Safety input control circuit system

Abstract

The utility model belongs to the field of circuit protection, and particularly relates to a safe input control circuit system, which comprises a power connection module, a rectifier module and a load access module, the rectifier module is connected with two ends of the load access module through a first connecting line and a second connecting line respectively; the circuit system also comprises a switch module; the first control module is connected with the switch module; two ends of the detection circuit are respectively connected with the first connection circuit and the second connection circuit, and the detection circuit is provided with a first detection end and a second detection end; and the first detection end, the second detection end and the first control module are electrically connected with the control module. According to the utility model, when the voltage fluctuation amplitude of the power grid is too large, the power supply to the load can be directly cut off, so that the safety of the load can be effectively protected.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of circuit protection, especially relates to a safe input control circuit system. BACKGROUND

[0002] As a huge and complex power supply system, power grid is influenced by multiple factors in the operation process, resulting in voltage fluctuation. These factors mainly include the following aspects:

[0003] First, the change of power load is one of the important factors causing voltage fluctuation. With the improvement of people's living standards and the development of industrial production, the number of various electrical equipment is increasing, and its operating power and time also show diversification. During the peak period of electricity consumption, a large number of electrical equipment is turned on at the same time, and the required power supply current of the power grid increases sharply, which makes the power grid face great pressure in the process of power supply. According to Ohm's law, when the load of the power grid increases, the current in the line will increase accordingly, and under the condition that the resistance of the transmission line is constant, the voltage drop of the line will increase. For some remote areas or old communities, the infrastructure construction of the power grid is relatively lagging behind, the line is aging, the wire diameter is small, and the line resistance is larger, so the problem of voltage drop is more prominent. On the contrary, during the valley period of electricity consumption, the load of the power grid decreases sharply, the current in the transmission line is small, the voltage drop is reduced, and in some areas, the voltage may even rise.

[0004] Second, power grid failure is also a common cause of voltage fluctuation. The power grid is a complex whole with mutual connection, and any local problem may cause chain reaction. For example, when a short-circuit fault occurs in the transmission line, the impedance at the short-circuit point will decrease instantaneously, causing the current at this point to increase sharply. This will cause the voltage of the line before the fault point to decrease, and the line after the fault point may have a voltage rise due to the automatic adjustment of the power grid. In addition, the failure of key devices such as transformers and busbars in the substation, such as transformer internal winding short circuit and busbar grounding, will also affect the normal power supply of the power grid and cause voltage fluctuation.

[0005] Third, natural environmental factors also have an impact on the voltage of the power grid. Severe weather conditions such as lightning, heavy rain, strong wind and heavy snow may damage the power grid facilities and cause voltage fluctuation. For example, lightning hitting the transmission line or tower will cause a strong current instantaneously, causing the voltage of the power grid to rise sharply and damaging the electrical equipment connected thereto. Strong wind may blow down the tower and break the line, causing line short circuit or open circuit and affecting the normal power supply of the power grid. In cold winter, the icing of the wire will increase the weight and sag of the line, and even cause the line to dance, which may cause the line to trip and affect the voltage stability of the power grid.

[0006] When the fluctuation amplitude of the grid voltage is large, it will have many serious effects on the safe use of electrical equipment. For most electrical equipment, they are designed and manufactured within a specific rated voltage range to ensure that they can operate normally, stably and safely. When the actual voltage deviates too much from the rated voltage, the electrical parameters inside the electrical equipment will change significantly, which is easy to cause a series of safety problems. Practical new type content

[0007] In order to solve the above problems, the purpose of the present application is to provide a safe input control circuit system, which can directly disconnect the power supply when the fluctuation amplitude of the grid voltage is too large, so as to effectively protect the safety of the load.

[0008] In order to achieve the above purpose, the technical scheme of the present application is as follows.

[0009] A safe input control circuit system, which comprises a power connection module for connecting to the grid, a rectifier module for converting alternating current into direct current, and a load connection module for connecting to the load, the power connection module is connected with the rectifier module, the rectifier module is connected with the load connection module through a first connection line and a second connection line, characterized in that the circuit system further comprises:

[0010] A switch module for controlling the on-off of the rectifier module and the load connection module;

[0011] A first control module for controlling the operation of the switch module, the first control module is connected with the switch module;

[0012] A detection line, which is connected with the first connection line and the second connection line at both ends, and a first detection end and a second detection end are arranged on the detection line;

[0013] A second control module for detecting the voltage signals of the first detection end and the second detection end, and controlling the power supply of the first control module, the first detection end, the second detection end and the first control module are electrically connected with the control module.

[0014] In this circuit system, the grid supplies power to the load connection module through the power connection module and the rectifier module. In the process, the first control module controls the operation of the switch module to ensure the normal power supply to the load connection module. When the second control module detects that the voltage value is too high through the first detection end, or detects that the voltage value is too low through the second detection end, the second control module will control the power supply to the first control module to be disconnected, at this time the switch module stops working and disconnects the normal power supply to the load connection module. That is, through the above design, the circuit system can directly disconnect the power supply to the load when the fluctuation amplitude of the grid voltage is too large, so as to effectively protect the safety of the load.

[0015] Further, the power connection module comprises two power connection ends for connecting to the power grid, and the two power connection ends are electrically connected to the rectifier module.

[0016] Further, the power connection module further comprises a fuse, which is arranged between the power connection end connected to the live wire of the power grid and the rectifier module.

[0017] Further, the rectifier module comprises a rectifier.

[0018] Further, the switch module comprises a triode.

[0019] Further, the detection circuit further comprises a voltage dividing module.

[0020] Further, the voltage dividing module comprises four voltage dividing resistors.

[0021] Further, the circuit system further comprises a thermistor for detecting the ambient temperature, one end of the thermistor being electrically connected to the second control module, and the other end of the thermistor being connected to the first connection circuit or the second connection circuit.

[0022] Further, the circuit system further comprises a signal receiving module for receiving an external MCU control signal, one end of the signal receiving module being electrically connected to the second control module, and the other end of the signal receiving module being connected to the first connection circuit or the second connection circuit.

[0023] Further, the load connection module comprises a transformer, a positive direct current output end and a negative direct current output end, the first connection circuit and the second connection circuit being connected to the first connection end and the second connection end of the transformer respectively, and the positive direct current output end and the negative direct current output end being connected to the third connection end and the fourth connection end of the transformer respectively.

[0024] The circuit system has the advantages that, in the circuit system, the power grid supplies power to the load connection module after passing through the power connection module and the rectifier module; in the process, the first control module controls the switch module to work to ensure normal power supply to the load connection module; when the second control module detects that the voltage value is too high through the first detection end or detects that the voltage value is too low through the second detection end, the second control module will control the power supply to the first control module to be disconnected, at which time the switch module stops working and the normal power supply to the load connection module is disconnected; that is, the circuit system can directly disconnect the power supply to the load when the voltage fluctuation range of the power grid is too large, so as to effectively protect the safety of the load. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the circuit principle diagram of the utility model without a figure reference.

[0026] Figure 2 The circuit principle diagram after the figure reference number of the utility model.

[0027] Figure reference number:

[0028] 1, first connection line; 2, second connection line; 3, detection line; 4, first detection end; 5, second detection end; 6, first control module; 7, second control module; 8, power connection end; 9, fuse; 10, rectifier; 11, triode; 12, voltage dividing resistor; 13, thermistor; 14, photoelectric coupler; 15, transformer; 16, positive direct current output end; 17, negative direct current output end. DETAILED DESCRIPTION

[0029] In order to make the utility model's purpose, technical scheme and advantage more clearly clear, following combining with the drawing and example, the utility model is further detailedly explained.It should be understood that the specific example described here is only used to explain the utility model, and is not used to limit the utility model.

[0030] Reference Figures 1-2 , the embodiment provides a kind of safety input control circuit system, wherein, Figure 1 And Figure 2 Respectively provide the circuit principle diagram without figure reference number and the circuit principle diagram after figure reference number, to clearly show the circuit principle of the application;

[0031] The circuit system includes power connection module for accessing power grid, rectification module for converting alternating current into direct current, load access module for accessing power load, power connection module is connected with rectification module, rectification module is connected with load access module two ends respectively by first connection line 1 and second connection line 2, and the circuit system further includes:

[0032] Switching module for controlling the on-off of rectification module and load access module;

[0033] First control module 6 for controlling switching module to work, and first control module 6 is connected with switching module;

[0034] Detection line 3, detection line 3 two ends are connected with first connection line 1, second connection line 2 respectively, and first detection end 4 for detecting whether voltage exceeds maximum value and second detection end 5 for detecting whether voltage is lower than minimum value are provided on detection line 3;

[0035] A second control module 7 is used for detecting the voltage signals of the first detection end 4 and the second detection end 5 and controlling the power supply of the first control module 6. The first detection end 4, the second detection end 5 and the first control module 6 are electrically connected with the control module. When the second control module 7 detects that the voltage value is too high to exceed the maximum value through the first detection end 4 or detects that the voltage value is too low to be lower than the minimum value through the second detection end 5, the second control module 7 will control to disconnect the power supply of the first control module 6. At this time, the switch module stops working and disconnects the normal power supply of the load access module.

[0036] Specifically, the first detection end 4 is used for detecting whether the voltage exceeds the maximum value 8.1V, and the second detection end 5 is used for detecting whether the voltage is lower than the minimum value 1.1V.

[0037] In the embodiment, the power access module includes two power access ends 8 for accessing the power grid, and the two power access ends 8 are electrically connected with the rectifier module. Specifically, the two power access ends 8 access the live wire and the zero line of the power grid, respectively.

[0038] In the embodiment, the power access module further includes a fuse 9, which is arranged between the power access end 8 accessing the live wire of the power grid and the rectifier module. The fuse 9 can play a role of overload protection, so as to further improve the safety of the circuit system.

[0039] In the embodiment, the rectifier module includes a rectifier 10.

[0040] In the embodiment, the switch module includes a triode 11.

[0041] In the embodiment, a voltage dividing module is further arranged on the detection line 3.

[0042] In the embodiment, the voltage dividing module includes four voltage dividing resistors 12.

[0043] In the embodiment, the circuit system further includes a thermistor 13 for detecting the ambient temperature, one end of the thermistor 13 is electrically connected with the second control module 7, and the other end of the thermistor 13 is connected with the first connection line 1 or the second connection line 2.

[0044] In the embodiment, the circuit system further includes a signal receiving module for receiving the external MCU control signal, one end of the signal receiving module is electrically connected with the second control module 7, and the other end of the signal receiving module is connected with the first connection line 1 or the second connection line 2.

[0045] In the embodiment, the signal receiving module includes an optical coupler 14, one end of the light receiver part of the optical coupler 14 is electrically connected with the second control module 7, and the other end is connected with the first connection line 1 or the second connection line 2; and the light source part of the optical coupler 14 is connected with the external MCU, so as to realize the function of receiving the external MCU control signal.Figures 1-2 The image shows the light receiver portion of the optocoupler 14, but the light source portion is not shown.

[0046] In this embodiment, the load access module includes a transformer 15, a positive DC output terminal 16, and a negative DC output terminal 17. The first connection line 1 and the second connection line 2 are respectively connected to the first connection terminal and the second connection terminal of the transformer 15. The positive DC output terminal 16 and the negative DC output terminal 17 are respectively connected to the third connection terminal and the fourth connection terminal of the transformer 15.

[0047] Specifically, the first control module 6 is model OB3636A, and the second control module 7 is model OB3631A. It can be known that the first control module 6 controls the transistor 11 to work through its fourth pin. When the transistor 11 is not working, the circuit system cannot form a loop and the power supply to the load can be disconnected.

[0048] The second control module 7 controls the power supply to the first control module 6 through its sixth pin. The control of the second control module 7 is based on three sets of signal sources: 1. Voltage detection by the first and second detection terminals. When the voltage detected by the first detection terminal 4 exceeds the maximum value of 8.1V, or the voltage detected by the second detection terminal 5 is lower than the minimum value of 1.1V, the second control module 7 controls its sixth pin to pull down to 0V; 2. Ambient temperature detection by the thermistor. When the second control module 7 detects a temperature exceeding 80 degrees Celsius through the thermistor, it controls its sixth pin to pull down to 0V; 3. Control signal from the external MCU. When the second control module 7 receives a control signal from the external MCU through the optocoupler 14, it controls its sixth pin to pull down to 0V.

[0049] Other electronic components also exist in this application; please refer to [link / reference needed] for details. Figures 1-2 The circuit structure is shown in the diagram; for example, a polarized capacitor EC4 is placed between the positive DC output terminal 16 and the negative DC output terminal 17.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A safety input control circuit system, comprising a power connection module for connecting to a power grid, a rectifier module for converting alternating current (AC) to direct current (DC), and a load connection module for connecting an electrical load, wherein the power connection module is connected to the rectifier module, and the rectifier module is connected to both ends of the load connection module via a first connection line and a second connection line, characterized in that, The circuit system also includes: A switching module used to control the connection and disconnection between the rectifier module and the load access module; A first control module for controlling the operation of the switch module, the first control module being connected to the switch module; The detection line is connected to a first connection line and a second connection line at both ends, and the detection line is provided with a first detection end and a second detection end. A second control module is used to detect the voltage signals of the first and second detection terminals and to control the power supply of the first control module. The first detection terminal, the second detection terminal, and the first control module are all electrically connected to the control module.

2. The safe input control circuit system according to claim 1, characterized in that, The power connection module includes two power connection terminals for connecting to the power grid, and both power connection terminals are electrically connected to the rectifier module.

3. The safe input control circuit system according to claim 2, characterized in that, The power connection module also includes a fuse, which is located between the power connection terminal connected to the power grid live wire and the rectifier module.

4. The safe input control circuit system according to claim 1, characterized in that, The rectifier module includes a rectifier.

5. A safe input control circuit system according to claim 1, characterized in that, The switching module includes a transistor.

6. A safe input control circuit system according to claim 1, characterized in that, The detection line is also equipped with a voltage divider module.

7. A safe input control circuit system according to claim 6, characterized in that, The voltage divider module includes four voltage divider resistors.

8. A safe input control circuit system according to claim 1, characterized in that, The circuit system also includes a thermistor for detecting ambient temperature, one end of which is electrically connected to the second control module, and the other end of which is connected to a first connection line or a second connection line.

9. A safe input control circuit system according to claim 1, characterized in that, The circuit system also includes a signal receiving module for receiving external MCU control signals. One end of the signal receiving module is electrically connected to the second control module, and the other end of the signal receiving module is connected to a first connection line or a second connection line.

10. A safe input control circuit system according to any one of claims 1-9, characterized in that, The load access module includes a transformer, a positive DC output terminal, and a negative DC output terminal. The first connection line and the second connection line are respectively connected to the first connection terminal and the second connection terminal of the transformer. The positive DC output terminal and the negative DC output terminal are respectively connected to the third connection terminal and the fourth connection terminal of the transformer.

Images