CN206605143U - A kind of CUT arc maintenance electronics current-limiting resistance circuit - Google Patents
A kind of CUT arc maintenance electronics current-limiting resistance circuit Download PDFInfo
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- CN206605143U CN206605143U CN201720260402.4U CN201720260402U CN206605143U CN 206605143 U CN206605143 U CN 206605143U CN 201720260402 U CN201720260402 U CN 201720260402U CN 206605143 U CN206605143 U CN 206605143U
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Abstract
The utility model discloses a kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit, filtering output circuit, in addition to auxiliary power circuit, frequency configuration circuit, current-limiting circuit, FET Q1, integrated chip U2, the first current sampling circuit, the first filter circuit, freewheeling circuit.The utility model can substitute relay of the prior art and inefficient current-limiting resistance well, so that the circuit after replacing is more reliable and more stable, reduce the loss in circuit running, and lift the operating efficiency of arc maintenance, and the utility model is simple in construction, firm, component cost is low, is easy to safeguard and overhauls.
Description
Technical field
The utility model is related to Power Electronic Technique circuit topological structure and welding, cutting power supply, more particularly to one kind etc.
Ion cutting machine arc maintenance electronics current-limiting resistance circuit.
Background technology
Plasma Are Cutting Machine is a kind of machinery being processed by plasma cutting technique to metal material.Plasma
Arc-maintaining device in cutting machine, can guarantee that the energy expenditure for the low CUT of decline that worked in non-cutting, reduces electrode and burns
Damage, extend the service life of CUT.During arc maintenance, the arc-maintaining device of CUT can be adjusted by
The size of the stingy flow of two magnetic valves, makes during arc maintenance that more continuous, noise is small, better reliability.But, due to arc maintenance function
It is connected in parallel to typically by power resistor and relay switch that a high-power fixed resistance value is connect in power positive end on nozzle
Realize, so in arc maintenance, there is very big voltage, electric current on power resistor, cause power resistor heating serious, easily because of mistake
Heat and damage.Therefore, in order to reduce the operating temperature of power resistor to improve its reliability, it is necessary to increase the power of power resistor
Grade simultaneously designs stronger radiating and cooling system, but this way adds the cost of arc maintenance again.Secondly, power resistor during arc maintenance
Resistance immobilize, power attenuation also immobilizes, and causes the operating efficiency of arc maintenance to only reach 50 percent, causes money
The serious waste in source.
The content of the invention
The utility model is ruined for arc maintenance cost height present in prior art, inefficiency, power resistor easily overheat
There is provided a kind of new CUT arc maintenance electronics current-limiting resistance circuit for the defects such as damage.
In order to solve the above-mentioned technical problem, the utility model is achieved through the following technical solutions：
A kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit, filtering output circuit, institute
The two ends for the current rectifying and wave filtering circuit stated are connected with OUT+ ends, OUT- ends respectively, the two ends of described filtering output circuit respectively with
QDH ends, the connection of OUT- ends, in addition to auxiliary power circuit, frequency configuration circuit, current-limiting circuit, FET Q1, integrated chip
U2, the first current sampling circuit, the first filter circuit, freewheeling circuit, described FET Q1 include three tunnels, described collection
OUT terminal into chip U2 is connected by current-limiting circuit with the FET Q1 first via, and described current rectifying and wave filtering circuit is imitated with field
Should pipe Q1 the connection of the second tunnel, described integrated chip U2 SEN ends are by the first filter circuit all the way with integrated chip U2's
3rd tunnel is connected, and another road is connected by the first current sampling circuit, freewheeling circuit and QDH ends, described frequency configuration circuit
It is connected respectively with integrated chip U2 RT/CT ends, GND ends, VREF ends, described auxiliary power circuit is with integrated chip U2's
VCC ends are connected.
OUT+ ends and OUT- ends are connected respectively to the output cathode of CUT and negative pole, QDH ends, OUT- ends
For the positive pole and negative pole of arc maintenance electronics current-limiting resistance circuit output.The voltage of input can be carried out rectification filter by current rectifying and wave filtering circuit
As the dc bus power supply of arc maintenance electronics current-limiting resistance circuit after ripple, auxiliary power circuit can provide electricity for integrated chip U2
Source so that integrated chip U2 energization work, integrated chip U2 is a kind of fixed frequency current mode controller, frequency configuration circuit
Fixed frequency for configuring integrated chip U2, integrated chip U2 OUT terminal is control signal output, its electric current exported warp
Crossing after current-limiting circuit current limliting is used to control turning on and off for FET Q1.When FET Q1 is opened, input voltage warp
QDH ends, the first electricity are output to after over commutation filter circuit after FET Q1, the first current sampling circuit, freewheeling circuit
Integrated chip U2 SEN ends are sent to after filtering after stream sample circuit is sampled to electric current and by the first current sampling circuit,
After electric current exceedes the threshold values at integrated chip U2 SEN ends, integrated chip U2 OUT terminal closes output current so that field
Effect pipe Q1 turn off, and freewheeling circuit can scene effect pipe Q1 be turned off after to output carry out afterflow, it is ensured that the stabilization of output
Property.By above structure, stability during arc maintenance can either be ensured, power attenuation during arc maintenance can be reduced again, arc maintenance is lifted
Operating efficiency, and extra radiating and cooling system need not be equipped with, reduce production cost.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, the rectifying and wave-filtering
Circuit includes power diode D3, electric capacity C1, electric capacity C9, electric capacity C10, electric capacity C6, described electric capacity C1, electric capacity C9, electric capacity
C10, electric capacity C6 constitute one end after parallel circuit and are connected with power diode D3 output end, and the other end is connected with OUT- ends, institute
The power diode D3 stated input is connected with OUT+ ends, power diode D3 output end also with FET Q1 second
Road is connected.
The current rectifying and wave filtering circuit being made up of above element can play more preferable filter action, circuit is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described filtering is defeated
Going out circuit includes resistance R19, R20, R21, electric capacity C7, and described resistance R19, resistance R20, resistance R21 are constituted after series circuit
In parallel with electric capacity C7, described electric capacity C7 one end is connected with QDH ends, and the other end is connected with OUT- ends.
The filtering output circuit being made up of above element can play more preferable filter action so that the electric current of output is more
Steadily, circuit is made more to stablize.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described auxiliary electricity
Source circuit includes auxiliary power supply end YH1, diode D1, electric capacity C3, electric capacity C4, and described diode D1 input is supplied with auxiliary
Electric end YH1 positive pole connection, diode D1 output end is connected with integrated chip U2 VCC ends, described electric capacity C3, electric capacity C4
Constitute one end after parallel circuit to be connected with integrated chip U2 VCC ends, the other end is connected with GNDB ends.
Wherein auxiliary power supply end YH1 is used for the voltage for providing auxiliary, and is carried out by diode D1, electric capacity C3, electric capacity C4
Integrated chip U2 VCC ends are input to after rectifying and wave-filtering so that the boost voltage of offer is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described frequency is matched somebody with somebody
Circuits include electric capacity C2, resistance R3, electric capacity C8, and described electric capacity C2 one end is connected with GNDB ends, the other end and integrated chip
U2 VREF ends connection, described resistance R3 one end is connected with integrated chip U2 VREF ends, and the other end is with integrated chip U2's
RT/CT ends are connected, and described electric capacity C8 one end is connected with integrated chip U2 RT/CT ends, the GND of the other end and integrated chip U2
End connection.
Wherein resistance R3, electric capacity C8 are used for the working frequency for setting integrated chip U2, and electric capacity C2 is to integrated chip U2's
VREF is filtered so that U2 working frequency is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described current limliting electricity
Road includes resistance R8, and the described FET Q1 first via is connected by resistance R8 with integrated chip U2 OUT terminal.
Resistance R8 can make the electric current in circuit be unlikely to excessive, and then the preferably stability of protection circuit.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, the first described electricity
Flowing sample circuit includes one end and field-effect after resistance R9, resistance R11, described resistance R9 and resistance R11 composition parallel circuits
Pipe Q1 the 3rd tunnel connection, the other end is connected with freewheeling circuit.
There can be certain cushioning effect to electric current by above structure, it is ensured that curent change is small within a certain period of time, i.e.,
Ensureing sampling, constantly electric current is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, the first described filter
Wave circuit includes resistance R4, electric capacity C5, and described resistance R4 one end is connected with integrated chip U2 SEN ends, the other end with it is described
FET Q1 the connection of the 3rd tunnel, described electric capacity C5 one end is connected with integrated chip U2 SEN ends, the other end and GNDB ends
Connection.
More preferable filter action can be played by above structure, circuit is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described afterflow electricity
Road includes power inductance L1, power diode D2, and the input of the power diode D2 is connected with OUT- ends, power diode
D2 output end is connected by power inductance L1 with QDH ends.
Power inductance L1 can produce induced electromotive force, when the current vanishes, its induced electricity when by electric current at its two ends
Kinetic potential can in circuit element produce backward voltage, because power diode D2 is connected in parallel on power inductance L1 two ends, then when
When flowing through power inductance L1 current vanishes, the induced electromotive force that power inductance L1 is produced passes through power diode D2 and power electricity
The loop that sense L1 is constituted is done work and consumed, so as to ensure other elements in the normal operation of afterflow, and protection circuit
Safety.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, in addition to the second electricity
Sample circuit is flowed, the second described current sampling circuit includes resistance R12, resistance R13, described resistance R12 and resistance R13 structures
One end is connected with power inductance L1 after into parallel circuit, and the other end is connected with power diode D2 output end.
Preferably electric current is sampled by the way that above structure is more enough.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, in addition to the first RC
Absorbing circuit, the first described RC absorbing circuits include resistance R17, electric capacity C11, described resistance R17 and described electric capacity C11
It is in parallel with described power diode D2 after series connection.
First RC absorbing circuits are capable of the peak voltage at absorbed power diode D2 two ends, it is to avoid circuit voltage climbing mistake
Greatly, it is ensured that the safety of circuit.Wherein electric capacity C11 series resistances R17 can play damping action, and it can prevent circuit in transition
During, power diode D2 is damaged in the overvoltage that capacitor two ends occur because vibrating, while capacitor can be avoided to lead to
Overpower diode D2 discharge currents are excessive, cause overcurrent and damage power diode D2.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, in addition to slope are mended
Repay circuit, described slope equalizer include triode Q3, resistance R5, resistance R10, the colelctor electrode c of the triode Q3 with
Described integrated chip U2 VREF ends connection, the base stage b of the triode Q3 and integrated chip U2 RT/CT ends connect
Connect, the emitter e of the triode Q3 is connected by the tunnels of resistance R5 mono- with the first filter circuit, another road by resistance R10 with
FET Q1 the 3rd tunnel connection.
The current perturbation that slope equalizer effectively avoids circuit produced by circular flow, it is to avoid feedback is shaken
Swing, circuit is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, in addition to the 2nd RC
Absorbing circuit, the 2nd described RC absorbing circuits include resistance R14, electric capacity C15, and described resistance R14 and electric capacity C15, which is constituted, to go here and there
One end is connected with FET Q1 the second tunnel after connection circuit, and the other end is connected with FET Q1 the 3rd tunnel.
2nd RC absorbing circuits can absorb the peak voltage of FET Q1 generations, it is to avoid circuit voltage climbing mistake
Greatly, it is ensured that the safety of circuit.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, in addition to closed loop electricity
Backfeed loop is flowed, described closed loop current backfeed loop includes integrated chip U1, electric capacity C12, electric capacity C13, resistance R2, resistance
R15, resistance R16, adjustable resistance RT1, described integrated chip U1 in-phase input end are connected with FET Q1 the 3rd tunnel,
Integrated chip U1 inverting input is connected by resistance R16 with GNDB ends, integrated chip U1 output end by resistance R15 with
Integrated chip U2 VFB ends connection, one end and integrated chip U1's is anti-phase after described electric capacity C12 is in parallel with adjustable resistance RT1
Input is connected, and the other end is connected with integrated chip U1 output end, and described electric capacity C13 and described resistance R2 are in parallel latter
End is connected with integrated chip U2 COMP ends, and the other end is connected with integrated chip U2 VFB ends.
Closed loop current backfeed loop can stablize the electric current between output QDH ends, OUT- ends, be unlikely to by input OUT+
End, the voltage at OUT- ends two ends export the change of load between QDH ends, OUT- ends and changed, and make arc maintenance more stable.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, in addition to the second filter
Wave circuit, described the second filter circuit includes resistance R6, resistance R7, electric capacity C14, described resistance R6 one end and field-effect
Pipe Q1 the 3rd tunnel connection, the other end is connected with integrated chip U1 in-phase input end, described resistance R7 one end with it is integrated
Chip U1 in-phase input end connection, the other end is connected with freewheeling circuit, described electric capacity C14 one end and the integrated chip
U1 in-phase input end connection, the other end is connected with GNDB ends.
It is more enough to play more preferable filter action, circuit is more stablized.
The utility model has the advantages that：
1st, the utility model can substitute relay of the prior art and inefficient current-limiting resistance well so that replace
Circuit afterwards is more reliable and more stable, the loss in reduction circuit running, and lifts the operating efficiency of arc maintenance.
2nd, the utility model is simple in construction, firm, and component cost is low, is easy to safeguard and overhauls.
Brief description of the drawings
Fig. 1 is a kind of electrical block diagram of CUT arc maintenance electronics current-limiting resistance circuit of the utility model.
Embodiment
Below in conjunction with the accompanying drawings 1 and embodiment the utility model is described in further detail, but they are not pair
Limitation of the present utility model：
Embodiment 1
As shown in figure 1, a kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit 1, filtering
Output circuit 9, the two ends of described current rectifying and wave filtering circuit 1 are connected with OUT+ ends, OUT- ends respectively, described filtering output circuit
9 two ends are connected with QDH ends, OUT- ends respectively, in addition to auxiliary power circuit 2, frequency configuration circuit 14, current-limiting circuit 3, field
Effect pipe Q1, integrated chip U2, the first current sampling circuit 6, the first filter circuit 4, freewheeling circuit 8, described FET
Q1 includes three tunnels, and described integrated chip U2 OUT terminal is connected by current-limiting circuit 3 with the FET Q1 first via, institute
The current rectifying and wave filtering circuit 1 stated is connected with FET Q1 the second tunnel, and described integrated chip U2 SEN ends pass through the first filtering
The tunnel of circuit 4 one is connected with integrated chip U2 the 3rd tunnel, and another road passes through the first current sampling circuit 6, freewheeling circuit 8 and QDH
End connection, described frequency configuration circuit 14 is connected with integrated chip U2 RT/CT ends, GND ends, VREF ends respectively, described
Auxiliary power circuit 2 is connected with integrated chip U2 VCC ends.
Preferably, the current rectifying and wave filtering circuit 1 includes power diode D3, electric capacity C1, electric capacity C9, electric capacity C10, electric capacity
C6, described electric capacity C1, electric capacity C9, electric capacity C10, electric capacity C6 constitute the output end of one end and power diode D3 after parallel circuit
Connection, the other end is connected with OUT- ends, and described power diode D3 input is connected with OUT+ ends, power diode D3's
Output end is also connected with FET Q1 the second tunnel.
Preferably, described filtering output circuit 9 includes resistance R19, R20, R21, electric capacity C7, described resistance R19,
In parallel with electric capacity C7 after resistance R20, resistance R21 composition series circuit, described electric capacity C7 one end is connected with QDH ends, the other end
It is connected with OUT- ends.
Preferably, described auxiliary power circuit 2 includes auxiliary power supply end YH1, diode D1, electric capacity C3, electric capacity C4,
Described diode D1 input is connected with auxiliary power supply end YH1 positive pole, diode D1 output end and integrated chip U2
The connection of VCC ends, described electric capacity C3, electric capacity C4 constitutes one end after parallel circuit and is connected with integrated chip U2 VCC ends, another
End is connected with GNDB ends.
Preferably, described frequency configuration circuit 14 includes electric capacity C2, resistance R3, electric capacity C8, described electric capacity C2 mono-
End is connected with GNDB ends, and the other end is connected with integrated chip U2 VREF ends, and described resistance R3 one end is with integrated chip U2's
VREF ends are connected, and the other end is connected with integrated chip U2 RT/CT ends, described electric capacity C8 one end and integrated chip U2 RT/
CT ends are connected, and the other end is connected with integrated chip U2 GND ends.
Preferably, described current-limiting circuit 3 includes resistance R8, the described FET Q1 first via passes through resistance R8
It is connected with integrated chip U2 OUT terminal.
Preferably, the first described current sampling circuit 6 includes resistance R9, resistance R11, described resistance R9 and resistance
R11 constitutes one end after parallel circuit and is connected with FET Q1 the 3rd tunnel, and the other end is connected with freewheeling circuit 8.
Preferably, the first described filter circuit 4 includes resistance R4, electric capacity C5, described resistance R4 one end with it is integrated
Chip U2 SEN ends connection, the other end is connected with described FET Q1 the 3rd tunnel, described electric capacity C5 one end and integrated core
Piece U2 SEN ends connection, the other end is connected with GNDB ends.
Preferably, described freewheeling circuit 8 includes power inductance L1, power diode D2, the power diode D2
Input be connected with OUT- ends, power diode D2 output end is connected by power inductance L1 with QDH ends.
Preferably, also include the second current sampling circuit 7, described the second current sampling circuit 7 include resistance R12,
Resistance R13, described resistance R12 and resistance R13 constitute one end after parallel circuit and are connected with power inductance L1, the other end and power
Diode D2 output end connection.
Preferably, also including the first RC absorbing circuits 10, the first described RC absorbing circuits 10 include resistance R17, electricity
Hold C11, described resistance R17 and described electric capacity C11 are in parallel with described power diode D2 after connecting.
Preferably, also including slope equalizer 13, described slope equalizer 13 includes triode Q3, resistance
R5, resistance R10, the colelctor electrode c of the triode Q3 are connected with described integrated chip U2 VREF ends, the triode Q3's
Base stage b is connected with the RT/CT ends of the integrated chip U2, and the emitter e of the triode Q3 passes through the tunnels of resistance R5 mono- and first
Filter circuit 4 is connected, and another road is connected by resistance R10 with FET Q1 the 3rd tunnel.
Preferably, also including the 2nd RC absorbing circuits 5, the 2nd described RC absorbing circuits 5 include resistance R14, electric capacity
C15, described resistance R14 and electric capacity C15 constitute one end after series circuit and are connected with FET Q1 the second tunnel, the other end and
FET Q1 the 3rd tunnel connection.
Preferably, also including closed loop current backfeed loop 12, described closed loop current backfeed loop 12 includes integrated core
Piece U1, electric capacity C12, electric capacity C13, resistance R2, resistance R15, resistance R16, adjustable resistance RT1, described integrated chip U1's is same
Phase input is connected with FET Q1 the 3rd tunnel, and integrated chip U1 inverting input is connected by resistance R16 and GNDB ends
Connect, integrated chip U1 output end is connected by resistance R15 with integrated chip U2 VFB ends, described electric capacity C12 and adjustable electric
One end is connected with integrated chip U1 inverting input after resistance RT1 is in parallel, and the other end is connected with integrated chip U1 output end, institute
One end is connected with integrated chip U2 COMP ends after the electric capacity C13 stated is in parallel with described resistance R2, the other end and integrated chip
U2 VFB ends connection.
Preferably, also include the second filter circuit 11, described the second filter circuit 11 include resistance R6, resistance R7,
Electric capacity C14, described resistance R6 one end is connected with FET Q1 the 3rd tunnel, and the other end is same mutually defeated with integrated chip U1's
Enter end connection, described resistance R7 one end is connected with integrated chip U1 in-phase input end, and the other end connects with freewheeling circuit 8
Connect, described electric capacity C14 one end is connected with the in-phase input end of the integrated chip U1, and the other end is connected with GNDB ends.
Embodiment 2
As shown in figure 1, during work, after powered up, the voltage of input passes through power diode D3 rectifications to CUT
And the dc bus electricity after electric capacity C1, electric capacity C6, electric capacity C9, electric capacity C10 filtering as arc maintenance electronics current-limiting resistance circuit
Source.The electric current that auxiliary power supply end YH1 is provided passes through diode D1 rectifications, and is used as auxiliary after electric capacity C3, electric capacity C4 filtering
Power input is to integrated chip U2 VCC ends so that integrated chip U2 is powered and started working.
Then integrated chip U2 OUT terminal output PWM opens signal so that FET Q1 is turned on by driving, makes direct current female
Line power supply is by FET Q1, resistance R9, resistance R11, power inductance L1 and exports to QDH ends, due to power inductance L1's
Electric current in effect, FET Q1 is linear rise, and it is also on linear to flow through resistance R9, resistance R11 electric current and voltage
Rise.
Voltage on resistance R9, resistance R11 is all the way by resistance R6, electric capacity C14 feeding integrated chip U1 homophase input
End, integrated chip U1 is to the VFB ends of feeding integrated chip U2 after the amplification of voltage signal progress certain multiple, integrated chip U2
VFB ends function be error amplifier, integrated chip U2 with reference to VFB ends magnitude of voltage and adjust PWM pulse width with up to
To the purpose of limitation output current.
Another road of voltage is sent to integrated chip U2 SEN ends and more than after threshold values on resistance R9, resistance R11, integrated
Chip U2 OUT terminal closes PWM and opens signal, for protecting FET Q1 not damaged because of excessively stream, FET Q1 quilts
Close cut-off.When FET Q1 ends due to dc bus loop have stray inductance can scene effect pipe Q1 the second tunnel and the
Peak voltage is produced between three tunnels it is possible to cause FET Q1 damage, and the of resistance R14, electric capacity C15 composition
Two RC absorbing circuits can slow down the amplitude of spike, it is ensured that the stabilization of circuit.
After FET Q1 cut-offs, magnetic energy is still stored on power inductance L1, and it is continuous to begin through power diode D2
Stream output to QDH ends, then flow through resistance R12, resistance R13 electric current and voltage sent into after resistance R7, electric capacity C14 it is integrated
Chip U1 in-phase input end, integrated chip U1 carries out sending into integrated chip U2's after the amplification of certain multiple to voltage signal
VFB ends, integrated chip U2 refers to the magnitude of voltage at VFB ends and adjusts PWM pulse width to reach the purpose of limitation output current,
Until integrated chip U2 work period terminates and starts second work period, so circulate.
When integrated chip U2 second work period of first job end cycle and beginning, FET Q1 is again
Turned on by driving, now DC bus-bar voltage can make by FET Q1, resistance R9, resistance R11, resistance R12, resistance R13
Power diode D2 enters the state reversely turned off, because dc bus loop has stray inductance can be the two of power diode D2
End produces peak voltage, and the first RC absorbing circuits of resistance R17, electric capacity C11 composition can slow down the amplitude of spike, so as to ensure
The stabilization of circuit.
So circulation, so that the loss during reducing arc maintenance, improves the operating efficiency of arc maintenance.
In a word, preferred embodiment of the present utility model, all scopes according to present utility model application patent be the foregoing is only
The equivalent changes and modifications made, should all belong to covering scope of the present utility model.
Claims (15)
1. a kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit（1）, filtering output circuit
（9）, described current rectifying and wave filtering circuit（1）Two ends be connected respectively with OUT+ ends, OUT- ends, described filtering output circuit（9）
Two ends be connected respectively with QDH ends, OUT- ends, it is characterised in that：Also include auxiliary power circuit（2）, frequency configuration circuit
（14）, current-limiting circuit（3）, FET Q1, integrated chip U2, the first current sampling circuit（6）, the first filter circuit（4）, it is continuous
Current circuit（8）, described FET Q1 includes three tunnels, and described integrated chip U2 OUT terminal passes through current-limiting circuit（3）With
FET Q1 first via connection, described current rectifying and wave filtering circuit（1）It is connected with FET Q1 the second tunnel, described collection
SEN ends into chip U2 pass through the first filter circuit（4）It is connected all the way with integrated chip U2 the 3rd tunnel, another road passes through first
Current sampling circuit（6）, freewheeling circuit（8）It is connected with QDH ends, described frequency configuration circuit（14）Respectively with integrated chip U2
RT/CT ends, GND ends, VREF ends connection, described auxiliary power circuit（2）It is connected with integrated chip U2 VCC ends.
2. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Current rectifying and wave filtering circuit（1）Including power diode D3, electric capacity C1, electric capacity C9, electric capacity C10, electric capacity C6, described electric capacity C1, electricity
Hold one end after C9, electric capacity C10, electric capacity C6 composition parallel circuits to be connected with power diode D3 output end, the other end and OUT-
End connection, described power diode D3 input is connected with OUT+ ends, power diode D3 output end also with field-effect
Pipe Q1 the second tunnel connection.
3. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Filtering output circuit（9）Including resistance R19, R20, R21, electric capacity C7, described resistance R19, resistance R20, resistance R21 are constituted
In parallel with electric capacity C7 after series circuit, described electric capacity C7 one end is connected with QDH ends, and the other end is connected with OUT- ends.
4. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Auxiliary power circuit（2）Including auxiliary power supply end YH1, diode D1, electric capacity C3, electric capacity C4, described diode D1's is defeated
Enter end to be connected with auxiliary power supply end YH1 positive pole, diode D1 output end is connected with integrated chip U2 VCC ends, described
Electric capacity C3, electric capacity C4 constitute one end after parallel circuit and are connected with integrated chip U2 VCC ends, and the other end is connected with GNDB ends.
5. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Frequency configuration circuit（14）Including electric capacity C2, resistance R3, electric capacity C8, described electric capacity C2 one end is connected with GNDB ends, another
End be connected with integrated chip U2 VREF ends, described resistance R3 one end is connected with integrated chip U2 VREF ends, the other end and
Integrated chip U2 RT/CT ends connection, described electric capacity C8 one end is connected with integrated chip U2 RT/CT ends, the other end and collection
Connected into chip U2 GND ends.
6. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Current-limiting circuit（3）Including resistance R8, the described FET Q1 first via passes through resistance R8 and integrated chip U2 OUT terminal
Connection.
7. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
The first current sampling circuit（6）Including resistance R9, resistance R11, it is latter that described resistance R9 and resistance R11 constitutes parallel circuit
End is connected with FET Q1 the 3rd tunnel, the other end and freewheeling circuit（8）Connection.
8. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
The first filter circuit（4）Including resistance R4, electric capacity C5, described resistance R4 one end is connected with integrated chip U2 SEN ends, separately
One end is connected with described FET Q1 the 3rd tunnel, and described electric capacity C5 one end is connected with integrated chip U2 SEN ends, another
End is connected with GNDB ends.
9. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Freewheeling circuit（8）Connect including power inductance L1, power diode D2, the power diode D2 input and OUT- ends
Connect, power diode D2 output end is connected by power inductance L1 with QDH ends.
10. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 9, it is characterised in that：Also
Including the second current sampling circuit（7）, described the second current sampling circuit（7）Including resistance R12, resistance R13, described electricity
Resistance R12 and resistance R13 constitutes one end after parallel circuit and is connected with power inductance L1, the output end of the other end and power diode D2
Connection.
11. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 9, it is characterised in that：Also
Including the first RC absorbing circuits（10）, described the first RC absorbing circuits（10）Including resistance R17, electric capacity C11, described resistance
R17 and described electric capacity C11 are in parallel with described power diode D2 after connecting.
12. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：Also
Including slope equalizer（13）, described slope equalizer（13）Including triode Q3, resistance R5, resistance R10, described three
Pole pipe Q3 colelctor electrode c is connected with described integrated chip U2 VREF ends, the base stage b of the triode Q3 and the integrated core
Piece U2 RT/CT ends connection, the emitter e of the triode Q3 passes through the tunnels of resistance R5 mono- and the first filter circuit（4）Connection, separately
It is connected all the way by resistance R10 with FET Q1 the 3rd tunnel.
13. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：Also
Including the 2nd RC absorbing circuits（5）, described the 2nd RC absorbing circuits（5）Including resistance R14, electric capacity C15, described resistance
R14 and electric capacity C15 constitute one end after series circuit and are connected with FET Q1 the second tunnel, and the of the other end and FET Q1
Three tunnels are connected.
14. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：Also
Including closed loop current backfeed loop（12）, described closed loop current backfeed loop（12）Including integrated chip U1, electric capacity C12, electricity
Hold C13, resistance R2, resistance R15, resistance R16, adjustable resistance RT1, described integrated chip U1 in-phase input end and field-effect
Pipe Q1 the 3rd tunnel connection, integrated chip U1 inverting input is connected by resistance R16 with GNDB ends, and integrated chip U1's is defeated
Go out end be connected by resistance R15 with integrated chip U2 VFB ends, after described electric capacity C12 is in parallel with adjustable resistance RT1 one end and
Integrated chip U1 inverting input connection, the other end is connected with integrated chip U1 output end, described electric capacity C13 with it is described
Resistance R2 it is in parallel after one end be connected with integrated chip U2 COMP ends, the other end is connected with integrated chip U2 VFB ends.
15. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 14, it is characterised in that：Also
Including the second filter circuit（11）, described the second filter circuit（11）Including resistance R6, resistance R7, electric capacity C14, described electricity
Resistance R6 one end is connected with FET Q1 the 3rd tunnel, and the other end is connected with integrated chip U1 in-phase input end, described
Resistance R7 one end is connected with integrated chip U1 in-phase input end, the other end and freewheeling circuit（8）Connection, described electric capacity
C14 one end is connected with the in-phase input end of the integrated chip U1, and the other end is connected with GNDB ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720260402.4U CN206605143U (en) | 2017-03-17 | 2017-03-17 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720260402.4U CN206605143U (en) | 2017-03-17 | 2017-03-17 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
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| CN206605143U true CN206605143U (en) | 2017-11-03 |
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| CN201720260402.4U Withdrawn - After Issue CN206605143U (en) | 2017-03-17 | 2017-03-17 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735800A (en) * | 2017-03-17 | 2017-05-31 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
-
2017
- 2017-03-17 CN CN201720260402.4U patent/CN206605143U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735800A (en) * | 2017-03-17 | 2017-05-31 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
| CN106735800B (en) * | 2017-03-17 | 2022-04-01 | 浙江三锋实业股份有限公司 | Plasma cutting machine pilot arc electron current-limiting resistance circuit |
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