Relay loss reduction system

Abstract

The utility model discloses a relay loss reduction system. Comprising a relay loss reduction circuit; the relay loss reduction circuit is connected with the relay and is respectively provided with a first control end and a second control end; the BUCK step-down transformer is connected with the relay loss reduction circuit; and the power supply is respectively connected with the BUCK step-down transformer and the relay loss reduction circuit so as to form a first voltage control circuit Vn and a second voltage control circuit Vth. According to the application, the BUCK buck converter is arranged between the power supply and the relay loss reduction circuit, and the power supply is directly connected with the relay loss reduction circuit or the power supply is connected with the relay loss reduction circuit through the BUCK buck converter, so that when the relay is turned on, the coil voltage of the relay is controlled to be rated voltage by the relay loss reduction circuit; after the relay is closed, the relay loss reduction circuit is switched to a loss reduction mode after being delayed for several seconds, and the loss reduction voltage is relay closing holding voltage, so that the loss of the relay is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of relay loss reduction, in particular to a relay loss reduction system. Background Art

[0002] In the photovoltaic industry, firstly, due to the strict requirements of on-grid and off-grid switching, safety regulations and other functions, there are a large number of on-grid and off-grid output relays, which will cause great relay loss for the system and affect the efficiency of the whole machine; secondly, because the heat dissipation of household storage projects is mostly self-cooling, once the relay loss is too large, the heat dissipation burden inside the cavity will be increased, reducing the life of the whole machine. Based on these two reasons, the relay loss reduction function will become particularly important. Utility Model Content

[0003] In view of this, the present application provides a relay loss reduction system to reduce the loss of the relay and avoid the situation where the large loss of the relay affects the efficiency of the whole machine or causes heating in the cavity. The specific scheme is:

[0004] A relay loss reduction system, comprising:

[0005] A relay loss reduction circuit; connected to the relay, wherein the relay loss reduction circuit is provided with a first control terminal and a second control terminal;

[0006] BUCK step-down transformer, connected to the relay loss reduction circuit;

[0007] The power supply is respectively connected to the BUCK step-down transformer and the relay loss reduction circuit, thereby forming a first voltage control circuit Vn and a second voltage control circuit Vth.

[0008] Preferably, the loss reduction circuit includes: a rectifier device arranged on the relay loss reduction circuit and the second voltage control circuit Vth, a first on-off circuit arranged on the first control end and the first voltage control circuit Vn, and a second on-off circuit arranged between the relay loss reduction circuit and the second control end.

[0009] Preferably, the rectifying device is a diode.

[0010] Preferably, the first on-off circuit comprises a first MOS transistor Q1 and a second MOS transistor Q2 connected in series;

[0011] The first MOS transistor Q1 is connected to the relay and the second MOS transistor Q2 respectively, and the second MOS transistor Q2 is connected to the first control terminal;

[0012] The second on-off circuit includes a third MOS transistor Q3, and the third MOS transistor Q3 is connected to the relay and the second control terminal respectively.

[0013] Preferably, switching tube turn-on current-limiting resistors are respectively arranged between the first MOS transistor Q1 and the second MOS transistor Q2, between the second MOS transistor Q2 and the first control terminal, and between the third MOS transistor Q3 and the second control terminal;

[0014] Both ends of the switching tube turn-on current-limiting resistor are respectively connected to the first MOS transistor Q1 and the second MOS transistor Q2, between the second MOS transistor Q2 and the first control terminal, and between the third MOS transistor Q3 and the second control terminal.

[0015] Preferably, switching tube protection resistors are respectively arranged on the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3;

[0016] The switching tube protection resistors are respectively connected to the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3;

[0017] Preferably, the first MOS transistor Q1 is a P-MOSFET;

[0018] The second MOS transistor Q2 is an N-MOSFET;

[0019] The third MOS transistor Q3 is an N-MOSFET.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] In the present application, by providing two control terminals on the relay loss reduction circuit and arranging a BUCK buck converter between the power supply and the relay loss reduction circuit, the relay loss reduction circuit controls the coil voltage of the relay to be the rated voltage when the relay is turned on by directly connecting the power supply to the relay loss reduction circuit or connecting the power supply to the relay loss reduction circuit through the BUCK buck converter. After the relay is attracted, the "relay loss reduction circuit" switches to the loss reduction mode with a delay of several seconds (based on the relay attraction time), and the loss reduction voltage is the relay attraction holding voltage, thereby reducing the loss of the relay.

[0022] At the same time, in the present application, in the energy storage and photovoltaic industries, when there are many relays, the two connection methods between the power supply and the relay loss reduction circuit form two independent power supplies, which can ensure the conduction requirements of the relays and avoid the problem of excessive power caused by multiple relays in parallel.

[0023] Compared with the loss reduction circuit implemented by the PWM modulation function, which has problems such as many control signals required and large control switch power when multiple relays are in parallel, these problems do not need to be considered in this circuit, and only the stability of the power supply needs to be ensured. Description of the Drawings

[0024] Figure 1Schematic structural diagram of a relay loss reduction system of the present application;

[0025] Figure 2 Schematic principle diagram of a relay loss reduction circuit in a relay loss reduction system of the present application. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figure 1-2 , the present utility model provides a relay loss reduction system. It includes: a power supply, a relay loss reduction circuit, and a BUCK step-down converter.

[0028] The power supply is directly connected to the relay loss reduction circuit to form a first voltage regulation control circuit Vn, and the power supply is connected to the relay loss reduction circuit through a BUCK step-down converter to form a second voltage regulation control circuit Vth.

[0029] The relay loss reduction circuit is connected to both ends of the relay. There are two control terminals (i.e., the first control terminal CPU-I01 and the second control terminal CPU-I02) provided on the relay. In an embodiment of the present application, the first control terminal CPU-I01 and the second control terminal CPU-I02 are specifically: DSP and ARM or other devices with the same functions. The relay loss reduction circuit includes: a diode D1 provided between the relay loss reduction circuit and the second voltage regulation control circuit Vth, a first switching circuit provided between the first control terminal CPU-I01 and the first voltage regulation control circuit Vn, and a second switching circuit provided between the relay and the second control terminal CPU-I02;

[0030] Among them, the first switching circuit includes a first MOS transistor Q1 (specifically a P-MOSFET), a second protection resistor R2, a second MOS transistor Q2 (specifically an N-MOSFET), which are sequentially arranged between the first control terminal CPU-I01 and the first voltage regulation control circuit Vn, and a first protection resistor R1 provided on the first MOS transistor Q1. In an embodiment of the present application, the first MOS transistor, the second MOS transistor, and the third MOS transistor are all triodes. The specific connection is:

[0031] The G pole of the first MOS transistor Q1 is connected to the second MOS transistor Q2, and the S pole and D pole of the first MOS transistor Q1 are respectively connected to the first voltage regulation circuit Vn and the relay;

[0032] The G pole of the second MOS transistor Q2 is connected to the first control terminal, and the S pole and D pole of the second MOS transistor Q2 are grounded and connected to the first MOS transistor Q1 respectively;

[0033] The second switching circuit includes a third MOS transistor (specifically an N-MOSFET) and a third protection resistor R3 that are sequentially arranged between the relay and the second control terminal CPU-I02. The specific connection is as follows:

[0034] The G pole of the third MOS transistor Q3 is connected to one end of the third protection resistor R3, and the S pole and D pole of the third MOS transistor Q3 are grounded and connected to the relay respectively.

[0035] When the relay needs to be turned on, the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor are turned on respectively, and the first voltage regulating control circuit Vn (that is, the rated conduction voltage of the relay) is used to control the relay;

[0036] After the relay is turned on, the control of the relay is switched to the second voltage regulating control circuit Vth (that is, the holding voltage for the relay to be attracted and held). At this time, the first MOS transistor Q1 and the second MOS transistor Q2 are turned off, and the third MOS transistor Q3 is turned on.

[0037] It should be noted that:

[0038] In this application, whether it is a single relay control or a control of multiple relays, each relay only needs to be respectively connected to the loss reduction circuit, and each relay is controlled through two control terminals provided on the relay loss reduction circuit; when the power supply switches off the "rated conduction voltage", since the two power supplies are designed in a butt-joint manner, the power supply does not disconnect. After the "holding voltage" takes over the relay voltage, the loss is only that of the relay and the diode, and there is no loss in other redundant devices. Therefore, the power supply loss can be effectively reduced, and it is suitable for the application of various circuits;

[0039] In this application, in order to prevent each switching device from being mis-conducted and damaged by static electricity, switching tube protection resistors are respectively provided on the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3. The switching tube protection resistors include a first protection resistor R1, a fifth protection resistor R5, and a fourth protection resistor R4. Among them, both ends of the first protection resistor R1 are respectively connected to both ends of the first MOS transistor Q1; both ends of the fourth protection resistor R4 are respectively connected to both ends of the third MOS transistor Q3, and both ends of the fifth protection resistor R5 are respectively connected to both ends of the second MOS transistor Q2.

[0040] In this application, in order to prevent the driving current from being too large instantaneously, which may lead to insufficient driving ability or damage of the driving chip, switching transistor turn-on current-limiting resistors are respectively provided between the first MOS transistor Q1 and the second MOS transistor Q2, between the second MOS transistor Q2 and the first control terminal CPU-I01, and between the third MOS transistor Q3 and the second control terminal CPU-I02 to limit the driving current. The switching transistor protection resistors include a second protection resistor R2, a third protection resistor R3, and a sixth protection resistor R6. Among them, two ends of the second protection resistor R2 are respectively connected to the first MOS transistor Q1 and the second MOS transistor Q2; two ends of the third protection resistor R3 are respectively connected to the third MOS transistor Q3 and the second control terminal CPU-I02; two ends of the sixth protection resistor R6 are respectively connected to the second MOS transistor Q2 and the first control terminal CPU-I01.

[0041] In this application, the power supply is directly connected to the relay loss reduction circuit to form a first voltage regulation control circuit Vn, and the power supply is connected to the relay loss reduction circuit through a BUCK buck converter to form a second voltage regulation control circuit Vth, so as to make the relay turn-on voltage and hold voltage independent of each other, thereby realizing applications under different working conditions;

[0042] In this application, to drive multiple relays, it is only necessary to connect them to the loss reduction circuit respectively, and they can be driven through the first control terminal and the second control terminal without adding extra control points;

[0043] At the same time, this application uses fewer components, thus reducing costs.

Claims

1. A relay loss reduction system, characterized in that, Comprising: Relay loss reduction circuit; Connected to the relay, with a first control terminal and a second control terminal respectively provided on the relay loss reduction circuit; BUCK step-down transformer, connected to the relay loss reduction circuit; Power supply, connected to the BUCK step-down transformer and the relay loss reduction circuit respectively, thereby forming a first voltage control circuit Vn and a second voltage control circuit Vth.

2. The relay loss reduction system according to claim 1, wherein, The loss reduction circuit includes: a rectifying device provided on the relay loss reduction circuit and the second voltage control circuit Vth, a first on-off circuit provided on the first control terminal and the first voltage control circuit Vn, and a second on-off circuit provided between the relay loss reduction circuit and the second control terminal.

3. The relay loss reduction system according to claim 2, characterized in that, The rectifying device is a diode.

4. A relay loss reduction system according to claim 2, characterized in that, The first on-off circuit includes a first MOS transistor Q1 and a second MOS transistor Q2 connected in series; The first MOS transistor Q1 is respectively connected to the relay and the second MOS transistor Q2, and the second MOS transistor Q2 is connected to the first control terminal; The second on-off circuit includes a third MOS transistor Q3, and the third MOS transistor Q3 is respectively connected to the relay and the second control terminal.

5. A relay loss reduction system according to claim 4, wherein, Switch tube turn-on current limiting resistors are respectively provided between the first MOS transistor Q1 and the second MOS transistor Q2, between the second MOS transistor Q2 and the first control terminal, and between the third MOS transistor Q3 and the second control terminal; Both ends of the switch tube turn-on current limiting resistor are respectively connected to the first MOS transistor Q1 and the second MOS transistor Q2, between the second MOS transistor Q2 and the first control terminal, and between the third MOS transistor Q3 and the second control terminal.

6. A relay loss reduction system according to claim 4, wherein Switch tube protection resistors are respectively provided on the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3; The switch tube protection resistors are respectively connected to the first MOS transistor Q1, the second MOS transistor Q2, and the third MOS transistor Q3.

7. A relay loss reduction system according to claim 4, wherein The first MOS transistor Q1 is a P-MOSFET; The second MOS transistor Q2 is an N-MOSFET; The third MOS transistor Q3 is an N-MOSFET.

Images