CN101412139A - Inversion welding source under finite both positive control mode - Google Patents
Inversion welding source under finite both positive control mode Download PDFInfo
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- CN101412139A CN101412139A CNA200810236148XA CN200810236148A CN101412139A CN 101412139 A CN101412139 A CN 101412139A CN A200810236148X A CNA200810236148X A CN A200810236148XA CN 200810236148 A CN200810236148 A CN 200810236148A CN 101412139 A CN101412139 A CN 101412139A
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- invert
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Abstract
The invention discloses an invert welding source under limited bipolar control model. Q1 and Q3 in a main circuit of the invert welding source are high-power switching tubes of a leading leg; Q2 and Q4 are high-power switching tubes of a lagging leg; from a diode D1 to a diode D4 are internal inverse parallel diodes corresponding to the high-power switching tubes respectively; a capacitor C1 and capacitor C2 are parallel capacitors of the high-power switching tubes of the leading leg; a midpoint of the leading leg is in equivalent leakage inductance connection with a primary side of an intermediate frequency transformer through a stopping condenser, a saturated inductance and a transformer which are connected in series, and is connected with a midpoint of the lagging leg; and a secondary side of the intermediate frequency transformer is connected with an output filter inductance, after the secondary side of the intermediate frequency transformer is connected with a full-wave rectification diode in parallel. The invention leads a main circuit of the invert welding source to default an auxiliary inductance of the primary side or the secondary side of a main transformer and the capacitor connected with the high-power switching tubes of the lagging leg in parallel, thereby reducing the production cost of the invert welding source, improving working reliability and stability of the invert welding source, and reducing power consumption of the invert welding source.
Description
Technical field
What the present invention relates to is a kind of inversion welding source that is used for electric welding machine, relates in particular to full-bridge zero-voltage, Zero Current Switch pulsewidth modulation (FB-ZVZCS-PWM) inversion welding source main circuit under finite both positive control mode.
Background technology
At present, soft switching inverter adopts full-bridge phase shifting formula Zero-voltage soft switch pulsewidth modulation (FB-ZVS-PWM) pattern more, ZVT with the high-power switch tube of realizing leading arm, lagging leg, when underloading and zero load, the FB-ZVS-PWM pattern is difficult to realize the ZVT of lagging leg high-power switch tube.Because inversion welding source operating mode complexity, load may be under short circuit-heavy duty-underloading-Light Condition frequent changes, when loading on zero load or underloading, the lagging leg high-power switch tube will lose the condition of ZVT.Under all loading conditions, realize ZVT in order to make the lagging leg high-power switch tube, the scheme that adopts as shown in Figure 1 at present, on the former limit of main transformer or secondary increase an auxiliary induction, cause the transformer primary current to increase, thereby expand the loading range of realizing ZVT.The defective that such scheme exists is: (1) has just increased the manufacturing cost of inversion welding source owing to increased an auxiliary induction in the main circuit; (2) auxiliary induction burns out because of overload often; (3) auxiliary induction has increased the power consumption of inversion welding source.
Summary of the invention
The objective of the invention is to have proposed a kind of full-bridge zero-voltage, Zero Current Switch pulsewidth modulation inversion welding source that adopts under the finite both positive control mode at the deficiency of the full-bridge zero-voltage switch pulsewidth modulation inversion welding source under the phase shifting control pattern of the prior art owing to increase auxiliary induction in the main circuit.
The technical solution used in the present invention is: Q1 and Q3 are the high-power switch tube of leading arm in its main circuit, Q2 and Q4 are the high-power switch tube of lagging leg, diode D1 to D4 is respectively the inner counter of corresponding high-power switch tube to parallel diode, capacitor C 1 and C2 are respectively the shunt capacitance of leading arm high-power switch tube, the mid point of leading arm is passed through successively the capacitance of series connection, pulsactor and transformer equivalence leakage inductance is connected the mid point that connects lagging leg behind the former limit of intermediate-frequency transformer, connects output inductor again behind the secondary parallel connection full-wave rectification diode of intermediate-frequency transformer.
Advantage of the present invention is:
(1) the present invention make the inversion welding source main circuit default the former limit of main transformer or the auxiliary induction of secondary and the electric capacity of lagging leg high-power switch tube parallel connection, reduced the manufacturing cost of inversion welding source.
(2) the present invention make the inversion welding source main circuit default the auxiliary induction of the former limit of main transformer or secondary, the situation that does not exist auxiliary induction to burn has improved the reliability and stability of welding machine work.
(3) the present invention make the inversion welding source main circuit default the auxiliary induction of the former limit of main transformer or secondary, do not have the heating or the temperature rise of auxiliary induction, reduced the power consumption of inversion welding source.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 be in the background technology under the phase shifting control pattern FB-ZVS-PWM inversion welding source main circuit diagram.
Fig. 2 is a main circuit diagram of the present invention.
The specific embodiment
As shown in Figure 2, the Q1 in the main circuit, Q2, Q3, Q4 are high-power switch tube IGBT, and wherein leading arm high-power switch tube Q1, Q3 adopt ZVT (ZVS), and lagging leg high-power switch tube Q2, Q4 adopt Zero Current Switch (ZCS).Diode D1～D4 is respectively the inside backward dioded of high-power switch tube Q1～Q4 correspondence, and capacitor C 1, C2 are respectively the electric capacity of Q1, Q3 parallel connection.The present invention is with respect to FB-ZVS-PWM inversion welding source under the phase shifting control pattern, and its obvious characteristics is the default former limit of main transformer or the auxiliary induction of secondary and the electric capacity of lagging leg high-power switch tube parallel connection in the inversion welding source main circuit.
Capacitance Cb, pulsactor Lr by series connection is connected the mid point that connects lagging leg behind the former limit of intermediate-frequency transformer T1 with transformer equivalence leakage inductance Lk successively with the mid point of leading arm, connects output inductor L again behind secondary parallel connection full-wave rectification diode D5, the D6 of intermediate-frequency transformer T1.
In the FB-ZVZCS-PWM inverter main circuit under finite both positive control mode, the condition of leading arm high-power switch tube ZVT is:
(DT)/2+t
1<T/2 (1)
The condition of lagging leg high-power switch tube Zero Current Switch (ZCS) is:
(DT)/2+t
1+t
2<T/2 (2)
Wherein, t
1=2C
1U
m/ i
pBe C
1, C
2Discharge and recharge the time; t
2=4L
kC
b/ DT decays to for zero time for primary side circulation; i
pBe primary current; D is a dutycycle; T is a switch periods; L
kBe main transformer equivalence leakage inductance; C
bBe capacitance.
By formula (1), (2) as can be known, if can realize lagging leg high-power switch tube Zero Current Switch, leading arm high-power switch tube ZVT is also realized surely with regard to one, so the FB-ZVZCS-PWM inverter main circuit mainly is a Zero Current Switch of realizing the lagging leg high-power switch tube.In the formula (2), dutycycle D, switch periods T, primary side circulation t die-away time
2Irrelevant with the size of primary current; t
1Can pass through not quite, fully dutycycle D, primary side circulation t die-away time
2Control reserve enough allowances and give t
1Thereby, can in arbitrary load and change range of input voltage, realize the Zero Current Switch of lagging leg.Under the FB-ZVS-PWM pattern in the inversion welding source main circuit topology, increase auxiliary induction and be in order to improve transformer primary current value in underloading or when unloaded, make lagging leg realize ZVT like this.Under the FB-ZVZCS-PWM pattern, in the inversion welding source main circuit topology, can pass through dutycycle D, primary side circulation t die-away time
2Control the condition of lagging leg Zero Current Switch, the circulation energy that does not need auxiliary induction to provide are provided.
Have no progeny in a high-power switch tube IGBT pass at leading arm, main circuit enters the nature commutation course, primary current I
pAt capacitance C
bEffect under reduce gradually, work as I
pWhen being reduced to zero, because the effect of saturable reactor has stoped by V
CbpThe reverse direction current flow that causes, thus the shutoff of lagging leg is finished under zero current condition.Another IGBT's is open-minded on the lagging leg subsequently, mainly due to the effect of saturable reactor, promptly works as V
InWith V
CbpSum is added on the saturable reactor, and saturable reactor withdraws from and saturatedly will experience an of short duration process, and electric current can not rise at once, and opening under zero current of lagging leg finished like this.
The principle of resonant element capacitance Cb, pulsactor Lr parameter value is, should satisfy two key factors of the soft switch of lagging leg, obtains peak efficiency again.The heat radiation of saturable reactor and loss are one of problems of this type of circuit maximum, in Practical Calculation, should determine saturable reactor at first, as with squareness ratio cobalt-based material and pulsactor Lr voltagesecond product is controlled at about 40～120 μ VS preferably, saturated inductance voltagesecond product value is 80 μ VS in this routine circuit.By appropriate design, the loss of pulsactor Lr is also little.After the value of pulsactor Lr was tentatively selected, just the heap(ed) capacity that can obtain capacitance Cb according to conventional formula was 7.7 μ F.
Claims (2)
1, inversion welding source under a kind of finite both positive control mode, high-power switch tube (Q1 in its main circuit, Q3) be leading arm, high-power switch tube (Q2, Q4) be lagging leg, (D1～D4) is respectively high-power switch tube, and (inner counter of Q1～Q4) corresponding is to parallel diode for diode, electric capacity (C1, C2) be high-power switch tube (Q1 respectively, Q3) shunt capacitance, it is characterized in that: the capacitance (Cb) that the mid point of leading arm is passed through successively series connection, pulsactor (Lr) is connected the mid point that connects lagging leg behind the former limit of intermediate-frequency transformer (T1), the secondary of intermediate-frequency transformer (T1) full-wave rectification diode in parallel (D5 with transformer leakage inductance (Lk), D6) connect output inductor (L) after again.
2, the inversion welding source under a kind of finite both positive control mode according to claim 1 is characterized in that: the voltagesecond product of described pulsactor (Lr) is 40～120 μ VS, and the heap(ed) capacity of capacitance (Cb) is 7.7 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810236148XA CN101412139A (en) | 2008-11-17 | 2008-11-17 | Inversion welding source under finite both positive control mode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810236148XA CN101412139A (en) | 2008-11-17 | 2008-11-17 | Inversion welding source under finite both positive control mode |
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| CN101412139A true CN101412139A (en) | 2009-04-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829834A (en) * | 2010-04-15 | 2010-09-15 | 江苏科技大学 | Full-bridge inverting and single end forward inverting switching type arc welding power supply and control method thereof |
| CN101628356B (en) * | 2009-08-06 | 2012-05-30 | 唐山松下产业机器有限公司 | Soft-switching inversion welder |
| CN102784999A (en) * | 2012-08-31 | 2012-11-21 | 苏州市双马机电有限公司 | Two-transistor forward soft-switching inverter manual electric arc welder |
| CN103418892A (en) * | 2013-07-18 | 2013-12-04 | 北京工业大学 | Welding source device with energy keeping loop and control method |
-
2008
- 2008-11-17 CN CNA200810236148XA patent/CN101412139A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101628356B (en) * | 2009-08-06 | 2012-05-30 | 唐山松下产业机器有限公司 | Soft-switching inversion welder |
| CN101829834A (en) * | 2010-04-15 | 2010-09-15 | 江苏科技大学 | Full-bridge inverting and single end forward inverting switching type arc welding power supply and control method thereof |
| CN101829834B (en) * | 2010-04-15 | 2013-06-05 | 江苏科技大学 | Full-bridge inverting and single end forward inverting switching type arc welding power supply and control method thereof |
| CN102784999A (en) * | 2012-08-31 | 2012-11-21 | 苏州市双马机电有限公司 | Two-transistor forward soft-switching inverter manual electric arc welder |
| CN103418892A (en) * | 2013-07-18 | 2013-12-04 | 北京工业大学 | Welding source device with energy keeping loop and control method |
| CN103418892B (en) * | 2013-07-18 | 2015-09-02 | 北京工业大学 | A kind of welding supply and control method that there is energy and keep loop |
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Open date: 20090422 |