Switch isolating circuit for direct-current power supply control circuit

Abstract

A switch isolation circuit for a direct-current power supply control circuit relates to the technical field of direct-current power supplies and comprises a photoelectric isolation unit, an anode switch unit and a cathode switch unit. Wherein the input end of the optoelectronic isolation unit is electrically connected with the controller, the output end of the optoelectronic isolation unit is electrically connected with the anode switch unit and the cathode switch unit, the anode switch unit is electrically connected with the anode of the load, and the cathode switch unit is electrically connected with the cathode of the load; and load power supply can be stably switched.

Description

TECHNICAL FIELD

[0001] The utility model relates to direct current power supply technical field, concretely relates to a switch isolation circuit for direct current power supply control circuit. BACKGROUND

[0002] It is known that direct current power supply is a power supply device capable of providing stable constant current for multiple loads at the same time, but for the automatic production line, the number of loads used is larger, and the power supply between multiple loads needs to be frequently switched, the traditional method is to set a relay on each load, and then control the opening and closing of the relay through the processor to supply power to the corresponding load, but due to the complex power supply situation between multiple loads, the power supply needs to be frequently switched, so the switch contacts of the relay need to be frequently switched, which is easy to cause the contact adhesion, affecting the power supply state of multiple loads, and further affecting the actual production work.

[0003] Therefore, we propose a switch circuit capable of stably switching load power supply CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a switch isolation circuit for direct current power supply control circuit can stably switch load power supply.

[0005] The utility model discloses the following technical scheme realizes:

[0006] A switch isolation circuit for direct current power supply control circuit, characterized by: including photoelectric isolation unit, positive electrode switch unit and negative electrode switch unit.

[0007] The input end of the photoelectric isolation unit is electrically connected with the controller, the output end of the photoelectric isolation unit is electrically connected with the positive electrode switch unit and the negative electrode switch unit respectively, the positive electrode switch unit is electrically connected with the positive electrode of the load, and the negative electrode switch unit is electrically connected with the negative electrode of the load.

[0008] Further, the photoelectric isolation unit includes an optoelectronic coupler, a first filter capacitor and a first voltage dividing resistor, the input end of the optoelectronic coupler is electrically connected with the controller, the first filter capacitor is connected in parallel with the optoelectronic coupler, and the output end of the optoelectronic coupler is connected in series with the first voltage dividing resistor and then electrically connected with the positive electrode switch unit and the negative electrode switch unit respectively.

[0009] Further, the positive electrode switch unit includes MOS tube Q8, MOS tube T3 and MOS tube T4, the output end of the MOS tube Q8 is electrically connected with the positive electrode of the load, the input end of the MOS tube Q8 is electrically connected with the MOS tube T3 and the MOS tube T4 respectively, and the input end of the MOS tube T3 and the MOS tube T4 is electrically connected with the photoelectric isolation unit.

[0010] Further, the negative electrode switch unit comprises a MOS tube Q16, a MOS tube T15 and a MOS tube T16, wherein the output end of the MOS tube Q16 is electrically connected with the negative electrode of the load, the input end of the MOS tube Q16 is electrically connected with the MOS tube T15 and the MOS tube T16 respectively, and the input end of the MOS tube T15 and the MOS tube T16 is electrically connected with the photoelectric isolation unit.

[0011] Further, the MOS tube Q8 is a P-channel MOS tube, and the MOS tube T3 and the MOS tube T4 are N-channel MOS tubes.

[0012] Further, the MOS tube Q16 is a P-channel MOS tube, and the MOS tube T15 and the MOS tube T16 are N-channel MOS tubes.

[0013] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0014] The utility model discloses a switch isolation circuit for direct current power control circuit, through adopting photoelectric isolation mode, can carry out effective isolation to the output signal of positive electrode control unit and negative electrode control unit to guarantee the accuracy of signal transmission, improve the reliability of this circuit,

[0015] In addition, the MOS tubes in the positive electrode switch unit and the negative electrode switch unit adopt a parallel redundant design mode, can shunt the signal, thereby improving the reliability of the module circuit and reducing the heat generation. DRAWINGS

[0016] Figure 1 It is a circuit structure schematic view of the utility model.

[0017] Mark: 1, photoelectric isolation unit;11, photoelectric coupler;12, first filter capacitor;13, first voltage dividing resistor;2, positive electrode switch unit;21, MOS tube Q8;22, MOS tube T3;23, MOS tube T4;3, negative electrode switch unit;31, MOS tube Q16;32, MOS tube T15;33, MOS tube T16. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. The components of the utility model embodiment described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the application.

[0020] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, only for the convenience of describing the application and simplifying the description, and it does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the application.

[0022] In the description of the application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or they can be detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. Embodiment 1

[0023] As shown in the accompanying drawings Figure 1 A switch isolation circuit for a direct current power supply control circuit, characterized in that: comprising an optoelectronic isolation unit 1, a positive electrode switch unit 2 and a negative electrode switch unit 3;

[0024] The input end of the optoelectronic isolation unit 1 is electrically connected with the controller, the output end of the optoelectronic isolation unit 1 is respectively electrically connected with the positive electrode switch unit 2 and the negative electrode switch unit 3, and the positive electrode switch unit 2 is electrically connected with the positive electrode of the load, and the negative electrode switch unit 3 is electrically connected with the negative electrode of the load;

[0025] The positive electrode switch unit 2 and the negative electrode switch unit 3 receive signals from the positive electrode or the negative electrode of the load, perform corresponding processing, and output to the controller, which processes the signals and performs subsequent control operations; and the optoelectronic isolation unit 1 can effectively isolate the output signals of the positive electrode control unit and the negative electrode control unit, thereby ensuring the accuracy of signal transmission and improving the reliability of the circuit.

[0026] In addition, the optoelectronic isolation unit 1 includes an optoelectronic coupler 11, a first filter capacitor 12, and a first voltage dividing resistor 13, wherein the input end of the optoelectronic coupler 11 is electrically connected to the controller, the first filter capacitor 12 is connected in parallel to the outside of the optoelectronic coupler 11, and the output end of the optoelectronic coupler 11 is connected in series with the first voltage dividing resistor 13, and then the first voltage dividing resistor 13 is electrically connected to the positive electrode switch unit 2 and the negative electrode switch unit 3, respectively.

[0027] The filter capacitor 12 can filter the electrical signals input by the controller to the optoelectronic isolation unit 1, thereby ensuring the quality and stability of the electrical signals, and in addition, the first voltage dividing resistor 13 also serves to keep the signals stable.

[0028] According to the needs, the positive electrode switch unit 2 includes MOS tubes Q821, MOS tubes T322, and MOS tubes T423, wherein the output end of the MOS tube Q821 is electrically connected to the positive electrode of the load, the input end of the MOS tube Q821 is electrically connected to the MOS tube T322 and the MOS tube T423, respectively, and the input end of the MOS tube T322 and the MOS tube T423 is electrically connected to the optoelectronic isolation unit 1.

[0029] In addition, the negative electrode switch unit 3 includes MOS tubes Q1631, MOS tubes T1532, and MOS tubes T1633, wherein the output end of the MOS tube Q1631 is electrically connected to the negative electrode of the load, the input end of the MOS tube Q1631 is electrically connected to the MOS tube T1532 and the MOS tube T1633, respectively, and the input end of the MOS tube T1532 and the MOS tube T1633 is electrically connected to the optoelectronic isolation unit 1.

[0030] It should be noted that in the positive electrode switch unit 2 and the negative electrode switch unit 3, two groups of parallel MOS tubes are used in the redundant design, i.e. the MOS tube T322 and the MOS tube T423 in the positive electrode switch unit 2, and the MOS tube T1532 and the MOS tube T1633 in the negative electrode switch unit 3, which can shunt the current, thereby improving the reliability of the module circuit and reducing the heat generation,

[0031] In addition, the MOS tube Q821 of the positive electrode switch unit 2 and the MOS tube Q1631 of the negative electrode switch unit 3 can also be provided with a second filter capacitor and a second voltage dividing resistor similar to those in the optoelectronic isolation unit 1, for improving the stability and quality of the control signals output by the corresponding switch unit 2.

[0032] Particularly, the MOS tube Q821 is a P-channel MOS tube, and the MOS tube T322 and the MOS tube T423 are N-channel MOS tubes.

[0033] Particularly, the MOS tube Q1631 is a P-channel MOS tube, and the MOS tube T1532 and the MOS tube T1633 are N-channel MOS tubes.

[0034] It should be noted that in the specific implementation, multiple switch isolation circuits are arranged in the direct current power supply, and the multiple switch isolation circuits and the multiple loads are in one-to-one correspondence.

[0035] The preferred embodiments of the utility model are merely used for limiting the utility model, and for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A switch isolation circuit for a direct current power supply control circuit, characterized by: The application relates to a photovoltaic isolation unit (1), a positive electrode switch unit (2) and a negative electrode switch unit (3). The input end of the photovoltaic isolation unit (1) is electrically connected with a controller, the output end of the photovoltaic isolation unit (1) is electrically connected with the positive electrode switch unit (2) and the negative electrode switch unit (3) respectively, the positive electrode switch unit (2) is electrically connected with the positive electrode of a load, and the negative electrode switch unit (3) is electrically connected with the negative electrode of the load.

2. The switch isolation circuit for a DC power control circuit according to claim 1, characterized by: The photovoltaic isolation unit (1) comprises a photoelectric coupler (11), a first filter capacitor (12) and a first voltage dividing resistor (13), the input end of the photoelectric coupler (11) is electrically connected with the controller, the photoelectric coupler (11) is connected in parallel with the first filter capacitor (12) outside, the output end of the photoelectric coupler (11) is connected in series with the first voltage dividing resistor (13) and then is electrically connected with the positive electrode switch unit (2) and the negative electrode switch unit (3) respectively.

3. The switch isolation circuit for a DC power control circuit according to claim 1, characterized by: The positive electrode switch unit (2) comprises MOS tubes Q8 (21), T3 (22) and T4 (23), the output end of the MOS tube Q8 (21) is electrically connected with the positive electrode of the load, the input end of the MOS tube Q8 (21) is electrically connected with the MOS tubes T3 (22) and T4 (23) respectively, and the input ends of the MOS tubes T3 (22) and T4 (23) are electrically connected with the photovoltaic isolation unit (1).

4. The switch isolation circuit for a DC power control circuit according to claim 1, characterized by: The negative electrode switch unit (3) comprises MOS tubes Q16 (31), T15 (32) and T16 (33), the output end of the MOS tube Q16 (31) is electrically connected with the negative electrode of the load, the input end of the MOS tube Q16 (31) is electrically connected with the MOS tubes T15 (32) and T16 (33) respectively, and the input ends of the MOS tubes T15 (32) and T16 (33) are electrically connected with the photovoltaic isolation unit (1).

5. The switch isolation circuit for a DC power control circuit according to claim 3, characterized by: The MOS tube Q8 (21) is a P-channel MOS tube, the MOS tubes T3 (22) and T4 (23) are N-channel MOS tubes.

6. The switch isolation circuit for a DC power control circuit according to claim 4, characterized by: The MOS tube Q16 (31) is a P-channel MOS tube, the MOS tubes T15 (32) and T16 (33) are N-channel MOS tubes.

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