Protection circuit of intelligent panel switch and intelligent panel switch device

Abstract

The utility model provides a protection circuit of an intelligent panel switch and an intelligent panel switch device. The circuit comprises the intelligent panel switch, a load, a control module, a voltage and current detection module and a discharging module. Three control ends of the control module are respectively connected with a control end of the intelligent panel switch, a control end of the voltage and current detection module and a control end of the discharge module; the first end of the discharging module is connected with the first end of the load, the first end of the intelligent panel switch and the first end of the voltage and current detection module. The second end of the discharging module is connected with the second end of the load, the second end of the intelligent panel switch and the second end of the voltage and current detection module. The voltage and current detection module is used for detecting current and voltage phase angles of a load, forming a reactance waveform and sending the reactance waveform to the control module; the control module is used for sending a discharge instruction to the discharge module according to the reactance waveform, and the discharge module is used for emitting an impact pulse opposite to the reactance waveform in phase to offset the reactance waveform and avoid instant large current impact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical appliances, in particular to a protection circuit of a smart panel switch and a smart panel switch device. BACKGROUND

[0002] In the existing electric floor heating product or one-key power-off application scene of high-power liquid crystal screen, when the smart panel or the conventional panel is closed, the capacitive load is cold started. Since the internal resistance of the capacitive load is very small, a very large impact current is generated at the moment of starting the capacitive load. The peak value of the impact current may reach 50-60 times or even 100 times of the rated current.

[0003] The instantaneous large current may cause the contact resistance to heat, the contact to be instantaneously welded, the product to be instantaneously failed, and the panel switch to be unable to close or open. Therefore, how to solve the instantaneous large current is a problem to be solved. CONTENT OF THE INVENTION

[0004] The present application aims at the deficiencies in the prior art, and provides a protection circuit of a smart panel switch and a smart panel switch device to solve the problem that the instantaneous large current at the cold start of the capacitive load in the prior art easily causes the panel switch to be instantaneously failed.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the embodiments of the present application provide a protection circuit of a smart panel switch, which comprises a smart panel switch, a load, a control module, a voltage and current detection module, and a discharge module.

[0007] The first control end, the second control end, and the third control end of the control module are respectively connected with the control end of the smart panel switch, the control end of the voltage and current detection module, and the control end of the discharge module.

[0008] The first end of the discharge module is connected with the first end of the load, the first end of the smart panel switch, and the first end of the voltage and current detection module, and the second end of the discharge module is connected with the second end of the load, the second end of the smart panel switch, and the second end of the voltage and current detection module.

[0009] The voltage and current detection module is used to detect the current and voltage phase angle of the load, form a reactance waveform, and send the reactance waveform to the control module.

[0010] The control module is used to send a discharge instruction to the discharge module according to the reactance waveform, and the discharge module is used to emit an impact pulse opposite in phase to the reactance waveform under the action of the discharge instruction to offset the reactance waveform.

[0011] As an optional implementation, the discharge module includes a driving submodule and a conducting submodule;

[0012] The first end of the drive submodule is connected to the third control end of the control module, and the second end of the drive submodule is connected to the first end of the conduction submodule.

[0013] The second end of the conduction submodule is connected to the first end of the load, and the third end of the conduction submodule is connected to the second end of the load.

[0014] The driving submodule is used to drive the conducting submodule to conduct under the action of the discharge command;

[0015] The conducting submodule is used to discharge when conducting.

[0016] As an optional implementation, the conducting submodule includes a first conducting unit, a second conducting unit, and a first capacitor;

[0017] The first end of the first conducting unit is connected to the first end of the load, the second end of the first conducting unit is connected to the first end of the first capacitor, and the control end of the first conducting unit is connected to the second end of the driving submodule.

[0018] The first end of the second conducting unit is connected to the second end of the load, the second end of the second conducting unit is connected to the second end of the first capacitor, and the control end of the second conducting unit is connected to the second end of the driving submodule.

[0019] The first capacitor is used to discharge when the first conducting unit is turned on and to emit a first impulse pulse, or to discharge when the second conducting unit is turned on and to emit a second impulse pulse, wherein the first impulse pulse and the second impulse pulse are out of phase.

[0020] As an optional implementation, the first conducting unit is a first insulated gate bipolar transistor, the second conducting unit is a second insulated gate bipolar transistor, and the first capacitor is a pre-charge capacitor;

[0021] The emitter of the first insulated gate bipolar transistor is connected to the first terminal of the load, the collector of the first insulated gate bipolar transistor is connected to the first terminal of the precharge capacitor, and the base of the first insulated gate bipolar transistor is connected to the second terminal of the driving submodule.

[0022] The emitter of the second insulated gate bipolar transistor is connected to the second terminal of the load, the collector of the second insulated gate bipolar transistor is connected to the second terminal of the precharge capacitor, and the base of the second insulated gate bipolar transistor is connected to the second terminal of the driving submodule.

[0023] As an optional implementation, the precharge capacitor discharges and emits a first impulse pulse when the first insulated gate bipolar transistor is turned on, or discharges and emits a second impulse pulse when the second insulated gate bipolar transistor is turned on.

[0024] As an optional implementation, if the phase of the reactance waveform is positive, the driving submodule drives the first insulated gate bipolar transistor to conduct under the action of the discharge command; if the phase of the reactance waveform is negative, the driving submodule drives the second insulated gate bipolar transistor to conduct under the action of the discharge command.

[0025] As an optional implementation, if the phase of the reactance waveform is negative, the driving submodule drives the first insulated gate bipolar transistor to conduct under the action of the discharge command; if the phase of the reactance waveform is positive, the driving submodule drives the second insulated gate bipolar transistor to conduct under the action of the discharge command.

[0026] As an optional implementation, the load is an inductive load or a capacitive load, and the reactance waveform is an inductive reactance waveform or a capacitive reactance waveform.

[0027] As an optional implementation, the circuit further includes: a power supply module;

[0028] The power supply terminal of the power module is connected to the input terminal of the control module, and the power module is used to supply power to the control module.

[0029] Secondly, embodiments of this application provide an intelligent panel switch device, including the protection circuit of the intelligent panel switch described in the first aspect.

[0030] The beneficial effects of this application are:

[0031] This application provides a protection circuit and a device for a smart panel switch. The protection circuit includes a discharge module, a smart panel switch, a load, a control module, and a voltage and current detection module. The load and the smart panel switch are connected in series to form the load's starting circuit. The first control terminal of the control module is connected to the control terminal of the smart panel switch to control the switch to close or open. The second control terminal of the control module is connected to the control terminal of the voltage and current detection module to receive the reactance waveform of the load during startup. The third control terminal of the control module is connected to the control terminal of the discharge module and sends a discharge command to the discharge module according to the reactance waveform to control the discharge module to emit an impulse pulse with an opposite phase to the reactance waveform of the load during discharge. This cancels the harmonics generated by the reactance during load startup, making the load's starting circuit a purely resistive circuit with zero voltage crossing. The load's starting current is close to the rated current, avoiding the generation of instantaneous large impulse currents that could cause the smart panel switch to fail, thus improving the safety of the smart panel switch. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the protection circuit for the smart panel switch provided in an embodiment of this application;

[0034] Figure 2 Another schematic diagram of the protection circuit for the smart panel switch provided in the embodiments of this application;

[0035] Figure 3 A schematic diagram of the discharge module of the protection circuit of the smart panel switch provided in the embodiments of this application;

[0036] Figure 4 A schematic diagram of the discharge module's conduction submodule in the protection circuit of the smart panel switch provided in this application embodiment;

[0037] Figure 5 Another schematic diagram of the conduction submodule of the discharge module of the protection circuit of the smart panel switch provided in the embodiment of this application.

[0038] Icons: Discharge Module: 11; Smart Panel Switch: 12; Load: 13; Control Module: 14; Voltage and Current Detection Module: 15; Power Supply Module: 16; Drive Sub-Module: 111; Conduction Sub-Module: 112; First Conduction Unit: 1121; Second Conduction Unit: 1122; First Capacitor: C1; First Insulated Gate Bipolar Transistor: Q1; Second Insulated Gate Bipolar Transistor: Q2; Precharge Capacitor: Cp. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In the electrical appliance field, when a smart panel or conventional panel is closed, the capacitive load generates a very large inrush current during the cold start, which may cause the contact resistance to heat up, the contacts to melt and weld instantly, the product to fail instantly, and the inability to close or open the circuit, thus affecting the service life of the panel switch.

[0044] Based on the above-mentioned problems, this application provides a protection circuit for a smart panel switch. The voltage and current detection module in this circuit detects the current and voltage phase angle of the load, identifies the load's impulse waveform, and feeds it back to the control module. The control module issues a discharge command based on the load's impulse waveform to control the discharge module to emit an impulse pulse that is opposite in phase to the reactance waveform. The impulse pulse cancels out the reactance waveform, making the load's starting circuit a purely resistive circuit with zero voltage crossing. The starting current is close to the rated current, avoiding the generation of instantaneous large impulse current, thereby preventing the smart panel switch from instantaneously failing.

[0045] Figure 1 A schematic diagram of the protection circuit of the smart panel switch provided in the embodiments of this application is shown below. Figure 1 As shown, the protection circuit of the smart panel switch includes: a discharge module 11, a smart panel switch 12, a load 13, a control module 14, and a voltage and current detection module 15.

[0046] Optionally, refer to Figure 1 Load 13 is connected in series with smart panel switch 12 to form the starting circuit of load 13. When load 13 starts, the 230V open-circuit voltage supplies power to load 13. The smart panel switch 12 may include an electromagnet. When the electromagnet is attracted, the smart panel switch 12 closes and load 13 starts. When the electromagnet is disconnected, the smart panel switch 12 opens and load 13 is turned off.

[0047] The first control terminal, the second control terminal, and the third control terminal of the control module 14 are respectively connected to the control terminal of the smart panel switch 12, the control terminal of the voltage and current detection module 15, and the control terminal of the discharge module 11.

[0048] Optionally, continue to refer to Figure 1 The control module 14 includes three control terminals, which are respectively connected to the smart panel switch 12, the voltage and current detection module 15, and the discharge module 11. Specifically, the first control terminal of the control module 14 is connected to the control terminal of the smart panel switch 12 to control the electromagnet to engage or disengage, thereby controlling the smart panel switch 12 to close or open. The second control terminal of the control module 14 is connected to the control terminal of the voltage and current detection module 15, enabling data exchange with the voltage and current detection module 15. The third control terminal of the control module 14 is connected to the control terminal of the discharge module 11 to control the discharge module 11 to discharge.

[0049] The first end of the discharge module 11 is connected to the first end of the load 13, the first end of the smart panel switch 12, and the first end of the voltage and current detection module 15. The second end of the discharge module 11 is connected to the second end of the load 13, the second end of the smart panel switch 12, and the second end of the voltage and current detection module 15.

[0050] Optionally, continue to refer to Figure 1 The first terminal of the discharge module 11 is connected to the first terminal of the load 13, the first terminal of the smart panel switch 12, and the first terminal of the voltage and current detection module 15, respectively. The second terminal of the discharge module 11 is connected to the second terminal of the load 13, the second terminal of the smart panel switch 12, and the second terminal of the voltage and current detection module 15, respectively. The discharge module 11 is connected in parallel with the load 13 and the smart panel switch 12 to form a discharge circuit.

[0051] The voltage and current detection module 15 is used to detect the current and voltage phase angle of the load 13, form a reactance waveform, and send it to the control module 14.

[0052] Optionally, continue to refer to Figure 1 The voltage and current detection module 15 is connected to both ends of the load 13. The voltage and current detection module 15 may include a metering chip. The voltage and current detection module 15 detects the current and voltage phase angle of the load 13 when it starts up through the metering chip. The voltage and current detection module 15 processes the detected current and voltage phase angle to obtain the reactance waveform of the load 13, and sends the reactance waveform of the load 13 to the second control terminal of the control module 14 through the control terminal of the voltage and current detection module 15. The reactance waveform of the load 13 is the impulse waveform of the reactance when the load 13 starts up, i.e., the harmonics generated by the reactance.

[0053] The control module 14 is used to send a discharge command to the discharge module 11 according to the reactance waveform. The discharge module 11 is used to emit an impact pulse that is opposite in phase to the reactance waveform under the action of the discharge command, so as to cancel the reactance waveform.

[0054] Optionally, continue to refer to Figure 1 The control module 14 receives the reactance waveform of the load 13 sent by the control terminal of the voltage and current detection module 15 through the second control terminal. The control module 14 generates a discharge command based on the reactance waveform of the load 13 and sends it to the control terminal of the discharge module 11 through the third control terminal. When the discharge module 11 discharges under the action of the discharge command, it emits an impulse pulse with the phase opposite to the reactance waveform of the load 13. The impulse pulse cancels out the harmonics generated by the reactance when the load 13 starts, making the starting circuit of the load 13 a purely resistive circuit with zero voltage crossing, so that the phase angle of the voltage is zero and the starting current of the load 13 is close to the rated current, avoiding the generation of instantaneous large impulse current.

[0055] In this embodiment, the protection circuit of the smart panel switch includes a discharge module, a smart panel switch, a load, a control module, and a voltage and current detection module. The load and the smart panel switch are connected in series to form the load's starting circuit. The first control terminal of the control module is connected to the control terminal of the smart panel switch, controlling the smart panel switch to close or open. The second control terminal of the control module is connected to the control terminal of the voltage and current detection module, receiving the reactance waveform of the load during startup from the voltage and current detection module. The third control terminal of the control module is connected to the control terminal of the discharge module, sending a discharge command to the discharge module according to the reactance waveform to control the discharge module to emit an impulse pulse with an opposite phase to the reactance waveform of the load during discharge. This cancels the harmonics generated by the reactance during load startup, making the load's starting circuit a purely resistive circuit with zero voltage crossing. The load's starting current is close to the rated current, avoiding the generation of instantaneous large impulse currents that could cause the smart panel switch to fail, thus improving the safety of the smart panel switch.

[0056] Figure 2 Another schematic diagram of the protection circuit for the smart panel switch provided in the embodiments of this application is shown below. Figure 2 As shown, the protection circuit of the smart panel switch also includes a power supply module 16.

[0057] The power supply terminal of the power module 16 is connected to the input terminal of the control module 14, and the power module 16 is used to supply power to the control module 14.

[0058] Optionally, continue to refer to Figure 2 The power module 16 includes a power supply terminal, which is connected to the input terminal of the control module 14 to provide the required electrical energy to the control module 14 and ensure the stable operation of the control module 14.

[0059] In this embodiment, by setting a power supply module in the protection circuit of the smart panel switch and connecting the power supply terminal of the power supply module to the input terminal of the control module, the power supply module supplies power to the control module, which can ensure the stable operation of the control module.

[0060] As an optional implementation, the load 13 is an inductive load or a capacitive load, and the reactance waveform is an inductive reactance waveform or a capacitive reactance waveform.

[0061] Optionally, load 13 can be an inductive load with inductive parameters, such as a motor or transformer; or load 13 can be a capacitive load with capacitive parameters, such as a light-emitting diode (LED) lamp assembly. Accordingly, if load 13 is an inductive load, the reactance waveform of load 13 at startup is an inductive reactance waveform; if load 13 is a capacitive load, the reactance waveform of load 13 at startup is a capacitive reactance waveform. The difference between the inductive and capacitive reactance waveforms mainly lies in the phase relationship between current and voltage. In the inductive reactance waveform of an inductive load, the current lags behind the voltage, while in the capacitive reactance waveform of a capacitive load, the current leads the voltage.

[0062] In this embodiment, the load is either inductive or capacitive. When the load is inductive, the reactance waveform at startup is an inductive reactance waveform, in which the current lags behind the voltage. When the load is capacitive, the reactance waveform at startup is a capacitive reactance waveform, in which the current leads the voltage. This improves the flexibility of the load and the universality and compatibility of the protection circuit of the smart panel switch.

[0063] Figure 3 A schematic diagram of the discharge module of the protection circuit of the smart panel switch provided in this application embodiment is shown below. Figure 3 As shown, the discharge module 11 includes a drive submodule 111 and a conduction submodule 112.

[0064] Optionally, refer to Figure 3 The discharge module 11 includes two sub-modules: a driving sub-module 111 and a conducting sub-module 112. The driving sub-module 111 is used to drive the conducting sub-module 112 to conduct and discharge.

[0065] The first end of the drive submodule 111 is connected to the third control end of the control module 14, and the second end of the drive submodule 111 is connected to the first end of the conduction submodule 112.

[0066] Optionally, continue to refer to Figure 3 The first terminal of the drive submodule 111 is connected to the third control terminal of the control module 14 as the control terminal of the discharge module 11, so as to receive the discharge command sent by the control module 14. The second terminal of the drive submodule 111 is connected to the first terminal of the conduction submodule 112.

[0067] The second end of the conduction submodule 112 is connected to the first end of the load 13, and the third end of the conduction submodule 112 is connected to the second end of the load 13.

[0068] Optionally, continue to refer to Figure 3The second and third terminals of the conducting submodule 112 are respectively connected to the two ends of the load 13 and the two ends of the smart panel switch 12, forming a discharge circuit. Specifically, the second terminal of the conducting submodule 112 is connected to the first terminal of the load 13 and the first terminal of the smart panel switch 12, and the third terminal of the conducting submodule 112 is connected to the second terminal of the load 13 and the second terminal of the smart panel switch 12.

[0069] The drive submodule 111 is used to drive the conduction submodule 112 to conduct under the action of the discharge command.

[0070] Optionally, the first end of the drive submodule 111 receives the discharge command sent by the control module 14 through the third control end, and the drive submodule 111 drives the conduction submodule 112 to conduct through the second end of the drive submodule 111 under the action of the discharge command.

[0071] The conduction submodule 112 is used to discharge when it is turned on.

[0072] Optionally, the conducting submodule 112 discharges under the drive of the driving submodule 111. During discharge, it emits an impulse pulse that is out of phase with the reactance waveform of the load 13 to cancel the harmonics generated by the reactance when the load 13 starts up, so that the starting circuit of the load 13 is a purely resistive circuit with zero voltage crossing, thus avoiding the generation of instantaneous large impulse current.

[0073] In this embodiment, a driving submodule and a conducting submodule are set in the discharge module. The first end of the driving submodule serves as the control end of the discharge module and is connected to the third control end of the control module to receive the discharge command sent by the control module. The second end of the driving submodule is connected to the first end of the conducting submodule. Under the action of the discharge command, the second end of the driving submodule drives the conducting submodule to conduct. The conducting submodule discharges under the drive of the driving submodule. During discharge, it emits an impulse pulse with a phase opposite to the reactance waveform of the load to cancel the harmonics generated by the reactance when the load starts, so that the starting circuit of the load is a purely resistive circuit with zero voltage crossing, avoiding the generation of instantaneous large impulse current.

[0074] Figure 4 This is a schematic diagram of the discharge module's conduction submodule in the protection circuit of the smart panel switch provided in this application embodiment, as shown below. Figure 4 As shown, the conducting submodule 112 includes a first conducting unit 1121, a second conducting unit 1122, and a first capacitor C1.

[0075] Optionally, refer to Figure 4The conducting submodule 112 includes two conducting units and one capacitor, namely a first conducting unit 1121, a second conducting unit 1122, and a first capacitor C1. The first conducting unit 1121, the second conducting unit 1122, and the first capacitor C1 form a forward and reverse discharge circuit, which can discharge in either the forward or reverse direction.

[0076] The first end of the first conducting unit 1121 is connected to the first end of the load 13, the second end of the first conducting unit 1121 is connected to the first end of the first capacitor C1, and the control end of the first conducting unit 1121 is connected to the second end of the driving submodule 111.

[0077] Optionally, continue to refer to Figure 4 The first end of the first conducting unit 1121 serves as the second end of the conducting submodule 112, and is connected to the first end of the load 13 and the first end of the smart panel switch 12. The second end of the first conducting unit 1121 is connected to the first end of the first capacitor C1, and the control end of the first conducting unit 1121 is connected to the second end of the driving submodule 111. The first conducting unit 1121 can be turned on under the drive of the driving submodule 111, causing the first capacitor C1 to discharge.

[0078] The first end of the second conducting unit 1122 is connected to the second end of the load 13, the second end of the second conducting unit 1122 is connected to the second end of the first capacitor C1, and the control end of the second conducting unit 1122 is connected to the second end of the driving submodule 111.

[0079] Optionally, continue to refer to Figure 4 The first terminal of the second conducting unit 1122 serves as the third terminal of the conducting submodule 112, and is connected to the second terminal of the load 13 and the second terminal of the smart panel switch 12. The second terminal of the second conducting unit 1122 is connected to the second terminal of the first capacitor C1, and the control terminal of the second conducting unit 1122 is connected to the second terminal of the driving submodule 111. The second conducting unit 1122 can be turned on under the drive of the driving submodule 111, causing the first capacitor C1 to discharge.

[0080] The first capacitor C1 is used to discharge when the first conducting unit 1121 is turned on and to emit a first impulse pulse, or to discharge when the second conducting unit 1122 is turned on and to emit a second impulse pulse, wherein the first impulse pulse and the second impulse pulse are out of phase.

[0081] Optionally, continue to refer to Figure 4When the first conducting unit 1121 or the second conducting unit 1122 is turned on, the first capacitor C1 discharges, emitting a first impulse waveform or a second impulse waveform that is opposite in phase to the reactance waveform of the load 13. Specifically, when the first conducting unit 1121 is turned on, the first capacitor C1 discharges and emits a first impulse pulse that is opposite in phase to the reactance waveform of the load 13; or, when the second conducting unit 1122 is turned on, the first capacitor C1 discharges and emits a second impulse pulse that is opposite in phase to the reactance waveform of the load 13. It is worth noting that only one of the first conducting unit 1121 and the second conducting unit 1122 in the conducting submodule 112 can be turned on, allowing the conducting submodule 112 to conduct in either the forward or reverse direction, forming a forward discharge circuit or a reverse discharge circuit, and the first impulse pulse and the second impulse pulse are opposite in phase.

[0082] In this embodiment, a first conducting unit, a second conducting unit, and a first capacitor are configured in the conducting submodule to form a forward and reverse discharge circuit. The first end of the first conducting unit serves as the second end of the conducting submodule, connecting to the first end of the load and the first end of the smart panel switch. The second end of the first conducting unit is connected to the first end of the first capacitor, and its control end is connected to the second end of the driving submodule. The first end of the second conducting unit serves as the third end of the conducting submodule, connecting to the second end of the load and the second end of the smart panel switch. The second end of the second conducting unit is connected to the second end of the first capacitor, and its control end is connected to the second end of the driving submodule. The first or second conducting unit can be turned on by the driving submodule, causing the first capacitor to discharge and emitting a first or second impulse pulse with a phase opposite to the reactance waveform of the load. The driving submodule can drive the conducting submodule to only turn on the first conducting unit or only turn on the second conducting unit, causing the conducting submodule to conduct in either the forward or reverse direction, forming a forward or reverse discharge circuit.

[0083] Figure 5 Another schematic diagram of the conduction submodule of the discharge module of the protection circuit of the smart panel switch provided in the embodiments of this application is shown below. Figure 5 As shown, the first conducting unit 1121 is the first insulated gate bipolar transistor Q1, the second conducting unit 1122 is the second insulated gate bipolar transistor Q2, and the first capacitor C1 is the pre-charge capacitor Cp.

[0084] Optionally, refer to Figure 5 The conducting unit can be an Insulated Gate Bipolar Transistor (IGBT), wherein the first conducting unit 1121 is the first IGBT Q1, and the second conducting unit 1122 is the second IGBT Q2. The first capacitor C1 is a pre-charge capacitor Cp, which can absorb instantaneous electrical energy when discharging, reducing the instantaneous current surge.

[0085] The emitter of the first insulated gate bipolar transistor Q1 is connected to the first terminal of the load 13, the collector of the first insulated gate bipolar transistor Q1 is connected to the first terminal of the precharge capacitor Cp, and the base of the first insulated gate bipolar transistor Q1 is connected to the second terminal of the drive submodule 111.

[0086] Optionally, refer to Figure 5 The emitter of the first IGBT Q1 serves as the first terminal of the first conduction unit 1121 and the second terminal of the conduction submodule 112, and is connected to the first terminal of the load 13 and the first terminal of the smart panel switch 12. The collector of the first IGBT Q1 serves as the second terminal of the first conduction unit 1121 and is connected to the first terminal of the pre-charge capacitor Cp. The base of the first IGBT Q1 is connected to the second terminal of the drive submodule 111, and the first IGBT Q1 can be turned on under the drive of the drive submodule 111.

[0087] The emitter of the second insulated gate bipolar transistor Q2 is connected to the second terminal of the load 13, the collector of the second insulated gate bipolar transistor Q2 is connected to the second terminal of the precharge capacitor Cp, and the base of the second insulated gate bipolar transistor Q2 is connected to the second terminal of the drive submodule 111.

[0088] Optionally, continue to refer to Figure 5 The emitter of the second IGBT Q2 serves as the first terminal of the second conduction unit 1122 and the third terminal of the conduction submodule 112, and is connected to the second terminal of the load 13 and the second terminal of the smart panel switch 12. The collector of the second IGBT Q2 serves as the second terminal of the second conduction unit 1122 and is connected to the second terminal of the pre-charge capacitor Cp. The base of the second IGBT Q2 is connected to the second terminal of the drive submodule 111, and the second IGBT Q2 can be turned on under the drive of the drive submodule 111.

[0089] In this embodiment, the first conducting unit is a first insulated-gate bipolar transistor (IGBT), the second conducting unit is a second IGBT, and the first capacitor is a pre-charge capacitor. The first IGBT, the second IGBT, and the pre-charge capacitor form a forward and reverse discharge circuit. The emitter of the first IGBT serves as the first terminal of the first conducting unit and the second terminal of the conducting submodule, connected to the first terminal of the load and the first terminal of the smart panel switch. The collector of the first IGBT serves as the second terminal of the first conducting unit and is connected to the first terminal of the pre-charge capacitor. The base of the first IGBT is connected to the second terminal of the driving submodule. The emitter of the second IGBT serves as the first terminal of the second conducting unit and the third terminal of the conducting submodule, connected to the second terminal of the load and the second terminal of the smart panel switch. The collector of the second IGBT serves as the second terminal of the second conducting unit and is connected to the second terminal of the pre-charge capacitor. The base of the second IGBT is connected to the second terminal of the driving submodule. The first or second insulated gate bipolar transistor is turned on under the drive of the driving submodule, realizing the forward and reverse conduction of the insulated gate bipolar transistor.

[0090] As an optional implementation, the precharge capacitor Cp discharges when the first insulated gate bipolar transistor Q1 is turned on and emits a first impulse pulse, or discharges when the second insulated gate bipolar transistor Q2 is turned on and emits a second impulse pulse.

[0091] Optionally, continue to refer to Figure 5 When the drive submodule 111 drives the first IGBT Q1 to turn on under the action of the discharge command sent by the control module 14, the precharge capacitor Cp discharges and emits a first impulse waveform that is opposite in phase to the reactance waveform of the load 13. Alternatively, when the drive submodule 111 drives the second IGBT Q2 to turn on under the action of the discharge command sent by the control module 14, the precharge capacitor Cp discharges and emits a second impulse waveform that is opposite in phase to the reactance waveform of the load 13.

[0092] In this embodiment, when the driving submodule drives the first insulated-gate bipolar transistor to conduct under the discharge command sent by the control module, the pre-charge capacitor discharges and emits a first impulse waveform that is out of phase with the reactance waveform of the load. Alternatively, when the driving submodule drives the second insulated-gate bipolar transistor to conduct under the discharge command sent by the control module, the pre-charge capacitor discharges and emits a second impulse waveform that is out of phase with the reactance waveform of the load. Through the forward and reverse discharge circuits, the impulse waveform during the pre-charge capacitor discharge and the reactance waveform of the load cancel each other out.

[0093] As an optional implementation, if the phase of the reactance waveform is positive, the driving submodule 111 drives the first insulated gate bipolar transistor Q1 to conduct under the action of the discharge command; if the phase of the reactance waveform is negative, the driving submodule 111 drives the second insulated gate bipolar transistor Q2 to conduct under the action of the discharge command.

[0094] Optionally, continue to refer to Figure 5 Based on the forward and reverse discharge circuits composed of the first IGBT Q1, the second IGBT Q2, and the pre-charge capacitor Cp, the conduction submodule 112 is either forward or reverse conducted. Specifically, if the control module 14 identifies a positive phase voltage in the reactance waveform of the load 13, it sends a reverse conduction discharge command to the drive submodule 111. Under the action of the reverse conduction discharge command, the drive submodule 111 drives the first IGBT Q1 in the conduction submodule 112 to conduct in reverse, and the pre-charge capacitor Cp discharges through the reverse discharge circuit, emitting a first impulse waveform with a phase opposite to the reactance waveform of the load 13; that is, the voltage phase in the first impulse waveform is negative.

[0095] If the control module 14 identifies that the phase of the voltage in the reactance waveform of the load 13 is negative, it sends a forward conduction discharge command to the drive submodule 111. Under the action of the forward conduction discharge command, the drive submodule 111 drives the second IGBT Q2 in the conduction submodule 112 to conduct in the forward direction, and the precharge capacitor Cp discharges through the forward discharge circuit and emits a second impulse waveform with the phase opposite to that of the reactance waveform of the load 13, that is, the phase of the voltage in the second impulse waveform is positive.

[0096] In this embodiment, if the control module identifies that the voltage phase in the load's reactance waveform is positive, it sends a reverse-conduction discharge command to the drive submodule. Under the action of the reverse-conduction discharge command, the drive submodule drives the first insulated-gate bipolar transistor in the conduction submodule to reverse conduct, the pre-charge capacitor discharges through the reverse discharge circuit, and emits a first impulse waveform with a phase opposite to the load's reactance waveform, making the voltage phase in the first impulse waveform negative. If the control module identifies that the voltage phase in the load's reactance waveform is negative, it sends a forward-conduction discharge command to the drive submodule. Under the action of the forward-conduction discharge command, the drive submodule drives the second insulated-gate bipolar transistor in the conduction submodule to forward conduct, the pre-charge capacitor discharges through the forward discharge circuit, and emits a second impulse waveform with a phase opposite to the load's reactance waveform, making the voltage phase in the second impulse waveform positive. Based on the positive or negative phase of the voltage in the load's reactance waveform, the control module sends forward and reverse-conduction discharge commands to the drive submodule, and the drive submodule drives the conduction submodule to discharge in both directions.

[0097] As an optional implementation, if the phase of the reactance waveform is negative, the driving submodule 111 drives the first insulated gate bipolar transistor Q1 to conduct under the action of the discharge command; if the phase of the reactance waveform is positive, the driving submodule 111 drives the second insulated gate bipolar transistor Q2 to conduct under the action of the discharge command.

[0098] Optionally, if the control module 14 identifies that the phase of the voltage in the reactance waveform of the load 13 is negative, it sends a forward conduction discharge command to the drive submodule 111. Under the action of the forward conduction discharge command, the drive submodule 111 drives the first IGBT Q1 in the conduction submodule 112 to conduct in the forward direction, the precharge capacitor Cp discharges through the forward discharge circuit, and emits a first impulse waveform with the phase opposite to that of the reactance waveform of the load 13, that is, the phase of the voltage in the first impulse waveform is positive.

[0099] If the control module 14 identifies that the phase of the voltage in the reactance waveform of the load 13 is positive, it sends a reverse conduction discharge command to the drive submodule 111. Under the action of the reverse conduction discharge command, the drive submodule 111 drives the second IGBT Q2 in the conduction submodule 112 to conduct in reverse, the precharge capacitor Cp discharges through the reverse discharge circuit, and emits a second impulse waveform with the phase opposite to that of the reactance waveform of the load 13, that is, the phase of the voltage in the second impulse waveform is negative.

[0100] In this embodiment, if the control module identifies that the voltage phase in the load's reactance waveform is negative, it sends a forward-conducting discharge command to the drive submodule. Under the action of the forward-conducting discharge command, the drive submodule drives the first insulated-gate bipolar transistor in the conduction submodule to conduct in the forward direction. The pre-charge capacitor discharges through the forward discharge circuit and emits a first impulse waveform with a phase opposite to the load's reactance waveform, making the voltage phase in the first impulse waveform positive. If the control module identifies that the voltage phase in the load's reactance waveform is positive, it sends a reverse-conducting discharge command to the drive submodule. Under the action of the reverse-conducting discharge command, the drive submodule drives the second insulated-gate bipolar transistor in the conduction submodule to conduct in the reverse direction. The pre-charge capacitor discharges through the reverse discharge circuit and emits a second impulse waveform with a phase opposite to the load's reactance waveform, making the voltage phase in the second impulse waveform negative. Based on the positive or negative phase of the voltage in the load's reactance waveform, the control module sends forward and reverse-conducting discharge commands to the drive submodule, and the drive submodule drives the conduction submodule to discharge in both directions.

[0101] This application also provides an intelligent panel switch device, including the protection circuit of the intelligent panel switch described in the foregoing embodiments.

[0102] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A protection circuit for an intelligent faceplate switch, comprising: The utility model relates to a kind of intelligent panel switch, load, control module, voltage current detection module and discharge module; The first control end, the second control end and the third control end of the control module are connected with the control end of the intelligent panel switch, the control end of the voltage current detection module and the control end of the discharge module respectively; The first end of the discharge module is connected with the first end of the load, the first end of the intelligent panel switch and the first end of the voltage current detection module, and the second end of the discharge module is connected with the second end of the load, the second end of the intelligent panel switch and the second end of the voltage current detection module; The voltage current detection module is used to detect the current and voltage phase angle of the load, form a reactance waveform and send it to the control module; The control module is used to send a discharge instruction to the discharge module according to the reactance waveform, and the discharge module is used to emit an impact pulse opposite in phase to the reactance waveform under the action of the discharge instruction to offset the reactance waveform. The discharge module includes a driving submodule and a conduction submodule; 2. The circuit of claim 1, wherein, The first end of the driving submodule is connected with the third control end of the control module, and the second end of the driving submodule is connected with the first end of the conduction submodule; The second end of the conduction submodule is connected with the first end of the load, and the third end of the conduction submodule is connected with the second end of the load; The driving submodule is used to drive the conduction submodule to conduct under the action of the discharge instruction. The conduction submodule is used to discharge when conducting. The conduction submodule includes a first conduction unit, a second conduction unit and a first capacitor; 3. The circuit of claim 2, wherein, The first end of the first conduction unit is connected with the first end of the load, the second end of the first conduction unit is connected with the first end of the first capacitor, and the control end of the first conduction unit is connected with the second end of the driving submodule; The first end of the second conduction unit is connected with the second end of the load, the second end of the second conduction unit is connected with the second end of the first capacitor, and the control end of the second conduction unit is connected with the second end of the driving submodule; The first capacitor is used to discharge and emit a first impact pulse when the first conduction unit conducts, or discharge and emit a second impact pulse when the second conduction unit conducts, wherein the phases of the first impact pulse and the second impact pulse are opposite. The first conduction unit is a first insulated gate bipolar transistor, the second conduction unit is a second insulated gate bipolar transistor, and the first capacitor is a pre-charge capacitor; 4. The circuit of claim 3, wherein, The emitter of the first insulated gate bipolar transistor is connected with the first end of the load, the collector of the first insulated gate bipolar transistor is connected with the first end of the pre-charge capacitor, and the base of the first insulated gate bipolar transistor is connected with the second end of the driving submodule; The emitter of the second insulated gate bipolar transistor is connected with the second end of the load, the collector of the second insulated gate bipolar transistor is connected with the second end of the pre-charge capacitor, and the base of the second insulated gate bipolar transistor is connected with the second end of the driving submodule. ​ 5. The circuit of claim 4, wherein, The pre-charge capacitor discharges and emits a first impact pulse when the first insulated gate bipolar transistor is turned on, or discharges and emits a second impact pulse when the second insulated gate bipolar transistor is turned on.

6. The circuit of claim 5, wherein, If the phase of the reactance waveform is positive, the driving sub-module drives the first insulated gate bipolar transistor to be turned on under the action of the discharge instruction; if the phase of the reactance waveform is negative, the driving sub-module drives the second insulated gate bipolar transistor to be turned on under the action of the discharge instruction.

7. The circuit of claim 5, wherein, If the phase of the reactance waveform is negative, the driving sub-module drives the first insulated gate bipolar transistor to be turned on under the action of the discharge instruction; if the phase of the reactance waveform is positive, the driving sub-module drives the second insulated gate bipolar transistor to be turned on under the action of the discharge instruction.

8. The circuit of claim 1, wherein, The load is an inductive load or a capacitive load, and the reactance waveform is an inductive reactance waveform or a capacitive reactance waveform.

9. The circuit of claim 1, wherein, The circuit further comprises a power supply module; The power supply end of the power supply module is connected with the input end of the control module, and the power supply module is used for supplying power to the control module.

10. An intelligent faceplate switch device, comprising: The protection circuit of the intelligent panel switch according to any one of claims 1-9. The protection circuit of the intelligent panel switch according to any one of claims 1-9.

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