CN211331743U - Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine - Google Patents
Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine Download PDFInfo
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- CN211331743U CN211331743U CN201921741240.1U CN201921741240U CN211331743U CN 211331743 U CN211331743 U CN 211331743U CN 201921741240 U CN201921741240 U CN 201921741240U CN 211331743 U CN211331743 U CN 211331743U
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Abstract
The utility model belongs to the technical field of electronics, and discloses a rectification circuit for inhibiting reverse peak voltage and an air plasma cutting machine, wherein a first inductance assembly is used for inhibiting reverse recovery current of a first upper bridge arm; the second inductance assembly restrains reverse recovery current of the second upper bridge arm; the third inductance assembly restrains reverse recovery current of the first lower bridge arm; the fourth inductance assembly restrains reverse recovery current of the second lower bridge arm; the first absorption circuit absorbs the energy stored by the first inductive component and the energy stored by the third inductive component; the second absorption circuit absorbs energy stored by the second inductive component and energy stored by the fourth inductive component; therefore, the suppression effect of reverse peak voltage of the rectifying circuit is improved, and the loss is reduced.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to a rectifier circuit and air plasma cutting machine of suppression reverse peak voltage.
Background
With the development of the inverter technology, the inverter type air plasma cutting machine is more and more widely applied, but the reliability problem of the inverter type air plasma cutting machine is always a difficult problem which puzzles various manufacturers, and particularly the reliability problem of an output rectifier diode is the 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, the actual working voltage often reaches 120V to 160V, the idle voltage is generally required to be higher than 200V, and the idle voltage is more than 300V to ensure the cutting operability. The air plasma cutting machine adopts a general inversion transformation scheme, namely AC, DC, AC and DC are sequentially carried out, the requirement of 300V output voltage on a rectifier diode in an output rectification link is very high, and the reverse spike voltage generated when the rectifier diode is switched from on to off is often 2 times or more higher than the platform voltage. In order to ensure the reliability of the output rectifier diode and suppress the reverse voltage spike of the rectifier diode, the current general solution is that the output rectifier circuit adopts a full-bridge topology structure, an inductor (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 to each bridge arm, as shown in fig. 1.
The circuit shown in fig. 1 is intended to suppress the reverse recovery current of the rectifier diode mainly by the inductance between the upper and lower bridge contacts and the secondary side of the transformer, and to absorb the generated reverse spike voltage by the resistance-capacitance circuit connected in parallel with the rectifier diode. However, in this circuit, when the freewheeling state is switched to the inverting on state, that is, one of the upper and lower arms is gradually turned off by the freewheeling current, and the other arm is increased to the rated current by the freewheeling current, the current quickly saturates the inductor and loses the suppression effect on the reverse recovery current of the other arm, so the generated voltage spike is absorbed mainly by the resistor-capacitor circuit in which the rectifier diodes are connected in parallel. And with the increase of the inversion frequency, the absorption effect of the resistance-capacitance circuit on the reverse spike is obviously reduced.
Therefore, the conventional rectification circuit for inhibiting the peak voltage has the defects that when one of the upper and lower bridge arms is gradually turned off by the follow current and the other bridge arm is increased to the 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.
SUMMERY OF THE UTILITY MODEL
The utility model provides an restrain reverse peak voltage's rectifier circuit and air plasma cutting machine aims at solving in the upper and lower bridge arm that traditional rectifier circuit exists certain bridge arm and is turn-offed by afterflow current gradually, and another bridge arm then rises to when rated current by afterflow current, and the electric current can make the inductance saturation rapidly and lose the inhibitory action to the reverse recovery electric current of another bridge arm to lead to the big and poor problem of peak voltage suppression effect of loss.
The utility model discloses a realize like this, a rectifier circuit of suppression reverse peak voltage, rectifier circuit of suppression peak voltage includes afterflow inductance component, transformer, first upper bridge arm, first lower bridge arm, second upper bridge arm and second lower bridge arm; the rectification circuit for suppressing the spike voltage further comprises:
the first inductance assembly is connected with the first end of the secondary side of the transformer and the input end of the first upper bridge arm and used for inhibiting the reverse recovery current of the first upper bridge arm;
the second inductance assembly is connected with the second end of the secondary side of the transformer and the input end of the second upper bridge arm and used for inhibiting the reverse recovery current of the second upper bridge arm;
the third inductance assembly is connected with the first end of the secondary side of the transformer and the output end of the first lower bridge arm and used for inhibiting the reverse recovery current of the first lower bridge arm;
the fourth inductance assembly is connected with the second end of the secondary side of the transformer and the output end of the second lower bridge arm and used for inhibiting the reverse recovery current of the second lower bridge arm;
the first absorption circuit is connected with the first inductance assembly, the input end of the first upper bridge arm, the third inductance assembly and the output end of the first lower bridge arm and is used for absorbing the energy stored by the first inductance assembly and the energy stored by the third inductance assembly;
the second absorption circuit is connected with the second inductance assembly, the input end of the second upper bridge arm, the fourth inductance assembly and the output end of the second lower bridge arm and is used for absorbing the energy stored by the second inductance assembly and the energy stored by the fourth inductance assembly;
and the follow current inductor 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 rectification circuit for suppressing reverse spike voltage further comprises:
the third absorption circuit is connected with the first upper bridge arm in parallel and is used for absorbing the reverse spike 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 spike voltage of the first lower bridge arm;
the fifth absorption circuit is connected with the second upper bridge arm in parallel and is 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 absorption circuit, the fourth absorption circuit, the fifth absorption circuit and the sixth absorption circuit are all resistance-capacitance circuits.
In one embodiment, the resistance-capacitance circuit comprises a first resistor and a first capacitor;
the first end of the first resistor is the input end of the resistance-capacitance 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 resistance-capacitance circuit.
In one embodiment, the first sinking 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.
In one embodiment, the second sinking circuit comprises a third resistor and a third capacitor;
the first end of the third resistor is the first input and 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 the second input and output end of the second absorption circuit.
In one embodiment, the first inductive component comprises a first inductor, the second inductive component comprises a second inductor, the third inductive component comprises a third inductor, the fourth inductive component comprises a fourth inductor, and the freewheeling inductor component comprises a freewheeling 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 comprises a first diode and a second diode;
the anode of the first diode and the anode of the second diode jointly form the input end of the bridge arm circuit, and the cathode of the first diode and the cathode of the second diode jointly form the output end of the bridge arm circuit.
The embodiment of the utility model provides a still provide an air plasma cutting machine, air plasma cutting machine includes the rectifier circuit of the reverse peak voltage of suppression as above-mentioned.
The embodiment of the utility model provides a because all increase the inductance subassembly between the vice limit of every bridge arm and transformer, certain bridge arm is turn-offed by afterflow current gradually in the upper and lower bridge arm, and another bridge arm is then by afterflow current when rising to rated current, the electric current can make the inductance saturation that certain bridge arm corresponds rapidly, and the reverse recovery current of another bridge arm suppresses through the inductance that another bridge arm corresponds, and set up absorption circuit between upper and lower bridge arm, absorb the inductance energy of saving when suppressing reverse recovery current, the event has improved reverse peak voltage's suppression effect, and the loss has been reduced.
Drawings
In order to more clearly illustrate the technical utility model in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of an exemplary conventional reverse spike voltage suppression rectifier circuit;
fig. 2 is a block diagram of a rectifier circuit for suppressing reverse peak voltage according to an embodiment of the present invention;
fig. 3 is another block diagram of a rectification circuit for suppressing reverse peak voltage according to an embodiment of the present invention;
fig. 4 is a circuit diagram illustrating an exemplary circuit structure of a rectifier circuit for suppressing reverse peak 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 rectification circuit for suppressing reverse peak voltage according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 2 shows a module structure of a rectification circuit for suppressing reverse spike voltage according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
the rectification circuit for inhibiting the reverse spike voltage comprises a follow current inductance component 01, a transformer T1, a first upper bridge arm 02, a first lower bridge arm 03, a second upper bridge arm 04 and a second lower bridge arm 05: the rectification circuit for suppressing reverse spike voltage further comprises a first inductance component 06, a second inductance component 07, a third inductance component 08, a fourth inductance component 09, a first absorption circuit 10 and a second absorption 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 suppressing a reverse recovery current of the first upper bridge arm 02; the second inductance assembly 07 is connected with the second end of the secondary side of the transformer T1 and the input end of the second upper bridge arm 04, and is used for suppressing the reverse recovery current of the second upper bridge arm 04; the third inductance assembly 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 suppressing the reverse recovery current of the first lower bridge arm 03; the fourth inductance assembly 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 suppressing the 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 energy stored in the first inductance component 06 and 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 energy stored in the second inductance component 07 and energy stored in the fourth inductance component 09; the freewheeling inductor 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 for suppressing 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 configured to absorb a reverse spike voltage of the first upper bridge arm 02; the fourth absorption circuit 13 is connected in parallel with the first lower arm 03 and is configured to absorb a reverse spike voltage of the first lower arm 03; the fifth absorption circuit 14 is connected in parallel with the second upper arm 04 and is configured to absorb the reverse spike voltage of the second upper arm 04; sixth absorption circuit 15 is connected in parallel to first lower arm 03, and is configured to absorb a reverse spike voltage of first lower arm 03.
By providing the third absorption circuit 12 to the sixth absorption circuit 15, the effect of reverse spike voltage suppression is further improved.
Fig. 4 shows an exemplary circuit structure of a rectification circuit for suppressing reverse spike voltage according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
the third absorption circuit 12, the fourth absorption circuit 13, the fifth absorption circuit 14 and the sixth absorption circuit 15 are all resistance-capacitance circuits, and each resistance-capacitance circuit includes a first resistor R1 and a first capacitor C1.
The first end of the first resistor R1 is an input end of the rc circuit, the second end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is an output end of the rc circuit.
The first sinking circuit 10 includes a second capacitor C2 of a second resistor R2.
A first terminal of the second resistor R2 is a first input/output terminal of the first snubber circuit 10, a second terminal of the second resistor R2 is connected to a first terminal of the second capacitor C2, and a second terminal of the second capacitor C2 is a second input/output terminal of the first snubber circuit 10.
The second snubber circuit 11 includes a third capacitor C3 having a third resistor R3.
A first terminal of the third resistor R3 is a first input/output terminal of the second snubber circuit 11, a second terminal of the third resistor R3 is connected to a first terminal of the third capacitor C3, and a second terminal of the third capacitor C3 is a second input/output terminal of the second snubber circuit 11.
The first inductive component 06 comprises a first inductance L1, the second inductive component 07 comprises a second inductance L2, the third inductive component 08 comprises a third inductance L3, and the fourth inductive component 09 comprises a fourth inductance L4.
First upper leg 02, first lower leg 03, second upper leg 04, and second lower leg 05 each include a leg circuit that includes a first diode D1 and a second diode D2.
An anode of the first diode D1 and an anode of the second diode D2 together form an input terminal of the bridge arm circuit, and a cathode of the first diode D1 and a cathode of the second diode D2 together form an output terminal of the bridge arm circuit.
The description of fig. 4 is further described below in conjunction with the working principle:
the output voltage waveform of the secondary side of the transformer T1 is shown in fig. 5.
When the time length is 0 to t1, the first upper bridge arm 02 and the second lower bridge arm 05 are switched on, the first lower bridge arm 03 and the second upper bridge arm 04 are switched 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 arm 03, the third inductor L3, the first inductor L1, and the first upper arm 02), the load RD, and the freewheeling inductor L0, or the second branch (the second branch includes the second lower arm 05, the fourth inductor L4, the second inductor L2, and the second upper arm 04), the load RD, and the freewheeling inductor L0 form a loop.
At time t2, second upper arm 04 and first lower arm 03 are turned on, first upper arm 02 and second lower arm 05 are turned off, diodes (first diode D1 and second diode D2) in first upper arm 02 and diodes (first diode D1 and second diode D2) in second lower arm 05 generate reverse recovery currents, first inductor L1 is charged to suppress the reverse recovery currents generated by the diodes (first diode D1 and second diode D2) in first upper arm 02, and fourth inductor L4 is charged to suppress the reverse recovery currents generated by the diodes (first diode D1 and second diode D2) in second lower arm 05; after the diodes in the first upper leg 02 and the second lower leg 05 recover in the reverse direction, the first inductor L1 and the fourth inductor L4 discharge, 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 arm 03, the third inductor L3, the first inductor L1, and the first upper arm 02), the load RD, and the freewheeling inductor L0, or the second branch (the second branch includes the second lower arm 05, the fourth inductor L4, the second inductor L2, and the second upper arm 04), the load RD, and the freewheeling inductor L0 form a loop.
At time t4, first upper leg 02 and second lower leg 05 are turned on, first lower leg 03 and second upper leg 04 are turned off, diodes (first diode D1 and second diode D2) in first lower leg 03 and diodes (first diode D1 and second diode D2) in second upper leg 04 generate reverse recovery currents, third inductor L1 is charged to suppress the reverse recovery currents generated by the diodes (first diode D1 and second diode D2) in first lower leg 03, and second inductor L2 is charged to suppress the reverse recovery currents generated by the diodes (first diode D1 and second diode D2) in second upper leg 04; after the diodes in the first lower leg 03 and the diodes in the second upper leg 04 are restored in the reverse direction, the third inductor L3 and the second inductor L2 discharge, the second resistor R2 and the second capacitor C2 absorb the energy released by the third inductor L3 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 second inductor L2 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).
By analogy, 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 obtained.
The embodiment of the utility model provides a still provide an air plasma cutting machine, air plasma cutting machine includes the rectifier circuit of the reverse peak voltage of suppression as above-mentioned.
The embodiment of the utility model provides a through including afterflow inductance assembly, transformer, first upper bridge arm, first lower bridge arm, second upper bridge arm, second lower bridge arm, first inductance assembly, second inductance assembly, third inductance assembly, fourth inductance assembly, first absorption circuit and second absorption circuit; the first inductance assembly restrains reverse recovery current of the first upper bridge arm; the second inductance assembly inhibits the reverse recovery current of the second upper bridge arm; the third inductance assembly inhibits the reverse recovery current of the first lower bridge arm; the fourth inductance assembly inhibits the reverse recovery current of the second lower bridge arm; the first absorption circuit absorbs the energy stored by the first inductive component and the energy stored by the third inductive component; the second absorption circuit absorbs the energy stored by the second inductance component and the energy stored by the fourth inductance component; the inductance assembly is 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, while the other bridge arm is gradually turned off by the follow current when the follow current rises to the rated current, the current can quickly saturate the inductance corresponding to the one bridge arm, the reverse recovery current of the other bridge arm is inhibited 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 inhibited, so that the inhibiting effect of the reverse peak voltage is improved, and the loss is reduced.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The rectification circuit for inhibiting 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 further comprises:
the first inductance assembly is connected with the first end of the secondary side of the transformer and the input end of the first upper bridge arm and used for inhibiting the reverse recovery current of the first upper bridge arm;
the second inductance assembly is connected with the second end of the secondary side of the transformer and the input end of the second upper bridge arm and used for inhibiting the reverse recovery current of the second upper bridge arm;
the third inductance assembly is connected with the first end of the secondary side of the transformer and the output end of the first lower bridge arm and used for inhibiting the reverse recovery current of the first lower bridge arm;
the fourth inductance assembly is connected with the second end of the secondary side of the transformer and the output end of the second lower bridge arm and used for inhibiting the reverse recovery current of the second lower bridge arm;
the first absorption circuit is connected with the first inductance assembly, the input end of the first upper bridge arm, the third inductance assembly and the output end of the first lower bridge arm and is used for absorbing the energy stored by the first inductance assembly and the energy stored by the third inductance assembly;
the second absorption circuit is connected with the second inductance assembly, the input end of the second upper bridge arm, the fourth inductance assembly and the output end of the second lower bridge arm and is used for absorbing the energy stored by the second inductance assembly and the energy stored by the fourth inductance assembly;
and the follow current inductance assembly 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 according to claim 1, further comprising:
the third absorption circuit is connected with the first upper bridge arm in parallel and is used for absorbing the reverse spike 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 spike voltage of the first lower bridge arm;
the fifth absorption circuit is connected with the second upper bridge arm in parallel and is 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 reverse spike voltage suppressing rectifier circuit of claim 2 wherein said third, fourth, fifth and sixth snubber circuits are all resistor-capacitor circuits.
4. The reverse spike voltage suppressing rectifier circuit of 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 resistance-capacitance 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 resistance-capacitance circuit.
5. The reverse spike voltage suppressing rectifying circuit according to claim 1, wherein said first sinking 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.
6. The reverse spike voltage suppressing rectifying circuit according to claim 1, wherein the second snubber circuit includes a third resistor and a third capacitor;
the first end of the third resistor is the first input and 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 the second input and output end of the second absorption circuit.
7. The reverse spike voltage suppression rectifier circuit of claim 1 wherein said first inductive component comprises a first inductor, said second inductive component comprises a second inductor, said third inductive component comprises a third inductor, said fourth inductive component comprises a fourth inductor, and said freewheeling inductive component comprises a freewheeling inductor.
8. The reverse spike voltage suppression rectifier circuit of claim 1 wherein the first upper leg, the first lower leg, the second upper leg, and the second lower leg each comprise a leg circuit.
9. The reverse spike voltage suppressing rectifier circuit of claim 8 wherein said leg circuit comprises a first diode and a second diode;
the anode of the first diode and the anode of the second diode jointly form the input end of the bridge arm circuit, and the cathode of the first diode and the cathode of the second diode jointly form the output end of the bridge arm circuit.
10. An air plasma cutting machine characterized by comprising the reverse spike voltage suppressing rectifying circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921741240.1U CN211331743U (en) | 2019-10-16 | 2019-10-16 | Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921741240.1U CN211331743U (en) | 2019-10-16 | 2019-10-16 | Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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| Publication Number | Publication Date |
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| CN211331743U true CN211331743U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921741240.1U Withdrawn - After Issue CN211331743U (en) | 2019-10-16 | 2019-10-16 | Rectification circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110695503A (en) * | 2019-10-16 | 2020-01-17 | 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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2019
- 2019-10-16 CN CN201921741240.1U patent/CN211331743U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110695503A (en) * | 2019-10-16 | 2020-01-17 | 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 |
| CN110695503B (en) * | 2019-10-16 | 2024-05-28 | 深圳市佳士科技股份有限公司 | Rectifying circuit for inhibiting reverse peak voltage and air plasma cutting machine |
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