An electronic horn driven by constant power and its realization method

Abstract

The present invention relates to an electronic horn driven by constant power and its realization method. The method comprises: detecting the current power supply voltage of the electronic horn to obtain the current power supply voltage value; The power value calculates the pulse width of the electronic horn drive signal under the current supply voltage, and the pulse width of the electronic horn drive signal under the current supply voltage meets the condition of driving the electronic horn with a preset constant drive power; pulse the drive signal of the electronic horn Width modulation, modulating the driving signal to the pulse width under the current supply voltage; using the pulse width modulated driving signal to drive the electronic horn to sound. The present invention automatically changes the pulse width of the horn driving signal through calculation when the power supply voltage of the horn changes, ensures that the horn works accurately at the rated power, solves the problem that the sound pressure level of the horn is affected by the power supply voltage, and eliminates the noise of the horn and the shortened life of the horn caused by iron striking disadvantages.

Description

technical field [0001] The invention relates to the field of electronic horns for vehicles and ships, in particular to an electronic horn driven by constant power and a realization method thereof. Background technique [0002] Generally, electric horns for motor vehicles and ships, no matter they are mechanical or electronic, the driving power of the horn itself changes greatly due to the influence of the power supply voltage. For example, electric speakers are required to work at a voltage of 9-16 volts. According to the standard voltage of 13V and the operating current of 4A, the power of the speaker will vary greatly within the range of 25W-79W. This has a great impact on the sound effect of the speaker and the life of the speaker. It is very easy to cause a large attenuation of the sound level of the speaker under low voltage, and the collision between the moving iron core and the fixed iron core of the electromagnet driving the diaphragm to produce sound under high volt...

AI Technical Summary

Problems solved by technology

Although some people use constant current source driving or use analog devices to reduce the driving pulse width to reduce the current, but because of the inability to accurately control the driving power, the occurrence of such failure modes cannot be eliminated.

[0003] For example, the electric horn driven by a constant current source has a constant current of 4A. When the electric horn works at 9V, its power is 36W, at 13V, its power is 52W, and at 16V, its power is 64W. This method Although better than the common method without control, it is far from the requirement of accurate control to work with constant drive power

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