JP2001286070A - Charging apparatus and charge control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a power factor when quickly carrying out charging. SOLUTION: A commercial power supply that is supplied from a terminal 11 is supplied to a switching power circuit 14 via a rectifying circuit 12 and a high-frequency filter 13. In the switching power circuit 14, power is outputted by switching according to a signal from a feedback circuit 17. In a detection circuit 15, at least one of current, voltage, and power that are outputted to a connection load is detected for supplying to a time constant circuit 16 and a time constant-switching circuit 18. In the time constant circuit 16, a time constant is changed according to a signal from the time constant switching circuit 18, and the signal is supplied to the switching power circuit 14 via the feedback circuit 17. In a capacitor switching circuit 19, the capacity of a capacitor for composing the high-frequency filter 13 is changed according to the signal from the time constant switching circuit 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device and a charging control method suitable for charging a secondary battery.

[0002]

2. Description of the Related Art Generally, rechargeable electronic devices such as a VTR-integrated digital camera and a mobile phone are charged by an AC adapter. In particular, a lithium ion secondary battery is used as a secondary battery to be charged. The reason is that the lithium ion secondary battery does not have a memory effect in which the charge / discharge characteristics change, and the charge amount can be displayed almost accurately from the battery voltage or the charge current using the characteristics of the battery. There are advantages such as little heat generation of the battery due to high efficiency.

When charging this lithium ion secondary battery, constant voltage charging is performed after constant current charging. And
In order to shorten the charging time, a high current is required at the beginning of charging. In particular, in the case of quick charging in which the electronic device can be used for about 1 hour after charging for 5 minutes, 50 W ·
It may exceed 8A. Initial charge (constant current charge)
And the constant voltage charging, the power use efficiency, the so-called power factor, changes.

As a method of improving the power factor, there has been a method of combining two power supply circuits as shown in FIG. In FIG. 21, the commercial power is supplied to the diode bridge 121 via a first input terminal T _i. The rectified power supply includes capacitors 122 and 124, inductor 12
After being supplied to the high frequency filter composed of the inductor 3, the inductor 125, the FET 126, and the pulse width modulation (PWM)
The power is supplied to a first power supply circuit including a circuit 127. The pulsed power output from the first power supply circuit is
The power is supplied to a first rectifier circuit composed of a diode 128 and a capacitor 129 and is rectified. The rectified power is supplied to a second power supply circuit including a transformer 130, an FET 131, and a pulse width modulation circuit 132. The pulsed power output from the second power supply circuit is supplied to a second rectifier circuit including a diode 133 and a capacitor 134, where the power is rectified. Thus, the power factor has been improved by combining the two power supply circuits. In some cases, two or more power supply circuits are provided to improve the power factor.

As shown in FIG. 22, an input terminal T _i
, Commercial power is supplied to the diode bridge 141. The rectified power supply includes capacitors 142, 144,
After being supplied to the high frequency filter composed of the inductor 143, it is supplied to the power supply circuit composed of the transformer 145, the FET 146, and the pulse width modulation circuit 147. The pulsed power output from the power supply circuit is a diode 1
48, and a rectifier circuit composed of a capacitor 149. In FIG. 22, the power factor is improved by replacing the capacitor 149 provided on the output side with a large-capacity capacitor.

[0006]

However, when the power factor is improved by using two or more power supply circuits, the time constant of at least one power supply circuit becomes large, and the efficiency of the switching power supply becomes poor. there were. Further, when a large-capacity capacitor is provided on the output side, the time constant becomes large, so that the efficiency of the switching power supply deteriorates as described above.

Accordingly, an object of the present invention is to provide a charging apparatus and a charging control method capable of improving the power factor when performing rapid charging without deteriorating the efficiency of the switching power supply.

[0008]

According to a first aspect of the present invention, there is provided a charging apparatus for converting a commercial power supply input into a charging power supply, a high-frequency filter for rectifying the supplied commercial power, switching power supply means, Output current,
Detecting means for detecting at least one of voltage and electric power, and switching a capacitance of a capacitor provided on an output side of the high-frequency filter and a time constant provided on the switching power supply according to a detection result obtained from the detecting means. A charging device comprising control means.

[0009] The invention according to claim 8 is a charging control method for converting a commercial power input to a charging power,
Operating at a first power, a first current of the first power and / or
Alternatively, a voltage is detected, and it is determined whether or not the detected first current and / or voltage is equal to or greater than a threshold. When it is determined that the detected first current and / or voltage is equal to or greater than the threshold, Increase the time constant provided in the switching power supply,
The capacity of the capacitor used in the rectifier circuit is reduced, the capacitor operates at a second power larger than the first power, detects a second current and / or voltage of the second power, and detects the detected second power. Is determined whether or not the current and / or voltage of the second power supply is less than the threshold value, and when it is determined that the detected second current and / or voltage is less than the threshold value, the time constant provided in the switching power supply is reduced. Or a charge control device characterized in that the capacity of a capacitor provided in a rectifier circuit is increased.

[0010] The capacity of a capacitor used in the rectifier circuit is switched based on at least one of the input current, voltage and power of the commercial power supply, and the value of a time constant provided in the switching power supply circuit is switched. This improves the power factor when outputting large power.
Further, the threshold of the current detection circuit is switched or changed based on at least one of the current, the voltage, and the power.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an AC adapter to which the present invention is applied. Commercial power supplied from the terminal 11 is rectified by the rectifier circuit 12 and the high frequency filter 13 and supplied to the switching power supply circuit 14. In the switching power supply circuit 14, a switching operation is performed according to a signal supplied from the feedback circuit 17, and power is output. The detection circuit 15 detects at least one of a current, a voltage, and a power output to an electronic device (hereinafter, referred to as a connection load) connected to the terminal 20. The detected value is supplied to the time constant circuit 16 and the time constant switching circuit 18.

In the time constant switching circuit 18, a signal for switching the time constant according to the detected value is output from the time constant circuit 16.
And to the capacitor switching circuit 19. In the time constant circuit 16, the time constant switching circuit 1
The time constant is switched according to the signal from the control signal 8, and the signal is supplied to the switching power supply circuit 14 via the feedback circuit 17. In the capacitor switching circuit 19, a signal for switching the capacitance of the capacitor forming the high frequency filter 13 is supplied to the high frequency filter 13 according to the signal supplied from the time constant switching circuit 18.

For example, when performing rapid charging, constant current charging is performed as shown in FIG.
It may exceed 8A. Therefore, when an output in the area a is detected, the power factor is set to 80% or more.
The time constant of the time constant circuit 16 and the capacitor of the high frequency filter 13 are switched. By doing so, it is possible to improve the power factor when outputting large power.

In this embodiment, in order to improve the power factor, the time constant of the time constant circuit 16 is increased, and the capacitance of the rectified output capacitor is changed. Accordingly, as shown in FIG. 3, the relationship between the voltage V and the current I can be modulated. This figure 3
When the current I and the voltage V are in phase as shown in FIG.
00%. Therefore, the power factor can also be said to be the phase difference between the voltage and the current.

FIG. 4 is a circuit diagram of a first embodiment of the AC adapter according to the present invention. Commercial power is supplied through a terminal T _i. The rectifier circuit 12 includes a filter 21, a diode bridge 22, and a capacitor 2.
3, 25, 26 and the inductor 24.
Also, the capacitors 23, 25, 26 in the rectifier circuit 12
The high frequency filter 13 is composed of the inductor 24 and the inductor 24. The switching power supply circuit 14 includes a transformer 29, F
The ET 30 includes a pulse width modulation (PWM) circuit 31 and a resistor 34. A diode 37,
A rectifier circuit including a capacitor 38 is provided.
The FET 30 is provided with a parasitic diode 30a.

As the detection circuit 15, a current detection circuit 35 and a voltage detection circuit 39 are provided. The time constant circuit 33 corresponds to the time constant circuit 16, and the feedback circuit 32
The release circuit 36 corresponds to the time constant switching circuit 18, and the control circuit 28 corresponds to the capacitor switching circuit 19. Plugged load is supplied via a terminal T _o.

In the first embodiment shown in FIG. 4, a current flowing through the transformer 29 is detected by a current detection circuit 35. For example, when the current detection circuit 35 detects a current of 8 A or more, a signal is supplied to the release circuit 36. In the release circuit 36, when a signal is supplied from the current detection circuit 35,
A signal is supplied to the control circuit 28 and the time constant circuit 33. In the control circuit 28, when a signal is supplied from the release circuit 36, the FET 27 is turned off. Time constant circuit 3
In 3, when a signal is supplied from the release circuit 36, the time constant is increased.

Similarly, the voltage output to the connection load is detected by the voltage detection circuit 39. For example, the voltage detection circuit 39
When a voltage equal to or higher than the predetermined voltage is detected, a signal is supplied to the time constant circuit 33. In the time constant circuit 33, when a signal is supplied from the voltage detection circuit 39, the time constant is increased.

For example, when the current flowing through the connection load increases as in the region a shown in FIG.
Is turned off so that the high-frequency filter 1
The capacity of the capacitor on the output side of No. 3 is only the capacity of the capacitor 25. Similarly, the time constant set by the time constant circuit 33 is also increased. This improves the power factor.

On the other hand, as shown in a region b in FIG.
When the power output to the connected load is small, ie, FE
When the current flowing through T30 is small, the FET 27 is turned on and the capacitor 26 is connected. By connecting the capacitor 26, the capacitance of the capacitor on the output side of the high frequency filter 13 becomes a combined capacitance of the capacitors 25 and 26, and the switching power supply circuit 14 performs a normal switching operation.

At this time, the capacitance C of the capacitor 25_{twenty five}When,
Capacitance C of capacitor 26₂₆Means C _{twenty five}≪C₂₆Relationship
become. Therefore, in the current detection circuit 35, 8A or more
When a current is detected, the time
The constant on the output side of the high-frequency
Reduce the capacity of the sensor. Also, the voltage detection circuit 39
When a voltage equal to or higher than the predetermined voltage is detected, the time constant increases.
Will be heard

Next, another example of the first embodiment is shown in FIG. Power output from the rectifier circuit consisting of diode 37 and capacitor 38 is through the resistor 45 from the output terminal T _o to the connected load. The current supplied to the connection load is detected by the current detection circuit 46, and the voltage supplied to the connection load is detected by the voltage detection circuit 49. In the current detection circuit 46, the detected current is supplied to the addition circuit 48. Further, in the current detection circuit 46, for example, when a current of 8 A or more is detected, the switching detection circuit 4
The signal is supplied to 7. In the voltage detecting circuit 49, the detected voltage is supplied to the adding circuit 48. When a voltage equal to or higher than a predetermined voltage is detected by the voltage detection circuit 49, a signal is supplied to the switching circuit 47.

In the addition circuit 48, the current from the current detection circuit 46 and the voltage from the voltage detection circuit 49 are added. The addition signal is supplied to the time constant circuit 42 or the pulse width modulation circuit 31 via the switch circuit 43. In the time constant circuit 42, the supplied addition signal is supplied to the pulse width modulation circuit 31 after a predetermined time constant. In the pulse width modulation circuit 31, ON / OFF of the FET 30 is controlled according to the supplied signal. In the switching circuit 47, the signal from the current detection circuit 46 and / or the current detection circuit 4
9 is supplied to the control circuit 44. Control circuit 4
In 4, the switch circuits 41 and 43 are controlled according to the supplied signal.

Here, especially when it is detected that a large amount of electric power is supplied to the connection load at the beginning of charging, the switch circuit 41
Is turned off, and the switch circuit 43 is controlled by the control circuit 44 so as to supply the addition signal from the addition circuit 48 to the time constant circuit 42. For example, when it is detected that power of 50 W or more is being supplied to the connection load, it is determined that large power is being supplied to the connection load.
At this time, from the input terminal T _i, power is supplied as shown in FIG. 3, from the output terminal T _o, a current shown in FIG. 6 is output.

When it is detected that small power is being supplied to the connection load, the switch circuit 41 is turned on, and the switch circuit 43 supplies the addition signal from the addition circuit 48 to the pulse width modulation circuit 31. Control circuit 4
4. At this time, from the input terminal T _i, power is supplied as shown in FIG. 7, from the output terminal T _o,
The voltage and current shown in FIG. 8 are output.

FIG. 9 shows a schematic configuration of the first embodiment of FIGS. 4 and 5 described above. The voltage and / or current detected by the voltage / current detection circuit 59 provided on the secondary side of the transformer 29 is supplied to the feedback signal circuit 56 and the switching signal circuit 57. In the feedback signal circuit 56,
The supplied signal is supplied to the pulse width modulation circuit 31.
In the switching signal circuit 57, the supplied signal is supplied to the switching signal. The switching circuit 52 controls on / off of the switches 51 and 55 according to the supplied signal.

For example, in the voltage / current detection circuit 59,
As shown in FIG. 10, when a current equal to or greater than the time point a, for example, a current equal to or greater than 8 A is detected, the switch circuit 51 is turned off and the switch circuit 55 is turned on. As shown in FIG. 10, when the voltage / current detection circuit 59 detects a current less than the time point a, for example, a current less than 8 A, the switch circuit 51 is turned on and the switch circuit 55 is turned off. The signal b shown in FIG. 10 is a feedback detection signal.

In the voltage / current detection circuit 59, 5
The control of the switch circuits 51 and 55 may be performed depending on whether or not the power of 0 W or more is detected. In the example shown in FIG. 9, when the switch circuit 55 is turned on, the capacitor 54 is connected, that is, the time constant circuit is connected, and when the switch circuit 55 is turned off, the capacitor 54 is disconnected.

The operation of the first embodiment will be described with reference to the flowchart shown in FIG. In step S1, this AC adapter operates with low power. In step S2, the current supplied to the connection load is detected. In step S3, it is determined whether the detected current is equal to or greater than a predetermined value. If it is determined that the current is equal to or greater than the predetermined value, the control proceeds to step S4. If it is determined that the current is not equal to or greater than the predetermined value, the control proceeds to step S2. Returns. In step S4, the time constant is increased. In step S5, the capacitance of the capacitor on the output side of the high frequency filter 13 is switched, and the capacitance is reduced.

In step S6, the AC adapter operates with high power. In step S7, the current supplied to the connection load is detected. In step S8, it is determined whether the detected current is less than the predetermined value. If it is determined that the current is less than the predetermined value, the control proceeds to step S9. If it is determined that the current is not less than the predetermined value, the control proceeds to step S7. Return. In step S9, the time constant is reduced or disconnected. In step S10, the capacitance of the capacitor on the output side of the high frequency filter 13 is switched, and the capacitance is increased.

In the flowchart shown in FIG.
Although the C adapter operates first with low power, it may operate with high power first. In that case, the algorithm is started from step S6.

Here, a second embodiment of the present invention will be described with reference to FIG. The above-described switching circuit 52 includes:
It comprises resistors 61, 63, an NPN transistor 62, and a Zener diode 64. Switching circuit 52
The power required for the operation of the device is obtained from the connection point between the inductor 24 and the capacitor 25. Feedback signal circuit 5
6 is configured by a photocoupler 70, and the switching signal circuit 57 is configured by a photocoupler 71. The switch circuit 51 is configured by the FET 27, and the switch circuit 55 is
An FET 69 is provided.

In the current detection circuit 72, when the power supply flowing to the connection load flows as shown in FIG. 13, when the current exceeding the time point c is not detected, for example, when the current exceeding 8A is not detected , Is supplied to the LED 71 a of the photocoupler 71 via the time constant circuit 75. When the LED 71a emits light, the phototransistor 71b of the photocoupler 71 turns on. That is, the photo coupler 71 is turned on. When the photocoupler 71 is turned on, the transistor 62 is turned off, and the FET 27
And 69 are turned on. When the FET 27 is turned on, the capacitance of the capacitor 25 is
And 26 are switched to the combined capacity. Similarly, FE
When T69 is turned on, the pulse width modulation circuit 3
The time constant provided in 1 is switched from the capacity of the capacitor 67 to the combined capacity of the capacitors 67 and 68.

When the current detecting circuit 72 detects a current exceeding 8 A, no signal is supplied to the LED 70a of the photocoupler 70. Therefore, the photocoupler 70 is turned off. When the photocoupler 70 turns off, the transistor 62 turns on, and the FETs 27 and 69 turn off. When the FET 27 is turned off, the combined capacitance of the capacitors 25 and 26 is switched to the capacitance of the capacitor 25. Similarly, FET 69
Is turned off, the time constant provided in the pulse width modulation circuit 31 is switched from the combined capacitance of the capacitors 67 and 68 to the capacitance of the capacitor 67.

The current detected by the current detection circuit 74 is supplied to the LED 70 of the photocoupler 70 via a resistor 76.
a. The voltage detected by the voltage detection circuit 77 is supplied to the LED of the photocoupler 70 via the resistor 78.
70a. The LED 70a is connected to the current detection circuit 7
4 and / or emits light when a signal is supplied from the voltage detection circuit 77. When the LED 70a emits light, the phototransistor 70b of the photocoupler 70 turns on. The pulse width modulation circuit 31 controls the FET 30 according to the duty ratio at which the photocoupler 70 turns on / off.

A third embodiment of the present invention will be described with reference to FIG. Even if the output power is the same, the output current changes according to the input voltage. Therefore, in the third embodiment, the threshold for comparing the detected output current is changed according to the input voltage. is there.

The resistors 81 and 82 are connected in series between the connection point of the inductor 24 and the capacitor 25 and the ground. The connection point between resistors 81 and 82 is connected to voltage detection circuit 83. The voltage detection circuit 83 detects an input voltage. The detected input voltage is supplied to a voltage detection circuit 83
To the current detection switching circuit 84. In the current detection switching circuit 84, as shown by the characteristic d in FIG.
When the input voltage is 200 V or more, the threshold set by the current detection circuit 89 is set to 0.5 A, and the input voltage is set to 200 V
In the following cases, the threshold value set by the current detection circuit 89 is 1A. In the current detection switching circuit 84, a control signal is supplied to the current detection circuit 89 so that the threshold value of the current detection circuit 89 is changed according to the detected input voltage. In the current detection circuit 89, a threshold value is set according to the supplied control signal. When a current larger than the set threshold value is detected, a signal is supplied from the current detection circuit 89 to the control circuit 86. In the control circuit 86,
As described above, when a current larger than the set threshold is detected, the switch circuit 85 is turned off and the switch circuit 88 is turned on.

In the third embodiment, the threshold value set in the current detection circuit 89 is switched so as to select one of 0.5 A and 1 A. The threshold value shown in FIG.
As shown in (1), it may be changed in an analog manner.

The operation of the third embodiment will be described with reference to the flowchart shown in FIG. Step S21
Then, the input voltage is detected in the voltage detection circuit 83. In step S22, it is determined whether or not the detected input voltage is a voltage for switching the threshold of current detection circuit 89. If it is determined that the detected input voltage is a voltage for switching the threshold, the control moves to step S23,
When it is determined that the voltage is not the one for switching the threshold value, the control returns to step S21. In step S23, the threshold value of the current detection circuit 89 is switched.

For example, when a voltage of 200 V or more is detected by the voltage detection circuit 83 while the AC adapter is operating with low power, the threshold value of the current detection circuit 89 is switched from 1 A to 0.5 A. . Also, when the voltage of 200 V or less is detected by the voltage detection circuit 83 while the AC adapter is operating with high power, the threshold value of the current detection circuit 89 is switched from 0.5 A to 1 A.

In step S31, the current is detected by the current detection circuit 89. In step S32, it is determined whether or not the detected current is equal to or greater than the threshold value set by current detection circuit 89. If it is determined that the detected current is equal to or larger than the threshold, the control moves to step S33,
If it is determined that it is not equal to or more than the threshold value, step S31
The control returns to. In step S33, the time constant provided in the pulse width modulation circuit 31 is increased. Step S3
4, the FET 27 is turned off, and the high-frequency filter 13 is turned off.
The capacity of the capacitor provided on the output side of is reduced. That is, the combined capacitance of the capacitors 25 and 26 is switched to the capacitance of only the capacitor 25. In step S35, this AC adapter operates with high power.

In step S36, the current is detected by the current detection circuit 89. In step S37, it is determined whether or not the detected current is less than the threshold value set by current detection circuit 89. If it is determined that the detected current is less than the threshold, the control proceeds to step S38,
If it is determined that it is not less than the threshold value, the control returns to step S36. In step S38, the pulse width modulation circuit 3
The time constant provided in 1 is small. Or, the time constant is disconnected. In step S39, the FET 27 is turned on, and the capacitance of the capacitor provided on the output side of the high frequency filter 13 is increased. That is, capacitor 2
The capacity is switched from the capacity of only 5 to the combined capacity of the capacitors 25 and 26. In step S40, this AC adapter operates with low power.

In the flowchart shown in FIG. 16, the threshold value of the current detection circuit 89 is switched according to the detected input voltage. When the threshold value is switched as shown by the dotted line in FIG. S32 and S37
The detected currents are compared with the switched threshold.

In the flowchart shown in FIG. 16, the threshold value set by current detection circuit 89 is selected from either 0.5 A or 1 A in accordance with the detected input voltage. As shown by the characteristic e in FIG.
A current serving as a threshold according to the detected input voltage may be set in the current detection circuit 89.

A modification which can be provided in the first, second and third embodiments will be described with reference to FIG. A time constant circuit 91 is provided between the source of the FET 30 and the ground. After the time constant set by the time constant circuit 91, power is supplied to the current detection circuits 92 and 93. As an example, the current detection circuit 92 detects a large current, and the current detection circuit 93 detects a small current. In this modification, a large power is output from the AC adapter as shown in a range f in FIG. 18, and a small power is output as shown in a range g in FIG. In this time constant circuit 91, as shown at time point h, the current is not affected by the 50/60 Hz waveform, that is, the zero current is supplied to the current detection circuits 92 and 9.
The time constant is set so as not to be detected in step 3.

As shown in FIG. 19, the detection circuit 101 provided on the secondary side of the transformer 29 also has a 50/6
The time constant is set so as not to be affected by the 0 Hz waveform, and at least one of current, voltage and power is detected.

FIG. 20 shows an example of the time constant circuit 91 and the current detection circuit 92 described above. The time constant circuit 91 composed of the resistor 112 and the capacitor 113
0 is connected to the source. A connection point between the resistor 112 and the capacitor 113 is connected to a non-inverting input terminal of the operational amplifier circuit 117. A resistor 116 is inserted between the inverting input terminal of the operational amplifier circuit 117 and the ground. A resistor 114 and a voltage source 115 are provided in parallel with the resistor 116.

As described above, the time constant set by the time constant circuit 91 is set to a time constant larger than the frequency of 50/60 Hz. As a condition for detecting at least one of the current, the voltage, and the power, a time constant larger than a frequency of 50/60 Hz is set. Further, the time constant is set so as to be longer than one cycle or half cycle generated by the switching operation of the FET 30.

In the embodiment described above, the pulse width modulation circuit 31 is used to control the FET 30, but a pulse width modulation circuit including an oscillator may be used.

[0050]

According to the present invention, in quick charging,
In the case of outputting large power, the operation of setting the power factor to about 80% is performed. In the case of outputting small power, the time constant provided in the switching power supply is reduced or separated.
Since the switching power supply can be switched between efficient operation and use, the range of use is expanded.

Further, according to the present invention, since it is not necessary to use two or more power supply circuits, 50
/ 60 Hz ripple voltage can be eliminated. Therefore,
The efficiency of the switching power supply can be improved.

[Brief description of the drawings]

FIG. 1 shows a block diagram of an embodiment of an AC adapter to which the present invention is applied.

FIG. 2 is a voltage / current characteristic diagram used to explain the present invention.

FIG. 3 is a voltage / current characteristic diagram used to explain the present invention.

FIG. 4 is a circuit diagram according to the first embodiment of the present invention.

FIG. 5 is a circuit diagram of another example of the first embodiment of the present invention.

FIG. 6 is a characteristic diagram of a current used for explaining the present invention.

FIG. 7 is a voltage / current characteristic diagram used to explain the present invention.

FIG. 8 is a characteristic diagram of voltage and current used to explain the present invention.

FIG. 9 is a schematic configuration of the first embodiment of the present invention.

FIG. 10 is a voltage / current characteristic diagram used to explain the present invention.

FIG. 11 is a flowchart illustrating an example of an operation according to the first exemplary embodiment of the present invention.

FIG. 12 is a circuit diagram according to a second embodiment of the present invention.

FIG. 13 is a voltage / current characteristic diagram used to explain the present invention.

FIG. 14 is a circuit diagram according to a third embodiment of the present invention.

FIG. 15 is a voltage / current characteristic diagram used to explain the present invention.

FIG. 16 is a flowchart for explaining an example of the operation of the third embodiment of the present invention.

FIG. 17 is a block diagram of a modification that can be applied to the present invention.

FIG. 18 is a characteristic diagram of a current used for describing the present invention.

FIG. 19 is a block diagram of a modification that can be applied to the present invention.

FIG. 20 is a block diagram of a modification that can be applied to the present invention.

FIG. 21 is an example of a conventional AC adapter.

FIG. 22 is another example of a conventional AC adapter.

[Explanation of symbols]

12 rectifier circuit, 13 high frequency filter, 14
... Switching power supply circuit, 15 ... Detection circuit, 1
6 ... time constant circuit, 17 ... feedback circuit, 18 ...
Time constant switching circuit, 19: capacitor switching circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02M 7/12 H02M 7/12 P (72) Inventor Kazuo Yamazaki 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation F-term (reference) 5G003 AA01 BA01 CA04 CA14 CC02 GA01 GB04 5H006 AA02 CA02 CA07 CB01 CB03 CC08 DA02 DA04 DC02 DC05 5H030 AA02 AS11 BB01 FF43 FF52 5H730 AA18 AS17 BB43 BB57 CC04 DD04 FD01 FD02 FG05

Claims (9)

[Claims] 1. A charging apparatus configured to convert a commercial power supply input to a charging power supply, a high-frequency filter for rectifying the supplied commercial power, switching power supply means, and at least one of output current, voltage, and power. And a control means for switching a capacitance of a capacitor provided on the output side of the high-frequency filter and a time constant provided in the switching power supply according to a detection result obtained from the detection means. A charging device, comprising: 2. The charging device according to claim 1, wherein the detection means is provided on a primary side and / or a secondary side of a transformer of the switching power supply. 3. The switching of the control means, when a detection result obtained from the detection means exceeds a predetermined value, reducing a capacity of a capacitor provided on an output side of the high frequency filter and providing the switching power supply with the switching power supply. If the detection result obtained from the detection means does not exceed a predetermined value, the capacitance of the capacitor provided on the output side of the high-frequency filter is increased, and the capacitance is provided in the switching power supply. 2. The charging device according to claim 1, wherein the time constant is reduced or separated. 4. The charging device according to claim 1, wherein a threshold value set in said detection means is changed or switched according to a commercial power supply input. 5. The charging device according to claim 1, wherein a time constant is provided in said detecting means. 6. The time constant provided in the switching power supply or the time constant provided in the detecting means has a value larger than one cycle or 周期 cycle. 6. The charging device according to 1 or 5. 7. The method according to claim 1, wherein the time constant provided in the switching power supply or the time constant provided in the detection means has a value larger than 50/60 Hz. The charging device as described. 8. A charging control method for converting a commercial power supply input into a charging power supply, wherein the charging control method operates with a first power, detects a first current and / or a voltage of the first power, and detects the detected first current and / or voltage. Determining whether the first current and / or voltage is equal to or higher than a threshold, and providing the switching current when the detected first current and / or voltage is equal to or higher than the threshold. The time constant is increased, the capacitance of the capacitor used in the rectifier circuit is reduced, and the second power and / or the second power of the second power is operated with a second power larger than the first power. It is determined whether or not the detected second current and / or voltage is less than the threshold, and it is determined that the detected second current and / or voltage is less than the threshold The above switching power A charging control device, characterized in that a time constant provided in a power source is reduced or separated, and a capacity of the capacitor provided in the rectifier circuit is increased. 9. An input voltage is detected, and the threshold is changed according to the detected voltage.
Or switching is performed.
A charge control device according to claim 1.