CN201533437U

CN201533437U - Microphone LED circuit driven by phantom power

Info

Publication number: CN201533437U
Application number: CN2009202645833U
Authority: CN
Inventors: 杨志豪
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-12-09
Filing date: 2009-12-09
Publication date: 2010-07-21
Anticipated expiration: 2019-12-09
Also published as: WO2011069308A1

Abstract

The utility model relates to a microphone LED circuit driven by phantom power. The LED circuit comprises a control circuit and LEDs; two ends of each of the LEDs which are connected in series are connected in parallel with MOS pipes; a capacitor and a resistor, which are connected in parallel with each other, are connected between the grid electrode and the source electrode of each MOS pipe; and the control circuit controls the conducting and the cutting off of the MOS pipes by charging and discharging the capacitors through the resistors, so as to control the lighting and the extinguishing of the LEDs. As the circuit can control the LEDs without the aid of special electrical level transfer circuit, the utility model has the advantages of compact circuit, low cost, and good EMC performance; and as the amount of the LEDs capable of being connected is large (theoretically, a plurality of LEDs can be connected as long as the voltage drop required for lighting the LEDs is not larger than a designed given value, such as 24V), the utility model can provide instructions for various operating functions of the microphone, so as to facilitate use.

Description

A kind of led circuit that adopts the microphone of phantom power driving

Technical field

The utility model relates to the microphone field, specifically is meant a kind of led circuit that is applied to adopt in the microphone that phantom power drives.

Background technology

Electret Condencer Microphone has advantages such as frequency band is wide, response curve is straight, output is high, nonlinear distortion is little, transient response is good and is widely used in various occasions.Capacitance microphone generally is made up of electric capacity cartridge and prime amplifier two parts, and the electric capacity cartridge needs a polarizing voltage (electret exception), and prime amplifier also needs electricity consumption.Their required power supplys all carry supply by holding wire, do not transmit but do not influence signal, and such supply power mode is called Phantom Power, then is called phantom power for the power supply of its power supply specially.Phantom power is carried out the international standard IEC 268 that the International Power committee formulates, this standard is limited in below 10 milliamperes the electric current of PHANTOM POWER (because electric current transmits on the same line road with signal, electric current is crossed the amplitude that senior general reduces audio signal), therefore must reduce the various device power consumption on the microphone, wherein requiring for the LED that is used to indicate is that all LED total currents are limited in 2 milliamperes as far as possible.

Therefore traditional microphone generally adopts mechanical switch that the function of microphone is controlled, and adopts on microphone body the mode of printing mark to point out people to operate, and some microphone only is provided with a power supply indicator (LED), to save power consumption.When using a plurality of LED to carry out the difference indication, the control mode that present known solution is that LED is in parallel and employing is complicated realizes energy-conservation, and it has following shortcoming: when the LED of opening and closing indication usefulness, the variation of electric current will produce noise by force; Can only carry out parallel connection with a kind of LED of color; The circuit complexity, the cost height.

The utility model content

The problem that the utility model need solve provides a kind of at the drive circuit that adopts a plurality of LED light in the phantom power supplied microphone, and it is little that it is disturbed microphone signal, uses flexibly stable performance.

According to the above-mentioned problem that needs solution, the technical scheme that the utility model is taked is: a kind of led circuit that adopts the microphone of phantom power driving is provided, the LED that comprises control circuit and series connection, the LED two ends of described each series connection all are parallel with metal-oxide-semiconductor, and the metal-oxide-semiconductor grid connects the controlled circuit control conducting of control circuit or ends; Be connected with electric capacity in parallel and resistance between described metal-oxide-semiconductor grid and source electrode, control circuit by resistance to the conducting that discharges and recharges the control metal-oxide-semiconductor of electric capacity with end; Described resistance and electric capacity two ends connect the series rectifier circuit that two diodes are formed respectively, and the tie point of two diodes connects control circuit by an electric capacity.

Concrete, described control circuit adopts microcontroller or pierce circuit.

Preferably, described diode in series positive pole connects power supply by parallel resistor, and the series diode negative pole is by a pressurizer ground connection.

With respect to prior art, the beneficial effects of the utility model are:

(1) control of LED need not any special level shifting circuit, and circuit is succinct, and cost is low, and circuit need not DC-DCTransducer, the EMC performance is good;

(2) attachable LED quantity many (the LED quantity that can connect be in theory when lighting these LED needed voltage drop to be no more than the set-point of design just passable, as 24V), can provide indication to the various operating functions of microphone, be convenient for people to use;

(3) because LED connects mutually, the electric current that each LED passed through is identical, can guarantee the brightness unanimity of all LED;

(4) can use the LED of different colours, use flexibly.

Description of drawings

Fig. 1 is the utility model first embodiment circuit theory schematic diagram;

Fig. 2 is the utility model second embodiment circuit theory schematic diagram.

Embodiment

Understanding for the ease of those skilled in the art is described in further detail the utility model below in conjunction with drawings and Examples:

As Fig. 1 is the utility model first embodiment circuit theory schematic diagram.The utility model comprises the LED D1-Dn of control circuit and series connection, and the LED two ends of each series connection all are parallel with metal-oxide-semiconductor T1-Tn, all is connected with capacitor C 1-Cn in parallel and resistance R 1-Rn between metal-oxide-semiconductor grid and source electrode; Described resistance R 1-Rn and capacitor C 1-Cn two ends connect the series rectifier circuit that two diodes are formed respectively, and the tie point of two diodes connects control circuit by an electric capacity.The LED D1-Dn positive pole of described series connection connects power supply by parallel resistor, and series LED D1-Dn negative pole is by a pressurizer ground connection.

During work, LED gets electric from PHANTOM POWER by two resistance R x and Ry, for each LED, the MOSFET pipe of a parallel connection is arranged.Pairing LED is not worked by short circuit when this MOSFET conducting in parallel, and MOSFET by the time, corresponding LED is bright.Control circuit sends square-wave signal, and by after capacitor C x1-Cxn and the rectifies, C1-Cn's this signal charges to capacitor respectively, and then controls the conducting of each metal-oxide-semiconductor and end.Wherein control circuit adopts microprocessor, connects each capacitor C x1-Cxn by each I/O mouth of microprocessor.

When capacitor C 1-Cn both end voltage exceeds the conducting valve threshold voltage of metal-oxide-semiconductor, the metal-oxide-semiconductor conducting, Bing Lian LED extinguishes with it.Each I/O mouth of microcontroller provides square-wave signal, and the conducting voltage of MOSFET is at 2.4V, and microcontroller can provide the voltage of 3V usually, meets the demands.Because metal-oxide-semiconductor is a high-impedance component, discharging and recharging by corresponding resistance of capacitor C1-Cn undertaken, so the electric current that discharges and recharges is very little, thereby reaches the purpose of low-power consumption; The time that discharges and recharges on the other hand is also very short.

When electric current flows through LED, as last link connection one of series LED Individual pressurizer, it can not only can also absorb pressure drop unnecessary in the series LED chain for microcontroller provides a stable voltage, makes circuit more stable.

When using the square wave signal controlling, only adopt diode and capacitor bank to realize level conversion, complicated level shifting circuit in the relative prior art, cost reduces greatly.

As Fig. 2 is the utility model second embodiment circuit theory schematic diagram.Wherein said control circuit adopts oscillator, and all the other are all identical with embodiment one.In fact control circuit can adopt other any similar signal generator, does not enumerate one by one at this.

Above embodiment only is the preferable implementation of the utility model, can not limit the utility model with this, under the utility model design prerequisite that do not come off, its any being equal to of doing is replaced and minor variations all belongs to protection range of the present utility model.

Claims

1. led circuit that adopts the microphone that phantom power drives comprises the LED of control circuit and series connection, and it is characterized in that: the LED two ends of described each series connection all are parallel with metal-oxide-semiconductor, and the metal-oxide-semiconductor grid connects the controlled circuit control conducting of control circuit or ends.

2. the led circuit of the microphone that employing phantom power according to claim 1 drives, it is characterized in that: be connected with electric capacity in parallel and resistance between described metal-oxide-semiconductor grid and source electrode, control circuit by resistance to the conducting that discharges and recharges the control metal-oxide-semiconductor of electric capacity with end.

3. the led circuit of the microphone that employing phantom power according to claim 2 drives, it is characterized in that: described resistance and electric capacity two ends connect the series rectifier circuit that two diodes are formed respectively, and the tie point of two diodes connects control circuit by an electric capacity.

4. according to the led circuit of the microphone of each described employing phantom power driving among the claim 1-3, it is characterized in that: described control circuit adopts microcontroller or pierce circuit.

5. the led circuit of the microphone that employing phantom power according to claim 4 drives, it is characterized in that: described diode in series positive pole connects power supply by parallel resistor, and the series diode negative pole is by a pressurizer ground connection.