CN102141578A - Program-controlled electronic load device with compensating power supply - Google Patents
Program-controlled electronic load device with compensating power supply Download PDFInfo
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- CN102141578A CN102141578A CN2010106136384A CN201010613638A CN102141578A CN 102141578 A CN102141578 A CN 102141578A CN 2010106136384 A CN2010106136384 A CN 2010106136384A CN 201010613638 A CN201010613638 A CN 201010613638A CN 102141578 A CN102141578 A CN 102141578A
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Abstract
The invention relates to a program-controlled electronic load device with a compensating power supply. A conventional electronic load device has the defects of low resolution and low automation level. In the invention, a microprocessor module is connected with a first D/A (Digital/Analog) conversion module, an electronic load regulation module and an electronic load output module to form a program-controllable electronic load, and the microprocessor module is connected with a second D/A conversion module, a compensating power supply regulation module, a compensating power supply output module and an A/D (Analog/Digital) conversion module to form a closed-loop program-controllable electronic load compensating power supply. The microprocessor module is connected with a serial communication module to realize communication with an upper computer and other CPUs (Central Processing Units). By utilizing a Darlington transistor with the characteristics of high response speed, good stability, small power consumption, low noise and long service life, the invention realizes the electronic load device with the compensating power supply, which is free from mechanical contacts and moving parts and has the characteristics of fast response, high sensitivity, low noise, long service life and reliable performance.
Description
Technical field
The invention belongs to the electric detective technology field, relate to a kind of electronic load device, be mainly used in the I-V Characteristics Detection of sun power cell and solar module with offset supply.
Background technology
No matter be the solar cell that crystalline silicon or membraneous material are made, when research and production, all need functional characteristic tests such as photoelectric characteristic, guaranteeing properties of product quality, control working condition and to improve process, thereby reach the purpose of production high-level efficiency, low cost and long-life product.And in solar energy photovoltaic system, the most important thing is solar cell, and the output power of single solar cell is very limited, how to form photovoltaic array with cascade system, and the isoparametric coherence request of these photoelectric properties to each solar cell is very high.But be subjected to the restriction of battery manufacturing process, light, the electrical quantity of the solar cell that requirement is produced in enormous quantities are in full accord and unrealistic, and the test of solar cell and sorting are necessary operations in solar cell, the photovoltaic module production run.As solar cell I-V family curve is the important evidence of weighing solar cell quality quality.In measuring the loop, voltage table is attempted by on the solar cell, and reometer and variable resistor are serially connected in the loop in the four-wire system mode, by continuous change resistance value, the voltage at continuous coverage solar cell two ends and the electric current that passes through can obtain the I-V family curve of solar cell.But the resolving power of rheochord resistance is low, be difficult for realizing measuring automatically, therefore the some metal-oxide-semiconductors of general employing constitute electronic loads, but there is voltage drop in the measurement loop that comprises electronic load, desire to make the solar cell both end voltage to equal zero, to measure the short-circuit current Isc of this moment, needing increases offset supply in the electronic load circuit, constitute a kind of program-controlled electronic load device with offset supply.This no mechanical contact of device and moving component have quick, highly sensitive, the advantages such as noise is low, the life-span is long, dependable performance of response, satisfy the load of solar cell detection system and adjust demand automatically.
Summary of the invention
Purpose of the present invention just provides a kind of program-controlled electronic load device with offset supply.
The present invention includes power module, microprocessor module, a D/A modular converter, electronic load adjusting module, electronic load output module, the 2nd D/A modular converter, offset supply adjusting module, offset supply output module, A/D modular converter and serial communication module.
Described power module by a slice LM338 provide+24V, a slice LM333 provide-24V, a slice MC7815T provide+15V, a slice LM7915CT provide-15V, another sheet LM338 provide+5V, a slice MC7905T provide-5V, a slice SPX1117M-3.3 provide+3.3V power supply, a slice LT1461AIS8-2.5 provide+the 2.5V power supply, provide+the 38V power supply by rectifier bridge RS607, be respectively other module for power supply of device.
Microprocessor module comprises LPC2214 chip, the first bi-directional voltage converter SN74LVC4245DW chip, the second bi-directional voltage converter SN74LVC4245DW chip, the 3rd bi-directional voltage converter SN74LVC4245DW chip and a slice GAL chip ATF16V8B15PI of PHILIP company.Wherein 2 pin of LPC2214 chip, 13 pin, 14 pin, 16 pin, 31 pin, 39 pin, 51 pin, 57 pin, 69 pin, 77 pin, 94 pin, 104 pin, 112 pin, 119 pin and 123 pin and power module+the 3.3V output terminal is connected; 23 pin of first, second and the 3rd bi-directional voltage converter SN74LVC4245DW chip, 24 pin and power module+the 3.3V output terminal is connected, 1 pin and power module+the 5V output terminal is connected; 20 pin of chip ATF16V8B15PI and power module+the 5V output terminal is connected.Obtain operating voltage respectively.
The one D/A modular converter comprises a D/A conversion chip DAC8831ICD and the first operational amplifier OP177FP.The signal of the SPI_MOSI_O signal end of microprocessor module, SPI_CLK_O signal end, SPI_SC1_O signal end and LDAC signal end outputs to a D/A modular converter, produce required sheet choosing, clock, input data, the output enable signal of D/A conversion respectively, the output of the one D/A conversion chip DAC8831ICD realizes voltage follow by the first operational amplifier OP177FP, and outputs to the electronic load adjusting module.Power module+the 5V output terminal is connected with 14 pin of a DAC8831ICD chip, for it provides operating voltage.Power module ± the 5V output terminal is connected with 4 pin with 7 pin of an OP177FP chip respectively, for it provides operating voltage.Power module+the 2.5V output terminal is connected with 5 pin, 6 pin of a DAC8831ICD chip, for it provides conversion reference voltage.
The output of the one D/A modular converter in the electronic load adjusting module behind two electric resistance partial pressures, be connected with 3 pin of operational amplifier OPA445AP chip, the feedback signal of electronic load output module is connected with 2 pin of operational amplifier OPA445AP chip, 6 pin of operational amplifier OPA445AP chip are connected with the electronic load output module, and voltage is adjusted in output.Power module ± the 24V output terminal is connected with 4 pin with 7 pin of OPA445AP chip respectively, for it provides operating voltage.
The electronic load output module is made up of the first NPN transistor 2N2222A, the second NPN transistor 2N2222A, the 3rd NPN transistor 2N2222A, the first NPN transistor 2N3440, the first Darlington transistor TIP142, sampling resistor RS400 and operational amplifier OP27A.The output of electronic load adjusting module is after the first and second NPN transistor 2N2222A and first NPN transistor 2N3440 amplification, be input to 1 pin (base stage) of the first Darlington transistor TIP142, the electric current of this pipe is flow through in control, 2 pin (collector) of the first Darlington transistor TIP142 are the output terminals of electronic load, 3 pin (emitter) of the first Darlington transistor TIP142 are connected with sampling resistor, sampled value feeds back to the electronic load adjusting module after operational amplifier OP27A amplifies.The 3rd NPN transistor 2N2222A is used for overcurrent protection, power module ± the 15V output terminal is connected with 4 pin with 7 pin of OP27A chip respectively, for it provides operating voltage.
The 2nd D/A modular converter comprises the 2nd D/A conversion chip DAC8831ICD and the second operational amplifier OP177FP.The signal of the SPI_MOSI_O signal end of microprocessor module, SPI_CLK_O signal end, SPI_SC2_O signal end and LDAC signal end outputs to the 2nd D/A modular converter, produce required sheet choosing, clock, input data, the output enable signal of D/A conversion respectively, the output of the 2nd D/A conversion chip DAC8831ICD realizes voltage follow by the second operational amplifier OP177FP, and outputs to the offset supply adjusting module.Power module+the 5V output terminal is connected with 14 pin of the 2nd DAC8831ICD chip, for it provides operating voltage.Power module ± the 5V output terminal is connected with 4 pin with 7 pin of the 2nd OP177FP chip respectively, for it provides operating voltage.
The offset supply adjusting module is made of the 3rd operational amplifier OP177FP, the output of the 2nd D/A modular converter is connected with 3 pin of the 3rd operational amplifier OP177FP, the feedback signal of offset supply output module is connected with 2 pin of the 3rd operational amplifier OP177FP, 6 pin of the 3rd operational amplifier OP177FP chip are connected with the offset supply output module, and voltage is adjusted in output.Power module ± the 15V output terminal is connected with 4 pin respectively with 7 pin of the 3rd OP177FP chip, for it provides operating voltage.
The offset supply output module is made up of the 4th NPN transistor 2N2222A, the 5th NPN transistor 2N2222A, the 6th NPN transistor 2N2222A, the second NPN transistor 2N3440, the 3rd NPN transistor 2N3440 and the second Darlington transistor TIP142.The output of offset supply adjusting module is after the 4th and the 5th NPN transistor 2N2222A and second NPN transistor 2N3440 amplification, be input to 1 pin (base stage) of the second Darlington transistor TIP142, the pressure drop at these pipe two ends is flow through in control, 3 pin (emitter) of the second Darlington transistor TIP142 are the output terminal/feedback ends of offset supply, 2 pin (collector) of the second Darlington transistor TIP142 and power module+the 24V output terminal is connected.The 6th NPN transistor 2N2222A is used for overcurrent protection, and the 3rd NPN transistor 2N3440 is owing to receive negative current.
The A/D modular converter is made of A/D conversion chip ADS8505IBDB, the output terminal of offset supply output module is connected with 1 pin of ADS8505IBDB chip, 6～13 pin of ADS8505IBDB chip, 15～22 pin are connected with the AD0～AD15 end of microprocessor module respectively, and the A/D transformation result is transmitted moving microprocessor module.Power module+the 5V output terminal is connected with 27 pin, 28 pin of ADS8505IBDB chip, for it provides operating voltage.
The serial communication module is by 1 serial port chip SP3232EEY, by power module+the 3.3V output terminal is connected with 16 pin of serial port chip, for it provides operating voltage.Two serial ports passages of RS232 chip SP3232EEY are being connected of realization and PC, other man-machine interface respectively.
Principle of work of the present invention: connect working power, power module is other module for power supply of the electronic load device of band offset supply, microprocessor module is finished hardware initialization work, by the serial communication module, accept electronic load adjustment order and power supply compensation order that host computer or other man-machine interface are provided with.When carrying out the load adjustment, if loop current value that host computer is given, then microprocessor module calculates the correspondent voltage setting value according to the sampling resistor value, export aanalogvoltage to the electronic load adjusting module through a D/A modular converter, the electronic load adjusting module is adjusted the output of electronic load output module according to the feedback voltage value of the acquisition on the sampling resistor in this setting value and the electronic load output module by the electronic load adjusting module.When carrying out the power supply compensation, offset according to the host computer setting, microprocessor module is exported aanalogvoltage to the offset supply adjusting module through the 2nd D/A modular converter, the offset supply adjusting module is adjusted the output of offset supply output module according to the value of feedback in this setting value and the offset supply output module by the offset supply adjusting module.Value of feedback in the offset supply output module is simultaneously by being sent to microprocessor module after the conversion of A/D modular converter.
The present invention utilizes that the response speed of Darlington transistor is fast, good stability, power consumption is little, noise is low, the life-span is long characteristics, realized a kind ofly not having mechanical contact and moving component, response is quick, highly sensitive, noise is low, the life-span is long, the electronic load device of the band offset supply of dependable performance, satisfy the load of solar cell detection system and adjust demand automatically.
Description of drawings
Fig. 1 is a principle of the invention structural representation;
Fig. 2 is the microprocessor module synoptic diagram;
Fig. 3 is a D/A modular converter synoptic diagram;
Fig. 4 is an electronic load adjusting module synoptic diagram;
Fig. 5 is an electronic load output module synoptic diagram;
Fig. 6 is the 2nd D/A modular converter synoptic diagram;
Fig. 7 is an offset supply adjusting module synoptic diagram;
Fig. 8 is an offset supply output module synoptic diagram;
Fig. 9 is an A/D modular converter synoptic diagram;
Figure 10 is the serial communication module diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the electronic load device of band offset supply comprises power module 1, microprocessor module 2, first D/A modular converter 3, electronic load adjusting module 4, electronic load output module 5, second D/A modular converter 6, offset supply adjusting module 7, offset supply output module 8, A/D modular converter 9 and serial communication module 10.
Described power module 1 by a slice LM338 provide+24V, a slice LM333 provide-24V, a slice MC7815T provide+15V, a slice LM7915CT provide-15V, another sheet LM338 provide+5V, a slice MC7905T provide-5V, a slice SPX1117M-3.3 provide+3.3V, a slice LT1461AIS8-2.5 provide+2.5V, provide+38V by rectifier bridge RS607, be respectively other module for power supply of device.
Microprocessor module is connected with a D/A modular converter, electronic load adjusting module, electronic load output module, constitutes the electronic load of program-controlled adjustment.Microprocessor module is connected with second D/A modular converter, offset supply adjusting module, offset supply output module, A/D modular converter, constitutes the electronic load offset supply of closed loop, program-controlled adjustment.
As shown in Figure 2, microprocessor module 2 comprises LPC2214 chip, first bi-directional voltage converter SN74LVC4245DW chip of PHILIP company, second bi-directional voltage converter SN74LVC4245DW chip, the 3rd bi-directional voltage converter SN74LVC4245DW chip and a slice GAL chip ATF16V8B15PI.25 pin (P0.28/AIN1/CAP0.2/MAT0.2) of LPC2214 chip wherein, 69 pin (P0.7/SSELD/PWM2/EINT2), 70 pin (P1.24/TRACECLK), 60 pin (P1.25/EXTIN0), 59 pin (P0.4/SCK0/CAP0.1) and 68 pin (P0.6/MOSI0/CAP0.2) respectively with 16 pin of first bi-directional voltage converter SN74LVC4245DW chip, 17 pin, 18 pin, 19 pin, 20 pin and 21 pin (B6～B1) be connected, 4 pin (P0.21/PWM5/RD3/CAP1.3) are connected with 2 pin (DIR) of first bi-directional voltage converter SN74LVC4245DW chip, 98 pin, 105 pin, 106 pin, 108 pin, 109 pin, 114 pin, 115 pin, 116 pin (P2.0/D0～P2.7/D7) respectively with 21～14 pin (B1～B8) be connected of second bi-directional voltage converter SN74LVC4245DW chip, 117 pin, 118 pin, 120 pin, 124 pin, 125 pin, 127 pin, 129 pin, 130 pin (P2.8/D8～P2.15/D15) respectively with 21～14 pin (B1～B8) be connected of the 3rd bi-directional voltage converter SN74LVC4245DW chip, 90 pin (P1.1/OE), 74 pin (P3.5/A5), 73 pin (P3.6/A6), 72 pin (P3.7/A7), 71 pin (P3.8/A8), 35 pin (P3.25/CS2/RD6), 30 pin (P3.26/CS1), 29 pin (P3.27/WE) are connected with the end of resistance R 151～R158 respectively, the other end of resistance R 151～R158 is connected with 2～9 pin (IN) of GAL chip ATF16V8B15PI respectively, 142 pin (XTAL1) of LPC2214 chip respectively with the XTAL1 pin of crystal oscillator Y101, one end of resistance R 163, one end of capacitor C 158 connects, the other end of resistance R 163 respectively with 141 pin (XTAL2) of LPC2214 chip, the XTAL2 pin of crystal oscillator Y101, one end of capacitor C 159 connects, the other end of capacitor C 158 is connected with the other end of capacitor C 159, and be connected to ground wire (GND), 3 pin of LPC2214 chip, 9 pin, 26 pin, 38 pin, 54 pin, 67 pin, 79 pin, 93 pin, 103 pin, 107 pin, 111 pin, 128 pin, 138 pin, 139 pin (VSS) all are connected to ground wire (GND), 2 pin, 14 pin, 31 pin, 39 pin, 51 pin, 57 pin, 77 pin, 94 pin, 104 pin, 112 pin and 119 pin (V3) and power module 1+the 3.3V output terminal is connected, 13 pin (P2.26/D26/BOOT0) are connected with an end of resistance R 191,16 pin (P2.27/D27/BOOT1) are connected with an end of resistance R 192, the other end of resistance R 191 respectively with the other end of resistance R 192, power module 1+connection of 3.3V output terminal, 123 pin (P0.20/MAT1.3/SSEL1/EINT3) of LPC2214 chip are connected with an end of resistance R 136, the other end of resistance R 136 and power module 1+the 3.3V output terminal is connected.42 pin (P0.0/TXD0/PWM1) of the LPC2214 chip of microprocessor module 2,49 pin (P0.1/RXD0/PWM3/EINT0), 75 pin (P0.8/TXD1/PWM4) and 76 pin (P0.9/RXD1/PWM6/EINT3) are connected with 11 pin (D11), 12 pin (RO1) of serial port chip SP3232EEY in the serial communication module 10 respectively, 10 pin (D12) are connected with 9 pin (RO2), produce TXD0, RXD0, TXD1, RXD1 signal respectively; 23 pin (VCCB) of first SN74LVC4245DW chip respectively with 24 pin (VCCB), power module 1+the 3.3V output terminal, one end of capacitor C 133 connects, the other end of capacitor C 133 is connected with ground wire (GND), 1 pin (VCCA) of first bi-directional voltage converter SN74LVC4245DW chip respectively with power module 1+the 5V output terminal, one end of capacitor C 135 connects, the other end of capacitor C 135 is connected with ground wire (GND), 11～13 pin (GND) of first bi-directional voltage converter SN74LVC4245DW chip, 22 pin (/OE) all be connected to ground wire (GND), 3 pin (A1) are connected with 8 pin of exclusion PR110,1 pin of exclusion PR110 connects the SPI_MOSI_O signal end, 4 pin (A2) of first bi-directional voltage converter SN74LVC4245DW chip are connected with 7 pin of exclusion PR110,2 pin of exclusion PR110 connect the SPI_CLK_O signal end, 5 pin (A3) of first bi-directional voltage converter SN74LVC4245DW chip are connected with 6 pin of exclusion PR110,3 pin of exclusion PR110 connect the SPI_SC1_O signal end, 6 pin (A4) of first bi-directional voltage converter SN74LVC4245DW chip are connected with 5 pin of exclusion PR110,4 pin of exclusion PR110 connect the SPI_SC2_O signal end, 7 pin (A5) of first bi-directional voltage converter SN74LVC4245DW chip are connected with 8 pin of exclusion PR111,1 pin of exclusion PR111 connects the LDAC signal end, 8 pin (A6) of first bi-directional voltage converter SN74LVC4245DW chip are connected with 7 pin of exclusion PR111,2 pin of exclusion PR111 connect the AD_BUSY1 signal end, SPI_MOSI_O signal end wherein, the SPI_CLK_O signal end, the signal of SPI_SC1_O signal end and LDAC signal end outputs to first D/A modular converter 3, the SPI_MOSI_O signal end, the SPI_CLK_O signal end, the signal of SPI_SC2_O signal end and LDAC signal end outputs to second D/A modular converter 6, and the AD_BUSY1 signal end is accepted the AD_BUSY1 signal of A/D modular converter 9.23 pin (VCCB) of second SN74LVC4245DW chip respectively with 24 pin (VCCB), power module 1+the 3.3V output terminal, one end of capacitor C 121 connects, the other end of capacitor C 121 is connected with ground wire (GND), 1 pin (VCCA) of second bi-directional voltage converter SN74LVC4245DW chip respectively with power module 1+the 5V output terminal, one end of capacitor C 123 connects, the other end of capacitor C 123 is connected with ground wire (GND), 11～13 pin (GND) of second bi-directional voltage converter SN74LVC4245DW chip all are connected to ground wire (GND), 2 pin (DIR) connect power module 1+5V output terminal, 22 pin respectively with 2 pin (DIR) of the 3rd bi-directional voltage converter SN74LVC4245DW chip, 12 pin of chip ATF16V8B15PI, the AD_DATA signal end connects, 3～6 pin (A1～A4) be connected with 8～5 pin of exclusion PR100 respectively, 7～10 pin (A5～A8) be connected with 8～5 pin of exclusion PR102 respectively, 1～4 pin of exclusion PR100 connects AD0～AD3 data-signal end respectively, and 1～4 pin of exclusion PR102 connects AD4～AD7 data-signal end respectively.23 pin (VCCB) of the 3rd SN74LVC4245DW chip respectively with 24 pin (VCCB), power module 1+the 3.3V output terminal, one end of capacitor C 122 connects, the other end of capacitor C 122 is connected with ground wire (GND), 1 pin (VCCA) of the 3rd bi-directional voltage converter SN74LVC4245DW chip respectively with power module 1+the 5V output terminal, one end of capacitor C 124 connects, the other end of capacitor C 124 is connected with ground wire (GND), 11～13 pin (GND) of the 3rd bi-directional voltage converter SN74LVC4245DW chip all are connected to ground wire (GND), 2 pin (DIR) connect power module 1+5V output terminal, 22 pin (/OE) respectively with 2 pin (DIR) of second bi-directional voltage converter SN74LVC4245DW chip, the AD_DATA signal end connects, 3～6 pin (A1～A4) be connected with 8～5 pin of exclusion PR101 respectively, 7～10 pin (A5～A8) be connected with 8～5 pin of exclusion PR104 respectively, 1～4 pin of exclusion PR101 connects AD8～AD11 data-signal end respectively, 1～4 pin of exclusion PR104 connects AD12～AD15 data-signal end respectively, and the data-signal of reception A/D modular converter 9 (AD8～AD15).10 pin (GND) of GAL chip ATF16V8B15PI are connected to ground wire (GND), 20 pin (VCC) respectively with power module 1+the 5V output terminal, one end of capacitor C 127 connects, the other end of capacitor C 127 is connected with ground wire (GND), 12 pin (IO) of GAL chip ATF16V8B15PI are connected with 5 pin of exclusion PR106,4 pin of exclusion PR106 connect the AD_DATA signal end, 13 pin (IO) of GAL chip ATF16V8B15PI are connected with 6 pin of exclusion PR106,3 pin of exclusion PR106 connect the AD_CS1 signal end, 14 pin (IO) of GAL chip ATF16V8B15PI are connected with 7 pin of exclusion PR106,2 pin of exclusion PR106 connect the AD_RC1 signal end, AD_DATA signal end and second wherein, 22 pin of 3 SN74LVC4245DW chips connect, the AD_CS1 signal end, the signal of AD_RC1 signal end outputs to A/D modular converter 9.
As shown in Figure 3, first D/A modular converter 3 comprises first D/A conversion chip DAC8831ICD and first operational amplifier OP177FP.7 pin of first D/A conversion chip DAC8831ICD (/CS), 8 pin (SCLK), 10 pin (DIN) and 11 pin (/LDAC) is connected with the LDAC signal that produces of the SPI_SC1_O signal that produces of 5 pin of first bi-directional voltage converter SN74LVC4245DW chip, SPI_SCK_O signal that 4 pin produce, SPI_MOSI_O signal that 3 pin produce and 7 pin in the microprocessor module 2 respectively, produce D/A and change required sheet choosing, clock, input data signal and output enable signal.3 pin (AGNDF) of first D/A conversion chip DAC8831ICD, 4 pin (AGNDS) all are connected with ground wire (GND) with 12 pin (DGND), 14 pin (VDD) respectively with power module 1+the 5V output terminal, one end of capacitor C 214 connects, the other end of capacitor C 214 is connected with ground wire (GND), 5 pin (REFF) respectively with 6 pin (REFS), one end of capacitor C 213, one end of capacitor C 212 and power module 1+the 2.5V output terminal is connected, obtain conversion reference voltage, the other end of capacitor C 213 is connected with the other end of capacitor C 212, and be connected to ground wire (GND), 2 pin (OUT), 13 pin (INV) and 1 pin (RBF) respectively with 3 pin of first operational amplifier OP177FP, 2 pin are connected with 6 pin, realize voltage follow, 1 pin of first OP177FP chip is connected with an end of resistance R 205 through resistance, the other end of resistance R 205 is connected with 1 pin of adjustable resistance WR201,3 pin of adjustable resistance WR201 respectively with 7 pin of first operational amplifier OP177FP, power module 1+end of 5V output terminal and capacitor C 215 is connected, the other end of capacitor C 215 is connected with ground wire (GND), 2 pin of adjustable resistance WR201 are connected with an end of resistance R 206, the other end of resistance R 206 is connected with 8 pin of first operational amplifier OP177FP, 4 pin of first operational amplifier OP177FP respectively with power module 1-the 5V output terminal, one end of capacitor C 217 connects, the other end of capacitor C 217 is connected with ground wire (GND), 6 pin of first OP177FP chip are connected with an end of resistance R 207, one end of the other end of resistance R 207 and capacitor C 216, the output terminal VCI of first D/A modular converter 3 connects, and outputing to electronic load adjusting module 4, the other end of capacitor C 216 is connected with ground wire (GND).
As shown in Figure 4, electronic load adjusting module 4 is made of operational amplifier OPA445AP chip.The output VCI signal of first D/A modular converter 3 is connected with an end of resistance R 401, the other end of resistance R 401 is connected with 1 pin of adjustable resistance XR400,2 pin of adjustable resistance XR400 are connected with an end of resistance R 404, the other end of resistance R 404 is connected with ground wire (GND), 3 pin of adjustable resistance XR400 are connected with an end of resistance R 402, the other end of resistance R 402 is connected with 3 pin of operational amplifier OPA445AP chip, 2 pin of operational amplifier OPA445AP chip respectively with an end of resistance R 403, one end of capacitor C 403, one end of capacitor C 400, one end of capacitor C 401 connects, the other end of capacitor C 401 is connected with an end of resistance R 400, the other end of resistance R 400 respectively with the other end of capacitor C 400,6 pin of operational amplifier OPA445AP chip connect, the other end of resistance R 403 is connected with the other end of capacitor C 403, and be connected with the feedback signal CVI_BACK of electronic load output module 5 end, 7 pin of operational amplifier OPA445AP chip respectively with power module 1+end of 24V output terminal and capacitor C 402 is connected, the other end of capacitor C 402 is connected with ground wire (GND), 4 pin of operational amplifier OPA445AP chip and power module 1-end of 24V output terminal and capacitor C 404 is connected, the other end of capacitor C 404 is connected with ground wire (GND), 6 pin output voltages of operational amplifier OPA445AP chip are adjusted signal LOAD_V_Comp, and are connected to the LOAD_V_Comp end of electronic load output module 5.
As shown in Figure 5, electronic load output module 5 is made up of first NPN transistor 2N2222A, second NPN transistor 2N2222A, the 3rd NPN transistor 2N2222A, first NPN transistor 2N3440, first Darlington transistor TIP142, sampling resistor RS400 and operational amplifier OP27A.2 pin of first NPN transistor 2N2222A are connected with the output terminal LOAD_V_Comp of electronic load adjusting module 5,3 pin respectively with resistance R 411, one end of resistance R 414 and capacitor C 407 is connected, the other end of resistance R 414 is connected with the other end of capacitor C 407, and be connected to ground wire (GND), 1 pin of first NPN transistor 2N2222A is connected with an end of resistance R 406, the other end of resistance R 406 and power module 1+the 38V output terminal is connected, the other end of resistance R 411 is connected with 2 pin of second NPN transistor 2N2222A, 3 pin of second NPN transistor 2N2222A are connected with an end of resistance R 412,1 pin is connected with an end of resistance R 407, the other end of resistance R 407 and power module 1+the 38V output terminal is connected, the other end of resistance R 412 respectively with 2 pin of first NPN transistor 2N3440,1 pin of the 3rd NPN transistor 2N2222A is connected with an end of resistance R 413, the other end of resistance R 413 is connected with 3 pin of first NPN transistor 2N3440 and 1 pin of first Darlington transistor TIP142 respectively, 1 pin of first NPN transistor 2N3440 and power module 1+the 38V output terminal is connected, 3 pin of the 3rd NPN transistor 2N2222A are connected with ground wire (GND), 2 pin are connected with 1 pin of adjustable resistance WR400,2 pin of first Darlington transistor TIP142 are connected with an end of resistance R 405 and capacitor C 406 respectively, constitute the output terminal Load_IN of electronic load, resistance R 405 other ends are connected with an end of capacitor C 405, the other end of capacitor C 405 is connected with the other end of capacitor C 406, and be connected to ground wire (GND), 3 pin of first Darlington transistor TIP142 are connected with an end of resistance R 408, the other end of resistance R 408 respectively with 1 pin of sampling resistor RS400,2 pin of adjustable resistance WR400 are connected with 3 pin, 2 pin of sampling resistor RS400 are connected with ground wire (GND), 3 pin are connected with an end of resistance R 417,4 pin are connected with an end of resistance R 420, the other end of resistance R 417 respectively with an end of resistance R 415,2 pin of operational amplifier OP27A connect, the other end of resistance R 420 respectively with an end of resistance R 421,3 pin of operational amplifier OP27A connect, the other end of resistance R 421 is connected with ground wire (GND), the other end of resistance R 415 is connected with 6 pin of operational amplifier OP27A, 7 pin of operational amplifier OP27A respectively with end of capacitor C 408 and power module 1+the 15V output terminal is connected, the other end of capacitor C 408 is connected with ground wire (GND); 4 pin of operational amplifier OP27A respectively with end of capacitor C 409 and power module 1-the 15V output terminal is connected, the other end of capacitor C 409 is connected with ground wire (GND); The 6 pin output feedback signal CVI_BACK of operational amplifier OP27A are to electronic load adjusting module 4.
As shown in Figure 6, second D/A modular converter 3 comprises second D/A conversion chip DAC8831ICD and second operational amplifier OP177FP.7 pin of second D/A conversion chip DAC8831ICD (/CS), 8 pin (SCLK), 10 pin (DIN) and 11 pin (/LDAC) is connected with the LDAC signal that produces of the SPI_SC2_O signal that produces of 6 pin of first bi-directional voltage converter SN74LVC4245DW chip, SPI_SCK_O signal that 4 pin produce, SPI_MOSI_O signal that 3 pin produce and 7 pin in the microprocessor module 2 respectively, produce D/A and change required sheet choosing, clock, input data signal and output enable signal.3 pin (AGNDF) of second D/A conversion chip DAC8831ICD, 4 pin (AGNDS) all are connected with ground wire (GND) with 12 pin (DGND), 14 pin (VDD) respectively with power module 1+the 5V output terminal, one end of capacitor C 203 connects, the other end of capacitor C 203 is connected with ground wire (GND), 5 pin (REFF) respectively with 6 pin (REFS), one end of capacitor C 202, one end of capacitor C 201 and power module 1+the 2.5V output terminal is connected, obtain conversion reference voltage, the other end of capacitor C 202 is connected with the other end of capacitor C 201, and be connected to ground wire (GND), 2 pin (OUT), 13 pin (INV) and 1 pin (RBF) respectively with 3 pin of second operational amplifier OP177FP, 2 pin are connected with 6 pin, realize voltage follow, 1 pin of second OP177FP chip is connected with an end of resistance R 200 through resistance, the other end of resistance R 200 is connected with 1 pin of adjustable resistance WR200,3 pin of adjustable resistance WR200 respectively with 7 pin of second operational amplifier OP177FP, power module 1+end of 5V output terminal and capacitor C 204 is connected, the other end of capacitor C 204 is connected with ground wire (GND), 2 pin of adjustable resistance WR200 are connected with an end of resistance R 201, the other end of resistance R 201 is connected with 8 pin of second operational amplifier OP177FP, 4 pin of second operational amplifier OP177FP respectively with power module 1-the 5V output terminal, one end of capacitor C 206 connects, the other end of capacitor C 206 is connected with ground wire (GND), 6 pin of second OP177FP chip are connected with an end of resistance R 202, one end of the other end of resistance R 202 and capacitor C 205, the output terminal VCV of second D/A modular converter 3 connects, and outputing to offset supply adjusting module 7, the other end of capacitor C 205 is connected with ground wire (GND).
As shown in Figure 7, offset supply adjusting module 7 is made of the 3rd operational amplifier OP177FP.3 pin of the 3rd operational amplifier OP177FP are connected with an end of resistance R 301, and the other end of resistance R 301 is connected with the output terminal VCV of second D/A modular converter 6; 2 pin of the 3rd operational amplifier OP177FP are connected with an end of resistance R 302, capacitor C 301 and capacitor C 300 respectively, the other end of capacitor C 300 is connected with 6 pin of the 3rd operational amplifier OP177FP, the other end of capacitor C 301 is connected with an end of resistance R 300, and the other end of resistance R 300 is connected with 6 pin of the 3rd operational amplifier OP177FP; 7 pin of the 3rd operational amplifier OP177FP respectively with end of capacitor C 302 and power module 1+the 15V output terminal is connected, the other end of capacitor C 302 is connected with ground wire (GND); 4 pin of the 3rd operational amplifier OP177FP respectively with end of capacitor C 303 and power module 1-the 15V output terminal is connected, the other end of capacitor C 303 is connected with ground wire (GND); The other end of resistance R 302 is connected with the adjustment end of adjustable resistance XR300, the other end of adjustable resistance XR300, an end of resistance R 304 and an end of capacitor C 304 respectively, the 3rd end of adjustable resistance XR300 is connected with an end of resistance R 303, the other end of resistance R 303 is connected with ground wire (GND), the other end of resistance R 304 is connected with the other end of capacitor C 304, constitute the feedback end OutputHI of offset supply adjusting module 7, and be connected with the output terminal of offset supply output module 8; The 6 pin output of the 3rd operational amplifier OP177FP is adjusted signal V_Comp to offset supply output module 8.
As shown in Figure 8, offset supply output module 8 is made up of the 4th NPN transistor 2N2222A, the 5th NPN transistor 2N2222A, the 6th NPN transistor 2N2222A, second NPN transistor 2N3440, the 3rd NPN transistor 2N3440 and second Darlington transistor TIP142.2 pin of the 4th NPN transistor 2N2222A are connected with the output terminal V_Comp of offset supply adjusting module 7,3 pin respectively with resistance R 313, one end of resistance R 310 and capacitor C 315 is connected, the other end of resistance R 313 is connected with the other end of capacitor C 315, and be connected to ground wire (GND), 1 pin of the 4th NPN transistor 2N2222A is connected with an end of resistance R 305, the other end of resistance R 305 and power module 1+the 38V output terminal is connected, the other end of resistance R 310 is connected with 2 pin of the 5th NPN transistor 2N2222A, 3 pin of the 5th NPN transistor 2N2222A are connected with an end of resistance R 311,1 pin is connected with an end of resistance R 306, the other end of resistance R 306 and power module 1+the 38V output terminal is connected, the other end of resistance R 311 respectively with 2 pin of second NPN transistor 2N3440,1 pin of the 6th NPN transistor 2N2222A is connected with an end of resistance R 312, the other end of resistance R 312 is connected with 3 pin of second NPN transistor 2N3440 and 1 pin of second Darlington transistor TIP142 respectively, 1 pin of second NPN transistor 2N3440 and power module 1+the 38V output terminal is connected, 2 pin of second Darlington transistor TIP142 and power module 1+the 38V output terminal is connected, 3 pin are connected with an end of resistance R 307, the other end of resistance R 307 respectively with an end of resistance R 314,2 pin of adjustable resistance WR300 are connected with 3 pin, 1 pin of adjustable resistance WR300 is connected with 2 pin of the 6th NPN transistor 2N2222A, 3 pin of the 6th NPN transistor 2N2222A respectively with the other end of resistance R 314, one end of capacitor C 306, one end of capacitor C 307,1 pin of the 3rd NPN transistor 2N3440 connects, and be connected to the output terminal/feedback end OUTPUTHI that repays power supply output module 8, the other end of capacitor C 306 is connected with the other end of capacitor C 307, and be connected to ground wire (GND), 2 pin of the 3rd NPN transistor 2N3440 are connected with ground wire (GND), 3 pin are connected with 3 pin with 2 pin of adjustable resistance WR301,1 pin of adjustable resistance WR301 is connected with an end of resistance R 315, the other end of resistance R 315 and power module 1-the 15V output terminal is connected.
As shown in Figure 9, A/D modular converter 9 is made of A/D conversion chip ADS8505IBDB.1 pin (Vin) of ADS8505IBDB chip respectively with an end of resistance R 101, one end of resistance R 103 is connected with an end of capacitor C 106, the other end of resistance R 101 is connected with the output terminal/feedback end OUTPUTHI of offset supply output module 8, the other end of capacitor C 106 is connected with ground wire (GND), the other end of resistance R 103 is connected with 4 pin (CAP) of ADS8505IBDB chip and an end of capacitor C 108 respectively, the other end of capacitor C 108 is connected with ground wire (GND), 3 pin (REF) of ADS8505IBDB chip and an end of capacitor C 110 are connected, the other end of capacitor C 110 is connected with ground wire (GND), 2 pin (AGND) of ADS8505IBDB chip, 5 pin (AGND) all are connected with ground wire (GND) with 14 pin (DGND), 6～13 pin of ADS8505IBDB chip, 15～22 pin (D15～D0) be connected with the AD0～AD15 end of microprocessor module 2 respectively, 23 pin (BYTE) of ADS8505IBDB chip all are connected with ground wire (GND), 24 pin (R//C), 25 pin (/BUSY) and 26 pin (/CS) respectively with the AD_RC1 of microprocessor module 2 end, the AD_CS1 end is connected with the AD_BUSY1 end, 27 pin (Vana) of ADS8505IBDB chip respectively with an end of capacitor C 102, one end of capacitor C 103 and power module 1+the 5V output terminal is connected, the other end of capacitor C 102 is connected with the other end of capacitor C 103, and be connected to ground wire (GND), 28 pin (Vdig) respectively with an end of capacitor C 101, power module 1+connection of 5V output terminal, the other end of capacitor C 101 is connected with ground wire (GND).
As shown in figure 10, serial communication module 10 is made of serial port chip SP3232EEY.42 pin (P0.0/TXD0/PWM1) of the LPC2214 chip of microprocessor module 2,49 pin (P0.1/RXD0/PWM3/EINT0), 75 pin (P0.8/TXD1/PWM4) and 76 pin (P0.9/RXD1/PWM6/EINT3) respectively with 11 pin (D11) of serial port chip SP3232EEY, 12 pin (RO1) connect, 10 pin (D12) are connected with 9 pin (RO2), 1 pin of serial port chip SP3232EEY is connected with an end of capacitor C 141, the other end of capacitor C 141 is connected with 3 pin of serial port chip SP3232EEY, 4 pin of serial port chip SP3232EEY are connected with an end of capacitor C 142, the other end of capacitor C 142 is connected with 5 pin of serial port chip SP3232EEY, 2 pin of serial port chip SP3232EEY are connected with an end of capacitor C 144, the other end of capacitor C 144 respectively with 16 pin of serial port chip SP3232EEY, one end of capacitor C 143 and power module 1+the 3.3V output terminal is connected, the other end of capacitor C 143 is connected with ground wire (GND), 6 pin of serial port chip SP3232EEY are connected with an end of capacitor C 145, and the other end of capacitor C 145 is connected with ground wire (GND) with 15 pin of serial port chip SP3232EEY respectively.7 pin (DO2) of serial port chip SP3232EEY, 8 pin (RI2) difference output signal COMP_T and COMP_R are to the serial ports of PC, realize interconnection communication with PC, 14 pin (DO1) of serial port chip SP3232EEY, 13 pin (RI1) difference output signal HMI_T and HMI_R realize and other man-machine interface interconnection communication to the serial ports of man-machine interface.
The course of work of the present invention is as follows:
After connecting working power, power module 1 is other module for power supply of the electronic load device of band offset supply, microprocessor module 2 is finished hardware initialization work, by serial communication module 10, accepts electronic load adjustment order and power supply compensation order that host computer or other man-machine interface are provided with.
When carrying out the load adjustment, if loop current value that host computer is given, then microprocessor module 2 calculates the correspondent voltage setting value according to the sampling resistor value, by LPC2214 chip 70 pin, 59 pin and 68 pin are through bi-directional voltage converter SN74LVC4245DW chip, output to respectively first D/A conversion chip DAC8831ICD in first D/A modular converter 37 pin (/CS), 8 pin (SCLK) and 10 pin (DIN), produce the required sheet choosing of D/A conversion, clock and input data signal, output to 11 pin (LDAC) of first D/A conversion chip DAC8831ICD by 69 pin of LPC2214 chip, produce the output enable signal.After first D/A conversion chip DAC8831ICD receives that the conversion command of microprocessor module and pending data convert, output to 3 pin of first operational amplifier OP177FP from 2 pin (OUT) of first D/A conversion chip DAC8831ICD, realize voltage follow, 6 pin of first operational amplifier OP177FP output to electronic load adjusting module 4.Electronic load adjusting module 4 is according to the feedback voltage value of the acquisition on the sampling resistor in this setting value and the electronic load output module 5, adjust the output of electronic load output module 5 by electronic load adjusting module 4, equate with setting value up to value of feedback, finish adjustment process.
When carrying out the power supply compensation, offset according to the host computer setting, microprocessor module 2 is by LPC2214 chip 60 pin, 59 pin and 68 pin are through bi-directional voltage converter SN74LVC4245DW chip, output to respectively second D/A conversion chip DAC8831ICD in second D/A modular converter 67 pin (/CS), 8 pin (SCLK) and 10 pin (DIN), produce the required sheet choosing of D/A conversion, clock and input data signal, output to 11 pin (LDAC) of first D/A conversion chip DAC8831ICD by 69 pin of LPC2214 chip, produce the output enable signal.After second D/A conversion chip DAC8831ICD receives that the conversion command of microprocessor module 2 and pending data convert, output to 3 pin of second operational amplifier OP177FP from 2 pin (OUT) of second D/A conversion chip DAC8831ICD, realize voltage follow, 6 pin of second operational amplifier OP177FP output to offset supply adjusting module 7.Offset supply adjusting module 7 is according to the value of feedback in this setting value and the offset supply output module 8, and the output by offset supply adjusting module 7 adjustment offset supply output modules 8 equates with setting value up to value of feedback, finishes the offset supply adjustment process.
Value of feedback in the offset supply output module 8 is simultaneously by being sent to microprocessor module 2 after 9 conversions of A/D modular converter.(P3.5/A5～P3.8/A8), 35 pin (P3.25/CS2), 30 pin (P3.26/CS1), 29 pin (P3.27/WE) and 90 pin (P1.1/OE) incoming coded signal arrive 2～9 pin (input pin) of a slice GAL chip ATF16V8B15PI to 74～71 pin by the LPC2214 chip of microprocessor module 2, through 24 pin of 7 pin of GAL chip ATF16V8B15PI, A/D conversion chip ADS8505IBDB that 6 pin (output pin) output to A/D modular converter 9 (/R/C) and 25 pin (/CS), form A/D conversion required reading/changeover control signal and chip selection signal.Microprocessor module 2 is inquired about its 25 pin (P1.17/TRACEPKTI) again, when this pin is low level, A/D converts, the LPC2214 chip is by 98,105,106,108,109,114,115,116,117,118,120,124,125,127,129,130 pin (P2.15/D15～P2.0/D0) in the microprocessor module 2, (the A/D transformation result on the D15～D0) can be done the closed-loop control of offset supply output to read 6～13 pin, 15～22 pin of A/D conversion chip ADS8505IBDB.
In addition, serial communication module 10 has two serial ports passages, realization and PC interconnection, another is realized and the man-machine interface interconnection, no matter the therefore adjustment of electronic load or the adjustment of offset supply, both can pass through online setting of PC or modification, and also can realize manually being provided with or revising by man-machine interface.
Claims (1)
1. be with the program-controlled electronic load device of offset supply, comprise power module, microprocessor, a D/A modular converter, electronic load adjusting module, electronic load output module, the 2nd D/A modular converter, offset supply adjusting module, offset supply output module, A/D modular converter and serial communication module, it is characterized in that:
Described power module by a slice LM338 provide+24V, a slice LM333 provide-24V, a slice MC7815T provide+15V, a slice LM7915CT provide-15V, another sheet LM338 provide+5V, a slice MC7905T provide-5V, a slice SPX1117M-3.3 provide+3.3V, a slice LT1461AIS8-2.5 provide+2.5V, provided+the 38V power supply by rectifier bridge RS607, power module is other module for power supply respectively;
Described microprocessor module comprises LPC2214 chip, the first bi-directional voltage converter SN74LVC4245DW chip, the second bi-directional voltage converter SN74LVC4245DW chip, the 3rd bi-directional voltage converter SN74LVC4245DW chip and a slice GAL chip ATF16V8B15PI of PHILIP company; 25 pin of LPC2214 chip wherein, 69 pin, 70 pin, 60 pin, 59 pin and 68 pin respectively with 16 pin of the first bi-directional voltage converter SN74LVC4245DW chip, 17 pin, 18 pin, 19 pin, 20 pin are connected with 21 pin, 4 pin are connected with 2 pin of the first bi-directional voltage converter SN74LVC4245DW chip, 98 pin, 105 pin, 106 pin, 108 pin, 109 pin, 114 pin, 115 pin, 116 pin are connected with 21～14 pin of the second bi-directional voltage converter SN74LVC4245DW chip respectively, 117 pin, 118 pin, 120 pin, 124 pin, 125 pin, 127 pin, 129 pin, 130 pin are connected with 21～14 pin of the 3rd bi-directional voltage converter SN74LVC4245DW chip respectively, 90 pin, 74 pin, 73 pin, 72 pin, 71 pin, 35 pin, 30 pin, 29 pin are connected with the end of resistance R 151～R158 respectively, the other end of resistance R 151～R158 is connected with 2～9 pin of GAL chip ATF16V8B15PI respectively, 142 pin of LPC2214 chip respectively with the XTAL1 pin of crystal oscillator Y101, one end of resistance R 163, one end of capacitor C 158 connects, the other end of resistance R 163 respectively with 141 pin of LPC2214 chip, the XTAL2 pin of crystal oscillator Y101, one end of capacitor C 159 connects, the other end of capacitor C 158 is connected with the other end of capacitor C 159, and be connected to ground wire, 3 pin of LPC2214 chip, 9 pin, 26 pin, 38 pin, 54 pin, 67 pin, 79 pin, 93 pin, 103 pin, 107 pin, 111 pin, 128 pin, 138 pin, 139 pin all are connected to ground, 2 pin, 14 pin, 31 pin, 39 pin, 51 pin, 57 pin, 77 pin, 94 pin, 104 pin, 112 pin and 119 pin and power module+the 3.3V output terminal is connected, 13 pin are connected with an end of resistance R 191,16 pin are connected with an end of resistance R 192, the other end of resistance R 191 respectively with the other end of resistance R 192, power module+connection of 3.3V output terminal, 123 pin of LPC2214 chip are connected with an end of resistance R 136, the other end of resistance R 136 and power module+the 3.3V output terminal is connected; 42 pin of the LPC2214 chip of microprocessor module 2,49 pin, 75 pin and 76 pin are connected with 11 pin, 12 pin of serial port chip SP3232EEY in the serial communication module 10 respectively, 10 pin are connected with 9 pin, produce TXD0, RXD0, TXD1, RXD1 signal respectively; 23 pin of the one SN74LVC4245DW chip respectively with 24 pin, power module+the 3.3V output terminal, one end of capacitor C 133 connects, the other end of capacitor C 133 is connected with ground wire, 1 pin of the first bi-directional voltage converter SN74LVC4245DW chip respectively with power module+the 5V output terminal, one end of capacitor C 135 connects, the other end of capacitor C 135 is connected with ground, 11～13 pin of the first bi-directional voltage converter SN74LVC4245DW chip, 22 pin all are connected to ground, 3 pin are connected with 8 pin of exclusion PR110,1 pin of exclusion PR110 connects the SPI_MOSI_O signal end, 4 pin of the first bi-directional voltage converter SN74LVC4245DW chip are connected with 7 pin of exclusion PR110,2 pin of exclusion PR110 connect the SPI_CLK_O signal end, 5 pin of the first bi-directional voltage converter SN74LVC4245DW chip are connected with 6 pin of exclusion PR110,3 pin of exclusion PR110 connect the SPI_SC1_O signal end, 6 pin of the first bi-directional voltage converter SN74LVC4245DW chip are connected with 5 pin of exclusion PR110,4 pin of exclusion PR110 connect the SPI_SC2_O signal end, 7 pin of the first bi-directional voltage converter SN74LVC4245DW chip are connected with 8 pin of exclusion PR111,1 pin of exclusion PR111 connects the LDAC signal end, 8 pin of the first bi-directional voltage converter SN74LVC4245DW chip are connected with 7 pin of exclusion PR111,2 pin of exclusion PR111 connect the AD_BUSY1 signal end, SPI_MOSI_O signal end wherein, the SPI_CLK_O signal end, the signal of SPI_SC1_O signal end and LDAC signal end outputs to a D/A modular converter 3, the SPI_MOSI_O signal end, the SPI_CLK_O signal end, the signal of SPI_SC2_O signal end and LDAC signal end outputs to the 2nd D/A modular converter 6, and the AD_BUSY1 signal end is accepted the AD_BUSY1 signal of A/D modular converter 9; The 2nd SN74LVC4245DW chip 23 respectively with 24 pin, power module+the 3.3V output terminal, one end of capacitor C 121 connects, the other end of capacitor C 121 is connected with ground wire, 1 pin of the second bi-directional voltage converter SN74LVC4245DW chip respectively with power module+the 5V output terminal, one end of capacitor C 123 connects, the other end of capacitor C 123 is connected with ground wire, 11～13 pin of the second bi-directional voltage converter SN74LVC4245DW chip all are connected to ground wire, 2 pin connect power module+5V output terminal, 22 pin respectively with 2 pin of the 3rd bi-directional voltage converter SN74LVC4245DW chip, 12 pin of chip ATF16V8B15PI, the AD_DATA signal end connects, 3～6 pin are connected with 8～5 pin of exclusion PR100 respectively, 7～10 pin are connected with 8～5 pin of exclusion PR102 respectively, 1～4 pin of exclusion PR100 connects AD0～AD3 data-signal end respectively, and 1～4 pin of exclusion PR102 connects AD4～AD7 data-signal end respectively; 23 pin of Three S's N74LVC4245DW chip respectively with 24 pin, power module+the 3.3V output terminal, one end of capacitor C 122 connects, the other end of capacitor C 122 is connected with ground wire, 1 pin of the 3rd bi-directional voltage converter SN74LVC4245DW chip respectively with power module+the 5V output terminal, one end of capacitor C 124 connects, the other end of capacitor C 124 is connected with ground wire, 11～13 pin of the 3rd bi-directional voltage converter SN74LVC4245DW chip all are connected to ground wire, 2 pin connect power module+5V output terminal, 22 pin respectively with 2 pin of the second bi-directional voltage converter SN74LVC4245DW chip, the AD_DATA signal end connects, 3～6 pin are connected with 8～5 pin of exclusion PR101 respectively, 7～10 pin are connected with 8～5 pin of exclusion PR104 respectively, 1～4 pin of exclusion PR101 connects AD8～AD11 data-signal end respectively, 1～4 pin of exclusion PR104 connects AD12～AD15 data-signal end respectively, receives the data-signal of A/D modular converter 9; 10 pin of GAL chip ATF16V8B15PI are connected to ground wire, 20 pin respectively with power module+the 5V output terminal, one end of capacitor C 127 connects, the other end of capacitor C 127 is connected with ground wire, 12 pin of GAL chip ATF16V8B15PI are connected with 5 pin of exclusion PR106,4 pin of exclusion PR106 connect the AD_DATA signal end, 13 pin of GAL chip ATF16V8B15PI are connected with 6 pin of exclusion PR106,3 pin of exclusion PR106 connect the AD_CS1 signal end, 14 pin of GAL chip ATF16V8B15PI are connected with 7 pin of exclusion PR106,2 pin of exclusion PR106 connect the AD_RC1 signal end, AD_DATA signal end and second wherein, 22 pin of Three S's N74LVC4245DW chip connect, the AD_CS1 signal end, the signal of AD_RC1 signal end outputs to the A/D modular converter;
A described D/A modular converter comprises a D/A conversion chip DAC8831ICD and the first operational amplifier OP177FP; 7 pin of the one D/A conversion chip DAC8831ICD, 8 pin, 10 pin and 11 pin are connected with the LDAC signal that produces of the SPI_SC1_O signal that produces of 5 pin of the first bi-directional voltage converter SN74LVC4245DW chip, SPI_SCK_O signal that 4 pin produce, SPI_MOSI_O signal that 3 pin produce and 7 pin in the microprocessor module 2 respectively, produce D/A and change required sheet choosing, clock, input data signal and output enable signal; 3 pin of the one D/A conversion chip DAC8831ICD, 4 pin all are connected with ground wire with 12 pin, 14 pin respectively with power module+the 5V output terminal, one end of capacitor C 214 connects, the other end of capacitor C 214 is connected with ground wire, 5 pin respectively with 6 pin, one end of capacitor C 213, one end of capacitor C 212 and power module+the 2.5V output terminal is connected, obtain conversion reference voltage, the other end of capacitor C 213 is connected with the other end of capacitor C 212, and be connected to ground wire, 2 pin, 13 pin and 1 pin respectively with 3 pin of the first operational amplifier OP177FP, 2 pin are connected with 6 pin, realize voltage follow, 1 pin of the one OP177FP chip is connected with an end of resistance R 205 through resistance, the other end of resistance R 205 is connected with 1 pin of adjustable resistance WR201,3 pin of adjustable resistance WR201 respectively with 7 pin of the first operational amplifier OP177FP, power module+end of 5V output terminal and capacitor C 215 is connected, the other end of capacitor C 215 is connected with ground wire, 2 pin of adjustable resistance WR201 are connected with an end of resistance R 206, the other end of resistance R 206 is connected with 8 pin of the first operational amplifier OP177FP, 4 pin of the first operational amplifier OP177FP respectively with power module-the 5V output terminal, one end of capacitor C 217 connects, the other end of capacitor C 217 is connected with ground wire, 6 pin of the one OP177FP chip are connected with an end of resistance R 207, one end of the other end of resistance R 207 and capacitor C 216, the output terminal VCI of the one D/A modular converter connects, and outputing to the electronic load adjusting module, the other end of capacitor C 216 is connected with ground wire;
Described electronic load adjusting module is made of operational amplifier OPA445AP chip; The output VCI signal of the one D/A modular converter is connected with an end of resistance R 401, the other end of resistance R 401 is connected with 1 pin of adjustable resistance XR400,2 pin of adjustable resistance XR400 are connected with an end of resistance R 404, the other end of resistance R 404 is connected with ground wire, 3 pin of adjustable resistance XR400 are connected with an end of resistance R 402, the other end of resistance R 402 is connected with 3 pin of operational amplifier OPA445AP chip, 2 pin of operational amplifier OPA445AP chip respectively with an end of resistance R 403, one end of capacitor C 403, one end of capacitor C 400, one end of capacitor C 401 connects, the other end of capacitor C 401 is connected with an end of resistance R 400, the other end of resistance R 400 respectively with the other end of capacitor C 400,6 pin of operational amplifier OPA445AP chip connect, the other end of resistance R 403 is connected with the other end of capacitor C 403, and be connected with the feedback signal CVI_BACK of electronic load output module end, 7 pin of operational amplifier OPA445AP chip respectively with power module+end of 24V output terminal and capacitor C 402 is connected, the other end of capacitor C 402 is connected with ground wire, 4 pin of operational amplifier OPA445AP chip and power module-end of 24V output terminal and capacitor C 404 is connected, the other end of capacitor C 404 is connected with ground wire, 6 pin output voltages of operational amplifier OPA445AP chip are adjusted signal LOAD_V_Comp, and are connected to the LOAD_V_Comp end of electronic load output module;
Described electronic load output module is made up of the first NPN transistor 2N2222A, the second NPN transistor 2N2222A, the 3rd NPN transistor 2N2222A, the first NPN transistor 2N3440, the first Darlington transistor TIP142, sampling resistor RS400 and operational amplifier OP27A; 2 pin of the first NPN transistor 2N2222A are connected with the output terminal LOAD_V_Comp of electronic load adjusting module, 3 pin respectively with resistance R 411, one end of resistance R 414 and capacitor C 407 is connected, the other end of resistance R 414 is connected with the other end of capacitor C 407, and be connected to ground wire, 1 pin of the first NPN transistor 2N2222A is connected with an end of resistance R 406, the other end of resistance R 406 and power module+the 38V output terminal is connected, the other end of resistance R 411 is connected with 2 pin of the second NPN transistor 2N2222A, 3 pin of the second NPN transistor 2N2222A are connected with an end of resistance R 412,1 pin is connected with an end of resistance R 407, the other end of resistance R 407 and power module+the 38V output terminal is connected, the other end of resistance R 412 respectively with 2 pin of the first NPN transistor 2N3440,1 pin of the 3rd NPN transistor 2N2222A is connected with an end of resistance R 413, the other end of resistance R 413 is connected with 3 pin of the first NPN transistor 2N3440 and 1 pin of the first Darlington transistor TIP142 respectively, 1 pin of the first NPN transistor 2N3440 and power module+the 38V output terminal is connected, 3 pin of the 3rd NPN transistor 2N2222A are connected with ground wire, 2 pin are connected with 1 pin of adjustable resistance WR400,2 pin of the first Darlington transistor TIP142 are connected with an end of resistance R 405 and capacitor C 406 respectively, constitute the output terminal Load_IN of electronic load, resistance R 405 other ends are connected with an end of capacitor C 405, the other end of capacitor C 405 is connected with the other end of capacitor C 406, and be connected to ground wire, 3 pin of the first Darlington transistor TIP142 are connected with an end of resistance R 408, the other end of resistance R 408 respectively with 1 pin of sampling resistor RS400,2 pin of adjustable resistance WR400 are connected with 3 pin, 2 pin of sampling resistor RS400 are connected with ground wire, 3 pin are connected with an end of resistance R 417,4 pin are connected with an end of resistance R 420, the other end of resistance R 417 respectively with an end of resistance R 415,2 pin of operational amplifier OP27A connect, the other end of resistance R 420 respectively with an end of resistance R 421,3 pin of operational amplifier OP27A connect, the other end of resistance R 421 is connected with ground wire, the other end of resistance R 415 is connected with 6 pin of operational amplifier OP27A, 7 pin of operational amplifier OP27A respectively with end of capacitor C 408 and power module+the 15V output terminal is connected, the other end of capacitor C 408 is connected with ground wire; 4 pin of operational amplifier OP27A respectively with end of capacitor C 409 and power module-the 15V output terminal is connected, the other end of capacitor C 409 is connected with ground wire; The 6 pin output feedback signal CVI_BACK of operational amplifier OP27A are to the electronic load adjusting module;
Described the 2nd D/A modular converter comprises the 2nd D/A conversion chip DAC8831ICD and the second operational amplifier OP177FP; 7 pin of the 2nd D/A conversion chip DAC8831ICD, 8 pin, 10 pin and 11 pin are connected with the LDAC signal that produces of the SPI_SC2_O signal that produces of 6 pin of the first bi-directional voltage converter SN74LVC4245DW chip, SPI_SCK_O signal that 4 pin produce, SPI_MOSI_O signal that 3 pin produce and 7 pin in the microprocessor module respectively, produce D/A and change required sheet choosing, clock, input data signal and output enable signal; 3 pin of the 2nd D/A conversion chip DAC8831ICD, 4 pin all are connected with ground wire with 12 pin, 14 pin respectively with power module+the 5V output terminal, one end of capacitor C 203 connects, the other end of capacitor C 203 is connected with ground wire, 5 pin respectively with 6 pin, one end of capacitor C 202, one end of capacitor C 201 and power module+the 2.5V output terminal is connected, obtain conversion reference voltage, the other end of capacitor C 202 is connected with the other end of capacitor C 201, and be connected to ground wire, 2 pin, 13 pin and 1 pin respectively with 3 pin of the second operational amplifier OP177FP, 2 pin are connected with 6 pin, realize voltage follow, 1 pin of the 2nd OP177FP chip is connected with an end of resistance R 200 through resistance, the other end of resistance R 200 is connected with 1 pin of adjustable resistance WR200,3 pin of adjustable resistance WR200 respectively with 7 pin of the second operational amplifier OP177FP, power module+end of 5V output terminal and capacitor C 204 is connected, the other end of capacitor C 204 is connected with ground wire, 2 pin of adjustable resistance WR200 are connected with an end of resistance R 201, the other end of resistance R 201 is connected with 8 pin of the second operational amplifier OP177FP, 4 pin of the second operational amplifier OP177FP respectively with power module-the 5V output terminal, one end of capacitor C 206 connects, the other end of capacitor C 206 is connected with ground wire, 6 pin of the 2nd OP177FP chip are connected with an end of resistance R 202, one end of the other end of resistance R 202 and capacitor C 205, the output terminal VCV of the 2nd D/A modular converter 3 connects, and outputing to offset supply adjusting module 7, the other end of capacitor C 205 is connected with ground wire;
Described offset supply adjusting module is made of the 3rd operational amplifier OP177FP; 3 pin of the 3rd operational amplifier OP177FP are connected with an end of resistance R 301, and the other end of resistance R 301 is connected with the output terminal VCV of the 2nd D/A modular converter 6; 2 pin of the 3rd operational amplifier OP177FP are connected with an end of resistance R 302, capacitor C 301 and capacitor C 300 respectively, the other end of capacitor C 300 is connected with 6 pin of the 3rd operational amplifier OP177FP, the other end of capacitor C 301 is connected with an end of resistance R 300, and the other end of resistance R 300 is connected with 6 pin of the 3rd operational amplifier OP177FP; 7 pin of the 3rd operational amplifier OP177FP respectively with end of capacitor C 302 and power module+the 15V output terminal is connected, the other end of capacitor C 302 is connected with ground wire; 4 pin of the 3rd operational amplifier OP177FP respectively with end of capacitor C 303 and power module-the 15V output terminal is connected, the other end of capacitor C 303 is connected with ground wire; The other end of resistance R 302 is connected with the adjustment end of adjustable resistance XR300, the other end of adjustable resistance XR300, an end of resistance R 304 and an end of capacitor C 304 respectively, the 3rd end of adjustable resistance XR300 is connected with an end of resistance R 303, the other end of resistance R 303 is connected with ground wire, the other end of resistance R 304 is connected with the other end of capacitor C 304, constitute the feedback end OutputHI of offset supply adjusting module, and be connected with the output terminal of offset supply output module; The 6 pin output of the 3rd operational amplifier OP177FP is adjusted signal V_Comp to the offset supply output module;
Described offset supply output module is made up of the 4th NPN transistor 2N2222A, the 5th NPN transistor 2N2222A, the 6th NPN transistor 2N2222A, the second NPN transistor 2N3440, the 3rd NPN transistor 2N3440 and the second Darlington transistor TIP142; 2 pin of the 4th NPN transistor 2N2222A are connected with the output terminal V_Comp of offset supply adjusting module, 3 pin respectively with resistance R 313, one end of resistance R 310 and capacitor C 315 is connected, the other end of resistance R 313 is connected with the other end of capacitor C 315, and be connected to ground wire, 1 pin of the 4th NPN transistor 2N2222A is connected with an end of resistance R 305, the other end of resistance R 305 and power module+the 38V output terminal is connected, the other end of resistance R 310 is connected with 2 pin of the 5th NPN transistor 2N2222A, 3 pin of the 5th NPN transistor 2N2222A are connected with an end of resistance R 311,1 pin is connected with an end of resistance R 306, the other end of resistance R 306 and power module+the 38V output terminal is connected, the other end of resistance R 311 respectively with 2 pin of the second NPN transistor 2N3440,1 pin of the 6th NPN transistor 2N2222A is connected with an end of resistance R 312, the other end of resistance R 312 is connected with 3 pin of the second NPN transistor 2N3440 and 1 pin of the second Darlington transistor TIP142 respectively, 1 pin of the second NPN transistor 2N3440 and power module+the 38V output terminal is connected, 2 pin of the second Darlington transistor TIP142 and power module+the 38V output terminal is connected, 3 pin are connected with an end of resistance R 307, the other end of resistance R 307 respectively with an end of resistance R 314,2 pin of adjustable resistance WR300 are connected with 3 pin, 1 pin of adjustable resistance WR300 is connected with 2 pin of the 6th NPN transistor 2N2222A, 3 pin of the 6th NPN transistor 2N2222A respectively with the other end of resistance R 314, one end of capacitor C 306, one end of capacitor C 307,1 pin of the 3rd NPN transistor 2N3440 connects, and be connected to the output terminal/feedback end OUTPUTHI that repays the power supply output module, the other end of capacitor C 306 is connected with the other end of capacitor C 307, and be connected to ground wire, 2 pin of the 3rd NPN transistor 2N3440 are connected with ground wire, 3 pin are connected with 3 pin with 2 pin of adjustable resistance WR301,1 pin of adjustable resistance WR301 is connected with an end of resistance R 315, the other end of resistance R 315 and power module-the 15V output terminal is connected;
Described A/D modular converter is made of A/D conversion chip ADS8505IBDB; 1 pin of ADS8505IBDB chip respectively with an end of resistance R 101, one end of resistance R 103 is connected with an end of capacitor C 106, the other end of resistance R 101 is connected with the output terminal/feedback end OUTPUTHI of offset supply output module 8, the other end of capacitor C 106 is connected with ground wire, the other end of resistance R 103 is connected with 4 pin of ADS8505IBDB chip and an end of capacitor C 108 respectively, the other end of capacitor C 108 is connected with ground wire, 3 pin of ADS8505IBDB chip are connected with an end of capacitor C 110, the other end of capacitor C 110 is connected with ground wire, 2 pin of ADS8505IBDB chip, 5 pin all are connected with ground wire with 14 pin, 6～13 pin of ADS8505IBDB chip, 15～22 pin are connected with the AD0～AD15 end of microprocessor module respectively, 23 pin of ADS8505IBDB chip all are connected with ground wire, 24 pin, 25 pin and 26 pin respectively with the AD_RC1 of microprocessor module 2 end, the AD_CS1 end is connected with the AD_BUSY1 end, 27 pin of ADS8505IBDB chip respectively with an end of capacitor C 102, one end of capacitor C 103 and power module+the 5V output terminal is connected, the other end of capacitor C 102 is connected with the other end of capacitor C 103, and be connected to ground wire, 28 pin respectively with an end of capacitor C 101, power module+connection of 5V output terminal, the other end of capacitor C 101 is connected with ground wire;
Described serial communication module is made of serial port chip SP3232EEY; 42 pin of the LPC2214 chip of microprocessor module, 49 pin, 75 pin and 76 pin respectively with 11 pin of serial port chip SP3232EEY, 12 pin connect, 10 pin are connected with 9 pin, 1 pin of serial port chip SP3232EEY is connected with an end of capacitor C 141, the other end of capacitor C 141 is connected with 3 pin of serial port chip SP3232EEY, 4 pin of serial port chip SP3232EEY are connected with an end of capacitor C 142, the other end of capacitor C 142 is connected with 5 pin of serial port chip SP3232EEY, 2 pin of serial port chip SP3232EEY are connected with an end of capacitor C 144, the other end of capacitor C 144 respectively with 16 pin of serial port chip SP3232EEY, one end of capacitor C 143 and power module+the 3.3V output terminal is connected, the other end of capacitor C 143 is connected with ground wire, 6 pin of serial port chip SP3232EEY are connected with an end of capacitor C 145, and the other end of capacitor C 145 is connected with ground wire with 15 pin of serial port chip SP3232EEY respectively; 7 pin of serial port chip SP3232EEY, 8 pin difference output signal COMP_T and COMP_R realize and the interconnection communication of PC that to the serial ports of PC 14 pin of serial port chip SP3232EEY, 13 pin difference output signal HMI_T and HMI_R are to the serial ports of man-machine interface.
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| CN106501136A (en) * | 2016-11-23 | 2017-03-15 | 西南大学 | A kind of Acquisition Circuit system of compound ion electrode electromotive force and acquisition method |
| CN109765502A (en) * | 2019-03-13 | 2019-05-17 | 哈尔滨工业大学 | A kind of program-controlled DC Electronic Loads |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
| CN110967548A (en) * | 2018-09-29 | 2020-04-07 | 株洲中车时代电气股份有限公司 | Program-controlled variable resistor device with current detection function and working method |
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| CN1368644A (en) * | 2001-02-05 | 2002-09-11 | 计测技术研究所 | Electronic load device |
| JP2005224047A (en) * | 2004-02-06 | 2005-08-18 | Nec Corp | Method of detecting service life and device of monitoring service life of auxiliary power supply of back-up power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106501136A (en) * | 2016-11-23 | 2017-03-15 | 西南大学 | A kind of Acquisition Circuit system of compound ion electrode electromotive force and acquisition method |
| CN106501136B (en) * | 2016-11-23 | 2023-10-03 | 西南大学 | Acquisition circuit system and acquisition method for composite ion electrode electromotive force |
| CN110967548A (en) * | 2018-09-29 | 2020-04-07 | 株洲中车时代电气股份有限公司 | Program-controlled variable resistor device with current detection function and working method |
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| CN109765502B (en) * | 2019-03-13 | 2020-12-01 | 哈尔滨工业大学 | Program-controlled direct current electronic load |
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