WO2021017389A1

WO2021017389A1 - Dc-dc loop flow control apparatus and control method, electronic device and medium

Info

Publication number: WO2021017389A1
Application number: PCT/CN2019/128543
Authority: WO
Inventors: 李锐; 李辉; 梁迢
Original assignee: 杭州中恒电气股份有限公司
Priority date: 2019-07-29
Filing date: 2019-12-26
Publication date: 2021-02-04
Also published as: CN110311580A

Abstract

A DC-DC loop flow control method, an electronic device and a medium, relating to the technical field of converters. A DC-DC loop flow control apparatus, comprising a load (R) and at least two converters (1), wherein each converter (1) comprises: a rectification module (11) comprising a rectification unit (111) arranged corresponding to each phase AC source (2); a voltage transformation module (13) connected between the rectification module (11) and a voltage output end; a voltage output end, comprising a positive electrode interface and a negative electrode interface, wherein a positive output end of the rectification module (11) is connected to one end of the load (R) by means of the voltage transformation module (13) and the positive electrode interface; a negative output end of the rectification module (11) is connected to the other end of the load (R) by means of the voltage transformation module (13) and the negative electrode interface; the current flowing through the positive interface is set to i1, and the current flowing through the negative interface is set to i2; and adjustment modules (12), wherein each adjustment module (12) is connected in series to the negative output end in the corresponding rectification unit (111), and by means of current equalization control and the adjustment modules (12), i1 of different converters (1) are enabled to be equal, and i2 of different converters (1) are enabled to be equal.

Description

DCDC circulation control device, control method, electronic equipment and medium

Technical field

The invention relates to the technical field of converters, in particular to a DCDC circulating current control device, a control method, electronic equipment and a medium.

Background technique

If a converter can convert a DC voltage into other DC voltages (for example, converting 3.0V to 1.5V or 5.0V), we call this converter a DCDC converter, or a switching power supply or a switching regulator . Because large-scale equipment often needs large-capacity DC power supply. However, the power capacity of a single power supply component is limited. When a large-capacity power supply is required, a distributed power system is usually used. The distributed power system is a large-capacity power system composed of several small-capacity power modules.

Theoretically speaking, the distributed power system can be composed of series, parallel, and mixed series and parallel. However, in actual applications, the output current of the power supply is usually very high, but the output voltage is not high, so In comparison, the parallel power supply system has been more widely used.

The power modules in the prior art can use non-isolated DCDC converters. Such converters are connected in parallel to form a power supply system. However, when such converters are connected in parallel, there will be circulating currents between the converters, resulting in positive effects on the same converter. The negative currents are not equal, and the heat of each converter is uneven, which can easily cause damage to the converter.

Summary of the invention

In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a DCDC circulating current control device, which makes the i1 of different converters equal and the i2 of different converters equal through the current sharing control and adjustment module, that is, the The sum of i1 and i2 is zero, so that the circulating current between the converters can be reduced, so as to reduce the probability of device damage in the converter.

One of the objectives of the present invention is achieved by adopting the following technical solution: a DCDC circulating current control device, including a load R and at least two converters, each of the converters includes:

The rectifier module is connected to a multi-phase AC source. The rectifier module includes a rectifier unit corresponding to each phase of the AC source. The output terminal of each phase of the AC source is connected to the positive output terminal of the rectifier module through its corresponding rectifier unit. Negative output

A transformer module, which is connected between the rectifier module and the voltage output terminal, and is used to transform the output voltage of the rectifier module and output it to the voltage output terminal;

The voltage output terminal is connected to the output terminal of the transformer module, the voltage output terminal includes a positive interface and a negative interface, and the positive output terminal of the rectifier module is connected to one end of the load R via the transformer module and the positive interface; the rectifier The negative output terminal of the module is connected to the other end of the load R via the transformer module and the negative terminal; the current flowing through the positive terminal is set to i1, and the current flowing through the negative terminal is set to i2;

The adjustment module corresponds to the rectification unit, and each adjustment module is connected in series to the negative output end of the corresponding rectification unit. By performing current sharing control on the converter and adjustment of the adjustment module, the i1 of different converters Equal, i2 of different converters are equal.

Further, each rectifier unit has an input terminal, a positive output terminal and a negative output terminal, the input terminal is connected to a corresponding phase AC source, and the positive output terminal is all coupled to the positive output terminal of the rectifier module,

The adjustment modules all include a switch S0. The switch S0 has a control end, a forward end, and a reverse end. The voltage of the forward end is higher than the voltage of the reverse end. The control ends of the switch S0 are respectively coupled to In the PWM width adjusting device or voltage control device, the positive terminal of the switch tube S0 is respectively coupled to the negative output terminal; the reverse terminal of the switch tube S0 is coupled to the negative output terminal of the rectifier module.

Further, the rectification unit includes a diode D1 and a diode D2, the cathode of the diode D1 is the positive output terminal of the rectification unit, and the anode of the diode D1 is the input terminal of the rectification unit; The cathodes are respectively coupled to the input terminals of the rectifier unit; the anode of the diode D2 is the negative output terminal of the rectifier unit.

Further, the transformation module includes at least one first transformation unit, and the first transformation unit is sequentially connected in series between the rectification module and the voltage output terminal.

Further, the first transformer unit includes an inductor L1, a switch tube S1, a diode D7, and a capacitor C1. The switch tube S1 has a control end, a forward end, and a reverse end. The control end is connected to the PWM width adjustment device, The voltage at the forward end is higher than the voltage at the reverse end,

One end of the inductor L1 is the positive input terminal of the first transformation unit, the other end of the inductor L1 is coupled to the anode of the diode D7, and the cathode of the diode D7 is the positive input of the first transformation unit. Output terminal; the positive terminal of the switch tube S1 is coupled to the anode of the diode D7, the negative input terminal and the negative output terminal of the first transformer unit are both coupled with the reverse terminal of the switch tube S1; the capacitor The two ends of C1 are respectively coupled to the cathode of the diode D7 and the reverse end of the switch S1.

Further, the first transformer unit includes an inductor L3, a switch tube S3, a diode D9, and a capacitor C3. The switch tube S3 has a control terminal, a forward terminal, and a reverse terminal. The control terminal is connected to the PWM width adjustment device, The voltage at the forward end is higher than the voltage at the reverse end,

The forward end of the switch tube S3 is the positive input end of the first transformation unit, the reverse end is coupled to one end of the inductor L3, and the other end of the inductor L3 is the positive output end of the first transformation unit The cathode of the diode D9 is coupled to the reverse end of the switch S3, the negative input end and the negative output end of the first transformer unit are both coupled to the anode of the diode D9, and the two capacitors of the capacitor C3 The terminals are respectively coupled to the anode of the diode D9 and the positive output terminal of the first transformer unit.

Further, the transformation module further includes at least one second transformation unit, and the first transformation unit and the second transformation unit are connected in series between the rectification module and the voltage output terminal,

The second transformer unit includes an inductor L3, a switch S3, a diode D9, and a capacitor C3. The switch S3 has a control end, a forward end, and a reverse end. The control end is connected to the PWM width adjustment device. The voltage is higher than the voltage at the reverse end,

The forward end of the switch tube S3 is the positive input end of the second transformation unit, the reverse end is coupled to one end of the inductor L3, and the other end of the inductor L3 is the positive output end of the second transformation unit The cathode of the diode D9 is coupled to the reverse end of the switch S3, the negative input end and the negative output end of the second transformer unit are both coupled to the anode of the diode D9, and the two capacitors C3 The terminals are respectively coupled to the anode of the diode D9 and the positive output terminal of the second transformer unit.

The second object of the present invention is to provide a DCDC circulating current control method to quickly control the values of i1 and i2 of each converter to be equal, thereby reducing the circulating current between the converters and reducing the probability of device damage in the converter.

The second objective of the present invention is achieved by adopting the following technical solution: a DCDC circulating current control method, using the above-mentioned circulating current control device, which includes:

Get the total number of converters and set it to N;

Get the current passing through the load R and set it to iout;

Obtain current i1 and current i2 of each converter;

It is judged whether the value of each converter current i1 and the value of current i2 are equal to the value of iout divided by N, if not, the value of i1 and i2 is equal to the value of iout divided by N through the current sharing control and adjustment module.

The third object of the present invention is to provide an electronic device that performs the second object of the present invention, which includes a processor, a storage medium, and a computer program. The computer program is stored in the storage medium. When the computer program is executed by the processor, the above DCDC circulation control method.

The fourth object of the present invention is to provide a computer-readable storage medium storing the second object of the present invention, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned DCDC circulation control method is realized.

Compared with the prior art, the present invention has the beneficial effect that: in the DCDC circulating current control device, the i1 of different converters and i2 of different converters are equalized through the current sharing control and adjustment module, that is, the i1 and i2 of the same converter are equal. The sum is zero, so that the circulating current between the converters can be reduced, so as to reduce the probability of device damage in the converter.

Description of the drawings

Figure 1 is a system block diagram of a DCDC circulating current control device according to an embodiment of the present invention;

2 is a circuit diagram of a DCDC circulating current control device according to an embodiment of the present invention;

3 is a circuit diagram of the first transformer unit in the DCDC circulating current control device of the third embodiment of the present invention;

4 is a circuit diagram of the first transformer unit in the DCDC circulating current control device of the fourth embodiment of the present invention;

Figure 5 is a circuit diagram of a transformer module in a DCDC circulating current control device according to the fifth embodiment of the present invention;

6 is a flow chart of a DCDC circulating current control method according to the sixth embodiment of the present invention;

Fig. 7 is a structural block diagram of an electronic device according to the seventh embodiment of the present invention.

In the figure: 1, converter; 11, rectifier module; 111, rectifier unit; 12, regulating module; 13, transformer module; 131, first transformer unit; 132, second transformer unit; 2. multi-phase AC Source; 3. Electronic equipment; 31, processor; 32, memory; 33, input device; 34, output device.

Detailed ways

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. It should be noted that the following description of the present invention with reference to the accompanying drawings is only illustrative and not restrictive. Various embodiments can be combined with each other to form other embodiments not shown in the following description.

Example one

The first embodiment provides a DCDC loop current control device, which can change the magnitude of the current i2, so that the i1 of each converter 1 is equal, and the i2 of each converter 1 is equal, that is, the positive and negative currents of the same converter 1 are realized. The sum is zero to reduce the circulating current between converter 1.

Specifically, referring to FIGS. 1 and 2, a DCDC circulating current control device includes a rectifier module 11, a voltage output terminal, a regulating module 12 and a transformer module 13. The rectifier module 11 includes a plurality of rectifier units 111. The rectifier unit 111 is connected to each phase AC source in a one-to-one correspondence. The rectifier unit 111 includes an input terminal, a positive output terminal, and a negative output terminal. Each input terminal is respectively connected to each phase AC source. The positive output terminal is coupled to the positive output terminal of the rectifier module 11, and the negative output terminal is coupled to At the negative output terminal of the rectifier module 11.

The number of adjustment modules 12 can be set to x, and they are arranged in a one-to-one correspondence with the rectification unit 111, where x is greater than or equal to 2, and each adjustment module 12 is connected in series to the negative output terminal of the corresponding rectification unit 111. The current sharing control and the adjustment of the adjustment module 12 are performed by the voltage adjustment device to make the i1 of different converters 1 equal and the i2 of different converters 1 equal.

The transformer module 13 is connected between the rectifier module 11 and the voltage output terminal. The transformer module 13 receives the DC power output from the rectifier module 11, and then performs DC-DC conversion on the DC power and outputs it from the voltage output terminal.

The voltage output terminal is used to output the transformed voltage. The voltage output terminal includes a positive interface and a negative interface. The positive output terminal of the rectifier module 11 is connected to one end of the load R via the transformation module 13 and the positive interface; the negative terminal of the rectifier module 11 The output end is connected to the other end of the load R via the transformer module 13 and the negative terminal. The external devices can be connected in parallel to the two ends of the load R to realize power supply to the external devices. The current flowing through the positive interface is set to i1, and the current flowing through the negative interface is set to i2.

The voltage output terminals can also be respectively connected to the voltage regulating device, and the current sharing control of i1 in each converter 1 is realized through the voltage regulating device, that is, when each converter 1 is connected in parallel, each converter 1 is realized under the action of the voltage regulating device. Where i1 is equal.

In summary, after the above converters 1 are connected in parallel, when the i1 of each converter 1 is not equal, and the i2 of each converter is not equal, the current sharing control of the voltage regulator and the control of the switch S0 are synchronized to make each converter 1 The i1 of each converter 1 is equal, and the i2 of each converter 1 is equal, so that the sum of the positive and negative currents of the same converter 1 is zero, so as to reduce the circulating current between the converters 1 and improve the service life of the converter 1.

Example two

The second embodiment is carried out on the basis of the first embodiment. Referring to FIG. 1 and FIG. 2, the adjustment module 12 includes a switch tube S0. Among them, the output terminals of the switch tube S0, the rectifier unit 111, and the multi-phase AC source 2 are arranged in one-to-one correspondence. Each of the rectifying units 111 includes a diode D1 and a diode D2.

The cathode of the diode D1 is the positive output terminal of the rectifier unit 111, the positive output terminal of each rectifier unit 111 is coupled to the positive output terminal of the rectifier module 11, and the anode of the diode D1 is the input terminal of the corresponding rectifier unit 111. The output terminals of the source are respectively coupled to the anode of the diode D1; the cathode of the diode D2 is coupled to the anode of the diode D1 in the same rectifying unit 111, and the anode of the diode D2 is the negative output terminal of the rectifying unit 111.

The switch S0 has a control end, a forward end, and a reverse end. The voltage of the forward end is higher than the voltage of the reverse end. The control end of the switch S0 is respectively coupled with a PWM width adjustment device or a voltage control device, through the PWM width adjustment device Adjusting the duty cycle of the switching tube S0 or adjusting the driving voltage of the switching tube S0 through a voltage control device, thereby changing the loop impedance of i2 and changing the size of i2. The switch S0 can be any one of a MOS tube, an IGBT, a GaN, and a triode, and is preferably a depletion N-MOS tube with a parasitic diode.

The positive terminal of the switch tube S0 is respectively coupled to the negative output terminal of the corresponding rectifier unit 111, and the negative terminal is both coupled and connected to the negative input terminal of the rectifier unit 111.

In summary, after connecting the above converters 1 in parallel, the current sharing control of the voltage regulator is used to make the i1 of each converter 1 equal. When the i2 of each converter 1 is not equal, the current sharing control and switching tube S0 can be reused. Make the i1 of each converter 1 equal, and the i2 of each converter 1 equal, so that the sum of the positive and negative currents of the same converter 1 is zero, so as to reduce the circulating current between converters 1 and improve the use of converter 1 life.

Example three

The third embodiment is carried out on the basis of the first or second embodiment. With reference to Figures 1, 2 and 3, the transformer module 13 includes at least one first transformer unit 131, and the first transformer unit 131 is connected in series with Between the rectifier module 11 and the voltage output terminal, one or more stages of DC-DC conversion can be realized.

The first transformer unit 131 includes an inductor L1, a switch S1, a diode D7, and a capacitor C1.

The switch S1 can be any one of MOSFET, IGBT, GaN, and triode, preferably a depletion N-MOSFET. The switch S1 has a control end, a forward end, and a reverse end. The control end is connected to the PWM width adjustment device. The voltage at the forward end is higher than the voltage at the reverse end, that is, the control end, forward end, and reverse end of the switch S1 It can correspond to the gate, drain, and source of a depletion N-MOSFET.

One end of the inductor L1 is the positive input terminal of the first transformation unit 131, the other end of the inductor L1 is coupled to the anode of the diode D7, and the cathode of the diode D7 is the positive output terminal of the first transformation unit 131; The positive terminal is coupled to the anode of the diode D7, the negative input terminal and the negative output terminal of the first transformer unit 131 are both coupled to the reverse terminal of the switch S1; both ends of the capacitor C1 are respectively coupled to the cathode of the diode D7 , The reverse end of switch S1.

When there are multiple first transformation units 131, the first transformation units 131 are connected in series, the cathode of the diode D1 in the rectifier module 11 is all coupled to the positive input end of the first stage first transformation unit 131, and the switch tube S0 The inverted ends of are all coupled to the negative input end of the first-stage first transformation unit 131; the cathode of the diode D7 in the x-th stage first transformation unit 131 is coupled to the anode interface, the x-th stage first transformation unit The reverse end of the switch tube S1 in 131 is coupled to the negative port, thereby realizing multi-level DC-DC conversion.

Example four

The fourth embodiment is performed on the basis of the first or second embodiment. Referring to FIG. 1, FIG. 2 and FIG. 4, the first transformation unit 131 may include an inductor L3, a diode D9, a switch tube S2, and a capacitor C3.

The switch S3 can be any one of MOSFET, IGBT, GaN, and triode, preferably a depletion N-MOSFET. The switch S3 has a control end, a forward end, and a reverse end. The control end is connected to the PWM width adjustment device. The voltage at the forward end is higher than the voltage at the reverse end, that is, the control end, forward end, and reverse end of the switch S1 It can correspond to the gate, drain, and source of a depletion N-MOSFET.

The forward end of the switch S3 is the positive input end of the first transformation unit 131, the reverse end is coupled to one end of the inductor L3, and the other end of the inductor L3 is the positive output end of the first transformation unit 131; The cathode is coupled to the reverse end of the switch tube S3, the negative input terminal and the negative output end of the first transformation unit 131 are coupled to the anode of the diode D9, and both ends of the capacitor C3 are respectively coupled to the anode of the diode D9 and the transformation Positive output terminal of module 13.

When there are a plurality of first transformation units 131 and the first transformation units 131 are connected in series, the cathode of the diode D1 in the rectifier module 11 is all coupled to the positive input end of the first stage first transformation unit 131, and the switch tube The reverse end of S0 is all coupled to the negative input end of the first-stage first transformation unit 131; the end of the inductor L3 in the x-th stage first transformation unit 131 away from the switching tube S3 is coupled to the positive interface, the x-th stage The anode and the cathode of the diode D9 in the first transformer unit 131 are coupled to each other, thereby realizing multi-level DC-DC conversion.

Example five

The fifth embodiment is carried out on the basis of the third embodiment. With reference to 1, Figures 2, 3 and 5, the transformer module 13 also includes at least one second transformer unit 132, the first transformer unit 131, the second transformer The transformer unit 132 is connected in series between the rectifier module 11 and the voltage output terminal. The first transformer unit 131 can refer to the circuit shown in the third embodiment.

Referring to FIG. 5, the second transformer unit 132 may include an inductor L3, a diode D9, a switch tube S2, and a capacitor C3.

The forward end of the switch S3 is the positive input end of the second transformation unit 132, the reverse end is coupled to one end of the inductor L3, and the other end of the inductor L3 is the positive output end of the second transformation unit 132; The cathode is coupled to the reverse end of the switch tube S3, the negative input end and the negative output end of the second transformer unit 132 are coupled to the anode of the diode D9, and both ends of the capacitor C3 are respectively coupled to the anode and the transformer of the diode D9. Positive output terminal of module 13.

The number of the first transformation unit 131 and the second transformation unit 132 can be added according to the actual situation. FIG. 5 shows a case where a first transformation unit 131 and a second transformation unit 132 are connected in series, where the inductor L1 is far away One end of the diode D7 is coupled to the positive output end of the rectifier module 11, the reverse end of the switch S0 is coupled to the reverse end of the switch S1, the cathode of the diode D7 is coupled to the anode of the switch S3, and the inductor L3 is far away One end of the switch tube S3 is coupled to the positive port, and the anode of the diode D9 is coupled to the negative port. Therefore, the rectifier unit 111 transmits the DC voltage from the output end to the transformation module 13 and undergoes the first-stage DC-DC conversion of the first transformation unit 131, and then the second-stage DC-DC transformation of the second transformation unit 132, thereby The transformed voltage is output from the voltage output terminal.

Example Six

The sixth embodiment is to provide a circulating current control method, referring to FIG. 2 and FIG. 6, which can use the above-mentioned circulating current control device to quickly adjust the current value of each i1 and i2.

The circulation control method includes the following steps:

Step S1: Obtain the total number of converters 1 and set it to N, where N is greater than or equal to 2.

Step S2. Obtain the current passing through the load R, set the current as iout, and after each converter 1 is connected in parallel, the sum of the values of i1 of N converters 1 after being added is equal to the value of iout, and N converters 1 The sum of the values of i2 after addition is also equal to the value of iout.

Step S3: Obtain the current i1 of the positive interface and the current i2 of the negative interface in each converter 1. Both i1 and i2 can be obtained through detection equipment such as transformers, ammeters, oscilloscopes, and various sampling circuits built.

Step S4: Determine whether the value of the current i1 and the value of the current i2 of each converter 1 are equal to the value of iout divided by N (∣iout/N∣).

If not, then synchronously control the voltage regulator and each switch S0 so that the values of i1 and i2 of each converter 1 are equal to the value of iout divided by N (∣iout/N∣).

That is, when ∣i2∣>∣iout/N∣, the PWM width adjustment device or voltage control device of the switch tube S0 can be used to reduce the value of i2; that is, when ∣i2∣<∣iout/N∣, The PWM width adjustment device or voltage control device of the switch tube S0 can be used to increase the value of corresponding i2; when ∣i1∣>∣iout/N∣, the output voltage of the converter 1 can be changed by the voltage adjustment device, So that ∣i1∣ is reduced; when ∣i1∣<∣iout/N∣, the output voltage of the transformer 1 can be changed by the voltage regulator, thereby increasing ∣i1∣.

Step S5: End the operation.

Through this circulating current control method, we can finally get ∣i1∣=∣i2∣=∣iout/N∣ for the same converter 1, and the values of i1 and i2 between each converter 1 are equal, so that converter 1 is connected in parallel After that, the positive and negative currents of the same converter 1 are equal, and there is no circulating current between the converters 1, so as to reduce the probability of uneven heating of the converter 1, thereby increasing the service life of the converter 1.

Example Seven

FIG. 7 is a schematic structural diagram of an electronic device provided by Embodiment 7 of the present invention. As shown in FIG. 7, the electronic device 3 includes a processor 31, a memory 32, an input device 33, and an output device 34; the processor 31 in the computer device The number can be one or more. In FIG. 7, one processor 31 is taken as an example; the processor 31, the memory 32, the input device 33, and the output device 34 in the electronic device 3 may be connected by a bus or other means, as shown in FIG. Take the bus connection as an example.

As a computer-readable storage medium, the memory 32 can be used to store software programs, computer-executable programs, and modules, such as the DCDC circulation control method in the embodiment of the present invention. The processor 31 executes various functional applications and data processing of the electronic device 3 by running the software programs, instructions, and modules stored in the memory 32, that is, realizes the DCDC circulation control method of the sixth embodiment.

The memory 32 may mainly include a program storage area and a data storage area. The program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal. In addition, the memory 32 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some examples, the memory 32 may further include a memory remotely provided with respect to the processor 31, and these remote memories may be connected to the electronic device 3 through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 33 is connected with the corresponding detection equipment and is used to receive corresponding data; the output device 34 outputs corresponding instructions, and the switch tube S0 executes corresponding instructions corresponding to the PWM width adjustment device, the voltage control device, and the voltage adjustment device.

Example eight

The eighth embodiment of the present invention also provides a computer-readable storage medium, which contains computer-executable instructions, and the computer-executable instructions are used to execute the above-mentioned DCDC circulation control method when executed by a computer processor, and the method includes:

Get the total number of converter 1 and set it to N;

Get the current passing through the load R and set it to iout;

Obtain current i1 and current i2 of each converter 1;

Determine whether the value of current i1 and current i2 of each converter 1 is equal to the value of iout divided by N. If not, the value of i1 and i2 is equal to the value of iout divided by N through the current sharing control and adjustment module 12 Numerical value.

Of course, for a computer-readable storage medium provided by an embodiment of the present invention, the computer-executable instructions thereof are not limited to the above method operations.

Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by software and necessary general-purpose hardware, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. . Based on this understanding, the technical solution of the present invention essentially or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk. , Read-Only Memory (ROM), Random Access Memory (Random Access Memory, RAM), Flash memory (FLASH), hard disk or optical disk, etc., including several instructions to make an electronic device (can be a mobile phone, personal computer, A server, or a network device, etc.) execute the method of each embodiment of the present invention.

The foregoing embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the present invention. The scope of protection required.

Claims

A DCDC circulating current control device, characterized in that it includes a load R and at least two converters, each of which includes:

The rectifier module is connected to a multi-phase AC source. The rectifier module includes a rectifier unit corresponding to each phase of the AC source. The output terminal of each phase of the AC source is connected to the positive output terminal of the rectifier module through its corresponding rectifier unit. Negative output

A transformer module, which is connected between the rectifier module and the voltage output terminal, and is used to transform the output voltage of the rectifier module and output it to the voltage output terminal;

The voltage output terminal is connected to the output terminal of the transformer module, the voltage output terminal includes a positive interface and a negative interface, and the positive output terminal of the rectifier module is connected to one end of the load R via the transformer module and the positive interface; the rectifier The negative output terminal of the module is connected to the other end of the load R via the transformer module and the negative terminal; the current flowing through the positive terminal is set to i1, and the current flowing through the negative terminal is set to i2;

The adjustment module corresponds to the rectification unit, and each adjustment module is connected in series to the negative output end of the corresponding rectification unit. By performing current sharing control on the converter and adjustment of the adjustment module, the i1 of different converters Equal, i2 of different converters are equal.
The DCDC circulating current control device according to claim 1, wherein each rectifier unit has an input terminal, a positive output terminal, and a negative output terminal, the input terminal is connected to a corresponding phase AC source, and the positive The output terminals are all coupled to the positive output end of the rectifier module,

The adjustment modules all include a switch S0. The switch S0 has a control end, a forward end, and a reverse end. The voltage of the forward end is higher than the voltage of the reverse end. The control ends of the switch S0 are respectively coupled to In the PWM width adjusting device or voltage control device, the positive terminal of the switch tube S0 is respectively coupled to the negative output terminal; the reverse terminal of the switch tube S0 is coupled to the negative output terminal of the rectifier module.
The DCDC circulating current control device according to claim 2, wherein the rectifier unit includes a diode D1 and a diode D2, the cathode of the diode D1 is the positive output terminal of the rectifier unit, and the diode D1 The anode is the input terminal of the rectifier unit; the cathode of the diode D2 is respectively coupled to the input terminal of the rectifier unit; the anode of the diode D2 is the negative output terminal of the rectifier unit.
The DCDC circulating current control device according to any one of claims 1 to 3, wherein the transformation module includes at least one first transformation unit, and the first transformation unit is connected in series to the rectifier in sequence. Between the module and the voltage output terminal.
The DCDC circulating current control device according to claim 4, wherein the first transformation unit includes an inductor L1, a switch tube S1, a diode D7, and a capacitor C1, and the switch tube S1 has a control terminal, a forward direction The control terminal is connected to the PWM width adjustment device, and the voltage at the forward terminal is higher than the voltage at the reverse terminal.

One end of the inductor L1 is the positive input terminal of the first transformation unit, the other end of the inductor L1 is coupled to the anode of the diode D7, and the cathode of the diode D7 is the positive input of the first transformation unit. Output terminal; the positive terminal of the switch tube S1 is coupled to the anode of the diode D7, the negative input terminal and the negative output terminal of the first transformer unit are both coupled with the reverse terminal of the switch tube S1; the capacitor The two ends of C1 are respectively coupled to the cathode of the diode D7 and the reverse end of the switch S1.
A DCDC circulating current control device according to claim 4, characterized in that,

The first transformation unit includes an inductor L3, a switch S3, a diode D9, and a capacitor C3. The switch S3 has a control end, a forward end, and a reverse end. The control end is connected to the PWM width adjustment device. The voltage is higher than the voltage at the reverse end,

The forward end of the switch tube S3 is the positive input end of the first transformation unit, the reverse end is coupled to one end of the inductor L3, and the other end of the inductor L3 is the positive output end of the first transformation unit The cathode of the diode D9 is coupled to the reverse end of the switch S3, the negative input end and the negative output end of the first transformer unit are both coupled to the anode of the diode D9, and the two capacitors of the capacitor C3 The terminals are respectively coupled to the anode of the diode D9 and the positive output terminal of the first transformer unit.
The DCDC circulating current control device according to claim 5, wherein the transformation module further comprises at least one second transformation unit, and the first transformation unit and the second transformation unit are connected in series with the Between the rectifier module and the voltage output terminal,

The second transformer unit includes an inductor L3, a switch S3, a diode D9, and a capacitor C3. The switch S3 has a control end, a forward end, and a reverse end. The control end is connected to the PWM width adjustment device. The voltage is higher than the voltage at the reverse end,

The forward end of the switch tube S3 is the positive input end of the second transformation unit, the reverse end is coupled to one end of the inductor L3, and the other end of the inductor L3 is the positive output end of the second transformation unit The cathode of the diode D9 is coupled to the reverse end of the switch S3, the negative input end and the negative output end of the second transformer unit are both coupled to the anode of the diode D9, and the two capacitors C3 The terminals are respectively coupled to the anode of the diode D9 and the positive output terminal of the second transformer unit.
A DCDC circulating current control method, characterized in that the DCDC circulating current control device according to any one of claims 1-7 is adopted, which comprises:

Get the total number of converters and set it to N;

Get the current passing through the load R and set it to iout;

Obtain current i1 and current i2 of each converter;

Determine whether the values of current i1 and current i2 of each converter are equal to the value of iout divided by N; if not, the value of i1 and i2 is equal to the value of iout divided by N through the current sharing control and adjustment module.
An electronic device comprising a processor, a storage medium, and a computer program, the computer program being stored in the storage medium, wherein the computer program is executed by the processor to implement the DCDC circulation control method of claim 8 .
A computer-readable storage medium with a computer program stored thereon, wherein the computer program implements the DCDC circulation control method of claim 8 when the computer program is executed by a processor.