CN205945515U - Switching power supply starts and protection circuit - Google Patents
Switching power supply starts and protection circuit Download PDFInfo
- Publication number
- CN205945515U CN205945515U CN201620662722.8U CN201620662722U CN205945515U CN 205945515 U CN205945515 U CN 205945515U CN 201620662722 U CN201620662722 U CN 201620662722U CN 205945515 U CN205945515 U CN 205945515U
- Authority
- CN
- China
- Prior art keywords
- resistance
- semiconductor
- oxide
- metal
- power supply
- 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.)
- Withdrawn - After Issue
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a switching power supply starts and protection circuit, it is including starting supply circuit and turn -offing supply circuit, it includes diode D2, resistance R1, resistance R2, resistance R3, resistance R6, MOS pipe Q1 and MOS pipe Q3 to start supply circuit, it includes electric capacity C1, electric capacity C2, diode D1, resistance R4, resistance R5, resistance R7, triode Q2, triode Q4 and stabilivolt VD2 to turn -off supply circuit, this switching power supply starts and protection circuit greatly reduced switching power supply in work or the energy consumption the during standby, and the cost is lower, the practicality is strong, has realized real green power.
Description
Technical field
This utility model is related to field of switch power and in particular to a kind of Switching Power Supply starts and protection circuit.
Background technology
At present, the normal work for ensureing Switching Power Supply PWM chip provides startup electricity it is necessary to setting starts resistance for it
Stream；In the application of more pulsewidth input range, in order to meet when its input is minimum, the integrated energy of pulse-width controlled of power supply is normal
Start it is often necessary to adopt the minimum startup resistance of resistance；However, now, when being worked with maximum input voltage, have a large amount of
Electric current through startup resistance, be easily caused resistance and send out, so increase thermal losses；The development lived with low-carbon (LC), now increasingly
Many electronic products are required to there is extremely low standby power, therefore how to reduce the energy when working or being standby for the Switching Power Supply
Loss is the emphasis that people need to pay close attention to further and study.
Utility model content
For above-mentioned deficiency of the prior art, the Switching Power Supply that this utility model provides starts and the big reduction of protection circuit
Switching Power Supply work or standby when energy consumption, and also can achieve hiccup protections in short circuit for the power supply.
In order to reach above-mentioned utility model purpose, the technical solution adopted in the utility model is：A kind of Switching Power Supply is provided
Start and protection circuit, it includes starting power supply circuits and turns off power supply circuits；Start power supply circuits and include diode D2, resistance
R1, resistance R2, resistance R3, resistance R6, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3；Turn off power supply circuits and include electric capacity C1, electric capacity C2, diode
D1, resistance R4, resistance R5, resistance R7, audion Q2, audion Q4 and stabilivolt VD2；
The grid of metal-oxide-semiconductor Q1 is connected with one end of resistance R2 one end and resistance R3, and the drain electrode of metal-oxide-semiconductor Q1 is with diode D2's
Positive pole connects, and the source electrode of metal-oxide-semiconductor Q1 is connected with one end of resistance R1；The grid of metal-oxide-semiconductor Q3 is connected with one end of resistance R6, MOS
The source electrode of pipe Q3 is connected with one end of the emitter stage, one end of resistance R7 and electric capacity C2 of audion Q4, the drain electrode of metal-oxide-semiconductor Q3 with
The other end of resistance R3 connects；The other end of resistance R2 is connected with the other end of resistance R1 and the other end of resistance R6；Diode
The negative pole of D2 is connected with the power interface of power management IC, and the other end of resistance R1 is connected with DC power anode；
The emitter stage of audion Q2 is connected with one end of resistance R4 and one end of electric capacity C1, the base stage of audion Q2 and electric capacity
The colelctor electrode of the other end of C1 and audion Q4 connects, the base stage of the colelctor electrode of audion Q2 and audion Q4, resistance R7 another
The positive pole of one end and stabilivolt VD2 connects；One end of the negative pole of stabilivolt VD2 and resistance R5, the positive pole of diode D1 and electric capacity
The other end of C2 connects, the other end of described resistance R5 and the negative pole of diode D1, the other end of resistance R4, diode D2 negative
The power interface of pole and power management IC connects, one end ground connection of resistance R7.
Further, also include an auxiliary charging circuit powered for power management IC.
Further, auxiliary charging circuit include diode D3, U polar capacitor C3, transformator and with transformator main pole with
Assists winding N of side；The two ends of assists winding N are connected with the positive pole of diode D3 and the negative pole of U polar capacitor C3 respectively, U pole
The property positive pole of electric capacity C3 is connected with the negative pole of the negative pole of diode D3 and diode D2, the minus earth of U polar capacitor C3.
Further, also include for protecting the stabilivolt VD1 of metal-oxide-semiconductor Q1 and the stabilivolt for protecting metal-oxide-semiconductor Q3
VD3.
Further, stabilivolt VD1 is in parallel with resistance R2.
Further, one end of stabilivolt VD3 is connected with the grid of metal-oxide-semiconductor Q3, and the other end is connected with the source electrode of metal-oxide-semiconductor Q3
Connect.
Further, metal-oxide-semiconductor Q1 is p-channel metal-oxide-semiconductor, and metal-oxide-semiconductor Q3 is n-channel metal-oxide-semiconductor.
The beneficial effects of the utility model are：This Switching Power Supply starts and protection circuit is closed by one of each electronic component
The layout designs of reason, significantly reduce the energy consumption when working or being standby for the Switching Power Supply；And start-up circuit is using having electricity
Flow the metal-oxide-semiconductor of little pressure relatively low effect or audion is realized, reduce cost；By the discharge and recharge time delay of electric capacity C2, can control
Power supply restart frequency, also can achieve the hiccup protections in short circuit for the power supply；Meanwhile, protect metal-oxide-semiconductor Q1 with stabilivolt VD1, use
VD3 protects metal-oxide-semiconductor Q3, prevents the grid of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3 and source voltage too high and damage.
Brief description
Fig. 1 is the connection block diagram of startup for Switching Power Supply and protection circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe it is clear that described embodiment is only a kind of embodiment of this utility model, rather than whole realities
Apply example.Based on the embodiment in this utility model, those of ordinary skill in the art institute under the premise of not making creative work
The every other embodiment obtaining, broadly falls into protection domain of the present utility model.
For the sake of simplicity, eliminate the technology general knowledge well known to this technology neighborhood technique personnel in herein below.
As shown in figure 1, this Switching Power Supply starts and protection circuit includes starting power supply circuits and turns off power supply circuits, pass through
Starting power supply circuits provides starting current for PWM chip；Start power supply circuits and include diode D2, resistance R1, resistance R2, resistance
R3, resistance R6, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3；Turn off power supply circuits and include electric capacity C1, electric capacity C2, diode D1, resistance R4, resistance
R5, resistance R7, audion Q2, audion Q4 and stabilivolt VD2；
The grid of metal-oxide-semiconductor Q1 is connected with one end of resistance R2 one end and resistance R3, and the drain electrode of metal-oxide-semiconductor Q1 is with diode D2's
Positive pole connects, and the source electrode of metal-oxide-semiconductor Q1 is connected with one end of resistance R1；The grid of metal-oxide-semiconductor Q3 is connected with one end of resistance R6, MOS
The source electrode of pipe Q3 is connected with one end of the emitter stage, one end of resistance R7 and electric capacity C2 of audion Q4, the drain electrode of metal-oxide-semiconductor Q3 with electricity
The other end of resistance R3 connects；The other end of resistance R2 is connected with the other end of resistance R1 and the other end of resistance R6；Diode D2
Negative pole be connected with the power interface of power management IC, the other end of resistance R1 is connected with DC power anode；
The emitter stage of audion Q2 is connected with one end of resistance R4 and one end of electric capacity C1, the base stage of audion Q2 and electric capacity
The colelctor electrode of the other end of C1 and audion Q4 connects, the base stage of the colelctor electrode of audion Q2 and audion Q4, resistance R7 another
The positive pole of one end and stabilivolt VD2 connects；One end of the negative pole of stabilivolt VD2 and resistance R5, the positive pole of diode D1 and electric capacity
The other end of C2 connects, the other end of described resistance R5 and the negative pole of diode D1, the other end of resistance R4, diode D2 negative
The power interface of pole and power management IC connects, one end ground connection of resistance R7.
In being embodied as, metal-oxide-semiconductor Q1 is p-channel metal-oxide-semiconductor, and metal-oxide-semiconductor Q3 is n-channel metal-oxide-semiconductor；When giving, resistance R1 is another
After the electrifying DC power supply that end connects, metal-oxide-semiconductor Q3 is driven conducting by R6, and resistance R2 and resistance R3 is as driving resistance by MOS
Pipe Q1 drives conducting, and now, electric current delivers to the power interface of power management IC after resistance R1 current limliting by diode D2, thus
PWM chip is enable to start.
Preferred embodiment of the present utility model is：Also include an auxiliary charging circuit powered for power management IC, work as electricity
Source control IC receives by starting startup after the starting current that power supply circuits provide, and meanwhile, auxiliary charging circuit will produce one
Stabling current is power management IC continued power.
Auxiliary charging circuit include diode D3, U polar capacitor C3, transformator and with the auxiliary of transformator main pole homonymy around
Group N；The two ends of assists winding N are connected with the positive pole of diode D3 and the negative pole of U polar capacitor C3 respectively, U polar capacitor C3's
Positive pole is connected with the negative pole of diode D3 and the negative pole of diode D2, the minus earth of U polar capacitor C3.
As shown in figure 1, when start have current flowing in power supply circuits when, because diode D2 negative pole and resistance R5 another
The other end of end and resistance R4 connects, therefore electric current turns off power supply circuits from startup power supply circuits flow direction, and now, electric capacity C1 is by resistance
R4 charges so that audion Q2 is in cut-off state for it；Equally, electric capacity C2 is charged for it by resistance R5, maintains the low of B point
Level state is it is ensured that audion Q4 is in cut-off state.
In implementation process, assists winding N and transformator main pole homonymy, after output voltage is set up, assists winding N defeated
Going out voltage also increases, when increase to than start power supply circuits internal electric source high when, will lifting start power supply circuits inside
Power supply.
Now, flow direction turns off the electric current of power supply circuits and increases, and then makes the voltage of B point exceed the electric conduction of stabilivolt VD2
Pressure, audion Q4 will be turned on by driving；Meanwhile, audion Q 2 is driven conducting, audion Q2 and audion Q4 structure by audion Q4
Become interlocking so that A point is in electronegative potential, metal-oxide-semiconductor Q3 is ended conducting, in the same manner, metal-oxide-semiconductor Q1 also can be in cut-off state；Now
Electric current will no longer pass resistance R1, and whole start-up circuit is closed.
After the input power of auxiliary charging circuit is closed or circuit is short-circuited, the power supply being produced by ancillary coil will drop
Low, now, B point voltage is less than stabilivolt VD2 conducting voltage, and diode D1 discharges electricity for electric capacity C2, in case next time is above before electricity
Delay audion Q4 to turn on, the circuit being made up of audion Q2 and audion Q4 will discharge interlocking, so that A point voltage is raised, drive
Metal-oxide-semiconductor Q3 turns on, repeated priming process；Actual experiment draws, this circuit energy consumption during starting PWM chip work
Be only 0.1W, with energy consumption in prior art be 1W start-up circuit compared with, this circuit greatly reduce Switching Power Supply work or
Energy consumption when standby is it is achieved that real green power supply.
In being embodied as, by the discharge and recharge time delay of electric capacity C2, controllable power restart frequency, also can achieve power supply
Hiccup protections in short circuit.
Preferred embodiment of the present utility model is：Also include for protecting the stabilivolt VD1 of metal-oxide-semiconductor Q1 and being used for protecting
The stabilivolt VD3 of metal-oxide-semiconductor Q3；In being embodied as, stabilivolt VD1 is in parallel with resistance R2, one end of stabilivolt VD3 and metal-oxide-semiconductor
The grid of Q3 connects, and the other end is connected with the source electrode of metal-oxide-semiconductor Q3；Metal-oxide-semiconductor Q1 is protected by stabilivolt VD1, in case metal-oxide-semiconductor Q1
Grid and source voltage are too high and damage, and protect metal-oxide-semiconductor Q3 by stabilivolt VD3, in case the grid of metal-oxide-semiconductor Q3 and source electrode electricity
Press through height and damage.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or new using this practicality
Type.Multiple modifications to these embodiments will be apparent from for those skilled in the art, defined herein
General Principle can realize in other embodiments in the case of the spirit or scope without departing from utility model.Therefore, originally
Utility model will not be limited and the embodiments shown herein, and is to fit to and principles disclosed herein and novelty
The property consistent scope the widest of feature.
Claims (7)
1. a kind of Switching Power Supply start and protection circuit it is characterised in that：Including startup power supply circuits and shutoff power supply circuits；Institute
State startup power supply circuits and include diode D2, resistance R1, resistance R2, resistance R3, resistance R6, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3；Described
Turn off power supply circuits and include electric capacity C1, electric capacity C2, diode D1, resistance R4, resistance R5, resistance R7, audion Q2, audion Q4
With stabilivolt VD2；
The grid of described metal-oxide-semiconductor Q1 is connected with one end of resistance R2 one end and resistance R3, and the drain electrode of metal-oxide-semiconductor Q1 is with diode D2's
Positive pole connects, and the source electrode of metal-oxide-semiconductor Q1 is connected with one end of resistance R1；The grid of described metal-oxide-semiconductor Q3 is connected with one end of resistance R6,
The source electrode of metal-oxide-semiconductor Q3 is connected with one end of the emitter stage, one end of resistance R7 and electric capacity C2 of audion Q4, the drain electrode of metal-oxide-semiconductor Q3
It is connected with the other end of resistance R3；The other end of described resistance R2 is connected with the other end of the other end of resistance R1 and resistance R6；
The described negative pole of diode D2 is connected with the power interface of power management IC, the other end of described resistance R1 and DC power anode
Connect；
The emitter stage of described audion Q2 is connected with one end of one end of resistance R4 and electric capacity C1, the base stage of audion Q2 and electric capacity
The colelctor electrode of the other end of C1 and audion Q4 connects, the base stage of the colelctor electrode of audion Q2 and audion Q4, resistance R7 another
The positive pole of one end and stabilivolt VD2 connects；The negative pole of described stabilivolt VD2 and one end of resistance R5, the positive pole of diode D1 and
Other end connection, the other end of described resistance R5 and the negative pole of diode D1, the other end of resistance R4, the diode D2 of electric capacity C2
Negative pole and the power interface of power management IC connect, one end of described resistance R7 ground connection.
2. Switching Power Supply according to claim 1 start and protection circuit it is characterised in that：Also including one is described power supply
The auxiliary charging circuit that management IC powers.
3. Switching Power Supply according to claim 2 start and protection circuit it is characterised in that：Described auxiliary charging circuit bag
Include diode D3, U polar capacitor C3, transformator and assists winding N with transformator main pole homonymy；The two of described assists winding N
End is connected with the positive pole of diode D3 and the negative pole of U polar capacitor C3 respectively, the positive pole of described U polar capacitor C3 and diode D3
Negative pole and diode D2 negative pole connect, the minus earth of described U polar capacitor C3.
4. Switching Power Supply according to any one of claims 1 to 3 start and protection circuit it is characterised in that：Also include using
Stabilivolt VD3 in the stabilivolt VD1 of protection metal-oxide-semiconductor Q1 with for protecting metal-oxide-semiconductor Q3.
5. Switching Power Supply according to claim 4 start and protection circuit it is characterised in that：Described stabilivolt VD1 and electricity
Resistance R2 is in parallel.
6. Switching Power Supply according to claim 5 start and protection circuit it is characterised in that：The one of described stabilivolt VD3
End is connected with the grid of metal-oxide-semiconductor Q3, and the other end is connected with the source electrode of metal-oxide-semiconductor Q3.
7. Switching Power Supply according to claim 6 start and protection circuit it is characterised in that：Described metal-oxide-semiconductor Q1 is p-channel
Metal-oxide-semiconductor, metal-oxide-semiconductor Q3 is n-channel metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620662722.8U CN205945515U (en) | 2016-06-29 | 2016-06-29 | Switching power supply starts and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620662722.8U CN205945515U (en) | 2016-06-29 | 2016-06-29 | Switching power supply starts and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205945515U true CN205945515U (en) | 2017-02-08 |
Family
ID=57930811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620662722.8U Withdrawn - After Issue CN205945515U (en) | 2016-06-29 | 2016-06-29 | Switching power supply starts and protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205945515U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978316A (en) * | 2016-06-29 | 2016-09-28 | 成都四威功率电子科技有限公司 | Switching power supply start and protection circuit |
| CN108631259A (en) * | 2018-04-24 | 2018-10-09 | 安徽艾可蓝环保股份有限公司 | A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit |
| CN110661313A (en) * | 2019-09-26 | 2020-01-07 | 宁夏电通物联网科技股份有限公司 | Window voltage control storage battery discharge protection circuit based on discrete component |
-
2016
- 2016-06-29 CN CN201620662722.8U patent/CN205945515U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978316A (en) * | 2016-06-29 | 2016-09-28 | 成都四威功率电子科技有限公司 | Switching power supply start and protection circuit |
| CN105978316B (en) * | 2016-06-29 | 2018-07-24 | 成都四威功率电子科技有限公司 | A kind of Switching Power Supply starts and protection circuit |
| CN108631259A (en) * | 2018-04-24 | 2018-10-09 | 安徽艾可蓝环保股份有限公司 | A kind of adjustable overcurrent protection and overcurrent turn-off function latching circuit |
| CN110661313A (en) * | 2019-09-26 | 2020-01-07 | 宁夏电通物联网科技股份有限公司 | Window voltage control storage battery discharge protection circuit based on discrete component |
| CN110661313B (en) * | 2019-09-26 | 2023-06-02 | 宁夏电通物联网科技股份有限公司 | Window voltage control storage battery discharge protection circuit based on discrete component |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100592614C (en) | Source electrode driven inverse-excitation converting circuit | |
| CN205945515U (en) | Switching power supply starts and protection circuit | |
| CN205070791U (en) | Switching power supply from supply circuit | |
| CN206559229U (en) | A kind of switching regulator soft-start circuit | |
| CN102739077A (en) | Auxiliary power supply of switching power supply | |
| CN108964434A (en) | A kind of power down delay protection circuit for Switching Power Supply | |
| CN109347311A (en) | A kind of self-powered driving circuit of double tube positive exciting circuit of synchronous rectification | |
| CN206442289U (en) | A kind of Switching Power Supply low-power consumption fast start circuit | |
| CN206807283U (en) | A kind of start-up circuit of Switching Power Supply | |
| CN109004818A (en) | Essential safe type direct current capacitive load relaxed starter | |
| CN205249042U (en) | Reduce switching power supply input impulse current's circuit | |
| CN207304498U (en) | A kind of inverse E class power amplification circuits | |
| CN204271907U (en) | A kind of soft starting circuit for APFC converter | |
| CN207283501U (en) | A kind of inverse E class power amplification circuits | |
| CN101902128B (en) | Flyback power converter | |
| JP2016539617A (en) | Flyback type switching power supply circuit and backlight driving device using the same | |
| WO2016161746A1 (en) | Power supply circuit and power supply method | |
| CN207368744U (en) | Power supply power switching circuit | |
| CN207368649U (en) | A kind of inrush current suppression circuit | |
| CN101572491B (en) | Switch power circuit and operation method thereof | |
| CN105978316B (en) | A kind of Switching Power Supply starts and protection circuit | |
| CN205792500U (en) | A kind of inductive load voltage PWM magnetic release circuit | |
| CN205070792U (en) | Switching power supply from supply circuit | |
| CN207166838U (en) | A kind of backlight constant current drive circuit | |
| CN204145314U (en) | A kind of ship lock type Switching Power Supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170208 Effective date of abandoning: 20180724 |