CN108683336B - A kind of inverse-excitation type active clamp driving circuit - Google Patents
A kind of inverse-excitation type active clamp driving circuit Download PDFInfo
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- CN108683336B CN108683336B CN201810352664.2A CN201810352664A CN108683336B CN 108683336 B CN108683336 B CN 108683336B CN 201810352664 A CN201810352664 A CN 201810352664A CN 108683336 B CN108683336 B CN 108683336B
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Power Engineering (AREA)
- Manipulation Of Pulses (AREA)
Abstract
The present invention provides a kind of inverse-excitation type active clamp driving circuit, this circuit is simple, reliable, stable.During the raising or reduction of the input voltage of driving circuit of the invention, duty ratio is also being changed correspondingly, and the voltage of the driver of clamper tube drive circuit keeps stablizing, and does not change with the variation of input voltage；Without being further added by transformer winding, and product integrability designs；Without increasing device, cost is reduced；Bootstrap diode is not needed, the loss of product is reduced, improves the efficiency of product.
Description
Technical field
The present invention relates to a kind of driving circuit, it is related specifically to the driving of inverse-excitation type active clamp circuit in Switching Power Supply
Circuit.
Background technique
It is well known that difference of the inverse-excitation type active clamp circuit according to clamp networks, there are two types of circuit structures, and one is height
The inverse-excitation type active clamp circuit of side clamper, clamp networks are another using the N-channel field-effect tube as main switch
It is the inverse-excitation type active clamp circuit of low side clamper, clamp networks use P-channel field-effect transistor (PEFT) pipe.Due to P-channel field-effect transistor (PEFT) pipe
It is at high cost, and its drain-source voltage stress is typically not greater than 200VDC, thus its use scope is very limited, usually we make
With the inverse-excitation type active clamp circuit of flash clamper, so, the N-channel field-effect tube in clamp networks, which needs to be isolated, is driven
Dynamic, it is clamper tube that usually we, which are the N-channel field-effect tube in clamp networks,.
There are two types of mode, one kind being referred to as grid for the clamper tube driving of the inverse-excitation type active clamp circuit of traditional flash clamper
Boostrap circuit is driven, another is referred to as magnetic isolation drive circuit.
The circuit diagram of traditional gate driving boostrap circuit is as shown in Fig. 1, its working principle is that: pulse signal controls N
The turn-on and turn-off of channel field-effect pipe Q1, when Q1 conducting, the drain electrode of Q1 is pulled down to ground, and Vcc passes through D2 pairs at this time
C3 charges, and voltage is charged to Vcc.When Q1 driving pulse is low level, Q1 shutdown, the drain voltage of Q1 is increased to
Vin+NVo (the wherein turn ratio that N is primary and secondary side), because the voltage above C2 capacitor cannot be mutated, the voltage at the both ends C2
It is still Vg2, for driving, auxiliary pipe Q2's is open-minded.
The effect of diode D2 is limiting capacitance C3 feedback current to Vcc, so that the charge above capacitor C3 be allowed all to use
In the driving of Q2.This C3 capacitor is commonly referred to as bootstrap capacitor, the Ultrafast recovery two that diode D2 needs to select recovery characteristics good
Pole pipe, caused by preventing because of its Reverse recovery on C3 capacitor surface charge deficiency to causing the driving to N-channel field-effect tube Q2 not
Foot.
Traditional gate driving boostrap circuit, for D2 in circuit because there are the processes of Reverse recovery, there are following several
Point problem:
1. parts selection limits.The reverse recovery time of Schottky diode is within 10ns, and stress is within 200V；
The reverse recovery time of Ultrafast recovery diode, stress generally can achieve 1000V within 100ns.Low pressure is inputted
DC-DC product, D2 can choose Schottky diode, and for the product of AC-DC input, D2 generally chooses ultrafast pipe；
2. reverse recovery loss.The product of AC-DC input, D2 selects ultrafast pipe, after scene effect pipe Q1 shutdown, field effect
Should the drain voltage of pipe Q1 rise very rapidly up to (Vin+NVo), diode D2 exists from forward conduction to the time memory reversely turned off
Reverse recovery loss sacrifices the efficiency of product；
3. influencing bootstrap capacitor voltage.The reverse recovery time of ultrafast pipe is diode D3 Reverse recovery mistake within 100ns
Cheng Zhong, reverse recovery current extract the charge on bootstrap capacitor C3, easily cause the voltage of bootstrap capacitor C3 to decline, seriously will affect
The driving of clamper tube Q2.
The circuit diagram of traditional magnetic isolation drive circuit is as shown in Fig. 2, and wherein capacitor C1 is input terminal capacitance, T1
For isolating transformer, Q0 is driven flash N-channel field-effect tube, and Cgs is the equivalent input capacitance of Q0.V1 is pulse width
The output voltage of modulating driver, Vp are the voltage of transformer inputs, and Vs is the output voltage of the Magnetic isolation driver, Fig. 2
Shown circuit waveform please refers to shown in Fig. 3.Assuming that the period of the driver output signal is T, duty ratio D, amplitude when stable state
For Vcc, while assuming that the input and output turn ratio of transformer T1 is 1, then voltage when stable state on input terminal capacitance C1 is
DVcc.Its working principle is that:
When V1 is high level, Vs is also high level, and amplitude is (V1-Vc1), i.e. (1-D) Vcc.
When V1 is low level, Vs is negative level, and amplitude is (- Vc1), i.e. DVcc.
Traditional magnetic isolation drive circuit defect are as follows:
1. when input voltage raising is to cause the duty ratio D of driver smaller, high level of the voltage signal (1-D) Vcc of Vs
It is larger, it can exceed that the maximum voltage that the Vgs of Q0 is able to bear, to cause the damage of Q0；
2. the target of current production development is integration and miniaturization, especially more and more transformers are become using plane
The design of depressor, the limitation of flat surface transformer are the quantity of the line footpath of winding, the number of turns and winding, and Magnetic isolation driving needs to add one
A winding, it is very unfavorable to the integration and miniaturization design of product.
Based on above two traditional driving circuit, the present inventor furthers investigate for existing isolation drive device, and
It is repeatedly improved, thus this case generates.
Summary of the invention
The present invention discloses a kind of inverse-excitation type active clamp circuit driving circuit more particularly to inverse-excitation type active clamp circuit
Clamper tube drive circuit, this circuit is simple, it is reliable, stablize, do not change with the variation of input voltage, without two poles of booting
Pipe, avoids reverse recovery loss, without increasing transformer winding, can integrate, save the cost.
The purpose of the present invention is achieved through the following technical solutions: a kind of inverse-excitation type active clamp driving circuit, packet
Include inverse-excitation type active clamp circuit, clamper tube drive circuit；Inverse-excitation type active clamp circuit includes a transformer, the first N-channel
Field-effect tube, first capacitor, the second capacitor, first diode, a clamp networks, transformer include primary side winding, vice-side winding,
Clamp networks include at least anode and cathode, the anode connection at vice-side winding different name end and first diode, first diode yin
Pole is connect with second capacitor one end, and forms output just, and vice-side winding Same Name of Ends is connect with the second capacitor other end, and is formed defeated
It bears out；The anode of input DC power simultaneously with one end of first capacitor, primary side winding Same Name of Ends, clamp networks cathode phase
Even, primary side winding different name end is connected with the drain electrode of the anode of clamp networks, the first N-channel field-effect tube；First N-channel field-effect
The other end of the source electrode connection first capacitor of pipe, tie point connect the negative terminal of input DC power, the first N-channel field-effect simultaneously
The grid of pipe connects driving control signal；Clamp networks include at least third capacitor, the 4th capacitor and the second N-channel field-effect
Pipe, third capacitor, the 4th capacitor and the second N-channel field-effect tube three series connection, series system are one of following two mode:
(1) mode one: one end of third capacitor is the anode of clamp networks, and the other end of third capacitor connects the 4th capacitor
One end, the other end of the 4th capacitor connects the source electrode of the second N-channel field-effect tube, and the drain electrode of the second N-channel field-effect tube is
The cathode of clamp networks, the output port of the grid connection driver of the second N-channel field-effect tube；
(2) one end of two: the four capacitor of mode is the anode of clamp networks, and the other end of the 4th capacitor connects the 2nd N ditch
The source electrode of road field-effect tube, one end of the drain electrode connection third capacitor of the second N-channel field-effect tube, the other end of third capacitor are
The cathode of clamp networks, the output port of the grid connection driver of the second N-channel field-effect tube.
Clamper tube drive circuit includes a driver, and driver is included but are not limited to lower port: input port, output
Port, supply port, floating ground port, input port connect control signal, and output port is that the grid of the second N-channel field-effect tube mentions
For clamp control signals, its connection type is divided into two kinds according to the mode of clamp networks for supply port and floating ground port:
(1) according to the clamp networks of mode one, floating ground port connects the source electrode of the 4th capacitor and the second N-channel field-effect tube
Connecting node, supply port connect the connecting node of the 4th capacitor and third capacitor；
(2) according to the clamp networks of mode two, floating ground port connects the source electrode of the 4th capacitor and the second N-channel field-effect tube
Connecting node, supply port connect the anode of clamp networks.
In inverse-excitation type active clamp circuit, the voltage of the driver of clamper tube drive circuit by clamp networks the 4th capacitor
It provides.
The first improvement as above scheme, it is characterised in that: in the in parallel third diode in the 4th capacitor both ends, the
The anode of three diodes connects the connecting node of the 4th capacitor and driver floating ground port, and the cathode of third diode is according to clamper net
Its connection type of the mode of network is divided into two kinds and is divided into two kinds:
(1) according to the clamp networks of mode one, the cathode of third diode connects the connection section of the 4th capacitor Yu third capacitor
Point；
(2) according to the clamp networks of mode two, the cathode of third diode connects the anode of clamp networks.
It further include a rectifying and wave-filtering network, rectifying and wave-filtering network includes the 4th diode and the 5th capacitor, the four or two pole
The cathode of the anode connection third diode of pipe, the cathode of the 4th diode connect one end of the 5th capacitor and the power supply of driver
Port；The other end of 5th capacitor is connected to the floating ground port of driver.
Second of improvement as above scheme, it is characterised in that: in a third capacitor both ends voltage-stabiliser tube in parallel, voltage-stabiliser tube
Connection type according to there are two types of the differences of clamp networks:
(1) according to the clamp networks of mode one, the anode of voltage-stabiliser tube connects the node of third capacitor and the 4th capacitor, voltage-stabiliser tube
Cathode connect the anodes of clamp networks；
(2) according to the clamp networks of mode two, the cathode of voltage-stabiliser tube connects third capacitor and the second N-channel FET drain
Connecting node, the anode of voltage-stabiliser tube connects the cathode of clamp networks.
The third improvement as above scheme, it is characterised in that: in a 4th capacitor both ends third diode in parallel, In
One voltage-stabiliser tube of third capacitor both ends parallel connection.The anode of third diode connects the node of the 4th capacitor and driver floating ground port, the
The cathode of three diodes is divided into two kinds according to the mode of clamp networks its connection type and is divided into two kinds:
(1) according to the clamp networks of mode one, the cathode of third diode connects the connection section of the 4th capacitor Yu third capacitor
Point；
(2) according to the clamp networks of mode two, the cathode of third diode connects the anode of clamp networks.
It further include a rectifying and wave-filtering network, rectifying and wave-filtering network includes the 4th diode and the 5th capacitor, the four or two pole
The cathode of the anode connection third diode of pipe, the cathode of the 4th diode connect one end of the 5th capacitor and the power supply of driver
Port；The other end of 5th capacitor is connected to the floating ground port of driver.The connection type of voltage-stabiliser tube according to clamp networks not
With there are two types of:
(1) according to the clamp networks of mode one, the anode of voltage-stabiliser tube connects the connecting node of third capacitor and the 4th capacitor, surely
The cathode of pressure pipe connects the anode of clamp networks；
(2) according to the clamp networks of mode two, the cathode of voltage-stabiliser tube connects third capacitor and the second N-channel FET drain
Connecting node, the anode of voltage-stabiliser tube connects the cathode of clamp networks.
The working principle of the invention will be explained in detail in conjunction with example, and bring of the present invention has the beneficial effect that
1. duty ratio is also changing correspondingly, and clamper tube drive circuit during the raising or reduction of input voltage
Driver voltage keep stablize, do not change with the variation of input voltage；
2. without being further added by transformer winding, and product integrability designs；
3. reducing cost without increasing device；
4. not needing bootstrap diode, the loss of product is reduced, improves the efficiency of product.
Detailed description of the invention
Fig. 1 is the circuit diagram of prior art gate driving boostrap circuit；
Fig. 2 is the circuit diagram of prior art magnetic isolation drive circuit；
Fig. 3 is the voltage oscillogram of the key point of Fig. 2；
Fig. 4 is one of first embodiment of the present invention schematic diagram, clamp networks employing mode one；
Fig. 5 is one of first embodiment of the present invention schematic diagram, clamp networks employing mode two；
Fig. 6 is first embodiment of the present invention waveform；
Fig. 7 is one of schematic diagram of the second embodiment of the present invention, clamp networks employing mode one；
Fig. 8 is one of schematic diagram of the second embodiment of the present invention, clamp networks employing mode two；
Fig. 9 is one of schematic diagram of the third embodiment of the present invention, clamp networks employing mode one；
Figure 10 is one of schematic diagram of the third embodiment of the present invention, clamp networks employing mode two；
Figure 11 is one of schematic diagram of the fourth embodiment of the present invention, clamp networks employing mode one；
Figure 12 is one of schematic diagram of the fourth embodiment of the present invention, clamp networks employing mode two.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and embodiments.
Embodiment one
Fig. 4 and Fig. 5 shows the clamper tube drive circuit of the inverse-excitation type active clamp circuit of first embodiment of the invention
Schematic diagram, including transformer a T1, the first N-channel field-effect tube Q1, first capacitor C1, the second capacitor C2, first diode D1,
Clamp networks 1, transformer T1 include primary side winding Np and vice-side winding Ns, and clamp networks 1 include at least cathode and anode, secondary side
Winding Ns different name end is connect with first diode D1 anode, and first diode D1 cathode is connect with second one end capacitor C2, and shape
Just at output, vice-side winding Ns Same Name of Ends is connect with the second capacitor C2 other end, and forms output ground 0V；Input DC power
The anode Vin+ of Vin is connected with the cathode of the one end first capacitor C1, primary side winding Np Same Name of Ends, clamp networks 1 simultaneously, primary side around
Group Np different name end is connected with the drain electrode of the anode of clamp networks 1, the first N-channel field-effect tube Q1；First N-channel field-effect tube Q1
Source electrode connection first capacitor C1 the other end, tie point connects the negative terminal Vin- of input DC power Vin, the first N ditch simultaneously
The grid of road field-effect tube Q1 connects driving control signal, and clamp networks 1 include at least third capacitor C3, the 4th capacitor C4 and the
Two N-channel field-effect tube Q2, third capacitor C3, the 4th capacitor C4 and the second N-channel field-effect tube Q2 three series connection, series system
For one of following two mode:
(1) mode one: one end of third capacitor C3 is the anode of clamp networks 1, the other end connection the of third capacitor C3
One end of four capacitor C4, the other end of the 4th capacitor C4 connect the source electrode of the second N-channel field-effect tube Q2, the second N-channel field effect
Should pipe Q2 drain electrode be clamp networks 1 cathode, the grid of the second N-channel field-effect tube Q2 connects clamp control signals；
(2) mode two: one end of third capacitor C3 is the cathode of clamp networks 1, the other end connection the of third capacitor C3
The drain electrode of two N-channel field-effect tube Q2, the source electrode of the second N-channel field-effect tube Q2 connect one end of the 4th capacitor C4, the 4th electricity
The other end for holding C4 is the anode of clamp networks 1, and the grid of the second N-channel field-effect tube Q2 connects clamp control signals.
Clamper tube drive circuit includes a driver U1, and driver U1 is included but are not limited to lower port: input port
IN, output port OUT, supply port VB, floating ground port VS, input port IN connect input control signal, and output port OUT is the
The grid of two N-channel field-effect tube Q2 provides clamp control signals, and supply port VB and floating ground port VS are according to clamp networks 1
Mode difference is divided into two kinds:
(1) according to the clamp networks 1 of mode one, floating ground port VS meets the 4th capacitor C4 and the second N-channel field-effect tube Q2
Source electrode node, supply port VB connects the other end of the 4th capacitor C4；
(2) according to the clamp networks 1 of mode two, floating ground port VS meets the 4th capacitor C4 and the second N-channel field-effect tube Q2
Source electrode node, supply port VB connects the anode of clamp networks 1.
In inverse-excitation type active clamp circuit, the voltage of the driver U1 of clamper tube drive circuit is by the 4th of clamp networks 1
Capacitor C4 is provided.
Same Name of Ends: with one end of black dots mark in winding in figure；
Different name end: there is no one end of black dots mark in figure in winding；
Driving control signal: including pwm pulse bandwidth modulation signals, the various square waves such as PFM pulse frequency modulated；
Clamp control signals: including pwm pulse bandwidth modulation signals, the various square waves such as PFM pulse frequency modulated, with driving
It is different to control signal phase, it can complementary or incomplementarity；
In conjunction with the work wave of Fig. 6, the working principle of Fig. 4 circuit diagram is illustrated are as follows:
T0 moment, Q1 conducting, Q2 have been switched off before this, and input voltage vin gives magnetizing inductance degaussing, excitation electricity first
Flow ILmIt is 0 that negative sense, which decreases up to, and input voltage vin starts to give magnetizing inductance forward direction excitation, excitation current I laterLmOn linear
It rises.
T1 moment Q1 shutdown, into dead time, primary current starts to reduce, the parasitic capacitance charging of Q1, the parasitism of Q2
Capacitor electric discharge, the voltage at the both ends clamp capacitor C3 and C4 remains unchanged, and the voltage at the both ends C4 is equal to
The t2 moment, the drain-source step voltage of Q1 is charged to be more than (Vin+NVo) after, the electric current of primary side flows through two pole of body of Q2
Pipe, while pair side rectifier diode D1 is connected, leakage inductance LK(clamp capacitor refers to the electricity after C3 and C4 series connection with clamp capacitor
Hold, is equal toHereafter outside non-specific explanation, clamp capacitor refers to the capacitor after C3 and C4 series connection) resonance, together
When Q1 drain-source step voltage be clamped at (Vin+NVo).
T3 moment Q2 no-voltage is open-minded, clamp capacitor C3, C4 and leakage inductance LKResonance, leakage inductance electric current ILKContinue to clamp capacitor
C3 and C4 charging.Excitation current ILmContinue to be reduced to after 0, since the effect of clamp capacitor C3 and C4 start inverse-exciting.
T4 moment Q2 shutdown, resonance current ICRIt does not catch up with excitation current I alsoLm, secondary side is there are also electric current presence, when t4 to t5
Between in section Q2 be held off, resonant tank is by original clamp capacitor C3, C4 and leakage inductance LKResonance becomes the junction capacity of Q2 and Q1
With leakage inductance LKResonance, harmonic period is reduced rapidly.
T5 moment resonance current ICRIt catch up with excitation current ILm, secondary current ID1It is reduced to 0 rapidly, it is humorous in t4 to the t5 period
The energy for circuit extraction Q1 junction capacity of shaking, guarantees open-minded in t5 moment Q1 no-voltage.
Wherein, third capacitor C3 and the voltage at the 4th both ends capacitor C4 are equal to NVO, a left side it is negative and it is right just, third capacitor C3 and
The voltage stabilization at the 4th both ends capacitor C4, ripple is smaller, the partial pressure calculation formula above the 4th capacitor C4 are as follows:
By the value for rationally designing third capacitor C3 and the 4th capacitor C4, so that it may obtain suitable VC4 and be driven to clamper
The driver U1 of circuit powers, to drive clamper tube Q2.
Embodiment two
Fig. 7 and Fig. 8 is second of improved procedure of embodiment one, by taking Fig. 7 of clamp networks employing mode one as an example, to reality
Apply the further explanation of example two.In embodiment one, when exciting current is larger or third capacitor C3 is much larger than the 4th capacitor C4, the
The ripple voltage of four capacitor C4 is larger or even the voltage of the 4th capacitor C4 may be to zero.In the 4th capacitor C4 two in embodiment two
Third diode D3 in parallel is held, and increases the rectifying and wave-filtering network being made of the 4th diode D4, the 5th capacitor C5.Pass through rectification
Filter network, the 5th both ends capacitor C5 can obtain stable voltage, make the supply voltage of driver U1 keep stablizing, then make
The gate drive level of second N-channel field-effect tube Q2 is stablized.In the clamp networks of mode one, the anode of third diode D3 with
One end of 4th capacitor C4, one end of the 5th capacitor C5, the source electrode of the second N-channel field-effect tube Q2, driver U1 floating ground terminal
Connection；The cathode and the other end of the 4th capacitor C4 of third diode D3, the anode of clamp networks, the 4th diode D4 anode
Connection；The cathode of 4th diode D4 is connect with the feeder ear of the other end of the 5th capacitor C5, driver；
If clamp networks employing mode two, second of improved procedure of embodiment one as shown in figure 8, mode two clamper
In network, the anode of third diode D3 and one end of the 4th capacitor C4, one end of the 5th capacitor C5, the second N-channel field-effect
The floating ground terminal connection of the source electrode, driver U1 of pipe Q2；The cathode of third diode D3 and anode, the 4th diode of clamp networks
The anode of D4 connects；The cathode of 4th diode D4 is connect with the feeder ear of the other end of the 5th capacitor C5, driver U1.Clamper
The principle of network employing mode two is almost the same for the moment with clamp networks employing mode.
Embodiment three
Fig. 9 and Figure 10 is second of improved procedure of the first embodiment of the present invention, and mode one is respectively adopted in clamp networks
With mode two.In embodiment one, when the driving current of the second N-channel field-effect tube Q2 is larger, the 4th capacitor C4 voltage is easy
It gradually reduces, third capacitor C3 voltage is easy gradually to be lifted.In embodiment two, pass through a pressure stabilizing in parallel on third capacitor
Pipe D2 can maintain the stabilization of third capacitor and the 4th capacitor both end voltage respectively, stablize so as to the 4th capacitor to driver and supply
Electricity.One end of the cathode connection C3 of D2, the other end of the anode connection C3 of D2.
Example IV
Figure 11, Figure 12 are the third improved procedure of embodiment one, and mode one and mode two is respectively adopted in clamp networks.This
Improved procedure is another improved procedure of the first improved procedure in conjunction with second of improved procedure.
It is disclosed above to be merely a preferred embodiment of the present invention, but the present invention is not limited to this, such as in clamp circuit
Increase the methods of the 5th capacitor above, any those skilled in the art is right under the premise of without departing from core of the invention thought
Several modifications that the present invention carries out should fall in protection scope of the claims in the present invention etc.
Claims (5)
1. a kind of inverse-excitation type active clamp driving circuit, including inverse-excitation type active clamp circuit, clamper tube drive circuit；Described
Inverse-excitation type active clamp circuit includes a transformer, the first N-channel field-effect tube, first capacitor, the second capacitor and the one or two pole
Pipe, transformer include primary side winding, vice-side winding, the anode connection at vice-side winding different name end and first diode, the one or two pole
Tube cathode is connect with second capacitor one end, and forms output just, and vice-side winding Same Name of Ends is connect with the second capacitor other end, and shape
It is negative at output；The anode of input DC power is connected with one end of first capacitor, primary side winding Same Name of Ends simultaneously, and primary side winding is different
Name end is connected with the drain electrode of the first N-channel field-effect tube；The source electrode of first N-channel field-effect tube connects the another of first capacitor
End, tie point connect the negative terminal of input DC power simultaneously, and the grid of the first N-channel field-effect tube connects driving control signal,
It is characterized by: the inverse-excitation type active clamp circuit further includes clamp networks, the anode of the clamp networks connects institute
State the different name end of primary side winding, the anode of the cathode connection input DC power of the clamp networks；
The clamper tube drive circuit includes a driver, and the driver includes with lower port: input port, output end
Mouth, supply port, floating ground port, the input port connect clamp control signals, and the output port is the clamper
Network provides control signal, and the clamp networks provide supply voltage by supply port for the driver, described
Clamp networks pass through floating ground port simultaneously and provide for the driver with reference to ground.
2. a kind of inverse-excitation type active clamp driving circuit according to claim 1, it is characterised in that: the clamp networks
Including third capacitor, the 4th capacitor and the second N-channel field-effect tube, the third capacitor, the 4th capacitor and the second N-channel field
The connection relationship of effect pipe is one of following two mode:
Mode one: one end of the third capacitor is the anode of the clamp networks, the other end of the third capacitor
One end of connection the 4th capacitor, the other end connection of the 4th capacitor second N-channel field-effect tube
Source electrode, the drain electrode of the second N-channel field-effect tube are the cathode of the clamp networks, the second N-channel field effect
Should the grid of pipe connect the output port of the driver；One end of 4th capacitor connects the feeder ear of the driver
Mouthful, supply voltage is provided for the driver；The source electrode of the second N-channel field-effect tube connects the floating ground terminal of the driver
Mouthful；
Mode two: one end of the 4th capacitor is the anode of the clamp networks, the other end of the 4th capacitor
The source electrode of the connection second N-channel field-effect tube, the drain electrode connection of the second N-channel field-effect tube third
One end of capacitor, the other end of the third capacitor are the cathode of the clamp networks, the second N-channel field-effect
The grid of pipe connects the output port of the driver；One end of 4th capacitor connects the feeder ear of the driver
Mouthful, supply voltage is provided for the driver；The source electrode of the second N-channel field-effect tube connects the floating ground terminal of the driver
Mouthful.
3. a kind of inverse-excitation type active clamp driving circuit according to claim 2, it is characterised in that: the 4th capacitor
Both ends third diode in parallel, the cathode of the third diode connects one end of the 4th capacitor, described the
The anode of three diodes connects the other end of the 4th capacitor；It further include a rectifying and wave-filtering network, the rectifying and wave-filtering
Network include the 4th diode and the 5th capacitor, the 4th diode anode connection third diode cathode, the four or two
The cathode of pole pipe connects one end of the 5th capacitor and the supply port of driver；The other end of 5th capacitor is connected to driver
Floating ground port.
4. a kind of inverse-excitation type active clamp driving circuit according to claim 2 or 3, it is characterised in that: the clamper
The third capacitor both ends of a network voltage-stabiliser tube in parallel, the cathode of the voltage-stabiliser tube connects one end of the third capacitor, described
The anode of voltage-stabiliser tube connect the other end of the third capacitor.
5. a kind of inverse-excitation type active clamp driving circuit according to claim 4, it is characterised in that: the clamp networks
The 4th capacitor and third capacitor be a capacitor respectively, or be in series or in parallel to form respectively by multiple capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201810352664.2A CN108683336B (en) | 2018-04-19 | 2018-04-19 | A kind of inverse-excitation type active clamp driving circuit |
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| CN108683336B true CN108683336B (en) | 2019-10-29 |
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| US10418912B2 (en) | 2017-12-21 | 2019-09-17 | Silanna Asia Pte Ltd | Power converter with active clamp |
| US10707766B2 (en) | 2018-02-02 | 2020-07-07 | Silanna Asia Pte Ltd | Integrated self-driven active clamp |
| US10461626B1 (en) | 2019-01-14 | 2019-10-29 | Silanna Asia Pte Ltd | Active clamp circuit |
| US10673342B1 (en) * | 2019-05-02 | 2020-06-02 | Silanna Asia Pte Ltd | Active clamping with bootstrap circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5455757A (en) * | 1994-01-28 | 1995-10-03 | Compaq Computer Corp. | Power converter having regeneration circuit for reducing oscillations |
| CN104300795A (en) * | 2014-10-11 | 2015-01-21 | 广州金升阳科技有限公司 | Flyback converter and control method of flyback converter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5455757A (en) * | 1994-01-28 | 1995-10-03 | Compaq Computer Corp. | Power converter having regeneration circuit for reducing oscillations |
| CN104300795A (en) * | 2014-10-11 | 2015-01-21 | 广州金升阳科技有限公司 | Flyback converter and control method of flyback converter |
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