CN202998468U

CN202998468U - Power test system of loudspeaker

Info

Publication number: CN202998468U
Application number: CN 201220396458
Authority: CN
Inventors: 蒋加星
Original assignee: Wuxi Jiefu Electroacoustic Co Ltd
Current assignee: Wuxi Jiefu Electroacoustic Co Ltd
Priority date: 2012-08-11
Filing date: 2012-08-11
Publication date: 2013-06-12
Anticipated expiration: 2022-08-11

Abstract

The utility model relates to a power test system of a loudspeaker. The power test system of the loudspeaker mainly comprises a main control computer and a power amplifier. A test software used for testing, a USB interface and a signal generating processing module are arranged in the main control computer, and the main control computer is communicated with a power tester via the USB interface, and can output a needed test program control signal via the signal generating processing module; the signal generating processing module transmits the generated test program control signal in the power tester, and the main control computer controls the selection and distribution of the power tester to the test program control signal via the USB communication, so that the selected test program control signal is distributed to the corresponding power amplifier; and the power amplifier drives a to-be-tested loudspeaker according to the test program control signal. The power test system of the loudspeaker of the utility model is compact in structure, high in test accuracy, wide in application range, convenient in operation and low in usage cost, enables the detection efficiency to be improved, and is safe and reliable.

Description

The power test system of loud speaker

Technical field

The utility model relates to a kind of test macro, and especially a kind of power test system of loud speaker specifically is applicable to each mensuration to index of loud speaker under various experiment types and the state that works long hours, belongs to the technical field that loud speaker is measured.

Background technology

According to the world and national Specification, must carry out power test when carrying out loud speaker typing check and routine inspection.Electroacoustic enterprise is in research and development and producing the process of speaker product, when doing last product quality for the loud speaker before dispatching from the factory, need the some samples that extract are carried out the power test test, if have defective situation, this batch products all can be regarded as substandard product, this shows that power test is important and can not ignore a test link.And China is the first in the world electroacoustic big country, and electro-acoustic element output surpassed 7,600,000,000 in 2007, accounted for 60% of global total output, more can embody thus the importance of power test.Although the relevant tester of many moneys has been arranged at home, it is less that some instrument is measured number of channels simultaneously, and the test signal kind is single, is difficult to accomplish comprehensively high efficiency test loudspeaker.Some instrument does not possess the network monitor function and carries out Long-distance Control, has weakened greatly the operability of equipment, fail safe, and operating efficiency.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of power test system of loud speaker is provided, and its compact conformation improves detection efficiency, and measuring accuracy is high, and wide accommodation is easy to operate, and use cost is low, and is safe and reliable.

According to the technical scheme that the utility model provides, the power test system of described loud speaker comprises main control computer and the power amplifier that is used for driving loud speaker to be measured; Main control computer is connected with power amplifier by power measuring, and power amplifier is connected with the output of power measuring, comprises in main control computer that testing software, USB interface and the signal for test produces processing module; Main control computer carries out communication by USB interface and power measuring, main control computer can produce the required test program control signal of processing module output by signal, in the test program control signal through-put power tester that signal generation processing module will produce, main control computer is by selection and the distribution of USB Communication Control power measuring to the test program control signal, so that the test program control signal of selecting is assigned in corresponding power amplifier, power amplifier drives loud speaker to be measured according to the test program control signal; The status signal of power measuring during to speaker operation to be measured sampled, and the signal that is transferred in main control computer produces processing module, signal produces processing module and coordinates the status signal with speaker operation the time with testing software and test program control signal and analyze comparison, to judge and to export the operating state of loud speaker and the running status of whole test macro.

Described power measuring comprises MCU control and USB communicating circuit, signal source selection distributor circuit, signal sample circuit and is used to power measuring that the power circuit of working power is provided; Power measuring utilizes MCU to control and the USB communicating circuit is connected with main control computer by the USB mode, signal source selects the control end of distributor circuit to control with MCU and the USB communicating circuit is connected, signal source selects the input of distributor circuit to be connected with signal generation processing module, signal source selects the output of distributor circuit to be connected with power amplifier, the status signal of signal sample circuit during to speaker operation to be measured sampled, and status signal is input to signal produces processing module.

Described main control computer is connected with the remote monitoring computer by Ethernet, and the remote monitoring computer is monitored the operating state of loud speaker to be measured and the running status of whole test macro by Ethernet.

Described signal produces the processing module output action can carry out required maximum noise power test, long-term maximum power test, the test of short-term maximum power, specified maximum sinusoidal power test, optimal power nominal test, white noise signal test or pink noise test in the test program control signal of loud speaker to be measured.

Described MCU controls and the USB communicating circuit is connected with main control computer by the USB buffer circuit.

Described power circuit comprises the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit;

Described the first voltage follower circuit comprises the first transformer, the centre cap ground connection of described the first transformer secondary winding, the two ends of the first transformer secondary winding are connected with the first rectifier bridge, one output of the first rectifier bridge is connected with the IN of the first pressurizer end, and another output of the first rectifier bridge is connected with the IN of the second pressurizer end; The IN end of the first pressurizer is connected with the cathode terminal of the first diode, and by the 59 capacity earth; The anode tap of the first diode is connected with the OUT end of the first pressurizer; The OUT end of the first pressurizer also is connected with the cathode terminal of the second diode, and the anode tap of the second diode is connected with the ADJ end of the first pressurizer, and the two ends of the second diode are parallel with the 53 resistance; The ADJ end of the first pressurizer is also by the 54 grounding through resistance, and the two ends of the 54 resistance are parallel with the 65 electric capacity and the 67 electric capacity; The two ends of the 59 electric capacity are parallel with the 58 electric capacity; The OUT end of the first pressurizer is also by the 60 capacity earth, and the two ends of the 60 electric capacity are parallel with the 61 electric capacity; The OUT end output+12V voltage of the first pressurizer;

The IN end of the second pressurizer is by the 73 capacity earth, and the two ends of described the 73 electric capacity are parallel with the 71 electric capacity; The OUT of the second pressurizer end respectively with an end of the 56 resistance, an end of the 72 electric capacity, the cathode terminal of the anode tap of the 4th diode and the 5th diode is connected, the anode tap of the 5th diode is connected with the IN end of the second pressurizer, the cathode terminal of the 4th diode is connected with the ADJ end of the second pressurizer, the other end ground connection of the 72 electric capacity, the other end of the 56 resistance is connected with the ADJ end of the second pressurizer; The two ends of the 72 electric capacity are parallel with the 70 electric capacity; The ADJ end of the second pressurizer is by the 55 grounding through resistance, and the two ends of described the 55 resistance are parallel with the 66 electric capacity and the 67 electric capacity; The OUT end output-12V voltage of the second pressurizer;

The second voltage output circuit comprises the second transformer, the centre cap ground connection of described the second transformer secondary winding, the two ends of the second transformer secondary winding are connected with the second rectifier bridge, one end of the second rectifier bridge is connected with the IN of the 3rd pressurizer end, and the other end of the second rectifier bridge is connected with the IN end of the 4th pressurizer; The IN end of the 3rd pressurizer also passes through the 78 capacity earth, and is connected with the cathode terminal of the 6th diode, and the anode tap of the 6th diode is connected with the OUT end of the 3rd pressurizer, and the two ends of the 78 electric capacity are parallel with the 76 electric capacity; The OUT end of the 3rd pressurizer also is connected with an end of the 7th diode and the 77 electric capacity, the other end ground connection of the 77 electric capacity, and the anode tap of the 7th diode is connected with the ADJ end of the 3rd pressurizer; The two ends of the 7th diode are parallel with the 57 resistance; The two ends of the 77 electric capacity are parallel with the 76 electric capacity; The ADJ end of the 3rd pressurizer is by the 58 grounding through resistance, and the two ends of the 58 resistance are parallel with the 81 electric capacity and the 80 electric capacity; The OUT end output+5V voltage of the 3rd pressurizer;

The IN end of the 4th pressurizer is by the 87 capacity earth, and the two ends of described the 87 electric capacity are parallel with the 86 electric capacity; The GND end ground connection of the 4th pressurizer, the OUT end of the 4th pressurizer is by the 84 capacity earth, and the two ends of described the 84 electric capacity are parallel with the 85 electric capacity; The OUT end output-5V voltage of the 4th pressurizer;

The tertiary voltage output circuit comprises the 5th pressurizer, the IN of described the 5th pressurizer end is connected with+5V voltage, and the IN of the 5th pressurizer end is by the first capacity earth, the two ends of described the first electric capacity are parallel with the second electric capacity, the GND end ground connection of the 5th pressurizer, two outputs of the 5th pressurizer are all by the 3rd capacity earth, the two ends of the 3rd electric capacity are parallel with respectively the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity and the 8th electric capacity, the output output 3.3V voltage of the 5th pressurizer.

Described signal source selects distributor circuit to comprise the first operational amplifier, and the output of described the first operational amplifier is connected by an end of the 9th resistance and an end of the 11 resistance; The other end of the 9th resistance is connected with the end of oppisite phase of the first operational amplifier, the other end ground connection of the 11 resistance; The cathode power supply end of the first operational amplifier is connected with+12V voltage, and by the 20 capacity earth, and the negative electricity source of the first operational amplifier is connected, and passes through the 21 capacity earth with-12V voltage; The in-phase end of the first operational amplifier is by the 12 grounding through resistance, and the in-phase end of the first operational amplifier is connected with the output that the test program control signal of exporting for reception signal generation processing module and MCU control the first switching circuit of the control signal of exporting with the USB communicating circuit; The end of oppisite phase of the first operational amplifier is connected with the moving contact of the first relay, and the first fixed contact of the first relay is connected with the output of the first operational amplifier, and the second fixed contact of the first relay is by the tenth grounding through resistance; One end of the first relay coil is connected with+5V voltage, and the other end is connected with the output of relay driver.

Described signal sample circuit comprises the 6th relay, and an end of described the 6th relay coil is connected with+5V voltage, and the other end is connected with relay driver; The first moving contact energy gating of the 6th relay connects the first fixed contact, second fixed contact of the 6th relay; The second moving contact energy gating of the 6th relay connects the 3rd fixed contact, the 4th fixed contact of the 6th relay; Described the first fixed contact is connected with the second fixed contact by the 34 resistance, and by the 36 grounding through resistance; The second fixed contact is connected with an end of the 37 electric capacity and an end of the 39 electric capacity by the 32 resistance, the other end ground connection of described the 39 electric capacity, and the other end of the 37 electric capacity is connected with sampling end GFout1-; The 3rd fixed contact passes through the 30 grounding through resistance, and is connected with the 4th fixed contact by the 27 resistance; The 4th fixed contact is connected with an end of the 32 electric capacity and an end of the 35 electric capacity by the 25 resistance, the other end ground connection of the 35 electric capacity, and the other end of the 32 electric capacity is connected with sampling end GFout1+; The first moving contact and the second moving contact all are connected with the input of the 3rd multiplexed gate; The GND end ground connection of the 3rd multiplexed gate, the output of the 3rd multiplexed gate is connected with the input of the second gain amplifier; The OUT end of the second gain amplifier and the FB of the second gain amplifier hold and interconnect, and the OUT of the second gain amplifier end passes through the 51 resistance and the rear ground connection of the second adjustable resistance serial connection, the adjustable end formation sampling output SRout of the second adjustable resistance;

Also comprise the first multiplexed gate and the second multiplexed gate; The input of the first multiplexed gate, the second multiplexed gate is connected by the reference data module, and respectively by the first common ground module, the second common ground module ground connection; The output of the first multiplexed gate, the second multiplexed gate is connected with the first gain amplifier, the OUT end of described the first gain amplifier interconnects with the FB end of the first gain amplifier, and the OUT of the first gain amplifier end is by the 49 resistance and the rear ground connection of the first adjustable resistance serial connection, and the adjustable end of the first adjustable resistance forms sampling output SLout.

Advantage of the present utility model:

1, the utility model utilizes computer to produce the required various signals of power of loudspeaker test, utilize the operating state of computer software Real-Time Monitoring, real-time analysis device under test, in order to make corresponding prompting, and testing crew can be understood by remote monitoring the real-time status of test.

2, the utility model can carry out maximum noise power experiment, long-term maximum power experiment, the experiment of short-term maximum power, the experiment of specified maximum sinusoidal power, optimal power nominal experiment and user can be self-defined etc. the kinds of experiments kind;

3, the utility model can utilize the multi-signals such as white noise signal, pink noise signal, simulated programmer signal, the outer signal that also can adopt the user to provide for oneself, thus satisfy user's specific demand; Also can carry out simultaneously the power experiment of multichannel unlike signal type.

4, the utility model testing crew can carry out remote monitoring to test by the remote monitoring computer, thereby has protected the hearing of testing crew; But automatic shutoff signal after running into loud speaker damage in test process stops experiment, avoid damaging power amplifier, and real-time monitoring system can be informed information testing crew accurately, accomplishes real-time manual control;

5, the utility model is in test process, can judge by the real-time operating state to test macro of the monitoring of software in main control computer, can be by the testing software objective interface find out the USB connection status, can find out intuitively by the status bar of testing software the operating state of current loud speaker, detecting information that can be by observation test software judges the operating state of power amplifier.

6, the man-machine interface of the utility model device software system is friendly, and the user is easy to operate; Propagable scope is the enterprise relevant with loud speaker, sound equipment, home theater, TV, broadcasting, automobile audio, computer media, mobile phone, telephone set, radio-cassette player, electronic toy etc., electroacoustic enterprise, quality supervision and test departments, relevant school, R﹠D institution etc.

Description of drawings

Fig. 1 is structured flowchart of the present utility model.

Fig. 2 is the schematic diagram of MCU control section in the utility model MCU control and USB communicating circuit.

Fig. 3 is the schematic diagram of the utility model USB buffer circuit.

Fig. 4 is the schematic diagram of the utility model relay driver.

Fig. 5 is the circuit theory diagrams that the utility model signal source is selected the first selection distribution passage in distributor circuit.

Fig. 6 is the circuit theory diagrams that the utility model signal source is selected the second selection distribution passage in distributor circuit.

Fig. 7 is the circuit theory diagrams that the utility model signal source is selected the 3rd selection distribution passage in distributor circuit.

Fig. 8 is the circuit theory diagrams that the utility model signal source is selected the 4th selection distribution passage in distributor circuit.

Fig. 9 is the schematic diagram of the first sampling reduction voltage circuit in the utility model signal sample circuit.

Figure 10 is the schematic diagram of the second sampling reduction voltage circuit in the utility model signal sample circuit.

Figure 11 is the schematic diagram of the 3rd sampling reduction voltage circuit in the utility model signal sample circuit.

Figure 12 is the schematic diagram of the 4th sampling reduction voltage circuit in the utility model signal sample circuit.

Figure 13 forms the circuit diagram of sampling output SLout by the reference data module in the utility model signal sample circuit.

Figure 14 is by forming the circuit diagram of sampling output SRout after above-mentioned sampling reduction voltage circuit is processed in the utility model signal sample circuit.

Figure 15 is the schematic diagram of the first voltage follower circuit in the utility model power circuit.

Figure 16 is the schematic diagram of second voltage output circuit in the utility model power circuit.

Figure 17 is the schematic diagram of tertiary voltage output circuit in the utility model power circuit.

Embodiment

The utility model is described in further detail below in conjunction with concrete drawings and Examples.

As shown in Figure 1: in order to realize that power of loudspeaker is carried out required test, the utility model comprises main control computer and the power amplifier that is used for driving loud speaker to be measured; Main control computer is connected with power amplifier by power measuring, and power amplifier is connected with the output of power measuring, comprises in main control computer that testing software, USB interface and the signal for test produces processing module; Main control computer carries out communication by USB interface and power measuring, main control computer can produce the required test program control signal of processing module output by signal, in the test program control signal through-put power tester that signal generation processing module will produce, main control computer is by selection and the distribution of USB Communication Control power measuring to the test program control signal, so that the test program control signal of selecting is assigned in corresponding power amplifier, power amplifier drives loud speaker to be measured according to the test program control signal; The status signal of power measuring during to speaker operation to be measured sampled, and the signal that is transferred in main control computer produces processing module, signal produces processing module and coordinates the status signal with speaker operation the time with testing software and test program control signal and analyze comparison, to judge and to export the operating state of loud speaker and the running status of whole test macro.

Described main control computer is connected with the remote monitoring computer by Ethernet, and the remote monitoring computer is monitored the operating state of loud speaker to be measured and the running status of whole test macro by Ethernet.Can realize long-range detection by the remote monitoring computer, monitor convenient and reliable.

Described power measuring comprises MCU control and USB communicating circuit, signal source selection distributor circuit, signal sample circuit and is used to power measuring that the power circuit of working power is provided; Power measuring utilizes MCU to control and the USB communicating circuit is connected with main control computer by the USB mode, signal source selects the control end of distributor circuit to control with MCU and the USB communicating circuit is connected, signal source selects the input of distributor circuit to be connected with signal generation processing module, signal source selects the output of distributor circuit to be connected with power amplifier, the status signal of signal sample circuit during to speaker operation to be measured sampled, and status signal is input to signal produces processing module.Signal source is selected to produce except receiving signal the test program control signal that processing module produces with distributor circuit, can also accept the test signal of outside input, in order to carry out required signal or functional test.

Described MCU controls and the USB communicating circuit is connected with main control computer by the USB buffer circuit; USB interface between the utility model main control computer and power measuring can be the interface of USB2.0 or other versions, by adopting the USB buffer circuit, can make power measuring work freely in the powerful industrial environment of interference source, it is the chip of ADum4160 that the USB buffer circuit adopts TI company model.

Described signal produces the processing module output action can carry out required maximum noise power test, long-term maximum power test, the test of short-term maximum power, specified maximum sinusoidal power test, optimal power nominal test, white noise signal test or pink noise test in the test program control signal of loud speaker to be measured.Wherein:

Maximum noise power experiment refers to that loud speaker inputs the simulated programmer signal of a regulation in rated frequency range, and loud speaker does not produce the maximum noise power experiment of permanent cause thermal damage and mechanical failure, in the utility model by the User Defined duration of experiment, set experiment maximum power and the rated impedance of loud speaker, selector channel number, and the connected mode of loud speaker to be measured.

Long-term maximum noise power experiment refers to that loud speaker inputs the simulated programmer signal of a regulation in rated frequency range, be 1 minute signal duration, be spaced apart 2 minutes, repeat 10 times, loud speaker does not produce the maximal input of permanent cause thermal damage and mechanical failure, and the user need to arrange experiment power and the rated impedance of loud speaker.

Short-term maximum noise power experiment refers to that loud speaker inputs the simulated programmer signal of a regulation in rated frequency range, be 1 second signal duration, be spaced apart 1 minute, repeat 60 times, loud speaker does not produce the maximum noise power of permanent cause thermal damage and mechanical failure, and the user need to arrange experiment power and the rated impedance of loud speaker

Specified maximum sinusoidal power experiment refers to that the noise signal of inputting is sinusoidal signal, set the duration of experiment as the user after, continual sinusoidal signal of giving a regulation of loud speaker two ends input, loud speaker does not produce the specified maximum sinusoidal power of cause thermal damage and mechanical failure.By the User Defined duration of experiment, set experiment power and the rated impedance of loud speaker, selector channel number, and the connected mode of loud speaker to be measured in the utility model.

The User Defined experiment is after showing the experimental signal of a regulation of input in the rated frequency range of loudspeaker, by the duration of User Defined experiment, interval time and number of repetition, loud speaker does not produce the maximum noise power of permanent cause thermal damage and mechanical failure during this period.In the utility model, need the User Defined duration of experiment, test interval time, experiment number of repetition, loud speaker experiment power and rated impedance, selector channel number, and the connected mode of loud speaker to be measured.

The utility model can also utilize the multi-signals such as white noise signal, pink noise signal, simulated programmer signal, the outer signal that also can adopt the user to provide for oneself, thus satisfy user's specific demand; Also can carry out simultaneously the power experiment of multichannel unlike signal type.

As Fig. 1 and Figure 15, Figure 16 and shown in Figure 17: be the circuit theory diagrams of power circuit in the utility model power measuring, wherein, described power circuit comprises the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit;

described the first voltage follower circuit comprises the first transformer T1, the centre cap ground connection of described the first transformer T1 secondary winding, the two ends of the first transformer T1 secondary winding are connected with the first rectifier bridge, one output of the first rectifier bridge is connected with the IN end of the first pressurizer U9, and another output of the first rectifier bridge is connected with the IN end of the second pressurizer U10, the first rectifier bridge comprises the 9th diode D9, the tenth diode D10, the 11 diode D11 and the 12 diode D12, the cathode terminal of described the 9th diode D9 is connected with the cathode terminal of the 12 diode D12, the anode tap of the 9th diode D9 is connected with the cathode terminal of the tenth diode D10, the anode tap of the tenth diode D10 is connected with the anode tap of the 11 diode D11, the cathode terminal of the 11 diode D11 is connected with the anode tap of the 12 diode D12, above-mentioned the 9th diode D9, the tenth diode D10, the 11 diode D11 and the 12 diode D12 form rectifier bridge after above-mentioned connection.In order to reduce ripple coefficient, improve the stability of the first voltage follower circuit output voltage, in the utility model, the two ends of the 9th diode D9 are parallel with the 63 capacitor C 63, the two ends of the tenth diode D10 are parallel with the 68 capacitor C 68, the two ends that the two ends of the 11 diode D11 are parallel with the 69 capacitor C 69, the 12 diode D12 are parallel with the 62 capacitor C 62.In the utility model, an end of the first transformer T1 secondary winding is connected with the anode tap of the 9th diode D9, and the other end of the first transformer T1 secondary winding is connected with the cathode terminal of the 11 diode D11 and the anode tap of the 12 diode D12.The cathode terminal of the cathode terminal of the 12 diode D12 and the 9th diode D9 is connected with the IN end of the first pressurizer U9, and the first pressurizer U9 adopts the chip of LM317; The anode tap of the tenth diode D10 and the anode tap of the 11 diode D11 are connected with the IN end of the second pressurizer U10, and the second pressurizer U10 adopts the chip of LM337.

The IN end of the first pressurizer U9 is connected with the cathode terminal of the first diode D1, and by the 59 capacitor C 59 ground connection; The anode tap of the first diode D1 is connected with the OUT end of the first pressurizer U9; The OUT end of the first pressurizer U9 also is connected with the cathode terminal of the second diode D2, and the anode tap of the second diode D2 is connected with the ADJ end of the first pressurizer U9, and the two ends of the second diode D2 are parallel with the 53 resistance R 53; The ADJ end of the first pressurizer U9 is also by the 54 resistance R 54 ground connection, and the two ends of the 54 resistance R 54 are parallel with the 65 capacitor C 65 and the 67 capacitor C 67; The two ends of the 59 capacitor C 59 are parallel with the 58 capacitor C 58; The OUT end of the first pressurizer U9 is also by the 60 capacitor C 60 ground connection, and the two ends of the 60 capacitor C 60 are parallel with the 61 capacitor C 61; The OUT end output+12V voltage of the first pressurizer U9;

The IN end of the second pressurizer U10 is by the 73 capacitor C 73 ground connection, and the two ends of described the 73 capacitor C 73 are parallel with the 71 capacitor C 71; The OUT of the second pressurizer U10 end respectively with an end of the 56 resistance R 56, an end of the 72 capacitor C 72, the cathode terminal of the anode tap of the 4th diode D4 and the 5th diode D5 is connected, the anode tap of the 5th diode D5 is connected with the IN end of the second pressurizer U10, the cathode terminal of the 4th diode D4 is connected with the ADJ end of the second pressurizer U10, the other end ground connection of the 72 capacitor C 72, the other end of the 56 resistance R 56 is connected with the ADJ end of the second pressurizer U10; The two ends of the 72 capacitor C 72 are parallel with the 70 capacitor C 70; The ADJ end of the second pressurizer U10 is by the 55 resistance R 55 ground connection, and the two ends of described the 55 resistance R 55 are parallel with the 66 capacitor C 66 and the 67 capacitor C 67; The OUT end output-12V voltage of the second pressurizer U10;

The second voltage output circuit comprises the second transformer T2, the centre cap ground connection of described the second transformer T2 secondary winding, the two ends of the second transformer T2 secondary winding are connected with the second rectifier bridge, one end of the second rectifier bridge is connected with the IN end of the 3rd pressurizer U11, and the other end of the second rectifier bridge is connected with the IN end of the 4th pressurizer U12;

The second rectifier bridge comprises the 13 diode D13, the 14 diode D14, the 15 diode D15 and the 16 diode D16, the cathode terminal of the 13 diode D13 is connected with the cathode terminal of the 16 diode D16, the anode tap of the 13 diode D13 is connected with the cathode terminal of the 14 diode D14, the anode tap of the 14 diode D14 is connected with the anode tap of the 15 diode D15, and the cathode terminal of the 15 diode D15 is connected with the anode tap of the 16 diode D16.The two ends of the 13 diode D13 are parallel with the 75 capacitor C 75, the two ends of the 14 diode D14 are parallel with the 82 capacitor C 82, the two ends that the two ends of the 15 diode D15 are parallel with the 83 capacitor C 83, the 16 diode D16 are parallel with the 74 capacitor C 74.One end of the second transformer T2 secondary winding is connected with the anode tap of the 13 diode D13 and the cathode terminal of the 14 diode D14, and the other end of the second transformer T2 secondary winding is connected with the anode tap of the 16 diode D16 and the cathode terminal of the 15 diode D15.The cathode terminal of the 13 diode D13 and the cathode terminal of the 16 diode D16 all are connected with the IN end of the 3rd pressurizer U11, and the anode tap of the 14 diode D14 and the anode tap of the 15 diode D15 all are connected with the IN end of the 4th pressurizer U12.The 3rd pressurizer U11 adopts the chip of LM317, and the 4th pressurizer U12 adopts 7905 chip.

The IN end of the 3rd pressurizer U11 is also by the 78 capacitor C 78 ground connection, and be connected with the cathode terminal of the 6th diode D6, the anode tap of the 6th diode D6 is connected with the OUT end of the 3rd pressurizer U11, and the two ends of the 78 capacitor C 78 are parallel with the 76 capacitor C 76; The OUT end of the 3rd pressurizer U11 also is connected with an end of the 7th diode D7 and the 77 capacitor C 77, the other end ground connection of the 77 capacitor C 77, and the anode tap of the 7th diode D7 is connected with the ADJ end of the 3rd pressurizer U11; The two ends of the 7th diode D7 are parallel with the 57 resistance R 57; The two ends of the 77 capacitor C 77 are parallel with the 76 capacitor C 79; The ADJ end of the 3rd pressurizer U11 is by the 58 resistance R 58 ground connection, and the two ends of the 58 resistance R 58 are parallel with the 81 capacitor C 81 and the 80 capacitor C 80; The OUT end output+5V voltage of the 3rd pressurizer U11;

The IN end of the 4th pressurizer U12 is by the 87 capacitor C 87 ground connection, and the two ends of described the 87 capacitor C 87 are parallel with the 86 capacitor C 86; The GND end ground connection of the 4th pressurizer U12, the OUT end of the 4th pressurizer U12 is by the 84 capacitor C 84 ground connection, and the two ends of described the 84 capacitor C 84 are parallel with the 85 capacitor C 85; The OUT end output-5V voltage of the 4th pressurizer U12;

The tertiary voltage output circuit comprises the 5th pressurizer U1, the IN of described the 5th pressurizer U1 end is connected with+5V voltage, and the IN of the 5th pressurizer U1 end is by the first capacitor C 1 ground connection, the two ends of described the first capacitor C 1 are parallel with the second capacitor C 2, the GND end ground connection of the 5th pressurizer U1, two outputs of the 5th pressurizer U1 are all by the 3rd capacitor C 3 ground connection, the two ends of the 3rd capacitor C 3 are parallel with respectively the output output 3.3V voltage of the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7 and the 8th capacitor C 8, the five pressurizer U1.The 5th pressurizer U1 adopts the chip of REG117-3.3, the 5th pressurizer U1+5V voltage can by the output of second voltage output circuit+5V voltage provides.By the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit in the utility model power circuit, provide the required operating voltage of remaining circuit part in power measuring.

As Fig. 2, Fig. 3 and shown in Figure 4: be that the utility model MCU controls the circuit theory diagrams with the USB communicating circuit; In Fig. 2, MCU control chip U2 adopts the chip of STM32R8T6, MCU control chip U2 carries out the signal transmission by USB communication module and the main control computer that carries, and according to the control signal that main control computer is exported, signal source is selected and distributed by MCU control chip U2.The USB communicating circuit comprises the buffer circuit that adopts ADum4160, and MCU control chip U2 is connected with the USB interface of main control computer by buffer circuit, realizes the USB communication with main control computer.MUC controls with the USB communicating circuit and also comprises relay driver UR1, relay driver UR1 adopts the chip of MAX4821, relay driver UR1 and MUC control chip U2 corresponding matching, the state of the relay in control signal source selection distributor circuit, signal sample circuit.The pin of MCU control chip U2, relay driver UR1 connects by follow-up signal source selects the connection of distributor circuit, signal sample circuit to coordinate detailed description again.

As Fig. 5, Fig. 6, Fig. 7 and shown in Figure 8: be that the utility model signal source is selected four circuit theory diagrams of selecting to distribute passages in distributor circuit.In Fig. 5, first selects to distribute passage to comprise the first operational amplifier U4A, and the output of described the first operational amplifier U4A is connected by an end of the 9th resistance R 9 and an end of the 11 resistance R 11; The other end of the 9th resistance R 9 is connected with the end of oppisite phase of the first operational amplifier U4A, the other end ground connection of the 11 resistance R 11; The cathode power supply end of the first operational amplifier U4A is connected with+12V voltage, and by the 20 capacitor C 20 ground connection, and the negative electricity source of the first operational amplifier U4A is connected, and passes through the 21 capacitor C 21 ground connection with-12V voltage; The in-phase end of the first operational amplifier U4A is by the 12 resistance R 12 ground connection, and the in-phase end of the first operational amplifier U4A is connected with the output that the test program control signal of exporting for reception signal generation processing module and MCU control the first switching circuit U3 of the control signal of exporting with the USB communicating circuit; The end of oppisite phase of the first operational amplifier U4A is connected with the moving contact of the first relay J 1, and the first fixed contact of the first relay J 1 is connected with the output of the first operational amplifier U4A, and the second fixed contact of the first relay J 1 is by the tenth resistance R 10 ground connection; One end of the first relay J 1 coil is connected with+5V voltage, and the other end is connected with the output of relay driver UR1.The first switch selects circuit U 3 to adopt the chip of CD4051, the first switch selects A end, B end, the C end of circuit U 3 to be connected with U1A, U1B and the U1C port of MCU control chip U2 respectively, the first switch is selected the INH port ground connection of circuit U 3, and the first switch selects circuit U 3 to receive the control signal of MCU control chip U2 by A, B, C and INH port.The first switch selects IN0, IN1, IN2, the IN3 port of circuit U 3 to be connected with SLin, SRin, SExt1, SExt2 respectively, be used for receiving signal and produce the test program control signal of processing module output or the test signal of outside input, the first switch is selected IN4, IN5, IN6 and the equal ground connection of IN7 port of circuit U 3.The vdd terminal that the first switch is selected circuit U 3 is connected with+5V voltage, and by the 22 capacitor C 22 ground connection, the first switch is selected the direct ground connection of VSS end of circuit U 3, and the VEE end that the first switch is selected circuit U 3 is connected, and passes through the 23 capacitor C 23 ground connection with-5V voltage.One end of the first relay J 1 is connected with the OUT1 end of relay driver UR1 one end, relay driver UR1 output signal, make the coil of the first relay J 1 get dead electricity, to control coordinating of the first relay J 1 moving contact and fixed contact, to select corresponding state.The output of the first operational amplifier U4A forms the GFin1 end, and first selects to distribute passage to hold with power amplifier by GFin1 is connected.

In Fig. 6, second selects to distribute passage to comprise the second operational amplifier U4B, and the output of described the second operational amplifier U4B is connected by an end of the 13 resistance R 13 and an end of the 15 resistance R 15; The other end of the 13 resistance R 13 is connected with the end of oppisite phase of the second operational amplifier U4B, the other end ground connection of the 15 resistance R 15; The in-phase end of the first operational amplifier U4B is connected with the output of the second switch circuit U 5 of the control signal of USB communicating circuit output with the test program control signal that is used for the output of reception signal generation processing module and MCU control; The end of oppisite phase of the second operational amplifier U4B is connected with the moving contact of the second relay J 2, and the first fixed contact of the second relay J 2 is connected with the output of the second operational amplifier U4B, and the second fixed contact of the second relay J 2 is by the 14 resistance R 14 ground connection; One end of the second relay J 2 coils is connected with+5V voltage, and the other end is connected with the output of relay driver UR1.The second operational amplifier U4B and the first operational amplifier U4A all adopt the chip of OPA2604AP, and the power end connection of the second operational amplifier U4B is similar to the first operational amplifier U4A, no longer describe in detail herein.

Second switch selects circuit U 5 to adopt the chip of CD4051, second switch selects A end, B end, the C end of circuit U 5 to be connected with U3A, U3B and the U3C port of MCU control chip U2 respectively, second switch is selected the INH port ground connection of circuit U 5, and second switch selects circuit U 5 to receive the control signal of MCU control chip U2 by A, B, C and INH port.Second switch selects IN0, IN1, IN2, the IN3 port of circuit U 5 to be connected with SLin, SRin, SExt1, SExt2 respectively, be used for receiving signal and produce the test program control signal of processing module output or the test signal of outside input, second switch is selected IN4, IN5, IN6 and the equal ground connection of IN7 port of circuit U 5.The vdd terminal that second switch is selected circuit U 5 is connected with+5V voltage, and by the 24 capacitor C 24 ground connection, second switch is selected the direct ground connection of VSS end of circuit U 5, and the VEE end that second switch is selected circuit U 5 is connected, and passes through the 25 capacitor C 25 ground connection with-5V voltage.One end of the second relay J 2 is connected with the OUT2 end of relay driver UR1 one end, relay driver UR1 output signal, make the coil of the second relay J 2 get dead electricity, to control coordinating of the second relay J 2 moving contacts and fixed contact, to select corresponding state.The output of the second operational amplifier U4B forms the GFin2 end, and second selects to distribute passage to hold with power amplifier by GFin2 is connected.

In Fig. 7, the 3rd selects to distribute passage to comprise the 3rd operational amplifier U7A, and the output of described the 3rd operational amplifier U7A is connected by an end of the 17 resistance R 17 and an end of the 19 resistance R 19; The other end of the 17 resistance R 17 is connected with the end of oppisite phase of the 3rd operational amplifier U7A, the other end ground connection of the 19 resistance R 19; The cathode power supply end of the 3rd operational amplifier U7A is connected with+12V voltage, and by the 26 capacitor C 26 ground connection, and the negative electricity source of the 3rd operational amplifier U7A is connected, and passes through the 27 capacitor C 27 ground connection with-12V voltage; The in-phase end of the 3rd operational amplifier U7A is by the 20 resistance R 20 ground connection, and the in-phase end of the 3rd operational amplifier U7A is connected with the output that the test program control signal of exporting for reception signal generation processing module and MCU control the 3rd switching circuit U6 of the control signal of exporting with the USB communicating circuit; The end of oppisite phase of the 3rd operational amplifier U7A is connected with the moving contact of the 3rd relay J 3, and the first fixed contact of the 3rd relay J 3 is connected with the output of the 3rd operational amplifier U7A, and the second fixed contact of the 3rd relay J 3 is by the 18 resistance R 18 ground connection; One end of the 3rd relay J 3 coils is connected with+5V voltage, and the other end is connected with the output of relay driver UR1.

The 3rd switch selects circuit U 6 to adopt the chip of CD4051, the 3rd switch selects A end, B end, the C end of circuit U 6 to be connected with U4A, U4B and the U4C port of MCU control chip U2 respectively, the 3rd switch is selected the INH port ground connection of circuit U 6, and the 3rd switch selects circuit U 6 to receive the control signal of MCU control chip U2 by A, B, C and INH port.The 3rd switch selects IN0, IN1, IN2, the IN3 port of circuit U 6 to be connected with SLin, SRin, SExt1, SExt2 respectively, be used for receiving signal and produce the test program control signal of processing module output or the test signal of outside input, the 3rd switch is selected IN4, IN5, IN6 and the equal ground connection of IN7 port of circuit U 6.The vdd terminal that the 3rd switch is selected circuit U 6 is connected with+5V voltage, and by the 28 capacitor C 28 ground connection, the 3rd switch is selected the direct ground connection of VSS end of circuit U 6, and the VEE end that the 3rd switch is selected circuit U 6 is connected, and passes through the 29 capacitor C 29 ground connection with-5V voltage.One end of the 3rd relay J 3 is connected with the OUT3 end of relay driver UR1 one end, relay driver UR1 output signal, make the coil of the 3rd relay J 3 get dead electricity, to control coordinating of the 3rd relay J 3 moving contacts and fixed contact, to select corresponding state.The output of the 3rd operational amplifier U7A forms the GFin3 end, and the 3rd selects to distribute passage to be connected with power amplifier by described GFin3 end.

In Fig. 8, the 4th selects to distribute passage to comprise four-operational amplifier U7B, and the output of described four-operational amplifier U7B is connected by an end of the 21 resistance R 21 and an end of the 23 resistance R 23; The other end of the 21 resistance R 21 is connected with the end of oppisite phase of four-operational amplifier U7B, the other end ground connection of the 23 resistance R 23; The in-phase end of four-operational amplifier U7B is connected with the output of the 4th switching circuit U8 of the control signal of USB communicating circuit output with the test program control signal that is used for the output of reception signal generation processing module and MCU control; The end of oppisite phase of four-operational amplifier U7B is connected with the moving contact of the 4th relay J 4, and the first fixed contact of the 4th relay J 4 is connected with the output of four-operational amplifier U7B, and the second fixed contact of the 4th relay J 4 is by the 22 resistance R 22 ground connection; One end of the 4th relay J 4 coils is connected with+5V voltage, and the other end is connected with the output of relay driver UR1.Four-operational amplifier U7B and the 3rd operational amplifier U4A all adopt the chip of OPA2604AP, and the power end connection of four-operational amplifier U7B is similar to the 3rd operational amplifier U7A, no longer describe in detail herein.

The 4th switch selects circuit U 8 to adopt the chip of CD4051, the 4th switch selects A end, B end, the C end of circuit U 8 to be connected with U6A, U6B and the U6C port of MCU control chip U2 respectively, the 4th switch is selected the INH port ground connection of circuit U 8, and the 4th switch selects circuit U 8 to receive the control signal of MCU control chip U2 by A, B, C and INH port.The 4th switch selects IN0, IN1, IN2, the IN3 port of circuit U 8 to be connected with SLin, SRin, SExt1, SExt2 respectively, be used for receiving signal and produce the test program control signal of processing module output or the test signal of outside input, the 4th switch is selected IN4, IN5, IN6 and the equal ground connection of IN7 port of circuit U 8.The vdd terminal that the 4th switch is selected circuit U 8 is connected with+5V voltage, and by the 30 capacitor C 30 ground connection, the 4th switch is selected the direct ground connection of VSS end of circuit U 8, and the VEE end that the 4th switch is selected circuit U 8 is connected, and passes through the 31 capacitor C 31 ground connection with-5V voltage.One end of the 4th relay J 4 is connected with the OUT4 end of relay driver UR1 one end, relay driver UR1 output signal, make the coil of the 4th relay J 4 get dead electricity, to control coordinating of the 4th relay J 4 moving contacts and fixed contact, to select corresponding state.The output of four-operational amplifier U7B forms the GFin4 end, and the 4th selector channel is connected with power amplifier by described GFin2 end.

As Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13 and shown in Figure 14: be the schematic diagram of the utility model signal sample circuit.Described signal sample circuit the first sampling reduction voltage circuit, the second sampling reduction voltage circuit, the 3rd sampling reduction voltage circuit and the 4th sampling reduction voltage circuit.As Fig. 9 and shown in Figure 14: the first sampling reduction voltage circuit comprises the 6th relay K 2, one end of described the 6th relay K 2 coils is connected with+5V voltage, the other end is connected with relay driver UR1, and in the utility model embodiment, the other end of the 6th relay K 2 coils is connected with the OUT8 end; The first moving contact energy gating of the 6th relay K 2 connects the first fixed contact, second fixed contact of the 6th relay K 2; The second moving contact energy gating of the 6th relay K 2 connects the 3rd fixed contact, the 4th fixed contact of the 6th relay K 2; Described the first fixed contact is connected with the second fixed contact by the 34 resistance R 34, and by the 36 resistance R 36 ground connection; The second fixed contact is connected with an end of the 37 capacitor C 37 and an end of the 39 capacitor C 39 by the 32 resistance R 32, the other end ground connection of described the 39 capacitor C 39, and the other end of the 37 capacitor C 37 is connected with sampling end GFout1-; The 3rd fixed contact passes through the 30 resistance R 30 ground connection, and is connected with the 4th fixed contact by the 27 resistance R 27; The 4th fixed contact is connected with an end of the 32 capacitor C 32 and an end of the 35 capacitor C 35 by the 25 resistance R 25, the other end ground connection of the 35 capacitor C 35, and the other end of the 32 capacitor C 32 is connected with sampling end GFout1+; The first moving contact and the second moving contact all are connected with the input of the 3rd multiplexed gate UU+1; The GND end ground connection of the 3rd multiplexed gate UU+1, the output of the 3rd multiplexed gate UU+1 is connected with the input of the second gain amplifier UU1; The OUT end of the second gain amplifier UU1 interconnects with the FB end of the second gain amplifier UU1, and the OUT of the second gain amplifier UU1 end is by the 51 resistance R 51 and the rear ground connection of the second adjustable resistance R52 serial connection, and the adjustable end of the second adjustable resistance R52 forms sampling output SRout.

It is the core of MAX389 that the 3rd multiplexed gate UU+1 adopts model.The GND end ground connection of the 3rd multiplexed gate UU+1, the V+ of the 3rd multiplexed gate UU+1 end is connected with+12V, and by the 56 capacitor C 56 ground connection, the V-of the 3rd multiplexed gate UU+1 end is connected with-12V, and by the 55 capacitor C 55 ground connection, the A1 of the 3rd multiplexed gate UU+1, A0 end is connected with MCU control chip U2, the EN termination 5V voltage of the 3rd multiplexed gate UU+1.It is the chip of PGA205BP that the second gain amplifier UU1 adopts model, the MCU control chip U2 of the A0 of the second gain amplifier UU1, A1 is connected, the V+ of the second gain amplifier UU1 end is connected with+12V, and by the 54 capacitor C 54 ground connection, the second gain amplifier UU1-V end is connected, and passes through the 57 capacitor C 57 ground connection with-12V.

As Figure 10 and shown in Figure 14: the schematic diagram that is the second sampling reduction voltage circuit, the second sampling reduction voltage circuit comprises the 7th relay K 4, one end of described the 7th relay K 3 coils is connected with+5V voltage, the other end is connected with relay driver UR1, and in the utility model embodiment, the other end of the 7th relay K 3 coils is connected with the OUT7 end; The first moving contact energy gating of the 7th relay K 3 connects the first fixed contact, second fixed contact of the 7th relay K 3; The second moving contact energy gating of the 7th relay K 3 connects the 3rd fixed contact, the 4th fixed contact of the 7th relay K 3; Described the first fixed contact is connected with the second fixed contact by the 46 resistance R 46, and by the 48 resistance R 48 ground connection; The second fixed contact is connected with an end of the 44 capacitor C 44 and an end of the 47 capacitor C 47 by the 43 resistance R 43, the other end ground connection of described the 47 capacitor C 47, and the other end of the 44 capacitor C 44 is connected with sampling end GFout2-; The 3rd fixed contact passes through the 41 resistance R 41 ground connection, and is connected with the 4th fixed contact by the 39 resistance R 39; The 4th fixed contact is connected with an end of the 40 capacitor C 40 and an end of the 42 capacitor C 42 by the 37 resistance R 37, the other end ground connection of the 42 capacitor C 42, and the other end of the 40 capacitor C 40 is connected with sampling end GFout2+; The first moving contact and the second moving contact all are connected with the input of the 3rd multiplexed gate UU+1; The GND end ground connection of the 3rd multiplexed gate UU+1, the output of the 3rd multiplexed gate UU+1 is connected with the input of the second gain amplifier UU1; The OUT end of the second gain amplifier UU1 interconnects with the FB end of the second gain amplifier UU1, and the OUT of the second gain amplifier UU1 end is by the 51 resistance R 51 and the rear ground connection of the second adjustable resistance R52 serial connection, and the adjustable end of the second adjustable resistance R52 forms sampling output SRout.

As Figure 11 and shown in Figure 14: the schematic diagram that is the 3rd sampling reduction voltage circuit, wherein, the 3rd sampling reduction voltage circuit comprises the 5th relay K 1, one end of described the 5th relay K 1 coil is connected with+5V voltage, the other end is connected with relay driver UR1, and in the utility model embodiment, the other end of the 5th relay K 1 coil is connected with the OUT6 end; The first moving contact energy gating of the 5th relay K 1 connects the first fixed contact, second fixed contact of the 5th relay K 1; The second moving contact energy gating of the 5th relay K 1 connects the 3rd fixed contact, the 4th fixed contact of the 5th relay K 1; Described the first fixed contact is connected with the second fixed contact by the 33 resistance R 33, and by the 35 resistance R 35 ground connection; The second fixed contact is connected with an end of the 36 capacitor C 36 and an end of the 38 capacitor C 38 by the 31 resistance R 31, the other end ground connection of described the 38 capacitor C 38, and the other end of the 36 capacitor C 36 is connected with sampling end GFout3-; The 3rd fixed contact passes through the 29 resistance R 29 ground connection, and is connected with the 4th fixed contact by the 28 resistance R 28; The 4th fixed contact is connected with an end of the 33 capacitor C 33 and an end of the 34 capacitor C 34 by the 26 resistance R 26, the other end ground connection of the 34 capacitor C 34, and the other end of the 33 capacitor C 33 is connected with sampling end GFout3+; The first moving contact and the second moving contact all are connected with the input of the 3rd multiplexed gate UU+1; The GND end ground connection of the 3rd multiplexed gate UU+1, the output of the 3rd multiplexed gate UU+1 is connected with the input of the second gain amplifier UU1; The OUT end of the second gain amplifier UU1 interconnects with the FB end of the second gain amplifier UU1, and the OUT of the second gain amplifier UU1 end is by the 51 resistance R 51 and the rear ground connection of the second adjustable resistance R52 serial connection, and the adjustable end of the second adjustable resistance R52 forms sampling output SRout.

As Figure 12 and shown in Figure 14: the schematic diagram that is the 4th sampling reduction voltage circuit, wherein, the 4th sampling reduction voltage circuit comprises the 8th relay K 4, one end of described the 8th relay K 4 coils is connected with+5V voltage, the other end is connected with relay driver UR1, and in the utility model embodiment, the other end of the 8th relay K 4 coils is connected with the OUT5 end; The first moving contact energy gating of the 8th relay K 4 connects the first fixed contact, second fixed contact of the 8th relay K 4; The second moving contact energy gating of the 8th relay K 4 connects the 3rd fixed contact, the 4th fixed contact of the 8th relay K 4; Described the first fixed contact is connected with the second fixed contact by the 45 resistance R 45, and by the 47 resistance R 47 ground connection; The second fixed contact is connected with an end of the 45 capacitor C 45 and an end of the 46 capacitor C 46 by the 44 resistance R 44, the other end ground connection of described the 46 capacitor C 46, and the other end of the 45 capacitor C 45 is connected with sampling end GFout4-; The 3rd fixed contact passes through the 42 resistance R 42 ground connection, and is connected with the 4th fixed contact by the 40 resistance R 40; The 4th fixed contact is connected with an end of the 41 capacitor C 41 and an end of the 43 capacitor C 43 by the 38 resistance R 38, the other end ground connection of the 43 capacitor C 43, and the other end of the 41 capacitor C 41 is connected with sampling end GFout4+; The first moving contact and the second moving contact all are connected with the input of the 3rd multiplexed gate UU+1; The GND end ground connection of the 3rd multiplexed gate UU+1, the output of the 3rd multiplexed gate UU+1 is connected with the input of the second gain amplifier UU1; The OUT end of the second gain amplifier UU1 interconnects with the FB end of the second gain amplifier UU1, and the OUT of the second gain amplifier UU1 end is by the 51 resistance R 51 and the rear ground connection of the second adjustable resistance R52 serial connection, and the adjustable end of the second adjustable resistance R52 forms sampling output SRout.

As shown in figure 13: also comprise the first multiplexed gate U1+1 and the second multiplexed gate U1-1; The input of the first multiplexed gate U1+1, the second multiplexed gate U1-1 is connected by the reference data module, and respectively by the first common ground module PR1, the second common ground module PR2 ground connection; The output of the first multiplexed gate U1+1, the second multiplexed gate U1-1 is connected with the first gain amplifier UI1, the OUT end of described the first gain amplifier UI1 interconnects with the FB end of the first gain amplifier UI1, and the OUT of the first gain amplifier UI1 end is by the 49 resistance R 49 and the rear ground connection of the first adjustable resistance R50 serial connection, and the adjustable end of the first adjustable resistance R50 forms sampling output SLout.It is the chip of MAX388 that the first multiplexed gate U1+1, the second multiplexed gate U1-1 all adopt model, the GND end ground connection of the first multiplexer U1+1, the V+ of the first multiplexer U1+1 end is connected with+12V, and by the 48 capacitor C 48 ground connection, the V-of the first multiplexer U1+1 end is connected, and passes through the 49 capacitor C 49 ground connection with-12V.The V+ of the second multiplexer U1-1 end is connected with+12V, and by the 52 capacitor C 52 ground connection, and the V-of the second multiplexer U1-1 end is connected, and passes through the 53 capacitor C 53 ground connection with-12V.The DGND of the first gain amplifier UI1 end ground connection, the V+ end of the first gain amplifier UI1 is connected, and passes through the 50 capacitor C 50 ground connection with+12V voltage.It is the chip of PGA205BP that the first gain amplifier UI1 adopts model.

The first sampling reduction voltage circuit, the second sampling reduction voltage circuit, the 3rd sampling reduction voltage circuit and the 4th sampling reduction voltage circuit are connected with the 3rd multiplexed gate UU+1 respectively, by the corresponding sampled signal of MCU control chip U2 gating, the sampling reduction voltage circuit is mainly after the voltage after sampling is carried out step-down.Signal sample circuit produces in processing module with sampling output SRout input signal by sampling output SLout, coordinates so that signal produces processing module the monitoring that realizes the signal of speaker operation state with monitoring of software.

As Fig. 1 ~ shown in Figure 17: utilize the power of loudspeaker test macro of said structure, its power testing method comprises the steps:

A, provide loud speaker to be measured, and described loud speaker to be measured is connected with the output of power amplifier and the sampling end of power measuring;

B, set test-types and test parameter in the testing software of main control computer, make signal produce the corresponding test of processing module output program control signal, and will test in program control signal input power tester; Simultaneously, main control computer is by USB communication modes output control signal, to select and the corresponding test of distribution program control signal;

The test program control signal that c, power measuring will be selected to distribute drives speaker operation to be measured by power amplifier, and the status signal of power measuring during to speaker operation to be measured sampled, and is transferred to the signal generation processing module in main control computer;

D, signal produce processing module and coordinate the status signal with speaker operation the time with testing software and test program control signal and analyze comparison, to judge and to export the operating state of loud speaker and the running status of whole test macro.

Analyze comparison when signal processing module and testing software detect the status signal that coordinates with speaker operation the time with testing program control signal, judge whether loud speaker produces cause thermal damage and mechanical failure; When loud speaker produces cause thermal damage or mechanical loss, export information by main control computer.

as shown in Figure 1: the utility model produces processing module by the signal in main control computer and produces needed test program control signal (can also provide the two-way outer signal simultaneously), select distributor circuit by the signal source in the power test instrument, signal is selected to distribute to power amplifier, power amplifier drives loudspeaker group to be measured, the loudspeaker group is started working, produce in processing module by the signal sample circuit input signal that the set of speakers working state signal is real-time, produce processing module by signal returned data is processed to judge the operating state of set of speakers and the running status of whole system.The computer of remote monitoring simultaneously communicates by Ethernet and main control computer realizes real time monitoring function.

The utility model signal source selects distributor circuit to adopt four-way, and the switching of four-way distributes to complete by signal.After signal produces the signal process signal source selection distribution module of processing module output, be assigned to the input channel of No. four power amplifiers by four analog switches, each select to distribute passage to control respectively, and the user can situation to be measured according to reality selects to meet the port number of this test.

The utility model adopts differential mode that set of speakers working signal to be measured is sampled, and is conducive to improve common-mode rejection ratio, and then improves sampling precision, and particularly effect is particularly evident when measuring the small-power set of speakers.

The utility model power circuit adopts the linear power supply switching device, and stable, reliable power supply can be provided for other test circuits of test instrument.

The utility model utilizes computer to produce the required various signals of power of loudspeaker test, utilize the operating state of computer software Real-Time Monitoring, real-time analysis device under test, in order to make corresponding prompting, and testing crew can be understood by remote monitoring the real-time status of test.

The utility model can carry out maximum noise power experiment, long-term maximum power experiment, the experiment of short-term maximum power, the experiment of specified maximum sinusoidal power, optimal power nominal experiment and user can be self-defined etc. the kinds of experiments kind;

The utility model can utilize the multi-signals such as white noise signal, pink noise signal, simulated programmer signal, the outer signal that also can adopt the user to provide for oneself, thus satisfy user's specific demand; Also can carry out simultaneously the power experiment of multichannel unlike signal type.

The utility model testing crew can carry out remote monitoring to test by the remote monitoring computer, thereby has protected the hearing of testing crew; But automatic shutoff signal after running into loud speaker damage in test process stops experiment, avoid damaging power amplifier, and real-time monitoring system can be informed information testing crew accurately, accomplishes real-time manual control;

The utility model is in test process, can judge by the real-time operating state to test macro of the monitoring of software in main control computer, can be by the testing software objective interface find out the USB connection status, can find out intuitively by the status bar of testing software the operating state of current loud speaker, detecting information that can be by observation test software judges the operating state of power amplifier.

The man-machine interface of the utility model device software system is friendly, and the user is easy to operate; Propagable scope is the enterprise relevant with loud speaker, sound equipment, home theater, TV, broadcasting, automobile audio, computer media, mobile phone, telephone set, radio-cassette player, electronic toy etc., electroacoustic enterprise, quality supervision and test departments, relevant school, R﹠D institution etc.

Claims

1. the power test system of a loud speaker, comprise main control computer and the power amplifier that is used for driving loud speaker to be measured; It is characterized in that: main control computer is connected with power amplifier by power measuring, and power amplifier is connected with the output of power measuring, comprises in main control computer that USB interface and signal produce processing module; Main control computer carries out communication by USB interface and power measuring, main control computer can produce the required test program control signal of processing module output by signal, in the test program control signal through-put power tester that signal generation processing module will produce, main control computer is by selection and the distribution of USB Communication Control power measuring to the test program control signal, so that the test program control signal of selecting is assigned in corresponding power amplifier, power amplifier drives loud speaker to be measured according to the test program control signal; The status signal of power measuring during to speaker operation to be measured sampled, and the signal that is transferred in main control computer produces processing module, signal produces processing module and coordinates the status signal with speaker operation the time with testing software and test program control signal and analyze comparison, to judge and to export the operating state of loud speaker and the running status of whole test macro.

2. the power test system of loud speaker according to claim 1 is characterized in that: described power measuring comprises that MCU controls and USB communicating circuit, signal source are selected distributor circuit, signal sample circuit and be used to power measuring that the power circuit of working power is provided; Power measuring utilizes MCU to control and the USB communicating circuit is connected with main control computer by the USB mode, signal source selects the control end of distributor circuit to control with MCU and the USB communicating circuit is connected, signal source selects the input of distributor circuit to be connected with signal generation processing module, signal source selects the output of distributor circuit to be connected with power amplifier, the status signal of signal sample circuit during to speaker operation to be measured sampled, and status signal is input to signal produces processing module.

3. the power test system of loud speaker according to claim 1, it is characterized in that: described main control computer is connected with the remote monitoring computer by Ethernet, and the remote monitoring computer is monitored the operating state of loud speaker to be measured and the running status of whole test macro by Ethernet.

4. the power test system of loud speaker according to claim 2 is characterized in that: described MCU controls and the USB communicating circuit is connected with main control computer by the USB buffer circuit.

5. the power test system of loud speaker according to claim 2, it is characterized in that: described power circuit comprises the first voltage follower circuit, second voltage output circuit and tertiary voltage output circuit;

Described the first voltage follower circuit comprises the first transformer (T1), the centre cap ground connection of described the first transformer (T1) secondary winding, the two ends of the first transformer (T1) secondary winding are connected with the first rectifier bridge, one output of the first rectifier bridge is connected with the IN end of the first pressurizer (U9), and another output of the first rectifier bridge is connected with the IN end of the second pressurizer (U10); The IN end of the first pressurizer (U9) is connected with the cathode terminal of the first diode (D1), and by the 59 electric capacity (C59) ground connection; The anode tap of the first diode (D1) is connected with the OUT end of the first pressurizer (U9); The OUT end of the first pressurizer (U9) also is connected with the cathode terminal of the second diode (D2), and the anode tap of the second diode (D2) is connected with the ADJ end of the first pressurizer (U9), and the two ends of the second diode (D2) are parallel with the 53 resistance (R53); The ADJ end of the first pressurizer (U9) is also by the 54 resistance (R54) ground connection, and the two ends of the 54 resistance (R54) are parallel with the 65 electric capacity (C65) and the 67 electric capacity (C67); The two ends of the 59 electric capacity (C59) are parallel with the 58 electric capacity (C58); The OUT end of the first pressurizer (U9) is also by the 60 electric capacity (C60) ground connection, and the two ends of the 60 electric capacity (C60) are parallel with the 61 electric capacity (C61); The OUT end output+12V voltage of the first pressurizer (U9);

The IN end of the second pressurizer (U10) is by the 73 electric capacity (C73) ground connection, and the two ends of described the 73 electric capacity (C73) are parallel with the 71 electric capacity (C71); The OUT of the second pressurizer (U10) end respectively with an end of the 56 resistance (R56), an end of the 72 electric capacity (C72), the cathode terminal of the anode tap of the 4th diode (D4) and the 5th diode (D5) is connected, the anode tap of the 5th diode (D5) is connected with the IN end of the second pressurizer (U10), the cathode terminal of the 4th diode (D4) is connected with the ADJ end of the second pressurizer (U10), the other end ground connection of the 72 electric capacity (C72), the other end of the 56 resistance (R56) is connected with the ADJ end of the second pressurizer (U10); The two ends of the 72 electric capacity (C72) are parallel with the 70 electric capacity (C70); The ADJ end of the second pressurizer (U10) is by the 55 resistance (R55) ground connection, and the two ends of described the 55 resistance (R55) are parallel with the 66 electric capacity (C66) and the 67 electric capacity (C67); The OUT end output-12V voltage of the second pressurizer (U10);

The second voltage output circuit comprises the second transformer (T2), the centre cap ground connection of described the second transformer (T2) secondary winding, the two ends of the second transformer (T2) secondary winding are connected with the second rectifier bridge, one end of the second rectifier bridge is connected with the IN end of the 3rd pressurizer (U11), and the other end of the second rectifier bridge is connected with the IN end of the 4th pressurizer (U12); The IN end of the 3rd pressurizer (U11) is also by the 78 electric capacity (C78) ground connection, and be connected with the cathode terminal of the 6th diode (D6), the anode tap of the 6th diode (D6) is connected with the OUT end of the 3rd pressurizer (U11), and the two ends of the 78 electric capacity (C78) are parallel with the 76 electric capacity (C76); The OUT end of the 3rd pressurizer (U11) also is connected with an end of the 7th diode (D7) and the 77 electric capacity (C77), the other end ground connection of the 77 electric capacity (C77), the anode tap of the 7th diode (D7) is connected with the ADJ end of the 3rd pressurizer (U11); The two ends of the 7th diode (D7) are parallel with the 57 resistance (R57); The two ends of the 77 electric capacity (C77) are parallel with the 76 electric capacity (C79); The ADJ end of the 3rd pressurizer (U11) is by the 58 resistance (R58) ground connection, and the two ends of the 58 resistance (R58) are parallel with the 81 electric capacity (C81) and the 80 electric capacity (C80); The OUT end output+5V voltage of the 3rd pressurizer (U11);

The IN end of the 4th pressurizer (U12) is by the 87 electric capacity (C87) ground connection, and the two ends of described the 87 electric capacity (C87) are parallel with the 86 electric capacity (C86); The GND end ground connection of the 4th pressurizer (U12), the OUT end of the 4th pressurizer (U12) is by the 84 electric capacity (C84) ground connection, and the two ends of described the 84 electric capacity (C84) are parallel with the 85 electric capacity (C85); The OUT end output-5V voltage of the 4th pressurizer (U12);

the tertiary voltage output circuit comprises the 5th pressurizer (U1), the IN of described the 5th pressurizer (U1) end is connected with+5V voltage, and the IN of the 5th pressurizer (U1) end is by the first electric capacity (C1) ground connection, the two ends of described the first electric capacity (C1) are parallel with the second electric capacity (C2), the GND end ground connection of the 5th pressurizer (U1), two outputs of the 5th pressurizer (U1) are all by the 3rd electric capacity (C3) ground connection, the two ends of the 3rd electric capacity (C3) are parallel with respectively the 4th electric capacity (C4), the 5th electric capacity (C5), the 6th electric capacity (C6), the 7th electric capacity (C7) and the 8th electric capacity (C8), the output output 3.3V voltage of the 5th pressurizer (U1).

6. the power test system of loud speaker according to claim 2, it is characterized in that: described signal source selects distributor circuit to comprise the first operational amplifier (U4A), and the output of described the first operational amplifier (U4A) is connected by an end of the 9th resistance (R9) and an end of the 11 resistance (R11); The other end of the 9th resistance (R9) is connected with the end of oppisite phase of the first operational amplifier (U4A), the other end ground connection of the 11 resistance (R11); The cathode power supply end of the first operational amplifier (U4A) is connected with+12V voltage, and by the 20 electric capacity (C20) ground connection, and the negative electricity source of the first operational amplifier (U4A) is connected, and passes through the 21 electric capacity (C21) ground connection with-12V voltage; The in-phase end of the first operational amplifier (U4A) is by the 12 resistance (R12) ground connection, and the in-phase end of the first operational amplifier (U4A) is connected with the output that the test program control signal of exporting for reception signal generation processing module and MCU control first switching circuit (U3) of the control signal of exporting with the USB communicating circuit; The end of oppisite phase of the first operational amplifier (U4A) is connected with the moving contact of the first relay (J1), the first fixed contact of the first relay (J1) is connected with the output of the first operational amplifier (U4A), and the second fixed contact of the first relay (J1) is by the tenth resistance (R10) ground connection; One end of the first relay (J1) coil is connected with+5V voltage, and the other end is connected with the output of relay driver (UR1).

7. the power test system of loud speaker according to claim 2, it is characterized in that: described signal sample circuit comprises the 6th relay (K2), one end of described the 6th relay (K2) coil is connected with+5V voltage, and the other end is connected with relay driver (UR1); The first moving contact energy gating of the 6th relay (K2) connects the first fixed contact, second fixed contact of the 6th relay (K2); The second moving contact energy gating of the 6th relay (K2) connects the 3rd fixed contact, the 4th fixed contact of the 6th relay (K2); Described the first fixed contact is connected with the second fixed contact by the 34 resistance (R34), and by the 36 resistance (R36) ground connection; The second fixed contact is connected with an end of the 37 electric capacity (C37) and an end of the 39 electric capacity (C39) by the 32 resistance (R32), the other end ground connection of described the 39 electric capacity (C39), the other end of the 37 electric capacity (C37) is connected with sampling end GFout1-; The 3rd fixed contact passes through the 30 resistance (R30) ground connection, and is connected with the 4th fixed contact by the 27 resistance (R27); The 4th fixed contact is connected with an end of the 32 electric capacity (C32) and an end of the 35 electric capacity (C35) by the 25 resistance (R25), the other end ground connection of the 35 electric capacity (C35), the other end of the 32 electric capacity (C32) is connected with sampling end GFout1+; The first moving contact and the second moving contact all are connected with the input of the 3rd multiplexed gate (UU+1); The GND end ground connection of the 3rd multiplexed gate (UU+1), the output of the 3rd multiplexed gate (UU+1) is connected with the input of the second gain amplifier (UU1); The OUT end of the second gain amplifier (UU1) interconnects with the FB end of the second gain amplifier (UU1), and the OUT of the second gain amplifier (UU1) end is by the 51 resistance (R51) and the rear ground connection of the second adjustable resistance (R52) serial connection, and the adjustable end of the second adjustable resistance (R52) forms sampling output SRout;

Also comprise the first multiplexed gate (U1+1) and the second multiplexed gate (U1-1); The input of the first multiplexed gate (U1+1), the second multiplexed gate (U1-1) is connected by the reference data module, and respectively by the first common ground module (PR1), the second common ground module (PR2) ground connection; The output of the first multiplexed gate (U1+1), the second multiplexed gate (U1-1) is connected with the first gain amplifier (UI1), the OUT end of described the first gain amplifier (UI1) interconnects with the FB end of the first gain amplifier (UI1), and the OUT of the first gain amplifier (UI1) end is by the 49 resistance (R49) and the rear ground connection of the first adjustable resistance (R50) serial connection, and the adjustable end of the first adjustable resistance (R50) forms sampling output SLout.