A self-contained power supply electronic control protection circuit for battery pack / inverter

Abstract

The invention discloses a self-contained power supply electric control protection circuit for a battery pack / inverter, belonging to the field of electrical control technology. The protection circuit has two modes of local control and remote control, which can be combined arbitrarily. When the system is started, the inverter closing button on the remote control panel of the remote control transmitter or the inverter closing button of the electric control cabinet can be selected to directly connect the DC contactor coil on the DC side through the control loop, and the inverter outputs AC220V / 380V AC voltage for power supply after the response time; when the system is stopped, the inverter opening button on the remote control panel of the remote control transmitter or the inverter opening button on the electric control cabinet can be selected to first cut off the AC load on the inverter output side, and the time setting is used to delay the cutting off of the DC contactor on the DC side, so as to avoid power outage with load, reduce the influence of DC arc on the control device, and achieve a safe and reliable effect. The circuit structure is simple, the operating cost is greatly reduced, the control is reliable, and the maintenance is more convenient.

Description

Technical Field

[0001] The present invention belongs to the field of electronic control technology for material conveying equipment such as mining, sintering, and ironmaking production, and relates to a self-contained power supply electronic control protection circuit for a battery pack / inverter, which is suitable for the application of electrical control protection technology for equipment such as a low-voltage DC battery pack supplying power to an inverter, and an inverter outputting AC220V / 380V voltage to drive small and medium-power AC loads. Background Art

[0002] DC battery pack is one of the commonly used power sources in enterprises. It outputs AC220V / 380V AC through the inverter to drive the normal operation of various equipment. In the traditional self-contained power supply control scheme, in order to save the battery pack power, the DC side path needs to be disconnected when the system is not working. The output end of the battery pack and the main circuit of the inverter input end are mostly connected by a circuit breaker or a DC contactor, and the circuit breaker of the local control box is used for opening / closing; or by setting a start / stop button on the control box panel, the circuit breaker or DC contactor is directly connected / disconnected, thereby disconnecting or connecting the DC side main circuit. When set in this way, the electrical control has the situation of inverter load disconnection, and the safety performance is low. Because the output voltage of the battery pack is small (DC48V), but the output current is large, and because the magnetic field energy stored in the inductive load is released instantly when the DC is disconnected, the high-energy arc generated at the breakpoint is very likely to cause contact arc oxidation, contact surface burrs, sintering and adhesion, and even arc short circuit, burning of devices and other safety accidents. Therefore, it is necessary to design a self-contained power supply electronic control protection circuit for the battery pack / inverter to ensure the orderly production and avoid the occurrence of safety accidents. Summary of the invention

[0003] In view of the defect that the traditional on-off control method of the battery pack and the inverter in the background technology is prone to the inverter opening with load, thereby causing a fault or safety accident, the present invention provides a self-contained power supply electronic control protection circuit for a battery pack / inverter, and the technical solution to the technical problem is as follows:

[0004] The present invention discloses a self-contained power supply electric control protection circuit for a battery pack / inverter, which comprises a module power supply, a DC battery pack, an inverter, a load, a DC contactor, an operation signal relay, an AC contactor, a power-off delay relay, an AC power circuit breaker, a control power circuit breaker and a DC control power circuit breaker; the positive and negative poles of the DC battery pack are respectively connected to the module power supply and the inverter through lines; the main contacts of the DC contactor are connected to the lines of the DC battery pack and the inverter; the U, V and W output terminals of the inverter are respectively connected to the load through three lines, the main contacts of the AC power circuit breaker and the main contacts of the AC contactor are respectively connected to the three lines, and an AC side is arranged between one of the three lines between the AC power circuit breaker and the AC contactor and the N terminal of the inverter. A control circuit, wherein the AC side control circuit is connected with the main contacts of the control power circuit breaker, the make contacts of the operation signal relay and the coil of the AC contactor; the module power supply is connected with two parallel first control branches and second control branches through the DC control power circuit breaker, the first control branch is connected with the inverter closing button, the inverter opening button and the coil of the operation signal relay, and the second control branch is connected with the make contacts of the operation signal relay and the coil of the DC contactor; the two ends of the inverter closing button on the first control branch are also connected in parallel with the make contacts of the operation signal relay, and the two ends of the coil of the operation signal relay are connected in parallel with the coil of the power-off delay relay; the two ends of the make contacts of the operation signal relay on the second control branch are connected in parallel with the make contacts of the power-off delay relay.

[0005] Furthermore, the module power supply is also connected to an indicator light unit through a line, and the indicator light unit includes first, second, third, and fourth indicator light branches in parallel, the first indicator light branch is connected to a control power indicator light and a normally closed contact of a DC control power circuit breaker; the second indicator light branch is connected to a system working indicator light and a normally closed contact of an operation signal relay; the first indicator light branch is connected to an inverter closing indicator light and a normally closed contact of a DC contactor; the first indicator light branch is connected to a load working indicator light and a normally closed contact of an AC contactor.

[0006] Furthermore, three lines connecting the main contacts of the AC contactor to the load are provided with an overload protection relay, and the break contacts of the overload protection relay are connected to the AC side control circuit.

[0007] Furthermore, it also includes a remote control receiver connected to the module power supply through a third control branch, and the remote control receiver is equipped with a corresponding remote control transmitter for receiving the command signal of the remote control transmitter and feeding back the operation signal to the remote control transmitter in real time; the remote control receiver is provided with an inverter closing unit and an inverter opening unit, and the inverter closing unit is connected in parallel with the moving contact of the operation signal relay on the first control branch through a line, and the inverter opening unit is connected to the first control branch through a line; the remote control transmitter is provided with a remote control transmitter power switch, a remote control panel inverter closing button and a remote control panel inverter opening button.

[0008] Furthermore, the remote control transmitter is also provided with a remote control panel control power indicator light, a remote control panel system working indicator light, a remote control panel inverter closing indicator light and a remote control panel AC load working indicator light; the remote control receiver includes an input module, and the DI0 terminal, DI1 terminal, DI2 terminal, DI3 terminal and COM terminal of the input module are respectively connected to the moving contact of the DC control power circuit breaker, the moving contact of the operation signal relay, the moving contact of the DC contactor, and the moving contact of the AC contactor.

[0009] Furthermore, a PLC output relay is also provided on the first control branch to facilitate interlocking protection with the system PLC control system.

[0010] Compared with the existing technology, the self-contained power supply electric control protection circuit for battery pack / inverter described in the present invention replaces the local direct control mode with a set of remote control / local panel control protection circuit, simplifies the installation and wiring mode, and interlocks with the system PLC for protection. The time-adjustable protection circuit intervenes in the control, avoiding the influence of DC sparks on the circuit and the electric control components when the inverter is powered off with load, and ensuring the extension of the service life of the electric control components. After the implementation of the present invention, the system transformation will greatly reduce the control components, and each control component can be installed in the electric control cabinet, which can be directly installed on site. It only needs to connect the DC battery pack, inverter and AC and DC side electric control units according to the drawings, etc., the failure rate is reduced, and the maintenance is more convenient and reliable, which ensures the requirement of frequent operation of the inverter and avoids the occurrence of failures and safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall electronic control principle of the present invention;

[0012] Figure 2 This is a schematic diagram of the electric control system of the protection circuit in the present invention;

[0013] Figure 3 is a schematic diagram of the indicator light unit in the present invention;

[0014] Figure 4is a schematic diagram of a remote control transmitter in the present invention;

[0015] Figure 5 This is a wiring diagram of the input module of the remote control receiver in the present invention;

[0016] In the figure: 1. Module power supply, 2. DC battery pack, 3. Inverter, 4. Remote control receiver, 5. Load, 6. Remote control transmitter power switch, 7. Inverter closing button on the remote control panel, 8. Inverter opening button on the remote control panel, 9. Control power indicator light on the remote control panel, 10. System working indicator light on the remote control panel, 11. Inverter closing indicator light on the remote control panel, 12. AC load working indicator light on the remote control panel, 13. AC side control circuit, 14. First control branch, 15. Second control branch, 16. First indicator light branch, 17. Second indicator light branch, 18. Third indicator light branch, 19. The fourth indicator light branch, 20. The third control branch, 21. Remote control transmitter, 22. Inverter closing unit, 23. Inverter opening unit, ZM. DC contactor, KA. Operation signal relay, KM. AC contactor, KT. Power-off delay relay, KH. Overload protection relay, QL. AC power circuit breaker, QL1. Control power circuit breaker, QF. DC control power circuit breaker, HL1. Control power indicator light, HL2. System working indicator light, HL3. Inverter closing indicator light, HL4. Load working indicator light, SS. Inverter closing button, SB. Inverter opening button. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the present disclosure belongs. "Up", "down", "left", "right", "front", "back" and the like used in the patent application specification and claims of the present disclosure are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly; "connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The parts not described in detail in the present invention are all known technologies of technicians in the field of this technology.

[0018] Embodiment 1:

[0019] like Figures 1 to 5As shown, the present invention is a self-contained power supply electric control protection circuit for a battery pack / inverter, which includes a module power supply 1, a DC battery pack 2, an inverter 3, a load 5, a DC contactor ZM, an operation signal relay KA, an AC contactor KM, a power-off delay relay KT, an AC power circuit breaker QL, a control power circuit breaker QL1 and a DC control power circuit breaker QF; the positive and negative electrodes of the DC battery pack 2 are respectively connected to the positive and negative input terminals of the module power supply 1 and the inverter 3 through lines, and the module power supply 1 is connected to the DC battery pack 2. A DC48V / DC24V power supply is used to power the DC side circuit; the main contacts of the DC contactor ZM are connected to the lines of the DC battery pack 2 and the inverter 3; the U, V, and W output terminals of the inverter 3 are respectively connected to the load 5 through three lines, and the load 5 is generally a three-phase asynchronous motor. The main contacts of the AC power circuit breaker QL and the main contacts of the AC contactor KM are respectively connected to the three lines, and one of the three lines between the AC power circuit breaker QL and the AC contactor KM is connected to the N of the inverter 3. An AC side control circuit 13 is arranged between the terminals, and the AC side control circuit 13 is connected with the main contact of the control power circuit breaker QL1, the moving contact of the operation signal relay KA and the coil of the AC contactor KM; the module power supply 1 is connected with two parallel first control branches 14 and second control branches 15 through the DC control power circuit breaker QF, and the first control branch 14 is connected with the inverter closing button SS, the inverter opening button SB and the coil of the operation signal relay KA, and the inverter closing button SS and the inverter opening button SB are connected to the inverter closing button SS and the inverter opening button SB. The switch buttons SB are respectively a normally open switch button and a normally closed switch button, and the second control branch 15 is connected with the normally closed contacts of the operation signal relay KA and the coil of the DC contactor ZM; the two ends of the inverter closing button SS on the first control branch 14 are also connected in parallel with the normally closed contacts of the operation signal relay KA, and the two ends of the coil of the operation signal relay KA are connected in parallel with the coil of the power-off delay relay KT; the two ends of the normally closed contacts of the operation signal relay KA on the second control branch 15 are connected in parallel with the normally closed contacts of the power-off delay relay KT. In this embodiment, the module power supply 1, DC battery pack 2, inverter 3, DC contactor ZM, operation signal relay KA, AC contactor KM, power-off delay relay KT, AC power circuit breaker QL, control power circuit breaker QL1 and DC control power circuit breaker QF can all be installed in the electric control cabinet, and the inverter closing button SS and inverter opening button SB can be set on the panel of the electric control cabinet. The electric control cabinet outputs AC380V three-phase power to the load 5 through the output terminal in the cabinet, and the ground wire is connected to the ground mark of the control cabinet casing.

[0020] In this embodiment, the module power supply 1 is also connected to an indicator light unit through a line, and the indicator light unit includes first, second, third and fourth indicator light branches 16, 17, 18 and 19 connected in parallel, and the first indicator light branch 16 is connected to the control power indicator light HL1 and the closing contact of the DC control power circuit breaker QF; the second indicator light branch 17 is connected to the system working indicator light HL2 and the closing contact of the operation signal relay KA; the third indicator light branch 18 is connected to the inverter closing indicator light HL3 and the closing contact of the DC contactor ZM; the fourth indicator light branch 19 is connected to the load working indicator light HL4 and the closing contact of the AC contactor KM; the control power indicator light HL1, the system working indicator light HL2, the inverter closing indicator light HL3 and the load working indicator light HL4 can also be set on the electric control cabinet panel.

[0021] In this embodiment, to further ensure the safe operation of the load 5, the three lines connecting the main contacts of the AC contactor KM and the load 5 are provided with an overload protection relay KH, and the break contacts of the overload protection relay KH are connected to the AC side control circuit 13.

[0022] The self-contained power supply electric control protection circuit for battery pack / inverter described in this embodiment realizes the function of local control of the circuit. During control, the DC control power circuit breaker QF in the electric control cabinet is closed, and the auxiliary contact of the DC control power circuit breaker QF is connected to the first indicator light branch 16, and the control power indicator light HL1 on the electric control cabinet panel lights up, and the AC power circuit breaker QL and the control power circuit breaker QL1 are closed in turn, and the whole circuit is in a ready state; press the inverter closing button SS on the electric control cabinet panel to connect the first control branch 14, and the operation signal relay KA coil on the first control branch 14 is energized and attracted, and the power-off delay relay KT coil is energized and attracted, and the auxiliary contact of the operation signal relay KA is automatically closed. The lock is on, the auxiliary contact of the running signal relay KA is closed to connect the second indicator light branch 17, and the system working indicator light HL2 on the electric control cabinet panel is on. At the same time, the auxiliary contact of the running signal relay KA is closed to connect the second control branch 15, and the DC contactor ZM coil on the second control branch 15 is energized and attracted. The main contact of the DC contactor ZM is closed to connect the DC battery group 2 and the DC input circuit of the inverter 3. The auxiliary contact of the DC contactor ZM is closed to connect the third indicator light branch 18, and the inverter closing indicator light HL3 on the electric control cabinet panel is on. The inverter 3 obtains DC power and responds After a certain time, the output voltage is AC380V, of which the AV220V control power supply is connected to the coil of the AC contactor KM on the AC side through the auxiliary contact of the running signal relay KA closed by the AC side control circuit 13, and the main contact of the AC contactor KM is attracted, and is sent to the load 5 (i.e., the stator winding of the three-phase asynchronous motor M) through the overload protection relay KH. The load 5 is energized and operates normally. At the same time, the auxiliary contact of the AC contactor KM is connected to the fourth indicator branch 19, and the load working indicator HL4 is on; press the inverter opening button SB on the electric control cabinet panel, and the first control Branch 14 is disconnected, the coil of the running signal relay KA loses power, and in the AC side control circuit 13, the closing auxiliary contact of the running signal relay KA opens, and the closing auxiliary contact disconnects the second indicator light branch 17, and the system working indicator light HL2 on the electric control cabinet panel goes out. At the same time, the closing auxiliary contact of the running signal relay KA opens, the coil of the AC contactor KM loses power, the main contact of the AC contactor KM is disconnected, and the load 5 loses power and stops running. At the same time, the closing auxiliary contact of the AC contactor KM opens, disconnects the fourth indicator light branch 19, and the load working indicator light HL4 on the electric control cabinet panel goes out;In the first and second control branches 14 and 15 of the DC control, the moving contact of the operation signal relay KA is opened, the coil of the power-off delay relay KT is de-energized, and the moving contact of the power-off delay relay KT is opened after N seconds (the user can set the delay time for the power-off delay relay KT as needed), and the coil of the DC contactor ZM on the second control branch 15 is de-energized, and the DC contactor ZM is released, and its main contact disconnects the DC battery pack 2 and the DC input circuit of the inverter 3. At the same time, the moving auxiliary contact of the DC contactor ZM is opened, disconnecting the third indicator light branch 18, and the inverter closing indicator light HL3 on the electric control cabinet panel is off. At this time, the DC control power circuit breaker QF is disconnected, and its auxiliary contact disconnects the first indicator light branch 16, and the control power indicator light HL1 on the electric control cabinet panel is off. ;

[0023] Embodiment 2:

[0024] On the basis of Example 1, the self-contained power supply electronic control protection circuit for the battery pack / inverter described in the present invention also includes a remote control receiver 4 connected to the module power supply 1 through a third control branch 20, and the remote control receiver 4 is equipped with an adaptive remote control transmitter 21, and the remote control receiver is used to receive the command signal of the remote control transmitter 21 and feed back the operation signal to the remote control transmitter 21 in real time; the remote control receiver 4 is provided with an inverter closing unit 22 and an inverter opening unit 23, and the inverter closing unit 22 is connected in parallel with the moving contact of the operation signal relay KA on the first control branch 14 through a line, and the inverter opening unit 23 is connected to the first control branch 14 through a line; the remote control transmitter 21 is provided with a remote control transmitter power switch 6, a remote control panel inverter closing button 7 and a remote control panel inverter opening button 8. Furthermore, the remote control transmitter 21 is also provided with a remote control panel control power indicator light 9, a remote control panel system working indicator light 10, a remote control panel inverter closing indicator light 11 and a remote control panel AC load working indicator light 12; the remote control receiver 3 includes an input module, which is provided with DI0 terminals, DI1 terminals, DI2 terminals, DI3 terminals and COM terminals for signal input, and the DI0 terminals, DI1 terminals, DI2 terminals, DI3 terminals and COM terminals of the input module are respectively connected to the moving contact of the DC control power circuit breaker QF, the moving contact of the operation signal relay KA, the moving contact of the DC contactor ZM, and the moving contact of the AC contactor KM.In this embodiment, the remote control receiver 4 and the remote control transmitter 21 are both provided with corresponding communication modules to establish communication, which are used to send command signals and complete corresponding functions according to the received corresponding commands. This technology belongs to the prior art and is not elaborated here; the remote control receiver 4 is used to receive the command signal of the remote control transmitter 21, and output the corresponding control command according to the command signal to complete the corresponding control, and at the same time, the operating status of each component can be fed back to the remote control transmitter 21, and the remote control transmitter 21 is used to send command information to the remote control receiver 4 and receive the information fed back by the remote control receiver 4. The remote control transmitter 21 has its own charging power supply; the inverter closing unit 22 and the inverter opening unit 23 are arranged on the remote control receiver 4 and connected to the first control branch 14. The inverter closing unit 22 and the inverter opening unit 23 are connected to the first control branch 14. Unit 23 realizes the functions of the normally open switch button and the normally closed switch button of the inverter closing button SS and the inverter opening button SB respectively, and can replace the inverter closing button SS and the inverter opening button SB to be connected to the first control branch 14 to realize the remote control of the protection circuit described in the present invention. It can also exist together with the inverter closing button SS and the inverter opening button SB in the first control branch 14 to realize the combined control of local control and remote control. When the remote control receiver 4 receives the inverter closing signal sent by the remote control transmitter 21, the function of the inverter closing unit 22 is completed through the remote control receiver 4, and the first control branch 14 is connected. When the remote control receiver 4 receives the inverter opening signal sent by the remote control transmitter 21, the function of the inverter opening unit 23 is realized through the remote control receiver 4, and the first control branch 14 is disconnected.

[0025] When the present invention is remotely controlled, the AC power circuit breaker QL, the control power circuit breaker QL1 and the DC control power circuit breaker QF in the electric control cabinet need to be closed in sequence, the remote control transmitter power switch 6 on the remote control transmitter 21 panel is turned on, the moving closing auxiliary contact of the DC control power circuit breaker QF connects to the DI0 end of the input module of the remote control receiver 4 and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4, the remote control transmitter 21 receives the signal and controls the remote control panel control power indicator light 9 on its panel to light up, the inverter closing button 7 on the remote control panel is pressed, and the remote control receiver 4 receives the signal. The inverter closing unit 22 is controlled to connect the first control branch 14, the coil of the operation signal relay KA on the first control branch 14 is energized and attracted, the coil of the power-off delay relay KT is energized and attracted, and the auxiliary contact of the operation signal relay KA is self-locked, and the auxiliary contact of the operation signal relay KA is connected to the DI1 end of the input module of the remote control receiver 4 and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4. The remote control transmitter 21 receives the signal and controls the remote control panel system working indicator light 10 to light up. At the same time, the auxiliary contact of the operation signal relay KA is closed, and the connection The second control branch 15 is connected, the DC contactor ZM coil on the second control branch 15 is energized and attracted, the DC contactor ZM main contact is closed to connect the DC battery pack 2 and the DC input circuit of the inverter 3, the DC contactor ZM dynamic closing auxiliary contact is connected to the remote control receiver 4 input module DI2 end and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4, the remote control transmitter 21 receives the signal and controls the inverter closing indicator 11 on the remote control panel to light up, the inverter 3 obtains DC power and after the response time, it outputs AC380V voltage, of which AV220V control voltage The source closes the auxiliary contact of the running signal relay KA through the AC side control loop 13, connects the coil of the AC contactor KM on the AC side, the main contact of the AC contactor KM is attracted, and sent to the load 5 (i.e., the stator winding of the three-phase asynchronous motor M) through the overload protection relay KH, the load 5 is powered and operates normally, at the same time, the auxiliary contact of the AC contactor KM is connected to the DI3 end of the input module of the remote control receiver 4 and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4, the remote control transmitter 21 receives the signal and controls the AC load working indicator 12 on the remote control panel to light up;Press the inverter trip button 8 on the remote control panel, the remote control receiver 4 receives the signal and disconnects the first control branch 14 through the inverter trip unit 23, the operation signal relay KA coil loses power, and in the AC side control loop 13, the operation signal relay KA dynamic closing auxiliary contact opens, the dynamic closing auxiliary contact disconnects the remote control receiver 4 input module DI1 end and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4, the remote control transmitter 21 receives the signal and controls the remote control panel system working indicator 10 to go out, at the same time, the operation signal relay KA dynamic closing auxiliary contact opens, the AC contactor KM coil loses power, the AC contactor KM main contact is disconnected, the load loses power and stops running, at the same time, the AC contactor KM dynamic closing auxiliary contact opens, disconnects the remote control receiver 4 input module DI3 end and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4, the remote control transmitter 21 receives the signal and controls the remote control panel AC load working indicator 12 to go out; in the first and second control branches 1 of the DC control 4. In 15, the closing contact of the operation signal relay KA is opened, the coil of the power-off delay relay KT is de-energized, and the closing contact of the power-off delay relay KT is opened after N seconds (the user can set the delay time for the power-off delay relay KT as needed), and the coil of the DC contactor ZM on the second control branch 15 is de-energized, and the DC contactor ZM is released, and its main contact disconnects the DC battery pack 2 and the DC input circuit of the inverter 3. At the same time, the closing auxiliary contact of the DC contactor ZM is opened, disconnecting the DI2 end of the input module of the remote control receiver 4 and sending a corresponding signal to the remote control transmitter 21 through the remote control receiver 4. The remote control transmitter 21 receives the signal and controls the inverter closing indicator light 11 on the remote control panel to go out. At this time, the DC control power circuit breaker QF is disconnected, and the closing auxiliary point of the DC control power circuit breaker QF disconnects the DI0 end of the input module of the remote control receiver 4 and sends a corresponding signal to the remote control transmitter 21 through the remote control receiver 4. The remote control transmitter 21 receives the signal and controls the control power indicator light 9 on the remote control panel to go out. In this embodiment, the remote control transmitter 21 receives the feedback signal sent by the remote control receiver 4 and controls the on or off of each indicator light, which can be completed by a conventional control circuit and will not be described here. ;

[0026] Embodiment 3:

[0027] On the basis of Example 1 and / or Example 2, the first control branch 14 is also provided with a moving-breaking contact of the PLC output relay KA25. The entire protection circuit is interlocked and controlled by the PLC, and the module power supply 1 of the operating signal relay KA in the protection circuit can be cut off as needed, thereby realizing instantaneous cutting off of the AC side power supply of the inverter 3 as in the above Example 1 or 2, and delayed cutting off of the DC side power supply of the inverter 3, thereby avoiding the occurrence of safety accidents.

Claims

1. A self-contained power supply electronic control protection circuit for a battery pack / inverter, characterized in that: The invention comprises a module power supply (1), a DC battery pack (2), an inverter (3), a load (5), a DC contactor (ZM), an operation signal relay (KA), an AC contactor (KM), a power-off delay relay (KT), an AC power circuit breaker (QL), a control power circuit breaker (QL1) and a DC control power circuit breaker (QF); the positive electrode of the DC battery pack (2) is connected to the module power supply (1) and the inverter (3) through a line, and the negative electrode is connected to the module power supply (1) and the inverter (3) through a line. The main contacts of the DC contactor (ZM) are connected to the lines of the DC battery pack (2) and the inverter (3); the U, V, and W output terminals of the inverter (3) are respectively connected to the load (5) through three lines, the main contacts of the AC power circuit breaker (QL) and the main contacts of the AC contactor (KM) are respectively connected to the three lines, and an AC side control circuit (1) is provided between one of the three lines between the AC power circuit breaker (QL) and the AC contactor (KM) and the N terminal of the inverter (3). 3), the AC side control circuit (13) is connected to the main contact of the control power circuit breaker (QL1), the moving contact of the operation signal relay (KA) and the coil of the AC contactor (KM); the module power supply (1) is connected to two parallel first control branches (14) and second control branches (15) through the DC control power circuit breaker (QF), the first control branch (14) is connected to the inverter closing button (SS), the inverter opening button (SB) and the coil of the operation signal relay (KA), and the second control branch (15) is connected to the inverter closing button (SS), the inverter opening button (SB) and the coil of the operation signal relay (KA), and the second control branch (15) is connected to the inverter closing button (SS), the inverter opening button (SB) and the coil of the operation signal relay (KA). The control branch (15) is connected to the moving contact of the operation signal relay (KA) and the coil of the DC contactor (ZM); the two ends of the inverter closing button (SS) on the first control branch (14) are also connected in parallel with the moving contact of the operation signal relay (KA), and the two ends of the coil of the operation signal relay (KA) are connected in parallel with the coil of the power-off delay relay (KT); the two ends of the moving contact of the operation signal relay (KA) on the second control branch (15) are connected in parallel with the moving contact of the power-off delay relay (KT); The module power supply (1) is also connected to an indicator light unit via a line, the indicator light unit comprising first, second, third and fourth indicator light branches (16, 17, 18 and 19) connected in parallel, the first indicator light branch (16) being connected to a control power indicator light (HL1) and a make contact of a DC control power circuit breaker (QF); the second indicator light branch (17) being connected to a system operation indicator light (HL2) and a make contact of an operation signal relay (KA); the third indicator light branch (18) being connected to an inverter closing indicator light (HL3) and a make contact of a DC contactor (ZM); and the fourth indicator light branch (19) being connected to a load operation indicator light (HL4) and a make contact of an AC contactor (KM); The three lines connecting the main contacts of the AC contactor (KM) and the load (5) are provided with an overload protection relay (KH), and the break contacts of the overload protection relay (KH) are connected to the AC side control circuit (13); The invention also comprises a remote control receiver (4) connected to the module power supply (1) via a third control branch (20), the remote control receiver (4) being equipped with a matching remote control transmitter (21) for receiving a command signal from the remote control transmitter (21) and feeding back an operation signal to the remote control transmitter (21) in real time; the remote control receiver (4) is provided with an inverter closing unit (22) and an inverter opening unit (23); the inverter closing unit (22) is connected in parallel with a moving contact of an operation signal relay (KA) on the first control branch (14) via a line, and the inverter opening unit (23) is connected to the first control branch (14) via a line; the remote control transmitter (21) is provided with a remote control transmitter power switch (6), a remote control panel inverter closing button (7), and a remote control panel inverter opening button (8).

2. The self-contained power supply electric control protection circuit for a battery pack / inverter according to claim 1, characterized in that: The remote control transmitter (21) is also provided with a remote control panel control power indicator light (9), a remote control panel system operating indicator light (10), a remote control panel inverter closing indicator light (11), and a remote control panel AC load operating indicator light (12); the remote control receiver (4) comprises an input module, wherein the DI0 terminal, DI1 terminal, DI2 terminal, DI3 terminal, and COM terminal of the input module are respectively connected to the moving contact of the DC control power circuit breaker (QF), the moving contact of the operation signal relay (KA), the moving contact of the DC contactor (ZM), and the moving contact of the AC contactor (KM).

3. The self-contained power supply electric control protection circuit for a battery pack / inverter according to claim 1, characterized in that: The first control branch (14) is also provided with a PLC output relay (KA25).

Images