Impact current suppression circuit of mining intrinsically safe power supply and suppression method thereof

Abstract

The invention discloses an impact current suppression circuit of a mining intrinsically safe power supply and a suppression method thereof, and the impact current suppression circuit comprises a voltage output module which is used for outputting a 2.5 V reference voltage and a power supply voltage VCC; the current detection module is used for detecting the magnitude of impact current; the comparison module is used for comparing a voltage Vtest generated by the impulse current with a reference voltage Vref, and when the Vtest is smaller than the Vref, the suppression module does not play a suppression role; and when the Vtest is greater than the Vref, the suppression module suppresses the impact current from entering the mining intrinsically safe power supply. The impact current suppression circuit is arranged between the mining intrinsically safe power supply and the load equipment, so that the impact current can be effectively suppressed, the current response rate of the mining intrinsically safe power supply does not need to be adjusted, and only a small energy storage capacitor needs to be arranged on the power supply input side of the intrinsically safe equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of mine power supplies, and in particular to an impact current suppression circuit and a suppression method of an intrinsically safe mine power supply. Background Art

[0002] An intrinsically safe power supply for mining is one whose maximum output voltage and current demonstrate intrinsic safety performance under both normal operation and fault conditions. This performance means that any sparks or thermal effects generated by the intrinsically safe power supply circuit under the conditions specified in the standard cannot ignite the specified explosive gas environment.

[0003] When intrinsically safe equipment is powered on and operating, it is prone to inrush currents. These inrush currents are characterized by short duration and high peak currents. If the inrush current exceeds the protection level of the intrinsically safe power supply, the power supply will temporarily adjust its output circuit. After the output circuit is cut off, the power supply will not immediately recover, but will wait for a certain period of time before resuming output. If the intrinsically safe equipment does not have a certain power-off recovery capability, it will cause itself to restart, affecting normal production in the coal mine.

[0004] Currently, there are two main approaches to suppressing the startup and operating inrush current of intrinsically safe equipment:

[0005] 1. The principle of processing on the intrinsically safe power supply circuit of the mine is to slow down the reaction rate of the intrinsically safe power supply of the mine, so that it will not respond to the surge current within a certain period of time. However, the disadvantage is that it slows down the reaction speed of the intrinsically safe power supply of the mine to the current, thereby reducing the ability of the intrinsically safe power supply of the mine to suppress spark energy.

[0006] 2. Processing is performed on the power input side of the intrinsically safe equipment. The principle is to add a certain amount of energy storage capacitors to the power input side of the intrinsically safe equipment. When the surge current causes the intrinsically safe power supply for mining to temporarily shut down its output line, the intrinsically safe equipment uses the energy storage capacitors to briefly recharge, preventing it from immediately shutting down until the intrinsically safe power supply for mining resumes normal output. The disadvantage is that the required energy storage capacitor increases with the power consumption of the intrinsically safe equipment. Due to intrinsic safety requirements, the energy storage capacitor has a maximum value limit at a specific voltage. If the load current of the intrinsically safe equipment is high, the energy stored in the energy storage capacitor may not be enough to sustain the energy until the intrinsically safe power supply for mining is turned on again. To ensure the safety of the energy storage capacitors, they need to be encapsulated, and the subsequent circuits of the energy storage capacitors need to be processed so that the unencapsulated circuits of the intrinsically safe equipment cannot detect the approximate capacitance of the energy storage capacitors. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides an inrush current suppression circuit and suppression method for an intrinsically safe power supply for mining. There is no need to adjust the current response rate of the intrinsically safe power supply for mining. Only a small energy storage capacitor needs to be set on the power input side of the intrinsically safe equipment.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] In a first aspect, the present invention provides an inrush current suppression circuit for an intrinsically safe power supply for mining, comprising:

[0010] Voltage output module, used to output 2.5V reference voltage and power supply voltage VCC;

[0011] Current detection module, used to detect the size of the impact current;

[0012] Comparison module, used to compare the voltage V generated by the surge current test With reference voltage V ref The size of

[0013] Inhibits the module when V test Less than V ref When V test Greater than V ref When the surge current enters the mine-used intrinsically safe power supply, the suppression module suppresses the surge current from entering the mine-used intrinsically safe power supply.

[0014] Furthermore, the comparison module includes: a comparator N2, a resistor R5, a resistor R7, a resistor R9, a resistor R6 and a capacitor C4; a first end of the comparator N2 is connected to the resistor R5, and the resistor R5 is connected to the current detection module; a third end of the comparator N2 is connected to the resistor R7, and the resistor R7 is connected to the 2.5V reference voltage output by the voltage output module; a fourth end of the comparator N2 is connected to the resistor R6, and the resistor R6 is connected to the suppression module; a second end of the comparator N2 is grounded, and a fifth end of the comparator N2 is connected to the power supply voltage VCC output by the voltage output module; one end of the resistor R9 is connected to the third end of the comparator N2, and the other end of one end of the resistor R9 is grounded; one end of the capacitor C4 is connected to the first end of the comparator N2, and the other end of the capacitor C4 is grounded.

[0015] Furthermore, the suppression module includes: a PMOS transistor V1, an NPN transistor V2, a resistor R3, a resistor R10, a resistor R4, a resistor R8, and a capacitor C5; one end of the resistor R3 is connected to the base of the NPN transistor V2, the other end of the resistor R3 is connected to the emitter of the NPN transistor V2, one end of the resistor R10 is connected to the collector of the NPN transistor V2, the other end of the resistor R10 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the emitter of the NPN transistor V2, one end of the capacitor C5 is connected to the collector of the NPN transistor V2, and the other end of the capacitor C5 is connected to the resistor R4; the first end, the second end, and the third end of the PMOS transistor V1 are connected in parallel, one end of the resistor R4 is connected to the second end of the PMOS transistor V1, the other end of the resistor R4 is connected to the fourth end of the PMOS transistor V1, one end of the resistor R8 is connected to the fourth end of the PMOS transistor V1, and the other end of the resistor R8 is grounded.

[0016] Furthermore, the current detection module includes a current detection resistor R11, one end of the current detection resistor R11 is connected to the output side of the mining intrinsically safe power supply, the other end of the current detection resistor R11 is connected to the load device, and the other end of the current detection resistor R11 is connected to the resistor R5.

[0017] Furthermore, the voltage output module includes: a three-terminal adjustable shunt regulator N1, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a capacitor C3; the second end of the three-terminal adjustable shunt regulator N1 is connected to the resistor R1, the resistor R2 is connected in parallel with the resistor R1, one end of the capacitor C2 is connected to the first end of the three-terminal adjustable shunt regulator N1, the other end of the capacitor C2 is connected to the third end of the three-terminal adjustable shunt regulator N1, the capacitor C1 and the capacitor C3 are connected in parallel, the first end of the three-terminal adjustable shunt regulator N1 outputs a 2.5V reference voltage, and the second end of the three-terminal adjustable shunt regulator N1 outputs a supply voltage.

[0018] Furthermore, it also includes: an inductor L1 and a diode VD1, the diode VD1 is connected in parallel with the inductor L1, one end of the inductor L1 is connected to the output side of the mining intrinsically safe power supply, and the other end of the inductor L1 is connected to the suppression module.

[0019] In a second aspect, the present invention provides a method for suppressing an inrush current suppression circuit of an intrinsically safe power supply for mining, comprising the following steps:

[0020] Set the current action value I set , the current detection module detects the impact current I in real time test ; The voltage V on the current detection module test And the reference voltage V output by the voltage output moduleref Input comparison module, when V test Less than V ref When V test Greater than V ref When the surge current enters the mine-used intrinsically safe power supply, the suppression module suppresses the surge current from entering the mine-used intrinsically safe power supply.

[0021] Furthermore, when V ref >V test When the comparator N2 is not turned on, the comparator N2 outputs a high level, and the NPN transistor V2 does not meet the conduction condition; at this time, the PMOS tube V1 is turned on, the inrush current suppression circuit does not have a suppressive effect, and the mine intrinsically safe power supply can output normally;

[0022] When V ref <V test When , the comparator N2 outputs a low level, the NPN transistor V2 is turned on, at this time, the PMOS tube V1 is turned on and off; the capacitor C5 discharges through the resistor R8, causing the PMOS tube V1 to gradually turn on, suppressing the inrush current from entering the mining intrinsically safe power supply in a short time.

[0023] Furthermore, the inductor L1 can slow down the current change rate of the intrinsically safe power supply for mining, so that the action rate of the inrush current suppression circuit is faster than that of the intrinsically safe power supply for mining; the diode VD1 can suppress the reverse electromotive force generated by the sudden circuit breaker on the inductor L1, and provide a discharge channel for the reverse electromotive force.

[0024] The beneficial effect of the present invention is that the surge current suppression circuit and suppression method of the intrinsically safe power supply for mining of the present invention can effectively suppress the surge current by setting the surge current suppression circuit between the intrinsically safe power supply for mining and the load equipment. There is no need to adjust the current response rate of the intrinsically safe power supply for mining, and only a small energy storage capacitor needs to be set on the power input side of the intrinsically safe equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and examples.

[0026] Figure 1 It is a circuit diagram of the inrush current suppression circuit of the present invention.

[0027] Figure 2 It is a schematic diagram of the setting position of the inrush current suppression circuit of the present invention. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides an inrush current suppression circuit for an intrinsically safe power supply for mining, comprising: a voltage output module, a current detection module, a comparison module, and a suppression module. The voltage output module is used to output a 2.5V reference voltage and a power supply voltage VCC; the current detection module is used to detect the magnitude of the inrush current; the comparison module is used to compare the voltage V generated by the inrush current. test With reference voltage V ref The size of V test Less than V ref When V test Greater than V ref When the surge current enters the mine intrinsically safe power supply, the suppression module suppresses the surge current.

[0033] It should be noted that the surge current suppression circuit is set between the intrinsically safe power supply for mining and the load equipment (such as intrinsically safe equipment). The intrinsically safe power supply for mining supplies power to the load equipment. The surge current suppression circuit detects the magnitude of the surge current through the current measuring module and determines whether the surge current magnitude reaches the set current action value I setIn general, in order to ensure the working stability of the mine intrinsically safe power supply, the maximum operating current of the load equipment is usually set to the mine intrinsically safe power supply protection value I lim Subtract 200mA. In this embodiment, the current action value I set Set to I set =I lim -300mA. When the detected inrush current reaches the current action value I set At that moment, the inrush current suppression circuit can temporarily adjust the power supply circuit to prevent the mine intrinsically safe power supply from being cut off.

[0034] As shown in the figure, the specific structure of the inrush current suppression circuit is as follows:

[0035] The comparison module includes: a comparator N2, a resistor R5, a resistor R7, a resistor R9, a resistor R6 and a capacitor C4; a first end of the comparator N2 is connected to the resistor R5, and the resistor R5 is connected to the current detection module; a third end of the comparator N2 is connected to the resistor R7, and the resistor R7 is connected to the 2.5V reference voltage output by the voltage output module; a fourth end of the comparator N2 is connected to the resistor R6, and the resistor R6 is connected to the suppression module; a second end of the comparator N2 is grounded, and a fifth end of the comparator N2 is connected to the power supply voltage VCC output by the voltage output module; one end of the resistor R9 is connected to the third end of the comparator N2, and the other end of one end of the resistor R9 is grounded; one end of the capacitor C4 is connected to the first end of the comparator N2, and the other end of the capacitor C4 is grounded.

[0036] The suppression module includes: a PMOS transistor V1, an NPN transistor V2, a resistor R3, a resistor R10, a resistor R4, a resistor R8, and a capacitor C5; one end of the resistor R3 is connected to the base of the NPN transistor V2, the other end of the resistor R3 is connected to the emitter of the NPN transistor V2, one end of the resistor R10 is connected to the collector of the NPN transistor V2, the other end of the resistor R10 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the emitter of the NPN transistor V2, one end of the capacitor C5 is connected to the collector of the NPN transistor V2, and the other end of the capacitor C5 is connected to the resistor R4; a first end, a second end, and a third end of the PMOS transistor V1 are connected in parallel, one end of the resistor R4 is connected to the second end of the PMOS transistor V1, the other end of the resistor R4 is connected to the fourth end of the PMOS transistor V1, one end of the resistor R8 is connected to the fourth end of the PMOS transistor V1, and the other end of the resistor R8 is grounded.

[0037] The current detection module includes a current detection resistor R11, one end of the current detection resistor R11 is connected to the output side of the mining intrinsically safe power supply, the other end of the current detection resistor R11 is connected to the load device, and the other end of the current detection resistor R11 is connected to the resistor R5.

[0038] The voltage output module includes: a three-terminal adjustable shunt regulator N1, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a capacitor C3; the second end of the three-terminal adjustable shunt regulator N1 is connected to the resistor R1, the resistor R2 is connected in parallel with the resistor R1, one end of the capacitor C2 is connected to the first end of the three-terminal adjustable shunt regulator N1, the other end of the capacitor C2 is connected to the third end of the three-terminal adjustable shunt regulator N1, the capacitor C1 and the capacitor C3 are connected in parallel, the first end of the three-terminal adjustable shunt regulator N1 outputs a 2.5V reference voltage, and the second end of the three-terminal adjustable shunt regulator N1 outputs a supply voltage.

[0039] The working process of the inrush current suppression circuit is described below with reference to a specific circuit.

[0040] XS1 is the input side of the surge current suppression circuit and is connected to the output of the mine intrinsically safe power supply. XS2 is the output side of the surge current suppression circuit and is connected to the load equipment.

[0041] When the current I test When the current passes through the current detection resistor R11, a corresponding voltage value V is generated on the current detection resistor R11. test , V test =I test ×R11. Voltage V test Entering the first terminal of comparator N2, the reference voltage V test Entering the third terminal of comparator N2, The three-terminal adjustable shunt regulator N1 is model AZ431, and its output voltage can be set anywhere between 2.5V and 36V. Capacitor C2 ensures stable operation of the three-terminal adjustable shunt regulator N1. Resistors R1 and R2 limit the maximum current flowing through the three-terminal adjustable shunt regulator N1. Capacitors C1, C3, and diode VD2 form a delayed shutdown circuit. When the intrinsically safe power supply for mining is disconnected, capacitors C1 and C3 are reverse-blocked by diode VD2, and only resistors R1 and R2 can continue to supply operating current to the three-terminal adjustable shunt regulator N1, maintaining the operation of the inrush current suppression circuit. To ensure stable operation of comparator N2, the resistance values ​​of resistors R7 and R9 should not be too large; the current flowing through them (referring to R7 and R9) should be kept between 100μA and 200μA.

[0042] When V ref >V test When the comparator N2 is not turned on, due to the presence of the pull-up resistor R3, the comparator N2 outputs a high level. At this time, the NPN transistor V2 does not meet the conduction condition. The voltages of the G and S poles of the PMOS tube V1 are determined by R4 and R8 respectively. When V G <V GS And |V GS |>|VGSth |, the PMOS tube V1 is turned on; that is, the formula is satisfied V pow Indicates the input voltage of the inrush current suppression circuit, V GSth Indicates the conduction threshold of the PMOS tube V1. At this time, the mine intrinsically safe power supply can output normally through the inrush current suppression circuit.

[0043] When V ref <V test At this time, the impact current value exceeds the current action value I set Comparator N2 outputs a low level, turning on NPN transistor V2. At the moment NPN transistor V2 turns on, capacitor C5 acts as a short circuit. At this point, the voltage at the G terminal of PMOS transistor V1 is equal to the voltage at the S terminal, failing the turn-on condition and turning off PMOS transistor V1. Capacitor C5 discharges through resistor R8, gradually turning on PMOS transistor V1. This effectively suppresses the inrush current entering the intrinsically safe mining power supply within a short period of time.

[0044] When the current I test Continuously greater than the current action value I set When the voltage is less than the protection value of the intrinsically safe power supply for mining, the comparator N2 maintains the output low level and the NPN transistor V2 remains on. Without considering transient phenomena, the resistor R10 is equivalent to being connected in parallel with R4. As long as the voltage divided by R10 and R4 in parallel and R8 is greater than the conduction threshold of the PMOS tube V1, the formula is satisfied. The PMOS tube V1 can still be turned on normally. Therefore, the inrush current suppression circuit is only turned on when the inrush current is greater than the action setting value I set It works when the voltage is too low and will not affect the output of the mine intrinsically safe power supply under normal circumstances.

[0045] The inrush current suppression circuit also includes an inductor L1 and a diode VD1. Diode VD1 is connected in parallel with inductor L1. One end of inductor L1 is connected to the output of the intrinsically safe mine power supply, and the other end is connected to the suppression module. Inductor L1 slows the rate of change of the current in the intrinsically safe mine power supply, ensuring that the inrush current suppression circuit operates faster than the power supply itself. The value of inductor L1 is typically around 2.2μH to minimize its impact on the intrinsic safety parameters of the power supply. Diode VD1, as a freewheeling device, suppresses the reverse electromotive force generated by a sudden circuit breaker in inductor L1, providing a discharge path for this reverse electromotive force.

[0046] Example 2

[0047] This embodiment provides a method for suppressing an inrush current suppression circuit of an intrinsically safe power supply for mining, comprising the following steps: setting a current action value I set, the current detection module detects the impact current I test ; Voltage V on the current detection module test And the reference voltage V output by the voltage output module ref Input comparison module, when V test Less than V ref When V test Greater than V ref When the surge current enters the mine intrinsically safe power supply, the suppression module suppresses the surge current.

[0048] When V ref >V test When , comparator N2 is not turned on, comparator N2 outputs a high level, and NPN transistor V2 does not meet the conduction condition; at this time, PMOS tube V1 is turned on, the inrush current suppression circuit does not have a suppressive effect, and the mine intrinsically safe power supply can output normally.

[0049] When V ref <V test When , comparator N2 outputs a low level, NPN transistor V2 is turned on, at this time, PMOS tube V1 is turned on and off; capacitor C5 discharges through resistor R8, making PMOS tube V1 gradually turned on (the values ​​of C5 and R8 can be changed to set the turn-on speed), suppressing the inrush current from entering the mining intrinsically safe power supply in a short time (for example, within 10us).

[0050] Inductor L1 can slow down the current change rate of the intrinsically safe power supply for mining, so that the action rate of the inrush current suppression circuit is faster than that of the intrinsically safe power supply for mining; diode VD1 can suppress the reverse electromotive force generated by the sudden circuit breaker on inductor L1, and provide a discharge channel for the reverse electromotive force.

[0051] To sum up, the surge current suppression circuit and suppression method of the intrinsically safe power supply for mining of the present invention can effectively suppress the surge current by setting the surge current suppression circuit between the intrinsically safe power supply for mining and the load equipment. There is no need to adjust the current response rate of the intrinsically safe power supply for mining. Only a smaller energy storage capacitor needs to be set on the power input side of the intrinsically safe equipment.

[0052] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical spirit of this invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A surge current suppression circuit for an intrinsically safe power supply for mining, characterized in that: include: Voltage output module, used to output 2.5V reference voltage and power supply voltage VCC; Current detection module, used to detect the size of the impact current; Comparison module, used to compare the voltage V generated by the surge current test With reference voltage V ref size; Inhibits the module when V test Less than V ref When V test Greater than V ref When the surge current enters the mine-used intrinsically safe power supply, the suppression module suppresses the surge current from entering the mine-used intrinsically safe power supply.

2. The inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 1, characterized in that: The comparison module includes: Comparator N2, resistor R5, resistor R7, resistor R9, resistor R6 and capacitor C4; A first end of the comparator N2 is connected to a resistor R5, which is connected to a current detection module; a third end of the comparator N2 is connected to a resistor R7, which is connected to a 2.5V reference voltage output by a voltage output module; a fourth end of the comparator N2 is connected to a resistor R6, which is connected to a suppression module; a second end of the comparator N2 is grounded, and a fifth end of the comparator N2 is connected to a power supply voltage VCC output by a voltage output module; one end of the resistor R9 is connected to a third end of the comparator N2, and the other end of one end of the resistor R9 is grounded; one end of the capacitor C4 is connected to a first end of the comparator N2, and the other end of the capacitor C4 is grounded.

3. The inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 2, characterized in that: The suppression module comprises: PMOS transistor V1, NPN transistor V2, resistor R3, resistor R10, resistor R4, resistor R8 and capacitor C5; One end of the resistor R3 is connected to the base of the NPN transistor V2, and the other end of the resistor R3 is connected to the emitter of the NPN transistor V2. One end of the resistor R10 is connected to the collector of the NPN transistor V2, and the other end of the resistor R10 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the emitter of the NPN transistor V2. One end of the capacitor C5 is connected to the collector of the NPN transistor V2, and the other end of the capacitor C5 is connected to the resistor R4. The first end, the second end, and the third end of the PMOS transistor V1 are connected in parallel, one end of the resistor R4 is connected to the second end of the PMOS transistor V1, and the other end of the resistor R4 is connected to the fourth end of the PMOS transistor V1. One end of the resistor R8 is connected to the fourth end of the PMOS transistor V1, and the other end of the resistor R8 is grounded.

4. The inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 3, characterized in that: The current detection module includes a current detection resistor R11, one end of which is connected to the output side of the intrinsically safe power supply for mining, the other end of which is connected to the load device, and the other end of which is connected to the resistor R5.

5. The inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 3, characterized in that: The voltage output module includes: A three-terminal adjustable shunt regulator N1, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a capacitor C3; the second end of the three-terminal adjustable shunt regulator N1 is connected to the resistor R1, the resistor R2 is connected in parallel with the resistor R1, one end of the capacitor C2 is connected to the first end of the three-terminal adjustable shunt regulator N1, the other end of the capacitor C2 is connected to the third end of the three-terminal adjustable shunt regulator N1, the capacitor C1 and the capacitor C3 are connected in parallel, the first end of the three-terminal adjustable shunt regulator N1 outputs a 2.5V reference voltage, and the second end of the three-terminal adjustable shunt regulator N1 outputs a supply voltage.

6. The inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 1, characterized in that: Also includes: An inductor L1 and a diode VD1, wherein the diode VD1 is connected in parallel with the inductor L1, one end of the inductor L1 is connected to the output side of the intrinsically safe power supply for mining, and the other end of the inductor L1 is connected to the suppression module.

7. A method for suppressing an inrush current suppression circuit of an intrinsically safe power supply for mining according to any one of claims 1 to 6, characterized in that: The following steps are involved: Set the current action value I set , the current detection module detects the impact current I test ; The voltage V on the current detection module test And the reference voltage V output by the voltage output module ref Input comparison module, when V test Less than V ref When V test Greater than V ref When the surge current enters the mine-used intrinsically safe power supply, the suppression module suppresses the surge current from entering the mine-used intrinsically safe power supply.

8. The method for suppressing the inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 7, characterized in that: When V ref >V test When the comparator N2 is not turned on, the comparator N2 outputs a high level, and the NPN transistor V2 does not meet the conduction condition; at this time, the PMOS tube V1 is turned on, the inrush current suppression circuit does not have a suppressive effect, and the mine intrinsically safe power supply can output normally; When V ref <V test When , the comparator N2 outputs a low level, the NPN transistor V2 is turned on, at this time, the PMOS tube V1 is turned on and off; the capacitor C5 discharges through the resistor R8, causing the PMOS tube V1 to gradually turn on, suppressing the inrush current from entering the mining intrinsically safe power supply in a short time.

9. The method for suppressing the inrush current suppression circuit of the intrinsically safe power supply for mining according to claim 7, characterized in that: Inductor L1 can slow down the current change rate of the intrinsically safe power supply for mining, so that the action rate of the inrush current suppression circuit is faster than that of the intrinsically safe power supply for mining; diode VD1 can suppress the reverse electromotive force generated by the sudden circuit breaker on inductor L1, and provide a discharge channel for the reverse electromotive force.

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