CN111734967A - A self-locking circuit for mobile lighting equipment and mobile lighting equipment - Google Patents

Abstract

The invention provides a self-locking circuit for mobile lighting equipment, which comprises a switch circuit and a drive circuit, wherein the drive circuit is connected with a micro control unit, the micro control unit is connected with the switch circuit, the micro control unit is connected with a magnetic induction self-locking circuit, and the micro control unit is used for detecting a self-locking signal sent by the magnetic induction self-locking circuit and locking the switch circuit. The magnetic induction self-locking circuit sends out a self-locking signal according to the magnetic field characteristic of the external environment: when the lighting equipment is placed in a specific locking environment, the magnetic induction self-locking circuit senses the specific magnetic field change of the external environment and transmits self-locking information to the micro-control unit, the micro-control unit locks the switch circuit, and the locked switch circuit cannot trigger the driving circuit to enable the mobile lighting equipment to emit light, so that the mobile lighting equipment is locked.

Description

A self-locking circuit for mobile lighting equipment and mobile lighting equipment

technical field

The invention belongs to the technical field of mobile lighting equipment, and relates to a self-locking circuit for mobile lighting equipment and mobile lighting equipment.

Background technique

Mobile lighting devices (such as flashlights) are widely used in daily life and processing because of their easy portability and easy operation. However, due to the portability of general mobile lighting equipment, users will put the equipment in a pocket or store it in other spaces with sundries. The lighting equipment is prone to contact with sundries in this space and cause false touches, making mobile lighting If the device is lit, if the user does not find it in time, it will seriously consume the power of the device, especially the mobile lighting device with high power, which may cause a fire due to excessive temperature if it is lit for a long time.

In order to solve the problem of false touches of mobile lighting equipment, the commonly used method is to lock the buttons through software. As shown in Figure 1, the general locking circuit is to unlock the buttons by a certain method of operating the button SW3 (such as long pressing) , the flashlight will be lit only after unlocking. However, this key locking method complicates the locking/unlocking circuit design, and the unlocking steps are cumbersome. When using the product, the user must read the manual in detail and learn the key locking/unlocking method, as well as memorize its use method. By long pressing the button to unlock, even when the mobile lighting device is pressed by a hard object for a long time, it can also be unlocked, which is prone to the problem of false unlocking.

Therefore, the current mobile lighting devices have the problems of complicated and cumbersome locking and unlocking methods, and a high false unlocking rate.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a self-locking circuit for mobile lighting equipment and mobile lighting equipment in view of the deficiencies of the prior art. The mobile lighting equipment can be automatically locked by placing the mobile lighting equipment in a specific environment. The device can be unlocked immediately when it is taken out of the environment. The locking key and unlocking method are simple and do not require additional learning. The operation is simple, and the probability of false unlocking is greatly reduced.

In order to achieve the above object, the present invention adopts the following technical solutions:

A self-locking circuit for mobile lighting equipment, comprising a switch circuit and a drive circuit, the drive circuit is connected with a micro-control unit, the micro-control unit is connected with the switch circuit, and the micro-control unit is connected with a magnetic induction Self-locking circuit, the micro-control unit is used for detecting the self-locking signal sent by the magnetic induction self-locking circuit and locking the switch circuit.

Preferably, the seventh pin of the micro-control unit is connected to the magnetic induction self-locking circuit, the micro-control unit detects the voltage of the seventh pin, and when the voltage of the seventh pin satisfies the locking condition , the micro-control unit locks the switch circuit.

Further, the magnetic induction self-locking circuit includes a first magnetic induction component and a second magnetic induction component, and the first magnetic induction component and the second magnetic induction group are connected in parallel.

Further, the first magnetic induction component includes a first magnetic sensor and a first resistor, and the output pin of the first magnetic sensor is connected to the first end of the first resistance; the second magnetic induction component includes a first magnetic sensor. Two magnetic sensors and a second resistor, the output pin of the second magnetic sensor is connected to the first end of the second resistor; the voltage input pin of the first magnetic sensor is connected to the voltage input tube of the second sensor pin is connected, and a reference voltage is connected to the connection between the voltage input pin of the first magnetic sensor and the voltage input pin of the second sensor, and the second end of the first resistor is connected to the second end of the second resistor. The second end is connected, and the connection between the first resistor and the second resistor is connected to the seventh pin of the micro-control unit.

Further, the magnetic induction self-locking circuit further includes a third resistor, and one end of the third resistor is connected to the connection between the voltage input pin of the first sensor and the voltage input pin of the second sensor, and is connected to the connection of the voltage input pin of the first sensor and the voltage input pin of the second sensor. The reference voltage is connected, and the other end of the third resistor is connected to the connection between the first resistor and the second resistor and is connected to the seventh pin of the micro-control unit.

Preferably, the switch circuit includes a first switch key and a second switch key, the first switch key is connected to the third pin of the micro-control unit, and the second switch key is connected to the third pin of the micro-control unit. The fourth pin is connected.

Preferably, the sixth pin of the micro-control unit is connected with the driving circuit, and the third pin of the micro-control unit is also connected with a voltage regulator circuit.

A mobile lighting device includes a lamp body, a switch button located on the lamp body, and a circuit board arranged inside the lamp body, the switch button is electrically connected to the circuit board, and the circuit board adopts any of the above In the self-locking circuit described in one solution, a magnetic sensor is connected on the circuit board.

Preferably, it includes a lamp body protective sleeve, the lamp body protective sleeve is provided with a magnet corresponding to the position of the magnetic sensor, the lamp body is put into the lamp body protective sleeve, and the magnetic sensor is placed in the lamp body protective sleeve. Under the action of the magnetic field of the magnet, the circuit board locks the switch button.

Further, the circuit board is arranged in a circular shape on the cross section of the lamp body, the magnetic sensor includes a first Hall switch and a second Hall switch, the first Hall switch is connected to the second Hall switch. Hall switches are respectively located at two ends of the diameter of the circuit board, the magnets are arranged in the lamp body protective sleeve in a ring shape, and the distance from the magnet to the bottom of the lamp body protective sleeve is the same as the distance from the circuit board to the lamp body protective sleeve. The distance between the light outlet of the lamp body is equal.

Beneficial effects of the present invention: The present invention provides a self-locking circuit for mobile lighting equipment. The micro-control unit connected with the driving circuit locks the switch circuit by detecting the self-locking signal sent by the magnetic induction self-locking circuit. The magnetic induction self-locking circuit sends out a self-locking signal according to the magnetic field characteristics of the external environment: when the lighting device is placed in a specific locking environment, the magnetic induction self-locking circuit senses the magnetic field of a certain strength of the external environment and transmits the self-locking signal to the micro-control unit. Lock information, the locked switch circuit cannot trigger the drive circuit to make the mobile lighting device emit light, so as to realize the locking of the mobile lighting device. The self-locking circuit of the present invention only needs to be placed in a specific environment to complete the locking, without Users learn complex and tedious unlocking/locking steps. The seventh pin of the micro-control unit is connected with the magnetic induction self-locking circuit, and the magnetic induction self-locking circuit uses the voltage signal as the locking signal. When the micro-control unit detects that the voltage signal of the seventh pin meets the locking condition, it controls the locking switch circuit .

The magnetic induction self-locking circuit is composed of a first magnetic induction component and a second magnetic induction component in parallel. The self-locking signal delivered. Only when the two magnetic induction components are approached by magnets at the same time, the magnetic induction self-locking circuit can satisfy the self-locking condition, preventing the occurrence of false key locking. The magnetic induction assembly includes a magnetic sensor and a resistor connected to the magnetic sensor for current limiting and voltage division in the circuit. The magnetic induction self-locking circuit also includes a third resistor, one end of the third resistor is connected to the reference voltage, and the other end is connected to the seventh pin of the micro-control unit for reducing the quiescent current.

The switch circuit includes a first switch key and a second switch key. When the circuit is in an unlocked state, as long as any one of the first switch key or the second switch key is pressed, the lighting device can be turned on. The first switch button and the second switch button are respectively connected to the micro-control unit. When the micro-control unit detects the self-locking signal, the switch circuit is locked, and even if the first switch button and/or the second switch button is pressed, it cannot be lit. equipment. The micro-control unit is also connected with a voltage-stabilizing circuit for providing the micro-control unit and the magnetic inductor supply voltage and a stable reference voltage. The sixth pin of the micro-control unit is connected with the driving circuit, and the micro-control unit controls the driving circuit to perform corresponding actions, such as starting/stopping the device.

The invention also provides a mobile device. The lamp body is provided with a circuit board for controlling the execution of the lamp body, the switch button is connected to the circuit board, and there is a magnetic sensor on the circuit board. The magnetic sensor senses the approach of a magnet and transmits a self-locking signal. To the microcontroller on the circuit board, the microcontroller locks the switch button so that no matter how the user presses the switch button, the lighting device will not be activated. The mobile lighting device is also equipped with a lamp body protection cover, and the lamp body protection cover has a magnet corresponding to the position of the magnetic sensor. When the mobile lighting device is put into the lamp body protection cover, the magnet and the magnetic sensor will approach, and the magnetic sensor will move toward the magnetic sensor. The circuit board sends a self-locking signal to realize the key locking of the mobile lighting device. The magnetic sensor includes a first Hall switch and a second Hall switch, which are respectively arranged on the circuit board and close to the inner wall of the lamp body. The two Hall switches are respectively located on the two ends of the diameter of the circular circuit board passing through the center of the circle, which can further prevent false locks. The situation of the key appears, and the magnet is arranged in the protective cover of the lamp body in a ring shape, so that the first Hall switch and the second Hall switch can be rotated at any angle in the protective cover to issue a self-locking signal under the magnetic field force of the magnet. There is no accidental unlocking in the case. Put the lamp body into the protective cover to lock the key; take out the lamp body to unlock, the operation is simple, and the protective cover also protects the lamp body shell.

Description of drawings

1 is a schematic diagram of an anti-mistouch circuit commonly used in the background technology;

Accompanying drawing 2 is the connection circuit schematic diagram of drive circuit and power supply, light-emitting diode in the present invention;

Accompanying drawing 3 is the circuit schematic diagram of the micro-control unit in the present invention;

Accompanying drawing 4 is the circuit schematic diagram of the magnetic induction self-locking circuit in the present invention;

Fig. 5 is a structural cross-sectional view of the mobile lighting device of the present invention

FIG. 6 is a partial enlarged view of A in FIG. 5 .

Identification in the figure: 1-lamp body; 3-lamp body protective cover; 101-circuit board; 102-magnetic sensor; 103-lamp body light outlet; 301-magnet; 302-lamp body protective cover bottom.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the embodiments of the present invention, unless otherwise expressly specified and limited, terms such as “installation”, “connection”, “connection”, and “fixation” should be understood in a broad sense. For example, it may be a fixed connection or a It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Referring to FIGS. 1 to 4 , this embodiment provides a self-locking circuit for a mobile lighting device, including a switch circuit and a drive circuit, the drive circuit is connected with a micro-control unit U4, and the micro-control unit U4 is connected to the The switch circuit is connected, and the micro-control unit U4 is connected with a magnetic induction self-locking circuit; the control unit U4 is used to detect the self-locking signal sent by the magnetic induction self-locking circuit and lock the switch circuit.

As shown in FIG. 1 , in this embodiment, the driving circuit includes a driver, and the driver is a DC-DC LED driver. The driving circuits are respectively connected with the power supply and the light-emitting diodes, and are used for controlling the light-emitting diodes to perform corresponding actions.

As shown in FIG. 2 , in this embodiment, the micro-control unit U4 selects a single-chip microcomputer PIC12F1822. The eighth pin GND of the micro-control unit U4 is grounded, and the first pin VDD of the micro-control unit U4 is connected to the reference voltage Vref. The voltage value of the reference voltage Vref can be any stable voltage suitable for the working range of the microcontroller unit. In this embodiment, the Vref is a stable voltage output by a low dropout linear regulator (LDO), which is also a microcontroller. In this embodiment, the reference voltage Vref connected to the micro-control unit U4 is 3V.

In this embodiment, the third pin GP4 of the micro-control unit U4 is connected to the first switch key SW1, and the other end of the first switch key SW1 is connected in series with the resistor R17 and then grounded; the fourth pin of the micro-control unit U4 The GP3 pin is connected to the second switch key SW2, and the other end of the second switch key SW2 is grounded. In this embodiment, the resistance value of the series resistor R17 is 225 ohms.

In the above embodiment, the micro-control unit U4 is used to control the locking and unlocking of the switch circuit. When the switch circuit is in the unlocked state, the first switch key SW1 and/or the second switch key SW2 are pressed down, the sixth pin of the micro-control unit U4 changes from low level to high level, the The sixth pin of the micro-control unit U4 is connected to the drive circuit, and the sixth pin of the micro-control unit U4 is set to a high level to control the drive circuit to complete the execution of the corresponding actions of the light-emitting diode, so as to realize the The lighting or brightness adjustment of the light-emitting diodes.

As shown in FIG. 2 and FIG. 3 , in this embodiment, the seventh pin GP0 of the micro-control unit U4 (referred to as the LOCK pin) is connected to the magnetic induction self-locking circuit. The micro-control unit detects the voltage of the LOCK pin, and when the voltage of the LOCK pin satisfies the locking condition, the micro-control unit locks the switch circuit.

As shown in FIG. 3 and FIG. 4 , the magnetic induction self-locking circuit includes a first magnetic induction component and a second magnetic induction component, and the first magnetic induction component and the second magnetic induction component are connected in parallel. The first magnetic induction component includes a first magnetic sensor U5 and a first resistor R16, the output pin Vout of the first magnetic sensor U5 is connected to the first end of the first resistance; the second magnetic induction component It includes a second magnetic sensor U6 and a second resistor R15, and the output pin Vout of the second magnetic sensor U6 is connected to the first end of the second resistor. The voltage input pin Vin of the first magnetic sensor U5 is connected to the voltage input pin Vin of the second sensor U6, and the voltage input pin Vin of the first magnetic sensor U5 is connected to the second sensor U6. A reference voltage Vref is connected to the connection of the voltage input pin Vin of the sensor U6, where the reference voltage Vref is also a stable voltage output by the LDO as the power supply voltage of the first magnetic sensor and the second magnetic sensor.

In this embodiment, the first sensor U5 and the second sensor U6 are both three-terminal Hall elements, including a Vin pin, a GND pin, and a Vout pin. The Vin pins of the two elements are connected, and the connection is connected to a reference voltage. The Vout pins of each element are connected in series with current limiting resistors respectively, and the connection is connected to the LOCK pin. The micro-control unit U4 detects the voltage of the LOCK pin, and judges whether the LOCK pin voltage meets the locking requirement according to the value of the LOCK pin voltage. condition, thereby locking/unlocking the switch circuit. The GND pins of the two Hall elements are connected, and the connection is grounded (the negative electrode of the battery). In this embodiment, the Hall element is powered by the Vin pin and the GND pin. When a magnet is close to the element, the Vout pin of the element will be connected to the GND pin through the internal MOS conduction. If the magnet is far away from the element, the Vout pin of the element will be connected to the GND pin. The GND pin is disconnected through the internal MOS.

As shown in FIG. 4 , the magnetic induction self-locking circuit further includes a third resistor R14, and one end of the third resistor R14 is connected to the voltage input pin Vin of the first sensor U5 and the voltage input pin Vin of the second sensor U6 The reference voltage Vref is connected to the connection of the first resistor R14, and the other end of the third resistor R14 is connected to the connection of the first resistor R16 and the second resistor R15, and is connected to the LOCK pin.

In this embodiment, the Vin pin of the Hall switch is a voltage input pin connected to the reference voltage Vref, the GND pin of the Hall switch is grounded, the Vout pin is an output pin, and a current limiting resistor is connected in series with the Vout pin After the output voltage to the LOCK pin. When there is no magnet close to the Hall switch, the GND pin and the Vout pin inside the Hall switch are disconnected, the circuit where the Hall switch is located is in an open state, and the voltage of the LOCK pin is equal to the reference voltage Vref at this time; when When a magnet is close to one of the Hall switches, the Vout pin of the Hall switch will be connected to the GND pin through the internal MOS. At this time, the circuit of the Hall switch with the magnet close to it forms a loop, and the voltage of the LOCK pin It is equal to the voltage of the reference voltage Vref divided by the resistor. That is, when there is only a magnet near the Hall switch U5, VLOCK=Vref/(R14+R16)*R16; similarly, when there is only a magnet near the Hall switch U6, VLOCK=Vref/(R14+R15 )*R15. None of the above three situations will cause the keys to lock.

When both the Hall switch U5 and the Hall switch U6 have magnets close to each other, at this time VLock=Vref/(R14+R15//R16)*(R15//R16), according to the actual reference voltage Verf of the circuit in advance and the resistance values of resistors R14, R15 and R16, calculate the determined value of Vlock under the formula VLock=Vref/(R14+R15//R16)*(R15//R16), set the determined value of Vlock within the floating range voltage value as the locking condition. In this embodiment, Vref/(R14+R15//R16)*(R15//R16)±0.2V can be used as the locking condition. When the microcontroller detects that the voltage of the LOCK pin falls into Vref/(R14+R15/ When the voltage range of /R16)*(R15//R16)±0.2V, the device meets the locking condition, and the micro-control unit controls the locking of the switch circuit. The voltage floating range used in this embodiment is ±0.1V. Of course, the floating range can also be adjusted to ±0.2V or other suitable ranges according to the resistance. The specific voltage range can be specifically adjusted according to the precision of the voltage dividing resistor.

In this embodiment, the resistance values of the first resistor R16 and the second resistor R15 can be any value greater than 200 ohms. Considering that it is a battery-powered mobile device, the lower the static power consumption, the better, so the resistance is generally set to be more than 100K , to reduce quiescent current. In this embodiment, the resistance values of the first resistor R16 and the second resistor R15 are both 470 kΩ.

In this embodiment, the resistance value of the third resistor R14 may be any value greater than 200 ohms, so as to reduce the quiescent current. In this embodiment, the resistance value of the third resistor R14 is 1 megohm.

In this embodiment, the first magnetic sensor U5 and the second magnetic sensor U6 are both Hall switches, and the model of the Hall switches is A3212. In this embodiment, the Hall switch may also be any other non-polar Hall switch.

In this embodiment, when Vref is 3V, the voltage of the LOCK pin can be 0.57V as the locking condition, that is, when the microcontroller detects that the voltage of the LOCK pin is the lock voltage of 0.57V, the switch circuit is locked. When there is no magnet near the first magnetic sensor and the second magnetic sensor, the voltage of the LOCK pin is 3V. At this time, the micro-control unit controls the mobile lighting device to be in an unlocked state, and the user presses the first button SW1 and/or SW2 can both light up the flashlight; when a magnet is close to one of the first magnetic sensor or the second magnetic sensor, the output voltage of the magnetic induction self-locking circuit is 0.96V, and the The micro-control unit detects that the voltage of the LOCK pin is 0.96V, and the mobile lighting device is still in the unlocked state; when there are magnets near the first magnetic sensor and the second magnetic sensor at the same time, the micro-control unit detects the LOCK The voltage of the pin is 0.57V, the micro-control unit locks the switch circuit, and any pressing of SW1 and/or SW2 to move the lighting device will not light up. In this embodiment, the microporous unit can also lock the switch circuit when it is detected that the voltage of the LOCK pin is within a voltage range of 0.57V±0.1V. The voltage range for judging whether to lock the switch circuit is affected by the resistance accuracy of the first resistor R16 and the second resistor R15. For example, when the voltage divider resistance is less accurate, the locked voltage range can also be set to 0.57V±0.2V.

Of course, the voltage detected by the above-mentioned LOCK pin is 3V, 0.57V, and 0.96V are only one of the examples. R14) The resistance value is different, and the locking condition (locking voltage) will also change appropriately. In this embodiment, the reference voltage may also be other stable voltages, as long as it is within the power supply voltage range of the Hall switch.

In this embodiment, by setting the two magnetic sensors U5 and U6, the mobile lighting device can be locked in a specific locking environment (magnets are provided at the positions of the two magnetic sensors U5 and U6). When the mobile lighting device is taken out from a specific magnet environment, the unlocking is completed immediately, and there is no need to learn the unlocking action. Moreover, when the keys are locked, even if any one or two keys are touched by mistake, the device cannot be turned on, which greatly reduces the false touch rate.

As shown in FIG. 2 , in this embodiment, a voltage stabilizing circuit is also connected to the third pin of the micro-control unit U4, and a voltage-stabilizing circuit is connected in series with the third pin of the micro-control unit U4. The fourth resistor R13. The voltage-stabilizing circuit is used to provide the power supply voltage of the micro-control unit and the magnetic inductor and a stable reference voltage. In this embodiment, the resistance value of the fourth resistor R13 is 470 ohms. In some embodiments, the fourth resistor R13 may also be any other value greater than 200 ohms.

As shown in FIG. 2 , in this embodiment, the voltage stabilizer circuit includes a voltage stabilizer U3, the second pin of the voltage stabilizer U3 is connected with a capacitor C13 and a capacitor C14, and the second pin of the voltage stabilizer U3 is connected to a capacitor C13 and a capacitor C14. The connection between the pin and the capacitor C14 outputs a voltage of 3V. The other end of the capacitor C14 is grounded, and the other end of the capacitor C13 is grounded. In this embodiment, the size of the capacitor C13 is 1uF, and the size of the capacitor C14 is 0.1uF.

As shown in FIG. 2 , in this embodiment, the third pin of the voltage regulator U3 is connected to a capacitor C12, the connection between the third pin of U3 and the capacitor C12 is connected to the positive electrode of the battery, and the capacitor C12 The other end of the capacitor C12 is grounded, and the size of the capacitor C12 is 1uF. In this embodiment, the first pin of the voltage regulator U3 is grounded. In this embodiment, the third pin of the voltage stabilizer U3 is also connected to the positive electrode access port of the battery. In this embodiment, the voltage regulator U3 selects BL8530. In some embodiments, the voltage regulator U3 may also be any other low dropout linear voltage regulator (LDO) whose output range is within the range of the MCU and the Hall switch. The choice of the specific voltage regulator depends on the condition of the power supply battery. If it is a lithium battery, it is not suitable to use an LDO exceeding 3V. If two lithium batteries are connected in series, it can be an LDO within 5V.

As shown in FIG. 4 , in this embodiment, a mobile lighting device is provided, including a lamp body 1, a switch button (not shown in the figure) on the lamp body, and a circuit board 101 inside the lamp body, The switch button is electrically connected to the circuit board 101, and the circuit board 101 is used to lock the switch button and control the lamp body 1 to perform corresponding actions; the circuit board 101 is the same as any of the above solutions. In the self-locking circuit described above, the magnetic sensor 102 is connected on the circuit board.

As shown in FIG. 4 , in this embodiment, the circuit board 101 is disposed on a cross section inside the lamp body. In some embodiments, the mobile lighting device can be a flashlight, and the flashlight is usually cylindrical, and the circuit board 101 is circular in the cross section of the flashlight. In this embodiment, the magnetic sensor 102 includes a first Hall switch and a second Hall switch, and the first Hall switch and the second Hall switch are respectively attached to the circuit board and close to the inner wall of the lamp body. In some embodiments, the two Hall switches may also be nearby. In this embodiment, the first Hall switch and the second Hall switch are symmetrically arranged on the circuit board 101 along the central axis of the lamp body, and the first Hall switch and the second Hall switch are arranged symmetrically along the central axis of the lamp body. The Hall switches are respectively located at both ends of the diameter of the circuit board, the connection line between the first Hall switch and the second Hall switch passes through the center of the circle, and the angle between the two elements is 180 degrees, which are in two relatively symmetrical positions. Position, the distance between the two Hall switches is the farthest. This position design enables the two Hall switches to sense the magnetic field changes brought by different directions. During use, even if there are other devices close to the flashlight, only one of the Hall switches will be used. One switch experiences a voltage change, while the other is unaffected, avoiding false key locks due to the proximity of devices with magnets in the use environment. In this embodiment, the switch button (not shown in the figure) is arranged on the side of the lamp body. In this embodiment, the mobile lighting device is provided with two switch buttons, which are respectively provided on the side and the bottom of the device. In some embodiments, the two switch buttons can also be arranged on other positions of the device.

In this embodiment, the mobile lighting device further includes a lamp body protective cover 3 , and the lamp body protective cover 3 is provided with a magnet 301 corresponding to the position of the magnetic sensor 102 . When the lamp body 1 is put into the lamp body protective cover 3 , the magnetic sensor 102 in the lamp body 1 is close to the magnet 301 in the lamp body protective cover 3 , and the magnetic sensor 102 is in the magnet 301 . Under the action of the magnetic field, a lock signal is issued, and the circuit board 101 locks the switch button. At this time, no matter external contact or pressing any button of the flashlight, the flashlight will not be lit. Moreover, the mobile lighting device provided by the present invention can be locked only by putting the lighting device into a special protective cover, and the flashlight can be unlocked and used by taking out the flashlight from the protective cover. The sleeve itself can also protect the lamp body shell to a certain extent.

In this embodiment, the magnet 301 is arranged in the lamp body protective cover 3 in a ring shape. The thickness of the magnet depends on the position of the magnet. The thickness of the magnet is large and the fault tolerance is strong. The corresponding magnetic sensor on the device can be sensed. In this embodiment, the distance from the magnet 301 to the bottom 302 of the lamp body protective cover is equal to the distance from the magnetic sensor 102 to the light outlet 103 of the lamp body. Put the light outlet of the lamp body toward the bottom of the protective cover. The height of the magnet 301 is the same as the height of the magnetic inductor 102. The magnet 301 is arranged in a ring shape, and the lamp body 1 rotates in the protective cover 3 at any angle. All will be affected by the magnetic field of the magnet 102, and the switch button will always be locked. The lamp body 1 can be unlocked by taking it out of the lamp body protective cover 3, and only one of the first Hall switch and the second Hall switch after taking out has a magnet close to it, which will not cause the flashlight to enter the locked state. , realizes that the lamp body is only in the locked state in the protective cover, and other conditions are unlocked, even if the magnets of other devices are nearby, the key will not be locked, which reduces the probability of mis-locking the key.

In this embodiment, the magnetization of the magnet 302 is mirror magnetization: magnetization is performed on the arc surface of the ring magnet, after magnetization, the inner and outer arc surfaces of the ring magnet are magnetically strong, and the upper and lower circular surfaces are weak. The magnets are permanent magnets. In some embodiments, the magnet can also be a plurality of magnets, and the magnets can be placed in a circle around a designated position of the protective sleeve.

The above-mentioned embodiment is only one of the preferred specific modes of the present invention, and the usual changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A self-locking circuit for a mobile lighting device, characterized in that it comprises a switch circuit and a drive circuit, the drive circuit is connected with a micro-control unit, the micro-control unit is connected with the switch circuit, and the micro-control unit is connected to the switch circuit. The control unit is connected with a magnetic induction self-locking circuit, and the micro-control unit is used for detecting the self-locking signal sent by the magnetic induction self-locking circuit and locking the switch circuit. 2. The self-locking circuit for mobile lighting equipment according to claim 1, wherein the seventh pin of the micro-control unit is connected to the magnetic induction self-locking circuit, and the micro-control unit detects the The voltage of the seventh pin, when the voltage of the seventh pin satisfies the locking condition, the micro-control unit locks the switch circuit. 3. The self-locking circuit for mobile lighting equipment according to claim 2, wherein the magnetic induction self-locking circuit comprises a first magnetic induction component and a second magnetic induction component, the first magnetic induction component and The second magnetic induction groups are connected in parallel. 4 . The self-locking circuit for a mobile lighting device according to claim 3 , wherein the first magnetic induction component comprises a first magnetic sensor and a first resistor, and the output pin of the first magnetic sensor is connected to the the first end of the first resistor is connected to the first end; the second magnetic induction component includes a second magnetic sensor and a second resistor, the output pin of the second magnetic sensor is connected to the first end of the second resistor; the The voltage input pin of the first magnetic sensor is connected with the voltage input pin of the second sensor, and the connection between the voltage input pin of the first magnetic sensor and the voltage input pin of the second sensor is connected with a Reference voltage, the second end of the first resistor is connected to the second end of the second resistor, and the connection between the first resistor and the second resistor is connected to the seventh pin of the micro-control unit . 5 . The self-locking circuit for mobile lighting equipment according to claim 4 , wherein the magnetic induction self-locking circuit further comprises a third resistor, and one end of the third resistor is connected to the voltage of the first sensor. 6 . The connection between the input pin and the voltage input pin of the second sensor is connected to the reference voltage, and the other end of the third resistor is connected to the connection between the first resistor and the second resistor in parallel into the seventh pin of the micro-control unit. 6 . The self-locking circuit for a mobile lighting device according to claim 1 , wherein the switch circuit comprises a first switch key and a second switch key, the first switch key and the micro-control unit’s The third pin is connected, and the second switch key is connected with the fourth pin of the micro-control unit. 7. The self-locking circuit for mobile lighting equipment according to claim 1, the sixth pin of the micro-control unit is connected with the drive circuit, and the third pin of the micro-control unit is also connected with a voltage regulator circuit. 8. A mobile lighting device, characterized in that it comprises a lamp body, a switch button located on the lamp body, and a circuit board arranged inside the lamp body, wherein the switch button is electrically connected to the circuit board, so that the The circuit board adopts the self-locking circuit according to any one of claims 1-7, and a magnetic sensor is connected on the circuit board. 9 . The mobile lighting device according to claim 8 , characterized in that it comprises a lamp body protective cover, the lamp body protective cover is provided with a magnet corresponding to the position of the magnetic sensor, and the lamp body is placed in the In the lamp body protective cover, the magnetic sensor reacts under the action of the magnetic field of the magnet, and the circuit board locks the switch button. 10 . The mobile lighting device according to claim 9 , wherein the circuit board is arranged in a circular shape on the cross section of the lamp body, and the magnetic sensor comprises a first Hall switch and a second Hall switch 10 . The first Hall switch and the second Hall switch are respectively located at two ends of the diameter of the circuit board, the magnet is arranged in a ring shape in the protective cover of the lamp body, The distance from the bottom of the lamp body protective sleeve is equal to the distance from the circuit board to the light outlet of the lamp body.

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