CN208443888U - One kind being based on STM32 DC Electronic Loads - Google Patents
One kind being based on STM32 DC Electronic Loads Download PDFInfo
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- CN208443888U CN208443888U CN201821182568.XU CN201821182568U CN208443888U CN 208443888 U CN208443888 U CN 208443888U CN 201821182568 U CN201821182568 U CN 201821182568U CN 208443888 U CN208443888 U CN 208443888U
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- circuit
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- amplifying circuit
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Abstract
The utility model discloses one kind to be based on STM32 DC Electronic Loads, and the electronic load includes system power supply, MCU controller, analog to digital conversion circuit, D/A converting circuit, current sample amplifying circuit, voltage sample amplifying circuit, power modules, heat radiation module and LCD touch screen；The MCU controller respectively with analog to digital conversion circuit, D/A converting circuit two-way communication link, the input terminal of the output end connection power modules of D/A converting circuit, the output end of power modules is separately connected the input terminal of current sample amplifying circuit and voltage sample amplifying circuit, the output end of current sample amplifying circuit and voltage sample amplifying circuit is separately connected the input terminal of analog to digital conversion circuit, the MCU controller is bi-directionally connected with LCD touch screen, the utility model, the various different loads situations of analog.
Description
Technical field
The utility model relates to a kind of DC Electronic Loads, and in particular to one kind is based on STM32 DC Electronic Loads.
Background technique
" load " function that electronic load is realized using power semiconductor component, basic principle are based on Ohm's law.
Exactly, electronic load is the conduction amount by control internal power semiconductor device MOSFET or transistor, makes power tube
Dissipated power, the equipment for consuming electric energy.It needs to be widely used in the occasion for carrying out discharge test various.Electronic load is a kind of
External setting-up can be passed through and control the instrument of electric current, voltage, resistance or power.A variety of different load shapes can be simulated
Condition.
Utility model content
The purpose of this utility model provides a kind of based on STM32 DC Electronic Loads, the various different loads situations of analog.
The utility model is achieved through the following technical solutions:
One kind being based on STM32 DC Electronic Loads, and the electronic load includes system power supply, MCU controller, analog-to-digital conversion
Circuit, D/A converting circuit, current sample amplifying circuit, voltage sample amplifying circuit, power modules, heat radiation module and LCD touching
Touch screen；The output end of the system power supply is separately connected MCU controller, analog to digital conversion circuit, D/A converting circuit, current sample
The input terminal of amplifying circuit and voltage sample amplifying circuit provides power supply, and MCU controller turns with analog to digital conversion circuit, digital-to-analogue respectively
Change circuit two-way communication link, the input terminal of the output end connection power modules of D/A converting circuit, the output end of power modules
It is separately connected the input terminal of current sample amplifying circuit and voltage sample amplifying circuit, current sample amplifying circuit and voltage sample
The output end of amplifying circuit is separately connected the input terminal of analog to digital conversion circuit, the MCU controller and the two-way company of LCD touch screen
It connects.
As the preferred embodiment of the utility model, MCU controller described in the utility model passes through with analog to digital conversion circuit
The connection of FSMC parallel bus, the MCU controller are connect with D/A converting circuit by SPI serial communication bus.
As the preferred embodiment of the utility model, electronic load described in the utility model also sets up heat radiation module, described
Heat radiation module is made of cooling fin and radiator fan, and the electronic load is arranged multiple power modules, each power modules for
One heat radiation module.
As the preferred embodiment of the utility model, electronic load described in the utility model also sets up a protection circuit, institute
State the electric routing relay composition of protection.
As the preferred embodiment of the utility model, the model of MCU controller described in the utility model
STM32F407VET6。
As the preferred embodiment of the utility model, current sample amplifying circuit and voltage sample described in the utility model are put
Big circuit respectively includes two sense channels, and each sense channel is made of sampling resistor and instrument amplifier, the sampling electricity
Resistance resistance value is 50 milliohms, the model AD8422 of the instrument amplifier.
As the preferred embodiment of the utility model, analog to digital conversion circuit described in the utility model is by chip AD7606 group
It include that input amplifier, overvoltage crowbar, second order simulation frequency overlapped-resistable filter, Multipexer are multiple at, the chip AD7606
With device, 16 ADC and digital filters.
As the preferred embodiment of the utility model, D/A converting circuit described in the utility model is by chip AD5060 group
At.
As the preferred embodiment of the utility model, power modules described in the utility model are the operation amplifier of model OP07
Device.
Using the DC Electronic Loads provided by the utility model based on STM32, external setting-up can be passed through and control electricity
Stream, voltage, resistance or power can simulate a variety of different load states.
Detailed description of the invention
Fig. 1 is the circuit structure schematic block diagram of the utility model；
Fig. 2 is the 12V power supply circuit construction schematic diagram of the system power supply of the utility model；
Fig. 3 is the 5V power supply circuit construction schematic diagram of the system power supply of the utility model；
Fig. 4 is the 3.3V power supply circuit construction schematic diagram of the system power supply of the utility model；
Fig. 5 is the MCU controller circuit structure schematic diagram of the utility model；
Fig. 6 is the current sample amplifying circuit and voltage sample amplification circuit structure schematic diagram of the utility model；
Fig. 7 is the analog to digital conversion circuit structural schematic diagram of the utility model；
Fig. 8 is the power modules electrical block diagram of the utility model；
Fig. 9 is the D/A converting circuit structural schematic diagram of the utility model.
Specific embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with the drawings and specific embodiments to the utility model make into
One step detailed description.
As shown in Fig. 1, a kind of to be based on STM32 DC Electronic Loads, the electronic load includes system power supply, MCU control
Device (micro-control unit, Microcontroller Unit) processed, analog to digital conversion circuit, D/A converting circuit, current sample amplification
Circuit, voltage sample amplifying circuit, power modules, heat radiation module and LCD touch screen；The output end of the system power supply connects respectively
Connect the defeated of MCU controller, analog to digital conversion circuit, D/A converting circuit, current sample amplifying circuit and voltage sample amplifying circuit
Enter end provide power supply, MCU controller respectively with analog to digital conversion circuit, D/A converting circuit two-way communication link, digital-to-analogue conversion electricity
The input terminal of the output end connection power modules on road, the output end of power modules are separately connected current sample amplifying circuit and voltage
The output end of the input terminal of amplifier circuit, current sample amplifying circuit and voltage sample amplifying circuit is separately connected modulus and turns
The input terminal of circuit is changed, the MCU controller is bi-directionally connected with LCD touch screen.DC Electronic Loads and power electric connection to be measured,
For testing electric current, voltage, power and the resistance of power supply to be measured.
Electronic load described in the utility model also sets up heat radiation module, and the heat radiation module is by cooling fin and radiator fan group
At multiple power modules are arranged in the electronic load, and each power modules are for a heat radiation module.The electronic load is also set up
One protection circuit, the electric routing relay composition of the protection.
Each functional module in the present embodiment is described in further detail below:
The system power supply circuit offer ± 12V power supply of the utility model is for circuits such as amplifiers；+ 5V is used for ADC
(abbreviation of Analog-to-Digital Converter, analog-digital converter) analog to digital conversion circuit, DAC (Digital to
The abbreviation of analog converter, digital analog converter) D/A converting circuit chip circuit；3.3V is mainly used for MCU control
Device circuit processed.
By FSMC, (Flexible Static Memory Controller can be changed static storage control to MCU controller
Device) parallel bus communicates with analog to digital conversion circuit (ADC chip), and ADC chip is responsible for acquiring the 6 road electric currents exported by power modules
Signal and 2 road voltage signals obtain voltage, electric current, resistance and power physical quantity, by digital PID by internal conversion
Algorithm operation obtains the digital quantity of output control.
MCU controller is connected by SPI serial communication bus with DAC, and DAC D/A converting circuit will pass through MCU digital PID
Digital controlled signal after operation is converted into voltage analog, and the conduction amount of power modules is controlled with this.
The utility model heat radiation module is made of cooling fin and radiator fan, and every suit power modules are correspondingly arranged one group
Heat radiation module.Radiator fan is powered by one group of independent 12V, is realized revolving speed control by MCU output pwm signal, is cooperated cooling fin
Temperature detection realize different capacity under different rotating speeds strategy.
LCD touch screen interface described in the utility model is determined that selected LCD touch screen interface is that UART is serial by type selecting
Interface has the characteristics that interface is succinct, communication is convenient.
Protection circuit described in the utility model is mainly completed by relay, when MCU detects overcurrent, over-voltage or reversal connection
The case where when, disconnect relay, realize that connection between power supply and electronic load to be measured disconnects, electronic load is protected not damaged
It is bad.
The 12V power supply circuit construction schematic diagram of the system power supply of the utility model is as shown in Fig. 2, positive and negative 12V power supply circuit
Positive and negative 12V sinusoidal voltage is exported by Industrial Frequency Transformer, the arteries and veins that peak value is respectively ± 16.968V is exported after full-bridge rectifier filter
Dynamic DC voltage.Finally stable ± 12V DC voltage is exported by linear regulator chip LM7812 and LM7912.
The 5V power supply circuit construction schematic diagram of the system power supply of the utility model as shown in figure 3,5V power supply circuit by two-way
Composition, 12V output of the input voltage after full-bridge rectification, a routing adjustable line voltage-stablizer LM2941 match by feedback resistance
Than the voltage that output is slightly above 5V, it to be used for ADC, analog circuit DAC etc. more demanding to voltage ripple；Other routing DC-
DC converts BUCK chip LM2596 and provides the output voltage of about 5V, this circuit digital circuit of less demanding for ripple.
The 3.3V power supply circuit construction schematic diagram of the system power supply of the utility model as shown in figure 4,3.3V by linear voltage stabilization
Device AMS1117-3.3 is provided, and is mainly used for MCU power supply.
The MCU controller circuit structure schematic diagram of the utility model as shown in figure 5, the MCU controller model
STM32F407VET6.The utility model selectes the STM32F407VET6 that MCU chip is ST Microelectronics (ST) production,
Using 90 nanometers of NVM technique and ART technology, ART technology can be such that program zero-waiting executes, and reduce program runtime,
It improves efficiency, gives full play to the performance of Cortext-M4.The design of STM32F4 Series of MCU external circuit is relatively simple,
Minimum system also needs reset circuit other than each energization pins need to connect 104 decoupling capacitors, and reset low level is effective, this
Utility model is connected between NRST pin (Pin14) and power ground using capacitor and key, realize default electrification reset with
Hand-reset.External 8Mhz crystal oscillating circuit provides system clock, its dominant frequency can after a series of frequencys multiplication of frequency multiplier circuit inside MCU
Up to 168Mhz.
The current sample amplifying circuit and voltage sample amplification circuit structure schematic diagram of the utility model are as shown in fig. 6, Fig. 6
Shown in circuit realize voltage sample, current sample, including current detection circuit and voltage detecting circuit are described in the utility model
Current sample amplifying circuit in, current detection circuit shares three groups, and each group includes two current detecting channels.Each channel
It is made of a 50 milliohm sampling resistors and an instrument amplifier, 0-10A current signal is converted into 0- by 50 milliohm resistance
The voltage signal of 500mV, then the signal that 10 times form 0-5V is amplified by instrument amplifier AD8422 and is exported.Supply ADC chip 6
The sampling in channel inputs.About sampling resistor type selecting, according to Ohm's law, since input current maximum is in 10A, 50 milliohms are adopted
The power to dissipate on sample resistance is 00.5*10*10=5W.In order to guarantee sampling precision in certain temperature range, using power
For the BWL precision sampling resistor of 5W, nominal accuracy 0.1%.Its power deratng 50% is used, then each channels operation can be obtained
Electric current the largest of about 7A, theoretically 6 channels are total up to 42A.
The voltage detecting circuit is obtained by electric resistance partial pressure, is switched input voltage division signal by signal relay and is realized two
The switching of voltage gear, intrinsic standoff ratio are respectively 30 and 3.Rear class instrument amplifier AD8422 amplification factor goes as 1, it can be achieved that voltage
Two-way detection.Voltage is positive, and instrument amplifier exports positive voltage；Voltage reversal, instrument amplifier export negative voltage.Cooperation 8
The bipolarity input ADC chip AD7606 of Channel Synchronous sampling is, it can be achieved that electric voltage reverse-connection protection, over-voltage over-current protection, overpower
Defencive function.
The analog to digital conversion circuit structural schematic diagram of the utility model as shown in fig. 7, analog-digital conversion circuit as described by chip
AD7606 composition, AD7606 described in the utility model is a 8 Channel Synchronous data collection system of integrated form, be can be realized more
A channel samples, keeps, converting simultaneously, and collection while realizing multiple channel datas becomes synchronous sampling technique.AD7606 piece
Inside be integrated with input amplifier, overvoltage crowbar, second order simulation frequency overlapped-resistable filter, analog multiplexer, 16 ADC and
One digital filter.
The power modules electrical block diagram of the utility model is as shown in Fig. 1,8, and the power modules are divided into three groups, packet
Power modules 1, power modules 2, power modules 3 are included, are connect respectively with the output end of D/A converting circuit.The power modules are defeated
6 road current signals and 2 road voltage signals out.
For the D/A converting circuit structural schematic diagram of the utility model as shown in Fig. 1,9, the D/A converting circuit is 16
DAC circuit, including three groups, each group is connect by controlling signal with power modules.
It as shown in Figure 8,9, is the control circuit of one group of power modules, three groups of control circuits are arranged in the utility model altogether, often
One group mutually indepedent.ACH3, ACH4 signal are current sampling signal, and DCH3 is DAC output voltage signal.Current sampling signal warp
Precision amplifier AD4522-2 is crossed to follow consequently as the reverse side input signal for controlling amplifier OP07.DAC output voltage signal conduct
Control the in-phase end input signal of amplifier OP07.OP07 external circuit constitutes inner ring of the pi regulator as entire control loop.
Realize the variable control of metal-oxide-semiconductor grid voltage.It, must be in amplifier output end and metal-oxide-semiconductor grid since there are endophyte resistance for metal-oxide-semiconductor
Pole concatenates current-limiting resistance, prevents amplifier from generating concussion because of capacitive load.Furthermore resistance offer is discharged back between metal-oxide-semiconductor GS grades
Road, shunt capacitance main composition RC low-pass filter, the due to voltage spikes for inhibiting external disturbance to generate can be according to practical need
It determines to connect and not connect.
DC Electronic Loads provided by the embodiment of the utility model can pass through external setting-up and control electric current, voltage, electricity
Resistance or power, can simulate a variety of different load states.
Above-described embodiment is the preferable implementation of the utility model, is not the restriction to the utility model, not
Be detached from the utility model inventive concept under the premise of, it is any it is obvious replacement the protection scope of the utility model it
It is interior.
Claims (9)
1. one kind is based on STM32 DC Electronic Loads, it is characterised in that: the electronic load includes system power supply, MCU control
Device, analog to digital conversion circuit, D/A converting circuit, current sample amplifying circuit, voltage sample amplifying circuit, power modules, heat dissipation
Mould group and LCD touch screen；The output end of the system power supply is separately connected MCU controller, analog to digital conversion circuit, digital-to-analogue conversion electricity
The input terminal on road, current sample amplifying circuit and voltage sample amplifying circuit provides power supply, MCU controller respectively with analog-to-digital conversion
Circuit, D/A converting circuit two-way communication link, the input terminal of the output end connection power modules of D/A converting circuit, power mould
The output end of group is separately connected the input terminal of current sample amplifying circuit and voltage sample amplifying circuit, current sample amplifying circuit
And the output end of voltage sample amplifying circuit is separately connected the input terminal of analog to digital conversion circuit, the MCU controller and LCD are touched
Screen is bi-directionally connected.
2. according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: the MCU controller and modulus
Conversion circuit is connected by FSMC parallel bus, and the MCU controller is connected with D/A converting circuit by SPI serial communication bus
It connects.
3. according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: the electronic load is also set up
Heat radiation module, the heat radiation module are made of cooling fin and radiator fan, and multiple power modules are arranged in the electronic load, each
Power modules are for a heat radiation module.
4. according to claim 1 or 3 be based on STM32 DC Electronic Loads, it is characterised in that: the electronic load is also set
Set a protection circuit, the electric routing relay composition of the protection.
5. according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: the model of the MCU controller
For STM32F407VET6.
6. according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: the current sample amplification electricity
Road and voltage sample amplifying circuit respectively include two sense channels, and each sense channel is by sampling resistor and instrument amplifier group
At the sampling resistor resistance value is 50 milliohms, the model AD8422 of the instrument amplifier.
7. it is according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: analog-digital conversion circuit as described by
Chip AD7606 composition, the chip AD7606 include input amplifier, overvoltage crowbar, second order simulation anti-aliasing filter
Device, analog multiplexer, 16 ADC and digital filters.
8. it is according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: the D/A converting circuit by
Chip AD5060 composition.
9. according to claim 1 be based on STM32 DC Electronic Loads, it is characterised in that: the power modules are model
The operational amplifier of OP07.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821182568.XU CN208443888U (en) | 2018-07-23 | 2018-07-23 | One kind being based on STM32 DC Electronic Loads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821182568.XU CN208443888U (en) | 2018-07-23 | 2018-07-23 | One kind being based on STM32 DC Electronic Loads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208443888U true CN208443888U (en) | 2019-01-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821182568.XU Expired - Fee Related CN208443888U (en) | 2018-07-23 | 2018-07-23 | One kind being based on STM32 DC Electronic Loads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208443888U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501540A (en) * | 2019-08-23 | 2019-11-26 | 深圳市精泰达科技有限公司 | A kind of electronic load circuit |
-
2018
- 2018-07-23 CN CN201821182568.XU patent/CN208443888U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501540A (en) * | 2019-08-23 | 2019-11-26 | 深圳市精泰达科技有限公司 | A kind of electronic load circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190129 Termination date: 20200723 |
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| CF01 | Termination of patent right due to non-payment of annual fee |