Multipath output switching circuit and railway signal power supply screen

Abstract

The utility model discloses a multipath output switching circuit and a railway signal power supply screen. The multipath output switching circuit comprises a multipath 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 utility model, when one or more AC power supply outputs (i.e., the power supply of the AC load) of the railway signal power supply screen break down and are powered off, the emergency power supply continuously supplies power to the AC load, so that the normal operation of the AC load is ensured, and the railway signal power supply screen has great practical significance.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit technical field, concretely relates to railway signal power supply screen technical field, especially relates to a kind of multi-output switching circuit and railway signal power supply screen. BACKGROUND

[0002] Railway signal power supply screen is applied in railway industry, for the power supply system for the power supply of station signal equipment.Railway signal power supply screen, not only provides DC power supply for relay, coding device, inter-station contact, DC switch machine and other equipment, but also needs to provide AC power supply for turnout indication, signal machine, interlocking device, centralized monitoring and other equipment.

[0003] Among them, the stability and reliability of system can be improved by setting parallel module for DC power supply, and the reliability of railway signal power supply screen system is usually improved by setting emergency power supply for AC power supply, however, due to the large number of AC power supply output, more emergency power supply is needed, not only the overall power consumption of railway signal power supply screen system is improved, but also the overall construction cost of railway signal power supply screen system is increased.

[0004] Therefore, it is urgent to develop a kind of technology, which can solve the above technical problems. UTILITY MODEL CONTENT

[0005] The utility model aims at the technical defects existing in prior art, provide a kind of multi-output switching circuit and railway signal power supply screen.

[0006] Therefore, the utility model provides a kind of multi-output switching circuit, it includes: multi-output switching device and main circuit;

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

[0008] The coil of each main relay KA two ends is connected with the fire line end L and zero line end N of conventional power supply A respectively;

[0009] The 3rd contact and the 5th contact of each main relay KA are connected with the fire line end L and zero line end N of conventional power supply A respectively;

[0010] The 4th contact and the 6th contact of each main relay KA are connected with the fire line input end L and zero line input end N of an AC load F respectively;

[0011] The 7th contact of each main relay KA is connected with the detection circuit in multi-output switching device;

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

[0013] The 8th contact and the 4th contact of each control relay KC are connected with the live wire end L and the zero wire end N of the emergency power supply B respectively;

[0014] The 6th contact and the 2nd contact of each control relay KC are connected with the live wire input end L and the zero wire input end N of an AC load F respectively;

[0015] The coil of each control relay KC is connected with the control circuit in the multi-output switching device;

[0016] The multi-output switching device comprises a detection circuit, an auxiliary power supply and a control circuit.

[0017] The detection circuit is connected with the auxiliary power supply and the control circuit respectively;

[0018] The auxiliary power supply is connected with the control circuit;

[0019] The detection circuit is used for judging the power supply state of the main circuit and outputting a control signal to the control circuit when the power supply of any AC load F in the main circuit appears a power failure;

[0020] The auxiliary power supply is used for providing working power for the detection circuit and the control circuit;

[0021] The control circuit is used for controlling the connection of the emergency power supply B according to the control signal outputted by the detection circuit, so as to guarantee the power supply of the AC load F.

[0022] In addition, the utility model also provides a railway signal power supply screen, it includes the multi-output switching circuit as mentioned in preceding.

[0023] From the above technical scheme provided by the utility model can see, compared with the prior art, the utility model provides a multi-output switching circuit and railway signal power supply screen, scientific design, the utility model provides a structure is reasonable, the practicality is strong, reliability is high, can realize railway signal power supply screen multi-output automatic switching circuit, can make the railway signal power supply screen with the multi-output switching circuit in one way or multi-way AC power output (that is the power supply of one or more AC loads) appears the power failure and occurs the power failure problem, automatic switching continues to supply power for the AC load by the emergency power supply (specifically has the emergency power supply standby circuit), guarantees the normal operation of the AC load, has the great practical significance.

[0024] By applying the utility model, the state of the output power (that is the power supply of the AC load F) can be automatically detected, and the emergency power supply can be automatically switched when a fault occurs. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1It is the overall working principle schematic view of the multi-output switching circuit, namely the electrical connection view of the multi-output switching device and the main circuit.

[0026] Figure 2 It is the electrical principle view of the control relay in the multi-output switching circuit.

[0027] Figure 3 It is the electrical principle view of the main relay in the multi-output switching circuit.

[0028] Figure 4 It is the electrical principle view of the multi-output switching device in the multi-output switching circuit.

[0029] Figure 5 It is the principle view of the detection circuit included in the multi-output switching device in the multi-output switching circuit.

[0030] Figure 6 It is the principle view of the auxiliary power supply included in the multi-output switching device in the multi-output switching circuit.

[0031] Figure 7 It is the principle view of the control circuit included in the multi-output switching device in the multi-output switching circuit.

[0032] KA-main relay (namely main circuit relay); KC-control relay in the drawing.

[0033] J1-terminal; F1-fuse; RV-voltage-dependent resistor; R1-resistor; U1-power module; U2-power conversion chip; C1-capacitor; C2-capacitor; C3-capacitor; C4-capacitor; U3-single-chip microcomputer.

[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-triode; Q4-triode; TF2-optocoupler; D2-diode. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0037] In the description of the present patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "setting" should be understood in a broad sense, for example, can be fixedly connected, set, or can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meanings of the above terms in the present patent can be understood according to the specific circumstances.

[0038] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0039] Referring to Figures 1 to 7 The present application provides a kind of multi-output switching circuit, comprising:

[0040] Multi-output switching device and main circuit;

[0041] Wherein, main circuit, comprising: multiple main relays KA (for example 1KA ~ nKA), and multiple control relays KC (for example 1KC ~ nKC);

[0042] The coil of each main relay KA is connected with the live end L and the neutral end N of the conventional power supply A respectively;

[0043] The 3rd contact (is normally open contact) and the 5th contact (is normally open contact) of each main relay KA (i.e. main circuit relay) are connected with the live end L and the neutral end N of the conventional power supply A respectively;

[0044] The 4th contact (is normally open contact) and the 6th contact (is normally open contact) of each main relay KA are connected with the live input end L and the neutral input end N of an alternating current load F (i.e. alternating current electrical equipment) respectively;

[0045] It should be noted that the multiple main relays KA (for example 1KA ~ nKA) in the main circuit are connected with multiple alternating current loads F (for example F1 ~ Fn) respectively.

[0046] The 7th contact (a normally closed contact) of each main relay KA is connected with a detection circuit in the multiplex output switching device;

[0047] The 8th contact (a normally closed contact) of each main relay KA is connected with GND1 (i.e. ground);

[0048] The 8th contact (a normally open contact) and the 4th contact (a normally open contact) of each control relay KC are connected with the live wire end L and the zero wire end N of the emergency power supply B respectively;

[0049] The 6th contact (a normally open contact) and the 2nd contact (a normally open contact) of each control relay KC are connected with the live wire input end L and the zero wire input end N of an alternating current load F (i.e. an alternating current electrical equipment) respectively;

[0050] The coil of each control relay KC is connected with a control circuit in the multiplex output switching device;

[0051] The multiplex output switching device comprises a detection circuit, an auxiliary power supply and a control circuit;

[0052] The detection circuit is connected with the auxiliary power supply and the control circuit respectively;

[0053] The auxiliary power supply is connected with the control circuit;

[0054] The detection circuit is used for judging the power supply state of the main circuit and outputting a control signal to the control circuit when the power supply of any one of the alternating current loads F in the main circuit appears a power failure;

[0055] It is to be noted that the detection circuit is specifically used for detecting the state of each main relay KA in the main circuit and outputting a control signal to the control circuit when the coil of one or more main relays KA is released (i.e. disconnected with the alternating current load F) due to the power supply failure of one or more alternating current loads F;

[0056] The auxiliary power supply is used for providing working power for the detection circuit and the control circuit;

[0057] The control circuit is used for controlling (specifically by controlling the control relay KC in the main circuit) the connection of the emergency power supply B according to the control signal output by the detection circuit, so as to guarantee the continuous power supply to the alternating current load F.

[0058] In the utility model, it is to be noted that the detection circuit comprises a single-chip microcomputer minimum system composed of a single-chip microcomputer, a resistor, a crystal oscillator and the like. The auxiliary power supply comprises a power module and a power conversion chip. The control circuit is a driving circuit of the control relay KC.

[0059] It should be noted that in this utility model, the detection circuit in the multi-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 is de-energized and released (i.e., disconnected from the AC load F, i.e. disconnected due to a fault in the power supply of AC load F, for example, a fault in conventional power supply A), the emergency power supply B is automatically connected through the control circuit. Furthermore, the multi-output switching device can be set with a delay time to avoid the situation where the relays of conventional power supply and emergency power supply B (i.e., main relay KA and control relay KC) compete for activation when powered on simultaneously.

[0060] In this invention, the multi-output switching device is used to determine the power supply status of the main circuit through its detection circuit, and when a power outage occurs in the main circuit to any AC load F, it controls the control relay KC in the main circuit to connect the emergency power supply B through its control circuit to ensure continuous power supply to the AC load F.

[0061] In this utility model, specifically, conventional power supply A is the power supply provided by the original AC bus on the railway signal power supply panel when the panel is working normally. It is usually a voltage value between AC 176V and AC 253V, for example, AC 220V, specifically AC mains power 220V.

[0062] In this invention, specifically, the emergency power supply B is an uninterruptible power supply (UPS), which can be the power output from the existing UPS in the railway signal power supply panel. The output voltage of the emergency power supply B is typically a voltage value between AC 213.4V and AC 226.6V, for example, AC 220V. There are several mature UPS models available, such as the FR-UK3340 UPS manufactured by Xiamen Kehua Co., Ltd., which is a three-phase input, three-phase output UPS with a rated power of 40KVA. When the external power grid fails, the UPS will discharge through its internal battery to maintain uninterrupted power output.

[0063] In this utility model, see Figure 4 , Figure 5 The detection circuit includes a microcontroller U3, resistors R2 to R4, resistor R6, capacitors C5 to C11, and crystal oscillator Y1.

[0064] Resistor R2 and crystal oscillator Y1 are connected in parallel and then connected to pins 5 and 6 of U3;

[0065] Pin 5 of microcontroller U3 is connected to GND1 (ground) through capacitor C5;

[0066] Pin 6 of microcontroller U3 is connected to GND1 (ground) through capacitor C6;

[0067] The pin 5 and the pin 6 of the single-chip microcomputer U3 are connected to both ends of the resistor R2 and both ends of the crystal oscillator Y1 respectively;

[0068] It should be noted that the resistor R2 and the crystal oscillator Y1 form a parallel circuit.

[0069] It should be noted that, in Figure 4 and Figure 5 , the single-chip microcomputer U3 includes two parts of U3A and U3B.

[0070] It should be noted that the I / O ports PB6-PB15 (i.e. the pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36) and the ports PC0-PC9 (i.e. the pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40) of the single-chip microcomputer U3 serve as the contact state detection ports of the main relay KA;

[0071] Specifically, for the utility model, the multiple detection ports of the preset range on the single-chip microcomputer U3 are connected to the detection branch of one main relay KA respectively;

[0072] The detection branch of each relay KA includes the resistor R6;

[0073] One end of the resistor R6 is connected to one port of the multiple detection ports of the preset range on the single-chip microcomputer U3 and the normally closed contact 7 of one main relay KA respectively;

[0074] The other end of the resistor R6 is connected to the first DC power supply end Vout1 (i.e. the power supply end 3V3, which is used for outputting and providing 3.3V DC power supply);

[0075] The normally closed contact 8 of the main relay KA is connected to GND1 (grounded).

[0076] Further, the multiple detection ports of the preset range on the single-chip microcomputer U3 specifically include the pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40 and the pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36 of the single-chip microcomputer U3;

[0077] Further, for example, as shown in Figure 4 , Figure 5 , as to the ports PB6-PB15 (i.e. the pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36) and the ports PC0-PC9 (i.e. the pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40) of the single-chip microcomputer U3, these ports serve as the contact state detection ports of the main relay KA;

[0078] In the utility model, in Figure 5 In the middle, only shows the detection branch of one main relay KA connected by one of the 1-way ports PC7 (i.e. the pin 38 of U3) (the detection branch diagram of the contact state detection port of other main relays KA is omitted). The contact state detection port of other main relays KA is connected with the detection branch of one main relay KA respectively, and these detection branches are the same designed circuit. Each detection branch has one different main relay KA,

[0079] Specifically, for the detection circuit, the pin 7 of the single-chip microcomputer U3 is connected with the first DC power supply end Vout1 (i.e. the power supply end 3V3, which is used for outputting and providing 3.3V DC power supply) through the resistor R4.

[0080] The pin 60 of the single-chip microcomputer U3 is connected with GND1 (ground) through the resistor R3.

[0081] Specifically, for the detection circuit, the pins 13, 19, 32, 48 and 64 of the single-chip microcomputer U3 are connected with the first DC power supply end Vout1 (i.e. the power supply end 3V3, which is used for outputting and providing 3.3V DC power supply) respectively.

[0082] Specifically, for the detection circuit, the pins 12, 18, 31, 47 and 63 of the single-chip microcomputer U3 are connected with GND1 (ground) respectively.

[0083] Specifically, for the detection circuit, the pin 13 of the single-chip microcomputer U3 is connected with one end of the filter capacitors C7-C11 respectively.

[0084] The other end of the filter capacitors C7-C11 is connected with GND1 (ground).

[0085] Specifically, Figures 4 to 7 In the middle, 3V3 is 3.3V DC power supply.

[0086] The capacitors C7, C8, C9 and C11 are 0.1uF magnetic medium capacitors; C10 is a 10uF electrolytic capacitor; C5 and C6 are 22pF magnetic medium capacitors.

[0087] Specifically, the resistors R2, R3, R4 and R6 are 10KΩ resistors.

[0088] Specifically, the frequency of the crystal oscillator Y1 is 8MHz.

[0089] In the utility model, it needs to be explained that the single-chip microcomputer U3 is a mature microcontroller in the prior art, and there are various models, for example, the STM32F103R8T6 chip produced by the STMicroelectronics Company can be adopted.

[0090] It should be noted that for the single-chip microcomputer U3, the VDD port (including pins 32, 48, 64, 19 and 13) is: a power supply end; the VSS port (including pins 21, 47, 63 and 12) is: a ground end; PC0-PC9 (i.e. pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 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 by the program of the single-chip microcomputer U3, and in the utility model, are respectively used as the contact state detection ports of the plurality of main relays KA;

[0091] 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, and are respectively used as the control signal output ports for outputting control signals to the plurality of sub-control circuits;

[0092] For the single-chip microcomputer U3, PD0 and PD1 (i.e. pins 5 and 6) are multiplexed ports, which are configured as working frequency setting ports by the program of the single-chip microcomputer U3;

[0093] For the single-chip microcomputer U3, NRST (i.e. pin 76) is a reset port; and BOOT0 (i.e. pin 60) is a program running control port.

[0094] In specific implementation, for the single-chip microcomputer U3, the plurality of VDD ports (including pins 32, 48, 64, 19 and 13) thereon are connected with a first direct current power supply end Vout1 (i.e. direct current 3.3V), for providing working power supply for the single-chip microcomputer U3. The VSS port (including pins 21, 47, 63 and 12) is connected with GND1, for providing reference voltage for the working of the single-chip microcomputer U3.

[0095] In specific implementation, the PC0-PC9 and PB6-PB15 ports are connected with one end of the resistor R6 and the normally closed contact 7 of one main relay KA, when the normal power supply A is normal, the main relay KA coil is closed, the normally closed contacts 7 and 8 are disconnected, this port is connected to the first direct current power supply end Vout1 through the resistor R6, at this time, it is high level; when the normal power supply A is abnormal, the main relay KA coil is released, the normally closed contacts 7 and 8 are closed, this port is connected to GND1, at this time, it is low level.

[0096] In a specific implementation, the PA0~PA12, PA15, PB0~PB5 ports are connected to one end of the current limiting resistor R15, when the normal power supply A is normal, the PC0~PC9, PB6~PB15 ports are high level, and the PA0~PA12, PA15, PB0~PB5 ports output high level; when the normal power supply A is abnormal, the PC0~PC9, PB6~PB15 ports are low level, and the PA0~PA12, PA15, PB0~PB5 ports output low level.

[0097] In the utility model, refer to Figure 4 、 Figure 6 Auxiliary power supply, including: terminal J1, fuse F1, voltage-dependent resistor RV, resistance R1, power module U1, power conversion chip U2 and capacitor C1~capacitor C4;

[0098] Terminal J1 is connected with emergency power supply B;

[0099] The first terminal on the terminal J1 is connected with one end of the fuse F1;

[0100] The other end of the fuse F1 is connected with one end of the resistance R1 and one end of the voltage-dependent resistor RV respectively;

[0101] The second terminal on the terminal J1 is connected with the other end of the voltage-dependent resistor RV and the second pin of the power module U1 respectively;

[0102] The other end of the resistance R1 is connected with the first pin of the power module U1;

[0103] The fourth pin of the power module U1 is connected with the second DC power terminal Vout2 (namely power terminal +12V, this port is used for outputting, providing 12V DC power supply), one end of the capacitor C1, one end of the capacitor C2 and the third pin of the power conversion chip U2 respectively;

[0104] The third pin of the power module U1 is connected with 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;

[0105] The third pin of the power module U1 is connected with GND1 (ground);

[0106] The second pin of the power conversion chip U2 is connected with one end of the capacitor C3, one end of the capacitor C4 and the first DC power terminal Vout1 (namely power terminal 3V3, this port is used for outputting, providing 3.3V DC power supply) respectively;

[0107] One end of the capacitor C3 and one end of the capacitor C4 are connected with GND1 (ground).

[0108] Specific implementation, the first terminal and the second terminal on the terminal J1 are connected with the firewire end L and the zero line end N of the emergency power supply B respectively.

[0109] It should be noted that the terminal J1 is used for connecting the emergency power supply B.

[0110] It should be noted that the fourth pin of the power module U1 is +24V output, and the third pin of the power module U1 is DC output ground GND1.

[0111] It should be noted that for the auxiliary power supply, the capacitor C1 and the capacitor C2 are connected in parallel; the capacitor C3 and the capacitor C4 are connected in parallel; the third pin of the power conversion chip U2 is connected with the second DC power supply end Vout2 (i.e. the power supply end +12V, which is used for outputting and providing 12V DC power supply), the first pin is connected with GND1, and the second pin is the first DC power supply end Vout1 (i.e. the power supply end 3V3, which is used for outputting and providing 3.3V DC power supply), realizing 3V3 output.

[0112] Specific implementation, it should be noted that for the auxiliary power supply, the terminal J1 needs to be connected with the AC power supply (specifically the emergency power supply B), and a terminal with a distance not less than 3.5mm should be selected, and the terminal with the model of MC-PA5.08V02-000 produced by the company Speedpo is selected in the utility model;

[0113] Specific implementation, the fuse F1 is selected as an overcurrent protection device, and is a fast fuse with a fuse current of 2A;

[0114] Specific implementation, the voltage-dependent resistor RV is selected as an overvoltage protection device, and is 14D561K;

[0115] Specific implementation, the resistor R1 is selected as a current limiting protection device, and is a 33Ω / 3W metal oxide resistor;

[0116] Specific implementation, the power module U1 is used for converting the AC input provided by the emergency power supply B into DC12V power supply, and the input voltage range should meet (165V-275V), and the AC-DC power module with the model of LD03-23B12R2 produced by the company Jinshengyang is selected;

[0117] It needs to be explained that the pin 1 (AC port) of the power module U1 is connected with the live wire end L of the AC input (specifically the live wire end L of the emergency power supply B) through the current limiting resistor R1 and the fuse F1, the pin 2 (AC port) of the power module U1 is connected with the zero line end N of the AC input (specifically the zero line end N of the emergency power supply B), the pin 4 (V+ port) of the power module U1 is connected with the positive end Vout2 (namely the second DC power supply end Vout2) of the DC output, and the pin 3 (V- port) of the power module U1 is used for connecting the ground GND1.

[0118] In specific implementation, the power conversion chip U2 is used for converting the 12V power supply into the DC 3.3V power supply with higher voltage stabilization precision, and specifically, the power conversion chip U2 of the model AMS1117-3.3V produced by the company Mouser can be selected.

[0119] It needs to be explained that the pin 1 (GND port) of the power conversion chip U2 is used for connecting the ground GND1, the pin 3 (Vin port) is used for connecting the DC input end Vout2 (namely the second DC power supply end Vout2), and the pin 2 (Vout port) is connected with the DC output end Vout1 (namely the first DC power supply end).

[0120] In specific implementation, the capacitors C2 and C4 are filter capacitors, and are both 0.1 mu F magnetic medium capacitors; the capacitors C1 and C3 are 10 mu F electrolytic capacitors.

[0121] In the utility model, in specific implementation, the control circuit comprises a plurality of sub control circuits.

[0122] The plurality of I / O ports (input and output ports) of the preset range on the single-chip microcomputer U3 are all connected with a sub control circuit respectively.

[0123] In specific implementation, as shown in Figure 4 , Figure 7 Each sub control circuit comprises resistors R15-R18, a triode Q3, an optical coupler TF2, a triode Q4 and a diode D2.

[0124] It needs to be explained that, as shown in Figure 1 The control circuit of the utility model comprises a plurality of sub control circuits, and the plurality of sub control circuits comprise a plurality of control relays KC (for example, 1KC-nKC) in total.

[0125] The plurality of I / O ports (input and output ports) of the preset range on the single-chip microcomputer U3 are specifically the pins 14, 15, 16, 17, 20, 21, 22, 23, 41, 42, 43, 44, 45, the pin 50 and the pins 26, 27, 28, 55, 56 and 57 on the single-chip microcomputer U3.

[0126] Each of the multiple I / O ports in the preset range on the single-chip microcomputer U3 is connected with one end of the resistor R15 in the control circuit respectively;

[0127] The other end of the resistor R15 is connected with the base of the triode Q3.

[0128] The emitter of the triode Q3 is connected with the first direct current power supply end Vout1 (i.e. the power supply end 3V3, which is used for outputting and providing 3.3V direct current power supply) in the auxiliary power supply.

[0129] The collector of the triode Q3 is connected with the first pin of the optical coupler TF2.

[0130] The second pin of the optical coupler TF2 is connected with GND1 (ground) through the resistor R16.

[0131] The fourth pin of the optical coupler TF2 is connected with the second direct current power supply end Vout2 (i.e. the power supply end +12V, which is used for outputting and providing 12V direct current power supply) in the auxiliary power supply.

[0132] The third pin of the optical coupler TF2 is connected with the base of the triode Q4 through the resistor R17.

[0133] The emitter of the triode Q4 is connected with GND1 (ground).

[0134] The collector of the triode Q4 is connected with the second direct current power supply end Vout2 (i.e. the power supply end +12V, which is used for outputting and providing 12V direct current power supply) in the auxiliary power supply through the diode D2.

[0135] The two ends of the diode D2 are connected with the two ends of the coil of the control relay KC in the main circuit respectively.

[0136] It is to be noted that the diode D2 is connected in parallel with the coil of the control relay KC.

[0137] In the specific implementation, the third pin of the optical coupler TF2 is also connected with GND1 (ground) through the resistor R18.

[0138] It is to 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 microcomputer U3 are used as the control signal output ports for the control circuit in the utility model, Figure 7The shown is an example of one of the control circuits connected to the PB5 (pin 57 of the single-chip microcomputer U3). The control circuits connected to these control signal output ports are identically designed control circuits.

[0139] In a specific implementation, the resistor R15 is a current-limiting resistor with a resistance of 5.1KΩ.

[0140] The resistor R16 provides a current for the primary side of the optocoupler and has a resistance of 1.5KΩ.

[0141] The resistor R17 is a current-limiting resistor with a resistance of 39KΩ.

[0142] The resistor R18 is a voltage-dividing resistor with a resistance of 100KΩ.

[0143] In a specific implementation, the transistor Q3 is a PNP-type transistor with a model number of S8550.

[0144] The transistor Q4 is an NPN-type transistor with a model number of S8050.

[0145] In a specific implementation, the optocoupler TF2 is an optocoupler with a model number of TLP521GB-S produced by the Youtai Semiconductor Co., Ltd.

[0146] It should be noted that the pin 1 of the optocoupler TF2 is the anode of the primary-side light-emitting diode and is connected to the collector of the transistor Q3; the pin 2 of the optocoupler TF2 is the cathode of the primary-side light-emitting diode and is connected to the GND1 through the resistor R16; the pin 3 of the optocoupler TF2 is the emitter of the secondary-side transistor and is connected to the base of the transistor Q4 through the resistor R17; and the pin 4 of the optocoupler TF2 is the collector of the secondary-side transistor and is connected to the power supply Vout2 (i.e., the second DC power supply terminal Vout2). When the primary-side pins 1 and 2 of the optocoupler TF2 are turned on, the light-emitting diode generates photoelectrons, which turn on the secondary-side transistor, and the secondary-side pins 3 and 4 (i.e., the emitter and the collector of the secondary-side transistor) are turned on.

[0147] In a specific implementation, the diode D2 is a protection device for the coil of the control relay KC and has a model number of 1N4001.

[0148] In a specific implementation, the control relay KC needs to satisfy the coil voltage of 12V and has a model number of HF116-2.

[0149] In a specific implementation, the action time of the control relay KC in the control circuit can be set in advance (e.g., by using the software matched with the control relay KC).

[0150] In the utility model, the control relay KC is a mature electrical element, and the specific model can be the Hongfa HF116-2 type relay produced by Xiamen Hongfa Electrical Acoustics Co., Ltd. Figure 2 The coil contact points of the control relay KC are 0 and 1, and the two groups of normally open contact points are (2, 4) and (6, 8).

[0151] It should be noted that, under the condition of power supply (220V), the two groups of normally open contact points (2, 4) and (6, 8) of the coil contact points 0 and 1 of the control relay KC change from open to closed.

[0152] In the utility model, the rated current of the main contact point of the Hongfa HF116-2 relay is 30A, and the specific power can be selected according to the specific circuit. Figure 1 The control relay KC is not limited to the type and specification in the utility model, and any relay that meets the functions and structures of the control relay KC can be used.

[0153] In the utility model, the control relay KC has two groups of contact points, and the two groups of contact points (contact points) are (2, 4) and (6, 8). Figure 1 As shown in the figure, the input L and N (i.e. the live wire input end L and the zero line input end N) of the alternating current load F and the live wire end L and the zero line end N of the emergency power supply B are connected.

[0154] In the utility model, the contact point flow of the main relay KA should meet the requirement of the maximum load current of the power supply screen, and is not less than 20A, and the NDC2J-32 / 31 / 2P is selected.

[0155] In the utility model, the main relay KA is a mature electrical element, and the specific model can be the Liangxin NDC2J-32 / 31 / 2P type relay produced by Shanghai Liangxin Electrical Appliance Co., Ltd. Figure 3 As shown in the figure, the coil contact points of the main relay KA are A1 and A2, the three groups of normally open contact points are (R1, R2), (3, 4) and (5, 6), and the group of normally closed contact points is (7, 8).

[0156] It should be noted that, under the condition of power supply (220V), the three groups of normally open contact points (R1, R2), (3, 4) and (5, 6) of the coil contact points A1 and A2 of the main relay KA change from open to closed, and the group of normally closed contact points (7, 8) changes from closed to open.

[0157] In a specific implementation, the main contact rated current of the Liangxin NDC2J-32 / 31 / 2P relay is 32A current, and the specific power can be selected according to the specific circuit and the different specifications of the relay. The main relay KA is not limited to the type and specification in the utility model. As long as it meets Figure 1 Any one of the existing relays with the functions and structures of the relay KA can be adopted.

[0158] In the utility model, two groups of contacts on the main relay KA are utilized, and the two groups of contacts (contacts) are (3, 4) and (5, 6), as shown in the drawings. Figure 1 The input L and N (i.e. the live wire input end L and the zero line input end N) of the alternating current load F and the live wire end L and the zero line end N of the conventional power supply B are connected respectively.

[0159] Based on the multi-output switching circuit provided by the utility model, the utility model further provides a railway signal power supply screen, which comprises the multi-output switching circuit as described above.

[0160] In a specific implementation, the multi-output switching circuit comprises a multi-alternating current output end.

[0161] The multi-alternating current output end is connected with a plurality of alternating current loads F (i.e. alternating current electrical equipment) respectively.

[0162] In order to more clearly understand the technical scheme of the utility model, the working principle of the utility model is described as follows.

[0163] I. When the railway signal power supply screen system works normally, the conventional power supply A supplies power to the plurality of alternating current loads F through the normally open contact (specifically the fourth contact and the sixth contact) of the main relay KA, and at the same time, the coil of the main relay KA is powered to be closed, and the auxiliary normally closed contact (i.e. the seventh contact and the eighth contact) of the main relay KA is disconnected.

[0164] At this time, any one of the contact state detection ports of the main relay KA, i.e. any one of the I / O ports PB6-PB15 (i.e. pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36) and the ports PC0-PC9 (i.e. pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40) of the single-chip microcomputer U3 (for example, the 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 (for example, pin 38) is at a high level (for example, a 3.3V level greater than 0), and the control program of the single-chip microcomputer U3 detects the high level, so that one control signal output port (for example, pin 56 corresponding to pin 38) of the single-chip microcomputer U3 outputs a high level to the connected sub-control circuit, so that the transistor Q3 in the sub-control circuit is cut off, the optocoupler TF2 is cut off, the transistor Q4 is cut off, the coil of the control relay KC is not powered, and the normally open contacts (specifically the 8th contact and the 4th contact) of the control relay KC cannot be turned on to connect the emergency power supply B, so that the emergency power supply B has no output.

[0165] II. When any one of the AC outputs (i.e. the power supply of any one of the AC loads F) is abnormal (i.e. stops supplying power to an AC load F due to power supply abnormality), the coil of the main relay KA corresponding to the abnormal AC output circuit is de-energized and released, and the normally closed contacts (i.e. the 7th and 8th contacts) of the main relay KA are closed;

[0166] At this time, the main relay KA corresponding to one of the contact state detection ports on each abnormal alternating current output loop, 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 microcomputer U3 (for example, the PC7 port, i.e. pin 38), since the contact state detection port is connected to the 7th contact (normally closed contact) of the main relay KA, and as described above, in view of the closure of the 7th and 8th contacts of the main relay KA, the contact state detection port (for example, pin 38) corresponding to the main relay KA on the abnormal alternating current output loop is at a low level (i.e. grounded, voltage 0), and the control program of the single-chip microcomputer U3 detects the low level, and sets one of the control signal output ports (for example, pin 56 corresponding to pin 38) of the single-chip microcomputer U3 to a low level, i.e. outputs a low level to the connected sub-control circuit, so that the triode Q3, the optocoupler TF2 and the triode Q4 in the sub-control circuit are turned on, the coil of the control relay KC is powered, the normally open contact of the control relay KC is connected to the emergency power supply B (specifically, the 8th contact and the 6th contact are closed and connected, and the 4th contact and the 2nd contact are closed and connected), so that the output of the emergency power supply B continues to supply power to the alternating current load F.

[0167] Compared with the prior art, the multi-output switching circuit has the following beneficial effects:

[0168] 1. The circuit of the utility model is a circuit capable of realizing automatic switching of multiple outputs of a railway signal power supply screen, which has reasonable structure, high practicability, simple operation and high reliability.

[0169] 2. The circuit of the utility model effectively meets the functional requirement of automatically switching to an emergency power supply after a fault of a multiple alternating current output loop of a railway signal power supply screen.

[0170] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements should also be regarded as the protection range of the utility model.

Claims

1. A multi-output switching circuit, characterized in that, include: Multi-output switching device and main circuit; The main circuit includes: multiple main relays KA and multiple control relays KC; The two ends of the coil of each main relay KA are connected to the live wire L and the neutral wire N of the conventional power supply A, respectively. The 3rd and 5th contacts of each main relay KA are connected to the live wire L and neutral wire N of the conventional power supply A, respectively. The 4th and 6th contacts of each main relay KA are connected to the live wire input L and the neutral wire input N of an AC load F, respectively. The 7th contact of each main relay KA is connected to the detection circuit in the multiplexer; 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 wire L and neutral wire N of the emergency power supply B, respectively. The 6th and 2nd contacts of each control relay KC are connected to the live wire input L and neutral wire input N of an AC load F, respectively. The two ends of the coil of each control relay KC are connected to the control circuit in the multiple output switching device; The multi-output switching device includes: a detection circuit, an auxiliary power supply, and a control circuit; The detection circuit is connected to both the auxiliary power supply and the control circuit. 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 outage occurs in the main circuit to any AC load F. Auxiliary power supply, used to provide operating power to the detection circuit and control circuit; The control circuit is used to control the connection of the emergency power supply B according to the control signal output by the detection circuit, so as to ensure the power supply to the AC load F.

2. The multi-output switching circuit as described in 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 coil of one or more main relays KA is de-energized and released.

3. The multi-output switching circuit as described in claim 1, characterized in that, The detection circuit includes a microcontroller 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 then connected to pins 5 and 6 of U3; Pin 5 of microcontroller U3 is connected to GND1 via capacitor C5; Pin 6 of microcontroller U3 is connected to GND1 via capacitor C6; Pins 5 and 6 of the microcontroller U3 are also connected to the two ends of resistor R2 and the two ends of crystal oscillator Y1, respectively.

4. The multi-output switching circuit as described in claim 3, characterized in that, Multiple detection ports with a preset range on the microcontroller U3 are each connected to the detection branch of a main relay KA; The detection branch of each relay KA includes resistor R6; One end of resistor R6 is connected to one of the multiple ports within a preset range on microcontroller U3, and to the normally closed contact 7 of a main relay KA. The other end of 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-output switching circuit as described in claim 4, characterized in that, Multiple detection ports with a preset range on the microcontroller U3 include: pins 8, 9, 10, 11, 24, 25, 37, 38, 39 and 40 of the microcontroller U3, and pins 58, 59, 61, 62, 29, 30, 33, 34, 35 and 36.

6. The multi-output switching circuit as described in claim 3, characterized in that, For the detection circuit, pin 7 of the microcontroller U3 is connected to the first DC power supply terminal Vout1 through resistor R4; Pin 60 of microcontroller U3 is connected to GND1 through resistor R3; And / or, For the detection circuit, pins 13, 19, 32, 48 and 64 of the microcontroller U3 are connected to the first DC power supply terminal Vout1, respectively. 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 microcontroller U3 is connected to one end of the filter capacitors C7 to C11 respectively; The other ends of the filter capacitors C7 to C11 are connected to GND1.

7. The multi-output switching circuit as described in claim 1, characterized in that, The auxiliary power supply includes: terminal block J1, fuse F1, varistor RV, resistor R1, power module U1, power conversion chip U2, and capacitors C1 to C4. Terminal 1 on terminal J1 is connected to one end of 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 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 resistor R1 is connected to pin 1 of power module U1; Pin 4 of power module U1 is connected to the second DC power supply terminal Vout2, one end of capacitor C1, one end of capacitor C2, and pin 3 of power conversion chip U2, respectively. Pin 3 of power module U1 is connected to the other end of capacitor C1, the other end of capacitor C2, and pin 1 of power conversion chip U2, respectively. Pin 3 of power module U1 is connected to GND1; Pin 2 of the power conversion chip U2 is connected to one end of capacitor C3, one end of capacitor C4, and the first DC power supply terminal Vout1, respectively. One end of capacitor C3 and one end of capacitor C4 are connected to GND1; Terminals 1 and 2 on terminal J1 are connected to the live wire L and neutral wire N of emergency power supply B, respectively.

8. The multi-output switching circuit as described in claim 1, characterized in that, The control circuit includes multiple sub-control circuits; Multiple I / O ports within a preset range on the microcontroller U3 are each connected to a sub-control circuit; Each sub-control circuit includes: resistors R15 to R18, transistor Q3, optocoupler TF2, transistor Q4, and diode D2; Each of the multiple I / O ports within a preset range on the microcontroller U3 is connected to one end of a resistor R15 in a control circuit. The other end of resistor R15 is connected to the base of transistor Q3; The emitter of transistor Q3 is connected to the first DC power supply terminal Vout1 in the auxiliary power supply; The collector of transistor Q3 is connected to pin 1 of optocoupler TF2; Pin 2 of optocoupler TF2 is connected to GND1 via resistor R16; Pin 4 of optocoupler TF2 is connected to the second DC power supply terminal Vout2 in the auxiliary power supply; Pin 3 of optocoupler TF2 is connected to the base of transistor Q4 through resistor R17; The emitter of transistor Q4 is connected to GND1; The collector of transistor Q4 is connected to the second DC power supply terminal Vout2 in the auxiliary power supply through diode D2; The two ends of diode D2 are connected to the two ends of the coil of control relay KC in the main circuit.

9. The multi-output switching circuit as described in claim 8, characterized in that, Multiple I / O ports with 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, Pin 3 of optocoupler TF2 is also connected to GND1 via resistor R18.

10. A railway signal power supply panel, characterized in that, Includes a multiplexer circuit as described in any one of claims 1 to 9.

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