Intelligent multichannel power amplifier test load switching device

Abstract

The utility model discloses an intelligent multichannel power amplifier test load switching device, which comprises a power supply module, a main control module, a key module, a driving module, a relay array and a resistor array, the power module is connected with an external power supply; the main control module is connected with the power supply module, and a tested power amplifier is connected to the main control module; the key module is connected with the main control module and is used for selecting a resistance value; the relay array is connected with the power supply module and is connected with the main control module through the driving module; the resistor array is connected with the relay array; the main control module can control the relay array to change the combination of the resistor array so as to obtain a resistance value selected by the key module, and the resistance value is used for simulating different powers of the tested power amplifier loudspeaker; through the above structure, the resistor can be automatically switched, and the resistor does not need to be frequently replaced in the midway until the test is completed, thereby saving the test time and improving the test efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of power amplifier testing, in particular to an intelligent multi-channel power amplifier test load switching device. Background Art

[0002] At present, when electronic test engineers test amplifiers, they usually use load resistors to replace speakers to test various indicators. Because the amplifier outputs different powers, different load resistors need to be replaced to match the test. When testing a 9.1-channel amplifier, the load resistors of 10 channels must be replaced, which is very time-consuming. Moreover, the load resistors that have just been tested are very hot and can easily burn people, so they have to wait for them to cool down before replacing them, which wastes time. The intelligent automatic switching resistor device we invented uses relays to automatically switch resistors of different resistance values. There is no need to worry about the load resistors being hot, and the speed is also very fast. It is a very practical tool. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an intelligent multi-channel power amplifier test load switching device.

[0004] An embodiment of the utility model solves the technical problem by adopting a technical solution: an intelligent multi-channel power amplifier test load switching device, comprising a power module, a main control module, a button module, a drive module, a relay array and a resistor array;

[0005] The power module is connected to an external power supply;

[0006] The main control module is connected to the power module, and the power amplifier under test is connected to the main control module;

[0007] The button module is connected to the main control module and is used to select the resistance value;

[0008] The relay array is connected to the power module and is connected to the main control module through the drive module;

[0009] The resistor array is connected to the relay array;

[0010] The main control module can control the relay array to change the combination of the resistor array to obtain the resistance value selected by the key module, which is used to simulate the different powers of the power amplifier speaker under test.

[0011] As one of the preferred embodiments of the utility model, the driving module includes a plurality of transistors, the base of the transistor is connected to the main control module, the collector of the transistor is connected to one end of the relay coil, and the emitter of the transistor is grounded.

[0012] As one of the preferred embodiments of the present utility model, an intelligent multi-channel power amplifier test load switching device further includes a display module connected to the power module and the main control module respectively.

[0013] The beneficial effects of the utility model include: an intelligent multi-channel power amplifier test load switching device, comprising a power module, a main control module, a button module, a drive module, a relay array and a resistor array; the power module is connected to an external power supply; the main control module is connected to the power module, and the power amplifier under test is connected to the main control module; the button module is connected to the main control module for selecting a resistance value; the relay array is connected to the power module and is connected to the main control module through the drive module; the resistor array is connected to the relay array; the main control module can control the relay array to change the combination of the resistor array to obtain the resistance value selected by the button module, which is used to simulate different powers of the power amplifier speaker under test; the resistance can be automatically switched through the above structure, and there is no need to frequently replace the resistance in the middle until the test is completed, thereby saving test time and improving test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 It is a principle block diagram of an intelligent multi-channel power amplifier test load switching device;

[0016] Figure 2 This is the circuit schematic diagram of the power module;

[0017] Figure 3 This is the circuit schematic diagram of the main control module;

[0018] Figure 4 It is the circuit schematic diagram of the display module;

[0019] Figure 5 This is the circuit schematic diagram of the key module;

[0020] Figure 6 The first part of the circuit schematic diagram of the relay array and the driver module;

[0021] Figure 7 This is the schematic diagram of the second part of the circuit of the relay array and the drive module. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0026] Reference Figures 1 to 7 , an intelligent multi-channel power amplifier test load switching device, comprising a power module 10, a main control module 20, a button module 30, a drive module 40, a relay array 50 and a resistor array 60;

[0027] The power module 10 is connected to an external power source;

[0028] The main control module 20 is connected to the power module 10, and the power amplifier under test is connected to the main control module 20;

[0029] The button module 30 is connected to the main control module 20 and is used to select the resistance value;

[0030] The relay array 50 is connected to the power module 10 and is connected to the main control module 20 via the drive module 40;

[0031] The resistor array 60 is connected to the relay array 50;

[0032] The main control module 20 can control the relay array 50 to change the combination of the resistor array 60 to obtain the resistance value selected by the key module 30 for simulating different powers of the power amplifier speaker under test.

[0033] In the utility model, firstly, different resistors are installed on the radiator to form a resistor box, and then connected to the relay switching board with wires. Different resistors form a resistor array 60. The relay array 50 is arranged on the relay switching board, and the relay array 50 is used to switch different resistance values ​​and is connected to the input-output board. The control end of the relay switching board is connected to the MCU control board (main control module 20), and also includes a display module 70 connected to the power module 10 and the main control module 20 respectively. The MCU control board is connected to the display screen (display module 70) and the key board (key module 30), and the input-output board is connected to the front panel, and the front panel is provided with an interface for connecting the power amplifier under test.

[0034] The workflow is as follows:

[0035] The resistance box is placed at the bottom of the test bench without affecting the work surface. The input and output board is connected to the audio analyzer and the junction box. The junction box, the display screen (display module 70), and the keypad (key module 30) are placed on the table, occupying very little area and not affecting the test. For example, when it is necessary to test an 8Ω load resistance, 8Ω is selected through the key module 30, and the display module 70 displays the 8Ω resistance value. After the main control module 20 receives the instruction of the relevant resistance value, it outputs the corresponding port to control the corresponding relay, and then switches the corresponding resistance. At this time, the resistance value on the junction box is the corresponding 8 ohms, engineers only need to connect the power amplifier under test to the junction box for testing; CN29, CN28, CN27, and CN30 are the output control ports of the main control module 20. The drive module 40 includes a number of transistors, the base of the transistor is connected to the main control module 20, the collector of the transistor is connected to one end of the relay coil, and the emitter of the transistor is grounded. The main control module 20 can control the base of the transistor. When there is voltage at the base of the transistor (Q1-Qn), it is turned on, the collector of the transistor is pulled low, and the relay is energized, and resistors of different resistance values ​​can be switched.

[0036] The utility model has the advantages that the resistors can be automatically switched through the structure, and there is no need to frequently change the resistors until the test is completed, thus saving test time and improving test efficiency.

[0037] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An intelligent multi-channel power amplifier test load switching device, characterized in that: It comprises a power module (10), a main control module (20), a key module (30), a drive module (40), a relay array (50) and a resistor array (60); The power module (10) is connected to an external power source; The main control module (20) is connected to the power supply module (10), and the power amplifier under test is connected to the main control module (20); The key module (30) is connected to the main control module (20) and is used to select a resistance value; The relay array (50) is connected to the power module (10) and is connected to the main control module (20) via the drive module (40); The resistor array (60) is connected to the relay array (50); The main control module (20) can control the relay array (50) to change the combination of the resistor array (60) to obtain the resistance value selected by the key module (30) for simulating different powers of the power amplifier speaker under test.

2. The intelligent multi-channel power amplifier test load switching device according to claim 1, characterized in that: The driving module (40) comprises a plurality of triodes, the base of the triode is connected to the main control module (20), the collector of the triode is connected to one end of the relay coil, and the emitter of the triode is grounded.

3. The intelligent multi-channel power amplifier test load switching device according to claim 1, characterized in that: It also includes a display module (70) connected to the power module (10) and the main control module (20) respectively.

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