Driving circuit for maintaining reduced power of relay coil
By employing a power-reducing drive circuit in the relay coil and using an eight-channel Darlington transistor and voltage divider resistors to switch the drive voltage, the problem of high-power relay coil temperature rise is solved, power consumption and temperature rise are reduced, and the reliability and stability of the relay are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-03
AI Technical Summary
In existing technologies, high-power relays have high coil drive power, which leads to large temperature rise, reducing the relay's service life and product stability.
The drive circuit employs a relay coil power reduction retention method, which uses eight Darlington transistors to achieve multi-channel Darlington drive. Combined with voltage divider resistors and diodes, it achieves switching between rated full voltage full power and resistive voltage divider power reduction, thereby reducing the coil drive voltage.
This effectively reduces the power consumption and temperature rise of the relay coil, improving the long-term operational reliability and stability of the relay.
Smart Images
Figure CN223967164U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of relay coil power reduction technology, specifically relating to a drive circuit for relay coil power reduction maintenance. Background Technology
[0002] In electronic technology, reducing the temperature rise of the relay coil and the driving power is a key aspect of the design of high-power relays, as this directly affects the long-term stable operation of the product.
[0003] Currently, most products on the market do not use a power reduction and holding drive design for the coil drive of high-power relays. Instead, they all use the rated voltage full power drive method, which results in high relay coil drive power, large coil temperature rise, reduced relay service life and product stability.
[0004] A drive circuit for maintaining the power of a relay coil with reduced power is proposed to address this issue. Utility Model Content
[0005] The purpose of this invention is to provide a drive circuit for power reduction and retention of a relay coil, thereby solving the problems mentioned in the background art. The drive circuit for power reduction and retention of a relay coil provided by this invention effectively reduces the power consumption and temperature rise of the relay coil, thus significantly improving the reliability and stability of the relay during long-term operation.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a drive circuit for power reduction retention of a relay coil, comprising a relay circuit and a power reduction retention drive circuit, wherein the relay circuit includes relay K1 and relay K2, and the power reduction retention drive circuit includes an eight-channel Darlington transistor U1, pin 14 of the eight-channel Darlington transistor U1 is connected to one end of a first voltage divider resistor and a second voltage divider resistor respectively, pin 16 of the eight-channel Darlington transistor U1 and the other end of the first voltage divider resistor are both connected to pin 5 of relay K1, pin 4 of relay K1 is connected to a +12V power supply, pin 15 of the eight-channel Darlington transistor U1 and the other end of the second voltage divider resistor are both connected to pin 5 of relay K2, pin 4 of relay K2 is connected to a +12V power supply, pin 9 of the eight-channel Darlington transistor U1 is connected to a +12V power supply, and pin 8 of the eight-channel Darlington transistor U1 is connected to a ground terminal.
[0007] Furthermore, the three-phase four-wire L1, L2, L3 and N are sequentially connected to the 8th pin of relay K1, the 7th pin of relay K1, the 8th pin of relay K2 and the 7th pin of relay K2, and the 1st pin of relay K1, the 2nd pin of relay K1, the 1st pin of relay K2 and the 3rd pin of relay K1 as output terminals.
[0008] Furthermore, pins 1, 2, and 3 of the eight-channel Darlington transistor U1 are control signal input pins.
[0009] To achieve voltage division, the first voltage divider resistor further includes resistors R1 and R2 connected in series.
[0010] To achieve voltage division, the second voltage dividing resistor further includes resistors R3 and R4 connected in series.
[0011] Furthermore, the power reduction drive circuit also includes a diode D1, wherein the positive terminal of the diode D1 is connected to the first voltage divider resistor, and the negative terminal of the diode D1 is connected to pin 4 of the relay K1.
[0012] Furthermore, the power reduction holding drive circuit also includes diode D2, wherein the positive terminal of diode D2 is connected to the second voltage divider resistor, and the negative terminal of diode D2 is connected to pin 4 of relay K2.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] This invention achieves the switching between rated full voltage and power reduction with a power reduction drive circuit, enabling reliable operation of the relay coil and application of power reduction drive. This effectively reduces the power consumption and temperature rise of the relay coil, thus significantly improving the reliability and stability of the relay during long-term operation. Attached Figure Description
[0015] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Example 1
[0018] Please see Figure 1This utility model provides the following technical solution: a drive circuit for power reduction retention of a relay coil, comprising a relay circuit and a power reduction retention drive circuit, wherein the relay circuit includes relay K1 and relay K2, and the power reduction retention drive circuit includes an eight-channel Darlington transistor U1, which implements multi-channel Darlington drive, model ULN2003ADR; pins 1, 2, and 3 of the eight-channel Darlington transistor U1 are control signal input pins, and pin 14 of the eight-channel Darlington transistor U1 is respectively connected to... One end of the first voltage divider resistor and the second voltage divider resistor are connected. Pin 16 of the eight-channel Darlington transistor U1 and the other end of the first voltage divider resistor are both connected to pin 5 of the relay K1. Pin 4 of the relay K1 is connected to the +12V power supply. Pin 15 of the eight-channel Darlington transistor U1 and the other end of the second voltage divider resistor are both connected to pin 5 of the relay K2. Pin 4 of the relay K2 is connected to the +12V power supply. Pin 9 of the eight-channel Darlington transistor U1 is connected to the +12V power supply. Pin 8 of the eight-channel Darlington transistor U1 is connected to the ground terminal.
[0019] By adopting the above technical solution, this utility model realizes the switching between rated full voltage and full power and resistive voltage division and power reduction through the power reduction drive circuit, realizes the reliable operation of the relay coil and the application of coil power reduction and power reduction drive, which can effectively reduce the power consumption and temperature rise of the relay coil during operation, and effectively improve the reliability and stability of the relay during long-term operation.
[0020] Specifically, in a three-phase four-wire system, L1, L2, L3, and N are connected sequentially to pins 8, 7, 8, and 7 of relay K1, and pins 1, 2, 1, and 3 of relay K1 as output terminals.
[0021] By adopting the above technical solution, relays K1 and K2 are both double-pole single-throw relays with auxiliary switch contacts, model HF198F / 12, used as switch switching control for three-phase four-wire power supply.
[0022] Specifically, the first voltage divider resistors include resistors R1 and R2 connected in series, both with a resistance of 13Ω.
[0023] By adopting the above technical solution, pressure division is achieved.
[0024] Specifically, the second voltage divider resistors include resistors R3 and R4 connected in series, both with a resistance of 13Ω.
[0025] By adopting the above technical solution, pressure division is achieved.
[0026] Example 2
[0027] The difference between this embodiment and embodiment 1 is that, specifically, the power reduction holding drive circuit also includes diode D1, wherein the positive terminal of diode D1 is connected to the first voltage divider resistor, and the negative terminal of diode D1 is connected to pin 4 of relay K1.
[0028] By adopting the above technical solution, the coil freewheeling diode of relay K1 is used.
[0029] Specifically, the power reduction drive circuit also includes diode D2, wherein the positive terminal of diode D2 is connected to the second voltage divider resistor, and the negative terminal of diode D2 is connected to pin 4 of relay K2.
[0030] By adopting the above technical solution, the coil freewheeling diode of relay K2 is used.
[0031] The activation control of relays K1 and K2 in this utility model includes the following steps:
[0032] (1) A high-level control signal is input to pins 1 and 2 of the eight-channel Darlington transistor U1, and a low-level control signal is input to pin 3 of the eight-channel Darlington transistor U1. At this time, the first and second channels of the eight-channel Darlington transistor U1 are turned on, and the third channel is turned off. The +12V power supply passes through pins 4 and 5 of relays K1 and K2, and then through pins 16 and 15 of the eight-channel Darlington transistor U1 to ground, forming the relay coil drive current. The coils of relays K1 and K2 receive the rated drive voltage of 12V to form the drive current. The output main contacts of relays K1 and K2 are closed between pins 8 and 1 and between pins 7 and 2.
[0033] (2) After holding the high-level control signal input to pins 1 and 2 of the eight-channel Darlington transistor U1 for 100ms, hold the high-level control signal input to pin 3 of the eight-channel Darlington transistor U1 for 10ms.
[0034] (3) When the low-level control signal is input to pins 1 and 2 of the eight-channel Darlington transistor U1, the first and second channels of the eight-channel Darlington transistor U1 are cut off and the third channel is turned on. The +12V power supply passes through the relays K1 and K2, pins 4 and 5, and then through resistors R2, R1, R4, R3 and pin 14 of the eight-channel Darlington transistor U1 to ground. At this time, the coils of relays K1 and K2 are connected in series with resistors R2, R1, R4 and R3 to divide the voltage, changing the original 12V to 7V power supply, reducing the driving voltage of the coil, thereby reducing the driving power of the relay coil. At the same time, the output main contacts of relays K1 and K2, pin 8 and pin 1, and pin 7 and pin 2, remain closed.
[0035] In summary, this utility model achieves the switching between rated full voltage and power reduction with resistive voltage division through a power reduction holding drive circuit, enabling reliable operation of the relay coil and application of coil power reduction holding drive. This effectively reduces the power consumption and temperature rise of the relay coil, and significantly improves the reliability and stability of the relay during long-term operation.
[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A drive circuit for relay coil power reduction hold, characterized by: The relay circuit comprises a relay K1 and a relay K2, and the low-power holding drive circuit comprises an eight-channel Darlington tube U1, the 14th pin of the eight-channel Darlington tube U1 is connected with one end of a first voltage dividing resistor and a second voltage dividing resistor respectively, the 16th pin of the eight-channel Darlington tube U1 and the other end of the first voltage dividing resistor are connected with the 5th pin of the relay K1, the 4th pin of the relay K1 is connected with a +12V power supply, the 15th pin of the eight-channel Darlington tube U1 and the other end of the second voltage dividing resistor are connected with the 5th pin of the relay K2, the 4th pin of the relay K2 is connected with the +12V power supply, the 9th pin of the eight-channel Darlington tube U1 is connected with the +12V power supply, and the 8th pin of the eight-channel Darlington tube U1 is connected with a ground terminal.
2. The relay coil power-down hold circuit according to claim 1, characterized by: The L1, L2, L3 and N of a three-phase four-wire system are connected with the 8th pin of the relay K1, the 7th pin of the relay K1, the 8th pin of the relay K2 and the 7th pin of the relay K2 in sequence, and the 1st pin, the 2nd pin, the 1st pin and the 3rd pin of the relay K1 and the relay K2 are used as output terminals.
3. The relay coil power-down hold circuit according to claim 1, wherein: The 1st pin, the 2nd pin and the 3rd pin of the eight-channel Darlington tube U1 are control signal input pins.
4. The relay coil power-down hold circuit according to claim 1, wherein: The first voltage dividing resistor comprises a resistor R1 and a resistor R2 connected in series.
5. The relay coil power-down hold circuit according to claim 1, wherein: The second voltage dividing resistor comprises a resistor R3 and a resistor R4 connected in series.
6. The relay coil power-down hold circuit according to claim 1, wherein: The low-power holding drive circuit further comprises a diode D1, wherein the anode of the diode D1 is connected with the first voltage dividing resistor, and the cathode of the diode D1 is connected with the 4th pin of the relay K1.
7. The relay coil power-down hold circuit according to claim 1, wherein: The low-power holding drive circuit further comprises a diode D2, wherein the anode of the diode D2 is connected with the second voltage dividing resistor, and the cathode of the diode D2 is connected with the 4th pin of the relay K2.