CN213342019U - Drive device and switching power supply - Google Patents
Drive device and switching power supply Download PDFInfo
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- CN213342019U CN213342019U CN202021601555.9U CN202021601555U CN213342019U CN 213342019 U CN213342019 U CN 213342019U CN 202021601555 U CN202021601555 U CN 202021601555U CN 213342019 U CN213342019 U CN 213342019U
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Abstract
The utility model discloses a drive arrangement and switching power supply relates to the power electronics field, and wherein, drive arrangement includes: the driving module is used for providing a driving signal; the rectifying module is connected with the driving module and used for providing positive and negative voltages; and the voltage stabilizing module is respectively connected with the driving module and the rectifying module and is used for providing stable positive and negative voltages. The utility model discloses can realize drive arrangement's modularized design through drive module, rectifier module, voltage stabilizing module, the design is simple to can realize obtaining the effect of stabilizing positive negative voltage through the combination of three module, improve drive arrangement's performance.
Description
Technical Field
The utility model belongs to the technical field of power electronics and specifically relates to a drive arrangement and switching power supply are related to.
Background
With the development of technology, switching power supplies, which are high-frequency power conversion devices and are used for supplying power, have a function of converting a voltage of one level into a voltage or a current required by a user terminal through different types of architectures (topologies), have been widely used in high cost performance. The driving device in the switching power supply can be arranged in different forms of topologies, which plays a crucial role in the design of the switching power supply.
At present, the driving device has the problems of complex design and lower performance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a driving device can realize the simple, high performance beneficial effect of driving device structural design.
The utility model discloses still provide a switching power supply who has above-mentioned drive arrangement.
According to the utility model discloses a drive arrangement of first aspect embodiment includes: the driving module is used for providing a driving signal; the rectifying module is connected with the driving module and used for providing positive and negative voltages; and the voltage stabilizing module is respectively connected with the driving module and the rectifying module and is used for providing stable positive and negative voltages.
According to the utility model discloses drive arrangement has following beneficial effect at least: can realize drive arrangement's modularized design through drive module, rectifier module, voltage stabilizing module, the design is simple to can realize obtaining the effect of stabilizing positive negative output voltage through the combination of three module, improve drive arrangement's performance.
According to some embodiments of the invention, the drive module comprises: the first driving module is respectively connected with the rectifying module and the voltage stabilizing module and used for providing a first driving signal; the second driving module is connected with the first driving module, and is also respectively connected with the rectifying module and the voltage stabilizing module and used for providing a second driving signal; the first drive signal and the second drive signal are complementary to each other by 180 degrees in a switching period.
According to some embodiments of the invention, the duty cycle of the first drive signal and the second drive signal is equal to or less than 50%.
According to some embodiments of the utility model, first drive module includes first resistance, first electric capacity, first switch tube and transformer primary coil, first resistance and the parallelly connected first parallel circuit that forms of first electric capacity, first parallel circuit first end respectively with the first end and the power of first switch tube are connected, the second end of first parallel circuit is connected transformer primary coil's second terminal, transformer primary coil's first terminal is connected the second end of first switch tube, the PWM signal of input is connected to the third end of first switch tube.
According to the utility model discloses a some embodiments, the second drive module includes second resistance, second electric capacity, second switch tube, second resistance and the parallelly connected second parallel circuit that forms of second electric capacity, the first end of second parallel circuit is connected first drive module, the second parallel circuit the second end with second switch tube second end is connected and ground connection, the first end of second switch tube is connected first drive module, the second PWM signal of input is connected to the third end of second switch tube.
According to some embodiments of the utility model, the rectifier module includes first transformer secondary coil, third electric capacity, fourth electric capacity, first diode, second diode, the second diode positive pole respectively with transformer secondary coil fifth terminal with the first end of fourth electric capacity is connected, transformer secondary coil sixth terminal is connected the first end of third electric capacity, third electric capacity second end respectively with the second diode negative pole with the anodal connection of first diode, first diode negative pole is connected the fourth electric capacity second end.
According to some embodiments of the invention, the voltage stabilizing module comprises: the third terminal of the secondary coil of the second transformer is respectively connected with the first end of the fifth capacitor, the first end of the voltage-stabilizing tube and the first end of the sixth capacitor, the second end of the voltage-stabilizing tube is respectively connected with the first end of the third resistor and the first end of the third switch tube, the fourth terminal of the secondary coil of the second transformer is connected with the anode of the third diode, the cathode of the third diode is respectively connected with the second end of the fifth capacitor, the second end of the third resistor, the cathode of the fourth diode and the second end of the third switch tube, and the third end of the third switch tube is respectively connected with the anode of the fourth diode and the second end of the sixth capacitor.
According to some embodiments of the invention, the third switching tube is an NPN transistor.
A switching power supply according to an embodiment of the second aspect of the present invention includes the driving device according to the first aspect.
According to the utility model discloses switching power supply has following beneficial effect at least: the modular design of the driving device in the switching power supply can be realized, the simple design is realized, the effect of outputting stable positive and negative voltages is realized, and the performance of the switching power supply is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic block diagram of a driving device according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a driving device according to another embodiment of the present invention;
fig. 3 is a circuit diagram of a driving device according to another embodiment of the present invention;
fig. 4 is a timing diagram of a driving device according to another embodiment of the present invention.
Reference numerals:
the driving module 100, the rectifying module 200, the voltage stabilizing module 300, the first driving module 101, and the second driving module 102.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, a schematic block diagram of a driving apparatus according to an embodiment of the present invention is shown;
in some embodiments, the driving device comprises: the driving circuit comprises a driving module 100, a rectifying module 200 and a voltage stabilizing module 300, wherein the driving module 100 is used for providing a driving signal; the rectifying module 200 is connected with the driving module 100 and is used for providing positive and negative voltages; the voltage stabilizing module 300 is respectively connected to the driving module 100 and the rectifying module 200 for providing stable positive and negative voltages.
The embodiment can realize the modular design of the driving device through the driving module, the rectifying module and the voltage stabilizing module, has simple design, can realize the effect of stabilizing positive and negative voltages through the combination of the three modules, and improves the performance of the driving device.
In some embodiments, the driving module 100 may include a plurality.
Specifically, the number of the driving modules 100 directly determines how much energy the driving modules transmit, for example, 15V voltage is connected to the front end of the driving module 100, if there are 5 driving modules, when one driving module is turned on, the energy transmitted to the rear end of the driving module is 15V/5 ═ 3V, the driving chip model of the driving module used in this embodiment is SG3525, which has the advantages of adjustable power, adjustable dead time, and the like, and can effectively adjust the power of the driving signal and the quality of the driving signal.
The present embodiment can realize the capability of the driving module to control energy transmission, and it can be understood that the energy referred to in the present embodiment refers to the magnitude of the voltage.
Referring to fig. 2, a schematic block diagram of a driving apparatus according to another embodiment of the present invention is shown;
the driving module 100 includes a first driving module 101 and a second driving module 102, wherein the first driving module 101 is connected to the rectifying module 200 and the voltage stabilizing module 300, respectively, for providing a first driving signal; the second driving module 102 is connected to the first driving module 101, and the second driving module 102 is further connected to the rectifying module 200 and the voltage stabilizing module 300, respectively, and configured to provide a second driving signal; the first drive signal and the second drive signal are complementary to 180 degrees during the switching period.
Referring to fig. 3, assuming that the signal of the first driving module is PWM1, the signal of the second driving module is PWM2, and the PWM1 and the PWM2 are 180 ° complementary driving signals in the switching period, and output energy to the secondary winding of the transformer T1 after half-bridge conversion. The first resistor R1 and the second resistor R2 are used for voltage equalization of the first capacitor C1 and the second capacitor C2, so as to avoid magnetic bias saturation of the transformer T1.
Referring to fig. 3, a circuit diagram of a driving apparatus according to another embodiment of the present invention is shown.
In some embodiments, the duty cycle of the first drive signal and the second drive signal is equal to or less than 50%.
Specifically, assuming that the signal of the first driving module is PWM1 and the signal of the second driving module is PWM2, the duty ratio of the PWM1 and the PWM2 sent by the primary side of the transformer T1 is not more than 50%, the design aims to reserve a certain dead time, and avoid the direct connection of the upper and lower pipes of the first switching tube Q1 and the second switching tube Q2, which causes circuit failure, so that the reliability of the driving device is improved in this embodiment.
Referring to fig. 3, a circuit diagram of a driving apparatus according to another embodiment of the present invention is shown.
In some embodiments, the first driving module 101 includes a first resistor R1, a first capacitor C1, a first switch Q1, and a primary winding of a transformer T1, wherein the first resistor R1 and the first capacitor C1 are connected in parallel to form a first parallel circuit, a first end of the first parallel circuit is connected to the first end of the first switch Q1 and the power supply, a second end of the first parallel circuit is connected to a second terminal of the primary winding of the transformer, a first terminal of the primary winding of the transformer is connected to a second end of the first switch Q1, and a third end of the first switch Q1 is connected to the input first PWM signal PWM 1.
In some embodiments, the second driving module includes a second resistor R2, a second capacitor C2, and a second switch Q2, wherein the second resistor R2 and the second capacitor C2 are connected in parallel to form a second parallel circuit, a first end of the second parallel circuit is connected to the first driving module 101, a second end of the second parallel circuit is connected to the second end of the second switch Q2 and grounded, a first end of the second switch Q2 is connected to the first driving module 101, and a third end of the second switch Q2 is connected to the input second PWM signal PWM 2.
Specifically, the PWM signal belongs to a digital signal, and digital-to-analog conversion is not required, so that the influence of signal noise can be minimized, thereby improving the performance of the driving device.
Specifically, the primary coil of the transformer T1 is the coil on the side of the transformer terminals 1 and 2, the secondary coil of the transformer T1 is the coil on the side of the transformer terminals 3, 4, 5, and 6, the terminal 1 on the primary side of the transformer T1 and the terminals 3 and 6 on the secondary side of the transformer T1 are terminals of the same name, and the turn ratio of the primary side to the secondary side is 1:1: 1.
In this embodiment, two voltages having opposite polarities, i.e., positive and negative voltages, are generated at the rear end of the driving device by electromagnetic conversion between the primary winding of the transformer T1 and the secondary winding of the transformer T1.
This embodiment can realize, can realize the formation of drive arrangement positive and negative voltage through the simple design of transformer to realized the simple effect of drive arrangement design, simultaneously because the components and parts that use are less, also can play the effect of saving cost.
In some embodiments, the first switch transistor Q1 and the second switch transistor Q2 may be insulated gate transistors, or MOS transistors may be used as the switch transistors.
Specifically, the MOS transistor has the advantages of small internal resistance, high switching speed, low on resistance, high voltage resistance, high thermal stability, and the like, and can greatly reduce the size of elements such as an inductor, a capacitor, a radiator, and the like in the driving device, greatly reduce the size, weight, and cost of the power electronic device, and greatly improve the performance of the system. The insulated gate transistor has the advantages of small driving power, high switching speed and capability of bearing high voltage and large current, is suitable for a specific circuit in the embodiment, and improves the reliability of the driving device.
In some embodiments, the rectifier module 200 includes a first transformer secondary winding, a third capacitor C3, a fourth capacitor C4, a first diode D1, and a second diode D2, wherein an anode of the second diode D2 is connected to a fifth terminal of the transformer secondary winding and a first end of the fourth capacitor C4, a sixth terminal of the transformer secondary winding is connected to a first end of the third capacitor C3, a second terminal of the third capacitor C3 is connected to a cathode of the second diode D2 and an anode of the first diode D1, and a cathode of the first diode D1 is connected to a second terminal of the fourth capacitor C4.
Specifically, terminals DRV _ OV and + VCC are respectively led out from a first terminal and a second terminal of the fourth capacitor C4.
The present embodiment enables the driving device to output a positive voltage, i.e., + VCC, where the terminal DRV _ OV is the reference voltage terminal, + VCC is the output positive voltage +15V, DRV _0V is the output reference ground, and-VEE is the output negative voltage-2.5V.
The design of rectifier module 200 can be realized to this embodiment to can realize drive arrangement output positive voltage through the less components and parts of quantity, circuit design is simple, and the cost is lower, more is applicable to batch application.
In some embodiments, the voltage stabilization module 300 includes: a second transformer secondary side coil, a third diode D3, a fourth diode D4, a third resistor R3, a third switch tube Q3, a voltage regulator tube M1, a fifth capacitor C5 and a sixth capacitor C6, wherein the third terminal of the second transformer secondary side coil is respectively connected with the first end of the fifth capacitor C5, the first end of the voltage regulator tube M1 and the first end of the sixth capacitor C6, the second end of the voltage regulator tube M1 is respectively connected with the first end of the third resistor R3 and the first end of the third switch tube Q3, the fourth terminal of the second transformer secondary side coil is connected with the positive electrode of the third diode D3, the negative electrode of the third diode D3 is respectively connected with the second end of the fifth capacitor C5, the second end of the third resistor R3, the negative electrode of the fourth diode D4 and the second end of the third switch tube Q3, and the third switch tube Q3 is respectively connected with the positive electrode of the fourth diode D4 and the second end of the sixth capacitor C6.
Specifically, the first end of the sixth capacitor and the second end of the sixth capacitor respectively lead out terminals-VEE and DRV _ OV, wherein DRV _0V is the output reference ground, and-VEE is the output negative voltage-2.5V.
The embodiment can realize the output of stable negative voltage, and simultaneously can ensure the stability of the positive voltage output in the embodiment because the voltage regulator tube M1 is added in the circuit.
The design of voltage stabilizing module 300 can be realized to this embodiment to can realize through the less components and parts of quantity that drive arrangement exports stable positive and negative voltage, circuit design is simple, and the cost is lower, more is applicable to batch application.
In some embodiments, the third switching tube is an NPN transistor.
The NPN transistor applied to the voltage stabilizing module 300 includes: a second transformer secondary side coil, a third diode D3, a fourth diode D4, a third resistor R3, an NPN type triode Q3, a voltage regulator tube M1, a fifth capacitor C5 and a sixth capacitor C6, wherein a third terminal of the second transformer secondary side coil is respectively connected with a first end of the fifth capacitor C5, a first end of the voltage regulator tube M1 and a first end of the sixth capacitor C6, a second end of the voltage regulator tube M1 is respectively connected with a first end of the third resistor R3 and a base of the NPN type triode Q3, a fourth terminal of the second transformer secondary side coil is connected with an anode of the third diode D3, a cathode of the third diode D3 is respectively connected with a second end of the fifth capacitor C5, a second end of the third resistor R3, a cathode of the fourth diode D4 and a collector of the NPN type triode Q3, and an emitter of the NPN type triode Q3 is respectively connected with an anode of the fourth diode D4 and a second end of the sixth capacitor C6.
Specifically, the regulator M1 used in this embodiment is a 3.3V regulator, and it can be understood that the regulator is a crystal diode and has the characteristic of stabilizing voltage.
It can be understood that the NPN type triode has the characteristics of long service life, safety, reliability, no mechanical wear, high switching speed, small size and the like. And the on-off of large current can be controlled by using small current.
Referring to fig. 4, a timing diagram of a driving device according to another embodiment of the present invention is shown.
In order to better understand the present invention, the functions that can be realized by the driving device in the above embodiments are further explained in the form of a time sequence diagram.
In some embodiments, with reference to fig. 3 and 4, T represents a timing cycle, T/2 represents a half timing cycle, PWM1 represents a first driving signal, PWM2 represents a second driving signal, from 0 to T1, the first switching tube Q1 is turned off, and when the second switching tube Q2 is turned on, the voltage applied across the primary winding terminals 1 and 2 of the transformer T1 is half of the input voltage, i.e., 7.5V, and energy is transferred from the primary winding of the transformer T1 to the secondary winding of the transformer T1. When the current of the secondary winding of the transformer T1 is output from the terminal 5 of the secondary winding of the transformer T1, flows through the second diode D2 and the third capacitor C3, and charges the third capacitor C3 to a voltage equal to about 7.5V, which is the input voltage of the primary winding of the transformer T1 of 1/2, the first end, i.e., the left side, of the third capacitor C3 is negative, and the second end, i.e., the right side, of the third capacitor C3 is positive. Similarly, the current of the secondary winding of the transformer T1 also flows from the terminal 4 of the secondary winding of the transformer T1 through the third diode D3 and the fifth capacitor C5, and charges the fifth capacitor C5 to around 7.5V, which is the input voltage of the primary winding of the transformer T1 of 1/2.
Specifically, the voltage (7.5V) of the fifth capacitor C5 clamps the base voltage Vb of the third switching tube Q3 at 3.3V through the third resistor R3 and the voltage regulator tube M1, when the base voltage of the third switching tube Q3 is greater than 0.7V of the emitter voltage Vbe, the third switching tube Q3 is turned on, otherwise, the third switching tube Q3 is turned off, and the third switching tube Q3 is dynamically adjusted all the time.
Assuming that the voltage of the sixth capacitor C6 is V1, and V1 is Vb-Vbe is 3.3V-0.7V and 2.6V, the voltage stabilizing module 300 stabilizes the voltage of the sixth capacitor C6 at about 2.6V, and VEE is-V1 is-2.6V. Thereby achieving the ability to provide a stable negative voltage to the output. Meanwhile, if the voltage on the sixth capacitor C6 is affected by the gate interference of the first switch tube Q1 and/or the second switch tube Q2, VEE is raised to be greater than 7.5V, energy can be fed back to the fifth capacitor C5 through the fourth diode D4, the voltage of the sixth capacitor C6 is clamped at 7.5V by the fourth diode D4 when the voltage is interfered, so that the negative voltage of the gate of the first switch tube Q1 and/or the second switch tube Q2 cannot exceed the safe voltage, and the protection effect is achieved.
Specifically, the time T1-T2 and the time T3-T4 are dead time, the first switching tube Q1 is turned off, the second switching tube Q2 is turned off, the secondary winding of the transformer T1 is in a short-circuit state due to the fact that the first diode D1 and the second diode D2 freewheel simultaneously, and the primary winding of the transformer T1 is in a short-circuit state.
Specifically, at time T2 to T3, when the first switching tube Q1 is turned on and the second switching tube Q2 is turned off, the current of the secondary winding of the transformer T1 is output from the secondary winding terminal 6 of the transformer T1, flows through the third capacitor C3, the first diode D1 and the fourth capacitor C4, and finally returns to the secondary winding terminal 5 of the transformer T1, at this time, the voltage of the secondary winding of the transformer T1 is V2(7.5V), the secondary winding terminal 6 of the transformer T1 is positive, the secondary winding terminal 5 of the transformer T1 is negative, the voltage V3 of the third capacitor C3 is positive at a first end (-7.5V), that is, the left side, the second end, that is, the right side, the second end of the third capacitor C3 is negative, and the voltage + VCC of the fourth capacitor C4 is equal to V2-V3, that is 15V.
The circuit of the utility model can provide stable negative voltage-VEE about-2.6V and positive voltage + VCC about + 15V.
In some embodiments, a switching power supply is provided, including the driving device in the above embodiments, and by a modular design of the driving device in the switching power supply, the switching power supply can achieve the effects of simple design and stable output of positive and negative voltages, and improve the performance of the switching power supply.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 present invention. 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.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A drive device, comprising:
the driving module is used for providing a driving signal;
the rectifying module is connected with the driving module and used for providing positive and negative voltages;
and the voltage stabilizing module is respectively connected with the driving module and the rectifying module and is used for providing stable positive and negative voltages.
2. The drive device of claim 1, wherein the drive module comprises:
the first driving module is respectively connected with the rectifying module and the voltage stabilizing module and used for providing a first driving signal;
the second driving module is connected with the first driving module, and is also respectively connected with the rectifying module and the voltage stabilizing module and used for providing a second driving signal;
the first drive signal and the second drive signal are complementary to each other by 180 degrees in a switching period.
3. The driving apparatus as claimed in claim 2, wherein the duty ratio of each of the first and second driving signals is less than or equal to 50%.
4. The driving apparatus according to claim 2, wherein the first driving module includes a first resistor, a first capacitor, a first switch tube and a primary transformer coil, the first resistor and the first capacitor are connected in parallel to form a first parallel circuit, a first end of the first parallel circuit is connected to the first end of the first switch tube and the power supply, a second end of the first parallel circuit is connected to the second terminal of the primary transformer coil, a first terminal of the primary transformer coil is connected to the second end of the first switch tube, and a third end of the first switch tube is connected to the input first PWM signal.
5. The driving apparatus according to claim 4, wherein the second driving module includes a second resistor, a second capacitor, and a second switch tube, the second resistor and the second capacitor are connected in parallel to form a second parallel circuit, a first end of the second parallel circuit is connected to the first driving module, a second end of the second parallel circuit is connected to the second end of the second switch tube and grounded, the first end of the second switch tube is connected to the first driving module, and a third end of the second switch tube is connected to the input second PWM signal.
6. The driving apparatus as claimed in claim 1, wherein the rectifying module comprises a first transformer secondary winding, a third capacitor, a fourth capacitor, a first diode, and a second diode, the anode of the second diode is connected to the fifth terminal of the transformer secondary winding and the first end of the fourth capacitor, respectively, the sixth terminal of the transformer secondary winding is connected to the first end of the third capacitor, the second end of the third capacitor is connected to the cathode of the second diode and the anode of the first diode, respectively, and the cathode of the first diode is connected to the second end of the fourth capacitor.
7. The driving apparatus according to claim 1, wherein the voltage stabilization module includes: the third terminal of the secondary coil of the second transformer is respectively connected with the first end of the fifth capacitor, the first end of the voltage-stabilizing tube and the first end of the sixth capacitor, the second end of the voltage-stabilizing tube is respectively connected with the first end of the third resistor and the first end of the third switch tube, the fourth terminal of the secondary coil of the second transformer is connected with the anode of the third diode, the cathode of the third diode is respectively connected with the second end of the fifth capacitor, the second end of the third resistor, the cathode of the fourth diode and the second end of the third switch tube, and the third end of the third switch tube is respectively connected with the anode of the fourth diode and the second end of the sixth capacitor.
8. The driving apparatus as claimed in claim 7, wherein the third switching tube is an NPN transistor.
9. Switching power supply, characterized in that it comprises a drive device according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021601555.9U CN213342019U (en) | 2020-08-04 | 2020-08-04 | Drive device and switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021601555.9U CN213342019U (en) | 2020-08-04 | 2020-08-04 | Drive device and switching power supply |
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| CN213342019U true CN213342019U (en) | 2021-06-01 |
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| CN202021601555.9U Active CN213342019U (en) | 2020-08-04 | 2020-08-04 | Drive device and switching power supply |
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