Automobile power amplifier undervoltage indicating lamp circuit

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By designing a undervoltage indicator light circuit for automotive amplifier products, using a combination of DC power supply, voltage stabilization module and early warning module to monitor and reflect the changes in the power supply voltage, the problem of lack of power supply undervoltage indication in the prior art is solved, and real-time warning and equipment protection for insufficient power supply are achieved.

CN222896212UActive Publication Date: 2025-05-23东莞市天逸电子有限公司

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Patent Information

Application Number: CN202421098178.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-20
Publication Date: 2025-05-23
Estimated Expiration: 2034-05-20

AI Technical Summary

Technical Problem

Existing automotive amplifier products lack power supply undervoltage indicators, which leads to inability to monitor and warn in real time when power supply is insufficient, which may cause the audio system to fail to work properly or sound distorted, affecting driving safety.

Method used

Design a vehicle power amplifier undervoltage indicator light circuit, including a DC power supply, a voltage stabilization module and an early warning module. Through a series circuit and a combination of transistors, voltage stabilization diodes, and light emitting diodes, the change in the supply voltage is monitored and reflected. If the voltage is less than 10.5VDC, the light emitting diode LED 1 will light up and flash, prompting the user to provide too low power.

Benefits of technology

Real-time monitoring and warning of the power supply voltage of automotive amplifier products is realized, equipment failure and sound distortion when power supply is insufficient, power supply of amplifier products and automotive systems is protected, and driving safety is ensured.

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Patent Text Reader

Abstract

The utility model discloses an automobile power amplifier undervoltage indicating lamp circuit which comprises a direct current power supply, a charging module, a voltage dividing module, a voltage stabilizing module and an early warning module. The direct-current power supply continuously provides stable voltage for the circuit, the charging module is controlled by the voltage of the direct-current power supply, when the voltage is higher than a set value of the circuit, the charging module continuously charges, the voltage of the early warning module is limited in an interval range by the voltage stabilizing module, and the voltage is divided by the voltage dividing module; when the voltage is lower than a circuit set value, the charging module cannot continuously charge, the voltage stabilizing module cannot meet the voltage requirement, the current passes through the early warning module, the early warning module gives out early warning, and the light emitting diode can flicker to prompt a user that the working voltage is too low to turn off the sound system or turn down the volume; the power amplifier protection circuit has the advantages of being low in cost, convenient to use and the like, and the power supply of an automobile system is prevented from being continuously consumed.

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Description

Technical Field

[0001] The utility model relates to the field of indicator light circuits, in particular to an automobile power amplifier undervoltage indicator light circuit. Background Art

[0002] Power problems are one of the common causes of audio system failure. If the vehicle's DC power supply voltage is low, the fuse is blown, or the wires are broken, the audio system may not work properly. In addition, poor grounding or corrosion of the DC power terminals may also cause power problems in the audio system. The internal components of the audio system, such as amplifiers, speakers, or radio receivers, may be worn or damaged due to overheating or friction due to long-term use. Short circuits or broken solder joints on the internal circuit boards are also common causes of equipment failure.

[0003] At present, all car amplifier products generally only have normal working indicator lights and fault protection indicator lights, but no power supply undervoltage indicator lights. Because the products are installed in the car, they are powered by a 12VDC car DC power supply. When the car audio system is turned on and used, especially under long-term high-power conditions, part of the car DC power supply will be consumed. If the voltage is low, the entire audio system will not work in the best state or the sound will be easily distorted due to insufficient power supply. In addition, the amplifier product will affect driving when the power supply is insufficient, and may continue to consume the power of the car system. How to monitor the audio input power supply voltage in real time and transmit this information to the driver has become an urgent problem that technical personnel in this field need to solve. Utility Model Content

[0004] The utility model aims to provide an automobile power amplifier undervoltage indicator light circuit to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] Provided is a car amplifier undervoltage indicator light circuit, including a DC power supply, a voltage stabilizing module and an early warning module;

[0007] Both ends of the early warning module are connected to a DC power supply. The early warning module is provided with a first triode, a second triode and a light-emitting diode. The emitter of the first triode is connected to the light-emitting diode, the base of the first triode is connected to the voltage stabilizing module, the collector of the first triode is connected to the base of the second triode, and the emitter of the second triode and the anode of the light-emitting diode are respectively connected to the DC power supply to form a series circuit.

[0008] Furthermore, the voltage stabilizing module is provided with a voltage stabilizing diode, and the voltage of the voltage stabilizing diode is within the range of voltage that can be provided by the DC power supply.

[0009] Furthermore, the anode of the voltage stabilizing diode is connected to the emitter of the first transistor, and the cathode of the voltage stabilizing diode is connected to the emitter of the second transistor.

[0010] Furthermore, it includes a sixth resistor, and both ends of the sixth resistor are respectively connected to the cathode of the voltage stabilizing diode and the emitter of the second transistor.

[0011] Furthermore, it includes a capacitor, and both ends of the capacitor are respectively connected to the voltage stabilizing module to form a parallel connection.

[0012] Furthermore, it includes a first resistor, a second resistor, a third resistor and a fifth resistor, which are connected in sequence to form a series connection, and the first resistor and the fifth resistor are respectively connected to a DC power supply.

[0013] Furthermore, the anode of the light emitting diode is connected to the first resistor, and the cathode is connected to the second triode, the third resistor and the fourth resistor respectively.

[0014] Furthermore, a fourth resistor is included, one end of the fourth resistor is connected to the emitter of the first transistor, and the other end of the fourth resistor is connected to the cathode of the light emitting diode.

[0015] Furthermore, the light emitting diode is an LED-red model, which can emit a red warning light when current passes through it.

[0016] Furthermore, the model of the first transistor is PNP type, and the model of the second transistor is NPN type.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model automobile amplifier undervoltage indication circuit uses few components, has low practical cost, and does not require single chip computer and software control. Composed of resistor / capacitor / voltage stabilizing diode / transistor / light emitting diode, this circuit can be well added to the power input circuit of automobile amplifier products. The product starts to work and monitors whether the input power supply voltage is low. When the power supply voltage is above 10.5VDC, the light emitting diode LED1 will not light up, indicating that the working voltage is within the normal range; when the power supply voltage is below 10.5VDC, the light emitting diode LED1 is lit and flashes regularly, prompting the user to turn off the audio system or turn down the volume when the working voltage is too low. It not only protects the amplifier product from the impact of insufficient power supply, but also avoids the continued loss of automobile system power. This circuit can be applied to all automobile amplifier products and is easy to use. The utility model has the characteristics of low cost and easy application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A circuit diagram of an automobile power amplifier undervoltage indicator light according to an embodiment of the utility model is shown;

[0020] Figure 2 This is a flow chart of the automobile power amplifier undervoltage indicator light circuit of the utility model;

[0021] The components in the accompanying drawings are marked as follows: 1 early warning module; 2 voltage stabilizing module; R1 first resistor; R2 second resistor; R3 third resistor; R4 fourth resistor; R5 fifth resistor; R6 sixth resistor; DC direct current power supply; Q1 first transistor; Q2 second transistor; C1 capacitor; LED1 light emitting diode; Z1 voltage stabilizing diode; A first transistor emitter; B first transistor base. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1 A car amplifier undervoltage indicator light circuit includes a DC power supply DC, a voltage stabilizing module 2 and an early warning module 1; both ends of the early warning module 1 are connected to the DC power supply DC, the early warning module 1 is provided with a first transistor Q1, a second transistor Q2 and a light emitting diode LED1, the emitter A of the first transistor is connected to the light emitting diode LED1, the base B of the first transistor is connected to the voltage stabilizing module 2, the collector of the first transistor Q1 is connected to the base of the second transistor Q2, the emitter of the second transistor Q2 and the anode of the light emitting diode LED1 are respectively connected to the DC power supply DC to form a series circuit.

[0024] The voltage stabilizing module 2 is provided with a voltage stabilizing diode Z1 , and the voltage of the voltage stabilizing diode Z1 is within the voltage range that can be provided by the direct current power supply DC.

[0025] Specifically, the anode of the voltage stabilizing diode Z1 is connected to the emitter A of the first transistor, and the cathode of the voltage stabilizing diode Z1 is connected to the emitter of the second transistor Q2.

[0026] A sixth resistor R6 is included, and both ends of the sixth resistor R6 are respectively connected to the cathode of the voltage stabilizing diode Z1 and the emitter of the second triode Q2. A capacitor C1 is included, and both ends of the capacitor C1 are respectively connected to the voltage stabilizing module 2 and form a parallel connection. A first resistor R1, a second resistor R2, a third resistor R3 and a fifth resistor R5 are included, and the first resistor R1, the second resistor R2, the third resistor R3 and the fifth resistor R5 are sequentially connected and form a series connection, and the first resistor R1 and the fifth resistor R5 are respectively connected to a direct current power supply DC. A fourth resistor R4 is included, and one end of the fourth resistor R4 is connected to the emitter A of the first triode, and the other end is connected to the cathode of the light emitting diode LED1.

[0027] The anode of the light emitting diode LED1 is connected to the first resistor R1, and the cathode is connected to the second transistor Q2, the third resistor R3 and the fourth resistor R4 respectively.

[0028] Specifically, the light-emitting diode LED1 is of the LED-red type, which can emit a red warning light when current passes through it. The first transistor is of the PNP type, and the second transistor is of the NPN type. The working principle of the NPN transistor is that when a voltage is applied between the emitter and the base, and between the collector and the base, holes are injected from the emitter into the base, and electrons move from the base to the collector, thereby forming a current switch; the working principle of the PNP transistor is opposite to that of the NPN. When a voltage is applied between the emitter and the base, and between the collector and the base, the holes are injected into the base, and electrons move from the base to the collector, thereby forming a current switch. When the voltage of the base B of the first transistor Q1 is not greater than the voltage of the collector A, the base B and emitter A of the first transistor Q1 are forward-biased, and voltage is applied between the emitter and the base, and between the collector and the base. After the first transistor Q1 is turned on, the current flows to the base of the second transistor Q2, and voltage is applied between the emitter and the base, and between the collector and the base of the second transistor Q2. Then, current flows through the light-emitting diode LED1 and emits a red warning light.

[0029] Embodiment: The DC power supply voltage is 5-16V, the first resistor R1 has a resistance of 220Ω, the second resistor R2 has a resistance of 1KΩ, the third resistor R3 has a resistance of 470KΩ, the fourth resistor R4 has a resistance of 300KΩ, the fifth resistor R5 has a resistance of 1MΩ, the sixth resistor R6 has a resistance of 51KΩ, the first capacitor C1 has a capacity of 1uF, the first transistor Q1 is model 4403, the second transistor Q2 is model 4401, and the voltage of the Zener diode Z1 is 7.5V;

[0030] When the DC power supply voltage is higher than 10.5VDC, the voltage charges the capacitor C1 through the resistors R1, R2, and R4. At the same time, the voltage rises to reach the emitter of the first transistor Q1 and the cathode of the Zener diode Z1. According to the characteristics of the Zener diode Z1, the emitter voltage of the first transistor Q1 is limited to 7.5V-8.5V. At this time, the voltage is divided by the resistors R1, R2, R3, and R5, so that the base voltage of the first transistor Q1 is higher than the emitter voltage, the base and the emitter are reverse biased and cut off, the second transistor Q2 has no forward bias voltage and is cut off, and the light-emitting diode LED1 has no current passing and is always in an off state. At this time, the DC power supply voltage is within the normal range.

[0031] When the DC power supply voltage is lower than 10.5VDC, the voltage charges the capacitor C1 through the resistors R1, R2, and R4, and the voltage reaches the emitter of the first transistor Q1 and the cathode of the Zener diode Z1. Because the input voltage is too low, it cannot meet the reverse conduction cutoff of the Zener diode Z1. When the voltage rises and exceeds the base voltage of the first transistor Q1 by about 0.5V, the base B and emitter A of the first transistor Q1 are forward-biased, and the voltage reaches the base of the second transistor Q2 through the collector and emitter of the first transistor Q1, making it forward-biased. The light-emitting diode LED1 is limited by the first resistor R1 and the second transistor The conduction of Q2 causes current to flow through the light-emitting diode LED1 and light up. At this time, the conduction of the second transistor Q2 causes the potential between the light-emitting diode LED1 and the fourth resistor R4 to be low, and the capacitor C1 no longer has a charging voltage. The first transistor Q1 and the second transistor Q2 begin to be turned on for discharge until the first transistor Q1 and the second transistor Q2 are turned off, and the light-emitting diode LED1 goes out. Then, the capacitor C1 is charged again through the resistors R1, R2, and R4, and is turned on again. This cycle repeats itself, and the light-emitting diode LED1 flashes regularly, prompting the user that the DC power supply voltage is too low.

[0032] The utility model automobile amplifier undervoltage indication circuit uses few components, has low practical cost, and does not require single chip computer and software control. Composed of resistor / capacitor / voltage stabilizing diode / transistor / light emitting diode, this circuit can be well added to the power input circuit of automobile amplifier products. The product starts to work and monitors whether the input power supply voltage is low. When the power supply voltage is above 10.5VDC, the light emitting diode LED1 will not light up, indicating that the working voltage is within the normal range; when the power supply voltage is below 10.5VDC, the light emitting diode LED1 is lit and flashes regularly, prompting the user to turn off the audio system or turn down the volume when the working voltage is too low. It not only protects the amplifier product from the impact of insufficient power supply, but also avoids the continued loss of automobile system power. This circuit can be applied to all automobile amplifier products and is easy to use. The utility model has the characteristics of low cost and easy application.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A car amplifier undervoltage indicator light circuit, characterized in that: It includes a direct current power supply (DC), a voltage stabilization module (2) and an early warning module (1); Both ends of the early warning module (1) are connected to a direct current power supply (DC). The early warning module (1) is provided with a first triode (Q1), a second triode (Q2) and a light-emitting diode (LED1). The emitter (A) of the first triode is connected to the light-emitting diode (LED1), the base (B) of the first triode is connected to the voltage stabilizing module (2), the collector of the first triode (Q1) is connected to the base of the second triode (Q2), and the emitter of the second triode (Q2) and the anode of the light-emitting diode (LED1) are respectively connected to the direct current power supply (DC) to form a series circuit.

2. The automobile power amplifier undervoltage indicator light circuit according to claim 1, characterized in that: The voltage stabilizing module (2) is provided with a voltage stabilizing diode (Z1), and the voltage of the voltage stabilizing diode (Z1) is within the range of voltage that can be provided by a direct current power supply (DC).

3. The automobile power amplifier undervoltage indicator light circuit according to claim 2, characterized in that: The anode of the voltage stabilizing diode (Z1) is connected to the emitter of the first transistor (A), and the cathode of the voltage stabilizing diode (Z1) is connected to the emitter of the second transistor (Q2).

4. The automobile power amplifier undervoltage indicator light circuit according to claim 3 is characterized in that: It comprises a sixth resistor (R6), the two ends of which are respectively connected to the cathode of the voltage stabilizing diode (Z1) and the emitter of the second triode (Q2).

5. The automobile power amplifier undervoltage indicator light circuit according to any one of claims 2, 3 or 4, characterized in that: It comprises a capacitor (C1), wherein two ends of the capacitor (C1) are respectively connected to a voltage stabilizing module (2) to form a parallel connection.

6. The automobile power amplifier undervoltage indicator light circuit according to claim 1, characterized in that: The invention comprises a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fifth resistor (R5), wherein the first resistor (R1), the second resistor (R2), the third resistor (R3) and the fifth resistor (R5) are connected in sequence to form a series connection, and the first resistor (R1) and the fifth resistor (R5) are respectively connected to a direct current power supply (DC).

7. The automobile power amplifier undervoltage indicator light circuit according to claim 6, characterized in that: The anode of the light emitting diode (LED1) is connected to the first resistor (R1), and the cathode is respectively connected to the second triode (Q2), the third resistor (R3) and the fourth resistor (R4).

8. The automobile power amplifier undervoltage indicator light circuit according to claim 1, characterized in that: It comprises a fourth resistor (R4), one end of which is connected to the emitter (A) of the first transistor, and the other end of which is connected to the cathode of the light emitting diode (LED1).

9. The automobile power amplifier undervoltage indicator light circuit according to claim 1, characterized in that: The light emitting diode (LED1) is an LED-red model, which can emit a red warning light when current passes through it.

10. The automobile power amplifier undervoltage indicator light circuit according to claim 1, characterized in that: The model of the first transistor (Q1) is PNP type, and the model of the second transistor (Q2) is NPN type.