CN100507590C - Multiple input path modular high frequency isolation single phase power feedback type electronic load - Google Patents
Multiple input path modular high frequency isolation single phase power feedback type electronic load Download PDFInfo
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Abstract
A feedback electronic load of high frequency isolated single-phase electric energy in multi-input channel modularization mode is prepared for forming each DC voltage conversion module by connecting high frequency conversion circuit and high frequency transformer as well as high frequency rectification circuit in sequence, forming inverter unit by connecting inverter and AC filter with each other, then connecting DC output end of DC voltage conversion module to DC input end of inverter unit.
Description
Technical field
The present invention relates to a kind of many load moduleizations high frequency isolation single phase power feedback type electronic load, be mainly used in fully loaded aging detection of modern Switching Power Supplies such as communication power supply, computer power supply and electric supply.
Background technology
Fully loaded aging detection of present various Switching Power Supplies adopted ohmic loads more, the defective of this load mainly is that the direct current energy that resistance will be used to detect all consumes, cause the lot of energy waste, when detecting different electrical power, also need to change different resistance in addition, use also inconvenience.
Summary of the invention
For overcoming the above-mentioned defective of prior art, the invention provides a kind of multiple input path modular high frequency isolation single phase power feedback type electronic load, the electric energy of this electronic load actual consumption is few, and easy to use.
The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of multiple input path modular high frequency isolation single phase power feedback type electronic load, comprise some DC voltage modular converters and inverter, described each DC voltage modular converter is separate, its dc output end all connects the direct-flow input end of described inverter, described each DC voltage modular converter is equipped with the input end that is used to connect tested power supply, and described inverter is provided with the output terminal that is used to connect electrical network.
Described each DC voltage modular converter and described inverter are equipped with PWM (pulse-length modulation) Drive and Control Circuit separately.
The PWM Drive and Control Circuit of described each DC voltage modular converter and the PWM Drive and Control Circuit of described inverter are connected with the shared DSP (digital signal processor) to its control.
Principle of work of the present invention is: the input end that the output of Switching Power Supply is inserted corresponding direct current voltage transformation module, set and control the electric current of DC voltage modular converter by DSP and PWM Drive and Control Circuit, make it to meet the detection requirement of tested Switching Power Supply, DC current by Switching Power Supply is converted to by inverter and meets the electrical network alternating current that requires that networks and send into electrical network after corresponding DC voltage modular converter boosts.
Because the present invention can feed back to electrical network with the electric energy major part that is used for detecting, and makes it to be reused, and has greatly reduced energy consumption; Because energy consumption of the present invention is low, the heat of generation is few, helps reducing the equipment temperature rise, avoids Yin Gaowen initiation fire or damage equipment; Because the present invention can adjust electric current by the DSP digital control approach according to the characteristics of tested Switching Power Supply, can adapt to the detection of different Switching Power Supplies, simultaneously also because the present invention is typically provided with a plurality of separate DC voltage modular converters, but the electric current independent regulation of each DC voltage modular converter, form non-interfering a plurality of sense channel, can carry out the detection of a plurality of identical or different Switching Power Supplies simultaneously, not only improve work efficiency, and greatly simplified operating personnel's work.
Description of drawings
Fig. 1 is the synoptic diagram of basic structure of the present invention and use-pattern;
Fig. 2 is the structural representation that the present invention relates to DC voltage modular converter and control section thereof;
Fig. 3 is the structural representation of DC voltage modular converter major part of the present invention;
Fig. 4 is the structural representation of the DC charging control circuit of DC voltage modular converter of the present invention;
Fig. 5 is the structural representation that the present invention relates to inverter and control section thereof;
Fig. 6 is the structural representation of inverter major part of the present invention.
Embodiment
Referring to Fig. 1, the invention provides a kind of multiple input path modular high frequency isolation single phase power feedback type electronic load, comprise some DC voltage modular converters and inverter, described each DC voltage modular converter is separate, its dc output end all connects the direct-flow input end of described inverter, described each DC voltage modular converter is equipped with the input end that is used to connect tested power supply, and described inverter is provided with the output terminal that is used to connect electrical network.
Referring to Fig. 2, described DC voltage modular converter (also can be described as the DC/DC modular converter) is used for the low voltage direct current of Switching Power Supply output is converted to the high-voltage direct current that is suitable for sending into electrical network after inversion, mainly constitute, also can adopt the prior art of other any suitable by the high-frequency conversion circuit, high-frequency transformer Tr1 and the high-frequency rectification circuit that connect successively.Described high-frequency conversion circuit is converted to DC current the high-frequency current that can be the high-frequency transformer transformation, the low pressure high frequency current transitions that described high-frequency transformer is used for high-frequency conversion circuit is sent here is the oudin's current that adapts to, and the high frequency current transitions that described high-frequency rectification circuit is used for that high-frequency transformer is sent here is a DC current.
Described DC voltage modular converter generally can preferably be recommended loop structure, to adapt to the conversion than low input.Under and the situation that electric current is less higher, also can adopt " half-bridge " or " full-bridge " conversion loop at input voltage.
Referring to Fig. 3, when loop structure is recommended in employing, described high-frequency conversion circuit mainly is made up of two MOSFET (mos field effect transistor) Q1 and Q2, primary winding of described high-frequency transformer Tr1 is provided with centre tap, the full bridge rectifier that described high-frequency rectification circuit preferably is made of 4 high-frequency rectification diode Q3-Q6, its back is connected with the filtering circuit that is made of inductance L 1 and capacitor C 1, the source electrode of described two MOSFET Q1 and Q2 all is connected in the negative input of this high-frequency conversion circuit, drain electrode is connected to the two ends of described high-frequency transformer primary winding, primary winding centre tap of described high-frequency transformer connects the electrode input end of this high-frequency conversion circuit, and output terminal connects the input end of described full bridge rectifier.During work, the output of tested Switching Power Supply is inserted the input end of described high-frequency conversion circuit, two MOSFETQ1 in this circuit and the grid of Q2 are connected the control signal corresponding line respectively, by the PWM control mode is that may command two MOSFET Q1 and Q2 replace break-make in some way, on primary winding of high-frequency transformer, form high-frequency current, again through overcommutation and filtering, can insert the described inverter of back through the oudin's current of high-frequency transformer transformation output.
Referring to Fig. 4, the input end of described high-frequency conversion circuit can be connected with electric capacity of voltage regulation C, and the front of described electric capacity of voltage regulation C can be provided with charging control circuit, is used for the charging current of control switching to described electric capacity of voltage regulation C.Because the output terminal of tested Switching Power Supply generally all can have the high capacity electrochemical capacitor, under the situation that DC voltage output is arranged, insert the input end of this product, as not carrying out current limliting, can carry out large current charge to the electric capacity of voltage regulation C of this product input end during beginning, be easy to this product input end fuse cutout and input terminal scaling loss.Input current can be limited in certain scope by the current-limiting resistance in the charging control circuit.
Described charging control circuit mainly is made of current-limiting resistance R and by-pass switch thereof, and the by-pass switch of described current-limiting resistance can adopt bypass MOSFET Q1, so that control.Be connected after described current-limiting resistance R and its by-pass switch are parallel with one another on the incoming line between this product input terminal and the described electric capacity of voltage regulation.Described charging control circuit also is provided with charging usually and detects the loop; the action that is used to detect the voltage of described electric capacity of voltage regulation and controls described by-pass switch, described charging detects the loop and is provided with the signal input line road and the output line that is connected described current-limiting resistance by-pass switch control terminal that is used to gather described electric capacity of voltage regulation both end voltage.When by-pass switch adopts bypass MOSFET Q1, its grid constitutes described control terminal, be connected with the output line of described charging control circuit, after the voltage at electric capacity of voltage regulation two ends reaches charging voltage, described charging detects the loop and applies a forward voltage greater than its threshold value by signal input line to described bypass MOSFET grid, make this MOSFET conducting, bypass described current-limiting resistance.
Described charging control circuit front can be provided with fuse cutout Fusel.
Referring to Fig. 5, described inverter is used for the direct current that each DC voltage modular converter is sent here is converted to the alternating current that is suitable for sending into electrical network, mainly be made of interconnective inverter and alternating current filter, the lead-out terminal of described inverter connects the input terminal of described alternating current filter.Export after inverter and alternating current filter filtering from the direct current of each DC voltage modular converter, form the alternating current that is suitable for inserting electrical network.Usually, the input terminal of described inverter constitutes the input end of described inverter, and the lead-out terminal of described alternating current filter constitutes the output terminal of described inverter.Also can other circuit be set, with the further characteristic of improving input current and output current at the input end of described inverter and the output terminal of described alternating current filter.
The full-bridge inverter that described inverter preferably is made of 1 full-bridge IPM can adopt structure shown in Figure 6, so that by PWM or other digital control approaches this inverter is controlled.
Referring to Fig. 6, described alternating current filter can adopt the low-pass filter of being made up of ac capacitor L2 and capacitor C 2, with filtering HF switch harmonic wave.
Referring to Fig. 1, Fig. 2 and Fig. 5, described each DC voltage modular converter and described inverter are equipped with PWM Drive and Control Circuit separately.
The PWM Drive and Control Circuit of described each DC voltage modular converter and the PWM Drive and Control Circuit of described inverter are connected with the shared DSP that it is controlled.The pwm control signal parameter of each PWM Drive and Control Circuit can deposit DSP in by form of software with the associate feature of each relevant running state parameter, is determined respectively according to running status feedback signals such as the test parameter of artificial input and relevant electric current, voltages and is controlled the dutycycle of pwm control signal of each PWM Drive and Control Circuit output and the signal parameter of other various needs controls by DSP.Because described each DC voltage modular converter and described inverter have adopted MOSFET and IPM respectively, can control the duty of each MOSFET and IPM respectively by corresponding PWM separately, realizing the control of DC voltage modular converter input current size and frequency, waveform and position control mutually to inverter output current and voltage, the detection of satisfying tested Switching Power Supply requires and the alternating current networking requirement of this product output.
The control chip of described PWM Drive and Control Circuit can adopt the SG3525 chip.
Referring to Fig. 2, control to each DC voltage modular converter is controlled to be basic control mode with constant current, described DSP is provided with the signal feedback circuit that is used to gather each DC voltage modular converter input end current signal idc, can also be provided with the signal feedback circuit that is used to gather each DC voltage modular converter input terminal voltage signal Vdc, with the display voltage situation.The current value that constant control can show by current feedback signal is with the relatively realization of electric current set-point: when the input current that shows during greater than given electric current, reduce the dutycycle of the pwm control signal of PWM Drive and Control Circuit output; When the input current that shows during, increase dutycycle less than given electric current.The signal acquisition point of described each DC voltage modular converter input end current signal feedback line can be arranged on the cathode conductor between corresponding charging control circuit and the electric capacity of voltage regulation, and the signal acquisition point of voltage signal feedback line can be arranged between corresponding input end fuse cutout and the charging control circuit.
Also should carry out overvoltage restriction control to each DC voltage modular converter, in order to avoid occur causing when open circuit or inverter break down output voltage too high and burn device in the high-pressure side.For this reason, described DSP is provided with the signal feedback circuit that is used to gather each DC voltage modular converter output end voltage signal, when DC voltage modular converter high side voltage is higher than the setting value that prestores, restriction is used for the output of the pwm control signal of constant current control, to suppress the further rising of high side voltage.The signal acquisition point of described each DC voltage modular converter output end voltage signal feedback circuit can be arranged on the output terminal of corresponding high-frequency rectification circuit.
Referring to Fig. 5; described DSP is provided with the signal feedback circuit that is used for gathering respectively inverter output terminal ac voltage signal and ac current signal; usually can also be provided with and be used for A/D conversion interface circuit that the simulating signal that described ac voltage signal feedback line and described alternating circuit signal feedback circuit are sent here is changed, to adapt to the requirement of digitized processing.Described DSP handles the ac voltage signal of input, realize the phase locking (PLL) of alternating voltage, and according to ac current signal acquisition alternating current flow valuve, the sinusoidal wave set-point of itself and the alternating current that generates according to the alternating voltage phase place is compared, realize PI control by pi regulator, and the output of described pi regulator and alternating voltage feedback data superposeed to realize feedforward control, the feed-forward control signals of producing is sent into corresponding PWM Drive and Control Circuit generate corresponding PWM, the turn-on and turn-off of each IPM in the control full-bridge inverter, the electric current of sending into electrical network with control is a sine wave, and guarantee that current phase is mutually identical with the voltage position, make power factor approach 1.
Described DSP can be provided with the led state display board, is used to data and the information such as various electric currents, voltage, frequency and waveform that show that DSP gathers and generates.
Preferred 32 the digital control panels of High Performance DSP of described DSP, its control chip is the TMS320F2812 chip.
Referring to Fig. 1, Fig. 2 and Fig. 5, the direct-flow input end of described inverter is made of anodal high voltage DC busses P and negative pole high voltage DC busses N, the positive and negative electrode lead-out terminal of described each DC voltage modular converter connects described anodal high voltage DC busses P and negative pole high voltage DC busses N respectively, realizes the connection of the dc output end of described each DC voltage modular converter with the direct-flow input end of described inverter thus.
Be provided with module interface plate, dc bus plate and diaphragm plate in the cabinet of this product, described module interface plate is provided with some integrated circuit board slots that are parallel to each other, described each DC voltage modular converter all adopts the integrated circuit board form, be plugged on the respective plate card slot of described module interface plate, described anodal high voltage DC busses and negative pole high voltage DC busses are arranged on the described dc bus plate, described diaphragm plate makes described each DC voltage converting circuit and described inverter lay respectively at its both sides between described each integrated circuit board and described inverter.Electrical connection between the circuit on described each plate can realize by the slot inserting mode between each plate, also can realize by the mode of other any suitable.Adopt this structure can realize this product and the wherein installation and removal of each several part easily, and the installation and removal of each several part all can independently be carried out.
Described each integrated circuit board is equipped with the integrated circuit board housing, described hull outside is equipped with heating radiator, housing is with the integrated circuit board gas channel that leaves sealing between the heating radiator, described diaphragm plate is provided with some fans that correspond respectively to each integrated circuit board, described each fan is the integrated circuit board gas channel on corresponding integrated circuit board separately respectively, be used for gas channel blow flow to corresponding integrated circuit board, realize separate forced draft between each DC voltage modular converter thus, guaranteed force ventilated radiating effect, and solved the problem that each DC voltage modular converter independently dispels the heat and is independent of each other effectively, improved this reliability of products and maintainability.A plurality of fans corresponding to each integrated circuit board are worked simultaneously, and the inverter that is positioned at the diaphragm plate opposite side has also been formed exhausting air-flow comparatively uniformly, help the heat radiation of inverter.
The cabinet of this product is provided with the guide rail that matches with tooth on described each heating radiator, is used to guide the plug-in mounting of integrated circuit board.Under the guiding of guide rail, integrated circuit board is pushed in the cabinet during installation, integrated circuit board can be inserted on the integrated circuit board slot of described module interface plate, install very convenient.
Claims (9)
1. multiple input path modular high frequency isolation single phase power feedback type electronic load, it is characterized in that comprising some DC voltage modular converters and inverter, described each DC voltage modular converter is separate, its dc output end all connects the direct-flow input end of described inverter, described each DC voltage modular converter is equipped with the input end that is used to connect tested power supply, and described inverter is provided with the output terminal that is used to connect electrical network.
2. multiple input path modular high frequency isolation single phase power feedback type electronic load as claimed in claim 1 is characterized in that described DC voltage modular converter mainly is made of the high-frequency conversion circuit, high-frequency transformer and the high-frequency rectification circuit that connect successively.
3. multiple input path modular high frequency isolation single phase power feedback type electronic load as claimed in claim 2, it is characterized in that described DC voltage modular converter adopts recommends loop structure, " half-bridge " conversion loop or " full-bridge " conversion loop, described employing is recommended the described high-frequency conversion circuit of the DC voltage modular converter of loop structure and mainly is made up of two MOSFET, primary winding of described high-frequency transformer is provided with centre tap, described high-frequency rectification circuit is the full bridge rectifier that is made of 4 high-frequency rectification diodes, its back is connected with the filtering circuit that is made of inductance and electric capacity, the source electrode of described two MOSFET all is connected in the negative input of this high-frequency conversion circuit, drain electrode is connected to the two ends of described high-frequency transformer primary winding, primary winding centre tap of described high-frequency transformer connects the electrode input end of this high-frequency conversion circuit, and output terminal connects the input end of described full bridge rectifier.
4. multiple input path modular high frequency isolation single phase power feedback type electronic load as claimed in claim 3, the input end that it is characterized in that described high-frequency conversion circuit is connected with electric capacity of voltage regulation, the front of described electric capacity of voltage regulation is provided with charging control circuit, described charging control circuit mainly is made of current-limiting resistance and by-pass switch thereof, be connected after described current-limiting resistance and its by-pass switch are parallel with one another on the incoming line between this product input terminal and the described electric capacity of voltage regulation, described charging control circuit also is provided with charging and detects the loop, described charging detects the loop and is provided with the signal input line road and the output line that is connected described current-limiting resistance by-pass switch control terminal that is used to gather described electric capacity of voltage regulation both end voltage, the by-pass switch of described current-limiting resistance adopts bypass MOSFET, and its grid constitutes described control terminal.
5. multiple input path modular high frequency isolation single phase power feedback type electronic load as claimed in claim 1, it is characterized in that described inverter mainly is made of interconnective inverter and alternating current filter, the lead-out terminal of described inverter connects the input terminal of described alternating current filter.
6. as claim 1,2,3,4 or 5 described multiple input path modular high frequency isolation single phase power feedback type electronic loads, it is characterized in that described each DC voltage modular converter and described inverter are equipped with PWM Drive and Control Circuit separately, the PWM Drive and Control Circuit of described each DC voltage modular converter and the PWM Drive and Control Circuit of described inverter are connected with the shared DSP that it is controlled.
7. multiple input path modular high frequency isolation single phase power feedback type electronic load as claimed in claim 6 is characterized in that described DSP is provided with the signal feedback circuit that is used to gather each DC voltage modular converter input end current signal, be used to gather the signal feedback circuit of each DC voltage modular converter input terminal voltage signal, be used to gather the signal feedback circuit of each DC voltage modular converter output end voltage signal, the A/D conversion interface circuit that is used for gathering the signal feedback circuit of inverter output terminal ac voltage signal and ac current signal respectively and is used for the simulating signal that described ac voltage signal feedback line and described ac current signal feedback line are sent here is changed.
8. as claim 1,2,3,4 or 5 described multiple input path modular high frequency isolation single phase power feedback type electronic loads, it is characterized in that being provided with in its cabinet the module interface plate, dc bus plate and diaphragm plate, the direct-flow input end of described inverter is made of anodal high voltage DC busses and negative pole high voltage DC busses, the dc output end of described each DC voltage modular converter with the connected mode of the direct-flow input end of described inverter be its just, cathode output end connects described anodal high voltage DC busses and negative pole high voltage DC busses respectively, described module interface plate is provided with some integrated circuit board slots that are parallel to each other, described each DC voltage modular converter all adopts the integrated circuit board form, be plugged on the respective plate card slot of described module interface plate, described anodal high voltage DC busses and negative pole high voltage DC busses are arranged on the described dc bus plate, described diaphragm plate is between described each integrated circuit board and described inverter, and described each DC voltage converting circuit and described inverter lay respectively at the both sides of described diaphragm plate.
9. multiple input path modular high frequency isolation single phase power feedback type electronic load as claimed in claim 8, it is characterized in that described each integrated circuit board is equipped with the integrated circuit board housing, described hull outside is equipped with heating radiator, housing is with the integrated circuit board gas channel that leaves sealing between the heating radiator, described diaphragm plate is provided with some fans that correspond respectively to each integrated circuit board, described each fan is the integrated circuit board gas channel on corresponding integrated circuit board separately respectively, and described cabinet is provided with the guide rail that matches with tooth on described each heating radiator.
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| CN 200710099161 CN100507590C (en) | 2007-05-15 | 2007-05-15 | Multiple input path modular high frequency isolation single phase power feedback type electronic load |
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