Hydrogen production power supply circuit with soft start function

Abstract

The utility model discloses a hydrogen production power supply circuit with a soft start function. The hydrogen production power supply circuit comprises a first voltage conditioning circuit and a second voltage conditioning circuit which are connected in parallel at an output end, the filter capacitor is connected in parallel between the output end of the first voltage conditioning circuit, the output end of the second voltage conditioning circuit and the positive and negative electrodes of the electrolytic tank; the main control board is used for monitoring the real-time input voltage, the real-time output voltage, the real-time input current and the real-time output current of the hydrogen production power supply circuit; the driving board is used for controlling on or off of all switching tubes in the hydrogen production power supply circuit; wherein the first voltage conditioning circuit and the second voltage conditioning circuit have the same structure; the first voltage conditioning circuit comprises a rectification module, a voltage reduction module and a bus capacitor. The bus capacitor is also connected with the driving board, and the driving board pre-charges the bus capacitor so as to realize the soft start of the circuit; the input end of the second voltage conditioning circuit is connected with a second output winding of the phase-shifting transformer.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production power supplies, and particularly relates to a hydrogen production power supply circuit with a soft start function. Background Art

[0002] The hydrogen production power supply is a key electric energy conversion device in the electrolytic water hydrogen production system. Its core function is to convert alternating current into direct current matching the voltage of the electrolytic cell, so as to drive the electrolysis process of water and decompose water into hydrogen and oxygen. In the renewable energy hydrogen production system, the hydrogen production power supply receives grid power upward and provides stable direct current for the electrolytic cell downward. The performance and stability of the hydrogen production power supply play a crucial role in improving the hydrogen production efficiency and reducing costs.

[0003] At present, the circuit design of the existing hydrogen production power supply in terms of soft start is relatively complex. For example, a grounding resistor and a contactor are arranged on the primary side of the transformer to generate a small amount of alternating current on the primary side and start the hydrogen production circuit on the secondary side to ensure the safe start of components. Therefore, how to improve the soft start circuit of the hydrogen production power supply and reduce the manufacturing cost while ensuring the reliability of the hydrogen production power supply has become an urgent problem to be solved at present. Summary of the Utility Model

[0004] In view of this, the embodiments of the present utility model provide a hydrogen production power supply circuit with a soft start function to solve the problems of relatively complex circuit design and high manufacturing cost of the soft start circuit of the hydrogen production power supply in the prior art.

[0005] The embodiments of the present utility model provide a hydrogen production power supply circuit with a soft start function, including:

[0006] A first voltage conditioning circuit and a second voltage conditioning circuit connected in parallel at the output end;

[0007] A filter capacitor connected in parallel between the output ends of the first voltage conditioning circuit, the output ends of the second voltage conditioning circuit, and the positive and negative electrodes of the electrolytic cell;

[0008] A main control board for monitoring the real-time input voltage, real-time output voltage, real-time input current, and real-time output current of the hydrogen production power supply circuit;

[0009] A drive board for controlling the conduction or cut-off of all switching tubes in the hydrogen production power supply circuit;

[0010] Among them, the first voltage conditioning circuit and the second voltage conditioning circuit have the same structure;

[0011] The first voltage conditioning circuit includes:

[0012] A rectification module, whose input end is connected to the first output winding of the phase-shifting transformer;

[0013] A buck module, whose input end is connected to the output end of the rectification module;

[0014] A bus capacitor, which is connected in parallel between the two output ends of the rectification module; the bus capacitor is also connected to the drive board, and the drive board pre-charges the bus capacitor to achieve soft start of the circuit;

[0015] The input end of the second voltage conditioning circuit is connected to the second output winding of the phase-shifting transformer.

[0016] Optionally, it further includes:

[0017] A third voltage conditioning circuit and a fourth voltage conditioning circuit having the same structure as the first voltage conditioning circuit; wherein, the input ends of the third voltage conditioning circuit and the fourth voltage conditioning circuit are respectively connected to the third output winding and the fourth output winding of the phase-shifting transformer.

[0018] Optionally, the rectification module is a three-phase bridge rectification circuit.

[0019] Optionally, the buck module includes:

[0020] A first IGBT switch tube, whose collector is connected to the positive output end of the rectification module;

[0021] A first freewheeling diode, which is reversely connected in parallel between the collector and the emitter of the first IGBT switch tube;

[0022] A first inductor, one end of which is connected to the emitter of the first IGBT switch tube, and the other end of the first inductor is the positive output end of the hydrogen production power supply circuit;

[0023] A first diode, whose positive electrode is connected to the negative output end of the rectification module, and the negative electrode of the first diode is connected between the emitter of the first IGBT switch tube and one end of the first inductor;

[0024] A second IGBT switch tube, whose collector is connected to the positive output end of the rectification module;

[0025] A second freewheeling diode, which is reversely connected in parallel between the collector and the emitter of the second IGBT switch tube;

[0026] A second inductor, one end of which is connected to the emitter of the second IGBT switch tube, and the other end of the second inductor is the positive output end of the hydrogen production power supply circuit;

[0027] A second diode, whose positive electrode is connected to the negative output end of the rectification module, and the negative electrode of the second diode is connected between the emitter of the second IGBT switch tube and one end of the second inductor;

[0028] Wherein, the negative output end of the rectification module is the negative output end of the hydrogen production power supply circuit.

[0029] Optionally, it further includes:

[0030] A first Hall sensor, disposed between the other end of the first inductor and the filter capacitor;

[0031] A second Hall sensor, disposed between the other end of the second inductor and the filter capacitor.

[0032] Wherein, the first Hall sensor and the second Hall sensor are used to collect the output current of the hydrogen production power supply circuit.

[0033] Optionally, it further includes:

[0034] A first sampling circuit, disposed between the input end of the rectification module and the main control board, for collecting the input current and / or input voltage of the hydrogen production power supply circuit;

[0035] A second sampling circuit, one end of which is connected between the filter capacitor and the positive / negative output end of the hydrogen production power supply circuit, and the other end of which is connected to the main control board, for collecting the output voltage of the hydrogen production power supply circuit.

[0036] Optionally, it further includes:

[0037] Several LED indicators, connected to the main control board, for emitting a light warning when any one of the voltage conditioning circuits collected by the main control board has an abnormality.

[0038] Optionally, the main control board includes:

[0039] A delay start module, for when the three-phase power supply is connected to the hydrogen production power supply circuit, first turning on the drive board to pre-charge the bus capacitor until the bus capacitor reaches the normal working state, and then triggering the drive board to drive and control all the switching tubes in the hydrogen production power supply circuit.

[0040] Advantages of the present utility model:

[0041] The present utility model provides a hydrogen production power supply circuit with a soft start function, including a grid input end, a rectification unit, a buck (BUCK) unit, an output measurement unit and an output end. Among them, the grid input end is a phase-shifting transformer, which branches out two three-phase voltage sources with different phases and is respectively connected to a first voltage conditioning circuit and a second voltage conditioning circuit. A filter capacitor is connected in parallel at the output end and then connected to the electrolytic cell to obtain a low-voltage and high-current hydrogen production power supply module. By setting a pre-charge capacitor and pre-charging the pre-charge capacitor through the drive board, it is avoided that the input current of the rectification unit is too large when the hydrogen production power supply circuit is connected to the three-phase power, reducing the impact and improving the safety of the hydrogen production power supply circuit. Description of the Drawings

[0042] The features and advantages of the present utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as imposing any limitations on the present utility model. In the drawings:

[0043] Figure 1 Shows a circuit diagram of a hydrogen production power supply with a soft start function in an embodiment of the present utility model;

[0044] Figure 2 Shows a circuit diagram of the main control board and the drive board of a hydrogen production power supply circuit with a soft start function in an embodiment of the present utility model. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0046] Embodiment 1

[0047] As Figure 1 and Figure 2 shown, an embodiment of the present utility model provides a hydrogen production power supply circuit with a soft start function, including a first voltage conditioning circuit, a second voltage conditioning circuit, a filter capacitor, a main control board, and a drive board. Among them, the first voltage conditioning circuit and the second voltage conditioning circuit are connected in parallel at the output end. The filter capacitor is connected in parallel between the output end of the first voltage conditioning circuit, the output end of the second voltage conditioning circuit, and the positive and negative electrodes of the electrolytic cell. The main control board is used to monitor the real-time input voltage, real-time output voltage, real-time input current, and real-time output current of the hydrogen production power supply circuit; the drive board is used to control the conduction or cutoff of all the switching tubes in the hydrogen production power supply circuit. The first voltage conditioning circuit and the second voltage conditioning circuit have the same structure.

[0048] The first voltage conditioning circuit includes a rectification module V1, a buck module, and a bus capacitor C1. The input end of the rectification module V1 is connected to the first output winding of the phase-shifting transformer. The input end of the buck module is connected to the output end of the rectification module. The bus capacitor C1 is connected in parallel between the two output ends of the rectification module V1. The bus capacitor C1 is also connected to the drive board, and the drive board pre-charges the bus capacitor C1 to achieve soft start of the circuit.

[0049] The input end of the second voltage conditioning circuit is connected to the second output winding of the phase-shifting transformer.

[0050] The utility model provides a hydrogen production power supply circuit with a soft start function, which includes a grid input end, a rectification unit, a buck (BUCK) unit, an output measurement unit and an output end. Among them, the grid input end is a phase-shifting transformer, which branches out two three-phase voltage sources with different phases and is respectively connected to a first voltage conditioning circuit and a second voltage conditioning circuit. A filter capacitor is connected in parallel at the output end and then connected to an electrolytic cell to obtain a low-voltage and high-current hydrogen production power supply module. By setting a pre-charge capacitor and pre-charging the pre-charge capacitor through a drive board, it is avoided that the input current of the rectification unit is too large when the hydrogen production power supply circuit accesses three-phase electricity, reducing the impact and improving the safety of the hydrogen production power supply circuit.

[0051] In a specific embodiment, a delay start module is set on the main control board to pre-charge the bus capacitor. Specifically, the delay start module is used to, when the hydrogen production power supply circuit accesses three-phase power, first turn on the drive board to pre-charge the bus capacitor until the bus capacitor reaches the normal working state, and then trigger the drive board to drive and control all the switching tubes in the hydrogen production power supply circuit. In a specific implementation manner, the delay time of the delay start module is set according to specific needs.

[0052] As an optional implementation manner, the rectification module is a three-phase bridge rectification circuit.

[0053] As an optional implementation manner, the buck module includes:

[0054] A first IGBT switching tube Q1, whose collector is connected to the positive output end of the rectification module V1;

[0055] A first freewheeling diode D5, which is reversely connected in parallel between the collector and the emitter of the first IGBT switching tube Q1;

[0056] A first inductor L1, one end of which is connected to the emitter of the first IGBT switching tube Q1, and the other end of the first inductor L1 is the positive output end of the hydrogen production power supply circuit;

[0057] A first diode D1, whose positive pole is connected to the negative output end of the rectification module V1, and the negative pole of the first diode is connected between the emitter of the first IGBT switching tube Q1 and one end of the first inductor;

[0058] A second IGBT switching tube Q2, whose collector is connected to the positive output end of the rectification module V1;

[0059] A second freewheeling diode D6, which is reversely connected in parallel between the collector and the emitter of the second IGBT switching tube Q2;

[0060] A second inductor L2, one end of which is connected to the emitter of the second IGBT switching tube Q2, and the other end of the second inductor L2 is the positive output end of the hydrogen production power supply circuit;

[0061] A second diode D2, whose positive electrode is connected to the negative output terminal of the rectification module V1, and the negative electrode of the second diode D2 is connected between the emitter of the second IGBT switch Q2 and one end of the second inductor L2;

[0062] Wherein, the negative output terminal of the rectification module V1 is the negative output terminal of the hydrogen production power supply circuit.

[0063] As an optional implementation manner, it further includes:

[0064] A first Hall sensor H1, disposed between the other end of the first inductor L1 and the filter capacitor C3;

[0065] A second Hall sensor H2, disposed between the other end of the second inductor L2 and the filter capacitor C3.

[0066] The first Hall sensor and the second Hall sensor are used to collect the output current of the hydrogen production power supply circuit.

[0067] As an optional implementation manner, it further includes: a first sampling circuit, disposed between the input end of the rectification module and the main control board, for collecting the input current and / or input voltage of the hydrogen production power supply circuit;

[0068] A second sampling circuit, one end of which is connected between the filter capacitor and the positive / negative output terminal of the hydrogen production power supply circuit, and the other end of which is connected to the main control board, for collecting the output voltage of the hydrogen production power supply circuit.

[0069] As an optional implementation manner, it further includes:

[0070] A plurality of LED indicators, connected to the main control board, for emitting a light warning when any one of the voltage conditioning circuits collected by the main control board has an abnormality.

[0071] In this embodiment, voltage and current monitoring are performed on each voltage conditioning circuit, and an LED indicator is correspondingly set. When the voltage or current value of any one of the voltage conditioning circuits is abnormal, the corresponding LED indicator switches from evergreen to a flashing red light state.

[0072] Embodiment 2

[0073] The difference between this embodiment and Embodiment 1 is that it further includes a third voltage conditioning circuit and a fourth voltage conditioning circuit having the same structure as the first voltage conditioning circuit. The input ends of the third voltage conditioning circuit and the fourth voltage conditioning circuit are respectively connected to the third output winding and the fourth output winding of the phase-shifting transformer.

[0074] The phase-shifting transformer can split out two or four output windings with different phases. According to actual needs, the phase-shifting transformer and several voltage conditioning circuits can be correspondingly selected and extended, so that the hydrogen production power supply module can achieve a greater power output.

[0075] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A hydrogen production power supply circuit with soft start function, characterized in that: include: A first voltage conditioning circuit and a second voltage conditioning circuit connected in parallel at the output end; A filter capacitor connected in parallel between the output end of the first voltage conditioning circuit, the output end of the second voltage conditioning circuit and the positive and negative electrodes of the electrolytic cell; A main control board, used to monitor the real-time input voltage, real-time output voltage, real-time input current and real-time output current of the hydrogen production power supply circuit; A driving board, used to control the on or off of all switch tubes in the hydrogen production power supply circuit; Wherein, the first voltage conditioning circuit and the second voltage conditioning circuit have the same structure; The first voltage conditioning circuit comprises: A rectifier module, an input end of which is connected to the first output winding of the phase-shifting transformer; A step-down module, whose input end is connected to the output end of the rectifier module; A bus capacitor is connected in parallel between the two output ends of the rectifier module; the bus capacitor is also connected to the driving board, and the driving board pre-charges the bus capacitor to achieve soft start of the circuit; The input terminal of the second voltage conditioning circuit is connected to the second output winding of the phase-shifting transformer.

2. The hydrogen production power supply circuit with soft start function according to claim 1, characterized in that: Also includes: A third voltage conditioning circuit and a fourth voltage conditioning circuit having the same structure as the first voltage conditioning circuit; wherein the input end of the third voltage conditioning circuit and the input end of the fourth voltage conditioning circuit are respectively connected to the third output winding and the fourth output winding of the phase-shifting transformer.

3. The hydrogen production power supply circuit with soft start function according to claim 1, characterized in that: The rectifier module is a three-phase bridge rectifier circuit.

4. The hydrogen production power supply circuit with soft start function according to claim 1, characterized in that: The step-down module comprises: A first IGBT switch tube, whose collector is connected to the positive output terminal of the rectifier module; A first freewheeling diode is connected in reverse parallel to the collector and emitter of the first IGBT switch tube; A first inductor, one end of which is connected to the emitter of the first IGBT switch tube, and the other end of the first inductor is the positive output end of the hydrogen production power supply circuit; a first diode, whose anode is connected to the negative output terminal of the rectifier module, and whose cathode is connected between the emitter of the first IGBT switch tube and one end of the first inductor; A second IGBT switch tube, whose collector is connected to the positive output terminal of the rectifier module; A second freewheeling diode is connected in reverse parallel to the collector and emitter of the second IGBT switch tube; A second inductor, one end of which is connected to the emitter of the second IGBT switch tube, and the other end of the second inductor is the positive output end of the hydrogen production power supply circuit; a second diode, whose anode is connected to the negative output terminal of the rectifier module, and whose cathode is connected between the emitter of the second IGBT switch tube and one end of the second inductor; Wherein, the negative output end of the rectifier module is the negative output end of the hydrogen production power supply circuit.

5. The hydrogen production power supply circuit with soft start function according to claim 4, characterized in that: Also includes: A first Hall sensor is arranged between the other end of the first inductor and the filter capacitor; A second Hall sensor is arranged between the other end of the second inductor and the filter capacitor; Wherein, the first Hall sensor and the second Hall sensor are used to collect the output current of the hydrogen production power supply circuit.

6. The hydrogen production power supply circuit with soft start function according to claim 1, characterized in that: Also includes: A first sampling circuit is provided between the input end of the rectifier module and the main control board, and is used to collect the input current and / or input voltage of the hydrogen production power supply circuit; The second sampling circuit has one end connected between the filter capacitor and the positive / negative output end of the hydrogen production power supply circuit and the other end connected to the main control board for collecting the output voltage of the hydrogen production power supply circuit.

7. The hydrogen production power supply circuit with soft start function according to claim 1, characterized in that: Also includes: A plurality of LED indicator lights are connected to the main control board and are used to issue light warnings when an abnormality occurs in any voltage conditioning circuit collected by the main control board.

8. The hydrogen production power supply circuit with soft start function according to claim 1, characterized in that: The main control board comprises: The delayed start module is used to first turn on the driving board to pre-charge the bus capacitor when the hydrogen production power supply circuit is connected to a three-phase power supply until the bus capacitor reaches a normal working state, and then trigger the driving board to drive and control all switch tubes in the hydrogen production power supply circuit.

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