Relay power supply circuit

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By introducing a voltage divider control circuit into the relay power supply circuit, the output voltage of the voltage stabilization circuit is reduced, and the problem of large losses of the relay when maintaining the contact suction state is solved, achieving a more efficient and power supply solution suitable for dense circuits and closed environments is achieved. .

CN222507458UActive Publication Date: 2025-02-18MORNSUN GUANGZHOU SCI & TECH

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Patent Information

Application Number: CN202420676424.9
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-04-02
Publication Date: 2025-02-18
Estimated Expiration: 2034-04-02

AI Technical Summary

Technical Problem

The existing relay power supply circuits have large losses and generate serious heat when maintaining the contact suction state, and are not suitable for dense circuits or closed working environments.

Method used

A relay power supply circuit is designed, including a voltage stabilization circuit, a voltage divider circuit and a voltage divider control circuit. The output voltage of the voltage stabilization circuit is controlled to be reduced after starting the machine and maintained at the set voltage value to reduce the relay. loss.

Benefits of technology

It realizes the reduction of the loss of the relay when maintaining the contact attachment state, improves efficiency and temperature performance, and is suitable for dense circuits and closed working environments.

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Patent Text Reader

Abstract

The utility model discloses a relay power supply circuit which comprises a voltage stabilizing circuit. The input end of the voltage division circuit is connected to the output end of the voltage stabilizing circuit, and the first output end of the voltage division circuit is connected to the control end of the voltage stabilizing circuit; the first input end of the voltage division control circuit is connected to the output end of the voltage stabilizing circuit, the output end of the voltage division control circuit is connected to the first output end of the voltage division circuit, and the second input end of the voltage division control circuit is connected to the second output end of the voltage division circuit; and the voltage division control circuit controls the output voltage of the voltage stabilizing circuit to be reduced and maintained at a set voltage value after starting by controlling the voltage of the first output end of the voltage division circuit. According to the utility model, the reduced output voltage after starting can be output through the voltage division control circuit, and the effect of reducing the loss of the relay is realized by utilizing the characteristic that only lower maintaining voltage needs to be provided after the relay contact is closed.

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Description

Technical Field

[0001] The utility model relates to the technical field of switch power supplies, in particular to a relay power supply circuit. Background Art

[0002] With the development of the power electronics industry, switching power supplies have been widely used in industry and daily life. Currently, the relay power supply circuit on the market generally uses a stable DC voltage to supply power and maintain the contact closure state. This control method causes the relay to produce large losses and serious heat generation, and is not suitable for dense circuits or closed working environments. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a relay power supply circuit, so as to reduce the loss of the relay when maintaining the contact absorbing state.

[0004] The utility model provides a relay power supply circuit, the relay power supply circuit comprising:

[0005] Voltage stabilizing circuit;

[0006] A voltage divider circuit, wherein an input end of the voltage divider circuit is connected to an output end of the voltage stabilizing circuit, and a first output end of the voltage divider circuit is connected to a control end of the voltage stabilizing circuit;

[0007] A voltage divider control circuit, wherein a first input end of the voltage divider control circuit is connected to an output end of the voltage stabilizing circuit, an output end of the voltage divider control circuit is connected to a first output end of the voltage divider circuit, and a second input end of the voltage divider control circuit is connected to a second output end of the voltage divider circuit;

[0008] The voltage-dividing control circuit controls the voltage of the first output terminal of the voltage-dividing circuit, thereby controlling the output voltage of the voltage-stabilizing circuit to decrease and be maintained at a set voltage value after startup.

[0009] Furthermore, the voltage divider control circuit includes a second switch tube, a fifth resistor and a first capacitor, the first end of the fifth resistor is connected to the output end of the voltage stabilizing circuit, the second end of the fifth resistor is connected to the control end of the second switch tube, the control end of the second switch tube is connected to the reference ground through the first capacitor, the first end of the second switch tube is connected to the second output end of the voltage divider circuit, and the second end of the second switch tube is connected to the first output end of the voltage divider circuit.

[0010] Furthermore, the voltage divider circuit includes a second resistor, a third resistor and a fourth resistor, the first end of the second resistor is connected to the output end of the voltage stabilizing circuit, the second end of the second resistor is connected to the first end of the fourth resistor through the third resistor, the second end of the fourth resistor is connected to a reference ground, the second end of the second resistor is connected to the second input end of the voltage divider control circuit, and the first end of the fourth resistor is respectively connected to the output end of the voltage divider control circuit and the control end of the voltage stabilizing circuit.

[0011] Furthermore, the voltage stabilizing circuit includes a first resistor, a first switch tube and a first controllable switch device, the first end of the first switch tube is connected to the voltage input end, the control end of the first switch tube is connected to the first end of the first switch tube through the first resistor, the second end of the first switch tube is respectively connected to the input end of the voltage divider circuit and the input end of the voltage divider control circuit, the control end of the first switch tube is connected to the first end of the first controllable switch device, the second end of the first controllable switch device is connected to the reference ground, and the control end of the first controllable switch device is connected to the output end of the voltage divider circuit.

[0012] Furthermore, the first switch tube is an NPN transistor, the collector of the first switch tube is connected to the voltage input terminal, the base of the first switch tube is connected to the collector of the first switch tube through the first resistor, the emitter of the first switch tube is respectively connected to the input terminal of the voltage divider circuit and the input terminal of the voltage divider control circuit, and the base of the first switch tube is connected to the first end of the first controllable switch device.

[0013] Furthermore, the first controllable switch device is a controllable precision voltage source, the control end of the first switch tube is connected to the cathode of the first controllable switch device, and the anode of the first controllable switch device is connected to the reference ground.

[0014] Furthermore, the second switch tube is an NMOS tube, the second end of the fifth resistor is connected to the gate of the second switch tube, the gate of the second switch tube is connected to the reference ground through the first capacitor, the drain of the second switch tube is connected to the second output end of the voltage divider circuit, and the source of the second switch tube is connected to the first output end of the voltage divider circuit.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] Compared with the traditional relay power supply circuit, the utility model can reduce the output voltage of the voltage stabilizing circuit after the relay is started by the voltage dividing control circuit, and utilizes the characteristic that only a lower maintenance voltage is required after the relay contact is closed to achieve the effect of reducing the relay loss at the output end, and has the advantages of high efficiency and good temperature.

[0017] Moreover, the utility model does not need an external signal to complete the action of reducing the maintenance voltage after the output to the relay completes the startup, which can save circuit layout and components. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model discloses a circuit principle diagram of a relay power supply circuit. DETAILED DESCRIPTION

[0019] The present invention and its beneficial effects will be further described in detail below in conjunction with specific implementation methods and drawings of the specification; however, the specific implementation methods of the present invention are not limited thereto.

[0020] refer to Figure 1 , the embodiment of the utility model provides a relay power supply circuit, the relay power supply circuit comprises:

[0021] Voltage stabilizing circuit 100;

[0022] A voltage divider circuit 200, wherein an input end of the voltage divider circuit 200 is connected to an output end of the voltage stabilizing circuit, and a first output end of the voltage divider circuit 200 is connected to a control end of the voltage stabilizing circuit;

[0023] A voltage divider control circuit 300, wherein a first input terminal of the voltage divider control circuit 300 is connected to an output terminal of the voltage stabilizing circuit, an output terminal of the voltage divider control circuit 300 is connected to a first output terminal of the voltage divider circuit 200, and a second input terminal of the voltage divider control circuit 300 is connected to a second output terminal of the voltage divider circuit 200;

[0024] The voltage-dividing control circuit 300 controls the voltage of the first output terminal of the voltage-dividing circuit 200 , thereby controlling the output voltage of the voltage-stabilizing circuit to decrease and be maintained at a set voltage value after startup.

[0025] A voltage divider circuit 200, wherein an input end of the voltage divider circuit 200 is connected to an output end of the voltage stabilizing circuit 100, and a first output end of the voltage divider circuit 200 is connected to a control end of the voltage stabilizing circuit 100;

[0026] The voltage divider control circuit 300 is connected to the first output terminal and the second output terminal of the voltage divider circuit 200. The voltage divider control circuit 300 controls the voltage at the second output terminal of the voltage divider circuit 200, thereby controlling the output voltage of the voltage stabilizing circuit 100 to decrease and maintain at a set voltage value after startup.

[0027] The output end of the voltage stabilizing circuit 100 is output to the relay.

[0028] In one embodiment, the voltage divider circuit 200 includes a second resistor R2, a third resistor R3 and a fourth resistor R4, the first end of the second resistor R2 is connected to the output end of the voltage stabilizing circuit 100, the second end of the second resistor R2 is connected to the first end of the fourth resistor R4 through the third resistor R3, the second end of the fourth resistor R4 is connected to the reference ground, the second end of the second resistor is connected to the second input end of the voltage divider control circuit 300, and the first end of the fourth resistor R4 is respectively connected to the output end of the voltage divider control circuit 300 and the control end of the voltage stabilizing circuit 100.

[0029] In one embodiment, the voltage stabilizing circuit 100 includes a first resistor R1, a first switch tube Q1 and a first controllable switch device U1, the first end of the first switch tube Q1 is connected to the voltage input end Vin, the control end of the first switch tube Q1 is connected to the first end of the first switch tube Q1 through the first resistor R1, the second end of the first switch tube Q1 is respectively connected to the input end of the voltage divider circuit 200 and the input end of the voltage divider control circuit 300, the control end of the first switch tube Q1 is connected to the first end of the first controllable switch device U1, the second end of the first controllable switch device U1 is connected to the reference ground, and the control end of the first controllable switch device U1 is connected to the output end of the voltage divider circuit 200.

[0030] In this embodiment, the first switch tube Q1 is an NPN transistor, the collector of the first switch tube Q1 is connected to the voltage input terminal Vin, the base of the first switch tube Q1 is connected to the collector of the first switch tube Q1 through the first resistor R1, the emitter of the first switch tube Q1 is respectively connected to the input terminal of the voltage divider circuit 200 and the input terminal of the voltage divider control circuit 300, and the base of the first switch tube Q1 is connected to the first end of the first controllable switch device U1.

[0031] In this embodiment, the first controllable switch device U1 is a controllable precision voltage source, the control end of the first switch tube Q1 is connected to the cathode of the first controllable switch device U1, and the anode of the first controllable switch device U1 is connected to the reference ground.

[0032] In one embodiment, the voltage divider control circuit 300 includes a second switch tube Q2, a fifth resistor R5 and a first capacitor C1, the first end of the fifth resistor R5 is connected to the output end of the voltage stabilizing circuit 100, the second end of the fifth resistor R5 is connected to the control end of the second switch tube Q2, the control end of the second switch tube Q2 is connected to the reference ground through the first capacitor C1, the first end of the second switch tube Q2 is connected to the second output end of the voltage divider circuit 200, and the second end of the second switch tube Q2 is connected to the first output end of the voltage divider circuit 200.

[0033] In this embodiment, the second switching transistor Q2 is an NMOS transistor. The second terminal of the fifth resistor R5 is connected to the gate of the second switching transistor Q2. The gate of the second switching transistor Q2 is connected to the reference ground through the first capacitor C1. The drain of the second switching transistor Q2 is connected to the second output terminal of the voltage dividing circuit 200, and the source of the second switching transistor Q2 is connected to the first output terminal of the voltage dividing circuit 200.

[0034] In this embodiment, the controllable precision voltage regulator uses a TL431 chip (breakdown voltage Vu).

[0035] ① When the power supply is started, U1 is in the cut-off state. Vin provides a driving current to the first switching transistor Q1 through the first resistor R1 to make it conduct, so as to supply power to V0 to close the relay contact. At this time, the voltage of pin 1 of the first controllable switching device U1 is

[0036] ② V0 supplies power to the second switching transistor Q2 through the fifth resistor R5 to make it conduct, short-circuiting the third resistor R3. At this time, the voltage of pin 1 of the first controllable switching device U1 is

[0037] ③ When V1 > Vu, the first controllable switching device U1 conducts to drive the first switching transistor Q1 to ground, reducing V0; when V0 drops to V1 < Vu, the first controllable switching device U1 cuts off, and the first switching transistor Q1 conducts to continue supplying power to V0. The circuit forms a linear voltage regulation to stabilize V0 at to maintain the relay in the closed state. By adjusting the resistance ratio of R2 / R3 / R4 in the voltage dividing circuit, the voltage V0 that maintains the relay in the closed state can be adjusted.

[0038] The above is only the preferred embodiment of the present invention. If more equivalent deformations or substitutions are added on this basis, they shall also fall within the protection scope of this patent. It should be noted that the above preferred embodiment should not be regarded as a limitation of the present invention. For those of ordinary skill in the art, without departing from the spirit and scope of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention. Here, no more embodiments will be described in detail. The protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A relay power supply circuit, characterized in that: The relay power supply circuit comprises: Voltage stabilizing circuit; A voltage divider circuit, wherein an input end of the voltage divider circuit is connected to an output end of the voltage stabilizing circuit, and a first output end of the voltage divider circuit is connected to a control end of the voltage stabilizing circuit; A voltage divider control circuit, wherein a first input end of the voltage divider control circuit is connected to an output end of the voltage stabilizing circuit, an output end of the voltage divider control circuit is connected to a first output end of the voltage divider circuit, and a second input end of the voltage divider control circuit is connected to a second output end of the voltage divider circuit; The voltage-dividing control circuit controls the voltage of the first output terminal of the voltage-dividing circuit, thereby controlling the output voltage of the voltage-stabilizing circuit to decrease and be maintained at a set voltage value after startup.

2. The relay power supply circuit according to claim 1, characterized in that: The voltage divider control circuit includes a second switch tube, a fifth resistor and a first capacitor, the first end of the fifth resistor is connected to the output end of the voltage stabilizing circuit, the second end of the fifth resistor is connected to the control end of the second switch tube, the control end of the second switch tube is connected to the reference ground through the first capacitor, the first end of the second switch tube is connected to the second output end of the voltage divider circuit, and the second end of the second switch tube is connected to the first output end of the voltage divider circuit.

3. The relay power supply circuit according to claim 1, characterized in that: The voltage divider circuit includes a second resistor, a third resistor and a fourth resistor, the first end of the second resistor is connected to the output end of the voltage stabilizing circuit, the second end of the second resistor is connected to the first end of the fourth resistor through the third resistor, the second end of the fourth resistor is connected to a reference ground, the second end of the second resistor is connected to the second input end of the voltage divider control circuit, and the first end of the fourth resistor is respectively connected to the output end of the voltage divider control circuit and the control end of the voltage stabilizing circuit.

4. The relay power supply circuit according to claim 1, characterized in that: The voltage stabilizing circuit includes a first resistor, a first switch tube and a first controllable switch device. The first end of the first switch tube is connected to the voltage input end, the control end of the first switch tube is connected to the first end of the first switch tube through the first resistor, the second end of the first switch tube is respectively connected to the input end of the voltage divider circuit and the input end of the voltage divider control circuit, the control end of the first switch tube is connected to the first end of the first controllable switch device, the second end of the first controllable switch device is connected to the reference ground, and the control end of the first controllable switch device is connected to the output end of the voltage divider circuit.

5. The relay power supply circuit according to claim 4, characterized in that: The first switch tube is an NPN transistor, the collector of the first switch tube is connected to the voltage input terminal, the base of the first switch tube is connected to the collector of the first switch tube through the first resistor, the emitter of the first switch tube is respectively connected to the input terminal of the voltage divider circuit and the input terminal of the voltage divider control circuit, and the base of the first switch tube is connected to the first terminal of the first controllable switch device.

6. The relay power supply circuit according to claim 4, characterized in that: The first controllable switch device is a controllable precision voltage source, the control end of the first switch tube is connected to the cathode of the first controllable switch device, and the anode of the first controllable switch device is connected to the reference ground.

7. The relay power supply circuit according to claim 2, characterized in that: The second switch tube is an NMOS tube, the second end of the fifth resistor is connected to the gate of the second switch tube, the gate of the second switch tube is connected to the reference ground through the first capacitor, the drain of the second switch tube is connected to the second output end of the voltage divider circuit, and the source of the second switch tube is connected to the first output end of the voltage divider circuit.

8. A relay power supply circuit, characterized in that: The relay power supply circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first switch tube, a second switch tube, a first controllable switch device and a first capacitor. The first end of the fifth resistor and the first end of the second resistor are both connected to the second end of the first switch tube, the second end of the fifth resistor is connected to the control end of the second switch tube, the control end of the second switch tube is connected to the reference ground through the first capacitor, the second end of the second resistor is connected to the first end of the fourth resistor through the third resistor, the second end of the fourth resistor is connected to the reference ground, the second end of the second resistor is connected to the first end of the second switch tube, the first end of the fourth resistor is respectively connected to the second end of the second switch tube and the control end of the first controllable switch device, the first end of the first switch tube is connected to the voltage input end, the control end of the first switch tube is connected to the first end of the first switch tube through the first resistor, the control end of the first switch tube is connected to the first end of the first controllable switch device, and the second end of the first controllable switch device is connected to the reference ground.