Fuse alarm circuit and device

Abstract

The invention discloses a fuse alarm circuit and device. The circuit comprises an anode power supply end, a cathode power supply end and a first alarm branch, the first alarm branch comprises a first optocoupler, a first load end, a first fuse, a first diode, a second diode and a first branch alarm output end; the emitter of the first optocoupler is connected with the first branch alarm output end, the collector is connected with the positive power supply end, the cathode is connected with the cathode of the first diode and the negative power supply end, and the anode is connected with the cathode of the second diode; the positive power supply end is also respectively connected with the first end of the first fuse and the anode of the second diode; the cathode of the first diode is further connected with the negative power supply end, and the anode of the first diode is further connected with the second end of the first fuse and the first load end. According to the circuit, the fuse is monitored through the optocoupler, so that the accuracy of alarming the disconnection of the fuse by the fuse alarm circuit is improved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit design, and in particular to a fuse alarm circuit and device. Background Art

[0002] Fuse alarm circuits are usually used to send out an alarm signal in case the fuse is blown.

[0003] At present, most fuse alarm circuits use mechanical alarm components or relays. Among them, regarding the fuse alarm circuit using a mechanical alarm component, it mainly connects the fuse to the spring. When the fuse is disconnected, the connection between the fuse and the spring is disconnected, and the spring triggers the alarm signal sending button under its elastic action, thereby sending an alarm signal. However, since the spring in this type of mechanical fuse alarm circuit is in a bent state for a long time, it is easy to cause the spring's elasticity to fail, affecting the spring's rebound.

[0004] Regarding the fuse alarm circuit using relays, the main thing is to save power on the fuse. In order to send out an alarm signal when the fuse is disconnected, the relay needs to be energized all the time. If the relay is energized for a long time, it will reduce the life of the relay and affect the performance of the relay, which is prone to relay failure and false alarms.

[0005] That is to say, the currently commonly used fuse alarm circuit does not have sufficient stability, which results in the fuse alarm circuit not having a high enough accuracy in alarming when the fuse is disconnected. Summary of the invention

[0006] The purpose of the present application is to provide a fuse alarm circuit and device, which can improve the stability of the fuse alarm circuit, thereby improving the accuracy of the fuse alarm circuit in alarming a fuse disconnection.

[0007] In the first aspect, the present application provides a fuse alarm circuit, comprising a positive power supply terminal, a negative power supply terminal and a first alarm branch; the first alarm branch comprises a first optocoupler, a first load terminal, a first fuse, a first diode, a second diode and a first branch alarm output terminal; the emitter of the first optocoupler is connected to the first branch alarm output terminal, the collector of the first optocoupler is connected to the positive power supply terminal, the cathode of the first optocoupler is respectively connected to the cathode of the first diode and the negative power supply terminal, and the anode of the first optocoupler is connected to the cathode of the second diode; the positive power supply terminal is also respectively connected to the first end of the first fuse and the anode of the second diode; the cathode of the first diode is also connected to the negative power supply terminal, and the anode of the first diode is also respectively connected to the second end of the first fuse and the first load terminal.

[0008] The above-mentioned fuse alarm circuit, through the light-emitting diode inside the first optical coupler is turned on and emits light when the first fuse is disconnected, so that the photosensitive transistor inside the first optical coupler is also turned on, and finally the potential of the first branch alarm output end connected to the emitter of the first optical coupler is changed, so as to realize the alarm after the first fuse is disconnected, and the first fuse is electrically isolated from the first branch alarm output end. Thereby, the stability of the fuse alarm circuit is improved, and the accuracy of the fuse alarm circuit in alarming the disconnection of the fuse is correspondingly improved.

[0009] In combination with the first aspect, optionally, the cathode of the first optocoupler is connected to the negative power supply terminal through a first resistor; and the cathode of the first diode is connected to the negative power supply terminal through the first resistor.

[0010] The fuse alarm circuit is provided with a first resistor on the branch between the cathode of the first optocoupler and the negative power supply terminal to limit the current of the branch. The current flowing through the first optocoupler is reduced on the basis of the voltage output by the first load terminal, thereby better balancing the voltage between the first optocoupler and the load terminal.

[0011] In combination with the first aspect, optionally, the first alarm branch further includes a first light emitting diode; an anode of the first light emitting diode is connected to the positive power supply terminal, and a cathode of the first light emitting diode is connected to the negative power supply terminal.

[0012] The fuse alarm circuit forms a power indication by connecting the first light emitting diode between the positive power supply terminal and the negative power supply terminal, thereby also indicating whether the fuse alarm circuit is working or not, thereby improving the convenience of using the fuse alarm circuit.

[0013] In combination with the first aspect, optionally, the first alarm branch further includes a second resistor; and the cathode of the first light-emitting diode is connected to the negative power supply terminal through the second resistor.

[0014] The fuse alarm circuit is provided with a second resistor on the branch where the first light emitting diode is located, so as to limit the current of the branch. It also ensures that the current flowing through the first light emitting diode is reduced on the basis of the voltage output by the first load end, thereby better balancing the voltage between the first light emitting diode and the load end.

[0015] In combination with the first aspect, optionally, the first alarm branch also includes a first alarm indicating element and a third resistor; the first end of the first alarm indicating element is connected to the first end of the third resistor, and the second end of the first alarm indicating element is connected to the emitter of the first optocoupler; the second end of the third resistor is respectively connected to the negative power supply terminal and the cathode of the first diode.

[0016] The above-mentioned fuse alarm circuit sends out an alarm indication signal through the first alarm indication element when the first fuse is disconnected. On the basis of the alarm signal output by the first branch alarm output end, an additional alarm indication signal is output. The first branch alarm output end can be used to output the alarm indication signal remotely, such as in a monitoring room. The first alarm indication element can be used to output the alarm indication signal on-site, and can be used to indicate the specific location of the first fuse to the staff, so that the staff can replace the first fuse conveniently. Thereby, the use convenience of the fuse alarm circuit is further improved.

[0017] In combination with the first aspect, optionally, the first alarm indicating element includes a first light signal indicating element.

[0018] The fuse alarm circuit adopts the first optical signal indicating element as the first alarm indicating element. Compared with the sounding element or the vibration element, the influence on the surrounding environment of the first fuse is reduced and the clarity of the instructions to the workers is improved.

[0019] In combination with the first aspect, optionally, the first optical signal indicating element includes a second light emitting diode; the first end of the first alarm indicating element is the cathode of the second light emitting diode, and the second end of the first alarm indicating element is the anode of the second light emitting diode.

[0020] The fuse alarm circuit adopts the second light-emitting diode as the first light signal indicating element. Compared with other light-emitting elements of the light bulb, the second light-emitting diode has a longer life and lower energy consumption. Therefore, the operating stability of the fuse alarm circuit is improved and the energy consumption of the fuse alarm circuit is reduced.

[0021] In combination with the first aspect, optionally, the circuit also includes a second alarm branch and a total alarm output terminal; the second alarm branch includes a second optocoupler, a second load terminal, a second fuse, a third diode, a fourth diode and a second branch alarm output terminal; the emitter of the second optocoupler is connected to the second branch alarm output terminal, the collector of the second optocoupler is connected to the positive power supply terminal, the cathode of the second optocoupler is respectively connected to the cathode of the third diode and the negative power supply terminal, and the anode of the second optocoupler is connected to the cathode of the fourth diode; the positive power supply terminal is also respectively connected to the first end of the second fuse and the anode of the fourth diode; the cathode of the third diode is also connected to the negative power supply terminal, and the anode of the third diode is also respectively connected to the second end of the second fuse and the second load terminal; the total alarm output terminal is respectively connected to the emitter of the first optocoupler and the emitter of the second optocoupler.

[0022] The fuse alarm circuit can monitor multiple fuses at the same time by configuring a second alarm branch, or even a third alarm branch, a fourth alarm branch, and a fifth alarm branch, etc., which have the same structure as the first alarm branch in the fuse alarm circuit. In addition, when the fuse is disconnected, the alarm branch and the position of the fuse can be determined, which makes it convenient for the staff to replace the fuse. The convenience of using the fuse alarm circuit is further improved.

[0023] In combination with the first aspect, optionally, the first alarm branch also includes a first main circuit diode, and the second alarm branch also includes a second main circuit diode; the anode of the first main circuit diode is connected to the emitter of the first optocoupler, and the cathode of the first main circuit diode is connected to the total alarm output terminal; the anode of the second main circuit diode is connected to the emitter of the second optocoupler, and the cathode of the second main circuit diode is connected to the total alarm output terminal.

[0024] The above-mentioned fuse alarm circuit configures a total alarm output end in the fuse alarm circuit, and the total alarm output end is connected to the first alarm branch and the second alarm branch respectively, so that when any fuse (the first fuse or the second fuse) in the fuse alarm circuit is disconnected, the total alarm output end will output an alarm signal, thereby realizing another level of monitoring of the fuse status, further improving the convenience of use of the fuse alarm circuit and the accuracy of alarming for fuse disconnection.

[0025] In a second aspect, the present application provides a fuse alarm device, comprising the fuse alarm circuit described in the first aspect.

[0026] The above-mentioned fuse alarm device has the same beneficial effects as the fuse alarm circuit described in the first aspect, and will not be described in detail here.

[0027] In summary, the fuse alarm circuit and device provided by each embodiment of the present application monitor the fuse through an optical coupler, thereby improving the stability of the fuse alarm circuit, and correspondingly improving the accuracy of the fuse alarm circuit in alarming the disconnection of the fuse. By connecting the first light-emitting diode between the positive power supply terminal and the negative power supply terminal, a power supply indication is formed. Thus, an indication is also formed on whether the fuse alarm circuit is working or not, which improves the convenience of use of the fuse alarm circuit. By sending an alarm indication signal through the first alarm indication element when the first fuse is disconnected, an additional alarm indication signal is output, further improving the convenience of use of the fuse alarm circuit. By configuring a second alarm branch with the same structure as the first alarm branch in the fuse alarm circuit, or even a third alarm branch, a fourth alarm branch, and a fifth alarm branch, etc., it is realized to monitor multiple fuses at the same time, and when the fuse is disconnected, the alarm branch and position to which the fuse belongs can be correspondingly determined, which facilitates the staff to replace the fuse. The convenience of use of the fuse alarm circuit is further improved. By configuring the total alarm output terminal in the fuse alarm circuit, another level of monitoring of the fuse status is achieved, further improving the convenience of using the fuse alarm circuit and the accuracy of alarming for fuse disconnection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A first circuit diagram of a fuse alarm circuit provided in an embodiment of the present application;

[0030] Figure 2 A second circuit diagram of the fuse alarm circuit provided in an embodiment of the present application;

[0031] Figure 3 A third circuit diagram of the fuse alarm circuit provided in the embodiment of the present application;

[0032] Figure 4 A fourth circuit diagram of the fuse alarm circuit provided in the embodiment of the present application;

[0033] Figure 5 A fifth circuit diagram of the fuse alarm circuit provided in the embodiment of the present application;

[0034] Figure 6 A sixth circuit diagram of the fuse alarm circuit provided in the embodiment of the present application;

[0035] Figure 7 This is a schematic diagram of the structure of a fuse alarm device provided in an embodiment of the present application.

[0036] Icon: 100, fuse alarm circuit; P, positive power supply terminal; N, negative power supply terminal; 110, first alarm branch; U 1 , the first optical coupler; L 1 , the first load end; F 1 , the first fuse; D 1 , the first diode; D 2 , the second diode; A 1 , the first branch alarm output terminal; R 1 , the first resistor; R 2 , the second resistor; R 3 , the third resistor; LED 1 , a first light emitting diode; S 1 , the first alarm indicator element; LED 2 , the second light emitting diode; D 总1 , the first main circuit diode; 120, the second alarm branch; U 2 , the second optocoupler; L 2 , the second load end; F 2 , the second fuse; D 3 , the third diode; D 4 , the fourth diode; A 2 , the second branch alarm output terminal; R 4 , the fourth resistor; R 5 , the fifth resistor; R 6 , the sixth resistor; S 2 , Second alarm indicator element; LED 3 , the third light emitting diode; LED 4 , the fourth light emitting diode; D 总2 , the second main circuit diode; A, the main alarm output terminal; 10, the fuse alarm device; 200, the PCB board. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] Please refer to Figure 1 , Figure 1 1 is a first circuit diagram of the fuse alarm circuit 100 provided in the embodiment of the present application. The fuse alarm circuit 100 provided in the embodiment of the present application may include a positive power supply terminal P, a negative power supply terminal N and a first alarm branch 110. The first alarm branch 110 may include a first optical coupler U 1 , the first load terminal L 1 、First fuse F 1 , the first diode D 1, the second diode D 2 And the first branch alarm output terminal A 1 The first optocoupler U 1 The emitter of the first branch alarm output terminal A 1 Connect the first optocoupler U 1 The collector of the first optocoupler U 1 The cathode of the first diode D 1 The cathode of the first optocoupler U is connected to the negative power supply terminal N. 1 The anode of the second diode D 2 The positive power supply terminal P can also be connected to the first fuse F 1 The first end of the second diode D 2 The anode of the first diode D 1 The cathode of the first diode D can also be connected to the negative power supply terminal N. 1 The anode of the first fuse F 1 The second end and the first load end L 1 connect.

[0044] The positive power supply terminal P and the negative power supply terminal N can be used as the power input terminal of the entire fuse alarm circuit 100, and the input voltage can be 24V. 1 It usually contains a light-emitting diode and a phototransistor. When the light-emitting diode is turned on, the light it emits will turn on the collector and emitter of the phototransistor.

[0045] In the fuse alarm circuit 100 provided in the embodiment of the present application, the first fuse F 1 When it is not disconnected, it is equivalent to a wire. The current flows from the positive power supply terminal P through the fuse to the first load terminal L 1 . And, it is equivalent to the first fuse F of the wire 1 The first optocoupler U 1 The internal light emitting diode branch is short-circuited, so that the first optocoupler U 1 The internal phototransistor cannot be turned on. In this case, the first branch alarm output terminal A 1 The potential is usually 0.

[0046] In the first fuse F 1 When disconnected, the current flows from the positive power supply terminal P through the second diode D 2 Flow to the first optocoupler U 1 The current flows from the cathode of the light-emitting diode to the negative power supply terminal N, thus forming a current loop. 1The internal light emitting diode is turned on and emits light, so that the first optical coupler U 1 The collector and emitter of the internal photosensitive triode are also turned on. In this case, the current also flows from the positive power supply terminal P, through the positive power supply terminal P and the first optical coupler U 1 The branch between the collectors flows to the first optocoupler U 1 The collector of the first optocoupler U 1 When the phototransistor is turned on, the current flows to the first optocoupler U 1 The emitter of the first branch finally flows to the alarm output terminal A. 1 In this case, the first branch alarm output terminal A 1 The potential is usually greater than 0.

[0047] It can be seen that whether the fuse is disconnected corresponds to the first branch alarm output terminal A 1 Different potentials. So according to the first branch alarm output terminal A 1 The potential of the fuse can be monitored.

[0048] In the above implementation process, the first optical coupler U 1 The internal light emitting diode is in the first fuse F 1 When the first optical coupler U 1 The internal phototransistor is also turned on, and finally the first optical coupler U 1 The emitter is connected to the first branch alarm output terminal A 1 The potential of the first fuse F 1 After the alarm is disconnected, the first fuse F 1 With the first branch alarm output terminal A 1 Thereby, the stability of the fuse alarm circuit 100 is improved, and accordingly, the accuracy of the fuse alarm circuit 100 in alarming when the fuse is disconnected is improved.

[0049] Please refer to Figure 2 , Figure 2 1 is a second circuit diagram of the fuse alarm circuit 100 provided in the embodiment of the present application. 1 The cathode can be connected through the first resistor R 1 Connected to the negative power supply terminal N. The first diode D 1 The cathode can be connected through the first resistor R 1 Connected to the negative power supply terminal N.

[0050] That is, the first resistor R 1 One end of the first optical coupler U 1 The first resistor R1 The resistance value can be 5kΩ, 5.1kΩ, 6kΩ, etc.

[0051] In the above implementation process, by using the first optical coupler U 1 A first resistor R is provided on the branch between the cathode and the negative power supply terminal N. 1 , to limit the current of the branch. Ensure that the first load terminal L 1 Based on the output voltage, the current flowing through the first optocoupler U 1 The current of the first optocoupler U 1 Voltage between the load terminal.

[0052] Please refer to Figure 3 , Figure 3 This is a third circuit diagram of the fuse alarm circuit 100 provided in the embodiment of the present application. In some optional implementations, the first alarm branch 110 may also include a first light emitting diode LED 1 The first light emitting diode LED 1 The anode of the first light emitting diode LED can be connected to the positive power supply terminal P. 1 The cathode of can be connected to the negative power supply terminal N.

[0053] After the positive power supply terminal P and the negative power supply terminal N are powered on, the first light emitting diode LED 1 It turns on and emits light, thus forming a power indication.

[0054] In the above implementation process, a first light emitting diode LED is connected between the positive power supply terminal P and the negative power supply terminal N. 1 Thus, it also indicates whether the fuse alarm circuit 100 is working or not, thereby improving the convenience of using the fuse alarm circuit 100.

[0055] Please refer to Figure 4 , Figure 4 1 is a fourth circuit diagram of the fuse alarm circuit 100 provided in the embodiment of the present application. In some optional implementations, the first alarm branch 110 may further include a second resistor R 2 The first light emitting diode LED 1 The cathode can be connected through the second resistor R 2 Connected to the negative power supply terminal N.

[0056] That is, the second resistor R 2 One end can be connected to the first light emitting diode LED 1 The other end can be connected to the negative power supply terminal N. The second resistor R 2 The resistance value can also be 5kΩ, 5.1kΩ, 6kΩ, etc.

[0057] In the above implementation process, by firstly 1 A second resistor R is set on the branch where 2 , to limit the current of the branch. It also ensures that the first load terminal L 1 Based on the output voltage, the current flowing through the first light emitting diode LED is reduced 1 The current of the first light emitting diode LED is better balanced. 1 Voltage between the load terminal.

[0058] Please refer to Figure 5 , Figure 5 is a fifth circuit diagram of the fuse alarm circuit 100 provided in the embodiment of the present application. In some optional implementations, the first alarm branch 110 may also include a first alarm indicating element S 1 And the third resistor R 3 . The first alarm indicator element S 1 The first end can be connected to the third resistor R 3 The first end of the first alarm indicator element S 1 The second end of the first optical coupler U 1 The third resistor R 3 The second end can be connected to the negative power supply terminal N and the first diode D 1 cathode connection.

[0059] In the above embodiment, the first fuse F 1 When disconnected, the first optocoupler U 1 The collector and emitter of the internal phototransistor are turned on, and current flows to the first optocoupler U 1 The emitter of the first branch finally flows to the alarm output terminal A. 1 In addition, the current will also flow from the first optocoupler U 1 The emitter of the first alarm indicator element S 1 , the third resistor R 3 , and finally flows to the negative power supply terminal N, forming a current loop. That is, in the first fuse F 1 When disconnected, the first alarm indicator element S 1 It works under the action of electric current and sends out an alarm indication signal.

[0060] Accordingly, in the first fuse F 1 If it is not disconnected, the first alarm indicator element S 1 The current branch where it is located is also short-circuited, so that no current flows through the first alarm indicator element S 1 .

[0061] Among them, the first alarm indicator element S1 It can be a light-emitting element, a sound-emitting element, or a vibration element, etc. For example: a light bulb, a buzzer, a linear resonator, etc.

[0062] In the above implementation process, the first alarm indicating element S 1 In the first fuse F 1 In case of disconnection, an alarm indication signal is issued at the first branch alarm output terminal A 1 On the basis of outputting the alarm signal, an additional alarm indication signal is output. 1 It can be used to output alarm indication signals remotely, such as in a monitoring room. 1 It can be used as an on-site output alarm indication signal to indicate to the staff that the first fuse F 1 The specific location of the fuse F is convenient for the staff to replace the first fuse 1 Therefore, the usability of the fuse alarm circuit 100 is further improved.

[0063] Please continue to refer to Figure 5 In some optional embodiments, the first alarm indicator element S 1 A first light signal indicating element may be included.

[0064] That is to say, the first alarm indicator element S 1 It can be a light bulb, a light emitting diode or the like.

[0065] In the above implementation process, the first light signal indicating element is specifically used as the first alarm indicating element S 1 Compared with the sound element or the vibration element, the first fuse F is reduced 1 In addition to the influence of the surrounding environment, it also improves the clarity of instructions to workers.

[0066] Please continue to refer to Figure 5 In some optional embodiments, the first optical signal indicating element may include a second light emitting diode LED 2 . The first alarm indicator element S 1 The first end can be a second light emitting diode LED 2 The cathode of the first alarm indicator element S 1 The second end can be a second light emitting diode LED 2 anode.

[0067] In the above implementation process, by using the second light-emitting diode as the first light signal indicating element, the second light-emitting diode has a longer life and lower energy consumption than other light-emitting elements of the light bulb, thereby improving the operating stability of the fuse alarm circuit 100 and reducing the energy consumption of the fuse alarm circuit 100.

[0068] Please refer to Figure 6 , Figure 6 1 is a sixth circuit diagram of the fuse alarm circuit 100 provided in the embodiment of the present application. In some optional implementations, the fuse alarm circuit 100 provided in the embodiment of the present application may further include a second alarm branch 120 and a general alarm output terminal A. The second alarm branch 120 may include a second optical coupler U 2 , the second load terminal L 2 , Second fuse F 2 , the third diode D 3 , the fourth diode D 4 And the second branch alarm output terminal A 2 The second optocoupler U 2 The emitter of the second branch alarm output terminal A 2 Connect the second optocoupler U 2 The collector of can be connected to the positive power supply terminal P, and the second optocoupler U 2 The cathode of the third diode D 3 The cathode of the second optocoupler U is connected to the negative power supply terminal N. 2 The anode of the fourth diode D 4 The positive power supply terminal P can also be connected to the second fuse F 2 The first end of the fourth diode D 4 The anode of the third diode D 3 The cathode of the third diode D 3 The anode of the second fuse F 2 The second end and the second load end L 2 The general alarm output terminal A can be connected to the first optical coupler U 1 The emitter of the second optocoupler U 2 The emitter connection of

[0069] That is to say, the circuit structure of the second alarm branch 120 may be the same as that of the first alarm branch 110. Moreover, based on the above-mentioned embodiment, the second alarm branch 120 may also correspond to the first alarm branch 110, in which the second optical coupler U 2 A fourth resistor R is provided between the cathode of 4 . In the second optocoupler U 2A second alarm indicating element S is provided between the emitter and the negative power supply terminal N. 2 And the fifth resistor R 5 . In the second optocoupler U 2 A second alarm indicating element S is provided between the emitter and the negative power supply terminal N. 2 , that is, the third light emitting diode LED 3 The fourth diode D 4 A sixth resistor R is provided between the anode and the negative power supply terminal N 6 and a fourth light emitting diode LED 4 .

[0070] It should be understood that those skilled in the art may also set a third alarm branch, a fourth alarm branch, and a fifth alarm branch, etc., according to the number of fuses. The circuit structures of the third alarm branch, the fourth alarm branch, and the fifth alarm branch, etc. may be the same as the first alarm branch 110.

[0071] In the above implementation process, by configuring the second alarm branch 120, or even the third alarm branch, the fourth alarm branch, and the fifth alarm branch, etc., which have the same structure as the first alarm branch 110 in the fuse alarm circuit 100, it is possible to monitor multiple fuses simultaneously, and when the fuse is disconnected, the alarm branch and position to which the fuse belongs can be correspondingly determined, which facilitates the staff to replace the fuse. The convenience of use of the fuse alarm circuit 100 is further improved.

[0072] Please continue to refer to Figure 6 In some optional embodiments, the first alarm branch 110 may further include a first main circuit diode D 总1 The second alarm branch 120 may also include a second main circuit diode D 总2 The first main circuit diode D 总1 The anode of the first optocoupler U 1 The emitter of the first diode D 总1 The cathode of can be connected to the main alarm output terminal A. The second main circuit diode D 总2 The anode of the second optocoupler U 2 The emitter of the second diode D 总2 The cathode of can be connected to the general alarm output terminal A.

[0073] Combined with the first branch alarm output terminal A described in the previous embodiment 1 The working principle is that, accordingly, in the first fuse F 1 When disconnected, the potential of the main alarm output terminal A is usually greater than 0. Similarly, when the second fuse F 2In the case of disconnection, the potential of the total alarm output terminal A is usually greater than 0. That is to say, in the case of a fuse disconnection in any of the first alarm branch 110, the second alarm branch 120, or even the third alarm branch, the fourth alarm branch, and the fifth alarm branch, the potential of the total alarm output terminal A is usually greater than 0, thereby realizing the output of the alarm signal.

[0074] In the above implementation process, by configuring a general alarm output terminal A in the fuse alarm circuit 100, the general alarm output terminal A is connected to the first alarm branch 110 and the second alarm branch 120 respectively, so that any fuse (the first fuse F 1 , Second fuse F 2 ) is disconnected, the main alarm output terminal A will output an alarm signal, thereby realizing another level of monitoring of the fuse status, further improving the convenience of use of the fuse alarm circuit 100 and the accuracy of the alarm for fuse disconnection.

[0075] Please refer to Figure 7 , Figure 7 1 is a schematic diagram of the structure of a fuse alarm device 10 provided in an embodiment of the present application. Based on the same concept, an embodiment of the present application provides a fuse alarm device 10, which may include the fuse alarm circuit 100 described above.

[0076] The fuse alarm device 10 may include a PCB board 200 , and various components in the fuse alarm circuit 100 may be arranged on the PCB board 200 .

[0077] The above implementation process can have the same beneficial effects as the fuse alarm circuit 100 described above, and will not be described in detail here.

[0078] In summary, the fuse alarm circuit 100 and the device provided in each embodiment of the present application monitor the fuse through an optical coupler, thereby improving the stability of the fuse alarm circuit 100, and correspondingly improving the accuracy of the fuse alarm circuit 100 in alarming the fuse disconnection. 1 , forming a power indication. This also forms an indication of whether the fuse alarm circuit 100 is working or not, improving the convenience of using the fuse alarm circuit 100. 1 In the first fuse F 1In the case of disconnection, an alarm indication signal is issued, and an additional alarm indication signal is output, which further improves the convenience of use of the fuse alarm circuit 100. By configuring the second alarm branch 120 with the same structure as the first alarm branch 110 in the fuse alarm circuit 100, or even the third alarm branch, the fourth alarm branch and the fifth alarm branch, etc., it is realized to monitor multiple fuses at the same time, and in the case of a fuse disconnection, the alarm branch and position to which the fuse belongs can be correspondingly determined, which is convenient for the staff to replace the fuse. The convenience of use of the fuse alarm circuit 100 is further improved. By configuring the total alarm output terminal A in the fuse alarm circuit 100, another level of monitoring of the fuse status is achieved, which further improves the convenience of use of the fuse alarm circuit 100 and the accuracy of alarming when the fuse is disconnected.

[0079] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fuse alarm circuit, characterized in that: It includes a positive power supply terminal, a negative power supply terminal and a first alarm branch; The first alarm branch includes a first optical coupler, a first load end, a first fuse, a first diode, a second diode and a first branch alarm output end; The emitter of the first optical coupler is connected to the first branch alarm output terminal, the collector of the first optical coupler is connected to the positive power supply terminal, the cathode of the first optical coupler is respectively connected to the cathode of the first diode and the negative power supply terminal, and the anode of the first optical coupler is connected to the cathode of the second diode; The positive power supply terminal is also connected to the first end of the first fuse and the anode of the second diode respectively; The cathode of the first diode is also connected to the negative power supply terminal, and the anode of the first diode is also connected to the second end of the first fuse and the first load end respectively.

2. The fuse alarm circuit according to claim 1, characterized in that: The cathode of the first optical coupler is connected to the negative power supply terminal through a first resistor; The cathode of the first diode is connected to the negative power supply terminal through the first resistor.

3. The fuse alarm circuit according to claim 1, characterized in that: The first alarm branch also includes a first light emitting diode; The anode of the first light emitting diode is connected to the positive power supply terminal, and the cathode of the first light emitting diode is connected to the negative power supply terminal.

4. The fuse alarm circuit according to claim 3, characterized in that: The first alarm branch also includes a second resistor; The cathode of the first light emitting diode is connected to the negative power supply terminal through the second resistor.

5. The fuse alarm circuit according to claim 1, characterized in that: The first alarm branch also includes a first alarm indicating element and a third resistor; The first end of the first alarm indicating element is connected to the first end of the third resistor, and the second end of the first alarm indicating element is connected to the emitter of the first optical coupler; The second end of the third resistor is connected to the negative power supply end and the cathode of the first diode respectively.

6. The fuse alarm circuit according to claim 5, characterized in that: in, The first alarm indicating element comprises a first light signal indicating element.

7. The fuse alarm circuit according to claim 6, characterized in that: in, The first optical signal indicating element comprises a second light emitting diode; The first end of the first alarm indicating element is the cathode of the second light emitting diode, and the second end of the first alarm indicating element is the anode of the second light emitting diode.

8. The fuse alarm circuit according to claim 1, characterized in that: The circuit also includes a second alarm branch and a total alarm output terminal; The second alarm branch includes a second optical coupler, a second load end, a second fuse, a third diode, a fourth diode and a second branch alarm output end; The emitter of the second optical coupler is connected to the second branch alarm output terminal, the collector of the second optical coupler is connected to the positive power supply terminal, the cathode of the second optical coupler is respectively connected to the cathode of the third diode and the negative power supply terminal, and the anode of the second optical coupler is connected to the cathode of the fourth diode; The positive power supply terminal is also connected to the first end of the second fuse and the anode of the fourth diode respectively; The cathode of the third diode is also connected to the negative power supply terminal, and the anode of the third diode is also connected to the second end of the second fuse and the second load end respectively; The general alarm output terminal is connected to the emitter of the first optical coupler and the emitter of the second optical coupler respectively.

9. The fuse alarm circuit according to claim 8, characterized in that: The first alarm branch further includes a first main circuit diode, and the second alarm branch further includes a second main circuit diode; The anode of the first main-path diode is connected to the emitter of the first optical coupler, and the cathode of the first main-path diode is connected to the main alarm output terminal; The anode of the second main-path diode is connected to the emitter of the second optical coupler, and the cathode of the second main-path diode is connected to the main alarm output terminal.

10. A fuse alarm device, characterized in that: The invention comprises the fuse alarm circuit as claimed in any one of claims 1 to 9.

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