JP2017033899A - Power supply device, electronic equipment and electronic equipment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device, electronic equipment and an electronic equipment system that can perform simultaneously perform authentication and current leakage detection with a simple circuit configuration.SOLUTION: An electronic equipment system 1 includes a power supply device 10 and electronic equipment 30. The power supply device 10 includes a rectifier 11 for converting power supplied from an external power supply 50 to direct current, and a constant voltage output unit 12 for outputting the converted DC power with a first DC voltage value V1. Further, the power supply device 10 includes a positive electrode terminal 14, a ground terminal 15, a first detection resistor 16 having a first resistance value R1, a second detection resistor 17 having a second resistance value R2, and a processor 18. By detecting a second DC voltage value V2 and a third DC voltage value which are smaller than the first DC voltage value V1, the processor 18 can perform authentication that it is connected to the authorized electronic equipment 30 and the current leakage detection.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a power supply device, an electronic device, and an electronic device system.

  A power supply device and an electronic device are connected to charge a secondary battery of the electronic device, but the electronic device is generally designed on the assumption that a dedicated secondary battery is used. For this reason, when a secondary battery or the like other than a dedicated product is attached to the electronic device, appropriate charge / discharge control may not be performed. Therefore, a technique is known in which when a secondary battery of an electronic device is charged, authentication is performed as to whether or not a regular power supply device and the electronic device are connected (see Patent Document 1).

  In the portable terminal system, portable terminal, and battery pack described in Patent Document 1, a series circuit of an ID resistor element and a first switch means is connected in parallel to the temperature sensitive element on the battery pack side, and the ID If the resistance value of the resistor is within the specified range, authentication is performed to determine that the battery pack is a dedicated product, and the mobile terminal can authenticate the battery pack without increasing the number of terminals of the battery pack. It is disclosed.

JP2015-49935A

  However, the method described in Patent Document 1 has a problem that the authentication circuit is complicated, and at the same time, it is not possible to detect a leakage or the like that is likely to occur in the connection portion.

  It is an object of the present disclosure to provide a power supply device, an electronic device, and an electronic device system that can simultaneously perform authentication and leakage detection with a simple circuit configuration.

  A power supply device according to the present disclosure is a power supply device capable of supplying power to an external electronic device, which has at least a positive electrode terminal and is connectable to the electronic device, and a first direct current A constant voltage output unit that outputs a voltage value V1, and a first detection resistor having both ends electrically connectable to the constant voltage output unit and the positive terminal, and having a first resistance value R1; A second detection resistor having both ends electrically connectable to the constant voltage output unit and the positive terminal, and having a second resistance value R2, and the constant voltage output unit While the first DC voltage value V1 is being output to the positive terminal via the first detection resistor, a second DC voltage in which the voltage at the positive terminal is smaller than the first DC voltage value V1. When the voltage value V2 is reached, the constant voltage output unit passes through the second detection resistor. The first DC voltage value V1 is output to the positive terminal, and then the voltage at the positive terminal becomes a third DC voltage value V3 smaller than the first DC voltage value V1. The constant voltage output unit is directly connected to the positive terminal without passing through the first detection resistor or the second detection resistor, and outputs the first DC voltage value V1.

  The electronic device of the present disclosure is an electronic device that can receive power supply from an external power supply device, and has at least a ground terminal and a positive electrode terminal, and can be connected to the power supply device, and A load portion that can be connected to a positive electrode terminal and that can consume power, and both ends thereof can be electrically connected to the positive electrode terminal and the ground terminal, respectively, and includes a first resistance value R1. And a second detection resistor having both ends electrically connectable to the positive terminal and the ground terminal and having a second resistance value R2, and the positive terminal is the load While the positive terminal is electrically connected to the ground terminal via the first detection resistor, the voltage of the positive terminal is a second direct current. When the voltage value V2 is reached, the positive The terminal is not electrically connected to the load section, and the positive terminal is electrically connected to the ground terminal via at least the second detection resistor, and then the voltage of the positive terminal is When the DC voltage value V3 is 3, the positive terminal is directly electrically connected to at least the load portion.

  An electronic device system of the present disclosure includes the power supply device and the electronic device.

  According to the present disclosure, the DC voltage value is detected a plurality of times in advance using a plurality of detection resistors to determine whether the DC voltage value is a predetermined DC voltage value, and authentication is performed on the power supply device side and the electronic device side. It is possible. Further, by detecting the DC voltage value, it is possible to detect whether or not there is a leakage. By performing authentication and leakage detection in an analog manner, it is possible to reduce the cost before leakage or electric shock occurs. In addition, authentication and leakage detection are possible with a simple circuit configuration that does not require an advanced device that exchanges signals between the power supply and the electronic device, and that does not require an extra terminal for such signals. It is possible to provide an electronic device system capable of performing the above.

1 is a block diagram illustrating an example of an electronic device system according to a first embodiment. FIG. 6 is a flowchart showing an example of the operation of the electronic device system according to the first embodiment. The flowchart figure following FIG. The block diagram which shows an example of the unconnected state of the electronic device system which concerns on 1st Embodiment. The block diagram which shows an example of the electrical leakage detection state of the electronic device system which concerns on 1st Embodiment. The block diagram which shows an example of the connection state of the electronic device system which concerns on 1st Embodiment. FIG. 7 is a block diagram showing a state in which a second DC voltage value V2 following FIG. 6 is detected. FIG. 8 is a block diagram illustrating a voltage flow through a third detection resistor subsequent to FIG. 7. FIG. 9 is a block diagram showing a state in which a third DC voltage value V3 following FIG. 8 is detected. The block diagram which shows an example of the charge condition of the electronic device system which concerns on 1st Embodiment. The block diagram which shows an example of the electronic device system which concerns on 2nd Embodiment. The block diagram which shows an example of the power supply device which concerns on 3rd Embodiment. The block diagram which shows an example of the power supply device which concerns on 4th Embodiment. The block diagram which shows an example of the power supply device which concerns on 5th Embodiment.

(First embodiment)
Hereinafter, an embodiment (hereinafter referred to as “first embodiment”) that specifically discloses a power supply device, an electronic device, and an electronic device system according to the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

  An electronic device system, a power supply device, and an electronic device will be described in detail with reference to FIG.

  The electronic device system 1 of the first embodiment includes a power supply device 10 and an electronic device 30, and the power supply device 10 is also a charger that can supply power to the external electronic device 30. . The electronic device 30 is, for example, a mobile phone such as a smartphone, a tablet, a mobile terminal with a camera, a digital camera, an information terminal such as a measuring instrument or a detector, or the like.

<Power supply unit>
The power supply device 10 can be electrically connected to an external commercial AC power supply (external power supply) 50, and a rectifier 11 that converts electric power supplied from the external power supply 50 into direct current (DC); A constant voltage output unit 12 that outputs the first DC voltage value V1 is provided. In addition, the power supply device 10 includes a connection unit 13 that can be connected to the electronic device 30, and the connection unit 13 includes a positive electrode terminal 14 and a ground terminal 15. Furthermore, the power supply device 10 includes a first detection resistor 16 having a first resistance value R1, a second detection resistor 17 having a second resistance value R2, a processor 18, and a first switch unit. 19, a second switch unit 20, and a third switch unit 21. Further, the connecting portion 13 described above may include a cable 22.

  The first detection resistor 16 and the second detection resistor 17 are connected in parallel, and both ends are electrically connected to the constant voltage output unit 12 and the positive terminal 14, respectively. The first detection resistor 16 is electrically connected to the constant voltage output unit 12 via the first switch unit 19 connected in series, and the second detection resistor 17 is connected in series. The constant voltage output unit 12 is electrically connected via the second switch unit 20. Then, both ends of the third switch unit 21 are electrically connected to the constant voltage output unit 12 and the positive terminal 14 respectively.

  The processor 18 is also a control unit that performs overall control of the power supply device 10, and mainly controls the switch units 19, 20, and 21 from a DC voltage value V based on the potential of the ground terminal 15 acquired from the wiring. To control ON / OFF switching.

  When the power supply device 10 and the electronic device 30 are connected and the electronic device 30 is charged from the power supply device 10, the first DC voltage value V1, which is a reference for the DC voltage value V in the first embodiment, is a portable terminal. It is 5 V generally used for charging the electronic device 30 such as.

  When starting charging, first, the processor 18 turns on only the first switch unit 19, and the first DC voltage value V <b> 1 (5 V) output from the constant voltage output unit 12 is used as the first detection resistor. 16 to output to the positive terminal 14. In the first embodiment, the first resistance value R1 of the first detection resistor 16 is, for example, 30 kΩ. Next, when the voltage of the positive terminal 14 becomes a second DC voltage value V2 (for example, 2V) smaller (lower) than the first DC voltage value V1, the processor 18 turns on only the second switch unit 20. Thus, the first DC voltage value V1 is output to the positive terminal 14 via the second detection resistor 17. In the first embodiment, the second resistance value R2 of the second detection resistor 17 is, for example, 20 kΩ.

  Then, when the voltage at the positive terminal 14 becomes a third DC voltage value V3 (for example, 3V) smaller than the first DC voltage value V1 after a predetermined time has elapsed, the processor 18 detects only the third switch unit 21. Is turned on. Thereby, the constant voltage output unit 12 and the positive electrode terminal 14 are directly electrically connected, and the first DC voltage value V1 output from the constant voltage output unit 12 is output to the positive electrode terminal 14.

  In the first embodiment, it has been described above that the second DC voltage value V2 and the third DC voltage value V3 have different values. However, they may be equal or about the same value. Further, the first resistance value R1 and the second resistance value R2 may be equal to or different from each other. If they are different, it is desirable that the first resistance value R1 is larger than the second resistance value R2.

  Low-cost electronic equipment that does not require advanced devices by enabling a plurality of resistances to detect a voltage change of the DC voltage value V multiple times and enabling authentication of the power supply device 10 and the electronic equipment 30 in an analog manner. System 1 can be provided.

  In addition, it is possible to detect leakage by determining predetermined DC voltage values as the second DC voltage value V2 and the third DC voltage value V3. When a predetermined correct voltage is applied to the positive terminal 14 with respect to the voltage output of the constant voltage output unit 12 through a route through the two detection resistors of the first detection resistor 16 and the second detection resistor 17. If detected by the processor 18, it can be determined that the correct connection has been made and there is no danger of a short circuit.

  When the leakage current is generated in the positive electrode terminal 14 or the like, it is desirable that the value of the leakage current is 5 mA or less in order to prevent electric shock at a level at which the user feels pain. On the other hand, it is known that the minimum current level at which a user can feel a leakage is 0.5 mA. From this point of view, the first resistance value R1 of the first detection resistor 16 is equal to or greater than (the first DC voltage value V1 [V] / 5 [mA]) or (the first DC voltage value V1 [V] / 0.5 [mA]) or more is desirable.

  In addition, Article 58 of the Ministerial Ordinance (Electrical Equipment Technical Standard) that establishes technical standards regarding electrical equipment stipulates that the insulation resistance is 0.1 MΩ or less when the ground voltage is 150 V or lower. In the first embodiment, the first DC voltage value V1 that is a reference for the DC voltage value V is 5 V that is generally used for charging the electronic device 30 such as a portable terminal. Considering the condition that the first DC voltage value V1 is 5V, in order to realize the insulation resistance of 0.1 MΩ or less determined by the electric equipment technical standard, the value of the leakage current becomes 0.5 μA or more, and the first It is desirable that the resistance value R1 is equal to or less than (first DC voltage value V1 [V] /0.5 [μA]).

  If the first resistance value R1 is equal to or greater than (first DC voltage V1 [V] / 50 [mA]), a short circuit determination is performed while suppressing the leakage current to 50 mA or less, which is a level that does not cause burning. Is possible. That is, when the first DC voltage value (charging voltage value) V1 is output from the constant voltage output unit 12 in advance before the power supply device 10 and the electronic device 30 are connected, even if the positive terminal 14 and the ground terminal 15 are output. Leakage current can be suppressed to 50 mA or less even if a short circuit occurs between the two. Thereafter, when the voltage value of the positive terminal 14 becomes a second DC voltage value V2 that is smaller than the first DC voltage value V1 and larger than 0, it can be determined that there is no short circuit. Such a determination can also be made by the configuration of FIG.

<Electronic equipment>
The electronic device 30 includes a connection portion 31 that can be connected to the power supply device 10, and the connection portion 31 includes a positive electrode terminal 32 and a ground terminal 33. Further, the electronic device 30 includes a first detection resistor 34 having a first resistance value R1, a second detection resistor 35 having a second resistance value R2, a processor 36, and a first switch unit. 37, a second switch unit 38, and a third switch unit 39. Further, the electronic device 30 includes a load unit 40 that can consume power supplied from the power supply device 10, and the load unit 40 includes a secondary battery 41.

  The first detection resistor 34 and the second detection resistor 35 of the electronic device 30 are connected in parallel, and both ends are electrically connected to the positive terminal 32 and the ground terminal 33, respectively. The first detection resistor 34 is electrically connected to the positive electrode terminal 32 via the first switch unit 37 connected in series, and the second detection resistor 35 is connected to the first detection resistor 35 in series. It is electrically connected to the positive terminal 32 through the two switch portions 38. The both ends of the third switch unit 39 are electrically connected to the positive terminal 32 and the load unit 40, respectively.

  The processor 36 is also a control unit that performs overall control of the electronic device 30, and mainly controls the switch units 37, 38, 39 from the DC voltage value V based on the potential of the ground terminal 33 obtained from the wiring. To control ON / OFF switching.

  The secondary battery 41 is, for example, a lithium ion battery, a nickel metal hydride battery, or the like. The secondary battery 41 is charged with power supplied from the power supply device 10 and operates various configurations provided in the electronic device 30 with the charged power.

  When the power supply device 10 is connected to the electronic device 30 and the secondary battery 41 of the electronic device 30 is charged from the power supply device 10, the first DC voltage value that is a reference for the DC voltage value V in the first embodiment. V1 is 5V generally used for charging the electronic device 30 such as a portable terminal.

  When starting charging, the processor 36 first turns on only the first switch portion 37 and electrically connects the positive terminal 32 and the ground terminal 33 via the first detection resistor 34. In the first embodiment, the first resistance value R1 of the first detection resistor 34 is, for example, 20 kΩ. Next, when the voltage of the positive terminal 32 becomes the second DC voltage value V2 (for example, 2V), the processor 36 turns on only the second switch unit 38 and sets the positive terminal 32 to the second detection resistor. It is electrically connected to the ground terminal 33 via 35. In the first embodiment, the second resistance value R2 of the second detection resistor 35 is, for example, 30 kΩ.

  Then, when the voltage at the positive terminal 32 becomes a third DC voltage value V3 (for example, 3V) after a predetermined time has elapsed, the processor 36 turns on only the third switch unit 39. Thereby, the positive electrode terminal 32 and the load part 40 are directly electrically connected, the 1st DC voltage value V1 which the constant voltage output part 12 outputs is output to the load part 40, and is supplied to the secondary battery 41. Charging starts. Although only the third switch unit 39 is described as being in the ON state, the first switch unit 37 and the second switch unit 38 may be in the ON state.

  In the first embodiment, it has been described above that the second DC voltage value V2 and the third DC voltage value V3 have different values. However, they may be equal or about the same value. Further, the first resistance value R1 and the second resistance value R2 may be equal to or different from each other. If they are different, it is desirable that the first resistance value R1 is smaller than the second resistance value R2.

  Low-cost electronic equipment that does not require advanced devices by enabling a plurality of resistances to detect a voltage change of the DC voltage value V multiple times and enabling authentication of the power supply device 10 and the electronic equipment 30 in an analog manner. System 1 can be provided.

  Next, an example of the operation of the electronic device system 1 will be described in detail with reference to the flowcharts of FIGS. In the flowchart, the right side of the drawing is the flow of the power supply device 10, and the left side is the flow of the electronic device 30. In the detailed description, FIGS. 4 to 10 are used to make the electrical flow easy to understand.

  The power supply apparatus 10 is connected to the external power supply 50, and the power supply apparatus 10 is turned on so that the first DC voltage value V1 can be output from the constant voltage output section 12 to the positive terminal 14 (step S10) <FIG. See>. Next, the processor 18 of the power supply apparatus 10 turns on only the first switch unit 19 to instruct the constant voltage output unit 12, and the constant voltage output unit 12 is positively connected via the first detection resistor 16. The first DC voltage value V1 is output to the terminal 14 (step S11). Then, the processor 18 turns off the third switch unit 21 and turns off the charging output from the positive terminal 14 to enter the authentication detection mode (step S12). In FIG. 4 and subsequent figures, the power flow is indicated by thick arrows.

  Further, the processor 18 detects the second DC voltage value V2 applied to the positive terminal 14, and is the predetermined voltage value or more, for example, 0.5V or more (or 0.3V or more) that is not short-circuited? It is determined whether or not (step S13) <see FIG. Since the leakage current felt by the human body in the case of leakage is 0.5 mA (500 μA) or more, it can be said that it is harmless if it is 150 μA or less for the user. Therefore, by setting the resistance value R3 in short circuit to less than 3.3 kΩ , A leakage current of 150 μA or more can be detected in advance.

  When the processor 18 determines that there is no leakage (Yes in step S13), the connection between the power supply device 10 and the electronic device 30 is continued (step S50). When it is determined that there is a leakage (No in step S13), a buzzer or the like It is possible to inform the user by means of Further, even when the user connects the power supply device 10 and the electronic device 30, authentication with the electronic device 30 and charging of the electronic device 30 are not started.

  On the other hand, when the power source of the electronic device 30 is turned on (step S30), the processor 36 of the electronic device 30 turns on the first switch unit 37 (step S31). The processor 36 turns off the third switch unit 39 to enter the authentication detection mode in a state where the secondary battery 41 is not charged (step S32). See FIG. 4 for the authentication detection mode.

  When the power supply device 10 and the electronic device 30 are connected, the processor 18 of the power supply device 10 determines whether or not a second DC voltage value V2 (for example, 2 V) that is a bias voltage is detected (step S14). <See FIG. 6>. At the same time, the processor 36 of the electronic device 30 also determines whether or not the second DC voltage value V2 is detected (step S33). Then, both the processors 18 and 36 detect the second DC voltage value V2 (for example, 2V ± 0.1V) <see FIG. 7>.

  When both the processors 18 and 36 detect the second DC voltage value V2 (Yes in Step S14 and Yes in Step S33), the processors 18 and 36 turn off the first switch sections 19 and 37, The second switch sections 20 and 38 are turned on (step S15 and step S34). <See FIG. 8>. Then, the processor 18 instructs the constant voltage output unit 12, and the constant voltage output unit 12 outputs the first DC voltage value V <b> 1 to the positive terminal 14 through the second detection resistor 17.

  After a predetermined time has elapsed (step S16 and step S35), each of the processors 18 and 36 determines whether or not the third DC voltage value V3 is detected (step S17 and step S36). Then, both processors 18 and 36 detect a third DC voltage value V3 (for example, 3V ± 0.1V) <see FIG. 9>.

  When the third DC voltage value V3 is detected (Yes in step S17 and Yes in step S36), after the predetermined time has elapsed (step S18 and step S37), is the third DC voltage value V3 detected again? It is determined whether or not (step S19 and step S38). When the third DC voltage value V3 is detected (Yes in step S19 and Yes in step S38), the power supply device 10 outputs the first DC voltage value V1 from the connection unit 13 (step S20), and the electronic device 30 starts charging the secondary battery 41 (step S39). <See Fig. 10>

  When the processor 18 of the power supply device 10 cannot acquire the third DC voltage value V3 (No in step S17 or step S19), the processor 18 turns on only the first switch unit 19 to perform the first detection. Detection of the second DC voltage value V2 via the resistor 16 is executed. Similarly, when the electronic device 30 cannot acquire the third DC voltage value V3 (No in step S36 or step S38), the processor 36 turns on only the first switch unit 37 and sets the first detection resistor The detection of the second DC voltage value V2 via 34 is executed.

In the authentication determination from step S14 to step S19 in the power supply apparatus 10 described above, the probability that the power supply apparatus 10 erroneously outputs 5V can be determined as follows.
(1) Probability that the output of the power supply device 10 contacts the object A and the resistance value of the object A is 20 kΩ.
(2) Probability of contacting another object B within a predetermined time of step S16 after contacting the object A.
(3) Probability that the resistance value of the object B is 30 kΩ.

  (1) (2) (3) If each event occurrence probability is uniformly 1%, the probability that (1), (2), and (3) occur continuously is 1/100 × 1/100 × 1 /. Since 100 = 1 / 1,000,000, which is 1 / 1,000,000, and actually less than 1%, the probability of accidental erroneous authentication occurring can be determined to be almost zero. Therefore, the power supply device 10 having the configuration of the present disclosure has almost no erroneous authentication, and the same applies to the electronic device 30.

  As described above, the power supply device 10 according to the first embodiment is a power supply device 10 that can supply power to the external electronic device 30, has at least the positive electrode terminal 14, and can be connected to the electronic device 30. Connecting portion 13, constant voltage output portion 12 that outputs DC voltage value V 1 upon receiving power supply from external power supply 50, and both ends can be electrically connected to constant voltage output portion 12 and positive electrode terminal 14, respectively. The both ends of the first detection resistor 16 having the first resistance value R1 can be electrically connected to the constant voltage output unit 12 and the positive electrode terminal 14, and the second resistance value R2 is And the constant voltage output unit 12 outputs the first DC voltage value V1 to the positive electrode terminal 14 via the first detection resistor 16. Is less than the first DC voltage value V1, the second When the DC voltage value V2 is reached, the constant voltage output unit 12 outputs the first DC voltage value V1 to the positive electrode terminal 14 via the second detection resistor 17, and then the voltage of the positive electrode terminal 14 is When the third DC voltage value V3 is smaller than the first DC voltage value V1, the constant voltage output unit 12 does not go through the first detection resistor 16 or the second detection resistor 17 and is connected to the positive terminal 14. Directly connected electrically and outputs the first DC voltage value V1.

  As a result, a DC voltage value is detected a plurality of times in advance using a plurality of detection resistors (first detection resistor 16 and second detection resistor 17), and a predetermined DC voltage value (second DC voltage value V2 or first detection resistor 17) is detected. 3, the electronic device 30 can be authenticated from the power supply device 10 side. In addition, it is possible to detect whether or not there is a leakage by detecting a DC voltage value greater than 0V. By performing authentication and leakage detection in an analog manner, it is possible to reduce the cost before leakage or electric shock occurs. In addition, with a simple circuit configuration that does not require an advanced device that performs signal exchange between the power supply apparatus 10 and the electronic device 30 and that does not require an extra terminal for such a signal, authentication and Electric leakage detection can be performed. Then, after the authentication is completed, the power supply device 10 can supply power to the regular electronic device 30.

  Further, while the constant voltage output unit 12 outputs the first DC voltage value V1 to the positive electrode terminal 14 via the first detection resistor 16, the voltage at the positive electrode terminal 14 is changed to the first DC voltage value V1. When the second DC voltage value V2 is smaller, the constant voltage output unit 12 outputs the first DC voltage value V1 to the positive terminal 14 via the second detection resistor 17, and then the predetermined time elapses. Later, when the voltage at the positive terminal 14 becomes the third DC voltage value V3, which is smaller than the first DC voltage value V1, the constant voltage output unit 12 receives the first detection resistor 16 or the second detection resistor. The first direct current voltage value V1 is output by directly electrically connecting to the positive terminal 14 without going through 17.

  Thereby, since the DC voltage value is detected again after a predetermined time has elapsed, the DC voltage value can be reliably detected, and the authentication accuracy is improved. In addition, a predetermined correct voltage is applied to the positive terminal 14 with respect to the voltage output of the constant voltage output unit 12 through the route through the two detection resistors of the first detection resistor 16 and the second detection resistor 17. If it is detected, it can be determined that the correct connection has been made and there is no danger of a short circuit.

  Further, the second DC voltage value V2 is equal to the third DC voltage value V3. Thereby, since the same DC voltage value is detected twice, authentication and leakage detection are possible.

  Further, the second DC voltage value V2 and the third DC voltage value V3 are different. This improves the accuracy of authentication and leakage detection.

  Further, the first resistance value R1 is equal to the second resistance value R2. This makes it possible to obtain the same DC voltage value.

  Further, the first resistance value R1 and the second resistance value R2 are different. This makes it possible to obtain different DC voltage values.

  Further, the first resistance value R1 is larger than the second resistance value R2. This makes it possible to systematically obtain voltage values with different DC voltage values.

  Further, the first resistance value R1 is equal to or greater than (first DC voltage value V1 [V] / 5 [mA]). Thereby, it becomes possible to obtain a resistance value corresponding to an electric shock countermeasure.

  The first resistance value R1 is equal to or greater than (first DC voltage value V1 [V] /0.5 [mA]). As a result, it is possible to take measures against electric leakage with the minimum current that the human body can feel.

  Further, the first resistance value R1 is equal to or less than (first DC voltage value V1 [V] /0.5 [μA]). This makes it possible to use a resistance value of 0.1 MΩ or less according to Article 58 of the Ministerial Ordinance (Electrical Equipment Technical Standards) that establishes technical standards concerning electrical equipment.

  The connection unit 13 further includes a ground terminal 15, the first DC voltage value V 1 is based on the potential of the ground terminal 15, and the second DC voltage value V 2 is the potential of the ground terminal 15. The third DC voltage value V3 is based on the potential of the ground terminal 15. This makes it easy to determine whether or not a short circuit (0 V) has occurred.

  As described above, the electronic device 30 according to the first embodiment is an electronic device 30 that can be supplied with power from the external power supply device 10, and has at least the ground terminal 33 and the positive electrode terminal 32. Can be connected to the positive terminal 32 and can be connected to the positive terminal 32, and both ends can be electrically connected to the positive terminal 32 and the ground terminal 33, respectively. A first detection resistor 34 having a first resistance value R1 and both ends thereof can be electrically connected to the positive terminal 32 and the ground terminal 33, respectively, and a second detection value having a second resistance value R2 The positive electrode terminal 32 is not electrically connected to the load section 40, and the positive electrode terminal 32 is electrically connected to the ground terminal 33 via the first detection resistor 34. And positive terminal 32. When the voltage reaches the second DC voltage value V2, the positive terminal 32 is not electrically connected to the load unit 40, and the positive terminal 32 is electrically connected to the ground terminal 33 via at least the second detection resistor 35. Then, when the voltage of the positive terminal 32 reaches the third DC voltage value V3, the positive terminal 32 is electrically connected directly to at least the load unit 40.

  As a result, a DC voltage value is detected a plurality of times in advance using a plurality of detection resistors (first detection resistor 34 and second detection resistor 35), and a predetermined DC voltage value (second DC voltage value V2 or first detection resistor 35) is detected. It is possible to authenticate the power supply device 10 from the electronic device 30 side. In addition, it is possible to detect whether or not there is a leakage by detecting a DC voltage value greater than 0V. By performing authentication and leakage detection in an analog manner, it is possible to reduce the cost before leakage or electric shock occurs. In addition, with a simple circuit configuration that does not require an advanced device that performs signal exchange between the power supply apparatus 10 and the electronic device 30 and that does not require an extra terminal for such a signal, authentication and Electric leakage detection can be performed. After the authentication is completed, the electronic device 30 can acquire the charging voltage value from the regular power supply device 10 and supply power to the load unit 40.

  The load unit 40 includes a secondary battery 41, the positive electrode terminal 32 is not electrically connected to the load unit, and the positive electrode terminal 32 is connected to the ground terminal 33 via the first detection resistor 34. When the voltage of the positive terminal 32 becomes the second DC voltage value V2 while being electrically connected, the positive terminal 32 is not electrically connected to the load section 40, and the positive terminal 32 is at least When the voltage is positively connected to the ground terminal 33 via the second detection resistor 35 and then the voltage of the positive terminal 32 becomes the third DC voltage value V3, the positive terminal 32 is at least a load portion. The secondary battery 41 is started to be charged by being electrically connected directly to 40.

  Thereby, after the authentication is completed, the electronic device 30 acquires the charging voltage value from the regular power supply device 10, supplies power to the secondary battery 41 of the load unit 40, and starts charging the secondary battery 41. It becomes possible.

  Further, while the positive terminal 32 is not electrically connected to the load unit 40 and the positive terminal 32 is electrically connected to the ground terminal 33 via the first detection resistor 34, the positive terminal 32 is provided. Is equal to the second DC voltage value V2, the positive terminal 32 is not electrically connected to the load section 40, and the positive terminal 32 is connected to the ground terminal 33 via at least the second detection resistor 35. When the voltage of the positive electrode terminal 32 reaches the third DC voltage value V3 after the electrical connection and the next predetermined time has elapsed, the positive electrode terminal 32 is directly electrically connected to at least the load unit 40. .

  Thereby, since the DC voltage value is detected again after a predetermined time has elapsed, the DC voltage value can be reliably detected, and the authentication accuracy is improved. In addition, a predetermined correct voltage is connected to the ground terminal 33 with respect to the voltage output from the power supply device 10 through a route through the two detection resistors of the first detection resistor 34 and the second detection resistor 35. If it is applied to the positive electrode terminal 32 and detected in the meantime, it can be determined that the correct connection has been made and there is no danger of a short circuit.

  The second DC voltage value V2 is equal to the third DC voltage value V3. Thereby, since the same DC voltage value is detected twice, authentication and leakage detection are possible.

  The second DC voltage value V2 and the third DC voltage value V3 are different. This improves the accuracy of authentication and leakage detection.

  The first resistance value R1 is equal to the second resistance value R2. Thereby, it becomes possible to obtain the same DC voltage value.

  The first resistance value R1 and the second resistance value R2 are different. This makes it possible to obtain different DC voltage values.

  The first resistance value R1 is larger than the second resistance value R2. This makes it possible to systematically obtain voltage values with different DC voltage values.

  The second DC voltage value V2 is based on the potential of the ground terminal 33, and the third DC voltage value V3 is based on the potential of the ground terminal 33. It is easy to determine whether it is (0V).

  As described above, the power supply device 10 according to the first embodiment is a power supply device 10 that can supply power to the external electronic device 30, has at least the positive electrode terminal 14, and can be connected to the electronic device 30. Electrical connection unit 13, constant voltage output unit 12 that receives power supply from external power supply 50 and outputs first DC voltage value V 1, and both ends are electrically connected to constant voltage output unit 12 and positive electrode terminal 14, respectively. And the detection resistor 16 having a predetermined resistance value R, while the constant voltage output unit 12 outputs the first DC voltage value V1 to the positive terminal 14 via the detection resistor 16. When the DC voltage value of the positive electrode terminal 14 becomes the second DC voltage value V2 which is smaller than the first DC voltage value V1 and larger than 0, the constant voltage output unit 12 does not go through the detection resistor 16 but the positive terminal 14 is directly electrically connected to the first The power supply device 10 which outputs a voltage value V1, the predetermined resistance value R, is (first DC voltage value V1 [V] / 50 [mA]) or more.

  As a result, the DC voltage value is detected using a single detection resistor (detection resistor 16) to determine whether the DC voltage value is a predetermined DC voltage value (second DC voltage value V2). Thus, it is possible to perform authentication of the electronic device 30. In addition, it is possible to detect whether or not there is a leakage by detecting a DC voltage value greater than 0V. By performing authentication and leakage detection in an analog manner, it is possible to reduce the cost before leakage or electric shock occurs. In addition, with a simple circuit configuration that does not require an advanced device that performs signal exchange between the power supply apparatus 10 and the electronic device 30 and that does not require an extra terminal for such a signal, authentication and Electric leakage detection can be performed. Then, after the authentication is completed, the power supply device 10 can supply power to the regular electronic device 30. Further, since the first resistance value R1 is (first DC voltage V1 [V] / 50 [mA]) or more, a short circuit determination is performed while suppressing the leakage current to 50 mA or less, which is a level that does not cause burning. Is possible.

  The predetermined resistance value R is equal to or greater than (first DC voltage value V1 [V] / 5 [mA]). Thereby, it becomes possible to obtain a resistance value corresponding to an electric shock countermeasure.

  The predetermined resistance value R is equal to or greater than (first DC voltage value V1 [V] /0.5 [mA]). As a result, it is possible to take measures against electric leakage with the minimum current that the human body can feel.

  The predetermined resistance value R is equal to or less than (first DC voltage value V1 [V] /0.5 [μA]). This makes it possible to use a resistance value of 0.1 MΩ or less according to Article 58 of the Ministerial Ordinance (Electrical Equipment Technical Standards) that establishes technical standards concerning electrical equipment.

  The connection unit 13 further includes a ground terminal 15, the first DC voltage value V 1 is based on the potential of the ground terminal 15, and the second DC voltage value V 2 is based on the potential of the ground terminal 15. It is a thing. This makes it easy to determine whether or not a short circuit (0 V) has occurred.

  The first DC voltage value V1 is 5V, and the predetermined resistance value R is 0.1 kΩ or more. Thereby, it is possible to make a short circuit determination while suppressing the leakage current to 50 mA or less, which is a level that does not cause burning.

  The predetermined resistance value R is 0.1 MΩ or less. This makes it possible to use a resistance value of 0.1 MΩ or less according to Article 58 of the Ministerial Ordinance (Electrical Equipment Technical Standards) that establishes technical standards concerning electrical equipment.

  As described above, the electronic device 30 according to the first embodiment is an electronic device 30 that can be supplied with power from the external power supply device 10, and has at least the ground terminal 33 and the positive electrode terminal 32. Can be connected to the positive terminal 32 and can be connected to the positive terminal 32, and both ends can be electrically connected to the positive terminal 32 and the ground terminal 33, respectively. A first detection resistor 34 having a first resistance value R1, the positive electrode terminal 32 is not electrically connected to the load section 40, and the positive electrode terminal 32 is connected via the first detection resistor 34. When the voltage of the positive terminal 32 becomes the second DC voltage value V2 while being electrically connected to the ground terminal 33, the positive terminal 32 is directly electrically connected to at least the load unit 40. Connected.

  Thus, the DC voltage value is detected using a single detection resistor (first detection resistor 34), and it is determined whether or not the DC voltage value is a predetermined DC voltage value (second DC voltage value V2). The power supply device 10 can be authenticated from the device 30 side. In addition, it is possible to detect whether or not there is a leakage by detecting a DC voltage value greater than 0V. By performing authentication and leakage detection in an analog manner, it is possible to reduce the cost before leakage or electric shock occurs. In addition, with a simple circuit configuration that does not require an advanced device that performs signal exchange between the power supply apparatus 10 and the electronic device 30 and that does not require an extra terminal for such a signal, authentication and Electric leakage detection can be performed. After the authentication is completed, the electronic device 30 can acquire the charging voltage value from the regular power supply device 10 and supply power to the load unit 40.

  The load unit 40 includes a secondary battery 41, the positive electrode terminal 32 is not electrically connected to the load unit 40, and the positive electrode terminal 32 is electrically connected to the ground terminal 33 via the first detection resistor 34. When the voltage of the positive terminal 32 becomes the second DC voltage value V2 while being connected to the battery, the positive terminal 32 is electrically connected at least directly to the load section 40 and the secondary battery 41 is connected. Charging is started. After the authentication is completed, the electronic device 30 can acquire the charging voltage value from the regular power supply device 10 and supply power to the load unit 40.

  The second DC voltage value V2 is based on the potential of the ground terminal 33. This makes it easy to determine whether or not a short circuit (0 V) has occurred.

  As described above, the electronic device system 1 of the first embodiment includes the power supply device 10 and the electronic device 30. As a result, it is possible to authenticate with a simple circuit configuration that does not require an advanced device for exchanging signals between the power supply device 10 and the electronic device 30, and does not need to provide extra terminals for such signals. It is possible to provide the electronic device system 1 that can detect the leakage.

(Second Embodiment)
FIG. 11 is a block diagram illustrating a configuration of an electronic device system 101 according to the second embodiment of the present disclosure. In FIG. 11, parts that are the same as those in the electronic device system 1 of the first embodiment are given the same reference numerals, and descriptions thereof are omitted in principle. As shown in FIG. 11, it corresponds to the first detection resistor 16 of FIG. 1, and a predetermined resistance value R (for example, when the first DC voltage value V1 is 5 V, the resistance value R is 0.1 kΩ or more). Such a determination can also be made by the second embodiment including one detection resistor 16 provided. When the voltage value of the positive electrode terminal 14 is the second DC voltage value V2, the second DC voltage value V2 is larger than 0, for example, 0.5V (or 0.3V) or more, short-circuited. It can be determined that it is not. The constant voltage output unit 12 can output the first DC voltage value (charge voltage value) V1.

  In FIG. 11, the first resistance value R1 is equal to or greater than (first DC voltage value V1 [V] / 50 [mA]), and is in a state before the power supply device 100 and the electronic device 130 are connected. The first DC voltage value (charge voltage value) V1 is output from the constant voltage output unit 12 in advance (steps S10 to S13). In this case, when the processors 18 and 36 detect the second DC voltage value V2 (Yes in Step S14 and Yes in Step S33), the power supply device 100 immediately determines that the correct connection is secured, The first DC voltage value V1 is output from the connection unit 13 (step S20), and the electronic device 130 starts charging the secondary battery 41 (step S39). <See Fig. 10>

(Third embodiment)
FIG. 12 is a block diagram illustrating a configuration of a power supply device 200 according to the third embodiment of the present disclosure. In FIG. 12, parts that are the same as those of the power supply apparatus 10 of the first embodiment are given the same reference numerals, and descriptions thereof are omitted. The external power supply 250 receives an alternating current output from the external power supply 50 that outputs alternating current, converts the alternating current into direct current, and outputs a direct current of a predetermined voltage (for example, 5 V). The constant voltage output unit 212 is connected to the external power source 250, and the first switch unit 19, the second switch unit 20, the third switch unit 21 and the like are not particularly converted from the DC voltage from the external power source 250. Output to. Specifically, the constant voltage output unit 212 is a connector or the like to which the external power supply 250 is connected. That is, the constant voltage output unit 212 only needs to receive power supplied from an external power supply and output a predetermined DC voltage, and has no particular electrical conversion function, and simply outputs an external DC voltage as it is. It is.

  Here, in the power supply device 200, the cable 22 may be omitted and the connection unit 13 may be integrated with the power supply device 200.

  An example of the power supply device 200 is a charging stand that is for an electronic device such as a smartphone and to which a charger (external power source 250) is connected.

(Fourth embodiment)
FIG. 13 is a block diagram illustrating a configuration of a power supply device 300 according to the fourth embodiment of the present disclosure. In FIG. 13, parts common to the power supply device 10 of the first embodiment are denoted by the same reference numerals and description thereof is omitted. The external power supply 350 outputs a direct current of a predetermined voltage (for example, 12V). The constant voltage output unit 312 receives a DC voltage from the external power supply 350 and converts it to a DC voltage of a predetermined voltage (for example, 5V), and the first switch unit 19, the second switch unit 20, the third switch unit 312. Is output to the switch unit 21 and the like. Specifically, the constant voltage output unit 312 is a DC / DC converter or the like that converts a high voltage (12 V) to a low voltage (5 V).

  As an example of the power supply apparatus 300, an in-vehicle DC adapter connected to a car cigarette lighter socket (external power supply 350) may be mentioned.

(Fifth embodiment)
FIG. 14 is a block diagram illustrating a configuration of a power supply device 400 according to the fifth embodiment of the present disclosure. In FIG. 14, parts common to the power supply device 10 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The battery 413 outputs a direct current of a predetermined voltage (for example, 3.8 V). The constant voltage output unit 412 receives a DC voltage from the battery 413, converts it to a DC voltage of a predetermined voltage (for example, 5V), and converts the first switch unit 19, the second switch unit 20, and the third switch Output to the switch unit 21 and the like. Specifically, the constant voltage output unit 412 is a DC / DC converter or the like that converts a low voltage (3.8 V) to a high voltage (5 V).

  Note that the battery 413 may be a primary battery such as an alkaline battery or a manganese battery, or may be a secondary battery such as a nickel metal hydride battery or a lithium ion battery.

  Alternatively, the DC / DC converter may be omitted, and the DC voltage from the battery 413 may be directly output to the first switch unit 19, the second switch unit 20, the third switch unit 21, and the like. In this case, the battery 413 can be regarded as a constant voltage output unit.

  An example of the power supply device 400 is a mobile battery.

  The embodiments of the power supply device, the electronic device, and the electronic device system according to the present disclosure have been described above with reference to the drawings. However, the present disclosure is not limited to the example. It is obvious for those skilled in the art that various modifications, modifications, substitutions, additions, deletions, and equivalents can be conceived within the scope of the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

  Although the first resistance value, the second resistance value, etc., the first, second, etc. are used for explanation, they are not particularly limited terms. Further, although 2V is described above as an example of the second DC voltage value V2, it may be 2V ± 0.1V, and 3V is described as an example of the third DC voltage value V3, but may be 3V ± 0.1V.

  The power supply device, the electronic device, and the electronic device system according to the present disclosure require authentication and leakage detection, and can be suitably used in the field of charging the secondary battery of the electronic device using the power supply device.

DESCRIPTION OF SYMBOLS 1,101: Electronic device system 10, 100, 200, 300, 400: Power supply device 11: Rectifier 12, 212, 312, 412: Constant voltage output part 13: Connection part 14: Positive electrode terminal 15: Ground terminal 16: 1st Detection resistor (detection resistor)
17: 2nd detection resistance 18: Processor 19: 1st switch part 20: 2nd switch part 21: 3rd switch part 30, 130: Electronic equipment 31: Connection part 32: Positive electrode terminal 33: Ground terminal 34 : First detection resistor (detection resistor)
35: 2nd detection resistance 36: Processor 37: 1st switch part 38: 2nd switch part 39: 3rd switch part 40: Load part 41: Secondary battery 50: External power supply (alternating current)
250, 350: External power supply (DC)

Claims (22)

A power supply device capable of supplying power to an external electronic device,
A connection portion having at least a positive electrode terminal and connectable to the electronic device;
A constant voltage output unit for outputting a first DC voltage value V1,
Both ends can be electrically connected to the constant voltage output unit and the positive terminal, respectively, and a first detection resistor having a first resistance value R1,
A second detection resistor having both ends electrically connectable to the constant voltage output unit and the positive electrode terminal and having a second resistance value R2,
While the constant voltage output unit outputs the first DC voltage value V1 to the positive terminal via the first detection resistor, the voltage of the positive terminal is changed to the first DC voltage value V1. When the second DC voltage value V2 is smaller, the constant voltage output unit outputs the first DC voltage value V1 to the positive terminal via the second detection resistor,
Next, when the voltage of the positive terminal becomes a third DC voltage value V3 that is smaller than the first DC voltage value V1, the constant voltage output unit outputs the first detection resistor or the first DC voltage value V3. 2 without directly passing through the detection resistor, and directly connecting to the positive terminal to output the first DC voltage value V1;
Power supply. The power supply device according to claim 1,
While the constant voltage output unit outputs the first DC voltage value V1 to the positive terminal via the first detection resistor, the voltage of the positive terminal is changed to the first DC voltage value V1. When the second DC voltage value V2 is smaller, the constant voltage output unit outputs the first DC voltage value V1 to the positive terminal via the second detection resistor,
When the voltage of the positive terminal becomes a third DC voltage value V3 that is smaller than the first DC voltage value V1 after the next predetermined time has elapsed, the constant voltage output unit is connected to the first detection resistor. Alternatively, the first direct-current voltage value V1 is output directly connected to the positive terminal without going through the second detection resistor.
Power supply. The power supply device according to claim 1 or 2,
The second DC voltage value V2 is equal to the third DC voltage value V3.
Power supply. The power supply device according to claim 1 or 2,
The second DC voltage value V2 and the third DC voltage value V3 are different.
Power supply. The power supply device according to any one of claims 1 to 4,
The first resistance value R1 is equal to the second resistance value R2.
Power supply. The power supply device according to any one of claims 1 to 4,
The first resistance value R1 and the second resistance value R2 are different.
Power supply. The power supply device according to claim 6,
The first resistance value R1 is greater than the second resistance value R2.
Power supply. The power supply device according to any one of claims 1 to 7,
The first resistance value R1 is equal to or greater than (the first DC voltage value V1 [V] / 5 [mA]).
Power supply. The power supply device according to any one of claims 1 to 8,
The first resistance value R1 is equal to or greater than (the first DC voltage value V1 [V] /0.5 [mA]).
Power supply. The power supply device according to any one of claims 1 to 9,
The first resistance value R1 is equal to or less than (the first DC voltage value V1 [V] /0.5 [μA]).
Power supply. The power supply device according to any one of claims 1 to 10,
The connection portion further includes a ground terminal,
The first DC voltage value V1 is based on the potential of the ground terminal,
The second DC voltage value V2 is based on the potential of the ground terminal,
The third DC voltage value V3 is based on the potential of the ground terminal.
Power supply. The power supply device according to any one of claims 1 to 11,
The constant voltage output unit receives a supply of power from an external power source and outputs a first DC voltage value V1.
Power supply. An electronic device capable of receiving power from an external power supply,
A connection portion having at least a ground terminal and a positive electrode terminal and connectable to the power supply device;
A load unit connectable to the positive electrode terminal and capable of consuming the power;
Both ends can be electrically connected to the positive terminal and the ground terminal, respectively, a first detection resistor having a first resistance value R1,
A second detection resistor having both ends electrically connectable to the positive terminal and the ground terminal and having a second resistance value R2,
While the positive terminal is not electrically connected to the load section and the positive terminal is electrically connected to the ground terminal via the first detection resistor, the voltage of the positive terminal However, when the second DC voltage value V2 is reached, the positive terminal is not electrically connected to the load section, and the positive terminal is electrically connected to the ground terminal via at least the second detection resistor. Connected to
Next, when the voltage of the positive terminal becomes the third DC voltage value V3, the positive terminal is electrically connected at least directly to the load unit.
Electronics. The electronic device according to claim 13,
The load unit has a secondary battery,
While the positive terminal is not electrically connected to the load section and the positive terminal is electrically connected to the ground terminal via the first detection resistor, the voltage of the positive terminal However, when the second DC voltage value V2 is reached, the positive terminal is not electrically connected to the load section, and the positive terminal is electrically connected to the ground terminal via at least the second detection resistor. Connected to
Next, when the voltage of the positive terminal becomes the third DC voltage value V3, the positive terminal is electrically connected at least directly to the load unit, and charging to the secondary battery is performed. Be started,
Electronics. The electronic device according to claim 13 or 14,
While the positive terminal is not electrically connected to the load section and the positive terminal is electrically connected to the ground terminal via the first detection resistor, the voltage of the positive terminal However, when the second DC voltage value V2 is reached, the positive terminal is not electrically connected to the load section, and the positive terminal is electrically connected to the ground terminal via at least the second detection resistor. Connected to
When the voltage of the positive electrode terminal becomes the third DC voltage value V3 after the next predetermined time has elapsed, the positive electrode terminal is directly electrically connected to at least the load unit.
Electronics. The electronic device according to any one of claims 13 and 14,
The second DC voltage value V2 is equal to the third DC voltage value V3.
Electronics. The electronic device according to any one of claims 13 and 14,
The second DC voltage value V2 and the third DC voltage value V3 are different.
Electronics. The electronic device according to any one of claims 13 to 17,
The first resistance value R1 is equal to the second resistance value R2.
Electronics. The electronic device according to any one of claims 13 to 17,
The first resistance value R1 and the second resistance value R2 are different.
Electronics. The electronic device according to claim 19,
The first resistance value R1 is smaller than the second resistance value R2.
Electronics. The electronic device according to any one of claims 13 to 20,
The second DC voltage value V2 is based on the potential of the ground terminal,
The third DC voltage value V3 is based on the potential of the ground terminal.
Electronics.   An electronic device system comprising the power supply device according to any one of claims 1 to 12 and the electronic device according to any one of claims 13 to 21.

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