CN209419782U - Microphone power circuit and recording/playing terminal - Google Patents
Microphone power circuit and recording/playing terminal Download PDFInfo
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- CN209419782U CN209419782U CN201920079636.8U CN201920079636U CN209419782U CN 209419782 U CN209419782 U CN 209419782U CN 201920079636 U CN201920079636 U CN 201920079636U CN 209419782 U CN209419782 U CN 209419782U
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Abstract
The utility model discloses a kind of microphone power circuit and recording/playing terminal, which includes: power supply processing module, exportable a variety of voltages of different sizes；Resistors match module, the resistors match module includes the input terminal being connected with the output end of the power supply processing module, the first output end being connected for the negative terminal with microphone and the second output terminal for being connected with the anode of the microphone, can be between the output end of the power supply processing module and the negative terminal of the microphone, the resistance that load and described each voltage that processing module exports of powering match respectively between the output end of the power supply processing module and the anode of the microphone by the resistors match module.A variety of powering modes may be implemented in microphone power circuit provided by the utility model, so as to the different microphones for electromorphs of compatibility.
Description
Technical field
The utility model relates to recorded broadcast technical field, especially a kind of microphone power circuit and recording/playing terminal.
Background technique
In current recording and broadcasting system, since recorded broadcast host usually supplies microphone only with a kind of power supply mode
Electricity prevents recorded broadcast host from being compatible with the microphone different for electromorphs, thus recorded broadcast scene installation, wiring and other answer
With etc. bring more inconvenience.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of microphone power circuit and recording/playing terminal, Ke Yishi
Existing a variety of powering modes, so as to the different microphones for electromorphs of compatibility.
In order to achieve the above objectives, the technical solution of the utility model provides a kind of microphone power circuit, comprising:
Power supply processing module, exportable a variety of voltages of different sizes；
Resistors match module, the resistors match module include the input being connected with the output end of the power supply processing module
End, the first output end being connected for the negative terminal with microphone and second exporting for being connected with the anode of the microphone
End, can be between the output end of the power supply processing module and the negative terminal of the microphone, institute by the resistors match module
It states and is loaded respectively between the output end of power supply processing module and the anode of the microphone and the power supply processing module output
The resistance that each voltage matches.
Further, the power supply processing module includes:
First control unit；
Power conversion module, the power conversion module are used for the first electricity of output under the control of the first control unit
Pressure and second voltage.
Further, the power supply processing module further includes switch unit；
The switch unit is for exporting tertiary voltage under the control of the first control unit.
Further, the first control unit includes switching device J8, wherein the 1st foot of switching device J8 and the 2nd foot
Between can on-off, between the 3rd foot of switching device J8 and the 4th foot can on-off, the 1st foot of switching device J8 and the 3rd foot connection
5V power supply 5V0_AV.
Further, the power conversion module includes resistance R232, resistance R234, resistance R645, resistance R646, resistance
R647, resistance R648, capacitor C709, capacitor C710, capacitor C712, capacitor C713, capacitor C714, capacitor C715, electrolytic capacitor
CT24, inductance L52, diode D55, power conversion chip U28；
Wherein, the other end of the 2nd foot of one end connection switch device J8 of resistance R234, resistance R234 connects resistance R232
One end, power conversion chip U28 EN foot, GND foot, the resistance of the other end of resistance R232, power conversion chip U28
One end of R648 is grounded, the RT foot of the other end connection power conversion chip U28 of resistance R648；
One end of capacitor C709, one end of capacitor C710, the VIN foot of power conversion chip U28, inductance L52 one end connect
12V power supply 12V_AV is met, the other end of capacitor C709, the other end of capacitor C710 are grounded, and the other end, the power supply of inductance L52 turns
Change the P knot of the SW foot connection diode D55 of chip U28, one end of the N knot connection resistance R645 of diode D55, electrolytic capacitor
One end of the anode of CT24, capacitor C714, the other end of capacitor C714 are grounded by capacitor C715, and electrolytic capacitor CT24's is negative
Pole ground connection, resistance R645 the other end connection one end of resistance R646, one end of resistance R647, power conversion chip U28 FB
Foot, the other end of resistance R646 pass through the COMP foot of capacitor C712 connection power conversion chip U28, power conversion chip U28's
VCC foot is grounded by capacitor C713.
Further, the switch unit includes diode D56, triode Q17, metal-oxide-semiconductor Q18, resistance R620, resistance
R621, resistance R622, resistance R623, capacitor C720, capacitor C721, capacitor C722, capacitor C723；
Wherein, the other end of the 4th foot of one end connection switch device J8 of resistance R620, resistance R620 connects resistance R621
One end, triode Q17 base stage, the emitter ground connection of the other end of resistance R621, triode Q17；
One end of the P knot connection capacitor C720 of P knot connection the 24V power supply 24V_DCIN, diode D56 of diode D56, electricity
Hold one end of C721, one end of resistance R623, metal-oxide-semiconductor Q18 source electrode, the other end of the other end of capacitor C720, capacitor C721
Ground connection, the other end of resistance R623 connect one end of the grid of metal-oxide-semiconductor Q18, resistance R622, the other end connection three of resistance R622
The collector of pole pipe Q17, the drain electrode of metal-oxide-semiconductor Q18 connect one end of one end of capacitor C722, capacitor C723, and capacitor C722's is another
One end, capacitor C723 the other end ground connection.
Further, the resistors match module includes the second control unit；
Wherein, second control unit includes multiple input pins and one-to-one with the multiple input pin
Output pin, and can on-off between the corresponding output pin of each input pin；
Each described input pin connects the input terminal of the resistors match module, each described output pin difference
It is connected with one end of two build-out resistors, and the resistance value of the build-out resistor of different output pin connections is different, described two matchings
The other end of a build-out resistor in resistance is connected with the first output end of the resistors match module, described two matching electricity
The other end of another build-out resistor in resistance is connected with the second output terminal of the resistors match module.
Further, the microphone power circuit further includes being arranged in first output end and the second output terminal
Between coupling filter module.
To achieve the above object, the technical solution of the utility model additionally provides a kind of recording/playing terminal, including above-mentioned wheat
Gram wind power supply circuit, the signal processing circuit handled for the output signal to the microphone and for the letter
The power supply circuit of number processing circuit power supply, is provided between the microphone power circuit and the signal processing circuit and electricity is isolated
Hold.
Further, the recording/playing terminal includes multiple resistors match modules and multiple signal processing circuits.
Microphone power circuit provided by the utility model, the exportable a variety of voltages of different sizes of processing module of powering,
And resistors match module can provide the resistance to match to each voltage of power supply processing module output, may be implemented more
Kind powering mode, so as to the different microphones for electromorphs of compatibility.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, the above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from, in the accompanying drawings:
Fig. 1 is a kind of schematic diagram of microphone power circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of schematic diagram of processing module of powering provided by the embodiment of the utility model；
Fig. 3 is a kind of schematic diagram of resistors match module provided by the embodiment of the utility model；
Fig. 4 is signal processing circuit and resistors match module in a kind of recording/playing terminal provided by the embodiment of the utility model
Schematic diagram；
Fig. 5 is the schematic diagram of the power supply circuit of a kind of pair of signal processing circuit power supply provided by the embodiment of the utility model；
Fig. 6 is a kind of schematic diagram of connecting terminal provided by the embodiment of the utility model.
Specific embodiment
The utility model is described below based on embodiment, but the utility model is not restricted to these implementations
Example.It is detailed to describe some specific detail sections below in the datail description of the utility model, in order to avoid obscuring this
The essence of utility model, there is no narrations in detail for well known method, process, process, element.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it should be understood that term " first ", " second " etc. are used for description purposes only,
It is not understood to indicate or imply relative importance.In addition, in the description of the present invention, unless otherwise indicated, it is " more
It is a " it is meant that two or more.
It is a kind of schematic diagram of microphone power circuit provided by the embodiment of the utility model, the Mike referring to Fig. 1, Fig. 1
Wind power supply circuit includes:
Power supply processing module 1, exportable a variety of voltages of different sizes；
Resistors match module 2, the resistors match module include with it is described power supply processing module output end be connected it is defeated
Enter end, the first output end being connected for the negative terminal with microphone and second defeated for being connected with the anode of the microphone
Outlet, by the resistors match module can it is described power supply processing module output end and the microphone negative terminal between,
Load is exported with the power supply processing module respectively between the output end of the power supply processing module and the anode of the microphone
The resistance that matches of each voltage, wherein the resistance to match can use IEC61938 standard.
Microphone power circuit provided by the embodiment of the utility model, power supply processing module are exportable a variety of of different sizes
Voltage, and resistors match module can provide the resistance that match to each voltage of power supply processing module output, can be with
A variety of powering modes are realized, so as to the different microphones for electromorphs of compatibility.
For example, with reference to Fig. 2, in the utility model embodiment, exportable tri- kinds of electricity of 12V, 24V, 48V of processing module of powering
Pressure, resistors match module can provide the resistance to match to above-mentioned three kinds of voltage respectively.
Wherein, power supply processing module includes first control unit 111, power conversion module 112 and switch unit 113,
Power conversion module 112 is used to export first voltage (12V voltage) and second voltage under the control of first control unit 111
(48V voltage), switch unit 113 are used to export tertiary voltage (24V voltage) under the control of first control unit 111.The first,
Second, third voltage value, which can according to need, voluntarily to be selected.
As shown in Fig. 2, first control unit 111 includes switching device J8, wherein the 1st foot of switching device J8 and the 2nd
Between foot can on-off, between the 3rd foot of switching device J8 and the 4th foot can on-off, the 1st foot of switching device J8 and the 3rd foot connect
5V power supply 5V0_AV is met, for example, switching device J8 can be toggle switch (jumper terminal), in addition, the 5th of switching device J8 the
Foot is vacantly reserved spare with the 6th foot.
Power conversion module 112 includes resistance R232, resistance R234, resistance R645, resistance R646, resistance R647, resistance
R648, capacitor C709, capacitor C710, capacitor C712, capacitor C713, capacitor C714, capacitor C715, electrolytic capacitor CT24, inductance
L52, diode D55, power conversion chip U28.
Wherein, the other end of the 2nd foot of one end connection switch device J8 of resistance R234, resistance R234 connects resistance R232
One end, power conversion chip U28 EN foot, GND foot, the resistance of the other end of resistance R232, power conversion chip U28
One end of R648 is grounded, the RT foot of the other end connection power conversion chip U28 of resistance R648.
One end of capacitor C709, one end of capacitor C710, the VIN foot of power conversion chip U28, inductance L52 one end connect
12V power supply 12V_AV is met, the other end of capacitor C709, the other end of capacitor C710 are grounded, and the other end, the power supply of inductance L52 turns
Change the P knot of the SW foot connection diode D55 of chip U28, one end of the N knot connection resistance R645 of diode D55, electrolytic capacitor
One end of the anode of CT24, capacitor C714, the other end of capacitor C714 are grounded by capacitor C715, and electrolytic capacitor CT24's is negative
Pole ground connection, resistance R645 the other end connection one end of resistance R646, one end of resistance R647, power conversion chip U28 FB
Foot, the other end of resistance R646 pass through the COMP foot of capacitor C712 connection power conversion chip U28, power conversion chip U28's
VCC foot is grounded by capacitor C713, the EP foot ground connection of power conversion chip U28.
Wherein, switch unit 113 includes diode D56, triode Q17, metal-oxide-semiconductor Q18, resistance R620, resistance R621, electricity
Hinder R622, resistance R623, capacitor C720, capacitor C721, capacitor C722, capacitor C723.
Wherein, the other end of the 4th foot of one end connection switch device J8 of resistance R620, resistance R620 connects resistance R621
One end, triode Q17 base stage, the emitter ground connection of the other end of resistance R621, triode Q17.
One end of the P knot connection capacitor C720 of P knot connection the 24V power supply 24V_DCIN, diode D56 of diode D56, electricity
Hold one end of C721, one end of resistance R623, metal-oxide-semiconductor Q18 source electrode, the other end of the other end of capacitor C720, capacitor C721
Ground connection, the other end of resistance R623 connect one end of the grid of metal-oxide-semiconductor Q18, resistance R622, the other end connection three of resistance R622
The collector of pole pipe Q17, the drain electrode of metal-oxide-semiconductor Q18 connect one end of one end of capacitor C722, capacitor C723, and capacitor C722's is another
One end, capacitor C723 the other end ground connection.
Wherein, the model of power conversion chip U28 can use LM5001SD.
In addition, power supply processing module can also include fuse F1, fuse F10, fuse F11, capacitor C716, capacitor
C717, inductance L23, resistance R52, resistance R53, electrolytic capacitor CT9, wherein the leakage of one end connection metal-oxide-semiconductor Q18 of fuse F10
Pole, the N knot of one end connection diode D55 of fuse F11, the other end connection of the other end, fuse F11 of fuse F10
One end of capacitor C717 and one end of inductance L23, other end connection one end of capacitor C716 of inductance L23, fuse F1
One end, the other end of capacitor C716, the other end of capacitor C717 are grounded, the other end and the resistors match module phase of fuse F1
Even, with to its output voltage AUDIO_PHANTOM, and with one end of resistance R52, one end of resistance R53, electrolytic capacitor CT9
Anode be connected, the other end of resistance R52, the other end of resistance R53, electrolytic capacitor CT9 cathode ground connection, pass through fuse
F1, F10, F11 realize short-circuit protection.
Referring to Fig. 3, resistors match module includes the second control unit J5, wherein the second control unit J5 includes 3 inputs
Pin (the 2nd foot, the 4th foot, the 6th foot) and with the one-to-one output pin of the multiple input pin (the 1st foot, the 3rd foot,
5th foot), between the 2nd foot and the 1st foot can on-off, between the 4th foot and the 3rd foot can on-off, can on-off between the 6th foot and the 5th foot.
Each input pin connects the anode of electrolytic capacitor CT6, and connects the defeated of resistors match module by resistance R34
Enter end (i.e. the output end of connection power supply processing module), the cathode of electrolytic capacitor CT6 ground connection, each output pin respectively with
One end of two build-out resistors is connected, and the resistance value of the build-out resistor of different output pin connections is different, in two build-out resistors
The other end of a build-out resistor be connected with the first output end of the resistors match module, in described two build-out resistors
The other end of another build-out resistor is connected with the second output terminal of the resistors match module.
Wherein, in the present embodiment, build-out resistor uses IEC61938 standard, as shown in figure 3, resistance R23 and resistance R33
Resistance value it is identical, size can be 6.81 Ω, for match power supply processing module output 48V voltage (48V_
PHONTOM2), wherein the 1st foot of the second control unit J5 of one end connection of one end and resistance R33 of resistance R23, resistance
The first output end (being connected for the negative terminal MIC2_IN- with microphone) of the other end connection resistors match module of R23, electricity
Hinder the second output terminal (being connected for the anode MIC2_IN+ with microphone) of the other end connection resistors match module of R33.
The resistance value of resistance R25 and resistance R32 are identical, and size can be 1.2k Ω, for matching power supply processing module
The 24V voltage (24V_PHONTOM2) of output, wherein one end of resistance R25 and the second control of one end connection of resistance R32 are single
The 3rd foot of first J5, the first output end of the other end connection resistors match module of resistance R25 is (i.e. for the negative terminal with microphone
MIC2_IN- is connected), the second output terminal of the other end of resistance R32 connection resistors match module (i.e. for microphone just
MIC2_IN+ is held to be connected).
The resistance value of resistance R26 and resistance R31 are identical, and size can be 680 Ω, defeated for matching power supply processing module
12V voltage (12V_PHONTOM2) out, wherein one end of resistance R26 and one end of resistance R31 connect the second control unit
The 5th foot of J5, the first output end of the other end connection resistors match module of resistance R26 is (i.e. for the negative terminal with microphone
MIC2_IN- is connected), the second output terminal of the other end of resistance R31 connection resistors match module (i.e. for microphone just
MIC2_IN+ is held to be connected).
Preferably, referring to Fig. 3, the microphone power circuit further includes the first output end that resistors match module is arranged in
Coupling filter module between the second output terminal of resistors match module, the coupling filter module include capacitor C18, capacitor
C19, capacitor C21, wherein one end of capacitor C18, one end of capacitor C21 connect one end of capacitor C19, the other end of capacitor C18
Connect the first output end of resistors match module, the second output terminal of the other end connection resistors match module of capacitor C21, capacitor
The other end of C19 is grounded.
For example, switching device J8 and the second control unit J5 can use toggle switch in the utility model embodiment
(jumper terminal).
For the microphone power circuit in the utility model embodiment, which utilizes two groups of pipes of toggle switch J8
Foot { (the 1st foot, the 2nd foot) (the 3rd foot, the 4th foot) } constitutes double switch, when (the 1st foot, the 2nd foot) is connected, power conversion chip
The enabled foot EN of U28 is drawn high, power conversion chip U28 work, to make processing module output 48V voltage of powering；When (the 1st foot,
2nd foot) disconnect when, the enabled foot EN of power conversion chip U28 is hanging, and power conversion chip U28 stops working, 12V power supply
The output voltage of 12V_AV is exported by L52, D55, to make processing module output 12V voltage of powering；When (the 3rd foot, the 4th foot)
When connection, so that triode Q17, metal-oxide-semiconductor Q18 is constituted switching circuit conducting, export 24V voltage, wherein above-mentioned three kinds of power supplies mould
Formula is single choice mode, and when processing module of powering exports 48V voltage, the 2nd foot and the 1st foot of the second control unit J5 is indirectly
It is logical, when processing module of powering exports 24V voltage, connected between the 4th foot and the 3rd foot of the second control unit J5, at power supply
When managing module output 12V voltage, connected between the 6th foot and the 5th foot of the second control unit J5, so as to realize 3 kinds of power supplies
Mode can be powered three kinds of microphones.
The utility model embodiment additionally provides a kind of recording/playing terminal, including above-mentioned microphone power circuit, for pair
The signal processing circuit that the output signal of the microphone is handled and the confession for powering to the signal processing circuit
Circuit is provided with isolation capacitance between the microphone power circuit and the signal processing circuit.
Recording/playing terminal in the utility model embodiment can be recorded broadcast host.
Preferably, in the utility model embodiment, the recording/playing terminal includes multiple resistors match modules and multiple
The signal processing circuit, so that multichannel microphone circuit is formed, it, can be simultaneously to multiple wheats to connect multiple microphones simultaneously
Gram wind is powered and handles the audio signal that it is exported.
Wherein, each signal processing circuit may include a signal amplification circuit, can also include amplifying electricity with signal
The connected clamper amplitude limiter circuit of the input terminal on road.
Recording/playing terminal provided by the embodiment of the utility model, user can by other modes such as toggle switches, select with
The powering mode of microphone adaptation can be transmitted audio signal by single line, while give microphone power.
Referring to fig. 4, the recording/playing terminal in the present embodiment includes two-way microphone circuit, wherein microphone circuit includes all the way
Connecting terminal J3, resistors match module 2a, signal amplification circuit 211 and clamper amplitude limiter circuit 221, in the microphone circuit
In, microphone power circuit is isolated by electrolytic capacitor CT4, CT5 (i.e. isolation capacitance) with signal processing circuit, another way Mike
Wind-powered electricity generation road includes connecting terminal J6, resistors match module 2b, signal amplification circuit 212 and clamper amplitude limiter circuit 222, at this
In microphone circuit, microphone power circuit is isolated by electrolytic capacitor CT7, CT8 (i.e. isolation capacitance) with signal processing circuit,
Wherein, in the present embodiment, resistors match module 2a and 2b can share a power supply processing module as shown in Figure 2, and two
The signal processing circuit of road microphone circuit can be powered by same power supply circuit.
Referring to Fig. 5, the power supply circuit for powering to the signal processing circuit may include power conversion chip U2 (such as
Model TPS63700DRCR), resistance R3, resistance R7, resistance R8, resistance R15, capacitor C1, capacitor C2, capacitor C3, capacitor C7,
Capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C14, capacitor C17, diode D3, diode D8, inductance L1, inductance
L2, wherein power conversion chip U2 is boost chip, and the 5V power supply 5V0_AV voltage inputted is converted to -12V output voltage,
L12 and C17 constitutes filter circuit, the ripple in -12V voltage -12VEE to reduce output.
Wherein, the IN foot of resistance R3, capacitor C7, one end of capacitor C8 and power conversion chip U2 connect 5V power supply 5V0_
One end of the VIN foot of another termination power conversion chip U2 of AV, resistance R3, the EN foot of power conversion chip U2, capacitor C1, electricity
Hold the other end ground connection of C1, GND foot, the power conversion chip of the PS_GND foot of power conversion chip U2, power conversion chip U2
The PAD foot of U2 is grounded, and the VREF foot of power conversion chip U2 connects one end of capacitor C2, resistance R7, and the other end of capacitor C2 is grounded,
The FB foot of another termination power conversion chip U2 of resistance R7 and one end of capacitor C3, resistance R15, another termination of capacitor C3
One end of resistance R8, the other end of resistance R8, the other end of resistance R15, the OUT foot of power conversion chip U2, diode D3 P
Knot, the P knot of diode D8 and a termination -12V voltage end of capacitor C9, capacitor C10, capacitor C11, capacitor C9, capacitor C10, electricity
The N of the other end and diode D8 that hold C11 ties ground connection, and the N of diode D3 ties the SW foot and inductance L1 for connecing power conversion chip
One end, the other end ground connection of inductance L1, a termination -12V voltage end of inductance L2, the one of another termination capacitor C17 of inductance L2
End, and the other end ground connection of the output end -12VEE as the power supply module, capacitor C17.
For the microphone circuit where connecting terminal J3, wherein the 3rd foot of connecting terminal J3 is grounded, connecting terminal J3
The 2nd foot be used to connect the anode MIC2_IN+ of a microphone, and be connected with the anode of electrolytic capacitor CT4, connecting terminal J3's
1st foot is used to connect the negative terminal MIC2_IN- of the microphone, and is connected with the anode of electrolytic capacitor CT5, and electrolytic capacitor CT4's is negative
Pole connects the 3rd foot and one end of resistance R21 of diode D4, the output end-of power supply circuit shown in the 1st foot map interlinking 5 of diode D4
12VEE (receive -12V the voltage of power supply circuit output as shown in Figure 5), the 2nd foot of diode D4 meets+12V power supply 12V_
The IN1 foot of another termination operational amplifier U3A of AV, resistance R21 and one end of resistance R27, the other end ground connection of resistance R27,
The cathode of electrolytic capacitor CT5 connects the 3rd foot and one end of resistance R22 of diode D5, shown in the 1st foot map interlinking 5 of diode D5
Output end-the 12VEE (receive -12V the voltage of power supply circuit output as shown in Figure 5) of power supply circuit, the 2nd of diode D5 the
Foot connects+12V power supply 12V_AV, the IN2 foot of another termination operational amplifier U3A of resistance R22 and one end of resistance R28, resistance
The other end of R28 is grounded, one end of RG1 the foot connecting resistance R20 and resistance R29 of operational amplifier U3A, the other end of resistance R20
Connect the OUT1 foot (i.e. the positive output end MIC_IN2+ of signal processing circuit) of operational amplifier U3A, another termination electricity of resistance R29
One end of R30, one end of another terminating resistor R24 of resistance R30 and the RG2 foot of operational amplifier U3A are hindered, resistance R24's is another
The OUT2 foot (i.e. the negative output terminal MIC_IN2- of signal processing circuit) of one termination operational amplifier U3A, operational amplifier U3A's
VCC foot is grounded by capacitor C22, and connects+12V power supply 12V_AV, and the VEE foot of operational amplifier U3A is connect by capacitor C25
Ground, and be connected with the output end-12VEE of power supply circuit shown in fig. 5 (with receive power supply circuit output as shown in Figure 5-
12V voltage).
In addition, the recording/playing terminal in the present embodiment further includes connecting terminal J4, the signal as recording/playing terminal referring to Fig. 6
Interface, wherein the 3rd foot of connecting terminal J4 connects one end of capacitor C24, inductance L3 for inputting+12V voltage, the 3rd foot,
The other end of capacitor C24 is grounded, one end of another termination capacitor C31 of inductance L3 and+12V power supply 12V_AV, capacitor C31's
Other end ground connection, a termination power supply processing module of the 1st foot of connecting terminal J4, the 2nd foot of connecting terminal J4, capacitor C20
Export POWER_PHANTOM, the other end ground connection of capacitor C20, the 5th foot of connecting terminal J4, connecting terminal J4 the 8th foot, connect
The 11st foot of line terminals J4, the 14th foot of connecting terminal J4, the 15th foot of connecting terminal J4, connecting terminal J4 the 16th foot connect
Ground, the 6th foot of connecting terminal J4, the 7th foot of connecting terminal J4 vacantly reserve spare, the 4th foot and capacitor C23 of connecting terminal J4
A termination 5V power supply 5V0_AV, to input 5V voltage, the other end ground connection of capacitor C23, the 9th foot map interlinking 4 of connecting terminal J4
The OUT2 foot (the negative output terminal MIC_IN2- of i.e. first signal processing circuit) of middle operational amplifier U3A, connecting terminal J4's
10th foot connects the OUT1 foot (the positive output end MIC_IN2+ of i.e. first signal processing circuit) of operational amplifier U3A, terminals
OUT2 foot (the negative output terminal MIC_ of i.e. second signal processing circuit of operational amplifier U4A in the 12nd foot map interlinking 4 of sub- J4
IN3-), in the 13rd foot map interlinking 4 of connecting terminal J4 operational amplifier U4A OUT1 foot (i.e. second signal processing circuit
Positive output end MIC_IN3+).
When connecting terminal J3 is connected with the anode of microphone and negative terminal, the positive and negative MIC signal of microphone is from terminals
It is inputted at sub- J3, user can control power supply processing module according to microphone and export corresponding voltage (i.e. in 48V, 24V, 12V
It is a kind of), and the matched resistance of resistors match module offer is provided and is matched, microphone is powered, in addition, logical in signal
Series connection electrolysis capacitor CT4, CT5 in road utilizes the logical of capacitor so that microphone power circuit is isolated with signal processing circuit
The spy for exchanging stopping direct current is new, and d. c. voltage signal is made to give terminal device microphone power from J3 terminal, and voltage is prevented to pass through, and allows
MIC signal passes through, into operational amplifier U3A, R20, R24, R29, R30 constitute signal amplification circuit, by adjusting R20,
The value of R24, R29, R30 control gain, connecting terminal J4 shown in fig. 6 are output to after processing, in addition, clamper amplitude limiter circuit
221 include diode D4, D5, and positive and negative 12V voltage passes through diode D4, D5 clamper clipping, to carry out failure guarantor to power supply
Shield.
The microphone circuit where microphone circuit and connecting terminal J3 where connecting terminal J6 is former in structure and work
Reason aspect is identical, and details are not described herein again, wherein in the present embodiment, operational amplifier U3A, operational amplifier U4A model can be with
For THAT1583.
It, can for electric processing section point by modes such as power supply conversions in recording/playing terminal provided by the embodiment of the utility model
To provide the voltage and+12V, -12V voltage of 12V, 24V, 48V, user can select 3 kinds of power supply 12V/ by toggle switch
One of 24V/48V is powered with headend equipment (microphone) matched power supply to headend equipment (microphone) with being adapted to, thus
Three kinds of microphones for electromorphs can be compatible with, in addition signaling interface part includes two-way MIC Differential Input, can be accessed simultaneously
Two-way microphone.
On the one hand recording/playing terminal provided by the embodiment of the utility model makes the wiring at recorded broadcast scene tail off, is convenient in this way
Construction is conducive to the progress for accelerating construction, while can save material and cost of labor, to improve construction efficiency, reduce at
This；On the other hand, the diversification of powering mode makes using more flexible, and the application compatibility of terminal device (microphone) is more complete, can
Selectivity is more, is conducive to the experience sense for promoting user.
Those skilled in the art will readily recognize that above-mentioned each preferred embodiment can be free under the premise of not conflicting
Ground combination, superposition.
It should be appreciated that above-mentioned embodiment is merely exemplary, and not restrictive, without departing from the utility model
In the case where basic principle, those skilled in the art can be for the various apparent or equivalent modification that above-mentioned details is made
Or replacement, it is all included in the scope of the claims of the utility model.
Claims (10)
1. a kind of microphone power circuit characterized by comprising
Power supply processing module, exportable a variety of voltages of different sizes；
Resistors match module, the resistors match module include with it is described power supply processing module output end be connected input terminal,
The first output end being connected for the negative terminal with microphone and the second output terminal for being connected with the anode of the microphone,
It can be between the output end of the power supply processing module and the negative terminal of the microphone, the confession by the resistors match module
It is loaded respectively between the output end of electric treatment module and the anode of the microphone each with the power supply processing module output
The resistance that kind voltage matches.
2. microphone power circuit according to claim 1, which is characterized in that the power supply processing module includes:
First control unit；
Power conversion module, the power conversion module be used under the control of the first control unit export first voltage and
Second voltage.
3. microphone power circuit according to claim 2, which is characterized in that the power supply processing module further includes switch
Unit；
The switch unit is for exporting tertiary voltage under the control of the first control unit.
4. microphone power circuit according to claim 3, which is characterized in that the first control unit includes derailing switch
Part (J8), wherein between the 1st foot and the 2nd foot of switching device (J8) can on-off, the 3rd foot and the 4th foot of switching device (J8) it
Between can on-off, the 1st foot of switching device (J8) and the 3rd foot connection 5V power supply (5V0_AV).
5. microphone power circuit according to claim 4, which is characterized in that the power conversion module includes resistance
(R232), resistance (R234), resistance (R645), resistance (R646), resistance (R647), resistance (R648), capacitor (C709), capacitor
(C710), capacitor (C712), capacitor (C713), capacitor (C714), capacitor (C715), electrolytic capacitor (CT24), inductance (L52),
Diode (D55), power conversion chip (U28)；
Wherein, the other end of the 2nd foot of one end connection switch device (J8) of resistance (R234), resistance (R234) connects resistance
(R232) the EN foot of one end, power conversion chip (U28), the other end of resistance (R232), power conversion chip (U28)
One end ground connection of GND foot, resistance (R648), the RT foot of other end connection power conversion chip (U28) of resistance (R648)；
One end of capacitor (C709), one end of capacitor (C710), the VIN foot of power conversion chip (U28), inductance (L52) one
End connection 12V power supply (12V_AV), the other end ground connection of the other end of capacitor (C709), capacitor (C710), inductance (L52) it is another
One end, power conversion chip (U28) SW foot connection diode (D55) P knot, diode (D55) N knot connection resistance
(R645) one end of the anode of one end, electrolytic capacitor (CT24), capacitor (C714), the other end of capacitor (C714) pass through capacitor
(C715) it is grounded, the cathode ground connection of electrolytic capacitor (CT24), one end of other end connection resistance (R646) of resistance (R645), electricity
The one end of (R647), the FB foot of power conversion chip (U28) are hindered, the other end of resistance (R646) passes through capacitor (C712) connection electricity
The VCC foot of the COMP foot of source conversion chip (U28), power conversion chip (U28) is grounded by capacitor (C713).
6. microphone power circuit according to claim 4, which is characterized in that the switch unit includes diode
(D56), triode (Q17), metal-oxide-semiconductor (Q18), resistance (R620), resistance (R621), resistance (R622), resistance (R623), capacitor
(C720), capacitor (C721), capacitor (C722), capacitor (C723)；
Wherein, the other end of the 4th foot of one end connection switch device (J8) of resistance (R620), resistance (R620) connects resistance
(R621) base stage of one end, triode (Q17), the other end of resistance (R621), the emitter of triode (Q17) are grounded；
P knot connection 24V power supply (24V_DCIN) of diode (D56), the one of P knot connection capacitor (C720) of diode (D56)
End, one end of capacitor (C721), one end of resistance (R623), metal-oxide-semiconductor (Q18) source electrode, the other end, the capacitor of capacitor (C720)
(C721) other end ground connection, the other end of resistance (R623) connect one end of the grid of metal-oxide-semiconductor (Q18), resistance (R622), electricity
The collector of the other end connecting triode (Q17) of resistance (R622), one end of drain electrode connection capacitor (C722) of metal-oxide-semiconductor (Q18),
One end of capacitor (C723), the other end of capacitor (C722), the other end of capacitor (C723) are grounded.
7. -6 any microphone power circuit according to claim 1, which is characterized in that the resistors match module includes
Second control unit；
Wherein, second control unit includes multiple input pins and exports correspondingly with the multiple input pin
Pin, and can on-off between the corresponding output pin of each input pin；
Each described input pin connects the input terminal of the resistors match module, each described output pin is respectively with two
One end of a build-out resistor is connected, and the resistance value of the build-out resistor of different output pin connections is different, described two build-out resistors
In the other end of a build-out resistor be connected with the first output end of the resistors match module, in described two build-out resistors
The other end of another build-out resistor be connected with the second output terminal of the resistors match module.
8. -6 any microphone power circuit according to claim 1, which is characterized in that the microphone power circuit is also
Including the coupling filter module being arranged between first output end and the second output terminal.
9. a kind of recording/playing terminal, which is characterized in that including any microphone power circuit of claim 1-8, for pair
The signal processing circuit that the output signal of the microphone is handled and the confession for powering to the signal processing circuit
Circuit is provided with isolation capacitance between the microphone power circuit and the signal processing circuit.
10. recording/playing terminal according to claim 9, which is characterized in that the recording/playing terminal includes multiple resistance
With module and multiple signal processing circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920079636.8U CN209419782U (en) | 2019-01-17 | 2019-01-17 | Microphone power circuit and recording/playing terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920079636.8U CN209419782U (en) | 2019-01-17 | 2019-01-17 | Microphone power circuit and recording/playing terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209419782U true CN209419782U (en) | 2019-09-20 |
Family
ID=67943777
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920079636.8U Active CN209419782U (en) | 2019-01-17 | 2019-01-17 | Microphone power circuit and recording/playing terminal |
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| Country | Link |
|---|---|
| CN (1) | CN209419782U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112565978A (en) * | 2020-11-30 | 2021-03-26 | 江苏云界安全技术有限公司 | Moving coil microphone circuit and moving coil microphone |
-
2019
- 2019-01-17 CN CN201920079636.8U patent/CN209419782U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112565978A (en) * | 2020-11-30 | 2021-03-26 | 江苏云界安全技术有限公司 | Moving coil microphone circuit and moving coil microphone |
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