Energy-saving operation control circuit of double-coil direct current contactor
By using RC delay control circuit, current limiting resistor, switching device, isolation diode, starting coil freewheeling circuit and maintaining coil freewheeling circuit in the double coil DC electromagnetic contactor control circuit, the problem of excessive contactor release time and The problem of circuit oscillation is eliminated, and the control effect of quick release and high reliability is achieved.
Patent Information
- Application Number
- CN202420510710.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-16
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-03-16
AI Technical Summary
The existing dual-coil DC electromagnetic contactor control circuit has a long release time at the moment of disconnection, and the response speed is slow, and it is easy to cause circuit oscillation and jump back, affecting the contact life and the normal operation of other circuits.
RC delay control circuit, current limiting resistor, switching device, isolation diode, starting coil freewheeling circuit and sustaining coil freewheeling circuit are used. Through the combination of these circuit components, effective control and freewheeling of the starting coil and sustaining coil are achieved. Ensure quick release and stable operation of the contactor.
By quickly absorbing the reverse peak voltage, the release time of the contactor is shortened, the vibration and rebound of the contact are reduced, the reliability and safety of the control circuit are improved, and the manufacturing cost is reduced.
Smart Images
Figure CN222380493U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of contactors, and more specifically to an energy-saving operation control circuit of a double-coil DC contactor. Background Art
[0002] A dual-coil DC electromagnetic contactor is an electromagnetic switching device driven by a DC power supply, with two coils, usually a starting (or attraction) coil and a holding (or maintenance) coil. In the contactor, these two coils work together to ensure reliable switching action and stability of the electrical system.
[0003] The core components of a dual-coil DC electromagnetic contactor are its coil and contact system. The starting coil generates a magnetic field after power is applied, causing the iron core to move and drive the contacts to close, thereby connecting the load circuit; while the holding coil plays a role in keeping the contact position closed after the coil is powered off, ensuring that the circuit remains stable in the closed state.
[0004] In practical applications, the dual-coil DC electromagnetic contactor has significant advantages in energy saving and power saving, and can greatly reduce the temperature rise of the coil during operation. Due to its DC power drive characteristics, it can provide a more stable, reliable and noise-free working state for the electrical system. In addition, the dual-coil design allows remote control and automated operation, improving work efficiency and system reliability.
[0005] The dual-coil DC electromagnetic contactor control circuit in the prior art generally adopts a single diode for freewheeling, which leads to a long release time and slow response speed; there are also multiple TVS transient suppression diodes used in combination, which can only block the reverse peak voltage, but cannot effectively absorb the reverse peak voltage, which is easy to cause circuit oscillation and rebound, interfere with peripheral electrical equipment and its own contact jitter; TVS tubes are not as reliable as ordinary rectifier diodes; and the price of TVS tubes is several times that of ordinary rectifier diodes. In addition, due to the slow release of this type of control circuit, there is also the problem of too long spark time generated at the moment of disconnection. When the contacts are disconnected, the longer the spark lasts, the easier it is to corrode the contacts, shorten the service life of the contacts, and affect the normal operation of other circuits. Especially in the case of high voltage and high current, the harm of electric sparks is more obvious. Utility Model Content
[0006] In view of the above-mentioned defects of the prior art, on the one hand, the utility model provides a high-reliability, low-cost double-coil DC contactor energy-saving operation control circuit, comprising:
[0007] RC delay control circuit, current limiting resistor, switch device, isolation diode, start coil freewheeling circuit, maintenance coil freewheeling circuit, double coil contactor, the double coil contactor includes a start coil and a maintenance coil, the RC delay control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switch device, the switch device is connected to the start coil, the start coil is connected to the start coil freewheeling circuit, and the maintenance coil is connected to the maintenance coil freewheeling circuit; the RC delay control circuit is used for turning on and off the switch device; the current limiting resistor is used to reduce the voltage impact on the switch device; the switch device is used to control the opening and closing of the start coil; the start coil freewheeling circuit is used to provide the start coil freewheeling loop to absorb the high voltage reverse peak voltage generated by the start coil when the switch device is closed; the maintenance coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and bounce time of the contacts.
[0008] Preferably, the RC delay control circuit comprises: a capacitor C and a resistor R1 connected in series.
[0009] Preferably, the switching device is a field effect transistor.
[0010] Preferably, the switching device is an insulated gate bipolar transistor (IGBT).
[0011] Preferably, the switching device is a bipolar transistor.
[0012] Preferably, the starting coil freewheeling circuit comprises: a diode D3 and a resistor R4 connected in series.
[0013] Preferably, the sustaining coil freewheeling circuit comprises: a diode D2 and a resistor R3 connected in series.
[0014] Preferably, the isolation device is a diode D1.
[0015] On the other hand, the utility model also provides a high-reliability, low-cost double-coil DC contactor energy-saving operation control circuit, comprising:
[0016] A timing control circuit, a current limiting resistor, a switching device, an isolation diode, a starting coil freewheeling circuit, a maintaining coil freewheeling circuit, and a double-coil contactor, wherein the double-coil contactor includes a starting coil and a maintaining coil, the timing control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switching device, the switching device is connected to the starting coil, the starting coil is connected to the starting coil freewheeling circuit, and the maintaining coil is connected to the maintaining coil freewheeling circuit; the timing control circuit is used for turning on and off the switching device; the current limiting resistor is used to reduce the voltage impact on the switching device; the switching device is used to control the opening and closing of the starting coil; the starting coil freewheeling circuit is used to provide the starting coil freewheeling loop to absorb the high-voltage reverse peak voltage generated by the starting coil when the switching device is closed; the maintaining coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and bounce time of the contacts.
[0017] The energy-saving operation control circuit of the double-coil DC contactor of the utility model has the following beneficial effects: by setting an RC delay control circuit, a current limiting resistor, a switch device, an isolation diode, a start coil freewheeling circuit, a maintenance coil freewheeling circuit, and a double-coil contactor, the double-coil contactor includes a start coil and a maintenance coil, the RC delay control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switch device, the switch device is connected to the start coil, the start coil is connected to the start coil freewheeling circuit, and the maintenance coil is connected to the maintenance coil freewheeling circuit; the RC delay control circuit is used for turning on and off the switch device; the current limiting resistor is used to reduce the voltage impact on the switch device; the switch device is used to control the opening and closing of the start coil; the start coil freewheeling circuit is used to provide a start coil freewheeling circuit to absorb the high-voltage reverse peak current generated by the start coil when the switch device is closed. pressure; the holding coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and bounce time of the contacts; a resistor is connected in series in the commonly used diode freewheeling circuit to absorb the high voltage electric energy generated when the contactor is released and shorten the release time, so that the reverse peak voltage can be effectively and quickly absorbed, protect the control circuit and the contactor's own safety, improve reliability, and reduce the manufacturing cost of the control circuit; adding an isolation diode D1 between the switching device and the negative power supply can make the reverse peak voltage generated when the holding coil is powered off only enter the holding coil freewheeling circuit and be effectively absorbed; the timing control circuit can also be used to replace the RC delay control circuit to realize the function of the RC delay control circuit, which can be widely used in energy-saving operation devices of double-coil DC electromagnetic contactors. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. The utility model will be further described below in combination with the drawings and embodiments. In the drawings:
[0019] Figure 1 This is the principle block diagram of the energy-saving operation control circuit of the double-coil DC contactor of the utility model;
[0020] Figure 2 This is a schematic structural diagram of a preferred embodiment of the energy-saving operation control circuit of a double-coil DC contactor of the utility model;
[0021] Figure 3 This is a schematic structural diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model;
[0022] Figure 4 This is a schematic structural diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model;
[0023] Figure 5 This is a schematic structural diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model;
[0024] Figure 6 This is a schematic structural diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model;
[0025] Figure 7 It is a structural schematic diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model. Example
[0029] See also Figure 1 , Figure 2 , is the principle block diagram of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 1 and Figure 2 As shown, in the energy-saving operation control circuit of the dual-coil DC contactor provided in the first embodiment of the utility model, at least: an RC delay control circuit, a current limiting resistor, a switching device, an isolation diode, a starting coil freewheeling circuit, a maintaining coil freewheeling circuit, and a dual-coil contactor. The dual-coil contactor includes a starting coil and a maintaining coil. The RC delay control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switching device, the switching device is connected to the starting coil, the starting coil is connected to the starting coil freewheeling circuit, and the maintaining coil is connected to the maintaining coil freewheeling circuit; the RC delay control circuit is used for turning on and off the switching device; the current limiting resistor is used to reduce the voltage impact on the switching device; the switching device is used to control the opening and closing of the starting coil; the starting coil freewheeling circuit is used to provide a starting coil freewheeling circuit to absorb the high-voltage reverse peak voltage generated by the starting coil when the switching device is closed; the maintaining coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and rebound time of the contacts. The isolation diode D1 is an isolation device provided to prevent the reverse peak voltage generated by the coil from being short-circuited by the switch device M when the contactor is released, forcing the reverse peak current to flow to the freewheeling absorption circuit, so that the reverse peak voltage can be absorbed quickly and effectively.
[0030] The working principle of the double-coil DC electromagnetic contactor is to rely on the current to generate an electromagnetic field in the coil, and the electromagnetic force is used to attract the contactor armature and drive the contacts to close.
[0031] The main function of the RC delay control circuit is to control the delayed closing of the switching device so that the contactor's suction coil can stop working in time and complete the startup process.
[0032] The RC delay control circuit can set different device parameters as needed to obtain the required delay time, thereby achieving control requirements in different scenarios.
[0033] In a specific implementation, the RC delay control circuit may include: a capacitor C and a resistor R1 connected in series.
[0034] In the double-coil DC electromagnetic contactor control circuit, the contactor consists of two coils, namely the starting coil and the maintaining coil. When current passes through the coils, a magnetic field is generated, which attracts the iron core to move and drives the contacts to close, thereby connecting the external circuit.
[0035] The main function of the current limiting resistor is to protect the switching device from voltage surges by limiting the current.
[0036] In the control circuit of the dual-coil DC electromagnetic contactor, the switch device plays a vital role. First, as the control core of the entire circuit, the switch device is responsible for connecting the power supply of the starting coil to realize the startup control of the circuit. During the startup process, the switch device connects the contactor starting coil to the power supply, generates a magnetic field attraction force, closes the contacts, and thus connects the external load power supply to drive the equipment to operate.
[0037] The switch device in the double-coil DC electromagnetic contactor control circuit is not only related to the normal startup of the equipment, but also has an important impact on the safety and life of the equipment.
[0038] In a specific implementation, the switch device may be, but is not limited to, a field effect transistor, an insulated gate bipolar transistor IGBT, a bipolar transistor, and the like.
[0039] When the contactor is started, the starting coil is energized to generate a magnetic field, driving the armature to attract, thereby driving the contacts to close. However, when the start-up is completed and the starting coil is powered off, if there is no corresponding freewheeling measure in the circuit, the reverse electromotive force generated by the coil will have nowhere to be released. This reverse electromotive force may cause the coil and switch components to break down, be damaged, or interfere with the normal operation of the circuit, and even damage the contactor. Therefore, the function of the starting coil freewheeling circuit is to absorb the reverse electromotive force generated when the coil is powered off. Through the freewheeling circuit, the reverse electromotive force is absorbed to protect the contactor coil and switch components, and the reliability of the circuit is improved, and electromagnetic interference is reduced.
[0040] In a specific implementation, the starter coil freewheeling circuit includes: a diode D3 and a resistor R4 connected in series.
[0041] In the control circuit of the dual-coil DC electromagnetic contactor, the maintenance coil freewheeling circuit is mainly responsible for absorbing the reverse peak voltage for the maintenance coil when the contactor is released. When the contactor is released, the maintenance coil freewheeling circuit can quickly absorb the reverse peak voltage to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration of the contacts. In the control circuit of the dual-coil DC electromagnetic contactor, the maintenance coil freewheeling circuit can improve the performance and reliability of the contactor and ensure the safe and reliable operation of the system. Therefore, when designing and applying the dual-coil DC electromagnetic contactor, the role of the maintenance coil freewheeling circuit should be fully considered to ensure the normal operation of the system.
[0042] The coil freewheeling circuit includes a diode D2 and a resistor R3 connected in series.
[0043] The double coil contactor is energy-saving and environmentally friendly. During operation, only a small current is needed to keep the contactor in the closed state, which effectively reduces energy consumption and waste heat generation, and conforms to the modern green environmental protection concept. The double coil DC electromagnetic contactor plays an important role in the control circuit. It can not only achieve precise control, but also has high stability and reliability. At the same time, it has the characteristics of energy saving and environmental protection. It is an indispensable and important component in the modern electrical control system.
[0044] Figure 2 This is a schematic diagram of a preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 2 As shown, the switch device M is explained by taking the field effect tube as an example. Capacitor C and resistor R1 form an RC delay control circuit; resistor R2 is a current limiting resistor; switch device M is a field effect tube, which controls the start coil to be turned on and off; diode D1 is an isolation diode of switch device M, diode D3 and resistor R4 form a start coil freewheeling circuit, and diode D2 and resistor R3 form a maintenance coil freewheeling circuit. At the moment of power-on, because the voltage across capacitor C cannot change suddenly, the voltage at the upper end of resistor R1 is close to the power supply voltage. The voltage after current limiting by resistor R2 is much greater than the opening condition of switch device M. Switch device M is turned on, the start coil is energized, and the contactor is attracted. At the same time as power is turned on, the maintenance coil is also energized, and the two sets of coils work at the same time; as capacitor C and resistor R1 are charged for a delay, the voltage at the upper end of resistor R1 gradually decreases. When the voltage through resistor R2 drops to a level that is insufficient to support the switch device M to be turned on, the switch device M is turned off, the start coil is powered off and exits work, and the start process ends. At this time, only the maintenance coil is working, and the contactor remains continuously attracted with a smaller current, thus achieving the purpose of energy-saving operation.
[0045] Because the contactor coil is an inductive device, a reverse high voltage (reverse electromotive force, also known as reverse peak voltage) will be generated when the power is off. If no measures are taken, the circuit or the coil itself will be damaged. In response to this phenomenon, a freewheeling diode is usually connected in parallel at both ends of the contactor coil to eliminate the reverse peak voltage. However, a single freewheeling diode will prolong the release time of the contactor and cannot meet the short-time release requirements. In order to shorten the release time, this circuit connects resistors R3 and R4 in series in the freewheeling diode circuits of the two coils respectively, so as to achieve the dual purpose of quickly absorbing the reverse peak energy and shortening the release time. Diode D1 is an isolation device set to maintain the reverse peak voltage generated by the coil from being short-circuited by the switching device M when the contactor is released, forcing the reverse peak current to flow to the freewheeling absorption circuit, so that the reverse peak voltage can be quickly and effectively absorbed.
[0046] Figure 3 It is a structural schematic diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 4 It is a structural schematic diagram of another preferred embodiment of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 5 This is another preferred embodiment of the structure schematic diagram of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 3 , Figure 4 , Figure 5 As shown, Figure 2 By comparison, the connection mode of the diode D2 and the resistor R3 is changed, and the connection mode of the diode D3 and the resistor R4 is changed, and the working principle is the same. The switch device M can be, but is not limited to, a field effect transistor, a bipolar transistor, an insulated gate bipolar transistor IGBT, a triode, etc.
[0047] Figure 6 This is another preferred embodiment of the structure schematic diagram of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 6 As shown, the switching device M is selected as a transistor.
[0048] Figure 7 This is another preferred embodiment of the structure schematic diagram of the energy-saving operation control circuit of the double-coil DC contactor of the utility model. Figure 7 As shown, the switch device M is selected as an insulated gate bipolar transistor (IGBT type transistor). Example
[0049] In the energy-saving operation control circuit of the double-coil DC contactor provided in the first embodiment of the utility model, at least: a timing control circuit, a current limiting resistor, a switching device, an isolation diode, a starting coil freewheeling circuit, a maintaining coil freewheeling circuit, and a double-coil contactor, wherein the double-coil contactor comprises a starting coil and a maintaining coil, the timing control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switching device, the switching device is connected to the starting coil, the starting coil is connected to the starting coil freewheeling circuit, and the maintaining coil is connected to the maintaining coil freewheeling circuit; the timing control circuit is used for turning on and off the switching device; the current limiting resistor is used to reduce the voltage impact on the switching device; the switching device is used to control the opening and closing of the starting coil; the starting coil freewheeling circuit is used to provide the starting coil freewheeling circuit to absorb the high-voltage reverse peak voltage generated by the starting coil when the switching device is closed; the maintaining coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and rebound time of the contacts.
[0050] Compared with the first embodiment, the RC delay control circuit is replaced by a timing control circuit. The timing control circuit includes a clock source, a frequency divider, a timing generator, a counter and a register connected electrically. The timing control circuit is responsible for coordinating the clock source, the frequency divider, the timing generator, the counter and the register to work in a certain time sequence to ensure that the system operates stably and efficiently. The clock source is the working reference of the entire timing control circuit, providing a stable clock signal to ensure that various components such as the frequency divider, the timing generator, the counter and the register work synchronously. The clock source can be a crystal oscillator, an external clock signal, etc. The frequency divider is used to reduce the frequency of the clock source to a frequency suitable for the timing generator, the counter and the register to work. The frequency divider is implemented by an internal counter and a logic gate circuit, and can convert a high-frequency clock signal into a low-frequency stable clock signal. The timing generator is the core component of the timing control circuit. The timing generator generates various control signals, such as a start signal, a stop signal, a reset signal, etc., according to the preset timing requirements. These control signals are implemented by internal logic gate circuits and registers, and can accurately control the working timing of other components. The timing control circuit is used to record the number of pulses of the clock signal to achieve timing or counting functions. The counter can be a binary counter, a decimal counter, etc., and different types can be selected according to needs. The register is used to store the status of the control signal and the intermediate results. The register can be a trigger, a latch, etc., which can keep the data stable and provide it to other components when needed.
[0051] The energy-saving operation control circuit of the double-coil DC contactor of the utility model has the following beneficial effects: by setting an RC delay control circuit, a current limiting resistor, a switch device, an isolation diode, a start coil freewheeling circuit, a maintenance coil freewheeling circuit, and a double-coil contactor, the double-coil contactor includes a start coil and a maintenance coil, the RC delay control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switch device, the switch device is connected to the start coil, the start coil is connected to the start coil freewheeling circuit, and the maintenance coil is connected to the maintenance coil freewheeling circuit; the RC delay control circuit is used for turning on and off the switch device; the current limiting resistor is used to reduce the voltage impact on the switch device; the switch device is used to control the opening and closing of the start coil; the start coil freewheeling circuit is used to provide a start coil freewheeling circuit to absorb the high-voltage reverse peak current generated by the start coil when the switch device is closed. pressure; the holding coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and bounce time of the contacts; a resistor is connected in series in the commonly used diode freewheeling circuit to absorb the high voltage electric energy generated when the contactor is released and shorten the release time, so that the reverse peak voltage can be effectively and quickly absorbed, protect the control circuit and the contactor's own safety, improve reliability, and reduce the manufacturing cost of the control circuit; adding an isolation diode D1 between the switching device and the negative power supply can make the reverse peak voltage generated when the holding coil is powered off only enter the holding coil freewheeling circuit and be effectively absorbed; the timing control circuit can also be used to replace the RC delay control circuit to realize the function of the RC delay control circuit, which can be widely used in energy-saving operation devices of double-coil DC electromagnetic contactors.
[0052] The present invention is described according to specific embodiments, but those skilled in the art should understand that various changes and equivalent substitutions can be made without departing from the scope of the present invention. For example, other timing control circuits can be used to replace the RC loop. In addition, in order to adapt to specific occasions of the present invention technology, many modifications can be made to the present invention without departing from its protection scope. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all embodiments that fall within the scope of protection of the claims.
Claims
1. A dual-coil DC contactor energy-saving operation control circuit, characterized in that: include: RC delay control circuit, current limiting resistor, switch device, isolation diode, start coil freewheeling circuit, maintenance coil freewheeling circuit, double coil contactor, the double coil contactor includes a start coil and a maintenance coil, the RC delay control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switch device, the switch device is connected to the start coil, the start coil is connected to the start coil freewheeling circuit, and the maintenance coil is connected to the maintenance coil freewheeling circuit; the RC delay control circuit is used for turning on and off the switch device; the current limiting resistor is used to reduce the voltage impact on the switch device; the switch device is used to control the opening and closing of the start coil; the start coil freewheeling circuit is used to provide the start coil freewheeling loop to absorb the high voltage reverse peak voltage generated by the start coil when the switch device is closed; the maintenance coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and bounce time of the contacts.
2. The energy-saving operation control circuit of the double-coil DC contactor according to claim 1 is characterized in that: The RC delay control circuit includes: a capacitor C and a resistor R1 connected in series.
3. The energy-saving operation control circuit of the double-coil DC contactor according to claim 1 is characterized in that: The switch device is a field effect transistor.
4. The energy-saving operation control circuit of the double-coil DC contactor according to claim 1 is characterized in that: The switching device is an insulated gate bipolar transistor IGBT.
5. The energy-saving operation control circuit of the double-coil DC contactor according to claim 1 is characterized in that: The switch device is a bipolar transistor.
6. The energy-saving operation control circuit of the double-coil DC contactor according to claim 1 is characterized in that: The starting coil freewheeling circuit includes a diode D3 and a resistor R4 connected in series.
7. The energy-saving operation control circuit of a dual-coil DC contactor according to any one of claims 1 to 6, characterized in that: The sustaining coil freewheeling circuit comprises a diode D2 and a resistor R3 connected in series.
8. A dual-coil DC contactor energy-saving operation control circuit, characterized in that: include: A timing control circuit, a current limiting resistor, a switching device, an isolation diode, a starting coil freewheeling circuit, a maintaining coil freewheeling circuit, and a double-coil contactor, wherein the double-coil contactor includes a starting coil and a maintaining coil, the timing control circuit is connected to the current limiting resistor, the current limiting resistor is connected to the switching device, the switching device is connected to the starting coil, the starting coil is connected to the starting coil freewheeling circuit, and the maintaining coil is connected to the maintaining coil freewheeling circuit; the timing control circuit is used for turning on and off the switching device; the current limiting resistor is used to reduce the voltage impact on the switching device; the switching device is used to control the opening and closing of the starting coil; the starting coil freewheeling circuit is used to provide the starting coil freewheeling loop to absorb the high-voltage reverse peak voltage generated by the starting coil when the switching device is closed; the maintaining coil freewheeling circuit is used to absorb the reverse peak voltage generated by the holding coil when the contactor is released to compensate for the hysteresis of the coil, ensure that the contactor can be released smoothly and quickly, and reduce the vibration and bounce time of the contacts.