CN111371294B - Frequency spectrum shifting MOS drive circuit and method based on digital amplitude modulation technology - Google Patents
Frequency spectrum shifting MOS drive circuit and method based on digital amplitude modulation technology Download PDFInfo
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- CN111371294B CN111371294B CN202010260029.9A CN202010260029A CN111371294B CN 111371294 B CN111371294 B CN 111371294B CN 202010260029 A CN202010260029 A CN 202010260029A CN 111371294 B CN111371294 B CN 111371294B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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Abstract
The invention discloses a frequency spectrum shifting MOS (metal oxide semiconductor) driving circuit and method based on a digital amplitude modulation technology, which relate to the field of switching power supply driving and comprise a modulation module, a high-frequency transformer, a demodulation module and a switching module. Through the mode of loading input signal on the frequency multiplication signal, the purpose that the input signal frequency spectrum moves to the high-frequency band has been realized to reduced the demand to coupling transformer coil, reduced the holistic volume that occupies of switching power supply, utilize rectifier module simultaneously, make no matter the input signal input be high level or low level, can both keep the input of switch module input be high level, guarantee that switch module does not lead to the change of conducting state because of the transform of input signal level.
Description
Technical Field
The invention relates to the field of switching power supply driving, in particular to a frequency spectrum shifting MOS driving circuit and a frequency spectrum shifting MOS driving method based on a digital amplitude modulation technology.
Background
The servo driver is an important component in modern motion control, and is widely applied to automation equipment such as industrial robots and numerical control machining centers, and with the progress of science and technology, people have higher and higher requirements on the servo driver. Due to the characteristics of high power and high frequency of the servo driver, the conventional coupling switching power supply usually needs a large coupling transformer to realize the transmission of the driving signal. This undoubtedly causes the servo driver switching device to occupy a very large space, is also very difficult for the later maintenance of the coupling transformer, and is not fast enough for the response of the switching signal, easily causing a safety accident.
In the prior art, for example, chinese patent publication No. CN109417351A discloses a switching power supply for a servo driver and a servo driver, which provide a multi-path dc power supply with different voltages and a better regulation rate for the servo driver and reduce electromagnetic interference through the switching power supply, but do not solve the problem of large volume occupation of the switching power supply.
Disclosure of Invention
In order to reduce the volume of a coupling transformer in a switching power supply of a servo driver and further reduce the whole volume of the switching power supply, the invention provides a frequency spectrum shifting MOS driving circuit based on a digital amplitude modulation technology, which comprises a modulation module, a high-frequency transformer, a demodulation module and a switching module, wherein:
the modulation module is used for moving the frequency spectrum of the input signal to a frequency multiplication signal to obtain a high-frequency signal after receiving the input signal, and transmitting the high-frequency signal to the front stage of the high-frequency transformer through the output end;
the high-frequency transformer is used for coupling the high-frequency signal to the rear stage of the high-frequency transformer;
the demodulation module is used for demodulating an input signal in the high-frequency signal to obtain an output signal and transmitting the output signal to the switch module through an output end;
and the switch module is used for switching on when the received output signal is at a high level and switching off when the received output signal is empty.
Further, the modulation module comprises a first trigger chip having a first pin to a fifth pin, wherein:
the first pin is vacant; the second pin is grounded through a second capacitor; the third pin is grounded; the fourth pin is simultaneously connected with one end of a fourth resistor, one end of a seventh resistor and a grid electrode of a fourth MOS (metal oxide semiconductor) tube, the other end of the fourth resistor is connected with the second pin, the other end of the seventh resistor is grounded, a source electrode of the fourth MOS tube is simultaneously grounded and a cathode of a fifth voltage stabilizing diode, a drain electrode of the fourth MOS tube is used as an output end of the modulation module, and an anode of the fifth voltage stabilizing diode is connected with a drain electrode of the fourth MOS tube; the fifth pin is grounded through a third capacitor, and meanwhile, serves as a driving signal input end through a fifth resistor.
Further, the high frequency transformer includes first to fourth pins, wherein:
the first pin is used as a high-frequency signal input end and connected with the output end of the modulation module; the second pin is connected with a positive power supply; the third pin and the fourth pin correspond to the second pin and the first pin respectively.
Further, the demodulation module includes a first diode to a third diode connected in series, the diode connected in series is composed of two diodes with positive and negative electrodes connected in series, and includes an input end, an output end and a series end, wherein:
the input end of the first series diode is connected with a fourth pin of the high-frequency transformer, the output end of the first series diode is connected with one end of a first resistor, and the other end of the first resistor is simultaneously connected with an emitter of a second triode and a collector of a third triode and serves as the output end of the demodulation module;
the series end of the second series diode is connected with a third pin of the high-frequency transformer, the output end of the second series diode is simultaneously connected with the series end of the first series diode, one end of the second resistor and the base electrode of the second triode, and the input end of the second series diode is connected with the other end of the second resistor, the collector electrode of the second triode and the base electrode of the third triode;
the output end of the third series diode is connected with a fourth pin of the high-frequency transformer, the series section is connected with the input end of the second series diode, the input end of the third series diode is simultaneously connected with the emitting electrode of the third triode and one end of the first capacitor, and the other end of the first capacitor is grounded.
Further, the switch module includes a first MOS transistor, wherein:
the drain electrode of the first MOS tube is connected with a forward direct-current power supply, the grid electrode of the first MOS tube is simultaneously connected with one end of a third resistor and the anode of a fourth voltage-stabilizing diode, the cathode of the fourth voltage-stabilizing diode, the other end of the third resistor and the source electrode of the first MOS tube are communicated with a first capacitor and are grounded, and meanwhile, the source electrode serves as the output end of the switch module.
Further, the input signal is at a high level and a low level, and the method is characterized in that:
when the input signal is at a high level in the high-low level switching process, the fourth MOS tube is conducted, a high-frequency signal is output by a third pin of the high-frequency transformer at the moment, the output signal output by the demodulation module is at a high level, and the switch module is conducted;
when the input signal is at a low level in the high-low level switching process, the fourth MOS tube is disconnected, a high-frequency signal is output by a fourth pin of the high-frequency transformer at the moment, the output signal output by the demodulation module is at a high level, and the switch module is switched on;
when the input signal is continuously at a low level, the fourth MOS tube is continuously turned off, the operation of the high-frequency transformer is stopped at the moment, and the switch module stops outputting.
Further, the high frequency signal is a digital amplitude modulated signal, wherein:
when the input signal is at a high level in the high-low level switching process, the frequency and amplitude of the high-frequency signal output by the modulation module and the high-frequency transformer are kept consistent with those of the frequency doubling signal;
when the input signal is at low level in the high-low level switching process, the high-frequency signals output by the modulation module and the high-frequency transformer are both at low level.
The invention also provides a frequency spectrum shifting MOS driving method based on the digital amplitude modulation technology, which comprises a modulation module, a high-frequency transformer, a demodulation module and a switch module, and comprises the following steps:
s1: sending an input signal to a modulation module, and moving the frequency spectrum of the input signal to a frequency multiplication signal through the modulation module to obtain a high-frequency signal;
s2: coupling the high-frequency signal to a demodulation module through a high-frequency transformer;
s3: demodulating an input signal in the high-frequency signal through a demodulation module to obtain an output signal;
s4: and controlling the switch module according to the output signal, controlling the switch module to be switched on when the output signal is at a high level, and controlling the switch module to be switched off when the output signal is empty.
Further, the input signal is at a high-low level, wherein:
when the input signal is switched between high and low levels, the output signals of the demodulation module are all high levels; when the input signal is continuously at low level, the output signal of the demodulation module is null.
Further, the high frequency signal is a digital amplitude modulated signal, wherein:
when the input signal is at a high level in the high-low level switching process, the frequency and amplitude of the high-frequency signal output by the modulation module and the high-frequency transformer are kept consistent with those of the frequency doubling signal;
when the input signal is at low level in the high-low level switching process, the high-frequency signals output by the modulation module and the high-frequency transformer are both at low level.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) according to the frequency spectrum shifting MOS driving circuit and method based on the digital amplitude modulation technology, the input signal is loaded on the frequency multiplication signal, so that the high-frequency band of the frequency spectrum of the input signal is moved, the requirement on a coupling transformer coil is reduced, and the overall occupied volume of a switching power supply is reduced;
(2) the input signal is loaded on the frequency multiplication signal, so that the delay of the driving signal is lower, and the design cost is reduced;
(3) meanwhile, the rectification module is utilized, so that whether the input signal is high level or low level, the input of the input end of the switch module can be kept high level, and the switch module is ensured not to be changed in a conduction state due to the conversion of the input signal level.
Drawings
FIG. 1 is a schematic circuit diagram of a frequency-shifting MOS driving circuit based on digital amplitude modulation technique;
FIG. 2 is a block diagram of a method for shifting a frequency spectrum MOS driver circuit based on digital amplitude modulation;
FIG. 3 is a schematic circuit diagram of a modulation module;
FIG. 4 is a schematic diagram of a high frequency transformer;
FIG. 5 is a schematic circuit diagram of a demodulation module;
FIG. 6 is a schematic circuit diagram of a switch module;
FIG. 7 is a method step diagram of a method for driving a frequency-shifting MOS based on digital amplitude modulation.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
In order to reduce the volume of a coupling transformer in a switching power supply of a servo driver and further reduce the overall volume of the switching power supply, the invention provides a frequency spectrum shifting MOS driving circuit based on a digital amplitude modulation technology, as shown in fig. 1 and 2, comprising a modulation module, a high-frequency transformer, a demodulation module and a switching module, wherein:
the modulation module is used for moving the frequency spectrum of the input signal to a frequency multiplication signal to obtain a high-frequency signal after receiving the input signal, and transmitting the high-frequency signal to the front stage of the high-frequency transformer through the output end;
the high-frequency transformer is used for coupling the high-frequency signal to the rear stage of the high-frequency transformer;
the demodulation module is used for demodulating an input signal in the high-frequency signal to obtain an output signal and transmitting the output signal to the switch module through an output end;
and the switch module is used for switching on when the received output signal is at a high level and switching off when the received output signal is empty.
As shown in fig. 3, the modulation module includes a first trigger chip U1, which includes a first pin to a fifth pin, where:
the first pin is vacant; the second pin is grounded through a second capacitor; the third pin is grounded; the fourth pin is simultaneously connected with one end of a fourth resistor, one end of a seventh resistor and a grid electrode of a fourth MOS (metal oxide semiconductor) tube, the other end of the fourth resistor is connected with the second pin, the other end of the seventh resistor is grounded, a source electrode of the fourth MOS tube is simultaneously grounded and a cathode of a fifth voltage stabilizing diode, a drain electrode of the fourth MOS tube is used as an output end of the modulation module, and an anode of the fifth voltage stabilizing diode is connected with a drain electrode of the fourth MOS tube; the fifth pin is grounded through a third capacitor, and meanwhile, serves as a driving signal input end through a fifth resistor.
In the embodiment, the first trigger is a schmitt trigger, the model of which is TC4S584F, a driving signal is introduced through a fifth pin of the first trigger, and an original input signal is modulated onto a frequency doubling signal through an external fourth resistor R4 and a second capacitor C2, and the frequency of the obtained high-frequency signal is kept consistent with the amplitude of the frequency doubling signal to be a high-frequency high-amplitude signal, so that the response speed of the high-frequency transformer is increased, and the turn-on and turn-off delay is further improved.
Further, as shown in fig. 4, the high frequency transformer includes a first pin to a fourth pin, wherein:
the first pin is used as a high-frequency signal input end and connected with the output end of the modulation module; the second pin is connected with a positive power supply; the third pin and the fourth pin correspond to the second pin and the first pin respectively.
Further, the demodulation module includes a first diode to a third diode connected in series, the diode connected in series is composed of two diodes with positive and negative electrodes connected in series, and includes an input end, an output end and a series end, wherein:
the input end of the first series diode is connected with a fourth pin of the high-frequency transformer, the output end of the first series diode is connected with one end of a first resistor, and the other end of the first resistor is simultaneously connected with an emitter of a second triode and a collector of a third triode and serves as the output end of the demodulation module;
the series end of the second series diode is connected with a third pin of the high-frequency transformer, the output end of the second series diode is simultaneously connected with the series end of the first series diode, one end of the second resistor and the base electrode of the second triode, and the input end of the second series diode is connected with the other end of the second resistor, the collector electrode of the second triode and the base electrode of the third triode;
the output end of the third series diode is connected with a fourth pin of the high-frequency transformer, the series section is connected with the input end of the second series diode, the input end of the third series diode is simultaneously connected with the emitting electrode of the third triode and one end of the first capacitor, and the other end of the first capacitor is grounded.
Under the action of the demodulation module, when an input signal is at a high level in a high-low level switching process, a fourth MOS tube in the modulation module is conducted, so that a first pin and a second pin of the high-frequency transformer are conducted (the voltage of the first pin is higher than that of the second pin), at the moment, the high-frequency signal is coupled to the rear stage of the high-frequency transformer, the high-frequency signal is output by a third pin, the high-frequency signal is rectified by a second series diode, a first series diode and a plurality of triodes, an output signal is demodulated, and at the moment, the output signal is consistent with the input signal, so that the high level is ensured to be output to the switch module;
when the input signal is at a low level in the high-low level switching process, the fourth MOS tube in the modulation module is not conducted, and due to the characteristic of the transformer coupling coil (the voltage of the second pin is higher than that of the first pin), the high-frequency transformer still outputs a high-frequency signal to the rear stage, but at the moment, the high-frequency signal is output by the fourth pin and is rectified by the first series diode and the triodes to demodulate an output signal (still at a high level), so that the demodulation module still outputs the high level to the switch module when the input signal is at the low level;
when the input signal is continuously at a low level, the fourth MOS tube in the modulation module is continuously turned off, at the moment, the operation of the high-frequency transformer is stopped, and the switch module also stops outputting.
Wherein the high frequency signal is a digital amplitude modulated signal, wherein:
when the input signal is at a high level in the high-low level switching process, the frequency and amplitude of the high-frequency signal output by the modulation module and the high-frequency transformer are kept consistent with those of the frequency doubling signal;
when the input signal is at low level in the high-low level switching process, the high-frequency signals output by the modulation module and the high-frequency transformer are both at low level.
Therefore, through the module, continuity of the conduction state of the first MOS tube in the switch module can be guaranteed in the continuous input stage of the input signal, and meanwhile, the module can respond in time after the input signal stops being input and quickly turns off the first MOS tube.
Further, the switch module includes a first MOS transistor, wherein:
the drain electrode of the first MOS tube is connected with a forward direct-current power supply, the grid electrode of the first MOS tube is simultaneously connected with one end of a third resistor and the anode of a fourth voltage-stabilizing diode, the cathode of the fourth voltage-stabilizing diode, the other end of the third resistor and the source electrode of the first MOS tube are communicated with a first capacitor and are grounded, and meanwhile, the source electrode serves as the output end of the switch module.
According to the frequency spectrum shifting MOS drive circuit based on the digital amplitude modulation technology, the input signal is loaded on the frequency multiplication signal, so that the high-frequency band shifting of the frequency spectrum of the input signal is realized, the requirement on a coupling transformer coil is reduced, and the overall occupied volume of a switching power supply is reduced; the input signal is loaded on the frequency multiplication signal, so that the delay of the driving signal is lower, and the design cost is reduced; meanwhile, the rectification module is utilized, so that whether the input signal is high level or low level, the input of the input end of the switch module can be kept high level, and the switch module is ensured not to be changed in a conduction state due to the conversion of the input signal level.
Example two
In order to better illustrate the present invention and make the overall steps related to the technical points of the present invention have a clearer concept, the present embodiment describes the present invention by the situation of the method steps, as shown in fig. 7, a method for driving a spectrum shifting MOS based on a digital amplitude modulation technique, which includes a modulation module, a high-frequency transformer, a demodulation module and a switch module, and includes the steps of:
s1: sending an input signal to a modulation module, and moving the frequency spectrum of the input signal to a frequency multiplication signal through the modulation module to obtain a high-frequency signal;
s2: coupling the high-frequency signal to a demodulation module through a high-frequency transformer;
s3: demodulating an input signal in the high-frequency signal through a demodulation module to obtain an output signal;
s4: and controlling the switch module according to the output signal, controlling the switch module to be switched on when the output signal is at a high level, and controlling the switch module to be switched off when the output signal is empty.
Wherein, the input signal is at high and low levels:
when the input signal is switched between high and low levels, the output signals of the demodulation module are all high levels; when the input signal is continuously at low level, the output signal of the demodulation module is null.
Further, the high frequency signal is a digital amplitude modulated signal, wherein:
when the input signal is at a high level in the high-low level switching process, the frequency and amplitude of the high-frequency signal output by the modulation module and the high-frequency transformer are kept consistent with those of the frequency doubling signal;
when the input signal is at low level in the high-low level switching process, the high-frequency signals output by the modulation module and the high-frequency transformer are both at low level.
According to the MOS driving circuit and the method for shifting the frequency spectrum based on the digital amplitude modulation technology, disclosed by the invention, the high-frequency band shifting of the frequency spectrum of the input signal is realized by loading the input signal on the frequency-doubled signal, so that the requirement on a coupling transformer coil is reduced, and the integral occupied volume of a switching power supply is reduced; the input signal is loaded on the frequency multiplication signal, so that the delay of the driving signal is lower, and the design cost is reduced; meanwhile, the rectification module is utilized, so that whether the input signal is high level or low level, the input of the input end of the switch module can be kept high level, and the switch module is ensured not to be changed in a conduction state due to the conversion of the input signal level.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. A frequency spectrum shifting MOS drive circuit based on a digital amplitude modulation technology is characterized by comprising a modulation module, a high-frequency transformer, a demodulation module and a switch module, wherein:
the modulation module is used for moving the frequency spectrum of the input signal to a frequency multiplication signal to obtain a high-frequency signal after receiving the input signal, and transmitting the high-frequency signal to the front stage of the high-frequency transformer through the output end;
the high-frequency transformer is used for coupling the high-frequency signal to the rear stage of the high-frequency transformer;
the demodulation module is used for demodulating an input signal in the high-frequency signal to obtain an output signal and transmitting the output signal to the switch module through an output end;
the switch module is used for switching on when the received output signal is at a high level and switching off when the received output signal is empty;
the demodulation module comprises a first series diode and a third series diode, the series diode is composed of two diodes with positive and negative electrodes connected in series, and the demodulation module comprises an input end, an output end and a series end, wherein:
the input end of the first series diode is connected with a fourth pin of the high-frequency transformer, the output end of the first series diode is connected with one end of a first resistor, and the other end of the first resistor is simultaneously connected with an emitter of a second triode and a collector of a third triode and serves as the output end of the demodulation module;
the series end of the second series diode is connected with a third pin of the high-frequency transformer, the output end of the second series diode is simultaneously connected with the series end of the first series diode, one end of the second resistor and the base electrode of the second triode, and the input end of the second series diode is connected with the other end of the second resistor, the collector electrode of the second triode and the base electrode of the third triode;
the output end of the third series diode is connected with a fourth pin of the high-frequency transformer, the series section is connected with the input end of the second series diode, the input end of the third series diode is simultaneously connected with the emitting electrode of the third triode and one end of the first capacitor, and the other end of the first capacitor is grounded.
2. The MOS driver circuit for shifting frequency spectrum based on digital amplitude modulation technology as claimed in claim 1, wherein the modulation module comprises a first trigger chip having a first pin to a fifth pin, wherein:
the first pin is vacant; the second pin is grounded through a second capacitor; the third pin is grounded; the fourth pin is simultaneously connected with one end of a fourth resistor, one end of a seventh resistor and a grid electrode of a fourth MOS (metal oxide semiconductor) tube, the other end of the fourth resistor is connected with the second pin, the other end of the seventh resistor is grounded, a source electrode of the fourth MOS tube is simultaneously grounded and a cathode of a fifth voltage stabilizing diode, a drain electrode of the fourth MOS tube is used as an output end of the modulation module, and an anode of the fifth voltage stabilizing diode is connected with a drain electrode of the fourth MOS tube; the fifth pin is grounded through a third capacitor, and meanwhile, serves as a driving signal input end through a fifth resistor.
3. The MOS driver circuit for shifting spectrum based on digital amplitude modulation technique according to claim 1, wherein the high frequency transformer comprises a first pin to a fourth pin, wherein:
the first pin is used as a high-frequency signal input end and connected with the output end of the modulation module; the second pin is connected with a positive power supply; the third pin and the fourth pin correspond to the second pin and the first pin respectively.
4. The MOS driver circuit for shifting spectrum based on digital amplitude modulation technique as claimed in claim 1, wherein the switch module comprises a first MOS transistor, wherein:
the drain electrode of the first MOS tube is connected with a forward direct-current power supply, the grid electrode of the first MOS tube is simultaneously connected with one end of a third resistor and the anode of a fourth voltage-stabilizing diode, the cathode of the fourth voltage-stabilizing diode, the other end of the third resistor and the source electrode of the first MOS tube are communicated with a first capacitor and are grounded, and meanwhile, the source electrode serves as the output end of the switch module.
5. The MOS driver circuit for shifting frequency spectrum based on digital amplitude modulation technique as claimed in any of claims 1 to 4, wherein the input signal is at high and low levels, characterized in that:
when the input signal is at a high level in the high-low level switching process, the fourth MOS tube is conducted, a high-frequency signal is output by a third pin of the high-frequency transformer at the moment, the output signal output by the demodulation module is at a high level, and the switch module is conducted;
when the input signal is at a low level in the high-low level switching process, the fourth MOS tube is disconnected, a high-frequency signal is output by a fourth pin of the high-frequency transformer at the moment, the output signal output by the demodulation module is at a high level, and the switch module is switched on;
when the input signal is continuously at a low level, the fourth MOS tube is continuously turned off, the operation of the high-frequency transformer is stopped at the moment, and the switch module stops outputting.
6. The MOS driving circuit for shifting frequency spectrum based on digital amplitude modulation technique as claimed in claim 5, wherein the high frequency signal is a digital amplitude modulation signal, wherein:
when the input signal is at a high level in the high-low level switching process, the frequency and amplitude of the high-frequency signal output by the modulation module and the high-frequency transformer are kept consistent with those of the frequency doubling signal;
when the input signal is at low level in the high-low level switching process, the high-frequency signals output by the modulation module and the high-frequency transformer are both at low level.
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| CN206977572U (en) * | 2017-07-13 | 2018-02-06 | 重庆工业职业技术学院 | A kind of digital media information processing unit |
| CN208239552U (en) * | 2018-06-05 | 2018-12-14 | 南京普肯传感科技有限公司 | A kind of closed-loop type DC leakage current sensor electronics |
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| CN111371294A (en) | 2020-07-03 |
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