CN103296888A - Full-bridge circuit - Google Patents
Full-bridge circuit Download PDFInfo
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- CN103296888A CN103296888A CN2013100372137A CN201310037213A CN103296888A CN 103296888 A CN103296888 A CN 103296888A CN 2013100372137 A CN2013100372137 A CN 2013100372137A CN 201310037213 A CN201310037213 A CN 201310037213A CN 103296888 A CN103296888 A CN 103296888A
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Abstract
The invention discloses a full-bridge circuit. The full-bridge circuit comprises a primary side circuit, an auxiliary side circuit and a transformer which is connected with the primary side circuit and the auxiliary side circuit, wherein the primary side circuit is formed by enabling two sets of switch tubes which are connected in series to be connected in parallel, intermediate points of the two sets of the switch tubes which are connected in series are respectively connected with a primary end of the transformer, the transformer is provided with two sets of secondary ends, and the auxiliary side circuit is composed of a negative and positive semi-cycle rectifying current and a follow circuit. The full-bridge circuit can eliminate secondary vibrating currents.
Description
Technical field
The present invention relates to the commutation technique field, relate in particular to a kind of full-bridge circuit.
Background technology
Full-bridge circuit is widely used in various power conversion occasions because it is fit to high-power electric energy conversion.Its circuit as shown in Figure 1.This is the full-bridge circuit of the peak-current mode control of a standard, and when constantly becoming big along with power output, it is big that former limit duty ratio also constantly becomes, and former limit duty ratio surpasses after 50%, and it is unstable that system becomes.
As shown in Figure 2, when the duty ratio of Controlled in Current Mode and Based converter surpassed 50%, vibration can appear in converter, unless take the slope compensation measure.If duty ratio surpasses 50%, the rise time of inductive current (t0-t1), downslope time (t1-t2) was just less than 50% of one-period so just greater than 50% of the whole cycle.In the short period of time, the outputting inductance electric current does not also have enough time to get back to static initial value (zero current), next cycle and having begun.Namely after one-period finished, the outputting inductance electric current was not got back to zero current, is referred to as the inductive current continuous state.At this moment, if there is disturbance to produce a little Δ I, dotted line among the figure, because control mode is peak-current mode, vibrating appears the Δ I of this disturbance in the big and little mode of one-period with the interval one-period.
As shown in Figure 3, at this problem, slope compensation is the signal (m3) of a fixed ramp of superposition on electric current basically.Reduce the effect of Δ I artificially, the influence of current closed-loop can better be suppressed.In fact, the real effect of slope compensation is that control ring is more controlled as voltage mode.Can understand like this: voltage mode control is to compare with the sawtooth waveforms of fixed ramp and the output of error amplifier, when so the elected slope that adds is increasing, converter is just more and more controlled as voltage mode, when the ratio of the amplitude of slope compensation and current signal amplitude is tending towards infinity, just become voltage mode control fully.Just now saying can obtain explaining too: Controlled in Current Mode and Based has just become voltage mode control during the power supply underloading.
Adopt the problem of slope compensation to be that compensation is many at present, voltage system, compensation is not enough, and concussion still exists.In actual the use, we find that (even if same model) be the offset difference of every machine almost, and same machine offset when different voltage is all different.Namely be difficult to find the The optimal compensation point.
Summary of the invention
The present invention avoids the weak point that exists in the above-mentioned prior art, and a kind of full-bridge circuit is provided.
The present invention be the technical solution problem by the following technical solutions, a kind of full-bridge circuit, comprise former limit circuit, secondary circuit and the transformer that is connected former limit circuit and secondary circuit, described former limit circuit is formed in parallel by the switching tube of two groups of series connection, the intermediate point of two groups of tandem tap pipes connects the primary side of transformer respectively, transformer has two groups of secondary ends, and secondary circuit is made of positive-negative half-cycle rectification and afterflow.
Further, as a kind of preferred, the corresponding positive half cycle rectification of described secondary circuit and freewheeling circuit are made of first and second diodes, first inductance and load capacitance, wherein first group of secondary in-phase end of the positive pole of first diode and transformer links to each other, the negative pole of first diode links to each other by the positive pole of first inductance and output, the negative pole of first diode links to each other with the negative pole of second diode, and the positive pole of second diode links to each other with negative pole of output end, and load capacitance is connected in parallel on output.
Further, as a kind of preferred, the corresponding negative half period rectification of described secondary circuit and freewheeling circuit are made of third and fourth diode, second inductance and load capacitance, wherein second group of secondary end of oppisite phase of the positive pole of the 3rd diode and transformer links to each other, the negative pole of the 3rd diode links to each other by the positive pole of second inductance and output, the negative pole of the 3rd diode links to each other with the negative pole of the 4th diode, and the positive pole of the 4th diode links to each other with negative pole of output end, and load capacitance is connected in parallel on output.
Further, as a kind of preferred, the described transformer first and second secondary winding numbers are identical.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention makes that by two positive-negative half-cycle rectification circuits that separate the outputting inductance electric current is discontinuous, so system can not produce secondary concussion electric current.
Description of drawings
Fig. 1 is full-bridge circuit schematic diagram in the prior art.
Fig. 2 is electric current output waveform schematic diagram in the prior art.
Fig. 3 is compensation waveform schematic diagram in the prior art.
Fig. 4 is embodiment of the invention full-bridge circuit schematic diagram.
Below pass through embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment
Referring to Fig. 4, a kind of full-bridge circuit, comprise former limit circuit, secondary circuit and be connected the transformer T1 of former limit circuit and secondary circuit, described former limit circuit is by two groups of series connection (Q1 and Q2 series connection, Q3 and Q4 series connection) switching tube is formed in parallel, the intermediate point of two groups of tandem tap pipes connects the primary side of transformer T1 respectively, and transformer T1 has two groups of secondary ends, and secondary circuit is made of positive-negative half-cycle rectification and afterflow.The corresponding positive half cycle rectification of described secondary circuit and freewheeling circuit are made of the first diode D1 and the second diode D2, first inductance L 1 and load capacitance C1, wherein first group of secondary in-phase end of the positive pole of the first diode D1 and transformer T1 links to each other, the negative pole of the first diode D1 links to each other by the positive pole of first inductance L 1 and output, the negative pole of the first diode D1 links to each other with the negative pole of the second diode D2, the positive pole of the second diode D2 links to each other with negative pole of output end, and load capacitance C1 is connected in parallel on output.The corresponding negative half period rectification of described secondary circuit and freewheeling circuit are made of the 3rd diode D3 and the 4th diode D4, second inductance L 2 and load capacitance C1, wherein second group of secondary end of oppisite phase of the positive pole of the 3rd diode D3 and transformer T1 links to each other, the negative pole of the 3rd diode D3 links to each other by the positive pole of second inductance L 2 and output, the negative pole of the 3rd diode D3 links to each other with the negative pole of the 4th diode D4, the positive pole of the 4th diode D4 links to each other with negative pole of output end, and load capacitance C1 is connected in parallel on output.
Former limit of the present invention is identical with traditional circuit, and secondary branch positive-negative half-cycle is separated rectification and afterflow.
In the production process, to the unusual headache of compensation problem.Consider the reason that resonance current produces, be exactly to be that the electric current of outputting inductance is continuous in fact, when the outputting inductance electric current is discontinuous, small sample perturbations in the previous cycle can be to a back cycle electric current generation effect, and the inductive current consecutive hours, disturbance in the previous cycle exerts an influence to a back cycle, and then forms concussion.To fundamentally solve this secondary concussion, should start with discontinuous this root problem continuously from the outputting inductance electric current.So adopt the output positive-negative half-cycle 2 tunnel identical output circuits (A and B) to carry out rectification and afterflow (output of output topological sum normal shock is identical) respectively.When transformer output positive half cycle current, the work of A road, B road work when transformer is exported secondary half cycle.Identical because of 2 road circuit, now only analyze the A road course of work.When transformer output positive half cycle current, D1 is in on-state, and D2 is off-state, and the electric current of inductance L 1 increases gradually, and after transformer output positive half cycle current finished, D1 turn-offed, and inductance L 1 is passed through the D2 afterflow, the D2 conducting, and inductance L 1 demagnetization resets, and electric current drops to 0.When secondary half cycle, the work of B road is identical, no longer replicate analysis.Originally be an outputting inductance, be separated into 2 inductance of positive-negative half-cycle now, each inductance operating frequency is half of full-bridge frequency, because full-bridge major loop duty ratio all the time (necessary) less than 100%, the duty ratio that outputs to each inductance so is lower than 50%, in other words, is exactly that inductive current can not be continuously, therefore in my invention, system can not produce secondary concussion electric current.
That our actual product is maximum is 60V80A, and as example, circuit parameter is calculated as follows: full-bridge 32KHz, and main transformer source limit 32T, secondary output voltage 60V, coil-induced voltage should be ignored loss herein at 120V(), secondary 12T, outputting inductance 12-18uH.
By above-mentioned description, the related personnel can change and revise under the condition of mentality of designing of the present invention and technical indicator appointment.Technical scope of the present invention is not limited to the content on the specification, must determine technical scope according to the claim scope.The corresponding negative half period rectification of described secondary circuit and freewheeling circuit are made of third and fourth diode, second inductance and load capacitance, wherein second group of secondary end of oppisite phase of the positive pole of the 3rd diode and transformer links to each other, the negative pole of the 3rd diode links to each other by the positive pole of second inductance and output, the negative pole of the 3rd diode links to each other with the negative pole of the 4th diode, the positive pole of the 4th diode links to each other with negative pole of output end, and load capacitance is connected in parallel on output.
Claims (4)
1. full-bridge circuit, it is characterized in that: comprise former limit circuit, secondary circuit and the transformer that is connected former limit circuit and secondary circuit, described former limit circuit is formed in parallel by the switching tube of two groups of series connection, the intermediate point of two groups of tandem tap pipes connects the primary side of transformer respectively, transformer has two groups of secondary ends, and secondary circuit is made of positive-negative half-cycle rectification and afterflow.
2. full-bridge circuit according to claim 1, it is characterized in that: the corresponding positive half cycle rectification of described secondary circuit and freewheeling circuit are made of first and second diodes, first inductance and load capacitance, wherein first group of secondary in-phase end of the positive pole of first diode and transformer links to each other, the negative pole of first diode links to each other by the positive pole of first inductance and output, the negative pole of first diode links to each other with the negative pole of second diode, the positive pole of second diode links to each other with negative pole of output end, and load capacitance is connected in parallel on output.
3. as full-bridge circuit as described in the claim 2, it is characterized in that: the corresponding negative half period rectification of described secondary circuit and freewheeling circuit are made of third and fourth diode, second inductance and load capacitance, wherein second group of secondary end of oppisite phase of the positive pole of the 3rd diode and transformer links to each other, the negative pole of the 3rd diode links to each other by the positive pole of second inductance and output, the negative pole of the 3rd diode links to each other with the negative pole of the 4th diode, the positive pole of the 4th diode links to each other with negative pole of output end, and load capacitance is connected in parallel on output.
4. as full-bridge circuit as described in the claim 3, it is characterized in that: the described transformer first and second secondary winding numbers are identical.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100372137A CN103296888A (en) | 2013-01-31 | 2013-01-31 | Full-bridge circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100372137A CN103296888A (en) | 2013-01-31 | 2013-01-31 | Full-bridge circuit |
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| CN103296888A true CN103296888A (en) | 2013-09-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735691A (en) * | 2017-03-13 | 2017-05-31 | 成都信息工程大学 | A kind of molten tin device |
| CN111446865A (en) * | 2020-05-08 | 2020-07-24 | 深圳威迈斯新能源股份有限公司 | Slope compensation control circuit and slope compensation control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1212497A (en) * | 1997-09-23 | 1999-03-31 | 朗迅科技公司 | Power converter having multiple output voltage capability and method of operation thereof |
| US20030038612A1 (en) * | 2001-08-21 | 2003-02-27 | Kutkut Nasser H. | High voltage battery charger |
| CN102611318A (en) * | 2012-04-16 | 2012-07-25 | 唐山电动车研发与检测有限公司 | Continuous adjustable power supply with variable structure and constant power |
-
2013
- 2013-01-31 CN CN2013100372137A patent/CN103296888A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1212497A (en) * | 1997-09-23 | 1999-03-31 | 朗迅科技公司 | Power converter having multiple output voltage capability and method of operation thereof |
| US20030038612A1 (en) * | 2001-08-21 | 2003-02-27 | Kutkut Nasser H. | High voltage battery charger |
| CN102611318A (en) * | 2012-04-16 | 2012-07-25 | 唐山电动车研发与检测有限公司 | Continuous adjustable power supply with variable structure and constant power |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735691A (en) * | 2017-03-13 | 2017-05-31 | 成都信息工程大学 | A kind of molten tin device |
| CN106735691B (en) * | 2017-03-13 | 2022-11-08 | 成都信息工程大学 | Tin melting device |
| CN111446865A (en) * | 2020-05-08 | 2020-07-24 | 深圳威迈斯新能源股份有限公司 | Slope compensation control circuit and slope compensation control method |
| CN111446865B (en) * | 2020-05-08 | 2021-06-25 | 深圳威迈斯新能源股份有限公司 | Slope compensation control circuit and slope compensation control method |
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Application publication date: 20130911 |