CN108736874B - Intelligent remote control MOSFET power electronic alternating current switching device - Google Patents
Intelligent remote control MOSFET power electronic alternating current switching device Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/162—Modifications for eliminating interference voltages or currents in field-effect transistor switches without feedback from the output circuit to the control circuit
- H03K17/163—Soft switching
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K2017/0803—Modifications for protecting switching circuit against overcurrent or overvoltage against radiation hardening
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0009—AC switches, i.e. delivering AC power to a load
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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Abstract
An intelligent remote control MOSFET power electronic alternating current switching device comprises a logic operation and communication remote control circuit unit, a flexible driving circuit unit, an MOSFET power electronic alternating current switching unit and a single-wire auxiliary power supply unit. The logic operation and communication remote control circuit unit is connected with and controls the MOSFET power electronic alternating current switch unit through the flexible driving circuit unit; the single-wire auxiliary power supply unit supplies power to the logic operation and communication remote control circuit unit and the MOSFET power electronic alternating current switch unit respectively; the device utilizes the bidirectional conduction capability of the metal oxide semiconductor field effect transistor to form a low-loss power electronic alternating current switch; the switch peak is eliminated or reduced by adopting a flexible driving circuit, and communication and remote control are realized by adopting WiFi, zigbee or infrared means. The invention has the remote control communication capability; the contact-free arc discharge is avoided, and the work is safe; the on-state voltage is low, the loss is small, and flexible on-off can be realized; the switch peak is low, the electromagnetic compatibility is good, and the overcurrent protection capability is achieved.
Description
Technical Field
The invention relates to an intelligent remote control MOSFET power electronic alternating current switching device, and belongs to the technical field of power electronics.
Background
Compared with a mechanical switch, the power electronic alternating current switch has the advantages of high response speed, no contact, no arcing, higher safety and long service life. The traditional power electronic alternating current switch is formed by antiparallel connection of two thyristors. The thyristor belongs to a semi-controlled device, and once the thyristor is stably conducted, whether the thyristor is conducted or not is determined by an external circuit, and the thyristor is turned off only when the current flowing through the thyristor is smaller than the maintenance current which is close to zero. When the thyristor power electronic alternating current switch controls the inductive load, due to the action of the inductive load, even after the turn-off control signal of the power electronic alternating current switch is generated, the current in the circuit cannot be turned off immediately, but the current which continuously flows through the thyristor is smaller than the maintenance current which approaches zero, the longest delay can reach half a period, and the current of the turn-off circuit cannot be controlled immediately under the working condition.
Various construction schemes of the power electronic alternating current switch are adopted, and various fully-controlled power devices can be constructed in a proper mode. The Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is a fully controlled power device and has bidirectional conduction capability, and when the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is reversely conducted, the conduction resistance is small, so that the synchronous rectification technology utilizes the characteristic. By utilizing these characteristics of Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), low loss MOSFET power electronic ac switches can be constructed.
Compared with the traditional silicon controlled rectifier power electronic alternating current switch, the MOSFET power electronic alternating current switch can switch on and off current in real time, can perform on-off control in a high-frequency mode, and is high in control capability and flexible.
When the line is required to be continuously conducted, the silicon controlled rectifier which is conducted before the zero crossing of the alternating current is also turned off because the alternating current can be at the zero crossing, and in order to maintain the continuous conduction of the silicon controlled rectifier, a driving trigger signal is required to be given again to conduct the silicon controlled rectifier. In contrast, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is a level-driven device, and when it is required to be turned on, a driving signal needs to be applied all the time and the driving power is low as a voltage-driven device. Therefore, the MOSFET power electronic alternating current switch does not need to continuously reapply driving every half alternating current period, and the driving control is more convenient.
When the line controlled by the power electronic ac switch is an inductive load line, and the stray inductance in the line is considered, if the normal driving control is performed, the switching time is too short, so that very high switching peak voltage can be generated, even the power electronic ac switch is burnt or the electromagnetic interference of the line is caused, and certain technical means are needed to avoid the occurrence of the situation. At present, the power electronic soft switching technology is applied in a plurality of ways, and the purposes of the power electronic soft switching technology include reducing switching loss and electromagnetic interference. The power electronic soft switching technology is not enumerated, but the power electronic soft switching technology is directly applied to the power electronic alternating current switch and is suitable for the power electronic alternating current switch, especially when the control frequency of the power electronic alternating current switch is not high. In the soft switching control and design, only stray inductance is needed to be considered, and under the application scene of the power electronic alternating current switch, the load in the circuit can be an inductive load and the inductance component can be quite large, so that the common soft switching technology is inappropriate, and other proper technical schemes are needed.
The power electronic alternating current switch needs an auxiliary power supply to supply power for control, communication and driving. The traditional auxiliary power supply scheme is that a double-wire incoming line, namely a live wire L and a zero wire N are connected into a single-wire auxiliary power supply. However, for many applications such as industrial and commercial and domestic home, the incoming lines and control lines of a large number of ac switches are only single-line-L lines (commonly called fire wires), so that an auxiliary power supply scheme requiring double-line incoming lines may not be suitable. Meanwhile, if the auxiliary power supply also has energy storage and release capability, the reliability of the whole system can be greatly improved.
Many applications represented by smart home require various facilities to have communication and remote control capabilities, and meanwhile, the control flexibility and practicability of the power electronic alternating current switch can be further improved if the power electronic alternating current switch has the remote control capability.
Disclosure of Invention
The invention aims to provide an intelligent remote control MOSFET power electronic alternating current switch device, which is used for realizing a power electronic alternating current switch with instant turn-off capability, overcurrent protection capability, low electromagnetic interference and low conduction loss and a communication remote control function.
The technical scheme of the invention is that the intelligent remote control MOSFET power electronic alternating current switching device comprises a logic operation and communication remote control circuit unit, a flexible driving circuit unit, an MOSFET power electronic alternating current switching unit and a single-wire auxiliary power supply unit. The logic operation and communication remote control circuit unit is connected with and controls the MOSFET power electronic alternating current switch unit through the flexible driving circuit unit; the single-wire auxiliary power supply unit supplies power to the logic operation and communication remote control circuit unit and the MOSFET power electronic alternating current switch unit respectively.
The device utilizes the bidirectional conduction capability of the metal oxide semiconductor field effect transistor to form a low-loss power electronic alternating current switch; the switch peak is eliminated or reduced by adopting a flexible driving circuit, and communication and remote control are realized by adopting WiFi, zigbee or infrared means.
The MOSFET power electronic alternating current switch unit is used for realizing on-off control of an alternating current main circuit and consists of a power electronic alternating current switch main body, an overvoltage protection branch circuit and a current transformer CT; the main body of the power electronic alternating current switch is connected in parallel with the overvoltage protection branch and then connected in series with the current transformer CT.
The power electronic alternating current switch main body is formed by connecting two metal oxide semiconductor field effect transistors with the same type in reverse series, namely a first metal oxide semiconductor field effect transistor Q 1 And a second metal oxide semiconductor field effect transistor Q 2 Is connected together to form S, two metal oxide semiconductor field effect transistors Q 1 And Q 2 Are connected together to form G, two metal oxide semiconductor field effect transistors Q 1 And Q 2 Sharing a common drive terminal, two field effect transistors Q 1 And Q 2 Drain first drain D of (2) 1 A second drain electrode D 2 Is connected with an alternating current main line.
The overvoltage protection branch is formed by a bidirectional transient suppression diode TVS and a resistor R S And capacitor C S Constructing; resistor R S And capacitor C S One end of the parallel-connected diode is connected with a TVS (bidirectional transient suppression diode) in series; resistor R S And capacitor C S The other end of the parallel connection is connected with a second drain electrode D of the power electronic alternating current switch main body 2 The other end of the bidirectional transient suppression diode TVS is connected with the first drain electrode D of the power electronic alternating current switch main body 1 For protecting two metal oxide semiconductor field effect transistors.
The current transformer CT is used for current sampling and electric energy electricity taking, and has two functions.
The logic operation and communication remote control circuit unit is used for receiving an external remote control instruction, carrying out logic operation on the instruction, controlling the MOSFET power electronic alternating current switch unit and realizing on-off control of an alternating current main circuit; after the on-off control is carried out, the on-off control and the outside are communicated to report the actual on-off condition of the MOSFET power electronic alternating current switch, and the communication and the remote control are realized through WiFi, zigbee or infrared means.
The working flow of the logic operation and communication remote control circuit is that after the remote control terminal sends a remote control signal to carry out remote control signal input, the remote control signal is received and decoded, driving control output is carried out, after the logic operation is carried out on the remote control signal and a driving enabling signal, driving output is carried out, and the driving control signal is sent to a driving unit, so that the on-off control of the MOSFET power electronic alternating current switch unit is realized, and further the on-off control of an alternating current main circuit is realized; and simultaneously, the switch state signal is sent to the remote control terminal in real time for real-time communication.
When the remote control signal input receives and decodes the signal into an ON high level, signal self-locking is carried out, the signal and a driving enabling signal carry out ON logic operation, a driving signal is output to a driving unit, ON control G_on is output, off control G_off is interlocked, a MOSFET power electronic alternating current switch unit is turned ON, meanwhile, a switch state signal is sent to a remote control terminal, and the alternating current main circuit is reported to be in an ON state.
When the remote control signal OFF input is received and decoded into an on signal OFF, signal self-locking is carried out, the signal and a drive enable signal carry out turn-OFF logic operation, a drive signal is output to a drive unit, turn-OFF control G_off is output, meanwhile turn-on control G_on is interlocked, and a MOSFET power electronic alternating current switch unit is turned OFF; the time for turning off the high level output of the control G_off is controlled to be equal to half an alternating current period, if the period of the alternating current main circuit is 20ms, the duration time of the control is controlled to be 10ms so as to reduce the power and energy loss of the system, a switch state signal is sent to the remote control terminal, and the alternating current main circuit is reported to be in an off state.
The flexible driving circuit unit comprises a driving unit and a driving enabling circuit unit.
The flexible drive circuit unit reduces the on and off voltage peaks of the metal oxide semiconductor field effect transistors Q1 and Q2 by prolonging the on and off time, and protects the metal oxide semiconductor field effect transistors Q1 and Q2.
The flexible drive circuit unit utilizes the alternating current variation characteristic of alternating current, the instantaneous value of the flexible drive circuit unit can be periodically changed to a smaller value and a zero crossing characteristic, and the flexible turn-off of the metal oxide semiconductor field effect transistor is realized by implementing turn-off when the alternating current passes through the zero point or the alternating current is smaller, so that the electromagnetic compatibility of the system is improved while the peak of turn-off voltage is reduced or even eliminated; the flexible drive circuit unit reduces the peak of on-off voltage and improves the electromagnetic compatibility of the system by increasing the on-off time of the metal oxide semiconductor field effect transistor.
The flexible drive circuit unit simultaneously realizes an overcurrent protection function, and current sampling is obtained through a current transformer CT in the MOSFET power electronic alternating current switch; the drive enabling circuit unit comprises two functions of turn-off drive enabling and overcurrent protection, and the turn-off drive enabling EN_off and the overcurrent protection PR are controlled respectively.
The single-wire auxiliary power supply consists of a power acquisition unit, a charging unit, a direct-current voltage output unit and an energy storage unit; the input end of the charging unit is a power acquisition unit, the output of the charging unit is connected with the direct-current voltage output unit and the energy storage unit, the direct-current voltage output unit is connected with a direct-current load, and proper direct-current voltage is provided for the direct-current load; the charging unit charges the energy storage unit.
The direct current load comprises a direct current power supply required by a logic operation and communication remote control circuit unit and a flexible driving circuit unit; the energy storage unit is composed of a super capacitor or a storage battery, and the super capacitor is preferred.
The electricity collecting unit is divided into a first electricity collecting unit and a second electricity collecting unit; the first electricity collecting unit and the second electricity collecting unit are in complementary working modes and cannot work simultaneously; the first electricity collecting unit is connected with the output of the second electricity collecting unit in parallel.
When the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit works; when the MOSFET power electronic alternating current switch unit is closed and the alternating current main circuit is closed, the second power collecting unit works; the first power acquisition unit is connected in parallel with the MOSFET power electronic alternating current switch unit, namely is connected between a fire wire L and an intersection point M of the primary side of the current transformer CT and an alternating current main line load; when the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit is connected into the whole alternating current main circuit so as to obtain energy, but the magnitude of current flowing through the first power acquisition unit is required to be controlled so as to avoid the situation that the alternating current main circuit load is opened by mistake; the second electricity collection unit is connected with the CT secondary side of the current transformer to obtain energy.
When the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit works; when the MOSFET power electronic alternating current switch unit is closed and the alternating current main circuit is closed, the second power collecting unit works.
The intelligent remote control MOSFET power electronic alternating current switch has the beneficial effects that the intelligent remote control MOSFET power electronic alternating current switch has remote control communication capability; the contact-free arc is not drawn, so that the working is safer; the on-state voltage is low, the loss is small, and flexible on-off can be realized; the switch peak is low, the electromagnetic compatibility is good, and the overcurrent protection capability is achieved. The single-wire auxiliary power supply unit only needs the live wire L, does not need the input of the zero wire N, simplifies the circuit laying and reduces the cost. The invention has the advantages of simple structure, good performance, high reliability and strong practicability. The system has high reliability and low loss, solves the problems of unsafe and short service life and the like caused by arc discharge of the control circuit of the conventional contactor, and solves the problems of high loss and inflexible control of the AC power electronic switch of the silicon controlled rectifier, and the system has an overcurrent protection function, a communication and remote control function and more flexible control and monitoring means of the system. The invention can be applied to various industrial and mining enterprises, intelligent home and other occasions, and has wide market prospect.
Drawings
FIG. 1 is a schematic block diagram of an intelligent remote control MOSFET power electronic AC switch of the present invention;
fig. 2 is a MOSFET power electronic ac switch cell circuit of the intelligent remote control MOSFET power electronic ac switch of the present invention, wherein 1 is a power electronic ac switch body, 2 is an overvoltage protection branch, and 3 is a current transformer;
FIG. 3 is a schematic diagram of a drive unit circuit of a flexible drive circuit unit of an intelligent remote control MOSFET power electronic AC switch according to the present embodiment;
fig. 4 is a circuit of a driving enabling circuit unit of the flexible driving circuit unit of the intelligent remote control MOSFET power electronic alternating current switch according to the present embodiment.
FIG. 5 is a schematic diagram of the connection of the power collection unit of the intelligent remote control MOSFET power electronic alternating current switch single-wire auxiliary power supply unit;
FIG. 6 is a schematic diagram of a second power acquisition unit of the intelligent remote control MOSFET power electronic alternating current switch single-wire auxiliary power supply unit;
FIG. 7 is a block diagram of a single-wire auxiliary power supply unit of the intelligent remote control MOSFET power electronic alternating current switch;
fig. 8 is a block diagram of the logic operation and communication remote control circuit unit of the intelligent remote control MOSFET power electronic ac switch according to this embodiment.
Fig. 9 is a diagram showing the operation of the intelligent remote control MOSFET power electronic ac switch according to the present embodiment, in which the communication remote control circuit unit adopts the infrared control-the mode of the remote control of the delta tv.
Detailed Description
Specific embodiments of the invention are shown in the drawings.
Fig. 1 is a block diagram of the structure of the intelligent remote control MOSFET power electronic ac switch according to the present embodiment, including a logic operation and communication remote control circuit unit, a flexible driving circuit unit, a MOSFET power electronic ac switch unit, and a single-wire auxiliary power supply unit.
The logic operation and communication remote control circuit of the embodiment completes logic control, and communication and remote control are realized by adopting WiFi, zigbee or infrared and other means.
The flexible driving circuit unit of the embodiment realizes flexible driving of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET), reduces the on and off voltage peaks of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET), protects the Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and has better electromagnetic compatibility.
The MOSFET power electronic ac switch unit of this embodiment utilizes the bidirectional conduction capability of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) to form a low-loss power electronic ac switch, and realizes on-off control of an ac main line.
The single-wire auxiliary power supply unit of the embodiment supplies power to the logic operation and communication remote control circuit unit and the flexible driving circuit unit.
Fig. 2 is a MOSFET power electronic ac switch cell circuit of the intelligent remote control MOSFET power electronic ac switch of the present embodiment. The MOSFET power electronic alternating current switch unit circuit realizes on-off control of an alternating current main circuit and comprises a power electronic alternating current switch main body 1, an overvoltage protection branch circuit 2 and a current transformer 3.
The basic principle of a MOSFET power electronic alternating current switch unit is to utilize the characteristics of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) that has bidirectional conduction capability and small on-state loss. When a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is reversely conducted, the on-resistance is extremely low, and the on-state loss is small.
In the embodiment, the power electronic ac switch body 1 of the MOSFET power electronic ac switch unit is formed by connecting two Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1 and Q2 of the same type in reverse series by utilizing the bidirectional conduction capability of the MOSFETs to form a low-loss power electronic ac switch, that is, the sources of the two MOSFETs are connected together to form S, the gates of the two MOSFETs are connected together to form G, the two MOSFETs share the same driving end, and the drains D of the two MOSFETs 1 、D 2 Is connected with an alternating current main line. In the figure, Q1 and Q2 are main Metal Oxide Semiconductor Field Effect Transistors (MOSFETs); the diodes VD1, VD2 are body diodes, i.e. parasitic diodes, which are parasitic in the respective MOSFET tubes.
When a driving voltage is applied across G, S, both Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1 and Q2 are turned on when current flows from D 1 Flow direction D 2 When the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) Q1 is reversely conducted, the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) Q2 is positively conducted; when the current is from D 2 Flow direction D 1 When the metal oxide semiconductor field isThe effect transistor (MOSFET) Q1 is forward-turned on, and the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) Q2 is reverse-turned on; due to the extremely low internal resistance of conduction when the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is turned on in the reverse direction, the body diodes VD1, VD2 are not turned on during steady operation regardless of the current flow direction. When no drive voltage is applied across G, S, both Q1, Q2 are off, and the power electronic ac switch body of the MOSFET power electronic ac switch unit is off, i.e., the MOSFET power electronic ac switch is off. The body diodes VD1, VD2 are turned off during steady operation no matter what operating conditions are in.
The overvoltage protection branch 2 of the MOSFET power electronic ac switch unit of the present embodiment is constituted as follows, resistor R S And capacitor C S After being connected in parallel, the high-voltage power supply is connected with a TVS in series, and the high-voltage power supply and the TVS form an overvoltage protection branch which is connected with drains D of Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1 and Q2 in parallel 1 、D 2 Above, for protecting Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1, Q2. The three overvoltage protection branches are similar to buffer circuits of power switch devices, when the on and off voltage of Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is spiked at D 1 、D 2 When the voltage at two ends is higher than the breakdown voltage of the two-way transient suppression diode TVS, the overvoltage protection branch works, and the working principle of the overvoltage protection branch is similar to that of an absorption circuit.
The overvoltage protection branch circuit formed by the three components is designed according to actual needs, and when the on-off voltage peak of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is not large, the overvoltage protection branch circuit formed by the three components can be not needed to be additionally arranged.
The current transformer 3 of the MOSFET power electronic ac switch unit of this embodiment is used for current sampling and power taking, and has two functions at the same time. The primary side of the current transformer CT can be designed into a single turn or a plurality of turns so as to facilitate sampling and electricity taking, and the turn ratio of the primary side to the secondary side is designed according to actual requirements. While it is known that the primary side of a current transformer CT may be multi-turn in design, other designs associated with current transformers CT are available to practitioners.
Fig. 3 is a driving unit circuit of the flexible driving circuit unit of the intelligent remote control MOSFET power electronic alternating current switch according to the present embodiment.
The flexible driving circuit unit realizes flexible driving of Metal Oxide Semiconductor Field Effect Transistors (MOSFET) Q1 and Q2, reduces the on and off voltage peaks of the Metal Oxide Semiconductor Field Effect Transistors (MOSFET), protects the Metal Oxide Semiconductor Field Effect Transistors (MOSFET) and has better electromagnetic compatibility.
The flexible driving circuit unit comprises a driving unit and a driving enabling circuit unit. When the line controlled by the intelligent remote control MOSFET power electronic ac switch of the embodiment is an inductive load line, and meanwhile, stray inductance in the line is considered, for example, if normal driving control is performed, because u=l×di/dt, too short switching time can generate very high switching spike voltage, even burn out a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or cause electromagnetic interference of too high line, and endanger line equipment. Therefore, the embodiment adopts the flexible driving circuit, reduces the on-off voltage peak of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET), protects the Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and has better electromagnetic compatibility.
The driving unit of the flexible driving circuit unit of this embodiment adopts a scheme of reducing the on and off voltage spikes of Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1, Q2 by prolonging the on and off time, and protecting the Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1, Q2. The common driving circuit shortens the on and off time to reduce the switching loss, and the flexible driving circuit unit of the embodiment reduces the electromagnetic interference by increasing the on and off time.
The driving unit has the technical principle that the driving voltage U is suppressed GS The rise rate and fall rate increase the on and off times of Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), thereby reducing on and off voltage spikes and improving electromagnetic compatibility of the system.
u=l di/dt, u is the on or off voltage spike, L is the stray inductance, i is the current flowing through the two ends of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) D, S, in this embodiment the drain D of the Metal Oxide Semiconductor Field Effect Transistors (MOSFET) Q1, Q2 1 、D 2 T is the on or off time.
The on control g_on and the off control g_off of the driving unit have respective different inputs and are interlocked with each other, and the outputs G, S thereof are respectively connected to both ends G, S of the MOSFET power electronic alternating current switching unit.
Flexible opening: when an on-drive control signal G_on applied to the gate and the source of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) T51 is continuously high-level signal input, and an off-drive control signal G_off applied to the primary side diode of the optocoupler is continuously low-level signal input, T51 is turned on, and the secondary side of the optocoupler U51 is turned off. Power supply V CC The capacitor C51 is charged through the drain and source sides of the resistor R51 and the charging time constant tau on Voltage U across R51C 51, G, S GS Thus slowly rising, thereby extending the on-time t of Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1 and Q2 on . On time t on RC circuit time constant tau formed by resistor R51 and capacitor C51 on The influence can control the on time t by controlling the parameters of the resistor R1 and the capacitor C1 on 。
Flexible shut-off: when the on control signal G_on is a continuous low level signal input and the G_off is a continuous high level signal input, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is turned off, and the primary side and the secondary side of the optocoupler U51 are electrified, so that the secondary side of the optocoupler U51 is conducted, the capacitor C51 discharges the resistor R54, and U GS The voltage thus drops slowly, thereby prolonging the turn-off time t of the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) off . Off time t off RC circuit time constant tau formed by R54 and C51 off The influence can be controlled by controlling the parameters of R54 and C51 to control the turn-off time t off 。
The turn-on driving control G_on is applied to the grid electrode and the source electrode of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) T51 through a resistor R52; the off driving control G_off is applied to the primary side two side tubes of the optocoupler U51 through a resistor R53.
The zener diode D1 is connected in parallel to the two ends of G, S for driving voltage protection, so that the voltage of the two ends of G, S is not too high to protect the Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) Q1 and Q2.
In addition, the driving unit circuit can be controlled by adopting an analog switch to replace T51 or U51.
The parameters of the capacitor C51 and the resistors R51 and R54 are selected to be constrained, and the flexible on-off delay time is required to be controlled according to practical application.
Fig. 4 is a circuit of a driving enabling circuit unit of the flexible driving circuit unit of the intelligent remote control MOSFET power electronic alternating current switch according to the present embodiment.
The flexible driving circuit unit of the present embodiment includes a driving enabling circuit unit and a driving unit. The flexible drive circuit unit simultaneously realizes an overcurrent protection function, and current sampling is obtained through a current transformer CT in the MOSFET power electronic alternating current switch; the drive enabling circuit unit comprises two functions of turn-off drive enabling and overcurrent protection, and the turn-off drive enabling EN_off and the overcurrent protection PR are controlled respectively.
The driving enabling circuit of the embodiment realizes flexible turn-off of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and is divided into alternating current main line current sampling, full-bridge rectification, turn-off driving enabling and overcurrent protection according to functions.
Sampling alternating current main line current: the current transformer CT samples the current of the alternating current main line, and the current ratio of the primary side to the secondary side of the current transformer CT is assumed to be K i The capacitor C11 is connected with the secondary side of the current transformer CT in parallel and is used for high-frequency filtering and eliminating high-frequency interference, and the capacitance value of the capacitor C11 is small. The terminal voltage of C11 is the sampling output U of the AC main line current i 。
Full bridge rectification: after the full bridge rectifier BR2 is connected to C11, U is connected to i Full-bridge rectification is carried out to obtain direct-current voltage U r Due to the full bridgeRectifying output to U r 。
U r ＝|U i |-2U d ，
U in d For the forward voltage drop of a single diode in the rectifier bridge BR2, the diode of the rectifier bridge BR2 can be a common diode or a silicon carbide Schottky diode, and the diode is designed according to actual working requirements.
Off drive enable: resistors R14 and R15 form a series voltage divider pair U r The output of the voltage divider is connected with the resistors R10 and R12 to be connected with the comparator. When U is r Less than the reference voltage U ref And when the alternating current main line current is judged to be smaller, the turn-off enable output EN_off is output at a high level, a signal is sent out at the moment, and the MOSFET power electronic alternating current switch is allowed to be turned off. In addition, reference voltage U ref Is a smaller value and is designed according to practical application.
R10 and R11 and the operational amplifier U2A form a comparator, wherein the resistance value of R11 is designed to be far greater than R10, for example 1000 times the value of R10, in order to form a comparator. Due to U r ＝|U i |-2U d Therefore, the reference voltage U ref It is not desirable to design the current value to be too large.
Overcurrent protection: in parallel with the turn-off driving enable, after being connected to the output Uc of the operational amplifier, when Uc is greater than the set reference value U ref1 And when the alternating current main line current is judged to be too large, the enable output PR is a low-level output, a signal is sent out at the moment, and the MOSFET power electronic alternating current switch is forcibly turned off.
The rectifier bridge BR2 is composed of an ultrafast recovery diode; reference voltage U ref And U ref1 All correspond to a certain current of the alternating current main circuit, and are designed according to practical application, U ref And U ref1 The voltage can be obtained by a high-precision mode of adding a reference voltage or a mode of obtaining a proper voltage from +5V/-5V of a direct current power supply by a resistor voltage division mode.
Fig. 5 is a schematic diagram of connection of power collection units of the intelligent remote control MOSFET power electronic alternating current switch single-wire auxiliary power supply unit of the present invention.
The single-wire auxiliary power supply unit of the embodiment supplies power to the logic operation and communication remote control circuit unit, the flexible driving circuit unit and the like. The single-wire auxiliary power supply unit of the embodiment is divided into a power collection unit and a subsequent unit.
The electricity collecting unit is divided into a first electricity collecting unit and a second electricity collecting unit. The first power acquisition unit is connected in parallel with the MOSFET power electronic alternating current switch unit and is connected between a live wire L and a live wire M, wherein L is the live wire L of an alternating current main circuit, M is the intersection point of the primary side of a current transformer CT and an alternating current main circuit load, and the input modes of the live wire L and the zero wire N of different common auxiliary power supplies are input. The second power acquisition unit is connected with the CT secondary side of the current transformer, and is different from the input mode of the traditional power supply.
When the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit works. When the MOSFET power electronic alternating current switch unit is closed and the alternating current main circuit is closed, the second power collecting unit works.
The first power acquisition unit is connected in parallel to the MOSFET power electronic alternating current switch unit, and when the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit is connected into the whole alternating current main circuit to form a loop so as to acquire energy, but the magnitude of current flowing through the first power acquisition unit is required to be controlled so as to avoid the situation that the alternating current main circuit load is wrongly opened. The second electricity collection unit is connected with the secondary side of the current transformer CT, and energy is obtained when the MOSFET power electronic alternating current switch unit is conducted and the alternating current main circuit is conducted.
The follow-up unit comprises a charging unit, a direct-current voltage output unit and an energy storage unit.
The input end of the charging unit is a power acquisition unit, the output of the charging unit is connected with the direct-current voltage output unit and the energy storage unit, the direct-current voltage output unit is connected with a direct-current load, and proper direct-current voltage is provided for the direct-current load. The charging unit can charge the energy storage unit, and when the charging unit is insufficient to maintain the power requirement of the direct-current load under specific operation, the energy storage unit discharges to supply power to the direct-current voltage output unit so as to provide proper direct-current voltage for the direct-current load. The energy storage unit can be composed of a super capacitor or a storage battery, and the super capacitor is preferred.
Fig. 6 is a schematic diagram of a second power collection unit circuit of the intelligent remote control MOSFET power electronic alternating current switch single line auxiliary power supply unit of the present invention.
The second power collecting unit in this embodiment is connected above the secondary side of the current transformer CT, and a capacitor C11 is connected in parallel to the secondary side of the current transformer CT to filter out high-frequency interference, where the secondary side of the current transformer CT is the input of the rectifier bridge BR2, the output of the rectifier bridge BR2 is Uc, and Uc is the output of the second power collecting unit, and then the second power collecting unit is connected to the charging unit.
Fig. 7 is a block diagram of a single-wire auxiliary power supply unit of the intelligent remote control MOSFET power electronic ac switch of the present invention.
The single-wire auxiliary power supply unit in this embodiment supplies power to direct-current loads such as a logic operation and communication remote control circuit unit and a flexible driving circuit unit, wherein an isolation circuit is used for a driving power supply part of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The single-wire auxiliary power supply consists of a power acquisition unit, a charging unit, a direct-current voltage output unit and an energy storage unit.
The input end of the charging unit is a power collecting unit, the output of the charging unit is connected with the direct-current voltage output unit and the energy storage unit, the direct-current voltage output unit is connected with the direct-current load, the direct-current load is provided with proper direct-current voltage, and the charging unit charges the energy storage unit. When the charging unit is insufficient to maintain the power requirement of the direct-current load under the specific operation, the energy storage unit discharges to supply power to the direct-current voltage output unit so as to provide proper direct-current voltage for the direct-current load. The super capacitor/battery serves as the energy storage element of the single-wire auxiliary power supply of the present embodiment, preferably the super capacitor. The dc load in this embodiment includes dc power sources required for a logic operation and communication remote control circuit unit, a flexible driving circuit unit, and the like.
The electricity collecting unit in the embodiment is divided into a first electricity collecting unit and a second electricity collecting unit, and the first electricity collecting unit and the second electricity collecting unit are in complementary working modes and cannot work simultaneously; the first electricity collecting unit is connected with the output of the second electricity collecting unit in parallel.
The first power collecting unit is connected in parallel with the MOSFET power electronic ac switch unit, when the MOSFET power electronic ac switch is turned off, the ac main line is turned off, and at this time, the single-line auxiliary power supply and the ac main line load are connected in series between the live line L and the neutral line N, and the first power collecting unit is powered on. When the MOSFET power electronic alternating current switch is closed, an alternating current main line load is electrified, the alternating current main line flows current, a current transformer CT works, and a second electricity collecting unit works. The first electricity collecting unit and the second electricity collecting unit work alternately and do not work simultaneously. The first power acquisition unit of the embodiment is input into a live wire L and a live wire M, wherein L is the live wire L of an alternating current main circuit, M is the intersection point of a current transformer CT and an alternating current main circuit load, and the input modes of the live wire L and the zero wire N of different auxiliary power supplies are input; the input of the second electricity collecting unit is the secondary side of the current transformer CT, which is different from the traditional mode.
In order to ensure that the load of the alternating current main circuit cannot be conducted by mistake in the working state of the first power acquisition unit, the current flowing through the single-wire auxiliary power supply is extremely small, for example, the design current is smaller than 0.5mA, or the design is carried out according to actual requirements. Since the ac main line load is unknown, the single-line auxiliary power unit of the present embodiment has a variable impedance capability to accommodate the operating conditions of different ac main line loads when it is in its active state. The single-wire auxiliary power supply unit of the embodiment can adopt a constant power input control mode, a constant current input control mode and the like, and is specifically designed according to actual requirements.
The charging unit is connected with the direct-current voltage output unit after the power acquisition unit, the charging unit can charge the energy storage unit, and the direct-current voltage output unit provides stable direct-current voltage output to be supplied to the direct-current load. For example, under special conditions when the ac main circuit is on but the current flowing is too small to provide enough power to the dc load, an energy storage element such as a super capacitor or a storage battery acts as a dc power source and provides a stable dc voltage output via the dc voltage output unit to the dc load.
The charging unit circuit topology of the single-wire auxiliary power supply of this embodiment adopts a flyback switching power supply circuit or other suitable circuit topologies.
The single-wire auxiliary power supply unit of the present embodiment includes: +5V/-5V (V+/V-) for the operational amplifier, +5V for the logic operation and communication remote control circuit, and +15V (Vcc) for the flexible drive circuit unit.
Fig. 8 is a block diagram of the logic operation and communication remote control circuit unit of the intelligent remote control MOSFET power electronic ac switch according to this embodiment.
The working flow of the logic operation and communication remote control circuit of the embodiment is that after a remote control terminal sends a remote control signal to input the remote control signal, the remote control signal is received and decoded, driving control output is carried out, after logic operation is carried out on the remote control signal and a driving enabling signal, driving output is carried out, and the driving control signal is sent to a driving unit, so that the on-off control of a MOSFET power electronic alternating current switch unit is realized, and further the on-off control of an alternating current main circuit is realized; and simultaneously, the switch state signal is sent to the remote control terminal in real time for real-time communication.
The logic operation of the present embodiment includes two types, an on logic operation and an off logic operation.
For a drive enabling circuit of the intelligent remote control MOSFET power electronic alternating current switch, the enable output EN_off is high level output and is used for allowing the MOSFET power electronic alternating current switch to be turned off, and the enable output PR is low level output and is used for forcibly turning off the MOSFET power electronic alternating current switch.
For the flexible drive circuit unit, the on control g_on and the off control g_off have respective different inputs and are interlocked with each other, and the outputs G, S thereof are respectively connected to both ends G, S of the MOSFET power electronic ac switch unit.
Opening logic operation: when the remote control signal is input and received and decoded into ON signal with high level, the signal is self-locked, the signal and the drive enable signal are subjected to ON logic operation, and the drive signal is output to the drive unitAt the same time, the off control G_off is interlocked to the high level outputThe MOSFET power electronic alternating current switch unit is turned on, and meanwhile, a switch state signal is sent to the remote control terminal to report that the alternating current main circuit is in an on state.
Turning off the logic operation: when the remote control signal OFF is received and decoded into an ON signal OFF, the signal is self-locked, the signal and the drive enable signal are subjected to OFF logic operation, and the drive signal is output to a drive unit, such asAnd when the MOSFET power electronic alternating current switch unit is in a high-level output state, the off control G_off is in a high-level output state, and the on control G_on is interlocked to be in a low-level output state. The time for turning off the high level output of the control G_off is controlled to be equal to half an alternating current period, for example, the period of the alternating current main circuit is 20ms, and the duration of the alternating current main circuit is controlled to be 10ms, so that the power and energy consumption of the system are reduced. Meanwhile, a switch state signal is sent to the remote control terminal, and the AC main circuit is reported to be in an off state.
The specific circuit can adopt a plurality of different implementation schemes, and can be designed by a professional, so that a detailed circuit is not provided.
In addition to the specific logic operation mode, other logic operation modes, such as a negative logic operation mode with the specific logic operation mode, and the like, can be flexibly adopted.
The mode of remote control implementation can adopt WiFi, zigbee or infrared and other means to realize communication and remote control, and the WiFi or infrared mode is preferred.
Fig. 9 is a diagram showing the operation of the intelligent remote control MOSFET power electronic ac switch according to the present embodiment, in which the communication remote control circuit unit adopts the infrared control-the mode of the remote control of the delta tv.
The mode of remote control implementation can adopt WiFi, zigbee or infrared and other means to realize communication and remote control, and the WiFi or infrared mode is preferred. In this embodiment, an infrared-infrared control is taken as an example, and a working diagram of a mode of a remote controller of a Deshi television is given.
The intelligent remote control function of the smart mobile phones can be set in a plurality of remote control modes, which is equivalent to a plurality of remote controllers. In this embodiment, a remote control scheme of an infrared control mode commonly used in commercial applications is selected, and in specific implementation, a desinsection television mode is selected for infrared communication remote control. By utilizing the self intelligent remote control function of the intelligent mobile phone, development time can be saved and the remote control terminal does not need to be developed and produced. Besides the existing communication remote control APP, the proper communication remote control APP can be developed by self.
Besides the proposed implementation form, other remote control and communication modes can be flexibly adopted.
Claims (6)
1. The intelligent remote control MOSFET power electronic alternating current switching device is characterized by comprising a logic operation and communication remote control circuit unit, a flexible driving circuit unit, an MOSFET power electronic alternating current switching unit and a single-wire auxiliary power supply unit; the logic operation and communication remote control circuit unit is connected with and controls the MOSFET power electronic alternating current switch unit through the flexible driving circuit unit; the single-wire auxiliary power supply unit supplies power to the logic operation and communication remote control circuit unit and the MOSFET power electronic alternating current switch unit respectively; the device utilizes the bidirectional conduction capability of the metal oxide semiconductor field effect transistor to form a low-loss power electronic alternating current switch; a flexible driving circuit is adopted to eliminate or reduce the switch peak; communication and remote control are realized by adopting WiFi, zigbee or infrared means;
the MOSFET power electronic alternating current switch unit is used for realizing on-off control of an alternating current main circuit and consists of a power electronic alternating current switch main body, an overvoltage protection branch circuit and a current transformer CT; the power electronic alternating current switch main body is connected in parallel with the overvoltage protection branch and then connected in series with the current transformer CT;
The power electronic alternating current switch main body is formed by connecting two metal oxide semiconductor field effect transistors with the same type in reverse series, namely a first metal oxide semiconductor field effect transistor Q 1 And a second metal oxide semiconductor field effect transistor Q 2 The sources of (a) are connected together to form a common connection point S, two metal oxide semiconductor field effect transistors Q 1 And Q 2 Are connected together to form a common connection point G, two metal oxide semiconductor field effect transistors Q 1 And Q 2 Sharing a common drive terminal, two field effect transistors Q 1 And Q 2 Drain first drain D of (2) 1 A second drain electrode D 2 Is connected with an alternating current main line;
the overvoltage protection branch is formed by a bidirectional transient suppression diode TVS and a resistor R S And capacitor C S Constructing; resistor R S And capacitor C S One end of the parallel-connected diode is connected with a TVS (bidirectional transient suppression diode) in series; resistor R S And capacitor C S The other end of the parallel connection is connected with a second drain electrode D of the power electronic alternating current switch main body 2 The other end of the bidirectional transient suppression diode TVS is connected with the first drain electrode D of the power electronic alternating current switch main body 1 For protecting two metal oxide semiconductor field effect transistors; the overvoltage protection branch circuit is designed according to actual needs, and when the on-off voltage peak of the metal oxide semiconductor field effect transistor MOSFET is not large, the overvoltage protection branch circuit formed by the three is not needed to be additionally arranged;
The current transformer CT is used for current sampling and electric energy electricity taking, and has two functions;
the single-wire auxiliary power supply consists of a power acquisition unit, a charging unit, a direct-current voltage output unit and an energy storage unit; the input end of the charging unit is a power acquisition unit, the output of the charging unit is connected with the direct-current voltage output unit and the energy storage unit, the direct-current voltage output unit is connected with a direct-current load, and proper direct-current voltage is provided for the direct-current load; the charging unit charges the energy storage unit;
the direct current load comprises a direct current power supply required by a logic operation and communication remote control circuit unit and a flexible driving circuit unit; the energy storage unit is composed of a super capacitor or a storage battery, and the super capacitor is preferred.
2. The intelligent remote control MOSFET power electronic alternating current switching device according to claim 1, wherein the logic operation and communication remote control circuit unit is used for receiving an external remote control instruction, performing logic operation on the instruction, controlling the MOSFET power electronic alternating current switching unit and realizing on-off control of an alternating current main line; after the on-off control is carried out, the on-off control and the external communication are carried out to report the actual on-off condition of the MOSFET power electronic alternating current switch, and the communication and the remote control are realized through WiFi, zigbee or infrared means;
The logic operation and communication remote control circuit unit comprises a remote control signal receiving and decoding module, a driving control output module, a driving signal output module and a switch state signal output module; the remote control signal is input to the input end of the remote control signal receiving and decoding module; the output end of the remote control signal receiving and decoding module is connected with the input end of the driving signal output module; the output of the driving signal output module is connected with the input end of the driving signal output module through logic operation; the output of the driving signal output module is respectively connected with the switch state signal output module and the driving unit; the switch state signal output module outputs the switch state signal to the remote control terminal;
when the remote control signal input receives and decodes the signal into an ON high level, signal self-locking is carried out, the signal and a driving enabling signal carry out ON logic operation, a driving signal is output to a driving unit, ON control G_on is output, off control G_off is interlocked, a MOSFET power electronic alternating current switch unit is turned ON, meanwhile, a switch state signal is sent to a remote control terminal, and an alternating current main circuit is reported to be in an ON state;
when the remote control signal OFF input is received and decoded into an on signal OFF, signal self-locking is carried out, the signal and a drive enable signal carry out turn-OFF logic operation, a drive signal is output to a drive unit, turn-OFF control G_off is output, meanwhile turn-on control G_on is interlocked, and a MOSFET power electronic alternating current switch unit is turned OFF; the time for turning off the high level output of the control G_off is controlled to be equal to half an alternating current period, the period of the alternating current main circuit is 20ms, the duration time of the alternating current main circuit is controlled to be 10ms, so that the power and energy loss of the system are reduced, a switch state signal is sent to a remote control terminal, and the alternating current main circuit is reported to be in an off state.
3. The intelligent remote control MOSFET power electronic ac switching device of claim 1, wherein said flexible drive circuit unit comprises a drive unit and a drive enable circuit unit;
the flexible drive circuit unit reduces the on and off voltage peaks of the metal oxide semiconductor field effect transistors Q1 and Q2 by prolonging the on and off time, and protects the metal oxide semiconductor field effect transistors Q1 and Q2;
the flexible drive circuit unit utilizes the alternating current variation characteristic of alternating current, the instantaneous value of the flexible drive circuit unit can be periodically changed to a smaller value and a zero crossing characteristic, and the flexible drive circuit unit is turned off when the alternating current zero crossing point or the alternating current is smaller to realize the soft turn-off of the metal oxide semiconductor field effect transistor, so that the electromagnetic compatibility of the system is improved while the peak of turn-off voltage is reduced or even eliminated; the flexible drive circuit unit reduces the peak of on-off voltage and improves the electromagnetic compatibility of the system by increasing the on-off time of the metal oxide semiconductor field effect transistor.
4. The intelligent remote control MOSFET power electronic ac switching device of claim 1 wherein said power harvesting units are divided into a first power harvesting unit and a second power harvesting unit; the first electricity collecting unit and the second electricity collecting unit are in complementary working modes and cannot work simultaneously; the first electricity collecting unit is connected with the output of the second electricity collecting unit in parallel;
When the MOSFET power electronic alternating current switch unit is disconnected, the first power acquisition unit works; when the MOSFET power electronic alternating current switch unit is closed, the second power acquisition unit works; the first power acquisition unit is connected in parallel with the MOSFET power electronic alternating current switch unit, namely is connected between a fire wire L and an intersection point M of the primary side of the current transformer CT and an alternating current main line load; when the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit is connected into the whole alternating current main circuit so as to obtain energy, but the magnitude of current flowing through the first power acquisition unit is required to be controlled so as to avoid the situation that the alternating current main circuit load is opened by mistake; the second power acquisition unit is connected with the secondary side of the current transformer CT, and energy is obtained when the MOSFET power electronic alternating current switch unit is conducted and the alternating current main circuit is conducted;
when the MOSFET power electronic alternating current switch unit is disconnected and the alternating current main circuit is disconnected, the first power acquisition unit works; when the MOSFET power electronic alternating current switch unit is closed and the alternating current main circuit is closed, the second power collecting unit works.
5. The intelligent remote control MOSFET power electronic ac switching apparatus according to claim 2, wherein the logic operation and communication remote control circuit workflow is configured to perform a logic operation with a drive enable signal, perform a drive output and send a drive control signal to the drive unit after receiving and decoding a remote control signal for a remote control signal input by a remote control terminal, and further perform an on/off control of the MOSFET power electronic ac switching unit, thereby performing an on/off control of an ac main line; and simultaneously, the switch state signal is sent to the remote control terminal in real time for real-time communication.
6. An intelligent remote control MOSFET power electronic ac switching device according to claim 3, wherein said on control g_on and off control g_off of said driving unit have respective different input terminals and are interlocked with each other, and the output common connection point G and the common connection point S thereof are respectively connected to both ends of the common connection point G and the common connection point S of the MOSFET power electronic ac switching unit; the flexible drive circuit unit simultaneously realizes an overcurrent protection function, and current sampling is obtained through a current transformer CT in the MOSFET power electronic alternating current switch; the drive enabling circuit unit comprises two functions of turn-off drive enabling and overcurrent protection, and the turn-off drive enabling EN_off and the overcurrent protection PR are controlled respectively.
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| CN112104241B (en) * | 2020-09-16 | 2022-07-12 | 隆鑫通用动力股份有限公司 | Engine generator |
| EP4064563A1 (en) * | 2021-03-24 | 2022-09-28 | Siemens Aktiengesellschaft | Electronic switch |
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