An adaptive wide power supply network amplifier

Abstract

An adaptive wide power network power amplifier includes a power amplifier module and a power module for supplying power to the power amplifier module; the power module includes an EMI filter unit, an anti-shock relay unit, an AC rectifier-DC conversion unit, a main power filter unit, a control circuit, a high-frequency voltage unit, a high-frequency rectifier-filter unit, and an auxiliary circuit unit; the EMI filter unit, the anti-shock relay unit, the AC rectifier-DC conversion unit, the main power filter unit, the high-frequency voltage unit, and the high-frequency rectifier-filter unit are sequentially connected to form a main circuit; the EMI filter unit is connected to an external AC signal; the high-frequency rectifier-filter unit outputs a DC voltage to supply power to the power amplifier module; the control circuit detects the DC voltage and adjusts the DC voltage output by the main circuit when the output DC voltage is too large. The power module of the power amplifier in the present invention can adapt to global voltage standards and supply power to the power amplifier without switching the power supply voltage.

Description

Technical Field

[0001] The invention relates to the technical field of power amplifiers, in particular to an adaptive wide power supply network power amplifier. Background Art

[0002] There are several different voltage standards in the world. Generally speaking, there are two types of voltages, 100V~130V and 220V~240V. Traditional amplifiers have different power supply designs for different voltage standards in different countries. They can only be used for power supplies in corresponding countries and regions. Summary of the invention

[0003] The purpose of the present invention is to provide an adaptive wide power network amplifier, in which the power module of the amplifier can adapt to the voltage standard of the global scope, and the power amplifier is powered without switching the power supply voltage. To achieve the above purpose, the present invention adopts the following technical solutions:

[0004] An 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 comprises an EMI filter unit, an anti-shock relay unit, an AC rectification and DC conversion unit, a main power filter unit, a control circuit, a high-frequency voltage unit, a high-frequency rectification and filtering unit and an auxiliary circuit unit; the EMI filter unit, the anti-shock relay unit, the AC rectification and DC conversion unit, the main power filter unit, the high-frequency voltage unit and the high-frequency rectification and filtering unit are sequentially connected to form a main circuit; the control circuit is arranged between the main power filter unit and the high-frequency voltage unit and controls the voltage input from the main power filter unit to the high-frequency voltage unit; the EMI filter unit is connected to an external AC signal; the high-frequency rectification and filtering unit outputs a DC voltage to supply power to the power amplifier module; the control circuit detects the DC voltage and adjusts the DC voltage output by the main circuit when the output DC voltage is too large.

[0005] Furthermore, the power amplifier module includes a channel signal input unit, a small signal amplification unit, a gain control adjustment unit, a mode selection unit, a compression and limiting control unit, a signal amplification unit, a low-pass filtering unit and a signal output unit which are connected in sequence.

[0006] Furthermore, the channel signal input unit includes two input channels, the small signal amplification unit includes two small signal amplifiers, the gain control adjustment unit includes two gain control adjusters, the compression and limiting control unit includes two compressors, the signal amplification unit includes two groups of signal amplifier components, the low-pass filtering unit includes two low-pass filters, and the signal output unit includes two output channels; one of the input channels is connected to the small signal amplifier, the gain control adjuster, the mode selection unit, the compressor, the signal amplifier component, the low-pass filter and the output channel in sequence; the other input channel is connected to another small signal amplifier, another gain control adjuster, the mode selection unit, another compressor, another signal amplifier component, another low-pass filter and another output channel in sequence.

[0007] Furthermore, the signal amplifier assembly includes a pre-signal amplifier and a signal amplifier arranged at the output end of the pre-signal amplifier.

[0008] Furthermore, the power module also includes an anti-shock relay control unit, and the anti-shock relay control unit is connected to the anti-shock relay unit.

[0009] Furthermore, the control circuit includes an error sampling and amplifying unit, an optical coupler and an IC chip, wherein the IC chip integrates a current source clamp, a comparator, an SR trigger, an AND gate, an oscillator unit and a MOSFET tube, the sampling end of the error sampling and amplifying unit is connected to the output end of the high-frequency rectification and filtering unit and samples the output DC voltage, the output end of the error sampling and amplifying unit is connected to the input pin of the IC chip through the optical coupler, the input pin of the IC chip is internally connected to the input end of the current source clamp, the output end of the current source clamp is connected to the reverse input end of the comparator, and the input end of the comparator is connected to the reverse input end of the comparator. The output end is connected to the R end of the SR trigger, the output end of the SR trigger is connected to the input end of the AND gate, the output end of the AND gate is connected to the gate of the MOS tube, the drain of the MOS tube forms the output pin of the IC chip, the output pin is the control end for controlling the voltage input from the main power filter unit to the high-frequency voltage unit, the source of the MOS tube is connected to the same-direction input end of the comparator, the ground end of the MOS tube forms the ground pin of the IC chip, the VCC pin of the IC chip is powered, the inside of the VCC pin is connected to the input end of the oscillator unit, and the output end of the oscillator unit is respectively connected to the S end of the SR trigger and the input end of the AND gate.

[0010] Furthermore, the auxiliary circuit unit includes a starting circuit and a protection circuit, the input end of the starting circuit is connected to the output end of the anti-shock relay unit, the output end of the starting circuit is respectively connected to the VCC pin of the control circuit and the protection circuit and supplies power to the control circuit and the protection circuit, and the protection circuit detects the output DC voltage.

[0011] Furthermore, 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.

[0012] By adopting the above technical solution, through a specially designed power module, the AC power is transmitted through the AC IN power input port to the EMI filter unit, the anti-shock relay unit, and the AC rectifier-DC conversion unit. The rectified and converted DC power is filtered by the main power filter unit, and then the output voltage is adjusted by the control unit, and the high-frequency voltage unit performs high-frequency transformation. Finally, the rectification and filtering module performs rectification and filtering, and a stable DC power supply is output to power the power amplifier. Therefore, the power module can adapt to different AC voltages to power the power amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the power module.

[0014] Figure 2 This is the module diagram of the control unit.

[0015] Figure 3 This is a schematic diagram of the power amplifier module. DETAILED DESCRIPTION

[0016] The present invention is described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1-3 As shown, an adaptive wide power network power amplifier includes a power amplifier module, a power module for supplying power to the power amplifier module, and a display panel 11. The display panel 11 is provided with a clipping indicator light, a signal indicator light, a protection indicator light, and a power indicator light.

[0018] The power module includes an EMI filter unit, an anti-shock relay unit, an AC rectifier-DC conversion unit, a main power filter unit, a control circuit, a high-frequency voltage unit, a high-frequency rectifier-filter unit, and an auxiliary circuit unit. The EMI filter unit, the anti-shock relay unit, the AC rectifier-DC conversion unit, the main power filter unit, the high-frequency voltage unit, and the high-frequency rectifier-filter unit are sequentially connected to form a main circuit. The control circuit is arranged between the main power filter unit and the high-frequency voltage unit and controls the voltage input from the main power filter unit to the high-frequency voltage unit. The EMI filter unit is connected to an external AC signal, the high-frequency rectifier-filter unit outputs ±5V and ±HIV high voltages to power the power amplifier module, and the anti-shock relay control unit is connected to the anti-shock relay unit and controls the anti-shock relay unit.

[0019] The control circuit detects the DC voltage and adjusts the DC voltage output by the main circuit when the output DC voltage is too large.

[0020] Specifically, the control circuit includes an error sampling and amplifying unit, an optical coupler and an IC chip. The IC chip integrates a current source clamp, a comparator, an SR trigger, an AND gate, an oscillator unit and a MOSFET tube. The sampling end of the error sampling and amplifying unit is connected to the output end of the high-frequency rectification and filtering unit to sample the output DC voltage. The output end of the error sampling and amplifying unit is connected to the input pin of the IC chip through the optical coupler. The input pin of the IC chip is internally connected to the input end of the current source clamp. The current source clamp is a 1mA current source clamp with a 5μA hysteresis. The output end of the current source clamp is connected to the reverse input end of the comparator. The output end of the comparator is connected to the R end of the SR trigger, the output end of the SR trigger is connected to the input end of the AND gate, the output end of the AND gate is connected to the gate of the MOS tube, the drain of the MOS tube forms the output pin of the IC chip, the output pin is the control end, which controls the voltage input from the main power filter unit to the high-frequency voltage unit, the source of the MOS tube is connected to the same-direction input end of the comparator, the ground end of the MOS tube forms the ground pin of the IC chip, the VCC pin of the IC chip is powered, the inside of the VCC pin is connected to the input end of the oscillator unit, and the output end of the oscillator unit is respectively connected to the S end of the SR trigger and the input end of the AND gate.

[0021] With the above control circuit, the error sampling and amplifying unit samples the output DC voltage, and the error signal introduces the feedback signal reflecting the state of the DC voltage into the input pin of the IC chip through the optocoupler. When the output DC voltage exceeds the target voltage regulation value, the luminous intensity of the light-emitting diode in the optocoupler becomes stronger, the conduction of the photosensitive tube becomes deeper, the current source clamp is pulled down to exceed the clamp rated threshold value, the comparator flips, and a "0" trigger signal is generated. The SR trigger flips to the 0 state, and the level of the Q output closes the AND gate, cutting off the path of the clock signal sent by the oscillator unit to the MOSFET tube. Therefore, the MOSFET tube is in the cut-off state, the DC voltage output by the main circuit begins to decrease, and the pull-down current at the input pin begins to decrease. Before recovery, the signal output by the comparator is sampled and the result is analyzed at the beginning of each cycle of the clock signal, and the AND gate is always closed. The MOSFET tube is always (one or more time signal cycles) cut off until the DC voltage output by the main circuit is adjusted down to the target voltage regulation value. At this time, the SR trigger is set to "1", the AND gate is opened, the MOSFET tube is turned on, the clock switching cycle is executed, and energy is replenished.

[0022] The current source clamp and comparator are used to detect the feedback signal of the voltage state of the output DC voltage introduced into the input pin; and the SR trigger and the gate circuit constituted by the AND gate use the rising edge of each cycle of the clock signal of the oscillator unit to sample and logically transform the detection result of the comparator output to determine whether to turn on / off the MOSFET tube. The comparator output is sampled and logically transformed at the rising edge of each cycle of the oscillator unit clock signal. If the sampling result is high, the power MOSFET tube is turned on in this clock signal cycle and works at a 67% duty cycle; otherwise, the MOSFET tube is turned off, kept off and skipped this cycle. The comparator output is resampled at the beginning of the next clock signal cycle to determine the execution state of the next clock signal cycle. It is different from the traditional PWM control voltage regulation method. It does not adjust the pulse width in each cycle; instead, it uses the feedback signal sampling result at the beginning of each cycle of the clock signal to turn on or off the (rated duty cycle clock) drive signal mode of the MOSFET tube input to turn on the MOSFET tube, or keep it off and skip the clock signal cycle to adjust the output voltage and achieve voltage regulation control.

[0023] The auxiliary circuit unit includes a starting circuit and a protection circuit. The input end of the starting circuit is connected to the output end of the anti-shock relay unit. The output end of the starting circuit is respectively connected to the VCC pin of the control circuit and the protection circuit and supplies power to the control circuit and the protection circuit. The protection circuit detects the output DC voltage.

[0024] The power amplifier module includes a channel signal input unit, a small signal amplification unit, a gain control adjustment unit, a mode selection unit 10, a pressure limiting control unit, a signal amplification unit, a low-pass filter unit and a signal output unit 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.

[0025] The channel signal input unit includes two input channels 1, which are a left channel and a right channel respectively; the small signal amplifying unit includes two small signal amplifiers 2; the gain control adjusting unit includes two gain control adjusting devices 3; the compression and limiting control unit includes two compressors 4; the signal amplifying unit includes two groups of signal amplifier components 5; the signal amplifier component 5 includes a pre-signal amplifier 6 and a signal amplifier 7 arranged at the output end of the pre-signal amplifier 6; the low-pass filtering unit includes two low-pass filters 8; and the signal output unit includes two output channels 9; one of the input channels 1 is connected to the small signal amplifier 2, the gain control adjusting device 3, the mode selecting unit 10, the compressor 4, the signal amplifier component 5, the low-pass filter 8 and the output channel 9 in sequence; the other input channel 1 is connected to another small signal amplifier 2, another gain control adjusting device 3, the mode selecting unit 10, another compressor 4, another signal amplifier component 5, another low-pass filter 8 and another output channel 9 in sequence.

[0026] By adopting the above technical solution, through a specially designed power module, the AC power is transmitted through the AC IN power input port to the EMI filter unit, the anti-shock relay unit, and the AC rectifier-DC conversion unit. The rectified and converted DC power is filtered by the main power filter unit, and then the output voltage is adjusted by the control unit, and the high-frequency voltage unit performs high-frequency transformation. Finally, the rectification and filtering module performs rectification and filtering, and a stable DC power supply is output to power the power amplifier. Therefore, the power module can adapt to different AC voltages to power the power amplifier.

Claims

1. An adaptive wide power network amplifier, characterized in that: It includes a power amplifier module and a power supply module for supplying power to the power amplifier module; The power module includes an EMI filter unit, an anti-shock relay unit, an AC rectification and DC conversion unit, a main power filter unit, a control circuit, a high-frequency voltage unit, a high-frequency rectification and filtering unit, and an auxiliary circuit unit. The EMI filter unit, the anti-shock relay unit, the AC rectification and DC conversion unit, the main power filter unit, the high-frequency voltage unit, and the high-frequency rectification and filtering unit are sequentially connected to form a main circuit. The control circuit is arranged between the main power filter unit and the high-frequency voltage unit and controls the voltage input from the main power filter unit to the high-frequency voltage unit. The EMI filter unit is connected to an external AC signal. The high-frequency rectification and filtering unit outputs a DC voltage to power the power amplifier module. The control circuit detects the DC voltage and adjusts the DC voltage output by the main circuit when the output DC voltage is too large. The power amplifier module includes a channel signal input unit, a small signal amplification unit, a gain control adjustment unit, a mode selection unit, a compression and limiting control unit, a signal amplification unit, a low-pass filtering unit and a signal output unit connected in sequence; The channel signal input unit includes two input channels, the small signal amplification unit includes two small signal amplifiers, the gain control adjustment unit includes two gain control adjusters, the compression and limiting control unit includes two compressors, the signal amplification unit includes two groups of signal amplifier components, the low-pass filtering unit includes two low-pass filters, and the signal output unit includes two output channels; One of the input channels is sequentially connected to a small signal amplifier, a gain control regulator, a mode selection unit, a compressor, a signal amplifier component, a low-pass filter, and an output channel; Another input channel is sequentially connected to another small signal amplifier, another gain control regulator, a mode selection unit, another compressor, another signal amplifier component, another low pass filter and another output channel; The signal amplifier assembly comprises a pre-signal amplifier and a signal amplifier arranged at the output end of the pre-signal amplifier; The control circuit includes an error sampling and amplifying unit, an optical coupler and an IC chip. The IC chip integrates a current source clamp, a comparator, an SR trigger, an AND gate, an oscillator unit and a MOSFET tube. The sampling end of the error sampling and amplifying unit is connected to the output end of the high-frequency rectification and filtering unit to sample the output DC voltage. The output end of the error sampling and amplifying unit is connected to the input pin of the IC chip through the optical coupler. The input pin of the IC chip is internally connected to the input end of the current source clamp. The output end of the current source clamp is connected to the reverse input end of the comparator. The output end of the comparator is connected to the reverse input end of the comparator. The R end of the SR trigger is connected, the output end of the SR trigger is connected to the input end of the AND gate, the output end of the AND gate is connected to the gate of the MOS tube, the drain of the MOS tube forms the output pin of the IC chip, the output pin is the control end for controlling the voltage input from the main power filter unit to the high-frequency voltage unit, the source of the MOS tube is connected to the same-direction input end of the comparator, the ground end of the MOS tube forms the ground pin of the IC chip, the VCC pin of the IC chip is powered, the inside of the VCC pin is connected to the input end of the oscillator unit, and the output end of the oscillator unit is respectively connected to the S end of the SR trigger and the input end of the AND gate.

2. The adaptive wide power network amplifier according to claim 1, characterized in that: The power module further comprises an anti-shock relay control unit, and the anti-shock relay control unit is connected to the anti-shock relay unit.

3. The adaptive wide power network amplifier according to claim 1, characterized in that: The auxiliary circuit unit includes a starting circuit and a protection circuit. The input end of the starting circuit is connected to the output end of the anti-shock relay unit. The output end of the starting circuit is respectively connected to the VCC pin of the control circuit and the protection circuit and supplies power to the control circuit and the protection circuit. The protection circuit detects the output DC voltage.

4. The adaptive wide power network amplifier according to claim 1, characterized in that: The power supply module outputs ±5V voltage and ±HIV high voltage. The power supply module provides ±5V voltage for the small signal amplification unit, and the power supply module provides ±HIV high voltage for the signal amplification unit.

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