CN110695503B - Rectifying circuit for inhibiting reverse peak voltage and air plasma cutting machine - Google Patents
Rectifying circuit for inhibiting reverse peak voltage and air plasma cutting machine Download PDFInfo
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- CN110695503B CN110695503B CN201910983965.XA CN201910983965A CN110695503B CN 110695503 B CN110695503 B CN 110695503B CN 201910983965 A CN201910983965 A CN 201910983965A CN 110695503 B CN110695503 B CN 110695503B
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- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 25
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- 239000003990 capacitor Substances 0.000 claims description 48
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
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Abstract
The invention belongs to the technical field of electronics, and discloses a rectifying circuit for inhibiting reverse spike voltage and an air plasma cutting machine, wherein reverse recovery current of a first upper bridge arm is inhibited through a first inductance component; the second inductance component suppresses reverse recovery current of the second upper bridge arm; the third inductance component suppresses reverse recovery current of the first lower bridge arm; the fourth inductance component inhibits reverse recovery current of the second lower bridge arm; the first absorption circuit absorbs the energy stored by the first inductance component and the energy stored by the third inductance component; the second absorption circuit absorbs the energy stored by the second inductance component and the energy stored by the fourth inductance component; therefore, the suppression effect of the reverse peak voltage of the rectifying circuit is improved, and the loss is reduced.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a rectifying circuit for inhibiting reverse spike voltage and an air plasma cutting machine.
Background
Along with the development of inversion technology, the inverter type air plasma cutting machine is also widely applied, but the reliability problem of the inverter type air plasma cutting machine is always a difficult problem for various manufacturers, and particularly the reliability problem of the output rectifier diode is most serious. Because the air plasma cutting machine is used as a special power supply, the process is very special, the rated output voltage is required to be (80+0.4I) V, and the actual working voltage is often 120V to 160V, so that the idle voltage is generally required to be higher than 200V, and the idle voltage is required to be higher than 300V in order to ensure the cutting operability. The air plasma cutting machine adopts a general inversion conversion scheme, namely, AC, DC, AC and DC are sequentially carried out, and the output voltage of 300V has very high requirements on a rectifier diode in an output rectification link, because the reverse spike voltage generated when the rectifier diode is turned from on to off often reaches 2 times or more of the platform voltage. In order to ensure the reliability of the output rectifier diode and inhibit the reverse voltage spike of the rectifier diode, the current general solution is that the output rectifier circuit adopts a full-bridge topology structure, meanwhile, an inductance (a magnetic ring with high magnetic permeability is sleeved on a line) is added between the upper bridge connection point and the lower bridge connection point of the full-bridge rectifier circuit and the secondary side of the transformer, and finally, an absorption circuit is connected in parallel on each bridge arm, as shown in fig. 1.
The circuit shown in fig. 1 is mainly intended to suppress the reverse recovery current of the rectifier diode by the inductance between the upper and lower bridge connection points and the secondary side of the transformer, and to absorb the generated reverse spike voltage by a resistor-capacitor circuit connected in parallel with the rectifier diode. However, in this circuit, when the freewheeling state is switched to the inversion on state, that is, one of the upper and lower bridge arms is gradually turned off by the freewheeling current, and the other bridge arm is raised to the rated current by the freewheeling current, at this time, the current will quickly saturate the inductor and lose the inhibition effect on the reverse recovery current of the other bridge arm, so the resistor-capacitor circuit connected in parallel with the rectifier diode mainly absorbs the generated voltage spike, so in order to achieve a certain absorption effect, a large-capacity absorption capacitor and a large-power absorption resistor are often required to be selected, resulting in serious loss of the whole machine. And the absorption effect of the resistance-capacitance circuit on the reverse peak is obviously reduced along with the increase of the inversion frequency.
Therefore, the traditional rectifying circuit for inhibiting peak voltage has the defects that one bridge arm of the upper bridge arm and the lower bridge arm is gradually turned off by the follow current, and when the other bridge arm is raised to rated current by the follow current, the current can quickly saturate the inductor to lose the inhibiting effect on the reverse recovery current of the other bridge arm, so that the loss is large and the inhibiting effect on the peak voltage is poor.
Disclosure of Invention
The invention provides a rectifying circuit for inhibiting reverse spike voltage and an air plasma cutting machine, and aims to solve the problems that in a traditional rectifying circuit, one of an upper bridge arm and a lower bridge arm is gradually turned off by a follow current, and when the follow current rises to rated current, the current can quickly saturate an inductor and lose the inhibiting effect on reverse recovery current of the other bridge arm, so that loss is large and the inhibiting effect on spike voltage is poor.
The invention is realized in such a way, the rectifying circuit for inhibiting the reverse spike voltage comprises a follow current inductance component, a transformer, a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm; the peak voltage suppressing rectifier circuit further includes:
the first inductance component is connected with the first end of the secondary side of the transformer and the input end of the first upper bridge arm and is used for inhibiting reverse recovery current of the first upper bridge arm;
the second inductance component is connected with the second end of the secondary side of the transformer and the input end of the second upper bridge arm and is used for inhibiting reverse recovery current of the second upper bridge arm;
the third inductance component is connected with the first end of the secondary side of the transformer and the output end of the first lower bridge arm and is used for inhibiting reverse recovery current of the first lower bridge arm;
The fourth inductance component is connected with the second end of the secondary side of the transformer and the output end of the second lower bridge arm and is used for inhibiting reverse recovery current of the second lower bridge arm;
the first absorption circuit is connected with the first inductance component, the input end of the first upper bridge arm, the third inductance component and the output end of the first lower bridge arm and is used for absorbing the energy stored by the first inductance component and the energy stored by the third inductance component;
The second absorption circuit is connected with the second inductance component, the input end of the second upper bridge arm, the fourth inductance component and the output end of the second lower bridge arm and is used for absorbing the energy stored by the second inductance component and the energy stored by the fourth inductance component;
And the freewheel inductance component is connected with the input end of the first lower bridge arm and the input end of the second lower bridge arm.
In one embodiment, the rectifying circuit for suppressing a reverse spike voltage further includes:
the third absorption circuit is connected with the first upper bridge arm in parallel and is used for absorbing the reverse peak voltage of the first upper bridge arm;
The fourth absorption circuit is connected with the first lower bridge arm in parallel and is used for absorbing the reverse peak voltage of the first lower bridge arm;
A fifth absorption circuit connected in parallel with the second upper bridge arm and used for absorbing the reverse spike voltage of the second upper bridge arm;
And the sixth absorption circuit is connected with the first lower bridge arm in parallel and is used for absorbing the reverse spike voltage of the first lower bridge arm.
In one embodiment, the third snubber circuit, the fourth snubber circuit, the fifth snubber circuit, and the sixth snubber circuit are all resistor-capacitor circuits.
In one embodiment, the resistor-capacitor circuit includes a first resistor and a first capacitor;
The first end of the first resistor is the input end of the resistor-capacitor circuit, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is the output end of the resistor-capacitor circuit.
In one embodiment, the first snubber circuit includes a second resistor and a second capacitor;
the first end of the second resistor is a first input/output end of the first absorption circuit, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is a second input/output end of the first absorption circuit.
In one embodiment, the second snubber circuit includes a third resistor and a third capacitor;
the first end of the third resistor is a first input/output end of the second absorption circuit, the second end of the third resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is a second input/output end of the second absorption circuit.
In one embodiment, the first inductor assembly comprises a first inductor, the second inductor assembly comprises a second inductor, the third inductor assembly comprises a third inductor, the fourth inductor assembly comprises a fourth inductor, and the freewheel inductor assembly comprises a freewheel inductor.
In one embodiment, the first upper leg, the first lower leg, the second upper leg, and the second lower leg each include a leg circuit.
In one embodiment, the bridge arm circuit includes a first diode and a second diode;
The positive electrode of the first diode and the positive electrode of the second diode jointly form the input end of the bridge arm circuit, and the negative electrode of the first diode and the negative electrode of the second diode jointly form the output end of the bridge arm circuit.
The embodiment of the invention also provides an air plasma cutting machine, which comprises the rectifying circuit for inhibiting the reverse spike voltage.
In the embodiment of the invention, the inductance component is added between each bridge arm and the secondary side of the transformer, one of the upper bridge arm and the lower bridge arm is gradually turned off by the follow current, the other bridge arm is saturated by the inductance corresponding to the one bridge arm rapidly when the follow current rises to the rated current, the reverse recovery current of the other bridge arm is restrained by the inductance corresponding to the other bridge arm, and the absorption circuit is arranged between the upper bridge arm and the lower bridge arm to absorb the energy stored by the inductance when the reverse recovery current is restrained, so that the restraining effect of the reverse peak voltage is improved, and the loss is reduced.
Drawings
In order to more clearly illustrate the technical invention in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it will be apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
FIG. 1 is a circuit configuration diagram of an example of a conventional rectifying circuit for suppressing reverse spike voltage;
FIG. 2 is a block diagram of a rectifier circuit for suppressing reverse spike voltage according to an embodiment of the present invention;
FIG. 3 is a block diagram of another rectifier circuit for suppressing reverse spike voltage according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a rectifier circuit for suppressing reverse spike voltage according to an embodiment of the present invention;
fig. 5 is a voltage waveform diagram of a secondary side of a transformer in a rectifier circuit for suppressing reverse spike voltage according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 2 shows a block structure of a rectifying circuit for suppressing reverse spike voltage according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, and the details are as follows:
the rectifier circuit for suppressing the reverse spike voltage includes a freewheeling inductor assembly 01, a transformer T1, a first upper arm 02, a first lower arm 03, a second upper arm 04, and a second lower arm 05: the rectifying circuit for suppressing the reverse spike voltage further includes a first inductance component 06, a second inductance component 07, a third inductance component 08, a fourth inductance component 09, a first snubber circuit 10, and a second snubber circuit 11.
The first inductance component 06 is connected with a first end of a secondary side of the transformer T1 and an input end of the first upper bridge arm 02 and is used for inhibiting reverse recovery current of the first upper bridge arm 02; the second inductance component 07 is connected with a second end of a secondary side of the transformer T1 and an input end of the second upper bridge arm 04, and is used for inhibiting reverse recovery current of the second upper bridge arm 04; the third inductance component 08 is connected with the first end of the secondary side of the transformer T1 and the output end of the first lower bridge arm 03, and is used for inhibiting the reverse recovery current of the first lower bridge arm 03; the fourth inductance component 09 is connected with the second end of the secondary side of the transformer T1 and the output end of the second lower bridge arm 05, and is used for inhibiting reverse recovery current of the second lower bridge arm 05; the first absorption circuit 10 is connected with the first inductance component 06, the input end of the first upper bridge arm 02, the third inductance component 08 and the output end of the first lower bridge arm 03, and is used for absorbing the energy stored in the first inductance component 06 and the energy stored in the third inductance component 08; the second absorption circuit 11 is connected with the second inductance component 07, the input end of the second upper bridge arm 04, the fourth inductance component 09 and the output end of the second lower bridge arm 05, and is used for absorbing the energy stored by the second inductance component 07 and the energy stored by the fourth inductance component 09; the freewheel inductor assembly 01 is connected to the input of the first lower leg 03 and to the input of the second lower leg 05.
As shown in fig. 3, the rectifier circuit that suppresses the reverse spike voltage further includes a third snubber circuit 12, a fourth snubber circuit 13, a fifth snubber circuit 14, and a sixth snubber circuit 15.
The third absorption circuit 12 is connected in parallel with the first upper bridge arm 02 and is used for absorbing the reverse spike voltage of the first upper bridge arm 02; the fourth absorption circuit 13 is connected in parallel with the first lower bridge arm 03 and is used for absorbing the reverse spike voltage of the first lower bridge arm 03; the fifth absorption circuit 14 is connected in parallel with the second upper bridge arm 04 and is used for absorbing the reverse spike voltage of the second upper bridge arm 04; the sixth snubber circuit 15 is connected in parallel to the first lower arm 03 and is configured to absorb the reverse spike voltage of the first lower arm 03.
By providing the third snubber circuit 12 to the sixth snubber circuit 15, the effect of reverse spike voltage suppression is further improved.
Fig. 4 shows an exemplary circuit structure of a rectifying circuit for suppressing reverse spike voltage according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, and the details are as follows:
The third snubber circuit 12, the fourth snubber circuit 13, the fifth snubber circuit 14, and the sixth snubber circuit 15 are all resistance-capacitance circuits, and the resistance-capacitance circuits include a first resistor R1 and a first capacitor C1.
The first end of the first resistor R1 is an input end of the resistor-capacitor circuit, the second end of the first resistor R1 is connected with the first end of the first capacitor C1, and the second end of the first capacitor C1 is an output end of the resistor-capacitor circuit.
The first snubber circuit 10 includes a second resistor R2 and a second capacitor C2.
The first end of the second resistor R2 is a first input/output end of the first snubber circuit 10, the second end of the second resistor R2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is a second input/output end of the first snubber circuit 10.
The second snubber circuit 11 includes a third resistor R3 and a third capacitor C3.
The first end of the third resistor R3 is a first input/output end of the second absorption circuit 11, the second end of the third resistor R3 is connected with the first end of the third capacitor C3, and the second end of the third capacitor C3 is a second input/output end of the second absorption circuit 11.
The first inductance assembly 06 includes a first inductance L1, the second inductance assembly 07 includes a second inductance L2, the third inductance assembly 08 includes a third inductance L3, and the fourth inductance assembly 09 includes a fourth inductance L4.
The first upper bridge arm 02, the first lower bridge arm 03, the second upper bridge arm 04 and the second lower bridge arm 05 all comprise bridge arm circuits, and the bridge arm circuits comprise a first diode D1 and a second diode D2.
The positive electrode of the first diode D1 and the positive electrode of the second diode D2 jointly form an input end of the bridge arm circuit, and the negative electrode of the first diode D1 and the negative electrode of the second diode D2 jointly form an output end of the bridge arm circuit.
The following further describes the operation principle shown in fig. 4:
The waveform of the output voltage of the secondary side of the transformer T1 is shown in fig. 5.
And in the time period of 0 to t1, the first upper bridge arm 02 and the second lower bridge arm 05 are conducted, the first lower bridge arm 03 and the second upper bridge arm 04 are cut off, and the follow current inductor L0 is charged.
During the time period from T1 to T2, the output voltage of the secondary side of the transformer T1 is 0, the freewheeling inductor discharges, and the freewheeling current forms a loop through the first branch (the first branch includes the first lower leg 03, the third inductor L3, the first inductor L1 and the first upper leg 02), the load RD and the freewheeling inductor L0, or the second branch (the second branch includes the second lower leg 05, the fourth inductor L4, the second inductor L2 and the second upper leg 04), the load RD and the freewheeling inductor L0.
At time t2, the second upper arm 04 and the first lower arm 03 are turned on, the first upper arm 02 and the second lower arm 05 are turned off, the diodes (the first diode D1 and the second diode D2) in the first upper arm 02 and the diodes (the first diode D1 and the second diode D2) in the second lower arm 05 generate reverse recovery currents, the first inductor L1 is charged to suppress the reverse recovery currents generated by the diodes (the first diode D1 and the second diode D2) in the first upper arm 02, and the fourth inductor L4 is charged to suppress the reverse recovery currents generated by the diodes (the first diode D1 and the second diode D2) in the second lower arm 05; after the reverse recovery of the diode in the first upper bridge arm 02 and the diode in the second lower bridge arm 05, the first inductor L1 and the fourth inductor L4 are discharged, and the second resistor R2 and the second capacitor C2 absorb the energy released by the first inductor L1 through the first loop (the first loop includes the third inductor L3, the first inductor L1, the second resistor R2 and the second capacitor C2), and the third resistor R3 and the third capacitor C3 absorb the energy released by the fourth inductor L4 through the second loop (the second loop includes the second inductor L2, the fourth inductor L4, the third resistor R3 and the third capacitor C3).
During the time period from T3 to T4, the output voltage of the secondary side of the transformer T1 is 0, the freewheeling inductor discharges, and the freewheeling current forms a loop through the first branch (the first branch includes the first lower leg 03, the third inductor L3, the first inductor L1 and the first upper leg 02), the load RD and the freewheeling inductor L0, or the second branch (the second branch includes the second lower leg 05, the fourth inductor L4, the second inductor L2 and the second upper leg 04), the load RD and the freewheeling inductor L0.
At time t4, the first upper bridge arm 02 and the second lower bridge arm 05 are turned on, the first lower bridge arm 03 and the second upper bridge arm 04 are turned off, the diodes (the first diode D1 and the second diode D2) in the first lower bridge arm 03 and the diodes (the first diode D1 and the second diode D2) in the second upper bridge arm 04 generate reverse recovery currents, the third inductor L1 is charged to suppress the reverse recovery currents generated by the diodes (the first diode D1 and the second diode D2) in the first lower bridge arm 03, and the second inductor L2 is charged to suppress the reverse recovery currents generated by the diodes (the first diode D1 and the second diode D2) in the second upper bridge arm 04; after the diodes in the first lower bridge arm 03 and the diodes in the second upper bridge arm 04 are reversely recovered, the third inductor L3 and the second inductor L2 are discharged, the second resistor R2 and the second capacitor C2 absorb energy released by the third inductor L3 through a first loop (the first loop includes the third inductor L3, the first inductor L1, the second resistor R2 and the second capacitor C2), and the third resistor R3 and the third capacitor C3 absorb energy released by the second inductor L2 through a second loop (the second loop includes the second inductor L2, the fourth inductor L4, the third resistor R3 and the third capacitor C3).
Similarly, the principle of the rectifier circuit for suppressing the reverse spike voltage in each period of the nth cycle of the output voltage of the secondary side of the transformer T1 can be derived.
The embodiment of the invention also provides an air plasma cutting machine, which comprises the rectifying circuit for inhibiting reverse spike voltage.
The embodiment of the invention comprises a follow current inductance component, a transformer, a first upper bridge arm, a first lower bridge arm, a second upper bridge arm, a second lower bridge arm, a first inductance component, a second inductance component, a third inductance component, a fourth inductance component, a first absorption circuit and a second absorption circuit; the first inductance component inhibits reverse recovery current of the first upper bridge arm; the second inductance component inhibits reverse recovery current of the second upper bridge arm; the third inductance component suppresses reverse recovery current of the first lower bridge arm; the fourth inductance component inhibits reverse recovery current of the second lower bridge arm; the first absorption circuit absorbs the energy stored by the first inductance component and the energy stored by the third inductance component; the second absorption circuit absorbs the energy stored by the second inductance component and the energy stored by the fourth inductance component; because the inductance components are added between each bridge arm and the secondary side of the transformer, one of the upper and lower bridge arms is gradually turned off by the follow current, and the other bridge arm is saturated by the inductance corresponding to the one bridge arm rapidly when the follow current rises to the rated current, the reverse recovery current of the other bridge arm is restrained by the inductance corresponding to the other bridge arm, and the absorption circuit is arranged between the upper and lower bridge arms to absorb the electric energy stored by the inductance when the reverse recovery current is restrained, the restraining effect of the reverse peak voltage is improved, and the loss is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The rectifying circuit for suppressing the reverse spike voltage is characterized by comprising a follow current inductance component, a transformer, a first upper bridge arm, a first lower bridge arm, a second upper bridge arm and a second lower bridge arm: the rectification circuit for suppressing reverse spike voltage is characterized by further comprising:
the first inductance component is connected with the first end of the secondary side of the transformer and the input end of the first upper bridge arm and is used for inhibiting reverse recovery current of the first upper bridge arm;
the second inductance component is connected with the second end of the secondary side of the transformer and the input end of the second upper bridge arm and is used for inhibiting reverse recovery current of the second upper bridge arm;
the third inductance component is connected with the first end of the secondary side of the transformer and the output end of the first lower bridge arm and is used for inhibiting reverse recovery current of the first lower bridge arm;
The fourth inductance component is connected with the second end of the secondary side of the transformer and the output end of the second lower bridge arm and is used for inhibiting reverse recovery current of the second lower bridge arm;
the first absorption circuit is connected with the first inductance component, the input end of the first upper bridge arm, the third inductance component and the output end of the first lower bridge arm and is used for absorbing the energy stored by the first inductance component and the energy stored by the third inductance component;
The second absorption circuit is connected with the second inductance component, the input end of the second upper bridge arm, the fourth inductance component and the output end of the second lower bridge arm and is used for absorbing the energy stored by the second inductance component and the energy stored by the fourth inductance component;
And the freewheel inductance component is connected with the input end of the first lower bridge arm and the input end of the second lower bridge arm.
2. The reverse spike voltage suppressing rectifier circuit of claim 1 wherein said reverse spike voltage suppressing rectifier circuit further comprises:
the third absorption circuit is connected with the first upper bridge arm in parallel and is used for absorbing the reverse peak voltage of the first upper bridge arm;
The fourth absorption circuit is connected with the first lower bridge arm in parallel and is used for absorbing the reverse peak voltage of the first lower bridge arm;
A fifth absorption circuit connected in parallel with the second upper bridge arm and used for absorbing the reverse spike voltage of the second upper bridge arm;
And the sixth absorption circuit is connected with the first lower bridge arm in parallel and is used for absorbing the reverse spike voltage of the first lower bridge arm.
3. The rectifier circuit for suppressing a reverse spike voltage according to claim 2 wherein said third snubber circuit, said fourth snubber circuit, said fifth snubber circuit, and said sixth snubber circuit are all resistor-capacitor circuits.
4. The rectifier circuit for suppressing reverse spike voltage according to claim 3 wherein said resistor-capacitor circuit comprises a first resistor and a first capacitor;
The first end of the first resistor is the input end of the resistor-capacitor circuit, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is the output end of the resistor-capacitor circuit.
5. The rectifier circuit for suppressing a reverse spike voltage according to claim 1 wherein said first snubber circuit comprises a second resistor and a second capacitor;
the first end of the second resistor is a first input/output end of the first absorption circuit, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is a second input/output end of the first absorption circuit.
6. The rectifier circuit for suppressing a reverse spike voltage according to claim 1 wherein said second snubber circuit comprises a third resistor and a third capacitor;
the first end of the third resistor is a first input/output end of the second absorption circuit, the second end of the third resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is a second input/output end of the second absorption circuit.
7. The rectifier circuit of claim 1, wherein said first inductor assembly includes a first inductor, said second inductor assembly includes a second inductor, said third inductor assembly includes a third inductor, said fourth inductor assembly includes a fourth inductor, and said freewheel inductor assembly includes a freewheel inductor.
8. The rectifier circuit for suppressing a reverse spike voltage according to claim 1 wherein said first upper leg, said first lower leg, said second upper leg, and said second lower leg each comprise a leg circuit.
9. The rectifier circuit for suppressing reverse spike voltage of claim 8 wherein said bridge arm circuit includes a first diode and a second diode;
The positive electrode of the first diode and the positive electrode of the second diode jointly form the input end of the bridge arm circuit, and the negative electrode of the first diode and the negative electrode of the second diode jointly form the output end of the bridge arm circuit.
10. An air plasma cutter, characterized in that the air plasma cutter comprises a rectifying circuit for suppressing reverse spike voltage according to any one of claims 1 to 9.
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| CN201910983965.XA CN110695503B (en) | 2019-10-16 | 2019-10-16 | Rectifying circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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| CN201910983965.XA CN110695503B (en) | 2019-10-16 | 2019-10-16 | Rectifying circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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| CN110695503B true CN110695503B (en) | 2024-05-28 |
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| CN1484369A (en) * | 2002-09-21 | 2004-03-24 | 深圳市中兴通讯股份有限公司 | Circuit for suppressing reverse spike voltage of diode |
| CN102412715A (en) * | 2011-12-07 | 2012-04-11 | 杭州中恒电气股份有限公司 | Circuit of restraining reverse spike voltage output of commutation diode |
| CN104201874A (en) * | 2014-09-05 | 2014-12-10 | 武汉永力睿源科技有限公司 | Lossless absorption circuit of switching power supply output rectifier tube and switching power supply |
| CN204131384U (en) * | 2014-09-05 | 2015-01-28 | 武汉永力睿源科技有限公司 | A kind of Switching Power Supply exports lossless absorption circuit and the Switching Power Supply of rectifying tube |
| CN209497396U (en) * | 2019-03-28 | 2019-10-15 | 上海交通大学 | A kind of AC-DC circuit that power switch is preposition |
| CN110138195A (en) * | 2019-05-24 | 2019-08-16 | 哈尔滨工业大学 | Inhibit the lossless buffer circuit and its test circuit of GaN half-bridge module due to voltage spikes and current resonance |
| CN211331743U (en) * | 2019-10-16 | 2020-08-25 | 深圳市佳士科技股份有限公司 | Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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