CN116093884A - Overcurrent protection circuit of power circuit and electronic equipment - Google Patents
Overcurrent protection circuit of power circuit and electronic equipment Download PDFInfo
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- CN116093884A CN116093884A CN202310081252.0A CN202310081252A CN116093884A CN 116093884 A CN116093884 A CN 116093884A CN 202310081252 A CN202310081252 A CN 202310081252A CN 116093884 A CN116093884 A CN 116093884A
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- 238000005070 sampling Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000012545 processing Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 claims 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000001960 triggered effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- Engineering & Computer Science (AREA)
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to the technical field of electronic circuits, in particular to an overcurrent protection circuit of a power circuit and electronic equipment, comprising: the differential signal sampling circuit, the overcurrent signal trigger circuit and the overcurrent protection control circuit are connected in sequence; the overcurrent protection control circuit comprises an overcurrent protection self-locking circuit, an overcurrent protection detection circuit and an overcurrent protection enabling and resetting circuit. The invention completes the intelligent overcurrent protection through the discrete device, solves the problems that the traditional overcurrent protection scheme can not realize high interference resistance, low cost and the like by utilizing the discrete device at the same time, can not avoid repeated triggering of overcurrent protection actions, improves the interference resistance, reduces the hardware cost, has the delay protection function, and is safe, reliable and convenient to use.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to an overcurrent protection circuit for a power circuit and an electronic device.
Background
With the rapid development of electronic devices, at present, the electronic device industry is mainly divided into the following two types of overcurrent protection schemes: .
The first scheme is as follows: the actions such as current signal acquisition, differential sampling, trigger protection and the like are completed through the discrete devices, so that overcurrent protection is realized, the specific circuit structure of the design scheme is shown in figure 1, and the working principle is as follows: the sampling end performs signal acquisition, then outputs voltage after a signal method, compares the voltage with a protection threshold voltage, outputs a corresponding protection signal, and outputs a low level signal when the protection is not triggered by the circuit.
The second scheme is as follows: integrating the functions of the first scheme in a chip integration mode, and completing the reporting of fault information; although the design scheme integrates partial overcurrent protection function, the adjustable parameters are few, basically set by the chip factory, the requirements of user products cannot be well matched, the chip type selection is difficult, and the cost is high.
Disclosure of Invention
The invention aims to provide an overcurrent protection circuit of a power circuit and electronic equipment, so that the intelligent overcurrent protection is realized by utilizing discrete devices, the anti-interference performance is improved, the repeated triggering protection is avoided, and the hardware cost is reduced.
In order to solve the technical problems, the invention provides an overcurrent protection circuit of a power circuit and electronic equipment.
In a first aspect, the present invention provides an overcurrent protection circuit of a power circuit, the overcurrent protection circuit comprising: the differential signal sampling circuit, the overcurrent signal trigger circuit and the overcurrent protection control circuit are connected in sequence; the overcurrent protection control circuit comprises an overcurrent protection self-locking circuit, an overcurrent protection detection circuit and an overcurrent protection enabling and resetting circuit;
the differential signal sampling circuit is used for amplifying the acquired differential signals and outputting differential amplified signals to the overcurrent signal triggering circuit;
the overcurrent signal trigger circuit is used for carrying out delay processing according to the received differential amplification signals, generating delay protection signals, judging whether to trigger overcurrent protection according to the delay protection signals, and respectively outputting corresponding overcurrent protection voltage signals to the overcurrent protection control circuit under different overcurrent protection trigger states;
the overcurrent protection self-locking circuit is used for judging whether signal self-locking operation is carried out according to the received overcurrent protection voltage signal and outputting a self-locking voltage signal after the signal self-locking operation is adopted;
the overcurrent protection detection circuit is connected with the output end of the MCU and is used for outputting the received overcurrent protection voltage signal to the output end of the MCU outwards so that the MCU performs overcurrent protection triggering detection, generates a triggering detection signal, and controls the voltage of the input end of the MCU according to the triggering detection signal and the overcurrent protection release signal to finish the reset operation of the overcurrent protection circuit;
the over-current protection enabling and resetting circuit is connected with the input end of the MCU, and is used for outputting a circuit enabling signal according to a voltage signal of the input end of the MCU and controlling the working state of the over-current protection circuit according to the circuit enabling signal.
In a further embodiment, the differential signal sampling circuit comprises a differential amplifier.
In a further embodiment, the over-current signal trigger circuit includes a first resistor, a second resistor, a third resistor, a first capacitor, and a comparator;
one end of the first resistor is connected with the output end of the differential signal sampling circuit, the other end of the first resistor is connected with the non-inverting input end of the comparator and one end of the first capacitor, and the other end of the first capacitor is grounded;
the inverting input end of the comparator is connected with a power supply through the second resistor, and the inverting input end of the comparator is grounded through a third resistor.
In a further embodiment, the delay processing has a calculation formula:
wherein t represents a delay time; r represents the resistance value of the first resistor; c represents the capacitance value of the first capacitor; v (V) a A target voltage value representing the first capacitance; v (V) 0 Representing an initial voltage value of the first capacitor; v (V) t Representing the instantaneous voltage value of the first capacitor at a certain moment.
In a further embodiment, the over-current protection self-locking circuit comprises a second capacitor, a fourth resistor and a zener diode;
the output end of the comparator is connected to the non-inverting input end of the comparator through the fourth resistor and the zener diode which are connected in series, and the fourth resistor and the zener diode are connected with the second capacitor in parallel.
In a further embodiment, the over-current protection detection circuit includes a fifth resistor and a sixth resistor;
the output end of the comparator outputs a short circuit output signal through the fifth resistor; the output end of the comparator is also connected with the output end of the MCU through a sixth resistor.
In a further embodiment, the over-current protection enabling and resetting circuit comprises a MOS tube, a seventh resistor and an eighth resistor;
the input end of the MCU is connected to the grid electrode of the MOS tube through the seventh resistor, the source electrode of the MOS tube is connected with a power supply, and the drain electrode of the MOS tube is connected with the non-inverting input end of the comparator;
the eighth resistor is connected in parallel between the grid electrode and the source electrode of the MOS tube.
In a further embodiment, the differential signal sampling circuit includes a bi-directional current shunt monitor connected to the over-current signal trigger circuit and a ninth resistor connected to the bi-directional current shunt monitor.
In a second aspect, the present invention provides an electronic device, including the above-mentioned overcurrent protection circuit.
The invention provides an overcurrent protection circuit of a power circuit and electronic equipment, wherein the overcurrent protection circuit is used for carrying out delay processing on a differential amplified signal and judging whether overcurrent protection is triggered or not through a differential signal sampling circuit, an overcurrent signal triggering circuit and an overcurrent protection control circuit which are sequentially connected, and respectively outputting corresponding overcurrent protection voltage signals to the overcurrent protection control circuit under different overcurrent protection triggering states; the overcurrent protection control circuit is used for realizing the functions of overcurrent protection, self locking, enabling, resetting and the like. Compared with the prior art, the invention enhances the disturbance rejection of the over-current signal triggering on the basis of realizing the intelligent over-current protection by adopting the discrete device, greatly reduces the hardware cost, can perform delay protection setting, meets more product requirements, ensures more flexible design and realizes better over-current protection effect.
Drawings
FIG. 1 is a schematic diagram of a conventional over-current protection circuit provided in the background of the invention;
FIG. 2 is a schematic diagram of an over-current protection circuit of a power circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an overcurrent protection circuit of a power circuit according to another embodiment of the present invention.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the invention, including the drawings for reference and description only, and are not to be construed as limiting the scope of the invention as many variations thereof are possible without departing from the spirit and scope of the invention.
Referring to fig. 2, an embodiment of the present invention provides an overcurrent protection circuit of a power circuit, as shown in fig. 2, the overcurrent protection circuit includes a differential signal sampling circuit 11, an overcurrent signal triggering circuit 12, and an overcurrent protection control circuit which are sequentially connected; the overcurrent protection control circuit comprises an overcurrent protection self-locking circuit 13, an overcurrent protection detection circuit 14 and an overcurrent protection enabling and resetting circuit 15.
In this embodiment, the differential signal sampling circuit 11 is configured to amplify the collected differential signal, and output a differential amplified signal to the overcurrent signal triggering circuit 12;
the over-current signal triggering circuit 12 is configured to perform delay processing according to the received differential amplified signal, generate a delay protection signal, determine whether to trigger over-current protection according to the delay protection signal, and respectively output corresponding over-current protection voltage signals to the over-current protection control circuit in different over-current protection triggering states;
the over-current protection self-locking circuit 13 is configured to determine whether to perform signal self-locking operation according to the received over-current protection voltage signal, and output a self-locking voltage signal after performing signal self-locking operation;
the over-current protection detection circuit 14 is connected to the output end of the MCU, and is configured to output the received over-current protection voltage signal to the output end of the MCU, so that the MCU performs over-current protection trigger detection, generates a trigger detection signal, and controls the voltage of the input end of the MCU according to the trigger detection signal and the over-current protection release signal, so as to complete the reset operation of the over-current protection circuit;
the overcurrent protection enabling and resetting circuit 15 is connected to the input end of the MCU, and is configured to output a circuit enabling signal according to a voltage signal of the input end of the MCU, and control an operating state of the overcurrent protection circuit according to the circuit enabling signal.
In one embodiment, as shown in fig. 2, the differential signal sampling circuit 11 includes a differential amplifier U1A, wherein a non-inverting input terminal and an inverting input terminal of the differential amplifier are used for collecting the differential signal, and an output terminal of the differential amplifier is used for outputting the differential amplified signal V1 amplified by a certain proportion + And differentially amplifies the signal V1 + Output to the overcurrent signal trigger circuitA way 12.
The over-current signal trigger circuit comprises a first resistor R3, a second resistor R4, a third resistor R5, a first capacitor C3 and a comparator U1B, wherein one end of the first resistor R3 is connected with the output end of the differential signal sampling circuit 11, the other end of the first resistor R3 is connected with the non-inverting input end of the comparator U1B and one end of the first capacitor C3, and the other end of the first capacitor C3 is grounded; the inverting input end of the comparator U1B is connected with a power supply VCC through the second resistor R4, and the inverting input end of the comparator U1B is grounded GND through a third resistor R5.
In this embodiment, the first resistor R3 and the first capacitor C3 are used to form a delay trigger circuit, so that the over-current signal trigger circuit 12 receives the differential amplified signal V1 + And then, the delayed signals are input to the non-inverting input end of the comparator U1B through delay processing of the first resistor R3 and the first capacitor C3, wherein the calculation formula of the delay processing is as follows:
wherein t represents delay time in seconds; r represents the resistance value of the first resistor R3; c represents the capacitance value of the first capacitor C3; v (V) a Representing the target voltage value of the first capacitor C3, which, in this embodiment,
wherein VCC represents a power supply voltage value, R4 represents a resistance value of the second resistor R4, and R5 represents a resistance value of the third resistor R5; v (V) 0 An initial voltage value representing the first capacitance C3; v (V) t Representing the instantaneous voltage value of the first capacitor C3 at a certain moment.
The second resistor R4, the third resistor R5, the first capacitor C3 and the comparator U1B are used to form a trigger protection circuit, when the circuit does not trigger an overcurrent signal, if the voltage V1 at the inverting input terminal of the comparator U1B - A non-inverting input voltage V1 greater than the comparator U1B + When, i.e. V1 - >1B + When the output terminal voltage v2b=0v of the comparator U1B; when the circuit triggers the overcurrent signal, if the voltage V1 at the inverting input terminal of the comparator U1B - A non-inverting input voltage V1 less than the comparator U1B + When, i.e. V1 - <1B + When the output terminal voltage v2b=vcc of the comparator U1B, the output terminal voltage of the comparator U1B is at a high level, and the high level triggers the overcurrent protection signal; in the present embodiment, the voltage V1 at the non-inverting input terminal of the comparator U1B + Is determined according to the voltage output by the output end of the differential signal sampling circuit 11, and the voltage of the inverting input end of the comparator U1B
The over-current protection self-locking circuit 13 comprises a second capacitor C1, a fourth resistor R6 and a zener diode D1, wherein the output end of the comparator U1B is connected to the non-inverting input end of the comparator U1B through the fourth resistor R6 and the zener diode D1 which are connected in series, and the fourth resistor R6 and the zener diode D1 are connected in parallel with the second capacitor C1; in this embodiment, the second capacitor C1 is used to prevent signal interference, and when the voltage at the output end of the comparator U1B is v2b=vcc, a signal is fed back to the non-inverting input end of the comparator U1B through the fourth resistor R6 and the zener diode D1, so as to achieve self-locking.
The overcurrent protection detection circuit 14 includes a fifth resistor R7 and a sixth resistor R8, where the output end of the comparator U1B outputs a short-circuit output signal to the outside through the fifth resistor R7, so as to allow the hardware system to design flexibly; the Output end of the comparator U1B is further connected to the Output end mcu_io_output of the MCU through a sixth resistor R8, so that the Output end mcu_io_output of the MCU receives and detects the Output end voltage signal of the comparator U1B through the sixth resistor R8, and if it is detected that the Output end voltage signal of the comparator U1B is at a high level, it indicates that the overcurrent signal has been triggered.
The over-current protection enabling and resetting circuit 15 comprises a MOS tube Q1, a seventh resistor R1 and an eighth resistor R2, wherein the input end of the MCU is connected to the grid electrode of the MOS tube Q1 through the seventh resistor R1, the source electrode of the MOS tube Q1 is connected with a power supply VCC, and the drain electrode of the MOS tube Q1 is connected with the non-inverting input end of the comparator U1B; the eighth resistor R2 is connected in parallel between the gate and the source of the MOS transistor, and the MOS transistor Q1 is an N-channel MOS transistor.
The embodiment controls the on-off of the power supply of the differential signal sampling circuit and the overcurrent signal trigger circuit according to the voltage of the input end of the MCU, and specifically comprises the following steps: when the voltage of the Input end of the MCU is high, the MOS tube Q1 is cut off, the differential signal sampling circuit and the overcurrent signal trigger circuit have no power supply, and the whole overcurrent protection circuit does not work; when the voltage of the Input end of the MCU is in a low level, the MOS tube Q1 is conducted, the differential signal sampling circuit and the overcurrent signal triggering circuit are electrified, and the overcurrent protection circuit starts to work, so that the enabling function is realized.
In this embodiment, when the Output voltage signal mcu_io_output of the MCU is at a high level, the comparator U1B outputs a level v2b=vcc, and at this time, if the over-current protection is to be released, the Input level "mcu_io_input" of the MCU needs to be controlled to be changed from a low level (0V) to a high level (VCC) and then from the high level (VCC) to a low level (0V), thereby realizing the reset function.
In another embodiment, as shown in fig. 3, the differential signal sampling circuit includes a bi-directional current shunt monitor connected to the over-current signal trigger circuit and a ninth resistor R16 connected to the bi-directional current shunt monitor, where the bi-directional current shunt monitor uses an INA199A1DCKR chip U2, and the INA199A1DCKR chip U2 has the advantages of high integration, simplified circuit, improved reliability, etc., and at the same time, the INA199A1DCKR chip U2 has three fixed gains for selection: 50V/V (INA 199x 1), 100V/V (INA 199x 2), 200V/V (INA 199x 3), the preferred 50V/V gain of this embodiment; IN this embodiment, IN the main circuit of the differential signal sampling circuit, the ninth resistor R16 is connected IN series with the signal input in+ and IN-pins at two ends, and the 6_out pin outputs the amplified differential signal v1+ and outputs the differential amplified signal v1+ to the over-current signal trigger circuit 12, and it should be noted that the working principles and circuit structures of the subsequent over-current signal trigger circuit and the over-current protection control circuit are the same as those described above, and will not be described IN detail here.
In one embodiment, an embodiment of the present invention provides an electronic device, where the system includes the above-mentioned overcurrent protection circuit.
For specific limitations of an electronic device, reference may be made to the above-mentioned limitation of an overcurrent protection circuit for a power circuit, which is not repeated here.
According to the overcurrent protection circuit of the power circuit, the overcurrent trigger signal is locked by the overcurrent protection self-locking circuit, so that the condition that the protection action is repeatedly triggered under the overcurrent condition is avoided; based on the overcurrent protection enabling and resetting circuit, the circuit has the enabling and intelligent resetting functions of the overcurrent protection function; meanwhile, an overcurrent protection detection circuit is added, so that the system can identify the current circuit state. Compared with the traditional overcurrent protection scheme, the overcurrent protection circuit built based on the discrete device provided by the embodiment of the invention not only enhances the immunity triggered by an overcurrent signal and realizes the functions of delay protection, self-locking, reset and the like, but also avoids the selection of an integrated chip and greatly reduces the complexity of the system and the hardware cost.
The foregoing examples represent only a few preferred embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the invention. It should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and substitutions should also be considered to be within the scope of the present application. Therefore, the protection scope of the patent application is subject to the protection scope of the claims.
Claims (9)
1. An overcurrent protection circuit for a power circuit, comprising: the differential signal sampling circuit, the overcurrent signal trigger circuit and the overcurrent protection control circuit are connected in sequence; the overcurrent protection control circuit comprises an overcurrent protection self-locking circuit, an overcurrent protection detection circuit and an overcurrent protection enabling and resetting circuit;
the differential signal sampling circuit is used for amplifying the acquired differential signals and outputting differential amplified signals to the overcurrent signal triggering circuit;
the overcurrent signal trigger circuit is used for carrying out delay processing according to the received differential amplification signals, generating delay protection signals, judging whether to trigger overcurrent protection according to the delay protection signals, and respectively outputting corresponding overcurrent protection voltage signals to the overcurrent protection control circuit under different overcurrent protection trigger states;
the overcurrent protection self-locking circuit is used for judging whether signal self-locking operation is carried out according to the received overcurrent protection voltage signal and outputting a self-locking voltage signal after the signal self-locking operation is adopted;
the overcurrent protection detection circuit is connected with the output end of the MCU and is used for outputting the received overcurrent protection voltage signal to the output end of the MCU outwards so that the MCU performs overcurrent protection triggering detection, generates a triggering detection signal, and controls the voltage of the input end of the MCU according to the triggering detection signal and the overcurrent protection release signal to finish the reset operation of the overcurrent protection circuit;
the over-current protection enabling and resetting circuit is connected with the input end of the MCU, and is used for outputting a circuit enabling signal according to a voltage signal of the input end of the MCU and controlling the working state of the over-current protection circuit according to the circuit enabling signal.
2. The overcurrent protection circuit of claim 1, wherein: the differential signal sampling circuit includes a differential amplifier.
3. The overcurrent protection circuit of claim 1, wherein: the overcurrent signal trigger circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a comparator;
one end of the first resistor is connected with the output end of the differential signal sampling circuit, the other end of the first resistor is connected with the non-inverting input end of the comparator and one end of the first capacitor, and the other end of the first capacitor is grounded;
the inverting input end of the comparator is connected with a power supply through the second resistor, and the inverting input end of the comparator is grounded through a third resistor.
4. The overcurrent protection circuit of claim 3, wherein the delay processing has a calculation formula:
wherein t represents a delay time; r represents the resistance value of the first resistor; c represents the capacitance value of the first capacitor; v (V) a A target voltage value representing the first capacitance; v (V) 0 Representing an initial voltage value of the first capacitor; v (V) t Representing the instantaneous voltage value of the first capacitor at a certain moment.
5. The overcurrent protection circuit of claim 3, wherein: the overcurrent protection self-locking circuit comprises a second capacitor, a fourth resistor and a voltage stabilizing diode;
the output end of the comparator is connected to the non-inverting input end of the comparator through the fourth resistor and the zener diode which are connected in series, and the fourth resistor and the zener diode are connected with the second capacitor in parallel.
6. The overcurrent protection circuit of claim 3, wherein: the overcurrent protection detection circuit comprises a fifth resistor and a sixth resistor;
the output end of the comparator outputs a short circuit output signal through the fifth resistor; the output end of the comparator is also connected with the output end of the MCU through a sixth resistor.
7. The overcurrent protection circuit of claim 3, wherein: the overcurrent protection enabling and resetting circuit comprises an MOS tube, a seventh resistor and an eighth resistor;
the input end of the MCU is connected to the grid electrode of the MOS tube through the seventh resistor, the source electrode of the MOS tube is connected with a power supply, and the drain electrode of the MOS tube is connected with the non-inverting input end of the comparator;
the eighth resistor is connected in parallel between the grid electrode and the source electrode of the MOS tube.
8. The overcurrent protection circuit of claim 1, wherein: the differential signal sampling circuit comprises a bidirectional current shunt monitor connected with the overcurrent signal trigger circuit and a ninth resistor connected with the bidirectional current shunt monitor.
9. An electronic device, characterized in that: an overcurrent protection circuit comprising any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310081252.0A CN116093884A (en) | 2023-01-17 | 2023-01-17 | Overcurrent protection circuit of power circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310081252.0A CN116093884A (en) | 2023-01-17 | 2023-01-17 | Overcurrent protection circuit of power circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN116093884A true CN116093884A (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310081252.0A Pending CN116093884A (en) | 2023-01-17 | 2023-01-17 | Overcurrent protection circuit of power circuit and electronic equipment |
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| CN (1) | CN116093884A (en) |
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- 2023-01-17 CN CN202310081252.0A patent/CN116093884A/en active Pending
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