Functional safety circuit and system

Abstract

The invention relates to the technical field of circuit protection, particularly provides a functional safety circuit and system, and aims to solve the technical problem that key functions of an automobile cannot run normally due to the fact that a limping mode cannot be triggered after an electronic control system is damaged. In order to achieve the purpose, the functional safety circuit and system provided by the invention comprise a monitoring module which is used for generating a first control signal and a second control signal when a control module is determined to have a fault; the driving module is used for generating a third control signal according to the first control signal and the second control signal; the self-locking control module is used for generating a fourth control signal according to the first control signal; the self-locking module is used for generating a fifth control signal according to the fourth control signal and the second control signal; and the functional module is used for driving the functional module according to the third control signal and the fifth control signal.

Description

Technical Field

[0001] The present application relates to the field of circuit protection technology, and in particular to a functional safety circuit and system. Background Art

[0002] The electronic control system of a car is generally composed of sensors, electronic control units and execution structures. When the car starts, the sensors in the electronic control system obtain data and transmit the data to the electronic control system. The electronic control system sends instructions to the execution structure based on the data, and the execution structure implements a certain function based on the instructions.

[0003] When a vehicle fails, the execution structure cannot receive the instructions sent by the electronic control unit, resulting in the execution structure not being able to operate normally. For example, after a vehicle is involved in a traffic accident, the windshield wipers need to be in the on state.

[0004] In the prior art, when a vehicle fails, the electronic control system triggers the limp home mode to ensure that the execution structure of the vehicle can still perform certain actions. In the limp home mode, a high-level signal is generated by the hardware circuit, and the high-level signal can control the execution structure so that the execution structure can implement the key functions of the vehicle. However, when the electronic control system is damaged, the limp home mode cannot be triggered, resulting in a technical problem that the key functions of the vehicle cannot operate normally.

[0005] Accordingly, the art needs a new functional safety circuit to solve the above problems. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the present application is proposed to solve or at least partially solve the technical problem that when the electronic control system is damaged, the limp home mode cannot be triggered, thereby causing the execution structure to fail to operate normally.

[0007] In a first aspect, a functional safety circuit is provided, comprising: a driving module 11, a self-locking module 12, a self-locking control module 13, a control module 14, a functional module 15 and a monitoring module 16, wherein:

[0008] The monitoring module 16 is used to generate a first control signal and a second control signal when it is determined that the control module 14 fails;

[0009] The driving module 11 is used to generate a third control signal according to the first control signal and the second control signal;

[0010] The self-locking control module 13 is used to generate a fourth control signal according to the first control signal;

[0011] The self-locking module 12 is used to generate a fifth control signal according to the fourth control signal and the second control signal;

[0012] The functional module 15 is used to drive the functional module 15 according to the third control signal and the fifth control signal.

[0013] In one of the above technical solutions, the driving module 11 includes: a first input terminal 111, a second input terminal 112, a first diode 113, a second diode 114, a first switch module 115 and a first output terminal 116, wherein:

[0014] The first input terminal 111 is connected to the anode of the first diode 113;

[0015] The second input terminal 112 is connected to the anode of the second diode 114;

[0016] After the first input terminal 111, the first diode 113, the second input terminal 112 and the second diode 114 are connected, they are connected to the first switch module 115;

[0017] The first output terminal 116 is connected to the first switch module 115 .

[0018] In one of the above technical solutions, the first switch module 115 includes: a first resistor 117 and a first voltage switch 118, wherein:

[0019] One end of the first resistor 117 is connected to the control end of the first voltage switch 118;

[0020] The other end of the first resistor 117 is connected to the first end of the first voltage switch 118;

[0021] A second terminal of the first voltage switch 118 is connected to the first output terminal 116 .

[0022] In one of the above technical solutions, the self-locking module 12 includes: a third input terminal 120, a second switch module 121, a third diode 122, a fourth diode 123, a second resistor 124, a second output terminal 125 and a fourth input terminal 126, wherein:

[0023] The anode of the fourth diode 123 is connected to the second resistor 124;

[0024] After the third input terminal 120 is connected to the anode of the third diode 122, it is connected to the fourth diode 123 and the second resistor 124;

[0025] After the third input terminal 120, the third diode 122, the fourth diode 123 and the second resistor 124 are connected, they are connected to the second switch module 121;

[0026] The second switch module 121 is connected to the second output terminal 125;

[0027] An anode of the fourth diode 123 is connected to the fourth input terminal 126 .

[0028] In one of the above technical solutions, the second switch module 121 includes: a first transistor 1211, a second transistor 1212, a first power supply 1213, a third resistor 1214, a fourth resistor 1215 and a fifth resistor 1216, wherein:

[0029] The control end of the first transistor 1211 is connected to the cathode of the third diode 122 and the cathode of the fourth diode 123;

[0030] A first terminal of the first transistor 1211 is grounded, and a second terminal of the first transistor 1211 is connected to a third resistor 1214;

[0031] The third resistor 1214 is connected to the control terminal of the second transistor 1212;

[0032] The third resistor 1214 is connected to the fourth resistor 1215;

[0033] A first end of the second transistor 1212 is connected to the first power source 1213 and the fourth resistor 1215 , and a second end of the second transistor 1212 is connected to the second resistor 124 .

[0034] In one of the above technical solutions, the self-locking control module 13 includes: a fifth input terminal 131, a fifth diode 132, an RC module 133, a second voltage switch 134 and a third output terminal 135, wherein:

[0035] The fifth input terminal 131 is connected to the anode of the fifth diode 132;

[0036] The cathode of the fifth diode 132 is connected to the RC module 133;

[0037] The control end of the second voltage switch 134 is connected to the RC module 133 , the first end of the second voltage switch 134 is grounded, and the second end of the second voltage switch 134 is connected to the third output end 135 .

[0038] In one of the above technical solutions, the RC module 133 includes: a sixth resistor 1331 and a capacitor 1332, wherein:

[0039] The sixth resistor 1331 is connected to the capacitor 1332 .

[0040] In one of the above technical solutions, the first transistor and the second transistor include:

[0041] The first transistor 1211 is an NPN type triode;

[0042] The second transistor 1212 is a PNP transistor.

[0043] In one of the above technical solutions, the functional module 15 includes: a sixth diode 151, a seventh diode 152, a seventh resistor 153, a load 154, a third voltage switch 155, a second power supply 156 and a sixth input terminal 157, wherein:

[0044] The sixth input terminal 157 is connected to the anode of the sixth diode 151;

[0045] After the cathode of the sixth diode 151 is connected to the cathode of the seventh diode 152, it is connected to the control end of the third voltage switch 155;

[0046] One end of the seventh resistor 153 is connected to the control end of the third voltage switch 155;

[0047] The other end of the seventh resistor 153 is connected to the load 154 and the first end of the third voltage switch 155;

[0048] A second end of the third voltage switch 155 is connected to the second power source 156 .

[0049] In a second aspect, the present application provides an electronic system, comprising the functional safety circuit described in any one of the first aspects.

[0050] The present application provides a functional safety circuit and system, and the protection circuit of the low voltage difference linear regulator is specifically as follows: the functional safety circuit includes a driving module 11, a self-locking module 12, a self-locking control module 13, a control module 14, a functional module 15 and a monitoring module 16, wherein the monitoring module 16 is used to generate a first control signal and a second control signal when it is determined that the control module 14 fails; the driving module 11 is used to generate a third control signal according to the first control signal and the second control signal; the self-locking control module 13 is used to generate a fourth control signal according to the first control signal; the self-locking module 12 is used to generate a fifth control signal according to the fourth control signal and the second control signal; the functional module 15 is used to drive the functional module 15 according to the third control signal and the fifth control signal, thereby ensuring that key functions can operate normally after a failure of the electronic control system occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Among them:

[0052] Figure 1 A schematic diagram of the circuit structure of a first embodiment of a functional safety circuit provided in the present application;

[0053] Figure 2 A schematic diagram of the circuit structure of a second functional safety circuit embodiment provided in the present application;

[0054] Figure 3 A schematic diagram of the circuit structure of a third functional safety circuit embodiment provided in the present application;

[0055] Figure 4 A schematic diagram of the circuit structure of a fourth embodiment of a functional safety circuit provided in the present application;

[0056] Figure 5 A schematic diagram of the circuit structure of a fifth functional safety circuit embodiment provided in the present application;

[0057] Figure 6 This is a schematic diagram of the circuit structure of a sixth embodiment of a functional safety circuit provided in the present application.

[0058] Reference numerals:

[0059] 11: driving module; 12: self-locking module; 13: self-locking control module; 14: control module; 15: function module; 16: monitoring module; 111: first input terminal; 112: second input terminal; 113: first diode; 114: second diode; 115: first switch module; 116: first output terminal; 117: first resistor; 118: first voltage switch; 120: third input terminal; 121: second switch module; 122: third diode; 123: fourth diode; 124: second resistor; 125: second output terminal; 126: fourth output terminal Input terminal; 1211: first transistor; 1212: second transistor; 1213: first power supply; 1214: third resistor; 1215: fourth resistor; 1216: fifth resistor; 131: fifth input terminal; 132: fifth diode; 133: RC module; 134: second voltage switch; 135: third output terminal; 1331: sixth resistor; 1332: capacitor; 151: sixth diode; 152: seventh diode; 153: seventh resistor; 154: load; 155: third voltage switch; 156: second power supply; 157: sixth input terminal. DETAILED DESCRIPTION

[0060] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0061] In the description of the present application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B or A and B. The singular terms "one" and "the" may also include plural forms.

[0062] See attached Figure 1 , Figure 1 This is a circuit structure diagram of a functional safety circuit embodiment 1 provided in this application. Figure 1 As shown, a functional safety circuit in an embodiment of the present application mainly includes:

[0063] In this embodiment, the functional safety circuit includes: a driving module 11 , a self-locking module 12 , a self-locking control module 13 , a control module 14 , a functional module 15 and a monitoring module 16 .

[0064] In this embodiment, the monitoring module 16 is used to generate a first control signal and a second control signal when it is determined that the control module 14 fails; the driving module 11 is used to generate a third control signal based on the first control signal and the second control signal; the self-locking control module 13 is used to generate a fourth control signal based on the first control signal; the self-locking module 12 is used to generate a fifth control signal based on the fourth control signal and the second control signal; the functional module 15 is used to drive the functional module 15 based on the third control signal and the fifth control signal.

[0065] In this embodiment, when the control module 14 of the vehicle fails, the functional module 15 cannot receive the instructions sent by the control module 14, and thus the functional module 15 cannot operate normally. In order to ensure the normal operation of the functional module 15, the monitoring module 16 monitors the control module 14 in real time, and after determining that the control module 14 fails, generates a first control signal and a second control signal, and then the driving module 11 generates a third control signal according to the first control signal and the second control signal, and the self-locking control module 13 generates a fourth control signal according to the first control signal. In addition, the self-locking module 12 generates a fifth control signal according to the fourth control signal and the second control signal. Finally, the functional module 15 drives the functional module 15 according to the third control signal and the fifth control signal, thereby ensuring that the functional module 15 can operate normally after the control module 14 fails.

[0066] See attached Figure 2 , Figure 2 This is a circuit structure diagram of a second functional safety circuit embodiment provided by the present application. Figure 2 As shown, the driving module 11 specifically includes:

[0067] In this embodiment, the driving module 11 mainly includes: a first input terminal 111 , a second input terminal 112 , a first diode 113 , a second diode 114 , a first switch module 115 and a first output terminal 116 .

[0068] In this embodiment, the first input terminal 111 is connected in series with the anode of the first diode 113, and the second input terminal 112 is connected in series with the anode of the second diode 114. After the first input terminal 111, the first diode 113, the second input terminal 112 and the second diode 114 are connected, they are connected to the first switch module 115, and the first output terminal 116 is connected to the first switch module 115.

[0069] In this embodiment, the first switch module 115 includes a first resistor 117 and a first voltage switch 118 .

[0070] In this embodiment, one end of the first resistor 117 is connected to the control end of the first voltage switch 118 , the other end of the first resistor 117 is connected to the first end of the first voltage switch 118 , and the second end of the first voltage switch 118 is connected to the first output end 116 .

[0071] In this embodiment, the first input terminal 111 is connected to the anode of the first diode 113, and the second input terminal 112 is connected to the anode of the second diode 114. After the first input terminal 111, the first diode 113, the second input terminal 112 and the second diode 114 are connected, they are connected to the first switch module 115, and the first output terminal 116 is connected to the first switch module 115, wherein one end of the first resistor 117 in the first switch module 115 is connected to the control end of the first voltage switch 118, the other end of the first resistor 117 is connected to the first end of the first voltage switch 118, and the second end of the first voltage switch 118 is connected to the first output terminal 116, so that when the first control signal and the second control signal are both high levels, the first voltage switch 118 is turned on, and when the first control signal and the second control signal are both low levels, the first voltage switch 118 is turned off.

[0072] See attached Figure 3 , Figure 3 This is a circuit structure diagram of a third functional safety circuit embodiment provided by this application. Figure 3 As shown, a self-locking module 12 in a functional safety circuit in an embodiment of the present application includes: in this embodiment, the self-locking module 12 includes a third input terminal 120, a second switch module 121, a third diode 122, a fourth diode 123, a second resistor 124, a second output terminal 125 and a fourth input terminal 126.

[0073] In this embodiment, the anode of the fourth diode 123 is connected to the second resistor 124. After the third input terminal 120 is connected to the anode of the third diode 122, it is connected to the fourth diode 123 and the second resistor 124. After the third input terminal 120, the third diode 122, the fourth diode 123 and the second resistor 124 are connected, they are connected to the second switch module 121. The second switch module 121 is connected to the second output terminal 125, and the anode of the fourth diode 123 is connected to the fourth input terminal 126.

[0074] In this embodiment, the second switch module 121 includes: a first transistor 1211 , a second transistor 1212 , a first power source 1213 , a third resistor 1214 , a fourth resistor 1215 and a fifth resistor 1216 .

[0075] In this embodiment, the control end of the first transistor 1211 is connected to the cathode of the third diode 122 and the cathode of the fourth diode 123, the first end of the first transistor 1211 is grounded, the second end of the first transistor 1211 is connected to the third resistor 1214, the third resistor 1214 is connected to the control end of the second transistor 1212, the third resistor 1214 is connected to the fourth resistor 1215, the first end of the second transistor 1212 is connected to the first power supply 1213 and the fourth resistor 1215, and the second end of the second transistor 1212 is connected to the second resistor 124.

[0076] In this embodiment, for example, the first transistor 1211 is an NPN transistor, and the second transistor 1212 is a PNP transistor.

[0077] In this embodiment, the anode of the fourth diode 123 is connected to the second resistor 124, the third input terminal 120 is connected to the anode of the third diode 122, and then connected to the fourth diode 123 and the second resistor 124, the third input terminal 120, the third diode 122, the fourth diode 123 and the second resistor 124 are connected, and then connected to the second switch module 121, the second switch module 121 is connected to the second output terminal 125, the anode of the fourth diode 123 is connected to the fourth input terminal 126, wherein in the second switch module 121, the first transistor 1 The control end of 211 is connected to the cathode of the third diode 122 and the cathode of the fourth diode 123, the first end of the first transistor 1211 is grounded, the second end of the first transistor 1211 is connected to the third resistor 1214, the third resistor 1214 is connected to the control end of the second transistor 1212, the third resistor 1214 is connected to the fourth resistor 1215, the first end of the second transistor 1212 is connected to the first power supply 1213 and the fourth resistor 1215, and the second end of the second transistor 1212 is connected to the second resistor 124 to achieve latching of the signal.

[0078] See attached Figure 4 , Figure 4 This is a circuit structure diagram of a fourth embodiment of a functional safety circuit provided by the present application. Figure 4 As shown, a self-locking control module 13 in a functional safety circuit in an embodiment of the present application includes:

[0079] In this embodiment, the self-locking control module 13 includes: a fifth input terminal 131 , a fifth diode 132 , an RC module 133 , a second voltage switch 134 and a third output terminal 135 .

[0080] In this embodiment, the fifth input terminal 131 is connected to the anode of the fifth diode 132, the cathode of the fifth diode 132 is connected to the RC module 133, the control end of the second voltage switch 134 is connected to the RC module 133, the first end of the second voltage switch 134 is grounded, and the second end of the second voltage switch 134 is connected to the third output terminal 135.

[0081] In this embodiment, the RC module 133 includes: a sixth resistor 1331 and a capacitor 1332 .

[0082] In this embodiment, the sixth resistor 1331 and the capacitor 1332 are connected in parallel.

[0083] In this embodiment, the fifth input terminal 131 is connected to the positive electrode of the fifth diode 132, the negative electrode of the fifth diode 132 is connected to the RC module 133, the control end of the second voltage switch 134 is connected to the RC module 133, the first end of the second voltage switch 134 is grounded, and the second end of the second voltage switch 134 is connected to the third output terminal 135, wherein the RC module 133 includes: a sixth resistor 1331 and a capacitor 1332, and the sixth resistor 1331 and the capacitor 1332 are connected in parallel to realize the control of the latching function of the self-locking module 12.

[0084] See attached Figure 5 , Figure 5 This is a circuit structure diagram of a fifth embodiment of a functional safety circuit provided by the present application. Based on the above embodiment, Figure 5 As shown, a functional module 15 in a functional safety circuit in an embodiment of the present application includes:

[0085] In this embodiment, the functional module 15 includes: a sixth diode 151 , a seventh diode 152 , a seventh resistor 153 , a load 154 , a third voltage switch 155 , a second power supply 156 and a sixth input terminal 157 .

[0086] In this embodiment, the sixth input terminal 157 is connected to the positive electrode of the sixth diode 151, and after the negative electrode of the sixth diode 151 is connected to the negative electrode of the seventh diode 152, it is connected to the control end of the third voltage switch 155, one end of the seventh resistor 153 is connected to the control end of the third voltage switch 155, and the other end of the seventh resistor 153 is connected to the load 154 and the first end of the third voltage switch 155, and the second end of the third voltage switch 155 is connected to the second power supply 156.

[0087] In this embodiment, for example, the control module 14 may be a micro control unit.

[0088] In this embodiment, for example, the load 154 may be a wiper motor.

[0089] In this embodiment, the sixth input terminal 157 is connected to the positive electrode of the sixth diode 151, and after the negative electrode of the sixth diode 151 is connected to the negative electrode of the seventh diode 152, it is connected to the control end of the third voltage switch 155, one end of the seventh resistor 153 is connected to the control end of the third voltage switch 155, and the other end of the seventh resistor 153 is connected to the load 154 and the first end of the third voltage switch 155, and the second end of the third voltage switch 155 is connected to the second power supply 156.

[0090] See attached Figure 6 , Figure 6 This is a circuit structure diagram of a sixth embodiment of a functional safety circuit provided by the present application. Figure 6 As shown, a functional safety circuit in an embodiment of the present application mainly includes:

[0091] In this embodiment, the monitoring module 16 includes a fourth output terminal 161 and a fifth output terminal 162 .

[0092] In this embodiment, the fourth output terminal 161 is connected to the second input terminal 112, and the fourth output terminal 161 is connected to the fifth input terminal 131; the fifth output terminal 162 is connected to the first input terminal 111, and the fifth output terminal 162 is connected to the fifth input terminal 131; the first output terminal 116 is connected to the second output terminal 125; the second output terminal 125 is connected to the sixth input terminal 157; the fourth input terminal 126 is connected to the positive electrode of the third output terminal 135; the positive electrode of the seventh diode 152 is connected to the control module 14; the control module 14 is connected to the monitoring module 16.

[0093] In this embodiment, when the control module 14 is powered on normally, the first control signal and the second control signal generated by the monitoring module 16 are both high level. At this time, after the first control signal and the second control signal are input into the driving module 11, the first voltage switch 118 is turned on, and the third control signal output by the driving module 11 is low level. At the same time, after the first control signal is input into the self-locking control module 13, the second voltage switch 134 is turned on, and the fourth control signal output by the self-locking control module 13 is low level. When the second control signal is input into the self-locking module 12, the output fifth control signal is high level. At this time, since the third control signal is low level, the third signal pulls the fifth control signal down to a low level. At this time, the functional module 15 is controlled by the control module 14.

[0094] In this embodiment, when the control module 14 is powered off normally, the first control signal and the second control signal generated by the monitoring module 16 are both low level. At this time, due to the slow discharge of the capacitor 1332 in the self-locking control module 13, the level of the cathode of the fifth diode 132 is reduced to a low level after maintaining a high level for a certain period of time t1, then the second voltage switch 134 is in the off state, and the self-locking module 12 locks the input low level, so that the self-locking module 12 outputs a low level. At the same time, the first control signal and the second control signal input by the driving module 11 are both low level, and the driving module 11 outputs a low level. Therefore, when the third control signal and the fifth control signal are both low level, the functional module 15 is controlled by the control module 14. At the same time, since the logical relationship between the first control signal and the second control signal is or, the first voltage switch 118 is always in the on state during the process of maintaining the high level of the first control signal, so that the self-locking module 12 outputs a low level.

[0095] In this embodiment, when the monitoring module 16 determines that the control module 14 fails at time t0, the first control signal is reduced from a high level to a low level at time t0, and the second control signal is reduced from a high level to a low level after time t1. Since the capacitor 1332 in the self-locking control module 13 discharges slowly, the level of the cathode of the fifth diode 132 is reduced to a low level after maintaining a high level for a certain period of time t2, then the second voltage switch 134 is in the off state, and the self-locking module 12 locks the input high level, so that the self-locking module 12 outputs a high level, and the driving module 11 becomes a low level at t2, and the first voltage switch 118 is in the off state, so the driving module 11 outputs a high level. When the three control signals and the fifth control signal are all high levels, the driving function module 15 is operated to ensure the normal operation of the function module when the control module fails.

[0096] Correspondingly, this embodiment also provides an electronic system, including the above-mentioned functional safety circuit.

[0097] So far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A functional safety circuit, characterized in that: include: The drive module 11, the self-locking module 12, the self-locking control module 13, the control module 14, the function module 15 and the monitoring module 16, wherein: The monitoring module 16 is used to generate a first control signal and a second control signal when it is determined that the control module 14 fails; The driving module 11 is used to generate a third control signal according to the first control signal and the second control signal; The self-locking control module 13 is used to generate a fourth control signal according to the first control signal; The self-locking module 12 is used to generate a fifth control signal according to the fourth control signal and the second control signal; The functional module 15 is used to drive the functional module 15 according to the third control signal and the fifth control signal.

2. A functional safety circuit according to claim 1, characterized in that: The driving module 11 includes: a first input terminal 111, a second input terminal 112, a first diode 113, a second diode 114, a first switch module 115 and a first output terminal 116, wherein: The first input terminal 111 is connected to the anode of the first diode 113; The second input terminal 112 is connected to the anode of the second diode 114; After the first input terminal 111, the first diode 113, the second input terminal 112 and the second diode 114 are connected, they are connected to the first switch module 115; The first output terminal 116 is connected to the first switch module 115 .

3. A functional safety circuit according to claim 2, characterized in that: The first switch module 115 includes: a first resistor 117 and a first voltage switch 118, wherein: One end of the first resistor 117 is connected to the control end of the first voltage switch 118; The other end of the first resistor 117 is connected to the first end of the first voltage switch 118; A second terminal of the first voltage switch 118 is connected to the first output terminal 116 .

4. A functional safety circuit according to claim 1, characterized in that: The self-locking module 12 includes: a third input terminal 120, a second switch module 121, a third diode 122, a fourth diode 123, a second resistor 124, a second output terminal 125 and a fourth input terminal 126, wherein: The anode of the fourth diode 123 is connected to the second resistor 124; After the third input terminal 120 is connected to the anode of the third diode 122, it is connected to the fourth diode 123 and the second resistor 124; After the third input terminal 120, the third diode 122, the fourth diode 123 and the second resistor 124 are connected, they are connected to the second switch module 121; The second switch module 121 is connected to the second output terminal 125; An anode of the fourth diode 123 is connected to the fourth input terminal 126 .

5. A functional safety circuit according to claim 4, characterized in that: The second switch module 121 includes: a first transistor 1211, a second transistor 1212, a first power supply 1213, a third resistor 1214, a fourth resistor 1215 and a fifth resistor 1216, wherein: The control end of the first transistor 1211 is connected to the cathode of the third diode 122 and the cathode of the fourth diode 123; A first terminal of the first transistor 1211 is grounded, and a second terminal of the first transistor 1211 is connected to a third resistor 1214; The third resistor 1214 is connected to the control terminal of the second transistor 1212; The third resistor 1214 is connected to the fourth resistor 1215; A first end of the second transistor 1212 is connected to the first power source 1213 and the fourth resistor 1215 , and a second end of the second transistor 1212 is connected to the second resistor 124 .

6. A functional safety circuit according to claim 1, characterized in that: The self-locking control module 13 includes: a fifth input terminal 131, a fifth diode 132, an RC module 133, a second voltage switch 134 and a third output terminal 135, wherein: The fifth input terminal 131 is connected to the anode of the fifth diode 132; The cathode of the fifth diode 132 is connected to the RC module 133; The control end of the second voltage switch 134 is connected to the RC module 133 , the first end of the second voltage switch 134 is grounded, and the second end of the second voltage switch 134 is connected to the third output end 135 .

7. A functional safety circuit according to claim 6, characterized in that: The RC module 133 includes: a sixth resistor 1331 and a capacitor 1332, wherein: The sixth resistor 1331 is connected to the capacitor 1332 .

8. A functional safety circuit according to claim 5, characterized in that: Also includes: The first transistor 1211 is an NPN type triode; The second transistor 1212 is a PNP transistor.

9. A functional safety circuit according to claim 1, characterized in that: The functional module 15 includes: a sixth diode 151, a seventh diode 152, a seventh resistor 153, a load 154, a third voltage switch 155, a second power supply 156 and a sixth input terminal 157, wherein: The sixth input terminal 157 is connected to the anode of the sixth diode 151; After the cathode of the sixth diode 151 is connected to the cathode of the seventh diode 152, it is connected to the control end of the third voltage switch 155; One end of the seventh resistor 153 is connected to the control end of the third voltage switch 155; The other end of the seventh resistor 153 is connected to the load 154 and the first end of the third voltage switch 155; A second end of the third voltage switch 155 is connected to the second power source 156 .

10. An electronic system, characterized in that: A functional safety circuit comprising any one of claims 1 to 9.

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