CN107360503B - Constant-resistance constant-voltage output device and constant-resistance constant-voltage power amplifier - Google Patents
Constant-resistance constant-voltage output device and constant-resistance constant-voltage power amplifier Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention provides a constant-resistance and constant-voltage output device and a constant-resistance and constant-voltage power amplifier, and belongs to the technical field of broadcasting. The device comprises an audio signal input module, a signal processing module, a control module, a load type detection module and an output module, wherein the audio signal is received through the audio signal input module, the signal processing module adjusts the amplitude and the phase of the input audio signal and amplifies and filters the adjusted audio signal, then the load type detection module detects the type of load equipment according to a control instruction output by the control module, and the control module controls the output module to output the audio signal into a mode matched with the type of the load equipment according to the type of the load equipment.
Description
Technical Field
The invention relates to the technical field of broadcasting, in particular to a constant-resistance and constant-voltage output device and a constant-resistance and constant-voltage power amplifier.
Background
The audio power amplifier is divided into a constant voltage mode and a constant resistance mode, the constant voltage output and the constant resistance output of the existing power amplifier are separated and are realized by using different output circuits, the existing constant voltage power amplifier generally adopts a transformer output mode, and a small part of the existing constant voltage power amplifier adopts a transformer-free mode, but the transformer-free mode has single output voltage and cannot be output according to the change of the requirement.
The defects of the existing transformer and the transformer-free power amplifier are as follows:
(a) The power amplifier with the transformer is characterized in that an output conversion transformer and a related feedback circuit are added on the basis of a constant-resistance power amplifier to convert signals into two modes of constant resistance and constant voltage, and the signals are output from different transformer loops.
(b) The existing transformer-free constant voltage power amplifier has the advantages that although an output constant-resistance constant voltage transformer is omitted, the output constant voltage is fixed and single, for example, the constant voltage commonly used in the industry is 70V, 100V, 110V, 120V and the like, one of the fixed outputs is always selected by the existing transformer-free constant voltage power amplifier, the product cannot be changed once produced, and the constant voltage output can only be realized without constant resistance output.
In addition, the binding posts of the constant voltage output and the constant resistance output of the existing power amplifier are separated, when a user uses the power amplifier, the corresponding binding post connection is selected according to the type of the constant resistance and the constant voltage of the loudspeaker, and the loudspeaker is easy to damage when the connection is wrong; and although the fixed resistance and the fixed pressure of the output binding post are separated, when the fixed resistance and the fixed pressure are used by a user, one of the fixed resistance and the fixed pressure can be used at the same time, if the fixed resistance and the fixed pressure binding post are connected with the corresponding loudspeaker, after the fixed resistance and the fixed pressure binding post are started under high power, related circuits are easily damaged or the fixed resistance and the fixed pressure are directly unable to be started, and the wiring and the use are complex.
Therefore, in the prior art, only different output circuits can be used for realizing the constant resistance and constant voltage output, and the constant resistance and the constant voltage cannot be combined for output.
Disclosure of Invention
The invention aims to provide a constant-resistance and constant-pressure output device and a constant-resistance and constant-pressure power amplifier so as to solve the problems.
Embodiments of the present invention are implemented as follows:
the constant-resistance and constant-pressure output device comprises an audio signal input module, a signal processing module, a control module, a load type detection module and an output module, wherein the audio signal input module is coupled with the signal processing module, the signal processing module is coupled with the control module, the signal processing module is further coupled with the output module, the control module is coupled with the load type detection module, the load type detection module is coupled with the output module, the control module is further coupled with the output module, and the output module is used for being coupled with load equipment; the audio signal input module is used for receiving an audio signal; the signal processing module is used for adjusting the amplitude and the phase of the input audio signal and amplifying and filtering the adjusted audio signal; the load type detection module is used for detecting the type of the load equipment according to the control instruction output by the control module, wherein the type of the load equipment is a fixed resistance or fixed voltage type; the control module is used for controlling the output module to output the audio signal into a mode matched with the type of the load equipment according to the type of the load equipment.
In a preferred embodiment of the present invention, the signal processing module includes a filtering module, a signal conditioning module and a power amplifying module, where the filtering module is coupled to the audio signal input module, the filtering module is coupled to the signal conditioning module, the signal conditioning module is coupled to the power amplifying module, and the power amplifying module is respectively coupled to the control module and the output module; the filtering module is used for filtering the received audio signal; the signal adjusting module is used for adjusting the amplitude and the phase of the filtered audio signal so as to acquire an audio signal in a preset audio range; and the power amplification module is used for amplifying the adjusted audio signal.
In a preferred embodiment of the present invention, the control module includes a central processing module, an amplifying gain control module, and an output mode control module, where the central processing module is coupled to the amplifying gain control module and the output mode control module, the amplifying gain control module is coupled to the power amplifying module, the output mode control module is coupled to the output module, and the central processing module is further coupled to the load type detection module; the central processing module is used for controlling the amplification gain control module to change the signal amplification gain of the power amplification module according to the type of the load equipment and outputting a corresponding control instruction to the output mode control module according to the type of the load equipment; the output mode control module is used for adjusting the output mode of the output module according to the control instruction so as to output the audio signal output by the output module into a mode matched with the type of the load equipment.
In a preferred embodiment of the present invention, the amplifying gain control module includes a first switch circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a first capacitor, where the first switch circuit includes a first switch, a second switch, a third switch, and a fourth switch, the first switch circuit is coupled to the central processing module, one end of the first switch is coupled to one end of the first resistor, one end of the second switch is coupled to one end of the second resistor, one end of the third switch is coupled to one end of the third resistor, one end of the fourth switch is coupled to one end of the fourth resistor, the other end of the first resistor, the other end of the second resistor, the other end of the third resistor, the other end of the fourth resistor are all coupled to one end of the fifth resistor, the other end of the fifth resistor is coupled to one end of the sixth resistor, the other end of the first switch, the other end of the second switch, the other end of the third switch, the other end of the fourth resistor are all coupled to one end of the sixth resistor, and the other end of the fourth resistor are coupled to one end of the fourth resistor, respectively.
In a preferred embodiment of the present invention, the output mode control module includes a second switching circuit and a third switching circuit, the second switching circuit includes a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth switch, a sixth switch, a seventh switch and an eighth switch, the third switching circuit includes a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch, the output mode control module further includes a fifth inductor, a sixth inductor, a seventh inductor, a sixth capacitor and a seventh capacitor, the second switching circuit and the third switching circuit are coupled to the central processing module, one end of the fifth switch is coupled to one end of the first inductor, one end of the sixth switch is coupled to one end of the second inductor, one end of the seventh switch is coupled to one end of the third inductor, one end of the eighth switch is coupled with one end of the fourth inductor, the other end of the first inductor, the other end of the second inductor, the other end of the third inductor and the other end of the fourth inductor are coupled with one end of the fifth inductor, one end of the fifth inductor is coupled with one end of the sixth inductor, the other end of the fifth switch, the other end of the sixth switch, the other end of the seventh switch and the other end of the eighth switch are coupled with the other end of the sixth inductor and are coupled with one end of the seventh inductor, the other end of the seventh inductor is coupled with one end of the ninth switch, one end of the tenth switch, one end of the eleventh switch and one end of the twelfth switch respectively, the other end of the ninth switch is coupled with one end of the second capacitor, the other end of the tenth switch is coupled with one end of the third capacitor, the other end of the eleventh switch is coupled with one end of the fourth capacitor, the other end of the twelfth switch is coupled with one end of the fifth capacitor, the other end of the second capacitor is grounded, one end of the sixth capacitor is coupled with the other end of the fifth inductor, the other end of the sixth capacitor is grounded, one end of the seventh capacitor is coupled with the other end of the sixth inductor, and the other end of the seventh capacitor is grounded.
In a preferred embodiment of the present invention, the load type detection module includes a signal loading circuit, a current detection circuit, an amplifying circuit and an analog-to-digital conversion circuit, where the signal loading circuit and the current detection circuit are both coupled to the control module, the signal loading circuit and the current detection circuit are both coupled to the output module, the current detection circuit is coupled to the amplifying circuit, the amplifying circuit is coupled to the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is coupled to the control module.
In a preferred embodiment of the present invention, the signal loading circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, an eighth capacitor, a ninth capacitor, a first relay, a first diode, a first triode, and a standard signal source, one end of the seventh resistor is coupled to the control module, the other end of the seventh resistor is coupled to one end of the eighth resistor and one end of the eighth capacitor, the other end of the eighth resistor is grounded, the other end of the seventh resistor is further coupled to the base of the first triode, the collector of the first triode is coupled to the anode of the first diode, one end of the first relay, the emitter of the first triode is grounded, the cathode of the first diode is coupled to one end of the ninth resistor, the other end of the ninth resistor is coupled to the first relay, the other end of the ninth resistor is grounded, the other end of the first capacitor is further coupled to the base of the first relay, the other end of the tenth resistor is coupled to the other end of the eleventh resistor, and the standard signal source is coupled to the other end of the tenth resistor.
In a preferred embodiment of the present invention, the current detection circuit includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a second relay, a second triode, a second diode, a third diode, a fourth diode, and a current detector, wherein one end of the twelfth resistor is coupled to the control module, the other end of the twelfth resistor is coupled to one end of the thirteenth resistor, one end of the tenth capacitor, a base of the second triode, the other end of the tenth capacitor, the other end of the thirteenth resistor, an emitter of the second triode is grounded, a collector of the second triode is coupled to an anode of the second diode, one end of the second relay, the other end of the eleventh capacitor is grounded, a cathode of the second diode is coupled to one end of the fourteenth resistor, the other end of the fourteenth resistor is coupled to the second relay, the other end of the eleventh resistor is coupled to the anode of the thirteenth diode, the anode of the thirteenth diode is coupled to the anode of the fourth diode, the anode of the thirteenth diode is coupled to the detector, and the anode of the thirteenth diode is coupled to the anode of the thirteenth diode.
In a preferred embodiment of the present invention, the amplifying circuit includes a fourteenth capacitor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and an amplifier, the analog-to-digital conversion circuit includes a sixteenth capacitor, a seventeenth capacitor, a twentieth resistor, and an analog-to-digital conversion chip, one end of the fourteenth capacitor is coupled to the current detector, the other end of the fourteenth capacitor is coupled to one end of the fifteenth resistor and a positive input end of the amplifier, the other end of the fifteenth resistor is grounded, a reverse input end of the amplifier is coupled to one end of the sixteenth resistor, the other end of the sixteenth resistor is grounded, one end of the sixteenth resistor is further coupled to one end of the seventeenth resistor, the other end of the seventeenth resistor is coupled with the output end of the amplifier, the output end of the amplifier is further coupled with one end of the eighteenth resistor, the other end of the eighteenth resistor is coupled with one end of the fifteenth capacitor and one end of the nineteenth resistor, the other end of the fifteenth capacitor and the other end of the nineteenth resistor are grounded, one end of the nineteenth resistor is coupled with the analog-to-digital conversion chip, one end of the sixteenth capacitor is coupled with the analog-to-digital conversion chip, the other end of the sixteenth capacitor is grounded, the analog-to-digital conversion chip is further coupled with one end of the twentieth resistor and one end of the seventeenth capacitor, the other end of the twentieth resistor and the other end of the seventeenth capacitor are grounded, and the analog-to-digital conversion chip is further coupled with the control module.
The constant-resistance and constant-pressure power amplifier comprises load equipment and a constant-resistance and constant-pressure output device, wherein the constant-resistance and constant-pressure output device is coupled with the load equipment.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a constant-resistance constant-voltage output device and a constant-resistance constant-voltage power amplifier, which are characterized in that an audio signal input module is used for receiving an audio signal, a signal processing module is used for adjusting the amplitude and the phase of the input audio signal and amplifying and filtering the adjusted audio signal, then a load type detection module is used for detecting the type of load equipment according to a control instruction output by a control module, the control module is used for controlling the output module to output the audio signal into a mode matched with the type of the load equipment according to the type of the load equipment, and the constant resistance and the constant voltage are integrated into the same circuit for selection output.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a constant-resistance and constant-pressure output device according to an embodiment of the present invention;
FIG. 2 is a block diagram of another device for outputting constant resistance and constant pressure according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an amplifying gain control module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an output mode control module according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a load type detection module according to an embodiment of the present invention;
fig. 6 is a block diagram of a constant-resistance and constant-voltage power amplifier according to an embodiment of the present invention.
Icon: 200-a constant-resistance and constant-pressure power amplifier; 210-a load device; 100-a constant-resistance and constant-pressure output device; 110-an audio signal input module; 120-a signal processing module; 122-a filtering module; 124-a signal conditioning module; 126-a power amplification module; 130-a control module; 132—a central processing module; 134-an amplification gain control module; 136-an output mode control module; 140-a load type detection module; 142-signal loading circuitry; 144-a current detection circuit; 1441-current detector; 146-amplifying circuit; 148-analog-to-digital conversion circuitry; 150-an output module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "coupled," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Referring to fig. 1, fig. 1 is a block diagram of a constant-resistance and constant-voltage output device 100 according to an embodiment of the present invention, where the constant-resistance and constant-voltage output device 100 includes an audio signal input module 110, a signal processing module 120, a control module 130, a load type detection module 140, and an output module 150, the audio signal input module 110 is coupled to the signal processing module 120, the signal processing module 120 is coupled to the control module 130, the signal processing module 120 is further coupled to the output module 150, the control module 130 is coupled to the load type detection module 140, the load type detection module 140 is coupled to the output module 150, the control module 130 is further coupled to the output module 150, and the output module 150 is configured to be coupled to a load device (not shown).
The audio signal input module 110 is configured to receive an audio signal input. As one approach, the audio signal input module 110 may be designed using an interface circuit.
The signal processing module 120 is configured to perform amplitude and phase adjustment on the input audio signal and perform amplification filtering processing on the adjusted audio signal.
The load type detection module 140 is configured to detect a type of the load device according to a control instruction output by the control module 130, where the type of the load device is a fixed resistance or a fixed voltage type.
The control module 130 is configured to control the output module 150 to output the audio signal in a mode matching the type of the load device, i.e. a fixed-resistance mode or a fixed-voltage mode, according to the type of the load device.
Referring to fig. 2, fig. 2 is a block diagram of another constant-resistance constant-voltage output apparatus 100 according to an embodiment of the invention, as a way, the signal processing module 120 includes a filtering module 122, a signal adjusting module 124, and a power amplifying module 126, the filtering module 122 is coupled to the audio signal input module 110, the filtering module 122 is coupled to the signal adjusting module 124, the signal adjusting module 124 is coupled to the power amplifying module 126, and the power amplifying module 126 is coupled to the control module 130 and the output module 150, respectively.
The filtering module 122 is configured to perform filtering processing on the received audio signal, and of course, in order to achieve impedance matching between the output impedance and the load device, matching between the input impedance is also required. In addition, if the frequency of the input audio signal is too high or too low, the requirement of the load device cannot be met, the filtering module 122 may also filter out the audio signal with too high or too low frequency to obtain an audio signal within a preset audio range, for example, the audio signal frequency is generally 20-20KHZ, and the signal conditioning module 124 may filter out the invalid frequencies outside the required frequency band. As one way, the filtering module 122 may be designed with a filtering capacitor or a filtering resistor.
The signal conditioning module 124 is configured to perform amplitude and phase conditioning on the filtered audio signal. As a way, the signal conditioning module 124 may employ the power amplification module 126, which is configured to amplify the conditioned audio signal, where the conditioned audio signal has a possibly low amplitude, so that the low-amplitude audio signal needs to be amplified by the power amplification module 126 and then output, and as a way, the power amplification module 126 includes an amplifying chip, a high-power amplifier tube and related auxiliary circuits, and the low-amplitude signal is amplified into a high-amplitude high-power signal after being comprehensively controlled by the amplifying chip, the high-power amplifier tube and related auxiliary circuits.
As one way, the control module 130 includes a central processing module 132, an amplifying gain control module 134, and an output mode control module 136, where the central processing module 132 is coupled to the amplifying gain control module 134 and the output mode control module 136, respectively, the amplifying gain control module 134 is coupled to the power amplifying module 126, the output mode control module 136 is coupled to the output module 150, and the central processing module 132 is further coupled to the load type detection module 140.
The central processing module 132 is configured to control the amplification gain control module 134 to change the signal amplification gain of the power amplification module 126 according to the type of the load device, and output a corresponding control instruction to the output mode control module 136 according to the type of the load device.
The amplification gain control module 134 receives the related control command sent by the central processing module 132, and performs a corresponding switching action according to the control command, so as to change the signal amplification gain of the power amplification module 126, thereby changing the effective amplitude of the output audio signal.
The output mode control module 136 is configured to adjust an output mode of the output module 150 according to the control instruction, so as to output the audio signal output by the output module 150 into a mode matched with the type of the load device, that is, execute a corresponding switching action according to the control instruction sent by the central processing module 132, adjust a filtering parameter and an effective output impedance of the output module 150, and perform a mode of adjusting the output audio signal to a load device requirement, that is, a constant-resistance mode or a constant-voltage mode.
The output module 150 is further configured to filter out carriers and other unwanted signals in the audio signal, and perform output impedance adjustment, so that the output audio signal reaches a specific output power under a specific impedance condition and is output.
The central processing module 132 generally adopts a single chip microcomputer or an ARM chip with an ARM core, such as STM32FXX series, and the central processing module 132 can perform network communication with an external terminal device or an equivalent device through a network management interface, and further obtain parameter settings of a load device by a user.
The central processing module 132 also communicates with the load type detection module 140 via the SPI, and reads feedback information from the load type detection module 140, i.e., the type of load device.
The central processing module 132 controls the amplification gain control module 134, the output mode control module 136, and the load type detection module 140 through the IO port.
The control module 130 operates as follows:
the central processing module 132 may acquire parameter configuration information of the load device from the user through the network interface in the form of web management web page, including output power, sound volume, frequency modulation input, etc. of the load device, then store the parameter information, send out a load type detection instruction in an initialization period of starting the load device, after receiving the instruction, the load type detection module 140 switches circuit functions, and switches to a load type detection mode, at this time, the load type detection module 140 feeds back relevant characteristic data of the load device, such as load impedance, voltage magnitude, current magnitude, etc., the central processing module 132 determines the type of the load device according to the data, for example, if detecting that the voltage is 2.5V-3.3V, then determines the type of the load device as a fixed resistor, and if the voltage is less than 2.5V, then determines the type of the load device as a fixed voltage; and the central processing module 132 compares the determined result with the configuration parameters of the load device by the user, and if the comparison is consistent, that is, if the configuration parameters of the load device by the user indicate that the load device is of a constant voltage type, and the load device is also determined to be of a constant voltage type, the gain control and output mode control signals in the corresponding modes are started, and the amplification gain control module 134 and the output mode control module 136 perform corresponding switching actions after receiving corresponding instructions, so as to output the audio signals in the corresponding modes.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of an amplifying gain control module 134 according to an embodiment of the present invention, the amplifying gain control module 134 includes a first switching circuit, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first capacitor C1, the first switching circuit includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4, the first switching circuit is coupled with the central processing module 132, one end of the first switch K1 is coupled with one end of the first resistor R1, one end of the second switch K2 is coupled with one end of the second resistor R2, one end of the third switch K3 is coupled with one end of the third resistor R3, one end of the fourth switch K4 is coupled to one end of the fourth resistor R4, the other end of the first resistor R1, the other end of the second resistor R2, the other end of the third resistor R3, and the other end of the fourth resistor R4 are all coupled to one end of the fifth resistor R5, the other end of the fifth resistor R5 is coupled to one end of the sixth resistor R6, the other end of the first switch K1, the other end of the second switch K2, the other end of the third switch K3, and the other end of the fourth switch K4 are all coupled to the other end of the sixth resistor R6, one end of the first capacitor C1 is respectively coupled to the other end of the fifth resistor R5 and one end of the sixth resistor R6, and the other end of the first capacitor C1 is grounded.
The sel_a_1 and sel_a_2 ports of the first switching circuit are coupled to the central processing module 132, and one end of the fifth resistor R5 and the other end of the sixth resistor R6 are further connected to other auxiliary circuits in the amplifying gain control module 134. When the central processing module 132 determines that the current working mode needs to be adopted, namely a constant resistance or constant voltage mode, then sends an instruction through sel_a_1/2, the first switching circuit performs corresponding switching operation according to the instruction class, and when the first switching circuit uses different resistance values of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4, the amplification factor of the whole power amplifier changes, so that the output voltage changes correspondingly, because in the output expression form, except that the output impedance is inconsistent, the gain control is actually used for adjusting the output voltage.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of an output mode control module 136 according to an embodiment of the present invention, where the output mode control module 136 includes a second switching circuit and a third switching circuit, the second switching circuit includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a fifth switch K5, a sixth switch K6, a seventh switch K7, and a eighth switch K8, the third switching circuit includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a ninth switch K9, a tenth switch K10, an eleventh switch K11, and a twelfth switch K12, the output mode control module 136 further includes a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, a sixth capacitor C6, and a seventh switch C7, the second switching circuit and the third switching circuit are all coupled with the central processing module 132, the fifth switch K5 is coupled with the fourth inductor K1, the fifth switch K5 is coupled with the other end of the fourth inductor L6, the eighth switch K7 is coupled with the other end of the fifth switch K6, the fourth switch K6 is coupled with the other end of the fourth switch K6, the eighth switch K7 is coupled with the other end of the fourth switch K6, the fourth switch K7 is coupled with the other end of the fourth switch K7, and the fourth switch K is coupled with the other end of the fourth switch K7 is coupled with the fourth switch K12, the other end of the seventh inductor L7 is coupled to one end of the ninth switch K9, one end of the tenth switch K10, one end of the eleventh switch K11, one end of the twelfth switch K12, the other end of the ninth switch K9 is coupled to one end of the second capacitor C2, the other end of the tenth switch K10 is coupled to one end of the third capacitor C3, the other end of the eleventh switch K11 is coupled to one end of the fourth capacitor C4, the other end of the twelfth switch K12 is coupled to one end of the fifth capacitor C5, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the fourth capacitor C4 is grounded, one end of the sixth capacitor C6 is coupled to the other end of the fifth capacitor L5, the other end of the sixth capacitor C6 is grounded, one end of the seventh capacitor C7 is coupled to the other end of the sixth inductor L6, and the other end of the seventh capacitor C7 is grounded.
The sel_a_1 and sel_a_2 ports of the second switching circuit are coupled to the central processing module 132, the sel_a_1 and sel_a_2 ports of the third switching circuit are coupled to the central processing module 132, and of course, the other end of the fifth inductor L5 and the other end of the seventh inductor L7 are also connected to other auxiliary circuits in the output mode control module 136. After the central processing module 132 determines that the current working mode needs to be adopted, namely a constant resistance or constant voltage mode, then an instruction is sent through sel_a_1/2, the second switching circuit and the third switching circuit perform corresponding switching operation according to the instruction, and when the second switching circuit uses different values of the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 and the third switching circuit uses different values of the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5, the filtering characteristic and the output impedance of the power amplifier output circuit are changed, so that the power amplifier output circuit is matched with the type of load equipment, and the function of switching the output mode control is achieved.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of a load type detection module 140 according to an embodiment of the present invention, where the load type detection module 140 includes a signal loading circuit 142, a current detection circuit 144, an amplifying circuit 146 and an analog-to-digital conversion circuit 148, the signal loading circuit 142 and the current detection circuit 144 are both coupled to the control module 130, the signal loading circuit 142 and the current detection circuit 144 are both coupled to the output module 150, the current detection circuit 144 is coupled to the amplifying circuit 146, the amplifying circuit 146 is coupled to the analog-to-digital conversion circuit 148, and the analog-to-digital conversion circuit 148 is coupled to the control module 130.
The signal loading circuit 142 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, an eighth capacitor C8, a ninth capacitor C9, a first relay JZX1, a first diode D1, a first triode Q1, and a standard signal source AC, one end of the seventh resistor R7 is coupled to the control module 130 through an IOA port, the other end of the seventh resistor R7 is coupled to one end of the eighth resistor R8 and one end of the eighth resistor C8, the other end of the eighth resistor C8 is coupled to the other end of the eighth resistor R8, the other end of the seventh resistor R7 is also coupled to the base of the first triode Q1, the collector of the first triode Q1 is coupled to one end of the first relay JZX1 and the ninth capacitor C9, the ground of the first triode Q1 is coupled to one end of the first relay jx 1, the other end of the cathode of the first triode Q1 is coupled to the other end of the ninth resistor C9, the other end of the ninth resistor C9 is coupled to the other end of the ninth resistor C9 and the other end of the ninth resistor R9 is coupled to the base of the first triode Q1.
The current detection circuit 144 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a second relay JZX2, a second triode Q2, a second diode D2, a third diode D3, a fourth diode D4, and a current detector 1441, wherein one end of the twelfth resistor R12 is coupled to the control module 130, the other end of the twelfth resistor R12 is coupled to one end of the thirteenth resistor R13, one end of the tenth capacitor C10, the base of the second triode Q2 is coupled to the anode of the thirteenth capacitor C12, the other end of the thirteenth resistor C13, the emitter of the second triode Q2 is grounded, the collector of the second triode Q2 is coupled to the anode of the second diode D2, one end of the eleventh resistor C11, the other end of the eleventh resistor C11 is coupled to the anode of the eleventh resistor C2, the anode of the eleventh resistor C11 is coupled to the cathode of the thirteenth capacitor C3, the anode of the eleventh resistor C14 is coupled to the anode of the thirteenth resistor C3, the anode of the thirteenth resistor C4 is coupled to the cathode of the thirteenth resistor C2, the anode of the thirteenth resistor C14 is coupled to the anode of the thirteenth resistor C2, the drain of the thirteenth resistor C2 is coupled to the drain of the collector of the thirteenth resistor Q2, and the drain of the thirteenth resistor is connected to the collector.
The amplifying circuit 146 comprises a fourteenth capacitor C14, a fifteenth capacitor C15, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19 and an amplifier F1, the analog-to-digital converting circuit 148 comprises a sixteenth capacitor C16, a seventeenth capacitor C17, a twenty-first resistor R20 and an analog-to-digital converting chip U1, one end of the fourteenth capacitor C14 is coupled with the current detector, the other end of the fourteenth capacitor C14 is coupled with one end of the fifteenth resistor R15, the positive input end of the amplifier F1 is coupled with the other end of the fifteenth resistor R15, the other end of the fifteenth resistor R1 is grounded, the reverse input end of the amplifier F1 is coupled with one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is grounded, one end of the sixteenth resistor R16 is further coupled with one end of the seventeenth resistor R17, the other end of the seventeenth resistor R17 is coupled with the output end of the amplifier F1, the other end of the eighteenth resistor R18 is further coupled with the output end of the eighteenth resistor R1, the nineteenth resistor R18 is further coupled with the other end of the nineteenth resistor R1, the other end of the seventeenth resistor R16 is coupled with the nineteenth resistor R20, the other end of the nineteenth resistor R1 is further coupled with the other end of the nineteenth resistor R1, the nineteenth resistor R1 is coupled with the other end of the seventeenth resistor R19, the other end of the seventeenth resistor R1 is coupled with the other end of the seventeenth resistor R1, the other end is coupled with the other end of the resistor R1, the seventeenth resistor R1, the resistor is coupled with the other end is coupled with the resistor R1 and the other end, and the resistor is coupled with the other end and the resistor R1 and the resistor R1 and the resistor and the one, the analog-to-digital conversion chip U1 is also coupled to the control module 130.
As shown in the figure, the output module 150 includes a power amplifier output plug, where P1 is a power amplifier output connector, and a P1 post-stage is connected to a load device, i.e. a fixed resistor or a fixed voltage horn, and after the load device is connected to a P1 port, the type of the load device can be determined by testing the equivalent impedance on the P1 port, and the detection principle is as follows: in the startup initialization stage of the load device, the central processing module 132 controls the IOA and IOB ports to switch, and switches the circuit mode to the load device detection mode, at this time, the signal of the standard signal source AC is loaded onto the P1 port, after passing through the load device, returns to the current detector 1441, and the waveforms obtained on the current detector 1441 are different in form and amplitude, and the signal is subjected to analog-to-digital conversion by the analog-to-digital conversion circuit 148, and then fed back to the central processing module 132, after the analysis processing of the data, the central processing module 132 compares the data with the intrinsic data of different load devices, and then the type of the current load device can be analyzed, when the initialization of the load device is completed, the central processing module 132 sends out a normal working instruction, and the IOA and IOB ports switch again, so that the circuit enters the mode state of normal signal output.
In the embodiment of the present invention, the constant-resistance and constant-voltage output device 100 may further include an alarm module, where an alarm is given by the alarm module when the type of the load device is detected to be not matched with the configuration parameters of the load device by the user, so as to avoid damage to the load device due to miswiring or misuse.
In addition, the constant-resistance and constant-voltage output device 100 eliminates the constant-resistance and constant-voltage conversion transformer, and retains all functions of the original transformer, particularly on a high-power amplifier, various costs of production, materials, transportation, installation and the like are greatly reduced, and meanwhile, the size of a machine can be reduced, and the complexity of connecting lines and structural design is reduced.
In addition, in this embodiment, the constant-resistance constant-voltage binding post can be unified to one binding post for outputting, so that the wiring and the use are simple, and the constant-resistance constant-voltage output device 100 can only output one audio signal matched with the type of the load equipment at the same time, thereby effectively reducing the complexity of circuit design.
It should be noted that, when the output mode of the constant-resistance constant-voltage output device 100 is controlled, that is, the constant-resistance mode or the constant-voltage mode is output, or which mode of the constant-voltage modes is commonly determined by two conditions, firstly, the output mode configured in the user Web manager is the output mode, and secondly, the mode calculated by the load type detected by the automatic load type detection module 140 is the mode calculated by the load type detection module, the constant-resistance constant-voltage output device 100 is immediately cut off to the corresponding mode after being started, when the two modes are inconsistent, the control module 130 cuts off the power amplifier output, sends an alarm signal and releases a user mode confirmation signal, and if the user confirms the current use method, the output mode is determined by the user to be the load equipment.
The constant pressure modes generally include 70V/100V/110V/120V/240V and other constant pressure modes.
Referring to fig. 6, fig. 6 is a block diagram of a constant-resistance and constant-voltage power amplifier 200 according to an embodiment of the invention, where the constant-resistance and constant-voltage power amplifier 200 includes a load device 210 and the constant-resistance and constant-voltage output apparatus 100, and the load device 210 is coupled with the constant-resistance and constant-voltage output apparatus 100.
As one approach, the load device 210 may be a horn, sound, or the like. The load device 210 can have two types of constant resistance and constant voltage, and the constant resistance and constant voltage output device 100 can select constant voltage output or constant resistance output according to the type of the load device 210, so that the constant resistance and the constant voltage output can be combined into one circuit output, the load device 210 is effectively prevented from being damaged due to incorrect wiring of the load device 210 or improper use, and the safety of the load device 210 is improved.
In summary, the embodiment of the invention provides a constant-resistance constant-voltage output device and a constant-resistance constant-voltage power amplifier, an audio signal is received through an audio signal input module, a signal processing module adjusts amplitude and phase of the input audio signal and amplifies and filters the adjusted audio signal, then a load type detection module detects the type of load equipment according to a control instruction output by a control module, and the control module controls the output module to output the audio signal into a mode matched with the type of the load equipment according to the type of the load equipment.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The constant-resistance and constant-voltage output device is characterized by comprising an audio signal input module, a signal processing module, a control module, a load type detection module and an output module, wherein the audio signal input module is coupled with the signal processing module, the signal processing module is coupled with the control module, the signal processing module is further coupled with the output module, the control module is coupled with the load type detection module, the load type detection module is coupled with the output module, the control module is further coupled with the output module, and the output module is used for being coupled with load equipment;
the audio signal input module is used for receiving an audio signal;
the signal processing module is used for adjusting the amplitude and the phase of the input audio signal and amplifying and filtering the adjusted audio signal;
The load type detection module is used for detecting the type of the load equipment according to the control instruction output by the control module, wherein the type of the load equipment is a fixed resistance or fixed voltage type;
the control module is used for controlling the output module to output the audio signal into a mode matched with the type of the load equipment according to the type of the load equipment;
the load type detection module comprises a signal loading circuit, a current detection circuit, an amplifying circuit and an analog-to-digital conversion circuit, wherein the signal loading circuit and the current detection circuit are both coupled with the control module, the signal loading circuit and the current detection circuit are both coupled with the output module, the current detection circuit is coupled with the amplifying circuit, the amplifying circuit is coupled with the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is coupled with the control module;
the signal loading circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, an eighth capacitor, a ninth capacitor, a first relay, a first diode, a first triode and a standard signal source, wherein one end of the seventh resistor is coupled with the control module, the other end of the seventh resistor is respectively coupled with one end of the eighth resistor and one end of the eighth capacitor, the other end of the eighth resistor is grounded with the other end of the eighth resistor, the other end of the seventh resistor is also coupled with the base electrode of the first triode, the collector electrode of the first triode is coupled with the anode of the first relay and one end of the ninth capacitor, the emitter electrode of the first triode is grounded, the cathode of the first diode is coupled with one end of the ninth resistor, the other end of the ninth resistor is coupled with the first relay, the other end of the ninth resistor is grounded, the other end of the first relay is also coupled with the tenth resistor and the other end of the tenth resistor is grounded with the standard signal source;
The audio signal input module is designed by adopting an interface circuit.
2. The constant-resistance constant-voltage output device according to claim 1, wherein the signal processing module comprises a filtering module, a signal adjusting module and a power amplifying module, the filtering module is coupled with the audio signal input module, the filtering module is coupled with the signal adjusting module, the signal adjusting module is coupled with the power amplifying module, and the power amplifying module is coupled with the control module and the output module respectively;
the filtering module is used for filtering the received audio signal;
the signal adjusting module is used for adjusting the amplitude and the phase of the filtered audio signal so as to acquire an audio signal in a preset audio range;
and the power amplification module is used for amplifying the adjusted audio signal.
3. The constant-resistance and constant-voltage output device according to claim 2, wherein the control module comprises a central processing module, an amplification gain control module and an output mode control module, the central processing module is respectively coupled with the amplification gain control module and the output mode control module, the amplification gain control module is coupled with the power amplification module, the output mode control module is coupled with the output module, and the central processing module is further coupled with the load type detection module;
The central processing module is used for controlling the amplification gain control module to change the signal amplification gain of the power amplification module according to the type of the load equipment and outputting a corresponding control instruction to the output mode control module according to the type of the load equipment;
the output mode control module is used for adjusting the output mode of the output module according to the control instruction so as to output the audio signal output by the output module into a mode matched with the type of the load equipment.
4. The constant-resistance constant-voltage output apparatus according to claim 3, wherein the amplification gain control module comprises a first switching circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a first capacitor, the first switching circuit comprises a first switch, a second switch, a third switch, and a fourth switch, the first switching circuit is coupled to the central processing module, one end of the first switch is coupled to one end of the first resistor, one end of the second switch is coupled to one end of the second resistor, one end of the third switch is coupled to one end of the third resistor, one end of the fourth switch is coupled to one end of the fourth resistor, one end of the first resistor, one end of the second resistor, one end of the third resistor, one end of the fourth resistor are all coupled to one end of the fifth resistor, one end of the fifth resistor is coupled to one end of the sixth resistor, one end of the other end of the first switch, one end of the third switch, one end of the fourth switch, one end of the other end of the fourth resistor, one end of the fourth resistor is all coupled to one end of the fourth resistor, one end of the other end of the fourth resistor is all connected to one end of the fourth resistor.
5. The constant-voltage output device according to claim 3, wherein the output mode control module comprises a second switching circuit and a third switching circuit, the second switching circuit comprises a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth switch, a sixth switch, a seventh switch and an eighth switch, the third switching circuit comprises a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch, the output mode control module further comprises a fifth inductor, a sixth inductor, a seventh inductor, a sixth capacitor and a seventh capacitor, the second switching circuit and the third switching circuit are all coupled with the central processing module, one end of the fifth switch is coupled with one end of the first inductor, one end of the sixth switch is coupled with one end of the second inductor, one end of the seventh switch is coupled with one end of the third inductor, one end of the eighth switch is coupled with one end of the fourth inductor, one end of the seventh switch is coupled with one end of the fourth inductor, the other end of the seventh switch is coupled with one end of the fifth inductor, the other end of the seventh switch and the other end of the seventh switch is coupled with one end of the fifth inductor, the other end of the seventh switch and the other end of the seventh switch is coupled with the other end of the fifth inductor, one end of the fifth switch and the other end of the fifth switch is coupled with the fifth inductor, one end of the fifth switch and the other end is coupled with the other end of the fifth inductor, and the fifth switch is coupled with the fourth inductor is coupled with the one end and the one end is respectively, the other end of the ninth switch is coupled with one end of the second capacitor, the other end of the tenth switch is coupled with one end of the third capacitor, the other end of the eleventh switch is coupled with one end of the fourth capacitor, the other end of the twelfth switch is coupled with one end of the fifth capacitor, the other end of the second capacitor, the other end of the fourth capacitor and the other end of the fifth capacitor are grounded, one end of the sixth capacitor is coupled with the other end of the fifth inductor, the other end of the sixth capacitor is grounded, one end of the seventh capacitor is coupled with the other end of the sixth inductor, and the other end of the seventh capacitor is grounded.
6. The constant-resistance constant-voltage output device according to claim 1, wherein the current detection circuit comprises a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a second relay, a second triode, a second diode, a third diode, a fourth diode and a current detector, one end of the twelfth resistor is coupled with the control module, the other end of the twelfth resistor is coupled with one end of the thirteenth resistor, one end of the tenth capacitor, a base of the second triode, the other end of the tenth capacitor, the other end of the thirteenth resistor, an emitter of the second triode is grounded, a collector of the second triode is coupled with an anode of the second diode, the second relay, one end of the eleventh capacitor is grounded, a cathode of the second diode is coupled with one end of the fourteenth resistor, the other end of the fourteenth resistor is coupled with the second diode, the other end of the thirteenth resistor is coupled with the anode of the fourth diode, the anode of the thirteenth capacitor is coupled with the detector, and the current detector is coupled with the anode of the thirteenth diode.
7. The constant-resistance constant-voltage output apparatus according to claim 6, wherein the amplifying circuit includes a fourteenth capacitor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and an amplifier, the analog-to-digital conversion circuit includes a sixteenth capacitor, a seventeenth capacitor, a twentieth resistor, and an analog-to-digital conversion chip, one end of the fourteenth capacitor is coupled to the current detector, the other end of the fourteenth capacitor is coupled to one end of the fifteenth resistor, a forward input end of the amplifier, the other end of the fifteenth resistor is grounded, a reverse input end of the amplifier is coupled to one end of the sixteenth resistor, the other end of the sixteenth resistor is grounded, one end of the sixteenth resistor is further coupled to one end of the seventeenth resistor, the other end of the seventeenth resistor is coupled to an output end of the amplifier, the other end of the eighteenth resistor is further coupled to one end of the first resistor, the other end of the eighteenth resistor is coupled to one end of the fifteenth capacitor, the other end of the fifteenth resistor is coupled to the one end of the fifteenth capacitor, the other end of the nineteenth resistor is coupled to the other end of the nineteenth resistor, the nineteenth resistor is further coupled to the other end of the analog-to-digital conversion chip, the nineteenth resistor is coupled to the other end of the nineteenth resistor, the analog-to the other end of the seventeenth resistor is coupled to the analog-to be coupled to the analog-to the seventeenth resistor.
8. A constant-resistance and constant-voltage power amplifier, characterized in that the constant-resistance and constant-voltage power amplifier comprises a load device and the constant-resistance and constant-voltage output device according to any one of claims 1 to 7, and the constant-resistance and constant-voltage output device is coupled with the load device.
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| US7449959B2 (en) * | 2007-01-31 | 2008-11-11 | Texas Instruments Incorporated | Methods and apparatus to detect impedance at an amplifier output |
| CN202309730U (en) * | 2011-11-07 | 2012-07-04 | 沈阳知天星信息技术有限公司 | Wireless early warning information reception and power amplification integrated machine |
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