Electric horn and control method for absorbing induced electromotive force of inductance coil with diode

Abstract

An electric horn and a control method for absorbing the induced electromotive force of an inductance coil with a diode. Using a traditional capacitor to absorb the induced electromotive force has a high drain voltage, high cost, and low reliability. The composition of the present invention includes: a terminal, the terminal (6) is fixedly connected to the coil bobbin (4) through the housing (5), the terminal is connected to the wire harness of the vehicle body, the housing is fixedly connected to the diaphragm (3) through the gland (2), a plastic shell (1) is installed on the gland, a circuit board is installed on the coil bobbin, the circuit board includes a power circuit (8) and a control circuit (7), the power circuit is electrically connected to the control circuit, the power circuit is composed of a switch (11), an inductance coil (10), and a diode (9), the diode is connected in parallel with the inductance coil, the upper end of the inductance coil is connected to Vcc, the lower end of the inductance coil is connected to the switch, and the negative electrode of the diode is connected to the upper end of the inductance coil. The present invention is used for an electric horn and a control method for absorbing the induced electromotive force of an inductance coil with a diode.

Description

Technical Field:

[0002] The present invention relates to an electric horn, and more particularly to an electric horn and a control method using a diode to absorb the induced electromotive force of an inductive coil. Background Art:

[0004] Horns are installed on automobiles to warn pedestrians and other vehicles to attract attention and ensure driving safety. Horns are classified into two categories: air horns and electric horns according to different sound - generating powers. Traditional capacitors are used in electric horns to absorb the induced electromotive force, resulting in a relatively high drain voltage, high cost, and low reliability. Summary of the Invention:

[0006] The object of the present invention is to solve the problems of high drain voltage, high cost, and low reliability caused by using traditional capacitors to absorb the induced electromotive force, and to provide an electric horn and a control method using a diode to absorb the induced electromotive force of an inductive coil, which have a long service life, good reliability, and low cost.

[0007] The above object is achieved by the following technical solutions:

[0008] An electric horn using a diode to absorb the induced electromotive force of an inductive coil, which comprises: a terminal, the terminal is fixedly connected to the coil skeleton through a housing, the terminal is connected to the vehicle wiring harness, the housing is fixedly connected to the diaphragm through a gland, a plastic shell is installed on the gland, a circuit board is installed on the coil skeleton, the circuit board includes a power circuit and a control circuit, the power circuit is electrically connected to the control circuit, the power circuit is composed of a switch, an inductive coil, and a diode, the diode is connected in parallel with the inductive coil, the upper end of the inductive coil is connected to Vcc, the lower end of the inductive coil is connected to the switch, and the negative electrode of the diode is connected to the upper end of the inductive coil.

[0009] For the electric horn using a diode to absorb the induced electromotive force of an inductive coil, the control circuit includes a 555 chip, resistor A, resistor B, and a capacitor. The Vo pin on the 555 chip is connected to the switch. The Vcc terminal of the power circuit is respectively connected to resistor A, the Vcc pin on the 555 chip, and the R pin on the 555 chip. Resistor A is respectively connected to resistor B, the DIS pin on the 555 chip. Resistor B is respectively connected to the TR pin on the 555 chip, the THR pin on the 555 chip, and one end of the capacitor. The other end of the capacitor, the GND pin on the 555 chip, and the switch are respectively grounded.

[0010] A control method for an electric horn that uses a diode to absorb the induced electromotive force of an inductor coil. The method includes the following steps: After power-on, the 555 chip generates a square-wave drive signal with a fixed frequency to control the on / off of the switch. When it is on, current flows through the inductor coil, attracting the diaphragm. When it is off, no current flows through the inductor coil, and the diaphragm is released. After reciprocating vibration like this, it makes a sound. At the moment when the switch is turned off, the inductor coil generates an induced electromotive force, and the diode will conduct instantaneously, clamping the induced electromotive force to a low voltage, thereby protecting the switch.

[0011] Beneficial effects:

[0012] 1. The present invention is an electric horn and its control method that uses a diode to absorb the induced electromotive force of an inductor coil. By using a diode to absorb the induced electromotive force, the diode is connected in parallel with the inductor coil. At the moment when the switch is turned off, the inductor coil generates an induced electromotive force, and the diode will conduct instantaneously, clamping the induced electromotive force to a low voltage, thereby protecting the switch.

[0013] The present invention is equipped with a plastic shell, which can amplify the sound.

[0014] 3. The present invention can improve the lifespan of the horn, reduce costs, and has good reliability at the same time.

[0015] The 555 chip of the present invention and resistors and capacitors together form an oscillation circuit to generate a signal for driving the switch.

[0016] The switch of the present invention is a FET, which has the advantages of high input resistance, low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown phenomenon, and wide safe operating area. Description of the drawings:

[0018] Attached Figure 1 is a schematic structural diagram of the present invention.

[0019] Attached Figure 2 is the circuit diagram of the present invention. Detailed implementation manners:

[0021] Example 1:

[0022] An electric horn that uses a diode to absorb the induced electromotive force of an inductive coil, comprising: a terminal 6, the terminal is fixedly connected to a coil bobbin 4 through a housing 5, the terminal is connected to the wiring harness of the vehicle body, the housing is fixedly connected to a diaphragm 3 through a gland 2, a plastic shell 1 is installed on the gland, a circuit board is installed on the coil bobbin, the circuit board includes a power circuit 8 and a control circuit 7, the power circuit is electrically connected to the control circuit, the power circuit consists of a switch 11, an inductive coil 10 and a diode 9, the diode is connected in parallel with the inductive coil, the upper end of the inductive coil is connected to Vcc, the lower end of the inductive coil is connected to the switch, and the negative electrode of the diode is connected to the upper end of the inductive coil.

[0023] Embodiment 2:

[0024] For the electric horn that uses a diode to absorb the induced electromotive force of an inductive coil according to Embodiment 1, the control circuit includes a 555 chip 15, a resistor A, part number: 12, a resistor B, part number: 13 and a capacitor 14. The Vo pin on the 555 chip is connected to the switch. The Vcc terminal of the power circuit is respectively connected to the resistor A, the Vcc pin on the 555 chip and the R pin on the 555 chip. The resistor A is respectively connected to the resistor B and the DIS pin on the 555 chip. The resistor B is respectively connected to the TR pin on the 555 chip, the THR pin on the 555 chip and one end of the capacitor. The other end of the capacitor and the GND pin on the 555 chip and the switch are respectively grounded.

[0025] Embodiment 3:

[0026] A control method for an electric horn that uses a diode to absorb the induced electromotive force of an inductive coil, the method includes the following steps: After power-on, the 555 chip generates a square wave drive signal with a fixed frequency to control the on-off of the switch. When it is turned on, current flows through the inductive coil to attract the diaphragm. When it is turned off, no current flows through the inductive coil and the diaphragm is released. After such reciprocating vibration, sound is emitted. At the moment when the switch is turned off, the inductive coil generates an induced electromotive force, and the diode will conduct instantaneously to clamp the induced electromotive force to a low voltage, thereby protecting the switch.

Claims

1. A control method for an electric horn that uses a diode to absorb the induced electromotive force of an inductive coil, characterized in that: This method includes the following steps: After power-on, the 555 chip generates a square-wave drive signal with a fixed frequency to control the on and off of the switch. When it is turned on, current flows through the inductive coil to attract the diaphragm. When it is turned off, no current flows through the inductive coil and the diaphragm is released. After such reciprocating vibration, sound is emitted. At the moment when the switch is turned off, the inductive coil generates an induced electromotive force, and the diode will conduct instantaneously to clamp the induced electromotive force to a low voltage, thereby protecting the switch; The electric horn that uses a diode to absorb the induced electromotive force of an inductive coil includes: a terminal. The terminal is fixedly connected to the coil bobbin through a housing. The terminal is connected to the vehicle wiring harness. The housing is fixedly connected to the diaphragm through a gland. A plastic shell is installed on the gland. A circuit board is installed on the coil bobbin. The circuit board includes a power circuit and a control circuit. The power circuit is electrically connected to the control circuit. The power circuit consists of a switch, an inductive coil, and a diode. The diode is connected in parallel with the inductive coil. The upper end of the inductive coil is connected to Vcc. The lower end of the inductive coil is connected to the switch. The negative electrode of the diode is connected to the upper end of the inductive coil; The control circuit includes a 555 chip, resistor A, resistor B, and a capacitor. The Vo pin on the 555 chip is connected to the switch. The Vcc terminal of the power circuit is respectively connected to resistor A, the Vcc pin on the 555 chip, and the R pin on the 555 chip. Resistor A is respectively connected to resistor B and the DIS pin on the 555 chip. Resistor B is respectively connected to the TR pin on the 555 chip, the THR pin on the 555 chip, and one end of the capacitor. The other end of the capacitor, the GND pin on the 555 chip, and the switch are respectively grounded.

Images