A signal interface circuit for platform screen doors

Abstract

The present invention discloses a signal interface circuit for platform screen doors, which includes a signal conversion circuit and a signal system selection circuit. The signal conversion circuit receives the signals of the first signal system, converts them and outputs them to the door control system, receives the signals of the second signal system, converts them and outputs them to the first signal system. The signal system selection circuit is provided with a first set of signal terminals connected to the first signal system, a second set of signal terminals connected to the second signal system, a third set of signal terminals connected to the door control system, and a selection signal input terminal. The signal system selection circuit connects the first set of signal terminals to the third set of signal terminals, or connects the second set of signal terminals to the third set of signal terminals according to the received selection signal. Compared with the prior art, the present invention can be compatible with two signal systems and can be flexibly used for the transformation of the existing platform control system.

Description

Technical Field

[0001] The present invention belongs to the field of platform screen door control systems, and particularly relates to a signal interface circuit for platform screen doors. Background Art

[0002] There are various existing control systems for platform screen doors. In different control systems, the control signals between the circuits for controlling the opening and closing of platform screen doors are usually incompatible with each other. This results in that when renovating a platform, if a completely new control system is adopted to replace the original control system, the renovation cost will increase; if a new control system is adopted while retaining the original control system, there will be compatibility problems with the original control system. Summary of the Invention

[0003] In order to overcome the defect of signal interface incompatibility between different control systems in the prior art, the purpose of the present invention is to provide a signal interface circuit for platform screen doors.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A signal interface circuit for platform screen doors, characterized by comprising a signal conversion circuit and a signal system selection circuit, wherein:

[0006] The signal conversion circuit is used to receive the signal of the first signal system, convert it into a signal compatible with the second signal system, and then output it to the door control system; or / and, it is used to receive the signal of the second signal system, convert it into a signal compatible with the first signal system, and then output it to the first signal system;

[0007] The signal system selection circuit is provided with a first set of signal terminals for connecting to the first signal system, a second set of signal terminals for connecting to the second signal system, a third set of signal terminals for connecting to the door control system, and a selection signal input terminal;

[0008] The door control system is compatible or matched with the signal of the second signal system;

[0009] The signal system selection circuit connects the first set of signal terminals to the third set of signal terminals, or connects the second set of signal terminals to the third set of signal terminals according to the received selection signal.

[0010] Compared with the prior art, the beneficial effects of the present invention mainly include:

[0011] 1. It can be compatible with two signal systems, can be flexibly used for renovating the existing platform control system, flexibly switch the signal source, improve the renovation construction efficiency, and reduce costs.

[0012] 2. It realizes the signal conversion between two signal systems. Other beneficial effects can also be seen in the specific content of the embodiments. Description of the Drawings

[0013] Figure 1 Principle block diagram of the signal interface circuit of the embodiment with the new signal system, the existing signal system and the door control system.

[0014] Figure 2 Principle block diagram of the signal system selection circuit of the embodiment.

[0015] Figure 3 Principle block diagram of the signal conversion circuit of the embodiment.

[0016] Figure 4 Specific circuit diagram of the occupancy signal conversion circuit of the embodiment.

[0017] Figure 5 Specific circuit diagram of the door opening signal conversion circuit of the embodiment.

[0018] Figure 6 Specific circuit diagram of the door closing signal conversion circuit of the embodiment.

[0019] Figure 7 Specific circuit diagram of the interlock release signal conversion circuit of the embodiment.

[0020] Figure 8 Specific circuit diagram of the closed and locked signal conversion circuit of the embodiment.

[0021] Figure 9 Interface schematic diagram of the signal system selection circuit in the embodiment.

[0022] Figure 10 Schematic diagram of relay KM1 in the signal conversion circuit of the embodiment.

[0023] Figure 11 Schematic diagram of the parallel connection of the coils of relays KM1 - KM4 in the signal conversion circuit of the embodiment.

[0024] Description of the drawing numbers:

[0025] 100. Signal selection circuit, 101. Selection signal input terminal, 110. First group of signal terminals, 120. Second group of signal terminals, 130. Third group of signal terminals.

[0026] 200. Signal conversion circuit, 210. Occupancy signal conversion circuit, 220. Door opening signal conversion circuit, 230. Door closing signal conversion circuit, 240. Interlock release signal conversion circuit, 250. Closed and locked signal conversion circuit.

[0027] 300. New signal system, 301. Voltage detection device.

[0028] 400. Door control system.

[0029] 500. Existing signal system. Detailed implementation manners

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] As Figure 1 and Figure 2 shown, the signal interface circuit for platform doors in this embodiment includes a signal system selection circuit 100 and a signal conversion circuit 200.

[0032] The signal system selection circuit 100 is provided with three groups of signal terminals 110, 120, 130 and a selection signal input terminal 101. Among them, the first group of signal terminals 110 is connected to the signal conversion circuit 200, and the signal conversion circuit 200 is used to connect to a new signal system 300 for receiving signals from the new signal system 300. The second group of signal terminals 120 is used to connect to the existing signal system 500 and receive signals from the existing signal system 500. The third group of signal terminals 130 is used to connect to the existing door control system 400.

[0033] Input corresponding control signals to the selection signal input terminal 101 of the signal system selection circuit 100, so that the signal system selection circuit 100 correspondingly connects the second group of signal terminals 120 and the third group of signal terminals 130, or makes the signal system selection circuit 100 correspondingly connect the first group of signal terminals 110 and the third group of signal terminals 130, thereby realizing the selection and switching of the existing signal and the new signal.

[0034] The signal interface circuit can be compatible with two signal systems and can be flexibly used to transform the existing platform control system. The new signal system 300 can be directly connected to the existing door control system 400, or the existing signal system 500 can be connected at the same time, so as to perform switching according to needs. In this way, there is no need to completely replace the door control system 400, which can not only shorten the transformation cycle, improve the efficiency, but also reduce the cost.

[0035] Refer to Figure 3 shown, the signal conversion circuit 200 includes a placeholder signal conversion circuit 210, an opening signal conversion circuit 220, a closing signal conversion circuit 230, an interlock release signal conversion circuit 240 and a closed and locked signal conversion circuit 250.

[0036] Each of the three groups of signal terminals is composed of a plurality of interfaces, and the interfaces between the three groups of signal terminals are in one-to-one correspondence.

[0037] The signals received or sent by the new signal system 300 include: occupancy signals, door opening signals, door closing signals, interlock release signals, and closed and locked signals, and the new signal system is provided with a plurality of interfaces corresponding to the foregoing signals.

[0038] The signals received or sent by the existing signal system include: enable signals, door opening signals, and closed and locked signals, and the existing signal system 500 is also provided with a plurality of interfaces corresponding to the foregoing signals.

[0039] The structures of the new signal system 300 and the existing signal system 500 themselves are prior arts and are not the parts improved by the present invention, so they will not be described in detail.

[0040] The second set of signal terminals 120 has the same composition as the first set of signal terminals 110, except that each interface of the first set of signal terminals 110 is correspondingly connected to the occupancy signal conversion circuit 210, door opening signal conversion circuit 220, door closing signal conversion circuit 230, interlock release signal conversion circuit 240, and closed and locked signal conversion circuit 250, while each interface of the second set of signal terminals 120 is correspondingly connected to the enable signal interface, door opening signal interface, and closed and locked signal interface of the existing signal system 500.

[0041] Reference Figure 4 As shown, the occupancy signal conversion circuit 210 is provided with an occupancy signal input interface 211 and three conversion signal output interfaces 212, 213, 214, wherein: two output interfaces 212, 213 are redundant with each other, and these two output interfaces 212, 213 are equivalent to the enable signal interface of the existing signal system 500 and are used to connect to the enable signal input terminal of the door control system to realize the conversion between the occupancy signal and the existing platform door enable signal.

[0042] Preferably, the occupancy signal conversion circuit 210 is composed of a relay KS11. The relay KS11 includes two pairs of normally closed contacts, which constitute the two conversion signal output interfaces 212, 213 of the occupancy signal conversion circuit 210, and the two coil contacts of the relay KS11 constitute the occupancy signal input interface 211.

[0043] Further, the relay KS11 is also provided with a pair of normally open contacts, which constitute the third output interface 214 of the occupancy signal conversion circuit 210. One of the normally open contacts is connected to VCC+, and the other normally open contact is simultaneously connected to a coil contact of each of the relays K51 and K52. The other coil contacts of the relays K51 and K52 are connected to GND, and the coils of the two relays are connected in parallel. Among them, each of the relays K51 and K52 is provided with multiple pairs of normally closed contacts, which are connected in parallel with the enable signals of multiple corresponding PSLs (local control panels) at, for example, the head, middle, and tail parts of the platform, respectively, for inputting the enable signals to the PSLs.

[0044] When the occupancy signal is valid, the relays K51 and K52 are energized, and their enable signals are input to the corresponding PSLs, allowing the interlock release switch to be directly operated on the PSL to enable the train to leave the platform.

[0045] When the occupancy signal is invalid, the relays K51 and K52 are de-energized, so they cannot input the enable signal to the PSL. At this time, the IBP (central control panel) needs to enable the PSL to operate the PSL. Both the IBP and the PSL are prior arts and will not be elaborated here.

[0046] In the relay KS11, when it is energized, the normally closed contact pair is disconnected, and the normally open contact pair is connected.

[0047] Further, a relay K1 is also connected in parallel between the two coil contacts of the relay KS11 to detect whether the train issues an occupancy signal, and this signal is input to, for example, the integrated monitoring system of the subway for detection. Among them, when the voltage input between the two coil contacts of the relay KS11 can energize the relay K1, the contacts at its output end are connected or disconnected, generating a switch signal, and then it can be determined whether the occupancy signal is valid.

[0048] Reference Figure 5 As shown, the door opening signal conversion circuit 220 is provided with a door opening signal input interface 221. At the same time, it is also provided with two conversion signal output interfaces 222 and 223. The two output interfaces 222 and 223 are redundant and are used to connect to the door opening signal interface of the door control system 500 to realize the conversion of the new door opening signal and the existing platform door opening signal.

[0049] Preferably, the door opening signal conversion circuit 220 is constituted by a relay KS12. The relay KS12 also includes two pairs of normally open contacts, which constitute the two conversion signal output interfaces 222 and 223 of the door opening signal conversion circuit 220, and the two coil contacts of the relay KS12 constitute the door opening signal input interface 221.

[0050] Further, a relay K2 is also connected in parallel between the two coil contacts of the relay KS12 to detect whether the train issues a door opening signal, and this signal is input into the integrated monitoring system of the subway for detection.

[0051] Reference Figure 6 As shown, the door closing signal conversion circuit 230 is provided with a door closing signal input interface 231 and two conversion signal output interfaces 232, 233.

[0052] Preferably, the door closing signal conversion circuit 230 is composed of a relay KS13. The two coil contacts of the relay KS13 form the door closing signal input interface 231. The relay KS13 also includes:

[0053] Two pairs of normally open contacts form the two conversion signal output interfaces 232, 233 of the door closing signal conversion circuit 230.

[0054] In some optional cases, the door closing signal conversion circuit 230 may not be provided. When the door closing signal conversion circuit 230 is provided, its two conversion signal output interfaces 232, 233 are used to connect to the door closing signal interface of the door control system 500 to realize the conversion of the new door closing signal and the existing platform door closing signal. In addition, it can also be used to output the door closing signal for door closing signal detection, specifically connect to the system that needs to receive this signal and transmit the signal.

[0055] Further, the relay KS12 is also provided with two pairs of normally closed contacts, which respectively form the third conversion signal output interface 224 and the fourth conversion signal output interface 225 of the door opening signal conversion circuit 220. The two contacts of the input interface of the door closing signal conversion circuit 230 are respectively connected in series with one contact of the conversion signal output interface 224 and one contact of the conversion signal output interface 225 of the door opening signal conversion circuit 220, and the other contact of the conversion signal output interface 224 and the other contact of the conversion signal output interface 225 are used to connect and input the door closing signal. When the relay KS12 is powered on, the conversion signal output interface 224 and the conversion signal output interface 225 are disconnected, so that the input end of the relay KS13 is isolated and disconnected. At this time, even if there is a door closing signal input, it cannot be input into the relay KS13 to make it energized. With this setting, when the door opening signal is valid, the door closing signal conversion circuit is locked.

[0056] As an alternative embodiment, the door closing signal conversion circuit 230 is further provided with two other conversion signal output interfaces 234 and 235, which are respectively connected in series with two contacts of the input interface of the door opening signal conversion circuit 220. The conversion signal output interface 234 and the conversion signal output interface 235 may specifically be composed of two pairs of normally closed contacts of the relay KS13. Referring to the above door opening signal locking door closing signal conversion circuit, when the relay KS13 is energized, the conversion signal output interface 234 is disconnected, so that KS12 loses power, and the interlock between the door closing signal and the door opening signal can be realized.

[0057] The conversion signal output interfaces 224 and 225 and the conversion signal output interfaces 234 and 235 are used for the interlock of the door closing signal and the door opening signal, that is, there cannot be both a door opening signal and a door closing signal at the same time. When one signal is valid, the other signal is made invalid.

[0058] Further, a relay K3 is connected in parallel between the two coil contacts of the relay KS13 to detect whether the train issues a door closing signal, and at the same time, this signal is input to the integrated monitoring system of the subway for detection.

[0059] Refer to Figure 7 As shown, the interlock release signal conversion circuit 240 is provided with a closed and locked signal input interface 241. In addition, the interlock release signal conversion circuit 240 is further provided with two conversion signal output interfaces 242 and 243 for connecting to the interlock release signal interface of the new signal system.

[0060] Preferably, the interlock release signal conversion circuit 240 is composed of a relay KS14. The relay KS14 also includes two pairs of normally open contacts, which constitute the two conversion signal output interfaces 242 and 243 of the interlock release signal conversion circuit 240, and the two coil contacts of the relay KS14 constitute the interlock release signal input interface 241.

[0061] The interlock release signal input interface 241 is used to receive the interlock release signal issued by the PSL of the door control system. In the existing door control system, no separate interlock release signal interface is provided, and the interlock release signal is obtained by connecting to the closed and locked signal interface of the door control system. Specifically, the PSL of the door control system is provided with two pairs of normally open interface contacts. Among them, one pair of contacts is used to output a closing signal, and the other pair of contacts is used to output a locking signal. One contact of the interlock release signal input interface 241 is connected to one contact of the PSL for outputting the closing signal, and the other contact of the interlock release signal input interface 241 is connected to one contact of the PSL for outputting the locking signal.

[0062] Two contacts of the conversion signal output interface 242 are correspondingly connected to the interfaces S1P+ and S10+ of the new signal system 300, and two contacts of the conversion signal output interface 243 are correspondingly connected to the interfaces S1P- and S10- of the new signal system 300, corresponding to the power supply and signals of the new signal system 300 respectively.

[0063] It can be determined that the closing and locking signals are valid only when both of the two conversion signal output interfaces 242 and 243 of the interlock release signal conversion circuit 240 have outputs.

[0064] There is a certain potential difference between the interfaces S10+ and S10- of the new signal system 300. Generally, S1P+ and S10+ are equipotential points, and S1P- and S10- are equipotential points.

[0065] Furthermore, a relay K4 is also connected between two contacts of the relay KS14 that are correspondingly connected to the interfaces S10+ and S10- of the new signal system 300. The operating voltage of the relay K4 corresponds to or is slightly smaller than the potential difference between the interfaces S10+ and S10-. In this way, when the output signal of the relay KS14 is valid, the relay K4 is energized and outputs a signal to detect whether the interlock release signal sent by the platform door system is valid, and at the same time, this signal is input to the integrated monitoring system for detection.

[0066] Reference Figure 8 As shown, the closing and locking signal conversion circuit 250 is provided with a closing and locking signal input interface 251. In addition, the closing and locking signal conversion circuit 250 is also provided with two conversion signal output interfaces 252 and 253.

[0067] Preferably, the closing and locking signal conversion circuit 250 is composed of a relay KS15. The relay KS15 also includes two pairs of normally open contacts, which constitute the two conversion signal output interfaces 252 and 253 of the closing and locking signal conversion circuit 250. The two coil contacts of the relay KS14 then constitute the closing and locking signal input interface 251. One coil contact is connected to one contact of the PSL for outputting the closing signal, and the other contact for outputting the closing signal is used to connect to VCC. The other coil contact is connected to one contact of the PSL for outputting the locking signal, and the other contact for outputting the locking signal is used to connect to GND.

[0068] The two contacts of the conversion signal output interface 252 are respectively used to connect with the interface CLSD+ and the interface S1P+ of the new signal system 300, and the two contacts of the conversion signal output interface 253 are respectively used to connect with the interface CLSD- and the interface S1P- of the new signal system 300. When both of the two conversion signal output interfaces 252 and 253 have outputs, it is determined that the closing and locking signal is valid.

[0069] Further, a relay K5 is connected in parallel between the two contacts of the relay KS15 that are used to connect with the interface CLSD+ and the interface CLSD- to detect whether the closing and locking signal sent by the platform door system is valid, and at the same time, this signal is input into the integrated monitoring system of the subway to realize the detection.

[0070] As an implementation manner, the signal system selection circuit 100 is composed of relays. Since there are a relatively large number of interfaces involved, in this embodiment, it is preferably to use multiple relays connected in parallel to form the signal system selection circuit 100 to reduce costs. Alternatively, relays that can provide the corresponding number of interfaces can also be customized, and the present invention does not limit this.

[0071] Combined with Figure 9 As shown, specifically, the second group of signal terminals 120 includes interfaces 1201 to 1216. The third group of signal terminals 130 has the same composition as the second group of signal terminals 120, including interfaces 1301 to 1316. The difference is that each interface of the third group of signal terminals 130 is used to connect with each interface of the existing door control system 500 correspondingly.

[0072] Each interface of the second group of signal terminals 120 corresponds to the third signal terminal 130; the first group of signal terminals 110 includes interfaces 1101 to 1116, which also corresponds to the third signal terminal 130. The connection relationship and working principle are introduced in detail below through the third group of signal terminals 130.

[0073] In the third group of signal terminals 130:

[0074] Interfaces 1301 and 1302 are used to send an enabling signal to the door control system 500. Interfaces 1303 and 1304 are redundantly set for interfaces 1301 and 1302 and are also used to send an enabling signal.

[0075] When a new signal system is selected for access, Interface 1301 and Interface 1302 are connected one-to-one with Interface 1101 and Interface 1102, and Interface 1303 and Interface 1304 are connected one-to-one with Interface 1103 and Interface 1104. Interface 1101 and Interface 1102 are electrically connected one-to-one with two contacts of a conversion signal output interface 212 of the placeholder signal conversion circuit 210, and Interface 1103 and Interface 1104 are electrically connected one-to-one with two contacts of another conversion signal output interface 213 of the placeholder signal conversion circuit. Its placeholder signal is input from the placeholder signal input interface 211, and after conversion, it is output from the two conversion signal output interfaces 212 and 213, through the interfaces 1101 - 1104 at the first signal end and the corresponding interfaces 1301 - 1304. Thus, the conversion and output of the placeholder signal are completed, and finally, it is input into the existing door control system.

[0076] Interfaces 1305 and 1306 are used to send an opening signal to the door control system 500. Interfaces 1307 and 1308 are redundantly set for Interfaces 1305 and 1306 and are also used to send an opening signal. Among them, the specific circuit connection is basically the same as that of the above Interfaces 1301 - 1304 and will not be elaborated here. The main difference is that the corresponding Interfaces 1105 and 1106 are connected to two contacts of Interface 222, and Interfaces 1107 and 1108 are connected to two contacts of Interface 223.

[0077] Interfaces 1309 and 1310 are used to receive the interlock release signal sent by the door control system 500. This signal is sent to the interlock release signal conversion circuit 240 through Interface 1109, Interface 1110, and Interface 241 connected to these two interfaces. After signal conversion, it is input into the new signal system 300 through its two conversion signal output interfaces 242 and 243.

[0078] Interfaces 1311 and 1312 are used to receive the closing and locking signal sent by the door control system 500. Among them, the specific circuit connection is basically the same as that of the above Interfaces 1309 and 1310 and will not be elaborated here. The main difference is that the corresponding Interfaces 1111 and 1112 are connected to Interface 251.

[0079] In different project implementation modes, for existing signal control systems of specific different models, the door closing signal is optional. Therefore, in this embodiment, the third set of signal terminals 130 are also optionally provided with interfaces 1313 and 1314 for sending a door closing signal to the door control system 500. Correspondingly, the interfaces 1313 and 1314 can be connected to the interfaces 1113 and 1114, and the interfaces 1113 and 1114 are connected to two contacts of the interface 232; or further provided with interfaces 1315 and 1316 that are redundant with the interfaces 1313 and 1314. The interfaces 1315 and 1316 can be connected to the interfaces 1115 and 1116, and the interfaces 1115 and 1116 are connected to two contacts of the interface 233.

[0080] Preferably, the signal system selection circuit 100 includes four relays, namely, relay KM1, relay KM2, relay KM3, and relay KM4.

[0081] The relay KM1 is provided with four sets of contacts from the first to the fourth. Each set of contacts includes a first contact, a second contact, and a third contact, where:

[0082] The first contact of the first set of contacts constitutes the interface 1101, the second contact of the first set of contacts constitutes the interface 1201, and the third contact of the first set of contacts constitutes the interface 1301;

[0083] The first contact of the second set of contacts constitutes the interface 1102, the second contact of the second set of contacts constitutes the interface 1202, and the third contact of the second set of contacts constitutes the interface 1302;

[0084] The first contact of the third set of contacts constitutes the interface 1103, the second contact of the third set of contacts constitutes the interface 1203, and the third contact of the third set of contacts constitutes the interface 1303;

[0085] The first contact of the fourth set of contacts constitutes the interface 1104, the second contact of the fourth set of contacts constitutes the interface 1204, and the third contact of the fourth set of contacts constitutes the interface 1304.

[0086] The relay KM2 is provided with a total of four groups of contacts, namely the fifth to the eighth groups of contacts. The relay KM3 is provided with a total of four groups of contacts, namely the ninth to the twelfth groups of contacts. The relay KM4 is provided with the thirteenth and fourteenth groups of contacts. Similar to the relay KM1, each group of contacts of the relays KM2 - KM4 also includes a first contact, a second contact, and a third contact. Among them, referring to the above-mentioned relay KM1, by the same token, for the relays KM2 - KM4, the first contact of the nth group of contacts correspondingly constitutes the interface 110n, the second contact of the nth group of contacts correspondingly constitutes the interface 120n, and the third contact of the nth group of contacts correspondingly constitutes the interface 130n. Herein, the character "n" in "110n, 120n, 130n" corresponds identically to the character "n" in "the nth group of contacts". Based on the foregoing corresponding relationship, the setting of each group of contacts of the relays KM2 - KM4 will not be elaborated any further.

[0087] Among each group of contacts of the relays KM1 - KM4, it is normally open between the first contact and the third contact, and normally closed between the second contact and the third contact.

[0088] Refer to Figure 10 As shown, the four first contacts 1 of the relay KM1 are connected to the interfaces 1101, 1102, 1103, and 1104 in a one-to-one manner. The four second contacts 2 are connected to the interfaces 1201, 1202, 1203, and 1204 in a one-to-one manner. The four third contacts 3 are connected to the interfaces 1301, 1302, 1303, and 1304 in a one-to-one manner.

[0089] The relays KM2 - KM4 are basically the same as the relay KM1, so they will not be elaborated any further.

[0090] Under the above connection relationship: when no operation is performed, that is, when the relays KM1 - KM4 are all in a de-energized state, the default door control system is connected to the existing signal system; when the relays KM1 - KM4 are energized simultaneously, the first contact and the third contact in each group of contacts are connected, and the second contact and the third contact are disconnected, and the door control system is connected to the new signal system, switching the existing signal system to the new signal system. The above is just one connection method. Obviously, it is also possible to connect the door control system to the new signal system when the relays KM1 - KM4 are all in a de-energized state, and switch to the existing signal system after being energized.

[0091] In the solution where the signal system selection circuit 100 is constituted by relays, the control signal terminal of the signal system selection circuit 100 is constituted by the coil terminals of the relays. In the case where the signal system selection circuit 100 is constituted by a total of four relays, namely relay KM1, relay KM2, relay KM3, and relay KM4, the coil contacts of the four relays are connected in parallel, and synchronous switching can be achieved. It is easy to understand that the method of independently controlling each relay and asynchronous switching is slightly more complex, but the present invention does not limit this.

[0092] The signal system selection circuit 100 can also be constituted by existing technologies such as optocoupler circuits and COMS transistors that also have switching functions. Referring to the above-mentioned relays, the signal system selection circuit includes multiplexed selection signals. Since the selection principles of each signal are the same, here, taking the realization of one-way signal selection by two optocouplers as an example: the input terminals of the two optocouplers serve as the control signal terminals of the signal system selection circuit; the two output terminals of one of the optocouplers are correspondingly used to connect to a new signal system and a door control system, and the two output terminals of the other optocoupler are correspondingly used to connect to an existing signal system and a door control system. By controlling the switching signals input to the two optocouplers, the switching of the signal system can be achieved.

[0093] Refer to Figure 11 As shown, preferably, the coil contacts of the relays KM1 - KM4 are connected in parallel, and the coil contacts of the relays KM1 - KM4 are connected to the normally open contacts of the selection switch S1. When S1 operates, the normally open contacts close, causing the coils of the relays KM1 - KM4 to be energized, and the corresponding contacts act, thereby realizing the switching between the new and old signal systems.

[0094] Combined with Figures 4 - 8 As shown, further, a voltage detection device 301 is connected between the two coil contacts of each of the relays KS11, KS12, and KS13. A voltage detection device 301 is connected between the two contacts of the relay KS14 used to connect to the interfaces S1P + and S1P - and between the two contacts used to connect to the interfaces S10 + and S10 -. A voltage detection device 301 is also connected between the two contacts of the relay KS15 used to connect to the interfaces CLSD + and CLSD -. The multiple voltage detection devices 301 are used to collect the voltage between the corresponding contact pairs, and further judge whether each signal is valid according to the collected voltage values. Or it is also possible to combine the voltage detection device with the relays K1 - K5 to judge whether the corresponding input or output signal is valid.

[0095] In other embodiments, the relays KS11 - KS15 can also be replaced with other existing types of switch control devices, such as optocouplers, COMS transistors, etc. The only difference lies in the specific circuit wiring methods of different types of switch control devices. However, the adaptive modification of the corresponding wiring methods is a well - known technical means in the art and will not be elaborated here.

[0096] The embodiments in the present invention are only used to illustrate the present invention and do not constitute a limitation on the scope of the claims. Other substantially equivalent alternatives that can be conceived by those skilled in the art are all within the protection scope of the present invention.

Claims

1. A signal interface circuit for platform screen doors, characterized in that it includes a signal conversion circuit and a signal system selection circuit, wherein: The signal conversion circuit is used to receive the signal of the first signal system, and after converting it into a signal compatible with the second signal system, output it to the door control system; or / and, it is used to receive the signal of the second signal system, and after converting it into a signal compatible with the first signal system, output it to the first signal system; The signal system selection circuit is provided with a first set of signal terminals for connecting to the first signal system, a second set of signal terminals for connecting to the second signal system, a third set of signal terminals for connecting to the door control system, and a selection signal input terminal; The door control system is compatible or matched with the signal of the second signal system; The signal system selection circuit connects the first set of signal terminals to the third set of signal terminals according to the received selection signal, or connects the first set of signal terminals to the third set of signal terminals; The signal conversion circuit includes: An occupancy signal conversion circuit, which is used to convert the received occupancy signal of the first signal system into an enabling signal compatible with the second signal system and then input it into the door control system; or, An opening signal conversion circuit, which is used to convert the received opening signal of the first signal system into an opening signal compatible with the second signal system and then input it into the door control system; or, A closing signal conversion circuit, which is used to convert the received opening signal of the first signal system into a closing signal compatible with the second signal system and then input it into the door control system; or, An interlock release signal conversion circuit, which is used to convert the received closed and locked signal of the door control system into an interlock release signal compatible with the first signal system and then input it into the first signal system; or, A closed and locked signal conversion circuit, which is used to convert the received closed and locked signal of the door control system into a closed and locked signal compatible with the first signal system and then input it into the first signal system.

2. The signal interface circuit according to claim 1, characterized in that The occupancy signal conversion circuit is provided with an occupancy signal input interface and a conversion signal output interface composed of at least a pair of normally closed contacts; The opening signal conversion circuit is provided with an opening signal input interface and a conversion signal output interface composed of at least a pair of normally open contacts; The closing signal conversion circuit is provided with a closing signal input interface and a conversion signal output interface composed of at least a pair of normally open contacts; The interlock release signal conversion circuit is provided with a closed and locked signal input interface and a conversion signal output interface composed of two pairs of normally open contacts; The closed and locked signal conversion circuit is provided with a closed and locked signal input interface and a conversion signal output interface composed of two pairs of normally open contacts.

3. The signal interface circuit according to claim 2, characterized in that The occupancy signal conversion circuit is further provided with another conversion signal output interface composed of a pair of normally open contacts, one of its contacts is used to connect to VCC, and the other contact is used to connect the coil of the relay group between it and GND; The relay group includes at least one relay. If it is composed of multiple relays, the coil contacts of each relay are connected in parallel. The relay group is provided with several pairs of normally closed contacts, which are correspondingly used to output enable signals to several PSLs on the platform.

4. The signal interface circuit according to claim 2, characterized in that the occupancy signal conversion circuit is composed of a relay KS11, and two coil contacts of the relay KS11 form the occupancy signal input interface; a relay K1 is connected in parallel between the two coil contacts of the relay KS11 and / or a voltage detection circuit or device for detecting the voltage between the two coil contacts of the relay KS11 is provided, which is used to judge whether the occupancy signal is valid.

5. The signal interface circuit according to claim 2, characterized in that the door opening signal conversion circuit is composed of a relay KS12, and two coil contacts of the relay KS12 form the door opening signal input interface; a relay K2 is connected in parallel between the two coil contacts of the relay KS12 and / or a voltage detection circuit or device for detecting the voltage between the two coil contacts of the relay KS12 is provided, which is used to judge whether the door opening signal is valid.

6. The signal interface circuit according to claim 2, characterized in that the door closing signal conversion circuit is composed of a relay KS13, and two coil contacts of the relay KS13 form the door closing signal input interface; a relay K3 is connected in parallel between the two coil contacts of the relay KS13 and / or a voltage detection circuit or device for detecting the voltage between the two coil contacts of the relay KS13 is provided, which is used to judge whether the door closing signal is valid.

7. The signal interface circuit according to claim 2, characterized in that the door opening signal conversion circuit is composed of a relay KS12, and two coil contacts of the relay KS12 form the door opening signal input interface; the door closing signal conversion circuit is composed of a relay KS13, and two coil contacts of the relay KS13 form the door closing signal input interface; wherein: the relay KS12 is provided with two pairs of normally closed contacts, one pair of contacts is used to be connected in series with one coil contact of the relay KS13, and the other pair of contacts is used to be connected in series with the other coil contact of the relay KS13. When the relay KS12 is powered on, the coil of the relay KS13 is isolated and disconnected; and / or, the relay KS13 is provided with two pairs of normally closed contacts, one pair of contacts is used to be connected in series with one coil contact of the relay KS12, and the other pair of contacts is used to be connected in series with the other coil contact of the relay KS12. When the relay KS13 is powered on, the coil of the relay KS12 is isolated and disconnected.

8. The signal interface circuit according to claim 2, characterized in that the interlock release signal conversion circuit is composed of a relay KS14, and two coil contacts of the relay KS14 form the closed and locked signal input interface.

9. The signal interface circuit according to claim 2, characterized in that between one contact of one pair of normally open contacts and one contact of the other pair of normally open contacts of the interlock release signal conversion circuit: a relay K4 is connected and is connected to the coil contact of the relay K4; and / or, There is a voltage detection circuit or device for detecting the voltage between the other contact of one pair of normally open contacts and the other contact of the other pair of normally open contacts in the interlock release signal conversion circuit, and a voltage detection circuit or device for detecting the voltage between one coil contact of relay K4 and the other pair of normally open contacts or the other contact of the one pair of normally open contacts; Among the two pairs of normally open contacts of the interlock release signal conversion circuit, one pair of contacts is an equipotential point, the other pair of contacts is an equipotential point, and there is a certain potential difference between the one pair of normally open contacts and the other pair of normally open contacts when valid; The relay K4, voltage detection circuit or device is used to judge whether the output interlock release signal is valid.

10. The signal interface circuit according to claim 2, characterized in that, The close and lock signal conversion circuit is composed of relay KS15, and the two coil contacts of relay KS15 constitute the close and lock signal input interface.

11. The signal interface circuit according to claim 10, characterized in that, Among the two pairs of normally open contacts of the close and lock signal conversion circuit: a relay K5 is connected between one contact of one pair of normally open contacts and one contact of the other pair of normally open contacts and is connected to the coil contact of relay K5; and / or, there is a voltage detection circuit or device for detecting the voltage between the two coil contacts of relay K5; There is a certain potential difference in the voltage between the two coil contacts of relay K5 when the output signal is valid; The relay K5, voltage detection circuit or device is used to judge whether the output close and lock signal is valid.

12. The signal interface circuit according to claim 1, characterized in that, The signal system selection circuit is composed of one signal system selection circuit or multiple relays with their coil contacts connected in parallel, and several contact groups are provided, where: Each contact group includes contact 1, contact 2 and contact 3. The contact 1 of each contact group together constitutes the first group of signal terminals, the contact 2 of each contact group together constitutes the second group of signal terminals, and the contact 3 of each contact group together constitutes the third group of signal terminals; When the relay of the signal system selection circuit is powered on or powered off, the contact 1 and contact 3 in each contact group are connected or the contact 2 and contact 3 in each contact group are connected; The coil contact of the relay of the signal system selection circuit constitutes the selection signal input terminal; A switch circuit for controlling whether to connect power to it is connected in series to the selection signal input terminal.

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