CN202455265U - Buck type conversion circuit - Google Patents
Buck type conversion circuit Download PDFInfo
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- CN202455265U CN202455265U CN201220027622XU CN201220027622U CN202455265U CN 202455265 U CN202455265 U CN 202455265U CN 201220027622X U CN201220027622X U CN 201220027622XU CN 201220027622 U CN201220027622 U CN 201220027622U CN 202455265 U CN202455265 U CN 202455265U
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- conversion circuit
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Abstract
The utility model discloses a buck type conversion circuit, comprising a direct current power supply source Vin, a switching device Q2, a diode D2, a capacitor C2 and a load R2. The buck type conversion circuit is characterized by also comprising an induction transformer L2, wherein the switching device Q2 is connected with the direct current power supply source; the other end is connected with the induction transformer L2; the cathode of the diode D2 is connected to the common terminal of the induction transformer L2; and the capacitor C2 and the load are connected in parallel to the other end of the induction transformer L2. The buck type conversion circuit can improve the working efficiency of the circuit, reduce damages to the switching device, and decrease the cost of the circuit.
Description
Technical field
the utility model belongs to power electronic technology and switch power technology field, is specifically related to a kind of buck translation circuit.
Background technology
buck translation circuit is that the Buck circuit is a kind of of DC voltage conversion circuit, can realize that high voltage arrives the conversion of low-voltage, is widely used at electric and electronic technical field and switch power technology field.As shown in Figure 1, the Buck circuit mainly comprises switching device Q1, diode D1, inductance L 1, capacitor C 1, load R1; Q1 is connected in the input circuit, input termination DC power supply, output termination inductance one end.When switching device Q1 conducting, diode D1 ends, and input voltage transmits energy to inductance L 1, energy is provided for simultaneously capacitor C 1 and load R1; When derailing switch Q1 turn-offs, diode D1 conducting, inductance provides energy to load, constitutes the loop through diode continuousing flow.This Buck circuit structure is simple, but has only the energy of [(Vin-Vo)/Vin] % to transmit through inductance L 1.When input voltage was higher, the rated voltage of diode D1 was also very high, and the conduction voltage drop of diode is also very high, so have than higher loss; (D=Vout/Vin) very little makes the switching loss of switching device higher to the duty ratio that drive circuit provides, and the line loss on the inductance L 1 is very big, and the conversion efficiency of entire circuit is lower.
Summary of the invention
the utility model purpose is: a kind of new Buck circuit is provided, the conversion efficiency of entire circuit is improved, the loss of switching device is lower, and the caloric value of switching device diminishes, and improves the useful life of circuit.
for realizing above-mentioned purpose, the utility model circuit has adopted a kind of new Buck circuit: comprise DC power supply Vin, switching device Q2, inductive transformer L2, diode D2, capacitor C 2, load R2; Switching device Q2 and DC power supply join, another termination inductive transformer, and diode D2 negative electrode is received the common port of inductive transformer, and electric capacity and load are also received the other end of inductive transformer.The main distinction of this practical circuit and existing Buck circuit is: new-type circuit has increased inductive transformer, and the no-load voltage ratio through N1 and N2 makes that the loss of switching device, inductance is lower, and caloric value is littler.
the utility model has the advantages that: can improve the operating efficiency of circuit, reduce the loss of switching device, reduce the cost of circuit.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Fig. 1 is existing Buck circuit.
The Buck circuit of
Fig. 2 the utility model.
Operating state when
Fig. 3 is the Buck contactor device Q2 conducting of the utility model.
Fig. 4 is the operating state of the Buck circuit Q2 of the utility model when closing section.
Embodiment
embodiment: Buck circuit as shown in Figure 2: comprise DC power supply Vin, switching device Q2, inductive transformer L2, diode D2, capacitor C 2, load R2; Switching device Q2 and DC power supply join, another termination inductive transformer, and diode D2 negative electrode is received the common port of inductive transformer, and electric capacity and load are also received the other end of inductive transformer.The utility model circuit working process is following: when switching device Q2 conducting, diode D2 ends, and input voltage transmits energy to inductance L 2, energy is provided for simultaneously capacitor C 1 and load R2, and is as shown in Figure 3.When switching device Q2 turn-offs, diode D2 conducting, the coil N2 of inductance constitutes continuous current circuit to load discharge through diode D2, and the voltage induced on the coil N1 also powers to the load to coil N2 simultaneously, and is as shown in Figure 4.The main distinction of this practical circuit and existing Buck circuit is: the circuit of the utility model has increased inductive transformer, and the no-load voltage ratio through N1 and N2 makes that the loss of switching device, inductance is lower, and caloric value is littler.Switching device Q2 duty ratio D=N2/N1.The rated voltage of diode is the * N2/ (N1+N2) of V=Vout+(Vin-Vout).
the foregoing description certainly only are the technical conceive and the characteristics of explanation the utility model; Its purpose is to let the people who is familiar with this technology can understand content of the utility model and enforcement according to this, can not limit the protection range of utility model with this.All modifications of doing according to the spirit of the utility model main technical schemes all should be encompassed within the protection range of the utility model.
Claims (1)
1. buck translation circuit; Comprise DC power supply Vin, switching device Q2, diode D2, capacitor C 2, load R2, it is characterized in that, also comprise inductive transformer L2; Switching device Q2 and DC power supply join; Another termination inductive transformer L2, diode D2 negative electrode is received the common port of inductive transformer L2, and capacitor C 2 and load are also received the other end of inductive transformer L2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220027622XU CN202455265U (en) | 2012-01-20 | 2012-01-20 | Buck type conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220027622XU CN202455265U (en) | 2012-01-20 | 2012-01-20 | Buck type conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202455265U true CN202455265U (en) | 2012-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220027622XU Expired - Fee Related CN202455265U (en) | 2012-01-20 | 2012-01-20 | Buck type conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202455265U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682708A (en) * | 2013-11-29 | 2015-06-03 | 华为技术有限公司 | Buck converter |
| CN108319355A (en) * | 2018-01-26 | 2018-07-24 | 郑州云海信息技术有限公司 | A kind of Buck framework power supply circuits improving power supply light-load efficiency |
-
2012
- 2012-01-20 CN CN201220027622XU patent/CN202455265U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682708A (en) * | 2013-11-29 | 2015-06-03 | 华为技术有限公司 | Buck converter |
| CN108319355A (en) * | 2018-01-26 | 2018-07-24 | 郑州云海信息技术有限公司 | A kind of Buck framework power supply circuits improving power supply light-load efficiency |
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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: 20120926 Termination date: 20200120 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |