JP2012130188A - Device for corresponding to instantaneous power interruption - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for corresponding to instantaneous power interruption, capable of correctly setting instantaneous interruption time.SOLUTION: A cellular phone 1 comprise a battery pack 2, and a device 10 for corresponding to instantaneous power interruption. The device 10 for corresponding to instantaneous power interruption comprises a backup power supply 11 for supplying electric power to an RTC 12 and an instantaneous interruption corresponding section 13 when the supply of the electric power from the battery pack 2 is stopped; the RTC 12 for outputting a clock pulse; and the instantaneous interruption corresponding section 13 having a voltage setting circuit 16 for detecting instantaneous interruption. The voltage setting circuit 16 obtains instantaneous interruption time by the number of pulses in the clock pulse, starts up a power supply again when the instantaneous interruption time is smaller than a threshold value, and keeps a power supply turning off state when the instantaneous interruption time matches with the threshold value.

Description

  The present invention relates to a power supply interruption response device that maintains a previous state even when power supply is momentarily stopped.

  In a portable device, an instantaneous power interruption may occur in which the supply of power from a battery pack or the like stops instantaneously due to an impact such as dropping. For this reason, the conventional portable device is provided with a power supply interruption response circuit. This instantaneous power failure response circuit is a circuit that keeps the state before the power failure is turned on again within the set time even if there is a momentary power failure. Conventionally, as means for grasping the instantaneous interruption time, a time constant circuit is constituted by a resistor and a capacitor, and the discharge time of the time constant circuit is used (for example, see Patent Document 1).

JP-A-8-191545

  However, in the configuration using the conventional time constant circuit, there is a problem that the instantaneous interruption time cannot be set accurately due to variations in the resistance and capacitor values of the time constant circuit and the input resistance of the circuit connected to the time constant circuit. there were.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a power supply interruption response device capable of accurately setting an instantaneous interruption time.

  An apparatus for dealing with instantaneous power interruption of the present invention includes a detachable battery, and a circuit unit to which electric power of the battery is supplied via a switch element, and the power supply from the battery is instantaneously interrupted. An apparatus for dealing with instantaneous power interruption provided in an electronic device in which the power supply is stopped by changing a switch element from an on state to an off state, a clock pulse output unit that outputs a clock pulse of a predetermined frequency; An instantaneous interruption time detection unit that detects an instantaneous interruption time when the power supply is instantaneously interrupted by the number of pulses of the clock pulse, and the switch element is turned on and off based on the instantaneous interruption time detected by the instantaneous interruption time detection unit A switching element control unit that is set to one of the states, and a backup device that supplies power to the clock pulse output unit, the instantaneous interruption time detection unit, and the switching element control unit during the instantaneous interruption time. A power source, and the switch element control unit switches the switch element from an off state to an on state when the instantaneous interruption time is less than a predetermined threshold time, and when the instantaneous interruption time is equal to or greater than the threshold time, The switch element is configured to maintain the OFF state.

  With this configuration, the instantaneous power interruption time detecting unit detects the instantaneous power interruption time based on the number of clock pulses, so that the instantaneous power interruption time can be accurately set.

  In the power supply interruption device of the present invention, the clock pulse output unit is a real-time clock that measures the current time.

  With this configuration, the instantaneous interruption time detection unit detects the instantaneous interruption time based on the number of clock pulses generated by the clock pulse output unit, and thus the instantaneous interruption time detection unit accurately sets the instantaneous interruption time. be able to.

  Furthermore, the instantaneous power failure response device of the present invention has a configuration in which the clock pulse output unit, the instantaneous power failure time detection unit, and the switch element control unit are built in one IC package.

  With this configuration, in the power supply interruption device of the present invention, the clock pulse output unit, the instantaneous interruption time detection unit, and the switch element control unit can be easily formed into one chip.

  The present invention can provide a power supply interruption response device having an effect that the instantaneous interruption time can be accurately set.

It is a block diagram which shows the structure of the mobile telephone in 1st Embodiment of this invention. It is operation | movement explanatory drawing of the power supply interruption response apparatus in 1st Embodiment of this invention. It is a block diagram which shows the structure of the mobile telephone in 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. An example in which the device for handling a power interruption of the present invention is applied to a mobile phone will be described.

(First embodiment)
First, the configuration of the mobile phone according to the first embodiment of the present invention will be described.

  As shown in FIG. 1, the mobile phone 1 according to the present embodiment includes a battery pack 2, a connection terminal 3, transistors 4 to 6, a power switch 7, a circuit unit 8, and a power supply interruption response device 10. The power supply interruption response device 10 includes a backup power supply 11, a real time clock (hereinafter referred to as “RTC”) 12, and an instantaneous interruption response unit 13. The instantaneous interruption response unit 13 includes an instantaneous interruption monitoring circuit 14, a memory 15, and a voltage setting circuit 16.

  The battery pack 2 includes a battery 2a and a connection terminal 2b. The connection terminal 2b is in contact with and electrically connected to the connection terminal 3 on the main body side.

  The transistor 4 is composed of a PNP transistor and has an emitter electrode, a collector electrode, and a base electrode. In the transistor 4, the emitter electrode is connected to the connection terminal 3, and the collector electrode is connected to the circuit unit 8. The base electrode is connected to the transistors 5 and 6 and the power switch 7. Here, the transistor 4 constitutes a switch element according to the present invention.

  The transistors 5 and 6 are each formed of an NPN transistor and have an emitter electrode, a collector electrode, and a base electrode.

  The collector electrode of the transistor 5 is connected to the base electrode of the transistor 4. The base electrode of the transistor 5 is connected to the power supply interruption response device 10. The emitter electrode of the transistor 5 is grounded.

  The collector electrode of the transistor 6 is connected to the base electrode of the transistor 4. A base electrode of the transistor 6 is connected to the circuit unit 8. The emitter electrode of the transistor 6 is grounded.

  The power switch 7 is constituted by, for example, a push button switch having two contacts. One contact of the power switch 7 is connected to the base electrode of the transistor 4 and the other contact is grounded.

  Although not shown in detail, the circuit unit 8 includes a CPU 8a and other circuits for realizing mobile phone functions such as a program ROM, a RAM, and a transmission / reception circuit for the CPU 8a to read a program when the CPU 8a is activated. When the power switch 7 is kept pressed for a predetermined time or longer (hereinafter referred to as “long press”), the CPU 8a maintains a power supply signal (PH signal in the figure) for maintaining the transistor 4 in an ON state. ) Is output to the base electrode of the transistor 6. Further, the CPU 8a outputs a power-on signal indicating that the power is turned on to the voltage setting circuit 16 when the power switch 7 is pressed for a long time.

  The backup power source 11 is constituted by, for example, a primary battery or a secondary battery, and can supply power to the RTC 12 and the instantaneous interruption response unit 13 even when the supply of power from the battery pack 2 is stopped. Yes. This backup power supply 11 outputs a voltage sufficient to turn on the transistor 5.

  The RTC 12 is composed of, for example, an IC having a function of measuring the current time based on a clock pulse having a frequency of 32.768 kHz. The RTC 12 outputs a clock pulse having a frequency of 32.768 kHz to the voltage setting circuit 16. The RTC 12 constitutes a clock pulse output unit according to the present invention.

  The instantaneous interruption monitoring circuit 14 is connected to the connection terminal 3 and monitors the battery voltage Vcc of the battery 2 a of the battery pack 2. Further, the instantaneous interruption monitoring circuit 14 has a high level signal indicating that the battery voltage Vcc is equal to or higher than a predetermined threshold voltage Vth, and a low level indicating that when the battery voltage Vcc is less than the threshold voltage Vth. The signal is output to the voltage setting circuit 16.

  The memory 15 stores data of a count value of the number of pulses (hereinafter referred to as “set count value”) for setting a predetermined threshold of instantaneous interruption time. This set count value is set, for example, by a program that the CPU 8a reads from the program ROM when the cellular phone 1 is powered on.

  The voltage setting circuit 16 includes a counter circuit 16a. The counter circuit 16a counts the number of clock pulses output from the RTC 12. The voltage setting circuit 16 sets the voltage applied to the base electrode of the transistor 5 based on the signal from the instantaneous interruption monitoring circuit 14. Here, the voltage applied to the base electrode of the transistor 5 is generated by the voltage setting circuit 16. The voltage setting circuit 16 constitutes an instantaneous interruption time detection unit and a switch element control unit according to the present invention.

  Specifically, the voltage setting circuit 16 operates as follows after receiving a power-on signal from the CPU 8a. Note that before the voltage setting circuit 16 receives the power-on signal from the CPU 8a, the voltage applied to the base electrode of the transistor 5 by the voltage setting circuit 16 is at a low level, and the transistor 5 is in the off state.

  First, the voltage setting circuit 16 applies a high level voltage that turns on the transistor 5 to the base electrode of the transistor 5 during a period in which a high level signal is input from the instantaneous interruption monitoring circuit 14. Yes.

  On the other hand, the voltage setting circuit 16 turns on the transistor 5 during a period in which the count value of the counter circuit 16a after the low-level signal is input from the instantaneous interruption monitoring circuit 14 is smaller than the set count value read from the memory 15. Is applied to the base electrode of the transistor 5.

  The voltage setting circuit 16 is a period in which a low level signal is input from the instantaneous interruption monitoring circuit 14, and when the count value of the counter circuit 16 a matches the set count value read from the memory 15, the transistor A voltage for turning off 5 is applied to the base electrode of the transistor 5.

  Next, the operation of the mobile phone 1 in this embodiment will be described. In the following description, it is assumed that the RTC 12 outputs a clock pulse having a frequency of 32.768 kHz to the voltage setting circuit 16, and the memory 15 stores data indicating 65000 counts (corresponding to about 2 seconds) as a set count value. It shall be.

  When the power switch 7 is closed by a long press of the power switch 7 by the user, the base electrode of the transistor 4 is grounded, the transistor 4 is turned on from the off state, and the power of the battery 2 a is supplied to the circuit unit 8.

  The CPU 8 a of the circuit unit 8 outputs a power-on signal to the voltage setting circuit 16. As a result, the voltage setting circuit 16 applies a high level voltage to the base electrode of the transistor 5.

  Further, the CPU 8a generates a power hold signal and outputs it to the base electrode of the transistor 6. As a result, the transistor 6 changes from the off state to the on state, and then the transistor 4 remains on even when the power switch 7 is opened, and the power of the battery 2a is continuously supplied to the circuit unit 8. .

  In this state, the instantaneous interruption monitoring circuit 14 outputs a high level voltage to the voltage setting circuit 16 because the connection terminal 2b of the battery pack 2 and the connection terminal 3 on the main body side are connected.

  Here, it is assumed that the battery voltage monitored by the instantaneous interruption monitoring circuit 14 is less than the threshold voltage. For example, when an impact due to dropping or the like is applied to the mobile phone 1, the connection terminal 2b of the battery pack 2 and the connection terminal 3 on the main body side are momentarily separated, or the user of the mobile phone 1 performs a power-off operation It is. In this case, the transistor 4 changes from the on state to the off state, and the power of the battery 2a is not supplied to the circuit unit 8 (hereinafter referred to as “power supply non-supply state”). As a result, the CPU 8a stops outputting the power hold signal, so that the transistor 6 changes from the on state to the off state.

  On the other hand, since the power supply 10 is supplied from the backup power supply 11 to the RTC 12 and the instantaneous interruption response unit 13 in the power supply non-supply state, the instantaneous power interruption response apparatus 10 operates as follows.

  The RTC 12 outputs a clock pulse having a frequency of 32.768 kHz to the voltage setting circuit 16. The counter circuit 16a of the voltage setting circuit 16 counts the number of clock pulses. The voltage setting circuit 16 reads the set count value from the memory 15. The voltage setting circuit 16 sets a voltage to be applied to the base electrode of the transistor 5 based on the signal from the instantaneous interruption monitoring circuit 14. Hereinafter, a description will be given with reference to FIG.

  First, as shown in FIG. 2A, a case where the power supply non-supply state is a period from time t1 to t2 will be described.

  In this case, the instantaneous interruption monitoring circuit 14 detects that the battery voltage has changed from the normal voltage Vcc to 0 volts at time t1, and at time t2 has detected that the battery voltage has changed from 0 volts to voltage Vcc. To detect. That is, the output level from the instantaneous interruption monitoring circuit 14 is high level until time t1, low level during the period from time t1 to t2, and high level after time t2.

  In the period from time t1 to t2, the count value is 3 counts (corresponding to about 92 μs), which is smaller than the set count value (65000 counts). Therefore, in the power supply non-supply state, the output level of the voltage setting circuit 16 that is supplied with power from the backup power supply 11 remains at a high level, and the transistor 5 is maintained in the on state. As a result, when the connection terminal 2b of the battery pack 2 and the connection terminal 3 on the main body side are connected again at time t2, the transistor 4 is turned on and the power of the battery 2a is supplied to the circuit unit 8. Then, a power hold signal is output from the CPU 8a to the base electrode of the transistor 6, the transistor 4 is maintained in the on state, and the supply of power to the circuit unit 8 is held.

  Next, as shown in FIG. 2B, a case where the power supply non-supply state is a period from time t1 to t3 will be described. Here, the number of clock pulses in the period from time t1 to t3 is a set count value (65000 counts).

  In this case, the instantaneous interruption monitoring circuit 14 detects that the battery voltage has become 0 volt from the normal voltage Vcc at time t1, and the signal level output to the voltage setting circuit 16 changes from the high level to the low level. .

  The voltage setting circuit 16 switches the level of the output signal from the high level to the low level at time t3 when the count value of the counter circuit 16a coincides with the set count value (= 65000 counts) after time t1. As a result, the transistor 5 is turned off, and the state in which the power of the battery 2a is not supplied to the circuit unit 8 (power-off state) is continued. The operation illustrated in FIG. 2B is an operation when the user performs a power-off operation, for example.

  As described above, according to the mobile phone 1 of the present embodiment, since the voltage setting circuit 16 detects the instantaneous interruption time based on the number of clock pulses, the instantaneous interruption time can be accurately set.

  Further, in the mobile phone 1 according to the present embodiment, since the memory 15 stores the setting count value of the number of pulses for setting the threshold of the instantaneous interruption time, the instantaneous interruption time can be easily set or changed by software. Can be changed.

(Second Embodiment)
First, the configuration of the mobile phone according to the second embodiment of the present invention will be described. The cellular phone 9 in the present embodiment is obtained by changing a part of the configuration of the cellular phone 1 (see FIG. 1) in the first embodiment, and the same components as those in the cellular phone 1 are denoted by the same reference numerals. Therefore, the description is omitted.

  As shown in FIG. 3, the mobile phone 9 in this embodiment includes a battery pack 2, a connection terminal 3, a transistor 4, a power switch 7, a circuit unit 8, and a power supply interruption response device 20.

  The power supply interruption response device 20 includes a backup power supply 11, an RTC 12, an instantaneous interruption response unit 13, and a NOR (negative logical sum) circuit 21. Here, the RTC 12, the instantaneous interruption response unit 13, and the NOR circuit 21 are built in one IC package.

  The NOR circuit 21 is connected to the backup power source 11, and power is supplied from the backup power source 11 even when the supply of power from the battery pack 2 is stopped. The NOR circuit 21 receives the output signal of the voltage setting circuit 16 and the power hold signal from the CPU 8a, and sets the transistor 4 to an on state or an off state based on the signal levels of both signals. Yes.

  Specifically, the NOR circuit 21 outputs a low level signal to turn on the transistor 4 when at least one of the output signal of the voltage setting circuit 16 and the power hold signal is at a high level. ing. Further, the NOR circuit 21 outputs a high level signal only when the output signal of the voltage setting circuit 16 is at a low level and the power hold signal is at a low level, thereby turning off the transistor 4. .

  As described above, according to the mobile phone 9 of the present embodiment, the voltage setting circuit 16 detects the instantaneous interruption time based on the number of clock pulses, and the NOR circuit 21 turns on the transistor 4 based on the detected instantaneous interruption time. Since the configuration is set to the state or the off state, the instantaneous interruption time can be set accurately, and the RTC 12, the instantaneous interruption response unit 13, and the NOR circuit 21 can be integrated into one chip.

  In addition, with the configuration described above, in the mobile phone 9 according to the present embodiment, the RTC 12, the instantaneous interruption response unit 13, and the NOR circuit 21 can be manufactured as an ASIC (Application Specific Integrated Circuit). Further, the RTC 12, the instantaneous interruption response unit 13, and the NOR circuit 21 can be integrated with the CPU 8a. The NOR circuit 21 may be a switching element such as a transistor or FET.

  As described above, the power failure handling device according to the present invention has an effect that the instantaneous power failure time can be set accurately, and even if the supply of power is stopped instantaneously, the previous state is maintained. It is useful as a power supply interruption device to be held.

DESCRIPTION OF SYMBOLS 1, 9 Mobile phone 2 Battery pack 2a Battery 2b, 3 Connection terminal 4 Transistor (switch element)
5, 6 Transistor 7 Power switch 8 Circuit 8a CPU
10 Power supply interruption device 11 Backup power supply 12 RTC (clock pulse output unit)
13 Instantaneous interruption response unit 14 Instantaneous interruption monitoring circuit 15 Memory 16 Voltage setting circuit (instantaneous interruption time detection unit, switch element control unit)
16a Counter circuit 20 Instantaneous power failure response device 21 NOR circuit

Claims (3)

A detachable battery, and a circuit unit to which power of the battery is supplied via a switch element, and the switch element changes from an on state to an off state when power supply from the battery is momentarily interrupted. A power supply interruption response device provided in an electronic device in which the power supply is stopped,
A clock pulse output unit for outputting a clock pulse of a predetermined frequency;
An instantaneous interruption time detection unit for detecting an instantaneous interruption time when the power supply is instantaneously interrupted by the number of pulses of the clock pulse;
A switch element control unit that sets the switch element to either an on state or an off state based on the instantaneous interruption time detected by the instantaneous interruption time detection unit;
A backup power supply that supplies power to the clock pulse output unit, the instantaneous interruption time detection unit, and the switch element control unit during the instantaneous interruption time,
The switch element control unit switches the switch element from an off state to an on state when the instantaneous interruption time is less than a predetermined threshold time, and sets the switch element off state when the instantaneous interruption time is equal to or greater than the threshold time. A device that supports power interruption that is to be maintained.   The apparatus according to claim 1, wherein the clock pulse output unit is a real-time clock that measures a current time.   The power supply instantaneous interruption corresponding apparatus of Claim 1 or Claim 2 with which the said clock pulse output part, the instantaneous interruption time detection part, and the said switch element control part are incorporated in one IC package.

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