Digital automobile door lock state display circuit

Abstract

The utility model discloses a digital automobile door lock state display circuit, and relates to the technical field of door lock circuits. Comprising an indicating lamp LED and a triode Q8, a collector electrode of the triode Q8 is connected with an LEDLOCK interface of the indicating lamp LED, an emitting electrode of the triode Q8 is connected with a + 12V end of a power supply, and a base electrode of the triode Q8 is connected with a door lock state lamp output interface MCULEDLOCK. According to the circuit in the utility model, the power consumption of an independent indicating lamp is not too high, the cost of a first driving mode for lightening an LED is high, the capacity of a second driving mode is excessive, and resources are wasted; a triode Q8 is used as a linear adjusting circuit to amplify the current of a base electrode so as to drive stable lighting of an LED; through the mode, a driving circuit is omitted, the driving circuit is simplified, the cost is reduced, large current can be driven to make constant output for the LED, and good experience is brought to a user.

Description

Technical Field

[0001] The utility model relates to the technical field of door lock circuits, in particular to a digital automobile door lock state display circuit. Background Art

[0002] A car's door lock system primarily consists of three components: the door lock switch, the door lock actuator, and the door lock controller. The door lock actuator, controlled by the door lock controller, performs the locking and unlocking tasks. The door lock controller provides the lock / unlock pulse current to the door lock actuator, controlling the direction of the current flowing through the actuator. A car's door lock indicator light typically indicates the status of the vehicle's door lock system. An illuminated door lock indicator light may indicate that the door is not fully locked, or that there is a problem with an internal switch.

[0003] If a car door is not closed properly, the indicator light will usually be on. If you simply use the IO port of the microcontroller to light the light, the brightness will be dim due to limited driving capability, and the prompt will not be obvious. If you need to increase the brightness, you need to add a driving circuit, which is relatively expensive. Utility Model Content

[0004] The purpose of the present utility model is to provide a digital automobile door lock status display circuit to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A digital automobile door lock status display circuit includes an indicator LED,

[0007] It also includes a transistor Q8, the collector of the transistor Q8 is connected to the LED_LOCK interface of the indicator LED;

[0008] The emitter of the transistor Q8 is connected to the +12V terminal of the power supply, and the base of the transistor Q8 is connected to the door lock status light output interface MCU_LED_LOCK; the transistor Q8 acts as a linear adjustment circuit to amplify the base current, thereby driving the LED to light up stably.

[0009] Preferably, an external capacitor C63 is connected between the collector of the transistor Q8 and the LED_LOCK interface of the indicator LED, and the capacitor C63 is grounded; connecting the collector of the transistor Q8 to the capacitor C63 can enhance the AC amplification effect of the circuit, improve the sensitivity and amplification factor of the circuit, thereby ensuring the signal quality output by the circuit; connecting the collector of the transistor Q8 to the capacitor C63 can reduce the influence of the static bias resistor on the AC signal, and improve the working efficiency and stability of the circuit; connecting the collector of the transistor Q8 to the capacitor C63 can also protect the transistor Q8 and avoid damage to the transistor Q8 by the static bias resistor.

[0010] Preferably, the emitter of the transistor Q8, the resistor R45, the resistor R48 and the base of the transistor Q8 are connected in series in sequence, and the +12V end of the power supply is electrically connected between the resistor R45 and the resistor R48; the series resistor between the emitter and the base of the transistor Q8 has multiple functions in the transistor circuit, including stabilizing the bias point, preventing self-oscillation, improving switching performance, preventing mis-conduction, and forming a bias network; these functions together ensure the stability and efficiency of the transistor circuit.

[0011] Preferably, an external transistor Q7 is connected between the resistor R45 and the resistor R48, the emitter of the transistor Q7 is electrically connected between the resistor R45 and the resistor R48, the base of the transistor Q7 is electrically connected between the resistor R45 and the emitter of the transistor Q8, and the collector of the transistor Q7 is electrically connected between the resistor R48 and the base of the transistor Q8; when the base of the transistor Q7 and the emitter of the transistor Q8 are connected, the current amplification function can be realized; the basic working principle of the transistor is to amplify the larger collector current by controlling the smaller base current.

[0012] Preferably, the circuit further comprises a transistor Q9, wherein the collector of the transistor Q9 is connected to the base of the transistor Q8 via a resistor R49; the collector of the transistor Q9 and the base of the transistor Q8 are connected to form a Darlington transistor circuit; when the collector current of the first transistor increases, the base current of the second transistor also increases, thereby further amplifying the current;

[0013] The base of the transistor Q9 is connected to the door lock status light output interface MCU_LED_LOCK through the resistor R50.

[0014] Preferably, an external resistor R53 is connected between the base of the transistor Q9 and the resistor R50, the resistor R53 is connected to the emitter of the transistor Q9, and the resistor R53 and the emitter of the transistor Q9 are grounded; the series resistor R53 between the emitter and the base of the transistor Q9 has multiple functions in the transistor circuit, including stabilizing the bias point, preventing self-oscillation, improving switching performance, preventing mis-conduction, and forming a bias network; these functions together ensure the stability and efficiency of the transistor circuit.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0016] The circuit in the present invention has a low power consumption for a single indicator light. Using a driver to light up the LED is firstly costly, and secondly, the driver capacity is too much in excess, which wastes resources. The transistor Q8 is used as a linear adjustment circuit to amplify the base current, thereby driving the LED to light stably. In this way, the driver circuit is omitted, the driver circuit is simplified, and the cost is reduced. At the same time, a larger current can be driven to provide a constant output to the LED, giving the user a better experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a circuit diagram of the entire utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the utility model provides a technical solution: a digital automobile door lock status display circuit, including an indicator LED and a transistor Q8, wherein the collector of the transistor Q8 is connected to the LED_LOCK interface of the indicator LED; the emitter of the transistor Q8 is connected to the +12V terminal of the power supply, and the base of the transistor Q8 is connected to the door lock status light output interface MCU_LED_LOCK; the transistor Q8 is used as a linear adjustment circuit to amplify the base current, thereby driving the LED to light stably;

[0021] An external capacitor C63 is connected between the collector of the transistor Q8 and the LED_LOCK interface of the indicator LED, and the capacitor C63 is grounded. The external capacitor C63 is connected to the collector of the transistor Q8 to amplify the AC signal: the connection of the capacitor C63 to the collector of the transistor Q8 can enhance the AC amplification effect of the circuit, improve the sensitivity and amplification factor of the circuit, thereby ensuring the signal quality of the circuit output; the influence of the static bias resistor on the AC signal can be reduced: the influence of the static bias resistor on the AC signal can cause the circuit to work unstable or even unable to work; the connection of the capacitor C63 to the collector of the transistor Q8 can reduce the influence of the static bias resistor on the AC signal, improve the working efficiency and stability of the circuit; and can protect the transistor Q8: the connection of the capacitor C63 to the collector of the transistor Q8 can also protect the transistor Q8 and avoid damage to the transistor Q8 by the static bias resistor.

[0022] The emitter of the transistor Q8, the resistor R45, the resistor R48, and the base of the transistor Q8 are connected in series in sequence, and the +12V terminal of the power supply is electrically connected between the resistor R45 and the resistor R48. The series resistor between the emitter and the base of the transistor Q8 has multiple functions in the transistor circuit, including stabilizing the bias point, preventing self-oscillation, improving switching performance, preventing mis-conduction, and forming a bias network. These functions jointly ensure the stability and efficiency of the transistor circuit.

[0023] An external transistor Q7 is connected between the resistor R45 and the resistor R48, the emitter of the transistor Q7 is electrically connected between the resistor R45 and the resistor R48, the base of the transistor Q7 is electrically connected between the resistor R45 and the emitter of the transistor Q8, and the collector of the transistor Q7 is electrically connected between the resistor R48 and the base of the transistor Q8; when the base of the transistor Q7 and the emitter of the transistor Q8 are connected, a current amplification function can be achieved; the basic working principle of the transistor is to amplify a larger collector current by controlling a smaller base current; when an input signal acts on the base of a transistor, the emitter current of the transistor will increase, and then by connecting the emitter of another transistor, the collector current of the second transistor will also increase, thereby achieving a current amplification effect, and the base of the transistor Q7 and the emitter of the transistor Q8 are connected to form a Darlington transistor to obtain a larger current;

[0024] The circuit further includes a transistor Q9, the collector of which is connected to the base of the transistor Q8 via a resistor R49; the base of the transistor Q9 is connected to the door lock status light output interface MCU_LED_LOCK via a resistor R50; the collector of the transistor Q9 and the base of the transistor Q8 are connected to form a Darlington transistor circuit. A Darlington transistor is formed by connecting two or more transistors in a specific manner, and its amplification factor is equal to the product of the amplification factors of each transistor; when the collector current of the first transistor increases, the base current of the second transistor also increases, thereby further amplifying the current;

[0025] An external resistor R53 is connected between the base of the transistor Q9 and the resistor R50, and the resistor R53 is connected to the emitter of the transistor Q9. The resistor R53 and the emitter of the transistor Q9 are grounded. The series resistor R53 between the emitter and the base of the transistor Q9 has multiple functions in the transistor circuit, including stabilizing the bias point, preventing self-oscillation, improving switching performance, preventing mis-conduction, and forming a bias network. These functions together ensure the stability and efficiency of the transistor circuit.

[0026] Specific working principle:

[0027] The circuit of the present invention uses transistor Q8 as a linear adjustment circuit to amplify the base current, thereby driving the LED to light up stably. For a separate indicator light, the power consumption is not too high. Using a driver to light up the LED is firstly costly, and secondly, the driving capacity is too much, which wastes resources.

[0028] In this way, the driving circuit is omitted, the driving circuit is simplified, and the cost is reduced; at the same time, a larger current can be driven to provide a constant output to the LED, bringing a better experience to the user.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A digital automobile door lock status display circuit, including an indicator LED, characterized in that: It also includes a transistor Q8, the collector of the transistor Q8 is connected to the LED_LOCK interface of the indicator LED; The emitter of the transistor Q8 is connected to the +12V terminal of the power supply, and the base of the transistor Q8 is connected to the door lock status light output interface MCU_LED_LOCK.

2. The digital automobile door lock status display circuit according to claim 1, characterized in that: An external capacitor C63 is connected between the collector of the transistor Q8 and the LED_LOCK interface of the indicator LED, and the capacitor C63 is grounded.

3. The digital automobile door lock status display circuit according to claim 1, characterized in that: The emitter of the transistor Q8, the resistor R45, the resistor R48 and the base of the transistor Q8 are connected in series in sequence, and the +12V end of the power supply is electrically connected between the resistor R45 and the resistor R48.

4. The digital automobile door lock status display circuit according to claim 3, characterized in that: An external transistor Q7 is connected between the resistor R45 and the resistor R48, the emitter of the transistor Q7 is electrically connected between the resistor R45 and the resistor R48, the base of the transistor Q7 is electrically connected between the resistor R45 and the emitter of the transistor Q8, and the collector of the transistor Q7 is electrically connected between the resistor R48 and the base of the transistor Q8.

5. The digital automobile door lock status display circuit according to claim 1, characterized in that: It also includes a transistor Q9, the collector of the transistor Q9 is connected to the base of the transistor Q8 through a resistor R49; The base of the transistor Q9 is connected to the door lock status light output interface MCU_LED_LOCK through the resistor R50.

6. The digital automobile door lock status display circuit according to claim 5, characterized in that: An external resistor R53 is connected between the base of the transistor Q9 and the resistor R50. The resistor R53 is connected to the emitter of the transistor Q9. A grounding process is performed between the resistor R53 and the emitter of the transistor Q9.

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