Voltage stabilizing filter for musical instrument

Abstract

The present invention relates to a voltage-stabilizing filter for a musical instrument, comprising a housing, a circuit board arranged on the inner side of the housing, and an input interface and an output interface arranged on the housing; the circuit board carries a control circuit; the control circuit comprises an anti-reverse connection circuit, a boost circuit connected to the output end of the anti-reverse connection circuit, a buck circuit connected to the output end of the boost circuit, and a filtering and step-down circuit connected to the output end of the step-down circuit; the output end of the filtering and step-down circuit is connected to the output interface. The present invention steps up the input voltage and then steps it down, and then steps it down and filters and steps it down through a filtering and step-down circuit, so that the output interface has a stable voltage and current. The present invention can effectively stabilize the output interface voltage at 9V, and the ripple value is controlled at about 6mv, so that the interference of the electronic musical instrument with the power supply is greatly reduced, and the playing effect is better.

Description

Technical Field

[0001] The present invention relates to musical equipment, and more particularly to a voltage-stabilizing filter for a musical instrument. Background Art

[0002] For guitarists, noise is the most intolerable. The cleanest power source in the world is a 9V battery with a ripple value of about 6mv.

[0003] The adapter usually has a ripple of about 200mv, and the ripple noise will be very obvious if it exceeds 80mv. However, it is difficult for the existing filter to stabilize the voltage at 9V, and the ripple value is controlled at about 6mv. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a voltage-stabilizing filter for a musical instrument.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A voltage-stabilizing filter for a musical instrument, comprising a shell, a circuit board arranged on the inner side of the shell, and an input interface and an output interface arranged on the shell; the circuit board carries a control circuit; the characteristic is that the control circuit comprises an anti-reverse connection circuit, a boost circuit connected to the output end of the anti-reverse connection circuit, a buck circuit connected to the output end of the boost circuit, and a filtering and step-down circuit connected to the output end of the step-down circuit; the output end of the filtering and step-down circuit is connected to the output interface.

[0007] Its further technical solution is: the anti-reverse connection circuit includes a MOS tube Q3, whose model is TDM3478; the drain of the MOS tube Q3 is connected to the negative pole of the power supply terminal, the gate is connected to the positive pole of the power supply terminal through a resistor R20, and the source is grounded; the gate of the MOS tube Q3 is grounded after being connected in parallel with a diode D6 and a resistor R21; the positive pole of the diode D6 is grounded.

[0008] Its further technical solution is: the boost circuit includes a boost control chip U1, whose model is XR4981; the terminal pin VISP of the boost control chip U1 is connected to the output end of the anti-reverse connection circuit, and the terminal pins VISN and AVIN are connected in parallel with the output end of the anti-reverse connection circuit through resistors R1 and R2; the terminal pin SW of the boost control chip U1 is connected to the output end; the terminal pin MDRV of the boost control chip U1 is connected to the gate of the MOS tube Q2; the drain of the MOS tube Q2 is connected to the output end of the boost control chip U1, and the source is grounded; when the voltage of the terminal pin MDRV exceeds the set value, the MOS tube Q2 is turned on; the terminal pin SDRV of the boost control chip U1 is connected to the gate of the MOS tube Q1 through a resistor R3; the source of the MOS tube Q1 is connected to the output end of the boost control chip U1, and the drain is connected to the next level circuit; when the voltage of the terminal pin SDRV is at the set value, the MOS tube Q1 is turned on.

[0009] Its further technical solution is: a boost inductor L1 and an inductor Jianfeng absorption circuit are connected in series between the terminal pins AVIN and SW of the boost control chip U1; the terminal pin FB is connected to the drain of the MOS tube Q1 through the resistor R9 to feed back the voltage to the boost control chip U1.

[0010] A further technical solution is as follows: a capacitor C14 is provided between the terminal BS and the terminal SW of the boost control chip U1, and is connected to the terminal VCC and PGOOD through a diode D5; the terminal VCC is grounded through a capacitor C12.

[0011] Its further technical solution is: the buck circuit includes a buck control chip U3, whose model is AAP6034A; the terminal IN of the buck control chip U3 is connected to the output end of the boost circuit; the output end inductor L2 of the terminal SW is connected to the filter circuit.

[0012] Its further technical solution is: the pin SW of the step-down control chip U3 is grounded through a diode D1; the anode of the diode D1 is grounded; the output end of the pin FB is connected to feed back the output end voltage.

[0013] Its further technical solution is: the filtering and step-down circuit includes a transistor Q5, whose model is 2SD1804L; the base of the transistor Q5 is grounded through a capacitor C20 and connected to the collector through a resistor R23, the collector is connected to the output end of the step-down circuit, and the emitter is connected to the output interface.

[0014] A further technical solution is: the output interface is provided with a self-resetting fuse F1.

[0015] Its further technical solution is: it also includes an input filter circuit and an output filter circuit; wherein the input filter circuit is arranged at the input end of the boost circuit, and the output filter circuit is arranged at the output end of the buck circuit; the input filter circuit includes capacitors C10, C2, C3, and C4, and the capacitors C10, C2, C3, and C4 are all grounded; the filter circuit includes capacitors C9, C11, and C8, and the capacitors C9, C11, and C8 are all grounded.

[0016] Compared with the prior art, the invention has the following beneficial effects: the invention steps up the input voltage and then steps it down, and then steps it down through a filtering and stepping down circuit, so that the output interface has a stable voltage and current. The invention can effectively control the output interface voltage to be stable at 9V, and the ripple value to be controlled at about 6mv, so that the interference of the power supply to the electronic musical instrument is greatly reduced, and the playing effect is better.

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An exploded view of a pressure-stabilizing filter of a musical instrument according to the present invention;

[0019] Figure 2 A circuit block diagram of a voltage stabilizing filter for a musical instrument according to the present invention;

[0020] Figure 3 A specific circuit diagram of a voltage stabilizing filter for a musical instrument of the present invention;

[0021] Figure 4 The present invention is a specific circuit diagram of a voltage stabilizing filter for a musical instrument. DETAILED DESCRIPTION

[0022] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with specific embodiments below, but is not limited thereto.

[0023] like Figures 1 to 4 Drawings of embodiments of the present invention.

[0024] A pressure stabilizing filter, such as Figure 1 to Figure 2As shown, it includes a housing 10, a circuit board 11 arranged on the inner side of the housing 10, and an input interface and an output interface 18 arranged on the housing 10. The circuit board 11 carries a control circuit. The control circuit includes an anti-reverse connection circuit 12, a boost circuit 13 connected to the output end of the anti-reverse connection circuit 12, a buck circuit 14 connected to the output end of the boost circuit 13, and a filter buck circuit 15 connected to the output end of the buck circuit 14. The output end of the filter buck circuit 15 is connected to the output interface 18. The output interface 18 can be multiple so that multiple musical instruments can share it (in this embodiment, the output interface 18 is an output socket DC55*21mm).

[0025] In this embodiment, the external input voltage is a DC voltage of 5 to 19V, which is boosted to a DC voltage of 22V by the boost circuit 13, then stepped down to a DC voltage of 10.5V by the step-down circuit 14, and then filtered and stepped down by the filter-step-down circuit 15 to reduce the voltage to 9V, and finally the voltage of the output interface 18 is 9V.

[0026] like Figure 3 As shown, the anti-reverse connection circuit 12 includes a MOS tube Q3, whose model is TDM3478. The drain of the MOS tube Q3 is connected to the negative electrode of the power supply terminal, the gate is connected to the positive electrode of the power supply terminal through a resistor R20, and the source is grounded. The gate of the MOS tube Q3 is grounded after being connected in parallel with a diode D6 and a resistor R21. The positive electrode of the diode D6 is grounded. The MOS tube Q3 of the anti-reverse connection circuit 12 acts as a switch. In the case of reverse connection, the MOS tube Q3 is disconnected and the circuit is not conducting.

[0027] Preferably, an input filter circuit 16 is provided at the output end of the anti-reverse connection circuit 12, and is grounded through capacitors C10, C2, C3, and C4 to filter the voltage at the input end.

[0028] like Figure 3As shown, the boost circuit 13 includes a boost control chip U1, whose model is XR4981. The terminal pin VISP of the boost control chip U1 is connected to the output end of the anti-reverse connection circuit 12, and the terminal pins VISN and AVIN are connected in parallel with the output end of the anti-reverse connection circuit 12 through resistors R1 and R2. The terminal pin SW of the boost control chip U1 is connected to the output end. The terminal pin MDRV of the boost control chip U1 is connected to the gate of the MOS tube Q2. The drain of the MOS tube Q2 is connected to the output end of the boost control chip U1, and the source is grounded to act as a switch. When the voltage of the terminal pin MDRV exceeds the set value, the MOS tube Q2 is turned on. The terminal pin SDRV of the boost control chip U1 is connected to the gate of the MOS tube Q1 through a resistor R3. The source of the MOS tube Q1 is connected to the output end of the boost control chip U1 (i.e., the terminal pin SW), and the drain is connected to the next level circuit (i.e., the step-down circuit 14). When the voltage of the terminal pin SDRV is at a set value, the MOS tube Q1 is turned on. The model of the MOS tube Q1 and the MOS tube Q2 are both STN4260, which serve as a switch.

[0029] A boost inductor L1 and an inductor absorbing circuit are connected in series between the pins AVIN and SW of the boost control chip U1. The pin FB is connected to the drain of the MOS tube Q1 through the resistor R9 to feed back the voltage to the boost control chip U1.

[0030] Resistors R1 and R2 are provided between the pins VISP and VISN of the boost control chip U1; the resistors R1 and R2 are connected in parallel. The resistors R1 and R2 are used to detect the input current.

[0031] A capacitor C14 is provided between the BS and SW terminals of the boost control chip U1, and is connected to the VCC and PGOOD terminals through a diode D5. The VCC terminal is grounded through a capacitor C12.

[0032] The pin EN of the boost control chip U1 is connected to the input filter circuit 15 through the resistor R5 for detecting the input voltage.

[0033] The boost circuit 13 boosts the filtered input voltage and increases the input voltage of 5-19V to 22V output.

[0034] Preferably, an output filter circuit 17 is provided between the boost circuit 13 and the buck circuit 14 to filter the output end of the boost circuit, wherein the filter circuit 17 includes capacitors C9, C11, and C8, and the capacitors C9, C11, and C8 are all connected to the ground.

[0035] like Figure 4As shown, the buck circuit 14 includes a buck control chip U3, whose model is AAP6034A. The terminal IN of the buck control chip U3 is connected to the output terminal of the boost circuit 13. The output terminal inductor L2 of the terminal SW is connected to the filter circuit, which has a current stabilizing effect on the current at the output terminal.

[0036] The pin SW of the step-down control chip U3 is grounded through a diode D1. The anode of the diode D1 is grounded. The output end of the pin FB is connected to the output end to feed back the output end voltage. The pin BS is connected to the output end through a capacitor C21.

[0037] The step-down circuit 14 is arranged after the step-up circuit 13 to step down the stepped-up voltage 22V to 10.5V and stabilize the current.

[0038] like Figure 4 As shown, the filter step-down circuit 15 includes a transistor Q5, whose model is 2SD1804L. The base of the transistor Q5 is grounded through a capacitor C20 and connected to the collector through a resistor R23, the collector is connected to the output end of the step-down circuit 14, and the emitter is connected to the output interface 18. The base is connected to the input and output ends, the resistor R23 steps down the voltage, and the capacitor C20 performs filtering, so that the base has a stable voltage, and then the collector and the emitter are turned on to achieve linear voltage regulation and reduce output ripple.

[0039] The output interface 18 is provided with a self-recovery fuse F1, so that the output interface 18 can be protected from short circuit or overcurrent.

[0040] The output end of the step-down circuit 14 can be connected to a plurality of filtering and step-down circuits 15 , so that there are multiple output interfaces 18 , thereby improving practicality.

[0041] The voltage of the output interface 18 is 9V, and the ripple value is about 6mv, so as to adapt to the use of different electronic musical instruments.

[0042] In summary, the present invention steps up the input voltage and then steps it down, and then filters and steps it down through a filter and step-down circuit, so that the output interface has a stable voltage and current. The present invention can effectively control the output interface voltage to be stable at 9V, and the ripple value to be controlled at about 6mv, so that the interference of the power supply to the electronic musical instrument is greatly reduced, and the playing effect is better.

[0043] The above examples are only used to further illustrate the technical content of the present invention, so that readers can understand it more easily, but they do not mean that the implementation of the present invention is limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A voltage-stabilizing filter for a musical instrument, comprising a housing, a circuit board disposed inside the housing, and an input interface and an output interface disposed on the housing; the circuit board carries a control circuit; and is characterized in that: The control circuit includes an anti-reverse connection circuit, a boost circuit connected to the output end of the anti-reverse connection circuit, a buck circuit connected to the output end of the boost circuit, and a filter buck circuit connected to the output end of the buck circuit; the output end of the filter buck circuit is connected to the output interface, and the boost circuit includes a boost control chip U1, whose model is XR4981; the terminal pin VISP of the boost control chip U1 is connected to the output end of the anti-reverse connection circuit, and the terminal pins VISP and VISN are connected to the output end of the anti-reverse connection circuit after being connected in parallel through resistors R1 and R2; the terminal pin SW of the boost control chip U1 is connected to the output end of the boost control chip U1; the terminal pin MDRV of the boost control chip U1 is connected to the gate of the MOS tube Q2; the drain of the MOS tube Q2 is connected to the output end of the boost control chip U1, and the source is grounded; when the voltage of the terminal pin MDRV exceeds the set value, the MOS tube Q2 is turned on; the boost control chip The terminal pin SDRV of U1 is connected to the gate of the MOS tube Q1 through the resistor R3; the source of the MOS tube Q1 is connected to the output end of the boost control chip U1, and the drain is connected to the next level circuit; when the voltage of the terminal pin SDRV is at the set value, the MOS tube Q1 is turned on, and resistors R1 and R2 are arranged between the terminal pins VISP and VISN of the boost control chip U1; the resistors R1 and R2 are connected in parallel, and a boost inductor L1 and an inductor Jianfeng absorption circuit are connected in series between the terminal pins AVIN and SW of the boost control chip U1, and the terminal pin FB is connected to the drain of the MOS tube Q1 through the resistor R9 to feed back the voltage to the boost control chip U1, and a capacitor C14 is arranged between the terminal pin BS and the terminal pin SW of the boost control chip U1, and the terminal pin BS of the boost control chip U1 is connected to the terminal pins VCC and PGOOD through the diode D5, and the terminal pin VCC is grounded through the capacitor C12.

2. A pressure-stabilizing filter for a musical instrument according to claim 1, characterized in that: The anti-reverse connection circuit includes a MOS tube Q3, whose model is TDM3478; the drain of the MOS tube Q3 is connected to the negative electrode of the power supply terminal, the gate is connected to the positive electrode of the power supply terminal through a resistor R20, and the source is grounded; the gate of the MOS tube Q3 is grounded after being connected in parallel with a diode D6 and a resistor R21; the positive electrode of the diode D6 is grounded.

3. A pressure-stabilizing filter for a musical instrument according to claim 1, characterized in that: The buck circuit includes a buck control chip U3, whose model is AAP6034A; the terminal IN of the buck control chip U3 is connected to the output end of the boost circuit; the output end inductor L2 of the terminal SW of the buck control chip U3 is connected to the filter circuit.

4. A pressure-stabilizing filter for a musical instrument according to claim 3, characterized in that: The pin SW of the buck control chip U3 is grounded through a diode D1; the anode of the diode D1 is grounded; the pin FB of the buck control chip U3 is connected to the output end of the buck control chip U3 to feed back the output end voltage.

5. A pressure-stabilizing filter for a musical instrument according to claim 4, characterized in that: The filtering and step-down circuit includes a transistor Q5, whose model is 2SD1804L; the base of the transistor Q5 is grounded through a capacitor C20 and connected to the collector through a resistor R23, the collector is connected to the output end of the step-down circuit, and the emitter is connected to the output interface.

6. A pressure-stabilizing filter for a musical instrument according to claim 5, characterized in that: The output interface is provided with a self-resetting fuse F1.

7. A pressure-stabilizing filter for a musical instrument according to claim 6, characterized in that: It also includes an input filter circuit and an output filter circuit; wherein the input filter circuit is arranged at the input end of the boost circuit, and the output filter circuit is arranged at the output end of the buck circuit; the input filter circuit includes capacitors C10, C2, C3, and C4 connected in parallel, and the capacitors C10, C2, C3, and C4 are all grounded; the filter circuit includes capacitors C9, C11, and C8 connected in parallel, and the capacitors C9, C11, and C8 are all grounded.

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