CN111030469B - High-voltage power supply circuit - Google Patents
High-voltage power supply circuit Download PDFInfo
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- CN111030469B CN111030469B CN201911368819.2A CN201911368819A CN111030469B CN 111030469 B CN111030469 B CN 111030469B CN 201911368819 A CN201911368819 A CN 201911368819A CN 111030469 B CN111030469 B CN 111030469B
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a high-voltage power supply circuit, which comprises a primary circuit, a transformer T1 and a secondary circuit, wherein the primary circuit consists of a voltage-sharing transformer T2, a first capacitor C1, a second capacitor C2, a first switch tube Q1 and a second switch tube Q2, the voltage of the switch tube Q1 and the switch tube Q2 is automatically balanced through the voltage-sharing transformer T2, energy is transmitted to the secondary circuit through a transformer T1 for power transmission, the voltage of the switch tubes is balanced in the energy transmission process, the efficiency and the EMI performance of the high-voltage power supply circuit are improved, and the reliability of the high-voltage power supply circuit is effectively improved.
Description
Technical Field
The present invention relates to a high voltage power circuit, and more particularly, to a voltage equalizer circuit for a DC-DC or DC-AC high voltage power circuit.
Background
With the rapid development of new energy industries, the industries such as electric vehicles, wind power generation, photovoltaics and the like have more and more requirements and more severe requirements on switching power supplies with ultra-high and ultra-wide input voltage ranges, the input voltage range of a power supply used by a charging pile in the electric vehicle industry is required to be 200 VDC-800 VDC, and some requirements reach the upper limit of 1000 VDC; the power supply products used by photovoltaic combiner boxes, inverters and the like in the wind power generation and photovoltaic industries require an input voltage range of 150 VDC-1500 VDC. With the continuous improvement of voltage, in order to solve the problem of overhigh voltage stress of a switching tube of a power supply, in a common method for reducing the voltage stress of the switching tube, a three-level converter and a module series connection technology are researched and applied more. For the three-level or multi-level technology, although the stress of the device can be effectively reduced, with the increase of the switching devices, the control strategy and the driving of the switching devices become complicated with the increase of the number of the devices, and meanwhile, the three-level technology also has the problem of more stress unevenness, and in order to solve the problems, a plurality of solutions are provided, but the solutions undoubtedly increase the complexity of the circuit, and the related cost and complexity are increased on the occasion that the requirement of the auxiliary power supply is higher. For the module series technology, although the output power capacity of a single converter is limited, the total output power capacity can be increased by adopting the mode of connecting the converters in series, in an actual circuit, the parameters of the converters connected in series inevitably have discreteness, and meanwhile, related devices have certain differences, which may cause the working voltage of an upper switching tube and a lower switching tube to deviate, even exceed the withstand voltage value of the switching tubes, so that the converters cannot work safely. Therefore, in the circuit structure of the series connection of the converters, the converter can be safely and reliably operated only by ensuring that the switching tubes and related devices can equally distribute the input voltage for voltage sharing, and the voltage sharing technology related to the converter is also the key point, and the reliability of the product can be ensured only by voltage sharing.
Fig. 1 is a series circuit diagram of a known converter with an automatic voltage-equalizing function, and the circuit structure is disclosed in the design of a high-voltage-tolerant overlap flyback DC-DC converter in the 5 th phase of 2001 in the journal of electrical engineering. When the switch is static, no voltage drop is generated on loop impedance, and the voltages of the C1 and the C2 and the upper and lower converters are equal; however, during switching, differential voltage drops occur in the differential loop impedances, which results in non-uniform voltages across the upper and lower switching tubes. The main defects are also obvious, for example, due to the difference of parameters, the peak current of the switching device has a large difference, and then the voltage stress of the switching device has a large difference, and meanwhile, the temperature rise of the switching device also has a certain difference, so that related personnel provide a method for solving related problems on the basis, and the main method is shown in fig. 2. The current of the upper tube and the lower tube of the switching device in each switching period has a better current equalizing effect by increasing a certain resistor, so that the problems of temperature rise and voltage of the device are solved. However, in the scheme, a certain voltage automatic compensation is generated by using the resistor, the difference caused by the discreteness of the device parameters can only be compensated to a certain extent, the resistance value of the resistor needs to be increased along with the increase of the difference, the increased resistor dissipates larger power consumption along with the increase of the input power supply power, and the resistor which is increased simultaneously at the time of starting up serves as the ESR (equivalent series resistance) of the capacitor to a certain extent, so that the problem of EMI (electro magnetic interference) can be caused.
Disclosure of Invention
In view of the above, the present invention provides a high voltage power circuit to solve the above problems, which can achieve automatic voltage equalization and current equalization, reduce power dissipation, and improve reliability of the circuit.
The invention aims to realize the purpose, and the high-voltage power supply circuit comprises a primary circuit, a transformer T1 and a secondary circuit, wherein the primary circuit comprises a capacitor C1, a capacitor C2, a voltage-sharing transformer T2, a switching tube Q1, a switching tube Q2 and a resistor R1; the dotted terminal of the first winding N1 of the transformer T1 and one end of the capacitor C1 are connected to the positive in + of the input terminal, the unlike terminal of the first winding N1 of the transformer T1 is connected to the drain of the switch tube Q1, the source of the switch tube Q1 is connected to the dotted terminal of the third winding N3 of the voltage-sharing transformer T2, the unlike terminal of the third winding N3 of the voltage-sharing transformer T2 is connected to the other end of the capacitor C1, and this connection point is called a first connection point; the dotted terminal of the second winding N2 of the transformer T1 is connected with the dotted terminal of the fourth winding N4 of the voltage-sharing transformer T2, the dotted terminal of the fourth winding N4 of the voltage-sharing transformer T2 is connected with one end of the capacitor C2, the connection point is called a second connection point, the dotted terminal of the second winding N2 of the transformer T1 is connected with the drain of the switch tube Q2, the source of the switch tube Q2 is connected with one end of the resistor R1, the other end of the resistor R1 and the other end of the capacitor C2 are connected with the input end negative in-, and the first connection point is connected with the second connection point.
Preferably, the primary circuit further comprises a capacitor C3 and a capacitor C4, one end of the capacitor C3 is connected with the positive in-input terminal, the other end of the capacitor C3 is connected with the dotted terminal of the third winding N3 of the voltage-sharing transformer T2, one end of the capacitor C4 is connected with the dotted terminal of the fourth winding N4 of the voltage-sharing transformer T2, and the other end of the capacitor C4 is connected with the negative in-input terminal.
As a specific embodiment of the secondary side circuit, the secondary side circuit is connected to form a flyback circuit, and specifically, the secondary side circuit includes a diode D1 and an output capacitor Co, the different name terminal of the output winding of the transformer T1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the anode of the output capacitor Co as the positive output terminal Vo +, and the cathode of the output capacitor Co is connected to the same name terminal of the output winding of the T1 as the negative output terminal Vo-.
As another specific embodiment of the secondary circuit, the secondary circuit is connected to form a forward circuit, and specifically, the secondary circuit includes a diode D1, a diode D2, an inductor L1 and an output capacitor Co, the dotted terminal of the output winding of the transformer T1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to one end of the inductor L1, the connection point is connected to the cathode of the diode D2, the other end of the inductor L1 is connected to the anode of the output capacitor Co as the positive output terminal Vo +, and the cathode of the output capacitor Co and the anode of the diode D2 are connected to the dotted terminal of the output winding of the transformer T1 as the negative output terminal Vo-.
The working principle of the invention is explained in detail in the embodiment, and the working principle is briefly described as follows:
when a voltage difference exists between the capacitor C1 and the capacitor C2, since the first winding N1 and the second winding N2 in the transformer T1 are tightly coupled, the leakage inductance is very small and can be ignored, when the switching tubes Q1 and Q2 are turned on, the same voltage appears in the first winding N1 and the second winding N2 and is substantially equal to each other, if the voltage of the capacitor C1 is higher than the voltage of the capacitor C2, the third winding N3 generates a voltage which is positive and negative at the same end, and at the same time, a voltage which is negative at the positive and negative at the same end is also induced in the fourth winding N4, the originally lower voltage in the capacitor C2 is applied to the second winding N2 after the voltage generated in the fourth winding N4 is superimposed, and the voltage equalization of the first winding N1 and the second winding N2 is realized through the automatic adjustment of the voltage equalizing transformer T2, so as to realize the automatic voltage equalization of the switching tube Q1 and the switching tube Q2.
The invention has the following beneficial effects:
1. automatic voltage sharing and current sharing can be realized by adding a voltage sharing transformer T2 in the series converter;
2. due to the adoption of transformer coupling, the impedance balance is automatically realized through the transformer due to the difference caused by the circuit parameter discreteness, the loss caused by resistance is reduced, and the product efficiency is improved;
3. the transformer in the circuit is equivalent to a voltage source, and the EMI performance of the product is improved.
Drawings
FIG. 1 is a schematic diagram of a series circuit of a conventional converter with automatic voltage-equalizing function;
FIG. 2 is a schematic diagram of an improved converter series circuit with automatic voltage equalization;
FIG. 3 is a circuit diagram of a first embodiment of the present invention;
FIG. 4 is a circuit diagram of a second embodiment of the present invention;
FIG. 5 is a circuit diagram of a third embodiment of the present invention;
FIG. 6 is a circuit diagram of a fourth embodiment of the present invention.
Detailed Description
First embodiment
Fig. 3 shows a circuit diagram of the first embodiment, which includes a primary side circuit composed of an input voltage in +, an input voltage in-, a voltage-sharing transformer T2, a first capacitor C1, a second capacitor C2, a first switch tube Q1, and a second switch tube Q2, a secondary side circuit composed of a transformer T1, a resistor R1, a diode D1, and an output capacitor Co. In a primary side circuit, an input voltage in + is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a capacitor C2, the other end of the capacitor C1 is simultaneously connected with a synonym end of a third winding N3 and a synonym end of a fourth winding N4 in a voltage-sharing transformer T2, and the other end of the capacitor C2 is connected with an input voltage in-; the dotted terminal of the first winding N1 in the transformer T1 is connected with the input voltage in +, the different-dotted terminal of the first winding N1 is connected with the drain of a switch tube Q1 (assumed to be NMOS), and the source of the switch tube Q1 is connected with the dotted terminal of the third winding N3 in the voltage-sharing transformer T2; the dotted terminal of a second winding N2 in the transformer T1 is connected with the dotted terminal of a fourth winding N4 in the voltage-sharing transformer T2, the synonym terminal of the second winding N2 is connected with the drain of a switch tube Q2 (assumed to be NMOS), the source of the switch tube Q2 is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with an input voltage in-; in the secondary side circuit, the different name end of the output winding of the transformer T1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the anode of the capacitor Co, and the cathode of the capacitor Co is connected with the same name end of the output winding of the transformer T1.
The working principle of the embodiment is as follows:
when the input voltage in + is added to a circuit formed by connecting the capacitor C1 and the capacitor C2 in series, current flows through the capacitor C1 and the capacitor C2 to store energy, the capacitor C1 and the capacitor C2 divide the input voltage in + into partial voltages, the partial voltages can be obtained according to the series connection of the capacitors, and if the parameters of the capacitors C1 and C2 are completely consistent, half of the voltage of in + is obtained by dividing each of the capacitors C1 and C2. The same driving signal is adopted for driving the switching tube Q1 and the switching tube Q2, the mutual delay is basically ignored, the first winding N1 and the second winding N2 are tightly coupled, the voltages applied to the first winding N1 and the second winding N2 are equal in size, the first winding N1 generates a voltage which is positive and negative up and down according to the same name end relation, the second winding N2 also induces a voltage which is positive and negative up and down, meanwhile, the voltage applied to the third winding N3 is distributed according to the inductance of the first winding N1 and the third winding N3, a voltage which is positive left and negative right is induced on the third winding N3, and the voltage of the capacitor C1 is the sum of the voltages of the first winding N1 and the third winding N3; since the third winding N3 and the fourth winding N4 are tightly coupled and have equal inductance, the fourth winding N4 induces a voltage equal to the third winding N3, the induced voltage of the fourth winding N4 is left negative and right positive, the voltage of the fourth winding N4 is superposed with the voltage of the capacitor C2 according to the loop voltage and is equal to the voltage of the second winding N2, and therefore the voltage induced by the equalizer transformer T2 on the third winding N3 is zero, and the voltage of the fourth winding N4 is also zero.
When the parameters of the capacitor C1 and the capacitor C2 are different, assuming that the capacitance value of the capacitor C1 is smaller than that of the capacitor C2, the voltage of the capacitor C1 is larger than that of the capacitor C2 according to the serial voltage division of the capacitors. When the switch tube Q1 and the switch tube Q2 are turned on, the voltages applied to the first winding N1 and the second winding N2 are equal, the first winding N1 generates positive, negative, and positive, negative voltages, and the second winding N2 also induces positive, negative, and negative voltages, and meanwhile, the third winding N3 induces positive, negative, and positive voltages, and the voltage of the capacitor C1 is also the sum of the voltages of the first winding N1 and the third winding N3; the voltage equal to the voltage of the third winding N3 is induced by the fourth winding N4, the induced voltage of the fourth winding N4 is positive left negative right, the voltage of the capacitor C2 is superposed with the voltage of the fourth winding N4 and is equal to the voltage of the second winding N2 according to the loop voltage, therefore, the voltage induced by the voltage-sharing transformer T2 on the third winding N3 is half of the voltage difference between the capacitor C1 and the capacitor C2, the voltage of the fourth winding N4 is the same as the voltage of the third winding N3, the voltage-sharing transformer T2 realizes automatic voltage balance, if a material with high magnetic permeability is adopted, the exciting current of the voltage-sharing transformer T2 is very small compared with the working current, and the function of automatic current sharing can be realized at the same time.
When the parameters of the capacitor C1 and the capacitor C2 are different, assuming that the capacitance value of the capacitor C1 is larger than that of the capacitor C2, the voltage of the capacitor C2 is larger than that of the capacitor C1 according to the serial voltage division of the capacitors. When the switch tube Q1 and the switch tube Q2 are turned on, the voltages applied to the first winding N1 and the second winding N2 are equal, the second winding N2 generates positive, negative, and negative, respectively, are induced on the first winding N1, and meanwhile, positive, right, and negative voltages are induced on the fourth winding N4, and the voltage of the capacitor C2 is also the sum of the voltages of the second winding N2 and the fourth winding N4; the voltage equal to the voltage of the fourth winding N4 is induced by the third winding N3, the induced voltage of the third winding N3 is positive left and negative right, the voltage of the capacitor C1 is superposed with the voltage of the third winding N3 and is equal to the voltage of the first winding N1 according to the loop voltage, so that the voltage induced by the voltage-sharing transformer T2 on the fourth winding N4 is half of the voltage difference between the capacitor C2 and the capacitor C1, the voltage of the fourth winding N4 is the same as that of the third winding N3, the voltage-sharing transformer T2 realizes automatic voltage balance, and if a material with high magnetic permeability is adopted, the exciting current of the voltage-sharing transformer T2 is small compared with the working current, and the automatic current sharing function can be realized at the same time.
The transformer T1 works as a flyback mode in the circuit, that is, energy is stored when the switching tubes Q1 and Q2 are turned on, the output energy is provided by the capacitor Co, energy is released when the switching tube Q1 and the switching tube Q2 are turned off, and the released energy is stored in the capacitor Co and is transmitted to the output end.
Second embodiment
Fig. 4 shows a circuit diagram of the second embodiment, which differs from the first embodiment in that: the embodiment further comprises a capacitor C3 and a capacitor C4, wherein one end of the capacitor C3 is connected with an input terminal positive in +, the other end of the capacitor C3 is connected with a dotted terminal of a third winding N3 of the voltage-sharing transformer T2, one end of the capacitor C4 is connected with a dotted terminal of a fourth winding N4 of the voltage-sharing transformer T2, and the other end of the capacitor C4 is connected with an input terminal negative in-.
The present embodiment is a simple modification of the first embodiment, and has the same working principle as the first embodiment, and details are not described herein.
Third embodiment
Fig. 5 shows a circuit diagram of the third embodiment, which differs from the first embodiment in that: the secondary side circuit comprises a diode D1, a diode D2, an inductor L1 and a capacitor Co, and the connection relationship is as follows: the dotted terminal of the output winding of the transformer T1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with one end of the inductor L1, the connection point of the diode D2 is connected with the cathode of the inductor L1, the other end of the inductor L1 is connected with the anode of the output capacitor Co as the positive output terminal Vo +, the cathode of the output capacitor Co and the anode of the diode D2 are connected with the dotted terminal of the output winding of the transformer T1 as the negative output terminal Vo-.
The working principle of this embodiment is the same as that of the first embodiment, and will not be described herein.
The transformer T1 operates in a forward mode in the circuit, i.e. when the switching tubes Q1, Q2 are switched on, energy is transferred, the output is supplied through the inductor L1 while part of the energy is stored in the capacitor Co, in Q1 and Q2 energy is released from the inductor L1, the released energy is stored in the capacitor Co while being transferred to the output, and the capacitor Co supplies energy when the inductor is insufficiently supplied.
Fourth embodiment
Fig. 6 shows a circuit diagram of a fourth embodiment, which differs from the third embodiment in that: the embodiment further comprises a capacitor C3 and a capacitor C4, wherein one end of the capacitor C3 is connected with an input terminal positive in +, the other end of the capacitor C3 is connected with a dotted terminal of a third winding N3 of the voltage-sharing transformer T2, one end of the capacitor C4 is connected with a dotted terminal of a fourth winding N4 of the voltage-sharing transformer T2, and the other end of the capacitor C4 is connected with an input terminal negative in-.
The working principle of this embodiment is the same as that of the first embodiment, and is not described herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and it will be apparent to those skilled in the art that several modifications and decorations, such as a change of the capacitance balance converter to a forward mode or other modes, can be made without departing from the spirit and scope of the present invention; such modifications and decorations shall be considered as the protection scope of the present invention, which shall not be described herein by way of example, and shall be subject to the limitations defined by the claims.
Claims (6)
1. A high-voltage power supply circuit comprises a primary circuit, a transformer T1 and a secondary circuit, and is characterized in that: the primary side circuit comprises a capacitor C1, a capacitor C2, a voltage-sharing transformer T2, a switching tube Q1, a switching tube Q2 and a resistor R1; the dotted terminal of the first winding N1 of the transformer T1 and one end of the capacitor C1 are connected to the positive in + of the input terminal, the unlike terminal of the first winding N1 of the transformer T1 is connected to the drain of the switch tube Q1, the source of the switch tube Q1 is connected to the dotted terminal of the third winding N3 of the voltage-sharing transformer T2, the unlike terminal of the third winding N3 of the voltage-sharing transformer T2 is connected to the other end of the capacitor C1, and this connection point is called a first connection point; the dotted terminal of the second winding N2 of the transformer T1 is connected with the dotted terminal of the fourth winding N4 of the voltage-sharing transformer T2, the dotted terminal of the fourth winding N4 of the voltage-sharing transformer T2 is connected with one end of the capacitor C2, the connection point is called a second connection point, the dotted terminal of the second winding N2 of the transformer T1 is connected with the drain of the switch tube Q2, the source of the switch tube Q2 is connected with one end of the resistor R1, the other end of the resistor R1 and the other end of the capacitor C2 are connected with the input end negative in-, and the first connection point is connected with the second connection point.
2. The high-voltage power supply circuit according to claim 1, wherein: the primary side circuit further comprises a capacitor C3 and a capacitor C4, one end of the capacitor C3 is connected with an input end positive in +, the other end of the capacitor C3 is connected with a dotted end of a third winding N3 of a voltage-sharing transformer T2, one end of the capacitor C4 is connected with a dotted end of a fourth winding N4 of the voltage-sharing transformer T2, and the other end of the capacitor C4 is connected with an input end negative in-.
3. The high-voltage power supply circuit according to claim 1 or 2, characterized in that: the secondary side circuit comprises a diode D1 and an output capacitor Co, the unlike terminal of the output winding of the transformer T1 is connected with the anode of a diode D1, the cathode of a diode D1 is connected with the anode of the output capacitor Co as the positive output terminal Vo +, and the cathode of the output capacitor Co is connected with the like terminal of the output winding of the T1 as the negative output terminal Vo-.
4. The high-voltage power supply circuit according to claim 1 or 2, characterized in that: the secondary side circuit comprises a diode D1, a diode D2, an inductor L1 and an output capacitor Co, wherein the dotted terminal of the output winding of the transformer T1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with one end of the inductor L1, the connection point of the diode D1 and the cathode of the diode D2 are connected, the other end of the inductor L1 is connected with the anode of the output capacitor Co to serve as the positive output end Vo +, the cathode of the output capacitor Co and the anode of the diode D2 are connected with the dotted terminal of the output winding of the transformer T1 to serve as the negative output end Vo-.
5. The high-voltage power supply circuit according to claim 1 or 2, characterized in that: the first winding N1 of the transformer T1 and the second winding N2 of the transformer T1 have the same winding and are tightly coupled; the third winding N3 of the voltage equalizing transformer T2 and the fourth winding N4 of the voltage equalizing transformer T2 have the same winding and are tightly coupled.
6. The high-voltage power supply circuit according to claim 5, wherein: the inductance of the transformer T1 is larger than that of the voltage-sharing transformer T2.
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| CN101707838A (en) * | 2009-12-04 | 2010-05-12 | 英飞特电子（杭州）有限公司 | Multipath LED constant current drive circuit suitable for non-isolated converter |
| CN101902139A (en) * | 2010-07-22 | 2010-12-01 | 浙江大学 | Modularized multiple constant current output converter |
| CN203554299U (en) * | 2013-11-25 | 2014-04-16 | 深圳市步科电气有限公司 | High-voltage input flyback switching power supply |
| CN104218807A (en) * | 2014-08-22 | 2014-12-17 | 国家电网公司 | High-voltage-resistant switching power supply |
| CN109004837A (en) * | 2018-07-13 | 2018-12-14 | 广州金升阳科技有限公司 | High voltage flyback converter |
| CN109004838A (en) * | 2018-07-13 | 2018-12-14 | 广州金升阳科技有限公司 | High voltage flyback converter |
| CN208767975U (en) * | 2018-09-25 | 2019-04-19 | 上海钧功电子科技有限公司 | A kind of tandem type flyback converter |
| CN109861538A (en) * | 2019-03-27 | 2019-06-07 | 深圳市安健科技股份有限公司 | A kind of automatic current equalizing circuit in shunt transformer primary side series connection common mode inductance |
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