JP2012165546A - Charging system, electronic apparatus and charging apparatus - Google Patents

Charging system, electronic apparatus and charging apparatus Download PDF

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JP2012165546A
JP2012165546A JP2011023544A JP2011023544A JP2012165546A JP 2012165546 A JP2012165546 A JP 2012165546A JP 2011023544 A JP2011023544 A JP 2011023544A JP 2011023544 A JP2011023544 A JP 2011023544A JP 2012165546 A JP2012165546 A JP 2012165546A
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charging
voltage
current
built
constant
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JP2011023544A
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Japanese (ja)
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Yukihiro Niekawa
幸大 贄川
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Konica Minolta Medical & Graphic Inc
コニカミノルタエムジー株式会社
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Abstract

A charging system capable of achieving both a large current in constant current charging and high-accuracy current detection in constant voltage charging is provided.
A charging system 100, after the charged voltage V which is charged in the internal power supply 24 is subjected to constant current charging until the target voltage V 0 is controlled charging of the internal power supply 24 is switched to constant voltage charging A charging control circuit 80 for detecting the charging voltage V, a charging voltage detecting unit 83 for detecting the charging voltage V, a charging current detecting unit 84 for detecting a potential difference Δv between both electrodes of the current detecting resistor 91, And a switching control unit 85 that controls the supply of power to the built-in power supply 24 in accordance with the charging voltage V and the potential difference Δv. The current detection resistor unit 91 is formed by connecting a plurality of resistors 91a and 91b in parallel. The charge control circuit 80 cuts off some of the resistors 91b among the plurality of resistors 91a and 91b energized at the time of constant current charging from the charging current path 81 at least during constant voltage charging.
[Selection] Figure 8

Description

  The present invention relates to a charging system, an electronic device, and a charging device, and more particularly to a charging system that charges a built-in power source of an electronic device with the charging device.

  Various charging devices, charging control devices, and the like have been developed for charging a rechargeable built-in power source (also referred to as a battery, a secondary battery, or a power storage device) built in an electronic device (for example, Patent Documents 1 to 4). Etc.).

  Such a charging device or the like includes a charging voltage detection unit that detects a charging voltage charged in the built-in power source, and a current that flows in a wiring (hereinafter referred to as a charging current path) that supplies power to the built-in power source of the electronic device. There is a case in which a charging control circuit provided with a charging current detection unit or the like for detecting is provided. Alternatively, such a charging control circuit may be provided on the electronic device side.

  The charging control circuit feeds back to the switching control unit information on the charging voltage charged in the built-in power source detected by the charging voltage detection unit and information on the current flowing in the charging current path detected by the charging current detection unit, Accordingly, the internal power supply of the electronic device is charged while the switching control unit controls the supply of power supplied from the external power supply to the internal power supply.

  At that time, as described in Patent Document 1 and the like, in a state where the charging voltage charged in the built-in power source is small, charging is performed so that the charging current is constant (that is, constant current charging), and the charging voltage is set. However, for example, when a predetermined voltage value set to the upper limit value of the voltage value that can be charged to the built-in power supply or the like is reached, further charging (that is, constant voltage charging) is performed so that the charging voltage becomes constant. May be configured as follows.

  The reason for adopting such a charging method is as follows. That is, it is assumed that the charging voltage of the built-in power supply detected by the charging voltage detection unit becomes a predetermined voltage value set to the upper limit value of the voltage value that can be charged to the built-in power supply during constant current charging. However, since there is a voltage drop due to resistance in the built-in power supply or the charging current path of the charge control circuit, the charge voltage of the built-in power supply is actually a predetermined voltage value such as the upper limit of the voltage value that can be charged. Is not reached.

  Therefore, the charging voltage detected by the charging voltage detection unit is monitored by the switching control unit so that it does not exceed the predetermined voltage value, and the charging voltage is made constant, that is, the predetermined voltage value described above. Thus, constant voltage charging is performed to bring the actual charging voltage of the built-in power supply closer to the predetermined voltage value.

  However, if charging is performed until the actual charging voltage of the built-in power supply reaches the predetermined voltage value, it usually takes a very long time.

  Therefore, after switching the charging method from constant current charging to constant voltage charging, it is noted that the value of the current flowing in the charging current path detected by the charging current detection unit is attenuated and becomes smaller. When the value of the current after switching to charging is equal to or less than a threshold value set to a small value such as 0.1 [A] in advance, the supply of power from the charging device to the electronic device is stopped, Often configured to terminate charging of an electronic device.

JP 2009-77501 A JP 2008-104270 A JP 2007-306654 A JP 2006-33917 A

  Incidentally, in recent years, lithium ion capacitors (LIC) have been developed as built-in power sources for electronic devices and the like. The lithium ion capacitor has excellent performance such as that the voltage of the conventional electric double layer capacitor can be improved to about 4 [V], whereas the voltage is about 3 [V]. Yes.

  However, when the amount of electric power (or energy) that can be stored in the built-in power supply increases as described above, charging is performed by flowing a relatively small current (for example, 1 [A]) as in the prior art. It takes a very long time. For this reason, it is desired to charge in a shorter time by flowing a relatively large current (for example, 10 [A], etc.) particularly during constant current charging.

  As described in each of the above patent documents, the charging current detection unit usually measures the potential difference between the two electrodes of the current detection resistance unit inserted in the charging current path in the charging control circuit, and performs charging. In many cases, it is configured to detect a potential difference corresponding to the current flowing through the current path.

  In such a case, if a large current is caused to flow through the charging current path as described above, there is a problem in that the loss of power at the current detection resistor portion inserted in the charging current path increases.

  In addition, when a large current such as 10 [A] is passed through the charging current path in order to shorten the charging time during constant current charging, the potential difference between the two poles of the current detecting resistor inserted in the charging current path. Becomes larger. Therefore, it is necessary for the charging current detection unit to set a large range of potential difference values to be detected so that a large value of the current flowing in the charging current path can be accurately detected.

  On the other hand, after switching to constant voltage charging, as described above, the charging current detection unit accurately detects the value of the current flowing through the charging current path that has been attenuated and reduced, and the current value is determined in advance. It is necessary to accurately determine whether or not the threshold value is less than or equal to the threshold value set to a small value. Therefore, the charging current detection unit can accurately detect a small value of the current flowing in the charging current path based on a small potential difference between both poles of the current detecting resistor inserted in the charging current path. It will be necessary.

  However, as is well known, the potential difference between the two poles of the resistance measured using the scale of the potential difference whose value range is expanded to correspond to a current such as 10 [A] as described above, For example, if it is configured to determine whether or not the potential difference is equal to or lower than the threshold value set to 0.1 [A] or the like, the accuracy of detection and determination is reduced, and the accuracy of control is coarsened. Such a problem also arises.

  The present invention has been made in view of the above-described problems, and is a charging system, electronic device, and charging capable of achieving both a large current in constant current charging and highly accurate current detection in constant voltage charging. An object is to provide an apparatus.

  In addition, the present inventors have studied the configuration of a charging device, a charging control circuit, etc. in order to solve each of the above problems, and can not only solve the above problems but also perform simple control. With the configuration, it was possible to accurately perform the constant current charging and the constant voltage charging as described above, and it was possible to find a configuration capable of improving the charging efficiency.

  Therefore, the present invention can improve charging efficiency by accurately controlling constant current charging and constant voltage charging by accurately controlling current and voltage supplied to the built-in power source of an electronic device with a simple control configuration. Another object is to provide a charging system, an electronic device, and a charging device.

In order to solve the above problem, the charging system of the present invention is:
An electronic device with a built-in rechargeable power supply,
The charging is performed by performing constant current charging so that the charging current is constant until the charging voltage charged in the built-in power source reaches the target voltage, and after the charging voltage reaches the target voltage. Is switched to constant voltage charging that performs charging so that the charging voltage is constant, and a charging control circuit that controls charging to the built-in power source of the electronic device;
A charging device for supplying power to the built-in power source of the electronic device via the charging control circuit;
With
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charge control circuit cuts off some of the plurality of resistors energized at the time of constant current charging from the charging current path at least during constant voltage charging.

  According to the charging system, the electronic device, and the charging device of the system as in the present invention, when performing constant current charging in which a large current flows in the charging current path, a plurality of resistors constituting the current detection resistor unit are connected in parallel. By energizing as a connected state and lowering the resistance value of the entire current detection resistor unit, the potential difference between the two poles of the current detection resistor unit fed back from the charge current detection unit of the charge control circuit to the switching control unit is reduced. Decrease the value.

  On the other hand, during constant voltage charging in which a small current flows through the charging current path, some of the plurality of resistors constituting the current detection resistance section that was energized during constant current charging are removed from the charging current path. By cutting off and increasing the resistance value of the entire current detection resistor unit, the value of the potential difference between the two poles of the current detection resistor unit fed back from the charging current detection unit to the switching control unit is increased.

  Therefore, it is possible to accurately detect the potential difference between the two electrodes of the current detection resistor during constant voltage charging using a scale of the potential difference range used during constant current charging. It is possible to accurately determine whether or not to terminate voltage charging.

  Therefore, unlike the conventional charge control circuit, it is possible to prevent the accuracy of the judgment about the potential difference between the two electrodes of the current detecting resistor 91 during constant voltage charging from being lowered and the control accuracy from becoming rough, thereby preventing the constant. Current detection in voltage charging can be performed with high accuracy, and not only constant current charging but also constant voltage charging can be performed accurately.

  In addition, when constant current charging is performed, the resistance value of the entire current detection resistor unit is lowered, so that a large current of, for example, 10 [A] can be passed through the charging current path. It is possible to reduce the current and charge time. In addition, at the time of constant current charging, since the resistance value of the entire current detection resistor portion is lowered, it is possible to further reduce the power loss in the current detection resistor portion.

It is a perspective view which shows the external appearance of the radiographic imaging apparatus as an example of an electronic device. It is sectional drawing which follows the XX line of FIG. It is a block diagram showing the circuit structure of the radiographic imaging apparatus of FIG. It is a perspective view which shows the external appearance of the cradle as an example of a charging device. It is the perspective view which showed the state by which the radiographic imaging apparatus was inserted in the cradle shown in FIG. It is the figure which showed typically the internal structure of the cradle of FIG. 4, and has shown the state which is going to insert a radiographic imaging apparatus in a cradle. It is the figure which showed typically the internal structure of the cradle of FIG. 4, and has shown the state by which the radiographic imaging apparatus was inserted in the cradle. It is a block diagram which represents roughly the circuit structure etc. of the charge control circuit in 1st, 2nd embodiment. It is a graph showing the time change etc. of the value of the electric current which flows through a charging current path | route in 1st Embodiment, and the value of the charging voltage of a built-in power supply. It is a graph showing that a voltage drop becomes large when the value of the current passed through the charging current path is large during constant current charging. It is a graph showing the time change etc. of the value of the electric current which flows through a charging current path | route in 2nd Embodiment, and the value of the charging voltage of a built-in power supply. It is a block diagram which represents roughly the circuit structure etc. of the charge control circuit in 3rd Embodiment. FIG. 9 is a block diagram schematically illustrating a relationship between a charging control circuit, a cradle, and a radiographic imaging device when the charging control circuit is provided in a cradle that is a charging device in the case of FIG. 8.

  Hereinafter, embodiments of a charging system, an electronic device, and a charging device according to the present invention will be described with reference to the drawings.

  In the following description, a case where the electronic device is a radiographic imaging device (Flat Panel Detector: FPD) and the charging device is a cradle will be described, but the present invention is not limited to this mode.

[First Embodiment]
In the first embodiment according to the present invention, a case where a charging control circuit 80 (see FIG. 8 described later) is provided in the radiographic image capturing apparatus 1 as an electronic device will be described.

[Configuration example of radiation imaging apparatus as an example of electronic equipment]
Here, first, a configuration example of the radiation image capturing apparatus 1 will be briefly described as an example of the electronic apparatus. FIG. 1 is a perspective view showing an external appearance of the radiographic image capturing apparatus, and FIG. 2 is a cross-sectional view taken along line XX of FIG.

  As shown in FIGS. 1 and 2, the radiographic image capturing apparatus 1 is configured by housing a sensor panel SP including a scintillator 3, a substrate 4, and the like in a housing 2. In this embodiment, the housing | casing 2 is formed by obstruct | occluding the opening part of the both sides of 2 A of hollow square cylindrical housing main-body parts which have the radiation-incidence surface R with lid | cover members 2B and 2C.

  As shown in FIG. 1, the lid member 2 </ b> B on one side of the housing 2 has a power switch 37, a changeover switch 38, a connector 39, a built-in power supply 24 (see FIG. 2 and FIG. 3 described later), and radiographic imaging. An indicator 40 composed of LEDs or the like for displaying the operating state of the apparatus 1 is disposed. As will be described later, in this embodiment, the radiographic imaging apparatus 1 is connected from the cradle 60 as a charging device by connecting the connector 39 to a connector 71 (see FIGS. 6 and 7 described later) of the cradle 60 described later. The power is supplied to the.

  Although not shown in the drawings, in the present embodiment, an antenna device 41 (to be described later) is used for the radiographic imaging device 1 to transmit and receive signals and the like to and from an external device on the lid member 2C on the opposite side of the housing 2. 3) is provided so as to be embedded in the lid member 2C, for example.

  As shown in FIG. 2, a base 31 is disposed inside the housing 2 via a lead thin plate (not shown) on the lower side of the substrate 4, and an electronic component 32 and the like are disposed on the base 31. The PCB substrate 33, the built-in power supply 24, and the like are attached. Further, a glass substrate 34 for protecting the substrate 4 and the radiation incident surface R of the scintillator 3 is disposed, and a buffer material 35 is provided between the sensor panel SP and the side surface of the housing 2. ing.

  Although not shown, a plurality of radiation detection elements 7 made of photodiodes or the like are arranged in a two-dimensional shape (matrix shape) on the detection portion P of the substrate 4, and each radiation detection element 7 is used as a switch element. A thin film transistor (hereinafter referred to as TFT) 8, a scanning line 5, a signal line 6, a bias line 9 and the like are connected. Further, the scintillator 3 is provided so as to face the detection part P of the substrate 4.

  The circuit configuration of the radiographic imaging apparatus 1 will be described with reference to the block diagram shown in FIG. 3. A plurality of radiation detection elements 7 are two-dimensionally arranged on the substrate 4 to form a detection unit P. In addition, a bias line 9 is connected to the second electrode 7 b of each radiation detection element 7, and each bias line 9 is bound to a connection 10 and connected to a bias power supply 14. The bias power supply 14 applies a reverse bias voltage to the second electrode 7 b of each radiation detection element 7 via the connection 10 and each bias line 9.

  In the scanning drive means 15, an ON voltage or an OFF voltage is supplied from the power supply circuit 15a to the gate driver 15b via the wiring 15c, and the voltage applied to each line L1 to Lx of the scanning line 5 by the gate driver 15b is turned ON and OFF. Switching between the voltages and switching between the on state and the off state of each TFT 8 perform a process of reading image data from each radiation detection element 7 and the like.

  Each signal line 6 is connected to each readout circuit 17 formed in the readout IC 16, and the readout circuit 17 includes an amplifier circuit 18 and a correlated double sampling circuit 19. An analog multiplexer 21 and an A / D converter 20 are further provided in the reading IC 16.

  For example, in the process of reading the image data from each radiation detection element 7, the TFT 8 connected to the scanning line 5 to which the on voltage is applied from the gate driver 15b is turned on and turned on. Charge is discharged from the radiation detection element 7 connected to the TFT 8 to the signal line 6, and the discharged charge is converted into a charge voltage by the amplifier circuit 18 of the readout circuit 17.

  Then, the correlated double sampling circuit 19 provided on the output side of the amplifier circuit 18 calculates the difference between the output values from the amplifier circuit 18 before and after the charge is released from the radiation detection element 7, and the calculated difference is analog Output as value image data. Then, the output analog value image data is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21, and is converted into digital value image data by the A / D converter 20, and is output and stored. The data are sequentially stored in the means 23. In this way, the image data reading process from each radiation detection element 7 is sequentially performed.

  The control means 22 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface connected to the bus, an FPGA (Field Programmable Gate Array), or the like (not shown). It is configured. It may be configured by a dedicated control circuit. And the control means 22 controls operation | movement etc. of each member of the radiographic imaging apparatus 1.

  The control means 22 is connected to a storage means 23 composed of a DRAM (Dynamic RAM) or the like. In the present embodiment, the control unit 22 is connected to the antenna device 41 described above, and is further connected to the power switch 37, the changeover switch 38, the connector 39, the indicator 40 (see FIG. 1), and the like. ing.

  In the present embodiment, the control means 22 is connected to a built-in power supply 24 for supplying power to each member such as the control means 22, the scanning drive means 15, the readout circuit 17, the storage means 23, and the bias power supply 14. ing. In this embodiment, a lithium ion capacitor (LIC) is used as the built-in power supply 24. However, the present invention is not limited to this, and an electric storage device such as an electric double layer capacitor or the like can be used as long as it is a rechargeable built-in power supply. A normal battery or a secondary battery may be used.

  Although not shown in FIG. 3, in this embodiment, the built-in power supply 24 is connected to a charge control circuit 80 (see FIG. 8 to be described later) that controls charging of the built-in power supply 24. This point will be described in detail later.

[Configuration example of cradle as an example of charging device]
Next, a configuration example of the cradle 60 will be briefly described as an example of the charging device. 4 is a perspective view showing an external appearance of the cradle 60, and FIG. 5 is a perspective view showing a state in which the radiation image capturing apparatus 1 is inserted into the cradle 60 shown in FIG. 6 and 7 are diagrams schematically showing the internal configuration of the cradle 60. FIG. 6 shows a state in which the radiographic imaging apparatus 1 is to be inserted into the cradle 60, and FIG. 7 shows the cradle. 60 shows a state in which the radiation image capturing apparatus 1 is inserted.

  As shown in FIGS. 4 and 5, the cradle 60 includes a casing 61 that is formed in a substantially rectangular parallelepiped shape and has an opening 61 a on the upper surface, and a covering member 62 that covers the opening 61 a of the casing 61. . Various switches 63 for operating the cradle 60 are provided at one end of the housing 61.

  As shown in FIGS. 6 and 7, the housing 61 is provided with a device housing portion 64 that extends in the longitudinal direction of the housing 61 and houses the radiographic imaging device 1 in the vertical direction. The casing 61 houses various electronic components 66 arranged on the substrate 65. The electronic component 66 is, for example, an AC / DC that converts an AC voltage supplied from an external AC power source into a DC voltage in order to supply a constant DC voltage to the charge control circuit 80 of the radiographic imaging apparatus 1 to be described later. A constant voltage power supply 66a (see FIG. 8 described later) including a converter and the like is included.

  The device accommodating portion 64 includes a front side wall member 67 and a rear side wall member 68 that constitute the side wall of the device accommodating portion 64, and radiation is generated by the upper end portion of the front side wall member 67 and the upper end portion of the rear side wall member 68. An insertion port 69 (see FIG. 6) into which the image photographing apparatus 1 is inserted is formed. The radiographic image capturing apparatus 1 is inserted between the front side wall member 67 and the back side wall member 68 from the insertion port 69.

  A guide member 67 a that guides the radiographic imaging device 1 into the apparatus housing portion 64 is attached to the inner side of the front side wall member 67, and a buffer member 68 a is disposed on the inner side surface of the rear side wall member 68 in the longitudinal direction. It is provided over the entire surface.

  The device housing portion 64 has an inner dimension in the thickness direction that matches the outer dimension in the thickness direction of the radiation imaging apparatus 1. An apparatus holding means 70 for temporarily holding the radiographic imaging apparatus 1 inserted from the insertion opening 69 is disposed near the insertion opening 69 in the apparatus housing portion 64.

  A connector 71 on the cradle 60 side that can be connected to the connector 39 on the radiographic imaging device 1 side is disposed on the bottom of the device housing 64. The connector 71 on the cradle 60 side is electrically connected to the electronic component 66 described above via a cable (not shown).

  In the present embodiment, as shown in FIG. 6, when the radiographic image capturing apparatus 1 is inserted into the cradle 60 obliquely, the lid member 72 that is pushed by the radiographic image capturing apparatus 1 and covers the insertion port 69 is a covering member. Retreat to the back side (left side in the figure) along 62.

  When the radiographic imaging device 1 oriented in the substantially vertical direction is inserted from the insertion port 69, the lid member 2B on the side where the connector 39 of the radiographic imaging device 1 is provided once contacts the device holding means 70. Then, as shown in FIG. 7, the apparatus holding means 70 is rotated downward so that the radiographic image capturing apparatus 1 is accommodated in the apparatus accommodating portion 64.

  As described above, since the inner dimension in the thickness direction of the device accommodating portion 64 is a dimension that matches the outer dimension in the thickness direction of the radiographic image capturing apparatus 1, the radiographic image accommodated in the apparatus accommodating portion 64. The connector 39 on the photographing apparatus 1 side is automatically connected in a state where it is appropriately positioned at a position where it can be connected to the connector 71 on the cradle side.

[Configuration of charging control circuit]
Next, in the present embodiment, the configuration of the charging control circuit 80 provided on the radiation image capturing apparatus 1 side will be described. FIG. 8 is a block diagram schematically showing the circuit configuration of the charging control circuit 80.

  As shown in FIG. 8, in the present embodiment, the charging control circuit 80 mainly uses the power supplied from the constant voltage power supply 66 a of the cradle 60 via the connected connectors 39 and 71 of the radiographic imaging device 1. A charging current path 81 as wiring to be supplied to the built-in power supply 24 and a charge control unit 82 that controls charging to the built-in power supply 24 are provided.

  The charging control unit 82 includes at least a charging voltage detection unit 83, a charging current detection unit 84, a switching control unit 85, and a charging current switching unit 86.

  A first switch element 87a is provided on the charging current path 81, and a second switch element 87b is provided on the wiring 88 branched from the charging current path 81 and connected to the ground terminal. 87a and the second switch element 87b are connected to the switching control unit 85, respectively. In the present embodiment, the first switch element 87a and the second switch element 87b are each configured by a field effect transistor (FET), and the switching control unit 85 controls their on / off operation. It has become.

  A coil 89 is inserted into the charging current path 81, and a capacitor 90 is provided between the charging current path 81 and the ground terminal. The voltage of the charging current path 81 and the current flowing in the charging current path 81 are fluctuated by turning on / off the first switch element 87a and the second switch element 87b by the switching control unit 85, but the coil 89 has its inductance. Therefore, the capacitor 90 functions as a low-pass filter and smoothes those fluctuations.

  On the other hand, a resistor 91 for current detection is inserted in the charging current path 81, and the resistor 91 for current detection is formed by connecting a plurality of resistors 91a and 91b in parallel. Here, a case will be described in which two resistors 91a and 91b are connected in parallel to form the current detection resistor 91. However, the current detection resistor 91 is connected to a larger number of resistors in parallel. It is also possible to connect it to the substrate, and this point will be described later.

  Of the two resistors 91a and 91b constituting the current detecting resistor 91, a switch means 92 is connected to one resistor 91b. In the present embodiment, the switch means 92 is formed of an FET, and the on / off operation is controlled by the charging current switching unit 86.

  In addition, the current detecting resistor 91 is connected to the charging current detector 84 at both electrodes, and the charging current detector 84 detects a potential difference between the two electrodes of the current detecting resistor 91. ing.

  The charging current path 81 is connected to one charging terminal of the built-in power supply 24 of the radiation imaging apparatus 1, and the other charging terminal of the built-in power supply 24 is connected to the ground terminal of the charging control circuit 80. In the charging control circuit 80, the charging current path 81 and the ground terminal are connected via two resistors 93a and 93b, and the wiring 94 connected between the two resistors 93a and 93b detects the charging voltage. Connected to the unit 83. The charging voltage detection unit 83 detects the charging voltage charged in the built-in power supply 24 of the radiation image capturing apparatus 1.

[Charging control of built-in power supply in charge control circuit]
Hereinafter, charging control and the like of the built-in power supply 24 of the radiographic imaging apparatus 1 in the charging control circuit 80 will be described. At the same time, the radiographic imaging device 1 (electronic device), the cradle 60 (charging device) and the charging control circuit 80 according to the present embodiment, and the charging system 100 including them (see FIGS. 8 and 5). ) Will be described.

  As shown in FIG. 8, the switching control unit 85 of the charging control unit 82 includes information on the charging voltage charged by the built-in power supply 24 detected by the charging voltage detection unit 83 and detected by the charging current detection unit 84. Information on the potential difference between the two poles of the current detecting resistor 91 is fed back.

  Then, the switching control unit 85 controls the on / off operation of the first switch element 87a and the second switch element 87b according to the information, and is supplied from the constant voltage power supply 66a of the cradle 60 that is a charging device. The supply of electric power to the built-in power supply 24 is controlled.

  In the present embodiment, the switching control unit 85 is configured to switch the charging method for the built-in power supply 24 to constant voltage charging after performing constant current charging.

  Further, in the present embodiment, the charging current switching unit 86 of the charging control unit 82 turns on the switch means 92 during constant current charging and supplies both of the plurality of resistors 91a and 91b constituting the current detecting resistor unit 91. In the constant voltage charging, the switch means 92 is turned off, and one of the resistors 91a and 91b is cut off from the charging current path 81.

Specifically, as shown in FIG. 9, the switching control unit 85 has a target in which the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 (see the right scale and broken line in FIG. 9) is set. is smaller than the voltage V 0 is the constant current charging.

  In the present embodiment, the switching control unit 85 is configured to flow a relatively large constant current I such as 10 [A] through the charging current path 81 when performing constant current charging. The potential difference Δv between the two electrodes of the current detecting resistor 91 (that is, the plurality of resistors 91a and 91b connected in parallel in this case) detected by the detector 84 is set to a set current value (ie, for example, 10 [A ] To control the on / off operation of the first switch element 87a and the second switch element 87b.

  In this case, for example, when a resistor having a resistance value of 100 [mΩ] is used as the resistor 91a and a resistor having a resistance value of 10 [mΩ] is used as the resistor 91b, when they are connected in parallel, their combined resistance, that is, current The resistance of the entire detection resistor 91 is about 9.09 [mΩ]. Therefore, in this case, the potential difference Δv between both electrodes of the current detecting resistor 91 detected by the charging current detector 84 is 10 [A] × 9.09 [mΩ] = 90.9 [mV]. If controlled, a current I of approximately 10 [A] flows through the charging current path 81.

  Therefore, the switching control unit 85 has a potential difference Δvst (90.9 [mV] in the above example) between the two poles of the current detecting resistor 91 that is used as a reference in constant current charging. .) Is preset. Then, in the case of constant current charging, the switching control unit 85 uses the first switch element 87a and the second switching element 87a so that the potential difference Δv between both electrodes of the current detecting resistor 91 becomes the set reference potential difference Δvst. The on / off operation of the switch element 87b is controlled so that a constant current I such as 10 [A] flows through the charging current path 81.

  As described above, in the present embodiment, at the time of constant current charging, a relatively large current I such as 10 [A] is caused to flow through the charging current path 81. The charging time during constant current charging can be shortened as compared with the conventional charging method in which charging is performed with a relatively small current I flowing.

  Further, in the present embodiment, during constant current charging, both the plurality of resistors 91a and 91b connected in parallel are energized, so that the resistance value of the current detection resistor unit 91 as a whole is, for example, about It becomes 9.09 [mΩ]. On the other hand, when only the resistor 91a having a resistance value of, for example, 100 [mΩ] is used as the current detection resistor portion 91 as in the conventional charge control circuit, the resistance value of the current detection resistor portion 91 as a whole is used. Becomes 100 [mΩ].

  As described above, in the present embodiment, by energizing both of the plurality of resistors 91a and 91b connected in parallel, the resistance value of the current detecting resistor 91 as a whole is 1 as in the conventional charge control circuit. Therefore, even when the same 10 [A] constant current charging is performed, the power loss in the current detection resistor unit 91 can be further reduced as compared with the conventional case. It becomes possible.

On the other hand, in the present embodiment, constant current charging is performed in this manner, and when the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches the target voltage V 0 , the switching control unit 85 As shown, the charging method for the built-in power supply 24 is switched to constant voltage charging.

  At this time, in this embodiment, the information on the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 is also input to the charging current switching unit 86 (see FIG. 8) of the charging control unit 82. ing.

Then, when the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 reaches the target voltage V 0 (that is, in the present embodiment, the charging method is switched to constant voltage charging). The switch means 92 is turned off, and one of the resistors 91 a and 91 b constituting the current detecting resistor 91 is cut off from the charging current path 81.

  When one of the resistors 91b is cut off from the charging current path 81 in this way, only the resistor 91a is inserted into the charging current path 81 in the current detecting resistance section 91. In the above example, The resistance value of the current detecting resistor 91 as a whole is 100 [mΩ], which is the same as the resistance value of the resistor 91a.

  Then, the switching control unit 85 sets the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detecting unit 84 in a state where the charging current switching unit 86 blocks the one resistor 91b from the charging current path 81. Monitoring is performed to determine whether or not to terminate the constant voltage charging.

As described above, even if the constant current charging is performed and the charging voltage V of the built-in power source 24 detected by the charging voltage detector 83 reaches the target voltage V 0 , the resistance inside the built-in power source 24 and the charging current path 81 and the like since the voltage drop due to the presence, the charging voltage V of the internal power supply 24 is not actually reach the target voltage V 0.

Therefore, the switching control unit 85, the constant voltage charging after switching the way of charging, a target voltage V 0 charging voltage V does not exceed the target voltage V 0 which internal power supply 24 for detecting the charging voltage detector 83 The on / off operation of the first switch element 87a and the second switch element 87b is controlled so as to be maintained, and power is supplied to the built-in power supply 24 via the charging current path 81 to perform constant voltage charging. .

In this case, as described above, when charging is performed until the actual charging voltage of the built-in power supply 24 reaches the target voltage V 0 , that is, the current I does not flow in the charging current path 81, the current detecting resistor 91. If charging is performed until the potential difference Δv between the two electrodes becomes substantially 0 [V], the charging time of the built-in power supply 24 becomes very long.

  Therefore, in this embodiment, the switching control unit 85 switches the charging method to constant voltage charging, and then the potential difference Δv between the two poles of the current detection resistor unit 91 detected by the charging current detection unit 84 is, for example, in advance Charging by turning off the first switch element 87a when the potential difference Δvth or less corresponding to the current value set to a small value such as 0.1 [A] (see time t1 in FIG. 9) is set. The supply of power from the cradle 60 as an apparatus is stopped.

  In this way, the switching control unit 85 causes the built-in power supply 24 to turn off when the potential difference Δv between the two poles of the current detection resistor 91 detected by the charging current detection unit 84 becomes equal to or less than the preset threshold value Δvth. Charging is terminated.

  When configured as in the present embodiment, the following excellent effects can be achieved.

  In the conventional charge control circuit, one resistor is usually used as the current detecting resistor 91 (see, for example, the above-mentioned patent documents). Now, suppose that the resistance value of this resistor is 100 [mΩ], which is the same resistance value as the resistance value of the resistor 91a.

  Then, as described above, when the current I of 10 [A] is passed through the charging current path 81 during constant current charging, the charging current detection unit 84 (see FIG. 8) feeds back to the switching control unit 85. The value of the potential difference Δv between the two poles of the current detecting resistor 91 is 10 [A] × 100 [mΩ] = 1000 [mV] (= 1 [V]). That is, in the conventional charge control circuit, the above-described reference potential difference Δvst is 1000 [mV].

  For this reason, the switching control unit 85 of the conventional charge control circuit, during constant current charging, uses the reference potential difference Δvst as the value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detection unit 84. Monitoring is performed with a scale of potential difference Δv in the range of, for example, 0 to 1200 [mV] including 1000 [mV], and the current I flowing through the charging current path 81 is controlled to be a constant current of 10 [A]. .

  On the other hand, after the charging method is switched to the constant voltage charging, the switching control unit 85 monitors whether or not the current I flowing through the charging current path 81 becomes 0.1 [A], for example. In the conventional charge control circuit, the resistance value of the current detection resistor unit 91 is 100 [mΩ]. Therefore, the switching control unit 85 of the conventional charge control circuit is connected between both electrodes of the current detection resistor unit 91. It is determined whether or not the value of the potential difference Δv is 0.1 [A] × 100 [mΩ] = 10 [mV].

  That is, the switching control unit 85 of the conventional charging control circuit sets the value of the potential difference Δv between the two electrodes of the current detection resistor unit 91 detected by the charging current detection unit 84 during constant voltage charging to 0 during constant current charging. While monitoring on the scale of the potential difference Δv in the range of ˜1200 [mV], it is determined whether or not the value of the potential difference Δv has reached 10 [mV].

  Therefore, in the conventional charge control circuit, it is necessary to determine whether or not the potential difference Δv has become a very small value of 10 [mV] using a wide range scale of the potential difference Δv of 0 to 1200 [mV]. Disappear. As described above, in the conventional charge control circuit, particularly in the process of determining the end of charging at the time of constant voltage charging, the accuracy of determination with respect to the potential difference Δv between the two poles of the current detecting resistor 91 is reduced, and the control accuracy is reduced. Will become rough.

  On the other hand, in the charge control circuit 80 according to the present embodiment, at the time of constant current charging, the charging current switching unit 86 turns on the switch unit 92 and a plurality of units connected in parallel constituting the resistance unit 91 for current detection. Both of the resistors 91a and 91b are energized. Therefore, the resistance value of the current detection resistor unit 91 as a whole decreases. For example, when the resistance value of the resistor 91a is 100 [mΩ] and the resistance value of the resistor 91b is 10 [mΩ], the resistor unit 91 for current detection is used. The overall resistance value is reduced to about 9.09 [mΩ].

  When the current I of 10 [A] is made to flow through the charging current path 81, the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85. Is 10 [A] × 9.09 [mΩ] = 90.9 [mV]. That is, in the present embodiment, the above-described reference potential difference Δvst is 90.9 [mV].

  Therefore, the switching control unit 85 according to the present embodiment sets the value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detection unit 84 at the time of constant current charging as the reference potential difference Δvst. .9 [mV] including, for example, the scale of the potential difference Δv in the range of 0 to 200 [mV]. Then, in order to make the current I flowing through the charging current path 81 become a constant current of 10 [A], the value of the potential difference Δv between the two electrodes of the current detecting resistor 91 detected by the charging current detector 84. Is controlled to 90.9 [mV] which is the reference potential difference Δvst.

  On the other hand, after the charging method is switched to the constant voltage charging, the switching control unit 85 monitors whether or not the current I flowing through the charging current path 81 becomes 0.1 [A], for example. In the present embodiment, when the charging method is switched to constant voltage charging, the charging current switching unit 86 (see FIG. 8) of the charging control unit 82 turns off the switch means 92 to connect the resistor 91b from the charging current path 81. In order to cut off, the resistance value of the current detection resistor unit 91 as a whole is 100 [mΩ], which is the resistance value of the resistor 91a.

  Therefore, the switching control unit 85 according to the present embodiment determines whether or not the value of the potential difference Δv between both electrodes of the current detection resistor unit 91 is 0.1 [A] × 100 [mΩ] = 10 [mV]. Will be judged.

  That is, in the present embodiment, the switching control unit 85 of the charging control circuit 80 determines the value of the potential difference Δv between the two poles of the current detection resistor unit 91 detected by the charging current detection unit 84 during constant voltage charging. While monitoring on the scale of the potential difference Δv in the range of 0 to 200 [mV] at the time of charging, it is determined whether or not the value of the potential difference Δv has reached 10 [mV].

  Therefore, in the charge control circuit 80 according to the present embodiment, it is determined whether or not the potential difference Δv is 10 [mV] using the scale of the potential difference Δv in the range of 0 to 200 [mV]. Then, if a potential difference Δv of 10 [mV] is measured using a scale of 0 to 200 [mV], the measurement can be performed with sufficient accuracy, and whether or not the value of the potential difference Δv has reached 10 [mV]. Can be determined with sufficient accuracy.

  At least as compared with the case of determining whether or not the potential difference Δv has reached 10 [mV] using the scale of the potential difference Δv in the range of 0 to 1200 [mV] as in the conventional charge control circuit described above. It is possible to make a judgment with high accuracy.

  Therefore, when the charge control circuit 80 according to the present embodiment is used, as in the conventional charge control circuit described above, the determination accuracy for the potential difference Δv between the two poles of the current detection resistor portion 91 particularly during constant voltage charging. And the control accuracy becomes rough, and even when a small current I flows through the charging current path 81 during constant voltage charging, a current detecting resistor 91 corresponding to the current I flowing through the charging current path 81 is obtained. It is possible to detect a small value of the potential difference Δv between the two electrodes with high accuracy, and to perform current detection in constant voltage charging with high accuracy.

  In addition, during constant current charging, a large current I such as 10 [A] can be passed through the charging current path 81 in order to reduce the resistance value of the current detecting resistor 91 as a whole. It is possible to increase the current at the time. In addition, at the time of constant current charging, in order to lower the resistance value of the current detection resistor unit 91 as a whole, the power loss in the current detection resistor unit 91 is further reduced as described above. Is possible.

  As described above, according to the charging system 100 according to the present embodiment and the radiographic image capturing apparatus 1 (that is, the electronic apparatus) including the charging control circuit 80, in the constant current charging in which the large current I flows through the charging current path 81. The charging current detection unit of the charging control circuit 80 is configured to energize both of the resistors 91a and 91b constituting the current detection resistor unit 91 to lower the resistance value of the current detection resistor unit 91 as a whole. The value of the potential difference Δv between both poles of the current detecting resistor 91 fed back from 84 to the switching controller 85 is reduced.

  On the other hand, during constant voltage charging in which a small current I flows through the charging current path 81, some of the plurality of resistors 91a and 91b constituting the current detecting resistor 91 energized during constant current charging. By blocking the resistor 91b from the charging current path 81 and increasing the resistance value of the current detecting resistor unit 91 as a whole, between the two electrodes of the current detecting resistor unit 91 fed back from the charging current detecting unit 84 to the switching control unit 85 The potential difference Δv is increased.

  Therefore, using the scale of the range of the potential difference Δv used during constant current charging, the value of the potential difference Δv between the two poles of the current detecting resistor 91 during constant voltage charging for detecting a small current value can be accurately detected. Thus, it is possible to accurately determine whether or not to end constant voltage charging.

  Therefore, unlike the conventional charge control circuit, it is possible to prevent the accuracy of the determination from being lowered and the accuracy of the control from becoming rough due to the decrease in the potential difference Δv between the two electrodes of the current detecting resistor 91 particularly during constant voltage charging, Current detection in constant voltage charging can be performed with high accuracy, and not only constant current charging but also constant voltage charging can be performed accurately.

  In addition, during constant current charging, a large current I such as 10 [A] can be passed through the charging current path 81 in order to reduce the resistance value of the current detecting resistor 91 as a whole. It is possible to increase the current at the time and shorten the charging time. In addition, at the time of constant current charging, in order to lower the resistance value of the current detection resistor unit 91 as a whole, the power loss in the current detection resistor unit 91 is further reduced as described above. Is possible.

  As in the present embodiment, the switching control unit 85 switches the charging method from constant current charging to constant voltage charging, and at the same time, the charging current switching unit 86 disconnects the resistor 91b from the charging current path 81 to detect current. When the resistance value of the entire resistance portion 91 is increased to, for example, 100 [mΩ], as shown in FIG. 9, a current I of about 10 [A] is applied to the charging current path 81 at the moment when the charging method is switched. Flowing.

  Therefore, the value of the potential difference Δv between the two electrodes of the current detecting resistor 91 detected by the charging current detector 84 is 10 [A] × 9.09 [mΩ] = 90.9 [mV] during constant current charging. 10 [A] × 100 [mΩ] = 1000 [mV], and the range is given to the switching control unit 85 that monitors the potential difference Δv using a scale in the range of 0 to 200 [mV]. A state in which the value of the potential difference Δv that greatly exceeds is input from the charging current detector 84.

  This state is not necessarily a preferable state. Therefore, in order to prevent the occurrence of this state, for example, the charging current switching unit 86 is configured so that the charging current detecting unit 84 is switched after the switching control unit 85 switches the charging method from constant current charging to constant voltage charging. When the value of the detected potential difference Δv between the two poles of the resistance portion 91 decreases to a preset value, some of the plurality of resistors 91 a and 91 b are disconnected from the charging current path 81. It can be configured to do so.

  That is, for example, after the charging method is switched to constant voltage charging, the charging current switching unit 86 has a value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detecting unit 84, for example, When the voltage drops to 20 [mV], the resistor 91b is cut off from the charging current path 81.

  With this configuration, the value of the potential difference Δv input to the switching control unit 85 is 20 [mV] to 220 [mV] (≈100 [mΩ] × at the moment when the resistor 91 b is disconnected from the charging current path 81. 20 [mV] /9.09 [mΩ]), for example, the switching control unit 85 that monitors the potential difference Δv using a scale in the range of 0 to 200 [mV] has the range. Thus, a potential difference Δ that slightly exceeds is input. Then, the value of the current I flowing through the charging current path 81 immediately becomes 2 [A] or less, and the potential difference Δv between both poles of the current detecting resistor 91 immediately becomes 200 [mV] or less.

  Therefore, as described above, after the switching control unit 85 switches the charging method from constant current charging to constant voltage charging, the value of the potential difference Δv detected by the charging current detection unit 84 is a preset value (for example, 20 At the time when the voltage drops to [mV]), at least the switching controller 85 is set for the switching controller 85 by configuring a part of the plurality of resistors 91a and 91b to be cut off from the charging current path 81. It is possible to prevent the value of the potential difference Δv exceeding the scale of the potential difference Δv from being input to the switching control unit 85.

[Second Embodiment]
In the first embodiment, the accuracy of the determination about the potential difference Δv between the two electrodes of the current detecting resistor 91 particularly during the constant voltage charging is improved, so that the current detection in the constant voltage charging and the charging end determination are performed. The control configuration and the like that place importance on high precision have been described.

  On the other hand, in the research of the present inventors, by applying the above control configuration and the like, the charging efficiency in the charging method of the present invention in which constant current charging and constant voltage charging are performed is further improved, and constant current charging and It was possible to find a configuration that enables accurate constant voltage charging. In the present embodiment, a control configuration in consideration of this point will be described.

As described above, even when the constant current charging is performed and the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 (see FIG. 8) reaches the target voltage V 0 (see FIG. 9), the built-in power supply 24 since the voltage drop due to the internal and the charge control circuit 80 resistance in the like exist, the charging voltage V of the internal power supply 24 is not actually reach the target voltage V 0.

Then, when a large current I such as 10 [A] is caused to flow through the charging current path 81 during constant current charging as in the present invention, the above-described internal resistance depends on the above-described magnitude. The voltage drop may be large. In such a case, if the charging is stopped when the charging voltage V of the built-in power supply 24 reaches the target voltage V 0 , for example, as shown in FIG. there is a case where the value of the charging voltage V is relatively large decreases from the target voltage V 0.

Therefore, in such a case, when the charging voltage V of the built-in power supply 24 reaches the target voltage V 0 , the constant current charging is performed so that a smaller current I flows through the charging current path 81 again. be able to. In the present embodiment, a case where the charge control circuit 80 is configured to control the manner of charging in this way will be described.

  In the present embodiment, the configuration of the radiographic imaging device 1 as an example of an electronic device (see FIGS. 1 to 3), the configuration of a cradle 60 as an example of a charging device (see FIGS. 4 to 7), etc. This is the same as the case of the embodiment.

  The configuration of the charging control circuit 80 is the same as that of the first embodiment (see FIG. 8), but the resistance values of the plurality of resistors 91a and 91b constituting the current detecting resistor unit 91 are respectively the first. In this embodiment, the resistance values of the resistors 91a and 91b are each set to 100 [mΩ], for example.

  In the present embodiment, the charging current switching unit 86 of the charging control circuit 80 turns on the switch means 92 in the initial stage of constant current charging, and the current detecting resistor 91 is replaced with a plurality of resistors 91a. , 91b are connected in parallel. When a value of the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches a preset first target voltage, a part of the resistors 91b among the plurality of resistors 91a and 91b is charged. The current path 81 is cut off.

  In addition, after the charging current switching unit 86 cuts off the resistor 91b from the charging current path 81, the switching control unit 85 increases the value of the charging voltage V detected by the charging voltage detection unit 83 again and sets the preset first voltage. 2 When the target voltage is reached, the charging method is switched from constant current charging to constant voltage charging.

  Specifically, also in the present embodiment, at the initial stage of constant current charging, a plurality of resistors 91 a and 91 b having a resistance value of 100 [mΩ] are connected in parallel in the current detection resistor unit 91. Therefore, the resistance value of the current detecting resistor 91 as a whole is 50 [mΩ].

  If a current I of 10 [A] is passed through the charging current path 81 in this state, the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85 is obtained. Since the value is 10 [A] × 50 [mΩ] = 500 [mV], in this case, the above-described reference potential difference Δvst is 500 [mV].

  The switching control unit 85 monitors the value of the potential difference Δv between the two electrodes of the current detection resistor unit 91 detected by the charging current detection unit 84 and flows through the charging current path 81 in the initial stage of constant current charging. Control is performed so that the current I becomes a constant current of 10 [A].

When the built-in power supply 24 (see FIG. 8) is charged in this way, as shown in FIG. 11, the value of the charge voltage V of the built-in power supply 24 detected by the charge voltage detector 83 is increased and preset. The first target voltage is reached. FIG. 11 shows a case where the first target voltage is set to the same value as the target voltage V 0 in the case of the first embodiment.

  At this time, the charging current switching unit 86 blocks a part of the resistors 91b among the plurality of resistors 91a and 91b from the charging current path 81. For this reason, the resistance value of the current detecting resistor 91 as a whole is 100 [mΩ], which is the same as the resistance value of the resistor 91a.

  However, since the reference potential difference Δvst set in the switching control unit 85 remains unchanged at 500 [mV], the switching control unit 85 determines that the value of the potential difference Δv between the two poles of the current detection resistor unit 91 is the reference potential difference. The on / off operations of the first switch element 87a and the second switch element 87b (see FIG. 8) are controlled so that Δvst is 500 [mV]. Therefore, the current I flowing through the charging current path 81 is reduced from 10 [A] until then to 500 [mV] / 100 [mΩ] = 5.0 [A].

  Then, since the current of 10 [A] is passed through the resistors in the built-in power supply 24 and the charge control circuit 80, the current is changed to 5.0 [A]. The amount of voltage boost caused by passing a current through a resistor inside the circuit 80 is halved.

Therefore, as shown in FIG. 11, the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches the first target voltage V 0 , and the charging current switching unit 86 blocks the resistor 91 b from the charging current path 81. When the value of the current I flowing through the charging current path 81 is switched from 10 [A] to 5.0 [A], the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 temporarily decreases.

  Further, since the current I flowing through the charging current path 81 decreases from 10 [A] to 5.0 [A], the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 once decreases and then increases again. The rate of time increase when doing this is small. That is, the slope of increase of the charging voltage V in the graph of FIG. 11 becomes gentle.

  Then, when the value of the charging voltage V detected by the charging voltage detection unit 83 rises again and reaches the preset second target voltage, the switching control unit 85 changes the charging method from constant current charging. The built-in power supply 24 is charged by switching to constant voltage charging.

Note that FIG. 11 shows the case where both the first target voltage and the second target voltage are set to the same voltage value V 0 , but as described in the first embodiment, the switching control unit 85 of the charge control circuit 80. However, when the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches the target voltage V 0 , the charging method for the built-in power supply 24 is automatically switched to constant voltage charging. If the first target voltage is set to V 0 , the charging method is automatically switched to constant voltage charging.

Therefore, in such a case, for example, it is also possible to set the first target voltage to a value lower than the second target voltage V 0. This also applies to the third embodiment described below.

  In this embodiment, in this way, a voltage drop that cannot be sufficiently charged in the built-in power supply 24 by constant current charging performed by flowing a large current I such as 10 [A] through the charging current path 81 is obtained as follows. The resistance value of the current detection resistor unit 91 as a whole is lowered to reduce the value of the current I flowing through the charging current path 81 to compensate for the constant current charging again.

  In the present embodiment, as described above, the switching control unit 85 of the charging control circuit 80 does not perform control based on the value of the current I flowing through the charging current path 81 in constant current charging. It has been noted that the control is performed so that the value of the potential difference Δv between both poles of the current detecting resistor 91 corresponding to the current I matches the reference potential difference Δvst.

  Then, during constant current charging, the charging current switching unit 86 energizes both the plurality of resistors 91 a and 91 b connected in parallel with the current detecting resistor 91, or the one resistor 91 b is connected to the charging current path 81. The switching control unit 85 is charged according to the resistance value of the entire current detection resistor unit 91 by changing the resistance value of the entire current detection resistor unit 91. It becomes possible to automatically change the current I flowing through the current path 81.

  Therefore, as described above, when the built-in power supply 24 is charged by supplying a large current I such as 10 [A] at the initial stage of constant current charging, the internal power supply 24 and the charge control circuit 80 are charged. Although the voltage drop due to the internal resistance increases, the voltage drop is further reduced by reducing the current I flowing through the charging current path 81 by varying the resistance value of the current detection resistor unit 91 at an appropriate timing. In this state, it is possible to perform charging to compensate for a large voltage drop when the current of 10 [A] is passed.

  As described above, in this embodiment, constant current charging can be performed more efficiently. In addition, as described above, since the shift to the constant voltage charging is performed in a state where the voltage drop in the constant current charging is smaller, the constant voltage charging can be efficiently performed. Therefore, if the control configuration of the charge control according to the present embodiment is adopted, the charging efficiency of the built-in power supply 24 can be further improved, and constant current charging and constant voltage charging can be performed accurately.

[Third Embodiment]
In the second embodiment, as described above, the control configuration and the like that can perform charging more efficiently at least in constant current charging have been described.

  However, in this case, at the initial stage of constant current charging, the resistors 91a and 91b (both 100 [mΩ]) constituting the current detecting resistor unit 91 are connected in parallel, The resistance value of the entire resistance portion 91 is 50 [mΩ].

  Therefore, when the current I of 10 [A] is made to flow through the charging current path 81, the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85. 10 [A] × 50 [mΩ] = 500 [mV], and the aforementioned reference potential difference Δvst becomes 500 [mV].

  Even when the resistance 91b is cut off and the value of the current I flowing through the charging current path 81 becomes 5.0 [A], the reference potential difference Δvst is not changed and remains 500 [mV]. Therefore, the scale of the potential difference Δv in the range of, for example, 0 to 600 [mV] including 500 [mV] that is the reference potential difference Δvst is set in the switching control unit 85.

  However, when the scale of the potential difference Δv in a relatively wide range is used as described above, in the case of the conventional charge control circuit described in the first embodiment (in this case, for example, the potential difference Δv in the range of 0 to 1200 [mV]). In the process of determining the end of charging particularly during constant voltage charging, the accuracy of the determination on the potential difference Δv between the two electrodes of the current detecting resistor 91 is reduced, and the control There is a possibility that the accuracy becomes coarse.

  Therefore, in the present embodiment, for example, as shown in FIG. 12, in order to be able to exhibit both the beneficial operational effects in the first embodiment and the beneficial operational effects in the second embodiment. A charge control circuit 80 having a different configuration is used.

  That is, in this embodiment, the configuration of the charging control circuit 80 is almost the same as that of the first embodiment and the second embodiment shown in FIG. 8, but as shown in FIG. The resistor section 91 is formed by connecting three resistors 91a, 91b, 91c in parallel, and switch means 92a, 92b are connected to the resistors 91b, 91c, respectively.

  The switch means 92a and 92b are connected to the charging current switching unit 86, respectively, and are configured such that the on / off operation is controlled by the charging current switching unit 86 separately. It differs from the case of the form and the second embodiment.

  In the charging control circuit 80 according to the present embodiment, in the initial stage of constant current charging, the charging current switching unit 86 configures the current detecting resistor unit 91 by turning on the switch units 92a and 92b. All of the resistors 91a, 91b, 91c connected in parallel are energized. For this reason, the resistance value of the current detecting resistor 91 as a whole decreases.

  For example, when the resistance value of the resistor 91a is 100 [mΩ] and the resistance values of the resistors 91b and 91c are 10 [mΩ], the resistance value of the current detection resistor unit 91 as a whole is about 4.76 [mΩ]. Drop to.

  When the current I of 10 [A] is made to flow through the charging current path 81, the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85. Is 10 [A] × 4.76 [mΩ] = 47.6 [mV]. That is, in the present embodiment, the above-described reference potential difference Δvst is 47.6 [mV].

  Therefore, the scale of the potential difference Δv in the range of, for example, 0 to 100 [mV] including 47.6 [mV], which is the reference potential difference Δvst, is set in the switching control unit 85 according to the present embodiment. The value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detector 84 is monitored on the scale of the potential difference Δv in the range of 0 to 100 [mV].

  Then, in order to make the current I flowing through the charging current path 81 become a constant current of 10 [A], the value of the potential difference Δv between the two electrodes of the current detecting resistor 91 detected by the charging current detector 84. However, the on / off operation of the first switch element 87a and the second switch element 87b (see FIG. 8) may be controlled so that the reference potential difference Δvst is 47.6 [mV].

  When the built-in power supply 24 (see FIG. 8) is charged in this way, the value of the charge voltage V of the built-in power supply 24 detected by the charge voltage detection unit 83 increases and reaches a preset first target voltage. In this embodiment, as in the second embodiment, at this time, the charging current switching unit 86 turns off the switch unit 92b and sets a part of the plurality of resistors 91a, 91b, 91c. The resistor 91c is cut off from the charging current path 81.

  Therefore, the resistance value of the current detection resistor unit 91 as a whole is a combined resistance of the resistor 91a (resistance value is 100 [mΩ]) and the resistor 91b (resistance value is 10 [mΩ]) connected in parallel. It becomes about 9.09 [mΩ].

  The switching controller 85 then determines that the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85 is the above-described reference potential difference Δvst of 47.6 [mV]. ], In order to control the on / off operation of the first switch element 87a and the second switch element 87b (see FIG. 8), the value of the current I flowing through the charging current path 81 is eventually from 10 [A]. It decreases to about 5.2 [A].

  Further, as in the case of the second embodiment shown in FIG. 11, also in this case, when the value of the current I flowing through the charging current path 81 decreases from 10 [A] to about 5.2 [A]. The value of the charging voltage V detected by the charging voltage detection unit 83 also decreases once.

  Therefore, as in the case of the second embodiment, the constant current charging is performed again in a state where a current I of about 5.2 [A] flows through the charging current path 81 thereafter. In the initial stage of charging, a voltage drop that could not be charged in the built-in power supply 24 by constant current charging performed by supplying a current I of, for example, 10 [A] to the charging current path 81, for example, is about 5.2 It can be compensated by constant current charging for supplying the current I of [A]. Therefore, it is possible to obtain the beneficial effects similar to those of the second embodiment.

On the other hand, constant current charging is performed again in a state where the value of the current I flowing through the charging current path 81 is lowered, and the value of the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 is increased and preset. Upon reaching the second target voltage V 0 was, as in the first embodiment, the switching control unit 85 switches the manner of charging the internal power supply 24 from the constant current charging to constant voltage charging.

  Then, the charging current switching unit 86 is connected between the two electrodes of the current detection resistor unit 91 when the charging method is switched to constant voltage charging or after the charging method is switched from constant current charging to constant voltage charging. When the value of the potential difference Δv decreases to a preset value, this time, the switch means 92a is turned off, and one of the resistors 91a and 91b constituting the current detecting resistor 91 at this time is selected. The resistor 91 b is cut off from the charging current path 81.

  Since the resistor 91c is already cut off from the charging current path 81, at this time, only the resistor 91a is connected to the resistor 91 for current detection. Therefore, the resistance value of the current detecting resistor 91 as a whole is 100 [mΩ], which is the resistance value of the resistor 91a.

  Therefore, the switching control unit 85 according to the present embodiment determines whether or not the value of the potential difference Δv between both electrodes of the current detection resistor unit 91 is 0.1 [A] × 100 [mΩ] = 10 [mV]. Will be judged.

  At that time, as in the case of the first embodiment, also in the present embodiment, the switching control unit 85 of the charge control circuit 80 has a range of 0 to 100 [mV] used during constant current charging during constant voltage charging. (As in the first embodiment, it may be in the range of 0 to 200 [mV].) On the scale of the potential difference Δv, the potential difference Δv between the two electrodes of the current detection resistor 91 detected by the charging current detector 84. Whether the value of the potential difference Δv has reached 10 [mV] is monitored.

  As described in the first embodiment, it is sufficiently accurate to determine whether or not the potential difference Δv becomes 10 [mV] using the scale of the potential difference Δv in the range of 0 to 100 [mV]. Since it can be performed well, at least as in the conventional charge control circuit shown in the first embodiment, the potential difference Δv is set to 10 [mV] using the scale of the potential difference Δv in the range of 0 to 1200 [mV]. Compared with the case of determining whether or not, it is possible to make a determination with much higher accuracy.

  Therefore, if the charging control circuit 80 according to the present embodiment is used, the current flowing through the charging current path 81 even when a small current I flows through the charging current path 81 during constant voltage charging, as in the case of the first embodiment. It is possible to detect a small value of the potential difference Δv between both poles of the current detecting resistor portion 91 corresponding to I with high accuracy, and to provide a beneficial operational effect such that current detection in constant voltage charging can be performed with high accuracy. Can be obtained.

  Moreover, if the charge control circuit 80 according to the present embodiment is used, the beneficial effects described in the second embodiment can be obtained as described above. Therefore, according to the charging system 200 (see FIG. 12) and the radiographic imaging apparatus 1 (that is, the electronic apparatus) including the charging control circuit 80 according to the present embodiment, the first embodiment and the second embodiment described above. The beneficial effects described in (1) and (2) can be accurately exhibited with, for example, the simple control configuration shown in FIG.

  In the first to third embodiments, the case where the charging control circuit 80 is provided in the radiographic imaging apparatus 1 that is an electronic device has been described. However, for example, as illustrated in FIG. 13 corresponding to FIG. It is also possible to constitute the control circuit 80 in the cradle 60 that is a charging device. In this case, for example, it is possible to provide the charge control circuit 80 in a portion where various electronic components 66 are housed on the substrate 65 inside the casing 61 (see FIG. 7 and the like) of the cradle 60.

  In the first to third embodiments, the two resistors 91 a and 91 b or the three resistors 91 a to 91 c are used as the current detecting resistor 91 inserted in the charging current path 81 of the charging control circuit 80. Although the case of using the current detection resistor 91 formed in parallel is described, it is configured that a plurality of resistors are connected in parallel to form the current detection resistor 91. Is also possible.

  Furthermore, in the first to third embodiments described above, the case where the electronic device is the radiographic imaging device 1 and the charging device is the cradle 69 is described. The present invention can be applied to a notebook personal computer, a mobile phone, a portable information terminal, and the like as long as they are built-in electronic devices. The present invention can also be applied to those charging devices.

1 Radiation imaging equipment (electronic equipment)
24 Built-in power supply 60 Cradle (charging device)
80 Charging Control Circuit 81 Charging Current Path 83 Charging Voltage Detection Unit 84 Charging Current Detection Unit 85 Switching Control Unit 86 Charging Current Switching Unit 91 Current Detection Resistance Units 91a to 91c Multiple Resistances 91b and 91c Some Resistances 100 and 200 Charging system V Charging voltage V 0 Target voltage Δv Potential difference

Claims (13)

  1. An electronic device with a built-in rechargeable power supply,
    The charging is performed by performing constant current charging so that the charging current is constant until the charging voltage charged in the built-in power source reaches the target voltage, and after the charging voltage reaches the target voltage. Is switched to constant voltage charging that performs charging so that the charging voltage is constant, and a charging control circuit that controls charging to the built-in power source of the electronic device;
    A charging device for supplying power to the built-in power source of the electronic device via the charging control circuit;
    With
    The charge control circuit includes:
    A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
    A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
    A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
    With
    The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
    The charging system is characterized in that the charging control circuit cuts off some of the plurality of resistors energized during constant current charging from the charging current path at least during constant voltage charging.
  2. The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
    The switching control unit changes the charging method from constant current charging to constant voltage charging when the charging voltage charged in the built-in power source detected by the charging voltage detection unit reaches a preset target voltage. Switch to
    The charging current switching unit is in a state in which the plurality of resistors of the current detecting resistor unit are connected in parallel at the time of constant current charging, and when the charging method is switched from constant current charging to constant voltage charging. The charging system according to claim 1, wherein a part of the plurality of resistors is cut off from the charging current path.
  3. The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
    The switching control unit changes the charging method from constant current charging to constant voltage charging when the charging voltage charged in the built-in power source detected by the charging voltage detection unit reaches a preset target voltage. Switch to
    The charging current switching unit is in a state where the plurality of resistors of the current detection resistor unit are connected in parallel at the time of constant current charging, and after the charging method is switched from constant current charging to constant voltage charging, The one of the plurality of resistors is cut off from the charging current path when the potential difference detected by the charging current detection unit is reduced to a preset value. The charging system described.
  4. An electronic device with a built-in rechargeable power supply,
    The charging is performed by performing constant current charging so that the charging current is constant until the charging voltage charged in the built-in power source reaches the target voltage, and after the charging voltage reaches the target voltage. Is switched to constant voltage charging that performs charging so that the charging voltage is constant, and a charging control circuit that controls charging to the built-in power source of the electronic device;
    A charging device for supplying power to the built-in power source of the electronic device via the charging control circuit;
    With
    The charge control circuit includes:
    A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
    A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
    A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
    With
    The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
    The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
    The charge current switching unit of the charge control circuit sets the resistance unit for current detection to a state in which the plurality of resistors are connected in parallel at an initial stage of constant current charging, and the charge voltage detection unit detects When the charging voltage charged in the built-in power source reaches a preset first target voltage, a part of the plurality of resistors is cut off from the charging current path,
    The switching control unit of the charge control circuit is configured such that the charge voltage detected by the charge voltage detection unit is detected after the charge current switching unit blocks a part of the plurality of resistors from the charge current path. A charging system, wherein the charging method is switched from constant current charging to constant voltage charging when reaching a preset second target voltage.
  5.   The charging system according to claim 1, wherein the charging control circuit is provided in the electronic device.
  6.   The charging system according to claim 1, wherein the charging control circuit is provided in the charging device.
  7.   The charging system according to any one of claims 1 to 6, wherein the built-in power source is a lithium ion capacitor.
  8.   The charging system according to any one of claims 1 to 7, wherein the electronic device is a radiographic imaging device.
  9.   The charging system according to any one of claims 1 to 8, wherein the charging device is a cradle.
  10. Built-in rechargeable built-in power supply, the charging method, constant current charging is performed so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, An electronic device comprising a charge control circuit for controlling charging to the built-in power source of the electronic device by switching to constant voltage charging for charging so that the charging voltage becomes constant after the charging voltage reaches the target voltage Equipment,
    The charge control circuit includes:
    A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
    A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
    A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
    With
    The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
    The electronic device characterized in that the charging control circuit cuts off a part of the plurality of resistors energized at the time of constant current charging from the charging current path at least during constant voltage charging.
  11. Built-in rechargeable built-in power supply, the charging method, constant current charging is performed so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, An electronic device comprising a charge control circuit for controlling charging to the built-in power source of the electronic device by switching to constant voltage charging for charging so that the charging voltage becomes constant after the charging voltage reaches the target voltage Equipment,
    The charge control circuit includes:
    A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
    A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
    A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
    With
    The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
    The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
    The charge current switching unit of the charge control circuit sets the resistance unit for current detection to a state in which the plurality of resistors are connected in parallel at an initial stage of constant current charging, and the charge voltage detection unit detects When the charging voltage charged in the built-in power source reaches a preset first target voltage, a part of the plurality of resistors is cut off from the charging current path,
    The switching control unit of the charge control circuit is configured such that the charge voltage detected by the charge voltage detection unit is detected after the charge current switching unit blocks a part of the plurality of resistors from the charge current path. An electronic apparatus characterized in that, when reaching a preset second target voltage, the charging method is switched from constant current charging to constant voltage charging.
  12. How to charge an electronic device with a built-in rechargeable power supply, performing constant current charging to charge so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, After the charging voltage reaches the target voltage, a charging control circuit is provided that switches to constant voltage charging that performs charging so that the charging voltage becomes constant and controls charging of the electronic device with the built-in power source. A charging device,
    The charge control circuit includes:
    A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
    A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
    A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
    With
    The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
    The charging control circuit cuts off some of the plurality of resistors energized during constant current charging from the charging current path at least during constant voltage charging.
  13. How to charge an electronic device with a built-in rechargeable power supply, performing constant current charging to charge so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, After the charging voltage reaches the target voltage, a charging control circuit is provided that switches to constant voltage charging that performs charging so that the charging voltage becomes constant and controls charging of the electronic device with the built-in power source. A charging device,
    The charge control circuit includes:
    A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
    A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
    A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
    With
    The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
    The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
    The charge current switching unit of the charge control circuit sets the resistance unit for current detection to a state in which the plurality of resistors are connected in parallel at an initial stage of constant current charging, and the charge voltage detection unit detects When the charging voltage charged in the built-in power source reaches a preset first target voltage, a part of the plurality of resistors is cut off from the charging current path,
    The switching control unit of the charge control circuit is configured such that the charge voltage detected by the charge voltage detection unit is detected after the charge current switching unit blocks a part of the plurality of resistors from the charge current path. A charging device that switches the charging method from constant current charging to constant voltage charging when a second target voltage set in advance is reached.
JP2011023544A 2011-02-07 2011-02-07 Charging system, electronic apparatus and charging apparatus Withdrawn JP2012165546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015064734A1 (en) * 2013-11-01 2015-05-07 日本電気株式会社 Charging device, electricity storage system, charging method, and program
JP2018525961A (en) * 2016-02-05 2018-09-06 広東欧珀移動通信有限公司 Terminal charging system, charging method and power adapter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015064734A1 (en) * 2013-11-01 2015-05-07 日本電気株式会社 Charging device, electricity storage system, charging method, and program
JPWO2015064734A1 (en) * 2013-11-01 2017-03-09 日本電気株式会社 Charging device, power storage system, charging method and program
JP2018525961A (en) * 2016-02-05 2018-09-06 広東欧珀移動通信有限公司 Terminal charging system, charging method and power adapter
US10320225B2 (en) 2016-02-05 2019-06-11 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Charging system and charging method for increasing service life of battery of terminal and power adapter thereof
US10491030B2 (en) 2016-02-05 2019-11-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Charging system and charging method for terminal and terminal

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