JP2015023729A - Battery backup apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery backup apparatus which can be connected to a backup object such as a vehicle with high reliability and can execute a backup operation with high reliability when a battery is removed.SOLUTION: The battery backup apparatus 1 includes: an impedance detection section 28 that measures electric AC impedance of a backup object; a connection determination section 241 that determines whether or not a connection state electrically connected with the backup object exists, using a measurement value of AC impedance with the impedance detection section 28; and a power supply section 21 that supplies electric power to the backup object, provided that the connection determination section 241 determines a connection state.

Description

  The present invention relates to a battery backup device that supplies backup power when a battery mounted on a backup target such as a vehicle is removed.

  Conventionally, for example, when replacing a battery mounted on a vehicle or the like, backup power has been supplied to various in-vehicle devices such as navigation devices, car radios, watches, and control electronic control units (ECUs). A battery backup device is used (see, for example, Patent Document 1).

  If you perform battery replacement work using a battery backup device, you can remove the battery while maintaining the power supply state for the on-vehicle equipment that is the load on the vehicle, for example, the registration point stored in the navigation device, It is possible to avoid erasure of channel selection information preset in the car radio and memory data such as a learning value stored in the control ECU.

JP-A-8-149719

  However, the conventional battery backup device has the following problems. That is, when the battery backup device is not correctly connected to the vehicle side, there is a problem that a problem occurs that memory data is erased when the battery is removed.

  The present invention has been made in view of the above-mentioned conventional problems, and can be connected with high reliability to a backup target such as a vehicle, and can perform backup operation when the battery is removed with high reliability. Is to provide.

The present invention is a battery backup device for supplying power to a backup target when the battery is removed from the backup target equipped with a battery,
An impedance measurement unit for measuring electrical AC impedance to be backed up;
A connection determination unit that determines whether or not the connection state is electrically connected to the backup target using the measurement value of the AC impedance by the impedance measurement unit,
The battery backup device includes a power supply unit that supplies power to the backup target on condition that the connection determination unit determines that the connection state is established.

  The battery backup device of the present invention includes an impedance measurement unit that measures the alternating current impedance to be backed up. According to the connection determination unit using the measurement value of the AC impedance, it is possible to determine with high certainty whether or not the battery backup device is connected to the backup target. If the connection determination unit determines the connection state, it is possible to avoid with high certainty the situation where the power supply to the backup target is interrupted when the battery is removed.

  As described above, the battery backup device of the present invention can determine the electrical connection state with respect to the backup target with high reliability, and thereby perform battery backup operation with high reliability when the battery is removed. Device.

  Examples of backup targets to which the battery backup device of the present invention is applied include vehicles such as automobiles and motorcycles, automatic conveyance vehicles operated in specific facilities such as factories, and battery-driven production robots (production devices). There are various devices such as computers equipped with a backup battery and electronic devices such as portable terminals.

A battery backup device according to a preferred aspect of the present invention includes a reverse connection detection unit that detects a reverse connection state in which the electrical positive / negative is erroneously connected to the backup target,
The connection determination unit determines an incorrect connection state when a reverse connection state is detected by the reverse connection detection unit.

  The electrical AC impedance to be backed up is measured in the same manner regardless of whether the electrical positive / negative is in the correct connection state or the reverse connection state. If the reverse connection detection unit is provided in addition to the impedance measurement unit, the reverse connection state can be detected, and whether or not the connection state is established can be determined with higher certainty.

The impedance measuring unit included in the battery backup device according to a preferred aspect of the present invention measures two or more types of alternating current impedances having different frequencies,
The connection determination unit determines whether the connection state with respect to the backup target is correct or not by using the measured values of the two or more types of AC impedance.

  In this case, the connection state can be determined with higher accuracy by using AC impedances of two or more frequencies having different frequencies. In order to measure two or more types of AC impedance, it is only necessary to apply the AC of the corresponding frequency to the backup target. Although alternating currents with different frequencies may be applied in a time-sharing manner, alternating rectangular waves including a wide range of frequencies may be applied. When an AC rectangular wave is used, AC with a wide frequency can be simultaneously applied to the backup target.

  It is also possible to acquire a change in backup AC impedance with respect to the frequency in advance and determine the connection state by comparing the AC impedance measured for each frequency with this AC impedance change. If the backup target is a vehicle, the AC impedance change may be acquired for each vehicle type. Further, for the same vehicle type, for example, it is also possible to acquire an alternating current impedance change for each specification having different navigation devices set as options.

  A battery backup device according to a preferred aspect of the present invention is a battery backup device applied to a vehicle to be backed up, and is provided on a vehicle side or a clamp that can hold an electrical terminal provided on the vehicle side. A cigar plug that can be connected to the cigar socket is provided, and the cigar plug is electrically connected to the vehicle via the clamp or cigar plug.

  For example, if a dedicated connector corresponding to the vehicle-side connector is used, the battery backup device can be connected with high reliability. However, it is necessary to prepare a dedicated connector for each vehicle type and vehicle body manufacturer, and the versatility of the battery backup device may be impaired. If the clamp or cigar plug can be used, the connection is possible regardless of the type of vehicle, the body maker, etc., and the versatility is improved. On the other hand, a trouble due to a connection error may be induced. In such a case, the configuration of the present invention that determines the connection state using the measured value of the AC impedance on the vehicle side is particularly useful.

1 is a perspective view showing a battery backup device in Embodiment 1. FIG. 1 is a block diagram showing a system configuration of a battery backup device in Embodiment 1. FIG. FIG. 3 is a circuit diagram illustrating a circuit configuration of an impedance detection unit according to the first embodiment. Explanatory drawing which shows the alternating current waveform which an impedance detection part outputs in Example 1. FIG. FIG. 3 is a circuit diagram illustrating a circuit configuration of a reverse connection detection unit in the first embodiment. The semilogarithm graph showing the relationship between the detection voltage Vi and alternating current impedance in Example 1. FIG.

The embodiment of the present invention will be specifically described with reference to the following examples.
Example 1
This example is an example related to the battery backup device 1 used for battery replacement work of a vehicle (automobile) 5 to be backed up. This will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the battery backup device 1 of the present example uses the impedance detection unit (impedance measurement unit) 28 that measures the AC impedance of the load 52 on the vehicle side, and the vehicle 5 using the measured value of the AC impedance. A connection determination unit 241 that determines whether or not an electrical connection state is established, a power supply unit 21 that supplies backup power to the vehicle side on the condition that the connection determination unit 241 determines that the connection state is established, It has.
Hereinafter, this content will be described in detail.

  The battery backup device 1 is a device for supplying backup power when the vehicle battery 51 is removed for battery replacement work, for example. If backup power is supplied when the vehicle battery 51 is removed, the learning value stored in the ECU or the like that controls the engine or the automatic transmission and the memory data of the navigation device or the like can be held with high reliability.

  As shown in FIG. 1, the battery backup device 1 is an external device such as a small refrigerator. Caster wheels 19 are attached to the bottom surface so that the operator can move to the side of the vehicle 5 by hand. The top panel 1P of the battery backup device 1 is provided with a connector 120 for attaching the connection cable 12 in addition to various indicators and operation buttons.

A connector 120, indicators 11A and 11B, and a power button 10 are disposed on the front side of the top panel 1P from the left side.
Various connection cables such as a connection cable 12 having a clamp 121 attached to the tip and a connection cable (not shown) having a cigar socket attached to the tip can be selectively connected to the connector 120.

  Two sets of indicators 11 are provided side by side, each consisting of a combination of an OK lamp 111 for notifying normality and an NG lamp 112 for notifying abnormality. The left indicator 11A is an indicator for displaying whether or not the measured value of the AC impedance is appropriate, and the right indicator 11B is an indicator for displaying whether the positive / negative is correctly connected or reversely connected. It is.

  On the back side of the AC impedance indicator 11A, an AC impedance display meter 13 is arranged. In a space on the right side of the display meter 13, a start button 151 and a stop button 152 for starting and stopping the supply of backup power are arranged.

  As shown in FIG. 2, the battery backup device 1 incorporates a backup battery 211 serving as a supply source of backup power. The battery backup device 1 includes a CPU (Central Processing Unit) 24 having a function as the connection determination unit 241, an output control unit 25 controlled by the CPU 24, a vehicle voltage determination unit 231, and a current detection amplifier 232. 23, a power supply unit 21 including a backup battery 211 and a current limiting unit 212, an impedance detection unit 28 that measures an AC impedance on the vehicle side, and a reverse connection detection unit 27 that detects a reverse connection state.

  In the vehicle 5 to be backed up by the battery backup device 1, an electric circuit including a vehicle battery 51 and a load 52 such as an engine ECU (not shown), a navigation device, and an audio player is formed.

  The vehicle voltage determination unit 231 is a circuit that measures the voltage acting between the positive and negative of the connection cable 12 as a load voltage and determines whether it is right or wrong. The current detection amplifier 232 is a circuit that detects the current output from the current limiting unit 212. The impedance detection unit 28 is a circuit that detects the AC impedance of the load 52 on the vehicle side. The reverse connection detection unit 27 is a circuit that detects a reverse connection state in which positive and negative are connected in reverse.

  As shown in FIG. 3, the impedance detection unit 28 includes a voltage application unit 281 that applies an AC voltage to the load 52 on the vehicle side, and a detection unit 282. The voltage application unit 281 is a circuit that applies a 5 Vp-p AC voltage generated by the AC generation source 280 to the load side via the current limiting resistor R8 and the capacitor C1. The detector 282 is a circuit composed of resistors R9 and R10, diodes D4 and D5, and a capacitor C3, and is coupled to the load side via the capacitor C2. In the detection unit 282, the voltage across the resistor R10 is detected as the detection voltage Vi.

The AC generation source 280 is a power source that generates an AC rectangular wave illustrated in FIG. When this AC rectangular wave acts on the vehicle-side load 52 from the voltage application unit 281, the load-side AC impedance is calculated by the following equation.

  As shown in FIG. 5, the reverse connection detection unit 27 detects the reverse connection state based on the reverse connection detection voltage Vr. When the upper clamp 121 is correctly connected to the vehicle-side positive pole and the lower clamp 121 is correctly connected to the vehicle-side negative pole, the reverse connection detection voltage Vr becomes Hi = Vcc (5 V). On the other hand, in the reverse connection state in which the clamp 121 is connected positively and negatively, an electrical path is formed by the diode D6 → the resistor R12 → the diode D7, and thereby the reverse connection detection voltage Vr becomes Lo.

Next, the operation of the battery backup device 1 of this example configured as described above will be described.
In using this battery backup device 1, first, a pair of clamps 121 provided at the tip of the connection cable 12 is connected to the vehicle-side load 52. It is also possible to use a connection cable (not shown) with a cigar plug attached to the tip. When the cigar plug is used, it is necessary to switch the power supply state of the vehicle 5 to the Acc-on state in advance so that a vehicle-side cigar socket (not shown) is energized.

The battery backup device 1 that has started energization by the operation of the power button 10 first performs connection determination by reverse connection detection and AC impedance measurement. About the measured value of alternating current impedance, while being displayed on the display meter 13, it is displayed on the indicator 11A whether the measured value is appropriate. When the measured value of the AC impedance is within the appropriate range (OK range) in FIG. 6, the OK lamp 111A is lit, and when it is not appropriate, the NG lamp 112A is lit. FIG. 6 is a semilogarithmic graph in which the detection voltage Vi is plotted on the vertical axis and the AC impedance is defined on the logarithmic scale on the horizontal axis.
When the reverse connection detection voltage Vr is detected as Lo and reverse connection is detected, the NG lamp 112B of the indicator 11B is turned on, and when Vr is Hi and the reverse connection is not detected, the OK lamp 111B is turned on.

  When the OK lamps 111A and 111B of the respective indicators 11A and 11B are turned on, a state in which the start button 151 can be effectively operated is set. The battery backup device 1 sets a backup mode capable of outputting backup power when the start button 151 is operated effectively. On the other hand, when the NG lamps 112A and 112B of any of the indicators 11 are lit, the start button 151 cannot be effectively operated, and the battery backup device 1 does not accept the start operation.

  The battery backup device 1 under the backup mode outputs backup power with current limited on condition that a voltage (vehicle side voltage) of a predetermined value or more is acting between the positive and negative of the connection cable 12. On the other hand, when the vehicle side voltage is less than the predetermined value even in the backup mode, the output of the backup power is prohibited.

  The battery backup device 1 continuously measures the AC impedance in the backup mode, and displays the measured value on the display meter 13 as needed. An operator who replaces the battery of the vehicle 5 can remove the vehicle battery 51 after confirming the AC impedance displayed on the display meter 13 and reliably proceed with the battery replacement operation.

  Even when the vehicle battery 51 is removed, the vehicle-side voltage detected by the vehicle voltage determination unit 231 is maintained at a predetermined value or higher due to the voltage applied by the backup battery 211 to the vehicle-side load 52. . Therefore, the output of the backup power is not interrupted even when the vehicle battery 51 is removed.

  Even if an electrical trouble such as a short circuit occurs in the backup mode, the backup power is limited in current, so there is no possibility that an overcurrent will act on the vehicle-side load 52. Furthermore, when an electrical trouble such as a short circuit occurs, the battery backup device 1 cannot maintain the self-holding voltage, so that the vehicle-side voltage detected by the vehicle voltage determination unit 231 decreases. With the battery backup device 1 of this example that outputs backup power on condition that the vehicle-side voltage is equal to or greater than a predetermined value, the backup power can be instantaneously interrupted, so that an overcurrent may act on the vehicle-side load 52. There is no.

  Thereafter, after the vehicle battery 51 is attached, the output of the backup power can be stopped by operating the stop button 152 of the battery backup device 1. If the clamp 121 of the connection cable 12 is removed from the vehicle side and the power button 10 is turned off, the battery replacement work of the vehicle 5 can be completed.

  As described above, the battery backup device 1 of the present example determines whether the correct connection state is ensured by measuring the AC impedance on the vehicle side to be backed up and detecting the reverse connection state. If the AC impedance is appropriate and the reverse connection is not established, it can be determined with high certainty that the vehicle 5 is correctly connected. In such a state determined to be a correct connection state, there is very little possibility that power supply is interrupted when the vehicle battery 51 is removed, and troubles such as loss of memory data can be avoided in advance.

  As described above, by using the battery backup device 1 of this example, it is possible to perform battery replacement work of the vehicle 5 with high reliability while avoiding troubles such as loss of memory data. Furthermore, according to the battery backup device 1, when an electrical short circuit or the like occurs for some reason, the backup power can be stopped immediately, thereby ensuring high safety during the backup operation.

  In this example, alternating current of a predetermined frequency is used to measure the alternating current impedance of the load 52 on the vehicle side. It is also possible to apply alternating currents of various frequencies to the load 52 on the vehicle side while switching the frequencies and measure the alternating current impedance for each frequency. If the alternating current impedance for each frequency is measured, whether or not the alternating current impedance is appropriate can be confirmed for two or more types of frequencies, so that the connection state of the connection cable 12 can be determined with higher accuracy.

  Furthermore, if the AC impedance for each frequency is meticulously measured, there is a possibility that a local short circuit of an electrical path constituting the vehicle-side load 52 or an electrical abnormality of an in-vehicle device constituting the load can be detected. is there. Furthermore, the rectangular wave alternating current as shown in FIG. 4 includes a wide range of frequency components from a direct current (low frequency) component to a high frequency component. If a circuit such as a radio tuning circuit is added to the impedance detection unit 28 (FIG. 3), AC impedances of various frequencies can be measured using rectangular wave AC.

  In addition, although the battery backup apparatus 1 of this example is provided with the reverse connection detection part 27, this reverse connection detection part 27 is not an essential structure. For example, when connecting to the vehicle side using a cigar plug or a dedicated connector, there is little possibility that the positive and negative are reversed. In such a case, there is little risk of trouble occurring even if the reverse connection detection unit 27 is omitted.

  As described above, specific examples of the present invention have been described in detail as in the embodiments. However, these specific examples merely disclose an example of the technology included in the scope of claims. Needless to say, the scope of the claims should not be construed as limited by the configuration, numerical values, or the like of the specific examples. The scope of the claims includes techniques in which the specific examples are variously modified, changed, or appropriately combined using known techniques and knowledge of those skilled in the art.

DESCRIPTION OF SYMBOLS 1 Battery backup apparatus 10 Power button 11A / B indicator 12 Connection cable 121 Clamp 13 Display meter 21 Electric power supply part 211 Backup battery 212 Current limiting part 23 Monitor part 231 Vehicle voltage determination part 232 Current detection amplifier 24 CPU
241 Connection determination unit 25 Output control unit 27 Reverse connection detection unit 28 Impedance detection unit 280 AC generation source 281 Voltage application unit 282 Detection unit 5 Vehicle (backup target)
51 Vehicle battery (battery)
52 Vehicle load

Claims (4)

A battery backup device that supplies power to a backup target when the battery is removed from the backup target equipped with a battery,
An impedance measurement unit for measuring electrical AC impedance to be backed up;
A connection determination unit that determines whether or not the connection state is electrically connected to the backup target using the measurement value of the AC impedance by the impedance measurement unit,
A battery backup device comprising: a power supply unit that supplies power to a backup target on condition that the connection determination unit determines that the connection state is established. In Claim 1, it has a reverse connection detection part which detects the reverse connection state where electrical positive / negative was wrongly connected to backup object,
The connection determination unit is a battery backup device that determines an incorrect connection state when a reverse connection state is detected by the reverse connection detection unit. In Claim 1 or 2, the impedance measurement unit measures two or more types of AC impedances having different frequencies,
The connection determination unit is a battery backup device that determines whether the connection state with respect to the backup target is correct by using the measured values of the two or more types of AC impedance.   The battery backup device applied to a vehicle to be backed up according to any one of claims 1 to 3, wherein the battery backup device is provided on the vehicle side or a clamp capable of holding an electrical terminal provided on the vehicle side. A battery backup device comprising a cigar plug connectable to the cigar socket and electrically connected to the vehicle via the clamp or cigar plug.

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