CN205377643U - Isolating drive circuit - Google Patents
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- CN205377643U CN205377643U CN201520984787.XU CN201520984787U CN205377643U CN 205377643 U CN205377643 U CN 205377643U CN 201520984787 U CN201520984787 U CN 201520984787U CN 205377643 U CN205377643 U CN 205377643U
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Abstract
The utility model provides a do not receive the influence of former limit duty cycle size and the novel isolating drive circuit of driving energy reinforce. The utility model discloses a former limit blocking capacitance in the circuit that stimulates magnetism is removed to the thinking, and former limit degausser is only participated in constituting by this electric capacity. Stimulate magnetism the circuit and comprise former limit PWM control signal, former polygonal voltage source, isolation transformer primary side winding, former limit switch tube in former limit, when former limit PWM control signal is the high level, it switches on to drive former limit switch tube, switch tube on -state voltage amplitude is ignored, the voltage at former polygonal voltage source both ends directly adds at the isolation transformer primary side winding both ends, through transformer coupling to vice limit rectifier circuit, output is vice limit drive signal after vice limit rectifier circuit rectification, it is former as isolation transformer, the vice limit turn ratio is at 1 o'clock, this drive signal's high level amplitude equals the voltage amplitude at former polygonal voltage source both ends, it is irrelevant with the duty cycle size of former limit PWM signal.
Description
Technical field
This utility model relates to circuit field, concrete, relates to a kind of for, in switch power supply system, driving the drive circuit of switching device, it is provided that isolation, the device controlled.
Background technology
In recent years, energy problem is increasingly serious, and the new forms of energy such as photovoltaic solar, wind-power electricity generation obtain national policy and support energetically, and the sector quickly grows.Photovoltaic auxiliary power supply is a kind of switch converters, for providing stable, reliable DC voltage for photovoltaic solar, wind-power electricity generation, SVG dispatch control system.
Affected by application scenario, photo-voltaic power supply operating voltage range is very wide, for photovoltaic solar electric station, by illumination intensity effect, the output voltage of photovoltaic solar electric station tens volts on kilovolt, corresponding auxiliary electric power supply operating voltage range also tens volts on kilovolt.The available technology of photovoltaic auxiliary power supply includes the scheme such as double-transistor flyback, double tube positive exciting, similar with full-bridge, half-bridge converter, double-transistor flyback, double tube positive exciting circuit need isolated drive circuit to drive, control switching tube, because of operating voltage range width, the change in duty cycle scope of its correspondence is relatively big, and isolated drive circuit is difficult to design.
Existing conventional isolated drive circuit, different from the power circuit of normal shock topology are in that, normal shock topology circuit is for the transmission of power.And the driving that isolated drive circuit only realizes power switch pipe in topology (such as metal-oxide-semiconductor, IGBT etc.) controls, it is mainly used in output control signal to power switch pipe.
Fig. 1 a is existing conventional isolated drive circuit, Fig. 1 b is isolated drive circuit application example figure in forward converter, a kind of isolated drive circuit, for driving the power switch pipe in switch power supply system, including primary circuit and secondary side rectification circuit, wherein, primary circuit includes PWM controller, the switch transistor T R1 controlled by PWM controller, TR2, resistance R1, the primary side winding Np0 and electric capacity C1 of transformator, secondary side rectification circuit includes the vice-side winding Ns0 and resistance R2 of transformator, the Same Name of Ends of the vice-side winding Ns0 of transformator draws the output terminals A as isolated drive circuit through resistance R2, for being connected with the grid of power switch pipe Q01；The different name end of the vice-side winding Ns0 of transformator draws the outfan B as isolated drive circuit, for being connected with the source electrode of power switch pipe Q01.The i.e. grid source electrode of power switch pipe Q01 in isolation drive output port A, B map interlinking 1b in Fig. 1 a, the isolated drive circuit shown in Fig. 1 a is only a modular circuit in Circuits System shown in Fig. 1 b.
The control signal that in Fig. 1 a, PWM (pulse-width signal) exports for control circuit, N-type audion TR1, P type audion TR2 forms totem pole to promote the driving force of pwm signal, VCC is totem pole direct current supply voltage, resistance R1 is former margin leakage resistance, C1 is that former limit is every directly driving electric capacity, T1 is the isolating transformer turn ratio to be 1, R2 be secondary current-limiting resistance, A, B are that secondary drives signal output port, and VAB represents port AB both end voltage amplitude.The open defect that this circuit exists is: the high level amplitude of secondary isolation drive signal is affected by the dutycycle of former limit signal, and pwm signal dutycycle is more big, and secondary drives signal high level amplitude more low, and secondary-side switch pipe faces the risk that can not drive；When pwm signal dutycycle is less, secondary drives signal high level amplitude more high, and secondary-side switch pipe driving stage faces forward breakdown risk.
In conjunction with interdependent node voltage waveform shown in Fig. 2, the work process of summary Fig. 1 a circuit.In Fig. 2, setting driving signal dutyfactor as D, high level amplitude is designated as Vpwm, VCC voltage and is designated as V0, and capacitance C1 both end voltage is designated as Vc0, and polarity is left positive right negative.When being high level when driving signal, TR1 turns on, TR2 turns off, isolating transformer primary side winding Np0 both end voltage is designated as Vp0, then Vp0=V0-Vc0, and the excitatory voltagesecond product at these stage primary side winding two ends is Vp0*D, it can thus be appreciated that, in the excitatory process of transformator, transformator is by the impact of dutycycle, and the amplitude of its primary side winding Np0 both end voltage is compared with the amplitude V0 lower than original edge voltage VCC；The amplitude of the port voltage VAB of secondary port A, B of the output of vice-side winding Ns0 end is relatively low in the amplitude V0 of original edge voltage VCC.And when driving signal is low level, TR2 turns on, TR1 turns off, the voltage at isolating transformer primary side winding two ends is the voltage at capacitance C1 two ends, Vp0=Vc0, the degaussing voltagesecond product at these stage primary side winding two ends is Vp0* (1-D), it can thus be appreciated that, in the demagnetization process of transformator, transformator is subject to electric capacity in the impact of excitatory stage energy storage, via in the degausser that resistance, electric capacity are formed, remanent magnetism energy that the backward energy putting on transformator includes in transformator and the energy storage of electric capacity C1.Can be obtained by voltage-second balance: Vp0*D=Vp0* (1-D), the voltage Vc0=V0*D that pwm signal is high level stage capacitance C1 two ends can be calculated by this formula, the high level amplitude at primary side winding two ends is V0* (1-D), therefore, can obtaining pwm signal dutycycle more big, secondary drives signal high level amplitude more low.For ensureing that secondary drives signal amplitude can reach the threshold value thresholding of switching tube to be driven, the dutycycle of former limit pwm signal is generally below 50%.
Patent publication No. is that CN101621246A discloses a kind of magnetic isolation drive circuit, this circuit is it can be avoided that the misoperation of loop of power circuit master switch, power supply is prevented therefore to lose efficacy, but the program adopts tertiary winding shortcoming obvious: 1) winding increases and can cause that the leakage inductance between former and deputy limit increases, and can cause higher driving switch spike；2) program design complexity, cost is high.
For the distinct disadvantage that foregoing circuit exists, isolated drive circuit is analysed in depth by inventor, and this case thus produces.
Utility model content
In view of this, in order to solve above-mentioned technical problem, this utility model provides a kind of not by the novel isolated drive circuit that the impact of former limit dutycycle size and driving force are strong.
Due in existing isolated drive circuit, capacitance both participates in constituting former limit exciting circuit, participate in again constituting degausser, due to capacitance series connection dividing potential drop, the steady state voltage at its two ends is equal to the voltage magnitude at two ends, original edge voltage source and the product of former limit PWM control signal duty cycle, and this steady state voltage is affected by the dutycycle size of former limit PWM；Corresponding, it is delivered to the high level amplitude of secondary side rectification circuit through isolating transformer and deducts the steady state voltage value at capacitance two ends equal to the voltage at two ends, original edge voltage source, equally, the high level amplitude of secondary driving signal is affected by the dutycycle size of former limit pwm signal.
Thinking of the present utility model is to remove the capacitance in the exciting circuit of former limit, and this electric capacity is only involved in constituting former limit degausser.Former limit exciting circuit is made up of former limit pwm control signal, original edge voltage source, isolating transformer primary side winding, primary side switch pipe；When former limit pwm control signal is high level, drive the conducting of primary side switch pipe, switching tube conducting voltage amplitude is ignored, the voltage at two ends, original edge voltage source is applied directly to isolating transformer primary side winding two ends, by transformer coupled to secondary side rectification circuit, after secondary side rectification circuit rectification, it is output as secondary drives signal, when the isolating transformer former and deputy limit turn ratio is 1, the high level amplitude of this driving signal is equal to the voltage magnitude at two ends, original edge voltage source, unrelated with the dutycycle size of former limit pwm signal.
Thinking accordingly, this utility model provides a kind of isolated drive circuit, for driving the power switch pipe in switch power supply system, including primary circuit and secondary side rectification circuit, described primary circuit includes PWM controller, PWM controller the N type switch tube Q1 controlled, the primary side winding of transformator and electric capacity, described secondary side rectification circuit includes vice-side winding and the diode D2 of transformator, the Same Name of Ends of the vice-side winding of described transformator draws the first outfan as isolated drive circuit through diode D2, for being connected with the grid of power switch pipe；The different name end of the vice-side winding of described transformator draws the second outfan as isolated drive circuit, it is connected for the source electrode with power switch pipe, described isolated drive circuit, in the exciting circuit of primary side winding and degausser of transformator, electric capacity only operates in degausser, is not involved in excitatory.
Preferably, described primary circuit, also include resistance R3 and diode D1, wherein, the Same Name of Ends of transformator draws the input as isolated drive circuit, for being connected with voltage source；The different name end of transformator passes through N type switch tube Q1 ground connection；One end of electric capacity is connected with the Same Name of Ends of transformator, and the other end of electric capacity is connected with the negative electrode of diode, and the anode of diode is connected with the different name end of transformator；Resistor coupled in parallel is at the two ends of electric capacity；Wherein, the exciting circuit of the primary side winding of transformator, only it is made up of the conduction path of N type switch tube Q1 and primary side winding；The degausser of the primary side winding of transformator, when N type switch tube Q1 turns off, is made up of electric capacity, resistance, diode and primary side winding.
Preferably, described primary circuit, also include resistance R3 and diode D1, wherein, the Same Name of Ends of transformator draws the input as isolated drive circuit, for being connected with voltage source；The different name end of transformator passes through N type switch tube Q1 ground connection；The anode of diode is connected with the different name end of transformator, and the negative electrode of diode is connected with one end of electric capacity, the other end ground connection of electric capacity；Resistor coupled in parallel is at the two ends of electric capacity；Wherein, the exciting circuit of the primary side winding of transformator, only it is made up of the conduction path of N type switch tube Q1 and primary side winding；The degausser of the primary side winding of transformator, when N type switch tube Q1 turns off, is made up of primary side winding and diode, electric capacity, resistance.
Preferably, described secondary side rectification circuit, also include accelerating breaking circuit, described acceleration breaking circuit is made up of resistance R5, resistance R6, resistance R7, P type switching tube Q2, wherein, one end of resistance R5 is connected to the anode of diode D2, and the other end of resistance R5 is connected to P type switching tube Q2 grid；One end of resistance R6 is connected to the negative electrode of diode D2, and the other end is connected to P type switching tube Q2 source electrode, and one end of resistance R7 connects P type switching tube Q2 drain electrode, and the other end is connected to transformator T1 vice-side winding Ns1 different name end.
Preferably, described N type switch tube Q1 is NPN type triode or N-type field effect transistor；Described P type switching tube Q2 is PNP type triode or P type field effect transistor.
The former limit degausser of this programme is the excitatory energy degaussing of isolating transformer, it is prevented that isolating transformer is saturated, improves the reliability of this utility model scheme.
Compared with prior art, this utility model has the advantages that
1) being transferred to the driving signal high level amplitude of secondary through isolating transformer and keep invariable within the scope of whole change in duty cycle, not by the impact of former limit dutycycle size, driving force is strong；
2) duty cycle scope of the present utility model is wider, can be even higher more than 50%；
3) this programme reliability is high, it is possible to effectively prevent the pwm signal abrupt transients moment that control circuit sends, and loop of power circuit is logical because drive circuit false triggering signal opens by mistake and loses efficacy；
4) this utility model circuit is simple, and cost is low, it is easy to design, and reliability is high.
Accompanying drawing explanation
Fig. 1 a is existing isolated drive circuit schematic diagram；
Fig. 1 b is isolated drive circuit application example figure in forward converter；
Fig. 2 is existing isolated drive circuit operation principle, associated loop voltage waveform；
Fig. 3 is the circuit theory diagrams of this utility model embodiment one；
Fig. 4 is this utility model embodiment one operation principle, associated loop voltage waveform；
Fig. 5 is one of this utility model embodiment two circuit theory diagrams；
Fig. 6 is the two of this utility model embodiment two circuit theory diagrams；
Fig. 7 is the three of this utility model embodiment two circuit theory diagrams；
Fig. 8 is this utility model embodiment three-circuit schematic diagram；
Fig. 9 is one of this utility model embodiment four circuit theory diagrams；
Figure 10 is the two of this utility model embodiment four circuit theory diagrams；
Figure 11 is the three of this utility model embodiment four circuit theory diagrams.
Detailed description of the invention
First embodiment
Fig. 3 illustrates this utility model first embodiment theory diagram, a kind of novel isolated drive circuit, including: include former limit pwm control signal, set its dutycycle as D, high level amplitude is designated as Vpwm, voltage source Vsource, sets its DC voltage value as VDD, former limit exciting circuit, former limit degausser, isolating transformer T1, it is assumed that it is former, the negative side turn ratio is 1, secondary side rectification circuit, acceleration breaking circuit.
Former limit exciting circuit is by voltage source Vsource, N type switch tube Q2, resistance R3, transformator T1 primary side winding Np1, PWM drive control signal, and wherein, PWM drives signal through resistance R3 input to switching tube Q2 grid through resistance；The positive pole of voltage source Vsource (Vsource mark in Fig. 3 "+" one end), it is connected to transformator T1 primary side winding Np1 Same Name of Ends (in Fig. 3 winding NP1 that one end with stain), transformator T1 primary side winding Np1 different name end (in Fig. 3, winding NP1 is without that one end of stain) is connected to switching tube Q2 drain electrode, switching tube Q2 source electrode is connected with the negative pole (in Fig. 3, Vsource marks one end of "-") of voltage source Vsource, and this common node is as ground, former limit.
Former limit degausser is made up of diode D1, resistance R4, electric capacity C2, and wherein, diode D1 anode is connected to transformator T1 primary side winding Np1 different name end；After electric capacity C2, resistance R4 are in parallel, one end is connected to the positive pole of voltage source Vsource, and the other end is connected to diode D1 negative electrode.
Secondary side rectification circuit is by transformator T1 vice-side winding Ns1, diode D2, port label C, D form, wherein transformator T1 vice-side winding Ns1 Same Name of Ends (in Fig. 3 winding Ns1 that one end with stain) is connected with diode D2 anode, transformator T1 vice-side winding Ns1 different name end (in Fig. 3, winding Ns1 is without that one end of stain) is connected to port D, and diode D2 negative electrode is connected to port label C.
Accelerating breaking circuit by resistance R5, R6, R7, P type switching tube Q2 forms, and wherein, one end of resistance R5 is connected to the anode of diode D2, and the other end of resistance R5 is connected to P type switching tube Q2 grid；One end of resistance R6 is connected to the negative electrode of diode D2, the other end is connected to P type switching tube Q2 source electrode, one end of resistance R7 connects P type switching tube Q2 drain electrode, and the other end is connected to transformator T1 vice-side winding Ns1 different name end (in Fig. 3, winding Ns1 is without that one end of stain).
Especially, adding the reason accelerating breaking circuit is: pwm signal is become low level moment from high level, the drain-source voltage across poles of switching tube Q1 has a process being gradually increasing, the forward bias voltage of back clamping diode D1 can not be set up immediately, therefore isolating transformer primary side winding both end voltage can not be anti-phase immediately at driving signal shutdown moment, cause that the trailing edge time that the driving signal that secondary port C, D export turns off is oversize, and then cause drive signal waveform distortion.
Add having the beneficial effect that of breaking circuit of acceleration and dropped to the low level stage at former limit pwm signal by high level, accelerating secondary port C, D drives signal to be reduced to low level decrease speed by high level, shorten and drive the signal trailing edge time, further, the turn-off power loss driving secondary port C, D corresponding is reduced.
The annexation of circuit shown in Figure 3, in conjunction with Fig. 4 circuit interdependent node voltage, current waveform, tells about operation principle:
T0～T1 stage: T0 moment, pwm signal is high level, switching tube Q1 turns on, diode D1 reversely ends, transformator T1 primary side winding Np1 Same Name of Ends voltage is just, different name terminal voltage is negative, and primary side winding Np1 both end voltage is voltage source Vsource both end voltage (between switching tube Q1 drain-source pole, conduction voltage drop is ignored), being designated as Vp1, amplitude is VDD；Because of transformator Same Name of Ends coupled relation, transformator T1 vice-side winding Ns1 Same Name of Ends voltage is just, different name terminal voltage is negative, and vice-side winding Ns1 both end voltage is equal to voltage source Vsource both end voltage (between switching tube Q1 drain-source pole, conduction voltage drop is ignored), and amplitude is VDD；
It is be distinctive in that maximum with existing isolated drive circuit herein, in this excitatory stage, DC bias supplies output voltage is applied directly to primary side winding two ends, and now capacitance C2 does not form path because of the reverse-biased of diode, primary voltage of transformer is made to be coupled to secondary in double amplitude mode, therefore, transformer primary, vice-side winding two ends voltage be to consistently equal to DC bias supplies output voltage, unrelated with the dutycycle size of pwm signal.
Further, port C, D both end voltage is designated as VCD, as shown in Figure 4.When diode D2 forward conduction, port C, D both end voltage is high level, and amplitude is VDD (ignoring the forward conduction voltage drop of diode D2), this stage, port C, D always remain as high level state and its amplitude is always VDD, unrelated with pwm signal dutycycle size.
T1～T2 stage: T1 moment pwm signal drops to low level, switching tube Q1 turns off, transformator T1 primary side winding Np1 Same Name of Ends voltage is negative, different name terminal voltage is just, diode D1 forward conduction, primary side winding Np1 both end voltage is electric capacity C2 both end voltage, is designated as Vc2, as shown in Figure 4, transformer primary side winding Np1 starts degaussing at excitatory energy on last stage.
In the degaussing stage, in the work process of scheme shown in Fig. 1 a, transformer primary side inductance exciting current elder generation forward inversely increases after being decreased to zero again, and reverse current amplitude is relevant with the dutycycle of the capacity of electric capacity C1, isolating transformer primary side winding inductance value, direct voltage source and pwm signal.The operation principle of this programme circuit and circuit as shown in Figure 1a this stage operation principle is significantly different is in that: switching tube Q1 shutdown moment, exciting current in this programme is gradually lowered from forward maximum, open moment to switching tube Q1 next time, this electric current can more than or equal to zero, part magnetization energy is consumed by resistance R4, without the inverse-exciting electric current provided by electric capacity C2, only have freewheeling path, path as shown in phantom in Figure 3.
At switching tube Q1 shutdown moment, because of transformator Same Name of Ends relation, transformer secondary winding Ns1 Same Name of Ends is negative, different name terminal voltage is negative, P type switching tube Q2 gate-source voltage is negative, and switching tube Q2 turns on, and resistance R6, R7 are used for accelerating port C, D both end voltage decrease speed, in whole T1～T2 stage, port C, D always remain as low level state.
Pwm signal low and high level state exports driving port C, D by isolated drive circuit as shown in Figure 3 through two stages of T0～T1 and T1～T2, and the high and low level state of port C, D all keeps consistent with pwm signal at any time.
Second embodiment
In first embodiment, former limit exciting circuit N type switch tube shown in Fig. 3 can also be NPN type triode, the P type switching tube that secondary accelerates in breaking circuit can also be PNP type triode, the permutation and combination of the two is such as shown in Fig. 5, Fig. 6, Fig. 7, after adjustment, the operation principle of circuit is the same with first embodiment, it may be achieved equivalent efficacy.
3rd embodiment
Fig. 8 illustrates this utility model the 3rd embodiment theory diagram, a kind of novel isolated drive circuit, including: former limit pwm control signal, former limit exciting circuit, former limit degausser, isolating transformer T1, secondary side rectification circuit, acceleration breaking circuit, only former limit degausser part is different from first embodiment for the present embodiment component annexation, other parts are completely the same, and the present embodiment former limit degausser annexation is:
Former limit degausser is made up of diode D1, resistance R4, electric capacity C2, and wherein, diode D1 anode is connected to transformator T1 primary side winding Np1 different name end (winding N in Fig. 8P1That one end without stain)；Electric capacity C2, resistance R4 be in parallel after one end be connected to voltage source Vsource negative pole (in Fig. 8 Vsource mark "-" one end), the other end is connected to diode D1 negative electrode.
After adjustment, the operation principle of circuit is essentially identical with first embodiment, difference is only in the degaussing stage: diode D1 forward conduction, primary side winding Np1 both end voltage deducts the difference of direct voltage source Vsource both end voltage equal to electric capacity C2 both end voltage, and its degaussing path is as shown in phantom in Figure 8.Circuit after adjustment is essentially identical with effect of first embodiment.
4th embodiment
In 3rd embodiment, former limit exciting circuit N type switch tube shown in Fig. 8 can also be NPN type triode, the P type switching tube that secondary accelerates in breaking circuit can also be PNP type triode, the permutation and combination of the two is such as shown in Fig. 9, Figure 10, Figure 11, after adjustment, the operation principle of circuit is the same with the 3rd embodiment, it may be achieved same or analogous effect.
Below it is only preferred implementation of the present utility model; it should be noted that; above-mentioned preferred implementation is not construed as restriction of the present utility model; for those skilled in the art; without departing from spirit and scope of the present utility model, it is also possible to making some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model; here no longer repeating by embodiment, protection domain of the present utility model should be as the criterion with claim limited range.
Claims (6)
1. an isolated drive circuit, for driving the power switch pipe in switch power supply system, including primary circuit and secondary side rectification circuit, described primary circuit includes PWM controller, PWM controller the N type switch tube Q1 controlled, the primary side winding of transformator and electric capacity, described secondary side rectification circuit includes vice-side winding and the diode D2 of transformator, the Same Name of Ends of the vice-side winding of described transformator draws the first outfan as isolated drive circuit through diode D2, for being connected with the grid of power switch pipe；The different name end of the vice-side winding of described transformator draws the second outfan as isolated drive circuit, for being connected with the source electrode of power switch pipe, it is characterised in that:
Described isolated drive circuit, in the exciting circuit of primary side winding and degausser of transformator, electric capacity only operates in degausser, is not involved in excitatory.
2. isolated drive circuit according to claim 1, it is characterised in that: described primary circuit, also include resistance R3 and diode D1, wherein, the Same Name of Ends of transformator draws the input as isolated drive circuit, for being connected with voltage source；The different name end of transformator passes through N type switch tube Q1 ground connection；One end of electric capacity is connected with the Same Name of Ends of transformator, and the other end of electric capacity is connected with the negative electrode of diode, and the anode of diode is connected with the different name end of transformator；Resistor coupled in parallel is at the two ends of electric capacity；Wherein,
The exciting circuit of the primary side winding of transformator, is only made up of the conduction path of N type switch tube Q1 and primary side winding；
The degausser of the primary side winding of transformator, when N type switch tube Q1 turns off, is made up of electric capacity, resistance, diode and primary side winding.
3. isolated drive circuit according to claim 1, it is characterised in that: described primary circuit, also include resistance R3 and diode D1, wherein, the Same Name of Ends of transformator draws the input as isolated drive circuit, for being connected with voltage source；The different name end of transformator passes through N type switch tube Q1 ground connection；The anode of diode is connected with the different name end of transformator, and the negative electrode of diode is connected with one end of electric capacity, the other end ground connection of electric capacity；Resistor coupled in parallel is at the two ends of electric capacity；Wherein,
The exciting circuit of the primary side winding of transformator, is only made up of the conduction path of N type switch tube Q1 and primary side winding；
The degausser of the primary side winding of transformator, when N type switch tube Q1 turns off, is made up of primary side winding and diode, electric capacity, resistance.
4. isolated drive circuit according to any one of claim 1 to 3, it is characterized in that: described secondary side rectification circuit, also include accelerating breaking circuit, described acceleration breaking circuit is made up of resistance R5, resistance R6, resistance R7, P type switching tube Q2, wherein, one end of resistance R5 is connected to the anode of diode D2, and the other end of resistance R5 is connected to P type switching tube Q2 grid；One end of resistance R6 is connected to the negative electrode of diode D2, and the other end is connected to P type switching tube Q2 source electrode, and one end of resistance R7 connects P type switching tube Q2 drain electrode, and the other end is connected to transformator T1 vice-side winding Ns1 different name end.
5. isolated drive circuit according to claim 4, it is characterised in that: described N type switch tube Q1 is NPN type triode or N-type field effect transistor；Described P type switching tube Q2 is PNP type triode or P type field effect transistor.
6. the isolated drive circuit according to any one of claim 1-3, it is characterised in that: described N type switch tube Q1 is NPN type triode or N-type field effect transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520984787.XU CN205377643U (en) | 2015-12-01 | 2015-12-01 | Isolating drive circuit |
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| CN201520984787.XU CN205377643U (en) | 2015-12-01 | 2015-12-01 | Isolating drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356728A (en) * | 2015-12-01 | 2016-02-24 | 广州金升阳科技有限公司 | Isolated drive circuit |
| CN111865093A (en) * | 2019-09-20 | 2020-10-30 | 广州金升阳科技有限公司 | Switching converter and conversion method thereof |
-
2015
- 2015-12-01 CN CN201520984787.XU patent/CN205377643U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356728A (en) * | 2015-12-01 | 2016-02-24 | 广州金升阳科技有限公司 | Isolated drive circuit |
| CN111865093A (en) * | 2019-09-20 | 2020-10-30 | 广州金升阳科技有限公司 | Switching converter and conversion method thereof |
| CN111865093B (en) * | 2019-09-20 | 2022-05-20 | 广州金升阳科技有限公司 | Switching converter and conversion method thereof |
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