Relay device

Abstract

This application provides a relay device, comprising: a main control unit, a switching unit, an absorption control unit, and a drive unit. The main control unit, according to the control strategy of an external circuit, sends a first signal to the drive unit at a first moment to turn the drive unit on, sends a second signal to the absorption control unit at a second moment, and sends a third signal to the drive unit at a third moment to turn the switching unit on. The main control unit is further configured to send a fourth signal to the drive unit at a fourth moment and a fifth signal to the absorption control unit at a fifth moment to turn the switching unit off. The drive unit eliminates the electric arc generated when the switching unit is turned off, and the absorption control unit absorbs the voltage spikes generated when the switching unit is turned off. This application improves the reliability and safety of the relay device.

Description

Technical Field

[0001] This application relates to the field of circuit control technology, and more specifically, to a relay device. Background Technology

[0002] Hybrid relays typically employ a combination of electromagnetic coils and static control circuits. When the relay coil is energized, its normally open contacts close, and its normally closed contacts open, thereby isolating the control circuit from the controlled circuit and enabling the control of high-voltage circuits by low-voltage circuits.

[0003] Existing hybrid relays suffer from problems such as low withstand voltage of the isolation semiconductor device and significant contact erosion, resulting in a shorter-than-expected service life. Summary of the Invention

[0004] The purpose of this application is to provide a relay device to address the shortcomings of the prior art, thereby solving the problem that the relay contacts in the prior art are significantly eroded, resulting in a shorter service life than expected.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] This application provides a relay device, the relay device comprising:

[0007] Main control unit, switching unit, absorption control unit, and drive unit;

[0008] The first end of the absorption control unit is connected to the first end of the main control unit, the second end of the absorption control unit is connected to the first end of the switching unit and the power supply, and the third end of the absorption control unit is connected to the second end of the switching unit.

[0009] The first end of the drive unit is connected to the second end of the main control unit, the second end of the drive unit is connected to the third end of the switch unit, and the third end of the drive unit is connected to the fourth end of the switch unit.

[0010] The second and third ends of the driving unit are also used to connect to external circuits.

[0011] The main control unit is configured to send a first signal to the drive unit at a first moment to turn on the drive unit, and send a second signal to the absorption control unit at a second moment, and send a third signal to the drive unit at a third moment to turn on the switching unit, according to the control strategy of the external circuit.

[0012] The main control unit is also configured to send a fourth signal to the drive unit at a fourth time and a fifth signal to the absorption control unit at a fifth time, so as to turn off the switch unit, eliminate the electric arc generated when the switch unit is turned off by the drive unit, and absorb the spike voltage generated when the switch unit is turned off by the absorption control unit.

[0013] Optionally, the main control unit is also configured to send a sixth signal to the drive unit at a sixth moment.

[0014] Optionally, the absorption control unit includes: a protection unit and an absorption unit;

[0015] The first end of the protection unit is connected to the first end of the main control unit, and the second end of the protection unit is connected to the first end of the absorption unit and the second end of the switching unit.

[0016] The second end of the absorption unit is connected to the first end of the switching unit and the power supply.

[0017] The protection unit is used to shut down under the action of the main control unit, so that the absorption unit absorbs the spike voltage generated when the switching unit is shut down.

[0018] Optionally, the protection unit includes: a first resistor, a second resistor, and a transistor;

[0019] One end of the first resistor is connected to the first end of the main control unit, the other end of the first resistor is connected to the gate of the transistor and one end of the second resistor, the source of the transistor and the other end of the second resistor are grounded, and the drain of the transistor is connected to the first end of the absorption unit and the second end of the switching unit.

[0020] Optionally, the absorption unit includes: a diode;

[0021] One end of the diode is connected to the drain of the transistor and the second end of the switching unit, and the other end of the diode is connected to the first end of the switching unit and the power supply.

[0022] Optionally, the driving unit includes: a series driving unit and a power unit;

[0023] The first end of the series drive unit is connected to the second end of the main control unit, the second end of the series drive unit is connected to the first end of the power unit and the third end of the switch unit, and the second end of the series drive unit is also used to connect to an external circuit.

[0024] The third end of the series drive unit is connected to the second end of the power unit, and the fourth end of the series drive unit is connected to the third end of the power unit and the fourth end of the switch unit.

[0025] Optionally, the series driving unit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a first optocoupler thyristor, and a second optocoupler thyristor;

[0026] One end of the third resistor is connected to the second end of the main control unit, the other end of the third resistor is connected to the first end of the first optocoupler thyristor, the second end of the first optocoupler thyristor is connected to the first end of the second optocoupler thyristor, the third end of the first optocoupler thyristor is connected to one end of the fourth resistor, and the fourth end of the first optocoupler thyristor is connected to the third end of the second optocoupler thyristor.

[0027] The other end of the fourth resistor is connected to one end of the first capacitor and one end of the fifth resistor. The other end of the first capacitor is connected to the other end of the sixth resistor. The other end of the fifth resistor is connected to the first end of the power unit and the third end of the switching unit. The other end of the fifth resistor is also used to connect to an external circuit.

[0028] The second terminal of the second optocoupler thyristor is grounded, the fourth terminal of the second optocoupler thyristor is connected to one end of the sixth resistor and the second terminal of the power unit, and the other end of the sixth resistor is connected to the third terminal of the power unit and the fourth terminal of the switching unit.

[0029] Optionally, the power unit includes: a silicon controlled rectifier (SCR);

[0030] The first end of the thyristor is connected to the other end of the fifth resistor and the third end of the switching unit. The first end of the thyristor is also used to connect to an external circuit.

[0031] The second end of the thyristor is connected to one end of the sixth resistor and the fourth end of the second optocoupler thyristor;

[0032] The third terminal of the thyristor is connected to the other terminal of the sixth resistor, the fourth terminal of the switching unit, and the other terminal of the first capacitor.

[0033] Optionally, the relay device further includes: a seventh resistor;

[0034] One end of the seventh resistor is connected to the first end of the switching unit, and the other end of the seventh resistor is connected to the power supply.

[0035] Optionally, the second end of the driving unit is connected to the first live wire of the external circuit, and the third end of the driving unit is connected to the second live wire of the external circuit.

[0036] The beneficial effects of this application are as follows: By setting a main control unit, a switching unit, an absorption control unit, and a driving unit in the relay device, and by having the main control unit send a first signal to the driving unit at a first moment, a second signal to the absorption control unit at a second moment, and a third signal to the driving unit at a third moment according to the control strategy of the external circuit, the switching unit can be stably turned on. At the same time, the main control unit sends a fourth signal to the driving unit at a fourth moment and a fifth signal to the absorption control unit at a fifth moment according to the control strategy of the external circuit, so that the switching unit can be quickly released. When the switching unit is quickly released, the driving unit can eliminate the arc generated when the switching unit is turned off, and the absorption control unit can absorb the peak voltage generated when the switching unit is turned off. This solves the problem of low withstand voltage of the isolation semiconductor device, reduces the damage to the relay device caused by arc and peak voltage, and thus improves the reliability and safety of the relay device. Attached Figure Description

[0037] 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.

[0038] Figure 1 A schematic diagram of the structure of a relay device provided in an embodiment of this application;

[0039] Figure 2 A timing diagram of a relay device provided in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of a structure of an absorption control unit in a relay device provided in an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the structure of a protection unit in a relay device provided in an embodiment of this application;

[0042] Figure 5 This is a schematic diagram of a structure of an absorption unit in a relay device provided in an embodiment of this application;

[0043] Figure 6 This is a schematic diagram of a drive unit in a relay device provided in an embodiment of this application;

[0044] Figure 7 A schematic diagram of a series drive unit in a relay device provided in an embodiment of this application;

[0045] Figure 8 A schematic diagram of a power unit in the absorption control unit of a relay device provided in an embodiment of this application;

[0046] Figure 9 This is another schematic diagram of the absorption control unit in the relay device provided in the embodiments of this application;

[0047] Figure 10 This is a schematic diagram of another structure of the absorption control unit in the relay device provided in the embodiments of this application;

[0048] Figure 11 A schematic diagram of a relay device provided in an embodiment of this application;

[0049] Figure 12 This is another timing diagram of the relay device provided in the embodiments of this application.

[0050] Icons: Power supply - VCC; First resistor - R1; Second resistor - R2; Transistor - Q1; Diode - D1; Third resistor - R3; Fourth resistor - R4; Fifth resistor - R5; Sixth resistor - R6; First capacitor - C1; First optocoupler thyristor - Q2; Second optocoupler thyristor - Q3; Thyristor - Q4; Seventh resistor - R7; First live wire - L1; Second live wire - L2. Detailed Implementation

[0051] 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. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0052] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. 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.

[0053] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0054] Existing hybrid relays suffer from problems such as low withstand voltage of the isolation semiconductor device and significant contact erosion, resulting in a shorter-than-expected service life.

[0055] Based on the above-mentioned problems, this application proposes a relay device. By setting a main control unit, a switching unit, an absorption control unit, and a driving unit in the relay device, and by sending signals from the main control unit to the absorption control unit and the driving unit, the driving unit can eliminate the electric arc generated when the switching unit is turned off, and the absorption control unit can absorb the voltage spike generated when the switching unit is turned off. This solves the problem of low withstand voltage of the isolation semiconductor device, reduces the damage to the relay device caused by electric arc and voltage spike, and thus improves the reliability and safety of the relay device.

[0056] The relay device provided in this application will be described in detail below with reference to several embodiments.

[0057] Figure 1 This is a schematic diagram of a relay device provided in an embodiment of this application, with reference to... Figure 1 As shown, the relay device includes: a main control unit, a switching unit, an absorption control unit, and a drive unit.

[0058] The first end of the absorption control unit is connected to the first end of the main control unit, the second end of the absorption control unit is connected to the first end of the switching unit and the power supply VCC, and the third end of the absorption control unit is connected to the second end of the switching unit; the first end of the drive unit is connected to the second end of the main control unit, the second end of the drive unit is connected to the third end of the switching unit, and the third end of the drive unit is connected to the fourth end of the switching unit; the second end and the third end of the drive unit are also used to connect to external circuits.

[0059] It is understood that the relay device provided in this application embodiment serves as a switching circuit in an external circuit, and can control the on / off state of the connected external circuit. When the switching unit in the relay device provided in this application embodiment is turned on, the external circuit is turned on; when the switching unit in the relay device provided in this application embodiment is turned off, the external circuit is turned off.

[0060] Optionally, the drive unit may include electronic switching devices and solid-state switching devices to eliminate the electric arc generated when the switching unit in the relay device switches, and at the same time provide a conduction discharge circuit for protecting the relay device.

[0061] Optionally, the absorption control unit may include a switching device and an absorption device for controlling the switching of the switching unit and absorbing the spike voltage generated when the switching unit is turned off.

[0062] The main control unit is used to send a first signal to the drive unit at a first moment to turn on the drive unit, and send a second signal to the absorption control unit at a second moment, and send a third signal to the drive unit at a third moment to turn on the switching unit, according to the control strategy of the external circuit.

[0063] The main control unit is also used to send a fourth signal to the drive unit at the fourth moment and a fifth signal to the absorption control unit at the fifth moment, so as to turn off the switch unit, eliminate the electric arc generated when the switch unit is turned off by the drive unit, and absorb the spike voltage generated when the switch unit is turned off by the absorption control unit.

[0064] Optionally, the main control unit is used to control the timing of the relay device provided in the embodiments of this application. Figure 2 A timing diagram of a relay device provided in an embodiment of this application is shown below. Figure 2 As shown, the main control unit is used to send different signals to the drive unit and the absorption control unit at different times according to the control strategy of the external circuit, so that the switching of the relay device matches the control strategy of the external circuit. The main control unit can be a microcontroller unit (MCU).

[0065] For example, continue to refer to Figure 2 As shown, when the control strategy of the external circuit instructs the relay device to conduct, the main control unit sends a first signal to the drive unit at the first moment T1 to turn on the drive unit. The first signal is a high-level signal, specifically, it can be a non-limited frequency signal.

[0066] For example, continue to refer to Figure 2As shown, the main control unit sends a second signal to the absorption control unit at the second time T2, and sends a third signal to the drive unit at the third time T3, so that the switching unit is turned on. The second signal is a high-level signal, and the third signal is a low-level signal.

[0067] Specifically, the interval between the first time T1 and the second time T2 can be determined by the minimum conduction time of the electronic switching devices and solid-state switching devices in the driving unit, thereby ensuring that the switching unit can conduct effectively and reliably. The interval between the second time T2 and the third time T3 can be determined by whether the switching unit is conducting, and the third time T3 can be the conduction time of the switching unit.

[0068] For example, continue to refer to Figure 2 As shown, when the control strategy of the external circuit instructs the relay device to turn off, for example, when the power supply VCC is de-energized, the main control unit sends a fourth signal to the drive unit at the fourth moment T4.

[0069] The fourth signal is a high-frequency signal, which can increase the turn-on speed of the drive unit when the switch unit is turned off, thereby reducing the arc voltage at both ends of the switch unit when it is turned on, thus extending the service life of the relay device.

[0070] For example, continue to refer to Figure 2 As shown, at the fifth moment T5, the main control unit sends a fifth signal to the absorption control unit to turn off the switching unit, eliminate the arc generated when the switching unit turns off through the drive unit, and absorb the voltage spike generated when the switching unit turns off through the absorption control unit. The fifth signal is a low-level signal.

[0071] In this embodiment, by incorporating a main control unit, a switching unit, an absorption control unit, and a driving unit into the relay device, and by having the main control unit send a first signal to the driving unit at a first moment, a second signal to the absorption control unit at a second moment, and a third signal to the driving unit at a third moment according to the control strategy of the external circuit, the switching unit can be stably turned on. Simultaneously, the main control unit sends a fourth signal to the driving unit at a fourth moment and a fifth signal to the absorption control unit at a fifth moment according to the control strategy of the external circuit, enabling the switching unit to release quickly. Furthermore, during the rapid release of the switching unit, the driving unit eliminates the arc generated when the switching unit is turned off, and the absorption control unit absorbs the voltage spikes generated when the switching unit is turned off. This solves the problem of low withstand voltage of the isolation semiconductor device, reduces damage to the relay device caused by arcs and voltage spikes, and thus improves the reliability and safety of the relay device.

[0072] As one possible implementation, the main control unit is also used to send a sixth signal to the drive unit at the sixth moment.

[0073] For example, continue to refer to Figure 2 As shown, after the switching unit is turned off, the main control unit sends a sixth signal to the drive unit at time T6. This sixth signal is a low-level signal. The interval between time T5 and time T6 can be determined by the release time of the switching unit.

[0074] By sending a sixth signal to the drive unit at the sixth moment after the switching unit stabilizes, the main control unit can shut down the drive unit, ensuring a smooth transition of the relay device's state and avoiding system instability or malfunction caused by the sudden shutdown of the drive unit. This guarantees the stability of the relay device and saves energy consumption.

[0075] As one possible implementation method, Figure 3 This is a schematic diagram of a structure of the absorption control unit in the relay device provided in the embodiments of this application, with reference to... Figure 3 As shown, in Figure 1 Based on this, the absorption control unit includes: a protection unit and an absorption unit.

[0076] The first end of the protection unit is connected to the first end of the main control unit, and the second end of the protection unit is connected to the first end of the absorption unit and the second end of the switching unit; the second end of the absorption unit is connected to the first end of the switching unit and the power supply VCC.

[0077] The protection unit is used to shut down under the action of the main control unit so that the absorption unit absorbs the spike voltage generated when the switching unit is turned off.

[0078] Optionally, the protection unit may include a switching device. When the signal from the main control unit to the absorption control unit is high, the protection unit is turned on. When the signal from the main control unit to the absorption control unit is low, the protection unit is turned off. This allows the absorption unit to absorb the voltage spikes generated when the switching unit is turned off, thereby reducing the impact of voltage spikes on the stability of the relay device and making the relay device more stable and reliable.

[0079] As one possible implementation method, Figure 4 This is a schematic diagram of a protection unit in a relay device provided in an embodiment of this application, with reference to... Figure 4 As shown, in Figure 3 Based on this, the protection unit includes: a first resistor R1, a second resistor R2, and a transistor Q1.

[0080] One end of the first resistor R1 is connected to the first end of the main control unit, the other end of the first resistor R1 is connected to the gate of transistor Q1 and one end of the second resistor R2, the source of transistor Q1 and the other end of the second resistor R2 are grounded, and the drain of transistor Q1 is connected to the first end of the absorption unit and the second end of the switching unit.

[0081] Optionally, the first resistor R1 and the second resistor R2 are used to limit the current and divide the voltage of the signal input to the main control unit and the absorption control unit, thereby protecting the transistor Q1.

[0082] As one possible implementation method, Figure 5 This is a schematic diagram of a structure of an absorption unit in a relay device provided in an embodiment of this application, with reference to... Figure 5 As shown, in Figure 4 Based on this, the absorption unit includes: diode D1.

[0083] One end of diode D1 is connected to the drain of transistor Q1 and the second end of the switching unit, while the other end of diode Q1 is connected to the first end of the switching unit and the power supply VCC.

[0084] Optionally, diode D1 can be a bidirectional breakdown diode (TVS) or a Zener diode, used to increase the rapid discharge of the relay, ensure the consistency of the relay release time, and prevent the relay contacts from being difficult to release due to excessive release time, which could lead to contact arcing and burning.

[0085] For example, taking a bidirectional breakdown diode as an example, when the protection unit is turned off, the voltage in the circuit exceeds the breakdown voltage of diode D1. Diode D1 quickly changes from a high-resistance state to a low-resistance state, allowing current to flow, thereby absorbing the spike voltage generated when the switching unit is turned off, preventing the spike voltage from damaging other circuit components. At the same time, after absorbing the overvoltage, diode D1 can quickly return to a high-resistance state, ready to absorb the next possible overvoltage, making the relay device more stable and reliable.

[0086] As one possible implementation method, Figure 6 This is a schematic diagram of a drive unit in a relay device provided in an embodiment of this application, with reference to... Figure 6 As shown, in Figure 1 Based on this, the drive unit includes: a series drive unit and a power unit.

[0087] The first end of the series drive unit is connected to the second end of the main control unit, the second end of the series drive unit is connected to the first end of the power unit and the third end of the switch unit, and the second end of the series drive unit is also used to connect to an external circuit; the third end of the series drive unit is connected to the second end of the power unit, and the fourth end of the series drive unit is connected to the third end of the power unit and the fourth end of the switch unit.

[0088] Optionally, the fourth terminal of the series drive unit can also be used to connect to an external circuit.

[0089] Optionally, the series drive unit may include electronic switching devices to eliminate the electric arc generated when the switching unit is switched, and the power unit may include solid-state switching devices such as MOSFETs to provide a conduction discharge circuit for the protection relay device.

[0090] As one possible implementation method, Figure 7 This is a schematic diagram of a series drive unit in a relay device provided in an embodiment of this application, with reference to... Figure 7 As shown, in Figure 6 Based on this, the series drive unit includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a first optocoupler thyristor Q2, and a second optocoupler thyristor Q3.

[0091] One end of the third resistor R3 is connected to the second end of the main control unit, and the other end of the third resistor R3 is connected to the first end of the first optocoupler thyristor Q2. The second end of the first optocoupler thyristor Q2 is connected to the first end of the second optocoupler thyristor Q3. The third end of the first optocoupler thyristor Q2 is connected to one end of the fourth resistor R4, and the fourth end of the first optocoupler thyristor Q2 is connected to the third end of the second optocoupler thyristor Q3.

[0092] The other end of the fourth resistor R4 is connected to one end of the first capacitor C1 and one end of the fifth resistor R5. The other end of the first capacitor C1 is connected to the other end of the sixth resistor R6. The other end of the fifth resistor R5 is connected to the first end of the power unit and the third end of the switching unit. The other end of the fifth resistor R5 is also used to connect to an external circuit.

[0093] The second terminal of the second optocoupler thyristor Q3 is grounded. The fourth terminal of the second optocoupler thyristor Q3 is connected to one end of the sixth resistor R6 and the second terminal of the power unit. The other end of the sixth resistor R6 is connected to the third terminal of the power unit and the fourth terminal of the switching unit.

[0094] Optionally, in an opto-coupled triac (OPTO-TRIAC), the first terminal of the first opto-coupled triac Q2 and the first terminal of the second opto-coupled triac Q3 can be the positive input terminal of the opto-coupled triac; the second terminal of the first opto-coupled triac Q2 and the second terminal of the second opto-coupled triac Q3 can be the negative input terminal of the opto-coupled triac; the third terminal of the first opto-coupled triac Q2 and the third terminal of the second opto-coupled triac Q3 can be the anode output terminal of the opto-coupled triac; and the fourth terminal of the first opto-coupled triac Q2 and the fourth terminal of the second opto-coupled triac Q3 can be the cathode output terminal of the opto-coupled triac.

[0095] For example, continue to refer to Figure 2 As shown, when the main control unit controls the switching unit to turn on, after the main control unit sends a high-level signal to the third resistor R3 at the first moment T1, the third resistor R3, the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 turn on in sequence, and drive the power unit to turn on through the fourth resistor R4 and the fifth resistor R5, thereby enabling the switching unit to turn on.

[0096] For example, continue to refer to Figure 2 As shown, when the main control unit controls the switching unit to turn off, the main control unit sends a high-frequency signal to the third resistor R3 at the fourth moment T4, driving the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 to quickly turn on, and making the power unit turn on, so that the switching unit can be turned off by cooperating with the absorption control unit.

[0097] As one possible implementation method, Figure 8 This is a schematic diagram of a power unit in the absorption control unit of the relay device provided in the embodiments of this application, with reference to... Figure 8 As shown, in Figure 7 Based on this, the power unit includes: a thyristor Q4.

[0098] The first end of the thyristor Q4 is connected to the other end of the fifth resistor and the third end of the switching unit. The first end of the thyristor Q4 is also used to connect to an external circuit. The second end of the thyristor Q4 is connected to one end of the sixth resistor and the fourth end of the second optocoupler thyristor Q4. The third end of the thyristor Q4 is connected to the other end of the sixth resistor, the fourth end of the switching unit, and the other end of the first capacitor.

[0099] Optionally, a silicon controlled rectifier (SCR) can have its first end as an anode, its second end as a cathode, and its third end as a control electrode.

[0100] For example, continue to refer to Figure 2As shown, when the main control unit controls the switch unit to turn on, after the main control unit sends a high-level signal to the third resistor R3 at the first moment T1, the third resistor R3, the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 turn on in sequence, and drive the thyristor Q4 to turn on through the fourth resistor R4 and the fifth resistor R5, thereby enabling the switch unit to turn on.

[0101] For example, continue to refer to Figure 2 As shown, when the main control unit controls the switch unit to turn off, the main control unit sends a high-frequency signal to the third resistor R3 at the fourth moment T4, driving the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 to quickly turn on, and making thyristor Q4 turn on. Thus, after thyristor Q4 turns on, it can turn off the switch unit by cooperating with the absorption control unit.

[0102] As one possible implementation method, Figure 9 This is another structural schematic diagram of the absorption control unit in the relay device provided in the embodiments of this application, referred to... Figure 9 As shown, in Figure 1 Based on this, the relay device also includes: the seventh resistor R7.

[0103] One end of the seventh resistor R7 is connected to the first end of the switching unit, and the other end of the seventh resistor R7 is connected to the power supply VCC.

[0104] The seventh resistor provides a stable power supply current to the relay device, thereby protecting it from overcurrent damage and making the relay device more stable, reliable, and safe.

[0105] As one possible implementation method, Figure 10 This is a schematic diagram of another structure of the absorption control unit in the relay device provided in the embodiments of this application, referring to... Figure 10 As shown, in Figure 1 Based on this, the second end of the drive unit is connected to the first live wire L1 of the external circuit, and the third end of the drive unit is connected to the second live wire L2 of the external circuit.

[0106] Optionally, by connecting the second end of the drive unit to the first live wire of the external circuit and the third end of the drive unit to the second live wire of the external circuit, the relay device can be connected in series in the external circuit, thus serving as a switching circuit in the external circuit. The on / off control of the external circuit can be achieved by controlling the activation and deactivation of the relay device.

[0107] The principle of the relay device provided in the embodiments of this application will be explained below. Figure 11 This is a schematic diagram of a relay device provided in an embodiment of this application. Figure 12This is another timing diagram of the relay device provided in the embodiments of this application, referred to... Figure 11 as well as Figure 12 As shown, the switching unit includes switch K1. The coil side of switch K1 is connected to the absorption control unit, and the contact side of switch K1 is connected to the drive unit and external circuit. DRIVE1 is the signal sent by the main control unit to the absorption control unit, DRIVE3 is the signal sent by the main control unit to the drive unit, and VCC is the aforementioned power supply voltage.

[0108] For example, when the main control unit detects that the power supply VCC is turned on and the power supply voltage reaches the preset power supply threshold, the main control unit outputs an unrestricted frequency signal DRIVE2 to the drive unit to drive the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3. When the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 are turned on, the thyristor Q4 is driven to turn on. When the conduction time of thyristor Q4 reaches the minimum conduction time, the main control unit outputs a Drive1 signal to the absorption control unit to drive the switch K1 to turn on, and at the same time turns off the Drive3 drive signal.

[0109] For example, when the main control unit detects that the power supply VCC is de-energized, the main control unit outputs a high-frequency signal Drive3 to the drive unit, driving the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 to quickly turn on. After the first optocoupler thyristor Q2 and the second optocoupler thyristor Q3 are turned on, the drive power unit D1 is turned on. After the power unit D1 is turned on, the main control unit controls the switch K1 to release by turning off the Drive1 signal. At this time, the diode D1 absorbs the peak voltage across the relay when it is released, allowing the switch K1 to release quickly. After the switch K1 is fully released, Drive3 is maintained for a period of time before being turned off.

[0110] 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 relay device, characterized in that, include: Main control unit, switching unit, absorption control unit, and drive unit; The first end of the absorption control unit is connected to the first end of the main control unit, the second end of the absorption control unit is connected to the first end of the switching unit and the power supply, and the third end of the absorption control unit is connected to the second end of the switching unit. The first end of the drive unit is connected to the second end of the main control unit, the second end of the drive unit is connected to the third end of the switch unit, and the third end of the drive unit is connected to the fourth end of the switch unit. The second and third ends of the driving unit are also used to connect to external circuits. The main control unit is used to send a first signal to the drive unit at a first moment to turn on the drive unit, and send a second signal to the absorption control unit at a second moment, and send a third signal to the drive unit at a third moment to turn on the switch unit, according to the control strategy of the external circuit. The main control unit is also configured to send a fourth signal to the drive unit at a fourth time and a fifth signal to the absorption control unit at a fifth time, so as to turn off the switch unit, eliminate the electric arc generated when the switch unit is turned off by the drive unit, and absorb the spike voltage generated when the switch unit is turned off by the absorption control unit.

2. The relay device according to claim 1, characterized in that, The main control unit is also used to send a sixth signal to the drive unit at the sixth moment.

3. The relay device according to claim 1, characterized in that, The absorption control unit includes: a protection unit and an absorption unit; The first end of the protection unit is connected to the first end of the main control unit, and the second end of the protection unit is connected to the first end of the absorption unit and the second end of the switching unit. The second end of the absorption unit is connected to the first end of the switching unit and the power supply. The protection unit is used to shut down under the action of the main control unit, so that the absorption unit absorbs the spike voltage generated when the switching unit is shut down.

4. The relay device according to claim 3, characterized in that, The protection unit includes: a first resistor, a second resistor, and a transistor; One end of the first resistor is connected to the first end of the main control unit, the other end of the first resistor is connected to the gate of the transistor and one end of the second resistor, the source of the transistor and the other end of the second resistor are grounded, and the drain of the transistor is connected to the first end of the absorption unit and the second end of the switching unit.

5. The relay device according to claim 4, characterized in that, The absorption unit includes: a diode; One end of the diode is connected to the drain of the transistor and the second end of the switching unit, and the other end of the diode is connected to the first end of the switching unit and the power supply.

6. The relay device according to claim 1, characterized in that, The drive unit includes: a series drive unit and a power unit; The first end of the series drive unit is connected to the second end of the main control unit, the second end of the series drive unit is connected to the first end of the power unit and the third end of the switch unit, and the second end of the series drive unit is also used to connect to an external circuit. The third end of the series drive unit is connected to the second end of the power unit, and the fourth end of the series drive unit is connected to the third end of the power unit and the fourth end of the switch unit.

7. The relay device according to claim 6, characterized in that, The series driving unit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a first optocoupler thyristor, and a second optocoupler thyristor. One end of the third resistor is connected to the second end of the main control unit, the other end of the third resistor is connected to the first end of the first optocoupler thyristor, the second end of the first optocoupler thyristor is connected to the first end of the second optocoupler thyristor, the third end of the first optocoupler thyristor is connected to one end of the fourth resistor, and the fourth end of the first optocoupler thyristor is connected to the third end of the second optocoupler thyristor. The other end of the fourth resistor is connected to one end of the first capacitor and one end of the fifth resistor. The other end of the first capacitor is connected to the other end of the sixth resistor. The other end of the fifth resistor is connected to the first end of the power unit and the third end of the switching unit. The other end of the fifth resistor is also used to connect to an external circuit. The second terminal of the second optocoupler thyristor is grounded, the fourth terminal of the second optocoupler thyristor is connected to one end of the sixth resistor and the second terminal of the power unit, and the other end of the sixth resistor is connected to the third terminal of the power unit and the fourth terminal of the switching unit.

8. The relay device according to claim 7, characterized in that, The power unit includes: a silicon controlled rectifier (SCR); The first end of the thyristor is connected to the other end of the fifth resistor and the third end of the switching unit. The first end of the thyristor is also used to connect to an external circuit. The second end of the thyristor is connected to one end of the sixth resistor and the fourth end of the second optocoupler thyristor; The third terminal of the thyristor is connected to the other terminal of the sixth resistor, the fourth terminal of the switching unit, and the other terminal of the first capacitor.

9. The relay device according to claim 1, characterized in that, The relay device further includes: a seventh resistor; One end of the seventh resistor is connected to the first end of the switching unit, and the other end of the seventh resistor is connected to the power supply.

10. The relay device according to claim 1, characterized in that, The second end of the driving unit is connected to the first live wire of the external circuit, and the third end of the driving unit is connected to the second live wire of the external circuit.

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