CN209690456U - A thermoelectric power generation test bench - Google Patents

Abstract

The utility model discloses a thermoelectric power generation test bench, which comprises a cold source module, a heat source module, an induced draft fan, and a heating box; the cold source module and the heat source module are hollow tubular modules; the cross section of the heat source module is square, and the cross section of the cold source module is Rectangular, the long side of the rectangular section of the cold source module is equal to the side length of the square section of the heat source module; the cold source module and the heat source module can be aligned to clamp and fix the thermoelectric sheet. The utility model can freely set the number of cold sources and the positions arranged around the heat source according to the purpose of the test. The utility model has a simple structure and is convenient to disassemble; the utility model can simulate a variety of hot-end heating and cold-end heat dissipation methods, and the operation is simple and convenient , to avoid the technical shortcomings of the heat source and cold source structures of the thermoelectric power generation test bench in the prior art being fixed, and the working conditions that can be tested are limited, so it is convenient to popularize and use in the laboratory.

Description

A thermoelectric power generation test bench

technical field

The utility model belongs to the technical field of thermoelectric power generation, in particular to a thermoelectric power generation test bench.

Background technique

Thermoelectric sheets are different from photovoltaic panels. Not only are their physical properties not directly marked by the manufacturer, but their internal resistance always changes with external factors. Their performance parameters are not clear, which directly affects the conversion of heat energy into electrical energy. Conversion efficiency.

The current application of thermoelectric sheets is mostly exposed to the outdoors. For example, in the combination of photovoltaic panels, hot air is the heat source, and the cold source can dissipate heat or water circulation; at the exhaust end of the car, the heat source is high-temperature exhaust waste heat, and the cold source is external convective air; On high-temperature boilers, the heat source is high-temperature steam or even high-temperature molten iron, and the cold source is the natural temperature of air, etc. There is also a human body temperature difference generator, which is mostly used in self-produced and self-powered electronic devices. The heat source is the surface temperature of the human body, and the cold source is a liquefaction refrigeration device. . Therefore, there are many external working conditions of thermoelectric power generation sheets, and an ideal electrical model must not be used, or a unified working condition model should be used to cover other types.

At present, there are few test devices on the market that directly measure the performance parameters of thermoelectric power generation, and the structure of the cold source is mostly fixed, which cannot simulate the working mode of the thermoelectric power generation test device under various working conditions, which is not conducive to exploring the physical and electrical characteristics of the thermoelectric sheet, so it is inconvenient Promote use in the laboratory.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a thermoelectric power generation test bench suitable for collecting and studying the electrical and physical properties of thermoelectric sheets under various working conditions.

For realizing above-mentioned technical purpose, the technical scheme that the utility model takes is as follows:

A thermoelectric power generation test bench is provided, including a cold source module, a heat source module, an induced draft fan, and a heating box; the cold source module and the heat source module are hollow tubular modules; the cross section of the heat source module is square, and the cold source module The cross section is rectangular, and the long side of the rectangular cross section of the cold source module is equal to the square side of the cross section of the heat source module;

The test bench also includes a fixed support module and a first clamping module and a second clamping module, the first clamping module and the second clamping module are arranged at both ends of the fixed support module and can be adjusted and fixed , for aligning and clamping the cold source module and the heat source module; when the cold source module and the heat source module are clamped and fixed by the fixed support module, the first clamping module and the second clamping module, the cold source module and the heat source At least one thermoelectric chip can be sandwiched between the modules;

A hot air passage is arranged between the heating box and the heat source module, and an induced draft fan is arranged at the other end of the heating box.

Further, it also includes at least two side baffles, the size of the side baffles is larger than the rectangular cross-sectional area of the tubular cold source module and can be clamped and fixed on the two rectangular end faces of the tubular cold source module for water cooling and heat dissipation. Prevent cold water from flowing out from the side of the cold source module.

Further, threaded through holes are opened at both ends of one side of the cold source module along the length direction of the pipe body, and the threaded through holes are respectively used for sealing and fixed connection with the cold source pipe and the outlet pipe.

Further, a groove is provided on the opposite inner surface of the position where the thermoelectric sheet is sandwiched between the heat source module and the cold source module, for accommodating thermocouples embedded in the groove to measure the temperature of the hot and cold ends of the thermoelectric sheet.

Further, connect the side of the duct connected to the induced draft fan to a pressure transmitter to measure the flow rate of gas or liquid.

Further, several thermocouple wires are connected to the digital-to-analog converter interface.

Further, the positive and negative terminals at both ends of the thermoelectric unit are led out through the wire poles, and connected to the interface of the digital-to-analog converter through the rectangular plug connector.

In order to simulate the effects of different MPPTs in thermoelectric power generation, further, the test bench also includes a data acquisition system, which includes a voltage sensor, a pressure transmitter, a current sensor, an analog input module, and a The digital-to-analog converter of the dual wire and the host computer, the analog quantities measured by the voltage sensor, pressure transmitter and current sensor are connected to the analog input module and transmitted to the host computer.

The test bench also includes a load control module, through which the access of the load is controlled to perform open-circuit and closed-circuit tests.

In order to simulate a distributed power supply, further, several thermoelectric sheets are combined in different series to form multiple thermoelectric units, and each thermoelectric unit is equipped with an energy management system to maintain the maximum power of each thermoelectric unit in real time. It also includes a DC-DC step-up converter, the switching tube of the DC-DC step-up converter is connected with an MPPT controller, and the PWM wave sent by it controls the input voltage to reach the maximum power point.

The beneficial effects achieved by the utility model:

1. The utility model can set the number and position of the cold source modules fixed around the heat source module according to the needs, and simulate a variety of hot end heating and cold end heat dissipation methods. The operation is simple and convenient, and the thermoelectric power generation test bench in the prior art is avoided. The structure of the heat source and cold source is fixed, and the working conditions that can be tested are limited, so it is easy to promote and use in the laboratory;

2. In the utility model, when the heat source and the cold source are fixed, a fixed support module, a first clamping module and a second clamping module are designed to fix the cold source module and the heat source module, and a thermoelectric sheet, so that the thermoelectric sheet is in closer contact with the hot and cold ends, and the conversion efficiency is higher; and the number of cold sources and the location around the heat source can be set arbitrarily according to the purpose of the test. The utility model has a simple structure and is convenient to disassemble;

3. The utility model places thermocouples by setting grooves similar in size to the thermocouples on the cold end and hot end modules, so that the temperature at both ends of the thermoelectric sheet can be measured more accurately, and there is no need to connect other external devices for fixing the thermocouples. Simple and easy to implement;

4. The utility model explores the physical and electrical characteristics of the thermoelectric sheet through data collection, constructs a variety of thermoelectric sheet models, and can simulate and test which MPPT algorithm is better and more efficient for use in various complex working conditions. thermoelectric power generation;

5. The principle structure and test method of this utility model are original in China. Its test principle involves thermal and electrical engineering, and is a comprehensive test in the true sense. It is different from the conventional single thermoelectric test device to explore the physical characteristics of thermoelectric sheets. Considering many real-world applications.

Description of drawings

Fig. 1 is the overall model schematic diagram of the specific embodiment of the utility model;

Fig. 2 is a schematic diagram of fixing the cold source module and the heat source module of the specific embodiment of the utility model;

Fig. 3 is a schematic structural view of the cold source module of a specific embodiment of the present invention in a water-cooled manner;

Fig. 4 is the structural representation that thermocouple temperature measurement is set in the specific embodiment of the utility model;

Fig. 5 is another embodiment of the utility model to set the structural representation of thermocouple temperature measurement;

Fig. 6 is a schematic diagram of the connection structure of the utility model rectangular plug connector;

Fig. 7 is a schematic structural view of a specific embodiment of the utility model;

Fig. 8 is a logical block diagram of a distributed power supply according to a specific embodiment of the utility model;

Fig. 9 is a structural block diagram of an MPPT controller and a DC-DC boost converter in a specific embodiment of the present invention;

Markings in Figures 1 to 9: 1-heat source module; 2-cold source module; 3-thermocouple; 4-thermoelectric sheet; 5-induced fan; 6-heating box; -thermocouple wire; 10-cold water pipe; 11-water storage tank; 12-first threaded through hole; 13-second threaded through hole; 14-hot air pipeline; 15-fixed support module; 16-first clamping module 17-second clamping module; 18-side partition; 19-thermocouple wire; 20-host computer; 21-load control module; 22-analog input module; 23-rectangular plug connector.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

Embodiment 1: As shown in Figure 1, a thermoelectric power generation test bench is provided, including a cold source module 2, a heat source module 1, an induced draft fan 5, and a heating box 6; the cold source module 2 and the heat source module 1 are hollow tubular modules; The cross-section of the heat source module 1 is a square, the cross-section of the cold source module 2 is a rectangle, and the long side of the cross-section of the cold source module 2 is equal to the side length of the square of the cross-section of the heat source module 1;

The test bench also includes a fixed support module 15 and a first clamping module 16 and a second clamping module 17, the first clamping module 16 and the second clamping module 17 are arranged at both ends of the fixed support module 15 and All can be adjusted and fixed, and are used to align and clamp the cold source module 2 and the heat source module 1 (not shown in FIG. 1 , see embodiment 2 for the implementation method);

In this embodiment, the square cross-sectional area of the heat source module 1 is 50×50 mm, and the wall thickness is 2 mm. The long side of the rectangular cross-section of the cold source module 2 is also 50 mm, and the width is 30 mm. The purpose of the long side of the cross-section rectangle of the cold source module 2 being equal to the side length of the square cross-section of the heat source module 1 is to simulate different working conditions by fixing up to four cold sources around the heat source according to the test requirements during the test.

In the embodiment in FIG. 1 , two identical cold source modules 2 are fixed on the upper and lower symmetrical sides of the heat source module 1 on the thermoelectric power generation test bench. When the heat source module 1 and the cold source module 2 are fixed, the thermoelectric sheets 4 are clamped between the heat source module 1 and the cold source module 2, arranged in sequence along the heat source outlet direction, preferably the thermoelectric sheets 4 are arranged equidistantly , and its number can be set as required. In this embodiment, four pieces are arranged up and down, a total of 8 pieces. In other embodiments, when the cold source modules 2 are fixed around the hot end module, that is, four cold source modules 2 are fixed, the There are thermoelectric sheets 4 sandwiched around the heat source module 1 and between the cold source module 2, for example, 8 sheets are arranged on each side, a total of 32 sheets, preferably equidistantly arranged.

The thermoelectric sheet 4 is the thermoelectric sheet 4 of TG12-6-024 model produced by Marlow Industries. The overall size is: cold side 40*40mm, hot side 40*44mm, thickness 3.3mm.

In this embodiment, the heating box 6 is used to heat the air, and the induced draft fan 5 is equipped to blow the hot air into the hollow channel of the hot end module through the hot air channel to heat the hot end. A hot air pipeline 14 is arranged between the heating box and the heat source module. In order to improve the safety and effectiveness of the control of the induced draft fan 5 and the heating box 6, a power distribution box can be added to realize the management and control of the power supply.

In a specific embodiment, considering the situation of simulating the flow velocity of the outside air, the flow velocity of the air can be controlled by adjusting the power of the induced draft fan 5. Preferably, a pressure transmitter can be arranged at the outlet end of the hot end module for real-time measurement The size of the hot air velocity.

In this embodiment, the cooling source uses natural cold air to dissipate heat. In other embodiments, a cooling fan can also be installed on the surface of the cold end module to simulate the air heat dissipation method and speed up the heat dissipation, and a pressure transmitter can be configured to measure the flow velocity in real time. The following embodiments include improvements to this embodiment, using water cooling to dissipate heat to achieve different test purposes.

In other specific embodiments, when multiple cold-end modules are fixed around the hot-end module, different heat dissipation methods can be used for the multiple cold-end modules, and water-cooled heat dissipation and natural heat dissipation can be combined to achieve a variety of unbalanced heat dissipation way to simulate the imbalance of thermoelectric power generation.

In this embodiment, both the heat source module 1 and the cold source module 2 are made of red copper, and red copper can generally be considered as pure copper, which has excellent thermal conductivity, ductility and corrosion resistance. In order to reduce heat dissipation, the entire test bench is wrapped with high temperature resistant heat insulating material. In order to reduce the heat conduction resistance, the thermoelectric sheet 4 is tightly clamped at both ends of the cold source and the heat source, and the surface of the thermoelectric sheet 4 is coated with a reliable and stable thermally conductive material with excellent thermal conductivity, such as thermally conductive silicone or thermally conductive silicone grease. In this embodiment, a layer of silver silicone grease is applied to both the upper and lower surfaces of the thermoelectric sheet 4 to achieve better heat transfer.

Embodiment 2: On the basis of the above embodiments, a thermoelectric power generation test bench is provided, in which the cold end modules are fixed on three sides of the hot end modules, and the fixed support modules 15 and the first clamping module 16 and the second clamping module are used respectively. The second clamping module 17, the first clamping module 16, is shown in FIG. 2 . The first clamping module 16 and the second clamping module 17 in Fig. 2 are two metal clamping plates, and are respectively provided with several through holes for fixing bolts on the fixed support module 15 and the two metal clamping plates , using bolts and nuts to fix the clamping plate on the support module 15 .

In other embodiments, it is also possible, but not limited to, to set the fixing module as a long bolt, and respectively set the first clamping module 16 and the second clamping module 17 as threaded fasteners or nuts.

Embodiment 3: This embodiment provides an embodiment in which water cooling is adopted for one side of the cold source module 2, and the other cold source modules 2 adopt a natural heat dissipation method; When using the source module 2, multiple cold source modules 2 need to be set for water cooling and heat dissipation, and the implementation method can refer to this embodiment.

On the basis of the above embodiments, the test bench provided in this embodiment also includes at least two side partitions 18, and the area size of the side partitions 18 is larger than the rectangular cross-sectional area of the tubular cold source module 2 and can be clamped and fixed on the tubular cold source. The two rectangular end faces of the module 2 are used to prevent cold water from flowing out from the side of the cooling source module 2 in the water cooling mode.

Both ends of one side of the cold source module 2 along the length direction of the pipe body are provided with threaded through holes, and the threaded through holes are respectively used for sealing and fixed connection with the cold water pipe 10 and the outlet pipe. Fig. 3 is a schematic diagram of the structure of the cold source module of the specific embodiment of the present invention in a water-cooled manner; in Fig. 3, the first threaded through hole 12 is connected and fixed with a cold water pipe 10, and the cold water pipe 10 leads cold water from the water storage tank 11 into the tubular cold end module In the hollow part, in other embodiments, the cold water source can also be directly connected to tap water. The second threaded through hole 13 is used to connect the water outlet pipe to discharge the cold water. In order to save water resources, the cold water discharged through the second threaded through hole 13 can be recycled. When the side partitions 18 are clamped and fixed on the two ends of the tubular cold source, the fixation is realized by the prior art, which will not be repeated here, and the purpose is to prevent the cold water from overflowing from the two ends of the pipe.

In other embodiments, when heating the heat source module 1 provided by the present invention, if heated hot water is used, it can also be implemented by referring to the cold source connection method in this embodiment, and the cold source module 2 is reasonably selected. number and location of settings.

The thermoelectric power generation test bench provided by the utility model can simulate different working conditions through the following settings:

1. When simulating automobile exhaust temperature difference power generation: the heat source module 1 in the middle is fed with hot air or water or water vapor after electric heating of the distribution box with artificially set temperature. The cold source dissipates heat by means of induced draft fan 5 fan convection, and the flow rate can be adjusted artificially through the operating frequency of the distribution box. But usually only one side of the four sides is enough for the cold source to simulate the built-in temperature difference power generation effect of the car;

2. When simulating aviation temperature difference power generation: the tubular central part of the heat source module 1 in the middle has a set high-temperature gas, and the cold source has water cooling to dissipate heat by convection, and water can be passed on all sides;

3. Simulated human body sensor thermoelectric generator: the heat source is the gas at the surface temperature of the human body, and the cold source is the natural external temperature. Simulate a single heat source on one side and a cold source on one side. The tiny voltage sent out can fully guarantee the charging function of normal electronic devices through the voltage stabilization and boosting functions of the DC-DC converter.

The utility model can simulate the test working conditions with a large temperature difference, and compare each working condition, that is, under the same hot air flow rate and temperature, which refrigeration method is better to achieve a large temperature difference, by making large The temperature difference method can realize high-efficiency thermoelectric power generation.

Implementation 4: On the basis of the above embodiments, in order to measure the temperature of the hot and cold ends of the thermoelectric sheet 4, a groove 8 is provided on the inner surface of the position where the thermoelectric sheet 4 is arranged in the middle of the heat source module 1 and the cold source module 2, for accommodating The T-type thermocouple 3 (composed of tightly wound constantan and copper wires) is embedded in the groove 8, and fits tightly without leaving external air contact, as shown in Fig. 4 and Fig. 5 . In this embodiment, a 0.2mm T-type thermocouple 3 (composed of constantan and copper wire) is embedded in the groove 8, and the thermocouple 3 is used to measure the temperature of the hot and cold ends of the thermoelectric sheet 4.

In order to improve the accuracy of the test measurement in this embodiment, an ice-water mixture is used to ensure that the cold junction temperature of the thermocouple 3 is zero degrees Celsius. As shown in FIG. 4 , a cold water container 7 is provided for storing the 0° ice-water mixture.

The thermoelectric potential generated by the thermocouple 3 is determined by the temperature difference between the hot and cold ends of the thermocouple 3. In actual measurement, it is difficult to keep the cold end at zero degrees Celsius. Therefore, in other embodiments, the thermocouple 3 compensation wire can also be used to reduce the gap between the cold junction and zero degrees Celsius. The role of the thermocouple 3 compensation wire is only to extend the hot electrode, so that the cold end of the thermocouple 3 moves to the instrument terminal in the control room. It cannot eliminate the influence of the temperature change of the cold end on the temperature measurement, and does not have a compensation effect. Therefore, other correction methods need to be used to compensate the influence on the temperature measurement when the cold junction temperature t0≠0℃. When using the thermocouple 3 compensation wire, it is necessary to pay attention to the model matching, the polarity cannot be wrongly connected, and the temperature of the connection end of the compensation wire and the thermocouple 3 cannot exceed 100°C.

In other embodiments, if the thermoelectric sheet 4 is used more, many thermocouple wires 19 are drawn out, then several thermocouple wires 19 can be connected to the digital-to-analog converter interface such as the ADAM4017 port through the rectangular plug connector 23 . Also in the case of a single thermoelectric chip or other connection methods to form a thermoelectric unit, the positive and negative poles at both ends are led out by wires, through the rectangular plug connector 23, and then connected to the ADAM4017 port, and then the open circuit or closed circuit voltage is displayed through the host computer.

ADAM-4017/4017+ is a 16-bit A/D 8-channel analog input module 22, which can collect analog input signals such as voltage and current. It provides programmable input ranges for all channels, these modules provide good cost performance for industrial measurement and monitoring applications; and it also provides 3000V voltage isolation between analog input channels and modules, so that Effectively prevent the module from being damaged when subjected to high-voltage impact. ADAM-4017 supports 6-way differential, 2-way single-ended signal, input range +/-150mV, +/-500mV, +/-1V, +/-5V, +/-10V, +/-20mA. If the current signal is tested, a 125 ohm precision resistor needs to be connected in parallel to the input port of the channel.

ADAM-4017+ supports 8 differential signals and also supports Modbus protocol. The input range of each channel can be set independently. At the same time, a dial switch is used on the right side of the module to set the switch between INT* and normal working status. The 4017+ also increases the input range of 4 ~ 20mA. When measuring current, no external connection is required. Resistor, just open the box cover and set the jumper to △. During specific implementation, if the connection form of the thermoelectric sheet 4 or the structural shape of the cold source module 2 or the heat source module 1 are changed, in order to avoid structural changes of the overall device, the lead-out end of the thermoelectric sheet 4 and the digital-to-analog converter can be connected. One end of the connector is connected to a rectangular plug connector 23, and the structural diagram is shown in FIG. 6 . Only need to separate the rectangular plug connector 23, resulting in the separation of the acquisition system and the thermoelectric power generation system, and the test transformation can be carried out separately without affecting each other. After the transformation is completed, the rectangular plug connector 23 can be connected here to recompose the entire test system .

Embodiment 5: On the basis of the above embodiments, in this embodiment, the effects of different MPPT (Maximum Power Point Tracking) control methods on thermoelectric power generation are simulated. When doing the maximum power test, first determine one of the cold and hot end conditions, and verify the Seebeck effect for each unit when the system is stable; use the formula of open circuit voltage and load current to calculate the internal resistance of the thermoelectric sheet 4 The size of the internal resistance; and then use the least squares method to fit and construct the power supply model. Program the MPPT algorithm into the MPPT controller. Several classic MPPT algorithms can be completed, such as: disturbance observation; conductance increment: open circuit voltage, etc. for comparison, and even innovate on this basis to achieve efficient maximum power tracking.

The present embodiment includes 32 thermoelectric sheets 4, and each thermoelectric sheet 4 needs to utilize the thermocouple 3 to measure the temperature of the hot and cold ends, and all have thermocouple wires 19 tightly wound with constantan and copper wires, so in the embodiment , connect several thermocouple wires 19 drawn out to the digital-to-analog converter interface.

This embodiment also includes a data acquisition system. The structure diagram of this embodiment is shown in Figure 7, consisting of a voltage sensor (not shown in the figure), a current sensor (not shown in the figure) and a pressure transmitter (not shown in the figure) , an analog input module 22 and an ADAM4017 or ADAM4018 produced by Advantech for connecting several thermocouple wires 19 and a host computer 20. The load control module 21 controls the access of the load to perform open-circuit and closed-circuit tests. In this embodiment, the load controller is a sliding rheostat. The control of open circuit and closed circuit is realized by ADAM4060. This module is very suitable for the application of switch control or low voltage switch control. The voltage sensor, current sensor and pressure transmitter are existing products, the voltage sensor is used to measure the closed circuit voltage and the open circuit voltage, the current sensor measures the current, and the real-time internal resistance of the thermoelectric chip can be calculated, and the pressure transmitter is used for the collection of flow velocity The data collected in this embodiment specifically include: the closed-circuit current and voltage of the thermoelectric sheet 4, and the voltage when the open circuit is opened, the temperature difference between the two ends of each thermoelectric sheet 4 when it is opened and closed, the outlet temperature of the distribution box, the water temperature, and the temperature of the gas or liquid. Physical quantities such as flow velocity and the analog output measured by multiple sensors are connected to the analog input module 22, and are transmitted to the host computer 20 through the RS485 protocol transmission line for display and storage. The simulation application MCGS configuration software can set the data acquisition cycle. Such as collecting once every 5s.

Embodiment 6:

Since the self-produced electric energy of the thermoelectric generation sheets is very small, it is mostly connected in series or in combination for practical applications. Since the heating area or the heat dissipation surface of the cold end must be uneven under different working conditions, the power generation of each thermoelectric sheet 4 The maximum power is different, so distributed considerations are required.

Due to the influence of factors such as the differences in the characteristics of the modules themselves and the uneven distribution of thermal energy in the space, the centralized thermoelectric power generation system cannot guarantee the maximum power generation of each module. In addition, it is impossible for the actual application situation that the surface of the thermoelectric sheet 4 absorbs heat evenly. In order to be close to the actual modeling, it is necessary to simulate the unbalanced heating of the hot air.

In a specific embodiment, cold source modules 2 are respectively arranged around the hot end module, and 8 pieces of thermoelectric chips 4 are sandwiched between each surface of the hot end module and a single cold source module 2, and the four sides can be used as one The units are connected in series with each other, and the surrounding thermoelectric sheets 4 can also be divided into 4 groups, a single sheet forms a group, a group of 8 sheets, two sheets on one side are connected in series, and other thermoelectric units are connected. Generally speaking, the temperature difference at the outlet end is the highest. With the heat dissipation and the energy consumption of the mutual thermoelectric conversion of the thermoelectric sheet 4, the temperature difference between the front and rear of the thermoelectric unit will gradually decrease. This is the so-called unbalanced heat transfer, so the electrical characteristics of each thermoelectric unit are different. Same, treat them differently. In order to achieve the maximum power tracking of each distributed power source, an energy management system is usually equipped so that each thermoelectric unit can maintain the maximum power point in real time.

As shown in Figure 8, the thermoelectric unit modules are connected in series to the centralized unit, and each thermoelectric unit is connected to its own distribution unit. The output terminals of each distribution unit are connected in parallel with the output terminals of the centralized unit. The maximum power output of each thermoelectric unit is determined by The centralized energy management system and the distributed energy management system can be realized together, and the difference and efficiency of the two methods can also be verified by relying on the functions of the centralized and distributed systems respectively.

Embodiment 7: On the basis of Embodiment 6, during specific implementation, because the self-generating power of thermoelectric sheet 4 is not high, so under the premise of improving thermoelectric conversion efficiency, add DC-DC step-up conversion in the present embodiment Using its boost conversion principle to further increase the voltage can increase the load capacity of the thermoelectric sheet 4 and improve the practical application capability of the thermoelectric sheet 4. The structural block diagram of the MPPT controller and DC-DC boost converter can be seen in Figure 9.

For the selection of the BOOST booster circuit, an inductance suitable for low-power high-frequency electromagnetic conversion, a reasonable charge and discharge capacitor, suitable for low rated voltage, relatively large current, high-frequency signal, low threshold voltage, and in-line MOS Tube. Therefore, electronic devices suitable for DC-DC boost converters for thermoelectric power generation are selected. Cdc=47uF, 25V; L=10mH; Co=330uF, 25V; MOS=2SK1960, 16V, 3A, N channel; D=germanium tube 0.33V.

The distributed or centralized thermoelectric sheet 4 is used as the power supply terminal, connected with a DC-DC step-up converter, and the switch tube controlling the step-up converter is connected with an MPPT controller, and the PWM wave sent by it can control its input voltage to reach the maximum power point.

The above are only preferred embodiments of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and deformations can also be made without departing from the technical principle of the present utility model. These improvements and deformations It should also be regarded as the protection scope of the present utility model.

Claims (10)

1. a kind of thermoelectric power generation testing stand, characterized in that including cold source module, heat source module, air-introduced machine, heater box；It is described cold Source module and heat source module are hollow tubular modules；The section of the heat source module is square, the section of the cold source module For rectangle, the rectangular long side in cold source module section is equal with the side length of heat source module cross-sectional square shape；

The testing stand further includes fixed supporting module and the first self-clamping module and the second self-clamping module, the first clamping mould Block and the second self-clamping module are set to the both ends of fixed supporting module and equal adjustable position and fixation, for by cold source module with Heat source module alignment grips；The cold source module and heat source module pass through fixed supporting module, the first self-clamping module and the It, can at least one sandwiched thermoelectric slice between cold source module and heat source module when two self-clamping modules grip；

It is provided with hot-air channel between the heater box and heat source module, air-introduced machine is set in the other end of heater box.

2. thermoelectric power generation testing stand according to claim 1, characterized in that further include at least two side partitions, the side Partition area size is greater than the rectangular cross-sectional area of tubulose cold source module and can be clamped to two of tubulose cold source module Rectangle end face, for stopping cold water to go out from cold source module side surface current in water cooling method.

3. thermoelectric power generation testing stand according to claim 2, characterized in that in the cold source module along pipe shaft length side To the both ends of single side offer tapped through hole, the tapped through hole is respectively used to and the cold source pipe and water outlet seal of tube is fixed connects It connects.

4. thermoelectric power generation testing stand according to claim 1, characterized in that sandwiched among heat source module and cold source module The position opposite inner face setting of thermoelectric slice is fluted, the hot and cold side for being embedded into measurement thermoelectric slice in groove for accommodating thermocouple Temperature.

5. thermoelectric power generation testing stand according to claim 1, characterized in that several thermocouple wires are accessed digital analog converter Interface.

6. thermoelectric power generation testing stand according to claim 1, characterized in that the testing stand further includes data acquisition system System, the data collection system include voltage sensor, current sensor, pressure transmitter, Analog input mModule and are used for Connect the digital analog converter and host computer of several thermocouple wires, the voltage sensor, pressure transmitter and current sensor The analog quantity measured accesses Analog input mModule and is transmitted to host computer.

7. thermoelectric power generation testing stand according to claim 6, characterized in that the testing stand further includes load control mould Block carries out the test of open circuit and closed circuit by the access of load control module control load.

8. thermoelectric power generation testing stand according to claim 1, characterized in that several thermoelectric slices are passed through different series connection groups Conjunction mode forms multiple thermoelectric units, and is equipped with Energy Management System for each thermoelectric unit and realizes that each thermoelectric unit is real-time Keep maximum power.

9. thermoelectric power generation testing stand according to claim 8, characterized in that it further include DC-DC boost converter, it is described MPPT controller is connected at the switching tube of DC-DC boost converter, the PWM wave issued controls input voltage, reaches maximum work Rate point.

10. thermoelectric power generation testing stand described in any one claim according to claim 1~9, characterized in that the cold source Module and heat source module use red copper material.