CN216819428U - Cascaded high-voltage charger module - Google Patents

Abstract

The utility model relates to the technical field of chargers, in particular to a cascade high-voltage charger module. The cascade high-voltage charger module comprises a control unit, an LLC cascade unit and a sampling unit; the input end of the sampling unit is connected with the LLC cascade unit, and the output end of the sampling unit is connected with the control unit; and the output end of the control unit is connected with the LLC cascade unit. By adopting the multi-stage LLC cascade circuit to share the total power, the multi-stage modular design is easy to maintain later, and the current and voltage stress of the power device is further reduced. In addition, one or more stages of LLC cascaded circuits can be selected for use according to different power requirements.

Description

Cascaded high-voltage charger module

Technical Field

The utility model relates to the technical field of chargers, in particular to a cascade high-voltage charger module.

Background

The charger adopts a high-frequency power supply technology and an advanced intelligent dynamic adjustment charging technology. The charger takes a microprocessor (CPU chip) as a processing control center, burns a complicated hardware analog circuit into the microprocessor and controls the operation of the UPS in a software program mode. Therefore, the volume is greatly reduced, the weight is greatly reduced, the manufacturing cost is low, and the selling price is relatively low. The inversion frequency of the high-frequency machine is generally above 20 KHZ. However, the high-frequency machine has poor tolerance capability under severe power grid and environmental conditions, and is more suitable for environments with stable power grid, less dust and proper temperature/humidity.

The traditional high-voltage machine has large power, high output voltage, higher total running power of internal modules, large stress of power devices on current and voltage and relatively higher maintenance cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cascade high-voltage charger module aiming at the technical problems in the prior art, and aims to solve the problems of high power, high current and high voltage stress of the traditional high-voltage charger.

The technical scheme for solving the technical problems is as follows: a cascade high-voltage charger module comprises a control unit, an LLC cascade unit and a sampling unit; the input end of the sampling unit is connected with the LLC cascade unit, and the output end of the sampling unit is connected with the control unit; the output end of the control unit is connected with the LLC cascade unit,

the LLC cascade unit comprises a multi-stage LLC cascade circuit;

the sampling unit is used for acquiring power supply information of the LLC cascade unit;

and the control unit controls voltage sharing among the multi-stage LLC cascaded circuits to charge at constant current according to the power supply information.

On the basis of the technical scheme, the utility model can be further improved as follows.

Further, the LLC cascade circuit is composed of an input capacitor CIN, a field effect transistor MOSU, a field effect transistor MOSB, a resonant capacitor CR1, a resonant capacitor CR2, a resonant inductor LR, a resonant transformer T, an output rectifier diode DL1, an output rectifier diode DL2, an output rectifier diode DR1, an output rectifier diode DR2, and an output filter capacitor CO.

Furthermore, input capacitors CI N of the multistage LLC cascade circuit are connected in parallel in sequence; and output filter capacitors CO of the multi-stage LLC cascade circuit are sequentially connected in series.

Further, when the resonant current in the LLC cascade circuit is in the positive half cycle, the resonant transformer T charges the output filter capacitor CO through the output rectifier diode DL1 and the output rectifier diode DR 2.

Further, the power supply information includes input and output voltages, input and output currents, and a device temperature signal.

The utility model has the beneficial effects that: the cascaded high-voltage charger module provided by the utility model has the advantages that the total power is shared by adopting the multistage LLC cascaded circuits, the multistage modular design is easy to maintain later, and the current and voltage stress of a power device is further reduced. In addition, one or more stages of LLC cascaded circuits can be selected for use according to different power requirements.

Drawings

FIG. 1 is a schematic block diagram of the system of the present invention;

FIG. 2 is a circuit diagram of an LLC cascaded circuit of the utility model;

fig. 3 is a circuit diagram of the multi-stage LLC cascade circuit of the present invention.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.

It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are intended to be construed broadly, as if they were connected either fixedly or removably, or as integrally formed structures. To those of ordinary skill in the art, the specific meaning of such terms in this patent may be understood as appropriate.

As shown in fig. 1, the cascade high-voltage charger module of the present invention includes a control unit, an LLC cascade unit and a sampling unit; the input end of the sampling unit is connected with the LLC cascade unit, and the output end of the sampling unit is connected with the control unit; the output end of the control unit is connected with the LLC cascade unit,

the LLC cascade unit comprises a multi-stage LLC cascade circuit;

the sampling unit is used for acquiring power supply information of the LLC cascade unit;

and the control unit controls voltage sharing among the multi-stage LLC cascaded circuits to charge at constant current according to the power supply information.

According to the cascade high-voltage charger module designed by the utility model, the total power is shared by adopting the multi-stage LLC cascade circuits, the multi-stage modularized design is easy for later maintenance, and the current and voltage stress of a power device is further reduced. In addition, one or more stages of LLC cascaded circuits can be selected for use according to different power requirements.

The examples of the utility model are as follows:

in this embodiment, the cascade high-voltage charger module mainly includes three units, namely a control unit, an LLC cascade unit, and a sampling unit, and can provide wide-range input and wide-range output, thereby effectively realizing stable dc power supply.

The input end of the sampling unit is connected with the LLC cascade unit, and the output end of the sampling unit is connected with the control unit; and the output end of the control unit is connected with the LLC cascade unit.

As shown in fig. 2, the LLC cascade unit includes a multi-stage LLC cascade circuit, and the LLC cascade circuit is composed of an input capacitor CIN, a field effect transistor MOSU, a field effect transistor MOSB, a resonant capacitor CR1, a resonant capacitor CR2, a resonant inductor LR, a resonant transformer T, an output rectifier diode DL1, an output rectifier diode DL2, an output rectifier diode DR1, an output rectifier diode DR2, and an output filter capacitor CO.

It should be noted that the control unit may specifically include a logic control chip and a driver chip, and is used for independently controlling the multi-stage LLC cascade circuit. The model of the control unit can be HCKZ-DC600-DC350, and the model of the sampling unit can be HCCJ-DC600-DC 3500.

As shown in fig. 2 and 3, the LLC cascade circuits in this embodiment have three stages, and the input capacitances CIN of the LLC cascade circuits at each stage are connected in parallel in sequence; output filter capacitors CO of all stages of LLC cascade circuits are sequentially connected in series, and constant current is realized through the three stages of LLC cascade circuits to charge the high-voltage capacitor.

The LLC cascade unit is powered by direct current DC500V-700V, and in the process of direct current power supply, the power supply information of the LLC cascade unit is acquired by the acquisition unit; the power supply information comprises input and output voltage, input and output current and a device temperature signal. The control unit sends a control signal according to the acquired power supply information, drives each level of LLC cascade circuit in the LLC cascade unit to work, and realizes that each level of LLC cascade circuit simultaneously has constant current to charge the high-voltage capacitor from the current value to 3500V.

Specifically, in this embodiment, the control unit controls the three-level LLC cascade connection circuit to work synchronously, a high-frequency soft start mode is adopted, the power supply information returned by the sampling unit is used, and the frequencies of the other two-level LLC cascade connection circuit are fine-tuned to realize that the output voltages are basically the same during the charging process, and after the charging reaches a set value, the control unit prohibits the LLC cascade connection unit from working.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (5)

1. A cascade type high-voltage charger module is characterized by comprising a control unit, an LLC cascade unit and a sampling unit; the input end of the sampling unit is connected with the LLC cascade unit, and the output end of the sampling unit is connected with the control unit; the output end of the control unit is connected with the LLC cascade unit,

the LLC cascade unit comprises a multi-stage LLC cascade circuit;

the sampling unit is used for acquiring power supply information of the LLC cascade unit;

and the control unit controls voltage sharing among the multi-stage LLC cascaded circuits to charge at constant current according to the power supply information.

2. The cascaded high-voltage charger module according to claim 1, wherein the LLC cascaded circuit is composed of an input capacitor CIN, a field-effect transistor MOSU, a field-effect transistor MOSB, a resonant capacitor CR1, a resonant capacitor CR2, a resonant inductor LR, a resonant transformer T, an output rectifier diode DL1, an output rectifier diode DL2, an output rectifier diode DR1, an output rectifier diode DR2, and an output filter capacitor CO.

3. The cascaded high-voltage charger module according to claim 2, wherein input capacitors CIN of the LLC cascaded circuits are sequentially connected in parallel; and output filter capacitors CO of the multistage LLC cascade circuit are sequentially connected in series.

4. The cascade-type high-voltage charger module according to claim 2, wherein when the resonant current in the LLC cascade circuit is in the positive half cycle, the resonant transformer T charges the output filter capacitor CO through the output rectifier diode DL1 and the output rectifier diode DR 2.

5. The cascaded high-voltage charger module according to claim 1, wherein the power information comprises input and output voltage, input and output current, and device temperature signals.

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