CN105182251A - DC load automatic loading device - Google Patents
DC load automatic loading device Download PDFInfo
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- CN105182251A CN105182251A CN201510641374.6A CN201510641374A CN105182251A CN 105182251 A CN105182251 A CN 105182251A CN 201510641374 A CN201510641374 A CN 201510641374A CN 105182251 A CN105182251 A CN 105182251A
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Abstract
The invention discloses a DC load automatic loading device relating to the technical field of electrical equipment. In the device, according to needed resistance, a controller determines a to-be-conducted load circuit in a load array and sends a driving instruction, which is used for conduct the to-be-conducted load circuit, to the load array. After receiving the driving instruction, the load array conducts the to-be-conducted load circuit to load a DC load of the needed resistance. The device reduces the loss and cost of electric energy, can simulate complex loading situations, is improved in testing precision, and has a small size and a long service life.
Description
Technical field
The present invention relates to electrical equipment technical field, particularly a kind of automatic loading device of DC load.
Background technology
Along with the development of economic society, power supply is widely used in the various aspects that people produce, live, and the quality of power quality will directly affect production and the living safety of people.Therefore, need to test power supply.Traditionally, usually adopt the static resistances such as fixed resistance, slide rheostat and resistance box as load, this method also exists that energy consumption is high, volume is large, can not simulate the shortcomings such as the characteristic of actual loading neatly.Particularly the promoteing the wider application of electric automobile, propose a lot of requirements to the test of direct supply, direct supply all needs to test its characteristic such as the precision of voltage regulation, ripple factor, precision of steady current, pressure limiting characteristic, cut-off current characteristics, voltage, current calibration precision, charge efficiency exported usually.
Traditionally, usually adopting the static loads such as bulky resistance box, slide rheostat and waterr rheostat test platform to replace actual loading, there is the shortcoming of the following aspects in traditional static load:
Owing to adopting energy consumption type load to test, the loss of active power is excessive, and a large amount of electric energy is consumed in vain, and resistance consumption electric energy can produce heat, thus needs additional refrigeration plant, as air-conditioning, fan etc., adds cost.Have level to regulate, static load generally has fixing resistance or dynamic characteristic, and form is single, can not simulate the loading condition of actual complex.Measuring accuracy is lower, bulky, takies a large amount of spaces, and easy aging and scaling loss.
Summary of the invention
In view of the above problems, the present invention is proposed to provide a kind of a kind of automatic loading device of DC load overcoming the problems referred to above or solve the problem at least in part.
According to one aspect of the present invention, provide a kind of automatic loading device of DC load, described device comprises: the controller connected successively and load array, and described load array comprises some load circuits for simulating different resistance;
Described controller, treats conducting load circuit for determining according to required resistance in described load array, and sends the driving instruction being used for treating conducting load circuit described in conducting to described load array;
Described load array, for after receiving described driving instruction, treats conducting load circuit described in conducting, to load the DC load of described required resistance.
Alternatively, the load circuit in described load array comprises metal-oxide-semiconductor field effect transistor, and when described metal-oxide-semiconductor field effect transistor is driven, the load circuit at described metal-oxide-semiconductor field effect transistor place is switched on.
Alternatively, described device also comprises: latch cicuit, and described latch cicuit is located between described controller and load array;
Described controller, also for sending described driving instruction to described latch cicuit;
Described latch cicuit, for carrying out buffer memory to described driving instruction, and is forwarded to described load array by the driving instruction of buffer memory.
Alternatively, described device also comprises: the host computer be connected with described controller;
Described host computer, for receive user input needed for resistance, and by reception needed for resistance be sent to described controller.
Alternatively, connected by photoelectric-isolated RS485 interface between described host computer and controller.
Alternatively, described device also comprises: the matrix keyboard be connected with described controller;
Described matrix keyboard, for receive user input needed for resistance, and by reception needed for resistance be sent to described controller.
Alternatively, described device also comprises: the alarm input circuit be connected with described controller;
Described alarm input circuit, for obtaining alerting signal, and is sent to described controller by the alerting signal of reception.
Alternatively, described device also comprises: the electric current and voltage Acquisition Circuit be connected with described controller;
Described electric current and voltage Acquisition Circuit, for obtaining the voltage and current of described DC load, and is sent to controller by the voltage and current of acquisition.
Alternatively, described device also comprises: the temperature collection circuit be connected with described controller;
Described temperature collection circuit, for obtaining the temperature of described DC load, and is sent to controller by the temperature of acquisition.
Alternatively, described device also comprises: the display be connected with described controller;
Described controller, also for the voltage received, electric current and temperature are forwarded to described display;
Described display, for showing the voltage received, electric current and temperature.
Middle controller of the present invention is determined to treat conducting load circuit in described load array according to required resistance, and the driving instruction being used for treating conducting load circuit described in conducting is sent to described load array, described load array is after receiving described driving instruction, treat conducting load circuit described in conducting, to load the DC load of described required resistance, reduce electric energy loss and cost, and the loading condition of energy Simulation of Complex, measuring accuracy is increased, and volume is little, and long service life.
Accompanying drawing explanation
Fig. 1 is the structural representation of the automatic loading device of the DC load of one embodiment of the present invention;
Fig. 2 is the structural representation of the latch cicuit in the device shown in Fig. 1;
Fig. 3 is the structural representation of the load circuit of load matrix in the device shown in Fig. 1;
Fig. 4 is host computer in the device shown in Fig. 1 and the Principle of Communication figure between controller;
Fig. 5 is the structural representation of the alarm input circuit in the device shown in Fig. 1;
Fig. 6 is the structural representation of the potential circuit Acquisition Circuit in the device shown in Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the structural representation of the automatic loading device of the DC load of one embodiment of the present invention; With reference to Fig. 1, described device comprises: the controller connected successively and load array, and described load array comprises some load circuits for simulating different resistance;
Described controller, treats conducting load circuit for determining according to required resistance in described load array, and sends the driving instruction being used for treating conducting load circuit described in conducting to described load array;
It should be noted that, described controller can select single chip microcontroller C805IF020, and it is 8051 compatible CIP-51 kernels of a fully-integrated mixed-signal system level chip, its high-speed flow line structure, and speed can reach 25MIPS.12, the 64KB on-chip memory of the 8 passage ADC of 100Ksps, 2 12 DAC, 4352 (4096+256) B can the flash storage of in-system programming, the external data memory interface of addressable 64KB address space.The interior on-line system debugging interface with high speed non-intrusion type of sheet is with GA and analog multichannel switch.Hardware attainable SPI, SMBus/I2C and 2 UART serial line interfaces.5 general 16 bit timing devices, have 5 programmable counter/Timer Array catching comparison module; With interior WatchDog Timer, VDD monitor and temperature sensor; C8051F020 is a SOC (system on a chip) really worked alone, and C8051F020 is applied to the automatic loading device of DC load, can reduce peripheral components in a large number, gives full play to the high-speed feature of C8051F020, substantially increases integrated level and the security of system.
Described load array, for after receiving described driving instruction, treats conducting load circuit described in conducting, to load the DC load of described required resistance.
In specific implementation, the load circuit in present embodiment adopts high precision heating alloy pipe to simulate resistance, and resistance stability is good, and temperature drift coefficient is little.According to different loads power and voltage request, carry out stepping, all standing of the different electric current of the different voltage of the ascending realization of gear.If gear is all standing that 00V/0.01A, 800V/0.02A, 800V/0.03A, 800V/0.04A, 800V/0.1A, 800V/0.2A, 800V/0.3A, 800V/0.4A can realize 800V0.01A-1.1A.
Present embodiment middle controller is determined to treat conducting load circuit in described load array according to required resistance, and the driving instruction being used for treating conducting load circuit described in conducting is sent to described load array, described load array is after receiving described driving instruction, treat conducting load circuit described in conducting, to load the DC load of described required resistance, reduce electric energy loss and cost, and the loading condition of energy Simulation of Complex, measuring accuracy is increased, and volume is little, and long service life.
Will be understood that, described in control, treat that the conducting of conducting load circuit can be adopted in two ways: D.C. contactor controls and metal-oxide-semiconductor field effect transistor controls.D.C. contactor is owing to being physical construction, and its feature control rate is slow, serviceable life is short, have and obviously isolate breakpoint, according to its characteristic, is applied at native system, total export break-make, warning, suddenly stop protection.Metal-oxide-semiconductor field effect transistor and Metal-oxide-semicondutor type field effect transistor, english abbreviation is MOSFET (i.e. Metal-OxideField-Effect-Transistor), belongs to insulated-gate type.Its principal feature is between metal gates and raceway groove, have layer of silicon dioxide insulation course, therefore has very high input resistance (reaching as high as 1015 Ω).According to the difference of electrically conducting manner, metal-oxide-semiconductor field effect transistor divides again enhancement mode, depletion type.So-called enhancement mode refers to: as UGS=0, pipe is that after adding correct UGS, majority carrier attracted to grid in cut-off state, thus " enhancings " charge carrier in this region, formation conducting channel.Depletion type then refers to: form raceway groove as UGS=0, when adding correct UGS, majority carrier can be made to flow out raceway groove, thus " exhausted " charge carrier, made pipe turn to cut-off.Metal-oxide-semiconductor field effect transistor is voltage controlled element, has the advantage that standby current is little, switching frequency is high, power consumption is extremely low.
Present embodiment is by metal-oxide-semiconductor field effect transistor control mode, and that is, the load circuit in described load array comprises metal-oxide-semiconductor field effect transistor, and when described metal-oxide-semiconductor field effect transistor is driven, the load circuit at described metal-oxide-semiconductor field effect transistor place is switched on.
For ease of controlling described metal-oxide-semiconductor field effect transistor, by arranging MOS control panel, each metal-oxide-semiconductor field effect transistor being driven in present embodiment, there is volume little, power is little, withstand voltage height, the advantages such as switching speed is fast, be suitable for the application loading DC load, realize curve saltus step fast.
For ensureing to described load circuit after switch, can keep the state of conducting, alternatively, described device also comprises: latch cicuit (not shown), and described latch cicuit is located between described controller and load array;
Described controller, also for sending described driving instruction to described latch cicuit;
Described latch cicuit, for carrying out buffer memory to described driving instruction, and is forwarded to described load array by the driving instruction of buffer memory.
In present embodiment, with reference to Fig. 2, described latch cicuit is by 74HC573 control load after isolation, and its implementation is: C8051F020 is through computing, and corresponding I/O port outputs signal, input to 74HC573, after 74HC573 buffer memory, after receiving described driving instruction, described in driving, treat the metal-oxide-semiconductor field effect transistor of conducting load circuit, to load the DC load of described required resistance, with reference to Fig. 3.
Determine required resistance for ease of user, alternatively, described device also comprises: the host computer be connected with described controller;
Described host computer, for receive user input needed for resistance, and by reception needed for resistance be sent to described controller.
Because C8051FO20 chip has dual serial communication interface UART and UART1.In order to improve the reliability of itself and upper machine communication, present embodiment, connected by photoelectric-isolated RS485 interface between described host computer and controller.RS485 signal disturbs famous with long distance, multi-user, anti-(common mode).RS485 signal can run into interference usually, if queued up according to the frequent degree of interference appearance roughly should be divided into four kinds: 1, strong common mode interference.2, coupling interference.3, hardware fault.4, line fault.These four kinds of situations are not often individualisms, but interpromoting relation in five elements together, mutually aggravates, system is constantly worsened.The problem of the first two is solved in strict accordance with following way: join RS485 transmission line in device interior RS485 transmission and outside institute and adopt 3 line systems, i.e. 485A, 485B, GND in system is produced.485A, 485B can with twisted-pair feeder or also double core shielding cables, with reference to Fig. 4.
Input required resistance for ease of user, alternatively, described device also comprises: the matrix keyboard be connected with described controller;
Described matrix keyboard, for receive user input needed for resistance, and by reception needed for resistance be sent to described controller.
Matrix keyboard in present embodiment adopts mechanical keying formations simple, and cost performance is high, easy to use.
For ease of obtaining warning message, described device also comprises: the alarm input circuit be connected with described controller;
Described alarm input circuit, for obtaining alerting signal, and is sent to described controller by the alerting signal of reception.
Described alerting signal can be the alerting signal that host computer collects, and through photoelectric coupler isolation input, determines whether to report to the police according to alerting signal, and photoelectrical coupler conducting input C8051F020 signal drags down, and prompting is reported to the police, and schematic diagram as shown in Figure 5.
For ease of obtaining the voltage and current of described DC load, alternatively, described device also comprises: the electric current and voltage Acquisition Circuit be connected with described controller;
Described electric current and voltage Acquisition Circuit, for obtaining the voltage and current of described DC load, and is sent to controller by the voltage and current of acquisition.
In specific implementation, electric current and voltage Acquisition Circuit adopts ADS1232 chip to realize, and ADS1232 is that the integrated delta-sigma analog to digital converter of a height is for high-acruracy survey.This device is made up of from steady modulator the instrument amplifier of a low drifting, low noise and a high-order amplitude limit be connected on single-chip integration digital filter.Alternative gain can be set to 1,2,64,128 ,+5V reference voltage time, allow full scale Differential signal input range from ± 2.5V to ± 19.5mV.This scheme further comprises oscillator and external crystal oscillator on a low drifting sheet simultaneously, to realize accurate output data rate, thus suppresses the frequency of 50Hz and 60Hz simultaneously.ADS1232 output data rate can be 105SPS or 80SPS, with reference to Fig. 6.
For ease of gathering temperature, alternatively, described device also comprises: the temperature collection circuit be connected with described controller;
Described temperature collection circuit, for obtaining the temperature of described DC load, and is sent to controller by the temperature of acquisition.
For ease of showing the data obtained, alternatively, described device also comprises: the display be connected with described controller;
Described controller, also for the voltage received, electric current and temperature are forwarded to described display;
Described display, for showing the voltage received, electric current and temperature.
In present embodiment, display adopts and special designs 5.6 inches, the very color TFT liquid crystal display of shielding for single-chip microcomputer, provides a simple 8-bit High-Speed bus to be connected with single-chip microcomputer, supports 256 looks.Can directly be connected with MCS51, MCS96, MC68, ARM and DSP.Directly input X, Y-coordinate, need not calculated address.Low-power consumption, thin design, wide temperature (-30 degree are to 85 degree), brightness adjustable (regulating 8 kinds of brightness), low-power consumption mode (turning off display).
The principle of work of present embodiment is: complete C38051F020 system initialization, initialization clock, initialization liquid crystal display, initializes memory, initialization ADC and input and output etc.Needed for host computer or input through keyboard, resistance is determined, conducting load circuit is treated in described load array, and the driving instruction being used for treating conducting load circuit described in conducting is sent to described load array, described load array is after receiving described driving instruction, conducting load circuit is treated described in conducting, to load the DC load of described required resistance, thus the constant current realizing load loads, constant-resistance loads and invariable power loads, gather the voltage of load array, electric current and temperature, and the voltage that will gather, electric current and temperature carry out A/D conversion, shown by display again.
Certainly, in present embodiment, also can radiator fan be set, thus prevents each part temperatures too high.
Compared with the prior art, the accessible beneficial effect of present embodiment is:
1. use C8051F020 Single-chip Controlling to realize the functions such as able to programme, the automatic loading of load, solve the able to programme automatic control problem of load charging set Auto-Test System from angles of loading.
2. can apply 3D graphics software technology and complete rational deployment to whole system and design for aesthetic, make the DC load that can automatically load in function, have greatly improved than load in the past in appearance.
3. in the characteristic such as the precision of voltage regulation, ripple factor, precision of steady current, pressure limiting characteristic, cut-off current characteristics, voltage, current calibration precision, charge efficiency of test electric automobile battery charger, can according to the self-adjusting characteristic of load, realize the automatic test of various classical insulation, simulate actual dynamic load, avoid the loaded down with trivial details and error of artificial adjustment.
4. be control based on the load of MOS, control than conventional load, as used Control, speed is fast, and precision is high; Than using pure Electronic Control, temperature drift is low, and precision is high.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. an automatic loading device for DC load, is characterized in that, described device comprises: the controller connected successively and load array, and described load array comprises some load circuits for simulating different resistance;
Described controller, treats conducting load circuit for determining according to required resistance in described load array, and sends the driving instruction being used for treating conducting load circuit described in conducting to described load array;
Described load array, for after receiving described driving instruction, treats conducting load circuit described in conducting, to load the DC load of described required resistance.
2. device as claimed in claim 1, it is characterized in that, the load circuit in described load array comprises metal-oxide-semiconductor field effect transistor, and when described metal-oxide-semiconductor field effect transistor is driven, the load circuit at described metal-oxide-semiconductor field effect transistor place is switched on.
3. device as claimed in claim 1, it is characterized in that, described device also comprises: latch cicuit, and described latch cicuit is located between described controller and load array;
Described controller, also for sending described driving instruction to described latch cicuit;
Described latch cicuit, for carrying out buffer memory to described driving instruction, and is forwarded to described load array by the driving instruction of buffer memory.
4. device as claimed in claim 1, it is characterized in that, described device also comprises: the host computer be connected with described controller;
Described host computer, for receive user input needed for resistance, and by reception needed for resistance be sent to described controller.
5. device as claimed in claim 4, is characterized in that, is connected between described host computer and controller by photoelectric-isolated RS485 interface.
6. device as claimed in claim 1, it is characterized in that, described device also comprises: the matrix keyboard be connected with described controller;
Described matrix keyboard, for receive user input needed for resistance, and by reception needed for resistance be sent to described controller.
7. device as claimed in claim 1, it is characterized in that, described device also comprises: the alarm input circuit be connected with described controller;
Described alarm input circuit, for obtaining alerting signal, and is sent to described controller by the alerting signal of reception.
8. the device according to any one of claim 1 ~ 7, is characterized in that, described device also comprises: the electric current and voltage Acquisition Circuit be connected with described controller;
Described electric current and voltage Acquisition Circuit, for obtaining the voltage and current of described DC load, and is sent to controller by the voltage and current of acquisition.
9. device as claimed in claim 8, it is characterized in that, described device also comprises: the temperature collection circuit be connected with described controller;
Described temperature collection circuit, for obtaining the temperature of described DC load, and is sent to controller by the temperature of acquisition.
10. device as claimed in claim 9, it is characterized in that, described device also comprises: the display be connected with described controller;
Described controller, also for the voltage received, electric current and temperature are forwarded to described display;
Described display, for showing the voltage received, electric current and temperature.
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| CN201510641374.6A CN105182251A (en) | 2015-09-30 | 2015-09-30 | DC load automatic loading device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510641374.6A CN105182251A (en) | 2015-09-30 | 2015-09-30 | DC load automatic loading device |
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| CN105182251A true CN105182251A (en) | 2015-12-23 |
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| CN201510641374.6A Pending CN105182251A (en) | 2015-09-30 | 2015-09-30 | DC load automatic loading device |
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Cited By (1)
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Application publication date: 20151223 |