CN213151908U - Dedicated high-power converter of electric motor car - Google Patents
Dedicated high-power converter of electric motor car Download PDFInfo
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- CN213151908U CN213151908U CN202020930619.3U CN202020930619U CN213151908U CN 213151908 U CN213151908 U CN 213151908U CN 202020930619 U CN202020930619 U CN 202020930619U CN 213151908 U CN213151908 U CN 213151908U
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- 238000004146 energy storage Methods 0.000 claims abstract description 34
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- 230000001629 suppression Effects 0.000 claims abstract description 13
- 230000001052 transient effect Effects 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 8
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The utility model discloses a special high-power converter for an electric vehicle, which comprises a main circuit, a control circuit and an output circuit, wherein the control circuit is electrically connected with the main circuit, and the output circuit is electrically connected with the control circuit; the main circuit comprises a power input end, a voltage division current limiting resistor, a fast recovery diode, an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor, an overcurrent detection resistor, a transient suppression diode, a power input filter capacitor and a control module. The utility model belongs to the technical field of the circuit, specifically a dedicated high-power converter of electric motor car, it is big to have output, and the power supply is sufficient, and voltage is stable, is difficult to burn characteristics such as load, can give all digital product power supplies, the power supply of charging and the on-vehicle LED display screen of electric motor car, very big satisfied user's pluralism demand, the effectual dedicated high-power converter effect of electric motor car on having solved present market is poor, and self structure is complicated, maintain comparatively inconvenient problem.
Description
Technical Field
The utility model belongs to the technical field of the circuit, specifically indicate a dedicated high-power converter of electric motor car.
Background
Some electric vehicle DC-DC power converters on the market do not have the function of outputting 5V, and users need to purchase the electric vehicle separately and change lines by professional personnel, so that the electric vehicle DC-DC power converters are expensive and troublesome; some converters have the function of outputting 5V, but have the defects of small output power, insufficient power supply, unstable voltage, incapability of driving a high-power load, easiness in burning the load and the like.
SUMMERY OF THE UTILITY MODEL
To the above situation, for overcoming prior art's defect, the utility model provides a dedicated high-power converter of electric motor car, it is big to have output, the power supply is sufficient, the voltage is stable, be difficult to burn characteristics such as load, can give all digital product power supplies, the power supply of charging and the on-vehicle LED display screen of electric motor car, very big demand that has satisfied user's pluralism, the effectual dedicated high-power converter effect of electric motor car on having solved present market is poor, and self structure is complicated, maintain comparatively inconvenient problem.
The utility model adopts the following technical scheme: the utility model relates to a special high-power converter for an electric vehicle, which comprises a main circuit, a control circuit and an output circuit, wherein the control circuit is electrically connected with the main circuit, and the output circuit is electrically connected with the control circuit; the main circuit comprises a power input end, a voltage division current-limiting resistor, a fast recovery diode, an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor, an overcurrent detection resistor, a transient suppression diode, a power input filter capacitor and a control module, wherein one path of the power input end is electrically connected with a VCC (voltage holding resistor) pin of the control module through the voltage division current-limiting resistor, so that starting voltage is provided for the control module, and stable +12V working voltage is output through the fast recovery diode; the other path of the power supply input end is electrically connected with an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor and an over-current detection resistor; the anode of the power input filter capacitor and the drain electrode of the NMOS tube are both connected with the anode of the power input end; the source electrode of the NMOS tube is connected with an over-current detection resistor and is connected with a control module through the over-current detection resistor, and is simultaneously connected with an energy storage inductor and a Schottky diode respectively, the Schottky diode is connected with one end of the energy storage inductor, and the other end of the energy storage inductor is connected with an output filter capacitor and a transient suppression diode respectively.
Further, the control module group comprises a 1 st pin OUTPUT, a 2 nd pin + VCC, a 3 rd pin ISENSE, a 4 th pin GROUND, a 5 th pin OUT +12V and a 6 th pin GND, the control circuit is provided with six terminals corresponding to the control module group to realize the connection of a main circuit and the control circuit, the control circuit is provided with a control chip, the control chip is arranged in the control module group and comprises a 1 st pin COMP, a 2 nd pin VFB, a 3 rd pin ISENSE, a 4 th pin RT/CT, a 5 th pin GROUND, a 6 th pin OUTPUT, a 7 th pin VCC and an 8 th pin VREF, and the OUTPUT circuit comprises a 1 st pin GND, a 2 nd pin FB, a 3 rd pin SW, a 4 th pin VIN.
Further, control circuit includes voltage stabilizing circuit, oscillation circuit and pulse output circuit, voltage stabilizing circuit includes voltage stabilizing module, voltage regulating resistor, opto-coupler and load resistance, voltage stabilizing circuit is connected with control chip's COMP foot and VFB foot, voltage stabilizing module provides 2.5V reference voltage for the VFB foot, when output voltage is low or when too high, voltage stabilizing module and voltage regulating resistor combined action provide sample voltage, control the pulse width that switches on of NMOS pipe after 2.5V reference voltage comparison in feedback and the VFB foot of control chip through the opto-coupler to make output voltage stable.
Further, two groups of voltage regulating resistors are arranged.
Furthermore, the oscillation circuit comprises a resistor and a capacitor, and the resistor and the capacitor are respectively connected with an RT-CT pin of the control chip.
Furthermore, the pulse output circuit is respectively connected with the grid electrode of the NMOS tube through a resistor to drive the NMOS tube to work, and when the NMOS tube is conducted, the output current is filtered by a filter capacitor to supply power to a load; when the load is short-circuited or exceeds the set maximum allowable current, the voltage of the ISENSE pin of the control chip rises, the OUTPUT pulse of the OUTPUT pin is adjusted through the control chip, the NMOS tube is cut off, the NMOS tube is protected from being damaged, and an overcurrent protection circuit is formed; when the NMOS tube is cut off, the energy storage inductor forms an energy storage circuit to convert magnetic energy into electric energy, the polarity of the electric energy is left negative and right positive, the Schottky diode is conducted to form a follow current circuit, and power is continuously supplied to the load, so that the load obtains smooth direct current; when the output voltage is higher than the set maximum allowable output voltage, the transient suppression diode is damaged by reverse breakdown to form an output overvoltage protection circuit; the output voltage of the converter is almost zero, so that the output circuit and the load are protected from being damaged.
Further, the energy storage inductor is an annular energy storage inductor.
Further, the output circuit is a 300KHz fixed frequency PWM step-down DC/DC control chip.
Further, the model of the control chip is YW/UTC 3845E.
Adopt above-mentioned structure the utility model discloses the beneficial effect who gains as follows: the utility model provides a dedicated high-power converter of electric motor car, it is big to have output, the power supply is sufficient, voltage is stable, be difficult to burn characteristics such as load, can give the power supply of all digital products, charge and the power supply of the on-vehicle LED display screen of electric motor car, very big demand that has satisfied the user pluralism, can convert the DC high voltage of electric motor car storage battery into DC12V low-voltage, convert DC12V low-voltage into the conversion mode of DC5V low-voltage again, the effectual dedicated high-power converter effect of electric motor car on having solved present market is poor, and self structure is complicated, maintain comparatively inconvenient problem.
Drawings
Fig. 1 is a circuit diagram of a main circuit of a high-power converter specially used for an electric vehicle according to the present invention;
FIG. 2 is a circuit diagram of a control circuit of a high-power converter specially used for an electric vehicle according to the present invention;
fig. 3 is a circuit diagram of the output circuit of the high-power converter dedicated for the electric vehicle of the present invention.
The U1 is a control chip, the U2 is an optocoupler, the U3 is a voltage stabilizing module, the U4 is a control module, the D1 is a fast recovery diode, the D2 is a transient suppression diode, the C1-C9 are capacitors, the V1 is an NMOS (N-channel metal oxide semiconductor) tube, the V2 is a Schottky diode, the L1 is an annular energy storage inductor, the R1 is a U1 starting resistor of the control chip, the R2 is an overcurrent detection resistor, and the R3-R10 are resistors.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-3, the special high-power converter for electric vehicles of the present invention comprises a main circuit, a control circuit and an output circuit, wherein the control circuit is electrically connected to the main circuit, and the output circuit is electrically connected to the control circuit; the main circuit comprises a power input end, a voltage division current-limiting resistor, a fast recovery diode, an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor, an overcurrent detection resistor, a transient suppression diode, a power input filter capacitor and a control module, wherein one path of the power input end is electrically connected with a VCC (voltage holding resistor) pin of the control module through the voltage division current-limiting resistor, so that starting voltage is provided for the control module, and stable +12V working voltage is output through the fast recovery diode; the other path of the power supply input end is electrically connected with an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor and an over-current detection resistor; the anode of the power input filter capacitor and the drain electrode of the NMOS tube are both connected with the anode of the power input end; the source electrode of NMOS pipe is connected and is passed through the detection resistance connection control module group that overflows with the detection resistance that overflows, connects energy storage inductance and schottky diode respectively simultaneously, schottky diode is connected with energy storage inductance's one end, output filter capacitor and transient state suppression diode are connected respectively to energy storage inductance's the other end.
The control module group comprises a 1 st pin OUTPUT, a 2 nd pin + VCC, a 3 rd pin ISENSE, a 4 th pin GROUND, a 5 th pin OUT +12V and a 6 th pin GND, the control circuit is provided with six terminals corresponding to the control module group to realize the connection of a main circuit and the control circuit, the control circuit is provided with a control chip, the control chip is arranged in the control module group and comprises a 1 st pin COMP, a 2 nd pin VFB, a 3 rd pin ISENSE, a 4 th pin RT/CT, a 5 th pin GROUND, a 6 th pin OUTPUT, a 7 th pin VCC and an 8 th pin VREF, and the OUTPUT circuit comprises a 1 st pin GND, a 2 nd pin FB, a 3 rd pin SW, a 4 th pin VIN and a 5 th pin VIN.
The control circuit comprises a voltage stabilizing circuit, an oscillating circuit and a pulse output circuit, wherein the voltage stabilizing circuit comprises a voltage stabilizing module, a voltage regulating resistor, an optical coupler and a load resistor, the voltage stabilizing circuit is connected with a COMP pin and a VFB pin of the control chip, the voltage stabilizing module provides 2.5V reference voltage for the VFB pin, when the output voltage is too low or too high, the voltage stabilizing module and the voltage regulating resistor jointly act to provide sampling voltage, and the conduction pulse width of the NMOS tube is controlled after the 2.5V reference voltage in the VFB pin of the control chip is compared through optical coupler feedback, so that the output voltage is stable.
The voltage regulating resistors are provided with two groups.
The oscillating circuit comprises a resistor and a capacitor, and the resistor and the capacitor are respectively connected with an RT-CT pin of the control chip.
The pulse output circuit is respectively connected with the grid electrode of the NMOS tube through a resistor to drive the NMOS tube to work, and when the NMOS tube is conducted, output current is filtered by a filter capacitor to supply power to a load; when the load is short-circuited or exceeds the set maximum allowable current, the voltage of the ISENSE pin of the control chip rises, the OUTPUT pulse of the OUTPUT pin is adjusted through the control chip, the NMOS tube is cut off, the NMOS tube is protected from being damaged, and an overcurrent protection circuit is formed; when the NMOS tube is cut off, the energy storage inductor forms an energy storage circuit to convert magnetic energy into electric energy, the polarity of the electric energy is left negative and right positive, the Schottky diode is conducted to form a follow current circuit, and power is continuously supplied to the load, so that the load obtains smooth direct current; when the output voltage is higher than the set maximum allowable output voltage, the transient suppression diode is damaged by reverse breakdown to form an output overvoltage protection circuit; the output voltage of the converter is almost zero, so that the output circuit and the load are protected from being damaged.
The energy storage inductor is an annular energy storage inductor.
The output circuit is a 300KHz fixed frequency PWM voltage reduction DC/DC control chip.
The model of the control chip is YW/UTC 3845E.
When the power supply is used specifically, 48-72V direct current is input to the power supply input end of the main circuit, one circuit of the direct current is connected with a 7 th pin of a control chip U1 through a control chip U1 starting resistor R1 to provide starting voltage for the control chip U1, after the control chip U1 starts a resistor R1, two capacitors C1 and C5 which are connected in parallel are connected, filtering is performed on the power supply entering the control chip U1, the positive electrode of a capacitor C4 is connected with the cathode of a fast recovery diode D1, the anode of the fast recovery diode D1 is connected with the voltage of about +12V, the cathode outputs the voltage of about +12V, and stable working voltage is provided for the control chip U1; the power input end is also connected with the anode of an input power filter capacitor C2 and the drain of an NMOS tube V1, and the cathode of the power filter capacitor C2 is grounded; the gate of the NMOSV1 is connected with the 6 th pin of the U1 of the control chip through a resistor R3; the source of the NMOS transistor V1 is connected to the over-current detection resistor R2, and is connected to pin 3 of the control chip U1 through the over-current detection resistor R2, and is simultaneously connected to the energy storage inductor L1 and the cathode of the schottky diode V2, and the schottky diode V2 is connected to the energy storage inductor L1, and the other end of the energy storage inductor L1 is connected to the anode of the power output filter capacitor C3 and the cathode of the transient suppression diode D2; the cathode of the power supply output filter capacitor C3 and the anode of the transient suppression diode D2 are grounded; the 3 rd pin and the 8 th pin of the control chip U1 are connected, and an internal adjusting resistor R6 is arranged on the circuit; a loop is formed between the No. 3 pin and the No. 6 pin, and a resistor R4 and a capacitor C4 are connected in series on the loop; a capacitor C8 is arranged between the 1 st pin and the 2 nd pin of the control chip U1, and a capacitor C7 is arranged between the 2 nd pin and the 3 rd pin; a 1 st pin of the voltage stabilizing module U3 is connected with a voltage output end of the converter after being divided by voltage by the voltage regulating resistors R8 and R7, a 2 nd pin is grounded, a 3 rd pin provides 2.5V reference voltage for the 2 nd pin of the control chip U1 by the optocoupler U2, two pins of a light receiver of the optocoupler U2 are respectively connected with the 1 st pin and the 2 nd pin of the control chip U1, one pin of the light emitter is grounded by the resistor R9, and the other pin is respectively connected with the 3 rd pin of the capacitor C9 and the voltage stabilizing module U3; when the output voltage is too low or too high, the voltage stabilizing module U3 and the voltage regulating resistors R7 and R8 jointly act to provide sampling voltage, and the conduction pulse width of the NMOS tube V1 is controlled after the sampling voltage is fed back by the optocoupler U2 and compared with the 2.5V reference voltage in the 2 nd pin of the control chip U1, so that the output voltage is stable; the resistor R5 and the capacitor C6 form an oscillating circuit of the control chip U1 and are connected with the 4 th pin of the U1; the 6 th pin of the control chip U1 outputs pulses, which are respectively connected with the grid of the NMOS tube V1 through resistors R3 and R4 to drive the NMOS tube V1 to work, and when the NMOS tube V1 is switched on, the output current is filtered by a filter capacitor C3 through L1 to supply power to a load; when the load is short-circuited or exceeds the set maximum allowable current, the voltage of the pin 3 of the control chip U1 rises, the output pulse of the pin 6 is adjusted through the control chip U1, so that the NMOS tube V1 is cut off, the NMOS tube V1 is protected from being damaged, and an overcurrent protection circuit is formed; when the NMOS tube V1 is cut off, the energy storage inductor L1 forms an energy storage circuit, magnetic energy is converted into electric energy, the polarity of the electric energy is left negative, right positive, the Schottky diode V2 is conducted to form a follow current circuit, and power is continuously supplied to a load, so that the load obtains smooth direct current; when the output voltage is higher than the set maximum allowable output voltage, the transient suppression diode D2 is broken down in a reverse breakdown mode to form an output overvoltage protection circuit; the output voltage of the converter is almost zero, so that the output circuit and the load are protected from being damaged; after the 4 th pin and the 5 th pin of the 300KHz fixed frequency PWM step-down DC/DC control chip are short-circuited, the output end of a 12V DC-DC converter is accessed, the 4 th pin and the 5 th pin are also connected with the anodes of input filter capacitors C10 and C11, the negative electrode of the 4 th pin and the 5 th pin is connected with the 1 st pin of the 300KHz fixed frequency PWM step-down DC/DC control chip, the 1 st pin is grounded, the 2 nd pin of the 300KHz fixed frequency PWM step-down DC/DC control chip is respectively accessed into voltage regulating resistors R11 and R12, the other end of R11 is grounded, one end of the parallelly connected R12 and capacitor C12 is accessed into the 3 rd pin of the 300KHz fixed frequency PWM step-down DC/DC control chip through an energy storage inductor L2, D3 is accessed between the 3 rd pin and the 1 st pin, the negative electrode of D3 is connected with the 3 rd pin of U5, and the positive electrode of. The other end of the R12 and the capacitor C12 which are connected in parallel is connected with the anode of the output filter capacitor C13, and the cathode of the C13 is grounded. After the DC high voltage of electric motor car storage battery converts stable DC12V low-voltage into, output 300KHz fixed frequency PWM step-down DC/DC control chip starts work, through the regulation of 300KHz fixed frequency PWM step-down DC/DC control chip inner circuit, cooperation outlying input filter electric capacity C10 and C11, voltage regulation resistance R11, R12 and energy storage inductance L2 and output filter electric capacity C13's combined action, export stable DC5V low-voltage, it is above that the utility model discloses holistic work flow, repeat this step when using next time can.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (9)
1. A special high-power converter for an electric vehicle is characterized in that: the control circuit is electrically connected with the main circuit, and the output circuit is electrically connected with the control circuit; the main circuit comprises a power input end, a voltage division current limiting resistor, a fast recovery diode, an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor, an overcurrent detection resistor, a transient suppression diode, a power input filter capacitor and a control module, wherein one path of the power input end is electrically connected with a VCC (voltage holding resistor) pin of the control module through the voltage division current limiting resistor; the other path of the power supply input end is electrically connected with an NMOS (N-channel metal oxide semiconductor) tube, a filter capacitor, a Schottky diode, an energy storage inductor and an over-current detection resistor; the anode of the power input filter capacitor and the drain electrode of the NMOS tube are both connected with the anode of the power input end; the source electrode of the NMOS tube is connected with an over-current detection resistor and is connected with a control module through the over-current detection resistor, and is simultaneously connected with an energy storage inductor and a Schottky diode respectively, the Schottky diode is connected with one end of the energy storage inductor, and the other end of the energy storage inductor is connected with an output filter capacitor and a transient suppression diode respectively.
2. The high power converter as claimed in claim 1, wherein: the control module group comprises a 1 st pin OUTPUT, a 2 nd pin + VCC, a 3 rd pin ISENSE, a 4 th pin GROUND, a 5 th pin OUT +12V and a 6 th pin GND, the control circuit is provided with six terminals corresponding to the control module group to realize the connection of a main circuit and the control circuit, the control circuit is provided with a control chip, the control chip is arranged in the control module group and comprises a 1 st pin COMP, a 2 nd pin VFB, a 3 rd pin ISENSE, a 4 th pin RT/CT, a 5 th pin GROUND, a 6 th pin OUTPUT, a 7 th pin VCC and an 8 th pin VREF, and the OUTPUT circuit comprises a 1 st pin GND, a 2 nd pin FB, a 3 rd pin SW, a 4 th pin VIN and a 5 th pin VIN.
3. The high-power converter as claimed in claim 2, wherein: the control circuit comprises a voltage stabilizing circuit, an oscillating circuit and a pulse output circuit, wherein the voltage stabilizing circuit comprises a voltage stabilizing module, a voltage regulating resistor, an optical coupler and a load resistor, and the voltage stabilizing circuit is connected with a COMP pin and a VFB pin of the control chip.
4. The high-power converter as claimed in claim 3, wherein: the voltage regulating resistors are provided with two groups.
5. The high-power converter special for electric vehicles according to claim 4, wherein: the oscillating circuit comprises a resistor and a capacitor, and the resistor and the capacitor are respectively connected with an RT-CT pin of the control chip.
6. The high-power converter special for electric vehicles according to claim 5, wherein: the pulse output circuit is connected with the grid electrode of the NMOS tube through a resistor.
7. The high-power converter as claimed in claim 6, wherein: the energy storage inductor is an annular energy storage inductor.
8. The high power converter as claimed in claim 7, wherein: the output circuit is a 300KHz fixed frequency PWM voltage reduction DC/DC control chip.
9. The high power converter as claimed in claim 8, wherein: the model of the control chip is YW/UTC 3845E.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020930619.3U CN213151908U (en) | 2020-05-28 | 2020-05-28 | Dedicated high-power converter of electric motor car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020930619.3U CN213151908U (en) | 2020-05-28 | 2020-05-28 | Dedicated high-power converter of electric motor car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213151908U true CN213151908U (en) | 2021-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020930619.3U Expired - Fee Related CN213151908U (en) | 2020-05-28 | 2020-05-28 | Dedicated high-power converter of electric motor car |
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| Country | Link |
|---|---|
| CN (1) | CN213151908U (en) |
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2020
- 2020-05-28 CN CN202020930619.3U patent/CN213151908U/en not_active Expired - Fee Related
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Granted publication date: 20210507 |