Multipath output switching circuit and railway signal power supply screen

Abstract

The invention discloses a multi-path output switching circuit and a railway signal power supply screen. The multi-path output switching circuit comprises a multi-path output switching device and a main loop, the main loop comprises a plurality of main relays KA and a plurality of control relays KC; the multipath output switching device comprises a detection circuit, an auxiliary power supply and a control circuit, the detection circuit is respectively connected with the auxiliary power supply and the control circuit; the auxiliary power supply is connected with the control circuit; the auxiliary power supply is used for providing working power for the detection circuit and the control circuit; and the control circuit is used for controlling to switch on the emergency power supply B according to the control signal output by the detection circuit. According to the invention, when one or more AC power supply outputs (i.e., the power supply of the AC load) of the railway signal power supply screen fail and power failure occurs, the emergency power supply continuously supplies power to the AC load, so that the normal operation of the AC load is ensured, and great practical significance is achieved.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, specifically to the field of railway signal power supply panel technology, and in particular to a multi-channel output switching circuit and a railway signal power supply panel. Background Art

[0002] Railway signal power supply panel is a power supply system used in the railway industry to power station signal equipment. Railway signal power supply panel not only provides DC power for relays, coding equipment, station connection, DC switch and other equipment, but also needs to provide AC power for turnout indication, signal machine, interlocking equipment, centralized monitoring and other equipment.

[0003] Among them, the DC power supply can improve the stability and reliability of the system by setting up a parallel module, while the AC power supply usually improves the reliability of the railway signal power supply screen system by setting up an emergency power supply. However, due to the large number of AC power outputs, more emergency power supplies are required, which not only increases the overall power consumption of the railway signal power supply screen system, but also increases the overall construction cost of the railway signal power supply screen system.

[0004] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-channel output switching circuit and a railway signal power supply panel in view of the technical defects existing in the prior art.

[0006] To this end, the present invention provides a multi-channel output switching circuit, which includes: a multi-channel output switching device and a main circuit;

[0007] The main circuit includes: a plurality of main relays KA and a plurality of control relays KC;

[0008] The two ends of the coil of each main relay KA are connected to the live wire terminal L and the neutral wire terminal N of the conventional power supply A respectively;

[0009] The third and fifth contacts of each main relay KA are connected to the live terminal L and the neutral terminal N of the conventional power supply A respectively;

[0010] The 4th and 6th contacts of each main relay KA are respectively connected to the live input terminal L and the neutral input terminal N of an AC load F;

[0011] The seventh contact of each main relay KA is connected to the detection circuit in the multi-channel output switching device;

[0012] The 8th contact of each main relay KA is connected to GND1;

[0013] The 8th and 4th contacts of each control relay KC are connected to the live terminal L and the neutral terminal N of the emergency power supply B respectively;

[0014] The sixth contact and the second contact of each control relay KC are respectively connected to the live input terminal L and the neutral input terminal N of an AC load F;

[0015] Both ends of the coil of each control relay KC are connected to the control circuit in the multi-channel output switching device;

[0016] Among them, the multi-channel output switching device includes: a detection circuit, an auxiliary power supply and a control circuit;

[0017] A detection circuit is connected to the auxiliary power supply and the control circuit respectively;

[0018] Auxiliary power supply, connected to the control circuit;

[0019] The detection circuit is used to determine the power supply status of the main circuit and output a control signal to the control circuit when a power failure occurs in the power supply to any AC load F in the main circuit;

[0020] Auxiliary power supply, used to provide working power to the detection circuit and control circuit;

[0021] The control circuit is used to control the emergency power supply B to ensure the power supply to the AC load F according to the control signal output by the detection circuit.

[0022] In addition, the present invention also provides a railway signal power supply panel, which includes the multi-channel output switching circuit as described above.

[0023] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides a multi-channel output switching circuit and a railway signal power supply panel with scientific design. The present invention provides an automatic switching circuit with reasonable structure, strong practicality and high reliability, which can realize multi-channel output of the railway signal power supply panel. When one or more AC power outputs (i.e., the power supply of one or more AC loads) of the railway signal power supply panel with the multi-channel output switching circuit fail and a power outage occurs, the emergency power supply (specifically the emergency power supply backup circuit) can be automatically switched to continue to supply power to the AC load to ensure the normal operation of the AC load, which has great practical significance.

[0024] By applying the present invention, the state of the output power supply (ie, the power supply of the AC load F) can be automatically detected, and the emergency power supply can be automatically switched in case of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the overall working principle of a multi-channel output switching circuit provided by the present invention, that is, an electrical connection diagram of a multi-channel output switching device and a main circuit;

[0026] Figure 2 It is an electrical schematic diagram of a control relay in a multi-channel output switching circuit provided by the present invention;

[0027] Figure 3 It is an electrical schematic diagram of a main relay in a multi-channel output switching circuit provided by the present invention;

[0028] Figure 4 It is an electrical principle diagram of a multi-channel output switching device in a multi-channel output switching circuit provided by the present invention;

[0029] Figure 5 It is a principle diagram of a detection circuit included in a multi-channel output switching device in a multi-channel output switching circuit provided by the present invention;

[0030] Figure 6 It is a schematic diagram of an auxiliary power supply included in a multi-channel output switching device in a multi-channel output switching circuit provided by the present invention;

[0031] Figure 7 It is a schematic diagram of a control circuit included in a multi-channel output switching device in a multi-channel output switching circuit provided by the present invention;

[0032] In the figure: KA-main relay (i.e. main circuit relay); KC-control relay;

[0033] J1-terminal; F1-fuse; RV-varistor; R1-resistor; U1-power module; U2-power conversion chip; C1-capacitor; C2-capacitor; C3-capacitor; C4-capacitor; U3-MCU;

[0034] C5-capacitor; C6-capacitor; C7-capacitor; C8-capacitor; C9-capacitor; C10-capacitor; C11-capacitor; R2-resistor; R3-resistor; R4-resistor; R6-resistor; Y1-crystal oscillator;

[0035] R15-resistor; R16-resistor; R17-resistor; R18-resistor; Q3-transistor; Q4-transistor; TF2-optocoupler; D2-diode. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0037] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] See also Figures 1 to 7 , the present invention provides a multi-channel output switching circuit, comprising: a multi-channel output switching device and a main circuit;

[0040] The main circuit includes: a plurality of main relays KA (for example, 1KA to nKA), and a plurality of control relays KC (for example, 1KC to nKC);

[0041] The two ends of the coil of each main relay KA are connected to the live wire terminal L and the neutral wire terminal N of the conventional power supply A respectively;

[0042] The third contact (normally open contact) and the fifth contact (normally open contact) of each main relay KA (i.e. main circuit relay) are connected to the live wire terminal L and the neutral wire terminal N of the conventional power supply A respectively;

[0043] The 4th contact (normally open contact) and the 6th contact (normally open contact) of each main relay KA are respectively connected to the live input terminal L and the neutral input terminal N of an AC load F (i.e., AC electrical equipment);

[0044] It should be noted that a plurality of main relays KA (eg, 1KA to nKA) in the main circuit are connected to a plurality of AC loads F (eg, F1 to Fn), respectively.

[0045] The seventh contact (normally closed contact) of each main relay KA is connected to the detection circuit in the multi-channel output switching device;

[0046] The 8th contact (normally closed contact) of each main relay KA is connected to GND1 (i.e. grounded);

[0047] The 8th contact (normally open contact) and the 4th contact (normally open contact) of each control relay KC are connected to the live wire terminal L and the neutral wire terminal N of the emergency power supply B respectively;

[0048] The sixth contact (normally open contact) and the second contact (normally open contact) of each control relay KC are respectively connected to the live input terminal L and the neutral input terminal N of an AC load F (i.e., AC electrical equipment);

[0049] Both ends of the coil of each control relay KC are connected to the control circuit in the multi-channel output switching device;

[0050] Among them, the multi-channel output switching device includes: a detection circuit, an auxiliary power supply and a control circuit;

[0051] A detection circuit is connected to the auxiliary power supply and the control circuit respectively;

[0052] Auxiliary power supply, connected to the control circuit;

[0053] The detection circuit is used to determine the power supply status of the main circuit and output a control signal to the control circuit when a power failure occurs in the power supply to any AC load F in the main circuit;

[0054] It should be noted that the detection circuit is specifically used to: detect the state of each main relay KA in the main circuit, and output a control signal to the control circuit when the coil of one or more main relays KA loses power and is released (i.e., disconnected from the AC load F due to a power supply failure of one or more AC loads F);

[0055] Auxiliary power supply, used to provide working power to the detection circuit and control circuit;

[0056] The control circuit is used to control (specifically by controlling the control relay KC in the main circuit) the emergency power supply B according to the control signal output by the detection circuit to ensure continuous power supply to the AC load F.

[0057] In the present invention, it should be noted that the detection circuit includes a single-chip microcomputer minimum system composed of components such as a single-chip microcomputer, a resistor, a crystal oscillator, etc. The auxiliary power supply includes a power module and a power conversion chip. The control circuit is a driving circuit for controlling the relay KC.

[0058] It should be noted that in the present invention, the detection circuit in the multi-channel output switching device can automatically detect the state of each main relay KA in the main circuit. When the coil of one or more main relays KA in the main circuit loses power and is released (that is, the connection with the AC load F is disconnected, that is, the power supply is disconnected due to a failure in the power supply of the AC load F, for example, a failure in the conventional power supply A), the emergency power supply B is automatically connected through the control circuit; and the multi-channel output switching device can set a delay time to avoid the situation where the relays of the conventional power supply and the emergency power supply B (that is, the main relay KA and the control relay KC) compete for suction when power is turned on at the same time.

[0059] In the present invention, the multi-channel output switching device is used to determine the power supply status of the main circuit through the detection circuit therein, and when a power failure occurs in the power supply to any AC load F in the main circuit, the control circuit therein controls the control relay KC in the main circuit to connect the emergency power supply B to ensure continuous power supply to the AC load F.

[0060] In the present invention, in a specific implementation, the conventional power supply A is the power provided by the original AC bus on the railway signal power supply panel when the railway signal power supply panel is working normally, usually a voltage value between AC 176V and AC253V, for example, it can be AC220V, specifically AC mains 220V.

[0061] In the present invention, in specific implementation, the emergency power supply B is an uninterruptible power supply UPS, which can be the power output of the original uninterruptible power supply UPS in the railway signal power supply panel. The output voltage of the emergency power supply B is usually a voltage value between AC 213.4V and AC226.6V, for example, it can be AC220V. There are many mature application models of uninterruptible power supply UPS, such as the uninterruptible power supply UPS model FR-UK3340 produced by Xiamen Kehua Co., Ltd., which has three-phase input and three-phase output and a rated power of 40KVA. When the external power grid is cut off, the uninterruptible power supply UPS will discharge through its own battery to maintain the uninterruptible output of the power supply.

[0062] In the present invention, see Figure 4 , Figure 5 , the detection circuit includes a single chip microcomputer U3, resistors R2 to R4, resistor R6, capacitors C5 to C11 and a crystal oscillator Y1;

[0063] Resistor R2 and crystal oscillator Y1 are connected in parallel and connected to pins 5 and 6 of U3;

[0064] Pin 5 of the microcontroller U3 is connected to GND1 (ground) through capacitor C5;

[0065] Pin 6 of the microcontroller U3 is connected to GND1 (ground) through capacitor C6;

[0066] Pin 5 and pin 6 of the single chip computer U3 are also connected to both ends of the resistor R2 and both ends of the crystal oscillator Y1 respectively;

[0067] It should be noted that the resistor R2 and the crystal oscillator Y1 form a parallel circuit.

[0068] It should be noted that in Figure 4 and Figure 5 In the figure, the microcontroller U3 consists of two parts, U3A and U3B.

[0069] It should be noted that the I / O ports PB6 to PB15 (i.e., pins 58, 59, 61, 62, 29, 30, 33, 34, 35, and 36) and ports PC0 to PC9 (i.e., pins 8, 9, 10, 11, 24, 25, 37, 38, 39, and 40) of the single-chip computer U3 serve as contact state detection ports of the main relay KA;

[0070] In specific implementation, for the present invention, a plurality of detection ports within a preset range on the single-chip microcomputer U3 are respectively connected to a detection branch of a main relay KA;

[0071] The detection branch of each relay KA includes a resistor R6;

[0072] One end of the resistor R6 is respectively connected to one of the multiple detection ports in a preset range on the single chip microcomputer U3 and a normally closed contact 7 of a main relay KA;

[0073] The other end of the resistor R6 is connected to the first DC power supply terminal Vout1 (i.e., the power supply terminal 3V3, which is used to output and provide a 3.3V DC power supply);

[0074] The normally closed contact 8 of the main relay KA is connected to GND1 (grounded).

[0075] Further, the plurality of detection ports in a preset range on the single-chip computer U3 specifically include: pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40 and pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36 of the single-chip computer U3;

[0076] Further, see, for example, Figure 4 , Figure 5 As shown, regarding ports PB6 to PB15 (i.e., pins 58, 59, 61, 62, 29, 30, 33, 34, 35, and 36) and ports PC0 to PC9 (i.e., pins 8, 9, 10, 11, 24, 25, 37, 38, 39, and 40) of the single-chip computer U3, these ports are used as contact state detection ports of the main relay KA;

[0077] In the present invention, Figure 5 In the figure, only the electrical schematic diagram of the detection branch of the main relay KA connected to the 1-way port PC7 (i.e., pin 38 of U3) is shown (the detection branch diagrams of the contact state detection ports of the other main relays KA are omitted). The contact state detection ports of the other main relays KA are respectively connected to a detection branch of the main relay KA, and these detection branches are circuits of the same design. Each detection branch has a different main relay KA,

[0078] In specific implementation, for the detection circuit, the pin 7 of the single-chip computer U3 is connected to the first DC power supply terminal Vout1 (i.e., the power supply terminal 3V3, which is used to output and provide a 3.3V DC power supply) through the resistor R4;

[0079] Pin 60 of the microcontroller U3 is connected to GND1 (grounded) through resistor R3;

[0080] In specific implementation, for the detection circuit, pins 13, 19, 32, 48 and 64 of the single-chip computer U3 are respectively connected to the first DC power supply terminal Vout1 (i.e., the power supply terminal 3V3, which is used to output and provide a 3.3V DC power supply);

[0081] In specific implementation, for the detection circuit, pins 12, 18, 31, 47 and 63 of the microcontroller U3 are connected to GND1 (ground) respectively;

[0082] In specific implementation, for the detection circuit, pin 13 of the single-chip computer U3 is connected to one end of the filter capacitors C7 to C11 respectively;

[0083] The other end of the filter capacitors C7 to C11 is connected to GND1 (ground).

[0084] In terms of specific implementation, Figures 4 to 7 In the figure, 3V3 is the 3.3V DC power supply;

[0085] Capacitors C7, C8, C9, and C11 are all 0.1 μF magnetic dielectric capacitors; C10 is a 10 μF electrolytic capacitor; and C5 and C6 are 22 pF magnetic dielectric capacitors.

[0086] In specific implementation, resistors R2, R3, R4, and R6 are 10KΩ resistors;

[0087] In specific implementation, the frequency of crystal oscillator Y1 is 8MHz;

[0088] In the present invention, it should be noted that the single-chip microcomputer U3 is a microcontroller with mature prior art, and there are multiple models, for example, the STM32F103R8T6 chip produced by STMicroelectronics can be used.

[0089] It should be noted that, for the single-chip microcomputer U3, the VDD port (including pins 32, 48, 64, 19 and 13) is: the power supply terminal; the VSS port (including pins 21, 47, 63 and 12) is: the ground terminal; PC0~PC9 (i.e. pins 8, 9, 10, 11, 24, 25, 37, 38, 39, 40), PB6~PB15 (i.e. pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36) are input and output ports, which are configured as analog input ports through the program of the single-chip microcomputer U3. In the present invention, they are respectively used as contact state detection ports of multiple main relays KA;

[0090] For the single-chip microcomputer U3, PA0-PA12 (i.e., pins 14, 15, 16, 17, 20, 21, 22, 23, 41, 42, 43, 44, and 45), PA15 (i.e., pin 50), and PB0-PB5 (i.e., pins 26, 27, 28, 55, 56, and 57) are input and output ports, which are configured as analog output ports by the program of the single-chip microcomputer U3, specifically, as control signal output ports for outputting control signals to a plurality of sub-control circuits;

[0091] For the single-chip microcomputer U3, PD0 and PD1 (i.e., pins 5 and 6) are multiplexed ports, which are configured as operating frequency setting ports through the program provided by the single-chip microcomputer U3;

[0092] For the single-chip computer U3, NRST (i.e., pin 76) is the reset port; BOOT0 (i.e., pin 60) is the program running control port.

[0093] In specific implementation, for the single-chip microcomputer U3, multiple VDD ports (including pins 32, 48, 64, 19 and 13) on it are connected to the first DC power supply terminal Vout1 (i.e. DC 3.3V) to provide working power for the single-chip microcomputer U3. The VSS port (including pins 21, 47, 63 and 12) is connected to GND1 to provide a reference voltage for the single-chip microcomputer U3.

[0094] In specific implementation, PC0~PC9 and PB6~PB15 ports are connected to one end of resistor R6 and a normally closed contact 7 of a main relay KA. When the conventional power supply A is normal, the main relay KA coil is closed, the normally closed contacts 7 and 8 are disconnected, and this port is connected to the first DC power supply terminal Vout1 through resistor R6, which is a high level at this time; when the conventional power supply A is abnormal, the main relay KA coil is released, the normally closed contacts 7 and 8 are closed, and this port is connected to GND1, which is a low level at this time.

[0095] In specific implementation, PA0~PA12, PA15, and PB0~PB5 ports are connected to one end of the current limiting resistor R15. When the conventional power supply A is normal, PC0~PC9 and PB6~PB15 ports are high level, and PA0~PA12, PA15, and PB0~PB5 ports output high level; when the conventional power supply A is abnormal, PC0~PC9 and PB6~PB15 ports are low level, and PA0~PA12, PA15, and PB0~PB5 ports output low level.

[0096] In the present invention, see Figure 4 , Figure 6 As shown, the auxiliary power supply includes: a terminal J1, a fuse F1, a varistor RV, a resistor R1, a power module U1, a power conversion chip U2, and capacitors C1 to C4;

[0097] Terminal J1 is connected to emergency power supply B;

[0098] The first terminal on the terminal block J1 is connected to one end of the fuse F1;

[0099] The other end of the fuse F1 is connected to one end of the resistor R1 and one end of the varistor RV respectively;

[0100] The second terminal on the wiring terminal J1 is connected to the other end of the varistor RV and the second pin of the power module U1 respectively;

[0101] The other end of the resistor R1 is connected to the first pin of the power module U1;

[0102] The 4th pin of the power module U1 is respectively connected to the second DC power supply terminal Vout2 (i.e., the power supply terminal +12V, which is used to output and provide a 12V DC power supply), one end of the capacitor C1, one end of the capacitor C2, and the 3rd pin of the power conversion chip U2;

[0103] The third pin of the power module U1 is connected to the other end of the capacitor C1, the other end of the capacitor C2 and the first pin of the power conversion chip U2 respectively;

[0104] The third pin of the power module U1 is connected to GND1 (ground);

[0105] The second pin of the power conversion chip U2 is respectively connected to one end of the capacitor C3, one end of the capacitor C4 and the first DC power supply terminal Vout1 (i.e., the power supply terminal 3V3, which is used to output and provide a 3.3V DC power supply);

[0106] One end of the capacitor C3 and one end of the capacitor C4 are connected to GND1 (grounded).

[0107] In specific implementation, the first terminal and the second terminal on the wiring terminal J1 are connected to the live wire terminal L and the neutral wire terminal N of the emergency power supply B respectively;

[0108] It should be noted that the terminal J1 is used to connect the emergency power supply B.

[0109] It should be noted that the 4th pin of the power module U1 is a +24V output, and the 3rd pin of the power module U1 is a ground GND1 of a DC output.

[0110] It should be noted that, for the auxiliary power supply, capacitor C1 and capacitor C2 are connected in parallel; capacitor C3 and capacitor C4 are connected in parallel; the third pin of the power conversion chip U2 is connected to the second DC power supply terminal Vout2 (i.e., the power supply terminal +12V, which is used to output and provide 12V DC power supply), the first pin is connected to GND1, and the second pin is the first DC power supply terminal Vout1 (i.e., the power supply terminal 3V3, which is used to output and provide 3.3V DC power supply) to achieve 3V3 output.

[0111] In specific implementation, it should be noted that for the auxiliary power supply, the terminal J1 needs to be connected to the AC power supply (specifically the emergency power supply B), and a terminal with a spacing of not less than 3.5 mm should be selected. The present invention selects the terminal produced by Supu Company, model MC-PA5.08V02-000;

[0112] In specific implementation, fuse F1, as an overcurrent protection device, is a fast fuse with a fusing current of 2A;

[0113] In the specific implementation, the varistor RV is used as an overvoltage protection device, and the selected one is 14D561K;

[0114] In specific implementation, resistor R1 is used as a current limiting protection device, and a 33Ω / 3W metal oxide film resistor is selected;

[0115] In specific implementation, the power module U1 is used to convert the AC input provided by the emergency power supply B into a DC12V power supply. The input voltage range should meet (165V ~ 275V). The selected one is the LD03-23B12R2 AC-DC power supply module produced by Goldensun.

[0116] It should be noted that pin 1 (AC port) of the power module U1 is connected to the live wire terminal L of the AC input (specifically the live wire terminal L of the emergency power supply B) through the current limiting resistor R1 and the fuse F1; pin 2 (AC port) of the power module U1 is connected to the neutral wire terminal N of the AC input (specifically the neutral wire terminal N of the emergency power supply B), pin 4 (V+ port) of the power module U1 is connected to the positive terminal Vout2 of the DC output (that is, the second DC power supply terminal Vout2), and pin 3 (V- port) of the power module U1 is used to connect to the ground GND1 of the DC output.

[0117] In specific implementation, the power conversion chip U2 is used to convert the 12V power supply into a DC3.3V power supply with higher voltage regulation accuracy. Specifically, the power conversion chip U2 of the AMS1117-3.3V model produced by Mesonco can be selected;

[0118] It should be noted that pin 1 (GND port) of the power conversion chip U2 is used to connect to the ground GND1, pin 3 (Vin port) is used to connect to the DC input terminal Vout2 (i.e., the second DC power supply terminal Vout2), and pin 2 (Vout port) is connected to the DC output terminal Vout1 (i.e., the first DC power supply terminal).

[0119] In a specific implementation, capacitors C2 and C4 are filter capacitors, both of which are 0.1 μF magnetic dielectric capacitors; capacitors C1 and C3 are 10 μF electrolytic capacitors.

[0120] In the present invention, in a specific implementation, the control circuit includes a plurality of sub-control circuits;

[0121] A plurality of I / O ports (input and output ports) within a preset range on the single-chip microcomputer U3 are respectively connected to a sub-control circuit.

[0122] For specific implementation, see Figure 4 , Figure 7 As shown, each sub-control circuit includes: resistors R15-R18, transistor Q3, optical coupler TF2, transistor Q4 and diode D2;

[0123] It should be noted that see Figure 1 As shown, the control circuit of the present invention includes a plurality of sub-control circuits, and the plurality of sub-control circuits include a plurality of control relays KC (eg, 1KC to nKC).

[0124] A plurality of I / O ports (input and output ports) within a preset range on the microcontroller U3, specifically pins 14, 15, 16, 17, 20, 21, 22, 23, 41, 42, 43, 44, 45, pin 50 and pins 26, 27, 28, 55, 56 and 57 on the microcontroller U3;

[0125] Each of the multiple I / O ports within a preset range on the single-chip computer U3 is connected to one end of a resistor R15 in a control circuit;

[0126] The other end of the resistor R15 is connected to the base of the transistor Q3;

[0127] The emitter of the transistor Q3 is connected to the first DC power supply terminal Vout1 (i.e., the power supply terminal 3V3, which is used to output and provide a 3.3V DC power supply) in the auxiliary power supply;

[0128] The collector of the transistor Q3 is connected to the first pin of the optocoupler TF2;

[0129] The second pin of the optocoupler TF2 is connected to GND1 (ground) through the resistor R16;

[0130] The fourth pin of the optical coupler TF2 is connected to the second DC power supply terminal Vout2 (i.e., the power supply terminal +12V, which is used to output and provide a 12V DC power supply) in the auxiliary power supply;

[0131] The third pin of the optocoupler TF2 is connected to the base of the transistor Q4 through the resistor R17;

[0132] The emitter of transistor Q4 is connected to GND1 (ground);

[0133] The collector of the transistor Q4 is connected to the second DC power supply terminal Vout2 (i.e., the power supply terminal +12V, which is used to output and provide a 12V DC power supply) in the auxiliary power supply through the diode D2;

[0134] The two ends of the diode D2 are respectively connected to the two ends of the coil of the control relay KC in the main circuit;

[0135] It should be noted that the diode D2 is connected in parallel with the coil of the control relay KC.

[0136] In specific implementation, the third pin of the optocoupler TF2 is also connected to GND1 (ground) through the resistor R18;

[0137] It should be noted that the I / O ports (input and output ports) PA0-PA12 (i.e., pins 14, 15, 16, 17, 20, 21, 22, 23, 41, 42, 43, 44 and 45), PA15 (i.e., pin 50) and PB0-PB5 (i.e., pins 26, 27, 28, 55, 56 and 57) of the single-chip computer U3 are used as control signal output ports for outputting to the control circuit. In the present invention, Figure 7As shown, it is an electrical schematic diagram of a control circuit connected to one of the PB5 (pin 57 of the single-chip computer U3) as an example. The control circuits connected to these control signal output ports are control circuits of the same design.

[0138] In specific implementation, resistor R15 is a current limiting resistor with a resistance of 5.1KΩ;

[0139] Resistor R16 provides the primary current of the optocoupler, and its resistance value is 1.5KΩ;

[0140] Resistor R17 is a current limiting resistor with a resistance of 39KΩ;

[0141] Resistor R18 is a voltage divider resistor with a resistance of 100KΩ;

[0142] In specific implementation, transistor Q3 is a PNP transistor, model S8550;

[0143] Transistor Q4 is an NPN transistor, model S8050;

[0144] In terms of specific implementation, the optocoupler TF2 is an optocoupler of model TLP521GB-S produced by Youtai Semiconductor Co., Ltd.

[0145] It should be noted that pin 1 of the optocoupler TF2 is the positive electrode of the primary-side light-emitting diode, connected to the collector of the transistor Q3; pin 2 of the optocoupler TF2 is the negative electrode of the primary-side light-emitting diode, connected to GND1 through resistor R16; pin 3 of the optocoupler TF2 is the emitter of the secondary-side transistor, connected to the base of the transistor Q4 through resistor R17; pin 4 of the optocoupler TF2 is the collector of the secondary-side transistor, connected to the power supply Vout2 (i.e., the second DC power supply terminal Vout2). When pins 1 and 2 of the primary side of the optocoupler TF2 are turned on, the light-emitting diode generates photoelectrons, turns on the transistor on the secondary side, and pins 3 and 4 of the secondary side (i.e., the emitter and collector of the secondary-side transistor) are turned on.

[0146] In specific implementation, diode D2 is a protective device for the coil of control relay KC, and its model is 1N4001;

[0147] In specific implementation, the control relay KC needs to meet the coil voltage of 12V, and the model is HF116-2.

[0148] In specific implementation, the action time of the control relay KC in the control circuit can be preset (for example, by setting it through software supporting the control relay KC).

[0149] In the present invention, the control relay KC is a mature electrical component in the prior art. The specific model can be the Hongfa HF116-2 relay produced by Xiamen Hongfa Electroacoustics Co., Ltd. The electrical circuit diagram of the control relay KC is as follows: Figure 2 As shown. The coil contact identification of the control contactor KC is 0 and 1; the two sets of normally open contacts are (2, 4) and (6, 8);

[0150] It should be noted that when the coil contacts 0 and 1 of the control relay KC are powered (220V), the two sets of normally open contacts (2, 4) and (6, 8) change from open to closed.

[0151] In specific implementation, the rated current of the main contact of Hongfa HF116-2 relay is 30A. The specific power can be selected according to the specific circuit. The control relay KC is not limited to the model specifications in the present invention. As long as it meets Figure 1 Any existing relay having the function and structure of the control relay KC can be adopted.

[0152] In the present invention, the control relay KC has two sets of contacts, which are (2, 4) and (6, 8). Figure 1 As shown, the inputs L and N (i.e., the live wire input terminal L and the neutral wire input terminal N) of the AC load F and the live wire terminal L and the neutral wire terminal N of the emergency power supply B are connected respectively.

[0153] In the present invention, in specific implementation, the contact flow of the main relay KA should meet the requirement of the maximum load current of the power supply panel, which is not less than 20A, and NDC2J-32 / 31 / 2P is selected.

[0154] In the present invention, in a specific implementation, the main relay KA is an electrical component with mature prior art, and the specific model can be the Liangxin NDC2J-32 / 31 / 2P relay produced by Shanghai Liangxin Electric Co., Ltd. The electrical circuit diagram of the main relay KA is as follows: Figure 3 As shown. The coil contacts of the main relay KA are marked with A1 and A2; three groups of normally open contacts are (R1, R2), (3, 4) and (5, 6); and one group of normally closed contacts is (7, 8).

[0155] It should be noted that when the coil contacts A1 and A2 of the main relay KA are energized (220V), three groups of normally open contacts (R1, R2), (3, 4) and (5, 6) change from open to closed; and one group of normally closed contacts (7, 8) changes from closed to open.

[0156] In specific implementation, the rated current of the main contact of the Liangxin NDC2J-32 / 31 / 2P relay is 32A. The specific power can be selected according to the specific circuit. The main relay KA is not limited to the model specifications in the present invention. As long as it meets Figure 1 Any existing relay having the function and structure of the above-mentioned relay KA may be adopted.

[0157] In the present invention, two sets of contacts on the main relay KA are used. The two sets of contacts (contact points) are specifically (3, 4) and (5, 6). Figure 1 As shown, the inputs L and N (i.e., the live wire input terminal L and the neutral wire input terminal N) of the AC load F and the live wire terminal L and the neutral wire terminal N of the conventional power supply B are connected respectively.

[0158] Based on the multi-channel output switching circuit provided by the present invention, the present invention further provides a railway signal power supply panel, which includes the multi-channel output switching circuit as described above;

[0159] In a specific implementation, the multi-channel output switching circuit includes a multi-channel AC output terminal;

[0160] Multiple AC loads F (i.e., AC electrical equipment) are connected to the multiple AC output terminals.

[0161] In order to more clearly understand the technical solution of the present invention, the working principle of the present invention is explained below.

[0162] 1. When the railway signal power supply panel system works normally, the conventional power supply A supplies power to multiple AC loads F through the normally open contacts of the main relay KA (specifically the 4th and 6th contacts), and at the same time, the coil of the main relay KA is energized and closed, and the auxiliary normally closed contacts of the main relay KA (i.e. the 7th and 8th contacts) are disconnected;

[0163] At this time, any contact state detection port of the main relay KA, that is, any one of the I / O ports PB6~PB15 (i.e., pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36) and ports PC0~PC9 (i.e., pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40) of the single-chip computer U3 (for example, PC7 port, i.e., pin 38), since these contact state detection ports are connected to the 7th contact (normally closed contact) of the main relay KA and the first DC power supply terminal Vout1 of 3.3V, each contact state detection port is connected to the 7th contact (normally closed contact) of the main relay KA and the first DC power supply terminal Vout1 of 3.3V, so that ... When the detection port (e.g., pin 38) is at a high level (e.g., a 3.3V level greater than 0), and the control program of the microcontroller U3 detects the high level, a control signal output port (e.g., pin 56 corresponding to pin 38) on the microcontroller U3 corresponding to the contact status detection port outputs a high level to the connected sub-control circuit, thereby turning off the transistor Q3 in the sub-control circuit, turning off the optocoupler TF2, and turning off the transistor Q4. The coil of the control relay KC is not energized, and the normally open contacts of the control relay KC (specifically, the 8th contact and the 4th contact) will not connect to the emergency power supply B, and the emergency power supply B will have no output.

[0164] 2. When any AC output (i.e., the power supply of any AC load F) is abnormal (i.e., the power supply is abnormal and stops supplying power to an AC load F), the coil of the main relay KA corresponding to the abnormal AC output circuit loses power and releases, and the normally closed contacts of the main relay KA (i.e., the 7th and 8th contacts) are closed;

[0165] At this time, a contact status detection port corresponding to the main relay KA on each abnormal AC output circuit, that is, one of the I / O ports PB6~PB15 (i.e., pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36) and ports PC0~PC9 (i.e., pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40) of the single-chip computer U3 (for example, PC7 port, i.e., pin 38), is connected to the 7th contact (normally closed contact) of the main relay KA, and as mentioned above, since the 7th and 8th contacts of the main relay KA are closed, the contact status detection port corresponding to the main relay KA on the abnormal AC output circuit is closed. When the contact state detection port (e.g., pin 38) is at a low level (i.e., grounded, with a voltage of 0), the control program of the single-chip microcomputer U3 detects the low level and sets a control signal output port (e.g., pin 56 corresponding to pin 38) on the single-chip microcomputer U3 corresponding to the contact state detection port to a low level, i.e., outputs a low level to the connected sub-control circuit, thereby turning on the transistor Q3, the optocoupler TF2, and the transistor Q4 in the sub-control circuit, energizing the coil of the control relay KC, and connecting the normally open contact of the control relay KC to the emergency power supply B (specifically, controlling the 8th contact to close and connect with the 6th contact, and the 4th contact to close and connect with the 2nd contact), thereby, the output of the emergency power supply B continues to supply power to the AC load F.

[0166] Compared with the prior art, the multi-channel output switching circuit provided by the present invention has the following beneficial effects:

[0167] 1. The circuit of the present invention is a circuit with reasonable structure, strong practicability, simple operation and high reliability, which can realize automatic switching of multiple outputs of railway signal power supply panel;

[0168] 2. The circuit color preservative of the present invention effectively meets the functional requirement of automatically switching to emergency power supply after a failure of a multi-channel AC output circuit of a railway signal power supply panel.

[0169] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-channel output switching circuit, characterized in that: include: Multi-channel output switching device and main circuit; The main circuit includes: a plurality of main relays KA and a plurality of control relays KC; The two ends of the coil of each main relay KA are connected to the live wire terminal L and the neutral wire terminal N of the conventional power supply A respectively; The third and fifth contacts of each main relay KA are connected to the live terminal L and the neutral terminal N of the conventional power supply A respectively; The 4th and 6th contacts of each main relay KA are respectively connected to the live input terminal L and the neutral input terminal N of an AC load F; The seventh contact of each main relay KA is connected to the detection circuit in the multi-channel output switching device; The 8th contact of each main relay KA is connected to GND1; The 8th and 4th contacts of each control relay KC are connected to the live terminal L and the neutral terminal N of the emergency power supply B respectively; The sixth contact and the second contact of each control relay KC are respectively connected to the live input terminal L and the neutral input terminal N of an AC load F; Both ends of the coil of each control relay KC are connected to the control circuit in the multi-channel output switching device; Among them, the multi-channel output switching device includes: a detection circuit, an auxiliary power supply and a control circuit; A detection circuit is connected to the auxiliary power supply and the control circuit respectively; Auxiliary power supply, connected to the control circuit; The detection circuit is used to determine the power supply status of the main circuit and output a control signal to the control circuit when a power failure occurs in the power supply to any AC load F in the main circuit; Auxiliary power supply, used to provide working power to the detection circuit and control circuit; The control circuit is used to control the emergency power supply B to ensure the power supply to the AC load F according to the control signal output by the detection circuit.

2. The multi-channel output switching circuit according to claim 1, characterized in that: The detection circuit is specifically used to detect the state of each main relay KA in the main circuit, and output a control signal to the control circuit when the coils of one or more main relays KA lose power and release.

3. The multi-channel output switching circuit according to claim 1, characterized in that: The detection circuit includes a single chip microcomputer U3, resistors R2 to R4, resistor R6, capacitors C5 to C11 and a crystal oscillator Y1; Resistor R2 and crystal oscillator Y1 are connected in parallel and connected to pins 5 and 6 of U3; Pin 5 of microcontroller U3 is connected to GND1 through capacitor C5; Pin 6 of microcontroller U3 is connected to GND1 through capacitor C6; Pin 5 and pin 6 of the single chip microcomputer U3 are also connected to the two ends of the resistor R2 and the two ends of the crystal oscillator Y1 respectively.

4. The multi-channel output switching circuit according to claim 3, characterized in that: Multiple detection ports of a preset range on the single chip microcomputer U3 are respectively connected to a detection branch of a main relay KA; The detection branch of each relay KA includes a resistor R6; One end of the resistor R6 is respectively connected to one of the ports in a preset range on the single chip microcomputer U3 and a normally closed contact 7 of a main relay KA; The other end of the resistor R6 is connected to the first DC power supply terminal Vout1; The normally closed contact 8 of the main relay KA is connected to GND1.

5. The multi-channel output switching circuit according to claim 4, characterized in that: The multiple detection ports in a preset range on the microcontroller U3 specifically include: pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40 and pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36 of the microcontroller U3.

6. The multi-channel output switching circuit according to claim 3, characterized in that: For the detection circuit, the pin 7 of the single chip computer U3 is connected to the first DC power supply terminal Vout1 through the resistor R4; Pin 60 of the microcontroller U3 is connected to GND1 through resistor R3; and / or, For the detection circuit, pins 13, 19, 32, 48 and 64 of the single-chip computer U3 are respectively connected to the first DC power supply terminal Vout1; and / or, For the detection circuit, pins 12, 18, 31, 47, and 63 of the microcontroller U3 are connected to GND1 respectively; and / or, For the detection circuit, pin 13 of the single-chip computer U3 is connected to one end of the filter capacitors C7 to C11 respectively; The other end of the filter capacitors C7 to C11 is connected to GND1.

7. The multi-channel output switching circuit according to claim 1, characterized in that: Auxiliary power supply, including: terminal J1, fuse F1, varistor RV, resistor R1, power module U1, power conversion chip U2 and capacitors C1 to C4; The first terminal on the terminal block J1 is connected to one end of the fuse F1; The other end of the fuse F1 is connected to one end of the resistor R1 and one end of the varistor RV respectively; The second terminal on the wiring terminal J1 is connected to the other end of the varistor RV and the second pin of the power module U1 respectively; The other end of the resistor R1 is connected to the first pin of the power module U1; The fourth pin of the power module U1 is respectively connected to the second DC power supply terminal Vout2, one end of the capacitor C1, one end of the capacitor C2 and the third pin of the power conversion chip U2; The third pin of the power module U1 is connected to the other end of the capacitor C1, the other end of the capacitor C2 and the first pin of the power conversion chip U2 respectively; The third pin of the power module U1 is connected to GND1; The second pin of the power conversion chip U2 is respectively connected to one end of the capacitor C3, one end of the capacitor C4 and the first DC power supply terminal Vout1; One end of capacitor C3 and one end of capacitor C4 are connected to GND1; The first terminal and the second terminal on the wiring terminal J1 are connected to the live wire terminal L and the neutral wire terminal N of the emergency power supply B respectively.

8. The multi-channel output switching circuit according to claim 1, characterized in that: A control circuit, comprising a plurality of sub-control circuits; Multiple I / O ports within a preset range on the single-chip microcomputer U3 are connected to a sub-control circuit respectively; Each sub-control circuit includes: resistors R15-R18, transistor Q3, optical coupler TF2, transistor Q4 and diode D2; Each of the multiple I / O ports in a preset range on the single-chip computer U3 is connected to one end of a resistor R15 in a control circuit; The other end of the resistor R15 is connected to the base of the transistor Q3; The emitter of the transistor Q3 is connected to the first DC power supply terminal Vout1 in the auxiliary power supply; The collector of the transistor Q3 is connected to the first pin of the optocoupler TF2; The second pin of the optocoupler TF2 is connected to GND1 through the resistor R16; The fourth pin of the optical coupler TF2 is connected to the second DC power supply terminal Vout2 in the auxiliary power supply; The third pin of the optocoupler TF2 is connected to the base of the transistor Q4 through the resistor R17; The emitter of transistor Q4 is connected to GND1; The collector of the transistor Q4 is connected to the second DC power supply terminal Vout2 in the auxiliary power supply through the diode D2; The two ends of the diode D2 are respectively connected to the two ends of the coil of the control relay KC in the main circuit.

9. The multi-channel output switching circuit according to claim 8, characterized in that: A plurality of I / O ports within a preset range on the microcontroller U3, specifically pins 14, 15, 16, 17, 20, 21, 22, 23, 41, 42, 43, 44, 45, pin 50 and pins 26, 27, 28, 55, 56 and 57 on the microcontroller U3; and / or, The third pin of the optocoupler TF2 is also connected to GND1 through the resistor R18.

10. A railway signal power supply panel, characterized in that: The invention comprises the multi-channel output switching circuit as claimed in any one of claims 1 to 9.

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