A controller zero line, live line and ground line detection circuit

Abstract

The present invention relates to a controller neutral live wire and ground wire detection circuit, the detection circuit comprises: a voltage input circuit connected to the controller neutral wire terminal and inputting a preset voltage to the controller neutral wire terminal; a first detection circuit connected to the controller ground terminal and detecting an electrical signal of the controller ground terminal; and a second detection circuit respectively connected to the controller live wire terminal and the controller ground terminal and detecting a voltage difference between the controller live wire terminal and the controller ground terminal. The embodiment of the present invention inputs a preset voltage to the controller neutral wire terminal, and confirms whether the controller's neutral live wire is connected correctly and whether the controller's ground terminal is connected to the ground wire according to the electrical signal of the controller ground terminal and the voltage difference between the controller live wire terminal and the controller ground terminal, thereby realizing rapid confirmation of the connection status of each circuit of the controller according to different results output by the detection circuit, and improving the safety of maintenance by the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of controller circuits, and in particular to a controller neutral line, live line and ground line detection circuit. Background Art

[0002] A controller (English name: controller) is a main command device that changes the wiring of the main circuit or control circuit and the resistance value in the circuit in a predetermined order to control the start, speed regulation, braking and reversal of the motor. It is composed of a program counter, an instruction register, an instruction decoder, a timing generator and an operation controller. It is the "decision-making body" that issues commands, that is, it coordinates and directs the operation of the entire computer system.

[0003] Generally, most controller motherboards use AC input power. If there is no anti-reverse plug-in design, there may be a problem of reverse connection of the neutral and live wires, causing damage to the controller. At the same time, if there is no ground wire from the motherboard to the entire machine, it may cause electric shock to the staff during maintenance or use. Summary of the invention

[0004] In order to solve the problems existing in the prior art, at least one embodiment of the present invention provides a controller neutral line, live line and ground line detection circuit.

[0005] In a first aspect, an embodiment of the present invention provides a controller neutral line, live line and ground line detection circuit, including:

[0006] A voltage input circuit connected to the neutral terminal of the controller and inputting a preset voltage to the neutral terminal of the controller;

[0007] A first detection circuit connected to a ground terminal of the controller and used to detect an electrical signal at the ground terminal of the controller;

[0008] A second detection circuit is respectively connected to the live wire terminal of the controller and the ground terminal of the controller and is used to detect the voltage difference between the live wire terminal of the controller and the ground terminal of the controller.

[0009] Based on the above technical solution, the embodiment of the present invention can also make the following improvements.

[0010] In combination with the first aspect, in a first embodiment of the first aspect, the voltage input terminal circuit includes:

[0011] A voltage input terminal for inputting voltage;

[0012] The input end is connected to the voltage input end, the output end is connected to the neutral line end of the controller, and the voltage input from the voltage input end is converted into a preset voltage by a voltage stabilizing device.

[0013] In combination with the first embodiment of the first aspect, in a second embodiment of the first aspect, the voltage input terminal includes: a voltage terminal and a first capacitor;

[0014] One end of the first capacitor is connected to the voltage end and the input end of the voltage stabilizing device respectively;

[0015] The other end of the first capacitor is grounded;

[0016] The output end of the voltage stabilizing device includes: a positive output end and a negative output end;

[0017] The positive output terminal is connected to the zero line terminal of the controller and one end of the second capacitor respectively;

[0018] The other end of the second capacitor and the negative output end are both grounded.

[0019] In combination with the second embodiment of the first aspect, in a third embodiment of the first aspect, a current limiting circuit is further provided between the voltage terminal and the input terminal of the voltage stabilizing device.

[0020] In combination with the first aspect, in a fourth embodiment of the first aspect, the first detection circuit includes: a first resistor, a second resistor and a voltage detection circuit;

[0021] The controller ground terminal, the first resistor and the second resistor are connected in series in sequence, and the second resistor is grounded;

[0022] The voltage detection circuit is connected in parallel with the second resistor and detects the voltage across the second resistor.

[0023] In combination with the fourth embodiment of the first aspect, in a fifth embodiment of the first aspect, the voltage detection circuit includes: a first voltage detection terminal and a third capacitor;

[0024] One end of the third capacitor is connected to the ground end of the second resistor;

[0025] The other end of the third capacitor is connected to the first voltage detection end and the other end of the second resistor respectively.

[0026] In combination with the fifth embodiment of the first aspect, in a sixth embodiment of the first aspect, a diode is further provided on the connection line between the second resistor and the first voltage detection end;

[0027] The conducting direction of the diode is from the second resistor to the first voltage detection end.

[0028] In combination with the sixth embodiment of the first aspect, in a seventh embodiment of the first aspect, a current limiting circuit and a clamping circuit are further provided on the connection line between the second resistor and the first voltage detection terminal.

[0029] In combination with the first aspect or any one of the first, second, third, fourth, fifth, sixth or seventh embodiments of the first aspect, in an eighth embodiment of the first aspect, the second detection circuit includes: a third resistor, a fourth resistor, an optical coupler and a conduction detection circuit;

[0030] The live wire end of the controller, the third resistor, the fourth resistor and the ground end of the controller are connected in sequence;

[0031] The light emitter of the optical coupler is connected in parallel with the fourth resistor; the conducting direction of the light emitter is from the live wire end of the controller to the ground end of the controller;

[0032] The conduction detection circuit is connected in parallel with the light receiver of the optical coupler and detects the conduction status of the light receiver.

[0033] In combination with the eighth embodiment of the first aspect, in a ninth embodiment of the first aspect, the conduction detection circuit includes: a second voltage detection terminal, a fourth capacitor, a second current limiting circuit, and a second voltage input terminal that outputs a voltage of a preset voltage value;

[0034] One end of the light receiver is connected to the second voltage detection end and the second voltage input end respectively;

[0035] The other end of the light receiver is grounded;

[0036] One end of the fourth capacitor is connected to the second voltage detection end, and the other end of the fourth capacitor is grounded;

[0037] The second current limiting circuit is arranged on a connection line between the second voltage input terminal and the second voltage detection terminal.

[0038] The above technical scheme of the present invention has the following advantages compared with the prior art: the embodiment of the present invention inputs a preset voltage at the neutral line terminal of the controller, and detects the electrical signal at the ground terminal of the controller and the voltage difference between the live line terminal of the controller and the ground terminal of the controller. According to the electrical signal at the ground terminal of the controller and the voltage difference between the live line terminal of the controller and the ground terminal of the controller, it confirms whether the neutral and live wires of the controller are connected correctly and whether the ground terminal of the controller is connected to the ground wire, thereby realizing rapid confirmation of the connection status of each line of the controller according to different results output by the detection circuit, thereby improving the safety of maintenance by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of a controller neutral line, live line and ground line detection circuit provided by an embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of the structure of a controller neutral line, live line and ground line detection circuit provided by another embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of a controller neutral line, live line and ground line detection circuit structure provided by another embodiment of the present invention;

[0042] Figure 4 This is the second schematic diagram of the structure of a controller neutral, live and ground wire detection circuit provided by another embodiment of the present invention.

[0043] In the figure: 1: voltage terminal; 2: first capacitor; 3: voltage stabilizing device; 4: controller neutral terminal; 5: second capacitor; 6: controller ground terminal; 7: first resistor; 8: second resistor; 9: first voltage detection terminal; 10: third capacitor; 11: clamping circuit; 12: controller live terminal; 13: third resistor; 14: fourth resistor; 15: optical coupler; 16: second voltage detection terminal; 17: fourth capacitor; 18: second current limiting circuit; 19: second voltage input terminal. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1 As shown, a controller neutral line, live line and ground line detection circuit is provided in an embodiment of the present invention.

[0046] In this embodiment, the detection circuit includes: a voltage input circuit connected to the controller neutral terminal 4 and inputting a preset voltage to the controller neutral terminal 4, and inputting a voltage of a preset voltage value, such as a five-volt voltage, to the controller neutral terminal 4 by connecting to the controller neutral terminal 4. In the power supply network, the potential of the neutral terminal is zero. If the potential of the neutral terminal is not zero, the neutral terminal needs to be grounded to avoid voltage on the neutral line, which may cause electric shock to the human body. Therefore, the controller neutral terminal 4 must be grounded and repeatedly grounded to ensure that it is an equipotential body with the earth. Therefore, in the controller, the neutral terminal and the ground terminal of the controller are connected together. By adding a voltage of a preset voltage value to the neutral terminal, the potential of the controller ground terminal 6 is consistent with the neutral terminal.

[0047] like Figure 2As shown, for example, in this embodiment, the voltage input circuit includes: a voltage input terminal for inputting voltage; the input terminal is connected to the voltage input terminal, the output terminal is connected to the neutral line terminal 4 of the controller, and a voltage stabilizing device 3 is used to convert the voltage inputted from the voltage input terminal into a preset voltage. The voltage input terminal can input a voltage of any voltage value, and the voltage is converted into a voltage of a preset voltage value by the voltage stabilizing device 3 and inputted into the neutral line terminal 4 of the controller.

[0048] In this embodiment, the voltage input end includes: a voltage end 1 and a first capacitor 2, one end of the first capacitor 2 is connected to the voltage end 1 and the input end of the voltage stabilizing device 3 respectively; the other end of the first capacitor 2 is grounded, and the potential of the input end of the voltage stabilizing device 3 is consistent with the potential of the voltage end 1 through the first capacitor 2.

[0049] In this embodiment, a current limiting circuit is also arranged between the voltage terminal 1 and the input terminal of the voltage stabilizing device 3. Since the voltage of the voltage terminal 1 can be any voltage value, in this embodiment, a current limiting circuit is arranged between the voltage terminal 1 and the input terminal of the voltage stabilizing device 3 to avoid excessive voltage, which may cause excessive current in the circuit and damage the circuit. The current limiting circuit may be a resistor connected in series in the circuit, or two resistors connected in series in the circuit respectively.

[0050] The output end of the voltage stabilizing device 3 includes: a positive output end and a negative output end; the positive output end is respectively connected to the controller neutral line terminal 4 and one end of the second capacitor 5; the other end of the second capacitor 5 and the negative output end are both grounded, and the output end of the voltage stabilizing device 3 outputs a voltage of a preset voltage value to the controller neutral line terminal 4 through the second capacitor 5.

[0051] In this embodiment, a capacitor may be connected in parallel at both ends of the first capacitor 2 and the second capacitor 5 respectively to prevent the first capacitor 2 or the second capacitor 5 from being damaged, causing erroneous conduction and thus causing failure of the voltage input circuit.

[0052] In this embodiment, the detection circuit also includes: a first detection circuit connected to the controller ground terminal 6 and used to detect the electrical signal of the controller ground terminal 6. The electrical signal of the controller ground terminal 6 is detected by the first detection circuit. When the controller ground terminal 6 is not grounded, the electrical signal detected by the first detection circuit is the potential of the controller neutral terminal 4. At this time, if the first detection circuit detects the electrical signal, it means that the controller ground terminal 6 is not grounded. Whether the controller ground terminal 6 is grounded can be determined by the first detection circuit.

[0053] In this embodiment, the detection circuit also includes: a second detection circuit respectively connected to the controller live wire terminal 12 and the controller ground terminal 6, and used to detect the voltage difference between the controller live wire terminal 12 and the controller ground terminal 6. The voltage difference between the controller live wire terminal 12 and the controller ground terminal 6 is detected by the second detection circuit. If the controller ground terminal 6 is grounded, the voltage difference detected by the second detection circuit is the potential of the controller live wire terminal 12, then the zero and live wires of the controller are connected correctly. If the voltage difference detected by the second detection circuit is zero, then the zero and live wires of the controller are connected reversely.

[0054] like Figure 3 , Figure 4 As shown, the embodiment of the present invention also provides a controller neutral line and ground line detection circuit, and Figure 1 Compared with the detection circuit shown in the figure, the difference is that

[0055] The first detection circuit includes: a first resistor 7, a second resistor 8 and a voltage detection circuit; the controller ground terminal 6, the first resistor 7 and the second resistor 8 are connected in series in sequence, and the second resistor 8 is grounded; the voltage detection circuit is connected in parallel with the second resistor 8, and detects the voltage across the second resistor 8. The first resistor 7 and the second resistor 8 are connected in series between the controller ground terminal 6 and the ground wire, and the voltage value of the second resistor 8 is detected. When the controller ground terminal 6 is connected to the ground wire, there will be no voltage value on the second resistor 8. If there is a voltage value on the second resistor 8, it can be confirmed that the controller ground terminal 6 is not connected to the ground wire.

[0056] In this embodiment, the voltage detection circuit includes: a first voltage detection terminal 9 and a third capacitor 10; one end of the third capacitor 10 is connected to the ground terminal of the second resistor 8; the other end of the third capacitor 10 is respectively connected to the first voltage detection terminal 9 and the other end of the second resistor 8, and the third capacitor 10 makes the potential of the first voltage detection terminal 9 consistent with that of the high potential end of the second resistor 8. Since the other end of the second resistor 8 is grounded, the voltage value across the second resistor 8 is detected.

[0057] In this embodiment, a capacitor may be connected in parallel at both ends of the third capacitor 10 to prevent the third capacitor 10 from being damaged, causing erroneous conduction and resulting in an erroneous electrical signal detected by the first voltage detection terminal 9 .

[0058] In this embodiment, a diode is also provided on the connection line between the second resistor 8 and the first voltage detection terminal 9; the conduction direction of the diode is from the second resistor 8 to the first voltage detection terminal 9. When a forward voltage is applied to the diode, in the initial part of the forward characteristic, the forward voltage is very small, insufficient to overcome the blocking effect of the electric field in the PN junction, and the forward current is almost zero. This section is called the dead zone. This forward voltage that cannot make the diode conduct is called the dead zone voltage. When the forward voltage is greater than the dead zone voltage, the electric field in the PN junction is overcome, the diode is forward-conducted, and the current rises rapidly with the increase of voltage. Within the current range of normal use, the terminal voltage of the diode remains almost unchanged when it is turned on. This voltage is called the forward voltage of the diode. Therefore, by providing a diode between the second resistor 8 and the first voltage detection terminal 9, if the voltage value at both ends of the second resistor 8 is less than the dead zone voltage of the diode, the diode is not conducting at this time, and the voltage value detected by the first voltage detection terminal 9 is zero at this time.

[0059] In this embodiment, a current limiting circuit and a clamping circuit 11 are further provided on the connection line between the second resistor 8 and the first voltage detection terminal 9. In order to avoid excessive current or voltage caused by a short circuit in the line, a current limiting circuit and a clamping circuit 11 are provided in the line to ensure that the current and voltage values ​​in the line are not too large, thereby improving the safety of the line. The current limiting circuit can be a resistor connected in series in the line, or two resistors connected in series in the line respectively.

[0060] In this embodiment, the second detection circuit includes: a third resistor 13, a fourth resistor 14, an optical coupler 15 and a conduction detection circuit; the controller live wire terminal 12, the third resistor 13, the fourth resistor 14 and the controller ground terminal 6 are connected in sequence, the third resistor 13 and the fourth resistor 14 are connected in series between the controller live wire terminal 12 and the controller ground terminal 6, the light emitter of the optical coupler 15 is connected in parallel with the fourth resistor 14, and since the light emitter is connected in parallel with the fourth resistor 14, the light emitter voltage is the voltage across the fourth resistor 14, and the light emitter of the optical coupler 15 will emit light when it is turned on. Moreover, since the light emitter is a light emitting diode, the dead zone voltage of the diode can also be applied in the same way; the conduction direction of the light emitter is that the live wire terminal 12 of the controller points to the ground terminal 6 of the controller; the conduction detection circuit is connected in parallel with the light receiver of the optocoupler 15, and detects the conduction status of the light receiver. When the light emitter is turned on and emits light, the light receiver will turn on when it receives the light emitted by the light emitter. The conduction detection circuit detects whether the light receiver is turned on. At this time, if the light receiver is turned on, it means that the light emitter is turned on. At this time, the voltage between the live wire terminal 12 of the controller and the ground terminal 6 of the controller has reached the limit of the light emitter conduction.

[0061] In this embodiment, the conduction detection circuit includes: a second voltage detection terminal 16, a fourth capacitor 17, a second current limiting circuit 18 and a second voltage input terminal 19 that outputs a voltage of a preset voltage value, and the voltage value of the voltage output by the second voltage input terminal 19 can be 3.3 volts; one end of the photoreceiver is respectively connected to the second voltage detection terminal 16 and the second voltage input terminal 19; the other end of the photoreceiver is grounded; one end of the fourth capacitor 17 is connected to the second voltage detection terminal 16, and the other end of the fourth capacitor 17 is grounded; the second current limiting circuit 18 is set at the second voltage input terminal 19 and the On the connection line of the second voltage detection terminal 16, through the above-mentioned connection method, when the photoreceiver is turned on, the second voltage input terminal 19 is grounded, and the voltage detected by the second voltage detection terminal 16 is zero. When the photoreceiver is not turned on, the voltage detected by the second voltage detection terminal 16 is the voltage of the preset voltage value output by the second voltage input terminal 19. A current limiting circuit is set between the second voltage detection terminal 16 and the second voltage input terminal 19 to prevent the voltage output by the second voltage input terminal 19 from being too large, causing damage to the second voltage detection terminal 16. The second current limiting circuit can be a resistor connected in series in the circuit, or two resistors connected in series in the circuit respectively.

[0062] In this embodiment, a capacitor may be connected in parallel at both ends of the fourth capacitor 17 to prevent the fourth capacitor 17 from being damaged, causing erroneous conduction and resulting in an erroneous electrical signal detected by the first voltage detection end.

[0063] In this embodiment, by simultaneously detecting by the first detection circuit and the second detection circuit, it is possible to determine whether the neutral and live wires of the controller are connected reversely, and whether the ground terminal 6 of the controller is connected to the ground wire.

[0064] Embodiment, for example, the resistance value of the first resistor 7 is 820K ohms, the resistance value of the second resistor 8 is 5.6K ohms, if the voltage value input by the voltage input circuit is 5 volts, the third resistor 13 is 100K ohms, and the fourth resistor 14 is 1K ohm, when the voltage detected by the first voltage detection terminal 9 is 0, and the voltage detected by the second voltage detection terminal 16 is the voltage of the preset voltage value input by the second voltage input terminal 19, it means that the controller ground terminal 6 is not connected to the ground wire; when the voltage detected by the first voltage detection terminal 9 is 0, and the voltage detected by the second voltage detection terminal 16 is zero or a square wave, it means that the neutral and live wires of the controller are connected correctly, and the controller ground terminal 6 is connected to the ground wire, when the voltage detected by the first voltage detection terminal 9 is a half-wave sinusoidal wave, and the voltage detected by the second voltage detection terminal 16 is the voltage of the preset voltage value input by the second voltage input terminal 19, it means that the neutral and live wires of the controller are connected reversely, and the controller ground terminal 6 is not connected to the ground wire.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A controller neutral live wire and ground wire detection circuit, It is characterized in that include: A voltage input circuit connected to the neutral terminal of the controller and inputting a preset voltage to the neutral terminal of the controller; A first detection circuit connected to a ground terminal of the controller and used to detect an electrical signal at the ground terminal of the controller; A second detection circuit connected to the live wire terminal of the controller and the ground terminal of the controller respectively, and used to detect a voltage difference between the live wire terminal of the controller and the ground terminal of the controller; The voltage input circuit comprises: A voltage input terminal for inputting voltage; An input terminal is connected to a voltage input terminal, an output terminal is connected to a neutral terminal of the controller, and a voltage stabilizing device converts a voltage inputted from the voltage input terminal into a preset voltage; The voltage input terminal includes: a voltage terminal and a first capacitor; One end of the first capacitor is connected to the voltage end and the input end of the voltage stabilizing device respectively; The other end of the first capacitor is grounded; The output end of the voltage stabilizing device includes: a positive output end and a negative output end; The positive output terminal is connected to the zero line terminal of the controller and one end of the second capacitor respectively; The other end of the second capacitor and the negative output end are grounded.

2. The controller neutral, live and ground detection circuit according to claim 1, It is characterized in that A current limiting circuit is also arranged between the voltage terminal and the input terminal of the voltage stabilizing device.

3. The controller neutral, live and ground detection circuit according to claim 1, It is characterized in that The first detection circuit includes: a first resistor, a second resistor and a voltage detection circuit; The controller ground terminal, the first resistor and the second resistor are connected in series in sequence, and the second resistor is grounded; The voltage detection circuit is connected in parallel with the second resistor and detects the voltage across the second resistor.

4. The controller neutral, live and ground detection circuit according to claim 3, It is characterized in that The voltage detection circuit comprises: a first voltage detection terminal and a third capacitor; One end of the third capacitor is connected to the ground end of the second resistor; The other end of the third capacitor is connected to the first voltage detection end and the other end of the second resistor respectively.

5. The controller neutral line, live line and ground line detection circuit according to claim 4, It is characterized in that A diode is also provided on the connection line between the second resistor and the first voltage detection terminal; The conducting direction of the diode is from the second resistor to the first voltage detection end.

6. The controller neutral line, live line and ground line detection circuit according to claim 5, It is characterized in that A current limiting circuit and a clamping circuit are also provided on the connection line between the second resistor and the first voltage detection terminal.

7. The controller neutral, live and ground detection circuit according to any one of claims 1 to 6, It is characterized in that The second detection circuit includes: a third resistor, a fourth resistor, an optical coupler and a conduction detection circuit; The live wire end of the controller, the third resistor, the fourth resistor and the ground end of the controller are connected in sequence; The light emitter of the optical coupler is connected in parallel with the fourth resistor; the conducting direction of the light emitter is from the live wire end of the controller to the ground end of the controller; The conduction detection circuit is connected in parallel with the light receiver of the optical coupler and detects the conduction status of the light receiver.

8. The controller neutral, live and ground detection circuit according to claim 7, It is characterized in that The conduction detection circuit comprises: a second voltage detection terminal, a fourth capacitor, a second current limiting circuit and a second voltage input terminal that outputs a voltage of a preset voltage value; One end of the light receiver is connected to the second voltage detection end and the second voltage input end respectively; The other end of the light receiver is grounded; One end of the fourth capacitor is connected to the second voltage detection end, and the other end of the fourth capacitor is grounded; The second current limiting circuit is arranged on a connection line between the second voltage input terminal and the second voltage detection terminal.

Images