A drive control circuit

Abstract

The present invention provides a drive control circuit, which realizes dual-controller control by respectively outputting control signals to the drive modules through two control modules, thereby improving the reliability of the circuit. The selection signals output by the control modules are detected by a backcheck module. When the control modules detect that any selection signal is wrong, the first control module and the second control module stop outputting the control signal, thereby improving the safety of the drive control circuit.

Description

Technical Field

[0001] The present invention relates to the field of drive control, and in particular to a drive control circuit. Background Art

[0002] Railways are an important part of my country's transportation. With the vigorous development of rail transportation, the speed of vehicles is getting faster and faster, and the density of vehicles is getting higher and higher. Correspondingly, the safety requirements for railway signal equipment are also getting higher and higher, which means that the relevant requirements for the safe output of railway drive equipment are also getting higher and higher.

[0003] In actual applications, different devices have different security strategies, and for control systems that include software and hardware, their safety functions are often implemented by both software and hardware. Currently, for areas with functional safety requirements such as rail transportation and nuclear power, the probability of dangerous failure of the safety function of railway signal equipment involved in train control is ≥10 per hour. -9 Therefore, the safety requirements for this type of equipment are extremely high. Summary of the Invention

[0004] In view of this, the present invention provides a drive control circuit, which improves the safety and reliability of the drive control circuit by adopting dual control modules for control and backchecking.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a driving control circuit, comprising: a first control module, a second control module, a driving module, a gating module and a checkback module; wherein,

[0007] The first control module outputs at least one control signal and at least one strobe signal, and the second control module outputs at least one control signal and at least one strobe signal;

[0008] At least one control signal output by the first control module and at least one control signal output by the second control module are output to the driving module as driving control signals. After receiving the driving control signals, the driving module outputs a corresponding driving signal.

[0009] At least one strobe signal output by the first control module and at least one strobe signal output by the second control module are output as strobe control signals to the strobe module. After receiving the strobe control signals, the strobe module turns on the corresponding strobe channel.

[0010] The back-check module collects the back-check signal of the strobe module and outputs the corresponding strobe back-check signal to the first control module and the second control module;

[0011] The first control module and the second control module determine whether the strobe control signal is wrong according to the strobe check signal;

[0012] If the strobe control signal is erroneous, the first control module and the second control module stop outputting control signals.

[0013] Optionally, after the first control module and the second control module determine whether the strobe control signal is erroneous according to the check signal, the method further includes:

[0014] If the strobe control signal is not erroneous, the first control module and the second control module continue to output control signals.

[0015] Optionally, the control signal output by the first control module includes two opposite control signals;

[0016] The control signal output by the second control module includes two opposite control signals.

[0017] Optionally, the driving module includes: a plurality of driving channels;

[0018] The at least one control signal output by the first control module and the second control module is output through the same number of driving channels.

[0019] Optionally, the driving channel includes: a driving unit and at least one optical coupling isolation unit;

[0020] The input end of the driving unit is connected to the input end of the driving channel;

[0021] The output end of the driving unit is connected to the input end of the optical coupling isolation unit;

[0022] The output end of the optical coupling isolation unit is connected to the output end of the driving channel.

[0023] Optionally, the optocoupler isolation unit includes: an optocoupler isolation primary side and at least one optocoupler isolation secondary side.

[0024] Optionally, the driving channel further includes: a current limiting processing unit;

[0025] The current limiting processing unit is arranged between the driving unit and the optical coupling isolation unit.

[0026] Optionally, the drive control circuit further includes: a power supply module;

[0027] The power supply module supplies power to the optocoupler isolation secondary side of the optocoupler isolation unit;

[0028] The input end of the power module is connected to an external power supply and / or a system power supply.

[0029] Optionally, the input end of the gating module is connected to the primary side ground end of the optocoupler isolation unit;

[0030] The output end of the gating module is grounded.

[0031] Optionally, the gating module includes: a two-choose-one channel unit, and a first switch unit and a second switch unit connected in parallel;

[0032] The input end of the two-select-one channel unit serves as the input end of the gating module and is connected to the primary side ground end of the optical coupling isolation unit;

[0033] The output end of the two-select-one channel unit is connected to the input end of the first switch unit and the input end of the second switch unit;

[0034] The output end of the first switch unit and the output end of the second switch unit are grounded;

[0035] The one-of-two channel selection unit is used to generate the check signal.

[0036] Optionally, the first switch unit includes: a first isolating switch and a second isolating switch;

[0037] The first isolating switch and the second isolating switch are connected in series to form the first switch unit;

[0038] The first isolation switch is communicatively connected to the first control module;

[0039] The second isolation switch is communicatively connected to the second control module.

[0040] Optionally, the second switch unit includes: a third isolating switch and a fourth isolating switch;

[0041] The third isolating switch and the fourth isolating switch are connected in series to form the second switch unit;

[0042] The third isolation switch is communicatively connected to the first control module;

[0043] The fourth isolation switch is communicatively connected to the second control module.

[0044] Optionally, the recheck module includes: a first photoelectric isolation unit, a second photoelectric isolation unit, a third photoelectric isolation unit and a fourth photoelectric isolation unit;

[0045] The input end of the first photoelectric isolation unit and the input end of the third photoelectric isolation unit both receive a first check signal indicating whether the first switch unit in the gating module is turned on;

[0046] The input end of the second photoelectric isolation unit and the input end of the fourth photoelectric isolation unit both receive a second check signal indicating whether the second switch unit in the gating module is turned on;

[0047] The output end of the first photoelectric isolation unit and the output end of the second photoelectric isolation unit are connected to the input end of the first control module;

[0048] The output end of the third photoelectric isolation unit and the output end of the fourth photoelectric isolation unit are connected to the input end of the second control module.

[0049] The drive control circuit provided by the present invention includes two control modules, which respectively output control signals to the drive module to realize dual-controller control, thereby improving the reliability of the circuit; and the selection signal output by the control module is detected by the return detection module. When the control module detects that any selection signal is wrong, the first control module and the second control module stop outputting the control signal, thereby improving the safety of the drive control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings to be used in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0051] Figure 1 A schematic structural diagram of a safety output circuit provided in an embodiment of the present invention;

[0052] Figure 2 A schematic diagram of the specific structure of the driving module provided in an embodiment of the present invention;

[0053] Figure 3 Another specific structural diagram of the driving module provided by an embodiment of the present invention;

[0054] Figure 4 Another structural diagram of a safety output circuit provided by an embodiment of the present invention;

[0055] Figure 5 A schematic diagram of the specific structure of the gating module provided in an embodiment of the present invention;

[0056] Figure 6This is a schematic diagram of the specific structure of the backcheck module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0059] The present invention provides a drive control circuit which improves the safety and reliability of the drive control circuit by adopting dual control modules for control and backchecking.

[0060] like Figure 1 As shown, the drive control circuit includes: a first control module 100, a second control module 200, a drive module 300, a gating module 400 and a checkback module 500; wherein,

[0061] The first control module 100 is respectively connected to the driving module 300, the gating module 400 and the return detection module 500; the second control module 200 is respectively connected to the driving module 300, the gating module 400 and the return detection module 500; the output end of the driving module 300 serves as the output end of the driving control circuit; the gating module 400 is arranged between the driving module 300 and the ground, and the input end of the return detection module 500 receives the gating signal of the gating module 400.

[0062] The specific working principle is:

[0063] The first control module 100 outputs at least one control signal and at least one strobe signal, and the second control module 200 outputs at least one control signal and at least one strobe signal; the at least one control signal output by the first control module 100 and the at least one control signal output by the second control module 200 are output as driving control signals to the driving module 300, and the driving module 300 outputs a corresponding driving signal after receiving the driving control signal; the at least one strobe signal output by the first control module 100 and the at least one strobe signal output by the second control module 200 are output as strobe control signals to the strobe module 400, and the strobe module 400 After receiving the selection control signal, the corresponding selection channel is opened so that the driving module 300 can output the corresponding driving signal; the return check module 500 collects the return check signal of the selection module 400 and outputs the corresponding selection return check signal to the first control module 100 and the second control module 200; the first control module 100 and the second control module 200 judge whether the selection control signal is wrong based on the selection return check signal; if the selection control signal is wrong, the first control module 100 and the second control module 200 stop outputting the control signal; if the selection control signal is not wrong, the first control module 100 and the second control module 200 continue to output the control signal.

[0064] The drive control circuit provided in this embodiment includes two control modules, which respectively output control signals to the drive module 300 to achieve dual-controller control, thereby improving the reliability of the circuit. The check module 500 detects the selection signal output by the control module. When the control module detects that any selection signal is wrong, the first control module 100 and the second control module 200 stop outputting the control signal, thereby improving the safety of the drive control circuit. This conforms to the concept of a 2-out-of-2 architecture, has strong logic, practicality, and scalability, meets SIL4 safety requirements, and is low-cost.

[0065] On the basis of the previous embodiment, in order to realize the independent output of multiple control signals, the driving module 300 of the driving control circuit may include: multiple driving channels; Figure 2 In the example, four drive channels S1, S2, S3, and S4 are used. The control signal output by the first control module 100 includes two opposing control signals, which can be outputted via its IO1 and IO2 pins and transmitted to the inputs of drive channels S1 and S3, respectively. The control signal output by the second control module 200 includes two opposing control signals, which can also be outputted via its IO1 and IO2 pins and transmitted to the inputs of drive channels S2 and S4, respectively. In this case, drive channels S1 and S3 can be powered by the same power supply (e.g., power supply 1), and drive channels S2 and S4 can be powered by the same power supply (e.g., power supply 2).

[0066] In actual applications, at least one control signal output by the first control module 100 and the second control module 200 is output through the same number of drive channels. For example, each control signal is received in parallel by n (n is an integer greater than 1) drive channels. At this time, the drive control circuit can realize the independent output of n drive signals.

[0067] Specifically, such as Figure 2 As shown, each driving channel may specifically include: a driving unit and an optical coupling isolation unit; wherein,

[0068] The input end of the driving unit is connected to the input end of the driving channel; the output end of the driving unit is connected to the input end of the optocoupler isolation unit; the output end of the optocoupler isolation unit is connected to the output end of the driving channel; in actual applications, each optocoupler isolation unit includes an optocoupler isolation primary side and at least one optocoupler isolation secondary side.

[0069] It is worth mentioning that Figure 2 In the example, only one driving signal (including four signals) output by the driving control circuit is shown. When the driving signal output by the driving control circuit needs to be received by n different objects, and each driving signal includes m (m is an integer greater than 1, Figure 2 (In this example, m=4 is used for demonstration) When there are two types of signals:

[0070] (1) A total of n×m driving channels can be set, and each driving signal is output by m driving channels receiving different control signals. For each control signal, n driving channels are set to receive in parallel.

[0071] (2) A total of m driving channels may be provided, each of which receives a different control signal. However, each driving channel is provided with n optocoupler isolation units with input terminals connected in parallel.

[0072] (3) Alternatively, when a total of m driving channels are provided and each driving channel receives a different control signal, n optocoupler isolation secondary sides may be provided for the only optocoupler isolation unit in each driving channel.

[0073] The specific method may depend on the application environment and is not limited here, and all methods fall within the scope of protection of this application.

[0074] To avoid common cause failures of output signals, the drive control circuit provided in this embodiment implements independent transmission of multiple drive signals by adopting multiple drive channels, multiple optocoupler isolation units, or multiple optocoupler isolation secondary sides. Moreover, by providing optocoupler isolation units in the drive channels, the isolation between the input and output ports is improved, thereby protecting the input and output ports of each drive channel.

[0075] On the basis of the above embodiment, the control signals output by the first control module 100 and the second control module 200 are greatly enhanced after passing through the driving units in each driving channel. In order to prevent the driving signal from being too large and damaging other components of the device, the driving module 300 of the driving control circuit can be as follows Figure 3 (In Figure 2 As shown in the example above, a current limiting processing unit is added between the driving unit and the optocoupler isolation unit to reduce the loop current and protect other devices.

[0076] In this embodiment, the current limiting processing unit is adopted to reduce the loop current of each driving channel, thereby further improving the safety of the device.

[0077] On the basis of the above embodiment, the drive control circuit, such as Figure 4 As shown (in Figure 1 The power supply module 600 is used as an example to show the power supply of the optocoupler isolation secondary side of the optocoupler isolation unit. The input end of the power supply module 600 can be connected to an external power supply, or to a system power supply, or to an external power supply and a system power supply respectively (such as Figure 4 ).

[0078] The drive control circuit provided in this embodiment utilizes a power module 600 to power the optocoupler isolation secondary side of the optocoupler isolation unit, thereby ensuring independent power supply for each optocoupler isolation secondary side. Furthermore, when the input terminals of the power module 600 are connected to an external power source and a system power source, either power source can be selected as the power source. Furthermore, if either the external power source or the system power source fails or is insufficient, the power module can select the other power source to ensure normal power supply to the optocoupler isolation secondary side.

[0079] On the basis of the above embodiment, in the driving control circuit, the input end of the gating module 400 is connected to the primary side ground end of the optical coupling isolation unit, and the output end of the gating module 400 is grounded; see Figure 5 The gating module 400 specifically includes: a two-select-one channel unit 405, a first isolating switch 401, a second isolating switch 402, a third isolating switch 403 and a fourth isolating switch 404; wherein,

[0080] The first isolating switch 401 and the second isolating switch 402 are connected in series to form a first switch unit; the control end of the first isolating switch 401 is connected to the IO3 pin of the first control module 100 to achieve a communication connection between the two; the control end of the second isolating switch 402 is connected to the IO3 pin of the second control module 200 to achieve a communication connection between the two; the third isolating switch 403 and the fourth isolating switch 404 are connected in series to form a second switch unit; the control end of the third isolating switch 403 is connected to the IO4 pin of the first control module 100 to achieve a communication connection between the two; the control end of the fourth isolating switch 404 is connected to the IO4 pin of the second control module 200 to achieve a communication connection between the two; the first switch unit and the second switch unit are connected in parallel; the connection point where the input end of the first switch unit and the input end of the second switch unit are connected in parallel is connected to the output end of the two-selection channel unit 405, and the input end of the two-selection channel unit 405 serves as the input end of the selection module 400.

[0081] It is worth noting that the hardware configurations of each isolating switch are the same, so that the first control module 100 and the second control module 200 can realize the control of each isolating switch; the first isolating switch 401 and the second isolating switch 402 work together to cooperate with each other to provide one signal gating channel; the third isolating switch 403 and the fourth isolating switch 404 work together to cooperate with each other to provide another signal gating channel; each signal gating channel is jointly controlled by the first control module 100 and the second control module 200, and the corresponding signal gating channel will only be opened when the first control module 100 and the second control module 200 simultaneously output the opening control signal; the two gating channels must be opened in sequence for the gating module 400 to work normally; if the isolating switches are not opened in sequence, no signal will be output in the end.

[0082] The drive control circuit provided in this embodiment uses the first control module 100 and the second control module 200 to jointly control the opening and closing of each isolation switch in the selection module 400, and cooperates with the drive module 300 to achieve the output of the final drive signal, thereby improving the safety and reliability of the drive control circuit.

[0083] On the basis of the above embodiment, the checkback module 500 of the drive control circuit is as follows: Figure 6 As shown, it includes: a first photoelectric isolation unit 501, a second photoelectric isolation unit 502, a third photoelectric isolation unit 503 and a fourth photoelectric isolation unit 504; wherein,

[0084] The input end of the first photoelectric isolation unit 501 and the input end of the third photoelectric isolation unit 503 are both connected to a signal end of the two-selection channel unit 405 in the gating module 400, and receive a first feedback signal indicating whether the first switch unit in the gating module 400 is conductive. The input end of the second photoelectric isolation unit 502 and the input end of the fourth photoelectric isolation unit 504 are both connected to the other signal end of the two-selection channel unit 405, and receive a second feedback signal indicating whether the second switch unit in the gating module 400 is conductive. The output end of the first photoelectric isolation unit 501 and the output end of the second photoelectric isolation unit 502 are connected to corresponding input ends of the first control module 100, and provide the first control module 100 with gating feedback signals 1 and 3. The output end of the third photoelectric isolation unit 503 and the output end of the fourth photoelectric isolation unit 504 are connected to corresponding input ends of the second control module 200, and provide the second control module 200 with gating feedback signals 2 and 4.

[0085] In actual applications, when the isolation switches in the selection module 400 are opened in sequence, the selection return check signals output by the photoelectric isolation units in the return check module 500 are all high-level, which means that the selection control signal is not wrong. At this time, the first control module 100 and the second control module 200 continue to output the control signal; when the isolation switches in the selection module 400 are not opened in sequence, any of the selection return check signals output by the photoelectric isolation units in the return check module 500 is not high-level, which means that the selection control signal is wrong. At this time, the first control module 100 and the second control module 200 stop outputting the control signal.

[0086] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Ordinary technicians in this field can understand and implement it without making any creative efforts.

[0087] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0088] With respect to the above description of the disclosed embodiments, the features described in the various embodiments in this specification may be interchanged or combined to enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drive control circuit, characterized in that: include: A first control module, a second control module, a driving module, a gating module and a back-checking module; wherein, The first control module outputs at least one control signal and at least one strobe signal, and the second control module outputs at least one control signal and at least one strobe signal; At least one control signal output by the first control module and at least one control signal output by the second control module are output to the driving module as driving control signals. After receiving the driving control signals, the driving module outputs a corresponding driving signal. At least one strobe signal output by the first control module and at least one strobe signal output by the second control module are output as strobe control signals to the strobe module. After receiving the strobe control signals, the strobe module opens the corresponding strobe channel. Each signal strobe channel is controlled by the first control module and the second control module. The corresponding signal strobe channel is opened only when the first control module and the second control module simultaneously output the opening control signals. The back-check module collects the back-check signal of the strobe module and outputs the corresponding strobe back-check signal to the first control module and the second control module; The first control module and the second control module determine whether the strobe control signal is wrong according to the strobe check signal; If the strobe control signal is erroneous, the first control module and the second control module stop outputting control signals.

2. The drive control circuit according to claim 1, wherein: After the first control module and the second control module determine whether the strobe control signal is erroneous according to the check signal, the method includes: If the strobe control signal is not erroneous, the first control module and the second control module continue to output control signals.

3. The drive control circuit according to claim 1, wherein: The control signal output by the first control module includes two opposite control signals; The control signal output by the second control module includes two opposite control signals.

4. The drive control circuit according to claim 1, wherein: The driving module includes: a plurality of driving channels; The at least one control signal output by the first control module and the second control module is output through the same number of driving channels.

5. The drive control circuit according to claim 4, characterized in that: The driving channel includes: a driving unit and at least one optical coupling isolation unit; The input end of the driving unit is connected to the input end of the driving channel; The output end of the driving unit is connected to the input end of the optical coupling isolation unit; The output end of the optical coupling isolation unit is connected to the output end of the driving channel.

6. The drive control circuit according to claim 5, characterized in that: The optical coupling isolation unit includes: an optical coupling isolation primary side and at least one optical coupling isolation secondary side.

7. The drive control circuit according to claim 5, characterized in that: The driving channel further includes: a current limiting processing unit; The current limiting processing unit is arranged between the driving unit and the optical coupling isolation unit.

8. The drive control circuit according to claim 5, characterized in that: The drive control circuit further includes: a power supply module; The power supply module supplies power to the optocoupler isolation secondary side of the optocoupler isolation unit; The input end of the power module is connected to an external power supply and / or a system power supply.

9. The drive control circuit according to claim 5, characterized in that: The input end of the gating module is connected to the primary side ground end of the optical coupling isolation unit; The output end of the gating module is grounded.

10. The drive control circuit according to any one of claims 5 to 9, characterized in that: The gating module includes: a two-choose-one channel unit, and a first switch unit and a second switch unit connected in parallel; The input end of the two-select-one channel unit serves as the input end of the gating module and is connected to the primary side ground end of the optical coupling isolation unit; The output end of the two-select-one channel unit is connected to the input end of the first switch unit and the input end of the second switch unit; The output end of the first switch unit and the output end of the second switch unit are grounded; The one-of-two channel selection unit is used to generate the check signal.

11. The drive control circuit according to claim 10, wherein: The first switch unit includes: a first isolating switch and a second isolating switch; The first isolating switch and the second isolating switch are connected in series to form the first switch unit; The first isolation switch is communicatively connected to the first control module; The second isolation switch is communicatively connected to the second control module.

12. The drive control circuit according to claim 10, wherein: The second switch unit includes: a third isolating switch and a fourth isolating switch; The third isolating switch and the fourth isolating switch are connected in series to form the second switch unit; The third isolation switch is communicatively connected to the first control module; The fourth isolation switch is communicatively connected to the second control module.

13. The driving control circuit according to claim 10, wherein: The back-check module includes: a first photoelectric isolation unit, a second photoelectric isolation unit, a third photoelectric isolation unit and a fourth photoelectric isolation unit; The input end of the first photoelectric isolation unit and the input end of the third photoelectric isolation unit both receive a first check signal indicating whether the first switch unit in the gating module is turned on; The input end of the second photoelectric isolation unit and the input end of the fourth photoelectric isolation unit both receive a second check signal indicating whether the second switch unit in the gating module is turned on; The output end of the first photoelectric isolation unit and the output end of the second photoelectric isolation unit are connected to the input end of the first control module; The output end of the third photoelectric isolation unit and the output end of the fourth photoelectric isolation unit are connected to the input end of the second control module.

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