CN116260439A - Output stage driving circuit capable of reducing interference and control method - Google Patents
Output stage driving circuit capable of reducing interference and control method Download PDFInfo
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- 230000005670 electromagnetic radiation Effects 0.000 abstract description 12
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
-
- 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
- H02M1/0029—Circuits or arrangements for limiting the slope of switching signals, e.g. slew rate
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0054—Gating switches, e.g. pass gates
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to an output stage driving circuit for reducing interference and a control method thereof, comprising a frequency spectrum spread modulation module, an active edge control module and a power tube; the voltage signal is input to the frequency spectrum spread modulation module, and a pulse width modulation signal with the duty ratio being in direct proportion to the amplitude of the voltage signal is generated after modulation; the pulse width modulation signal is input into the active edge control module and drives the active edge control module to generate a grid control signal, and the grid control signal controls the on and off of the power tube. According to the invention, the frequency spectrum expansion modulation module is arranged, the input voltage signal is modulated by using the modulation frequency signal, a pulse width modulation signal with a duty ratio in direct proportion to the amplitude of the voltage signal is generated, the noise frequency spectrum energy on each frequency is averaged, the obvious electromagnetic radiation energy peak value is eliminated, and the interference of the electromagnetic radiation on the switching frequency to other circuits or modules is reduced from the source.
Description
Technical Field
The present invention relates to the field of power tube driving technologies, and in particular, to an output stage driving circuit for reducing interference and a control method thereof.
Background
In an electronic system, in order to improve output driving capability, on-resistance of a power tube is as small as possible, so that loss of the power tube during on is low and conversion efficiency is higher. However, the conversion efficiency is not only related to the conduction loss of the power tube, but also to the switching loss of the power tube between on and off. In order to further improve the conversion efficiency, it is also necessary to reduce the switching loss, but the reduction of the switching loss causes interference. In order to solve the interference problem, the power tube needs to be firstly analyzed in the opening and closing process.
The power tube opening process needs to go through four intervals:
T 1 zone: 0V to V th Region of gate-source voltage V of power tube in the region gs Rise from 0V to turn-on threshold V th The interval power tube is not conducted, and the drain voltage V of the power tube ds Not pulled down, drain current I ds Zero.
T 2 Zone: v (V) th ~V th +V od The interval power tube is switched from the off state to the on state, and the power tube conducts current I ds Rapidly rise to drain voltage V ds And is kept unchanged, and the interval is a di/dt area.
T 3 Zone: v (V) th +V od Flat region, gate-source voltage V of power tube in the region gs And on-current I ds The drain voltage V of the power tube is kept unchanged ds Rapidly decreasing, the interval is dv/dt.
T 4 Zone: v (V) th +V od VDD region, V of power tube in the region gs The voltage continues to increase to the supply voltage VDD and the power transistor on-resistance decreases to a stable minimum.
The power tube turn-off process also needs to go through four intervals:
T 5 zone: VDD-V th +V od Zone of power tube V gs Voltage decrease from VDD to effective gate drive voltage V th +V od The on-resistance of the power tube becomes gradually larger.
T 6 Zone: v (V) th +V od A flat region for conducting current I of the power tube ds Unchanged, drain voltage V ds Ascending, the interval is
A zone.
T 7 Zone: v (V) th +V od ~V th A region in which the power tube is switched from the on state to the off state, and the power tube conducts current I ds Rapidly decreasing, the interval being the di/dt region.
T 8 Zone: v (V) th 0V region, in which the power tube is in a closed state, V of the power tube gs Voltage from V th And the voltage is reduced to 0V, and the shutdown process is finished.
In the prior art, the charge and discharge current I output by the driving circuit is generally increased g To reduce switching losses. At T however 2 Region and T 7 In the region, the current of the power tube is changed if the charge-discharge current I output by the driving circuit g Too large will result in a T 2 And T 7 The current change slope of the region becomes larger, parasitic parameters of the power tube are added, and the output current I of the power tube ds Will be at T 2 And T 7 After the region is finished, a large ringing current is generated, so that electromagnetic interference and large fluctuation of the ground wire are generated, and normal operation of other modules connected with the same ground wire is influenced.
In addition, the switching process of the power tube is controlled by a clock signal, the switching signal output by the power tube comprises fundamental frequency components and odd harmonic component energy of the clock signal, noise spectrum density at the fundamental frequency and the odd harmonic is a narrow and high peak, and electromagnetic interference is easy to generate. In the prior art, such electromagnetic interference is generally solved by grounding, shielding, filtering and other modes, but the problems are solved from the perspective of reducing the generated electromagnetic interference signals, the electromagnetic interference signals are not reduced from the source, the solving method is complex, and the effect is limited.
Disclosure of Invention
The invention aims to provide an output stage driving circuit and a control method for reducing interference, which are used for reducing the switching loss of a power tube and reducing electromagnetic interference and large fluctuation of a ground wire generated by the power tube.
In order to solve the above technical problems, the present invention provides an output stage driving circuit for reducing interference, comprising: the device comprises a spectrum spread modulation module, an active edge control module and a power tube;
the spectrum spread modulation module, the active edge control module and the power tube are connected in sequence;
the voltage signal is input to the spectrum spreading modulation module, and a pulse width modulation signal with the duty ratio being in direct proportion to the amplitude of the voltage signal is generated after the modulation of the spectrum spreading modulation module; the pulse width modulation signal is input to the active edge control module to generate a grid control signal, and the grid control signal controls the on and off of the power tube.
Further, the spectrum spreading modulation module comprises a spectrum spreading ramp generator and a pulse width modulation comparator;
the voltage signal is connected to the positive electrode of the pulse width modulation comparator; the spectrum expansion slope generator outputs a triangular wave signal to the cathode of the pulse width modulation comparator; after the voltage signal is compared with the triangular wave signal, the output end of the pulse width modulation comparator outputs the pulse width modulation signal.
Further, the frequency of the triangular wave signal is 280 kHz-360 kHz.
Further, the active edge control module comprises a signal processing module, a power tube starting weak driving module, a first driving signal level detection module and a power tube starting driving reinforcing module.
The signal processing module converts the pulse width modulation signal into a power tube starting control signal and then inputs the power tube starting control signal to the input end of the power tube starting weak driving module and the first input end of the first driving signal level detection module, and the power tube starting weak driving module outputs a first grid driving signal to drive the power tube;
the first grid driving signal is input to a second input end of the first driving signal level detection module; when the power tube starting control signal is at a high level and the voltage value of the first grid driving signal reaches an effective grid driving voltage; the output end of the first driving signal level detection module outputs a high-level start driving reinforcing signal to the input end of the power tube start driving reinforcing module, the start driving reinforcing signal enables the power tube start driving reinforcing module, and the output end of the power tube start driving reinforcing module outputs a second grid driving signal;
and after the first grid driving signal and the second grid driving signal are overlapped, the power tube is driven together.
Further, the active edge control module further comprises a power tube closing weak driving module, a second driving signal level detection module and a power tube closing driving reinforcing module;
the signal processing module converts the pulse width modulation signal into a power tube closing control signal and then inputs the power tube closing control signal to the input end of the power tube closing weak driving module and the first input end of the second driving signal level detection module; the power tube closing weak driving module outputs a third grid driving signal;
the output end of the power tube closing drive reinforcing module outputs a fourth grid drive signal;
the third grid driving signal and the fourth grid driving signal are output and overlapped, and the power tube is closed together;
when the power tube closing control signal is in a high level and the voltage value of the grid driving signal is reduced to an effective grid driving voltage; and the output end of the second driving signal level detection module outputs a low-level closing driving reinforcing signal to the input end of the power tube closing driving reinforcing module, and the closing driving reinforcing signal closes the power tube closing driving reinforcing module.
Further, the signal processing module is a grid driving signal non-overlapping processing module;
the grid driving signal non-overlapping processing module converts the pulse width modulation signal into the two-phase non-overlapping power tube opening control signal and the power tube closing control signal.
The invention also provides an output stage driving control method for reducing interference, which adopts the output stage driving circuit for reducing interference, and comprises the following steps:
the frequency spectrum spread modulation module modulates the voltage signal to generate the pulse width modulation signal with the duty ratio proportional to the amplitude of the voltage signal;
the pulse width modulation signal drives the active edge control module to generate different grid control signals in different working intervals of the power tube;
the grid driving signal controls the on and off of the power tube.
Further, the spectrum spreading ramp generator outputs the triangular wave signal to the negative electrode of the pulse width modulation comparator, the voltage signal is input to the positive electrode of the pulse width modulation comparator, the voltage signal is compared with the triangular wave signal, and the pulse width modulation signal with the duty ratio proportional to the amplitude of the voltage signal is generated at the output end of the pulse width modulation comparator.
Further, the grid driving signal non-overlapping processing module converts the pulse width modulation signal into a power tube starting control signal;
in the power tube starting control process, after the power tube starting control signal passes through the power tube starting weak driving module, the power tube starting weak driving module outputs the first grid driving signal;
when the power tube starting control signal is in a high level and the voltage value of the first grid driving signal reaches an effective grid driving voltage, the power tube driving strengthening module is enabled by the starting driving strengthening signal after the starting driving strengthening signal is output by the output end of the first driving signal level detection module; and the power tube starting drive reinforcing module outputs a second grid drive signal, and is overlapped with the first grid drive signal to jointly conduct the power tube.
Further, the grid driving signal non-overlapping processing module converts the pulse width modulation signal into a power tube closing control signal;
in the power tube closing control process, the power tube closing control signal generates a third grid driving signal after passing through the power tube closing weak driving module; meanwhile, the power tube closing drive reinforcing module generates a fourth grid drive signal; the third grid driving signal and the fourth grid driving signal are overlapped to jointly close the power tube;
the second driving signal level detection module detects a grid driving signal, and when the power tube closing control signal is in a high level and the voltage value of the grid driving signal is reduced to an effective grid driving voltage; and the output end of the second driving signal level detection module generates a closing driving reinforcing signal, and the closing driving reinforcing signal closes the power tube closing driving reinforcing module.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the invention, by arranging the spectrum spreading modulation module, the input voltage signal is modulated by using the triangular wave signal with 280-360 kHz, a pulse width modulation signal with the same frequency of 280-360 kHz and in direct proportion to the amplitude of the voltage signal is generated, the noise spectrum energy on each frequency is averaged, the obvious electromagnetic radiation energy peak value is eliminated, and the interference of electromagnetic radiation on the switching frequency on other circuits or modules is reduced from the source.
Furthermore, the invention classifies the charge and discharge current of the grid electrode of the power tube and generates T of ringing current easily 2 And T 7 The interval reduces the change slope di/dt of the charge-discharge current and reduces the ringing voltage on the drain terminal voltage and the ground wire of the power tube, thereby reducing electromagnetic interference. And at T 3 And T 6 During the interval, the power tube opening driving reinforcing module and the power tube closing driving reinforcing module increase the charge and discharge current for driving the grid electrode of the power tube, shorten the rising edge or falling edge time of the voltage of the drain end of the power tube, reduce the switching loss, improve the conversion efficiency of the power tube and eliminate the electromagnetic interference generated by ringing current and the large fluctuation of the ground wire.
Drawings
FIG. 1 is a general block diagram showing a circuit configuration of an output stage driving circuit for reducing interference according to a first embodiment of the present invention;
fig. 2 is a circuit configuration diagram of a spectrum spread modulation module according to a first embodiment of the present invention;
fig. 3 is a circuit configuration diagram of an active edge control module according to a first embodiment of the present invention.
Detailed Description
A more detailed description of an output stage driving circuit and control method for reducing interference of the present invention will be presented below in conjunction with a schematic diagram, wherein preferred embodiments of the present invention are shown, it being understood that one skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the invention.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Example 1
The invention provides an output stage driving circuit for reducing interference, which is shown by referring to fig. 1 and comprises a spectrum spread modulation module, an active edge control module and a power tube.
The spectrum spread modulation module, the active edge control module and the power tube are connected in sequence;
the method comprises the steps that a voltage signal Vin is input to a spectrum spreading modulation module, and a pulse width modulation signal Vpwm with a duty ratio proportional to the amplitude of the voltage signal Vin is generated after the modulation of the spectrum spreading modulation module; the pulse width modulation signal Vpwm is input into the active edge control module and drives the active edge control module to generate a gate control signal, and the gate control signal controls the on and off of the power tube.
In the present embodiment, the input voltage signal Vin is modulated by the triangular wave signal Vramp to generate a pulse width modulation signal Vpwm with a duty ratio proportional to the amplitude of the voltage signal Vin, each of which is then modulatedNoise spectrum energy on frequency is averaged, obvious electromagnetic radiation energy peaks are eliminated, and interference of electromagnetic radiation on switching frequency to other circuits or modules is reduced from the source. Furthermore, the active edge control module controls and generates different grid driving signals in different working intervals of the power tube, namely, in T 3 And T 6 The region generates a positive superimposed grid control signal, improves the voltage change rate dv/dt, shortens the rising edge or falling edge time of the voltage of the drain end of the power tube, reduces the switching loss, and improves the conversion efficiency of the power tube. And at T 2 Region and T 7 The region control generates smaller grid control signal, reduces the current change rate di/dt and avoids the current change rate at T 2 Region and T 7 Ringing current is generated in the area, and electromagnetic interference is reduced.
Specifically, referring to fig. 2, the spectrum spreading modulation module includes a spectrum spreading ramp generator and a pulse width modulation comparator.
The voltage signal Vin is connected to the positive electrode of the pulse width modulation comparator; the spectrum expansion slope generator outputs the triangular wave signal Vramp to the negative electrode of the pulse width modulation comparator; after the voltage signal Vin is compared with the triangular wave signal Vramp, the output end of the pulse width modulation comparator outputs the pulse width modulation signal Vpwm.
The frequency spectrum expansion modulation module enables the triangle wave frequency to be continuously changed within a certain range, so that the pulse width modulation signal Vpwm modulated by the pulse width modulation comparator is also continuously changed within a certain range, the switching frequency of the power tube output signal and the frequency of the frequency multiplication harmonic of the switching frequency are also continuously changed, the noise spectrum energy on each frequency is averaged, obvious electromagnetic radiation energy peaks are eliminated, and the interference of electromagnetic radiation on the switching frequency to other circuits or modules is reduced from the source.
Specifically, the duty cycle of the pulse width modulation signal Vpwm is proportional to the amplitude of the voltage signal Vin.
In a specific example, the signal frequency of the triangular wave signal Vramp is 280 khz-360 khz, the pulse width modulation signal Vpwm is the same frequency as the triangular wave signal Vramp, and the signal frequency of the pulse width modulation signal Vpwm is also 280 khz-360 khz.
In addition, in this example, the active edge control module includes a signal processing module, a power tube turn-on weak driving module, a first driving signal level detection module, and a power tube turn-on driving enhancement module.
Specifically, referring to fig. 3, the signal processing module converts the pulse width modulation signal Vpwm into a power tube start control signal Vgh, and inputs the power tube start control signal Vgh to one end of the power tube start weak driving module and the first input end of the first driving signal level detecting module; the output end of the first driving signal level detection module is connected with one end of the power tube opening driving reinforcing module; the other end of the power tube starting driving reinforcing module is connected with the other end of the power tube starting weak driving module and outputs the grid control signal; the other end of the power tube starting drive reinforcing module is also connected with the second input end of the first drive signal level detection module.
When the power tube is turned on, the pulse width modulation signal Vpwm is converted into a power tube turn-on control signal Vgh, and then is input to the power tube turn-on weak driving module and is controlled to generate a small gate charging current, the gate charging current enables the first gate driving signal Vg1_dr of the power tube to slowly rise, and at this time, the current slope change di/dt of the power tube in the T2 region is smaller. The first driving signal level detection module detects the voltage change of a first grid driving signal Vg1_dr in real time, when the voltage of the first grid driving signal Vg1_dr rises to an effective grid driving voltage and breaks through the T2 region, the first driving signal level detection module generates a high-level starting driving enhancement signal on_enhancement, the starting driving enhancement signal on_enhancement enables the power tube starting driving enhancement module, a larger grid charging current is superposed on a small grid charging current generated by the power tube starting weak driving module, so as to generate a second grid driving signal Vg2_dr, at the moment, the first grid driving signal Vg1_dr and the second grid driving signal Vg2_dr jointly drive the power tube, the power tube is conducted and enhanced, and the power tube is started and enhanced at the T 3 The voltage change rate dv/dt of the region becomes large and the drain voltage is rapidly decreased.
Specifically, the second gate driving signal is the first gate driving signal amplified by the power tube start driving strengthening module, and the first gate driving signal is smaller than the second gate driving signal.
Further, the active edge control module further comprises a power tube closing weak driving module, a second driving signal level detection module and a power tube closing driving reinforcing module.
Specifically, referring to fig. 3, the signal processing module converts the pulse width modulation signal Vpwm into a power tube closing control signal Vgl, and then inputs the power tube closing control signal Vgl to one end of the power tube closing weak driving module and the first input end of the second driving signal level detecting module; the output end of the second driving signal level detection module is connected with one end of the power tube closing driving reinforcing module; the other end of the power tube closing driving reinforcing module is connected with the other end of the power tube closing weak driving module and outputs the grid control signal; the other end of the power tube closing drive reinforcing module is also connected with the second input end of the second drive signal level detection module.
When the power tube is turned off, the pulse width modulation signal Vpwm is converted into a power tube turn-off control signal Vgl, and then is input into the power tube turn-off weak driving module to control generation of a small third grid driving signal, meanwhile, the power tube turn-off driving reinforcing module generates a larger fourth grid driving signal, the two grid discharging signals rapidly pull down the power tube grid driving signal Vg_dr, the power tube conducting capacity is rapidly weakened, the voltage change rate dv/dt is increased, and the drain voltage is rapidly increased. The second driving signal level detection module detects the voltage change of the grid driving signal Vg_dr of the power tube in real time, when the voltage of the grid driving signal Vg_dr of the power tube is reduced to an effective grid driving voltage (the power tube breaks through a T6 area and is about to enter a T7 area at the moment), the second driving signal level detection module generates a low-level signal off_enhancement, the power tube closing driving reinforcing module is closed, the grid charging current only remains a third grid driving signal generated by the power tube closing weak driving module, the reduction speed of the grid driving signal Vg_dr is reduced, the current change slope di/dt of the power tube is reduced, and the flowing current is slowly reduced to zero.
Specifically, the fourth gate driving signal is the third gate driving signal amplified by the power tube closing driving strengthening module, and the third gate driving signal is smaller than the fourth gate driving signal.
Further, the effective gate driving voltage is a power tube turn-on threshold voltage V th And overdrive voltage V od And (3) summing.
In the present example, the charge-discharge current driving the gate of the power tube is graded, i.e., at T 3 And T 6 The grid driving signal is overlapped in the region, the grid charging and discharging current is improved, the voltage change rate dv/dt is improved, the rising edge or falling edge time of the voltage of the drain end of the power tube is shortened, the switching loss is reduced, and therefore the conversion efficiency of the power tube is improved. And at T 2 Region and T 7 The region control generates smaller grid driving signals, reduces the charging and discharging current of the grid, reduces the current change rate di/dt and avoids the situation of T 2 Region and T 7 Ringing current is generated in the area, and electromagnetic interference is reduced.
Preferably, the signal processing module is a gate driving signal non-overlapping processing module; the gate driving signal non-overlapping processing module converts the pulse width modulation signal Vpwm into the two-phase non-overlapping power tube on control signal Vgh and the two-phase non-overlapping power tube off control signal Vgl.
Specifically, the non-overlapping processing module of the gate driving signal is configured to ensure that dead time which is low level exists at the same time when the power tube on control signal Vgh and the power tube off control signal Vgl are switched, so as to avoid the conflict between the power tube on driving and the power tube off driving and simultaneously turn on and off the gate driving signal of the power tube.
Example two
The present embodiment provides an output stage driving control method for reducing interference, the method including the following steps:
s1, the frequency spectrum expansion modulation module carries out frequency modulation on a voltage signal Vin to generate a pulse width modulation signal Vpwm with a duty ratio proportional to the amplitude of the voltage signal Vin.
S2, the pulse width modulation signal Vpwm drives the active edge control module to generate different grid control signals in different working intervals of the power tube.
And S3, the gate driving signal controls the on and off of the power tube.
In step S1, the spectrum spreading modulation module is composed of a spectrum spreading ramp generator and a pulse width modulation comparator, the spectrum spreading ramp generator mainly generates a triangular wave signal Vramp with a frequency varying within a certain range, the triangular wave signal Vramp is input to a negative input end of the pulse width modulation comparator, the voltage signal Vin is input to a positive input end of the pulse width modulation comparator, the voltage signal Vin is compared with the triangular wave signal, and the pulse width modulation comparator outputs a pulse width modulation signal Vpwm which varies within a certain range as the frequency.
Because the frequency of the triangular wave Vramp signal is continuously changed within a certain range, the pulse width modulation signal Vpwm modulated by the pulse width modulation comparator is also continuously changed within a certain range of the same frequency, the switching frequency of the power tube output signal and the frequency of the frequency multiplication harmonic of the switching frequency are also continuously changed, and the noise spectrum energy on each frequency is averaged.
Compared with the prior art, the method and the device for eliminating the electromagnetic wave interference through grounding, shielding, filtering and the like have the advantages that the noise energy of the fundamental frequency and the odd harmonics generated by the average clock signal is eliminated, the peak of the noise spectrum density of the fundamental frequency and the odd harmonics is eliminated, the obvious electromagnetic radiation energy peak is eliminated from the source, and the interference of electromagnetic radiation on the switching frequency to other circuits or modules is reduced.
In step S2, the active edge control module includes a signal processing module, a power tube on weak driving module, a first driving signal level detection module, a power tube on driving reinforcing module, a power tube off weak driving module, a second driving signal level detection module, and a power tube off driving reinforcing module.
When the power tube is turned on, the pulse width modulation signal Vpwm is converted into a power tube turn-on control signal Vgh, and then is input into the power tube turn-on weak driving module and is controlled to generate a small grid charging current, the grid charging current enables the first grid driving signal Vg1_dr of the power tube to slowly rise, and at the moment, the current slope change di/dt of the power tube in the T2 area is smaller. The first driving signal level detection module detects the voltage change of the first gate driving signal Vg1_dr in real time, and when the voltage of the first gate driving signal Vg1_dr is increased to V th +V od And break through the said T2 area, the said first driving signal level detection module produces a high level to start the drive enhancement signal on-enhancement, the said high level signal enables the said power tube to start the drive enhancement module, turn on weak driving module to produce small grid charging current and superimpose a greater grid charging current on the power tube, thus produce the second grid driving signal Vg2_dr, at this moment, the said first grid driving signal Vg1_dr and said second grid driving signal Vg2_dr drive the said power tube together, the conduction of the power tube is strengthened, in T 3 The voltage change rate dv/dt of the region becomes large and the drain voltage is rapidly decreased.
When the power tube is turned off, the pulse width modulation signal Vpwm is converted into a power tube turn-off control signal Vgl, and then is input into the power tube turn-off weak driving module to control generation of a small third grid driving signal, meanwhile, the power tube turn-off driving reinforcing module generates a larger fourth grid driving signal, the two grid discharging signals rapidly pull down the power tube grid driving signal Vg_dr, the power tube conducting capacity is rapidly weakened, the voltage change rate dv/dt is increased, and the drain voltage is rapidly increased. The second driving signal level detection module detects the voltage change of the grid driving signal Vg_dr of the power tube in real time, and when the voltage of the grid driving signal Vg_dr of the power tube is reduced to V th +V od When the power tube breaks through the T6 area and is about to enter the T7 area, the second driving signal level detection module generates a low level signal off_enhancement, the power tube closing driving enhancement module is closed, and the grid charging signal only leaves the power tubeThe third gate driving signal generated by the weak driving module is turned off, the decreasing speed of the gate driving signal Vg_dr is reduced, the current change slope di/dt of the power tube is reduced, and the flowing current is slowly reduced to zero.
Compared with the prior art of directly outputting larger grid charging and discharging current to increase T 3 And T 6 The slope dv/dt of the voltage change in the region, but ignores T 2 And T 7 In this embodiment, the charging and discharging current of the grid electrode of the power tube is graded to generate a T of ringing current easily 2 And T 7 The region reduces the change slope di/dt of charge-discharge current, and reduces the ringing voltage on the drain terminal voltage and the ground line of the power tube, thereby reducing electromagnetic interference. And at T 3 And T 6 When the power tube is in the region, the power tube opening driving reinforcing module and the power tube closing driving reinforcing module increase the charge and discharge current for driving the grid electrode of the power tube, shorten the rising edge or falling edge time of the voltage of the drain end of the power tube, reduce the switching loss and improve the conversion efficiency of the power tube.
Preferably, the signal processing module is a gate driving signal non-overlapping processing module; the grid driving signal non-overlapping processing module converts the grid driving signal into the two-phase non-overlapping power tube opening control signal and the power tube closing control signal.
In summary, in this embodiment, the driving circuit and the power tube gate charge-discharge control method are optimized, so that the power tube is controlled to turn on and off, the edge time of the rising/falling edge of the power tube is ensured, and the switching loss is reduced while the electromagnetic interference is reduced. In addition, through a frequency spectrum spread modulation mode, an input signal is modulated by a triangular wave signal with frequency variation, a frequency variation modulation signal with duty ratio being in direct proportion to the amplitude of the input signal is generated, noise spectrum energy on each frequency is averaged, electromagnetic radiation energy peak value is reduced, and interference of electromagnetic radiation on the switching frequency on other circuits or modules is reduced from the source.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An output stage driving circuit for reducing interference, comprising: the device comprises a spectrum spread modulation module, an active edge control module and a power tube;
the voltage signal is input to the spectrum spreading modulation module, and a pulse width modulation signal with the duty ratio being in direct proportion to the amplitude of the voltage signal is generated after the modulation of the spectrum spreading modulation module; the pulse width modulation signal is input into the active edge control module and drives the active edge control module to generate a grid control signal, and the grid control signal controls the on and off of the power tube.
2. The disturbance reducing output stage driver circuit according to claim 1, wherein the spectrum spread modulation module comprises a spectrum spread ramp generator and a pulse width modulation comparator;
the voltage signal is connected to the positive electrode of the pulse width modulation comparator; the spectrum expansion slope generator outputs a triangular wave signal to the cathode of the pulse width modulation comparator; after the voltage signal is compared with the triangular wave signal, the output end of the pulse width modulation comparator outputs the pulse width modulation signal.
3. The output stage driving circuit for reducing interference according to claim 2, wherein the frequency of the triangular wave signal is 280khz to 360khz.
4. The disturbance reducing output stage driver circuit according to claim 2, wherein the active edge control module comprises a signal processing module, a power tube turn-on weak driver module, a first drive signal level detection module, and a power tube turn-on drive enhancement module;
the signal processing module converts the pulse width modulation signal into a power tube starting control signal and inputs the power tube starting control signal to the input end of the power tube starting weak driving module and the first input end of the first driving signal level detection module, and the power tube starting weak driving module outputs a first grid driving signal to drive the power tube;
the first grid driving signal is input to a second input end of the first driving signal level detection module; when the power tube starting control signal is in a high level and the voltage value of the first grid driving signal reaches an effective grid driving voltage; the output end of the first driving signal level detection module outputs a high-level start driving reinforcing signal to the input end of the power tube start driving reinforcing module, the start driving reinforcing signal enables the power tube start driving reinforcing module, and the output end of the power tube start driving reinforcing module outputs a second grid driving signal;
and after the first grid driving signal and the second grid driving signal are overlapped, the power tube is driven together.
5. The disturbance reducing output stage driver circuit according to claim 4, wherein the active edge control module further comprises a power tube turn-off weak driver module, a second drive signal level detection module, and a power tube turn-off drive enhancement module;
the signal processing module converts the pulse width modulation signal into a power tube closing control signal and then inputs the power tube closing control signal to the input end of the power tube closing weak driving module and the first input end of the second driving signal level detection module; the power tube closing weak driving module outputs a third grid driving signal;
the output end of the power tube closing drive reinforcing module outputs a fourth grid drive signal;
the third grid driving signal and the fourth grid driving signal are output and overlapped, and the power tube is closed together;
when the power tube closing control signal is in a high level and the voltage value of the grid driving signal is reduced to an effective grid driving voltage; and the output end of the second driving signal level detection module outputs a low-level closing driving reinforcing signal to the input end of the power tube closing driving reinforcing module, and the closing driving reinforcing signal closes the power tube closing driving reinforcing module.
6. The disturbance reducing output stage driver circuit according to claim 5, wherein the signal processing module is a gate drive signal non-overlapping processing module;
the grid driving signal non-overlapping processing module converts the pulse width modulation signal into the two-phase non-overlapping power tube opening control signal and the power tube closing control signal.
7. A disturbance reduction output stage drive control method employing the disturbance reduction output stage drive circuit according to claim 6, the method comprising the steps of:
the frequency spectrum spread modulation module modulates the voltage signal to generate the pulse width modulation signal with the duty ratio proportional to the amplitude of the voltage signal;
the pulse width modulation signal drives the active edge control module to generate different grid control signals in different working intervals of the power tube;
and the grid control signal controls the on and off of the power tube.
8. The output stage driving control method according to claim 7, wherein,
the frequency spectrum expansion slope generator outputs the triangular wave signal to the cathode of the pulse width modulation comparator, the voltage signal is input to the anode of the pulse width modulation comparator, the voltage signal is compared with the triangular wave signal, and the pulse width modulation signal with the duty ratio proportional to the amplitude of the voltage signal is generated at the output end of the pulse width modulation comparator.
9. The output stage driving control method according to claim 7, wherein,
the grid driving signal non-overlapping processing module converts the pulse width modulation signal into a power tube starting control signal;
in the power tube starting control process, after the power tube starting control signal is input to the power tube starting weak driving module, the power tube starting weak driving module outputs the first grid driving signal;
when the power tube starting control signal is in a high level and the voltage value of the first grid driving signal reaches an effective grid driving voltage, the power tube driving strengthening module is enabled by the starting driving strengthening signal after the starting driving strengthening signal is output by the output end of the first driving signal level detection module; and the power tube starting drive reinforcing module outputs a second grid drive signal, and is overlapped with the first grid drive signal to jointly conduct the power tube.
10. The method of claim 7, wherein,
the grid driving signal non-overlapping processing module converts the pulse width modulation signal into a power tube closing control signal;
in the power tube closing control process, the power tube closing control signal generates a third grid driving signal after passing through the power tube closing weak driving module; meanwhile, the power tube closing drive reinforcing module generates a fourth grid drive signal; the third grid driving signal and the fourth grid driving signal are overlapped to jointly close the power tube;
the second driving signal level detection module detects a grid driving signal, and when the power tube closing control signal is in a high level and the voltage value of the grid driving signal is reduced to an effective grid driving voltage; and the output end of the second driving signal level detection module generates the closing driving reinforcing signal, and the closing driving reinforcing signal closes the power tube closing driving reinforcing module.
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