Relay function indication system and electronic thermal overload relay

Abstract

The embodiment of the utility model discloses a relay function indicating system and an electronic thermal overload relay. The indicating system comprises a control unit and a plurality of indicating units, each indicating unit comprises an indicating circuit, a sampling circuit and a display knob; the indicating circuit comprises a potentiometer; the display knob is used for acquiring a potential adjusting instruction and adjusting the potentiometer based on the potential adjusting instruction; the control unit is used for acquiring a first resistance value of the potentiometer, determining an output voltage of the potentiometer based on the first resistance value, determining a display digital signal based on a working voltage of the sampling circuit and the output voltage, and controlling the display knob to indicate a corresponding function of the relay based on a preset digital signal interval in which the display digital signal falls. According to the utility model, the technical problems of complex control, high cost and more port resource occupation when multiple functions of the relay are indicated in the prior art are solved.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of relays, and in particular to a relay function indication system and an electronic thermal overload relay. Background Art

[0002] Electronic thermal overload relays are a commonly used type of relay that detects faults by detecting current amplitude. During normal operation, negative-sequence and zero-sequence components are absent or minimal. Their presence indicates an asymmetric fault. Compared to traditional thermal relays, electronic thermal overload relays offer advantages such as fast response, high accuracy, and the ability to implement multiple protection functions. They typically incorporate electronic components and associated circuitry, utilizing semiconductor contactless technologies. This allows for flexible adjustment of response speed, long connection life, precision manufacturing, and the ability to respond to even the slightest current changes.

[0003] Electronic thermal overload relays usually integrate multiple functions, usually more than four, so there is a need for a multi-function indication and setting system design. Generally, there are several solutions for multi-function indication and setting: (1) digital tube or display screen display. This solution has a clear and intuitive display, but the disadvantage is that the control is complex and the cost is high; (2) using multiple dip switches, multiple potentiometers or encoding devices, using one device for each function to indicate and set. This solution is simple to control, but the disadvantage is that the control unit I / O port resources are more occupied and the cost is relatively high. Utility Model Content

[0004] The embodiments of the present invention provide a relay function indication system and an electronic thermal overload relay, which solve the technical problems of complex control, high cost and large port resource occupation in the prior art when indicating multiple functions of relays.

[0005] The embodiment of the utility model provides an indication system for relay functions, the indication system comprising a control unit and a plurality of indication units; each of the indication units is electrically connected to the control unit;

[0006] The indicating unit includes an indicating circuit, a sampling circuit and a display knob; the indicating circuit includes a potentiometer;

[0007] The potentiometer, the sampling circuit, and the display knob are all electrically connected to the control unit; the potentiometer is electrically connected to the display knob and the sampling circuit respectively;

[0008] The display knob is used to obtain a potential adjustment instruction and adjust the potentiometer based on the potential adjustment instruction;

[0009] The control unit is used to obtain a first resistance value of the potentiometer, determine the output voltage of the potentiometer based on the first resistance value, determine a display digital signal based on the operating voltage of the sampling circuit and the output voltage, and control the corresponding function of the display knob indication relay based on the preset digital signal interval within which the display digital signal falls, wherein the preset digital signal interval is divided based on the recognizable digital signal range of the control unit, and one preset digital signal interval corresponds to a display area in one of the display knobs for function display, and one display knob includes at least four of the display areas.

[0010] Furthermore, the control unit further includes a voltage determination module;

[0011] The voltage determination module is based on V0=VDD*(R X -R L ) / (R X +R L ) to determine the output voltage of the potentiometer, wherein V0 is the output voltage, R L is the first resistance value, R X is the maximum value of the resistance adjustment range of the potentiometer, and VDD is the input voltage of the potentiometer.

[0012] Further, the control unit includes a signal determination module;

[0013] The signal determination module determines the display digital signal based on the working power supply and the output voltage of the sampling circuit using VADC=2N*V0 / VCC, where VADC is the display digital signal, N is the word length of the sampling circuit in bits, and VCC is the working voltage.

[0014] Furthermore, the indicating circuit further includes a current limiting resistor and a first power supply;

[0015] A first end of the current limiting resistor is electrically connected to the movable end of the potentiometer, and a second end of the current limiting resistor is electrically connected to the sampling circuit;

[0016] A first end of the potentiometer is electrically connected to the first power supply, and a second end of the potentiometer is grounded.

[0017] Furthermore, the indicating unit further includes a filtering circuit;

[0018] The filter circuit includes a filter capacitor, a first end of the filter capacitor is electrically connected to the second end of the current limiting resistor, and a second end of the filter capacitor is grounded.

[0019] Furthermore, the indication system further comprises an indicator light circuit; the indicator light circuit is electrically connected to the control unit;

[0020] The indicator light circuit includes at least two indicator light units, and the indicator light units are connected in parallel;

[0021] Each of the indicator light units includes a first resistor, a light emitting diode, a transient suppression diode, and a first capacitor;

[0022] The first end of the first resistor is electrically connected to the second power supply, the second end of the first resistor is electrically connected to the anode of the light emitting diode, and the cathode of the light emitting diode is electrically connected to the control unit;

[0023] One end of the transient suppression diode is electrically connected to the cathode of the light emitting diode, and the other end of the transient suppression diode is grounded;

[0024] A first end of the first capacitor is electrically connected to the cathode of the light emitting diode, and a second end of the first capacitor is grounded.

[0025] An embodiment of the present utility model further provides an electronic thermal overload relay, which includes the indication system of the relay function described in any of the above embodiments.

[0026] The present invention discloses a relay function indication system and an electronic thermal overload relay. The indication system includes a control unit and multiple indication units; the indication units are electrically connected to the control unit; each indication unit includes an indication circuit, a sampling circuit, and a display knob; the indication circuit includes a potentiometer; the potentiometer, the sampling circuit, and the display knob are all electrically connected to the control unit; the potentiometers are respectively electrically connected to the display knob and the sampling circuit; the display knob is used to obtain a potential adjustment instruction and adjust the potentiometer based on the potential adjustment instruction; the control unit is used to obtain a first resistance value of the potentiometer, determine an output voltage of the potentiometer based on the first resistance value, determine a display digital signal based on the operating voltage and output voltage of the sampling circuit, and control the display knob to indicate the corresponding function of the relay based on the preset digital signal range within which the displayed digital signal falls. The utility model solves the technical problems of complex control, high cost, and large port resource usage in the prior art when indicating multiple functions of a relay by using a single potentiometer, thereby achieving the technical effects of reducing the complexity of relay display control, reducing the cost of the display system, and reducing the port resource usage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an appearance diagram of a relay function indication system provided by an embodiment of the present invention;

[0028] Figure 2 This is a circuit diagram of a relay function indication system provided by an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of a display knob 20 provided in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of an indicator light circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] It should be noted that the terms "first," "second," and so on, in the specification, claims, and drawings of this utility model are used to distinguish different objects, rather than to limit a specific order. The following embodiments of this utility model can be implemented independently or in combination with each other, and this utility model does not impose specific limitations on this.

[0033] Figure 1 and Figure 2 They are respectively an appearance diagram and a circuit diagram of a relay function indication system provided by an embodiment of the present invention.

[0034] For example, Figure 1 The present invention provides an appearance diagram of an indication system of an electronic thermal overload relay having three display knobs, wherein display knob 10 is used to indicate the trip level adjustment function and the on / off indication of the ground fault protection function, display knob 20 is used to indicate the automatic / manual reset function and the on / off indication of the three-phase current imbalance function, and display knob 30 is used to indicate the on / off function of the set current and the size adjustment function.

[0035] like Figure 2 As shown, the indication system of the relay function includes a control unit 40 and a plurality of indication units ( Figure 2 An example with three indicating units is given as an example, including indicating unit 31, indicating unit 32, and indicating unit 33); each indicating unit is electrically connected to the control unit 40.

[0036] The indicating unit 31 includes an indicating circuit, a sampling circuit ( Figure 2 The diagram of the sampling circuit is not given, only the sampling point TP1 of the sampling circuit and a display knob ( Figure 2 The indicating circuit includes a potentiometer RP1;

[0037] The potentiometer RP1 , the sampling circuit, and the display knob are all electrically connected to the control unit 40 ; the potentiometer RP1 is electrically connected to the display knob and the sampling circuit respectively.

[0038] The display knob is used to obtain a potential adjustment instruction and adjust the potentiometer based on the potential adjustment instruction;

[0039] The control unit 40 is used to obtain a first resistance value of the potentiometer RP1, determine the output voltage of the potentiometer RP based on the first resistance value, determine the display digital signal based on the operating voltage and output voltage of the sampling circuit, and control the display knob to indicate the corresponding function of the relay based on the preset digital signal interval within which the displayed digital signal falls. The preset digital signal interval is divided based on the recognizable digital signal range of the control unit 40, and one preset digital signal interval corresponds to a display area in a display knob for function display, and one display knob includes at least four display areas.

[0040] Similarly, the indicating unit 32 includes an indicating circuit, a sampling circuit ( Figure 2 The diagram of the sampling circuit is not given, only the sampling point TP2 of the sampling circuit and a display knob ( Figure 2 indicating circuit includes a potentiometer RP2, the connection structure of the components in the indicating unit 32, the circuit principle are the same as those of the indicating unit 31, and will not be repeated here.

[0041] Similarly, the indicating unit 33 includes an indicating circuit, a sampling circuit ( Figure 2 The diagram of the sampling circuit is not given, only the sampling point TP3 of the sampling circuit and a display knob ( Figure 2 indicating circuit includes a potentiometer RP3, the connection structure of the components in the indicating unit 33, the circuit principle are the same as those of the indicating unit 31, and will not be repeated here.

[0042] Figure 3 is a schematic diagram of the display knob 20 provided in an embodiment of the present invention, such as Figure 3 As shown, the display knob 20 includes white 1 and white 2 areas on the left, and gray 1 and gray 2 areas on the right, that is, it is divided into four areas. Each area corresponds to a different preset digital signal interval. When it is determined that the displayed digital signal falls into the preset digital signal interval, the area corresponding to the corresponding preset digital signal interval lights up to indicate the corresponding function.

[0043] For example, see Figure 3 , you can set the left white 1 and white 2 areas to light up for function one to be on, and the right gray 1 and gray 2 areas to light up for function one to be off; the white 2 and gray 2 areas to light up for function two to be on, and the white 1 and gray 1 areas to light up for function two to be off. The corresponding truth table is shown in Table 1 below.

[0044] Table 1 shows the truth table of the functional area division of the knob 20

[0045]

[0046] The utility model solves the technical problems of complex control, high cost and large port resource occupation when indicating multiple functions of a relay in the prior art by using one potentiometer to indicate more than two functions, and achieves the technical effects of reducing the display control complexity of the relay, reducing the cost of the display system and reducing the occupation of port resources.

[0047] Optionally, the control unit 40 further includes a voltage determination module; the voltage determination module is based on V0=VDD*(R X -R L ) / (R X +R L ) Determine the output voltage V0 of the potentiometer, where V0 is the output voltage, R L is the first resistance, R X is the maximum value of the resistance adjustment range of the potentiometer, and VDD is the input voltage of the potentiometer.

[0048] Specifically, if Figure 2 As shown, taking the potentiometer RP1 in the indicating unit 31 connected to the display knob 10 as an example, the input voltage VDD of the potentiometer RP1 is 3.3V, and the first resistance R L is the resistance of the movable end 2 of the potentiometer RP1 close to the input voltage VDD. At this time, the output voltage V0 of the potentiometer RP1 is the value divided by the first resistance R L In addition to the partial resistance represented by the voltage value of the remaining partial resistance in the circuit connected to the indicating unit 31, when the maximum value of the resistance adjustment range of the potentiometer RP1 is R X When the output voltage of the potentiometer is V0=VDD*(R X -R L ) / (R X +R L ).

[0049] Optionally, the control unit 40 includes a signal determination module; the signal determination module determines the display digital signal based on the operating voltage and output voltage of the sampling circuit using VADC=2N*V0 / VCC, where VADC is the display digital signal, N is the word length of the sampling circuit in bits, and VCC is the operating voltage.

[0050] Specifically, if Figure 2As shown, still taking the potentiometer RP1 in the indication unit 31 connected to the display knob 10 as an example, after obtaining the output voltage V0 of the potentiometer RP1, the signal determination module in the control unit 40 determines the corresponding display digital signal based on the operating voltage VCC of the sampling circuit and the output voltage V0 of the potentiometer RP1 using VADC=2N*V0 / VCC.

[0051] After the control unit 40 obtains the display digital signal, it determines the preset digital signal interval into which the display digital signal falls. The preset digital signal interval corresponds to a display area of the display knob, such as Figure 1 As shown, the display knob 10 includes a function indication for trip level adjustment (i.e., function three) and an on / off indication for the ground fault protection function (i.e., function four). The display knob 10 includes a white area on the left and a gray area on the right. The white area corresponds to the on state of the ground fault protection function (i.e., function three is on), and the gray area corresponds to the off state of the ground fault protection function (i.e., function three is off). The indication numbers in the white area and the gray area are both used to represent the indication of the trip protection level (i.e., function four).

[0052] Different preset digital signal intervals correspond to different function indications. When it is determined that the displayed digital signal falls into the preset digital signal interval, the area corresponding to the preset digital signal interval lights up to indicate the corresponding function represented by the display knob 10.

[0053] Alternatively, as Figure 2 As shown, taking the indicating circuit in the indicating unit 31 as an example, the indicating circuit further includes a current limiting resistor R1 and a first power supply VDD;

[0054] The first end of the current limiting resistor R1 is electrically connected to the movable end 2 of the potentiometer RP1, and the second end of the current limiting resistor R1 is electrically connected to the sampling circuit; the first end 1 of the potentiometer RP1 is electrically connected to the first power supply VDD, and the second end 3 of the potentiometer RP1 is grounded GND.

[0055] Similarly, the indicating circuit in the indicating unit 32 also includes a current limiting resistor R2 and a potentiometer RP2, and their connection relationship and circuit principles are the same as those of the indicating circuit in the indicating unit 31; the indicating circuit in the indicating unit 33 also includes a current limiting resistor R3 and a potentiometer RP3, and their connection relationship and circuit principles are the same as those of the indicating circuit in the indicating unit 31, which will not be repeated here.

[0056] Alternatively, as Figure 2 As shown, the indicating unit 31 also includes a filtering circuit;

[0057] The filter circuit includes a filter capacitor C1 , a first end of the filter capacitor C1 is electrically connected to a second end of the current limiting resistor R1 , and a second end of the filter capacitor C1 is grounded GND.

[0058] Similarly, the filtering circuit in the indicating unit 32 includes a filtering capacitor C2, and its connection relationship and circuit principle are the same as those of the filtering circuit in the indicating unit 31; the filtering circuit in the indicating unit 33 includes a filtering capacitor C3, and its connection relationship and circuit principle are the same as those of the filtering circuit in the indicating unit 31, which will not be repeated here.

[0059] Figure 4 This is a schematic diagram of an indicator light circuit provided by an embodiment of the present utility model.

[0060] Alternatively, as Figure 4 As shown, the indicator system also includes an indicator light circuit; the indicator light circuit is electrically connected to the control unit 40; the indicator light circuit includes at least two indicator light units ( Figure 4 , which exemplarily shows a schematic diagram of two indicator light units, wherein the indicator light units are connected in parallel;

[0061] See also Figure 4 The indicator light unit 51 includes a first resistor Rn1, a light emitting diode D1, a transient voltage suppressor diode Z1 and a first capacitor Cn1.

[0062] A first end of the first resistor Rn1 is electrically connected to the second power supply VCC21, a second end of the first resistor Rn1 is electrically connected to the anode of the light-emitting diode D1, and a cathode of the light-emitting diode D1 is electrically connected to the control unit 40; one end of the transient suppression diode Z1 is electrically connected to the cathode of the light-emitting diode D1, and the other end of the transient suppression diode Z1 is grounded GND; a first end of the first capacitor Cn1 is electrically connected to the cathode of the light-emitting diode D1, and a second end of the first capacitor Cn1 is grounded GND.

[0063] Similarly, Figure 4 Another indicator light unit 52 includes a second resistor Rn2, a light-emitting diode D2, a transient suppression diode Z2 and a second capacitor Cn2, and the first end of the second resistor Rn2 is electrically connected to the third power supply VCC22. The connection structure and circuit principle of each component in the indicator light unit 52 are the same as those of the indicator light unit 51 and are not repeated here.

[0064] Specifically, Figure 4 The two indicator light units are the fault alarm indicator light of the electronic thermal overload relay and the power indicator light of the electronic thermal overload relay.

[0065] On the basis of the above technical solutions, an indicator light unit may be added as needed to add indicator lights for other functions of the electronic thermal overload relay, which will not be described in detail here.

[0066] The relay function indication system provided by the embodiment of the present invention executes the relay function indication method in the above embodiment. Therefore, the relay function indication system provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0067] An embodiment of the present utility model further provides an electronic thermal overload relay, which includes the indication system of the relay function in any of the above embodiments.

[0068] The electronic thermal overload relay provided by the embodiment of the present invention includes the indication system of the relay function in the above embodiment. Therefore, the electronic thermal overload relay provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0069] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0070] Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A relay function indication system, characterized in that: The indication system includes a control unit and a plurality of indication units; each of the indication units is electrically connected to the control unit; The indicating unit includes an indicating circuit, a sampling circuit and a display knob; the indicating circuit includes a potentiometer; The potentiometer, the sampling circuit, and the display knob are all electrically connected to the control unit; the potentiometer is electrically connected to the display knob and the sampling circuit respectively; The display knob is used to obtain a potential adjustment instruction and adjust the potentiometer based on the potential adjustment instruction; The control unit is used to obtain a first resistance value of the potentiometer, determine the output voltage of the potentiometer based on the first resistance value, determine a display digital signal based on the operating voltage of the sampling circuit and the output voltage, and control the corresponding function of the display knob indication relay based on the preset digital signal interval within which the display digital signal falls, wherein the preset digital signal interval is divided based on the recognizable digital signal range of the control unit, and one preset digital signal interval corresponds to a display area in one of the display knobs for function display, and one display knob includes at least four of the display areas.

2. The relay function indication system according to claim 1, characterized in that: The control unit further includes a voltage determination module; The voltage determination module is based on V0=VDD*(R X -R L ) / (R X +R L ) to determine the output voltage of the potentiometer, wherein V0 is the output voltage, R L is the first resistance value, R X is the maximum value of the resistance adjustment range of the potentiometer, and VDD is the input voltage of the potentiometer.

3. The relay function indication system according to claim 1, characterized in that: The control unit includes a signal determination module; The signal determination module determines the display digital signal based on the working power supply and the output voltage of the sampling circuit using VADC=2N*V0 / VCC, where VADC is the display digital signal, N is the word length of the sampling circuit in bits, and VCC is the working voltage.

4. The relay function indication system according to claim 1, characterized in that: The indicating circuit further includes a current limiting resistor and a first power supply; A first end of the current limiting resistor is electrically connected to the movable end of the potentiometer, and a second end of the current limiting resistor is electrically connected to the sampling circuit; A first end of the potentiometer is electrically connected to the first power supply, and a second end of the potentiometer is grounded.

5. The relay function indication system according to claim 4, characterized in that: The indicating unit further includes a filtering circuit; The filter circuit includes a filter capacitor, a first end of the filter capacitor is electrically connected to the second end of the current limiting resistor, and a second end of the filter capacitor is grounded.

6. The relay function indication system according to claim 1, characterized in that: The indicator system further includes an indicator light circuit; the indicator light circuit is electrically connected to the control unit; The indicator light circuit includes at least two indicator light units, and the indicator light units are connected in parallel; Each of the indicator light units includes a first resistor, a light emitting diode, a transient suppression diode, and a first capacitor; The first end of the first resistor is electrically connected to the second power supply, the second end of the first resistor is electrically connected to the anode of the light emitting diode, and the cathode of the light emitting diode is electrically connected to the control unit; One end of the transient suppression diode is electrically connected to the cathode of the light emitting diode, and the other end of the transient suppression diode is grounded; A first end of the first capacitor is electrically connected to the cathode of the light emitting diode, and a second end of the first capacitor is grounded.

7. An electronic thermal overload relay, characterized in that: The electronic thermal overload relay comprises a relay function indication system according to any one of claims 1 to 6 .

Images