KR100895776B1 - High power audio amplifier for digitally controlled lcd - Google Patents

Abstract

The present invention relates to a digital integrated control algorithm and control software of a large output power amplifier system capable of reducing the cause of product failure, efficiency of production work, uniformity of quality and reduction of product weight.

To this end, the present invention includes a large output power audio amplifier connected to a switching mode power supply, a gain control unit, a control driver and a sensing unit, respectively; The switching mode power supply is connected to a sensing unit for detecting various types of errors of the amplifier, the control driver and the sensing unit connected to the audio unit is connected to a central processing unit (MCU) to determine the software processing through the input and output buffers, The central processing unit includes a CH1 encoder switch, a CH2 encoder switch, and an LCD (LCD) connected to each other.

Power Amplifiers, Audio Amplifiers, Amplifier Systems, Large Digital Outputs, Switching Mode Power Supplies, LCD, Control Software

Description

High power audio amplifier system with integrated digital control {HIGH POWER AUDIO AMPLIFIER FOR DIGITALLY CONTROLLED LCD}

The present invention integrates the control of the operation and function of the power audio amplifier to implement the control by the central processing unit of the microchip to realize the reduction of the cause of product failure, the efficiency of production work, the uniformity of quality, and the product weight The present invention relates to a digitally controlled integrated LCD (LCD) type large output audio amplifier system.

In general, an acoustic device is composed of an Electromagnetic Compatibility (EMC) filter, a Switching Mode Power Supply (SMPS), an amplifier block, an audio block, and a speaker. That is, when the input AC power is supplied, it is sent to the SMPS through the EMC filter. In the switching mode power supply (SMPS), the input AC power is insulated through the isolation transformer to prevent safety accidents, and the transformer is rectified to DC by appropriately transforming the secondary side. The DC voltage provided by the SMPS is provided to the amplifier block and the audio block, and the amplifier block amplifies the audio signal transmitted from the audio block using the DC voltage as an amplifying voltage source and outputs it to the speaker.

The power provided to the audio block is called an auxiliary power supply in comparison to the amplifier block. For example, the power supply of the microchip is 3.3. DC voltage of ~ 24V is used a lot. On the other hand, the power supplied to the amplifier block is the main power supply, and the power consumed by the amplifier block is larger than the power consumed by the audio block. Thus, in the design and manufacture of the power supply portion of the sound system, it accounts for a significant portion of the total cost of the front end of the amplifier block. In other words, the amplifier block should amplify and output the audio signal. The larger the audio output, the larger the power supply is needed.

On the other hand, in the conventional high output power audio amplifier, the components of the amplifier block are enlarged due to the characteristics of the large output load (speaker) driving, and the control components having various functions by the enlarged components are composed of passive components. Due to these limitations, the weight of a large output power amplifier becomes considerably heavy in proportion to the output, and because of the complicated mechanism configuration and the circuit design applied due to the passive control components, there are problems such as reduced productivity and increased failure rate.

Therefore, in the large output stereo (2 CH) power audio amplifier, there are two variable resistors for controlling the volume, bridge / mono switch, stereo / parallel mode switch, filtering switch, filter frequency selector, operation status indicator, level meter, etc. Various developments have been made to implement the function setting and display by passive components. In addition, conventional analog (mechanical) control power audio amplifiers have a problem in that they have mechanical assembly and circuit complexity.

The present invention has been invented to solve the above-mentioned problems, and is a power audio amplifier that is easy and simple to operate by adding LCD (LCD) display function. The aim is to provide a digitally controlled integrated LCD (LCD) large output audio amplifier system that can significantly reduce usability, improve productivity, reduce system stability, reduce failure rate, and reduce product weight.

Another object of the present invention is to provide a digitally controlled integrated LCD (LCD) type large output audio amplifier system which can be implemented programmatically by software by integrating and digitizing each function and control circuit in a large output professional power audio amplifier. have.

The present invention for achieving the above object is provided with a large output power audio amplifier connected to the switching mode power supply, the gain control unit, the control driver and the sensing unit, respectively; The switching mode power supply is connected to a sensing unit for detecting various types of errors of the amplifier, the control driver and the sensing unit connected to the audio unit is connected to a central processing unit (MCU) to determine the software processing through the input and output buffers, The central processing unit includes a CH1 encoder switch, a CH2 encoder switch, and an LCD (LCD), respectively.

As described above, according to the present invention, the internal circuit and the control device of the audio power amplifier can be digitally structured to stabilize operation, improve performance and reduce the failure rate, simplify the design structure, reduce product weight, and improve productivity. It has an effect.

The digital integrated control algorithm and control software of the large output power amplifier system of the present invention will be described below in detail with reference to the exemplary embodiments.

1 is a block diagram showing a digital control integrated LCD (LCD) type large output audio amplifier system according to an embodiment of the present invention, Figure 2 is a digital control integrated LCD (LCD) type large output audio amplifier system of the present invention. Is a detailed block diagram showing the function control portion of the. The present invention integrates the control of the operation and function of the power audio amplifier 10 to implement the control by the microprocessor central processing unit 20 to reduce the cause of product failure, the efficiency of production work, the uniformity of quality, and the product It is a digital integrated control algorithm and control software that can realize weight reduction.

The finished product according to the present invention is composed of an output terminal, a power input socket, only one operation switch 26 and 28 for each channel, and an LCD (LCD: 30). Will be removed. Therefore, the digital control integrated LCD (LCD) type large output audio amplifier system of the present invention is implemented to be integrated by a control circuit and processed by a software algorithm.

First of all, the basic configuration includes a central processing unit (MCU) 20, CH1 encoder switch 26 and CH2 encoder switch 28 as operation keys for each channel, and the central processing unit 20 together with hardware of the LCD 30 as an indicator. It is configured by the control software inside. The auxiliary configuration may include an input / output buffer 40 that exchanges data with a central processing unit (MCU) 20, a control driver 50 of a function control unit that controls a function based on data, and a detection for detecting and detecting an error. It consists of 60 parts (FAULT DETECTOR).

That is, in the audio unit 12 in the power audio amplifier 10, the switching mode power supply 14, the gain control unit 16, the control driver 50 and the sensing unit 60 are connected to each other. The switching mode power supply 14 is connected to the sensing unit 60. The control driver 50 and the sensing unit 60 connected to the audio unit 12 are connected to the central processing unit 20 through the input / output buffer 40, and the CH1 encoder switch 26 and the CH2 encoder switch of the input / output part ( 28 and the LCD 30 are respectively connected.

The central processing unit 20 is composed of the A / D converter 22 and the flash memory 24 of the EEPROM and can determine by software all the functions implemented in the passive device. By operating the operation keys 26 and 28 of only one channel, it is possible to process the function switching and display commands for the channels CH1 and CH2.

The central processing unit (MCU: 20) handles functions such as volume control, bridge / stereo mode control, filter on / off control, and filter frequency control. FILTER FREQUENCY CONTROL, PARALLEL MODE CONTROL, STATUS LCD DISPLAY, OUT POWER A / D CONVERTING, SAFETY LOCKING FUNCTION, and Mode Memory Backup (MODE MEMORY BACKUP) (FLASH MEMORY).

The input / output buffer BUFFER 40 stabilizes and transmits data between the central processing unit 20 and the power audio amplifier 10. In the power audio amplifier 10, the control driver 50 controls the necessary functions by the command data of the central processing unit 20. 2, the volume 51, the bridge / stereo 52, the filter on / off 53, the 33 Hz / 75 Hz selection 54 and the link on / off 55 are connected, respectively.

The detector 60 detects an error of the power audio amplifier 10 and transmits data to the central processing unit 20. As shown in FIG. 2, an AC fault detection (AC FAULT DETECT: 61), a DC fault detection (DC FAULT DETECT: 62), an offset error detection (OFF SET ERR DETECT: 63), and a switching mode power supply (SMPS) ) OVER LOAD DETECT (64), output overload detection (65) and temperature sensor (66) for over temperature detection are respectively connected.

As described above, the present invention implements the control by the central processing unit 20 of the microchip by integrating the control of the operation and function of the power audio amplifier 10, thereby reducing the cause of product failure, efficiency of production work, and quality. Uniformization and reduction of product weight can be realized. In addition, each function and control circuit is integrated and digitally controlled in a large output professional power audio amplifier for software program implementation.

3 is a flowchart of the control software of the digital control integrated LCD (LCD) type large output audio amplifier system of the present invention, showing a programming chart of software for programmatically implementing the control function integration of the present invention.

The present invention provides a parallel mode, a bridge / stereo mode, a wheel adjusting mode, a function setting mode, a display setting and a unlocking mode, a mode (menu) locking, and a program version. And LCD inspection mode. In all of the above function settings, limiter on / off (CH1, CH2), filter on / off (CH1, CH2), filter cutoff frequency control (33Hz / 75Hz, CH1, CH2), parallel mode (main), bridge / Stereo mode, volume locking set (CH1, CH2) and menu locking set (CH1, CH2).

Therefore, the operation mode of the present invention is digitally controlled by a program and each of the following modes can be selected. First, the power switch on goes to the initial mode after START 'is displayed for 2 seconds on the LCD. READY 'is displayed on the LCD, and device initialization, volume soft-up, and mode control are performed.

According to the three modes of running mode, the next letter scrolls from right to left on the LCD. That is, the stereo mode is STEREO MOdE, the parallel mode is PARALLEL MOdE, and the bridge / mono mode is BR-MONO MOdE.

The stereo mode operates independently according to each input signal. The STEREO MOdE letters are scrolled in sequence. In the parallel mode, one or two channels operate identically at the input of CH1. Each mode can be set for each channel. The letters 'PARALLEL MOdE' are scrolled in sequence. Bridge / mono mode operates in bridge mode depending on the input of CH1. The letters 'BR-MONO MOdE' scroll in order.

In the volume control mode, when the knob of each channel is pressed during operation, the volume control mode of the volume control mode is displayed while the volume control mode of the channel is displayed. If you turn the knob to the left, it will go down and if you turn it to the right, it will be UP. Here, the volume setting can be adjusted from 0 to 30.

In the function setting mode, 'ModSET' is displayed when the knob of the corresponding channel is pressed twice. In this mode, each function can be set according to the order of pressing. Here, the mode execution according to the number of buttons is 1: Volume Control, 2: Mode Set, 3: Limit Control, 4: Filter Control, 5: Filter frequency Select, 6: Y Mode Select, 7: Volume Lock, 8: Mode ( Menu) Lock. 9: Main Mode Return.

The LIMIT ON / OFF operates independently for each channel, and sets the output of the channel not to be clipped. The filter on / off operates independently for each channel and turns on / off the filter function (LOW CUT). The FILTER CUT OFF FREQUENCY CONTROL operates independently for each channel and selects the low cut frequency of the filter function from 33 Hz / 75 Hz.

The PARALLEL MODE operates simultaneously regardless of channel, and this mode connects the input signal of CH 1 to CH 2 in parallel. That is, the input signal of CH 1 is internally connected to CH 2. When this function is turned on, the letters 'PARALLEL MOdE' are scrolled in order on the main screen, and when this function is turned off, the STEREO MOdE letters are scrolled in sequence.

The BRIDGE / MONO MODE operates simultaneously regardless of channel, and operates CH 1 and CH 2 in BRIDGE / MONO mode. When this function is turned on, the letters 'BR-MONO MOdE' are scrolled in sequence on the main screen. With the input of CH 1, CH 1 and CH2 operate in bridge mode. The setting of the detailed functions is automatically synchronized with CH 2 to the CH 1 setting. The CH 1 and CH 2 icons are turned off and the BRIDGE icons are turned on. In this mode, the volume of CH 2 is set to be inoperable. If you try to adjust the volume of CH 2 in this mode, you will see 'NO-CTRL'.

The VOLUME LOCKING SET operates independently for each channel. It is a lock function to prevent any operation after setting the required volume. The MENU LOCKING SET operates simultaneously regardless of the channel. It is prohibited to enter the mode to prevent the mode change after installation.

In the display and release mode when setting the lock function, when the knob of the channel is pressed for volume control, the currently set volume value is displayed during VOLUME LOCKING. When you turn left or right to adjust, 'SAFTY!' Is displayed and no adjustment is made. At this time, release of volume control lock mode can be released by each channel in MODE SET 6 item VOLUME LOCKING SET.

In the mode lock mode, if mode lock is set, CH 1 and CH 2 are applied equally, and if you try to enter MODE SET by pressing the knob of the channel twice, 'ModLOC' is displayed and the mode stops.

The mode lock is released in the following order. Press the knob of CH 1 twice so that 'ModLOC' is displayed. If you press the CH 2 knob for more than 3 seconds, 'Un-LOC' is displayed on the screen and the lock function is released. In all setting modes, if there is no input for 4 seconds, it automatically returns to main mode.

When exiting the setting mode and returning to the main mode, after displaying VASCOM 'for 1 second, the main mode status is displayed by scrolling.

Program version and LCD test mode are to check the current program version and check the LCD icon for abnormality. While pressing the knob on CH 1 side, turn the power switch on (hold it for about 3 seconds or more). All icons on the LCD light up and the 'VER XXX' indicator appears.

The present invention operated as described above is a digital control integrated LCD (LCD) type large output audio amplifier system that is easy and simple to operate by adding an LCD (LCD) display function, the mechanical assembly of the conventional analog (mechanical) control power audio amplifier In addition, the circuit complexity can be drastically reduced, so that convenience of usability, productivity improvement, system stability, failure rate and product weight can be reduced.

Digital control integrated LCD (LCD) type high output audio amplifier system of the present invention can be used in various ways without departing from the technical spirit of the present invention for those skilled in the art of application of the present invention. Substitutions, modifications, and changes are possible, and are not limited to the above-described embodiments and the accompanying drawings.

1 is a block diagram showing a digital control integrated LCD (LCD) type large output audio amplifier system according to an embodiment of the present invention;

2 is a detailed block diagram showing a function control unit of a digital control integrated LCD (LCD) type large output audio amplifier system according to the present invention;

3 is a flowchart of control software for implementing the functions of the digitally controlled integrated LCD (LCD) type large output audio amplifier system of the present invention.

* Explanation of symbols for the main parts of the drawings

10: power audio amplifier

20: central processing unit (MCU)

30: LCD

40: buffer

50: control driver

60: detector

Claims (4)

A high output power audio amplifier having a switching mode power supply, a gain control unit, a control driver, and a sensing unit connected to the audio unit, respectively; The switching mode power supply is connected to a sensing unit for detecting various errors of the amplifier, the control driver and the sensing unit connected to the audio unit is connected to a central processing unit (MCU) to determine the software processing through the input and output buffer, this central The processing unit includes a CH1 encoder switch, a CH2 encoder switch, and an LCD (LCD) are connected to each other, the digital control integrated LCD (LCD) type large output audio amplifier system. delete The method of claim 1, The control driver controls the necessary functions according to the command data of the central processing unit, and the volume control, the bridge / stereo, the filter on / off, the 33Hz / 75Hz selection and the link on / off are connected to each other. ) Large output audio amplifier system. The method of claim 1, The detection unit detects an error of a power audio amplifier and sends data to the central processing unit, AC fault detection, DC fault detection, offset error detection, switching mode power supply (SMPS) overload detection, output overload detection and over temperature Digital control integrated LCD (LCD) type large output audio amplifier system, characterized in that the temperature sensor for detection is connected to each other.

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