CN209001823U - A kind of power supply soft-start circuit - Google Patents
A kind of power supply soft-start circuit Download PDFInfo
- Publication number
- CN209001823U CN209001823U CN201822105320.XU CN201822105320U CN209001823U CN 209001823 U CN209001823 U CN 209001823U CN 201822105320 U CN201822105320 U CN 201822105320U CN 209001823 U CN209001823 U CN 209001823U
- Authority
- CN
- China
- Prior art keywords
- triode
- output end
- resistance
- resistor
- semiconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
A kind of power supply soft-start circuit, including input, output end, first capacitor, the second capacitor, metal-oxide-semiconductor, triode and periphery resistance；The source electrode of metal-oxide-semiconductor is connect with input terminal, and the drain electrode of metal-oxide-semiconductor is connect with output end；First capacitor is connected between the source electrode of metal-oxide-semiconductor and grid；Second capacitance connection is between output end and ground；One first resistor is connected between input terminal and output end after connecting with a second resistance, has common node between first resistor and second resistance；The base stage of triode is connected on common node, and the collector of triode is connect with input terminal, and the emitter of triode is connect by a 3rd resistor with output end.Due to can reduce dash current when powering on, and make the circuit of the application that there is advantage at low cost due to constituting power supply soft-start circuit by the common component such as resistance, capacitor, switching tube.
Description
Technical field
This application involves a kind of power supply soft-start circuits.
Background technique
During equipment or system electrification, if directly powered on, transient high-current may make equipment or system
At impact, stability and the service life of equipment or system are influenced.
Existing power source relaxed starter or circuit structure are complex, at high cost.
Summary of the invention
The application provides a kind of low-cost power supply soft-start circuit.
According in a first aspect, provide a kind of power supply soft-start circuit in a kind of embodiment, including input, output end,
One capacitor, the second capacitor, metal-oxide-semiconductor, triode and periphery resistance；The source electrode of metal-oxide-semiconductor is connect with input terminal, the drain electrode of metal-oxide-semiconductor
It is connect with output end；First capacitor is connected between the source electrode of metal-oxide-semiconductor and grid；Second capacitance connection is in output end and ground
Between；One first resistor is connected between input terminal and output end after connecting with a second resistance, first resistor and second resistance it
Between have common node；The triode is NPN type triode, and the base stage of triode is connected on common node, triode
Collector is connect with input terminal, and the emitter of triode is connect by a 3rd resistor with output end or the triode is
The base stage of PNP type triode, triode is connected on common node, and the emitter of triode is connect with input terminal, triode
Collector is connect by a 3rd resistor with output end.
Preferably, the 3rd resistor is 500 ohm.
Preferably, first resistor is 500 ohm, and second resistance is 2000 ohm.
It preferably, further include the 4th resistance, the grid of the 4th resistance one end and metal-oxide-semiconductor connects, and the other end is connected to ground.
Preferably, the model MMSF4205 of the metal-oxide-semiconductor.
Preferably, the model dtc144eet1 of the triode.
According to the power supply soft-start circuit of above-described embodiment, due to due to passing through common first device such as resistance, capacitor, switching tube
Part constitutes power supply soft-start circuit, can reduce dash current when powering on, and it is at low cost that the circuit of the application is had
Advantage.Furthermore it is possible to flexibly be applicable in different application and then the adjustment to component parameter.Further, this Shen
Please by the way that a triode is arranged, energy rapidly can be filled to system by 3rd resistor during power on delay, without making
At big loss.
Detailed description of the invention
Fig. 1 is the circuit diagram of the application power supply soft-start circuit.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
Referring to FIG. 1, power supply soft-start circuit, including input terminal VCC_IN, output end VCC_OUT, first capacitor C1,
Two capacitor C2, metal-oxide-semiconductor M1, triode Q1 and periphery resistance；The source electrode of metal-oxide-semiconductor M1 is connect with input terminal VCC_IN, metal-oxide-semiconductor M1
Drain electrode connect with output end VCC_OUT；First capacitor C1 is connected between the source electrode of metal-oxide-semiconductor and grid；Second capacitor C2 connects
It is connected between output end VCC_OUT and ground；First resistor R1 be connected to after connecting with second resistance R2 input terminal VCC_IN with it is defeated
Between outlet VCC_OUT, there is common node 1 between first resistor R1 and second resistance R2；Triode Q1 is three pole of NPN type
Pipe, the base stage of triode are connected on common node 1, and the collector of triode is connect with input terminal VCC_IN, the hair of triode
Emitter-base bandgap grading is connect by 3rd resistor R3 with output end VCC_OUT.Wherein, 3rd resistor R3 is 500 ohm, and first resistor R1 is
500 ohm, second resistance R2 is 2000 ohm.
In addition, further including the 4th resistance R4, the grid of the 4th one end resistance R4 and metal-oxide-semiconductor is connected, and the other end is connected to ground.
As a preferred embodiment, the model MMSF4205 of metal-oxide-semiconductor M1.
As a preferred embodiment, the model dtc144eet1 of triode Q1.
In above-described embodiment, triode uses NPN type triode, and in other embodiments, triode can also use PNP
Type triode, when using PNP type triode, the base stage of triode is connected on common node, the emitter of triode and input
The collector of end connection, triode is connect by 3rd resistor with output end.
The working principle of the application is illustrated below.
When plant-grid connection system, electric current charges to first capacitor C1 by the 4th resistance R4, first capacitor C1 electricity
Pressure gradually rises, and metal-oxide-semiconductor M1 is not turned on before first capacitor C1 voltage is not up to the turn-on threshold of metal-oxide-semiconductor M1.At this time due to
The partial pressure of first resistor R1 and second resistance R2, triode Q1 conducting, electric current give the second capacitor C2 by current limliting 3rd resistor R3
Charging, the voltage of output end VCC_OUT gradually rise.
When the raising of first capacitor C1 voltage reaches metal-oxide-semiconductor M1 conduction value, metal-oxide-semiconductor M1 conducting.At this point, due to output end
VCC_OUT has higher voltage, and the voltage of input terminal VCC_IN and the voltage difference of output end reduce, and output end will not generate
Big dash current has an impact system.
What needs to be explained here is that being within the period of delay start using the purpose of triode Q1, pass through resistance value
Smaller 3rd resistor efficiently gives the second capacitor C2 to charge；After system completion powers on, metal-oxide-semiconductor M1 is in the conductive state, second resistance
Pressure difference very little on R2, triode Q1 cut-off, electric current are no longer pass through 3rd resistor R3, reduce loss.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (6)
1. a kind of power supply soft-start circuit, which is characterized in that including input, output end, first capacitor, the second capacitor, MOS
Pipe, triode and periphery resistance；The source electrode of metal-oxide-semiconductor is connect with input terminal, and the drain electrode of metal-oxide-semiconductor is connect with output end；First electricity
Appearance is connected between the source electrode of metal-oxide-semiconductor and grid；Second capacitance connection is between output end and ground；One first resistor and one second
It is connected between input terminal and output end after resistance series connection, there is common node between first resistor and second resistance；Described three
Pole pipe is NPN type triode, and the base stage of triode is connected on common node, and the collector of triode is connect with input terminal, three
The emitter of pole pipe is connect by a 3rd resistor with output end or the triode is PNP type triode, the base of triode
Pole is connected on common node, and the emitter of triode is connect with input terminal, the collector of triode by a 3rd resistor with
Output end connection.
2. power supply soft-start circuit as described in claim 1, which is characterized in that the 3rd resistor is 500 ohm.
3. power supply soft-start circuit as described in claim 1, which is characterized in that first resistor is 500 ohm, and second resistance is
2000 ohm.
4. power supply soft-start circuit as described in claim 1, which is characterized in that further include the 4th resistance, the 4th resistance one end
It is connect with the grid of metal-oxide-semiconductor, the other end is connected to ground.
5. power supply soft-start circuit as described in claim 1, which is characterized in that the model MMSF4205 of the metal-oxide-semiconductor.
6. power supply soft-start circuit as described in claim 1, which is characterized in that the model of the triode
dtc144eet1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822105320.XU CN209001823U (en) | 2018-12-15 | 2018-12-15 | A kind of power supply soft-start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822105320.XU CN209001823U (en) | 2018-12-15 | 2018-12-15 | A kind of power supply soft-start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209001823U true CN209001823U (en) | 2019-06-18 |
Family
ID=66808864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822105320.XU Active CN209001823U (en) | 2018-12-15 | 2018-12-15 | A kind of power supply soft-start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209001823U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115912884A (en) * | 2022-10-26 | 2023-04-04 | 深圳迈格瑞能技术有限公司 | Soft start control circuit and method |
-
2018
- 2018-12-15 CN CN201822105320.XU patent/CN209001823U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115912884A (en) * | 2022-10-26 | 2023-04-04 | 深圳迈格瑞能技术有限公司 | Soft start control circuit and method |
| CN115912884B (en) * | 2022-10-26 | 2024-05-28 | 深圳迈格瑞能技术有限公司 | Soft start control circuit and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104122970A (en) | Power circuit | |
| CN213367403U (en) | Power input end surge current control circuit | |
| CN105762781A (en) | Surge current control circuit and power supply device | |
| CN205318129U (en) | Time -delay control circuit | |
| CN207612045U (en) | A kind of protection chip | |
| CN209001823U (en) | A kind of power supply soft-start circuit | |
| CN104102318A (en) | Power source circuit | |
| CN103607109A (en) | Power-supply soft-start circuit | |
| CN203691219U (en) | Isolating power drive circuit | |
| CN104779577B (en) | A kind of current foldback circuit | |
| CN107733219A (en) | A kind of Switching Power Supply output soft start circuit | |
| CN104753037A (en) | Thermal protection circuit | |
| CN207573234U (en) | A kind of Switching Power Supply output soft start circuit | |
| CN205490464U (en) | Delay circuit of repid discharge | |
| CN206742153U (en) | A kind of controllable time delay restarts circuit | |
| CN105423339A (en) | Pulse ignition control circuit and gas stove | |
| CN103904874A (en) | Delay soft start circuit used for BOOST-PFC | |
| CN209001565U (en) | A kind of under-voltage protecting circuit | |
| CN209001563U (en) | A kind of overvoltage crowbar | |
| CN108879629A (en) | A kind of lithium battery charger output anti-surge circuit | |
| CN104578840A (en) | Power supply circuit and electronic equipment with same | |
| CN209001912U (en) | A kind of square wave generative circuit | |
| CN203851016U (en) | A time-delay soft start circuit used for BOOST-PFC | |
| CN112564073A (en) | Electric impact current suppression circuit on airborne display | |
| CN209001915U (en) | A kind of electrification reset circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |