CN201926677U - Program control electronic load device with compensation power supply - Google Patents

Abstract

The utility model relates to a program control electronic load device with a compensation power supply. The existing electronic load device has low resolution and low automaticity. In the program control electronic load device with the compensation power supply, a microprocessor module is connected with a first D/A (digital/analogue) conversion module, an electronic load adjusting module and an electronic load output module to form an electronic load capable of being adjusted by program control. The microprocessor module is connected with a second D/A (digital/analogue) conversion module, a compensation power supply adjusting module, a compensation power supply output module and an A/D (analogue/digital) conversion module to form an electronic load compensation power supply with a closed ring capable of being adjusted by program control. The microprocessor module is connected with a serial port communication module to realize the communication of an upper computer and other central processing units (CPU). The program control electronic load device with the compensation power supply utilizes a Darlington pipe which has the characteristics of rapid response, good stability, small power consumption, low noise and long life, so that the electronic load device with the compensation power supply has no mechanical contact and moving parts, and has rapid response, high sensitivity, low noise, long life and reliable performance.

Description

A kind of program-controlled electronic load device with offset supply

Technical field

The utility model belongs to the electric detective technology field, relates to a kind of electronic load device with offset supply, is mainly used in the I-V Characteristics Detection of sun power cell and solar module.

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

The purpose of this utility model just provides a kind of program-controlled electronic load device with offset supply.

A kind of program-controlled electronic load device with offset supply comprises 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.

First signal output part of microprocessor module is connected with the signal input part of a D/A modular converter, the signal output part of the one D/A modular converter is connected with electronic load adjusting module signal input part, and electronic load adjusting module signal output part is connected with electronic load output module signal input part; The one D/A modular converter, electronic load adjusting module and electronic load output module constitute the electronic load of program-controlled adjustment.

The secondary signal output terminal of microprocessor module is connected with the signal input part of the 2nd D/A modular converter, the signal output part of the 2nd D/A modular converter is connected with offset supply adjusting module signal input part, and offset supply adjusting module signal output part is connected with offset supply output module signal input part; Offset supply output module signal output part is connected with A/D modular converter signal input part, and A/D modular converter signal output part is connected with the signal input part of microprocessor module; The 2nd D/A modular converter, offset supply adjusting module, offset supply output module and A/D modular converter, the electronic load offset supply of formation closed loop, program-controlled adjustment;

Described microprocessor module also is connected with the serial communication module;

Described power module is connected respectively with other module, is other module for power supply.

Principle of work of the present utility model: connect working power, microprocessor module is finished hardware initialization work.Microprocessor module is accepted the electronic load adjustment order that PC issues by serial ports, adjust voltage to the electronic load output module by a D/A modular converter and the output of electronic load adjusting module, flow through after the sampling resistor sampling in module of the current value of electronic load output module, feed back to the electronic load adjusting module and constitute close loop control circuit.Microprocessor module is accepted the offset supply adjustment order that PC issues by serial ports, adjust voltage to the offset supply output module by the 2nd D/A modular converter and the output of offset supply adjusting module, through the A/D modular converter, feed back to microprocessor module and constitute close loop control circuit again.Microprocessor module is connected with the serial communication module, both can accept the control command of host computer and return corresponding control result, and can with the communication of other CPU, as dispose corresponding man-machine interface.

The utility model utilizes Darlington transistor not have characteristics such as mechanical contact, response speed are fast, good stability, power consumption is little, noise is low, the life-span is long, the electronic load that employing is made up of Darlington transistor, and, realized a kind of program-controlled electronic load device of quick, simple, reliable, long-life band offset supply in conjunction with microprocessor module and accessory power supply.

Description of drawings

Fig. 1 is the utility model theory structure synoptic diagram.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1, the program-controlled electronic load device of band offset supply comprises power module 1, microprocessor module 2, a D/A modular converter 3, electronic load adjusting module 4, electronic load output module 5, the 2nd 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 compositions.

Power module 2 is connected respectively with other module, is other module for power supply.Microprocessor module 2 adopts the LPC2214 chip of PHILIP company, and the work dominant frequency is 11.0592MHz, and operating voltage is+3.3V.Microprocessor module 2 is connected with a D/A modular converter 3, the one D/A modular converter 3 is connected with electronic load adjusting module 4, electronic load adjusting module 4 and 5 interconnection of electronic load output module, constitute the electronic load of program-controlled adjustment, the output valve of electronic load output module 5 feeds back to electronic load adjusting module 4.Microprocessor module 2 is connected with the 2nd D/A modular converter 6, the 2nd D/A modular converter 6 is connected with offset supply adjusting module 7, offset supply adjusting module 7 and 8 interconnection of offset supply output module, offset supply output module 8 is connected with A/D modular converter 9, A/D modular converter 9 is connected with microprocessor module 2, constitutes the electronic load offset supply of closed loop, program-controlled adjustment.Microprocessor module 2 and 10 interconnection of serial communication module are accepted the PC control order, passback control result.The baud rate of serial communication module setting is 9600bps～115200 bps.

In the present embodiment, a D/A modular converter 3 and the 2nd D/A modular converter 6 all adopt DAC8831 chip, electronic load adjusting module 4 to adopt OPA445 chip, electronic load output module 5 and offset supply output module 8 to adopt TIP142 Darlington transistor, offset supply adjusting module 7 to adopt OP177 chip, A/D modular converter 9 to adopt ADS8505 chip and serial communication module 10 to adopt the MAX232 chip.

Claims (1)

1. program-controlled electronic load device with offset supply, comprise 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, it is characterized in that:

First signal output part of microprocessor module is connected with the signal input part of a D/A modular converter, the signal output part of the one D/A modular converter is connected with electronic load adjusting module signal input part, and electronic load adjusting module signal output part is connected with electronic load output module signal input part; The one D/A modular converter, electronic load adjusting module and electronic load output module constitute the electronic load of program-controlled adjustment;

The secondary signal output terminal of microprocessor module is connected with the signal input part of the 2nd D/A modular converter, the signal output part of the 2nd D/A modular converter is connected with offset supply adjusting module signal input part, and offset supply adjusting module signal output part is connected with offset supply output module signal input part; Offset supply output module signal output part is connected with A/D modular converter signal input part, and A/D modular converter signal output part is connected with the signal input part of microprocessor module; The 2nd D/A modular converter, offset supply adjusting module, offset supply output module and A/D modular converter, the electronic load offset supply of formation closed loop, program-controlled adjustment;

Described microprocessor module also is connected with the serial communication module;

Described power module is connected respectively with other module, is other module for power supply.