Electric energy monitoring protection equipment of energy management system
By integrating transistors and relays, the power monitoring and protection equipment achieves rapid power cut-off and complete electrical isolation in the event of power anomalies, solving the problems of slow response speed and incomplete isolation of existing equipment, and ensuring the safe and stable operation of the system.
Patent Information
- Application Number
- CN202520286101.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing power monitoring and protection equipment cannot quickly cut off the power supply and achieve complete electrical isolation when it detects power abnormalities, resulting in problems such as mechanical action delay or leakage current.
By integrating transistor switching circuits and relay switching circuits, the transistors are quickly turned off by the start-up circuit to achieve initial current interruption, and the relays are triggered to switch channels to complete physical isolation, forming a dual cutoff mechanism.
It achieves rapid power-off response and complete electrical isolation in the event of power abnormalities, improving the safety and stability of the system and avoiding the hidden dangers of traditional relay delay and transistor leakage current.
Smart Images
Figure CN223613027U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electric energy monitoring and protection, specifically, an electric energy monitoring and protection device of an energy management system. BACKGROUND
[0002] An energy management system is used to monitor, control and optimize energy flow and energy consumption in an energy system. In many application scenarios, rail transit is one of the most frequently used fields of energy management systems. The rail transit energy management system is a special energy control and management system designed for urban rail transit, aiming to optimize energy use, improve energy efficiency, and reduce adverse effects on the environment. The system can provide real-time data monitoring, energy use analysis, power monitoring, power quality analysis, alarm notification and asset management functions for real-time management.
[0003] Electric energy is the core power of the operation of a rail transit system. From the traction of a train to the lighting, ventilation and air conditioning, escalators and other equipment in a station, stable supply of electric energy is the key to ensuring normal operation of rail transit. However, in the complex network of rail transit, the energy management system needs to be connected to numerous load devices, including ventilation and air conditioning systems, lighting facilities, escalators and elevators. These devices may encounter faults during long-term operation, thereby inducing electric energy abnormality phenomena such as short circuit, overcurrent, overvoltage and overload. These problems not only disturb the normal operation order of rail transit, but also, when load device faults cause electric energy abnormality, if the faults are not discovered in time and power-off measures are not taken, the power supply system is likely to bear excessive load. Further, this situation may trigger tripping of circuit breakers in the power supply system, thereby causing widespread power outage, posing a serious threat to the normal operation of the entire rail transit system. More seriously, if the devices are in an abnormal operating state for a long time, a line fire may be triggered, directly threatening the lives and safety of passengers and staff, and may cause huge economic losses and social panic.
[0004] Although there are devices for monitoring and protecting electric energy in the prior art, which cut off the power supply when detecting electric energy abnormality, the existing devices usually rely only on relays or only on transistors to cut off the power supply. When only relays are used to cut off the power supply, the mechanical action of the relays requires a certain time, which cannot quickly cut off the power supply, and may cause further deterioration of electric energy abnormality. When only transistors are used to cut off the power supply, the transistors may have leakage current, which cannot achieve complete electrical isolation.
[0005] Therefore, it is of great significance to solve the technical problem of how to quickly cut off the power supply and achieve complete electrical isolation when the electric energy monitoring and protection device detects electric energy abnormality. UTILITY MODEL CONTENTS
[0006] The application aims to provide an electric energy monitoring and protection device of an energy management system, which solves the technical problem that the existing electric energy monitoring and protection device cannot quickly cut off the power supply and achieve complete electrical isolation when monitoring abnormal electric energy in the energy management system of rail transit.
[0007] To solve the above technical problems, the application adopts the following solutions:
[0008] The utility model provides an electric energy monitoring and protection device of an energy management system, which comprises a device body, a plurality of channel monitoring modules and a controller arranged inside the device body, and the controller is connected with the plurality of channel monitoring modules respectively; each channel monitoring module comprises a monitoring circuit and a switching circuit, and the monitoring circuit, the switching circuit and the controller are connected with each other in pairs; characterized in that the switching circuit comprises a starting circuit, a transistor switching circuit and a relay switching circuit, the control end one and the control end two of the starting circuit are used as the control end one and the control end two of the switching circuit respectively, the control end one and the control end two of the starting circuit are connected with the output end of the monitoring circuit and the output pin of the controller respectively, and the output end of the starting circuit, the control end of the transistor switching circuit and the control end of the relay switching circuit are connected; the input end of the transistor switching circuit is used as the input end of the switching circuit, the output end of the transistor switching circuit is connected with the input end of the relay switching circuit, and the output end of the relay switching circuit is used as the output end of the switching circuit and is connected with the input end of the monitoring circuit;
[0009] The monitoring circuit monitors the current output by the relay switching circuit and outputs monitoring result signals to the control end one of the starting circuit and the input pin of the controller connected therewith respectively;
[0010] After receiving the monitoring result signals transmitted by the monitoring circuit, the starting circuit outputs control signals to the transistor switching circuit and the relay switching circuit to interrupt the power supply channel;
[0011] After receiving the control signals output by the starting circuit, the transistor in the transistor switching circuit is cut off to interrupt the power supply channel;
[0012] After receiving the control signals output by the starting circuit, the relay in the relay switching circuit performs switching action to interrupt the power supply channel;
[0013] The power supply channel transmits power to the load for power supply, the input end of the switching circuit is the input end of the power supply channel, and the output end of the switching circuit is the output end of the power supply channel.
[0014] In some embodiments, the starting circuit comprises an OR gate, a photoelectric coupler, a transistor one, a transistor two, a plurality of resistors, an input end one of the OR gate is set as a control end one of the starting circuit, an input end two of the OR gate, an output end of the OR gate, a collector of the transistor one, and a base of the transistor two are connected and grounded through a resistor here, a base of the transistor one is set as a control end two of the starting circuit, an emitter of the transistor one is grounded; the output end of the OR gate and the base of the transistor two are connected; an emitter of the transistor two and an input end of the photoelectric coupler are connected, a collector of the transistor two is connected to a power supply through a resistor; and an output end of the photoelectric coupler is set as an output end of the starting circuit.
[0015] In some embodiments, the transistor switch circuit comprises a field effect transistor, a diode, a gate of the field effect transistor is set as a control end of the transistor switch circuit, a drain of the field effect transistor is an input end of the transistor switch circuit, a source of the field effect transistor is an output end of the transistor switch circuit, and the drain of the field effect transistor is grounded through the diode.
[0016] In some embodiments, the relay switch circuit comprises a relay, a transistor three, a sampling resistor, and a plurality of resistors, an input end of the relay is set as an input end of the relay switch circuit, an output end of the relay is grounded; a control input end of the relay is connected to a power supply, a control output end of the relay and a collector of the transistor three are connected and connected to the power supply through a resistor here; a base of the transistor three is set as a control end of the relay switch circuit, an emitter of the transistor three is grounded; an input and output end of the relay and one end of the sampling resistor are connected and set as a sampling end one here, the other end of the sampling resistor is grounded through a resistor, and the sampling resistor and a resistor are connected and set as a sampling end two;
[0017] The sampling end one and the sampling end two are both output ends of the relay switch circuit, and the sampling end one and the sampling end two are respectively connected to input ends of the monitoring circuit.
[0018] In some embodiments, the relay switch circuit further comprises a discharging circuit, and the output end of the relay is grounded through the discharging circuit.
[0019] In some embodiments, the discharging circuit comprises a resistor and a capacitor, one end of the resistor, one end of the capacitor, and the output end of the relay are connected, the other end of the resistor and the other end of the capacitor are connected and grounded.
[0020] In some embodiments, the monitoring circuit comprises a sampling circuit and a judging circuit; an input end of the sampling circuit is connected with an output end of the relay switching circuit as an input end of the monitoring circuit; an output end of the sampling circuit is connected with an input end of the judging circuit; and an output end of the judging circuit is set as an output end of the monitoring circuit and a control end of the starting circuit.
[0021] In some embodiments, the sampling circuit comprises an operational amplifier and a plurality of resistors; an input end one and an input end two of the operational amplifier are connected to the output end of the relay switching circuit respectively; the input end one of the operational amplifier is connected to ground through a resistor; the input end two of the operational amplifier is connected to an output end of the operational amplifier through the resistor; and the output end of the operational amplifier is set as an output end of the sampling circuit.
[0022] In some embodiments, the judging circuit comprises a comparator and two resistors; an input end one of the comparator is connected to a power supply through a resistor; an input end one of the comparator is connected to ground through another resistor; an input end two of the comparator is set as an input end of the judging circuit; and an output end of the comparator is set as an output end of the judging circuit.
[0023] In some embodiments, the controller comprises a master control chip; an input pin of the master control chip is set as an input pin of the controller; an output pin of the master control chip is set as an output pin of the controller; and the master control chip is of STM32G070CBT6 type.
[0024] The technical scheme has at least the following advantages and beneficial effects:
[0025] The utility model discloses a plurality of channel monitoring module and controller, and the controller is connected with a plurality of channel monitoring module respectively, and each channel monitoring module comprises monitoring circuit and switch circuit, and monitoring circuit, switch circuit, controller are connected with each other in pairs, and the switch circuit comprises starting circuit, transistor switch circuit, relay switch circuit, and monitoring circuit monitors the current output by relay switch circuit and exports monitoring result signal to the control end one of starting circuit and the input pin of controller connected with it respectively, and starting circuit exports control signal to transistor switch circuit and relay switch circuit after receiving the monitoring result signal transmitted by monitoring circuit and disconnects power supply channel, and transistor switch circuit receives the control signal exported by starting circuit, and the transistor in transistor switch circuit is cut off to disconnect power supply channel, and relay switch circuit receives the control signal exported by starting circuit, and the relay in relay switch circuit executes switching action to disconnect power supply channel.
[0026] The utility model discloses a transistor switch circuit and relay switch circuit are integrated in cooperation, realized the power cut mechanism of double cut-off, when monitoring the abnormality of electric energy, the transistor switch circuit in starting circuit trigger transistor is cut off fast and realizes the preliminary current interruption, and starting circuit triggers the relay switch circuit in the relay switching channel of relay and completes physical isolation, utilizes the high speed characteristic of transistor to avoid the delay problem of traditional relay single action, and through the complete disconnection of relay, the leakage current hidden danger that transistor can exist is eliminated. Complementary redundancy is formed in the time sequence, and transistor is responsible for the quick current interruption, and the timeliness of response is ensured, and relay is responsible for the final physical isolation, and the thoroughness of electrical isolation is ensured. This double cut-off mechanism not only improves the speed of power-off response greatly, but also ensures that electrical isolation is absolutely safe, and provides solid guarantee for the safe and stable operation of system. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 It is a structural schematic diagram of the utility model;
[0028] Figure 2 It is a system block diagram of the utility model;
[0029] Figure 3 It is a switch circuit diagram of the utility model;
[0030] Figure 4 It is a monitoring circuit diagram of the utility model. DETAILED DESCRIPTION
[0031] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of protection of the utility model.
[0032] It should be noted that similar reference numerals and letters refer to like items in the accompanying drawings, and therefore, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings. If the terms "center", "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or position shown in the drawings, or the orientation or position commonly used when the product of the application is used, and are only used to facilitate the description of the application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. It should also be noted that unless otherwise specified and limited, if the terms "provision", "installation", "connection" appear, they should be understood broadly, for example, they can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.
[0033] Embodiment 1
[0034] Please refer to Figures 1-4 The utility model provides a kind of electric energy monitoring protection equipment of energy management system, same as prior art, including equipment body, equipment is internally provided with multiple channel monitoring module and controller, controller is connected with multiple channel monitoring module respectively;Each channel monitoring module includes monitoring circuit and switch circuit, monitoring circuit, switch circuit, controller are pairwise connected with each other;
[0035] It should be noted that the controller includes a main control chip, the input pin of the main control chip serves as the input pin of the controller, and the output pin of the main control chip serves as the output pin of the controller. It should be noted that the input pin and the output pin of the main control chip are IO port pins of the main control chip.
[0036] In this embodiment, the model of the main control chip is STM32G070CBT6.
[0037] It should be explained that, because multiple channel monitoring modules are provided in the device, the device can monitor the electric energy of multiple channels simultaneously, improving the monitoring efficiency and accuracy. The external power supply is transmitted to different loads through each channel monitoring module to provide power to the loads. The loads include, but are not limited to, ventilation and air conditioning systems, lighting facilities, escalators and elevators.
[0038] Different from the prior art, the switch circuit comprises a starting circuit, a transistor switch circuit and a relay switch circuit, control end one and control end two of the starting circuit are control end one and control end two of the switch circuit respectively, and control end one and control end two of the starting circuit are connected with an output end of the monitoring circuit and an output pin of the controller respectively, an output end of the starting circuit, a control end of the transistor switch circuit and a control end of the relay switch circuit are connected; an input end of the transistor switch circuit is an input end of the switch circuit, an output end of the transistor switch circuit is connected with an input end of the relay switch circuit, and an output end of the relay switch circuit is an output end of the switch circuit and is connected with an input end of the monitoring circuit;
[0039] The monitoring circuit monitors the current output by the relay switch circuit and outputs a monitoring result signal to control end one of the starting circuit and an input pin of the controller connected therewith respectively;
[0040] After receiving the monitoring result signal transmitted by the monitoring circuit, the starting circuit outputs a control signal to the transistor switch circuit and the relay switch circuit to disconnect the power supply channel;
[0041] After receiving the control signal output by the starting circuit, the transistor in the transistor switch circuit is turned off to disconnect the power supply channel;
[0042] After receiving the control signal output by the starting circuit, the relay in the relay switch circuit performs switching action to disconnect the power supply channel;
[0043] The power supply channel transmits power to the load for power supply to the load, the input end of the switch circuit is the input end of the power supply channel, and the output end of the switch circuit is the output end of the power supply channel.
[0044] Further, the starting circuit comprises an OR gate, a photoelectric coupler, a transistor one, a transistor two and a plurality of resistors, the input end one of the OR gate is control end one of the starting circuit, the input end two of the OR gate, the output end of the OR gate, the collector of the transistor one and the base of the transistor two are connected and grounded through a resistor, the base of the transistor one is control end two of the starting circuit, and the emitter of the transistor one is grounded; the output end of the OR gate is connected with the base of the transistor two; the emitter of the transistor two is connected with the input end of the photoelectric coupler, the collector of the transistor two is connected with a power supply through a resistor; and the output end of the photoelectric coupler is the output end of the starting circuit.
[0045] In the embodiment, the model of the OR gate is 74LVC1G32GW, and the model of the photoelectric coupler is PC357C.
[0046] It should be noted that the input end of the OR gate receives the monitoring result signal transmitted by the monitoring circuit, and outputs a control signal to the input end of the optoelectronic coupler. The optoelectronic coupler is turned on after receiving the control signal, and the output end of the optoelectronic coupler outputs a low level. The control signal output by the output end of the OR gate is fed back to the input end two of the OR gate, thereby forming a feedback loop, so that the OR gate maintains a high level output state, and the starting circuit is always in an open state.
[0047] Further, the transistor switch circuit includes a field effect transistor and a diode. The gate of the field effect transistor is configured as the control end of the transistor switch circuit. The drain of the field effect transistor is configured as the input end of the transistor switch circuit. The source of the field effect transistor and the drain of the field effect transistor are configured as the output end of the transistor switch circuit. The drain of the field effect transistor is connected to the ground through the diode.
[0048] In this embodiment, the field effect transistor is an NMOS tube, and the model thereof is IRLR8726.
[0049] It should be noted that the diode functions as a discharging element to release the charge accumulated between the drain and the source, thereby ensuring the stability and reliability of the circuit.
[0050] It should be noted that when the power is normal, the gate of the field effect transistor receives a high level output by the starting circuit, and the field effect transistor is in a conductive state. When the power is abnormal, the gate of the field effect transistor receives a low level output by the starting circuit, and the field effect transistor is in a cut-off state.
[0051] It should be noted that the reason for the abnormality of the power is that the load fails, causing short circuit, overcurrent, overvoltage, and overload in the circuit.
[0052] Further, the relay switch circuit includes a relay, a triode three, a sampling resistor, and a plurality of resistors. The input end of the relay is configured as the input end of the relay switch circuit, and the output end of the relay is connected to the ground. The control input end of the relay is connected to the power supply, and the control output end of the relay is connected to the collector of the triode three, and the triode three is connected to the power supply through a resistor. The base of the triode three is configured as the control end of the relay switch circuit, and the emitter of the triode three is connected to the ground. The input and output ends of the relay are connected to one end of the sampling resistor, and a sampling end one is arranged at this position. The other end of the sampling resistor is connected to the ground through a resistor, and a sampling end two is arranged at the connection position between the sampling resistor and the resistor.
[0053] The sampling end one and the sampling end two are both output ends of the relay switch circuit, and the sampling end one and the sampling end two are respectively connected to the input end of the monitoring circuit.
[0054] It should be noted that the sampling end two is not only connected to the monitoring circuit, but also serves as an output end of the power supply channel to output the power supply to the load for power supply to the load.
[0055] It should be noted that the control input end of the relay is set to high level; when the power is normal, since the base of the third transistor receives the high level transmitted by the starting circuit, the third transistor is cut off, the control output end of the relay is in high level state, causing the normally closed contact in the relay to close and the normally open contact to open, at this time the relay keeps the original channel unchanged, that is, the power signal is output in turn through the relay input end and the relay input output end; when the power is abnormal, since the base of the third transistor receives the low level transmitted by the starting circuit, the third transistor is turned on, the control output end of the relay is in low level state, causing the normally closed contact in the relay to open and the normally open contact to close, at this time the relay switches the channel, the power channel is cut off, at this time the remaining charge originally in the relay input output end is transmitted to the output end of the relay through the newly closed normally open contact for discharge treatment.
[0056] In this embodiment, the relay used is a relay produced by Omron, and the model number is G7SA-5A1B.
[0057] In some embodiments, the relay switch circuit further comprises a discharge circuit, and the output end of the relay is connected to ground through the discharge circuit.
[0058] Specifically, the discharge circuit comprises a resistor and a capacitor, one end of the resistor, one end of the capacitor and the output end of the relay are connected, and the other end of the resistor and the other end of the capacitor are connected and grounded.
[0059] Further, the switch circuit comprises an OR gate U1, an optocoupler U2, a relay U3, transistors Q1, Q2 and Q3, a field effect transistor Q4, capacitors C1 and C2, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and R11, and a diode D1.
[0060] Among them, the starting circuit comprises an OR gate U1, an optocoupler U2, transistors Q1 and Q2, resistors R1, R2, R3, R4, R5 and R6, and capacitors C1 and C2; the transistor switch circuit comprises a field effect transistor Q4 and a diode D1; the relay switch circuit comprises a relay U3, a transistor Q3, a capacitor C2, and resistors R7, R8, R9, R10 and R11.
[0061] In the relay switch circuit, the discharge circuit comprises a resistor R9 and a capacitor C2.
[0062] Specifically, as Figure 2As shown, one end of the resistor R1 is set as the CON_IN2 input end, the other end of the resistor R1, one end of the resistor R2, and the base of the transistor Q1 are connected, the collector of the transistor Q1, pin 2 of the OR gate U1, pin 4 of the OR gate U1, one end of the resistor R3, and one end of the resistor R4 are connected, pin 1 of the OR gate U1 is set as the CON_IN1 input end, pin 5 of the OR gate U1, one end of the resistor R6, and one end of the resistor R5 are connected and connected to the power supply, the other end of the resistor R3 and the base of the transistor Q2 are connected, the collector of the transistor Q2 and the other end of the resistor R6 are connected, the other end of the resistor R5, one end of the capacitor C1, the gate of the field effect transistor Q4, pin 4 of the optocoupler U2, and one end of the resistor R7 are connected, and the other end of the capacitor C1 is grounded; the emitter of the transistor Q2 and pin 1 of the optocoupler U2 are connected, one end of the resistor R7 and the base of the transistor Q3 are connected, the source of the field effect transistor Q4 is set as the TH_IN input end, the drain of the field effect transistor Q4, the anode of the diode D1, and pin 3 of the relay U3 are connected, the other end of the resistor R2, the emitter of the transistor Q1, pin 3 of the OR gate U1, the other end of the resistor R4, pin 2 of the optocoupler U2, pin 3 of the optocoupler U2, and the cathode of the diode D1 are connected and grounded, the emitter of the transistor Q3, one end of the resistor R8, and pin 4 of the relay U3 are connected, the other end of the resistor R8 and pin 1 of the relay U3 are connected and connected to the power supply, pin 2 of the relay U3, one end of the resistor R9, and one end of the capacitor C2 are connected, the other end of the resistor R9 and the other end of the capacitor C2 are connected and grounded, pin 5 of the relay U3 and one end of the resistor R10 are connected and set as the T_OUT1 output end at this position, the other end of the resistor R10 and one end of the resistor R11 are connected and set as the T_OUT2 output end at this position; the other end of the resistor R11 and the collector of the transistor Q3 are connected and grounded.
[0063] It should be noted that the transistor Q1 is transistor one, the transistor Q2 is transistor two, and the transistor Q3 is transistor three; wherein the transistor Q1 and the transistor Q2 are both NPN type, and the transistor Q3 is PNP type.
[0064] It should be noted that the TH_IN input end is the input end of the transistor switching circuit, the CON_IN1 input end and the CON_IN2 input end are respectively the control end one and the control end two of the starting circuit, and the T_OUT1 output end and the T_OUT2 output end are respectively the sampling end one and the sampling end two in the relay switching circuit.
[0065] It should be noted that the CON_IN1 input end is connected to the output end of the monitoring circuit, and the CON_IN2 input end is connected to the IO port of the main control chip; the T_OUT1 output end and the T_OUT2 output end are respectively connected to the input end of the monitoring circuit.
[0066] The monitoring circuit comprises a sampling circuit and a judging circuit; an input end of the sampling circuit is connected with an output end of the relay switching circuit as an input end of the monitoring circuit, an output end of the sampling circuit is connected with an input end of the judging circuit, and an output end of the judging circuit is connected with a control end one of the starting circuit as an output end of the monitoring circuit.
[0067] Further, the sampling circuit comprises an operational amplifier and a plurality of resistors; an input end one and an input end two of the operational amplifier are connected to the output end of the relay switching circuit respectively, the input end one of the operational amplifier is connected to the ground through a resistor, the input end two of the operational amplifier is connected to an output end of the operational amplifier through a resistor, and the output end of the operational amplifier is set as an output end of the sampling circuit.
[0068] It should be noted that the model of the operational amplifier is LMV321.
[0069] It should be noted that the input end one and the input end two of the operational amplifier are connected to two ends of the sampling resistor respectively, i.e. the input end one and the input end two of the operational amplifier are connected to the sampling end one and the sampling end two respectively, and the operational amplifier collects the current at the two ends of the sampling resistor, processes the current through differential amplification, and obtains a sampling result signal;
[0070] Further, the judging circuit comprises a comparator and two resistors; an input end one of the comparator is connected to a power supply through a resistor, and an input end two of the comparator is connected to the ground through another resistor; an input end two of the comparator is set as an input end of the judging circuit, and an output end of the comparator is set as an output end of the judging circuit.
[0071] It should be noted that the model of the comparator is LM358.
[0072] It should be noted that after the input end of the comparator receives the sampling result signal output by the sampling circuit, the comparator compares the sampling result signal with a set threshold value and outputs a monitoring result signal.
[0073] Further, the operational amplifier U5, the comparator U6, the capacitors C3 and C4, and the resistors R13, R14, R15, R16, R17, R18 and R19;
[0074] Among them, the sampling circuit comprises the operational amplifier U5, the capacitor C3, and the resistors R13, R14, R15 and R16; the judging circuit comprises the comparator U6, the capacitor C4, and the resistors R17, R18 and R19;
[0075] Specifically, as shown in Figure 3As shown, one end of resistor R14 is set as D_IN1 input end, the other end of resistor R14, one end of resistor R15, pin 1 of operational amplifier U5 are connected, the other end of resistor R15 is grounded; one end of resistor R13 is set as D_IN2 input end, the other end of resistor R13, pin 3 of operational amplifier U5, one end of resistor R16, one end of capacitor C3 are connected, pin 2 of operational amplifier U5 is connected to power supply, pin 5 is grounded, pin 4 of operational amplifier U5, the other end of resistor R16, the other end of capacitor C3, one end of resistor R18 are connected, the other end of resistor R18, one end of capacitor C4, pin 2 of comparator U6 are connected, one end of resistor R17 is connected to power supply, the other end of resistor R17, one end of resistor R19, pin 3 of comparator U6 are connected, the other end of resistor R19 and the other end of capacitor C4 are connected and grounded, pin 4 of comparator U6 is connected to power supply, pin 5 is grounded, pin 1 of comparator U6 is set as CON_OUT output end.
[0076] It should be noted that D_IN1 input end and D_IN2 input end are input end 1 and input end 2 of operational amplifier respectively, CON_OUT output end is output end of judgment circuit; wherein, D_IN1 input end and D_IN2 input end are connected with T_OUT1 output end and T_OUT2 output end respectively, CON_OUT output end is connected with CON_IN1 input end.
[0077] For the convenience of understanding, the working process of one channel monitoring module is described as follows:
[0078] External power supply flows from TH_IN input end, passes through field effect tube Q4, relay U3 and T_OUT output end in turn and is output to load; D_IN1 input end and D_IN2 input end receive electric energy transmitted by T_OUT1 output end and T_OUT2 output end respectively and differentially amplify electric energy in sampling circuit to obtain data to be compared, sampling circuit transmits data to be compared to judgment circuit for judgment;
[0079] If electric energy is normal, sampling circuit outputs low level to CON_IN1 input end of monitoring circuit and IO port of main control chip respectively, at this time, or gate U1 outputs low level to input end of photoelectric coupler U2, photoelectric coupler U2 is cut off, at this time, gate of field effect tube Q4 and base of triode Q3 all obtain high level signal, at this time, field effect tube Q4 is turned on, triode Q3 is cut off to make relay U3 keep original channel unchanged;
[0080] If the electric energy is abnormal, the sampling circuit outputs high level to the CON_IN1 input end of the monitoring circuit and the IO port of the main control chip, at this time, the or gate U1 outputs high level to the input end of the photoelectric coupler U2, the photoelectric coupler U2 is turned on, at this time, the gate of the field effect tube Q4 and the base of the triode Q3 all get low level signals, at this time, the field effect tube Q4 is cut off, the triode Q3 is turned on to make the relay U3 switch the channel, and the power supply channel is cut off; at this time, the pin 2 of the or gate U1 continuously receives the high level signal transmitted by the pin 4 of the or gate U1, so that the or gate keeps the locking state and continuously outputs the high level signal.
[0081] It should be noted that after the IO port of the main control chip gets the high level output by the sampling circuit, the main control chip immediately transmits the alarm information to the staff, and the staff can timely repair the fault load after getting the alarm message. After the repair is completed, the electric energy is restored to normal, and the staff transmits the control signal to the CON_IN2 input end through the main control chip, so that the triode Q1 is turned on, at this time, the pin 2 of the or gate U1 becomes low level, at the same time, the sampling circuit outputs low level to the CON_IN1 input end of the monitoring circuit, so that the or gate U1 outputs low level, and the above-mentioned electronic devices return to the state when the electric energy is normal.
[0082] It should be noted that the above-mentioned electronic devices can be purchased on the domestic and foreign markets.
[0083] At this point, the embodiments of the utility model have been described in detail. In order to avoid shielding the concept of the utility model, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions of the utility model herein according to the above description, and the scope of the utility model is defined by the appended claims.
Claims
1. An energy monitoring and protection device for an energy management system, comprising a device body, wherein the device internally includes multiple channel monitoring modules and a controller, the controller being connected to each of the multiple channel monitoring modules; each channel monitoring module includes a monitoring circuit and a switching circuit, the monitoring circuit, the switching circuit, and the controller being interconnected in pairs; characterized in that: The switch circuit comprises a starting circuit, a transistor switch circuit and a relay switch circuit, control end one and control end two of the starting circuit are respectively control end one and control end two of the switch circuit, and control end one and control end two of the starting circuit are respectively connected with the output end of the monitoring circuit and the output pin of the controller, and the output end of the starting circuit, the control end of the transistor switch circuit and the control end of the relay switch circuit are connected; the input end of the transistor switch circuit is the input end of the switch circuit, the output end of the transistor switch circuit is connected with the input end of the relay switch circuit, and the output end of the relay switch circuit is the output end of the switch circuit and is connected with the input end of the monitoring circuit; The monitoring circuit monitors the current output by the relay switch circuit and outputs a monitoring result signal to control end one of the starting circuit and the input pin of the controller; After receiving the monitoring result signal transmitted by the monitoring circuit, the starting circuit outputs a control signal to the transistor switch circuit and the relay switch circuit to disconnect the power supply channel; After receiving the control signal output by the starting circuit, the transistor in the transistor switch circuit is turned off to disconnect the power supply channel. After receiving the control signal output by the starting circuit, the relay in the relay switch circuit performs switching action to disconnect the power supply channel. The power supply channel transmits power to the load for power supply, the input end of the switch circuit is the input end of the power supply channel, and the output end of the switch circuit is the output end of the power supply channel.
2. The electric energy monitoring and protection device of an energy management system according to claim 1, characterized in that, The starting circuit comprises an OR gate, a photoelectric coupler, a transistor one, a transistor two and a plurality of resistors, input end one of the OR gate is control end one of the starting circuit, input end two of the OR gate, the output end of the OR gate, the collector of the transistor one and the base of the transistor two are connected and grounded through resistors, the base of the transistor one is control end two of the starting circuit, and the emitter of the transistor one is grounded; the output end of the OR gate is connected with the base of the transistor two; the emitter of the transistor two is connected with the input end of the photoelectric coupler, and the collector of the transistor two is connected with the power supply through a resistor; and the output end of the photoelectric coupler is the output end of the starting circuit.
3. The electric energy monitoring and protection device of an energy management system according to claim 1, wherein, The transistor switch circuit comprises a field effect transistor and a diode, the gate of the field effect transistor is the control end of the transistor switch circuit, the drain of the field effect transistor is the input end of the transistor switch circuit, the source of the field effect transistor is the output end of the transistor switch circuit, and the drain of the field effect transistor is grounded through the diode.
4. The electrical energy monitoring and protection device of an energy management system according to claim 1, wherein, The relay switch circuit comprises a relay, a triode three, a sampling resistor and a plurality of resistors, an input end of the relay is arranged as an input end of the relay switch circuit, and an output end of the relay is grounded; a control input end of the relay is connected to a power supply, a control output end of the relay and a collector of the triode three are connected, and the triode three is connected to the power supply through a resistor; a base of the triode three is arranged as a control end of the relay switch circuit, and an emitter of the triode three is grounded; an input and output end of the relay is connected to one end of the sampling resistor, and a sampling end one is arranged at the one end; the other end of the sampling resistor is grounded through a resistor, and a sampling end two is arranged at a connection position of the sampling resistor and the resistor. The sampling end one and the sampling end two are output ends of the relay switch circuit, and the sampling end one and the sampling end two are respectively connected to input ends of the monitoring circuit.
5. The electrical energy monitoring and protection device of an energy management system according to claim 4, wherein, The relay switch circuit further comprises a discharge circuit, and the output end of the relay is grounded through the discharge circuit.
6. The electrical energy monitoring and protection device of an energy management system according to claim 5, wherein, The discharge circuit comprises a resistor and a capacitor, one end of the resistor, one end of the capacitor and the output end of the relay are connected, and the other end of the resistor and the other end of the capacitor are connected and grounded.
7. The electrical energy monitoring and protection device of an energy management system according to claim 1, wherein, The monitoring circuit comprises a sampling circuit and a judgment circuit; an input end of the sampling circuit is connected to the output end of the relay switch circuit and arranged as an input end of the monitoring circuit, an output end of the sampling circuit is connected to an input end of the judgment circuit, and an output end of the judgment circuit is arranged as an output end of the monitoring circuit and connected to a control end one of the starting circuit.
8. The electrical energy monitoring and protection device of an energy management system according to claim 7, wherein, The sampling circuit comprises an operational amplifier and a plurality of resistors, one input end and the other input end of the operational amplifier are respectively connected to the output ends of the relay switch circuit, the one input end of the operational amplifier is grounded through a resistor, the other input end of the operational amplifier is connected to an output end of the operational amplifier through the resistor, and the output end of the operational amplifier is arranged as an output end of the sampling circuit.
9. The electrical energy monitoring and protection device of an energy management system according to claim 7, wherein, The judgment circuit comprises a comparator and two resistors, one input end of the comparator is connected to a power supply through one resistor, the one input end of the comparator is grounded through the other resistor; the other input end of the comparator is arranged as an input end of the judgment circuit, and an output end of the comparator is arranged as an output end of the judgment circuit.
10. The electrical energy monitoring and protection device of an energy management system according to claim 1, wherein, The controller comprises a main control chip, input pins of the main control chip are arranged as input pins of the controller, and output pins of the main control chip are arranged as output pins of the controller; the main control chip is of an STM32G070CBT6 type.