CN207884278U - A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit - Google Patents
A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit Download PDFInfo
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- CN207884278U CN207884278U CN201820178837.9U CN201820178837U CN207884278U CN 207884278 U CN207884278 U CN 207884278U CN 201820178837 U CN201820178837 U CN 201820178837U CN 207884278 U CN207884278 U CN 207884278U
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Abstract
The utility model discloses a kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuits, including three phase rectifier unit, power switch tube 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 tube overcurrent of the utility model and the principle of load over-current protection circuit type of alarm are to be based on current detecting; when wherein any one moment induces 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 set to immediately turn off the drive signal of all power switch tubes in addition; the circuit structure of the utility model 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 tube overcurrent and load over-current protection circuits, and in particular to Yi Zhonggao
Frequency Switching Power Supply full-bridge inverting power switch tube overcurrent and load over-current protection circuit, belong to power electronics field.
Background technology
It is largely complete using power switch tube especially 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 tubes in full bridge inverter will bear high voltage and high current
Critical component, thus to the detection of power switch tube and protection become key problem in technology.In the prior art to full bridge inverter
In the detections of four power switch tubes adopted the technical scheme that, when full bridge inverter works, work as power switch tube
When G1, G4 are connected, by voltage pressures of the dedicated optocoupler driving IC between the emitter and collector of power switch tube G1, G4
Drop Vce is sampled respectively, and when voltage drop is more than preset value, optocoupler driving IC sends out alarm；Equally, work as power switch tube
When G2, G3 are connected, by voltage pressures of the dedicated optocoupler driving IC between the emitter and collector of power switch tube G2, G3
Drop Vce is sampled respectively, and when voltage drop is more than preset value, optocoupler driving IC sends out alarm；It can be seen that this alarm
The principle of mode is to be based on voltage detecting.
In order to ensure the current foldback circuit of four power switch tubes in full bridge inverter stablizes effective, development one kind
Full-bridge inverting power switch tube overcurrent and load over-current protection circuit based on electric current are very important, and the invention also has
Important application prospect.
Invention content
The problem of present invention exists for the above-mentioned prior art makes improvements, and discloses a kind of full-bridge inverting power switch tube mistake
Stream and load over-current protection circuit.The mistake of four power switch tubes in full bridge inverter is detected and ensured based on current system
Stream protection circuit stability is effective.
In order to realize that above-mentioned target, the technical solution adopted in the present invention be：
A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit, which is characterized in that including three phase rectifier
Unit (1), power switch tube 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 to be respectively connected with the A phases of three-phase alternating current power frequency supply, B phases and C, the output positive voltage terminal of three-phase commutation bridge simultaneously with filter
One end of wave capacitance E1 is connected with the positive voltage input terminal of the power switch tube 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 tube full-bridge inverting unit (2) simultaneously to export negative voltage side
Enter end connection；
The power switch tube full-bridge inverting unit (2) includes power switch tube G1, power switch tube G2, power switch tube
The collector of G3 and power switch tube G4, power switch tube G1 and the collector of power switch tube G3 simultaneously with the power switch
The positive voltage input terminal of pipe full-bridge inverting unit (2) connects, the transmitting of the emitter and power switch tube G4 of power switch tube G2
Pole is connect with negative voltage input terminal simultaneously, the emitter of power switch tube G1 simultaneously with the collector of power switch tube G2 and described
The input terminal of inductance capacitance coupling unit (4) connects, the emitter of power switch tube G3 while the current collection with power switch tube G4
Pole is connected with one end of the high frequency transformer (7) T4 first windings, the output end 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 setting is in 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 tube G1 of power switch tube full-bridge inverting unit (2), which wears
Enter the HF current transformer (3) T1；HF current transformer (3) T2 is arranged in the three phase rectifier unit (1)
Positive voltage output end and the power switch tube full-bridge inverting unit (2) power switch tube G3 collector between company
It connects in conducting wire section, which penetrates the HF current transformer (3) T2；HF current transformer (3) the T3 settings exist
In connecting wire section between the power switch tube full-bridge inverting unit (2) and the high frequency transformer (7), which wears
Enter the 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) ends the A+ connection of T1, negative pole end connect with resistance R11 and resistance R12 simultaneously, the other end of resistance R11 and meanwhile with it is described
The ends A- of HF current transformer (3) T1 are connected with control power ground, the other end of resistance R12 while and fast recovery diode
The negative pole end of D12, the in-phase input end of voltage comparator U1A are connected, and the anti-phase input termination of voltage comparator U1A is with reference to electricity
Vref, the output end of voltage comparator U1A is pressed to be connect simultaneously with one end of the positive terminal of fast recovery diode D12 and resistance R13,
The other end of resistance R13 is connect with the positive terminal of light emitting diode LA1, the cathode termination control power ground of light emitting diode LA1；
The positive terminal of fast recovery diode D21 is connect with the ends A+ of the HF current transformer (3) T2, negative pole end while and resistance
R21 is connected with resistance R22, the other end of resistance R21 simultaneously with the ends A- of the HF current transformer (3) T2 and control power supply
Ground connects, the other end of resistance R22 simultaneously with the negative pole end of fast recovery diode D22, the in-phase input end of voltage comparator U1B
Be connected, the anti-phase input of voltage comparator U1B terminates reference voltage Vref, the output end of voltage comparator U1B simultaneously with it is fast
The positive terminal of recovery diode D22 is connected with one end of resistance R23, and the other end and light emitting diode LA2 of resistance R23 are just
Extreme connection, the cathode termination control power ground of light emitting diode LA2；Fast recovery diode D32 and fast recovery diode D33
Positive terminal connect control power ground simultaneously, the negative pole end of the fast recovery diode D32 positive terminal with fast recovery diode D34 simultaneously
It is connected with the ends A+ of the HF current transformer (3) T3, the negative pole end of fast recovery diode D33 while and fast recovery diode
The positive terminal of D35 is connected with the ends A- of the HF current transformer (3) T3, fast recovery diode D34 and fast recovery diode
The negative pole end of D35 is connect with one end of resistance R31 and resistance R32 simultaneously, and another termination of resistance R31 controls power ground, resistance
The other end of R32 is connect with the in-phase input end of the negative pole end of fast recovery diode D31 and voltage comparator U1C simultaneously, voltage
The anti-phase input of comparator U1C terminates reference voltage Vref, the output end of voltage comparator U1C while and fast recovery diode
The positive terminal of D31 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,
The cathode termination control power ground of light emitting diode LA3, voltage comparator U1A, voltage comparator U1B and voltage comparator U1C
The signal of output end be respectively outputted to the driving overcurrent short-circuit protection control unit (5), the driving overcurrent short-circuit protection
Control unit (5) exports four road drive signals, and the power for independently connecting the power switch tube full-bridge inverting unit (2) is opened
Close the control pole of pipe G1, power switch tube G2, power switch tube G3 and power switch tube G4.
Full-bridge inverting power switch tube overcurrent above-mentioned and load over-current protection circuit, which is characterized in that the inductance electricity
It includes inductance L1 and capacitance C1 to hold coupling unit (4), and one end of inductance L1 connects with the power switch tube full-bridge inverting unit (2)
It connects, the other end is connect with one end of capacitance C1, one end of the other end of capacitance C1 and the high frequency transformer (7) T4 first windings
Connection.
Full-bridge inverting power switch tube overcurrent above-mentioned and load over-current protection circuit, which is characterized in that the high frequency is whole
It includes fast recovery diode D41, fast recovery diode D42, resistance R41, resistance R42, capacitance C41 and electricity to flow output unit (8)
Hold C42, one end of the secondary winding of high frequency transformer (7) T4 while one end with capacitance C41 and fast recovery diode
The anode connection of D41, the other end of the secondary winding of high frequency transformer (7) T4 simultaneously with one end of capacitance C42 and extensive soon
The anode connection of multiple diode D42, the other end of capacitance C41 are connect with resistance R41, the other end and the resistance R42 phases of capacitance C42
Connection, the other end of resistance R41, the cathode of fast recovery diode D41, the other end of resistance R42, fast recovery diode D42
Cathode is connected to the anode of external output voltage, the centre tap end connection of high frequency transformer (7) the T4 secondary windings simultaneously
In the cathode of external output voltage.
Full-bridge inverting power switch tube overcurrent above-mentioned 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 tube 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 induces 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 for all power switch tubes of breaking；
(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 tube 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 tube overcurrent and load over-current protection circuit in Fig. 1
The structural schematic diagram of one specific embodiment；
Fig. 3 is the HF current transformer of full-bridge inverting power switch tube 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 tube 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 implementation mode
Specific introduce is made to the present invention below in conjunction with the drawings and specific embodiments.
Referring to Fig.1, full-bridge inverting power switch tube overcurrent of the invention and load over-current protection circuit, including three phase rectifier
Unit 1, power switch tube 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 of three-phase alternating current power frequency supply, B phases and C, 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 tube full-bridge inverting unit 2, the output negative voltage side of three-phase commutation bridge
It is connect simultaneously with the negative voltage input terminal of the other end of filter capacitor E1 and power switch tube full-bridge inverting unit 2；
Power switch tube full-bridge inverting unit 2 includes power switch tube G1, power switch tube G2, power switch tube G3 and work(
The collector of rate switching tube G4, power switch tube G1 and the collector of power switch tube G3 simultaneously with power switch tube full-bridge inverting
The positive voltage input terminal connection of unit 2, the emitter of power switch tube G2 and the emitter of power switch tube G4 while and negative electricity
Press input terminal connection, the emitter of power switch tube G1 while collector and inductance capacitance coupling unit with power switch tube G2
4 input terminal connection, the emitter of power switch tube G3 while collector and high frequency transformer 7T4 mono- with power switch tube G4
One end of secondary winding connects, and the output end of inductance capacitance coupling unit 4 connects with the other end of high frequency transformer 7T4 first windings
It connects；
It is inverse that positive voltage output end and power switch tube full-bridge in three phase rectifier unit 1 is arranged in HF current transformer 3T1
Become in the connecting wire section between the collector of the power switch tube G1 of unit 2, which penetrates HF current transformer
3T1；Positive voltage output end and power switch tube full-bridge inverting list in three phase rectifier unit 1 is arranged in HF current transformer 3T2
In connecting wire section between the collector of the power switch tube G3 of member 2, which penetrates HF current transformer 3T2；It is high
The connecting wire section between power switch tube full-bridge inverting unit 2 and high frequency transformer 7 is arranged in frequency current transformer 3T3
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, light emitting diode LA2 and light emitting diode LA3, positive terminal and the HF current transformer 3T1 of fast recovery diode D11
The connection of the ends A+, negative pole end connect with resistance R11 and resistance R12 simultaneously, the other end of resistance R11 and meanwhile with high-frequency current mutual inductance
The ends A- of device 3T1 are connected with control power ground, the other end of resistance R12 while negative pole end, voltage with fast recovery diode D12
The in-phase input end of comparator U1A is connected, and the anti-phase input of voltage comparator U1A terminates reference voltage Vref, and voltage compares
The output end of device U1A is connect with one end of the positive terminal of fast recovery diode D12 and resistance R13 simultaneously, and resistance R13's is another
End is connect with the positive terminal of light emitting diode LA1, the cathode termination control power ground of light emitting diode LA1；Fast recovery diode
The positive terminal of D21 is connect with the ends A+ of HF current transformer 3T2, and negative pole end is connect with resistance R21 and resistance R22 simultaneously, electricity
The other end for hindering R21 is connect with the ends A- of HF current transformer 3T2 and control power ground simultaneously, and the other end of resistance R22 is same
When be connected with the in-phase input end of the negative pole end of fast recovery diode D22, voltage comparator U1B, voltage comparator U1B's
Anti-phase input terminates reference voltage Vref, the output end of voltage comparator U1B while the positive terminal with fast recovery diode D22
It is connected with one end of resistance R23, the other end of resistance R23 is connect with the positive terminal of light emitting diode LA2, light emitting diode
The cathode termination control power ground of LA2；The positive terminal of fast recovery diode D32 and fast recovery diode D33 connect control electricity simultaneously
Source, the negative pole end of fast recovery diode D32 while positive terminal and HF current transformer 3T3 with fast recovery diode D34
The connection of the ends A+, the negative pole end of fast recovery diode D33 is mutual with the positive terminal and high-frequency current of fast recovery diode D35 simultaneously
The ends A- of sensor 3T3 connect, the negative pole end of fast recovery diode D34 and fast recovery diode D35 simultaneously with resistance R31 and resistance
One end of R32 connects, and another termination of resistance R31 controls power ground, the other end of resistance R32 while and fast recovery diode
The negative pole end of D31 is connected with the in-phase input end of voltage comparator U1C, and the anti-phase input termination of voltage comparator U1C is with reference to electricity
Vref, the output end of voltage comparator U1C is pressed to be connect simultaneously with one end of the positive terminal of fast recovery diode D31 and resistance R33,
The other end of resistance R33 is connected with the positive terminal of light emitting diode LA3, the cathode termination control power supply of light emitting diode LA3
Ground, voltage comparator U1A, voltage comparator U1B and voltage comparator U1C output end signal be respectively outputted to driving overcurrent
Short-circuit protection control unit 5, driving overcurrent short-circuit protection control unit 5 export four road drive signals, independently connect power
The control of the power switch tube G1, power switch tube G2, power switch tube G3 and power switch tube G4 of switching tube full-bridge inverting unit 2
Pole processed.
As a preferred solution, inductance capacitance coupling unit 4 include inductance L1 and capacitance C1, one end of inductance L1 with
Power switch tube full-bridge inverting unit 2 connects, and the other end is connect with one end of capacitance C1, the other end and the high frequency transformation of capacitance C1
One end of device 7T4 first windings connects.
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 7T4 while and capacitance
The anode connection of one end of C41 and fast recovery diode D41, the other end of the secondary winding of high frequency transformer 7T4 simultaneously with electricity
Hold one end of C42 and the anode connection of fast recovery diode D42, the other end of capacitance C41 is connect 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 simultaneously, in high frequency transformer 7T4 secondary windings
Between tap terminals be 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 conducting wire of the coil 32 being wound on magnetic core, 3 on-position of HF current transformer penetrates HF current transformer 3.
Operation principle：
The full-bridge inverting power switch tube overcurrent and load over-current protection circuit of the present invention during normal operation, drove
Flow short-circuit protection control unit 5 sends out the independent continuous dutycycle square wave driving signal in four tunnels, independently connects work(
The control pole of rate switching tube G1, power switch tube G2, power switch tube G3 and power switch tube G4.In the upper of recurrent pulse square wave
When half cycle, power switch tube G1 and power switch tube G4 conductings, power switch tube G2 and power switch tube G3 end, at this moment in height
The both ends A+, A- 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 the both ends A+, A- of HF current transformer 3T2 are 0；In the lower half of recurrent pulse square wave
When, power switch tube G1 and power switch tube G4 end, power switch tube G2 and power switch tube G3 conductings, at this moment in high-frequency electrical
The both ends A+, A- 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 the both ends A+, A- of HF current transformer 3T1 is 0；In the complete period of recurrent pulse square wave,
The both ends A+, A- 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 end 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 tube overcurrent and load over-current protection circuit of the present invention during normal operation, works as power
When one of them generation puncture short of switching tube G1 and power switch tube G2, exported from the output positive voltage terminal of three-phase commutation bridge
Electric current is by HF current transformer 3T1, the collector of the collector and emitter of power switch tube G1, power switch tube G2
And emitter, the output negative voltage side of three-phase commutation bridge is returned to, short-circuit loop circuit is formd, since short circuit current is very big,
Also moment induces far more than normal electric current through resistance R11 HF current transformer 3T1, the pressure generated on resistance R11
V dropsR11, which is connected to the in-phase input end of voltage comparator U1A by resistance R12, at this time due to voltage comparator U1A
Homophase input terminal voltage VR11Inverting input reference voltage Vref much larger than voltage comparator U1A, then voltage comparator
Low level when the output end voltage signal of U1A is from working normally becomes high level, and the incoming driving overcurrent of the high level signal is short
Control unit 5, driving overcurrent short-circuit protection control unit 5 is protected to stop sending the driving letter of all power switch tubes immediately in road
Number, so that power switch tube G1, power switch tube G2, power switch tube G3 and power switch tube G4 is stopped, to protect power
Switching tube G1, power switch tube G2, power switch tube G3 and G4 are no longer impacted by Short-Circuit High Current, while voltage comparator
The high level signal of the output end voltage of U1A feeds back to the homophase input of voltage comparator U1A by fast recovery diode D12
End, carries out latch holding, which passes through resistance R13 to the high level signal of voltage comparator U1A output end voltages
Control power ground is connect with light emitting diode LA1, light emitting diode LA1 is maintained shinny at this time, mutual to indicate to penetrate high-frequency current
Overcurrent or short circuit has occurred in circuit all the way for this of sensor 3T1.
Equally, during full-bridge inverting power switch tube 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 tube 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 hair of the collector and emitter of power switch tube G3, power switch tube 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 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 is incoming to drive flow short-circuit to protect
Control unit 5 is protected, driving overcurrent short-circuit protection control unit 5 stops sending immediately the drive signal of all power switch tubes, makes
Power switch tube G1, power switch tube G2, power switch tube G3 and power switch tube G4 are stopped, to protect power switch
Pipe G1, power switch tube G2, power switch tube G3 and power switch tube G4 are no longer impacted by Short-Circuit High Current, while voltage
The high level signal of the output end voltage of comparator U1B feeds back to the same phase of voltage comparator U1B by fast recovery diode D22
Input terminal carries out latch holding to the high level signal of voltage comparator U1B output end voltages, which passes through resistance
R23 and light emitting diode LA2 connect control power ground, and light emitting diode LA2 is maintained shinny at this time, to indicate to penetrate high-frequency current
Overcurrent or short circuit has occurred in circuit all the way for this of mutual inductor 3T2.
Equally, during full-bridge inverting power switch tube 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 of voltage comparator U1C
Low level when signal is from working normally becomes high level, the incoming driving overcurrent short-circuit protection control unit 5 of the high level signal,
Drive overcurrent short-circuit protection control unit 5 to stop sending the drive signal of all power switch tubes immediately, make power switch tube G1,
Power switch tube G2, power switch tube G3 and power switch tube G4 are stopped, to protect power switch tube G1, power switch tube
G2, power switch tube G3 and power switch tube G4 are no longer impacted by Short-Circuit High Current, while the output end 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, to voltage ratio
High level signal compared with device U1C output end voltages carries out latch holding, which passes through resistance R33 and light emitting diode
LA3 connects control power ground, at this time light emitting diode LA3 maintain it is shinny, 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 tube overcurrent and load over-current protection circuit of the present invention
Based on current work, when wherein any one moment induces more than normal electric current by HF current transformer 3T1, T2, T3,
High level is exported and latched by voltage comparator, and high level signal notice driving overcurrent short-circuit protection control unit 5 keeps it vertical
Turn off the drive signal of all power switch tubes in addition, the present invention circuit structure it is simple, stability is good, save system at
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 modification, equivalent replacement, improvement and so on should be included in the protection model of the present invention
Within enclosing.
Claims (4)
1. a kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit, which is characterized in that including three phase rectifier list
First (1), power switch tube 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 of three-phase alternating current power frequency supply, B phases and C, 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 tube full-bridge inverting unit (2), the output of three-phase commutation bridge
Negative voltage side negative voltage input terminal with the other end and the power switch tube full-bridge inverting unit (2) of filter capacitor E1 simultaneously
Connection；
The power switch tube full-bridge inverting unit (2) include power switch tube G1, power switch tube G2, power switch tube G3 and
The collector of power switch tube G4, power switch tube G1 and the collector of power switch tube G3 are complete with the power switch tube simultaneously
The positive voltage input terminal of bridge inversion unit (2) connects, and the emitter of power switch tube G2 and the emitter of power switch tube G4 are same
When connect with negative voltage input terminal, the emitter of power switch tube the G1 collector with power switch tube G2 and the inductance simultaneously
The input terminal of capacitive coupling element (4) connects, the emitter of power switch tube G3 simultaneously with the collector of power switch tube G4 and
One end of high frequency transformer (7) the T4 first windings connects, output end and the height of the inductance capacitance coupling unit (4)
The other end of frequency power transformer (7) T4 first windings connects；
Positive voltage output end and the power in the three phase rectifier unit (1) is arranged in HF current transformer (3) T1
In connecting wire section between the collector of the power switch tube G1 of switching tube full-bridge inverting unit (2), which penetrates height
Frequency current transformer (3) T1；HF current transformer (3) the T2 settings are defeated in the positive voltage of the three phase rectifier unit (1)
Connecting wire section between the collector of the power switch tube G3 of outlet and the power switch tube full-bridge inverting unit (2)
Interior, which penetrates HF current transformer (3) T2；HF current transformer (3) T3 is arranged in the power switch tube
In connecting wire section between full-bridge inverting unit (2) and the high frequency transformer (7), which penetrates high-frequency current 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, restore two 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) ends the A+ connection of T1, negative pole end connect with resistance R11 and resistance R12 simultaneously, the other end of resistance R11 and meanwhile with the height
The ends A- of frequency current transformer (3) T1 connects with control power ground, the other end of resistance R12 and meanwhile with fast recovery diode D12
Negative pole end, voltage comparator U1A in-phase input end be connected, the anti-phase input of voltage comparator U1A terminates reference voltage
The output end of Vref, voltage comparator U1A are connect with one end of the positive terminal of fast recovery diode D12 and resistance R13 simultaneously, electricity
The other end of resistance R13 is connect with the positive terminal of light emitting diode LA1, the cathode termination control power ground of light emitting diode LA1；Soon
The positive terminal of recovery diode D21 is connect with the ends A+ of the HF current transformer (3) T2, negative pole end simultaneously with resistance R21
Connected with resistance R22, the other end of resistance R21 simultaneously with the ends A- of the HF current transformer (3) T2 and control power ground
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 of voltage comparator U1B terminate reference voltage Vref, the output end 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 anode of the other end and light emitting diode LA2 of resistance R23
End connection, the cathode termination control power ground of light emitting diode LA2；Fast recovery diode D32 and fast recovery diode D33 are just
It is extreme to meet control power ground, the negative pole end of fast recovery diode D32 while the positive terminal with fast recovery diode D34 and institute simultaneously
State the ends the A+ 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 ends A- of the HF current transformer (3) T3, fast recovery diode D34 and fast recovery diode D35
Negative pole end connect simultaneously with one end of resistance R31 and resistance R32, another termination of resistance R31 control power ground, resistance R32
The other end simultaneously connect with the in-phase input end of the negative pole end of fast recovery diode D31 and voltage comparator U1C, voltage compares
The anti-phase input of device U1C terminates reference voltage Vref, and the output end 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 ground 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 tube of the power switch tube full-bridge inverting unit (2)
The control pole of G1, power switch tube G2, power switch tube G3 and power switch tube G4.
2. full-bridge inverting power switch tube 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 tube full-bridge are inverse
Become unit (2) to connect, the other end is connect with one end of capacitance C1, the other end of capacitance C1 and the high frequency transformer (7) T4 mono-
One end of secondary winding connects.
3. full-bridge inverting power switch tube 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 (7) T4 is restored with one end of capacitance C41 and soon simultaneously
The anode connection of diode D41, the other end of the secondary winding of high frequency transformer (7) T4 while one end with capacitance C42
With the anode connection of fast recovery diode D42, the other end of capacitance C41 is connect 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 (7) the T4 secondary windings simultaneously
End is connected to the cathode of external output voltage.
4. full-bridge inverting power switch tube 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820178837.9U CN207884278U (en) | 2018-02-01 | 2018-02-01 | A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820178837.9U CN207884278U (en) | 2018-02-01 | 2018-02-01 | A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207884278U true CN207884278U (en) | 2018-09-18 |
Family
ID=63510673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820178837.9U Withdrawn - After Issue CN207884278U (en) | 2018-02-01 | 2018-02-01 | A kind of full-bridge inverting power switch tube overcurrent and load over-current protection circuit |
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| CN (1) | CN207884278U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092237A (en) * | 2018-02-01 | 2018-05-29 | 佛山市南海毅顺电器设备有限公司 | A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit |
-
2018
- 2018-02-01 CN CN201820178837.9U patent/CN207884278U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092237A (en) * | 2018-02-01 | 2018-05-29 | 佛山市南海毅顺电器设备有限公司 | A kind of full-bridge inverting power switch pipe overcurrent and load over-current protection circuit |
| CN108092237B (en) * | 2018-02-01 | 2023-09-26 | 佛山市南海毅顺电器设备有限公司 | Full-bridge inversion power switching tube overcurrent and load overcurrent protection circuit |
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