Safety control device and punching machine control device

Abstract

The invention discloses a safety control device and a punching machine control device. The safety control device comprises a controlled circuit, a fault detection circuit, a short-circuit protection circuit and a control circuit. The controlled circuit comprises a controlled device, a safety disconnection circuit connected with the controlled device in series, and a switching circuit and a sampling circuit which are sequentially connected with the controlled device in series; the fault detection circuit is connected with the switching circuit and judges whether the controlled circuit is damaged or not based on the detection voltage output by the switching circuit to obtain a detection signal; the short-circuit protection circuit is connected with the sampling circuit and judges whether the controlled circuit is short-circuited based on a sampling signal of the sampling circuit to obtain a judgment signal; the control circuit is connected with the fault detection circuit, the short circuit protection circuit and the controlled circuit, and controls the controlled circuit based on the detection signal and the judgment signal. And by arranging the fault detection circuit and the short-circuit protection circuit, the safety of the controlled device is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of safety control, and particularly relates to a safety control device and a punching machine control device. Background Art

[0002] Currently, short - circuit faults are likely to occur in the first controlled unit and the second controlled unit of the controlled device, and the controlled device cannot detect the short - circuit fault in time, resulting in circuit damage. Summary of the Invention

[0003] In view of this, the present application discloses a safety control device and a punching machine control device to solve the above - mentioned technical problems.

[0004] The first aspect of the present application discloses a safety control device, including:

[0005] A controlled circuit, including a controlled device and a safety disconnect circuit connected in series with the controlled device, a switch circuit and a sampling circuit connected in series with the controlled device in sequence;

[0006] A fault detection circuit, connected to the switch circuit, and determining whether the controlled circuit is damaged based on the detection voltage output by the switch circuit to obtain a detection signal;

[0007] A short - circuit protection circuit, connected to the sampling circuit, and determining whether the controlled circuit is short - circuited based on the sampling signal of the sampling circuit to obtain a judgment signal;

[0008] A control circuit, respectively connected to the fault detection circuit, the short - circuit protection circuit and the controlled circuit, and controlling the controlled circuit based on the detection signal and the judgment signal.

[0009] In some embodiments, the controlled device includes a first controlled unit and a second controlled unit, the switch circuit includes a first control switch and a second control switch, the sampling circuit includes a first sampling resistor and a second sampling resistor, the safety disconnect circuit includes a power switch, the power switch is connected to one end of the first controlled unit and one end of the second controlled unit, the other end of the first controlled unit, the first control switch and the first sampling resistor are connected in series, and the other end of the second controlled unit, the second control switch and the second sampling resistor are connected in series.

[0010] In some embodiments, the short - circuit protection circuit includes a first short - circuit protection circuit and a second short - circuit protection circuit, the first short - circuit protection circuit is connected between the first control switch and the first sampling resistor, and the second short - circuit protection circuit is connected between the second control switch and the second sampling resistor.

[0011] In some embodiments, the sampling signal includes a first sampling signal and a second sampling signal. The first short - circuit protection circuit receives the first sampling signal between the first control switch and the first sampling resistor, compares the first sampling signal with a first threshold value to obtain a first judgment signal; the second short - circuit protection circuit receives the second sampling signal between the second control switch and the second sampling resistor, compares the second sampling signal with a second threshold value to obtain a second judgment signal, and the first threshold value and the second threshold value are equal or not equal.

[0012] In some embodiments, the control circuit transmits the first judgment signal to the control terminal of the first control switch, and transmits the second judgment signal to the control terminal of the second control switch to control the switching circuit.

[0013] In some embodiments, the control circuit generates a first control signal and a second control signal based on the first judgment signal and the second judgment signal, controls the first control switch through the first control signal, and controls the second control switch through the second control signal to control the switching circuit.

[0014] In some embodiments, when the control circuit determines that the first judgment signal or the second judgment signal is at a high level, the control circuit stops outputting the first control signal and the second control signal, and controls the power switch to disconnect.

[0015] In some embodiments, the fault detection circuit includes an AND - gate circuit, a first fault detection circuit, and a second fault detection circuit. The first input terminal of the AND - gate circuit is connected between the first controlled unit and the first control switch through the first fault detection circuit, the second input terminal of the AND - gate circuit is connected between the second controlled unit and the second control switch through the second fault detection circuit, and the output terminal of the AND - gate circuit is connected to the control circuit.

[0016] In some embodiments, the detection voltage includes a first detection voltage and a second detection voltage. The fault detection circuit receives the first detection voltage between the first control switch and the first controlled unit, receives the second detection voltage between the second control switch and the second controlled unit, and performs an AND - gate logic operation on the first detection voltage and the second detection voltage to obtain the detection signal.

[0017] In some embodiments, the control circuit outputs the first control signal and the second control signal. When it determines that the first determination signal and the second determination signal are at a low level, and determines that the detection signal is at a low level, the control circuit determines that the first control switch and the second control switch are damaged, stops outputting the first control signal and the second control signal, and controls the power switch to disconnect.

[0018] In some embodiments, the control circuit includes a control chip, a first semiconductor device, and a second semiconductor device. The first semiconductor device is connected to the control chip and the first control switch, and the second semiconductor device is connected to the control chip and the second control switch.

[0019] In some embodiments, the first short - circuit protection circuit includes a first comparator, a first low - pass filter, a first resistor, and a second resistor. The first input terminal of the comparator is connected between the first control switch and the first sampling resistor. The second input terminal of the comparator receives a reference voltage through the first resistor and is grounded through the second resistor. The output terminal of the comparator is connected to the control circuit through the low - pass filter. The second short - circuit protection circuit is the same as the first short - circuit protection circuit.

[0020] In some embodiments, the first fault detection circuit includes a first opto - coupler, a third resistor, and a fourth resistor. The first port of the first opto - coupler receives a power supply voltage through the third resistor. The second port of the first opto - coupler is connected between the first controlled unit and the first control switch. The third port of the first opto - coupler is connected to the first input terminal of the AND gate circuit. One end of the fourth resistor receives a reference voltage, and the other end of the fourth resistor is connected to the third port of the first opto - coupler. The fourth port of the first opto - coupler is grounded;

[0021] The second fault detection circuit includes a second opto - coupler, a fifth resistor, and a sixth resistor. The first port of the second opto - coupler receives a power supply voltage through the fifth resistor. The second port of the second opto - coupler is connected between the first controlled unit and the first control switch. The third port of the second opto - coupler is connected to the first input terminal of the AND gate circuit. One end of the sixth resistor receives a reference voltage, and the other end of the sixth resistor is connected to the third port of the opto - coupler. The fourth port of the second opto - coupler is grounded.

[0022] In some embodiments, the safety disconnection circuit further includes a safety relay and a third control switch. The third control switch receives a power supply voltage through the safety relay.

[0023] The second aspect of the present application discloses a punch control device, including the safety control device described above.

[0024] The beneficial effects of the present application are as follows: The fault detection circuit is connected to the switch circuit, and a detection signal is obtained based on the detection voltage output by the switch circuit. The short-circuit protection circuit is connected to the sampling circuit, and a judgment signal is obtained based on the sampling signal of the sampling circuit. The control circuit controls the controlled circuit based on the judgment signal to achieve the short-circuit protection function of the safety control device; the control circuit controls the controlled circuit based on the detection signal and the judgment signal to achieve the fault self-check function of the safety control device. By setting the fault detection circuit and the short-circuit protection circuit, the safety of the controlled device is enhanced.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a circuit schematic diagram of the first embodiment of the safety control device of the present application;

[0028] Figure 2 It is a circuit schematic diagram of the first embodiment of the controlled circuit of the present application;

[0029] Figure 3 It is a circuit schematic diagram of the first embodiment of the short-circuit protection circuit of the present application;

[0030] Figure 4 It is a circuit schematic diagram of the second embodiment of the safety control device of the present application;

[0031] Figure 5 It is a circuit schematic diagram of the first embodiment of the fault detection circuit of the present application;

[0032] Figure 6 It is a circuit schematic diagram of the first embodiment of the control circuit of the present application;

[0033] Figure 7 It is a circuit schematic diagram of the third embodiment of the safety control device of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be specifically noted that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only partial embodiments of the present application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0035] Reference to "embodiment" in this text means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "set", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to specific circumstances.

[0037] In the description of the present application, descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0038] The term "and / or" in this text is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after. In addition, "plurality" in this text means two or more. In addition, the term "at least one" in this text represents any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set composed of A, B, and C.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] Currently, short - circuit faults are likely to occur in the first controlled unit and the second controlled unit of the controlled device, and the controlled device cannot detect the short - circuit fault in time, resulting in circuit damage.

[0041] To solve the above problems, the present application proposes a safety control device and a punch control device. To enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0042] Please refer to Figure 1 , Figure 1 which is a circuit schematic diagram of the first embodiment of the safety control device of the present application. Among them, the safety control device includes a controlled circuit 10, a fault detection circuit 30, a short - circuit protection circuit 20, and a control circuit 40.

[0043] Among them, the controlled circuit 10 includes a controlled device 12 and a safety disconnection circuit 11 connected in series with the controlled device 12, a switch circuit 13 and a sampling circuit 14 connected in series with the controlled device 12 in sequence.

[0044] The short - circuit protection circuit 20 is connected to the sampling circuit 14, and determines whether the controlled circuit 10 is short - circuited based on the sampling signal of the sampling circuit 14 to obtain a judgment signal. The short - circuit protection circuit 20 is used to determine whether the controlled device 12 is short - circuited.

[0045] The fault detection circuit 30 is connected to the switch circuit 13, and determines whether the controlled circuit 10 is damaged based on the detection voltage output by the switch circuit 13 to obtain a detection signal. The fault detection circuit 30 and the short - circuit protection circuit 20 jointly determine whether the switch circuit 13 is damaged.

[0046] The control circuit 40 is respectively connected to the fault detection circuit 30, the short - circuit protection circuit 20, and the controlled circuit 10, and controls the controlled circuit 10 based on the detection signal and the judgment signal. The control circuit 40 is used to control the conduction and cut - off of the switch circuit 13 and the safety disconnection circuit 11.

[0047] In this embodiment, the fault detection circuit 30 is connected to the switch circuit 13, and a detection signal is obtained based on the detection voltage output by the switch circuit 13. The short-circuit protection circuit 20 is connected to the sampling circuit 14, and a judgment signal is obtained based on the sampling signal of the sampling circuit 14. The control circuit 40 controls the controlled circuit 10 based on the judgment signal to implement the short-circuit protection function of the safety control device; the control circuit 40 controls the controlled circuit 10 based on the detection signal and the judgment signal to implement the fault self-check function of the safety control device. By setting the fault detection circuit 30 and the short-circuit protection circuit 20, the safety of the controlled device 12 is enhanced.

[0048] Please refer to Figure 2 , Figure 2 which is a schematic circuit diagram of the first embodiment of the controlled circuit of the present application. Among them, the controlled circuit 10 includes a controlled device 12 and a safety disconnect circuit 11 connected in series with the controlled device 12, a switch circuit 13 and a sampling circuit 14 connected in series with the controlled device 12 in sequence.

[0049] Among them, the controlled device 12 includes a first controlled unit 121 and a second controlled unit 122. The first controlled unit 121 and the second controlled unit 122 are two linked valve bodies. When the switch circuit 13 is turned on, the first controlled unit 121 and the second controlled unit 122 are attracted; when the switch circuit 13 is turned off, the first controlled unit 121 and the second controlled unit 122 are disconnected. The first controlled unit 121 and the second controlled unit 122 can play the role of switching and regulating the flow rate in the fluid system. Among them, the fluid refers to a substance that can flow, such as gas or liquid. The fluid system can be a gas system or a liquid system. By operating the first controlled unit 121 and the second controlled unit 122, the opening or closing of the fluid can be realized. Among them, the first controlled unit 121 and the second controlled unit 122 can be applied to various industrial fields. For example, the first controlled unit 121 and the second controlled unit 122 can be applied to the fields of punch press control, petrochemical industry, medicine, food processing, papermaking and other industries. It should be noted that the application fields of the first controlled unit 121 and the second controlled unit 122 are not limited in this application.

[0050] Among them, the switch circuit 13 includes a first control switch Q1 and a second control switch Q2. Among them, the first control switch Q1 and the second control switch Q2 can be MOSFET transistors (Metal-Oxide-Semiconductor Field-Effect Transistor), etc., and this application does not limit this. Among them, MOSFET transistors are generally used as electronic switches and have the advantages of high input resistance, low noise, low power consumption, etc.

[0051] Among them, the sampling circuit 14 includes a first sampling resistor R1 and a second sampling resistor R2. The first sampling resistor R1 is connected to the first controlled unit 121, and the second sampling resistor R2 is connected to the second controlled unit 122. In some embodiments, the sampling resistor can play a role in overcurrent protection. For example, when a short circuit occurs in the first controlled unit 121 or the second controlled unit 122, the first sampling resistor R1 or the second sampling resistor R2 divides the voltage to prevent the switching circuit 13 from being burned out.

[0052] Among them, the safety disconnect circuit 11 includes a power switch K1. The power switch K1 is connected to one end of the first controlled unit 121 and one end of the second controlled unit 122. The other end of the first controlled unit 121, the first control switch Q1, and the first sampling resistor R1 are connected in series. The other end of the second controlled unit 122, the second control switch Q2, and the second sampling resistor R2 are connected in series.

[0053] Optionally, the safety disconnect circuit 11 may further include a safety relay H1 and a third control switch Q3. The third control switch Q3 receives the power supply voltage VCC through the safety relay H1. In some embodiments, the third control switch Q3 can be a triode. One end of the safety relay H1 is connected to the power supply, the other end of the safety relay H1 is connected to the collector of the third control switch Q3, and the emitter of the third control switch Q3 is grounded.

[0054] In some embodiments, the control circuit 40 is connected to the base of the third control switch Q3 to control the third control switch Q3 to conduct, and the safety relay H1 controls the power switch K1 to close, and the power supply starts to supply power. In some embodiments, please refer to Figure 7 and Figure 2 , Figure 7 is a circuit schematic diagram of the third embodiment of the safety control device of the present application. The control circuit 40 is connected to the base of the third control switch Q3 to control the third control switch Q3 to cut off, and the safety relay H1 controls the power switch K1 to disconnect, and the power supply stops supplying power.

[0055] In other embodiments, please refer to Figure 7 and Figure 2 ,the control circuit 40 is connected to the base of the third control switch Q3 to control the third control switch Q3 to conduct, and the safety relay H1 controls the power switch K1 to close, and the power supply starts to supply power.

[0056] Please refer to Figure 3 and Figure 7 , Figure 3It is a circuit schematic diagram of the first embodiment of the short - circuit protection circuit of the present application. The short - circuit protection circuit 20 includes a first short - circuit protection circuit 21 and a second short - circuit protection circuit 22. The first short - circuit protection circuit 21 is connected between the first control switch Q1 and the first sampling resistor R1, and the second short - circuit protection circuit 22 is connected between the second control switch Q2 and the second sampling resistor R2.

[0057] In some embodiments, the first short - circuit protection circuit 21 includes a first comparator J1, a first low - pass filter 211, a first resistor R3, and a second resistor R4.

[0058] Among them, the low - pass filter 211 may include a first filter resistor R5 and a first filter capacitor C1. One end of the first filter resistor R5 is connected to the output terminal of the first comparator J1, the other end of the first filter resistor R5 is grounded through the first filter capacitor C1, and the other end of the filter resistor R5 outputs a first judgment signal. The first low - pass filter 211 is used to improve the signal quality and reduce noise, avoiding unnecessary signal interference.

[0059] Optionally, the first comparator J1 may be an operational amplifier, and the operational amplifier includes a non - inverting input terminal and an inverting input terminal. When the voltage at the non - inverting input terminal is higher than the voltage at the inverting input terminal, the output level of the first comparator J1 is high; when the voltage at the non - inverting input terminal is lower than the voltage at the inverting input terminal, the output level of the first comparator J1 is low.

[0060] Among them, the first input terminal of the first comparator J1 is the non - inverting input terminal, which receives the sampling signal. The second input terminal of the first comparator J1 is the inverting input terminal, which receives the reference voltage V1. Specifically, please refer to Figure 7 , in the first short - circuit protection circuit 21, the first input terminal of the first comparator J1 is connected between the first control switch Q1 and the first sampling resistor R1, the second input terminal of the first comparator J1 receives the reference voltage V1 through the first resistor R3 and is grounded through the second resistor R4. The output terminal of the first comparator J1 is connected to the control circuit 40 through the low - pass filter 211.

[0061] In some embodiments, please refer to Figure 3 , the first short - circuit protection circuit 21 further includes a first pull - up resistor R9. The first pull - up resistor R9 is connected to the output terminal of the first comparator J1. When the voltage at the first input terminal of the first comparator J1 is higher than the voltage at the second input terminal of the first comparator J1, the output terminal of the first comparator J1 outputs a high level through the pull - up resistor.

[0062] Please refer to Figure 3 and Figure 7, the second short - circuit protection circuit 22 is the same as the first short - circuit protection circuit 21, and includes a second comparator J2, a second low - pass filter 221, a seventh resistor R6, an eighth resistor R7, and a second pull - up resistor R10. The second low - pass filter 211 includes a second filter resistor R8 and a second filter capacitor C2. The components in the second short - circuit protection circuit 22 and the connection relationships between the components correspond to those in the first short - circuit protection circuit 21, and are not described in detail herein.

[0063] In this embodiment, please refer to Figure 3 and Figure 7 , the voltage across the second resistor R4 can be the first threshold, and the voltage across the eighth resistor R7 can be the second threshold. The sampling signals received by the short - circuit protection circuit 20 include a first sampling signal and a second sampling signal. Among them, the first short - circuit protection circuit 21 receives the first sampling signal between the first control switch Q1 and the first sampling resistor R1, compares the first sampling signal with the first threshold, and obtains a first judgment signal; the second short - circuit protection circuit 22 receives the second sampling signal between the second control switch Q2 and the second sampling resistor R2, compares the second sampling signal with the second threshold, and obtains a second judgment signal. Among them, the first threshold and the second threshold are equal or not equal.

[0064] Please refer to Figure 4 , Figure 4 is a schematic circuit diagram of the second embodiment of the safety control device of the present application. The safety control device includes Figure 2 the controlled circuit 10 in Figure 3 the short - circuit protection circuit 20 and the control circuit 40 in

[0065] Among them, the first input terminal of the first comparator J1 in the first short - circuit protection circuit 21 is connected between the first control switch Q1 and the first sampling resistor R1 to receive the first sampling signal. The first input terminal of the first comparator J1 in the second short - circuit protection circuit 22 is connected between the second control switch Q2 and the second sampling resistor R2 to receive the second sampling signal. The control circuit 40 is connected to the first short - circuit protection circuit 21, receives the first judgment signal generated by the first short - circuit protection circuit 21, and transmits the first judgment signal to the control terminal of the first control switch Q1. The control circuit 40 is connected to the second short - circuit protection circuit 22, receives the second judgment signal generated by the second short - circuit protection circuit 22, and transmits the second judgment signal to the control terminal of the second control switch Q2. The control circuit 40 transmits the first judgment signal and the second judgment signal to the first control switch Q1 and the second control switch Q2 respectively, realizing the fast response of the switch circuit 13 and reducing the delay.

[0066] Please refer to Figure 5 and Figure 7 , Figure 5It is a schematic circuit diagram of the first embodiment of the fault detection circuit of the present application. The fault detection circuit 30 includes an AND gate circuit 33, a first fault detection circuit 31, and a second fault detection circuit 32. The first input terminal 331 of the AND gate circuit 33 is connected between the first controlled unit 121 and the first control switch Q1 through the first fault detection circuit 31. The second input terminal 332 of the AND gate circuit 33 is connected between the second controlled unit 122 and the second control switch Q2 through the second fault detection circuit 32. The output terminal 333 of the AND gate circuit 33 is connected to the control circuit 40.

[0067] Among them, the first fault detection circuit 31 includes a first optocoupler 310, a third resistor R13, and a fourth resistor R14. The first port 311 of the first optocoupler 310 receives the power supply voltage VCC through the third resistor R13. The second port 312 of the first optocoupler 310 is connected between the first controlled unit 121 and the first control switch Q1. The third port 313 of the first optocoupler 310 is connected to the first input terminal 331 of the AND gate circuit 33. One end of the fourth resistor R14 receives the reference voltage V1, and the other end of the fourth resistor R14 is connected to the third port 313 of the first optocoupler 310. The fourth port 314 of the first optocoupler 310 is grounded. It should be noted that the reference voltage V1 in the fault detection circuit 30 and the reference voltage V1 in the short-circuit protection circuit 20 may be the same or different.

[0068] Among them, the second fault detection circuit 32 includes a second optocoupler 320, a fifth resistor R11, and a sixth resistor R12. The first port 321 of the second optocoupler 320 receives the power supply voltage VCC through the fifth resistor R11. The second port 322 of the second optocoupler 320 is connected between the first controlled unit 121 and the first control switch Q1. The third port 323 of the second optocoupler 320 is connected to the first input terminal 331 of the AND gate circuit 33. One end of the sixth resistor R12 receives the reference voltage V1, and the other end of the sixth resistor R12 is connected to the third port 323 of the second optocoupler 320. The fourth port 324 of the second optocoupler 320 is grounded.

[0069] In this embodiment, the detection voltage includes a first detection voltage and a second detection voltage. The fault detection circuit 30 receives the first detection voltage between the first control switch Q1 and the first controlled unit 121, receives the second detection voltage between the second control switch Q2 and the second controlled unit 122, and performs an AND logic operation on the first detection voltage and the second detection voltage to obtain a detection signal.

[0070] Optionally, please refer to Figure 5, the fault detection circuit 30 further includes a third pull-up resistor, and the third pull-up resistor is connected to the output terminal 333 of the AND gate circuit 33, so that the output terminal 333 of the AND gate circuit 33 is in a stable level state when there is no input signal.

[0071] In an application scenario, if at least one of the first detection voltage and the second detection voltage is at a low level, the detection signal is at a low level; if both the first detection voltage and the second detection voltage are at a high level, the detection signal is at a high level.

[0072] Please refer to Figure 6 and Figure 7 , Figure 6 is a schematic circuit diagram of the first embodiment of the control circuit of the present application. The control circuit 40 includes a control chip 43, a first semiconductor device Q4, and a second semiconductor device Q5. The first semiconductor device Q4 is connected to the control chip 43 and the first control switch Q1, and the second semiconductor device Q5 is connected to the control chip 43 and the second control switch Q2. Specifically, the base of the first semiconductor device Q4 is connected to the first output terminal 434 of the control chip 43, the base of the second semiconductor device Q5 is connected to the second output terminal 435 of the control chip 43, the collector of the first semiconductor device Q4 is connected to the gate of the first control switch Q1, and the collector of the second semiconductor device Q5 is connected to the gate of the second control switch Q2. The collector of the first semiconductor device Q4 receives the power supply voltage VCC through the ninth resistor R16; the collector of the second semiconductor device Q5 receives the power supply voltage VCC through the tenth resistor R17.

[0073] Optionally, the first semiconductor device Q4 can be a triode, and the voltage across the collector and emitter of the first semiconductor device Q4 can be the first control signal. When the first semiconductor device Q4 is cut off, the first control signal is at a high level, that is, the control circuit 40 outputs the first control signal. When the first semiconductor device Q4 is turned on, the first control signal is at a low level, that is, the control circuit 40 stops outputting the first control signal.

[0074] Optionally, the second semiconductor device Q5 can be a triode, and the voltage across the collector and emitter of the second semiconductor device Q5 can be the second control signal. When the second semiconductor device Q5 is cut off, the second control signal is at a high level, that is, the control circuit 40 outputs the second control signal. When the second semiconductor device Q5 is turned on, the second control signal is at a low level, that is, the control circuit 40 stops outputting the second control signal.

[0075] Please refer to Figure 6 and Figure 7, the first output terminal 434 of the control chip 43 is connected to the first semiconductor device Q4 to output a first output signal. When the first output signal is at a low level, the first semiconductor device Q4 is turned off, the first control signal is at a high level, that is, the first control signal is output, and the first control switch Q1 is turned on. When the first output signal is at a high level, the first semiconductor device Q4 is turned on, the first control signal is at a low level, that is, the output of the first control signal stops, and the first control switch Q1 is turned off.

[0076] Please refer to Figure 6 and Figure 7 , the second output terminal 435 of the control circuit 40 is connected to the second semiconductor device Q5 to output a second output signal. When the second output signal is at a low level, the second semiconductor device Q5 is turned off, the second control signal is at a high level, that is, the second control signal is output, and the second control switch Q2 is turned on. When the second output signal is at a high level, the second semiconductor device Q5 is turned on, the second control signal is at a low level, that is, the output of the second control signal stops, and the second control switch Q2 is turned off.

[0077] Please refer to Figure 7 , Figure 7 is a schematic circuit diagram of the third embodiment of the safety control device of the present application. Figure 7 The safety control device in Figure 2 includes the controlled circuit 10 in Figure 3 the short - circuit protection circuit 20 in Figure 5 the fault detection circuit 30 in Figure 6 and the control circuit 40 in

[0078] Among them, the first input terminal of the first comparator J1 in the first short - circuit protection circuit 21 is connected between the first control switch Q1 and the first sampling resistor R1 to receive the first sampling signal. The first input terminal of the second comparator J2 in the second short - circuit protection circuit 22 is connected between the second control switch Q2 and the second sampling resistor R2 to receive the second sampling signal.

[0079] In the fault detection circuit 30, the second port 312 of the first opto - coupler 310 is connected between the first controlled unit 121 and the first control switch Q1 to receive the first detection voltage, and the second port 322 of the second opto - coupler 320 is connected between the first controlled unit 121 and the first control switch Q1 to receive the second detection voltage.

[0080] The first input terminal 431 of the control chip 43 is connected to the output terminal 333 of the AND gate circuit 33 to receive the detection signal. The second input terminal 432 of the control chip 43 is connected to the output terminal of the first comparator J1 through the low-pass filter 211 of the first short-circuit protection circuit 21 to receive the first judgment signal. The third input terminal 433 of the control chip 43 is connected to the output terminal of the second comparator J2 in the second short-circuit protection circuit 22 through the low-pass filter 221 of the second short-circuit protection circuit 22 to receive the second judgment signal. The collector of the first semiconductor device Q4 is connected to the gate of the first control switch Q1, and the collector of the second semiconductor device Q5 is connected to the gate of the second control switch Q2. The third output terminal 436 of the control chip 43 is connected to the base of the third control switch Q3 to control the third control switch Q3.

[0081] In some embodiments, please refer to Figure 7 , the control circuit 40 generates a first control signal and a second control signal based on the first judgment signal and the second judgment signal, controls the first control switch Q1 through the first control signal, and controls the second control switch Q2 through the second control signal to control the switch circuit 13.

[0082] Among them, the control circuit 40 outputs a first control signal to the control terminal of the first control switch Q1, and the first control switch Q1 is turned on. The control circuit 40 stops outputting the first control signal to the control terminal of the first control switch Q1, and the first control switch Q1 is turned off; the control circuit 40 outputs a second control signal to the control terminal of the second control switch Q2, and the second control switch Q2 is turned on. The control circuit 40 stops outputting the second control signal to the control terminal of the second control switch Q2, and the second control switch Q2 is turned off.

[0083] In an application scenario, please refer to Figure 7 , when the control circuit 40 determines that the first judgment signal or the second judgment signal is at a high level, indicating that the controlled device 12 has a short-circuit fault, the control circuit 40 stops outputting the first control signal and the second control signal, the first control switch Q1 is turned off, and the second control switch Q2 is turned off, avoiding damage to the switch due to the switch circuit 13 passing through the short-circuit current for a long time. Optionally, the third output terminal 436 of the control circuit 40 stops outputting the third control signal to the base of the third control switch Q3, the third control switch Q3 is turned off, and the power switch K1 is disconnected, and the power supply stops supplying power.

[0084] In an application scenario, please refer to Figure 7, the control circuit 40 outputs a first control signal and a second control signal. When it is determined that the first determination signal and the second determination signal are at a low level, and it is determined that the detection signal is at a low level, the control circuit 40 determines that the first control switch Q1 and the second control switch Q2 are damaged, and stops outputting the first control signal and the second control signal. The third output terminal 436 of the control circuit 40 stops outputting a third control signal to the base of the third control switch Q3, the third control switch Q3 is turned off, the power switch K1 is disconnected, and the power supply stops supplying power.

[0085] Based on the above safety control device, the present application also correspondingly provides a punching machine control device, including the safety control device as described above. Since the safety control device has been described in detail above, it will not be elaborated here.

[0086] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the present invention without departing from the spirit and scope of the present invention based on the content disclosed in the application documents.

Claims

1. A safety control device, characterized in that, Comprising: A controlled circuit, including a controlled device and a safety disconnect circuit connected in series with the controlled device, a switch circuit and a sampling circuit connected in series with the controlled device in sequence; A fault detection circuit, connected to the switch circuit, determining whether the controlled circuit is damaged based on a detection voltage output by the switch circuit to obtain a detection signal; A short-circuit protection circuit, connected to the sampling circuit, determining whether the controlled circuit is short-circuited based on a sampling signal of the sampling circuit to obtain a judgment signal; A control circuit, respectively connected to the fault detection circuit, the short-circuit protection circuit and the controlled circuit, controlling the controlled circuit based on the detection signal and the judgment signal.

2. The safety control device according to claim 1, wherein: The controlled device includes a first controlled unit and a second controlled unit, the switch circuit includes a first control switch and a second control switch, the sampling circuit includes a first sampling resistor and a second sampling resistor, the safety disconnect circuit includes a power switch, the power switch is connected to one end of the first controlled unit and one end of the second controlled unit, the other end of the first controlled unit, the first control switch and the first sampling resistor are connected in series, and the other end of the second controlled unit, the second control switch and the second sampling resistor are connected in series.

3. The safety control device according to claim 2, wherein: The short-circuit protection circuit includes a first short-circuit protection circuit and a second short-circuit protection circuit, the first short-circuit protection circuit is connected between the first control switch and the first sampling resistor, and the second short-circuit protection circuit is connected between the second control switch and the second sampling resistor.

4. The safety control device according to claim 1, wherein: The sampling signal includes a first sampling signal and a second sampling signal, the first short-circuit protection circuit receives the first sampling signal from between the first control switch and the first sampling resistor, compares the first sampling signal with a first threshold to obtain a first judgment signal; the second short-circuit protection circuit receives the second sampling signal from between the second control switch and the second sampling resistor, compares the second sampling signal with a second threshold to obtain a second judgment signal, and the first threshold and the second threshold are equal or unequal.

5. The safety control device according to claim 4, wherein: The control circuit transmits the first judgment signal to the control end of the first control switch and transmits the second judgment signal to the control end of the second control switch to control the switch circuit.

6. The safety control device according to claim 4, wherein: The control circuit generates a first control signal and a second control signal based on the first judgment signal and the second judgment signal, controls the first control switch through the first control signal, and controls the second control switch through the second control signal to control the switch circuit.

7. The safety control device according to claim 6, wherein When the control circuit determines that the first determination signal or the second determination signal is at a high level, the control circuit stops outputting the first control signal and the second control signal, and controls the power switch to disconnect.

8. The safety control device according to claim 2, wherein The fault detection circuit includes an AND gate circuit, a first fault detection circuit, and a second fault detection circuit. The first input terminal of the AND gate circuit is connected between the first controlled unit and the first control switch through the first fault detection circuit. The second input terminal of the AND gate circuit is connected between the second controlled unit and the second control switch through the second fault detection circuit. The output terminal of the AND gate circuit is connected to the control circuit.

9. The safety control device according to claim 2, wherein The detection voltage includes a first detection voltage and a second detection voltage. The fault detection circuit receives the first detection voltage between the first control switch and the first controlled unit, and receives the second detection voltage between the second control switch and the second controlled unit, and performs an AND gate logic operation on the first detection voltage and the second detection voltage to obtain the detection signal.

10. The safety control device according to claim 6, wherein When the control circuit outputs the first control signal and the second control signal, determines that the first determination signal and the second determination signal are at a low level, and determines that the detection signal is at a low level, the control circuit determines that the first control switch and the second control switch are damaged, stops outputting the first control signal and the second control signal, and controls the power switch to disconnect.

11. The safety control device according to claim 2, characterized in that, The control circuit includes a control chip, a first semiconductor device, and a second semiconductor device. The first semiconductor device is connected between the control chip and the first control switch, and the second semiconductor device is connected between the control chip and the second control switch.

12. The safety control device according to claim 3, wherein The first short-circuit protection circuit includes a first comparator, a first low-pass filter, a first resistor, and a second resistor. The first input terminal of the comparator is connected between the first control switch and the first sampling resistor. The second input terminal of the comparator receives a reference voltage through the first resistor and is grounded through the second resistor. The output terminal of the comparator is connected to the control circuit through the low-pass filter. The second short-circuit protection circuit is the same as the first short-circuit protection circuit.

13. The safety control device according to claim 8, wherein The first fault detection circuit includes a first optocoupler, a third resistor, and a fourth resistor. The first port of the first optocoupler receives the power supply voltage through the third resistor. The second port of the first optocoupler is connected between the first controlled unit and the first control switch. The third port of the first optocoupler is connected to the first input terminal of the AND gate circuit. One end of the fourth resistor receives the reference voltage, and the other end of the fourth resistor is connected to the third port of the first optocoupler. The fourth port of the first optocoupler is grounded; The second fault detection circuit includes a second optocoupler, a fifth resistor, and a sixth resistor. The first port of the second optocoupler receives the power supply voltage through the fifth resistor. The second port of the second optocoupler is connected between the first controlled unit and the first control switch. The third port of the second optocoupler is connected to the first input terminal of the AND gate circuit. One end of the sixth resistor receives the reference voltage, and the other end of the sixth resistor is connected to the third port of the optocoupler. The fourth port of the second optocoupler is grounded.

14. The safety control device according to claim 1, wherein The safety disconnect circuit further includes a safety relay and a third control switch. The third control switch receives the power supply voltage through the safety relay.

15. A punching machine control device, characterized in that, Comprising the safety control device according to any one of claims 1-14.

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