Actuator input power supply open-phase detection circuit

Abstract

The utility model provides an open-phase detection circuit for an input power supply of an actuator. The open-phase detection circuit comprises a three-phase rectification module, a voltage reduction module, an open-phase detection module and a result output module, the input end of the three-phase rectification module is electrically connected with the output end of a three-phase input power supply, and the output end of the three-phase rectification module is electrically connected with the voltage reduction module; the step-down module comprises a step-down element electrically connected with the output end of the three-phase rectifier module, a voltage stabilizing diode electrically connected with the step-down element, and a clamping diode group electrically connected with the voltage stabilizing diode, and the clamping diode group is electrically connected with the input end of the three-phase input power supply; the open-phase detection module is connected between the voltage stabilizing diode and the clamping diode group, and is electrically connected with the result output module; the open-phase detection module comprises an optical coupler; and the result output module is used for outputting an open-phase detection result. According to the open-phase detection circuit for the input power supply of the actuator, the number of electronic devices is reduced, so that the circuit topology is simpler and clearer.

Description

Technical Field

[0001] This utility model relates to the field of power supply phase loss detection technology, specifically to an actuator input power supply phase loss detection circuit. Background Technology

[0002] Three-phase input power is a common form of actuator input power supply. It is a common power supply method in industrial environments and large actuator applications. It consists of three AC potentials with the same frequency, similar amplitude, and phases that differ by 120 electrical degrees. It has the advantages of high efficiency, stability, and high power, and is particularly suitable for equipment that requires high power drive, such as motors and compressors.

[0003] However, when one phase of the three-phase input power supply fails or disconnects, it leads to an imbalance in voltage and current, causing abnormal vibration, overheating, or even damage to equipment such as motors. This affects the stability of the entire power supply system and can even pose safety hazards. Therefore, in industrial applications, it is necessary to regularly perform three-phase input power supply phase loss detection to ensure the normal operation of equipment and the power supply system.

[0004] A common design for existing three-phase input power supply phase loss detection circuits involves first stepping down the three-phase input power supply, then rectifying it, and finally using an optocoupler to detect the rectified circuit waveform to determine if a phase loss exists. This type of three-phase input power supply phase loss detection circuit has the following drawbacks:

[0005] (1) The large number of electronic components required makes circuit construction and maintenance complex. Each electronic component may become a potential point of failure, increasing the risk of circuit failure.

[0006] (2) Due to the large number of electronic components required, the circuit topology is more complicated, which not only increases the difficulty of assembly and debugging, but may also affect the performance and stability of the circuit.

[0007] (3) Furthermore, because a large number of electronic components are required, the circuit board space is large, which limits the flexibility and adaptability of the circuit in different application scenarios.

[0008] Therefore, this solution proposes an actuator input power supply phase loss detection circuit that requires fewer electronic components to solve the above-mentioned technical problems. Utility Model Content

[0009] The purpose of this invention is to provide an actuator input power phase loss detection circuit, which reduces the number of electronic components and makes the circuit topology simpler and clearer.

[0010] To achieve the above objectives, this utility model proposes an actuator input power supply phase loss detection circuit, which includes a three-phase rectifier module, a step-down module, a phase loss detection module, and a result output module.

[0011] The input terminal of the three-phase rectifier module is electrically connected to the output terminal of the three-phase input power supply, and the output terminal of the three-phase rectifier module is electrically connected to the step-down module.

[0012] The step-down module includes a step-down element electrically connected to the output terminal of the three-phase rectifier module, a Zener diode electrically connected to the step-down element, and a clamping diode group electrically connected to the Zener diode. The clamping diode group is electrically connected to the input terminal of the three-phase input power supply.

[0013] The phase loss detection module is connected between the Zener diode and the clamping diode group, and is electrically connected to the result output module;

[0014] The phase loss detection module includes an optical coupler;

[0015] The result output module is used to output the phase loss detection result corresponding to the level signal of the level detection terminal.

[0016] Furthermore, the diode anode of the optocoupler is electrically connected to the Zener diode, and the diode cathode of the optocoupler is electrically connected to the clamping diode group;

[0017] The collector of the transistor in the optocoupler is electrically connected to the operating voltage and the level detection terminal of the result output module, respectively, and the emitter of the transistor in the optocoupler is grounded.

[0018] Furthermore, the clamping diode group includes a first clamping diode whose cathode is electrically connected to the three-phase R terminal, a second clamping diode whose cathode is electrically connected to the three-phase S terminal, and a third clamping diode whose cathode is electrically connected to the three-phase T terminal. The anodes of the first clamping diode, the second clamping diode, and the third clamping diode are respectively electrically connected to the diodes of the optocoupler.

[0019] Furthermore, the step-down element includes a step-down resistor connected between the three-phase rectifier module and the Zener diode.

[0020] Furthermore, the transistor collector of the optocoupler is connected to the operating voltage via a first resistor.

[0021] Furthermore, a capacitor is electrically connected between the collector and emitter of the transistor in the optocoupler.

[0022] Furthermore, a second resistor is electrically connected between the Zener diode and the clamping diode group, and is connected in parallel with the diode of the optocoupler.

[0023] The beneficial effects of this utility model are as follows:

[0024] (1) This scheme uses rectification followed by voltage reduction for phase loss detection. Compared with existing detection circuits, this scheme does not require connecting a voltage reduction resistor on each phase line, reducing the number of voltage reduction resistors, thereby reducing the number of electronic components required, reducing circuit complexity and cost, saving space on the circuit board, and making the circuit more compact and efficient.

[0025] (2) Connecting electronic devices in the manner described in this scheme results in a simple circuit topology, reduces the number of electronic devices used, simplifies the connection between electronic devices, makes the circuit topology more concise and clear, and improves the reliability and stability of the circuit. Attached Figure Description

[0026] Figure 1 This is the circuit schematic diagram of this utility model.

[0027] Figure 2 This is a schematic diagram of a phase loss detection circuit for the input power supply of an actuator, based on existing technology.

[0028] In the attached diagram, the following labels are used: Z2, Zener diode; PC5, optocoupler; PL, level detection terminal; VCC, operating voltage; D9, first clamping diode; D 10 Second clamping diode; D 11 Third clamping diode; R 26 1. Resistor; C9; Capacitor; R 30 11. Second resistor; 12. Three-phase rectifier module; 13. Step-down module; 14. Phase loss detection module; 15. Result output module. Detailed Implementation

[0029] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0030] like Figures 1 to 2 As shown, an actuator input power supply phase loss detection circuit includes a three-phase rectifier module 11, a step-down module 12, a phase loss detection module 13, and a result output module 14.

[0031] The input terminal of the three-phase rectifier module 11 is electrically connected to the output terminal of the three-phase input power supply, and the output terminal of the three-phase rectifier module 11 is electrically connected to the step-down module 12.

[0032] Preferably, the three-phase rectifier module 11 is used to convert three-phase alternating current into direct current, providing a relatively stable direct current for subsequent circuits.

[0033] Optionally, the three-phase rectifier module 11 in this solution can adopt the first set of rectifier bridge arms, the second set of rectifier bridge arms and the third set of rectifier bridge arms of the three-phase rectifier unit disclosed in the utility model patent application number 202222762417.4.

[0034] The step-down module 12 includes a step-down element electrically connected to the output terminal of the three-phase rectifier module 11, a Zener diode Z2 electrically connected to the step-down element, and a clamping diode group electrically connected to the Zener diode Z2. The clamping diode group is electrically connected to the input terminal of the three-phase input power supply.

[0035] The phase loss detection module 13 is connected between the Zener diode Z2 and the clamping diode group, and is electrically connected to the result output module 14;

[0036] Phase loss detection module 13 includes an optocoupler PC5;

[0037] Preferably, the step-down element is electrically connected between the three-phase rectifier module 11 and the Zener diode Z2 to step down the DC power output from the three-phase rectifier module 11 in order to protect the circuit and electronic components.

[0038] Preferably, the Zener diode Z2 is used to provide a stable voltage to ensure the stable anode voltage of the optocoupler PC5 during normal operation of the three-phase input power supply;

[0039] Preferably, when the three-phase input power supply is working normally, the clamping diode group is turned on, providing a stable voltage to the optocoupler PC5.

[0040] The result output module 14 is used to output the phase loss detection result corresponding to the level signal of the level detection terminal PL.

[0041] Furthermore, the diode anode of optocoupler PC5 is electrically connected to Zener diode Z2, and the diode cathode of optocoupler PC5 is electrically connected to clamping diode group;

[0042] The collector of the transistor in optocoupler PC5 is electrically connected to the working voltage VCC and the level detection terminal PL of the result output module (14), respectively, and the emitter of the transistor in optocoupler PC5 is grounded.

[0043] Preferably, when the anode voltage of the diode in optocoupler PC5 is high enough, the diode in optocoupler PC5 conducts and emits light, and the transistor in optocoupler PC5 conducts, and the level detection terminal PL outputs a low level; when the anode voltage of the diode in optocoupler PC5 is insufficient or there is no voltage, the diode in optocoupler PC5 does not conduct and does not emit light, and the transistor in optocoupler PC5 does not conduct, and the level detection terminal PL outputs a high level.

[0044] Preferably, the result output module 14 outputs the detection result of whether the three-phase input power supply is missing a phase based on the level signal of the level detection terminal PL.

[0045] Preferably, the structure of the result output module 14 in this embodiment includes: a CPU connected to the level detection terminal PL, the CPU outputs the detection result of whether the three-phase input power supply is missing a phase according to the level signal of the level detection terminal PL, and if the three-phase input power supply is missing a phase, the corresponding protection or alarm mechanism is triggered.

[0046] Optionally, the result output module 14 in this solution can adopt the result output unit in the utility model patent disclosed in application number 202222762417.4, or it can be implemented in other ways, as long as the function of the result output module 14 in this solution can be achieved.

[0047] Furthermore, the clamping diode group includes a first clamping diode D9 whose cathode is electrically connected to the three-phase R terminal, and a second clamping diode D1 whose cathode is electrically connected to the three-phase S terminal. 10 The third clamping diode D, whose cathode is electrically connected to the three-phase T-terminal, 11 The anode of the first clamping diode D9, the second clamping diode D 10 anode, third clamping diode D 11 The anodes are electrically connected to the diodes of the optocoupler PC5.

[0048] Furthermore, the step-down component includes a step-down resistor connected between the three-phase rectifier module 11 and the Zener diode Z2.

[0049] Preferably, the step-down element includes a step-down resistor R connected in series. 27 Step-down resistor R 28 Step-down resistor R 29 .

[0050] Furthermore, the collector of the transistor in optocoupler PC5 is connected via the first resistor R 26 Connect to the operating voltage VCC.

[0051] Preferably, the first resistor R 26 Used to limit the current flowing through the transistor in optocoupler PC5.

[0052] Furthermore, a capacitor C9 is electrically connected between the collector and emitter of the transistor in optocoupler PC5.

[0053] Furthermore, a second resistor R is electrically connected between the Zener diode Z2 and the clamping diode group. 30 It is connected in parallel with the diode of optocoupler PC5.

[0054] Preferably, the second resistor R 30 This is used to raise the diode on-current threshold of optocoupler PC5.

[0055] The specific working process of this utility model:

[0056] When the three-phase input power supply is operating normally without any phase loss, the first clamping diode D9 and the second clamping diode D... 10 Third clamping diode D 11 When all three phases are conducting and in operation, the anode voltage of the diode in optocoupler PC5 is stable, and the diode in optocoupler PC5 is always conducting. Therefore, the transistor in optocoupler PC5 is always conducting, and the level detection terminal PL always outputs a low level. As a result, the output module 14 outputs the detection result that the three-phase input power supply is normal.

[0057] When the R phase of the three-phase input power supply is missing, the first clamping diode D9 is not conducting; when the S phase of the three-phase input power supply is missing, the second clamping diode D9 is not conducting. 10 Not conducting; when phase T of the three-phase input power supply is missing, the third clamping diode D... 11 It is not conductive.

[0058] When any one of the R-phase, S-phase, or T-phase of the three-phase input power supply is missing, the anode voltage of the diode in optocoupler PC5 becomes unstable, and the diode in optocoupler PC5 alternates between conducting and not conducting. Consequently, the transistor in optocoupler PC5 alternates between conducting and not conducting, and the level detection terminal PL outputs a low level and a high level alternately. That is, the level detection terminal PL outputs a square wave signal, and the result output module 14 outputs the detection result of the three-phase input power supply phase loss and triggers the corresponding protection or alarm mechanism.

[0059] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A phase loss detection circuit for actuator input power supply, characterized in that, It includes a three-phase rectifier module (11), a step-down module (12), a phase loss detection module (13), and a result output module (14); The input terminal of the three-phase rectifier module (11) is electrically connected to the output terminal of the three-phase input power supply, and the output terminal of the three-phase rectifier module (11) is electrically connected to the step-down module (12). The step-down module (12) includes a step-down element electrically connected to the output terminal of the three-phase rectifier module (11), a Zener diode Z2 electrically connected to the step-down element, and a clamping diode group electrically connected to the Zener diode Z2. The clamping diode group is electrically connected to the input terminal of the three-phase input power supply. The phase loss detection module (13) is connected between the Zener diode Z2 and the clamping diode group, and is electrically connected to the result output module (14); The phase loss detection module (13) includes an optical coupler PC5; The result output module (14) is used to output the phase loss detection result corresponding to the level signal of the level detection terminal PL.

2. The actuator input power supply phase loss detection circuit according to claim 1, characterized in that, The diode anode of the optocoupler PC5 is electrically connected to the Zener diode Z2, and the diode cathode of the optocoupler PC5 is electrically connected to the clamping diode group. The collector of the transistor in the optocoupler PC5 is electrically connected to the operating voltage VCC and the level detection terminal PL of the result output module (14), respectively, and the emitter of the transistor in the optocoupler PC5 is grounded.

3. The actuator input power supply phase loss detection circuit according to claim 1, characterized in that, The clamping diode group includes a first clamping diode D9 whose cathode is electrically connected to the three-phase R terminal, and a second clamping diode D1 whose cathode is electrically connected to the three-phase S terminal. 10 The third clamping diode D, whose cathode is electrically connected to the three-phase T-terminal, 11 The anode of the first clamping diode D9, the second clamping diode D 10 The anode, the third clamping diode D 11 The anodes are electrically connected to the diodes of the optocoupler PC5.

4. The actuator input power supply phase loss detection circuit according to claim 1, characterized in that, The step-down element includes a step-down resistor connected between the three-phase rectifier module (11) and the Zener diode Z2.

5. The actuator input power supply phase loss detection circuit according to claim 1, characterized in that, The collector of the transistor in the optocoupler PC5 is connected to the first resistor R. 26 Connect to the operating voltage VCC.

6. The actuator input power supply phase loss detection circuit according to claim 1, characterized in that, A capacitor C9 is electrically connected between the collector and emitter of the transistor in the optocoupler PC5.

7. The actuator input power supply phase loss detection circuit according to claim 1, characterized in that, A second resistor R is electrically connected between the Zener diode Z2 and the clamping diode group. 30 It is connected in parallel with the diode of the optocoupler PC5.

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