Regulator W end design circuit adaptive to 4V constant electric instrument panel

Abstract

The utility model discloses a regulator W terminal design circuit adapted to a 4V constant electric instrument panel, which comprises an HS-P terminal, an HS-W terminal and an HS-L terminal, the HS-P terminal is connected with one end of a resistor R34, one end of a resistor R35 and one end of a resettable fuse L2, the resistor R34, the resistor R35 and the resettable fuse L2 are connected in parallel, and the other end of the resettable fuse L2 is connected with the HS-W terminal. The other end of the resistor R34, the other end of the resistor R35 and the other end of the resettable fuse L2 are connected with a resistor R31 and a capacitor C27 and are connected to an HS-W terminal, discrete electronic materials are used for designing circuits, different instrument panel circuits can be matched, portability is high, and application is flexible. The circuit design is ingenious, the situation that a P-end phase signal is pulled down all the time when an automobile is started and stopped is avoided, and the problems that an instrument panel is mistakenly recognized and a pointer swings disorderly due to sudden speed change of a generator in the driving process of the automobile are solved. The development period is shortened, the development cost is reduced, and the market competitiveness is improved.

Description

Technical Field

[0001] This utility model relates to the field of regulator technology, specifically to a regulator W-terminal design circuit adapted to a 4V constant voltage instrument panel. Background Technology

[0002] A car's dashboard display reflects the operating status of various vehicle systems. It primarily includes the engine's current RPM, vehicle speed, electronic throttle indicator, fuel indicator, front and rear fog light indicators, and warning lights, allowing for real-time monitoring of the vehicle's current condition. Currently, many dashboards on the market are equipped with a constant 4V-5V power supply. This can cause the dashboard to display abnormal RPM readings (the regulator's W-end provides the RPM signal) when the vehicle's RPM changes drastically, leading to misjudgments and potentially vehicle malfunctions. Therefore, it is necessary to choose a suitable alternator regulator compatible with this specific dashboard design.

[0003] The existing controller W-end design has the following disadvantages:

[0004] The regulator's W terminal is directly connected to the phase signal P terminal. When the vehicle starts, when the speed is cut off, or when the vehicle speed changes drastically during driving, the P terminal signal will generate irregular frequency changes. At this time, the W terminal signal will also change accordingly. When the feedback is sent to the instrument panel, the instrument panel recognizes the abnormal speed pointer deflection, which swings between 0-3000 rpm.

[0005] Using common transistors, MOSFETs and other components to design a simple push-pull circuit, it cannot completely avoid the instrument panel pointer misreading under the condition of rapid acceleration of the regulator, and it cannot meet the regulator's requirement of 200mA output drive current.

[0006] Using a dedicated half-bridge driver chip to design a complex push-pull circuit can avoid the above problems, but the electronic components are expensive and the circuit design is complex, which brings difficulties and challenges to layout engineers, and is prone to EMC interference issues.

[0007] When the vehicle's engine speed changes drastically, the instrument panel's speed reading becomes abnormal (the regulator's W terminal provides the speed signal). When the generator output is too high, the regulator enters a phase voltage regulation process. During this process, the phase voltage, i.e., the W terminal signal, narrows to 0-18V (regulator characteristic). However, actual test data shows that the W terminal signal narrows from 0-28V to approximately 5-18V. The vehicle's instrument panel's speed judgment logic is based on a 1.5-3.5V trigger count (therefore, during the narrowing process, there will be abnormal speed counting and periods without counting). Ultimately, this causes the faulty vehicle's instrument panel speed to oscillate between 3000 and 0 when abnormal speed occurs.

[0008] The instrument panel has a constant 4V common power supply terminal W, which is present upon power-on. This constant power signal of the instrument panel will affect the phase signal output voltage of the generator terminal W. When the simulated generator on the generator test bench enters phase voltage regulation, the low voltage of the generator phase voltage will narrow to above 1.5V, triggering an abnormal recognition of the instrument panel. When the generator speed changes drastically, the phase voltage is generated by the coil cutting residual magnetism when the generator regulator enters phase voltage regulation, and the diode does not conduct to ground. This results in the low voltage at this time being the 4V voltage provided by the instrument panel. The instrument panel recognizes the speed signal as 1.5 to 3.5V. Therefore, when the regulator adjusts the phase voltage, the instrument panel may fail to recognize the speed or recognize two or three times the actual speed, resulting in abnormal deflection of the vehicle instrument panel (oscillating between 0-3000rpm).

[0009] Therefore, a regulator W-terminal circuit design adapted to a 4V constant voltage instrument panel is proposed. Summary of the Invention

[0010] The purpose of this invention is to provide a regulator W-terminal design circuit that is compatible with a 4V constant voltage instrument panel, so as to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a regulator W-terminal design circuit adapted to a 4V constant power instrument panel, including an HS-P terminal, an HS-W terminal, and an HS-L terminal. A resistor R34, a resistor R35, and a resettable fuse L2 are connected to one end of the HS-P terminal. The resistors R34, R35, and the resettable fuse L2 are connected in parallel. The other end of the resistors R34, R35, and the resettable fuse L2 is connected to a resistor R31 and a capacitor C27, and is connected to the HS-W terminal.

[0012] The other end of the resistor R31 is connected to the collector of the transistor Q7, and the base of the transistor Q7 is connected to the resistor R32 and the HS-L terminal.

[0013] Preferably, a voltage divider resistor R33 is also connected between the emitter and base of the transistor Q7.

[0014] Preferably, the emitter of the transistor Q7 is grounded, and the other end of the capacitor C27 is grounded.

[0015] Preferably, the HS-P terminal is connected to the phase signal output terminal of the generator.

[0016] Preferably, the HS-W terminal will feed back the real-time status of the generator to the instrument panel.

[0017] Compared with existing technologies, the advantages of this invention are: It uses discrete electronic components to design the circuit, allowing it to be compatible with different dashboard circuits, offering strong portability and flexible application. The ingenious circuit design avoids the situation where the P-phase signal is continuously pulled low when the car starts and stops, and also solves the problem of dashboard misidentification and pointer erratic swings caused by rapid alternator speed changes during vehicle operation. It shortens the development cycle, reduces development costs, and enhances market competitiveness. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the circuit principle of this utility model. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] Please see Figure 1 This utility model provides a technical solution: a circuit design for the W terminal of a regulator adapted to a 4V constant power instrument panel, including an HS-P terminal, an HS-W terminal, and an HS-L terminal. The HS-P terminal is externally connected to the phase signal output terminal of the generator, and internally connected to one end of resistor R34, resistor R35, and resettable fuse L2. The three components, resistor R34, resistor R35, and resettable fuse L2, are connected in parallel.

[0021] The other end is connected to one end of resistor R31, one end of capacitor C27, and also to the HS-W terminal, i.e., the W terminal of the bracket. This terminal will feed back the real-time status of the generator to the instrument panel. The other end of resistor R31 is connected to the collector of transistor Q7. The base of Q7 is connected to the HS-L terminal and the Lamp terminal of the regulator through resistor R32, and also connected to the emitter through voltage divider resistor R33. The emitter of transistor Q7 is grounded, and the other end of C27 is connected to the ground wire.

[0022] like Figure 1As shown, when the resettable fuse L2 and the high-resistance resistor R35 are connected in parallel, the phase signal of HS-P will preferentially be transmitted to the HS-W terminal through the resettable fuse L2. When a circuit fault or other abnormal condition occurs, the load current will continuously increase. With the increase in current, other components on the circuit may be damaged, or even the circuit may burn out, causing serious consequences such as vehicle fire. However, the series connection design of the resettable fuse L2 provides a safe protection function. The resettable fuse will generate an impedance change when an abnormal current occurs. When the current rises to a certain level, the resettable fuse L2 will automatically melt and cut off the current, thus providing protection. When the abnormality disappears, the fuse will return to normal operation. The advantage of this design is that it can accurately transmit the generator P terminal signal to the W terminal, while also meeting the output of the drive current to drive the external load device at the W terminal.

[0023] Because the instrument has a constant 4V power supply to the W terminal, which is present upon power-on, this constant power signal will affect the generator's W terminal phase signal output voltage. When the generator enters phase voltage regulation, the low voltage of the generator phase voltage will narrow to above 1.5V, triggering an instrument recognition anomaly. Based on the design of this utility model, when the generator enters the phase voltage regulation stage, the L terminal light goes out, HS-L is at a high potential, and the voltage is divided by voltage divider resistors R32 and R33 to reach the turn-on condition of transistor Q7. Q7 conducts, R31 is grounded, and at this time, the pull-down resistor plays its role, pulling down the HS-P phase signal after passing through the fuse to below 1.5V. At this time, the instrument recognition anomaly disappears, and the pointer swings normally. Capacitor C27 acts as a filter and can improve the stability of the generator during conducted interference tests (CE and RE).

[0024] The ingenious design of this invention lies in the following: When the vehicle starts, the generator speed is low, the L-phase indicator light is on, and HS-L is at a low potential. Through voltage divider resistors R32 and R33, transistor Q7 cannot turn on, and the HS-W signal is consistent with HS-P. The instrument panel directly detects the generator signal and provides feedback. As the generator speed increases, the regulator voltage rises, the pre-excitation state exit indicator light goes out, and HS-L reaches a high potential. The voltage, after being divided by voltage divider resistors R32 and R33, reaches the turn-on condition for transistor Q7, causing Q7 to conduct. R31 is grounded, and the pull-down resistor then pulls the HS-P phase signal (after passing through the fuse) down to below 1.5V. At this point, the instrument panel recognition anomaly disappears, and the pointer swings normally. This avoids the situation where the P-phase signal is constantly pulled low during vehicle start-up and stopping, and also solves the problem of misrecognition and chaotic pointer swings on the instrument panel caused by rapid generator speed changes during vehicle operation.

[0025] 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. A regulator W-terminal design circuit for a 4V constant-voltage instrument panel, comprising an HS-P terminal, an HS-W terminal, and an HS-L terminal, characterized in that: The HS-P terminal is connected to one end of resistors R34 and R35 and resettable fuse L2. Resistors R34, R35 and resettable fuse L2 are connected in parallel. The other end of resistors R34, R35 and resettable fuse L2 is connected to resistor R31 and capacitor C27 and connected to the HS-W terminal. The other end of the resistor R31 is connected to the collector of the transistor Q7, and the base of the transistor Q7 is connected to the resistor R32 and the HS-L terminal.

2. The regulator W-terminal design circuit for a 4V constant voltage instrument panel according to claim 1, characterized in that: A voltage divider resistor R33 is also connected between the emitter and base of the transistor Q7.

3. The regulator W-terminal design circuit for a 4V constant voltage instrument panel according to claim 1, characterized in that: The emitter of the transistor Q7 is grounded, and the other end of the capacitor C27 is grounded.

4. The regulator W-terminal design circuit for a 4V constant voltage instrument panel according to claim 1, characterized in that: The HS-P terminal is connected to the phase signal output terminal of the generator.

5. The regulator W-terminal design circuit for a 4V constant voltage instrument panel according to claim 1, characterized in that: The HS-W terminal will feed back the generator's real-time status to the instrument panel.

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