CN203840202U - Switching power supply circuit for outputting stable low-voltage direct current - Google Patents
Switching power supply circuit for outputting stable low-voltage direct current Download PDFInfo
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- CN203840202U CN203840202U CN201320837118.0U CN201320837118U CN203840202U CN 203840202 U CN203840202 U CN 203840202U CN 201320837118 U CN201320837118 U CN 201320837118U CN 203840202 U CN203840202 U CN 203840202U
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- switching power
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- capacitor
- transformer
- power circuit
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- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims description 9
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Abstract
The utility model provides a switching power supply circuit for outputting stable low-voltage direct current. The switching power supply comprises a transformation module and a rectification filtering module connected to each other. The transformation module comprises a power conversion chip U1 and a transformer T1. The rectification filtering module comprises a resistor R7, a capacitor C5 connected with the resistor R7 in series, and a schottky diode D4 connected with the resistor R7 and the capacitor C5 in parallel. By the power conversion chip U1 and the transformer T1, high voltage commercial power is converted into low-voltage alternating current, and then by rectification and filtering circuits, smooth low-voltage direct current is output. The switching power supply circuit is simple in structure, and reasonably utilizes each component and interaction of the components, and thus cost of a switching power supply is recued, and circuit stability is improved, thereby improving quality of the switching power supply and enhancing protection of electronic devices.
Description
Technical field
It is that 6V, electric current are the switching power circuit of 300mA low-voltage DC that the utility model relates to a kind of switching power circuit of stable output low-voltage DC, particularly regulated output voltage.
Background technology
Various electronic products, in order normally to work under civil power, all need to do a switching power circuit conventionally.Current various switching power circuit less stable, causes the damage to electronic product, thereby reduces the useful life of electronic product.Complicated switching power circuit production cost is high at present, still immature to the assurance of stability.
Utility model content
In view of this, the technical problems to be solved in the utility model is to provide a kind of switching power circuit of energy stable output low-voltage DC.
For solving the problems of the technologies described above, the technical scheme that the utility model provides is: a kind of switching power circuit of stable output low-voltage DC, comprise interconnective voltage changing module and rectification filtering module, described voltage changing module comprises power conversion chip U1 and transformer T1, the drain lead D of described power conversion chip U1 is connected with primary coil one end of transformer T1, the source lead S of power conversion chip U1 is connected to the primary coil other end of transformer T1 by rectifier diode D3, the bypass pin BP of power conversion chip U1 is connected to source lead S by capacitor C 3, power conversion chip U1 feedback pin EN is by divider resistance R5, R6 is connected to transformer feedback induction coil one end, transformer T1 output induction coil connects rectification filtering module.
Described power conversion chip U1 adopts LNK564 series power supply chip.
Described rectification filtering module comprises resistance R 7, capacitor C 5, Schottky diode D4 and electrochemical capacitor C6 and resistance R 8, capacitor C 5 is connected with resistance R 7, capacitor C 5 other ends are connected the positive output end as described switching power circuit with Schottky diode D4 negative electrode, the output induction coil negative pole of transformer T1 is as the negative output terminal of described switching power circuit, and electrochemical capacitor C6 and resistance R 8 are parallel between the positive and negative output of described switching power circuit.
Described switching power circuit also comprises insurance filtration module, and described insurance filtration module input connects civil power, and output is connected with voltage changing module.
Described insurance filtration module comprises wire resistor R1, piezo-resistance MOV, thermistor NTC, rectifier diode D1, D2, electrochemical capacitor C1, C2, colour coding inductance L 1 and resistance R 2, described thermistor NTC one end connects input anode, the other end connects respectively and is connected colour coding inductance L 1 parallel with one another after the anode of piezo-resistance MOV and rectifier diode D1 and is connected with described transformer T1 the 1st input with after resistance R 2, described wire resistor R1 one end connects input cathode, the other end is connected with the source lead of described power conversion chip U1 after connecting respectively the negative electrode of piezo-resistance MOV and rectifier diode D2, described electrochemical capacitor C1, C2 one end is connected with resistance R 2 two ends respectively, the other end is connected in the source lead of described power conversion chip U1 simultaneously.
The each component parameters of described switching power circuit during as following table, can regulated output voltage be that 6V, electric current are 300mA low-voltage DC:
The making parameter of described transformer is as following table:
Compared with prior art, the utlity model has following advantage:
The power circuit that the utility model provides; by power conversion chip U1 and transformer T1; high pressure civil power is become to low-voltage AC; through the low-voltage DC of over commutation, filter circuit output smoothing, the utility model switching power circuit is simple in structure again, has rationally utilized each element and interaction thereof; reduce the cost of Switching Power Supply; improve circuit stability, thereby improved the quality of Switching Power Supply, strengthened the protection to electronic device.
Brief description of the drawings
Fig. 1 is the utility model electrical block diagram;
Fig. 2 is transformer T1 schematic diagram in the utility model embodiment.
Embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing and embodiment, the utility model is explained in further detail.
As shown in Figure 1, a kind of switching power circuit of stable output low-voltage DC, comprise interconnective voltage changing module 1 and rectification filtering module 2, described voltage changing module 1 comprises power conversion chip U1 and transformer T1, the drain lead D of described power conversion chip U1 is connected with primary coil one end of transformer T1, the source lead S of power conversion chip U1 is connected to the primary coil other end of transformer T1 by rectifier diode D3, the bypass pin BP of power conversion chip U1 is connected to source lead S by capacitor C 3, power conversion chip U1 feedback pin EN is by divider resistance R5, R6 is connected to transformer feedback induction coil one end, transformer T1 output induction coil connects rectification filtering module.
Described power conversion chip U1 adopts LNK564 series power supply chip.
As shown in Figure 2, the primary coil of described transformer T1 comprises three grades of coiling group N1, N2, N3, its secondary coil comprises one-level coiling group N4, all adopt and closely wind the line around mode, primary coil is drawn 1st～5 input ports, secondary coil is drawn 1,2 output ports, and the 3rd input of described primary coil is unsettled, and it is as shown in the table that it makes parameter:
Described rectification filtering module comprises resistance R 7, capacitor C 5, Schottky diode D4 and electrochemical capacitor C6 and resistance R 8, capacitor C 5 is connected with resistance R 7, capacitor C 5 other ends are connected the positive output end as described switching power circuit with Schottky diode D4 negative electrode, the output induction coil negative pole of transformer T1 is as the negative output terminal of described switching power circuit, and electrochemical capacitor C6 and resistance R 8 are parallel between the positive and negative output of described switching power circuit.
Described switching power circuit also comprises insurance filtration module, and described insurance filtration module input connects civil power, and output is connected with voltage changing module.
Described insurance filtration module 3 comprises wire resistor R1, piezo-resistance MOV, thermistor NTC, rectifier diode D1, D2, electrochemical capacitor C1, C2, colour coding inductance L 1 and resistance R 2, described thermistor NTC one end connects input anode, the other end connects respectively and is connected colour coding inductance L 1 parallel with one another after the anode of piezo-resistance MOV and rectifier diode D1 and is connected with described transformer T1 the 1st input with after resistance R 2, described wire resistor R1 one end connects input cathode, the other end is connected with the source lead of described power conversion chip U1 after connecting respectively the negative electrode of piezo-resistance MOV and rectifier diode D2, described electrochemical capacitor C1, C2 one end is connected with resistance R 2 two ends respectively, the other end is connected in the source lead of described power conversion chip U1 simultaneously.
Following table provides the present embodiment switching power circuit bill of materials:
After the insurance and filtering of civil power by insurance filtration module 3, flow to voltage changing module 1, through power conversion chip U1 and transformer T1, elementary high pressure civil power is converted to secondary low-voltage alternating current, pass through again the D4 of rectification filtering module and the rectification of C5, filter action, output smoothing is stable=6V, and I=300mA low-voltage DC.
The power circuit that the present embodiment provides, by power conversion chip U1 and transformer T1, high pressure civil power is become to low-voltage AC, through over commutation, filter circuit output valve be=6V again, the level and smooth low-voltage DC of I=300mA, the utility model switching power circuit is simple in structure, each element and interaction thereof are rationally utilized, reduce the cost of Switching Power Supply, improved circuit power, be applicable in the large-sized battery system such as energy storage, this circuit performance is stable, effectively reduce the electromagnetic interference of circuit, thereby improved the quality of Switching Power Supply.
Be more than embodiment of the present utility model, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection range of the present utility model.
Claims (5)
1. the switching power circuit of a stable output low-voltage DC, comprise interconnective voltage changing module (1) and rectification filtering module (2), it is characterized in that: described voltage changing module (1) comprises power conversion chip U1 and transformer T1, the drain lead D of described power conversion chip U1 is connected with primary coil one end of transformer T1, the source lead S of power conversion chip U1 is connected to the primary coil other end of transformer T1 by rectifier diode D3, the bypass pin BP of power conversion chip U1 is connected to source lead S by capacitor C 3, power conversion chip U1 feedback pin EN is by divider resistance R5, R6 is connected to transformer feedback induction coil one end, transformer T1 output induction coil connects rectification filtering module.
2. the switching power circuit of stable output low-voltage DC according to claim 1, is characterized in that: described power conversion chip U1 adopts LNK564 series power supply chip.
3. the switching power circuit of stable output low-voltage DC according to claim 2, it is characterized in that: described rectification filtering module (2) comprises resistance R 7, capacitor C 5, Schottky diode D4 and electrochemical capacitor C6 and resistance R 8, capacitor C 5 is connected with resistance R 7, capacitor C 5 other ends are connected the positive output end as described switching power circuit with Schottky diode D4 negative electrode, the output induction coil negative pole of transformer T1 is as the negative output terminal of described switching power circuit, electrochemical capacitor C6 and resistance R 8 are just being parallel to described switching power circuit, between negative output terminal.
4. the switching power circuit of stable output low-voltage DC according to claim 1, it is characterized in that: described switching power circuit also comprises insurance filtration module (3), described insurance filtration module (3) input connects civil power, and output is connected with voltage changing module.
5. the switching power circuit of stable output low-voltage DC according to claim 3, it is characterized in that: described capacitor C 3, C5 is patch capacitor, nominal capacity is respectively 0.1 μ F, 1000pF, permissible variation is respectively ± and 10%, ± 20%, rated voltage is respectively 50V, 100V, temperature and capacity error coding are respectively X7R, Y5V, the nominal capacity of electrochemical capacitor C6 is 470 μ F, permissible variation is all ± 20%, rated voltage is 16V, described resistance R 5, R6, R7, R8 is Chip-R, its resistance is respectively 4.42K Ω, 24.9K Ω, 5.6 Ω, 6.8K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320837118.0U CN203840202U (en) | 2013-12-19 | 2013-12-19 | Switching power supply circuit for outputting stable low-voltage direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320837118.0U CN203840202U (en) | 2013-12-19 | 2013-12-19 | Switching power supply circuit for outputting stable low-voltage direct current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203840202U true CN203840202U (en) | 2014-09-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320837118.0U Expired - Lifetime CN203840202U (en) | 2013-12-19 | 2013-12-19 | Switching power supply circuit for outputting stable low-voltage direct current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203840202U (en) |
-
2013
- 2013-12-19 CN CN201320837118.0U patent/CN203840202U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140917 |
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| CX01 | Expiry of patent term |