Circuit for reducing heating value of electromagnetic relay and electronic equipment

Abstract

The utility model discloses a circuit for reducing the calorific value of an electromagnetic relay and electronic equipment, and relates to the technical field of electronic equipment, the circuit comprises a power supply, an electromagnetic relay unit and a relay driving unit which are electrically connected in sequence, and an adjusting unit is connected between the power supply and the electromagnetic relay unit. And the adjusting unit is used for short-circuiting the power supply and the electromagnetic relay unit at the moment that the electromagnetic relay is electrified, and forming partial pressure with the electromagnetic relay unit when the electromagnetic relay is closed. In the pull-in stage of the electromagnetic relay, the current flowing through the electromagnetic relay is reduced, the heating value of the relay is reduced, and the power consumption is reduced. Especially in some scenes where relays need to be closed for a long time and the working current is large, the relay is very practical.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, specifically, to a circuit and electronic equipment for reducing the heat generation of an electromagnetic relay. Background Technology

[0002] The operation of an electromagnetic relay can be divided into two stages: the first stage is the pull-in stage, where the relay coil requires a large current to drive it initially; the second stage is the holding stage, where the relay is fully engaged and only needs to maintain this engaged state, requiring no further large current. Traditional relay drive circuits, such as... Figure 1 As shown, it draws a large current during both the pull-in and holding phases. Since the relay coil typically has a resistance of tens to hundreds of mΩ, the relay generates heat when current flows through it, especially in scenarios where the electromagnet's pull-in time is relatively long, resulting in significant power consumption. Utility Model Content

[0003] The purpose of this invention is to provide a circuit and electronic device for reducing the heat generation of electromagnetic relays, in order to solve the problem that electromagnetic relays in the prior art still carry a large current after being activated, resulting in large heat generation and high power consumption.

[0004] The present invention solves the above problems through the following technical solution:

[0005] A circuit for reducing the heat generation of an electromagnetic relay includes a power supply, an electromagnetic relay unit, and a relay drive unit connected in sequence. An adjustment unit is connected between the power supply and the electromagnetic relay unit. The adjustment unit is used to short-circuit the power supply and the electromagnetic relay unit at the moment the electromagnetic relay is energized, and to form a voltage divider with the electromagnetic relay unit when the electromagnetic relay is engaged.

[0006] At the instant the relay drive unit powers on the electromagnetic relay unit, the regulating unit is effectively short-circuited. The power supply voltage is directly applied to the electromagnetic relay unit, then to the relay drive unit, and finally to ground, forming a loop. The electromagnetic relay in the electromagnetic relay unit then engages. As the engagement time of the electromagnetic relay increases, a voltage divider is formed between the regulating unit and the electromagnetic relay unit. The voltage supplied by the power supply is applied to the electromagnetic relay unit after being divided. By selecting the resistance value of the regulating unit in the voltage divider state, the current flowing through the electromagnetic relay can be significantly reduced.

[0007] Furthermore, the adjustment unit includes an electrolytic capacitor EC1 and a first resistor. The first end of the electrolytic capacitor EC1 and the first end of the first resistor are connected to the power supply, and the first end of the electrolytic capacitor EC1 and the second end of the first resistor are connected to the electromagnetic relay unit.

[0008] At the instant the relay drive unit powers on the electromagnetic relay unit, the electrolytic capacitor EC1 is effectively short-circuited (due to the characteristics of a capacitor). Power flows directly through the electromagnetic relay unit, then to the relay drive unit, and finally to GND, forming a circuit, and the electromagnetic relay engages.

[0009] As the electromagnetic relay's engagement time increases, the electrolytic capacitor EC1 will gradually be fully charged. At this point, EC1 is essentially in an open circuit state, and the current in the relay coil is supplied by the first resistor. The power supply will directly pass through the first resistor, then through the electromagnetic relay and the relay drive unit, and finally to GND, forming a circuit.

[0010] Due to the presence of the first resistor, and the fact that the relay coil has a certain internal resistance, a voltage divider is formed. By selecting an appropriate value for the first resistor, the voltage and current received by the electromagnetic relay will be greatly reduced.

[0011] Furthermore, the electromagnetic relay unit includes an electromagnetic relay K1 and a diode D1. One end of the coil of the electromagnetic relay K1 and the cathode of the diode D1 are connected to the regulating unit, and the other end of the coil of the electromagnetic relay K1 and the anode of the diode D1 are connected to the relay driving unit.

[0012] Furthermore, the relay driving unit includes a microcontroller, a second resistor, a third resistor, and a transistor Q1. The collector of the transistor Q1 is connected to the electromagnetic relay unit, the base of the transistor Q1 is connected to the first end of the second resistor and the first end of the third resistor, the second end of the third resistor is connected to the emitter of the transistor Q1 and grounded, and the second end of the second resistor is connected to an I / O port of the microcontroller.

[0013] An electronic device includes the aforementioned circuit for reducing the heat generation of an electromagnetic relay.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] (1) In the electromagnetic relay's energizing phase, the current flowing through the electromagnetic relay is reduced, thus reducing the relay's heat generation and power consumption. This is very practical in scenarios where the relay needs to be closed for a long time and the operating current is large.

[0016] (2) The circuit of this utility model has low cost and simple implementation. Attached Figure Description

[0017] Figure 1 This refers to a relay drive circuit in the prior art;

[0018] Figure 2 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0020] Example 1:

[0021] Combined with appendix Figure 2 As shown, a circuit for reducing the heat generation of an electromagnetic relay includes a power supply, an electromagnetic relay unit, and a relay drive unit connected in sequence. An adjustment unit is connected between the power supply and the electromagnetic relay unit. The adjustment unit is used to short-circuit the power supply and the electromagnetic relay unit at the moment the electromagnetic relay is energized, and to form a voltage divider with the electromagnetic relay unit when the electromagnetic relay is energized.

[0022] Furthermore, the adjustment unit includes an electrolytic capacitor EC1 and a resistor R3, the electromagnetic relay unit includes an electromagnetic relay K1 and a diode D1, and the relay driving unit includes a microcontroller, resistors R1 and R2, and a transistor Q1. The first terminal of the electrolytic capacitor EC1 and the first terminal of the resistor R3 are connected to the power supply (+12V). The first terminal of the electrolytic capacitor EC1 and the second terminal of the resistor R3 are connected to one end of the coil of the electromagnetic relay K1 and the cathode of the diode D1. The other end of the coil of the electromagnetic relay K1 and the anode of the diode D1 are connected to the collector of the transistor Q1. The base of the transistor Q1 is connected to the first terminal of the resistor R1 and the first terminal of the resistor R2. The second terminal of the resistor R2 is connected to the emitter of the transistor Q1 and grounded. The second terminal of the resistor R1 is connected to one I / O port of the microcontroller.

[0023] A resistor R3 is connected in series with the power supply of the relay coil, and an electrolytic capacitor EC1 is connected in parallel with the series resistor R3; a transistor Q1 is connected in series with the electromagnetic relay coil and ground circuit to realize the switching of the relay coil current circuit; the switching of transistor Q1 is controlled by an I / O port of the microcontroller.

[0024] When the microcontroller's I / O outputs a high level, transistor Q1 is turned on. At the moment of power-on, electrolytic capacitor EC1 is essentially in a short-circuit state (a characteristic of capacitors). The +12V power supply will directly pass through the relay, then to transistor Q1, and finally to GND, forming a circuit, and the relay will be energized.

[0025] As the relay's engagement time increases, the electrolytic capacitor EC1 will gradually be fully charged. At this point, EC1 is essentially in an open circuit state, and the current in the relay coil is provided by resistor R3. The +12V power supply will directly pass through resistor R3, then through the relay and transistor, and finally to GND, forming a circuit.

[0026] Due to the presence of resistor R3, and the fact that the relay coil has a certain internal resistance, a voltage divider is formed. By selecting an appropriate value for resistor R3, the voltage and current received by the relay will be greatly reduced.

[0027] Compared to traditional relay drive circuits, the relay drive circuit of this invention adds an electrolytic capacitor EC1 and a resistor R3, which can greatly reduce the power consumption of the relay and thus reduce the heat generated by the relay. This is very practical in scenarios where the relay needs to be closed for a long time and operate with high current.

[0028] Example 2:

[0029] An electronic device includes the aforementioned circuit for reducing the heat generation of an electromagnetic relay.

[0030] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A circuit for reducing heat generation of an electromagnetic relay, comprising a power source, an electromagnetic relay unit, and a relay drive unit which are electrically connected in this order, characterized by comprising: a first resistor connected in series to the power source; a second resistor connected in series to the electromagnetic relay unit; and a third resistor connected in series to the relay drive unit, wherein the first resistor, the second resistor, and the third resistor are connected in parallel to each other. A regulating unit is connected between the power supply and the electromagnetic relay unit, and is used to short the power supply and the electromagnetic relay unit at the moment of energizing the electromagnetic relay, and to form a voltage divider with the electromagnetic relay unit when the electromagnetic relay is attracted.

2. The circuit for reducing heat generation of an electromagnetic relay according to claim 1, wherein The regulating unit comprises an electrolytic capacitor EC1 and a first resistor, a first end of the electrolytic capacitor EC1 and a first end of the first resistor are connected with the power supply, and a first end of the electrolytic capacitor EC1 and a second end of the first resistor are connected with the electromagnetic relay unit.

3. The circuit for reducing the heat generation of an electromagnetic relay according to claim 1 or 2, wherein The electromagnetic relay unit comprises an electromagnetic relay K1 and a diode D1, one end of the coil of the electromagnetic relay K1 and a cathode of the diode D1 are connected with the regulating unit, and the other end of the coil of the electromagnetic relay K1 and an anode of the diode D1 are connected with the relay drive unit.

4. The circuit for reducing the heat generation of an electromagnetic relay according to claim 1 or 2, wherein The relay drive unit comprises a single-chip microcomputer, a second resistor, a third resistor and a triode Q1, a collector of the triode Q1 is connected with the electromagnetic relay unit, a base of the triode Q1 is connected with a first end of the second resistor and a first end of the third resistor, a second end of the third resistor is connected with an emitter of the triode Q1 and grounded, and a second end of the second resistor is connected with an IO port of the single-chip microcomputer.

5. An electronic device, comprising: The circuit for reducing the heat generation of an electromagnetic relay comprises the circuit as claimed in any one of claims 1-4.

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