An enable control circuit for a linear chip

Abstract

This utility model relates to the field of control circuit technology, specifically an enable control circuit for a linear chip. It includes a conversion module connected between a chip control circuit and the chip. The chip control circuit is connected between a power supply and a vehicle light. The power supply powers the chip. The conversion module switches the chip to an enabled state when the chip is high and to a disabled state when the chip is low. The conversion module includes voltage divider resistors R4, R5, R6, and R8, a filter capacitor C4, an NPN transistor T1, and an NPN transistor T2. This utility model not only enables or disables the linear chip independently but also performs level conversion at the hardware level, avoiding situations where the EN pin voltage of the linear chip is greater than the VS pin voltage. This reduces software logic judgments and lowers the complexity of software design.

Description

Technical Field

[0001] This utility model relates to the field of control circuit technology, specifically to an enable control circuit for a linear chip. Background Technology

[0002] In the field of electronic circuit design, the enable control of linear chips is one of the key aspects of realizing circuit functions. Taking the linear chip NSL21611 as an example, the control method of its enable pin has a significant impact on the performance and reliability of the circuit. In the existing technology, enable control is mainly achieved by directly controlling the enable pin of the linear chip NSL21611 using the MCU's I / O.

[0003] While this control method allows for individual control of the chip's enable pin, improving circuit flexibility and controllability, the chip has strict requirements on the voltage timing of the enable pin (EN pin) and the power pin (VS pin). The voltage at the EN pin cannot exceed that at the VS pin. This necessitates that the MCU ensure the EN pin is powered on before the VS pin in the logic control, placing high demands on software and hardware coordination. In practical applications, due to insufficient communication between software and hardware designers or design oversights, the EN pin voltage can easily exceed that of the VS pin, leading to the failure of the NSL21611 linear chip, reducing circuit reliability and stability, and potentially even adversely affecting the entire system.

[0004] To address this, an enable control circuit for a linear chip is proposed. Utility Model Content

[0005] The purpose of this invention is to provide an enable control circuit for a linear chip, which outputs an MCU EN signal through the I / O port of the linear chip, enabling independent control of the enable and disable of the vehicle lighting circuit.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An enable control circuit for a linear chip includes a switching module connected between a chip control circuit and the chip. The chip control circuit is connected between a power supply and a vehicle light. The power supply powers the chip. The switching module switches the chip to an enabled state when the chip is high and switches the chip to a disabled state when the chip is low.

[0008] Furthermore, the conversion module includes voltage divider resistors R4, R5, R6, and R8, filter capacitor C4, NPN transistor T1, and NPN transistor T2. The voltage divider resistor R6 is connected in series between the chip's enable signal and NPN transistor T2. The filter capacitor C4 is connected in parallel between NPN transistor T2 and ground. The voltage divider resistor R5 is connected between NPN transistor T2 and ground. The voltage divider resistor R8 is connected between NPN transistor T2 and the chip's enable terminal EN. The NPN transistor T1 is connected between voltage divider resistor R4 and NPN transistor T2, and the emitter of NPN transistor T1 is connected to the power supply.

[0009] Furthermore, the conversion module also includes a filter capacitor C3, which is connected in parallel between the two ends of the voltage divider resistor R4.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This application can not only enable or disable the linear chip individually, but also perform level conversion at the hardware level, which can avoid the situation where the voltage of the EN pin of the linear chip is greater than the voltage of the VS pin, thereby reducing software logic judgment and reducing the complexity of software design. Attached Figure Description

[0012] Figure 1 This is a modular structure diagram of the present invention;

[0013] Figure 2 This is a circuit structure diagram of the present invention;

[0014] Figure 3 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1 to 3 This utility model provides an enable control circuit for a linear chip, the technical solution of which is as follows:

[0017] An enable control circuit for a linear chip includes a switching module connected between a chip control circuit and the chip. The chip control circuit is connected between a power supply and a vehicle light. The power supply supplies power to the chip. The switching module switches the chip to an enabled state when the chip is high and switches the chip to a disabled state when the chip is low.

[0018] Preferably, the conversion module includes voltage divider resistors R4, R5, R6, and R8, a filter capacitor C4, an NPN transistor T1, and an NPN transistor T2. Voltage divider resistor R6 is connected in series between the chip's enable signal and the NPN transistor T2. R6 limits the current of the MCU EN signal, protecting the NPN transistor T2 from damage by excessive current. Filter capacitor C4 is connected in parallel between the NPN transistor T2 and ground, filtering out high-frequency noise in the MCU EN signal, stabilizing the signal level, and preventing false triggering. Voltage divider resistor R5 is connected between the NPN transistor T2 and ground. The base of the NPN transistor T2 is connected to the MCU EN signal line through voltage divider resistor R6 and filter capacitor C4, and its emitter is directly connected to GND. When the MCU... When the EN signal is low, it provides a discharge path for the base of NPN transistor T2, ensuring reliable cutoff. Voltage divider resistor R8 is connected between NPN transistor T2 and the chip's enable terminal EN, acting as a pull-up resistor. When NPN transistor T2 is off, it provides a high level to the IC EN signal line, ensuring the subsequent vehicle lighting load is disabled. NPN transistor T1 is connected between voltage divider resistor R4 and NPN transistor T2, and the emitter of NPN transistor T1 is connected to the power supply. When the MCU... When EN sends a high level, current flows into the base of NPN transistor T2 through voltage divider resistors R6 and R5, turning on NPN transistor T2 and making the resistance between its collector and emitter very small. When MCUEN sends a low level, the base current of NPN transistor T2 is cut off, turning on NPN transistor T2 and making the resistance between its collector and emitter very large. The conversion module also includes a filter capacitor C3, which is connected in parallel across voltage divider resistor R4. The filter capacitor C3 and voltage divider resistor R4 form a filter circuit to filter the base signal of NPN transistor T1, improving signal stability and preventing NPN transistor T1 from being falsely triggered due to signal jitter.

[0019] Working principle: When MCU EN sends a high level, current flows into the base of NPN transistor T2 through voltage divider resistors R6 and R5, NPN transistor T2 is in the conducting state, IC EN is pulled low, enabling the subsequent vehicle light load. At the same time, the collector current of NPN transistor T2 flows into the base of NPN transistor T1 through voltage divider resistor R4, NPN transistor T1 is turned on, VS outputs a low level, providing power to the subsequent circuit.

[0020] When MCU EN sends a low level, NPN transistor T2 is in the off state, IC EN remains high under the action of voltage divider resistor R8, disabling the subsequent vehicle light load. At the same time, the base current of NPN transistor T1 is cut off, NPN transistor T1 is cut off, VS outputs a high level, cutting off the power supply to the subsequent circuit.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An enable control circuit for a linear chip, characterized by: The device includes a conversion module connected between a chip control circuit and a chip. The chip control circuit is connected between a power supply and a vehicle light. The power supply powers the chip. The conversion module switches the chip to an enabled state when the chip is high and switches the chip to a disabled state when the chip is low.

2. The enable control circuit for linear chips of claim 1, wherein: The conversion module includes voltage divider resistors R4, R5, R6, and R8, filter capacitor C4, NPN transistor T1, and NPN transistor T2. Voltage divider resistor R6 is connected in series between the chip's enable signal and NPN transistor T2. Filter capacitor C4 is connected in parallel between NPN transistor T2 and ground. Voltage divider resistor R5 is connected between NPN transistor T2 and ground. Voltage divider resistor R8 is connected between NPN transistor T2 and the chip's enable terminal EN. NPN transistor T1 is connected between voltage divider resistor R4 and NPN transistor T2, and the emitter of NPN transistor T1 is connected to the power supply.

3. The enable control circuit for linear chips of claim 1, wherein: The conversion module also includes a filter capacitor C3, which is connected in parallel between the two ends of the voltage divider resistor R4.

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