JP3950451B2 - Power supply - Google Patents

Description

  The present invention relates to a power supply device, and in particular, when power is supplied to a load device based on control information stored in an output cable, power having an output voltage necessary for the load device is accurately and efficiently supplied. The present invention relates to a power supply device that can be supplied.

  In recent years, users have frequently carried a plurality of electronic devices such as a mobile phone, a digital camera, a game machine, and a PDA. Therefore, how to charge and supply power to each electronic device has become important. For example, when a user goes on a trip, it is necessary to carry the charger and power supply device of each electronic device, but if the specifications of the charger and power supply device for each electronic device are different, the user Since it is necessary to carry a plurality of chargers and power supply devices, the carrying labor for the user becomes excessive.

  For this reason, a conventional technique is known in which a power supply adapter portion is shared and a voltage setting circuit is provided in an output cable so that a user can properly use the output cable to supply an appropriate voltage to a desired electronic device. Yes. For example, Patent Document 1 discloses a technique in which a voltage setting circuit formed of a dividing resistor or the like is provided on the output cable side, and an AC voltage obtained from an AC outlet is converted into a predetermined voltage after AC / DC conversion. Has been.

  As shown in FIG. 9, the voltage setting circuit as disclosed in Patent Document 1 is provided with a dividing resistor composed of R1 and R2 in the output cable, and a relationship of Vout = Vref × (1+ (R1 / R2)). The voltage is adjusted by feedback input to the negative terminal of the comparator while using the reference voltage, or a reference voltage source (zener diode) is provided in the output cable as shown in FIG. A method of adjusting the voltage on the power source body side while supplying the reference voltage from the power supply to the plus terminal of the comparator is conceivable.

JP 2002-374675 A

  However, regardless of which analog circuit is used, there is a problem in that the output voltage varies unless the output cable and the power supply body are uniquely determined due to the accuracy limit of the dividing resistor and the reference voltage source. Also, if control other than output voltage (current adjustment, etc.) is performed using an analog circuit, many circuit elements must be mounted in the output cable, resulting in an increase in the number of terminals and costs. This is not realistic because it causes an increase in size and enlargement of the shape.

  For this reason, in Patent Document 1, the voltage value of the digital signal is held in the ROM of the output cable instead of the analog circuit, and the output voltage value is read by reading the voltage value in the ROM of the output cable on the power supply main unit side. The point of setting is also mentioned. However, this Patent Document 1 only describes that the voltage value can be stored in the ROM of the output cable, and does not describe the specific configuration. Therefore, a digital / analog converter (DAC) is provided in the power supply unit, a digital signal having a voltage value read from the ROM is converted into an analog signal by the DAC, and the analog signal is compared with the comparator shown in FIG. 9 or FIG. It is guessed that it is input to.

  However, in such a case, there is a problem that it is impossible to cope with variations in output voltage due to variations in circuit characteristics of the power supply circuit. In addition, since the power supply unit does not operate properly unless the control format such as the length of the control bit string set in the DAC is accurate, the voltage value stored in the ROM depends on the circuit configuration of the power supply unit. There is also a problem that data in the ROM is restricted.

  Therefore, when supplying power to the load device based on the control information stored in the output cable, it is important how to accurately and efficiently supply power having the output voltage necessary for the load device. It is a difficult issue.

  This invention is made in view of the said subject (problem), and when supplying electric power to a load apparatus based on the control information memorize | stored in the output cable, electric power which has an output voltage etc. which are required for a load apparatus It is an object of the present invention to provide a power supply device that can accurately and efficiently supply power.

In order to solve the above-described problems, the present invention is a power supply device including a power supply main body that supplies power, a load device that consumes power, and an output cable that is mounted between the power supply main body, The output cable includes storage means for storing control information including an output voltage to be output to the load device, and the power source main body section includes power conversion means for converting power received from the outside, and storage in the output cable. Control means for controlling the power output from the power conversion means on the basis of circuit control data corresponding to the control information stored in the means and including information on variations in circuit characteristics included in the power conversion means. The control means includes a table in which a plurality of output voltages and circuit control data used for controlling the power conversion means are associated with each other; The circuit control data corresponding to the output voltage stored in the storage means extracts from said table, and controls the power converting means based on the extract out the circuit control data.

  Further, the present invention is the above invention, wherein the table stores a bit string having a predetermined number of bits as the circuit control data, and the power conversion means uses the analog data obtained by digital / analog conversion of the bit string as the target value. The output voltage of the power conversion means is feedback controlled.

  According to the present invention, in the above invention, control information including an output current output to the load device is stored, and the control means includes a plurality of output currents and circuit control data used when controlling the power conversion means, The circuit control data corresponding to the output current stored in the storage means in the output cable is extracted from the table, and the power conversion means is controlled based on the extracted circuit control data. It is characterized by.

  Further, according to the present invention, in the above invention, the storage unit stores control information including a maximum supply current to be output to the load device, and the control unit outputs the output current output from the power conversion unit and the maximum Supply power is compared, and when the output current is larger than the maximum supply current, the power conversion means is controlled so that the output current is equal to or less than the maximum supply current.

  Further, according to the present invention, in the above invention, the storage unit stores control information including a standby current and a standby time that are output when the load device is in a standby state, and the control unit has an output current that is output to the load device. Control is performed so as to stop the power supply to the load device when the situation where the current becomes equal to or less than the standby current continues for the standby time.

  Further, the present invention is the above invention, wherein the storage means stores user information for identifying a user of the load device, version information of the load device and / or manufacturer information for manufacturing the load device in the control information. Further stored as a part, the control means controls power supply to the load device via the output cable based on the user information, version information and / or manufacturer information.

  Further, the present invention is characterized in that, in the above invention, the storage means is a rewritable EPROM, and the control information stored in the storage means can be rewritten by the control means.

  Further, the present invention is characterized in that, in the above-mentioned invention, the control means sequentially stores an error report in a predetermined area of the storage means when an error occurs.

The power supply device according to the present invention stores control information including the output voltage output to the load device in the output cable, and provides a table in which a plurality of output voltages and circuit control data used for controlling power conversion are associated with each other. In addition , the circuit control data corresponding to the output voltage stored in the output cable and including information on the variation in circuit characteristics is extracted from the table, and the power conversion is controlled based on the extracted circuit control data. Therefore, when power is supplied to the load device based on the control information stored in the output cable, power having an output voltage or the like necessary for the load device can be supplied accurately and efficiently. In particular, the variation in characteristics of each circuit can be absorbed by a table, thereby increasing the accuracy of the output voltage stored in the output cable.

  In addition, the power supply device according to the present invention stores control information including output current output to the load device in the output cable, and associates a plurality of output currents with circuit control data used when controlling power conversion. The circuit control data corresponding to the output current stored in the output cable is extracted from the table, and the power conversion is controlled based on the extracted circuit control data. The accuracy of the output current absorbed in the output cable and stored in the output cable can be increased.

  The power supply device according to the present invention stores control information including the maximum supply current output to the load device, compares the output current output from the power conversion means with the maximum supply current, and outputs the maximum Since the power conversion unit is configured to control the output current to be equal to or less than the maximum supply current when the output current is larger than the supply current, the output current can be efficiently suppressed to the maximum supply current or less.

  The power supply device according to the present invention stores control information including standby current and standby time output when the load device is on standby, and the situation where the output current output to the load device is equal to or lower than the standby current is the standby time. Since the power supply to the load device is controlled to stop when the load device continues, the power supply to the load device is stopped when the load device shifts to standby processing or when the power is turned off. Thus, it is possible to effectively use power while suppressing overload of the load device.

  Further, the power supply device according to the present invention further stores user information for identifying a user of the load device, version information of the load device and / or manufacturer information for manufacturing the load device as part of the control information, Since the power supply to the load device via the output cable is controlled based on user information, version information and / or manufacturer information, when used by a legitimate user, if the version is correct, legitimate manufacture It can be controlled to supply power only if it is manufactured by a vendor.

  Further, the power supply device according to the present invention is configured such that control information is stored in a rewritable EPROM provided in the output cable, and this control information can be rewritten from the power supply main body, so that the power supply main body side The contents of the output cable and other information can be rewritten to facilitate smooth operation.

  In addition, since the power supply device according to the present invention is configured to sequentially store the error report in a predetermined area of the EPROM provided in the output cable when an error occurs, only the inspection of the output cable when an error occurs. The cause can be investigated, and the error handling can be speeded up and smoothed.

  Embodiments of a power supply apparatus according to the present invention will be described below in detail with reference to the drawings. Here, the case where the present invention is applied to a solar power supply apparatus that supplies electric power generated using a solar battery to various load devices is shown.

  FIG. 1 is a block diagram showing the overall configuration of a power supply device according to the present invention. The power supply device shown in FIG. 1 includes a power generation unit 10 and a main body unit 20 and supplies power to the load device 40 via the output cable 30. Here, the present invention stores the control information related to the power supplied to the load device 40 in the ROM 31 provided in the output cable 30, and the control information and the circuit control data used when controlling the power conversion unit 22. A table 23c that is stored in association is provided on the main body 20 side, and when the output cable 30 is connected to the main body 20, the control information is read from the ROM 31, and the circuit control data corresponding to the control information is stored in the table 23c. The power conversion unit 22 is configured to be controlled based on the acquired circuit control data. In the present embodiment, the case where the control information is stored as text data will be described. However, the control information can also be stored as binary data.

  The ROM 31 may be a rewritable EPROM such as a flash memory. Then, by enabling rewriting from the main body section 20, it is possible to rewrite the contents of the ROM 31 in the output cable 30 from the main body section 20, thereby achieving smooth operation. In particular, when an error occurs, the error report is sequentially stored in a predetermined area of the rewritable EPROM so that when the error occurs, the cause can be investigated only by inspecting the output cable 30. Can be speeded up and smoothed.

  The power generation unit 10 is a solar cell that receives sunlight to generate power, and supplies the generated power to the main body unit 20. The power generation unit 10 may be a fuel cell other than a solar cell or other power generator.

  The main body unit 20 temporarily stores the power received from the power generation unit 10 in the power storage unit 21, and the power stored in the power storage unit 21 based on control information (text data) stored in the ROM 31 of the output cable 30. The processing unit supplies power having an accurate voltage value suitable for the load device 40.

  The main body unit 20 includes a power storage unit 21, a power conversion unit 22, and a software control converter 23. The power storage unit 21 is a power storage element that temporarily stores the power received from the power generation unit 10, and the power conversion unit 22 is a processing unit that includes a switching regulator or a series regulator that converts the output power to a target value. is there. In the present embodiment, a case where a switching regulator is used as the power converter 22 is shown.

  The software control converter 23 is a processing unit that performs software control of power conversion by the power conversion unit 22 based on control information (text data) stored in the ROM 31 of the output cable 30. In the present embodiment, the software control converter 23 is realized by a microcomputer in which a CPU and a memory are connected by a bus as will be described later.

  The software control converter 23 includes a table 23c that stores control information (text data) and circuit control data used when controlling the power conversion unit 22 in association with each other. The reason why the table 23c is provided is to separate the problem of variation in circuit characteristics of the power supply circuit from the control information stored in the ROM 31 of the output cable 30. By using the table 23c, it becomes possible to store voltage target values and the like as text data in the ROM 31, and it is possible to perform efficient feedback control of voltage values and the like.

  The output cable 30 is a power supply cable used to connect the load device 40 and the main body 20, and has a ROM 31 in the connector on the main body 20 side. However, it can also be provided in another part other than the connector part. A bus and a power supply line to the ROM 31 are provided between the ROM 31 and the connection end on the main body 20 side. Thereby, when the output cable 30 is connected to the main body 20, the software control converter 23 of the main body 20 can read the data in the ROM 31. The output cable 30 is handled as a pair with the load device 40 in principle. However, when the same power control is performed by a plurality of load devices 40, one output cable 30 is connected to these load devices 40. You may make it correspond.

  The ROM 31 stores control information related to the power supplied to the load device 40 as text data such as “4.789v”. This control information includes output control data such as output voltage, maximum supply current, standby current, and standby time, and serial numbers such as vendor ID, version, and user ID.

  The load device 40 is an electronic device with power consumption, such as a mobile phone, a digital camera, a game machine, and a PDA, and receives a desired power supply from the main unit 20 via the output cable 30. In the present embodiment, the load device 40 has two states, an operating state and a standby state, and shifts from the operating state to the standby state when it is not operated for a predetermined time. When the load device 40 shifts to the standby state, the software control converter 23 detects that the load current has become equal to or less than the standby current set in the ROM 31, and controls to stop the power supply to the load device 40. Thus, useless power consumption can be prevented. Similarly, even when the load device 40 is turned off, useless power consumption can be prevented by detecting that the load current is equal to or less than the standby current set in the ROM 31 and stopping the power supply.

  Next, the configuration of the main body 20 shown in FIG. 1 will be described in more detail. FIG. 2 is a diagram illustrating a detailed configuration of the main body unit 20 illustrated in FIG. 1. In addition, although the electrical storage part 21 is provided in this main-body part 20 as already demonstrated, since it is not the characteristic part of this invention, description about the electrical storage part 21 is abbreviate | omitted here.

  As shown in FIG. 2, the main body 20 includes a switching regulator 22a, a comparator 22b, a dividing resistor 22c, a software control converter 23, a supply current detection current sensor 24, a power supply switch 25, And a ROM power supply unit 26.

  The switching regulator 22a is a processing unit that converts electric power supplied from the power storage unit 21 (not shown) according to the output of the comparator 22b. Although the switching regulator 22a is used here, a series regulator or the like can be used instead. The comparator 22b is a processing unit that compares the output value from the dividing resistor 22c with the output value from the DAC 23e of the software control converter 23 and outputs the difference to the switching regulator 22a.

  The software control converter 23 is a processing unit that outputs an appropriate control target value (analog value) to the negative terminal of the comparator 22b based on the control information stored in the ROM 31 in the output cable 30. Is done in software. The software control converter 23 can be formed as a so-called microcomputer, and includes a CPU 23a, a storage unit 23b for storing a table 23c, a ROM interface 23d, a digital / analog converter (DAC) 23e, and an analog / digital converter (ADC) 23f. The configuration is connected to the bus.

  When the output cable 30 is connected to the main unit 20, the software control converter 23 reads control information (text data) stored in the ROM via the ROM interface 23d and uses the table 23c to read the control information. The circuit control data corresponding to is acquired. Then, the acquired circuit control data is output to the DAC 23e, and a control target value is set to the plus terminal of the comparator 22b.

  Further, the software control converter 23 digitizes the detected current obtained by the supply current detection current sensor 24 with the ADC 23f, and the load device 40 is not turned off by the detected current value, or the load device It is determined whether 40 has not shifted to the standby state. When the power is cut off or in the standby state, an instruction is given to turn off the power supply switch 25 that supplies power.

  Here, the software control converter 23 does not simply output the control information read from the ROM 31 to the DAC 23e, but obtains circuit control data corresponding to the control information from the table 23c and outputs it to the DAC 23e. There are features. This is because the use of the table 23c prevents the influence of variations in circuit characteristics. In other words, if this table 23c is not provided as in the prior art, it is impossible to prevent variations in circuit characteristics, or circuit control data including variations in circuit characteristics must be written in the ROM 31. The problem that it is not right arises.

  The supply current detection current sensor 24 is a sensor that detects the amount of electric power output from the switching regulator 22 a and outputs the detection result to the ADC 23 f of the software control converter 23. The power supply switch 25 is a switch for switching on / off the power supply from the main body 20 to the output cable 30, and is controlled by the software control converter 23. The ROM power supply unit 26 is a power supply unit that supplies power to the ROM 31 when the output cable 30 is connected to the main body unit 20. The ADC 23f reads the generated output voltage, compares it with the control target value (which may be control information in the ROM 31 or circuit control data), and turns on the power supply switch 25 if within a predetermined error. Power supply to the load device 40 is started.

  Next, the control information stored in the ROM 31 shown in FIG. 1 and the table 23c will be described in more detail. 3 is a diagram showing an example of control information stored in the ROM 31 shown in FIGS. 1 and 2, and FIG. 4 is a diagram showing an example of data stored in the table 23c shown in FIGS. is there.

  As shown in FIG. 3, in the ROM 31 of the output cable 30, output control data such as output voltage, maximum supply current, standby current and standby time, and a serial number consisting of a vendor ID, version, user ID, etc. are texts. Stored as data. Here, the output voltage is “4.789v”, the maximum supply current is “1500 mA”, the standby current is “3 mA”, the standby time is “15 sec”, the vendor ID is “001”, the version is “v1.2”, the user The case where the ID is “123456” is shown.

  Here, the reason why the output voltage is stored in the ROM 31 is to supply power having an accurate and appropriate voltage value required by the load device 40. The reason for storing the data as text data is that the variation in circuit characteristics is eliminated on the software control converter 23 (table 23c) side of the main unit 20. In addition, by storing as text data, there is an advantage that the accuracy of the DAC provided in the software control converter 23 can be flexibly handled. Specifically, when an 8-bit DAC is mounted, if the output voltage resolution is a power supply of 0.1V, circuit control data corresponding to 4.8V is read and rounded to 4.78V. From the table 23c. When a 12-bit DAC is mounted, if it is a high-accuracy power source, it is sufficient to read up to 4.789 V and fetch circuit control data corresponding to this from the table 23c. Furthermore, when a power supply having a higher resolution than the output voltage in the ROM 31 is connected, it can be dealt with by interpolating data from 4.789 V to 4.78900 V.

  The reason why the maximum supply current is stored in the ROM 31 is to protect the load device 40. Specifically, the CPU 23a checks whether or not the current value detected by the supply current detection current sensor 24 is equal to or greater than the maximum supply current 1500 mA, and if it is equal to or greater than the maximum supply current 1500 mA, the power supply switch 25 Will be instructed to turn off.

  The reason why the standby current and the standby time are stored in the ROM 31 is to protect the load device 40 and to effectively use the power when the load device 40 supplies excessive power when the load device 40 is in the standby cost or the power is cut off. Because. Specifically, when the state where the current value detected by the supply current detection current sensor 24 is equal to or less than the standby current of 3 mA continues for a standby time of 15 seconds or more, the power supply switch 25 is instructed to be turned off. . Whether or not the continuation is longer than the waiting time can be counted by providing a special timer, or may be counted in the program.

  The reason why the vendor ID is stored in the ROM 31 is to stop the power supply to the imitation manufactured by a person other than the authorized manufacturer, and a detailed description thereof will be omitted. The manufacturer ID can be verified by storing the vendor ID and checking whether or not the vendor ID read from the ROM 31 is registered in the table 23c.

  The reason why the version is stored in the ROM 31 is to prevent an error in the power supply procedure when the versions are different. For example, when the pin arrangement is changed when the version of the output cable is changed, it becomes a big problem how to supply power with which polarity. Therefore, if the version is not registered in the table, it can be protected by stopping the power supply.

  The reason why the user ID is stored in the ROM 31 is to prevent unauthorized use of power by other than a legitimate user. Again, by registering a user ID in the table 23c in advance and collating it with the user ID read from the ROM 31, it is possible to confirm whether or not the user is the user who supplies power.

  Next, an example of the table 23c will be described. As shown in FIG. 4, here, a case where an output voltage conversion table and an output current conversion conversion table are used is shown. That is, the feedback control is performed not only on the output voltage but also on the output current. This is because it may be desired to control the output current. However, when the control information shown in FIG. 3 is used, it is sufficient to have an output voltage table.

  The table 23c shows a case where the ASCII code of the output voltage or output current and the circuit control data output to the DAC 23e are stored in association with each other. Although the case where the circuit control data is an 8-bit bit string is shown here, other bit lengths can be used. For convenience of explanation, explanation of data corresponding to the vendor ID and the like is omitted here.

  Next, the processing procedure of the software control converter 23 shown in FIGS. 1 and 2 will be described. 5 to 7 are flowcharts showing the processing procedure of the software control converter 23 shown in FIGS. Here, it is assumed that the same control information shown in FIG. 3 is stored redundantly in areas 1 and 2 in the ROM 31. This is to cope with an error in reading control information.

  The software control converter 23 first checks whether or not the output cable 30 is connected to the main unit 20 (step S101). If not connected (No in step S101), an error is displayed and the power source main unit is stopped. Error processing is performed (step S111).

  On the other hand, when the output cable 30 is connected (Yes in step S101), power is supplied from the ROM power supply unit 26 to the ROM 31 (step S102), and the vendor ID is read from the ROM 31 of the output cable 30. (Step S103). If the vendor ID is not appropriate (No at Step S104), an error process is performed to display an error and stop the power supply body (Step S111).

  On the other hand, if the vendor ID is appropriate (Yes at Step S104), the version data is read from the ROM 31 (Step S105), and it is checked whether the version is appropriate (Step S106). (No in step S106), error processing is performed to display an error and stop the power supply main body (step S111).

  On the other hand, when the version is appropriate (Yes at Step S106), the output control data (output voltage, maximum supply current, standby current, standby time) is read from the area 1 of the ROM 31 (Step S107). Then, output control data (output voltage, maximum supply current, standby current, standby time) is read from area 2 of ROM 31 (step S108), and both are compared (step S109).

  As a result, if the two do not match (No at Step S109), an error process is performed to display an error and stop the power source body (Step S111). If both match (Yes at Step S109), output control is performed. Circuit control data (actual control code) corresponding to the output voltage included in the data is acquired from the table 23c (step S110).

  Thereafter, the acquired circuit control data is output to the DAC 23e, converted into analog data, and the analog data is output to the comparator 22b, thereby generating an output voltage based on the circuit control data (actual control code) (step). S112), the output voltage is confirmed through the ADC 23f (step S113).

  Then, it is checked whether or not the output voltage is within a predetermined error with the output voltage indicated in the circuit control data (actual control code) (step S114). ), Error processing is performed to display an error and stop the power supply body (step S116).

  On the other hand, when it is within the predetermined error (Yes at Step S115), the power supply switch is turned on to output the output voltage to the output cable (Step S117), and the output current is equal to or less than the maximum current value. (Step S118), if not less than the maximum current value (No in step S119), after performing output current control (step S120), the process proceeds to step S118 to check the output current. .

  If the output current becomes equal to or less than the maximum current value (Yes at step S119), it is checked whether or not the output voltage is within a predetermined error from the output voltage indicated in the circuit control data (actual control code). (Step S121).

  If the error is not within the predetermined error (No at Step S122), the output value is corrected (Step S123). If the error is within the predetermined error (Yes at Step S122), the output current is the standby current value. It is checked whether or not this is the case (step S124). If it is equal to or greater than the standby current value (Yes in step S125), the process proceeds to step S118 and the same determination process is repeated.

  On the other hand, if the standby current value is not reached (No at Step S125), the standby time is measured (Step S126). If the standby time is within the set value (Yes at Step S127), the process proceeds to Step S118 and the same. Repeat the judgment process. If the standby time is greater than or equal to the set value (No at step S127), the power is automatically turned off (step S128).

  As described above, in the present embodiment, control information related to the power supplied to the load device is stored as text data in the ROM 31 provided in the output cable 30 and the control information and the power conversion unit 22 are controlled. When the output cable 30 is connected to the main unit 20, the control information is read from the ROM 31 to correspond to the control information. Circuit control data to be acquired from the table 23c, and the power converter 22 is controlled based on the acquired circuit control data. Therefore, when power is supplied to the load device based on the control information stored in the output cable. Thus, it is possible to accurately and efficiently supply power having an output voltage necessary for the load device.

  In this embodiment, as shown in FIG. 2, circuit control data (actual control code) is input to the plus terminal of the comparator 22b via the DAC 23e, and the output from the dividing resistor 22c is minus of the comparator 22b. However, the present invention is not limited to this, and the DAC can be omitted by using an electronically controlled variable resistor as shown in FIG.

  Further, in the present embodiment, the description has been made centering on the case where the circuit control data for the output voltage is acquired from the output voltage included in the control information stored in the ROM 31 using the table 23c, but the table shown in FIG. If used, circuit control data for output current can be acquired from the output current included in the control information stored in the ROM 31.

  Furthermore, in this embodiment, the case where the ROM 31 is provided in the output cable 30 has been described. However, the present invention is not limited to this, and a rewritable EPROM is provided in the output cable 30 instead of the ROM 31. In addition, data can be written from the software control converter 23 of the main unit 20, and the operation of the output cable can be facilitated. In particular, if the error situation is written in such an EPROM, the cause of the error situation can be investigated only with the output cable 30, so that error handling can be speeded up and smoothed. In addition, for example, the number of times of use of 1000 times can be stored in the EPROM, and the number of times of use can be limited by subtracting the number of times of use and rewriting it in the EPROM every time it is used.

  The power supply device according to the present invention is useful when connecting to a plurality of load devices.

It is a block diagram which shows the whole structure of the power supply device concerning this invention. It is a figure which shows the detailed structure of the main-body part shown in FIG. It is a figure which shows an example of the control information memorize | stored in ROM shown in FIG. 1 and FIG. It is a figure which shows an example of the data memorize | stored in the table shown in FIG. 1 and FIG. It is a flowchart (1) which shows the process sequence of the software control converter shown in FIG. 1 and FIG. It is a flowchart (2) which shows the process sequence of the software control converter shown in FIG. 1 and FIG. It is a flowchart (3) which shows the process sequence of the software control converter shown in FIG. 1 and FIG. It is a figure which shows the modification of a main-body part. It is explanatory drawing (1) for demonstrating a prior art. It is explanatory drawing (2) for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power generation part 20 Main body part 21 Power storage part 22 Power conversion part 22a Switching regulator 22b Comparator 22c Dividing resistor 23 Software control converter 23a CPU
23b Storage unit 23c Table 23d ROM interface 23e Digital analog converter (DAC)
23f Analog to digital converter (ADC)
24 Current sensor for supply current detection 25 Power supply switch 26 Power supply unit for ROM 30 Output cable 31 ROM
40 Load device

Claims (8)

A power supply device comprising a power supply main body that supplies power, a load device that consumes power, and an output cable mounted between the power supply main body,
The output cable includes storage means for storing control information including an output voltage to be output to the load device,
The power supply body unit corresponds to power conversion means for converting power received from the outside , and control information stored in the storage means in the output cable , and relates to variations in circuit characteristics included in the power conversion means. Control means for controlling the power output from the power conversion means based on circuit control data including information ,
The control means includes a table associating a plurality of output voltages with circuit control data used when controlling the power conversion means, and circuit control data corresponding to the output voltage stored in the storage means in the output cable. Is extracted from the table, and the power conversion means is controlled based on the extracted circuit control data. The table stores a bit string of a predetermined number of bits as the circuit control data, and the power conversion unit feedback-controls the output voltage of the power conversion unit using analog data obtained by digital / analog conversion of the bit string as a target value. The power supply device according to claim 1 . The storage means stores control information including an output current output to the load device, and the control means associates a plurality of output currents with circuit control data used when controlling the power conversion means. The circuit control data corresponding to the output current stored in the storage means in the output cable is extracted from the table, and the power conversion means is controlled based on the extracted circuit control data. Item 3. The power supply device according to Item 1 or 2 . The storage unit stores control information including a maximum supply current to be output to the load device, and the control unit compares the output current output from the power conversion unit with the maximum supply current, and outputs the output current. There If greater than the maximum supply current, the power supply device according to claim 1, 2 or 3 wherein the output current and controls the power conversion means so as to be less than the maximum supply current. The storage means stores control information including a standby current and a standby time that are output when the load device is on standby, and the control means is in a state where the output current output to the load device is equal to or less than the standby current. when continued for a time, the power supply device according to any one of claims 1 to 4, characterized in that control to stop the power supply to the load device. The storage means further stores user information for identifying a user of the load device, version information of the load device and / or manufacturer information for manufacturing the load device as part of the control information, and the control means , the user information, based on the version information and / or manufacturer information according to any one of claims 1 to 5, wherein the controller controls the power supply to the load device via the output cable Power supply. The storage means is a rewritable EPROM, the power supply device according to any one of claims 1-6, wherein the control information stored in the storage means is characterized in that it is rewritten by the control means . 8. The power supply apparatus according to claim 7 , wherein the control unit sequentially stores an error report in a predetermined area of the storage unit when an error occurs.

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