Constant current power supply module

Abstract

The utility model provides a constant current power supply module. The constant current power supply module comprises a circuit board, and a first power supply conversion chip 78M05, a first MOS tube, a second MOS tube and a second power supply conversion chip L6726A which are arranged on the circuit board, one end of the circuit board is provided with a power input interface used for inputting a first direct-current power supply, and the other end of the circuit board is provided with a power output interface used for outputting a second direct-current power supply; the first power supply conversion chip 78M05 converts a first direct-current power supply into a third direct-current power supply, the second power supply conversion chip L6726A converts the third direct-current power supply into a second direct-current power supply, and the magnitude of the output current is dynamically adjusted, so that the output current tends to be stable; the constant-current power supply module can stably provide a power supply with constant current to ensure that the electrolysis device can work normally under various conditions, and the current cannot be increased suddenly even if a short circuit occurs, so that the electrolysis device is protected from being damaged; and the constant-current power supply module also has the characteristics of small size and low manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of power supplies, in particular to a constant current power supply module. Background Art

[0002] A hydrogen water purifier is a device that can produce water rich in hydrogen. It produces hydrogen by electrolyzing water and dissolving the hydrogen in water to produce hydrogen-rich water. An electrolysis module is set inside the hydrogen water purifier to produce hydrogen. Since a constant current needs to be provided during the operation of the electrolysis module, a constant current power supply is required. The constant current power supply in the prior art is expensive and large in size. Utility Model Content

[0003] In order to solve the above technical problems, a technical solution adopted by the utility model is to provide a constant current power supply module, including a circuit board and a first power conversion chip 78M05, a first MOS tube, a second MOS tube and a second power conversion chip L6726A arranged on the circuit board; one end of the circuit board is provided with a power input interface, the power input interface is used to input a first DC power supply, and the other end of the circuit board is provided with a power output interface, the power output interface is used to output a second DC power supply to the outside; the input end of the first power conversion chip 78M05 is electrically connected to the first DC power supply, and the output end outputs a third DC power supply; the second power conversion chip L6726A is electrically connected to the first DC power supply. The source end is electrically connected to the third DC power supply, the first driving end of the second power conversion chip L6726A is electrically connected to the gate of the first MOS tube, the source of the first MOS tube is electrically connected to the first DC power supply, and the drain is electrically connected to the phase monitoring end of the second power conversion chip L6726A, the phase monitoring end of the second power conversion chip L6726A is also electrically connected to the first end of an inductor, and the second end of the inductor outputs the second DC power supply; the drain of the first MOS tube is also electrically connected to the source of the second MOS tube, the gate of the second MOS tube is electrically connected to the second driving end of the second power conversion chip L6726A, and the drain of the second MOS tube is electrically connected to the first DC power supply.

[0004] In the application embodiment, the constant current power supply module also includes an operational amplifier LM321 arranged on the circuit board, the positive phase input terminal of the operational amplifier LM321 is electrically connected to the negative pole of the power output interface, the negative phase input terminal and the power supply terminal of the operational amplifier LM321 are both electrically connected to the third DC power supply, and the output terminal of the operational amplifier LM321 is electrically connected to the feedback terminal of the second power conversion chip L6726A.

[0005] In the application embodiment, the drain of the first MOS tube is also electrically connected to the cathode of the first protection diode, the anode of the first protection diode is grounded, the cathode of the first protection diode is electrically connected to one end of the first protection resistor, and the other end of the first protection resistor is electrically connected to the first capacitor and then grounded.

[0006] In the application embodiment, the output end of the operational amplifier LM321 is electrically connected to the first feedback resistor and then connected to the feedback end of the second power conversion chip L6726A. The feedback end of the second power conversion chip L6726A is also electrically connected to the second feedback resistor and then grounded. The feedback end of the second power conversion chip L6726A is also connected in series with the third feedback resistor and then connected to the second end of the inductor. The feedback end of the second power conversion chip L6726A is also connected in series with the fourth feedback resistor and the second capacitor in sequence and then connected to the second end of the inductor.

[0007] In the application embodiment, the negative phase input terminal of the operational amplifier LM321 is electrically connected to the first voltage-dividing resistor and then grounded, and is also electrically connected to the second voltage-dividing resistor and then connected to the third DC power supply.

[0008] In the application embodiment, the negative phase input terminal of the operational amplifier LM321 is also connected in series with a second protection resistor and a third capacitor and then connected to the output terminal of the operational amplifier LM321.

[0009] In the application embodiment, the non-inverting input terminal of the operational amplifier LM321 is electrically connected to the first detection resistor and then connected to the negative electrode of the power output interface, and the negative electrode of the power output interface is also electrically connected to the second detection resistor and then grounded.

[0010] In the application embodiment, the third driving end of the second power conversion chip L6726A is electrically connected to the fourth capacitor and then connected to the drain of the first MOS tube. The third driving end of the second power conversion chip L6726A is also electrically connected to the third protection resistor and then connected to the cathode of the second protection diode. The anode of the second protection diode is electrically connected to the third DC power supply.

[0011] In the application embodiment, the input end of the first power conversion chip 78M05 is also electrically connected to the cathode of the third protection diode, and the anode of the third protection diode is electrically connected to the ground end of the first power conversion chip 78M05.

[0012] In the application embodiment, the circuit board is rectangular in shape as a whole, and fixing holes are provided at four end corners of the circuit board along the circumference of the circuit board.

[0013] The beneficial effects of the utility model are as follows: the utility model provides a constant current power supply module, including a circuit board and a first power conversion chip 78M05, a first MOS tube, a second MOS tube and a second power conversion chip L6726A arranged on the circuit board; a power input interface is arranged at one end of the circuit board, and the power input interface is used to input a first DC power supply, and a power output interface is arranged at the other end of the circuit board, and the power output interface is used to output a second DC power supply to the outside; the first power conversion chip 78M05 converts the first DC power supply into a third DC power supply, and the second power conversion chip L6726A converts the third DC power supply into a second DC power supply, and dynamically adjusts the output current thereof to make it stable; the constant current power supply module can stably provide a power supply with a constant current, ensuring that the electrolysis device can work normally under various conditions, and even if a short circuit occurs, it will not cause a sudden increase in current, thereby protecting the electrolysis device from damage; the constant current power supply module also has the characteristics of small size and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a circuit board of a constant current power supply module of the utility model;

[0015] Figure 2 It is a schematic diagram of the first power conversion chip 78M05 in a constant current power module of the utility model;

[0016] Figure 3 It is a schematic diagram of the second power conversion chip L6726A in a constant current power module of the utility model;

[0017] Figure 4 This is a connection diagram of a first MOS tube and a second MOS tube in a constant current power module of the utility model;

[0018] Figure 5 It is a schematic diagram of an operational amplifier LM321 in a constant current power supply module in the utility model. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0021] The utility model provides a constant current power supply module, which can be used in a hydrogen water purifier to stably provide a constant current output to an electrolysis device in the hydrogen water purifier, ensuring that the electrolysis device can work normally under various conditions, and even if a short circuit occurs, it will not cause a sudden increase in current, thereby protecting the electrolysis device from damage. The constant current power supply module in the utility model also has the characteristics of small size and low cost.

[0022] Specifically, Figures 1 to 5 As shown in FIG. 1 , as a specific embodiment of the constant current power supply module, the constant current power supply module includes a circuit board 101 and a first power conversion chip 78M05 ( Figure 1 U3), the first MOS tube Q1, the second MOS tube Q2 and the second power conversion chip L6726A ( Figure 1 U1); A power input interface J3 is provided at one end of the circuit board 101, and the power input interface J3 is used to input a first DC power supply +24V. After the first DC power supply +24V is converted by the first power conversion chip 78M05 and the second power conversion chip L6726A, the second DC power supply +2.7V is output to the outside through the power output interface (composed of the positive electrode J1 and the negative electrode J2) at the other end of the circuit board 101, that is, power is supplied to the electrolysis device in the water purifier. The voltage of the second DC power supply is +2.7V, and the current of the second DC power supply is 7A.

[0023] In this embodiment, if Figure 1 As shown, the circuit board 101 is rectangular in shape as a whole, with a length of 100 mm and a width of 40 mm. Fixing holes 102 are provided at the four end corners of the circuit board 101 along the circumference of the circuit board 101 to facilitate fixation.

[0024] In this embodiment, if Figure 2 As shown, the input terminal Vin of the first power conversion chip 78M05 is electrically connected to the first DC power supply +24V, the output terminal Vout outputs the third DC power supply +5V, and the ground terminal GND of the first power conversion chip 78M05 is grounded.

[0025] The input terminal Vin of the first power conversion chip 78M05 is also electrically connected to the cathode of the third protection diode D3, and the anode of the third protection diode D3 is electrically connected to the ground terminal GND of the first power conversion chip 78M05. The third protection diode D3 protects the first power conversion chip 78M05 to prevent the positive and negative poles of the first DC power supply +24V from being reversed.

[0026] The input terminal Vin of the first power conversion chip 78M05 is also connected in series with capacitors C15 and C16 and then grounded. Capacitors C15 and C16 filter the input first DC power supply +24V. The output terminal Vout of the first power conversion chip 78M05 is also connected in series with capacitors C17 and C18 and then grounded. Capacitors C17 and C18 filter the output third DC power supply +5V.

[0027] like Figure 3 and Figure 4 As shown, in this embodiment, Figure 3 The power supply terminal VCC of the second power conversion chip L6726A is electrically connected to the third DC power supply +5V, and the first drive terminal LGATE of the second power conversion chip L6726A is electrically connected to Figure 4 The gate of the first MOS tube Q1, the source of the first MOS tube Q1 is electrically connected to the first DC power supply +24V, the drain is electrically connected to the phase monitoring terminal PHASE of the second power conversion chip L6726A, the phase monitoring terminal PHASE of the second power conversion chip L6726A is also electrically connected to the first end of an inductor L1, the second end of the inductor L1 outputs the second DC power supply +2.7V, the drain of the first MOS tube Q1 is also electrically connected to the source of the second MOS tube Q2, the gate of the second MOS tube Q2 is electrically connected to the second driving terminal UGATE of the second power conversion chip L6726A, and the drain of the second MOS tube Q2 is electrically connected to the first DC power supply +24V. In this embodiment, the second power conversion chip L6726A can convert the third DC power supply +5V into the second DC power supply +2.7V for external output.

[0028] like Figure 4 and Figure 5 As shown, in this embodiment, the drain of the first MOS tube Q1 is also electrically connected to the cathode of the first protection diode D2, the anode of the first protection diode D2 is grounded, the cathode of the first protection diode D2 is electrically connected to one end of the first protection resistor R13, and the other end of the first protection resistor R13 is electrically connected to the first capacitor C12 and then grounded.

[0029] In this embodiment, Figure 3The third driving end BOOT of the second power conversion chip L6726A is electrically connected to the fourth capacitor C1 and then connected to the drain of the first MOS tube Q1. The third driving end BOOT of the second power conversion chip L6726A is also electrically connected to the third protection resistor R1 and then connected to the cathode of the second protection diode D1. The anode of the second protection diode D1 is electrically connected to the third DC power supply +5V.

[0030] Further, such as Figure 1 and Figure 5 As shown, in this embodiment, the constant current power supply module further includes an operational amplifier LM321 ( Figure 1 U2), the positive input terminal +IN of the operational amplifier LM321 is electrically connected to the negative electrode (J2) of the power output interface, the negative input terminal -IN and the power terminal V+ of the operational amplifier LM321 are both electrically connected to the third DC power supply +5V, and the output terminal OUT of the operational amplifier LM321 is electrically connected to the first feedback resistor R9 and then connected to the feedback terminal FB of the second power conversion chip L6726A; in this embodiment, the operational amplifier LM321 detects the current output by the second DC power supply +2.7V through the negative input terminal -IN, and transmits the detection signal to the feedback terminal FB of the second power conversion chip L6726A, and the second power conversion chip L6726A adjusts the current of the second DC power supply +2.7V output by turning on or off the first MOS tube Q1 and the second MOS tube Q2, so that the current of the second DC power supply +2.7V tends to be stable.

[0031] In this embodiment, the feedback end of the second power conversion chip L6726A is also electrically connected to the second feedback resistor R5 and then grounded. The feedback end FB of the second power conversion chip L6726A is also connected in series with the third feedback resistor R7 and then connected to the second end of the inductor L1. The feedback end of the second power conversion chip L6726A is also connected in series with the fourth feedback resistor R8 and the second capacitor C6 in sequence and then connected to the second end of the inductor L1. The second end of the inductor L1 is also connected in series with capacitors C7, C8, C9 and C10 respectively and then grounded. These capacitors are used to filter the second DC power supply output by the inductor L1.

[0032] In this embodiment, the negative phase input terminal -IN of the operational amplifier LM321 is electrically connected to the first voltage-dividing resistor R10 and then grounded, and is also electrically connected to the second voltage-dividing resistor R11 and then connected to the third DC power supply +5V. The negative phase input terminal -IN of the operational amplifier LM321 is also connected in series with the second protection resistor R12 and the third capacitor C11 and then connected to the output terminal OUT of the operational amplifier LM321.

[0033] In this embodiment, the positive phase input terminal +IN of the operational amplifier LM321 is electrically connected to the first detection resistor R6 and then connected to the negative electrode (J2) of the power output interface, and the negative electrode (J2) of the power output interface is also electrically connected to the second detection resistor R4 and then grounded. During the operation of the constant current power supply module, the current is fed back to the feedback terminal of the second power conversion chip L6726A through the operational amplifier LM321, and the second power conversion chip L6726A dynamically adjusts the output current to make it stable.

[0034] It can be seen that the utility model provides a constant current power supply module, including a circuit board and a first power conversion chip 78M05, a first MOS tube, a second MOS tube and a second power conversion chip L6726A arranged on the circuit board; a power input interface is provided at one end of the circuit board, and the power input interface is used to input a first DC power supply, and a power output interface is provided at the other end of the circuit board, and the power output interface is used to output a second DC power supply to the outside; the first power conversion chip 78M05 converts the first DC power supply into a third DC power supply, and the second power conversion chip L6726A converts the third DC power supply into a second DC power supply, and dynamically adjusts the output current thereof to make it stable; the constant current power supply module can stably provide a power supply with a constant current, ensuring that the electrolysis device can work normally under various conditions, and even if a short circuit occurs, it will not cause a sudden increase in current, thereby protecting the electrolysis device from damage; the constant current power supply module also has the characteristics of small size and low cost.

[0035] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A constant current power supply module, characterized in that: It includes a circuit board and a first power conversion chip 78M05, a first MOS tube, a second MOS tube and a second power conversion chip L6726A arranged on the circuit board; A power input interface is provided at one end of the circuit board, and the power input interface is used to input a first DC power supply. A power output interface is provided at the other end of the circuit board, and the power output interface is used to output a second DC power supply. The input end of the first power conversion chip 78M05 is electrically connected to the first DC power supply, and the output end outputs the third DC power supply; The power supply end of the second power conversion chip L6726A is electrically connected to the third DC power supply, the first driving end of the second power conversion chip L6726A is electrically connected to the gate of the first MOS tube, the source of the first MOS tube is electrically connected to the first DC power supply, and the drain is electrically connected to the phase monitoring end of the second power conversion chip L6726A, the phase monitoring end of the second power conversion chip L6726A is also electrically connected to the first end of an inductor, and the second end of the inductor outputs the second DC power supply; The drain of the first MOS tube is also electrically connected to the source of the second MOS tube, the gate of the second MOS tube is electrically connected to the second driving end of the second power conversion chip L6726A, and the drain of the second MOS tube is electrically connected to the first DC power supply.

2. The constant current power supply module according to claim 1, characterized in that: The constant current power supply module also includes an operational amplifier LM321 arranged on the circuit board, the positive phase input terminal of the operational amplifier LM321 is electrically connected to the negative pole of the power output interface, the negative phase input terminal and the power supply terminal of the operational amplifier LM321 are both electrically connected to the third DC power supply, and the output terminal of the operational amplifier LM321 is electrically connected to the feedback terminal of the second power conversion chip L6726A.

3. The constant current power supply module according to claim 1, characterized in that: The drain of the first MOS tube is also electrically connected to the cathode of the first protection diode, the anode of the first protection diode is grounded, the cathode of the first protection diode is electrically connected to one end of the first protection resistor, and the other end of the first protection resistor is electrically connected to the first capacitor and then grounded.

4. The constant current power supply module according to claim 2, characterized in that: The output end of the operational amplifier LM321 is electrically connected to the first feedback resistor and then connected to the feedback end of the second power conversion chip L6726A. The feedback end of the second power conversion chip L6726A is also electrically connected to the second feedback resistor and then grounded. The feedback end of the second power conversion chip L6726A is also connected in series with the third feedback resistor and then connected to the second end of the inductor. The feedback end of the second power conversion chip L6726A is also connected in series with the fourth feedback resistor and the second capacitor in sequence and then connected to the second end of the inductor.

5. The constant current power supply module according to claim 4, characterized in that: The negative phase input terminal of the operational amplifier LM321 is electrically connected to the first voltage-dividing resistor and then grounded, and is also electrically connected to the second voltage-dividing resistor and then connected to the third DC power supply.

6. The constant current power supply module according to claim 5, characterized in that: The negative phase input terminal of the operational amplifier LM321 is also connected in series with a second protection resistor and a third capacitor and then connected to the output terminal of the operational amplifier LM321.

7. The constant current power supply module according to claim 6, characterized in that: The non-phase input terminal of the operational amplifier LM321 is electrically connected to the first detection resistor and then connected to the negative electrode of the power output interface. The negative electrode of the power output interface is also electrically connected to the second detection resistor and then grounded.

8. The constant current power supply module according to claim 1, characterized in that: The third driving end of the second power conversion chip L6726A is electrically connected to the fourth capacitor and then connected to the drain of the first MOS tube. The third driving end of the second power conversion chip L6726A is also electrically connected to the third protection resistor and then connected to the cathode of the second protection diode. The anode of the second protection diode is electrically connected to the third DC power supply.

9. The constant current power supply module according to claim 1, characterized in that: The input end of the first power conversion chip 78M05 is also electrically connected to the cathode of the third protection diode, and the anode of the third protection diode is electrically connected to the ground end of the first power conversion chip 78M05.

10. The constant current power supply module according to any one of claims 1 to 9, characterized in that: The circuit board is rectangular in shape as a whole, and fixing holes are arranged at four end corners of the circuit board along the circumference of the circuit board.

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