Electronic horn driven by constant power and implementation method thereof

Abstract

The invention relates to an electronic horn driven by constant power and an implementation method of the electronic horn. The implementation method of the electronic horn comprises the steps of detecting the current power supply voltage of the electronic horn to obtain a current power supply voltage value; calculating the pulse width of an electronic horn driving signal under the condition of the current power supply voltage according to the current power supply voltage value and a preset constant driving power value of the electronic horn, wherein the pulse width of the electronic horn driving signal under the condition of the current power supply voltage meets the condition that the electronic horn is driven by preset constant driving power; carrying out pulse width modulation on the electronic horn driving signal to enable the electronic horn driving signal to be modulated to have the pulse width under the condition of the current power supply voltage; using the electronic horn driving signal processed through pulse width modulation to drive the electronic horn to give out a sound. When the power supply voltage of the electronic horn changes, the pulse width of the electronic horn driving signal is automatically changed through calculation, it is ensured that the electronic horn accurately works with the rated power, the problem that the sound pressure level of the electronic horn is influenced by the power supply voltage is solved, and the defects that horn noise is caused by horn bonding, and the service life is shortened are overcome.

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

Images