CN101771343B - Driving circuit of high-voltage frequency converter - Google Patents
Driving circuit of high-voltage frequency converter Download PDFInfo
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- CN101771343B CN101771343B CN2010101163351A CN201010116335A CN101771343B CN 101771343 B CN101771343 B CN 101771343B CN 2010101163351 A CN2010101163351 A CN 2010101163351A CN 201010116335 A CN201010116335 A CN 201010116335A CN 101771343 B CN101771343 B CN 101771343B
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Abstract
The invention discloses a driving circuit of a high-voltage frequency converter, and the circuit is simple and convenient, has low cost and simultaneously can greatly save energy consumption. The high-voltage frequency converter in the invention comprises a PWM signal incoming end, a triode T1, a base resister R1 of the triode T1, a collector resister R2 of the triode T1, a driving chip, a cascading resister R3 at the output side and a driving end light fiber head HFBR-1521. The invention is characterized in that the driving chip is a push-pull circuit composed of an NPN tube and a PNP tube connected in series; the base electrodes of the NPN tube and the PNP tube are connected to the end at which the collector electrodes of the resister R2 and the triode T1 are connected; the collector electrode of the NPN tube is connected to the other end of the resister R2 and to the power VCC; and the collector electrode of the PNP tube is connected to the emitting electrode of the triode T1 and to the ground.
Description
Technical field
The present invention relates to a kind of circuit,, belong to field of power electronics more specifically to a kind of driving circuit of high-voltage frequency converter.
Background technology
Along with the development of power electronic technology, the power of IGBT module is increasing, and dc voltage is increasingly high; Operating frequency is also increasingly high, and the problem of thereupon bringing is interfering with each other between the drive signal, when long distance drives transmission; High-frequency current causes distortion, problems such as time-delay to the interference signal of drive signal in the frequency converter; In order to avoid these problems, engineers has adopted a lot of methods all not obtain very good effect, is referred to the driving field up to optical fiber technology; Interference problem has just obtained basic solution, and has obtained extensive use very soon.And the optical fiber driving needs the special driving chip, this chip somewhat expensive (general about 10 yuan), and with when the optical fiber emitting head is connected work; Failure rate is very high, simultaneously because chip for driving and optical fiber head alternation, makes the power supply continuous firing; For pwm signal; Wasted one times power supply energy, the volume of power supply increases and is twice, for requiring today the more and more littler trend of machine to run in the opposite direction.
As shown in Figure 1; What existing driving circuit of high-voltage frequency converter generally adopted is the DS75741 chip for driving, and this chip internal can equivalence be the structure that a not gate drives a triode job, is a kind of chip for driving commonly used; Process number of applications in early stage has been found a series of problems of its existence; Say that like top institute because long-term high-frequency current, the failure of chip rate is very high; Adopt this working method simultaneously, optical fiber head and chip for driving DS75741 alternation, high or low no matter pwm signal is in, inculcating electric current is continuous firing 60mA, is a no small waste for energy consumption.Like Fig. 1, during work, it is the pwm signal of 5V that signal end inserts amplitude, when PWM is high level; The triode base is penetrated pressure drop and is about 0.7V, and base current is about (5-0.7)/2K=2.15mA, because the HFE of triode is 100, resistance R 2 is 10K; So triode is in saturation condition, be output as low level, according to the logic of DS75741, the conducting of chip internal triode; Be in saturation condition, output voltage is the about 0.3V of triode saturation voltage drop, so pressure drop is about 4.7V above the pull-up resistor R3, this moment, optical fiber head was not worked; Electric current on the pull-up resistor R3 is 4.7/51=92mA, and power consumption mainly on R3, is approximately 0.5W.
When PWM was low level, triode was in cut-off state, so collector electrode is output as high level 5V; According to the logic level of chip for driving, inner triode ends, and is equivalent to open circuit; So this time, electric current all flows to the inner light-emitting diode of optical fiber head HFBR-1521 through R3, because the about 1.6V of interior light emitting diodes pressure drop; Non-essential resistance R3 goes up resistance and is about 3.4V; The HFBR-1521 operating current is about 3.4/5.1=67mA, and power consumption is about 0.33W, and the relative PWM of power consumption descends when being high level to some extent.But generally speaking, no matter optical fiber head work with do not work, circuit all dissipation of energy can occur, and is very unreasonable.And the power consumption of optical fiber head when not working is bigger; From this aspects, extremely waste energy, the requirement to power supply simultaneously also increases; Highly energy-consuming also can influence the life-span of device to some extent in addition, the driving circuit of high-voltage frequency converter that therefore needs a kind of more simple cheap of exploitation and do not waste energy.
Summary of the invention
The present invention has well solved deficiency and the problem that exists in the above-mentioned prior art, and a kind of driving circuit of high-voltage frequency converter is provided, and the simple and convenient cost of this circuit is low, conserve energy loss greatly simultaneously.
Technical scheme of the present invention is following:
Driving circuit of high-voltage frequency converter of the present invention; Include collector resistance R2, the chip for driving of base resistance R1, the triode T1 of pwm signal incoming end, triode T1, triode T1, the series resistor R3 and the drive end optical fiber head HFBR-1521 of outlet side; It is characterized in that described chip for driving is a NPN pipe and the push-pull circuit that the PNP pipe is composed in series; The NPN pipe is connected to the end that resistance R 2 is connected with the collector electrode of triode T1 jointly with the base stage of PNP pipe, and the NPN pipe collector is connected to resistance R 2 other ends, and is connected on the power supply VCC; The collector electrode of PNP pipe is connected to the emitter of triode T1, and is connected to ground.
Driving circuit of high-voltage frequency converter of the present invention, its further technical scheme are that described pwm signal access amplitude is 5V, and the pwm signal incoming end is connected with the base resistance R1 of triode T1; The size of resistance R 1 is 51K; The size of the collector resistance R2 of triode T1 is 2K, and resistance R 3 sizes that are connected in series with the emitter of NPN pipe and PNP pipe are 30 Europe, and resistance R 3 is received 1 pin of optical fiber head HFBR-1521; And keep the parallel resistance R4 between 1 pin and 2 pin, the size of R4 is 2K.When optical fiber is the length about 2 meters, R3 can select 60 ohm resistance for use, and this moment, drive current was 35mA more, and driving force can reach requirement.
Driving circuit of high-voltage frequency converter of the present invention, its further technical scheme can also be that the pwm signal incoming end at this driving circuit of high-voltage frequency converter is parallel with a filter capacitor and comes the filtering peak voltage; Further technical scheme is that the size of filter capacitor is 10PF when pwm signal access amplitude is 5V again.
Driving circuit of high-voltage frequency converter of the present invention, the big I of the series resistor R3 that its further technical scheme can also be described chip for driving outlet side is adjusted to satisfy the desired drive current of driving force according to the length of fibre circuit.
The present invention has following beneficial effect:
When driving circuit of high-voltage frequency converter of the present invention was high level when pwm signal, the push-pull circuit optical fiber head was not all worked, so there is not energy loss; When pwm signal when being low level, optical fiber head can operate as normal, and voltage has been divided into basic three average parts; A part is on the inner light-emitting diode of optical fiber head; Another part is on R3, and some is on the NPN triode, so more disperse than original two parts heat; So that temperature rise also can further reduce, and has so just increased the working life of device.Because energy consumption has reduced not enough original half the, so that power supply capacity also can be done is littler, can be controlled better on the cost, can practice thrift cost greatly.Simultaneously because the dispersion of energy loss makes the life-span of device to improve greatly.On general knowledge, also know in addition, simple combination of devices, its performance is stable more, and the complicated out of order probability of combination is big more, so the reliability of this circuit also can further improve.Owing to be independently small number of devices combination,, can be more widely used so the response time also can further improve.
Description of drawings
Fig. 1 is existing driving circuit of high-voltage frequency converter structural representation
Fig. 2 is the driving circuit of high-voltage frequency converter electrical block diagram of the utility model
Embodiment
Below in conjunction with accompanying drawing technology contents of the present invention is explained:
As shown in Figure 2; Driving circuit of high-voltage frequency converter of the present invention; Include collector resistance R2, the chip for driving of base resistance R1, the triode T1 of pwm signal incoming end, triode T1, triode T1, the series resistor R3 and the drive end optical fiber head HFBR-1521 of outlet side, it is characterized in that the described chip for driving push-pull circuit that to be a NPN pipe be composed in series with a PNP pipe, the NPN pipe is connected to the end that resistance R 2 is connected with the collector electrode of triode T1 jointly with the base stage that PNP manages; The NPN pipe collector is connected to resistance R 2 other ends; And be connected on the power supply VCC, the collector electrode of PNP pipe is connected to the emitter of triode T1, and is connected to ground.It is 5V that described pwm signal inserts amplitude; The pwm signal incoming end is connected with the base resistance R1 of triode T1, and the size of resistance R 1 is 51K, and the size of the collector resistance R2 of triode T1 is 2K; Resistance R 3 sizes that are connected in series with push-pull circuit output are 30 Europe; Resistance R 3 is received 1 pin of optical fiber head HFBR-1521, and keeps the parallel resistance R4 between 1 pin and 2 pin, and the size of R4 is 2K.
This execution mode signal end inserts the pwm signal that amplitude is 5V equally, and when PWM was high level 5V, the triode base was penetrated pressure drop and is about 0.7V, and base current is about (5-0.7)/51K=0.084mA.Because the HFE of triode is 100, resistance R 2 is 2K, according to the current amplification factor of triode, is easy to obtain triode and is in saturation condition; Be output as low level, be about 0.3V, in push-pull circuit; The NPN triode is in cut-off state, so push-pull circuit output is equivalent to off state, the input side of DS75741 is a low level; DS75741 is in off position, because no current flows through push-pull circuit and optical fiber head, so basic noenergy loss.
When PWM was low level, the base stage no current flow through, so triode T1 is in cut-off state, collector electrode is output as high level 5V, and the NPN plumber of push-pull circuit does, and the PNP pipe ends.Show that according to experimental data the last voltage of R2 is 0.8V, the base stage of the NPN pipe of push-pull circuit. press to be 0.7V; The last voltage of R3 is 1.9V; The inner light-emitting diode of optical fiber head is 1.6V, and the Vce of NPN pipe is 1.5V, and the operating current that can calculate optical fiber head according to the voltage on the R3 is 1.9V/30 Europe=63mA; Running parameter by HFBR-1521 learns that this electric current can satisfy the operate as normal of optical fiber head.
Claims (5)
1. driving circuit of high-voltage frequency converter; Include collector resistance R2, the chip for driving of base resistance R1, the triode T1 of pwm signal incoming end, triode T1, triode T1, the series resistor R3 and the drive end optical fiber head HFBR-1521 of outlet side; It is characterized in that described chip for driving is a NPN pipe and the push-pull circuit that the PNP pipe is composed in series; The NPN pipe is connected to the end that resistance R 2 is connected with the collector electrode of triode T1 jointly with the base stage of PNP pipe, and the NPN pipe collector is connected to resistance R 2 other ends, and is connected on the power supply VCC; The collector electrode of PNP pipe is connected to the emitter of triode T1, and is connected to ground.
2. driving circuit of high-voltage frequency converter according to claim 1 is characterized in that it is 5V that described pwm signal inserts amplitude, and the pwm signal incoming end is connected with the base resistance R1 of triode T1; The size of resistance R 1 is 51K; The size of the collector resistance R2 of triode T1 is 2K, and resistance R 3 sizes that are connected in series with push-pull circuit output are 30 Europe, and resistance R 3 is received 1 pin of optical fiber head HFBR-1521; And keep the parallel resistance R4 between 1 pin and 2 pin, the size of R4 is 2K.
3. driving circuit of high-voltage frequency converter according to claim 1 is characterized in that pwm signal incoming end at this driving circuit of high-voltage frequency converter is parallel with a filter capacitor and comes the filtering peak voltage.
4. driving circuit of high-voltage frequency converter according to claim 3 is characterized in that the size of filter capacitor is 10PF when pwm signal access amplitude is 5V.
5. driving circuit of high-voltage frequency converter according to claim 1 is characterized in that the size of the series resistor R3 of described chip for driving outlet side is adjusted to satisfy the desired drive current of driving force according to the length of fibre circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101163351A CN101771343B (en) | 2010-03-02 | 2010-03-02 | Driving circuit of high-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101163351A CN101771343B (en) | 2010-03-02 | 2010-03-02 | Driving circuit of high-voltage frequency converter |
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| CN101771343A CN101771343A (en) | 2010-07-07 |
| CN101771343B true CN101771343B (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101163351A Active CN101771343B (en) | 2010-03-02 | 2010-03-02 | Driving circuit of high-voltage frequency converter |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872909B (en) * | 2014-03-28 | 2017-01-11 | 珠海万力达电气自动化有限公司 | Optical fiber drive circuit |
| WO2019024877A1 (en) * | 2017-08-04 | 2019-02-07 | 苏州欧普照明有限公司 | Signal conversion circuit, dimming led driving source and lamp |
| CN112256076B (en) | 2020-10-20 | 2022-05-24 | 山特电子（深圳）有限公司 | Drive circuit for switching transistor and drive device including the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094087A (en) * | 1997-07-30 | 2000-07-25 | Lucent Technologies Inc. | Gate drive circuit for isolated gate devices and method of operation thereof |
| CN201656773U (en) * | 2010-03-02 | 2010-11-24 | 南京亚派科技实业有限公司 | High-voltage frequency converter drive circuit |
-
2010
- 2010-03-02 CN CN2010101163351A patent/CN101771343B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094087A (en) * | 1997-07-30 | 2000-07-25 | Lucent Technologies Inc. | Gate drive circuit for isolated gate devices and method of operation thereof |
| CN201656773U (en) * | 2010-03-02 | 2010-11-24 | 南京亚派科技实业有限公司 | High-voltage frequency converter drive circuit |
Non-Patent Citations (1)
| Title |
|---|
| 陈长江.IGBT驱动保护电路EXB841的应用研究.《武汉船舶职业技术学院学报》.2004,(第4期),21-23. * |
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| CN101771343A (en) | 2010-07-07 |
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Owner name: NAIJING APAITEK TECHNOLOGY CO., LTD. Free format text: FORMER NAME: YAPAI SCIENCE + TECHNOLOGY INDUSTRY CO., LTD., NANJING |
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Address after: 211131, Tangshan District, Jiangsu City, Jiangning province Tangshan industrial concentration zone, two road seven weft road junction of Nanjing Patentee after: NANJING APAITEK TECHNOLOGY CO., LTD. Address before: 211131, Tangshan District, Jiangsu City, Jiangning province Tangshan industrial concentration zone, two road seven weft road junction of Nanjing Patentee before: Yapai Science & Technology Industry Co., Ltd., Nanjing |