CN106856371B - Push-pull driving device and method with protection - Google Patents

Push-pull driving device and method with protection Download PDF

Info

Publication number
CN106856371B
CN106856371B CN201710113558.4A CN201710113558A CN106856371B CN 106856371 B CN106856371 B CN 106856371B CN 201710113558 A CN201710113558 A CN 201710113558A CN 106856371 B CN106856371 B CN 106856371B
Authority
CN
China
Prior art keywords
driving
pulse width
width modulation
signal
pulse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710113558.4A
Other languages
Chinese (zh)
Other versions
CN106856371A (en
Inventor
郭毅军
陈建
付健
赵正
温兴东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Xishan Science and Technology Co Ltd
Original Assignee
Chongqing Xishan Science and Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Xishan Science and Technology Co Ltd filed Critical Chongqing Xishan Science and Technology Co Ltd
Priority to CN201710113558.4A priority Critical patent/CN106856371B/en
Publication of CN106856371A publication Critical patent/CN106856371A/en
Application granted granted Critical
Publication of CN106856371B publication Critical patent/CN106856371B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • 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 provides a push-pull driving device with protection, comprising: the square wave generating unit is suitable for generating two paths of pulse signals with the same period and opposite phases according to the pulse width modulation signal source; the driving signal generating unit is suitable for respectively modulating two paths of pulse signals with the same period and opposite phases and generating two paths of pulse width modulation driving signals with a timeout protection function. The invention also provides a method for generating the push-pull driving device with protection, which adopts a pulse width modulation signal source as input and divides the pulse width modulation signal source into two pulse signals with the same duty ratio and opposite phases; and respectively modulating the two paths of pulse signals to generate two paths of pulse width modulation driving signals with overtime protection functions. The pulse width modulation driving signal can be applied to driving power driving circuits with opposite phases such as a push-pull circuit, a full-bridge circuit and the like, and can ensure the normal operation of a switching tube when the pulse width modulation driving signal is in an abnormal condition, thereby achieving the purpose of protecting the switching tube.

Description

Push-pull driving device and method with protection
Technical Field
The invention relates to the technical field of ultrasound, in particular to a push-pull driving device with protection and a method.
Background
An ultrasonic transducer is a device that converts both electrical energy into acoustic energy and acoustic energy into electrical energy. The working principle is that ultrasonic waves are generated by utilizing the inverse piezoelectric effect according to the positive and inverse piezoelectric effect of the piezoelectric material, namely, an alternating sine signal with a certain specific frequency is added to the piezoelectric material, the material is mechanically deformed along with the change of the frequency of the added signal, and then mechanical waves with alternate density are generated in surrounding media, and if the vibration frequency is in an ultrasonic range, the mechanical waves are ultrasonic waves. Upon reception, an acoustic signal from the probe is converted into an electrical signal by positive piezoelectric effect and output.
Ultrasonic transducers are components of an ultrasonic testing system that generate and receive ultrasound, and the performance of their drive circuits plays a critical role in the overall testing system. The existing driving method of the ultrasonic transducer mostly adopts a push-pull power driving mode. Push-pull driving is that two transistors with different polarities output a circuit without output transformer. The power BJT transistors or the MOSFET transistors with the same parameters exist in the circuit in a push-pull mode, are respectively responsible for waveform amplification tasks of positive and negative half cycles, and when the circuit works, only one symmetrical power switch tube is conducted at a time, so that the conduction loss is small and the efficiency is high. The push-pull output may sink current to the load as well as draw current from the load. The advantages are that: the structure is simple, the utilization rate of the magnetic core of the switching transformer is high, and when the push-pull circuit works, only one of the two symmetrical power switching tubes is conducted at a time, so that the conduction loss is small; however, the existing push-pull circuit lacks protection measures when the push-pull circuit outputs the drive signal outwards, and when the drive signal is abnormal, namely, the output high-level waveform exceeds 1 millisecond, the switching tube cannot work normally, and the switching tube is burnt out.
Disclosure of Invention
In view of the above drawbacks of the prior art, the present invention is directed to a push-pull driving device and method with protection, which are used for solving the problem that the normal operation of a switching tube cannot be ensured when the driving signal is abnormal in the prior art.
To achieve the above and other related objects, the present invention provides a push-pull driving apparatus with protection, comprising: the square wave generating unit is suitable for generating two paths of pulse signals with the same period and opposite phases according to the pulse width modulation signal source; the driving signal generating unit is suitable for respectively modulating two paths of pulse signals with the same period and opposite phases and generating two paths of pulse width modulation driving signals with a timeout protection function.
Preferably, the square wave generating unit comprises a frequency divider and a first inverter, wherein the input end of the frequency divider is connected with a pulse width modulation signal source, the output end of the frequency divider outputs a first pulse signal, and the output end of the frequency divider is connected with the first inverter and outputs a second pulse signal.
Preferably, the driving signal generating unit includes two identical driving signal generating modules, and the two driving signal generating modules are respectively connected with two paths of pulse signals with identical periods and opposite phases, and each driving signal generates a path of pulse width modulation driving signal with a timeout protection function.
Preferably, the driving signal generating module includes:
the first modulation subunit is connected with the output end of the square wave generating unit, performs AND gate processing on the pulse width modulation signal source and one path of pulse signals, and outputs and conducts a triode to obtain a first modulation signal; the second modulation subunit is connected with the output end of the first modulation subunit, charges the first modulation signal and outputs a second modulation signal obtained through reverse phase processing; and the third modulation subunit is respectively connected with the output ends of the first modulation subunit and the second modulation subunit, and performs AND gate processing on the first modulation signal and the second modulation signal to obtain a path of pulse width modulation driving signal with a timeout protection function.
Preferably, the first modulation subunit includes a first and gate and a triode; the input end of the first AND gate is respectively connected with a pulse width modulation signal source and a pulse signal; the output end of the power amplifier is connected with the base electrode of the triode, the triode is conducted, and a first modulation signal is output between the collector electrode and the emitter electrode of the triode.
Preferably, the second modulation subunit includes an RC charging circuit and a second inverter, where the RC charging circuit is connected between the collector and the emitter of the triode, and the second inverter is connected between the RC charging circuit, so as to obtain the second modulation signal after the inversion processing.
Preferably, the third modulation subunit includes a second and gate, and an input end of the second and gate is connected with a pulse width modulation signal source and the second modulation signal to perform and gate processing, so as to obtain a path of pulse width modulation driving signal with a timeout protection function.
Preferably, the protected push-pull driving apparatus further comprises: the driving output unit is connected with the output end of the driving signal generating unit and is suitable for generating a switching tube driving signal for driving a switching tube to work according to two paths of pulse width modulation driving signals, and the switching tube is connected with a transformer to drive a load to work.
Preferably, the driving output unit comprises a switching tube driving chip, a switching tube, a transformer and a load, wherein the input end of the switching tube driving chip is connected with two paths of pulse width modulation driving signals, the output end of the switching tube driving chip is connected with the switching tube, the switching tube is connected with the input end of the transformer, and the output end of the transformer is connected with the load.
Another object of the present invention is to provide a push-pull driving method with protection, comprising:
generating two paths of pulse signals with the same period and opposite phases;
based on the pulse width modulation signal source, two paths of pulse signals with the same period and opposite phases are modulated respectively to generate two paths of pulse width modulation driving signals with overtime protection function.
Preferably, the step of generating two pulse signals with the same cycle and opposite phases includes:
decomposing the pulse width modulation signal source into two paths of pulse signals with the same period by using a frequency divider;
and generating pulse signals with the same period and opposite phases by using the first inverter.
Preferably, the step of generating two paths of pulse width modulation driving signals with timeout protection function includes:
and two identical driving signal generating modules are utilized to respectively and correspondingly connect two paths of pulse signals with identical periods and opposite phases to each other to respectively generate one path of pulse width modulation driving signals with overtime protection function.
Preferably, the step of generating a pulse width modulation driving signal with a timeout protection function by using the driving signal generating module includes:
performing AND gate processing on the pulse width modulation signal source and one path of pulse signals, and outputting and conducting a triode to obtain a first modulation signal;
charging the first modulation signal, and outputting a second modulation signal obtained through reverse phase processing;
and performing AND gate processing on the first modulation signal and the second modulation signal to obtain a pulse width modulation driving signal with a timeout protection function.
As described above, the push-pull driving device and method with protection of the present invention have the following advantages:
the pulse width modulation signal source is adopted as input, and the pulse width modulation signal source is divided into two paths of pulse signals with the same duty ratio and opposite phases; and respectively modulating the two paths of pulse signals to generate two paths of pulse width modulation driving signals with overtime protection functions. The pulse width modulation driving signal can be applied to driving power driving circuits with opposite phases such as a push-pull circuit, a full-bridge circuit and the like, and can ensure the normal operation of a switching tube when the pulse width modulation driving signal is in an abnormal condition, thereby achieving the purpose of protecting the switching tube.
Drawings
FIG. 1 is a block diagram showing a push-pull driving apparatus with protection according to the present invention;
FIG. 2 is a block diagram showing a square wave generating unit in a push-pull driving apparatus with protection according to the present invention;
FIG. 3 is a block diagram showing a driving signal generating unit in a push-pull driving apparatus with protection according to the present invention;
FIG. 4 is a block diagram showing a whole structure of a push-pull driving apparatus with protection according to the present invention;
FIG. 5 is a block diagram showing the structure of a driving output unit in a push-pull driving apparatus with protection according to the present invention;
FIG. 6 shows a circuit diagram of a push-pull driving apparatus with protection according to the present invention;
FIG. 7 is a flow chart showing a push-pull driving method with protection according to the present invention;
fig. 8 shows a circuit timing diagram of a push-pull driving device with protection according to the present invention.
Description of element reference numerals
1. Square wave generating unit
2. Drive signal generating unit
3. Drive output unit
11. Frequency divider
12. First inverter
21. Drive signal generation module
211. First modulation subunit
212. Second modulation subunit
213. Third modulation subunit
31. Switch tube driving chip
32. Switch tube
33. Transformer
34. Load(s)
S1-S2 Steps 1-2
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Referring to fig. 1, a block diagram of a push-pull driving device with protection is provided in the present invention, which includes:
the square wave generating unit 1 is suitable for generating two paths of pulse signals with the same period and opposite phases according to a pulse width modulation signal source; the driving signal generating unit 2 is adapted to modulate two paths of pulse signals with the same period and opposite phases respectively, and generate two paths of pulse width modulation driving signals with a timeout protection function.
In the embodiment, the generated pulse width modulation driving signal has a timeout protection function, has a protection function for the normal operation of the switching tube, and avoids the phenomenon that the switching tube is burnt out due to the abnormal driving signal.
Referring to fig. 2, a block diagram of a square wave generating unit in a push-pull driving device with protection is provided, which includes:
the square wave generating unit 1 comprises a frequency divider and a first inverter, wherein the input end of the frequency divider 11 is connected with a pulse width modulation signal source, the output end of the frequency divider 11 outputs a first pulse signal, and the output end of the frequency divider 11 is connected with the first inverter 12 and outputs a second pulse signal.
In this embodiment, the first pulse signal and the second pulse signal are pulse width modulated signals with the same period, the same duty ratio and opposite phases, wherein the frequency divider 11 outputs two periodic signals with the same size and direction, and one output terminal is selected to be connected with the first inverter 12, so as to obtain the first pulse signal and the second pulse signal, wherein the frequency divider 11 and the first inverter 12 correspond to U3A and U2B in fig. 6, and the frequency divider 11 is preferably a chip with the model 74hc393d_z.
Referring to fig. 3, a block diagram of a driving signal generating unit in a push-pull driving device with protection is provided, which includes:
the driving signal generating unit 2 includes two identical driving signal generating modules 21, and the two driving signal generating modules 21 are respectively connected with two pulse signals with opposite phases correspondingly to generate a pulse width modulation driving signal with a timeout protection function.
Specifically, the electronic devices included in the two driving signal generating modules are identical, and only the first pulse signal and the second pulse signal are respectively connected, so that the two output pulse width modulation driving signals are mutually spaced on the waveform diagram, and in one period, the two pulse width modulation driving signals respectively display half periods, namely half periods of phase deviation.
Referring to fig. 6, a circuit diagram of a push-pull driving device with protection is provided in the present invention, which includes:
the driving signal generation module 21 includes:
the first modulation subunit 211 is connected with the output end of the square wave generating unit 1, performs and gate processing on the pulse width modulation signal source and one path of pulse signal, and outputs and turns on a triode to obtain a first modulation signal; the second modulation subunit 212 is connected to the output end of the first modulation subunit 211, charges the first modulation signal, and outputs a second modulation signal obtained through inverse processing; the third modulation subunit 213 is respectively connected to the output ends of the first modulation subunit 211 and the second modulation subunit 212, and performs and gate processing on the first modulation signal and the second modulation signal, so as to obtain a pulse width modulation driving signal with a timeout protection function.
Specifically, the first modulation subunit 211 includes a first and gate and a triode; the input end of the first AND gate is respectively connected with a pulse width modulation signal source and a pulse signal; the output end of the power amplifier is connected with the base electrode of the triode, the triode is conducted, and a first modulation signal is output between the collector electrode and the emitter electrode of the triode. The first and gate and transistor may correspond to U1A and Q1 in fig. 6, or U1C and Q2.
In this embodiment, load resistors are disposed on the base and collector of the triode, wherein a protection resistor is disposed between the emitter and the base of the triode, when the triode is turned on, the emitter is grounded, and when the triode is turned off, the load resistor and the protection resistor are divided, so as to ensure that the triode is in a cut-off state when no input is performed, and stabilize the waveform of the output first pulse signal, wherein the triode can be replaced by a field effect transistor.
Specifically, the second modulation subunit 212 includes an RC charging circuit and a second inverter, where the RC charging circuit is connected between the collector and the emitter of the triode, and the second inverter is connected between the RC charging circuit to obtain a second modulation signal after the inversion processing, and the RC charging circuit and the second inverter may correspond to R3, C1, and U2A, or R8, C2, and U2C in fig. 6.
In this embodiment, a first modulation signal is output between the collector and the emitter of the triode, and the RC charging circuit charges the first modulation signal, where, as shown in fig. 6, the specific time of the timeout protection can be controlled by adjusting the RC parameter between the third resistor and the first capacitor, or between the eighth resistor and the second capacitor, when the RC charges, the larger the resistance value is, the smaller the current is, the longer the charging time is, or the smaller the resistance value is, the larger the current is, the shorter the charging time is, and when the charging voltage is greater than the threshold value (0.7V) of the second inverter, the inverter starts to work, and the second inverter performs inversion processing to obtain the second modulation signal with the phase completely opposite to the first modulation signal.
Specifically, the third modulation subunit 213 includes a second and gate, where an input end of the second and gate is connected to a pulse width modulation signal source and the second modulation signal to perform and gate processing, so as to obtain a path of pulse width modulation driving signal, where the second and gate may be U1B or U1D in fig. 6.
In this embodiment, a path of pulse width modulation driving signal is obtained by performing and gate processing on the first modulation signal and the second modulation signal, where the pulse width modulation driving signal (push-pull output driving signal) has a timeout protection function due to the fact that two paths of pulse signals with opposite phases are included and the pulse signals accessed by the driving signal generating module 21 are different, so that the phase and waveform of the pulse width modulation driving signal output by the driving signal generating module are different.
In another embodiment, as shown in fig. 4, the push-pull driving apparatus with protection further includes: the driving output unit 3 is connected with the output end of the driving signal generating unit 2, and is suitable for generating a switching tube 32 driving signal for driving the switching tube 32 to work according to two paths of pulse width modulation driving signals, and the switching tube 32 is connected with a transformer to drive the load 34 to work.
Specifically, referring to fig. 5, the driving output unit 3 includes a switching tube driving chip 31, a switching tube 32, a transformer 33 and a load 34, wherein an input end of the switching tube driving chip 31 is connected to two paths of pulse width modulation driving signals, an output end of the switching tube driving chip is connected to the switching tube 32, the switching tube 32 is connected to an input end of the transformer 33, and an output end of the transformer 33 is connected to the load 34.
In this embodiment, two input ends of the switching tube driving chip 31 are respectively connected with two paths of pulse width modulation driving signals, two output ends thereof respectively generate two switching tube driving signals with half periods intersecting, each output end is connected with a corresponding switching tube 2, wherein the switching tube driving chip 31 is preferably a chip with a model of IR2110S, the two switching tubes 32 are preferably NMOS tubes, an input end of a transformer 33 is connected between drain electrodes thereof, a power supply is arranged in the middle of the input end, one of the NMOS tubes can be driven to amplify the transformer 33, and a load 34 starts to work, wherein the switching tube driving chip 31 is U6 in the figure, switching tubes Q3 and Q4, and a transformer T1 and a load RL.
Specifically, an RC absorption loop is arranged between the output end of the switching tube driving chip and the switching tube, so that output waveform oscillation is prevented.
Referring to fig. 7, the present invention provides a push-pull driving method with protection, which includes:
step S1, generating two pulse signals with the same duty ratio and opposite phases;
under the excitation of a pulse width modulation signal source, two paths of pulse signals with the same duty ratio and opposite phases can be obtained through a frequency divider and an inverter.
Specifically, step S1 includes: decomposing the pulse width modulation signal source into two paths of pulse signals with the same period by using a frequency divider; and generating pulse signals with the same period and opposite phases by using the first inverter.
And S2, respectively modulating two paths of pulse signals with opposite phases based on a pulse width modulation signal source to generate two paths of pulse width modulation driving signals with a timeout protection function.
Specifically, the time of overtime protection can be adjusted by setting the parameters of the resistance and the capacitance of the RC charging circuit; the pulse signal generation module 21 modulates the pulse signal to generate a pulse width modulated driving signal with a timeout protection function, which is described in detail below:
two identical driving signal generating modules are utilized to respectively and correspondingly connect two paths of pulse signals with identical periods and opposite phases to each other to respectively generate a path of pulse width modulation driving signals with overtime protection function; the step of pulse width modulation driving signal with overtime protection function by the driving signal generating module comprises the following specific steps:
performing AND gate processing on the pulse width modulation signal source and one path of pulse signals, and outputting and conducting a triode to obtain a first modulation signal;
charging the first modulation signal, and outputting a second modulation signal obtained through reverse phase processing;
and performing AND gate processing on the first modulation signal and the second modulation signal to obtain a pulse width modulation driving signal with a timeout protection function.
Referring to fig. 8, a circuit timing diagram of a push-pull driving device with protection according to the present invention includes:
in this embodiment, the pulse width modulation signal source is PWM, the first pulse signal and the second pulse signal correspond to period, period', the first modulation signal is PWM1 or PWM2, the second modulation signal is PWM1 BF or PWM2 BF, and the pulse width modulation driving signal is PWM1OUT or PWM2OUT, wherein when the first pulse signal is period, the corresponding first modulation signal is PWM1, the second modulation signal is PWM1 BF, and the pulse width modulation driving signal is PWM1OUT, which is not described herein.
According to the period division, a periodic signal obtained by an inverter at one output end of the frequency divider is period or period', when the first pulse signal is period, the first modulation signal PWM1 is obtained by performing AND gate operation on the pulse width modulation signal source PWM and the periodic signal period, the first modulation signal PWM1 is subjected to second inversion operation to obtain a second modulation signal which is PWM1_BF, and the first modulation signal PWM1 and the second modulation signal which are PWM1_BF are subjected to AND gate operation to obtain a pulse width modulation driving signal PWM1OUT.
Similarly, when the first pulse signal is period ', the first modulation signal PWM2 is obtained by performing and gate operation on the pulse width modulation signal source PWM and the period signal period', the second modulation signal PWM2 is obtained by performing second inversion operation on the first modulation signal PWM2, and the pulse width modulation driving signal PWM2OUT is obtained by performing and gate operation on the first modulation signal PWM2 and the second modulation signal PWM2 BF.
Compared with the direct drive of a pulse width modulation signal source PWM, in the time sequence diagram, when the duration of a high level in the PWM is longer than 1 millisecond, such as the duration of the high level in the middle of the time sequence diagram, the output pulse width modulation drive signal PWM2OUT or PWM1OUT is adopted to directly serve as the drive signal of a drive circuit, so that a switching tube can not stop working due to abnormal conditions, and the purpose of protecting the switching tube is achieved.
In summary, a pulse width modulation signal source is used as an input, and is divided into two pulse signals with the same duty ratio and opposite phases; and respectively modulating the two paths of pulse signals to generate two paths of pulse width modulation driving signals with overtime protection functions. The pulse width modulation driving signal drives the power driving circuits with opposite phases such as the push-pull circuit, the full-bridge circuit and the like, and when the pulse width modulation driving signal is in an abnormal condition, the normal operation of the switching tube can be ensured. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (9)

1. A protected push-pull drive comprising: the square wave generating unit is suitable for generating two paths of pulse signals with the same period and opposite phases according to the pulse width modulation signal source; the driving signal generating unit is suitable for respectively modulating two paths of pulse signals with the same period and opposite phases and generating two paths of pulse width modulation driving signals with overtime protection functions;
the driving signal generating unit comprises two identical driving signal generating modules, and the two driving signal generating modules are respectively correspondingly connected with two paths of pulse signals with identical periods and opposite phases to generate a path of pulse width modulation driving signals with overtime protection function;
the driving signal generation module includes: the first modulation subunit is connected with the output end of the square wave generating unit, performs AND gate processing on the pulse width modulation signal source and one path of pulse signals, and outputs and conducts a triode to obtain a first modulation signal; the second modulation subunit is connected with the output end of the first modulation subunit, charges the first modulation signal and outputs a second modulation signal obtained through reverse phase processing; and the third modulation subunit is respectively connected with the output ends of the first modulation subunit and the second modulation subunit, and performs AND gate processing on the first modulation signal and the second modulation signal to obtain a path of pulse width modulation driving signal with a timeout protection function.
2. The push-pull driving device with protection according to claim 1, wherein the square wave generating unit comprises a frequency divider and a first inverter, an input end of the frequency divider is connected with a pulse width modulation signal source, an output end of the frequency divider outputs a first pulse signal, and an output end of the frequency divider is connected with the first inverter and outputs a second pulse signal.
3. The protected push-pull driving apparatus according to claim 1, wherein the first modulation subunit comprises a first and gate and a transistor; the input end of the first AND gate is respectively connected with a pulse width modulation signal source and a pulse signal; the output end of the power amplifier is connected with the base electrode of the triode, the triode is conducted, and a first modulation signal is output between the collector electrode and the emitter electrode of the triode.
4. The protected push-pull driving apparatus according to claim 1, wherein the second modulation subunit comprises an RC charging circuit and a second inverter, the RC charging circuit is connected between the collector and the emitter of the triode, and the second inverter is connected in the middle of the RC charging circuit, so as to obtain the second modulation signal subjected to the inversion processing.
5. The push-pull driving device with protection according to claim 1, wherein the third modulation subunit comprises a second and gate, and an input end of the second and gate is connected with a pulse width modulation signal source and the second modulation signal to perform and gate processing, so as to obtain a pulse width modulation driving signal with a timeout protection function.
6. The protected push-pull driving apparatus according to claim 1, further comprising: the driving output unit is connected with the output end of the driving signal generating unit and is suitable for generating a switching tube driving signal for driving a switching tube to work according to two paths of pulse width modulation driving signals, and the switching tube is connected with a transformer to drive a load to work.
7. The push-pull driving apparatus with protection according to claim 6, wherein the driving output unit comprises a switching tube driving chip, a switching tube, a transformer and a load, the input end of the switching tube driving chip is connected with two paths of pulse width modulation driving signals, the output end of the switching tube driving chip is connected with the switching tube, the switching tube is connected with the input end of the transformer, and the output end of the transformer is connected with the load.
8. A push-pull driving method with protection, comprising:
generating two paths of pulse signals with the same period and opposite phases;
based on a pulse width modulation signal source, respectively modulating two paths of pulse signals with the same period and opposite phases to generate two paths of pulse width modulation driving signals with overtime protection functions;
the step of generating two paths of pulse width modulation driving signals with timeout protection function comprises the following steps: two identical driving signal generating modules are utilized to respectively and correspondingly connect two paths of pulse signals with identical periods and opposite phases to each other to respectively generate a path of pulse width modulation driving signals with overtime protection function;
the step of generating a pulse width modulation driving signal with a timeout protection function by using the driving signal generating module comprises the following steps:
performing AND gate processing on the pulse width modulation signal source and one path of pulse signals, and outputting and conducting a triode to obtain a first modulation signal;
charging the first modulation signal, and outputting a second modulation signal obtained through reverse phase processing;
and performing AND gate processing on the first modulation signal and the second modulation signal to obtain a pulse width modulation driving signal with a timeout protection function.
9. The protected push-pull driving method as claimed in claim 8, wherein the step of generating two pulse signals having the same period and opposite phases comprises:
decomposing the pulse width modulation signal source into two paths of pulse signals with the same period by using a frequency divider;
and generating pulse signals with the same period and opposite phases by using the first inverter.
CN201710113558.4A 2017-02-28 2017-02-28 Push-pull driving device and method with protection Active CN106856371B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710113558.4A CN106856371B (en) 2017-02-28 2017-02-28 Push-pull driving device and method with protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710113558.4A CN106856371B (en) 2017-02-28 2017-02-28 Push-pull driving device and method with protection

Publications (2)

Publication Number Publication Date
CN106856371A CN106856371A (en) 2017-06-16
CN106856371B true CN106856371B (en) 2023-06-20

Family

ID=59125158

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710113558.4A Active CN106856371B (en) 2017-02-28 2017-02-28 Push-pull driving device and method with protection

Country Status (1)

Country Link
CN (1) CN106856371B (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11308875A (en) * 1998-04-20 1999-11-05 Taiyo Yuden Co Ltd Piezoelectric body driven device
CN101510738A (en) * 2008-02-14 2009-08-19 硕颉科技股份有限公司 Circuit for generating drive signal
CN101764595A (en) * 2009-11-23 2010-06-30 宁波德斯科电子科技有限公司 IGBT drive and protection circuit
CN102629835A (en) * 2012-04-10 2012-08-08 东莞市有有光电有限公司 Inverter
CN202713130U (en) * 2012-07-03 2013-01-30 湖南科美达电气股份有限公司 Push-pull type thyristor trigger circuit
CN103715871A (en) * 2014-01-02 2014-04-09 上海理工大学 High-power MOSFET driving circuit
CN103840642A (en) * 2012-11-27 2014-06-04 美的集团股份有限公司 Electromagnetic heating device and drive circuit thereof
CN204119014U (en) * 2014-11-03 2015-01-21 哈尔滨同为电气股份有限公司 A kind of IGBT for three level drives and protective circuit
CN204538951U (en) * 2015-04-24 2015-08-05 深圳市易优电气有限公司 A kind of H-bridge drive circuit
CN106059546A (en) * 2016-07-26 2016-10-26 成都知人善用信息技术有限公司 Pulse modulation processing circuit
CN206759317U (en) * 2017-02-28 2017-12-15 重庆西山科技股份有限公司 Push-pull drive device with protection

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100956098B1 (en) * 2002-07-18 2010-05-07 소니 주식회사 Power amplifier
DE602005005945D1 (en) * 2005-02-22 2008-05-21 St Microelectronics Srl Secondary post-regulator with PBM
CN102682708A (en) * 2011-03-15 2012-09-19 国琏电子（上海）有限公司 Multiple lamp tube driving system

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11308875A (en) * 1998-04-20 1999-11-05 Taiyo Yuden Co Ltd Piezoelectric body driven device
CN101510738A (en) * 2008-02-14 2009-08-19 硕颉科技股份有限公司 Circuit for generating drive signal
CN101764595A (en) * 2009-11-23 2010-06-30 宁波德斯科电子科技有限公司 IGBT drive and protection circuit
CN102629835A (en) * 2012-04-10 2012-08-08 东莞市有有光电有限公司 Inverter
CN202713130U (en) * 2012-07-03 2013-01-30 湖南科美达电气股份有限公司 Push-pull type thyristor trigger circuit
CN103840642A (en) * 2012-11-27 2014-06-04 美的集团股份有限公司 Electromagnetic heating device and drive circuit thereof
CN103715871A (en) * 2014-01-02 2014-04-09 上海理工大学 High-power MOSFET driving circuit
CN204119014U (en) * 2014-11-03 2015-01-21 哈尔滨同为电气股份有限公司 A kind of IGBT for three level drives and protective circuit
CN204538951U (en) * 2015-04-24 2015-08-05 深圳市易优电气有限公司 A kind of H-bridge drive circuit
CN106059546A (en) * 2016-07-26 2016-10-26 成都知人善用信息技术有限公司 Pulse modulation processing circuit
CN206759317U (en) * 2017-02-28 2017-12-15 重庆西山科技股份有限公司 Push-pull drive device with protection

Also Published As

Publication number Publication date
CN106856371A (en) 2017-06-16

Similar Documents

Publication Publication Date Title
CN101233676B (en) Motor driven unit, motor drive method and cooling apparatus using the unit
JP2017139950A5 (en)
Doucet et al. DC/AC pure sine wave inverter
CN102694483A (en) LC (inductance/capacitance) resonance drive circuit for ultrasonic motor and control method of LC resonance drive circuit
CN106856371B (en) Push-pull driving device and method with protection
JP2009065663A (en) High voltage, high speed and high pulse repetition rate pulse generator
CN102132631A (en) Electric discharge lamp lighting device
CN206759317U (en) Push-pull drive device with protection
Fulkerson et al. Driving Pockels cells using avalanche transistor pulsers
CN110199345A (en) Audio device, sound controller and program
CN106712471B (en) PWM power control device
Ebrahimi et al. Real-time Control of resonance point of piezoelectric transducers based on class D power converter
CN106622925A (en) Full-bridge driving device/method, ultrasonic transducer and ultrasonic system
CN102931821B (en) Field effect transistor drive circuit
Cervantes et al. FPGA-based real-time simulation of a full bridge-RL load SPWM inverter
JP6681532B2 (en) Drive
Basa et al. Design of a varying ultrasonic frequency amplifier
Thu et al. Design and implementation of solar inverter for pure sine wave inverter
WO2018047448A1 (en) Signal generation circuit
CN211702385U (en) Frequency-following electronic horn
TWI524649B (en) Polar switch circuit
CN102135785A (en) Device for producing current pulse
CN217083885U (en) Ultrasonic probe drive circuit
Yu et al. Transducer driver with active bootstrap switch
CN211160544U (en) Ultrasonic transducer drive circuit

Legal Events

Date Code Title Description
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant