Power module and power system

Abstract

The application provides a power module and a power system, and relates to the technical field of power electronics. The power module comprises a main power topology, a digital controller and a plurality of analog control circuits. The main power topology comprises a plurality of isolated converters, the input end of each isolated converter is electrically connected with a direct-current input source, and the output ends of the plurality of isolated converters are all electrically connected with a direct-current bus. The output end of the digital controller is electrically connected with the control end of each analog control circuit. The output end of each analog control circuit is electrically connected with the primary side control end of an isolated converter. The application can reduce the control cost of the power module and can support the parallel connection of multiple independent converters.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a power module and a power system. BACKGROUND

[0002] Switching power supplies are widely used in aerospace, civil, industrial and other occasions. With the development of power electronics technology, higher requirements are put forward for the volume, reliability and cost of power supply products.

[0003] As a commonly used basic topology, the flyback topology has the characteristics of simple topology, few devices, and input-output isolation, but it is mainly used in small power occasions and cannot be applied to high power occasions. To meet the demand for greater power, parallel flyback topology can be used, that is, a power topology with multiple isolated converters.

[0004] However, there are very few control chips for parallel flyback topology, and the price is also relatively high, making it difficult to control the cost. Moreover, as a new direction, digitalization is difficult to support multiple independent converter parallel occasions due to insufficient resources of digital controllers. SUMMARY

[0005] The purpose of the present application is to solve the problem of high control cost of existing power modules and the problem of not supporting multiple independent converter parallel occasions.

[0006] To achieve the above purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0007] In a first aspect, the embodiments of the present application provide a power module, comprising: a main power topology, a digital controller, and a plurality of analog control circuits; wherein the main power topology comprises: a plurality of isolated converters, and the input end of each isolated converter is electrically connected to a direct current input source, and the output end of each isolated converter is electrically connected to a direct current bus.

[0008] The output end of the digital controller is electrically connected to the control end of each analog control circuit to input a control signal to each analog control circuit.

[0009] The output end of each analog control circuit is electrically connected to the primary side control end of an isolated converter, so that each analog control circuit controls the operation of the isolated converter based on the control signal.

[0010] Optionally, the power supply module further comprises a plurality of given circuits, an input end of each given circuit is electrically connected to an output end of the digital controller, and an output end of each given circuit is electrically connected to a control end of one analog control circuit, so that each given circuit outputs the adjusted control signal to the one analog control circuit.

[0011] Optionally, each analog control circuit comprises a control chip and a current inner loop control circuit, and the control end of each analog control circuit comprises a first input end of the control chip.

[0012] The current inner loop control circuit is electrically connected between the first input end and the output end of the control chip, and the output end of the control chip is electrically connected to the primary side control end of the one isolation transformer, so that the control chip generates a current control signal according to the current given signal input by the first input end under the control of the current inner loop control circuit, and outputs the current control signal to the primary side control end of the one isolation transformer to control the input current of the input side of the one isolation transformer.

[0013] The current given signal is a direct current given signal of the input current corresponding to the control signal.

[0014] Optionally, the power supply module further comprises a plurality of input current sampling circuits, an input end of each input current sampling circuit is electrically connected to an input current sampling point of the one isolation transformer, and output ends of the plurality of input current sampling circuits are electrically connected to an input end of the digital controller.

[0015] The output end of the one input current sampling circuit electrically connected to the input current sampling point of the one isolation transformer is further electrically connected to the first input end of the control chip, so that the control chip generates and outputs the current control signal according to the current given signal and the collected input current under the control of the current inner loop control circuit.

[0016] Optionally, each analog control circuit further comprises a voltage limiting loop circuit, and a second input end and an output end of the control chip are further electrically connected to the voltage limiting loop circuit, so that the control chip generates a voltage control signal according to a voltage given signal input by the second input end under the control of the voltage limiting loop circuit, and outputs the voltage control signal to the primary side control end of the one isolation transformer to perform analog voltage limiting control on the output voltage of the output side of the one isolation transformer.

[0017] Optionally, the power supply module further comprises an output voltage sampling circuit.

[0018] An input end of the output voltage sampling circuit is electrically connected to a voltage sampling point of the DC bus; and an output end of the output voltage sampling circuit is electrically connected to an input end of the digital controller.

[0019] The output end of the output voltage sampling circuit is also electrically connected to the second input end, so that the control chip generates and outputs the voltage control signal according to the voltage given signal and the sampled output voltage under the control of the voltage limiting loop circuit.

[0020] Optionally, the power supply module further comprises an auxiliary power supply, an input side capacitor and two output side capacitors.

[0021] The plurality of DC input sources are electrically connected to the input side capacitor through a diode respectively, the input side capacitor is electrically connected to an input end of the auxiliary power supply, and an output end of the auxiliary power supply is electrically connected to a primary side power consumption circuit and a secondary side power consumption circuit through the two output side capacitors respectively.

[0022] The primary side power consumption circuit is a power consumption circuit electrically connected to a primary side of the plurality of isolation converters, and the secondary side power consumption circuit is a power consumption circuit electrically connected to a secondary side of the plurality of isolation converters.

[0023] Optionally, the power supply module further comprises an input voltage sampling circuit, a control end of the input voltage sampling circuit is electrically connected to an input and output port of the digital controller, a plurality of input ends of the input voltage sampling circuit are electrically connected to a plurality of DC input sources respectively, and an output end of the input voltage sampling circuit is electrically connected to an input end of the digital controller.

[0024] Optionally, the input voltage sampling circuit is a multi-channel analog gating chip, an address end of the multi-channel analog gating chip is the control end of the input voltage sampling circuit, a plurality of input ends of the input voltage sampling circuit are a plurality of analog input ends of the multi-channel analog gating chip, and an output end of the input voltage sampling circuit is an analog output end of the multi-channel analog gating chip.

[0025] Optionally, the power supply module further comprises an output current sampling circuit.

[0026] An input end of the output current sampling circuit is electrically connected to a current sampling point of the DC bus; and an output end of the output current sampling circuit is electrically connected to an input end of the digital controller.

[0027] In a second aspect, the embodiments of the present application further provide a power supply system, comprising: a plurality of DC input sources and the power supply module of any one of the first aspect.

[0028] The present application has the following beneficial effects:

[0029] The power module and power system provided in this application embodiment may include: a main power topology, a digital controller, and multiple analog control circuits. The main power topology includes: multiple isolated converters, each isolated converter having its input terminal electrically connected to a DC input source, and the output terminals of the multiple isolated converters being electrically connected to a DC bus. The output terminal of the digital controller is electrically connected to the control terminal of each analog control circuit to input control signals to each analog control circuit. The output terminal of each analog control circuit is electrically connected to the primary-side control terminal of an isolated converter, so that each analog control circuit controls an isolated converter to operate based on the control signals. This power module can control multiple isolated converters through the cooperation of the digital controller and multiple analog control circuits, realizing analog-digital hybrid control of the main power topology including multiple isolated converters. The digital controller, through flexible and adaptive control algorithms, realizes functions such as DC input source adaptation and current control, effectively reducing the control cost required for energy control of the main power topology. The use of inexpensive analog control circuits alleviates the resource shortage of the digital controller, effectively supporting flexible control in multi-channel independent parallel applications. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 Circuit diagram of the power module provided in the embodiments of this application Figure 1 ;

[0032] Figure 2 Circuit diagram of the power module provided in the embodiments of this application Figure 2 ;

[0033] Figure 3 A circuit diagram of a given circuit provided in an embodiment of this application;

[0034] Figure 4 A schematic diagram of an analog control circuit in a power module provided in an embodiment of this application. Figure 1 ;

[0035] Figure 2 A schematic diagram of an analog control circuit in a power module provided in an embodiment of this application. Figure 6 ;

[0036] Figure 7A circuit schematic of an isolated converter provided for an embodiment of the present application

[0037] Figure 8 A circuit schematic of an auxiliary power module provided for an embodiment of the present application

[0038] Figure 3 A circuit schematic of a power module provided for an embodiment of the present application Figure 9 ;

[0039] Figure 4 A circuit schematic of a power module provided for an embodiment of the present application Figure 10 ;

[0040] Figure 11 A circuit schematic of a multi-channel analog gating chip provided for an embodiment of the present application

[0041] Figure 5 A circuit schematic of a power module provided for an embodiment of the present application Figure 12 ;

[0042] Figure 6 A circuit schematic of a power module provided for an embodiment of the present application Figure 13 ;

[0043] Figure 1 A circuit schematic of a power module provided for an embodiment of the present application

[0044] Reference signs:

[0045] 11 - main power topology; 12 - digital controller; 13 - analog control circuit; 111 - isolated converter; 20 - DC input source; 112 - DC bus; 131 - control chip; 132 - current inner loop control circuit; Iin_ref - current given signal; 133 - voltage limiting voltage loop circuit; U_ref - voltage given signal; 14 - given circuit; 141 - filter circuit; 142 - operational amplifier; Cin - input capacitor; Q1 - first switch tube; Q2 - second switch tube; LA - first high-frequency mutual inductor; LB - second high-frequency mutual inductor; D1 - first diode; D2 - second diode; D3 - third diode; D4 - fourth diode; Co1 - first output capacitor; Co2 - second output capacitor; 15 - auxiliary power module; 151 - auxiliary power supply; 152 - input side capacitor; 153 - output side capacitor; 16 - input current sampling circuit; Iin - input current; Ip_A - secondary output end; Ip_B - secondary output end; Vin - DC input voltage; 17 - input voltage sampling circuit; 171 - multi-channel analog gating chip; 18 - output voltage sampling circuit; Vdc - output voltage; 19 - output current sampling circuit; Io - output current; 200 - temperature detection circuit; 201 - communication interface; 10 - power module. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0047] The power modules and power systems provided in the following embodiments of this application can be applied to situations where there are multiple DC input sources, and the input sources and outputs need to be isolated. They are particularly suitable for medium-power, multi-input, independently controlled digital scenarios with low-voltage inputs and high-voltage outputs. For example, they can be applied to photovoltaic, battery, and fuel cell applications. Accordingly, the multiple DC input sources can be multiple photovoltaic DC input sources such as photovoltaic panels, multiple battery input sources, or multiple fuel cell input sources. In other applications, the multiple DC input sources can also be other forms of DC input sources.

[0048] This application provides a method to combine a digital controller with an analog control circuit to support the functional control of a power module with interleaved parallel flyback circuits. It fully utilizes the advantages of digital information interaction, design flexibility, and stability, and uses inexpensive analog control circuits to alleviate the resource shortage of the digital controller. This enables the digital controller and analog control circuits to work together to control multiple isolation converters, realizing hybrid analog-digital control of the main power topology including multiple isolation converters. It also enables flexible control of the main power topology. The digital controller, through flexible and adaptive control algorithms, achieves functions such as DC input source adaptation and current control.

[0049] The power module provided in this application is illustrated below with circuit diagrams and multiple examples.

[0050] Figure 1 Circuit diagram of the power module provided in the embodiments of this application Figure 1 ,like Figure 1 As shown, the power module may include: a main power topology 11, a digital controller 12, and multiple analog control circuits 13. The main power topology 11 includes multiple isolation converters 111, each isolation converter 111 being a flyback circuit, such as an interleaved parallel flyback circuit. The input terminal of each isolation converter 111 is electrically connected to a DC input source 20, and the output terminals of the multiple isolation converters 111 are all electrically connected to a DC bus 112.

[0051] The output of the digital controller 12 is electrically connected to the control terminal of each analog control circuit 13 to input a control signal to each analog control circuit 13. A power module having these multiple isolation converters 111 can be called a flyback power module.

[0052] The output end of each analog control circuit 13 is electrically connected to the primary side control end of an isolation converter 111, so that each analog control circuit 13 controls one isolation converter 111 to work based on the control signal.

[0053] The plurality of DC input sources 20 in the power module can be photovoltaic DC input sources, battery DC input sources, or combustion cell DC input sources, or other forms of DC input sources. Each isolation converter 111 in the main power topology 11 is electrically connected to one DC input source 20, that is, the main power topology 11 is a parallel scheme for the plurality of DC input sources 20. The plurality of DC input sources 20 are independent of each other. Each DC input source is electrically connected to the input end of one isolation converter 111, that is, high-voltage output can be achieved through high-frequency isolation, and enhanced isolation of input and output can also be achieved, such as enhanced insulation magnetic isolation of input and output, which is safer and more reliable. Compared with the traditional series scheme of the plurality of DC input sources 20, the power module provided by the application is a parallel scheme of the plurality of DC input sources 20, and each isolation converter 111 operates independently without the need for uniform control, which is safe and reliable. The power module can also be called a power optimizer. For example, if the plurality of DC input sources 20 are a plurality of photovoltaic DC input sources, the corresponding product form of the power module can be a photovoltaic power module or a photovoltaic power optimizer.

[0054] Each isolation converter 111 can be a DC (DC / DC) isolation converter, that is, a DC converter with input and output isolation. Each isolation converter 111 can convert the energy of the DC input source connected thereto and output to the output bus of the each isolation converter 111. The output buses of the plurality of isolation converters 111 are all connected to a DC bus 112, which can be a total DC bus inside the power module. The DC bus 112 can be electrically connected to an output load through an output capacitor to provide DC input for the output load. The output load can be, for example, other power electronic devices in the rear stage of the power module.

[0055] The plurality of isolation converters 111 can be integrated inside the power module. The specific number of isolation converters inside the power module can be flexibly planned and configured according to the preset product planning and actual application occasions. The number of DC input sources 20 connected to the power module is not limited, and the isolation converters 111 in the power module can adapt to various forms of DC input sources, and each isolation converter 111 has independent maximum power point tracking (MPPT) function. In this way, the power module with the plurality of isolation converters 111 can also realize the MPPT function of the plurality of DC input sources.

[0056] The digital controller 12 can be a digital controller or a digital control chip, which has a digital control function and can convert an input digital signal into a control signal based on a pre-configured control rule. The control signal can be a direct current given signal or a pulse control signal such as a pulse width modulation (PWM) signal.

[0057] Correspondingly, each analog control circuit 13 also has an analog control function and can generate a primary side control signal based on the control signal from the digital controller 12 and output the primary side control signal to the primary side control end of the corresponding isolation converter 111, so that the isolation converter 111 can be controlled based on the primary side control signal, and the analog control circuit 13 realizes analog inner loop control of the isolation converter 111. Since the flyback circuit usually operates in a peak current mode, and the power supply module has multiple isolation converters 111, the primary side average current control of the multiple isolation converters 111 can be realized by the analog-digital hybrid control, the power size of the main power topology is adjusted, and then the energy control of the power supply module is performed.

[0058] The power supply module provided in the embodiment can include a main power topology, a digital controller, and multiple analog control circuits. The main power topology includes multiple isolation converters, the input end of each isolation converter is electrically connected to a direct current input source, and the output end of each isolation converter is electrically connected to a direct current bus. The output end of the digital controller is electrically connected to the control end of each analog control circuit to input a control signal to each analog control circuit. The output end of each analog control circuit is electrically connected to the primary side control end of an isolation converter, so that each analog control circuit controls the operation of an isolation converter based on the control signal. The power supply module can control the multiple isolation converters by the cooperation of the digital controller and the multiple analog control circuits, realize analog-digital hybrid control of the main power topology including the multiple isolation converters, and realize direct current input source adaptation and current control by the flexible and adaptive control algorithm of the digital controller. The control cost required for energy control of the main power topology is effectively reduced, the contradiction between the insufficient resources of the digital controller and the analog control circuit is resolved, and flexible control in multiple independent parallel scenarios is effectively supported.

[0059] Based on the power supply module shown in the above Figure 2 The embodiment of the present application can also provide a possible example of a power supply module. Figure 2 The circuit schematic of the power supply module provided in the embodiment of the present application is shown in the above Figure 1 As shown in the above Figure 2 The circuit schematic of the power supply module provided in the embodiment of the present application is shown in the above Figure 3On the basis of the shown power module, the power module can further comprise: a plurality of given circuits 14, an input end of each given circuit 14 is electrically connected to an output end of the digital controller 12, and an output end of each given circuit 14 is electrically connected to a control end of an analog control circuit 13, so that each given circuit 14 outputs the adjusted control signal to an analog control circuit 13. The Figure 3 In the embodiment, the connection path between the digital controller 12, the given circuit 14 and the analog control circuit 13 is exemplarily shown, and in actual application scenarios, the number of the given circuits 14 and the analog control circuits 13 is the same, and they are connected one by one.

[0060] If the control signal output by the digital controller 12 is a pulse control signal, the output end of the digital controller 12 outputting the control signal can be a pulse output end, that is, the pulse output end of the digital controller 12 is electrically connected to the output end of each given circuit 14. In the embodiment, the pulse control signal can be used as an inner loop given signal, and each given circuit 14 can adjust and process the pulse control signal to restore the pulse control signal to a direct current given signal such as a direct current given signal Iin_ref of the input current. The adjustment and processing of each given circuit 14 on the pulse control signal can include filtering processing and duty cycle adjustment processing, etc.

[0061] The power module provided in the embodiment can output a pulse control signal through a pulse output end of a digital controller in the case that the digital-to-analog (DA) resource of the digital controller is insufficient, and adjust and process the pulse control signal by using a given circuit to restore it to a direct current given signal, so as to provide the direct current given signal for the control end of each analog control circuit and ensure the accuracy of the control of the analog control circuit on the isolated converter based on the adjusted control signal.

[0062] It should be noted that if the control signal output by the digital controller 12 is a direct current given signal, the digital controller 12 and the plurality of analog control circuits 13 in the power module can not need to be provided with given circuits, and the direct current given signal can be directly output to the plurality of analog control circuits 13.

[0063] In the case that the DA resource of the digital controller is sufficient, the pulse control signal can not need to be output through the pulse output end of the digital controller, and the direct current given signal can be output through the direct current output end of the digital controller.

[0064] That is, as mentioned above, the output end of the digital controller can be a direct current output end, and the control signal output by the digital controller is a direct current given signal; or the output end of the digital controller can be a pulse output end, and the control signal output by the digital controller is a pulse control signal.

[0065] An example is also provided below for a possible implementation of the given circuit. Figure 4 A circuit schematic of a given circuit is provided in an embodiment of the present application. As shown in Figure 1 the given circuit 14 may, for example, include a filter circuit 141 and an operational amplifier 142. The filter circuit 141 may, for example, be an RC filter circuit, i.e., include a filter resistor and a filter capacitor. The input end of the filter circuit 141 is electrically connected to the pulse output end of the digital controller 12 as the input end of the given circuit 14 to receive the pulse control signal output by the digital controller 12, such as a PWM signal, for example, a 100 kHz PWM signal. It should be noted that the bandwidth of the filter circuit 141 in this given circuit 14 needs to be greater than or equal to a preset bandwidth threshold, i.e., cannot be too low, to avoid too much impact on the control loop.

[0066] The output end of the filter circuit 141 is electrically connected to the same direction input end of the operational amplifier 142, the opposite direction input end of the operational amplifier 142 is electrically connected to the output end of the operational amplifier 142, and the output end of the operational amplifier 142 can be used as the output end of the given circuit 14 and is electrically connected to the control end of an analog control circuit 13 to output the processed direct current given signal thereto.

[0067] The given circuit provided in this embodiment can, in the case of insufficient digital-to-analog conversion resources of the digital controller, perform low-pass filtering on the pulse control signal through the filter circuit 141, and through the follower circuit of the operational amplifier 142, adjust the duty cycle of the signal to restore the pulse control signal to a direct current, i.e., a direct current given signal, and output the adjusted direct current given signal to the control end of the analog control circuit 13 for the analog control circuit 13 to control the isolated converter 111 according to the input direct current given signal.

[0068] On the basis of the power supply module provided in the above embodiment, an internal structure of an analog control circuit is provided in an embodiment of the present application to realize inner loop control of the input current of the isolated converter. Figure 4 A schematic diagram of an analog control circuit in a power supply module is provided in an embodiment of the present application. Figure 5 As shown in Figure 2 each analog control circuit 13 as shown above includes a control chip 131 and a current inner loop control circuit 132. The control end of each analog control circuit 13 can include the first input end of the control chip 131.

[0069] The first input end of the control chip 131 can be used as a control end of each analog control circuit 13 to receive an input current given signal. The first input end and the output end of the control chip 131 are electrically connected to the current inner loop control circuit 132. The output end of the control chip 131 is electrically connected to the primary side control end of the isolation transformer 111, so that the control chip 131 generates a current control signal according to the current given signal Iin_ref input by the first input end under the control of the current inner loop control circuit 132, and outputs the current control signal to the primary side control end of the isolation transformer, to control the input current of the input side of the isolation transformer 111.

[0070] The current given signal is a direct current given signal of the input current corresponding to the control signal output by the digital controller 12, and can also be a direct current given signal after being restored by the above given circuit.

[0071] In an example, the first input end of the control chip 131 can be electrically connected to the first direct current output end of the digital controller 12 to receive the direct current given signal of the input current output by the digital controller 12. That is, the direct current given signal of the input current can be a control signal directly output by the direct current output end of the digital controller 12.

[0072] In another example, the first input end of the control chip can be electrically connected to the output end of the above given circuit to receive the given signal of the input current obtained by processing the control signal output by the digital controller by the given circuit. That is, the direct current given signal of the input current can be a signal obtained by processing the control signal output by the pulse output end of the digital controller 12 by the given circuit.

[0073] The current inner loop control circuit 132 is connected between the first input end and the output end of the control chip 131, so that the control chip 131 generates a current control signal based on the direct current given signal of the input current under the control of the current inner loop control circuit 132, and controls the input current of the isolation transformer 111 connected thereto according to the current control signal, so that the isolation transformer 111 can work based on the input current given amount corresponding to the current control signal, thereby realizing the average control of the input current of the plurality of isolation transformers 111 in the main power topology, and realizing the control of the plurality of isolation transformers 111 based on the average current mode.

[0074] In an example, the control chip 131 can be a TL494 control chip, and the current inner loop control circuit is obtained by configuring corresponding peripheral circuits to realize the control of the current inner loop.

[0075] Taking the TL494 control chip as an example, the control chip 131 internally integrates two operational amplifiers, and the control chip 131 can have two groups of input terminals. The first input terminal involved in this embodiment can be any one of the two groups of input terminals. The two groups of input terminals can be a group of input terminals of 1 pin and 2 pin, and another group of input terminals of 15 pin and 16 pin. The output terminal of the control chip 131 can be 3 pin, that is, the output terminal common to the two operational amplifiers, and the output logic of the two operational amplifiers is two-way amplification processing. The control chip 131 can amplify the direct current given signal of the input current under the control of the current inner loop control circuit 132 to obtain a current control signal.

[0076] In addition, the control chip 131 also has a power supply, a reference voltage, an oscillator, and two configurable drive outputs. Through the two configurable drive outputs, the output form of 180-degree staggering or parallel output can be realized.

[0077] The periphery of the control chip 131 is configured with a current inner loop control circuit 132 around the two operational amplifiers. After the input current given signal is amplified by the operational amplifier in the control chip 131, a current control signal is generated and output. According to the current control signal, the primary side control terminal of the corresponding isolated converter 111 is controlled, the input current of the isolated converter 111 is controlled, and the input current of the primary side of the multiple isolated converters 111 is averaged, that is, the average current of the primary side.

[0078] The power supply module provided in this embodiment can realize the control of the input side current of the isolated converter, that is, the primary side input current, based on the direct current given signal of the input current, through the cooperation of the control chip and the current inner loop control circuit, so that the input current of the multiple isolated converters 111 is averaged, and the control of the multiple isolated converters 111 based on the average current mode is realized.

[0079] Optionally, the embodiment of the present application can also provide an internal structure of a model control circuit to realize the voltage limiting control of the output voltage of the isolated converter. Figure 5 A schematic diagram of an analog control circuit in a power supply module provided in the embodiment of the present application Figure 6 As shown in Figure 6 each analog control circuit 13 also includes a voltage limiting loop circuit 133, and the voltage limiting loop circuit 133 is electrically connected between the second input terminal and the output terminal of the control chip 131, so that the control chip 131 generates a voltage control signal according to the voltage given signal input by the second input terminal under the control of the voltage limiting loop circuit 133, and outputs the voltage control signal to the primary side control terminal of one isolated converter 111, to realize the analog voltage limiting control of the output voltage of the output side of the isolated converter 111.

[0080] The voltage given signal U_ref can be a direct current given signal of the output voltage. The control chip 131 can obtain and output the voltage control signal after amplifying the input voltage given signal under the control of the voltage limiting loop circuit 133.

[0081] In an example, the control end of each analog control circuit 13 further comprises a second input end of the control chip 131. The second input end of the control chip 131 can be another control end of each analog control circuit 13, and is electrically connected to a second direct current output end of the digital controller 12 to receive a direct current given signal of the output voltage output by the digital controller 12, i.e., the direct current given signal. In this example, the given value of the output voltage corresponding to the voltage given signal is determined by the digital controller.

[0082] In another example, the second input end of the control chip 131 can be electrically connected to a voltage dividing connection point of a preset voltage dividing circuit to receive a resistance voltage dividing signal of the voltage dividing connection point, and take the resistance voltage dividing signal as the direct current given signal of the output voltage. In this another example, the given value of the output voltage corresponding to the voltage given signal is a fixed voltage value corresponding to the voltage dividing connection point.

[0083] The voltage limiting loop circuit 133 is connected between the second input end and the output end of the control chip 131, so that the control chip 131 generates the voltage control signal based on the voltage given signal under the control of the voltage limiting loop circuit 133, and controls the output voltage of the isolation converter 111 connected thereto according to the voltage given signal, so that the isolation converter 111 can work based on the output voltage given amount corresponding to the voltage control signal, thereby realizing the analog voltage limiting control of the output voltage of the plurality of isolation converters 111 in the main power topology.

[0084] Continuing to take the TL494 control chip as an example, the periphery of the control chip 131 is further configured with the voltage limiting loop circuit 133 around the two amplifiers. The second input end of the control chip 131 can be another group of input ends between the two groups of input ends.

[0085] The input voltage given signal is amplified by the control chip 131 to generate the voltage control signal, and the voltage control signal is output to the primary side control end of the isolation converter 111 to control the output voltage of the corresponding isolation converter 111 based on the voltage control signal.

[0086] It should be noted that the analog voltage limiting value corresponding to the voltage control signal can exceed the preset voltage range of the digital voltage limiting value of the voltage given signal.

[0087] The power module provided by the embodiment has the voltage limiting loop circuit in each analog control circuit and the output voltage limiting loop of the digital controller (not described in detail herein) jointly acting to realize double voltage limiting protection of the output voltage of the isolation converter, and prevent the voltage from being uncontrollable due to sudden changes in the load through two defense lines of the digital and analog.

[0088] It should be noted that in the power module provided by the embodiment, the output end of the control chip 131 in each analog control circuit can output the current control signal under the control of the current inner loop control circuit 132, and can output the voltage control signal under the control of the voltage limiting loop circuit 133. The two control signals generated in the control chip 131, i.e., the current control signal and the voltage control signal, can determine which control signal is finally output in a preset dependent manner. For example, in a dependent manner of taking the smaller one, the signal with the smaller amplitude in the current control signal and the voltage control signal can be taken as the target control signal and output to the primary side controller of the isolation converter through the output end of the control chip 131 to control the isolation converter 111 to realize corresponding control. For example, if the current control signal is the target control signal, the input current of the isolation converter 111 can be controlled based on the current control signal; if the voltage control signal is the target control signal, the output voltage in the isolation converter 111 can be controlled.

[0089] In another example, the embodiment of the present application can also provide a possible implementation manner of an isolation converter. Figure 7 A circuit schematic diagram of an isolation converter provided by the embodiment of the present application is shown in FIG. 2. Figure 7 As shown in FIG. 2, the isolation converter 111 can include an input capacitor Cin, a first switch tube Q1, a second switch tube Q2, a first high-frequency mutual inductor LA, a second high-frequency mutual inductor LB, two transformers, four diodes such as a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, and two output capacitors such as a first output capacitor Co1 and a second output capacitor Co2.

[0090] Two ends of the input capacitor Cin are electrically connected to two ends of a direct current input voltage Vin, and a positive electrode of the direct current input voltage Vin is electrically connected to one primary side input end of each of the two transformers. The first switch tube Q1 and the second switch tube Q2 are metal oxide semiconductor (MOS) tubes, for example, NMOS tubes. The source of the first switch tube Q1 and the source of the second switch tube Q2 are electrically connected to the other primary side input end of each of the two transformers. The gate of the first switch tube Q1 and the gate of the second switch tube Q2 are used as the primary side control end of the isolation transformer 111, and the first control signal PWMA and the second control signal PWMB in the signal output by the analog control circuit 13 can be output to the gate of the first switch tube Q1 and the gate of the second switch tube Q2, respectively.

[0091] The drain of the first switch tube Q1 and the drain of the second switch tube Q2 are electrically connected to the primary side input end of the first high-frequency inductor LA and the primary side input end of the second high-frequency inductor LB, respectively. The other primary side input end of the first high-frequency inductor LA and the other primary side input end of the second high-frequency inductor LB are grounded. In this way, the primary sides of the two transformers are staggered in parallel. The first high-frequency inductor LA and the second high-frequency inductor LB can be high-frequency inductors with a ratio of 1:200, for example.

[0092] Each transformer has two secondary side output ends connected in series, and each of the two secondary side output ends of each transformer is electrically connected to a diode and an output capacitor. For example, the two secondary side output ends of one transformer are electrically connected to the first output capacitor Co1 and the second output capacitor Co2 through the first diode D1 and the second diode D2, respectively. The two secondary side output ends of the other transformer are electrically connected to the first output capacitor Co1 and the second output capacitor Co2 through the third diode D3 and the fourth diode D4, respectively.

[0093] For each transformer, the two output ends are connected in series, and the different transformers are connected in parallel with the output capacitors. In this way, the secondary sides of the two transformers are first connected in series and then staggered in parallel, with a staggering of 180 degrees, equivalent to 2 times the frequency, which can reduce the stress of the input and output devices.

[0094] The two output capacitors in the isolation transformer 111 can automatically achieve voltage equalization. The first control signal PWMA and the second control signal PWMB input to the gate of the first switch tube Q1 and the gate of the second switch tube Q2 can make the isolation transformer work at a preset duty cycle, for example, in a discontinuous conduction mode (DCM) with a duty cycle less than 0.5, or in other modes. The preset duty cycle can be the duty cycle of the control signal output by the analog control circuit 13 to the isolation transformer 111.

[0095] In the main power topology 11, the input capacitor Cin, the first output capacitor Co1 and the second output capacitor Co2 in the isolation converter 111 can all use thin film capacitors, which are safe and reliable and have long service life. For example, in the DCM mode of the interleaved parallel flyback circuit isolation converter, the output voltage only depends on the load resistance and the input power, and through the design of appropriate transformer ratio parameters, the high voltage can be easily output under the condition of meeting the stress. The current on the low voltage side is large, and multiple parallel switching tubes are used to reduce the on-state resistance. The output side voltage is high and the current is small, and the shock amplitude is large, and a silicon carbide diode or a fast recovery diode with excellent performance can be used.

[0096] In other possible implementations, the embodiment of the present application can also provide an implementation example of a power supply module, which is illustrated below in combination with an auxiliary power supply to supply power to the circuit in the power supply module. Figure 8 A circuit schematic diagram of an auxiliary power supply module provided by the embodiment of the present application is shown in FIG. 2. As shown in FIG. 2, the power supply module can also include an auxiliary power supply module 15. The auxiliary power supply module 15 can include an auxiliary power supply 151, an input side capacitor 152 and two output side capacitors 153. The auxiliary power supply 151 can be an auxiliary power supply chip or other forms of auxiliary power supply. Figure 3

[0097] The multiple DC input sources 20 are respectively connected to the input side capacitor 152 through a diode, the input side capacitor 152 is connected to the input end of the auxiliary power supply 151, and the output end of the auxiliary power supply 151 is respectively connected to the primary side power consumption circuit and the secondary side power consumption circuit through the two output side capacitors 153.

[0098] The primary side power consumption circuit is a power consumption circuit connected to the primary side of the multiple isolation converters 111, and the secondary side power consumption circuit is a power consumption circuit connected to the secondary side of the multiple isolation converters 111.

[0099] The multiple DC input sources 20 are respectively connected to the input side capacitor 152 through a diode, which realizes that the multiple DC input sources 20 are connected in parallel in an "or" manner, and the DC input source with the maximum voltage among the multiple DC input sources 20 provides input for the auxiliary power supply 151. As long as there is any DC input source with power among the multiple DC input sources 20, the normal work of the auxiliary power supply 151 can be ensured. The voltage on both sides of the input side capacitor 152 is the input voltage of the auxiliary power supply 151, which is the maximum voltage among the multiple DC input sources 20.

[0100] ​The two output terminals of the auxiliary power supply 151 are respectively connected to two output-side capacitors 153, achieving isolation between the two output voltages. The first voltage V1 output by the auxiliary power supply 151 can be the voltage across one output-side capacitor 153, and the second voltage V2 output by the auxiliary power supply 151 can be the voltage across the other output-side capacitor 153.

[0101] The two output-side capacitors 153 can be electrically connected to the primary-side power supply circuit and the secondary-side power supply circuit respectively, providing independent power supply to the primary-side power supply circuit and the secondary-side power supply circuit in an isolated manner. The main power topology is divided into primary-side and secondary-side by an isolation converter, and thus the power supply to the primary-side and secondary-side must also be isolated. For example, the first voltage V1 can be output to the primary-side power supply circuit, and the second voltage V2 can be output to the secondary-side power supply circuit.

[0102] The primary-side power supply circuit is the power supply circuit that electrically connects to the primary side of multiple isolation converters 111, such as the primary-side digital controller 12, analog control circuit 13, and primary-side sampling circuits, such as input current sampling circuits and input voltage sampling circuits.

[0103] The secondary-side power supply circuit is the power supply circuit that electrically connects the secondary side of multiple isolation converters 111, such as the output voltage sampling circuit and output current sampling circuit connected to the primary side.

[0104] Of course, the supply voltage required by the primary-side power circuit and the secondary-side power circuit may not be the same. For example, one power circuit on the primary side may require a supply voltage of 12V, another requires 5V, and yet another requires 3.3V. Therefore, each output-side capacitor 153 can be connected to a corresponding power conversion circuit to convert the voltage output by the output-side capacitor 153 into the corresponding supply voltage to meet the power supply requirements.

[0105] The power module provided in this embodiment can connect multiple DC input sources 20 in parallel in an "OR" manner, and the DC input source with the highest voltage among the multiple DC input sources can provide input to the auxiliary power supply. As long as any DC input source is powered, the normal operation of the auxiliary power supply can be guaranteed.

[0106] Optionally, embodiments of this application may also provide possible implementations of the power module. Figure 8 Circuit diagram of the power module provided in the embodiments of this application Figure 8 .like Figure 6 As shown, the power module may further include: multiple input current sampling circuits 16, the input terminal of each input current sampling circuit 16 being electrically connected to the input current sampling point of an isolation converter 111, and the output terminals of the multiple input current sampling circuits 16 being electrically connected to the input terminal of the digital controller 12.

[0107] An output end of the input current sampling circuit 16 electrically connected with the input current sampling point of the isolation transformer 111 is electrically connected with a first input end of the control chip 131, so that the control chip 131 generates and outputs a current control signal under the control of the current inner loop control circuit 132 according to the current given signal Iin_ref and the collected input current Iin.

[0108] The control chip generates and outputs the current control signal based on the input current given signal and the collected input current, which can realize loop control on the input current of the corresponding isolation transformer 111, so that the analog control circuit 13 controls the input current of the isolation transformer 111 more accurately.

[0109] It should be noted that, Figure 9 The connection path between the digital controller 12, the input current sampling circuit 16, and the analog control circuit 13 is exemplarily illustrated, and in actual application scenarios, for a plurality of input current sampling circuits 16 and a same number of isolation transformers 111, the input ends thereof are electrically connected with the input current sampling points of the corresponding isolation transformers 111, and the output ends thereof are electrically connected with the input ends of the analog control circuits 13 of the corresponding isolation transformers 111.

[0110] The input current sampling point of each isolation transformer 111 can be a current sampling point on the primary side of each isolation transformer 111 in the main power topology 11, that is, a current sampling point of a switch tube on the primary side of the isolation transformer 111, for example Figure 4 The secondary output end Ip_A of the first high-frequency mutual inductor LA and the secondary output end Ip_B of the second high-frequency mutual inductor LB in the isolation transformer 111. The input end of each input current sampling circuit 16 is electrically connected with an input current sampling point of an isolation transformer 111, which can sample the current of the first switch tube Q1 and the second switch tube Q2 on the primary side of the isolation transformer 111.

[0111] By electrically connecting the input current sampling point on the primary side of each isolation transformer 111, such as the secondary output end Ip_A of the first high-frequency mutual inductor LA and the secondary output end Ip_B of the second high-frequency mutual inductor LB, through the input end of the input current sampling circuit 16, direct current pulse sampling of the switch tube current in the isolation transformer 111 can be realized.

[0112] By sampling the input current on the primary side of the plurality of isolation transformers through the plurality of input current sampling circuits 16 respectively, and outputting to the analog control circuit 13 and the digital controller 12, the analog control circuit 13 and the digital controller 12 can be facilitated to accurately control the power of the power supply module.

[0113] For example, each input current sampling circuit 16 can include two first diodes and a sampling resistor, the input end of each input current sampling circuit 16 is an anode of the two first diodes, and the input current sampling point of each isolated converter 111 is a current sampling point of two switch tubes in each isolated converter 111.

[0114] The anodes of the two first diodes are electrically connected to the current sampling points of the two switch tubes respectively, the cathodes of the two first diodes are electrically connected to one end of the sampling resistor, and the other end of the sampling resistor is the output end of each input current sampling circuit.

[0115] In the input current sampling circuit provided by the embodiment, the current sampling points of the two switch tubes in each isolated converter 111 can be converted into a voltage signal by the pulse triangular wave current signal output by the diode through the sampling resistor, the sampling voltage is twice the frequency of the staggered triangular wave, and after filtering such as RC low-frequency filtering, the voltage signal is approximately direct current, and is transmitted to the input end of the analog control circuit and the digital controller, so as to ensure accurate control of the input power supply.

[0116] Optionally, the embodiment of the present application can also provide a possible implementation manner of the power supply module. Figure 9 Circuit schematic of the power supply module provided by the embodiment of the present application Figure 10 As shown in Figure 10 , the power supply module can further include an input voltage sampling circuit 17, the control end of the input voltage sampling circuit 17 is electrically connected to the input and output port of the digital controller 12, the multiple input ends of the input voltage sampling circuit 17 are respectively electrically connected to the multiple direct current input sources 20, and the output end of the input voltage sampling circuit 17 is electrically connected to the input end of the digital controller 12.

[0117] The input voltage sampling circuit 17 can have multiple input ends and one output end, and the voltage sampling of the multiple direct current input sources 20 can be realized by means of time-sharing sampling. The digital controller 12 can output a gating control signal to the control end of the input voltage sampling circuit 17 through the input and output port (IO port), and the input voltage sampling circuit 17 can control the communication between the input end connected to the target direct current input source and the output end based on the gating control signal, so as to realize the voltage sampling of the target direct current input source. For example, the gating control signal can be an address gating signal corresponding to the target direct current input source.

[0118] The following is explained and described by means of one possible example of the input voltage sampling circuit, for example, the multi-channel analog gating chip. Figure 10 Circuit schematic of the multi-channel analog gating chip provided by the embodiment of the present application. As shown in Figure 11As shown, the address end of the multi-channel analog gating chip 171 is electrically connected to the control end of the input voltage sampling circuit 17, the multiple input ends of the input voltage sampling circuit 17 are electrically connected to the multiple analog input ends of the multi-channel analog gating chip 171, and the output end of the input voltage sampling circuit 17 is electrically connected to the analog output end of the multi-channel analog gating chip 171.

[0119] In this example, the multi-channel analog gating chip 171 is used as the input voltage sampling circuit, Figure 5 In this example, the multi-channel analog gating chip 171 is used as the input voltage sampling circuit,

[0120] The address pins S0, S1 and S2 of the multi-channel analog gating chip 171 can be used as the control end of the input voltage sampling circuit 17, receive the digital gating address output by the digital controller 12, and realize 8-channel gating from address 000 to address 111. Each address can correspond to a DC input source. For example, address 001 can make the analog input end A1 of the multi-channel analog gating chip 171 communicate with the analog output end A, and the voltage Vinx sampled by the input voltage sampling circuit 17 is the input voltage of the DC input source connected to the analog input end A1, i.e., Vin2.

[0121] In the power supply module provided in this example, the input voltage sampling circuit 17 can sample the voltages of multiple DC input sources in a time-division multiplexing manner, realize time-division sampling of multiple input voltages, and effectively solve the contradiction between insufficient digital-to-analog (DA) resources of the digital controller and high cost of externally configured analog-to-digital converters. Since a certain time is required to sample the voltage of each DC input source, the holding time of the interval between adjacent two DC input sources can be determined in advance based on the control time accuracy of the power supply module.

[0122] Optionally, the embodiments of the present application can also provide possible implementation modes of the power supply module. Figure 11 The power supply module provided in the embodiments of the present application Figure 1 As shown in the circuit schematic Figure 12 As shown, the power supply module further includes an output voltage sampling circuit 18. The input end of the output voltage sampling circuit 18 is electrically connected to the voltage sampling point of the DC bus, and the output end of the output voltage sampling circuit 18 is electrically connected to the input end of the digital controller 12.

[0123] The output end of the output voltage sampling circuit 18 is also electrically connected to the second input end of the control chip 131, so that the control chip 131 generates and outputs the voltage control signal according to the voltage given signal U_ref and the sampled output voltage Vdc under the control of the voltage limiting loop circuit 133.

[0124] The output end of the output voltage sampling circuit 18 is also electrically connected to the second input end of the control chip 131, so that the control chip 131 in the analog control circuit 13 can control the output voltage of the corresponding isolated converter 111 based on the voltage given signal and the sampled output voltage, so that the analog control circuit 13 controls the output voltage of the isolated converter 111 more accurately.

[0125] Optionally, the power supply module further comprises an output current sampling circuit 19.

[0126] The input end of the output current sampling circuit 19 is electrically connected to a current sampling point of the DC bus. The output end of the output current sampling circuit 19 is electrically connected to the input end of the digital controller 12.

[0127] The voltage sampling point of the DC bus can be the two ends of the output capacitor on the DC bus, such as DC+ and DC-. Figure 6 The current sampling point of the DC bus can be the positive output end of the output capacitor on the DC bus, such as DC+.

[0128] In the method provided by the embodiment, the output voltage Vdc and the output current Io of the main power topology in the power supply module can be sampled by the output voltage sampling circuit and the output current sampling circuit, and transmitted to the digital controller, so as to effectively ensure the accurate control of the input current and the output voltage of the power supply module by the digital controller.

[0129] Optionally, the embodiment of the present application can also provide another possible implementation manner of the power supply module. Figure 12 The circuit schematic of the power supply module provided by the embodiment of the present application is shown in Figure 13 . As shown in Figure 13 , the power supply module further comprises a temperature detection circuit 200, and the output end of the temperature detection circuit 200 is also electrically connected to the input end of the digital controller 12.

[0130] The temperature detection circuit 200 can be a temperature sensor, which can be arranged inside the shell of the power supply module, and can be used for detecting the environment temperature inside the power supply module and transmitting the detected environment temperature to the digital controller 12, so that the digital controller 12 sets a temperature control strategy based on the environment temperature, such as a temperature limiting strategy under high temperature, to facilitate accurate control of the power supply module under abnormal temperature conditions and ensure normal operation of the power supply module.

[0131] Optionally, the power supply module further comprises a communication interface 201. The input end of the communication interface 201 is also electrically connected to the output end of the digital controller 12. The communication interface 201 can be a communication interface supporting at least one communication mode, such as a serial communication interface (e.g., an RS485 interface) or a controller area network (CAN) interface.

[0132] The power module can interact with the host computer or the data interaction unit through the communication interface 201, has the uploading function of the sampling information, and thus realizes the remote sensing, remote signaling, remote control and other functions of the power module.

[0133] In some other possible implementation manners, the embodiment of the application can also provide a power supply system comprising the power module. ​ A circuit schematic diagram of a power supply system provided by the embodiment of the application is shown in the figure. ​ As shown in the figure, the power supply system can comprise: a plurality of DC input sources 20 and the power module 10 shown in any of the above embodiments, and the plurality of DC input sources 20 are respectively connected to the input ends of the plurality of isolation converters 111 in the power module 10. For the specific structure of the power module 10 and the description, refer to the above description, and details are not repeated here.

[0134] The above is only a specific implementation manner of the application, but the protection scope of the application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the application.

Claims

1. A power module, characterized by The power supply module comprises: a main power topology, a digital controller and a plurality of analog control circuits; wherein the main power topology comprises a plurality of isolated converters, and an input end of each isolated converter is electrically connected to a direct current input source; and output ends of the plurality of isolated converters are all electrically connected to a direct current bus; an output end of the digital controller is electrically connected to a control end of each analog control circuit respectively, so as to input a control signal to each analog control circuit; an output end of each analog control circuit is electrically connected to a primary side control end of an isolated converter, so that each analog control circuit controls the isolated converter to work based on the control signal; wherein the output end of the digital controller comprises a pulse output end, and the power supply module further comprises a plurality of given circuits; an input end of each given circuit is electrically connected to the pulse output end of the digital controller, so that each given circuit adjusts and processes a pulse control signal output by the pulse output end of the digital controller, so as to restore the pulse control signal to a direct current given signal; and an output end of each given circuit is electrically connected to a control end of an analog control circuit, so that the direct current given signal after adjustment is output to the analog control circuit; wherein each analog control circuit comprises a control chip and a current inner loop control circuit; and the control end of each analog control circuit comprises a first input end of the control chip; wherein the first input end of the control chip is electrically connected to an output end of a given circuit; the current inner loop control circuit is connected across the first input end and an output end of the control chip; and the output end of the control chip is electrically connected to a primary side control end of an isolated converter, so that the control chip generates a current control signal according to a current given signal input by the first input end under the control of the current inner loop control circuit, and outputs the current control signal to the primary side control end of the isolated converter, so as to control an input current of an input side of the isolated converter; and the current given signal is a direct current given signal of the input current corresponding to the control signal; each analog control circuit further comprises a voltage limiting voltage loop circuit; and the control end of each analog control circuit further comprises a second input end of the control chip; the second input end of the control chip is electrically connected to a voltage dividing connection point of a preset voltage dividing circuit, so as to receive a resistance voltage dividing signal of the voltage dividing connection point and take the resistance voltage dividing signal as a direct current given signal of an output voltage; and the voltage limiting voltage loop circuit is connected across the second input end and an output end of the control chip, so that the control chip generates a voltage control signal according to a voltage given signal input by the second input end under the control of the voltage limiting voltage loop circuit, and outputs the voltage control signal to the primary side control end of the isolated converter, so as to analogically limit and control an output voltage of an output side of the isolated converter; and the voltage given signal is a direct current given signal of the output voltage. The signal with a smaller amplitude in the current control signal and the voltage control signal is a target control signal, and the target control signal is output to a primary side controller of the one isolation transformer through an output end of the control chip to control the isolation transformer to realize corresponding control.

2. The power module of claim 1, wherein, The power module further comprises a plurality of input current sampling circuits, and an input end of each input current sampling circuit is electrically connected to an input current sampling point of the one isolation transformer, and an output end of the plurality of input current sampling circuits is electrically connected to an input end of the digital controller. The output end of the one input current sampling circuit electrically connected to the input current sampling point of the one isolation transformer is further electrically connected to a first input end of the control chip, so that the control chip generates and outputs the current control signal according to the current given signal and the collected input current under the control of the current inner loop control circuit.

3. The power module of claim 1, wherein, The power module further comprises an output voltage sampling circuit. The input end of the output voltage sampling circuit is electrically connected to a voltage sampling point of the DC bus, and the output end of the output voltage sampling circuit is electrically connected to an input end of the digital controller. The output end of the output voltage sampling circuit is further electrically connected to the second input end, so that the control chip generates and outputs the voltage control signal according to the voltage given signal and the sampled output voltage under the control of the voltage limiting loop circuit.

4. The power module of claim 1, wherein, The power module further comprises an auxiliary power supply, an input side capacitor and two output side capacitors. A plurality of DC input sources are respectively electrically connected to the input side capacitor through a diode, the input side capacitor is electrically connected to an input end of the auxiliary power supply, and an output end of the auxiliary power supply is respectively electrically connected to a primary side power consumption circuit and a secondary side power consumption circuit through the two output side capacitors. Among them, the primary side power consumption circuit is a power consumption circuit electrically connected to the primary side of the plurality of isolation transformers, and the secondary side power consumption circuit is a power consumption circuit electrically connected to the secondary side of the plurality of isolation transformers.

5. The power module of any one of claims 1-4, wherein, The power module further comprises an input voltage sampling circuit, a control end of the input voltage sampling circuit is electrically connected to an input and output port of the digital controller, a plurality of input ends of the input voltage sampling circuit are respectively electrically connected to a plurality of DC input sources, and an output end of the input voltage sampling circuit is electrically connected to an input end of the digital controller.

6. The power module of claim 5, wherein, The input voltage sampling circuit is a multi-channel analog gating chip, an address end of the multi-channel analog gating chip is the control end of the input voltage sampling circuit, a plurality of input ends of the input voltage sampling circuit are a plurality of analog input ends of the multi-channel analog gating chip, and an output end of the input voltage sampling circuit is an analog output end of the multi-channel analog gating chip.

7. A power supply system characterized by comprising: Comprise: A plurality of DC input sources and the power module in any one of claims 1-6, the plurality of DC input sources are respectively connected to the input ends of the plurality of isolation transformers in the power module.

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