JP2008099452A - Portable terminal device, abnormal operation detecting circuit, and power supply control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal device which can break the power supply from an external power source to an electronic circuit, when a fault occurs in the electronic circuit. <P>SOLUTION: This portable terminal device 1 can be supplied with power from an external AC power source 2. The device is equipped with the electronic circuit, detection circuits 111, 123, and 124 which detect the abnormal operation, in at least one place of the electronic circuit; a first switch 114 which short-circuits a part of a power transmission path that connects the external AC power source 2 with the electronic circuit; and a second control circuit 112 which so switches the first switch 114 as to open, when it detects abnormal operation by the detection circuits 111, 123, and 124. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable terminal device, an abnormal operation detection circuit, and a power supply control method for stopping power supply to an electronic circuit when an operation abnormality occurs in the electronic circuit provided in the apparatus.

  Among conventional mobile terminal devices, when an abnormal operation that occurs due to a short circuit or opening of a wiring or a failure of various parts constituting the circuit is detected in an electronic circuit mounted inside the mobile terminal device, There is a battery that interrupts the power supply from the secondary battery provided to the electronic circuit (for example, Patent Documents 1 and 2). FIG. 11 shows a functional block diagram of a conventional portable terminal device having a function of cutting off power supply from the secondary battery.

The electronic circuit mounted on the conventional portable terminal device 5 includes an AC power supply terminal 51, a battery power supply terminal 52, a battery current detection circuit 523, a temperature detection circuit 524, a control circuit 525, a switch 526, a secondary battery 53, a thermistor 54n ( n = 1, 2,... N). The electronic circuit is driven by the electric power Vbat supplied from the secondary battery 53 or the electric power Vac supplied from the external AC power source 6, and executes various functions provided in the portable terminal device. The battery current detection circuit 523 detects the current value Ibat at the battery power supply terminal 52 for supplying power from the secondary battery 53 to the electronic circuit, and in the period when the detected current value Ibat exceeds a certain threshold, Ibat DET indicating that the current is detected is output to the control circuit 525. The temperature detection circuit 524 is a part of an electronic circuit that is prone to failure or is a component that causes a serious problem to the mobile terminal device when a failure occurs (these components are used when a failure occurs) The temperature value VTHn is detected by the thermistor 54n arranged in the vicinity of the sensor, and a threshold value with any one of the detected temperature values VTHn is set. VTH DET indicating that the abnormal temperature is detected is output to the control circuit 525 during the exceeding period. The control circuit 525 determines that the portable terminal device has a failure during the period in which Ibat DET is input from the battery current detection circuit 523 or the period in which at least one of VTH DET is input from the temperature detection circuit 524. On the other hand, the control signal Vsw is output and switched so that it is determined that there is no failure in the mobile terminal device and the switch 526 is short-circuited during a period when neither is input.
Japanese Patent Application No. 9-248458 Japanese Patent Application No. 10-276792

  However, in the conventional mobile terminal device, when there is a failure in the mobile terminal device, the power supply from the secondary battery to the electronic circuit is cut off, but the power supply from the external AC power source to the electronic circuit is not cut off. For this reason, in the conventional portable terminal device, there is a possibility that malfunction or a new failure may occur in the electronic circuit when power is supplied from the external AC power source to the electronic circuit when the failure occurs.

  The present invention has been made in view of the above circumstances, and a portable terminal device, an abnormal operation detection circuit, and a power supply control capable of cutting off the power supply from an external power source to the electronic circuit when a failure occurs in the electronic circuit. It aims to provide a method.

  The portable terminal device of the present invention is a portable terminal device capable of supplying power from an external power source, and includes an electronic circuit, a detection unit that detects abnormal operation in at least one location of the electronic circuit, the external power source, and the A first switching unit that opens or short-circuits a part of the power transmission path that connects to the electronic circuit, and a switching control unit that switches the first switching unit to open when an abnormal operation is detected by the detection unit. Are provided.

  An abnormal operation detection circuit according to the present invention is an abnormal operation detection circuit that detects an abnormal operation occurring in an electronic circuit, the detection unit detecting an abnormal operation in at least one place of the electronic circuit, an external power supply, and the electronic circuit A first switching unit that opens or short-circuits a part of the power transmission path that connects to the switching unit, and a switching control unit that switches the first switching unit to open when an abnormal operation is detected by the detection unit; Is provided.

  The power supply control method of the present invention is a power supply control method by an abnormal operation detection circuit for detecting an abnormal operation occurring in an electronic circuit, wherein the abnormal operation is detected in at least one place of the electronic circuit, and the abnormal operation is detected. When an operation is detected, a part of the power transmission path connecting the external power source and the electronic circuit is opened.

  With this configuration, power supply from the external power source to the electronic circuit can be interrupted when a failure occurs in the electronic circuit.

  The portable terminal device according to the present invention includes a secondary battery that is charged by electric power supplied from an external power source, and a second part that opens or short-circuits a part of a power transmission path that connects the secondary battery and the electronic circuit. Switching unit, and the switching control unit switches to open the second switching unit when the detection unit detects an abnormal operation.

  In addition, the abnormal operation detection circuit of the present invention includes a second switching unit that opens or short-circuits a part of a power transmission path that connects a secondary battery that is charged by power supplied from an external power source and the electronic circuit. And the switching control unit switches to open the second switching unit when an abnormal operation is detected by the detection unit.

  In the power supply control method of the present invention, when the abnormal operation is detected, a part of the power transmission path that connects the secondary battery charged with the power supplied from the external power source and the electronic circuit is opened. , Including things.

  With this configuration, power supply from the external power source and the secondary battery to the electronic circuit can be interrupted when a failure occurs in the electronic circuit.

  The portable terminal device of the present invention includes a plurality of the detection units, and when the switching control unit detects an abnormal operation by at least one detection unit, at least the first switching unit and the second switching unit. Including one that switches one or both of the switching units to be opened.

  The abnormal operation detection circuit of the present invention includes a plurality of the detection units, and when the switching control unit detects an abnormal operation by at least one of the detection units, at least the first switching unit and the first switching unit. The one which switches so that one or both of 2 switching parts may be opened is included.

  The power supply control method of the present invention detects an abnormal operation at a plurality of locations of the electronic circuit, and detects an abnormal operation at at least one location to connect the external power source and the electronic circuit. And a part of the power transmission path that connects the electronic circuit to the secondary battery that is charged by the power supplied from the external power source and the electronic circuit.

  With this configuration, various abnormal operations that occur in the mobile terminal device can be detected by a plurality of detection units.

  Further, in the mobile terminal device of the present invention, when the switching control unit continues to detect abnormal operation for a predetermined period, the switching control unit is at least one of the first switching unit and the second switching unit, or Includes switching to open both.

  In the abnormal operation detection circuit of the present invention, when the switching control unit continues to detect abnormal operation for a predetermined period, at least one of the first switching unit and the second switching unit, Or include things that switch to open both.

  In addition, the power supply control method of the present invention is configured so that, when abnormal operation is continuously detected for a predetermined period, a part of a power transmission path that connects the external power supply and the electronic circuit, and power supplied from the external power supply. It includes one that switches to open one or both of a part of the power transmission path that connects the secondary battery to be charged and the electronic circuit.

  With this configuration, even when fluctuations occur in reference information (for example, a voltage value, a current value, or a temperature value) for determining the presence or absence of abnormal operation while supplying a drive voltage to an electronic circuit, the reference information Therefore, it can be accurately determined that a normal drive voltage is applied from the secondary battery 13 to the electronic circuit.

  The portable terminal device of the present invention further includes a power supply control unit that intermittently supplies power for performing a detection operation from the secondary battery to the detection unit, and the detection unit includes the power supply control unit. It includes those that detect abnormal operation during the period when power is supplied from.

  The abnormal operation detection circuit of the present invention further includes a power supply control unit that intermittently supplies power for performing a detection operation from the secondary battery to the detection unit, and the detection unit includes the power supply control. This includes detecting abnormal operation during a period when power is supplied from the unit.

  In the power supply control method of the present invention, the secondary battery intermittently supplies power for performing detection operation to the detection unit that detects abnormal operation occurring in the electronic circuit, and the power is supplied. During which the detection unit detects an abnormal operation.

  With this configuration, it is possible to reduce power consumption necessary for the detection unit to detect abnormal operation.

  Moreover, the mobile terminal device of the present invention includes a plurality of the detection units, and the power supply control unit includes two or more secondary batteries at any time from the secondary battery to each of the detection units. It includes one that is switched so as not to be supplied to the detection unit and is supplied intermittently.

  In addition, the abnormal operation detection circuit of the present invention includes a plurality of the detection units, and the power supply control unit includes two or more secondary batteries at any time from the secondary battery to each of the detection units. It is switched so as not to be supplied to the detection unit, and is supplied intermittently.

  In the power supply control method of the present invention, the plurality of detection units are intermittently supplied by switching from the secondary battery to the two or more detection units at an arbitrary time. Including things to do.

  With this configuration, the power supply control unit selectively inputs signals regarding the presence or absence of abnormal operation from a plurality of detection units, and the circuit scale of the power supply control unit is prepared in preparation for these signals being input simultaneously. There is no need to increase the size.

  The portable terminal device of the present invention includes a stabilized power source, and the stabilized power source outputs power input from the secondary battery to the detection unit as power for performing a detection operation. including.

  The abnormal operation detection circuit of the present invention includes a stabilized power supply, and the stabilized power supply outputs the power input from the secondary battery to the detection unit as power for performing a detection operation. Including things.

  In the power supply control method of the present invention, power is input from the secondary battery to a stabilized power supply, and the stabilized power supply causes a detection unit that detects an abnormal operation occurring in an electronic circuit to perform a detection operation. The thing which outputs the electric power of.

  With this configuration, by supplying a stable drive voltage to the detection unit, it is possible to prevent malfunction due to unstable operation of the detection unit.

  Moreover, the portable terminal device of this invention contains what is provided with the low-pass filter arrange | positioned between the said detection part and the location which should detect abnormal operation | movement by the said detection part.

  Moreover, the abnormal operation detection circuit of the present invention includes a circuit including a low-pass filter disposed between the detection unit and a portion where the detection unit should detect an abnormal operation.

  The power supply control method of the present invention includes a low-pass filter disposed between a detection unit that detects an abnormal operation occurring in an electronic circuit and a portion where the abnormal operation should be detected by the detection unit. Including.

  With this configuration, the noise component is removed from the voltage detected by the detection unit, and the presence or absence of an abnormal operation that may occur in the mobile terminal device can be accurately detected.

  Moreover, the portable terminal device of this invention contains what is provided with the memory | storage part which memorize | stores the classification of the abnormal operation detected by the said detection part.

  In addition, the abnormal operation detection circuit of the present invention includes a circuit including a storage unit that stores the type of abnormal operation detected by the detection unit.

  Further, the power supply control method of the present invention includes a method for storing the type of detected abnormal operation.

  With this configuration, when a failure occurs in the mobile terminal device, it becomes easy to specify the cause of the failure by reading information stored in the storage unit later.

  According to the portable terminal device, the abnormal operation detection circuit, and the power supply control method of the present invention, it is possible to cut off the power supply from the external power source to the electronic circuit when a failure occurs in the electronic circuit.

  Hereinafter, a mobile terminal device according to an embodiment of the present invention will be described. First, a basic configuration that is minimally necessary for carrying out the present invention will be described. FIG. 1 is a functional block diagram showing the basic configuration of the mobile terminal device according to the embodiment of the present invention.

  The electronic circuit mounted on the portable terminal device 1 according to the embodiment of the present invention includes an AC power supply terminal 11, an external AC voltage detection circuit 111, a first control circuit 112, an OR circuit 113, a first switch 114, and a battery power supply terminal 12. , A battery current detection circuit 123, a temperature detection circuit 124, a second control circuit 125, a second switch 126, a secondary battery 13, and a thermistor 14n (n = 1, 2,... N). In FIG. 1, the power line inside the mobile terminal device is indicated by a thick line, and the signal line is indicated by a line thinner than the power line.

  The electronic circuit is supplied from the secondary battery 13 via the battery power supply terminal 12 (terminal for transmitting the power supplied from the secondary battery 13 to the electronic circuit) or from the external AC power supply 2 to the AC power supply terminal 11 ( It is driven by power Vac supplied via a terminal (which transmits power supplied from the external AC power source 2 to the electronic circuit), and executes various functions provided in the mobile terminal device. The battery current detection circuit 123 detects a current value Ibat for supplying power from the secondary battery 13 to the electronic circuit, and detects an abnormal current in a period in which the detected current value Ibat exceeds a certain threshold value. Is output to the second control circuit 125. The temperature detection circuit 124 is a part of an electronic circuit that is prone to failure or is a component that causes a serious problem in the mobile terminal device when a failure occurs (these components are used when a failure occurs). The temperature value VTHn is detected by the thermistor 14n arranged in the periphery of the thermistor 14n, and is input from the plurality of thermistors 14n via the OR circuit. During a period when any of the values VTHn exceeds a certain threshold, VTH DET indicating that an abnormal temperature has been detected is output to the second control circuit 125. The second control circuit 125 determines that the mobile terminal device has a failure during a period in which Ibat DET is input from the battery current detection circuit 123 via the OR circuit or a period in which VTH DET is input from the temperature detection circuit 124. On the other hand, in the period when none of the control signals Vsw2 for determining and opening the second switch 126 is input via the OR circuit, it is determined that there is no failure in the portable terminal device and the second switch 126 is short-circuited. The signal Vsw2 is output to the second switch 126 for switching. Further, the second control circuit 125 outputs a control signal Vsw2 for opening or short-circuiting the second switch 126 to the second switch 126 and outputs a similar control signal Vsw2 to the OR circuit 113.

  Further, the external AC voltage detection circuit 111 detects a voltage value Vac for supplying electric power from the external AC power source 2 to the electronic circuit, and the detected voltage value Vac is within a predetermined numerical range. Vac DET indicating that the power from the external AC power supply 2 is normal is output to the first control circuit 112. The first control circuit 112 outputs to the OR circuit 113 a control signal Vac DETO indicating that “the mobile terminal device has no failure” during the period when the Vac DET is input from the external AC voltage detection circuit 111. On the other hand, the first control circuit 112 outputs, to the OR circuit 113, a control signal Vac DETO indicating that “the mobile terminal device has a failure” during a period when the Vac DET is not input from the external AC voltage detection circuit 111. To do. The OR circuit 113 receives the Vac DETO indicating that the mobile terminal device has no failure from the first control circuit 112, and the control signal Vsw2 indicating that the mobile terminal device has no failure from the second control circuit 125. Is input, a control signal Vsw1 for short-circuiting the first switch 114 is output to short-circuit the first switch 114, while Vac DETO indicating that “the mobile terminal device has a failure”, from the first control circuit 112, When one or both of the control signals Vsw2 indicating that “the mobile terminal device has a failure” are input from the second control circuit 125, the control signal Vsw1 that opens the first switch 114 is output to output the first switch 114 is opened.

  As described above, according to the mobile terminal device of the embodiment of the present invention, when the mobile terminal device has a failure, power is supplied from the secondary battery to the electronic circuit along with the power supply from the secondary battery to the electronic circuit. Therefore, it is possible to prevent a malfunction caused by power being supplied from the external power source to the electronic circuit where the failure has occurred, or a new failure that may occur in the electronic circuit. In the embodiment described below, a switching process of the first switch 114 and the second switch 126 and a process of detecting a failure occurring in the mobile terminal apparatus by the mobile terminal apparatus according to the embodiment of the present invention will be described in detail. .

(First embodiment)
Hereinafter, the portable terminal device according to the first embodiment of the present invention will be described in detail. In FIG. 2, the functional block diagram in the portable terminal device of 1st Embodiment of this invention is shown. In the configuration of the mobile terminal device shown in FIG. 1, the external AC voltage detection circuit 111, the battery current detection circuit 123, and the temperature detection circuit 124 have been described as circuits for determining whether or not the mobile terminal device has failed. In the first embodiment, a mobile terminal device capable of detecting a failure of the mobile terminal device in a composite manner by configuring a plurality of detection circuits, which are obtained by adding a battery voltage detection circuit 122 to these detection circuits, as a single module. Will be described. A determination process that can improve the accuracy of determining whether or not a mobile terminal device has failed will also be described.

  This module is referred to as an abnormal operation detection module. In FIG. 2, a region surrounded by a dotted line including a plurality of detection circuits, the first control circuit 112, the second control circuit 125, and the OR circuit 113 is abnormal operation. It corresponds to a detection module. Further, in FIG. 2, an object to which the same reference numeral as the reference numeral described in FIG. 1 is assigned is as described for the same object in the functional block diagram of FIG. In FIG. 2, the OR circuit in the temperature detection circuit 124 and the second control circuit 125 is omitted. However, VTH from a plurality of thermistors is input to the OR circuit in the temperature detection circuit 124, and the second control is performed. The configuration in which signals from a plurality of detection circuits are input to the OR circuit of the circuit 125 is common to the temperature detection circuit 124 and the second control circuit 125 in FIG.

  First, the process for determining whether or not the mobile terminal device has failed by the reset circuit 121a and the reset coincidence circuit 121b will be described. In FIG. 3, the outline | summary of the determination process at the time of the application start by the secondary battery 13 by the portable terminal device of 1st Embodiment of this invention is shown. The reset circuit 121a detects a voltage value Vbat for supplying power from the secondary battery 13 to the electronic circuit when the electronic circuit is activated, and the detected voltage value Vbat is a secondary battery voltage threshold value (Vbat in FIG. 3). VRST indicating that the power from the secondary battery 13 is normal is output to the reset coincidence circuit 121b above the secondary battery voltage threshold required to drive the electronic circuit stably from the voltage fluctuation at the time of connection. To do. The reset circuit 121a outputs a voltage recognized as “High” to the reset coincidence circuit 121b as VRST when the voltage is equal to or higher than the secondary battery voltage threshold, and “Low” when the voltage is lower than the secondary battery voltage threshold. Is recognized as VRST and output to the reset coincidence circuit 121b.

  When the VRST recognized as “High” is input from the reset circuit 121a (at times t1 and t2 in FIG. 3), the reset coincidence circuit 121b starts timing by a timer (not shown). The reset coincidence circuit 121b starts measuring time by the timer, and then the period during which VRST recognized as “High” is input from the reset circuit 121a is a predetermined time (period indicated by tERON from t2 to t3 in FIG. 3). ), The voltage recognized as “High” is output as VER ON to the battery voltage detection circuit 122a, the battery current detection circuit 123a, and the temperature detection circuit 124a. On the other hand, the reset coincidence circuit 121b starts timing by the timer, and after the period when the VRST recognized as “High” is input from the reset circuit 121a does not reach a predetermined time (from t1 to t2 in FIG. 3). The voltage recognized as “Low” is output as VER ON to the battery voltage detection circuit 122a, the battery current detection circuit 123a, and the temperature detection circuit 124a. Note that tERON is preferably set longer than the time required for the voltage supplied from the secondary battery 13 to converge to a constant value.

  If the battery voltage detection circuit 122a, the battery current detection circuit 123a, and the temperature detection circuit 124a that have input VER ON recognize the VER ON input from the reset coincidence circuit 121b as “High”, each circuit detects an abnormality in the portable terminal device. On the other hand, during the period when the VER ON input from the reset coincidence circuit 121b is recognized as “Low”, the abnormality detection processing in the mobile terminal device by each circuit is not performed and the “VER ON” of “High” is Wait for input.

  At the start of application from the secondary battery 13 to the electronic circuit, as shown in FIG. 3, a fluctuation occurs in which the applied voltage irregularly rises to a specified value. If the abnormality detection operation by the abnormal operation detection module is executed in a state where such a fluctuation has occurred, the operation of the abnormal operation detection module may not be stable and a malfunction may occur in the detection of the abnormal operation. In addition, it is assumed that the detected Vbat cannot maintain the secondary battery voltage threshold or higher, and a voltage (voltage fluctuation) at which “High” and “Low” are switched in a short time is output as VRST from the reset circuit 121a. It should also be considered to prevent this. According to the reset circuit 121a and the reset coincidence circuit 121b in the mobile terminal device of the first embodiment of the present invention, the voltage value Vbat detected by the reset circuit 121a fluctuates at the start of supplying the drive voltage from the secondary battery to the electronic circuit. Therefore, the abnormal operation detection module does not execute the abnormal operation detection process during a period when there is a possibility that power cannot be stably supplied to the abnormal operation detection module. In addition, it is possible to prevent excessive power supply that can be applied from the secondary battery 13 in which a failure has occurred to the abnormal operation detection module.

  In addition, it is preferable to perform the process by the reset circuit 121a and the reset coincidence circuit 121b every time the secondary battery is detached.

  Next, a process for determining whether or not the mobile terminal device has failed by the battery voltage detection circuit 122a and the battery voltage matching circuit 122b will be described. FIG. 4 shows an outline of the applied voltage determination process performed by the mobile terminal device according to the first embodiment of the present invention. When the battery voltage detection circuit 122a inputs VER ON recognized as “High” from the reset coincidence circuit 121b, the battery voltage detection circuit 122a starts an abnormality detection process, and when VER ON recognized as “Low” is inputted from the reset coincidence circuit 121b, The abnormality detection process ends.

  The battery voltage detection circuit 122a detects a voltage value Vbat for supplying power from the secondary battery 13 to the electronic circuit, and the detected voltage value Vbat has a certain threshold value (the presence or absence of failure of the mobile terminal device in FIG. 4). In a period exceeding the abnormal secondary battery voltage threshold for determination), Vbat DET indicating that the power from the secondary battery 13 is abnormal is output to the battery voltage matching circuit 122b. The battery voltage detection circuit 122a outputs the voltage recognized as “High” to the battery voltage matching circuit 122b as Vbat DET during the period determined to be large, and “Low” during the period determined as small. The recognized voltage is output as Vbat DET to the battery voltage matching circuit 122b.

  When the battery voltage detection circuit 122b receives Vbat DET recognized as “High” from the battery voltage detection circuit 122a (at times t1, t2, t3, t4, and t5 in FIG. 4), a timer (not shown) To start timing. The battery voltage matching circuit 122b starts measuring time by the timer, and then the period during which Vbat DET recognized as “High” is input from the battery voltage detection circuit 122a is a predetermined time (from t4 to t5 in FIG. 4). In the period indicated by tVbatDET), a voltage recognized as “High” is output to the second control circuit 125 as Vbat DETO. On the other hand, after the battery voltage matching circuit 122b starts timing by the timer, the period during which Vbat DET recognized as “High” is input from the battery voltage detection circuit 122a does not reach a predetermined time (in FIG. 4). , T1, t2 or t3 until the input of Vbat DET recognized as “Low” is less than the predetermined time described above), and the voltage recognized as “Low” is set as Vbat DETO. Output to the circuit 125. When the second control circuit 125 receives Vbat DETO recognized as “High” from the battery voltage matching circuit 122b, the second control circuit 125 outputs Vsw2 recognized as “High” from the second control circuit 125 and opens the second switch 126. Then, the power supply from the secondary battery 13 to the electronic circuit is stopped. Further, by outputting Vsw2 recognized as “High” from the second control circuit 125 to the OR circuit 113, the OR circuit 113 outputs Vsw1 recognized as “High” and opens the first switch 114, The power supply from the external AC power source 2 to the electronic circuit is also stopped.

  When a voltage is applied from the secondary battery 13 to the electronic circuit, as shown in FIG. 4, “fluctuation” in which the applied voltage fluctuates irregularly occurs. When such fluctuation occurs, it is assumed that the detected Vbat fluctuates across the abnormal secondary battery voltage threshold value, and is supplied from the secondary battery from such a voltage value Vbat that fluctuates in a short period of time. It is difficult to determine whether the voltage is normal or abnormal. Further, the battery voltage detection circuit 122a outputs a voltage (voltage fluctuation) at which “High” and “Low” are switched in a short period of time as Vbat DET, and it is necessary to prevent this. According to the battery voltage detection circuit 122a and the battery voltage matching circuit 122b in the portable terminal device of the first embodiment of the present invention, the voltage detected by the battery voltage detection circuit 122a while supplying the drive voltage from the secondary battery to the electronic circuit. During a period when the value Vbat may exceed the abnormal secondary battery voltage threshold due to fluctuation, it can be accurately determined that a normal drive voltage is applied from the secondary battery 13 to the electronic circuit.

  After the battery voltage matching circuit 122b determines that the voltage supplied from the secondary battery 13 is abnormal at time t5 in FIG. 4, “High” is output from the second control circuit 125 to Vsw2, and the second Since the switch 126 is opened, the potential Vbat of the battery power supply terminal 12 becomes a low potential. On the other hand, the battery voltage detection circuit 122a continues to determine the Vbat voltage, and continues to output “High” of Vsw2 by the battery matching circuit 122b and the second control circuit 125 (High latch operation). Will remain open. Further, the OR circuit 113 to which Vsw2 “High” is input from the second control circuit 125 outputs Vsw1 “High” and opens the first switch 114, so that the potential Vaco of the AC power supply terminal 12 becomes the Low potential. In addition, when “LOW” VER ON is input again from the reset coincidence circuit 121b that has detected a drop in the voltage of Vbat (desorption of Vbat), the battery voltage coincidence circuit 122b sets the voltage recognized as “Low” to Vbat DETO. Is output to the second control circuit 125. Thereafter, the second control circuit 125 that has input Vbat DETO recognized as “Low” short-circuits the first switch 114 and the second switch 126.

  Next, the process for determining whether or not the mobile terminal device has failed by the battery current detection circuit 123a and the battery current matching circuit 123b will be described. FIG. 5 shows an outline of applied current determination processing by the mobile terminal device according to the first embodiment of the present invention. When the battery current detection circuit 123a inputs VER ON recognized as “High” from the reset coincidence circuit 121b, the battery current detection circuit 123a starts an abnormality detection process, and when VER ON recognized as “Low” is inputted from the reset coincidence circuit 121b, The abnormality detection process ends.

  The battery current detection circuit 123a detects the voltage values Vbat and VbatI at both ends of the resistor 123c provided in the battery wiring for supplying power from the secondary battery 13 to the electronic circuit, and the detected voltage values Vbat and VbatI. In a period in which the current value Ibat calculated from the difference and the resistance 123c exceeds a certain threshold value (abnormal secondary battery current threshold value for determining the presence / absence of failure of the mobile terminal device in FIG. 5), from the secondary battery 13 Ibat DET indicating that the power of the battery is abnormal is output to the battery current matching circuit 123b. The battery current detection circuit 123a outputs a voltage recognized as “High” to the battery current matching circuit 123b as Ibat DET during the period determined to be large, while “Low” during the period determined as small. The recognized voltage is output to the battery current matching circuit 123b as Ibat DET. The abnormal secondary battery current threshold can be set to an arbitrary value by changing the value of the resistor 123c, and an abnormal secondary battery current threshold setting resistor (not shown) provided in the battery current detection circuit 123a. ) Can be arbitrarily set.

  When the battery current matching circuit 123b receives Ibat DET recognized as “High” from the battery current detection circuit 123a (at times t1, t2, t3, t4, and t5 in FIG. 5), the timer (not shown) To start timing. The battery current matching circuit 123b starts measuring time by the timer, and then the Ibat DET recognized as “High” is input from the battery current detection circuit 123a for a predetermined time (from t4 to t5 in FIG. 5). In the period indicated by tIbat DET), a voltage recognized as “High” is output to the second control circuit 125 as Ibat DETO. On the other hand, after the battery current matching circuit 123b starts measuring time by the timer, the period during which Ibat DET recognized as “High” is input from the battery current detection circuit 123a does not reach a predetermined time (in FIG. 5). , T1, t2 or t3 until the input of Ibat DET recognized as “Low” is less than the predetermined time described above), and the second control uses the voltage recognized as “Low” as Ibat DETO. Output to the circuit 125. When the second control circuit 125 receives Ibat DETO recognized as “High” from the battery current matching circuit 123b, the second control circuit 125 opens the second switch 126 and stops the power supply to the electronic circuit. Also, by outputting Vsw2 recognized as “High” from the second control circuit 125, Vsw1 recognized as “High” is output from the OR 113, and the first switch 114 is opened, and the electronic power is supplied from the external AC power source 2 The power supply to the circuit is also stopped.

  When a voltage is applied from the secondary battery 13 to the electronic circuit, as shown in FIG. 5, “fluctuation” in which the applied current fluctuates irregularly occurs. When such fluctuations occur, it is assumed that the detected Ibat fluctuates across the abnormal secondary battery current threshold, and is supplied from the secondary battery from the current value Ibat that fluctuates in such a short time. It is difficult to determine whether the voltage is normal or abnormal. Further, the battery current detection circuit 123a outputs a voltage (voltage fluctuation) at which “High” and “Low” are switched in a short time as Ibat DET, and it is necessary to prevent this. According to the battery current detection circuit 123a and the battery current matching circuit 123b in the mobile terminal device of the first embodiment of the present invention, the current detected by the battery current detection circuit 123a while supplying the drive voltage from the secondary battery to the electronic circuit. In a period in which the value Ibat may exceed the abnormal secondary battery current threshold due to fluctuation, it can be accurately determined that a normal drive voltage is applied from the secondary battery 13 to the electronic circuit.

  After the battery current matching circuit 123b determines that the current supplied from the secondary battery 13 is abnormal at time t5 in FIG. 5, the second switch 126 is opened, so that Ibat is almost zero. Ibat DET becomes “Low”. On the other hand, the battery current matching circuit 123b and the second control circuit 125 continuously output “High” as Vsw2, opens the second switch 126, and stops the power supply to the electronic circuit. Further, by outputting Vsw2 recognized as “High” from the second control circuit 125 to the OR circuit 113, the OR circuit 113 outputs Vsw1 recognized as “High” and opens the first switch 114, The power supply from the external AC power source 2 to the electronic circuit is also stopped. Further, when the LOW ON of “Low” is inputted again from the reset coincidence circuit 121b detecting the Vbat, the battery current coincidence circuit 123b changes the voltage recognized as “Low” to the Vbat. This is output to the second control circuit 125 as DETO. Thereafter, the second control circuit 125 that has input Vbat DETO recognized as “Low” short-circuits the first switch 114 and the second switch 126.

  Next, a process for determining whether or not the mobile terminal device has failed by the temperature detection circuit 124a and the temperature matching circuit 124b will be described. FIG. 6 shows an outline of determination processing by the thermistor by the mobile terminal device according to the first embodiment of the present invention. When the temperature detection circuit 124a receives VER ON recognized as “High” from the reset coincidence circuit 121b, the temperature detection circuit 124a starts the abnormality detection process. When the temperature detection circuit 124a inputs VER ON recognized as “Low” from the reset coincidence circuit 121b, The detection process ends.

  The temperature detection circuit 124a includes a temperature value VTHn by a thermistor 14n that is part of an electronic circuit and is disposed around a component that is likely to fail or a component that causes a serious problem in the mobile terminal device when a failure occurs. And detected an abnormal temperature during a period in which any one of the detected temperature values VTHn exceeds a certain threshold value (abnormal temperature threshold value for determining the presence or absence of failure of the mobile terminal device in FIG. 6). VTH DET indicating this is output to the temperature matching circuit 124b. The temperature detection circuit 124a outputs the voltage recognized as “High” to the temperature matching circuit 124b as VTH DET during the period determined to be large, while it is recognized as “Low” during the period determined to be small. Is output to the temperature matching circuit 124b as VTH DET. The abnormal temperature threshold can be arbitrarily set by appropriately changing the temperature resistance change characteristic of the thermistor provided and the resistance value (not shown) at room temperature, and the abnormal temperature threshold is provided in the temperature detection circuit 124a. It can be arbitrarily set by changing a temperature threshold setting resistor (not shown).

  When the VTH DET recognized as “High” is input from the temperature detection circuit 124a (at times t1, t2, t3, t4, and t5 in FIG. 6), the temperature matching circuit 124b receives a timer (not shown). To start timing. The temperature matching circuit 124b starts measuring time by the timer, and then the period during which the VTH DET recognized as “High” is input from the temperature detection circuit 124a is a predetermined time (tVTH DET from t4 to t5 in FIG. 6). ), A voltage recognized as “High” is output to the second control circuit 125 as VTH DETO. On the other hand, the temperature coincidence circuit 124b starts timing by the timer, and after the period when the VTH DET recognized as “High” is input from the temperature detection circuit 124a does not reach a predetermined time (t1 in FIG. 6). , T2 or t3 until the input of VTH DET recognized as “Low” is less than the predetermined time described above), and the second control circuit 125 uses the voltage recognized as “Low” as VTH DETO. Output to. When VTH DETO recognized as “High” is input from the temperature matching circuit 124b, the second control circuit 125 sets Vsw2 to “High” (the second control circuit 125 and the temperature matching circuit 124b perform a high latch operation). 2 The switch 126 is opened and the power supply to the electronic circuit is stopped. Further, by outputting Vsw2 recognized as “High” from the second control circuit 125 to the OR circuit 113, the OR circuit 113 outputs Vsw1 recognized as “High” and opens the first switch 114, The power supply from the external AC power source 2 to the electronic circuit is also stopped.

  When a voltage is applied from the secondary battery 13 to the electronic circuit, as shown in FIG. 6, “fluctuation” in which the temperature detected by the thermistor arranged in the electronic circuit fluctuates irregularly occurs. When such fluctuation occurs, it is assumed that the detected temperature value VTH fluctuates across the abnormal temperature threshold, and the presence or absence of abnormality in the electronic circuit is determined from the temperature value VTH that fluctuates in such a short period of time. It is difficult to do. Further, the voltage (voltage fluctuation) at which “High” and “Low” are switched in a short time is output as VTH DET from the temperature detection circuit 124a, and it is necessary to prevent this. According to the temperature detection circuit 124a and the temperature coincidence circuit 124b in the portable terminal device of the first embodiment of the present invention, the temperature value VTH detected by the temperature detection circuit 124a is being supplied while the drive voltage is being supplied from the secondary battery to the electronic circuit. During a period when the abnormal temperature threshold may be exceeded due to fluctuation, it can be accurately determined that a normal drive voltage is applied from the secondary battery 13 to the electronic circuit.

  After the temperature matching circuit 124b determines that there is an abnormality in the electronic circuit at time t5 in FIG. 6, since the second switch 126 is opened, there is no heat source generated in the electronic circuit, so VTH is It converges to the outside temperature and VTH DET becomes “Low”. On the other hand, the temperature matching circuit 124b continues to output the voltage recognized as “High” to the second control circuit 125 as VTH DETO during the period when the second switch 126 is opened and the power supply to the electronic circuit is stopped. The second switch 126 continues to open. Further, by outputting Vsw2 recognized as “High” from the second control circuit 125 to the OR circuit 113, the OR circuit 113 outputs Vsw1 recognized as “High” and opens the first switch 114, The power supply from the external AC power source 2 to the electronic circuit is also stopped. Further, when the LOW ON of “Low” is inputted again from the reset coincidence circuit 121b that detects the Vbat voltage drop (Vbat desorption) Vbat, the temperature coincidence circuit 124b changes the voltage recognized as “Low” to Vbat DETO. Is output to the second control circuit 125. Thereafter, the second control circuit 125 that has input Vbat DETO recognized as “Low” short-circuits the first switch 114 and the second switch 126.

  Next, switching processing of short-circuit opening of the second switch 126 by the second control circuit 125 that receives signals from the battery voltage matching circuit 122b, the battery current matching circuit 123b, and the temperature matching circuit 124b will be described. The second control circuit 125 includes at least Vbat DETO recognized as “High” from the battery voltage matching circuit 122b, Ibat DETO recognized as “High” from the battery current matching circuit 123b, and “High” from the temperature matching circuit 124b. During the period when any one of the VTH DETO recognized as “” is input, it is determined that there is a failure in the mobile terminal device, and the control signal Vsw2 for opening the second switch 126 is output to the second switch 126. (When the second switch 126 is opened, the second control circuit 125 outputs a voltage recognized as “High” as the control signal Vsw2). On the other hand, the second control circuit 125 determines that there is no failure in the mobile terminal device during a period in which signals that are recognized as “Low” are input, and the control signal Vsw2 that short-circuits the second switch 126. Is output to the second switch 126 (the second control circuit 125 outputs a voltage recognized as “Low” as the control signal Vsw2 when the second switch 126 is short-circuited). By the switching process of the second switch 126 by the second control circuit 125, a failure of the mobile terminal device can be detected in a composite manner. Further, the second control circuit 125 outputs a control signal Vsw2 for opening or short-circuiting the second switch 126 to the second switch 126 and outputs a similar control signal Vsw2 to the OR circuit 113.

  Further, the second control circuit 125 receives Vbat DETO recognized as “High” from the battery voltage matching circuit 122b, Ibat DETO recognized as “High” from the battery current matching circuit 123b, or “High” from the temperature matching circuit 124b. When the VTH DETO recognized as “” is input, information for identifying the circuits 122b, 123b, and 124b that are output destinations is stored in a memory (not shown) provided in the second control circuit 125. With this configuration, when a failure occurs in the mobile terminal device, it becomes easy to specify the cause of the failure by reading information stored in the memory later.

  Next, a process for determining whether or not the mobile terminal device has a failure by the external AC voltage detection circuit 111 will be described. FIG. 7 shows an outline of determination processing at the time of application by the external AC power supply 2 by the mobile terminal device according to the first embodiment of the present invention. FIG. 7A shows an outline of processing by the external AC voltage detection circuit 111 and the first control circuit 112 when a normal voltage Vac is applied from the external AC power supply 2 to the electronic circuit. These respectively show outlines of processing by the external AC voltage detection circuit 111 and the first control circuit 112 when an abnormal voltage Vac is applied from the external AC power supply 2 to the electronic circuit.

  With reference to FIG. 7A, processing by the external AC voltage detection circuit 111 and the first control circuit 112 when a normal voltage Vac is applied from the external AC power supply 2 to the electronic circuit will be described. The external AC voltage detection circuit 111 detects a voltage value Vac for supplying power from the external AC power supply 2 to the electronic circuit, and during the period in which the detected voltage value Vac is within a predetermined numerical range, the external AC power supply 2 Vac DET indicating that the power from is normal is output to the first control circuit 112. More specifically, the external AC voltage detection circuit 111 has two threshold values (an external AC voltage threshold value for determining that the voltage is applied from the outside in FIG. 7, and a numerical value larger than the external AC voltage threshold value. It is determined whether or not the detected voltage value Vac is included in the numerical range specified by the abnormal external voltage threshold value for determining whether or not there is a failure. During the period when the external AC voltage detection circuit 111 is determined to be included (after the external AC voltage detection point in FIG. 7A), the voltage recognized as “High” is set to Vac DET as the first control circuit. On the other hand, during the period determined to be not included (before the external AC voltage detection point in FIG. 7A), the first control circuit 112 uses the voltage recognized as “Low” as Vac DET. Output to.

  The first control circuit 112 receives a Vac DET recognized as “High” from the external AC voltage detection circuit 111 (at the time of the external AC voltage detection point in FIG. 7A), and starts a timer (not shown). ) To start timing. The first control circuit 112 starts measuring time by a timer and then receives a Vac DET recognized as “High” from the external AC voltage detection circuit 111 for a predetermined time (a period indicated by tVac DET in FIG. 7). ), The voltage recognized as “High” is output to the OR circuit 113 as Vac DETO. The OR circuit 113 that inputs “Low” as a result of inverting “High” from the first control circuit 112 outputs Vsw1 “Low”, shorts the first switch, and supplies the voltage Vaco to the AC power supply terminal 11. To do. On the other hand, the first control circuit 112 starts measuring time by the timer, and then the period during which Vac DET recognized as “High” is input from the external AC voltage detection circuit 111 is a predetermined time (tVac DET in FIG. 7). If it is less than the period shown, a voltage recognized as “Low” is output to the OR circuit 113 as Vac DETO. The OR circuit 113 that inputs “High” as a result of inverting “Low” from the first control circuit 112 outputs Vsw1 “High”, opens the first switch, and does not supply power to the AC power supply terminal 11. .

  Next, processing performed by the external AC voltage detection circuit 111 and the first control circuit 112 when an abnormal voltage Vac is applied from the external AC power supply 2 to the electronic circuit will be described with reference to FIG. . The external AC voltage detection circuit 111 detects a voltage value Vac for supplying power from the external AC power source 2 to the electronic circuit, and uses two threshold values (external AC for determining that the voltage is applied from the outside in FIG. 7). Whether or not the detected voltage value Vac is included in a numerical range that is greater than the voltage threshold value and the external AC voltage threshold value and is specified by an abnormal external voltage threshold value for determining whether or not the mobile terminal device has failed. Determine whether. The external AC voltage detection circuit 111 determines the voltage recognized as “High” during the period determined to be included (in FIG. 7B, after the external AC voltage detection point and before the abnormal external AC voltage detection point). While being output to the first control circuit 112 as Vac DET, while being determined not to be included (before the external AC voltage detection point and after the abnormal external AC voltage detection point in FIG. 7B), “Low ”Is output to the first control circuit 112 as Vac DET.

  The first control circuit 112 receives a Vac DET recognized as “High” from the external AC voltage detection circuit 111 (at the time of the external AC voltage detection point in FIG. 7B), and starts a timer (not shown). ) To start timing. The first control circuit 112 starts measuring time by a timer and then receives a Vac DET recognized as “High” from the external AC voltage detection circuit 111 for a predetermined time (a period indicated by tVac DET in FIG. 7). Therefore, the voltage recognized as “Low” is output as “Low” to the OR circuit 113 as Vac DETO. The OR circuit 113 that inputs “High” as a result of inverting “Low” from the first control circuit 112 outputs Vsw1 “High”, opens the first switch, and does not supply power to the AC power supply terminal 11. .

  If the voltage applied to the electronic circuit from the external AC power source 2 is normally applied, a numerical value between the external AC voltage threshold and the abnormal external AC voltage threshold with the passage of time as shown in FIG. However, if an abnormal voltage is applied, the voltage rises to a value exceeding the abnormal external AC voltage threshold as shown in FIG. According to the external AC voltage detection circuit 111 and the first control circuit 112 in the mobile terminal device according to the first embodiment of the present invention, the external AC voltage threshold increases from the external AC voltage threshold when an abnormal voltage is applied to the abnormal external AC voltage threshold. In the period up to, i.e., a numerical value between the external AC voltage threshold and the abnormal external AC voltage threshold, but an abnormal voltage may be applied, the external AC power supply 2 applies the electronic circuit. Therefore, it is possible to prevent an abnormal voltage from being applied to the electronic circuit.

  The OR circuit 113 receives the signal Vac DETO recognized as “Low” as a result of the inversion from the first control circuit 112 and the signal Vsw2 recognized as “Low” from the second control circuit 125, and then receives the first switch 114. A control signal Vsw1 “Low” is output to short-circuit the first switch 114, and power is supplied from the external AC power supply 2 to the electronic circuit. On the other hand, the OR circuit 113 receives at least one of the signal Vac DETO recognized as “High” as a result of inversion from the first control circuit 112 and the signal Vsw2 recognized as “High” from the second control circuit 125. The control signal Vsw1 “High” for opening the first switch 114 is output to open the first switch 114, and no power is supplied from the external AC voltage 2 to the electronic circuit.

  As described above, according to the mobile terminal device of the first embodiment of the present invention, when the mobile terminal device has a failure, not only the power supply from the secondary battery to the electronic circuit but also the power supply from the external AC power source to the electronic circuit is performed. Further, since the power is cut off, it is possible to prevent a malfunction caused by power being supplied from the external power source to the electronic circuit where the failure has occurred, or a new failure that may occur in the electronic circuit.

  In addition, according to the mobile terminal device of the first embodiment of the present invention, it is possible to detect a failure of the mobile terminal device in combination by a plurality of detection circuits having different detection processes for abnormal operations occurring in the mobile terminal device. . No conventional mobile terminal device is equipped with an abnormal operation detection module specialized in detecting an abnormal operation like the mobile terminal device according to the first embodiment of the present invention. The detection circuit that detects abnormal operation is usually provided as a circuit of the secondary battery. The portable terminal device according to the first embodiment of the present invention has versatility that can cope with various operational abnormalities by modularizing a plurality of detection circuits. In addition, the mobile terminal device according to the first embodiment of the present invention determines that the operation abnormality has occurred in the mobile terminal device when the operation abnormality is continuously detected for a predetermined time. It is possible to prevent the mobile terminal device from being erroneously determined to have malfunctioned by a signal that is a detection target including, and as a result, it is possible to improve the accuracy of determining the presence or absence of a failure of the mobile terminal device.

(Second Embodiment)
Hereinafter, the mobile terminal device according to the second embodiment of the present invention will be described in detail. In FIG. 8, the functional block diagram in the portable terminal device of 2nd Embodiment of this invention is shown. In the configuration of the portable terminal device according to the first embodiment of the present invention shown in FIG. 2, the driving power is always supplied from the secondary battery 13 to the battery voltage detection circuit 122a, the battery current detection circuit 123a, and the temperature detection circuit 124a. It was a configuration. In the portable terminal device of the second embodiment of the present invention, an oscillator 127 and a sampling control circuit 128 are newly added as configurations, and the oscillator 127 and the sampling control circuit 128 are changed from a secondary battery to a battery voltage detection circuit 122a, a battery current. The driving power supplied to the detection circuit 123a and the temperature detection circuit 124a is controlled. Hereinafter, the processing by the oscillator 127 and the sampling control circuit 128 will be mainly described with reference to the diagram showing the power supply timing to the detection circuit in the portable terminal device of the second embodiment of the present invention shown in FIG. Note that in FIG. 8, the objects assigned the same reference numerals as those shown in FIG. 2 are the same as those described in the functional block diagram of FIG. 2, and thus the description may be omitted.

  When the second switch 126 is short-circuited and power supply from the secondary battery 13 to the electronic circuit is started, the oscillator 127 supplied with power from the secondary battery 13 simultaneously oscillates and outputs at a predetermined frequency (oscillation from the oscillator 127). The output signal is hereinafter referred to as Fosc). The oscillator 127 oscillates and outputs to the sampling control circuit 128 every time the second switch 126 is short-circuited.

  After that, when the reset circuit 121a outputs VRST to the reset coincidence circuit 121b and the reset coincidence circuit 121b outputs VER ON to the sampling control circuit 128, the sampling control circuit 128 that has input VER ON inputs from the reset coincidence circuit 121b. If VER ON is recognized as “High”, power supply to each detection circuit is started in order to perform abnormality detection processing in the mobile terminal device by each detection circuit (abnormality detection processing execution period), while the reset coincidence circuit 121b. During the period in which the VER ON input from is recognized as “Low”, power is not supplied to each detection circuit, and the system waits until the “VER ON” of “High” is input (abnormality detection processing stop period).

  The power supply process to each detection circuit by the sampling control circuit 128 will be described. The sampling control circuit 128 intermittently supplies power to each detection circuit. In FIG. 9, the battery voltage detection circuit 122a is supplied with power for a period of tVat with a period of tVbatL (Sp1), and the battery current detection circuit 123a is supplied with power for a period of tIatL with a period of tIbatL (Sp2). The circuit 124a is supplied with power for a period of tVTHn with a period of tVTHnL for each thermistor n (Sp3 to SpN + 2). At this time, the sampling control circuit 128 calculates the period and period for supplying power to each detection circuit from the Fosc input from the oscillator 127.

  On the other hand, each detection circuit to which power is supplied from the siping control circuit 128 detects the presence or absence of abnormal operation during a period in which power is supplied for each cycle in which power is supplied. Note that the period during which the sampling control circuit 128 supplies power to each detection circuit needs to be longer than the predetermined time that the coincidence circuit corresponding to the detection circuit counts with the timer. For example, the period tVbat during which the sampling control circuit 128 supplies power to the battery voltage detection circuit 122a needs to be longer than the predetermined time tVbatDET that the battery voltage matching circuit 122b counts with a timer.

  As described above, the configuration in which power is intermittently supplied to the detection circuit can reduce the power consumption required for detecting an abnormal operation as compared with the configuration in which power is constantly supplied from the secondary battery 13 to the detection circuit. it can.

  In FIG. 9, the period and the period for supplying power to the detection circuit are shared by the detection circuits so that the periods for supplying power to the detection circuits supplying power to the detection circuit do not overlap. Yes. Thus, the second control circuit 125 selectively inputs Vbat DETO, Ibat DETO, and VTH DETO from the battery voltage matching circuit 122b, the battery current matching circuit 123b, and the temperature matching circuit 124b. There is no need to increase the circuit scale in preparation for simultaneous input. Note that even if the period for supplying power to each detection circuit that supplies power to the detection circuit overlaps, it is necessary for abnormal operation detection as intended by the portable terminal device of the second embodiment of the present invention. It is possible to reduce power consumption.

  When each detection circuit that has been supplied with power from the sampling control circuit 128 and started the presence or absence of an abnormal operation detects the abnormal operation, and the matching circuit connected to each detection circuit continues the abnormal operation for a predetermined time When the determination is made, the second control circuit 125 that has input a signal recognized as “High” from the coincidence circuit opens the second switch 126 and stops the power supply to the electronic circuit (abnormality detection processing stop period). ). Thereafter, when the second switch 126 is short-circuited and the power supply from the secondary battery 13 to the electronic circuit is started, the above-described processing is repeated.

  As described above, according to the mobile terminal device of the second embodiment of the present invention, the configuration in which power is intermittently supplied to each detection circuit, compared with the configuration in which power is constantly supplied from the secondary battery 13 to the detection circuit, It is possible to reduce power consumption necessary for detecting abnormal operation.

(Third embodiment)
Hereinafter, the mobile terminal device according to the third embodiment of the present invention will be described in detail. In FIG. 10, the functional block diagram in the portable terminal device of 2nd Embodiment of this invention is shown. In the mobile terminal device of the third embodiment of the present invention, a stabilized power source 129a, LPF 129b, 129c, and 129d are newly added as a configuration, and a battery voltage detection circuit 122a, a battery current detection circuit 123a, and a temperature from a secondary battery. The noise included in the driving power supplied to the detection circuit 124a is reduced. Hereinafter, the functions of the stabilized power source 129a and the LPFs 129b, 129c, and 129d will be mainly described. In FIG. 10, the target to which the same reference symbol as the reference symbol described in FIG. 8 is assigned is the same as that described in the functional block diagram of FIG. 8, and thus the description may be omitted.

  In recent mobile terminal devices, power consumption is reduced, and a driving voltage for driving an electronic circuit mounted on the mobile terminal device is also reduced. However, in a mobile terminal device that performs radio communication in a high frequency band, when the drive voltage is reduced, the influence of noise is relatively increased, and the fluctuation of the drive voltage is increased. If such a driving voltage having a large fluctuation is supplied to a detection circuit that detects an abnormal operation that has occurred in the portable terminal device, the operation of the detection circuit will be unstable, leading to erroneous detection. Further, when detecting the presence / absence of an abnormal operation occurring in the mobile terminal device by the drive voltage supplied from the secondary battery 13 as in the mobile terminal device of the present invention, the presence / absence of an accurate abnormal operation due to the fluctuation of the drive voltage. It was difficult to detect.

  Therefore, the mobile terminal device according to the third embodiment of the present invention supplies the drive voltage from the secondary battery 13 to the battery voltage detection circuit 122a, the battery current detection circuit 123a, and the temperature detection circuit 124a via the stabilized power supply 129a. By doing so, the malfunction due to unstable operation of the detection circuit is prevented. FIG. 10 illustrates a configuration in which the stabilized power source 129a supplies a drive voltage to the sampling control circuit 128 that intermittently supplies power to the battery voltage detection circuit 122a, the battery current detection circuit 123a, and the temperature detection circuit 124a. .

  The portable terminal device according to the third embodiment of the present invention also includes an LPF 129b between the battery wiring for supplying power from the secondary battery 13 to the electronic circuit and the battery voltage detection circuit 122a, and the battery wiring and battery current detection. By disposing the LPFs 129c and 129d between the circuit 123a and the circuit, the noise component is removed from the voltage detected by the detection circuit, and the presence or absence of an abnormal operation that can occur in the mobile terminal device can be accurately detected. .

  As described above, according to the mobile terminal device of the third embodiment of the present invention, it is possible to prevent malfunction due to unstable operation of the detection circuit by supplying a stable drive voltage to the detection circuit. In addition, the noise component is removed from the voltage detected by the detection circuit, and the presence or absence of an abnormal operation that may occur in the mobile terminal device can be accurately detected.

  According to the portable terminal device, the abnormal operation detection circuit, and the power supply control method of the present invention, there is an effect that the power supply from the external power source to the electronic circuit can be cut off when a failure occurs in the electronic circuit. This is useful in the field of portable terminal devices that stop power supply to an electronic circuit when an abnormal operation occurs in the electronic circuit provided in the electronic circuit.

The functional block diagram showing the basic composition in the portable terminal device of an embodiment of the invention Functional block diagram of the mobile terminal device according to the first embodiment of the present invention. Overview of determination processing at the time of application by a secondary battery by the mobile terminal device of the first embodiment of the present invention Outline of determination process of applied voltage by portable terminal device of first embodiment of the present invention. Overview of applied current determination processing by portable terminal device of first embodiment of the present invention Outline of determination process by thermistor by the mobile terminal device according to the first embodiment of the present invention. Outline of determination processing at the time of application by an external AC power supply by the mobile terminal device of the first embodiment of the present invention Functional block diagram of the portable terminal device of the second embodiment of the present invention The figure showing the electric power supply timing to the detection circuit in the portable terminal device of 2nd Embodiment of this invention. Functional block diagram of the portable terminal device of the second embodiment of the present invention Functional block diagram of a conventional portable terminal device having a function of cutting off power supply from a secondary battery

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable terminal device 11 AC power supply terminal 111 to electronic circuit External AC voltage detection circuit 112 First control circuit 113 OR circuit 114 First switch 12 Battery power supply terminal 121a to electronic circuit Reset circuit 121b Reset coincidence circuit 122a Battery voltage detection circuit 122b Battery voltage matching circuit 123a Battery current detection circuit 123b Battery current matching circuit 124a Temperature detection circuit 124b Temperature matching circuit 125 Second control circuit 126 Second switch 127 Oscillator 128 Sampling control circuit 129a Stabilized power supply 129b, 129c, 129d LPF filter)
13 Secondary batteries 141, 142... 14n Thermistor 2 External AC power supply 5 Portable terminal device 51 AC power supply terminal 52 Battery power supply terminal 523 Battery current detection circuit 524 Temperature detection circuit 525 Control circuit 526 Switch 53 Secondary batteries 541, 542 ..54n Thermistor 6 External AC power supply

Claims (27)

A portable terminal device capable of supplying power from an external power source,
Electronic circuit,
A detection unit for detecting an abnormal operation in at least one place of the electronic circuit;
A first switching unit that opens or short-circuits a part of a power transmission path connecting the external power source and the electronic circuit;
A switching control unit that switches to open the first switching unit when an abnormal operation is detected by the detection unit;
A mobile terminal device comprising: The mobile terminal device according to claim 1,
A secondary battery that is charged by power supplied from an external power source;
A second switching unit that opens or short-circuits a part of a power transmission path connecting the secondary battery and the electronic circuit;
The switching control unit switches to open the second switching unit when an abnormal operation is detected by the detection unit,
Mobile terminal device. The mobile terminal device according to claim 1 or 2,
A plurality of the detection units;
The switching control unit switches to open at least one of the first switching unit and the second switching unit, or both, when detecting an abnormal operation by at least one of the detection units,
Mobile terminal device. The portable terminal device according to any one of claims 1 to 3,
The switching control unit switches to open at least one of the first switching unit and the second switching unit or both when the detection unit continues to detect abnormal operation for a predetermined period of time.
Mobile terminal device. The mobile terminal device according to any one of claims 1 to 4,
A power supply control unit that intermittently supplies power for performing detection operation from the secondary battery to the detection unit;
The detection unit detects abnormal operation during a period in which power is supplied from the power supply control unit.
Mobile terminal device. The mobile terminal device according to claim 5,
A plurality of the detection units;
The power supply control unit switches from the secondary battery to each of the detection units so that the secondary battery is not supplied to two or more detection units at an arbitrary time, and supplies the detection units intermittently. ,
Mobile terminal device. The mobile terminal device according to any one of claims 1 to 6,
With a stabilized power supply,
The stabilized power supply outputs the power input from the secondary battery to the detection unit as power for performing a detection operation.
Mobile terminal device. The mobile terminal device according to any one of claims 1 to 7,
A portable terminal device comprising a low-pass filter disposed between the detection unit and a portion where an abnormal operation should be detected by the detection unit. It is a portable terminal device given in any 1 paragraph of Claims 1-8,
A portable terminal device comprising a storage unit for storing a type of abnormal operation detected by the detection unit. An abnormal operation detection circuit for detecting an abnormal operation occurring in an electronic circuit,
A detection unit for detecting an abnormal operation in at least one place of the electronic circuit;
A first switching unit for opening or short-circuiting a part of a power transmission path connecting an external power source and the electronic circuit;
A switching control unit that switches to open the first switching unit when an abnormal operation is detected by the detection unit;
An abnormal operation detection circuit comprising: The abnormal operation detection circuit according to claim 10,
A second switching unit that opens or short-circuits a part of a power transmission path that connects the secondary battery that is charged by power supplied from an external power source and the electronic circuit;
The switching control unit switches to open the second switching unit when an abnormal operation is detected by the detection unit,
Abnormal operation detection circuit. The abnormal operation detection circuit according to claim 10 or 11,
A plurality of the detection units;
The switching control unit switches to open at least one of the first switching unit and the second switching unit, or both, when detecting an abnormal operation by at least one of the detection units,
Abnormal operation detection circuit. The abnormal operation detection circuit according to any one of claims 10 to 12,
The switching control unit switches to open at least one of the first switching unit and the second switching unit or both when the detection unit continues to detect abnormal operation for a predetermined period of time.
Abnormal operation detection circuit. The abnormal operation detection circuit according to any one of claims 10 to 13,
A power supply control unit that intermittently supplies power for performing detection operation from the secondary battery to the detection unit;
The detection unit detects abnormal operation during a period in which power is supplied from the power supply control unit.
Abnormal operation detection circuit. The abnormal operation detection circuit according to claim 14,
A plurality of the detection units;
The power supply control unit switches from the secondary battery to each of the detection units so that the secondary battery is not supplied to two or more detection units at an arbitrary time, and supplies the detection units intermittently. ,
Abnormal operation detection circuit. The abnormal operation detection circuit according to any one of claims 10 to 15,
With a stabilized power supply,
The stabilized power supply outputs the power input from the secondary battery to the detection unit as power for performing a detection operation.
Abnormal operation detection circuit. The abnormal operation detection circuit according to any one of claims 10 to 16,
An abnormal operation detection circuit comprising a low-pass filter disposed between the detection unit and a portion where an abnormal operation should be detected by the detection unit. The abnormal operation detection circuit according to any one of claims 10 to 17,
An abnormal operation detection circuit including a storage unit that stores a type of abnormal operation detected by the detection unit. A power supply control method by an abnormal operation detection circuit for detecting an abnormal operation occurring in an electronic circuit,
Detecting an abnormal operation in at least one location of the electronic circuit;
When detecting the abnormal operation, open a part of the power transmission path connecting the external power supply and the electronic circuit,
Power supply control method. The power supply control method according to claim 19, wherein
When detecting the abnormal operation, open a part of the power transmission path connecting the secondary battery and the electronic circuit to be charged by the power supplied from the external power source,
Power supply control method. The power supply control method according to claim 19 or 20,
Detecting abnormal operation at multiple locations of the electronic circuit;
A portion of a power transmission path connecting the external power supply and the electronic circuit when an abnormal operation is detected in at least one place, and a secondary battery charged by the power supplied from the external power supply and the electronic circuit. Switch to open one or both of the connected power transmission paths,
Power supply control method. The power supply control method according to any one of claims 19 to 21,
When abnormal operation continues to be detected for a predetermined period, a part of a power transmission path that connects the external power supply and the electronic circuit, a secondary battery that is charged by power supplied from the external power supply, and the electronic circuit Switch to open one or both of the connected power transmission paths,
Power supply control method. The power supply control method according to any one of claims 19 to 22,
From the secondary battery, intermittently supplying power for causing the detection unit to detect an abnormal operation occurring in the electronic circuit,
While the power is supplied, the detection unit detects an abnormal operation.
Power supply control method. The power supply control method according to claim 23, wherein
Switch to each of the plurality of detection units so as not to be supplied from the secondary battery to the two or more detection units at an arbitrary time point, and supply intermittently,
Power supply control method. A power supply control method according to any one of claims 19 to 24,
Input power from the secondary battery to the stabilized power supply,
The stabilized power supply outputs electric power for causing the detection unit to detect an abnormal operation occurring in the electronic circuit to perform the detection operation.
Power supply control method. The power supply control method according to any one of claims 19 to 25, wherein:
An electric power supply control method comprising a low-pass filter disposed between a detection unit that detects an abnormal operation occurring in an electronic circuit and a portion where the detection unit should detect the abnormal operation. A power supply control method according to any one of claims 19 to 26, wherein
A power supply control method for storing a type of detected abnormal operation.

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