart showing an example of this embodiment. FIG. 11 is an example of an operation of transmitting a signal from the set to the AC adapter and supplying power from the AC adapter. In step S21, an AC operation signal is transmitted from the set to the AC adapter using a primary battery, a secondary battery, a capacitor, or the like as a power source. In step S22, power for turning on the AC switch circuit is supplied from the set to the AC adapter. In step S23, power supply from the AC adapter is detected. In step S24, it is determined whether or not power is supplied from the AC adapter. When it is determined that power is supplied, in step S25, the set switch circuit is turned on. If it is determined that there is no power supply, control returns to step S21. In step S26, since the power is supplied to the load, the set operates. In step S27, the set switch circuit is turned off.

In step S21 described above, the AC operation signal is transmitted from the set, but the AC operation signal may be transmitted continuously until it is determined that power is supplied from the AC adapter. Alternatively, the AC operation signal may be transmitted at predetermined intervals, for example, at intervals of Δt. Further, in step S24, when it is determined that there is no power supply from the AC adapter, the control is returned to step S21, but as shown by the dotted line in the figure, the control is returned to step S21 via steps S29 and S28. May return. In step S29, the predetermined time Δt is counted by the timer, and in step S28, Δt
The signal transmission is stopped by the stop circuit for a predetermined time t.

FIG. 12 shows a sixth embodiment of the present invention. FIG. 12 shows an example of the input portion of the set. First, the set switch circuit 141 is turned off. The battery capacity of the secondary battery 145 is the capacity detection circuit 1
43 is detected. When the capacity detection circuit 143 determines that the capacity of the secondary battery 145 is insufficient, an AC operation signal is transmitted from the ON signal transmission circuit 142 to the AC adapter. In response to the AC operation signal, the AC switch circuit of the AC adapter is turned on, and power is supplied to the set.

When power input detection circuit 146 determines that power has been supplied to the set, a signal is supplied to charger 144 and switch ON circuit 148. The charger 144 charges the secondary battery 145 according to a signal from the power input detection circuit 146. Also, switch O
In the N circuit 148, a signal is supplied to the set switch circuit 141 in order to turn on the set switch circuit 141 in response to a signal from the power input detection circuit 146. When the set switch circuit 141 is turned on, power is supplied to the load 149.

When the capacity of the secondary battery 145 is fully charged, the capacity detection circuit 143 causes the set switch circuit 1
A signal is supplied to the stop circuit 147 in order to turn 41 off. In stop circuit 147, switch ON
The set switch circuit 141 is turned off via the circuit 148.

FIG. 13 shows a flowchart of an example of this embodiment. FIG. 13 shows an example of an operation of transmitting a signal from the set to the AC adapter and supplying power from the AC adapter. In step S31, the off state of the set switch circuit is confirmed. In step S32, the battery capacity is detected. In step S33, it is determined whether or not the detected battery capacity is equal to or smaller than the reference value. If it is determined that the battery capacity is equal to or smaller than the reference value, the control proceeds to step S34. Returns.

In step S34, an AC operation signal is transmitted from the set to the AC adapter. In step S35, the input power from the AC adapter is detected. In step S36, it is determined whether or not the detected input voltage is equal to or higher than the reference voltage. If it is determined that the input voltage is equal to or higher than the reference voltage, the control proceeds to step S37. If it is determined that the input voltage is lower than the reference voltage, the control proceeds to step S35. Returns. In step S37, a charging operation is performed.

Further, when the set switch circuit is forcibly turned on by the user, first, the fact that the set switch circuit is an on signal is transmitted, so that the voltage power is supplied from the AC adapter to the set. Then, the battery capacity is detected, and when it is determined that the detected battery capacity is larger than the reference value, the set switch circuit is turned off. When the detected battery capacity is determined to be equal to or less than the reference value and the voltage power supplied from the AC adapter is determined to be equal to or greater than the reference value, control is performed so that the set switch circuit is turned on.

In step S34 described above, the AC operation signal is transmitted from the set. However, the AC operation signal may be transmitted continuously, or at a predetermined interval, for example, Δt.
The AC operation signal may be transmitted at intervals of. Further, in step S36, when it is determined that the input voltage from the AC adapter is lower than the reference voltage, the control is returned to step S35. However, as shown by the dotted line in the figure, through steps S39 and S38, Control may return to step S34. In step S39, the predetermined time Δt is counted by the timer, and in step S38, the signal transmission is stopped by the stop circuit for the predetermined time Δt.

FIG. 14 shows a seventh embodiment of the present invention. FIG. 14 is an example of transmitting an AC operation signal from a set to an AC adapter. A set switch circuit 151 is provided between terminals T5 and 157. Terminal T
A capacitor 152 is inserted between 5 and ground. Vibration is generated by the vibration circuit 155, and the vibration is generated by, for example, a piezoelectric element 156 made of a ceramic material.
And the occurrence of vibration is supplied to the power supply operation detection circuit 154 as a signal. The piezoelectric element 156 is
Vibration is applied by the vibration circuit 155, that is,
A voltage is generated when pressure is applied. The generated voltage is transmitted to the AC adapter via the diode 153. The AC switch circuit is turned on according to the transmitted voltage, and the voltage power is supplied via the terminal T5. The power supply operation detection circuit 154 detects that the voltage power supply is supplied, and turns on the set switch circuit 151. When the set switch circuit 151 is turned on, voltage power is supplied to the set load via the terminal 157.

FIG. 15 shows a detailed circuit diagram in which a voltage is generated from the piezoelectric element 156 described above. The cathode of the diode 163 and the cathode of the diode 165 are connected to the output terminal. The anode of the diode 163 is connected to one of the output terminals of the piezoelectric element 161. Diode 16
The cathode of 2 is connected to the anode of diode 163, the anode of which is grounded. The anode of the diode 165 is connected to the other output terminal of the piezoelectric element 161. The cathode of the diode 164 is
5 and is connected to ground.

As shown in the figure, when a pressure is applied to the piezoelectric element 161 mechanically, for example, when a pressure is applied by a substance having a mass M, a voltage is generated in the piezoelectric element 161. The generated voltage is taken out of the output terminal via diodes 163 and 165.

FIG. 16 shows a flowchart of an example of this embodiment. FIG. 16 is an example in which an AC operation signal is transmitted using a voltage generated from a piezoelectric element by applying pressure to the piezoelectric element. Step S4
In 1, a vibration is mechanically applied to the piezoelectric element.
In step S42, the voltage from the piezoelectric element, that is, AC
An operation signal is generated. In step S43, the generated A
The C operation signal (voltage) is supplied to the AC adapter. In step S44, the AC switch circuit is turned on. In step S45, voltage power is supplied from the AC adapter to the set. In step S46, the supplied voltage power is detected in the set. Step S4
At 7, it is determined whether or not voltage power has been supplied. If it is determined that power has been supplied, control proceeds to step S48. If it is determined that power has not been supplied, control returns to step 46. In step S48, the set switch circuit is turned on.

FIG. 17 shows an eighth embodiment of the present invention. FIG. 17 shows an example in which a transmission path for transmitting signals is provided when the AC adapter and the set are connected, that is, three terminals are used for connection. An AC switch circuit 171 and one of the transformers 172 are connected between the terminals T1 and T2.
The next side is connected in series. AC switch circuit 171
Is controlled by the switch ON circuit 177.

The secondary side of the transformer 172 is connected to the input of the diode bridge 173. A capacitor 174 is inserted between the diode bridge 173 and the output. One of the outputs of the diode bridge 173 and the terminal T
Regulator unit 1 that outputs constant voltage and constant current
75 is inserted, and the other output of the diode bridge 173 is connected to the terminal T4. The signal supplied from the set via the terminal T7 is received by the receiving circuit 176.
The signal received by the receiving circuit 176 is the AC switch circuit 1
If the signal is an AC operation signal for turning ON the switch 71, an ON signal is supplied from the receiving circuit 176 to the switch ON circuit 177, and the AC switch circuit 171 is turned on.

In the set, a set switch circuit 181 and a load 186 are provided in series between terminals T5 and T6. The terminal T5 is connected to the charger 183, and charges the power supply unit 184. This power supply section 184
It is composed of a secondary battery or a capacitor. The power supply 184 includes a signal transmission circuit 182 and a capacitance detection circuit 18.
5 is supplied with power. In the capacitance detection circuit 185,
The capacity of the power supply unit 184 is detected. More specifically, the capacity detection circuit 185 detects a terminal voltage in the case of a secondary battery, and detects a capacity in the case of a capacitor.
The detected capacity is supplied to the signal transmission circuit 182.

The set switch circuit 181 is connected to the charger 18
3 is turned on when the power supply unit 184 is to be charged. This set switch circuit 181
Is supplied to the signal transmission circuit 182. In the signal transmission circuit 182, based on the capacitance from the capacitance detection circuit 185 and the state from the set switch circuit 181,
An AC operation signal for turning on the switch circuit 171 is transmitted via the terminals T8 and T7.

FIG. 18 shows a flowchart of an example of this embodiment. FIG. 18 is an example in which the AC switch circuit is controlled according to the state of the set switch circuit. In step S51, the AC switch circuit is off,
In this state, voltage power is not supplied to the set. In step S52, the set switch circuit is turned on. In step S53, A is transferred from the set to the AC adapter.
A C operation signal is transmitted. In step S54, the AC operation signal is received by the AC adapter. Step S5
At 5, the AC switch circuit is turned on, and voltage power is supplied to the set. Then, in step S56, the set switch circuit is turned off. In step S57, transmission of the AC operation signal is stopped. In step S58, an off signal for turning off the AC switch circuit is transmitted to the AC switch circuit.

FIG. 19 shows a flowchart of an example of this embodiment. FIG. 19 shows that the AC
It is an example of controlling a switch circuit. In step S61, the capacity of the power supply unit is detected. Here, the power supply unit is composed of a secondary battery or a capacitor. Step S62
In, it is determined whether the detected capacity is below the reference value,
When it is determined that it is equal to or less than the reference value, the control proceeds to step S63, and when it is determined that it is greater than the reference value, the control returns to step S61. In step S63, the state of the set switch circuit is detected. In step S64, it is determined whether the set switch circuit is in the off state,
If it is determined to be in the off state, control is transferred to step S65, and if it is determined to be in the on state, step S6 is performed.
The control moves to 8.

In step S65, an AC operation signal is transmitted from the set to the AC adapter. In step S66, the transmitted AC operation signal is received by the AC adapter. In step S67, the AC switch circuit is turned on. In Step S68, the charging operation of the power supply unit is performed by the charger.

FIG. 20 shows a ninth embodiment of the present invention. FIG. 20 shows an example in which a transmission path for transmitting signals is provided when the AC adapter and the set are connected, that is, three terminals are used for connection. An AC switch circuit 191 and one of the transformers 192 are connected between the terminals T1 and T2.
The next side is connected in series. AC switch circuit 191
Is controlled by the switch ON circuit 202.

The secondary side of the transformer 192 is connected to the input of the diode bridge 193. A capacitor 194 is inserted between the diode bridge 193 and the output. One of the outputs of the diode bridge 193 and the terminal T
Regulator unit 1 that outputs constant voltage and constant current
95 is inserted, and the other output of the diode bridge 193 is connected to the terminal T4. The current detection circuit 196
Connected to one of the outputs of diode bridge 193.
The current detection circuit 196 detects a current output from the terminal T3. The detected current is supplied to the charger 197 and the stop circuit 198. The power supplied to the charger 197 includes a switch circuit 199, terminals T7 and T8.
And for charging the secondary battery 208 via the switch circuit 207. The stop circuit 198 controls the operation of the charger 197 and the switch circuit 199 based on the current supplied from the current detection circuit 196.

The signal supplied from the set via the terminal T 7 is received by the receiving circuit 201. In the receiving circuit 201, the received signal is separated, and the separated signal is supplied to at least one of the charger 197, the stop circuit 200, and the switch ON circuit 202. The charger 197 is
It operates in response to a signal from the stop circuit 198 or a signal from the reception circuit 201. The stop circuit 200 controls the regulator 195 according to a signal from the reception circuit 201.
Control the operation of. If the signal received by the reception circuit 201 is a signal for turning on the AC switch circuit 191, an ON signal is supplied from the reception circuit 201 to the switch ON circuit 202.

In the set, a load 209 is provided between terminals T5 and T6. The detection circuit 203 detects the voltage power supplied from the terminal T5, and supplies a signal notifying the detection to the timer circuit 204.
In the timer circuit 204, a signal is supplied to the stop circuit 206 so as to stop signal transmission after a predetermined time of Δt. In the stop circuit 205, the signal transmission circuit 206
And a signal for stopping the signal transmitted from the signal transmission circuit 206. When an AC operation signal is transmitted from signal transmission circuit 206 to the AC adapter, switch circuit 207 is turned on. Switch circuit 2
The secondary battery 208 is inserted between the terminal 07 and the terminal T6.

An example of the operation of FIG. 20 will be described. The AC operation signal from the signal transmission circuit 206 is transmitted from the set to the AC adapter via the terminals T8 and T7. The transmitted signal is received by the receiving circuit 201. In the receiving circuit 201, a signal is supplied to the switch ON circuit 202 to turn on the AC switch circuit 191, and a signal is supplied to the stop circuit 200 to operate the regulator unit 195.
A signal is provided to operate. In the set,
When the voltage supply from the AC adapter is detected by the detection circuit 203, the stop circuit 20 is stopped via the timer circuit 204 to stop the signal transmission from the signal transmission circuit 205.
4 is supplied with a signal. The charger 197 includes a switch circuit 199, terminals T7 and T8, and a switch circuit 2
07, the secondary battery 208 is charged.

The AC adapter shown in FIG.
An AC switch circuit is provided on the primary side of the regulator 92, and a regulator 195 capable of stopping output is provided on the secondary side.
When the power saving is insufficient only by the off-state of the primary-side AC switch circuit 191 due to the circuit configuration provided with:
The output of the interlocking regulator 195 is stopped.

In FIG. 20, a charger 197 is provided on the AC adapter side to charge the set secondary battery 208 via terminals T7 and T8. Therefore, although the switch circuit for turning off the charging operation is provided in both the AC adapter and the set, the switch circuit may be provided in one of the AC adapter and the set.

FIG. 21 shows a flowchart of an example of this embodiment. FIG. 21 is an example in which the operations of the AC switch circuit, the regulator unit, and the charging unit can be controlled according to a signal from the set. In step S71, a signal is generated from the set to the AC adapter. In step S72, the signal is received by the AC adapter. In step S73, the received signal is separated. In step S74, it is determined whether or not the set connected to the AC adapter is a set of a correct correspondence with the AC adapter. If the set is a correct set of correspondence, the control is shifted to step S75, and the set is correct. If the set is not a correspondence, the control moves to step S80.

In step S75, the charger operates to charge the secondary battery. In step S76, the switch circuit for charging is turned on. Step S
At 77, the charging current is detected. In step S78, it is determined whether or not the detected charging current is equal to or lower than the reference current. If it is determined that the charging current is equal to or lower than the reference current, the control proceeds to step S79. If it is determined that the charging current is higher than the reference current, the control proceeds to step S77. Moves. In step S79, the switch circuit for charging is turned off, and in step S82
The control moves to.

In step S80, a signal is supplied to the stop circuit to stop the regulator section. Step S8
At 1, the operation of the charger is stopped. In step S82, the switch circuit provided on the primary side of the AC adapter is turned off.

In this example, control is shifted to step S82 after step S79, but control may be shifted to step S81.

In step S71, after the signal is transmitted, for example, after detecting the input voltage for a predetermined time Δt, the signal output from the set to the AC adapter may be stopped.

FIG. 22 shows a tenth embodiment of the present invention. FIG. 22 is an example of a circuit that detects an AC operation signal transmitted from a set and controls an AC switch circuit. Commercial power is supplied from terminals T1 and T2. A triac 211 is inserted between the terminal T1 and one of the primary sides of the transformer 227. Terminal T1 and diode 2
A resistor 222 and a capacitor 223 are inserted in parallel with the anode 24. A resistor 225 is inserted between the cathode of the diode 224 and the terminal T2. The collector of the photocoupler 228r is connected to the anode of the diode 224, and its emitter is connected to the triac 21.
1 gate terminal. A resistor 226 is inserted between the terminal T1 and the gate terminal of the triac 211.

The secondary side of the transformer 227 and the input of the diode bridge 229 are connected. A capacitor 230 is inserted between the outputs of the diode bridge 229.
The emitter of the transistor 231 that outputs a constant voltage and a constant current is connected to one of the outputs of the diode bridge 229, and the collector is connected to the terminal T3. The other output of diode bridge 299 is connected to terminal T4.

The anode of the photocoupler 228t is connected to the terminal T7, and the cathode thereof is connected to the transistor 235.
Connected to the collector. Resistors 233 and 234 are inserted between the emitter and base of transistor 235. The anode of the Zener diode 232 is connected to the resistor 23
3 and 234, the cathode of which is
Connected to terminal T7. The emitter of the transistor 235 is connected to the terminal T4.

In FIG. 22, Zener diode 232 is turned on in response to an AC operation signal transmitted from the set via terminal T7, and transistor 235 and photocouplers 228t and 228r are turned on. Is turned on and the terminal T
Voltage power is supplied to the set via 3.

FIG. 23 shows an eleventh embodiment of the present invention. FIG. 23 is an example of a circuit that detects an AC operation signal transmitted from the set and controls the AC switch circuit. Secondary side of transformer 241 and diode bridge 24
2 inputs are connected. A capacitor 243 is inserted between one of the outputs of the diode bridge 242 and the ground, and the other of the outputs is grounded. The collector of the transistor 244 that outputs a constant voltage and a constant current is connected to one of the outputs of the diode bridge 242, the emitter is connected to the terminal T3, and the base is connected to the control circuit 251. Terminal T4 is grounded.

The resistor 24 is connected between one of the outputs of the diode bridge 242 and the collector of the transistor 252.
5 is inserted, the emitter of the transistor 252 and the terminal T
7, a resistor 255 is inserted. Transistor 2
A resistor 253 is inserted between the collector and the base 52. The base of the transistor 254 is
2 has its collector connected to the base of transistor 252, and its emitter connected to terminal T7. Transistor 260 has its collector connected to the base of transistor 252, its emitter grounded, and its base connected to control circuit 251. A resistor 256 is connected between the emitter of transistor 254 and ground.
And 257 are inserted. One of the inputs of the difference amplifier 259 is connected to the connection point between the resistors 256 and 257,
The other of the inputs is connected to the cathode of Zener diode 258. The anode of Zener diode 258 is grounded. The output of the difference amplifier 259 is connected to the base of the transistor 252.

The resistors 246 and 247 are inserted between one of the outputs of the diode bridge 242 and the ground.
A resistor 2 is connected between the collector of transistor 252 and ground.
48 and 249 are inserted. One of the inputs of comparison amplifier 250 is connected to the connection point of resistors 246 and 247, the other input is connected to the connection point of resistors 248 and 249, and the output is connected to control circuit 251. One of the outputs of the diode bridge 242 and the control circuit 251 are connected.

The cathode of the Zener diode 261 is
Connected to terminal T7, a resistor 262 is inserted between its anode and ground. The cathode of the Zener diode 264 is connected to the cathode of the Zener diode 261, and a resistor 265 is inserted between the anode and the ground. The anode of Zener diode 264 is connected to control circuit 251. The anode of the photocoupler 266t is connected to the cathode of the Zener diode 261. The collector of the transistor 263 is the photocoupler 2
66t, the base thereof is connected to the anode of the Zener diode 261, and the emitter thereof is grounded.

FIG. 24 shows a twelfth embodiment of the present invention. FIG. 24 is an example of a set circuit for transmitting an AC operation signal. The emitter of the transistor 271 is connected to the terminal T5, and the resistor 27 is connected between its collector and base.
2 is inserted. The cathode of Zener diode 274 is connected to the base of transistor 271, and the anode is grounded via switch 276. Similarly,
The cathode of Zener diode 275 is connected to the base of transistor 271, and the anode is grounded via switch 276. The secondary battery 273 is inserted between the collector of the transistor 271 and the ground.

In FIG. 24, Zener diode 27
Since the Zener voltages of Nos. 4 and 275 are different from each other, a signal can be transmitted by switching the switch 276.

[0091]

According to the present invention, when the set is not used as the load of the AC adapter, the loss of the AC adapter can be reduced to zero. That is, power can be saved.

Also, according to the present invention, the AC
Can control the adapter. Furthermore, according to the present invention, when the capacity of the power supply (secondary battery or capacitor) used for controlling the AC adapter is reduced, the battery can be automatically charged.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of the present invention.

FIG. 2 is a block diagram showing a first embodiment to which the present invention is applied.

FIG. 3 is a block diagram illustrating an example of transmitting a signal to which the present invention is applied;

FIG. 4 is a block diagram of another example for transmitting a signal to which the present invention is applied;

FIG. 5 is a block diagram showing a second embodiment to which the present invention is applied.

FIG. 6 is a schematic diagram used to explain a switch circuit applied to the present invention;

FIG. 7 is a block diagram showing a third embodiment to which the present invention is applied.

FIG. 8 is a block diagram showing a fourth embodiment to which the present invention is applied.

FIG. 9 is a flowchart illustrating an example of turning on the switch circuit of the present invention.

FIG. 10 is a block diagram showing a fifth embodiment to which the present invention is applied.

FIG. 11 is a flowchart illustrating an example of turning off the switch circuit of the present invention.

FIG. 12 is a block diagram showing a sixth embodiment to which the present invention is applied.

FIG. 13 is a flowchart of an example of performing the charging operation of the present invention.

FIG. 14 is a block diagram showing a seventh embodiment to which the present invention is applied.

FIG. 15 is an example of a piezoelectric element applied to the present invention.

FIG. 16 is a flowchart of an example of generating a signal using the piezoelectric element of the present invention.

FIG. 17 is a block diagram showing an eighth embodiment to which the present invention is applied.

FIG. 18 is a flowchart of an example of an on / off state of the AC switch circuit and the set switch circuit of the present invention.

FIG. 19 is a flowchart of an example of performing the charging operation of the present invention.

FIG. 20 is a block diagram showing a ninth embodiment to which the present invention is applied;

FIG. 21 is a flowchart illustrating an example of turning off the switch circuit of the present invention.

FIG. 22 is a block diagram showing a tenth embodiment to which the present invention is applied.

FIG. 23 is a block diagram showing an eleventh embodiment to which the present invention is applied.

FIG. 24 is a block diagram showing a twelfth embodiment to which the present invention is applied.

FIG. 25 is a schematic diagram used for describing power consumption loss.

[Explanation of symbols]

1 AC switch circuit 2 Transformer 3
・ Diode, 4 ・ ・ ・ Capacitor, 5 ・ ・ ・ Regulator, 6 ・ ・ ・ Circuit, 7 ・ ・ ・ Set

Claims (11)

[Claims] 1. A power supply adapter connected to a commercial power supply and outputting a predetermined power, comprising: a power supply circuit connected to an electronic device through two or three terminals to generate an output power; A power supply adapter comprising: detection means for detecting a signal; and switching means for stopping or starting the output operation of the power supply circuit according to the detected signal. 2. The power supply adapter according to claim 1, wherein said switching means is turned on for a predetermined time when connected to a commercial power supply. 3. The power supply adapter according to claim 1, further comprising a backflow prevention unit for preventing backflow of voltage and current when the output operation of the power supply circuit is stopped. 4. A signal transmitting means connected to the power supply adapter through two or three terminals and transmitting a signal to the power supply adapter; a power supply for transmitting the signal; and a power supply from the power supply adapter. An electronic apparatus comprising: an output power supply; and switching means for connecting or disconnecting a load. 5. The electronic apparatus according to claim 4, wherein said signal transmission means transmits a signal for a predetermined time. 6. The apparatus according to claim 4, further comprising detecting means for detecting the supplied output power, wherein when the output power is detected, transmission of the signal from the signal transmitting means is stopped. Electronic equipment characterized by the following. 7. A signal transmission system in which a power supply adapter connected to a commercial power supply and outputting a predetermined power supply and an electronic device are connected, wherein the power supply adapter and the electronic device are connected by two terminals or three terminals, The power supply adapter includes a power supply circuit that generates an output power, a detection unit that detects a signal supplied from the electronic device, and a device that stops or starts an output operation of the power supply circuit according to the detected signal. The electronic device comprises: a signal transmission unit for transmitting a signal to the power supply adapter; a power supply unit for transmitting the signal; and an output supplied from the power supply adapter. A signal transmission system comprising a power supply and a second switching unit for connecting or disconnecting a load. 8. The signal transmission system according to claim 7, further comprising, when connected to a commercial power supply, turning on said first switching means for a predetermined time. 9. The signal transmission system according to claim 7, further comprising a backflow prevention unit for preventing backflow of voltage and current when the output operation of the power supply circuit is stopped. 10. The signal transmission system according to claim 7, wherein said signal transmission means transmits a signal for a predetermined time. 11. The electronic device according to claim 7, further comprising a detection unit for detecting the supplied output power, and transmitting the signal from the signal transmission unit when the output power is detected. A signal transmission system characterized by stopping.