CN206211874U - A kind of high-frequency inverter and its short-circuit protection circuit - Google Patents
A kind of high-frequency inverter and its short-circuit protection circuit Download PDFInfo
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- CN206211874U CN206211874U CN201621317533.3U CN201621317533U CN206211874U CN 206211874 U CN206211874 U CN 206211874U CN 201621317533 U CN201621317533 U CN 201621317533U CN 206211874 U CN206211874 U CN 206211874U
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Abstract
The utility model is related to protection circuit of inverter technical field, and in particular to a kind of high-frequency inverter and its short-circuit protection circuit.Including DC DC translation circuits and DC AC translation circuits；DC DC translation circuits include DC DC drive signal generation circuits, recommend booster circuit, bridge rectifier and high-pass filtering circuit, and final high-pass filtering circuit exports the DC voltage of 315 420V；DC AC translation circuits include SPWM Waveform generating circuits, MOSFET drive circuits, full bridge inverter, LC filter circuits and EMI filter circuit, and final EMI filter circuit exports pure sine wave alternating voltage.Also include short-circuit protection circuit, the short-circuit protection circuit includes auxiliary power circuit, temperature sensing circuit, fan control circuitry and full-bridge MOSFET over-current detection circuits.The characteristics of the utility model has flexible, applied widely, strong antijamming capability, the output quality of power supply is high, disclosure satisfy that actual demand substantially.
Description
Technical field
The utility model is related to protection circuit of inverter technical field, and in particular to a kind of high-frequency inverter and its short circuit are protected
Protection circuit.
Background technology
With the raising of people's quality of life, inverter is come into the middle of the life of thousands upon thousands people, and with height
Frequencyization and the trend of miniaturization.Just at present, it is reduces cost and simplified circuit, the output waveform of a big chunk inverter
Modified sine wave is designed as, modified sine wave is the square-wave voltage that middle voltage for some time is zero, modified sine wave inversion
Device haves the shortcomings that to disturb big, carrying load ability poor.When electrical appliance is powered using this electric energy, will be in electrical appliance
It is middle to produce very big vertiginous electric current to damage electrical appliance.
Sinewave inverter output waveform is pure sine wave, have disturb to external world small, carrying load ability it is strong, to electrical appliance without
The advantages of injury.The sine wave inverter of early stage is that SPWM ripples are obtained using the modulation system of pure hardware, complicated general of circuit
Using in the computer ups power very high to power quality requirements.Present sine wave inverter circuit generally uses MCU
SPWM modulation controls are carried out to Converting Unit, is allowed to obtain good AC wave shape output.It is defeated to obtain high-precision sine wave
Go out and accomplish that reliable protection then needs high performance MCU, and high performance MCU prices are high is typically only used in powerful inversion
In device, the usual power of general inverter is all in below 1000W and be all that, towards civilian product, the reduction of cost seems particularly
It is important.This kind of sinewave inverter is controlled output sine wave using the MCU of cheap low performance, and its precision is low, high order is humorous
Ripple content is big, and interference to external world is also larger；Simultaneously as MCU processing speeds are slow, output voltage stabilization degree is low or when external one
Inverter can not make timely and effectively control strategy and come to inverter when the larger load of individual impact or output short-circuit
Protected, at this time will often be damaged, this kind of inverter reliability is low, often give people to make troubles in use.
Must have comprehensive defencive function and highest cost performance, current cost performance highest inversion as the product for civilian use
Device is for vehicle-mounted and family expenses inverters, its sinewave inverter that is defined, the quasi-sine-wave inverter output waveforms side of remaining as
Ripple, the output quality of power supply is low.Although current single-chip microcomputer has begun to widely apply in pure sine wave inverter, there is price
Not as the shortcoming of pure hardware circuit, the presence of these shortcomings causes design cost to raise, limits it low anti-, interference performance high
Application on cost high-performance inverter.
Utility model content
Utility model purpose of the present utility model is：For above-mentioned problem, there is provided a kind of high-frequency inverter and
Its short-circuit protection circuit, the pure hardware circuit that High ireguency SPWM therein is made up of integrated chip in this design of the present utility model
To produce, it is to avoid needed using single-chip microcomputer it is a large amount of calculate and programming troubles；Can obtain high-quality by good design
The electric energy output of amount.The utility model has flexible, applied widely, strong antijamming capability, the output quality of power supply high
Feature, disclosure satisfy that actual demand substantially.
To achieve these goals, the technical solution adopted in the utility model is as follows：A kind of high-frequency inverter, including DC-
DC translation circuits and DC-AC translation circuits；The DC-DC conversion circuit includes DC-DC drive signal generation circuits, recommends boosting
Circuit, bridge rectifier and high-pass filtering circuit；The booster circuit input connection DC-DC drive signals of recommending produce electricity
Road output end, and be connected with the DC voltage of 10.5-14V；Recommend the output end connection bridge rectifier of booster circuit
Input；The output end of bridge rectifier connects the input of high-pass filtering circuit, and final high-pass filtering circuit exports 315-
The DC voltage of 420V；
The DC-AC translation circuits include SPWM Waveform generating circuits, MOSFET drive circuits, full bridge inverter, LC
Filter circuit and EMI filter circuit；The output end of the SPWM Waveform generating circuits connects the input of MOSFET drive circuits；
The DC voltage of output end and high-pass filtering circuit the output 315-420V of the MOSFET drive circuits is connected in parallel full-bridge
The input of inverter circuit；The output end of the full bridge inverter connects the input of LC filter circuits；The LC filtered electricals
The output end on road connects the input of EMI filter circuit, and final EMI filter circuit exports pure sine wave alternating voltage.
Further, the DC-DC drive signal generation circuits are mainly constituted with SG3525 chips；Wherein, described
5,6,7 pin of SG3525 chips connect timing resistor R18, electric capacity C6 and discharge resistance R17 respectively, that is, form oscillating circuit.
Further, the MOSFET drive circuits are special by the high-power MOS fet chip and IGBT of Int Rectifier Corp
Constituted with drive integrated circult.
Further, the full bridge inverter is driven by two groups of MOSFET drive circuits and constituted.
Further, including auxiliary power circuit, temperature sensing circuit, fan control circuitry and full-bridge MOSFET excessively streams inspection
Slowdown monitoring circuit, the auxiliary power circuit is connected with DC-DC conversion circuit and DC-AC translation circuits, and to DC-DC conversion circuit and
DC-AC translation circuits provide the voltage of stabilization；Two output ends of the temperature sensing circuit connect DC-DC drive signals product respectively
The input and fan control circuitry of raw circuit；The output end connection full-bridge inverting electricity of the full-bridge MOSFET over-current detection circuits
The input on road, the full-bridge MOSFET over-current detection circuits are used to detect two electricity of bridge arm down tube in full bridge inverter
Stream.
Further, the temperature sensing circuit is main by operational amplifier U2C, operational amplifier U2D, thermistor
R44, resistance R34, resistance R37, resistance R39, resistance R40, resistance R42, resistance R46, resistance R47, electric capacity C21, diode
D22, triode Q6, FAN+ output end, FAN- output ends and FULT output ends composition, wherein, the resistance R39 and resistance R40
Series connection, the resistance R46 and resistance R47 connect, and the thermistor R44 and resistance R42 connects, then, the resistance R39,
The free end of resistance R46 and resistance R42 is both connected on+5 power supply, the resistance R40, resistance R47 and thermistor R44's
Free end is grounded；One first branch circuit for being connected with operational amplifier U2C, institute are provided between the resistance R39 and resistance R40
The positive pole connection resistance R39 and resistance R40 of operational amplifier U2C is stated, and the positive pole of the operational amplifier U2C passes through resistance
The output end of R37 concatenation operation amplifiers U2C；The output end of operational amplifier U2C also passes through series resistance R34 connecting triodes
The ground level B of Q6；The colelctor electrode C of the triode Q6 connects the negative pole of FAN- output ends and electric capacity C21, the electric capacity C21 respectively
Positive pole connection FAN+ output ends, the triode Q6 emitter E ground connection；Set between the thermistor R44 and resistance R42
There are the second branch road and the 3rd branch road, the negative pole of the second branch road series connection operational amplifier U2C, the 3rd branch road series connection computing
The negative pole of amplifier U2D；The 4th connected with the positive pole of operational amplifier U2D is provided between the resistance R46 and resistance R47
Road；The output end of the operational amplifier U2D is connected with the positive pole of diode D22, negative pole and the FULT output ends of diode D22
Series connection, diode D22 is to send the signal to FULT output ends；Wherein, the FAN+ output ends and FAN- output end wind-receiving fans
Control circuit；The FULT outputs termination DC-DC drive signal generation circuits.
Further, the full-bridge MOSFET over-current detection circuits are main by input LG, display end LD, driving chip
IR2110SD, resistance R51, resistance R57, resistance R40, resistance R49, resistance R54, resistance R55, diode D15, diode D10,
Voltage-regulator diode D11, optocoupler U8, triode Q6, electric capacity C30 and electric capacity C31 composition；Wherein, the input LG, resistance R51,
Resistance R57, diode D15 and display end LD connect, and the diode D15 transmits signals to display end LD just to connect；It is described
Be provided with the 5th branch road for just meeting diode D10 between resistance R51 and resistance R57, the negative pole of the diode D10 connect respectively by
The one end for the filter circuit I that resistance R49 and electric capacity C30 are composed in parallel and the filtering composed in parallel by resistance R54 and electric capacity C31
One end of device circuit I I, the respective other end ends of the filter circuit I and filter circuit II are grounded, the wave filter electricity
Road II is also connected by series voltage stabilizing diode D11 with diode D10 negative poles, wherein, the voltage-regulator diode D11 positive poles connection
Filter circuit II；The voltage-regulator diode D11 positive poles are also connected the base stage B of triode Q6, the emitter E of the triode Q6
Ground connection, its colelctor electrode C is sequentially connected in series resistance R55 and photodiode；Photodiode connection the optocoupler U8, the optocoupler U8
The resistance R40 of parallel drive chip I R2110SD and ground connection again；Wherein, the input LG is connected to full bridge inverter down tube
On drive signal, the display end LD is used to judge whether the work of the inverter circuit is smooth.
In sum, by adopting the above-described technical solution, the beneficial effects of the utility model are：
1st, the utility model detects that temperature sensing circuit exists by using temperature sensing circuit to the temperature of inverter
During higher than predetermined threshold value produce the bad signal of temperature, i.e. temperature sensing circuit be output as high level and input signal disappearance after still
Output high level, this level is kept to go the output for controlling DC-DC drive signal generation circuits to make circuit shut-off drive signal, from
And inverter is stopped；Temperature sensing circuit produces temperature signal when equal to predetermined threshold value, the control fan control of this signal
Circuit so that fan control circuitry starts.The utility model is also using full-bridge MOSFET over-current detection circuits to full-bridge inverting electricity
Road detected, two electric currents of bridge arm down tube in detection full bridge inverter, when the electric current in MOSFET exceedes certain value,
Output signal causes that MOSFET drive circuits turn off MOSFET drive circuits, reaches the effect of protection MOSFET drive circuits.
2nd, pure hardware circuit that High ireguency SPWM of the present utility model is made up of integrated chip is produced, it is to avoid use monolithic
Machine and need it is a large amount of calculate and programming troubles；High-quality electric energy can be obtained by good design to export；The design is adopted
High-frequency inversion mode is used, is improved and the flexible advantage of the regulation of electrical circuit with noise reduction, reaction speed, design meets inversion electricity
Source miniaturization, lightweight, high frequency and high reliability, the development trend of low noise.
Brief description of the drawings
Fig. 1 is a kind of module frame chart of high-frequency inverter；
Fig. 2 is the module frame chart of a kind of high-frequency inverter and its short-circuit protection circuit；
Fig. 3 is the schematic diagram of temperature sensing circuit in the short-circuit protection circuit of the inverter of Fig. 2；
Fig. 4 is the schematic diagram of full-bridge MOSFET over-current detection circuits in the short-circuit protection circuit of the inverter of Fig. 2；
Fig. 5 is sine wave oscillation circuit output waveform figure；
Fig. 6 is triangular wave oscillating circuit output waveform；
Waveform when Fig. 7 is inverter output short-circuit and releasing short circuit；
Fig. 8 connects output waveform during 1 Ω resistance for inverter output end；
Fig. 9 is the simple diagram of DC-DC drive signal generation circuits.
In figure, 1.DC-DC drive signal generation circuits；2. booster circuit is recommended；3. bridge rectifier；4. high-pass filtering
Circuit；5.SPWM Waveform generating circuits；6.MOSFET drive circuits；7. full bridge inverter；8.LC filter circuits；9.EMI is filtered
Wave circuit；10. temperature sensing circuit；11. fan control circuitrys；12. full-bridge MOSFET over-current detection circuits.
Following specific embodiment will further illustrate the utility model with reference to above-mentioned accompanying drawing.
Specific embodiment
In the utility model occur MOSFET drive circuits by Int Rectifier Corp high-power MOS fet chip and
The special drive integrated circults of IGBT are constituted.
Refer to Fig. 1, a kind of high-frequency inverter, including a DC-DC conversion circuit and a DC-AC translation circuits；The DC-
It is high that DC translation circuits recommend booster circuit 2, a bridge rectifier 3 and including a DC-DC drive signal generation circuits 1,
Bandpass filter circuit 4；It is described to recommend the output end of the input of booster circuit 2 connection DC-DC drive signal generation circuits 1, and with
The DC voltage of 10.5-14V is connected；Fig. 9 is refer to, the DC-DC drive signal generation circuits 1 are main with SG3525 chip structures
Into；Wherein, 5,6,7 pin in the SG3525 chips connect timing resistor R18, electric capacity C6 and discharge resistance R17, i.e. shape respectively
Into an oscillating circuit, then produce the square-wave signal that two-way phase differs 180 ° as drive signal by oscillating circuit, carry out work(
Drive signal after rate is amplified drives Push-Pull power conversion to cause that voltage carries out voltage transformation by recommending step-up transformer, because
Correspondence is output as 315V when 10.5V is input into, and correspondence is output as 420V when 14V is input into, i.e., can be by the DC voltage of 10.5-14V
It is transformed to the alternating voltage of 315-420V.Secondly, the output end for recommending booster circuit 2 connects the input of bridge rectifier 3；
The alternating voltage for recommending the output of booster circuit 2 is changed into the DC voltage of pulsation after bridge rectifier 3.Finally, bridge rectifier
The output end of circuit 3 connects the input of high-pass filtering circuit 4, obtains 315-420V's after being smoothed through high-pass filtering circuit 4
Direct current, final high-pass filtering circuit 4 exports the DC voltage of 315-420V.Above-mentioned connection is to form a DC-DC conversion circuit.
The DC-AC translation circuits include a SPWM Waveform generating circuits 5, a MOSFET drive circuits 6, a full-bridge inverting
Circuit 7, a LC filter circuits 8 and an EMI filter circuit 9；The output end connection MOSFET of the SPWM Waveform generating circuits 5 drives
The input of dynamic circuit 6；Output end and high-pass filtering circuit 4 the output 315-420V's of the MOSFET drive circuits 6 is straight
Stream voltage parallel connects the input of full bridge inverter 7；I.e. described full bridge inverter 7 can be received and convert electricity by DC-DC
The DC voltage of the 315-420V of road output.The input of the output end connection LC filter circuits 8 of the full bridge inverter 7；
The output end of the LC filter circuits 8 connects the input of EMI filter circuit 9, the output pure sine wave of final EMI filter circuit 9
Alternating voltage.Wherein, the SPWM Waveform generating circuits 5 include sine wave oscillation circuit, triangular wave oscillating circuit and comparator
Circuit；Sine wave oscillation circuit, triangular wave oscillating circuit and the comparator circuit produced by SPWM wave generation circuits are collectively constituted
One sinusoidal pulse width modulation signal, the generation of this signal can realize the high frequency of this inverter, and SPWM Waveform generating circuits 5 are produced
Sinusoidal pulse width modulation waveshaping circuit be sent to MOSFET drive circuits 6 and drive after power amplification and driven by two groups of MOSFET
The full bridge inverter 7 of the dynamic composition of circuit 6, i.e., the output of full bridge inverter 7 is the SPWM ripples for carrying out power amplification；According to
The characteristic of SPWM modulation, what the fundamental signal that the SPWM ripples of output can just restore modulation by LC filter circuits 8 needed
AC energy；The alternating current of the output of LC filter circuits 8 exports public affairs and is used to electrical appliance through EMI filter circuit 9.
Fig. 2 is referred to, a kind of short-circuit protection circuit of high-frequency inverter includes an auxiliary power circuit, temperature sensing circuit
10th, fan control circuitry 11 and full-bridge MOSFET over-current detection circuits 12, the auxiliary power circuit and DC-DC conversion circuit and
DC-AC translation circuits are connected, and the voltage of stabilization is provided to DC-DC conversion circuit and DC-AC translation circuits；The temperature detection
Two output ends of circuit 10 connect the input and fan control circuitry 11 of DC-DC drive signal generation circuits 1 respectively；It is described complete
The output end of bridge MOSFET over-current detection circuits 12 connects the input of full bridge inverter 7, the full-bridge MOSFET excessively streams inspection
Slowdown monitoring circuit 12 is used to detect two electric currents of bridge arm down tube in full bridge inverter 7.
The circuit theory to each functional circuit of the short-circuit protection circuit of the utility model high-frequency inverter is carried out below
It is specific to introduce, Fig. 3 and Fig. 4 is referred to, temperature sensing circuit 10 and full-bridge MOSFET over-current detection circuits 12 in respectively Fig. 2
Circuit theory diagrams.
As shown in figure 3, the temperature sensing circuit 10 is main by operational amplifier U2C, operational amplifier U2D, temperature-sensitive electricity
Resistance R44, resistance R34, resistance R37, resistance R39, resistance R40, resistance R42, resistance R46, resistance R47, electric capacity C21, diode
D22, triode Q6, FAN+ output end, FAN- output ends and FULT output ends composition, wherein, the resistance R39 and resistance R40
Series connection, the resistance R46 and resistance R47 connect, and the thermistor R44 and resistance R42 connects, then, the resistance R39,
The free end of resistance R46 and resistance R42 is both connected on+5 power supply, the resistance R40, resistance R47 and thermistor R44's
Free end is grounded；One first branch circuit for being connected with operational amplifier U2C, institute are provided between the resistance R39 and resistance R40
The positive pole connection resistance R39 and resistance R40 of operational amplifier U2C is stated, and the positive pole of the operational amplifier U2C passes through resistance
The output end of R37 concatenation operation amplifiers U2C；The output end of operational amplifier U2C also passes through series resistance R34 connecting triodes
The ground level B of Q6；The colelctor electrode C of the triode Q6 connects the negative pole of FAN- output ends and electric capacity C21, the electric capacity C21 respectively
Positive pole connection FAN+ output ends, the triode Q6 emitter E ground connection；Set between the thermistor R44 and resistance R42
There are the second branch road and the 3rd branch road, the negative pole of the second branch road series connection operational amplifier U2C, the 3rd branch road series connection computing
The negative pole of amplifier U2D；The 4th connected with the positive pole of operational amplifier U2D is provided between the resistance R46 and resistance R47
Road；The output end of the operational amplifier U2D is connected with the positive pole of diode D22, negative pole and the FULT output ends of diode D22
Series connection, diode D22 is to send the signal to FULT output ends；Wherein, the FAN+ output ends and FAN- output end wind-receiving fans
Control circuit, fan work helps inverter radiating when triode Q6 is turned on；The FULT outputs termination DC-DC drive signals are produced
Raw circuit；I.e. described operational amplifier U2C can realize the function of temperature-controlled fan, and operational amplifier U2D realizes the overheat of inverter
Protection.When the temperature of thermistor R44 is increased to a timing, operational amplifier U2C reverse input ends voltage is input into less than positive
Terminal voltage, operational amplifier U2C exports high level and turns on triode Q6, and FAN+ output ends and FAN- are defeated when triode Q6 is turned on
Go out end connection fan work and help inverter to radiate.When heat dissipation wind channel is obstructed, inverter temperature can although starting fan
Can understand too high and cause to damage；I.e. when the temperature of thermistor R44 is too high, operational amplifier U2D outputs overturn, by
FULT output ends control DC-DC drive signal generation circuits are stopped, so that inverter is stopped, realize that overheat is protected
The function of shield.
Fig. 4 is referred to, the full-bridge MOSFET over-current detection circuits 12 are main by input LG, display end LD, driving core
Piece IR2110SD, resistance R51, resistance R57, resistance R40, resistance R49, resistance R54, resistance R55, diode D15, diode
D10, voltage-regulator diode D11, optocoupler U8, triode Q6, electric capacity C30 and electric capacity C31 composition；Wherein, the input LG, resistance
R51, resistance R57, diode D15 and display end LD series connection, the diode D15 transmit signals to display end LD just to connect；
The 5th branch road for just meeting diode D10 is provided between the resistance R51 and resistance R57, the negative pole of the diode D10 connects respectively
Connect the one end for the filter circuit I composed in parallel by resistance R49 and electric capacity C30 and composed in parallel by resistance R54 and electric capacity C31
One end of filter circuit II, the respective other end ends of the filter circuit I and filter circuit II are grounded, the filtering
Device circuit I I is also connected by series voltage stabilizing diode D11 with diode D10 negative poles, wherein, the voltage-regulator diode D11 positive poles
Connection filter circuit II；The voltage-regulator diode D11 positive poles are also connected the base stage B of triode Q6, the hair of the triode Q6
Emitter-base bandgap grading E is grounded, and its colelctor electrode C is sequentially connected in series resistance R55 and photodiode；The photodiode connection optocoupler U8, it is described
The resistance R40 of optocoupler U8 parallel drive chip I R2110SD and ground connection again；Wherein, the input LG is connected to full bridge inverter
On the drive signal of down tube, the display end LD is used to judge whether the work of the inverter circuit is smooth.Fig. 4 is only gived
One full-bridge MOSFET over-current detections protection circuit 12 of full bridge inverter 7, the protection electricity of another full bridge inverter 7
Road is also identical.Full-bridge MOSFET over-current detections protection circuit 12 acts only on two down tubes of full bridge inverter 7, i.e. input
On LG is connected on the drive signal of the down tube of full bridge inverter 7 or down tube drains, its principle is using MOSFET drive circuits 6
Its on state characteristic can detect the method for its conduction voltage drop to carry out the excessively stream of MOSFET drive circuits 6 close to resistance during conducting
Detection.When MOSFET drive circuits 6 are turned on, the conducting resistance that its driving voltage passes through R51, R57 and MOSFET drive circuit 6
Partial pressure, takes R57 upper ends voltage over the ground and isolates through D10, and triode Q6 base stages are added to after C13, C31 time delay；When MOSFET drives
Circuit 6 flows through excessive electric current, and when its conduction voltage drop exceedes certain value, triode Q6 conductings, optocoupler U8 internal illumination pipes flow through
Driving chip IR2110SD ends are high level by triode ON of its inside of electric current, and the now all outputs in IR2110SD ends are changed into
Low level, i.e. MOSFET drive circuits 6 are turned off, and the continuation for limiting electric current rises.
To prove that the SPWM Waveform generating circuits 5 in the utility model inverter can produce rational sine-wave oscillation electricity
Road and triangular wave oscillating circuit so that inverter can realize high frequency；And for prove the utility model in inverter it is short
The function of the full-bridge MOSFET over-current detection circuits 12 in the protection of road, i.e., to SPWM Waveform generating circuits 5 and full-bridge MOSFET mistakes
Current detection circuit 12 is tested.
SPWM Waveform generating circuits are tested
Determine that SPWM driving plates are powered normally, with the output of oscillograph test benchmark sine wave oscillation circuit.It is attached
Afterwards, tested with 1X grades of probe.Bring the related elements of sine wave oscillation circuit into formula
Calculate, learn two accurate adjustable resistances in the circuit, vibrate the signal frequency for producing and change between 35Hz-406Hz.
As shown in figure 5, two potentiometers of regulation make the sine wave that output signal is 50Hz5VVPP, the reference sinusoidal wave distortion tested
Very small frequency stabilization, illustrates that baseline sinusoidal wave oscillating circuit is reasonable in design.Oscillograph earth clip is motionless, and probe is connected into load
Ripple triangular wave output institute, adjustment precision adjustable resistance makes the frequency of carrier triangular wave reach more than 20KHz, and peak value 5.4VVPP is such as
Fig. 6, illustrates that carrier triangular wave oscillating circuit is reasonable in design.
Full-bridge MOSFET over-current detection circuits are tested
When inverter output short-circuit, the continuous power that DC-DC conversion circuit can be provided is limited, and electrolytic capacitor filter is deposited
Energy storage capacity can be such that the electric current of MOSFET drive circuits 6 in DC-AC translation circuits increases rapidly, and MOSFET drive circuits 6 bear non-
Often big instantaneous power is then damaged rapidly.Because the on state characteristic of MOSFET drive circuits 6 is close to a fixed value resistance, therefore its
Pressure drop above also rises rapidly, and this test employs the conduction voltage drop of detection MOSFET drive circuits 6, and to carry out MOSFET excessively electric
The detection circuit of stream, when the electric current of MOSFET drive circuits 6 exceedes setting value, detection MOSFET drive circuits 6 control to drive electricity
Road makes output driving pulse for low MOSFET, i.e. the rising of shut-off limitation electric current.
Short-circuit protection test is proceeded by, short circuit directly is carried out to output using tweezers during test.The work(used in circuit
Rate pipe model FQA28N50, internal resistance is 0.11 Ω, and the voltage-regulator diode voltage stabilizing value used in detection MOSFET drive circuits 6 is
5V, Fig. 7 be oscillograph storage to release the output wave that inverter after short circuit recovers normal output from normal output to being shorted to
Shape, the waveform that oscillograph is measured is the voltage waveform at resistance two ends.Fig. 8 is directly to connect a 1 Ω resistance in output end to simulate
The situation of inversion output short-circuit.Protection circuit current value such as formulaThat it is drawn is switching power tube guarantor
Peak current value during shield, the current value tested is by the average current after LC wave filters.Peak point current and average electricity
The difference of stream is the ripple current in output inductor, shown in Fig. 8 when inverter output short-circuit inverter only at each just
Two time of output very short peak current in string period of wave, although electric current is larger but because duration is very short in MOSFET
Safe range within, therefore MOSFET will not damage.
Described above is directed to the detailed description of the preferable possible embodiments of the utility model, but embodiment is not limited to
Patent claim of the present utility model, the equal change or modification completed under the technical spirit suggested by all the utility model
Change, all should belong to the utility model and cover the scope of the claims.
Claims (7)
1. a kind of high-frequency inverter, it is characterised in that including DC-DC conversion circuit and DC-AC translation circuits；The DC-DC becomes
Changing circuit includes DC-DC drive signal generation circuits, recommends booster circuit, bridge rectifier and high-pass filtering circuit；It is described
Recommend booster circuit input connection DC-DC drive signal generation circuit output ends, and with the DC voltage phase of 10.5-14V
Even；The output end for recommending booster circuit connects the input of bridge rectifier；The output end connection high pass of bridge rectifier
The input of filter circuit, final high-pass filtering circuit exports the DC voltage of 315-420V；
The DC-AC translation circuits include SPWM Waveform generating circuits, MOSFET drive circuits, full bridge inverter, LC filtering
Circuit and EMI filter circuit；The output end of the SPWM Waveform generating circuits connects the input of MOSFET drive circuits；It is described
The DC voltage of output end and high-pass filtering circuit the output 315-420V of MOSFET drive circuits is connected in parallel full-bridge inverting
The input of circuit；The output end of the full bridge inverter connects the input of LC filter circuits；The LC filter circuits
Output end connects the input of EMI filter circuit, and final EMI filter circuit exports pure sine wave alternating voltage.
2. a kind of high-frequency inverter according to claim 1, it is characterised in that the DC-DC drive signal generation circuits
Mainly constituted with SG3525 chips；Wherein, 5,6,7 pin in the SG3525 chips connect timing resistor R18, electric capacity C6 respectively
With discharge resistance R17, that is, form oscillating circuit.
3. a kind of high-frequency inverter according to claim 1, it is characterised in that the MOSFET drive circuits are whole by the world
The special drive integrated circult composition of high-power MOS fet chip and IGBT of Liu Qi companies.
4. a kind of high-frequency inverter according to claim 1, it is characterised in that the full bridge inverter is by two groups
MOSFET drive circuits drive composition.
5. according to a kind of short-circuit protection circuit of any described high-frequency inverters of claim 1-4, it is characterised in that including auxiliary
Help power circuit, temperature sensing circuit, fan control circuitry and full-bridge MOSFET over-current detection circuits, the auxiliary power circuit
Connected with DC-DC conversion circuit and DC-AC translation circuits, and stabilization is provided to DC-DC conversion circuit and DC-AC translation circuits
Voltage；Two output ends of the temperature sensing circuit connect input and the fan control of DC-DC drive signal generation circuits respectively
Circuit processed；The output end of the full-bridge MOSFET over-current detection circuits connects the input of full bridge inverter, the full-bridge
MOSFET over-current detection circuits are used to detect two electric currents of bridge arm down tube in full bridge inverter.
6. a kind of short-circuit protection circuit of high-frequency inverter according to claim 5, it is characterised in that the temperature detection
Circuit is main by operational amplifier U2C, operational amplifier U2D, thermistor R44, resistance R34, resistance R37, resistance R39, electricity
Resistance R40, resistance R42, resistance R46, resistance R47, electric capacity C21, diode D22, triode Q6, FAN+ output end, FAN- outputs
End and FULT output ends composition, wherein, the resistance R39 and resistance R40 connects, and the resistance R46 and resistance R47 connects, institute
Thermistor R44 and resistance R42 series connection is stated, then, the free end of the resistance R39, resistance R46 and resistance R42 is both connected to+
On 5 power supply, the free end of the resistance R40, resistance R47 and thermistor R44 is grounded；The resistance R39 and resistance R40
Between be provided with one first branch circuit for being connected with operational amplifier U2C, the positive pole connection resistance R39 of the operational amplifier U2C
The output end for passing through resistance R37 concatenation operation amplifiers U2C with the positive pole of resistance R40, and the operational amplifier U2C；Fortune
The output end of amplifier U2C is calculated also by the ground level B of series resistance R34 connecting triodes Q6；The colelctor electrode C of the triode Q6
The negative pole of FAN- output ends and electric capacity C21, the positive pole connection FAN+ output ends of the electric capacity C21, the triode are connected respectively
The emitter E ground connection of Q6；The second branch road and the 3rd branch road, described second are provided between the thermistor R44 and resistance R42
The negative pole of road series connection operational amplifier U2C, the negative pole of the 3rd branch road series connection operational amplifier U2D；The resistance R46 and electricity
The 4th branch road connected with the positive pole of operational amplifier U2D is provided between resistance R47；The output end of the operational amplifier U2D with
The positive pole series connection of diode D22, the negative pole of diode D22 is connected with FULT output ends, and diode D22 is to send the signal to
FULT output ends；Wherein, the FAN+ output ends and FAN- output ends wind-receiving fan control circuit；The FULT outputs termination DC-
DC drive signal generation circuits.
7. a kind of short-circuit protection circuit of high-frequency inverter according to claim 5, it is characterised in that the full-bridge
MOSFET over-current detection circuits are main by input LG, display end LD, driving chip IR2110SD, resistance R51, resistance R57, electricity
Resistance R40, resistance R49, resistance R54, resistance R55, diode D15, diode D10, voltage-regulator diode D11, optocoupler U8, triode
Q6, electric capacity C30 and electric capacity C31 are constituted；Wherein, the input LG, resistance R51, resistance R57, diode D15 and display end LD
Series connection, the diode D15 transmits signals to display end LD just to connect；It is provided with just between the resistance R51 and resistance R57
The 5th branch road of diode D10 is connect, the negative pole of the diode D10 connects what is composed in parallel by resistance R49 and electric capacity C30 respectively
One end of filter circuit I and the one end for the filter circuit II composed in parallel by resistance R54 and electric capacity C31, the wave filter
Circuit I and the respective other end ends of filter circuit II are grounded, and the filter circuit II also passes through series voltage stabilizing diode
D11 is connected with diode D10 negative poles, wherein, the voltage-regulator diode D11 positive poles connection filter circuit II；The voltage stabilizing two
Pole pipe D11 positive poles also connect triode Q6 base stage B, the triode Q6 emitter E ground connection, its colelctor electrode C is sequentially connected in series
Resistance R55 and photodiode；The photodiode connects optocoupler U8, the optocoupler U8 parallel drive chip I R2110SD again
And the resistance R40 of ground connection；Wherein, the input LG is connected on the drive signal of full bridge inverter down tube, the display end
LD is used to judge whether the work of the inverter circuit is smooth.
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| CN201621317533.3U CN206211874U (en) | 2016-12-03 | 2016-12-03 | A kind of high-frequency inverter and its short-circuit protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621317533.3U CN206211874U (en) | 2016-12-03 | 2016-12-03 | A kind of high-frequency inverter and its short-circuit protection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385195A (en) * | 2016-12-03 | 2017-02-08 | 河池学院 | High frequency inverter and short circuit protection circuit |
| CN107332213A (en) * | 2017-07-18 | 2017-11-07 | 深圳市华星光电半导体显示技术有限公司 | Current foldback circuit |
| CN109444621A (en) * | 2018-10-01 | 2019-03-08 | 徐州中矿大传动与自动化有限公司 | A kind of high-power NPC three-level inverter power module electric current online test method |
| US10637230B2 (en) | 2017-07-18 | 2020-04-28 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Over current protection circuit |
-
2016
- 2016-12-03 CN CN201621317533.3U patent/CN206211874U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385195A (en) * | 2016-12-03 | 2017-02-08 | 河池学院 | High frequency inverter and short circuit protection circuit |
| CN107332213A (en) * | 2017-07-18 | 2017-11-07 | 深圳市华星光电半导体显示技术有限公司 | Current foldback circuit |
| US10637230B2 (en) | 2017-07-18 | 2020-04-28 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Over current protection circuit |
| CN109444621A (en) * | 2018-10-01 | 2019-03-08 | 徐州中矿大传动与自动化有限公司 | A kind of high-power NPC three-level inverter power module electric current online test method |
| CN109444621B (en) * | 2018-10-01 | 2021-04-09 | 徐州中矿大传动与自动化有限公司 | Online detection method for power module current of high-power NPC three-level inverter |
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