Power supply device and power supply system
By introducing a current sampling module and a feedback control module into the power supply system, automatic adjustment and current sharing of multiple power supply devices are realized, solving the problem of the need for additional control equipment in traditional power supply systems and improving the stability and reliability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-04-14
AI Technical Summary
In traditional power systems, multiple parallel power modules require additional control equipment, which reduces reliability.
By employing a current sampling module and a feedback control module, automatic adjustment based on average current is achieved. Current sharing can be realized without communication between power supply devices. Automatic adjustment is performed within each power supply device through the current sampling module and the feedback control module to avoid output inconsistency.
This improves the stability and reliability of the power supply system and avoids output inconsistencies caused by communication disruptions.
Smart Images
Figure CN224124040U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of power supply circuit technology, and in particular relates to power supply devices and power supply systems. Background Technology
[0002] Currently, in traditional power systems, if there are multiple power modules connected in parallel, additional control equipment is usually required to control each power module. Some power systems also require remote communication between control equipment, which leads to a decrease in the reliability of the power system. Utility Model Content
[0003] The purpose of this application is to provide a power supply device and power supply system that aims to solve the problem of traditional power supply systems requiring additional control equipment.
[0004] A first aspect of this application provides a power supply device, comprising: a power converter for converting an input voltage into an output voltage, the power converter having a current sampling terminal for outputting an output sampling current; a current sampling module, a first input terminal of the current sampling module being connected to the current sampling terminal of the power converter, and a second input terminal of the current sampling module being connected to the current sampling terminals of other power converters; the current sampling module being used to acquire the average current of each received output sampling current; and a feedback control module, the feedback control module being connected to both the current sampling module and the power converter, for obtaining a voltage deviation signal based on the difference between the output sampling current and the average current and the output voltage; the power converter further being used to adjust the output voltage based on the voltage deviation signal.
[0005] In one embodiment, the feedback control module includes a current sharing loop control module and a voltage control module. The input terminal of the current sharing loop control module is connected to the current sampling module and the current sampling terminal of the power converter, and the output terminal of the current sharing loop control module is connected to the voltage control module. The current sharing loop control module is used to obtain and output a current deviation signal based on the difference between the output sampled current and the average current. The voltage control module is connected to the power converter and is used to obtain and output a voltage deviation signal based on the current deviation signal, the output voltage, and the reference voltage. The voltage deviation signal is positively correlated with the current deviation signal and negatively correlated with the output voltage.
[0006] In one embodiment, the voltage control module includes a voltage sampling unit, a calculation unit, and a reference voltage unit; the voltage sampling unit is connected to the output terminal of the power converter and the calculation unit respectively, and the voltage sampling unit is used to sample the output voltage to obtain a sampled voltage; the reference voltage unit is connected to the calculation unit and is used to provide the reference voltage; the calculation unit is used to add the current deviation signal to the reference voltage and then subtract the sampled voltage to obtain a voltage deviation signal.
[0007] In one embodiment, the power converter includes a signal processing unit, a pulse width modulation unit, and a power converter. The signal processing unit is connected to both the computing unit and the pulse width modulation unit. The signal processing unit is used to obtain and output a periodic feedback signal based on the voltage deviation signal, the frequency of which is negatively correlated with the voltage deviation signal. The pulse width modulation unit is also connected to the power converter and is used to generate and output a pulse width modulation signal based on the periodic feedback signal. The power converter is used to convert the input voltage into the output voltage based on the pulse width modulation signal.
[0008] In one embodiment, the signal processing unit includes a first voltage loop controller and a second voltage loop controller; the first voltage loop controller and the second voltage loop controller are respectively connected to the calculation unit and the current sampling terminal; the first voltage loop controller is used to output the periodic feedback signal when the output sampling current is greater than a preset threshold, and the second voltage loop controller is used to output the periodic feedback signal when the output sampling current is less than the preset threshold.
[0009] In one embodiment, the power converter includes a half-bridge LLC resonant converter.
[0010] In one embodiment, the current sampling module includes a switching unit, an amplification unit, a filtering unit, and a clamping unit; the input terminal of the amplification unit is connected to the current sampling terminal of the power converter; the switching unit is connected between the amplification unit and the current sampling terminals of other power converters; the amplification unit is used to obtain the average current based on the received output sampling currents; the output terminal of the amplification unit is connected to the feedback control module through the filtering unit and the clamping unit.
[0011] In one embodiment, the switching unit includes at least two MOS transistors connected in series back to back.
[0012] In one embodiment, the power converter further includes a power factor correction converter disposed at the input terminal of the power converter.
[0013] A second aspect of this application provides a power supply system including a plurality of power supply devices as described above connected in parallel.
[0014] The beneficial effects of this application embodiment compared with the prior art are: the output can be adjusted based on the average current through the current sampling module and the feedback control module. When each power supply device is equipped with a current sampling module and a feedback control module, the output of each power supply device can be automatically adjusted without additional control equipment.
[0015] Meanwhile, no communication module is needed between power supply units to exchange data and information. Each power supply unit only needs to control itself based on the average current to achieve current sharing, thereby avoiding the problem of inconsistent output of each power supply unit due to communication obstruction and improving the stability and reliability of the system. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of a power supply device provided in an embodiment of this application;
[0017] Figure 2 This is a schematic diagram of the power converter and feedback control module provided in an embodiment of this application.
[0018] Figure 3 A circuit diagram of a current sampling module provided in one embodiment of this application;
[0019] Figure 4 This is another schematic diagram of the power converter and feedback control module provided in one embodiment of this application;
[0020] Figure 5 This is a schematic diagram of the power supply system provided in an embodiment of this application. Detailed Implementation
[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0025] Figure 1 A schematic diagram of a power supply device according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows:
[0026] A power supply device includes: a power converter 100, a current sampling module 200, and a feedback control module 300.
[0027] A power converter 100 converts an input voltage into an output voltage. The power converter 100 includes a current sampling terminal for outputting a sampled current. A first input terminal of a current sampling module 200 is connected to the current sampling terminal of the power converter 100, and a second input terminal of the current sampling module 200 is used to connect to the current sampling terminals of other power converters 100. The current sampling module 200 acquires the average current of the received output sampled currents. A feedback control module 300 is connected to both the current sampling module 200 and the power converter 100, and is used to obtain a voltage deviation signal based on the difference between the output sampled current and the average current, and the output voltage. The power converter 100 also adjusts the output voltage based on the voltage deviation signal.
[0028] Understandably, the current sampling terminal of power converter 100 can also be connected to other power converters 100.
[0029] The current sampling module 200 and feedback control module 300 enable output adjustment based on average current. When each power supply unit is equipped with both, no additional control equipment is needed to automatically adjust the output of each unit, ensuring a consistent output current. Furthermore, when multiple power supply units are connected together, automatic output adjustment is achieved without the need for communication between them.
[0030] Meanwhile, no communication module is needed between power supply units to exchange data and information. Each power supply unit only needs to control itself based on the average current to achieve current sharing, thereby avoiding the problem of inconsistent output of each power supply unit due to communication obstruction and improving the stability and reliability of the system.
[0031] The feedback control module 300 can be composed of logic circuits or implemented by a microcontroller of the power supply device; this embodiment does not limit it.
[0032] In one embodiment, such as Figure 2 As shown, the feedback control module 300 includes a current sharing loop control module 310 and a voltage control module 320. In... Figure 2 In the embodiment shown, the current sampling module 200 can receive the output sampling current I1 provided by the power converter 100 of the same power converter 100 and the output sampling current I2 provided by other power converters 100.
[0033] The input terminal of the current sharing loop control module 310 is connected to the current sampling terminal of the current sampling module 200 and the power converter 100, and the output terminal of the current sharing loop control module 310 is connected to the voltage control module 320. The current sharing loop control module 310 is used to obtain and output the current deviation signal based on the difference between the output sampled current and the average current.
[0034] Specifically, the current sharing loop control module 310 can subtract the output sampling current from the average current to obtain the difference current, and obtain and output the current deviation signal based on the difference current.
[0035] The voltage control module 320 is connected to the power converter 100. The voltage control module 320 is used to obtain and output a voltage deviation signal based on the current deviation signal and the output voltage. The voltage deviation signal is positively correlated with the current deviation signal and negatively correlated with the output voltage.
[0036] Understandably, a positive current deviation signal indicates that the current average current is greater than the output sampling current, thus requiring an increase in the voltage deviation signal to boost the output of the power converter 100. Conversely, a negative current deviation signal indicates that the current average current is less than the output sampling current, requiring a decrease in the voltage deviation signal to reduce the output of the power converter 100. This allows for current sharing among multiple power supply devices.
[0037] Specifically, the current sharing loop control module 310 may include a subtractor 311 and a current sharing loop controller 312. The subtractor 311 is used to subtract the output sampling current from the average current to obtain the difference current. The current sharing loop controller 312 may be a proportional-integral controller, which can convert the difference current into a corresponding voltage signal (current deviation signal).
[0038] In one embodiment, such as Figure 2 As shown, the voltage control module 320 includes a voltage sampling unit 321, a calculation unit 322, and a reference voltage unit 323.
[0039] The voltage sampling unit 321 is connected to the output terminal of the power converter 100 and the calculation unit 322 respectively. The voltage sampling unit 321 is used to sample the output voltage to obtain the sampled voltage.
[0040] The larger the sampling voltage, the smaller the voltage deviation signal output by the feedback control module 300, thus suppressing the output of the power converter 100. Conversely, the smaller the sampling voltage, the larger the voltage deviation signal output by the feedback control module 300, thus increasing the output of the power converter 100. This achieves negative feedback regulation of the output voltage and improves the stability of the output voltage.
[0041] The reference voltage unit 323 is connected to the calculation unit 322 and is used to provide a reference voltage.
[0042] The calculation unit 322 is used to add the current deviation signal to the reference voltage and then subtract the sampling voltage to obtain the voltage deviation signal.
[0043] The voltage sampling unit 321 can obtain the sampled voltage based on the output voltage at a certain ratio through digital-to-analog conversion. The reference voltage can be set according to actual needs.
[0044] The voltage control module 320 is used to process the sampled voltage, reference voltage and current deviation signals to obtain the voltage deviation signal, and the power converter 100 can adjust the output voltage according to the voltage deviation signal.
[0045] In some embodiments, when the reference voltage unit 323 is powered on, the voltage output by the reference voltage unit 323 will increase stepwise from zero until it reaches the reference voltage.
[0046] In one embodiment, such as Figure 2 As shown, the power converter 100 includes a signal processing unit 110, a pulse width modulation (PWM) unit 120, and a power converter 130.
[0047] The signal processing unit 110 is connected to the calculation unit 322 and the pulse width modulation unit 120 respectively. The signal processing unit 110 is used to obtain and output a periodic feedback signal based on the voltage deviation signal. The frequency of the periodic feedback signal is negatively correlated with the voltage deviation signal.
[0048] The pulse width modulation unit 120 is also connected to the power converter 130 and is used to generate and output a pulse width modulation signal based on the periodic feedback signal.
[0049] The power converter 130 is used to convert the input voltage into the output voltage according to the pulse width modulation signal.
[0050] The signal processing unit 110 may include a voltage loop controller, which is used to perform signal conversion.
[0051] The signal processing unit 110 and the pulse width modulation unit 120 are used to control the power converter 130 according to the voltage deviation signal. The signal processing unit 110 and the pulse width modulation unit 120 can change the duty cycle and operating frequency of the power converter 130, thereby achieving the regulation of the output voltage.
[0052] Specifically, when the current deviation signal is positive, it indicates that the current average current is greater than the output sampling current. Therefore, the power converter 130 needs to increase its output current and output voltage. Thus, the pulse width modulation unit 120 can be used to increase the duty cycle of the power converter 130 and decrease its operating frequency. Conversely, when the current deviation signal is negative, it indicates that the current average current is less than the output sampling current. Therefore, the power converter 130 needs to decrease its output current and output voltage. Thus, the pulse width modulation unit 120 can be used to decrease the duty cycle of the power converter 130 and increase its operating frequency.
[0053] In one embodiment, such as Figure 2 As shown, the signal processing unit 110 includes a first voltage loop controller 111 and a second voltage loop controller 112.
[0054] The first voltage loop controller 111 and the second voltage loop controller 112 are respectively connected to the calculation unit 322 and the current sampling terminal. The first voltage loop controller 111 is used to output a periodic feedback signal when the output sampling current is greater than a preset threshold, and the second voltage loop controller 112 is used to output a periodic feedback signal when the output sampling current is less than a preset threshold.
[0055] The output sampling current can reflect whether the load is heavy or light.
[0056] The first voltage loop controller 111 and the second voltage loop controller 112 can be designed for heavy load and light load conditions, respectively.
[0057] In one embodiment, the power converter 130 includes a half-bridge LLC (Inductor-Inductor-Capacitor) resonant converter.
[0058] It should be noted that the higher the operating frequency of the half-bridge LLC resonant converter, the smaller the loop gain and the smaller the output voltage; conversely, the lower the operating frequency of the half-bridge LLC resonant converter, the larger the output voltage.
[0059] The pulse width modulation (PWM) signal can specifically include two PWM sub-signals, which can control the two MOSFETs of the half-bridge LLC resonant converter respectively. This allows for the adjustment of the duty cycle and operating frequency of the half-bridge LLC resonant converter.
[0060] In one embodiment, such as Figure 3 As shown, the current sampling module 200 includes a switching unit 210, an amplification unit 220, a filtering unit 230, and a clamping unit 240.
[0061] The input terminal of the amplifier unit 220 is connected to the current sampling terminal of the power converter 100.
[0062] The switching unit 210 is connected between the amplifier unit 220 and the current sampling terminals of other power converters 100. The amplifier unit 220 is used to obtain the average current based on the received output sampling currents.
[0063] The output of the amplifier unit 220 is connected to the feedback control module 300 through the filter unit 230 and the clamping unit 240.
[0064] The switching unit 210 can be disconnected when other power supply devices are not working, so as to prevent a small current from flowing to other power supply devices and improve the accuracy of the current sampling module 200.
[0065] The filter unit 230 can perform low-pass filtering on the average current to filter out interference signals.
[0066] The clamping unit 240 can clamp the output of the current sampling module 200 to prevent excessive electrical signals from damaging or interfering with the feedback control module 300.
[0067] In one embodiment, such as Figure 3 As shown, the switching unit 210 includes at least two MOSFETs connected in series back to back.
[0068] The back-to-back connection of MOSFETs can prevent current from flowing through the body diode of the MOSFET, thereby preventing a small current from flowing through when the switching unit 210 is turned off.
[0069] Specifically, the switching unit 210 may include a first N-type MOSFET Q1 and a second N-type MOSFET Q2. The drain of the first N-type MOSFET Q1 is used to connect to the current sampling terminal of other power supply devices, the source of the first N-type MOSFET Q1 is connected to the source of the second N-type MOSFET Q2, and the drain of the second N-type MOSFET Q2 is connected to the amplification unit 220.
[0070] In one embodiment, such as Figure 4 As shown, the power converter 100 also includes a power factor correction converter 140 (PFC), which is disposed at the input terminal of the power converter 100.
[0071] Specifically, the power factor correction converter 140 can be a boost-type power factor correction converter 140.
[0072] The power factor correction converter 140 is used to reduce harmonic distortion of the input voltage and improve the power factor.
[0073] Figure 5 A schematic diagram of a power supply system according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:
[0074] A power supply system 20 includes a plurality of power supply devices 10 connected in parallel as described in any of the above embodiments. When each power supply device 10 is equipped with a current sampling module and a feedback control module, the output of each power supply device 10 can be precisely adjusted without the need for additional control equipment.
[0075] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A power supply device, characterized in that, include: A power converter is used to convert an input voltage into an output voltage. The power converter is provided with a current sampling terminal for outputting a sampled current. A current sampling module is provided, wherein a first input terminal of the current sampling module is connected to the current sampling terminal of the power converter, and a second input terminal of the current sampling module is used to connect to the current sampling terminals of other power converters; the current sampling module is used to obtain the average current of each of the received output sampling currents. A feedback control module is connected to both the current sampling module and the power converter, and is used to obtain a voltage deviation signal based on the difference between the output sampled current and the average current and the output voltage. The power converter is also used to adjust the output voltage according to the voltage deviation signal.
2. The power supply device as claimed in claim 1, characterized in that, The feedback control module includes a current sharing loop control module and a voltage control module; The input terminal of the current sharing loop control module is connected to the current sampling module and the current sampling terminal of the power converter, and the output terminal of the current sharing loop control module is connected to the voltage control module. The current sharing loop control module is used to obtain and output a current deviation signal based on the difference between the output sampled current and the average current. The voltage control module is connected to the power converter. The voltage control module is used to obtain and output the voltage deviation signal based on the current deviation signal, the output voltage, and the reference voltage. The voltage deviation signal is positively correlated with the current deviation signal and negatively correlated with the output voltage.
3. The power supply device as described in claim 2, characterized in that, The voltage control module includes a voltage sampling unit, a calculation unit, and a reference voltage unit; The voltage sampling unit is connected to the output terminal of the power converter and the calculation unit respectively. The voltage sampling unit is used to sample the output voltage to obtain the sampled voltage. The reference voltage unit is connected to the computing unit and is used to provide the reference voltage; The calculation unit is used to add the current deviation signal to the reference voltage and then subtract the sampling voltage to obtain the voltage deviation signal.
4. The power supply device as claimed in claim 3, characterized in that, The power converter includes a signal processing unit, a pulse width modulation unit, and a power converter. The signal processing unit is connected to the calculation unit and the pulse width modulation unit respectively. The signal processing unit is used to obtain and output a periodic feedback signal based on the voltage deviation signal. The frequency of the periodic feedback signal is negatively correlated with the voltage deviation signal. The pulse width modulation unit is also connected to the power converter and is used to generate and output a pulse width modulation signal according to the periodic feedback signal. The power converter is used to convert the input voltage into the output voltage according to the pulse width modulation signal.
5. The power supply device as claimed in claim 4, characterized in that, The signal processing unit includes a first voltage loop controller and a second voltage loop controller; The first voltage loop controller and the second voltage loop controller are respectively connected to the computing unit and the current sampling terminal. The first voltage loop controller is used to output the periodic feedback signal when the output sampling current is greater than a preset threshold, and the second voltage loop controller is used to output the periodic feedback signal when the output sampling current is less than a preset threshold.
6. The power supply device as claimed in claim 4, characterized in that, The power converter includes a half-bridge LLC resonant converter.
7. The power supply device according to any one of claims 1 to 6, characterized in that, The current sampling module includes a switching unit, an amplification unit, a filtering unit, and a clamping unit; The input terminal of the amplification unit is connected to the current sampling terminal of the power converter; The switching unit is connected between the current sampling terminals of the amplification unit and other power converters. The amplification unit is used to obtain the average current based on the received output sampling currents. The output of the amplification unit is connected to the feedback control module through the filtering unit and the clamping unit.
8. The power supply device as claimed in claim 7, characterized in that, The switching unit includes at least two MOSFETs connected in series back to back.
9. The power supply device according to any one of claims 1 to 6, characterized in that, The power converter also includes a power factor correction converter, which is disposed at the input terminal of the power converter.
10. A power supply system, characterized in that, It includes multiple power supply devices connected in parallel as described in any one of claims 1 to 9.