Direct / direct high-power high-efficiency conversion module

Abstract

The utility model discloses a direct / direct high-power high-efficiency conversion module, which comprises a power part, a sampling feedback part and a protection part, the power part comprises an MOS (Metal Oxide Semiconductor) tube, an operational amplifier and a negative temperature coefficient thermistor; the sampling feedback part comprises an MOS tube voltage sampling feedback circuit and an MOS tube current sampling feedback circuit; the protection part comprises an over-current protection circuit, an over-voltage protection circuit, an under-voltage protection circuit and an over-temperature protection circuit. According to the utility model, the universal, serialized and combined (modularized) principle is followed, the expansibility is strong, the output can be connected with inductive load equipment, capacitive load equipment and the like, the functions of over-current and over-voltage protection, under-voltage protection and over-temperature protection are realized, the structural design is simple, the assembly is convenient, and a certain anti-seismic grade and flame-retardant grade are met. The high-power linear voltage limiting circuit is applied to high-power linear voltage limiting of vehicle-mounted direct current power supply, and the problem of high-efficiency conversion of direct / direct high power is effectively solved.

Description

Technical Field

[0001] The utility model relates to an application technology of vehicle-mounted battery power supply and DC 28V silicon generator power supply, and in particular to a DC / DC high-power high-efficiency conversion module, which can be applied to low-voltage high-power power supply circuits, has high efficiency and small size. Background Art

[0002] The on-board power supply and distribution system mainly consists of AC power, diesel engine, power take-off generator, silicon generator and battery pack to realize uninterrupted power supply for power conversion and power distribution. The power conversion technology of AC / DC power supply and distribution is relatively mature, while the requirements for high-efficiency conversion technology of DC / DC high power are getting higher and higher, especially in the use environment of relatively small size and high power, which requires high conversion efficiency, strong impact resistance, full protection ability, and stable and reliable design.

[0003] It is difficult for existing technologies to solve the problem of high-efficiency conversion of DC / DC high power.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a high-efficiency direct / direct high-power conversion module to solve the above technical problems existing in the prior art.

[0006] The direct / direct high-power high-efficiency conversion module of the utility model comprises a power part, a sampling feedback part, and a protection part;

[0007] The power part includes: a MOS tube, an operational amplifier and a negative temperature coefficient thermistor;

[0008] The sampling feedback part includes: a MOS tube voltage sampling feedback circuit and a MOS tube current sampling feedback circuit;

[0009] The protection part includes: an overcurrent protection circuit, an overvoltage protection circuit, an undervoltage protection circuit and an overtemperature protection circuit.

[0010] Compared with the prior art, the high-efficiency DC / DC high-power conversion module provided by the utility model is applied to high-power linear voltage limiting of vehicle-mounted DC power supply, effectively solving the problem of high-efficiency DC / DC high-power conversion.

[0011] This DC / DC high-power high-efficiency conversion module follows the principles of generalization, serialization, and combination (modularization), has strong scalability, uses domestically produced devices, and the output can be connected to inductive loads, capacitive loads and other equipment. It has over-current, over-voltage protection, under-voltage protection, and over-temperature protection functions. The structural design is simple, the assembly is convenient, and it meets certain seismic resistance and flame retardant levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The electrical schematic diagram of the high-efficiency direct / direct high-power conversion module provided by the embodiment of the utility model;

[0013] Figure 2 This is a connection diagram for implementing the high efficiency conversion of direct / direct high power in the utility model;

[0014] Figure 3 This is a MOS tube voltage feedback circuit diagram for implementing the utility model;

[0015] Figure 4 This is a circuit diagram of MOS tube current feedback for implementing the utility model. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, which does not constitute a limitation of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0017] First, the terms that may be used in this article are explained as follows:

[0018] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0019] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0020] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0021] The contents not described in detail in the examples of the present utility model belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present utility model, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments used in the examples of the present utility model are not specified, they are all conventional products that can be purchased commercially.

[0022] The direct / direct high-power high-efficiency conversion module of the utility model comprises a power part, a sampling feedback part, and a protection part;

[0023] The power part includes: a MOS tube, an operational amplifier and a negative temperature coefficient thermistor;

[0024] The sampling feedback part includes: a MOS tube voltage sampling feedback circuit and a MOS tube current sampling feedback circuit;

[0025] The protection part includes: an overcurrent protection circuit, an overvoltage protection circuit, an undervoltage protection circuit and an overtemperature protection circuit.

[0026] Four MOS tubes with similar Q values ​​form a parallel combination, DC 28V is connected to the D poles of the four MOS tubes, the operational amplifier is connected to the G poles of the four MOS tubes, the S poles of the four MOS tubes are connected to a negative temperature coefficient thermistor, and the negative temperature coefficient thermistor is connected to a direct output load.

[0027] The MOS tube is a MMN360J75U MOS tube with a conduction current of 360A and a withstand voltage of 750V;

[0028] The operational amplifier uses the EG393 dual independent high-precision voltage comparator chip;

[0029] The negative temperature coefficient thermistor is a 20Ω power NTC thermistor.

[0030] The module is integrated on the control board and encapsulated by a shell on the outside.

[0031] After testing, four MOS tubes with similar Q values ​​are selected to form a parallel combination. When the voltage flows into the D pole of the MOS tube, it is collected and compared through the operational amplifier and the negative temperature coefficient thermistor. When the detection input is greater than 25.2V, the MOS tube enters the linear region, which is analogous to a resistor, dividing the energy of the output greater than 25.2V. When the input is less than 25.2V, the MOS tube enters the conduction region, and the output follows the input voltage.

[0032] In summary, the high-efficiency DC / DC high-power conversion module of the embodiment of the utility model is mainly composed of a MOS tube, a voltage sampling circuit, a current sampling circuit, a feedback circuit and a protection circuit. It has overcurrent, overvoltage protection, undervoltage protection, and overtemperature protection functions, has a simple structural design, is easy to assemble, and meets certain seismic resistance and flame retardancy levels.

[0033] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0034] Example 1

[0035] like Figure 1 , Figure 2 As shown:

[0036] It includes a power part, a sampling feedback part, and a protection part, which are integrated on a control board and encapsulated by a shell on the outside.

[0037] 1. The power part includes:

[0038] MOS tubes, operational amplifiers, negative temperature coefficient thermistors, etc.:

[0039] The MOS tube design uses the MMN360J75U of Jiangsu Hongwei Technology Co., Ltd. The on-state current of this MOS tube is 360A and the withstand voltage resistance is 750V, which meets the power supply requirements of vehicle-mounted equipment;

[0040] The operational amplifier uses the EG393 dual independent high-precision voltage comparator chip of Yijing Microelectronics Co., Ltd. The EG393 is composed of two independent and accurate voltage comparators with an offset voltage of no more than 2.0mV. It can work under a single power supply or a dual power supply. And its current size is not affected by the amplitude of the power supply voltage. These comparators have a unique performance, that is, even when working under a single power supply, their input common mode voltage range can reach zero level;

[0041] The negative temperature coefficient thermistor uses SHM (Southern Hongming)'s DRM200D11 MJDV7GA0, which is a 20Ω power NTC thermistor with the advantages of high sensitivity, good stability, fast response, long life and low price.

[0042] The design working principle is that there are 4 MOS tubes forming a parallel circuit, and a unified operational amplifier voltage comparator is used for voltage control, so that the 4 MOS tubes can work in different areas according to the output requirements. For example, when the output voltage is required to be no more than 25.2V, when the input voltage is greater than 25.2V, the MOS tube is allowed to work in the linear area, and the output voltage is controlled to be no more than 25.2V by using the resistance characteristics of the MOS tube. When the input voltage is less than 25.2V, the MOS tube is allowed to work in the conduction area, at which time the output voltage is equal to the input voltage. When protection occurs, the MOS tube works in the cut-off area, at which time the output power supply is disconnected.

[0043] 2. The sampling feedback part includes:

[0044] Figure 3 The MOS tube voltage sampling feedback circuit shown;

[0045] Figure 4 The MOS tube current sampling feedback circuit shown.

[0046] 3. The protection part includes:

[0047] Overcurrent protection circuit, overvoltage protection circuit, undervoltage protection circuit and overtemperature protection circuit.

[0048] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A high-efficiency direct / direct high-power conversion module, characterized in that: Including power part, sampling feedback part and protection part; The power part includes: a MOS tube, an operational amplifier and a negative temperature coefficient thermistor; The sampling feedback part includes: a MOS tube voltage sampling feedback circuit and a MOS tube current sampling feedback circuit; The protection part includes: an overcurrent protection circuit, an overvoltage protection circuit, an undervoltage protection circuit and an overtemperature protection circuit.

2. The direct / direct high-power high-efficiency conversion module according to claim 1 is characterized in that: Four MOS tubes with similar Q values ​​form a parallel combination, DC 28V is connected to the D poles of the four MOS tubes, the operational amplifier is connected to the G poles of the four MOS tubes, the S poles of the four MOS tubes are connected to a negative temperature coefficient thermistor, and the negative temperature coefficient thermistor is connected to a direct output load.

3. The direct / direct high-power high-efficiency conversion module according to claim 2 is characterized in that: The MOS tube is a MMN360J75U MOS tube with a conduction current of 360A and a withstand voltage of 750V; The operational amplifier uses the EG393 dual independent high-precision voltage comparator chip; The negative temperature coefficient thermistor is a 20Ω power NTC thermistor.

4. The direct / direct high-power high-efficiency conversion module according to claim 1, 2 or 3, characterized in that: The module is integrated on the control board and encapsulated by a shell on the outside.

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