CN210405133U - Motor drive circuit, motor and electrical equipment - Google Patents
Motor drive circuit, motor and electrical equipment Download PDFInfo
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- CN210405133U CN210405133U CN201921414822.9U CN201921414822U CN210405133U CN 210405133 U CN210405133 U CN 210405133U CN 201921414822 U CN201921414822 U CN 201921414822U CN 210405133 U CN210405133 U CN 210405133U
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Abstract
The application discloses motor drive circuit, motor and electrical equipment. A motor drive circuit comprising: the pulse suppression circuit comprises a driving module, a pulse suppression module, a bootstrap boosting module and a switch module, wherein the bootstrap boosting module is connected with the driving module; the driving module, the switch module and the pulse suppression module are respectively connected with a motor phase line connecting end; the bootstrap boosting module is used for boosting voltage for the driving module; the driving module is used for controlling the cut-off and the conduction of the switch module based on the boosted voltage so as to provide a driving signal for the phase line connecting end of the motor; and the pulse suppression module is used for suppressing spike pulse generated by the phase line connecting end of the motor when the switch module is switched on and switched off. Therefore, overvoltage breakdown of a bootstrap boost diode of a bootstrap boost module in the motor driving circuit and the like due to overlarge pulse amplitude is avoided, safety and reliability are improved, electromagnetic interference is reduced, and electromagnetic compatibility is improved.
Description
Technical Field
The application relates to the technical field of motors, in particular to a motor driving circuit, a motor and electrical equipment.
Background
Brushless dc motors have been widely used in electrical equipment such as air conditioners because of their advantages such as operating efficiency, low-speed torque, and rotational speed accuracy.
In the related art, be provided with the low pressure drive circuit who is connected with the phase line of motor among brushless motor's the control circuit, generally, low pressure drive circuit includes drive module, bootstrap boost module, first switch transistor, second switch transistor, wherein, first switch transistor and second switch transistor connection motor phase line link, bootstrap boost module includes bootstrap boost diode, bootstrap boost electric capacity, can promote drive module's output voltage, make drive module can drive first switch transistor and second switch transistor, and then driving motor. Because the existence of motor leakage inductance and switching device parasitic capacitance, in addition through the voltage that bootstrap booster circuit promoted, when the moment that switching transistor cut off and switched on, above-mentioned motor phase line link can produce spike pulse, on the one hand, punctures overvoltage such as the bootstrap boost diode in the bootstrap boost module very easily, leads to the circuit to become invalid, and fail safe nature is not high, and on the other hand still can cause strong electromagnetic interference to the external world.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a motor driving circuit, a motor and electrical equipment so as to solve the problem that spike pulses can be generated in the motor driving circuit in the related art.
The purpose of the application is realized by the following technical scheme:
a motor drive circuit comprising: the pulse suppression circuit comprises a driving module, a pulse suppression module, a bootstrap boosting module and a switch module, wherein the bootstrap boosting module is connected with the driving module; wherein the content of the first and second substances,
the driving module, the switch module and the pulse suppression module are respectively connected with a motor phase line connecting end;
the bootstrap boosting module is used for boosting voltage for the driving module;
the driving module is used for controlling the cut-off and the conduction of the switch module based on the boosted voltage so as to provide a driving signal for the phase line connecting end of the motor;
and the pulse suppression module is used for suppressing spike pulse generated by the phase line connecting end of the motor when the switch module is switched on and switched off.
Optionally, the pulse suppression module includes: an integrating circuit;
the integrating circuit is connected with the motor phase line connecting end and used for integrating the spike pulse generated by the motor phase line connecting end when the switch module is switched on and switched off so as to buffer the spike pulse.
Optionally, the integrating circuit includes a first resistor and a first capacitor;
the first end of the first resistor is connected with the motor phase line connecting end, and the second end of the first resistor is connected with the first end of the first capacitor;
the second end of the first capacitor is connected with a first power supply end; the first power supply end is grounded through the first filtering module.
Optionally, the pulse suppression module further includes: a discharge circuit and a first diode; the first diode is a Zener voltage stabilizing diode;
the cathode of the first diode is connected with the first end of the first capacitor, and the anode of the first diode is connected with the second end of the first capacitor;
the first end of the discharge circuit is connected with the first end of the first capacitor, and the second end of the discharge circuit is connected with the second end of the first capacitor;
the first diode is used for being broken down reversely when the spike pulse reaches a preset amplitude value so as to improve the voltage difference between two ends of the discharge circuit and enable the integration circuit to discharge through the discharge circuit.
Optionally, the discharge circuit includes a second resistor;
and the first end of the second resistor is connected with the first end of the first capacitor, and the second end of the second resistor is connected with the second end of the first capacitor.
Optionally, the switch module includes a first switch transistor, a second switch transistor, a third resistor, and a fourth resistor;
the grid electrode of the first switching transistor is connected with the high-side grid electrode driving output end of the driving module through a third resistor, the source electrode of the first switching transistor is connected with the first power supply end, and the drain electrode of the first switching transistor is connected with the motor phase line connecting end;
and the grid electrode of the second switching transistor is connected with the low-side grid electrode driving output end of the driving module through a fourth resistor, the drain electrode of the second switching transistor is grounded through the second filtering module, and the source electrode of the second switching transistor is connected with the phase line connecting end of the motor.
Optionally, the bootstrap boost module includes a second diode and a second capacitor;
the anode of the second diode is connected with a second power supply end, and the cathode of the second diode is connected with the first end of the second capacitor and the high-end floating supply end of the driving module;
the second end of the second capacitor is connected with the feedback floating supply end of the driving module;
and the feedback floating supply end of the driving module is connected with the phase line connecting end of the motor.
An electric motor comprising a motor drive circuit as claimed in any preceding claim.
Optionally, the motor is a brushless motor.
An electrical appliance comprising an electrical machine as claimed in any preceding claim.
This application adopts above technical scheme, has following beneficial effect:
in the scheme of this application, the pulse suppression module has been add in motor drive circuit, this pulse suppression module links to each other with motor phase line link, drive module is based on the voltage that the bootstrap boost module promoted, control switch module's cutting off and switching on, for the in-process that motor phase line link provided drive signal, if cut off and when switching on at switch module, because motor leakage inductance and switching device parasitic capacitance's existence, motor phase line link produces spike pulse, can restrain the increase of spike pulse with the pulse suppression module, avoid pulse amplitude too big with motor drive circuit in the overvoltage breakdown such as bootstrap boost diode of bootstrap boost module, safety and reliability have been improved, electromagnetic interference has been reduced, electromagnetic compatibility has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a motor driving circuit according to another embodiment of the present application.
Fig. 3 is a waveform diagram of a spike pulse according to another embodiment of the present application.
Fig. 4 is a waveform diagram of a spike pulse according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
Referring to fig. 1, fig. 1 is a schematic structural diagram of a motor driving circuit according to an embodiment of the present application.
As shown in fig. 1, the present embodiment provides a motor drive circuit including: the pulse suppression circuit comprises a driving module 1, a pulse suppression module 2, a bootstrap boosting module 3 and a switch module 4, wherein the bootstrap boosting module 3 and the switch module 4 are connected with the driving module 1;
the driving module 1, the switch module 4 and the pulse suppression module 2 are respectively connected with a phase line connecting end P of the motor;
the bootstrap boosting module 3 is used for boosting the voltage for the driving module 1;
the driving module 1 is used for controlling the cut-off and the conduction of the switch module 4 based on the boosted voltage so as to provide a driving signal for the phase line connecting end P of the motor;
and the pulse suppression module 2 is used for suppressing spike pulse generated by the phase line connecting end P of the motor when the switch module 4 is switched on and switched off.
Wherein, the motor phase line link can be the U phase line link, the V phase line link or the W phase line link of motor.
In practical implementation, three phase line connection ends of the motor can be connected with the motor driving circuit, and driving signals are provided for the motor through the motor driving circuit.
The motor drive circuit can be applied to a brushless motor and the like.
The bootstrap boost module, that is, the bootstrap boost circuit, utilizes electronic components such as a bootstrap boost diode and a bootstrap boost capacitor to superpose the discharge voltage of the capacitor and the power supply voltage, thereby achieving the purpose of voltage boost.
In the scheme of this application, pulse suppression module 2 has been add in motor drive circuit, this pulse suppression module 2 links to each other with motor phase line link, drive module 1 is based on the voltage that bootstrap boost module 3 promoted, control switch module 4 cut off and switch on, for motor phase line link provides drive signal's in-process, if cut off at switch module 4 with when switching on, because motor leakage inductance and switching device parasitic capacitance's existence, motor phase line link produces spike pulse, can restrain the increase of spike pulse with pulse suppression module 2, avoid pulse amplitude too big with overvoltage breakdown such as bootstrap boost diode in the bootstrap boost circuit, safety and reliability have been improved, electromagnetic interference has been reduced, electromagnetic compatibility has been improved.
A motor driving circuit provided in an embodiment of the present application is described in more detail below based on a specific circuit configuration.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a motor driving circuit according to another embodiment of the present application.
In practical implementation, the pulse suppression module 2 has various specific structures. In some embodiments, as shown in fig. 2, the pulse suppression module 2 may include: an integrating circuit 21; the integrating circuit 21 is connected to the motor phase line connection end P, and is configured to integrate the spike pulse generated by the motor phase line connection end P when the switch module 4 is turned on and turned off, so as to buffer the spike pulse.
An integration circuit is a circuit that can make an output signal proportional to a time-integrated value of an input signal. An integrating circuit is shown in fig. 2, comprising a first resistor R1 and a first capacitor C1; the first end of the first resistor R1 is connected with the motor phase line connection end, and the second end is connected with the first end of the first capacitor C1; a second terminal of the first capacitor C1 is connected to a first power supply terminal V1.
Fig. 2 provides a simplest integration circuit, which is an RC circuit composed of a resistor R and a capacitor C, when the time constant RC is large enough, the voltage of the capacitor C can only rise slowly, therefore, the RC circuit has the function of smoothing circuit signals, and the charging and discharging curve of the RC circuit is an exponential curve, so that the integration circuit can be charged by the above-mentioned spike pulse, and the spike pulse can be buffered, thereby effectively suppressing the spike pulse.
The first capacitor C1 may be, but is not limited to, an electrolytic capacitor, in which case, the positive electrode of the electrolytic capacitor is the first terminal and the negative electrode is the second terminal. Compared with other capacitors, the electrolytic capacitor is easier to obtain materials, and the scheme is simpler to realize. In implementation, electrolytic capacitors available on the market can be applied to the scheme, for example, the electrolytic capacitor with the model number of CD29 can be adopted.
As shown in fig. 2, optionally, the pulse suppression module 2 may further include: the discharge circuit 22 and the first diode D1; the first diode D1 is a zener diode; the cathode of the first diode D1 is connected with the first end of the first capacitor C1, and the anode is connected with the second end of the first capacitor C1; the first end of the discharge circuit 22 is connected to the first end of the first capacitor C1, and the second end is connected to the second end of the first capacitor C1; the first diode D1 is configured to be broken down in the reverse direction when the spike pulse reaches a predetermined magnitude, so as to increase the voltage difference across the discharge circuit 22, and thus the integrating circuit 21 is discharged through the discharge circuit 22.
In the embodiment, the Zener voltage stabilizing diode is adopted, the Zener voltage stabilizing diode is a diode which has the voltage stabilizing function and is manufactured by utilizing the phenomenon that the pn junction is in a reverse breakdown state, the current can be changed in a large range, and the voltage is basically unchanged, and the Zener voltage stabilizing diode can also be recovered after reverse breakdown. In practical application, when the peak pulse reaches a certain large amplitude, the voltage of the cathode of the zener diode is greater than the voltage of the anode, the zener diode is in a reverse breakdown state, and a voltage difference greater than the previous voltage difference exists between two ends of the discharge circuit and is stabilized at a certain value, at this time, the energy in the integrating circuit can be released through the discharge circuit, so that the voltage of the peak pulse is effectively suppressed.
In implementation, any commercially available zener diode can be applied to this scheme, for example, a zener diode with a model number of 1N4728 can be used.
As shown in fig. 2, the discharge circuit 22 may specifically include a second resistor R2; the first end of the second resistor R2 is connected to the first end of the first capacitor C1, and the second end is connected to the second end of the first capacitor C1. The resistor is an energy consumption device which is very simple and easy to obtain and has a good effect, and the discharge circuit is realized through the resistor, so that the structure design is simple and easy to realize.
As shown in fig. 2, the first power supply terminal V1 may be grounded through the first filtering module 5 to improve voltage stability. In particular, the first filtering module 5 may comprise a third capacitor C3. The third capacitor C3 can be, but is not limited to, an electrolytic capacitor, in which the positive electrode of the electrolytic capacitor is connected to the first power source terminal V1, and the negative electrode is grounded.
The switch module 4 has various specific structures. In some embodiments, as shown in fig. 2, the switch module 4 includes a first switch transistor M1, a second switch transistor M2, a third resistor R3, and a fourth resistor R4; the grid electrode of the first switching transistor M1 is connected with the high-side grid electrode driving output end of the driving module 1 through a third resistor R3, the drain electrode is connected with a first power supply end V1, and the source electrode is connected with a motor phase line connecting end P; the gate of the second switching transistor M2 is connected to the low-side gate driving output terminal of the driving module 1 through the fourth resistor R4, the source is grounded through the second filtering module 6, and the drain is connected to the motor phase line connection terminal P.
The driving module 1 includes a driving chip U, specifically, the driving chip may be a driving chip of an IR21O1S model, as shown in fig. 2, the driving chip U has a power input terminal VCC, a high-side floating supply terminal VB, a feedback floating supply terminal VS, a high-side gate driving output terminal HO, and a low-side gate driving output terminal LO. The power input terminal VCC of the driver chip is connected to the second power terminal V2. The second power supply end is set for matching with the requirement of the driving chip and can be different from the voltage value of the first power supply end.
In this embodiment, the driving module 1 controls the on/off of the first switching transistor M1 by controlling the output voltage of the high-side gate driving output terminal HO, and controls the on/off of the second switching transistor M2 by controlling the output voltage of the low-side gate driving output terminal LO, so as to provide a driving signal for the phase line connection terminal of the motor, and the specific control manner for the first switching transistor M1 and the second switching transistor M2 is the prior art, which is not an improvement point of the present application, and can refer to the prior art for implementation, and detailed description is omitted here.
The switching transistor may be of various types, and may include, but is not limited to, a MOS transistor.
As shown in fig. 2, the second filtering module 6 may include a fourth capacitor C4 and a fifth resistor R5. A first end of the fourth capacitor C4 is connected to the source of the second switching transistor M2, and a second end is grounded; the fifth resistor R5 has a first terminal connected to the source of the second switch transistor M2 and a second terminal connected to ground. Besides the structure of the second filtering module, other structures can be adopted, and are not listed here.
In specific implementation, the bootstrap boost module 3 has various specific structures. In some embodiments, as shown in fig. 2, the bootstrap boost module 3 includes a second diode D2 and a second capacitor C2; the anode of the second diode D2 is connected to the second power supply terminal V2, and the cathode is connected to the first terminal of the second capacitor C2 and the high-side floating supply terminal VB of the driving module 1; the second end of the second capacitor C2 is connected to the feedback floating supply VS of the driving module 1, and the feedback floating supply VS of the driving module is connected to the motor phase connection end P. The second diode D2 is the bootstrap boost diode, and the second capacitor C2 is the bootstrap boost capacitor.
Generally, the voltage directly output by the driving module 1 is small and is not enough to drive the first switching transistor M1 and the second switching transistor M2, so that the bootstrap boost module 3 needs to be provided, the second power supply terminal V2, the high-side floating supply terminal VB, and the feedback floating supply terminal VS provide a bootstrap boost power supply for the bootstrap boost module 3, and under the action of the bootstrap boost module 3, the voltages output by the high-side gate driving output terminal HO and the low-side gate driving output terminal LO of the driving chip are boosted, so as to output a voltage enough to drive the first switching transistor M1 and the second switching transistor M2. In addition, the motor runs by a rotating magnetic field, alternating voltage is generated, and inversion is carried out by M1 and M2 to form current exchange. Therefore, M1 and M2 need to be turned on, which ensures that Vgs (i.e. the voltage of the gate to the source) is kept at a certain value (e.g. about 10V) to turn on, M2 is grounded at the source and is easy to keep, and M1 keeps Vgs constant by the feedback floating supply VS. This is well known in the art and will not be described in detail herein.
After the spike pulse of the motor phase line connecting end P is restrained by the pulse restraining module 2, the high voltage of the motor phase line connecting end P can be prevented, so that the reverse breakdown of the second diode D2 in the bootstrap booster circuit 3 is realized, and the reliability of the circuit is further improved.
Compared with the circuit structure shown in fig. 2 provided by the present application, in the conventional motor driving circuit, the pulse suppression module 2 is not provided, and referring to the monitored waveform diagram of the motor phase line connection end shown in fig. 3, it can be seen that when the motor phase line connection end generates a spike pulse, the generated spike pulse is very sharp and has a very high amplitude. Based on the circuit structure shown in fig. 2 provided by the present application, when the motor phase line connection end generates a spike pulse, because the integration circuit composed of the first resistor R1 and the first capacitor C1 can suppress the increase of the spike pulse, when the spike pulse reaches a certain amplitude, the zener diode is reverse-broken down again, so that the voltage difference between the two ends of the second resistor R2 is increased, the first capacitor C1 discharges to the second resistor R2, and the second resistor R2 generates heat to consume energy, thereby forming currents from the motor phase line connection end to the first resistor R1, the first diode D1, the first capacitor C1, the second resistor R2, and the third capacitor C3 to the ground, referring to the waveform diagram of the monitored motor phase line connection end shown in fig. 4, it can be seen that the amplitude of the spike pulse has been effectively suppressed compared with fig. 3, and the reliability and the electromagnetic compatibility of the circuit are greatly improved.
In fig. 3 and 4, the abscissa represents time and the ordinate represents amplitude.
Based on the same concept, another embodiment of the present application also provides a motor including the motor driving circuit according to any of the above embodiments.
Optionally, the motor is a brushless motor.
For specific implementation of the motor provided in the embodiment of the present application, reference may be made to the implementation of the motor driving circuit in any of the above examples, and details are not described here.
Based on the same concept, another embodiment of the present application further provides an electrical apparatus including the motor according to any of the above embodiments. Optionally, the electrical device is an air conditioner or the like.
The specific implementation of the electrical equipment provided in the embodiment of the present application may refer to the implementation of the motor in any of the above examples, and details are not described here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A motor drive circuit, comprising: the pulse suppression circuit comprises a driving module, a pulse suppression module, a bootstrap boosting module and a switch module, wherein the bootstrap boosting module is connected with the driving module; wherein the content of the first and second substances,
the driving module, the switch module and the pulse suppression module are respectively connected with a motor phase line connecting end;
the bootstrap boosting module is used for boosting voltage for the driving module;
the driving module is used for controlling the cut-off and the conduction of the switch module based on the boosted voltage so as to provide a driving signal for the phase line connecting end of the motor;
and the pulse suppression module is used for suppressing spike pulse generated by the phase line connecting end of the motor when the switch module is switched on and switched off.
2. The motor drive circuit of claim 1, wherein the pulse suppression module comprises: an integrating circuit;
the integrating circuit is connected with the motor phase line connecting end and used for integrating the spike pulse generated by the motor phase line connecting end when the switch module is switched on and switched off so as to buffer the spike pulse.
3. The motor drive circuit of claim 2, wherein the integration circuit comprises a first resistor and a first capacitor;
the first end of the first resistor is connected with the motor phase line connecting end, and the second end of the first resistor is connected with the first end of the first capacitor;
and the second end of the first capacitor is connected with a first power supply end.
4. The motor drive circuit of claim 3, wherein the pulse suppression module further comprises: a discharge circuit and a first diode; the first diode is a Zener voltage stabilizing diode;
the cathode of the first diode is connected with the first end of the first capacitor, and the anode of the first diode is connected with the second end of the first capacitor;
the first end of the discharge circuit is connected with the first end of the first capacitor, and the second end of the discharge circuit is connected with the second end of the first capacitor;
the first diode is used for being broken down reversely when the spike pulse reaches a preset amplitude value so as to improve the voltage difference between two ends of the discharge circuit and enable the integration circuit to discharge through the discharge circuit.
5. The motor drive circuit of claim 4, wherein the discharge circuit comprises a second resistor;
and the first end of the second resistor is connected with the first end of the first capacitor, and the second end of the second resistor is connected with the second end of the first capacitor.
6. The motor drive circuit according to claim 3, wherein the switching module includes a first switching transistor, a second switching transistor, a third resistor, and a fourth resistor;
the grid electrode of the first switching transistor is connected with the high-side grid electrode driving output end of the driving module through a third resistor, the source electrode of the first switching transistor is connected with the first power supply end, and the drain electrode of the first switching transistor is connected with the motor phase line connecting end;
and the grid electrode of the second switching transistor is connected with the low-side grid electrode driving output end of the driving module through a fourth resistor, the drain electrode of the second switching transistor is grounded through the second filtering module, and the source electrode of the second switching transistor is connected with the phase line connecting end of the motor.
7. The motor drive circuit of claim 1, wherein the bootstrap boost module comprises a second diode and a second capacitor;
the anode of the second diode is connected with a second power supply end, and the cathode of the second diode is connected with the first end of the second capacitor and the high-end floating supply end of the driving module;
the second end of the second capacitor is connected with the feedback floating supply end of the driving module;
and the feedback floating supply end of the driving module is connected with the phase line connecting end of the motor.
8. An electric motor comprising a motor drive circuit according to any one of claims 1 to 7.
9. The motor of claim 8, wherein the motor is a brushless motor.
10. An electrical apparatus, characterized in that it comprises an electric machine according to claim 8 or 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921414822.9U CN210405133U (en) | 2019-08-28 | 2019-08-28 | Motor drive circuit, motor and electrical equipment |
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| CN201921414822.9U CN210405133U (en) | 2019-08-28 | 2019-08-28 | Motor drive circuit, motor and electrical equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572086A (en) * | 2019-08-28 | 2019-12-13 | 珠海凯邦电机制造有限公司 | Motor drive circuit, motor and electrical equipment |
| WO2021217454A1 (en) * | 2020-04-28 | 2021-11-04 | 武文静 | Voltage bootstrap chip, low-light collection circuit and device, and control methods therefor |
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2019
- 2019-08-28 CN CN201921414822.9U patent/CN210405133U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572086A (en) * | 2019-08-28 | 2019-12-13 | 珠海凯邦电机制造有限公司 | Motor drive circuit, motor and electrical equipment |
| WO2021217454A1 (en) * | 2020-04-28 | 2021-11-04 | 武文静 | Voltage bootstrap chip, low-light collection circuit and device, and control methods therefor |
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