CN106622925B - Full-bridge driving device/method, ultrasonic transducer and ultrasonic system - Google Patents
Full-bridge driving device/method, ultrasonic transducer and ultrasonic system Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
Abstract
The invention provides a full-bridge driving device/method, an ultrasonic transducer and an ultrasonic system, wherein the full-bridge driving device comprises a first half-bridge driving module and a second half-bridge driving module which have the same structure; the first half-axle drive module includes: the first half bridge driving unit converts a first driving pulse signal input from the outside into a first high side driving signal and a first low side driving signal; the first power driving unit amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive the first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive the first low-side switching tube; and the first return difference protection unit controls the return difference of the first half-axle driving unit. The full-bridge driving device or the full-bridge driving method can be applied to the ultrasonic transducer to realize the full-bridge driving of the ultrasonic transducer, the protection time in the driving process can be flexibly set, and meanwhile, the full-bridge driving device or the full-bridge driving method has a power protection function with return difference.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, relates to a driving circuit, and particularly relates to a full-bridge driving device/method, an ultrasonic transducer and an ultrasonic system.
Background
An ultrasonic transducer is a device that can convert electrical energy into acoustic energy, and also can convert acoustic energy into electrical energy. The working principle is that according to the positive and inverse piezoelectric effect of the piezoelectric material, the inverse piezoelectric effect is utilized to generate ultrasonic waves, namely, an alternating sinusoidal signal with a certain specific frequency is added on the piezoelectric material, the material can be mechanically deformed along with the change of the frequency of the added signal, and then mechanical waves with density and density are generated in a surrounding medium, and if the vibration frequency of the material is in the ultrasonic range, the mechanical waves are the ultrasonic waves. In receiving, an acoustic signal from the probe is converted into an electric signal by the positive piezoelectric effect and output. For example, ultrasonic surgical systems utilize the inverse piezoelectric effect of an ultrasonic transducer, while ultrasonic testing systems utilize the positive and inverse piezoelectric effect of an ultrasonic transducer.
The ultrasonic transducer is a key component for generating ultrasonic vibration in an ultrasonic surgical system and is also a component for generating and receiving ultrasonic in an ultrasonic testing system, and the performance of a driving circuit of the ultrasonic transducer plays a crucial role in the whole ultrasonic surgical system or the ultrasonic testing system. The existing driving method of the ultrasonic transducer mostly adopts a push-pull power driving mode. The push-pull drive is a transistor output circuit without an output transformer with two different polarities. The power BJT transistors or MOSFET transistors with the same parameters exist in a circuit in a push-pull mode, and are respectively responsible for positive and negative half-cycle waveform amplification tasks, and when the circuit works, only one of the two symmetrical power switch transistors is conducted each time, so that the conduction loss is small, and the efficiency is high. The push-pull output can both sink current to the load and draw current from the load. The disadvantages are that: the transformer is provided with a center tap, and the bearing voltage of the switch tube is higher; due to the existence of the leakage inductance of the primary side of the transformer, a drain-source electrode can generate a larger voltage peak at the moment when a power switch tube is turned off, and in addition, the ripple wave of input current is larger, so that the volume of an input filter is larger.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a full-bridge driving apparatus/method, an ultrasound transducer and an ultrasound system, which are used to solve the problem that the push-pull driving circuit of the existing ultrasound transducer lacks a protection function.
To achieve the above and other related objects, the present invention provides a full-bridge driving apparatus, which includes a first half-bridge driving module and a second half-bridge driving module; the first driving signal output by the first half-bridge driving module and the second driving signal output by the second half-bridge driving module drive an ultrasonic transducer; the first half-bridge drive module includes: a first half bridge driving unit converting a first driving pulse signal inputted from the outside into a first high side driving signal and a first low side driving signal; the first power driving unit is connected with the first half bridge driving unit, amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive a first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive a first low-side switching tube; the first return difference protection unit is used for acquiring a first working current signal of the first high-side switching tube or the first low-side switching tube, converting the first working current signal into a first return difference protection signal, transmitting the first return difference protection signal to the first half-bridge driving unit and controlling the return difference of the first half-bridge driving unit; the first working current signal is the first driving signal; the second half-bridge drive module includes: a second half-bridge driving unit converting a second driving pulse signal inputted from the outside into a second high side driving signal and a second low side driving signal; the second power driving unit is connected with the second half-bridge driving unit, amplifies the second high-side driving signal into a second high-side switching tube driving signal to drive a second high-side switching tube, and amplifies the second low-side driving signal into a second low-side switching tube driving signal to drive a second low-side switching tube; the second return difference protection unit is used for acquiring a second working current signal of the second high-side switching tube or the second low-side switching tube, converting the second working current signal into a second return difference protection signal, transmitting the second return difference protection signal to the second half-bridge driving unit and controlling the return difference of the second half-bridge driving unit; the second working current signal is the second driving signal.
In an embodiment of the present invention, the first loopback protection unit includes: the first sampling resistor is arranged between the output end of the first low-side switching tube and the ground and is used for collecting a first working current signal of the first high-side switching tube or the first low-side switching tube; the output end of the first high-side switching tube is connected with the output end of the first low-side switching tube in series; the first resistance-capacitance filter is connected with the first sampling resistor in parallel, carries out filtering processing on the first working current and outputs a stable first direct current sampling signal; the first proportional amplifier is connected with the output end of the first resistance-capacitance filter and amplifies the first direct current sampling signal; the first protection circuit is connected with the output end of the first proportional amplifier and comprises a first protection time configuration unit and a first protection signal feedback unit; a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier, and an output end of the first protection signal feedback unit is connected with a protection input end of the first half-bridge driving unit; the first protection time configuration unit is connected between the first input end and the second input end of the first protection signal feedback unit.
In an embodiment of the invention, a first input terminal of the first protection signal feedback unit is connected to an output terminal of the first proportional amplifier through a diode, so as to prevent current from flowing backwards.
In an embodiment of the present invention, the second return difference protection unit includes: the second sampling resistor is arranged between the output end of the second low-side switching tube and the ground and is used for collecting a second working current signal of the second high-side switching tube or the second low-side switching tube; the output end of the second high-side switching tube is connected with the output end of the second low-side switching tube in series; the second resistance-capacitance filter is connected with the second sampling resistor in parallel, and is used for filtering the second working current and outputting a stable second direct current sampling signal; the second proportional amplifier is connected with the output end of the second resistance-capacitance filter and amplifies the second direct current sampling signal; the second protection circuit is connected with the output end of the second proportional amplifier and comprises a second protection time configuration unit and a second protection signal feedback unit; a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier, and an output end of the second protection signal feedback unit is connected with a protection input end of the second half-bridge driving unit; the second protection time configuration unit is connected between the first input end and the second input end of the second protection signal feedback unit.
In an embodiment of the invention, the first input terminal of the second protection signal feedback unit is connected to the output terminal of the second proportional amplifier through a diode, so as to prevent the current from flowing backwards.
The invention also provides a full-bridge driving method, which comprises the following steps: driving an ultrasonic transducer by a first driving signal output by the first half-bridge driving module and a second driving signal output by the second half-bridge driving module; wherein the first half-bridge drive module comprises: a first half bridge driving unit converting a first driving pulse signal inputted from the outside into a first high side driving signal and a first low side driving signal; the first power driving unit is connected with the first half bridge driving unit, amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive a first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive a first low-side switching tube; the first return difference protection unit is used for acquiring a first working current signal of the first high-side switching tube or the first low-side switching tube, converting the first working current signal into a first return difference protection signal, transmitting the first return difference protection signal to the first half-bridge driving unit and controlling the return difference of the first half-bridge driving unit; the first working current signal is the first driving signal; the second half-bridge drive module includes: a second half-bridge driving unit converting a second driving pulse signal inputted from the outside into a second high side driving signal and a second low side driving signal; the second power driving unit is connected with the second half-bridge driving unit, amplifies the second high-side driving signal into a second high-side switching tube driving signal to drive a second high-side switching tube, and amplifies the second low-side driving signal into a second low-side switching tube driving signal to drive a second low-side switching tube; the second return difference protection unit is used for acquiring a second working current signal of the second high-side switching tube or the second low-side switching tube, converting the second working current signal into a second return difference protection signal, transmitting the second return difference protection signal to the second half-bridge driving unit and controlling the return difference of the second half-bridge driving unit; the second working current signal is the second driving signal.
In an embodiment of the invention, the operating method of the first loopback protection unit includes: acquiring a first working current signal of the first high-side switching tube or the first low-side switching tube by using a first sampling resistor arranged between the output end of the first low-side switching tube and the ground; the output end of the first high-side switching tube is connected with the output end of the first low-side switching tube in series; filtering the first working current by using a first resistance-capacitance filter connected with the first sampling resistor in parallel, and outputting a stable first direct current sampling signal; amplifying the first DC sampling signal by using a first proportional amplifier connected with the output end of the first resistance-capacitance filter; transmitting the first return difference protection signal to the first half-bridge driving unit by using a first protection circuit connected with an output end of the first proportional amplifier; the first protection circuit comprises a first protection time configuration unit and a first protection signal feedback unit; a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier, and an output end of the first protection signal feedback unit is connected with a protection input end of the first half-bridge driving unit; the first protection time configuration unit is connected between the first input end and the second input end of the first protection signal feedback unit.
In an embodiment of the present invention, the operating method of the second return difference protection unit includes: acquiring a second working current signal of the second high-side switching tube or the second low-side switching tube by using a second sampling resistor arranged between the output end of the second low-side switching tube and the ground; the output end of the second high-side switching tube is connected with the output end of the second low-side switching tube in series; filtering the second working current by using a second resistance-capacitance filter connected with the second sampling resistor in parallel, and outputting a stable second direct current sampling signal; amplifying the second direct current sampling signal by using a second proportional amplifier connected with the output end of the second resistance-capacitance filter; transmitting the second return difference protection signal to the second half-bridge driving unit by using a second protection circuit connected to an output terminal of the second proportional amplifier; the second protection circuit comprises a second protection time configuration unit and a second protection signal feedback unit; a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier, and an output end of the second protection signal feedback unit is connected with a protection input end of the second half-bridge driving unit; the second protection time configuration unit is connected between the first input end and the second input end of the second protection signal feedback unit.
The invention also provides an ultrasonic transducer, which is driven by the first drive signal or the second drive signal output by the full-bridge drive device.
The invention also provides an ultrasonic system which comprises the full-bridge driving device.
As described above, the full-bridge driving apparatus/method, the ultrasonic transducer and the ultrasonic system according to the present invention have the following advantages:
the full-bridge driving device or the method can be applied to the ultrasonic transducer to realize the full-bridge driving of the ultrasonic transducer, and the protection time in the driving process can be flexibly set, and simultaneously, the full-bridge driving device or the full-bridge driving method also has the power protection function with the return difference.
Drawings
Fig. 1 is a schematic diagram illustrating an implementation structure of a full-bridge driving apparatus according to an embodiment of the present invention.
Fig. 2a is a schematic diagram illustrating an implementation structure of the first flyback protection unit of the full-bridge driving device according to the embodiment of the invention.
Fig. 2b is a schematic diagram illustrating an implementation structure of the second return difference protection unit of the full-bridge driving apparatus according to the embodiment of the invention.
Fig. 3 is a schematic diagram illustrating an exemplary circuit structure of a full-bridge driving apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart illustrating an implementation of the full-bridge driving method according to the embodiment of the invention.
Fig. 5 is a schematic flow chart illustrating an implementation of a working method of the first loopback protection unit according to an embodiment of the present invention.
Fig. 6 is a schematic flow chart illustrating an implementation of a working method of the second return difference protection unit according to an embodiment of the present invention.
Description of the element reference numerals
100 full-bridge driving device
110 first half-axle drive module
111 first half-axle drive unit
112 first power driving unit
113 first return difference protection unit
1131 first sampling resistor
1132 first resistance-capacitance filter
1133 first proportional amplifier
1134 first protection circuit
120 second half-bridge drive module
121 second half-bridge drive unit
122 second power driving unit
123 second return difference protection unit
1231 second sampling resistor
1232 second rc filter
1232 second proportional amplifier
1234 second protection circuit
200 ultrasonic transducer
S501-S504 steps
S601 to S604
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, a full-bridge driving apparatus 100 according to an embodiment of the present invention includes a first half-bridge driving module 110 and a second half-bridge driving module 120; the first driving signal output by the first half-bridge driving module and the second driving signal output by the second half-bridge driving module drive an ultrasonic transducer 200. The ultrasonic transducer 200 is an ultrasonic transducer for ultrasonic surgical treatment.
The first half-bridge driving module 110 includes a first half-bridge driving unit 111, a first power driving unit 112, and a first return protection unit 113. The first half bridge driving unit 111 converts a first driving pulse signal inputted from the outside into a first high side driving signal and a first low side driving signal. The first power driving unit 112 is connected to the first half-bridge driving unit 111, and amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive the first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive the first low-side switching tube. The High-side Driver (HSD) is to enable the driving device by closing a switch on a power line directly in front of the consumer or the driving device, and the Low-side Driver (LSD) is to enable the driving device by closing a ground line after the consumer or the driving device. The first return difference protection unit 113 collects a first working current signal of the first high-side switching tube or the first low-side switching tube, converts the first working current signal into a first return difference protection signal, transmits the first return difference protection signal to the first half-bridge driving unit, and controls the return difference of the first half-bridge driving unit; the first working current signal is the first driving signal. The return difference is the maximum deviation between two characteristic curves obtained by ascending and descending measured values in the whole measuring range of the meter, and is also called the variation of the meter. This maximum deviation value is set, and is referred to as the "return difference setting", and includes the setting of the hysteresis loop and the dead zone. Hysteresis is a property of the output of a measuring device that relates to the sequence of previous inputs. When the input quantity reaches the same quantity from the increasing direction and the decreasing direction, respectively, the difference between the two output quantities is called a hysteresis error. The dead zone refers to an area which can not be controlled, generally refers to a '0' area of output voltage and current of a power device in a frequency converter, and generally refers to a zero-crossing area of forward and reverse conversion voltage and current of a motor in transmission control. The smaller the dead time, the better, but the dead time is set for safety and thus must not be eliminated. The best settings are: on the premise of ensuring safety, the smaller the dead zone is, the better the dead zone is, and the purposes of not exploding the power tube and not short-circuiting the output are achieved.
The second half-bridge driving module 120 includes: a second half-bridge driving unit 121, a second power driving unit 122, and a second return difference protection unit 123. The second half-bridge driving unit 121 converts a second driving pulse signal input from the outside into a second high-side driving signal and a second low-side driving signal. The second power driving unit 122 is connected to the second half-bridge driving unit 121, and amplifies the second high-side driving signal into a second high-side switching tube driving signal to drive the second high-side switching tube, and amplifies the second low-side driving signal into a second low-side switching tube driving signal to drive the second low-side switching tube. The second return difference protection unit 123 collects a second working current signal of the second high-side switching tube or the second low-side switching tube, converts the second working current signal into a second return difference protection signal, and transmits the second return difference protection signal to the second half-bridge driving unit to control the return difference of the second half-bridge driving unit; the second working current signal is the second driving signal.
Referring to fig. 2a, the first return protection unit 113 includes: a first sampling resistor 1131, a first rc filter 1132, a first proportional amplifier 1133, and a first protection circuit 1134. The first sampling resistor 1131 is disposed between the output end of the first low-side switching tube and ground, and is configured to collect a first working current signal of the first high-side switching tube or the first low-side switching tube; the output end of the first high-side switching tube is connected with the output end of the first low-side switching tube in series; the first resistance-capacitance filter 1132 is connected in parallel with the first sampling resistor, and is used for filtering the first working current and outputting a stable first direct-current sampling signal; the first proportional amplifier 1133 is connected to an output end of the first rc filter, and amplifies the first dc sampled signal; the first protection circuit 1134 is connected to the output end of the first proportional amplifier, and includes a first protection time configuration unit and a first protection signal feedback unit; a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier, and an output end of the first protection signal feedback unit is connected with a protection input end of the first half-bridge driving unit; the first protection time configuration unit is connected between the first input end and the second input end of the first protection signal feedback unit. And a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier through a diode, so that current backflow is prevented.
Referring to fig. 2b, the second return difference protection unit 123 includes: a second sampling resistor 1231, a second rc filter 1232, a second proportional amplifier 1233, and a second protection circuit 1234. The second sampling resistor 1231 is arranged between the output end of the second low-side switching tube and the ground, and is used for collecting a second working current signal of the second high-side switching tube or the second low-side switching tube; the output end of the second high-side switching tube is connected with the output end of the second low-side switching tube in series; the second rc filter 1232 is connected in parallel with the second sampling resistor, and performs filtering processing on the second working current to output a stable second dc sampling signal; the second proportional amplifier 1233 is connected to the output end of the second rc filter, and amplifies the second dc sampling signal; the second protection circuit 1234 is connected to the output end of the second proportional amplifier, and includes a second protection time configuration unit and a second protection signal feedback unit; a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier, and an output end of the second protection signal feedback unit is connected with a protection input end of the second half-bridge driving unit; the second protection time configuration unit is connected between the first input end and the second input end of the second protection signal feedback unit. And a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier through a diode, so that current backflow is prevented.
Fig. 3 is an exemplary circuit structure of the full-bridge driving apparatus, which is formed by combining two sets of half-bridge circuits with identical structures. The first group of half-bridge circuits comprises a half-bridge driving chip U1, a power driving chip U2, a first high-side switching tube Q1, a first low-side switching tube Q2, a resistor R10, a proportional amplifier U3A and a comparator U3B; a half-bridge driving chip U1 is connected with a power driving chip U2, the power driving chip U2 is respectively connected with a first high-side switching tube Q1 and a first low-side switching tube Q2, a resistor R10 is respectively connected with a first high-side switching tube Q1 and a first low-side switching tube Q2, and a proportional amplifier U3A is connected with a resistor R10 through a resistance-capacitance filter; the comparator U3B is connected with the proportional amplifier U3A through a protection circuit, and the protection circuit comprises D4, C6 and R11; d4 is used for preventing current backflow and ensuring protection time; c6 and R11 are used for configuring protection time; u3b is respectively connected with R7, R12, R13, R15 and R16, and realizes the protection function with poor return. The first half-bridge driving unit is a half-bridge driving chip U1; the first power driving unit is a power driving chip U2; the first high-side switch tube is a first high-side switch tube Q1; the first low-side switching tube is a first low-side switching tube Q2; the first sampling resistor is a resistor R10; the first resistance-capacitance filter is R6 and C5 which are connected with R10 in parallel; the first proportional amplifier is a proportional amplifier U3A; the first protection time configuration unit comprises a D4 connected with the output end of the proportional amplifier U3A, and a C6 and an R11 respectively connected with D4 in series; d4 is used for preventing current backflow and ensuring protection time; c6 and R11 are connected in parallel and used for configuring protection time; the first protection signal feedback unit comprises U3B, R7, R12, R13, R15 and R16; wherein R12 is connected between the positive input end and the output end of U3B, R7 is connected between the output end of U3B and voltage VCC, R13 and R15 are connected in series between the positive input end of U3B and voltage VCC, and R16 is connected between R13 and ground.
The driving signal PWM 1 generates a first high-side driving signal PWM-H and a first low-side driving signal PWM-L through a half-bridge driving chip U1, and the signals PWM-H and PWM-L generate switching tube driving signals PWM-H _1 and PWM-L _1 after being amplified by a power driving chip U2 and are used for directly driving a first high-side switching tube Q1 and a first low-side switching tube Q2; the resistor R10 samples the working currents of the first high-side switching tube Q1 and the first low-side switching tube Q2, so as to obtain a signal Vs; vs is subjected to resistance-capacitance filtering to obtain a stable direct current sampling signal Vs _1, and then is amplified by a proportional amplifier U3A to obtain a signal Vs _ 2; vs _2 passes through D4, C6 and R11 to obtain a signal Vs _ 3. Vs _3 gets the circuit protection signal Vd via the comparator U3B.
Specifically, a driving signal PWM 1 generated by an external circuit passes through the half-bridge driving chip U1 to generate a first high-side driving signal PWM-H and a first low-side driving signal PWM-L for driving the first high-side switch Q1 and the first low-side switch Q2, respectively. The chip U1 can set the dead time of PWM-H and PWM-L to prevent the switch tube from being damaged. Because the driving current of the half-bridge driving chip U1 is limited, the signals PWM-H and PWM-L are amplified by the power driving chip U2 to generate switching tube driving signals PWM-H _1 and PWM-L _1 for directly driving the switching tubes. The working current of the switching tube is sampled through a resistor R10, a signal Vs can be obtained, the signal Vs is subjected to resistance-capacitance filtering to obtain a stable direct current sampling signal Vs _1, and then the signal Vs _2 is obtained through amplification of a proportional amplifier U3A. Vs _2 passes through D4, C6 and R11 to obtain a signal Vs _ 3. Vs _3 gets the circuit protection signal Vd via the comparator U3B. The D4 has the functions of preventing current backflow and ensuring protection time; c6 and R11 are used for configuring protection time; u3b, R7, R12, R13, R15 and R16 realize the protection function of bringing back difference.
The second set of half-bridge circuits is identical in structure and principle to the first set of half-bridge circuits. The second half-bridge driving unit is a half-bridge driving chip U4; the second power driving unit is a power driving chip U5; the second high-side switching tube is a second high-side switching tube Q3; the second low-side switching tube is a second low-side switching tube Q4; the second sampling resistor is a resistor R26; the second resistance-capacitance filter is R22 and C12 which are connected with R26 in parallel; the second proportional amplifier is a proportional amplifier U6A; the second protection time configuration unit comprises a D8 connected with the output end of the proportional amplifier U6A, and a C13 and an R27 respectively connected with D8 in series; c13 and R27 are connected in parallel and used for configuring protection time; the second protection signal feedback unit comprises U6B, R23, R28, R29, R31 and R32; wherein R28 is connected between the positive input end and the output end of U6B, R23 is connected between the output end of U6B and voltage VCC, R29 and R31 are connected in series between the positive input end of U6B and voltage VCC, and R32 is connected between R29 and ground.
The full-bridge driving device has better load carrying capacity, reduces energy loss, and can better protect a switching tube by adopting return difference control.
The invention also provides a full-bridge driving method, and the full-bridge driving device can implement the full-bridge driving method of the invention, but the implementation device of the full-bridge driving method of the invention includes, but is not limited to, the structure of the full-bridge driving device recited in the embodiment, and all structural modifications and substitutions of the prior art made according to the principle of the invention are included in the protection scope of the invention.
The protection scope of the full-bridge driving method according to the present invention is not limited to the execution sequence of the steps listed in this embodiment, and all the schemes of adding, subtracting, and replacing steps in the prior art according to the principles of the present invention are included in the protection scope of the present invention.
Referring to fig. 4, the full-bridge driving method includes: and driving an ultrasonic transducer by the first driving signal output by the first half-bridge driving module and the second driving signal output by the second half-bridge driving module.
Referring to fig. 1, the first half-bridge driving module 110 includes a first half-bridge driving unit 111, a first power driving unit 112, and a first return-difference protection unit 113. The first half bridge driving unit 111 converts a first driving pulse signal inputted from the outside into a first high side driving signal and a first low side driving signal. The first power driving unit 112 is connected to the first half-bridge driving unit 111, and amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive the first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive the first low-side switching tube. The first return difference protection unit 113 collects a first working current signal of the first high-side switching tube or the first low-side switching tube, converts the first working current signal into a first return difference protection signal, transmits the first return difference protection signal to the first half-bridge driving unit, and controls the return difference of the first half-bridge driving unit; the first working current signal is the first driving signal.
The second half-bridge driving module 120 includes: a second half-bridge driving unit 121, a second power driving unit 122, and a second return difference protection unit 123. The second half-bridge driving unit 121 converts a second driving pulse signal input from the outside into a second high-side driving signal and a second low-side driving signal. The second power driving unit 122 is connected to the second half-bridge driving unit 121, and amplifies the second high-side driving signal into a second high-side switching tube driving signal to drive the second high-side switching tube, and amplifies the second low-side driving signal into a second low-side switching tube driving signal to drive the second low-side switching tube. The second return difference protection unit 123 collects a second working current signal of the second high-side switching tube or the second low-side switching tube, converts the second working current signal into a second return difference protection signal, and transmits the second return difference protection signal to the second half-bridge driving unit to control the return difference of the second half-bridge driving unit; the second working current signal is the second driving signal.
Referring to fig. 5, the operating method of the first flyback protection unit includes:
s501, collecting a first working current signal of the first high-side switching tube or the first low-side switching tube by using a first sampling resistor arranged between the output end of the first low-side switching tube and the ground; the output end of the first high-side switching tube is connected with the output end of the first low-side switching tube in series;
s502, filtering the first working current by using a first resistance-capacitance filter connected with the first sampling resistor in parallel, and outputting a stable first direct current sampling signal;
s503, amplifying the first dc sampled signal by using a first proportional amplifier connected to an output terminal of the first rc filter;
s504, transmitting the first return difference protection signal to the first half-bridge driving unit by using a first protection circuit connected to an output terminal of the first proportional amplifier; the first protection circuit comprises a first protection time configuration unit and a first protection signal feedback unit; a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier, and an output end of the first protection signal feedback unit is connected with a protection input end of the first half-bridge driving unit; the first protection time configuration unit is connected between the first input end and the second input end of the first protection signal feedback unit.
Referring to fig. 6, the operating method of the second return difference protection unit includes:
s601, collecting a second working current signal of the second high-side switching tube or the second low-side switching tube by using a second sampling resistor arranged between the output end of the second low-side switching tube and the ground; the output end of the second high-side switching tube is connected with the output end of the second low-side switching tube in series;
s602, filtering the second working current by using a second resistance-capacitance filter connected in parallel with the second sampling resistor, and outputting a stable second direct current sampling signal;
s603, amplifying the second direct current sampling signal by using a second proportional amplifier connected with the output end of the second resistance-capacitance filter;
s604, transmitting the second return difference protection signal to the second half-bridge driving unit by using a second protection circuit connected to an output terminal of the second proportional amplifier; the second protection circuit comprises a second protection time configuration unit and a second protection signal feedback unit; a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier, and an output end of the second protection signal feedback unit is connected with a protection input end of the second half-bridge driving unit; the second protection time configuration unit is connected between the first input end and the second input end of the second protection signal feedback unit.
The full-bridge driving device or the method can be applied to the ultrasonic transducer to realize the full-bridge driving of the ultrasonic transducer, and the protection time in the driving process can be flexibly set, and simultaneously, the full-bridge driving device or the full-bridge driving method also has the power protection function with the return difference.
The embodiment of the invention also provides an ultrasonic transducer, wherein the ultrasonic transducer is driven by the first driving signal or the second driving signal output by the full-bridge driving device.
The embodiment of the invention also provides an ultrasonic system which comprises the full-bridge driving device. The ultrasonic system can be an ultrasonic surgical system, such as an ultrasonic osteotome system, an ultrasonic suction scalpel system, an ultrasonic cutting hemostatic scalpel system, and the like, and further, the ultrasonic surgical system can further comprise a host, a handle electrically connected with the host, and a cutter installed at the front end of the handle, wherein the full-bridge driving device is arranged in the host, the ultrasonic transducer is arranged in the handle, a first driving signal or a second driving signal output by the full-bridge driving device drives the ultrasonic transducer, and the ultrasonic transducer converts electric energy into mechanical energy and transmits the mechanical energy to the cutter to treat tissues. Or the ultrasonic system is an ultrasonic testing system.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A full-bridge driving device is characterized in that: the full-bridge driving device comprises a first half-bridge driving module and a second half-bridge driving module; the first driving signal output by the first half-bridge driving module and the second driving signal output by the second half-bridge driving module drive an ultrasonic transducer to realize full-bridge driving of the ultrasonic transducer;
the first half-bridge drive module includes:
a first half bridge driving unit converting a first driving pulse signal inputted from the outside into a first high side driving signal and a first low side driving signal;
the first power driving unit is connected with the first half bridge driving unit, amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive a first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive a first low-side switching tube;
the first return difference protection unit is used for acquiring a first working current signal of the first high-side switching tube or the first low-side switching tube, converting the first working current signal into a first return difference protection signal, transmitting the first return difference protection signal to the first half-bridge driving unit and controlling the return difference of the first half-bridge driving unit; the first working current signal is the first driving signal;
the first return difference protection unit includes:
the first sampling resistor is arranged between the output end of the first low-side switching tube and the ground and is used for collecting a first working current signal of the first high-side switching tube or the first low-side switching tube; the output end of the first high-side switching tube is connected with the output end of the first low-side switching tube in series;
the first resistance-capacitance filter is connected with the first sampling resistor in parallel, carries out filtering processing on the first working current and outputs a stable first direct current sampling signal;
the first proportional amplifier is connected with the output end of the first resistance-capacitance filter and amplifies the first direct current sampling signal;
the first protection circuit is connected with the output end of the first proportional amplifier and transmits the first return difference protection signal to the first half-bridge driving unit;
the second half-bridge drive module includes:
a second half-bridge driving unit converting a second driving pulse signal inputted from the outside into a second high side driving signal and a second low side driving signal;
the second power driving unit is connected with the second half-bridge driving unit, amplifies the second high-side driving signal into a second high-side switching tube driving signal to drive a second high-side switching tube, and amplifies the second low-side driving signal into a second low-side switching tube driving signal to drive a second low-side switching tube;
the second return difference protection unit is used for acquiring a second working current signal of the second high-side switching tube or the second low-side switching tube, converting the second working current signal into a second return difference protection signal, transmitting the second return difference protection signal to the second half-bridge driving unit and controlling the return difference of the second half-bridge driving unit; the second working current signal is the second driving signal;
the second return difference protection unit includes:
the second sampling resistor is arranged between the output end of the second low-side switching tube and the ground and is used for collecting a second working current signal of the second high-side switching tube or the second low-side switching tube; the output end of the second high-side switching tube is connected with the output end of the second low-side switching tube in series;
the second resistance-capacitance filter is connected with the second sampling resistor in parallel, and is used for filtering the second working current and outputting a stable second direct current sampling signal;
the second proportional amplifier is connected with the output end of the second resistance-capacitance filter and amplifies the second direct current sampling signal;
and the second protection circuit is connected with the output end of the second proportional amplifier and transmits the second return difference protection signal to the second half-bridge driving unit.
2. The full-bridge driving apparatus according to claim 1, wherein:
the first protection circuit comprises a first protection time configuration unit and a first protection signal feedback unit; a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier, and an output end of the first protection signal feedback unit is connected with a protection input end of the first half-bridge driving unit; the first protection time configuration unit is connected between the first input end and the second input end of the first protection signal feedback unit.
3. The full-bridge driving apparatus according to claim 2, wherein: and a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier through a diode, so that current backflow is prevented.
4. The full-bridge driving apparatus according to claim 1, wherein:
the second protection circuit comprises a second protection time configuration unit and a second protection signal feedback unit; a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier, and an output end of the second protection signal feedback unit is connected with a protection input end of the second half-bridge driving unit; the second protection time configuration unit is connected between the first input end and the second input end of the second protection signal feedback unit.
5. The full-bridge driving apparatus according to claim 4, wherein: and a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier through a diode, so that current backflow is prevented.
6. A full-bridge driving method, comprising:
driving an ultrasonic transducer by a first driving signal output by a first half-bridge driving module and a second driving signal output by a second half-bridge driving module so as to realize full-bridge driving of the ultrasonic transducer; wherein the content of the first and second substances,
the first half-bridge drive module includes:
a first half bridge driving unit converting a first driving pulse signal inputted from the outside into a first high side driving signal and a first low side driving signal;
the first power driving unit is connected with the first half bridge driving unit, amplifies the first high-side driving signal into a first high-side switching tube driving signal to drive a first high-side switching tube, and amplifies the first low-side driving signal into a first low-side switching tube driving signal to drive a first low-side switching tube;
the first return difference protection unit is used for acquiring a first working current signal of the first high-side switching tube or the first low-side switching tube, converting the first working current signal into a first return difference protection signal, transmitting the first return difference protection signal to the first half-bridge driving unit and controlling the return difference of the first half-bridge driving unit; the first working current signal is the first driving signal;
the second half-bridge drive module includes:
a second half-bridge driving unit converting a second driving pulse signal inputted from the outside into a second high side driving signal and a second low side driving signal;
the second power driving unit is connected with the second half-bridge driving unit, amplifies the second high-side driving signal into a second high-side switching tube driving signal to drive a second high-side switching tube, and amplifies the second low-side driving signal into a second low-side switching tube driving signal to drive a second low-side switching tube;
the second return difference protection unit is used for acquiring a second working current signal of the second high-side switching tube or the second low-side switching tube, converting the second working current signal into a second return difference protection signal, transmitting the second return difference protection signal to the second half-bridge driving unit and controlling the return difference of the second half-bridge driving unit; the second working current signal is the second driving signal;
the working method of the first return difference protection unit comprises the following steps: acquiring a first working current signal of the first high-side switching tube or the first low-side switching tube by using a first sampling resistor arranged between the output end of the first low-side switching tube and the ground; the output end of the first high-side switching tube is connected with the output end of the first low-side switching tube in series; filtering the first working current by using a first resistance-capacitance filter connected with the first sampling resistor in parallel, and outputting a stable first direct current sampling signal; amplifying the first DC sampling signal by using a first proportional amplifier connected with the output end of the first resistance-capacitance filter; transmitting the first return difference protection signal to the first half-bridge driving unit by using a first protection circuit connected with an output end of the first proportional amplifier; and/or
The working method of the second return difference protection unit comprises the following steps: acquiring a second working current signal of the second high-side switching tube or the second low-side switching tube by using a second sampling resistor arranged between the output end of the second low-side switching tube and the ground; the output end of the second high-side switching tube is connected with the output end of the second low-side switching tube in series; filtering the second working current by using a second resistance-capacitance filter connected with the second sampling resistor in parallel, and outputting a stable second direct current sampling signal; amplifying the second direct current sampling signal by using a second proportional amplifier connected with the output end of the second resistance-capacitance filter; transmitting the second return difference protection signal to the second half-bridge drive unit using a second protection circuit connected to an output of the second proportional amplifier.
7. The full-bridge driving method according to claim 6, wherein:
the first protection circuit comprises a first protection time configuration unit and a first protection signal feedback unit; a first input end of the first protection signal feedback unit is connected with an output end of the first proportional amplifier, and an output end of the first protection signal feedback unit is connected with a protection input end of the first half-bridge driving unit; the first protection time configuration unit is connected between the first input end and the second input end of the first protection signal feedback unit.
8. The full-bridge driving method according to claim 6, wherein:
the second protection circuit comprises a second protection time configuration unit and a second protection signal feedback unit; a first input end of the second protection signal feedback unit is connected with an output end of the second proportional amplifier, and an output end of the second protection signal feedback unit is connected with a protection input end of the second half-bridge driving unit; the second protection time configuration unit is connected between the first input end and the second input end of the second protection signal feedback unit.
9. An ultrasonic transducer, characterized by: the ultrasonic transducer is driven by the first driving signal or the second driving signal output by the full-bridge driving device of any one of the claims 1 to 5.
10. An ultrasound system, characterized by: the ultrasound system comprises a full bridge driving apparatus as claimed in any one of claims 1 to 5.
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| CN108988681A (en) * | 2018-06-13 | 2018-12-11 | 广州汇专工具有限公司 | Ultrasonic transducer output control circuit |
| CN113252977B (en) * | 2021-06-25 | 2021-10-01 | 武汉半边天医疗技术发展有限公司 | Frequency searching circuit and frequency searching method of ultrasonic transducer |
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