CN107040151A - A kind of power circuit for being used to power for control circuit and Switching Power Supply - Google Patents
A kind of power circuit for being used to power for control circuit and Switching Power Supply Download PDFInfo
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- CN107040151A CN107040151A CN201710372795.2A CN201710372795A CN107040151A CN 107040151 A CN107040151 A CN 107040151A CN 201710372795 A CN201710372795 A CN 201710372795A CN 107040151 A CN107040151 A CN 107040151A
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Classifications
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- 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
- H02M7/2173—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 biphase or polyphase circuit arrangement
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- 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
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Abstract
The invention discloses a kind of power circuit for being powered for control circuit and the Switching Power Supply including the power circuit.Power circuit includes main winding circuit, in addition to assists winding circuit and adjustment circuit.Under power circuit normal load state, only powered from the relatively low assists winding circuit of output voltage to control circuit, therefore reduce the overall power consumption of power circuit.And under power circuit underloading or Light Condition, control circuit is powered jointly by adjustment circuit and assists winding circuit, the power supply terminal voltage of control circuit is in control circuit can be in the voltage range of normal work.Power circuit provided by the present invention, the output voltage stabilization under light condition is low in energy consumption under normal load state, and circuit holistic cost is low.In addition, the Switching Power Supply including the power circuit equally has the effect above.
Description
Technical field
The present invention relates to power circuit design field, more particularly to a kind of power circuit for being used to power for control circuit
And Switching Power Supply.
Background technology
With the improvement of people's life quality, being increasingly ready to select with light modulation, toning, communication in work or life
The Intelligentized LED lighting lamp tool of function, this will be undoubtedly following main flow of middle high-power LED lamp, certainly will use driving electricity
Source is embedded with MCU or the control circuit of FPGA control chip to realize communication, light modulation or toning function.
To improve LED drive power efficiency, reduce the temperature rise inside driving power supply, middle high-power LED lamp is often used
" high voltage-small current " type of drive, i.e. LED drive power output voltage is higher.And control MCU, FPGA inside circuit to control core
Piece operating voltage is low, and this kind of control chip is high to power supply stability requirement, is easily caused when supply voltage is unstable
Control system operation exception or control chip reset.
Fig. 1 a kind of is used to be to control the power circuit diagram powered of circuit, main winding N for what prior art was providedS1Output electricity
Press VOHeight, makees the driving power supply of LED illumination chipset；Assists winding NS2Output voltage VCCIt is low, make the power supply of control circuit.But
When driving power supply is in underloading or Light Condition, assists winding NS2Output voltage VCCIt is relatively low, and stability is poor, controls circuit
Interior MCU tends not to normal work.
In order to solve the assists winding N under underloading or no-load condition of foregoing circuit presenceS2Output voltage is low, stability is poor
The problem of, some power circuits are using circuit connecting mode as shown in Figure 2 or Figure 3.Under the connected mode shown in Fig. 2, when
Assists winding NS2When output voltage is relatively low, main winding NS1Output voltage VOPowered by resistance R1 to control circuit, it is contemplated that main
Winding NS1Output voltage VOHeight, in assists winding NS2Output filter capacitor C2Two ends shunt regulator diode DZ, make control circuit
Power supply VCCIt is stable；Under the connected mode shown in Fig. 3, directly by LED driving voltages VOLinear serial regulating circuit is depressured, surely
Make the power supply of control circuit after pressure.But this two classes drive circuit power consumption is big, has had a strong impact on the efficiency of driving power supply, exacerbate interior
The temperature rise in portion.It can be seen that, circuit connecting mode as shown in Figures 2 and 3 be only applicable to control circuit average operating current less or
Main output voltage VORelatively low situation.
The connected mode schematic diagram for another power circuit that Fig. 4 provides for prior art.As shown in figure 4, main output electricity
Press VOIt is depressured through DC-DC converter, makees the power supply of control circuit after voltage stabilizing, it is big thoroughly to solve loss, and control circuit electricity
Source voltage VCCWith LED drive power voltage VOMismatch problem.But because DC-DC converter volume is big, cost is high, cause this
Circuit connecting mode is limited by very large in application.
As can be seen here there is provided output voltage stabilization in the case of a kind of underloading, the low power circuit of low in energy consumption and cost is this
Art personnel's urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of power circuit for being used to power for control circuit and Switching Power Supply, to reach
Under circuit normal load state or heavy condition, overall power is low；Under circuit light condition or Light Condition, output voltage is steady
Fixed purpose.
In order to solve the above technical problems, the present invention provides a kind of power circuit for being used to power for control circuit, including master
Winding circuit, in addition to assists winding circuit and adjustment circuit,
Assists winding circuit includes assists winding, the second diode, the second electric capacity；
Wherein, assists winding Same Name of Ends is connected with the positive pole of the second diode, the negative pole of the second diode and the second electric capacity
Positive pole is connected, and the second electric capacity negative pole is connected with the different name end of assists winding, and is grounded；
Adjustment circuit includes voltage-regulator diode, NPN type triode, first resistor and second resistance；
Wherein, one end of first resistor is connected with the negative pole of voltage-regulator diode, and connects the base stage of NPN type triode, surely
The plus earth of diode is pressed, the other end of first resistor is connected with one end of second resistance, and connects the whole of main winding circuit
Flow filtering output end, the other end of second resistance is connected with the colelctor electrode of NPN type triode, the emitter stage of NPN type triode and
Second capacitance cathode is connected, and the even power end of connection control circuit.
It is preferred that, further comprise the 4th diode, the positive pole of the 4th diode and the emitter stage phase of NPN type triode
Even, the negative pole of the 4th diode is connected with the second capacitance cathode.
It is preferred that, further comprise linear voltage-stabilizing circuit, one end of linear voltage-stabilizing circuit is connected with the positive pole of the second electric capacity,
The other end of linear voltage-stabilizing circuit is with controlling the power end of circuit to be connected.
It is preferred that, further comprise the 5th diode, the negative pole of the 5th diode is connected with the base stage of NPN type triode,
The positive pole of 5th diode is connected with the positive pole of the second electric capacity.
It is preferred that, further comprise 3rd resistor, one end of 3rd resistor is connected with the negative pole of the second diode, the 3rd electricity
The other end of resistance is connected with the positive pole of the second electric capacity.
It is preferred that, further comprise the 3rd electric capacity, the positive pole of the 3rd electric capacity is connected with the negative pole of the second diode, the 3rd electricity
The negative pole ground connection of appearance.
It is preferred that, the different name end of the main winding in main winding circuit is connected with the Same Name of Ends of assists winding.
It is preferred that, linear voltage-stabilizing circuit is specially the circuit being made up of linear Integrated voltage stabilizing chip, or be made up of TL431
Shunt regulating circuit or the mu balanced circuit being made up of diode.
In addition, the present invention also provides a kind of Switching Power Supply, including control circuit, in addition to it is above-mentioned for being supplied for control circuit
The power circuit of electricity.
The power circuit provided by the present invention for being used to power for control circuit, including main winding circuit, in addition to auxiliary
Winding circuit and adjustment circuit.Wherein, assists winding Same Name of Ends is connected with the positive pole of the second diode, the second diode it is negative
Pole is connected with the second capacitance cathode, and the second electric capacity negative pole is connected with the different name end of assists winding, and is grounded.First resistor one end with
Voltage-regulator diode negative pole is connected, and is connected to the base stage of NPN type triode, the plus earth of voltage-regulator diode.First resistor
The other end is connected with one end of second resistance, and connects the rectifying and wave-filtering output end of main winding, the other end and NPN of second resistance
The colelctor electrode of type triode is connected.The emitter stage of NPN type triode is connected with the second capacitance cathode, and is connected to control circuit
Power end.
Because in the state of power circuit normal load, the output voltage of assists winding circuit is higher, the second electric capacity is just
Pole tension causes NPN type triode to be ended higher than the voltage at NPN type triode base stage, prevents electric current from flowing through second resistance, enters
And only powered from the relatively low assists winding circuit of power output to control circuit, therefore reduce the overall power of power circuit.
And in the state of power circuit underloading or zero load, because the output voltage of assists winding circuit is low, cause NPN type triode to be led
It is logical, and then control circuit to be powered jointly by adjustment circuit and assists winding circuit, the power supply terminal voltage of control circuit is in control
Circuit can be in the voltage range of normal work.
It can be seen that, power circuit provided by the present invention, the output voltage stabilization under light condition, under normal load state
It is low in energy consumption, and circuit holistic cost is low.Because the Switching Power Supply that the present invention is provided includes above-mentioned power circuit, so same tool
There is above-mentioned beneficial effect.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly, the required accompanying drawing used in embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 for prior art provide it is a kind of be to control the power circuit powered of circuit；
Fig. 2 for prior art provide it is another be to control the power circuit powered of circuit；
Fig. 3 for prior art provide it is another be to control the power circuit powered of circuit；
Fig. 4 for prior art provide it is another be to control the power circuit powered of circuit；
Fig. 5 be it is provided in an embodiment of the present invention it is a kind of be to control the power circuit diagram powered of circuit；
Fig. 6 be it is provided in an embodiment of the present invention it is another be to control the power circuit diagram powered of circuit；
Fig. 7 be it is provided in an embodiment of the present invention it is another be to control the power circuit diagram powered of circuit；
Fig. 8 be it is provided in an embodiment of the present invention it is another be to control the power circuit diagram powered of circuit；
Fig. 9 be it is provided in an embodiment of the present invention it is another be to control the power circuit diagram powered of circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are not under the premise of creative work is made, and what is obtained is every other
Embodiment, belongs to the scope of the present invention.
The core of the present invention is to provide a kind of power circuit for being used to power for control circuit, in the circuit including adjustment
Circuit and assists winding circuit.In power circuit normal load state or heavy condition, only from assists winding circuit to control
Circuit is powered, to reach purpose that overall power is low；In power circuit light condition or Light Condition, by assists winding circuit
Powered jointly to control circuit with adjustment circuit, it is ensured that the power end voltage stabilization of control circuit, and then ensure that control electricity
The normal work of control chip inside road.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Embodiment one
Fig. 5 is a kind of power circuit diagram provided in an embodiment of the present invention.Refer to Fig. 5, power circuit include having it is main around
Group NS1Main winding circuit, in addition to assists winding circuit 1 and adjustment circuit 2, assists winding circuit 1 includes assists winding
NS2, the second diode D2, the second electric capacity C2；
Wherein, assists winding NS2Same Name of Ends be connected with the second diode D2 positive pole, the second diode D2 negative pole with
Second electric capacity C2Positive pole is connected, the second electric capacity C2Negative pole and assists winding NS2Different name end be connected, and be grounded；
Adjustment circuit 2 includes voltage-regulator diode Dz, NPN type triode Q1, first resistor R1 and second resistance R2；
Wherein, first resistor R1 one end is connected with voltage-regulator diode Dz negative pole, and connects NPN type triode Q1 base
Pole, voltage-regulator diode Dz plus earth, the first resistor R1 other end is connected with second resistance R2 one end, and connect it is main around
The rectifying and wave-filtering output end V of group circuitO, the second resistance R2 other end is connected with NPN type triode Q1 colelctor electrode, NPN type
Triode Q1 emitter stage and the second electric capacity C2Positive pole is connected, and the even power end V of connection control circuitCC。
In specific implementation, according to control circuit power end VCCReasonably select voltage-regulator diode Dz voltage of voltage regulation VZWith
And assists winding NS2The number of turn, make power circuit second electric capacity C under normal load or heavy condition2The voltage V of positive pole A pointsA
Higher than the voltage V of NPN type triode Q1 base stages B pointsB, and then end NPN type triode Q1, only by relatively low auxiliary of output voltage
Help winding circuit 1 to be powered to control circuit, reduce overall losses of the power circuit in heavy condition or normal load state.
It is in power circuit under underloading or Light Condition, assists winding output voltage declines, as A point voltages VACompare NPN
The voltage V of type triode Q1 basic points B pointsBDuring low more than 0.5V, NPN type triode Q1 conductings make A point voltages VAStabilization is in (VZ-
0.7) near V, control circuit is given to provide stable power supply, it is to avoid control circuit internal part causes because of electricity shortage
The phenomenon of operation exception.After NPN type triode Q1 conductings, its emitter current size and control circuit and assists winding circuit 1
The voltage V of outputAIt is relevant, equivalent to the rectifying and wave-filtering output end V in main winding circuitOWith the output voltage V of assists winding circuit 1A
Between a connected variable resistor, i.e. adjustment circuit 2 can be considered as a variable resistor.
As the more preferably scheme in the present embodiment, it can further increase by the 4th diode D4, as shown in fig. 6, the 4th
Diode D4 positive pole is connected with NPN type triode Q1 emitter stage, the 4th diode D4 negative pole and the second electric capacity C2Just
Extremely it is connected.4th diode D4 effect is to prevent power circuit in heavy condition, the output voltage V of assists winding circuit 1APartially
It is high and cause NPN type triode Q1 emitter junctions be reversed puncture and form high current and damage NPN type triode Q1 emitter junctions and
Voltage-regulator diode Dz, and for avoiding NPN type triode Q1 emitter junctions from reverse leakage current occur, causes assists winding electricity
The excess loss on road 1.
The power circuit that the present embodiment is provided, because it is in the state of normal load, the output of assists winding circuit
Voltage is higher, and the second capacitance cathode voltage causes NPN type triode to be ended higher than the voltage at NPN type triode base stage, prevents
By electric current in adjustment circuit, and then only powered from the relatively low assists winding circuit of power output to control circuit, therefore reduction
The overall power consumption of power circuit.And in the state of power circuit underloading or zero load, due to the output electricity of assists winding circuit
Force down, cause NPN type triode to turn on, and then control circuit to be powered jointly by adjustment circuit and assists winding circuit, make control
The power supply terminal voltage V of circuitCCCan be in the voltage range of normal work in control circuit.
It can be seen that, power circuit provided by the present invention, the output voltage stabilization under light condition, under normal load state
It is low in energy consumption, and circuit holistic cost is low.
Embodiment two
Fig. 7 is another power circuit diagram provided in an embodiment of the present invention.On the basis of Fig. 6, further, including
Linear voltage-stabilizing circuit 3, one end of linear voltage-stabilizing circuit 3 is connected with the positive pole of the second electric capacity, the other end of linear voltage-stabilizing circuit 3 with
The power end of circuit is controlled to be connected.As the power end V of control circuitCC, can be in the second electric capacity in the case that required precision is very high
C2Positive pole with control circuit power end VCCBetween connect linear voltage-stabilizing circuit 3.Under such a connection, in selection voltage stabilizing two
Pole pipe Dz voltage of voltage regulation VZAnd assists winding NS2The number of turn when, it is considered however that the characteristic of linear voltage-stabilizing circuit 3 used.Institute
The linear voltage-stabilizing circuit 3 of selection, can be the circuit that is made up of linear Integrated voltage stabilizing chip, or the parallel connection being made up of TL431 is steady
Volt circuit and the mu balanced circuit that is made up of diode etc., are not limited herein.
On the other hand, for the output voltage V of more convenient regulation assists winding circuit 1A, can be in assists winding electricity
Increase 3rd resistor R3 in road 1, as shown in fig. 7, because 3rd resistor R3 resistance needs specifically to be needed according to circuit and chooses,
Do not limit herein.
Further, it can increase by the 3rd electric capacity C in assists winding circuit 13, as shown in fig. 7, the 3rd electric capacity C3Just
Pole is connected with the second diode D2 negative pole, its negative pole ground connection, this have the advantage that it is defeated to further increase power circuit
Go out the stability of voltage.
Fig. 8 is another power circuit diagram provided in an embodiment of the present invention.In specific implementation, main winding NS1Different name end
It can be grounded, as shown in Figure 7.As a preferred embodiment, main winding NS1With assists winding NS2Between can be according to
Series system is attached, i.e. main winding NS1Different name termination assists winding NS2Same Name of Ends, assists winding NS2Different name termination
Ground, as shown in Figure 8.
In power circuit environment as shown in Figure 8, it is assumed that the second electric capacity C2Output voltage VAMinimum value is 10V, then voltage stabilizing
Diode Dz voltage of voltage regulation VZDesirable 11V or 12V；First resistor R1 sizes and main output voltage VOWith NPN type triode Q1 loads
It is current related, to reduce power consumption, first resistor R1 current control is flowed through in principle between 0.1mA~0.2mA, such as VOFor
60V、VZDuring for 12V, first resistor R1 can use 240K~470K Ω；Second resistance R2 sizes are determined by control circuit input current
It is fixed；Second diode D2 and the 4th diode D4 can select general high-frequency small power pipe, such as 1N4148.According to main output VOGreatly
It is small, reasonable selection assists winding NS2The number of turn and 3rd resistor R3 resistance, make circuit in normal load state or heavy condition
Under, the second electric capacity C2Output voltage VAVoltage of voltage regulation V slightly larger than voltage-regulator diode DzZ, this ensures that load change time control
Circuit processed is powered stably.
Embodiment three
Fig. 9 is another power circuit diagram provided in an embodiment of the present invention.As shown in Figure 9, due to consideration that some power supplys
Supply voltage V of the circuit for control circuitCCStability requirement is not high, therefore increases by the 5th diode D5 in circuit, cancels line
Property mu balanced circuit 3 connection and the 4th diode D4.As shown in figure 9, the 5th diode D5 newly increased negative pole and NPN type three
Pole pipe Q1 base stage is connected, and its positive pole is connected with the second electric capacity D2 positive pole.
If voltage-regulator diode D3 voltage of voltage regulation VZFor 4.7V, then under circuit normal load, output voltage VAIt is higher, the
After five diode D5 conductings, output voltage VAIt is clamped at (VZ+VD5), when the 5th diode D5 is the general pole of high-frequency small power two
Guan Shi, conduction voltage drop VD5About 0.7V, A point current potential are clamped near 5.4V.When the 5th diode D5 is small-power Schottky
During diode, conduction voltage drop VD5About 0.3V, A point current potential are clamped near 5.0V.Under underloading, Light Condition, auxiliary around
Group NS2Output voltage VADecline, work as VADuring less than (4.7-0.7) V, i.e. 4.0V, NPN type triode Q1 is begun to turn on, and makes A points most
Small current potential is clamped at (4.7-0.7) V, i.e., near 4.0V.It can be seen that, the power circuit in the present embodiment is applied to control circuit
Power end VCCThe not high occasion of stability requirement.
In the above-described embodiments, the embodiment of the power circuit for being powered for control circuit is described in detail.The present invention
A kind of Switching Power Supply is also provided, includes above-mentioned power circuit.Due to power circuit correspondence being described in detail in above-described embodiment
Each embodiment, therefore, the embodiments of switching power supply parts refers to described above, and the present embodiment is repeated no more.
Above to the power circuit provided by the present invention for being used to power for control circuit and opening including the power circuit
Powered-down source is described in detail.The embodiment of each in specification is described by the way of progressive, and each embodiment is stressed
Be all between difference with other embodiment, each embodiment identical similar portion mutually referring to.For implementing
For the disclosed device of example, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is joined
See method part illustration.It should be pointed out that for those skilled in the art, not departing from original of the invention
On the premise of reason, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into right of the present invention and wanted
In the protection domain asked.
It should also be noted that, in this manual, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
Claims (9)
1. a kind of be used for for the power circuit powered of control circuit, including main winding circuit, it is characterised in that also including aid in around
Group circuit and adjustment circuit,
The assists winding circuit includes assists winding, the second diode, the second electric capacity；
Wherein, the assists winding Same Name of Ends is connected with the positive pole of second diode, the negative pole of second diode with
Second capacitance cathode is connected, and the second electric capacity negative pole is connected with the different name end of the assists winding, and is grounded；
The adjustment circuit includes voltage-regulator diode, NPN type triode, first resistor and second resistance；
Wherein, one end of the first resistor is connected with the negative pole of the voltage-regulator diode, and connects the NPN type triode
Base stage, the plus earth of the voltage-regulator diode, the other end of the first resistor is connected with one end of the second resistance, and
Connect the rectifying and wave-filtering output end of the main winding circuit, the other end of the second resistance and the collection of the NPN type triode
Electrode is connected, and the emitter stage of the NPN type triode is connected with second capacitance cathode, and connects the electricity of the control circuit
Source.
2. circuit according to claim 1, it is characterised in that further comprise the 4th diode, the 4th diode
Positive pole be connected with the emitter stage of the NPN type triode, negative pole and the second capacitance cathode phase of the 4th diode
Even.
3. power circuit according to claim 2, it is characterised in that further comprise linear voltage-stabilizing circuit, described linear
One end of mu balanced circuit is connected with the positive pole of second electric capacity, the other end of the linear voltage-stabilizing circuit and the control circuit
Power end be connected.
4. power circuit according to claim 1, it is characterised in that further comprise the 5th diode, the described 5th 2
The negative pole of pole pipe is connected with the base stage of the NPN type triode, and the positive pole and second electric capacity of the 5th diode are just
Extremely it is connected.
5. the power circuit according to Claims 1-4 any one, it is characterised in that further comprise 3rd resistor, institute
The one end for stating 3rd resistor is connected with the negative pole of second diode, the other end of the 3rd resistor and second electric capacity
Positive pole be connected.
6. power circuit according to claim 5, it is characterised in that further comprise the 3rd electric capacity, the 3rd electric capacity
Positive pole be connected with the negative pole of second diode, the negative pole of the 3rd electric capacity ground connection.
7. the power circuit according to Claims 1-4 any one, it is characterised in that the master in the main winding circuit
The different name end of winding is connected with the Same Name of Ends of the assists winding.
8. power circuit according to claim 3, it is characterised in that the linear voltage-stabilizing circuit is specially by linear Integrated
The circuit that voltage stabilizing chip is constituted, or the mu balanced circuit constituted by the TL431 shunt regulating circuits constituted or by diode.
9. a kind of Switching Power Supply, including control circuit, it is characterised in that also including the electricity described in claim 1-8 any one
Source circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710372795.2A CN107040151B (en) | 2017-05-24 | 2017-05-24 | Power supply circuit for supplying power to control circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710372795.2A CN107040151B (en) | 2017-05-24 | 2017-05-24 | Power supply circuit for supplying power to control circuit and switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107040151A true CN107040151A (en) | 2017-08-11 |
| CN107040151B CN107040151B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710372795.2A Active CN107040151B (en) | 2017-05-24 | 2017-05-24 | Power supply circuit for supplying power to control circuit and switching power supply |
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| CN102377347A (en) * | 2011-10-17 | 2012-03-14 | 广州三晶电气有限公司 | Flyback converter for implementing auxiliary output voltage control by using triode and control method |
| CN103956917A (en) * | 2014-05-19 | 2014-07-30 | 深圳市新芯矽创电子科技有限公司 | Switch power supply circuit |
| CN205070791U (en) * | 2015-09-22 | 2016-03-02 | 广州金升阳科技有限公司 | Switching power supply from supply circuit |
| CN105262332A (en) * | 2015-11-18 | 2016-01-20 | 广东工业大学 | Power-on surge current suppression circuit applied to switching power supply |
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| CN107040151B (en) | 2023-05-05 |
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