CN101237189A - Positive activation converter - Google Patents
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- CN101237189A CN101237189A CNA2007100018664A CN200710001866A CN101237189A CN 101237189 A CN101237189 A CN 101237189A CN A2007100018664 A CNA2007100018664 A CN A2007100018664A CN 200710001866 A CN200710001866 A CN 200710001866A CN 101237189 A CN101237189 A CN 101237189A
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Abstract
The invention discloses a forward converter, which comprises a power source, an input control circuit, a transformer and a rectifier-filter circuit. The input control circuit has a main switching diode, and the rectifier-filter circuit comprises a rectifier tube and a N-channel JFET forward diode, and the gate of the rectifier tube and the drain of the forward diode are connected to a positive dotted terminal of a transformer secondary principal winding, and the drain of the rectifier tube is connected to the other end of the transformer secondary principal winding, and a source electrode of the forward diode and a source electrode of the rectifier are connected to a common output ground. The transformer has a secondary winding for outputting drive control signals, and a drive circuit for providing pulse drive signals to the forward diode is arranged between the secondary winding and the gate of the forward diode. On-and-off of the JFET forward diode is controlled by voltage signals of the transformer winding so that the forward converter works in a synchronous rectifier state. The drive signals are directly from the transformer winding so that no special driver is needed and no additional power supply is needed, which makes the forward converter simple and reliable.
Description
Technical field
The present invention relates to the power conversion apparatus of application of synchronized commutation technique, especially relate to a kind of forward converter.
Background technology
In recent years, be to adopt synchronous rectification in a most important development aspect the low-voltage power transfer.Realize rectifier system with respect to traditional diode, synchronous rectification has reduced the conduction voltage drop of rectified power device significantly, thereby has reduced the conduction loss of rectifying device, has promoted the complete machine conversion efficiency of converter.Because the superperformance of MOSFET (mos field effect transistor) is realized the rectifying tube of synchronous rectification and the MOSFET that continued flow tube adopts low conduction impedance basically at present.A kind of JFET (junction field effect transistor) that is applicable to synchronous rectification has appearred recently.With respect to traditional JFET, new JFET manufacturing technology is significantly improved.Traditional JFET is applied to the little current applications of small-power more.New JFET is having very big breakthrough aspect conduction impedance, the conducting electric current, and particularly depletion type power JFET has the similar characteristic with Low ESR MOSFET.MOSFET with respect to low conduction impedance, depletion type JFET is except having similar 3m Ω～4m Ω conduction impedance, also has faster switching speed, parameters such as its low gate charge, rise time, fall time all are better than similar MOSFET, JFET does not have body diode, also can in add Schottky diode, manufacturing cost is lower, has very big application potential aspect the low pressure synchronous rectification.Because the characteristic of JFET, the general MOSFET that adopts makes the structure that rectifying tube and JFET make continued flow tube in circuit of synchronous rectification.With respect to the drive characteristic of MOSFET, the type of drive of depletion type JFET has a great difference.Depletion type JFET is in " often opening " state when the gate pole input voltage is zero, turn-off when applying certain negative pressure.Be the complete conducting of JFET that makes the N raceway groove, gate electrode drive signals will make the gate voltage of JFET keep about 0.7V and keep certain gate drive current.
Forward converter is the simplest isolated buck formula DC/DC converter, and the LC filter of its output is fit to the big electric current of output very much, can effectively suppress output voltage ripple.In all isolation DC/DC converters, forward converter becomes the first-selected topological structure of low-voltage and high-current power inverter.For realizing the application of N channel depletion type power JFET in the forward conversion circuit, the switch of good drive circuit control JFET must be arranged.All need good square-wave input signal source to realize but existing JFET drives, can't directly apply to the comparatively complicated JFET drive circuit of translation circuit.And these drive circuits also need auxiliary circuit or special driver to realize, all need special driver and power supply as the patent US 6741099 of Power-One and the patent US 6661276 of Lovoltech, 2608535 needs special purpose driver of the patent US of TI and negative supply.
Summary of the invention
Technical problem solved by the invention is, a kind of auxiliary circuit or special driver of not needing is provided, and also do not need the forward converter of extra accessory power supply.
For achieving the above object, the present invention adopts following technical scheme:
A kind of forward converter, comprise power supply, input control loop, transformer and current rectifying and wave filtering circuit, described input control loop comprises main switch, the former limit main winding of described transformer is connected between the drain electrode of anodal and described main switch of power supply, and the source electrode of described main switch and power cathode are with connecing input ground; Described current rectifying and wave filtering circuit comprises rectifying tube and N raceway groove JFET continued flow tube, the gate pole of described rectifying tube and the drain electrode of described continued flow tube connect the positive synonymous end of transformer secondary main winding, the drain electrode of described rectifying tube is connected with the other end of described transformer secondary main winding, and the source electrode of described continued flow tube and the source electrode of described rectifying tube are with connecing output ground;
It is characterized in that: described transformer has the secondary winding that is used to export drive control signal, is provided with the drive circuit that pulse drive signal is provided to described continued flow tube between the gate pole of itself and described continued flow tube.
Preferably, described drive circuit comprises charging circuit, discharge circuit and level coupling circuit; Described level coupling circuit has coupling resistance and the coupling inductance that is connected in parallel, the output of the described charging circuit of a termination of described level coupling circuit, the gate pole of the described continued flow tube of its another termination; Described charge and discharge circuit receives the signal of telecommunication from described secondary winding, selects a ground conducting or a shutoff under the control of described main switch, produces the drive signal of described continued flow tube.
Preferably, described transformer secondary winding comprises main winding and auxiliary winding, it is described that to be used to the transformer secondary winding of drive control signal is provided be described auxiliary winding, described charging circuit comprises second diode, described discharge circuit comprises triode, the positive synonymous end ground connection of described auxiliary winding, the anode of described second diode of another termination and the emitter of described triode, the base stage of described triode is by grounding through resistance, and the negative electrode of its collector electrode and described second diode connects the input of described level coupling circuit.
Can and connect auxiliary capacitor at described resistance two ends, the conducting of described triode is speeded up.
Can prevent the BE knot of the auxiliary described triode of winding voltage reverse breakdown of described transformer secondary at the emitter serial connection booster diode of described triode.
Also can adopt the 4th switching tube to constitute described charging circuit and described discharge circuit, the positive synonymous end ground connection of described auxiliary winding, the source electrode of described the 4th switching tube of another termination, the gate pole of described the 4th switching tube is by grounding through resistance, and its drain electrode connects the input of described level coupling circuit.
Preferably, described transformer secondary winding comprises main winding and auxiliary winding, it is described that to be used to the transformer secondary winding of drive control signal is provided be described auxiliary winding, described charging circuit comprises second diode, described discharge circuit comprises the 4th diode, the positive synonymous end ground connection of described auxiliary winding, its other end connects the anode of second diode and the negative electrode of the 4th diode, the negative electrode of described second diode of input termination of described level coupling circuit, the gate pole of the described continued flow tube of its output termination is connected with the anode of the 4th diode simultaneously.
Can between the output of described the 4th diode and level coupling circuit, be connected in series diode, so that the forward conduction voltage drop of described discharge circuit is higher than the conduction voltage drop of the gate pole of described continued flow tube to the source electrode PN junction.
Preferably, it is described that to be used to the transformer secondary winding of drive control signal is provided be transformer secondary main winding, described charging circuit comprises charging diode, described discharge circuit comprises switching tube, the grounded emitter of this switching tube, its base stage connects described transformer secondary main winding positive synonymous end by resistance, the anode of described charging diode connects the drain electrode and the negative end of the same name of described transformer secondary main winding of described rectifying tube, and the negative electrode of described charging diode and the collector electrode of described switching tube connect the input of described level coupling circuit.
Above-mentioned forward converter can adopt auxiliary winding reset forward circuit, it comprises the demagnetization winding and first diode that is connected in series between the input power positive cathode, the plus earth of described first diode, the positive synonymous end of the end negative of the same name of described demagnetization winding and the former limit of described transformer main winding are connected in the positive pole of input power supply.
Above-mentioned forward converter also can adopt the double tube positive exciting circuit, it comprises first diode, the 5th switching tube and the 3rd diode, the plus earth of described first diode, negative electrode connects the positive synonymous end of the former limit of described transformer main winding and the source electrode of described the 5th switching tube, described the 3rd diode anode connects the drain electrode of described main switch and the end negative of the same name of the former limit of transformer main winding, and negative electrode connects the positive pole of input power supply and the drain electrode of described the 5th switching tube.
Above-mentioned forward converter also can adopt active clamping circuir, it comprises clamp switch pipe and clamping capacitance, the source ground of described clamp switch pipe, drain electrode connects an end of described clamping capacitance, the end negative of the same name of the former limit of the described transformer of another termination main winding of described clamping capacitance and the drain electrode of described main switch.
Beneficial technical effects of the present invention is:
The present invention is provided with drive circuit in existing forward converter, charging circuit in this drive circuit and discharge circuit receive the signal of telecommunication from transformer secondary winding, wherein charging circuit conducting when main switch turn-offs provides high level signal by the level coupling circuit to the gate pole of described continued flow tube; Discharge circuit conducting when main switch is opened, the gate pole of continued flow tube obtains low level signal by the effect of discharge circuit.The break-make of JFET makes forward converter work in the synchronous rectification state by the voltage signal control of Transformer Winding.Control the break-make that is used as the N channel depletion type JFET of continued flow tube in the circuit of synchronous rectification owing to utilize the voltage signal of Transformer Winding, it is self-driven to realize that drive signal directly comes from Transformer Winding, therefore do not need special driver, also need not the power supply of other power supply even negative supply, simple and reliable.
When forward converter shuts down, coupling inductance in the level coupling circuit is discharged by coupling resistance, JFET gate pole level slowly is elevated to zero, and JFET keeps off state a period of time when converter turn-offs, so machine negative pressure can not appear closing in the output of converter.This can be avoided the inverter off negative pressure problem to a certain extent.
Description of drawings
Fig. 1 a adopts N channel depletion type JFET to make the basic circuit diagram of the auxiliary winding reset forward converter of continued flow tube.
Fig. 1 b is each power tube driving of converter among Fig. 1 a and the voltage timing waveform at Transformer Winding two ends.
Fig. 2 a is the auxiliary winding reset forward converter circuit diagram with drive circuit of first kind of citation form.
Fig. 2 b is that each power tube drives and the voltage timing waveform at Transformer Winding two ends among Fig. 2 a.
Fig. 3 is the forward converter circuit diagram of a kind of replacement scheme of Fig. 2 a illustrated embodiment.
Fig. 4 is the two-transistor forward converter circuit diagram with drive circuit of first kind of citation form.
Fig. 5 is the active clamp forward converter circuit figure with drive circuit of first kind of citation form.
Fig. 6 is the auxiliary winding reset forward converter circuit diagram with drive circuit of second kind of citation form.
Fig. 7 is the two-transistor forward converter circuit diagram with drive circuit of second kind of citation form.
Fig. 8 is the active clamp forward converter circuit figure with drive circuit of second kind of citation form.
Fig. 9 is the auxiliary winding reset forward converter circuit diagram with drive circuit of the third citation form.
Figure 10 is the forward converter circuit diagram of a kind of replacement scheme embodiment illustrated in fig. 9.
Figure 11 is the two-transistor forward converter circuit diagram with drive circuit of the third citation form.
Figure 12 is the active clamp forward converter circuit figure with drive circuit of the third citation form.
Embodiment
Below also the present invention is described in further detail in conjunction with the accompanying drawings by embodiment.
Fig. 1 a adopts N channel depletion type JFET to make the basic circuit diagram of the auxiliary winding reset forward converter of continued flow tube, and wherein continued flow tube Q3 needs certain drive signal to work.Fig. 1 b is each power tube driving of converter among Fig. 1 a and the voltage timing waveform at Transformer Winding two ends.The driving that realizes JFET with prior art needs good square-wave input signal source.
The JFET drive circuit of forward converter of the present invention comprises charging circuit, discharge circuit and level coupling circuit three parts.Drive circuit provides JFET the gate drive current of conduction period simultaneously.And according to the difference of topological structure, the drive circuit of JFET continued flow tube has three kinds of citation forms.
Embodiment one
Shown in Fig. 2 a, this forward converter has the drive circuit of first kind of citation form, and the input control loop adopts auxiliary winding reset forward circuit.
Wherein Q1 is a N-channel MOS FET main switch, and Q2 is a N-channel MOS FET rectifying tube, and Q3 is a N channel depletion type JEFET continued flow tube.V1 is the input power supply, and inductance C1 is used to import filtering, connects the end positive and negative of the same name of input power supply V1 respectively.The former secondary both sides of transformer TX1 have two windings respectively.Two windings on former limit are respectively former limit main winding and demagnetization winding.The different name end of positive synonymous end of former limit main winding (end that former limit main winding is connect positive source is called anode, and end mutually of the same name is a positive synonymous end, represents with stain among the figure) and demagnetization winding links together, and contact is received the positive synonymous end of input power supply V1.The other end of former limit winding is connected with the drain electrode of main switch Q1, and the source electrode of main switch Q1 connects input power supply ground, bears end of the same name with promptly importing power supply V1.The other end of demagnetization winding is connected with the negative electrode of the first diode D1, and the anode of the first diode D1 connects input ground.The secondary winding comprises secondary main winding and auxiliary winding.The positive synonymous end of secondary main winding connects an end, the drain electrode of continued flow tube Q3 and the gate pole of rectifying tube Q2 of output filter L1.The other end of output filter L1 connects the end of output loading R1 and output filter C2.The other end of load R1 and C2 is connected to output ground.The other end of secondary main winding connects the drain electrode of rectifying tube Q2.The source electrode of the source electrode of rectifying tube Q2 and continued flow tube Q3 is connected to output ground together.The positive synonymous end of the auxiliary winding of secondary side connects output ground.The other end of the auxiliary winding of secondary connects the anode of the second diode D2 and the emitter of triode Q4.The base stage of triode Q4 is connected to output ground by resistance R 2.Coupling resistance R3 and the coupling inductance C3 formation coupling circuit that is connected in parallel, an end connects the negative electrode of D2 and the collector electrode of Q4, and the other end is connected to the gate pole of continued flow tube Q3.
The forward converter operation principle of present embodiment is as follows: the drive control signal of continued flow tube Q3 comes from auxiliary winding.Open constantly at main switch Q1, the positive synonymous end polarity of Transformer Winding is being for just, rectifying tube Q2 conducting.This moment, the following terminal voltage of auxiliary winding was a negative value.Node A between triode Q4 and the coupling resistance R3 is because triode Q4 conducting becomes negative value.Turn-off constantly at main switch Q1, transformer positive synonymous end polarity is for negative, and to the charging of A point, this node remains constant positive voltage to auxiliary winding by the second diode D2.So the A point along with the break-make of main switch Q1, keeps good square-wave waveform, shown in Fig. 2 b.Because coupling inductance C3 and continued flow tube Q3 gate pole are to the existence of source electrode PN junction, it is the zero negative coupling level that arrives that the gate pole of continued flow tube Q3 has formed voltage magnitude, and ceiling voltage is 0.7V, the break-make of control continued flow tube Q3.Because the existence of coupling resistance R3, by the discharge of coupling inductance C3, continued flow tube Q3 keeps certain gate drive current.Because coupling inductance C3 and coupling resistance R3 are bigger, the A level point remains unchanged substantially.The signal shaping of transformer secondary winding or auxiliary winding can be become high level by above process is 0.7V, and low level is kept certain gate drive current in the JFET conducting phase simultaneously less than the pulse drive signal of-2V.
Simultaneously, in order to accelerate the conducting of triode Q4, resistance R 2 can and connect the electric capacity of a constant volume.The BE knot of reverse breakdown triode Q4 can be protected at diode of emitter junction serial connection of triode Q4 when preventing that auxiliary winding voltage is higher.
As shown in Figure 3, triode Q4 and diode D2 can be replaced with a N-channel MOS FET pipe Q41, as a kind of replacement scheme that is present embodiment.The 4th switching tube Q41 has constituted the charging in the drive circuit, discharge circuit part, the positive synonymous end ground connection of the auxiliary winding of transformer secondary, the source electrode of described the 4th switching tube Q41 of another termination, the gate pole of Q41 is by resistance R 2 ground connection, and its drain electrode connects the input of described level coupling circuit.
Figure 4 shows that the present invention has the popularization of the drive circuit of first kind of citation form at the double tube positive exciting circuit, the difference of itself and embodiment one is that the input control loop of converter partly adopts the double tube positive exciting circuit.It comprises the first diode D1, the 5th switching tube Q5 and the 3rd diode D3, the plus earth of the first diode D1, negative electrode connects the positive synonymous end of the former limit of transformer main winding and the source electrode of the 5th switching tube Q5, the 3rd diode D3 anode connects the drain electrode of main switch Q1 and the other end of the former limit of transformer main winding, and the negative electrode of D3 connects the positive pole of input power supply V1 and the drain electrode of the 5th switching tube Q5.
Figure 5 shows that the present invention has the popularization of the drive circuit of first kind of citation form at active clamping circuir, the difference of itself and embodiment one is that the input control loop of converter partly adopts active clamping circuir.It comprises clamp switch pipe Q6 and clamping capacitance C4, the source ground of clamp switch pipe Q6, and drain electrode connects the end of clamp electricity C4, the different name end of another former limit of termination transformer main winding of clamping capacitance C4 and the drain electrode of main switch Q1.
It more than is forward converter with JEFET continued flow tube drive circuit of first kind of citation form, be characterized in: charging circuit and discharge circuit are in state in parallel, by same winding same node is discharged and recharged, level coupling circuit by the RC parallel connection carries out level conversion to this node then, forms gate electrode drive signals.
Embodiment two
As shown in Figure 6, this forward converter has the drive circuit of second kind of citation form, and the input control loop adopts auxiliary winding reset forward circuit.Except that driving circuit section, the forward converter of this embodiment is identical with the forward converter remainder structure of embodiment one.
Charging circuit in this forward converter drive circuit partly comprises the second diode D2, discharge circuit comprises the 4th diode D4 and the 5th diode D5, the positive synonymous end ground connection of the auxiliary winding of transformer secondary, its other end connects the anode of the second diode D2 and the negative electrode of the 4th diode D4, the negative electrode of the input termination second diode D2 of level coupling circuit, output connects the gate pole of continued flow tube Q3, is connected with the anode of the 5th diode D5 simultaneously.
In the present embodiment, the drive control signal of continued flow tube Q3 also is to come from the auxiliary winding of transformer secondary, but operation principle is slightly different with the drive circuit of first kind of citation form.Main switch Q1 connects the winding terminal polarity of the 4th diode D4 for negative when opening, the auxiliary winding of secondary is by the 4th diode D4, the 5th diode D5 gate pole discharge to continued flow tube Q3, Q3 gate pole level is for negative, while is owing to the coupling of inductance C3, the rapid step-down of node level between the second diode D2 and the inductance C3; Main switch Q1 connects the second diode D2 winding terminal when turn-offing polarity is for just, and the auxiliary winding of secondary charges to the node between D2 and the inductance C3 by the second diode D2, and owing to the coupling of inductance C3, continued flow tube Q3 gate voltage raises rapidly.So continued flow tube Q3 gate pole has formed the square-wave signal of 0.7V to negative voltage.Serial connection the 5th diode D5 forms discharge path when can prevent main switch Q1 blocking interval Transformer Winding voltage zero-cross on the 4th diode D4 branch road.The quantity of institute's series diode can be adjusted according to actual needs, only needs the forward conduction voltage drop of series arm to be higher than continued flow tube Q3 gate pole the conduction voltage drop of source electrode PN junction is got final product.
Figure 7 shows that the present invention has the popularization of the drive circuit of second kind of citation form at the double tube positive exciting circuit, the difference of itself and embodiment two is that the input control loop of converter partly adopts the double tube positive exciting circuit topological structure.
Figure 8 shows that the present invention has the popularization of the drive circuit of second kind of citation form at active clamping circuir, the difference of itself and embodiment two is that the input control loop of converter partly adopts the active clamping circuir topological structure.
It more than is forward converter with JEFET continued flow tube drive circuit of second kind of citation form, the characteristics of second kind of citation form and first kind are different, it is discharged and recharged by same winding, but charging circuit connects the level coupling circuit of RC parallel connection, and discharge circuit directly connects JFET gate pole and level coupling circuit.
Embodiment three
As shown in Figure 9, this forward converter has the drive circuit of the third citation form, and the input control loop adopts auxiliary winding reset forward circuit.Except that driving circuit section, the forward converter of this embodiment is identical with the forward converter remainder structure of embodiment one, two.
Different from the auxiliary winding of transformer secondary with drive control signal among the embodiment one, two, the drive control signal of this enforcement is from transformer secondary main winding.In the drive circuit, charging circuit comprises charging diode D2a, discharge circuit comprises switch triode Q4a, the grounded emitter of this switch triode Q4a, its base stage connects described transformer secondary main winding positive synonymous end by resistance R 2a, the anode of charging diode D2a connects the drain electrode and the transformer secondary main winding other end of rectifying tube Q2, and the contact of the collector electrode of the negative electrode of charging diode D2a and switch triode Q4a is connected to the input of level coupling circuit.
In the present embodiment, the drive control signal of continued flow tube Q3 comes from the transformer secondary, and the drive circuit of operation principle and first kind of citation form is roughly the same.Secondary winding positive synonymous end discharged the node between Q4a and the coupling resistance R3 by the conducting of switch triode Q4a over the ground when main switch Q1 opened; The secondary winding charged to the node between triode Q4a and the resistance R 3 by charging diode D2a when main switch Q1 turn-offed.Node has formed zero square-wave signal to positive voltage between triode Q4a and the resistance R 3.Because it is zero to negative bootstrapping level that the coupling of inductance C3, continued flow tube Q3 gate pole have formed voltage magnitude.
As shown in figure 10, the switching tube Q4a in the present embodiment can be replaced with N-channel MOS FET pipe Q4a1 by the NPN triode.
Figure 11 shows that the present invention has the popularization of the drive circuit of the third citation form at the double tube positive exciting circuit, the difference of itself and embodiment three is that the input control loop of converter partly adopts the double tube positive exciting circuit topological structure.
Figure 12 shows that the present invention has the popularization of the drive circuit of the third citation form at active clamping circuir, the difference of itself and embodiment three is that the input control loop of converter partly adopts the active clamping circuir topological structure.
It more than is forward converter with JEFET continued flow tube drive circuit of the third citation form.The characteristics of the third citation form are: charging circuit and discharge circuit discharge and recharge same node, and the level coupling circuit by the RC parallel connection carries out level conversion then, form gate electrode drive signals.But charging circuit and discharge circuit are not in state in parallel, and charging circuit connects the secondary winding, and discharge circuit ground connection is discharged over the ground.
In above-mentioned each embodiment of the present invention, when inverter off, continued flow tube Q3 gate pole level is a negative value, and coupling inductance C3 discharges by coupling resistance R3, and continued flow tube Q3 gate pole level slowly is elevated to zero.So continued flow tube Q3 keeps off state a period of time when converter turn-offs, machine negative pressure can not appear closing in the output of converter.
Because the manufacturing process of JFET has determined JFET itself not have body diode, but can add a Schottky diode in inside during fabrication.JFET in above-mentioned each circuit all refers to be with schottky diode device, if add diode in not having, then need be between the DS of the JFET utmost point anti-and Schottky diode.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (12)
1. forward converter, comprise power supply (V1), the input control loop, transformer (TX1) and current rectifying and wave filtering circuit, described input control loop comprises main switch (Q1), the former limit main winding of described transformer is connected between the drain electrode of the positive pole of power supply (V1) and described main switch (Q1), the source electrode of described main switch (Q1) and power cathode are with connecing input ground: described current rectifying and wave filtering circuit comprises rectifying tube (Q2) and N raceway groove JFET continued flow tube (Q3), the drain electrode of the gate pole of described rectifying tube (Q2) and described continued flow tube (Q3) connects the positive synonymous end of transformer secondary main winding, the drain electrode of described rectifying tube (Q2) is connected with the other end of described transformer secondary main winding, and the source electrode of the source electrode of described continued flow tube (Q3) and described rectifying tube (Q2) is with connecing output ground;
It is characterized in that: described transformer has the secondary winding that is used to export drive control signal, is provided with the drive circuit that pulse drive signal is provided to described continued flow tube (Q3) between the gate pole of itself and described continued flow tube (Q3).
2. forward converter as claimed in claim 1 is characterized in that, described drive circuit comprises charging circuit, discharge circuit and level coupling circuit; Described level coupling circuit has coupling resistance (R3) and the coupling inductance (C3) that is connected in parallel, the output of the described charging circuit of a termination of described level coupling circuit, the gate pole of the described continued flow tube of its another termination (Q3); Described charge and discharge circuit receives the signal of telecommunication from described secondary winding, selects a ground conducting or a shutoff under the control of described main switch (Q1), produces the drive signal of described continued flow tube (Q3).
3. forward converter as claimed in claim 2, its feature is born in, described transformer secondary winding comprises main winding and auxiliary winding, it is described that to be used to the transformer secondary winding of drive control signal is provided be described auxiliary winding, described charging circuit comprises second diode (D2), described discharge circuit comprises triode (Q4), the positive synonymous end ground connection of described auxiliary winding, the emitter of the anode of described second diode of another termination (D2) and described triode (Q4), the base stage of described triode (Q4) is by resistance (R2) ground connection, and the negative electrode of its collector electrode and described second diode (D2) connects the input of described level coupling circuit.
4. forward converter as claimed in claim 3 is characterized in that, at described resistance (R2) two ends and be connected to auxiliary capacitor.
5. forward converter as claimed in claim 3 is characterized in that, is serially connected with booster diode at the emitter of described triode (Q4).
6. forward converter as claimed in claim 2, it is characterized in that, described transformer secondary winding comprises main winding and auxiliary winding, it is described that to be used to the transformer secondary winding of drive control signal is provided be described auxiliary winding, described charging circuit and described discharge circuit comprise the 4th switching tube (Q41), the positive synonymous end ground connection of described auxiliary winding, the source electrode of described the 4th switching tube of another termination (Q41), the gate pole of described the 4th switching tube (Q41) is by resistance (R2) ground connection, and its drain electrode connects the input of described level coupling circuit.
7. forward converter as claimed in claim 2, it is characterized in that, described transformer secondary winding comprises main winding and auxiliary winding, it is described that to be used to the transformer secondary winding of drive control signal is provided be described auxiliary winding, described charging circuit comprises second diode (D2), described discharge circuit comprises the 4th diode (D4), the positive synonymous end ground connection of described auxiliary winding, its other end connects the anode of second diode (D2) and the negative electrode of the 4th diode (D4), the negative electrode of described second diode of the input termination of described level coupling circuit (D2), the gate pole of its output described continued flow tube of termination (Q3) is connected with the anode of the 4th diode (D4) simultaneously.
8. forward converter as claimed in claim 7 is characterized in that, is connected in series at least one diode (D5) between the output of described the 4th diode (D4) and described level coupling circuit.
9. forward converter as claimed in claim 2, it is characterized in that, it is described that to be used to the transformer secondary winding of drive control signal is provided be transformer secondary main winding, described charging circuit comprises charging diode (D2a), described discharge circuit comprises switching tube (Q4a), the grounded emitter of this switching tube (Q4a), its base stage connects described transformer secondary main winding positive synonymous end by resistance (R2a), the anode of described charging diode (D2a) connects the drain electrode and the negative end of the same name of described transformer secondary main winding of described rectifying tube (Q2), and the collector electrode of the negative electrode of described charging diode (D2a) and described switching tube (Q4a) connects the input of described level coupling circuit.
10. as the described forward converter of claim 1～9, it is characterized in that, described forward converter adopts auxiliary winding reset circuit, it comprises demagnetization winding and first diode (D1) that is connected in series between input power supply (V1) both positive and negative polarity, the plus earth of described first diode (D1), the positive synonymous end of the end negative of the same name of described demagnetization winding and the former limit of described transformer main winding are connected in the positive pole of input power supply (V1).
11. as the described forward converter of claim 1～9, it is characterized in that, described forward converter adopts the double tube positive exciting circuit, it comprises first diode (D1), the 5th switching tube (Q5) and the 3rd diode (D3), the plus earth of described first diode (D1), negative electrode connects the positive synonymous end of the former limit of described transformer main winding and the source electrode of described the 5th switching tube (Q5), described the 3rd diode (D3) anode connects the drain electrode of described main switch (Q1) and the end negative of the same name of the former limit of transformer main winding, and negative electrode connects the positive pole of input power supply (V1) and the drain electrode of described the 5th switching tube (Q5).
12. as the described forward converter of claim 1～9, it is characterized in that, described forward converter adopts active clamping circuir, it comprises clamp switch pipe (Q6) and clamping capacitance (C4), the source ground of described clamp switch pipe (Q6), drain electrode connects an end of described clamping capacitance (C4), the end negative of the same name of the former limit of the described transformer of another termination main winding of described clamping capacitance (C4) and the drain electrode of described main switch (Q1).
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| CN2007100018664A CN101237189B (en) | 2007-01-31 | 2007-01-31 | Positive activation converter |
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| CN2007100018664A CN101237189B (en) | 2007-01-31 | 2007-01-31 | Positive activation converter |
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| CN101237189B CN101237189B (en) | 2011-10-26 |
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