CN110061476A - Power supply device with overcurrent protection - Google Patents
Power supply device with overcurrent protection Download PDFInfo
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- CN110061476A CN110061476A CN201910419132.0A CN201910419132A CN110061476A CN 110061476 A CN110061476 A CN 110061476A CN 201910419132 A CN201910419132 A CN 201910419132A CN 110061476 A CN110061476 A CN 110061476A
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- 238000001514 detection method Methods 0.000 claims abstract description 56
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 230000007257 malfunction Effects 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Rectifiers (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of power supply device with overcurrent protection; over-current detection is carried out using the detection resistance being arranged on the DC bus of the side DC/AC power conversion circuit DC; it can be to avoid when inverting output terminal detects; lower back crystal malfunctions the problem for causing overcurrent that can not be detected in the detection delay as caused by LC filter circuit and DC/AC power conversion circuit.And, due to the symmetry of the side DC/AC power conversion circuit DC DC bus current, current direction regardless of DC/AC outlet side, as long as DC/AC supplying energy is to load end, effective current on direct current side bus is a direction, therefore over-current detection, which is not necessary to be divided into positive and negative half cycle, remerges or is compared again after rectifying, and enormously simplifies circuit, improves detection efficiency.
Description
Technical field
The present invention relates to a kind of power supply devices, turn the alternating current-direct current of AC output more particularly to a kind of DC with overcurrent protection
Power supply device.
Background technique
Currently, can usually cause some member devices in circuit in power technique fields, when load short circuits, failure overcurrent
Part flows through high current, especially power tube, if not taking corresponding protection precautionary measures, may result in the burning of Primary Component
It ruins, even whole circuit board damage can not work normally power supply.Current foldback circuit is exactly that one kind is protected in this case
Protect the circuit that entire circuit keeps its not damaged.
In the application of usual power supply product, power switch tube is the main object of overcurrent protection, traditional at present
Solution is mainly include the following types: method carries out current detecting first is that exporting in rear class inversion, and control circuit is according to load electricity
Flow valuve controls power tube on-off, having the function that overcurrent protection.The defect of such overcurrent mode is: over-current detection circuit palpus
It is divided into positive and negative half cycle and detects respectively and remerge or using rectification circuit, carry out the comparison of signal after rectification again, design circuit is multiple
It is miscellaneous；In addition, turnaround time is serious after causing detection to be protected since the LC filter circuit in inverting output terminal has the presence of bulky capacitor
Delay, cannot detect overcurrent in time, device is easy to cause to burn.
Method is second is that detect electric current on the ac bus of the prime AC/DC of inverse cascade DC/AC, control circuit is according to prime
Bus current size controls power tube on-off, to realize protection.Such as number of patent application CN201010584800.4, a kind of sine
The double overcurrent protection circuit of inverter, the prime bus current detection disclosed, is on the ac bus of prime rectifier bridge
By mutual inductor and rectifier bridge rectification detection electric current, the detection of prime bus current is realized, defect is to need to pass through mutual inductor
High current is converted to low current branch and passes through rectification circuit, rectification circuit connecting detection resistance, design circuit complexity again.
Scheme comes whether decision circuitry goes out third is that be sampled analysis to DC bus high pressure by setting divider resistance
Existing short circuit or over current fault are protected to realize.It is acted by sampling analysis realization later, it is slow that protection act executes speed.
Summary of the invention
It is an object of the invention to overcome prior art defect, a kind of power supply device with overcurrent protection is provided, is passed through
Simple structure of modification realizes timely over-current detection and protection.
The present invention adopts the following technical scheme:
A kind of power supply device with overcurrent protection, including DC/AC power conversion circuit, current detection circuit, reference circuit and
Comparison circuit, it is characterised in that: current measuring element is set on the side the DC DC bus of the DC/AC power conversion circuit, institute
It states current detection circuit and the electric current flowed through on the DC bus is detected by the current measuring element, reference circuit generates one
The output end of reference voltage, current detection circuit and reference circuit is connected respectively to the input terminal of comparison circuit, and comparison circuit is defeated
Flow control signals are crossed out and control driving circuit to PWM, control the power tube of DC/AC power conversion circuit.
Beneficial effect
The present invention carries out over-current detection using the detection resistance being arranged on the DC bus of the side DC/AC power conversion circuit DC, can
To avoid when inverting output terminal detects, in the detection delay as caused by LC filter circuit and DC/AC power conversion circuit
Lower back crystal malfunctions the problem for causing overcurrent that can not be detected.Also, due to the side DC/AC power conversion circuit DC DC bus
The symmetry of electric current, the current direction regardless of DC/AC outlet side, as long as DC/AC supplying energy, to load end, DC side is female
Effective current on line is a direction, therefore over-current detection is not necessary to be divided into after positive and negative half cycle is remerged or rectified and carry out again
Compare, enormously simplify circuit, improves detection efficiency.Meanwhile the present invention detects the electric current on DC/AC the same level DC bus,
And electric current on the different ac bus for having traditional detection its prime AC/DC, avoid mutual inductor and low current signal rectification electricity
The design on road, simplifies circuit.Since the circuit for detecting of electric current detection is in the side DC of DC/AC, avoid being made because of output filtering LC
At detection time delay, therefore, circuit detecting bandwidth can be improved to 10 frequencys multiplication of switching frequency, the effective protection circuit that promoted
The speed of detecting and protection.
Detailed description of the invention
Fig. 1 is the power supply device schematic block diagram that the present invention has overcurrent protection；
Fig. 2 is over-current detection circuit equivalent model figure of the present invention；
Fig. 3 is positive 1/4 period, full-bridge DC/AC power tube, DC side and inverter side current waveform figure；
Fig. 4 is minus 3/4 period full-bridge DC/AC power tube, DC side and inverter side current waveform figure；
Fig. 5 is the waveform diagram of DC side electric current iIN and reference voltage Vref；
Fig. 6 is electric current detection amplification filtering and biasing circuit；
Fig. 7 is biasing circuits detection current waveform figure；
Fig. 8 is for generating the reference circuit figure for comparing level.
Specific embodiment
If Fig. 1 is the power supply device schematic block diagram that the present invention has overcurrent protection
Power supply device include power conversion DC/AC full-bridge circuit 1, LC filter circuit 2,3 comparison circuit 6 of current detection circuit and
PWM controls driving circuit.Electric power outputting current Io to load.DC bus in the side power conversion DC/AC full-bridge circuit 1DC
Over-current detection resistance Rs is concatenated on GND-I, current detection circuit 3 is flowed through on DC bus GND-I using detection resistance Rs detection
Electric current, after signal amplification and RC High frequency filter, output voltage to comparison circuit 6, the benchmark generated with reference circuit 5 is electric
Pressure ratio exports the control signal to PWM control driving circuit more afterwards, controls the on-off of power tube.Using detection electricity in the present embodiment
Resistance, can also use Hall current sensor in other embodiments.
Fig. 2 is over-current detection circuit equivalent model figure of the present invention.DC/AC inversion full-bridge DC side DC bus is equipped with detection
Resistance Rs is used to detect electric current iIN, DC/AC inversion full-bridge outlet side connection LC filter circuit and load on DC bus, LC
Inductive current iL and load current iOUT on filter circuit can be AC or DC.It flows through and is detected on DC/AC DC bus
The iIN electric current of resistance, no matter DC/AC output is AC or DC, as long as DC/AC supplying energy is to load end, direct current side bus
On iIN effective current be set direction.
Fig. 3 is positive 1/4 period, full-bridge DC/AC power tube, DC side and inverter side current waveform figure.
Only shown in positive half cycle, figure in positive 1/4 period, reference voltage Vref be located at triangular carrier amplitude 0.5 to 1 it
Between, power tube Q1, Q3 and Q2, Q4 are in the point of intersection alternate conduction of reference voltage Vref and triangular carrier, inversion outlet side inductance
The direction electric current iL is forward direction, and electric current forward direction is gradually increased, and DC side electric current iIN waveform is power tube Q1, Q3 and Q2, Q4 current wave
Shape iQ1, iQ3 and current waveform iQ2, iQ4 folded and.
Fig. 4 is minus 3/4 period full-bridge DC/AC power tube, DC side and inverter side current waveform figure；In negative half period, figure
It only shows in minus 3/4 period, reference voltage Vref is located between the 0 to 0.5 of triangular carrier amplitude, power tube Q1, Q3 and Q2, Q4
In the point of intersection alternate conduction of reference voltage Vref and triangular carrier, the inversion outlet side direction inductive current iL is negative sense, electric current
Negative sense is gradually increased, and DC side electric current iIN waveform remains as power tube Q1, Q3 and Q2, Q4 current waveform iQ1, iQ3 and current wave
Shape iQ2, iQ4 folded and.
Fig. 5 is the waveform diagram of DC side electric current iIN and reference voltage Vref；The waveform of DC side electric current iIN without
It is the same by the positive half cycle or negative half period in reference voltage Vref, is in shuttle shape.
Direction by the inductive current iL of full-bridge DC/AC outlet side it can be seen from Fig. 3, Fig. 4, Fig. 5 is just within the period
To, inverse change, traditional DC/AC overcurrent protection detects the electric current for flowing through inductance both for the electric current for being output to load
IL is detected, is compared, and then generates protection signal, thus should detect it is positive also to detect reversed, circuit design is multiple
It is miscellaneous；The present invention detects the electric current iIN on full-bridge DC/AC direct current side bus, the electric current iIN on full-bridge DC/AC direct current side bus without
By full-bridge DC/AC outlet side current direction how, waveform is the same, and (can be seen that amplitude in the iIN of Fig. 3 and Fig. 4
Height is the peak value for exporting electric electric current, and positive half cycle energy is also greater than negative half period energy, no matter therefore positive and negative half cycle be
Energy output, can use this electric current as over-current detection), therefore this programme is the input current iIN progress for DC/AC
Detection, the electric current for going image to export, this mode can not only directly detect component to be protected (SiC MOSFET) output overcurrent
State, while can detecte overcurrent caused by the malfunction of lower back crystal.Moreover no matter because input current is in DC/AC output
It is positive half cycle or negative half-cycle current is all symmetrical, therefore over-current detection circuit is not necessary to be divided into positive and negative half cycle to detect respectively and close again
And or using the comparison for carrying out signal after rectifier circuit rectifies again, enormously simplify circuit structure.
Details are as follows for each section circuit and principle of overcurrent protection of the present invention:
If Fig. 6 is electric current detection amplification filtering and biasing circuit.
LC filter circuit 2 is formed as combined by passive component LC, the voltage that LC filter circuit 2 will be sent out by DC/AC full-bridge 1
PWM waveform is filtered into the output waveform of setting, and current detection circuit 3 is electric by the PWM of electric current iIN using RC high-frequency filter circuit
Stream signal high frequency filters out, and obtains the electric current Io close to output.Current detection circuit 3 mainly includes RC High frequency filter amplifier
U602A, two input terminals of amplifier are separately connected the both ends Iin+ and Iin- of detection resistance Rs, and circuit uses RC circuit simulation LC
Circuit filtering bandwidth, due to circuit for detecting modify avoided to the side DC of DC/AC because output filter LC caused by detection time
Delay, therefore, circuit detecting bandwidth can be improved to 10 frequencys multiplication of switching frequency (frequency of DC/AC switching switch), effective to be promoted
Protect the speed of detecting and the protection of circuit.
And then make measure DC/AC full-bridge input current iIN can simulation data electric current Io function, to reach current-limiting protection
Function.Therefore the current waveform of 3 gained of current detection circuit is equivalent to the electric current Io that LC filter circuit 2 is filtered to export.
The amplifier anode of current detection circuit 3 connects biasing circuit 4, and biasing circuit 4 is added in current detection circuit 3
One offset dc-bias, biasing circuit 4 mainly include voltage follower U602B, and the positive input of voltage follower connects
It connects between divider resistance, output end is connected to the amplifier anode of current detection circuit 3 through RC filtering.Fig. 7 is that biasing is set
Circuit detects current waveform figure；
Such as Fig. 7, that uppermost waveform is the original waveform that current detection circuit 3 exports when biasing circuit 4 not being added in figure,
That intermediate waveform is that original waveform has been pulled up the waveform after an offset biasing after biasing circuit 4 is added, last
One waveform is that electric current is pulled up the waveform after biasing in underloading, middle load and high load respectively.Due to protective current point be can
By formula setting, if set point can be in close proximity to no-voltage in the state of underloading, circuit is highly susceptible to interfere at this time
And malfunction, therefore, the voltage that current detection circuit 3 is exported pulls up an offset voltage bias, even if being set in low electricity
Stream protection point also can substantially reduce the chance interfered by the noise on systematically on offset voltage, far from zero potential,
Therefore noise jamming can be prevented and make to act bad.
Fig. 8 is the reference circuit figure for generating benchmark voltage.Relative to traditional reference voltage by the electricity fixed
Pressure provides, and reference voltage of the invention is generated by the PWM reference circuit 5 being dynamically adapted, such as Fig. 8, and circuit overcurrent of the present invention is protected
The benchmark of shield is generated by reference circuit 5, is set by way of high speed PWM, PWM is inputted by the end CYC RST, through optocoupler
Isolator U607 isolation transmitting, then integrated by RC and generate a reference voltage.Therefore circuit can be by program-controlled, and dynamic following is defeated
Voltage setting protection point out.Circuit is transmitted using the isolation that PWM carries out linear signal, can avoid mistake of the signal on isolated transmission
Difference and interference, and then the signal of different earthed systems can be integrated, the function of output current limiting adjustable settings is completed in integration.
Via barrier assembly by the way of PWM, transmitting control reference voltage signal is grounded to DC/AC is reference circuit 5
System carries out the setting of overcurrent protection benchmark, so that even if the control unit for controlling flow point setting adheres to separately not with full-bridge DC/AC circuit
Same earthed system remains to transmit reference signal accurately between different earthed systems.Therefore, the DSP of control DC/AC output is
Make in different earthed systems, still can carry out integral traffic control.
Finally, current detection circuit 3 provides filtering signal and 5 institute of reference circuit of the side the DC DC bus current of DC/AC
The over-current protection point of setting is compared, and when DC/AC input current iIN is greater than set point, is compared via comparison circuit 6
Compared with generation over-current signal.Signal is connected to the driving of DC/AC full bridge power component using the signal isolator of comparison circuit 6
Circuit is controlled, switch-off power pipe, and the electric current for exporting DC/AC does not continue to increase, and reaches the function of overcurrent protection.
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without creative efforts
Range.
Claims (6)
1. a kind of power supply device with overcurrent protection, including DC/AC power conversion circuit, current detection circuit, reference circuit
And comparison circuit, it is characterised in that: current measuring element is set on the side the DC DC bus of the DC/AC power conversion circuit,
The current detection circuit flows through the electric current on the DC bus by current measuring element detection, and reference circuit generates
The output end of one reference voltage, current detection circuit and reference circuit is connected respectively to the input terminal of comparison circuit, comparison circuit
Output overcurrent controls signal and controls driving circuit to PWM, controls the power tube of DC/AC power conversion circuit.
2. power supply device as described in claim 1, it is characterised in that: the current measuring element is detection resistance, the inspection
The both ends of measuring resistance are respectively connected to the forward and reverse input terminal of the amplifier of current detection circuit, the amplifier it is reversed defeated
Enter connection RC high-frequency filter circuit between end and output end, the input terminal of the amplifier also sets up biasing circuit, described
A direct current amount of bias is added on DC bus current.
3. power supply device as claimed in claim 2, it is characterised in that: the biasing circuit includes a voltage follower, the electricity
The positive input of pressure follower is connected between divider resistance, and output end connects the input terminal of the current detection circuit.
4. power supply device as described in claim 1, it is characterised in that the DC/AC power conversion circuit is full-bridge circuit.
5. power supply device as described in claim 1, it is characterised in that: the reference circuit inputs programmable pwm signal warp
Barrier assembly output provides the reference voltage of dynamic following output voltage setting protection point.
6. power supply device according to claim 5, it is characterised in that: the PWM is integrated by light-coupled isolation, then by RC
Generate reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910419132.0A CN110061476A (en) | 2019-05-20 | 2019-05-20 | Power supply device with overcurrent protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910419132.0A CN110061476A (en) | 2019-05-20 | 2019-05-20 | Power supply device with overcurrent protection |
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| CN110061476A true CN110061476A (en) | 2019-07-26 |
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| CN201910419132.0A Pending CN110061476A (en) | 2019-05-20 | 2019-05-20 | Power supply device with overcurrent protection |
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| CN108233347A (en) * | 2016-12-14 | 2018-06-29 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of brushless motor controller Over Current Protection System and over-current protection method |
| CN106711954A (en) * | 2017-03-10 | 2017-05-24 | 常熟理工学院 | Fast-response over-current and short-circuit protection circuit |
| CN107591777A (en) * | 2017-10-02 | 2018-01-16 | 佛山中锦微电科技有限公司 | Overcurrent protective power driving circuit and motor-drive circuit |
| CN207835143U (en) * | 2018-03-02 | 2018-09-07 | 电子科技大学中山学院 | Energy storage device of photovoltaic power generation system |
| CN108574259A (en) * | 2018-06-22 | 2018-09-25 | 深圳市高胜科研电子有限公司 | A kind of protective device of direct current supply, system and control method |
| CN109633356A (en) * | 2018-12-29 | 2019-04-16 | 南京钰吉电气科技有限公司 | The recognition methods of electricity cut-off type electric leakage signal and electricity cut-off type electric leakage detector |
| CN209626955U (en) * | 2019-05-20 | 2019-11-12 | 江苏凯创电子科技有限公司 | Power supply device with overcurrent protection |
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