CN108649932A - The adjustable transformer isolation driving method of space wide scope duty ratio - Google Patents
The adjustable transformer isolation driving method of space wide scope duty ratio Download PDFInfo
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- CN108649932A CN108649932A CN201810487016.8A CN201810487016A CN108649932A CN 108649932 A CN108649932 A CN 108649932A CN 201810487016 A CN201810487016 A CN 201810487016A CN 108649932 A CN108649932 A CN 108649932A
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- 238000002955 isolation Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007599 discharging Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/156—Arrangements in which a continuous pulse train is transformed into a train having a desired pattern
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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Abstract
The present invention relates to a kind of adjustable transformer isolation driving methods of space wide scope duty ratio to export the drive signal of 0%~100% duty ratio by using connected first via transformer isolation circuit and the second tunnel transformer isolation circuit；Wherein, include per road transformer isolation circuit：Totem-pote circuit enhances its driving capability to the drive signal of input；Pulse transformer is connect with the output end of totem-pote circuit by circuit, and the drive signal to enhancing driving capability carries out signal isolation；The output end of the pulse transformer of two-way transformer isolation circuit is connected in series with by the first triode and first resistor, and the output end of the pulse transformer of the two-way transformer isolation circuit is further connected to the grid and source electrode of switching tube MOSFET.The present invention realizes the drive signal of 0%~100% duty ratio of output by using two-way transformer isolation circuit；With high integration, and meet the requirement in space exploration field.
Description
Technical Field
The invention relates to a transformer isolation driving method, in particular to a transformer isolation driving structure with adjustable space wide-range duty ratio, which can realize 0-100% wide-range variable duty ratio through a transformer and belongs to the technical field of spaceflight.
Background
The space detection is the leading-edge field of the scientific and technological development in the world at present, and has strong foundation, foresight, innovation and passivity. Due to the particularity of the space field, when the isolation device is applied to drive the switch tube, the optical coupling isolation device commonly used in the ground field cannot be adopted, and at the moment, the pulse transformer isolation structure is generally required to be adopted to drive the switch tube. However, because the transformer needs magnetic reset, the duty ratio can only reach about 90% at most in general, and some application occasions in the space field need an isolation driving structure with a widely-varied duty ratio of 0% -100%.
Therefore, based on the above, the invention provides a transformer isolation driving method with a wide space range and an adjustable duty ratio, so as to solve the defects and limitations in the prior art.
Disclosure of Invention
The invention aims to provide a transformer isolation driving method with adjustable duty ratio in a wide space range, which is characterized in that two transformer isolation circuits are adopted to output a driving signal with 0-100% duty ratio; has high integration level and meets the requirements of the space detection field.
In order to achieve the purpose, the invention provides a transformer isolation driving method with adjustable duty ratio in a wide space range, which adopts a first path of transformer isolation circuit and a second path of transformer isolation circuit which are connected to output a driving signal with 0-100% duty ratio; wherein, every way transformer isolation circuit contains: the totem-pole circuit enhances the driving capability of the input driving signal; the pulse transformer is connected with the output end of the totem-pole circuit through a circuit and used for carrying out signal isolation on the driving signal with enhanced driving capability; the output ends of the pulse transformers of the two transformer isolation circuits are connected in series through a first triode and a first resistor, and the output ends of the pulse transformers of the two transformer isolation circuits are also respectively connected to the grid electrode and the source electrode of the MOSFET.
The first path of driving signal input into the first path of transformer isolation circuit is used for charging the grid source end of the MOSFET of the switch tube after being enhanced and isolated, and the second path of driving signal input into the second path of transformer isolation circuit is used for discharging the grid source end of the MOSFET of the switch tube after being enhanced and isolated.
The first path of driving signal and the second path of driving signal are both driving signals with 50% duty ratio; when the first path of driving signal is always conducted, the MOSFET of the switching tube outputs a driving signal with 100% duty ratio; when the second path of driving signal is always conducted, the MOSFET of the switching tube outputs a driving signal with 0% duty ratio.
And a seventh resistor is connected between the output end of the pulse transformer of the first path of transformer isolation circuit and the first resistor.
The seventh resistor is a charging resistor for the gate source end of the MOSFET; the first resistor is a discharge resistor for the gate source end of the MOSFET of the switching tube; the rising edge and the falling edge of the driving signal output by the switching tube MOSFET are controlled by controlling the seventh resistor and the first resistor.
And a first diode is also connected between the output end of the pulse transformer of the first path of transformer isolation circuit and the first resistor, and current backflow is prevented in the charging process of the gate source end of the MOSFET.
And modulating by adopting a first path of PWM initial driving signal and a second path of PWM initial driving signal with the switching frequency higher than that of the first path of PWM initial driving signal in an AND mode to obtain the first path of driving signal and the second path of driving signal.
And the switching frequency of the second path of PWM initial driving signal is 10 times or more than that of the first path of PWM initial driving signal.
The duty ratio of the first path of PWM initial driving signal is 0% -100%, and the duty ratio of the second path of PWM initial driving signal is 50%.
In summary, the transformer isolation driving method with the adjustable duty ratio in the wide space range provided by the invention decomposes the driving signal on two transformer isolation circuits, wherein one circuit is responsible for charging the GS end of the switching tube, and the other circuit is responsible for discharging the GS end of the switching tube, so as to output the driving signal with the duty ratio of 0% -100%. The invention adopts the driving device meeting the requirements of the space detection field, realizes high integration design, and is also suitable for the driving signal isolation of other occasions and fields.
Drawings
FIG. 1 is a schematic topological diagram of a space wide-range duty-ratio adjustable transformer isolation driving method according to the present invention;
FIG. 2 is a control diagram of the driving signals in the present invention;
fig. 3 is a control logic simulation diagram of the transformer isolation driving method with adjustable space wide-range duty ratio in the invention.
Detailed Description
The features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of the non-limiting embodiments made with reference to fig. 1-3. The present invention will be described in more detail below with reference to fig. 1 to 3, which illustrate an embodiment of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1, in the transformer isolation driving method with adjustable duty ratio in wide space range provided by the present invention, two connected transformer isolation circuits are used to output a driving signal with 0% -100% duty ratio; wherein, every way transformer isolation circuit contains: the totem-pole circuit is used for enhancing the driving capability of an input driving signal; the pulse transformer is connected with the output end of the totem-pole circuit through a circuit and used for carrying out signal isolation on the driving signal with enhanced driving capability; the output end of the pulse transformer of the two-way transformer isolation circuit is connected in series with a first resistor R6 through a first triode Q3, and the output end of the pulse transformer of the two-way transformer isolation circuit is also connected to the gate and the source of a switching tube Q4 (implemented by a MOSFET) respectively.
As shown in fig. 1, the upper totem pole circuit of the upper transformer isolation circuit is formed by connecting a second resistor R1, a second triode Q1, a third triode Q2 and a third resistor R3 in series, the input end of the upper totem pole circuit is a base connected with the second triode Q1 and the third triode Q2, and the output end of the upper totem pole circuit is a collector connected with the second triode Q1 and the third triode Q2. The upper totem pole circuit enhances the driving capability of an upper driving signal PWM _ OUT1 input from the input end. The upper pulse transformer T1 of the upper transformer isolation circuit isolates the driving signal PWM _ OUT1 with enhanced driving capability.
Furthermore, the input end of the upper circuit pulse transformer T1 is connected with the output end of the upper circuit totem-pole circuit through a sixth resistor R3 and a first capacitor C1; the output end of the up pulse transformer T1 is connected to the first resistor R6 through the second capacitor C2, the seventh resistor R4 and the first diode D1, and is connected to the gate G of the switching tube Q4.
As shown in fig. 1, the lower totem pole circuit of the lower transformer isolation circuit is formed by connecting a fourth resistor R7, a fourth triode Q5, a fifth triode Q6 and a fifth resistor R8 in series, the input end of the lower totem pole circuit is a base connected with the fourth triode Q5 and the fifth triode Q6, and the output end of the lower totem pole circuit is a collector connected with the fourth triode Q5 and the fifth triode Q6. The lower totem-pole circuit enhances the driving capability of a lower driving signal PWM _ OUT2 input from the input end. The down pulse transformer T2 of the down transformer isolation circuit isolates the driving signal PWM _ OUT2 with enhanced driving capability.
Furthermore, the input end of the lower pulse transformer T2 is connected to the output end of the lower totem-pole circuit through an eighth resistor R9 and a third capacitor C3; the output end of the down pulse transformer T2 is connected to the first transistor Q3 through the fourth capacitor C4, the ninth resistor R10 and the second diode D3, and is connected to the source S of the switching tube Q4.
After the boost and isolation, the upper driving signal PWM _ OUT1 charges the GS terminal of the switching tube Q4, and after the boost and isolation, the lower driving signal PWM _ OUT2 discharges the GS terminal of the switching tube Q4. And the two paths of driving signals PWM _ OUT1 and PWM _ OUT2 are both driving signals with 50% duty ratio, so that the unsaturated condition of the pulse transformer can be fully ensured. Meanwhile, in an extreme case, when the upper driving signal PWM _ OUT1 is always on, the switching tube Q4 outputs a driving signal with 100% duty ratio; when the down-link driving signal PWM _ OUT2 is always on, the switching tube Q4 outputs a driving signal with 0% duty cycle.
As shown in fig. 1, a seventh resistor R4 connected between the output terminal of the on-line pulse transformer T1 and the first resistor R6 is a charging resistor for the GS terminal of the switching tube Q4; a first resistor R6 connected between the up pulse transformer T1 and the down pulse transformer T2 as a discharge resistor to the GS terminal of the switching tube Q4; the rising edge and the falling edge of the driving signal output by the switching tube Q4 can be controlled by controlling and adjusting the resistances of the seventh resistor R4 and the first resistor R6.
As shown in fig. 1, the first diode D1 connected between the output terminal of the on-line pulse transformer T1 and the first resistor R6 is used to ensure that no current backflow occurs during the charging process of the GS terminal of the switching transistor Q4.
As shown in fig. 2, in the preferred embodiment of the present invention, a logic nand chip CD4011 and a logic and chip CD4081 may be used to form a control system of driving signals, so as to generate two driving signals PWM _ OUT1 and PWM _ OUT 2.
The method specifically comprises the following steps: two initial driving signals are adopted, as shown in fig. 2 and fig. 3, one of the initial driving signals is a normal PWM signal PWM1, V7 in fig. 3 is the waveform of the initial driving signal PWM1, and the duty ratio is 0% to 100%; the other signal is PWM2, the switching frequency is higher than PWM1, and V8 in fig. 3 is the waveform of the initial driving signal PWM2, and the duty ratio is 50%. In more detail, the switching frequency of the initial driving signal PWM2 is 10 times or more the switching frequency of the initial driving signal PWM 1. The two initial driving signals are modulated in an and manner by the control system shown in fig. 2, so as to obtain the two driving signals PWM _ OUT1 (the waveform is shown as V5 in fig. 3) and PWM _ OUT2 (the waveform is shown as V6 in fig. 3).
In summary, the transformer isolation driving method with the adjustable duty ratio in the wide space range provided by the invention decomposes the driving signal on two transformer isolation circuits, wherein one circuit is responsible for charging the GS end of the switching tube, and the other circuit is responsible for discharging the GS end of the switching tube, so as to output the driving signal with the duty ratio of 0% -100%. The invention adopts the driving device meeting the requirements of the space detection field, realizes high integration design, and is also suitable for the driving signal isolation of other occasions and fields.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A space wide range duty ratio adjustable transformer isolation driving method is characterized in that a first path of transformer isolation circuit and a second path of transformer isolation circuit which are connected are adopted to output a driving signal with 0% -100% duty ratio; wherein,
each transformer isolation circuit comprises: the totem-pole circuit enhances the driving capability of the input driving signal; the pulse transformer is connected with the output end of the totem-pole circuit through a circuit and used for carrying out signal isolation on the driving signal with enhanced driving capability;
the output ends of the pulse transformers of the two transformer isolation circuits are connected in series through a first triode and a first resistor, and the output ends of the pulse transformers of the two transformer isolation circuits are also respectively connected to the grid electrode and the source electrode of the MOSFET.
2. The isolated driving method of the transformer with the adjustable space-wide duty ratio according to claim 1, wherein the gate-source terminal of the MOSFET is charged after the first driving signal inputted to the first isolated circuit of the transformer is enhanced and isolated; and discharging the gate-source end of the MOSFET of the switching tube after the second path of driving signal input into the second path of transformer isolation circuit is enhanced and isolated.
3. The isolated driving method of the transformer with the adjustable space-wide duty ratio according to claim 2, wherein the first path of driving signal and the second path of driving signal are both driving signals with 50% duty ratio; when the first path of driving signal is always conducted, the MOSFET of the switching tube outputs a driving signal with 100% duty ratio; when the second path of driving signal is always conducted, the MOSFET of the switching tube outputs a driving signal with 0% duty ratio.
4. The isolated driving method of the transformer with the adjustable space-wide duty ratio as claimed in claim 1, wherein a seventh resistor is further connected between the output end of the pulse transformer of the first path of transformer isolation circuit and the first resistor.
5. The isolated driving method of the transformer with the adjustable space-wide duty ratio according to claim 4, wherein the seventh resistor is a charging resistor for the gate source terminal of the MOSFET; the first resistor is a discharge resistor for the gate source end of the MOSFET of the switching tube; the rising edge and the falling edge of the driving signal output by the switching tube MOSFET are controlled by controlling the seventh resistor and the first resistor.
6. The isolated driving method of claim 1, wherein a first diode is further connected between the output terminal of the pulse transformer of the first path of transformer isolation circuit and the first resistor, and the first diode prevents current from flowing back during the process of charging the gate source terminal of the MOSFET.
7. The isolated driving method of the transformer with the adjustable space-wide-range duty ratio according to claim 1, characterized in that a first PWM initial driving signal and a second PWM initial driving signal with a switching frequency higher than that of the first PWM initial driving signal are adopted and modulated in an AND manner to obtain the first driving signal and the second driving signal.
8. The isolated driving method of transformer with adjustable duty ratio in wide space as claimed in claim 7, wherein the switching frequency of the second PWM initial driving signal is 10 times or more of the switching frequency of the first PWM initial driving signal.
9. The isolated driving method of the transformer with the adjustable space wide-range duty ratio according to claim 7, wherein the duty ratio of the first PWM initial driving signal is 0% -100%, and the duty ratio of the second PWM initial driving signal is 50%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810487016.8A CN108649932A (en) | 2018-05-21 | 2018-05-21 | The adjustable transformer isolation driving method of space wide scope duty ratio |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810487016.8A CN108649932A (en) | 2018-05-21 | 2018-05-21 | The adjustable transformer isolation driving method of space wide scope duty ratio |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299826A (en) * | 2019-07-01 | 2019-10-01 | 上海空间电源研究所 | A kind of spacecraft highly reliable isolated drive circuit of suitable wide duty ratio |
| CN110474539A (en) * | 2019-08-23 | 2019-11-19 | 佛山市格正电源科技有限公司 | A kind of novel isolated drive circuit |
| CN111130344A (en) * | 2019-12-18 | 2020-05-08 | 上海空间电源研究所 | Space microsecond level pulse power supply circuit |
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| US6411064B1 (en) * | 2000-07-20 | 2002-06-25 | Koninklijke Philips Electronics N.V. | System and method for charging a capacitor using a variable frequency, variable duty cycle current waveform |
| CN203445775U (en) * | 2013-08-28 | 2014-02-19 | 北京卫星制造厂 | Large-duty-ratio magnetic isolation drive circuit |
| CN104348398A (en) * | 2014-10-29 | 2015-02-11 | 华南农业大学 | Drive control device and method of macro-micro drive piezoelectric liner motor |
| CN104467380A (en) * | 2014-12-31 | 2015-03-25 | 广州视源电子科技股份有限公司 | Driving device and method |
| CN204886740U (en) * | 2015-08-28 | 2015-12-16 | 山东艾诺仪器有限公司 | Hard switch drive circuit of full -bridge contravariant |
-
2018
- 2018-05-21 CN CN201810487016.8A patent/CN108649932A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411064B1 (en) * | 2000-07-20 | 2002-06-25 | Koninklijke Philips Electronics N.V. | System and method for charging a capacitor using a variable frequency, variable duty cycle current waveform |
| CN203445775U (en) * | 2013-08-28 | 2014-02-19 | 北京卫星制造厂 | Large-duty-ratio magnetic isolation drive circuit |
| CN104348398A (en) * | 2014-10-29 | 2015-02-11 | 华南农业大学 | Drive control device and method of macro-micro drive piezoelectric liner motor |
| CN104467380A (en) * | 2014-12-31 | 2015-03-25 | 广州视源电子科技股份有限公司 | Driving device and method |
| CN204886740U (en) * | 2015-08-28 | 2015-12-16 | 山东艾诺仪器有限公司 | Hard switch drive circuit of full -bridge contravariant |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299826A (en) * | 2019-07-01 | 2019-10-01 | 上海空间电源研究所 | A kind of spacecraft highly reliable isolated drive circuit of suitable wide duty ratio |
| CN110299826B (en) * | 2019-07-01 | 2020-11-20 | 上海空间电源研究所 | Reliable isolation driving circuit suitable for wide duty ratio for spacecraft |
| CN110474539A (en) * | 2019-08-23 | 2019-11-19 | 佛山市格正电源科技有限公司 | A kind of novel isolated drive circuit |
| CN111130344A (en) * | 2019-12-18 | 2020-05-08 | 上海空间电源研究所 | Space microsecond level pulse power supply circuit |
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