Power supply circuit

Abstract

The utility model relates to a power supply circuit, which comprises a rectifying circuit, a first switch, a voltage stabilizing circuit, a booster circuit, a second switch and a controller, and is characterized in that the rectifying circuit, the first switch and the voltage stabilizing circuit are sequentially connected in series between an external alternating current power supply and electric equipment; the booster circuit and the second switch are sequentially connected in series between the renewable energy source conversion device and the voltage stabilizing circuit; the controller is connected with the first switch and the second switch. The booster circuit is arranged, and the booster circuit and the rectifying circuit share the same voltage stabilizing circuit, so that the circuit structure is simplified, and the cost can be further reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply circuit. Background Art

[0002] Based on the development of renewable energy systems, in multiple application scenarios, in addition to power supply from the power grid, renewable energy systems will also be used as a power source to power electrical equipment, realizing multi-power supply.

[0003] Among them, the power supply circuit of the power supply network is mainly equipped with a rectifier circuit and a voltage stabilization circuit. The rectifier circuit converts AC power into DC power and then stabilizes the voltage, and then provides DC working voltage for the power-consuming equipment. Renewable energy systems often provide power to power-consuming equipment by setting up circuits such as inverters. Under this multi-power supply architecture, the circuit structure is complex and the cost is high. Utility Model Content

[0004] The technical problem solved by the present application is to provide a power supply circuit which can effectively simplify the circuit structure and thus reduce the cost.

[0005] The above technical problems are solved by the following technical solutions:

[0006] The embodiment of the present application provides a power supply circuit, including: a rectifier circuit, a first switch, a voltage stabilizing circuit, a voltage boosting circuit, a second switch and a controller;

[0007] The rectifier circuit, the first switch and the input end of the voltage stabilizing circuit are connected in series in sequence, and the output end of the voltage stabilizing circuit is used to connect to the electrical equipment;

[0008] The output end of the boost circuit, the second switch and the input end of the voltage stabilizing circuit are sequentially connected in series, and the input end of the boost circuit is used to connect to the renewable energy conversion device;

[0009] The controller is connected to the first switch and the second switch respectively.

[0010] The power supply circuit provided in the embodiment of the present application, the rectifier circuit, the first switch and the voltage stabilizing circuit serve as an AC-DC conversion circuit, which converts the AC power of the external AC power source into DC power to provide a working voltage to the power-consuming equipment. The renewable energy conversion device serves as another energy supply, and the DC power output by the renewable energy conversion device is boosted by the boost circuit to the working voltage of the power-consuming equipment. To improve the power supply stability, the boost circuit is connected to the voltage stabilizing circuit via the second switch, and after being stabilized by the voltage stabilizing circuit, a stable working voltage is provided to the power-consuming equipment, wherein different power supplies can be switched by the first switch and the second switch. The power supply circuit provided in the present embodiment can simplify the circuit structure and thus reduce the cost by directly replacing the inverter with the boost circuit, and the boost circuit and the rectifier circuit share a voltage stabilizing circuit.

[0011] In one embodiment, the power supply circuit further includes:

[0012] A first detection circuit is connected to the output end of the rectifier circuit and the controller respectively, and is used to collect the output power of the rectifier circuit;

[0013] The second detection circuit is connected to the output end of the boost circuit and the controller respectively, and is used to collect the output power of the boost circuit.

[0014] The power supply circuit provided in the embodiment of the present application collects the output power of the rectifier circuit through the first detection circuit and collects the output power of the boost circuit through the second detection circuit to understand the voltage level that the two power sources of the external AC power supply and the renewable energy conversion device can provide to the power-consuming device. The on-off state of the first switch and the second switch can be switched, and based on the output power levels collected by the two detection circuits, one is selected to power the power-consuming device. When the output power of the boost circuit is greater than or equal to the maximum power required by the power-consuming device, it means that the electric energy output by the renewable energy conversion device at this time can fully bear the power demand of the power-consuming device. At this time, the first switch is disconnected and the second switch is closed. When the output power of the boost circuit is less than the maximum power required by the power-consuming device and greater than the minimum power required by the power-consuming device, it means that the renewable energy conversion device can provide a part of the working voltage for the power-consuming device, but does not fully meet its power demand. At this time, the first switch and the second switch are both closed, and the external AC power supply and the renewable energy conversion device simultaneously power the power-consuming device, and the energy consumption of the external AC power supply can be reduced. When the output power of the boost circuit is less than the minimum power required by the electrical equipment, the second switch is disconnected and the first switch is closed. At this time, it means that the renewable energy conversion device cannot provide the working voltage for the electrical equipment. At this time, it is only powered by the external AC power supply to meet the power demand of the electrical equipment. The power supply circuit provided in the embodiment of the present application detects the power input to the voltage stabilizing circuit by the external AC power supply and the renewable energy conversion device. When the power demand of the electrical equipment is met, the energy provided by the renewable energy conversion device can be consumed preferentially, thereby reducing the energy consumption of the non-renewable external AC power supply. Improve environmental protection and energy saving effects.

[0015] In one embodiment, the first detection circuit includes:

[0016] A first voltage sampling circuit is connected to the rectifier circuit and the controller respectively, and is used to collect the voltage output by the rectifier circuit;

[0017] The first current sampling circuit is connected to the rectifier circuit and the controller respectively, and is used to collect the current output by the rectifier circuit.

[0018] The power supply circuit provided in the embodiment of the present application adopts a first voltage sampling circuit and a first current sampling circuit to respectively collect the output voltage and the output current of the rectifier circuit, so as to determine the output power of the rectifier circuit and provide a basis for the on-off switching of the first switch and the second switch.

[0019] In one embodiment, the second detection circuit includes:

[0020] A second voltage sampling circuit is connected to the boost circuit and the controller respectively, and is used to collect the voltage output by the boost circuit;

[0021] The second current sampling circuit is connected to the boost circuit and the controller respectively, and is used to collect the current output by the boost circuit.

[0022] The power supply circuit provided in the embodiment of the present application adopts a second voltage sampling circuit and a second current sampling circuit to respectively collect the output voltage and the output current of the boost circuit, thereby determining the output power of the boost circuit and providing a basis for the on-off switching of the first switch and the second switch.

[0023] In one embodiment, the voltage boosting circuit is a boost circuit.

[0024] By adopting a boost circuit, the volume and cost of the power supply circuit can be further reduced based on the characteristics of the boost circuit, which has a simple structure, small size, and high cost performance.

[0025] In one embodiment, the power supply circuit further includes:

[0026] A filter is provided, wherein the output end of the filter is connected to the input end of the rectifier circuit.

[0027] The power supply circuit provided in the embodiment of the present application can purify the electrical signal connected to the rectifier circuit by connecting a filter in series between the external AC power supply and the rectifier circuit to ensure that the electrical equipment works normally and stably.

[0028] In one embodiment, the filter is an electromagnetic compatibility filter.

[0029] Electromagnetic compatibility filters can effectively reduce or attenuate all harmful noise signals that are about to enter the rectifier circuit to ensure the normal operation of electrical equipment.

[0030] In one of the embodiments, the power supply circuit further includes: at least one of a first fuse and a second fuse;

[0031] The first fuse is connected in series between the renewable energy conversion device and the boost circuit;

[0032] The second fuse is connected to the input end of the filter.

[0033] The first fuse can disconnect the renewable energy conversion device and the boost circuit when overloaded, and the second fuse can disconnect the external AC power supply and the filter when overloaded. Based on this overload protection mechanism, it can ensure that the components in the boost circuit, the second switch, the filter, the rectifier circuit, the first switch, the voltage stabilization circuit and the electrical equipment are not damaged when overloaded.

[0034] In one embodiment, at least one of the first switch and the second switch is a transistor.

[0035] By using transistors as switches, the switching speed is fast and the efficiency is high. In addition, transistors have the characteristics of small size, which can further reduce the overall size of the power supply circuit.

[0036] In one embodiment, the renewable energy conversion device is a solar panel.

[0037] Solar panels can continuously convert solar energy into direct current, and solar panels have low requirements for the installation environment, which is conducive to the widespread application of power supply circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is one of the structural schematic diagrams of a power supply circuit of an embodiment;

[0040] Figure 2 This is a second structural schematic diagram of a power supply circuit according to an embodiment;

[0041] Figure 3 This is a third structural schematic diagram of a power supply circuit of an embodiment;

[0042] Figure 4 This is a fourth structural schematic diagram of a power supply circuit of an embodiment;

[0043] Figure 5 This is a fifth structural diagram of a power supply circuit of an embodiment;

[0044] Figure 6a for Figure 5 A schematic diagram of the circuit structure between the external AC power supply and the voltage stabilizing circuit, i.e., a partial enlarged view of area B;

[0045] Figure 6b for Figure 5A schematic diagram of the circuit structure between the renewable energy conversion device and the voltage stabilization circuit, i.e., a partial enlarged diagram of the A area;

[0046] Figure 6c for Figure 5 The schematic diagram of the structure of the medium voltage stabilization circuit, i.e., the partial enlarged diagram of the C area;

[0047] Figure 6d for Figure 5 Schematic diagram of the controller structure.

[0048] Description of reference numerals:

[0049] 10. Power supply circuit; 11. Rectification circuit; 12. First switch; 13. Voltage stabilization circuit; 14. Boost circuit; 15. Second switch; 16. Controller; 17. First detection circuit; 171. First voltage sampling circuit; 172. First current sampling circuit; 18. Second detection circuit; 181. Second voltage sampling circuit; 182. Second current sampling circuit; 19. Filter; 20. External AC power supply; 30. Electrical equipment; 40. Renewable energy conversion device. DETAILED DESCRIPTION

[0050] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0052] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first switch may be referred to as a second switch, and similarly, a second switch may be referred to as a first switch. Both the first switch and the second switch are switches, but they are not the same switch.

[0053] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0054] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0055] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0056] The present application embodiment provides a power supply circuit 10, such as Figure 1 As shown, it includes: a rectifier circuit 11, a first switch 12, a voltage stabilizing circuit 13, a boost circuit 14, a second switch 15 and a controller 16.

[0057] The rectifier circuit 11, the first switch 12 and the voltage stabilizing circuit 13 are sequentially connected in series between the external AC power source 20 and the power-consuming device 30. The AC voltage provided by the external AC power source 20 can be converted into a DC voltage and stably output to the power-consuming device 30 to ensure the normal operation of the power-consuming device 30.

[0058] The boost circuit 14 and the second switch 15 are connected in series between the renewable energy conversion device 40 and the voltage stabilizing circuit 13. The renewable energy conversion device 40 is used to convert renewable energy into direct current, and the boost circuit 14 converts the direct current output by the renewable energy conversion device 40 into direct current adapted to the working voltage requirement of the electrical equipment 30, and supplies it to the electrical equipment 30 when the second switch 15 is closed.

[0059] Combined with Figure 1 As can be seen from the above description, the power supply circuit 10 provided in the embodiment of the present application provides two types of power supply circuits, one is a power supply path starting from the external AC power supply 20, sequentially passing through the rectifier circuit 11, the first switch 12 and the voltage stabilizing circuit 13, and the other is a power supply path starting from the renewable energy conversion device 40, sequentially passing through the boost voltage, the second switch 15 and the voltage stabilizing circuit 13. The controller 16 is connected to the first switch 12 and the second switch 15 respectively. By controlling the on and off states of the first switch 12 and the second switch 15, at least one of the renewable energy conversion device 40 and the external AC power supply 20 can supply power to the electrical device 30.

[0060] Specifically, the power supply circuit 10 provided in the embodiment of the present application, the rectifier circuit 11, the first switch 12 and the voltage stabilizing circuit 13 serve as an AC-DC conversion circuit to convert the AC power of the external AC power supply 20 into DC power to provide a working voltage to the electrical equipment 30. The renewable energy conversion device 40 serves as another energy supply, and boosts the DC power output by the renewable energy conversion device 40 through the boost circuit 14 to the working voltage of the electrical equipment 30. In order to improve the power supply stability, the boost circuit 14 is connected to the voltage stabilizing circuit 13 via the second switch 15. After being stabilized by the voltage stabilizing circuit 13, a stable working voltage is provided to the electrical equipment 30. The power supply circuit 10 provided in the present embodiment does not need to set an inverter or other circuits in the loop in which the renewable energy conversion device 40 supplies power to the electrical equipment 30, and by sharing a voltage stabilizing circuit 13 with the rectifier circuit 11, the circuit structure is simplified, thereby reducing costs.

[0061] In one embodiment, if Figure 2 As shown, the power supply circuit 10 further includes: a first detection circuit 17 and a second detection circuit 18 .

[0062] The first detection circuit 17 is connected to the output end of the rectifier circuit 11 and the controller 16 respectively, and is used to collect the output power of the rectifier circuit 11. The second detection circuit 18 is connected to the output end of the boost circuit 14 and the controller 16 respectively, and is used to collect the output power of the boost circuit 14.

[0063] The selection of the first detection circuit 17 and the second detection circuit 18 can be determined based on application scenarios, cost, size, and other considerations. For example, the first detection circuit 17 and the second detection circuit 18 can both use power collectors to collect the output power of the rectifier circuit 11 and the boost circuit 14, respectively. Optionally, multiple power collectors can also be integrated together to form a multi-channel isolated power collection device, and multiple channels collect the output power of the rectifier circuit 11 and the boost circuit 14, respectively. Of course, the implementation method of power collection by the first detection circuit 17 and the second detection circuit 18 is not limited to the examples given here, and can also be the method described in the following embodiments, or other collection methods, as long as the output power collection can be achieved.

[0064] Specifically, the power supply circuit 10 provided in the embodiment of the present application collects the output power of the rectifier circuit 11 through the first detection circuit 17, and collects the output power of the boost circuit 14 through the second detection circuit 18, so as to understand the voltage level that the two power supply sources, the external AC power supply 20 and the renewable energy conversion device 40, can provide to the power-consuming device 30, and can select one to supply power to the power-consuming device 30 based on the output power levels collected by the two detection circuits (17 and 18) by switching the on-off state of the first switch 12 and the second switch 15. When the output power of the boost circuit 14 is greater than or equal to the maximum power required by the power-consuming device 30, it means that the electric energy output by the renewable energy conversion device 40 at this time can fully bear the power demand of the power-consuming device 30, and at this time, the controller 16 controls the first switch 12 to be disconnected and the second switch 15 to be closed. When the output power of the boost circuit 14 is less than the maximum power required by the power device 30 and greater than the minimum power required by the power device 30, it means that the renewable energy conversion device 40 can provide a part of the working voltage for the power device 30, but cannot fully meet its power demand. At this time, the controller 16 controls both the first switch 12 and the second switch 15 to be closed, and the external AC power source 20 and the renewable energy conversion device 40 simultaneously supply power to the power device 30, and the energy consumption of the external AC power source 20 can be reduced. When the output power of the boost circuit 14 is less than the minimum power required by the power device 30, the controller 16 controls the second switch 15 to be disconnected and the first switch 12 to be closed. At this time, it means that the renewable energy conversion device 40 cannot provide the working voltage for the power device 30. At this time, only the external AC power source 20 supplies power to meet the power demand of the power device 30. The power supply circuit 10 provided in the embodiment of the present application can detect the power input to the voltage stabilizing circuit 13 by the external AC power source 20 and the renewable energy conversion device 40, and can preferentially consume the energy provided by the renewable energy conversion device 40 while meeting the power demand of the power-consuming device 30, thereby reducing the energy consumption of the non-renewable external AC power source 20, thereby improving the environmental protection and energy-saving effect.

[0065] Among them, the controller 16 controls the on-off of the first switch 12 and the second switch 15 based on the output power of the rectifier circuit 11 and the boost circuit 14, which can be implemented by using devices such as comparators. In addition, when the controller 16 is a single-chip microcomputer, the on-off control of the first switch 12 and the second switch 15 can also be performed based on an existing data comparison program. That is, the power supply circuit 10 provided in the embodiment of the present application relies on hardware structure improvements to solve the technical problems, and does not involve method improvements.

[0066] Taking the controller 16 including an analog-to-digital conversion circuit, a digital comparator and a digital-to-analog conversion circuit as an example, the two input ends of the analog-to-digital conversion circuit are respectively connected to the first detection circuit 17 and the second detection circuit 18. The analog-to-digital conversion circuit is used to convert the input power signal into a digital signal and input it to the two input ends of the digital comparator. The digital comparator is a multi-segment comparator, which stores digital reference values ​​corresponding to the maximum power and minimum power required by the electrical device 30. The digital comparator can compare the output power of the boost circuit 14 and the maximum power and minimum power required by the electrical device 30, and output a digital signal accordingly. The digital signal is output through the digital-to-analog conversion circuit, and an analog signal is output to the first switch 12 and the second switch 15 to trigger the first switch 12 and the second switch 15 to turn on and off.

[0067] In an example solution, the input and output of the digital comparator conform to the mapping relationship in the following relationship table:

[0068]

[0069] When POmax≥PImax, it means that the power generation of the renewable energy conversion device 40 is greater than the power consumption of the electrical equipment 30. At this time, the digital comparator can output a 01 signal to the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit outputs high and low level signals to the first switch 12 and the second switch 15 respectively, triggering the first switch 12 to be disconnected and the second switch 15 to be turned on, and all the energy is output by the renewable energy conversion device 40 (such as a solar panel, etc.). When PImin≤POmax<PImax, the power generation of the renewable energy conversion device 40 is not enough to maintain the full power operation of the electrical equipment 30. At this time, the two output ends of the digital comparator can output a 11 signal to the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit outputs two high level signals to the first switch 12 and the second switch 15 respectively, triggering the first switch 12 and the second switch 15 to be turned on, and the renewable energy conversion device 40 and the external AC power supply 20 jointly output energy to supply power to the electrical equipment 30. When POmax<PImin, the power generation of the renewable energy conversion device 40 is insufficient to maintain the operation of the electrical equipment 30. At this time, the two output ends of the digital comparator output 10 signals to the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit outputs low and high level signals to the first switch 12 and the second switch 15 respectively, triggering the first switch 12 to turn on and the second switch 15 to turn off, so that energy is output by the external AC power supply 20.

[0070] In one embodiment, the controller 16 is model CMS80F262B.

[0071] In one embodiment, if Figure 3 As shown, the first detection circuit 17 includes: a first voltage sampling circuit 171 and a first current sampling circuit 172 .

[0072] The first voltage sampling circuit 171 is connected to the rectifier circuit 11 and the controller 16 respectively, and is used to collect the voltage output by the rectifier circuit 11. The first current sampling circuit 172 is connected to the rectifier circuit 11 and the controller 16 respectively, and is used to collect the current output by the rectifier circuit 11.

[0073] The power supply circuit 10 provided in the embodiment of the present application adopts the first voltage sampling circuit 171 and the first current sampling circuit 172 to respectively collect the output voltage and the output current of the rectifier circuit 11, so as to determine the output power of the rectifier circuit 11 and provide a basis for the on-off switching of the first switch 12 and the second switch 15.

[0074] In one embodiment, if Figure 4 As shown, the second detection circuit 18 includes: a second voltage sampling circuit 181 and a second current sampling circuit 182 .

[0075] The second voltage sampling circuit 181 is connected to the boost circuit 14 and the controller 16 respectively, and is used to collect the voltage output by the boost circuit 14. The second current sampling circuit 182 is connected to the boost circuit 14 and the controller 16 respectively, and is used to collect the current output by the boost circuit 14.

[0076] The power supply circuit 10 provided in the embodiment of the present application can determine the output power of the boost circuit 14 by adopting the second voltage sampling circuit 181 and the second current sampling circuit 182 to respectively collect the output voltage and the output current of the boost circuit 14, thereby providing a basis for the on-off switching of the first switch 12 and the second switch 15.

[0077] There may be various circuit structures of the first current sampling circuit 172 and the first voltage sampling circuit 171 in the embodiment of the present application. Figure 5 The circuit structure shown is taken as an example for explanation.

[0078] In one embodiment, the first voltage sampling circuit 171 may include: a plurality of voltage-dividing resistors connected in series, and a current-limiting resistor, wherein the plurality of voltage-dividing resistors are connected in parallel between two output ends (between the positive and negative poles) of the rectifier circuit 11, one end of the current-limiting resistor is connected to a connection point between two of the voltage-dividing resistors, and the other end of the current-limiting resistor is connected to the controller 16 to output the collected voltage to the controller 16.

[0079] For example, the voltage dividing resistor in the second voltage sampling circuit 181 may include Figure 5The resistors R9, R13, and R18 shown in the figure, and one end of the current limiting resistor R16 are connected to the resistors R13 and R18 respectively. The current input to the controller 16 through the resistor R16 can reflect the current in the series branch where the resistors R9, R13, and R18 are located. Since the resistance values ​​of these resistors are known, the output voltage of the rectifier circuit 11 can be determined, thereby realizing voltage collection.

[0080] In one embodiment, the first current sampling circuit 172 may include a sampling resistor R17, which is connected in series between the output end of the rectifier circuit 11 and the ground. One end CUR2 of the sampling resistor R17 connected to the rectifier circuit 11 is also connected to the pin CUR2 of the controller 16 to transmit the output current sampling result of the rectifier circuit 11 to the controller 16.

[0081] There may be various circuit structures of the second current sampling circuit 182 and the second voltage sampling circuit 181 in the embodiment of the present application. Figure 5 The circuit structure shown is taken as an example for explanation.

[0082] In one embodiment, the second voltage sampling circuit 181 may include: a plurality of voltage-dividing resistors connected in series, and a current-limiting resistor, wherein the plurality of voltage-dividing resistors are connected in parallel between two output ends (between positive and negative electrodes) of the boost circuit 14, one end of the current-limiting resistor is connected to a connection point between two of the voltage-dividing resistors, and the other end of the current-limiting resistor is connected to the controller 16, so as to transmit the collected output voltage of the boost circuit 14 to the controller 16.

[0083] For example, the voltage dividing resistor in the second voltage sampling circuit 181 may include Figure 5 The resistors R1, R3, R5 and R7 shown in the figure, and one end of the current limiting resistor R6 are connected to the resistors R5 and R7 respectively. The current input to the controller 16 through the resistor R6 can reflect the current in the series branch where the resistors R1, R3, R5 and R7 are located. Since the resistance values ​​of these resistors are known, the output voltage of the boost circuit 14 can be determined.

[0084] In one embodiment, the second current sampling circuit 182 may include a sampling resistor R8, which is connected in series between an output terminal of the boost circuit 14 and the ground. An end CUR1 of the sampling resistor R8 connected to the boost circuit 14 is also connected to a pin CUR1 of the controller 16 to transmit the output current sampling result of the boost circuit 14 to the controller 16.

[0085] In one embodiment, the controller 16 may include an analog-to-digital conversion circuit (not shown) to convert analog signals collected by the first voltage sampling circuit 171 , the first current sampling circuit 172 , the second voltage sampling circuit 181 , and the second current sampling circuit 182 into digital signals.

[0086] In one embodiment, the boost circuit 14 is a boost circuit. By adopting the boost circuit, the volume and cost of the power supply circuit 10 can be further reduced based on the characteristics of the boost circuit, which is simple in structure, small in size, and high in cost performance.

[0087] In one embodiment, Figure 5 and Figure 6b As shown, the boost circuit 14 may include:

[0088] An inductor L1, an input end of the inductor L1 is connected to a positive output end of the renewable energy conversion device 40;

[0089] A diode D1, wherein an anode of the diode D1 is connected to the output end of the inductor L1, and a cathode of the diode D1 is connected to the input end of the second switch 15;

[0090] The switch tube Q2 has a drain connected to the output end of the inductor L1 , a source connected to the negative output end of the renewable energy conversion device 40 , and a gate connected to the PWM1 pin of the controller 16 .

[0091] The controller 16 provides a pulse modulation signal to the switch tube Q2 via the pin PWM1, and boosts the voltage output by the renewable energy conversion device 40 by controlling the on and off of the switch tube Q2. The boosted output voltage is transmitted to the input end of the second switch 15.

[0092] In one embodiment, the power supply circuit 10 further includes a filter 19 . The filter 19 is connected in series between the external AC power source 20 and the rectifier circuit 11 .

[0093] The power supply circuit 10 provided in the embodiment of the present application can purify the electrical signal connected to the rectifier circuit 11 by connecting a filter 19 in series between the external AC power supply 20 and the rectifier circuit 11 to ensure that the electrical equipment 30 works normally and stably.

[0094] In one embodiment, the filter 19 is an electromagnetic compatibility filter 19 .

[0095] The electromagnetic compatibility filter 19 can effectively reduce or attenuate all harmful noise signals that are about to enter the rectifier circuit 11 to ensure the normal operation of the electrical equipment 30 .

[0096] In one embodiment, the filter 19 may be a multi-stage filter. For example, it may include: Figure 5The specific circuit shown in the figure realizes EMC (Electromagnetic Compatibility) filtering by using components such as varistors, capacitors and common mode coils. The filtering implementation process will not be described in detail here.

[0097] In one embodiment, the power supply circuit 10 further includes: at least one of a first fuse F1 and a second fuse F2.

[0098] The first fuse F1 is connected in series between the renewable energy conversion device 40 and the boost circuit 14 , and the second fuse F2 is connected in series between the external AC power source 20 and the filter 19 .

[0099] The first fuse F1 can disconnect the renewable energy conversion device 40 and the boost circuit 14 when overloaded, and the second fuse F2 can disconnect the external AC power source 20 and the filter 19 when overloaded. Based on this overload protection mechanism, it can be ensured that the components in the boost circuit 14, the second switch 15, the filter 19, the rectifier circuit 11, the first switch 12, the voltage stabilizing circuit 13 and the electrical equipment 30 are not damaged when overloaded.

[0100] In one embodiment, at least one of the first switch 12 and the second switch 15 is a transistor.

[0101] By using a transistor as a switch, the switch has a fast on-off speed and high efficiency. In addition, the transistor has a small volume, which can further reduce the overall volume of the power supply circuit 10.

[0102] In one embodiment, the controller 16 may be a microcontroller 16, for example, a microcontroller 16 of model CMS80F262B. The connection between the controller 16 and each device may be made through a resistor or the like to avoid damage to the device caused by a sudden change in current, thereby increasing the service life of the controller 16. Figure 5 As shown in , the PWM1 pin of the controller 16 is connected to the gate of the switch tube Q2 in the boost circuit 14 through a resistor R2. For another example, the PWM2 pin of the controller 16 is connected to the gate of the second switch 15 (Q1) through a resistor R4. The PWM3 pin of the controller 16 is connected to the gate of the first switch 12 (Q3) through a resistor R12.

[0103] In one embodiment, the voltage stabilizing circuit 13 may include a plurality of capacitors connected in parallel. For example, a plurality of capacitors connected in parallel may be included to stabilize the voltage output to the power-consuming device 30. Some of the plurality of capacitors connected in parallel in the voltage stabilizing circuit 13 may be electrolytic capacitors.

[0104] In one embodiment, the renewable energy conversion device 40 is a solar panel.

[0105] The solar panel can continuously convert solar energy into direct current, and the solar panel has low requirements for the installation environment, which is conducive to the wide application of the power supply circuit 10. Optionally, the solar panel can provide a direct current voltage of 9-48V.

[0106] The renewable energy conversion device 40 may also be a device other than a solar panel, for example, a wind energy conversion device, which can convert wind energy into electrical energy, and then boost the voltage through the boost circuit 14 to supply power to the electrical device 30. It may also be a hydroelectric device, which converts the mechanical energy of water into electrical energy, and then boosts the voltage through the boost circuit 14 to supply power to the electrical device 30. The types of renewable energy conversion devices 40 are not exhaustively listed here.

[0107] In order to better illustrate the working process of the power supply circuit 10 provided in the embodiment of the present application, Figure 5 The specific circuit shown is used as an example for explanation, but the example here does not limit the protection scope of this application. Figure 6a-6d From the local enlarged view in the figure, we can see that:

[0108] When the solar panel is working, it outputs a PVS signal to the controller 16, and the controller 16 starts working. The controller 16 outputs a pulse modulation signal to the PWM1 pin to drive the switch tube Q2 to be turned on and off, so that the voltage output by the solar panel is boosted, filtered by the filter capacitor C1, and transmitted to the second switch 15 (Q1) to prepare for power supply.

[0109] The output current signal of the boost circuit 14 can be transmitted to the CUR1 pin of the controller 16 via the resistor R8, and the output voltage signal of the boost circuit 14 collected by the second voltage sampling circuit 181 can be transmitted to the VOLT1 pin of the controller 16 via R6, providing a basis for the controller 16 to control the on and off of the first switch 12 and the second switch 15.

[0110] In another power supply circuit, the AC power provided by the external AC power source 20 is filtered by the electromagnetic compatibility filter 19 and transmitted to the input end of the rectifier circuit 11, and is converted into a DC signal by the rectifier circuit 11. The DC signal is transmitted to the input end of the first switch 12 (Q3) through the filter capacitor C2 to prepare for power supply.

[0111] At the same time, the output current signal of the rectifier circuit 11 can be collected to the CUR2 pin of the controller 16 through the resistor R17, and the output voltage signal of the boost circuit 14 can be transmitted to the VOLT2 pin of the controller 16 through the resistor R16, providing a basis for the controller 16 to control the on and off of the first switch 12 and the second switch 15.

[0112] The controller 16 can obtain the output power of the boost circuit 14 based on the output voltage and output current of the boost circuit 14. The controller 16 can also obtain the output power of the rectifier circuit 11 based on the output voltage and output current of the rectifier circuit 11. On the one hand, the controller 16 can control the on and off of the first switch 12 and the second switch 15 according to the magnitude relationship between the output power of the boost circuit 14 and the maximum power and minimum power required by the electrical device 30. On the other hand, the controller 16 can control the duty cycle of each switch tube in the rectifier circuit 11 according to the output power of the rectifier circuit 11 to adjust the output voltage to match the power demand of the electrical device 30.

[0113] Specifically, the controller 16 can control the second switch 15 to be turned on and the first switch 12 to be turned off when POmax≥PImax, and the solar panel supplies power; when PImin≤POmax<PImax, the controller 16 can control the first switch 12 and the second switch 15 to be turned on, and the solar panel and the external AC power supply 20 can jointly supply power to the electrical equipment 30; when POmax<PImin, the controller 16 can control the first switch 12 to be turned on and the second switch 15 to be turned off, and the external AC power supply 20 can supply power to the electrical equipment 30.

[0114] In one embodiment, the voltage stabilizing circuit 13 can provide a 310V DC voltage to the electrical device 30. Of course, depending on the electrical device 30, the voltage output by the boost circuit 14, the rectifier circuit 11 and the voltage stabilizing circuit 13 are also different, and the selection is based on the principle of being able to meet the power demand of the electrical device 30.

[0115] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0116] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A power supply circuit, characterized in that: include: A rectifier circuit (11), a first switch (12), a voltage stabilization circuit (13), a voltage boost circuit (14), a second switch (15) and a controller (16); The rectifier circuit (11), the first switch (12) and the input end of the voltage stabilizing circuit (13) are connected in series in sequence, and the output end of the voltage stabilizing circuit (13) is used to connect to an electrical device (30); The output end of the boost circuit (14), the second switch (15), and the input end of the voltage stabilizing circuit (13) are sequentially connected in series, and the input end of the boost circuit (14) is used to connect to a renewable energy conversion device (40); The controller (16) is connected to the first switch (12) and the second switch (15) respectively.

2. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: A first detection circuit (17) connected to the output end of the rectifier circuit (11) and the controller (16) respectively, and used for collecting the output power of the rectifier circuit (11); The second detection circuit (18) is connected to the output end of the boost circuit (14) and the controller (16) respectively, and is used to collect the output power of the boost circuit (14).

3. The power supply circuit according to claim 2, characterized in that: The first detection circuit (17) comprises: A first voltage sampling circuit (171) connected to the rectifier circuit (11) and the controller (16) respectively, and used for collecting the voltage output by the rectifier circuit (11); A first current sampling circuit (172) is connected to the rectifier circuit (11) and the controller (16) respectively, and is used to collect the current output by the rectifier circuit (11).

4. The power supply circuit according to claim 2 or 3, characterized in that: The second detection circuit (18) comprises: A second voltage sampling circuit (181) connected to the boost circuit (14) and the controller (16) respectively, and used for collecting the voltage output by the boost circuit (14); The second current sampling circuit (182) is connected to the boost circuit (14) and the controller (16) respectively, and is used to collect the current output by the boost circuit (14).

5. The power supply circuit according to claim 1, characterized in that: The voltage boost circuit (14) adopts a boost circuit.

6. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: A filter (19), wherein an output end of the filter (19) is connected to an input end of the rectifier circuit (11).

7. The power supply circuit according to claim 6, characterized in that: The filter (19) is an electromagnetic compatibility filter.

8. The power supply circuit according to claim 6, characterized in that: The power supply circuit further includes: at least one of a first fuse F1 and a second fuse F2; The first fuse F1 is connected in series between the renewable energy conversion device (40) and the boost circuit (14); The second fuse F2 is connected to the input end of the filter (19).

9. The power supply circuit according to claim 1, characterized in that: At least one of the first switch (12) and the second switch (15) is a transistor.

10. The power supply circuit according to claim 1, characterized in that: The renewable energy conversion device (40) is a solar panel.

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