CN206323291U - Starting circuit and switching power supply - Google Patents
Starting circuit and switching power supply Download PDFInfo
- Publication number
- CN206323291U CN206323291U CN201621396000.9U CN201621396000U CN206323291U CN 206323291 U CN206323291 U CN 206323291U CN 201621396000 U CN201621396000 U CN 201621396000U CN 206323291 U CN206323291 U CN 206323291U
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- circuit
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- electric capacity
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- biasing
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- 230000005611 electricity Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
Classifications
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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 utility model provides a starting circuit, it includes voltage input port, a voltage output port for being connected with external circuit's supply terminal, a voltage generation circuit for producing external circuit operating voltage according to operating current, a drive circuit for providing operating current for voltage generation circuit, a charging circuit for providing second biasing voltage for bias circuit according to charging current for drive circuit provides first biasing voltage when its bias end is the low level, the bias circuit of stop work when its bias end is the high level and is used for. The utility model also provides a switching power supply. When the switching power supply is started, the utility model can provide working voltage for the external circuit through the starting circuit; after the switching power supply normally works, the starting circuit stops working, so that the power loss of the circuit can be reduced, the working efficiency of the switching power supply can be improved, and the standby power consumption of the switching power supply can be reduced.
Description
Technical field
The utility model is related to switch power technology field, more particularly, to a kind of start-up circuit and Switching Power Supply.
Background technology
Current Switching Power Supply is to carry out starting switch electricity as start-up circuit with startup resistance using assists winding, electric capacity mostly
Chip in source, i.e. start resistance by one and charged to an electric capacity, when capacitance voltage is more than chip cut-in voltage, core
Piece works, and after switching power circuit working stability, assists winding works and to chip power supply so that chip operation is stable.
But after Switching Power Supply normal work, start-up circuit is still in work, therefore have certain power consumption, so as to can influence to hold
The operating efficiency and stand-by power consumption in powered-down source.
Utility model content
Regarding to the issue above, the purpose of this utility model is to provide a kind of start-up circuit, its chip in Switching Power Supply
It can automatically be disconnected after normal work, so as to reduce the power attenuation of circuit, and then the work of Switching Power Supply can be improved
Efficiency and the stand-by power consumption for reducing Switching Power Supply.It is a kind of including the start-up circuit that the purpose of this utility model also resides in offer
Switching Power Supply.
To achieve these goals, on the one hand the utility model provides a kind of start-up circuit, and it includes voltage input end
Mouthful, the voltage output port that be connected for the feeder ear with external circuit, work for producing external circuit according to operating current
The voltage generation circuit of voltage, for the voltage generation circuit provide operating current drive circuit, for when its biasing
The biasing for provide the first bias voltage to the drive circuit when low level is in end, being stopped when its offset side is high level
Circuit and the charging circuit for providing the second bias voltage to the biasing circuit according to charging current；
The input of the charging circuit is connected with the control source port, the output end of the charging circuit with it is described
The offset side connection of biasing circuit, the input of the biasing circuit is connected with the control source port, the biasing circuit
Output end be connected with the controlled end of the drive circuit, the input of the drive circuit and the control source port connect
Connect, the output end of the drive circuit is connected with the input of the voltage generation circuit, the output of the voltage generation circuit
End is connected with the voltage output port.
Preferably, the drive circuit is a constant current for providing constant operating current to the voltage generation circuit
Circuit.
Further, the constant-current circuit includes at least one first resistor and the first PNP triode, first electricity
One end of resistance is connected with the control source port, the other end of the first resistor and the transmitting of first PNP triode
Pole is connected, and the base stage of first PNP triode is connected with the output end of the biasing circuit, first PNP triode
Colelctor electrode is connected with the input of the voltage generation circuit.
Preferably, the constant-current circuit includes at least one first resistor and the first PNP triode, the first resistor
One end be connected with the control source port, the emitter stage of the other end of the first resistor and first PNP triode
Connection, the base stage of first PNP triode is connected with the output end of the biasing circuit, the collection of first PNP triode
Electrode is connected with the input of the voltage generation circuit.
Preferably, the charging circuit includes at least one second resistance and at least one first electric capacity, described second
One end of resistance is connected with the control source port, and one end of the other end of the second resistance and first electric capacity connects
Connect, the other end ground connection of first electric capacity；The offset side of the biasing circuit is connected to the second resistance and described first
Between electric capacity.
Preferably, the biasing circuit includes the first diode, the second diode, at least one 3rd resistor and second
PNP triode, the positive pole of first diode is connected with the control source port, the negative pole of first diode and institute
The positive pole connection of the second diode is stated, the negative pole of second diode passes through the 3rd resistor and the poles of the 2nd PNP tri-
The emitter stage connection of pipe, the base stage of second PNP triode is connected with the output end of the charging circuit, the 2nd PNP
The grounded collector of triode；The controlled end of the drive circuit be connected to second diode and the 3rd resistor it
Between.
Preferably, the voltage generation circuit include at least one second electric capacity, one end of second electric capacity with it is described
The output end connection of drive circuit, the other end ground connection of second electric capacity, the voltage output port is connected to the driving
Between the output end of circuit and the electric capacity.
Preferably, the mu balanced circuit of the overtension also including the output end for preventing the voltage generation circuit, institute
The voltage stabilizing end for stating mu balanced circuit is connected with the output end of the voltage generation circuit.
Further, the mu balanced circuit includes a voltage-regulator diode, the negative pole of the voltage-regulator diode and the voltage
The output end connection of generation circuit, the plus earth of the voltage-regulator diode.
The utility model still further aspect additionally provides a kind of Switching Power Supply, and it includes start-up circuit as described above.
The start-up circuit and include the Switching Power Supply of the start-up circuit that the utility model is provided, when the switch
During power initiation, the control source port can give charging circuit charging, now due to the output end of the charging circuit
The second bias voltage formed is also than relatively low, therefore the biasing circuit being connected with the output end of the charging circuit is inclined
The voltage for putting end is low level, so the biasing circuit starts to provide the first biased electrical to the controlled end of the drive circuit
Pressure so that the drive circuit normal work and to the voltage generation circuit provide operating current so that the voltage
Generation circuit is formed with operating voltage of the output to the voltage output port according to the operating current, and then causes external electrical
Road normally works on power.When the Switching Power Supply, which starts, certain time, the voltage of the output end of the charging circuit is enough
Height, the biasing circuit is stopped, so that the drive circuit cannot get the first biasing that the biasing circuit is provided
Voltage and stop give the voltage generation circuit provide operating current, now the start-up circuit be stopped.In summary, originally
Utility model can provide operating voltage by the start-up circuit when the Switching Power Supply starts to the external circuit,
After the Switching Power Supply normal work, the start-up circuit is stopped, so as to reduce the power attenuation of circuit, and then
The operating efficiency of the Switching Power Supply and the stand-by power consumption of the reduction Switching Power Supply can be improved.
Brief description of the drawings
, below will be attached to what is used needed for embodiment in order to illustrate more clearly of the technical solution of the utility model
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present utility model, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of circuit diagram for start-up circuit that the utility model embodiment is provided；
Fig. 2 is a kind of circuit diagram for preferred start-up circuit that the utility model embodiment is provided.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Fig. 1 is referred to, on the one hand the utility model provides a kind of start-up circuit, it includes control source port Vn, use
The voltage output port Vo that is connected in the feeder ear with external circuit, for producing external circuit operating voltage according to operating current
Voltage generation circuit 1, for the voltage generation circuit 1 provide operating current drive circuit 2, for when its offset side
The biasing being stopped during for low level to the first bias voltage of the drive circuit 2 offer, when its offset side is high level
Circuit 3 and the charging circuit 4 for providing the second bias voltage to the biasing circuit 3 according to charging current；
The input of the charging circuit 4 is connected with the control source port Vn, the output end of the charging circuit 4 with
The offset side connection of the biasing circuit 3, the input of the biasing circuit 3 is connected with the control source port Vn, described
The output end of biasing circuit 3 is connected with the controlled end of the drive circuit 2, input and the voltage of the drive circuit 2
Input port Vn connections, the output end of the drive circuit 2 is connected with the input of the voltage generation circuit 1, the voltage
The output end of generation circuit 1 is connected with the voltage output port Vo.
In the utility model embodiment, when the Switching Power Supply starts, the control source port Vn can be to described
Charging circuit 4 charges, and the second bias voltage now formed by the output end of the charging circuit 4 is also than relatively low, therefore
The voltage of the offset side for the biasing circuit 3 being connected with the output end of the charging circuit 4 is low level, so the biasing
Circuit 3 start to the drive circuit 2 controlled end provide the first bias voltage so that the normal work of drive circuit 2 and
Operating current is provided to the voltage generation circuit 1, so that the voltage generation circuit 1 is formed according to the operating current
There is operating voltage of the output to the voltage output port Vo, and then make it that external circuit normally works on power.When the switch
When power initiation has certain time, the voltage of the output end of the charging circuit 4 is sufficiently high, and the biasing circuit 3 is stopped,
So that the drive circuit 2 cannot get the first bias voltage of the offer of biasing circuit 3 and stop producing to the voltage
Raw circuit 1 provides operating current, and now the start-up circuit is stopped.In summary, the utility model is in the switch electricity
When source starts, operating voltage can be provided to the external circuit by the start-up circuit, in the normal work of the Switching Power Supply
After work, the start-up circuit is stopped, and so as to reduce the power attenuation of circuit, and then can improve the Switching Power Supply
Operating efficiency and the reduction Switching Power Supply stand-by power consumption.
In order to which the technical solution of the utility model is better described, a kind of citing of the present utility model is provided herein.
Wherein, prior art to this technical scheme that an electric capacity charges using by a startup resistance due to being used as startup
Circuit, thus the startup time of circuit can be influenceed by input voltage, input voltage is more low so by starting resistance to electric capacity
The electric current of charging is smaller, so that the startup time of circuit is longer, and then has influence on the normal work of circuit.In order to avoid existing
There is this shortcoming of technology, solution is provided in this this citing：Fig. 2 is referred to, in this citing, the drive circuit 2
For a constant-current circuit for providing constant operating current to the voltage generation circuit 1.Wherein, the drive circuit 2 is
Constant-current circuit can be supplied to the operating current of the voltage generation circuit 1 constant, so that the voltage produces electricity
The time of the formation of the operating voltage on road 1 is not influenceed by the input voltage of the control source port Vn, therefore can be effective
Ensure the normal work of circuit.
In this citing, further, the constant-current circuit includes at least one first resistor R1 and the poles of the first PNP tri-
Pipe Q1, one end of the first resistor R1 is connected with the control source port Vn, the other end of the first resistor R1 and institute
State the first PNP triode Q1 emitter stage connection, the base stage of the first PNP triode Q1 and the output of the biasing circuit 3
End connection, the colelctor electrode of the first PNP triode Q1 is connected with the input of the voltage generation circuit 1.Wherein, the electricity
Pressure input port Vn can give the voltage generation circuit 1 by the first resistor R1 and the first PNP triode Q1
Constant operating current is provided.
Refer to Fig. 2, in this citing, the charging circuit 4 include at least one second resistance R2 and at least one
First electric capacity C1, one end of the second resistance R2 is connected with the control source port Vn, and the second resistance R2's is another
End is connected with one end of the first electric capacity C1, the other end ground connection of the first electric capacity C1；The offset side of the biasing circuit 3
It is connected between the second resistance R2 and the first electric capacity C1.Wherein, the first electric capacity C1 is preferably electrochemical capacitor.
Fig. 2 is referred to, in this citing, the biasing circuit 3 includes the first diode D1, the second diode D2, at least
One 3rd resistor R3 and the second PNP triode Q2, the first diode D1 positive pole and the control source port Vn
Connection, the negative pole of the first diode D1 is connected with the positive pole of the second diode D2, and the second diode D2's is negative
Pole is connected by the 3rd resistor R3 with the emitter stage of the second PNP triode Q2, the base of the second PNP triode Q2
Pole is connected with the output end of the charging circuit 4, the grounded collector of the second PNP triode Q2；The drive circuit 2
Controlled end is connected between the second diode D2 and the 3rd resistor R3.
Fig. 2 is referred to, in this citing, the voltage generation circuit 1 includes at least one second electric capacity C2, described second
Electric capacity C2 one end is connected with the output end of the drive circuit 2, and the other end ground connection of the second electric capacity C2, the voltage is defeated
Exit port Vo is connected between the output end of the drive circuit 2 and the electric capacity.Wherein, the second electric capacity C2 is preferably electricity
Solve electric capacity.Wherein, the second electric capacity C2 is preferably electrochemical capacitor.
The operation principle of this citing is as follows：When the Switching Power Supply starts, the control source port Vn passes through described
Second resistance R2 charges to the first electric capacity C1, now due to the first electric capacity C1's and the second PNP triode Q2
The second bias voltage that one end of base stage connection is formed is also than relatively low, the first PNP triode Q1 ON operations, the electricity
Pressure input port Vn electric current passes through the first diode D1, the second diode D2, the 3rd resistor R3 and institute
The second PNP triode Q2 flow directions ground is stated, therefore the first diode D1 and the second diode D2 can be formed with 1.4V
The pressure drop of left and right, is at this moment connected to first PNP triode between the second diode D2 and the 3rd resistor R3
Q1 base stage forward bias, therefore the first PNP triode Q1 turns on, and the control source port Vn passes through described the
One resistance R1 provides constant electric current to the second electric capacity C2, is exported so that the second electric capacity C2 produces one to outer
The operating voltage of portion's circuit, so as to allow external circuit normal work.After the Switching Power Supply normal work, first electric capacity
C1 is fully charged and voltages of its two ends are equal with the voltage of the control source port Vn, therefore the now poles of the 2nd PNP tri-
Pipe Q2 ends due to losing forward bias so that the first PNP triode Q1 cut-offs, so that the second electric capacity C2
Do not recharge, now the start-up circuit is stopped.
As can be seen here,, can be to described outer by the start-up circuit when the Switching Power Supply starts in this citing
Portion's circuit provides operating voltage, and after the Switching Power Supply normal work, the start-up circuit is stopped, so as to reduce
The power attenuation of circuit, and then the operating efficiency of the Switching Power Supply and the standby work(of the reduction Switching Power Supply can be improved
Consumption.
Above-mentioned technical proposal is further improved, Fig. 2 is referred to, the start-up circuit also includes being used to prevent the electricity
The mu balanced circuit 5 of the overtension of the output end of generation circuit 1 is pressed, voltage stabilizing end and the voltage of the mu balanced circuit 5 are produced
The output end connection of circuit 1.Wherein, the mu balanced circuit 5 can be avoided because the electricity of the output end of the voltage generation circuit 1
Press through high and influence the normal work of coupled external circuit.
Preferably, Fig. 2 is referred to, the mu balanced circuit 5 includes the negative of voltage-regulator diode a Z1, the voltage-regulator diode Z1
Pole is connected with the output end of the voltage generation circuit 1, the plus earth of the voltage-regulator diode Z1.Wherein, when described second
During the overtension at electric capacity C2 two ends, the voltage-regulator diode Z1 conductings, so that the second electric capacity C2 discharges and reduced
Its both end voltage, so as to prevent the overtension at the second electric capacity C2 two ends, and then can be avoided because of described second
The overtension at electric capacity C2 two ends and influence the normal work of coupled external circuit.
The utility model still further aspect additionally provides a kind of Switching Power Supply, and it includes start-up circuit as described above.
In the utility model embodiment, the Switching Power Supply is by applying above-mentioned start-up circuit, it is possible to reduction electricity
The power attenuation on road, and then the operating efficiency of the Switching Power Supply and the standby work(of the reduction Switching Power Supply can be improved
Consumption.
The above, embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any those skilled in the art is disclosed in the utility model in technical scope, the change that can be readily occurred in
Change or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with described
Scope of the claims is defined.
Claims (9)
1. a kind of start-up circuit, it is characterised in that the electricity being connected including control source port, for the feeder ear with external circuit
Press output port, the voltage generation circuit for producing external circuit operating voltage according to operating current, for the voltage
Generation circuit provides the drive circuit of operating current, for providing first to the drive circuit when its offset side is low level
Bias voltage, the biasing circuit that is stopped and for giving the biasing according to charging current when its offset side is high level
Circuit provides the charging circuit of the second bias voltage；
The input of the charging circuit is connected with the control source port, the output end of the charging circuit and the biasing
The offset side connection of circuit, the input of the biasing circuit is connected with the control source port, the biasing circuit it is defeated
Go out end to be connected with the controlled end of the drive circuit, the input of the drive circuit is connected with the control source port, institute
The output end for stating drive circuit is connected with the input of the voltage generation circuit, the output end of the voltage generation circuit and institute
State the connection of voltage output port.
2. start-up circuit according to claim 1, it is characterised in that the drive circuit is one for giving voltage production
Raw circuit provides the constant-current circuit of constant operating current.
3. start-up circuit according to claim 2, it is characterised in that the constant-current circuit includes at least one first resistor
And first PNP triode, one end of the first resistor is connected with the control source port, the first resistor it is another
End is connected with the emitter stage of first PNP triode, the base stage of first PNP triode and the output of the biasing circuit
End connection, the colelctor electrode of first PNP triode is connected with the input of the voltage generation circuit.
4. start-up circuit according to claim 1, it is characterised in that the charging circuit includes at least one second resistance
And at least one first electric capacity, one end of the second resistance is connected with the control source port, the second resistance
The other end is connected with one end of first electric capacity, the other end ground connection of first electric capacity；The offset side of the biasing circuit
It is connected between the second resistance and first electric capacity.
5. start-up circuit according to claim 1, it is characterised in that the biasing circuit includes the first diode, second
Diode, at least one 3rd resistor and the second PNP triode, positive pole and the voltage input end of first diode
Mouth connection, the negative pole of first diode is connected with the positive pole of second diode, and the negative pole of second diode leads to
The emitter stage that the 3rd resistor is crossed with second PNP triode is connected, and the base stage of second PNP triode is filled with described
The output end connection of circuit, the grounded collector of second PNP triode；The controlled end of the drive circuit is connected to institute
State between the second diode and the 3rd resistor.
6. start-up circuit according to claim 1, it is characterised in that the voltage generation circuit include at least one second
Electric capacity, one end of second electric capacity is connected with the output end of the drive circuit, the other end ground connection of second electric capacity, institute
Voltage output port is stated to be connected between the output end of the drive circuit and the electric capacity.
7. the start-up circuit according to claim 1 to 6 any one, it is characterised in that also including for preventing the electricity
Press the mu balanced circuit of the overtension of the output end of generation circuit, voltage stabilizing end and the voltage generation circuit of the mu balanced circuit
Output end connection.
8. start-up circuit according to claim 7, it is characterised in that the mu balanced circuit includes a voltage-regulator diode, institute
The negative pole for stating voltage-regulator diode is connected with the output end of the voltage generation circuit, the plus earth of the voltage-regulator diode.
9. a kind of Switching Power Supply, it is characterised in that including the start-up circuit as described in claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621396000.9U CN206323291U (en) | 2016-12-19 | 2016-12-19 | Starting circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621396000.9U CN206323291U (en) | 2016-12-19 | 2016-12-19 | Starting circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206323291U true CN206323291U (en) | 2017-07-11 |
Family
ID=59268307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621396000.9U Active CN206323291U (en) | 2016-12-19 | 2016-12-19 | Starting circuit and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206323291U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023472A (en) * | 2017-12-16 | 2018-05-11 | 无锡昌至盛机械制造有限公司 | A kind of start-up circuit of quick low-power consumption |
| CN109302052A (en) * | 2018-11-12 | 2019-02-01 | 广东乐心医疗电子股份有限公司 | High-voltage starting circuit and switching power supply |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
-
2016
- 2016-12-19 CN CN201621396000.9U patent/CN206323291U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023472A (en) * | 2017-12-16 | 2018-05-11 | 无锡昌至盛机械制造有限公司 | A kind of start-up circuit of quick low-power consumption |
| CN109302052A (en) * | 2018-11-12 | 2019-02-01 | 广东乐心医疗电子股份有限公司 | High-voltage starting circuit and switching power supply |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
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