CN110417274A - The Switching Power Supply that chip can be automatically shut down when a kind of low-load - Google Patents
The Switching Power Supply that chip can be automatically shut down when a kind of low-load Download PDFInfo
- Publication number
- CN110417274A CN110417274A CN201910735549.8A CN201910735549A CN110417274A CN 110417274 A CN110417274 A CN 110417274A CN 201910735549 A CN201910735549 A CN 201910735549A CN 110417274 A CN110417274 A CN 110417274A
- Authority
- CN
- China
- Prior art keywords
- resistance
- capacitor
- electrical connection
- diode
- electrically connected
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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 invention discloses the Switching Power Supplies that chip when a kind of low-load can be automatically shut down, control the output end electrical connection of the VCC2 pin and power supply circuit of chip MCU2, the switching tube Q2 of the DRV pin and flyback switching circuit that control chip MCU2 is electrically connected with driving switch pipe Q2, capacitor C15 and phototriode U4A is parallel between the COMP pin and GND pin of control chip MCU2, the switching tube Q1 of the VOUT pin and booster circuit that control chip MCU1 is electrically connected with driving switch pipe Q1, control the VIN pin of chip MCU1, one end of capacitor C6, one end of capacitor CE2 and the collector electrical connection of PNP type triode Qx2.It is built based on Flyback and Boost framework topology and has the control circuit for automatically shutting down chip functions, there are two control chip MCU1, MCU2 of discrete for this Switching Power Supply tool, to respectively drive switching tube Q1, Q2, control circuit is in low-load by automatically shutting down control chip MCU1, MCU2, the scattered consumption of the complete machine idle work of Switching Power Supply is efficiently reduced, overall efficiency is promoted.
Description
Technical field
The present invention relates to the switch electricity that chip when switch power technology field more particularly to a kind of low-load can be automatically shut down
Source.
Background technique
As modern life quality is constantly promoted, people are also increasingly enhanced the consciousness to economize on resources, such as electric power money
Source；Wherein Switching Power Supply is one of the product needed using electric power；Demand of the daily life to Switching Power Supply is consequently increased.In
Under this background, people via requiring the power supply can to realize conversion function in early days, change to the attitude of Switching Power Supply transfer efficiency
Under the premise of now normal to power supply conversion, it is also necessary to reach energy efficiency indexes.Therefore the efficiency of Switching Power Supply has become design and opens
The unalterable quota in powered-down source.But worked at the same time when two or more discretes control chip MCU, complete machine will occur at light load
Efficiency is not up to standard, and complete machine power consumption in zero load is excessively high；These phenomenons are all the requirement index phases with people to Switching Power Supply
It violates.
Summary of the invention
The Switching Power Supply that chip can be automatically shut down when it is an object of the invention to propose a kind of low-load is led in low-load
It crosses and automatically shuts down control chip, efficiently reduce the scattered consumption of the complete machine idle work of Switching Power Supply, promote overall efficiency.
To achieve this purpose, the present invention adopts the following technical scheme:
The Switching Power Supply that chip can be automatically shut down when a kind of low-load, including it is input rectifying filter circuit, booster circuit, anti-
Energizing switch circuit, output regulator rectifier circuit, control circuit and power supply circuit, the input terminal of input rectifying filter circuit access city
Electricity, the input terminal electrical connection of the output end and booster circuit of input rectifying filter circuit, the input terminal and liter of flyback switching circuit
The output end of volt circuit is electrically connected, the output end of the flyback switching circuit, the input terminal of power supply circuit and output rectifying and voltage-stabilizing
The input terminal of circuit is electrically connected, the output end of power supply circuit and the input terminal electrical connection of control circuit, the control circuit it is defeated
The input terminal of outlet, the input terminal of flyback switching circuit and booster circuit is electrically connected；
The control circuit includes control chip MCU1, MCU2, capacitor C15, C6, Cj, CE2, diode Dx1, Dx2, electricity
Hinder Rx1, Rx2, Rx3, Rx4, NPN type triode Qx1, PNP type triode Qx2 and phototriode U4A, the control chip
MCU1 is that OB6563 controls chip, and the control chip MCU2 is that LD5523 controls chip；
The output end electrical connection of the VCC2 pin and power supply circuit of the control chip MCU2, controls the DRV of chip MCU2
The switching tube Q2 of pin and flyback switching circuit is electrically connected with driving switch pipe Q2, and the capacitor C15 and phototriode U4A are simultaneously
It is coupled between the COMP pin and GND pin of the control chip MCU2, and the GND pin of the control chip MCU2 connects
Ground, one end that capacitor C15 is connected with the COMP pin of control chip MCU2 are defined as node Vcomp, control the VCC2 of chip MCU2
Pin is defined as node VCC2；
The VOUT pin of the control chip MCU1 and the switching tube Q1 of booster circuit are electrically connected with driving switch pipe Q1, institute
State the collector electricity of the control VIN pin of chip MCU1, one end of capacitor C6, one end of capacitor CE2 and PNP type triode Qx2
Connection, one end electrical connection of the emitter and resistance Rx1 of the PNP type triode Qx2, the other end, the resistance of the resistance Rx1
One end of Rx2 and node VCC2 electrical connection, three pole of the other end of the resistance Rx2, the base stage of PNP type triode Qx2 and NPN type
The collector of pipe Qx1 is electrically connected, the base stage of the NPN type triode Qx1, one end of capacitor Cj, one end of resistance Rx4 and resistance
One end of Rx3 is electrically connected, and the cathode electrical connection of the other end and diode Dx1 of the resistance Rx3, the diode Dx1 is just
The electrical connection of the cathode of pole and diode Dx2, the anode and node V of the diode Dx2compElectrical connection, the NPN type triode
Another termination of the emitter of Qx1, the other end of capacitor CE2, the other end of resistance Rx4, the other end of capacitor C6 and capacitor Cj
Ground.
Preferably, the booster circuit include switching tube Q1, the first transformer T1, capacitor C1, C9, diode D2, D3A and
Resistance RS1, RS2, RS3, R17, R18, R19, one end of capacitor C1, the output end of input rectifying filter circuit and the first transformer
One end of the primary side winding of T1 is electrically connected, and the other end ground connection of capacitor C1, the switching tube Q1 is metal-oxide-semiconductor, the switching tube Q1
Drain electrode, the anode of diode D3A, one end of capacitor C9 and the first transformer T1 primary side winding other end electrical connection, two
The input terminal electrical connection of the cathode and flyback switching circuit of pole pipe D3A, the source electrode of switching tube Q1, the other end of capacitor C9, resistance
One end of RS2 and one end electrical connection of resistance RS3, the grid of switching tube Q1, one end of resistance R17, one end of resistance R18 and electricity
One end electrical connection of R19 is hindered, the anode of diode D2 and the other end of resistance R17 are electrically connected, cathode, the resistance of diode D2
The VOUT pin electrical connection of the other end and control chip MCU1 of R18, the other end of resistance R19 and one end of resistance RS1 are electrically connected
It connects, the other end ground connection of the other end of resistance RS1, the other end of resistance RS2 and resistance RS3.
Preferably, the flyback switching circuit include switching tube Q2, the second transformer T2, capacitor C10, resistance RS4, RS5,
RS6, R20, R24, R25 and diode D4, the switching tube Q2 are metal-oxide-semiconductor, the cathode and the second transformer of the diode D3A
One end of the primary side winding Np of T2 is electrically connected, the drain electrode of the switching tube Q2, one end of capacitor C10 and the second transformer T2 original
The other end of side winding Np is electrically connected, and one end electrical connection of the source electrode of switching tube Q2, the other end of capacitor C10 and resistance RS5 is opened
Close one end electrical connection of the grid of pipe Q2, one end of resistance R20, one end of resistance R24 and resistance R25, the other end of resistance R24
With the anode electrical connection of diode D4, the cathode of diode D4, the other end of resistance R25 and the DRV pin for controlling chip MCU2
Electrical connection, one end electrical connection of the other end of resistance R20, one end of resistance RS4 and resistance RS6, the other end, the electricity of resistance RS4
Hinder the other end of RS5 and the other end ground connection of resistance RS6.
Preferably, the flyback switching circuit further include diode D7, capacitor CE1, C16, C7, resistance R13A, R13B,
R14, R15, R116, R28, R29, R30, R31, one end of resistance R13A, one end of capacitor CE1, one end of capacitor C16, resistance
The cathode electrical connection of one end of R29, one end of resistance R30, one end of resistance R31 and diode D3A, resistance R13A are successively and electric
It is grounded, is grounded after capacitor C7 and resistance R116 parallel connection, the other end ground connection of capacitor CE1 after resistance R13B, R14, R15, R116 series connection,
The other end of capacitor C16, the other end of resistance R29, the other end of resistance R30, the other end of resistance R31 and diode D7 it is negative
Pole electrical connection, the anode of diode D7 and one end of resistance R28 are electrically connected, the second transformation of the other end and electrical connection of resistance R28
The other end of the primary side winding Np of device T2 is electrically connected.
Preferably, the output regulator rectifier circuit include capacitor C17, CE5-CE7, common mode inductance LF3, diode D8 and
Resistance R32, R33, R34, the vice-side winding Ns's of one end of R35, capacitor C17, the anode of diode D8 and the second transformer T2
One end electrical connection, the other end and resistance R34 of capacitor C17, one end electrical connection of R35, resistance R34, the other end of R35, two poles
The cathode of pipe D8, one end of capacitor CE5-CE7, one end of resistance R32, R33 and common mode inductance LF3 first input end be electrically connected
It connects, the first output end and output cathode the interface electrical connection of common mode inductance LF3, the second output terminal and output of common mode inductance LF3
The electrical connection of cathode interface, the other end of vice-side winding Ns, the other end of capacitor CE5-CE7, the resistance R32 of the second transformer T2,
The other end of R33 and the second input end grounding of common mode inductance LF3, capacitor CE5-CE7 is by capacitor CE5, capacitor CE6 and capacitor
CE7 is composed in parallel, and resistance R32, R33 are composed in parallel by resistance R32 and resistance R33, and resistance R34, R35 is by resistance R34 and resistance
R35 is composed in parallel.
Preferably, the output regulator rectifier circuit include capacitor C17, CE5-CE7, common mode inductance LF3, diode D8 and
Resistance R32, R33, R34, the vice-side winding Ns's of one end of R35, capacitor C17, the anode of diode D8 and the second transformer T2
One end electrical connection, the other end and resistance R34 of capacitor C17, one end electrical connection of R35, resistance R34, the other end of R35, two poles
The cathode of pipe D8, one end of capacitor CE5-CE7, one end of resistance R32, R33 and common mode inductance LF3 first input end be electrically connected
It connects, the first output end and output cathode the interface electrical connection of common mode inductance LF3, the second output terminal and output of common mode inductance LF3
The electrical connection of cathode interface, the other end of vice-side winding Ns, the other end of capacitor CE5-CE7, the resistance R32 of the second transformer T2,
The other end of R33 and the second input end grounding of common mode inductance LF3, capacitor CE5-CE7 is by capacitor CE5, capacitor CE6 and capacitor
CE7 is composed in parallel, and resistance R32, R33 are composed in parallel by resistance R32 and resistance R33, and resistance R34, R35 is by resistance R34 and resistance
R35 is composed in parallel.
Preferably, the input rectifying filter circuit includes protective tube F1, thermistor NTC, varistor MOV1, common mode
Inductance LF1, LF2, safety capacitor CX1, bridge rectifier D B1 and resistance R1, R2, fire-wire interfaces successively with protective tube F1, temperature-sensitive
Resistance NTC series connection, first input end and thermistor the NTC electrical connection of common mode inductance LF1, the second input of common mode inductance LF1
End and zero line interface electrical connection, one end electrical connection of the first output end and varistor MOV1 of common mode inductance LF1, common mode inductance
The second output terminal of LF1 and the other end electrical connection of varistor MOV1, safety capacitor CX1 and varistor MOV1 are in parallel, electricity
It hinders after R1 and resistance R2 series connection and safety capacitor CX1 is in parallel, the one of the first input end of common mode inductance LF2 and safety capacitor CX1
The other end electrical connection of end electrical connection, the second input terminal of common mode inductance LF2 and safety capacitor CX1, the of bridge rectifier D B1
The first output end of one ac input end and common mode inductance LF2 electrical connection, the second ac input end of bridge rectifier D B1 and altogether
The second output terminal of mould inductance LF2 is electrically connected, the direct-flow positive pole of bridge rectifier D B1, one end of capacitor C1 and the first transformer
One end of the primary side winding of T1 is electrically connected, the direct current cathode ground connection of bridge rectifier D B1.
Preferably, the power supply circuit include diode D1, D5, D6, resistance R6, R7, R21, R26, R27 and capacitor C14,
CE3, CE4, the anode of diode D1 are electrically connected between resistance R1 and resistance R2, and the cathode of diode D1 is sequentially connected in series resistance
It is electrically connected after R6, R7 with the cathode of diode D5, the control VCC2 pin of chip MCU2, one end of capacitor C14, capacitor CE3
The electrical connection of the cathode of one end and diode D5, the cathode of the anode of diode D5, one end of capacitor CE4 and diode D6 are electrically connected
It connects, the anode of diode D6 is sequentially connected in series after resistance R26, R27 and one end of the primary side winding Naux of the second transformer T2 is electrically connected
It connects, the ZCD pin electrical connection of one end of resistance R21 and control chip MCU2, the other end of resistance R21 and the second transformer T2's
One end of primary side winding Naux is electrically connected, the other end of the primary side winding Naux of the second transformer T2, capacitor C14 the other end,
The other end of capacitor CE3 and the other end ground connection of capacitor CE4.
Preferably, the control circuit further include resistance R3, R5, R8, R10, R11, R12, R4, R23, R22 and capacitor C2,
One end of the vice-side winding of C4, C5, C8, C3, C11, C12, one end of resistance R3 and the first transformer T1 is electrically connected, resistance R3's
The ZCD pin electrical connection of the other end, one end of capacitor C2 and control chip MCU1, one end of resistance R10 and the first transformer T1
Primary side winding other end electrical connection, the other end of resistance R10 is sequentially connected in series after resistance R11, R12 and control chip MCU1
The electrical connection of MULT pin, one end of capacitor C4, one end of resistance R5 and the MULT pin electrical connection for controlling chip MCU1, resistance R8
One end, capacitor C8 one end and control the COMP pin electrical connection of chip MCU1, one end of the other end of capacitor C8, capacitor C5
With the INV pin electrical connection of control chip MCU1, the other end electrical connection of the other end and resistance R8 of capacitor C5；
One end of resistance R4, one end of capacitor C3 and the CS pin electrical connection for controlling chip MCU1, the other end of resistance R4
It being electrically connected with one end of resistance RS2, the other end of the GND pin and capacitor C3 that control chip MCU1 is grounded, and the one of resistance R23
The CS pin electrical connection at end, one end of capacitor C12 and control chip MCU2, one end of resistance R22, one end of capacitor C11 and control
The ZCD pin of coremaking piece MCU2 is electrically connected, one end electrical connection of the other end and resistance RS4 of resistance R23, the first transformer T1's
The other end of vice-side winding, the other end of capacitor C2, the other end of capacitor C4, the other end of capacitor C12, resistance R22 it is another
The other end ground connection at end, the other end of capacitor C11 and resistance R5.
The Switching Power Supply that chip can be automatically shut down when the low-load, based on Flyback (flyback) and Boost (boosting) structure
Frame topology, which is built, has the control circuit for automatically shutting down chip functions, and there are two the control chips of discrete for this Switching Power Supply tool
MCU1, MCU2, to respectively drive the switching tube Q2 of switching tube Q1 and flyback switching circuit in booster circuit, control circuit is low
By automatically shutting down control chip MCU1, MCU2 when load, the scattered consumption of the complete machine idle work of Switching Power Supply is efficiently reduced, is promoted
Overall efficiency.
Detailed description of the invention
The present invention will be further described for attached drawing, but the content in attached drawing does not constitute any limitation of the invention.
Fig. 1 is the switching power circuit configuration diagram of the one of embodiment of the present invention；
Fig. 2 is the Switching Power Supply integrated circuit figure of the one of embodiment of the present invention；
Fig. 3 is the control circuit part-structure figure of the one of embodiment of the present invention；
Fig. 4 is the flyback switching circuit structure figure of the one of embodiment of the present invention；
Fig. 5 is the input rectifying filter circuit construction figure of the one of embodiment of the present invention；
Fig. 6 is the power supply circuit construction figure of the one of embodiment of the present invention；
Fig. 7 is the output regulator rectifier circuit part-structure figure of the one of embodiment of the present invention；
Fig. 8 is the output regulator rectifier circuit overall structure figure of the one of embodiment of the present invention；
Fig. 9 is control circuit another part structure chart of the one of embodiment of the present invention.
Wherein: input rectifying filter circuit 1；Booster circuit 2；Flyback switching circuit 3；Export regulator rectifier circuit 4；Control
Circuit 5；Power supply circuit 6.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
The Switching Power Supply that chip can be automatically shut down when the low-load of the present embodiment, as shown in Figure 1, including that input rectifying filters
Circuit 1, booster circuit 2, flyback switching circuit 3, output regulator rectifier circuit 4, control circuit 5 and power supply circuit 6, input rectifying
The input terminal of filter circuit 1 accesses alternating current, and the output end of input rectifying filter circuit 1 and the input terminal of booster circuit 2 are electrically connected,
The output end electrical connection of the input terminal and booster circuit 2 of flyback switching circuit 3, the output end of the flyback switching circuit 3, power supply
The input terminal electrical connection of the input terminal of circuit 6 and output regulator rectifier circuit 4, the output end of power supply circuit 6 and control circuit 5
Input terminal electrical connection, the input terminal electricity of the output end of the control circuit 5, the input terminal of flyback switching circuit 3 and booster circuit 2
Connection；
As shown in Figure 2 and Figure 3, the control circuit 5 includes control chip MCU1, MCU2, capacitor C15, C6, Cj, CE2, two
Pole pipe Dx1, Dx2, resistance Rx1, Rx2, Rx3, Rx4, NPN type triode Qx1, PNP type triode Qx2 and phototriode U4A,
The control chip MCU1 is that OB6563 controls chip, and the control chip MCU2 is that LD5523 controls chip；
The output end electrical connection of the VCC2 pin and power supply circuit 6 of the control chip MCU2, controls the DRV of chip MCU2
The switching tube Q2 of pin and flyback switching circuit 3 is electrically connected with driving switch pipe Q2, the capacitor C15 and phototriode U4A
It is parallel between the COMP pin and GND pin of the control chip MCU2, and the GND pin of the control chip MCU2 connects
Ground, one end that capacitor C15 is connected with the COMP pin of control chip MCU2 are defined as node Vcomp, control the VCC2 of chip MCU2
Pin is defined as node VCC2；
The VOUT pin of the control chip MCU1 and the switching tube Q1 of booster circuit 2 are electrically connected with driving switch pipe Q1,
The collector for controlling the VIN pin of chip MCU1, one end of capacitor C6, one end of capacitor CE2 and PNP type triode Qx2
Electrical connection, one end electrical connection of the emitter and resistance Rx1 of the PNP type triode Qx2, the other end, the electricity of the resistance Rx1
Hinder one end and the node VCC2 electrical connection of Rx2, the other end of the resistance Rx2, the base stage of PNP type triode Qx2 and NPN type three
The collector of pole pipe Qx1 is electrically connected, the base stage of the NPN type triode Qx1, one end of capacitor Cj, one end of resistance Rx4 and electricity
One end electrical connection of Rx3 is hindered, the other end of the resistance Rx3 and the cathode of diode Dx1 are electrically connected, the diode Dx1's
The cathode of anode and diode Dx2 are electrically connected, the anode and node V of the diode Dx2compElectrical connection, three pole of NPN type
The emitter of pipe Qx1, the other end of capacitor CE2, the other end of resistance Rx4, the other end of capacitor C6 and capacitor Cj the other end
Ground connection.
The Switching Power Supply that chip can be automatically shut down when the low-load, based on Flyback (flyback) and Boost (boosting) structure
Frame topology, which is built, has the control circuit 5 for automatically shutting down chip functions, and there are two the control chips of discrete for this Switching Power Supply tool
MCU1, MCU2, to respectively drive the switching tube Q2 of switching tube Q1 and flyback switching circuit 3 in booster circuit 2, control circuit 5
Chip MCU1, MCU2 are controlled by automatically shutting down in low-load, efficiently reduces the scattered consumption of the complete machine idle work of Switching Power Supply,
Promote overall efficiency.
Working principle is as follows: after Switching Power Supply connects alternating current, control chip MCU2 starts to work normally, at this point, capacitor C15
The COMP pin Injection Current of controlled coremaking piece MCU2, the voltage of capacitor C15 rise gradually；Control the COMP pin of chip MCU2
Under capacitor C15 voltage swing depend on complete machine bearing power percentage, such as:
In 100% load, the voltage of capacitor C15 is 3.1V；
In 50% load, the voltage of capacitor C15 is 1.8V；
In 20% load, the voltage of capacitor C15 is 1.2V；
In 0% load, the voltage of capacitor C15 is 0.65V.
When controlling chip MCU2 in 100% load, the voltage of capacitor C15 is 3.1V, at this time diode Dx1 and diode
Dx2 forward conduction (diode Dx1, Dx2 forward conduction voltage is 0.7V), NPN type triode Qx1 is biased one because of its base stage
Voltage, NPN type triode Qx1 conducting, the node V1 voltage where the collector of NPN type triode Qx1 are approximately equal to 0V；Positive-negative-positive
Triode Qx2 is because its base potential is pulled low, PNP type triode Qx2 conducting, to charge to capacitor CE2, when capacitor CE2's
Voltage reaches the cut-in voltage of control chip MCU1, and control chip MCU1 starts to work；Control chip MCU1, MCU2 has been at this time
It runs simultaneously.
When controlling chip MCU2 in 20% load, the voltage of capacitor C15 is 1.2V, at this time diode Dx1 and diode
Dx2 forward direction cut-off (diode Dx1, Dx2 forward conduction voltage is 0.7V), NPN type triode Qx1 appoints because its base stage does not bias
What electric signal, NPN type triode Qx1 cut-off, the node V1 voltage where the collector of NPN type triode Qx1 are approximately equal to node
The voltage of VCC2；PNP type triode Qx2 is because its base stage is by one level identical with its emitter of biasing, PNP type triode
Qx2 cut-off, capacitor CE2 level are 0V, therefore control chip MCU1 and be in closing chip status；Control chip MCU1 stops at this time
Work, control chip MCU2 run work.
Therefore, control circuit 5 is by the forward conduction voltage drop of diode Dx1 and diode Dx2 and node VcompVoltage
Vcomp is compared:
It as Vdx1+Vdx2 >=Vcomp, controls chip MCU1 and stops working, control chip MCU2 is worked normally；
As Vdx1+Vdx2 < Vcomp, chip MCU1 is controlled, control chip MCU2 runs work simultaneously；
Wherein, Vdx1, Vdx2 are respectively diode Dx1, the forward conduction voltage drop of Dx2.
Preferably, as shown in Figure 2, Figure 4 shows, the booster circuit 2 include switching tube Q1, the first transformer T1, capacitor C1,
C9, diode D2, D3A and resistance RS1, RS2, RS3, R17, R18, R19, one end of capacitor C1, input rectifying filter circuit 1
One end of the primary side winding of output end and the first transformer T1 is electrically connected, the other end ground connection of capacitor C1, and the switching tube Q1 is
Metal-oxide-semiconductor, the drain electrode of the switching tube Q1, the anode of diode D3A, one end of capacitor C9 and the first transformer T1 primary side winding
Other end electrical connection, the input terminal electrical connection of the cathode of diode D3A and flyback switching circuit 3, source electrode, the electricity of switching tube Q1
Hold one end electrical connection of the other end of C9, one end of resistance RS2 and resistance RS3, the grid of switching tube Q1, resistance R17 one end,
One end of resistance R18 and one end electrical connection of resistance R19, the anode of diode D2 and the other end of resistance R17 are electrically connected, two poles
The cathode of pipe D2, the other end of resistance R18 and the VOUT pin electrical connection for controlling chip MCU1, the other end and electricity of resistance R19
Hinder one end electrical connection of RS1, the other end ground connection of the other end of resistance RS1, the other end of resistance RS2 and resistance RS3.
Booster circuit 2 mainly filters input rectifying by switching tube Q1, the first transformer T1, capacitor C1 and diode D3A
The output of wave circuit 1 carries out boosting processing, and controls chip MCU1 and pass through foregoing circuit driving switch pipe Q1, regulating switch pipe Q1
Duty ratio.Capacitor C1 and diode D3A also realizes rectification and filtering respectively.
Preferably, as shown in Figure 2, Figure 4 shows, the flyback switching circuit 3 includes switching tube Q2, the second transformer T2, capacitor
C10, resistance RS4, RS5, RS6, R20, R24, R25 and diode D4, the switching tube Q2 are metal-oxide-semiconductor, the diode D3A's
One end of the primary side winding Np of cathode and the second transformer T2 is electrically connected, the drain electrode of the switching tube Q2, one end of capacitor C10 and
The other end of the primary side winding Np of second transformer T2 is electrically connected, the other end and resistance of the source electrode of switching tube Q2, capacitor C10
One end of RS5 is electrically connected, the grid of switching tube Q2, one end of resistance R20, one end of resistance R24 and resistance R25 one end be electrically connected
It connects, the anode electrical connection of the other end and diode D4 of resistance R24, the cathode of diode D4, the other end of resistance R25 and control
The DRV pin of chip MCU2 is electrically connected, one end electrical connection of the other end of resistance R20, one end of resistance RS4 and resistance RS6, electricity
Hinder the other end ground connection of the other end of RS4, the other end of resistance RS5 and resistance RS6.Foregoing circuit is built so that control chip
MCU2 driving switch pipe Q2 adjusts the duty ratio of the switching tube Q2 in flyback switching circuit 3.
Preferably, as shown in Figure 2, Figure 4 shows, the flyback switching circuit 3 further include diode D7, capacitor CE1, C16, C7,
Resistance R13A, R13B, R14, R15, R116, R28, R29, R30, R31, one end of resistance R13A, one end of capacitor CE1, capacitor
The cathode electrical connection of one end of C16, one end of resistance R29, one end of resistance R30, one end of resistance R31 and diode D3A, electricity
Resistance R13A is successively grounded with after resistance R13B, R14, R15, R116 series connection, is grounded after capacitor C7 and resistance R116 parallel connection, capacitor
The other end of CE1 is grounded, the other end of capacitor C16, the other end of resistance R29, the other end of resistance R30, resistance R31 it is another
The cathode of end and diode D7 are electrically connected, and the anode of diode D7 and one end of resistance R28 are electrically connected, the other end of resistance R28
With the other end electrical connection of the primary side winding Np of the second transformer T2 of electrical connection.Resistance R13A, R13B, R14, R15, R116 and electricity
Hold the Voltage Feedback system of the pairs of booster circuit 2 of C7 group.
Preferably, as shown in Fig. 2, Fig. 7, the output regulator rectifier circuit 4 includes capacitor C17, CE5-CE7, common mode electricity
Feel LF3, diode D8 and resistance R32, R33, R34, one end of R35, capacitor C17, the anode of diode D8 and the second transformer
One end of the vice-side winding Ns of T2 is electrically connected, the other end and resistance R34 of capacitor C17, one end electrical connection of R35, resistance R34,
The other end of R35, the cathode of diode D8, one end of capacitor CE5-CE7, one end of resistance R32, R33 and common mode inductance LF3
First input end electrical connection, the first output end and output cathode the interface electrical connection of common mode inductance LF3, the of common mode inductance LF3
Two output ends and the electrical connection of output negative pole interface, the other end of the vice-side winding Ns of the second transformer T2, capacitor CE5-CE7 it is another
One end, the other end of resistance R32, R33 and common mode inductance LF3 the second input end grounding, capacitor CE5-CE7 is by capacitor CE5, electricity
Hold CE6 and capacitor CE7 to compose in parallel, resistance R32, R33 are composed in parallel by resistance R32 and resistance R33, and resistance R34, R35 is by electricity
Resistance R34 and resistance R35 is composed in parallel.
Above-mentioned partial circuit is built, diode D8 is first passed through and is rectified, then by capacitor CE5-CE7 and common mode inductance
LF3 composition output filtering, realizes rectification, the filter function of output regulator rectifier circuit 4.And the switching tube Q2, second become
Depressor T2, diode D8 and capacitor CE5-CE7 form Flyback flyback topology circuit.Resistance R28, R29, R30, R31, capacitor
Peak absorbing system in C16 and diode D7 composition Flyback flyback topology circuit.
Preferably, as shown in Fig. 2, Fig. 8, the output regulator rectifier circuit 4 further include resistance R36, R37, R38, R39,
R40, R41, capacitor C18, zener diode ZD1, adjustable voltage stabilizer U3 and optocoupler U4B, one end of resistance R36, resistance R40 one
The first input end of end and common mode inductance LF3 are electrically connected, the cathode electrical connection of the other end and zener diode ZD1 of resistance R40,
The anode electrical connection of the anode of zener diode ZD1, one end of resistance R41 and optocoupler U4B, cathode, the resistance R41 of optocoupler U4B
The other end, one end of resistance R39 and the anode electrical connection of adjustable voltage stabilizer U3, the one of the other end of resistance R36, capacitor C18
The reference end electrical connection at end, one end of resistance R37, one end of resistance R38 and adjustable voltage stabilizer U3, the other end of resistance R39 and
The other end of capacitor C18 is electrically connected, another termination of the cathode of adjustable voltage stabilizer U3, the other end of resistance R37 and resistance R38
Ground, adjustable voltage stabilizer U3 are to export adjustable accurate reference voltage to integrate electricity AZ431-A.
Adjustable voltage stabilizer U3 is supplied electricity to by resistance R40 and zener diode ZD1 in above-mentioned partial circuit, by resistance R36,
R37 and R38 forms sampled voltage network, then is compared by the reference voltage of sampled voltage and adjustable voltage stabilizer U3 to control optocoupler
U4B, to reach voltage regulation result；The working principle of adjustable voltage stabilizer U3 is the reference voltage of sampled voltage and adjustable voltage stabilizer U3
Compare, when then adjustable voltage stabilizer U3 is not turned on reference voltage of the sampled voltage less than adjustable voltage stabilizer U3；When sampled voltage is greater than
Then adjustable voltage stabilizer U3 is connected the reference voltage of adjustable voltage stabilizer U3, feeds back a signal to optocoupler U4B.
Preferably, as shown in Fig. 2, Fig. 5, the input rectifying filter circuit 1 includes protective tube F1, thermistor NTC, pressure
Quick resistance MOV1, common mode inductance LF1, LF2, safety capacitor CX1, bridge rectifier D B1 and resistance R1, R2, fire-wire interfaces are successively
It connects with protective tube F1, thermistor NTC, first input end and thermistor the NTC electrical connection of common mode inductance LF1, common mode electricity
Feel the second input terminal and zero line interface electrical connection, the first output end of common mode inductance LF1 and one end of varistor MOV1 of LF1
The other end electrical connection of electrical connection, the second output terminal of common mode inductance LF1 and varistor MOV1, safety capacitor CX1 and pressure-sensitive
Resistance MOV1 is in parallel, and after resistance R1 and resistance R2 series connection and safety capacitor CX1 is in parallel, the first input end of common mode inductance LF2 and
One end of safety capacitor CX1 is electrically connected, the other end electrical connection of the second input terminal and safety capacitor CX1 of common mode inductance LF2, bridge
The electrical connection of the first output end of the first ac input end of formula rectifier DB1 and common mode inductance LF2, the of bridge rectifier D B1
The second output terminal of two ac input ends and common mode inductance LF2 electrical connection, the direct-flow positive pole of bridge rectifier D B1, capacitor C1
One end of the primary side winding of one end and the first transformer T1 is electrically connected, the direct current cathode ground connection of bridge rectifier D B1.It builds above-mentioned
Input rectifying filter circuit 1, first the alternating current of access is filtered, common mode inductance LF1, LF2 may filter that the electromagnetism of common mode is dry
Disturb signal；Then it is rectified by bridge rectifier D B1.
Preferably, as shown in Fig. 2, Fig. 6, the power supply circuit 6 include diode D1, D5, D6, resistance R6, R7, R21,
R26, R27 and capacitor C14, CE3, CE4, the anode of diode D1 are electrically connected between resistance R1 and resistance R2, diode D1's
Cathode is sequentially connected in series after resistance R6, R7 and the electrical connection of the cathode of diode D5, controls VCC2 pin, the capacitor C14 of chip MCU2
One end, capacitor CE3 one end and diode D5 cathode electrical connection, the anode of diode D5, one end of capacitor CE4 and two poles
The cathode of pipe D6 is electrically connected, and the anode of diode D6 is sequentially connected in series after resistance R26, R27 and the primary side winding of the second transformer T2
One end of Naux is electrically connected, one end of resistance R21 and the ZCD pin electrical connection of control chip MCU2, the other end of resistance R21 and
One end of the primary side winding Naux of second transformer T2 is electrically connected, the other end, the electricity of the primary side winding Naux of the second transformer T2
Hold the other end ground connection of the other end of C14, the other end of capacitor CE3 and capacitor CE4.The power supply circuit 6 is used for as control electricity
Road 5 powers.
Preferably, as shown in Fig. 2, Fig. 9, the control circuit 5 further include resistance R3, R5, R8, R10, R11, R12, R4,
The one of the vice-side winding of R23, R22 and capacitor C2, C4, C5, C8, C3, C11, C12, one end of resistance R3 and the first transformer T1
End electrical connection, the other end of resistance R3, one end of capacitor C2 and the ZCD pin electrical connection for controlling chip MCU1, the one of resistance R10
The other end electrical connection of the primary side winding of end and the first transformer T1, after the other end of resistance R10 is sequentially connected in series resistance R11, R12
With the MULT pin electrical connection of control chip MCU1, one end of capacitor C4, one end of resistance R5 and the MULT for controlling chip MCU1
Pin electrical connection, one end of resistance R8, one end of capacitor C8 and the COMP pin electrical connection for controlling chip MCU1, capacitor C8's is another
The INV pin electrical connection of one end, one end of capacitor C5 and control chip MCU1, the other end of capacitor C5 and the other end of resistance R8
Electrical connection, one end of resistance R4, one end of capacitor C3 and control chip MCU1 CS pin electrical connection, the other end of resistance R4 and
One end of resistance RS2 is electrically connected, and the other end of the GND pin and capacitor C3 that control chip MCU1 is grounded, one end of resistance R23,
One end of capacitor C12 and the CS pin electrical connection of control chip MCU2, one end of resistance R22, one end of capacitor C11 and control core
The ZCD pin of piece MCU2 is electrically connected, one end electrical connection of the other end and resistance RS4 of resistance R23, the secondary side of the first transformer T1
The other end of winding, the other end of capacitor C2, the other end of capacitor C4, the other end of capacitor C12, the other end of resistance R22, electricity
Hold the other end of C11 and the other end ground connection of resistance R5.
The technical principle of the invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, the technology of this field
Personnel can associate with other specific embodiments of the invention without creative labor, these modes are fallen within
Within protection scope of the present invention.
Claims (9)
1. the Switching Power Supply that chip can be automatically shut down when a kind of low-load, including input rectifying filter circuit, booster circuit, flyback
Switching circuit, output regulator rectifier circuit, control circuit and power supply circuit, the input terminal of input rectifying filter circuit access city
Electricity, the input terminal electrical connection of the output end and booster circuit of input rectifying filter circuit, the input terminal and liter of flyback switching circuit
The output end of volt circuit is electrically connected, the output end of the flyback switching circuit, the input terminal of power supply circuit and output rectifying and voltage-stabilizing
The input terminal of circuit is electrically connected, the output end of power supply circuit and the input terminal electrical connection of control circuit, the control circuit it is defeated
The input terminal of outlet, the input terminal of flyback switching circuit and booster circuit is electrically connected, it is characterised in that:
The control circuit includes control chip MCU1, MCU2, capacitor C15, C6, Cj, CE2, diode Dx1, Dx2, resistance
Rx1, Rx2, Rx3, Rx4, NPN type triode Qx1, PNP type triode Qx2 and phototriode U4A, the control chip MCU1
Chip is controlled for OB6563, the control chip MCU2 is that LD5523 controls chip；
The output end electrical connection of the VCC2 pin and power supply circuit of the control chip MCU2, controls the DRV pin of chip MCU2
It is electrically connected with the switching tube Q2 of flyback switching circuit and is parallel to driving switch pipe Q2, the capacitor C15 and phototriode U4A
Between the COMP pin and GND pin of the control chip MCU2, and the GND pin ground connection of the control chip MCU2, electricity
Hold one end that C15 is connected with the COMP pin of control chip MCU2 and is defined as node Vcomp, control the VCC2 pin of chip MCU2
It is defined as node VCC2；
The VOUT pin of the control chip MCU1 and the switching tube Q1 of booster circuit are electrically connected with driving switch pipe Q1, the control
The collector electrical connection of the VIN pin of coremaking piece MCU1, one end of capacitor C6, one end of capacitor CE2 and PNP type triode Qx2,
The electrical connection of one end of the emitter of the PNP type triode Qx2 and resistance Rx1, the other end of the resistance Rx1, resistance Rx2
One end and node VCC2 electrical connection, the other end of the resistance Rx2, the base stage of PNP type triode Qx2 and NPN type triode Qx1
Collector electrical connection, the base stage of the NPN type triode Qx1, one end of capacitor Cj, one end of resistance Rx4 and resistance Rx3
One end electrical connection, the cathode electrical connection of the other end and diode Dx1 of the resistance Rx3, the anode of the diode Dx1 and two
The cathode of pole pipe Dx2 is electrically connected, the anode and node V of the diode Dx2compElectrical connection, the NPN type triode Qx1's
The other end ground connection of emitter, the other end of capacitor CE2, the other end of resistance Rx4, the other end of capacitor C6 and capacitor Cj.
2. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 1, it is characterised in that: the boosting
Circuit include switching tube Q1, the first transformer T1, capacitor C1, C9, diode D2, D3A and resistance RS1, RS2, RS3, R17,
R18, R19, one end of capacitor C1, the output end of input rectifying filter circuit and the first transformer T1 primary side winding one end electricity
Connection, the other end ground connection of capacitor C1, the switching tube Q1 is metal-oxide-semiconductor, and the drain electrode of the switching tube Q1, diode D3A are just
The other end of the primary side winding of pole, one end of capacitor C9 and the first transformer T1 is electrically connected, and the cathode and flyback of diode D3A is opened
The input terminal on powered-down road is electrically connected, the source electrode of switching tube Q1, the other end of capacitor C9, one end of resistance RS2 and resistance RS3 one
End electrical connection, one end electrical connection of the grid of switching tube Q1, one end of resistance R17, one end of resistance R18 and resistance R19, two poles
The anode of pipe D2 and the other end of resistance R17 are electrically connected, the cathode of diode D2, the other end of resistance R18 and control chip
The VOUT pin of MCU1 is electrically connected, one end electrical connection of the other end and resistance RS1 of resistance R19, the other end, the electricity of resistance RS1
Hinder the other end of RS2 and the other end ground connection of resistance RS3.
3. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 2, it is characterised in that: the flyback
Switching circuit includes switching tube Q2, the second transformer T2, capacitor C10, resistance RS4, RS5, RS6, R20, R24, R25 and diode
D4, the switching tube Q2 are metal-oxide-semiconductor, one end electricity of the primary side winding Np of the cathode of the diode D3A and the second transformer T2
Connection, the other end of the primary side winding Np of the drain electrode of the switching tube Q2, one end of capacitor C10 and the second transformer T2 are electrically connected
It connects, one end electrical connection of the source electrode of switching tube Q2, the other end of capacitor C10 and resistance RS5, grid, the resistance R20 of switching tube Q2
One end, resistance R24 one end and resistance R25 one end electrical connection, the other end of resistance R24 and the anode of diode D4 are electrically connected
It connects, the cathode of diode D4, the other end of resistance R25 and the DRV pin electrical connection for controlling chip MCU2, resistance R20's is another
One end electrical connection at end, one end of resistance RS4 and resistance RS6, the other end and resistance of the other end of resistance RS4, resistance RS5
The other end of RS6 is grounded.
4. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 3, it is characterised in that: the flyback
Switching circuit further include diode D7, capacitor CE1, C16, C7, resistance R13A, R13B, R14, R15, R116, R28, R29, R30,
R31, one end of resistance R13A, one end of capacitor CE1, one end of capacitor C16, one end of resistance R29, one end of resistance R30, electricity
One end of R31 and the cathode electrical connection of diode D3A are hindered, resistance R13A is successively and after resistance R13B, R14, R15, R116 series connection
It is grounded after ground connection, capacitor C7 and resistance R116 are in parallel, the other end ground connection of capacitor CE1, the other end of capacitor C16, resistance R29
The cathode electrical connection of the other end, the other end of resistance R30, the other end of resistance R31 and diode D7, the anode of diode D7 and
One end of resistance R28 is electrically connected, the other end electricity of the primary side winding Np of the second transformer T2 of the other end and electrical connection of resistance R28
Connection.
5. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 4, it is characterised in that: the output
Regulator rectifier circuit includes capacitor C17, CE5-CE7, common mode inductance LF3, diode D8 and resistance R32, R33, R34, R35, electricity
Hold one end electrical connection of the vice-side winding Ns of one end of C17, the anode of diode D8 and the second transformer T2, capacitor C17's is another
One end and resistance R34, one end electrical connection of R35, resistance R34, the other end of R35, the cathode of diode D8, capacitor CE5-CE7
One end, resistance R32, R33 one end and common mode inductance LF3 first input end electrical connection, common mode inductance LF3 first output
End and the electrical connection of output cathode interface, second output terminal and output negative pole the interface electrical connection of common mode inductance LF3, the second transformer
The other end of vice-side winding Ns of T2, the other end of capacitor CE5-CE7, the other end of resistance R32, R33 and common mode inductance LF3
Second input end grounding, capacitor CE5-CE7 are composed in parallel by capacitor CE5, capacitor CE6 and capacitor CE7, and resistance R32, R33 is by electricity
Resistance R32 and resistance R33 is composed in parallel, and resistance R34, R35 is composed in parallel by resistance R34 and resistance R35.
6. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 5, it is characterised in that: the output
Regulator rectifier circuit further includes resistance R36, R37, R38, R39, R40, R41, capacitor C18, zener diode ZD1, adjustable pressure stabilizing
The first input end of one end of device U3 and optocoupler U4B, resistance R36, one end of resistance R40 and common mode inductance LF3 is electrically connected, resistance
The cathode electrical connection of the other end and zener diode ZD1 of R40, the anode of zener diode ZD1, one end of resistance R41 and light
The anode electrical connection of coupling U4B, the cathode of optocoupler U4B, the other end of resistance R41, one end of resistance R39 and adjustable voltage stabilizer U3
Anode electrical connection, the other end of resistance R36, one end of capacitor C18, one end of resistance R37, one end of resistance R38 and adjustable steady
The reference end of depressor U3 is electrically connected, the other end electrical connection of the other end and capacitor C18 of resistance R39, the yin of adjustable voltage stabilizer U3
The other end of pole, the other end of resistance R37 and resistance R38 is grounded, and adjustable voltage stabilizer U3 is to export adjustable accurate benchmark electricity
Potential source integrates electricity AZ431-A.
7. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 6, it is characterised in that: the input
Current rectifying and wave filtering circuit includes protective tube F1, thermistor NTC, varistor MOV1, common mode inductance LF1, LF2, safety capacitor
CX1, bridge rectifier D B1 and resistance R1, R2, fire-wire interfaces are successively connected with protective tube F1, thermistor NTC, common mode inductance
The first input end and thermistor NTC of LF1 is electrically connected, the second input terminal and the zero line interface electrical connection of common mode inductance LF1, altogether
The electrical connection of one end of the first output end of mould inductance LF1 and varistor MOV1, the second output terminal of common mode inductance LF1 and pressure-sensitive
After the other end electrical connection of resistance MOV1, safety capacitor CX1 and varistor MOV1 parallel connection, resistance R1 and resistance R2 series connection and pacify
Capacitor CX1 parallel connection is advised, the first input end of common mode inductance LF2 and one end of safety capacitor CX1 are electrically connected, common mode inductance LF2's
The electrical connection of the other end of second input terminal and safety capacitor CX1, the first ac input end and common mode inductance of bridge rectifier D B1
The first output end of LF2 is electrically connected, the second ac input end of bridge rectifier D B1 and the second output terminal of common mode inductance LF2
Electrical connection, one end of the primary side winding of the direct-flow positive pole of bridge rectifier D B1, one end of capacitor C1 and the first transformer T1 is electrically connected
It connects, the direct current cathode ground connection of bridge rectifier D B1.
8. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 7, it is characterised in that: the power supply
Circuit includes diode D1, D5, D6, resistance R6, R7, R21, R26, R27 and capacitor C14, CE3, CE4, the anode of diode D1
It is electrically connected between resistance R1 and resistance R2, the cathode of diode D1 is sequentially connected in series after resistance R6, R7 and the cathode of diode D5
Electrical connection, the cathode for controlling the VCC2 pin of chip MCU2, one end of capacitor C14, one end of capacitor CE3 and diode D5 are electrically connected
It connects, the cathode electrical connection of the anode of diode D5, one end of capacitor CE4 and diode D6, the anode of diode D6 is sequentially connected in series
The electrical connection of after resistance R26, R27 and one end of the primary side winding Naux of the second transformer T2, one end of resistance R21 and control chip
The ZCD pin of MCU2 is electrically connected, one end electrical connection of the primary side winding Naux of the other end of resistance R21 and the second transformer T2,
The other end of primary side winding Naux of second transformer T2, the other end of capacitor C14, the other end of capacitor CE3 and capacitor CE4
Other end ground connection.
9. the Switching Power Supply that chip can be automatically shut down when low-load according to claim 8, it is characterised in that: the control
Circuit further includes resistance R3, R5, R8, R10, R11, R12, R4, R23, R22 and capacitor C2, C4, C5, C8, C3, C11, C12, electricity
Hinder R3 one end and the first transformer T1 vice-side winding one end electrical connection, the other end of resistance R3, one end of capacitor C2 and
The ZCD pin for controlling chip MCU1 is electrically connected, and the other end of the primary side winding of one end of resistance R10 and the first transformer T1 is electrically connected
It connects, the other end of resistance R10 is sequentially connected in series after resistance R11, R12 and the MULT pin electrical connection of control chip MCU1, capacitor C4
One end, resistance R5 one end and control chip MCU1 MULT pin electrical connection, one end of resistance R8, one end of capacitor C8 and
The COMP pin electrical connection of chip MCU1 is controlled, the INV of the other end of capacitor C8, one end of capacitor C5 and control chip MCU1 draws
Foot electrical connection, the other end electrical connection of the other end and resistance R8 of capacitor C5；
One end of resistance R4, one end of capacitor C3 and the CS pin electrical connection for controlling chip MCU1, the other end and electricity of resistance R4
One end electrical connection for hindering RS2 controls the GND pin of chip MCU1 and the other end ground connection of capacitor C3, one end of resistance R23, electricity
Hold one end of C12 and the CS pin electrical connection of control chip MCU2, one end of resistance R22, one end of capacitor C11 and control chip
The ZCD pin of MCU2 is electrically connected, one end electrical connection of the other end and resistance RS4 of resistance R23, the secondary side of the first transformer T1 around
Group the other end, the other end of capacitor C2, the other end of capacitor C4, the other end of capacitor C12, resistance R22 the other end, capacitor
The other end of C11 and the other end ground connection of resistance R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910735549.8A CN110417274A (en) | 2019-08-09 | 2019-08-09 | The Switching Power Supply that chip can be automatically shut down when a kind of low-load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910735549.8A CN110417274A (en) | 2019-08-09 | 2019-08-09 | The Switching Power Supply that chip can be automatically shut down when a kind of low-load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110417274A true CN110417274A (en) | 2019-11-05 |
Family
ID=68367080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910735549.8A Pending CN110417274A (en) | 2019-08-09 | 2019-08-09 | The Switching Power Supply that chip can be automatically shut down when a kind of low-load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110417274A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112558535A (en) * | 2021-02-25 | 2021-03-26 | 三门康创电子科技有限公司 | Oxygenerator control circuit, oxygenerator and oxygenerator control method |
-
2019
- 2019-08-09 CN CN201910735549.8A patent/CN110417274A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112558535A (en) * | 2021-02-25 | 2021-03-26 | 三门康创电子科技有限公司 | Oxygenerator control circuit, oxygenerator and oxygenerator control method |
| CN112558535B (en) * | 2021-02-25 | 2021-05-07 | 三门康创电子科技有限公司 | Oxygenerator control circuit, oxygenerator and oxygenerator control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101765274A (en) | LED lamp and drive circuit | |
| CN206595908U (en) | A kind of inverse-excitation type switch power-supply | |
| CN106704957A (en) | LED emergency lighting controlling device | |
| CN110166721B (en) | Staggered PFC (Power factor correction) constant-current direct drive circuit, driving power supply and television | |
| CN106655431B (en) | Automatic current regulation charger circuit | |
| WO2012100406A1 (en) | Power supply circuit with low-voltage control and producing method thereof | |
| CN110417274A (en) | The Switching Power Supply that chip can be automatically shut down when a kind of low-load | |
| CN209402781U (en) | A kind of ultra-thin photovoltaic intelligent dimming power control circuit | |
| CN101931317B (en) | Power supply start control circuit and power supply | |
| CN214045434U (en) | Power supply circuit with voltage stabilization control | |
| CN217037504U (en) | LED dimming circuit and dimming LED lamp | |
| CN213879374U (en) | Double-feedback single-phase online uninterrupted power supply system | |
| CN210781464U (en) | Constant-current LED drive circuit integrating emergency lighting | |
| CN210928078U (en) | Silicon controlled rectifier dimming circuit | |
| CN114340077A (en) | LED dimming circuit, dimming LED lamp and LED dimming method based on LED dimming circuit | |
| CN208623949U (en) | A kind of LED light source of the double light sources of twin voltage | |
| CN106787853A (en) | A kind of inverse-excitation type switch power-supply | |
| CN209593816U (en) | Linear voltage-stabilizing circuit and regulated power supply system | |
| CN206533297U (en) | A kind of novel intelligent multiplication of voltage controls circuit | |
| CN110366286B (en) | Double-driving circuit and LED lamp driving device | |
| CN210273838U (en) | Switching power supply with chip capable of being automatically turned off in low load | |
| CN208539799U (en) | A kind of AC conversion circuit based on experiment instruments used for education | |
| CN103973141A (en) | Full-direct-current variable frequency air conditioner supplied with electricity by using switching power supply circuit | |
| CN211352091U (en) | Stepless speed regulation control circuit | |
| CN209402418U (en) | A kind of flyback sourse circuit of constant pressure and flow feedback |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |