Permanent-action abnormal working condition control circuit

Abstract

The invention relates to the technical field of electronic circuits, in particular to a permanent action abnormal working condition control circuit which comprises a photoelectric coupler, a trigger control circuit, a trigger device and a reset circuit. The trigger control circuit is electrically connected with the trigger device through the photoelectric coupler, and the trigger device is connected in series with the power-on circuit; when the trigger control circuit is externally connected with an abnormal working condition signal, the trigger control circuit controls the photoelectric coupler to be switched on, and the trigger device is enabled to be permanently switched to the off state; the reset circuit is electrically connected with the trigger device; when the reset circuit is started, the enabling trigger device is permanently switched to a closed state; the power consumption problem and the reliability problem of an existing abnormal working condition control circuit are solved.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to an abnormal operating condition control circuit with permanent operation. Background Technology

[0002] Many electrical devices currently incorporate abnormal operating condition control circuits in their electronic circuits to trigger interlocking protection in situations such as fires, short circuits, and overcurrents. However, these control circuits typically require prolonged power supply. For example, a control circuit consisting of a microcontroller (such as an MCU) and a triggering device via switching transistors requires the entire control path from the microcontroller to the triggering device to remain energized. This allows the triggering device to control the target object (such as the live and neutral wires, or a specific functional module) to perform protective actions when abnormal operating conditions occur and to reset when the abnormal operating conditions disappear. This leads to the following problems with the control circuits:

[0003] (1) The control circuit needs to be kept powered on for a long time, that is, the neutral and live wires are not disconnected and are kept in a powered state for a long time, resulting in high power consumption.

[0004] (2) When the abnormal working condition does not disappear, but the microcontroller signal fault disappears, the trigger device triggers the action to reset, and the target object will face the abnormal working condition again. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to propose a permanent abnormal operating condition control circuit, which solves the power consumption and reliability problems of existing abnormal operating condition control circuits.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An abnormal operating condition control circuit with permanent operation includes an optocoupler, a trigger control circuit, a trigger device, and a reset circuit; the trigger control circuit is electrically connected to the trigger device via the optocoupler, and the trigger device is connected in series with a power-on line;

[0008] When the trigger control circuit receives an abnormal operating condition signal, the trigger control circuit controls the optocoupler to turn on, enabling the trigger device to permanently switch to the off state;

[0009] The reset circuit and the trigger device are electrically connected; when the reset circuit is activated, the trigger device is permanently switched to the closed state.

[0010] Furthermore, the triggering device is a magnetically latched dual-coil relay, with one end contact of the triggering device connected in series with the other end contact in the power-on circuit. The optocoupler is electrically connected to the disconnection control coil of the triggering device, and the reset circuit is electrically connected to the closing control coil of the triggering device.

[0011] Furthermore, it also includes resistor R4; the anode of the light source of the optocoupler is electrically connected to the trigger control circuit, the cathode of the light source of the optocoupler is connected to the SGND ground terminal, the collector of the light receiver of the optocoupler is connected to the power supply voltage, the emitter of the light receiver of the optocoupler is electrically connected to the positive terminal of the disconnection control coil of the trigger device through the resistor R4, and the negative terminal of the disconnection control coil of the trigger device is connected to the PGND ground terminal.

[0012] Furthermore, the trigger control circuit includes a transistor Q2, resistors R1, R2, and R3, a capacitor C1, and a diode D1. The collector of transistor Q2 is electrically connected to the anode of the light source of the optocoupler. The emitter of transistor Q2, one end of resistor R2, and one end of capacitor C1 are all electrically connected to one end of resistor R1. The other end of capacitor C1 is connected to the SGND ground terminal. The base of transistor Q2 and the other end of resistor R2 are all electrically connected to one end of resistor R3. The other end of resistor R1 is electrically connected to the cathode of diode D1. The anode of diode D1 is electrically connected to the other end of resistor R3. The anode of diode D1 is used to connect to the external abnormal operating condition signal or charging voltage.

[0013] Furthermore, the reset circuit includes a diode D2 and a power supply port CN1; the positive terminal of the power supply port CN1 is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the positive terminal of the closing control coil of the trigger device, and the negative terminal of the power supply port CN1 is electrically connected to the negative terminal of the closing control coil of the trigger device.

[0014] Furthermore, the triggering device is a magnetically latched single-coil relay, with one end contact of the triggering device connected in series with the other end contact in the power-on circuit, and the reset circuit and the optocoupler are both electrically connected to the coil of the triggering device.

[0015] The technical solution provided by this invention can include the following beneficial effects: Since the energized circuit may be a high-voltage circuit, such as a live wire and a neutral wire, an optocoupler is first required to achieve electrical isolation. Then, an external abnormal operating condition signal (which can be emitted from the control board and is not limited by source) is connected to the trigger control circuit. The trigger control circuit controls the optocoupler to briefly conduct (it is disconnected the rest of the time), enabling the trigger device to permanently switch to the disconnected state, thus disconnecting the energized circuit (i.e., disconnecting the live and neutral wires). Simultaneously, a reset circuit is briefly activated (it is deactivated the rest of the time), enabling the trigger device to permanently switch to the closed state, thus reconnecting the energized circuit. Therefore, the control circuit does not need to maintain power control for a long time; only a brief trigger is needed to achieve permanent operation. Power consumption is negligible, and the closed and open states are controlled separately, avoiding the risk of protection reset due to control signal failure. Attached Figure Description

[0016] Figure 1 This is a circuit diagram of a permanent abnormal operating condition control circuit according to one embodiment of the present invention.

[0017] The components include: optocoupler 3, trigger control circuit 1, trigger device 4, reset circuit 2, resistor R4, transistor Q2, resistor R1, resistor R2, resistor R3, capacitor C1, and diode D1. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0021] The following is combined Figure 1 This describes an abnormal operating condition control circuit with permanent operation according to an embodiment of the present invention.

[0022] An abnormal operating condition control circuit with permanent operation includes an optocoupler 3, a trigger control circuit 1, a trigger device 4, and a reset circuit 2; the trigger control circuit 1 is electrically connected to the trigger device 4 via the optocoupler 3, and the trigger device 4 is connected in series with the power supply line;

[0023] When the trigger control circuit 1 receives an abnormal operating condition signal, the trigger control circuit 1 controls the optocoupler 3 to turn on, enabling the trigger device 4 to be permanently switched to the off state.

[0024] The reset circuit 2 and the trigger device 4 are electrically connected; when the reset circuit 2 is activated, the trigger device 4 is permanently switched to the closed state.

[0025] In a preferred embodiment of the abnormal operating condition control circuit for permanent operation proposed in this invention, such as... Figure 1 As shown, since the energized circuit may be a high-voltage circuit, such as a live wire and a neutral wire, an optocoupler 3 is first required to achieve electrical isolation. Then, an external abnormal operating condition signal (which can be sent from the control board and is not limited by source) is connected to the trigger control circuit 1. The trigger control circuit 1 controls the optocoupler 3 to conduct briefly (it is disconnected the rest of the time), enabling the trigger device 4 to permanently switch to the disconnected state, thus disconnecting the energized circuit (i.e., disconnecting the live and neutral wires). At the same time, the reset circuit 2 is briefly activated (it is deactivated the rest of the time), enabling the trigger device 4 to permanently switch to the closed state, thus reconnecting the energized circuit. This allows the control circuit to achieve permanent operation without maintaining power control for a long time, requiring only a brief trigger. The power consumption is negligible, and the closed and open states are controlled separately, avoiding the risk of protection reset due to control signal failure.

[0026] Furthermore, the triggering device 4 is a magnetically latched double-coil relay, with one end contact of the triggering device 4 connected in series with the other end contact in the power-on circuit. The optocoupler 3 is electrically connected to the disconnection control coil of the triggering device 4, and the reset circuit 2 is electrically connected to the closing control coil of the triggering device 4.

[0027] In this embodiment, to separate and independently control the closed and open states, avoid signal interference, and improve operational reliability, the triggering device 4 is preferably a magnetically latched dual-coil relay, where two coils control the closing and opening of a set of contacts. It should be noted that the open or closed state of the magnetically latched relay does not require coil energization to maintain.

[0028] Furthermore, it also includes resistor R4; the anode of the light source of optocoupler 3 is electrically connected to the trigger control circuit 1, the cathode of the light source of optocoupler 3 is connected to the SGND ground terminal, the collector of the light receiver of optocoupler 3 is connected to the power supply voltage, the emitter of the light receiver of optocoupler 3 is electrically connected to the positive terminal of the disconnection control coil of trigger device 4 through resistor R4, and the negative terminal of the disconnection control coil of trigger device 4 is connected to the PGND ground terminal.

[0029] In this embodiment, the optocoupler 3 is controlled to be turned on after the trigger control circuit 1 receives an abnormal operating condition signal, so as to permanently switch the trigger device 4 to the off state. Therefore, the photodetector of the optocoupler 3 is connected to the power supply voltage (such as 12V) and the disconnection control coil of the trigger device 4 (i.e., pins 2 and 6). After the optocoupler 3 is turned on, the power supply voltage briefly supplies power to the disconnection control coil. After the contact group of the trigger device 4 is disconnected, the optocoupler 3 is disconnected again, and the control circuit no longer generates current, thereby reducing power consumption.

[0030] Furthermore, the trigger control circuit 1 includes a transistor Q2, resistors R1, R2, and R3, a capacitor C1, and a diode D1. The collector of transistor Q2 is electrically connected to the anode of the light source of optocoupler 3. The emitter of transistor Q2, one end of resistor R2, and one end of capacitor C1 are all electrically connected to one end of resistor R1. The other end of capacitor C1 is connected to the SGND ground terminal. The base of transistor Q2 and the other end of resistor R2 are all electrically connected to one end of resistor R3. The other end of resistor R1 is electrically connected to the cathode of diode D1. The anode of diode D1 is electrically connected to the other end of resistor R3. The anode of diode D1 is used to connect to an external abnormal operating condition signal or charging voltage.

[0031] In this embodiment, the trigger control circuit 1 consists of a switching circuit composed of transistor Q2, resistors R1, R2, and R3, capacitor C1, and diode D1, and has two operating states:

[0032] (1) When no abnormal operating conditions occur, the “L / N-OPEN” receives the charging voltage (e.g., 3.3V) and charges the capacitor C1 through diode D1 and resistor R1 to store charge energy. The voltage at point “A” of the positive terminal of capacitor C1 is always lower than the 3.3V charging voltage of “L / N-OPEN” by the Vf conduction voltage difference of diode D1, so that transistor Q2 does not conduct; at this time, there is no current in the light source of optocoupler 3, optocoupler 3 does not work, and no current is formed on the light receiver side of optocoupler 3, resulting in extremely low power consumption.

[0033] (2) When an abnormal operating condition occurs, “L / N-OPEN” is pulled down to 0V (i.e., an abnormal operating condition signal is received). At this time, although the “L / N-OPEN” voltage is 0, “A” still has a voltage of about 3V because capacitor C1 stores a large amount of charge; therefore, transistor Q2 is turned on, and a current is formed for a period of time on the light source side and the light receiver side of optocoupler 3, which energizes the disconnection control coil from pin 6 to pin 2 of trigger device 4, and the trigger contact group switches to the disconnected state.

[0034] Furthermore, the reset circuit 2 includes a diode D2 and a power supply port CN1; the positive terminal of the power supply port CN1 is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the positive terminal of the closing control coil of the trigger device 4, and the negative terminal of the power supply port CN1 is electrically connected to the negative terminal of the closing control coil of the trigger device 4.

[0035] In this embodiment, to ensure the permanence of abnormal operating conditions, the reset circuit 2 is preferably composed of diode D2 and power supply port CN1, wherein diode D2 is used to prevent the positive and negative terminals of the power supply electrically connected to power supply port CN1 from being reversed. The user can selectively apply voltage (e.g., 12V) from power supply port CN1 as needed to energize the closing control coil of pin 6 to pin 1 of trigger device 4, and switch the trigger contact group to the closed state.

[0036] Furthermore, the triggering device 4 is a magnetic latching single-coil relay, with one end contact of the triggering device 4 connected in series with the other end contact in the power-on circuit. The reset circuit 2 and the optocoupler 3 are both electrically connected to the coil of the triggering device 4.

[0037] In this embodiment, the triggering device 4 can also be selected as a magnetically latched single-coil relay. Its principle of permanent operation is as follows: when the single-coil magnetically latched relay is energized, the current in the coil forms a stable magnetic field through the electromagnet. This magnetic field attracts the relay contacts, causing them to close (equivalent to the reset circuit 2 starting, providing power briefly, and then permanently switching the triggering device 4 to the closed state). After the power is turned off, the relay in the closed state can continue to operate without requiring additional current. If it is necessary to open the relay, a reverse-phase pulse current needs to be applied to eliminate the magnetic field, thereby restoring the contacts to the open state (equivalent to the trigger control circuit 1 briefly turning on the optocoupler 3, then providing a reverse current to the coil, enabling the triggering device 4 to permanently switch to the open state).

[0038] Other configurations and operations of a permanent abnormal operating condition control circuit according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0039] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A permanent abnormal operating condition control circuit, characterized in that: It includes an optocoupler, a trigger control circuit, a trigger device, and a reset circuit; the trigger control circuit is electrically connected to the trigger device via the optocoupler, and the trigger device is connected in series with a power line; When the trigger control circuit receives an abnormal operating condition signal, the trigger control circuit controls the optocoupler to turn on, enabling the trigger device to permanently switch to the off state; The reset circuit and the trigger device are electrically connected; when the reset circuit is activated, the trigger device is enabled to permanently switch to the closed state.

2. The abnormal operating condition control circuit for permanent operation according to claim 1, characterized in that: The triggering device is a magnetically latched dual-coil relay. One end contact of the triggering device is connected in series with the other end contact in the power-on circuit. The optocoupler is electrically connected to the disconnection control coil of the triggering device, and the reset circuit is electrically connected to the closing control coil of the triggering device.

3. The abnormal operating condition control circuit with permanent operation according to claim 2, characterized in that: It also includes resistor R4; the anode of the light source of the optocoupler is electrically connected to the trigger control circuit, the cathode of the light source of the optocoupler is connected to the SGND ground terminal, the collector of the light receiver of the optocoupler is connected to the power supply voltage, the emitter of the light receiver of the optocoupler is electrically connected to the positive terminal of the disconnection control coil of the trigger device through the resistor R4, and the negative terminal of the disconnection control coil of the trigger device is connected to the PGND ground terminal.

4. The abnormal operating condition control circuit with permanent operation according to claim 3, characterized in that: The trigger control circuit includes a transistor Q2, resistors R1, R2, and R3, a capacitor C1, and a diode D1. The collector of transistor Q2 is electrically connected to the anode of the light source of the optocoupler. The emitter of transistor Q2, one end of resistor R2, and one end of capacitor C1 are all electrically connected to one end of resistor R1. The other end of capacitor C1 is connected to SGND (ground). The base of transistor Q2 and the other end of resistor R2 are all electrically connected to one end of resistor R3. The other end of resistor R1 is electrically connected to the cathode of diode D1. The anode of diode D1 is electrically connected to the other end of resistor R3. The anode of diode D1 is used to connect to the abnormal operating condition signal or charging voltage.

5. The abnormal operating condition control circuit for permanent operation according to claim 3, characterized in that: The reset circuit includes a diode D2 and a power supply port CN1; the positive terminal of the power supply port CN1 is electrically connected to the anode of the diode D2, the cathode of the diode D2 is electrically connected to the positive terminal of the closing control coil of the trigger device, and the negative terminal of the power supply port CN1 is electrically connected to the negative terminal of the closing control coil of the trigger device.

6. The abnormal operating condition control circuit for permanent operation according to claim 1, characterized in that: The triggering device is a magnetic latching single-coil relay. One end contact of the triggering device is connected in series with the other end contact in the power-on circuit. The reset circuit and the optocoupler are both electrically connected to the coil of the triggering device.

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