Passive protection device compatible with various voltage classes

Abstract

The utility model discloses a passive protection device compatible with various voltage classes, and relates to the technical field of protection circuits. The utility model relates to a power supply control circuit, which comprises a switch module, a power supply conversion module, a boost module, a voltage regulation module, an energy storage element, a relay, a main control module and a voltage feedback module, the input end of the switch module is connected with an input power supply, the output end of the switch module is electrically connected with the input end of the power supply conversion module, and the output end of the power supply conversion module is electrically connected with the input end of the boost module. The output end of the boosting module is electrically connected with the input end of the voltage regulating module, the output end of the voltage regulating module is electrically connected with the energy storage element, the power supply end of the relay is electrically connected with the energy storage element, the output end of the relay is electrically connected with the trip coil, and the main control module is electrically connected with the driving end of the relay; the input end of the voltage feedback module is electrically connected with the energy storage element, and the output end of the voltage feedback module is electrically connected with the controlled end of the switch module. The device can meet various different voltage levels in a low-cost mode.

Description

Technical Field

[0001] The utility model relates to the technical field of protection circuits, in particular to a passive protection device compatible with multiple voltage levels. Background Art

[0002] With the continuous development of the power industry, the use of passive protection devices is very common. Its main function is to collect current on the transmission line. When there is a fault phenomenon such as overcurrent, the internal relay of the protection device will be activated and the active voltage will be output to drive the tripping electromagnet outside the device to operate and realize the overcurrent tripping function. The voltage of the tripping electromagnet usually has four voltage levels: DC 24V, 48V, 110V and 220V, so the protection device needs to design four sets of power supply circuits with corresponding voltage levels. Manufacturers need to design and produce 4 different power boards to meet different application scenarios, which is costly and difficult to manage and maintain. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a passive protection device compatible with multiple voltage levels, which can meet the requirements of multiple different tripping voltage levels in a low-cost manner.

[0004] According to an embodiment of the utility model, a passive protection device compatible with multiple voltage levels includes:

[0005] A switch module, wherein an input end of the switch module is connected to an input power supply;

[0006] A power conversion module, the input end of which is electrically connected to the output end of the switch module, and is used to convert the input power into an AC voltage;

[0007] A boost module, the input end of which is electrically connected to the output end of the power conversion module, and is used to boost the AC voltage;

[0008] A voltage regulating module, the input end of which is electrically connected to the output end of the boost module, and is used to convert the boosted AC voltage into a DC voltage of the voltage level required by the trip coil;

[0009] An energy storage element, electrically connected to the output end of the voltage regulating module;

[0010] A relay, wherein a power supply end of the relay is electrically connected to the energy storage element, and an output end of the relay is electrically connected to the trip coil;

[0011] A main control module, electrically connected to the driving end of the relay;

[0012] A voltage feedback module, wherein an input end of the voltage feedback module is electrically connected to the energy storage element, and an output end of the voltage feedback module is electrically connected to a controlled end of the switch module.

[0013] According to some embodiments of the utility model, the switching module includes a power switch, the input end of the power switch is electrically connected to the input power supply through a first filtering unit, the controlled end of the power switch is electrically connected to the output end of the voltage feedback module, the output end of the power switch is electrically connected to the input end of the power conversion module, and the power switch is also provided with an overcurrent protection pin, the overcurrent protection pin is connected to a first pull-down resistor, and the overcurrent protection pin is used to set the maximum current allowed to be output by the power switch.

[0014] According to some embodiments of the utility model, the power conversion module includes a DC-to-AC chip, the input end of the DC-to-AC chip is electrically connected to the output end of the switch module through a second filtering unit, the output end of the DC-to-AC chip is electrically connected to the input end of the boost module, the clock pin of the DC-to-AC chip is connected to a second pull-down resistor and a filter capacitor connected in parallel, and the clock pin of the DC-to-AC chip is used to set the frequency of the AC power output by the DC-to-AC chip.

[0015] According to some embodiments of the utility model, the boost module includes an isolation transformer, the isolation transformer includes a primary coil and a secondary coil, the secondary coil is provided with an intermediate tap, the intermediate tap divides the secondary coil into a first secondary winding and a second secondary winding, the primary coil is electrically connected to the output end of the power conversion module, and the secondary coil is electrically connected to the input end of the voltage regulation module.

[0016] According to some embodiments of the utility model, when the voltage level required by the trip coil is 24V, the voltage regulating module includes a first diode, a first capacitor and a second diode, the cathode of the first diode is electrically connected to the output end of the first secondary winding, one end of the first capacitor is electrically connected to the output end of the intermediate tap, the cathode of the second diode is electrically connected to the output end of the second secondary winding, the anode of the first diode, the other end of the first capacitor and the anode of the second diode are connected to each other, the output end of the intermediate tap is also electrically connected to the positive electrode of the energy storage element through a first current limiting resistor, and the other end of the first capacitor is electrically connected to the negative electrode of the energy storage element.

[0017] According to some embodiments of the utility model, when the voltage level required by the trip coil is 48V, the voltage regulating module includes a second capacitor and a third diode, one end of the second capacitor is electrically connected to the output end of the first secondary winding, the other end of the second capacitor is electrically connected to the anode of the third diode, and the cathode of the third diode is electrically connected to the output end of the second secondary winding; the output end of the first secondary winding is also electrically connected to the positive electrode of the energy storage element through a second current limiting resistor, and the connection point between the second capacitor and the third diode is electrically connected to the negative electrode of the energy storage element.

[0018] According to some embodiments of the utility model, when the voltage level required by the trip coil is 110V, the voltage regulating module includes the second capacitor, the third diode, the third capacitor and the fourth diode, one end of the second capacitor is electrically connected to the output end of the first secondary winding, the other end of the second capacitor is electrically connected to the anode of the third diode, the cathode of the third diode is electrically connected to the output end of the second secondary winding, the cathode of the fourth diode is electrically connected to the other end of the second capacitor, the anode of the fourth diode is electrically connected to one end of the third capacitor, and the other end of the third capacitor is electrically connected to the cathode of the third diode; the output end of the second secondary winding is also electrically connected to the positive electrode of the energy storage element through a third current limiting resistor, and the connection point between the third capacitor and the fourth diode is electrically connected to the negative electrode of the energy storage element.

[0019] According to some embodiments of the utility model, when the voltage level required by the trip coil is 220V, the voltage regulating module includes the second capacitor, the third diode, the third capacitor, the fourth diode, the fourth capacitor, the fifth diode, the sixth diode and the fifth capacitor, one end of the second capacitor is electrically connected to the output end of the first secondary winding, the other end of the second capacitor is electrically connected to the anode of the third diode, the cathode of the third diode is electrically connected to the output end of the second secondary winding, the cathode of the fourth diode is electrically connected to the other end of the second capacitor, the anode of the fourth diode is electrically connected to one end of the third capacitor, and the other end of the third capacitor is electrically connected to the anode of the fourth diode. The output end of the second secondary winding is electrically connected to the positive electrode of the energy storage element through the third current limiting resistor, and the connection point between the sixth diode and the fifth capacitor is electrically connected to the negative electrode of the energy storage element.

[0020] According to some embodiments of the utility model, the voltage feedback module includes a fourth current limiting resistor, a TVS diode and a photocoupler, one end of the fourth current limiting resistor is electrically connected to the positive electrode of the energy storage element, the other end of the fourth current limiting resistor is electrically connected to the cathode of the TVS diode, the anode of the TVS diode is electrically connected to the input end of the photocoupler, and the output end of the photocoupler is electrically connected to the controlled end of the switch module.

[0021] According to some embodiments of the utility model, the main control module is electrically connected to the driving end of the relay through a driving module, the driving module includes an inverter and a transistor, the input end of the inverter is electrically connected to the main control module, the output end of the inverter is electrically connected to the base of the transistor, the emitter of the transistor is grounded, and the collector of the transistor is electrically connected to the driving end of the relay.

[0022] The passive protection device compatible with multiple voltage levels according to the embodiment of the utility model has at least the following beneficial effects: the voltage is adjusted by the voltage regulating module to obtain the required tripping power supply voltage, and multiple different tripping voltage level power supplies can be output, the voltage level is convenient to adjust, and no complex devices are required, the circuit is simple, and the circuit cost is low. A circuit board can be compatible with multiple voltage levels, saving production costs and facilitating maintenance.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 A schematic diagram of a module of a passive protection device compatible with multiple voltage levels according to an embodiment of the utility model;

[0026] Figure 2 This is a circuit schematic diagram of a passive protection device compatible with multiple voltage levels according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0027] Embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limitations on the present application. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 a limitation on the present invention.

[0029] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the utility model and the drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0030] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] With the continuous development of the power industry, the use of passive protection devices is very common. Its main function is to collect current on the transmission line. When there is a fault phenomenon such as overcurrent, the internal relay of the protection device will be activated and the active voltage will be output to drive the tripping electromagnet outside the device to operate and realize the overcurrent tripping function. The voltage of the tripping electromagnet usually has four voltage levels: DC 24V, 48V, 110V and 220V, so the protection device needs to design four sets of power supply circuits with corresponding voltage levels. Manufacturers need to design and produce 4 different power boards to meet different application scenarios, which is costly and difficult to manage and maintain.

[0032] In meeting the requirements of various tripping power supply voltage levels, the following problems are often encountered: First, in order to design different power supply levels, different circuits are used, which is troublesome to design and difficult to maintain. Second, the circuits used are complex and costly.

[0033] To this end, the present invention provides a passive protection device compatible with multiple voltage levels, such as Figure 1 As shown, the device includes a switch module 200, a power conversion module 300, a boost module 400, a voltage regulating module 500, an energy storage element 600, a relay 700, a main control module 900 and a voltage feedback module 1000, wherein the input end of the switch module 200 is connected to the input power supply 100, the output end of the switch module 200 is electrically connected to the input end of the power conversion module 300, the output end of the power conversion module 300 is electrically connected to the input end of the boost module 400, and the boost module 400 The output end of the voltage regulator module 500 is electrically connected to the input end of the voltage regulator module 500, the output end of the voltage regulator module 500 is electrically connected to the energy storage element 600, the power supply end of the relay 700 is electrically connected to the energy storage element 600, the output end of the relay 700 is electrically connected to the trip coil 800, and the main control module 900 is electrically connected to the driving end of the relay 700; the input end of the voltage feedback module 1000 is electrically connected to the energy storage element 600, and the output end of the voltage feedback module 1000 is electrically connected to the controlled end of the switch module 200. The power conversion module 300 is used to convert the input power into an AC voltage, the boost module 400 is used to boost the AC voltage, and the voltage regulator module 500 is used to convert the boosted AC voltage into a DC voltage of the voltage level required by the trip coil 800.

[0034] Specifically, the power supply of the trip coil 800 is obtained by boosting the input power supply 100 inside the passive protection device. After the input power supply 100 passes through the switch module 200 to the power conversion module 300, it is converted into an AC voltage. After the AC voltage is boosted by the boost module 400, it is converted into a DC voltage of the voltage level required by the trip coil 800 by the voltage regulating module 500, and then the energy is stored in the energy storage element 600. The switch module 200 is fed back the voltage of the energy storage element 600 by the voltage feedback module 1000. After reaching the required trip voltage, the voltage feedback module 1000 turns off the switch module 100 and stops storing energy in the energy storage element 600. The trip coil 800 is an external device of the passive protection device and is controlled by the relay 700 inside the passive protection device. The energy storage element 600 outputs the output power to the trip coil 800 through the relay 700 to realize the tripping function.

[0035] like Figure 2 As shown, in some embodiments of the utility model, the input power supply 100 provides a 5V DC voltage. The switch module 200 includes a power switch U6, the input end (i.e., pin 5) of the power switch U6 is electrically connected to the input power supply through the first filtering unit, the controlled end (i.e., pin 4) of the power switch U6 is electrically connected to the output end of the voltage feedback module 1000, the output end (i.e., pin 1) of the power switch U6 is electrically connected to the input end of the power conversion module 300, and the power switch U6 is also provided with an overcurrent protection pin (i.e., pin 3), the overcurrent protection pin is connected to the first pull-down resistor R35, and the overcurrent protection pin is used to set the maximum current allowed to be output by the power switch U6. Specifically, the first filtering unit includes a magnetic bead B2 and capacitors C29 and C30, the input power supply +5V is filtered out of high-frequency clutter by the magnetic bead B2, and then filtered by capacitors C29 and C30, and then input to the power switch U6, the third pin of the power switch U6 is externally connected to the first pull-down resistor R35, which is used to set the maximum current allowed to be output, and plays an overcurrent protection role.

[0036] like Figure 2As shown, in some embodiments of the utility model, the power conversion module 300 includes a DC to AC chip U2, the input end (i.e., pin 2) of the DC to AC chip U2 is electrically connected to the output end of the switch module 200 through the second filtering unit, the output end (i.e., pins 5 and 8) of the DC to AC chip U2 is electrically connected to the input end of the boost module 400, and the clock pin (i.e., pin 1) of the DC to AC chip U2 is connected to a second pull-down resistor R29 and a filter capacitor C28 connected in parallel with each other, and the clock pin of the DC to AC chip U2 is used to set the frequency of the DC to AC chip U2 outputting the alternating current. Specifically, the second filtered power supply includes capacitors C22 and C23, and after the 5V power supply comes out of the power switch U6, it is filtered by capacitors C22 and C23 and then enters the DC to AC chip U2. The first pin of the DC to AC chip U2 is externally connected to the second pull-down resistor R29 and the filter capacitor C28, which are used to set the frequency of the output alternating current. The 5 and 8 pins of the DC to AC chip U2 output alternating current to the boost module 400.

[0037] like Figure 2 As shown, in some embodiments of the present utility model, the boost module 400 includes an isolation transformer T1, the isolation transformer T1 includes a primary coil and a secondary coil, the secondary coil is provided with an intermediate tap, the intermediate tap divides the secondary coil into a first secondary winding and a second secondary winding, the primary coil is electrically connected to the output end of the power conversion module 300, and the secondary coil is electrically connected to the voltage regulation module 400. In this example, the primary coil and the secondary coil turns ratio of the isolation transformer T1 is 10:55+55, the secondary coil has an intermediate tap, and 55 turns on each side of the intermediate tap. The 5V AC output from the DC to AC chip U2 is amplified by about 5.5 times through the isolation transformer T1.

[0038] like Figure 2 As shown, in some embodiments of the present invention, the energy storage element 600 includes an energy storage capacitor EC2, and three current limiting resistors R1, R2 and R3 are connected between the positive electrode of the energy storage capacitor EC2 and the two ends (ST1, ST2) and the middle tap (T) of the secondary coil of the isolation transformer T1.

[0039] When the voltage level required by the trip coil 800 is 24V, Figure 2As shown, the voltage regulating module 500 includes a first diode D1, a first capacitor C8 and a second diode D6, the cathode of the first diode D1 is electrically connected to the output end ST1 of the first secondary winding, one end of the first capacitor C8 is electrically connected to the output end T of the middle tap, the cathode of the second diode D6 is electrically connected to the output end ST2 of the second secondary winding, the anode of the first diode D1, the other end of the first capacitor C8 and the anode of the second diode D6 are connected to each other, the output end T of the middle tap is also electrically connected to the positive electrode of the energy storage element (i.e., the energy storage capacitor EC2) through the first current limiting resistor R1, and the other end of the first capacitor C8 is electrically connected to the negative electrode of the energy storage element. The 5V AC power output from the DC-to-AC chip U2 is amplified by about 5.5 times through the isolation transformer T1. After the AC power comes out of the isolation transformer T1, the two ends of the secondary coil ST1 and ST2 are connected to the first diode D1 and the second diode D6 respectively, and the middle tap is connected to the first capacitor C8 to form a full-wave rectification circuit. A DC power supply of about 27.5V is obtained at both ends of the first capacitor C8, which can be suitable for the trip coil 800 that requires a voltage level of 24V.

[0040] When the voltage level required by the trip coil 800 is 48V, Figure 2 As shown, the voltage regulating module 500 includes a second capacitor C6 and a third diode D2, one end of the second capacitor C6 is electrically connected to the output end ST1 of the first secondary winding, the other end of the second capacitor C6 is electrically connected to the anode of the third diode D2, and the cathode of the third diode D2 is electrically connected to the output end ST2 of the second secondary winding; the output end ST1 of the first secondary winding is also electrically connected to the positive electrode of the energy storage element through the second current limiting resistor R2, and the connection point between the second capacitor C6 and the third diode D2 is electrically connected to the negative electrode of the energy storage element. After the AC power comes out from the two ends ST1 and ST2 of the isolation transformer T1, it is connected to the half-wave rectifier circuit composed of the second capacitor C6 and the third diode D2, and a DC power supply of about 55V can be obtained at the two ends of the second capacitor C6, which can be applied to the tripping coil 800 requiring a voltage level of 48V.

[0041] When the voltage level required by the trip coil 800 is 110V, Figure 2As shown, the voltage regulating module 500 includes a second capacitor C6, a third diode D2, a third capacitor C9 and a fourth diode D3, one end of the second capacitor C6 is electrically connected to the output end ST1 of the first secondary winding, the other end of the second capacitor C6 is electrically connected to the anode of the third diode D2, the cathode of the third diode D2 is electrically connected to the output end ST2 of the second secondary winding, the cathode of the fourth diode D3 is electrically connected to the other end of the second capacitor C6, the anode of the fourth diode D3 is electrically connected to one end of the third capacitor C9, and the other end of the third capacitor C9 is electrically connected to the cathode of the third diode D2; the output end ST2 of the second secondary winding is also electrically connected to the positive electrode of the energy storage element through the third current limiting resistor R3, and the connection point between the third capacitor C9 and the fourth diode D3 is electrically connected to the negative electrode of the energy storage element. After the AC power supply comes out from the two ends ST1 and ST2 of the isolation transformer T1, it is connected to a half-wave voltage doubler rectifier circuit composed of a second capacitor C6, a third capacitor C9, a third diode D2, and a fourth diode D3. The third capacitor C9 is doubled based on the second capacitor C6, and a DC power supply of about 110V can be obtained at both ends of the third capacitor C9, which can be suitable for a trip coil 800 that requires a voltage level of 110V.

[0042] When the voltage level required by the trip coil 800 is 220V, Figure 2As shown, the voltage regulating module 500 includes a second capacitor C6, a third diode D2, a third capacitor C9, a fourth diode D3, a fourth capacitor C7, a fifth diode D4, a sixth diode D5 and a fifth capacitor C10, one end of the second capacitor C6 is electrically connected to the output end ST1 of the first secondary winding, the other end of the second capacitor C6 is electrically connected to the anode of the third diode D2, the cathode of the third diode D2 is electrically connected to the output end ST2 of the second secondary winding, the cathode of the fourth diode D3 is electrically connected to the other end of the second capacitor C6, the anode of the fourth diode D3 is electrically connected to one end of the third capacitor C9, the other end of the third capacitor C9 is electrically connected to the anode of the third diode D2 The cathode of the second secondary winding is electrically connected, one end of the fourth capacitor C7 is electrically connected to the other end of the second capacitor C6, the other end of the fourth capacitor C7 is electrically connected to the anode of the fifth diode D4, the cathode of the fifth diode D4 is electrically connected to one end of the third capacitor C9, the cathode of the sixth diode D5 is electrically connected to the other end of the fourth capacitor C7, the anode of the sixth diode D5 is electrically connected to one end of the fifth capacitor C10, and the other end of the fifth capacitor C10 is electrically connected to one end of the third capacitor C9; the output end ST2 of the second secondary winding is electrically connected to the positive electrode of the energy storage element through the third current limiting resistor R3, and the connection point of the sixth diode D5 and the fifth capacitor C10 is electrically connected to the negative electrode of the energy storage element. The AC power supply comes out from the ST1 and ST2 ends of the isolation transformer T1, and is connected to the half-wave voltage doubling rectifier circuit composed of the second capacitor C6, the third capacitor C9, the fourth capacitor C7, the fifth capacitor C10 and the third diode D2, the fourth diode D3, the fifth diode D4 and the sixth diode D5. Similarly, a DC power supply of about 110V can be obtained at both ends of the fifth capacitor C10. One end of the third capacitor C9 connected to ST2 of the isolation transformer T2 is the positive electrode, and the negative electrode of the third capacitor C9 is connected to the positive electrode of the fifth capacitor C10, which is equivalent to the superposition of the power supplies of the third capacitor C9 and the fifth capacitor C10. A DC power supply of approximately 220V can be obtained on the left side of the third capacitor C9 and the right side of the fifth capacitor C10, which is suitable for a trip coil 800 that requires a voltage level of 220V.

[0043] In practical applications, a passive protection device only needs one tripping power supply, DC 24V, 48V, 110V or 220V. In this design, four tripping power supplies are compatible, and the required power supply can be obtained by welding or air welding of components. Three current limiting resistors R1, R2, and R3 are connected between the positive electrode of the energy storage capacitor EC2 and the two ends and the middle tap of the secondary coil of the isolation transformer T1.

[0044] 1. When a 24V tripping power supply is required, weld the first current limiting resistor R1, and use the middle tap as the positive electrode of the energy storage capacitor EC2. Weld C8, D1, and D6, and the three devices form a full-wave rectifier circuit. The positive electrodes of the two diodes are connected to C8 as the negative electrode of the energy storage capacitor EC2.

[0045] 2. When a 48V tripping power supply is required, weld the second current limiting resistor R2, and the ST1 end of the secondary coil serves as the positive electrode of the energy storage capacitor EC2. Weld C6 and D2, and the two devices form a half-wave rectifier circuit. The end connected to C6 and D2 serves as the negative electrode of the energy storage capacitor EC2.

[0046] 3. When a 110V tripping power supply is required, weld the third current limiting resistor R3. The ST2 end of the secondary coil serves as the positive electrode of the energy storage capacitor EC2. Weld C6, D2, C9, and D3, and the four devices form a primary voltage doubler rectifier circuit. The connection point between C9 and D3 serves as the negative electrode of the energy storage capacitor EC2.

[0047] 4. When a 220V tripping power supply is required, weld the third current limiting resistor R3. The ST2 end of the secondary coil serves as the positive electrode of the energy storage capacitor EC2. Weld C6, D2, C9, D3, C7, D4, C10, and D5. The eight devices form a three-stage voltage doubling rectifier circuit. The connection point of C10 and D5 serves as the negative electrode of the energy storage capacitor EC2.

[0048] Furthermore, if Figure 2 As shown, in some embodiments of the present utility model, the voltage feedback module 1000 includes a fourth current limiting resistor R36, a TVS diode DZ1 and a photocoupler U9, one end of the fourth current limiting resistor R36 is electrically connected to the positive electrode of the energy storage element, the other end of the fourth current limiting resistor R36 is electrically connected to the cathode of the TVS diode DZ1, the anode of the TVS diode DZ1 is electrically connected to the input end of the photocoupler U9, and the output end of the photocoupler U9 is electrically connected to the controlled end of the switch module 200. Among them, the selection of TVS diode DZ1 is optional, corresponding to the required 4 tripping voltages. When the energy storage capacitor EC2 reaches the required voltage, the TVS diode DZ1 is broken down, the photocoupler U9 is turned on, the 4th pin of the power switch U6 is pulled low, U6 stops outputting, and the energy storage capacitor EC2 stops boosting. When the voltage of the energy storage capacitor EC2 is lower than the breakdown voltage of the TVS diode DZ1, the photocoupler U9 is turned off, the power switch U6 starts to work, and the voltage of the energy storage capacitor EC2 increases. The voltage feedback module 1000 feeds back the voltage of the energy storage capacitor EC2 in real time to maintain the capacitor voltage within the required range.

[0049] Furthermore, if Figure 2As shown, in some embodiments of the present invention, the main control module 900 is electrically connected to the driving end of the relay RLY1 through the driving module, and the driving module includes an inverter U5F and a transistor Q3. The input end (KC_3) of the inverter U5F is electrically connected to the main control module 900, and the output end of the inverter U5F is electrically connected to the base of the transistor Q3 through a resistor R18. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is electrically connected to the driving end of the relay RLY1. Among them, the main control module 900 is a single-chip microcomputer of the passive protection device. When the device collects that there is an excessive current on the line, the single-chip microcomputer of the device sends a signal KC_3. KC3 turns on the transistor Q3 after passing through the inverter U5F, driving the relay RLY1 to operate, and the power supply of the energy storage capacitor EC2 is output to the tripping coil 800 through the relay contact to complete the tripping action.

[0050] According to the passive protection device compatible with multiple voltage levels of the embodiment of the utility model, it is possible to output multiple different trip voltage level power supplies without the need for complex devices, the circuit is simple, and the circuit cost is low. The voltage is adjusted by the voltage regulating module 500 to obtain the required trip power supply voltage, and the voltage level is easy to adjust. A circuit board can be compatible with multiple voltage levels, saving production costs and facilitating maintenance. At the same time, the circuit has overvoltage and overcurrent protection, which is safe and reliable.

[0051] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A passive protection device compatible with multiple voltage levels, characterized in that: include: A switch module, wherein an input end of the switch module is connected to an input power supply; A power conversion module, the input end of which is electrically connected to the output end of the switch module, and is used to convert the input power into an AC voltage; A boost module, the input end of which is electrically connected to the output end of the power conversion module, and is used to boost the AC voltage; A voltage regulating module, the input end of which is electrically connected to the output end of the boost module, and is used to convert the boosted AC voltage into a DC voltage of the voltage level required by the trip coil; An energy storage element, electrically connected to the output end of the voltage regulating module; A relay, wherein a power supply end of the relay is electrically connected to the energy storage element, and an output end of the relay is electrically connected to the trip coil; A main control module, electrically connected to the driving end of the relay; A voltage feedback module, wherein an input end of the voltage feedback module is electrically connected to the energy storage element, and an output end of the voltage feedback module is electrically connected to a controlled end of the switch module.

2. The passive protection device compatible with multiple voltage levels according to claim 1, characterized in that: The switch module includes a power switch, the input end of the power switch is electrically connected to the input power supply through a first filtering unit, the controlled end of the power switch is electrically connected to the output end of the voltage feedback module, the output end of the power switch is electrically connected to the input end of the power conversion module, and the power switch is also provided with an overcurrent protection pin, the overcurrent protection pin is connected to a first pull-down resistor, and the overcurrent protection pin is used to set the maximum current allowed to be output by the power switch.

3. The passive protection device compatible with multiple voltage levels according to claim 1, characterized in that: The power conversion module includes a DC-to-AC chip, the input end of the DC-to-AC chip is electrically connected to the output end of the switch module through a second filtering unit, the output end of the DC-to-AC chip is electrically connected to the input end of the boost module, and the clock pin of the DC-to-AC chip is connected to a second pull-down resistor and a filtering capacitor connected in parallel with each other. The clock pin of the DC-to-AC chip is used to set the frequency of the AC power output by the DC-to-AC chip.

4. The passive protection device compatible with multiple voltage levels according to claim 1, characterized in that: The boost module includes an isolation transformer, which includes a primary coil and a secondary coil. The secondary coil is provided with an intermediate tap, and the intermediate tap divides the secondary coil into a first secondary winding and a second secondary winding. The primary coil is electrically connected to the output end of the power conversion module, and the secondary coil is electrically connected to the input end of the voltage regulation module.

5. The passive protection device compatible with multiple voltage levels according to claim 4, characterized in that: When the voltage level required by the trip coil is 24V, the voltage regulating module includes a first diode, a first capacitor and a second diode, the cathode of the first diode is electrically connected to the output end of the first secondary winding, one end of the first capacitor is electrically connected to the output end of the intermediate tap, the cathode of the second diode is electrically connected to the output end of the second secondary winding, the anode of the first diode, the other end of the first capacitor and the anode of the second diode are connected to each other, the output end of the intermediate tap is also electrically connected to the positive electrode of the energy storage element through a first current limiting resistor, and the other end of the first capacitor is electrically connected to the negative electrode of the energy storage element.

6. The passive protection device compatible with multiple voltage levels according to claim 4, characterized in that: When the voltage level required by the trip coil is 48V, the voltage regulating module includes a second capacitor and a third diode, one end of the second capacitor is electrically connected to the output end of the first secondary winding, the other end of the second capacitor is electrically connected to the anode of the third diode, and the cathode of the third diode is electrically connected to the output end of the second secondary winding; the output end of the first secondary winding is also electrically connected to the positive electrode of the energy storage element through a second current limiting resistor, and the connection point between the second capacitor and the third diode is electrically connected to the negative electrode of the energy storage element.

7. The passive protection device compatible with multiple voltage levels according to claim 6, characterized in that: When the voltage level required by the trip coil is 110V, the voltage regulating module includes the second capacitor, the third diode, the third capacitor and the fourth diode, one end of the second capacitor is electrically connected to the output end of the first secondary winding, the other end of the second capacitor is electrically connected to the anode of the third diode, the cathode of the third diode is electrically connected to the output end of the second secondary winding, the cathode of the fourth diode is electrically connected to the other end of the second capacitor, the anode of the fourth diode is electrically connected to one end of the third capacitor, and the other end of the third capacitor is electrically connected to the cathode of the third diode; the output end of the second secondary winding is also electrically connected to the positive electrode of the energy storage element through the third current limiting resistor, and the connection point between the third capacitor and the fourth diode is electrically connected to the negative electrode of the energy storage element.

8. The passive protection device compatible with multiple voltage levels according to claim 7, characterized in that: When the voltage level required by the trip coil is 220V, the voltage regulating module includes the second capacitor, the third diode, the third capacitor, the fourth diode, the fourth capacitor, the fifth diode, the sixth diode and the fifth capacitor, one end of the second capacitor is electrically connected to the output end of the first secondary winding, the other end of the second capacitor is electrically connected to the anode of the third diode, the cathode of the third diode is electrically connected to the output end of the second secondary winding, the cathode of the fourth diode is electrically connected to the other end of the second capacitor, the anode of the fourth diode is electrically connected to one end of the third capacitor, and the other end of the third capacitor is electrically connected to the output end of the third secondary winding. The cathode of the pole tube is electrically connected, one end of the fourth capacitor is electrically connected to the other end of the second capacitor, the other end of the fourth capacitor is electrically connected to the anode of the fifth diode, the cathode of the fifth diode is electrically connected to one end of the third capacitor, the cathode of the sixth diode is electrically connected to the other end of the fourth capacitor, the anode of the sixth diode is electrically connected to one end of the fifth capacitor, and the other end of the fifth capacitor is electrically connected to one end of the third capacitor; the output end of the second secondary winding is electrically connected to the positive electrode of the energy storage element through the third current limiting resistor, and the connection point between the sixth diode and the fifth capacitor is electrically connected to the negative electrode of the energy storage element.

9. The passive protection device compatible with multiple voltage levels according to claim 1, characterized in that: The voltage feedback module includes a fourth current limiting resistor, a TVS diode and a photocoupler, one end of the fourth current limiting resistor is electrically connected to the positive electrode of the energy storage element, the other end of the fourth current limiting resistor is electrically connected to the cathode of the TVS diode, the anode of the TVS diode is electrically connected to the input end of the photocoupler, and the output end of the photocoupler is electrically connected to the controlled end of the switch module.

10. The passive protection device compatible with multiple voltage levels according to claim 1, characterized in that: The main control module is electrically connected to the driving end of the relay through a driving module. The driving module includes an inverter and a transistor. The input end of the inverter is electrically connected to the main control module, the output end of the inverter is electrically connected to the base of the transistor, the emitter of the transistor is grounded, and the collector of the transistor is electrically connected to the driving end of the relay.

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