Low-cost intrinsic safety grid control system and control method thereof

Abstract

The invention relates to the technical field of intrinsic safety equipment protection, in particular to a low-cost intrinsic safety grid control system and a control method thereof.The intrinsic safety grid control system comprises a current limiting module, a voltage limiting module and a temperature protection module, one end of the current limiting module is connected with the input end of an intrinsic safety power source, and the current limiting module is used for conducting current limiting protection on the intrinsic safety power source; one end of the voltage limiting module is connected with the other end of the current limiting module, the voltage limiting module is used for carrying out voltage limiting protection on the intrinsic safety power supply, one end of the temperature protection module is connected with the other end of the voltage limiting module, and the other end of the temperature protection module is connected with the output end of the intrinsic safety power supply. And the temperature protection module is used for performing over-temperature protection on the intrinsic safety power supply. Two-stage current-limiting protection, voltage-limiting protection and over-temperature protection are adopted, so that the size of the intrinsically safe grid system can be reduced, and meanwhile, full-load calculation of a rear-stage load can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of intrinsically safe equipment protection, and in particular to a low-cost intrinsically safe barrier control system and a control method thereof. Background Art

[0002] Intrinsically safe equipment is widely used in coal mines to collect environmental data and control equipment. All intrinsically safe equipment requires an intrinsically safe power supply to power it. The output protection of the intrinsically safe power supply is mainly to limit the input voltage of the previous power supply and to protect the external output overcurrent. That is, when the power supply voltage is greater than the threshold value or the load current of the subsequent stage is greater than the threshold value, the output is limited to ensure that the output current and voltage of the subsequent stage do not exceed the safety standard, so as to avoid sparks caused by short circuits and dye flammable and explosive gases underground.

[0003] At present, the intrinsically safe output protection methods are:

[0004] 1. Constant current mode: When the current exceeds the threshold, the current is kept constant at this threshold. The disadvantage is that a huge heat sink is required (the reason is that when the output is short-circuited, the power output of the power supply is completely lost in the corresponding MOS tube or resistor, resulting in huge heat generation. Taking the output of an intrinsically safe power supply of 18V / 1A as an example, when an external short circuit is formed, the internal power consumption is 18W. According to the heat sink formula: The minimum effective heat sink area formula for calculating the heat sink based on the known temperature rise is: Area[A](cm2)=(50 / (℃ / W)) 2 ) According to the room temperature of 30℃ and the maximum temperature of 90℃, the temperature rise coefficient is 60℃ / 18W=3.33, and the heat dissipation area is 225cm 2 , corresponding to a 25cm*25cm flat heat sink, so the volume of the constant current intrinsically safe power supply is often large;

[0005] 2. Cut-off mode: When the current exceeds the threshold, the output is immediately turned off and then turned on again after a period of time. The cut-off mode is small in size, but the disadvantage is that the actual load is insufficient. Since the load has capacitance, the power supply has a charging process for the device capacitance when it is powered on. This charging process will cause the load current to exceed the rated current by more than 30%. When the number of devices increases, the total current of the power-on impact is very likely to be greater than the power threshold value. Once the current exceeds the threshold, the intrinsic safety barrier of the cut-off mode is immediately closed, the power supply is cut off, the power supply of the subsequent equipment is cut off, and the startup fails. After a certain period of time, the intrinsic safety barrier is reopened, the load capacitance is recharged, and the impact current appears again. This cycle leads to The subsequent stage is constantly restarted (taking the reaction time of the intrinsically safe barrier of the cut-off mode to the impact as 5ms as an example: the cut-off time of the intrinsically safe barrier is 5ms. When starting, the maximum current is less than the current of the intrinsically safe barrier or the duration is less than 5ms, which will not cause the output of the intrinsically safe barrier to be cut off. However, if the subsequent load has a large capacitance, plus the current required when the device itself starts, according to the charging time (T) = R×C×ln(V1÷V2)), once the capacitance of the subsequent load exceeds 10uF, there is a risk of protection at startup, which causes the entire device to restart repeatedly). Therefore, the subsequent load of the intrinsically safe power supply of the cut-off mode cannot often be calculated according to the rated full load;

[0006] In addition, in order to realize the function of the cutoff protection, most of the solutions currently used adopt surge protection semiconductor chips (such as LM5069), which are expensive. Summary of the invention

[0007] The technical problem to be solved by the present invention is: in order to solve the technical problems that the existing intrinsically safe barrier protection method is large in size and the subsequent load cannot be fully loaded, the present invention provides a low-cost intrinsically safe barrier control system and a control method thereof. By adopting a two-stage overvoltage, current limiting and overheating protection method, the volume of the intrinsically safe barrier system can be reduced and it can be ensured that the subsequent load can be calculated at full load.

[0008] The technical solution adopted by the present invention to solve its technical problem is: a low-cost intrinsically safe barrier control system, including: a current limiting module, a voltage limiting module and a temperature protection module, one end of the current limiting module is connected to the input end of the intrinsically safe power supply, the current limiting module is used to perform current limiting protection on the intrinsically safe power supply, one end of the voltage limiting module is connected to the other end of the current limiting module, the voltage limiting module is used to perform voltage limiting protection on the intrinsically safe power supply, one end of the temperature protection module is connected to the other end of the voltage limiting module, and the other end of the temperature protection module is connected to the output end of the intrinsically safe power supply, so the temperature protection module is used to perform over-temperature protection on the intrinsically safe power supply.

[0009] Therefore, by adopting two-stage current limiting protection, voltage limiting protection and over-temperature protection, there is no need to provide a huge heat dissipation space, thereby reducing the volume of the intrinsically safe barrier system and ensuring that the subsequent load can be calculated at full load.

[0010] Furthermore, the current limiting module includes: a resistor R1, a resistor R2, and a transistor V1, one end of the resistor R1 is connected to the input end of the intrinsically safe power supply, the other end of the resistor R1 is connected to one end of the resistor R2, the emitter of the transistor V1 is connected to the input end of the intrinsically safe power supply, the base of the transistor V1 is connected to the other end of the resistor R2, and the base of the transistor V1 and the collector of the transistor V1 are both connected to the voltage limiting module. Therefore, the constant current of the output current of the current limiting module is This constant current source is simple and easy to use, and the current can be freely controlled by adjusting the resistors R1 and R2. No special components are used, which is conducive to reducing the cost of the product.

[0011] Furthermore, the voltage limiting module includes: resistor R3, voltage regulator VD1, resistor R4, transistor V2 and resistor R5, one end of resistor R3 is connected to the base of transistor V1, the other end of resistor R3 and one end of resistor R4 are connected to the negative electrode of voltage regulator VD1, the other end of resistor R4 is connected to the base of transistor V2, one end of resistor R3 and one end of resistor R5 are connected to the emitter of transistor V2, the collector of transistor V1 and the other end of resistor R5 are connected to the collector of transistor V2, and both ends of resistor R5 are connected to the temperature protection module. Therefore, the maximum value of the voltage protection output of the voltage limiting module is the conduction voltage V+V of the voltage regulator VD1. be This voltage protection is simple and easy, and the value of the protection voltage can be freely controlled by adjusting the voltage conduction value of the voltage regulator tube VD1. No special components are used, which is conducive to reducing the cost of the product.

[0012] Furthermore, the temperature protection module includes: a fuse F1, a MOS tube V3 and a voltage regulator tube VD2, one end of the fuse F1 is connected to one end of the resistor R5, the other end of the fuse F1 is connected to the third port of the MOS tube V3, the first port of the MOS tube V3 is connected to the other end of the resistor R5, the second port of the MOS tube V3 is connected to the positive electrode of the voltage regulator tube VD2, and the negative electrode of the voltage regulator tube VD2 is connected to the output end of the intrinsically safe power supply. Thus, the over-temperature protection of the self-resettable fuse is triggered by the heat dissipated by the constant current of the MOS tube instead of directly using the over-current protection of the traditional self-resettable fuse, so there is no need to increase the huge heat dissipation space; the temperature protection module uses the temperature characteristics of the self-resettable fuse F1, when the temperature of the MOS tube V3 rises to a certain temperature threshold, the impedance of the self-resettable fuse F1 rises rapidly, so that the current flowing through the MOS tube V3 decreases, so as to achieve the over-temperature protection of the MOS tube V3.

[0013] Furthermore, it also includes: a resistor R6, one end of which is connected to the first port of the MOS tube V3. Therefore, the purpose of setting the resistor R6 is to limit the current when the triode V1 and the triode V2 are turned on and to raise the gate voltage of the MOS tube V3 when the triode V1 and the triode V2 are turned on to achieve the purpose of turning off the MOS tube V3; in addition, when the triode V1 and the triode V2 are not turned on, the two ends of the resistor R6 are not powered, the gate voltage of the MOS tube V3 is 0, and the MOS tube V3 is turned on. When there is overcurrent or overvoltage, when the triode V1 and the triode V2 are turned on, the gate voltage is the circuit input port voltage, so that the MOS tube V3 is turned off and the subsequent stage is powered off, so as to achieve the purpose of overcurrent and overvoltage protection.

[0014] Furthermore, the positive electrode of the voltage regulator tube VD1 and the other end of the resistor R6 are both grounded.

[0015] A low-cost control method for an intrinsically safe barrier control system comprises the following steps:

[0016] S1, power on the intrinsically safe power supply;

[0017] S2, the intrinsically safe power supply passes through the current limiting module. When the rear-stage current of the intrinsically safe power supply exceeds the current threshold value, the intrinsically safe barrier control system enters a constant current state;

[0018] S3, intrinsically safe power supply passes through the voltage limiting module;

[0019] S4. The intrinsically safe power supply passes through the temperature protection module. If the temperature of the intrinsically safe power supply rises to the temperature threshold value, the intrinsically safe barrier control system enters the cutoff mode and the intrinsically safe power supply turns off the output;

[0020] S5. If the temperature of the intrinsically safe power supply drops to the temperature threshold, the output of the intrinsically safe power supply will be turned on again.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Two-stage current limiting protection, voltage limiting protection and over-temperature protection are adopted. In particular, the heat dissipated by the constant current of the MOS tube is used to trigger the over-temperature protection of the resettable fuse instead of directly using the over-current protection of the traditional resettable fuse. Therefore, there is no need to increase the huge heat dissipation space, thereby reducing the volume of the intrinsically safe barrier system. At the same time, it can ensure that the subsequent load can be calculated at full load. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 A circuit diagram of a low-cost intrinsically safe barrier control system of the present invention;

[0025] Figure 2The figure is a flow chart of the control method of the low-cost intrinsically safe barrier control system of the present invention.

[0026] In the figure: 1. Current limiting module; 2. Voltage limiting module; 3. Temperature protection module. DETAILED DESCRIPTION

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1As shown, a low-cost intrinsically safe barrier control system includes: a current limiting module 1, a voltage limiting module 2 and a temperature protection module 3, one end of the current limiting module 1 is connected to the input end of the intrinsically safe power supply, the current limiting module 1 is used to perform current limiting protection on the intrinsically safe power supply, one end of the voltage limiting module 2 is connected to the other end of the current limiting module 1, the voltage limiting module 2 is used to perform voltage limiting protection on the intrinsically safe power supply, one end of the temperature protection module 3 is connected to the other end of the voltage limiting module 2, and the other end of the temperature protection module 3 is connected to the output end of the intrinsically safe power supply, so the temperature protection module 3 is used to perform over-temperature protection on the intrinsically safe power supply. Therefore, by adopting two-stage current limiting protection, voltage limiting protection and over-temperature protection, there is no need to provide a huge heat dissipation space, thereby reducing the volume of the intrinsically safe barrier system, and at the same time, it can ensure that the subsequent load can be calculated at full load.

[0031] Specifically, two-level protection means that according to the requirements of coal mine safety standards, two identical protection circuits need to be connected in series for protection to prevent the failure of one of the protection circuits from causing the failure of the entire protection.

[0032] In this embodiment, the current limiting module 1 of one level includes: resistor R1, resistor R2, transistor V1, one end of resistor R1 is connected to the input end of the intrinsically safe power supply, the other end of resistor R1 is connected to one end of resistor R2, the emitter of transistor V1 is connected to the input end of the intrinsically safe power supply, the base of transistor V1 is connected to the other end of resistor R2, and the base of transistor V1 and the collector of transistor V1 are connected to the voltage limiting module 2. Therefore, the constant current of the output current of the current limiting module 1 is This constant current source is simple and easy to use, and the current can be freely controlled by adjusting the resistors R1 and R2. No special components are used, which is conducive to reducing the cost of the product.

[0033] Specifically, when the on-state voltage of transistor V1 is fixed at 0.5V, the current flowing through resistors R1 and R2 is At the same time, the current flowing through the resistor R1 and the resistor R2 is also the current of the first port end of the MOS tube V3; when the current flowing through the resistor R1 and the resistor R2 increases to When the transistor V1 is turned on, the current flows from the E terminal of the transistor V1 to the C terminal of the transistor V1. Since the MOS tube V3 is a POMS tube, the gate opening and closing is a voltage type. The conduction of the transistor V1 makes the gate voltage of the MOS tube V3 increase; when the transistor V1 is turned off, the gate voltage of the MOS tube V3 becomes low, and the MOS tube V3 is turned on again. In this way, the current can be dynamically controlled at This can then play the role of constant current.

[0034] For example, to design an intrinsically safe power supply with a maximum current of 600mA and a voltage of 12, the model of the third-level terminal V1 is SS8550, V beThe typical on-state voltage is 0.66V and the actual on-state voltage is 0.6V. Therefore, the resistor R1 = 1Ω and the resistor R2 = 0.1Ω are used for current fine-tuning.

[0035] In this embodiment, the voltage limiting module 2 includes: a resistor R3, a voltage regulator VD1, a resistor R4, a transistor V2 and a resistor R5. One end of the resistor R3 is connected to the base of the transistor V1, the other end of the resistor R3 and one end of the resistor R4 are both connected to the negative electrode of the voltage regulator VD1, the other end of the resistor R4 is connected to the base of the transistor V2, one end of the resistor R3 and one end of the resistor R5 are both connected to the emitter of the transistor V2, the collector of the transistor V1 and the other end of the resistor R5 are both connected to the collector of the transistor V2, both ends of the resistor R5 are connected to the temperature protection module 3, and the positive electrode of the voltage regulator VD1 is grounded. Therefore, the maximum value of the voltage protection output of the voltage limiting module 2 is the conduction voltage V+V of the voltage regulator VD1. be This voltage protection is simple and easy, and the value of the protection voltage can be freely controlled by adjusting the voltage conduction value of the voltage regulator tube VD1. No special components are used, which is conducive to reducing the cost of the product.

[0036] Specifically, the maximum allowable voltage of the voltage regulator VD1 is V. When the voltage across the voltage regulator VD1 is greater than V+V be When the voltage regulator tube VD1 is turned on, the be pin of the transistor V2 is turned on. The conduction of the transistor V2 raises the gate voltage of the MOS tube V3 corresponding to the resistor R6. When the MOS tube V3 is turned off, the output of the intrinsically safe power supply is turned off until the voltage drops to V+V be The post-stabilizer tube VD1 is turned off, so that the transistor V2 is turned off, and then the gate voltage of the MOS tube V3 is reduced, the MOS tube V3 is turned on, and the output of the intrinsically safe power supply is restored.

[0037] For example, an intrinsically safe power supply with an output voltage of 12V is designed, and the protection voltage is 13.5V (that is, when the output voltage of the intrinsically safe power supply exceeds 13.5V, its output is cut off). The model of the voltage regulator VD1 is MM1Z13V, and the conduction voltage of the voltage regulator VD1 is 13V, plus the conduction voltage of the transistor V2 is 0.5V. When the voltage across the input port is greater than 13.5V, the voltage regulator VD1 is turned on, and then the transistor V2 is turned on, and the MOS tube V3 is turned off, and the output of the intrinsically safe power supply is cut off.

[0038] In this embodiment, the temperature protection module 3 includes: a fuse F1, a MOS tube V3 and a voltage regulator tube VD2, one end of the fuse F1 is connected to one end of the resistor R5, the other end of the fuse F1 is connected to the third port of the MOS tube V3, the first port of the MOS tube V3 is connected to the other end of the resistor R5, the second port of the MOS tube V3 is connected to the positive electrode of the voltage regulator tube VD2, and the negative electrode of the voltage regulator tube VD2 is connected to the output end of the intrinsically safe power supply. Thus, the over-temperature protection of the self-resettable fuse is triggered by the heat dissipated by the constant current of the MOS tube instead of directly using the over-current protection of the traditional self-resettable fuse, so there is no need to increase the huge heat dissipation space; the temperature protection module 3 uses the temperature characteristics of the self-resettable fuse F1, when the temperature of the MOS tube V3 rises to a certain temperature threshold, the impedance of the self-resettable fuse F1 rises rapidly, so that the current flowing through the MOS tube V3 decreases, so as to achieve the over-temperature protection of the MOS tube V3.

[0039] Specifically, in order to start protecting the MOS tube V3 before it is damaged by high temperature, the resettable fuse F1 should select a suitable effective temperature. For example, the resettable fuse F1 of model RFR9024NTRPBF is used. The operating temperature of this MOS tube V3 is -50℃-150℃, and the design control temperature point is 70℃. In this way, when designing an intrinsically safe power supply with a constant current of 600mA, a resettable fuse with a current of 600mA at 70℃ should be selected, as shown in Table 1 (temperature-current table of resettable fuse F1) The corresponding model is the resettable fuse (F1) of BSMD1206-100. As the temperature of the MOS tube V3 rises, the current allowed to pass through the resettable fuse F1 decreases. When the MOS tube V3 works at a constant current, its surface temperature rises rapidly (2-3 seconds in a short circuit). When the temperature is greater than 70°C, the current allowed to pass through the resettable fuse F1 is less than 600mA, so that the MOS tube V3 is transferred from a constant current state to a fully open state, and the temperature of the MOS tube V3 decreases. In this way, over-temperature protection of the MOS tube V3 is achieved.

[0040] Table 1: Temperature-current table of resettable fuse F1

[0041]

[0042] In this embodiment, it also includes: a resistor R6, one end of the resistor R6 is connected to the first port of the MOS tube V3, and the other end of the resistor R6 is grounded. Therefore, the purpose of setting the resistor R6 is to limit the current when the triode V1 and the triode V2 are turned on and to raise the gate voltage of the MOS tube V3 when the triode V1 and the triode V2 are turned on to achieve the purpose of turning off the MOS tube V3; in addition, when the triode V1 and the triode V2 are not turned on, the two ends of the resistor R6 are not powered, the gate voltage of the MOS tube V3 is 0, and the MOS tube V3 is turned on. When there is overcurrent or overvoltage, when the triode V1 and the triode V2 are turned on, the gate voltage is the circuit input port voltage, so that the MOS tube V3 is turned off and the subsequent stage is powered off, so as to achieve the purpose of overcurrent and overvoltage protection.

[0043] like Figure 2 As shown, a low-cost intrinsically safe barrier control system control method includes the following steps:

[0044] S1, power on the intrinsically safe power supply;

[0045] S2, the intrinsically safe power supply passes through the current limiting module 1. When the rear-stage current of the intrinsically safe power supply exceeds the current threshold value, the intrinsically safe gate control system enters a constant current state;

[0046] S3, intrinsically safe power supply passes through voltage limiting module 2;

[0047] S4, the intrinsically safe power supply passes through the temperature protection module 3. If the temperature of the intrinsically safe power supply rises to the temperature threshold value, the intrinsically safe barrier control system enters the cutoff mode and the intrinsically safe power supply turns off the output;

[0048] S5. If the temperature of the intrinsically safe power supply drops to the temperature threshold, the output of the intrinsically safe power supply will be turned on again.

[0049] Specifically, in step S2, the constant current state means: the current of the intrinsically safe power supply is kept constant at In step S5, the cutoff mode means that when the temperature of the intrinsically safe power supply rises to the temperature threshold value, the output of the intrinsically safe power supply is turned off.

[0050] In summary, the present invention adopts two-stage current limiting protection, voltage limiting protection and over-temperature protection, especially utilizing the heat dissipated by the constant current of the MOS tube to trigger the over-temperature protection of the resettable fuse instead of directly adopting the over-current protection of the traditional resettable fuse. Therefore, there is no need to increase the huge heat dissipation space, thereby reducing the volume of the intrinsically safe gate system, and at the same time, it can ensure that the subsequent load can be calculated at full load.

[0051] The above description is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A low-cost intrinsically safe barrier control system, characterized in that: include: A current limiting module (1), one end of the current limiting module (1) being connected to an input end of an intrinsically safe power supply, and the current limiting module (1) being used to perform current limiting protection on the intrinsically safe power supply; A voltage limiting module (2), one end of the voltage limiting module (2) being connected to the other end of the current limiting module (1), and the voltage limiting module (2) being used to perform voltage limiting protection on the intrinsically safe power supply; A temperature protection module (3), one end of the temperature protection module (3) is connected to the other end of the voltage limiting module (2), and the other end of the temperature protection module (3) is connected to the output end of the intrinsically safe power supply, so the temperature protection module (3) is used to perform over-temperature protection on the intrinsically safe power supply.

2. The low-cost intrinsically safe barrier control system according to claim 1, characterized in that: The current limiting module (1) comprises: A resistor R1, a resistor R2, and a transistor V1, one end of the resistor R1 is connected to the input end of the intrinsically safe power supply, the other end of the resistor R1 is connected to one end of the resistor R2, the emitter of the transistor V1 is connected to the input end of the intrinsically safe power supply, the base of the transistor V1 is connected to the other end of the resistor R2, and the base of the transistor V1 and the collector of the transistor V1 are both connected to the voltage limiting module (2).

3. The low-cost intrinsically safe barrier control system according to claim 2, characterized in that: The voltage limiting module (2) comprises: A resistor R3, a voltage regulator tube VD1, a resistor R4, a transistor V2 and a resistor R5, one end of the resistor R3 is connected to the base of the transistor V1, the other end of the resistor R3 and one end of the resistor R4 are both connected to the negative electrode of the voltage regulator tube VD1, the other end of the resistor R4 is connected to the base of the transistor V2, one end of the resistor R3 and one end of the resistor R5 are both connected to the emitter of the transistor V2, the collector of the transistor V1 and the other end of the resistor R5 are both connected to the collector of the transistor V2, and both ends of the resistor R5 are connected to the temperature protection module (3).

4. The low-cost intrinsically safe barrier control system according to claim 3 is characterized in that: The temperature protection module (3) comprises: Fuse F1, MOS tube V3 and voltage regulator tube VD2, one end of the fuse F1 is connected to one end of the resistor R5, the other end of the fuse F1 is connected to the third port of the MOS tube V3, the first port of the MOS tube V3 is connected to the other end of the resistor R5, the second port of the MOS tube V3 is connected to the positive electrode of the voltage regulator tube VD2, and the negative electrode of the voltage regulator tube VD2 is connected to the output end of the intrinsically safe power supply.

5. The low-cost intrinsically safe barrier control system according to claim 4, characterized in that: Also includes: Resistor R6, one end of the resistor R6 is connected to the first port of the MOS tube V3.

6. The low-cost intrinsically safe barrier control system according to claim 5, characterized in that: The positive electrode of the voltage regulator tube VD1 and the other end of the resistor R6 are both grounded.

7. A control method for a low-cost intrinsically safe barrier control system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, power on the intrinsically safe power supply; S2, the intrinsically safe power supply passes through the current limiting module (1), when the rear-stage current of the intrinsically safe power supply exceeds the current threshold value, the intrinsically safe gate control system enters a constant current state; S3, the intrinsically safe power supply passes through the voltage limiting module (2); S4, the intrinsically safe power supply passes through the temperature protection module (3). If the temperature of the intrinsically safe power supply rises to the temperature threshold value, the intrinsically safe barrier control system enters the cutoff mode and the intrinsically safe power supply turns off the output; S5. If the temperature of the intrinsically safe power supply drops to the temperature threshold, the output of the intrinsically safe power supply will be turned on again.

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