Emergency power supply with intrinsic safety output

Abstract

The utility model discloses an emergency power supply with intrinsically safe output, the key points of the technical scheme are that the emergency power supply comprises an intrinsically safe power supply circuit, the intrinsically safe power supply circuit comprises an input end, an anti-surge unit and an EMI filtering unit, the anti-surge unit is connected with the input end, and the EMI filtering unit is connected with the anti-surge unit; the input end comprises a positive electrode end and a negative electrode end; the anti-surge unit comprises a piezoresistor VR2 and a protective tube F2, one end of the protective tube F2 is connected with the positive electrode end, and the other end of the protective tube F2 is connected with the first end of the piezoresistor VR2; according to the emergency power supply, energy generated under the normal working or fault condition is not enough to ignite the critical condition of explosive gas, so that the emergency power supply has higher safety.

Description

Technical Field

[0001] The utility model relates to an emergency power supply, more specifically, it relates to an emergency power supply with intrinsically safe output. Background Art

[0002] With the rapid development of industries such as mining and petroleum, explosion-proof devices are increasingly used in production and rescue, with more and more varieties and functions. How to prevent accidental explosions in an environment full of explosive gases has also become an important topic. Since electrical appliances generate sparks when working, once they come into contact with explosive gases in the production environment, they will cause large-scale explosion accidents, thereby endangering the lives and safety of workers and national property.

[0003] Inflammable and explosive places containing gas, dust and other flammable gases must use intrinsically safe lamps. The existing intrinsically safe power supplies do not have emergency lighting functions, which seriously affects the application process of LED lighting systems in coal mines. The dark environment after a sudden power outage will produce a heavy sense of depression for the workers who are working, and is not conducive to evacuation. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present utility model is to provide an emergency power supply with intrinsically safe output, which generates energy that is insufficient to meet the critical condition of igniting explosive gas under normal working or fault conditions, and has higher safety.

[0005] To achieve the above object, the utility model provides the following technical solutions: an emergency power supply with intrinsically safe output, comprising an intrinsically safe power supply circuit, wherein the intrinsically safe power supply circuit comprises an input terminal, a surge protection unit and an EMI filter unit, wherein the surge protection unit is connected to the input terminal, and the EMI filter unit is connected to the surge protection unit;

[0006] The input end includes a positive terminal and a negative terminal;

[0007] The surge protection unit includes a varistor VR2 and a fuse F2, one end of the fuse F2 is connected to the positive terminal, and the other end is connected to the first end of the varistor VR2;

[0008] The second end of the varistor VR2 is connected to the negative terminal.

[0009] In summary, the utility model has the following beneficial effects: 1. An anti-surge unit and an EMI filter unit are added at the access end of the emergency power supply and the mains power. The circuit first connects a varistor VR2 in parallel on the AC input side and a fuse F2 in series to prevent voltage shocks underground or excessive current caused by other reasons, thereby forming a primary AC-DC voltage conversion.

[0010] 2. When the mains power is normal, the emergency power system will manage the battery charging through the built-in charger to ensure sufficient energy supply when needed. Once the main power is interrupted, the inverter of the emergency power system will start, and the DC power in the battery will be boosted to supply the intrinsically safe power supply to realize the emergency function. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the first part of the principle diagram of the intrinsically safe power supply circuit;

[0012] Figure 2 This is the second part of the principle diagram of the intrinsically safe power supply circuit;

[0013] Figure 3 This is the third part of the principle diagram of the intrinsically safe power supply circuit;

[0014] Figure 4 This is the schematic diagram of the first part of the inverter emergency circuit;

[0015] Figure 5 This is the schematic diagram of the second part of the inverter emergency circuit.

[0016] Figure numerals: 1. Input end; 2. Surge protection unit; 21. Varistor VR2; 22. Fuse F2; 3. EMI filter unit; 31. Capacitor C24; 32. Inductor L2; 33. Capacitor C25; 4. Capacitor CX2; 5. Isolator T2; 6. Inverter emergency circuit. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0018] Reference Figures 1 to 5 As shown, in order to achieve the above purpose, the utility model provides the following technical solutions: an emergency power supply with intrinsically safe output, including an intrinsically safe power supply circuit, the intrinsically safe power supply circuit includes an input end, an anti-surge unit and an EMI filter unit, the anti-surge unit is connected to the input end, and the EMI filter unit is connected to the anti-surge unit;

[0019] The input terminal includes a positive terminal and a negative terminal;

[0020] The surge protection unit includes a varistor VR2 and a fuse F2, one end of the fuse F2 is connected to the positive terminal, and the other end is connected to the first end of the varistor VR2;

[0021] The second end of the varistor VR2 is connected to the negative terminal.

[0022] The design of the utility model adds a surge protection unit and an EMI filter unit at the access end of the emergency power supply and the mains power. The circuit first connects a varistor VR2 in parallel and a fuse F2 in series on the AC input side to prevent voltage shock underground or excessive current caused by other reasons, thereby forming a primary AC-DC voltage conversion.

[0023] The EMI filter unit includes a capacitor C24, an inductor L2 and a capacitor C25. The capacitor C24 is connected to the input end. One end of the inductor L2 is connected to the capacitor C24 and the other end is connected to the first end of the capacitor C25. The second end of the capacitor C25 is grounded.

[0024] like Figure 1 As shown, the design of the EMI filter unit can process the noise that may appear in the circuit and reduce interference.

[0025] A capacitor CX2 is also included. The capacitor CX2 is connected in parallel between the varistor VR2 and the positive terminal and the negative terminal.

[0026] An isolation element T2 is provided in parallel between the capacitor C24 and the input terminal.

[0027] Further, combined with Figure 1 and Figure 2 as well as Figure 3 As shown, it can process the current input from the mains, convert the AC127V voltage into DC20V voltage, and then output it to the LED light source after two-level protection and double overvoltage and overcurrent protection, ensuring the stability of operation. The energy generated by this intrinsically safe power supply under normal working or fault conditions is not enough to meet the critical condition of igniting explosive gas, and it has higher safety.

[0028] Specific as Figure 2 As shown, after the overcurrent signal 1 and the overcurrent signal 2 enter from the input end respectively, after a series of subsequent operations, the output port outputs a stable current and voltage of 900mA and 20V, which improves the safety of product use. Since this processing part is a conventional technical means and its implementation method is not unique, it will not be described here. Figure 2 As an example, having the same or similar means should be an equivalent solution of this embodiment, and according to Figures 1 to 3 As shown, those skilled in the art can implement the implementation of the intrinsically safe circuit.

[0029] The intrinsically safe power supply circuit is connected with an inverter emergency circuit, and the inverter emergency circuit is used for storing and feeding back current.

[0030] The design of the inverter emergency circuit has the following technical effects: when the mains power is normal, the emergency power system will manage the battery charging through the built-in charger to ensure sufficient energy supply when needed. Once the main power is interrupted, the inverter of the emergency power system will start, and the DC power in the battery will be boosted to supply the intrinsically safe power supply to realize the emergency function.

[0031] The inverter emergency circuit includes a discharge unit, a charging unit and a battery.

[0032] like Figure 4 and Figure 5 As shown, the specific implementation methods of the discharge unit, the charging unit and the battery can correspond respectively. By utilizing the chips Viper22s and SG3525A and multiple transistors and diodes, when the mains power changes, high and low levels are output to the corresponding positions of the circuit, thereby switching between charging and discharging.

[0033] In addition, for example, in the corresponding document CN202309199U, an emergency circuit similar to the principle is used. Although the circuit itself is different, the principle is similar. Those skilled in the art can Figure 4 and Figure 5 The provided circuit diagram can realize the implementation method of the emergency circuit.

[0034] Those skilled in the art will Figure 4 and Figure 5 As shown, the technical effect of the above-mentioned inverter emergency circuit can be achieved. In addition, those skilled in the art can also use the existing inverter for the power supply circuit.

[0035] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. An emergency power supply with intrinsically safe output, characterized by: The invention comprises an intrinsically safe power supply circuit, wherein the intrinsically safe power supply circuit comprises an input end (1), a surge protection unit (2) and an EMI filter unit (3), wherein the surge protection unit (2) is connected to the input end (1), and the EMI filter unit (3) is connected to the surge protection unit (2); The input end (1) comprises a positive terminal and a negative terminal; The surge protection unit (2) comprises a varistor VR2 (21) and a fuse F2 (22), one end of the fuse F2 (22) is connected to the positive terminal, and the other end is connected to the first end of the varistor VR2 (21); The second end of the varistor VR2 (21) is connected to the negative terminal.

2. The emergency power supply with intrinsically safe output according to claim 1 is characterized in that: The EMI filter unit (3) comprises a capacitor C24 (31), an inductor L2 (32) and a capacitor C25 (33); the capacitor C24 (31) is connected to the input terminal (1); one end of the inductor L2 is connected to the capacitor C24 (31), and the other end is connected to the first end of the capacitor C25 (33); the second end of the capacitor C25 (33) is grounded.

3. The emergency power supply with intrinsically safe output according to claim 2 is characterized in that: The device also includes a capacitor CX2 (4), which is connected in parallel between the varistor VR2 (21) and the positive terminal and the negative terminal.

4. The emergency power supply with intrinsically safe output according to claim 2 is characterized in that: An isolation element T2 (5) is arranged in parallel between the capacitor C24 (31) and the input terminal (1).

5. An emergency power supply with intrinsically safe output according to any one of claims 1 to 4, characterized in that: The intrinsically safe power supply circuit is connected to an inverter emergency circuit (6), and the inverter emergency circuit (6) is used to store and feed back current.

6. The emergency power supply with intrinsically safe output according to claim 5 is characterized in that: The inverter emergency circuit (6) comprises a discharge unit, a charging unit and a storage battery.

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