CN206697912U - A kind of overvoltage crowbar of Switching Power Supply - Google Patents
A kind of overvoltage crowbar of Switching Power Supply Download PDFInfo
- Publication number
- CN206697912U CN206697912U CN201720471543.0U CN201720471543U CN206697912U CN 206697912 U CN206697912 U CN 206697912U CN 201720471543 U CN201720471543 U CN 201720471543U CN 206697912 U CN206697912 U CN 206697912U
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- voltage
- power supply
- regulator diode
- triode
- negative electrode
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Abstract
The utility model proposes a kind of overvoltage crowbar of Switching Power Supply, it is connected between external power supply unit and switching power circuit, including：First resistor accesses external power supply unit live wire, its plus earth line to the 4th resistance, the first voltage-regulator diode, the second voltage-regulator diode, triode and metal-oxide-semiconductor after the first voltage-regulator diode negative electrode series connection first resistor；4th resistance is connected between transistor base and the first voltage-regulator diode negative electrode；Second voltage-regulator diode anode connects transistor base, and its negative electrode connects external power supply unit live wire；It is grounded after transistor collector concatenation 3rd resistor, emitter stage connects the second voltage-regulator diode negative electrode；Second resistance is connected between transistor collector and emitter stage；Metal-oxide-semiconductor grid and source electrode are connected respectively transistor collector and emitter stage, and its drain electrode connects Switching Power Supply input.Using the overvoltage crowbar in the technical program, circuit structure is simple, and reliability is high, and power attenuation is low.
Description
Technical field
A kind of switching power circuit is the utility model is related to, more particularly to a kind of overvoltage crowbar of Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology, maintains a kind of power supply of regulated output voltage.With electric power electricity
The development and innovation of sub- technology so that power technology is also innovated constantly.At present, Switching Power Supply with small-sized, light weight and efficiently
The characteristics of rate, is widely used in almost all of electronic equipment, is current electronics and information industry rapid development indispensable one
Kind power mode.
Switching Power Supply traditional at present, overvoltage protection circuit grade is various, but most complex circuit, protection point voltage range
Span is big, and precision is not high, and power attenuation is big, and reliability is not high.
Utility model content
In order to solve the problems, such as the above, the utility model provides a kind of overvoltage crowbar of Switching Power Supply to tackle this
Problem.
What the technical solution of the utility model was realized in：
The utility model discloses a kind of overvoltage crowbar of Switching Power Supply, and it is connected to external power supply unit and switch
Between power circuit, including：First resistor, second resistance, 3rd resistor, the 4th resistance, the first voltage-regulator diode, the second voltage stabilizing
Diode, triode and metal-oxide-semiconductor,
The external power supply unit live wire, its anode are accessed after described the first voltage-regulator diode negative electrode series connection first resistor
Ground wire；4th resistance is connected between transistor base and the first voltage-regulator diode negative electrode；The pole of second voltage stabilizing two
Tube anode connects transistor base, and its negative electrode connects the external power supply unit live wire；The transistor collector concatenates 3rd resistor
After be grounded, emitter stage connects the second voltage-regulator diode negative electrode；The second resistance is connected to the transistor collector and transmitting
Between pole；The metal-oxide-semiconductor grid and source electrode are connected respectively transistor collector and emitter stage, and it is defeated that its drain electrode connects Switching Power Supply
Enter end.
Further, described metal-oxide-semiconductor is Cool-Mos switching tubes.
Further, the first described voltage-regulator diode voltage of voltage regulation value is no more than Switching Power Supply over-voltage protection point setting electricity
Pressure value.
Further, the second described voltage-regulator diode voltage of voltage regulation value is less than and protected between transistor base and emitter stage
Magnitude of voltage.
Implement a kind of overvoltage crowbar of Switching Power Supply of the present utility model, there is technique effect beneficial below：
Implement a kind of overvoltage crowbar of Switching Power Supply of technical solutions of the utility model, its circuit structure is simple, member
Number of devices is few, and reliability is high, and power attenuation is low.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of the overvoltage crowbar of Switching Power Supply of embodiment of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Referring to Fig. 1, embodiment of the present utility model, a kind of overvoltage crowbar of Switching Power Supply, it is connected to outside
Between power supply unit and switching power circuit, including：First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4,
First voltage-regulator diode ZD1, the second voltage-regulator diode ZD2, triode Q1 and metal-oxide-semiconductor Q2,
External power supply unit live wire, its plus earth are accessed after first voltage-regulator diode ZD1 negative electrodes series connection first resistor R1
Line；4th resistance R4 is connected between triode Q1 base stages and the first voltage-regulator diode ZD1 negative electrodes；Second voltage-regulator diode ZD2
Anode connects triode Q1 base stages, and its negative electrode connects external power supply unit live wire；Triode Q1 collector series connection 3rd resistors R3 is followed by
Ground wire, emitter stage connect the second voltage-regulator diode ZD2 negative electrodes；Second resistance R2 be connected to triode Q1 collector and emitters it
Between；Metal-oxide-semiconductor Q2 grids and source electrode are connected respectively triode Q1 collector and emitters, and it, which drains, connects Switching Power Supply input
End.
According to a specific embodiment, metal-oxide-semiconductor Q2 is Cool-Mos switching tubes.
According to a specific embodiment, the first voltage-regulator diode ZD1 voltage of voltage regulation value is protected no more than Switching Power Supply overvoltage
Shield point setting magnitude of voltage.
According to a specific embodiment, the second voltage-regulator diode ZD2 voltage of voltage regulation value is less than triode Q1 base stages and hair
Magnitude of voltage is protected between emitter-base bandgap grading.
It is further illustrated below as follows：
One, parameter settings：
1.ZD1 voltage of voltage regulation is the voltage of over-voltage protection point.
2.ZD2 voltage of voltage regulation is to protect voltage between triode Q1 base stage and emitter stage.
Two, operation principles：
1st, when external power supply unit VCC_IN voltages are when within ZD1 voltage of voltage regulation, voltage-stabiliser tube ZD1 is not turned on,
So triode Q1 is equivalent to be pulled upward to external power supply unit VCC_ by two resistance of first resistor R1 and the 4th resistance R4
IN, triode Q1 end.So metal-oxide-semiconductor Q2 will be turned on, and VCC_OUT just has output, be powered to rear class switching power circuit.
2nd, when external power supply unit VCC_IN is more than the first voltage-regulator diode ZD1 voltage of voltage regulation, voltage-stabiliser tube turns on, and makes
Voltage-stabiliser tube cathode voltage maintains voltage of voltage regulation, and so, triode Q1 BE voltage across poles is just not 0 volt, and triode Q1 starts
Conducting, so that metal-oxide-semiconductor Q2 gate voltage is equal to source voltage, is turned it off.Then rear class power supply is also just disconnected.
Have in practice been verified that, the utility model advantage is：
Implement a kind of overvoltage crowbar of Switching Power Supply of technical solutions of the utility model, circuit structure is simple, first device
Number of packages amount is few, and reliability is high, and power attenuation is low.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in
Protection domain within.
Claims (4)
1. a kind of overvoltage crowbar of Switching Power Supply, it is characterised in that it is connected to external power supply unit and switch power supply
Between road, including：First resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the pole of the first voltage stabilizing two
(ZD1), the second voltage-regulator diode (ZD2), triode (Q1) and metal-oxide-semiconductor (Q2) are managed,
Described the first voltage-regulator diode negative electrode (ZD1) series connection first resistor (R1) accesses the external power supply unit live wire afterwards,
Its plus earth line；4th resistance (R4) be connected to triode (Q1) base stage and the first voltage-regulator diode (ZD1) negative electrode it
Between；Second voltage-regulator diode (ZD2) anode connects triode (Q1) base stage, and its negative electrode connects the external power supply unit live wire；
Triode (Q1) the collector series connection 3rd resistor (R3) is grounded afterwards, and emitter stage connects the second voltage-regulator diode (ZD2) negative electrode；
The second resistance (R2) is connected between the triode (Q1) collector and emitter；Metal-oxide-semiconductor (Q2) grid and source
Pole is connected respectively triode (Q1) collector and emitter, and its drain electrode connects Switching Power Supply input.
2. overvoltage crowbar according to claim 1, it is characterised in that described metal-oxide-semiconductor (Q2) is opened for Cool-Mos
Guan Guan.
3. overvoltage crowbar according to claim 1, it is characterised in that described the first voltage-regulator diode (ZD1) is steady
Magnitude of voltage is pressed no more than Switching Power Supply over-voltage protection point setting magnitude of voltage.
4. overvoltage crowbar according to claim 1, it is characterised in that described the second voltage-regulator diode (ZD2) is steady
Pressure magnitude of voltage protects magnitude of voltage less than triode (Q1) between base stage and emitter stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720471543.0U CN206697912U (en) | 2017-04-28 | 2017-04-28 | A kind of overvoltage crowbar of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720471543.0U CN206697912U (en) | 2017-04-28 | 2017-04-28 | A kind of overvoltage crowbar of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206697912U true CN206697912U (en) | 2017-12-01 |
Family
ID=60447625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720471543.0U Expired - Fee Related CN206697912U (en) | 2017-04-28 | 2017-04-28 | A kind of overvoltage crowbar of Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206697912U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098619A (en) * | 2020-09-18 | 2020-12-18 | 河北紫旭节能环保技术咨询有限公司 | Groundwater pollution detection device |
| CN112157118A (en) * | 2020-09-18 | 2021-01-01 | 河北紫旭节能环保技术咨询有限公司 | Soil detection and restoration device |
-
2017
- 2017-04-28 CN CN201720471543.0U patent/CN206697912U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112098619A (en) * | 2020-09-18 | 2020-12-18 | 河北紫旭节能环保技术咨询有限公司 | Groundwater pollution detection device |
| CN112157118A (en) * | 2020-09-18 | 2021-01-01 | 河北紫旭节能环保技术咨询有限公司 | Soil detection and restoration device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171201 Termination date: 20200428 |
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| CF01 | Termination of patent right due to non-payment of annual fee |