CN214315043U - Drive circuit and ultrasonic leather shoveling machine - Google Patents
Drive circuit and ultrasonic leather shoveling machine Download PDFInfo
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- CN214315043U CN214315043U CN202023205052.2U CN202023205052U CN214315043U CN 214315043 U CN214315043 U CN 214315043U CN 202023205052 U CN202023205052 U CN 202023205052U CN 214315043 U CN214315043 U CN 214315043U
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- 239000010985 leather Substances 0.000 title abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 93
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- 239000000919 ceramic Substances 0.000 claims description 37
- 239000003990 capacitor Substances 0.000 claims description 30
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Abstract
The utility model discloses a drive circuit and ultrasonic wave leather shoveling machine. A drive circuit, comprising: the series resonance module is connected with a fire wire end VCC; the first power conversion module can input a PWM1 signal, is electrically connected with the series resonance module, and is connected with a zero line (GND); the second power conversion module can input a PWM2 signal, is electrically connected with the series resonance module, can input a PWM2 signal, and is connected with a zero line (GND); wherein the PWM1 signal and the PWM2 signal are at the same frequency and complementary; and the sampling filter circuit module is electrically connected with the first electric energy conversion module and the second electric energy conversion module. The ultrasonic leather shaver comprises the driving circuit.
Description
Technical Field
The utility model relates to a circuit field especially relates to a drive circuit and ultrasonic wave leather shoveling machine.
Background
In the prior art, the piezoelectric ceramic piece is driven to vibrate by boosting through a secondary coil after an alternating current signal is generated by forcibly switching on and off a primary coil of a transformer, so that the problems of low electric energy conversion efficiency, large transformer size, high price and the like exist, and the improvement of the high electric energy conversion efficiency and the miniaturization of products are not facilitated.
The patent of the Chinese utility model with the publication number of CN209003957U discloses a skin measuring circuit, which comprises a control circuit, a power circuit, a skin measuring contact, a differential circuit and a signal processing circuit; the control circuit is electrically connected with the skin measuring contact and the signal processing circuit; the power supply circuit supplies power to the differential circuit and the signal processing circuit; the skin measuring contact is connected with the input end of the differential circuit, and the output end of the differential circuit is connected with the input end of the signal processing circuit; the skin measuring contact is used for the skin to be measured to contact so as to form skin impedance; the excitation signal sent by the control circuit forms a skin signal after passing through the skin impedance, the skin signal forms a spike pulse signal after being processed by the differentiating circuit, and the signal processing circuit converts the spike pulse signal into a direct current signal and outputs the direct current signal to the control circuit; the control circuit obtains the moisture and oil content test result of the human skin according to the direct current signal. The power circuit is provided with a first direct current output end, the shovel blade driving circuit comprises a driving switch and a transformer, the upper end of the primary side of the transformer is connected with the first direct current output end of the power circuit, the lower end of the primary side of the transformer is connected with the drain electrode of the driving switch, and the upper end and the lower end of the secondary side of the transformer are output ends of the shovel blade driving circuit; the grid electrode of the driving switch is the controlled end of the shovel skin driving circuit, and the source electrode of the driving switch is connected with the input end of the feedback circuit. The driving circuit in the skin measuring circuit provided by the technical scheme uses a transformer T1, and the primary coil of the transformer generates an alternating current signal by forcibly controlling a U2(NMOS tube) to be switched on and off, and then the alternating current signal is boosted by a secondary coil to drive the piezoelectric ceramic piece to vibrate. The transformer has large volume, so that the product has large volume and high manufacturing cost.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects and deficiencies existing in the prior art, the utility model provides a driving circuit and an ultrasonic leather shoveling machine with simple circuit structure, high electric energy conversion efficiency and low cost.
The utility model discloses a realize through following technical scheme:
the utility model discloses a drive circuit, include:
the series resonance module is connected with a fire wire end VCC;
the first power conversion module can input a PWM1 signal, is electrically connected with the series resonance module, and is connected with a zero line (GND);
the second power conversion module can input a PWM2 signal, is electrically connected with the series resonance module, can input a PWM2 signal, and is connected with a zero line (GND); wherein the PWM1 signal and the PWM2 signal are at the same frequency and complementary;
and the sampling filter circuit module is electrically connected with the first electric energy conversion module and the second electric energy conversion module.
The utility model discloses a drive circuit is through inputing PWM1 signal and PWM2 signal respectively at first electric energy conversion module and second electric energy conversion module, and complementary PWM1 signal and PWM2 signal are according to the resonant frequency timesharing break-make of series resonance module through first electric energy conversion module and second electric energy conversion module respectively, realize that whole circuit is in series resonance state at any time, and both whole circuit is in total impedance minimum state all the time, that is to say that the electric energy loss is minimum; in addition, by adding the sampling filter circuit module, the circuit can carry out real-time closed-loop processing and adjust the frequency of the PWM1 signal and the PWM2 signal, so that the circuit alternating current signal and the series resonance module are also in a resonance state, at the moment, the driving circuit can enable the electric energy conversion to be in the resonance state, the circuit alternating current signal and the series resonance module are also in the resonance state, and the energy conversion efficiency is high in the double resonance state.
In one embodiment, the series resonant module includes an inductor L1, an inductor L2, a capacitor C1, and a piezoelectric ceramic plate X1;
the high-voltage ends of the inductor L1 and the inductor L2 are both connected with the fire wire end VCC, the low-voltage ends of the inductor L1 and the inductor L2 are respectively connected with two ends of the capacitor C1, and the piezoelectric ceramic piece X1 is connected with two ends of the capacitor C1 in parallel;
the low-voltage end of the inductor L1 is electrically connected to the second power conversion module;
the low-voltage end of the inductor L2 is electrically connected to the first power conversion module.
Complementary PWM1 signals and PWM2 signals are switched on and off in a time-sharing mode according to the resonant frequency of the piezoelectric ceramic piece X1 through the first electric energy conversion module and the second electric energy conversion module respectively, when the PWM1 signals drive the first electric energy conversion module to be switched on, the PWM2 signals drive the second electric energy conversion module to be switched off, at the moment, the inductor L1, the capacitor C1 and the piezoelectric ceramic piece X1 form series resonance, the piezoelectric ceramic piece X1 obtains forward voltage, when the PWM1 signals drive the first electric energy conversion module to be switched off, the PWM1 signals drive the second electric energy conversion module to be switched on, at the moment, the inductor L2, the capacitor C1 and the piezoelectric ceramic piece X1 form series resonance, the piezoelectric ceramic piece X1 obtains reverse voltage, therefore, the piezoelectric ceramic piece X1 can obtain alternating sine wave voltage signals, and the piezoelectric ceramic piece X1 vibrates according to the frequency of the driving PWM1 signals and the PWM2 signals.
The series resonance module only needs two inductors with smaller volume and one capacitor, so that a transformer with large volume is eliminated, and the series resonance module has the advantages of small volume and low cost.
In one embodiment, the first power conversion module includes an NMOS transistor Q1, a resistor R1, and a resistor R3;
the drain D of the NMOS transistor Q1 is electrically connected to the low voltage terminal of the inductor L2, the source S thereof is electrically connected to the sampling filter circuit module, the gate G thereof is electrically connected to the resistor R1 and the resistor R3, the resistor R1 can input the PWM1 signal, and the resistor R3 is connected to the zero line terminal GND.
In one embodiment, the second power conversion module includes an NMOS transistor Q2, a resistor R2, and a resistor R4;
the drain D of the NMOS transistor Q2 is electrically connected to the low voltage terminal of the inductor L1, the source S thereof is electrically connected to the source S of the NMOS transistor Q1 and the sampling filter circuit module, the gate G thereof is electrically connected to the resistor R2 and the resistor R4, the resistor R2 can input the PWM1 signal, and the resistor R4 is connected to the zero line terminal GND.
The complementary PWM1 signal and PWM2 signal respectively control the NMOS tube Q1 and NMOS tube Q2 to press the resonant frequency of the piezoelectric ceramic piece X1 to be switched on and off in a time-sharing mode through a resistor R1, a resistor R3, a resistor R2 and a resistor R4, when the NMOS tube Q1 is driven to be switched on by the PWM1 signal, the NMOS tube Q2 is driven to be switched off by the PWM2 signal, at the moment, the inductor L2, the capacitor C2 and the piezoelectric ceramic piece X2 form series resonance, the piezoelectric ceramic piece X2 obtains forward voltage, when the NMOS tube Q2 is driven to be switched off by the PWM2 signal, the NMOS tube Q2 is driven to be switched on by the PWM2 signal, at the moment, the inductor L2, the capacitor C2 and the piezoelectric ceramic piece X2 form series resonance, the piezoelectric ceramic piece X2 obtains reverse voltage, so that the piezoelectric ceramic piece X2 can obtain alternate sine wave voltage signals, and according to the piezoelectric effect, the piezoelectric ceramic piece X2 vibrates according to the PWM signal 2.
In one embodiment, the sampling filter circuit module includes a resistor R5, a resistor R6, and a capacitor C2;
the resistor R5 and the resistor R6 are electrically connected with the source S of the NMOS transistor Q1 and the source S of the NMOS transistor Q2, the resistor R5 and the resistor R6 are respectively connected with two ends of the capacitor C2, and the resistor R6 and the capacitor C2 are connected with a zero line end GND.
According to the characteristics of the piezoceramic sheet X1, the resonant frequency of the piezoceramic sheet X1 can change along with the changes of temperature, load and service time, and if the frequencies of the PWM1 signal and the PWM2 signal are constant all the time, the resonant frequency of the piezoceramic sheet X1 is changed, so that the driving circuit is not matched with the resonant frequency of the piezoceramic sheet X1, and at the moment, the piezoceramic sheet X1 is not in a resonant state, and more energy is wasted. Aiming at the problem, a resistor R5, a resistor R6 and a capacitor C2 are adopted to form a sampling filter circuit module, the module can sample electrical parameter signals in real time during working, and the frequency of a PWM1 signal and the frequency of a PWM2 signal are adjusted after processing, so that closed-loop processing of the circuit is achieved, the piezoelectric ceramic piece X1 can work in a resonance state all the time, and the energy conversion efficiency is improved.
In an embodiment of the foregoing technical solution, the driving circuit further includes a PWM driving module, and the PWM driving module is electrically connected to the first power conversion module and the second power conversion module to input a PWM1 signal and a PWM signal, respectively. The PWM driving module is used for providing PWM1 signals and PWM signals for the first electric energy conversion module and the second electric energy conversion module.
The utility model discloses a drive circuit's beneficial effect:
the utility model discloses a drive circuit is through inputing PWM1 signal and PWM2 signal respectively at first electric energy conversion module and second electric energy conversion module, and complementary PWM1 signal and PWM2 signal are according to the resonant frequency timesharing break-make of series resonance module through first electric energy conversion module and second electric energy conversion module respectively, realize that whole circuit is in series resonance state at any time, and both whole circuit is in total impedance minimum state all the time, that is to say that the electric energy loss is minimum; in addition, by adding the sampling filter circuit module, the circuit can carry out real-time closed-loop processing and adjust the frequency of the PWM1 signal and the PWM2 signal, so that the circuit alternating current signal and the series resonance module are also in a resonance state, at the moment, the driving circuit can enable the electric energy conversion to be in the resonance state, the circuit alternating current signal and the series resonance module are also in the resonance state, and the energy conversion efficiency is high in the double resonance state. The utility model discloses a drive circuit has circuit structure simply, electric energy conversion efficiency is high, characteristics such as with low costs.
The utility model also provides an ultrasonic wave leather shoveling machine, including any one of the above-mentioned drive circuit.
The utility model discloses an ultrasonic wave leather shoveling machine's beneficial effect:
the utility model discloses an ultrasonic wave leather shoveling machine is through inputing PWM1 signal and PWM2 signal respectively at first electric energy conversion module and second electric energy conversion module, and complementary PWM1 signal and PWM2 signal are according to the resonant frequency timesharing break-make of series resonance module through first electric energy conversion module and second electric energy conversion module respectively, realize that whole circuit is in series resonance state at any time, both whole circuit is in total impedance minimum state all the time, that is to say electric energy loss is minimum; in addition, by adding the sampling filter circuit module, the circuit can carry out real-time closed-loop processing and adjust the frequency of the PWM1 signal and the PWM2 signal, so that the circuit alternating current signal and the series resonance module are also in a resonance state, at the moment, the driving circuit can enable the electric energy conversion to be in the resonance state, the circuit alternating current signal and the series resonance module are also in the resonance state, and the energy conversion efficiency is high in the double resonance state. The utility model discloses an ultrasonic wave leather shoveling machine has circuit structure simple, electric energy conversion efficiency is high, characteristics such as with low costs.
Drawings
Fig. 1 is a circuit diagram of a driving circuit according to a preferred embodiment of the present invention.
Detailed Description
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state thereof. Therefore, these and other directional terms should not be construed as limiting terms.
Referring to fig. 1, fig. 1 is a circuit diagram of a driving circuit according to a preferred embodiment of the present invention.
The utility model discloses a drive circuit, including series resonance module, can input the first electric energy conversion module of PWM1 signal, can input the second electric energy conversion module and the sampling filter circuit module of PWM2 signal.
The series resonance module is connected with a fire wire end VCC.
The first electric energy conversion module is electrically connected with the series resonance module and is connected with a zero line (GND).
The second electric energy conversion module is electrically connected with the series resonance module, the second electric energy conversion module can input a PWM2 signal, and the second electric energy conversion module is connected with a zero line (GND); wherein the PWM1 signal and the PWM2 signal are at the same frequency and complementary.
And the sampling filter circuit module is electrically connected with the first electric energy conversion module and the second electric energy conversion module.
The PWM1 signal and the PWM2 signal are respectively input into the first electric energy conversion module and the second electric energy conversion module, and the complementary PWM1 signal and the complementary PWM2 signal are respectively switched on and off in a time-sharing mode according to the resonance frequency of the series resonance module through the first electric energy conversion module and the second electric energy conversion module, so that the whole circuit is in a series resonance state at any time, namely the whole circuit is always in a minimum total impedance state, namely the electric energy loss is minimum; in addition, by adding the sampling filter circuit module, the circuit can carry out real-time closed-loop processing and adjust the frequency of the PWM1 signal and the PWM2 signal, so that the circuit alternating current signal and the series resonance module are also in a resonance state, at the moment, the driving circuit can enable the electric energy conversion to be in the resonance state, the circuit alternating current signal and the series resonance module are also in the resonance state, and the energy conversion efficiency is high in the double resonance state.
Specifically, the series resonance module comprises an inductor L1, an inductor L2, a capacitor C1 and a piezoceramic sheet X1.
The high voltage ends of the inductor L1 and the inductor L2 are connected with the fire wire end VCC, the low voltage ends of the inductor L1 and the inductor L2 are connected with the two ends of the capacitor C1 respectively, and the two ends of the piezoelectric ceramic piece X1 are connected in parallel with the two ends of the capacitor C1.
The low-voltage end of the inductor L1 is electrically connected to the second power conversion module.
The low-voltage end of the inductor L2 is electrically connected to the first power conversion module.
Complementary PWM1 signals and PWM2 signals are switched on and off in a time-sharing mode according to the resonant frequency of the piezoelectric ceramic piece X1 through the first electric energy conversion module and the second electric energy conversion module respectively, when the PWM1 signals drive the first electric energy conversion module to be switched on, the PWM2 signals drive the second electric energy conversion module to be switched off, at the moment, the inductor L1, the capacitor C1 and the piezoelectric ceramic piece X1 form series resonance, the piezoelectric ceramic piece X1 obtains forward voltage, when the PWM1 signals drive the first electric energy conversion module to be switched off, the PWM1 signals drive the second electric energy conversion module to be switched on, at the moment, the inductor L2, the capacitor C1 and the piezoelectric ceramic piece X1 form series resonance, the piezoelectric ceramic piece X1 obtains reverse voltage, therefore, the piezoelectric ceramic piece X1 can obtain alternating sine wave voltage signals, and the piezoelectric ceramic piece X1 vibrates according to the frequency of the driving PWM1 signals and the PWM2 signals.
The series resonance module only needs two inductors with smaller volume and one capacitor, so that a transformer with large volume is eliminated, and the series resonance module has the advantages of small volume and low cost.
Preferably, the first power conversion module includes an NMOS transistor Q1, a resistor R1, and a resistor R3.
The drain D of the NMOS transistor Q1 is electrically connected to the low voltage terminal of the inductor L2, the source S thereof is electrically connected to the sampling filter circuit module, the gate G thereof is electrically connected to the resistor R1 and the resistor R3, the resistor R1 can input the PWM1 signal, and the resistor R3 is connected to the zero line terminal GND.
Further, the second power conversion module includes an NMOS transistor Q2, a resistor R2, and a resistor R4.
The drain D of the NMOS transistor Q2 is electrically connected to the low voltage terminal of the inductor L1, the source S thereof is electrically connected to the source S of the NMOS transistor Q1 and the sampling filter circuit module, the gate G thereof is electrically connected to the resistor R2 and the resistor R4, the resistor R2 can input the PWM1 signal, and the resistor R4 is connected to the zero line terminal GND.
The complementary PWM1 signal and PWM2 signal respectively control the NMOS tube Q1 and NMOS tube Q2 to press the resonant frequency of the piezoelectric ceramic piece X1 to be switched on and off in a time-sharing mode through a resistor R1, a resistor R3, a resistor R2 and a resistor R4, when the NMOS tube Q1 is driven to be switched on by the PWM1 signal, the NMOS tube Q2 is driven to be switched off by the PWM2 signal, at the moment, the inductor L2, the capacitor C2 and the piezoelectric ceramic piece X2 form series resonance, the piezoelectric ceramic piece X2 obtains forward voltage, when the NMOS tube Q2 is driven to be switched off by the PWM2 signal, the NMOS tube Q2 is driven to be switched on by the PWM2 signal, at the moment, the inductor L2, the capacitor C2 and the piezoelectric ceramic piece X2 form series resonance, the piezoelectric ceramic piece X2 obtains reverse voltage, so that the piezoelectric ceramic piece X2 can obtain alternate sine wave voltage signals, and according to the piezoelectric effect, the piezoelectric ceramic piece X2 vibrates according to the PWM signal 2.
Preferably, the sampling filter circuit module comprises a resistor R5, a resistor R6 and a capacitor C2.
The resistor R5 and the resistor R6 are electrically connected with the source S of the NMOS transistor Q1 and the source S of the NMOS transistor Q2, the resistor R5 and the resistor R6 are respectively connected with two ends of the capacitor C2, and the resistor R6 and the capacitor C2 are connected with a zero line end GND.
According to the characteristics of the piezoceramic sheet X1, the resonant frequency of the piezoceramic sheet X1 can change along with the changes of temperature, load and service time, and if the frequencies of the PWM1 signal and the PWM2 signal are constant all the time, the resonant frequency of the piezoceramic sheet X1 is changed, so that the driving circuit is not matched with the resonant frequency of the piezoceramic sheet X1, and at the moment, the piezoceramic sheet X1 is not in a resonant state, and more energy is wasted. Aiming at the problem, a resistor R5, a resistor R6 and a capacitor C2 are adopted to form a sampling filter circuit module, the module can sample electrical parameter signals in real time during working, and the frequency of a PWM1 signal and the frequency of a PWM2 signal are adjusted after processing, so that closed-loop processing of the circuit is achieved, the piezoelectric ceramic piece X1 can work in a resonance state all the time, and the energy conversion efficiency is improved.
Further, the driving circuit further comprises a PWM driving module, and the PWM driving module is electrically connected to the first power conversion module and the second power conversion module to input a PWM1 signal and a PWM signal, respectively. The PWM driving module is used for providing PWM1 signals and PWM signals for the first electric energy conversion module and the second electric energy conversion module.
The utility model also provides an ultrasonic wave leather shoveling machine, include drive circuit.
The utility model discloses an ultrasonic wave leather shoveling machine can improve electric energy conversion efficiency through utilizing this drive circuit, improves product live time, is favorable to the product miniaturization, easily carries.
The utility model discloses a drive circuit and ultrasonic wave shovel skin machine's beneficial effect:
the utility model discloses an ultrasonic wave leather shoveling machine is through inputing PWM1 signal and PWM2 signal respectively at first electric energy conversion module and second electric energy conversion module, and complementary PWM1 signal and PWM2 signal are according to the resonant frequency timesharing break-make of series resonance module through first electric energy conversion module and second electric energy conversion module respectively, realize that whole circuit is in series resonance state at any time, both whole circuit is in total impedance minimum state all the time, that is to say electric energy loss is minimum; in addition, by adding the sampling filter circuit module, the circuit can carry out real-time closed-loop processing and adjust the frequency of the PWM1 signal and the PWM2 signal, so that the circuit alternating current signal and the series resonance module are also in a resonance state, at the moment, the driving circuit can enable the electric energy conversion to be in the resonance state, the circuit alternating current signal and the series resonance module are also in the resonance state, and the energy conversion efficiency is high in the double resonance state. The utility model discloses a drive circuit and ultrasonic wave shovel leather machine have circuit structure simple, electric energy conversion efficiency is high, characteristics such as with low costs.
The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.
Claims (7)
1. A driver circuit, comprising:
the series resonance module is connected with a fire wire end VCC;
the first power conversion module can input a PWM1 signal, is electrically connected with the series resonance module, and is connected with a zero line (GND);
the second power conversion module can input a PWM2 signal, is electrically connected with the series resonance module, can input a PWM2 signal, and is connected with a zero line (GND); wherein the PWM1 signal and the PWM2 signal are at the same frequency and complementary;
and the sampling filter circuit module is electrically connected with the first electric energy conversion module and the second electric energy conversion module.
2. The drive circuit according to claim 1, wherein: the series resonance module comprises an inductor L1, an inductor L2, a capacitor C1 and a piezoelectric ceramic piece X1;
the high-voltage ends of the inductor L1 and the inductor L2 are both connected with the fire wire end VCC, the low-voltage ends of the inductor L1 and the inductor L2 are respectively connected with two ends of the capacitor C1, and the piezoelectric ceramic piece X1 is connected with two ends of the capacitor C1 in parallel;
the low-voltage end of the inductor L1 is electrically connected to the second power conversion module;
the low-voltage end of the inductor L2 is electrically connected to the first power conversion module.
3. The drive circuit according to claim 2, wherein: the first power conversion module comprises an NMOS transistor Q1, a resistor R1 and a resistor R3;
the drain D of the NMOS transistor Q1 is electrically connected to the low voltage terminal of the inductor L2, the source S thereof is electrically connected to the sampling filter circuit module, the gate G thereof is electrically connected to the resistor R1 and the resistor R3, the resistor R1 can input the PWM1 signal, and the resistor R3 is connected to the zero line terminal GND.
4. The drive circuit according to claim 3, wherein: the second power conversion module comprises an NMOS transistor Q2, a resistor R2 and a resistor R4;
the drain D of the NMOS transistor Q2 is electrically connected to the low voltage terminal of the inductor L1, the source S thereof is electrically connected to the source S of the NMOS transistor Q1 and the sampling filter circuit module, the gate G thereof is electrically connected to the resistor R2 and the resistor R4, the resistor R2 can input the PWM1 signal, and the resistor R4 is connected to the zero line terminal GND.
5. The drive circuit according to claim 4, wherein: the sampling filter circuit module comprises a resistor R5, a resistor R6 and a capacitor C2;
the resistor R5 and the resistor R6 are electrically connected with the source S of the NMOS transistor Q1 and the source S of the NMOS transistor Q2, the resistor R5 and the resistor R6 are respectively connected with two ends of the capacitor C2, and the resistor R6 and the capacitor C2 are connected with a zero line end GND.
6. The drive circuit according to any one of claims 1 to 5, wherein: the driving circuit further comprises a PWM driving module, and the PWM driving module is electrically connected with the first electric energy conversion module and the second electric energy conversion module to respectively input a PWM1 signal and a PWM signal.
7. An ultrasonic skin scraper comprising the drive circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023205052.2U CN214315043U (en) | 2020-12-25 | 2020-12-25 | Drive circuit and ultrasonic leather shoveling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023205052.2U CN214315043U (en) | 2020-12-25 | 2020-12-25 | Drive circuit and ultrasonic leather shoveling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214315043U true CN214315043U (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023205052.2U Active CN214315043U (en) | 2020-12-25 | 2020-12-25 | Drive circuit and ultrasonic leather shoveling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214315043U (en) |
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2020
- 2020-12-25 CN CN202023205052.2U patent/CN214315043U/en active Active
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