High-power-consumption load power supply protection device for realizing intrinsically safe circuit
By designing a combination of power supply circuit module, anti-release module, temperature insurance module and electrical isolation module in a high-power load circuit, the instantaneous current demand and energy reverse discharge of high-power loads in an intrinsic safety circuit are solved, and a design that meets the intrinsic safety explosion-proof level is realized.
Patent Information
- Application Number
- CN202422069211.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In the design of intrinsic safety circuits, how to effectively meet the instantaneous current requirements of large-power loads, while avoiding reverse energy discharge and temperature rise caused by circuit failures, and thus meeting the requirements of intrinsic safety explosion-proof level.
A protective device including a power supply circuit module, a high-power load, an anti-release module, a temperature insurance module and an electrical isolation module are designed. The anti-release module prevents reverse energy leakage. The temperature safety module disconnects the power supply when the temperature exceeds the limit. The electrical isolation module isolates external communication and control ports to ensure that excessive energy is not released externally in the event of a fault.
It effectively limits the external energy release path of the high-power load circuit in the event of a fault, avoids the problems of reverse energy discharge and temperature rise, meets the requirements of inherent safety explosion-proof level, and allows the existence of large capacitors, large inductors and other components in the circuit, improving the flexibility and safety of the design.
Smart Images
Figure CN223039646U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of circuit protection, and provides a power supply protection device for large-power loads that realizes an intrinsically safe circuit. Background Art
[0002] At present, in explosion-proof electronic products adopting the intrinsically safe circuit design method, for loads with large instantaneous power consumption, such as those that require a relatively large instantaneous current (2A / 50uS). For such loads in the circuit, a large-capacity (1000uF) capacitor can be placed nearby to provide the instantaneous large current nearby to meet the demand. However, in the design to meet the intrinsically safe explosion-proof form, such as ExibIICT6 level, the capacitor is restricted to be below 5V voltage and the capacitance value is required to be less than 100uF. Subtracting the capacitance value of the remaining circuits in the product, it is impossible to increase a larger capacitor here to meet the above demand.
[0003] For traditional practices, for such large-power loads, the following methods are available during design:
[0004] 1) Limit the current and amplify the safety barrier that supplies power to it to meet the working requirements of the subsequent load.
[0005] 2) Divide the safety barrier into multiple paths to limit the current and then supply power to the large load simultaneously.
[0006] 3) Under a certain intrinsically safe level, large-power loads cannot meet the intrinsically safe design.
[0007] The above methods will bring the following problems:
[0008] 1) After the safety barrier limits the current and amplifies, its output power is large, which brings difficulties to the control of the dissipation power and temperature rise of the safety barrier and the components in the subsequent circuit. And it may not be able to meet the intrinsically safe design requirements.
[0009] 2) Dividing the safety barrier into multiple paths to limit the current can solve the safety barrier design problem. However, when supplying power to a large-power load together, there are also difficulties in controlling the dissipation power and temperature rise of the components in the subsequent circuit. And it may not be able to meet the intrinsically safe design requirements.
[0010] 3) It causes the product itself to not meet the required intrinsically safe explosion-proof level, thus restricting the realization of the product's functions and resulting in the failure of the product's explosion-proof design. Summary of the Utility Model
[0011] Aiming at the problems existing in the prior art, a power supply protection device for large-power loads that realizes an intrinsically safe circuit is provided. Through measures such as temperature, anti-reverse discharge, and electrical isolation, it can solve the requirements for the intrinsically safe explosion-proof circuit design when there are components such as large-power loads and large-capacity capacitors in the circuit.
[0012] The technical solution adopted by the present utility model is as follows: A power supply protection device for a high-power load to achieve intrinsically safe circuits, including a connected power supply circuit module and a high-power load. The power supply circuit module is connected to the power input port provided by the safety barrier, receives external input power, and provides the power required by the high-power load. It also includes an anti-reverse leakage and return module, which is arranged on the line between the power supply circuit module and the power input port, and is used to prevent the excessive energy in the circuit from being released externally in reverse through the power input port in case of a fault.
[0013] As a preferred solution, it also includes a thermal fuse module, which is arranged on the line between the power supply circuit module and the anti-reverse leakage and discharge module, and is used to cut off the external power supply when the temperature exceeds the fuse temperature value.
[0014] As a preferred solution, it also includes a thermal fuse module, which is arranged on the line between the power input port and the anti-reverse leakage and discharge module, and is used to cut off the external power supply when the temperature exceeds the fuse temperature value.
[0015] As a preferred solution, it also includes an electrical isolation module, which is arranged between the high-power load and the external circuit, and is used to isolate the external communication and control ports in the circuit where the high-power load is located from the external circuit.
[0016] As a preferred solution, the power supply circuit module, the high-power load, the thermal fuse module, and the electrical isolation module are integrated on a circuit board.
[0017] As a preferred solution, the circuit board formed integrally by the power supply circuit module, the high-power load, the thermal fuse module, and the electrical isolation module is subjected to potting treatment, and only external interfaces are provided to complete the interconnection.
[0018] As a preferred solution, the thermal fuse module is implemented by a thermal fuse.
[0019] As a preferred solution, the anti-reverse leakage and return module is implemented by a diode. The positive pole of the diode is connected to the power input port, and the negative pole of the diode is connected to the power supply circuit module.
[0020] As a preferred solution, the electrical isolation module is implemented by an optocoupler.
[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows: By restricting all possible external energy release paths of the circuit where the high-power load is located, the entire high-power load circuit cannot release excessive energy to the external environment when there is a fault in the circuit, thereby meeting the requirements of intrinsically safe explosion protection. And under the treatment measures, when designing the high-power load circuit, there can be energy storage devices such as large capacitors and large inductors that exceed the explosion protection level requirements to supply power to the high-power load instantaneously, which can also meet the intrinsically safe circuit design. Moreover, the safety barrier can limit the current to a smaller value. After the output power is reduced, the difficulty of controlling the dissipation power and temperature rise of the devices in the subsequent circuit can be further reduced, reducing the difficulty of intrinsically safe circuit design and increasing the probability of successfully implementing the intrinsically safe circuit design. Description of the Drawings
[0022] Figure 1 Schematic diagram of a power supply protection device for a high-power load to achieve an intrinsically safe circuit proposed by the present utility model. Detailed Embodiments
[0023] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar modules or modules with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application. On the contrary, the embodiments of the present application include all changes, modifications, and equivalents that fall within the spirit and scope of the appended claims.
[0024] In order to meet the requirements of intrinsically safe explosion-proof circuit design when there are components such as high-power loads and large-capacitance capacitors in the circuit, the present utility model proposes a power supply protection device for a high-power load to achieve an intrinsically safe circuit, which can meet the requirements of intrinsically safe design.
[0025] Please refer to Figure 1 , the power supply protection device for the high-power load includes a connected power supply circuit module and a high-power load. The power supply circuit module is connected to the power input port of the safety barrier, receives the external input power supply, and provides the power required by the high-power load. It also includes an anti-reverse leakage module, which is arranged on the line between the power supply circuit module and the power input port, and is used to prevent the excessive energy in the circuit from being released reversely to the outside through the power input port in case of a fault.
[0026] By making a design to prevent reverse leakage for the power supply port of the power supply circuit module that supplies power to the high-power load. Prevent the excessive energy in the circuit from being released reversely to the outside through the power supply port in case of a fault.
[0027] In this embodiment, a temperature fuse module is further included. It can be disposed on the line between the power supply circuit module and the reverse leakage prevention and discharge module, or on the line between the power input port and the reverse leakage prevention and discharge module. When the temperature exceeds its fuse temperature value, the external power supply is disconnected to prevent the temperature from rising further. In one embodiment, the temperature fuse module is implemented by a temperature fuse. By utilizing the temperature protection function of the temperature fuse, when the circuit temperature rises beyond the limit temperature requirement due to a circuit fault, the external power supply of the circuit is cut off, thereby restricting the temperature from continuing to rise beyond the temperature limit requirement of the intrinsically safe circuit temperature group.
[0028] In one embodiment, the reverse leakage prevention and discharge module is implemented by a diode. The positive pole of the diode is connected to the power input port, and the negative pole of the diode is connected to the power supply circuit module. In a preferred embodiment, the diode model is 1N4007.
[0029] Furthermore, the large-power load power supply protection device proposed in this embodiment further includes an electrical isolation module, which is disposed between the large-power load and the external circuit. The electrical isolation module is used to isolate the electrical connection between the external communication and control ports in its own circuit and the external circuit, preventing the excessive energy in the circuit from being released to the outside through these ports in the event of a circuit fault and causing damage to the external circuit. In one embodiment, the electrical isolation module is implemented by an optocoupler, and the isolation between the large-power load and the external circuit is achieved through optoelectronic coupling.
[0030] In one embodiment, the power supply circuit module, the large-power load, the temperature fuse module, and the electrical isolation module are integrated on a circuit board. By performing an overall potting treatment on the circuit board where the power supply circuit module, the large-power load, the temperature fuse module, and the isolation module are located, it is possible to prevent the release of excess energy to the outside in the event of a circuit fault, and at the same time restrict the high temperature that may be generated during a fault from being released to the external environment before the temperature fuse provides protection, thereby igniting the potentially explosive combustible gas that may exist, thus meeting the intrinsically safe design requirements.
[0031] The present utility model performs reverse leakage prevention and isolation processing on the external power input interface, communication, and control pins of the large-power load and its power supply circuit module, as well as potting treatment on the overall circuit and uses a temperature fuse to protect the temperature rise of the overall circuit, so that the overall circuit meets the intrinsically safe explosion-proof design standard. The key technical points to be protected are the combination of the above several processing methods, enabling the overall circuit components to meet the intrinsically safe explosion-proof design standard. It allows the large-power load circuit to meet the intrinsically safe design in the presence of large capacitors and large inductors that exceed the allowable explosion-proof level standard. Thus, it enriches the explosion-proof product functions of the intrinsically safe design and broadens the space for product function design.
[0032] It should be noted that in the description of the embodiments of the present utility model, unless otherwise clearly specified and defined, the terms "arranged" 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 direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.
[0033] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.
Claims
1. A high power consumption load power supply protection device for realizing an intrinsically safe circuit, characterized in that: It includes a connected power supply circuit module and a large power consumption load, wherein the power supply circuit module is connected to a power input port provided by a safety barrier, receives an external input power supply, and provides the power required by the large power consumption load; and also includes an anti-reverse leakage module, which is arranged on the line between the power supply circuit module and the power input port, and is used to prevent the energy exceeding the limit in the circuit from being released in reverse through the power input port in the event of a fault.
2. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 1, characterized in that: It also includes a temperature insurance module, which is arranged on the line between the power supply circuit module and the anti-reverse discharge module and is used to disconnect the external power supply when the temperature exceeds the insurance temperature value.
3. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 1, characterized in that: It also includes a temperature insurance module, which is arranged on the line between the power input port and the anti-reverse discharge module and is used to disconnect the external power supply when the temperature exceeds the insurance temperature value.
4. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to any one of claims 1 to 3, characterized in that: It also includes an electrical isolation module, which is arranged between the high-power consumption load and the external circuit and is used to isolate the external communication and control ports in the circuit where the high-power consumption load is located from the external circuit.
5. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 4, characterized in that: The power supply circuit module, the high power consumption load, the temperature insurance module and the electrical isolation module are integrated on a circuit board.
6. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 5, characterized in that: The circuit board formed by the power supply circuit module, the high power consumption load, the temperature insurance module and the electrical isolation module is potted, and only an external interface is provided to complete the interconnection.
7. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 2, characterized in that: The temperature insurance module is implemented by a temperature fuse.
8. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 1, characterized in that: The anti-reverse leakage module is implemented by a diode, the anode of the diode is connected to the power input port, and the cathode of the diode is connected to the power supply circuit module.
9. The high power consumption load power supply protection device for realizing an intrinsically safe circuit according to claim 4, characterized in that: The electrical isolation module is implemented by using an optical coupler.