CN205693327U - A kind of half-bridge surge detection protection circuit and electromagnetic heating apparatus - Google Patents
A kind of half-bridge surge detection protection circuit and electromagnetic heating apparatus Download PDFInfo
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- CN205693327U CN205693327U CN201620324895.9U CN201620324895U CN205693327U CN 205693327 U CN205693327 U CN 205693327U CN 201620324895 U CN201620324895 U CN 201620324895U CN 205693327 U CN205693327 U CN 205693327U
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Abstract
The utility model discloses a kind of half-bridge surge detection protection circuit and electromagnetic heating apparatus, described half-bridge surge detection protection circuit includes micro-control unit MCU, the first IGBT drive circuit, the second IGBT drive circuit, half-bridge resonance circuit, surge protection circuit and clamp circuit.This utility model uses surge protection circuit; when half-bridge resonance circuit generation surge; control clamp circuit by surge protection circuit and drag down IGBT upper and lower bridge arm drive circuit; close half-bridge resonance circuit; make half-bridge resonance circuit quit work, half-bridge resonance circuit is protected, and use MCU interruption mode; in the way of hardware protection and software protection combine, there is the fireballing advantage of protection.
Description
Technical field
This utility model relates to surge detection resist technology field, be specifically related to a kind of half-bridge surge detection protection circuit and
Electromagnetic heating apparatus.
Background technology
Current half-bridge Electromagnetic Heating scheme surge detection is all based on software, protects electricity by the way of software interrupt
Road.The triggering level when curtage surge occurs, then MCU detects interruption, enters interrupt call surge protection program.
This mode occurs to protection at surge needs the regular hour, and protection speed is slow.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of half-bridge surge detection protection circuit and Electromagnetic Heating
Equipment, the mode using soft or hard to combine carries out surge detection protection, has the fireballing advantage of protection.
The technical scheme that this utility model solves above-mentioned technical problem is as follows:
This utility model provides a kind of half-bridge surge detection protection circuit, drives including micro-control unit MCU, an IGBT
Galvanic electricity road, the second IGBT drive circuit, half-bridge resonance circuit, surge protection circuit and clamp circuit；
Described MCU connects with the input of the first IGBT drive circuit and the input of the second IGBT drive circuit respectively
Connect, the outfan of described first IGBT drive circuit and the outfan of the second IGBT drive circuit all defeated with half-bridge resonance circuit
Entering end to connect, half-bridge resonance circuit, surge protection circuit and clamp circuit are sequentially connected electrically, the outfan of described clamp circuit
Connect input and the input of the second IGBT drive circuit of the first IGBT drive circuit respectively.
The beneficial effects of the utility model are: use surge protection circuit, when half-bridge resonance circuit generation surge, pass through
Surge protection circuit and clamp circuit drag down IGBT upper and lower bridge arm drive circuit, close half-bridge resonance circuit, and use MCU interruption
Mode, in the way of hardware protection and software protection combine, has the fireballing advantage of protection.
On the basis of technique scheme, this utility model can also improve as follows.
Further, described half-bridge resonance circuit is symmetrical half bridge resonance circuit or asymmetrical half-bridge resonance circuit；
Described symmetrical half bridge resonance circuit includes bridge IGBT1, lower bridge IGBT2, the first resonant capacitance C1, the second resonance electricity
Holding C2 and coil, the grid of described upper bridge IGBT1 and the outfan of the first IGBT drive circuit connect, described upper bridge IGBT1
Colelctor electrode be connected with the input of surge protection circuit, the colelctor electrode of the emitter stage of described upper bridge IGBT1 and lower bridge IGBT2 is even
Connect, and described upper bridge IGBT1 is connected with the common port of lower bridge IGBT2 and the middle line end of the first IGBT drive circuit, described lower bridge
The outfan of the grid of IGBT2 and the second IGBT drive circuit connects, the middle wire end ground of described second IGBT drive circuit with
And the grounded emitter of described lower bridge IGBT2, described first resonant capacitance C1 and the second resonant capacitance C2 is serially connected in described upper bridge
Between colelctor electrode and the emitter stage of lower bridge IGBT2 of IGBT1, described coil is connected to described first resonant capacitance C1 and second humorous
Shake between common port and the common port of upper bridge IGBT1 and lower bridge IGBT2 of electric capacity C2；
Described asymmetrical half-bridge resonance circuit includes bridge IGBT1, lower bridge IGBT2, the first resonant capacitance C1 and coil,
The grid of described upper bridge IGBT1 and the outfan of the first IGBT drive circuit connect, the colelctor electrode of described upper bridge IGBT1 and surge
The input of protection circuit connects, and the emitter stage of described upper bridge IGBT1 is connected with the colelctor electrode of lower bridge IGBT2, and described upper bridge
IGBT1 is connected with the common port of lower bridge IGBT2 and the middle line end of the first IGBT drive circuit, the grid of described lower bridge IGBT2 with
The outfan of the second IGBT drive circuit connects, the middle line end of described second IGBT drive circuit and described lower bridge IGBT2's
Grounded emitter, described first resonant capacitance C1 is serially connected in colelctor electrode and the emitter stage of lower bridge IGBT2 of described upper bridge IGBT1
Between, described coil be connected to described first resonant capacitance C1 connect lower bridge IGBT2 emitter stage one end and upper bridge IGBT1 and
Between the common port of lower bridge IGBT2.
Further, described surge protection circuit is voltage surge protection circuit, and described voltage surge protection circuit includes
Voltage surge detection circuit and voltage surge comparison circuit, the colelctor electrode of described upper bridge IGBT1 and the public affairs of the first resonant capacitance C1
End is connected with the In end of voltage surge detection circuit altogether, the out end of described voltage surge detection circuit and the transmitting of lower bridge IGBT2
Pole connects, and the output end of described voltage surge detection circuit is connected with the In end of voltage surge comparison circuit, described voltage wave
The input of the out end and described clamp circuit that gush comparison circuit is connected.
Further, described surge protection circuit is current surge protection circuit, and described current surge protection circuit includes
Current surge testing circuit and current surge comparison circuit, the colelctor electrode of described upper bridge IGBT1 and the public affairs of the first resonant capacitance C1
End is connected with the In end of current surge testing circuit altogether, the out end of described current surge testing circuit and the transmitting of lower bridge IGBT2
Pole connects, and the output end of described current surge testing circuit is connected with the In end of current surge comparison circuit, described electric current wave
The input of the out end and described clamp circuit that gush comparison circuit is connected.
Further, it is provided with between described surge protection circuit and described clamp circuit and door U1, described surge protection
Circuit includes voltage surge protection circuit and current surge protection circuit, and described voltage surge protection circuit includes that voltage surge is examined
Slowdown monitoring circuit and voltage surge comparison circuit, described current surge protection circuit includes current surge testing circuit and current surge ratio
Relatively circuit, the colelctor electrode of described upper bridge IGBT1 and the common port of the first resonant capacitance C1 and the In end of voltage surge detection circuit
Connecting, the output end of described voltage surge detection circuit electrically connects with the In end of voltage surge comparison circuit, described voltage wave
The out end gushing comparison circuit electrically connects with an input with door U1, and the out end of described voltage surge detection circuit is with described
The In end electrical connection of current surge testing circuit, the output end of described current surge testing circuit and current surge comparison circuit
In end electrical connection, the out end ground connection of described current surge testing circuit, the out end of described current surge comparison circuit with
Another input electrical connection of door U1, described and the outfan of door U1 with described clamp circuit input electrically connects.
Further, also include that a resistance R0, one end of described resistance R0 are electrically connected with the outfan and MCU with door U1U1
Connect, another termination VCC of described resistance R0.
Further, described voltage surge comparison circuit includes voltage comparator UA and resistance R1；
The positive input of described voltage comparator UA is connected with voltage surge threshold voltage source, described voltage comparator UA
Negative input electrically connect with the output end of described voltage surge detection circuit, power supply termination of voltage comparator UA
Another power end ground connection of VCC, voltage comparator UA；The one termination VCC of resistance R1, another termination voltage comparator UA's is defeated
Going out end, the outfan of voltage comparator UA also electrically connects with an input with door U1.
Further, described current surge comparison circuit includes voltage comparator UB and resistance R2；
The positive input of described voltage comparator UB is connected with described current surge threshold voltage source, and described voltage ratio is relatively
The negative input of device UB electrically connects with the output end of described current surge testing circuit, a power supply of voltage comparator UB
Another power end ground connection of termination VCC, voltage comparator UB；The one termination VCC of resistance R2, another terminates voltage comparator UB
Outfan, the outfan of described voltage comparator UB also electrically connects with another input with door U1.
Further, described clamp circuit includes the first diode D1 and the second diode D2, described first diode D1
Negative pole be connected with the negative pole of described second diode D2, the positive pole of described first diode D1 and the first IGBT drive circuit
Input electrically connects, the positive pole of described second diode D2 and the input electrical connection of the second IGBT drive circuit, and described first
The common port of diode D1 and the second diode D2 electrically connects with the outfan with door U1.
Further, also including bridge heap, two AC ends of described bridge heap connect power supply, the V+ end of described bridge heap and upper bridge respectively
The colelctor electrode of IGBT1 connects, and the V-end of described bridge heap is connected with the out end of voltage surge detection circuit.
Further, also including bridge heap, two AC ends of described bridge heap connect power supply, the V+ end of described bridge heap and upper bridge respectively
The colelctor electrode of IGBT1 connects, and the V-end of described bridge heap is connected with the In end of current surge testing circuit.
Further, also including bridge heap, two AC ends of described bridge heap connect power supply, the V+ end of described bridge heap and upper bridge respectively
The colelctor electrode of IGBT1 connects, the V-end of described bridge heap and the out end of voltage surge detection circuit and current surge testing circuit
In end electrical connection.
This utility model additionally provides a kind of electromagnetic heating apparatus, including a kind of half-bridge surge detection protection circuit.
Accompanying drawing explanation
Fig. 1 is a kind of half-bridge surge detection protection circuit connection diagram of this utility model embodiment 1；
Fig. 2 is that in embodiment 1, half-bridge resonance circuit is the circuit connection diagram of symmetrical half bridge resonance circuit；
Fig. 3 is that in embodiment, half-bridge resonance circuit is the circuit connection diagram of asymmetrical half-bridge resonance circuit；
Fig. 4 is physical circuit and the physical circuit of current surge comparison circuit in Fig. 2 with voltage surge comparison circuit
Connection diagram；
Fig. 5 is the fundamental diagram of half-bridge surge detection protection circuit.
In accompanying drawing, the label of each parts is as follows:
1, half-bridge resonance circuit, 2, surge protection circuit, 21, voltage surge detection circuit, 22, voltage surge more electric
Road, 23, current surge testing circuit, 24, current surge comparison circuit, 3, Qiao Dui.
Detailed description of the invention
Being described principle of the present utility model and feature below in conjunction with accompanying drawing, example is served only for explaining this practicality
Novel, it is not intended to limit scope of the present utility model.
Embodiment 1, a kind of half-bridge surge detection protection circuit.
Seeing Fig. 1, the half-bridge surge detection protection circuit that the present embodiment provides includes micro-control unit MCU, an IGBT
Drive circuit, the second IGBT drive circuit, half-bridge resonance circuit 1, surge protection circuit 2 and clamp circuit；Described MCU unit
Being connected with the input of the first IGBT drive circuit and the input of the second IGBT drive circuit respectively, a described IGBT drives
The outfan on galvanic electricity road and the outfan of the second IGBT drive circuit all inputs with half-bridge resonance circuit 1 are connected, and half-bridge is humorous
Shake circuit 1, surge protection circuit 2 and clamp circuit is sequentially connected electrically, and the outfan of described clamp circuit connects first respectively
The input of IGBT drive circuit and the input of the second IGBT drive circuit.
Wherein, described half-bridge resonance circuit 1 is symmetrical half bridge resonance circuit or asymmetrical half-bridge resonance circuit；See Fig. 2,
Described symmetrical half bridge resonance circuit include bridge IGBT1, lower bridge IGBT2, the first resonant capacitance C1, the second resonant capacitance C2 and
Coil, the grid of described upper bridge IGBT1 and the outfan of the first IGBT drive circuit connect, and described upper bridge IGBT1 and Xia Qiao
The common port of IGBT2 and the middle line end of the first IGBT drive circuit connect, the colelctor electrode of described upper bridge IGBT1 and surge detection electricity
The input on road connects, and the emitter stage of described upper bridge IGBT1 is connected with the colelctor electrode of lower bridge IGBT2, the grid of described lower bridge IGBT2
Pole is connected with the outfan of the second IGBT drive circuit, the middle line end of the second IGBT drive circuit and described lower bridge IGBT2's
Grounded emitter, the first resonant capacitance C1 and the second resonant capacitance C2 are serially connected in colelctor electrode and the Xia Qiao of described upper bridge IGBT1
Between the emitter stage of IGBT2, described coil be connected to the common port of described first resonant capacitance C1 and the second resonant capacitance C2 with
Between the common port of upper bridge IGBT1 and lower bridge IGBT2.See Fig. 3, described asymmetrical half-bridge resonance circuit include bridge IGBT1,
Lower bridge IGBT2, the first resonant capacitance C1 and coil, the grid of described upper bridge IGBT1 and the output of the first IGBT drive circuit
End connects, and described upper bridge IGBT1 is connected with the common port of lower bridge IGBT2 and the middle line end of the first IGBT drive circuit, described
The colelctor electrode of upper bridge IGBT1 is connected with the input of surge testing circuit, the emitter stage of described upper bridge IGBT1 and lower bridge IGBT2
Colelctor electrode connect, the grid of described lower bridge IGBT2 connects with the outfan of the second IGBT drive circuit, and the 2nd IGBT drives electric
The middle line end on road and the grounded emitter of described lower bridge IGBT2, the first resonant capacitance C1 is serially connected in described upper bridge IGBT1's
Between the emitter stage of colelctor electrode and lower bridge IGBT2, described coil is connected to described first resonant capacitance C1 and connects lower bridge IGBT2's
Between one end and the common port of upper bridge IGBT1 and lower bridge IGBT2 of emitter stage.
Described surge protection circuit 2 includes three kinds of situations, and the first situation is that surge protection circuit 2 is protected for voltage surge
Protection circuit, the second situation be surge protection circuit 2 be current surge protection circuit, the third situation is surge protection circuit 2
Including voltage surge protection circuit and current surge protection circuit.
When surge protection circuit 2 is voltage surge protection circuit, described voltage surge protection circuit includes voltage surge
Testing circuit 21 and voltage surge comparison circuit 22, the colelctor electrode of described upper bridge IGBT1 and the common port of the first resonant capacitance C1
It is connected with the In end of voltage surge detection circuit 21, the out end of described voltage surge detection circuit 21 and the transmitting of lower bridge IGBT2
Pole connects, and the output end of described voltage surge detection circuit 21 is connected with the In end of voltage surge comparison circuit 22, described electricity
The out end of pressure surge comparison circuit 22 electrically connects with the input of clamp circuit.When surge protection circuit 2 is protected for current surge
During circuit, described current surge protection circuit includes current surge testing circuit 23 and current surge comparison circuit 24, described on
Colelctor electrode and the common port of the first resonant capacitance C1 of bridge IGBT1 are connected with the In end of current surge testing circuit 23, described electricity
The emitter stage of out end and lower bridge IGBT2 that testing circuit 23 is gushed in wandering is connected, the output of described current surge testing circuit 23
End is connected with the In end of current surge comparison circuit 24, and the out end of described current surge comparison circuit 24 is defeated with clamp circuit
Enter end to electrically connect when surge protection circuit 2 includes voltage surge protection circuit and current surge protection circuit, at described surge
Being provided with between protection circuit and described clamp circuit and door U1, described voltage surge protection circuit includes voltage surge detection electricity
Road 21 and voltage surge comparison circuit 22, described current surge protection circuit includes current surge testing circuit 23 and current surge
Comparison circuit 24, the colelctor electrode of described upper bridge IGBT1 and the common port of the first resonant capacitance C1 and voltage surge detection circuit 21
In end connect, the output end of described voltage surge detection circuit 21 electrically connects with the In end of voltage surge comparison circuit 22,
The out end of described voltage surge comparison circuit 22 electrically connects with an input with door U1, described voltage surge detection circuit
The out end of 21 electrically connects with the In end of described current surge testing circuit 23, the output of described current surge testing circuit 23
End electrically connects with the In end of current surge comparison circuit 24, the out end ground connection of described current surge testing circuit 23, described electric current
The out end of surge comparison circuit 24 electrically connects with another input with door U1, the described and outfan of door U1 and described pincers
The input electrical connection of position circuit.
The present embodiment also includes that a resistance R0, one end of described resistance R0 are electrically connected with the outfan and MCU with door U1U1
Connect, another termination VCC of described resistance R0.
See Fig. 4, above-mentioned in voltage surge comparison circuit 22 include voltage comparator UA and resistance R1；Described voltage
The positive input of comparator UA is connected with voltage surge threshold voltage source, the negative input of described voltage comparator UA and institute
State the output end electrical connection of voltage surge detection circuit 21, a power supply termination VCC of voltage comparator UA, voltage comparator
Another power end ground connection of UA；The one termination VCC of resistance R1, the outfan of another termination voltage comparator UA, voltage ratio is relatively
The outfan of device UA also electrically connects with an input with door U1.
Same, above-mentioned in current surge comparison circuit 24 include voltage comparator UB and resistance R2；Described voltage
The positive input of comparator UB is connected with described current surge threshold voltage source, the negative input of described voltage comparator UB
Electrically connect with the output end of described current surge testing circuit 23, a power supply termination VCC of voltage comparator UB, voltage ratio
Another power end ground connection of relatively device UB；The one termination VCC of resistance R2, the outfan of another termination voltage comparator UB, described
The outfan of voltage comparator UB also electrically connects with another input with door U1.
Above-mentioned clamp circuit includes the first diode D1 and the second diode D2, the negative pole of described first diode D1 with
The negative pole of described second diode D2 is connected, the positive pole of described first diode D1 and the input electricity of the first IGBT drive circuit
Connect, the positive pole of described second diode D2 and the input electrical connection of the second IGBT drive circuit, described first diode D1
Electrically connect with the outfan with door U1 with the common port of the second diode D2.
The half-bridge surge detection protection circuit that the present embodiment provides also includes bridge heap 3, when surge protection circuit 2 is voltage wave
When gushing protection circuit, two AC ends of described bridge heap 3 connect the current collection of power supply, the V+ end of described bridge heap 3 and upper bridge IGBT1 respectively
Pole connects, and the V-end of described bridge heap 3 is connected with the out end of voltage surge detection circuit 21.When surge protection circuit 2 is electric current wave
When gushing protection circuit, two AC ends of described bridge heap 3 connect the colelctor electrode of power supply, the V+ end of described bridge heap 3 and upper bridge IGBT1 respectively
Connecting, the V-end of described bridge heap 3 is connected with the In end of current surge testing circuit 23.When surge protection circuit 2 includes electricity simultaneously
When pressure surge protection circuit and current surge protection circuit, two AC ends of described bridge heap 3 meet power supply, the V of described bridge heap 3 respectively
+ end is connected with the colelctor electrode of upper bridge IGBT1, the V-end of described bridge heap 3 and the out end of voltage surge detection circuit 21 and electric current
The In end electrical connection of surge testing circuit 23.
The half-bridge surge using the present embodiment to provide detects the operation principle of protection circuit: micro-control unit MCU exports
PWM1 and PWM2 controls the first IGBT drive circuit and the work of the second IGBT drive circuit respectively, may refer to Fig. 5, with for the moment
Between, the signal level state contrast of PWM1 and PWM2 of MCU output, i.e. when the PWM1 of MCU output is high level state,
The PWM2 of output is low level, or, when the PWM1 of MCU output is low level state, the PWM2 of output is high level state.
First IGBT drive circuit and the second IGBT drive circuit drive the work of half-bridge resonance circuit, when half-bridge resonance normal circuit operation
Time, voltage comparator UA and voltage comparator UB exports high level；When voltage surge occurs, voltage surge detection circuit defeated
Go out the voltage voltage surge threshold voltage more than voltage comparator UA, voltage comparator UA output low level, also export with door U1
Low level；When current surge occurs, the output voltage of the current surge testing circuit voltage surge more than voltage comparator UB
Threshold voltage, voltage comparator UB output low level, with door U1 also output low level；If voltage surge and electric current occur simultaneously
Surge, voltage comparator UA and current comparator UB all output low levels, also can output low level with door U1.Defeated when with door U1
When outlet is for low level, the first diode D1 and the second diode D2 is both turned on, PWM1 and PWM2 can be clamped as low electricity always
Flat, upper bridge IGBT1 and lower bridge IGBT2 can quit work, and serves the effect that hardware is quickly protected.Meanwhile, micro-control unit MCU
External interrupt mouth INT0 can produce corresponding external interrupt, calls surge protection program, by software protection circuit, thus reaches
The mode that hardware protection and software protection combine carries out the protection of circuit, has the fireballing advantage of protection.
Embodiment 2, a kind of electromagnetic heating apparatus.
The electromagnetic heating apparatus that the present embodiment provides includes the half-bridge surge detection protection circuit of embodiment 1, concrete reality
Existing principle can be found in embodiment 1, does not repeats them here.
A kind of half-bridge surge that this utility model provides detects protection circuit and electromagnetic heating apparatus, uses surge protection electricity
Road, when half-bridge resonance circuit generation surge, by dragging down IGBT upper and lower bridge arm drive circuit with door and clamp circuit, closes half
Bridge resonance circuit, and use MCU interruption mode, in the way of hardware protection and software protection combine, there is protection speed fast
Advantage；Single voltage surge protection circuit or current surge protection circuit can be set in whole circuit, it is possible to set simultaneously
Put voltage surge protection circuit and current surge protection circuit, it is adaptable to multiple situation；Design bridge heap in circuit, by input
Ac voltage rectifier is DC voltage, is suitable for each several part circuit and uses；It addition, design a parallel resistance for MCU, play shunting
Effect, and then play the effect of protection MCU.
In the description of this specification, reference term " embodiment one ", " example ", " concrete example " or " some examples "
Deng description means to combine this embodiment or example describes concrete grammar, device or feature be contained in of the present utility model extremely
In a few embodiment or example.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical
Embodiment or example.And, the specific features of description, method, device or feature can with one or more embodiments in office or
Example combines in an appropriate manner.Additionally, in the case of the most conflicting, those skilled in the art can be by this explanation
Different embodiments or the feature of example and different embodiment or example described in book are combined and combine.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in guarantor of the present utility model
Within the scope of protecting.
Claims (13)
1. half-bridge surge detection protection circuit, it is characterised in that include micro-control unit MCU, the first IGBT drive circuit,
Second IGBT drive circuit, half-bridge resonance circuit (1), surge protection circuit (2) and clamp circuit；
Described MCU is connected with the input of the first IGBT drive circuit and the input of the second IGBT drive circuit respectively, institute
State the outfan of the outfan of the first IGBT drive circuit and the second IGBT drive circuit all with the input of half-bridge resonance circuit (1)
End connects, and half-bridge resonance circuit (1), surge protection circuit (2) and clamp circuit be sequentially connected electrically, described clamp circuit defeated
Go out end and connect input and the input of the second IGBT drive circuit of the first IGBT drive circuit respectively.
2. half-bridge surge detection protection circuit as claimed in claim 1, it is characterised in that described half-bridge resonance circuit (1) is
Symmetrical half bridge resonance circuit or asymmetrical half-bridge resonance circuit；
Described symmetrical half bridge resonance circuit includes bridge IGBT1, lower bridge IGBT2, the first resonant capacitance C1, the second resonant capacitance C2
And coil, the grid of described upper bridge IGBT1 and the outfan of the first IGBT drive circuit connect, the collection of described upper bridge IGBT1
Electrode is connected with the input of surge protection circuit (2), and the emitter stage of described upper bridge IGBT1 connects with the colelctor electrode of lower bridge IGBT2
Connect, and the middle line end of described upper bridge IGBT1 and the common port of lower bridge IGBT2 and the first IGBT drive circuit connects, described lower bridge
The grid of IGBT2 and the outfan of the second IGBT drive circuit connect, the middle line end of described second IGBT drive circuit and institute
Stating the equal ground connection of emitter stage of lower bridge IGBT2, described first resonant capacitance C1 and the second resonant capacitance C2 is serially connected in described upper bridge
Between colelctor electrode and the emitter stage of lower bridge IGBT2 of IGBT1, described coil is connected to described first resonant capacitance C1 and second humorous
Shake between common port and the common port of upper bridge IGBT1 and lower bridge IGBT2 of electric capacity C2；
Described asymmetrical half-bridge resonance circuit includes bridge IGBT1, lower bridge IGBT2, the first resonant capacitance C1 and coil, described
The grid of upper bridge IGBT1 and the outfan of the first IGBT drive circuit connect, the colelctor electrode of described upper bridge IGBT1 and surge protection
The input of circuit (2) connects, and the emitter stage of described upper bridge IGBT1 is connected with the colelctor electrode of lower bridge IGBT2, and described upper bridge
IGBT1 is connected with the common port of lower bridge IGBT2 and the middle line end of the first IGBT drive circuit, the grid of described lower bridge IGBT2 with
The outfan of the second IGBT drive circuit connects, the middle line end of described second IGBT drive circuit and described lower bridge IGBT2's
Grounded emitter, described first resonant capacitance C1 be serially connected in the colelctor electrode of described upper bridge IGBT1 and lower bridge IGBT2 emitter stage it
Between, described coil be connected to described first resonant capacitance C1 connect lower bridge IGBT2 emitter stage one end and upper bridge IGBT1 and under
Between the common port of bridge IGBT2.
3. half-bridge surge detection protection circuit as claimed in claim 2, it is characterised in that described surge protection circuit (2) is
Voltage surge protection circuit, described voltage surge protection circuit includes that voltage surge detection circuit (21) and voltage surge are more electric
Road (22), the colelctor electrode of described upper bridge IGBT1 and the common port of the first resonant capacitance C1 and voltage surge detection circuit (21)
In end connects, and the out end of described voltage surge detection circuit (21) is connected with the emitter stage of lower bridge IGBT2, described voltage surge
The output end of testing circuit (21) is connected with the In end of voltage surge comparison circuit (22), described voltage surge comparison circuit
(22) out end is connected with the input of described clamp circuit.
4. half-bridge surge detection protection circuit as claimed in claim 2, it is characterised in that described surge protection circuit (2) is
Current surge protection circuit, described current surge protection circuit includes that current surge testing circuit (23) and current surge are more electric
Road (24), the colelctor electrode of described upper bridge IGBT1 and the common port of the first resonant capacitance C1 and current surge testing circuit (23)
In end connects, and the out end of described current surge testing circuit (23) is connected with the emitter stage of lower bridge IGBT2, described current surge
The output end of testing circuit (23) is connected with the In end of current surge comparison circuit (24), described current surge comparison circuit
(24) out end is connected with the input of described clamp circuit.
5. half-bridge surge detection protection circuit as claimed in claim 2, it is characterised in that described surge protection circuit (2) and
Being provided with between described clamp circuit and door U1, described surge protection circuit (2) includes voltage surge protection circuit and electric current wave
Gushing protection circuit, described voltage surge protection circuit includes voltage surge detection circuit (21) and voltage surge comparison circuit
(22), described current surge protection circuit includes current surge testing circuit (23) and current surge comparison circuit (24), described
The colelctor electrode of upper bridge IGBT1 and the common port of the first resonant capacitance C1 are connected with the In end of voltage surge detection circuit (21), institute
The In end of the output end and voltage surge comparison circuit (22) of stating voltage surge detection circuit (21) electrically connects, described voltage wave
The out end gushing comparison circuit (22) electrically connects with an input with door U1, the out of described voltage surge detection circuit (21)
End electrically connect with the In end of described current surge testing circuit (23), the output end of described current surge testing circuit (23) and
The In end electrical connection of current surge comparison circuit (24), the out end ground connection of described current surge testing circuit (23), described electric current
The out end of surge comparison circuit (24) electrically connects with another input with door U1, described with the outfan of door U1 with described
The input electrical connection of clamp circuit.
6. the half-bridge surge detection protection circuit as described in any one of claim 1-5, it is characterised in that also include resistance R0,
One end of described resistance R0 electrically connects with the outfan and MCU with door U1, another termination VCC of described resistance R0.
7. the half-bridge surge detection protection circuit as described in claim 3 or 5, it is characterised in that described voltage surge is more electric
Road (22) includes voltage comparator UA and resistance R1；
The positive input of described voltage comparator UA is connected with voltage surge threshold voltage source, and described voltage comparator UA's is negative
Output end to input with described voltage surge detection circuit (21) electrically connects, a power supply termination of voltage comparator UA
Another power end ground connection of VCC, voltage comparator UA；The one termination VCC of resistance R1, another termination voltage comparator UA's is defeated
Going out end, the outfan of voltage comparator UA also electrically connects with an input with door U1.
8. the half-bridge surge detection protection circuit as described in claim 4 or 5, it is characterised in that described current surge is more electric
Road (24) includes voltage comparator UB and resistance R2；
The positive input of described voltage comparator UB is connected with described current surge threshold voltage source, described voltage comparator UB
Negative input electrically connect with the output end of described current surge testing circuit (23), a power supply of voltage comparator UB
Another power end ground connection of termination VCC, voltage comparator UB；The one termination VCC of resistance R2, another terminates voltage comparator UB
Outfan, the outfan of described voltage comparator UB also electrically connects with another input with door U1.
9. half-bridge surge detection protection circuit as claimed in claim 1, it is characterised in that described clamp circuit includes the one or two
Pole pipe D1 and the second diode D2, the negative pole of described first diode D1 is connected with the negative pole of described second diode D2, described
The input electrical connection of the positive pole of the first diode D1 and the first IGBT drive circuit, the positive pole of described second diode D2 and the
The input electrical connection of two IGBT drive circuit, the common port of described first diode D1 and the second diode D2 and with door U1's
Outfan electrically connects.
10. half-bridge surge detection protection circuit as claimed in claim 3, it is characterised in that also include bridge heap (3), described bridge
Two AC ends of heap (3) connect power supply respectively, and the V+ end of described bridge heap (3) is connected with the colelctor electrode of upper bridge IGBT1, described bridge heap
(3) V-end is connected with the out end of voltage surge detection circuit (21).
11. half-bridge surge as claimed in claim 4 detection protection circuits, it is characterised in that also include bridge heap (3), described bridge
Two AC ends of heap (3) connect power supply respectively, and the V+ end of described bridge heap (3) is connected with the colelctor electrode of upper bridge IGBT1, described bridge heap
(3) V-end is connected with the In end of current surge testing circuit (23).
12. half-bridge surge as claimed in claim 5 detection protection circuits, it is characterised in that also include bridge heap (3), described bridge
Two AC ends of heap (3) connect power supply respectively, and the V+ end of described bridge heap (3) is connected with the colelctor electrode of upper bridge IGBT1, described bridge heap
(3) V-end electrically connects with the out end of voltage surge detection circuit (21) and the In end of current surge testing circuit (23).
13. 1 kinds of electromagnetic heating apparatus, it is characterised in that include that the half-bridge surge detection described in any one of claim 1-12 is protected
Protection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620324895.9U CN205693327U (en) | 2016-04-18 | 2016-04-18 | A kind of half-bridge surge detection protection circuit and electromagnetic heating apparatus |
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| CN201620324895.9U CN205693327U (en) | 2016-04-18 | 2016-04-18 | A kind of half-bridge surge detection protection circuit and electromagnetic heating apparatus |
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| CN205693327U true CN205693327U (en) | 2016-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108123707A (en) * | 2016-11-29 | 2018-06-05 | 丰田自动车株式会社 | On-off circuit |
-
2016
- 2016-04-18 CN CN201620324895.9U patent/CN205693327U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108123707A (en) * | 2016-11-29 | 2018-06-05 | 丰田自动车株式会社 | On-off circuit |
| CN108123707B (en) * | 2016-11-29 | 2021-09-14 | 丰田自动车株式会社 | Switching circuit |
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Granted publication date: 20161116 Termination date: 20210418 |