CN201550023U - Sampling circuit for switch power supply protection schottky - Google Patents
Sampling circuit for switch power supply protection schottky Download PDFInfo
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- CN201550023U CN201550023U CN2009202054301U CN200920205430U CN201550023U CN 201550023 U CN201550023 U CN 201550023U CN 2009202054301 U CN2009202054301 U CN 2009202054301U CN 200920205430 U CN200920205430 U CN 200920205430U CN 201550023 U CN201550023 U CN 201550023U
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- resistance
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- power supply
- schottky
- supply protection
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Abstract
The utility model discloses a sampling circuit for switch power supply protection schottky, comprising two output resistances, three resistances, a capacitance and a diode; in the three resistances, one end of a first resistance is connected with the joint of two output resistances; the output resistance comprises a first output resistance and a second output resistance; a second resistance is connected with the capacitance in parallel, one end, after the second resistance is connected with the capacitance in parallel, is connected with the other end of the first resistance, and the other end thereof is connected with the second output resistance; a third resistance is connected with the diode in series, after serial connection, one end is connected with the other end of the first resistance and with one end of the second resistance after the second resistance is connected with the diode in parallel, and the other end is connected with a secondary coil of a transformer; when in use, by adopting the sampling circuit of the utility model, the alternating voltage inducted by the secondary coil of the transformer is stable, the schottky aging time when the usage is carried out at full load can be prolonged, full load aging using time is longer and the product shell is not damaged; in addition, the circuit in the utility model has simple working principle, is practical and has low cost.
Description
Technical field
The utility model relates to protective circuit, concretely, is meant a kind of sample circuit that is applied to Switching Power Supply protection Schottky.
Background technology
The sample circuit of existing protective circuit of switch power source as shown in Figure 1, the sample circuit of this protective circuit is: chip IC 3 is formed negative feedbacks by resistance R 12 and resistance R 13 from output sampling and chip IC 2 and is controlled elementary frequency of oscillation.Frequency of oscillation elementary when output voltage is high is understood step-down, causes the output voltage step-down, otherwise then uprises.Thereby realize the output voltage stabilizing.The secondary coil of transformer induces very high peak values of ac voltage simultaneously, also can change along with the variation of elementary frequency of oscillation.And this peak values of ac voltage can be described as deathblow to Schottky, particularly easier damage when being fully loaded with long-time wearing out.
The utility model content
The purpose of this utility model is to provide a kind of sample circuit that is used for Switching Power Supply protection Schottky, and it can overcome existing shortcoming, can prolong when fully loaded the use ageing time of Schottky.
For achieving the above object, technical scheme that the utility model adopts is:
A kind of sample circuit that is used for Switching Power Supply protection Schottky, it includes two output resistances, and two output resistances link to each other, and wherein: it also further includes three resistance, electric capacity and diode; In three resistance, wherein an end of first resistance links to each other with the junction of two output resistances; Output resistance comprises first output resistance and second output resistance; Second resistance is in parallel with electric capacity, and back in parallel one end links to each other with the other end of first resistance, and the other end links to each other with second output resistance; The 3rd resistance is connected with diode, and after the series connection, the other end of an end and first resistance and second resistance link to each other with a end after the electric capacity parallel connection, and the other end links to each other with the secondary coil of transformer.
Preferably, the resistance of the first above-mentioned resistance is 10K.
Preferably, the resistance of the second above-mentioned resistance is 5.6K.
Preferably, above-mentioned electric capacity is 104/50V, and promptly capacitance is 0.1uF, and rated voltage is 50V.
Preferably, the resistance of the 3rd above-mentioned resistance is 15K.
Preferably, above-mentioned diode model is IN4148.
Preferably, the resistance of the first above-mentioned output resistance is 4.7K.
Preferably, the resistance of the second above-mentioned output resistance is 6.2K.
The utility model adopts after the technique scheme, during use, by this novel sample circuit, can make the coil-induced alternating-voltage stabilization that goes out of transformer secondary output, can prolong the ageing time of Schottky when fully loaded the use, promptly can be fully loaded with aging the use for more time, and product casing can not damage; In addition, this new-type circuit operation principle is simple, practicality, and cost is low.
Description of drawings
Fig. 1 is existing charging circuit figure;
Fig. 2 is sample circuit figure of the present utility model.
Embodiment
With embodiment the invention is described below in conjunction with accompanying drawing, it only is a kind of embodiment of the invention, does not limit the scope of the invention with this.
See also shown in Figure 2ly, the utility model discloses a kind of sample circuit that is used for Switching Power Supply protection Schottky, it includes two output resistance R12, R13, three resistance R 16, R17, R18, capacitor C 10 and general-purpose diode D4, wherein:
Output resistance comprises first output resistance and second output resistance; First output resistance is R12, and second output resistance is R13;
The resistance of output resistance R12 is 4.7K.
The resistance of output resistance R13 is 6.2K.
The resistance of resistance R 16 resistance is 10K.
The resistance of resistance R 17 is 5.6K.
The resistance of resistance R 18 is 15K.
The model of general-purpose diode D4 is IN4148.
Two output resistance R12, R13 link to each other.One end of resistance R 16 links to each other with the junction of two output resistance R12, R13; Resistance R 17 is in parallel with capacitor C 10, and after the parallel connection, the one end links to each other with the other end of resistance R 16, and the other end links to each other with output resistance R13; Resistance R 18 is connected with diode D4, and after the series connection, an end links to each other with parallel connection one end of capacitor C 10 with resistance R 16 and resistance R 17, and the other end links to each other with the secondary coil of transformer T1.
During use, chip IC 3 is controlled elementary frequency of oscillation by R12, R13, R16, R17, R18 and capacitor C 10, general-purpose diode D4 from output sampling and chip IC 2 composition negative feedbacks.It has formed the interchange sample circuit, the alternating-voltage stabilization that the secondary coil of transformer T1 is induced, in addition, the sampling point that is added in chip IC 3 simultaneously owing to two groups of sampling voltages can cause that output voltage raises, so will change resistance R 125.1K into 4.7K, resistance R 134.7K changes 6.2K into, output voltage is kept with originally the same.
Though described the invention by embodiment, those of ordinary skills know, the invention has many distortion and variation and does not break away from the spirit of the invention, wishes that appended claim comprises these distortion and variation and do not break away from the spirit of the invention.
Claims (8)
1. one kind is used for the sample circuit that Switching Power Supply is protected Schottky, and it comprises two output resistances, and two output resistances link to each other, and it is characterized in that: it also further includes three resistance, electric capacity and diode; In three resistance, wherein an end of first resistance links to each other with the junction of two output resistances; Described two output resistances comprise first output resistance and second output resistance; Second resistance is in parallel with electric capacity, and back in parallel one end links to each other with the other end of first resistance, and the other end links to each other with described second output resistance; The 3rd resistance is connected with diode, and after the series connection, the other end of an end and first resistance and second resistance link to each other with a end after the electric capacity parallel connection, and the other end links to each other with the secondary coil of transformer.
2. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 1, it is characterized in that: the resistance of described first resistance is 10K.
3. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 1 or 2, it is characterized in that: the resistance of described second resistance is 5.6K.
4. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 1 or 2, it is characterized in that: described electric capacity is 104/50V, and promptly capacitance is 0.1uF, and rated voltage is 50V.
5. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 4, it is characterized in that: the resistance of described the 3rd resistance is 15K.
6. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 3, it is characterized in that: described diode model is IN4148.
7. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 5, it is characterized in that: the resistance of described first output resistance is 4.7K.
8. the sample circuit that is used for Switching Power Supply protection Schottky as claimed in claim 6, it is characterized in that: the resistance of described second output resistance is 6.2K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202054301U CN201550023U (en) | 2009-09-25 | 2009-09-25 | Sampling circuit for switch power supply protection schottky |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202054301U CN201550023U (en) | 2009-09-25 | 2009-09-25 | Sampling circuit for switch power supply protection schottky |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201550023U true CN201550023U (en) | 2010-08-11 |
Family
ID=42605206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202054301U Expired - Fee Related CN201550023U (en) | 2009-09-25 | 2009-09-25 | Sampling circuit for switch power supply protection schottky |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201550023U (en) |
-
2009
- 2009-09-25 CN CN2009202054301U patent/CN201550023U/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20120925 |