CN201707352U - Multi-input channel electric energy feedback type electronic load based on bus framework - Google Patents
Multi-input channel electric energy feedback type electronic load based on bus framework Download PDFInfo
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- CN201707352U CN201707352U CN 201020194128 CN201020194128U CN201707352U CN 201707352 U CN201707352 U CN 201707352U CN 201020194128 CN201020194128 CN 201020194128 CN 201020194128 U CN201020194128 U CN 201020194128U CN 201707352 U CN201707352 U CN 201707352U
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Abstract
The utility model relates to a multi-input channel electric energy feedback type electronic load based on a bus framework, comprising a plurality of DC/DC modules and a MCU (Microprogrammed Control Unit) bus control loop for controlling each DC/DC module, wherein the MCU bus control loop and the DC/DC modules are respectively positioned on different PCBs (Printed Circuit Boards), the DC/DC modules are provided with direct-current input ends, direct-current output ends and control input ends, the control input ends of the DC/DC modules are connected with the control output end of the MCU bus control loop through buses, and the direct-current output ends of the DC/DC modules are connected to the same set of direct-current buses in parallel so that electric energy is reutilized. The electronic load also comprises an upper computer on which a communication interface capable of communicating with the MCU bus control loop is arranged. The multi-input channel electric energy feedback type electronic load has the advantages of multi-channel input, strong expansibility, channel modularization, convenient use and maintenance and the like, and can be mainly used for detecting direct-current power supplies.
Description
Technical field
The utility model relates to direct current energy control and switch technology field, particularly a kind of electronic load that is used for the power source aging detection.
Background technology
In the production technology of modern direct supply (as: communication power supply, computer power supply, electric supply, laptop), the fully loaded aging processing step that is absolutely necessary that detects of power supply.During aging the detection, early stage generally adopt and also have the load of use to be mainly ohmic load at present, the direct current energy that direct supply is exported in this load converts thermal energy consumption to and falls, therefore power consumption is big, there is disaster hidden-trouble owing to generate heat simultaneously, in addition, because ohmic load can not change resistance flexibly, when the power supply of needs aging detection different capacity or electric pressure, different resistance need be changed, when in enormous quantities wearing out, a large amount of manpowers need be expended.
Another kind of technology is to absorb and the consumption direct current energy by the energy-dissipating type electronic load.Shortcomings such as this technology is except having the big shortcoming of same power consumption with ohmic load, also exists to cost an arm and a leg, and the few and volume of input channel is big.
A kind of in recent years new energy-conservation feedback type electronic load technology is increasingly mature.This technology is controlled, is changed by the output electric energy to power supply, finally realizes the utilization again of electric energy, has solved the shortcomings of a large amount of power consumptions of ohmic load and energy-dissipating type electronic load effectively, has advantages such as multiple input path, volume are little, easy to use simultaneously.But existing energy-conservation feedback type electronic load modes that comprise a plurality of DC/DC change-over circuits and control loop on the pcb board that adopt when realizing the multiple input path design realize more, in case a passage in a plurality of input channels breaks down or control loop breaks down, just need to change whole pcb board, so the disadvantage of this design is a channels designs can not modularization, and the input channel number is difficult for expansion, and operation and maintenance is all very inconvenient.
The utility model content
In order to solve above-mentioned contradiction, the utility model provides a kind of multiple input path electric energy feedback type electronic load based on bus architecture, can realize that a MCU (Micro ControllerUnit) bus control panel carries out full-digital control to a plurality of separate DC/DC modules simultaneously, and the input electric energy of different value can be converted to unified direct current output electric energy so that this electronic load part and whole duty also can be set and show to the utilization again of electric energy easily.Flexible and changeable, advantages such as extendability strong, path modular, operation and maintenance convenience that this electronic load has.
The technical scheme that the utility model adopted is:
A kind of multiple input path electric energy feedback type electronic load based on bus architecture, comprise a plurality of DC/DC modules and the MCU bus control loop that is used to control described each DC/DC module, described MCU bus control loop lays respectively on the different pcb boards with described DC/DC module, described DC/DC module is provided with direct-flow input end, dc output end and control input end, and the control input end of described DC/DC module connects the control output end of described MCU bus control loop by bus.
The dc output end of described DC/DC module is connected in parallel on the same group of dc bus.
Described DC/DC module comprises DC/DC translation circuit and the PWM driving circuit that described DC/DC translation circuit is controlled, the direct-flow input end of described DC/DC translation circuit and dc output end constitute the direct-flow input end and the dc output end of described DC/DC module respectively, and the control input end of described PWM driving circuit constitutes the control input end of described DC/DC module.
Useful technique effect of the present utility model is:
1, owing to adopted bus architecture, control the DC/DC module of a plurality of parallel connections by a MCU bus control panel, allow to select according to actual needs the quantity of DC/DC module thus, have superpower dirigibility, applicability and extendability;
2, because MCU bus control panel and DC/DC module can be provided with respectively and change, make that maintenance and replacing are simple, and improved reliability greatly;
3, can promote the standardization of DC/DC module, thereby greatly improve its production efficiency, reduce its production cost;
4, be convenient to the upgrading of electronic load product;
5, support a plurality of DC/DC module paired runnings, thereby realize the aging detection of the tested power supply of high current capacity;
6, voltage transitions efficient of the present utility model is up to more than 90%, and the electric energy that is consumed when being used for aging the detection is compared good energy-conserving effect with adopting ohmic load or energy-dissipating type electronic load.
Description of drawings
Detection loop when Fig. 1 is used for the DC/DC power source aging for the utility model;
Detection loop when Fig. 2 wears out for the utility model is used for direct supply;
Fig. 3 is a principle of work block diagram of the present utility model;
Fig. 4 is a structure principle chart of the present utility model;
Fig. 5 is the structure principle chart with embodiment of 4 input channels of the present utility model.
Embodiment
The utility model will be protected a kind of multiple input path electric energy feedback type electronic load based on bus architecture; as Fig. 1; shown in 2; the MCU bus control loop that it comprises a plurality of DC/DC modules and is used to control described each DC/DC module; described MCU bus control loop lays respectively on the different pcb boards with described DC/DC module; MCU bus control panel among the figure is the pcb board at described MCU bus control loop place; described DC/DC module is provided with direct-flow input end; dc output end and control input end, the control input end of described DC/DC module connect the control output end of described MCU bus control loop by bus.
Described MCU bus control loop can be provided with a plurality of control output ends, and the control input end of each described DC/DC module can connect an interface respectively simultaneously, the corresponding described control output end of each described interface.Be used to connect the control output end of mutual correspondence and many groups separate conductors of control input end and constitute bundle conductor, form the bus line under the bus architecture of the present invention, described bus line or its jointly as the common communication main line that transmits information between described MCU and a plurality of described DC/DC module, constitute bus of the present invention together with each described interface.
MCU bus control loop is realized simultaneously the control respectively to a plurality of separate described DC/DC modules.Described DC/DC module and MCU bus control loop branch be located on the different pcb boards and the two based on the design that above-mentioned bus architecture is connected, make described electronic load have characteristics such as flexible and changeable, that applicability is strong, extendability strong and working service is simple.As in actual applications can be according to the difference of request for utilization, select suitable DC/DC module, have identical control interface (coupling of the compatible and electric parameter of main finger mouth hardware) as long as guarantee each DC/DC module, need not the whole electronic load of redesign research and development.Equally, if development along with modern control technology and control chip, in the time of need more upgrading MCU bus control loop or increase Be Controlled and count, the quantity that only needs to change MCU bus control loop or increase the DC/DC module also need not the whole electronic load of redesign research and development.And, described bus type framework make electronic load in maintenance, become simple, quick when safeguarding, when wherein a certain DC/DC module broke down, standard items that only need to change this DC/DC module got final product, and need not to change whole electronic load.
The dc output end of described DC/DC module is connected in parallel on same group of dc bus P, the N, and making the unification of direct current output electric energy is a value, so that the utilization again of electric energy.
Described DC/DC module comprises DC/DC translation circuit and the PWM driving circuit that described DC/DC translation circuit is controlled, the direct-flow input end of described DC/DC translation circuit and dc output end constitute the direct-flow input end and the dc output end of described DC/DC module respectively, and the control input end of described PWM driving circuit constitutes the control input end of described DC/DC module.Described DC/DC translation circuit can adopt but be not limited to following circuit: BUCK-BOOST circuit, BOOST circuit, BUCK circuit and Cuk circuit.Described PWM driving circuit adopts HF switch PWM chip, preferably adopts the DSPIC30F family chip, as DSPIC30F2023.
Other electrical equipments (for example direct supply among Fig. 1 and the DC/AC inverter among Fig. 2) that the dc output end of open circuit or described DC/DC translation circuit connects occurring for fear of the dc output end of described DC/DC translation circuit causes the overtension of described dc bus and burns device when breaking down; particularly burn the DC/DC device, described PWM driving circuit is provided with the overvoltage crowbar of the drive signal that is used for blocking described PWM driving circuit output when the dc output end voltage of described DC/DC translation circuit is higher than the overvoltage protection setting value.The so-called blockade is to instigate described PWM driving circuit to be output as zero or make described drive signal become zero when sending into described DC/DC translation circuit.
Described MCU bus control loop is provided with 16 MCU, and the control output end of described MCU constitutes the control output end of described MCU bus control loop.
For being convenient to wiring and the modular needs of promotion DC/DC, described bus can comprise bus line and a plurality of module controls interface that connects described a plurality of DC/DC modules that is respectively applied for.Described module controls interface physically can be arranged on the pcb board at described DC/DC module place, also can be arranged on the described MCU bus control panel.
Described module controls interface preferably be provided with the voltage signal feedback line of the direct-flow input end voltage signal that is used to gather described DC/DC translation circuit, the current signal feedback line and being used to that is used to gather the direct-flow input end current signal of described DC/DC translation circuit gather described DC/DC translation circuit the dc output end voltage signal the output voltage signal feedback line and be used for control outlet line to described PWM driving circuit output control signal.Described MCU also is provided with the A/D conversion interface circuit, and the voltage, the current analog signal that are used for above-mentioned each feedback line is sent here carry out analog to digital conversion.
Many and the complicated application of control function for the reference mark also can adopt a plurality of MCU to divide into groups to control.
Each described DC/DC module sends electric current (or voltage) signal of its input end to described MCU through described module controls interface, described MCU is according to the aging demand of power supply to be measured simultaneously, send the signal instruction of size of current (or voltage swing) through described module controls interface to each described DC/DC module, thereby control the size of current (or voltage swing) of the direct-flow input end of described DC/DC module.
Can utilize the built-in control program of described MCU to realize the reliability of described electronic load and dirigibility all being improved to the direct-flow input end electric current of described DC/DC module and/or the closed-loop control of voltage.For the course of work of MCU is described, be example only with constant current (or constant voltage) control closed loop, as shown in Figure 3, electric current (or voltage) signal of the direct-flow input end of the described DC/DC module that the current signal feedback line of described MCU and voltage signal feedback line will be gathered is respectively sent into the comparing element of constant current (or constant voltage) control of described MCU, and compare from the given electric current of user (or voltage) signal that given signal input part receives with described MCU bus control loop, if the electric current (or voltage) of feedback value is worth greater than given electric current (or voltage), then output can reduce the control signal of the drive signal dutycycle of described PWM driving circuit output, otherwise, then output can increase the control signal of the drive signal dutycycle of described PWM driving circuit output, promptly constitutes constant current (or constant voltage) control closed loop.
The needs that use according to reality can only be provided with in described constant current control closed loop or the constant voltage control closed loop, also can be the two and deposit (as shown in Figure 1), when constant current, when constant voltage control closed loop exists simultaneously, during the work of the described constant current control of palpus control closed loop, described constant voltage control closed loop quits work, when described constant voltage control closed loop was worked, described constant current control closed loop quit work equally.
The given electric current of user (or voltage) signal that receives when described MCU bus control loop changes, same principle also can realize dynamic control, therefore the utility model not only can be used for constant current, constant voltage, constant-resistance, the control of permanent power, can also be used for variable load control.
Can also utilize the voltage-limiting protection of the built-in control program realization of described MCU to described DC/DC module; as the output voltage signal feedback line of MCU as described in can utilizing will gather as described in the dc output end voltage signal of DC/DC translation circuit send into as described in the voltage-limiting protection comparing element of MCU; and compare with given voltage-limiting protection setting value; if the dc output end voltage signal of gathering is higher than described voltage-limiting protection setting value; then limit the output of described MCU, thereby suppress the further rising of the dc output end voltage of described DC/DC module.
As shown in Figure 1, described multiple input path electric energy feedback type electronic load based on bus architecture can also comprise direct supply, the AC side of described direct supply connects AC network, the DC side of described direct supply is drawn the connection terminal that is used to connect DC/DC power input to be measured, the direct-flow input end of described DC/DC module is drawn the connection terminal that is used to connect described DC/DC power output end to be measured, and described dc bus inserts the DC side of described direct supply.Be transported to the input side that electric energy on the described dc bus can directly be admitted to described DC/DC power supply to be measured and utilize again, thereby realize energy-conservation purpose.
As shown in Figure 2, described multiple input path electric energy feedback type electronic load based on bus architecture can also comprise the DC/AC inverter, the AC side of described DC/AC inverter connects AC network, the AC side of described DC/AC inverter is drawn the connection terminal of the input end that is used to connect direct supply to be measured, the direct-flow input end of described DC/DC module is drawn the connection terminal that is used to connect described dc power output end to be measured, and described dc bus inserts the DC side of described DC/AC inverter.The electric energy that is transported on the described dc bus feeds back to electrical network after described DC/AC inverter is transformed into alternating current by direct current, supply with described direct supply to be measured and utilize, thereby realize energy-conservation purpose.
Be the situation that described electronic load is used for detecting simultaneously a plurality of tested power supplys shown in Fig. 1,2, can also make a plurality of DC/DC module paired runnings of described electronic load in the practical application, utilize the DC/DC module on a plurality of parallel branches to shunt, realization is to the detection of wearing out of the power supply of a high current capacity, and require described electronic load to have the constant current control function this moment.
The described electronic load of aforementioned various institutional framework forms can be provided with host computer, and described host computer is provided with the communication interface that can communicate with described MCU bus control loop.Described host computer is meant various can communicating with described MCU, and can receive the given signal of the artificial input of user and pass to the device of described MCU, can use a computer in the practical application or industrial computer maybe can be realized other monitoring units of function of the same race.It is more convenient, convenient to use host computer that the user is set.In addition, can make full use of the power of the aspect such as demonstration, storage, calculating of described host computer, in conjunction with and described MCU bus control loop between communication function, with described DC/DC module or described electronic load, even the duty of whole ageing tester is friendly and present to the user all sidedly, can also in host computer, retain test data, also can further utilize the special software in the described host computer that test data is carried out real-time analysis and processing.
Voltage transitions efficient of the present utility model is up to more than 90%, and the electric energy after its conversion through inversion module inversion loopback electrical network, greatly reduces the energy consumption of power source aging when detecting.The efficient of the efficient when exporting with Switching Power Supply rated power, efficient of the present utility model and inversion module is distributed as 90%, 93% and 90% for example, adopt the utility model to wear out when detecting, the electric energy power that consumes is 24.67% of Switching Power Supply rated power, and as adopting ohmic load or energy-dissipating type electronic load, then the electric energy power of Xiao Haoing is 100% rated power.Adopt the utility model to can save energy 72.9% by contrast, benefit is considerable.
Electronic load of the present utility model has multiple input path, owing to adopt the bus type framework, therefore extended capability is strong, its structural principle as shown in Figure 4, by described module controls interface, described MCU receives dc output end voltage signal, direct-flow input end voltage signal and/or the direct-flow input end current signal of described DC/DC translation circuit from described DC/DC module, is used to control the described control signal of described PWM driving circuit then to described DC/DC module output.
Multiple input path makes this electronic load make burn-in test at a plurality of power supplys to be measured simultaneously, certainly do not get rid of described DC/DC module yet and be one electronic load, in conjunction with commercial Application reality, commonly used can be as shown in Figure 5 the electronic load with 4 input channels can be tested 4 power supplys independently to be measured separately at most simultaneously.
Claims (10)
1. multiple input path electric energy feedback type electronic load based on bus architecture, it is characterized in that the MCU bus control loop that it comprises a plurality of DC/DC modules and is used to control described each DC/DC module, described MCU bus control loop lays respectively on the different pcb boards with described DC/DC module, described DC/DC module is provided with direct-flow input end, dc output end and control input end, and the control input end of described DC/DC module connects the control output end of described MCU bus control loop by bus.
2. the multiple input path electric energy feedback type electronic load based on bus architecture according to claim 1 is characterized in that the dc output end of described DC/DC module is connected in parallel on the same group of dc bus.
3. the multiple input path electric energy feedback type electronic load based on bus architecture according to claim 2, it is characterized in that described DC/DC module comprises DC/DC translation circuit and the PWM driving circuit that described DC/DC translation circuit is controlled, the direct-flow input end of described DC/DC translation circuit and dc output end constitute the direct-flow input end and the dc output end of described DC/DC module respectively, and the control input end of described PWM driving circuit constitutes the control input end of described DC/DC module.
4. the multiple input path electric energy feedback type electronic load based on bus architecture according to claim 3 is characterized in that described PWM driving circuit is provided with the overvoltage crowbar of the drive signal that is used for blocking described PWM driving circuit output when the dc output end voltage of described DC/DC translation circuit is higher than the overvoltage protection setting value.
5. the multiple input path electric energy feedback type electronic load based on bus architecture according to claim 4 is characterized in that described MCU bus control loop is provided with MCU, and the control output end of described MCU constitutes the control output end of described MCU bus control loop.
6. the multiple input path electric energy feedback type electronic load based on bus architecture according to claim 5 is characterized in that described bus comprises bus line and a plurality of module controls interface that connects described a plurality of DC/DC modules that is respectively applied for.
7. the multiple input path electric energy feedback type electronic load based on bus architecture according to claim 6 is characterized in that the output voltage signal feedback line of the dc output end voltage signal that described module controls interface is provided with the voltage signal feedback line of the direct-flow input end voltage signal that is used to gather described DC/DC translation circuit, the current signal feedback line and being used to that is used to gather the direct-flow input end current signal of described DC/DC translation circuit is gathered described DC/DC translation circuit and is used for control outlet line to described PWM driving circuit output control signal.
8. according to the described multiple input path electric energy feedback type electronic load of arbitrary claim among the claim 1-7 based on bus architecture, it is characterized in that it also comprises direct supply, the AC side of described direct supply connects AC network, the DC side of described direct supply is drawn the connection terminal that is used to connect DC/DC power input to be measured, the direct-flow input end of described DC/DC module is drawn the connection terminal that is used to connect described DC/DC power output end to be measured, and described dc bus inserts the DC side of described direct supply.
9. according to the described multiple input path electric energy feedback type electronic load of arbitrary claim among the claim 1-7 based on bus architecture, it is characterized in that it also comprises the DC/AC inverter, the AC side of described DC/AC inverter connects AC network, the AC side of described DC/AC inverter is drawn the connection terminal of the input end that is used to connect direct supply to be measured, the direct-flow input end of described DC/DC module is drawn the connection terminal that is used to connect described dc power output end to be measured, and described dc bus inserts the DC side of described DC/AC inverter.
10. according to the described multiple input path electric energy feedback type electronic load of arbitrary claim among the claim 1-7 based on bus architecture, it is characterized in that it also comprises host computer, described host computer is provided with the communication interface that can communicate with described MCU bus control loop.
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