Optocoupler isolation signal processing circuit and electric equipment

Abstract

The utility model relates to an optocoupler isolation signal processing circuit and electric equipment, and the processing circuit comprises a signal conversion circuit which is used for converting a control signal, and the voltage of the control signal is a first level or a second level; the signal extraction circuit comprises a first power supply, a first resistor and a first diode; the cathode of the first diode is the input end of the signal extraction circuit, the input end of the signal extraction circuit is connected with the output end of the signal conversion circuit, and the signal extraction circuit is used for determining the voltage value of the output end of the signal extraction circuit according to the first level or the second level; the input pin of the microcontroller unit is connected with the output end of the signal extraction circuit, and the microcontroller unit is used for reading the voltage value of the output end of the signal extraction circuit. According to the invention, the state information of the control signal can be correctly read by the microcontroller unit, the design of the whole processing circuit is simplified, and the cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of signal processing circuits, and in particular to an optocoupler isolation signal processing circuit and an electrical device. Background Art

[0002] By utilizing the photoelectric isolation characteristics of optocouplers, it is possible to control strong current loads with weak current control signals. When the microcontroller unit (MCU) at the strong current end needs to further regulate other parts of the circuit based on the real-time control status of a strong current load with weak current control signals, the MCU must continuously monitor this control status to ensure stable operation and efficient management of the entire system.

[0003] Normally, the voltage levels of high-voltage loads and MCUs are not the same. The traditional solution is to use additional optocouplers to transmit control signals to the MCU, or to add a voltage conversion circuit to the optocoupler to convert the control signal into a voltage suitable for the MCU to read. However, all of the above methods require an increase in the number of peripheral circuits and components, which not only increases the risk of circuit failure, but also increases the cost and volume of the system. In addition, due to the timing of the transmission of control signals between multiple components, the response speed of the MCU may be relatively slow. Summary of the invention

[0004] In order to solve at least one of the above-mentioned technical problems, the present disclosure provides an optical coupling isolation signal processing circuit and an electrical device.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided an optocoupler isolation signal processing circuit, the processing circuit comprising:

[0006] A signal conversion circuit, used for converting a control signal, wherein the voltage of the control signal is a first level or a second level;

[0007] A signal extraction circuit, the signal extraction circuit comprising a first power supply, a first resistor and a first diode; the cathode of the first diode is the input end of the signal extraction circuit, the input end of the signal extraction circuit is connected to the output end of the signal conversion circuit, and the signal extraction circuit is used to determine the voltage value of the output end of the signal extraction circuit according to the first level or the second level;

[0008] A microcontroller unit, wherein an input pin of the microcontroller unit is connected to an output end of the signal extraction circuit, and is used to read a voltage value of the output end of the signal extraction circuit.

[0009] In one embodiment, the first end of the first resistor is connected to the first power source;

[0010] The second end of the first resistor is connected to the anode of the first diode, and the connection node thereof is the output end of the signal extraction circuit.

[0011] In one embodiment, the signal conversion circuit includes a photocoupler;

[0012] The photocoupler includes a first transistor and a second diode;

[0013] The second diode is the input end of the photocoupler, and the first transistor is the output end of the photocoupler; the first end of the first transistor is used to output the control signal, and the second end of the first transistor is grounded.

[0014] In one embodiment, the processing circuit further comprises a signal generating device, wherein the signal generating device is used to generate the control signal;

[0015] The output end of the signal generating device is connected to the input end of the photoelectric coupler for transmitting the control signal to the photoelectric coupler.

[0016] In one embodiment, the first end of the first transistor is connected to the cathode of the first diode, so that when the voltage of the control signal is the first level and the photocoupler is in the on state, the voltage of the cathode of the first diode is the first level, so that the signal extraction circuit outputs the signal of the first level.

[0017] In one embodiment, the processing circuit further includes a first load control circuit;

[0018] The first load control circuit includes a second resistor, a second transistor and a first high-current load, wherein the first end of the second resistor is connected to the first end of the first transistor, and the second end of the second resistor is connected to the control end of the second transistor, and is used for transmitting the control signal to the control end of the second transistor when the voltage of the control signal is the first level and the photocoupler is in an on state, so that the first high-current load works.

[0019] In one embodiment, the first load control circuit further includes a second power supply and a third resistor;

[0020] The first end of the third resistor is connected to the second power supply, the second end of the third resistor is connected to the second end of the second resistor, and the first end of the second resistor is connected to the cathode of the first diode, so that the voltage of the cathode of the first diode is the voltage of the second power supply when the voltage of the control signal is the second level and the photocoupler is in a cut-off state.

[0021] In one embodiment, the voltage of the first power supply is less than the voltage of the second power supply, and is used to enable the first resistor and the first power supply to drive the signal extraction circuit to output the signal of the second level when the voltage of the control signal is at the second level and the optocoupler is in a cut-off state.

[0022] In one embodiment, the processing circuit further includes a second load control circuit;

[0023] The second load control circuit includes a third transistor, a second high-current load, a third power supply and a fourth resistor; the first end of the second high-current load is connected to the third power supply, the second end of the second high-current load is connected to the third transistor, the first end of the fourth resistor is connected to the control end of the third transistor, and the second end of the fourth resistor is connected to the output pin of the microcontroller unit, so as to output the signal of the first level in the signal extraction circuit, and when the microcontroller unit reads the signal of the first level, the microcontroller unit controls the second high-current load to work according to the signal of the first level.

[0024] According to a second aspect of an embodiment of the present disclosure, an electrical device is provided, wherein the electrical device comprises an optocoupler isolation signal processing circuit as described in any one of the first aspects.

[0025] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0026] The implementation of this disclosure has the following beneficial effects:

[0027] A simple signal extraction circuit structure is constructed by combining a first power supply, a first resistor and a first diode. The first diode has an adjustable conduction state, so that it can quickly and accurately respond to the voltage of the control signal, and then determine the voltage value of the output end of the signal extraction circuit to ensure that the microcontroller unit can correctly read the status information of the control signal; integrating the signal conversion circuit and the signal extraction circuit reduces the number of external components required and simplifies the design of the entire processing circuit, which can not only reduce costs but also reduce the risk of circuit failure.

[0028] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions and advantages in the embodiments of this specification or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A module schematic diagram of an optocoupler isolation signal processing circuit according to an embodiment of the present disclosure is shown.

[0031] Figure 2 A schematic diagram of the overall structure of an optocoupler isolation signal processing circuit according to an embodiment of the present disclosure is shown.

[0032] Figure 3 A circuit schematic diagram of an optocoupler isolation signal processing circuit according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0035] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0036] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0037] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0038] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0039] Figure 1 FIG. 1 is a schematic diagram of a module of an optocoupler isolation signal processing circuit according to an embodiment of the present disclosure. Figure 1 The optocoupler isolation signal processing circuit includes a signal conversion circuit 10, a signal extraction circuit 20 and a microcontroller unit 30. The signal conversion circuit 10 is used to convert a control signal, and the voltage of the control signal is a first level or a second level. In one embodiment, the first level is a low level and the second level is a high level. The high level represents a voltage value higher than a preset threshold, and the low level represents a voltage value lower than the preset threshold. The present disclosure does not limit the specific value of the preset threshold. In practical applications, the threshold can be flexibly set and adjusted according to system requirements and working conditions.

[0040] Figure 3 FIG. 1 is a circuit diagram of an optocoupler isolation signal processing circuit according to an embodiment of the present disclosure. Figure 3 The signal extraction circuit 20 includes a first power supply VCC1, a first resistor R1 and a first diode D1. The cathode of the first diode D1 is the input end of the signal extraction circuit 20. The input end of the signal extraction circuit 20 is connected to the output end of the signal conversion circuit 10. The signal extraction circuit 20 is used to determine the voltage value Uo of the output end of the signal extraction circuit 20 according to the first level or the second level. The first resistor R1 and the first power supply VCC1 provide a stable voltage source for the signal extraction circuit 20. The input pin of the microcontroller unit 30 is connected to the output end of the signal extraction circuit 20, and is used to read the voltage value Uo of the output end of the signal extraction circuit 20.

[0041] like Figure 3 The first end of the first resistor R1 is connected to the first power supply VCC1, and the second end of the first resistor R1 is connected to the anode of the first diode D1, and the connection node Uo is the output end of the signal extraction circuit 20. The second end of the first resistor R1 is connected to the anode of the first diode D1, and the reverse withstand voltage characteristic of the first diode D1 is used to effectively protect the microcontroller unit 30 from the influence of the reverse voltage. At the same time, the forward conduction characteristic of the first diode D1 is used to ensure that the microcontroller unit 30 can correctly read the state information of the control signal Ui n.

[0042] A simple signal extraction circuit structure is constructed by combining the first power supply VCC1, the first resistor R1 and the first diode D1. The first diode D1 has an adjustable conduction state, so that it can respond quickly and accurately to the voltage of the control signal Uin, and then determine the voltage value of the output end of the signal extraction circuit 20 to ensure that the microcontroller unit 30 can correctly read the status information of the control signal Uin.

[0043] Figure 2 FIG. 2 shows a schematic diagram of the overall structure of an optocoupler isolation signal processing circuit according to an embodiment of the present disclosure. Figure 2 and Figure 3 The signal conversion circuit 10 includes a photocoupler U2, which includes a first transistor Q1 and a second diode D2. The second diode D2 is the input end of the photocoupler U2, the first transistor Q1 is the output end of the photocoupler U2, the first end of the first transistor Q1 is used to output the control signal Uin, and the second end of the first transistor Q1 is grounded. The photocoupler U2 separates the input and output circuits by optical isolation, thereby achieving electrical isolation, which can prevent high voltage or high current interference signals from affecting the output of the control signal Uin.

[0044] In one embodiment, Figure 2 The optocoupler isolation signal processing circuit also includes a signal generating device, which is used to generate a control signal Uin. The output end of the signal generating device is connected to the input end of the optocoupler U2, and is used to transmit the control signal Uin to the optocoupler U2. The signal generating device is connected to the optocoupler U2, and transmits the control signal Uin to the optocoupler U2, so that the signal generating device is separated from other parts in the circuit, thereby providing electrical isolation, helping to prevent external interference from affecting the signal generating device, and improving the safety and stability of the signal generating device.

[0045] In one embodiment, the first end of the first transistor Q1 is connected to the cathode of the first diode D1, and is used for when the voltage of the control signal Uin is at the first level and the photocoupler U2 is in the on state, the voltage of the cathode of the first diode D1 is at the first level, so that the signal extraction circuit 20 outputs the signal Uo of the first level. Specifically, the voltage of the cathode of the first diode D1 is at the first level, the voltage of the anode of the first diode D1 is the voltage of VCC1, the voltage of the anode of the first diode D1 is greater than the voltage of the cathode, so that the first diode D1 is in the on state, generating a conduction voltage drop, the voltage of the anode of the first diode D1 is close to the conduction voltage drop value, the conduction voltage drop value is lower than 0.7V, and the signal extraction circuit 20 outputs a low-level signal Uo. By connecting the first end of the first transistor Q1 to the cathode of the first diode D1, when the control signal Uin is at a low level, it can be correctly processed by the signal extraction circuit 20, the signal extraction circuit 20 implements the logic conversion of the control signal Uin, and outputs the low-level signal Uo, so that the microcontroller unit 30 can correctly read the state information of the control signal Uin.

[0046] The optical coupling isolation signal processing circuit also includes a first load control circuit 40 and a second load control circuit 50, the first load control circuit 40 includes a second resistor R2, a second transistor Q2 and a first strong electric load M1, the first end of the second resistor R2 is connected to the first end of the first transistor Q1, and the second end of the second resistor R2 is connected to the control end of the second transistor Q2, and is used for when the voltage of the control signal Ui n is the first level and the photoelectric coupler U2 is in the on state, the control signal Ui n is transmitted to the control end of the second transistor Q2, so that the first strong electric load M1 works. The first load control circuit is connected to the first transistor Q1, so that when the photoelectric coupler U2 is in the on state, the second transistor Q2 can accurately control the working state of the first strong electric load M1 according to the control signal Ui n.

[0047] The second load control circuit 50 includes a third transistor Q3, a second strong electric load M2, a third power supply VCC3 and a fourth resistor R4, wherein the first end of the second strong electric load M2 is connected to the third power supply VCC3, the second end of the second strong electric load M2 is connected to the third transistor Q3, the first end of the fourth resistor R4 is connected to the control end of the third transistor Q3, and the second end of the fourth resistor R4 is connected to the output pin of the microcontroller unit 30, and is used for outputting a first level signal Uo when the signal extraction circuit 20 outputs the first level signal Uo, and when the microcontroller unit 30 reads the first level signal Uo, the microcontroller unit 30 controls the second strong electric load M2 to work according to the first level signal Uo. When the control signal Ui n is at a low level, the control signal Ui n controls the first strong electric load M1 to work, and at the same time, the signal extraction circuit 20 extracts the state information of the control signal Ui n, outputs a low level signal Uo, and the microcontroller unit 30 reads the low level signal Uo, controls the second strong electric load M2 to work, and realizes the linkage between the first strong electric load M1 and the second strong electric load M2. The microcontroller unit 30 can correctly read the status information of the control signal Ui n, so that the working state of the second high-voltage load M2 can be accurately controlled according to the read information, ensuring that the second high-voltage load M2 works under correct conditions and reducing the risk of errors.

[0048] In one embodiment, the first load control circuit 40 further includes a second power supply VCC2 and a third resistor R3, wherein a first end of the third resistor R3 is connected to the second power supply VCC2, a second end of the third resistor R3 is connected to the second end of the second resistor R2, and a first end of the second resistor R2 is connected to the cathode of the first diode D1, and is used to make the voltage of the cathode of the first diode D1 the voltage of the second power supply VCC2 when the voltage of the control signal Ui n is the second level and the photocoupler U2 is in the cut-off state. When the voltage of the control signal Ui n is the second level, the voltage of the cathode of the first diode D1 is the voltage of the second power supply VCC2, ensuring that the input end of the signal extraction circuit 20 can accurately capture the state of the first load control circuit 40, thereby ensuring that the microcontroller unit 30 can correctly extract the state information of the control signal Ui n.

[0049] The voltage of the first power supply VCC1 is less than the voltage of the second power supply VCC2, and is used to make the first resistor R1 and the first power supply VCC1 drive the signal extraction circuit 20 to output the second level signal Uo when the voltage of the control signal Ui n is the second level and the photocoupler U2 is in the cut-off state. Specifically, when the voltage of the first power supply VCC1 is less than the voltage of the second power supply VCC2, the voltage of the anode of the first diode D1 is less than the voltage of the cathode, so that the first diode D1 is in the cut-off state, and further, the voltage of the output end of the signal extraction circuit 20 is the voltage of the first power supply VCC1, and the voltage of the first power supply VCC1 is high level. The microcontroller unit 30 reads the high level signal and will not trigger the second strong electric load M2 to enter the working state. The voltage of the first power supply VCC1 is less than the voltage of the second power supply VCC2, and the first diode D1 is in the cut-off state, so that the output end of the signal extraction circuit 20 is high level, thereby accurately extracting the state information of the control signal Ui n, and ensuring that the microcontroller unit 30 can accurately perform the control operation of the subsequent circuit based on the read information.

[0050] The embodiments of the present disclosure also provide an electrical device including the above-mentioned optocoupler isolation signal processing circuit. The present disclosure does not limit the electrical device, and it may be an air conditioner, an oven, etc. The first high-voltage load may be a component of the main function of the air conditioner or the oven, such as a compressor in an air conditioner or a heater in an oven, and the second high-voltage load may be a component of an auxiliary function, such as a temperature sensor, a humidity sensor, etc. By precisely controlling the working state of the second high-voltage load, the energy efficiency of the electrical device can be effectively improved and energy consumption can be reduced; ensuring that the second high-voltage load works under the correct conditions reduces the risk of errors in the electrical device and enhances the safety of the electrical device; at the same time, peripheral devices and components can be reduced, reducing the cost of the electrical device and improving the integration of the electrical device.

[0051] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An optocoupler isolation signal processing circuit, characterized in that: The processing circuit comprises: A signal conversion circuit, used for converting a control signal, wherein the voltage of the control signal is a first level or a second level; A signal extraction circuit, the signal extraction circuit comprising a first power supply, a first resistor and a first diode; the cathode of the first diode is the input end of the signal extraction circuit, the input end of the signal extraction circuit is connected to the output end of the signal conversion circuit, and the signal extraction circuit is used to determine the voltage value of the output end of the signal extraction circuit according to the first level or the second level; A microcontroller unit, wherein an input pin of the microcontroller unit is connected to an output end of the signal extraction circuit, and is used to read a voltage value of the output end of the signal extraction circuit.

2. The optical coupler isolation signal processing circuit according to claim 1, characterized in that: The first end of the first resistor is connected to the first power supply; The second end of the first resistor is connected to the anode of the first diode, and the connection node thereof is the output end of the signal extraction circuit.

3. The optical coupler isolation signal processing circuit according to claim 2, characterized in that: The signal conversion circuit includes a photocoupler; The photocoupler includes a first transistor and a second diode; The second diode is the input end of the photocoupler, and the first transistor is the output end of the photocoupler; the first end of the first transistor is used to output the control signal, and the second end of the first transistor is grounded.

4. The optical coupler isolation signal processing circuit according to claim 3, characterized in that: The processing circuit further comprises a signal generating device, the signal generating device being configured to generate the control signal; The output end of the signal generating device is connected to the input end of the photoelectric coupler for transmitting the control signal to the photoelectric coupler.

5. The optical coupler isolation signal processing circuit according to claim 4, characterized in that: The first end of the first transistor is connected to the cathode of the first diode, and is used for, when the voltage of the control signal is the first level and the photocoupler is in the on state, the voltage of the cathode of the first diode is the first level, so that the signal extraction circuit outputs the signal of the first level.

6. The optical coupler isolation signal processing circuit according to claim 5, characterized in that: The processing circuit also includes a first load control circuit; The first load control circuit includes a second resistor, a second transistor and a first high-current load, wherein the first end of the second resistor is connected to the first end of the first transistor, and the second end of the second resistor is connected to the control end of the second transistor, and is used for transmitting the control signal to the control end of the second transistor when the voltage of the control signal is the first level and the photocoupler is in an on state, so that the first high-current load works.

7. The optical coupler isolation signal processing circuit according to claim 6, characterized in that: The first load control circuit also includes a second power supply and a third resistor; The first end of the third resistor is connected to the second power supply, the second end of the third resistor is connected to the second end of the second resistor, and the first end of the second resistor is connected to the cathode of the first diode, so that the voltage of the cathode of the first diode is the voltage of the second power supply when the voltage of the control signal is the second level and the photocoupler is in a cut-off state.

8. The optical coupler isolation signal processing circuit according to claim 7, characterized in that: The voltage of the first power supply is lower than the voltage of the second power supply, and is used to enable the first resistor and the first power supply to drive the signal extraction circuit to output the signal of the second level when the voltage of the control signal is at the second level and the photocoupler is in the cut-off state.

9. The optical coupler isolation signal processing circuit according to claim 6, characterized in that: The processing circuit also includes a second load control circuit; The second load control circuit includes a third transistor, a second high-current load, a third power supply and a fourth resistor; the first end of the second high-current load is connected to the third power supply, the second end of the second high-current load is connected to the third transistor, the first end of the fourth resistor is connected to the control end of the third transistor, and the second end of the fourth resistor is connected to the output pin of the microcontroller unit, so as to output the signal of the first level in the signal extraction circuit, and when the microcontroller unit reads the signal of the first level, the microcontroller unit controls the second high-current load to work according to the signal of the first level.

10. An electrical device, characterized in that: The electrical equipment includes the optocoupler isolation signal processing circuit as described in any one of claims 1-9.

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