Alternating-current solid-state power controller
By designing an AC solid-state power controller including a control terminal, a shutdown execution unit, a zero-crossing judgment unit and an overcurrent judgment unit, the problem of delayed shutdown during overcurrent and short-circuit protection is solved, and the immediate shutdown in overcurrent and short-circuit conditions is achieved, which extends the service life of the controller and improves the reliability and safety of the system.
Patent Information
- Application Number
- CN202311717876.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-13
- Publication Date
- 2025-06-13
AI Technical Summary
The AC solid-state power controller is shut down in a delayed manner during overcurrent and short-circuit protection, resulting in excessive instantaneous energy tolerance and may damage the controller.
An AC solid-state power controller is designed including a control terminal, a shutdown execution unit, a zero-crossing judgment unit and an overcurrent judgment unit. The high-voltage circuit is safely controlled by a low-voltage circuit, so as to realize zero voltage on, zero current off, and immediately perform shutdown in the case of overcurrent and short circuit.
Effectively prevent the AC solid-state power controller from being damaged in overcurrent and short circuit situations, extend the service life of the controller, and improve the reliability and safety of the system.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to the field of power electronics technology, and particularly relates to an AC solid-state power controller. Background Art
[0002] With the rapid development of microelectronics technology and chip process design, as the core control switch in the field of power electronics control, solid-state power controllers have been widely used in various power supply and distribution systems. In AC power distribution projects, AC solid-state power controllers are key components for realizing automated power distribution methods. They can not only improve the reliability and automation level of power distribution, make the equipment operate more reliably, but also extend the service life of the equipment. Therefore, the research and design of AC solid-state power controllers are of great significance for the intelligent and digital development of equipment.
[0003] In an AC system, in order to reduce electromagnetic interference to the power supply system and the environment, and at the same time reduce the switching losses of power transistors during the on and off processes, it is required that the control system has the function of turning on the solid-state power switch when the line voltage passes through zero and turning off when the line current passes through zero. In an actual circuit, after a turn-off command is issued, it takes a certain period of time for the current on the power loop to pass through zero before zero-current turn-off can be executed. However, in the case of overcurrent and short-circuit protection, the delayed turn-off will cause the AC solid-state power controller to instantaneously withstand a large amount of energy, resulting in damage to the AC solid-state power controller. Therefore, in the design of an AC solid-state power controller, not only zero-voltage turn-on and zero-current turn-off need to be satisfied, but also immediate turn-off must be considered in the case of overcurrent and short-circuit protection.
[0004] For this reason, a technical solution is needed that can achieve zero-voltage turn-on and zero-current turn-off while quickly turning off in the case of overcurrent and short-circuit, and extend the service life of the solid-state power controller itself. Summary of the Invention
[0005] The present application aims to provide an AC solid-state power controller that can achieve zero-voltage turn-on and zero-current turn-off while quickly turning off in the case of overcurrent and short-circuit, and extend the service life of the solid-state power controller itself.
[0006] According to one aspect of the present application, there is provided an AC solid-state power controller, including: a control terminal, a turn-off execution unit, a zero-crossing judgment unit, an overcurrent judgment unit, and a power supply unit, wherein:
[0007] The control terminal is used to control the on and / or off of the AC solid-state power controller, and the control terminal includes a first control signal output terminal;
[0008] The shutdown execution unit is connected in series in the AC circuit, and performs conduction and / or shutdown according to the control signal from the control end and the logic signal fed back by the zero-crossing judgment unit and / or the overcurrent judgment unit. The shutdown execution unit includes: a first control signal input end, a first sampling port, a second sampling port, a first signal feedback port, a second signal feedback port and a third signal feedback port, wherein the first control signal input end is electrically connected to the first control signal output end;
[0009] The zero-crossing judgment unit includes a first sampling terminal, a second sampling terminal, a first signal feedback terminal, a second signal feedback terminal, a first signal receiving terminal, and a second signal receiving terminal, wherein the first sampling terminal is electrically connected to the first sampling port, the second sampling terminal is electrically connected to the second sampling port, the first signal feedback terminal is electrically connected to the first signal feedback port, and the second signal feedback terminal is electrically connected to the second signal feedback port, and the zero-crossing judgment unit converts the collected voltage signal into a logic signal and feeds it back to the shutdown execution unit;
[0010] The overcurrent judgment unit includes a third sampling terminal, a fourth sampling terminal and a third signal feedback terminal, the third sampling terminal is electrically connected to the first sampling port, the fourth sampling terminal is electrically connected to the second sampling port, and the third signal feedback terminal is electrically connected to the third signal feedback port. The overcurrent judgment unit converts the collected voltage signal into a logic signal and feeds it back to the shutdown execution unit;
[0011] The power supply unit is used to convert single-phase alternating current into a low-voltage direct current power supply, and to supply power to the shutdown execution unit, the zero-crossing judgment unit, and the overcurrent judgment unit. The power supply unit also includes: a first signal output end and a second signal output end. The first signal output end is electrically connected to the first signal receiving end, and the second signal output end is electrically connected to the second signal receiving end.
[0012] According to some embodiments, the control end includes an independent low-voltage power supply and an optical coupler to achieve electrical isolation between the control end and the AC circuit.
[0013] According to some embodiments, the shutdown execution unit includes a first field effect transistor and a second field effect transistor, the first field effect transistor includes a first control end, the second field effect transistor includes a second control end, the first field effect transistor and the second field effect transistor are connected in series in the controlled AC circuit, and the conduction and / or shutdown of the AC circuit are achieved by controlling the first control end and the second control end.
[0014] According to some embodiments, the turn-off execution unit includes a turn-off execution control chip, which processes the control signal from the first control signal input terminal and the electrical signals fed back from the first signal feedback port, the second signal feedback port, and / or the third signal feedback port, and then outputs a first control turn-off / turn-on control signal and a second turn-off / turn-on control signal. The first control turn-off / turn-on control signal is transmitted to the first control terminal, and the second turn-off / turn-on control signal is transmitted to the second control terminal.
[0015] According to some embodiments, the zero-crossing judgment unit includes a zero-crossing judgment sub-unit and a logic transformation sub-unit, where:
[0016] The zero-crossing judgment sub-unit includes a first sampling input terminal, a second sampling input terminal, a first operational amplifier output terminal, and a second operational amplifier output terminal. The first sampling input terminal is electrically connected to the first sampling terminal, and the second sampling input terminal is electrically connected to the second sampling terminal;
[0017] The logic transformation sub-unit includes a first operational amplifier input terminal, a second operational amplifier input terminal, a first signal receiving port, a second signal receiving port, a first signal feedback port, and a second signal feedback port. The first operational amplifier input terminal is electrically connected to the first operational amplifier output terminal, the second operational amplifier input terminal is electrically connected to the second operational amplifier output terminal, the first signal receiving port is electrically connected to the first signal receiving end, the second signal receiving port is electrically connected to the second signal receiving end, the first signal feedback port is electrically connected to the first signal feedback terminal, and the second signal feedback port is electrically connected to the second signal feedback terminal.
[0018] According to some embodiments, the zero-crossing judgment sub-unit includes a first operational amplifier comparison chip, which performs zero-crossing comparison and amplification on the collected voltage signal and then transmits it to the logic transformation sub-unit.
[0019] According to some embodiments, the logic transformation sub-unit includes a plurality of NAND gate logic circuits, which convert the amplified electrical signal into a logic signal and feed it back to the turn-off execution unit.
[0020] According to some embodiments, the overcurrent judgment unit includes a second operational amplifier comparison chip, which is used to judge the overcurrent and / or short circuit of the AC circuit where it is located. When an overcurrent and / or short circuit occurs, the overcurrent turn-off unit outputs a high-level turn-off signal to the turn-off execution unit at the third signal feedback terminal, so as to realize overcurrent and / or short circuit protection.
[0021] According to some embodiments, the overcurrent judgment unit further includes an optocoupler, which is used to compare the set voltage threshold in the second operational amplifier comparison chip circuit by applying the optocoupler, so that the overcurrent shutdown unit maintains an output high-level shutdown signal to the shutdown execution unit after the overcurrent and / or short-circuit conditions are eliminated, thereby avoiding secondary overcurrent and / or short-circuit.
[0022] According to some embodiments, the power supply unit includes a group of optocouplers, and an isolated DC power supply is output by applying the optocouplers.
[0023] According to the embodiments of the present application, the AC solid-state power controller is controlled through the control terminal to achieve safe control of the high-voltage circuit through the low-voltage circuit. Cooperating with the zero-crossing judgment unit and the shutdown execution unit to achieve a slow-on and slow-off mode of zero-voltage turn-on and zero-current turn-off, preventing current impact during startup and shutdown instants, avoiding excessive current load on the AC circuit where it is located, and effectively improving the reliability of the system. Through the overcurrent judgment unit and the shutdown execution unit, immediate shutdown is performed in the case of overcurrent and short-circuit, avoiding damage to the AC solid-state power controller itself and the circuit equipment where it is located due to overcurrent and short-circuit, and extending the service life of the AC solid-state power controller itself. The power supply unit provides an isolated DC power supply to the zero-crossing judgment unit, the overcurrent judgment unit, and the shutdown execution unit, improving safety.
[0024] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for description in the embodiments will be briefly introduced below.
[0026] Figure 1 The schematic diagram of the device of the AC solid-state power controller according to an exemplary embodiment is shown.
[0027] Figure 2 The schematic circuit diagram of the control terminal of the AC solid-state power controller according to an exemplary embodiment is shown.
[0028] Figure 3 The schematic circuit diagram of the shutdown execution unit of the AC solid-state power controller according to an exemplary embodiment is shown.
[0029] Figure 4 The schematic diagram of the zero-crossing judgment unit device of the AC solid-state power controller according to an exemplary embodiment is shown.
[0030] Figure 5 The schematic circuit diagram of the overcurrent judgment unit of the AC solid-state power controller according to an exemplary embodiment is shown.
[0031] Figure 6 The circuit schematic diagram of the power supply unit of an AC solid-state power controller according to an exemplary embodiment is shown. Detailed implementation manners
[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar parts, and thus their repetitive description will be omitted.
[0033] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of this application. However, those skilled in the art will realize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring aspects of this application.
[0034] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.
[0035] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the content and operations / steps, nor do they necessarily have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.
[0036] It should be understood that although terms such as first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below can be referred to as the second component without departing from the teachings of the concept of this application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0037] The user information involved in this application (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) are all information and data that have been authorized by the user or fully authorized by all parties. Moreover, the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or refuse.
[0038] Those skilled in the art can understand that the drawings are only schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing this application. Therefore, they cannot be used to limit the protection scope of this application.
[0039] In an AC power distribution project, the AC solid-state power controller is a key component for realizing an automated power distribution method. It can not only improve the power distribution reliability and automation level, making the equipment operate more reliably, but also extend the service life of the equipment. In an AC system, in order to reduce the electromagnetic interference to the power supply system and the environment, and at the same time to reduce the switching losses of the power transistors during the on and off processes, it is required that the control system has the function of turning on the solid-state power switch when the line voltage passes through zero and turning off when the line current passes through zero.
[0040] In an actual circuit, after the turn-off instruction is issued, it takes a certain period of time for the current on the power loop to pass through zero before zero-current turn-off can be executed. However, in the case of overcurrent and short-circuit protection, the delayed turn-off will cause the AC solid-state power controller to instantaneously withstand a large amount of energy, resulting in the damage of the AC solid-state power controller. Therefore, in the design of the AC solid-state power controller, not only zero-voltage turn-on and zero-current turn-off need to be satisfied, but also immediate turn-off must be considered in the case of overcurrent and short-circuit protection.
[0041] For this reason, this application proposes an AC solid-state power controller that can quickly turn off in the case of overcurrent and short-circuit while achieving zero-voltage turn-on and zero-current turn-off, and extend the service life of the solid-state power controller itself.
[0042] According to an embodiment, the AC solid-state power controller is controlled through the control terminal, so as to achieve the safe control of a high-voltage circuit through a low-voltage circuit. Cooperating with the zero-crossing judgment unit and the turn-off execution unit, a slow turn-on and slow turn-off mode with zero-voltage turn-on and zero-current turn-off is realized, preventing current impact during startup and turn-off instants, avoiding excessive current load on the AC circuit where it is located, and effectively improving the reliability of the system. Through the overcurrent judgment unit and the turn-off execution unit, turn-off is immediately executed under overcurrent and short-circuit conditions, avoiding damage to the AC solid-state power controller itself and the circuit equipment where it is located caused by overcurrent and short-circuit, and extending the service life of the AC solid-state power controller itself. The power supply unit provides an isolated DC power supply to the zero-crossing judgment unit, the overcurrent judgment unit, and the turn-off execution unit, improving safety.
[0043] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
[0044] Figure 1 The schematic diagram of the device of the AC solid-state power controller according to the exemplary embodiment is shown.
[0045] See Figure 1 , in the figure, an AC solid-state power controller is shown, including: a control terminal 1001, a turn-off execution unit 1003, a zero-crossing judgment unit 1005, an overcurrent judgment unit 1007, and a power supply unit 1009, where:
[0046] The control terminal 1001 is used to control the turn-on and / or turn-off of the AC solid-state power controller, and the control terminal 1001 includes a first control signal output terminal 100101.
[0047] According to some embodiments, the AC solid-state power controller shown in the figure includes: a control terminal 1001, a turn-off execution unit 1003, a zero-crossing judgment unit 1005, an overcurrent judgment unit 1007, and a power supply unit 1009. Wherein the control terminal 1001 is used to control the turn-on and / or turn-off of the AC solid-state power controller, and the AC solid-state power controller is controlled to be turned on or off through the control terminal 1001, so as to further control the turn-on or turn-off of the AC circuit where the AC solid-state power controller is located.
[0048] According to some embodiments, the control terminal 1001 includes a first control signal output terminal 100101, which is used to output a control signal to the turn-off execution unit 1003, and the turn-off execution unit 1003 executes the turn-on or turn-off operation.
[0049] According to some embodiments, the control terminal 1001 is powered by a separate DC power supply and is electrically isolated from the AC circuit where it is located, improving the safety of personnel operation.
[0050] The shutdown execution unit 1003 is connected in series in the AC circuit and performs conduction and / or shutdown according to the control signal from the control terminal 1001 and the logic signals fed back by the zero-crossing judgment unit 1005 and / or the overcurrent judgment unit 1007. The shutdown execution unit 1003 includes: a first control signal input terminal 100311, a first sampling port 100301, a second sampling port 100303, a first signal feedback port 100305, a second signal feedback port 100307, and a third signal feedback port 100309. The first control signal input terminal 100311 is electrically connected to the first control signal output terminal 100101.
[0051] According to some embodiments, the shutdown execution unit 1003 is connected in series in the AC circuit. Inside the shutdown execution unit 1003, there is a field effect transistor for controlling the shutdown or conduction of the circuit. The field effect transistor is connected in series in the AC circuit to be controlled to control the shutdown or conduction of the AC circuit where it is located.
[0052] According to some embodiments, the shutdown control unit 1003 performs conduction or shutdown according to the control signal from the control terminal 1001 and the logic signal fed back by the zero-crossing judgment unit 1005, realizing zero-voltage conduction and / or zero-current shutdown.
[0053] According to some embodiments, the shutdown control unit 1003 performs conduction and / or shutdown according to the logic signal fed back by the overcurrent judgment unit 1007. The overcurrent judgment unit 1007 judges whether there is an overcurrent or short-circuit situation by sampling the voltage of the AC circuit where it is located. When an overcurrent or short-circuit situation occurs in the AC circuit where it is located, the overcurrent judgment unit 1007 feeds back a logic signal to the shutdown control unit 1003, and the shutdown control unit 1003 immediately shuts down the AC circuit where it is located.
[0054] According to some embodiments, see Figure 1, the turn-off execution unit 1003 includes: a first control signal input terminal 100311, a first sampling port 100301, a second sampling port 100303, a first signal feedback port 100305, a second signal feedback port 100307, and a third signal feedback port 100309. The first control signal input terminal 100311 is electrically connected to the first control signal output terminal 100101 to receive a first control signal from the control terminal. The first sampling port 100301 and the second sampling port 100303 are used to connect the sampling terminals of the zero-crossing judgment unit and the over-current judgment unit. The first signal feedback port 100305, the second signal feedback port 100307, and the third signal feedback port 100309 are respectively used to receive the logic signals fed back from the zero-crossing judgment unit and the over-current judgment unit.
[0055] The zero-crossing judgment unit 1005 includes a first sampling terminal 100501, a second sampling terminal 100503, a first signal feedback terminal 100509, a second signal feedback terminal 100511, a first signal receiving end 100505, and a second signal receiving end 100507. The first sampling terminal 100501 is electrically connected to the first sampling port 100301, the second sampling terminal 100503 is electrically connected to the second sampling port 100303, the first signal feedback terminal 100509 is electrically connected to the first signal feedback port 100305, and the second signal feedback terminal 100511 is electrically connected to the second signal feedback port 100307. The zero-crossing judgment unit 1005 converts the collected voltage signal into a logic signal and feeds it back to the turn-off execution unit 1003.
[0056] According to some embodiments, refer to Figure 1 , the zero-crossing judgment unit 1005 includes a first sampling terminal 100501, a second sampling terminal 100503, a first signal feedback terminal 100509, a second signal feedback terminal 100511, a first signal receiving end 100505, and a second signal receiving end 100507. Among them, the first sampling terminal 100501 is electrically connected to the first sampling port 100301, the second sampling terminal 100503 is electrically connected to the second sampling port 100303. The voltage in the circuit where they are located is collected through the first sampling terminal 100501 and the second sampling terminal 100503, and the judgment of voltage zero-crossing and / or current zero-crossing is performed inside the unit.
[0057] According to some embodiments, the first signal feedback terminal 100509 is electrically connected to the first signal feedback port 100305, and the second signal feedback terminal 100511 is electrically connected to the second signal feedback port 100307. After judging whether the voltage and / or current passes through zero inside the zero-crossing judgment unit 1005, the judgment result is converted into a logic signal, and the logic signal is fed back to the turn-off execution unit 1003 through the first signal feedback terminal 100509 and the second signal feedback terminal 100511. The turn-off execution unit 1003 conducts or turns off the AC circuit where it is located based on the first control signal at the comprehensive control end and the fed-back logic signal.
[0058] The overcurrent judgment unit 1007 includes a third sampling terminal 100703, a fourth sampling terminal 100705, and a third signal feedback terminal 100701. The third sampling terminal 100703 is electrically connected to the first sampling port 100301, the fourth sampling terminal 100705 is electrically connected to the second sampling port 100303, and the third signal feedback terminal 100701 is electrically connected to the third signal feedback port 100309. The overcurrent judgment unit 1007 converts the collected voltage signal into a logic signal and feeds it back to the turn-off execution unit 1003.
[0059] According to some embodiments, the overcurrent judgment unit 1007 includes a third sampling terminal 100703, a fourth sampling terminal 100705, and a third signal feedback terminal 100701. Among them, the third sampling terminal 100703 is electrically connected to the first sampling port 100301, and the fourth sampling terminal 100705 is electrically connected to the second sampling port 100303. The overcurrent judgment unit collects the voltage in the circuit where it is located through the third sampling terminal 100703 and the fourth sampling terminal 100705, and judges whether there is overcurrent or short circuit in the AC circuit where it is located inside the unit.
[0060] According to some embodiments, the third signal feedback terminal 100701 is electrically connected to the third signal feedback port 100309. The overcurrent judgment unit 1007 judges whether there is overcurrent or short circuit by collecting the voltage signal of the AC circuit where it is located, and feeds back different logic signals to the turn-off execution unit 1003, so that the turn-off execution unit 1003 performs an immediate turn-off process when an overcurrent short circuit occurs.
[0061] The power supply unit 1009 is used to convert single-phase alternating current into a low-voltage direct current power supply and supply power to the turn-off execution unit 1003, the zero-crossing judgment unit 1005, and the overcurrent judgment unit 1007. The power supply unit 1009 further includes: a first signal output terminal 100901 and a second signal output terminal 100902. The first signal output terminal 100901 is electrically connected to the first signal receiving terminal 100505, and the second signal output terminal 100902 is electrically connected to the second signal receiving terminal 100507.
[0062] According to some embodiments, the power supply unit 1009 is used to convert single-phase alternating current into a low-voltage direct current power supply and supply power to the turn-off execution unit 1003, the zero-crossing judgment unit 1005, and the overcurrent judgment unit 1007. Similarly, it also supplies power to the first control signal generation branch in the control terminal 1001.
[0063] According to - some embodiments, refer to Figure 1 , the power supply unit 1009 further includes: a first signal output terminal 100901 and a second signal output terminal 100902. Among them, the first signal output terminal 100901 is electrically connected to the first signal receiving terminal 100505, and the second signal output terminal 100902 is electrically connected to the second signal receiving terminal 100507, providing a stable periodic pulse signal for the zero-crossing judgment unit 1005 and being used for the logic signal conversion in the zero-crossing judgment unit 1005.
[0064] According to some embodiments, the AC solid-state power controller in the present invention adopts an independent control terminal power supply and an isolated DC power supply, improving the safety of the AC solid-state power controller.
[0065] Figure 2 Shows the circuit schematic diagram of the control terminal of the AC solid-state power controller according to an exemplary embodiment.
[0066] Refer to Figure 2 , Figure 2 shows the control terminal of the AC solid-state power controller, and the control terminal includes an independent low-voltage power supply and an optocoupler to achieve electrical isolation between the control terminal and the AC circuit.
[0067] According to some embodiments, the control terminal includes an independent low-voltage power supply. Taking the figure as an example, the low-voltage power supply can use 24V direct current.
[0068] According to some embodiments, the control terminal further includes an optocoupler U3, refer to Figure 2When VCC24V is connected, the optocoupler pins 1 and 2 are turned on, the control terminals 3 and 4 are turned on, and the first control signal is output at the first control signal output terminal 100101.
[0069] According to some embodiments, the optical coupler in the control end realizes electrical isolation between the control end and the AC circuit, thereby improving the safety of the AC solid-state power controller.
[0070] Figure 3 A circuit schematic diagram of a shutdown execution unit of an AC solid-state power controller according to an example embodiment is shown.
[0071] See also Figure 3 The shutdown execution unit 1003 includes a first field effect transistor Q1 and a second field effect transistor Q2. The first field effect transistor includes a first control end, and the second field effect transistor includes a second control end. The first field effect transistor Q1 and the second field effect transistor Q2 are connected in series in the controlled AC circuit. The AC circuit is turned on and / or off by controlling the first control end and the second control end.
[0072] According to some embodiments, the shutdown execution unit 1003 includes a first field effect transistor Q1 and a second field effect transistor Q2, the first field effect transistor includes a first control end, the second field effect transistor includes a second control end, the first field effect transistor Q1 and the second field effect transistor Q2 are connected in series in the controlled AC circuit, and an on or off signal is sent to the first control end and the second control end inside the shutdown execution unit to control the conduction and / or shutdown of the AC circuit.
[0073] The shutdown execution unit 1003 includes a shutdown execution control chip 100313. The shutdown execution control chip 100313 processes the control signal from the first control signal input terminal 100311 and the electrical signal fed back from the first signal feedback port 100305, the second signal feedback port 100307 and / or the third signal feedback port 100309, and then outputs a first control shutdown / on control signal and a second shutdown / on control signal. The first control shutdown / on control signal is transmitted to the first control terminal, and the second shutdown / on control signal is transmitted to the second control terminal.
[0074] According to some embodiments, the turn-off execution unit 1003 includes a turn-off execution control chip 100313. The turn-off execution control chip 100313 processes the control signal from the first control signal input terminal 100311 and the signals from the first signal feedback port 100305 and the second signal feedback port 100307, and then outputs the first control turn-off / turn-on control signal and the second turn-off / turn-on control signal to control the first field-effect transistor Q1 and the second field-effect transistor Q2 to perform conduction or turn-off on the AC circuit where they are located.
[0075] According to some embodiments, the turn-off execution control chip 100313 processes the electrical signal fed back from the third signal feedback port 100309 and then outputs the first control turn-off / turn-on control signal and the second turn-off / turn-on control signal to control the first field-effect transistor Q1 and the second field-effect transistor Q2 to immediately turn off the AC circuit where they are located, so as to prevent damage to the devices in the AC circuit and the AC solid-state power controller itself in case of overcurrent or short circuit.
[0076] Figure 4 Schematic diagram of the zero-crossing judgment unit device of the AC solid-state power controller according to an exemplary embodiment.
[0077] See Figure 4 , the zero-crossing judgment unit 1005 includes a zero-crossing judgment subunit 10051 and a logic transformation subunit 10052, wherein:
[0078] The zero-crossing judgment subunit 10051 includes a first sampling input terminal 100512, a second sampling input terminal 100513, a first operational amplifier output terminal 100514, and a second operational amplifier output terminal 100515. The first sampling input terminal 100512 is electrically connected to the first sampling terminal 100501, and the second sampling input terminal 100513 is electrically connected to the second sampling terminal 100503.
[0079] According to some embodiments, the zero-crossing judgment unit 1005 includes a zero-crossing judgment subunit 10051 and a logic transformation subunit 10052. The zero-crossing judgment subunit 10051 is used for judging voltage zero-crossing and / or current zero-crossing and amplifying the collected voltage signal for subsequent logic conversion. The logic transformation subunit 10052 is used for performing logic conversion on the amplified electrical signal output by the zero-crossing judgment subunit and finally outputting the converted logic signal.
[0080] According to some embodiments, the zero-crossing judgment subunit 10051 includes a first sampling input terminal 100512, a second sampling input terminal 100513, a first operational amplifier output terminal 100514, and a second operational amplifier output terminal 100515. The first sampling input terminal 100512 is electrically connected to the first sampling terminal 100501, and the second sampling input terminal 100513 is electrically connected to the second sampling terminal 100503. The zero-crossing judgment subunit 10051 receives the collected voltage signals through the first sampling input terminal 100512 and the second sampling input terminal 100513. After performing zero-crossing judgment and amplification on the collected voltage signals, the amplified voltage sampling signals are transmitted to the logic transformation subunit 10052 through the first operational amplifier output terminal 100514 and the second operational amplifier output terminal 100515.
[0081] The logic transformation subunit 10052 includes a first operational amplifier input terminal 100521, a second operational amplifier input terminal 100522, a first signal receiving port 100523, a second signal receiving port 100524, a first signal feedback port 100525, and a second signal feedback port 100526. The first operational amplifier input terminal 100521 is electrically connected to the first operational amplifier output terminal 100514, the second operational amplifier input terminal 100522 is electrically connected to the second operational amplifier output terminal 100515, the first signal receiving port 100523 is electrically connected to the first signal receiving terminal 100505, the second signal receiving port 100524 is electrically connected to the second signal receiving terminal 100507, the first signal feedback port 100525 is electrically connected to the first signal feedback terminal 100509, and the second signal feedback port 100526 is electrically connected to the second signal feedback terminal 100511.
[0082] The zero-crossing judgment subunit 10051 includes a first operational amplifier comparison chip, which performs zero-crossing comparison and amplification on the collected voltage signals and then transmits them to the logic transformation subunit 10052.
[0083] The logic transformation subunit 10052 includes a plurality of NAND gate logic circuits, which convert the amplified electrical signals into logic signals and feedback them to the turn-off execution unit 1003.
[0084] According to some embodiments, the logic transformation subunit 10052 includes a first operational amplifier input terminal 100521, a second operational amplifier input terminal 100522, a first signal receiving port 100523, a second signal receiving port 100524, a first signal feedback port 100525, and a second signal feedback port 100526. The first operational amplifier input terminal 100521 is electrically connected to the first operational amplifier output terminal 100514, and the second operational amplifier input terminal 100522 is electrically connected to the second operational amplifier output terminal 100515. The amplified voltage signal output from the zero-crossing judgment subunit 10051 is received, and the voltage signal is subjected to logic transformation through a logic transformation branch in the logic transformation subunit 10052.
[0085] According to some embodiments, the first signal receiving port 100523 is electrically connected to the first signal receiving end 100505, and the second signal receiving port 100524 is electrically connected to the second signal receiving end 100507. The logic transformation subunit 10052 receives a periodic pulse signal provided by the power supply unit through the first signal receiving port 100523 and the second signal receiving port 100524, and the periodic pulse signal is used to implement logic transformation.
[0086] According to some embodiments, the first signal feedback port 100525 is electrically connected to the first signal feedback terminal 100509, and the second signal feedback port 100526 is electrically connected to the second signal feedback terminal 100511. After the logic signal subunit 10052 converts the amplified voltage signal into a logic signal, it outputs the logic signal to the turn-off execution unit 1003 through the first signal feedback port 100525 and the second signal feedback port 100526.
[0087] Figure 5 Shows the circuit schematic diagram of the overcurrent judgment unit of the AC solid-state power controller according to an exemplary embodiment.
[0088] See Figure 5 , the overcurrent judgment unit 1007 includes a second operational amplifier comparison chip 10071 for judging the overcurrent and / or short circuit of the AC circuit where it is located. When an overcurrent and / or short circuit occurs, the overcurrent turn-off subunit outputs a high-level turn-off signal to the turn-off execution unit 1003 at the third signal feedback terminal, thereby realizing overcurrent and / or short circuit protection.
[0089] According to some embodiments, the overcurrent judgment unit 1007 includes a second operational amplifier comparison chip 10071. As shown in the figure, the second operational amplifier comparison chip 10071 is used to judge the overcurrent and / or short circuit of the AC circuit where it is located. When an overcurrent and / or short circuit occurs in the AC circuit where it is located, the overcurrent shutdown unit outputs a high-level shutdown signal to the shutdown execution unit 1003 at the third signal feedback terminal, thereby realizing overcurrent and / or short circuit protection.
[0090] As Figure 5 shown, the overcurrent judgment unit 1007 further includes an optocoupler U5. By applying the voltage threshold set in the circuit of the optocoupler U5 and the second operational amplifier comparison chip, the overcurrent shutdown unit maintains the output of a high-level shutdown signal to the shutdown execution unit after the overcurrent and / or short circuit situation is eliminated, thereby avoiding secondary overcurrent and / or short circuit.
[0091] According to some embodiments, referring to Figure 5 , two identical voltage thresholds are respectively set at the 2nd and 6th pins of the second operational amplifier comparison chip 10071. When an overcurrent or short circuit occurs, the voltages collected by the third sampling terminal 100703 and the fourth sampling terminal 100705 increase and exceed the set voltage threshold. Then, the 1st and 7th pins of the second operational amplifier comparison chip 10071 output high levels. The level of the 1st pin of the optocoupler U5 is pulled up from low, and the level of the 4th pin is pulled up from low and locks the level of the 1st pin to be always high. Even if the overcurrent state is eliminated at this time and the voltages of the third sampling terminal 100703 and the fourth sampling terminal 100705 drop and are lower than the set voltage threshold, the 3rd pin of the optocoupler U5 remains locked at a high level.
[0092] According to some embodiments, since the 4th pin of the optocoupler U5 is electrically connected to the third signal feedback port 100309 in the shutdown execution unit 1003, if this pin is at a low level, the shutdown execution unit 1003 maintains its original working state. If this pin is at a high level, the shutdown execution unit 1003 immediately issues a control signal to turn off the internal field effect transistor, achieving the function of immediately shutting down the protection circuit in case of overcurrent or short circuit.
[0093] According to some embodiments, referring to Figure 5 Figure (a) in, the overcurrent judgment unit 1007 further includes a tripping branch. When an overcurrent or short circuit occurs, the overcurrent judgment unit 1007 outputs a high level to the third signal feedback terminal 100701. At this time, the control terminals 1 and 2 of the optocoupler U4 are turned on, and the controlled terminals 3 and 4 are turned on to control the tripping and power-off of the AC circuit where it is located.
[0094] Figure 6 Shows the circuit schematic diagram of the power supply unit of an AC solid-state power controller according to an exemplary embodiment.
[0095] See Figure 6 , the power supply unit 1009 includes a group of optocouplers, and by applying the optocouplers, an isolated DC power supply is output.
[0096] According to some embodiments, the power supply unit 1009 includes a group of optocouplers U1 and U2. By applying the optocouplers U1 and U2 to conduct alternately in each positive and negative half-cycle of each cycle signal of single-phase alternating current, the single-phase alternating current is converted into direct current, and in cooperation with the voltage-dividing resistors in the circuit, an isolated DC power supply is output.
[0097] According to some embodiments, the AC solid-state power controller of the present invention is controlled through a low-voltage control terminal, so as to realize the safe control of the high-voltage circuit through the low-voltage circuit. In cooperation with the zero-crossing judgment unit and the turn-off execution unit, a slow-on and slow-off mode of zero-voltage turn-on and zero-current turn-off is realized, preventing current impact during startup and turn-off moments, avoiding excessive current load on the AC circuit where it is located, and effectively improving the reliability of the system.
[0098] According to some embodiments, the AC solid-state power controller of the present invention realizes over-current and short-circuit protection of the AC circuit where it is located through the over-current judgment unit and the turn-off execution unit. It immediately executes turn-off in the over-current and short-circuit states, avoiding damage to the AC solid-state power controller itself and the circuit equipment where it is located caused by over-current and short-circuit, and extending the service life of the AC solid-state power controller itself. While providing over-current and short-circuit protection, a tripping branch is added to the over-current judgment unit to provide multiple over-current and short-circuit guarantees for the circuit, making it safer and more reliable.
[0099] According to some embodiments, the AC solid-state power controller of the present invention is powered by the isolated DC power supply provided by the power supply unit for the zero-crossing judgment unit, the over-current judgment unit and the turn-off execution unit, with higher safety.
[0100] The "unit" and "module" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.
[0101] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.
[0102] In the above embodiments, the descriptions of the various embodiments each have their own emphasis. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.
[0103] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some service interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.
[0104] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0105] In the above embodiments, the descriptions of the various embodiments each have their own emphasis. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.
[0106] The above specifically shows and describes the exemplary embodiments of the present application. It should be understood that the present application is not limited to the detailed structure, setting method or implementation method described here; on the contrary, the present application is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.
Claims
1. An AC solid-state power controller, It is characterized in that include: Control terminal, shutdown execution unit, zero-crossing judgment unit, overcurrent judgment unit, power supply unit, wherein: The control end is used to control the on and / or off of the AC solid-state power controller, and the control end includes a first control signal output end; The shutdown execution unit is connected in series in the AC circuit, and performs conduction and / or shutdown according to the control signal from the control end and the logic signal fed back by the zero-crossing judgment unit and / or the overcurrent judgment unit. The shutdown execution unit includes: a first control signal input end, a first sampling port, a second sampling port, a first signal feedback port, a second signal feedback port and a third signal feedback port, wherein the first control signal input end is electrically connected to the first control signal output end; The zero-crossing judgment unit includes a first sampling terminal, a second sampling terminal, a first signal feedback terminal, a second signal feedback terminal, a first signal receiving terminal, and a second signal receiving terminal, wherein the first sampling terminal is electrically connected to the first sampling port, the second sampling terminal is electrically connected to the second sampling port, the first signal feedback terminal is electrically connected to the first signal feedback port, and the second signal feedback terminal is electrically connected to the second signal feedback port, and the zero-crossing judgment unit converts the collected voltage signal into a logic signal and feeds it back to the shutdown execution unit; The overcurrent judgment unit includes a third sampling terminal, a fourth sampling terminal and a third signal feedback terminal, the third sampling terminal is electrically connected to the first sampling port, the fourth sampling terminal is electrically connected to the second sampling port, and the third signal feedback terminal is electrically connected to the third signal feedback port. The overcurrent judgment unit converts the collected voltage signal into a logic signal and feeds it back to the shutdown execution unit; The power supply unit is used to convert single-phase alternating current into a low-voltage direct current power supply, and to supply power to the shutdown execution unit, the zero-crossing judgment unit, and the overcurrent judgment unit. The power supply unit also includes: a first signal output end and a second signal output end. The first signal output end is electrically connected to the first signal receiving end, and the second signal output end is electrically connected to the second signal receiving end.
2. The AC solid-state power controller according to claim 1, It is characterized in that The control end includes an independent low-voltage power supply and an optical coupler to achieve electrical isolation between the control end and the AC circuit.
3. The AC solid-state power controller according to claim 1, It is characterized in that The shutdown execution unit includes a first field effect transistor and a second field effect transistor, the first field effect transistor includes a first control end, the second field effect transistor includes a second control end, the first field effect transistor and the second field effect transistor are connected in series in the controlled AC circuit, and the conduction and / or shutdown of the AC circuit are achieved by controlling the first control end and the second control end.
4. The AC solid-state power controller according to claim 3, It is characterized in that The turn-off execution unit includes a turn-off execution control chip. The turn-off execution control chip processes the control signal from the first control signal input terminal and the electrical signals fed back from the first signal feedback port, the second signal feedback port, and / or the third signal feedback port, and then outputs a first control turn-off / turn-on control signal and a second turn-off / turn-on control signal. The first control turn-off / turn-on control signal is transmitted to the first control terminal, and the second turn-off / turn-on control signal is transmitted to the second control terminal.
5. The AC solid-state power controller according to claim 1, wherein, the zero-crossing judgment unit includes a zero-crossing judgment sub-unit and a logic transformation sub-unit, where: the zero-crossing judgment sub-unit includes a first sampling input terminal, a second sampling input terminal, a first operational amplifier output terminal, and a second operational amplifier output terminal. The first sampling input terminal is electrically connected to the first sampling terminal, and the second sampling input terminal is electrically connected to the second sampling terminal; the logic transformation sub-unit includes a first operational amplifier input terminal, a second operational amplifier input terminal, a first signal receiving port, a second signal receiving port, a first signal feedback port, and a second signal feedback port. The first operational amplifier input terminal is electrically connected to the first operational amplifier output terminal, the second operational amplifier input terminal is electrically connected to the second operational amplifier output terminal, the first signal receiving port is electrically connected to the first signal receiving end, the second signal receiving port is electrically connected to the second signal receiving end, the first signal feedback port is electrically connected to the first signal feedback terminal, and the second signal feedback port is electrically connected to the second signal feedback terminal.
6. The AC solid-state power controller according to claim 5, wherein, the zero-crossing judgment sub-unit includes a first operational amplifier comparison chip. The first operational amplifier comparison chip performs zero-crossing comparison and amplification on the collected voltage signal and then transmits it to the logic transformation sub-unit.
7. The AC solid-state power controller according to claim 5, wherein, the logic transformation sub-unit includes a plurality of NAND gate logic circuits, which convert the amplified electrical signal into a logic signal and feed it back to the turn-off execution unit.
8. The AC solid-state power controller according to claim 1, wherein, the overcurrent judgment unit includes a second operational amplifier comparison chip for judging overcurrent and / or short circuit in the AC circuit where it is located. When overcurrent and / or short circuit occurs, the overcurrent turn-off unit outputs a high-level turn-off signal to the turn-off execution unit at the third signal feedback terminal, thereby realizing overcurrent and / or short circuit protection.
9. The AC solid-state power controller according to claim 8, wherein, the overcurrent judgment unit further includes an optocoupler. By applying the voltage threshold set in the circuit of the optocoupler and the second operational amplifier comparison chip, the overcurrent turn-off unit keeps outputting a high-level turn-off signal to the turn-off execution unit after the overcurrent and / or short circuit situation is eliminated, thereby avoiding secondary overcurrent and / or short circuit.
10. The AC solid-state power controller according to claim 1, wherein, The power supply unit includes a set of optocouplers, and by applying the optocouplers, an isolated DC power supply is output.