CN205596031U - Synchronous Rectifier control circuit and use its switching power supply - Google Patents
Synchronous Rectifier control circuit and use its switching power supply Download PDFInfo
- Publication number
- CN205596031U CN205596031U CN201620188423.5U CN201620188423U CN205596031U CN 205596031 U CN205596031 U CN 205596031U CN 201620188423 U CN201620188423 U CN 201620188423U CN 205596031 U CN205596031 U CN 205596031U
- Authority
- CN
- China
- Prior art keywords
- control circuit
- power supply
- circuit
- switching power
- synchronous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a synchronous Rectifier control circuit and use its switching power supply, output variation voltage sampling circuit's input gather the change voltage of switching power supply output, offer drive and control circuit's input behind the formation sample current through its output, and control signal is exported to drive and control circuit's output, when switching power supply started or closes, control signal drew the drive level of low synchronous Rectifier pipe, delayed a period in the start -up course or after starting again, and the synchronous Rectifier pipe all is that work is at its body diode rectification state in this time quantum, when switching power supply got into stable -state work, drive and control circuit was off state. Thereby prevent switching power supply when starting or closing the energy of storage in output capacitance to counter the irritating in power inside to getting into stable -state work, switching power supply does not influence this transformer winding self -driven synchronous rectification circuit's work when.
Description
Technical field
This utility model relates to a kind of synchronous commutating control circuit and applies its Switching Power Supply, particularly to using transformation
The control of device winding self-device synchronous rectification and application thereof.
Background technology
Along with semiconductor device and the fast development of super large-scale integration, to big electric current, low-voltage, low cost is isolated
The demand of Switching Power Supply is significantly increased the most therewith.Forward voltage drop only has the Schottky diode rectification of 0.3V-0.7V, turns on greatly damage
Consumption becomes the bottleneck of Switching Power Supply miniaturization.In order to improve low-voltage, the efficiency of high-current switch power supply, output rectification all uses
Synchronous rectification, in prior art, is the most all to have employed two kinds of type of drive, Transformer Winding self-driven type, control
Chip is outer driving.
Circuit as shown in Figure 1 is one of Transformer Winding self-driven type circuit, and Transformer Winding self-driven type synchronizes whole
Current circuit is the auxiliary winding from transformator due to driving voltage, and circuit is simple, space is little, low cost, so at high power
In the modular power source application of density, winding self-driven type is widely used.But winding self-driven type circuit is due in output
Connect big filter capacitor, load as, in unloaded start-up course, occurring that capacitance current is reversely circulated into inside module, cause power supply
The phenomenon that module continued flow tube spoilage is high.Fig. 2 is the waveform correlation figure in start-up course.
Circuit as shown in Figure 1 is the secondary circuit of common positive exciting synchronous rectification, and the actuation techniques of synchronous rectification is then
It is to have employed the self-driven mode of Transformer Winding.Inductance L is output energy storage inductor, when normally the working, (conducting of switch originally
Time we be defined as Ton, the shut-in time of switch is defined as Toff originally), the Ton time period, input voltage vin passes through transformation
The turn ratio of device is converted secondary and is formed transformer secondary voltage Vs, and Vs returns to transformation through inductance L, output loading, rectifier tube
Device vice-side winding, it is the voltage on energy storage inductor L that Vs voltage deducts output voltage, and the electric current of inductance L is the process of linear rise,
So the process that the Ton time period is inductance L energy storage.The Toff time period, the voltage on inductance L is reversed, and its voltage is equal to output
Voltage, the energy being stored in inductance L is discharged by output loading, afterflow metal-oxide-semiconductor.
In forward topology output uses the application of diode rectification, with the change of output load current, the electricity on inductance L
Stream has both of which, continuous mode and discontinuous mode.Employing Transformer Winding self-device synchronous rectification electric current as shown in Figure 1 is only
There is a kind of mode of operation, it is simply that electric current continuous operation mode.Diode rectification and the electricity of Transformer Winding self-device synchronous rectification
The current waveform of sense L contrasts as shown in Figure 2.
From Fig. 2 D it appeared that Transformer Winding self-device synchronous rectification circuit is underloading when, inductive current is by forward
Form with negative current.Under steady state conditions, this negative current causes open circuit loss to strengthen, owing to current value is smaller, and will not
The afterflow metal-oxide-semiconductor of product is produced the impact damaged.
The power supply product of winding self-powered circuit of synchronous rectification as shown in Figure 1, connects big output filter capacitor in output, unloaded
The when of startup, arise that output voltage as shown in Figure 3 and continued flow tube current waveform.From Fig. 3 it is found that continued flow tube
Current waveform creates the biggest negative current, and this negative current value is likely to result in output energy storage inductor L product under the high temperature conditions
Raw saturated, saturated after negative sense freewheel current up to tens amperes, cause continued flow tube by circuit damage.
To sum up, there is techniques below problem in existing Transformer Winding self-device synchronous rectification circuit:
(1), when start-up course is unloaded capacitive start-up course, can produce and counter fill electric current, cause power module continued flow tube to damage
Rate；
(2) there is certain probability in above-mentioned anti-filling electric current to the damage of product, and high temperature lower probability is big, and room temperature lower probability is little, institute
To be difficult to be found, it also is difficult to countermeasure after discovery and has solved, so becoming " the stealthy killer " of this series products.
Utility model content
Having in view of that, this utility model provides a kind of synchronous commutating control circuit and applies its Switching Power Supply, solves to become
Depressor winding self-device synchronous rectification produces the anti-problem filling electric current in start-up course.
For solving above-mentioned technical problem, the synchronous commutating control circuit that this utility model provides includes: Transformer Winding is certainly
Drive circuit of synchronous rectification, exporting change voltage sampling circuit and drive control circuit；Described Transformer Winding is self-driven same
Step rectification circuit includes two synchronous rectifiers；The input connecting valve power supply of described exporting change voltage sampling circuit
Output voltage, outfan connect the input driving control circuit；Two outfans of described driving control circuit connect respectively
Receive the control end of described two synchronous rectifier；
The change voltage of the Switching Power Supply output described in input collection of described exporting change voltage sampling circuit, raw
It is supplied to the input of described driving control circuit by its outfan after becoming sample rate current, described driving control circuit
Two outfans export control signal respectively and are supplied to the control end of described two synchronous rectifier；
When described Switching Power Supply starts or closes, described control signal drags down described two synchronous rectifier
Drive level, time delay a period of time again in start-up course or after starting, two synchronous rectifiers described in this time period are all
It is operated in its body diode rectification state；
When described Switching Power Supply enters steady operation, described driving control circuit is off state.
As a kind of specific embodiment of above-mentioned Transformer Winding self-device synchronous rectification circuit, also include that two are driven
Dynamic condenser；The described control end driving one of electric capacity to be series at one of described two synchronous rectifier and described switch electricity
Between one end of source auxiliary winding, the two of described driving electric capacity are series at the control end of the two of described two synchronous rectifier
And between the other end of described Switching Power Supply auxiliary winding.
As a kind of specific embodiment of exporting change voltage sampling circuit, including sampling capacitance C3 and current-limiting resistance
R1；One end of described sampling capacitance C3 is the input of described exporting change voltage sampling circuit, described sampling electricity
The other end holding C3 is connected to one end of described current-limiting resistance R1, and the other end of described current-limiting resistance R1 is described defeated
Go out to change the outfan of voltage sampling circuit.
As the modification of above-mentioned exporting change voltage sampling circuit specific embodiment, including sampling capacitance C3 and sampling
Resistance R1；One end of described sampling capacitance C3 is the input of described exporting change voltage sampling circuit, and described adopts
The other end of sample electric capacity C3 is connected to described Switching Power Supply secondary side reference point GND after described sampling resistor R1, described
The junction point of sampling capacitance C3 and described sampling resistor R1 is the outfan of described exporting change voltage sampling circuit.
As the improvement of above-mentioned two kinds of detailed description of the invention of exporting change voltage sampling circuit, also include discharge diode
D1, the negative electrode of described discharge diode D1 is connected to described sampling capacitance C3 and the junction point of described resistance R1, described
The anode of discharge diode D1 is connected to described Switching Power Supply secondary side reference point GND.
As a kind of specific embodiment of driving control circuit, including switch triode Q3, isolating diode D2,
Isolating diode D3；The base stage of described switch triode Q3 is the input of described driving control circuit, described switch
The emitter stage of audion Q3 is connected to described Switching Power Supply secondary side reference point GND, the colelctor electrode of described switch triode Q3
Be connected to described isolating diode D2 and the negative electrode of described isolating diode D3, the anode of described isolating diode D2 and
The anode of described isolating diode D3 is respectively two outfans of described driving control circuit.
As the equivalent of the specific embodiment of above-mentioned driving control circuit, including metal-oxide-semiconductor Q3, isolating diode
D2, isolating diode D3；The grid of described metal-oxide-semiconductor Q3 is the input of described driving control circuit, described metal-oxide-semiconductor Q3
Source electrode be connected to described Switching Power Supply secondary side reference point GND, the drain electrode of described metal-oxide-semiconductor Q3 is connected to described isolation two
Pole pipe D2 and the negative electrode of described isolating diode D3, the anode of described isolating diode D2 and described isolating diode D3
Anode be respectively two outfans of described driving control circuit.
Accordingly, this utility model also provides for applying the Switching Power Supply of above-mentioned synchronous commutating control circuit.
Operation principle of the present utility model will carry out labor in conjunction with the embodiments, be not repeated herein.
Note: in the application, the end that controls of synchronous rectifier is the terminal that control synchronous rectifier is opened and turned off, such as
When synchronous rectifier uses metal-oxide-semiconductor, the end that controls of synchronous rectifier is the grid of metal-oxide-semiconductor；When synchronous rectifier uses three
During the pipe of pole, the end that controls of synchronous rectifier is the base stage of audion.
Synchronous commutating control circuit of the present utility model, on the basis of original winding self-powered circuit of synchronous rectification, improves it
Start in Switching Power Supply or closing process produces the anti-defect filling electric current, preventing the continuous of Transformer Winding self-device synchronous rectification
The impaired probability of flow tube, is greatly improved the Switching Power Supply product of employing Transformer Winding self-device synchronous rectification circuit
Reliability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the Transformer Winding self-device synchronous rectification circuit of prior art；
Fig. 2 is Transformer Winding self-device synchronous rectification circuit and the current waveform of diode rectifier circuit of prior art
Figure；When wherein Fig. 2 A is diode rectification, the continuous current oscillogram under heavy duty, Fig. 2 B are gently to load down during diode rectification
Interrupted current oscillogram, Fig. 2 C when being self-device synchronous rectification the continuous current oscillogram under heavy duty, Fig. 2 D be self-driven
Continuous current oscillogram under gently loading during synchronous rectification；
Fig. 3 is the Transformer Winding self-device synchronous rectification circuit anti-waveform filling electric current in start-up course of prior art
Figure；
Fig. 4 is the synchronous commutation control device of this utility model case study on implementation one；
Fig. 5 is the oscillogram in start-up course of this utility model case study on implementation one circuit；
Fig. 6 is the synchronous commutation control device of this utility model case study on implementation two；
Fig. 7 is the synchronous commutation control device of this utility model case study on implementation three.
Detailed description of the invention
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one
Fig. 4 shows that the synchronous rectification of this utility model embodiment one drives control circuit, including Transformer Winding self-powered
Dynamic circuit of synchronous rectification 1, exporting change voltage sampling circuit 2 and driving control circuit 3；Transformer Winding self-device synchronous rectification
Circuit 1 includes two devices Q1 and Q2；The input connecting valve power supply of exporting change voltage sampling circuit 2
Output voltage Vo, outfan connect the input driving control circuit；Two outfans driving control circuit are connected respectively to
The grid of two devices Q1 and Q2；
Transformer Winding self-device synchronous rectification circuit relatively prior art also includes driving electric capacity C1 and driving electric capacity C2；Drive
One end of dynamic condenser C1 connects the one end driving winding N2, drives the other end of electric capacity C1 to be connected to the rectification MOS of synchronous rectification
The grid of pipe Q1；One end of the C2 of driving electric capacity connects the other end driving winding N2, drives the other end of electric capacity C2 to connect same
The grid of step rectification afterflow metal-oxide-semiconductor Q2；
Exporting change voltage sampling circuit includes sampling capacitance C3, current-limiting resistance R1；One end of sampling capacitance C3 is connected to
The output end vo of Switching Power Supply, the sampling capacitance C3 other end is connected to one end of current-limiting resistance R1, the other end of current-limiting resistance R1
Outfan for exporting change sample circuit；
Control circuit is driven to include switch triode Q3, isolating diode D2, isolating diode D3；Switch triode Q3's
Base stage is to drive the input of control circuit, is connected to the outfan of described exporting change sample circuit, switch triode Q3
Emitter stage be connected to Switching Power Supply secondary side reference point GND, the colelctor electrode of switch triode Q3 be connected to isolating diode D2 and
The negative electrode of isolating diode D3, the anode of isolating diode D2 is connected to the rectification of described winding self-powered circuit of synchronous rectification
The grid of metal-oxide-semiconductor Q1, the afterflow of the Transformer Winding self-device synchronous rectification circuit described in anode connection of isolating diode D3
The grid of metal-oxide-semiconductor Q2.
The principle Analysis of the present embodiment is as follows:
On startup, output voltage gradually rises modular power source, according to electric capacity every the characteristic of straight-through friendship, the output electricity of rising
Being pressed on the sampling capacitance C3 of exporting change voltage sampling circuit and generate sample rate current, sample rate current passes through current-limiting resistance R1 current limliting
After, supply drives the base-emitter of the switch triode Q3 of control circuit, causes its controlled guidance of colelctor electrode-emitter stage
Logical, the electric conduction stream of colelctor electrode-emitter stage passes through isolating diode D1, isolating diode D2, and drags down synchronous rectifier driving
Signal G1 and G2, allows synchronous rectifier Q1, Q2 be operated in its body diode rectification state.Thus prevent from being stored in output capacitance
Energy fill to power source internal is counter, it is to avoid the afterflow metal-oxide-semiconductor in synchronous rectifier counter is filled circuit damage by bigger.When switch electricity
When source enters steady operation, driving control circuit is off state, and driving control circuit is off state, does not affect this transformator
The work of winding self-device synchronous rectification circuit.
The present embodiment increases the reason of driving electric capacity C1 and C2 in Transformer Winding self-device synchronous rectification circuit:
During driving the colelctor electrode-emitter stage conducting of switch triode Q3 of control circuit, without drive electric capacity C1 and C2 every
From, by causing the two ends driving winding N2 by direct short-circuit, producing the biggest short circuit in winding electric current, switch triode Q3's will be by
Big short circuit current burns out.After increasing driving electric capacity C1 and C2, during switch triode Q3 turns on, electric capacity is driven to be formed relatively
Big impedance, gets final product the conducting electric current of electrode-transmitter pole, limit switch audion Q3 pole, ensures that the control pole of synchronous rectifier
It is pulled low.
Having the beneficial effect that of the present embodiment:
Fig. 5 is the beneficial effect figure of embodiment one, and the continued flow tube current waveform of comparison diagram 3, in the startup of Switching Power Supply
During journey t1-t2, owing to power supply exports current ratio relatively greatly in start-up course, outputting inductance L is operated in continuous duty, institute
With the continued flow tube electric current of Fig. 3 and Fig. 5 all as forward current.After power initiation completes, the continued flow tube waveform shown in Fig. 3 creates
Bigger reverse current, and the synchronous rectification continued flow tube current waveform of the present embodiment one shown in Fig. 5 drops to 0A, no current stream
Cross, so the present embodiment can solve the probability that continued flow tube is damaged by big reverse current.
Embodiment two
Fig. 6 shows that the synchronous rectification of this utility model embodiment two drives control circuit, and the difference with embodiment one is:
Exporting change voltage sampling circuit increases discharge diode D1, and its annexation is, the negative electrode of discharge diode D1
Being connected to sampling capacitance C3 and the junction point of current-limiting resistance R1, the anode of discharge diode D1 is connected to Switching Power Supply secondary side reference
Point GND.
The principle Analysis of the present embodiment is as follows:
Embodiment one circuit as shown in Figure 4, during when shutdown, output voltage declines, produces on sampling capacitance C3
On just descending negative voltage, after shutdown, this voltage can maintain in the short time, if Switching Power Supply starts at once, then can cause and hold
During closing being again started up of power supply, electric capacity C3 cannot gather electric current again；And the acting as of discharge diode D1, power supply closes
Just lower negative holding voltage on sampling capacitance C3 is discharged, it is ensured that this utility model dress during Switching Power Supply frequent starting after machine
Put and also can normally use.
Embodiment three
Fig. 7 shows that the synchronous rectification of this utility model embodiment three drives control circuit, and the difference with embodiment two is:
The current-limiting resistance R1 of exporting change voltage sampling circuit is removed, at discharge diode D1 two ends parallel connection sampling resistor
R1。
The audion Q3 driving control circuit is replaced for metal-oxide-semiconductor Q3, and the grid of metal-oxide-semiconductor Q3 is to drive control circuit
Input, the source electrode of metal-oxide-semiconductor Q3 is connected to Switching Power Supply secondary side reference point GND, and the drain electrode of metal-oxide-semiconductor Q3 is connected to isolating diode
D2 and the negative electrode of isolating diode D3, the anode of isolating diode D2 and isolating diode D3 be drive two of control circuit defeated
Go out end.
The operation principle of the present embodiment relatively embodiment one is slightly different, and is analyzed as follows:
On startup, output voltage gradually rises modular power source, according to electric capacity every the characteristic of straight-through friendship, the output electricity of rising
It is pressed on the sampling capacitance C3 of exporting change voltage sampling circuit and generates sample rate current, after sample rate current passes through sampling resistor R1,
The gate-source of the switch metal-oxide-semiconductor Q3 forming voltage supply driving control circuit causes the most controlled system conducting of its drain-source, drain-source pole
Electric conduction stream by isolating diode D1, isolating diode D2 drag down synchronous rectifier drive signal G1 and G2, allow synchronization whole
Flow tube Q1, Q2 are operated in its body diode rectification state.Thus prevent the energy being stored in output capacitance anti-to power source internal
Fill, it is to avoid the afterflow metal-oxide-semiconductor in synchronous rectifier counter is filled circuit damage by bigger.When Switching Power Supply enters steady operation,
Driving control circuit is off state, and driving control circuit is off state, does not affect this Transformer Winding self driven synchronous whole
The work of current circuit.
Synchronous commutation control device of the present utility model can be applied in various isolated topology, as flyback, normal shock, recommend,
Half-bridge, full-bridge etc. and the topology of conversion thereof.
Embodiment of the present utility model is not limited to this, according to foregoing of the present utility model, utilizes the general of this area
Logical technological know-how and customary means, without departing under this utility model above-mentioned basic fundamental thought premise, this utility model also may be used
To make the amendment of other various ways, to replace goods change, within the scope of all falling within this utility model rights protection.
Claims (8)
1. a synchronous commutating control circuit, including: Transformer Winding self-device synchronous rectification circuit, exporting change voltage sample
Circuit and driving control circuit；Described Transformer Winding self-device synchronous rectification circuit includes two synchronous rectifiers；Described
The output voltage of input connecting valve power supply of exporting change voltage sampling circuit, outfan connects and drives control circuit
Input；Two outfans of described driving control circuit are connected respectively to the control end of described two synchronous rectifier；
The change voltage of the Switching Power Supply output described in input collection of described exporting change voltage sampling circuit, generation is adopted
It is supplied to the input of described driving control circuit, two of described driving control circuit by its outfan after sample electric current
Outfan exports control signal respectively and is supplied to the control end of described two synchronous rectifier；
When described Switching Power Supply starts or closes, described control signal drags down the driving of described two synchronous rectifier
Level, time delay a period of time again in start-up course or after starting, two synchronous rectifiers described in this time period are all work
At its body diode rectification state；
When described Switching Power Supply enters steady operation, described driving control circuit is off state.
Synchronous commutating control circuit the most according to claim 1, it is characterised in that: described Transformer Winding is self-driven same
Step rectification circuit also includes that two drive electric capacity；Described one of the electric capacity that drives is series at one of described two synchronous rectifier
The one end controlling end and described Switching Power Supply auxiliary winding between, described drive the two of electric capacity to be series at described two
Between the other end controlling end and described Switching Power Supply auxiliary winding of the two of synchronous rectifier.
Synchronous commutating control circuit the most according to claim 1, it is characterised in that: described exporting change voltage sample electricity
Road includes sampling capacitance C3 and current-limiting resistance R1；One end of described sampling capacitance C3 is described exporting change voltage sample
The input of circuit, the other end of described sampling capacitance C3 is connected to one end of described current-limiting resistance R1, described current limliting
The other end of resistance R1 is the outfan of described exporting change voltage sampling circuit.
Synchronous commutating control circuit the most according to claim 1, it is characterised in that: described exporting change voltage sample electricity
Road includes sampling capacitance C3 and sampling resistor R1；One end of described sampling capacitance C3 is described exporting change voltage sample
The input of circuit, the other end of described sampling capacitance C3 is connected to described Switching Power Supply after described sampling resistor R1
Secondary side reference point (GND), the junction point of described sampling capacitance C3 and described sampling resistor R1 is described exporting change
The outfan of voltage sampling circuit.
5. according to the synchronous commutating control circuit described in claim 3 or 4, it is characterised in that: described exporting change voltage is adopted
Sample circuit also includes that discharge diode D1, the negative electrode of described discharge diode D1 are connected to described sampling capacitance C3 and described
The junction point of resistance R1, the anode of described discharge diode D1 is connected to described Switching Power Supply secondary side reference point (GND).
Synchronous commutating control circuit the most according to claim 1, it is characterised in that: described driving control circuit includes out
Close audion Q3, isolating diode D2, isolating diode D3；The base stage of described switch triode Q3 is that described driving controls
The input of circuit, the emitter stage of described switch triode Q3 is connected to described Switching Power Supply secondary side reference point (GND), institute
The colelctor electrode of the switch triode Q3 stated is connected to described isolating diode D2 and the negative electrode of described isolating diode D3, institute
The anode of the isolating diode D2 stated and the anode of described isolating diode D3 are respectively the two of described driving control circuit
Individual outfan.
Synchronous commutating control circuit the most according to claim 1, it is characterised in that: described driving control circuit includes
Metal-oxide-semiconductor Q3, isolating diode D2, isolating diode D3；The grid of described metal-oxide-semiconductor Q3 is the defeated of described driving control circuit
Entering end, the source electrode of described metal-oxide-semiconductor Q3 is connected to described Switching Power Supply secondary side reference point (GND), the leakage of described metal-oxide-semiconductor Q3
Pole is connected to described isolating diode D2 and the negative electrode of described isolating diode D3, the anode of described isolating diode D2
Anode with described isolating diode D3 is respectively two outfans of described driving control circuit.
8. the Switching Power Supply of the synchronous commutating control circuit applied described in any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620188423.5U CN205596031U (en) | 2016-03-11 | 2016-03-11 | Synchronous Rectifier control circuit and use its switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620188423.5U CN205596031U (en) | 2016-03-11 | 2016-03-11 | Synchronous Rectifier control circuit and use its switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205596031U true CN205596031U (en) | 2016-09-21 |
Family
ID=56928554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620188423.5U Active CN205596031U (en) | 2016-03-11 | 2016-03-11 | Synchronous Rectifier control circuit and use its switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205596031U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703642A (en) * | 2016-03-11 | 2016-06-22 | 广州金升阳科技有限公司 | Synchronous rectifier control circuit, method and switching power supply provided with same |
| CN114785167A (en) * | 2022-03-23 | 2022-07-22 | 电子科技大学 | Controllable rectifying circuit and voltage stabilization control method thereof |
-
2016
- 2016-03-11 CN CN201620188423.5U patent/CN205596031U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703642A (en) * | 2016-03-11 | 2016-06-22 | 广州金升阳科技有限公司 | Synchronous rectifier control circuit, method and switching power supply provided with same |
| CN114785167A (en) * | 2022-03-23 | 2022-07-22 | 电子科技大学 | Controllable rectifying circuit and voltage stabilization control method thereof |
| CN114785167B (en) * | 2022-03-23 | 2023-04-07 | 电子科技大学 | Controllable rectification circuit and voltage stabilization control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105703642A (en) | Synchronous rectifier control circuit, method and switching power supply provided with same | |
| CN104485806B (en) | Bootstrap voltage refresh control circuit, voltage conversion circuit and control method thereof | |
| CN104218806A (en) | Method and circuit for controlling fly-back switching power supplies of zero-voltage switches | |
| CN104319983B (en) | A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply | |
| CN104396132B (en) | Switching power supply device | |
| CN103795260A (en) | Non-complementary flyback active clamp converter | |
| CN102983760A (en) | Flyback switching power system and constant current controller thereof | |
| CN103066855A (en) | System and method used for no-voltage switch in power source transformation system | |
| CN103904901A (en) | Phase-shift full-bridge converter circuit and control method | |
| CN105006966A (en) | Switching power supply control chip and flyback AC-DC converter | |
| CN104602390A (en) | Dual-winding single-stage primary feedback LED (Light Emitting Diode) lamp drive circuit | |
| CN103248221A (en) | Voltage reduction converter | |
| CN103269161A (en) | Constant-current output BUCK power circuit | |
| CN101976940A (en) | Drive bootstrap circuit for switching tube of switching power supply converter | |
| CN104009633A (en) | Current continuous type high-gain DC-DC converter circuit | |
| CN203313500U (en) | Silicon controlled dimming LED driving circuit | |
| CN205596031U (en) | Synchronous Rectifier control circuit and use its switching power supply | |
| CN201629731U (en) | Bootstrap circuit with reinforced low voltage | |
| CN103997223B (en) | A kind of synchronous rectification driving circuit | |
| Hasanpour et al. | A new soft-switched high step-up trans-inverse DC/DC converter based on built-in transformer | |
| CN202759634U (en) | LED drive circuit without auxiliary winding | |
| CN207664888U (en) | High efficiency full bridge rectifier | |
| CN206962707U (en) | A kind of dynamic compesated control circuit for synchronous rectification power inverter | |
| CN107482921A (en) | A kind of two-way DC DC converters | |
| CN205847090U (en) | A kind of mixed type quasi-boost switching DC DC changer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |