CN104466883A - Relay protection outlet lockout circuit - Google Patents

Abstract

The application provides a relay protection outlet blocking circuit, including a main controller, a blocking controller, a first outlet power relay, a second outlet power relay and an outlet relay; the main controller is connected with the locking controller and the first outlet power supply respectively The control end of the relay is connected to the first side; the second side of the control end of the first outlet power relay is connected to the outlet relay power supply, the first node of the first outlet power relay is connected to the outlet relay power supply, and the second node of the first outlet power relay It is connected to the node of the second outlet power relay; the control end of the second outlet power relay is connected to the locking controller and the system power supply of the locking controller respectively, and the node of the second outlet power relay is connected to the first side of the control end of the outlet relay; The second side of the control terminal of the outlet relay is connected with the main controller. The application reduces the probability that the main controller controls the export relay to output an error signal, and improves the stability of the power system.

Description

A relay protection exit blocking circuit

technical field

This application relates to the field of relay protection circuit hardware design, in particular to a relay protection exit blocking circuit.

Background technique

With the rapid development of the national economy, all walks of life are more and more dependent on electricity, so the requirements for the stability of the power system are also getting higher and higher.

However, with the development of power technology, the control circuit in the power system is becoming more and more complex, the controller in the control circuit is becoming more and more sensitive, and it is more and more susceptible to external interference, which makes the controller output wrong control due to its susceptibility to interference. Instructions cause the outlet relay controlled by the controller to output wrong signals and cause damage to external equipment or circuits, which affects the stability of the power system.

It can be seen from the above that it is an urgent problem to be solved at present to prevent the controller in the control circuit of the power system from outputting control commands by mistake and causing the outlet relay to output wrong signals as much as possible.

Contents of the invention

In order to solve the above technical problems, the embodiment of the present application provides a relay protection exit blocking circuit to reduce the probability of the main controller controlling the exit relay to output an error signal and improve the stability of the power system. The technical solution is as follows:

A relay protection exit blocking circuit, including a main controller, a blocking controller, a first exit power relay, a second exit power relay and an exit relay;

The main controller is respectively connected to the first side of the control terminal of the locking controller and the first outlet power relay;

The second side of the control end of the first outlet power relay is connected to the outlet relay power supply, the first node of the first outlet power relay is connected to the outlet relay power supply, and the second node of the first outlet power relay is connected to the outlet relay power supply. The nodes of the second outlet power relay are connected;

The control terminal of the second outlet power relay is connected to the locking controller and the system power supply of the locking controller respectively, and the node of the second outlet power relay is connected to the first side of the control terminal of the outlet relay;

The second side of the control end of the outlet relay is connected to the main controller;

When the main controller determines that the system to which the main controller belongs is operating normally and that the blocking controller is working normally, it controls the first outlet power relay to be turned on; when the blocking controller determines that the main control When the system to which the device belongs is running normally and the main controller is working normally, control the second outlet power relay to be turned on; when the first outlet power relay is on and the second outlet power relay is on, the The main controller controls the outlet relay to output corresponding signals.

Preferably, it also includes: a first control circuit, a second control circuit and a third control circuit;

The first input end of the first control circuit is connected to the main controller, the second input end of the first control circuit is connected to the system power supply of the main controller, and the first control circuit first The output terminal is connected to the first side of the control terminal of the first outlet power relay, and the second output terminal of the first control circuit is grounded;

The second control circuit is connected to the second outlet power relay;

The first input end of the third control circuit is connected to the main controller, the second input end of the third control circuit is connected to the system power supply of the main controller, and the first input end of the third control circuit The output end is grounded, and the second output end of the third control circuit is connected to the second side of the control end of the outlet relay.

Preferably, the first outlet power relay is an electromagnetic relay, the second outlet power relay is a photorelay, and the outlet relay is an electromagnetic relay.

Preferably, the first control circuit includes: a first resistor and a first optocoupler;

The first end of the first resistor is connected to the main controller as the first input end of the first control circuit, and the second end of the first resistor is connected to the light-emitting element of the first optocoupler. The second pin is connected;

The first pin of the light-emitting element of the first optocoupler is connected to the system power supply of the main controller, the first pin of the light-receiving element of the first optocoupler is grounded, and the light-receiving element of the first optocoupler The second pin is connected to the coil negative end of the first outlet power relay;

The negative coil terminal of the first outlet power relay is used as the first side of the control terminal of the first outlet power relay, and the positive coil end of the first outlet power relay is used as the second control terminal of the first outlet power relay. On the side, the first node of the first outlet power relay includes a first input pin and a second input pin;

The second control circuit includes: a second resistor and a third resistor;

The first end of the second resistor is connected to the first pin of the first light-emitting element of the second outlet power relay, and the second end of the second resistor is connected to the system power supply of the locking controller, so The second pin of the first light-emitting element of the second outlet power relay is connected to the locking controller;

The first end of the third resistor is connected to the first pin of the second light-emitting element of the second outlet power relay, and the second end of the third resistor is connected to the system power supply of the locking controller, so The second pin of the second light-emitting element of the second outlet power relay is connected to the locking controller;

The first pin and the second pin of the first light-emitting element of the second outlet power relay and the first pin and the second pin of the second light-emitting element of the second outlet power relay serve as the second The control end of the outlet power relay, the common end of the first output pin and the second output pin included in the second node of the first outlet power relay, respectively connected to the first light-receiving element of the second outlet power relay The first pin of the second outlet power supply relay is connected to the first pin of the second light-receiving element;

The third control circuit includes: a fourth resistor and a second optocoupler;

The first end of the fourth resistor is connected to the main controller, the second end of the fourth resistor is connected to the second pin of the light-emitting element of the second optocoupler, and the second pin of the second optocoupler The first pin of the light-emitting element is connected to the system power supply of the main controller, the first pin of the light-receiving element of the second optocoupler is grounded, and the second pin of the light-receiving element of the second optocoupler is connected to the The coil negative terminal of the export relay is connected;

The negative coil end of the outlet relay is used as the second side of the control end of the outlet relay, the positive coil end of the outlet relay is used as the first side of the control end of the outlet relay, and the positive coil end of the outlet relay is connected to the first side of the outlet relay respectively. The second pin of the first light receiving element of the second outlet power relay is connected to the second pin of the second light receiving element of the second outlet power relay.

Preferably, it also includes: a diode and a fifth resistor;

The first end of the diode is connected to the coil negative end of the first outlet power relay, the second end of the diode is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to The positive terminals of the coils of the first outlet power relay are connected.

Preferably, the main controller is specifically: a central processing unit CPU including a digital signal processor DSP and an ARM.

Preferably, the CPU including DSP and ARM is specifically OMAPL138 chip.

Preferably, the locking controller is specifically: a Cortex-M3 single-chip microcomputer.

Preferably, the Cortex-M3 single-chip microcomputer is specifically: a Cortex-M3 single-chip microcomputer of the LPC17XX series.

Preferably, the first optocoupler is specifically a TLP785 optocoupler;

The second optocoupler is specifically a TLP785 optocoupler;

The first outlet power relay is specifically: Panasonic DSP1-DC24V relay;

The second outlet power relay is specifically: an AQW21x chip.

Compared with the prior art, the beneficial effects of the present application are:

In this application, when the main controller determines that the system to which the main controller belongs is operating normally and the blocking controller is working normally, it controls the first outlet power relay to be turned on; When the system to which the main controller belongs is running normally and the main controller is working normally, the second outlet power relay is controlled to be turned on, so if the main controller is abnormal, the blocking controller will not control the second outlet power relay conduction, when any one of the first outlet power relay and the second outlet power relay is not conducting, the outlet relay cannot be connected to the outlet relay power supply.

Because when the first outlet power relay is turned on and the second outlet power relay is turned on, the main controller will control the outlet relay to output the corresponding signal, and when the main controller is abnormal, the outlet relay will It will not be connected to the outlet relay power supply, so even if the main controller sends a wrong control command, the outlet relay will not act, which prevents the main controller from outputting wrong signals to external devices through the outlet relay, and reduces the risk of the main controller controlling the outlet. The probability of the relay outputting the wrong signal improves the stability of the power system.

Moreover, the main controller also judges whether the blocking controller is working normally. When it is judged that the blocking controller is working normally and the system to which the main controller belongs is operating normally, it will control the first outlet power relay to be turned on, thereby avoiding the failure of the blocking controller. When the controller is working abnormally and cannot detect whether the main controller is working normally, the main controller is abnormal and outputs wrong control commands, which further prevents the main controller from outputting wrong signals to external devices through the outlet relay, reducing the main controller. The controller controls the probability of the output relay outputting the wrong signal, which improves the stability of the power system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a kind of hardware implementation schematic diagram of the relay protection exit blocking circuit provided by the present application;

Fig. 2 is another kind of hardware implementation schematic diagram of the relay protection outlet blocking circuit provided by the present application;

Fig. 3 is a kind of specific hardware schematic diagram of the relay protection outlet blocking circuit provided by the present application;

Fig. 4 is another specific hardware schematic diagram of the relay protection exit blocking circuit provided by the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Embodiment one

Please refer to Fig. 1, which shows a schematic diagram of the hardware implementation of the relay protection exit blocking circuit provided by the present application. The relay protection exit blocking circuit includes: a main controller U1, a blocking controller U2, a first exit power relay U3, a second Two outlet power relay U4 and outlet relay CJ1.

In this embodiment, the main controller U1 is connected to the locking controller U2 and the first side of the control terminal of the first outlet power relay U3 respectively.

The second side of the control terminal of the first outlet power relay U3 is connected to the outlet relay power supply, the first node of the first outlet power relay U3 is connected to the outlet relay power supply VCC, and the second side of the first outlet power relay U3 The node is connected to the node of the second outlet power supply relay U4.

The control end of the second outlet power relay U4 is connected to the locking controller U2 and the system power supply VDD1 of the locking controller respectively, and the node of the second outlet power relay U4 is connected to the control end of the outlet relay CJ1 The first side is connected.

The second side of the control end of the outlet relay CJ1 is connected to the main controller U1.

When the main controller U1 determines that the system to which the main controller U1 belongs is operating normally and that the locking controller U2 is working normally, it controls the first outlet power relay U3 to be turned on; When the system to which the main controller U1 belongs is running normally and the main controller U1 is working normally, control the second outlet power relay U4 to be turned on; when the first outlet power relay U3 is turned on and the second outlet When the outlet power relay U4 is turned on, the main controller U1 controls the outlet relay CJ1 to output corresponding signals.

In this embodiment, both the main controller U1 and the blocking controller U2 will collect relevant information of the system to which the main controller U1 belongs, such as power supplies at all levels of the system, protection AC volume, important input and output signals, etc., the main controller When U1 and the blocking controller U2 respectively collect information about the system to which the main controller U1 belongs, they will run their respective logics to determine whether the system to which the main controller U1 belongs is abnormal. In addition, real-time communication is performed between the main controller U1 and the blocking controller U2, so as to be able to judge in real time whether the other party is working normally.

The real-time communication between the main controller U1 and the blocking controller U2, and the process of judging whether the other party is working in real time can be as follows: if there is a problem with one controller, the communication between the two will be interrupted or abnormal. Whether the communication between them is interrupted or not normal to judge whether the controller of the other party is working normally.

Embodiment two

In this embodiment, another kind of relay protection exit blocking circuit is expanded on the basis of the relay protection exit blocking circuit shown in the first embodiment, please refer to Fig. 2, which shows the relay protection provided by this application Another schematic diagram of hardware implementation of the exit blocking circuit, on the basis of the relay protection exit blocking circuit shown in the first embodiment, further includes: a first control circuit 11 , a second control circuit 12 and a third control circuit 13 .

The first input terminal of the first control circuit 11 is connected to the main controller U1, the second input terminal of the first control circuit 11 is connected to the system power supply VDD2 of the main controller, and the first control circuit The first output end of the circuit 11 is connected to the first side of the control end of the first outlet power relay U3, and the second output end of the first control circuit 11 is grounded.

The second control circuit 12 is connected to the second outlet power relay U4.

The first input end of the third control circuit 13 is connected to the main controller U1, the second input end of the third control circuit 13 is connected to the system power supply VDD2 of the main controller, and the third control circuit The first output end of the circuit 13 is grounded, and the second output end of the third control circuit 13 is connected to the second side of the control end of the outlet relay CJ1.

In this embodiment, the first outlet power relay U3 may be, but not limited to, an electromagnetic relay; the second outlet power relay U4 may be, but not limited to, an optical relay; the outlet relay CJ1 may be, but not limited to, an electromagnetic relay.

In Embodiment 2, when the first outlet power relay is an electromagnetic relay, the second outlet power relay is a photorelay, and the outlet relay is an electromagnetic relay, please refer to the specific hardware schematic diagram of the relay protection outlet blocking circuit. Referring to Figure 3, the specific hardware implementation of the relay protection exit blocking circuit is as follows:

The first control circuit 11 includes: a first resistor R1 and a first optocoupler OP1.

The first terminal of the first resistor R1 is used as the first input terminal of the first control circuit 11 and is connected to the main controller U1, and the second terminal of the first resistor R1 is connected to the first optocoupler The second pin 2 of the light emitting element of OP1 is connected.

The first pin 1 of the light-emitting element of the first optocoupler OP1 is connected to the system power supply VDD2 of the main controller, the first pin 3 of the light-receiving element of the first optocoupler OP1 is grounded, and the first The second pin 4 of the light receiving element of the optocoupler OP1 is connected to the coil negative terminal 16 of the first outlet power relay U3.

The first pin 3 of the light-receiving element of the first optocoupler OP1 serves as the second output end of the first control circuit 11, and the second pin 4 of the light-receiving element of the first optocoupler OP1 serves as the first A first output terminal of the control circuit 11 .

The coil negative terminal 16 of the first outlet power relay U3 serves as the first side of the control terminal of the first outlet power relay U3, and the coil positive terminal 1 of the first outlet power relay U3 serves as the first outlet power relay On the second side of the control terminal of U3, the first node of the first outlet power relay U3 includes a first input pin 8 and a second input pin 9 .

Both the first input pin 8 and the second input pin 9 of the first node of the first outlet power supply relay U3 are connected to the outlet relay power supply VCC, and the coil positive terminal 1 of the first outlet power supply relay U3 is also connected to the outlet relay power supply VCC .

The second control circuit 12 includes: a second resistor R2 and a third resistor R3.

The first end of the second resistor R2 is connected to the first pin 1 of the first light-emitting element of the second outlet power relay U4, and the second end of the second resistor R2 is connected to the system of the locking controller. The power supply VDD1 is connected, and the second pin 2 of the first light-emitting element of the second outlet power relay U4 is connected with the blocking controller U2.

The first end of the third resistor R3 is connected to the first pin 3 of the second light-emitting element of the second outlet power relay U4, and the second end of the third resistor R3 is connected to the system of the locking controller. The power supply VDD1 is connected, and the second pin 4 of the second light-emitting element of the second outlet power relay U4 is connected with the blocking controller U2.

The first pin 1 and the second pin 2 of the first light-emitting element of the second outlet power relay U4 and the first pin 3 and the second pin of the second light-emitting element of the second outlet power relay U4 4 As the control terminal of the second outlet power supply relay U4, the common ends of the first output pin 5 and the second output pin 12 included in the second node of the first outlet power supply relay U3 are respectively connected to the first outlet power supply relay U4 The first pin 8 of the first light receiving element of the second outlet power relay U4 is connected to the first pin 6 of the second light receiving element of the second outlet power relay U4.

The third control circuit 13 includes: a fourth resistor R4 and a second optocoupler OP2.

The first end of the fourth resistor R4 is connected to the main controller U1, and the second end of the fourth resistor R4 is connected to the second pin 2 of the light-emitting element of the second optocoupler OP2. The first pin 1 of the light-emitting element of the second optocoupler OP2 is connected to the system power supply VDD2 of the main controller, the first pin 3 of the light-receiving element of the second optocoupler OP2 is grounded, and the second optocoupler The second pin 4 of the light receiving element of OP2 is connected with the coil negative terminal 16 of the outlet relay CJ1.

The first pin 3 of the light receiving element of the second optocoupler OP2 serves as the first output end of the third control circuit 13, and the second pin 4 of the light receiving element of the second optocoupler OP2 serves as the first output terminal of the third control circuit 13. The second output terminal of the three control circuit 13.

The negative coil terminal 16 of the outlet relay CJ1 is used as the second side of the control terminal of the outlet relay CJ1, and the positive coil terminal 1 of the outlet relay CJ1 is used as the first side of the control terminal of the outlet relay CJ1. The positive coil terminal 1 of CJ1 is respectively connected to the second pin 7 of the first light receiving element of the second outlet power relay U4 and the second pin 5 of the second light receiving element of the second outlet power relay U4.

When both the first outlet power relay U3 and the second outlet power relay U4 are turned on, the second pin 7 of the first light-receiving element of the second outlet power relay U4 and the second light-receiving element of the second outlet power relay U4 The second pin 5 provides the outlet relay power VCC to the outlet relay CJ1 as the working power of the outlet relay CJ1.

In the relay protection outlet blocking circuit shown in Figure 3, when the blocking controller U2 judges that the system to which the main controller U1 belongs is operating normally and the main controller U1 is working normally, it outputs a low level, because the second The first pin 1 of the first light-emitting element of the outlet power relay U4 is pulled up by the second resistor R2, and the first pin 3 of the second light-emitting element of the second outlet power relay U4 is pulled up by the third resistor R3, so the first The input circuit of the two-outlet power supply relay U4 starts to work, and the first pin 8 and the second pin 7 of the first light-receiving element conduct with the first pin 6 and the second pin 5 of the second light-receiving element. When the blocking controller U2 judges that the system to which the main controller U1 belongs is not operating normally or that the main controller U1 is not working normally, it outputs a high level, the input circuit of the second outlet power relay U4 stops working, and the first light receiving element The first pin 8 and the second pin 7 of the second light-receiving element are disconnected from the first pin 6 and the second pin 5 of the second light-receiving element, and the working power of the outlet relay CJ1 coil is cut off.

When the main controller U1 judges that the system to which the main controller U1 belongs is operating normally and that the locking controller U2 is working normally, the main controller U1 outputs a low level, and the input circuit of the first optocoupler OP1 is turned on, so that the second The first pin 3 and the second pin 4 of the light-receiving element of an optocoupler OP1 are connected. At this time, the coil of the first outlet power relay U3 is connected and current flows, the first outlet power relay U3 operates, and the outlet The relay power supply VCC is connected to the first pin 8 of the first light-receiving element of the second outlet power relay U4 and the first pin 6 of the second light-receiving element of the second outlet power relay U4. When U4 is turned on, the outlet relay CJ1 and the outlet relay power supply VCC are turned on; when the main controller U1 judges that the system to which the main controller U1 belongs is not operating normally or that the locking controller U2 is not working normally, the main controller U1 Output high level, the input circuit of the first optocoupler OP1 is cut off, the resistance between the first pin 3 and the second pin 4 of the light receiving element of the first optocoupler OP1 becomes infinite, and the first outlet power relay U3 The current of the coil is 0, and the outlet relay power supply VCC is disconnected from the outlet relay CJ1.

As shown in FIG. 3 , the pin 8 and pin 9 of the first node of the outlet relay CJ1 and the pin 5 and pin 12 of the second node implement an outlet, that is, output signals to the outside.

On the basis of the relay protection exit blocking circuit shown in FIG. 3 , it may further include: a diode D1 and a fifth resistor R5 , as shown in FIG. 4 .

The first end of the diode D1 is connected to the coil negative end 16 of the first outlet power relay U3, the second end of the diode D1 is connected to the first end of the fifth resistor R5, and the fifth resistor The second terminal of R5 is connected with the coil positive terminal 1 of the first outlet power relay U3.

In this application, the function of the fifth resistor R5 is to limit the current and prevent the coil of the first outlet power relay U3 from burning out when it is connected between the outlet relay power supply VCC and the ground alone. The function of diode D1 is: when the coil of the first outlet power relay U3 is powered off, because the coil is an inductance, a back electromotive force will be generated. If there is no diode D1, the back electromotive force will damage the first optocoupler OP1 connected to the coil. After the diode D1 is added, the reverse current flows through the diode and then flows back to the coil to prevent damage to the first optocoupler OP1 connected to the coil.

In Embodiment 1 and Embodiment 2, the main controller U1 is specifically: a CPU (Central Processing Unit, central processing unit) including DSP (digital signal processing, digital signal processor) and ARM (Advanced RISC Machines).

Of course, the CPU including DSP and ARM can be but not limited to OMAPL138 chip

In Embodiment 1 and Embodiment 2, the locking controller U2 is specifically: a Cortex-M3 single-chip microcomputer.

Certainly, the Cortex-M3 single-chip microcomputer may specifically be but not limited to: a Cortex-M3 single-chip microcomputer of the LPC17XX series.

In Embodiment 1 and Embodiment 2, the first optocoupler OP1 is specifically a TLP785 optocoupler;

The second optocoupler OP2 is specifically a TLP785 optocoupler;

The first outlet power supply relay U3 is specifically: Panasonic DSP1-DC24V relay;

The second outlet power relay U4 is specifically an AQW21x chip.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device-type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to part of the description of the method embodiments.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present application, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

It can be known from the above description of the implementation manners that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the essence of the technical solution of this application or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , CD, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments of the present application.

The above provides a detailed introduction to a relay protection exit blocking circuit provided by the application. In this paper, specific examples are used to illustrate the principle and implementation of the application. The description of the above embodiment is only used to help understand the application. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. Application Restrictions.

Claims (10)

1. A relay protection outlet blocking circuit is characterized in that it comprises a main controller, a blocking controller, a first outlet power relay, a second outlet power relay and an outlet relay; The main controller is respectively connected to the first side of the control terminal of the locking controller and the first outlet power relay; The second side of the control end of the first outlet power relay is connected to the outlet relay power supply, the first node of the first outlet power relay is connected to the outlet relay power supply, and the second node of the first outlet power relay is connected to the outlet relay power supply. The nodes of the second outlet power relay are connected; The control terminal of the second outlet power relay is connected to the locking controller and the system power supply of the locking controller respectively, and the node of the second outlet power relay is connected to the first side of the control terminal of the outlet relay; The second side of the control end of the outlet relay is connected to the main controller; When the main controller determines that the system to which the main controller belongs is operating normally and that the blocking controller is working normally, it controls the first outlet power relay to be turned on; when the blocking controller determines that the main control When the system to which the device belongs is running normally and the main controller is working normally, control the second outlet power relay to be turned on; when the first outlet power relay is on and the second outlet power relay is on, the The main controller controls the outlet relay to output corresponding signals. 2. The relay protection exit blocking circuit according to claim 1, further comprising: a first control circuit, a second control circuit and a third control circuit; The first input end of the first control circuit is connected to the main controller, the second input end of the first control circuit is connected to the system power supply of the main controller, and the first control circuit first The output terminal is connected to the first side of the control terminal of the first outlet power relay, and the second output terminal of the first control circuit is grounded; The second control circuit is connected to the second outlet power relay; The first input end of the third control circuit is connected to the main controller, the second input end of the third control circuit is connected to the system power supply of the main controller, and the first input end of the third control circuit The output end is grounded, and the second output end of the third control circuit is connected to the second side of the control end of the outlet relay. 3. The relay protection exit blocking circuit according to claim 2, wherein the first exit power relay is an electromagnetic relay, the second exit power relay is a photorelay, and the exit relay is an electromagnetic relay. 4. The relay protection exit blocking circuit according to claim 3, wherein the first control circuit comprises: a first resistor and a first optocoupler; The first end of the first resistor is connected to the main controller as the first input end of the first control circuit, and the second end of the first resistor is connected to the light-emitting element of the first optocoupler. The second pin is connected; The first pin of the light-emitting element of the first optocoupler is connected to the system power supply of the main controller, the first pin of the light-receiving element of the first optocoupler is grounded, and the light-receiving element of the first optocoupler The second pin is connected to the coil negative end of the first outlet power relay; The negative coil terminal of the first outlet power relay is used as the first side of the control terminal of the first outlet power relay, and the positive coil end of the first outlet power relay is used as the second control terminal of the first outlet power relay. On the side, the first node of the first outlet power relay includes a first input pin and a second input pin; The second control circuit includes: a second resistor and a third resistor; The first end of the second resistor is connected to the first pin of the first light-emitting element of the second outlet power relay, and the second end of the second resistor is connected to the system power supply of the locking controller, so The second pin of the first light-emitting element of the second outlet power relay is connected to the locking controller; The first end of the third resistor is connected to the first pin of the second light-emitting element of the second outlet power relay, and the second end of the third resistor is connected to the system power supply of the locking controller, so The second pin of the second light-emitting element of the second outlet power relay is connected to the locking controller; The first pin and the second pin of the first light-emitting element of the second outlet power relay and the first pin and the second pin of the second light-emitting element of the second outlet power relay serve as the second The control end of the outlet power relay, the common end of the first output pin and the second output pin included in the second node of the first outlet power relay, respectively connected to the first light-receiving element of the second outlet power relay The first pin of the second outlet power supply relay is connected to the first pin of the second light-receiving element; The third control circuit includes: a fourth resistor and a second optocoupler; The first end of the fourth resistor is connected to the main controller, the second end of the fourth resistor is connected to the second pin of the light-emitting element of the second optocoupler, and the second pin of the second optocoupler The first pin of the light-emitting element is connected to the system power supply of the main controller, the first pin of the light-receiving element of the second optocoupler is grounded, and the second pin of the light-receiving element of the second optocoupler is connected to the The coil negative terminal of the export relay is connected; The negative coil end of the outlet relay is used as the second side of the control end of the outlet relay, the positive coil end of the outlet relay is used as the first side of the control end of the outlet relay, and the positive coil end of the outlet relay is connected to the first side of the outlet relay respectively. The second pin of the first light receiving element of the second outlet power relay is connected to the second pin of the second light receiving element of the second outlet power relay. 5. The relay protection exit blocking circuit according to claim 4, further comprising: a diode and a fifth resistor; The first end of the diode is connected to the coil negative end of the first outlet power relay, the second end of the diode is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to The positive terminals of the coils of the first outlet power relay are connected. 6. The relay protection exit blocking circuit according to any one of claims 1-5, characterized in that, the main controller is specifically: a central processing unit (CPU) including a digital signal processor (DSP) and an ARM. 7. The relay protection exit blocking circuit according to claim 6, characterized in that, the CPU comprising DSP and ARM is specifically an OMAPL138 chip. 8. The relay protection exit blocking circuit according to any one of claims 1-5, wherein the blocking controller is specifically a Cortex-M3 single-chip microcomputer. 9. The relay protection exit blocking circuit according to claim 8, wherein the Cortex-M3 single-chip microcomputer is specifically: a Cortex-M3 single-chip microcomputer of the LPC17XX series. 10. The relay protection exit blocking circuit according to any one of claims 1-5, wherein the first optocoupler is specifically a TLP785 optocoupler; The second optocoupler is specifically a TLP785 optocoupler; The first outlet power relay is specifically: Panasonic DSP1-DC24V relay; The second outlet power relay is specifically: an AQW21x chip.