CN112803778A - Power module and power system - Google Patents

Power module and power system Download PDF

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Publication number
CN112803778A
CN112803778A CN202110133345.4A CN202110133345A CN112803778A CN 112803778 A CN112803778 A CN 112803778A CN 202110133345 A CN202110133345 A CN 202110133345A CN 112803778 A CN112803778 A CN 112803778A
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CN
China
Prior art keywords
input
control
circuit
output
electrically connected
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Pending
Application number
CN202110133345.4A
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Chinese (zh)
Inventor
袁庆民
范杨平
吕剑
王立
雷艳婷
孙利辉
刘亚飞
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Xian Linchr New Energy Technology Co Ltd
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Xian Linchr New Energy Technology Co Ltd
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Publication date
Application filed by Xian Linchr New Energy Technology Co Ltd filed Critical Xian Linchr New Energy Technology Co Ltd
Priority to CN202110133345.4A priority Critical patent/CN112803778A/en
Publication of CN112803778A publication Critical patent/CN112803778A/en
Priority to DE112022000890.3T priority patent/DE112022000890T5/en
Priority to PCT/CN2022/071869 priority patent/WO2022161184A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application provides a power module and a power system, and relates to the technical field of power electronics. The power module includes: the system comprises a main power topology, a digital controller and a plurality of analog control circuits; wherein the master power topology comprises: the input end of each isolation converter is electrically connected with a direct current input source, and the output ends of the isolation converters are 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 one isolation converter. The power supply module can reduce the control cost of the power supply module, and can support the occasion of parallel connection of multiple independent converters.

Description

Power module and power system
Technical Field
The application relates to the technical field of power electronics, in particular to a power module and a power system.
Background
The switching power supply is widely applied to the occasions of aerospace, civil use, industry and the like, and along with the development of power electronic technology, higher requirements are put forward in the aspects of volume, reliability, cost and the like of power supply products.
The flyback topology is a common basic topology structure, has the characteristics of simple topology, few devices, input and output isolation and the like, but is mainly applied to low-power occasions and cannot be applied to high-power occasions. To meet the greater power demand, a parallel flyback topology, i.e., a power topology with multiple isolated converters, may be used.
However, the number of control chips for the parallel flyback topology is very small, the price is expensive, and the cost is difficult to control. Moreover, digitization is a new direction, but the resources of the digital controller are insufficient, and the situation that a plurality of independent converters are connected in parallel is difficult to support.
Disclosure of Invention
An object of the present application is to provide a power module and a power system, which are used to solve the problems of the existing power module that the control cost is high and the situation of parallel connection of multiple independent converters is not supported.
In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:
in a first aspect, an embodiment of the present application provides a power module, including: the system comprises a main power topology, a digital controller and a plurality of analog control circuits; wherein the master power topology comprises: the input end of each isolation converter is electrically connected with a direct current input source, and the output ends of the isolation converters are electrically connected with a direct current bus;
the output end of the digital controller is respectively and electrically connected with the control end of each analog control circuit so as to input a control signal to each analog control circuit;
the output end of each analog control circuit is electrically connected with the primary side control end of one isolation converter, so that each analog control circuit controls the one isolation converter to work based on the control signal.
Optionally, the power module further includes: and the input end of each given circuit is electrically connected with the output end of the digital controller, and the output end of each given circuit is electrically connected with the control end of one analog control circuit, so that each given circuit adjusts the control signal and outputs the adjusted control signal to the one analog control circuit.
Optionally, each analog control circuit includes: the control chip and the current inner loop control circuit; the control end of each analog control circuit comprises: a first input terminal of the control chip;
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 with the primary side control end of the isolation 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 isolation converter to control the input current of the input side of the isolation converter;
the current given signal is a direct current given signal of the input current corresponding to the control signal.
Optionally, the power module further includes: the input end of each input current sampling circuit is electrically connected with the input current sampling point of the isolating converter, and the output ends of the input current sampling circuits are electrically connected with the input end of the digital controller;
the output end of the input current sampling circuit electrically connected with the input current sampling point of the isolating converter is also electrically connected with 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.
Optionally, each analog control circuit further includes: and the voltage limiting ring circuit is electrically connected between the second input end and the 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 ring circuit and outputs the voltage control signal to the primary side control end of the isolation converter so as to perform analog voltage limiting control on the output voltage of the output side of the isolation converter.
Optionally, the power module further includes: an output voltage sampling circuit;
the input end of the output voltage sampling circuit is electrically connected with a voltage sampling point of the direct current bus; the output end of the output voltage sampling circuit is electrically connected with the input end of the digital controller;
the output end of the output voltage sampling circuit is also electrically connected with 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 ring circuit.
Optionally, the power module further includes: the circuit comprises an auxiliary power supply, an input side capacitor and two output side capacitors;
the plurality of direct current input sources are respectively and electrically connected with the input side capacitor through a diode, the input side capacitor is electrically connected with the input end of the auxiliary power supply, and the output end of the auxiliary power supply is respectively and electrically connected with the primary side circuit and the secondary side circuit through the two output side capacitors;
the primary side power utilization circuit is electrically connected with the primary sides of the plurality of isolation converters, and the secondary side power utilization circuit is electrically connected with the secondary sides of the plurality of isolation converters.
Optionally, the power module further includes: the control end of the input voltage sampling circuit is electrically connected with the input/output port of the digital controller, a plurality of input ends of the input voltage sampling circuit are respectively and electrically connected with a plurality of direct current input sources, and the output end of the input voltage sampling circuit is electrically connected with the input end of the digital controller.
Optionally, the input voltage sampling circuit is a multi-channel analog gating chip, an address terminal of the multi-channel analog gating chip is a control terminal of the input voltage sampling circuit, a plurality of input terminals of the input voltage sampling circuit are a plurality of analog input terminals of the multi-channel analog gating chip, and an output terminal of the input voltage sampling circuit is an analog output terminal of the multi-channel analog gating chip.
Optionally, the power module further includes: an output current sampling circuit;
the input end of the output current sampling circuit is electrically connected with a current sampling point of the direct current bus; and the output end of the output current sampling circuit is electrically connected with the input end of the digital controller.
In a second aspect, an embodiment of the present application further provides a power supply system, including: a plurality of dc input sources and the power module of any of the above first aspects, wherein the plurality of dc input sources are respectively connected to input terminals of a plurality of isolated converters in the power module.
The beneficial effect of this application is:
the power module and the power system provided by the embodiment of the application can include: the system comprises a main power topology, a digital controller and a plurality of analog control circuits; the master power topology includes: the input end of each isolation converter is electrically connected with a direct current input source, the output ends of the isolation converters are 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 respectively so as to input a control signal to each analog control circuit, and the output end of each analog control circuit is electrically connected with the primary side control end of one isolation converter, so that each analog control circuit controls one isolation converter to work based on the control signal. The power module can control the plurality of isolation converters by matching the digital controller with the plurality of analog control circuits, realizes analog-digital mixed control of a main power topology comprising the plurality of isolation converters, realizes functions of direct current input source adaptation, current control and the like by the digital controller through a flexible compatible and adaptive control algorithm, effectively reduces control cost required by energy control of the main power topology, shares the contradiction of insufficient resources of the digital controller by adopting the low-price analog control circuit, and effectively supports flexible control of a plurality of independent parallel occasions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a first schematic circuit diagram of a power module according to an embodiment of the present disclosure;
fig. 2 is a second circuit schematic diagram of a power module according to an embodiment of the present disclosure;
FIG. 3 is a circuit diagram of a given circuit according to an embodiment of the present disclosure;
fig. 4 is a first schematic diagram of an analog control circuit in a power module according to an embodiment of the present disclosure;
fig. 5 is a second schematic diagram of an analog control circuit in a power module according to an embodiment of the present disclosure;
fig. 6 is a circuit schematic diagram of an isolated converter according to an embodiment of the present application;
fig. 7 is a circuit schematic diagram of an auxiliary power module according to an embodiment of the present disclosure;
fig. 8 is a third schematic circuit diagram of a power module according to an embodiment of the present disclosure;
fig. 9 is a fourth schematic circuit diagram of a power module according to an embodiment of the present disclosure;
FIG. 10 is a circuit diagram of a multi-channel analog gating chip according to an embodiment of the present disclosure;
fig. 11 is a fifth schematic circuit diagram of a power module according to an embodiment of the present disclosure;
fig. 12 is a sixth schematic circuit diagram of a power module according to an embodiment of the present application;
fig. 13 is a circuit schematic diagram of a power supply system according to an embodiment of the present application.
Reference numerals:
11-main power topology; 12-a digital controller; 13-an analog control circuit; 111-an isolated converter; 20-a direct current input source; 112-direct current bus; 131-a control chip; 132-a current inner loop control circuit; iin _ ref-current set signal; 133-voltage limiting loop circuit; u _ ref-voltage given signal; 14-a given circuit; 141-a filter circuit; 142-an operational amplifier; cin — input capacitance; q1-first switch tube; q2-second switch tube; LA-first high frequency transformer; LB-a second high-frequency transformer; d1 — first diode; d2 — second diode; d3 — third diode; d4 — fourth diode; co1 — first output capacitance; co2 — second output capacitance; 15-an auxiliary power supply module; 151-auxiliary power supply; 152-input side capacitance; 153-output side capacitance; 16-an input current sampling circuit; iin-input current; ip _ a-secondary output; ip _ B-secondary output; vin-a dc input voltage; 17-an input voltage sampling circuit; 171-a multi-channel analog gating chip; 18-an output voltage sampling circuit; vdc-output voltage; 19-an output current sampling circuit; io-output current; 200-a temperature detection circuit; 201-a communication interface; 10-power supply module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
The power supply module and the power supply system provided by the following embodiments of the application can be applied to occasions where a plurality of direct current input sources exist and the input sources and the output need to be isolated, and are particularly suitable for a digital scene with medium power and multi-channel input independent control of input low voltage and output high voltage. For example, the method can be applied to occasions such as photovoltaics, storage batteries, fuel cells and the like. Accordingly, the plurality of dc input sources may be a plurality of photovoltaic dc input sources such as photovoltaic panels, a plurality of battery input sources, or a plurality of fuel cell input sources. In other applications, the plurality of dc input sources may be other types of dc input sources.
The embodiment of the application provides the method and the device, which can combine a digital controller and an analog control circuit to support the function control of a power module with an interleaving parallel flyback circuit, fully utilizes the advantages of good digital information interaction, good design flexibility and good stability, adopts the cheap analog control circuit to share the contradiction of insufficient resources of the digital controller, realizes the control of a plurality of isolation converters by the cooperation control of the digital controller and the analog control circuit, realizes the analog-digital mixed control of a main power topology comprising the plurality of isolation converters, realizes the flexible control function of the main power topology, and realizes the functions of direct current input source self-adaptation, current control and the like by a flexible compatible and self-adaptive control algorithm of the digital controller.
The power supply module provided by the present application is exemplified by a plurality of examples in conjunction with a circuit diagram as follows.
Fig. 1 is a first circuit schematic diagram of a power module according to an embodiment of the present disclosure, as shown in fig. 1, the power module may include: a main power topology 11, a digital controller 12, a plurality of analog control circuits 13. Wherein, the main power topology 11 includes: a plurality of isolated converters 111, each isolated converter 111 being a flyback circuit such as an interleaved parallel flyback circuit. The input end of each isolated converter 111 is electrically connected with a direct current input source 20, and the output ends of a plurality of isolated converters 111 are electrically connected with a direct current bus 112;
an output terminal of the digital controller 12 is electrically connected to a control terminal of each analog control circuit 13 to input a control signal to each analog control circuit 13. The power supply module having the plurality of isolated converters 111 may be referred to as a flyback power supply module.
The output terminal of each analog control circuit 13 is electrically connected to the primary control terminal of one isolation converter 111, so that each analog control circuit 13 controls one isolation converter 111 to operate based on the control signal.
The plurality of dc input sources 20 in the power module may be photovoltaic dc input sources, battery dc input sources, or combustion battery dc input sources, or any other form of dc input source. Each isolated converter 111 in the main power topology 11 electrically connects one dc input source 20, i.e. the main power topology 11 is a parallel scheme for a plurality of dc input sources 20. The plurality of dc input sources 20 are independent of each other. Each direct current input source is electrically connected with the input end of one isolation converter 111, so that high voltage can be output through high-frequency isolation, and the reinforced isolation of input and output, such as the reinforced insulated magnetic isolation of input and output, can be realized, so that the system is safer and more reliable. Compared with the traditional series scheme of a plurality of direct current input sources 20, the power module provided by the application is the scheme that the plurality of direct current input sources 20 are connected in parallel, and each isolation converter 111 operates independently without uniform control, so that the power module is safe and reliable. The power module, which may also be referred to as a power optimizer, may be a photovoltaic power module or a photovoltaic power optimizer, for example, if the plurality of dc input sources 20 are a plurality of photovoltaic dc input sources.
Each of the isolated converters 111 may be a direct current (DC/DC) isolated converter, i.e., a DC converter having inputs and outputs isolated from each other. Each isolated converter 111 can convert the energy of one direct current input source connected with the isolated converter 111 and output the converted energy to the output bus of each isolated converter 111. The output buses of the plurality of isolated converters 111 are each connected to a dc bus 112, which dc bus 112 may be the total dc bus inside the power module. The dc bus 112 may be electrically connected to an output load through an output capacitor to provide a dc input to the output load. The output load may be, for example, other power electronics in a stage subsequent to the power module.
The plurality of isolated converters 111 may be integrated inside the power supply module. The specific number of the isolation converters in the power supply module can be flexibly planned and configured according to preset product planning and practical application occasions. The number of the dc input sources 20 connected to the Power module is not limited, the isolated converters 111 in the Power module can adapt to various types of dc input sources, and each isolated converter 111 has an independent Maximum Power Point Tracking (MPPT). Thus, a power module with multiple isolated converters 111 may also implement MPPT functionality for multiple dc input sources.
The digital controller 12 may be a digital controller or a digital control chip, and the digital controller 12 may have a digital control function, and may convert an input digital signal based on a pre-configured control rule to generate a control signal, where the control signal may be a dc given signal, or may be a Pulse Width Modulation (PWM) signal.
Correspondingly, each analog control circuit 13 may also have an analog control function, and may 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 may be controlled based on the primary side control signal, and the analog inner loop control of the analog control circuit 13 on the isolation converter 111 is realized. Because the flyback circuit usually operates in a peak current mode, and the power module with the plurality of isolation converters 111 can realize primary side average current control of the plurality of isolation converters 111 in an analog-digital mixed control mode, realize power regulation of a main power topology, and then perform energy control of the power module.
The power module provided by the embodiment may include: the system comprises a main power topology, a digital controller and a plurality of analog control circuits; the master power topology includes: the input end of each isolation converter is electrically connected with a direct current input source, the output ends of the isolation converters are 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 respectively so as to input a control signal to each analog control circuit, and the output end of each analog control circuit is electrically connected with the primary side control end of one isolation converter, so that each analog control circuit controls one isolation converter to work based on the control signal. The power module can control the plurality of isolation converters by matching the digital controller with the plurality of analog control circuits, realizes analog-digital mixed control of a main power topology comprising the plurality of isolation converters, realizes functions of direct current input source adaptation, current control and the like by the digital controller through a flexible compatible and adaptive control algorithm, effectively reduces control cost required by energy control of the main power topology, shares the contradiction of insufficient resources of the digital controller by adopting the low-price analog control circuit, and effectively supports flexible control of a plurality of independent parallel occasions.
On the basis of the power module shown in fig. 1, the embodiment of the present application may also provide a possible example of a power module. Fig. 2 is a second circuit schematic diagram of a power module according to an embodiment of the present application, and as shown in fig. 2, on the basis of the power module shown in fig. 1, the power module may further include: and a plurality of given circuits 14, wherein an input end of each given circuit 14 is electrically connected with an output end of the digital controller 12, and an output end of each given circuit 14 is electrically connected with a control end of one analog control circuit 13, so that each given circuit 14 adjusts the control signal and outputs the adjusted control signal to one analog control circuit 13. Fig. 2 illustrates a connection path between the digital controller 12, a given circuit 14 and an analog control circuit 13, but in an actual application scenario, the given circuit 14 and the analog control circuit 13 are the same in number, and one of them is connected correspondingly.
If the control signal output by the digital controller 12 is a pulse control signal, the output terminal of the digital controller 12 outputting the control signal may be a pulse output terminal, i.e. the pulse output terminal of the digital controller 12 is electrically connected to the output terminal of each given circuit 14. In this embodiment, the pulse control signal may be used as an inner loop setting signal, and each setting circuit 14 may perform adjustment processing on the pulse control signal to restore the pulse control signal to a dc setting signal, such as a dc setting signal Iin _ ref of an input current. The adjustment process of the pulse control signal by each given circuit 14 may include, for example, a filtering process, a duty cycle adjustment process, and the like.
The power module provided in this embodiment can adjust the pulse control signal output by the pulse output terminal of the digital controller by using the given circuit under the condition that digital-to-analog conversion (DA) resources of the digital controller are insufficient, so as to restore the pulse control signal to the dc given signal, and provide the dc given signal for the control terminal of each analog control circuit, thereby ensuring the accuracy of the analog control circuit in controlling the isolation converter based on the adjusted control signal.
It should be noted that, if the control signal output by the digital controller 12 is a dc predetermined signal, in the power module, the digital controller 12 and the plurality of analog control circuits 13 may not need to be provided with a predetermined circuit, and the dc predetermined signal may be directly output to the plurality of analog control circuits 13.
If the DA resources of the digital controller are sufficient, the pulse control signal can be output through the direct current output end of the digital controller without outputting the pulse control signal through the pulse control end of the digital controller.
That is, the output terminal of the digital controller mentioned above may be a dc output terminal, and the control signal outputted by the digital controller is a dc given signal; the output end of the digital controller can also be a pulse output end, and the control signal output by the digital controller is a pulse control signal.
By way of example, one possible implementation of a given circuit is also provided as follows. Fig. 3 is a circuit schematic diagram of a given circuit according to an embodiment of the present disclosure. As shown in fig. 3, a given circuit 14 may include, for example: a filter circuit 141 and an operational amplifier 142. The filter circuit 141 may be, for example, an RC filter circuit, and includes: a filter resistor and a filter capacitor. An input terminal of the filter circuit 141 is used as an input terminal of the given circuit 14, and is electrically connected to the pulse output terminal of the digital controller 12 to receive a pulse control signal output by the digital controller 12, such as a PWM signal, which may be, for example, a PWM signal of 100 kHz. It is to be noted that the bandwidth of the filter circuit 141 in the given circuit 14 needs to be greater than or equal to the preset bandwidth threshold, i.e. not too low, to avoid too great an impact on the control loop.
The output terminal of the filter circuit 141 is electrically connected to the inverting input terminal of the operational amplifier 142, the inverting input terminal of the operational amplifier 142 is electrically connected to the output terminal of the operational amplifier 142, and the output terminal of the operational amplifier 142 can be used as the output terminal of the given circuit 14 and is electrically connected to the control terminal of the analog control circuit 13 to output the processed dc given signal thereto.
The given circuit provided in this embodiment may perform low-pass filtering on the pulse control signal through the filter circuit 141 under the condition that the digital-to-analog conversion resource of the digital controller is insufficient, restore the pulse control signal to the dc quantity, i.e., the dc given signal, through the follower circuit of the operational amplifier 142 by adjusting the duty ratio of the signal, and output the dc given signal obtained after the adjustment to the control terminal of the analog control circuit 13, so that the analog control circuit 13 controls the isolation converter 111 according to the input dc given signal.
On the basis of the power module provided by the above embodiment, the embodiment of the present application further provides an internal structure of an analog control circuit, so as to implement inner loop control of the input current of the isolated converter. Fig. 4 is a first schematic diagram of an analog control circuit in a power module according to an embodiment of the present disclosure. As shown in fig. 4, each of the analog control circuits 13 shown above includes: control chip 131, current inner loop control circuit 132. The control terminal of each analog control circuit 13 may include: a first input of the control chip 131.
The first input terminal of the control chip 131 can serve as a control terminal of each analog control circuit 13 to receive an input current given signal, the current inner loop control circuit 132 is electrically connected between the first input terminal and the output terminal of the control chip 131, and the output terminal of the control chip 131 serves as an output terminal of each analog control circuit 13 and is electrically connected to a primary side control terminal of one isolation converter 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 terminal under the control of the current inner loop control circuit 132, and outputs the current control signal to the primary side control terminal of one isolation converter to control the input current at the input side of one isolation converter 111.
The current setting signal is a dc setting signal of the input current corresponding to the control signal output by the digital controller 12, or may be a dc setting signal restored by the above-mentioned setting circuit.
In one example, the first input terminal of the control chip 131 may be electrically connected to the first dc output terminal of the digital controller 12 to receive the dc given signal of the input current output by the digital controller 12. That is, the dc given signal of the input current may be a control signal directly output from the dc output terminal of the digital controller 12.
In another example, the first input terminal of the control chip may be electrically connected to the output terminal of the given circuit to receive a given signal of the input current obtained after the given circuit processes the control signal output by the digital controller. That is, the dc given signal of the input current may be a control signal output from the pulse output terminal of the digital controller 12, and a signal processed by a given circuit.
The current inner loop control circuit 132 is connected across the first input terminal and the output terminal of the control chip 131, so that the control chip 131 generates a current control signal based on a dc given signal of an input current under the control of the current inner loop control circuit 132, and performs given control on the input current of the isolation converter 111 connected thereto according to the current control signal, so that the isolation converter 111 can operate based on an input current given amount corresponding to the current control signal, thereby realizing average control of the input current of the plurality of isolation converters 111 in the main power topology, and realizing control of the plurality of isolation converters 111 based on an average current mode.
For example, the control chip 131 may be a TL494 control chip, and a current inner loop control circuit is obtained by configuring a corresponding peripheral circuit, so as to implement control of the current inner loop.
Taking TL494 as an example of a control chip, two operational amplifiers are integrated in the control chip 131, and the control chip 131 may have two sets of input terminals, where the first input terminal in this embodiment may be any one of the two sets of input terminals. The two sets of inputs may be one set of 1 pin, 2 pin, and the other set of 15 pin and 16 pin. The output end of the control chip 131 may be a 3-pin output end, that is, the output end of two operational amplifiers is a common output end, and the output logic of the two operational amplifiers is two-way amplification processing. The control chip 131 can amplify the dc predetermined signal of the input current under the control of the current inner loop control circuit 132 to obtain the current control signal.
In addition, the control chip 131 has a power supply, a reference voltage, an oscillator, and two configurable driving outputs, through which an output form of 180 degrees staggered or a parallel output form can be realized.
The control chip 131 surrounds two operational amplifier configuration current inner-loop control circuits 132. The input current given signal is amplified by the operational amplifier in the control chip 131, and then generates and outputs a current control signal to control the primary side control end of the corresponding isolation converter 111 according to the current control signal, so that the control of the input current of the isolation converter 111 is realized, and the input current of the primary sides of the plurality of isolation converters 111 is averaged, that is, the average current of the primary sides.
The power supply module provided in this embodiment can realize control of the current at the input side of the isolated converter, that is, the input current at the primary side, based on the dc given signal of the input current through the cooperation of the control chip and the current inner loop control circuit, so that the input currents of the plurality of isolated converters 111 are averaged, and control of the plurality of isolated converters 111 based on the average current mode is realized.
Optionally, an internal structure of the model control circuit may be further provided in an embodiment of the present application, so as to implement voltage limiting control on the output voltage of the isolated converter. Fig. 5 is a second schematic diagram of an analog control circuit in a power module according to an embodiment of the present disclosure. As shown in fig. 5, each analog control circuit 13 further includes: and the voltage limiting ring circuit 133 is electrically connected between the second input end and the output end of the control chip 131, so that the control chip 131 generates a voltage control signal according to a voltage given signal input by the second input end under the control of the voltage limiting ring circuit 133, and outputs the voltage control signal to the primary side control end of one isolation converter 111, so as to perform analog voltage limiting control on the output voltage of the output side of the one isolation converter 111.
The voltage setting signal U _ ref may be a dc setting signal of the output voltage. The control chip 131 can obtain and output a voltage control signal after performing operational amplification on the input voltage setting signal under the control of the voltage limiting loop circuit 133.
In one example, the control terminal of each analog control circuit 13 further includes: a second input of the control chip 131. A second input terminal of the control chip 131, which serves as another control terminal of each analog control circuit 13, is electrically connected to the second dc output terminal of the digital controller 12 to receive the dc given signal of the output voltage output by the digital controller 12, i.e., the dc given signal. In this example, the given value of the output voltage corresponding to the voltage given signal is determined by a digital controller.
In another example, the second input terminal of the control chip 131 may 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 use the resistance voltage dividing signal as a dc given signal of the output voltage. In this other 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.
The voltage limiting ring circuit 133 is connected across the second input terminal and the output terminal of the control chip 131, so that the control chip 131 generates a voltage control signal based on a voltage given signal under the control of the voltage limiting ring circuit 133, and performs given control on 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 analog voltage limiting control of the output voltages of the plurality of isolation converters 111 in the main power topology.
Continuing with the TL494 control chip as an example, the periphery of the control chip 131 is also configured with a voltage limiting loop circuit 133 around the two amplifiers. The second input terminal of the control chip 131 may be another input terminal between the two input terminals.
The input voltage given signal is amplified by the control chip 131 to generate a voltage control signal, and the voltage control signal is output to the primary side control end of the isolation converter 111, so as to control the output voltage of the corresponding isolation converter 111 to perform voltage limiting control based on the voltage control signal.
It should be noted that the analog voltage limiting value corresponding to the voltage control signal may exceed the preset voltage range of the digital voltage limiting value of the voltage given signal.
In the power module provided in this embodiment, the voltage limiting ring circuit in each analog control circuit and the output voltage limiting ring of the digital controller (not described in detail herein) act together to implement dual voltage limiting protection on the output voltage of the isolation converter, and the voltage uncontrollable caused by sudden load change is prevented through digital and analog two defensive lines.
It should be noted that, in the power module provided in this embodiment, the output end of the control chip 131 in each analog control circuit can output a current control signal under the control of the current inner loop control circuit 132, and can also output a 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, may determine which control signal is finally output in a preset dependent manner. For example, taking a small dependence manner as an example, the signal with a small amplitude in the current control signal and the voltage control signal may be used as a target control signal and output to the primary controller of the isolation converter through the output terminal of the control chip 131, so as to control the isolation converter 111 to implement corresponding control. For example, if the current control signal is the target control signal, the input current of the isolated converter 111 may be controlled based on the current control signal; if the voltage control signal is the target control signal, the output voltage of the isolated converter 111 can be controlled.
In another example, the embodiments of the present application may also provide a possible implementation manner of the isolated converter. Fig. 6 is a circuit schematic diagram of an isolated converter according to an embodiment of the present application. As shown in fig. 6, the isolated converter 111 may include: the high-frequency transformer comprises an input capacitor Cin, a first switch tube Q1, a second switch tube Q2, a first high-frequency transformer LA, a second high-frequency transformer LB, two transformers, four diodes such as a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and two output capacitors such as a first output capacitor Co1 and a second output capacitor Co 2.
Two ends of the input capacitor Cin are respectively and electrically connected with two ends of a direct current input voltage Vin, and the positive pole of the direct current input voltage Vin is respectively connected with one primary side input end of two transformers; the first switch transistor Q1 and the second switch transistor Q2 are Metal Oxide Semiconductor field effect transistors (MOS), such as NMOS transistors. The source of the first switching tube Q1 and the source of the second switching tube Q2 are electrically connected to the other primary input ends of the two transformers respectively. The gate of the first switching transistor Q1 and the gate of the second switching transistor Q2 can be used as primary control terminals of the isolated converter 111, and of the signals output by the analog control circuit 13, the first control signal PWMA and the second control signal PWMB can be output to the gate of the first switching transistor Q1 and the gate of the second switching transistor Q2, respectively.
The drain electrode of the first switch tube Q1 and the drain electrode of the second switch tube Q2 are further connected to the primary side input end of the first high-frequency transformer LA and the primary side input end of the second high-frequency transformer LB, respectively. The other primary side input end of the first high-frequency transformer LA and the other primary side input end of the second high-frequency transformer LB are both grounded. Thus, the primary sides for the two transformers are interleaved in parallel. The first high-frequency transformer LA and the second high-frequency transformer LB may be, for example, 1:200 high-frequency transformers.
Each transformer is provided with two secondary side output ends which are connected in series, and the two secondary side output ends of each transformer are electrically connected with a diode and an output capacitor respectively. For example, two secondary output terminals 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. Two secondary side output ends of the other transformer are electrically connected with a first output capacitor Co1 and a second output capacitor Co2 through a third diode D3 and a fourth diode D4 respectively.
For the secondary side of each transformer, the two output ends are connected in series, and different transformers are connected with the output capacitor in parallel, so that the secondary sides of the two transformers are connected in series and then connected in parallel in a staggered mode, the secondary sides are staggered by 180 degrees, 2-frequency multiplication is equivalent, and the stress of input and output devices can be reduced.
The voltage sharing can be automatically realized through two output capacitors in the isolated converter 111. The isolation converter can be operated in a predetermined duty ratio, for example, in a Discontinuous Conduction Mode (DCM) with a duty ratio less than 0.5, or in another Mode, by the first control signal PWMA and the second control signal PWMB input to the gate of the first switching transistor Q1 and the gate of the second switching transistor Q2. The preset duty ratio may be, for example, the duty ratio of the control signal output by the analog control circuit 13 to the isolated converter 111.
In the main power topology 11, an input capacitor Cin, a first output capacitor Co1 and a second output capacitor Co2 in one isolation converter 111 can all adopt film capacitors, so that the safety and reliability are high, and the service life is long. For example, in the DCM mode, the output voltage depends only on the load resistance and the input power, and the transformer ratio parameter is designed to meet the stress condition, so that the high voltage can be easily output. The low-voltage side current is large, a plurality of switch tubes are connected in parallel to reduce on-state resistance, the output side voltage is low in high current, the oscillation amplitude is large, and a silicon carbide diode or a fast recovery diode with excellent performance can be adopted.
In some other possible implementations, the embodiments of the present application may also provide an implementation example of a power supply module, which is described below in conjunction with an auxiliary power supply to supply power to circuits in the power supply module. Fig. 7 is a circuit schematic diagram of an auxiliary power module according to an embodiment of the present disclosure. As shown in fig. 7, the power supply module as shown above may further include: and an auxiliary power supply module 15. The auxiliary power supply module 15 may include: an auxiliary power supply 151, an input side capacitor 152, and two output side capacitors 153. The auxiliary power supply 151 may be a single auxiliary power supply chip, or may be an auxiliary power supply of another form.
The plurality of dc input sources 20 are electrically connected to the input side capacitor 152 through a diode, the input side capacitor 152 is electrically connected to the input terminal of the auxiliary power supply 151, and the output terminal of the auxiliary power supply 151 is electrically connected to the primary side circuit and the secondary side circuit through two output side capacitors 153, respectively.
The primary side circuit is an electric circuit electrically connected to the primary sides of the plurality of isolation converters 111, and the secondary side circuit is an electric circuit electrically connected to the secondary sides of the plurality of isolation converters 111.
The plurality of direct current input sources 20 are electrically connected with the input side capacitor 152 through a diode respectively, so that the plurality of direct current input sources 20 are connected in parallel in an 'OR' mode, the direct current input source with the maximum voltage in the plurality of direct current input sources 20 provides input for the auxiliary power supply 151, and the normal operation of the auxiliary power supply 151 can be ensured as long as any one direct current input source in the plurality of direct current input sources 20 is electrified. The voltage across the input side capacitor 152, i.e., the input voltage of the auxiliary power supply 151, is the maximum voltage of the plurality of dc input sources 20.
Two output ends of the auxiliary power supply 151 are respectively connected with two output side capacitors 153, so that the two output voltages are isolated. The first voltage V1 output by the auxiliary power supply 151 may be a voltage across one output-side capacitor 153, and the second voltage V2 output by the auxiliary power supply 151 may be a voltage across the other output-side capacitor 153.
These two output side electric capacity 153 can connect electric primary side power consumption circuit and secondary side power consumption circuit respectively to the mode of keeping apart carries out independent power supply for primary side power consumption circuit and secondary side power consumption circuit, and the primary power topology divides into primary side and secondary side through isolating transformer, and then the power supply of primary side and secondary side also need keep apart. For example, the first voltage V1 may be output to the primary-side circuit, and the second voltage V2 may be output to the secondary-side circuit.
The primary-side circuit is a circuit electrically connecting the primary sides of the plurality of isolation converters 111, and is connected to, for example, the digital controller 12, the analog control circuit 13, and a primary-side sampling circuit, such as an input current sampling circuit and an input voltage sampling circuit.
The secondary-side circuit is a circuit electrically connecting the secondary sides of the plurality of isolated converters 111, and is connected to, for example, a primary-side output voltage sampling circuit, an output current sampling circuit, and the like.
Of course, the supply voltage required by the primary-side electric circuit and the secondary-side electric circuit may not be one voltage. For example, one of the primary-side power consumption circuits has a power supply voltage of 12V, the other power consumption circuit has a power supply voltage of 5V, and the other power consumption circuit has a power supply voltage of 3.3V. Therefore, a corresponding power conversion circuit may be further connected between each output-side capacitor 153 and the corresponding power utilization circuit, so as to convert the voltage output by the output-side capacitor 153 into a corresponding power supply voltage, thereby meeting the power supply requirement.
The power module provided by this embodiment can be obtained by connecting a plurality of dc input sources 20 in parallel in an or manner, and the dc input source with the maximum voltage among the plurality of dc input sources provides an input for the auxiliary power source, so long as any one dc input source is powered, the normal operation of the auxiliary power source can be ensured.
Optionally, the embodiments of the present application may also provide possible implementations of the power supply module. Fig. 8 is a third circuit schematic diagram of a power module according to an embodiment of the present application. As shown in fig. 8, the power module may further include: and a plurality of input current sampling circuits 16, wherein the input end of each input current sampling circuit 16 is electrically connected with the input current sampling point of one isolation converter 111, and the output ends of the plurality of input current sampling circuits 16 are electrically connected with the input end of the digital controller 12.
An output terminal of the input current sampling circuit 16, to which an input current sampling point of the isolated converter 111 is electrically connected, is electrically connected to a first input terminal of the control chip 131, so that the control chip 131 generates and outputs a current control signal according to the current given signal Iin _ ref and the collected input current Iin under the control of the current inner loop control circuit 132.
The control chip generates and outputs a current control signal based on the input current given signal and the acquired input current, and can realize loop control of the input current of the corresponding isolation converter 111, so that the analog control circuit 13 can control the input current of the isolation converter 111 more accurately.
It should be noted that, although fig. 8 illustrates one connection path among the digital controller 12, one input current sampling circuit 16, and one analog control circuit 13, in an actual application scenario, as for the number of the plurality of input current sampling circuits 16 and the isolation converters 111, the input terminals thereof may be electrically connected to the input current sampling points of the corresponding isolation converters 111, and the output terminals thereof may be electrically connected to the input terminals of the analog control circuits 13 of the corresponding isolation converters 111.
The input current sampling point of each isolation converter 111 may be a current sampling point on the primary side of each isolation converter 111 in the main power topology 11, that is, a current sampling point of a switching tube on the primary side of the isolation converter 111, for example, a secondary side output end Ip _ a of a first high-frequency transformer LA and a secondary side output end Ip _ B of a second high-frequency transformer LB in the isolation converter 111 shown in fig. 6. The input end of each input current sampling circuit 16 is electrically connected to an input current sampling point of the isolation converter 111, so that the currents of the first switch tube Q1 and the second switch tube Q2 on the primary side of the isolation converter 111 can be sampled.
The input end of the input current sampling circuit 16 is electrically connected to the current sampling point on the primary side of each isolation converter 111, such as the secondary output end Ip _ a of the first high-frequency transformer LA and the secondary output end Ip _ B of the second high-frequency transformer LB, so that the dc pulse sampling of the switching tube current in the isolation converter 111 can be realized.
The input currents on the primary sides of the plurality of isolation converters are sampled by the plurality of input current sampling circuits 16 and output to the analog control circuit 13 and the digital controller 12, so that the analog control circuit 13 and the digital controller 12 can accurately control the power of the power supply module.
By way of example, each of the input current sampling circuits 16 described above may include: the input end of each input current sampling circuit 16 is the anode of the two first diodes, and the input current sampling point of each isolation converter 111 is the current sampling point of two switching tubes in each isolation converter 111;
the anodes of the two first diodes are respectively and electrically connected with the current sampling points of the two switching tubes, the cathodes of the two first diodes are electrically connected with one end of a sampling resistor, and the other end of the sampling resistor is the output end of each input current sampling circuit.
In the input current sampling circuit provided in this embodiment, the current sampling points of the two switching tubes in each isolation converter 111 may be converted into voltage signals by pulse triangular wave current signals output by the diodes through the sampling resistors, the sampling voltages are double-frequency interleaved triangular waves, and the voltage signals are filtered, such as RC low-frequency filtering, to approximate dc, and then are transmitted to the input ends of the analog control circuit and the digital controller, so as to ensure accurate control of the input power supply.
Optionally, the embodiments of the present application may also provide possible implementations of the power supply module. Fig. 9 is a fourth schematic circuit diagram of the power module according to the embodiment of the present application. As shown in fig. 9, the power module may further include: the control end of the input voltage sampling circuit 17 is electrically connected with the input/output port of the digital controller 12, a plurality of input ends of the input voltage sampling circuit 17 are respectively electrically connected with a plurality of direct current input sources 20, and an output end of the input voltage sampling circuit 17 is electrically connected with the input end of the digital controller 12.
The input voltage sampling circuit 17 may have a plurality of input terminals, and an output terminal, and the voltage sampling of the plurality of dc input sources 20 is realized by time-sharing sampling. The digital controller 12 may output a gating control signal to a control terminal of the input voltage sampling circuit 17 through an input/output port (IO port), and the input voltage sampling circuit 17 may control communication between an input terminal and an output terminal connected to a target dc input source based on the gating control signal, so as to implement voltage sampling of the target dc input source. The gating control signal may be, for example, an address gating signal corresponding to the target dc input source.
As explained below by way of one possible example of an input voltage sampling circuit, such as the multiplexed analog gating chip. Fig. 10 is a circuit schematic diagram of a multi-channel analog gating chip according to an embodiment of the present application. As shown in fig. 10, the address terminal of the multi-channel analog gating chip 171 is the control terminal of the input voltage sampling circuit 17, the plurality of input terminals of the input voltage sampling circuit 17 are the plurality of analog input terminals of the multi-channel analog gating chip 171, and the output terminal of the input voltage sampling circuit 17 is the analog output terminal of the multi-channel analog gating chip 171.
In this example, a multi-channel analog strobe chip 171 is used as an input voltage sampling circuit, and an 8-channel analog strobe chip is taken as an example in fig. 10. The number of analog input ends of the multi-path analog gating chip 171 can be at least greater than or equal to the number of direct current input sources connected to the power supply module.
The address pin S0S 1S 2 of the multi-channel analog strobe chip 171 can be used as the control terminal of the input voltage sampling circuit 17, receives the digital strobe address output by the digital controller 12, and can realize 8-channel strobe from the address 000-address 111. Each address may correspond to a dc input source. Taking the address 001 as an example, the analog input terminal a1 in the multi-channel analog gating chip 171 can be connected to the analog output terminal a, and the sampled voltage Vinx is the input voltage of the dc input source, such as Vin2, to which the analog input terminal a1 is connected.
In the power module provided in this embodiment, the voltages of the plurality of dc input sources may be sampled in a time-division multiplexing manner through the input voltage sampling circuit 17, so that time-division sampling of the plurality of input voltages is realized, and a contradiction that a digital-to-analog (DA) conversion resource of the digital controller is insufficient or a cost of an external ad converter is high is effectively solved. Since it takes a certain time to sample the voltage of one dc input source, the holding time of the interval between two adjacent dc input sources can be determined in advance based on the control time accuracy of the power module.
Optionally, the embodiments of the present application may also provide possible implementations of the power supply module. Fig. 11 is a fifth circuit schematic diagram of the power module according to the embodiment of the present application. As shown in fig. 11, 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 with a voltage sampling point of the direct current bus; the output end of the output voltage sampling circuit 18 is electrically connected with the input end of the digital controller 12;
the output terminal of the output voltage sampling circuit 18 is also electrically connected to the second input terminal of the control chip 131, so that the control chip 131 generates and outputs a voltage control signal according to the voltage given signal U _ ref and the sampled output voltage Vdc under the control of the voltage limiting ring circuit 133.
The output end of the output voltage sampling circuit 18 is further 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 isolation converter 111 based on the voltage given signal and the sampled output voltage, and the analog control circuit 13 can control the output voltage of the isolation converter 111 more accurately.
Optionally, the power module further includes: and an output current sampling circuit 19.
The input end of the output current sampling circuit 19 is electrically connected with the current sampling point of the direct current bus. An output terminal of the output current sampling circuit 19 is electrically connected to an input terminal of the digital controller 12.
The voltage sampling point of the DC bus may be two ends of the output capacitor on the DC bus, such as DC + and DC + in fig. 1, and the current sampling point of the DC bus may be a positive output end of the output capacitor on the DC bus, such as DC +.
In the method provided by this embodiment, the output voltage Vdc and the output current Io of the main power topology in the power supply module may be sampled by the output voltage sampling circuit and the output current sampling circuit, and transmitted to the digital controller, thereby effectively ensuring accurate control of the input current and the output voltage of the power supply module by the digital controller.
Optionally, the embodiment of the present application may also provide another possible implementation manner of the power supply module. Fig. 12 is a sixth schematic circuit diagram of a power module according to an embodiment of the present application. As shown in fig. 12, the power supply module further includes: the output end of the temperature detection circuit 200 is also electrically connected with the input end of the digital controller 12.
Temperature detect circuit 200 can be temperature sensor, can set up inside power module's casing, can be used to detect the inside ambient temperature of power module to transmit the ambient temperature who detects to digital controller 12, make digital controller 12 set up the temperature control strategy based on this ambient temperature, like temperature restriction strategy etc. under the high temperature, be convenient for carry out accurate control to power module in the abnormal temperature condition, guarantee power module's normal work.
Optionally, the power module further includes: a communication interface 201. The input of the communication interface 201 is also electrically connected to the output of the digital controller 12. The communication interface 201 may be a communication interface supporting at least one communication mode, for example, a serial communication interface such as an RS485 interface, or a Controller Area Network (CAN) interface.
The power module can perform information interaction with an upper computer or a data interaction unit through the communication interface 201, and has the function of uploading sampled information, so that the functions of remote sensing, remote signaling, remote control and the like of the power module are realized.
In other possible implementations, the embodiment of the present application may also provide a power supply system including the power supply module. Fig. 13 is a circuit schematic diagram of a power supply system according to an embodiment of the present application. As shown in fig. 13, the power supply system may include: the power module 10 of any one of the embodiments is provided, and the plurality of dc input sources 20 are respectively connected to the input terminals of the plurality of isolated converters 111 in the power module 10. For the specific structure and description of the power module 10, reference may be made to the above description, and the detailed description is omitted here.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the present application.

Claims (10)

1. A power module, comprising: the system comprises a main power topology, a digital controller and a plurality of analog control circuits; wherein the master power topology comprises: the input end of each isolation converter is electrically connected with a direct current input source, and the output ends of the isolation converters are electrically connected with a direct current bus;
the output end of the digital controller is respectively and electrically connected with the control end of each analog control circuit so as to input a control signal to each analog control circuit;
the output end of each analog control circuit is electrically connected with the primary side control end of one isolation converter, so that each analog control circuit controls the one isolation converter to work based on the control signal.
2. The power module of claim 1, further comprising: and the input end of each given circuit is electrically connected with the output end of the digital controller, and the output end of each given circuit is electrically connected with the control end of one analog control circuit, so that each given circuit adjusts the control signal and outputs the adjusted control signal to the one analog control circuit.
3. The power module of claim 1, wherein each analog control circuit comprises: the control chip and the current inner loop control circuit; the control end of each analog control circuit comprises: a first input terminal of the control chip;
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 with the primary side control end of the isolation 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 isolation converter to control the input current of the input side of the isolation converter;
the current given signal is a direct current given signal of the input current corresponding to the control signal.
4. The power module of claim 3, further comprising: the input end of each input current sampling circuit is electrically connected with the input current sampling point of the isolating converter, and the output ends of the input current sampling circuits are electrically connected with the input end of the digital controller;
the output end of the input current sampling circuit electrically connected with the input current sampling point of the isolating converter is also electrically connected with 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.
5. The power module of claim 3, wherein each analog control circuit further comprises: and the voltage limiting ring circuit is electrically connected between the second input end and the 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 ring circuit and outputs the voltage control signal to the primary side control end of the isolation converter so as to perform analog voltage limiting control on the output voltage of the output side of the isolation converter.
6. The power module of claim 5, further comprising: an output voltage sampling circuit;
the input end of the output voltage sampling circuit is electrically connected with a voltage sampling point of the direct current bus; the output end of the output voltage sampling circuit is electrically connected with the input end of the digital controller;
the output end of the output voltage sampling circuit is also electrically connected with 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 ring circuit.
7. The power module of claim 1, further comprising: the circuit comprises an auxiliary power supply, an input side capacitor and two output side capacitors;
the plurality of direct current input sources are respectively and electrically connected with the input side capacitor through a diode, the input side capacitor is electrically connected with the input end of the auxiliary power supply, and the output end of the auxiliary power supply is respectively and electrically connected with the primary side circuit and the secondary side circuit through the two output side capacitors;
the primary side power utilization circuit is electrically connected with the primary sides of the plurality of isolation converters, and the secondary side power utilization circuit is electrically connected with the secondary sides of the plurality of isolation converters.
8. The power module as claimed in any one of claims 1-7, further comprising: the control end of the input voltage sampling circuit is electrically connected with the input/output port of the digital controller, a plurality of input ends of the input voltage sampling circuit are respectively and electrically connected with a plurality of direct current input sources, and the output end of the input voltage sampling circuit is electrically connected with the input end of the digital controller.
9. The power supply module of claim 8, wherein the input voltage sampling circuit is a multi-channel analog gating chip, the address terminal of the multi-channel analog gating chip is the control terminal of the input voltage sampling circuit, the plurality of input terminals of the input voltage sampling circuit are the plurality of analog input terminals of the multi-channel analog gating chip, and the output terminal of the input voltage sampling circuit is the analog output terminal of the multi-channel analog gating chip.
10. A power supply system, comprising: a power supply module as claimed in any one of claims 1 to 9 and a plurality of dc input sources respectively connected to the input terminals of a plurality of isolated converters in the power supply module.
CN202110133345.4A 2021-01-29 2021-01-29 Power module and power system Pending CN112803778A (en)

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CN202110133345.4A CN112803778A (en) 2021-01-29 2021-01-29 Power module and power system
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PCT/CN2022/071869 WO2022161184A1 (en) 2021-01-29 2022-01-13 Power source module and power source system

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