CN111245214A - Quick start circuit and switching power supply - Google Patents
Quick start circuit and switching power supply Download PDFInfo
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- CN111245214A CN111245214A CN202010227463.7A CN202010227463A CN111245214A CN 111245214 A CN111245214 A CN 111245214A CN 202010227463 A CN202010227463 A CN 202010227463A CN 111245214 A CN111245214 A CN 111245214A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Abstract
The embodiment of the invention discloses a quick starting circuit and a switching power supply, wherein the quick starting circuit comprises a preceding stage input unit, a charging starting unit, a charging adjusting unit, an auxiliary power supply and a control unit; the front-stage input unit is used for being connected with an external power supply so as to provide starting voltage for the control unit through the charging starting unit; when the control unit is started, the auxiliary power supply is switched on, the auxiliary power supply provides starting voltage for the control unit, and the control unit generates a charging signal to charge the charging adjustment unit; when the control unit detects that the output fault of the switching power supply occurs, the control unit cuts off the starting voltage provided by the auxiliary power supply, so that the charging adjusting unit adjusts the charging starting unit to be in a connected state, and provides the starting voltage for the control unit again to restart the control unit. The embodiment of the invention can realize the quick shutdown and restart of the control unit, thereby quickly restoring the normal work of the switch power supply.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a quick start circuit and a switching power supply.
Background
In the application of a switching power supply, especially in an LED driving power supply, ERP (energy related product) energy efficiency regulations require that the starting time of the switching power supply is less than 0.5 second, so that the switching power supply generally has a quick starting circuit, and meanwhile, a high-voltage starting unit is correspondingly integrated in a control unit of the switching power supply, and the high-voltage starting unit can be compatible with a low-voltage power supply pin in normal operation or can lead out a special high-voltage starting pin, so that the quick starting requirement of the ERP (energy related product) is met.
When the switching power supply breaks down, the control unit triggers a corresponding protection mechanism, a high-frequency driving signal can be sent out intermittently or the high-frequency driving signal can be sent out completely, and at the moment, for the high-voltage starting of the switching power supply, the power supply voltage of the control unit can rise and fall repeatedly like triangular waves. If the internal circuit or the external power supply circuit of the control unit is designed poorly at this moment, after a deadlock protection mechanism occurs, the power supply voltage of the control unit cannot be reduced for a long time, so that the control unit still can be in a deadlock state after the fault is eliminated, even if the switching power supply is started for the second time, normal work cannot be recovered, the only solution is to completely turn off the switching power supply, and after waiting for a long period of time, the switching power supply can be started again to run normally, so that the user experience is seriously influenced.
Disclosure of Invention
The embodiment of the invention provides a quick start circuit and a switching power supply, which are simple in structure, can quickly reduce the power supply voltage of the switching power supply, can quickly restart the power supply, and improve the use experience of a user.
In a first aspect, an embodiment of the present invention provides a fast start circuit, where the fast start circuit is applied to a switching power supply, and the fast start circuit includes a preceding stage input unit, a charging start unit, a charging adjustment unit, an auxiliary power supply, and a control unit;
the front stage input unit is used for being connected with an external power supply so as to provide starting voltage for the control unit through the charging starting unit; when the control unit receives a starting voltage, the auxiliary power supply is switched on to provide the starting voltage for the control unit through the auxiliary power supply, and the control unit generates a charging signal to charge the charging adjustment unit, so that the charging adjustment unit adjusts the charging starting unit to a short-circuit state, and the control unit also generates a corresponding driving signal to drive the external equipment to work; when the control unit detects that the output fault of the switching power supply occurs, the control unit cuts off the starting voltage provided by the auxiliary power supply to stop generating the charging signal and the driving signal, so that the charging adjusting unit adjusts the charging starting unit to be in a connected state, and provides the starting voltage for the control unit again to restart the control unit.
Further, the charging start unit comprises a resistor R1 and a capacitor C1; one end of the resistor R1 is connected with the output end of the preceding stage input unit, the other end of the resistor R1 is respectively connected with one end of the capacitor C1 and the starting signal end of the control unit, and the other end of the capacitor C1 is grounded.
Further, the charging start unit further includes a diode D1; the anode of the diode D1 is connected to the other end of the resistor R1, and the cathode of the diode D1 is connected to one end of the capacitor C1.
Further, the charging adjustment unit comprises a switching tube Q1, a capacitor C2 and a diode D2; the charging signal end of the control unit is connected with the anode of the diode D2, the cathode of the diode D2 is connected with one end of the capacitor C2, one end of the capacitor C2 is connected with the gate of the switch tube Q1, the other end of the capacitor C2 and the drain of the switch tube Q1 are both grounded, and the source of the switch tube Q1 is connected with the other end of the resistor R1.
Further, the model of the switching tube Q1 is NMOS.
Further, the charging adjustment unit further includes a resistor R2, one end of the resistor R2 is connected to the cathode of the diode D2, and the other end of the resistor R2 is connected to the gate of the switching tube Q1.
Further, the charging adjustment unit further comprises a resistor R3, and the resistor R3 is connected in parallel with the capacitor C2.
Further, the charging adjustment unit further includes a resistor R4, one end of the resistor R4 is connected to the cathode of the diode D2, and the other end of the resistor R4 is connected to one end of the resistor R2.
Further, the preceding stage input unit specifically comprises an AC input module, a lightning protection module, an EMI filter module, and an input rectification module; the input end of the AC input module is connected with the output end of the external power supply, the output end of the AC input module is connected with the input end of the lightning protection module, the output end of the lightning protection module is connected with the input end of the EMI filtering module, the output end of the EMI filtering module is connected with the input end of the input rectifying module, and the output end of the input rectifying module is connected with the input end of the charging starting unit.
In a second aspect, the present invention further provides a switching power supply, where the switching power supply includes the fast start circuit, and the fast start circuit includes a preceding stage input unit, a charging start unit, a charging adjustment unit, an auxiliary power supply, and a control unit;
the front stage input unit is used for being connected with an external power supply so as to provide starting voltage for the control unit through the charging starting unit; when the control unit receives a starting voltage, the auxiliary power supply is switched on to provide the starting voltage for the control unit through the auxiliary power supply, and the control unit generates a charging signal to charge the charging adjustment unit, so that the charging adjustment unit adjusts the charging starting unit to a short-circuit state, and the control unit also generates a corresponding driving signal to drive the external equipment to work; when the control unit detects that the output fault of the switching power supply occurs, the control unit cuts off the starting voltage provided by the auxiliary power supply to stop generating the charging signal and the driving signal, so that the charging adjusting unit adjusts the charging starting unit to be in a connected state, and provides the starting voltage for the control unit again to restart the control unit.
The embodiment of the invention has simple structure, can quickly restart the control unit when the circuit of the switching power supply is restarted for the second time after the circuit fault is eliminated, so that the circuit can be recovered to work normally, and the convenience and the use experience of a user are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a fast start circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a fast boot provided by an embodiment of the present invention;
FIG. 3 is a further circuit diagram of a fast boot provided by an embodiment of the present invention;
FIG. 4 is a further circuit diagram of a fast boot provided by an embodiment of the present invention;
FIG. 5 is a further circuit diagram of a fast boot provided by an embodiment of the present invention;
FIG. 6 is a further circuit diagram of a fast boot provided by an embodiment of the present invention;
fig. 7 is a block diagram of a preceding stage input unit according to an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, the quick start circuit provided by the embodiment of the present invention is generally used in a switching power supply, and the quick start circuit can rapidly reduce a start voltage provided by a charge start unit for a control unit by controlling the charge adjustment unit when a circuit of the switching power supply fails, so as to implement quick restart of the control unit, and particularly, when a secondary restart is required after the circuit failure of the switching power supply is eliminated, the control unit is not locked and protected due to an excessively high start voltage provided by the charge start unit, thereby improving convenience in use and user experience.
The rapid starting circuit provided by the embodiment of the invention comprises a preceding stage input unit 11, a charging starting unit 12, a charging adjusting unit 14, an auxiliary power supply 15 and a control unit 13; the preceding stage input unit 11 is used for connecting with an external power supply to provide a starting voltage for the control unit 13 through the charging starting unit 12; when the control unit 13 receives the start voltage, the auxiliary power supply 15 is turned on to provide the start voltage for the control unit 13 through the auxiliary power supply 15, and the control unit 13 generates a charging signal to charge the charging adjustment unit 14, so that the charging adjustment unit 14 adjusts the charging start unit 12 to a short-circuit state, and the control unit 13 further generates a corresponding driving signal to drive an external device to operate; when the control unit 13 detects that the output of the switching power supply fails, the control unit 13 turns off the starting voltage provided by the auxiliary power supply 15 to stop generating the charging signal and the driving signal, so that the charging adjustment unit 14 adjusts the charging starting unit 12 to the on state, and provides the starting voltage for the control unit 13 again to restart the control unit 13.
Specifically, the external power supply supplies a corresponding voltage to the charging start unit 12 through the preceding stage input unit 11, so that the charging start unit 12 can charge the control unit 13, and when the voltage supplied by the charging start unit 12 meets the start voltage of the control unit 13, the control unit 13 can start to supply power to the external device. Meanwhile, after the control unit 13 is started, the control unit 13 generates a charging signal to charge the charging adjustment unit 14, and enables the charging adjustment unit 14 to enable the charging start unit to realize a short circuit, so as to control the charging start unit 12 to cut off the charging of the control unit 13, and at the same time, the control unit 13 can allow the auxiliary power supply 15 to provide a start voltage for the auxiliary power supply; the auxiliary power supply 15 may be composed of an auxiliary winding, or may be an external independent power supply, and the specific type is not limited herein, the auxiliary power supply 15 needs to be capable of being linked with the driving signal of the control unit 13, and the control unit 13 is capable of controlling the auxiliary power supply 15 to provide the starting voltage for the charging starting unit after receiving the starting voltage provided by the charging starting unit, and simultaneously controlling the auxiliary power supply 15 to cut off power supply to the switching power supply when detecting that the circuit of the switching power supply is failed.
Specifically, when the control unit 13 detects that the switching power supply fails, the control unit 13 stops receiving the starting voltage provided by the auxiliary power supply 15 and turns off the power supply to the charging adjustment unit 14, so that the charging adjustment unit 14 can maintain a high voltage for a certain time after the control unit 13 turns off the power supply, so that the charging adjustment unit 14 continues to maintain the short-circuit effect on the charging starting unit 12, and the preceding-stage input unit 11 cannot immediately provide a voltage for the charging starting unit 12; after the auxiliary power supply 15 stops providing the starting voltage for the control unit, the charging starting unit 12 will correspondingly continue to provide the voltage for the control unit 13 due to a certain energy storage function, and the control unit 13 will be turned off at this time because the starting voltage for the control unit 13 cannot be maintained after discharging; then, the charging adjustment unit 14 does not maintain the short-circuit effect on the charging start unit 12, so that the charging start unit 12 recovers the input voltage to the control unit 13, so that the voltage in the charging start unit 12 is not reduced, and then provides the start voltage for the control unit 13 to rapidly restart the control unit 13, so that it can be known that the above process provides sufficient time for the charging start unit 12 to reduce the voltage, and the combination of the two ensures that the control unit 13 can be rapidly turned off. In addition, after the control unit 13 is restarted, if the circuit failure has not been eliminated, the above-described process is repeated.
When the circuit fault is eliminated, the switching power supply needs to be restarted, and in the process, the control unit 13 is restarted in advance, so that the problem that the control unit 13 cannot be shut down and further cannot be restarted due to overhigh power supply voltage of the charging starting unit 12 can not occur during secondary restarting, the restarting speed after recovery from the fault is greatly improved, and the convenience of a user is improved.
As a further example, the charge starting unit 12 includes a resistor R1 and a capacitor C1; one end of the resistor R1 is connected to the output end of the pre-stage input unit 11, the other end of the resistor R1 is connected to one end of the capacitor C1 and the start signal end of the control unit 13, and the other end of the capacitor C1 is grounded. The capacitor C1 can store energy so that the speed of charging the control unit 13 by the preceding stage input unit 11 is not too fast, and the voltage of the whole power supply can be relatively smooth.
As a further embodiment, as shown in fig. 3, the charge starting unit 12 further includes a diode D1; the charge starting unit 12 further comprises a diode D1; the anode of the diode D1 is connected to the other end of the resistor R1, and the cathode of the diode D1 is connected to one end of the capacitor C1. When the voltage input by the front-stage input unit 11 is an ac voltage, the resistor R1 needs to be connected in series with a diode D1 to convert the alternating current with alternating direction into a single-direction pulse direct current, so as to avoid the reverse output of current.
As a further embodiment, the charging adjustment unit 14 includes a switch Q1, a capacitor C2, and a diode D2; the charging signal end of the control unit 13 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to one end of the capacitor C2, one end of the capacitor C2 is connected to the gate G of the switch tube Q1, the other end of the capacitor C2 and the drain D of the switch tube Q1 are both grounded, and the source S of the switch tube Q1 is connected to the other end of the resistor R1. When the voltage of the control unit 13 reaches the start voltage, the control unit 13 starts to operate normally, and simultaneously outputs a charging signal to the capacitor C2 through the diode D2 for charging, and when the voltage of the capacitor C2 satisfies the turn-on voltage of the switch tube Q1, the switch tube Q1 is turned on, so that the charging adjustment unit 14 and the charging start unit 12 are turned on, and further the charging start unit 12 stops charging the control unit 13, and outputs the voltage to the ground through the switch tube Q1, at this time, the auxiliary unit starts to provide the start voltage for the controlled unit.
If the control unit 13 detects that the circuit is faulty, the control unit 13 turns off the driving signal and turns off the charging of the capacitor C2, and at the same time, the auxiliary power supply 15 turns off the power supply to the control unit 13, because the capacitor C1 can still maintain a high voltage in a short time, the switch Q1 still remains on, and the charging adjustment unit 14 can remain on with the charging start unit 12 in a short time, so that the preceding stage input unit 11 does not immediately resume the power supply to the charging start unit 12, and sufficient time is provided for the charging start unit 12 to reduce the voltage, and further, the control unit 13 can be turned off and restarted quickly.
As a further embodiment, the type of the switching tube Q1 is NMOS. The type of the switch Q1 and the type of the switch Q1 are NMOS, or NPN transistors, and the specific type is not limited herein.
As shown in fig. 4, in a further embodiment, the charging adjustment unit 14 further includes a resistor R2, one end of the resistor R2 is connected to the cathode of the diode D2, and the other end of the resistor R2 is connected to the gate G of the switching transistor Q1.
As shown in fig. 5, in a further embodiment, the charging adjustment unit 14 further includes a resistor R3, and the resistor R3 is connected in parallel with the capacitor C2.
As shown in fig. 6, in a further embodiment, the charging adjustment unit 14 further includes a resistor R4, one end of the resistor R4 is connected to the cathode of the diode D2, and the other end of the resistor R4 is connected to one end of the resistor R2. The resistors R2, R3, and R4 are used to adjust the time for maintaining the high voltage of the capacitor C2, so as to control the on time of the switching tube Q1 to meet different practical requirements, and the specific positions and connection modes of the resistors R2, R3, and R4 in the circuit are not limited herein.
As shown in fig. 7, as a further embodiment, the pre-stage input unit 11 specifically includes an AC input module 111, a lightning protection module 112, an EMI filter module 113, and an input rectification module 114; the input end of the AC input module 111 is connected to the output end of the external power supply, the output end of the AC input module 111 is connected to the input end of the lightning protection module 112, the output end of the lightning protection module 112 is connected to the input end of the EMI filter module 113, the output end of the EMI filter module 113 is connected to the input end of the input rectifier module 114, and the output end of the input rectifier module 114 is connected to the input end of the charging start unit 12. The AC input module 111 is used for providing AC power for the subsequent circuits, the lightning protection module 112 is used for preventing surge, the EMI filter module 113 is used for filtering signals, and the input rectifier module 114 is used for converting AC power into dc power.
The embodiment of the invention also discloses a switching power supply, which comprises the quick starting circuit, wherein the quick starting circuit comprises a preceding stage input unit 11, a charging starting unit 12, a charging adjusting unit 14, an auxiliary power supply 15 and a control unit 13; the preceding stage input unit 11 is used for connecting with an external power supply to provide a starting voltage for the control unit 13 through the charging starting unit 12; when the control unit 13 receives the start voltage, the auxiliary power supply 15 is turned on to provide the start voltage for the control unit 13 through the auxiliary power supply 15, and the control unit 13 generates a charging signal to charge the charging adjustment unit 14, so that the charging adjustment unit 14 adjusts the charging start unit 12 to a short-circuit state, and the control unit 13 further generates a corresponding driving signal to drive an external device to operate; when the control unit 13 detects that the output of the switching power supply fails, the control unit 13 turns off the starting voltage provided by the auxiliary power supply 15 to stop generating the charging signal and the driving signal, so that the charging adjustment unit 14 adjusts the charging starting unit 12 to the on state, and provides the starting voltage for the control unit 13 again to restart the control unit 13.
Meanwhile, the quick start circuit may also be the quick start circuit described in any of the embodiments, and specific electrical elements, connection modes of devices, and specific operating principles of the quick start circuit have been described in detail in the embodiments, and are not described herein again.
In summary, in the embodiment of the present invention, the control unit 13 controls the start and the shutdown of the charging adjustment unit 14, so as to adjust the voltage of the charging start unit 12, and further enable the control unit 13 to be capable of quickly shutting down and restarting, so that when the switching power supply is restarted for the second time, the lock protection cannot occur due to the over-high power supply voltage of the control unit 13, and thus the restart cannot be shut down, that is, the control unit 13 can be restarted quickly, and the normal operation is resumed, thereby greatly improving the convenience.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A quick start circuit is characterized in that the quick start circuit is applied to a switching power supply and comprises a preceding stage input unit, a charging start unit, a charging adjusting unit, an auxiliary power supply and a control unit;
the front stage input unit is used for being connected with an external power supply so as to provide starting voltage for the control unit through the charging starting unit; when the control unit receives a starting voltage, the auxiliary power supply is switched on to provide the starting voltage for the control unit through the auxiliary power supply, and the control unit generates a charging signal to charge the charging adjustment unit, so that the charging adjustment unit adjusts the charging starting unit to a short-circuit state, and the control unit also generates a corresponding driving signal to drive the external equipment to work; when the control unit detects that the output fault of the switching power supply occurs, the control unit cuts off the starting voltage provided by the auxiliary power supply to stop generating the charging signal and the driving signal, so that the charging adjusting unit adjusts the charging starting unit to be in a connected state, and provides the starting voltage for the control unit again to restart the control unit.
2. The quick start circuit of claim 1, wherein said charge start unit comprises a resistor R1 and a capacitor C1;
one end of the resistor R1 is connected with the output end of the preceding stage input unit, the other end of the resistor R1 is respectively connected with one end of the capacitor C1 and the starting signal end of the control unit, and the other end of the capacitor C1 is grounded.
3. The quick start circuit of claim 2, wherein said charge start unit further comprises a diode D1;
the anode of the diode D1 is connected to the other end of the resistor R1, and the cathode of the diode D1 is connected to one end of the capacitor C1.
4. The fast start circuit of claim 3, wherein the charge adjustment unit comprises a switch transistor Q1, a capacitor C2, and a diode D2;
the charging signal end of the control unit is connected with the anode of the diode D2, the cathode of the diode D2 is connected with one end of the capacitor C2, one end of the capacitor C2 is connected with the gate of the switch tube Q1, the other end of the capacitor C2 and the drain of the switch tube Q1 are both grounded, and the source of the switch tube Q1 is connected with the other end of the resistor R1.
5. The fast start-up circuit of claim 4, wherein the switching transistor Q1 is NMOS type.
6. The fast start circuit as claimed in claim 4, wherein the charge adjusting unit further comprises a resistor R2, one end of the resistor R2 is connected to the cathode of the diode D2, and the other end of the resistor R2 is connected to the gate of the switch transistor Q1.
7. The fast start circuit of claim 6, wherein said charge adjustment unit further comprises a resistor R3, said resistor R3 being connected in parallel with said capacitor C2.
8. The fast start circuit of claim 7, wherein the charge adjustment unit further comprises a resistor R4, one end of the resistor R4 is connected to the cathode of the diode D2, and the other end of the resistor R4 is connected to one end of the resistor R2.
9. The fast start-up circuit of claim 1, wherein the pre-stage input unit comprises in particular an AC input module, a lightning protection module, an EMI filtering module and an input rectification module; the input end of the AC input module is connected with the output end of the external power supply, the output end of the AC input module is connected with the input end of the lightning protection module, the output end of the lightning protection module is connected with the input end of the EMI filtering module, the output end of the EMI filtering module is connected with the input end of the input rectifying module, and the output end of the input rectifying module is connected with the input end of the charging starting unit.
10. A switching power supply is characterized by comprising a quick start circuit, wherein the quick start circuit comprises a preceding stage input unit, a charging start unit, a charging adjustment unit, an auxiliary power supply and a control unit;
the front stage input unit is used for being connected with an external power supply so as to provide starting voltage for the control unit through the charging starting unit; when the control unit receives a starting voltage, the auxiliary power supply is switched on to provide the starting voltage for the control unit through the auxiliary power supply, and the control unit generates a charging signal to charge the charging adjustment unit, so that the charging adjustment unit adjusts the charging starting unit to a short-circuit state, and the control unit also generates a corresponding driving signal to drive the external equipment to work; when the control unit detects that the output fault of the switching power supply occurs, the control unit cuts off the starting voltage provided by the auxiliary power supply to stop generating the charging signal and the driving signal, so that the charging adjusting unit adjusts the charging starting unit to be in a connected state, and provides the starting voltage for the control unit again to restart the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010227463.7A CN111245214A (en) | 2020-03-27 | 2020-03-27 | Quick start circuit and switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010227463.7A CN111245214A (en) | 2020-03-27 | 2020-03-27 | Quick start circuit and switching power supply |
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| CN111245214A true CN111245214A (en) | 2020-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865062A (en) * | 2020-07-20 | 2020-10-30 | 深圳英飞源技术有限公司 | Auxiliary power supply starting circuit based on single-phase/three-phase booster circuit |
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2020
- 2020-03-27 CN CN202010227463.7A patent/CN111245214A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865062A (en) * | 2020-07-20 | 2020-10-30 | 深圳英飞源技术有限公司 | Auxiliary power supply starting circuit based on single-phase/three-phase booster circuit |
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