CN201528275U - Self-adapting drive circuit of active clamping switch tube - Google Patents
Self-adapting drive circuit of active clamping switch tube Download PDFInfo
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- CN201528275U CN201528275U CN 200920218497 CN200920218497U CN201528275U CN 201528275 U CN201528275 U CN 201528275U CN 200920218497 CN200920218497 CN 200920218497 CN 200920218497 U CN200920218497 U CN 200920218497U CN 201528275 U CN201528275 U CN 201528275U
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Abstract
The utility model relates to a self-adapting drive circuit of an active clamping switch tube in the switch power supply field. Vin and Vss of circuit input ends are respectively connected with two ends of the active clamping signal detection winding Nf, an output end Gate is connected with an active clamping switch tube control end, the circuit comprises a frequency-voltage conversion control unit, a pulse width control unit, an input pulse current limiting shaping unit, a drive circuit unit and a power supply circuit unit which are electrically with each other, wherein, the circuit is also provided with an enabling port and an expanding function port. The circuit of the utility model is simple, has low cost, can be applied to a reverse stimulating quasi-resonance mode switch power supply converter, the utility model implements the voltage clamping function, not only can decrease the voltage stress of a master switch pipe, but also can reduce the electromagnetic noise of the switch power supply and improve the power supply electromagnetic compatible characteristic; meanwhile, the utility model can also decrease the wastage of the clamping circuit, improve the efficiency of the power supply, enable the performance of the reverse stimulating quasi-resonance mode switch power supply converter to be remarkably improved.
Description
Technical field
The utility model relates to field of switch power, specifically is meant to be used to drive a kind of self adaptation Drive and Control Circuit that the clamp switch pipe is realized the active clamp function in the active clamping circuir of the Switching Power Supply that adopts inverse-excitation type quasi-resonance control model.
Background technology
Anti-sharp quasi-resonance mode switch supply convertor is succinct owing to having circuit topology, switch tube zero voltage is open-minded, loss is little, noise is low, advantages such as the electromagnetic compatibility characteristic is good, can be widely used in the middle low power switching power converters, thereby use very popular at present, but, the anti-voltage that swashs the power switch pipe of quasi-resonance mode converter, current stress is big, the switch tube voltage ring spike schematic diagram that leakage inductance causes as shown in Figure 2, arrow indication place is the switch tube voltage ring spike that leakage inductance causes among the figure, this voltage ring spike must with as shown in Figure 3 by diode D5, resistance R 8, shown in a kind of RCD clamp circuit that capacitor C 5 is formed or Fig. 3 frame of broken lines by diode D6, resistance R 9, the another kind of RCD clamp circuit that capacitor C 6 is formed limits, otherwise, the switch tube voltage ring spike that leakage inductance causes can surpass the withstand voltage of switching tube and switching tube is damaged, therefore, anti-swash to adopt the active clamp mode to come leakage inductance ringing voltage spike on the clamper main switch in the quasi-resonance mode switch supply convertor.
At present in the switching power converters that adopts pwm pattern, the clamp circuit of power switch pipe mainly adopts the RCD clamper, the active clamp mode is adopted in the meeting that the power supply that power is bigger slightly has, the active-clamp mode can reduce the clamp circuit loss, reduce switch tube voltage stress, magnetic core of transformer can bi-directional symmetrical magnetize, and the voltage in the time of can reducing the main switch shutoff reduces switching loss.Though the active clamp mode has many good qualities, but need special-purpose integrated circuit to control main switch and clamping switch tube at present, if clamping switch tube is connected on the high potential point, then clamping switch tube need drive or drive with the integrated circuit of being with bootstrapping to drive function with transformer, has increased the complexity and the cost of circuit.
When anti-sharp quasi-resonance mode switch supply convertor adopts the active clamp mode, the drive waveforms of desirable clamping switch tube is shown in S2 among Fig. 6, be between the ON time Ton1 of clamping switch tube ON time Ton2 and main switch (waveform is shown in S1 among Fig. 6) overlapping region to be arranged, leave certain Dead Time Td and Tr, otherwise, clamping switch tube and main switch can cause common, the input voltage source short circuit are caused the loss of fault or power supply increase.It is single switch control that active clamp instead swashs quasi-resonance mode switch supply convertor essence, the frequency of active clamp switch can not influence the frequency of main switch, the frequency change of main switch then can influence the frequency change of clamp switch, otherwise, the ON time of clamp switch and the ON time of main switch have the overlapping region certainly, can cause fault to occur, thus the work schedule of circuit be with main switch work schedule serve as theme.Swash in the quasi-resonance mode switch supply convertor anti-, the ON time of power switch pipe and turn-off time are indefinite, it can change with the height of output loading size and input voltage, the measured waveform figure at the secondary winding Ns two ends that Fig. 4 and Fig. 5 are respectively Fig. 3 circuit diagram embodiment described in the utility model when a half of amount of exports fixed load and nominal load, the ON time of power switch pipe and turn-off time are all changing as can be seen, total variation tendency is when the descending variation of load, ON time and turn-off time all are to be shortened by long, be that switching frequency changes from low to high with the descending variation of load, therefore, the output pulse width that is used to drive the drive circuit of clamping switch tube must adapt to the variation of main switch frequency automatically, could guarantee the overlapping region can not occur between the ON time Ton1 of clamping switch tube ON time Ton2 and main switch.Dead Time Tr as shown in Figure 6 realizes than being easier to, only need detect behind the cut-off signals of main switch through the RC circuit delay Tr time is the conducting that exportable direct impulse goes to drive clamp switch, Dead Time Td as shown in Figure 6 realizes quite difficulty, because the shutoff of the driving pulse of clamp switch need detect the moment that the energy of transformer has been released fully generally speaking, otherwise when the bad judgement of clamp switch will turn-off, be subjected to the influence of the input capacitance and the switching speed of clamp switch, the shutoff of clamp switch has delay, and the conducting already of possibility main switch this moment, two phenomenons that switching tube is common can occur, can cause breaking down and loss of power increase.Therefore the drive circuit that designs the active clamp switch is more complicated and difficulty, and up to the present also not seeing has ripe commercial integrated circuit to realize instead swashing active clamp function under the quasi-resonance pattern.
The utility model content
The technical problem that the utility model need solve is: a kind of Drive and Control Circuit that realizes instead swashing the clamping switch tube of the active clamp function under the quasi-resonance pattern is provided, and this circuit will satisfy following requirement: 1) circuit is succinct, cost is low; 2) guarantee that the ON time of clamp switch and the ON time of main switch do not have the overlapping region, driveability is reliable and stable.
For solving the problems of the technologies described above, the technical scheme that the utility model circuit is taked is: the self-adaptive driving circuit that a kind of active clamping switch tube is provided, described circuit input end Vin, Vss are connected with the active clamp input winding Nf two ends of transformer respectively, output Gate connects the active clamping switch tube control end, comprising:
Frequency-voltage transitions control unit is used to produce the direct voltage that amplitude changes with the input pulse signal frequency of Vin end and exports to subordinate's pulse duration control unit use; The pulse duration control unit is connected with drive circuit unit, is used for the width of the forward drive pulse of control Driver Circuit unit output; Input pulse current limliting shaping unit is connected with drive circuit unit, offers drive circuit unit as drive signal after the pulse signal current limliting with the input of Vin end; Drive circuit unit directly connects the active clamping switch tube control end by output Gate, control active clamping switch tube work schedule; The induced voltage at the active clamp input winding Nf two ends of the transformer of introducing is held with Vin, Vss in the power supply circuits unit, is used for after the rectification pressure limiting to the drive circuit unit power supply, provides to drive required energy.
Further, described circuit also is provided for controlling the output enable port En that described circuit is exported and closed, this port all is connected with pulse duration control unit, input pulse current limliting shaping unit and drive circuit unit, and this port is as the expanded function port simultaneously.
Further, described circuit also can be provided with the expanded function port Exp that is used to expand the pulse duration control mode that is connected with the pulse duration control unit.
The self-adaptive driving circuit successful Application of active clamping switch tube described in the utility model swashs in the quasi-resonance mode switch supply convertor to anti-, realize voltage clamp function, make anti-sharp quasi-resonance mode switch supply convertor ratio not significantly improve with the cost performance of the utility model circuit.Be in particular in: the main switch voltage stress is reduced, and the two-way magnetization of magnetic core of transformer makes magnetic core energy reliable reset; 2) reduce Switching Power Supply electromagnetism noise, improve power supply electromagnetic compatibility characteristic; 3) reduce the loss of clamp circuit; Leakage, source voltage when 4) switching tube being turn-offed are low, and turn-off power loss reduces, and improve the efficient of power supply.
With respect to prior art, the beneficial effect of the utility model circuit also is:
1), circuit is succinct, cost is low, need not to adopt special use bootstrapping drive integrated circult expensive, the peripheral circuit complexity;
2), solved in the industry ubiquitous when anti-when swashing quasi-resonance mode switch supply convertor employing active clamp mode, the difficult problem that the Dead Time of switching power converters master power switch pipe and clamping switch tube is difficult to realize.
Description of drawings
Fig. 1 is an active clamp self adaptation Drive and Control Circuit module principle block diagram described in the utility model;
Fig. 2 is the anti-quasi-resonance mode switch supply convertor power switch drain-source voltage waveform schematic diagram that swashs described in the utility model;
Fig. 3 is the anti-quasi-resonance mode switch supply convertor RCD clamp circuit schematic diagram commonly used at present that swashs described in the utility model;
Fig. 4 is the actual measurement voltage oscillogram of Fig. 3 circuit diagram embodiment described in the utility model at the secondary winding Ns two ends of a half of amount of exports fixed load;
Fig. 5 is the actual measurement voltage oscillogram at the secondary winding Ns two ends of Fig. 3 circuit diagram embodiment described in the utility model when the amount of exports fixed load;
Fig. 6 is the desirable drive waveforms schematic diagram of active clamp described in the utility model;
Fig. 7 is the self-adaptive driving circuit module one specific embodiment circuit theory diagrams of active clamping switch tube described in the utility model;
Fig. 8 is the specific embodiment circuit theory diagrams that a kind of preferred performance of the self-adaptive driving circuit module of active clamping switch tube described in the utility model strengthens;
Fig. 9 is the self-adaptive driving circuit module application example one of active clamping switch tube described in the utility model;
Figure 10 is the self-adaptive driving circuit module application example two of active clamping switch tube described in the utility model.
Embodiment
For the ease of those skilled in the art will recognize that the utility model is described in further detail below in conjunction with specific embodiment and accompanying drawing.
As shown in Figure 1, the self-adaptive driving circuit of described active clamping switch tube is used for driving clamp switch pipe realization active clamp function in the Switching Power Supply of inverse-excitation type quasi-resonance control model, and circuit specifically comprises: the drive circuit unit that is electrically connected mutually, frequency-voltage transitions control unit, pulse duration control unit, input pulse current limliting shaping unit and power supply circuits unit.
Said units is formed a circuit module, and this circuit module comprises three essential ports at least, is respectively Vin, Gate, Vss, can be applied in the Switching Power Supply easily.Wherein, Vin, Vss are connected with the active clamp input winding Nf two ends of transformer in the Switching Power Supply respectively, and Vin is a signal input part, and Vss is an electrical reference signal position end; The Gate port connects the active clamping switch tube control end as output.Described circuit module also can be provided with two ports of En, Exp, and the En port all is connected with pulse duration control unit, input pulse current limliting shaping unit and drive circuit unit, and this port is as the enable port or the expanded function port of entire circuit module; The Exp port is connected with the pulse duration control unit, as the expanded function port of expansion pulse duration control mode.
Fig. 7 is the self-adaptive driving circuit one specific embodiment circuit diagram of active clamping switch tube described in the utility model.As figure, described frequency-voltage transitions control unit comprises resistance R 2, capacitor C 1, diode D2 and the capacitor C 2 that is serially connected in successively between input Vin, the Vss, diode D3 anode connects the tie point that Vss holds, negative electrode connects diode D2 anode and capacitor C 2, and diode D2 negative electrode connects the pulse duration control unit.Described drive circuit unit comprises triode Q1, Q2, and the emitter of Q1, Q2 links together as the Gate output port, and the Q1 collector electrode connects the power supply circuits unit, and the collector electrode of Q2 connects the Vss end.Described input pulse current limliting shaping unit comprises resistance R 3, capacitor C 3, the voltage stabilizing didoe ZD1 that is serially connected in successively between input Vin, the Vss, and the negative electrode of ZD1 connects the Vss end with the anode that the tie point of capacitor C 3 is connected drive circuit unit two triode Q1, Q2 base stage, ZD1 simultaneously; Described port En connects the negative electrode of voltage stabilizing didoe ZD1.Described pulse duration control unit comprises the resistance R 4 and the capacitor C 4 of the resistance R 5 of series connection and R6, series connection; Triode Q3 collector electrode connects capacitor C 3, base stage connecting resistance resistance R 5 one ends, and the intersection point of resistance R 4 and capacitor C 4; Resistance R 7 is connected with R5, R6 intersection point, the diode D2 negative electrode of another termination frequency-voltage transitions control unit of resistance; The other end of the other end of capacitor C 4, triode Q3 emitter, resistance R 7 connects the Vss end simultaneously; Diode D4 is parallel to resistance R 4 two ends, and the intersection point of its anode and R4, C4 meets expanded function port Exp.Described power supply circuits unit comprises diode in series D1, resistance R 1, and resistance R 1 one ends are connected with input Vin, and the other end connects diode D1 anode, and the D1 negative electrode connects the collector electrode of drive circuit unit triode Q1.
Fig. 7 circuit working principle is as follows: 1., the Nf winding of described circuit Vin port and Vss port receiving transformer T1 produce 3 pin for just, 4 pin are negative induced voltage, this voltage is given the driving circuit section of being made up of Q1 and Q2 power supply after power supply circuits unit current limliting that resistance R 1, diode D1 are formed and rectification, provide and export the required driving and the energy of shutoff; 2., provide drive signal for drive circuit unit after the input pulse current limliting shaping unit current limliting shaping formed via resistance R 3, capacitor C 3, voltage stabilizing didoe ZD1 of the input pulse signal of Vin port, the major function of R3, C3 is restriction driving voltage and electric current, the major function of ZD1 is to the forward of input pulse and negative clamping, pulse is clamped at+Vz and-Vf between, wherein Vz is the zener voltage of ZD1, and Vf is the forward conduction magnitude of voltage; 3., the input pulse signal of Vin port can also be via resistance R 2, capacitor C 1, C2, diode D2, frequency-voltage transitions control unit that D3 forms produces the direct voltage that amplitude changes with the input pulse signal frequency of Vin port at the C2 two ends, when the input pulse signal frequency is hanged down, C2 two ends direct voltage is also low, when frequency is high, C2 two ends direct voltage is also just high, the main effect of R2 is a current limliting, the main effect of C1 is current limliting and the tracking that realizes frequency change, utilized the characteristic of the logical high frequency resistance low frequency of electric capacity, the effect of D2 is C1 to be flow through the input pulse rectification that comes charge to C2, and the effect of D3 is that the electric current of C1 can be two-way circulated; 4., the last direct voltage with frequency change of C2 is input to by resistance R 4, R5, R6, R7, diode D4, capacitor C 4, the pulse duration control unit that NPN triode Q3 forms, remove the width of the forward drive pulse of control output end, Q3 mainly has been comparator and on-off action, C4 is as timing capacitor, resistance R 4, R5, R6, R7 mainly is the charging current power of control to capacitor C 4, diode D4 mainly be at input pulse when negative, the charge discharging resisting that C4 is stored falls, capacitor C 4 is resetted, for next charge cycle is prepared, when the direct voltage on the C2 during with frequency change, through resistance R 5, R6, behind the R7, charging current to C4 also will be along with change, the charging current of this road charging current and the R4 that flows through is together to the charging of C4, when the Vin positive pulse is come, C4 begins charging, voltage rises, when reaching the unlatching thresholding of Q3, the Q3 saturation conduction, make the Gate port output of module become low level, when the input pulse frequency is high, C2 both end voltage height, charging is accelerated, the very fast conducting of Q3, the pulse duration of output diminishes, when the input pulse frequency was low, the C2 both end voltage was low, and it is slack-off to charge, the Q3 conducting prolongs, the pulse duration of output broadens, and knows from Fig. 4 and Fig. 5, instead swashs the highest and load of quasi-resonance mode switch supply convertor input AC when the lightest, switching frequency is the highest, and when instead swashing the minimum and full load of quasi-resonance mode switch supply convertor input AC, switching frequency is minimum, by the control suitable parameters, can realize that the driving pulse width of exporting is the variation that the ON time of clamp switch can adapt to switching frequency automatically, thereby guarantee the realization of active clamp function; 5., choosing by suitable controlling resistance R4, R5, R6, R7 and capacitor C 4, guarantee that to swash quasi-resonance mode switch supply convertor input AC the highest with load when the lightest when anti-, the Gate port positive output time T on2 of module is less than the turn-off time of main switch, one section Dead Time Td is promptly arranged before the main switch conducting, and when anti-when swashing the minimum and full load of quasi-resonance mode switch supply convertor input AC, still it is constant substantially to keep Dead Time Td, is to realize the anti-key point that swashs the active clamp of quasi-resonance mode switch supply convertor.
As shown in Figure 8, be the self-adaptive driving circuit one preferred embodiment circuit diagram of active clamping switch tube described in the utility model.This embodiment is than having increased resistance R 0 and triode Q0 in the pulse duration control unit in embodiment illustrated in fig. 7, wherein triode Q3 collector electrode is connected with triode Q0 base resistance and R0 one end, the other end of R0 is connected the back and is connected with the En port with the Q0 emitter, the collector electrode of Q0 connects the Vss end.Purpose is that comparator and the switching circuit turn-off speed be made up of triode Q3, Q0 and resistance R 0 are accelerated, and reduces turn-off delay, can shorten the setting of minimum Dead Time Td.
NPN triode Q3 among above-mentioned Fig. 7, Fig. 8 two embodiment all can be substituted by three end adjustable precision voltage-reference TL432, realize comparator and the switching function of triode Q3, its benefit is, the threshold voltage of three end adjustable precision voltage-references is relatively accurate, can make the output pulse width precision of self-adaptive driving circuit of active clamping switch tube controlled.Concrete, the anode A node of three end adjustable precision voltage-references links to each other with the Vss port of described circuit module, negative electrode Cathode is connected with the En port of described circuit module, reference edge Reference is connected with capacitor C 4, resistance R 4, R5.
As Fig. 9, be the self-adaptive driving circuit application example of described active clamping switch tube.The Vin port of the self-adaptive driving circuit module of described active clamping switch tube links to each other with anti-3 pin that swash the active clamp input winding Nf of the transformer T1 in the quasi-resonance mode switch supply convertor, the Vss port of 4 pin of Nf and self adaptation Drive and Control Circuit module, 2 ends of the elementary winding Np of T1, the drain electrode of master power switch pipe Q5 and the source electrode of clamping switch tube Q6 link to each other, the Gate port of self adaptation Drive and Control Circuit module and the grid of Q6 link to each other, the end of the drain electrode of Q6 and clamp capacitor C8 links to each other, the other end of C8 links to each other with 1 end of the elementary winding Np of input high potential V+ port and T1, and 3 pin of the active clamp input winding Nf of 2 ends of the elementary winding Np of T1 and T1 are with the inscription end.
The circuit working principle of above-mentioned application example is as follows: have no progeny when main switch Q5 closes, produce 3 pin for just at the Nf of transformer T1 winding, 4 pin are negative induced voltage, this voltage is input to the Vin port and the Vss port of module, after the inside modules processing of circuit, go to drive clamping switch tube Q6 conducting at the Gate of module port output driving pulse, as shown in Figure 6, clamping switch tube Q6 ON time Ton2 is controlled by the inside modules circuit, the ON time Ton1 that turn-off time equals main switch Q5 adds Dead Time Td and Tr, clamp capacitor C8 can be added in the two ends of the elementary winding Np of transformer T1 by Q6, make the voltage ring spike that produces because of transformer leakage inductance to be sponged by the C8 clamper, reduced the voltage stress of main switch Q5, voltage when Q5 is turn-offed reduces, reduce turn-off power loss, improved efficient, reduced electromagnetic noise.
The another kind of concrete application example of the utility model as shown in figure 10, the Vin port of the self-adaptive driving circuit module of described active clamping switch tube links to each other with anti-3 pin that swash the active clamp input winding Nf of the transformer T1 in the quasi-resonance mode switch supply convertor, 4 pin of Nf and the Vss port of described circuit module, 2 ends of the elementary winding Np of T1, the drain electrode of master power switch pipe Q7 and the source electrode of clamping switch tube Q8 link to each other, the Gate port of self adaptation Drive and Control Circuit module and the grid of Q8 link to each other, the end of the drain electrode of Q8 and clamp capacitor C9 links to each other, the other end of C9 links to each other with input electronegative potential V-port, and 3 pin of the active clamp input winding Nf of 2 ends of the elementary winding Np of T1 and T1 are ends of the same name.The same Fig. 9 of its operation principle does not repeat them here.
Need to prove; above-mentioned execution mode only is the preferable embodiment of the utility model; it can not be interpreted as restriction to the utility model protection range; do not breaking away under the utility model design prerequisite, any impartial the variation with modification that the utility model is done all belongs to protection range of the present utility model.
Claims (10)
1. the self-adaptive driving circuit of an active clamping switch tube, input Vin, Vss are connected with the active clamp input winding Nf two ends of transformer respectively, and output Gate connects the active clamping switch tube control end, it is characterized in that, comprising:
Frequency-voltage transitions control unit is used to produce the direct voltage that amplitude changes with the input pulse signal frequency of Vin end and exports to subordinate's pulse duration control unit use;
The pulse duration control unit is connected with drive circuit unit, is used for the width of the forward drive pulse of control Driver Circuit unit output;
Input pulse current limliting shaping unit is connected with drive circuit unit, will offer drive circuit unit as drive signal after the pulse signal current limliting of Vin end input and the shaping;
Drive circuit unit directly connects the active clamping switch tube control end by output Gate, control active clamping switch tube work schedule;
The induced voltage at the active clamp input winding Nf two ends of the transformer of introducing is held with Vin, Vss in the power supply circuits unit, is used for after the rectification to the drive circuit unit power supply, provides to drive required energy.
2. the self-adaptive driving circuit of active clamping switch tube according to claim 1, it is characterized in that: further comprise being used to control the output enable port En that described circuit is exported and closed, this port all is connected with pulse duration control unit, input pulse current limliting shaping unit and drive circuit unit, and this port is as the expanded function port simultaneously.
3. the self-adaptive driving circuit of active clamping switch tube according to claim 1 and 2 is characterized in that: further comprise the expanded function port Exp that is used to expand the pulse duration control mode that is connected with the pulse duration control unit.
4. the self-adaptive driving circuit of active clamping switch tube according to claim 3, it is characterized in that: described frequency-voltage transitions control unit comprises resistance R 2, capacitor C 1, diode D2 and the capacitor C 2 that is serially connected in successively between input Vin, the Vss, diode D3 anode connects the tie point that Vss holds, negative electrode connects diode D2 anode and capacitor C 2, and diode D2 negative electrode connects the pulse duration control unit.
5. the self-adaptive driving circuit of active clamping switch tube according to claim 3 is characterized in that: described pulse duration control unit comprises the resistance R 4 and the capacitor C 4 of the resistance R 5 of series connection and R6, series connection; Triode Q3 collector electrode connects capacitor C 3, base stage connecting resistance resistance R 5 one ends, and the intersection point of resistance R 4 and capacitor C 4; Resistance R 7 is connected with R5, R6 intersection point, the diode D2 negative electrode of another termination frequency-voltage transitions control unit of resistance; The other end of the other end of capacitor C 4, triode Q3 emitter, resistance R 7 connects the Vss end simultaneously; Diode D4 is parallel to resistance R 4 two ends, and the intersection point of its anode and R4, C4 meets expanded function port Exp.
6. the self-adaptive driving circuit of active clamping switch tube according to claim 3, it is characterized in that: described pulse duration control unit further comprises triode Q0 and resistance R 0, wherein triode Q3 collector electrode is connected with triode Q0 base resistance and R0 one end, the other end of R0 is connected the back and is connected with the En port with the Q0 emitter, the collector electrode of Q0 connects the Vss end.
7. the self-adaptive driving circuit of active clamping switch tube according to claim 3, it is characterized in that: described drive circuit unit comprises triode Q1, Q2, the emitter of Q1, Q2 links together as the Gate output port, the Q1 collector electrode connects the power supply circuits unit, and the collector electrode of Q2 connects the Vss end.
8. the self-adaptive driving circuit of active clamping switch tube according to claim 3, it is characterized in that: described input pulse current limliting shaping unit comprises resistance R 3, capacitor C 3, the voltage stabilizing didoe ZD1 that is serially connected in successively between input Vin, the Vss, and the negative electrode of ZD1 connects the Vss end with the anode that the tie point of capacitor C 3 is connected drive circuit unit two triode Q1, Q2 base stage, ZD1 simultaneously; Described port En connects the negative electrode of voltage stabilizing didoe ZD1.
9. the self-adaptive driving circuit of active clamping switch tube according to claim 3, it is characterized in that: described power supply circuits unit comprises diode in series D1, resistance R 1, resistance R 1 one ends are connected with input Vin, the other end connects diode D1 anode, and the D1 negative electrode connects the collector electrode of drive circuit unit triode Q1.
10. according to the self-adaptive driving circuit of claim 5 or 6 described active clamping switch tubes, it is characterized in that: described triode Q3 can adopt three end adjustable precision voltage-references to replace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920218497 CN201528275U (en) | 2009-10-09 | 2009-10-09 | Self-adapting drive circuit of active clamping switch tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920218497 CN201528275U (en) | 2009-10-09 | 2009-10-09 | Self-adapting drive circuit of active clamping switch tube |
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| CN201528275U true CN201528275U (en) | 2010-07-14 |
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| CN 200920218497 Expired - Lifetime CN201528275U (en) | 2009-10-09 | 2009-10-09 | Self-adapting drive circuit of active clamping switch tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113614822A (en) * | 2019-03-29 | 2021-11-05 | 拉碧斯半导体株式会社 | Display driving apparatus |
| CN114245961A (en) * | 2019-05-01 | 2022-03-25 | 罗姆电力技术控股有限公司 | High efficiency passive clamp |
| US11996785B1 (en) | 2022-11-17 | 2024-05-28 | Rompower Technology Holdings, Llc | High efficiency AC-DC converter |
-
2009
- 2009-10-09 CN CN 200920218497 patent/CN201528275U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113614822A (en) * | 2019-03-29 | 2021-11-05 | 拉碧斯半导体株式会社 | Display driving apparatus |
| CN114245961A (en) * | 2019-05-01 | 2022-03-25 | 罗姆电力技术控股有限公司 | High efficiency passive clamp |
| US11996785B1 (en) | 2022-11-17 | 2024-05-28 | Rompower Technology Holdings, Llc | High efficiency AC-DC converter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100714 Effective date of abandoning: 20091009 |