Control circuit of double-coil control electric appliance

Abstract

The invention provides a control circuit of a double-coil control electric appliance, which relates to the technical field of power electronics and comprises a piezoresistor R1, a power conditioning module, a control module, a switch element, a voltage stabilizing element, a first coil and a second coil, the piezoresistor R1 is connected with the power supply conditioning module, the power supply conditioning module is connected with the control module, the first coil and the switch element, the first coil is connected with the control module, the second coil and the switch element, and the second coil is connected with the switch element. The control module is respectively connected with the first coil, the second coil and the switch element, the switch element is respectively connected with the first coil, the second coil and the voltage stabilizing element, and the second coil is connected with the voltage stabilizing element. According to the method, the overvoltage phenomenon is effectively eliminated, so that only the rated voltage parameter needs to be considered when the MOS tube is selected, and the overvoltage influence does not need to be additionally considered.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and particularly to a control circuit for a dual-coil control electrical appliance. Background Art

[0002] In the fields of power and electronic control, the dual-coil control contactor (relay), as an important electrical control component, is widely used in industrial automation, power system control, and various occasions requiring efficient and reliable electrical switching. The traditional design of the dual-coil control contactor usually includes an attracting coil for initial attraction and a holding coil for maintaining the contact closed state. This design aims to achieve both fast response and energy saving by controlling the energization state of the coil in stages.

[0003] The traditional dual-coil control contactor often adopts a control scheme of dual-coil parallel connection, that is, the attracting coil and the holding coil are connected in parallel to the control circuit. Although this scheme can meet the basic control requirements to a certain extent, it has many deficiencies: 1) Due to the parallel control, additional circuit components are required to coordinate the working states of the two coils, resulting in a complex overall structure of the control device, a large number of components, and an increase in manufacturing and maintenance costs.

[0004] 2) At the moment of switching between the attracting coil and the holding coil, due to the existence of coil inductance, a large back electromotive force will be generated, resulting in overvoltage at the switching break. This not only poses a threat to other components in the circuit but also may affect the reliability and service life of the contactor itself.

[0005] 3) Although the design intention of the holding coil is to reduce energy consumption, in actual operation, due to problems such as uneven current distribution in the parallel control mode, the holding power is still relatively high, and the energy-saving potential is not fully exerted.

[0006] 4) The complex control logic and high working stress accelerate the aging process of electronic components, shorten the overall life of the product, and increase the frequency of replacement and repair.

[0007] Therefore, a control circuit for a dual-coil control electrical appliance is proposed. Summary of the Invention

[0008] This specification provides a control for a dual-coil control electrical appliance, which effectively eliminates the overvoltage phenomenon, so that only the rated voltage parameter needs to be considered when selecting the MOS transistor, and the influence of overvoltage does not need to be considered additionally.

[0009] This specification provides a control for a dual-coil control electrical appliance, including: Varistor R1, power conditioning module, control module, switching element, voltage stabilizing element, first coil, second coil; The varistor R1 is connected to the power conditioning module, the power conditioning module is respectively connected to the control module, the first coil, and the switching element, the first coil is respectively connected to the control module, the second coil, and the switching element, the control module is respectively connected to the first coil, the second coil, and the switching element, the switching element is respectively connected to the first coil, the second coil, and the voltage stabilizing element, and the second coil is connected to the voltage stabilizing element.

[0010] Optionally, it includes: The input 1 and input 2 of the control electrical appliance obtain a closing signal, the first coil works, the switching element conducts, and the control electrical appliance is attracted, so as to ensure the ampere-turns during attraction; until the control electrical appliance is completely attracted, the control module controls the switching element to disconnect, the second coil works, and parameter conditioning is performed through the voltage stabilizing element to ensure the ampere-turns during holding.

[0011] Optionally, the power conditioning module includes diodes D1, D2, D3, D4. The positive electrode of diode D1 is respectively connected to the negative electrode of diode D2 and the varistor R1. The negative electrode of diode D1 is respectively connected to the negative electrode of diode D4, the control module, the first coil, and the varistor R1. The negative electrode of diode D4 is respectively connected to the control module and the first coil. The positive electrode of diode D4 is respectively connected to the negative electrode of diode D3 and the varistor R1. The negative electrode of diode D3 is connected to the varistor R1, and the positive electrode of diode D3 is connected to the positive electrode of diode D2.

[0012] Optionally, the control module includes: a resistor R6 connected to the negative electrode of diode D1 and the positive electrode of diode D4. Resistor R6 is respectively connected to resistor R7 and the negative electrode of Zener diode D21. Resistor R7 is connected to resistor R10, the first coil, the emitter of transistor Q5, capacitor C6, the negative electrode of Zener diode D24, and the switching element. The negative electrode of Zener diode D21 is respectively connected to the positive electrode of polarized capacitor C3 and resistor R3. The negative electrode of polarized capacitor C3 is connected to resistor R2. Resistor R2 is connected to resistor R3 and polarized capacitor C2; The emitter of the triode Q5 is connected to the capacitor C6, the negative electrode of the Zener diode D24, and the switching element. The base of the triode Q5 is respectively connected to the resistor R10 and the collector of the triode Q4. The collector of the triode Q5 is connected to the base of the triode Q4, and the emitter of the triode Q4 is grounded.

[0013] Optionally, the switching element includes a mechanical switch, a MOS transistor, and a relay.

[0014] Optionally, the switching element includes the MOS transistor Q6. The gate of the MOS transistor Q6 is connected to the negative electrode of the Zener diode D24. The drain of the MOS transistor Q6 is respectively connected to the first coil and the second coil, and the source of the MOS transistor Q6 is grounded.

[0015] Optionally, the voltage stabilizing element includes the Zener diode D25. The negative electrode of the Zener diode D25 is connected to the second coil, and the positive electrode of the Zener diode D25 is grounded.

[0016] In the present invention, firstly, the pulling-in coil can also serve as the holding coil, effectively reducing the number of turns of the coil and simplifying the design. Secondly, there is no need to install a bidirectional choke diode inside the DC coil. The overvoltage growth when the MOS transistor is cut off is limited, and experiments have proved that the overvoltage above 110V is still within the rated voltage range, effectively eliminating the overvoltage phenomenon. When selecting the MOS transistor, only the rated voltage parameter needs to be considered, and there is no need to additionally consider the influence of overvoltage, so that common components can be selected to complete the function design. Thirdly, the delay circuit does not need to add a diode to prevent reverse current, and the power of the full control voltage level can be controlled below 1W, reducing the energy consumption. In addition, the series scheme avoids the increase of the voltage-dividing resistor caused by the changes of impedance, capacitive reactance, inductive reactance, etc. in parallel, ensuring that the temperature rise of the circuit during pulling-in and holding does not exceed 5K, maintaining the stability of the circuit. Finally, the reduction of power significantly extends the service life of the moving iron core, and further improves the mechanical life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the principle of a control circuit of a dual-coil control electrical appliance provided by an embodiment of this specification; Figure 2 It is a schematic diagram of the principle of the power conditioning module 100 provided by an embodiment of this specification; Figure 3A circuit schematic diagram of a control circuit for a dual - coil control electrical appliance provided by an embodiment of this specification.

[0019] Accompanying drawing illustration: 100, power conditioning module; 200, control module; 300, switching element; 400, voltage - stabilizing element; 500, first coil; 600, second coil. Detailed implementation manners

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0021] The following combines the accompanying Figures 1-3 Describe the exemplary embodiments of the present invention more comprehensively. However, the exemplary embodiments can be implemented in various forms and should not be understood that the present invention is limited to the embodiments described herein. On the contrary, providing these exemplary embodiments can make the present invention more comprehensive and complete, and more convenient to convey the inventive concept to those skilled in the art in an all - round way. Identical reference numerals in the figures represent the same or similar elements, components or parts, and thus their repeated description will be omitted.

[0022] On the premise of conforming to the technical concept of the present invention, the features, structures, characteristics or other details described in a specific embodiment do not exclude being combined in a suitable manner in one or more other embodiments.

[0023] In the description of specific embodiments, the features, structures, characteristics or other details described in the present invention are for those skilled in the art to fully understand the embodiments. However, it does not exclude that those skilled in the art can practice the technical solutions of the present invention without one or more of the specific features, structures, characteristics or other details.

[0024] The flowcharts shown in the accompanying drawings are only illustrative, and do not necessarily include all the contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0025] The block diagrams shown in the accompanying drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices or different types of products.

[0026] The term "and / or" or "and / or" includes all combinations of any one or more of the associated listed items.

[0027] Figure 1 The schematic diagram of the principle of a control circuit for a dual-coil control electrical appliance provided for the embodiments of this specification includes: A varistor R1, a power conditioning module 100, a control module 200, a switching element 300, a voltage stabilizing element 400, a first coil 500, and a second coil 600; The varistor R1 is connected to the power conditioning module 100, the power conditioning module 100 is respectively connected to the control module 200, the first coil 500, and the switching element 300, the first coil 500 is respectively connected to the control module 200, the second coil 600, and the switching element 300, the control module 200 is respectively connected to the first coil 500, the second coil 600, and the switching element 300, the switching element 300 is respectively connected to the first coil 500, the second coil 600, and the voltage stabilizing element 400, and the second coil 600 is connected to the voltage stabilizing element 400.

[0028] In the specific embodiments of this specification, the power conditioning module 100 can achieve voltage conversion through a transformer, thereby outputting a low-voltage and large-current signal, which is suitable for application scenarios that require large-current drive, such as motor control, solenoid valve drive, etc. When the efficiency of the power conditioning module 100 is above 80%, its energy-saving effect is more significant compared to the rectifier circuit design. According to theoretical calculations and experimental verifications, the former can save 0.5W - 2W more energy than the latter, which is particularly obvious for a system running for a long time.

[0029] As Figure 2 shown, the control module 200 includes an electronic delay unit, a control signal processing unit, and an execution drive unit. When a control signal comes in and the circuit is powered on, V1 and V2 are applied to the control module 200, and the electronic delay unit works. When the delay time reaches, the control signal processing unit works and outputs a hold signal to the execution drive unit, and the execution drive unit drives the switching element 300 to disconnect, achieving the purpose of controlling the suction hold switchover.

[0030] Optionally, it includes: The input 1 and input 2 of the control electrical appliance obtain the closing signal, the first coil 500 operates, the switching element conducts, and the control electrical appliance is attracted, so as to ensure the ampere-turns during attraction; until the control electrical appliance is fully attracted, the control module 200 controls the switching element 300 to disconnect, the second coil 600 operates, and parameter conditioning is performed through the voltage stabilizing element 400 to ensure the ampere-turns during holding.

[0031] In the specific embodiment of this specification, the first coil 500 is a thick coil with a large number of turns and a small wire cross-section, so it can maintain the attracted state of the control electrical appliance at a lower current. The second coil 600 is a thin coil with a large number of turns and a small wire cross-section, so it can maintain the attracted state of the control electrical appliance at a lower current.

[0032] The input 1 and input 2 of the control electrical appliance receive the closing signal, the first coil 500 starts to operate, generates a magnetic force to attract the moving iron core of the control electrical appliance, the switching element 300 conducts, allowing current to flow through the first coil 500 into the control electrical appliance, accelerating the attraction process. The control module 200 monitors the state of the control electrical appliance and waits for it to be fully attracted. Once the control electrical appliance is fully attracted, the control module 200 issues an instruction to disconnect the switching element 300. The second coil 600 starts to operate to maintain the attracted state of the control electrical appliance. The voltage stabilizing element 400 adjusts the circuit parameters to ensure that the second coil 600 can obtain stable current and voltage during holding. The control electrical appliance remains in the attracted state with low power consumption, achieving an energy-saving effect. That is, through reasonable coil selection and switch control, rapid attraction and low-power holding of the control electrical appliance are achieved.

[0033] Optionally, the power conditioning module 100 includes diodes D1, D2, D3, D4. The positive electrode of diode D1 is connected to the negative electrode of diode D2 and the varistor R1 respectively. The negative electrode of diode D1 is connected to the negative electrode of diode D4, the control module 200, the first coil 500, and the varistor R1 respectively. The negative electrode of diode D4 is connected to the control module 200 and the first coil 500 respectively. The positive electrode of diode D4 is connected to the negative electrode of diode D3 and the varistor R1 respectively. The negative electrode of diode D3 is connected to the varistor R1, and the positive electrode of diode D3 is connected to the positive electrode of diode D2.

[0034] Optionally, the control module 200 includes: a resistor R6 connected to the negative electrode of the diode D1 and the positive electrode of the diode D4. The resistor R6 is respectively connected to a resistor R7, the negative electrode of a Zener diode D21. The resistor R7 is connected to a resistor R10, the first coil 500, the emitter of a triode Q5, a capacitor C6, the negative electrode of a Zener diode D24, and a switching element 300. The negative electrode of the Zener diode D21 is respectively connected to the positive electrode of a polarized capacitor C3 and a resistor R3. The negative electrode of the polarized capacitor C3 is connected to a resistor R2. The resistor R2 is connected to the resistor R3 and a polarized capacitor C2. The emitter of the triode Q5 is connected to the capacitor C6, the negative electrode of the Zener diode D24, and the switching element 300. The base of the triode Q5 is respectively connected to the resistor R10 and the collector of a triode Q4. The collector of the triode Q5 is connected to the base of the triode Q4. The emitter of the triode Q4 is grounded.

[0035] Optionally, the switching element 300 includes a mechanical switch, a MOS transistor, and a relay.

[0036] In the specific embodiments of this specification, when the switching element 300 is controlled by the control module 200 to be turned off, the control electrical appliance is at this time changing its working state from the suction state to the holding state. At this moment, when M4 is suddenly disconnected and a thin coil is instantaneously introduced, a break voltage will be generated at one end M4 of the thick coil. When the control voltage is below a lower voltage (such as about 100V), the break voltage is relatively large, 1 - 5 times the rated voltage. When the control voltage is higher, due to the increase in the number of turns of the thick coil and the thin coil, the break voltage of M4 is below the rated voltage of the circuit, and there is no overvoltage.

[0037] Optionally, the switching element 300 includes a MOS transistor Q6. The gate of the MOS transistor Q6 is connected to the negative electrode of the Zener diode D24. The drain of the MOS transistor Q6 is respectively connected to the first coil 500 and the second coil 600. The source of the MOS transistor Q6 is grounded.

[0038] Optionally, the voltage stabilizing element 400 includes a Zener diode D25. The negative electrode of the Zener diode D25 is connected to the second coil 600. The positive electrode of the Zener diode D25 is grounded.

[0039] In the specific embodiments of this specification, as Figure 3 shown, the voltage stabilizing element 400 is connected in series between the thick coil and the thin coil, playing a role of voltage clamping and voltage division. It can regulate the energization voltages M1 and M3 of the thick coil and the thin coil to ensure that they can stably operate on the holding characteristic curve. The presence of the voltage stabilizing element 400 can also reduce the active power consumption and reactive power consumption to a certain extent.

[0040] In the present invention, first, the pulling-in coil can also serve as the holding coil, effectively reducing the number of coil turns and simplifying the design. Second, there is no need to install a bidirectional choke diode inside the DC coil. The overvoltage increase during MOS tube cut-off is limited, and experiments have shown that the overvoltage above 110V is still within the rated voltage range, effectively eliminating the overvoltage phenomenon. When selecting a MOS tube, only the rated voltage parameter needs to be considered, and the influence of overvoltage does not need to be considered additionally. Therefore, commonly used components can be selected to complete the function design. Moreover, the delay circuit does not need to add a diode to prevent reverse current, and the power of the full control voltage level can be controlled below 1W, reducing the energy consumption. In addition, the series connection scheme avoids the increase of the voltage-dividing resistor caused by changes in impedance, capacitive reactance, inductive reactance, etc. during parallel connection, ensuring that the circuit temperature rise during pulling-in and holding does not exceed 5K and maintaining the stability of the circuit. Finally, the reduction of power significantly extends the life of the moving iron core, and thus improves the mechanical life of the product.

[0041] In summary, the present invention can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that general-purpose data processing devices such as microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components according to the embodiments of the present invention. The present invention can also be implemented as a device or device program (such as a computer program and a computer program product) for executing part or all of the methods described herein. Such a program for implementing the present invention can be stored on a computer-readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0042] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the present invention is not inherently related to any specific computer, virtual device, or electronic device, and various general-purpose devices can also implement the present invention. The above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0043] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0044] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A control circuit for a double-coil control electrical appliance, characterized in that, Including: A varistor R1, a power conditioning module (100), a control module (200), a switching element (300), a voltage stabilizing element (400), a first coil (500), and a second coil (600); The varistor R1 is connected to the power conditioning module (100), the power conditioning module (100) is respectively connected to the control module (200), the first coil (500), and the switching element (300), the first coil (500) is respectively connected to the control module (200), the second coil (600), and the switching element (300), the control module (200) is respectively connected to the first coil (500), the second coil (600), and the switching element (300), the switching element (300) is respectively connected to the first coil (500), the second coil (600), and the voltage stabilizing element (400), and the second coil (600) is connected to the voltage stabilizing element (400).

2. The control circuit of the double-coil control electrical appliance according to claim 1, characterized in that, Including: The inputs 1 and 2 of the control electrical appliance obtain a closing signal, the first coil (500) operates, the switching element conducts, and the control electrical appliance is attracted, so as to ensure the ampere-turns during attraction; until the control electrical appliance is fully attracted, the control module (200) controls the switching element (300) to disconnect, the second coil (600) operates, and parameter conditioning is performed through the voltage stabilizing element (400) to ensure the ampere-turns during holding.

3. The control circuit of the double-coil control electrical appliance according to claim 2, characterized in that, The power conditioning module (100) includes diodes D1, D2, D3, and D4. The positive electrode of diode D1 is respectively connected to the negative electrode of diode D2 and the varistor R1. The negative electrode of diode D1 is respectively connected to the negative electrode of diode D4, the control module (200), the first coil (500), and the varistor R1. The negative electrode of diode D4 is respectively connected to the control module (200) and the first coil (500). The positive electrode of diode D4 is respectively connected to the negative electrode of diode D3 and the varistor R1. The negative electrode of diode D3 is connected to the varistor R1, and the positive electrode of diode D3 is connected to the positive electrode of diode D2.

4. The control circuit of the double-coil control electrical appliance according to claim 3, characterized in that, The control module (200) includes: a resistor R6 connected to the negative electrode of diode D1 and the positive electrode of diode D4. Resistor R6 is respectively connected to resistor R7 and the negative electrode of Zener diode D21. Resistor R7 is connected to resistor R10, the first coil (500), the emitter of transistor Q5, capacitor C6, the negative electrode of Zener diode D24, and the switching element (300). The negative electrode of Zener diode D21 is respectively connected to the positive electrode of polarized capacitor C3 and resistor R3. The negative electrode of polarized capacitor C3 is connected to resistor R2. Resistor R2 is connected to resistor R3 and polarized capacitor C2; The emitter of the triode Q5 is connected to the capacitor C6, the negative electrode of the Zener diode D24, and the switching element (300). The base of the triode Q5 is respectively connected to the resistor R10 and the collector of the triode Q4. The collector of the triode Q5 is connected to the base of the triode Q4. The emitter of the triode Q4 is grounded.

5. The control circuit of the double-coil control electrical appliance according to claim 4, characterized in that, The switching element (300) includes a mechanical switch, a MOS transistor, and a relay.

6. The control circuit of the double-coil control electrical appliance according to claim 5, characterized in that, The switching element (300) includes a MOS transistor Q6. The gate of the MOS transistor Q6 is connected to the negative electrode of the Zener diode D24. The drain of the MOS transistor Q6 is respectively connected to the first coil (500) and the second coil (600). The source of the MOS transistor Q6 is grounded.

7. The control circuit of the double-coil control electrical appliance according to claim 6, characterized in that, The voltage stabilizing element (400) includes a Zener diode D25. The negative electrode of the Zener diode D25 is connected to the second coil (600). The positive electrode of the Zener diode D25 is grounded.

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