CN218449478U

CN218449478U - XLR microphone protection circuit

Info

Publication number: CN218449478U
Application number: CN202222369073.0U
Authority: CN
Inventors: 杨志豪; 陈晴; 杨坤
Original assignee: Guangdong Takstar Electronic Co ltd
Current assignee: Guangdong Takstar Electronic Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-02-03
Anticipated expiration: 2032-09-06

Abstract

The utility model relates to a protection circuit's technical field, more specifically relates to a XLR microphone protection circuit. The power supply comprises a boosting module, a switch module, a control module and a mechanical switch. The switch module comprises a first field effect transistor, a second field effect transistor, a third field effect transistor and a first resistor, wherein the source electrode of the first field effect transistor is connected with the output end of the boosting module, the drain electrode of the first field effect transistor is connected with the input end of the rear-stage circuit, and the grid electrode of the first field effect transistor is connected with the source electrode of the rear-stage circuit; the drain electrode of the second field effect transistor is connected with the grid electrode of the first field effect transistor, the grid electrode is connected with the first high-level voltage output end of the control module, and the source electrode is grounded; the drain electrode of the third field effect transistor is connected with the drain electrode of the first field effect transistor, the grid electrode of the third field effect transistor is connected with the second high-level voltage output end of the control module, and the source electrode of the third field effect transistor is grounded. The utility model discloses mainly delay letting in or the disconnection of power through control chip to make MOS pipe delay charging and discharging, can solve the problem of the damage that the power caused XLR microphone in the twinkling of an eye is connected with the XLR microphone.

Description

XLR microphone protection circuit

Technical Field

The utility model relates to a protection circuit's technical field, more specifically relates to a XLR microphone protection circuit.

Background

In daily life, it is highly likely that an electric spark will occur when a plug of a microphone is plugged into a power supply, or that a POPO sound generated by an arc and a howling from the microphone can be heard remarkably, every time the plug of the microphone is plugged into the power supply. The phenomenon is more obvious in larger electric appliances, because a larger voltage difference exists between the electric appliances and a power supply, the contact area of an electric appliance plug is smaller at the beginning, when the electric appliance plug is closely connected with a power socket, the voltage difference can cause air to be punctured to generate electric arcs, the power supply directly impacts the electric appliances, the phenomenon only damages metal on the surface of the plug when slight, and the electric appliances or the socket can be burnt when serious.

In the prior art, XLR power control circuits are various, but all are powered directly by chips, and some control switches are rarely used to protect the circuits, and a battery is also arranged in an electrical appliance to reduce the voltage difference between the power supply and the electrical appliance, so that the generation of electric arcs is reduced, but the generation of electric arcs cannot be completely eliminated, and a microphone is easily damaged to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome among the above-mentioned background art the problem that the power direct access microphone caused the microphone to damage provides a XLR microphone protection circuit.

In order to solve the technical problem, the technical scheme of the utility model as follows:

an XLR microphone protection circuit is connected between a power supply and a rear-stage circuit, and comprises a boosting module, a switch module, a control module and a mechanical switch;

the power supply is respectively connected with the input end of the boosting module and the input end of the control module in a power supply mode; the switch module comprises a first field effect transistor, a second field effect transistor, a third field effect transistor and a first resistor, wherein the source electrode of the first field effect transistor is connected with the output end of the boosting module, the drain electrode of the first field effect transistor is connected with the input end of the post-stage circuit, and the grid electrode of the first field effect transistor is connected with the source electrode of the post-stage circuit; the drain electrode of the second field effect transistor is connected with the grid electrode of the first field effect transistor, the grid electrode is connected with the first high-level voltage output end of the control module, and the source electrode is grounded; the drain electrode of the third field effect transistor is connected with the drain electrode of the first field effect transistor, the grid electrode of the third field effect transistor is connected with the second high-level voltage output end of the control module, and the source electrode of the third field effect transistor is grounded; and the control end of the control module is connected with the mechanical switch.

Preferably, the first field effect transistor is a P-channel MOS transistor, and the second field effect transistor and the third field effect transistor are both N-channel MOS transistors.

Preferably, the boost module comprises a boost chip, an input end and an enable end of the boost chip are respectively connected with the power supply, and an output end of the boost chip is connected with an input end of the switch module.

Preferably, the model of the booster chip is AX5203.

Preferably, the circuit further includes a voltage stabilizing module, an input end of the voltage stabilizing module is connected to an output end of the voltage boosting module, and an output end of the voltage stabilizing module is connected to an input end of the switch module.

Preferably, the voltage stabilizing module comprises a first triode, a second triode, a first capacitor, a second capacitor and a second resistor, wherein a collector of the first triode is connected with an output end of the boosting module, a base of the first triode is grounded through the first capacitor, and an emitter of the first triode is connected with an input end of the switching module through the second resistor; the base electrode of the second triode is connected with the emitting electrode of the first triode, the collector electrode of the second triode is connected with the base electrode of the first triode, the emitting electrode of the second triode is connected with the output end of the second resistor, and the emitting electrode of the second triode is grounded through the second capacitor.

Preferably, the circuit further comprises a first diode, an input end of the first diode is connected with an output end of the boosting module, and an output end of the first diode is connected with a collector of the first triode.

Preferably, the first triode, the second triode and the third triode are all of NPN type.

Preferably, the control module includes a control chip, an input end of the control chip is connected to the power supply, a first high-level voltage output end is connected to a gate of the second field effect transistor, a second high-level voltage output end is connected to a gate of the third field effect transistor, and a control end is connected to the mechanical switch.

Preferably, the type of the control chip is WB32F103K8U6.

The beneficial effects are that:

1. the utility model discloses a control the on-state of a plurality of MOS pipes step by step and eliminate the power and connect in the twinkling of an eye or turn-off the phenomenon that produces arc discharge. The voltage is gradually increased to the rated voltage after being conducted only by adopting a plurality of resistors to divide the voltage among the MOS tubes, or the voltage is slowly discharged when being disconnected, so that the arc phenomenon generated by instantaneous power on and power off is eliminated.

2. The utility model discloses a control chip delays letting in or the disconnection of power. The conduction state between the XLR microphone and the power supply can be changed only by pressing down the mechanical switch; the software is adopted to control the low voltage of the power supply to be slowly boosted, so that the MOS tube delays charging and discharging, and the problem of damage to the XLR microphone at the moment of connection between the power supply and the XLR microphone can be solved.

Drawings

Fig. 1 is a block diagram of a first embodiment of the present invention.

Fig. 2 is a circuit structure diagram of the first embodiment of the present invention.

Fig. 3 is a circuit structure diagram of a second embodiment of the present invention.

Fig. 4 is a circuit diagram of a control module according to a third embodiment of the present invention.

Wherein: the power supply 10, the boost module 20, the voltage regulation module 30, the switch module 40, the XLR microphone 50, the control module 60, and the mechanical switch 70.

Detailed Description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention will be combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are illustrative of some, but not all embodiments of the invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1, the present embodiment provides an XLR microphone protection circuit, which is connected between a power supply 10 and an XLR microphone 50, and includes a boosting module 20, a voltage stabilizing module 30, a switching module 40, a control module 60, and a mechanical switch 70.

Specifically, referring to fig. 2, the power supply 10 is powered by a low voltage, and an output voltage thereof is +5V, and the output voltage is respectively connected to the input terminal of the boost module 20 and the input terminal of the control module 60. The switch module 40 includes a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3 and a first resistor R1, wherein a source electrode of the first field effect transistor Q1 is connected with an output end of the boost module 20, a drain electrode is connected with an input end of the XLR microphone 50, and a gate electrode is connected with a source electrode thereof. The drain of the second fet Q2 is connected to the gate of the first fet Q1, the gate is connected to the first high-level voltage output terminal U2_48v _onof the control module 60, and the source is grounded. The drain of the third fet Q3 is connected to the drain of the first fet Q1, the gate thereof is connected to the second high-level voltage output terminal U2_48v _offof the control module 60, and the source thereof is grounded. The control terminal of the control module 60 is connected to a mechanical switch 70.

In this embodiment, the voltage regulation module 30 may be connected between the voltage boost module 20 and the switch module 40, that is, the input terminal of the voltage regulation module 30 is connected to the output terminal of the voltage boost module 20, and the output terminal is connected to the source of the first field effect transistor Q1. The first and second high-level voltage output terminals U2_48v _onand U2_48v _offof the control module 60 mainly output a voltage of + 48V.

The boosting module 20 is mainly used for boosting the low voltage output by the power supply 10, boosting the +5V voltage of the power supply 10 to +48V voltage, and providing voltage for the XLR microphone 50. The voltage stabilizing module 30 is mainly used for stabilizing the output voltage of the voltage boosting module 20, and the supply voltage of the alternating current is unstable under various conditions, so that the direct current voltage output by the rectifying and filtering circuit is also unstable; on the other hand, since the rectifying and filtering circuit inevitably has internal resistance, when the load current changes, the output voltage is also influenced and changed, and in order to stabilize the direct-current voltage, a voltage stabilizing circuit is required to be adopted after the rectifying and filtering circuit in the design. The switch module 40 mainly plays a role in controlling the on-state voltage, and realizes the effect of slow charging and discharging. The control module 60 is mainly used for controlling the switch module 40 to be turned on and controlling the switch module 40 to delay charging and discharging. The mechanical switch 70 is used to control the control module 60 to implement different commands.

In this embodiment, the first field effect transistor Q1 is a P-channel MOS transistor, and the second field effect transistor Q2 and the third field effect transistor Q3 are both N-channel MOS transistors. After the voltage of the power supply 10 is boosted by the boost module 20, the voltage is stabilized by the voltage stabilizing module 30, and the voltage of +48V is connected to the source and the gate of the first field effect transistor Q1. Therefore, the gate of the first fet Q1 is at a high voltage, and when the gate of the first fet Q1 is pulled down from the high voltage to a low voltage, the first fet Q1 is turned on. The switching module 40 is in a standby state when the gate of the first fet Q1 is at a high voltage.

Through the connection of the components, the embodiment can have two actions, namely a conducting action and a power-off action.

Conducting action: when the switch module 40 is in a standby state, the mechanical switch 70 is pressed, the first high-level voltage output terminal U2_48v _onof the control module 60 outputs +48V to the gate of the second fet Q2, and the gate voltage of the first fet Q1 is pulled down after the second fet Q2 is turned on, so that the first fet Q1 is also turned on, and the XLR microphone 50 can operate when it is powered on. When the first high-level voltage output end U2_48v _onof the control module 60 outputs a voltage of +48V, the first high-level voltage output end U2_48v _onmay be controlled by software to delay output of the high-level voltage, that is, the voltage is slowly boosted from 0V to +48V, so that the gate of the first fet Q1 is also slowly reduced from the high voltage to the low voltage, and thus the first fet Q1 is also turned on, and the voltage that the first fet Q1 is slowly turned on is also slowly boosted from 0V, thereby avoiding that the first fet Q1 instantly turns on the high voltage to cause damage to the XLR microphone 50.

Power-off action: when the first fet Q1 is in the on state, the mechanical switch 70 is pressed again, the second high level voltage output terminal U2_48v \ off of the control module 60 outputs +48V to the gate of the third fet Q3, and the drain voltage of the first fet Q1, i.e., the input voltage of the XLR microphone 50, is pulled down after the third fet Q3 is turned on, so that the XLR microphone 50 is powered off and stops working. When the second high-level voltage output terminal U2_48v _offof the control module 60 outputs a voltage of +48V, the second high-level voltage output terminal U2_48v _offcan be controlled by software to delay output of the high-level voltage, that is, the voltage is slowly boosted from 0V to +48V, so that the third fet Q3 is slowly turned on, and the characteristic of slow discharge of the first resistor R1 is matched, so that the input voltage of the XLR microphone 50 is also slowly reduced from the high voltage to the low voltage, and the XLR microphone 50 is slowly de-energized to stop working, thereby preventing damage to the XLR microphone 50 caused by an arc generated by direct power outage.

In combination with the above actions, the operation steps of this embodiment are: first, a voltage source with +5V is connected to the boost module 20 and the control module 60, and the voltage output by the boost module 20 is stabilized by the stabilizing module and is supplied to the source of the first fet Q1, i.e., the switching module 40 is in the standby state. If the XLR microphone 50 needs to work, the mechanical switch 70 is pressed, and the first high-level voltage output terminal U2_48v _onof the control module 60 slowly increases the output voltage to +48V, so as to control the second fet Q2 to slowly turn on the first fet Q1, and further slowly increase the input voltage of the XLR microphone 50, and the XLR microphone can normally work when the input voltage of the XLR microphone 50 is stable. If the XLR microphone 50 needs to be turned off, i.e. the XLR microphone 50 is not operated, the mechanical switch 70 is pressed again, the second high constant voltage output terminal of the control module 60 slowly raises the output voltage to +48V, so as to control the third fet Q3 to slowly lower the input voltage of the XLR microphone 50 from high voltage to low voltage, even to 0V, and the XLR microphone 50 is stopped. By slowly varying the input voltage to the XLR microphone 50, it is avoided that the power supply 10 directly switches the XLR microphone 50 on or off, causing irreversible damage to the XLR microphone 50.

Example two:

on the basis of the first embodiment, the present embodiment is different in that:

as shown in fig. 3, the boost module 20 of the present embodiment includes at least a boost chip U1, an input terminal U1_ VCC and an enable terminal U1_ EN of the boost chip U1 are respectively connected to the power supply 10, and an output terminal U1_ SWW is connected to an input terminal of the switch module 40. In the circuit, a plurality of resistors and a plurality of capacitors are also provided.

In the present embodiment, the model number of the booster chip U1 is AX5203. The boost chip U1 is mainly used for boosting the power supply 10 with a voltage of +5V to +48V for output. The resistor mainly plays a role in voltage division, and the capacitor mainly plays a role in filtering and voltage stabilization.

The voltage stabilizing module 30 of this embodiment includes a first triode Q4, a second triode Q5, a first capacitor C1, a second capacitor C2, and a second resistor R2, wherein the collector of the first triode Q4 is connected to the output terminal of the boost module 20, the base is grounded via the first capacitor C1, and the emitter is connected to the input terminal of the switch module 40 via the second resistor R2. The base electrode of the second triode Q5 is connected with the emitting electrode of the first triode Q4, the collector electrode of the second triode Q5 is connected with the base electrode of the first triode Q4, the emitting electrode of the second triode Q2 is connected with the output end of the second resistor R2, and the emitting electrode of the second triode Q5 is grounded through the second capacitor C2.

In the present embodiment, the first, second, and third transistors Q4, Q5, and Q6 are all of NPN type. The second resistor R2 mainly functions as a voltage divider, and the first capacitor C1 and the second capacitor C2 mainly function as a filter. After the boosting module 20 supplies +48V voltage to the first triode Q4 and the second triode Q5, the voltage is normally supplied to the switching module 40 through the second resistor R2; when the voltage at the two ends of the second resistor R2 is overlarge, the base voltage of the third triode Q6 is increased, so that the third triode Q6 is conducted, and the overlarge voltage is introduced into the ground to play a role in protection.

The embodiment further includes a first diode D1, an input end of the first diode D1 is connected to an output end of the boost module 20, and an output end of the first diode D1 is connected to a collector of the first triode Q4.

In the present embodiment, the first diode D1 is mainly used to prevent the boost chip U1 from being damaged by the reverse current.

The control module 60 of the present embodiment includes a control chip U2, an input terminal U2_ VDD of the control chip U2 is connected to the power supply 10, a first high-level voltage output terminal U2_48v _ on is connected to a gate of the second fet Q2, a second high-level voltage output terminal U2_48v _ off is connected to a gate of the third fet Q3, and a control terminal U2_ PA0-WKUP is connected to the mechanical switch 70.

In the present embodiment, the type of the control chip U2 is WB32F103K8U6. The control chip U2 mainly gives instructions through the mechanical switch 70 by software control, and controls the on-state of the second field effect transistor Q2 and the third field effect transistor Q3 by the output voltage of the terminal pin, thereby controlling the on-state of the first field effect transistor Q1.

Through the connection of the above components, the operation steps of the previous embodiment can be optimized as follows:

firstly, a voltage source with the size of +5V is connected to the boosting chip U1 and the control chip U2, the voltage output by the boosting chip U1 is stabilized through the first triode Q4 and the second triode Q5, and the voltage is supplied to the source electrode of the first field-effect tube Q1 through the second resistor R2, namely, the switch module 40 is in a standby state. If the XLR microphone 50 needs to work, the mechanical switch 70 is pressed, and the first high-level voltage output terminal U2_48v _ on of the control chip U2 slowly increases the output voltage to +48V, so that the second field-effect transistor Q2 is controlled to slowly turn on the first field-effect transistor Q1, and further the input voltage of the XLR microphone 50 is slowly increased, and the XLR microphone can normally work when the input voltage of the XLR microphone 50 is stable. If the XLR microphone 50 needs to be turned off, i.e. the XLR microphone 50 is not operated, the mechanical switch 70 is pressed again, the second high constant voltage output terminal of the control chip U2 slowly raises the output voltage to +48V, so as to control the third fet Q3 to slowly lower the input voltage of the XLR microphone 50 from high voltage to low voltage, even to 0V, and the XLR microphone 50 is stopped.

Example three:

as shown in fig. 4, the present embodiment provides a circuit diagram of the control module 60.

In this embodiment, the first high-level voltage output terminal U2_48v _onand the second high-level voltage output terminal U2_48v _offof the control module 60 are also grounded through a capacitor, respectively. The capacitor mainly plays a role of filtering.

On the control chip U2, the control terminal U2_ PA0-WKUP may further be provided with a plurality of functional keys.

While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims

1. An XLR microphone protection circuit is characterized in that the circuit is connected between a power supply and a rear-stage circuit, and comprises a boosting module, a switch module, a control module and a mechanical switch;

2. The XLR microphone protection circuit of claim 1, wherein the first FET is a P-channel MOS, and the second and third FETs are N-channel MOS.

3. The XLR microphone protection circuit of claim 1, wherein the boost module comprises a boost chip, an input terminal and an enable terminal of the boost chip are respectively connected with the power supply, and an output terminal of the boost chip is connected with an input terminal of the switch module.

4. The XLR microphone protection circuit of claim 3, wherein the model number of the boost chip is AX5203.

5. The XLR microphone protection circuit of claim 1, further comprising a voltage regulation module having an input connected to the output of the voltage boost module and an output connected to the input of the switch module.

6. The XLR microphone protection circuit of claim 5, wherein the voltage regulation module comprises a first triode, a second triode, a first capacitor, a second capacitor, and a second resistor, wherein a collector of the first triode is connected to the output terminal of the boost module, a base of the first triode is grounded through the first capacitor, and an emitter of the first triode is connected to the input terminal of the switch module through the second resistor; the base electrode of the second triode is connected with the emitting electrode of the first triode, the collector electrode of the second triode is connected with the base electrode of the first triode, the emitting electrode of the second triode is connected with the output end of the second resistor, and the emitting electrode of the second triode is grounded through the second capacitor.

7. The XLR microphone protection circuit of claim 6, further comprising a first diode having an input connected to the output of the boost module and an output connected to the collector of the first transistor.

8. The XLR microphone protection circuit of claim 6, wherein the first, second, and third transistors are all NPN type.

9. The XLR microphone protection circuit of claim 1, wherein the control module comprises a control chip, an input terminal of the control chip is connected to the power supply, a first high level voltage output terminal is connected to the gate of the second FET, a second high level voltage output terminal is connected to the gate of the third FET, and a control terminal is connected to the mechanical switch.

10. The XLR microphone protection circuit of claim 9, wherein the type of the control chip is WB32F103K8U6.