Isolation module control circuit

Abstract

The utility model provides an isolation module control circuit, which comprises a first step-down circuit unit, a second step-down circuit unit, a main control chip U1, an isolation module and an optocoupler module, the first step-down circuit unit is electrically connected with the second step-down circuit unit, the second step-down circuit unit is electrically connected with the main control chip, the isolation module is electrically connected with the first step-down circuit unit, and the optocoupler module is electrically connected with the isolation module, the second step-down circuit unit and the main control chip U1; according to the utility model, electrical isolation can be effectively realized, the anti-interference capability of the whole circuit is ensured, the circuit is well protected, and the maintenance cost of the product is reduced at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of isolation circuits, and particularly relates to an isolation module control circuit. Background Art

[0002] In the existing circuit design, the IO of the MCU (microprocessor controller) we often use is usually connected to directly drive the peripheral circuit without isolation. When the current is too large or there is a surge, it will cause the MCU and other components to be directly burned out.

[0003] In view of this, it is necessary to provide a new type of isolation module control circuit to overcome the above defects. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an isolation module control circuit, which can effectively achieve electrical isolation, ensure the anti-interference ability of the overall circuit, play a good protection role for the circuit, and at the same time reduce the maintenance cost of the product.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is realized as follows: an isolation module control circuit, comprising: a first step-down circuit unit, a second step-down circuit unit, a main control chip U1, an isolation module and an optocoupler module; the first step-down circuit unit is electrically connected to the second step-down circuit unit, the second step-down circuit unit is electrically connected to the main control chip, the isolation module is electrically connected to the first step-down circuit unit, and the optocoupler module is electrically connected to the isolation module, the second step-down circuit unit and the main control chip U1.

[0006] Preferably, the first step-down circuit unit includes a capacitor C14, a step-down chip U3, a capacitor C13, a Schottky diode D9, an inductor L1, a polarized capacitor C15, a resistor R8 and a resistor R9;

[0007] The first end of the capacitor C14 is electrically connected to the VIN pin of the step-down chip U3 and externally connected to a DC 12V power supply, the second end of the capacitor C14 is grounded, the PH pin of the step-down chip U3 is electrically connected to the cathode of the Schottky diode and the first end of the inductor, the BOOT pin of the step-down chip U3 is electrically connected to the first end of the capacitor C13, the second end of the capacitor C13 is electrically connected to the cathode of the Schottky diode, the PwPd pin and the GND pin of the step-down chip U3 are grounded, the anode of the Schottky diode D9 is grounded, the second end of the inductor L1 is electrically connected to the positive pole of the polarized capacitor C15 and the resistor R8, the resistor R8 is electrically connected to the resistor R9, the resistor R9 is grounded, and the VSENSE pin of the step-down chip U3 is electrically connected between the resistor R8 and the resistor R9.

[0008] Preferably, the second step-down circuit unit includes a step-down chip U5, a diode D10, an inductor FB1, a capacitor C18, a capacitor C19, and a capacitor C20; the IN pin of the step-down chip U5 is electrically connected to the positive electrode of the polarized capacitor C15 of the first step-down circuit unit, the cathode of the diode D10, and the EN pin of the step-down chip U5, the anode of the diode D10 is electrically connected to the OUT pin of the step-down chip U5, the first end of the capacitor C19, the first end of the capacitor C20, and the first end of the inductor FB1, the FB1 pin of the step-down chip U5 is electrically connected to the first end of the capacitor C18, the second end of the capacitor C18 is electrically connected to the second ends of the capacitor C19 and the capacitor C20 and grounded, and the second end of the inductor FB1 is electrically connected to the main control chip U1.

[0009] Preferably, the isolation module includes a capacitor C40, an isolation chip U11, and a capacitor C41; the first end of the capacitor C40 is electrically connected to the VIN pin of the isolation chip U11 and the positive electrode of the polarized capacitor C15 of the first step-down circuit unit, the GND pin of the isolation chip U11 is electrically connected to the second end of the capacitor C40 and grounded, the +VO pin of the isolation chip U11 is electrically connected to the first end of the capacitor C41, and the 0V pin of the isolation chip U11 is electrically connected to the second end of the capacitor C41 and grounded.

[0010] Preferably, the optocoupler module includes a resistor R34, a resistor R37, an opto-isolator U13, a resistor R35, and a capacitor C43;

[0011] The first end of the resistor R34 is electrically connected to the first end of the resistor R37 and the +VO pin of the isolation chip U11, the second end of the resistor R34 is electrically connected to the anode of the light emitter of the opto-isolator U13, the second end of the resistor R37 is electrically connected to the external control input terminal, the first end of the capacitor C45, and the cathode of the light emitter of the opto-isolator U13, and the capacitor C45 is grounded;

[0012] One end of the light receiver of the opto-isolator U13 is electrically connected to the first end of the capacitor C43, the first end of the resistor R35, and the PA6 pin of the main control chip U1, the other end of the light receiver of the opto-isolator U13 is electrically connected to the second end of the capacitor C43 and grounded, and the second end of the resistor R35 is electrically connected to the second end of the inductor FB1 of the second step-down circuit unit.

[0013] Preferably, the model of the main control chip U1 is STM32F103RET6, the model of the step-down chip U3 is TPS5430, the model of the isolation chip U11 is IB0505LS, and the model of the opto-isolator is PC817SC.

[0014] Compared with the prior art, the beneficial effects are as follows. The first step-down circuit unit is used to externally connect a DC 12V power supply and convert the DC 12V power supply into a DC 5V power supply, which is output to the second step-down circuit unit and the isolation module. The second step-down circuit unit converts the DC 5V power supply into a DC 3.3V power supply and outputs it to the main control chip U1, enabling the main control chip U1 to work properly. The isolation module provides protection for the main control chip U11, preventing equipment damage or failure caused by overcurrent or voltage surges, effectively achieving electrical isolation, ensuring the anti-interference ability of the overall circuit, playing a good protective role for the circuit, and at the same time reducing the maintenance cost of the product.

[0015] Other features and advantages of the present utility model will be described in the following description, and some will be obvious from the description, or can be understood through the implementation of the present utility model. The features and advantages of the present utility model can be achieved and obtained through the elements and combinations specifically pointed out in the appended claims. These and other features of the present utility model will become more clear and understandable according to the following description and the appended claims, or can be understood through the implementation of the embodiments described in the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0017] Figure 1 It is the circuit diagram of the first step-down circuit unit of the isolation module control circuit provided by the present utility model.

[0018] Figure 2 It is the circuit diagram of the second step-down circuit unit.

[0019] Figure 3 It is the circuit diagram of the main control chip.

[0020] Figure 4 It is the circuit diagram of the isolation module.

[0021] Figure 5 It is the circuit diagram of the optocoupler module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the purpose, technical solutions and beneficial technical effects of the present utility model clearer, the following further details the present utility model in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present utility model, and not for limiting the present utility model.

[0023] It should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0024] It should also be noted that unless otherwise clearly specified and limited, terms such as "installed", "connected", "joined", "fixed", "set", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be determined according to specific circumstances.

[0025] In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In addition, the meanings of "multiple" and "several" refer to two or more, unless otherwise clearly and specifically defined.

[0026] Please refer to Figures 1 to 5 , the present utility model provides an isolation module control circuit, including: a first step-down circuit unit, a second step-down circuit unit, a main control chip U1, an isolation module, and an optocoupler module; the first step-down circuit unit is electrically connected to the second step-down circuit unit, the second step-down circuit unit is electrically connected to the main control chip, the isolation module is electrically connected to the first step-down circuit unit, and the optocoupler module is electrically connected to the isolation module, the second step-down circuit unit, and the main control chip U1.

[0027] In this way, the first step-down circuit unit is used to externally connect a DC 12V power supply and convert the DC 12V power supply into a DC 5V power supply and output it to the second step-down circuit unit and the isolation module. The second step-down circuit unit converts the DC 5V power supply into a DC 3.3V power supply and outputs it to the main control chip U1, enabling the main control chip U1 to operate normally. The isolation module provides protection for the main control chip U11 to prevent equipment damage or failure caused by overcurrent or voltage surges.

[0028] In a preferred embodiment, the first step-down circuit unit includes a capacitor C14, a step-down chip U3, a capacitor C13, a Schottky diode D9, an inductor L1, a polarized capacitor C15, a resistor R8, and a resistor R9;

[0029] The first end of the capacitor C14 is electrically connected to the VIN pin of the step-down chip U3 and externally connected to a DC 12V power supply, the second end of the capacitor C14 is grounded, the PH pin of the step-down chip U3 is electrically connected to the cathode of the Schottky diode and the first end of the inductor, the BOOT pin of the step-down chip U3 is electrically connected to the first end of the capacitor C13, the second end of the capacitor C13 is electrically connected to the cathode of the Schottky diode, the PwPd pin and the GND pin of the step-down chip U3 are grounded, the anode of the Schottky diode D9 is grounded, the second end of the inductor L1 is electrically connected to the positive electrode of the polarized capacitor C15 and the resistor R8, the resistor R8 is electrically connected to the resistor R9, the resistor R9 is grounded, and the VSENSE pin of the step-down chip U3 is electrically connected between the resistor R8 and the resistor R9.

[0030] In a preferred embodiment, the second step-down circuit unit includes a step-down chip U5, a diode D10, an inductor FB1, a capacitor C18, a capacitor C19, and a capacitor C20; the IN pin of the step-down chip U5 is electrically connected to the positive electrode of the polarized capacitor C15 of the first step-down circuit unit, the cathode of the diode D10, and the EN pin of the step-down chip U5, the anode of the diode D10 is electrically connected to the OUT pin of the step-down chip U5, the first end of the capacitor C19, the first end of the capacitor C20, and the first end of the inductor FB1, the FB1 pin of the step-down chip U5 is electrically connected to the first end of the capacitor C18, the second end of the capacitor C18 is electrically connected to the second ends of the capacitor C19 and the capacitor C20 and grounded, and the second end of the inductor FB1 is electrically connected to the main control chip U1.

[0031] In this way, the step-down chip U3 converts the DC 12V power supply into a DC 5V power supply and outputs it to the positive electrode of the polarized capacitor C15. After the step-down chip U5 is connected to the DC 5V power supply, it converts the DC 5V power supply into a DC 3.3V power supply and outputs it to the main control chip U1 to provide a working voltage for the main control chip U1.

[0032] In a preferred embodiment, the isolation module includes a capacitor C40, an isolation chip U11, and a capacitor C41; a first end of the capacitor C40 is electrically connected to a VIN pin of the isolation chip U11 and a positive electrode of a polarized capacitor C15 of the first buck circuit unit, a GND pin of the isolation chip U11 is electrically connected to a second end of the capacitor C40 and grounded, a +VO pin of the isolation chip U11 is electrically connected to a first end of the capacitor C41, and a 0V pin of the isolation chip U11 is electrically connected to a second end of the capacitor C41 and grounded.

[0033] In a preferred embodiment, the optocoupler module includes a resistor R34, a resistor R37, an opto-isolator U13, a resistor R35, and a capacitor C43;

[0034] A first end of the resistor R34 is electrically connected to a first end of the resistor R37 and a +VO pin of the isolation chip U11, a second end of the resistor R34 is electrically connected to an anode of a light emitter of the opto-isolator U13, a second end of the resistor R37 is electrically connected to an external control input terminal, a first end of a capacitor C45, and a cathode of the light emitter of the opto-isolator U13, and the capacitor C45 is grounded;

[0035] One end of a light receiver of the opto-isolator U13 is electrically connected to a first end of the capacitor C43, a first end of the resistor R35, and a PA6 pin of the main control chip U1, the other end of the light receiver of the opto-isolator U13 is electrically connected to a second end of the capacitor C43 and grounded, and a second end of the resistor R35 is electrically connected to a second end of an inductor FB1 of the second buck circuit unit.

[0036] It should be noted that, in this embodiment, the model of the main control chip U1 is STM32F103RET6, the model of the buck chip U3 is TPS5430, the model of the voltage chip U5 is TPS7373, the model of the isolation chip U11 is IB0505LS, and the model of the opto-isolator is PC817SC.

[0037] In this way, the isolation chip U11 isolates the DC 5V power supply and outputs a DC power supply +VO of the same 5V. The isolated DC power supply +VO is connected to the opto-isolator U13. That is, first, an external input voltage IN1 is used to light the light emitter of the opto-isolator U13. The light generated by the light emitter of the opto-isolator U13 causes the light receiver to conduct and output a low level to the main control chip U1, which realizes the isolation input of the switch state.

[0038] It should be noted that the number of the optocoupler modules can be multiple. In this embodiment, the number of the optocoupler modules is five, which can be selected and used according to actual application requirements. The optoelectronic isolator U13 (PC817SC) is used for isolation, so that the input and output are not grounded together, which can effectively achieve electrical isolation, ensure the anti-interference ability of the overall circuit, play a good protective role for the circuit, and at the same time reduce the maintenance cost of the product.

[0039] The present utility model is not limited only to what is described in the specification and embodiments. Therefore, for those skilled in the art, additional advantages and modifications can be easily achieved. Thus, without departing from the spirit and scope of the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details, representative devices, and illustrated examples shown and described herein.

Claims

1. An isolation module control circuit, characterized in that: include: A first buck circuit unit, a second buck circuit unit, a main control chip U1, an isolation module and an optocoupler module; the first buck circuit unit is electrically connected to the second buck circuit unit, the second buck circuit unit is electrically connected to the main control chip, the isolation module is electrically connected to the first buck circuit unit, and the optocoupler module is electrically connected to the isolation module, the second buck circuit unit and the main control chip U1.

2. The isolation module control circuit according to claim 1, characterized in that: The first step-down circuit unit includes a capacitor C14, a step-down chip U3, a capacitor C13, a Schottky diode D9, an inductor L1, a polarized capacitor C15, a resistor R8 and a resistor R9; The first end of the capacitor C14 is electrically connected to the VIN pin of the buck chip U3 and is externally connected to a DC 12V power supply. The second end of the capacitor C14 is grounded. The PH pin of the buck chip U3 is electrically connected to the cathode of the Schottky diode and the first end of the inductor. The BOOT pin of the buck chip U3 is electrically connected to the first end of the capacitor C13. The second end of the capacitor C13 is electrically connected to the cathode of the Schottky diode. The PwPd pin and the GND pin of the buck chip U3 are grounded. The anode of the Schottky diode D9 is grounded. The second end of the inductor L1 is electrically connected to the positive electrode of the polarized capacitor C15 and the resistor R8. The resistor R8 is electrically connected to the resistor R9, and the resistor R9 is grounded. The VSENSE pin of the buck chip U3 is electrically connected between the resistor R8 and the resistor R9.

3. The isolation module control circuit according to claim 1, characterized in that: The second step-down circuit unit includes a step-down chip U5, a diode D10, an inductor FB1, a capacitor C18, a capacitor C19 and a capacitor C20; the IN pin of the step-down chip U5 is electrically connected to the positive electrode of the polarized capacitor C15 of the first step-down circuit unit, the cathode of the diode D10 and the EN pin of the step-down chip U5, the anode of the diode D10 is electrically connected to the OUT pin of the step-down chip U5, the first end of the capacitor C19, the first end of the capacitor C20 and the first end of the inductor FB1, the FB1 pin of the step-down chip U5 is electrically connected to the first end of the capacitor C18, the second end of the capacitor C18 is electrically connected to the second end of the capacitor C19 and the second end of the capacitor C20 and is grounded, and the second end of the inductor FB1 is electrically connected to the main control chip U1.

4. The isolation module control circuit according to claim 2, characterized in that: The isolation module includes a capacitor C40, an isolation chip U11 and a capacitor C41; the first end of the capacitor C40 is electrically connected to the VIN pin of the isolation chip U11 and the positive pole of the polarized capacitor C15 of the first step-down circuit unit, the GND pin of the isolation chip U11 is electrically connected to the second end of the capacitor C40 and is grounded, the +VO pin of the isolation chip U11 is electrically connected to the first end of the capacitor C41, and the 0V pin of the isolation chip U11 is electrically connected to the second end of the capacitor C41 and is grounded.

5. The isolation module control circuit according to claim 3, characterized in that: The optical coupling module includes a resistor R34, a resistor R37, a photoelectric isolator U13, a resistor R35 and a capacitor C43; The first end of the resistor R34 is electrically connected to the first end of the resistor R37 and the +VO pin of the isolation chip U11, the second end of the resistor R34 is electrically connected to the anode of the light emitter of the photoelectric isolator U13, the second end of the resistor R37 is electrically connected to the external control input terminal, the first end of the capacitor C45 and the cathode of the light emitter of the photoelectric isolator U13, and the capacitor C45 is grounded; One end of the light receiver of the photoelectric isolator U13 is electrically connected to the first end of the capacitor C43, the first end of the resistor R35 and the PA6 pin of the main control chip U1, the other end of the light receiver of the photoelectric isolator U13 is electrically connected to the second end of the capacitor C43 and grounded, and the second end of the resistor R35 is electrically connected to the second end of the inductor FB1 of the second buck circuit unit.

6. The isolation module control circuit according to claim 5, characterized in that: The model of the main control chip U1 is STM32F103RET6, the model of the buck chip U3 is TPS5430, the model of the isolation chip U11 is IB0505LS, and the model of the photoelectric isolator is PC817SC.

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