CN203734526U - Step-down switching power circuit - Google Patents
Step-down switching power circuit Download PDFInfo
- Publication number
- CN203734526U CN203734526U CN201320885486.2U CN201320885486U CN203734526U CN 203734526 U CN203734526 U CN 203734526U CN 201320885486 U CN201320885486 U CN 201320885486U CN 203734526 U CN203734526 U CN 203734526U
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- CN
- China
- Prior art keywords
- triode
- capacitor
- inductance
- voltage
- down switching
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- Expired - Fee Related
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Abstract
The utility model relates to the field of a power circuit, and especially relates to a step-down switching power circuit. The step-down switching power circuit comprises a triode VT1, an inductor L, and a capacitor C. A pole end of rectified voltage Ui is connected with a collector electrode of the triode VT1, and an emitting electrode of the triode VT1 is connected with the inductor L. The inductor L outputs DC voltage U0. An end of the capacitor C is connected with an output end of the inductor L, and the other end of the capacitor C is connected with the other pole of the rectified voltage Ui. A base electrode of the triode VT1 accesses impulse voltage. The circuit uses few components, and structure is simple and operation is convenient.
Description
Technical field
The utility model relates to power circuit field, relates in particular to a kind of step down switching regulator circuit of using.
Background technology
The circuit of existing Switching Power Supply is more complicated all generally, need special Switching Power Supply to drive chip, cause like this cost very high, can in the circuit of some heavy loads, use.And some lower powered electronic products adopt this type of Switching Power Supply while needing isolated from power, cost is larger, has affected the economy of this electronic product, and relatively waste seems.And the volume of such Switching Power Supply is often relatively large, can affect the overall dimension of whole electronic product.
Summary of the invention
The purpose of this utility model is in order to provide a kind of simple in structure, uses the few step down switching regulator circuit of components and parts.
The technical scheme that the utility model provides is:
Step down switching regulator circuit, comprises triode VT1, inductance L and capacitor C.The collector electrode of an extreme connecting triode VT1 of commutating voltage Ui, the emitter of triode VT1 connects inductance L, inductance L output dc voltage U0, capacitor C one end is connected on the output of inductance L, the capacitor C other end connects another utmost point of commutating voltage Ui, the base stage access pulse voltage of described triode VT1.
Concrete, between triode VT1 and inductance L, connect the negative pole end of diode VD1, the positive pole of diode VD1 connects another utmost point of commutating voltage Ui.
Concrete, described capacitor C two ends are parallel with resistance R L.
The utility model is when triode VT1 conducting, and diode VD1 ends, and the commutating voltage of input charges to capacitor C through triode VT1 and L, and this electric current increases the energy storage in inductance L; When triode VT1 ends, the voltage that inductance L induces discharges through load resistance RL and fly-wheel diode VD1 the energy of storing in inductance L, maintains output dc voltage constant.The height of circuit output dc voltage is determined by the pulse duration being added in triode VT1 base stage.The utility model is used element few, simple in structure, easy to operate.
Accompanying drawing explanation
Fig. 1 is that this uses novel structural representation.
Embodiment
As shown in Figure 1, be step down switching regulator circuit, by triode VT1, inductance L, capacitor C diode VD1 and resistance R L, formed.The collector electrode of an extreme connecting triode VT1 of commutating voltage Ui, the emitter of triode VT1 connects inductance L, inductance L output dc voltage U0, and capacitor C one end is connected on the output of inductance L, the capacitor C other end connects another utmost point of commutating voltage Ui, and capacitor C two ends are parallel with resistance R L.The base stage access pulse voltage of described triode VT1.The negative pole end that connects diode VD1 between triode VT1 and inductance L, the positive pole of diode VD1 connects another utmost point of commutating voltage Ui.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement embodiment of the present utility model; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (3)
1. step down switching regulator circuit, it is characterized in that, comprise triode VT1, inductance L and capacitor C, the collector electrode of an extreme connecting triode VT1 of commutating voltage Ui, the emitter of triode VT1 connects inductance L, inductance L output dc voltage U0, and capacitor C one end is connected on the output of inductance L, the capacitor C other end connects another utmost point of commutating voltage Ui, the base stage access pulse voltage of described triode VT1.
2. step down switching regulator circuit according to claim 1, is characterized in that, connects the negative pole end of diode VD1 between triode VT1 and inductance L, and the positive pole of diode VD1 connects another utmost point of commutating voltage Ui.
3. step down switching regulator circuit according to claim 1, is characterized in that, described capacitor C two ends are parallel with resistance R L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320885486.2U CN203734526U (en) | 2013-12-31 | 2013-12-31 | Step-down switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320885486.2U CN203734526U (en) | 2013-12-31 | 2013-12-31 | Step-down switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734526U true CN203734526U (en) | 2014-07-23 |
Family
ID=51204568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320885486.2U Expired - Fee Related CN203734526U (en) | 2013-12-31 | 2013-12-31 | Step-down switching power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203734526U (en) |
-
2013
- 2013-12-31 CN CN201320885486.2U patent/CN203734526U/en not_active Expired - Fee Related
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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: 20140723 Termination date: 20141231 |
|
| EXPY | Termination of patent right or utility model |