CN212627842U

CN212627842U - Hybrid switch control circuit

Info

Publication number: CN212627842U
Application number: CN202021330842.0U
Authority: CN
Inventors: 邓小军; 袁高普; 陈道杰
Original assignee: Shanghai Jingsi Intelligent Technology Co ltd
Current assignee: Shanghai Jingsi Intelligent Technology Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2021-02-26
Anticipated expiration: 2030-07-08

Abstract

The embodiment of the utility model discloses hybrid switch control circuit, it is provided with MCU, solid state switch drive module, mechanical switch drive module and input/output voltage detection module, comes the optimal control chronogenesis through using MCU to drive a plurality of solid state switches of core and mechanical switch, can guarantee that relevant switch switches on in good time or turn-offs, is favorable to improving hybrid switch product control accuracy.

Description

Hybrid switch control circuit

Technical Field

The embodiment of the utility model provides a relate to solid-state machinery hybrid switch, concretely relates to hybrid switch control circuit.

Background

In the field of power electronics, mechanical switches, such as relays, contactors, circuit breakers, etc., are generally used to control the on/off of an electrical appliance, and generally, a mechanical switch is required to be disposed between each pair of input terminals and each pair of output terminals. For example, the single-phase switch shown in fig. 11a is provided with switches K1 and Kn at an input end (Vin) and an output end (Vout), respectively, and the three-phase switch shown in fig. 11b is provided with switches Ka, Kb and Kc between the input end (Va _ in, Vb _ in, Vc _ in) and the output end ((Va, Vb, Vc)), respectively, and these mechanical switches are subjected to the change of voltage and current during the on and off processes, so that an arc is inevitably generated, an arc extinguishing device must be added, and the aspects of the service life, reliability, cost, volume, mechanical design difficulty and the like are inevitably affected.

For this reason, hybrid switch products using solid state switches in combination with mechanical switches are on the market. As shown in fig. 11c, the single-phase hybrid switch has two single-pole switches A, B with solid-state switches Kss between the ac input terminal A, B and the output terminals a _ out and B _ out, respectively, thereby forming a complete control circuit, which can be controlled to turn on/off according to a preset strategy of an external control command control. Similarly, a three-phase hybrid switch would also have a solid-state switch in combination with a mechanical switch between each pair of ac input and output terminals. These hybrid switches combine the advantages of solid state switches and mechanical switches, respectively, to facilitate arc elimination.

In the typical hybrid switch, each of the mechanical switch and the solid-state switch simply controls on and off, and the control accuracy is low, and the performance is not ideal in terms of intellectualization and multi-functionalization, and therefore, improvement is necessary.

SUMMERY OF THE UTILITY MODEL

In view of this, to the defects existing in the prior art, the present invention provides a hybrid switch control circuit to improve the control precision of the product.

For solving above technical problem, the utility model provides a hybrid switch control circuit, this hybrid switch includes a plurality of solid state switches and mechanical switch, hybrid switch control circuit is provided with the MCU of accessible auxiliary power supply and the solid state switch drive module who is connected with MCU respectively, mechanical switch drive module and input/output voltage detection module, wherein input/output voltage detection module is used for detecting mechanical switch both ends voltage, MCU is used for controlling solid state switch drive signal according to predetermineeing tactics control solid state switch drive module output solid state switch drive signal and controls solid state switch time delay and switch on or turn-off, and control mechanical switch drive module output mechanical switch drive signal comes corresponding control mechanical switch and directly switches on/off, perhaps switch on or turn-off when mechanical switch both ends voltage accords with the settlement condition.

Specifically, the hybrid switch is a single-phase switch, wherein: a solid switch is connected between the input port and the output port of the live wire in series, and a main isolation mechanical switch is connected between the input port and the output port of the zero wire in series.

Specifically, the hybrid switch is a three-phase three-wire switch, wherein: solid switches are respectively connected in series between the input port and the output port of the two pairs of phase lines, and a main isolating mechanical switch is connected in series between the input port and the output port of the one pair of phase lines.

Specifically, the hybrid switch is a three-phase four-wire switch, wherein: solid-state switches are respectively connected in series between the three pairs of phase line input ports and the three pairs of phase line output ports, and a main isolation mechanical switch is connected in series between the pair of neutral line input ports and the pair of neutral line output ports.

Specifically, the solid state switch is configured with a load bearing mechanical switch, wherein the solid state switch is in series with the load bearing mechanical switch; the mechanical switch driving module comprises a main isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch and the bearing mechanical switch are driven to be respectively and directly switched on when a switching-on command is confirmed, and the main isolation mechanical switch and the bearing mechanical switch are driven to be respectively switched off when voltages at two ends meet set conditions when a switching-off command is carried out.

Specifically, the solid-state switch is configured with a load-bearing mechanical switch, wherein the solid-state switch is connected in parallel with the load-bearing mechanical switch, and the load-bearing mechanical switch and the main isolation mechanical switch form a loop; the mechanical switch driving module comprises a main isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch is driven to be directly switched on when a switching-on command is confirmed, the voltage at two ends of the bearing mechanical switch is switched on when the voltage at two ends meets a set condition, and the bearing mechanical switch is driven to be directly switched off when the switching-off command is confirmed, and the main isolation mechanical switch is switched off when the voltage at two ends meets the set condition.

Specifically, the solid-state switch is configured with a load-bearing mechanical switch and an auxiliary isolation mechanical switch, wherein the solid-state switch is connected in parallel with the load-bearing mechanical switch and then connected in series with the auxiliary isolation mechanical switch; the mechanical switch driving module comprises a main isolation mechanical switch driving module, an auxiliary isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, the auxiliary isolation mechanical switch driving module to output an auxiliary isolation mechanical switch driving signal and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch is driven when a turn-on command is confirmed, the auxiliary isolation mechanical switch is respectively and directly switched on and is switched on when the voltage at two ends of the bearing mechanical switch meets a set condition, the bearing mechanical switch is driven to be directly switched off and is connected with the main isolation mechanical switch when the turn-off command is confirmed, and the auxiliary isolation mechanical switch is correspondingly and respectively switched off when the voltage at two ends meets the set condition.

Specifically, the solid state switch is configured with a load bearing mechanical switch and an auxiliary isolating mechanical switch, wherein: the solid-state switch is connected with the auxiliary isolating mechanical switch in series and then connected with the bearing mechanical switch in parallel; the mechanical switch driving module comprises a main isolation mechanical switch driving module, an auxiliary isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, the auxiliary isolation mechanical switch driving module to output an auxiliary isolation mechanical switch driving signal and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch is driven when a turn-on command is confirmed, the auxiliary isolation mechanical switch is respectively and directly switched on and is switched on when the voltage at two ends of the bearing mechanical switch meets a set condition, the bearing mechanical switch is driven to be directly switched off and is connected with the main isolation mechanical switch when the turn-off command is confirmed, and the auxiliary isolation mechanical switch is correspondingly and respectively switched off when the voltage at two ends meets the set condition.

Specifically, the MCU is configured with an external control command module to receive external commands.

Specifically, the MCU is configured with a PWM soft start module.

Compared with the prior art, the embodiment of the utility model provides a hybrid switch uses MCU to optimize the chronogenesis as a plurality of switches of core drive through the external control order, guarantees through input/output voltage detection simultaneously that relevant switch switches on in good time or turn-offs, and this is favorable to improving the product control precision, also is convenient for realize intellectuality and multifunctionalization.

The hybrid switch product obtained according to the embodiment of the utility model is bipolar and multipolar, can be suitable for single-phase alternating current and three-phase alternating current occasions, is convenient to form a complete control circuit, and completely controls the electric energy between a power supply and a load; meanwhile, through reasonable time sequence control, the advantages and the disadvantages are improved, the conduction loss is reduced by utilizing the mechanical switch, the current conversion is assisted by the solid-state switch, and the mechanical switch is switched on and off in a zero-voltage zero-current state, so that electric arcs can be well avoided.

Drawings

Fig. 1a is a schematic circuit diagram of a hybrid switch according to embodiment 1 of the present invention;

FIG. 1b is a topology of a first solid state switch of FIG. 1 a;

FIG. 1c is a topology of a second solid state switch of FIG. 1 a;

FIG. 1d is a topology of a third solid state switch of FIG. 1 a;

FIG. 1e is a circuit diagram of an embodiment of the hybrid switch of FIG. 1 a;

fig. 1f is a block diagram of a control circuit of a hybrid switch according to embodiment 2 of the present invention;

fig. 1g is a control timing diagram of a hybrid switch according to embodiment 1 of the present invention;

fig. 1h is a signal waveform diagram of a hybrid switch according to embodiment 1 of the present invention;

fig. 2a is a schematic circuit diagram of a hybrid switch according to embodiment 2 of the present invention;

fig. 2b is a block diagram of a control circuit of a hybrid switch according to embodiment 2 of the present invention;

fig. 2c is a control timing diagram of the hybrid switch according to embodiment 2 of the present invention;

fig. 2d is a signal waveform diagram of the hybrid switch according to embodiment 2 of the present invention;

fig. 3a is a schematic circuit diagram of a hybrid switch according to embodiment 3 of the present invention;

fig. 3b is a block diagram of a control circuit of a hybrid switch according to embodiment 3 of the present invention;

fig. 3c is a control timing diagram of the hybrid switch according to embodiment 3 of the present invention;

fig. 3d is a signal waveform diagram of the hybrid switch according to embodiment 3 of the present invention;

fig. 4a is a schematic circuit diagram of a hybrid switch according to embodiment 4 of the present invention;

fig. 4b is a block diagram of a control circuit of a hybrid switch according to embodiment 4 of the present invention;

fig. 4c is a control timing diagram of the hybrid switch according to embodiment 4 of the present invention;

fig. 4d is a signal waveform diagram of the hybrid switch according to embodiment 4 of the present invention;

fig. 5a is a schematic circuit diagram of a hybrid switch according to embodiment 5 of the present invention;

fig. 5b is a block diagram of a control circuit of a hybrid switch according to embodiment 5 of the present invention;

fig. 5c is a timing diagram of the control of the hybrid switch according to embodiment 5 of the present invention;

fig. 5d is a signal waveform diagram of the hybrid switch according to embodiment 5 of the present invention;

fig. 6a is a schematic circuit diagram of a hybrid switch according to embodiment 6 of the present invention;

fig. 6b is a block diagram of a control circuit of a hybrid switch according to embodiment 6 of the present invention;

fig. 6c is a timing control diagram of a hybrid switch according to embodiment 6 of the present invention;

fig. 6d is a signal waveform diagram of the hybrid switch according to embodiment 6 of the present invention;

fig. 7a is a schematic circuit diagram of a hybrid switch according to embodiment 7 of the present invention;

fig. 7b is a block diagram of a control circuit of a hybrid switch according to embodiment 7 of the present invention;

fig. 7c is a timing control diagram of a hybrid switch according to embodiment 7 of the present invention;

fig. 7d is a signal waveform diagram of the hybrid switch according to embodiment 7 of the present invention;

fig. 8a is a schematic circuit diagram of a hybrid switch according to embodiment 8 of the present invention;

fig. 8b is a block diagram of a control circuit of a hybrid switch according to embodiment 8 of the present invention;

fig. 8c is a timing diagram of the control of the hybrid switch according to embodiment 8 of the present invention;

fig. 8d is a signal waveform diagram of the hybrid switch according to embodiment 8 of the present invention;

fig. 9a is a schematic circuit diagram of a hybrid switch according to embodiment 9 of the present invention;

fig. 9b is a block diagram of a control circuit of a hybrid switch according to embodiment 9 of the present invention;

fig. 9c is a timing diagram of the control of the hybrid switch according to embodiment 9 of the present invention;

fig. 9d is a signal waveform diagram of the hybrid switch according to embodiment 9 of the present invention;

fig. 10a is a schematic circuit diagram of a hybrid switch according to embodiment 10 of the present invention;

fig. 10b is a block diagram of a control circuit of a hybrid switch according to embodiment 10 of the present invention;

fig. 10c is a control timing diagram of the hybrid switch according to embodiment 10 of the present invention;

fig. 10d is a signal waveform diagram of the hybrid switch according to embodiment 9 of the present invention;

FIG. 11a is a schematic diagram of a conventional single-phase mechanical switch;

FIG. 11b is a schematic diagram of a conventional three-phase mechanical switch;

fig. 11c is a schematic diagram of a general hybrid switch.

Detailed Description

The following embodiments of the present invention utilize power electronics technology, integrate mechanical switches and solid state switches, and basically eliminate the electric arc during the turn-on and turn-off processes; and through analysis and optimization in the use occasion of the alternating current energy, a group of solid-state switches can be saved after time sequence control is added; after the MCU is added, the integrated hybrid switch can meet the control logic time sequence, and the intelligent communication and multi-functionalization targets can be realized.

The embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in many different ways than those described herein, and those skilled in the art will be able to do so without departing from the spirit of the invention, and therefore the invention is not limited to the specific embodiments disclosed below.

In the following examples 1 to 10, examples 1 to 5 were applied to a single-phase alternating current, examples 6 to 9 were applied to a three-phase three-wire alternating current, and example 10 was applied to a three-phase four-wire alternating current. These embodiments may simplify the circuit topology of a hybrid switch by combining a solid-state switch with mechanical electromagnetism, wherein: in embodiments 2, 3, 8 and 9, a solid-state switch is matched with mechanical electromagnetism, so that semi-isolation can be realized; the embodiments 1, 4, 5, 6, 7 and 10 are added with linked small-sized isolating switches, and can realize full isolation.

The power electronic switches of these embodiments help the mechanical switch to extinguish the arc through the solid state switch, and in certain conditions, the solid state switch can be turned off to reduce losses. In all technical solutions of these embodiments, the whole switch can operate in a soft start PWM mode, which can realize intellectualization after adding an MCU, and has a communication function to interact data with the server side and the user side.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Example 1:

referring to fig. 1a to fig. 1g, the present embodiment is a single-phase switch, which is a typical single-phase structure. As shown in fig. 1a, the elements and symbols of the present embodiment are as follows.

Kss: the solid-state switch can be composed of various power electronic devices such as an IGBT, a MOFET and an SCR, and the topological structure of the solid-state switch can be various, such as a forward and reverse parallel SCR, a reverse series SCR and the like. Furthermore, the topology of Kss may be specifically used according to any combination of the common driving ground structure shown in fig. 1b, the discrete structure shown in fig. 1c, and the thyristor positive-negative structure shown in fig. 1 d;

kp, Kn and ki, namely mechanical switches, specifically relays, contactors, circuit breakers and the like, and the control mode can be fully automatic switching or partially manual switching.

The main functions of the respective elements are as follows.

Kn: electrically isolated, air gap;

kp: load current is carried, and a loop is formed by the load current and Kn;

kss: commutation, which creates a zero voltage condition for the on and off of Kp and basically eliminates electric arcs;

ki: electrically isolated, air gap.

For simplicity, Kn is referred to herein as the primary isolating mechanical switch, Ki is referred to as the secondary isolating mechanical switch, and Kp is referred to as the load-bearing mechanical switch.

In addition, in the case of corresponding to three-phase switches, the naming modes of the main isolating mechanical switch, the auxiliary isolating mechanical switch and the bearing mechanical switch in the single-phase switch are still used, but corresponding to A, B, C three phases, the corresponding Kss, Kp, Ki, Kn and the like are respectively added with subscripts a, b and c for distinguishing.

In this embodiment, Ki is mainly used as an isolating switch, and can be synchronized with Kn, and the working principle and process of the whole switch are as follows.

Isolated state (isolaston): before T0 and after T5, all switches are in an off state in which the input (Vin) is completely isolated from the output (Vout);

the method comprises the following steps that T0-T1, Kn and Ki are conducted firstly, a source and a load (load) are connected at one end only, no current loop exists, and a mechanical switch of the Kn and the Ki is conducted at zero current;

T1-T2: kss starts to be conducted, microsecond time is finished, a source is communicated with a load, load current flows through the Kss, and a main contact of a Kp mechanical switch bears extremely low voltage, namely the conduction voltage drop of the Kss switch is about 2-3V;

T2-T3: kp starts to be conducted at zero voltage, due to the fact that conducting voltage drop of the mechanical switch is extremely low, most of load current flows through Kp, the whole switch enters normal steady state conducting, and Kss can be turned off to reduce semiconductor loss;

T3-T4, before entering the turn-off T3, ensuring that Kss is in a conducting state, starting Kp cut-off by the T3, transferring load current to the solid-state switch Kss, and keeping, wherein the turn-off of Kp belongs to zero-voltage turn-off and no arc is generated;

T4-T5: kss is turned off, load current is cut off, and the load is separated from the source;

after T5: kn and Ki are turned off, the load current is cut off, and the mechanical switch of Kn and Ki is turned off at zero current.

The above embodiment 1 is in a basic structural form. On the basis of this, examples 2 to 10 will be explained below, in which the same portions as those in example 1 are not repeated, and the description thereof can be specifically referred to example 1, if necessary.

Example 2:

referring to fig. 2a to fig. 2d, the single-phase switch is shown, and the working principle and the working process of the whole switch are as follows.

Isolation state: before T0 and after T5, all switches are in an off state, and the input and the output are semi-isolated in the off state;

T0-T1, wherein Kn is firstly conducted, the source and the load are connected at one end only, no current loop exists, and a Kn mechanical switch is conducted with zero current;

T3-T4, before turning on T3, ensuring that Kss is in a conducting state, starting Kp disconnection by T3, transferring load current to a solid-state switch Kss, keeping the Kp disconnection, and turning off Kp belonging to zero-voltage disconnection without generating electric arc;

after T5: kn is turned off, the load current has been cut off, and Kn mechanical switch is turned off with zero current.

Example 3:

referring to fig. 3a to fig. 3d, the single-phase switch is shown, and the working principle and the working process of the whole switch are as follows.

Isolation state: before T0 and after T3, all switches are in an off state, and the input and the output are semi-isolated in the off state;

T0-T1, wherein Kn is firstly conducted, Kss is in a turn-off state, a source and a load are connected at one end only, a current loop does not exist, and a Kn mechanical switch is conducted with zero current;

T1-T2: the Kss starts to be conducted, microsecond time is finished, the source is communicated with the load, and load current flows through the Kss;

T2-T3: t2 begins, Kss turns off the load current, source and load are disconnected, no current;

after T3: kn is turned off, the load current has been cut off, and Kn mechanical switch is turned off with zero current.

Example 4:

referring to fig. 4 a-4 d, the working principle and working process of the whole switch are as follows.

Isolation state: before T0 and after T3, all switches are in an off state, and the input and the output are completely isolated in the off state;

T0-T1, wherein Kn and Kp are firstly conducted, the Kss between a source and a load keeps a turn-off state, a current loop does not exist, and the Kn and Kp mechanical switches are conducted with zero current;

T1-T2: kss starts to be conducted, microsecond time is finished, the source is communicated with the load, and load current flows through Kss and Kp;

T2-T3: kss is turned off, load current is cut off, and the load is disconnected with the source;

after T3: after the current of load is cut off, the source and load are completely isolated after Kn and Kp are cut off, and the mechanical switch of Kn and Kp is cut off with zero current.

Example 5:

referring to fig. 5 a-5 d, the working principle and working process of the whole switch are as follows.

Isolation state: before T0 and after T5, all switches are in an off state, and the input and the output are completely isolated in the off state;

the method comprises the following steps that T0-T1, Kn and Ki are conducted firstly, a source and a load are connected at one end only, a current loop does not exist, and a mechanical switch of the Kn and the Ki is conducted at zero current;

after T5: the Kn and the Ki are turned off, the load current is cut off, and the Kn and the Ki are mechanically switched off at zero current;

this example 5 differs from the protocol of example 1: ki withstands the load current and Ki can also be used as open circuit protection.

Example 6:

referring to fig. 6a to fig. 6d, the three-phase three-wire parallel type disconnecting switch with three phases is shown, and the working principle and the working process of the whole switch are as follows.

Isolation state: before T0, after T5, all switches are in an off state in which the inputs (Va, Vb, Vc) are completely isolated from the outputs (Vao, Vbo, Vco);

kc (corresponding to Kn in examples 1-5, where Kc is called as main isolating mechanical switch), Kia and Kib are firstly conducted, the source and the load are kept in an off state by Ksas and Kssb, no current loop exists, and the Kc, Kia and Kib mechanical switches are conducted with zero current;

T1-T2: ksas and Kssb start to be conducted, microsecond time is finished, the source and the load are communicated, load current flows through Ksas, Kssb and Kc, and the Kpa and Kpb mechanical switch main contacts bear extremely low voltage, namely the Ksas and Kssb switches are conducted and voltage drops are about 2-3V;

T2-T3: kpa and Kpb start to be conducted at zero voltage, because the conduction voltage drop of the mechanical switch is extremely low, most of load current flows through Kpa and Kpb, the whole switch enters normal steady state conduction, Ksa and Kssb can be turned off to reduce semiconductor loss;

before entering the off T3, T3-T4 ensures that Ksas and Kssb are in the on state, T3 starts to cut off Kpa and Kpb, and the load current is transferred to and held by the solid-state switches Ksas and Kssb. The cut-off of Kpa and Kpb belongs to zero voltage cut-off, and no arc is generated;

T4-T5: kssa and Kssb are turned off, load current is cut off, and the load is separated from the source;

after T5: kc. Kia and Kib are turned off, the load current is cut off and isolated, and the Kc, Kia and Kib mechanical switches are turned off at zero current;

example 7:

referring to fig. 7 a-7 d, the three-phase three-wire series switch is shown, and the working principle and working process of the whole switch are as follows.

T0-T1, Kc, Kpa and Kpb are firstly conducted, Ksas and Kssb keep the off state between the source and the load, no current loop exists, and Kc, Kpa and Kpb mechanical switches are conducted with zero current;

T1-T2: ksas and Kssb start to be conducted, microsecond time is finished, the source and the load are communicated, and load current flows through Kc, Kpa and Kpb;

T2-T3: kssa and Kssb are turned off, load current is cut off, and the load is disconnected with the source;

after T3: after the load current is cut off, the mechanical switches Kc, Kpa and Kpb are switched off with zero current, and after the switches Kc, Kpa and Kpb are switched off, the source and the load are completely isolated.

Example 8:

referring to fig. 8 a-8 d, the three-phase three-wire pure solid-state semi-isolated switch is shown, and the working principle and working process of the whole switch are as follows.

Isolation state: before T0 and after T3, all switches are in off state, in this state, input and output semi-isolation T0-T1 Kc is conducted, and the load and source are connected by: kssa and Kssb keep off state, no current loop exists, and Kc mechanical switch is conducted with zero current;

T1-T2: ksas and Kssb start to be conducted, microsecond time is finished, the source and the load are communicated, and load current flows through Kc, Ksas and Kssb;

after T3: when the load current is cut off, the Kc mechanical switch is turned off at zero current, and after the Kc is turned off, the source and the load are semi-isolated.

Example 9:

referring to fig. 9a to 9d, the three-phase three-wire parallel semi-isolated switch is shown, and the working principle and the working process of the whole switch are as follows.

T0-T1, Kc is firstly conducted, Kssa and Kssb keep the off state between the source and the load, no current loop exists, and the Kc mechanical switch is conducted with zero current;

T3-T4, before turning off T3, Ksas and Kssb are ensured to be in a conducting state, T3 starts Kpa and Kpb to be disconnected, load current is transferred to the solid-state switches Ksas and Kssb and is kept, and the Kpa and Kpb are turned off at zero voltage without generating electric arc;

T4-T5: kssa and Kssb are turned off, and the load current is cut off;

after T5: kc is turned off, the source and the load are cut off and isolated, and the Kc mechanical switch is turned off at zero current.

Example 10:

referring to fig. 10a to fig. 10d, the three-phase four-wire hybrid parallel full-isolation switch is shown, and the working principle and the working process of the whole switch are as follows.

Isolation state: before T0 and after T5, all switches are in off state, and the input and the output are completely isolated

K0-T1, K n, Kia, Kib, Kic are firstly conducted, Ksa, Kssb, Kssc keep the off state between the source and the load, no current loop exists, and K n, Kia, Kib, Kic mechanical switches are conducted with zero current;

T1-T2: ksas, Kssb and Kssc are switched on, microsecond time is finished, the source is communicated with the load, the load current flows through the Ksas, Kssb and Kssc, and the Ksa, Kpb and Kpc mechanical switch main contacts bear extremely low voltage, namely Kss switch conduction voltage drop;

T2-T3: kpa, Kpb and Kpc start zero voltage conduction, the conduction voltage drop of the mechanical switch is extremely low, most of load current flows through Kpa and Kpb, the whole switch enters normal steady state conduction, Ksas, Kssb and Kssc can be turned off to reduce semiconductor loss;

T3-T4, before turning off T3, ensuring that Ksas, Kssb and Kssc are in an on state, starting Kp off by T3, transferring load current to the solid-state switches Ksas, Kssb and Kssc, and keeping the Kpa, Kpb and Kpc off due to zero voltage, so that no arc is generated.

T4-T5: kssa, Kssb, Kssc are turned off, and the load current is cut off;

after T5: kc is turned off, the source and the load are cut off and isolated, and the mechanical switches Kn, Kia, Kib and Kic are turned off at zero current.

The embodiments of the present invention are explained in detail above, and the technical solutions in these embodiments have, but are not limited to, the following advantages:

(1) the mechanical switch basically does not generate electric arc under the on and off conditions, so that the safety is improved;

(2) the mechanical switch acts without electric arc, and the service life and the reliability of the mechanical switch are obviously improved;

(3) the mechanical switch acts without electric arc, the design is simple, and the cost is reduced;

(4) the design is simplified, the purpose of realizing functions is achieved, and the use of devices is reduced;

(5) the integration of the power electronic switch and the electromagnetic machine is beneficial to optimizing the volume and the cost;

(6) under the normal on state, the power electronic switch can be switched off, and the power loss of the power electronic switch is completely eliminated;

(7) electromagnetic design can optimize the energy consumption of the control coil under the integrated design;

(8) various control modes can work in PWM (such as Kss single control state) to help load start;

(9) control circuit integration, control logic time sequence, self-diagnosis protection, communication and intelligence;

(10) the intelligent communication function is built in, so that secondary development of a client is facilitated, a parameter time sequence is set, and software is upgraded;

(11) the whole design integrates power electronic technology and electrical appliance technology, and is convenient for realizing the goals of intellectualization, miniaturization, high efficiency, low cost, long service life and safety.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. The utility model provides a hybrid switch control circuit, this hybrid switch includes a plurality of solid state switch and mechanical switch, a serial communication port, hybrid switch control circuit is provided with the MCU of accessible auxiliary power supply and the solid state switch drive module who is connected with MCU respectively, mechanical switch drive module and input/output voltage detection module, wherein input/output voltage detection module is used for detecting mechanical switch both ends voltage, MCU is used for controlling solid state switch drive module output solid state switch drive signal according to predetermineeing the tactics and controls solid state switch time delay and switch on or turn-off, and control mechanical switch drive module output mechanical switch drive signal and come the corresponding mechanical switch of control directly to switch on/off, or switch on or turn-off when mechanical switch both ends voltage accords with the settlement condition.

2. The hybrid switch control circuit of claim 1, wherein the hybrid switch is a single-phase switch, wherein: a solid switch is connected between the input port and the output port of the live wire in series, and a main isolation mechanical switch is connected between the input port and the output port of the zero wire in series.

3. The hybrid switch control circuit of claim 1, wherein the hybrid switch is a three-phase three-wire switch, wherein: solid switches are respectively connected in series between the input port and the output port of the two pairs of phase lines, and a main isolating mechanical switch is connected in series between the input port and the output port of the one pair of phase lines.

4. The hybrid switch control circuit of claim 1, wherein the hybrid switch is a three-phase four-wire switch, wherein: solid-state switches are respectively connected in series between the three pairs of phase line input ports and the three pairs of phase line output ports, and a main isolation mechanical switch is connected in series between the pair of neutral line input ports and the pair of neutral line output ports.

5. A hybrid switch control circuit according to claim 2, 3, or 4 wherein the solid state switch is configured with a load bearing mechanical switch, wherein the solid state switch is in series with the load bearing mechanical switch; the mechanical switch driving module comprises a main isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch and the bearing mechanical switch are driven to be respectively and directly switched on when a switching-on command is confirmed, and the main isolation mechanical switch and the bearing mechanical switch are driven to be respectively switched off when voltages at two ends meet set conditions when a switching-off command is carried out.

6. The hybrid switch control circuit of claim 2, 3, or 4, wherein the solid state switch is configured with a load mechanical switch, wherein the solid state switch is connected in parallel with the load mechanical switch, and wherein the load mechanical switch and the main isolation mechanical switch form a loop; the mechanical switch driving module comprises a main isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch is driven to be directly switched on when a switching-on command is confirmed, the voltage at two ends of the bearing mechanical switch is switched on when the voltage at two ends meets a set condition, and the bearing mechanical switch is driven to be directly switched off when the switching-off command is confirmed, and the main isolation mechanical switch is switched off when the voltage at two ends meets the set condition.

7. A hybrid switch control circuit according to claim 2, 3 or 4 wherein the solid state switch is configured with a load mechanical switch and an auxiliary isolating mechanical switch, wherein the solid state switch is connected in parallel with the load mechanical switch and then in series with the auxiliary isolating mechanical switch; the mechanical switch driving module comprises a main isolation mechanical switch driving module, an auxiliary isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, the auxiliary isolation mechanical switch driving module to output an auxiliary isolation mechanical switch driving signal and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch is driven when a turn-on command is confirmed, the auxiliary isolation mechanical switch is respectively and directly switched on and is switched on when the voltage at two ends of the bearing mechanical switch meets a set condition, the bearing mechanical switch is driven to be directly switched off and is connected with the main isolation mechanical switch when the turn-off command is confirmed, and the auxiliary isolation mechanical switch is correspondingly and respectively switched off when the voltage at two ends meets the set condition.

8. The hybrid switch control circuit of claim 2, 3, or 4, wherein the solid state switch is configured with a load bearing mechanical switch and an auxiliary isolation mechanical switch, wherein: the solid-state switch is connected with the auxiliary isolating mechanical switch in series and then connected with the bearing mechanical switch in parallel; the mechanical switch driving module comprises a main isolation mechanical switch driving module, an auxiliary isolation mechanical switch driving module and a bearing mechanical switch driving module, the MCU is configured to control the main isolation mechanical switch driving module to output a main isolation mechanical switch driving signal, the auxiliary isolation mechanical switch driving module to output an auxiliary isolation mechanical switch driving signal and control the bearing mechanical switch driving module to output a mechanical switch driving signal, so that the main isolation mechanical switch is driven when a turn-on command is confirmed, the auxiliary isolation mechanical switch is respectively and directly switched on and is switched on when the voltage at two ends of the bearing mechanical switch meets a set condition, the bearing mechanical switch is driven to be directly switched off and is connected with the main isolation mechanical switch when the turn-off command is confirmed, and the auxiliary isolation mechanical switch is correspondingly and respectively switched off when the voltage at two ends meets the set condition.

9. The hybrid switch control circuit of claim 1, wherein the MCU is configured with an external control command module to receive external commands.

10. The hybrid switch control circuit of claim 1, wherein the MCU is configured with a PWM soft start module.