Electronic horn and control system and power output circuit thereof

Abstract

The utility model discloses an electronic horn and a control system and a power output circuit thereof, and belongs to the technical field of electronic horns. The power output circuit comprises an electromagnetic coil L, a field effect transistor Q1, a field effect transistor Q2, a capacitor C, a diode D1 and a diode D2; the source electrode of the field effect transistor Q1 is electrically connected with the positive electrode of the power supply module, the drain electrode is electrically connected with one end of the electromagnetic coil L, and the grid electrode is electrically connected with the control end of the driving module; the source electrode of the field effect transistor Q2 is electrically connected with the ground, the drain electrode is electrically connected with the other end of the electromagnetic coil L, and the grid electrode is electrically connected with the control end of the driving module; the cathode of the diode D1 is electrically connected with one end of the electromagnetic coil L, and the anode is electrically connected with the ground; the anode of the diode D2 is electrically connected with the other end of the electromagnetic coil L, and the cathode is electrically connected with the anode of the power supply module; the negative electrode and the positive electrode of the capacitor C are electrically connected with the positive electrode of the diode D1 and the negative electrode of the diode D2 respectively.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic speakers, and particularly relates to an electronic speaker and its control system and power output circuit, which can be specifically used for 138 and 238 electronic speaker chips, etc. Background Art

[0002] A car has multiple electronic horns, used for honking and alarming, etc. Each horn has a control circuit. For example, patent application number CN201922191588.4 discloses a control circuit for an electronic horn with honking and alarming functions, comprising: a power output circuit, which includes a transistor switch connected to the horn's electromagnetic coil to control its power on and off; a signal mixing circuit, which includes: a switching circuit; an alarm signal input terminal, which is connected to the switching circuit; a square wave signal input terminal, which is connected to the switching circuit; and a switching signal output terminal, one end of which is connected to the switching circuit and the other end is connected to the transistor switch; and a controller, which is connected to the square wave signal input terminal to generate a square wave signal to control the horn to honk. That is, in the prior art, the switching of the electromagnetic coil is controlled by a transistor.

[0003] The applicant discovered the following problems when using the existing electronic horn:

[0004] (1) After the power is turned off, the energy of the electromagnetic coil will not disappear immediately, but will be lost in the circuit, generating heat, causing the electronic speaker to heat up;

[0005] (2) After power is cut off, the electromagnetic coil will generate a high reverse electromotive force, which may damage the transistor. Summary of the Invention

[0006] To address the aforementioned issues, the present invention provides an electronic speaker, its control system, and power output circuit. When power is off, both field-effect transistors are disconnected simultaneously, allowing capacitor C to recover energy from electromagnetic coil L. This not only reduces energy consumption, but also reduces heat generation and avoids the generation of high reverse electromotive force. The technical solution is as follows:

[0007] On the one hand, an embodiment of the present invention provides a power output circuit for an electronic speaker, including an electromagnetic coil L, a field-effect transistor, a capacitor C, a diode D1 and a diode D2, wherein the number of the field-effect transistors is two, namely field-effect transistor Q1 and field-effect transistor Q2; the source of the field-effect transistor Q1 is electrically connected to the positive electrode of the power supply module, the drain of the field-effect transistor Q1 is electrically connected to one end of the electromagnetic coil L, and the gate of the field-effect transistor Q2 is electrically connected to the control end of the drive module; the source of the field-effect transistor Q2 is electrically connected to the ground, the drain of the field-effect transistor Q2 is electrically connected to the other end of the electromagnetic coil L, and the gate of the field-effect transistor Q2 is electrically connected to the control end of the drive module; the cathode of the diode D1 is electrically connected to one end of the electromagnetic coil L, and the anode of the diode D1 is electrically connected to the ground; the anode of the diode D2 is electrically connected to the other end of the electromagnetic coil L, and the cathode of the diode D2 is electrically connected to the positive electrode of the power supply module; the cathode and anode of the capacitor C are electrically connected to the anode of the diode D1 and the cathode of the diode D2, respectively.

[0008] Specifically, the model of the field effect transistor Q1 and the field effect transistor Q2 in the embodiment of the present utility model is WSD4023DN56.

[0009] The capacitor C in the embodiment of the present invention is an electrolytic capacitor.

[0010] Specifically, the capacitance of the capacitor C in the embodiment of the present invention is 100-500 μF.

[0011] Furthermore, the power output circuit in the embodiment of the present invention also includes a current sampling unit, which includes a resistor R1 and an amplifier. The resistor R1 is connected in series between the source of the field effect transistor Q2 and the ground; the two input ends of the amplifier are respectively electrically connected to the two ends of the resistor R1, and its output end is electrically connected to the control module.

[0012] Furthermore, the power output circuit in the embodiment of the present invention also includes a voltage sampling unit, which includes a resistor R2 and a resistor R3; one end of the resistor R2 is electrically connected to the source level of the field effect transistor Q1, and the other end thereof is electrically connected to one end of the resistor R3 and the control module; the other end of the resistor R3 is electrically connected to the ground.

[0013] On the other hand, an embodiment of the present invention also provides a control system for an electronic horn, including a power supply module, a step-down module, a drive module, a control module and the aforementioned power output circuit; the input end of the step-down module is electrically connected to the power supply module, and its output end is electrically connected to the drive module and the control module; the drive module is electrically connected to the control module; and the power output circuit is electrically connected to the control module, the drive module and the power supply module.

[0014] Specifically, the power module in the embodiment of the present invention includes an ASC33CA surge suppressor chip, the step-down module includes an L78M05 linear regulator chip, and the control module includes an STC8G1K08A single-chip microcomputer.

[0015] On the other hand, an embodiment of the present invention further provides an electronic speaker, including an iron core, a shell, a resonance cover and the aforementioned control system.

[0016] The technical solution provided by the embodiment of the present invention has the following beneficial effects: The embodiment of the present invention provides an electronic speaker, its control system, and power output circuit. When the power is off, the two field-effect transistors are disconnected simultaneously, allowing the capacitor C to recover the energy of the electromagnetic coil L. This not only reduces energy consumption (the capacitor can provide some energy during operation), but also reduces heat generation and avoids the generation of high reverse electromotive force. In summary, the service life of electronic components can be extended. The current sampling unit and the voltage sampling unit can monitor the current and voltage in real time, realize closed-loop control, and control the on-off duty cycle of the field-effect transistor in real time to achieve the effect of stabilizing the sound pressure level of the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit diagram of a power output circuit of an electronic speaker provided by an embodiment of the present utility model;

[0018] Figure 2 This is a principle block diagram of the control system of the electronic speaker provided by the embodiment of the utility model;

[0019] Figure 3 This is the test result chart of RF radiated emission-ALSE method in 30-200MHz;

[0020] Figure 4 This is the test result diagram of the power amplifier output using the large current injection method;

[0021] Figure 5 This is the test result diagram of the signal source output of the large current injection method. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] See also Figure 1Embodiment 1 provides a power output circuit for an electronic speaker, comprising an electromagnetic coil L, a field-effect transistor Q1, a field-effect transistor Q2, a capacitor C, a diode D1, and a diode D2. The source of field-effect transistor Q1 is electrically connected to the positive terminal of a power module (outputting a 12V or 24V voltage), its drain is electrically connected to one end of the electromagnetic coil L, and its gate is electrically connected to the control terminal of a driver module. The source of field-effect transistor Q2 is electrically connected to ground, its drain is electrically connected to the other end of the electromagnetic coil L, and its gate is electrically connected to the control terminal of the driver module. The gates of field-effect transistors Q1 and Q2 are electrically connected to the same control terminal of the driver module, enabling simultaneous on / off switching. The cathode of diode D1 is electrically connected to one end of the electromagnetic coil L, and its anode is electrically connected to ground. The anode of diode D2 is electrically connected to the other end of the electromagnetic coil L, and its cathode is electrically connected to the positive terminal of the power module. The cathode and anode of capacitor C are electrically connected to the anode of diode D1 and the cathode of diode D2, respectively.

[0025] Specifically, the model of the field effect transistor Q1 and the field effect transistor Q2 in the embodiment of the present utility model is WSD4023DN56.

[0026] Specifically, the diode D1 and the diode D2 in the embodiment of the present invention are both SS54B.

[0027] The capacitor in the embodiment of the present invention is an electrolytic capacitor with a capacitance of 100-500 μF.

[0028] Example 2

[0029] See also Figure 1 Example 1 provides a power output circuit for an electronic speaker. Its structure is substantially the same as that of Example 1, except that the power output circuit of the electronic speaker in this embodiment further includes a current sampling unit (for detecting current and feeding it back to a control module) and a voltage sampling unit (for detecting voltage and feeding it back to the control module). The current sampling unit includes a resistor R1 and an amplifier, among others. Resistor R1 is connected in series between the source of field-effect transistor Q2 and ground. The two input terminals of the amplifier are electrically connected to the two terminals of resistor R1, respectively, and its output terminal is electrically connected to the control module (specifically, the current sampling port). The voltage sampling unit includes a resistor R2 and a resistor R3. One end of resistor R2 is electrically connected to the source of field-effect transistor Q1, and the other end is electrically connected to one end of resistor R3 and the control module (specifically, the voltage sampling port). The other end of resistor R3 is electrically connected to ground.

[0030] Example 3

[0031] See also Figure 2Example 3 provides a control system for an electronic horn, which includes a power supply module, a step-down module, a drive module, a control module, and the power output circuit disclosed in Example 2. The power supply module is used to stabilize and output a 12V or 24V voltage, and the step-down module is used to reduce the 12V or 24V voltage to 5V to power some components. The drive module is used to control the field effect transistor Q1 and the field effect transistor Q2 to achieve logic conversion, drive voltage limiting, etc. The control module is used to control the entire system, and specifically a single-chip microcomputer can be used. The input end of the step-down module is electrically connected to the power supply module, and the output end thereof is electrically connected to the drive module and the control module. The drive module is electrically connected to the control module. The power output circuit is electrically connected to the control module (for obtaining current and voltage), the drive module (for controlling the on and off of the field effect transistor Q1 and the field effect transistor Q2), and the power supply module (for powering the electromagnetic coil L).

[0032] Specifically, the power module in this embodiment includes an ASC33CA surge suppressor (TVS) chip and an SS36B diode. The high-power TVS absorbs surge pulses, while the diode provides reverse polarity protection. The step-down module includes an L78M05 linear regulator chip. The control module includes an STC8G1K08A microcontroller. The driver module includes a triode. All of the above circuits are conventional.

[0033] Example 4

[0034] Example 4 provides an electronic horn. This embodiment is a snail-shaped electric horn for use in vehicles, specifically suitable for 138 and 238 electronic horn chips. It includes an iron core, a housing, a resonance cover, and the control system disclosed in Example 3. The configuration is consistent with conventional technology, and for details, please refer to the descriptions of application numbers CN87214386, CN94211484.1, or CN202120624641.X.

[0035] The electronic speaker of this embodiment is tested as follows:

[0036] Inspection basis: Q / ZK JS557-202103 "Technical Conditions for Supply of Automobile Horns".

[0037] Detection methods: RF radiation emission-ALSE method and large current injection method.

[0038] The results of the RF radiated emission - ALSE method (test conditions: 30-200 MHz, horizontal antenna polarization, instrument bandwidth 120 kHz, linear step size 50 kHz, dwell time 5 ms; temperature 24.3°C, relative humidity 45%) (only one of them is shown) are as follows Figure 3 shown.

[0039] The results of the high current injection method (test conditions: experimental frequency 200-400MHz, injection current 75mA, modulation mode CW, AM 80%, linear step size 1MHz, dwell time 2s; temperature 24.2℃, relative humidity 44%) (only two of them are shown) are as follows Figure 4 and 5 shown.

[0040] from Figure 3-5 It can be seen that the electronic speaker of this patent meets the requirements.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power output circuit for an electronic speaker, comprising an electromagnetic coil L and a field effect transistor; characterized in that: It also includes a capacitor C, a diode D1 and a diode D2. There are two field-effect transistors, namely a field-effect transistor Q1 and a field-effect transistor Q2. The source of the field-effect transistor Q1 is electrically connected to the positive electrode of the power supply module, the drain of the field-effect transistor Q1 is electrically connected to one end of the electromagnetic coil L, and the gate of the field-effect transistor Q2 is electrically connected to the control end of the drive module. The source of the field-effect transistor Q2 is electrically connected to the ground, the drain of the field-effect transistor Q2 is electrically connected to the other end of the electromagnetic coil L, and the gate of the field-effect transistor Q2 is electrically connected to the control end of the drive module. The cathode of the diode D1 is electrically connected to one end of the electromagnetic coil L, and the anode of the diode D1 is electrically connected to the ground. The anode of the diode D2 is electrically connected to the other end of the electromagnetic coil L, and the cathode of the diode D2 is electrically connected to the positive electrode of the power supply module. The cathode and anode of the capacitor C are electrically connected to the anode of the diode D1 and the cathode of the diode D2, respectively.

2. The power output circuit according to claim 1, wherein: The models of the field effect transistor Q1 and the field effect transistor Q2 are WSD4023DN56.

3. The power output circuit according to claim 1, wherein: The capacitor C is an electrolytic capacitor.

4. The power output circuit according to claim 1, wherein: The capacitance of the capacitor C is 100-500 μF.

5. The power output circuit according to claim 1, wherein: The power output circuit also includes a current sampling unit, which includes a resistor R1 and an amplifier. The resistor R1 is connected in series between the source of the field effect transistor Q2 and the ground; the two input ends of the amplifier are respectively electrically connected to the two ends of the resistor R1, and the output end is electrically connected to the control module.

6. The power output circuit according to claim 5, characterized in that: The power output circuit also includes a voltage sampling unit, which includes a resistor R2 and a resistor R3; one end of the resistor R2 is electrically connected to the source of the field effect transistor Q1, and the other end thereof is electrically connected to one end of the resistor R3 and the control module; the other end of the resistor R3 is electrically connected to the ground.

7. A control system for an electronic horn, comprising a power module, a step-down module, a drive module, and a control module; the input end of the step-down module is electrically connected to the power module, and the output end thereof is electrically connected to the drive module and the control module; the drive module is electrically connected to the control module; characterized in that: It also includes the power output circuit as claimed in claim 6, wherein the power output circuit is electrically connected to the control module, the drive module and the power supply module.

8. The control system according to claim 7, characterized in that: The power supply module includes an ASC33CA surge suppressor chip, the voltage reduction module includes an L78M05 linear voltage regulator chip, and the control module includes an STC8G1K08A single-chip microcomputer.

9. An electronic speaker comprising an iron core, a housing and a resonance cover, characterized in that: Also included is the control system of claim 7.

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