Dual-power automatic change-over switch controller

Abstract

The utility model discloses a dual-power automatic change-over switch controller, which comprises a main control chip, a standing null line switching module, a frequently-used power supply acquisition module, a standby power supply acquisition module, an output module, a storage module and a user interface, the frequently-used power supply acquisition module comprises a first resistance voltage-dividing sampling circuit, the standby power supply acquisition module comprises a second resistance voltage-dividing sampling circuit, the standing zero line switching module comprises a first switching circuit and a second switching circuit, and the first resistance voltage-dividing sampling circuit is connected to the first switching circuit. The second resistance voltage division sampling circuit is connected to the second switching circuit, and the first switching circuit and the second switching circuit are connected to the main control chip. According to the dual-power-supply automatic change-over switch controller, zero line switching is carried out on the interior of the controller through the standing zero line switching module, and the problem that virtual voltage values are displayed on a display due to a common zero line of the controller can be effectively solved.

Description

Technical Field

[0001] This utility model specifically relates to a dual-power automatic transfer switch controller. Background Technology

[0002] Currently, voltage signal acquisition in dual-power automatic transfer switch controllers mainly includes sampling methods such as voltage transformers, transformers, resistive voltage dividers, and linear optocouplers. Transformer sampling offers relatively simple circuitry and high reliability and stability, but it is large and costly. Voltage transformer sampling offers high accuracy, relatively small size, high cost, and strong anti-interference capabilities. Furthermore, voltage transformers can isolate high and low voltages, ensuring safety during the acquisition process. Linear optocouplers have a narrow operating range, are prone to operating in nonlinear conditions, and have high design costs. Resistive voltage divider sampling converts a portion of the current or voltage in the circuit into a measurable signal, thereby achieving accurate measurement of circuit parameters.

[0003] However, in dual-power automatic transfer switches, each power supply is independent and does not interfere with the others. But if the controller uses a resistor-divided sampling mode, it typically uses a common neutral wire mode internally, which can lead to interference between the power supplies. This can cause virtual voltages to appear on the display, resulting in incorrect controller judgments and issuing incorrect commands. This type of failure is particularly prone to occur during factory testing and calibration of dual-power automatic transfer switches because the two power supplies on the manufacturer's calibration bench are not completely physically isolated. Utility Model Content

[0004] This utility model provides a dual-power automatic transfer switch controller to solve the aforementioned technical problems, specifically adopting the following technical solution:

[0005] A dual-power automatic transfer switch controller includes: a main control chip, a normal and standby neutral line switching module, a normal power acquisition module, a standby power acquisition module, an output module, a storage module, and a user interface;

[0006] The common power acquisition module and the backup power acquisition module are connected to the common and backup neutral line switching module;

[0007] The standby neutral wire switching module, the output module, the storage module, and the user interface are connected to the main control chip;

[0008] The common power acquisition module includes a first resistor voltage divider sampling circuit and the backup power acquisition module includes a second resistor voltage divider sampling circuit. The common and backup neutral line switching module includes a first switching circuit and a second switching circuit. The first resistor voltage divider sampling circuit is connected to the first switching circuit, and the second resistor voltage divider sampling circuit is connected to the second switching circuit. The first switching circuit and the second switching circuit are connected to the main control chip.

[0009] Furthermore, the first switching circuit includes resistor R336, optocoupler U302, resistor R351, resistor R339 and resistor R338;

[0010] The first port of the optocoupler U302 is connected to VCC through the resistor R336, the second port of the optocoupler U302 is connected to the control port NN_NO of the main control chip, the third port of the optocoupler U302 is connected to the VF_N port of the main control chip, and the fourth port of the optocoupler U302 is connected to the neutral line of the normal power supply through the resistors R351, R339 and R338 in sequence.

[0011] The second switching circuit includes resistor R337, optocoupler U303, resistor R352, resistor R341 and resistor R340;

[0012] The first port of the optocoupler U303 is connected to VCC through the resistor R337, the second port of the optocoupler U303 is connected to the control port RN_NO of the main control chip, the third port of the optocoupler U303 is connected to the VF_R port of the main control chip, and the fourth port of the optocoupler U302 is connected to the neutral line of the backup power supply in sequence through the resistors R352, R341 and R340.

[0013] Furthermore, the first resistor voltage divider sampling circuit includes resistors R329, R330, R331, and R335. Resistors R329, R330, R331, and R335 are connected in sequence. The other end of resistor R329 is connected to the live wire of the common power supply, and the other end of resistor R335 is connected to the VF_N port of the main control chip. The midpoint between resistors R331 and R335 is connected to the ADC detection port one of the main control chip.

[0014] The second resistor voltage divider sampling circuit includes resistors R429, R430, R431, and R435. Resistors R429, R430, R431, and R435 are connected in sequence. The other end of resistor R429 is connected to the live wire of the backup power supply, and the other end of resistor R435 is connected to the VF_R port of the main control chip. The midpoint between resistors R431 and R435 is connected to the second ADC detection port of the main control chip.

[0015] Furthermore, the first resistor voltage divider sampling circuit includes resistors R329, R330, R331, R335, voltage follower U300D, resistor R325, and capacitor C313;

[0016] Resistors R329, R330, R331, and R335 are connected in sequence. The other end of resistor R329 is connected to the live wire of the power supply. The other end of resistor R335 is connected to the VF_N port of the main control chip. The midpoint of resistors R331 and R335 is connected to the non-inverting input of voltage follower U300D. The inverting input and output of voltage follower U300D are connected. The output of voltage follower U300D is grounded through resistor R325 and capacitor C313 in sequence. The midpoint of resistor R325 and capacitor C313 is connected to the ADC detection port one of the main control chip.

[0017] The second resistor voltage divider sampling circuit includes resistors R429, R430, R431, R435, voltage follower U300B, resistor R425, and capacitor C413.

[0018] Resistors R429, R430, R431, and R435 are connected in sequence. The other end of resistor R429 is connected to the live wire of the backup power supply, and the other end of resistor R435 is connected to the VF_R port of the main control chip. The midpoint of resistors R431 and R435 is connected to the non-inverting input terminal of voltage follower U300B. The inverting input terminal and output terminal of voltage follower U300B are connected. The output terminal of voltage follower U300B is grounded through resistor R425 and capacitor C413 in sequence. The midpoint of resistor R425 and capacitor C413 is connected to the second ADC detection port of the main control chip.

[0019] Furthermore, the user interface includes a button module and a display module.

[0020] Furthermore, the display module is a liquid crystal display screen.

[0021] Furthermore, the display module is a touch screen display.

[0022] Furthermore, the storage module is an EEPROM.

[0023] Furthermore, the dual-power automatic transfer switch controller includes a housing;

[0024] The main control chip, the standby neutral wire switching module, the common power acquisition module, the standby power acquisition module, the output module, and the storage module are disposed inside the housing, and the user interface is disposed on the housing.

[0025] The advantage of this utility model is that the provided dual-power automatic transfer switch controller can switch the neutral line inside the controller through the standby neutral line switching module, which can effectively solve the problem of the virtual voltage value displayed on the display caused by the common neutral line.

[0026] The advantage of this invention lies in the provision of a dual-power automatic transfer switch controller. The resistor-divider sampling circuit uses a thyristor as the internal neutral switching circuit. The thyristor control circuit is simple, offers high control precision, and has a fast response speed, completing the on / off operation within microseconds, making it suitable for high-speed operating environments. Furthermore, the thyristor is a solid-state device with high reliability and a long lifespan, making it suitable for use in various harsh environments. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a dual-power automatic transfer switch controller according to this utility model;

[0029] Figure 2 This is a schematic diagram of the first switching circuit of this utility model;

[0030] Figure 3 This is a schematic diagram of the second switching circuit of this utility model;

[0031] Figure 4 This is a schematic diagram of the first resistor voltage divider sampling circuit of this utility model;

[0032] Figure 5 This is a schematic diagram of the second resistor voltage divider sampling circuit of this utility model;

[0033] Figure 6This is a schematic diagram of another embodiment of the first resistor voltage divider sampling circuit of this utility model;

[0034] Figure 7 This is a schematic diagram of another embodiment of the second resistor voltage divider sampling circuit of this utility model. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0036] like Figure 1 The diagram shows a dual-power automatic transfer switch controller according to this application, comprising: a main control chip, a normal and standby neutral line switching module, a normal power acquisition module, a standby power acquisition module, an output module, a storage module, and a user interface.

[0037] The primary power acquisition module and the backup power acquisition module are connected to the primary / backup neutral line switching module. The primary / backup neutral line switching module, the output module, the storage module, and the user interface are connected to the main control chip.

[0038] Specifically, the user interface includes a button module and a display module for user operation. In the embodiments of this application, the display module is a liquid crystal display screen. Optionally, the display module can also be a touch screen.

[0039] In the embodiments of this application, the storage module is an electrically erasable programmable read-only memory (EEPROM).

[0040] The common power acquisition module includes a first resistor voltage divider sampling circuit, and the backup power acquisition module includes a second resistor voltage divider sampling circuit. The common and backup neutral line switching module includes a first switching circuit and a second switching circuit. The first resistor voltage divider sampling circuit is connected to the first switching circuit, the second resistor voltage divider sampling circuit is connected to the second switching circuit, and the first switching circuit and the second switching circuit are connected to the main control chip.

[0041] like Figure 2 and 3As shown, the first switching circuit includes resistor R336, optocoupler U302, resistor R351, resistor R339, and resistor R338. The second switching circuit includes resistor R337, optocoupler U303, resistor R352, resistor R341, and resistor R340. Specifically, the first port of optocoupler U302 is connected to VCC via resistor R336, the second port of optocoupler U302 is connected to the control port NN_NO of the main control chip, the third port of optocoupler U302 is connected to the VF_N port of the main control chip, and the fourth port of optocoupler U302 is connected to the neutral line of the main power supply via resistors R351, R339, and R338. The first port of optocoupler U303 is connected to VCC through resistor R337. The second port of optocoupler U303 is connected to the control port RN_NO of the main control chip. The third port of optocoupler U303 is connected to the VF_R port of the main control chip. The fourth port of optocoupler U302 is connected to the neutral line of the backup power supply through resistors R352, R341 and R340 in sequence.

[0042] like Figure 4 and 5 As shown, in the embodiments of this application, the first resistor voltage divider sampling circuit includes resistors R329, R330, R331, and R335. The second resistor voltage divider sampling circuit includes resistors R429, R430, R431, and R435. Specifically, resistors R329, R330, R331, and R335 are connected sequentially. The other end of resistor R329 is connected to the live wire of the main power supply, and the other end of resistor R335 is connected to the VF_N port of the main control chip. The midpoint between resistors R331 and R335 is connected to the first ADC detection port of the main control chip. Resistors R429, R430, R431, and R435 are connected sequentially. The other end of resistor R429 is connected to the live wire of the backup power supply, and the other end of resistor R435 is connected to the VF_R port of the main control chip. The midpoint between resistors R431 and R435 is connected to the second ADC detection port of the main control chip.

[0043] In the proposed implementation, the microcontroller controls the thyristor via I / O ports as the internal neutral switching circuit of the controller, thereby eliminating the virtual voltage displayed by the dual-power automatic transfer switch controller. Specifically, the main control chip outputs a low-level signal to U302, at which point U302 is turned on. The voltage signal of the primary power supply forms a loop through U302, R335, R329, R330, R331, R338, R339, and R351, and is transmitted to the internal ADC module of the main control chip for analog-to-digital conversion. The backup power supply works similarly. The selection of the primary / backup neutral line is achieved by a timer within the main control chip that cycles every 20ms. Every 20ms, the main control chip's I / O controls the on / off switching of U302 and U303 for periodic switching.

[0044] like Figure 6 and 7 As shown, in another optional implementation, the first resistor divider sampling circuit includes resistors R329, R330, R331, R335, voltage follower U300D, resistor R325, and capacitor C313. The second resistor divider sampling circuit includes resistors R429, R430, R431, R435, voltage follower U300B, resistor R425, and capacitor C413. Among them, resistors R329, R330, R331, and R335 are connected in sequence. The other end of resistor R329 is connected to the live wire of the power supply, and the other end of resistor R335 is connected to the VF_N port of the main control chip. The midpoint of resistors R331 and R335 is connected to the non-inverting input of voltage follower U300D. The inverting input and output of voltage follower U300D are connected. The output of voltage follower U300D is grounded through resistor R325 and capacitor C313 in sequence. The midpoint of resistor R325 and capacitor C313 is connected to the ADC detection port one of the main control chip. Resistors R429, R430, R431, and R435 are connected sequentially. One end of resistor R429 is connected to the live wire of the backup power supply, and the other end of resistor R435 is connected to the VF_R port of the main control chip. The midpoint between resistors R431 and R435 is connected to the non-inverting input of voltage follower U300B. The inverting input and output of voltage follower U300B are connected. The output of voltage follower U300B is grounded sequentially through resistor R425 and capacitor C413. The midpoint between resistor R425 and capacitor C413 is connected to the second ADC detection port of the main control chip. Compared to the previously described implementation, this implementation improves the driving capability through the use of a voltage follower.

[0045] As an optional implementation, the dual-power automatic transfer switch controller includes a housing. The main control chip, the normal / standby neutral wire switching module, the normal power acquisition module, the standby power acquisition module, the output module, and the storage module are housed within the housing. The user interface is located on the housing for user operation.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A dual-power automatic transfer switch controller, characterized in that, Includes: main control chip, standby neutral wire switching module, common power acquisition module, standby power acquisition module, output module, storage module and user interface; The common power acquisition module and the backup power acquisition module are connected to the common and backup neutral line switching module; The standby neutral wire switching module, the output module, the storage module, and the user interface are connected to the main control chip; The common power acquisition module includes a first resistor voltage divider sampling circuit and the backup power acquisition module includes a second resistor voltage divider sampling circuit. The common and backup neutral line switching module includes a first switching circuit and a second switching circuit. The first resistor voltage divider sampling circuit is connected to the first switching circuit, and the second resistor voltage divider sampling circuit is connected to the second switching circuit. The first switching circuit and the second switching circuit are connected to the main control chip.

2. The dual-power automatic transfer switch controller according to claim 1, characterized in that, The first switching circuit includes resistor R336, optocoupler U302, resistor R351, resistor R339 and resistor R338; The first port of the optocoupler U302 is connected to VCC through the resistor R336, the second port of the optocoupler U302 is connected to the control port NN_NO of the main control chip, the third port of the optocoupler U302 is connected to the VF_N port of the main control chip, and the fourth port of the optocoupler U302 is connected to the neutral line of the normal power supply through the resistors R351, R339 and R338 in sequence. The second switching circuit includes resistor R337, optocoupler U303, resistor R352, resistor R341 and resistor R340; The first port of the optocoupler U303 is connected to VCC through the resistor R337, the second port of the optocoupler U303 is connected to the control port RN_NO of the main control chip, the third port of the optocoupler U303 is connected to the VF_R port of the main control chip, and the fourth port of the optocoupler U302 is connected to the neutral line of the backup power supply in sequence through the resistors R352, R341 and R340.

3. The dual-power automatic transfer switch controller according to claim 2, characterized in that, The first resistor voltage divider sampling circuit includes resistors R329, R330, R331, and R335. Resistors R329, R330, R331, and R335 are connected in sequence. The other end of resistor R329 is connected to the live wire of the power supply, and the other end of resistor R335 is connected to the VF_N port of the main control chip. The midpoint between resistors R331 and R335 is connected to the ADC detection port one of the main control chip. The second resistor voltage divider sampling circuit includes resistors R429, R430, R431, and R435. Resistors R429, R430, R431, and R435 are connected in sequence. The other end of resistor R429 is connected to the live wire of the backup power supply, and the other end of resistor R435 is connected to the VF_R port of the main control chip. The midpoint between resistors R431 and R435 is connected to the second ADC detection port of the main control chip.

4. The dual-power automatic transfer switch controller according to claim 2, characterized in that, The first resistor voltage divider sampling circuit includes resistors R329, R330, R331, R335, voltage follower U300D, resistor R325, and capacitor C313; Resistors R329, R330, R331, and R335 are connected in sequence. The other end of resistor R329 is connected to the live wire of the power supply. The other end of resistor R335 is connected to the VF_N port of the main control chip. The midpoint of resistors R331 and R335 is connected to the non-inverting input of voltage follower U300D. The inverting input and output of voltage follower U300D are connected. The output of voltage follower U300D is grounded through resistor R325 and capacitor C313 in sequence. The midpoint of resistor R325 and capacitor C313 is connected to the ADC detection port one of the main control chip. The second resistor voltage divider sampling circuit includes resistors R429, R430, R431, R435, voltage follower U300B, resistor R425, and capacitor C413. Resistors R429, R430, R431, and R435 are connected in sequence. The other end of resistor R429 is connected to the live wire of the backup power supply, and the other end of resistor R435 is connected to the VF_R port of the main control chip. The midpoint of resistors R431 and R435 is connected to the non-inverting input terminal of voltage follower U300B. The inverting input terminal and output terminal of voltage follower U300B are connected. The output terminal of voltage follower U300B is grounded through resistor R425 and capacitor C413 in sequence. The midpoint of resistor R425 and capacitor C413 is connected to the second ADC detection port of the main control chip.

5. The dual-power automatic transfer switch controller according to claim 1, characterized in that, The user interface includes a button module and a display module.

6. The dual-power automatic transfer switch controller according to claim 5, characterized in that, The display module is a liquid crystal display screen.

7. The dual-power automatic transfer switch controller according to claim 5, characterized in that, The display module is a touch screen.

8. The dual-power automatic transfer switch controller according to claim 1, characterized in that, The storage module is an EEPROM.

9. The dual-power automatic transfer switch controller according to claim 1, characterized in that, The dual-power automatic transfer switch controller includes a housing; The main control chip, the standby neutral wire switching module, the common power acquisition module, the standby power acquisition module, the output module, and the storage module are disposed inside the housing, and the user interface is disposed on the housing.

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