Relay operation time self-correcting circuit

Abstract

The utility model belongs to the technical field of relays, and particularly discloses a relay operation time self-correcting circuit, which comprises a DSP chip, a driving circuit and a relay, the relay comprises a coil, an auxiliary contact and a main contact, the main contact of the relay is electrically connected to a main power loop, and the auxiliary contact is electrically connected to the main power loop. The output end of the DSP chip is electrically connected with a coil of the relay through the drive circuit, and the input end of the DSP chip is electrically connected with an auxiliary contact of the relay. According to the utility model, the action time of the relay is accurately calculated by using the auxiliary contact of the relay, so that correction and compensation can be carried out, the relay is more accurately controlled to be switched on and off at a zero crossing point, electric arcs are effectively prevented from being generated in the switching process of the relay, and the relay contact is prevented from being damaged due to the electric arcs; and the reliability and the stability of the equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a relay action time self-correction circuit. Background Technology

[0002] Relays are crucial components in electrical control systems, and the opening and closing of their contacts directly impacts the stability and reliability of the equipment. During the switching process, an electric arc forms between the two contacts; the greater the voltage difference, the more severe the arcing. The heat generated during arcing damages the relay contacts, and in severe cases, the two contacts may stick together, causing relay failure and affecting the normal operation of the equipment. When a relay switches on or off near the zero-crossing point of the AC current, the voltage between the contacts approaches zero, significantly reducing the arcing and extending the relay's lifespan, thus ensuring the reliability of the equipment.

[0003] The signal triggering timing is typically precisely adjusted in the relay control circuit. This is because relays have a certain delay between engaging and disengaging, such as... Figure 1 As shown, the control circuit needs to output a drive signal before the AC zero-crossing point to ensure that the relay is switched on and off at the predicted zero-crossing point.

[0004] However, the activation and deactivation times of a relay are affected by factors such as the relay's specifications, coil voltage, and load conditions. Even relays of the same model can have different operating times, making it challenging to control the relay's on / off state at the zero-crossing point. With a fixed time adjustment, the relay's activation and deactivation will deviate somewhat from the expected zero-crossing point.

[0005] Traditional relay zero-crossing switching circuits, such as Figure 2 As shown, the DSP chip detects the zero-crossing signal on the AC side and then predicts the zero-crossing time of the next cycle based on the frequency of the AC power. When it is necessary to close or open the relay, the DSP chip outputs an action signal in advance at the zero-crossing point according to the set relay action time Tc\To. The action time Tc\To is obtained by testing and evaluating the action time distribution of relay samples, or by calculating it using a complex formula. However, this method may result in some individual relays having a large action time distribution, causing the relay to deviate from the zero point when switching on or off, and even potentially engaging at the voltage peak. Utility Model Content

[0006] The purpose of this invention is to solve the technical problems existing in the background art. To this end, a relay action time self-correction circuit is provided.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A relay action time self-correcting circuit, comprising a DSP chip, a driving circuit and a relay;

[0009] The relay comprises a coil, auxiliary contacts and main contacts, the main contacts of the relay are electrically connected on a main power loop,

[0010] The output end of the DSP chip is electrically connected with the coil of the relay through the driving circuit;

[0011] The input end of the DSP chip is electrically connected with the auxiliary contacts of the relay.

[0012] The auxiliary contacts of the relay are connected to voltage VCC1 through resistance R1.

[0013] The auxiliary contacts of the relay are grounded.

[0014] The auxiliary contacts of the relay are grounded.

[0015] The auxiliary contacts of the relay are connected to voltage VCC1.

[0016] The input end of the DSP chip is electrically connected on a line between resistance R1 and the auxiliary contacts of the relay.

[0017] The driving circuit comprises resistance R2 and triode Q1, the output end of the DSP chip is electrically connected with the base of triode Q1 through resistance R2, and the emitter of triode Q1 is electrically connected with one end of the coil of the relay.

[0018] The other end of the coil of the relay is grounded.

[0019] The collector of triode Q1 is connected to voltage VCC2.

[0020] The main power loop is electrically connected with the DSP chip through an alternating current zero-crossing detection circuit.

[0021] Compared with the prior art, the relay action time self-correcting circuit has the following technical effects:

[0022] The utility model discloses utilize the auxiliary contact of relay, the action time of relay is calculated accurately, thereby can carry out correction compensation, make the relay control at zero -crossing point on -off become more accurate, effectively prevent the electric arc of relay in switching process, avoid the relay contact because of the electric arc and cause the relay function damage, improve the reliability and stability of equipment.

[0023] The utility model is further described below in connection with the drawings and embodiments. DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiments or prior art will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0025] Figure 1 It is the action contrastive drawing of relay drive attraction / disconnection and alternating current;

[0026] Figure 2 It is the traditional relay zero-crossing on-off circuit connection relation diagram of prior art;

[0027] Figure 3 It is the circuit principle relation diagram of embodiment 1 of the utility model;

[0028] Figure 4 It is the circuit principle relation diagram of embodiment 2 of the utility model;

[0029] Figure 5 It is the specific circuit connection relation diagram of embodiment 1 of the utility model.

[0030] Fig. 1, DSP chip;2, driving circuit;3, alternating current zero-crossing detection circuit. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent and easy to understand, the specific implementation of the utility model will be described in detail below in connection with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. But the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0032] Embodiment 1

[0033] As Figure 3As shown, this embodiment provides a relay action time self-correction circuit, mainly including a DSP chip 1, a drive circuit 2, a relay K1, a resistor R1, and an AC zero-crossing detection circuit 3. It should be noted that the main power circuit is electrically connected to the DSP chip through the AC zero-crossing detection circuit 3. The AC zero-crossing detection circuit 3 is existing technology. Figure 2 As shown, adding the AC zero-crossing detection circuit 3 to the technical solution of this utility model can be used as another option to correct the relay action time.

[0034] Relay K1 includes a coil, auxiliary contact B, and main contact A.

[0035] The main contact A of relay K1 is electrically connected to the main power circuit. One end of the auxiliary contact B of relay K1 is connected to the supply voltage VCC1 through resistor R1, and the other end of the auxiliary contact B of relay K1 is grounded. The input terminal of DSP chip 1 is electrically connected to the line between resistor R1 and the auxiliary contact B of relay K1. The output terminal of DSP chip 1 is electrically connected to the coil of relay K1 through drive circuit 2.

[0036] Example 2

[0037] like Figure 4 As shown, this embodiment provides a relay action time self-correction circuit, which mainly includes a DSP chip 1, a drive circuit 2, a relay K1, a resistor R1, and an AC zero-crossing detection circuit 3.

[0038] Relay K1 includes a coil, auxiliary contact B, and main contact A.

[0039] The main contact A of relay K1 is electrically connected to the main power circuit. One end of the auxiliary contact B of relay K1 is grounded through resistor R1, and the other end of the auxiliary contact B is connected to the power supply voltage VCC1. The input terminal of DSP chip 1 is electrically connected to the line between resistor R1 and the auxiliary contact B of relay K1. The output terminal of DSP chip 1 is electrically connected to the coil of relay K1 through drive circuit 2.

[0040] The circuit of Example 1 will be described in more detail below:

[0041] like Figure 5 As shown, the driving circuit 2 includes a resistor R2 and a transistor Q1. The output terminal of the DSP chip 1 is electrically connected to the base of the transistor Q1 through the resistor R2. The emitter of the transistor Q1 is electrically connected to one end of the coil of the relay K1, and the other end of the coil of the relay K1 is grounded. The collector of the transistor Q1 is connected to the power supply voltage VCC2.

[0042] Therefore, the relay K1 is an electromagnetic relay with auxiliary contact, and the auxiliary contact B and the main contact A are associated. The main contact A is used for on-off of the main power circuit, and the auxiliary contact B is used for monitoring the state of the relay.

[0043] The DSP chip 1 controls the attraction and release of the relay K1 through the resistance R1 and the transistor Q1. When the output check signal is high, the relay K1 contact is attracted, and when the output check signal is low, the relay K1 contact is released.

[0044] The DSP chip 1 can monitor the state of the relay in real time through the state signal. When the state signal is high, the relay K1 is in the open state; when the state signal is low, the relay K1 is in the attracted state.

[0045] Therefore, when the DSP chip 1 output signal check changes from low to high, record the time Tcp1, and when the DSP chip 1 detects that the state signal changes from high to low, record the time Tcp2. Calculate the attraction time Tcp of the relay Tcp2-Tcp1, so that the DSP chip is in calibration mode, and correct the Tc time in the DSP control system, so that Tc=Tcp. Similarly, the release time of the relay is corrected, so that To=Tcp. It should be noted that after the attraction time or release time of the relay is calculated, the DSP chip can correct and calibrate the relay action time through the existing internal algorithm, and the internal algorithm of the DSP chip is not within the protection scope of the present application, and is only used for the understanding of the relay action time correction by the person skilled in the art.

[0046] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present application, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present application. Therefore, any equivalent changes made according to the shape, structure and principle of the present application, which do not depart from the technical solution of the present application, should be covered within the protection scope of the present application.

Claims

1. A self-correcting circuit for relay operating time, characterized by comprising: The relay includes a coil, an auxiliary contact and a main contact, the main contact of the relay is electrically connected on a main power circuit, The output of the DSP chip is electrically connected with the coil of the relay through the driving circuit. The input of the DSP chip is electrically connected with the auxiliary contact of the relay. One end of the auxiliary contact of the relay is connected to the supply voltage through a resistor R1.

2. A self-correcting circuit for a relay operating time according to claim 1, wherein The other end of the auxiliary contact of the relay is grounded.

3. A self-correcting circuit for a relay operating time according to claim 2, wherein One end of the auxiliary contact of the relay is grounded through a resistor R1.

4. A self-correcting circuit for a relay operating time according to claim 1, wherein The other end of the auxiliary contact of the relay is connected to the supply voltage.

5. A self-correcting circuit for a relay according to claim 4, wherein The input of the DSP chip is electrically connected on the circuit between the resistor R1 and the auxiliary contact of the relay.

6. A self-correcting circuit for a relay according to claim 2 or 4, wherein The driving circuit includes a resistor R2 and a transistor Q1, the output of the DSP chip is electrically connected with the base of the transistor Q1 through the resistor R2, the emitter of the transistor Q1 is electrically connected with one end of the coil of the relay.

7. A self-correcting circuit for a relay according to claim 1, wherein The other end of the coil of the relay is grounded.

8. A self-correcting circuit for a relay according to claim 7, wherein The collector of the transistor Q1 is connected to the supply voltage.

9. A self-correcting circuit for a relay according to claim 7, wherein The main power circuit is electrically connected with the DSP chip through an AC zero-crossing detection circuit.

10. A self-correcting circuit for a relay according to claim 1, wherein ​

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