A light sensor lamp circuit

Abstract

The present application relates to a light sensor lamp circuit, which is applied in the field of lighting technology, and includes a power supply unit, which is used to supply power to the circuit; a light sensing unit, which is used to output a light control signal according to the brightness of the external environment light; a switching unit, which is connected to the output end of the power supply unit, and is used to output a light sensor lamp control signal according to the user's selection, and switch the control mode of the light sensor lamp; the light sensor lamp control signal includes a first control signal and a second control signal; when the light sensor lamp control signal is the first control signal, the light sensor lamp is connected to the light sensor unit so that the light sensor lamp automatically switches between the on and off states as the brightness changes; when the light sensor lamp control signal is the second control signal, the light sensor lamp is connected to the power supply unit so that the light sensor lamp remains in a constant on state. The technical effect of the present application is: adaptively adjusting the on and off of the light sensor lamp of an electric bicycle.

Description

Technical Field

[0001] The present application relates to the technical field of lighting lamps, and in particular to a light sensing lamp circuit. Background Art

[0002] When riding an electric bicycle at night, the owner needs to turn on the headlights to improve driving safety; however, the headlights of electric bicycles currently on the market turn on automatically under a fixed brightness of external light, and the owner cannot adjust the headlights by himself according to the brightness of the external light to which he adapts. Some owners think that the headlights are turned on in advance when it is very bright, while some owners think that the headlights are not turned on when it is very dark. In addition, when the light sensing device is illuminated by strong light from street lamps and vehicles, it may misjudge the operation and cause the headlights to turn off, thereby making the owner's riding experience poor. Summary of the invention

[0003] In order to help solve the problem that the car owner cannot adjust the headlights according to the brightness of the external light that he adapts to, the present application provides a light sensing lamp circuit, which adopts the following technical solutions: including:

[0004] A power supply unit, the power supply unit is used to supply power to the circuit;

[0005] A light sensing unit, the light sensing unit is used to output a light control signal according to the brightness of the external environment light;

[0006] A switching unit, the switching unit is connected to the output end of the power supply unit, and is used to output a light sensing lamp control signal according to a user's selection to switch the control mode of the light sensing lamp;

[0007] The light sensing lamp control signal includes a first control signal and a second control signal;

[0008] When the light sensing lamp control signal is the first control signal, the light sensing lamp is connected to the light sensing unit so that the light sensing lamp automatically switches between on and off states as the brightness changes;

[0009] When the light-sensing lamp control signal is the second control signal, the light-sensing lamp is connected to the power supply unit to keep the light-sensing lamp in a normally-on state.

[0010] Through the above technical scheme, the switching unit is used to control the on and off mode of the photosensitive lamp. When it is the first control signal, the photosensitive lamp is in a braking state. Controlled by the photosensitive unit, the lamp can automatically adjust the on and off states according to the external brightness. When it is the second control signal, the photosensitive lamp is always on. Through the setting of the switching unit, the user can realize the control mode of the switching lamp, thereby realizing adaptive adjustment of the photosensitive headlights on the electric bicycle, so that the electric bicycle can automatically turn on the headlights when driving at night, thereby improving driving safety.

[0011] In a specific implementation scheme, the power supply unit includes:

[0012] A power connection module, the power connection module is used to receive an external power input to power the circuit, and output power to control the light sensor lamp;

[0013] A voltage drop circuit module, the voltage drop circuit module is connected to the output end of the power connection module, and is used to reduce the circuit voltage and output the reduced voltage;

[0014] A voltage stabilizing circuit module is connected to the output end of the voltage drop circuit module, and is used to stabilize the circuit voltage and output the stabilized voltage.

[0015] Through the above technical solution, the external power input circuit supplies power to the entire circuit through the power connector. Port 1 of the power connector can be understood as VCC, which supplies power to the entire circuit. After circuit processing, the output power is output through port 2 of the power connector to power the light-sensing lamp. The voltage drop circuit module and the voltage stabilizing circuit module can stabilize the power supply within a suitable range to supply power to the circuit, so as to ensure that the light-sensing unit and the circuit switching unit of the circuit can work normally.

[0016] In a specific implementation scheme, the power connection module is a power connector, and the power connector includes port 1, port 2 and port 3;

[0017] Port 1 of the power connector is used to receive a DC power source input from an external power source;

[0018] Port 2 of the power connector is used to output power;

[0019] Port 3 of the power connector is grounded.

[0020] In a specific implementation scheme, the power connection module further includes:

[0021] A resistor R1, one end of the resistor R1 is connected to the port 1 of the power connector, and the other end of the resistor R1 outputs power;

[0022] A capacitor C2, one end of the capacitor C2 is connected to a connection point between the resistor R1 and the port 1 of the power connector, and the other end of the capacitor C2 is grounded.

[0023] Through the above technical solution, the resistor R1 is used for current limiting and can play a role in protecting the circuit, and the capacitor C2 is used for power supply filtering.

[0024] In a specific implementation scheme, the voltage drop circuit module includes:

[0025] A resistor R3 and a capacitor C7 connected in series, the other end of the resistor R3 is connected to the power supply end of the power connection module, and the other end of the capacitor C7 is grounded;

[0026] NPN transistor Q1, whose base is connected to the connection point of the resistor R3 and the capacitor C7, whose collector is connected to the power supply end of the power connection module, and whose emitter outputs the stepped-down voltage;

[0027] A voltage stabilizing diode D1, wherein a cathode of the voltage stabilizing diode D1 is connected to a base of the NPN transistor Q1, and an anode of the voltage stabilizing diode D1 is grounded.

[0028] In a specific implementation scheme, the voltage drop circuit module further includes:

[0029] A resistor R2, one end of which is connected to the emitter of the NPN transistor Q1, and the other end of which outputs a stepped-down voltage;

[0030] Capacitor C1, one end of the capacitor C1 is connected to the emitter of the NPN transistor Q1, and the other end of the capacitor C1 is grounded.

[0031] In a specific implementation scheme, the voltage stabilizing circuit module includes:

[0032] A resistor R4 and a resistor R5 connected in series, the other end of the resistor R5 is grounded, the other end of the resistor R4 is connected to the output end of the voltage drop circuit module, and outputs a stabilized voltage;

[0033] The voltage stabilizing chip U1 has a pin 1 connected to the connection point between the resistor R4 and the resistor R5, a pin 2 connected to the output end of the voltage drop circuit module, and a pin 3 connected to the ground.

[0034] In a specific implementation scheme, the switching unit includes:

[0035] NPN transistor Q3, whose base is grounded through resistor R8, emitter is grounded, and collector is connected to the output end of the power supply unit through resistor R22 and resistor R9 connected in series;

[0036] a voltage zener diode D2, a cathode of which is connected to a connection point between the resistor R9 and the output end of the power supply unit, and an anode of which is connected to a connection point between the resistor R22 and the resistor R9;

[0037] The single-pole double-throw switch SW1 has an input terminal and two output terminals, the input terminal is grounded, one of the output terminals is grounded, and the other output terminal is connected to the gate of the PMOS tube Q2 through a resistor R23;

[0038] A PMOS tube Q2, whose source is connected to the port 1 of the power connector, and whose drain is connected to the port 2 of the power connector;

[0039] A parasitic diode, wherein a cathode of the parasitic diode is connected to a source of the PMOS tube Q2, and an anode of the parasitic diode is connected to a drain of the PMOS tube Q2.

[0040] Through the above technical solution, the switching unit is used to switch the control mode of the photosensitive lamp. When it is the first control signal, the photosensitive lamp is in a controlled state, and the photosensitive lamp can adaptively adjust the brightness according to the photosensitive control signal output by the photosensitive unit. When it is the second control signal, the photosensitive lamp remains in a constant light state and is not controlled by the photosensitive unit, so that the user can manually switch the control mode of the photosensitive lamp and realize adaptive adjustment of the photosensitive lamp.

[0041] In a specific embodiment, the light sensing unit comprises:

[0042] A photoresistor R6 and a resistor R21 connected in series, the other end of the photoresistor R6 is connected to the output end of the power supply unit and is grounded through a capacitor C3 and a capacitor C4 connected in parallel, and the other end of the resistor R21 is grounded through a capacitor C5 and a resistor R7 connected in parallel;

[0043] A PNP transistor Q5, whose base is connected to the connection point between the resistor R21 and the resistor R7, whose emitter is connected to the connection point between the photoresistor R6 and the capacitor C3, and whose collector is connected to the charging capacitor C6 through the resistor R10;

[0044] a charging capacitor C6, wherein an anode of the charging capacitor C6 is connected to the other end of the resistor R10, and a cathode of the charging capacitor C6 is grounded;

[0045] The photoresistor R6 is used to detect the brightness of the external environment, and the connection point between the resistor R10 and the charging capacitor C6 is used to output a brightness control signal.

[0046] Through the above technical solution, the light-sensing unit is used to receive external light, and uses the photoresistor R6 to detect the brightness of the external environment to output a light control signal. The brighter the external light, the smaller the resistance of the photoresistor, which will cause the PNP transistor Q5 to be cut off, and then the light-sensing lamp will be extinguished. The lower the external light, the larger the resistance of the photoresistor, which will cause the PNP transistor Q5 to be turned on, and then the light-sensing lamp will be turned on.

[0047] In a specific implementation scheme, the voltage regulator chip U1 is of model TL431.

[0048] In summary, this application has the following beneficial technical effects:

[0049] The switching unit is used to control the on and off mode of the photosensitive lamp. When it is the first control signal, the photosensitive lamp is in a braking state. Controlled by the photosensitive unit, the lamp can automatically adjust the on and off states according to the external brightness. When it is the second control signal, the photosensitive lamp is always on. Through the setting of the switching unit, the user can switch the control mode of the lamp, thereby realizing adaptive adjustment of the photosensitive headlights on the electric bicycle, so that the electric bicycle can automatically turn on the headlights when driving at night, thereby improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a circuit diagram of a light sensor lamp according to an embodiment of the present application.

[0051] Figure numerals: 100, power supply unit; 101, power connection module; 102, voltage drop circuit module; 103, voltage stabilizing circuit module; 200, light sensing unit; 300, switching unit. DETAILED DESCRIPTION

[0052] The following is combined with Figure 1 This application is described in further detail.

[0053] The embodiment of the present application discloses a light-sensing lamp circuit, which can control the on and off of the light-sensing headlight on an electric bicycle. Through the control of the light-sensing lamp circuit, the brightness of the headlight can be adjusted automatically according to the brightness of the external adaptive light, thereby improving the safety of electric bicycle driving and the riding experience of electric bicycle owners.

[0054] Reference Figure 1 , a light sensing lamp circuit comprises:

[0055] A power supply unit 100, the power supply unit 100 is used to supply power to the circuit; a light sensing unit 200, the light sensing unit 200 is used to output a light control signal according to the brightness of the external environment light; a switching unit 300, the switching unit 300 is connected to the output end of the power supply unit, and is used to output a light sensing light control signal according to user selection, and switch the control mode of the light sensing light; the light sensing light control signal includes a first control signal and a second control signal; when the light sensing light control signal is the first control signal, the light sensing light is connected to the light sensing unit so that the light sensing light automatically switches between the on and off states as the brightness changes; when the light sensing light control signal is the second control signal, the light sensing light is connected to the power supply unit so that the light sensing light remains in a normally on state.

[0056] The power supply unit 100 includes: a power connection module 101, which is used to receive an external power input to power the circuit and output power to control the light sensor lamp; a voltage drop circuit module 102, which is connected to the output end of the power connection module, and is used to reduce the circuit voltage and output the reduced voltage; a voltage stabilizing circuit module 103, which is connected to the output end of the voltage drop circuit module 102, and is used to stabilize the circuit voltage and output the stabilized voltage.

[0057] In the embodiment of the present application, the power connection module 101 is a power connector, and the power connector includes port 1, port 2 and port 3; port 1 of the power connector is used to receive a DC power supply input by an external power supply; port 2 of the power connector is used to output power; and port 3 of the power connector is grounded. The power connection module 101 also includes: a resistor R1, one end of the resistor R1 is connected to port 1 of the power connector, and the other end of the resistor R1 outputs power; a capacitor C2, one end of the capacitor C2 is connected to the connection point between the resistor R1 and port 1 of the power connector, and the other end of the capacitor C2 is grounded. Among them, the resistor R1 is used for current limiting, which can play a role in protecting the circuit, and the capacitor C2 is used for power filtering.

[0058] The voltage drop circuit module 102 includes: a resistor R3 and a capacitor C7 connected in series, the other end of the resistor R3 is connected to the power supply end of the power connection module 101, and the other end of the capacitor C7 is grounded; the base of the NPN transistor Q1 is connected to the connection point of the resistor R3 and the capacitor C7, its collector is connected to the power supply end of the power connection module 101, and the emitter outputs the stepped-down voltage; the cathode of the voltage zener diode D1 is connected to the base of the NPN transistor Q1, and the anode of the voltage zener diode D1 is grounded. The voltage drop circuit module 102 also includes: one end of the resistor R2 is connected to the emitter of the NPN transistor Q1, and the other end of the resistor R2 outputs the stepped-down voltage; one end of the capacitor C1 is connected to the emitter of the NPN transistor Q1, and the other end of the capacitor C1 is grounded.

[0059] The voltage stabilizing circuit module 103 includes: a resistor R4 and a resistor R5 connected in series, the other end of the resistor R5 is grounded, the other end of the resistor R4 is connected to the output end of the voltage drop circuit module, and outputs a stabilized voltage; a voltage stabilizing chip U1, whose pin 1 is connected to the connection point between the resistor R4 and the resistor R5, pin 2 is connected to the output end of the voltage drop circuit module 102, and pin 3 is grounded; wherein, the model of the voltage stabilizing chip U1 is TL431.

[0060] The switching unit 300 includes: an NPN transistor Q3, whose base is grounded through a resistor R8, whose emitter is grounded, and whose collector is connected to the output end of the power supply unit 100 through a resistor R22 and a resistor R9 connected in series; a voltage stabilizing diode D2, whose cathode is connected to the connection point between the resistor R9 and the output end of the power supply unit 100, and whose anode is connected to the connection point between the resistor R22 and the resistor R9; a single-pole double-throw switch SW1, having an input end and two output ends, the input end is grounded, one of the output ends is grounded, and the other output end is connected to the gate of the PMOS tube Q2 through a resistor R23; a PMOS tube Q2, whose source is connected to the port 1 of the power connector, and whose drain is connected to the port 2 of the power connector; a parasitic diode, whose cathode is connected to the source of the PMOS tube Q2, and whose anode is connected to the drain of the PMOS tube Q2.

[0061] The switching unit is used to switch the control mode of the light-sensitive lamp. When the first control signal is used, the light-sensitive lamp is in a controlled state, and the light-sensitive lamp can perform adaptive adjustment of the brightness according to the light-sensitive control signal output by the light-sensitive unit. When the second control signal is used, the light-sensitive lamp remains in a constant light state and is not controlled by the light-sensitive unit, so that the user can manually switch the control mode of the light-sensitive lamp to achieve adaptive adjustment of the light-sensitive lamp. It should be noted that the single-pole double-throw switch in the switching unit can be connected to the adjustment knob provided on the electric bicycle, so that the user can switch the control mode of the light-sensitive lamp by turning the adjustment knob, and then the light-sensitive lamp can be adaptively adjusted to the on and off state under the braking state.

[0062] The light sensing unit 200 includes: a photoresistor R6 and a resistor R21 connected in series, the other end of the photoresistor R6 is connected to the output end of the power supply unit 100, and is grounded through capacitors C3 and C4 connected in parallel, and the other end of the resistor R21 is grounded through capacitors C5 and R7 connected in parallel; a PNP transistor Q5, a base of which is connected to a connection point between the resistor R21 and the resistor R7, an emitter of which is connected to a connection point between the photoresistor R6 and the capacitor C3, and a collector of which is connected to a charging capacitor C6 through a resistor R10; a charging capacitor C6, an anode of which is connected to the other end of the resistor R10, and a cathode of which is grounded; the photoresistor R6 is used to detect the brightness of the external ambient light, and the connection point between the resistor R10 and the charging capacitor C6 is used to output a light control signal.

[0063] The implementation principle of the embodiment of the present application is: the light-sensing light of the electric bicycle is connected between port 2 and port 3 of the power connector through an external connection, and the external power is input through port 1 of the power connector to power the entire circuit; the switching unit 300 can switch the control mode of the light-sensing light, and the single-pole double-throw switch SW1 in the switching unit 300 is used to switch the control mode of the light-sensing light.

[0064] When the input port 2 of the single-pole double-throw switch SW1 is connected to the output port 3, the PMOS tube Q2 is always in the on state, the power connector port 1 and port 2 are short-circuited, and the light sensor lamp is directly connected to the power supply and remains always on.

[0065] When the input port 2 of the single-pole double-throw switch SW1 is connected to the output port 1, the PMOS tube Q2 is controlled by the light sensing unit 200, and the photoresistor R6 in the light sensing unit 200 detects the brightness of the external environment. The stronger the light, the smaller the resistance of the photoresistor R6, and the darker the light, the larger the resistance of the photoresistor R6; when the brightness of the external environment is strong, the resistance of the photoresistor R6 becomes smaller, and the potential of the resistor R7 increases, so that the PNP transistor Q5 is cut off, and the PNP transistor Q5 is cut off so that the NPN transistor Q3 is cut off, thereby cutting off the PMOS tube Q2, and the power cannot be output from the power connector port 2, and the light sensing lamp is off; when the brightness of the external light is dark, the resistance of the photoresistor R6 becomes larger, and the point of the resistor R7 is reduced, so that the PNP transistor Q5 is turned on, and the PNP transistor Q5 is turned on so that the NPN transistor Q3 is turned on, thereby turning on the PMOS tube Q2, and the power after voltage drop and voltage stabilization can be output through the power connector port 2 to control the light sensing lamp.

[0066] The charging capacitor C6 in the photosensitive unit 200 is mainly used for energy storage. When the PNP transistor Q5 is turned on, the charging capacitor C6 can store energy. When the external ambient light suddenly becomes brighter, Q5 is turned off, and the charging capacitor can supply power to the NPN transistor Q3, so that the NPN transistor Q3 will not be turned off immediately, thereby delaying the shutdown of the photosensitive lamp.

[0067] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A light sensor lamp circuit, characterized in that: include: A power supply unit, the power supply unit is used to supply power to the circuit; A light sensing unit, the light sensing unit is used to output a light control signal according to the brightness of the external environment light; A switching unit, the switching unit is connected to the output end of the power supply unit, and is used to output a light sensing lamp control signal according to a user's selection to switch the control mode of the light sensing lamp; The light sensing lamp control signal includes a first control signal and a second control signal; When the light sensing lamp control signal is the first control signal, the light sensing lamp is connected to the light sensing unit so that the light sensing lamp automatically switches between on and off states as the brightness changes; When the light-sensing lamp control signal is the second control signal, the light-sensing lamp is connected to the power supply unit to keep the light-sensing lamp in a normally-on state.

2. The light sensor lamp circuit according to claim 1, characterized in that: The power supply unit comprises: A power connection module, the power connection module is used to receive an external power input to power the circuit, and output power to control the light sensor lamp; A voltage drop circuit module, the voltage drop circuit module is connected to the output end of the power connection module, and is used to reduce the circuit voltage and output the reduced voltage; A voltage stabilizing circuit module is connected to the output end of the voltage drop circuit module, and is used to stabilize the circuit voltage and output the stabilized voltage.

3. The light sensor lamp circuit according to claim 2, characterized in that: The power connection module is a power connector, and the power connector includes port 1, port 2 and port 3; Port 1 of the power connector is used to receive a DC power source input from an external power source; Port 2 of the power connector is used to output power; Port 3 of the power connector is grounded.

4. The light sensor lamp circuit according to claim 3, characterized in that: The power connection module also includes: A resistor R1, one end of the resistor R1 is connected to the port 1 of the power connector, and the other end of the resistor R1 outputs power; A capacitor C2, one end of the capacitor C2 is connected to a connection point between the resistor R1 and the port 1 of the power connector, and the other end of the capacitor C2 is grounded.

5. The light sensing lamp circuit according to claim 2, characterized in that: The voltage drop circuit module comprises: A resistor R3 and a capacitor C7 connected in series, the other end of the resistor R3 is connected to the power supply end of the power connection module, and the other end of the capacitor C7 is grounded; NPN transistor Q1, whose base is connected to the connection point of the resistor R3 and the capacitor C7, whose collector is connected to the power supply end of the power connection module, and whose emitter outputs the stepped-down voltage; A voltage stabilizing diode D1, wherein a cathode of the voltage stabilizing diode D1 is connected to a base of the NPN transistor Q1, and an anode of the voltage stabilizing diode D1 is grounded.

6. The light sensor lamp circuit according to claim 5, characterized in that: The voltage drop circuit module further includes: A resistor R2, one end of which is connected to the emitter of the NPN transistor Q1, and the other end of which outputs a stepped-down voltage; Capacitor C1, one end of the capacitor C1 is connected to the emitter of the NPN transistor Q1, and the other end of the capacitor C1 is grounded.

7. The light sensor lamp circuit according to claim 2, characterized in that: The voltage stabilizing circuit module comprises: A resistor R4 and a resistor R5 connected in series, the other end of the resistor R5 is grounded, the other end of the resistor R4 is connected to the output end of the voltage drop circuit module, and outputs a stabilized voltage; The voltage stabilizing chip U1 has a pin 1 connected to the connection point between the resistor R4 and the resistor R5, a pin 2 connected to the output end of the voltage drop circuit module, and a pin 3 connected to the ground.

8. The light sensor lamp circuit according to claim 3, characterized in that: The switching unit comprises: NPN transistor Q3, whose base is grounded through resistor R8, emitter is grounded, and collector is connected to the output end of the power supply unit through resistor R22 and resistor R9 connected in series; a voltage zener diode D2, a cathode of which is connected to a connection point between the resistor R9 and the output end of the power supply unit, and an anode of which is connected to a connection point between the resistor R22 and the resistor R9; The single-pole double-throw switch SW1 has an input terminal and two output terminals, the input terminal is grounded, one of the output terminals is grounded, and the other output terminal is connected to the gate of the PMOS tube Q2 through a resistor R23; A PMOS tube Q2, whose source is connected to the port 1 of the power connector, and whose drain is connected to the port 2 of the power connector; A parasitic diode, wherein a cathode of the parasitic diode is connected to a source of the PMOS tube Q2, and an anode of the parasitic diode is connected to a drain of the PMOS tube Q2.

9. The light sensor lamp circuit according to claim 1, characterized in that: The light sensing unit comprises: A photoresistor R6 and a resistor R21 connected in series, the other end of the photoresistor R6 is connected to the output end of the power supply unit and is grounded through a capacitor C3 and a capacitor C4 connected in parallel, and the other end of the resistor R21 is grounded through a capacitor C5 and a resistor R7 connected in parallel; A PNP transistor Q5, whose base is connected to the connection point between the resistor R21 and the resistor R7, whose emitter is connected to the connection point between the photoresistor R6 and the capacitor C3, and whose collector is connected to the charging capacitor C6 through the resistor R10; a charging capacitor C6, wherein an anode of the charging capacitor C6 is connected to the other end of the resistor R10, and a cathode of the charging capacitor C6 is grounded; The photoresistor R6 is used to detect the brightness of the external environment, and the connection point between the resistor R10 and the charging capacitor C6 is used to output a brightness control signal.

10. The light sensor lamp circuit according to claim 7, characterized in that: The model of the voltage regulator chip U1 is TL431.

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