CN204392077U - Reinforced lossless absorption circuit - Google Patents
Reinforced lossless absorption circuit Download PDFInfo
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- CN204392077U CN204392077U CN201520113476.6U CN201520113476U CN204392077U CN 204392077 U CN204392077 U CN 204392077U CN 201520113476 U CN201520113476 U CN 201520113476U CN 204392077 U CN204392077 U CN 204392077U
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Abstract
The utility model discloses reinforced lossless absorption circuit, comprise diode rectification unit, the first absorptive unit and the second absorptive unit, wherein, described diode rectification unit is connected to transformer secondary; The due to voltage spikes that described first absorptive unit produces for absorbing parasitic parameter, and the input of this first absorptive unit is connected to the output of described diode rectification unit; Described second absorptive unit is used for realizing peak voltage and absorbs, and the input of this second absorptive unit is connected to the output of the first absorptive unit, output connects load via inductance.Implement reinforced lossless absorption circuit of the present utility model, there is following beneficial effect: by adopting Lossless Snubber mode in high power switching power supply, can effectively reduce and suppress the due to voltage spikes of rectifier diode.
Description
Technical field
The utility model relates to absorbing circuit, more particularly, relates to a kind of reinforced lossless absorption circuit.
Background technology
Switching Power Supply is applied to large-power occasions, adopts the absorbing circuits such as conventional RCD, there is the shortcomings such as absorbing circuit loss is too large.Way conventional at present adopts Lossless Snubber mode;
As shown in Figure 1, Fig. 1 gives a kind of lossless absorption circuit, and the principle of absorption of this circuit is by the stored energy of peak absorbing in Absorption Capacitance, and at secondary freewheeling period, the energy of absorbing circuit electric capacity is delivered to output by inductance again.Simultaneously stability circuit is connected to diode rectifier circuit two ends, and when actual PCB layout, lead-in inductance is less.But the shortcoming of this circuit is that peak restrained effect is poor, and especially when power output is larger, peak restrained is more undesirable.
As shown in Figure 2, Fig. 2 gives another kind of peak restrained circuit, and its operation principle is that the peak voltage on rectifier diode transmits output by Absorption Capacitance and diode, electric capacity own absorption portion of energy simultaneously.At rectifier diode freewheeling period, the energy that electric capacity stores is discharged into output by diode.The advantage of this circuit is that assimilation effect is fine, simple circuit.
But in actual applications, owing to there is distance between each device, namely there is stray inductance, therefore still have certain spike in actual applications.
Utility model content
The technical problem that the utility model solves is, there is peak absorbing effect poor and there is the shortcomings such as spike that parasitic parameter causes cannot suppress, propose a kind of reinforced lossless absorption circuit for existing absorbing circuit.
The utility model solves the technical scheme that its technical problem adopts: a kind of reinforced lossless absorption circuit, comprises diode rectification unit, the first absorptive unit and the second absorptive unit, and wherein, described diode rectification unit is connected to transformer secondary; The due to voltage spikes that described first absorptive unit produces for absorbing parasitic parameter, and the input of this first absorptive unit is connected to the output of described diode rectification unit; Described second absorptive unit is used for realizing peak voltage and absorbs, and the input of this second absorptive unit is connected to the output of the first absorptive unit, output connects load via inductance.
In reinforced lossless absorption circuit of the present utility model, described first absorptive unit comprises the 5th diode, the 6th diode, the 7th diode, the first electric capacity and the second electric capacity; Wherein, described first electric capacity and the 5th Diode series are connected between two outputs of diode rectification unit; Described second electric capacity and the 7th Diode series are connected between two outputs of diode rectification unit; Between the negative electrode that the anode of described 6th diode is connected to the second electric capacity and the 7th diode, between the negative electrode anode that is connected to the 5th diode and the first electric capacity.
In reinforced lossless absorption circuit of the present utility model, described second absorptive unit comprises the 7th diode, the 8th diode, inductance and the second electric capacity; Wherein, described 7th diode and the second capacitances in series are connected between two outputs of diode rectification unit, the first end of described inductance is connected to an output, the second end connection load of diode rectification unit, second end that anode is connected to the tie point of the 7th diode and the second electric capacity, negative electrode is connected to inductance of described 8th diode.
In reinforced lossless absorption circuit of the present utility model, described diode rectification unit comprises the first diode, the second diode, the 3rd diode, the 4th diode, described first diode, the second diode, the 3rd diode, the 4th diode composition bridge rectifier.
In reinforced lossless absorption circuit of the present utility model, the output of described transformer is connected with the input of diode rectification unit.
Implement reinforced lossless absorption circuit of the present utility model, there is following beneficial effect: by adopting Lossless Snubber mode in high power switching power supply, can effectively reduce and suppress the due to voltage spikes of rectifier diode.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is existing conventional lossless absorption circuit schematic diagram;
Fig. 2 is existing conventional peak restrained circuit diagram;
Fig. 3 is the circuit diagram of reinforced lossless absorption circuit embodiment of the present utility model.
Embodiment
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe embodiment of the present utility model in detail.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 3 is the circuit diagram of the reinforced lossless absorption circuit embodiment of the utility model.Reinforced lossless absorption circuit, comprises diode rectification unit 1, first absorptive unit 2 and the second absorptive unit 3, and wherein, diode rectification unit 1 is connected to transformer T1 secondary; The due to voltage spikes that first absorptive unit 2 produces for absorbing parasitic parameter, and the input of this first absorptive unit 2 is connected to the output of described diode rectification unit 1; Described second absorptive unit 3 absorbs for realizing peak voltage, and the input of this second absorptive unit 3 is connected to the output of the first absorptive unit 2, output connects load via inductance L 1.
Above-mentioned first absorptive unit 2 can comprise the 5th diode D5, the 6th diode D6, the 7th diode D7, the first electric capacity C1 and the second electric capacity C2; Wherein: the first electric capacity C1 and the 5th diode D5 is connected in series between two outputs of diode rectification unit 1; Second electric capacity C2 and the 7th diode D7 is connected in series between two outputs of diode rectification unit 1; Between the negative electrode that the anode of the 6th diode D6 is connected to the second electric capacity C2 and the 7th diode D7, negative electrode is connected between the anode of the 5th diode D5 and the first electric capacity C1.In above-mentioned first absorptive unit 2, the peak voltage on diode rectification unit 1 is delivered to output by absorption first electric capacity C1 and the 6th diode D6, and by the first electric capacity C1 own absorption portion of energy; At the freewheeling period of diode rectification unit 1, the energy that the first electric capacity C1 stores is discharged into output by the 5th diode D5.The advantage of this first absorbing circuit 2 is that assimilation effect is fine, simple circuit.
Above-mentioned second absorptive unit 3 can comprise the 7th diode D7, the 8th diode D8, inductance L 1 and the second electric capacity C2; Wherein: the 7th diode D7 and the second electric capacity C2 is connected in series between two outputs of diode rectification unit 1, the first end of inductance L 1 is connected to an output, the second end connection load of diode rectification unit 1, second end that anode is connected to the tie point of the 7th diode D7 and the second electric capacity C2, negative electrode is connected to inductance L 1 of the 8th diode D8.This second absorptive unit 3 is by the stored energy of peak absorbing in the second electric capacity C2, and at the freewheeling period of secondary, the energy of the second electric capacity C2 is delivered to the output of the second absorptive unit 3 again by inductance L 1.Further, because the second absorptive unit 3 is connected to the two ends of diode rectification unit 1, when actual PCB layout, lead-in inductance is less.
In above-mentioned reinforced lossless absorption circuit, diode rectification unit 1 comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, and this first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 form bridge rectifier.
Further, the 7th diode D7, the 8th diode D8 and the second electric capacity C2 form the 3rd absorbing circuit 4, for peak restrained, and good absorbing effect, and solve the poor problem of peak restrained.
In reinforced lossless absorption circuit of the present utility model, the output of described transformer T1 is connected with the input of diode rectification unit 1.
Further, the output of described diode rectification unit 1 and the second electric capacity C2 parallel with one another.
Compared with prior art, implement reinforced lossless absorption circuit of the present utility model, there is following beneficial effect: in high power switching power supply application, consider absorbing circuit loss, usual employing Lossless Snubber mode, lossless absorption circuit of the present utility model effectively can reduce the due to voltage spikes suppressing rectifier diode.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (5)
1. a reinforced lossless absorption circuit, is characterized in that, comprises diode rectification unit, the first absorptive unit and the second absorptive unit, and wherein, described diode rectification unit is connected to transformer secondary; The due to voltage spikes that described first absorptive unit produces for absorbing parasitic parameter, and the input of this first absorptive unit is connected to the output of described diode rectification unit; Described second absorptive unit is used for realizing peak voltage and absorbs, and the input of this second absorptive unit is connected to the output of the first absorptive unit, and output connects load via inductance.
2. reinforced lossless absorption circuit according to claim 1, is characterized in that, described first absorptive unit comprises the 5th diode, the 6th diode, the 7th diode, the first electric capacity and the second electric capacity; Wherein, described first electric capacity and the 5th Diode series are connected between two outputs of diode rectification unit; Described second electric capacity and the 7th Diode series are connected between two outputs of diode rectification unit; Between the negative electrode that the anode of described 6th diode is connected to the second electric capacity and the 7th diode, between the negative electrode anode that is connected to the 5th diode and the first electric capacity.
3. reinforced lossless absorption circuit according to claim 1, is characterized in that, described second absorptive unit comprises the 7th diode, the 8th diode, inductance and the second electric capacity; Wherein, described 7th diode and the second capacitances in series are connected between two outputs of diode rectification unit, the first end of described inductance is connected to an output, the second end connection load of diode rectification unit, second end that anode is connected to the tie point of the 7th diode and the second electric capacity, negative electrode is connected to inductance of described 8th diode.
4. reinforced lossless absorption circuit according to claim 1, it is characterized in that, described diode rectification unit comprises the first diode, the second diode, the 3rd diode, the 4th diode, described first diode, the second diode, the 3rd diode, the 4th diode composition bridge rectifier.
5. reinforced lossless absorption circuit according to claim 1, is characterized in that, the output of described transformer is connected with the input of diode rectification unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520113476.6U CN204392077U (en) | 2015-02-16 | 2015-02-16 | Reinforced lossless absorption circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520113476.6U CN204392077U (en) | 2015-02-16 | 2015-02-16 | Reinforced lossless absorption circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204392077U true CN204392077U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520113476.6U Expired - Fee Related CN204392077U (en) | 2015-02-16 | 2015-02-16 | Reinforced lossless absorption circuit |
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| Country | Link |
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| CN (1) | CN204392077U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207509A (en) * | 2015-10-22 | 2015-12-30 | 北京京仪椿树整流器有限责任公司 | Absorptive L-type four-level Boost circuit |
| WO2018157458A1 (en) * | 2017-02-28 | 2018-09-07 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
-
2015
- 2015-02-16 CN CN201520113476.6U patent/CN204392077U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207509A (en) * | 2015-10-22 | 2015-12-30 | 北京京仪椿树整流器有限责任公司 | Absorptive L-type four-level Boost circuit |
| WO2018157458A1 (en) * | 2017-02-28 | 2018-09-07 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20220216 |
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| CF01 | Termination of patent right due to non-payment of annual fee |