阅读说明：本技术 混合开关控制电路 (Hybrid switch control circuit ) 是由 邓小军 袁高普 陈道杰 于 2020-07-08 设计创作，主要内容包括：本发明实施例公开一种混合开关控制电路,其设置有MCU、固态开关驱动模块、机械开关驱动模块及输入输出电压检测模块,通过以MCU为核心驱动多个开关来优化控制时序,可以保证有关开关适时导通或关断,有利于提高混合开关产品控制精度。(The embodiment of the invention discloses a hybrid switch control circuit which is provided with an MCU (microprogrammed control Unit), a solid-state switch driving module, a mechanical switch driving module and an input/output voltage detection module.)

1. The utility model provides a hybrid switch control circuit, this hybrid switch includes a plurality of solid state switches and mechanical switch, a serial communication port, hybrid switch control circuit is provided with MCU 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 the voltage at mechanical switch both ends, 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 corresponding control mechanical switch and directly switch on/off, perhaps switch on or turn-off when the voltage at mechanical switch both ends 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 can interact data with external devices through the communication module.

10. The hybrid switch control circuit of claim 1, wherein the MCU can soft start the hybrid switch via the PWM soft start module.

Technical Field

The embodiment of the invention relates to a solid-state mechanical hybrid switch, in particular to a 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.

Disclosure of Invention

In view of the above, the present invention provides a hybrid switch control circuit to improve the control accuracy of the product.

In order to solve the above technical problems, the present invention provides a hybrid switch control circuit, the hybrid switch control circuit includes a plurality of solid state switches and a mechanical switch, the hybrid switch control circuit is provided with an MCU, and a solid state switch driving module, a mechanical switch driving module and an input/output voltage detecting module respectively connected to the MCU, wherein the input/output voltage detecting module is configured to detect voltages at two ends of the mechanical switch, the MCU is configured to control the solid state switch driving module to output a solid state switch driving signal according to a preset strategy to control the solid state switch to be turned on or off in a delayed manner, and control the mechanical switch driving module to output a mechanical switch driving signal to correspondingly control the mechanical switch to be turned on/off directly, or to be turned on or off when the voltages at two ends.

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 may interact with external devices through the communication module.

Specifically, the MCU can soft-start the hybrid switch through the PWM soft-start module.

Compared with the prior art, the hybrid switch provided by the embodiment of the invention drives a plurality of switches by taking the MCU as a core, optimizes the time sequence through an external control command, and ensures that the related switches are switched on or off timely through input and output voltage detection, thereby being beneficial to improving the control precision of products and being convenient for realizing intellectualization and multifunctionality.

The hybrid switch product obtained according to the embodiment of the invention is bipolar and multipolar, can be suitable for single-phase alternating current and three-phase alternating current occasions, and is convenient for forming a complete control circuit to completely control 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 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 timing chart of the control of the 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 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 timing diagram of the control of the hybrid switch according to embodiment 2 of the present invention;

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

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

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

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

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

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

fig. 6a is a 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 chart of the control of the 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 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 chart of the control of the 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 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 a hybrid switch according to embodiment 8 of the present invention;

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

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

Fig. 10a is a 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 the hybrid switch according to embodiment 10 of the present invention;

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

FIG. 10d is a signal waveform diagram of a hybrid switch according to embodiment 10 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 integrate the mechanical switch and the solid-state switch by using the power electronic technology, and basically eliminate the electric arc in the on-off process; 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.

Embodiments of the present invention are described in further detail below 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. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

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 embodiments of the present invention will be further described in detail with reference to the accompanying drawings.