CN206962429U - A kind of input protection circuit of Switching Power Supply - Google Patents
A kind of input protection circuit of Switching Power Supply Download PDFInfo
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- CN206962429U CN206962429U CN201720696965.8U CN201720696965U CN206962429U CN 206962429 U CN206962429 U CN 206962429U CN 201720696965 U CN201720696965 U CN 201720696965U CN 206962429 U CN206962429 U CN 206962429U
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- resistance
- divider portion
- resistor
- protection circuit
- input protection
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Abstract
The utility model discloses a kind of input protection circuit of Switching Power Supply; including the first divider portion and the second divider portion being serially connected; first divider portion connects positive source; second divider portion connects GND; second divider portion is parallel with NPN type triode; the control module of the colelctor electrode connection circuit of the triode so that control module is powered or power-off.Based on said structure, only it is made up of three parts, it is simple in construction, effectively reduce manufacturing cost, circuit need to be only accessed during use, without individually connecing electricity.
Description
Technical field
It the utility model is related to field of circuit technology, more particularly to a kind of input protection circuit of Switching Power Supply.
Background technology
In switching power circuit, when metal-oxide-semiconductor (insulating properties FET in integrated circuit) conducting, transformer are operated in high frequency
When under state, the secondary of transformer can produce reflected voltage, and the voltage that metal-oxide-semiconductor is born is reflected voltage and transformer primary side
The superposition of input voltage.When input voltage raises extremely, it is superimposed with after reflected voltage, the voltage of metal-oxide-semiconductor is easy to exceed
Tolerance range and cause to burn out, power supply will fail.
In order to avoid such case, input SRE module is typically chosen in the prior art, works as input voltage
When too high, relay will disconnect, and cut-out input, protect metal-oxide-semiconductor not to be burned with this.But relay module is in itself
Cost is higher, needs to match associated appliance element during use, needs individually power supply during work, so not only make it that circuit is complicated,
Also increase the cost used.
Therefore it provides a kind of input protection circuit of Switching Power Supply, simple in construction, manufacturing cost is reduced, need not during use
Electricity individually is connect, just turns into those skilled in the art's urgent problem to be solved.
Utility model content
The purpose of this utility model is to provide a kind of input protection circuit of Switching Power Supply, and simple in construction, reduction is manufactured into
Originally, without individually connect electricity during use.
To achieve these goals, the utility model provides the input protection circuit of Switching Power Supply, including be serially connected
First divider portion and the second divider portion, first divider portion connect positive source, and second divider portion connects GND, described
Second divider portion is parallel with NPN type triode, the control module of the colelctor electrode connection circuit of the triode so that control module
It is powered or powers off.
Preferably, first divider portion includes first resistor and second resistance, the first resistor and second electricity
Resistance series connection.
Preferably, the first resistor is fixed value resistance.
Preferably, the second resistance is fixed value resistance.
Preferably, the resistance of the first resistor is equal with the resistance of the second resistance.
Preferably, second divider portion includes 3rd resistor.
Preferably, the 3rd resistor is fixed value resistance.
This is using new provided input protection circuit, including the first divider portion and the second divider portion being serially connected,
First divider portion connects positive source, and second divider portion connects GND, and second divider portion is parallel with NPN type three
Pole pipe, the control module of the colelctor electrode connection circuit of the triode so that control module is powered or power-off.In foregoing circuit,
A branch road is separated in positive source, GND is accessed after the first divider portion and the second divider portion have been sequentially connected in series on the branch road,
The positive pole of the base stage connection branch road of a NPN type triode in parallel in two divider portions, wherein NPN type triode, emitter stage connection
The negative pole of branch road, colelctor electrode link control module.Wherein the first divider portion and the second divider portion are divided the voltage in branch road
Match somebody with somebody, because NPN type triode is in parallel with the second divider portion, branch voltage is divided by the first divider portion and the second divider portion
Match somebody with somebody so that the voltage of the second divider portion both sides reaches the operating voltage of NPN type triode so that NPN type triode normal work.
In the course of the work, when voltage is normal, NPN triode is in cut-off state, and control module normally exports square wave, when voltage raises
When, triode drags down control module tie point voltage, and over-pressed signal is conveyed into control module, makes control module cut-out square wave defeated
Go out.
Based on said structure, only it is made up of three parts, it is simple in construction, effectively reduce manufacturing cost, only need to access during use
Circuit, without individually connecing electricity.
Brief description of the drawings
Fig. 1 is the schematic diagram of input protection circuit provided by the utility model.
Description of reference numerals：
1 is the first divider portion, and 11 be first resistor, and 12 be second resistance；
2 be the second divider portion；
3 be NPN type triode；
4 be control module；
5 be positive source.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
Fig. 1 is refer to, Fig. 1 is the schematic diagram of input protection circuit provided by the utility model.
In a kind of embodiment, input protection circuit provided by the utility model, including be serially connected
One divider portion 1 and the second divider portion 2, first divider portion 1 connect positive source 5, and second divider portion 2 connects GND, institute
State the second divider portion 2 and be parallel with NPN type triode 3, the control module 4 of the colelctor electrode connection circuit of the triode so that control
Molding block 4 is powered or powered off.In foregoing circuit, a branch road is separated in positive source 5, first point has been sequentially connected in series on the branch road
GND is accessed after the divider portion 2 of splenium 1 and second, a NPN type triode 3 in parallel, the wherein pole of NPN type three in the second divider portion 2
The positive pole of the base stage connection branch road of pipe 3, emitter stage connect the negative pole of branch road, colelctor electrode link control module 4.Wherein the first partial pressure
Voltage in branch road is allocated by the divider portion 2 of portion 1 and second, because NPN type triode 3 is in parallel with the second divider portion 2, is passed through
The distribution of first divider portion 1 and the second divider portion 2 to branch voltage so that the voltage of the both sides of the second divider portion 2 reaches NPN type three
The operating voltage of pole pipe 3 so that the normal work of NPN type triode 3.In the course of the work, when voltage is normal, NPN type triode 3
In cut-off state, control module 4 normally exports square wave, and when the voltage increases, NPN type triode 3 drags down control module connection
Point voltage, control module is conveyed to by over-pressed signal, makes control module cut-out square wave output.
Based on said structure, only it is made up of three parts, it is simple in construction, effectively reduce manufacturing cost, only need to access during use
Circuit, without individually connecing electricity.
It is further understood that, first divider portion 1 includes first resistor 11 and second resistance 12, the first resistor
11 and the second resistance 12 connect.First divider portion 1 includes first resistor 11 and second resistance 12, the wherein He of first resistor 11
The connected mode of second resistance 12 is connects, and the first divider portion 1 carries out partial pressure using resistance in the structure, due to the stabilization of resistance
Property is good, small by such environmental effects, therefore shares voltage stabilization, so as to preferably ensure the voltage needed for subsequent element,
The first divider portion 1 is divided into two parts simultaneously, can avoid because a resistance produces the change of resistance using heating for a long time
Change and influence the work of follow-up component, two resistance use simultaneously, effectively can disperse heat, effectively reduce resistance
Influence of the factors such as self-heating to circuit.
It is pointed out that it can also be variable resistor that first resistor 11 and second resistance 12, which can be fixed value resistance, when
When first resistor 11 and second resistance 12 are fixed value resistance, the manufacturing cost of whole circuit is low, when the electricity of first resistor 11 and second
When resistance 12 is variable resistor, whole circuit goes for a variety of open by adjusting the resistance of first resistor 11 and second resistance 12
Close the demand of supply voltage.
Specifically, the first resistor 11 is fixed value resistance.Above-mentioned first resistor 11 is fixed value resistance, fixed value resistance it is steady
It is qualitative good, the precision of detection can be effectively improved, and meanwhile it is low from cost, and then reduce the cost of design and the manufacture of circuit.
Of course for meeting that the above-mentioned each first resistor 11 of different detection demands can also select resistance adjustable resistance, so as to improve the inspection
The adaptability of slowdown monitoring circuit.Meanwhile first resistor 11 is metalfilmresistor or fixed carbon resister, above two electric resistance structure has good
Heat dispersion, resistance value be influenced by temperature it is small, can effectively ensure that institute's component voltage numerical stability (i.e. realize effectively it is steady
Fixed partial pressure), so as to ensure the precision of detection.
Specifically, the second resistance 12 is fixed value resistance.Above-mentioned second resistance 12 is fixed value resistance, fixed value resistance it is steady
It is qualitative good, the precision of detection can be effectively improved, and meanwhile it is low from cost, and then reduce the cost of design and the manufacture of circuit.
Of course for meeting that the above-mentioned each second resistance 12 of different detection demands can also select resistance adjustable resistance, so as to improve the inspection
The adaptability of slowdown monitoring circuit.Meanwhile second resistance 12 is metalfilmresistor or fixed carbon resister, above two electric resistance structure has good
Heat dispersion, resistance value be influenced by temperature it is small, can effectively ensure that institute's component voltage numerical stability (i.e. realize effectively it is steady
Fixed partial pressure), so as to ensure the precision of detection.
Further, the resistance of the first resistor 11 is equal with the resistance of the second resistance 12.Above-mentioned first resistor
11 and the resistance all same of second resistance 12, i.e., the magnitude of voltage that both assign to is equal, is easy to calculate the voltage of the second divider portion 2,
First resistor 11 is identical with the resistance of second resistance 12 simultaneously, and the resistance from a model is only needed during circuit is made
, therefore can effectively reduce the manufacturing cost of circuit.
Specifically understand, second divider portion 2 includes 3rd resistor.Second divider portion 2 includes 3rd resistor, due to
NPN type triode 3 is in parallel with the second divider portion 2, and the voltage that both carry is identical, and the stability of resistance is good, by environmental factor shadow
Sound is small, therefore shares voltage stabilization, so as to preferably ensure the voltage stabilization of the loading of NPN type triode 3, is ensureing operation just
Often.
It is pointed out that it can also be variable resistor that 3rd resistor, which can be fixed value resistance, when 3rd resistor is definite value
During resistance, the manufacturing cost of whole circuit is low, and when 3rd resistor is variable resistor, whole circuit is by adjusting 3rd resistor
Resistance goes for the demand of a variety of supply voltage switches.
Specifically, the 3rd resistor is fixed value resistance.Above-mentioned 3rd resistor is fixed value resistance, the stability of fixed value resistance
It is good, the precision of detection can be effectively improved, and meanwhile it is low from cost, and then reduce the cost of design and the manufacture of circuit.Certainly
In order to meet that the above-mentioned each 3rd resistor of different detection demands can also select resistance adjustable resistance, so as to improve the detection circuit
Adaptability.Meanwhile 3rd resistor is metalfilmresistor or fixed carbon resister, above two electric resistance structure has good thermal diffusivity
Can, resistance value is influenced by temperature small, can effectively ensure that institute's component voltage numerical stability (realizes effectively stable point
Pressure), so as to ensure the precision of detection.
The various embodiments described above are only preferred embodiments of the present utility model, in the art, every to be based on this reality
With the changes and improvements in new technique scheme, should not exclude outside the scope of protection of the utility model.
Claims (7)
1. a kind of input protection circuit of Switching Power Supply, it is characterised in that including the first divider portion (1) being serially connected and second
Divider portion (2), the first divider portion (1) connection positive source (5), the second divider portion (2) connection GND, described second
Divider portion (2) is parallel with NPN type triode (3), the control module (4) of the colelctor electrode connection circuit of the triode so that control
Molding block (4) is powered or power-off.
2. input protection circuit according to claim 1, it is characterised in that first divider portion (1) includes the first electricity
Hinder (11) and second resistance (12), the first resistor (11) and the second resistance (12) series connection.
3. input protection circuit according to claim 2, it is characterised in that the first resistor (11) is fixed value resistance.
4. input protection circuit according to claim 3, it is characterised in that the second resistance (12) is fixed value resistance.
5. input protection circuit according to claim 4, it is characterised in that the resistance of the first resistor (11) with it is described
The resistance of second resistance (12) is equal.
6. input protection circuit according to claim 5, it is characterised in that second divider portion (2) includes the 3rd electricity
Resistance.
7. input protection circuit according to claim 6, it is characterised in that the 3rd resistor is fixed value resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720696965.8U CN206962429U (en) | 2017-06-15 | 2017-06-15 | A kind of input protection circuit of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720696965.8U CN206962429U (en) | 2017-06-15 | 2017-06-15 | A kind of input protection circuit of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206962429U true CN206962429U (en) | 2018-02-02 |
Family
ID=61379246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720696965.8U Active CN206962429U (en) | 2017-06-15 | 2017-06-15 | A kind of input protection circuit of Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206962429U (en) |
-
2017
- 2017-06-15 CN CN201720696965.8U patent/CN206962429U/en active Active
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