Driving circuit, light-emitting circuit and scooter

Abstract

The utility model provides a driving circuit, a light-emitting circuit and a scooter, and belongs to the technical field of electronic circuits. The driving circuit comprises a control tube, the first end of the control tube is electrically connected to a controlled device, the second end of the control tube is electrically connected to a grounding end, and the control end of the control tube inputs a control signal to enable the control tube to be in an amplification area; and the current limiting device is connected in series between the control end and the control port of the control tube so as to adjust the input current of the control end. According to the driving circuit, the light-emitting circuit and the scooter provided by the utility model, the current of the controlled device is stable and adjustable.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and particularly relates to a driving circuit, a light-emitting circuit and a scooter. Background Art

[0002] To ensure the constancy of the current of a Light Emitting Diode (LED), a constant-current chip can be used to form a driving circuit for the LED. The output current of the chip is set to a constant current through the peripheral circuit of the constant-current chip, and the LED is connected in series at the output end of the constant-current chip.

[0003] However, when using a constant-current chip to drive an LED, since the constant-current chip operates in a constant-current mode, although the current flowing through the LED is constant, it cannot be adjusted. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a driving circuit, a light-emitting circuit and a scooter, which can solve the problem that although the current flowing through the LED is constant, it cannot be adjusted.

[0005] To achieve the above purpose, the utility model provides a driving circuit, which at least includes:

[0006] A control tube, the first end of the control tube is electrically connected to the controlled device, the second end of the control tube is electrically connected to the ground terminal, and a control signal is input to the control end of the control tube to make the control tube in the amplification region; and

[0007] A current-limiting device, the current-limiting device is connected in series between the control end and the control port of the control tube to adjust the input current of the control end.

[0008] In an embodiment of the utility model, the control tube includes a first triode, the collector of the first triode is electrically connected to the controlled device, the emitter of the first triode is electrically connected to the ground terminal, and the voltage of the collector of the first triode is greater than the voltage of the base, and the voltage between the collector and the base of the first triode is greater than the voltage of the emitter.

[0009] In an embodiment of the utility model, the first triode is an NPN-type triode.

[0010] In an embodiment of the utility model, the current-limiting device includes a first current-limiting resistor, and the first current-limiting resistor is connected in series between the control end and the control port of the control tube.

[0011] In an embodiment of the utility model, the driving circuit further includes a voltage-dividing device, and the voltage-dividing device is connected in series between the control end of the control tube and the ground terminal.

[0012] In an embodiment of the present utility model, the voltage divider device includes a voltage dividing resistor, and the voltage dividing resistor is connected in series between the control end of the control tube and the ground end.

[0013] In an embodiment of the present utility model, the drive circuit further includes a current limiting circuit, and the current limiting circuit is connected in series between the second end of the control tube and the ground end.

[0014] In an embodiment of the present utility model, the drive circuit further includes a current limiting circuit, and the current limiting circuit includes:

[0015] A voltage limiting device, the voltage limiting device is connected in series between the second end of the control tube and the ground end; and

[0016] A second current resistor, the second current resistor is connected in series between the second end of the control tube and the ground end.

[0017] In an embodiment of the present utility model, the voltage limiting device includes a second triode, the base of the second triode is electrically connected to the second end of the control tube, the collector of the second triode is electrically connected to the control end of the control tube, and the emitter of the second triode is electrically connected to the ground end.

[0018] In an embodiment of the present utility model, the second triode is an NPN type triode.

[0019] In an embodiment of the present utility model, the drive circuit further includes a protection device, and the protection device is connected in series between the first end of the control tube and the controlled device.

[0020] In an embodiment of the present utility model, the protection device includes at least two protection resistors connected in parallel, and the protection resistors are connected in series between the first end of the control tube and the controlled device.

[0021] In an embodiment of the present utility model, the drive circuit further includes a filtering device, and the filtering device is connected in series between the control end of the control tube and the ground end.

[0022] In an embodiment of the present utility model, the filtering device includes a filtering capacitor, and the filtering capacitor is connected in series between the control end of the control tube and the ground end.

[0023] The present utility model also provides a lighting circuit, and the lighting circuit includes:

[0024] A light emitting diode; and

[0025] The drive circuit according to any one of the above.

[0026] The present utility model further provides a scooter, and the scooter includes the lighting circuit described in any one of the above.

[0027] In summary, for a driving circuit, a lighting circuit and a scooter provided by the present utility model, by connecting the first end and the second end of the control tube in series between the device to be controlled and the ground terminal, the current of the device to be controlled is made equal to the output current from the first end to the second end of the control tube. At the same time, the control tube is arranged in the amplification region, so that the output current from the first end to the second end can be adjusted by adjusting the input current of the control terminal of the control tube. Furthermore, a current limiting device is electrically connected to the control terminal of the control tube. When the input interface of the driving circuit has an input voltage, by adjusting the resistance value of the current limiting device, the input current of the control terminal of the control tube can be adjusted, achieving the purpose of flexibly controlling the current of the device to be controlled. By connecting the current limiting circuit in series between the second end of the control tube and the ground terminal, the current of the device to be controlled is limited below the ratio of the set voltage to the resistance value of the second current limiting resistor, avoiding the impact of large current on the device to be controlled and stabilizing the current value of the device to be controlled. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0029] Figure 1 It is a structural block diagram of a driving circuit in an embodiment of the present application.

[0030] Figure 2 It is a circuit diagram of a driving circuit in an embodiment of the present application.

[0031] Figure 3 It is a structural block diagram of a driving circuit in another embodiment of the present application.

[0032] Figure 4 It is a circuit diagram of a driving circuit in another embodiment of the present application.

[0033] Figure 5 It is a structural block diagram of a lighting circuit in an embodiment of the present application.

[0034] Figure 6 It is a circuit diagram of a lighting circuit in an embodiment of the present application.

[0035] Figure 7 It is a structural diagram of a scooter.

[0036] Reference Numeral Description:

[0037] 101. Control tube; 102. Current limiting device; 103. Voltage dividing device; 104. Filtering device; 105. Current limiting circuit; 106. Protection device 106. Detailed implementation mode

[0038] To facilitate the understanding of this application, the following will provide a more comprehensive description of this application with reference to relevant attached drawings. The attached drawings show the preferred implementation modes of this application. However, this application can be implemented in many different forms and is not limited to the implementation modes described herein. On the contrary, the purpose of providing these implementation modes is to make the disclosure of this application more thoroughly understood.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific implementation modes and are not intended to limit this application.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] Please refer to Figure 1 and Figure 3 As shown, this application provides a drive circuit. The input interface Pin of the drive circuit inputs the voltage signal output by the controller, and the output interface Pout of the drive circuit is electrically connected to the controlled device. The current of the output interface Pout of the drive circuit is controlled by the voltage signal input through the input interface Pin, and further the current flowing through the controlled device is controlled. Among them, the controlled device can be any electrical device with adjustable current.

[0042] Please refer to Figure 1 As shown, in an embodiment of this application, the drive circuit includes a control tube 101 and a current limiting device 102. Among them, the first end of the control tube 101 is the output interface Pout, the output interface Pout is electrically connected to the controlled device, the second end of the control tube 101 is electrically connected to the ground terminal GND, and the control terminal of the control tube 101 inputs a control signal to make the control tube 101 in the amplification region. At this time, the output current at the output end of the control tube 101 is controlled by the control signal at the control end. When the control signal at the input end changes, the output current from the first end to the second end of the control tube 101 also changes.

[0043] Please refer to Figure 1 As shown, it should be noted that the control signals at the control end of the control tube 101 include input current and input voltage. Specifically, whether to adjust the input current or the input voltage can be determined according to the type of the control tube 101.

[0044] Please refer to Figure 1 and Figure 2 As shown, in a specific embodiment of the present application, the control tube 101 includes a first triode Q101, and the first triode Q101 is an NPN-type triode. The control signal at the control end of the control tube 101 is the input current. At this time, the collector of the first triode Q101 is the output interface Pout, the output interface Pout is electrically connected to the controlled device, the collector of the first triode Q101 is electrically connected to the ground terminal GND, and the base of the first triode Q101 inputs the control signal. And to ensure that the first triode Q101 operates in the amplification region, the voltages at the three terminals of the first triode Q101 are set as follows: the voltage at the collector of the first triode Q101 is greater than the voltage at the base, and the voltage at the base of the first triode Q101 is greater than the voltage at the emitter. When the first triode Q101 operates in the amplification region, the output current from the collector to the emitter of the first triode Q101 is controlled by the input current at the base. Therefore, by adjusting the input current at the base of the first triode Q101, the current flowing through the controlled device can be adjusted.

[0045] Please refer to Figure 1 As shown, in other embodiments, the control tube 101 can also be other control tubes 101 having an amplification region, such as a field effect tube, etc.

[0046] Please refer to Figure 1 As shown, in an embodiment of the present application, the current limiting device 102 is electrically connected to the control end of the control tube 101, that is, the current limiting device 102 is connected in series between the control end of the control tube 101 and the input interface Pin of the drive circuit. When the input interface Pin of the drive circuit inputs a voltage, by adjusting the resistance value of the current limiting device 102, the input current at the control end of the control tube 101 can be adjusted. And when the control tube 101 is in the amplification region, when adjusting the input current at the control end of the control tube 101, the magnitude of the output current from the first end to the second end of the control tube 101 can be adjusted, thereby achieving the purpose of adjusting the current flowing through the controlled device.

[0047] Please refer to Figure 1 and Figure 2As shown, in a specific embodiment of the present application, the current limiting device 102 includes a first current limiting resistor R101. By adjusting the resistance value of the first current limiting resistor R101, the magnitude of the input current at the control terminal of the first triode Q101 can be adjusted. Among them, the input voltage of the input interface Pin of the drive circuit and the resistance value of the current limiting device 102 can be set according to the current requirement of the controlled device. In an embodiment of the present application, for example, the input voltage of the input interface Pin of the drive circuit is 1V to 5V, then the resistance value range of the current limiting device 102 is, for example, 100Ω to 1KΩ, and specifically it can be 510Ω.

[0048] Please refer to Figure 1 and Figure 2 As shown, in an embodiment of the present application, by connecting the first end and the second end of the control tube 101 in series between the controlled device and the ground terminal GND, the current of the controlled device is made equal to the output current from the first end to the second end of the control tube 101. At the same time, the control tube 101 is set in the amplification region, so that the output current from the first end to the second end can be adjusted by adjusting the input current at the control terminal of the control tube 101. Furthermore, a current limiting device 102 is electrically connected to the control terminal of the control tube 101. When the input interface Pin of the drive circuit has an input voltage, by adjusting the resistance value of the current limiting device 102, the input current at the control terminal of the control tube 101 can be adjusted.

[0049] Please refer to Figure 3 As shown, in another embodiment of the present application, the drive circuit includes a control tube 101, a current limiting device 102, a voltage dividing device 103, a filtering device 104, a current limiting circuit 105, and a protection device 106.

[0050] Please refer to Figure 3 As shown, in another embodiment of the present application, the first end of the control tube 101 is an output interface Pout, the output interface Pout is electrically connected to the controlled device, the second end of the control tube 101 is electrically connected to the ground terminal GND, and a control signal is input to the control terminal of the control tube 101 to make the control tube 101 in the amplification region. At this time, the output current at the output end of the control tube 101 is controlled by the control signal at the control terminal. When the control signal at the input end changes, the output current from the first end to the second end of the control tube 101 also changes.

[0051] Please refer to Figure 3 As shown, it should be noted that the control signal at the control terminal of the control tube 101 includes an input current and an input voltage. Specifically, whether to adjust the input current or the input voltage can be determined according to the type of the control tube 101.

[0052] Please refer to Figure 3 and Figure 4As shown, in another specific embodiment of the present application, the control tube 101 includes a first triode Q101, and the first triode Q101 is an NPN-type triode. The control signal at the control end of the control tube 101 is an input current. At this time, the collector of the first triode Q101 is the output interface Pout, the output interface Pout is electrically connected to the controlled device, the collector of the first triode Q101 is electrically connected to the ground terminal GND, and the base of the first triode Q101 inputs the control signal. And to ensure that the first triode Q101 operates in the amplification region, the voltages at the three terminals of the first triode Q101 are set as follows: the voltage at the collector of the first triode Q101 is greater than the voltage at the base, and the voltage at the base of the first triode Q101 is greater than the voltage at the emitter. When the first triode Q101 operates in the amplification region, the output current from the collector to the emitter of the first triode Q101 is controlled by the input current at the base. Therefore, by adjusting the input current at the base of the first triode Q101, the current flowing through the controlled device can be adjusted.

[0053] Please refer to Figure 3 As shown, in other embodiments, the control tube 101 can also be other control tubes 101 having an amplification region, such as a field effect tube, etc.

[0054] Please refer to Figure 3 As shown, in another embodiment of the present application, the current limiting device 102 is electrically connected to the control end of the control tube 101, that is, the current limiting device 102 is connected in series between the control end of the control tube 101 and the input interface Pin of the drive circuit. When a voltage is input at the input interface Pin of the drive circuit, by adjusting the resistance value of the current limiting device 102, the input current at the control end of the control tube 101 can be adjusted. And when the control tube 101 is in the amplification region, when adjusting the input current at the control end of the control tube 101, the magnitude of the output current from the first end to the second end of the control tube 101 can be adjusted, thereby achieving the purpose of adjusting the current flowing through the controlled device.

[0055] Please refer to Figure 3 and Figure 4 As shown, in another specific embodiment of the present application, the current limiting device 102 includes a first current limiting resistor R101. By adjusting the magnitude of the resistance value of the first current limiting resistor R101, the magnitude of the input current at the control end of the first triode Q101 can be adjusted. Among them, the input voltage at the input interface Pin of the drive circuit and the resistance value of the current limiting device 102 can be set according to the current requirement of the controlled device. In an embodiment of the present application, the input voltage at the input interface Pin of the drive circuit is, for example, 1V to 5V, then the resistance value range of the current limiting device 102 is, for example, 100Ω to 1KΩ, and specifically can be 510Ω.

[0056] Please refer to Figure 3As shown, in another embodiment of the present application, the voltage divider device 103 is connected in series between the control terminal of the control transistor 101 and the ground terminal GND. At this time, the voltage divider device 103 and the current limiting device 102 are connected in series between the input interface Pin of the drive circuit and the ground terminal GND. The voltage divider device 103 can divide the voltage input to the input interface Pin of the drive circuit, and then can adjust the input voltage of the control terminal of the control transistor 101 to avoid the input voltage of the control transistor 101 being too large or too small. If the input voltage of the control terminal of the control transistor 101 is too large, resulting in the input voltage of the control terminal of the control transistor 101 being greater than the voltage of the first terminal, causing the control transistor 101 to change from the amplification region to the saturation region, then the current from the first terminal to the second terminal of the control transistor 101 can no longer change with the input current of the control terminal, resulting in the uncontrollability of the current of the controlled device. If the input voltage of the control terminal of the control transistor 101 is too small, the control transistor 101 cannot conduct, then the control transistor 101 is in the cut-off region, and the current from the first terminal to the second terminal of the control transistor 101 can no longer change with the input current of the control terminal, resulting in the uncontrollability of the current of the controlled device.

[0057] Please refer to Figure 3 and Figure 4 As shown, in another embodiment of the present application, the voltage divider device 103 includes a voltage dividing resistor R102, and the resistance value of the voltage dividing resistor R102 can be set according to the voltage requirement of the control terminal of the control transistor 101. In this embodiment, the resistance value of the voltage dividing resistor R102 is, for example, equal to 10 KΩ. Among them, the voltage dividing resistor R102 can be a single resistor, or can be realized by two or more resistors connected in series and / or in parallel.

[0058] Please refer to Figure 3 As shown, in another embodiment of the present application, the filtering device 104 is connected in series between the control terminal of the control transistor 101 and the ground terminal GND to filter the control signal input to the control terminal of the control transistor 101.

[0059] Please refer to Figure 3 and Figure 4 As shown, in another embodiment of the present application, the filtering device 104 includes a filtering capacitor C101. The filtering capacitor C101 is connected in series between the control terminal of the control transistor 101 and the ground terminal GND, and forms an RC filter with the first current limiting resistor R101 to realize the filtering of the control signal input to the control terminal of the control transistor 101. Among them, the capacitance value of the filtering capacitor C101 is, for example, equal to 1 nF. And the filtering capacitor C101 can be a single capacitor, or can be realized by two or more capacitors connected in series and / or in parallel.

[0060] Please refer to Figure 3 and Figure 4As shown, in another embodiment of the present application, the current limiting circuit 105 is connected in series between the second end of the control transistor 101 and the ground terminal GND. In this embodiment, the current limiting circuit 105 includes a voltage limiting device and a second current limiting resistor R103. Among them, the voltage limiting device is connected in series between the second end of the control transistor 101 and the ground terminal GND, and the second current limiting resistor R103 is connected in series between the second end of the control transistor 101 and the ground terminal GND. The voltage across the voltage limiting device is less than the set voltage, and the voltage limiting device is connected in parallel with the second current limiting resistor R103, so that the current through the second current limiting resistor R103 is less than the ratio of the set voltage to the resistance value of the second current limiting resistor R103. Since the two ends of the second current limiting resistor R103 and the voltage limiting device are connected in series between the controlled device and the ground terminal GND, the current of the controlled device is equal to the current of the second current limiting resistor R103. Therefore, when the current resistor 105 is working properly, the current of the controlled device is equal to the current of the second current limiting resistor R103 and is less than the ratio of the set voltage to the resistance value of the second current limiting resistor R103. Among them, the set voltage is equal to the voltage limited across the voltage limiting device.

[0061] Please refer to Figure 3 and Figure 4 As shown, in another embodiment of the present application, the voltage limiting device includes a second triode Q102, and the second triode Q102 is an NPN type triode. The base of the second triode Q102 is electrically connected to the second end of the control transistor 101, the collector of the second triode Q102 is electrically connected to the control end of the control transistor 101, and the emitter of the second triode Q102 is electrically connected to the ground terminal GND. At this time, before the second triode Q102 is broken down, the voltage between the base and the emitter of the second triode Q102 is less than or equal to its forward conduction voltage drop, for example, 0.7V, then the set voltage is equal to 0.7V. In other embodiments, the voltage limiting device can be a diode or a voltage stabilizing tube or other devices that can limit voltage.

[0062] Please refer to Figure 3 and Figure 4 As shown, in another embodiment of the present application, the resistance value of the second current limiting resistor R103 is set according to actual needs, so that the current flowing through the controlled device is less than the ratio of the voltage limiting device and the second current limiting resistor R103. In this embodiment, for example, the current flowing through the controlled device is set to be less than 700 mA, then the value of the second current limiting resistor R103 is equal to 1 Ω. In other embodiments, if the current flowing through the controlled device is set to be less than 500 mA, then the value of the second current limiting resistor R103 is equal to 1.4 Ω. Among them, the second current limiting resistor R103 can be a single resistor, or two or more resistors connected in series and / or in parallel.

[0063] Please refer to Figure 3As shown, in another embodiment of the present application, the protection device 106 is serially connected between the first end of the control tube 101 and the output interface Pout of the drive circuit, that is, the protection device 106 is serially connected between the first end of the control tube 101 and the device to be controlled to protect the device to be controlled. When the voltage limiting device is broken down by an abnormally large current in the circuit and the current limiting circuit 105 fails, the protection device 106 can limit the current flowing through the device to be controlled and protect the device to be controlled from the impact of the large current.

[0064] Please refer to Figure 3 and Figure 4 As shown, in another embodiment of the present application, the protection device 106 includes two or more protection resistors connected in parallel. In this embodiment, the protection device 106 includes a first protection resistor R104 and a second protection resistor R105, and the first protection resistor R104 and the second protection resistor R105 are connected in parallel. The resistance values of the first protection resistor R104 and the second protection resistor R105 are, for example, equal to 10 Ω.

[0065] Please refer to Figure 3 and Figure 4 As shown, in an embodiment of the present application, by serially connecting the first end and the second end of the control tube 101 between the device to be controlled and the ground terminal GND, the current of the device to be controlled is made equal to the output current from the first end to the second end of the control tube 101. At the same time, the control tube 101 is set in the amplification region so that the output current from the first end to the second end can be adjusted by adjusting the input current at the control end of the control tube 101. Furthermore, a current limiting device 102 is electrically connected to the control end of the control tube 101. When the input interface Pin of the drive circuit has an input voltage, the input current at the control end of the control tube 101 can be adjusted by adjusting the resistance value of the current limiting device 102. By serially connecting the voltage dividing device 103 between the control end of the control tube 101 and the ground terminal GND, the voltage dividing device 103 can divide the voltage input at the input interface Pin of the drive circuit, and further adjust the input voltage at the control end of the control tube 101 to avoid the input voltage of the control tube 101 being too large or too small and changing the working state of the control tube 101. By serially connecting the filtering device 104 between the control end of the control tube 101 and the ground terminal GND, the control signal input at the control end of the control tube 101 is filtered. By serially connecting the current limiting circuit 105 between the second end of the control tube 101 and the ground terminal GND, the current of the device to be controlled is limited to be below the ratio of the set voltage to the resistance value of the second current limiting resistor R103 to avoid the impact of a large current on the device to be controlled. By serially connecting the protection device 106 between the first end of the control tube 101 and the output interface Pout of the drive circuit, the device to be controlled is protected from the impact of a large current when the current limiting circuit 105 fails.

[0066] A light-emitting diode is a commonly used light-emitting device that emits light by the recombination of electrons and holes and is widely used in the lighting field. The light-emitting diode can be used not only for indicator lighting but also in various aspects such as traffic signal lights, landscape lighting, vehicle lighting, and mobile phone keyboards and backlights. The drive circuit provided in this application can be used as the drive circuit of the light-emitting diode.

[0067] Please refer to Figure 5 As shown, this application also provides a lighting circuit, which includes a drive circuit and a light-emitting diode LED. The anode of the light-emitting diode LED is electrically connected to the power supply Vcc, and the cathode is electrically connected to the output terminal of the drive circuit. Among them, the magnitude of the power supply Vcc needs to be determined according to the supply voltage of the light-emitting diode LED. The drive circuit is connected in series between the cathode of the light-emitting diode LED and the ground terminal GND. By adjusting the input current at the input terminal of the drive circuit, the magnitude of the output current at the output terminal of the drive circuit can be adjusted, and then the current flowing through the light-emitting diode LED can be adjusted, changing the brightness of the light-emitting diode LED so that the brightness of the light-emitting diode LED is stable and adjustable.

[0068] Please refer to Figure 5 As shown, it should be noted that the light-emitting diode LED can be a single light-emitting diode or two or more light-emitting diodes connected in series and / or in parallel.

[0069] Please refer to Figure 5 As shown, in an embodiment of this application, the drive circuit includes a control transistor 101. The first end of the control transistor 101 is electrically connected to the light-emitting diode LED, the second end of the control transistor 101 is electrically connected to the ground terminal GND, and a control signal is input to the control terminal of the control transistor 101 so that the control transistor 101 is in the amplification region. At this time, the output current at the output terminal of the control transistor 101 is controlled by the control signal at the control terminal. When the control signal at the input terminal changes, the output current from the first end to the second end of the control transistor 101 also changes.

[0070] Please refer to Figure 5 As shown, it should be noted that the control signal at the control terminal of the control transistor 101 includes an input current and an input voltage. Specifically, whether to adjust the input current or the input voltage can be determined according to the type of the control transistor 101.

[0071] Please refer to Figure 5 and Figure 6As shown, in an embodiment of the present application, the control tube 101 includes a first triode Q101, and the first triode Q101 is an NPN-type triode. The control signal at the control end of the control tube 101 is an input current. At this time, the collector of the first triode Q101 is electrically connected to the cathode of the light-emitting diode LED, the collector is electrically connected to the ground terminal GND, and the base inputs the control signal. And to ensure that the first triode Q101 operates in the amplification region, the voltages at the three terminals of the first triode Q101 are set as follows: the voltage at the collector of the first triode Q101 is greater than the voltage at the base, and the voltage at the base of the first triode Q101 is greater than the voltage at the emitter. When the first triode Q101 operates in the amplification region, the output current from the collector to the emitter of the first triode Q101 is controlled by the input current at the base. Therefore, by adjusting the input current at the base of the first triode Q101, the current flowing through the light-emitting diode LED can be adjusted.

[0072] Please refer to Figure 5 and Figure 6 As shown, in other embodiments, the control tube 101 can also be other control tubes 101 having an amplification region, such as a field effect tube, etc.

[0073] Please refer to Figure 5 As shown, in an embodiment of the present application, the drive circuit further includes a current limiting device 102. The current limiting device 102 is electrically connected to the control end of the control tube 101, that is, the current limiting device 102 is connected in series between the control end of the control tube 101 and the input interface Pin of the drive circuit. When a voltage is input at the input interface Pin of the drive circuit, by adjusting the resistance value of the current limiting device 102, the input current at the control end of the control tube 101 can be adjusted. And when the control tube 101 is in the amplification region, when adjusting the input current at the control end of the control tube 101, the magnitude of the output current from the first end to the second end of the control tube 101 can be adjusted, thereby achieving the purpose of adjusting the current flowing through the light-emitting diode LED and changing the brightness of the light-emitting diode LED.

[0074] Please refer to Figure 5 and Figure 6 As shown, in an embodiment of the present application, the current limiting device 102 includes a first current limiting resistor R101. By adjusting the magnitude of the first current limiting resistor R101, the magnitude of the input current at the control end of the first triode Q101 can be adjusted. Among them, the input voltage at the input interface Pin of the drive circuit and the resistance value of the current limiting device 102 can be set according to the current requirement of the light-emitting diode LED. In an embodiment of the present application, the voltage input at the input interface Pin of the drive circuit is, for example, 1V to 5V, then the resistance value range of the current limiting device 102 is, for example, 100Ω to 1KΩ, and specifically can be 510Ω.

[0075] Please refer to Figure 5 and Figure 6As shown, in an embodiment of the present application, the drive circuit further includes a voltage divider device 103, and the voltage divider device 103 is connected in series between the control end of the control transistor 101 and the ground terminal GND. At this time, the voltage divider device 103 and the current limiting device 102 are connected in series between the input interface Pin of the drive circuit and the ground terminal GND. The voltage divider device 103 can divide the voltage input to the input interface Pin of the drive circuit, and then can adjust the input voltage of the control end of the control transistor 101 to avoid the input voltage of the control transistor 101 being too large or too small. If the input voltage of the control end of the control transistor 101 is too large, resulting in the input voltage of the control end of the control transistor 101 being greater than the voltage of the first end, causing the control transistor 101 to change from the amplification region to the saturation region, then the current from the first end to the second end of the control transistor 101 can no longer change with the input current of the control end, resulting in the current of the light-emitting diode LED being uncontrollable. If the input voltage of the control end of the control transistor 101 is too small, the control transistor 101 cannot be turned on, then the control transistor 101 is in the cut-off region, and the current from the first end to the second end of the control transistor 101 can no longer change with the input current of the control end, resulting in the current of the light-emitting diode LED being uncontrollable.

[0076] Please refer to Figure 5 and Figure 6 As shown, in an embodiment of the present application, the voltage divider device 103 includes a voltage dividing resistor R102, and the resistance value of the voltage dividing resistor R102 is, for example, equal to 10 KΩ. Among them, the voltage dividing resistor R102 can be a single resistor, or can be realized by two or more resistors connected in series and / or in parallel.

[0077] Please refer to Figure 5 As shown, in an embodiment of the present application, the drive circuit further includes a filtering device 104, and the filtering device 104 is connected in series between the control end of the control transistor 101 and the ground terminal GND to filter the control signal input to the control end of the control transistor 101.

[0078] Please refer to Figure 5 and Figure 6 As shown, in an embodiment of the present application, the filtering device 104 includes a filtering capacitor C101, and the filtering capacitor C101 is connected in series between the control end of the control transistor 101 and the ground terminal GND, and forms an RC filter with the first current limiting resistor R101 to realize the filtering of the control signal input to the control end of the control transistor 101. Among them, the capacitance value of the filtering capacitor C101 is, for example, equal to 1 nF. And the filtering capacitor C101 can be a single capacitor, or can be realized by two or more capacitors connected in series and / or in parallel.

[0079] Please refer to Figure 5 and Figure 6As shown, in an embodiment of the present application, the drive circuit further includes a current limiting circuit 105, and the current limiting circuit 105 is connected in series between the second end of the control transistor 101 and the ground terminal GND. In this embodiment, the current limiting circuit 105 includes a voltage limiting device and a second current limiting resistor R103. Among them, the voltage limiting device is connected in series between the second end of the control transistor 101 and the ground terminal GND, and the second current limiting resistor R103 is connected in series between the second end of the control transistor 101 and the ground terminal GND. The voltage across the voltage limiting device is less than the set voltage, and the voltage limiting device is connected in parallel with the second current limiting resistor R103, so that the current through the second current limiting resistor R103 is less than the ratio of the set voltage to the resistance value of the second current limiting resistor R103. Since the two ends of the second current limiting resistor R103 and the voltage limiting device are connected in series between the light-emitting diode LED and the ground terminal GND, the current of the light-emitting diode LED is equal to the current of the second current limiting resistor R103. Therefore, when the current resistor 105 is working properly, the current of the light-emitting diode LED is equal to the current of the second current limiting resistor R103 and is less than the ratio of the set voltage to the resistance value of the second current limiting resistor R103. Among them, the set voltage is equal to the voltage limited across the voltage limiting device.

[0080] Please refer to Figure 5 and Figure 6 As shown, in an embodiment of the present application, the voltage limiting device includes a second triode Q102, and the second triode Q102 is an NPN type triode. The base of the second triode Q102 is electrically connected to the second end of the control transistor 101, the collector of the second triode Q102 is electrically connected to the control end of the control transistor 101, and the emitter of the second triode Q102 is electrically connected to the ground terminal GND. At this time, before the second triode Q102 is broken down, the voltage between the base and the emitter of the second triode Q102 is less than or equal to its forward conduction voltage drop, for example, 0.7V, so the set voltage is equal to 0.7V. In other embodiments, the voltage limiting device can be a diode or a voltage stabilizing tube or other devices that can limit voltage.

[0081] Please refer to Figure 5 and Figure 6 As shown, in an embodiment of the present application, the resistance value of the second current limiting resistor R103 is set according to actual needs, so that the current flowing through the light-emitting diode LED is less than the ratio of the voltage limiting device and the second current limiting resistor R103. In this embodiment, for example, the current flowing through the light-emitting diode LED is set to be less than 700 mA, then the value of the second current limiting resistor R103 is equal to 1 Ω. In other embodiments, if the current flowing through the light-emitting diode LED is set to be less than 500 mA, then the value of the second current limiting resistor R103 is equal to 1.4 Ω. Among them, the second current limiting resistor R103 can be a single resistor, or two or more resistors connected in series and / or in parallel.

[0082] Please refer to Figure 5 andFigure 6 As shown, in an embodiment of the present application, the driving circuit further includes a protection device 106. The protection device 106 is connected in series between the first end of the control transistor 101 and the light-emitting diode LED to protect the light-emitting diode LED. When the voltage-limiting device is broken down by an abnormally large current that appears in the circuit and the current-limiting circuit 105 fails, the protection device 106 can limit the current flowing through the light-emitting diode LED to protect the light-emitting diode LED from the impact of the large current.

[0083] Please refer to Figure 5 and Figure 6 As shown, in an embodiment of the present application, the protection device 106 includes two or more protection resistors connected in parallel. In this embodiment, the protection device 106 includes a first protection resistor R104 and a second protection resistor R105, and the first protection resistor R104 and the second protection resistor R105 are connected in parallel. The resistance values of the first protection resistor R104 and the second protection resistor R105 are, for example, equal to 10 Ω.

[0084] Please refer to Figure 5 and Figure 6 As shown, a light-emitting circuit provided by the present application electrically connects the first end of the driving circuit to the cathode of the light-emitting diode LED, electrically connects the second end of the driving circuit to the ground terminal, and inputs a voltage of 1V to 5V at the input interface Pin of the driving circuit. After a voltage of 1V to 5V is input at the input interface Pin of the driving circuit, the input voltage is divided by the first current-limiting resistor R101 and the voltage-dividing resistor R102 to provide an input voltage for the input end of the first triode Q101. At the same time, it is specified that the voltage at the collector of the first triode Q101 is greater than the voltage at the base, and the voltage at the base is greater than the voltage at the emitter. The first triode Q101 conducts and is in the amplification region, and the current from the collector to the emitter of the first triode Q101 changes with the current at the base. Then, the second triode Q102 also conducts. Then, the maximum voltage between the base and the emitter of the second triode Q102 is equal to 0.7V, thereby limiting the current flowing through the light-emitting diode LED to below 700 mA.

[0085] Please refer to Figure 7 As shown, in the present application, the light-emitting diode LED can be used in a vehicle. In an embodiment of the present application, the light-emitting diode LED is used on a scooter as the headlight of the scooter, and then the driving circuit is used as the driving circuit of the scooter headlight. In other embodiments, the light-emitting diode LED can be used as the headlight of other vehicles such as bicycles, electric vehicles, motorcycles or cars, and the driving circuit is used as the driving circuit of the headlights of other vehicles such as bicycles, electric vehicles, motorcycles or cars.

[0086] In summary, the present utility model provides a driving circuit, a lighting circuit and a scooter. The lighting circuit and the scooter include the driving circuit, and the driving circuit includes a control transistor and a current-limiting resistor. By connecting the first end and the second end of the control transistor in series between the device to be controlled and the ground terminal, the current of the device to be controlled is equal to the output current from the first end to the second end of the control transistor. At the same time, the control transistor is set in the amplification region, so that the output current from the first end to the second end can be adjusted by adjusting the input current of the control terminal of the control transistor. Furthermore, a current-limiting device is electrically connected to the control terminal of the control transistor. When the input interface of the driving circuit has an input voltage, the input current of the control terminal of the control transistor can be adjusted by adjusting the resistance value of the current-limiting device, so as to achieve the purpose of flexibly controlling the current of the device to be controlled.

[0087] The embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present utility model, so that those skilled in the art can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A driving circuit, characterized in that, At least include: A control tube, the first end of the control tube is electrically connected to the device to be controlled, the second end of the control tube is electrically connected to the ground terminal, and a control signal is input to the control end of the control tube to make the control tube in the amplification region; And A current-limiting device, the current-limiting device is connected in series between the control end of the control tube and the control port to adjust the input current of the control end.

2. The drive circuit according to claim 1, wherein The control tube includes a first triode, the collector of the first triode is electrically connected to the device to be controlled, the emitter of the first triode is electrically connected to the ground terminal, and the voltage of the collector of the first triode is greater than the voltage of the base, and the voltage between the collector and the base of the first triode is greater than the voltage of the emitter.

3. The drive circuit according to claim 2, wherein The first triode is an NPN type triode.

4. A driving circuit according to claim 1, wherein The current-limiting device includes a first current-limiting resistor, and the first current-limiting resistor is connected in series between the control end of the control tube and the control port.

5. A driving circuit according to claim 1, characterized in that, The drive circuit further includes a voltage-dividing device, and the voltage-dividing device is connected in series between the control end of the control tube and the ground terminal.

6. The drive circuit according to claim 5, characterized in that The voltage-dividing device includes a voltage-dividing resistor, and the voltage-dividing resistor is connected in series between the control end of the control tube and the ground terminal.

7. The drive circuit according to claim 1, characterized in that, The drive circuit further includes a current-limiting circuit, and the current-limiting circuit is connected in series between the second end of the control tube and the ground terminal.

8. A driving circuit according to claim 7, wherein And the current-limiting circuit includes: A voltage-limiting device, the voltage-limiting device is connected in series between the second end of the control tube and the ground terminal; and A second current resistor, the second current resistor is connected in series between the second end of the control tube and the ground terminal.

9. A driving circuit according to claim 8, wherein, The voltage-limiting device includes a second triode, the base of the second triode is electrically connected to the second end of the control tube, the collector of the second triode is electrically connected to the control end of the control tube, and the emitter of the second triode is electrically connected to the ground terminal.

10. A driving circuit according to claim 9, characterized in that, The second triode is an NPN type triode.

11. A driving circuit according to claim 1, wherein, The drive circuit further includes a protection device, and the protection device is connected in series between the first end of the control tube and the device to be controlled.

12. A driving circuit according to claim 11, characterized in that, The protection device includes at least two protection resistors connected in parallel, and the protection resistors are connected in series between the first end of the control tube and the device to be controlled.

13. A driving circuit according to claim 1, wherein The drive circuit further includes a filtering device, and the filtering device is connected in series between the control end of the control tube and the ground terminal.

14. A driving circuit according to claim 13, wherein, The filtering device includes a filtering capacitor, and the filtering capacitor is connected in series between the control end of the control tube and the ground terminal.

15. A light-emitting circuit, characterized in that, The light-emitting circuit includes: A light-emitting diode; and The drive circuit according to any one of claims 1 to 14.

16. A scooter, characterized in that, The scooter includes the light-emitting circuit according to claim 15.

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