CN217607705U

CN217607705U - Power supply circuit and energy storage converter

Info

Publication number: CN217607705U
Application number: CN202221421534.8U
Authority: CN
Inventors: 胡期峰; 陈科; 赵德永; 冯春勤; 张志�; 郑照红
Original assignee: Trina Energy Storage Solutions Jiangsu Co Ltd
Current assignee: Trina Energy Storage Solutions Jiangsu Co Ltd
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2022-10-18
Anticipated expiration: 2032-06-07

Abstract

The utility model provides a power supply circuit and converter for energy storage, include: an input circuit having a first input terminal connected to a positive terminal of a power supply and a second input terminal connected to a negative terminal of the power supply; the voltage division circuit is provided with a plurality of charge storage units which are connected in series, and two ends of the voltage division circuit are connected between the first input end and the second input end in parallel; a plurality of transformers, each transformer having a first primary winding and a secondary winding; each switch is connected in series with the first primary winding of the corresponding transformer and then connected in parallel with the corresponding charge storage unit; an output circuit having a plurality of sub-output circuits, each sub-output circuit being connected to a secondary winding of a corresponding transformer; and the control circuit is connected with the first primary windings of the plurality of transformers and the plurality of switches. The utility model discloses a bleeder circuit that connects in parallel between two inputs of power supply circuit realizes carrying out the partial pressure to input voltage and handles to reduce the voltage that the switch bore.

Description

Power supply circuit and converter for energy storage

Technical Field

The utility model relates to an electric power system especially relates to a power supply circuit and converter for energy storage.

Background

At present, a power supply used by a power supply system of a converter for energy storage mainly takes a flyback power supply as a main power supply, and the power supply system using the flyback power supply has the advantage of simple structure. As the bus voltage increases, the input voltage of the converter for energy storage also increases, for example up to 1500V. The voltage resistance of a MOS Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor) in a power supply system using a flyback power supply needs to be improved. However, while increasing the withstand voltage of the MOS transistor leads to an increase in cost, the withstand voltage of the MOS transistor has an upper limit and cannot be increased indefinitely.

One current solution to this problem includes using a flyback power supply with MOS transistors connected in series to increase the withstand voltage. But is limited by the number of MOS transistors in series, which is difficult to continue. The other solution is to adopt a double-end flyback topology, but the withstand voltage of the MOS transistor needs to be increased as the bus voltage increases.

Therefore, how to increase the input voltage of the power supply circuit is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a power supply circuit and converter for energy storage suitable for high input voltage.

The utility model discloses a solve above-mentioned technical problem and the technical scheme who adopts is a power supply circuit, include: an input circuit having a first input terminal connected to a positive terminal of a power supply and a second input terminal connected to a negative terminal of the power supply; a voltage division circuit having a plurality of charge storage cells connected in series, both ends of the voltage division circuit being connected in parallel between the first input terminal and the second input terminal; a plurality of transformers, each of the transformers having a first primary winding and a secondary winding; each switch is connected in series with the corresponding first primary winding of the transformer and then connected in parallel with the corresponding charge storage unit; an output circuit having a plurality of sub-output circuits, each of the sub-output circuits being connected to the secondary winding of a corresponding one of the transformers; and a control circuit connected to the plurality of switches.

In an embodiment of the invention, the voltage dividing circuit further includes a resistor connected in parallel with each of the charge storage units.

In an embodiment of the present invention, the charge storage unit includes a capacitor or a battery.

The utility model discloses an in an embodiment, control circuit includes comparison module and control module, comparison module's sampling end with the one end of the secondary winding of a plurality of transformers is connected to obtain a plurality of secondary windings's electric current size, and compare and obtain the comparison result, comparison module's output with control module's signal input part connects, with to control module conveys the comparison result, control module's signal output part with the control end of a plurality of switches is connected, with control a plurality of switches are opened and the length is long when closed.

In an embodiment of the present invention, the power supply circuit further includes: a plurality of snubber circuits, each snubber circuit including a resistor and a capacitor connected in parallel, each snubber circuit being connected in parallel with the first primary winding of each transformer.

The utility model discloses an in an embodiment, the transformer still includes the second primary winding, power supply circuit still includes diode and energy storage unit, wherein, the diode is connected the one end of energy storage unit with between the one end of second primary winding, the other end of storage unit with the other end of second primary winding is connected, the second primary winding the diode with the energy storage unit is constituteed and is swashed the circuit, every the one end of charge storage unit and one the one end of swashing the circuit is connected, swashs the other end of circuit with control circuit connects.

In an embodiment of the present invention, the energy storage unit includes a capacitor or a battery.

In an embodiment of the present invention, each of the sub-output circuits further includes a filter circuit, the filter circuit includes a first capacitor, a second capacitor and an inductor, wherein the first capacitor is connected to both ends of the secondary winding, one end of the inductor is connected to one end of the secondary winding, and the second capacitor is connected to the other end of the inductor and between the other ends of the secondary winding.

In an embodiment of the present invention, each of the sub-output circuits further includes: the anode of the first diode is connected with one end of the secondary winding, and the cathode of the first diode is connected with one end of the first capacitor; and/or the anode of the second diode is connected with the other end of the inductor, and the cathode of the second diode is connected with one end of the corresponding sub-output circuit.

The utility model discloses a solve above-mentioned problem and still provide a converter for energy storage, include as before the power supply circuit.

The utility model discloses a power supply circuit realizes carrying out the partial pressure to input voltage through parallelly connected bleeder circuit between two inputs at power supply circuit and handles to reduce the voltage that the switch bore.

Drawings

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, wherein:

fig. 1 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a sub-output circuit according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and the present invention is therefore not limited to the specific embodiments disclosed below.

As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.

In describing the embodiments of the present invention in detail, the cross-sectional view showing the structure of the device is not enlarged partially according to the general scale for the convenience of illustration, and the schematic diagram is only an example, which should not limit the protection scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

It should be noted that the terms "first", "second", etc. are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application should not be construed to be limited.

Next, the power supply circuit and the energy storage converter of the present invention will be described with reference to specific embodiments.

Fig. 1 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present invention, and referring to fig. 1, in this embodiment, the power supply circuit 100 includes an input circuit, a voltage dividing circuit 120, a plurality of transformers 130, a plurality of switches 140, an output circuit 150, and a control circuit 160.

Specifically, referring to fig. 1, the input circuit has a first input 111 connected to the positive pole of the power supply and a second input 112 connected to the negative pole of the power supply. The voltage divider circuit 120 has a plurality of charge storage units 121 connected in series, and both ends of the voltage divider circuit 120 are connected in parallel between the first input terminal 111 and the second input terminal 112 of the input circuit 112.

In an embodiment of the present invention, the charge storage unit 121 is not limited to the capacitor shown in fig. 1, and may be a battery. Preferably, the capacitance values between different capacitors and the voltage between different batteries are the same, so that the voltage input into the power supply circuit 100 can be equally divided. It is understood that the number of the charge storage units 121 in the voltage divider circuit 120 can be adjusted according to actual requirements, and as the number of the charge storage units 121 increases, the voltage carried by each charge storage unit 121 decreases accordingly.

Referring to fig. 1, in some other embodiments of the present invention, the voltage divider circuit 120 further includes a resistor 122 connected in parallel with each charge storage unit 121. By connecting the resistor 122 in parallel with each charge storage unit 121, it is possible to prevent a voltage division difference between the charge storage units due to a specification difference between the charge storage units 121 or an accidental damage of the individual charge storage units. For example, when the charge storage unit 121 is implemented as a capacitor, since a resistor is connected in parallel with each capacitor, when the capacitance values of the capacitors are different or the capacitors are accidentally damaged, the same voltage division between the capacitors in the voltage division circuits 120 can be ensured by the resistors connected in parallel.

With continued reference to fig. 1, each transformer 130 has a first primary winding 131 and a secondary winding 132. When the power supply circuit 100 is in operation, the high-voltage dc input to the power supply circuit 100 can be converted into low-voltage dc by the first primary winding 131 and the secondary winding 132 corresponding thereto, and the low-voltage dc can be supplied to external components through the output circuit 150.

The switch 140 in the power supply circuit 100 is connected in series with the first primary winding 131 of the corresponding transformer 130 and then connected in parallel with the corresponding charge storage unit 121. The switch 140 in an embodiment of the present invention may be a MOS transistor. Referring to fig. 1, the switch 140 is connected to one end of the corresponding charge storage unit 121 through a resistor 141.

In the above-described embodiment, the plurality of charge storage units 121 in the voltage dividing circuit 120 connected in parallel between the first input terminal 111 and the second input terminal 112 can divide the voltage input into the power supply circuit 100. The voltage applied to the switch 140 is reduced by the voltage divider circuit 120 dividing the voltage input to the power supply circuit 100. Thus, the input voltage of the power supply circuit 100 can be increased, and the voltage value carried by the switch 140 is ensured to be smaller than the withstand voltage value.

Fig. 2 is a schematic diagram of a sub-output circuit according to an embodiment of the present invention, and referring to fig. 1 and fig. 2, the output circuit 150 has a plurality of sub-output circuits 151, and each sub-output circuit 151 is connected to the secondary winding 132 of the corresponding transformer 130. The plurality of sub-output circuits 151 are connected in parallel through the conductive line 210, thereby collecting currents output from the plurality of sub-output circuits 151 together. The switch 140 is adapted to control the on/off of the corresponding first primary winding 131, so as to control the output current value of the sub-output circuit 151 corresponding to the first primary winding 131. The current values output by the sub-output circuits 151 can be controlled by the switches 140, so that the current values output by the sub-output circuits 151 are equal.

Next, the control process for each sub-output circuit 151 will be described in detail by way of example.

Referring to fig. 1, the power supply circuit 100 has a control circuit 160, and the control circuit 160 includes a comparison module 161 and a control module 162. Specifically, the plurality of sampling terminals 161a of the comparing module 161 are respectively connected to one end of the secondary windings 132 of all the transformers 130, so as to obtain the magnitude of the current output by all the secondary windings 132, and compare the current values of different secondary windings 132 with preset values to obtain a comparison result. The output of the comparison module 161 is then connected to the signal input of the control module 162 to transmit the comparison result to the control module 162. The plurality of control modules 162 are connected to the plurality of switches 140 corresponding thereto to control the on/off durations of the different switches 140, so as to achieve the purpose of regulating the current value of each sub-output circuit 151.

To facilitate understanding of the above regulation process, a specific example is given here. Referring to fig. 1, first, the comparison module 161 finds that a current value output by one sub-output circuit 151 is smaller than a preset value by comparing current values from the respective sub-output circuits 151 obtained by the respective sampling terminals 161 a. Then, the comparing module 161 sends the comparison result to the control module 162, and the control module 162 prolongs the on time of the switch 140 corresponding to the sub-output circuit 151 having the output current value smaller than the predetermined value. For example, the control module 162 may send a Pulse Width Modulation (PWM) signal with a higher duty ratio to the switch 140 to prolong the on-time of the switch 140, and the current output by the sub-output circuit 151 increases as the on-time of the switch 140 increases. Finally, the comparing module 161 monitors the output current value of the sub-output circuit 151 in real time, and when the current value reaches a preset value, the control is stopped, otherwise, the control is continued.

Referring to fig. 2, in an embodiment of the present invention, each sub-output circuit 151 further includes a filter circuit. Specifically, the filter circuit includes a first capacitor 152a, a second capacitor 152b, and an inductor 152c, where the first capacitor 152a is connected to two ends of the secondary winding 132, one end of the inductor 152c is connected to one end of the secondary winding 132, and the second capacitor 152b is connected between the other end of the inductor 152c and the other end of the secondary winding 132. The filter circuit may perform filtering processing on the current output by the sub-output circuit 151.

In addition, referring to fig. 2, in an embodiment of the present invention, each sub-output circuit 151 further includes a sub-output circuit 151, an anode of the first diode 151a is connected to one end of the secondary winding 131, and a cathode is connected to one end of the first capacitor 152 a. In another embodiment of the present invention, each sub-output circuit 151 further includes a first diode 151b, an anode of the second diode 151b is connected to the other end of the inductor 152c, and a cathode is connected to one end of the corresponding sub-output circuit 151. The first diode and/or the second diode in each sub-output circuit only allow the current to pass in one direction, and the mutual influence among the sub-output circuits is avoided.

Referring to fig. 2, in some other embodiments of the present invention, each sub-output circuit 151 has both a first diode 151a and a second diode 151b. For the specific connection manner of the first diode 151a and the second diode 151b in each sub-output circuit 151, reference may be made to the above two embodiments, and details are not repeated here. By connecting the first diode 151a and/or the second diode 151b to each sub-output circuit 151, it is possible to prevent different sub-output circuits 151 from being affected by each other.

Referring to fig. 1, in an embodiment of the present invention, the power supply circuit 100 further includes a plurality of snubber circuits 170, each snubber circuit 170 includes a resistor 171 and a capacitor 172 connected in parallel, and each snubber circuit 170 is connected in parallel to the first primary winding 131 of each transformer 130. The snubber circuit 170 is adapted to protect the first primary winding 131 from an impact caused by a voltage change when the voltage input to the power supply circuit 100 changes.

In some embodiments of the present invention, the power supply circuit 100 further includes a second primary winding 133, a diode 180, and an energy storage unit 192. Specifically, the diode 180 is connected between one end of the energy storage unit 192 and one end of the second primary winding 133, and the other end of the energy storage unit 192 is connected to the other end of the second primary winding 133. In this embodiment, the second primary winding 133, the diode 180, and the energy storage unit 192 together form a flyback circuit. One end of the flyback circuit is connected to the control circuit 160, and the other end of the flyback circuit is connected to the other end of each of the charge storage units 121. The energy storage unit 192 in the flyback circuit may be used to provide the power required to start the control circuit 160, and the energy storage unit 192 in this example is a capacitor. In other embodiments, the energy storage unit 192 may also be a battery. After starting, the power supply circuit 100 starts to operate, and supplies power 160 to the control circuit through the second primary winding 133 without an external power supply.

In the embodiment, the voltage division circuit is connected in parallel between the input ends of the power supply circuit of the power supply, so that the voltage division processing of the input voltage is realized, and the voltage born by the switch is reduced.

The utility model discloses another aspect still provides a converter for the energy storage, and this energy storage converter includes as before the power supply circuit. The utility model discloses an in one embodiment, this converter for energy storage's one end is connected with external power source, and the other end is connected with the energy storage unit electricity to charge to the energy storage unit, or outwards discharge from the energy storage unit.

The utility model discloses a converter for the energy storage can carry out the partial pressure to input voltage and handle to reduce the voltage that the switch bore.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, though not expressly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, the present application uses specific words to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Where numerals describing the number of components, attributes or the like are used in some embodiments, it is to be understood that such numerals used in the description of the embodiments are modified in some instances by the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit-preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

Claims

1. A power supply circuit, comprising:

an input circuit having a first input terminal connected to a positive terminal of a power supply and a second input terminal connected to a negative terminal of the power supply;

a voltage division circuit having a plurality of charge storage cells connected in series, both ends of the voltage division circuit being connected in parallel between the first input terminal and the second input terminal;

a plurality of transformers, each of the transformers having a first primary winding and a secondary winding;

each switch is connected in series with the corresponding first primary winding of the transformer and then connected in parallel with the corresponding charge storage unit;

an output circuit having a plurality of sub-output circuits, each of the sub-output circuits being connected to the secondary winding of a corresponding one of the transformers; and

and the control circuit is connected with the plurality of switches.

2. The power supply circuit of claim 1 wherein said voltage divider circuit further comprises a resistor in parallel with each of said charge storage units.

3. The power supply circuit of claim 1, wherein the charge storage unit comprises a capacitor or a battery.

4. The power supply circuit according to claim 1, wherein the control circuit comprises a comparison module and a control module, a sampling terminal of the comparison module is connected to one terminal of the secondary windings of the transformers to obtain current magnitudes of the secondary windings, and the comparison module compares the current magnitudes to obtain a comparison result, an output terminal of the comparison module is connected to a signal input terminal of the control module to transmit the comparison result to the control module, and a signal output terminal of the control module is connected to control terminals of the switches to control durations of opening and closing of the switches.

5. The power supply circuit of claim 1, further comprising: a plurality of snubber circuits, each of the snubber circuits including a resistor and a capacitor connected in parallel, each of the snubber circuits being connected in parallel with the first primary winding of each of the transformers.

6. The power supply circuit according to claim 1, wherein the transformer further comprises a second primary winding, the power supply circuit further comprises a diode and an energy storage unit, wherein the diode is connected between one end of the energy storage unit and one end of the second primary winding, the other end of the storage unit is connected to the other end of the second primary winding, the diode and the energy storage unit form a flyback circuit, one end of each charge storage unit is connected to one end of one flyback circuit, and the other end of the flyback circuit is connected to the control circuit.

7. The power supply circuit of claim 6, wherein the energy storage unit comprises a capacitor or a battery.

8. The power supply circuit of claim 1, wherein each of said sub-output circuits further comprises a filter circuit, said filter circuit comprising a first capacitor, a second capacitor and an inductor, wherein said first capacitor is connected across said secondary winding, one end of said inductor is connected across one end of said secondary winding, and said second capacitor is connected between the other end of said inductor and the other end of said secondary winding.

9. The power supply circuit of claim 8, wherein each of said sub-output circuits further comprises: the anode of the first diode is connected with one end of the secondary winding, and the cathode of the first diode is connected with one end of the first capacitor; and/or the anode of the second diode is connected with the other end of the inductor, and the cathode of the second diode is connected with one end of the corresponding sub-output circuit.

10. A converter for energy storage, characterized in that it comprises a power supply circuit according to any one of claims 1 to 9.