Contactor control trigger circuit, substrate and contactor

Abstract

The utility model provides a contactor control trigger circuit, a substrate and a contactor, the contactor control trigger circuit comprises a voltage division circuit, a reference circuit, a level conversion circuit and a hysteresis control switch circuit, and the voltage division circuit comprises a second resistor; the voltage division circuit divides an input voltage and outputs a first voltage; the reference circuit receives a first voltage and outputs a second voltage according to the first voltage. The level conversion circuit performs level conversion on the second voltage to generate a control signal; the hysteresis control switch circuit enables the second resistor to be short-circuited according to the control signal, so that the voltage division circuit outputs third voltage which is the first voltage. The contactor is attracted and released through the reference circuit and the level conversion circuit, and when the contactor is attracted, the second resistor is short-circuited through the hysteresis control switch circuit, so that the voltage division circuit outputs third voltage higher than the first voltage, the output voltage of the voltage division circuit is increased, repeated attraction and release of the contactor are reduced, and false triggering is reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic technologies, and particularly to a contactor control trigger circuit, a substrate, and a contactor. Background Art

[0002] A contactor is a common switching electrical appliance that uses electromagnetic, pneumatic, or hydraulic principles to conduct or cut off a device through a control circuit, and is widely used in various control circuit scenarios.

[0003] With the widespread application of electronic technologies in the field of contactors, there are increasingly high requirements for miniaturization, energy conservation, stable triggering, and anti-misoperation of contactors. For purely structural contactors, due to their structural differences, it is difficult to achieve triggering at a fixed voltage point. Especially when the contactor is at the critical triggering voltage point, the existing control trigger circuit using a common voltage comparison mode will cause the contactor to have a situation of repeated suction and release, resulting in mis-triggering and unstable working performance of the contactor. Summary of the Utility Model

[0004] The present application provides a contactor control trigger circuit, a substrate, and a contactor to solve the problem of repeated suction and release leading to mis-triggering when the contactor is at the critical triggering voltage point. The specific solutions are as follows:

[0005] In a first aspect, the present application provides a contactor control trigger circuit, and the contactor control trigger circuit includes: a voltage division circuit, a reference circuit, a level conversion circuit, and a hysteresis control switch circuit, and the voltage division circuit includes a second resistor;

[0006] The input end of the voltage division circuit is electrically connected to an input voltage, the first output end of the voltage division circuit is electrically connected to the first output end of the hysteresis control switch circuit, and the second output end of the voltage division circuit is respectively electrically connected to the second output end of the hysteresis control switch circuit and the input end of the reference circuit; the output end of the reference circuit is electrically connected to the input end of the level conversion circuit; the output end of the level conversion circuit is electrically connected to the input end of the hysteresis control switch circuit;

[0007] The voltage division circuit is configured to divide the input voltage, output a first voltage, and transmit the first voltage to the reference circuit;

[0008] The reference circuit is configured to receive the first voltage, output a second voltage according to the first voltage, and transmit the second voltage to the level conversion circuit;

[0009] The level conversion circuit is configured to perform level conversion on the second voltage to generate a control signal, and the control signal is used to control the contactor to be attracted or released;

[0010] The hysteresis control switch circuit is used to short - circuit the second resistor according to the control signal, so that the voltage - dividing circuit outputs a third voltage, and the third voltage is greater than the first voltage.

[0011] The energization and release of the contactor are realized through the reference circuit and the level - conversion circuit. When the contactor is energized, the second resistor is short - circuited through the hysteresis control switch circuit, so that the voltage - dividing circuit outputs a third voltage higher than the first voltage. Without changing the input voltage, the output voltage of the voltage - dividing circuit is raised. When the input voltage decreases, the contactor is released. It is realized that the minimum energization voltage of the contactor is higher than the minimum release voltage, and the repeated energization and release of the contactor can be effectively reduced at the critical trigger voltage point, reducing mis - triggering, and further making the working performance of the contactor stable.

[0012] In a possible design, the voltage - dividing circuit further includes: a first resistor and a third resistor;

[0013] The first end of the first resistor is electrically connected to the input voltage, and the second end of the first resistor is respectively electrically connected to the first end of the second resistor and the first output end of the voltage - dividing circuit;

[0014] The second end of the second resistor is respectively electrically connected to the first end of the third resistor and the second output end of the voltage - dividing circuit;

[0015] The second end of the third resistor is grounded.

[0016] In a possible design, the reference circuit includes: a reference device, a fourth resistor, a fifth resistor, and a first capacitor;

[0017] The first end of the fifth resistor is electrically connected to the input end of the reference circuit, and the second end of the fifth resistor is respectively electrically connected to the first end of the first capacitor and the second end of the reference device;

[0018] The second end of the first capacitor is grounded;

[0019] The first end of the reference device is respectively electrically connected to the output end of the reference circuit and the second end of the fourth resistor, and the third end of the reference device is grounded;

[0020] The first end of the fourth resistor is electrically connected to the control - system power supply.

[0021] In a possible design, the level - conversion circuit includes: a sixth resistor, a seventh resistor, and an inverter;

[0022] The first end of the sixth resistor is electrically connected to the input end of the level - conversion circuit, and the second end of the sixth resistor is respectively electrically connected to the first end of the seventh resistor and the input end of the inverter;

[0023] The output end of the inverter is electrically connected to the output end of the level conversion circuit;

[0024] The second end of the seventh resistor is grounded.

[0025] In a possible design, the hysteresis control switch circuit includes: an eighth resistor, a ninth resistor, a first transistor, and a second transistor;

[0026] The first end of the eighth resistor is electrically connected to the input end of the hysteresis control switch circuit, and the second end of the eighth resistor is electrically connected to the control end of the second transistor;

[0027] The first end of the second transistor is electrically connected to the first end of the ninth resistor, and the second end of the second transistor is grounded;

[0028] The second end of the ninth resistor is electrically connected to the control end of the first transistor;

[0029] The first end of the first transistor is electrically connected to the first output end of the hysteresis control switch circuit, and the second end of the first transistor is electrically connected to the second output end of the hysteresis control switch circuit.

[0030] In a possible design, the reference device is TL431, AZ431, or AZ432.

[0031] In a possible design, the inverter is a Schmitt inverter.

[0032] In a possible design, the first transistor and the second transistor are MOS transistors, optocouplers, or triodes.

[0033] In a second aspect, the present application provides a contactor control trigger circuit board, including: the contactor control trigger circuit described in the first aspect above.

[0034] In a third aspect, the present application provides a contactor, including: the contactor control trigger circuit board described in the second aspect above.

[0035] For what is provided in the second aspect above and each possible design of the second aspect, the beneficial effects can refer to the beneficial effects brought by the first aspect above and each possible implementation manner of the first aspect, which will not be elaborated here. Description of the Drawings

[0036] Figure 1 It is a schematic structural diagram of a contactor control trigger circuit provided by an embodiment of the present application;

[0037] Figure 2A contactor control trigger circuit diagram provided by an embodiment of the present application. Detailed implementation manners

[0038] In the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may indicate: A exists alone, A and B exist simultaneously, and B exists alone, where A and B may be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a alone, b alone, or c alone may indicate: a alone, b alone, c alone, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b, and c, where a, b, and c may be single or multiple. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0040] The terms "connected" and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a circuit structure may refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it may be a direct connection, that is, a physical connection, or may be indirectly connected through at least one intermediate element, as long as the circuit is connected, and may also be the internal connection of two elements; the signal connection may refer not only to the signal connection through a circuit, but also to the signal connection through a media medium. For example, radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] In order to solve the problem of repeated suction and release resulting in mis-triggering when the contactor is at the critical trigger voltage point in the prior art, the present application provides a contactor control trigger circuit. See Figure 1 , Figure 1 is a schematic structural diagram of a contactor control trigger circuit provided by an embodiment of the present application. As Figure 1As shown, the contactor control trigger circuit 1000 may include: a voltage division circuit 100, a reference circuit 200, a level conversion circuit 300, and a hysteresis control switch circuit 400. The voltage division circuit 100 includes a second resistor.

[0042] The input end of the voltage division circuit 100 is electrically connected to the input voltage Vin. The first output end of the voltage division circuit 100 is electrically connected to the first output end of the hysteresis control switch circuit 400. The second output end of the voltage division circuit 100 is respectively electrically connected to the second output end of the hysteresis control switch circuit 400 and the input end of the reference circuit 200. The output end of the reference circuit 200 is electrically connected to the input end of the level conversion circuit 300. The output end of the level conversion circuit 300 is electrically connected to the input end of the hysteresis control switch circuit 400.

[0043] The voltage division circuit 100 is configured to divide the input voltage Vin, output a first voltage, and transmit the first voltage to the reference circuit.

[0044] The reference circuit 200 is configured to receive the first voltage, output a second voltage according to the first voltage, and transmit the second voltage to the level conversion circuit.

[0045] The level conversion circuit 300 is configured to perform level conversion on the second voltage to generate a control signal TRIG, and the control signal is used to control the contactor to be attracted or released.

[0046] The hysteresis control switch circuit 400 is configured to short-circuit the second resistor according to the control signal, so that the voltage division circuit outputs a third voltage, and the third voltage is greater than the first voltage.

[0047] The contactor involved in the present utility model is a DC contactor. The contactor control trigger circuit in this application is used in an electronic DC contactor control circuit.

[0048] The contactor control trigger circuit in this application is used to output a control signal of the contactor, and control the contactor to be attracted or released through the control signal. In one example, when the control signal is at a high level, the contactor is attracted; when the control signal is at a low level, the contactor is released. For example, when the control signal is 3.3V, the contactor is attracted; when the control signal is 0V, the contactor is released. In normal use, the attraction voltage of the contactor is higher than the release voltage.

[0049] In one example, the control signal can control the coil voltage or coil current of the contactor through a MOS transistor (Metal Oxide Semiconductor Field Effect Transistor), a power triode, an IGBT (Insulate-Gate Bipolar Transistor), or an adjustable power supply, so as to control the contactor to be attracted or released.

[0050] The input voltage is divided by a voltage dividing circuit to obtain a first voltage. The reference circuit generates a varying second voltage based on the first voltage, and then the second voltage is level-converted by a level conversion circuit to generate a control signal. The control signal is used to control the contactor to be attracted or released. The control signal controls the hysteresis control switch circuit to short-circuit the second resistor, so that the voltage dividing circuit outputs a third voltage. Since the third voltage is greater than the first voltage, that is, the contactor control trigger circuit in the present application can increase the output voltage of the voltage dividing circuit when the contactor is attracted, and control the contactor to release when the input voltage decreases. Before the contactor is triggered, the voltage dividing circuit outputs the first voltage, and after the contactor is triggered, the voltage dividing circuit outputs the third voltage. The voltage output by the voltage dividing circuit after the contactor is triggered is greater than the voltage output by the voltage dividing circuit before the contactor is triggered.

[0051] In the present application, the attraction and release of the contactor are realized through the reference circuit and the level conversion circuit. When the contactor is attracted, the hysteresis control switch circuit short-circuits the second resistor, so that the voltage dividing circuit outputs a third voltage higher than the first voltage. Without changing the input voltage, the output voltage of the voltage dividing circuit is raised. When the input voltage decreases, the contactor is released. It is realized that the minimum attraction voltage of the contactor is higher than the minimum release voltage, and the repeated attraction and release of the contactor can be effectively reduced at the critical trigger voltage point, reducing mis-triggering, and thus making the working performance of the contactor stable.

[0052] In a possible embodiment, refer to Figure 2 , Figure 2 is a contactor control trigger circuit diagram provided by the present application. As shown in Figure 2 , in addition to the second resistor R2, the voltage dividing circuit 100 further includes: a first resistor R1 and a third resistor R3.

[0053] The first end of the first resistor R1 is electrically connected to the input voltage Vin, and the second end of the first resistor R1 is respectively electrically connected to the first end of the second resistor R2 and the first output end of the voltage dividing circuit 100.

[0054] The second end of the second resistor R2 is respectively electrically connected to the first end of the third resistor R3 and the second output end VI of the voltage dividing circuit 100.

[0055] The second terminal of the third resistor R3 is grounded.

[0056] In a possible embodiment, referring to Figure 2 , as Figure 2 shown, the reference circuit 200 includes: a reference device U1, a fourth resistor R4, a fifth resistor R5, and a first capacitor C1.

[0057] The first terminal of the fifth resistor R5 is electrically connected to the input terminal of the reference circuit, and the second terminal of the fifth resistor R5 is respectively electrically connected to the first terminal of the first capacitor C1 and the second terminal of the reference device U1.

[0058] The second terminal of the first capacitor C1 is grounded.

[0059] The first terminal of the reference device U1 is respectively electrically connected to the output terminal of the reference circuit and the second terminal of the fourth resistor R4, and the third terminal of the reference device U1 is grounded.

[0060] The first terminal of the fourth resistor R4 is electrically connected to the control system power supply VCC.

[0061] VCC is the control system power supply, which is used to supply power to the chip devices in the contactor control trigger circuit. In practical applications, it can be obtained by processing the input voltage Vin through an LDO (low dropout regulator) or a DC-DC (direct current - direct current converter). Generally, for chip devices, VCC needs to be stabilized first before they can work properly.

[0062] In a possible embodiment, referring to Figure 2 , as Figure 2 shown, the level conversion circuit 300 includes: a sixth resistor R6, a seventh resistor R7, and an inverter U2.

[0063] The first terminal of the sixth resistor R6 is electrically connected to the input terminal of the level conversion circuit 300, and the second terminal of the sixth resistor R6 is respectively electrically connected to the first terminal of the seventh resistor R7 and the input terminal of the inverter U2.

[0064] The output terminal of the inverter U2 is electrically connected to the output terminal of the level conversion circuit 300.

[0065] The second terminal of the seventh resistor R7 is grounded.

[0066] In a possible embodiment, referring to Figure 2 , as Figure 2 shown, the hysteresis control switch circuit 400 includes: an eighth resistor R8, a ninth resistor R9, a first transistor Q1, and a second transistor Q2.

[0067] The first end of the eighth resistor R8 is electrically connected to the input end of the hysteresis control switch circuit 400, and the second end of the eighth resistor R8 is electrically connected to the control end of the second transistor Q2.

[0068] The first end of the second transistor Q2 is electrically connected to the first end of the ninth resistor R9, and the second end of the second transistor Q2 is grounded;

[0069] The second end of the ninth resistor R9 is electrically connected to the control end of the first transistor Q1.

[0070] The first end of the first transistor Q1 is electrically connected to the first output end of the hysteresis control switch circuit 400, and the second end of the first transistor Q1 is electrically connected to the second output end of the hysteresis control switch circuit 400.

[0071] In a possible embodiment, the reference device may be TL431, AZ431 or AZ432.

[0072] For example, U1 is TL431, which is composed of an operational amplifier, a triode and two diodes inside, and has an internal precision reference voltage of 2.5V. Those skilled in the art can understand that according to the different voltages input at the second end, the voltages output at the first end of TL431 will also be different. For example, when the input voltage at the second end of TL431 is greater than 2.5V, the voltage output at the first end of TL431 is high level; when the input voltage at the second end of TL431 is less than 2.5V, the voltage output at the first end of TL431 is low level.

[0073] Due to the small volume of the reference device, the size of the PCBA (Printed Circuit Board Assembly) can be greatly reduced for the contactor. In addition, the reference device uses a general adjustable voltage reference chip, which can effectively reduce costs compared with using an MCU.

[0074] In addition, in addition to the above-listed TL431, AZ431 or AZ432 voltage reference chips, the reference device can also be other voltage reference chips. For example, TL432. Compared with TL431, the difference between the two is the order of the chip pins and they are not compatible, but the internal reference voltage values are the same, both 2.5V. Compared with TL431, AZ432 has compatible chip pins, but the internal reference voltage values of the two are different. The internal reference voltage value of TL431 is 2.5V, and the internal reference voltage value of AZ432 is 1.25V.

[0075] In a possible embodiment, the inverter may be a Schmitt inverter.

[0076] Since the Schmidt inverter has the hysteresis characteristic of a Schmidt trigger, it can effectively resist interference and prevent mis-triggering.

[0077] In a possible embodiment, the first transistor and the second transistor can be MOS transistors, optocouplers, or triodes.

[0078] In a specific embodiment, taking U1 as TL431, the first transistor Q1 as a P-type triode, and the second transistor Q2 as an N-type triode as an example for illustration, see Figure 2 , and its working principle is as follows: After the input voltage Vin is divided by R1, R2, and R3, the output voltage VI charges C1 through R5. At the moment of power-on, the output voltage VI will rise slowly. Since the VCC supplying power to U1 is already stable, at this time, the voltage value of VI is less than the internal reference voltage of U1. The first terminal 1 of U1 outputs a high voltage. After being divided by R6 and R7, the input terminal of U2 is at a high level. After level conversion by U2, the output terminal of U2 is at a low level, that is, the control signal TRIG is at a low level, and Q1 and Q2 are cut off. At this time, VI = Vin * R3 / (R1 + R2 + R3), that is, the first voltage. As C1 finishes charging, the voltage of C1 (i.e., VI) is greater than the internal reference voltage of U1. The first terminal 1 of U1 outputs a low voltage. After being divided by R6 and R7, the input terminal of U2 is at a low level. After level conversion by U2, the output terminal of U2 is at a high level, that is, the control signal TRIG is at a high level. At this time, the control signal TRIG controls the contactor to close, and Q1 and Q2 are turned on, and R2 is short-circuited. At this time, VI = Vin * R3 / (R1 + R3), that is, the third voltage. By comparison, it can be seen that the third voltage is greater than the first voltage, that is, the voltage after the contactor is triggered is higher than the voltage before triggering. At this time, if it is necessary to control the contactor to release, the control signal TRIG needs to be at a low level, that is, the output terminal of U2 is at a low level, and VI needs to be at a low level, which can be achieved by reducing the input voltage Vin.

[0079] Through the contactor control trigger circuit of this embodiment, the closing and releasing of the contactor can be controlled by the input voltage Vin. For example, when Vin is higher than 18V, the contactor is controlled to close; when Vin is lower than 10V, the contactor is controlled to release. And it satisfies the control logic that the minimum closing voltage is higher than the minimum releasing voltage, and can effectively reduce the repeated closing and releasing of the contactor at the critical trigger voltage point, reduce mis-triggering, and thus make the working performance of the contactor stable.

[0080] The embodiment of the present application also provides a contactor control trigger circuit board, including: the contactor control trigger circuit as described above.

[0081] The embodiment of the present application also provides a contactor, including: the contactor control trigger circuit board as described above.

[0082] Finally, it should be noted that the above embodiments are only specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A contactor control trigger circuit, characterized in that The contactor control trigger circuit includes: a voltage dividing circuit, a reference circuit, a level conversion circuit, and a hysteresis control switch circuit. The voltage dividing circuit includes a second resistor; The input end of the voltage dividing circuit is electrically connected to the input voltage. The first output end of the voltage dividing circuit is electrically connected to the first output end of the hysteresis control switch circuit. The second output end of the voltage dividing circuit is respectively electrically connected to the second output end of the hysteresis control switch circuit and the input end of the reference circuit. The output end of the reference circuit is electrically connected to the input end of the level conversion circuit. The output end of the level conversion circuit is electrically connected to the input end of the hysteresis control switch circuit; The voltage dividing circuit is used to divide the input voltage, output a first voltage, and transmit the first voltage to the reference circuit; The reference circuit is used to receive the first voltage, output a second voltage according to the first voltage, and transmit the second voltage to the level conversion circuit; The level conversion circuit is used to perform level conversion on the second voltage to generate a control signal, and the control signal is used to control the contactor to be attracted or released; The hysteresis control switch circuit is used to short-circuit the second resistor according to the control signal, so that the voltage dividing circuit outputs a third voltage, and the third voltage is greater than the first voltage.

2. The contactor control trigger circuit according to claim 1, wherein The voltage dividing circuit further includes: a first resistor and a third resistor; The first end of the first resistor is electrically connected to the input voltage. The second end of the first resistor is respectively electrically connected to the first end of the second resistor and the first output end of the voltage dividing circuit; The second end of the second resistor is respectively electrically connected to the first end of the third resistor and the second output end of the voltage dividing circuit; The second end of the third resistor is grounded.

3. The contactor control trigger circuit according to claim 1, characterized in that, The reference circuit includes: a reference device, a fourth resistor, a fifth resistor, and a first capacitor; The first end of the fifth resistor is electrically connected to the input end of the reference circuit. The second end of the fifth resistor is respectively electrically connected to the first end of the first capacitor and the second end of the reference device; The second end of the first capacitor is grounded; The first end of the reference device is respectively electrically connected to the output end of the reference circuit and the second end of the fourth resistor. The third end of the reference device is grounded; The first end of the fourth resistor is electrically connected to the control system power supply.

4. The contactor control trigger circuit according to claim 1, characterized in that, The level conversion circuit includes: a sixth resistor, a seventh resistor, and an inverter; The first end of the sixth resistor is electrically connected to the input end of the level conversion circuit. The second end of the sixth resistor is respectively electrically connected to the first end of the seventh resistor and the input end of the inverter; The output end of the inverter is electrically connected to the output end of the level conversion circuit; The second end of the seventh resistor is grounded.

5. The contactor control trigger circuit according to claim 1, wherein, The hysteresis control switch circuit includes: an eighth resistor, a ninth resistor, a first transistor, and a second transistor; The first end of the eighth resistor is electrically connected to the input end of the hysteresis control switch circuit. The second end of the eighth resistor is electrically connected to the control end of the second transistor; The first end of the second transistor is electrically connected to the first end of the ninth resistor. The second end of the second transistor is grounded; The second end of the ninth resistor is electrically connected to the control end of the first transistor; The first end of the first transistor is electrically connected to the first output end of the hysteresis control switch circuit, and the second end of the first transistor is electrically connected to the second output end of the hysteresis control switch circuit.

6. The contactor control trigger circuit according to claim 3, wherein, The reference device is TL431, AZ431 or AZ432.

7. The contactor control trigger circuit according to claim 4, wherein The inverter is a Schmitt inverter.

8. The contactor control trigger circuit according to claim 5, wherein, The first transistor and the second transistor are MOS transistors, optocouplers or triodes.

9. A contactor control trigger circuit board, characterized in that, Comprising: The contactor control trigger circuit according to any one of claims 1-8.

10. A contactor, characterized in that, Comprising: The contactor control trigger circuit substrate according to claim 9.

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