CN202997958U - Switch power supply with high voltage input automatic turn-off protection function - Google Patents
Switch power supply with high voltage input automatic turn-off protection function Download PDFInfo
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- CN202997958U CN202997958U CN 201220719003 CN201220719003U CN202997958U CN 202997958 U CN202997958 U CN 202997958U CN 201220719003 CN201220719003 CN 201220719003 CN 201220719003 U CN201220719003 U CN 201220719003U CN 202997958 U CN202997958 U CN 202997958U
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Abstract
The utility model discloses a switch power supply with a high voltage input automatic turn-off protection function, comprising a switch converter, an input side circuit located at the input side of the switch converter, and an output side circuit located at the output side of the switch converter, wherein the input side circuit is provided with a rectification module, a filtering module, a DM0265 chip and a protection module, the protection module is provided with a voltage stabilizer and a voltage sampling module connected with the filtering module in parallel, one end of the voltage stabilizer senses the voltage value of the voltage sampling module, and the other two ends of the voltage stabilizer are connected between the ground and the VCC end of the DM0265 chip. The switch power supply has a overvoltage automatic protection capability, such that the safety coefficient of the whole switch power supply is increased.
Description
Technical field
The utility model relates to field of switch power, relates in particular the Switching Power Supply that a kind of high input voltage automatically shuts down protection.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch pipe turns on and off is kept a kind of power supply of regulated output voltage.This Switching Power Supply generally all comprises switch converters, this switch converters has input side and outlet side, the input side of this switch converters all has again rectification module and filtration module, this rectification module can be connected with civil power with filtration module, can be for follow-up direct current thereby alternating current is converted to.
Because the scope of application of Switching Power Supply is quite extensive; such as in the abominable especially place of operational environment; AC-input voltage has the situation over 400V to occur often; so for general Switching Power Supply; the acp chip (such as the DM0265 chip) that its input side arranges will directly be damaged; thereby bring very large puzzlement for people's work and life, be badly in need of thus a kind ofly working under normal voltage, and the Switching Power Supply that still can automatically protect during over certain limit at voltage.
The utility model content
The purpose of this utility model is to provide a kind of high input voltage to automatically shut down the Switching Power Supply of protection, and in prior art, the problem of power supply easily appears damaging in Switching Power Supply when facing adverse circumstances thereby solve.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of high input voltage automatically shuts down the Switching Power Supply of protection, the input side circuit and the outlet side circuit that is positioned at the switch converters outlet side that comprise switch converters and lay respectively at the switch converters input side, this input side circuit has rectification module, filtration module and DM0265 chip; Wherein, this input side circuit also has protection module; the voltage sample module that this protection module has pressurizer and is connected in parallel on the filtration module two ends, the magnitude of voltage of this pressurizer one end induced voltage sampling module, two ends are connected between the VCC end of the earth and DM0265 chip in addition.
Described voltage sample module comprises connected the first resistance, the second resistance and the 3rd resistance of serial connection successively, the free end of this first resistance and the 3rd resistance is connected in parallel on filtration module two ends, is the voltage sample point that is connected with pressurizer between this second resistance and the 3rd resistance.
Described the first resistance, the second resistance and the 3rd resistance are trimmable resistance.
Described filtration module also comprises basic electric capacity and is serially connected in withstand voltage electric capacity on basic electric capacity.
Described basic electric capacity and withstand voltage electric capacity are adjustable electric capacity.
After adopting said structure; a kind of high input voltage that the utility model relates to automatically shuts down the Switching Power Supply of protection; it is provided with protection module by the input side at switch converters; so under adverse circumstances; when the AC-input voltage of Switching Power Supply surpasses normal operating range; the voltage that this voltage sample module samples obtains can puncture pressurizer; make the VCC end of this DM0265 chip to be connected with the earth; namely avoided because exchanging input side voltage increases and allow the excessive problem of VCC terminal voltage, and then avoided the DM0265 chip to damage.Compared with prior art, the utility model allows whole Switching Power Supply can have certain self-insurance ability, has improved the coefficient of safety of whole Switching Power Supply.
Description of drawings
Fig. 1 is that the utility model relates to the theory diagram that a kind of high input voltage automatically shuts down the Switching Power Supply of protection.
Fig. 2 is that the utility model relates to a kind of physical circuit figure that a kind of high input voltage automatically shuts down the Switching Power Supply of protection.
In figure:
Switching Power Supply-100; Switch converters-1; Input side circuit-2;
Rectification module-21; Filtration module-22; DM0265 chip-23;
Pressurizer-24; Voltage sample module-25; Outlet side circuit-3.
Embodiment
In order further to explain the technical solution of the utility model, the utility model is elaborated below by specific embodiment.
As depicted in figs. 1 and 2; the utility model relates to the Switching Power Supply 100 that a kind of high input voltage automatically shuts down protection; it comprises switch converters 1, input side circuit 2 and outlet side circuit 3; this input side circuit 2 is positioned at the input side of switch converters 1; this outlet side circuit 3 is positioned at the outlet side of switch converters 1, and this input side circuit 2 has rectification module 21, filtration module 22 and DM0265 chip 23.
Main improvements of the present utility model are: as shown in Figure 1; this input side circuit 2 also has protection module; this protection module specifically comprises again pressurizer 24 and voltage sample module 25; this voltage sample module 25 is connected in parallel on the two ends of filtration module 22; the magnitude of voltage of these pressurizer 24 1 end induced voltage sampling modules 25, two ends are connected between the VCC end of the earth and DM0265 chip 23 in addition.
As shown in Figure 2, it is the physical circuit figure of a kind of preferred embodiment of the utility model, wherein, this voltage sample module 25 comprises connected the first resistance R 5, the second resistance R 7 and the 3rd resistance R 8 of serial connection successively, the free end of this first resistance R 5 and the 3rd resistance R 8 is connected in parallel on filtration module 22 two ends, is the voltage sample point that is connected with pressurizer 24 between this second resistance R 7 and the 3rd resistance R 8; In order to have wider accommodation, this first resistance R 5, the second resistance R 7 and the 3rd resistance R 8 are trimmable resistance.
More preferably, in order to allow the electric capacity in this filtration module 22 can have higher voltage endurance capability, this filtration module 22 also comprises basic capacitor C 1 and is serially connected in withstand voltage capacitor C 2 on basic capacitor C 1, and wherein, this basic capacitor C 1 and withstand voltage capacitor C 2 are adjustable electric capacity.
Like this, the utility model is provided with protection module by the input side at switch converters 1, so under adverse circumstances, when the AC-input voltage of Switching Power Supply 100 surpasses normal operating range, the voltage that these voltage sample module 25 samplings obtain can puncture pressurizer 24, make the VCC end of this DM0265 chip 23 directly to be connected with the earth, namely avoid because exchanging input side voltage increases and make the VCC terminal voltage excessive, and then played the effect of protection DM0265 chip 23; Particularly, in the present embodiment, in the time of in alternating voltage is the 80-400V scope, whole Switching Power Supply 100 normal operations when voltage is in 400-600V, can be in the self-insurance state.
In sum, compared with prior art, the utility model allows whole Switching Power Supply 100 can have certain self-insurance ability, has improved the coefficient of safety of whole Switching Power Supply 100.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.
Claims (5)
1. a high input voltage automatically shuts down the Switching Power Supply of protection, the input side circuit and the outlet side circuit that is positioned at the switch converters outlet side that comprise switch converters and lay respectively at the switch converters input side, this input side circuit has rectification module, filtration module and DM0265 chip; It is characterized in that; this input side circuit also has protection module; the voltage sample module that this protection module has pressurizer and is connected in parallel on the filtration module two ends, the magnitude of voltage of this pressurizer one end induced voltage sampling module, two ends are connected between the VCC end of the earth and DM0265 chip in addition.
2. a kind of high input voltage according to claim 1 automatically shuts down the Switching Power Supply of protection; it is characterized in that; described voltage sample module comprises connected the first resistance, the second resistance and the 3rd resistance of serial connection successively; the free end of this first resistance and the 3rd resistance is connected in parallel on filtration module two ends, is the voltage sample point that is connected with pressurizer between this second resistance and the 3rd resistance.
3. a kind of high input voltage according to claim 2 automatically shuts down the Switching Power Supply of protection, it is characterized in that, described the first resistance, the second resistance and the 3rd resistance are trimmable resistance.
4. a kind of high input voltage according to claim 1 automatically shuts down the Switching Power Supply of protection, it is characterized in that, described filtration module also comprises basic electric capacity and is serially connected in withstand voltage electric capacity on basic electric capacity.
5. a kind of high input voltage according to claim 4 automatically shuts down the Switching Power Supply of protection, it is characterized in that, described basic electric capacity and withstand voltage electric capacity are adjustable electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719003 CN202997958U (en) | 2012-12-24 | 2012-12-24 | Switch power supply with high voltage input automatic turn-off protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719003 CN202997958U (en) | 2012-12-24 | 2012-12-24 | Switch power supply with high voltage input automatic turn-off protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997958U true CN202997958U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220719003 Expired - Fee Related CN202997958U (en) | 2012-12-24 | 2012-12-24 | Switch power supply with high voltage input automatic turn-off protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202997958U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939005A (en) * | 2015-03-05 | 2016-09-14 | 日本冲信息株式会社 | Power device and printing device |
-
2012
- 2012-12-24 CN CN 201220719003 patent/CN202997958U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939005A (en) * | 2015-03-05 | 2016-09-14 | 日本冲信息株式会社 | Power device and printing device |
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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: 20130612 Termination date: 20151224 |
|
| EXPY | Termination of patent right or utility model |