CN109980912A - A kind of easy soft starting circuit - Google Patents
A kind of easy soft starting circuit Download PDFInfo
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- CN109980912A CN109980912A CN201910325114.6A CN201910325114A CN109980912A CN 109980912 A CN109980912 A CN 109980912A CN 201910325114 A CN201910325114 A CN 201910325114A CN 109980912 A CN109980912 A CN 109980912A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Abstract
The present invention relates to circuit structures, it is desirable to provide a kind of easy soft starting circuit.The circuit includes rectification circuit and DC/DC or DC/AC conversion circuit；And inductance L1, storage capacitor C1 and two switching tubes Q1, Q2；Wherein, inductance L1 is connected to rectification circuit one end, and the both ends of first switch tube Q1 are coupled to the both ends of rectification circuit and inductance L1, and storage capacitor C1 is connected to the both ends of conversion circuit.When switching tube is connected in the present invention, pressure drop is small, temperature is low, and power-efficient is high compared to the power supply of series connection NTC thermistor, will not circumference element.Can to avoid NTC in high-temperature can not transient suppression dash current the problem of.It can either be used for low-power circuit, can be used for thousands of watts to hundreds of kilowatts of large power supply.It is not only applicable to the circuit of input tape active power factor adjustment, being also applied for input is the adjustment of passive power factor (PF) or circuit, including Switching Power Supply, LED driver, fluorescent lamp ballast, HID ballast etc. without PFC.
Description
Technical field
The present invention relates to circuit structure, in particular to a kind of easy soft starting circuit.
Background technique
Due to the presence of capacitor in circuit, very big transient current can be generated plus voltage suddenly, therefore is generally being connected
It first connects when power supply certain resistance, this short-circuit resistance again after delay, this process limits booting transient current, and this
The circuit of sample is then known as soft starting circuit.The application of soft starting circuit is very extensive, for example, Switching Power Supply, LED driver,
Fluorescent lamp ballast, HID ballast etc..
Existing common soft start circuit structure is usually as shown in Figure 1, usually in input power to the electricity of storage capacitor C1
One NTC thermistor of series connection in road.NTC thermistor resistance when temperature is lower is larger, and generally 1-10 ohm, due to electricity
The presence for hindering larger NTC, when so that power supply just powering on, source current can be significantly reduced booting moment by NTC and flow through C1 electricity
The size of current of appearance.Reducing booting transient current has many benefits, for example extends the service life of fuse in circuit, reduces by two poles
Pipe, inductance L1, the rush of current of capacitor C1 and fever.And in the occasion of large-scale use distributed generation resource, mains electricity input end one
As have fuse or air switch, contactor etc., by reduce power supply booting transient current, fuse, sky can be made
The dash current of air cock or contactor becomes smaller, and reduces the probability of these device trips, improves reliability.
For the soft starting circuit using NTC thermistor, there are following insoluble shortcomings:
(1) NTC thermistor resistance in low temperature or room temperature is larger, with the booting work of power supply, flows through the electricity of NTC
Continuous heating NTC is flowed, spends more and is always maintained at 100 so that the temperature of NTC rises to, reduce the efficiency of power supply；On the other hand,
High temperature can also cause a hidden trouble to other components around, need to reserve enough spaces, and preventing other elements to be heated leads to temperature
It rises.
(2) after NTC thermistor heating, resistance is reduced rapidly, and anti-transient current ability disappears.At this time again to power supply into
Row switch, booting transient current can become again and not add NTC almost big.Therefore, which is not suitable for needing
Frequently switch on the occasion of power supply.
(3) NTC thermistor is generally used for small-power power；When power increases or storage capacitor C1 is larger,
Input immediate current is excessive to be easy to damage NTC, thus using few in large power supply.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide a kind of easy soft start electricity
Road.In order to solve the problems, such as the transient current of power supply booting, the present invention is based on existing series connection NTC technologies to propose new thinking.It is logical
Increase switching tube and its driving are crossed, limitation input current flows through storage capacitor to carry out soft start.
In order to solve the above technical problems, the solution that the present invention uses is:
A kind of easy soft starting circuit, including rectification circuit are provided, and are connected to DC/DC or the DC/AC conversion of load
Circuit；The soft starting circuit further includes an inductance L1, a storage capacitor C1 and two switching tubes Q1, Q2；Wherein, inductance L1
It is connected to rectification circuit one end, the both ends of first switch tube Q1 are coupled to the both ends of rectification circuit and inductance L1, storage capacitor C1
It is connected to the both ends of conversion circuit；Second switch Q2 is arranged by any one following scheme:
(1) diode D5, diode D5 and inductance L1, first switch tube Q1 are set between inductance L1 and storage capacitor C1
Collectively constitute pfc circuit；Rectification circuit and conversion circuit connection midpoint and storage capacitor C1 and between second switch is set
The gate pole of pipe Q2, first switch tube Q1 and second switch Q2 are connected to driving circuit simultaneously, and driving circuit is connected with control circuit；
(2) diode D5, diode D5 and inductance L1, first switch tube Q1 are set between inductance L1 and storage capacitor C1
Collectively constitute pfc circuit；The both ends of second switch Q2 are separately connected rectification circuit and conversion circuit and not ipsilateral with inductance L1,
The gate pole of first switch tube Q1 and second switch Q2 are connected to driving circuit simultaneously, and driving circuit is connected with control circuit；
(3) second switch Q2 is set between inductance L1 and storage capacitor C1；First switch tube Q1 and second switch
The gate pole of Q2 is connected to driving circuit simultaneously, and driving circuit is connected with control circuit；
(4) diode D5, diode D5 and inductance L1, first switch tube Q1 are set between inductance L1 and storage capacitor C1
Collectively constitute pfc circuit；Rectification circuit and conversion circuit connection midpoint and storage capacitor C1 and between second switch is set
Pipe Q2, the both ends of second switch Q2 simultaneously meet a power resistor R1；The gate pole of second switch Q2 is connected to driving circuit, driving
Circuit is connected to sample circuit by control circuit, and sample circuit is connected to the connection midpoint of storage capacitor C1 and second switch Q2.
In the present invention, the rectification circuit is a diode D1 or a bridge-type being made of four diodes
Rectification circuit.
In the present invention, the storage capacitor C1 is electrolytic capacitor.
It further include input rectifying voltage detecting circuit or electrolytic capacitor cathode voltage detection circuit in the present invention.It (can also
Not use detection circuit, but soft start is carried out to power supply by preset opened loop control, reaches soft start after a certain period of time
It completes, can enter and work normally)
In the present invention, first switch tube Q1 and second switch Q2 are switch mosfet pipe or IGBT switching tube.
Invention further provides the methods for realizing soft start using soft starting circuit above-mentioned, when the soft start electricity
When road is powered, first switch tube Q1 is in close state；Second switch Q2 is connected every time with the time of 0.1~10 microsecond, electricity
Stream flows through storage capacitor C1 and steps up its both end voltage to prevent heavy current impact；The voltage of storage capacitor C1 rises to just
Soft start is completed behind the 50~90% of rectified voltage when often working, at this time second switch Q2 constant conduction, first switch tube Q1
Start to work normally；The time that soft start terminates is determined by the capacity of storage capacitor C1 and the conducting dutycycle of second switch Q2
It is fixed.
In the present invention, when control circuit controls first switch tube Q1 and second switch Q2, fixed duty is selected
Than, step up duty ratio, or fixed turn-on time is adjusted turn-on frequency.
In the present invention, when control circuit is connect with input rectifying voltage detecting circuit, control circuit is according to input voltage
Determine that the turn-on time of second switch Q2 and period, the angle of flow step up directly from 180 degree/360 degree with capacitance voltage value
The 50~90% of rectified voltage when reaching normal work to capacitance voltage, second switch Q2 can be fully on；Or by
Two switching tube Q2 are connected every time with the time of 0.1-10 microsecond, whole when the voltage for detecting storage capacitor C1 reaches normal work
Galvanic electricity pressure 50~90% when, Q2 is fully on.
The present invention also provides a kind of easy soft starting circuits, and input terminal is direct current input, or is connected to rectification
The exchange of circuit inputs；Its output end is DC/DC the or DC/AC conversion circuit for being connected to load；It is characterized in that,
The soft starting circuit further includes storage capacitor C1 and second switch Q2, parallel connection input terminal and output after the two concatenation
Between end, second switch Q2 is sequentially connected with driving circuit and control circuit；Control circuit generates control signal and is supplied to drive
Dynamic circuit turns it on or on-off switching tube, the control mode used for it is following any one: according to input voltage phase control
System, fixed duty cycle step up duty ratio, or fixed turn-on time is adjusted turn-on frequency.
In the present invention, when input terminal is direct current input, it is arranged one between the anode and storage capacitor C1 of input power
A inductance L1；The control mode that control circuit uses for fixed duty cycle, step up duty ratio, or fixed turn-on time is to leading
Passband rate is adjusted；Alternatively,
When input terminal is exchange input, the rectification circuit to connect with AC power source is a diode D1, or by
The bridge rectifier of four diodes composition；The control mode that control circuit uses is controls according to input voltage phase.
Inventive principle description:
In the soft start-up process of circuit of the present invention, switching tube is used to lead in the progress short time in each alternating current period
It is logical, so that mains current injects the electrolytic capacitor C1 of large capacity by multiple low current mode, prevent the heavy current impact of single.
When detailed process shows themselves in that energization, first switch tube Q1 is closed, and second switch Q2 is connected with the duty ratio of very little.Second opens
When closing pipe Q2 conducting, electric current flows through the capacitor C1 of large capacity, slowly improves capacitor C1 both end voltage, prevents heavy current impact.Root
According to capacitor C1 capacity and conducting dutycycle, the voltage of capacitor C1 rises to a certain extent after a certain period of time, and soft start terminates, and second
Switching tube Q2 constant conduction, first switch tube Q1 start to work normally.
Control circuit can gradually be mentioned for generating control signal to driving circuit using fixed duty cycle or duty ratio
Height or turn-on time are fixed, and the modes such as turn-on frequency variation are controlled.Such as when circuit start, second switch Q2 is led
The logical time sets very little, such as opens 1~10 microsecond, at regular intervals, for example 100 microseconds are opened once.When switching tube is connected,
Electric current flows through capacitor C1 and second switch Q2, charges to capacitor C1, since second switch Q2 turn-on time is very short, stream
The electric current very little for crossing capacitor C1, avoids rush of current.Soft-start time is arranged according to the capacity of capacitor C1.
Driving circuit receives the signal of comparison circuit generation, turns on and off switching tube；Input rectifying voltage detecting circuit
For detecting input voltage, which not necessarily, depends on control circuit using what control method；Electrolytic capacitor anode
Voltage detecting circuit is used for and input voltage compares and determine whether soft start is completed, which not necessarily, depends on control
Circuit processed uses any control method；If detected with input voltage measurement or capacitance voltage, control circuit can be according to input
Voltage and capacitance voltage value determine turn-on time and the period of second switch Q2.Such as when input power is alternating current, second
The angle of flow of switching tube Q2 can improve the several years from 180 degree/360 degree gradually forward every time, until capacitance voltage is sufficiently high, the
Two switching tube Q2 can be fully on.
The present invention can also be more simplified scheme (as Figure 7-9), not no soft start is general compared to the prior art
Circuit passband mainly increases a switching tube Q2 and its control circuit.Such as diode and inductance, switching tube are general PFC
Circuit components bridge rectifier is common rectification circuit.It, still can be with after these circuits are simplified some components
With soft start function, it is adaptable to different input voltage environment.
Compared with prior art, the solution have the advantages that:
1, in the present invention when switching tube conducting, pressure drop is small, temperature is low, electricity of the power-efficient compared to series connection NTC thermistor
Source is high, will not circumference element.
2, compared to the scheme of series connection NTC thermistor, circuit of the invention can not press down to avoid NTC in high-temperature
The problem of great instantaneous current processed.
3, soft starting circuit of the invention can either be used for low-power circuit, can be used for thousands of watts to hundreds of kilowatts
Large power supply, strong applicability.
4, soft starting circuit of the invention is not only applicable to the circuit of input tape active power factor adjustment (APFC),
Suitable for inputting for the adjustment of passive power factor (PF) or without the circuit of PFC, including Switching Power Supply, LED driver, fluorescent lamp town
Flow device, HID ballast etc..
Detailed description of the invention
Fig. 1 is soft start circuit structure schematic diagram commonly used in the prior art；
Fig. 2 is the soft starting circuit schematic diagram in the embodiment of the present invention 1；
Fig. 3 is the soft starting circuit schematic diagram in the embodiment of the present invention 2；
Fig. 4 is the soft starting circuit schematic diagram in the embodiment of the present invention 3；
Fig. 5 is the soft starting circuit schematic diagram in the embodiment of the present invention 4；
Fig. 6 is the soft starting circuit schematic diagram in the embodiment of the present invention 5；
Fig. 7 is one of most simplified circuit when AC power source inputs；
Fig. 8 is two of most simplified circuit when AC power source inputs；
Fig. 9 is most simplified circuit when direct current power transmission source inputs.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail.
Embodiment 1
As shown in Fig. 2, the soft starting circuit, including rectification circuit, it is connected to DC/DC or DC/AC conversion circuit, the electricity of load
Feel L1, capacitor C1 and two switching tubes Q1, Q2；Inductance L1 is connected to rectification circuit one end, the both ends of first switch tube Q1 and connection
To the both ends of rectification circuit and inductance L1, capacitor C1 is connected to the both ends of conversion circuit；
Diode D5 is set between inductance L1 and capacitor C1；At the connection midpoint and capacitor of rectification circuit and conversion circuit
C1 and between be arranged second switch Q2, first switch tube Q1 and second switch Q2 gate pole simultaneously be connected to driving circuit, drive
Dynamic circuit is connected with control circuit.
In the example, the electric current that second switch Q2 flows through is identical as capacitor C1.
Embodiment 2
As shown in figure 3, the soft starting circuit, including rectification circuit, it is connected to DC/DC or DC/AC conversion circuit, the electricity of load
Feel L1, capacitor C1 and two switching tubes Q1, Q2；Inductance L1 is connected to rectification circuit one end, the both ends of first switch tube Q1 and connection
To the both ends of rectification circuit and inductance L1, capacitor C1 is connected to the both ends of conversion circuit；
Diode D5 is set between inductance L1 and capacitor C1；The both ends of second switch Q2 be separately connected rectification circuit and
The gate pole of conversion circuit and not ipsilateral with inductance L1, first switch tube Q1 and second switch Q2 is connected to driving circuit simultaneously, drives
Dynamic circuit is connected with control circuit；
In the embodiment, the electric current that second switch Q2 flows through is the electric current for flowing through C1 and DC/AC or DC/DC change below
Change the sum of the electric current of circuit.Compared to the circuit in embodiment 1, in the present embodiment second switch Q2 current requirements used in circuit compared with
The former is higher.
Embodiment 3
As shown in figure 4, the soft starting circuit, including rectification circuit, it is connected to DC/DC or DC/AC conversion circuit, the electricity of load
Feel L1, capacitor C1 and two switching tubes Q1, Q2；Inductance L1 is connected to rectification circuit one end, the both ends of first switch tube Q1 and connection
To the both ends of rectification circuit and inductance L1, capacitor C1 is connected to the both ends of conversion circuit；
Second switch Q2 is set between inductance L1 and capacitor C1；The gate pole of first switch tube Q1 and second switch Q2
It is connected to driving circuit simultaneously, driving circuit is connected with control circuit；
In this embodiment, the in the same manner as in Example 2 of second switch Q2 is flowed through, but compares Examples 1 and 2, it is few
One diode is substituted in the position of original diode with second switch Q2.The control of second switch Q2 need to be with
The control of one switching tube Q1 is associated, prevents electric current on capacitor C1 from flowing backward into first switch tube Q1.
Embodiment 4
As shown in figure 5, the soft starting circuit, including rectification circuit, it is connected to DC/DC or DC/AC conversion circuit, the electricity of load
Feel L1, capacitor C1 and two switching tubes Q1, Q2；Inductance L1 is connected to rectification circuit one end, the both ends of first switch tube Q1 and connection
To the both ends of rectification circuit and inductance L1, capacitor C1 is connected to the both ends of conversion circuit；
Diode D5 is set between inductance L1 and capacitor C1；At the connection midpoint and capacitor of rectification circuit and conversion circuit
C1 and between be arranged second switch Q2, the both ends of second switch Q2 simultaneously meet a power resistor R1；Second switch Q2's
Gate pole is connected to driving circuit, and driving circuit is connected to sample circuit by control circuit, and sample circuit is connected to capacitor C1 and second and opens
Close the connection midpoint of pipe Q2.
In the embodiment, one power resistor R1 of parallel connection at second switch Q2.When circuit start, second switch Q2
It closes, the electric current of capacitor C1 can be easy to limitation starting by the resistance value of regulation power resistance R1 by power resistor R1
Dash current.After capacitance voltage increases, the electric current for flowing through power resistor R1 reduces, i.e. the voltage at the both ends power resistor R1 subtracts
It is small, switching tube is opened at this time, and circuit is worked normally.
Embodiment 5
As shown in fig. 6, the soft starting circuit is the specific implementation of embodiment 4.When circuit start, on power resistor R1
Larger current is flowed through, the upper pressure drop of R1 is higher, R3, and R4 detects the voltage on power resistor R1, if voltage is high on R1, triode
Q3 conducting, so that switching tube Q2 is turned off.When voltage rises to a certain degree on capacitor C1, R1 powers on drops, at this time triode
Q3 shutdown, switching tube Q2 is open-minded by the electric current that R2 is provided, and soft start terminates.
For the circuit shown in the embodiment 1 to 5, illustrate that soft starting circuit realizes that the method for soft start is as follows:
When soft starting circuit is powered, first switch tube Q1 is in close state；Second switch Q2 is every time with 0.1~10
The time of microsecond is connected, and electric current flows through storage capacitor C1 and steps up its both end voltage to prevent heavy current impact；Energy storage electricity
Soft start is completed behind the 50~90% of rectified voltage when the voltage of appearance C1 rises to normal work, second switch Q2 continues at this time
Conducting, first switch tube Q1 start to work normally；The time that soft start terminates by storage capacitor C1 capacity and second switch
The conducting dutycycle of Q2 determines.
When control circuit controls first switch tube Q1 and second switch Q2, selects fixed duty cycle, gradually mentions
High duty ratio, or fixed turn-on time are adjusted turn-on frequency.
When control circuit is connect with input rectifying voltage detecting circuit, control circuit is according to input voltage and capacitance voltage
Value determines that the turn-on time of second switch Q2 and period, the angle of flow are stepped up from 180 degree/360 degree until capacitance voltage
When reaching normal work rectified voltage 50~90% when, second switch Q2 can be fully on；Or by second switch
Q2 is connected every time with the time of 0.1~10 microsecond, the rectified voltage when the voltage for detecting storage capacitor C1 reaches normal work
50~90% when, Q2 is fully on.
Embodiment 6
Most simplified circuit when inputting for AC power source of Fig. 7,8, difference are that diode D1-D4 is used in Fig. 7 to be formed
Bridge rectifier be used for by AC rectification at direct current.And Fig. 8 only with a diode D1 as rectifier.Fig. 7,8
In that L1 inductance is not added, the control mode that control circuit uses is soft according to the phase controlling second switch Q2 of input voltage
Starting.L1 can also be increased in the simplification circuit, it so both can be soft according to the phase controlling second switch Q2 of input voltage
Starting, can not also detect input voltage phase, but selects fixed duty cycle, steps up duty ratio, or fixed conducting
Time is adjusted turn-on frequency.
Embodiment 7
Fig. 9 is most simplified circuit when direct current power transmission source inputs, and is needed in the case in input power and storage capacitor
Between C1 increase inductance L1, the control mode that control circuit uses for select fixed duty cycle, step up duty ratio, Huo Zhegu
Determine turn-on time to be adjusted turn-on frequency.
Claims (10)
1. a kind of easy soft starting circuit, including rectification circuit, and it is connected to DC/DC the or DC/AC conversion circuit of load；Its
It is characterized in that, which further includes an inductance L1, a storage capacitor C1 and two switching tubes Q1, Q2；Wherein, electric
Sense L1 is connected to rectification circuit one end, and the both ends of first switch tube Q1 are coupled to the both ends of rectification circuit and inductance L1, energy storage electricity
Hold the both ends that C1 is connected to conversion circuit；Second switch Q2 is arranged by any one following scheme:
(1) diode D5 is set between inductance L1 and storage capacitor C1, and diode D5 and inductance L1, first switch tube Q1 are common
Form pfc circuit；Rectification circuit and conversion circuit connection midpoint and storage capacitor C1 and between be arranged second switch Q2,
The gate pole of first switch tube Q1 and second switch Q2 are connected to driving circuit simultaneously, and driving circuit is connected with control circuit；
(2) diode D5 is set between inductance L1 and storage capacitor C1, and diode D5 and inductance L1, first switch tube Q1 are common
Form pfc circuit；The both ends of second switch Q2 are separately connected rectification circuit and conversion circuit and not ipsilateral with inductance L1, and first
The gate pole of switching tube Q1 and second switch Q2 are connected to driving circuit simultaneously, and driving circuit is connected with control circuit；
(3) second switch Q2 is set between inductance L1 and storage capacitor C1；First switch tube Q1's and second switch Q2
Gate pole is connected to driving circuit simultaneously, and driving circuit is connected with control circuit；
(4) diode D5 is set between inductance L1 and storage capacitor C1, and diode D5 and inductance L1, first switch tube Q1 are common
Form pfc circuit；Rectification circuit and conversion circuit connection midpoint and storage capacitor C1 and between be arranged second switch Q2,
The both ends of second switch Q2 simultaneously meet a power resistor R1；The gate pole of second switch Q2 is connected to driving circuit, driving circuit
It is connected to sample circuit by control circuit, sample circuit is connected to the connection midpoint of storage capacitor C1 and second switch Q2.
2. soft starting circuit according to claim 1, which is characterized in that the rectification circuit is a diode D1, or
Person is the bridge rectifier being made of four diodes.
3. soft starting circuit according to claim 1, which is characterized in that the storage capacitor C1 is electrolytic capacitor.
4. soft starting circuit according to claim 1, which is characterized in that further include input rectifying voltage detecting circuit or
Electrolytic capacitor cathode voltage detection circuit.
5. soft starting circuit according to claim 1, which is characterized in that first switch tube Q1 and second switch Q2 are
Switch mosfet pipe or IGBT switching tube.
6. the method for realizing soft start using soft starting circuit described in claim 1, which is characterized in that when the soft start electricity
When road is powered, first switch tube Q1 is in close state；Second switch Q2 is connected every time with the time of 0.1~10 microsecond, electricity
Stream flows through storage capacitor C1 and steps up its both end voltage to prevent heavy current impact；The voltage of storage capacitor C1 rises to just
Soft start is completed behind the 50~90% of rectified voltage when often working, at this time second switch Q2 constant conduction, first switch tube Q1
Start to work normally；The time that soft start terminates is determined by the capacity of storage capacitor C1 and the conducting dutycycle of second switch Q2
It is fixed.
7. according to the method described in claim 6, it is characterized in that, control circuit is to first switch tube Q1 and second switch Q2
When being controlled, fixed duty cycle selected, step up duty ratio, or fixed turn-on time is adjusted turn-on frequency.
8. according to the method described in claim 6, it is characterized in that, when control circuit is connect with input rectifying voltage detecting circuit
When, control circuit determines turn-on time and the period of second switch Q2, the angle of flow according to input voltage and capacitance voltage value
When stepping up 50~90% of rectified voltage when capacitance voltage reaches normal work from 180 degree/360 degree, second switch
Pipe Q2 can be fully on；Or second switch Q2 is connected every time with time of 0.1~10 microsecond, when detecting energy storage electricity
Hold the voltage of C1 when reaching normal work rectified voltage 50~90% when, Q2 is fully on.
9. a kind of easy soft starting circuit, input terminal is direct current input, or is connected to the exchange input of rectification circuit；Its
Output end is DC/DC the or DC/AC conversion circuit for being connected to load；It is characterized in that,
The soft starting circuit further includes storage capacitor C1 and second switch Q2, after the two concatenation input terminal and output end in parallel it
Between, second switch Q2 is sequentially connected with driving circuit and control circuit；Control circuit generates control signal and is supplied to driving electricity
Road turns it on or on-off switching tube, the control mode used for it is following any one: according to input voltage phase control, solid
Determine duty ratio, step up duty ratio, or fixed turn-on time is adjusted turn-on frequency.
10. soft starting circuit according to claim 9, which is characterized in that
When input terminal is direct current input, an inductance L1 is set between the anode and storage capacitor C1 of input power；Control
The control mode that circuit uses for fixed duty cycle, step up duty ratio, or fixed turn-on time adjusts turn-on frequency
It is whole；Alternatively,
When input terminal is exchange input, the rectification circuit to connect with AC power source is a diode D1, or by four
The bridge rectifier of diode composition；The control mode that control circuit uses is controls according to input voltage phase.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI796052B (en) * | 2021-01-22 | 2023-03-11 | 大陸商上海艾為電子技術股份有限公司 | A dc-dc converter, an electronic device, and a soft-start method for the dc-dc converter |
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| CN204497972U (en) * | 2015-03-20 | 2015-07-22 | 张晗月 | A kind of novel retention time circuit structure |
| US20170025962A1 (en) * | 2015-07-21 | 2017-01-26 | Christopher Donovan Davidson | Single stage isolated ac/dc power factor corrected converter |
| CN105915081A (en) * | 2016-03-17 | 2016-08-31 | 常州钜特工业科技有限公司 | Topology structure and control method of step-down type AC-DC converter |
| CN106655835B (en) * | 2016-11-16 | 2018-11-23 | 西华大学 | The topological structure converter and its control method of single inductance two-stage type |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI796052B (en) * | 2021-01-22 | 2023-03-11 | 大陸商上海艾為電子技術股份有限公司 | A dc-dc converter, an electronic device, and a soft-start method for the dc-dc converter |
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Application publication date: 20190705 |