CN107276393B - High-voltage power supply circuit - Google Patents

High-voltage power supply circuit Download PDF

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Publication number
CN107276393B
CN107276393B CN201710610406.5A CN201710610406A CN107276393B CN 107276393 B CN107276393 B CN 107276393B CN 201710610406 A CN201710610406 A CN 201710610406A CN 107276393 B CN107276393 B CN 107276393B
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capacitor
converter
output
input
negative
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CN107276393A (en
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宋建峰
金若愚
申志鹏
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Mornsun Guangzhou Science and Technology Ltd
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Mornsun Guangzhou Science and Technology Ltd
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Publication of CN107276393A publication Critical patent/CN107276393A/en
Priority to PCT/CN2018/088026 priority patent/WO2019019784A1/en
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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
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load

Abstract

The invention discloses a high-voltage power supply circuit, which realizes automatic equalization of the voltages of two capacitors at an input end through a DC-DC converter for balancing the voltages, transfers energy to a secondary side through a DC-DC converter for power transfer, balances the voltage equalization of series capacitors while realizing energy transfer, and solves the problems of difficult device shape selection, high cost and complex control during wide-range high-voltage input; in the application of a switching auxiliary power supply with wide range and high input voltage, the cost of the product is reduced, and the reliability is improved.

Description

High-voltage power supply circuit
Technical Field
The invention relates to the field of switching converters, in particular to a switching converter for converting high-voltage power.
Background
The field of power electronics is rapidly developing, so that the application of high-frequency switching power supplies is more and more widespread. The input end of the traditional industrial and civil switch power supply is often required to be powered from a power grid, and is changed into higher direct current after passing through a rectifying and filtering circuit in the power supply, and then is input into a power conversion circuit to be changed into low-voltage direct current so as to supply electric energy for a load. In order to adapt to the power grid standards of different countries, the input voltage range of a general two-phase alternating current input switching power supply is 85-264 VAC, and the direct current voltage after rectification and filtration is about 120-373 VDC. The switching power supply used in the occasion has more circuit topologies for selection according to different powers, such as flyback and forward circuits with the characteristics of simple structure, low cost and the like; structurally complex, but with soft switching functionality, LLC, asymmetric half-bridge, phase-shifted full-bridge circuits, etc.
With the rapid development of new energy industry, the industries of electric automobiles, wind power generation, photovoltaics and the like have more and more demands on switching power supplies with ultra-high and ultra-wide input voltage ranges, and the demands are more and more stringent. The power supply required input voltage range of the charging pile used in the electric automobile industry is 200 VDC-800 VDC, and some requirements reach the upper limit of 1000 VDC; the input voltage range of power supply products used in photovoltaic combiner boxes, inverters and the like in the wind power generation and photovoltaic industry is required to reach 150-1500 VDC. With the increasing voltage, higher requirements are also put on the auxiliary power supply DC-DC converter to be supplied, and at the same time, the choice of devices for the DC-DC converter is also a great deal of problem. For example, the on-resistance of the main switching device mosfet becomes much larger along with the voltage rise, which inevitably leads to larger on-loss, further resulting in efficiency reduction and thermal design problems.
In order to reduce the voltage stress of the switching tube, three-level converter and module series technology are more researched and applied. For the three-level or multi-level technology, although the stress of the device can be reduced, as the number of the switching devices increases, the control strategy and the driving also become complex along with the increase of the number of the devices, and meanwhile, the three-level technology also has more uneven stress problems, so that a plurality of solutions are provided for solving the problems, the solutions certainly increase the complexity of a circuit, and the cost and the complexity are increased in the occasion with higher auxiliary power supply requirements; for the multi-module serial technology, although a single module is simple, a relatively complex control strategy is adopted to meet the problems of voltage sharing, dynamic state and the like.
For the auxiliary power supply DC-DC conversion, the technologies can reduce the stress of devices, but the control strategy of the product is complex, and the reliability and the cost of the product are greatly affected.
Disclosure of Invention
In view of the above, the present invention provides a high-voltage power circuit applied to a wide-range and high-input voltage power supply, which simplifies product design and product control and improves product reliability.
The object of the invention is achieved by a high voltage power circuit for converting high voltage power to low voltage power, comprising: the input positive electrode, the input negative electrode, the first capacitor, the second capacitor, the first DC-DC converter and the output DC-DC converter.
The input positive electrode is connected with the positive end of the first capacitor, the negative end of the first capacitor is connected with the positive end of the second capacitor, and the negative end of the second capacitor is connected with the input negative electrode;
the input of the first DC-DC converter is positively connected with the positive end of the first capacitor, the input of the first DC-DC converter is negatively connected with the negative end of the first capacitor, the output of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the second capacitor;
the input of the output DC-DC converter is positively connected with the positive end of the second capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the second capacitor, and the output of the output DC-DC converter supplies power to a load.
Preferably, the first DC-DC converter has the property of input and output isolation, and has a voltage signal comparison link for comparing the output voltage with the input voltage so that the input voltage is the same as the output voltage;
preferably, the first capacitance and the second capacitance are consistent in parameters;
as an equivalent scheme of the above technical scheme, the other connection relationship between the first DC-DC converter and the output DC-DC converter is:
the input of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the second capacitor; the output of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the first capacitor; the input of the output DC-DC converter is positively connected with the positive end of the first capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the first capacitor, and the output of the output DC-DC converter supplies power to a load.
As an extension of the above technical solution, a third capacitor and a second DC-DC converter are added on the basis of the above technical solution, and the connection relationship is as follows:
the input positive electrode is connected with the positive end of the first capacitor, the negative end of the first capacitor is connected with the positive end of the second capacitor, the negative end of the second capacitor is connected with the positive end of the third capacitor, and the negative end of the third capacitor is connected with the input negative electrode;
the input of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the first capacitor; the output of the first DC-DC converter is positively connected with the positive end of the third capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the third capacitor;
the input of the second DC-DC converter is positively connected with the positive end of the second capacitor, and the input of the second DC-DC converter is negatively connected with the negative end of the second capacitor; the output of the second DC-DC converter is positively connected with the positive end of the third capacitor, and the output of the second DC-DC converter is negatively connected with the negative end of the third capacitor;
and the input of the output end DC-DC converter is positively connected with the positive end of the third capacitor, the input of the output end DC-DC converter is negatively connected with the negative end of the third capacitor, and the output of the third DC-DC converter supplies power to a load.
As an equivalent scheme to the above technical scheme, another connection relationship is:
the input of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the first capacitor; the output of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the second capacitor;
the input of the second DC-DC converter is positively connected with the positive end of the third capacitor, and the input of the second DC-DC converter is negatively connected with the negative end of the third capacitor; the output of the second DC-DC converter is positively connected with the positive end of the second capacitor, and the output of the second DC-DC converter is negatively connected with the negative end of the second capacitor;
the input of the output DC-DC converter is positively connected with the positive end of the second capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the second capacitor, and the output of the output DC-DC converter supplies power to the load.
As an equivalent scheme to the above technical scheme, the connection relationship may be:
the input of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the second capacitor; the output of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the first capacitor;
the input of the second DC-DC converter is positively connected with the positive end of the third capacitor, and the input of the second DC-DC converter is negatively connected with the negative end of the third capacitor; the output of the second DC-DC converter is positively connected with the positive end of the first capacitor, and the output of the second DC-DC converter is negatively connected with the negative end of the first capacitor;
the input of the output DC-DC converter is positively connected with the positive end of the first capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the first capacitor, and the output of the output DC-DC converter supplies power to a load.
Preferably, the second DC-DC converter has the property of input and output isolation, and has a voltage signal comparison link for comparing the output voltage with the input voltage so that the input voltage is the same as the output voltage;
preferably, the third capacitance is consistent with the first capacitance and the second capacitance parameters.
As a further extension of the above technical solution, based on the above solution, a connection relationship between n capacitors and n-1 DC-DC converters, each having n positive and negative terminals connected in series in order, may be derived:
the high-voltage power supply circuit comprises an output end DC-DC converter, n capacitors with positive and negative ends sequentially connected in series and n-1 DC-DC converters, wherein n capacitors with positive and negative ends sequentially connected in series form a capacitor series circuit, the positive end and the negative end of the capacitor series circuit are respectively connected to an input positive end and an input negative end, the input positive end and the input negative end of a first DC-DC converter are respectively connected to the positive end and the negative end of a first capacitor, the input positive end and the input negative end of a second DC-DC converter are respectively connected to the positive end and the negative end of a second capacitor, and the input positive end and the input negative end of an n-1 DC-DC converter are respectively connected to the positive end and the negative end of an n-1 capacitor; the positive output and the negative output of the first DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, the positive output and the negative output of the second DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, and the positive output and the negative output of the (n-1) th DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor; the input positive and the input negative of the output DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, and the output DC-DC converter outputs power for the load.
n is an integer greater than 3.
The working principle of the invention is briefly described in connection with fig. 1:
in steady state, the output end DC-DC converter for supplying power to the output transmits energy to the load, the voltage of the second capacitor connected with the output end DC-DC converter is lower than that of the first capacitor because the output end DC-DC converter is used for main power transmission, and the energy of the first capacitor is transmitted to the second capacitor until the voltage is equal when the input voltage is higher than the output voltage because the voltage comparison link is arranged in the first DC-DC converter;
compared with the prior art, the invention has the following beneficial effects:
1. the first DC-DC converter, the second DC-DC converter and the nth DC-DC converter are very easy in design and device type selection because the input voltage is converted into the conventional voltage, and even the design of the DC-DC converter at the output end for transmitting the output energy is simplified, and the conventional module can be selected.
2. The design of the DC-DC converter for carrying out capacitor voltage balance is simplified, compared with the detection and comparison of key signals of each module which are introduced by module serialization, the DC-DC converter adopts internal feedback for automatic comparison, and the design is greatly simplified.
Drawings
FIG. 1 is a circuit diagram of a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a second embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a first DC-DC converter according to the present invention;
FIG. 4 is a circuit diagram of a third embodiment of the present invention;
FIG. 5 is a circuit diagram of a fourth embodiment of the present invention;
FIG. 6 is a circuit diagram of a fifth embodiment of the present invention;
fig. 7 is a circuit diagram of a sixth embodiment of the present invention.
Detailed Description
First embodiment
Fig. 1 shows a circuit diagram of a first embodiment, comprising an input positive vin+, an input negative Vin-, a first DC-DC converter, an output DC-DC converter, a first capacitor C1 and a second capacitor C2. The specific connection relation is as follows: the input positive electrode Vin+ is connected with the positive end of the first capacitor C1 and simultaneously connected with the positive electrode input by the first DC-DC converter, the negative end of the first capacitor C1 is connected with the positive end of the second capacitor C2 and simultaneously connected with the negative electrode input by the first DC-DC converter, and the negative end of the second capacitor C2 is connected with the input negative electrode Vin-; the positive electrode of the output of the first DC-DC converter is connected with the positive end of the second capacitor C2, and the negative electrode of the output of the first DC-DC converter is connected with the negative end of the second capacitor C2; the positive electrode of the input of the output DC-DC converter is connected with the positive end of the second capacitor C2, the negative electrode of the input of the output DC-DC converter is connected with the negative end of the second capacitor C2, and the output DC-DC converter outputs power for a load;
for convenience, the first capacitor C1 is simply referred to as a capacitor C1, and the other is the same, for example, the first diode D1 is referred to as a diode D1.
One circuit of the first DC-DC converter is shown in fig. 3, and the connection relationship is: the positive end of the capacitor Cin is connected with the positive electrode of the input power supply, the positive end of the capacitor Cin is simultaneously connected with one end of the resistor R1 and is also connected with the homonymous end of the Lp1 winding in the transformer T1, and the negative end of the capacitor Cin is connected with the negative electrode of the input power supply; the synonym end of the Lp1 winding is connected with the drain electrode of the switching tube Q1, and the source electrode of the switching tube Q1 is connected with the negative end of the capacitor Cin; the other end of the resistor R1 is connected with one end of the resistor R2, and is simultaneously connected with the positive phase input end of the comparator, and the other end of the resistor R2 is connected with the negative end of Cin;
the same-name end of a winding Lp2 of the transformer T1 is connected to the negative end of the Cin, the different-name end is connected with the anode of the diode D1, one end of the capacitor Ca and the capacitor R4 after being connected in parallel is connected with the cathode of the diode D1, the same time is connected with the negative phase input end of the comparator, and the other end of the capacitor Ca and the capacitor R4 after being connected in parallel is connected with the negative end of the capacitor Cin;
the output end of the comparator is connected with the inside of the control IC, and the grid electrode of the switching tube Q1 is connected with the driving end of the control IC;
the drain electrode of the switch tube Q1 is simultaneously connected with the anode of the diode D2, one end of the capacitor Cs and the resistor Rs which are connected in parallel is connected with the cathode of the diode D2, and the other end of the capacitor Cs and the resistor Rs which are connected in parallel is connected with the anode of the Cin;
the homonymous end of an output winding Lp3 of the transformer T1 is connected with the negative end of a capacitor Co, the homonymous end of the Lp3 is connected with the anode of a diode D3, and the positive end of the capacitor Co is connected with the cathode of the diode D3;
the output DC-DC converter is a common voltage converter capable of converting a varying voltage into a desired output voltage. The principle of which is not elucidated here.
The working principle of the embodiment is as follows:
when an input voltage vin+ is applied to a circuit in which C1 and C2 are connected in series, C1 and C2 produce voltages, and the C1 and C2 parameters are equal. Because of the voltage division of the capacitor, C1 and C2 each divide by half the voltage of Vin. When the C2 has enough voltage, the output end DC-DC converter connected with the C2 in parallel starts to work, establishes output voltage and supplies power to the load; when the output DC-DC converter works, energy is continuously transmitted to a load, the voltage of C2 is inevitably reduced, the voltage source supplies equal current to the capacitors C1 and C2 because the C1 and C2 are connected to the two ends of the voltage in series, the voltage of C1 is inevitably increased, after the comparator in the first DC-DC converter detects the voltage difference of the capacitors C1 and C2, a signal difference signal is provided for a control IC, the control IC controls a switching tube Q1 according to the voltage difference signal, energy on the capacitor of C1 is transmitted to C2, and finally the voltage of the capacitors C1 and C2 is balanced;
the voltage of the non-inverting terminal of the comparator in the first DC-DC converter is obtained by the voltage dividing resistors R1 and R3, the voltage is a certain proportion of the voltage of the input capacitor Cin, and the voltage of the non-inverting terminal is a certain proportion of the voltage of the C1 because the input of the first DC-DC converter is connected with the C1, and the voltage sampling principle of the inverting terminal is as follows: when the switching tube Q1 is turned off, the energy stored in the magnetic core through the winding Lp1 is transmitted to the output capacitor Co through the secondary winding Lp3, and the capacitor Co is actually connected with the capacitor C2, so that the voltage of the capacitor Co is the voltage of the capacitor C2, and since the winding Lp3 is tightly coupled with the winding Lp2, the winding Lp2 also induces a certain voltage, and the voltage induced by the winding Lp2 is easily determined according to the turn ratio of the transformer, therefore, by adjusting the ratio of R1 to R3 to the turn ratio of the winding Lp3 to the winding ratio of the winding Lp2, the comparator can provide an effective signal to the control IC, and finally the voltage balance between the winding C1 and the winding C2 is achieved.
The advantages of the invention are obvious:
1. the DC-DC converter is very easy in design and device type selection due to the fact that the input voltage is converted into the conventional input voltage, and therefore cost is effectively reduced.
2. Compared with the detection and comparison of key signals of each module, which is introduced by the series connection of the modules, the DC-DC converter for capacitor voltage balance is simplified in design and can be produced in a modularized manner.
3. For higher input voltages, the power requirements of a single capacitive balancing module are further reduced because the capacitively balanced DC-DC module outputs are connected in parallel.
Second embodiment
Fig. 2 is a circuit diagram of a second example, which is different from the first embodiment in that the input positive electrode of the output DC-DC converter is connected to the positive electrode of the capacitor C1, the input negative electrode of the output DC-DC converter is connected to the negative electrode of the capacitor C1, and simultaneously connected to the positive electrode of the capacitor C2, and the negative electrode of the capacitor C2 is connected to the input negative electrode; the input positive electrode of the first DC-DC converter is connected with the positive end of the capacitor C2, and the input negative electrode of the first DC-DC converter is connected with the negative end of the second capacitor; the output positive of the first DC-DC converter is connected with the positive end of the capacitor C1, and the output negative electrode of the first DC-DC converter is connected with the negative end of the capacitor C1.
The working principle is the same as that of the first embodiment and is not described herein.
Third embodiment
Fig. 4 is a circuit diagram of a third example, which is different from the first embodiment in that a second DC-DC converter and a capacitor C3 are added, and the connection relationship thereof is as follows: the input positive electrode is connected with the positive end of a capacitor C1, and is simultaneously connected with the input positive electrode of a first DC-DC converter, the negative end of the capacitor C1 is connected with the positive end of a capacitor C2, and is simultaneously connected with the input negative electrode of the first DC-DC converter, the negative end of the capacitor C2 is connected with the positive end of a capacitor C3, and the negative end of the capacitor C3 is connected with the input negative electrode; the input positive electrode of the second DC-DC converter is connected with the positive end of the capacitor C2, and the input negative electrode of the second DC-DC converter is connected with the negative end of the capacitor C2; the positive output electrode of the first DC-DC converter and the positive output electrode of the second DC-DC converter are respectively connected with the positive end of the capacitor C3, the negative output electrode of the first DC-DC converter and the negative output electrode of the second DC-DC converter are connected with the negative end of the capacitor C3; the input positive electrode of the output end DC-DC converter is connected with the positive end of the capacitor C3, the output negative electrode of the output end DC-DC converter is connected with the negative end of the capacitor C3, and the converter DC3 supplies power for output;
the working principle is the same as that of the first embodiment, and the voltage balance of the two ends of C1 and C3 and the voltage balance of the two ends of C2 and C3 are respectively realized.
Fourth embodiment
Fig. 5 is a circuit diagram of a fourth example, which is different from the third embodiment: the input positive electrode and the input negative electrode of the output DC-DC converter are respectively connected with the positive end and the negative end of the capacitor C2; the positive electrode and the negative electrode of the first DC-DC converter are respectively connected with the positive end and the negative end of the capacitor C1, the positive electrode and the negative electrode of the second DC-DC converter are respectively connected with the positive end and the negative end of the capacitor C3, and the positive electrode and the negative electrode of the first DC-DC converter and the second DC-DC output are respectively connected with the positive end and the negative end of the capacitor C2;
the capacitors C1, C2 and C3 are sequentially connected in series, the positive electrode of the input is connected with the positive end of the capacitor C1, and the negative electrode of the input is connected with the negative end of the capacitor C3;
the working principle is the same as that of the third embodiment, and will not be described again here.
Fifth embodiment
Fig. 6 is a circuit diagram of a fifth example, which is different from the third embodiment: the input positive electrode and the input negative electrode of the output DC-DC converter are respectively connected with the positive end and the negative end of the capacitor C1; the positive electrode and the negative electrode of the input of the first DC-DC converter are respectively connected with the positive end and the negative end of the capacitor C2, the positive electrode and the negative electrode of the second DC-DC converter are respectively connected with the positive end and the negative end of the capacitor C3, and the positive electrode and the negative electrode of the output of the first DC-DC converter and the second DC-DC converter are connected to the positive end and the negative end of the capacitor C1;
the capacitors C1, C2 and C3 are sequentially connected in series, the positive electrode of the input is connected with the positive end of the capacitor C1, and the negative electrode of the input is connected with the negative end of the capacitor C3.
The working principle is the same as that of the third embodiment, and will not be described in detail here.
Sixth embodiment
Fig. 7 is a circuit diagram of a sixth embodiment, as a further extension of the present invention, the high-voltage power supply circuit according to this embodiment includes an output DC-DC converter, n capacitors with positive and negative ends sequentially connected in series, and n-1 DC-DC converters with positive and negative ends sequentially connected in series to form a capacitor series circuit, the positive and negative ends of the capacitor series circuit being connected to an input positive and an input negative, respectively, the input positive and the input negative of the first DC-DC converter being connected to the positive and negative ends of the first capacitor, respectively, the input positive and the input negative of the second DC-DC converter being connected to the positive and negative ends of the second capacitor, respectively, the input positive and the input negative of the n-1 DC-DC converter being connected to the positive and negative ends of the n-1 capacitor, respectively; the positive output and the negative output of the first DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, the positive output and the negative output of the second DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, and the positive output and the negative output of the (n-1) th DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor; the input positive and the input negative of the output DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, and the output DC-DC converter outputs power for the load.
n is an integer greater than 3.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be construed as limiting the present invention, and that it will be apparent to those skilled in the art that several modifications and adaptations of the capacitive balance converter can be made without departing from the spirit and scope of the present invention, such as changing the capacitive balance converter to a forward mode or other modes; such modifications and variations are also considered a limitation of the present invention, which is not to be repeated herein, and the scope of the invention is defined by the appended claims.

Claims (8)

1. A high voltage power supply circuit, characterized by: the device comprises an input positive electrode, an input negative electrode, a first capacitor, a second capacitor, a first DC-DC converter and an output DC-DC converter;
the input positive electrode is connected with the positive end of the first capacitor, the negative end of the first capacitor is connected with the positive end of the second capacitor, and the negative end of the second capacitor is connected with the input negative electrode;
the input of the first DC-DC converter is positively connected with the positive end of the first capacitor, the input of the first DC-DC converter is negatively connected with the negative end of the first capacitor, the output of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the second capacitor;
the input of the output DC-DC converter is positively connected with the positive end of the second capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the second capacitor, and the output of the output DC-DC converter supplies power to a load.
2. A high voltage power supply circuit according to claim 1, characterized in that: the input of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the second capacitor; the output of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the first capacitor; the input of the output DC-DC converter is positively connected with the positive end of the first capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the first capacitor, and the output of the output DC-DC converter supplies power to a load.
3. A high voltage power supply circuit according to claim 1 or 2, characterized in that: the first DC-DC converter has the property of input and output isolation, and simultaneously has a voltage signal comparison link for comparing the output voltage with the input voltage so that the input voltage is the same as the output voltage in size;
the first capacitance and the second capacitance are the same.
4. A high voltage power supply circuit according to claim 3, wherein: the input positive electrode is connected with the positive end of the first capacitor, the negative end of the first capacitor is connected with the positive end of the second capacitor, the negative end of the second capacitor is connected with the positive end of the third capacitor, and the negative end of the third capacitor is connected with the input negative electrode;
the input of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the first capacitor; the output of the first DC-DC converter is positively connected with the positive end of the third capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the third capacitor;
the input of the second DC-DC converter is positively connected with the positive end of the second capacitor, and the input of the second DC-DC converter is negatively connected with the negative end of the second capacitor; the output of the second DC-DC converter is positively connected with the positive end of the third capacitor, and the output of the second DC-DC converter is negatively connected with the negative end of the third capacitor;
and the input of the output end DC-DC converter is positively connected with the positive end of the third capacitor, the input of the output end DC-DC converter is negatively connected with the negative end of the third capacitor, and the output of the third DC-DC converter supplies power to a load.
5. The high voltage power supply circuit of claim 4, wherein:
the input of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the first capacitor; the output of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the second capacitor;
the input of the second DC-DC converter is positively connected with the positive end of the third capacitor, and the input of the second DC-DC converter is negatively connected with the negative end of the third capacitor; the output of the second DC-DC converter is positively connected with the positive end of the second capacitor, and the output of the second DC-DC converter is negatively connected with the negative end of the second capacitor;
the input of the output DC-DC converter is positively connected with the positive end of the second capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the second capacitor, and the output of the output DC-DC converter supplies power to the load.
6. The high voltage power supply circuit of claim 5, wherein:
the input of the first DC-DC converter is positively connected with the positive end of the second capacitor, and the input of the first DC-DC converter is negatively connected with the negative end of the second capacitor; the output of the first DC-DC converter is positively connected with the positive end of the first capacitor, and the output of the first DC-DC converter is negatively connected with the negative end of the first capacitor;
the input of the second DC-DC converter is positively connected with the positive end of the third capacitor, and the input of the second DC-DC converter is negatively connected with the negative end of the third capacitor; the output of the second DC-DC converter is positively connected with the positive end of the first capacitor, and the output of the second DC-DC converter is negatively connected with the negative end of the first capacitor;
the input of the output DC-DC converter is positively connected with the positive end of the first capacitor, the input of the output DC-DC converter is negatively connected with the negative end of the first capacitor, and the output of the output DC-DC converter supplies power to a load.
7. A high voltage power supply circuit according to claim 4 or 5 or 6, characterized in that: the second DC-DC converter has the property of input and output isolation, and simultaneously has a voltage signal comparison link for comparing the output voltage with the input voltage so that the input voltage is the same as the output voltage in size;
the third capacitance is the same as the first capacitance and the second capacitance.
8. The high voltage power supply circuit of claim 7, wherein: the Direct Current (DC) -to-DC converter comprises n capacitors and n-1 DC-DC converters, wherein positive ends and negative ends of the n capacitors are sequentially connected in series to form a capacitor series circuit, the positive ends and negative ends of the capacitor series circuit are respectively connected to an input positive electrode and an input negative electrode, the input positive and negative ends of a first DC-DC converter are respectively connected to the positive ends and negative ends of a first capacitor, the input positive and negative ends of a second DC-DC converter are respectively connected to the positive ends and negative ends of a second capacitor, and the input positive and negative ends of the n-1 DC-DC converter are respectively connected to the positive ends and negative ends of the n-1 capacitor; the positive output and the negative output of the first DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, the positive output and the negative output of the second DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, and the positive output and the negative output of the (n-1) th DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor; the input positive end and the input negative end of the output end DC-DC converter are respectively connected to the positive end and the negative end of the nth capacitor, and the output end DC-DC converter outputs power for a load;
n is an integer greater than 3.
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