Conversion module, driving circuit and converter

Abstract

The invention relates to a conversion module, a driving circuit and a converter. The conversion module comprises a low-voltage side, a high-voltage side, a switching tube, an inductor and a capacitor. The number of the switching tubes is four, and the switching tubes are # imgabs 0 #, # imgabs 1 #, # imgabs 2 # and # imgabs 3 #; the voltage of the low-voltage side is # imgabs4 #; the voltage of the high-voltage side is # imgabs5 #; the number of the capacitors is two, and the capacitors are # imgabs 6 # and # imgabs 7 #; the number of the inductors is two, the inductors are # imgabs 8 # and # imgabs 9 #, the inductance value of the # imgabs 10 # is # imgabs 11 #, and the inductance value of the # imgabs 12 # is # imgabs 13 #; the positive electrode of the low-voltage side is connected with the first end of the # imgabs 14 #, the positive electrode of the # imgabs 15 # and the first end of the # imgabs 16 #, and the second end of the # imgabs 17 # is connected with the first end of the # imgabs 18 # and the first end of the # imgabs 19 #; the negative electrode of the low-voltage side is connected with the negative electrode of the # imgabs 20 #, the first end of the # imgabs 21 # and the second end of the # imgabs 22 #, and the second end of the # imgabs 23 # is connected with the second end of the # imgabs 24 # and the first end of the # imgabs 25 #; the positive electrode of the high-voltage side is respectively connected with the second end of the # imgabs 26 # and the positive electrode of the # imgabs 27 #; and the negative electrode of the high-voltage side is respectively connected with the second end of the # imgabs 28 # and the negative electrode of the # imgabs 29 #. By adopting the structure that one inductor corresponds to one capacitor, the high-voltage-resistant requirements of the capacitors and the switching tubes can be relieved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power conversion, and in particular to a conversion module, a drive circuit and a converter. Background Art

[0002] Household storage inverters are mostly used in conjunction with photovoltaics to store photovoltaic electricity or city electricity (during low-peak electricity consumption periods) in batteries. When the city power outage occurs or during peak electricity consumption periods, the DC power stored in the battery is converted into 220-volt AC power for household appliances, thereby playing a role in power transfer, electricity fee management, and emergency power supply.

[0003] There are two types of battery modules connected to household storage inverters: high-voltage batteries and low-voltage batteries. Household storage inverters for high-voltage batteries mostly use Buck / Boost bidirectional converters as battery interfaces. This architecture has a small number of power devices, a simple structure, simple control, and high efficiency. However, the price of high-voltage batteries is higher than that of low-voltage batteries at the same capacity, and the battery voltage level is high, so the safety factor is low.

[0004] Compared with high-voltage batteries (100V-200V), low-voltage batteries (48V) have a lower voltage level, a higher safety factor, and a lower cost at the same capacity. However, the battery interface of the household storage inverter needs to have a strong boost capability to achieve voltage matching between the low-voltage battery and the high-voltage DC bus. Household storage inverters for low-voltage batteries generally use an isolated bidirectional bridge topology as the battery interface. The isolated bridge topology can easily achieve high-gain conversion by adjusting the primary-secondary turns ratio of the high-frequency transformer, and can achieve zero voltage (ZVS) soft switching of the power tube under most operating conditions. However, it uses a high-frequency transformer and more power devices, which has a large volume, cost and loss, and is difficult to improve efficiency. The control is relatively complex, and the existing technology has certain high-voltage resistance requirements for high-voltage side capacitors and switch tubes, resulting in increased costs.

[0005] Therefore, there is a need for a conversion module, drive circuit and converter that has a small requirement for the number of power devices, a small overall size, a low manufacturing cost, a high conversion efficiency and simple control, while being able to alleviate the high voltage resistance requirements of capacitors and switching tubes and reduce costs. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a conversion module, a drive circuit and a converter.

[0007] The technical solution of the present invention is as follows: A conversion module includes a low voltage side, a high voltage side, a switch tube, an inductor and a capacitor; There are four switch tubes, namely switch tube , switch tube , switch tube , switch tube ; The voltage on the low voltage side is ; The voltage on the high voltage side is ; There are two capacitors, namely capacitor and capacitor ; There are two inductors, namely, and inductance , the inductor The inductance is , the inductor The inductance is ; The positive electrodes of the low voltage side are respectively connected to the inductors The first end of the capacitor The positive electrode of the switch tube The first end of the inductor The second ends of the switch tubes are connected to The first end of the switch tube The first end of The negative electrode of the low voltage side is respectively connected to the capacitor The negative electrode of the inductor The first end of the switch tube The second end of the inductor The second end of the switch tube is connected to The second end of the switch tube The first end of The positive electrodes of the high voltage side are connected to the switch tubes The second end of the capacitor The positive electrode; The negative electrodes of the high voltage side are connected to the switch tubes The second end of the capacitor of the negative electrode.

[0008] As a further improvement of the present invention, when the switch tube and the switch tube The switch is turned on. and the switch tube When turned off, the inductor and the inductor To capacitor and capacitor To discharge, the inductor current and The rates of change are: .

[0009] As a further improvement of the present invention, when the switch tube and the switch tube The switch is turned on. and the switch tube When turned off, the inductor current and The rates of change are: .

[0010] As a further improvement of the present invention, when the switch tube and the switch tube The switch is turned on. and the switch tube When turned off, the inductor current and The rates of change are: .

[0011] As a further improvement of the present invention, the low voltage side parallel capacitor .

[0012] As a further improvement of the present invention, the switch tube With the switch tube Complementary conduction, the switch tube With the switch tube Complementary conduction, the switch tube With the switch tube The driving signals are 180° apart.

[0013] As a further improvement of the present invention, the switch tube With the switch tube The duty cycle is equal, duty cycle D>0.5.

[0014] As a further improvement of the present invention, the low-voltage side includes a plurality of battery cells connected in series and an analog front-end chip.

[0015] A driving circuit comprises the above-mentioned conversion module, a first half-bridge driver, and a second half-bridge driver, wherein the first half-bridge driver and the second half-bridge driver control the switch tube The switch tube The switch tube And the switch tube The on and off.

[0016] A converter comprises a plurality of the above-mentioned drive circuits, wherein the plurality of the drive circuits are connected in parallel.

[0017] According to the present invention of the above scheme, the beneficial effects of the present invention are: 1. The present invention calculates the high and low voltage side voltages by sampling, and the inductor current (power) automatically adjusts the switching frequency to achieve ZVS soft switching within the full power range; 2. The present invention uses a transformerless design, which reduces the transformer magnetic coupling loss. Compared with the isolated high-gain converter, the conversion efficiency is increased by about 2%. Each conversion module contains only 4 switching tubes, which requires a small number of power devices and has a low manufacturing cost. 3. The present invention can use large-capacity batteries such as 280Ah and 314Ah. Under the condition that the battery pack has the same kilowatt-hour, large-capacity batteries have a greater cost advantage, while reducing the number of analog front-end chips and the communication burden of the MCU; 4. Inductance in the topology of the present invention and inductance Automatic current sharing, only one current sensor is needed to complete the inductor current sampling, and the control method is simple; 5. The present invention uses fixed duty cycle (fixed gain) control, and the charging and discharging power is controlled by an external charging and discharging device, which retains the battery characteristics of the battery pack port, has simple control, and fast output response speed; 6. The present invention has a current closed-loop control, which can limit the current output when there is an external short circuit or current overload to prevent damage to the battery pack; 7. The present invention adopts a structure in which one inductor corresponds to one capacitor, which can alleviate the high voltage resistance requirements of the capacitor and the switch tube and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the main circuit topology of the conversion module of the present invention; Figure 2 It is a structural schematic diagram of the transformation module of the present invention; Figure 3 is an equivalent circuit diagram of the first mode of the conversion module of the present invention; Figure 4 is an equivalent circuit diagram of the second mode of the conversion module of the present invention; Figure 5 is the equivalent circuit diagram of the third mode of the conversion module of the present invention; Figure 6 is an equivalent circuit diagram of mode 4 of the conversion module of the present invention; Figure 7 is the equivalent circuit diagram of the fifth mode of the conversion module of the present invention; Figure 8 is an equivalent circuit diagram of mode six of the conversion module of the present invention; Fig. 9 is the equivalent circuit diagram of the seventh mode of the conversion module of the present invention; Fig.10 is an equivalent circuit diagram of the eighth mode of the conversion module of the present invention; Fig.11 It is the main waveform diagram of each mode of the present invention; Fig.12 is an average current equivalent circuit diagram of the conversion module of the present invention; Fig.13 It is a structural schematic diagram of the modulation strategy of the conversion module of the present invention; Fig.14 This is a simulation waveform diagram of the present invention when fully loaded in the Boost mode; Fig.15 This is a voltage waveform diagram when fully loaded in the Boost mode of the present invention; Fig.16 It is the efficiency curve diagram of the full power section of the 1.7kw prototype of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships described in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] See also Figure 1 and Figure 2, the present invention provides a conversion module, including a low voltage side, a high voltage side, a switch tube, an inductor and a capacitor; There are 4 switch tubes, namely switch tube , switch tube , switch tube , switch tube , preferably, the switch tube With switch tube Complementary conduction, switch tube With switch tube Complementary conduction, switch tube With switch tube The driving signals of the switch tube are 180° apart. With switch tube The duty cycle is equal, the duty cycle D>0.5; The low voltage side is a battery, including a plurality of cells connected in series and an analog front-end chip. Preferably, there are 16 cells connected in series, and the voltage is , rated voltage is 51.2V, current is ; The high voltage side is the DC bus, and the voltage is , the current is ; There are two capacitors, namely capacitor and capacitor ,capacitance The voltage across the two ends is ,capacitance The voltage across the two ends is ; Low voltage side parallel capacitor , Capacitor Used for filtering; There are two inductors, namely inductor and inductance ,inductance The inductance is ,inductance The inductance is ; The positive pole of the low voltage side is connected to the inductor The first end of the capacitor The positive electrode and switch tube The first end of the inductor The second ends of the switch tubes are connected The first end of the switch tube The first end of The negative pole of the low voltage side is connected to the capacitor The negative pole, inductor The first end of the switch tube The second end of the inductor The second end of the switch tube The second end of the switch tube The first end of The positive pole of the high voltage side is connected to the switch tube The second end of the capacitor The positive electrode; The negative pole of the high voltage side is connected to the switch tube The second end of the capacitor of the negative electrode.

[0023] When the battery is discharged, the converter module works in Boost mode, and when the DC bus is discharged, the converter module works in Buck mode. and inductance Works in a current bidirectional flow mode; the present invention calculates the high and low voltage sides by sampling, and the inductor current (power) automatically adjusts the switching frequency to achieve ZVS soft switching within the full power range; a transformerless design is used to reduce the transformer magnetic coupling loss, and the conversion efficiency is increased by about 2% compared to the isolated high-gain converter, and each conversion module contains only 4 switch tubes, which requires a small number of power devices and has a low manufacturing cost; the inductor in the topology and inductance Automatic current sharing, only one current sensor is needed to complete the inductor current sampling, and the control method is simple; fixed duty cycle (fixed gain) control is used, and the charging and discharging power is controlled by an external charging and discharging device, which retains the battery characteristics of the battery pack port, simple control, and fast output response speed; with current closed-loop control, it can limit the current output in the event of an external short circuit or current overload to prevent damage to the battery pack; the structure of one inductor corresponding to one capacitor can alleviate the high voltage resistance requirements of the capacitor and the switch tube and reduce costs.

[0024] As an embodiment of the present invention, for the convenience of analysis, the following assumptions are made: 1. All power devices and filter elements are ideal devices; 2. All capacitors are large enough and their voltage ripples can be ignored. Based on the above assumptions, in Boost mode and Buck mode, the operation of the conversion module in each switching cycle can be divided into 8 modes. Since the working principles of the two modes are similar, the Boost mode will be used as an example for explanation below. Figure 3-11 : Mode 1: See Figure 3 and Fig.11 , the time period is [ - ]: Switching tube before the moment On, switch tube The body diode Conductivity, At this moment, the switch is turned on at zero voltage. , enter mode 1, the inductor current The direction of the switch Flow to inductor , due to the inductance The inductor current flows in both directions. The direction of the inductor current changes. The direction of the inductor changes Flow to switch tube ; Inductor current The direction of the switch Flow to inductor ; Inductor current and To capacitor , During the entire mode 1, the inductor current and The rates of change are: Formula (1); Mode 2: See Figure 4 and Fig.11 , the time period is [ - ]: At this moment, turn off the switch tube , enter mode 2, the inductor current The direction of the inductor Flow to switch tube ; Inductor current The direction of the switch The body diode Flow to inductor ; Inductor current To capacitor Charging and inductor current Capacitor , switch tube Junction capacitance During the entire mode 2, the inductor current and The rates of change are: Formula (2); Mode 3: See Figure 5 Fig.11 , the time period is [ - ]: At this moment, the switch is turned on at zero voltage. , enter mode three, the inductor current The direction of the inductor Flow to switch tube ; Inductor current The direction of the switch Flow to inductor , due to the inductance The inductor current flows in both directions. The direction of the inductor current changes. The direction of the inductor changes Flow to switch tube ; During the entire mode 3, the inductor current and The rate of change is still the same as formula (2).

[0025] Mode 4: See Figure 6 and Fig.11 , the time period is [ - ]: At this moment, turn off the switch tube , enter mode 4, the inductor current The direction of the inductor Flow to switch tube ; Inductor current The direction of the inductor Flow to switch tube The body diode ; Inductor current Remove the switch tube Junction capacitance The charge on the inductor and the inductor current Give the capacitor together , During the entire mode 4, the inductor current and The rate of change is given by formula (1).

[0026] Mode 5: See Figure 7 and Fig.11 , the time period is [ - ]: At this moment, the switch is turned on at zero voltage. , enter mode five, the inductor current The direction of the inductor Flow to switch tube ; Inductor current The direction of the inductor Flow to switch tube , due to the inductance The inductor current flows in both directions. The direction of the inductor current changes. The direction of the switch changes Flow to inductor ; During the entire mode 5, the inductor current and The rate of change is still the same as formula (1).

[0027] Mode 6: See Figure 8 and Fig.11 , the time period is [ - ]: At this moment, turn off the switch tube , enter mode six, the inductor current The direction of the inductor Flow to switch tube The body diode ; Inductor current The direction of the switch Flow to inductor ; Inductor current Remove the switch tube Junction capacitance The charge on the capacitor To charge, the inductor current , To capacitor During the whole mode VI, the inductor current and The rates of change are: Formula (3).

[0028] Mode 7: See Fig. 9 and Fig.11 , the time period is [ - ]: At this moment, the switch is turned on at zero voltage. , enter mode seven, the inductor current The direction of the inductor Flow to switch tube , due to the inductance The inductor current flows in both directions. The direction of the inductor current changes. The direction of the switch changes Flow to inductor ; Inductor current The direction of the switch Flow to inductor ; During the entire mode 7, the inductor current and The rate of change is still the same as formula (3).

[0029] Mode 8: See Fig.13 and Fig.14 , the time period is [ - ]: At this moment, turn off the switch tube , enter mode eight, the inductor current The direction of the switch The body diode Flow to inductor ; Inductor current The direction of the switch Flow to inductor ; Inductor current , Pulling away capacitors , And switch tube Junction capacitance During the entire mode eight, the inductor current and The rate of change is given by formula (1).

[0030] The switching cycle of the conversion module is , according to the inductance , The volt-second balance can be obtained: Formula (4); Simplifying formula (1), we can get the capacitance , The voltage stress is: Formula (5); See also Figure 3 , we can know that: Formula (6); Combining formulas (5) and (6), the voltage gain can be obtained as: Formula (7); According to modal analysis and formula (5), the voltage stress of each power tube can be obtained as: Formula (8); See also Fig.12 The present invention provides an average current equivalent circuit diagram of the conversion module, which is composed of Fig.12 It can be concluded that: Formula (9); Because the switch and , and Complementary conduction, so we can get: Formula (10); Combining formula (9) and (10), we can get: Formula (11); It can be seen that the conversion module has the characteristic of automatic current sharing when D>0.5.

[0031] In Boost mode, the switch , It is a synchronous rectifier tube, so it can naturally meet the zero voltage turn-on condition. Zero voltage turn-on requires a body diode Provides current conditions, by Fig.10 Obviously, this requires At this moment, the inductor current Pulling away junction capacitance The charge, that is: Formula (12); is the inductor current The current valley value will Substituting into formula (12), we get: Formula (13); in, is the inductor current The amount of change, is the current margin, The smaller it is, the shorter the time required to complete the charging and discharging of the switch tube junction capacitance, and the easier it is to achieve zero-voltage turn-on of the switch tube.

[0032] From formula (1), we can get: ; You can get: Formula (14); in, is the switching frequency, is the time variation; Substituting formula (11) and (14) into formula (13), we can obtain: Formula (15); in , is the output power, and formula (7) can be used to derive ,Will Substituting D into formula (15), we can get the switch The soft switching current condition is: Formula (16); Similarly, the switch tube The soft switching current condition is: Formula (17); Due to the inductance , The inductance is equal, that is = = ， Therefore, the soft switching current condition can be uniformly expressed as: Formula (18); The same conclusion can be obtained in Buck mode.

[0033] The present invention provides a driving circuit, comprising the above-mentioned conversion module, a first half-bridge driver, and a second half-bridge driver, wherein the first half-bridge driver and the second half-bridge driver control the switch tube. , switch tube , switch tube And switch tube Preferably, the first half-bridge driver and the second half-bridge driver are both commonly used half-bridge drivers IR2110, which are simple to control and have low cost.

[0034] See also Fig.13 , the modulation signal With variable frequency triangular carrier , Intersection, respectively , The driving signal, , The driving signal of is inverted, and we get , The driving signal, where the triangular carrier , The phases are 180° apart. In addition, by collecting the low-voltage side voltage , high voltage side voltage , low voltage side current , the current margin feedback value is calculated by formula (18) and with the reference value The error signal is sent to the PI regulator and converted into a triangular carrier wave. , Frequency .

[0035] See Table 1, which gives the design indicators of the transformation module: Table 1 Design indicators of transformation module

[0036] Implemented in Boost mode , ZVS is enabled in Buck mode. , ZVS turn-on, current margin must be small enough to be in the dead zone The charge and discharge of the switch tube junction capacitance is completed within the circuit. However, the switch tube conduction loss, inductor iron loss, and copper loss also increase. .

[0037] Will Substituting into formula (18) and according to the design indicators shown in Table 1, it can be calculated: Formula (19); Desirable .

[0038] In order to verify the feasibility of the proposed transformation module, an experimental prototype was built according to the design indicators in Table 1.

[0039] See also Fig.14 , gives the simulation waveform of full load (1700W) in Boost mode. It can be seen that the duty cycle D≈0.82 and the DC bus voltage ; Inductor current , The average values ​​are basically equal.

[0040] See also Fig.15 , gives the switch tube under full load in Boost mode , , and The gate-source voltage and drain-source voltage waveforms are For switch tube The voltage between the drain and source, For switch tube The voltage between the gate and the source, the other curves correspond to the switching tube , and The voltage of the switch tube , , and The voltage stress is: ; It is basically consistent with the theoretical value. Before the gate-source voltage arrives, the drain-source voltage has dropped to 0, indicating that all switch tubes have achieved soft switching.

[0041] See also Fig.16 , which gives =51.2V, = Experimental efficiency at 400 V. It can be seen that the efficiency is 94%-95% at light load (below 10% rated power), the efficiency is >95% in the full power range above light load, and the peak efficiency is 97.39%, which occurs near 35% rated power.

[0042] The present invention provides a converter, comprising a plurality of the above-mentioned drive circuits, which are staggered in parallel, adopt a single-stage structure, do not contain a high-frequency transformer, and each drive circuit contains only 4 switch tubes and 2 non-isolated bootstrap drive chips, so the number of power devices and the number of required auxiliary power supplies are small, and the cost is low; the voltage stress of the power tube is very low, the voltage gain is high, and the ZVS soft switching of all power tubes can be achieved under full working conditions through frequency conversion control and reasonable inductance design, and a small conduction loss can be maintained, so the conversion efficiency is high.

[0043] In summary, the present invention provides a conversion module, a drive circuit and a converter. The present invention calculates the high and low voltage side voltages by sampling, and the inductor current (power) automatically adjusts the switching frequency to achieve ZVS soft switching within the full power range; a transformerless design is used to reduce the transformer magnetic coupling loss, and the conversion efficiency is increased by about 2% compared with the isolated high-gain converter. Each conversion module contains only 4 switch tubes, which requires a small number of power devices and has a low manufacturing cost; the inductor in the topology and inductance Automatic current sharing, only one current sensor is needed to complete the inductor current sampling, and the control method is simple; fixed duty cycle (fixed gain) control is used, and the charging and discharging power is controlled by an external charging and discharging device, which retains the battery characteristics of the battery pack port, simple control, and fast output response speed; with current closed-loop control, it can limit the current output in the event of an external short circuit or current overload to prevent damage to the battery pack; the structure of one inductor corresponding to one capacitor can alleviate the high voltage resistance requirements of the capacitor and the switch tube and reduce costs.

[0044] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A transformation module, characterized in that: Including low voltage side, high voltage side, switch tube, inductor and capacitor; There are four switch tubes, namely switch tube , switch tube , switch tube , switch tube ; The voltage on the low voltage side is ; The voltage on the high voltage side is ; There are two capacitors, namely capacitor and capacitor ; There are two inductors, namely, and inductance , the inductor The inductance is , the inductor The inductance is ; The positive electrodes of the low voltage side are respectively connected to the inductors The first end of the capacitor The positive electrode of the switch tube The first end of the inductor The second end of the switch tube is connected to The first end of the switch tube The first end of The negative electrode of the low voltage side is connected to the capacitor The negative electrode of the inductor The first end of the switch tube The second end of the inductor The second ends of the switch tubes are connected to The second end of the switch tube The first end of The positive electrodes of the high voltage side are connected to the switch tubes The second end of the capacitor The positive electrode; The negative electrodes of the high voltage side are connected to the switch tubes The second end of the capacitor of the negative electrode.

2. The transformation module according to claim 1, characterized in that: When the switch and the switch tube The switch is turned on. and the switch tube When turned off, the inductor and the inductor To capacitor and capacitor To discharge, the inductor current and The rates of change are: 。 3. The transformation module according to claim 1, characterized in that: When the switch and the switch tube The switch is turned on. and the switch tube When turned off, the inductor current and The rates of change are: 。 4. The transformation module according to claim 1, characterized in that: When the switch and the switch tube The switch is turned on. and the switch tube When turned off, the inductor current and The rates of change are: 。 5. The transformation module according to claim 1, characterized in that: The low voltage side parallel capacitor .

6. The transformation module according to claim 1, characterized in that: The switch tube With the switch tube Complementary conduction, the switch tube With the switch tube Complementary conduction, the switch tube With the switch tube The driving signals are 180° apart.

7. The transformation module according to claim 1, characterized in that: The switch tube With the switch tube The duty cycle is equal, duty cycle D>0.

5.

8. The transformation module according to claim 1, characterized in that: The low-voltage side includes a plurality of battery cells connected in series and an analog front-end chip.

9. A driving circuit, characterized in that: The invention comprises a conversion module as claimed in any one of claims 1 to 8, a first half-bridge driver, and a second half-bridge driver, wherein the first half-bridge driver and the second half-bridge driver control the switch tube The switch tube The switch tube And the switch tube The on and off.

10. A converter, characterized in that: The method comprises a plurality of driving circuits as claimed in claim 9, wherein the plurality of driving circuits are connected in parallel.

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