A low-power, compact, dual-channel intrinsically safe power supply based on a switching power supply

Abstract

This utility model belongs to the field of power supply technology, specifically relating to a low-power, compact, dual-channel intrinsically safe protection power supply based on a switching power supply. This utility model employs a switching power supply with two intrinsically safe protection modules. The switching power supply uses a high-frequency transformer, approximately one-third the size of a conventional transformer, and utilizes a switching power supply chip design with overvoltage protection circuitry. The chip has built-in overcurrent protection, providing a third level of protection when the two intrinsically safe protection modules fail. The intrinsically safe modules are controlled by integrated digital chips and have a self-locking function. Advantages include low heat generation, strong anti-interference capability of the isolated power supply, small size, self-locking capability in case of fault, and strong adaptability to power fluctuations.

Description

Technical Field

[0001] This utility model belongs to the field of power supply technology, specifically relating to a low-power, compact, dual-channel intrinsically safe power supply based on a switching power supply. Background Technology

[0002] Intrinsically safe power supplies play a crucial role in many fields with extremely high requirements for the safety of electrical equipment, such as industrial automation, coal mining, and petrochemicals.

[0003] Traditional intrinsically safe power supplies typically use ordinary transformers to step down the voltage, followed by rectification by a rectifier bridge, and then secondary voltage regulation using linear regulator chips. Overcurrent protection relies on comparators. However, this traditional design has several significant drawbacks. Firstly, ordinary transformers are large, resulting in a bulky intrinsically safe power supply that is extremely inconvenient to install and use in applications with strict space requirements. Secondly, the heatsinks of linear regulator chips generate significant heat during operation, wasting energy and potentially affecting equipment stability and lifespan due to overheating. Furthermore, due to their linear design, traditional intrinsically safe power supplies have low load capacity, leading to large voltage drops and other malfunctions under full load. Additionally, due to limitations in their voltage regulation principle and overcurrent protection mechanisms, traditional intrinsically safe power supplies have a narrow voltage fluctuation range and poor anti-interference capabilities, making them unreliable and unable to operate stably in complex electromagnetic environments, failing to meet the high-performance and high-reliability demands of modern industry. Therefore, the development of a new type of intrinsically safe power supply is urgently needed to address the various problems of traditional intrinsically safe power supplies, improve power supply performance, and meet the evolving needs of industry. Utility Model Content

[0004] This invention provides a low-power, compact, dual-channel intrinsically safe protection power supply based on a switching power supply. It employs a switching power supply with two intrinsically safe protection modules. The switching power supply uses a high-frequency transformer, approximately one-third the size of a conventional transformer. It utilizes a switching power supply chip design with overvoltage protection circuitry and built-in overcurrent protection, providing a third level of protection in case of failure of the two intrinsically safe protection modules. The intrinsically safe modules are controlled by an integrated digital chip and have a self-locking function. Advantages include low heat generation, strong anti-interference capability of the isolated power supply, small size, self-locking capability in case of fault, and strong adaptability to power fluctuations.

[0005] The present invention adopts the following technical solution: A low-power, compact, dual-channel intrinsically safe power supply based on a switching power supply includes a power input port, a DC output port, a high-voltage processing section, a high-frequency transformer, a control circuit, and an intrinsically safe module. The high-voltage processing section includes fuses, surge protectors, high and low frequency filter circuits, and rectifier circuits; it is used to process the input power supply. The control circuit controls the output of the high-frequency transformer by setting parameters, and includes a switching power supply control chip and supporting circuitry. The intrinsically safe module is an independent module that is mounted vertically. The intrinsically safe module is equipped with overvoltage protection and overcurrent protection.

[0006] Furthermore, it also includes a low-voltage energy storage section for storing redundant electrical energy, enabling instantaneous high-current output, and filtering interference generated by electrical appliances.

[0007] Furthermore, the switching power supply control chip has built-in overcurrent protection.

[0008] Furthermore, the control circuit includes an overvoltage protection circuit.

[0009] Furthermore, the intrinsically safe module is controlled by an integrated digital chip and has a self-locking function.

[0010] The beneficial effects of this utility model are as follows: (1) This utility model adopts a switching power supply design and uses a high-frequency transformer for voltage reduction. Under the same load, the volume is about one-third of that of a regular transformer. It can be directly soldered onto the circuit board. The switching power supply control chip and the supporting circuit together form the control circuit. The SMT process is used and it is soldered to the back of the intrinsically safe power supply. The switching power supply generates very little heat and does not require a heat sink, which can greatly reduce the space occupied.

[0011] (2) This utility model is based on the design of a switching power supply. The switching power supply control chip has built-in overcurrent protection and an overvoltage protection circuit is provided in the 6 control circuit. That is, the switching power supply itself is equipped with overvoltage and overcurrent protection functions, which can realize the third level of protection when the intrinsically safe module 1 and intrinsically safe module 2 fail at the same time, greatly increasing safety.

[0012] (3) The intrinsically safe power supply of this utility model uses integrated digital chip control for intrinsically safe module one and intrinsically safe module two. It has a self-locking function. After a fault occurs, the circuit will be self-locked to prevent the continued output current from damaging the electrical equipment. The equipment can only be restored after restarting.

[0013] (4) The intrinsically safe module of the intrinsically safe power supply of this utility model is a modular design. When a fault occurs, there is no need to troubleshoot the fault. The module can be directly replaced to realize the rapid repair of the circuit. (5) The intrinsically safe power supply of this utility model adopts a switching power supply design, which is an isolated power supply. High and low frequency filtering circuits are built into the high voltage processing section, which can effectively reduce power supply interference. Attached Figure Description

[0014] Figure 1 This is a front structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear structure of this utility model; Figure 3 This is a schematic diagram of the intrinsically safe module in this utility model; Figure 4 This is a circuit diagram of the control circuit of this utility model; In the diagram: 1. Power input port; 2. High voltage processing section; 3. High frequency transformer; 4. Low voltage energy storage section; 5. Indicator light; 6. Control circuit; 7. Intrinsically safe module one; 8. Intrinsically safe module two; 9. DC output port. Detailed Implementation

[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0017] Example: A low-power, compact, dual-channel intrinsically safe power supply based on a switching power supply, refer to... Figures 1-2 As shown, the power supply enters the high-voltage processing section 2 after being input through the power input port 1. The high-voltage processing section 2 mainly consists of a fuse, surge protector, high and low frequency filter circuit, and rectifier circuit. It can process the input high-voltage AC power supply into a DC power supply suitable for the power supply and filter out interference noise in the power supply. This low-power compact dual-channel intrinsically safe protection power supply adopts a switching power supply design, is an isolated power supply, and has built-in high and low frequency filter circuit in the high-voltage processing section 2, which can effectively reduce power supply interference.

[0018] After processing, the power supply enters the control circuit 6 and the high-frequency transformer 3. The control circuit 6 is equipped with a switching power supply chip and supporting circuits. By setting different parameters, the output of the high-frequency transformer 3 can be controlled. The output of the high-frequency transformer 3 is connected to the low-voltage energy storage section 4, which can store redundant electrical energy to achieve instantaneous high current output, and also filter interference generated by electrical appliances. After the power supply is processed into a suitable DC power supply, it passes through the intrinsically safe module 1 7 and the intrinsically safe module 2 8 in sequence. The intrinsically safe module 1 7 and the intrinsically safe module 2 8 are controlled by integrated digital chips and have a self-locking function. In the event of a fault, the circuit will self-lock to prevent the continued output current from damaging the electrical equipment. The circuit can only be restored after restarting the equipment.

[0019] The structural diagrams of Intrinsically Safe Module 1.7 and Intrinsically Safe Module 2.8 are shown below. Figure 3As shown. Its specific working principle is as follows: After the AC power passes through the high-voltage processing section and the control circuit, the required DC voltage is output. After passing through the intrinsically safe module's secondary protection, a stable DC current is provided.

[0020] Level 1 overvoltage protection: When the output voltage rises above the set protection value due to a fault, the signal passes through R24 to turn on ZD5. The high-potential signal triggers Q3 to conduct, pulling up the gate control voltage of MOSFET Q10, turning off the P-type MOSFET Q10, and shutting down the output, thus achieving the protection purpose.

[0021] Level 1 overcurrent protection: The output current passes through Q10, and forms a loop with the output positive, output negative, RS1, RS2, and RS3. When the current exceeds the set protection value, the voltage drop across RS1, RS2, and RS3 reaches the protection value. The signal triggers Q7 to conduct through resistor R22, completes a trigger delay internally in U1, and outputs through pin 3 of U1. R121 and D9 trigger Q3 to conduct, turning off the P-type MOSFET Q10, thus shutting down the output and achieving the protection purpose.

[0022] Level 2 overvoltage protection: When the output voltage rises above the set protection value due to a fault, the signal passes through R25 to turn on ZD4. The high-potential signal triggers Q4 to conduct, pulling down the gate control voltage of MOSFET Q9, turning off the N-type MOSFET Q9, and shutting down the output, thus achieving the protection purpose.

[0023] Level 2 overcurrent protection: The output current passes through Q9, output -, RS1, RS2, RS3, and output + to form a loop. When the current exceeds the set protection value, and the voltage drop across RS1, RS2, and RS3 reaches the protection value, the signal triggers Q6 to conduct through resistor R20. U2 completes a trigger delay internally, and the output through pin U2-3 passes through R12 and D10 to trigger Q4 to conduct, turning off the N-type MOSFET Q9. The output is then turned off, achieving the protection purpose.

[0024] Specifically, in this invention, the control circuit 6 uses SMT technology and is soldered to the back of the intrinsically safe power supply. The switching power supply generates extremely low heat, eliminating the need for a heatsink and significantly reducing its footprint. The switching power supply control chip has built-in overcurrent protection, and the control circuit 6 includes an overvoltage protection circuit. This means the switching power supply itself has overvoltage and overcurrent protection functions, providing third-level protection when both intrinsically safe module 7 and intrinsically safe module 8 fail simultaneously, greatly increasing safety. The circuit diagram of control circuit 6 is shown below. Figure 4 As shown.

[0025] In this embodiment, the intrinsically safe module is designed as an independent module and is mounted vertically, which can significantly save the area occupied by components on the circuit board; when a fault occurs, there is no need to troubleshoot the fault, and the module can be directly replaced to achieve rapid circuit repair; the intrinsically safe module is equipped with overvoltage protection and overcurrent protection; after passing through two protection circuits, the power supply is output from the DC output port 9 to supply power to external electrical equipment. In this embodiment, the intrinsically safe power supply is equipped with an indicator light 5, which is connected to the output port and can intuitively show whether the power supply is working.

[0026] The working principle is as follows: A low-power, compact, dual-channel intrinsically safe power supply based on a switching power supply is disclosed. Power is input through the power input port 1 and then enters the high-voltage processing section 2. The high-voltage processing section 2 mainly consists of fuses, surge protectors, high- and low-frequency filter circuits, and rectifier circuits. It processes the input high-voltage AC power into a suitable DC power supply and filters out interference noise. After processing, the power enters the control circuit 6 and the high-frequency transformer 3. The control circuit 6 contains a switching power supply chip and other controllers, which control the output of the high-frequency transformer 3 by setting different parameters. The output of the high-frequency transformer 3 is connected to the low-voltage energy storage section 4, which can store redundant energy for instantaneous high-current output and filter interference from electrical appliances. After being processed into a suitable DC power supply, the power passes through intrinsically safe module 1 7 and intrinsically safe module 2 8 sequentially. After passing through two protection circuits, the power is output through the DC output port 9 to power external electrical equipment. An indicator light 5 is provided, connected to the output port, to visually indicate whether the power supply is working.

[0027] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A low-power, compact, dual-channel intrinsically safe power supply based on a switching power supply, characterized in that, It includes a power input port (1), a DC output port (9), a high-voltage processing section (2), a high-frequency transformer (3), a control circuit (6), and an intrinsically safe module; The high-voltage processing section (2) includes fuses, surge protectors, high and low frequency filter circuits, and rectifier circuits; used to process the input power supply. The control circuit (6) controls the output of the high-frequency transformer (3) by setting parameters. It includes a switching power supply control chip and supporting circuit. The intrinsically safe module is an independent module that is mounted vertically. The intrinsically safe module is equipped with overvoltage protection and overcurrent protection.

2. The low-power compact dual-channel intrinsically safe power supply according to claim 1, characterized in that, It also includes a low-voltage energy storage section (4) for storing redundant electrical energy, realizing instantaneous high current output, and filtering interference generated by electrical appliances.

3. The low-power compact dual-channel intrinsically safe power supply according to claim 1, characterized in that, The switching power supply control chip has built-in overcurrent protection.

4. The low-power compact dual-channel intrinsically safe power supply according to claim 1, characterized in that, The control circuit (6) is equipped with an overvoltage protection circuit.

5. The low-power compact dual-channel intrinsically safe power supply according to claim 1, characterized in that, The intrinsically safe module is controlled by an integrated digital chip and has a self-locking function.

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