CN204205959U - A kind of DC-DC power source converter circuit - Google Patents
A kind of DC-DC power source converter circuit Download PDFInfo
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- CN204205959U CN204205959U CN201420689073.1U CN201420689073U CN204205959U CN 204205959 U CN204205959 U CN 204205959U CN 201420689073 U CN201420689073 U CN 201420689073U CN 204205959 U CN204205959 U CN 204205959U
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Abstract
The utility model relates to a kind of DC-DC power source converter circuit.The utility model comprises reduction voltage circuit, control circuit, start-up circuit and filter circuit, reduction voltage circuit is by transformer T1 and T2 twice transformation, realize the transfer process of DC-DC, fall control circuit and adopt peak current mode double-loop control mode, namely in voltage close loop control system, peak current FEEDBACK CONTROL is added, start-up circuit starts whole DC-DC change-over circuit by the break-make of Mos pipe, the mixed and disorderly voltage signal that filter circuit elimination is unnecessary.The utility model reduces the volume and weight of power-switching circuit, due to chip UC3845A good stability and the market price is lower, at underloading and fully loaded lower all energy reliability service, by changing resistance R14 resistance, diode D7 withstand voltage and electric capacity C9 capacitance, output voltage Ui can be made to be arbitrary value between 0 ~ 48V, to adopt the power supply changeover device of this kind of circuit to reduce cost under the prerequisite ensureing stability.
Description
Technical field
The utility model relates to a kind of power circuit, specifically a kind of DC-DC power source converter circuit.
Background technology
Along with the development of power electronic technology, the work of power electronic equipment and people, the relation of life are day by day close, and electronic equipment all be unable to do without reliably power supply.DC-DC power source converter circuit utilizes modern power electronics technology, the time ratio of control switch transistor ON and shutoff, maintains a kind of power supply of regulated output voltage.DC-DC power source transducer high frequency is the direction of its development, and high frequency makes DC-DC power source transducer enter application widely, particularly in the application of high-technology field, has promoted the miniaturization of new high-tech product, lighting.How guarantee is stable export while, reduce DC-DC power source transducer volume, alleviate its weight, become the direction of research in industry.
Summary of the invention
The purpose of this utility model is to provide that a kind of volume is little, lightweight, output voltage ripple is little and good stability DC-DC power source converter circuit, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of DC-DC power source converter circuit, comprise reduction voltage circuit, control circuit, start-up circuit and filter circuit, described reduction voltage circuit is by twice transformation of transformer T1 and transformer T2, realize the transfer process of DC-DC, reduction voltage circuit comprises transformer T1, transformer T2 and resistance R4, described control circuit adopts peak current mode double-loop control mode, namely in voltage close loop control system, peak current FEEDBACK CONTROL is added, control circuit comprises chip IC, electric capacity C6 and resistance R2, described start-up circuit starts whole DC-DC change-over circuit by the break-make of Mos pipe, start-up circuit comprises Mos pipe, diode D2 and resistance R1, the mixed and disorderly voltage signal that described filter circuit elimination is unnecessary, filter circuit comprises capacity earth C1 and ground capacity C2.
The described ground capacity C1 other end connects ground connection diode D1 negative pole respectively, ground capacity C2, diode D2 positive pole, Mos pipe D pole and input Uo, diode D2 negative pole contact resistance R1, the resistance R1 other end connects ground capacity C2 respectively, ground capacity C3, resistance R14 and chip IC port 2, chip IC port one connects ground capacity C4 and resistance R2 respectively, chip IC port 3 connects electric capacity C5, electric capacity C5 other end connection transformer T1 secondary, transformer T1 secondary other end ground connection, chip IC port 4 ground connection, chip IC port 5 is the contact resistance R2 other end and ground capacity C8 respectively, chip IC port 6 is contact resistance R9 and ground capacity C7 respectively, chip IC port 7 connects electric capacity C6 respectively, resistance R3 and resistance R10, chip IC port 8 connects the electric capacity C6 other end and the resistance R3 other end respectively, the described resistance R10 other end connects earth resistance R11 respectively, resistance R12 and resistance R13, the described resistance R14 other end connects diode D6 negative pole, diode D6 positive pole is the contact resistance R12 other end respectively, the resistance R13 other end, inductance L, diode D7, electric capacity C9 and output Ui, the inductance L other end connects ground connection diode D4 negative pole respectively, ground connection diode D5 negative pole and transformer T2 secondary, one end, transformer T2 former limit ground connection, the transformer T2 former limit other end connects earth resistance R6 and diode D3 positive pole respectively, diode D3 negative pole connects earth resistance R7 respectively, earth resistance R8 and the resistance R9 other end, the described transformer T2 secondary other end is contact resistance R5 respectively, Mos pipe S pole and the former limit of transformer T1, the transformer T1 former limit other end is contact resistance R4 and the resistance R5 other end respectively, the resistance R4 other end connects Mos pipe G pole.
As further program of the utility model: described chip IC model is UC3845A.
As the utility model further scheme: also comprise triode D4 and triode D5, triode D4 and triode D5 carries out clamp and absorption to peak voltage.
As the utility model further scheme: the output voltage values Ui of described DC-DC power source converter circuit is determined by resistance R14 resistance, diode D7 withstand voltage and electric capacity C9 capacitance.
Compared with prior art, the beneficial effects of the utility model are: the utility model is by using chip UC3845A, reduce the volume and weight of power-switching circuit, due to chip UC3845A good stability and the market price is lower, at underloading and fully loaded lower all energy reliability service, by changing resistance R14 resistance, diode D7 withstand voltage and electric capacity C9 capacitance, output voltage Ui can be made to be arbitrary value between 0 ~ 48V, to adopt the power supply changeover device of this kind of circuit to reduce cost under the prerequisite ensureing stability.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of DC-DC power source converter circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of DC-DC power source converter circuit, comprise reduction voltage circuit, control circuit, start-up circuit and filter circuit, reduction voltage circuit is by twice transformation of transformer T1 and transformer T2, realize the transfer process of DC-DC, reduction voltage circuit comprises transformer T1, transformer T2 and resistance R4, control circuit adopts peak current mode double-loop control mode, namely in voltage close loop control system, peak current FEEDBACK CONTROL is added, control circuit comprises chip IC, electric capacity C6 and resistance R2, start-up circuit starts whole DC-DC change-over circuit by the break-make of Mos pipe, start-up circuit comprises Mos pipe, diode D2 and resistance R1, the mixed and disorderly voltage signal that filter circuit elimination is unnecessary, filter circuit comprises ground capacity C1 and ground capacity C2.
The ground capacity C1 other end connects ground connection diode D1 negative pole respectively, ground capacity C2, diode D2 positive pole, Mos pipe D pole and input Uo, diode D2 negative pole contact resistance R1, the resistance R1 other end connects ground capacity C2 respectively, ground capacity C3, resistance R14 and chip IC port 2, chip IC port one connects ground capacity C4 and resistance R2 respectively, chip IC port 3 connects electric capacity C5, electric capacity C5 other end connection transformer T1 secondary, transformer T1 secondary other end ground connection, chip IC port 4 ground connection, chip IC port 5 is the contact resistance R2 other end and ground capacity C8 respectively, chip IC port 6 is contact resistance R9 and ground capacity C7 respectively, chip IC port 7 connects electric capacity C6 respectively, resistance R3 and resistance R10, chip IC port 8 connects the electric capacity C6 other end and the resistance R3 other end respectively, the resistance R10 other end connects earth resistance R11 respectively, resistance R12 and resistance R13, the resistance R14 other end connects diode D6 negative pole, diode D6 positive pole is the contact resistance R12 other end respectively, the resistance R13 other end, inductance L, diode D7, electric capacity C9 and output Ui, the inductance L other end connects ground connection diode D4 negative pole respectively, ground connection diode D5 negative pole and transformer T2 secondary, one end, transformer T2 former limit ground connection, the transformer T2 former limit other end connects earth resistance R6 and diode D3 positive pole respectively, diode D3 negative pole connects earth resistance R7 respectively, earth resistance R8 and the resistance R9 other end, the transformer T2 secondary other end is contact resistance R5 respectively, Mos pipe S pole and the former limit of transformer T1, the transformer T1 former limit other end is contact resistance R4 and the resistance R5 other end respectively, the resistance R4 other end connects Mos pipe G pole.
Chip IC model is UC3845A.
Triode D4 and triode D5 carries out clamp and absorption to peak voltage.
Output voltage values Ui is determined by resistance R14 resistance, diode D7 withstand voltage and electric capacity C9 capacitance.
Operation principle of the present utility model is: power supply through diode D2 and resistance R1 for chip IC provides voltage, chip IC port 3 exports pulse through the vibration of electric capacity C5 and transformer T1 coupling rear drive Mos pipe, when after the conducting of Mos pipe, output current is powered to the load after electric capacity C9 filtering by inductance L, when Mos pipe ends, inductance L magnetic energy changes electric energy into, its negative right side, polarity left side just, sustained diode 4 and sustained diode 5 conducting, electric current continues to power to the load by sustained diode 4 and sustained diode 5, load is made to obtain level and smooth direct current, when output voltage too low or too high time, from resistance R10, resistance R11, obtain sampling voltage in the bleeder circuit that resistance R12 forms and deliver to control Mos pipe conducting pulsewidth after chip IC and chip IC internal reference voltage compare, thus output voltage is stablized.When load current be short-circuited or more than 8A time, the voltage rise of chip IC port 3 can control pulsewidth makes Mos pipe end, to guarantee the safety of Mos pipe.
Can regulation output voltage U i by regulating resistance R14 resistance, diode D7 withstand voltage and electric capacity C9 capacitance, obtain any voltage value between 0 ~ 48V.For ensureing Mos pipe safety, input voltage Uo is preferably no more than 48V.
Claims (4)
1. a DC-DC power source converter circuit, comprise reduction voltage circuit, control circuit, start-up circuit and filter circuit, it is characterized in that, described reduction voltage circuit is by twice transformation of transformer T1 and transformer T2, realize the transfer process of DC-DC, reduction voltage circuit comprises transformer T1, transformer T2 and resistance R4, described control circuit adopts peak current mode double-loop control mode, namely in voltage close loop control system, peak current FEEDBACK CONTROL is added, control circuit comprises chip IC, electric capacity C6 and resistance R2, described start-up circuit starts whole DC-DC change-over circuit by the break-make of Mos pipe, start-up circuit comprises Mos pipe, diode D2 and resistance R1, the mixed and disorderly voltage signal that described filter circuit elimination is unnecessary, filter circuit comprises ground capacity C1 and ground capacity C2,
The described ground capacity C1 other end connects ground connection diode D1 negative pole respectively, ground capacity C2, diode D2 positive pole, Mos pipe D pole and input Uo, diode D2 negative pole contact resistance R1, the resistance R1 other end connects ground capacity C2 respectively, ground capacity C3, resistance R14 and chip IC port 2, chip IC port one connects ground capacity C4 and resistance R2 respectively, chip IC port 3 connects electric capacity C5, electric capacity C5 other end connection transformer T1 secondary, transformer T1 secondary other end ground connection, chip IC port 4 ground connection, chip IC port 5 is the contact resistance R2 other end and ground capacity C8 respectively, chip IC port 6 is contact resistance R9 and ground capacity C7 respectively, chip IC port 7 connects electric capacity C6 respectively, resistance R3 and resistance R10, chip IC port 8 connects the electric capacity C6 other end and the resistance R3 other end respectively, the described resistance R10 other end connects earth resistance R11 respectively, resistance R12 and resistance R13, the described resistance R14 other end connects diode D6 negative pole, diode D6 positive pole is the contact resistance R12 other end respectively, the resistance R13 other end, inductance L, diode D7, electric capacity C9 and output Ui, the inductance L other end connects ground connection diode D4 negative pole respectively, ground connection diode D5 negative pole and transformer T2 secondary, one end, transformer T2 former limit ground connection, the transformer T2 former limit other end connects earth resistance R6 and diode D3 positive pole respectively, diode D3 negative pole connects earth resistance R7 respectively, earth resistance R8 and the resistance R9 other end, the described transformer T2 secondary other end is contact resistance R5 respectively, Mos pipe S pole and the former limit of transformer T1, the transformer T1 former limit other end is contact resistance R4 and the resistance R5 other end respectively, the resistance R4 other end connects Mos pipe G pole.
2. DC-DC power source converter circuit according to claim 1, is characterized in that, described chip IC model is UC3845A.
3. DC-DC power source converter circuit according to claim 1, is characterized in that: also comprise triode D4 and triode D5, and triode D4 and triode D5 carries out clamp and absorption to peak voltage.
4. DC-DC power source converter circuit according to claim 1, is characterized in that: the output voltage values Ui of described DC-DC power source converter circuit is determined by resistance R14 resistance, diode D7 withstand voltage and electric capacity C9 capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420689073.1U CN204205959U (en) | 2014-11-17 | 2014-11-17 | A kind of DC-DC power source converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420689073.1U CN204205959U (en) | 2014-11-17 | 2014-11-17 | A kind of DC-DC power source converter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204205959U true CN204205959U (en) | 2015-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420689073.1U Expired - Fee Related CN204205959U (en) | 2014-11-17 | 2014-11-17 | A kind of DC-DC power source converter circuit |
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| CN (1) | CN204205959U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450018A (en) * | 2015-12-30 | 2016-03-30 | 国网山东郓城县供电公司 | Power boost chopper control system |
| CN107294470A (en) * | 2017-07-07 | 2017-10-24 | 佛山领新信息科技有限公司 | A kind of motor for washer control system |
| CN108091294A (en) * | 2017-12-28 | 2018-05-29 | 合肥学院 | A kind of intelligent exhibition screen drive system |
-
2014
- 2014-11-17 CN CN201420689073.1U patent/CN204205959U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450018A (en) * | 2015-12-30 | 2016-03-30 | 国网山东郓城县供电公司 | Power boost chopper control system |
| CN107294470A (en) * | 2017-07-07 | 2017-10-24 | 佛山领新信息科技有限公司 | A kind of motor for washer control system |
| CN108091294A (en) * | 2017-12-28 | 2018-05-29 | 合肥学院 | A kind of intelligent exhibition screen drive system |
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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: 20150311 Termination date: 20161117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |