CN214315078U - Adaptive wide power network power amplifier - Google Patents
Adaptive wide power network power amplifier Download PDFInfo
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- CN214315078U CN214315078U CN202023029966.8U CN202023029966U CN214315078U CN 214315078 U CN214315078 U CN 214315078U CN 202023029966 U CN202023029966 U CN 202023029966U CN 214315078 U CN214315078 U CN 214315078U
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Abstract
A self-adaptive wide power network power amplifier comprises a power amplifier module and a power module for supplying power to the power amplifier module; the power module includes EMI filtering unit, protecting against shock relay unit, exchange rectification DC transform unit, main power supply filtering unit, a control unit, high frequency voltage unit, high frequency rectification filtering unit and auxiliary circuit unit, EMI filtering unit, protecting against shock relay unit, exchange rectification DC transform unit, main power supply filtering unit, high frequency voltage unit and high frequency rectification filtering unit connect gradually and form the main circuit, EMI filtering unit connects outside alternating current signal, high frequency rectification filtering unit output DC voltage is the power amplifier module power supply, control unit detects DC voltage and adjusts the DC voltage of main circuit output when output DC voltage is too big. The utility model discloses the power module of well power amplifier can the voltage standard of self-adaptation global scope, does not be used as mains voltage and switches and supplies power for the power amplifier.
Description
Technical Field
The utility model belongs to the technical field of the power amplifier technique and specifically relates to a wide power network power amplifier of self-adaptation.
Background
At present, several different voltage standards exist in the world, two general use voltages are provided, namely 100V-130V and 220V-240V, and the traditional power amplifier has different power supply designs aiming at different voltage standards of different countries. Can only be used for power supply of corresponding countries and regions.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wide power network power amplifier of self-adaptation, the utility model discloses the power module of well power amplifier can the voltage standard of self-adaptation global scope, does not be used as mains voltage and switches and supplies power for the power amplifier. In order to achieve the above purpose, the utility model adopts the following technical scheme:
a self-adaptive wide power network power amplifier comprises a power amplifier module and a power module for supplying power to the power amplifier module; the power supply module comprises an EMI filtering unit, an anti-impact relay unit, an AC rectification DC conversion unit, a main power supply filtering unit, a control unit, a high-frequency voltage unit, a high-frequency rectification filtering unit and an auxiliary circuit unit, the EMI filtering unit, the anti-impact relay unit, the AC rectification DC conversion unit, the main power supply filtering unit, the high-frequency voltage unit and the high-frequency rectification filtering unit are sequentially connected to form a main circuit, the control unit is arranged between the main power supply filter unit and the high-frequency voltage unit and controls the voltage input into the high-frequency voltage unit by the main power supply filter unit, the EMI filter unit is connected with an external alternating current signal, the high-frequency rectification filter unit outputs direct current voltage to supply power for the power amplification module, the control unit detects the direct current voltage and adjusts the direct current voltage output by the main circuit when the output direct current voltage is overlarge.
Furthermore, the power amplifier module comprises a sound channel signal input unit, a small signal amplification unit, a gain control and adjustment unit, a mode selection unit, a voltage limit and amplitude limit control unit, a signal amplification unit, a low-pass filtering unit and a signal output unit which are connected in sequence.
Furthermore, the sound channel signal input unit comprises two input sound channels, the small signal amplification unit comprises two small signal amplifiers, the gain control adjustment unit comprises two gain control adjusters, the voltage limit amplitude limiting control unit comprises two voltage limiters, the signal amplification unit comprises two groups of signal amplifier components, the low-pass filtering unit comprises two low-pass filters, and the signal output unit comprises two output sound channels; one input sound channel is sequentially connected with a small signal amplifier, a gain control regulator, a mode selection unit, a voltage limiter, a signal amplifier component, a low-pass filter and an output sound channel; the other input channel is connected in turn to another small signal amplifier, another gain control adjuster, a mode selection unit, another limiter, another signal amplifier component, another low pass filter, and another output channel.
Further, the signal amplifier assembly comprises a preposed signal amplifier and a signal amplifier arranged at the output end of the preposed signal amplifier.
Furthermore, the power module further comprises an anti-impact relay control unit, and the anti-impact relay control unit is connected with the anti-impact relay unit.
Furthermore, the control unit comprises an error sampling amplification unit, an optical coupler and an IC chip, wherein the IC chip is integrated with a current source clamp, a comparator, an SR trigger, an AND gate, an oscillator unit and an MOSFET (metal oxide semiconductor field effect transistor), the sampling end of the error sampling amplification unit is connected with the output end of the high-frequency rectification filter unit and samples the output direct-current voltage, the output end of the error sampling amplification unit is connected with an input pin of the IC chip through the optical coupler, the inside of the input pin of the IC chip is connected with the input end of the current source clamp, the output end of the current source clamp is connected with the reverse input end of the comparator, the output end of the comparator is connected with the R end of the SR trigger, the output end of the SR trigger is connected with the input end of the AND gate, the output end of the AND gate is connected with the grid electrode of the MOS transistor, the drain electrode of the MOS transistor forms the output pin of the IC chip, and the output pin is a control end for controlling the voltage input from the main power supply filter unit to the high-frequency voltage unit, the source electrode of the MOS tube is connected with the homodromous input end of the comparator, the grounding end of the MOS tube forms a grounding pin of the IC chip, the VCC pin of the IC chip is connected with electricity, the inside of the VCC pin is connected with the input end of the oscillator unit, and the output end of the oscillator unit is respectively connected with the S end of the SR trigger and the input end of the AND gate.
Further, the auxiliary circuit unit includes starting circuit and protection circuit, and starting circuit's input is connected with the output of protecting against shock relay unit, and the output of starting circuit connects control unit's VCC pin and protection circuit respectively and for the control unit and the power supply of protection circuit, the direct current voltage of protection circuit detection output.
Further, the power module outputs +/-5V voltage and +/-HIV high voltage, the power module provides +/-5V voltage for the small signal amplification unit, and the power module provides +/-HIV high voltage for the signal amplification unit.
Adopt above-mentioned technical scheme, through the power module of special design, the alternating current passes through AC IN power input port to EMI filtering unit, protecting against shock relay unit, exchange rectification DC conversion unit, the direct current after the rectification transform carries out main power source filtering through main power source filtering unit, then adjust output voltage through the control unit, carry out high frequency vary voltage through high frequency voltage unit, carry out rectification filtering through rectification filtering module at last, output stable DC power supply is the power amplifier power supply, consequently this power module can the different alternating voltage of self-adaptation and supply power for the power amplifier.
Drawings
Fig. 1 is a schematic diagram of a power supply module.
Fig. 2 is a block diagram of the control unit.
Fig. 3 is a schematic diagram of a power amplifier module.
Detailed Description
The present invention will be described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-3, a power amplifier of a self-adaptive wide power network includes a power amplifier module, a power module for supplying power to the power amplifier module, and a display panel 11, where the display panel 11 is provided with a clipping indicator light, a signal indicator light, a protection indicator light, and a power indicator light.
The power module comprises an EMI filtering unit, an anti-impact relay unit, an alternating current rectification direct current conversion unit, a main power supply filtering unit, a control unit, a high-frequency voltage unit, a high-frequency rectification filtering unit and an auxiliary circuit unit, wherein the EMI filtering unit, the anti-impact relay unit, the alternating current rectification direct current conversion unit, the main power supply filtering unit, the high-frequency voltage unit and the high-frequency rectification filtering unit are sequentially connected and form a main circuit, and the control unit is arranged between the main power supply filtering unit and the high-frequency voltage unit and controls the voltage input into the high-frequency voltage unit by the main power supply filtering unit. EMI filtering unit connects outside alternating current signal, and high frequency rectification filtering unit output 5V and HIV high voltage are the power supply of power amplifier module, and protecting against shock relay control unit is connected and control protecting against shock relay unit with protecting against shock relay unit.
The control unit detects the direct current voltage and adjusts the direct current voltage output by the main circuit when the output direct current voltage is overlarge.
Specifically, the control unit comprises an error sampling and amplifying unit, an optical coupler and an IC chip, wherein the IC chip is integrated with a current source clamp, a comparator, an SR trigger, an AND gate, an oscillator unit and an MOSFET (metal oxide semiconductor field effect transistor), the sampling end of the error sampling and amplifying unit is connected with the output end of the high-frequency rectifying and filtering unit and samples the output direct-current voltage, the output end of the error sampling and amplifying unit is connected with the input pin of the IC chip through the optical coupler, the inside of the input pin of the IC chip is connected with the input end of the current source clamp, the current source clamp is a 1mA current source with 5 muA hysteresis, the output end of the current source clamp is connected with the reverse input end of the comparator, the output end of the comparator is connected with the R end of the SR trigger, the output end of the SR trigger is connected with the input end of the AND gate, the output end of the AND gate is connected with the grid electrode of the MOS tube, and the drain electrode of the MOS tube forms the output pin of the IC chip, the output pin is a control end and used for controlling the voltage input to the high-frequency voltage unit by the main power supply filter unit, the source electrode of the MOS tube is connected with the homodromous input end of the comparator, the grounding end of the MOS tube forms the grounding pin of the IC chip, the VCC pin of the IC chip is connected with the electricity, the interior of the VCC pin is connected with the input end of the oscillator unit, and the output end of the oscillator unit is respectively connected with the S end of the SR trigger and the input end of the AND gate.
By adopting the control unit, the error sampling and amplifying unit samples the output direct current voltage, an error signal introduces a feedback signal reflecting the state of the direct current voltage into an input pin of an IC chip through an optical coupler, when the output direct current voltage exceeds a target voltage stabilization value, the luminous intensity of a light emitting diode in the optical coupler becomes strong, a photosensitive tube is conducted and deepened, a current source clamp is pulled down to exceed a clamp rated threshold value, a comparator is turned over to generate a trigger signal of '0', an SR trigger is turned over to be in a 0 state, the level of Q output closes an AND gate, a passage of a clock signal sent by an oscillator unit to an MOSFET tube is cut off, so that the MOSFET tube is in a cut-off state, the direct current voltage output by a main circuit starts to fall, the pull-down current at the input pin starts to be reduced, and before the recovery is not carried out, the signal output by the comparator is sampled at the beginning of each period of the clock signal and the result is analyzed, the AND gate is always closed, the MOSFET is always in cut-off state (one or more time signal periods) until the direct current voltage output by the main circuit is regulated to a target voltage stabilizing value, at the moment, the SR trigger is set to be 'l', the AND gate is opened, the MOSFET is switched on, and the clock switching period is executed to perform energy supplement.
The current source clamp and the comparator are used for detecting a feedback signal which is introduced into the input pin and reflects the voltage state of the output direct-current voltage; the SR flip-flop and the gating circuit formed by the AND gate sample and logically convert the detection result of the output end of the comparator by using the rising edge of each period of the clock signal of the oscillator unit so as to judge whether to switch on/off the MOSFET. Sampling and logically converting the output end of the comparator at the rising edge of each period of the clock signal of the oscillator unit, and if the sampling result is high level, switching on the power MOSFET tube in the period of the clock signal and working according to 67% duty ratio; otherwise, the MOSFET is turned off and kept off to skip the period. The comparator output is resampled at the beginning of the next clock cycle to determine the execution state of the next clock cycle. The method is different from the traditional PWM control voltage stabilization mode, and the pulse width in each period is not adjusted; instead, the sampling result of the feedback signal at the beginning of each period of the clock signal is used to turn on or off the drive signal mode (rated duty cycle ratio clock) input by the MOSFET so as to turn on the MOSFET or keep off and skip the clock signal period to regulate the output voltage, thereby realizing the voltage stabilization control.
The auxiliary circuit unit comprises a starting circuit and a protection circuit, the input end of the starting circuit is connected with the output end of the anti-impact relay unit, the output end of the starting circuit is respectively connected with the VCC pin of the control unit and the protection circuit and supplies power to the control unit and the protection circuit, and the protection circuit detects the output direct-current voltage.
The power amplifier module comprises a sound channel signal input unit, a small signal amplification unit, a gain control adjustment unit, a mode selection unit 10, a voltage limit amplitude limiting control unit, a signal amplification unit, a low-pass filtering unit and a signal output unit which are connected in sequence. The power supply module provides +/-5V voltage for the small signal amplification unit and +/-HIV high voltage for the signal amplification unit.
The sound channel signal input unit comprises two input sound channels 1 which are a left sound channel and a right sound channel respectively, the small signal amplification unit comprises two small signal amplifiers 2, the gain control adjustment unit comprises two gain control adjusters 3, the voltage limit amplitude limiting control unit comprises two voltage limiters 4, the signal amplification unit comprises two groups of signal amplifier assemblies 5, each signal amplifier assembly 5 comprises a front signal amplifier 6 and a signal amplifier 7 arranged at the output end of the front signal amplifier 6, the low-pass filtering unit comprises two low-pass filters 8, and the signal output unit comprises two output sound channels 9; one input channel 1 is sequentially connected with a small signal amplifier 2, a gain control regulator 3, a mode selection unit 10, a voltage limiter 4, a signal amplifier component 5, a low-pass filter 8 and an output channel 9; the other input channel 1 is connected in turn to another small signal amplifier 2, another gain control adjuster 3, a mode selection unit 10, another limiter 4, another signal amplifier component 5, another low pass filter 8 and another output channel 9.
Adopt above-mentioned technical scheme, through the power module of special design, the alternating current passes through AC IN power input port to EMI filtering unit, protecting against shock relay unit, exchange rectification DC conversion unit, the direct current after the rectification transform carries out main power source filtering through main power source filtering unit, then adjust output voltage through the control unit, carry out high frequency vary voltage through high frequency voltage unit, carry out rectification filtering through rectification filtering module at last, output stable DC power supply is the power amplifier power supply, consequently this power module can the different alternating voltage of self-adaptation and supply power for the power amplifier.
Claims (8)
1. A self-adaptive wide power network power amplifier is characterized in that: the power amplifier comprises a power amplifier module and a power supply module for supplying power to the power amplifier module;
the power supply module comprises an EMI filtering unit, an anti-impact relay unit, an AC rectification DC conversion unit, a main power supply filtering unit, a control unit, a high-frequency voltage unit, a high-frequency rectification filtering unit and an auxiliary circuit unit, the EMI filtering unit, the anti-impact relay unit, the AC rectification DC conversion unit, the main power supply filtering unit, the high-frequency voltage unit and the high-frequency rectification filtering unit are sequentially connected to form a main circuit, the control unit is arranged between the main power supply filter unit and the high-frequency voltage unit and controls the voltage input into the high-frequency voltage unit by the main power supply filter unit, the EMI filter unit is connected with an external alternating current signal, the high-frequency rectification filter unit outputs direct current voltage to supply power for the power amplification module, the control unit detects the direct current voltage and adjusts the direct current voltage output by the main circuit when the output direct current voltage is overlarge.
2. The adaptive wide power network power amplifier of claim 1, wherein: the power amplification module comprises a sound channel signal input unit, a small signal amplification unit, a gain control and adjustment unit, a mode selection unit, a voltage limit amplitude limiting control unit, a signal amplification unit, a low-pass filtering unit and a signal output unit which are sequentially connected.
3. The adaptive wide power network power amplifier of claim 2, wherein: the sound channel signal input unit comprises two input sound channels, the small signal amplification unit comprises two small signal amplifiers, the gain control and adjustment unit comprises two gain control adjusters, the voltage limit amplitude limiting control unit comprises two voltage limiters, the signal amplification unit comprises two groups of signal amplifier components, the low-pass filtering unit comprises two low-pass filters, and the signal output unit comprises two output sound channels;
one input sound channel is sequentially connected with a small signal amplifier, a gain control regulator, a mode selection unit, a voltage limiter, a signal amplifier component, a low-pass filter and an output sound channel;
the other input channel is connected in turn to another small signal amplifier, another gain control adjuster, a mode selection unit, another limiter, another signal amplifier component, another low pass filter, and another output channel.
4. The adaptive wide power network power amplifier of claim 3, wherein: the signal amplifier assembly comprises a preposed signal amplifier and a signal amplifier arranged at the output end of the preposed signal amplifier.
5. The adaptive wide power network power amplifier of claim 1, wherein: the power module further comprises an anti-impact relay control unit, and the anti-impact relay control unit is connected with the anti-impact relay unit.
6. The adaptive wide power network power amplifier of claim 1, wherein: the control unit comprises an error sampling and amplifying unit, an optical coupler and an IC chip, wherein the IC chip is integrated with a current source clamp, a comparator, an SR trigger, an AND gate, an oscillator unit and an MOSFET (metal oxide semiconductor field effect transistor), the sampling end of the error sampling and amplifying unit is connected with the output end of the high-frequency rectifying and filtering unit and samples the output direct-current voltage, the output end of the error sampling and amplifying unit is connected with the input pin of the IC chip through the optical coupler, the inside of the input pin of the IC chip is connected with the input end of the current source clamp, the output end of the current source clamp is connected with the reverse input end of the comparator, the output end of the comparator is connected with the R end of the SR trigger, the output end of the SR trigger is connected with the input end of the AND gate, the output end of the AND gate is connected with the grid electrode of an MOS (metal oxide semiconductor field effect transistor), the drain electrode of the MOS transistor forms the output pin of the IC chip, and the output pin is the control end for controlling the voltage input of the main power supply filtering unit to the high-frequency voltage unit, the source electrode of the MOS tube is connected with the homodromous input end of the comparator, the grounding end of the MOS tube forms a grounding pin of the IC chip, the VCC pin of the IC chip is connected with electricity, the inside of the VCC pin is connected with the input end of the oscillator unit, and the output end of the oscillator unit is respectively connected with the S end of the SR trigger and the input end of the AND gate.
7. The adaptive wide power network power amplifier of claim 6, wherein: the auxiliary circuit unit includes starting circuit and protection circuit, and starting circuit's input is connected with the output of protecting against shock relay unit, and the VCC pin and the protection circuit of the control unit are connected respectively to starting circuit's output and for the control unit and the power supply of protection circuit, the direct current voltage of protection circuit detection output.
8. The adaptive wide power network power amplifier of claim 2, wherein: the power module outputs +/-5V voltage and +/-HIV high voltage, the power module provides +/-5V voltage for the small signal amplification unit, and the power module provides +/-HIV high voltage for the signal amplification unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023029966.8U CN214315078U (en) | 2020-12-16 | 2020-12-16 | Adaptive wide power network power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023029966.8U CN214315078U (en) | 2020-12-16 | 2020-12-16 | Adaptive wide power network power amplifier |
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| Publication Number | Publication Date |
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| CN214315078U true CN214315078U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023029966.8U Active CN214315078U (en) | 2020-12-16 | 2020-12-16 | Adaptive wide power network power amplifier |
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Address after: 510820, Guangzhou, Guangdong province Huadu District charcoal step Feida Industrial Park Patentee after: Guangzhou Feida Audio Co.,Ltd. Address before: 510820, Guangzhou, Guangdong province Huadu District charcoal step Feida Industrial Park Patentee before: FIRST AUDIO MANUFACTURING Co.,Ltd. |