KR102108444B1 - Charging circuit of speaker using audio signals of power amplifier and broadcasting system including the same - Google Patents

Abstract

An objective of the present invention provides a charging circuit of a broadcasting speaker and a broadcasting system including the same, wherein a battery is charged by using a residual audio signal from a power amplifier at an input terminal of a broadcasting speaker, an amplified audio signal (AC 1 to 50 V) output from the power amplifier is directly supplied to the speaker when the audio signal is less than a specific voltage (for example, ±AC 15 V), the audio signal is charged in an embedded battery with a DC voltage through a charging circuit connected to a speaker line with a shunt when the audio signal is the specific voltage or more, and is used as power sources of various active elements such as a protection circuit of the speaker whereby a separate power supply line from the outside is not necessary. The charging circuit according to the present invention is a charging circuit used for a broadcasting system including a charging circuit of a broadcasting speaker that uses an audio signal of a power amplifier, including: a rectification circuit (B1) connected to the power amplifier (100); switching circuits (Q1, Q2) connected to the rectification circuit (B1); a DC-DC converter (U1) that is operated by the switching circuits (Q1, Q2); and a battery (C2) that is charged by an output of the DC-DC converter (U1). When the intensity of the audio signal amplified by the power amplifier (100) is a specific value or more, the battery is charged, and when the intensity of the audio signal is the specific value or more, charging operation is stopped.

Description

Charging circuit of a speaker portion for a broadcast using an audio signal of a power amplifier and a broadcasting system including the same.

The present invention relates to a charging circuit for a speaker unit used in a broadcasting system and a broadcasting system including the same. More specifically, a battery is charged using a surplus audio signal from a power amplifier at an input terminal of a broadcasting speaker unit, but output from the power amplifier. When the amplified audio signal (AC 1 ~ 50V) is less than a specific voltage (eg ± AC 15V), all signals are supplied to the speaker. If the voltage is higher than a certain voltage, the audio signal is shunted to the speaker line ( Charging the built-in battery with a DC voltage through a charging circuit connected with a shunt), and allowing it to be used as a power source for various active element circuits such as a protection circuit of the speaker unit, thereby charging a broadcasting speaker unit that does not require a separate power supply line from the outside. It relates to a circuit and a broadcasting system including the same.

As shown in FIG. 1, a general sound device system receives a wired microphone recording a sound source, a wireless microphone, an antenna splitter connected through each wireless microphone and antennas (ANT), and receives signals from a wireless microphone. At least one wireless receiver that can be used, an audio mixer that mixes analog signals input for each channel, a digital signal processor that is connected to the audio mixer, and adjusts the frequency level of the analog signal It consists of a power amplifier that is connected to an equalizer (EQ) to amplify the analog signal, and at least one speaker to output the amplified analog signal.

The speaker has a dynamic type, an electromagnetic type, an electrostatic type, a dielectric type, and a magnetostrictive type according to the principle and method of converting an electrical signal into sound waves. A dynamic type with good performance is widely used for music reproduction and voice communication.

In the dynamic type, when a negative signal current flows through a coil in a magnetic field of a permanent magnet, a mechanical force acts on the coil according to the strength of the current to use the principle of causing motion.

The electromagnetic type vibrates the iron pieces between the coils by passing a negative current through the coil installed at the end of the permanent magnet, and this vibration is transmitted to the diaphragm through a lever to make a sound. The high frequency characteristics are bad and there are many distortions, and the use is gradually decreasing.

The electrostatic type is sometimes used for high-pitched sound, and the dielectric type and magnetostrictive type are used in the ultrasonic region of 20 kHz or more, not the audible frequency. Among the speakers, a tweeter is particularly used for a high-frequency band (10 kHz or more).

The type in which the diaphragm of the speaker is directly exposed to the air is called a radiation type speaker, and the type in which the diaphragm is placed in the horn is called a horn type speaker. The direct radiation type is mostly a cone speaker that is commonly used in radio and stereo devices, and some use a metal diaphragm.

The horn type is a trumpet-type speaker that can be seen outdoors, such as a station or playground, and has good electrical and acoustic characteristics and good efficiency. In addition, there is an advantage that an acoustic box for accommodating the speaker is not required. However, according to the diameter of the trumpet opening, there is a disadvantage that the lowest frequency of the sound that can come out is limited.

Electric devices are in a burning condition when the operating voltage is at an undesirably high level. Thus, fuses or air-break switches are generally applied to such devices. As part of a 2-way speaker, a high frequency sound unit always faces very weak critical conditions compared to a low frequency sound unit. This is due to the design requirements for high frequency resolution. Generally, it is a voice coil that can cause burns when the speaker is burned out (speaker burnout), and it needs to be replaced with a new device and cannot be repaired by the customer. In particular, a limit is applied to the front stage input and audio amplifier to prevent too high power from being transmitted to the speaker. However, when unexpected situations such as amplifier malfunction, circuit noise, etc. occur, the speaker is not safe. Speaker burnout can also occur in very professional environments, such as concerts with very professional equipment. In the report, regardless of how the input signal is manipulated and transmitted to the speaker, a protection circuit is provided to protect the speaker's own device, or a fault diagnosis system that diagnoses and alerts the speaker to a malfunction is needed. .

On the other hand, as 'Patent Document 1' related to this, Patent Publication No. 10-1999-0005794, "Power amplifier overpower protection device" is disclosed.

According to the patent document 1, the over-power prevention device of the power amplifier 100 disclosed in the prior art (first prior art), as shown in FIG. 2, protects the speaker by blocking over-input to the speaker 130 And the overpower protection device is provided to prevent surprise by sudden noise or vibration of the speaker. The overpower detector 110 detects overpower and turns on / off according to the output of the overpower detector 120 ) Method of the prior art is disclosed.

However, in the case of the first prior art, when the output of the amplifier 100 becomes overpowered, the speaker 130 is turned off, and the user feels frustrated and surge is generated due to a transient state when it is turned on again. There is a problem.

Again, according to the second prior art as the present technology of the 'Patent Document 1', in order to solve the problems of the first prior art, instead of the overpower detection device and the first prior art overpower prevention device of the interrupter method, By inserting the limiter 210 as shown in 3 between the amplifier 200 and the speaker 220, by clipping excessive output or surge (see Fig. 4), the sound is smoothed without affecting the signal at the normal level. And the speaker can be protected.

However, the limiter 210 in the above-described second prior art, as shown in FIG. 3, has to use various active elements (ZD11, TR), the driving power must be applied, and to supply it externally, Since the input power line of the cable must be used, the distance between the amplifying part and the speaker is long in the broadcasting system, and a large number of speakers are used, which adds a lot of cost. On the other hand, if the signal line is combined with the power line, noise and interference may occur have.

On the other hand, the third prior art disclosed in 'Patent Document 2' related to this, the third prior art of Patent Registration No. 10-1349078, relates to a "speaker failure diagnosis system", and multiple speakers without installing separate power and communication lines. It relates to a speaker failure diagnosis system that can automatically diagnose the speaker failure in a broadcasting system using a.

That is, in the third prior art "speaker failure diagnosis system", as shown in Figure 5, the speaker unit (10 ~ 10 + N), the amplifier 20, the diagnostic result collection unit 30 and the control device It consists of (40), the amplifier 20 amplifies and transmits a broadcast signal to a speaker in a conventional broadcasting system, and the speaker units (10 to 10 + N) are connected to the signal line (50) of the amplifier (20). It is connected to use the output of the amplifier 20 as a driving power source to diagnose the presence or absence of a speaker failure and output the diagnosis result to the signal line 50.

That is, the speaker unit 10, as shown in Figure 6, amplifying the output of the amplifier 20 sent to the signal line 50 and a power conversion unit (10a) for supplying power to the drive and , A failure diagnosis unit 10b that receives a driving power from the power conversion unit 10a, transmits a signal to a speaker, measures impedance and compares it with a reference value, thereby performing a speaker diagnosis using an impedance measurement method, And a communication unit 10c that receives driving power from the power conversion unit 10a and generates a diagnosis result based on the results performed by the failure diagnosis unit 10b and outputs the diagnosis result to the signal line 50.

Meanwhile, the diagnostic result collection unit 30 is coupled to the signal line 50 and serves to collect diagnostic results output from the at least one speaker unit 10 to 10 + N.

In addition, the control device 40 serves to demodulate the diagnosis result collected by the diagnosis result collection unit 30 into an original signal, analyze the demodulated signal, and display a speaker failure state.

That is, the power converter 10a includes a normal voltage / current amplifier and amplifies the weak signal output from the amplifier 20 to make it a driving power source, and this is a communication unit 10c and a fault diagnosis unit 10b ), And if the output of the amplifier 20 is used as a driving power source, the inconvenience of separately installing a power line for supplying power as in the prior art can be eliminated, and the cost of installing the power line is also provided. Can be reduced.

However, since the third prior art as described above also needs to amplify the output itself of the amplifier 20 of the signal line 50 and use it as a power source, as shown in FIGS. 5 and 6, it is impossible to output a signal during a fault diagnosis. Since the signal must be output after the fault diagnosis, a delay may occur in the case of an emergency situation that quarrels for 1 ~ 2 seconds during the performance. Conversely, after the signal transmission is finished, the fault diagnosis must be performed. Another problem arises that it is difficult to diagnose at the correct time point during broadcasting because the time point and the signal transmission time point are different.

On the other hand, as 'Patent Document 3' related to this, Patent Registration No. 10-1606441, "The output stage and the speaker protection circuit when the power amplifier is turned on / off" is disclosed.

In the fourth prior art, the output terminal of the power amplifier and the speaker control both the input signal already applied to the amplifier and the DC shock voltage generated inside the amplifier at the time of power on / off. In order to prevent the destruction of the speaker connected to the destruction, it relates to an output terminal and a speaker protection circuit when the power amplifier is turned on / off.

In the fourth prior art, as shown in FIG. 7, it shows a circuit of a power amplifier having an output terminal and a speaker protection circuit when the power is turned on / off, an initial amplification buffer unit 110, an input terminal control unit 130, and differential amplification By including the unit 140, the output terminal protection unit 150, the output amplifying unit 160, and the power supply unit 170, it clearly indicates that power supply from the outside is necessary. And the problems of the second prior art.

Particularly, if the treble speaker does not have a protection circuit at the speaker input terminal, the overvoltage, overcurrent, and DC voltages will cause the voice coil to be pressed, cut off, and burned. Supply is essential.

Patent Publication No. 10-1999-0005794 (published on January 25, 1999), "Power amplifier overpower protection device" Patent Registration No. 10-1349078 (Registration Date January 02, 2014), "Speaker Fault Diagnosis System" Patent registration number 10-1606441 (Registration date March 21, 2016), "Output power and speaker protection circuit when power amplifier is on / off"

An object of the present invention for solving the above problems is to charge the battery using the audio signal from the power amplifier at the input terminal of the broadcast speaker unit, but the amplified audio signal (AC 1 ~ 50V) output from the power amplifier is specified voltage If the voltage is less than (for example, ± AC 15V), it is supplied to the speaker as it is, and for voltages above a certain voltage, the audio signal is charged to the built-in battery with a DC voltage through a charging circuit connected by a shunt to the speaker line. In order to provide a charging circuit for a broadcasting speaker unit that does not require a separate power supply line from the outside and a broadcasting system including the same, by allowing it to be used as a power source for various active element circuits such as a protection circuit of the speaker unit.

A charging circuit for a broadcasting speaker unit using an audio signal of a power amplifier according to an aspect of the present invention is a charging circuit used in a broadcasting system including a charging circuit for a broadcasting speaker unit using an audio signal of a power amplifier, the power amplifier 100 A rectifying circuit B1 connected to; Switching circuits Q1 and Q2 connected to the rectifying circuit B1; A DC-DC converter U1 operated by the switching circuits Q1 and Q2; And a battery C2 charged by the output of the DC-DC converter U1; It is characterized in that when the size of the audio signal amplified by the power amplifier 100 is greater than a certain level, the battery is charged, and when the size of the audio signal is greater than a certain level, the charging operation is stopped.

Preferably, the constant voltage circuit (D1, L1) is inserted between the DC-DC converter (U1) and the battery (C2); Characterized in that it further comprises.

Also, preferably, the voltage divider resistors R1 and R2 are inserted between the rectifying circuit B1 and the switching circuits Q1 and Q2, and the voltage adjusted by the voltage divider resistor is the switching circuits Q1 and Q2. It characterized in that it is applied to the control terminal.

More preferably, at least one of the divided resistors R1 and R2 is characterized in that it is a variable resistor.

Also preferably, in the switching circuits Q1 and Q2, the first switching transistor Q1 operating at a relatively low current and the second switching transistor Q2 operating at a relatively high current are coupled in parallel. It is characterized by being.

Also preferably, a smoothing circuit C1 is inserted between the rectifying circuit B1 and the DC-DC converter U1.

In addition, preferably, the power amplifier 100 and the rectifying circuit (B1) is characterized in that the electrical isolation and inductive coupling through the transformer (T1).

A broadcasting system including a charging circuit of a broadcasting speaker unit using an audio signal of a power amplifier according to another aspect of the present invention includes: the charging circuit; And a protection circuit driven by the output of the charging circuit. It characterized in that it is made by a plurality of speaker units 200 including.

Preferably, the speaker is a 2-way or more speaker having a high-pitched speaker and a low-pitched speaker, and is branched into an HPF that passes relatively high frequencies, a protection circuit and a high-pitched speaker, and LPF and low-pitched speakers that pass relatively low frequencies. , The protection circuit is connected to the input terminal of the treble speaker, and cuts the overvoltage input to the treble speaker by the voltage of the amplified analog audio signal output from the power amplifier to the treble speaker by the overvoltage blocker of the protection circuit It is characterized by protecting.

A broadcasting system including a charging circuit for a broadcasting speaker unit using an audio signal of a power amplifier according to another aspect of the present invention includes: the charging circuit; And a fault diagnosis circuit driven by the output of the charging circuit. It characterized in that it is made by a plurality of speaker units 200 including.

According to a charging circuit for a broadcasting speaker unit using a surplus audio signal of a power amplifier according to the present invention and a broadcasting system including the same, a battery is charged using an audio signal from a power amplifier at an input terminal of a broadcasting speaker unit, but output from the power amplifier If the amplified audio signal (AC 1 ~ 50V) is a voltage below a certain voltage (eg ± AC 15V), it is supplied to the speaker as it is, and when the voltage is above a certain voltage, the audio signal is shunted to the speaker line. Charging the built-in battery with a DC voltage through a connected charging circuit, and allowing it to be used as a power source for various active element circuits, such as a protection circuit for the speaker unit, so that a charging circuit for a broadcasting speaker unit that eliminates the need for a separate power supply line from the outside Including broadcast systems are possible.

That is, by using the audio signal output from the power amplifier, the DC voltage is charged to the battery through the charging circuit provided at the speaker input terminal to supply the charged DC voltage to the protection circuit, even if a separate power cable is not connected to the speaker It became possible to supply power to additional devices.

1 is a block diagram of a typical acoustic device system
2 is a configuration diagram of an over-power prevention device according to a first prior art
Figure 3 is a detailed configuration diagram of the over-power prevention device according to the second prior art
4 is an input and output signal waveform diagram of FIG. 3
5 is a schematic configuration diagram of a failure diagnosis system of a speaker according to the third prior art.
6 is a configuration diagram of the speaker unit of FIG. 5;
7 is a circuit of a power amplifier having an output terminal and a speaker protection circuit when power is turned on / off in the fourth prior art.
Figure 8 is a block diagram provided with a protection circuit of a high-frequency speaker and a charging circuit using an amplified voice signal of a certain voltage or more between the power amplifier and the speaker of the present invention
9 is a detailed circuit diagram of a charging circuit using an audio signal of a power amplifier according to an embodiment of the present invention

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail the configuration and operation of the invention.

8 is a block diagram provided with a protection circuit of a high-frequency speaker and a charging circuit using an amplified voice signal of a specific voltage or higher between the power amplifier and the speaker of the present invention, and FIG. 9 is an audio of a power amplifier according to an embodiment of the present invention It is a detailed circuit diagram of a charging circuit using a signal.

A broadcasting system including a charging circuit for a broadcasting speaker unit using a surplus audio signal of a power amplifier according to the present invention includes a speaker unit 200 connected to a power amplifier 100 in an audio system, and the speaker unit A charging circuit 210 and a protection circuit 220 are provided at the input terminal to block the overvoltage input to the treble speaker 231 to protect the treble speaker (1 kHz to 23 kHz, 10 W to 150 W), and normally from the power amplifier 100. Supply the voltage below the specified voltage (eg ± 15V) of the amplified audio signal (AC 1 ~ 50V) to the treble speaker (231) and bass speaker (20Hz ~ 3 kHz, up to 1000W) (232) at the same time The DC voltage is charged to the battery 212 through a charging circuit 211 connected in parallel to a two-wire line from a power amplifier to a speaker by an audio signal having a specific voltage (eg, ± AC 15V) or more. , Connect a separate power supply to the speaker If not, the DC voltage charged to the protection circuit 222 of the protection circuit unit 220 is supplied from the charging circuit 211 and the battery 212.

For reference, the protection circuit unit 220 includes a high pass filter (HPF) 221 that is a filter for the treble speaker 231 and a low pass filter (LPF) that is a filter for the protection circuit 222 and the bass speaker 232 ( 223), and additionally, a circuit for diagnosing a fault may be added.

The broadcasting system including the charging circuit of the broadcasting speaker unit using the audio signal of the power amplifier of the present invention is provided with a power amplifier 100, a high-pitched speaker 231 and a low-pitched speaker 232, the input terminal of the high-pitched speaker 231 It is provided in, the speaker of which the voltage of the amplified audio signal (AC 1 ~ 50V) output from the power amplifier 100 is supplied to at least one speaker, and at the same time, a DC voltage is supplied to a voice signal having a specific voltage (± AC 15V) or more. A charging circuit unit 210 consisting of a charging circuit 211 and a battery 212 connected in parallel to the two-stranded connection line of the; And a protection circuit 222 provided at the input terminal of the treble speaker 231 and compressing the output analog audio signal or surge of the excessive power amplifier 100 exceeding a threshold. It includes a circuit unit 200.

At this time, the protection circuit 222 is provided at the input terminal of the treble speaker 231, the charging circuit 211 is an audio converter for signal separation and rectification of the amplified voice signal output from the power amplifier 100 ( It includes an audio transformer, a rectifier, a smoothing circuit and a voltage regulator, and is connected to the battery 212, and is connected to the protection circuit 222.

The battery 212 is connected to the protection circuit 222 and supplies DC voltage and current to the protection circuit 222 when no power is supplied.

For example, the amplified analog audio signal (AC 1 to 50V) output from the power amplifier 100 receiving the AC 100V voltage of the sinusoidal wave includes an audio transformer and a charging circuit 211 connected in parallel with the speaker 2 strand line. ) To charge the DC voltage with the battery 212 and supply it to the protection circuit 222. The charging circuit 211 includes a rectifier, a smoothing circuit, and a voltage regulator connected to the audio transformer, and a high-pitched region (± AC 15V) of a specific voltage of the audio signal of the secondary side of the audio transformer ) Cut and rectified through the bridge rectifying circuit, smoothing the rectified pulsating signal through a smoothing circuit and regulating it with a constant voltage through a voltage regulator to supply a predetermined DC voltage (DC 12V or DC 5V) to the battery. It is charged and supplied to the protection circuit 222.

The battery is connected to an IoT device having a microprocessor (MCU) that supplies power and a communication unit (Wi-Fi, or Bluetooth), and the IoT device is connected to the battery through a Wi-Fi or Bluetooth short-range communication. Can display the charging rate and the presence or absence of speaker failure.

The broadcasting system including the charging circuit of the broadcasting speaker unit using the audio signal of the power amplifier of the present invention is a charging circuit 211 and a protection circuit at the input terminal of the speaker between the speaker 230 connected to the power amplifier 100 in the sound device system (222) to protect the treble speaker (1kHz ~ 23 kHz, 10W ~ 150W) by blocking the overvoltage input to the treble speaker 231, and amplified voice signal (AC 1 ~) normally output from the power amplifier 100 50V) is supplied to the treble speaker 231 and the woofer speaker 232, and at the same time, an audio signal having a specific voltage (± AC 15V) or higher is connected through a charging circuit 211 connected in parallel to the two strands of the speaker. The DC voltage is charged by the battery 212, and the charged DC voltage is supplied to the protection circuit from the charging circuit and the battery even if a separate power source is not connected to the speaker.

In the case of a 2-way speaker, the speaker may include a treble speaker 231 in a range of 1 kHz to 23 kHz, 10 W to 150 W, and a woofer 231 in a range of 20 Hz to 3 kHZ, 200 W to 1000 W or more.

Between the power amplifier 100 and the speaker 230, the input terminal of the speaker 230 is provided with a protection circuit 222 for protecting the treble to protect the treble speaker 231.

Between the power amplifier 100 and the speaker 230, the protection circuit 222 provided at the input terminal of the high-pitched speaker 231 compresses the output voltage or surge of the excessive power amplifier exceeding a threshold. ) To protect the treble speaker 231.

Now, a charging circuit using an audio signal of a power amplifier according to an embodiment of the present invention will be described with reference to FIGS. 8 and 9.

The charging circuit unit 210 using the audio signal of the power amplifier according to an embodiment of the present invention, as shown in Figure 8, the power amplifier (power amp) 100, connected to the protection circuit 220 in parallel do.

That is, as shown in Figure 9, the charging circuit 210 is connected to the power amplifier 100 through the input connector (P2), first input connector (P2) is electrically insulated and induced through the transformer (T1) After being combined, it is rectified by direct current by the bridge circuit for rectification (B1).

The output terminal of the bridge circuit is again connected to both ends of the first and second variable resistors R1 and R2 connected in series, and the upper power supply terminals of the first variable resistor R1 are capacitors C1 and DC- for the smoothing circuit. It is connected to the input terminal VIN of the DC converter U1, the lower power supply terminal of the second variable resistor R1 is grounded, and the connection terminals of the first and second variable resistors R1, R2 are connected in parallel to each other. It is connected to the gates G2 of the first and second switching transistors Q1 and Q2.

Meanwhile, the sources of the first and second switching transistors Q1 and Q2 are connected to an upper power supply terminal through a smoothing capacitor C1 of the smoothing circuit, and the first and second switching transistors Q1 , Q2) has a common ground.

For reference, since the first and second switching transistors Q1 and Q2 are connected in parallel, the only difference is a difference in the rated current. For example, the rated current of the first switching transistor Q1 may be 2A, and the rated current of the second switching transistor Q2 may be 30A. At low current, the first switching transistor Q1 It is preferable that the charging circuit itself is protected from a surge voltage by operating, and allowing the second switching transistor Q2 to operate at a high current.

Meanwhile, the output terminal of the DC-DC converter U1 is connected to the battery C2 through the constant voltage circuits D1 and L1, so that the battery C2 is the output voltage of the DC-DC converter U1. It is charged by, and the upper power supply terminal of the battery is connected to the feedback terminal of the DC-DC converter U1 to prevent overcharging.

Meanwhile, the constant voltage diode D1 of the constant voltage circuit is connected in parallel to the output terminal and the ground terminal GND of the DC-DC converter U1, and constitutes a constant voltage reactor L1 and an LC circuit.

Finally, the battery C2 applies driving power to the protection circuit 222 through the output connector P1. However, in the present invention, the output of the battery C2 is not necessarily used only for driving the protection circuit 222, and indicates whether the circuit for detecting a fault or the speaker of the third prior art (see FIG. 6) is operating. Of course, it can be used for various power sources such as circuits.

Now, referring to FIGS. 8 and 9, the operation of the charging circuit will be described. First, the input audio signal amplified by the power amplifier 100 is charged with the protection circuit unit and the speaker units 220 and 230. It is input in parallel to the circuit unit 210.

Thus, an audio signal of AC + 15V or higher or -15V or lower among the amplified analog audio signals is rectified through the audio transformer T1 and the bridge rectifying circuit B1, and the rectified pulsating voltage is a voltage distribution of R1 and R2. When the voltage is controlled by the variable resistance ratio, the G2 stage appears as a divided voltage, and when the divided voltage becomes a constant voltage (eg, DC 5V) or higher, the first switching transistor Q1 is turned on, thereby eventually Since the ground terminal (GND) of the DC-DC converter (U1) is grounded, an audio signal of AC + 15V or more or -15V or less among the analog voice signals is the DC-DC converter (U1) and the constant voltage circuit (D1, L1) ) To charge the battery C2.

On the other hand, if the analog audio signal is a value between AC + 15V and -15V (low voltage), the divided voltage becomes less than a constant voltage (eg, DC 5V), and the first switching transistor Q1 is turned off ( By being open), the ground terminal GND of the DC-DC converter U1 is in a floating state, and charging to the battery is not generated. At this time, the analog audio signal is naturally output to the speakers 231 and 232 through the filters 221 and 223 and the protection circuit 222 of FIG. 8.

Here, N-MOS transistors Q1 and Q2 having drains, gates, and sources are connected in parallel to the G2 terminal, Q1 operates at a current amount of 2A or less, and Q2 is a TR (for high current (2.1 ~ 30A)) TR model rated current and voltage).

As described above, the amplified analog audio signal (AC 1 to 50V) output from the power amplifier 100 receives the DC voltage through the audio transformer and the charging circuit 211 connected in parallel with the two-stranded line of the speaker. ) To be supplied to the protection circuit 222, and the charging circuit 211 is provided with a rectifier, a smoothing circuit and a voltage regulator connected to the audio transformer, and 2 of the audio transformer. Cut the high-pitched region of the +/- specific voltage of the vehicle-side audio signal (hatched part in Fig. 8) and rectify through the bridge rectifying circuit, and smooth the rectified pulse signal through the smoothing circuit, constant voltage through the voltage regulator It is regulated, and the DC voltage (DC 12V or DC 5V) is charged to the battery and supplied to the protection circuit 222.

Therefore, when the analog audio signal is a value between AC + 15V and -15V (low voltage), charging to the battery does not occur, and the analog audio signal is completely output to the speakers 231 and 232, and the analog audio signal is passed. If the value is higher than AC + 15V and less than -15V (high voltage), the voltage of this part is used to charge the battery while cutting the treble area, and only the remaining part is output to the speakers 231 and 232, thus protecting the speaker naturally It also plays a role.

The rectifying circuit uses either a bridge rectifying circuit or a full-wave rectifying circuit.

The battery 212 uses a lithium ion battery as a rechargeable secondary battery.

In addition, the battery 212 supplies power to an IoT device having a microprocessor (MCU) and a communication unit (Wi-Fi, or Bluetooth), and the IoT device is a smartphone through Wi-Fi or Bluetooth short-range communication. The charging rate of the battery and the presence or absence of speaker failure can be displayed.

In summary, the DC voltage and current charged in real time to the battery 212 through the charging circuit 211, the DC voltage and current charged in the battery 212 are treble even if there is no separate power supply to the speaker. And a woofer speaker 231 or 132 or a protection circuit 222 or a fault diagnosis circuit (not shown), which enables a broadcast system having a non-powered driving speaker or a non-power protection circuit, and a speaker with a non-power failure diagnosis function. .

Incidentally, in the case of the charging circuit of the present invention, since the charging operation is not performed at a low voltage, signal distortion can be prevented. Conversely, at a high voltage, the peak portion is cut to be used to charge the battery, thereby protecting the speaker from high voltage. Will be able to exert.

As described above, the present invention has been described with reference to preferred embodiments of the present invention, but the present invention is within the scope of those skilled in the art without departing from the technical spirit and scope of the present invention as set forth in the claims below. It will be understood that various modifications or variations can be carried out.

100: power amplifier
200: speaker unit
210: charging circuit 211: charging circuit
212: battery
220: protection circuit 221: HPF
222: protection circuit 223: LPF
230: speaker 231: treble speaker
232: woofer

Claims (10)

A charging circuit used in a broadcasting system including a charging circuit of a broadcasting speaker unit using an audio signal of a power amplifier,
A rectifying circuit B1 connected to the power amplifier 100;
Switching circuits Q1 and Q2 connected to the rectifying circuit B1;
A DC-DC converter U1 operated by the switching circuits Q1 and Q2; And
A battery C2 charged by the output of the DC-DC converter U1;
It includes,
When the size of the audio signal amplified by the power amplifier 100 is greater than or equal to a certain level, the battery is charged, and when the size of the audio signal is less than a predetermined level, the charging operation is stopped.
The switching circuits Q1 and Q2 are characterized in that a first switching transistor Q1 operating at a relatively low current and a second switching transistor Q2 operating at a relatively high current are coupled in parallel. Charging circuit used in broadcasting systems. According to claim 1,
A constant voltage circuit (D1, L1) inserted between the DC-DC converter (U1) and the battery (C2); Charging circuit used in a broadcasting system, characterized in that it further comprises. According to claim 1,
The voltage divider resistors R1 and R2 are inserted between the rectifying circuit B1 and the switching circuits Q1 and Q2, and a voltage adjusted by the voltage divider resistor is applied to the control terminals of the switching circuits Q1 and Q2. Charging circuit used in a broadcasting system, characterized in that. The method of claim 3,
At least one of the divided voltage resistors (R1, R2) is a charging circuit used in a broadcasting system, characterized in that the variable resistance. delete According to claim 1,
A charging circuit used in a broadcasting system, characterized in that a smoothing circuit (C1) is inserted between the rectifying circuit (B1) and the DC-DC converter (U1). According to claim 1,
The power amplifier 100 and the rectifying circuit (B1) is a charging circuit used in a broadcasting system characterized in that the electrical isolation and inductive coupling through a transformer (T1). The charging circuit of any one of claims 1 to 4, 6 and 7; And
A protection circuit driven by the output of the charging circuit;
Broadcast system, characterized in that made by a plurality of speaker units including (200). The method of claim 8,
The speaker is a 2-way or more speaker having a high-pitched speaker and a low-pitched speaker,
HPF with relatively high frequency and protection circuit and treble speaker, and
It is branched into LPF and woofers that pass relatively low frequencies,
The protection circuit is connected to the input terminal of the treble speaker,
And a system for protecting the treble speaker by blocking the overvoltage input to the treble speaker by the overvoltage blocker of the protection circuit for the voltage of the amplified analog voice signal output from the power amplifier. The charging circuit of any one of claims 1 to 4, 6 and 7; And
A fault diagnosis circuit driven by the output of the charging circuit;
Broadcast system, characterized in that made by a plurality of speaker units including (200).

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