Dual-output high-power power supply module and power supply

Abstract

The utility model discloses a dual-output high-power power supply module and a power supply, and relates to the power supply technology, and the module comprises an EMC filter circuit which is connected with a DC input; the isolation DC / DC module is connected to the rear stage of the EMC filter circuit; the current sharing circuit is arranged at the rear stage of the isolation DC / DC module with the specified voltage specification and is used for detecting the output current of the isolation DC / DC module with the specified voltage specification and adjusting the output current of the isolation DC / DC module by utilizing a feedback signal generated by output current detection; and the fault isolation circuit is arranged at the output end of the current sharing circuit, and is used for controlling the MOSFET to be switched on to serve as power supply output under the condition that the detected voltage difference is within a normal range, and controlling the MOSFET to be switched off under the condition that the detected voltage difference exceeds the normal range. According to the high-power power supply module, the high-power DC / DC converter is connected in parallel for parallel output, so that the requirement of kilowatt output power is met.

Description

Technical Field

[0001] The present application relates to the technical field of power supplies, and particularly to a high-power power supply module with dual outputs and a power supply. Background Art

[0002] High-power power supply modules can be widely used in civil and military fields such as aviation, radar, and missiles. In recent years, there has been an urgent need to develop domestic high-power power supply modules that meet actual usage requirements. Therefore, the design and reliability research of high-power power supply modules are particularly important. Summary of the Utility Model

[0003] Embodiments of the present application provide a high-power power supply module with dual outputs and a power supply, which are used to achieve an output power requirement of kilowatts through parallel output of high-power DC / DC converters.

[0004] Embodiments of the present application provide a high-power power supply module with dual outputs, including:

[0005] An EMC filtering circuit, connected to the DC input, for electromagnetic filtering of the DC input;

[0006] An isolated DC / DC module, connected to the subsequent stage of the EMC filtering circuit, including different output voltage specifications, for providing DC outputs with corresponding voltage specifications based on the filtered DC current;

[0007] A current sharing circuit, arranged at the subsequent stage of the isolated DC / DC module with a specified voltage specification, for detecting the output current of the isolated DC / DC module with the specified voltage specification and using the feedback signal generated by the output current detection to adjust the output current of the isolated DC / DC module;

[0008] A fault isolation circuit, arranged at the output end of the current sharing circuit, for detecting the voltage difference between the input and output of the power supply module. Based on the MOSFET, when the detected voltage difference is within the normal range, the MOSFET is controlled to conduct to serve as the power output. When the detected voltage difference exceeds the normal range, the MOSFET is controlled to cut off.

[0009] Optionally, an input protection circuit is further arranged between the EMC filtering circuit and the isolated DC / DC module. The input protection circuit is used to detect the input voltage. When the input is normal, the switch is fully conducted. When the input voltage exceeds the preset value, the output voltage of the MOSFET is adjusted through PWM driving, and the output voltage value is clamped within the normal input range of the subsequent DC / DC through the feedback resistor.

[0010] Optionally, the EMC filter circuit includes: a transient suppression TVS diode, a common mode inductor, a first capacitor, and a second capacitor, where: the common mode inductor, the first capacitor, and the second capacitor form an LC filter circuit for suppressing conducted interference and radiated interference.

[0011] Optionally, the isolated DC / DC module includes a main circuit and a control circuit, where:

[0012] The main circuit includes: an input filter circuit, an input soft start circuit, an inverter circuit, a transformer, and a rectifier circuit arranged in sequence;

[0013] The control circuit includes: a sampling circuit for detecting output voltage signals and current signals and feeding them back to the control circuit;

[0014] A control sub - circuit for comparing the feedback signal with a given signal to control the switching of the power devices of the inverter circuit to achieve voltage conversion;

[0015] A drive circuit for amplifying the control pulses sent by the control sub - circuit through power amplification to drive the switching devices.

[0016] Optionally, the isolated DC / DC module includes two 12V isolated DC / DCs and one 3.3V isolated DC / DC.

[0017] Optionally, the current sharing circuit is arranged on the parallel output path of the two 12V isolated DC / DCs, and the current sharing circuit includes:

[0018] A current sharing detection amplifier for detecting the voltage on the differential mode current sharing bus and using its output signal as the positive input terminal of an error amplifier;

[0019] An error amplifier for using its output voltage to adjust the output voltage of the 12V isolated DC / DC.

[0020] The embodiment of the present application also proposes a power supply, including the high - power power supply module with dual - output as described above.

[0021] The embodiment of the present application achieves the output power requirement of kilowatts through the parallel output of parallel high - power DC / DC converters.

[0022] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. Brief Description of the Drawings

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art from the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not to be considered as limiting the present application. Also, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0024] Figure 1 Schematic diagram of the overall structure of the high-power power module according to an embodiment of the present application;

[0025] Figure 2 Schematic diagram of the structure of the isolated DC / DC module of the high-power power module according to an embodiment of the present application;

[0026] Figure 3 Schematic diagram of the structure of the current sharing circuit of the high-power power module according to an embodiment of the present application;

[0027] Figure 4 Schematic diagram of the structure of the fault isolation circuit of the high-power power module according to an embodiment of the present application. Detailed implementation manners

[0028] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0029] An embodiment of the present application provides a high-power power module with dual outputs, as Figure 1 shown, including an EMC filtering circuit, an input protection circuit, a DC / DC module, a current sharing circuit, a fault isolation circuit, etc., where:

[0030] The EMC filtering circuit is connected to the DC input for electromagnetic filtering of the DC input. Specifically, the EMC filtering circuit is used to ensure that the power module can operate normally in the electromagnetic environment and does not cause unacceptable electromagnetic interference to anything in the environment.

[0031] The isolated DC / DC module is connected to the subsequent stage of the EMC filtering circuit, including different output voltage specifications, and is used to provide a DC output with a corresponding voltage specification based on the filtered DC current. In a specific example, there can be multiple paths for the isolated DC / DC module. For example, in a specific example of the present application, two 12V 600W isolated DC / DCs can be connected in parallel, and a 3.3V isolated DC / DC can also be set as needed.

[0032] A current sharing circuit is arranged at the rear stage of an isolated DC / DC module with a specified voltage specification, used to detect the output current of the isolated DC / DC module with the specified voltage specification, and use the feedback signal generated by the output current detection to adjust the output current of the isolated DC / DC module, so as to achieve the purpose of current sharing control between the output power supply units. There is a common current sharing control bus between each power supply unit.

[0033] A fault isolation circuit is arranged at the output end of the current sharing circuit, used to detect the voltage difference between the input and output of the power supply module. Based on the MOSFET, when the detected voltage difference is within the normal range, the MOSFET is controlled to conduct to serve as a power output. When the detected voltage difference exceeds the normal range, the MOSFET is controlled to cut off.

[0034] In the embodiment of the present application, the parallel output of high-power DC / DC converters is used to meet the output power requirement of kilowatts.

[0035] In some embodiments, an input protection circuit is also arranged between the EMC filtering circuit and the isolated DC / DC module. The input protection circuit is used to detect the input voltage. When the input is normal, the switch is fully conducted. When the input voltage exceeds the preset value, the output terminal voltage is adjusted by PWM driving the MOSFET, and the output voltage value is clamped within the normal input range of the subsequent DC / DC through a feedback resistor.

[0036] The EMC filtering circuit uses an electromagnetic compatibility filter. In the filter, transient components are added for voltage suppression and current discharge. By introducing a transient circuit into the electromagnetic compatibility filter, the filter can add a current discharge and voltage limiting function to its original functions.

[0037] The transient component uses a TVS diode (transient voltage suppression diode). As a commonly used highly efficient circuit protection device, when a high-energy impact occurs instantaneously at both ends of the input of the power supply module, the TVS diode changes the high impedance between its two ends into a low impedance at an extremely high speed to absorb an instantaneous large current, clamps its two ends at a predetermined value, thereby reducing the voltage generated by a strong electromagnetic pulse. Adding transient components at the end of the filter further limits the residual voltage to achieve the purpose of protecting the power supply module.

[0038] In some embodiments, the EMC filtering circuit includes: a transient suppression TVS diode, a common mode inductor, a first capacitor, and a second capacitor, where: the common mode inductor, the first capacitor, and the second capacitor form an LC filtering circuit, used to suppress conducted interference and radiated interference. Specifically, the formed LC filtering circuit mainly suppresses conducted interference and radiated interference. Its excellent differential and common mode insertion loss characteristics enable it to have good noise isolation performance, avoiding interference from noise sources to the input source and other original devices in the circuit.

[0039] In some embodiments, such as Figure 2 shown, the isolated DC / DC module includes a main circuit and a control circuit, where:

[0040] The main circuit includes: an input filter circuit, an input soft-start circuit, an inverter circuit, a transformer, and a rectifier circuit arranged in sequence. Specifically, for the main circuit part: 24V DC power passes through the input filter circuit and then through the input soft-start circuit to reduce the input inrush current, and then is supplied to the inverter circuit. After being isolated by the high-frequency transformer, it is then converted into DC output through the synchronous rectifier circuit and output as smooth and stable DC power through the output LC filter circuit.

[0041] The control circuit includes: a sampling circuit for detecting the output voltage signal and current signal and feeding them back to the control circuit.

[0042] A control sub-circuit for comparing the feedback signal with the given signal to control the switching of the power devices of the inverter circuit to achieve voltage conversion;

[0043] A drive circuit for amplifying the control pulses sent by the control sub-circuit through power amplification to drive the switching devices.

[0044] In a specific example, the control circuit uses an auxiliary power supply circuit to supply power to all control circuits. The sampling circuit detects signals such as output voltage and current and feeds them back to the control circuit; the control circuit is the core part that completes the control of the inverter circuit. By comparing the feedback signal with the given signal, through the operation of the controller, control pulses are sent to control the switching of the power devices of the inverter circuit to achieve functions such as voltage conversion and voltage stabilization; the drive circuit amplifies the control pulses sent by the control circuit through power amplification to drive the switching devices; the control circuit analyzes the signals sampled by the sampling circuit to control the power switching tubes to achieve functions such as power on / off of the power supply, output overvoltage protection, output overcurrent protection, and overheat protection.

[0045] In some embodiments, the isolated DC / DC module includes two 12V isolated DC / DCs and one 3.3V isolated DC / DC. The output power requirement of kilowatts is achieved by the parallel output of two 600W DC / DC converters.

[0046] In some embodiments, the current sharing circuit is arranged on the parallel output path of the two 12V isolated DC / DCs, and the current sharing circuit includes:

[0047] A current sharing detection amplifier for detecting the voltage on the differential-mode current sharing bus and using its output signal as the positive input terminal of the error amplifier.

[0048] An error amplifier for adjusting the output voltage of the 12V isolated DC / DC using its output voltage.

[0049] As Figure 3 shown, in the embodiments of the present application, the current sharing circuit part adopts an external circuit to control the current sharing method to achieve. An output current detection and control circuit is added to each power supply unit to detect its output current, and a feedback signal is generated by the output current detection and control circuit to adjust the output current of each power supply unit, so as to achieve the purpose of current sharing control between the output power supply units. There is a common current sharing control bus between each power supply unit.

[0050] The current sharing detection amplifier detects the voltage on the differential mode current sharing bus and takes the output signal as the positive input terminal of the error amplifier. Therefore, the output voltage of the current sharing detection amplifier corresponds to the output current of the main module, that is, to the voltage on the current sharing bus. The output voltage of the error amplifier is used to adjust the output voltage of the converter module to balance the load currents of all parallel modules, which can be specifically achieved by adjusting the amplifier and the buffer triode NPN. By adjusting the error signal output by the amplifier to drive the NPN triode, a resistor is connected between the emitter of the triode and the ground. The error signal is defined as IADJ. IADJ flows through the resistor RADJ between the ADJ pin and the positive output terminal, that is, by changing the voltage on RADJ by IADJ to adjust the output voltage of the module, so as to achieve current sharing between modules.

[0051] The fault isolation circuit, as Figure 4 shown, when the power supply module of the present application works normally, IC2 detects the voltage difference between its input and output, controls the MOSFET to conduct. When a power supply output fault occurs, IC2 can quickly turn off the MOSFET when detecting that the input and output voltage difference exceeds its preset value, preventing the faulty power supply from affecting the bus voltage value.

[0052] As Figure 1 shown, the high-power power supply module of the present application further includes a microcontroller circuit, which is used to process the data of the voltage sampling circuit and the current sampling circuit, transmit data with the upper computer through the I2C bus, and realize remote communication, monitoring and control, such as power on / off control of the power supply, output voltage, current, temperature data information, fault codes, network remote control power on / off control and reading back the power supply status information, etc.

[0053] The power supply module of the present application has a fault isolation function, automatically cuts off the faulty power supply board, and the remaining power supply boards can still work normally, ensuring normal power supply to the electrical equipment; by paralleling the outputs of two high-power DC / DC converters, the output power can reach kilowatts.

[0054] The embodiments of the present application also propose a power supply, including the high-power power supply module with dual outputs as described above.

[0055] It should be noted that in the embodiments of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0056] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.

[0057] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims. All of these are within the protection scope of the present application.

Claims

1. A high-power power supply module with dual outputs, characterized in that: include: An EMC filter circuit is connected to the DC input to perform electromagnetic filtering on the DC input; An isolated DC / DC module, connected to the rear stage of the EMC filter circuit, including different output voltage specifications, for providing a DC output of corresponding voltage specifications based on the filtered DC current; The current balancing circuit is arranged at the rear stage of the isolated DC / DC module of the specified voltage specification, and is used to detect the output current of the isolated DC / DC module of the specified voltage specification, and to adjust the output current of the isolated DC / DC module by using the feedback signal generated by the output current detection; A fault isolation circuit is arranged at the output end of the current balancing circuit to detect the voltage difference between the input and output of the power module. Based on MOSFET, when the detected voltage difference is within a normal range, the MOSFET is controlled to be turned on to serve as a power output. When the detected voltage difference exceeds the normal range, the MOSFET is controlled to be turned off.

2. The high-power power supply module with dual output as claimed in claim 1, characterized in that: An input protection circuit is also provided between the EMC filter circuit and the isolated DC / DC module. The input protection circuit is used to detect the input voltage. When the input is normal, the switch is fully turned on. When the input voltage exceeds a preset value, the output voltage is adjusted by driving the MOSFET through PWM, and the output voltage value is clamped within the normal input range of the subsequent DC / DC through a feedback resistor.

3. The high-power power supply module with dual output as claimed in claim 1, characterized in that: The EMC filter circuit includes: a transient suppression TVS diode, a common mode inductor, a first capacitor and a second capacitor, wherein: the common mode inductor, the first capacitor and the second capacitor form an LC filter circuit to suppress conducted interference and radiated interference.

4. The high-power power supply module with dual outputs as claimed in claim 1, characterized in that: The isolated DC / DC module includes a main circuit and a control circuit, wherein: The main circuit comprises: an input filter circuit, an input soft start circuit, an inverter circuit, a transformer and a rectifier circuit which are arranged in sequence; The control circuit includes: a sampling circuit for detecting output voltage signals and current signals and feeding them back to the control circuit; A control subcircuit, used for comparing the feedback signal with a given signal to control the switch of the power device of the inverter circuit to achieve voltage conversion; The driving circuit is used to drive the switching device after power amplification of the control pulse sent by the control subcircuit.

5. The high-power power supply module with dual outputs as claimed in claim 1, characterized in that: The isolated DC / DC module includes two 12V isolated DC / DCs and one 3.3V isolated DC / DC.

6. The high-power power supply module with dual outputs as claimed in claim 5, characterized in that: The current balancing circuit is arranged on the parallel output path of the two 12V isolated DC / DCs, and the current balancing circuit comprises: The current sharing detection amplifier is used to detect the voltage on the differential mode current sharing bus and use its output signal as the positive input terminal of the error amplifier; The error amplifier uses its output voltage to adjust the output voltage of the 12V isolated DC / DC.

7. A power supply, comprising the high-power power supply module with dual output as claimed in any one of claims 1 to 6.

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