JP2518374Y2 - Card lock device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention uses a battery as a power source and is powered on by inserting a dedicated card into a card insertion slot to unlock electric locks on doors and various terminal devices. Regarding a card lock device.

[0002]

2. Description of the Related Art In order to prevent an outsider or an unspecified number of people from entering, for example, an electric lock such as a door of a guest room of a hotel or a door of a laboratory is unlocked for the first time by using a dedicated card. Card lock devices are widely known. Similarly, there is also known a card lock device that unlocks various terminal devices by using a dedicated card and enables them to operate.

In such a card lock device, when a battery is used as a power source, it is determined that the battery has reached the end of its service life when the battery voltage drops to a predetermined voltage, and the battery is replaced.

By the way, the battery life of, for example, about one year to one and a half years under normal use may be abnormally shortened for some reason. Therefore, a counter is provided to count the number of times the card is inserted into the card insertion slot, that is, the number of times the power is turned on when the card is inserted. When the count reached by this counter is considerably smaller than the reference value, It was judged that there was something wrong with the device, the battery that had reached the end of its life was replaced with a new battery, the counter was cleared, and the power-on counting operation was performed again in the same manner as above.

[0005]

However, in the above-mentioned conventional apparatus, the counter has to be cleared by manual operation of an operator or by data input, which is a disadvantage of complicated operation.

An object of the present invention is to provide a card lock device capable of automatically clearing a counter by battery replacement by utilizing the phenomenon that the power supply voltage returns to a predetermined initial voltage when the battery is replaced. .

[0007]

To achieve the above object, in the present invention, a voltage detector for detecting a voltage applied from a battery, and a voltage that is backed up via the electrostatic capacity by the battery, The detection voltage storage unit that stores the detection voltage at the current power-on and the detection voltage at the previous power-on obtained from the detection unit, the reference voltage difference storage unit that sets the reference voltage difference, and the And a calculation unit that calculates the difference between the present detection voltage and the previous detection voltage of the voltage storage unit, and the calculation result and the reference voltage difference stored in the reference voltage difference storage unit are compared, and the calculation result is the reference voltage. When the difference is larger than the difference, a comparison unit is provided for outputting, and the count value of the counter is cleared by the output of the comparison unit.

[0008]

[Function] When the battery is replaced, if the detected voltage at the subsequent power-on (current detected voltage) and the detected voltage at the previous power-on (previous detected voltage) have a predetermined voltage difference, The count value of the counter is automatically cleared. The counter will not be cleared unless a new battery is loaded in place of the exhausted battery.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram schematically showing the construction of a card lock device according to an embodiment of the present invention. In the figure, reference numeral 1 is a battery, for example, which is an AA battery with a predetermined initial voltage set to 6 V, 2 is a switch that is turned on by inserting a dedicated card (not shown), and 3 is a power source of the battery 1 when the switch 2 is turned on Is a CPU supplied. Reference numeral 4 denotes a RAM, which is a current detection voltage storage unit 41 and a previous detection voltage storage unit 4
And 2. In addition, even if the switch 2 is not turned on by inserting the dedicated card, that is, unlocking the electric lock
Even when the locking operation is not performed, power is directly supplied from the battery 1 to continue the storage operation, and when the battery 1 is temporarily removed for replacement, the storage capacity is changed by, for example, a capacitor. It is designed to hold the contents. 5 is R
OM, which stores the control program for the electric lock, and which determines the battery has reached the end of its life (lifetime voltage),
For example, a reference voltage storage unit 51 that stores a reference voltage set to 4.6V, and a reference voltage that is set as a reference voltage difference between the initial voltage of the new battery and the life voltage, for example, 1.4V. And a difference storage unit 52. CP
U3 includes a voltage detection unit 31, a storage control unit 32, a calculation unit 33, a first comparison unit 34A, a second comparison unit 34B, a display control unit 35, a counter 36, and an electric lock control unit 37. have. The voltage detection unit 31 detects the voltage applied from the battery 1 to the electrical operation unit of the card lock device based on the digital signal input from the AD converter 6 via the switch 2 that is turned on. The storage control unit 32 stores the detection voltage value obtained by the voltage detection unit 31 at the time of power-on (when the switch 2 is turned on) in the present detection voltage storage unit 41 of the RAM 4, and immediately before that, the present detection voltage storage unit 41. Transfer the detection voltage stored in the previous time to the detection voltage storage unit 42,
Immediately before that, the previous detection voltage stored in the previous detection voltage storage unit 42 is replaced. Every time the power is turned on, the calculation unit 33 obtains a detection voltage difference between the present detection voltage stored in the present detection voltage storage unit 41 and the previous detection voltage stored in the previous detection voltage storage unit 42, and the value is obtained. The first comparison unit 34
Give to A. The first comparison unit 34A compares the detected voltage difference given from the calculation unit with the reference voltage difference read from the reference voltage difference storage unit 51 of the ROM 5. Then, when the detected voltage difference is the reference voltage difference, that is, 1.4 V or more as an example, the first comparison unit 34A outputs. The output is used as a control signal for clearing the counter 36. When the second comparison unit 34B receives the current detection voltage, the second comparison unit 34B compares it with the reference voltage read from the reference voltage storage unit 51 of the ROM 5, that is, 4.6 V as an example, and the voltage is smaller than the current detection voltage. When it is determined that
Input to the display control unit 35. Based on this, the display control unit 35 causes the display 7 to display a character or symbol indicating that the battery has reached the end of its life, and prompts replacement of the battery. The display 7 displays a replacement request for the battery 1 and a battery exhaustion abnormality display. The counter 36 counts the number of times each time the power is turned on, and the count value is displayed on the display 7 for displaying or determining the exhausted state of the battery. Based on the output of the second comparison unit 34B when the current detection voltage is greater than 4.6V, the electric lock control unit 37 gives an unlock control signal to the electric lock 8 to open the door (not shown). Unlock and allow the door to open. When the present invention is applied to the unlocking of various terminals, the electric lock 8 replaces the actuator for releasing the lock and enables the operation of the terminal. Reference numeral 9 denotes a data input device that is connected to or separated from the CPU 3, has an independent power supply, and supplies auxiliary power to the CPU 3 when connected to the CPU 3 with a connector. Further, the data input device 9 stores set data such as a hotel room number, a calendar, and an unlocking time when the card lock is unlocked.
It has a function to record the entry (unlocked date) when the lock is released and the occurrence of an error. Therefore, the data input device is used as an external power source in the inoperable state when the battery is down.

FIG. 2 shows a consumption characteristic diagram of the battery 1. The vertical axis represents voltage V, and the horizontal axis represents time T. In this embodiment, the initial voltage is set to 6V, the low detection voltage (voltage for judging that the battery has reached the end of its life) is 4.6V, and the down detection voltage (minimum operating voltage) is set to 4.3V. 6 to 4.6 V is an average operating voltage, and a life of 1.5 years is usually guaranteed.

In this embodiment, each time the power is turned on at the timing of T ₁ , T ₂ , T _3, ..., The voltage value of the battery 1 at that time is recorded in the present detected voltage storage section 41 of the RAM 4,
At the timing of n, when the initial voltage drops by 1.4 V and the life voltage reaches 4.6 V, the display control unit 35 reaches the display unit 7 at the time of battery replacement based on the output of the second comparison unit 34B. Display a warning to that effect.

As a result, the operator can see Ta in FIG.
When the battery 1 is replaced at the time of, the predetermined card is inserted and the switch 2 is turned on, the voltage detection unit 3 again gives the CPU 3 the data of the initial voltage of 6V. When the battery 1 is replaced, when the voltage of the battery 1 is 6V and there is at least 1.4V difference from the voltage (previous detection voltage) at the time of previous power-on (Tn). Is cleared by the output of the first comparison unit 34A. After that, every time you power on,
The counter 36 is adapted to perform the counting operation as described above.

In addition, when the battery voltage drops by 1.4 V from the initial voltage of 6 V and the battery 1 reaches the end of its life, the display 7
If the value of the number of times of power-on Tn displayed in is close to the reference value, the user of the card lock device can determine that the degree of battery consumption is normal, but the number of times of power-on is extremely small. If something goes wrong with the device,
It can be determined that the power consumption loss of the battery has occurred. When the data input device 9 is connected in this state,
The power loss of the battery is displayed on this. Then, maintenance can be performed according to this display.

According to the above embodiment, the counter is automatically cleared when the battery is replaced with a new one after the replacement request is displayed on the display 7 due to the life of the battery. Therefore, if you forget to manually clear the counter as in the past, you can erroneously judge that the new battery that was just replaced is an old battery based on the count value, and prevent uneconomical actions such as re-exchange. .

[0016]

As described above, according to the present invention,
Each time the power is turned on, the voltage of the battery in use is captured as the current detection voltage, the difference between this and the previous detection voltage is compared with the reference voltage difference, and when the former is larger than the reference voltage difference, the number of times the power is turned on is counted. Since the count value of the counter is cleared, the counter is automatically cleared when the battery which has reached the end of life voltage is replaced with a new battery. Therefore, it is possible to simplify the work at the time of battery replacement and prevent premature battery replacement due to forgetting operation when the conventional counter is cleared by manual operation.

[Brief description of drawings]

FIG. 1 is a block diagram of a card lock device according to an embodiment of the present invention.

FIG. 2 is a battery consumption characteristic diagram.

[Explanation of symbols]

 1 Battery 2 Switch 3 Voltage Detection Section 4 RAM 41 Current Detection Voltage Storage Section 42 Previous Detection Voltage Storage Section 5 ROM 51 Reference Voltage Storage Section 52 Reference Voltage Difference Storage Section 6 CPU 7 Indicator 8 Electric Lock

Claims (2)

(57) [Scope of utility model registration request] 1. A card lock device comprising a replaceable battery (1) as a power source and a counter (36) for counting the number of times the power is turned on by inserting a dedicated card into a card insertion slot. Voltage detection unit (3
1) and a detection voltage storage unit (41, 42) that stores the detection voltage at the current power-on and the detection voltage at the previous power-on, which are backed up by the battery via the electrostatic capacity and are obtained from the voltage detection unit. ), A reference voltage difference storage unit (52) in which a reference voltage difference is set, and a calculation unit (33) that calculates the difference between the current detection voltage and the previous detection voltage of the voltage storage unit each time the power is turned on. , Comparing the calculation result with the reference voltage difference stored in the reference voltage difference storage unit, and when the calculation result is larger than the reference voltage difference,
A card lock device comprising: a comparison unit (34A) for outputting, wherein the count value of the counter is cleared by the output of the comparison unit. 2. The card lock device according to claim 1, wherein the counter is a soft counter formed by a CPU.