Current monitoring alarm circuit

Abstract

The utility model discloses a current monitoring and alarming circuit, which relates to the technical field of monitoring and alarming, and comprises a power supply module for supplying power; the load module is used for accessing electric equipment and controlling the electric equipment to stop working; the current detection module is used for current detection and signal processing; the over-current detection module is used for over-current detection, and during over-current, the signal control module carries out self-locking to control the alarm work of the alarm module and controls the working state detection module to start to detect the working state of the load module; and the self-reset control module is used for controlling the signal control module to reset when the working state detection module detects that the load module is restarted and the overcurrent detection module detects overcurrent. When overcurrent occurs, the current monitoring alarm circuit of the utility model stops the work of the load module and gives an alarm, and when the load module is restarted and the overcurrent disappears, the alarm and the work state detection work are automatically stopped, the alarm can be automatically closed, and the alarm means is simple and easy to implement.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring and alarming, in particular to a current monitoring and alarming circuit. Background Art

[0002] With the improvement of the quality of life, electrical equipment is used more and more widely, and people have higher and higher demands on electrical equipment. In order to avoid equipment damage and fire caused by overcurrent, existing electrical equipment has a current monitoring alarm function. When overcurrent occurs, the electrical equipment is disconnected and the alarm is continuously performed. After the overcurrent disappears, the alarm device needs to be turned off manually. The alarm intelligence is not high, and the alarm control method is relatively cumbersome, so it needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides a current monitoring alarm circuit to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A current monitoring alarm circuit comprises: a power module, a load module, a current detection module, an overcurrent detection module, a signal control module, an alarm module, a working state detection module and a self-reset control module;

[0006] A power module, used to access DC power;

[0007] A load module, connected to the power module and the signal control module, for receiving direct current power and connecting to the electric device, and for receiving the first protection signal output by the signal control module and stopping the operation of the connected electric device;

[0008] A current detection module, connected to the load module, for performing current detection on the load module and performing differential amplification and conversion processing on the detected current signal, and for outputting a first detection signal;

[0009] an overcurrent detection module, connected to the current detection module, for setting an overcurrent threshold and outputting a first control signal when the first detection signal is greater than the overcurrent threshold, and outputting a second control signal when the first detection signal is less than the overcurrent threshold;

[0010] A signal control module, connected to the overcurrent detection module and the self-reset control module, used for performing self-locking processing on the first control signal and outputting a first protection signal, and used for receiving a reset signal output by the self-reset control module and performing self-locking reset;

[0011] An alarm module, connected to the signal control module and the power module, and configured to receive the first protection signal and issue an audible alarm;

[0012] A working state detection module, connected to the load module and the signal control module, for receiving the first protection signal and starting to detect the working state of the load module, and for outputting a third control signal when the load module is working;

[0013] The self-reset control module is connected to the working state detection module and is used to output a reset signal when the overcurrent detection module outputs the second control signal and the working state detection module outputs the third control signal.

[0014] As a further solution of the utility model: the power module includes a power interface; the load module includes an electrical device interface; the current detection module includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a second resistor and a first operational amplifier;

[0015] Preferably, the first end of the power supply interface is connected to the first end of the electrical equipment interface, the second end of the electrical equipment interface is connected to one end of the fourth resistor and connected to one end of the fifth resistor and the ground through the third resistor, the other end of the fourth resistor is connected to the in-phase end of the first operational amplifier and is grounded through the second resistor, and the other end of the fifth resistor is connected to the inverting end of the first operational amplifier and is connected to the output end of the first operational amplifier and the overcurrent detection module through the sixth resistor.

[0016] As a further solution of the utility model: the overcurrent detection module includes a first comparator and a first threshold device;

[0017] Preferably, the non-inverting end of the first comparator is connected to the output end of the first operational amplifier, the inverting end of the first comparator is connected to the first threshold device, and the output end of the first comparator is connected to the self-reset control module and the signal control module.

[0018] As a further solution of the utility model: the signal control module includes a first diode, a second power supply, a seventh resistor, a second switch tube, a first logic chip and a second diode; the alarm module includes a third switch tube and an alarm device;

[0019] Preferably, the anode of the first diode is connected to the output end of the first comparator, the cathode of the first diode is connected to the anode of the second diode and the first end of the first logic chip, the second end of the first logic chip is connected to the collector of the second switch tube and is connected to the second power supply through the seventh resistor, the emitter of the second switch tube and the emitter of the third switch tube are both grounded, the third end of the first logic chip is connected to the anode of the second diode, the base of the third switch tube and the third end of the electrical equipment interface, the collector of the third switch tube is connected to one end of the alarm device, the other end of the alarm device is connected to the first end of the power interface, and the base of the second switch tube is connected to the self-reset control module.

[0020] As a further solution of the utility model: the working state detection module includes a first power supply, a first resistor, a first optical coupler and a first switch tube;

[0021] Preferably, the first end of the first optocoupler is connected to the emitter of the first switching tube, the collector of the first switching tube is connected to the second end of the electrical equipment interface, the second end of the first optocoupler is grounded, the base of the first switching tube is connected to the third end of the first logic chip, the third end of the first optocoupler is connected to the first power supply, and the fourth end of the first optocoupler is connected to the self-reset control module and grounded through the first resistor.

[0022] As a further solution of the utility model: the self-reset control module includes a first inverter and a second logic chip;

[0023] Preferably, the input end of the first inverter is connected to the output end of the first comparator, the first end and the second end of the first logic chip are respectively connected to the output end of the first inverter and the fourth end of the first optocoupler, and the third end of the first logic chip is connected to the base of the second switch tube.

[0024] Compared with the prior art, the beneficial effects of the utility model are as follows: the current monitoring alarm circuit of the utility model is composed of a current detection module cooperating with an overcurrent detection module to perform overcurrent detection on a load module, and when overcurrent occurs, the signal control module self-locks and outputs a first protection signal so that the load module receives the signal and stops working, and at the same time controls the alarm work of the alarm module, controls the working state detection module to start detecting the working state of the load module, and when the load module is working, after the overcurrent disappears, the self-reset control module resets the signal control module, and then automatically stops the alarm and working state detection work, the control circuit is simple and easy, the alarm can be automatically turned off, and the alarm means are highly intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The present invention provides a schematic block diagram of a current monitoring alarm circuit.

[0027] Figure 2 A circuit diagram of a current monitoring alarm circuit provided by an example of the utility model.

[0028] Figure 3 This is a connection circuit diagram of a self-resetting control module provided by an example of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In one embodiment, see Figure 1 , a current monitoring alarm circuit, comprising: a power module 1, a load module 2, a current detection module 3, an overcurrent detection module 4, a signal control module 5, an alarm module 6, a working state detection module 7 and a self-reset control module 8;

[0031] Power module 1, used for receiving direct current power;

[0032] The load module 2 is connected to the power module 1 and the signal control module 5, and is used to receive DC power and connect to the power-consuming device, and is used to receive the first protection signal output by the signal control module 5 and stop the operation of the connected power-consuming device;

[0033] A current detection module 3, connected to the load module 2, for performing current detection on the load module 2 and performing differential amplification and conversion processing on the detected current signal, and for outputting a first detection signal;

[0034] An overcurrent detection module 4, connected to the current detection module 3, for setting an overcurrent threshold and outputting a first control signal when the first detection signal is greater than the overcurrent threshold, and outputting a second control signal when the first detection signal is less than the overcurrent threshold;

[0035] A signal control module 5, connected to the overcurrent detection module 4 and the self-reset control module 8, for performing self-locking processing on the first control signal and outputting a first protection signal, and for receiving a reset signal output by the self-reset control module 8 and performing self-locking reset;

[0036] An alarm module 6, connected to the signal control module 5 and the power module 1, for receiving the first protection signal and making a sound alarm;

[0037] A working state detection module 7, connected to the load module 2 and the signal control module 5, for receiving the first protection signal and starting to detect the working state of the load module 2, and for outputting a third control signal when the load module 2 is working;

[0038] The self-reset control module 8 is connected to the working state detection module 7 and is used to output a reset signal when the overcurrent detection module 4 outputs the second control signal and the working state detection module 7 outputs the third control signal.

[0039] In a specific embodiment, the power module 1 can adopt a power circuit composed of a power interface to access DC power; the load module 2 can adopt a load circuit composed of an electrical device interface to connect to an electrical device, which will stop working when receiving the first protection signal output by the signal control module 5, and can be manually controlled to restart the electrical device; the current detection module 3 can adopt a current detection circuit composed of a resistor, an operational amplifier, etc. to detect the current of the electric energy flowing through the load module 2, and perform differential amplification and current-voltage conversion on the detected signal; the overcurrent detection module 4 can adopt an overcurrent detection circuit composed of a comparator, etc., which can set an overcurrent threshold and detect the overcurrent by comparing the overcurrent detection signal. The current threshold and the size of the output signal of the current detection module 3 are used to determine whether overcurrent occurs; the above-mentioned signal control module 5 can adopt a signal control circuit composed of logic chips, diodes, transistors, etc. to perform high-level self-locking processing on the input signal; the above-mentioned alarm module 6 can adopt an alarm circuit composed of an alarm device and a transistor to perform alarm work; the above-mentioned working state detection module 7 can adopt a working state detection circuit composed of a photoelectric coupler, a transistor, etc. to detect the working state of the load module 2 after overcurrent occurs; the above-mentioned self-reset control module 8 can adopt a self-reset control circuit composed of an inverter and a logic chip to reset the signal control module 5 after the load module 2 returns to normal.

[0040] In another embodiment, see Figure 1 , Figure 2 and Figure 3 , the power module 1 includes a power interface; the load module 2 includes an electrical device interface; the current detection module 3 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second resistor R2 and a first operational amplifier OP1;

[0041] Specifically, the first end of the power supply interface is connected to the first end of the electrical equipment interface, the second end of the electrical equipment interface is connected to one end of the fourth resistor R4 and is connected to one end of the fifth resistor R5 and the ground through the third resistor R3, the other end of the fourth resistor R4 is connected to the in-phase end of the first operational amplifier OP1 and is grounded through the second resistor R2, and the other end of the fifth resistor R5 is connected to the inverting end of the first operational amplifier OP1 and is connected to the output end of the first operational amplifier OP1 and the overcurrent detection module 4 through the sixth resistor R6.

[0042] In a specific embodiment, the third resistor R3 can be a current sampling resistor; the first operational amplifier OP1 can be an OP07 operational amplifier, which cooperates with the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the second resistor R2 to perform differential amplification and current-voltage conversion on the sampled signal.

[0043] Further, the overcurrent detection module 4 includes a first comparator A1 and a first threshold device;

[0044] Specifically, the non-inverting terminal of the first comparator A1 is connected to the output terminal of the first operational amplifier OP1 , the inverting terminal of the first comparator A1 is connected to the first threshold device, and the output terminal of the first comparator A1 is connected to the self-reset control module 8 and the signal control module 5 .

[0045] In a specific embodiment, the first comparator A1 may be a LM358 comparator; the first threshold device may be composed of a reference power supply and a resistor to provide an overcurrent threshold.

[0046] Further, the signal control module 5 includes a first diode D1, a second power supply VCC2, a seventh resistor R7, a second switch tube VT2, a first logic chip U2 and a second diode D2; the alarm module 6 includes a third switch tube VT3 and an alarm device;

[0047] Specifically, the anode of the first diode D1 is connected to the output end of the first comparator A1, the cathode of the first diode D1 is connected to the anode of the second diode D2 and the first end of the first logic chip U2, the second end of the first logic chip U2 is connected to the collector of the second switch tube VT2 and is connected to the second power supply VCC2 through the seventh resistor R7, the emitter of the second switch tube VT2 and the emitter of the third switch tube VT3 are both grounded, the third end of the first logic chip U2 is connected to the anode of the second diode D2, the base of the third switch tube VT3 and the third end of the electrical equipment interface, the collector of the third switch tube VT3 is connected to one end of the alarm device, the other end of the alarm device is connected to the first end of the power interface, and the base of the second switch tube VT2 is connected to the self-reset control module 8.

[0048] In a specific embodiment, the first logic chip U2 can be an AND gate logic chip, which cooperates with the first diode D1, the second diode D2, the second power supply VCC2 and the seventh resistor R7 to perform self-locking processing on the input high-level signal. The second power supply VCC2 and the seventh resistor R7 provide a high level for the second end of the first logic chip U2; the second switch tube VT2 can be an NPN transistor, which is used to lower the potential of the second end of the first logic chip U2; the third switch tube VT3 can be an NPN transistor; the alarm device can use a speaker.

[0049] Furthermore, the working state detection module 7 includes a first power supply VCC1, a first resistor R1, a first optical coupler U1 and a first switch tube VT1;

[0050] Specifically, the first end of the first optocoupler U1 is connected to the emitter of the first switch tube VT1, the collector of the first switch tube VT1 is connected to the second end of the electrical equipment interface, the second end of the first optocoupler U1 is grounded, the base of the first switch tube VT1 is connected to the third end of the first logic chip U2, the third end of the first optocoupler U1 is connected to the first power supply VCC1, and the fourth end of the first optocoupler U1 is connected to the self-reset control module 8 and grounded through the first resistor R1.

[0051] In a specific embodiment, the first optical coupler U1 may be a PC817 photoelectric coupler; and the first switch tube VT1 may be an NPN transistor.

[0052] Furthermore, the self-reset control module 8 includes a first inverter INV1 and a second logic chip U3;

[0053] Specifically, the input end of the first inverter INV1 is connected to the output end of the first comparator A1, the first end and the second end of the first logic chip U2 are respectively connected to the output end of the first inverter INV1 and the fourth end of the first optocoupler U1, and the third end of the first logic chip U2 is connected to the base of the second switch tube VT2.

[0054] In a specific embodiment, the second logic chip U3 may be an AND gate logic chip.

[0055] In a current monitoring alarm circuit of the present embodiment, a power interface is connected to direct current power, and power is supplied to the power-consuming device connected to the power-consuming device interface, a third resistor R3 performs current sampling, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second resistor R2 and a first operational amplifier OP1 perform differential amplification processing and current-voltage conversion processing on the adopted signal, a first threshold device sets an overcurrent threshold so that a first comparator A1 detects the magnitude of the processed signal and the overcurrent threshold, and when the signal output by the first operational amplifier OP1 is greater than the overcurrent threshold, the first comparator A1 outputs a high-level first control signal, and causes the third end of the first logic chip U2 to continuously output a high-level first protection signal, thereby controlling the third switch tube VT 3 and the second switch tube VT2 are turned on, the electrical equipment connected to the electrical equipment interface stops working, and the alarm device performs an overcurrent alarm. When the electrical equipment is restarted, the first optical coupler U1 will be turned on and detect the restart of the electrical equipment, and at the same time provide a high level for the second end of the second logic chip U3. At this time, if there is no overcurrent phenomenon, the first comparator A1 will output a low-level second control signal, and the first inverter INV1 will perform inversion processing to provide a high level for the first end of the second logic chip U3. The third end of the second logic chip U3 will output a high-level reset signal and control the second switch tube VT2 to turn on. At this time, the first logic chip U2 is reset, the first switch tube VT1 and the third switch tube VT3 are turned off, and the alarm device stops alarming.

[0056] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A current monitoring alarm circuit, characterized in that: The current monitoring alarm circuit includes: a power module, a load module, a current detection module, an overcurrent detection module, a signal control module, an alarm module, a working state detection module and a self-reset control module; The power module is used to access direct current power; The load module is connected to the power module and the signal control module, and is used to receive direct current power and connect to the power-consuming device, and is used to receive the first protection signal output by the signal control module and stop the operation of the connected power-consuming device; The current detection module is connected to the load module, and is used to detect the current of the load module and perform differential amplification and conversion processing on the detected current signal, so as to output a first detection signal; The overcurrent detection module is connected to the current detection module, and is used to set an overcurrent threshold and output a first control signal when the first detection signal is greater than the overcurrent threshold, and output a second control signal when the first detection signal is less than the overcurrent threshold; The signal control module is connected to the overcurrent detection module and the self-reset control module, and is used to perform self-locking processing on the first control signal and output a first protection signal, and is used to receive a reset signal output by the self-reset control module and perform self-locking reset; The alarm module is connected to the signal control module and the power module, and is used to receive the first protection signal and issue an audible alarm; The working state detection module is connected to the load module and the signal control module, and is used to receive the first protection signal and start detecting the working state of the load module, and is used to output a third control signal when the load module is working; The self-reset control module is connected to the working state detection module, and is used to output a reset signal when the overcurrent detection module outputs the second control signal and the working state detection module outputs the third control signal.

2. A current monitoring alarm circuit according to claim 1, characterized in that: The power module includes a power interface; the load module includes an electrical device interface; the current detection module includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a second resistor and a first operational amplifier; The first end of the power interface is connected to the first end of the electrical device interface, the second end of the electrical device interface is connected to one end of the fourth resistor and is connected to one end of the fifth resistor and the ground through the third resistor, the other end of the fourth resistor is connected to the in-phase end of the first operational amplifier and is grounded through the second resistor, and the other end of the fifth resistor is connected to the inverting end of the first operational amplifier and is connected to the output end of the first operational amplifier and the overcurrent detection module through the sixth resistor.

3. A current monitoring alarm circuit according to claim 2, characterized in that: The overcurrent detection module includes a first comparator and a first threshold device; The non-inverting end of the first comparator is connected to the output end of the first operational amplifier, the inverting end of the first comparator is connected to the first threshold device, and the output end of the first comparator is connected to the self-reset control module and the signal control module.

4. A current monitoring alarm circuit according to claim 3, characterized in that: The signal control module includes a first diode, a second power supply, a seventh resistor, a second switch tube, a first logic chip and a second diode; the alarm module includes a third switch tube and an alarm device; The anode of the first diode is connected to the output end of the first comparator, the cathode of the first diode is connected to the anode of the second diode and the first end of the first logic chip, the second end of the first logic chip is connected to the collector of the second switch tube and is connected to the second power supply through the seventh resistor, the emitter of the second switch tube and the emitter of the third switch tube are both grounded, the third end of the first logic chip is connected to the anode of the second diode, the base of the third switch tube and the third end of the electrical equipment interface, the collector of the third switch tube is connected to one end of the alarm device, the other end of the alarm device is connected to the first end of the power interface, and the base of the second switch tube is connected to the self-reset control module.

5. A current monitoring alarm circuit according to claim 4, characterized in that: The working state detection module includes a first power supply, a first resistor, a first optical coupler and a first switch tube; The first end of the first optocoupler is connected to the emitter of the first switching tube, the collector of the first switching tube is connected to the second end of the electrical equipment interface, the second end of the first optocoupler is grounded, the base of the first switching tube is connected to the third end of the first logic chip, the third end of the first optocoupler is connected to the first power supply, and the fourth end of the first optocoupler is connected to the self-reset control module and grounded through the first resistor.

6. A current monitoring alarm circuit according to claim 5, characterized in that: The self-reset control module includes a first inverter and a second logic chip; The input end of the first inverter is connected to the output end of the first comparator, the first end and the second end of the first logic chip are respectively connected to the output end of the first inverter and the fourth end of the first optocoupler, and the third end of the first logic chip is connected to the base of the second switch tube.

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