Single-coil relay control circuit, relay and automation system
By designing a single-coil relay control circuit including voltage input module, resistance-capacitance delay module and coil freewheeling module, the problem of insufficient relay operation response time is solved, and faster operation response and stronger impact resistance are achieved. Vibration performance.
Patent Information
- Application Number
- CN202411851112.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-02-18
AI Technical Summary
Single coil relays fail to achieve faster action response times when contacts are closed, resulting in reduced impact and vibration resistance in some application environments.
A single-coil relay control circuit is designed, including a voltage input module, a resistance-capacitance delay module and a coil freewheeling module. The internal MOS tube is quickly turned on through the resistor-capacitance delay module, which shortens the operating time of the relay contacts, and switches the low-voltage power supply in the power conversion module after the delay is over, improving the impact and vibration performance of the relay.
It realizes faster action response of relay contacts and improves its impact and vibration resistance, meeting higher response needs and stronger environmental adaptability.
Smart Images
Figure CN119480544A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of circuit technology, and in particular to a single-coil relay control circuit, a relay and an automation system. Background Art
[0002] When using PWM or dual voltage to drive the relay, the coil operates at the rated working voltage during the contact closure stage. During the holding stage after the contact closure, the coil operates at a reduced duty cycle or below the rated working voltage. During the stage of continuous closure, the coil operates at undervoltage. In some specific application environments, during the holding stage, in the above two applications, after the contact closure is completed, the closing pressure of the relay contacts may be reduced, causing the product's resistance to shock and vibration environments to weaken.
[0003] When the contacts are in action, the driving voltage is a fixed rated working voltage value. When the contacts are in the closing process, the action time of the relay is certain, which cannot meet the requirements of shorter relay contact action time and higher product contact action response. Summary of the invention
[0004] The purpose of this application is to provide a single-coil relay control circuit, a relay and an automation system, aiming to solve the technical problem that a single-coil relay cannot achieve a faster action response time when the coil is electrically closed.
[0005] To achieve the above object, the present application proposes a single-coil relay control circuit, the single-coil relay control circuit comprising:
[0006] Voltage input module, RC delay module and coil freewheeling module;
[0007] The voltage input module is respectively connected to the first end of the RC delay module and the first end of the coil freewheeling module; the second end of the RC delay module is connected to the second end of the coil freewheeling module;
[0008] The voltage input module is used to generate a first driving signal and transmit it to the RC delay module;
[0009] The RC delay module is used to receive the first driving signal and obtain the second driving signal by delay;
[0010] The coil freewheeling module is used to drive the coil according to the voltage doubling of the second driving signal.
[0011] In one embodiment, the single-coil relay control circuit further includes: a power conversion module;
[0012] The first end of the power conversion module is connected to the third end of the RC delay module; the second end of the power conversion module is connected to the second end of the coil freewheeling module;
[0013] The power conversion module is used to output a third drive signal to the coil freewheeling module when the second drive signal stops being generated;
[0014] The coil freewheeling module is further used to drive the coil at a normal voltage according to the third driving signal.
[0015] In one embodiment, the RC delay module includes: a delay unit and a driving unit;
[0016] The first end of the delay unit is connected to the voltage input module; the second end of the delay unit is connected to the first end of the drive unit; the third end of the delay unit is connected to the second end of the coil freewheeling module;
[0017] The second end of the driving unit is connected to the voltage input module; the third end of the driving unit is connected to the second end of the coil freewheeling module;
[0018] The delay unit is used to extend the generation time of the second driving signal;
[0019] The driving unit is used to transmit the second driving signal to the coil freewheeling module.
[0020] In one embodiment, the delay unit includes: a first resistor, a second resistor and a first capacitor;
[0021] The first end of the first resistor is connected to the voltage input module, the first end of the power conversion module and the third end of the driving unit; the second end of the first resistor is connected to the first end of the second resistor and the first end of the first capacitor;
[0022] The second end of the second resistor is connected to the first end of the driving unit;
[0023] The second end of the first capacitor is connected to the second end of the driving unit.
[0024] In one embodiment, the driving unit includes: a first MOS tube;
[0025] The gate of the first MOS tube is connected to the second end of the second resistor;
[0026] The drain of the first MOS tube is connected to the second end of the first capacitor;
[0027] The source of the first MOS tube is connected to the voltage input module and the first end of the power conversion module.
[0028] In one embodiment, the coil freewheeling module includes: a first diode and a Zener diode;
[0029] The cathode of the first diode is connected to the cathode of the Zener diode; the anode of the first diode is connected to the voltage input module;
[0030] The anode of the Zener diode is connected to the second end of the RC delay module.
[0031] In one embodiment, the voltage input module includes: a second diode and a voltage regulator diode;
[0032] The anode of the second diode is connected to an external power supply; the cathode of the second diode is connected to the first end of the voltage stabilizing diode and the first end of the RC delay module;
[0033] The second end of the voltage stabilizing diode is grounded.
[0034] In one embodiment, the single-coil relay control circuit further comprises: a filter capacitor;
[0035] The first end of the filter capacitor is connected to the RC delay module and the power conversion module;
[0036] The second end of the filter capacitor is grounded.
[0037] In addition, to achieve the above purpose, the present application also proposes a relay, the relay comprising the single-coil relay control circuit as described above
[0038] In addition, to achieve the above objectives, the present application also proposes an automation system, which includes the single-coil relay control circuit as described above.
[0039] The technical solution of the present application proposes a single-coil relay control circuit, which includes: a voltage input module, a RC delay module and a coil freewheeling module; the voltage input module is respectively connected to the first end of the RC delay module and the first end of the coil freewheeling module; the second end of the RC delay module is connected to the second end of the coil freewheeling module; the voltage input module is used to generate a first drive signal and transmit it to the RC delay module; the RC delay module is used to receive the first drive signal and delay to obtain a second drive signal; the coil freewheeling module is used to drive the coil according to the second drive signal. The internal MOS tube is quickly turned on by the RC delay module to shorten the action time of the relay contact, and the low voltage in the power conversion module is switched to power the relay after the delay by the RC delay module, which not only enables the relay to achieve faster action response, but also improves its performance in resisting impact and vibration. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Figure 1 This is a module schematic diagram of the first embodiment of the single-coil relay control circuit proposed in this application;
[0041] Figure 2 A module schematic diagram of a second embodiment of a single-coil relay control circuit proposed in this application;
[0042] Figure 3 This is a circuit connection diagram of the third embodiment of the single-coil relay control circuit proposed in this application.
[0043] Description of Figure Numbers:
[0044] Label name Label name 100 Voltage Input Module D1~D2 First to second diode 200 RC Delay Module R1~R2 First to second resistor 300 Coil freewheeling module C1 First capacitor 400 Power conversion module C2 Filter capacitor 201 Delay Unit TVS Zener diode 202 Drive unit ZD Zener diode DETAILED DESCRIPTION
[0045] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0047] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) 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.
[0048] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying 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 this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0049] Reference Figure 1 , Figure 1 This is a module diagram of the first embodiment of the single-coil relay control circuit proposed in this application. Figure 1 A first embodiment of a single-coil relay control circuit of the present application is provided.
[0050] The single coil relay control circuit comprises: a voltage input module 100, a resistance-capacitance delay module 200 and a coil freewheeling module 300;
[0051] The voltage input module 100 is connected to the first end of the RC delay module 200 and the first end of the coil freewheeling module 300 respectively; the second end of the RC delay module 200 is connected to the second end of the coil freewheeling module 300.
[0052] It should be noted that the single-coil relay control circuit mainly includes several important components: a voltage input module 100 , a RC delay module 200 , and a coil freewheeling module 300 .
[0053] The voltage input module 100 is used to generate a first driving signal and transmit the first driving signal to the RC delay module 200 .
[0054] It should be understood that the voltage input module 100 converts the first drive signal into an effective and reliable control signal required by the RC delay module 200, and the voltage input module 100 provides protection functions such as rectification, voltage regulation and filtering. The electronic components that make up this module can include current limiting resistors, rectifier bridges, voltage regulator diodes TVS, filter capacitors C2 and other devices, and the rectification, voltage regulation and filtering parts can be implemented in other ways. When the external power supply or control signal at the input end is stable, the rectification, voltage regulation or filtering module in this module can be removed.
[0055] The RC delay module 200 is used to receive the first driving signal and obtain the second driving signal by delay.
[0056] It should be noted that when the RC delay module 200 receives the first drive signal transmitted from the voltage input module 100, it starts delay processing. This delay processing is like setting a time buffer in the signal transmission process. It will carefully process the input signal, and after a certain time delay, a new signal, that is, the second drive signal, will be obtained. The acquisition of this second drive signal is controlled by the human, which lays the foundation for subsequent operations.
[0057] The coil freewheeling module 300 is used to drive the coil according to the voltage doubling of the second driving signal.
[0058] It should be understood that the task of the coil freewheeling module 300 is to double the voltage of the drive coil according to the received second drive signal and to supply power to the coil. In this process, the coil freewheeling module 300 uses the information carried by the second drive signal to increase the voltage to a level that can meet the needs of the drive coil through the internal circuit structure and working principle, thereby ensuring that the coil can work as expected, thereby achieving the normal operation of the entire single-coil relay control circuit.
[0059] This embodiment proposes a single-coil relay control circuit, which includes: a voltage input module 100, a RC delay module 200 and a coil freewheeling module 300; the voltage input module 100 is respectively connected to the first end of the RC delay module 200 and the first end of the coil freewheeling module 300; the second end of the RC delay module 200 is connected to the second end of the coil freewheeling module 300; the voltage input module 100 is used to generate a first drive signal and transmit it to the RC delay module 200; the RC delay module 200 is used to receive the first drive signal and delay to obtain a second drive signal; the coil freewheeling module 300 is used to drive the coil according to the second drive signal. The RC delay module 200 quickly turns on the internal MOS tube to shorten the action time of the relay contact, and the RC delay module 200 switches the low voltage in the power conversion module 400 to power the relay after the delay, which not only enables the relay to achieve faster action response, but also improves its anti-impact and vibration performance.
[0060] Reference Figure 2 , Figure 2 This is a module schematic diagram of the second embodiment of the single-coil relay control circuit proposed in the present application. Based on the first embodiment of the single-coil relay control circuit mentioned above, the second embodiment of the single-coil relay control circuit of the present application is proposed.
[0061] The single-coil relay control circuit further includes: a power conversion module 400;
[0062] The first end of the power conversion module 400 is connected to the third end of the RC delay module 200 ; the second end of the power conversion module 400 is connected to the second end of the coil freewheeling module 300 .
[0063] It should be understood that the first end of the power conversion module 400 is connected to the third end of the RC delay module 200. This connection mode enables effective signal transmission or energy interaction between the two. The second end of the power conversion module 400 is connected to the second end of the coil freewheeling module 300. This connection relationship lays the foundation for the subsequent function realization.
[0064] The power conversion module 400 is used to output a third driving signal to the coil freewheeling module 300 when the second driving signal stops being generated.
[0065] It should be noted that during the operation of the circuit, the power conversion module 400 undertakes an important task. When the second drive signal stops being generated, the power conversion module 400 will output a third drive signal to the coil freewheeling module 300. The cessation of the second drive signal here may be caused by some specific logical judgments in the circuit or changes in external conditions.
[0066] The coil freewheeling module 300 is further configured to drive the coil at a normal voltage according to the third driving signal.
[0067] It should be understood that after receiving the third drive signal output by the power conversion module 400, the coil freewheeling module 300 will perform an important operation, that is, to drive the coil at a constant voltage according to the third drive signal. The so-called constant voltage drive is to drive the coil at a relatively stable voltage to ensure that the coil can work normally, thereby realizing the normal function of the single-coil relay control circuit, such as controlling the operation of the relay to be closed or disconnected.
[0068] In this embodiment, a relay of a special structure is designed, and the rated working voltage of the coil of the special structure is different from the rated working voltage of the relay product itself. The rated working voltage of the coil is a multiple less than 1 (for example, 0.5 times) of the rated working voltage of the relay product. In the startup phase when the contacts are closed, the single coil is operated at a short-term overvoltage (coil rated working voltage) greater than 1 multiple of its rated working voltage, so as to achieve a driving relay mechanical structure greater than its rated ampere-turn ratio, so that the contact action response time is shorter; in the holding phase after the contacts are closed, the input voltage is reduced to the rated working voltage of the coil or lower than the rated working voltage through the built-in drive circuit, so that the relay has a stronger ability to resist vibration and impact or lower power consumption during operation to reduce the temperature rise of the product.
[0069] Reference Figure 3 , Figure 3 This is a circuit connection diagram of the third embodiment of the single-coil relay control circuit proposed in this application. Based on the first and second embodiments of the single-coil relay control circuit described above, the third embodiment of the single-coil relay control circuit of this application is proposed.
[0070] The RC delay module 200 includes: a delay unit 201 and a driving unit 202;
[0071] The first end of the delay unit 201 is connected to the voltage input module 100 ; the second end of the delay unit 201 is connected to the first end of the driving unit 202 ; and the third end of the delay unit 201 is connected to the second end of the coil freewheeling module 300 .
[0072] It should be noted that, in terms of the connection relationship, the first end of the delay unit 201 is connected to the voltage input module 100, and this connection establishes a channel for signal transmission. The second end of the delay unit 201 is connected to the first end of the drive unit 202, so that effective signal interaction can be carried out between the two. At the same time, the third end of the delay unit 201 is connected to the second end of the coil freewheeling module 300, thereby building an association relationship between the entire circuit modules.
[0073] The second end of the driving unit 202 is connected to the voltage input module 100 ; the third end of the driving unit 202 is connected to the second end of the coil freewheeling module 300 .
[0074] It should be understood that the second end of the drive unit 202 is connected to the voltage input module 100, and this connection relationship helps the drive unit 202 obtain the required voltage and other related resources. The third end of the drive unit 202 is also connected to the second end of the coil freewheeling module 300, further improving the connection layout of the entire circuit module.
[0075] The delay unit 201 is used to extend the generation time of the second driving signal.
[0076] It should be understood that the delay unit 201 is used to extend the generation time of the second driving signal. This function is of key significance in the operation of the entire circuit system, for example, it may affect the response sequence of subsequent circuit modules or the synchronization of signals.
[0077] The driving unit 202 is used to transmit the second driving signal to the coil freewheeling module 300 .
[0078] It should be noted that the function of the driving unit 202 is to transmit the second driving signal to the coil freewheeling module 300. This process ensures that the signal can reach the destination accurately, so that the coil freewheeling module 300 can perform corresponding operations based on the received signal to ensure the normal operation of the entire circuit system.
[0079] The delay unit 201 includes: a first resistor R1, a second resistor R2 and a first capacitor C1.
[0080] It should be noted that the first end of the first resistor R1 is connected to the voltage input module 100, the first end of the power conversion module 400 and the third end of the driving unit 202; the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the first end of the first capacitor C1; the second end of the second resistor R2 is connected to the first end of the driving unit 202; and the second end of the first capacitor C1 is connected to the second end of the driving unit 202.
[0081] The driving unit 202 includes: a first MOS tube.
[0082] It should be understood that the gate of the first MOS tube is connected to the second end of the second resistor R2; the drain of the first MOS tube is connected to the second end of the first capacitor C1; the source of the first MOS tube is connected to the first end of the voltage input module 100 and the power conversion module 400.
[0083] The coil freewheeling module 300 includes: a first diode D1 and a Zener diode ZD.
[0084] It should be noted that the cathode of the first diode D1 is connected to the cathode of the Zener diode ZD; the anode of the first diode D1 is connected to the voltage input module 100 ; and the anode of the Zener diode ZD is connected to the second end of the RC delay module 200 .
[0085] The voltage input module 100 includes: a second diode D2 and a voltage stabilizing diode TVS.
[0086] It should be understood that the anode of the second diode D2 is connected to an external power supply; the cathode of the second diode D2 is connected to the first end of the voltage stabilizing diode TVS and the first end of the RC delay module 200; and the second end of the voltage stabilizing diode TVS is grounded.
[0087] The single-coil relay control circuit further includes: a filter capacitor C2.
[0088] It should be noted that a first end of the filter capacitor C2 is connected to the RC delay module 200 and the power conversion module 400 ; and a second end of the filter capacitor C2 is grounded.
[0089] It should be noted that C1 is charged through resistors R1 and R2 to form a delay unit 201, which serves as a gate driver for the first MOS tube. When powered on, the potential at both ends of the capacitor cannot change suddenly, so the gate of the first MOS tube is 0V, and the external power supply is 12V, so Vgs = -12V, and the first MOS tube is turned on. When the capacitor is gradually charged to the same level as the external power supply, Vgs = 0V at this time, and the first MOS tube is turned off. In this process, the working state of the relay coil and the mechanical contact structure driven by the coil freewheeling module 300 is as follows: in the single coil structure, after the external power supply is powered on, the first MOS tube is turned on, the coil port is energized, the coil works with the external power supply voltage, and the contacts are closed. The external power supply voltage is usually greater than or equal to the rated voltage of the coil. When it is greater than the rated working voltage of the coil, the coil works in a voltage doubling mode, with maximum power consumption and maximum electromagnetic attraction. The relay contacts close quickly, reducing the relay action time. When the first MOS tube conduction voltage is equal to the rated working voltage of the coil, the relay is attracted at the rated working voltage, and the power switching module voltage in the holding stage is lower than the external power supply voltage. When the delay ends, the first MOS tube is turned off, and the external power supply cannot supply power to the coil.
[0090] In this embodiment, the internal MOS tube is quickly turned on by the RC delay module 200 to shorten the action time of the relay contact. The RC delay module 200 switches the low voltage in the power conversion module 400 to power the relay after the delay ends, which not only enables the relay to achieve faster action response, but also improves its performance in resisting impact and vibration.
[0091] In addition, the present application also proposes a relay. Since the relay adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0092] In addition, the present application also proposes an automation system. Since the automation system adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0093] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.
[0094] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A single-coil relay control circuit, characterized in that: The single-coil relay control circuit comprises: a voltage input module, a resistance-capacitance delay module and a coil freewheeling module; The voltage input module is respectively connected to the first end of the RC delay module and the first end of the coil freewheeling module; the second end of the RC delay module is connected to the second end of the coil freewheeling module; The voltage input module is used to generate a first driving signal and transmit it to the RC delay module; The RC delay module is used to receive the first driving signal and obtain the second driving signal by delay; The coil freewheeling module is used to drive the coil according to the voltage doubling of the second driving signal.
2. The single-coil relay control circuit according to claim 1, characterized in that: The single-coil relay control circuit further includes: a power conversion module; The first end of the power conversion module is connected to the third end of the RC delay module; the second end of the power conversion module is connected to the second end of the coil freewheeling module; The power conversion module is used to output a third drive signal to the coil freewheeling module when the second drive signal stops being generated; The coil freewheeling module is further used to drive the coil at a normal voltage according to the third driving signal.
3. The single-coil relay control circuit according to claim 2, characterized in that: The RC delay module includes: a delay unit and a driving unit; The first end of the delay unit is connected to the voltage input module; the second end of the delay unit is connected to the first end of the drive unit; the third end of the delay unit is connected to the second end of the coil freewheeling module; The second end of the driving unit is connected to the voltage input module; the third end of the driving unit is connected to the second end of the coil freewheeling module; The delay unit is used to extend the generation time of the second driving signal; The driving unit is used to transmit the second driving signal to the coil freewheeling module.
4. The single-coil relay control circuit according to claim 3, characterized in that: The delay unit comprises: a first resistor, a second resistor and a first capacitor; The first end of the first resistor is connected to the voltage input module, the first end of the power conversion module and the third end of the driving unit; the second end of the first resistor is connected to the first end of the second resistor and the first end of the first capacitor; The second end of the second resistor is connected to the first end of the driving unit; The second end of the first capacitor is connected to the second end of the driving unit.
5. The single-coil relay control circuit according to claim 3, characterized in that: The driving unit comprises: a first MOS tube; The gate of the first MOS tube is connected to the second end of the second resistor; The drain of the first MOS tube is connected to the second end of the first capacitor; The source of the first MOS tube is connected to the voltage input module and the first end of the power conversion module.
6. The single-coil relay control circuit according to claim 1, characterized in that: The coil freewheeling module comprises: a first diode and a Zener diode; The cathode of the first diode is connected to the cathode of the Zener diode; the anode of the first diode is connected to the voltage input module; The anode of the Zener diode is connected to the second end of the RC delay module.
7. The single-coil relay control circuit according to claim 1, characterized in that: The voltage input module includes: a second diode and a voltage regulator diode; The anode of the second diode is connected to an external power supply; the cathode of the second diode is connected to the first end of the voltage stabilizing diode and the first end of the RC delay module; The second end of the voltage stabilizing diode is grounded.
8. The single-coil relay control circuit according to claim 2, characterized in that: The single coil relay control circuit further includes: a filter capacitor; The first end of the filter capacitor is connected to the RC delay module and the power conversion module; The second end of the filter capacitor is grounded.
9. A relay, characterized in that: The relay comprises the single-coil relay control circuit as claimed in any one of claims 1 to 8.
10. An automated system, characterized in that: The automation system comprises the single-coil relay control circuit according to any one of claims 1 to 8.