Constant power or constant current output parallel circuits, switching power supplies and electronic equipment
By using a constant power or constant current output parallel circuit, and utilizing power management chips and switching devices to achieve automatic current sharing, the problems of high power density and wide input voltage range of traditional flyback power supplies at high power output are solved, thereby improving the reliability and efficiency of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DIGITAL CORE TECHNOLOGY (SHENZHEN) CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional single flyback power supplies struggle to meet the requirements of high power density and wide input voltage range at high power output, and also find it difficult to achieve automatic current sharing.
By employing a parallel circuit with constant power or constant current output, multiple constant power or constant current output circuits are connected in parallel. Power management chips and switching devices are used to achieve automatic current sharing and constant power/constant current output, simplifying circuit design.
It improves system reliability and efficiency, simplifies circuit design, reduces energy loss, and achieves high power output while maintaining constant current or constant power characteristics.
Smart Images
Figure CN224583089U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of switching power supplies, and more particularly to a constant power or constant current output parallel circuit, a switching power supply, and electronic equipment. Background Technology
[0002] With the increasing demand for high-power, high-efficiency, and low-cost power supplies in electronic devices, traditional single-power supply topologies are no longer sufficient to meet the diverse needs of modern applications. Flyback power supplies are widely used in low-to-medium power applications due to their simple structure, low cost, and ease of control. However, when high power output is required, the power density and efficiency of a single flyback power supply are often limited, making it difficult to meet the requirements of high power density and a wide input voltage range. Summary of the Invention
[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a constant power or constant current output parallel circuit, switching power supply and electronic equipment to solve the problem that a single power supply circuit is difficult to meet the requirements of high power density and wide input voltage range.
[0004] The technical solution of this utility model is as follows:
[0005] A constant power or constant current output parallel circuit includes:
[0006] Power input terminal, used to connect to an external power source;
[0007] The power output terminal is used to connect the load.
[0008] Multiple constant power or constant current output circuits, wherein the input terminals of the multiple constant power or constant current output circuits are connected to the power input terminal, and the output terminals of the multiple constant power or constant current output circuits are connected to the power output terminal;
[0009] The constant power or constant current output circuit is used to convert the external power supply and output it to the power output terminal in a constant power manner when a constant power signal is received, or to convert the external power supply and output it to the power output terminal in a constant current manner when a constant current signal is received.
[0010] Optionally, the constant power or constant current output circuit includes:
[0011] Power management chip;
[0012] A current sensing device is connected to the power management chip. The current sensing device is used to detect the current in the constant power or constant current output circuit and output a current detection signal to the power management chip.
[0013] A switching device, wherein the controlled terminal of the switching device is connected to the output terminal of the power management chip, and the switching device is disposed between the power input terminal and the power output terminal;
[0014] The power management chip is used to control the external power supply to output a constant current to the power output terminal according to the current detection signal when a constant current signal is received, or the power management chip is used to control the external power supply to output a constant power to the power output terminal when a constant power signal is received.
[0015] Optionally, the current sensing device includes a first resistor, the switching device includes a first MOSFET, the controlled terminal of the first MOSFET is connected to the control terminal of the power management chip, the first terminal of the first resistor, the source of the first MOSFET and the input terminal of the power management chip are interconnected, and the drain of the first MOSFET is connected to the power input terminal.
[0016] Optionally, the constant power or constant current output circuit further includes:
[0017] A transformer, wherein the primary winding of the transformer is connected to the output terminal of the switching device, and the primary winding of the transformer is also connected to the power input terminal;
[0018] A rectifier and filter circuit is provided, wherein the input terminal of the rectifier and filter circuit is connected to the secondary winding of the transformer, and the output terminal of the rectifier and filter circuit is connected to the power output terminal. The rectifier and filter circuit is used to rectify and filter the external power supply output by the transformer and then output it to the power output terminal.
[0019] Optionally, the rectifier-filter circuit includes a rectifier device and a filter device. The input terminal of the rectifier device is connected to the secondary winding of the transformer, the output terminal of the rectifier device is connected to the input terminal of the filter device, and the output terminal of the filter device and the secondary winding of the transformer are connected to the power output terminal.
[0020] Optionally, the rectifier includes a rectifier MOSFET, the filter includes a first capacitor, the drain of the rectifier MOSFET is connected to the secondary winding of the transformer, the source of the rectifier MOSFET is connected to the first terminal of the first capacitor, and the second terminal of the first capacitor and the secondary winding of the transformer are connected to the power output terminal.
[0021] This utility model also proposes a switching power supply, including the constant power or constant current output parallel circuit as described above.
[0022] This invention also proposes an electronic device, including the switching power supply described above.
[0023] This utility model's technical solution constructs a parallel circuit for constant power or constant current output through a power input terminal, a power output terminal, and multiple constant power or constant current output circuits. The power input terminal connects to an external power source; the power output terminal connects to the load; the input terminals of the multiple constant power or constant current output circuits are connected to the power input terminal, and their output terminals are connected to the power output terminal. The constant power or constant current output circuits, upon receiving a constant power signal, convert the external power supply and output it as constant power to the power output terminal, or upon receiving a constant current signal, convert the external power supply and output it as constant current to the power output terminal. This parallel circuit of constant power or constant current output can increase the overall output power. Because the output current of the constant current output circuit is fixed, when multiple constant current circuits are connected in parallel, the output current of each circuit tends to be consistent, thus achieving automatic current sharing. Similarly, during constant power output, the circuit's output power is fixed; when multiple constant power circuits are connected in parallel, the output power of each circuit tends to be consistent, thus achieving automatic current sharing. This automatic current sharing feature eliminates the need for additional current sharing circuits when constant current and constant power supplies are connected in parallel, thereby simplifying the circuit design of the power supply system and improving the system's reliability and efficiency. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0025] Figure 1 This is a functional module schematic diagram of an embodiment of the constant power or constant current output parallel circuit of this utility model.
[0026] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the constant power or constant current output parallel circuit of this utility model.
[0027] Explanation of reference numerals in the attached diagram: 10, power input terminal; 20, power output terminal; 30, constant power or constant current output circuit; 31, power management chip; R1, first resistor; M1, first MOSFET; M2, rectifier MOSFET; C1, first capacitor; T, transformer. Detailed Implementation
[0028] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0029] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.
[0030] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.
[0031] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.
[0032] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0033] With the increasing demand for high-power, high-efficiency, and low-cost power supplies in electronic devices, traditional single-power supply topologies are no longer sufficient to meet the diverse needs of modern applications. Flyback power supplies are widely used in low-to-medium power applications due to their simple structure, low cost, and ease of control. However, when high power output is required, the power density and efficiency of a single flyback power supply are often limited, making it difficult to meet the requirements of high power density and a wide input voltage range.
[0034] To address the aforementioned problems, this invention proposes a parallel circuit with constant power or constant current output.
[0035] Reference Figure 1 In one embodiment, the constant power or constant current output parallel circuit includes:
[0036] Power input terminal 10 is used to connect to an external power source;
[0037] Power output terminal 20 is used to connect the load;
[0038] Multiple constant power or constant current output circuits 30, the input terminals of the multiple constant power or constant current output circuits 30 are connected to the power input terminal 10, and the output terminals of the multiple constant power or constant current output circuits 30 are connected to the power output terminal 20;
[0039] The constant power or constant current output circuit 30 is used to convert the external power supply and output it to the power output terminal 20 with constant power when a constant power signal is received, or to convert the external power supply and output it to the power output terminal 20 with constant current when a constant current signal is received.
[0040] In this embodiment, when multiple constant power or constant current output circuits 30 are used in parallel, the overall output power of the circuit can be increased without the need for a current sharing circuit. When a constant power signal is received, the constant power or constant current output circuit 30 functions as a constant power output circuit; when a constant current signal is received, it functions as a constant current output circuit. This is because the output current of the constant power or constant current output circuit 30 is fixed during constant current output and does not change with load variations. When multiple constant current output circuits are connected in parallel, the output current of each power supply is independent, but because their output characteristics are the same, the output current of each power supply tends to be consistent when connected in parallel, thus achieving automatic current sharing. Specifically, the constant current output circuit can monitor the output current through a feedback resistor and adjust the conduction time of the switching transistor to control the magnitude of the output current, thereby achieving the effect of constant current output.
[0041] The output power of a constant power output circuit is fixed. When the output voltage decreases, the output current increases to maintain a constant output power. When multiple constant power output circuits are connected in parallel, the output power of each circuit is independent. However, because their output characteristics are the same, the output power of each circuit tends to be consistent when connected in parallel, thus achieving automatic current sharing. Specifically, when the output voltage decreases, the output current increases instead, keeping the product of the two constant and maintaining a constant output power. Therefore, no additional current sharing circuit is needed when multiple constant power or constant current output circuits 30 are connected in parallel. In this embodiment, by connecting multiple constant power or constant current output circuits 30 in parallel, high power output is achieved while maintaining constant current or constant power output characteristics. Furthermore, since the output characteristics of constant current and constant power circuits are fixed, when multiple circuits are connected in parallel, the output current or power of each circuit tends to be consistent, thereby reducing the risk of overload in individual circuits, improving system reliability, reducing energy loss, and improving system efficiency.
[0042] This utility model's technical solution uses a power input terminal 10, a power output terminal 20, and multiple constant power or constant current output circuits 30 to form a parallel constant power or constant current output circuit. The power input terminal 10 is used to connect to an external power source; the power output terminal 20 is used to connect to a load; the input terminals of the multiple constant power or constant current output circuits 30 are connected to the power input terminal 10, and the output terminals of the multiple constant power or constant current output circuits 30 are connected to the power output terminal 20. The constant power or constant current output circuits 30 are used to convert the external power supply and output it as constant power to the power output terminal 20 when a constant power signal is received, or to convert the external power supply and output it as constant current to the power output terminal 20 when a constant current signal is received. This parallel circuit of constant power or constant current output can increase the overall output power. Because the output current of the constant current output circuit is fixed, when multiple constant current circuits are connected in parallel, the output current of each circuit will tend to be consistent, thereby achieving automatic current sharing. In constant power output mode, the output power of the circuit is fixed. When multiple constant power circuits are connected in parallel, the output power of each circuit tends to be consistent, thus achieving automatic current sharing. This automatic current sharing characteristic eliminates the need for additional current sharing circuits when constant current and constant power power supplies are connected in parallel, thereby simplifying the circuit design of the power supply system and improving the system's reliability and efficiency.
[0043] Reference Figure 2 In one embodiment, the constant power or constant current output circuit 30 includes:
[0044] Power management chip 31;
[0045] A current sensing device is connected to the power management chip 31. The current sensing device is used to detect the current in the constant power or constant current output circuit 30 and output a current detection signal to the power management chip 31.
[0046] A switching device, wherein the controlled terminal of the switching device is connected to the output terminal of the power management chip 31, and the switching device is disposed between the power input terminal 10 and the power output terminal 20;
[0047] The power management chip 31 is used to control the external power supply to output a constant current to the power output terminal 20 according to the current detection signal when a constant current signal is received, or the power management chip 31 is used to control the external power supply to output a constant power to the power output terminal 20 when a constant power signal is received.
[0048] In this embodiment, the power management chip 31 can receive constant current signals or constant power signals. Specifically, a constant current signal or constant power signal can be output to the power management chip 31 through an external control device. The current detection device can be one or more resistors, or other devices, to detect the current in the circuit and output a corresponding electrical signal, i.e., a current detection signal, to the power management chip 31. When the power management chip 31 receives a constant current signal, it needs to control the circuit output current to be constant. Therefore, it can determine the current value in the circuit based on the current detection signal, and then control the magnitude of the output current by adjusting the conduction time of the switching device, thereby achieving the effect of constant current output. When the power management chip 31 receives a constant power signal, it enters a constant power control mode. For example, when the output voltage decreases, it controls the output current to increase to maintain a constant output power.
[0049] Furthermore, referring to Figure 2 In one embodiment, the current sensing device includes a first resistor R1, the switching device includes a first MOSFET M1, the controlled terminal of the first MOSFET M1 is connected to the control terminal of the power management chip 31, the first terminal of the first resistor R1, the source of the first MOSFET M1 and the input terminal of the power management chip 31 are interconnected, and the drain of the first MOSFET M1 is connected to the power input terminal 10.
[0050] In this embodiment, the first resistor R1 can be used as a current sensing device, or it can be a current sensing device, a current sensor, or a shunt. The drain of the first MOSFET M1 is connected to one end of the primary winding of the transformer T. When the first MOSFET M1 is turned off, the transformer T cannot complete voltage conversion, and the secondary winding of the transformer T will not output power. Thus, by controlling the conduction or cutoff of the first MOSFET M1, it is possible to control whether external power is output to the load.
[0051] Reference Figure 2 In one embodiment, the constant power or constant current output circuit 30 further includes:
[0052] Transformer T, the primary winding of which is connected to the output terminal of the switching device, and the primary winding of which is also connected to the power input terminal 10;
[0053] A rectifier and filter circuit is provided, wherein the input terminal of the rectifier and filter circuit is connected to the secondary winding of the transformer T, and the output terminal of the rectifier and filter circuit is connected to the power output terminal 20. The rectifier and filter circuit is used to rectify and filter the external power supply output by the transformer T and then output it to the power output terminal 20.
[0054] In this embodiment, the transformer T can transform and convert the external power supply, such as stepping down the voltage before outputting it to the subsequent circuit, to prevent damage to the components in the subsequent circuit due to excessive voltage. The rectifier and filter circuit can rectify and filter the AC power, thereby enabling the load of the subsequent circuit to receive a stable operating voltage.
[0055] In one embodiment, the rectifier-filter circuit includes a rectifier device and a filter device. The input terminal of the rectifier device is connected to the secondary winding of the transformer T, the output terminal of the rectifier device is connected to the input terminal of the filter device, and the output terminal of the filter device and the secondary winding of the transformer T are connected to the power output terminal 20.
[0056] Furthermore, referring to Figure 2 In one embodiment, the rectifier device includes a rectifier MOSFET M2, the filter device includes a first capacitor C1, the drain of the rectifier MOSFET M2 is connected to the secondary winding of the transformer T, the source of the rectifier MOSFET M2 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 and the secondary winding of the transformer T are connected to the power output terminal 20.
[0057] In this embodiment, the rectifier can be a rectifier MOSFET M2. The on-resistance of the rectifier MOSFET M2 is typically lower than the forward voltage drop of a diode, meaning that in the on-state, the rectifier MOSFET M2 consumes less power, thus improving overall efficiency. Furthermore, the rectifier MOSFET M2 has a faster switching speed, making it suitable for high-frequency applications; and it has a high input impedance, effectively reducing the burden on the drive circuit. Of course, diodes or rectifier bridges can also be selected for rectification depending on the actual situation and user requirements. The filter device can be the first capacitor C1, or an RC filter circuit and an RL filter circuit can be configured according to the actual situation.
[0058] This utility model also proposes a switching power supply.
[0059] In one embodiment, the switching power supply includes a constant power or constant current output parallel circuit as described above.
[0060] It is understood that, since the above-mentioned constant power or constant current output parallel circuit is used in the switching power supply of this utility model, the embodiments of the switching power supply of this utility model include all the technical solutions of all the embodiments of the above-mentioned constant power or constant current output parallel circuit, and the technical effects achieved are exactly the same, so they will not be repeated here.
[0061] This utility model also proposes an electronic device.
[0062] In one embodiment, the electronic device includes a switching power supply as described above.
[0063] It is understood that, since the above-mentioned switching power supply is used in the electronic device of this utility model, the embodiments of the electronic device of this utility model include all the technical solutions of all the embodiments of the above-mentioned switching power supply, and the technical effects achieved are exactly the same, so they will not be repeated here.
[0064] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A constant power or constant current output parallel circuit, characterized by, include: Power input terminal, used to connect to an external power source; The power output terminal is used to connect the load. Multiple constant power or constant current output circuits, wherein the input terminals of the multiple constant power or constant current output circuits are connected to the power input terminal, and the output terminals of the multiple constant power or constant current output circuits are connected to the power output terminal; The constant power or constant current output circuit is used to convert the external power supply and output it to the power output terminal in a constant power manner when a constant power signal is received, or to convert the external power supply and output it to the power output terminal in a constant current manner when a constant current signal is received.
2. The constant power or constant current output parallel circuit of claim 1, wherein, The constant power or constant current output circuit includes: Power management chip; A current sensing device is connected to the power management chip. The current sensing device is used to detect the current in the constant power or constant current output circuit and output a current detection signal to the power management chip. A switching device, wherein the controlled terminal of the switching device is connected to the output terminal of the power management chip, and the switching device is disposed between the power input terminal and the power output terminal; The power management chip is used to control the external power supply to output a constant current to the power output terminal according to the current detection signal when a constant current signal is received, or the power management chip is used to control the external power supply to output a constant power to the power output terminal when a constant power signal is received.
3. The constant power or constant current output parallel circuit as described in claim 2, characterized in that, The current sensing device includes a first resistor, the switching device includes a first MOSFET, the controlled terminal of the first MOSFET is connected to the control terminal of the power management chip, the first terminal of the first resistor, the source of the first MOSFET and the input terminal of the power management chip are interconnected, and the drain of the first MOSFET is connected to the power input terminal.
4. The constant power or constant current output parallel circuit of claim 2, wherein, The constant power or constant current output circuit also includes: A transformer, wherein the primary winding of the transformer is connected to the output terminal of the switching device, and the primary winding of the transformer is also connected to the power input terminal; A rectifier and filter circuit is provided, wherein the input terminal of the rectifier and filter circuit is connected to the secondary winding of the transformer, and the output terminal of the rectifier and filter circuit is connected to the power output terminal. The rectifier and filter circuit is used to rectify and filter the external power supply output by the transformer and then output it to the power output terminal.
5. The constant power or constant current output parallel circuit of claim 4, wherein, The rectifier-filter circuit includes a rectifier and a filter. The input terminal of the rectifier is connected to the secondary winding of the transformer, the output terminal of the rectifier is connected to the input terminal of the filter, and the output terminal of the filter and the secondary winding of the transformer are connected to the power output terminal.
6. The constant power or constant current output parallel circuit of claim 5, wherein, The rectifier device includes a rectifier MOSFET, the filter device includes a first capacitor, the drain of the rectifier MOSFET is connected to the secondary winding of the transformer, the source of the rectifier MOSFET is connected to the first terminal of the first capacitor, and the second terminal of the first capacitor and the secondary winding of the transformer are connected to the power output terminal.
7. A switching power supply, characterized by comprising: Includes the constant power or constant current output parallel circuit as described in any one of claims 1-6.
8. An electronic device, comprising: Including the switching power supply as described in claim 7.