CN108092237A - A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit - Google Patents
A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit Download PDFInfo
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- CN108092237A CN108092237A CN201810103329.9A CN201810103329A CN108092237A CN 108092237 A CN108092237 A CN 108092237A CN 201810103329 A CN201810103329 A CN 201810103329A CN 108092237 A CN108092237 A CN 108092237A
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- power switch
- switch pipe
- resistance
- fast recovery
- recovery diode
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- 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
- H02H7/1225—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 responsive to internal faults, e.g. shoot-through
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- 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
- H02H7/1227—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 responsive to abnormalities in the output circuit, e.g. short circuit
Abstract
The invention discloses a kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, including three phase rectifier unit, power switch pipe full-bridge inverting unit, three HF current transformers T1, T2 and T3, inductance capacitance coupling unit, driving overcurrent short-circuit protection control unit, overcurrent short detection unit, high frequency transformer and high-frequency rectification output unit.The high frequency switch power full-bridge inverting power switch pipe overcurrent of the present invention and the principle of load over-current protection circuit type of alarm are based on current detecting; when wherein any one moment is induced more than normal electric current by HF current transformer 3T1, T2, T3; it is exported by voltage comparator and latches high level; high level signal notice driving overcurrent short-circuit protection control unit; it is made to immediately turn off the drive signal of all power switch pipes in addition; the circuit structure of the present invention is simple; stability is good; system cost is saved, there is good practicability.
Description
Technical field
The present invention relates to a kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuits, and in particular to Yi Zhonggao
Frequency Switching Power Supply full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, belong to power electronics field.
Background technology
It is largely complete using power switch pipe particularly in high-power high-frequency switch power supply industry in field of power electronics
Bridge inversion transformation technique is whole equipment since four power switch pipes in full bridge inverter will bear high voltage and high current
Critical component, thus the detection to power switch pipe and protection become key problem in technology.In the prior art to full bridge inverter
In the detections of four power switch pipes adopted the technical scheme that, when full bridge inverter works, work as power switch pipe
When G1, G4 are turned on, IC is driven to the voltage drop between the emitter and collector of power switch pipe G1, G4 by dedicated optocoupler
Vce is sampled respectively, and when voltage drop is more than preset value, optocoupler driving IC sends alarm；Equally, power switch pipe is worked as
When G2, G3 are turned on, IC is driven to the voltage drop between the emitter and collector of power switch pipe G2, G3 by dedicated optocoupler
Vce is sampled respectively, and when voltage drop is more than preset value, optocoupler driving IC sends alarm；It can be seen that this alarm side
The principle of formula is based on voltage detecting.
In order to ensure the current foldback circuit of four power switch pipes in full bridge inverter stablizes effective, development one kind
Full-bridge inverting power switch pipe overcurrent and load over-current protection circuit based on electric current are very important, and the invention also has
Important application prospect.
The content of the invention
The present invention for the above-mentioned prior art there are the problem of make improvements, a kind of full-bridge inverting power switch pipe mistake is disclosed
Stream and load over-current protection circuit.The mistake of four power switch pipes in full bridge inverter is detected and ensured based on current system
Stream protection circuit stability is effective.
In order to realize above-mentioned target, the technical solution adopted in the present invention is：
A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, which is characterized in that including three phase rectifier
Unit (1), power switch pipe full-bridge inverting unit (2), three HF current transformer (3) T1, T2 and T3, inductance capacitance couplings
Unit (4), driving overcurrent short-circuit protection control unit (5), overcurrent short detection unit (6), high frequency transformer (7), high frequency are whole
Output unit (8) is flowed,
The three phase rectifier unit (1) includes three-phase commutation bridge and filter capacitor E1, and three exchanges of three-phase commutation bridge are defeated
Enter end respectively with the A phases, B phases and C of three-phase alternating current power frequency supply to be connected, the output positive voltage terminal of three-phase commutation bridge simultaneously with filter
One end of ripple capacitance E1 is connected with the positive voltage input terminal of the power switch pipe full-bridge inverting unit (2), three-phase commutation bridge
It is defeated with the other end of filter capacitor E1 and the negative voltage of the power switch pipe full-bridge inverting unit (2) simultaneously to export negative voltage side
Enter end connection；
The power switch pipe full-bridge inverting unit (2) includes power switch pipe G1, power switch pipe G2, power switch pipe
The collector of G3 and power switch pipe G4, power switch pipe G1 and the collector of power switch pipe G3 simultaneously with the power switch
The positive voltage input terminal connection of pipe full-bridge inverting unit (2), the transmitting of the emitter and power switch pipe G4 of power switch pipe G2
Pole is connected simultaneously with negative voltage input terminal, the emitter of power switch pipe G1 simultaneously with the collector of power switch pipe G2 and described
The input terminal connection of inductance capacitance coupling unit (4), the emitter of power switch pipe G3 while the current collection with power switch pipe G4
Pole is connected with one end of the high frequency transformer (7) T4 first windings, the output terminal of the inductance capacitance coupling unit (4) and institute
State the other end connection of high frequency transformer (7) T4 first windings；
HF current transformer (3) T1 is arranged on the positive voltage output end of the three phase rectifier unit (1) and described
In connecting wire section between the collector of the power switch pipe G1 of power switch pipe full-bridge inverting unit (2), which wears
Enter the HF current transformer (3) T1；HF current transformer (3) T2 is arranged on the three phase rectifier unit (1)
Connection between the collector of positive voltage output end and the power switch pipe G3 of the power switch pipe full-bridge inverting unit (2) is led
In line section, which penetrates the HF current transformer (3) T2；HF current transformer (3) T3 is arranged on described
In connecting wire section between power switch pipe full-bridge inverting unit (2) and the high frequency transformer (7), which penetrates institute
State HF current transformer (3) T3；
The overcurrent short detection unit (6) includes fast recovery diode D11, fast recovery diode D12, two poles of fast recovery
Pipe D21, fast recovery diode D22, fast recovery diode D31, fast recovery diode D32, fast recovery diode D33, fast recovery
Diode D34 and fast recovery diode D35, resistance R11, resistance R12, resistance R13, resistance R21, resistance R22, resistance R23, electricity
Hinder R31, resistance R32 and resistance R33, voltage comparator U1A, voltage comparator U1B and voltage comparator U1C, light emitting diode
LA1, light emitting diode LA2 and light emitting diode LA3, the positive terminal of fast recovery diode D11 and the HF current transformer
(3) the A+ ends connection of T1, negative pole end is connected simultaneously with resistance R11 and resistance R12, the other end of resistance R11 and meanwhile with the height
Connect the A- ends of frequency current transformer (3) T1 and control power supply, the other end of resistance R12 simultaneously with fast recovery diode D12
Negative pole end, the in-phase input end of voltage comparator U1A be connected, the anti-phase input of voltage comparator U1A termination reference voltage
The output terminal of Vref, voltage comparator U1A are connected simultaneously with the positive terminal of fast recovery diode D12 and one end of resistance R13, electricity
The other end of resistance R13 is connected with the positive terminal of light emitting diode LA1, the cathode termination control power supply of light emitting diode LA1；Soon
The positive terminal of recovery diode D21 is connected with the A+ ends of the HF current transformer (3) T2, negative pole end simultaneously with resistance R21
It is connected with resistance R22, the other end of resistance R21 is simultaneously with the A- ends of the HF current transformer (3) T2 and with controlling power supply
Connection, the other end of the resistance R22 in-phase input end phase with the negative pole end of fast recovery diode D22, voltage comparator U1B simultaneously
Connection, the anti-phase input termination reference voltage Vref of voltage comparator U1B, the output terminal of voltage comparator U1B simultaneously with it is fast extensive
The positive terminal of multiple diode D22 is connected with one end of resistance R23, the other end of resistance R23 and the anode of light emitting diode LA2
End connection, the cathode termination control power supply of light emitting diode LA2；Fast recovery diode D32 and fast recovery diode D33 are just
With extremely connecing control power supply simultaneously, the negative pole end of fast recovery diode D32 while the positive terminal with fast recovery diode D34 and institute
State the A+ ends connection of HF current transformer (3) T3, the negative pole end of fast recovery diode D33 simultaneously with fast recovery diode D35
Positive terminal connected with the A- ends of the HF current transformer (3) T3, fast recovery diode D34 and fast recovery diode D35
Negative pole end be connected simultaneously with one end of resistance R31 and resistance R32, another termination of resistance R31 with controlling power supply, resistance R32
The other end simultaneously be connected with the negative pole end of fast recovery diode D31 and the in-phase input end of voltage comparator U1C, voltage compares
The anti-phase input termination reference voltage Vref of device U1C, the output terminal of voltage comparator U1C is simultaneously with fast recovery diode D31's
Positive terminal is connected with one end of resistance R33, and the other end of resistance R33 is connected with the positive terminal of light emitting diode LA3, and luminous two
The cathode termination control power supply of pole pipe LA3, the output of voltage comparator U1A, voltage comparator U1B and voltage comparator U1C
The signal at end is respectively outputted to the driving overcurrent short-circuit protection control unit (5), and the driving overcurrent short-circuit protection control is single
First (5) export four road drive signals, independently connect the power switch pipe of the power switch pipe full-bridge inverting unit (2)
G1, power switch pipe G2, the control pole of power switch pipe G3 and power switch pipe G4.
Foregoing full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, which is characterized in that the inductance electricity
Holding coupling unit (4) includes inductance L1 and capacitance C1, and one end of inductance L1 connects with the power switch pipe full-bridge inverting unit (2)
It connects, the other end is connected with one end of capacitance C1, the other end of capacitance C1 and one end of the high frequency transformer (4) T4 first windings
Connection.
Foregoing full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, which is characterized in that the high frequency is whole
Flowing output unit (8) includes fast recovery diode D41, fast recovery diode D42, resistance R41, resistance R42, capacitance C41 and electricity
Hold C42, one end of the secondary winding of high frequency transformer (4) T4 simultaneously with one end of capacitance C41 and fast recovery diode D41
Anode connection, the other end of the secondary winding of high frequency transformer (4) T4 simultaneously with one end of capacitance C42 and fast recovery two
The anode connection of pole pipe D42, the other end of capacitance C41 are connected with resistance R41, and the other end of capacitance C42 is connected with resistance R42
Connect, the other end of resistance R41, the cathode of fast recovery diode D41, the other end of resistance R42, fast recovery diode D42 it is negative
Pole is connected to the anode of external output voltage simultaneously, and the centre tap end of high frequency transformer (4) the T4 secondary windings is connected to
The cathode of external output voltage.
Foregoing full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, which is characterized in that the high-frequency electrical
Current transformer (3) includes closed hoop magnetic core (31) and the coil (32) being wrapped on magnetic core, the HF current transformer (3)
The conducting wire of on-position penetrates the HF current transformer (3).
Compared with prior art, the invention has the beneficial effects that：
(1) full-bridge inverting power switch pipe overcurrent of the invention and the principle of load over-current protection circuit type of alarm are bases
In current detecting, when wherein any one moment is induced more than normal electric current by HF current transformer T1, T2 and T3, lead to
Over-voltage comparator exports and latches high level, and high level signal notice driving overcurrent short-circuit protection control unit makes it close immediately
The drive signal of disconnected all power switch pipes；
(2) circuit structure is simple, and stability is good, saves system cost, has good practicability.
Description of the drawings
Fig. 1 is the full-bridge inverting power switch pipe overcurrent of the present invention and the circuit diagram of load over-current protection circuit；
Fig. 2 is the HF current transformer of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit in Fig. 1
The structure diagram of one specific embodiment；
Fig. 3 is the HF current transformer of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit in Fig. 2
The sectional view of one specific embodiment.
Wherein：
1- three phase rectifier unit 2- power switch pipe full-bridge inverting units
3- HF current transformer 31- closed hoop magnetic cores
32- coil 4- inductance capacitance coupling units
5- drives overcurrent short-circuit protection control unit 6- overcurrent short detection units
7- high frequency transformer 8- high-frequency rectification output units.
Specific embodiment
Make specific introduce to the present invention below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, full-bridge inverting power switch pipe overcurrent of the invention and load over-current protection circuit, including three phase rectifier
Unit 1, power switch pipe full-bridge inverting unit 2, three HF current transformers 3T1, T2 and T3, inductance capacitance coupling unit 4,
Overcurrent short-circuit protection control unit 5, overcurrent short detection unit 6, high frequency transformer 7, high-frequency rectification output unit 8 are driven,
Three phase rectifier unit 1 includes three-phase commutation bridge and filter capacitor E1, three ac input ends point of three-phase commutation bridge
It is not connected with the A phases, B phases and C of three-phase alternating current power frequency supply, the output positive voltage terminal of three-phase commutation bridge while and filter capacitor
One end of E1 is connected with the positive voltage input terminal of power switch pipe full-bridge inverting unit 2, the output negative voltage side of three-phase commutation bridge
It is connected simultaneously with the other end of filter capacitor E1 and the negative voltage input terminal of power switch pipe full-bridge inverting unit 2；
Power switch pipe full-bridge inverting unit 2 includes power switch pipe G1, power switch pipe G2, power switch pipe G3 and work(
The collector of rate switching tube G4, power switch pipe G1 and the collector of power switch pipe G3 simultaneously with power switch pipe full-bridge inverting
The positive voltage input terminal connection of unit 2, the emitter of power switch pipe G2 and the emitter of power switch pipe G4 while and negative electricity
Press input terminal connection, the emitter of power switch pipe G1 simultaneously with the collector of power switch pipe G2 and inductance capacitance coupling unit
4 input terminal connection, the emitter of power switch pipe G3 simultaneously with the collector of power switch pipe G4 and high frequency transformer 7T4 mono-
One end connection of secondary winding, the output terminal of inductance capacitance coupling unit 4 connect with the other end of high frequency transformer 7T4 first windings
It connects；
HF current transformer 3T1 be arranged on three phase rectifier unit 1 positive voltage output end and power switch pipe full-bridge it is inverse
Become in the connecting wire section between the collector of the power switch pipe G1 of unit 2, which penetrates HF current transformer
3T1；HF current transformer 3T2 is arranged on the positive voltage output end of three phase rectifier unit 1 and power switch pipe full-bridge inverting list
In connecting wire section between the collector of the power switch pipe G3 of member 2, which penetrates HF current transformer 3T2；It is high
Frequency current transformer 3T3 is arranged on the connecting wire section between power switch pipe full-bridge inverting unit 2 and high frequency transformer 7
Interior, which penetrates HF current transformer 3T3；
Overcurrent short detection unit 6 include fast recovery diode D11, fast recovery diode D12, fast recovery diode D21,
Fast recovery diode D22, fast recovery diode D31, fast recovery diode D32, fast recovery diode D33, fast recovery diode
D34 and fast recovery diode D35, resistance R11, resistance R12, resistance R13, resistance R21, resistance R22, resistance R23, resistance R31,
Resistance R32 and resistance R33, voltage comparator U1A, voltage comparator U1B and voltage comparator U1C, light emitting diode LA1, hair
The positive terminal of optical diode LA2 and light emitting diode LA3, fast recovery diode D11 connect with the A+ ends of HF current transformer 3T1
It connects, negative pole end is connected simultaneously with resistance R11 and resistance R12, and the other end of resistance R11 is simultaneously with HF current transformer 3T1's
A- ends are connected with control power supply, the other end of resistance R12 while negative pole end, voltage comparator with fast recovery diode D12
The in-phase input end of U1A is connected, the anti-phase input termination reference voltage Vref of voltage comparator U1A, voltage comparator U1A's
Output terminal is connected simultaneously with the positive terminal of fast recovery diode D12 and one end of resistance R13, and the other end of resistance R13 is with shining
The positive terminal connection of diode LA1, the cathode termination control power supply of light emitting diode LA1；The anode of fast recovery diode D21
End is connected with the A+ ends of HF current transformer 3T2, and negative pole end is connected simultaneously with resistance R21 and resistance R22, and resistance R21's is another
One end is connected simultaneously with the A- ends of HF current transformer 3T2 and control power supply, and the other end of resistance R22 recovers simultaneously with fast
Negative pole end, the in-phase input end of voltage comparator U1B of diode D22 is connected, the anti-phase input termination of voltage comparator U1B
Reference voltage Vref, the output terminal of voltage comparator U1B simultaneously with the positive terminal of fast recovery diode D22 and resistance R23 one
End is connected, and the other end of resistance R23 is connected with the positive terminal of light emitting diode LA2, the cathode termination control of light emitting diode LA2
Power supply processed；The positive terminal of fast recovery diode D32 and fast recovery diode D33 are with connecing control power supply simultaneously, fast to recover two poles
The negative pole end of pipe D32 is connected simultaneously with the positive terminal of fast recovery diode D34 and the A+ ends of HF current transformer 3T3, fast extensive
The negative pole end of multiple diode D33 connects simultaneously with the A- ends of the positive terminal of fast recovery diode D35 and HF current transformer 3T3
It connecing, the negative pole end of fast recovery diode D34 and fast recovery diode D35 are connected simultaneously with one end of resistance R31 and resistance R32,
Another termination control power supply of resistance R31, the other end of resistance R32 while negative pole end and electricity with fast recovery diode D31
The in-phase input end connection of comparator U1C, the anti-phase input termination reference voltage Vref of voltage comparator U1C are pressed, voltage compares
The output terminal of device U1C is connected simultaneously with the positive terminal of fast recovery diode D31 and one end of resistance R33, the other end of resistance R33
It is connected with the positive terminal of light emitting diode LA3, the cathode termination control power supply of light emitting diode LA3, voltage comparator
The signal of the output terminal of U1A, voltage comparator U1B and voltage comparator U1C is respectively outputted to the short-circuit protection control of driving overcurrent
Unit 5, driving overcurrent short-circuit protection control unit 5 export four road drive signals, and it is inverse independently to connect power switch pipe full-bridge
Become the control pole of the power switch pipe G1 of unit 2, power switch pipe G2, power switch pipe G3 and power switch pipe G4.
As a preferred solution, inductance capacitance coupling unit 4 include inductance L1 and capacitance C1, one end of inductance L1 with
Power switch pipe full-bridge inverting unit 2 connects, and the other end is connected with one end of capacitance C1, the other end and the high frequency transformation of capacitance C1
One end connection of device 4T4 first windings.
As a preferred solution, high-frequency rectification output unit 8 includes fast recovery diode D41, fast recovery diode
D42, resistance R41, resistance R42, capacitance C41 and capacitance C42, one end of the secondary winding of high frequency transformer 4T4 while and capacitance
One end of C41 is connected with the anode of fast recovery diode D41, the other end of the secondary winding of high frequency transformer 4T4 simultaneously with electricity
The one end for holding C42 is connected with the anode of fast recovery diode D42, and the other end of capacitance C41 is connected with resistance R41, capacitance C42's
The other end is connected with resistance R42, the other end of resistance R41, the cathode of fast recovery diode D41, resistance R42 the other end,
The cathode of fast recovery diode D42 is connected to the anode of external output voltage, the centre of high frequency transformer 4T4 secondary windings simultaneously
Tap terminals are connected to the cathode of external output voltage.
With reference to Fig. 2 and Fig. 3, as a preferred solution, HF current transformer 3 includes closed hoop magnetic core 31 and twines
The coil 32 being wound on magnetic core, the conducting wire of 3 on-position of HF current transformer penetrate HF current transformer 3.
Operation principle：
The full-bridge inverting power switch pipe overcurrent and load over-current protection circuit of the present invention during normal operation, drove
Flow short-circuit protection control unit 5 sends the continuous dutycycle square wave driving signal of four tunnel independences, independently connects work(
Rate switching tube G1, power switch pipe G2, the control pole of power switch pipe G3 and power switch pipe G4.In the upper of recurrent pulse square wave
During half cycle, power switch pipe G1 and power switch pipe G4 conductings, power switch pipe G2 and power switch pipe G3 end, at this moment in height
A+, A- both ends of frequency current transformer 3T1 generate high-frequency direct-current pulse signal, which passes through fast recovery diode D11 and electricity
R11 is hindered, pressure drop V is generated on resistance R11R11, which is connected to the homophase input of voltage comparator U1A by resistance R12
End, the high-frequency direct-current pulse signal at A+, A- both ends of HF current transformer 3T2 are 0；In the lower half of recurrent pulse square wave
When, power switch pipe G1 and power switch pipe G4 end, power switch pipe G2 and power switch pipe G3 conductings, at this moment in high-frequency electrical
A+, A- both ends of current transformer 3T2 generate high-frequency direct-current pulse signal, which passes through fast recovery diode D21 and resistance
R21 generates pressure drop V on resistance R21R21, which is connected to the in-phase input end of voltage comparator U1B by resistance R22,
High-frequency direct-current pulse signal at A+, A- both ends of HF current transformer 3T1 is 0；In the complete period of recurrent pulse square wave,
A+, A- both ends of HF current transformer 3T3 generate high-frequency ac pulse signal, which passes through fast recovery diode D32, fast
Recovery diode D33, fast recovery diode D34 and fast recovery diode D35 full-bridge rectifications become direct current signal and pass through resistance
R31 generates pressure drop VR on resistance R3131, which is connected to the in-phase input end of voltage comparator U1C by resistance R32.
During normal operation, the homophase input terminal voltage of voltage comparator U1A, voltage comparator U1B and voltage comparator U1C are low
In inverting input reference voltage Vref, the output terminal electricity of voltage comparator U1A, voltage comparator U1B and voltage comparator U1C
It is 0 to press signal, and light emitting diode LA1, LA2, LA3 be not shinny.
Overcurrent and the operation principle of load overcurrent protection：
The full-bridge inverting power switch pipe overcurrent and load over-current protection circuit of the present invention during normal operation, works as power
During one of them generation puncture short of switching tube G1 and power switch pipe G2, exported from the output positive voltage terminal of three-phase commutation bridge
Electric current by HF current transformer 3T1, the collector and emitter of power switch pipe G1, power switch pipe G2 collector and
Emitter returns to the output negative voltage side of three-phase commutation bridge, forms short-circuit loop circuit, high since short circuit current flow is very big
Also moment induces far more than normal electric current through resistance R11 frequency current transformer 3T1, the pressure drop generated on resistance R11
VR11, which is connected to the in-phase input end of voltage comparator U1A by resistance R12, at this time due to voltage comparator U1A's
Homophase input terminal voltage VR11Inverting input reference voltage Vref much larger than voltage comparator U1A, then voltage comparator U1A
Output end voltage signal from working normally when low level become high level, the high level signal be passed to drove flow short-circuit protect
Control unit 5 is protected, driving overcurrent short-circuit protection control unit 5 stops sending immediately the drive signal of all power switch pipes, makes
Power switch pipe G1, power switch pipe G2, power switch pipe G3 and power switch pipe G4 are stopped, to protect power switch pipe
G1, power switch pipe G2, power switch pipe G3 and G4 are no longer impacted by Short-Circuit High Current, while voltage comparator U1A's is defeated
The high level signal for going out terminal voltage feeds back to the in-phase input end of voltage comparator U1A by fast recovery diode D12, to voltage
The high level signal of comparator U1A output end voltages carries out latch holding, which passes through resistance R13 and light-emitting diodes
Pipe LA1 connects control power supply, and light emitting diode LA1 is maintained shinny at this time, so as to indicate to penetrate HF current transformer 3T1 this
Overcurrent or short circuit has occurred in circuit all the way.
Equally, during full-bridge inverting power switch pipe overcurrent and load over-current protection circuit work normally, when power is opened
When closing one of them generation puncture short of pipe G3 and power switch pipe G4, from the electricity of the output positive voltage terminal output of three-phase commutation bridge
Stream is by HF current transformer 3T2, the collector and emitter of power switch pipe G3, the collector and hair of power switch pipe G4
Emitter-base bandgap grading returns to the output negative voltage side of three-phase commutation bridge, forms short-circuit loop circuit, since short circuit current flow is very big, high frequency
Also moment induces far more than normal electric current through resistance R21 current transformer 3T2, the pressure drop generated on resistance R21
VR21, which is connected to the in-phase input end of voltage comparator U1B by resistance R22, at this time due to voltage comparator U1B's
Homophase input terminal voltage VR21Inverting input reference voltage Vref much larger than voltage comparator U1B, then voltage comparator U1B
Output end voltage signal from working normally when low level become high level, the high level signal be passed to drove flow short-circuit protect
Control unit 5 is protected, driving overcurrent short-circuit protection control unit 5 stops sending immediately the drive signal of all power switch pipes, makes
Power switch pipe G1, power switch pipe G2, power switch pipe G3 and power switch pipe G4 are stopped, to protect power switch pipe
G1, power switch pipe G2, power switch pipe G3 and power switch pipe G4 are no longer impacted by Short-Circuit High Current, while voltage compares
The high level signal of the output end voltage of device U1B feeds back to the homophase input of voltage comparator U1B by fast recovery diode D22
End, carries out latch holding, which passes through resistance R23 to the high level signal of voltage comparator U1B output end voltages
Control power supply is connect with light emitting diode LA2, light emitting diode LA2 is maintained shinny at this time, mutual to indicate to penetrate high frequency electric
Overcurrent or short circuit has occurred in circuit all the way for this of sensor 3T2.
Equally, during full-bridge inverting power switch pipe overcurrent and load over-current protection circuit work normally, when high frequency becomes
When overcurrent or short circuit occur for depressor T4 first windings or secondary winding, HF current transformer 3T3 also moment induce far more than
Normal alternating current, the alternating current pass through fast recovery diode D32, fast recovery diode D33, fast recovery diode D34
Become direct current signal with fast recovery diode D35 full-bridge rectifications, the pressure drop VR31 generated by resistance R31, the voltage passes through electricity
Resistance R32 is connected to the in-phase input end of voltage comparator U1C, at this time due to the homophase input terminal voltage of voltage comparator U1C
VR31 is much larger than the inverting input reference voltage Vref of voltage comparator U1C, then the output end voltage letter of voltage comparator U1C
Low level during number from working normally becomes high level, which is passed to driving overcurrent short-circuit protection control unit 5, drives
Dynamic overcurrent short-circuit protection control unit 5 stops sending immediately the drive signal of all power switch pipes, makes power switch pipe G1, work(
Rate switching tube G2, power switch pipe G3 and power switch pipe G4 are stopped, to protect power switch pipe G1, power switch pipe
G2, power switch pipe G3 and power switch pipe G4 are no longer impacted by Short-Circuit High Current, while the output terminal of voltage comparator U1C
The high level signal of voltage feeds back to the in-phase input end of voltage comparator U1C by fast recovery diode D31, and voltage is compared
The high level signal of device U1C output end voltages carries out latch holding, which passes through resistance R33 and light emitting diode
LA3 connects control power supply, and light emitting diode LA3 is maintained shinny at this time, so as to indicate to penetrate HF current transformer 3T3 this all the way
High frequency transformer T4 circuits overcurrent or short circuit has occurred.
In conclusion the high frequency switch power full-bridge inverting power switch pipe overcurrent and load over-current protection circuit of the present invention
Based on current work, when wherein any one moment is induced more than normal electric current by HF current transformer 3T1, T2, T3,
It is exported by voltage comparator and latches high level, high level signal notice driving overcurrent short-circuit protection control unit 5 makes it vertical
Turn off the drive signal of all power switch pipes in addition, the present invention circuit structure it is simple, stability is good, save system into
This, has good practicability.
It should be noted that the foregoing is merely presently preferred embodiments of the present invention, it is not intended to limit the invention, it is all at this
Within the spirit and principle of invention, any modifications, equivalent replacements and improvements are made should be included in the protection model of the present invention
Within enclosing.
Claims (4)
1. a kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit, which is characterized in that including three phase rectifier list
First (1), power switch pipe full-bridge inverting unit (2), three HF current transformer (3) T1, T2 and T3, inductance capacitance coupling lists
First (4), driving overcurrent short-circuit protection control unit (5), overcurrent short detection unit (6), high frequency transformer (7), high-frequency rectification
Output unit (8),
The three phase rectifier unit (1) includes three-phase commutation bridge and filter capacitor E1, three ac input ends of three-phase commutation bridge
It is connected respectively with the A phases, B phases and C of three-phase alternating current power frequency supply, the output positive voltage terminal of three-phase commutation bridge while and filtered electrical
The one end for holding E1 is connected with the positive voltage input terminal of the power switch pipe full-bridge inverting unit (2), the output of three-phase commutation bridge
Negative voltage side simultaneously with the other end of filter capacitor E1 and the negative voltage input terminal of the power switch pipe full-bridge inverting unit (2)
Connection；
The power switch pipe full-bridge inverting unit (2) include power switch pipe G1, power switch pipe G2, power switch pipe G3 and
The collector of power switch pipe G4, power switch pipe G1 and the collector of power switch pipe G3 are complete with the power switch pipe simultaneously
The positive voltage input terminal connection of bridge inversion unit (2), the emitter of power switch pipe G2 and the emitter of power switch pipe G4 are same
When be connected with negative voltage input terminal, the emitter of power switch pipe the G1 collector with power switch pipe G2 and the inductance simultaneously
The input terminal connection of capacitive coupling element (4), the emitter of power switch pipe G3 simultaneously with the collector of power switch pipe G4 and
One end connection of high frequency transformer (7) the T4 first windings, output terminal and the height of the inductance capacitance coupling unit (4)
The other end connection of frequency power transformer (7) T4 first windings；
HF current transformer (3) T1 is arranged on the positive voltage output end of the three phase rectifier unit (1) and the power
In connecting wire section between the collector of the power switch pipe G1 of switching tube full-bridge inverting unit (2), which penetrates height
Frequency current transformer (3) T1；The positive voltage that HF current transformer (3) T2 is arranged on the three phase rectifier unit (1) is defeated
Connecting wire section between the collector of the power switch pipe G3 of outlet and the power switch pipe full-bridge inverting unit (2)
Interior, which penetrates HF current transformer (3) T2；HF current transformer (3) T3 is arranged on the power switch pipe
In connecting wire section between full-bridge inverting unit (2) and the high frequency transformer (7), which penetrates high frequency electric mutual inductance
Device (3) T3；
The overcurrent short detection unit (6) includes fast recovery diode D11, fast recovery diode D12, fast recovery diode
D21, fast recovery diode D22, fast recovery diode D31, fast recovery diode D32, fast recovery diode D33, two are recovered soon
Pole pipe D34 and fast recovery diode D35, resistance R11, resistance R12, resistance R13, resistance R21, resistance R22, resistance R23, resistance
R31, resistance R32 and resistance R33, voltage comparator U1A, voltage comparator U1B and voltage comparator U1C, light emitting diode
LA1, light emitting diode LA2 and light emitting diode LA3, the positive terminal of fast recovery diode D11 and the HF current transformer
(3) the A+ ends connection of T1, negative pole end is connected simultaneously with resistance R11 and resistance R12, the other end of resistance R11 and meanwhile with the height
Connect the A- ends of frequency current transformer (3) T1 and control power supply, the other end of resistance R12 simultaneously with fast recovery diode D12
Negative pole end, the in-phase input end of voltage comparator U1A be connected, the anti-phase input of voltage comparator U1A termination reference voltage
The output terminal of Vref, voltage comparator U1A are connected simultaneously with the positive terminal of fast recovery diode D12 and one end of resistance R13, electricity
The other end of resistance R13 is connected with the positive terminal of light emitting diode LA1, the cathode termination control power supply of light emitting diode LA1；Soon
The positive terminal of recovery diode D21 is connected with the A+ ends of the HF current transformer (3) T2, negative pole end simultaneously with resistance R21
It is connected with resistance R22, the other end of resistance R21 is simultaneously with the A- ends of the HF current transformer (3) T2 and with controlling power supply
Connection, the other end of the resistance R22 in-phase input end phase with the negative pole end of fast recovery diode D22, voltage comparator U1B simultaneously
Connection, the anti-phase input termination reference voltage Vref of voltage comparator U1B, the output terminal of voltage comparator U1B simultaneously with it is fast extensive
The positive terminal of multiple diode D22 is connected with one end of resistance R23, the other end of resistance R23 and the anode of light emitting diode LA2
End connection, the cathode termination control power supply of light emitting diode LA2；Fast recovery diode D32 and fast recovery diode D33 are just
With extremely connecing control power supply simultaneously, the negative pole end of fast recovery diode D32 while the positive terminal with fast recovery diode D34 and institute
State the A+ ends connection of HF current transformer (3) T3, the negative pole end of fast recovery diode D33 simultaneously with fast recovery diode D35
Positive terminal connected with the A- ends of the HF current transformer (3) T3, fast recovery diode D34 and fast recovery diode D35
Negative pole end be connected simultaneously with one end of resistance R31 and resistance R32, another termination of resistance R31 with controlling power supply, resistance R32
The other end simultaneously be connected with the negative pole end of fast recovery diode D31 and the in-phase input end of voltage comparator U1C, voltage compares
The anti-phase input termination reference voltage Vref of device U1C, the output terminal of voltage comparator U1C is simultaneously with fast recovery diode D31's
Positive terminal is connected with one end of resistance R33, and the other end of resistance R33 is connected with the positive terminal of light emitting diode LA3, and luminous two
The cathode termination control power supply of pole pipe LA3, the output of voltage comparator U1A, voltage comparator U1B and voltage comparator U1C
The signal at end is respectively outputted to the driving overcurrent short-circuit protection control unit (5), and the driving overcurrent short-circuit protection control is single
First (5) export four road drive signals, independently connect the power switch pipe of the power switch pipe full-bridge inverting unit (2)
G1, power switch pipe G2, the control pole of power switch pipe G3 and power switch pipe G4.
2. full-bridge inverting power switch pipe overcurrent according to claim 1 and load over-current protection circuit, which is characterized in that
The inductance capacitance coupling unit (4) includes inductance L1 and capacitance C1, and one end of inductance L1 and the power switch pipe full-bridge are inverse
Become unit (2) to connect, the other end is connected with one end of capacitance C1, the other end of capacitance C1 and the high frequency transformer (4) T4 mono-
One end connection of secondary winding.
3. full-bridge inverting power switch pipe overcurrent according to claim 1 and load over-current protection circuit, which is characterized in that
The high-frequency rectification output unit (8) includes fast recovery diode D41, fast recovery diode D42, resistance R41, resistance R42, electricity
Hold C41 and capacitance C42, one end of the secondary winding of high frequency transformer (4) T4 is recovered simultaneously with one end of capacitance C41 and soon
The anode connection of diode D41, the other end of the secondary winding of high frequency transformer (4) T4 while one end with capacitance C42
It is connected with the anode of fast recovery diode D42, the other end of capacitance C41 is connected with resistance R41, the other end and the electricity of capacitance C42
Resistance R42 is connected, the other end of resistance R41, the cathode of fast recovery diode D41, the other end of resistance R42, two poles of fast recovery
The cathode of pipe D42 is connected to the anode of external output voltage, the centre tap of high frequency transformer (4) the T4 secondary windings simultaneously
End is connected to the cathode of external output voltage.
4. full-bridge inverting power switch pipe overcurrent according to claim 1 and load over-current protection circuit, which is characterized in that
The HF current transformer (3) includes closed hoop magnetic core (31) and the coil (32) being wrapped on magnetic core, the high-frequency electrical
The conducting wire of current transformer (3) on-position penetrates the HF current transformer (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810103329.9A CN108092237B (en) | 2018-02-01 | 2018-02-01 | Full-bridge inversion power switching tube overcurrent and load overcurrent protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810103329.9A CN108092237B (en) | 2018-02-01 | 2018-02-01 | Full-bridge inversion power switching tube overcurrent and load overcurrent protection circuit |
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| CN108092237B CN108092237B (en) | 2023-09-26 |
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| CN109471393A (en) * | 2018-11-22 | 2019-03-15 | 广州龙之杰科技有限公司 | A kind of device and method in security control magnetic field |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| CN110797836A (en) * | 2019-11-28 | 2020-02-14 | 北京Abb电气传动系统有限公司 | Circuit for switching power supply in motor driver, operation method and motor driving circuit system |
| CN113328416A (en) * | 2021-08-03 | 2021-08-31 | 武汉市聚芯微电子有限责任公司 | Full-bridge overcurrent protection circuit and full-bridge overcurrent protection method |
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| CN108092237B (en) | 2023-09-26 |
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