Anti-reflux switch control circuit applied to alternating current output

Abstract

The utility model discloses an anti-reflux switch control circuit applied to AC output, which relates to the technical field of control circuits and comprises an input power supply module, a switch control module, an AC working module and an MCU (Microprogrammed Control Unit) control module, the input power supply module is used for providing output power and energy required in the working process, one end of the input power supply module is connected with the switch control module, one end of the switch control module is connected with the alternating current working module, one end of the alternating current working module is connected with the MCU control module, and the other end of the MCU control module is connected with the input power supply module. According to the utility model, the time-sharing work of the input power supply module and the AC working module is utilized, and the switch control module connects and disconnects the two loops, so that the mutual influence of the working time of the input power supply module and the AC working module is avoided, the impedance matching problem is solved, and the requirement of simple circuit structure is met to a greater extent.

Description

Technical Field

[0001] This utility model relates to the field of control circuit technology, and more specifically, to a switch control circuit for preventing backflow in AC output. Background Technology

[0002] With the rapid development of electronic technology, the integration and modularity of control circuit systems are constantly improving, and the interconnection between different functional modules has become a crucial aspect of control circuit design. In practical applications, the connection between circuit modules needs to consider various factors, including signal integrity, power transmission efficiency, and system stability. Especially in control circuit systems involving AC output, due to differences in circuit characteristics, the connection method between modules directly affects the performance of the entire system. A reasonable control circuit connection design is of great significance for ensuring the reliable operation of the system.

[0003] Currently, when connecting control circuits with two or more operating characteristics, their characteristic impedances must be matched. If the two circuits are not well matched, the output circuit will seriously affect the input circuit, even damaging components and causing the circuit to malfunction. To enable the circuit's application, the output AC impedance of the preceding circuit (such as a DC / AC power supply module) needs to be increased. To achieve impedance matching, matching components such as series equivalent inductors are usually added to the preceding circuit. By adjusting circuit parameters, the impedance matching requirements between different modules are met, thereby ensuring the stable operation of the control circuit system and the quality of signal transmission.

[0004] Patent application number 202320965368.6 discloses a radio frequency front-end impedance control circuit, including a radio frequency front-end circuit, an antenna, a directional coupler, a low-noise amplifier circuit, a second switch, and a second resistor; the directional coupler is disposed between the radio frequency front-end circuit and the antenna, and the low-noise amplifier circuit is grounded through the second switch and the second resistor connected in series; the second resistor performs impedance conversion through the first inductor, so that the power amplifier can work normally.

[0005] However, the above-mentioned control circuit has the following shortcomings in practical applications: the existing impedance matching method still requires the use of a large series equivalent inductor to achieve a good impedance matching effect, which not only increases the overall size of the control circuit system, but also leads to higher power loss; secondly, the use of matching components significantly increases the manufacturing cost of the control circuit system; in addition, when designing the control circuit, it is also necessary to fully consider the structural characteristics of each module, which makes the design and application of the circuit more complex. These problems seriously restrict the miniaturization development and practical application promotion of the control circuit system.

[0006] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0007] In view of the problems in the related technologies, this utility model proposes a switch control circuit for preventing backflow in AC output, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0008] Therefore, the specific technical solution adopted by this utility model is as follows:

[0009] A switch control circuit for AC output backflow prevention includes an input power module, a switch control module, an AC operating module, and an MCU control module. The input power module provides the output power and energy required during operation. One end of the input power module is connected to the switch control module, one end of the switch control module is connected to the AC operating module, one end of the AC operating module is connected to the MCU control module, the MCU control module is responsible for system detection and control, and the other end of the MCU control module is connected to the input power module.

[0010] Optionally, the switch control module is used to connect and disconnect the input power module and the AC working module. The switch control module includes a resistor R1, a capacitor C1 and a switch device N1. The first terminal of the switch device N1 is connected to the second output terminal of the input power module, the second terminal of the switch device N1 is connected to the AC working module, and the third terminal of the switch device N1 is connected to one end of the resistor R1.

[0011] Optionally, resistor R1 and capacitor C1 form a parallel circuit. One end of the parallel circuit is connected to the third terminal of switching device N1 and the MCU control module, and the other end of the parallel circuit is connected to the second output terminal of the input power module, the first terminal of switching device N1, and the MCU control module.

[0012] Optionally, the AC working module is directly connected to the input power module. The AC working module is used to receive signals from the MCU control module and output them. The AC working module includes a capacitor C2, a diode D2, a switching device N2, and an inductor L1.

[0013] Optionally, one end of capacitor C2 is connected to the first output terminal of the input power module and inductor L1, the other end of C2 is connected to the positive terminal of diode D2, the first terminal of switching device N2 and the switching control module, the second terminal of switching device N2 is connected to the negative terminal of diode D2 and the other end of inductor L1, and the third terminal of switching device N2 is connected to the MCU control module.

[0014] Optionally, a diode D1 is provided between the AC working module and the input power module. The negative terminal of the diode D1 is connected to the AC working module and the MCU control module, and the positive terminal of the diode D1 is connected to the first output terminal of the input power module.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. This utility model utilizes the time-sharing operation of the input power module and the AC working module, and connects and disconnects the two circuits by the switching device N1 in the switch control module, thus avoiding the mutual interference of the working time of the input power module and the AC working module. The circuit cost is low and the economic benefits are high. At the same time, the resistor R1 and capacitor C1 in the switch control module form a parallel circuit, which works in conjunction with the switching device N1 to achieve precise control of the connection between the input power module and the AC working module. This innovative control method not only simplifies the circuit structure, but also improves the reliability and stability of the control circuit system.

[0017] 2. The switch control circuit of this utility model realizes precise control and real-time monitoring of the system's working state through the MCU control module, which can effectively prevent the occurrence of back current and protect the safety of circuit components. The coordinated work of capacitor C2, diode D2, switching device N2 and inductor L1 in the AC working module ensures the stable operation of the circuit in different working modes. In particular, the connection method between diode D1 and the input power module further enhances the circuit's anti-back current capability, enabling the system to maintain good performance even in complex working environments.

[0018] 3. This utility model avoids the complex parameter adjustment process in traditional impedance matching methods, making circuit design and debugging simpler and more intuitive; through the cooperation of switching devices N1 and N2, intelligent switching between the input power module and the AC working module is realized, eliminating the need for impedance matching using large series equivalent inductors; in addition, the circuit uses standardized electronic components, such as resistors R1, capacitors C1 and C2, and inductor L1, which not only reduces production and maintenance costs but also improves the market competitiveness of the product, demonstrating significant application value and promotion prospects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a circuit diagram of a switch control circuit for preventing backflow in AC output, according to an embodiment of the present invention.

[0021] Figure 2 This is a circuit schematic diagram based on Embodiment 1 of the present invention;

[0022] Figure 3 This is a circuit diagram based on Embodiment 2 of the present invention.

[0023] In the picture:

[0024] 1. Input power module; 2. Switch control module; 3. AC operating module; 4. MCU control module. Detailed Implementation

[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0026] According to an embodiment of the present invention, a switch control circuit for preventing backflow in AC output is provided.

[0027] Example 1

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 and Figure 2 As shown, the switch control circuit for AC output backflow prevention according to an embodiment of the present invention includes an input power module 1, a switch control module 2, an AC working module 3, and an MCU control module 4. The input power module 1 is used to provide the output power and energy required during operation. One end of the input power module 1 is connected to the switch control module 2, one end of the switch control module 2 is connected to the AC working module 3, one end of the AC working module 3 is connected to the MCU control module 4, the MCU control module 4 is responsible for the detection and control of the system, and the other end of the MCU control module 4 is connected to the input power module 1.

[0029] Specifically, a switch control circuit for preventing reverse current in AC output includes an input power module 1 (DC / AC power module), diode D1, capacitor C1, resistor R1, switch device N1, capacitor C2, diode D2, switch device N2, inductor L1, and MCU control module 4. The input power module 1 (DC / AC power module) provides the output power and energy required during operation; resistor R1, capacitor C1, and switch device N1 form the switch control circuit 2; capacitor C2, diode D2, switch device N2, and inductor L1 form the AC operating module 3; the switch control module 2 is responsible for connecting and disconnecting the input power module 1 (DC / AC power module) and the AC operating module 3; and the MCU control module 4 is responsible for the detection and control of the circuit system.

[0030] It should be noted that the input power module 1 in this utility model can be a standard power module such as a switching power supply, inverter power supply or linear power supply with enable control function available on the market; the MCU control module 4 can use a microcontroller (such as STM32F103RCT6) as the core processor, and together with the corresponding peripheral circuits, it can realize real-time monitoring and control of the input power module 1 and the AC working module 3, so as to ensure the stable operation of the entire circuit system.

[0031] By utilizing the above-mentioned technical solution of this utility model, the present utility model avoids the mutual influence of the working time of the input power module 1 and the AC working module 3 by using the time-sharing operation of the input power module 1 and the AC working module 3, and by connecting and disconnecting the two circuits by the switching device N1 in the switch control module 2. This results in low circuit cost and high economic benefits. At the same time, the resistor R1 and capacitor C1 in the switch control module 2 form a parallel circuit, which, together with the switching device N1, achieves precise control of the connection between the input power module 1 and the AC working module 3. This innovative control method not only simplifies the circuit structure, but also improves the reliability and stability of the control circuit system.

[0032] In one embodiment, the switch control module 2 is used to connect and disconnect the input power module 1 from the AC working module 3. The switch control module 2 includes a resistor R1, a capacitor C1, and a switch device N1. The first end of the switch device N1 is connected to the second output end of the input power module 1, the second end of the switch device N1 is connected to the AC working module 3, and the third end of the switch device N1 is connected to one end of the resistor R1. The resistor R1 and the capacitor C1 form a parallel circuit. One end of the parallel circuit is connected to the third end of the switch device N1 and the MCU control module 4, and the other end of the parallel circuit is connected to the second output end of the input power module 1, the first end of the switch device N1, and the MCU control module 4.

[0033] The working principle of the switch control module 2 is as follows: The input power module 1 (DC / AC power module) and the AC working module 3 are connected through the switch control module 2. The two modules are connected in the circuit by the switch device N1. When the input power module 1 needs to output, the MCU control module 4 controls the switch device N1 in the switch control module 2 to open the circuit, so that the circuit between the input power module 1 and the AC working module 3 is connected and the AC working module 3 is powered. When the MCU control module 4 detects that the voltage of the AC working module 3 is the set value, it stops the input power module 1 and then closes the switch device N1 in the switch control module 2. By controlling the third terminal of the switch device N1 to turn it off, a working signal is sent to the AC working module 3. At this time, since the switch device N1 is in the closed state, the circuit is not open, so the output of the AC working module 3 will not affect the input power module 1, thereby effectively preventing the output of the AC working module 3 from affecting the input power module 1. The parallel circuit of resistor R1 and capacitor C1 is used to provide a stable control voltage for the switch device N1 to ensure the reliable switching of the switch device N1.

[0034] In one embodiment, the AC working module 3 is directly connected to the input power module 1. The AC working module 3 is used to receive signals from the MCU control module 4 and output signals. The AC working module 3 includes a capacitor C2, a diode D2, a switching device N2, and an inductor L1. One end of the capacitor C2 is connected to the first output terminal of the input power module 1 and the inductor L1. The other end of the capacitor C2 is connected to the positive terminal of the diode D2, the first terminal of the switching device N2, and the switching control module 2. The second terminal of the switching device N2 is connected to the negative terminal of the diode D2 and the other end of the inductor L1. The third terminal of the switching device N2 is connected to the MCU control module 4.

[0035] The working principle of AC working module 3 is as follows: When MCU control module 4 detects that the voltage of AC working module 3 is at the set value, it stops the input power module 1, then turns off the switching device N1 in switch control module 2. By controlling the third terminal of switching device N1 to turn it off, it sends a working signal to switching device N2 in AC working module 3. Capacitor C2 forms a circuit with switching device N2 through inductor L1. Capacitor C2 discharges through inductor L1, and inductor L1 begins to store energy. When the capacitance of this circuit is discharged to 0, the energy stored in inductor L1 reaches its maximum, switching device N2 turns off, the voltage on inductor L1 reverses, and inductor L1 charges capacitor C2 in reverse through D2. Since switching device N1 in switch control module 2 is in the off state at this time, the output of AC working module 3 will not affect the input power module 1. Among them, diode D2 is used to protect switching device N2, and inductor L1 is used for energy storage and filtering to ensure the stability of AC output.

[0036] Example 2

[0037] like Figure 3 As shown, based on Embodiment 1, a diode D1 is provided between the AC working module 3 and the input power module 1. The negative terminal of the diode D1 is connected to the AC working module 3 and the MCU control module 4, and the positive terminal of the diode D1 is connected to the first output terminal of the input power module 1.

[0038] When the input power module 1 outputs, it charges capacitor C2 through diode D1, at which time the switching device N2 is in the off state. When the MCU control module 4 detects that the voltage of capacitor C2 has reached the set value, the MCU control module 4 sends a working signal to the switching device N2 in the AC working module 3. Capacitor C2 forms a circuit with the switching device N2 through inductor L1. Capacitor C2 discharges through inductor L1, and inductor L1 begins to store energy. When the capacitance of this circuit is discharged to 0, the energy stored in inductor L1 reaches its maximum, the switching device N2 is turned off, the voltage on inductor L1 is reversed, and inductor L1 charges capacitor C2 in reverse through D2. Since the switching device N1 in the switching control module 2 is in the off state at this time, the output of the AC working module 3 will not affect the input power module 1.

[0039] In summary, by utilizing the above-mentioned technical solution of this utility model, the present utility model avoids the mutual interference between the working times of the input power module 1 and the AC working module 3 by using the time-sharing operation of the input power module 1 and the AC working module 3, and by connecting and disconnecting the two circuits through the switching device N1 in the switch control module 2. This results in low circuit cost and high economic benefits. At the same time, the resistor R1 and capacitor C1 in the switch control module 2 form a parallel circuit, which, together with the switching device N1, achieves precise control over the connection between the input power module 1 and the AC working module 3. This innovative control method not only simplifies the circuit structure but also improves the reliability and stability of the control circuit system. The switching control circuit of this invention achieves precise control and real-time monitoring of the system's operating status through the MCU control module 4, effectively preventing backflow and protecting the safety of circuit components. The coordinated operation of capacitor C2, diode D2, switching device N2, and inductor L1 in the AC operating module 3 ensures stable operation of the circuit under different operating modes. In particular, the connection method between diode D1 and the input power module further enhances the circuit's anti-backflow capability, enabling the system to maintain good performance even in complex operating environments. This invention avoids the complex parameter adjustment process of traditional impedance matching methods, making circuit design and debugging simpler and more intuitive. The cooperation of switching devices N1 and N2 enables intelligent switching between the input power module 1 and the AC operating module 3, eliminating the need for large series equivalent inductors for impedance matching. Furthermore, the circuit uses standardized electronic components such as resistor R1, capacitors C1 and C2, and inductor L1, which not only reduces production and maintenance costs but also enhances the product's market competitiveness, demonstrating significant application value and promising prospects for promotion.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A switch control circuit for preventing reverse current in AC output, characterized in that, include: An input power module used to provide the output power and energy required during operation; A switch control module used to connect and disconnect the input power module from the AC working module; An AC operating module used to receive signals from the MCU control module and output them. An MCU control module responsible for system detection and control; One end of the input power module is connected to the switch control module, one end of the switch control module is connected to the AC working module, one end of the AC working module is connected to the MCU control module, and the other end of the MCU control module is connected to the input power module.

2. The switch control circuit for preventing backflow in AC output according to claim 1, characterized in that, The switch control module includes a resistor R1, a capacitor C1, and a switch device N1. The first terminal of the switch device N1 is connected to the second output terminal of the input power module, the second terminal of the switch device N1 is connected to the AC working module, and the third terminal of the switch device N1 is connected to one end of the resistor R1.

3. A switch control circuit for preventing backflow in AC output according to claim 2, characterized in that, The resistor R1 and the capacitor C1 form a parallel circuit. One end of the parallel circuit is connected to the third terminal of the switching device N1 and the MCU control module. The other end of the parallel circuit is connected to the second output terminal of the input power module, the first terminal of the switching device N1, and the MCU control module.

4. A switch control circuit for preventing reverse current in AC output according to claim 1, characterized in that, The AC working module is directly connected to the input power module. The AC working module includes a capacitor C2, a diode D2, a switching device N2, and an inductor L1.

5. A switch control circuit for preventing backflow in AC output according to claim 4, characterized in that, One end of capacitor C2 is connected to the first output terminal of the input power module and inductor L1. The other end of C2 is connected to the positive terminal of diode D2, the first terminal of switching device N2 and the switching control module. The second terminal of switching device N2 is connected to the negative terminal of diode D2 and the other end of inductor L1. The third terminal of switching device N2 is connected to the MCU control module.

6. A switch control circuit for preventing reverse current in AC output according to claim 4, characterized in that, A diode D1 is provided between the AC working module and the input power module. The negative terminal of the diode D1 is connected to the AC working module and the MCU control module, and the positive terminal of the diode D1 is connected to the first output terminal of the input power module.

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