CN219477659U

CN219477659U - Power supply circuit and power supply system

Info

Publication number: CN219477659U
Application number: CN202320135713.3U
Authority: CN
Inventors: 张元铭; 官威; 胡光铖
Original assignee: Shanghai Baizhu Chenghang New Energy Co ltd
Current assignee: Shanghai Baizhu Chenghang New Energy Co ltd
Priority date: 2023-01-12
Filing date: 2023-01-12
Publication date: 2023-08-04
Anticipated expiration: 2033-01-12

Abstract

The application discloses a power supply circuit and a power supply system. The power supply circuit comprises a first isolation conversion module or a second isolation conversion module, a first switch module and a second switch module. The first isolation conversion module converts the second power supply into a third power supply; the first switch module is conducted when the alternating current input power supply is larger than a first voltage threshold value and the third power supply is larger than or equal to the first power supply; the second switch module is turned on when the direct current input power supply is larger than the second voltage threshold value and the first power supply is larger than or equal to the third power supply. The second isolation conversion module converts the alternating current input power supply into a direct current fourth power supply isolated from the alternating current input power supply; the first switch module is conducted when the alternating current input power supply is larger than a first voltage threshold value and the fourth power supply is larger than or equal to the first power supply; the second switch module is turned on when the direct current input power supply is larger than the second voltage threshold value and the first power supply is larger than or equal to the fourth power supply. By the mode, the purpose of reducing cost can be achieved.

Description

Power supply circuit and power supply system

Technical Field

The present disclosure relates to the field of power technologies, and in particular, to a power supply circuit and a power supply system.

Background

In photovoltaic energy storage or energy storage power systems, the auxiliary power supply is generally provided with a power supply for supplying power to the control unit from the grid side and the battery side.

When power is required to be taken from the power grid side, the auxiliary power supply generally supplies power to not only the control unit but also other units at the same time, such as a fan for heat dissipation. This results in interaction between other units and the control unit, which may not meet safety requirements.

Further, to meet the requirements of safety regulations, an additional auxiliary power supply is usually required to separately supply power to the control unit, resulting in high cost.

Disclosure of Invention

The application aims to provide a power supply circuit and a power supply system, which can achieve the purpose of reducing cost.

To achieve the above object, in a first aspect, the present application provides a power supply circuit for supplying power to a controller, the power supply circuit further being connected to a dc auxiliary power supply and an ac auxiliary power supply, respectively, wherein the dc auxiliary power supply is used for converting a dc input power supply into a first power supply of a dc, and the ac auxiliary power supply is used for converting an ac input power supply into a second power supply of a dc, the power supply circuit comprising:

The first isolation conversion module or the second isolation conversion module, the first switch module and the second switch module;

when the power supply circuit includes the first isolated switching module,

the first isolation conversion module is connected between the alternating current auxiliary power supply and the first switch module, and is used for converting the second power supply into a third power supply and isolating the second power supply from the third power supply;

the first switch module is connected between the first isolation conversion module and a first node, and is used for being conducted when the voltage of the alternating current input power supply is larger than a first voltage threshold value and the voltage of the third power supply is larger than or equal to the voltage of the first power supply so as to output the voltage for supplying power to the controller at the first node based on the voltage of the third power supply, wherein the first node is a connection point between the first switch module and the second switch module;

the second switch module is connected between the direct current auxiliary power supply and the first node, and is used for being conducted when the voltage of the direct current input power supply is larger than a second voltage threshold value and the voltage of the first power supply is larger than or equal to the voltage of the third power supply so as to output the voltage for supplying power to the controller at the first node based on the voltage of the first power supply;

When the power supply circuit includes the second isolated switching module,

the second isolation conversion module is connected between the alternating current auxiliary power supply and the first switch module and is used for converting the alternating current input power supply into a fourth power supply isolated from the alternating current input power supply;

the first switch module is connected between the second isolation conversion module and the first node, and is used for being conducted when the voltage of the alternating current input power supply is greater than the first voltage threshold value and the voltage of the fourth power supply is greater than or equal to the voltage of the first power supply so as to output the voltage for supplying power to the controller at the first node based on the voltage of the fourth power supply;

the second switch module is connected between the direct current auxiliary power supply and the first node, and is used for being conducted when the voltage of the direct current input power supply is larger than the second voltage threshold value and the voltage of the first power supply is larger than or equal to the voltage of the fourth power supply, so that the voltage for supplying power to the controller is output at the first node based on the voltage of the first power supply.

In an alternative manner, the dc auxiliary power supply is further configured to convert the dc input power supply to a fifth power supply having a polarity opposite to that of the first power supply;

the power supply circuit further includes: the third switch module and the fourth switch module;

when the power supply circuit includes the first isolated switching module,

the first isolation conversion module is further used for converting the second power supply into a sixth power supply and isolating the second power supply from the sixth power supply;

the third switch module is connected between the first isolation conversion module and a second node, and is used for being conducted when the voltage of the alternating current input power supply is greater than the first voltage threshold value and the voltage of the sixth power supply is smaller than or equal to the voltage of the fifth power supply, so that the voltage for supplying power to the controller is output at the second node based on the voltage of the sixth power supply, wherein the second node is a connection point between the third switch module and the fourth switch module, and the voltage polarity of the sixth power supply is opposite to that of the second power supply;

the fourth switch module is connected between the direct current auxiliary power supply and the second node, and is used for being conducted when the voltage of the direct current input power supply is larger than the second voltage threshold value and the voltage of the fifth power supply is smaller than or equal to the voltage of the sixth power supply, so that the voltage for supplying power to the controller is output at the second node based on the voltage of the fifth power supply;

When the power supply circuit includes the second isolated switching module,

the second isolation conversion module is further used for converting the alternating current input power supply into a seventh direct current power supply isolated from the alternating current input power supply;

the third switch module is connected between the second isolation conversion module and the second node, and is used for being conducted when the voltage of the alternating current input power supply is greater than a first voltage threshold value and the voltage of the seventh power supply is smaller than or equal to the voltage of the fifth power supply, so that the voltage for supplying power to the controller is output at the second node based on the voltage of the seventh power supply;

the fourth switch module is connected between the direct current auxiliary power supply and the second node, and is used for being conducted when the voltage of the direct current input power supply is larger than the second voltage threshold value and the voltage of the fifth power supply is smaller than or equal to the voltage of the seventh power supply, so that the voltage for supplying power to the controller is output at the first node based on the voltage of the fifth power supply.

In an optional manner, the power supply circuit further includes a first charge-discharge module, a second charge-discharge module, a third charge-discharge module, and a fourth charge-discharge module;

The first charge-discharge module is connected between the first node and the ground, and the second charge-discharge module is connected between the second node and the ground;

when the power supply circuit comprises a first isolation conversion module, the third charge-discharge module is connected between a third node between a first switch module and the first isolation conversion module and ground, and the fourth charge-discharge module is connected between a fourth node between the third switch module and the first isolation conversion module and ground;

when the power supply circuit comprises a second isolation conversion module, the third charge-discharge module is connected between a fifth node between the first switch module and the second isolation conversion module and the ground, and the fourth charge-discharge module is connected between a sixth node between the third switch module and the second isolation conversion module and the ground;

the first charge-discharge module, the second charge-discharge module, the third charge-discharge module and the fourth charge-discharge module are all used for filtering and maintaining the stability of the corresponding power supply.

In an alternative manner, when the power supply circuit includes the second isolated conversion module, the power supply circuit further includes a first voltage conversion module;

The first voltage conversion module is connected between the second isolation conversion module and the first switch module and is used for converting the fourth power supply into a stable eighth power supply;

the first switch module is further configured to be turned on when the voltage of the ac input power is greater than the first voltage threshold and the voltage of the eighth power is greater than or equal to the voltage of the first power, so as to output, at the first node, a voltage for powering the controller based on the voltage of the eighth power;

the second switch module is further configured to be turned on when the voltage of the dc input power is greater than the second voltage threshold and the voltage of the first power is greater than or equal to the voltage of the eighth power, so as to output, at the first node, a voltage for powering the controller based on the voltage of the first power.

In an alternative manner, the first isolation conversion module includes a transformer including a primary winding, a first secondary winding, and a second secondary winding;

the first end of the primary winding is connected with the first output end of the alternating current auxiliary power supply, the second end of the primary winding is connected with the second output end of the alternating current auxiliary power supply, the first end of the first secondary winding is connected to the first node through the first switch module, the second end of the first secondary winding and the first end of the second secondary winding are grounded, and the second end of the second secondary winding is connected to the second node through the third switch module.

In an alternative manner, the second isolated conversion module includes a third secondary winding, a fourth secondary winding, a first diode, and a second diode;

the first end of the third secondary winding is connected with the anode of the first diode, the second end of the third secondary winding is grounded with the first end of the fourth secondary winding, the second end of the fourth secondary winding is connected with the cathode of the second diode, the cathode of the first diode is connected to the first node through the first switch module, and the anode of the second diode is connected to the second node through the third switch module;

wherein the third secondary winding and the fourth secondary winding are both coupled to the same core as the primary winding in the ac auxiliary power supply 300.

In an optional manner, the second isolation conversion module further includes a first filter inductor, a second filter inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor;

the first end of the first filter inductor is respectively connected with the first switch module and the first end of the first filter capacitor, the second end of the first filter inductor is respectively connected with the cathode of the first diode and the first end of the second filter capacitor, the second end of the first filter capacitor, the second end of the second filter capacitor, the second end of the third filter capacitor and the second end of the fourth filter capacitor are grounded, the first end of the third filter capacitor is respectively connected with the first end of the second filter inductor and the third switch module, and the second end of the second filter inductor is respectively connected with the first end of the fourth filter capacitor and the anode of the second diode.

In an alternative manner, the first, second, third and fourth switch modules each comprise a diode;

the forward conduction of the diode in the first switch module corresponds to the conduction of the first switch module, the forward conduction of the diode in the second switch module corresponds to the conduction of the second switch module, the forward conduction of the diode in the third switch module corresponds to the conduction of the third switch module, and the forward conduction of the diode in the fourth switch module corresponds to the conduction of the fourth switch module.

In an optional manner, the first charge-discharge module, the second charge-discharge module, the third charge-discharge module, and the fourth charge-discharge module each include a capacitor;

the two ends of the capacitor are two ends of the corresponding charge-discharge module.

In a second aspect, the present application provides a power supply system comprising a controller, a dc auxiliary power supply, an ac auxiliary power supply and a power supply circuit as described above;

the power supply circuit is respectively connected with the controller, the direct-current auxiliary power supply and the alternating-current auxiliary power supply, and is used for outputting voltage for supplying power to the controller based on the power supplied by the direct-current auxiliary power supply and the alternating-current auxiliary power supply.

The beneficial effects of this application are: the power supply circuit that this application provided is used for supplying power for the controller, and power supply circuit still is used for being connected with direct current auxiliary power supply and alternating current auxiliary power supply respectively, and wherein, direct current auxiliary power supply is used for converting direct current input power supply into direct current's first power, and alternating current auxiliary power supply is used for converting alternating current input power supply into direct current's second power. When the power supply circuit comprises a first isolation conversion module, a first switch module and a second switch module, if the voltage of the alternating current input power supply is greater than or equal to a first voltage threshold value and the voltage of the third power supply is greater than or equal to the voltage of the first power supply, the first switch module is conducted. Then, the third power supply output through the first isolation conversion module can output the voltage for supplying power to the controller at the first node, that is, the actual power supply source of the controller is an alternating current input power supply. If the voltage of the direct current input power supply is greater than or equal to the second voltage threshold value and the voltage of the first power supply is greater than or equal to the voltage of the third power supply, the second switch module is conducted. Then, the voltage of the first power supply can output the voltage for supplying power to the controller at the first node, that is, the actual power supply source of the controller is a direct current input power supply. Therefore, the process of supplying power to the controller by the alternating current input power supply or the direct current input power supply is realized. In the process, the second power supply and the third power supply are isolated, so that even if the second power supply is also used for supplying power to other units, the second power supply cannot interact with a controller based on the third power supply, and the safety regulation requirement is met. Meanwhile, the auxiliary power supply is not required to be added as the related technology, so that the aim of reducing the cost can be achieved. When the power supply circuit includes the second isolation conversion module, the first switch module and the second switch module, based on an analysis process similar to the above process, it is known that even if the second power supply is used for supplying power to other units, the power supply of the controller is from the fourth power supply, and the fourth power supply and the second power supply do not affect each other, so as to meet the safety requirements. In addition, the auxiliary power supply is not needed to be added as the related technology, and the aim of reducing the cost can be achieved

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

Fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 9 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present disclosure.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application. As shown in fig. 1, the power supply circuit 100 is used to supply power to a controller 200. The power supply circuit 100 is also connected to the dc auxiliary power supply 400 and the ac auxiliary power supply 300, respectively. The dc auxiliary power supply 400 is used for converting a dc input power supply VIN1 into a first power supply V1 with dc, and the ac auxiliary power supply 300 is used for converting an ac input power supply VIN2 into a second power supply V2 with dc.

The power supply circuit 100 includes a first switch module 102, a second switch module 104, and a first isolated switching module 106. The first isolation conversion module 106 is connected between the ac auxiliary power supply 300 and the first switch module 102, the first switch module 102 is connected between the first isolation conversion module 106 and the first node N1, and the second switch module 104 is connected between the dc auxiliary power supply 400 and the first node N1. The first node N1 is a connection point between the first switch module 102 and the second switch module 104. The controller 200 is also connected to the first node N1.

Specifically, the first isolation conversion module 106 is configured to convert the second power V2 into the third power V3, and isolate the second power V2 from the third power V3. The first switch module 102 is configured to be turned on when the voltage of the ac input power source VIN2 is greater than the first voltage threshold and the voltage of the third power source V3 is greater than or equal to the voltage of the first power source V1, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the third power source V3. The second switch module 104 is configured to be turned on when the voltage of the dc input power source VIN1 is greater than the second voltage threshold and the voltage of the first power source V1 is greater than or equal to the voltage of the third power source V3, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the first power source V1.

It should be noted that, the first voltage threshold and the second voltage threshold may be set according to practical application, which is not limited in this embodiment of the present application. For example, in one embodiment, when the first voltage threshold and the second voltage threshold are both set to 0, the voltage of the ac input power source VIN2 is greater than the first voltage threshold, which corresponds to the ac input power source VIN2 having power. At this time, the ac input power source VIN2 can be used as a power source of the controller 200. Similarly, the voltage of the dc input power source VIN1 is greater than the second voltage threshold and corresponds to the dc input power source VIN1 having power, and at this time, the dc input power source VIN1 can be used as a power source of the controller 200. The first voltage threshold and the second voltage threshold may be the same or different

Second, in embodiments of the present application, the manner in which switching between two power supplies is accomplished is typically either buck or boost. For example, converting the second power supply V2 into the third power supply V3 means that the voltage of the second power supply V2 is stepped up or stepped down to obtain the third power supply V3.

Furthermore, achieving isolation between two power supplies refers to the electrical isolation of the two power supplies. For example, isolating the second power source V2 from the third power source V3 means that the second power source V2 and the third power source V3 are electrically isolated and independent from each other.

In practical applications, if the voltage of the ac input power source VIN2 is greater than the first voltage threshold, it can be determined that the voltage of the ac input power source VIN2 can be used as the power source of the controller 200. Then, the second power V2 output from the ac auxiliary power supply 300 through the first isolation conversion module 106 is converted into a third power V3 capable of supplying power to the controller 200. If the voltage of the third power V3 is greater than or equal to the voltage of the first power V1, the first switch module 102 is turned on, and the second switch module 104 is turned off. The third power source V3 supplies power to the controller 200 through the first switch module 102 and the first node N1.

In the related art, the second power V2 is generally directly used for power supply of a control unit (corresponding to the controller 200 in the embodiment of the present application) and other units (such as a fan for heat dissipation), and thus the safety requirements cannot be met due to the interaction between the different units. In the embodiment of the present application, by adding the first isolation conversion module 106, on one hand, voltage conversion can be implemented to output the third power V3 capable of supplying power to the controller 200, thereby meeting the power supply requirement; on the other hand, the isolation between the second power supply V2 and the third power supply V3 is realized, and the second power supply V2 is used for supplying power to other units, and the third power supply V3 supplies power to the controller 200, so that the controller 200 and other units cannot be affected mutually, and the safety requirements can be met.

Second, in the related art, in order to meet the safety requirements, an additional ac auxiliary power supply 200 is generally required to obtain another power supply for separately supplying power to the controller 200 based on the ac input power supply VIN2, which results in an increase in cost. In the embodiment of the present application, no additional ac auxiliary power source 200 is needed, thereby reducing the cost.

If the voltage of the dc input power source VIN1 is greater than the second voltage threshold, it can be determined that the voltage of the dc input power source VIN1 can be used as the power source of the controller 200. The first power V1 output from the dc auxiliary power supply 400 can supply power to the controller 200. If the voltage of the first power V1 is greater than or equal to the voltage of the third power V3, the second switch module 104 is turned on, and the first switch module 102 is turned off. The first power source V1 supplies power to the controller 200 through the second switch module 104 and the first node N1.

Therefore, when the voltage of the ac input power source VIN2 can be used as the power source of the controller 200, if the voltage of the third power source V3 is greater than or equal to the voltage of the first power source V1, the third power source V3 supplies power to the controller 200; when the voltage of the dc input power source VIN1 can be used as the power source of the controller 200, if the voltage of the first power source V1 is greater than or equal to the voltage of the third power source V3, the first power source V1 supplies power to the controller 200.

In an embodiment, as shown in fig. 2, the dc auxiliary power supply 400 is further used for converting the dc input power supply VIN1 into a dc fifth power supply V5. The fifth power V5 has a voltage polarity opposite to that of the first power V1. If the voltage of the first power V1 is a positive voltage, the voltage of the fifth power V5 is a negative voltage.

The power supply circuit 100 further includes a third switching module 108 and a fourth switching module 110. The third switch module 108 is connected between the first isolated conversion module 106 and the second node N2, and the fourth switch module 110 is connected between the dc auxiliary power supply 400 and the second node N2. The second node N2 is a connection point between the third switch module 108 and the fourth switch module 110.

Specifically, the first isolation conversion module 106 is further configured to convert the second power V2 into the sixth power V6, and isolate the second power V2 from the sixth power V6. The third switch module 108 is configured to be turned on when the voltage of the ac input power source VIN2 is greater than or equal to the first voltage threshold and the voltage of the sixth power source V6 is less than or equal to the voltage of the fifth power source V5, so as to output a voltage for powering the controller 200 at the second node N2 based on the voltage of the sixth power source V6. The voltage polarity of the sixth power supply V6 is opposite to that of the second power supply V2. The fourth switch module 110 is configured to be turned on when the voltage of the dc input power source VIN1 is greater than or equal to the second voltage threshold and the voltage of the fifth power source V5 is less than or equal to the voltage of the sixth power source V6, so as to output a voltage for powering the controller 200 at the second node N2 based on the voltage of the fifth power source V5.

In practical applications, the voltage of the ac input power source VIN2 can be determined as the power source of the controller 200 by determining that the voltage of the ac input power source VIN2 is greater than the first voltage threshold. Then, the second power V2 output from the ac auxiliary power supply 300 through the first isolation conversion module 106 is converted into a sixth power V6 capable of supplying power to the controller 200. If the voltage of the sixth power V6 is less than or equal to the voltage of the fifth power V2, the third switch module 108 is turned on, and the fourth switch module 110 is turned off. The sixth power V6 supplies power to the controller 200 through the third switch module 108 and the second node N2.

Determining that the voltage of the dc input power source VIN1 is greater than the second voltage threshold can be used as a power source for the controller 200. Also, the fifth power V5 output from the dc auxiliary power supply 400 can supply power to the controller 200. If the voltage of the fifth power V5 is less than or equal to the voltage of the sixth power V6, the fourth switch module 110 is turned on, and the third switch module 108 is turned off. The fifth power V5 supplies power to the controller 200 through the fourth switch module 110 and the second node N2.

Therefore, when the voltage of the ac input power source VIN2 can be used as the power source of the controller 200, if the voltage of the sixth power source V6 is less than or equal to the voltage of the fifth power source V2, the sixth power source V6 supplies power to the controller 200; when the voltage of the dc input power VIN1 can be used as the power source of the controller 200, if the voltage of the fifth power V5 is less than or equal to the voltage of the sixth power V6, the fifth power V5 supplies power to the controller 200.

In summary, by the above manner, it is realized that the controller 200 is supplied with power through one of the first power source V1 and the third power source V3, and the controller 200 is supplied with power through one of the fifth power source V5 and the sixth power source V6. The polarities of the first power V1 and the third power V3 are the same, the polarities of the fifth power V5 and the sixth power V6 are the same, and the polarities of the first power V1 and the fifth power V5 are different. For example, the voltages of the first power V1 and the third power V3 are positive voltages; the voltages of the fifth power V5 and the sixth power V6 are negative voltages. Then, positive voltage power and negative voltage power can be provided for the controller 200 simultaneously, so as to meet the power supply requirements of different controllers 200, and the practicality is improved.

In an embodiment, as shown in fig. 3, the power supply circuit 100 further includes a first charge-discharge module 112, a second charge-discharge module 114, a third charge-discharge module 116, and a fourth charge-discharge module 118.

The first charge/discharge module 112 is connected between the first node N1 and the ground GND, and the second charge/discharge module 114 is connected between the second node N2 and the ground GND. The third charge/discharge module 116 is connected between the third node N3 between the first switch module 102 and the first isolation conversion module 106 and the ground GND, and the fourth charge/discharge module 118 is connected between the fourth node N4 between the third switch module 108 and the first isolation conversion module 106 and the ground GND.

Specifically, the first charge-discharge module 112, the second charge-discharge module 114, the third charge-discharge module 116 and the fourth charge-discharge module 118 are all used for filtering and maintaining the stability of the corresponding power sources. The first charge-discharge module 112 is configured to filter the power of the first node N1 and maintain stability thereof; the second charge-discharge module 114 is configured to filter and maintain stability of the power supply of the second node N2; the third charge-discharge module 116 is configured to filter the power supply of the third node N3 and maintain stability thereof; the fourth charge-discharge module 118 is configured to filter and maintain stability of the power supply of the fourth node N4. By providing the first charge-discharge module 112, the second charge-discharge module 114, the third charge-discharge module 116 and the fourth charge-discharge module 118, each power supply has higher stability, which is beneficial to improving the reliability of the operation of the power supply circuit 100.

Referring to fig. 4, fig. 4 illustrates a circuit configuration of the power supply circuit 100.

In one embodiment, as shown in fig. 4, the first switch module 102, the second switch module 104, the third switch module 108, and the fourth switch module 110 each include a diode. Specifically, the first switch module 102 includes a third diode D3, the second switch module 104 includes a fourth diode D4, the third switch module 108 includes a fifth diode D4, and the fourth switch module 110 includes a sixth diode D6.

The forward conduction of the diode in the first switch module 102 corresponds to the conduction of the first switch module 102, i.e. the forward conduction of the third diode D3 corresponds to the conduction of the first switch module 102. The forward conduction of the diode in the second switch module 104 corresponds to the conduction of the second switch module 104, i.e. the forward conduction of the fourth diode D4 corresponds to the conduction of the second switch module 104. The forward conduction of the diode in the third switch module 108 corresponds to the conduction of the third switch module 108, i.e. the forward conduction of the fifth diode D5 corresponds to the forward conduction of the third switch module 108. The forward conduction of the diode in the fourth switch module 110 corresponds to the conduction of the fourth switch module 110, i.e. the forward conduction of the sixth diode D6 corresponds to the conduction of the fourth switch module 110.

In an embodiment, the first charge-discharge module 112, the second charge-discharge module 114, the third charge-discharge module 116 and the fourth charge-discharge module 118 all include capacitors. Specifically, the first charge-discharge module 112 includes a first capacitor C1, the second charge-discharge module 114 includes a second capacitor C2, the third charge-discharge module 116 includes a third capacitor C3, and the fourth charge-discharge module 118 includes a fourth capacitor C4.

Specifically, two ends of each capacitor are two ends of the corresponding charge-discharge module. Namely, two ends of the first capacitor C1 correspond to two ends of the first charge-discharge module 112; both ends of the second capacitor C2 correspond to both ends of the second charge-discharge module 114; both ends of the third capacitor C3 correspond to both ends of the third charge-discharge module 116; both ends of the fourth capacitor C4 correspond to both ends of the fourth charge-discharge module 118.

In this embodiment, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are configured to filter the power supplies of the first node N1, the second node N2, the third node N3 and the fourth node N4 respectively, and the voltages of these power supplies are kept relatively stable, so as to improve the stability of the operation of the power supply circuit.

It will be appreciated that in this embodiment, each charge and discharge module includes a capacitor, for example, while in other embodiments, each charge and discharge module may include a plurality of capacitors to perform different functions. For example, the first capacitor C1 may be composed of a ceramic capacitor and an electrolytic capacitor connected in series.

In an embodiment, the first isolation conversion module 106 includes a transformer T1, and the transformer T1 includes a primary winding L1, a first secondary winding L2, and a second secondary winding L3.

The first end of the primary winding L1 is connected to the first output end of the ac auxiliary power supply 300, the second end of the primary winding L1 is connected to the second output end of the ac auxiliary power supply 300, the first end of the first secondary winding L2 is connected to the first node N1 through the first switch module 102, the second end of the first secondary winding L2 and the first end of the second secondary winding L3 are both grounded GND, and the second end of the second secondary winding L3 is connected to the second node N2 through the third switch module 108.

In this embodiment, the conversion of the second power supply V2 into the third power supply V3 can be achieved by setting the turns ratio of the primary winding L1 to the first secondary winding L2. By setting the turns ratio of the primary winding L1 to the second secondary winding L3, conversion of the second power supply V2 into the sixth power supply V6 can be achieved. Meanwhile, the transformer T1 can perform an isolation function to isolate the second power source V2 from the third power source V3 and isolate the second power source V2 from the sixth power source V6, so that even if the second power source V2 is used for supplying power to units outside the controller 200, the units and the controller 200 do not affect each other, and the safety requirements are met.

One configuration of the ac auxiliary power supply 300 and the dc auxiliary power supply 400 is also illustrated in fig. 4. As shown in fig. 4, the ac auxiliary power supply 300 includes a transformer T3, a ninth diode D9, a sixth inductor L6, a ninth capacitor C9, and a tenth capacitor C10. The dc auxiliary power supply 400 includes a transformer T2, a seventh diode D7, an eighth diode D8, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a fourth inductor L4, and a fifth inductor L5.

The primary winding of the transformer T3 is connected to the ac input power source VIN2, the first end of the secondary winding of the transformer T3 is connected to the anode of the ninth diode D9, the second end of the secondary winding of the transformer T3 is connected to the first end of the tenth capacitor C10, the first end of the ninth capacitor C9 and the second end of the second secondary winding L1 in the transformer T1, the cathode of the ninth diode D9 is connected to the first end of the sixth inductor L6 and the second end of the tenth capacitor C10, and the second end of the sixth inductor L6 is connected to the second end of the ninth capacitor C9 and the first end of the second secondary winding L1 in the transformer T1.

The primary winding of the transformer T2 is connected with a direct current input power supply VIN1, the first end of the first secondary winding of the transformer T2 is connected with the anode of a seventh diode D7, the cathode of the seventh diode D7 is respectively connected with the first end of a fifth capacitor C5 and the first end of a fourth inductor L4, the second end of the fourth inductor L4 is respectively connected with the first end of a sixth capacitor C6 and the anode of the fourth diode D4, and the second end of the first secondary winding of the transformer T2, the second end of the fifth capacitor C5 and the second end of the sixth capacitor C6 are all grounded to GND. The first end of the second secondary winding of the transformer T2 is connected with the anode of an eighth diode D8, the cathode of the eighth diode D8 is respectively connected with the first end of a seventh capacitor C7 and the first end of a fifth inductor L5, the second end of the fifth inductor L5 is respectively connected with the first end of the eighth capacitor C8 and the cathode of a sixth diode D6, and the second end of the second secondary winding of the transformer T2, the second end of the seventh capacitor C7 and the second end of the eighth capacitor C8 are all grounded GND.

Specifically, the transformer T2 and the transformer T3 are used for voltage conversion and isolation. The seventh diode D7, the eighth diode D8 and the ninth diode D9 are used for rectification. The ninth capacitor C9, the tenth capacitor C10 and the sixth inductor L6 form pi-type filtering. The fifth capacitor C5, the sixth capacitor C6 and the fourth inductor L4 form pi-type filtering. The seventh capacitor C7, the eighth capacitor C8 and the fifth inductor L5 form pi-type filtering.

The principle of the power supply circuit 100 will be described again below by taking the circuit configuration shown in fig. 4 as an example.

By setting the turns ratio of the primary winding L1 to the first secondary winding L2, conversion of the second power supply V2 to the third power supply V3 can be achieved. The power supply on the third node N3 is the third power supply V3. And the first power V1 outputted from the dc auxiliary power supply 400 acts on the anode of the fourth diode D4. Therefore, the on/off of the third diode D3 and the fourth diode D4 depends on the magnitude relation between the voltage of the first power V1 and the voltage of the third power V3.

When the voltage of the ac input power source VIN2 is greater than the first voltage threshold and the dc input power source VIN1 is less than or equal to the second voltage threshold, it may be determined that the voltage of the ac input power source VIN2 is used as the power source of the controller 200, or the power corresponding to the ac input power source VIN2 is available. At this time, the voltage of the third power V3 is necessarily greater than the voltage of the first power V1. The third diode D3 is turned on and the fourth diode D4 is turned off in the reverse direction. The voltage of the first node N1 is supplied by the third power supply V3.

When the voltage of the ac input power source VIN2 is less than or equal to the first voltage threshold and the dc input power source VIN1 is greater than the second voltage threshold, it may be determined that the voltage of the dc input power source VIN1 is used as the power source of the controller 200, or the power is supplied to the dc input power source VIN 1. At this time, the voltage of the first power V1 is necessarily greater than the voltage of the third power V3. The fourth diode D4 is turned on and the third diode D3 is turned off in the reverse direction. The voltage of the first node N1 is supplied by the first power supply V1.

When the voltage of the ac input power source VIN2 is greater than the first voltage threshold and the voltage of the dc input power source VIN1 is greater than the second voltage threshold, it may be determined that the ac input power source VIN2 or the voltage of the dc input power source VIN1 is used as the power source of the controller 200, or the ac input power source VIN2 and the dc input power source VIN1 may both have power. At this time, if the voltage of the first power V1 is greater than the voltage of the third power V3, the fourth diode D4 is turned on, and the third diode D3 is turned off reversely. The voltage of the first node N1 is supplied by a first power supply V1; if the voltage of the third power V3 is greater than the voltage of the first power V1, the third diode D3 is turned on, and the fourth diode D4 is turned off reversely. The voltage of the first node N1 is supplied by the third power supply V1.

Analysis of the voltage at the second node N2 in a similar manner as described above also determines from whom the voltage at the second node N2 is provided. Which are within the scope of those skilled in the art and will not be described in detail herein.

In the above manner, the process of supplying power to the controller 200 is realized. Also, in this embodiment, the isolation between the second power supply V2 and the third power supply V3, and the isolation between the second power supply V2 and the sixth power supply V6 are achieved by providing the transformer T1 to satisfy the safety requirements.

Referring to fig. 5, fig. 5 is another structure of a power supply circuit 100 according to an embodiment of the present application. As shown in fig. 5, the power supply circuit 100 includes a first switch module 102, a second switch module 104, and a second isolated switching module 120. The second isolated switching module 120 is connected between the ac auxiliary power supply 300 and the first switching module 102, the first switching module 102 is connected between the second isolated switching module 120 and the first node N1, and the second switching module 104 is connected between the dc auxiliary power supply 400 and the first node N1. The structure shown in fig. 5 is different from the structure shown in fig. 1 in that the first isolated conversion module 106 is replaced by the second isolated conversion module 120, and other modules are identical.

Specifically, the second isolated conversion module 102 is configured to convert the ac input power source VIN2 into a dc fourth power source V4 isolated from the ac input power source VIN 2. The first switch module 102 is configured to be turned on when the voltage of the ac input power source VIN2 is greater than the first voltage threshold and the voltage of the fourth power source V4 is greater than or equal to the voltage of the first power source V1, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the fourth power source V4. The second switch module 104 is configured to be turned on when the voltage of the dc input power source VIN1 is greater than the second voltage threshold and the voltage of the first power source V1 is greater than or equal to the voltage of the fourth power source V4, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the first power source V1.

In practical applications, if the voltage of the ac input power source VIN2 is greater than the first voltage threshold, it can be determined that the voltage of the ac input power source VIN2 can be used as the power source of the controller 200. Then, the ac input power source VIN2 is converted into a fourth power source V4 capable of supplying power to the controller 200 by the combination of the second isolated conversion module 102 and the ac auxiliary power source 300. If the voltage of the fourth power V4 is greater than or equal to the voltage of the first power V1, the first switch module 102 is turned on, and the second switch module 104 is turned off. The fourth power V4 supplies power to the controller 200 through the first switch module 102 and the first node N1.

Also in this embodiment, by adding the second isolation conversion module 102, on the one hand, voltage conversion can be achieved to output the fourth power V4 capable of supplying power to the controller 200, thereby meeting the power supply requirement; on the other hand, the fourth power V4 for supplying power to the controller 200 and the second power V2 output by the ac auxiliary power 300 are electrically independent from each other, so that other units are supplied with power by the second power V2, and the controller 200 is supplied with power by the fourth power V4, so that the controller 200 and other units are not affected by each other, and the safety requirements can be satisfied.

Second, in this embodiment, no additional ac auxiliary power source 200 is added, thereby reducing costs.

If the voltage of the dc input power source VIN1 is greater than the second voltage threshold, it can be determined that the voltage of the dc input power source VIN1 can be used as the power source of the controller 200. The first power V1 output from the dc auxiliary power supply 400 can supply power to the controller 200. If the voltage of the first power V1 is greater than the voltage of the fourth power V4, the second switch module 104 is turned on, and the first switch module 102 is turned off. The first power source V1 supplies power to the controller 200 through the second switch module 104 and the first node N1.

Therefore, when the voltage of the ac input power source VIN2 can be used as the power source of the controller 200, if the voltage of the fourth power source V4 is greater than or equal to the voltage of the first power source V1, the fourth power source V4 supplies power to the controller 200; when the voltage of the dc input power source VIN1 can be used as the power source of the controller 200, if the voltage of the first power source V1 is greater than or equal to the voltage of the fourth power source V4, the first power source V1 supplies power to the controller 200.

In an embodiment, referring to fig. 2, the third switch module 108 and the fourth switch module 110 are added to the structure of fig. 1, and the structures of the third switch module 108 and the fourth switch module 110 may be added to the structure of fig. 5, as shown in fig. 6.

As shown in fig. 6, the third switch module 108 is connected between the second isolated switching module 120 and the second node N2, and the fourth switch module 110 is connected between the dc auxiliary power source VIN1 and the second node N2.

Specifically, the second isolated conversion module 120 is further configured to convert the ac input power source VIN2 into a dc seventh power source V7 isolated from the ac input power source VIN 2. The third switch module 108 is configured to be turned on when the voltage of the ac input power source VIN2 is greater than the first voltage threshold and the voltage of the seventh power source V7 is less than or equal to the voltage of the fifth power source V5, so as to output a voltage for powering the controller 200 at the second node N2 based on the voltage of the seventh power source V7. The fourth switch module 110 is configured to be turned on when the voltage of the dc input power supply 400 is greater than the second voltage threshold and the voltage of the fifth power supply V5 is less than or equal to the voltage of the seventh power supply V7, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the fifth power supply V5.

In practical applications, the voltage of the ac input power source VIN2 can be determined as the power source of the controller 200 by determining that the voltage of the ac input power source VIN2 is greater than the first voltage threshold. Then, the ac input power source VIN2 is converted into a seventh power source V7 capable of supplying power to the controller 200 by the combination of the second isolated conversion module 120 and the ac auxiliary power source 300. If the voltage of the seventh power V7 is less than or equal to the voltage of the fifth power V2, the third switch module 108 is turned on, and the fourth switch module 110 is turned off. The seventh power V7 supplies power to the controller 200 through the third switch module 108 and the second node N2.

Determining that the voltage of the dc input power source VIN1 is greater than the second voltage threshold can be used as a power source for the controller 200. Also, the fifth power V5 output from the dc auxiliary power supply 400 can supply power to the controller 200. If the voltage of the fifth power V5 is less than or equal to the voltage of the seventh power V7, the fourth switch module 110 is turned on, and the third switch module 108 is turned off. The fifth power V5 supplies power to the controller 200 through the fourth switch module 110 and the second node N2.

Therefore, when the voltage of the ac input power source VIN2 can be used as the power source of the controller 200, if the voltage of the seventh power source V7 is less than or equal to the voltage of the fifth power source V2, the seventh power source V7 supplies power to the controller 200; when the voltage of the dc input power source VIN1 can be used as the power source of the controller 200, if the voltage of the fifth power source V5 is less than or equal to the voltage of the seventh power source V7, the fifth power source V5 supplies power to the controller 200.

In the above manner, it is achieved that the controller 200 is supplied with power through one of the first power source V1 and the fourth power source V4, and the controller 200 is supplied with power through one of the fifth power source V5 and the seventh power source V7. The polarities of the first power V1 and the fourth power V4 are the same, the polarities of the fifth power V5 and the seventh power V7 are the same, and the polarities of the first power V1 and the fifth power V5 are different. For example, the voltages of the first power V1 and the fourth power V4 are positive voltages; the voltages of the fifth power V5 and the seventh power V7 are negative voltages. Then, positive voltage power and negative voltage power can be provided for the controller 200 simultaneously, so as to meet the power supply requirements of different controllers 200, and the practicality is improved.

In an embodiment, referring to fig. 3, the first charge/discharge module 112, the second charge/discharge module 114, the third charge/discharge module 116 and the fourth charge/discharge module 118 are added to the structure of fig. 2, and the structures of the first charge/discharge module 112, the second charge/discharge module 114, the third charge/discharge module 116 and the fourth charge/discharge module 118 may be added to the structure of fig. 5, as shown in fig. 7.

The first charge-discharge module 112 is connected between the first node N1 and the ground GND, the second charge-discharge module 114 is connected between the second node N2 and the ground GND, the third charge-discharge module 116 is connected between the fifth node N5 between the first switch module 102 and the second isolation switch module 120 and the ground GND, and the fourth charge-discharge module 118 is connected between the sixth node N6 between the third switch module 108 and the second isolation switch module 120 and the ground GND. The first charge/discharge module 112, the second charge/discharge module 114, the third charge/discharge module 116 and the fourth charge/discharge module 118 are described in the above embodiments, and are not repeated here.

In an embodiment, as shown in fig. 8, the power supply circuit 100 further includes a first voltage conversion module 122. The first voltage conversion module 122 is connected between the second isolation conversion module 120 and the first switch module 102.

Specifically, the first voltage conversion module 122 is configured to convert the fourth power V4 into a stable eighth power V8. The first switch module 102 is further configured to be turned on when the voltage of the ac input power source VIN2 is greater than the first voltage threshold and the voltage of the eighth power source V8 is greater than or equal to the voltage of the first power source V1, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the eighth power source V8. The second switch module 104 is further configured to be turned on when the voltage of the dc input power source VIN1 is greater than the second voltage threshold and the voltage of the first power source V1 is greater than or equal to the voltage of the eighth power source V8, so as to output a voltage for powering the controller 200 at the first node N1 based on the voltage of the first power source V1.

In practical applications, when the voltage of the fourth power V4 output by the second isolated conversion module 12 is greater than the power supply voltage required by the controller 200, the first voltage conversion module 122 may be used to further convert the fourth power V4 to output a voltage capable of supplying power to the controller 200. Meanwhile, if the voltage of the fourth power V4 is an unstable voltage, the first voltage conversion module 122 can also be used to stabilize the voltage, so as to output a stable eighth power V8 to supply power to the controller 200, so as to maintain the stable and normal operation of the controller 200.

In an embodiment, the first voltage conversion module 122 may be implemented with a BUCK circuit, such as a BUCK circuit; BOOST circuits, such as BOOST circuits, may also be employed; or other types of voltage conversion circuits may be employed, such as low dropout linear regulators (Low Dropout Regulator, LDOs) and the like.

It should be noted that, in any embodiment of the present application, the voltage conversion module may be added in the same manner to obtain the required voltage. For example, with the structure shown in fig. 3, when the third power V3 cannot directly supply power to the controller 200, a voltage conversion module may be disposed between the first switch module 102 and the first isolation conversion module 106 to output a voltage that meets the power supply requirement of the controller 200.

Referring to fig. 9, a circuit corresponding to the structure shown in fig. 7 is exemplarily shown in fig. 9. The first switch module 102, the second switch module 104, the third switch module 106, the fourth switch module 108, the first charge/discharge module 112, the second charge/discharge module 114, the third charge/discharge module 116, the fourth charge/discharge module 118, the dc auxiliary power supply 400, and the ac auxiliary power supply 300 may refer to the description of fig. 4, and are not repeated here.

In an embodiment, as shown in fig. 9, the second isolated switching module 120 includes a third secondary winding L7, a fourth secondary winding L8, a first diode D1 and a second diode D2.

The first end of the third secondary winding L7 is connected to the anode of the first diode D1, the second end of the third secondary winding L7 and the first end of the fourth secondary winding L8 are both grounded GND, the second end of the fourth secondary winding L8 is connected to the cathode of the second diode D2, the cathode of the first diode D1 is connected to the first node N1 through the first switch module 102, and the anode of the second diode D2 is connected to the second node N2 through the third switch module 108. Wherein, the third secondary winding L7 and the fourth secondary winding L8 are both coupled to the same core as the primary winding in the ac auxiliary power supply 300.

Specifically, since the third secondary winding L7 and the fourth secondary winding L8 are both coupled to the same core as the primary winding in the ac auxiliary power supply 300, the combination of the third secondary winding L7 and the fourth secondary winding L8 with the primary winding in the ac auxiliary power supply 300 can be used as a transformer. The primary winding of the transformer is the primary winding in the ac auxiliary power supply 300, and the transformer includes two secondary windings, namely a third secondary winding L7 and a fourth secondary winding L8. By setting the turns ratio of the primary winding to the third secondary winding L7 in the ac auxiliary power supply 300, conversion of the ac input power supply VIN2 to the fourth power supply V4 can be achieved. By setting the turns ratio of the primary winding to the fourth secondary winding L8 in the ac auxiliary power supply 300, conversion of the ac input power supply VIN2 into the seventh power supply V7 can be achieved. The power output from the secondary winding in the ac auxiliary power supply 300 (the second power supply V2 in the above embodiment) can be used to supply power to the units other than the controller 200, so that these units and the controller 200 will not affect each other, and the safety requirements are satisfied.

In another embodiment, the second isolated conversion module 120 further includes a first filter inductor L9, a second filter inductor L10, a first filter capacitor C11, a second filter capacitor C12, a third filter capacitor C13 and a fourth filter capacitor C14.

The first end of the first filter inductor L9 is connected to the first end of the first filter capacitor C11, the first end of the first filter inductor L9 is further connected to the fifth node N5 with the first switch module 102, the second end of the first filter inductor L9 is connected to the cathode of the first diode D1 and the first end of the second filter capacitor C12, the second end of the first filter capacitor C11, the second end of the second filter capacitor C12, the second end of the third filter capacitor C13 and the second end of the fourth filter capacitor C14 are all grounded GND, the first end of the third filter capacitor C13 is connected to the first end of the second filter inductor L10, the first end of the third filter capacitor C13 is further connected to the sixth node N6 with the third switch module 108, and the second end of the second filter inductor L10 is connected to the first end of the fourth filter capacitor C14 and the anode of the second diode D2.

In this embodiment, the first filter inductor L9, the first filter capacitor C11 and the second filter capacitor C12 form pi-type filtering. The second filter inductor L10, the third filter capacitor C13 and the fourth filter capacitor C14 form pi-type filtering.

The embodiment of the application also provides a power supply system. The power supply system includes a controller, a dc auxiliary power supply, an ac auxiliary power supply, and a power supply circuit 100 in any of the embodiments of the present application.

The power supply circuit 100 is connected to the controller, the dc auxiliary power supply and the ac auxiliary power supply, respectively, and the power supply circuit 100 is configured to output a voltage for powering the controller based on power supplied by the dc auxiliary power supply and the ac auxiliary power supply.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The utility model provides a power supply circuit, its characterized in that, power supply circuit is used for supplying power for the controller, power supply circuit still is used for being connected with direct current auxiliary power supply and alternating current auxiliary power supply respectively, wherein, direct current auxiliary power supply is used for converting direct current input power supply into direct current's first power, alternating current auxiliary power supply is used for converting alternating current input power supply into direct current's second power, power supply circuit includes:

when the power supply circuit includes the first isolated switching module,

when the power supply circuit includes the second isolated switching module,

2. The power supply circuit of claim 1, wherein the dc auxiliary power supply is further configured to convert the dc input power supply to a fifth power supply of a dc voltage polarity opposite to the first power supply;

when the power supply circuit includes the first isolated switching module,

when the power supply circuit includes the second isolated switching module,

3. The power supply circuit of claim 2, further comprising a first charge-discharge module, a second charge-discharge module, a third charge-discharge module, and a fourth charge-discharge module;

4. The power supply circuit of claim 1, wherein when the power supply circuit includes the second isolated conversion module, the power supply circuit further includes a first voltage conversion module;

5. The power supply circuit of claim 2, wherein the first isolated conversion module comprises a transformer comprising a primary winding, a first secondary winding, and a second secondary winding;

6. The power supply circuit of claim 2, wherein the second isolated switching module comprises a third secondary winding, a fourth secondary winding, a first diode, and a second diode;

And the third secondary winding and the fourth secondary winding are coupled with the same magnetic core with the primary winding in the alternating-current auxiliary power supply.

7. The power supply circuit of claim 6, wherein the second isolated switching module further comprises a first filter inductor, a second filter inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor, and a fourth filter capacitor;

8. The power supply circuit of claim 2, wherein the first, second, third, and fourth switch modules each comprise a diode;

9. The power supply circuit of claim 3, wherein the first, second, third, and fourth charge and discharge modules each comprise a capacitance;

10. A power supply system comprising a controller, a dc auxiliary power supply, an ac auxiliary power supply and a power supply circuit as claimed in any one of claims 1 to 9;