CN105225316A - A kind of dormancy of electron key low-power consumption power supply plan and awakening method - Google Patents

Abstract

The invention relates to a dormancy and wake-up method of a low power consumption power supply scheme for an electronic key. When the electronic key detects that its serial port is at the first level indicating that the electronic key is in an idle state, the timing module of the electronic key is started for timing. When the timing value When the set threshold is reached, the serial port pin of the electronic key is configured as an I/O port, and the I/O port is configured as an external interrupt function enable, so that the electronic key enters the sleep mode; when the electronic key is in contact with the lock, The electronic key supplies power to the lock, and the lock sends a second-level serial port handshake command to the electronic key as a start bit signal, so that the serial port pin of the electronic key generates an external interrupt, and the electronic key wakes up to the working mode. The invention can effectively reduce power consumption, prolong the standby time of the electronic key, and can realize the sleep and wake-up of the electronic key efficiently and accurately.

Description

Sleep and wake-up method of a low-power supply scheme for electronic keys

technical field

The invention relates to a low-power supply scheme for an electronic key, and relates to a low-power supply scheme using a sleep and wake-up mechanism for an electronic key powered by a built-in battery, thereby achieving lower power consumption and prolonging the standby time of the electronic key. Improve user experience.

Background technique

Currently, the electronic key is powered by a built-in battery. In order to increase user experience and facilitate portability, the electronic key is small in size. In view of the current battery technology and the space of the electronic key, the battery capacity inside the electronic key cannot be made too large. Frequent charging will greatly reduce the user experience. In order to improve the single-charge usage time of the electronic key, reducing power consumption is a better solution under the background that the battery capacity cannot be increased. In practice, the electronic key is only in the working state at the moment of unlocking, and is in the standby state most of the other time. If the electronic key is only placed in the normal working state at the moment of work, and in other standby states, it is placed in a low-power sleep state, which will greatly reduce the average power consumption of the electronic key.

However, the electronic key wakes up from the dormant state to the normal working state, and enters the dormant state from the normal working state, requiring a working mechanism. The technology used in this mechanism directly affects the time and accuracy of switching between the dormant and wake-up states. The wake-up time affects the user's experience. If the time is too long, the user's experience will be poor, which will give the user the illusion that the key is unresponsive or damaged. If the wake-up is too sensitive, it will cause frequent wake-up of the key, false wake-up, etc., and cannot better reduce the power consumption of the electronic key. Moreover, if the electronic key can accurately identify the working and standby states, and enter the dormant state in time, the power consumption of the electronic key will be greatly reduced. Therefore, the good sleep and wake-up mechanism of the electronic key can greatly reduce the normal working time of the electronic key, more accurately, efficiently and quickly enter the low-power sleep state, reduce the wake-up time, improve user experience, and reduce the cost of the electronic key. The power consumption is lower, and the use time of the electronic key for a single charge is extended under the condition of a certain battery capacity.

Therefore, how to realize the sleep and wake-up mechanism of the electronic key low power consumption power supply scheme with the above functions is an urgent problem to be solved.

Electronic keys are suitable for passive electronic locks. Passive electronic locks have the characteristics of no need for power wiring, wide application range, and multiple forms. They combine the advantages of traditional mechanical locks and modern access control systems, and perfectly shield the shortcomings of both. First of all, passive electronic locks can have traditional padlocks, door locks and other forms, which can be used to transform and replace traditional locks. At the same time, they have the traceable log function of access control systems. Benefiting from the same form as traditional locks, the cost steps and usage The same method can greatly reduce the cost of learning. Secondly, the passive electronic lock is a passive system, which does not need to arrange special power supply and communication lines, which greatly improves the flexibility of the applicable environment, and is especially suitable for remote and widely distributed areas. There is no need to maintain the cables of the access control system, and there is no need to worry about maliciously opening the access control by destroying the cables.

Contents of the invention

The present invention provides a low-power-consumption power supply scheme for electronic keys suitable for passive electronic locks, and can efficiently and accurately realize the sleep and wake-up of electronic keys, thereby realizing the purpose of energy saving and power consumption reduction.

In order to achieve the above object, the technical solution of the present invention is to provide a dormancy and wake-up method for the low power consumption power supply scheme of the electronic key. Timing is performed by the timing module. When the timing value reaches the set threshold, the serial port pin of the electronic key is configured as an I/O port, and the I/O port is configured as an external interrupt function enable, so that the electronic key enters sleep mode. model;

When the electronic key is in contact with the lock, the electronic key supplies power to the lock, and the lock sends a second-level serial port handshake command to the electronic key as a start bit signal, so that the serial port pin of the electronic key generates an external interrupt, and the electronic key wakes up to the working mode .

Preferably, the first level is a high level representing logic 1;

The second level is a low level representing logic 0.

Preferably, before dormancy, the serial port pins are configured as an I/O port with an external interrupt function of falling edge interrupt; the serial port pins of the electronic key in the dormancy mode are at the first level, and the start bit of the second level The signal generates a falling edge, and an external interrupt is generated for the serial port pin of the electronic key to wake it up.

Preferably, after waking up, the serial port pins of the electronic key are configured from the I/O port back to the serial port mode to perform serial port communication with the lock.

Preferably, the lock is a passive electronic lock, and when in contact with the electronic key, the passive electronic lock is powered by a built-in battery of the electronic key.

The present invention has the advantages of: adopting the low-power supply scheme of the sleep and wake-up mechanism of the electronic key powered by a built-in battery, before the electronic key sleeps, the serial port of the electronic key is set as a common I/O port, and the interface is enabled external interrupt function, thereby reducing power consumption. When the electronic key is in contact with the lock, the electronic key supplies power to the lock, and the lock sends a serial handshake command to the electronic key through the serial port as a start bit, and generates an external interrupt to the serial port pin of the electronic key to wake up the electronic key. The present invention realizes lower power consumption without increasing the hardware structure, prolongs the standby time of the electronic key, and improves user experience.

Description of drawings

FIG. 1 is a schematic diagram of the dormancy wake-up mechanism of the present invention.

detailed description

The invention provides a dormancy and wake-up method of a low power consumption power supply scheme for an electronic key, and the electronic key is suitable for passive electronic locks.

The method of passive electronic locks to achieve "passive" is to install a control panel similar to an access control system in the lock, and the power supply part is integrated in the electronic key, and the key that can open the lock is integrated in the electronic key. When the electronic key opens the lock, the electronic key supplies power to the lock, the lock communicates with the key, the electronic key downloads the key to the lock, and the lock judges whether the key is correct. If it is correct, it will record the key and open the door lock . Therefore, the electronic key is in a low-power sleep state when it is not in contact with the lock to provide power. When the electronic key touches the lock, it needs to wake up to the normal working state when it supplies power and communicates with the lock. After the communication between the electronic key and the lock ends, it will enter the dormant state again after leaving the lock or overtime. Therefore, the triggering condition of the electronic key's dormancy and wake-up is the start and end timeout of the communication between the electronic key and the lock.

The communication method between the electronic key and the corresponding passive lock is serial port communication. Therefore, by detecting the serial port of the electronic key, it can be judged whether the electronic key is in contact with the passive lock, whether it needs to be woken up, and whether it has completed unlocking and entered a dormant state.

The communication protocol process of the serial port is that when the serial port is in an idle state without communication, it is logic "1", that is, a high level. When communication occurs, a start bit signal is first generated. The start bit signal is a logic "0" signal, that is, a low level, indicating the start of communication transmission. After the start signal is sent, the data is transmitted according to the agreed baud rate. After the transmission is completed, it is set to a high level, which is an idle state.

According to the above-mentioned serial port communication protocol, when it is detected that the serial port is in an idle state, it starts counting, and when the time exceeds the set threshold, the electronic key is put into a dormant state. When the serial port communication is detected, the electronic key will wake up from the dormant state to the normal working state, and perform data communication with the lock.

When using the serial port wake-up mechanism, the serial port of the electronic key also needs to be in the working state, and the power consumption of the serial port is relatively high. Therefore, this power saving mode has not yet reached the lowest power consumption. Therefore, in order to further reduce the power consumption of the electronic key, in the sleep mode, the serial port of the electronic key is also put into a sleep state. At this time, the serial port can no longer wake up the electronic key, and the electronic key will not work after it goes to sleep.

After the electronic key is dormant, it also supports external interrupt wake-up. According to the communication protocol of the serial port, the serial port communication is at a high level in the idle state, and the start bit is at a low level. This process essentially produces a falling edge, which meets the conditions for external interrupt wake-up. Without increasing the hardware structure, in order to realize the function of waking up the electronic key, before the electronic key sleeps, the serial port of the electronic key is set as a normal I/O port, and the external interrupt function is enabled on this interface. When the electronic key is in contact with the lock, the electronic key supplies power to the lock, and the lock sends a serial handshake command to the electronic key through the serial port, that is, the start bit, and generates a falling edge to the serial port pin of the electronic key, generating an external interrupt, and the internal is The electronic key can be woken up.

As shown in Figure 1, the sleep and wake-up workflow of the electronic key is as follows:

Dormancy: Assume that the current electronic key is in normal working state. The electronic key monitors the serial communication. If the current key and the lock are communicating, the electronic key will continue the current work, communicate with the lock, and complete functions such as unlocking, information communication, and backup records. When the communication between the electronic key and the lock is completed, or the user leaves the key from the lock, and the serial port is detected to be at a high level, and there is no data communication between the electronic key and the lock, the electronic key internally starts the timing module. When the timing module reaches the set threshold, it will The serial port pin of the key is configured as an ordinary I/O port, and the I/O port is configured with the external interrupt function of the falling edge. At this point, the electronic key completes the work and enters the dormant mode. In sleep mode, the electronic key turns off all peripherals and enters a power-saving low-power consumption mode. Complete the hibernation process.

Wake up: Assume that the current electronic key is in a sleep mode with low power consumption and power saving. When the user uses the electronic key to contact the lock through the probe, the electronic key supplies power to the lock, and the serial port between the two is connected through the probe. The lock implements a serial port handshake with the electronic key, and sends the start bit to the electronic key. The serial port pins of the electronic key are currently configured as ordinary I/O ports, and have the external interrupt function of falling edge interrupt. In the dormant state, the pin of the serial port is at a high level, and the start bit is at a low level, that is, a falling edge is generated. At this time, the electronic key wakes up the electronic key to a normal working mode through an external interrupt. After waking up, configure the serial port pin configuration of the electronic key from the normal I/O port to the serial port mode. After the configuration is completed, the electronic key resumes the serial port function, and continues to communicate with the lock through the serial port. Complete the wakeup process.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (5)

1. the dormancy of electron key low-power consumption power supply plan and an awakening method, is characterized in that,

It is when representing that this electron key is in the first level of idle condition that electron key monitors its serial ports, the timing module starting electron key carries out timing, when clocking value reaches the threshold value of setting, the serial port pin of electron key is configured to I/O mouth, and it is enable this I/O mouth to be configured to external interrupt function, makes electron key enter park mode;

When electron key contacts with lockset, the serial ports that lockset sends second electrical level to electron key shakes hands instruction as start bit signal, makes the serial port pin of electron key produce external interrupt, electron key is waken up to mode of operation.

2. dormancy as claimed in claim 1 and awakening method, is characterized in that,

Described first level is the high level of presentation logic 1;

Described second electrical level is the low level of presentation logic 0.

3. dormancy as claimed in claim 2 and awakening method, is characterized in that,

Before dormancy, serial port pin is configured to the I/O mouth with the external interrupt function that negative edge interrupts;

The serial port pin of the electron key under park mode is the first level, produces negative edge, produce to the serial port pin of electron key the external interrupt making it wake up by the start bit signal of second electrical level.

4. dormancy as claimed in claim 1 and awakening method, is characterized in that,

After waking up, the serial port pin of electron key is configured back serial ports pattern from I/O mouth, carry out serial communication with lockset.

5., as the dormancy in claim 1 ~ 4 as described in any one and awakening method, it is characterized in that,

Lockset is passive electronic lockset, when contacting with electron key, is that passive electronic lockset is powered by the internal battery of electron key.