CN217985485U - Backlight control device and intelligent door lock - Google Patents

Abstract

The embodiment of the application discloses backlight control device and intelligent door lock. The device comprises: the object sensing module is connected with the control module and used for outputting a first level signal to the control module when a moving object is sensed; the photosensitive module is connected with the control module and is used for outputting a second level signal to the control module according to the ambient brightness; the control module is used for being connected with a backlight lamp, and the control module is used for outputting a third level signal based on the first level signal and the second level signal so as to control the backlight lamp to be turned on or turned off. By the method, the object sensing module and the photosensitive module are added in the backlight control device, so that the backlight control device can control the on or off of the backlight according to the level signals output by the object sensing module and the photosensitive module respectively, the time for lighting the backlight is reduced, and the power consumption caused by the backlight is reduced.

Description

Backlight control device and intelligent door lock

Technical Field

The utility model belongs to intelligence lock field, concretely relates to backlight controlling means and intelligent lock.

Background

In some cases, the smart door lock may be installed in a location where the environment is dark, for example, a hallway. In addition, in order to enable the intelligent door lock to be installed in a dark place, a user can easily see the keys arranged on the intelligent door lock, and a backlight lamp is added to the keys of the intelligent door lock. However, the associated backlight of the smart door lock may result in higher power consumption.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present application provides a backlight control device and an intelligent door lock to improve the above problems.

In a first aspect, the present application provides a backlight control device disposed on an intelligent door lock, the device including: the object sensing module is connected with the control module and used for outputting a first level signal to the control module when a moving object is sensed; the photosensitive module is connected with the control module and is used for outputting a second level signal to the control module according to the ambient brightness; the control module is used for being connected with a backlight lamp and outputting a third level signal based on the first level signal and the second level signal so as to control the backlight lamp to be turned on or turned off.

Optionally, the photosensitive module includes a photosensitive module and a voltage stabilizing module; the light sensing module is connected with the voltage stabilizing module, and is used for outputting a voltage signal representing the ambient brightness to the voltage stabilizing module, and the voltage stabilizing module is used for stabilizing the voltage signal; the voltage stabilizing module is connected with the control module and used for outputting a second level signal to the control module based on the voltage signal representing the ambient brightness.

Optionally, the photosensitive module further comprises a delay circuit; the delay circuit is connected between the light sensing module and the voltage stabilizing module, and is configured to receive the voltage signal representing the ambient brightness output by the light sensing module and delay a preset time to output the voltage signal representing the ambient brightness to the voltage stabilizing module.

Optionally, the voltage stabilizing module includes an operational amplifier buffer circuit and a smith trigger circuit; the operational amplifier buffer circuit is connected with the Smith trigger circuit and is used for outputting a stable voltage signal to the Smith trigger circuit; the Smith trigger circuit is connected between the delay circuit and the control module, and is used for outputting the second level signal to the control module based on the voltage signal representing the ambient brightness and the stable voltage signal.

Optionally, the light sensing module comprises a light sensitive sensor and a first resistor; the delay circuit comprises a second resistor and a first capacitor; the Smith trigger circuit comprises a first amplifier, a third resistor and a fourth resistor; the operational amplifier buffer circuit comprises a second amplifier, a second capacitor, a fifth resistor, a sixth resistor and a seventh resistor; the first end of the photosensitive sensor is connected with the first end of the first resistor, the second end of the photosensitive sensor is grounded, and the second end of the first resistor is connected with a power supply; a first end of the second resistor is connected with a first end of the photosensitive sensor, and a second end of the second resistor is connected with a first input end of the first amplifier; the first end of the first capacitor is grounded, and the second end of the first capacitor is connected with the second end of the second resistor; the second input end of the first amplifier is connected with the first end of the third resistor, the output end of the first amplifier is connected with the control module, and the second end of the third resistor is connected with the control module; a first end of the fourth resistor is connected with a first end of the third resistor, and a second end of the fourth resistor is connected with an output end of the second amplifier; a first input end of the second amplifier is connected with a first end of the fifth resistor, and a second input end of the second amplifier is connected with a second end of the fourth resistor; the first end of the second capacitor is grounded, and the second end of the second capacitor is connected with the first end of the fifth resistor; the first end of the fifth resistor is connected with the first end of the sixth resistor, and the second end of the sixth resistor is grounded; and the first end of the seventh resistor is connected with the second end of the fifth resistor, and the second end of the seventh resistor is grounded.

Optionally, the smith trigger circuit is configured to output a second level signal representing a first specified level to the control module when the voltage signal representing the ambient brightness is greater than a first threshold voltage signal; the smith trigger circuit is configured to output a second level signal representing a second specified level to the control module when the voltage signal representing the ambient brightness is smaller than a second threshold voltage signal, the second threshold voltage signal is smaller than the first threshold voltage signal, and the first specified level and the second specified level are different; the smith trigger circuit is configured to output a second level signal representing a level that is the same as a level at a previous time to the control module when the voltage signal representing the ambient brightness is greater than the second threshold voltage signal and the voltage signal representing the ambient brightness is less than the first threshold voltage signal, where the previous time is a time when the smith trigger circuit last acquired that the voltage signal representing the ambient brightness changes.

Optionally, the control module is configured to output a third level signal representing a fourth specified level to light the backlight lamp when the first level signal is a level signal representing a third specified level and the second level signal is a level signal representing a third specified level; the control module is configured to control to output a third level signal representing a third designated level to turn off the backlight when at least one of the first level signal and the second level signal is a level signal representing a fourth designated level, where the third designated level is different from the fourth designated level.

Optionally, the control module comprises a nand gate; the first input end of the NAND gate is connected with the object sensing module and used for receiving a first level signal output by the object sensing module; the second input end of the NAND gate is connected with the photosensitive module and used for receiving a second level signal output by the photosensitive module; and the output end of the NAND gate is connected with the backlight lamp and used for outputting a third level signal based on the first level signal and the second level signal so as to control the on or off of the backlight lamp.

Optionally, the control module comprises an and gate; the first input end of the AND gate is connected with the object sensing module and used for receiving a first level signal output by the object sensing module; the second input end of the AND gate is connected with the photosensitive module and used for receiving a second level signal output by the photosensitive module; and the output end of the AND gate is connected with the backlight lamp and used for outputting a third level signal based on the first level signal and the second level signal so as to control the turning on or off of the backlight lamp.

Optionally, the apparatus further comprises a backlight control switch for generating a signal for controlling the backlight to be turned on or off based on the third level signal and a voltage signal output by the power supply.

Optionally, the control module comprises a single chip microcomputer; the single chip microcomputer is used for outputting a third level signal based on the first level signal and the second level signal so as to control the on or off of the backlight lamp.

In a second aspect, the present application provides an intelligent door lock comprising a backlight and a backlight control device as claimed, the backlight being connected to the backlight control device.

Optionally, a silk-screen pattern is arranged on a panel of the intelligent door lock, where the position corresponds to the backlight, and the silk-screen pattern is used to determine the position of the backlight when the backlight is in an off state.

The utility model provides a backlight control device and intelligent lock, the device includes object response module, be connected with control module, response module is used for when sensing the object, to the first level signal of control module output, photosensitive module, be connected with control module, photosensitive module is used for exporting second level signal to control module according to ambient brightness, control module, be connected with the backlight, control module is used for based on first level signal and the output of second level signal third level signal of second level signal, with the lighting or closing of control backlight.

By the method, the object sensing module and the photosensitive module are added in the backlight control device, so that the backlight control device can control the on or off of the backlight according to the level signals output by the object sensing module and the photosensitive module respectively, the time for lighting the backlight is reduced, and the power consumption caused by the backlight is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a block diagram illustrating a structure of a backlight control apparatus according to an embodiment of the present application;

fig. 2 is a block diagram illustrating a structure of a backlight control apparatus according to an embodiment of the present application;

fig. 3 is a block diagram showing a structure of a backlight control apparatus according to another embodiment of the present application;

fig. 4 is a block diagram showing a structure of a backlight control apparatus according to still another embodiment of the present application;

fig. 5 is a circuit diagram of a backlight control apparatus according to still another embodiment of the present application;

FIG. 6 is a schematic diagram illustrating a mode switching scenario according to yet another embodiment of the present application;

fig. 7 shows a structural block diagram of an intelligent door lock according to an embodiment of the present application.

Icon: 100-backlight control means; 110-an object sensing module; 120-a photosensitive module; 130-a control module; 200-backlight; 140-backlight control switch; 150-a power supply; 121-a light sensing module; 122-a delay circuit; 123-a voltage stabilizing module; 1231-smith trigger circuit; 1232-op-amp buffer circuitry; 300-Intelligent door lock.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In some cases, the smart door lock may be installed in a location where the environment is dark, for example, a hallway. In addition, in order to enable the user to easily see the keys arranged on the intelligent door lock when the intelligent door lock is installed in a dark environment, a backlight lamp is added to the keys of the intelligent door lock. However, the associated backlight of the smart door lock may result in higher power consumption.

In order to solve the above problems, the inventors have long studied and proposed that in the embodiment of the present application, there is provided a backlight control device 100 as shown in fig. 1, the backlight control device 100 is connected to a backlight 200, and the backlight control device 100 controls turning on and off of the backlight 200.

Specifically, with continued reference to fig. 1, the backlight control apparatus 100 includes: an object sensing module 110, a photosensitive module 120, and a control module 130.

The object sensing module 110 is connected to the control module 130, the photosensitive module 120 is connected to the control module 130, and the control module 130 is connected to the backlight 200.

The object sensing module 110 is mainly used for outputting a first level signal to the control module 130 when a moving object is sensed. The object sensing module 110 may be a human body sensing module, and the human body sensing module may be any one of a PIR human body sensing sensor, an ultrasonic human body sensing sensor, an infrared human body sensing sensor, a radar, and the like. For example, if the object sensing module 110 is an ultrasonic human body sensing sensor, when the ultrasonic human body sensing sensor detects a person, the ultrasonic sensor may send a first level signal to the control module, where the first level signal may be a signal indicating that the person is approaching, and for example, the first level signal may be a level signal indicating a high level or a low level. Optionally, the object sensing module 110 may be a PIR human body sensing sensor of SI-PIR-MD-01-L, 203C-DO, or the like.

The photosensitive module 120 is mainly used for outputting a second level signal to the control module 130 according to the detected ambient brightness. The photosensitive module 120 may include a sensor, such as a photosensitive sensor, an illumination sensor, or the like, which can acquire ambient brightness. Likewise, the second level signal may also be a level signal representing a high level or a low level. In one embodiment, the light sensing module 120 may output a second level signal to the control module 130 after detecting that the ambient brightness satisfies the preset condition. The preset condition may be a preset environment brightness value, or a voltage signal representing the preset environment brightness value. When the preset condition is a voltage signal representing a preset ambient brightness value, the photosensitive module 120 may convert the ambient brightness into the voltage signal after detecting the ambient brightness, compare the voltage signal corresponding to the currently detected ambient brightness with the preset condition, and output a second level signal to the control module 130 after determining that the current ambient brightness satisfies the preset condition.

The control module 130 is mainly configured to receive the first level signal output by the object sensing module 110 and the second level signal output by the photosensitive module 120, and output a corresponding third level signal based on the first level signal and the second level signal to control to turn on or turn off the backlight 200. Illustratively, when the first level signal is a level signal indicating a person and the second level signal is a level signal indicating that the ambient brightness satisfies a predetermined condition, a third level signal indicating that the backlight 200 is turned on is output, and the backlight 200 is turned on based on the third level signal indicating that the backlight 200 is turned on.

In the backlight control device provided in the embodiment of the application, by adding the object sensing module and the photosensitive module in the backlight control device in the manner described above, the backlight control device can control the on/off of the backlight according to the level signals output by the object sensing module and the photosensitive module, so that the time for lighting the backlight is reduced, and the power consumption caused by the backlight is reduced.

Optionally, fig. 2 shows a schematic diagram of a backlight control device provided in another embodiment of the present application, and referring to fig. 2, the backlight control device 100 further includes a backlight control switch 140 and a power supply 150.

The backlight control switch 140 is connected between the control module 130 and the backlight 200, and the backlight control switch 140 is further connected to the power supply 150.

In one embodiment, the backlight control switch 140 is mainly used for generating a signal for controlling the turning on or off of the backlight 200 based on the third level signal output by the control module 130 and the voltage signal output by the power supply 150. For example, when the third level signal output by the control module 130 is a level signal indicating a low level, the third level signal indicating the low level and the voltage signal indicating a high level output by the power source 150 generate a voltage difference, and the backlight control switch 140 may generate a signal for controlling the backlight 200 to be turned on; when the third level signal outputted by the control module 130 is a level signal representing a high level, the level of the third level signal representing the high level is the same as the level of the voltage signal representing the high level outputted by the power supply 150, and no voltage difference is generated, so that the backlight control switch 140 may generate a signal for controlling the backlight 200 to be turned off.

Alternatively, the backlight control switch 140 may be a P-channel enhancement mode fet. The P-channel enhancement mode field effect transistor may include a source, a gate, and a drain. In one embodiment, the gate of the P-channel enhancement mode fet is connected to the control module 130, the source of the P-channel enhancement mode fet is connected to the power supply 150, and the drain of the P-channel enhancement mode fet is connected to the backlight 200.

Optionally, the control module 130 may be a nand gate logic circuit, and a first input end of the nand gate is connected to the object sensing module 110 and is configured to receive the first level signal output by the object sensing module 110; a second input end of the nand gate is connected to the light sensing module 120, and is configured to receive the second level signal output by the light sensing module 120; the output end of the nand gate is connected to the backlight 200, and is used for outputting a third level signal based on the first level signal and the second level signal to control the backlight 200 to be turned on or off. Alternatively, the nand gates may be two-input nand gates of model 7408, 7409, CD4081, 74ALS 01.

Optionally, the control module 130 may also be an and gate logic circuit, where a first input end of the and gate is connected to the object sensing module 110 and is configured to receive the first level signal output by the object sensing module 110; the second input end of the nand gate is connected to the photosensitive module 120, and is configured to receive the second level signal output by the photosensitive module 120; the output end of the nand gate is connected to the backlight 200, and is used for outputting a third level signal based on the first level signal and the second level signal to control the backlight 200 to be turned on or off. Optionally, the and gate may be a 4081, 74ALS08 model two-input and gate.

When the control module 130 is a nand gate logic circuit, the control module 130 is specifically configured to output a third level signal representing a fourth specified level when the first level signal is a level signal representing a third specified level and the second level signal is a level signal representing a third specified level, so as to light the backlight 200, where the third specified level is different from the fourth specified level. For example, the third designated level may be a high level, and the fourth designated level may be a low level; or the third designated level may be a low level and the fourth designated level may be a high level. When the object sensing module 110 detects an object, the object sensing module 110 outputs a first level signal representing a high level, and when the ambient brightness detected by the photo sensing module 120 is low, the photo sensing module 120 outputs a second level signal representing a high level, and the control module 130 outputs a third level signal representing a low level to turn on the backlight 200.

As another embodiment, the control module 130 is specifically configured to output a third level signal representing a third designated level to turn off the backlight 200 when at least one of the first level signal and the second level signal is a level signal representing a fourth designated level. Specifically, the condition that at least one of the first level signal and the second level signal is a level signal representing a low level may include the following: the first level signal is a level signal representing a low level, and the second level signal is a level signal representing a high level; the first level signal is a level signal representing a low level, and the second level signal is a level signal representing a low level; the first level signal is a level signal indicative of a high level and the second level signal is a level signal indicative of a low level. In the above case, the control module 130 controls to output the third level signal representing the high level.

When the control module 130 is an and logic circuit, the control module 130 is specifically configured to output a third level signal representing a third designated level when the first level signal is a level signal representing the third designated level and the second level signal is a level signal representing the third designated level, so as to turn off the backlight 200. Illustratively, the third designated level may be a high level. When the object sensing module 110 detects an object, the object sensing module 110 outputs a first level signal representing a high level, and when the ambient brightness detected by the photo sensing module 120 is low, the photo sensing module 120 outputs a second level signal representing a high level, and the control module 130 outputs a third level signal representing a high level to turn off the backlight 200.

As another embodiment, the control module 130 is specifically configured to output a third level signal representing a fourth designated level to light the backlight 200 when at least one of the first level signal and the second level signal is a level signal representing the fourth designated level. Specifically, the condition that at least one of the first level signal and the second level signal is a level signal representing a low level may include the following: the first level signal is a level signal representing a low level, and the second level signal is a level signal representing a high level; the first level signal is a level signal representing a low level, and the second level signal is a level signal representing a low level; the first level signal is a level signal indicative of a high level and the second level signal is a level signal indicative of a low level. In the above case, the control module 130 controls to output the third level signal representing the low level.

In the backlight control device provided in the embodiment of the present application, by adding the object sensing module, the photosensitive module and the backlight control switch to the backlight control device in the manner described above, the backlight control switch can generate a corresponding level signal to control the on/off of the backlight according to the level signals output by the object sensing module and the photosensitive module, so as to reduce the time for lighting the backlight and reduce the power consumption caused by the backlight.

Optionally, fig. 3 is a schematic diagram of a backlight control device according to another embodiment of the present application, please refer to fig. 3, and the control module 130 may also be a single chip microcomputer. The first external fracture of the single chip is connected with the object sensing module 110, and the second external fracture of the single chip is connected with the photosensitive module 120. Optionally, the single chip microcomputer may be an 80C51 type single chip microcomputer.

The single chip is specifically configured to output a third level signal based on the first level signal output by the object sensing module 110 and the second level signal output by the photosensitive module 120, so as to control the on and off of the backlight 200. Specifically, the object sensing module 110 and the photosensitive module 120 respectively trigger the single chip microcomputer through the first external fracture and the second external fracture, and when the single chip microcomputer detects an object sensing signal (a first level signal) and a photosensitive signal (a second level signal), it is determined whether to control the backlight 200 to be turned on or off.

In the backlight control device provided in the embodiment of the application, by adding the object sensing module, the photosensitive module and the backlight control switch in the backlight control device in the manner described above, the backlight control switch can generate a corresponding level signal to control the on/off of the backlight according to the level signals output by the object sensing module and the photosensitive module, so that the time for lighting the backlight is reduced, and the power consumption caused by the backlight is reduced.

Alternatively, fig. 4 shows a schematic diagram of a backlight control apparatus according to still another embodiment of the present application, referring to fig. 4, the photosensitive module 120 may include a photosensitive module 121 and a voltage stabilizing module 123.

The light sensing module 121 is connected to the voltage stabilizing module 123.

The optical sensing module 121 is mainly configured to output a voltage signal representing ambient brightness to the voltage stabilizing module 123, and the voltage stabilizing module 123 is mainly configured to stabilize the voltage signal.

Optionally, the voltage stabilizing module 123 is mainly configured to output the second level signal to the control module 130 based on the voltage signal representing the ambient brightness.

Alternatively, fig. 5 shows a circuit diagram of a backlight control device according to still another embodiment of the present application, and referring to fig. 5, the photosensitive module 120 may include a delay circuit 122; the regulator module 123 may include an op-amp buffer 1232 and a smith trigger 1231.

In some embodiments, the delay circuit 122 is connected between the photo sensing module 121 and the voltage stabilizing module 123.

The delay circuit 122 is mainly configured to receive the voltage signal representing the ambient brightness output by the light sensing module 121, and delay a preset time to output the voltage signal representing the ambient brightness to the voltage stabilizing module 123. The preset time may be a preset time period or an accurate time point, and is not limited in detail herein. When the photosensitive module 120 detects the ambient brightness, a delay may be made before outputting the voltage signal representing the ambient brightness to the voltage stabilizing module 123. The purpose of the delay circuit is to ensure that the circuit is stable and will not be disturbed by transient brightness variations, such as lightning, flashing, etc., which will not cause signal output instability.

The operational amplifier buffer circuit 1232 is connected to the smith trigger circuit 1231.

The operational amplifier buffer circuit 1232 is mainly used to output a stable voltage signal to the smith trigger circuit 1231. Here, the operational amplifier buffer circuit 1232 performs an impedance conversion function, and obtains a stable voltage.

The smith trigger circuit 1231 is coupled between the delay circuit 122 and the control module 130.

The smith trigger circuit 1231 is mainly configured to output a second level signal to the control module 130 based on the voltage signal representing the ambient brightness output by the delay circuit 122 and the stable voltage signal output by the operational amplifier buffer circuit 1232.

Optionally, the smith trigger circuit 1231 is configured to implement a hysteresis function, specifically, to output a second level signal representing a first specified level to the control module 130 when the voltage signal representing the ambient brightness is greater than the first critical voltage signal; when the voltage signal representing the ambient brightness is smaller than a second critical voltage signal, outputting a second level signal representing a second specified level to the control module, wherein the second critical voltage signal is smaller than the first voltage critical signal, and the first specified level and the second specified level are different; when the voltage signal representing the ambient brightness is greater than the second threshold voltage signal and the voltage signal representing the ambient brightness is less than the first threshold voltage signal, the second level signal representing the level same as that of the previous time is output to the control module 130, where the previous time is a time when the smith trigger circuit last acquired that the voltage signal representing the ambient brightness changes.

For example, the first designated level may be a high level, and the second designated level may be a low level; or the first specified level may be a low level and the second specified level may be a high level. As shown in fig. 5, vadc in fig. 5 is a voltage signal representing ambient brightness, vcmp represents an input voltage signal of the smith trigger circuit, and Vcmp includes a first critical voltage signal VcmpH and a second critical voltage signal VcmpL, where VcmpH is greater than VcmpL, and the two critical voltage signals VcmpH and VcmpL are mainly used to implement a hysteresis function to prevent the circuit from repeatedly jumping, and the output second level signal will change only when the input voltage signal representing ambient brightness changes enough.

When Vadc > VcmpH, the smith trigger circuit 1231 outputs a second level signal Vo representing a low level to the control module; when Vadc < VcmpL, the smith trigger circuit 1231 outputs a second level signal Vo representing a high level to the control module; when VcmpL is less than Vadc and less than Vcmph, vo is consistent with the previous moment and does not change, and if Vo is the second level signal representing low level at the previous moment, the Vo is the second level signal representing low level; if Vo is the second level signal indicating high level at the previous time, vo is the second level signal indicating high level.

Optionally, as shown in fig. 5, the light sensing module 121 includes a light sensor D1 and a first resistor R1; the delay circuit 122 includes a second resistor R2 and a first capacitor C1; the smith trigger circuit 1231 comprises a first amplifier OP1, a third resistor R3 and a fourth resistor R4; the operational amplifier buffer circuit 1232 includes a second amplifier OP2, a second capacitor C2, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.

Among them, the photosensitive sensor is one of the most common sensors, and its kinds are various, and mainly include a phototube, a photomultiplier, a photoresistor, a phototriode, an infrared sensor, an ultraviolet sensor, an optical fiber type photoelectric sensor, a color sensor, and the like. Alternatively, the light sensor may be a GVBL-S12SD light sensor.

A photosensor is a sensor that converts an optical signal into an electrical signal using a photosensor, and its sensitive wavelength is in the vicinity of visible wavelengths, including infrared wavelengths and ultraviolet wavelengths. The optical sensor is not limited to detecting light, and can be used as a detecting element to form other sensors to detect a plurality of non-electrical quantities, as long as the non-electrical quantities are converted into changes of optical signals.

The photosensitive sensor is mainly applied to the field of automatic light control of electronic products such as solar lawn lamps, light-operated small night lamps, cameras, monitors, light-operated toys, acousto-optic control switches, cameras, anti-theft wallets, light-operated music boxes, birthday music candles, music cups, human body induction lamps, human body induction switches and the like.

Optionally, as shown in fig. 5, a first end of the photosensitive sensor D1 is connected to a first end of the first resistor R1, a second end of the photosensitive sensor D1 is grounded, and a second end of the first resistor R1 is connected to a power supply; a first end of the second resistor R2 is connected to a first end of the photosensor D1, and a second end of the second resistor R2 is connected to a first input end of the first amplifier OP 1; the first end of the first capacitor C1 is grounded, and the second end of the first capacitor C1 is connected with the second end of the second resistor R2; a second input end of the first amplifier OP1 is connected with a first end of the third resistor R3, an output end of the first amplifier OP1 is connected with a second input end of the control module 130, and a second end of the third resistor R3 is connected with a second end of the control module 130; a first end of the fourth resistor R4 is connected with a first end of the third resistor R3, and a second end of the fourth resistor R4 is connected with an output end of the second amplifier OP 2; a first input end of the second amplifier OP2 is connected with a first end of the fifth resistor R5, and a second input end of the second amplifier OP2 is connected with a second end of the fourth resistor R4; a first end of the second capacitor C2 is grounded, and a second end of the second capacitor C2 is connected with a first end of the fifth resistor R5; a first end of the fifth resistor R5 is connected with a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is grounded; a first end of the seventh resistor R7 is connected to a second end of the fifth resistor R5, and a second end of the seventh resistor R7 is grounded.

In fig. 5, the input voltage signal Vcmp = (Vo-Vcom) × R4/(R3 + R4) + Vcom of the first amplifier OP 1.

When Vadc varies, the corresponding Vo switches:

state 1: vadc > VcmpH, vo switches from VoH = Vcc to VoL, vcmpH = (Vcc-Vcom) × R4/(R3 + R4) + Vcom = Vcc × R4/(R3 + R4) + Vcom × R3/(R3 + R4);

state 2: vadc < VcmpL, vo switches from VoL =0 to VoH, vcmpL = R3/(R3 + R4) + Vcom;

state 3: vcmpL < Vadc < VcmpH, vo is consistent with the previous moment and does not change, and the circuit is prevented from jumping repeatedly.

For example, as shown in fig. 6, when the ambient brightness gradually becomes dark from L2 or more, vo is not changed when the ambient brightness is between L1 and L2, the backlight is still in the daytime mode (the lamp is not lit), and when the ambient brightness falls to L1, the Vo value is changed, and the backlight is switched to the night vision mode (the lamp is lit). When the ambient brightness gradually becomes bright from below L1 and the ambient brightness is between L1 and L2, vo is not changed, the night vision mode (lamp is on) is still kept, when the ambient brightness is increased to L2, the Vo value is changed, and the backlight is switched to the daytime mode (lamp is not on). Since the ambient brightness may fluctuate or deviate to a small extent around critical values in the day and night, the circuit can avoid fluctuations back and forth.

Optionally, the voltage signal representing the ambient brightness may be adjusted by the first resistor R1, so as to realize that the backlight is turned on at different ambient brightness. The value of the first resistor R1 may be set before installation. For example, the backlight is not lit currently, and when the ambient brightness is reduced to 5Lux, and the object sensing module senses a person, it is determined that the backlight needs to be lit; when the current backlight lamp is turned on and the ambient brightness is increased to 10Lux, the ambient brightness is judged to be high, and the backlight lamp needs to be turned off.

Optionally, fig. 7 shows a schematic view of an intelligent door lock provided in another embodiment of the present application, referring to fig. 7, the intelligent door lock 300 includes a backlight control device 100 and a backlight 200, the backlight 100 is connected to the backlight 200, wherein the backlight 200 may be an LED lamp.

Optionally, a silk-screen pattern is disposed on a position of the panel of the smart door lock 300 corresponding to the backlight 200, and the silk-screen pattern is used for determining the position of the backlight 200 when the backlight 200 is in an off state. Specifically, when the backlight is not bright during the daytime, the position of the backlight 200 may also be determined according to the silk-screen pattern.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.

Claims (11)

1. A backlight control apparatus, characterized in that the apparatus comprises:

the object sensing module is connected with the control module and used for outputting a first level signal to the control module when a moving object is sensed;

the photosensitive module is connected with the control module and is used for outputting a second level signal to the control module according to the ambient brightness;

the control module is used for being connected with a backlight lamp, and the control module is used for outputting a third level signal based on the first level signal and the second level signal so as to control the backlight lamp to be turned on or turned off.

2. The apparatus of claim 1, wherein the photosensitive module comprises a photosensitive module and a voltage stabilizing module;

the light sensing module is connected with the voltage stabilizing module, and is used for outputting a voltage signal representing the ambient brightness to the voltage stabilizing module, and the voltage stabilizing module is used for stabilizing the voltage signal;

the voltage stabilizing module is connected with the control module and used for outputting a second level signal to the control module based on the voltage signal representing the ambient brightness.

3. The apparatus of claim 2, wherein the photosensitive module further comprises a delay circuit;

the delay circuit is connected between the light sensing module and the voltage stabilizing module, and is configured to receive the voltage signal representing the ambient brightness output by the light sensing module and delay a preset time to output the voltage signal representing the ambient brightness to the voltage stabilizing module.

4. The apparatus of claim 3, wherein the voltage regulation module comprises an operational amplifier buffer circuit and a Smith trigger circuit;

the operational amplifier buffer circuit is connected with the Smith trigger circuit and is used for outputting a stable voltage signal to the Smith trigger circuit;

the Smith trigger circuit is connected between the delay circuit and the control module, and is used for outputting the second level signal to the control module based on the voltage signal representing the ambient brightness and the stable voltage signal.

5. The device of claim 4, wherein the Smith trigger circuit is configured to output a second level signal indicative of a first specified level to the control module when the voltage signal indicative of the ambient brightness is greater than a first threshold voltage signal;

the smith trigger circuit is configured to output a second level signal representing a second specified level to the control module when the voltage signal representing the ambient brightness is smaller than a second threshold voltage signal, the second threshold voltage signal is smaller than the first threshold voltage signal, and the first specified level and the second specified level are different;

the smith trigger circuit is configured to output a second level signal representing a level same as a previous level to the control module when the voltage signal representing the ambient brightness is greater than the second threshold voltage signal and is less than the first threshold voltage signal, where the previous level is a time when the smith trigger circuit last acquired that the voltage signal representing the ambient brightness changes.

6. The apparatus of claim 1, wherein the control module is configured to output a third level signal indicative of a fourth specified level to illuminate the backlight when the first level signal is a level signal indicative of a third specified level and the second level signal is a level signal indicative of a third specified level;

the control module is configured to control to output a third level signal representing a third designated level to turn off the backlight when at least one of the first level signal and the second level signal is a level signal representing a fourth designated level, where the third designated level is different from the fourth designated level.

7. The apparatus of claim 1, wherein the control module comprises a nand gate;

the first input end of the NAND gate is connected with the object sensing module and used for receiving a first level signal output by the object sensing module;

the second input end of the NAND gate is connected with the photosensitive module and used for receiving a second level signal output by the photosensitive module;

and the output end of the NAND gate is connected with the backlight lamp and used for outputting a third level signal based on the first level signal and the second level signal so as to control the turning on or off of the backlight lamp.

8. The apparatus of claim 1, wherein the control module comprises an and gate;

the first input end of the AND gate is connected with the object sensing module and used for receiving a first level signal output by the object sensing module;

the second input end of the AND gate is connected with the photosensitive module and used for receiving a second level signal output by the photosensitive module;

and the output end of the AND gate is connected with the backlight lamp and is used for outputting a third level signal based on the first level signal and the second level signal so as to control the on or off of the backlight lamp.

9. The apparatus of claim 1, further comprising:

the backlight control switch is connected between the control module and the backlight lamp, and is also connected with a power supply;

the backlight control switch is used for generating a signal for controlling the backlight to be turned on or off based on the third level signal and the voltage signal output by the power supply.

10. An intelligent door lock comprising a backlight and the backlight control device of any one of claims 1 to 9, the backlight being connected to the backlight control device.

11. The intelligent door lock according to claim 10, wherein a silk-screen pattern is disposed on a panel of the intelligent door lock corresponding to the backlight, and the silk-screen pattern is used for determining the position of the backlight when the backlight is in an off state.

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