Power generator for fault self-fusing signal lamp
阅读说明：本技术 故障自熔断信号灯电源发生器 (Power generator for fault self-fusing signal lamp ) 是由 何通 万泽清 于 2019-12-18 设计创作，主要内容包括：本发明提供一种故障自熔断信号灯电源发生器,包括：交流电滤波防护与整流电路、电路残压消除电路、高效开关电源发生电路、电流限流检测电路、熔断驱动电路；交流电滤波防护与整流电路用于过滤输入交流电中的干扰信号与浪涌信号,然后整流得到高压直流电源VAC、VSS；电路残压消除电路用于消除电网中的低压残压电压；高效开关电源发生电路的输入是高压直流电源VAC、VSS,输出低压直流电压V+、V-,以及低压直流供电电压V5+；电流限流检测电路用于检测负载的电流大小,当负载电流超过正常范围最大值或低于正常范围最小值时,产生一个负载故障信号COF,并向熔断驱动电路发送；该电源发生器成本低,使用方便,安全可靠。(The invention provides a power supply generator of a fault self-fusing signal lamp, which comprises: the circuit comprises an alternating current filtering protection and rectification circuit, a circuit residual voltage elimination circuit, a high-efficiency switching power supply generation circuit, a current limiting detection circuit and a fusing drive circuit; the alternating current filtering protection and rectification circuit is used for filtering interference signals and surge signals in input alternating current and then rectifying the interference signals and the surge signals to obtain high-voltage direct current power supplies VAC and VSS; the circuit residual voltage elimination circuit is used for eliminating low-voltage residual voltage in a power grid; the input of the high-efficiency switching power supply generating circuit is high-voltage direct-current power supplies VAC and VSS, and low-voltage direct-current voltages V +, V-and low-voltage direct-current power supply voltage V5+ are output; the current limiting detection circuit is used for detecting the current of a load, generating a load fault signal COF when the current of the load exceeds the maximum value of a normal range or is lower than the minimum value of the normal range, and sending the load fault signal COF to the fusing drive circuit; the power generator has the advantages of low cost, convenient use, safety and reliability.)
1. A fault self-fusing signal lamp power generator, comprising: the circuit comprises an alternating current filtering protection and rectification circuit, a circuit residual voltage elimination circuit, a high-efficiency switching power supply generation circuit, a current limiting detection circuit and a fusing drive circuit;
the alternating current filtering protection and rectification circuit is used for filtering interference signals and surge signals in input alternating current and then rectifying the signals to obtain high-voltage direct current power supplies VAC and VSS;
the circuit residual voltage elimination circuit is used for eliminating low-voltage residual voltage in a power grid and providing clean high-voltage direct-current power sources VAC and VSS for the high-efficiency switch power source generation circuit;
the input of the high-efficiency switching power supply generating circuit is high-voltage direct-current power supplies VAC and VSS, and low-voltage direct-current voltages V +, V-and low-voltage direct-current power supply voltage V5+ are output;
the current limiting detection circuit is used for detecting the current of a load, generating a load fault signal COF when the current of the load exceeds the maximum value of a normal range or is lower than the minimum value of the normal range, and sending the load fault signal COF to the fusing drive circuit;
and the fusing driving circuit drives a relay arranged in the fusing driving circuit to act after receiving a load fault signal COF, so that a normally open contact of the relay is closed, and a fuse in the alternating current filtering protection and rectifying circuit is fused.
2. The fail self-fusing signal lamp power generator of claim 1,
the alternating current filtering protection and rectification circuit comprises: fuse F1, inductors L1, L2, piezoresistors MV1, MV2, capacitors C1, C3, C5, C6, C7, C9, rectifier diodes D2, D3, D4, D5, common-mode inductor GM1 and connector J1; the connector J1 is used for receiving input alternating current;
one end of a fuse F1 is connected with one end of a connector J1, and the other end is connected with one end of a capacitor C1, one end of an inductor L1 and one end of a piezoresistor MV 1; the other end of the capacitor C1 is connected with the other end of the connector J1, the other end of the piezoresistor MV1 and one end of the inductor L2; one end of the piezoresistor MV1 is a node ACL, and the other end is a node CAN; the other end of the inductor L1 is connected with one end of a capacitor C3 and the fourth end of a common mode inductor GM1, and the other end of the inductor L2 is connected with the other end of the capacitor C3 and the first end of a common mode inductor GM 1; the common-mode inductor GM1 is connected with one end of a capacitor C5, one end of a capacitor C6, one end of a piezoresistor MV2, the cathode of a rectifier diode D2 and the anode of a rectifier diode D4 in a third-end mode; the other end of the capacitor C6 is connected with the ground; the other end of the capacitor C5 is connected with one end of the capacitor C7, the other end of the voltage dependent resistor MV2, the cathode of the rectifier diode D3 and the anode of the rectifier diode D5; the other end of the capacitor C7 is connected with the ground; the cathodes of the rectifier diodes D4 and D5 are connected and connected with one end of a capacitor C9 to obtain a high-voltage direct-current power supply VAC; and anodes of the rectifier diodes D2 and D3 are connected and are connected with the other end of the capacitor C9 to obtain a high-voltage direct-current power supply VSS.
3. The fail self-fusing signal lamp power generator of claim 1,
the circuit residual voltage elimination circuit comprises diodes D6 and D7, NPN triodes Q3 and Q4, resistors R8, R9, R10 and R11, a Zener diode Z1, and capacitors C10 and C11;
the anode of the diode D6 is connected with a high-voltage direct-current power supply VAC and is connected with one end of a resistor R10 and one end of a resistor R11; the cathode of the diode D6 is connected with the cathode of the Zener diode Z1 through a resistor R8, the anode of the Zener diode Z1 is connected with the anode of a capacitor C10, one end of a resistor R9 and the base of a triode Q3; the negative electrode of the capacitor C10, the other end of the resistor R9 and the emitter of the triode Q3 are connected with a high-voltage direct-current power supply VSS; the other end of the resistor R10 is connected with the collector of the triode Q3, the anode of the capacitor C11, the cathode of the diode D7 and the base of the triode Q4; the negative electrode of the capacitor C11, the anode of the diode D7 and the emitter of the triode Q4 are connected with a high-voltage direct-current power supply VSS; the other end of the resistor R11 is connected with the emitter of the transistor Q4.
4. The fail self-fusing signal lamp power generator of claim 1,
the high-efficiency switching power supply generating circuit comprises: a power chip U1, a transformer T2, diodes D8, D9 and D10, a transient suppression diode TVS1, zener diodes Z2 and Z3, capacitors C12, C13, C17, C18, C19, C20 and C21, resistors R12, R19, R21, R23, R26, R27 and R28, and an optical coupler OP 1;
the high-voltage direct-current power supply VAC is connected with one end of a capacitor C12, one end of a resistor R12, one end of a capacitor C18, one end of a resistor R23 and one end of a primary winding of a transformer T2; the other end of the capacitor C12 is connected with a high-voltage direct-current power supply VSS; the other end of the resistor R12 is connected with one end of the capacitor C13, the cathode of the diode D8 and the power supply end of the power supply chip U1; the other end of the capacitor C13 and the ground of the power chip U1 are connected with a high-voltage direct-current power supply VSS; the anode of the diode D8 is connected with one end of an auxiliary winding of a transformer T2, and the other end of the auxiliary winding of the transformer T2 is connected with a current sensing end of a power chip U1 through a resistor R19; the other end of the capacitor C18 and the other end of the resistor R23 are connected with the cathode of a diode D9; the anode of the diode D9 is connected with the other end of the primary winding of the transformer T2 and the driving end of the power chip U1; the feedback end of the power chip U1 is connected with one end of a resistor R21 and one end of a capacitor C21, and the other end of the resistor R21 is connected with the collector of the output end of an optical coupler OP 1; the other end of the capacitor C21 and an emitter at the output end of the optical coupler OP1 are connected with a high-voltage direct-current power supply VSS; the soft starting end of the power chip U1 is connected with a high-voltage direct-current power supply VSS through a capacitor C17;
one end of a secondary winding of the transformer T2 is connected with the anode of a diode D10, the cathode of a diode D10 is connected with the anode of a capacitor C19, the cathode of a transient suppression diode TVS1, one end of a resistor R26 and one end of a resistor R27, and low-voltage direct-current voltage V + is output; the other end of the secondary winding of the transformer T2 is connected with the negative electrode of the capacitor C19, the anode of the transient suppression diode TVS1, one end of the resistor R28 and the power ground; the other end of the resistor R28 outputs a low-voltage direct-current voltage V-;
the other end of the resistor R26 is connected with the cathode of a Zener diode Z2, the anode of the Zener diode Z2 is connected with the anode of the input end of an optical coupler OP1, and the cathode of the input end of the optical coupler OP1 is connected with the power ground;
the other end of the resistor R27 is connected with the cathode of the Zener diode Z3 and the anode of the capacitor C20, and outputs low-voltage direct-current supply voltage V5 +; the anode of the Zener diode Z3 and the cathode of the capacitor C20 are connected with the power ground.
5. The fail self-fusing signal lamp power generator of claim 1,
a resistor R28 is connected between the low-voltage direct-current voltage V-and the power ground;
the current limiting detection circuit comprises voltage comparators U2A and U2B, an OR gate U3A, resistors R13, R14, R15, R16, R17, R20, R22, R24 and R25, capacitors C14, C15, C16 and C22;
the low-voltage direct-current voltage V-is connected with one end of a resistor R13, the other end of the resistor R13 is connected with one ends of capacitors C14 and C16, and a voltage comparator U2A non-inverting input end and a voltage comparator U2B inverting input end; the other ends of the capacitors C14 and C16 are connected with a power ground; one end of the resistor R14 is connected with a low-voltage DC supply voltage V5+, the other end is connected with one end of a resistor R15, one end of a capacitor C22 and the inverting input end of a voltage comparator U2A; the other end of the resistor R15 and the other end of the capacitor C22 are connected with the power ground; one end of the resistor R16 is connected with a low-voltage direct-current supply voltage V5+, the other end of the resistor R16 is connected with one end of a resistor R17, one end of a capacitor C15 and the non-inverting input end of a voltage comparator U2B; the other end of the resistor R17 and the other end of the capacitor C15 are connected with the power ground;
the output end of the voltage comparator U2A is connected with one end of a resistor R20, the other end of the resistor R20 is connected with one input end of an OR gate U3A, and the other end of the resistor R24 is connected with the power ground; the output end of the voltage comparator U2B is connected with one end of a resistor R22, the other end of the resistor R22 is connected with the other input end of an OR gate U3A, and the other end of the resistor R25 is connected with the power ground; the output of or gate U3A outputs a load fault signal COF.
6. The fail self-fusing signal lamp power generator of claim 2,
the fusing driving circuit comprises a power supply monitor T1, NPN triodes Q1 and Q2, a relay K1, a diode D1, resistors R1, R2, R3, R4, R5, R6 and R7, capacitors C2, C4 and C8;
the output low-voltage direct-current voltage V + is connected with one end of a resistor R1, one end of a resistor R2 and one end of a resistor R6; the other end of the resistor R1 is connected with one end of a capacitor C2 and a power supply input end of a power supply monitor T1, and the other end of the capacitor C2 and the grounding end of the power supply monitor T1 are connected with the power supply ground; the output end of the power supply monitor T1 is connected with the other end of the resistor R2, one end of the resistor R3 and one end of the capacitor C4; the other end of the capacitor C4 is connected with a power ground, the other end of the resistor R3 is connected with the base electrode of the triode Q1, and the other end of the resistor R6 is connected with the collector electrode of the triode Q1; an emitter of the triode Q1 is connected with the cathode of the diode D1 and one end of the coil of the relay K1; the anode of the diode D1 and the other end of the coil of the relay K1 are connected with the collector of a triode Q2; the base electrode of the triode Q2 is connected with one end of a resistor R5 and one end of a capacitor C8; the other end of the resistor R5 is connected with one end of the resistor R4 and a load fault signal COF; the other end of the resistor R4, the other end of the capacitor C8 and an emitter of the triode Q2 are connected with a power ground; two ends of a normally open contact of the relay K1 are connected with nodes ACL and CAN in the alternating current filtering protection and rectification circuit.
Technical Field
The invention relates to a signal lamp for intelligent traffic, which is used at a road intersection for indicating the passing of vehicles, and is provided with a plurality of types of signal lamps for indicating different road signals and indicating the passing and waiting of vehicles or pedestrians, wherein internal power generators of the signal lamps can be the same although the types of the signal lamps are different.
Background
Along with the great development of the urbanization in China, more and more residents exist in cities and towns, the national economy is better, the vehicle retention rate of people is higher and higher, the urban road traffic is more and more crowded, and intelligent traffic is developed in each city to solve the road traffic problem. The most effective control means of intelligent traffic at the present stage is a road traffic signal machine and a signal system, and the traffic signal machine also needs a traffic signal to be matched with the traffic signal machine so as to complete the release of the road traffic flow. Along with the expansion of cities, road traffic is also increased, the number of intersections is also increased rapidly, the demand for signal lamps is also expanded rapidly, and a plurality of manufacturers specialized in signal lamp and signal machine production appear in China, so that competition in the aspect of signal lamps in China is encouraged more and more, the requirements on the appearance and quality of the signal lamps are also improved gradually, and the requirements on power supply adaptation are also increased more and more. In order to improve the competitiveness of products in the market, the investment of various companies in power supply design is increased and the technical difficulty is improved.
Disclosure of Invention
The invention aims to improve the safety and reliability of the design of a signal lamp power supply, and provides a fault self-fusing signal lamp power supply generator which is low in cost, convenient to use, safe and reliable. The technical scheme adopted by the invention is as follows:
a fault self-fusing signal lamp power generator comprising: the circuit comprises an alternating current filtering protection and rectification circuit, a circuit residual voltage elimination circuit, a high-efficiency switching power supply generation circuit, a current limiting detection circuit and a fusing drive circuit;
the alternating current filtering protection and rectification circuit is used for filtering interference signals and surge signals in input alternating current and then rectifying the signals to obtain high-voltage direct current power supplies VAC and VSS;
the circuit residual voltage elimination circuit is used for eliminating low-voltage residual voltage in a power grid and providing clean high-voltage direct-current power sources VAC and VSS for the high-efficiency switch power source generation circuit;
the input of the high-efficiency switching power supply generating circuit is high-voltage direct-current power supplies VAC and VSS, and low-voltage direct-current voltages V +, V-and low-voltage direct-current power supply voltage V5+ are output;
the current limiting detection circuit is used for detecting the current of a load, generating a load fault signal COF when the current of the load exceeds the maximum value of a normal range or is lower than the minimum value of the normal range, and sending the load fault signal COF to the fusing drive circuit;
and the fusing driving circuit drives a relay arranged in the fusing driving circuit to act after receiving a load fault signal COF, so that a normally open contact of the relay is closed, and a fuse in the alternating current filtering protection and rectifying circuit is fused.
Further, the alternating current filtering protection and rectification circuit comprises: fuse F1, inductors L1, L2, piezoresistors MV1, MV2, capacitors C1, C3, C5, C6, C7, C9, rectifier diodes D2, D3, D4, D5, common-mode inductor GM1 and connector J1; the connector J1 is used for receiving input alternating current;
one end of a fuse F1 is connected with one end of a connector J1, and the other end is connected with one end of a capacitor C1, one end of an inductor L1 and one end of a
Further, the circuit residual voltage elimination circuit comprises diodes D6 and D7, NPN triodes Q3 and Q4, resistors R8, R9, R10 and R11, a Zener diode Z1 and capacitors C10 and C11;
the anode of the diode D6 is connected with a high-voltage direct-current power supply VAC and is connected with one end of a resistor R10 and one end of a resistor R11; the cathode of the diode D6 is connected with the cathode of the Zener diode Z1 through a resistor R8, the anode of the Zener diode Z1 is connected with the anode of a capacitor C10, one end of a resistor R9 and the base of a triode Q3; the negative electrode of the capacitor C10, the other end of the resistor R9 and the emitter of the triode Q3 are connected with a high-voltage direct-current power supply VSS; the other end of the resistor R10 is connected with the collector of the triode Q3, the anode of the capacitor C11, the cathode of the diode D7 and the base of the triode Q4; the negative electrode of the capacitor C11, the anode of the diode D7 and the emitter of the triode Q4 are connected with a high-voltage direct-current power supply VSS; the other end of the resistor R11 is connected with the emitter of the transistor Q4.
Further, the high-efficiency switching power supply generation circuit includes: a power chip U1, a transformer T2, diodes D8, D9 and D10, a transient suppression diode TVS1, zener diodes Z2 and Z3, capacitors C12, C13, C17, C18, C19, C20 and C21, resistors R12, R19, R21, R23, R26, R27 and R28, and an
the high-voltage direct-current power supply VAC is connected with one end of a capacitor C12, one end of a resistor R12, one end of a capacitor C18, one end of a resistor R23 and one end of a primary winding of a transformer T2; the other end of the capacitor C12 is connected with a high-voltage direct-current power supply VSS; the other end of the resistor R12 is connected with one end of the capacitor C13, the cathode of the diode D8 and the power supply end of the power supply chip U1; the other end of the capacitor C13 and the ground of the power chip U1 are connected with a high-voltage direct-current power supply VSS; the anode of the diode D8 is connected with one end of an auxiliary winding of a transformer T2, and the other end of the auxiliary winding of the transformer T2 is connected with a current sensing end of a power chip U1 through a resistor R19; the other end of the capacitor C18 and the other end of the resistor R23 are connected with the cathode of a diode D9; the anode of the diode D9 is connected with the other end of the primary winding of the transformer T2 and the driving end of the power chip U1; the feedback end of the power chip U1 is connected with one end of a resistor R21 and one end of a capacitor C21, and the other end of the resistor R21 is connected with the collector of the output end of an
one end of a secondary winding of the transformer T2 is connected with the anode of a diode D10, the cathode of a diode D10 is connected with the anode of a capacitor C19, the cathode of a transient suppression diode TVS1, one end of a resistor R26 and one end of a resistor R27, and low-voltage direct-current voltage V + is output; the other end of the secondary winding of the transformer T2 is connected with the negative electrode of the capacitor C19, the anode of the transient suppression diode TVS1, one end of the resistor R28 and the power ground; the other end of the resistor R28 outputs a low-voltage direct-current voltage V-;
the other end of the resistor R26 is connected with the cathode of a Zener diode Z2, the anode of the Zener diode Z2 is connected with the anode of the input end of an optical coupler OP1, and the cathode of the input end of the optical coupler OP1 is connected with the power ground;
the other end of the resistor R27 is connected with the cathode of the Zener diode Z3 and the anode of the capacitor C20, and outputs low-voltage direct-current supply voltage V5 +; the anode of the Zener diode Z3 and the cathode of the capacitor C20 are connected with the power ground.
Further, a resistor R28 is connected between the low-voltage direct-current voltage V-and the power ground;
the current limiting detection circuit comprises voltage comparators U2A and U2B, an OR gate U3A, resistors R13, R14, R15, R16, R17, R20, R22, R24 and R25, capacitors C14, C15, C16 and C22;
the low-voltage direct-current voltage V-is connected with one end of a resistor R13, the other end of the resistor R13 is connected with one ends of capacitors C14 and C16, and a voltage comparator U2A non-inverting input end and a voltage comparator U2B inverting input end; the other ends of the capacitors C14 and C16 are connected with a power ground; one end of the resistor R14 is connected with a low-voltage DC supply voltage V5+, the other end is connected with one end of a resistor R15, one end of a capacitor C22 and the inverting input end of a voltage comparator U2A; the other end of the resistor R15 and the other end of the capacitor C22 are connected with the power ground; one end of the resistor R16 is connected with a low-voltage direct-current supply voltage V5+, the other end of the resistor R16 is connected with one end of a resistor R17, one end of a capacitor C15 and the non-inverting input end of a voltage comparator U2B; the other end of the resistor R17 and the other end of the capacitor C15 are connected with the power ground;
the output end of the voltage comparator U2A is connected with one end of a resistor R20, the other end of the resistor R20 is connected with one input end of an OR gate U3A, and the other end of the resistor R24 is connected with the power ground; the output end of the voltage comparator U2B is connected with one end of a resistor R22, the other end of the resistor R22 is connected with the other input end of an OR gate U3A, and the other end of the resistor R25 is connected with the power ground; the output of or gate U3A outputs a load fault signal COF.
Further, the fusing driving circuit comprises a power supply monitor T1, NPN triodes Q1 and Q2, a relay K1, a diode D1, resistors R1, R2, R3, R4, R5, R6 and R7, and capacitors C2, C4 and C8;
the output low-voltage direct-current voltage V + is connected with one end of a resistor R1, one end of a resistor R2 and one end of a resistor R6; the other end of the resistor R1 is connected with one end of a capacitor C2 and a power supply input end of a power supply monitor T1, and the other end of the capacitor C2 and the grounding end of the power supply monitor T1 are connected with the power supply ground; the output end of the power supply monitor T1 is connected with the other end of the resistor R2, one end of the resistor R3 and one end of the capacitor C4; the other end of the capacitor C4 is connected with a power ground, the other end of the resistor R3 is connected with the base electrode of the triode Q1, and the other end of the resistor R6 is connected with the collector electrode of the triode Q1; an emitter of the triode Q1 is connected with the cathode of the diode D1 and one end of the coil of the relay K1; the anode of the diode D1 and the other end of the coil of the relay K1 are connected with the collector of a triode Q2; the base electrode of the triode Q2 is connected with one end of a resistor R5 and one end of a capacitor C8; the other end of the resistor R5 is connected with one end of the resistor R4 and a load fault signal COF; the other end of the resistor R4, the other end of the capacitor C8 and an emitter of the triode Q2 are connected with a power ground; two ends of a normally open contact of the relay K1 are connected with nodes ACL and CAN in the alternating current filtering protection and rectification circuit.
The invention has the advantages that: the current-limiting circuit is flexible to set, the driving output power is high, the requirements of signal lamps of almost all models can be met, all hardware of the circuit adopts industrial-grade devices, the operation is stable and reliable, and the environment adaptation range is wide. The circuit device is low in general cost and easy to maintain. The product has multiple functions and can meet various defects of field use, the realization principle and the conception of the product are ingenious, and the product can flexibly and completely meet field requirements. The circuit is provided with a multiple filter circuit and a protection circuit, and can meet various complex electromagnetic environments.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic diagram of an ac filtering protection and rectification circuit according to the present invention.
FIG. 3 is a schematic diagram of the circuit residual voltage eliminating circuit of the present invention.
Fig. 4 is a schematic diagram of a high-efficiency switching power supply generating circuit of the present invention.
FIG. 5 is a schematic diagram of a current limit detection circuit according to the present invention.
FIG. 6 is a schematic diagram of a fuse driving circuit according to the present invention.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
An embodiment of the present invention provides a power generator for a fault self-fusing signal lamp, as shown in fig. 1, including: the circuit comprises an alternating current filtering protection and rectification circuit, a circuit residual voltage elimination circuit, a high-efficiency switching power supply generation circuit, a current limiting detection circuit and a fusing drive circuit;
the alternating current filtering protection and rectification circuit is used for filtering interference signals and surge signals in input alternating current and then rectifying the signals to obtain high-voltage direct current power supplies VAC and VSS; a safe and reliable power supply is provided for a subsequent circuit;
the circuit residual voltage elimination circuit is used for eliminating low-voltage residual voltage in a power grid and providing clean high-voltage direct-current power sources VAC and VSS for the high-efficiency switch power source generation circuit;
the input of the high-efficiency switching power supply generating circuit is a high-voltage direct-current power supply VAC and a high-voltage direct-current power supply VSS, and low-voltage direct-current voltage V +, V-and low-voltage direct-current power supply voltage V5+ are output after voltage conversion; wherein, a resistor R28 is connected between the low-voltage DC voltage V-and the power ground;
the current limiting detection circuit is used for detecting the current of a load, generating a load fault signal COF when the current of the load exceeds the maximum value of a normal range or is lower than the minimum value of the normal range, and sending the load fault signal COF to the fusing drive circuit;
and the fusing driving circuit drives a relay arranged in the fusing driving circuit to act after receiving a load fault signal COF, so that a normally open contact of the relay is closed, and a fuse in the alternating current filtering protection and rectifying circuit is fused.
The alternating current filtering protection and rectification circuit can provide a clean and safe input power supply for the circuit residual voltage elimination circuit and the efficient switching power supply generation circuit, eliminate high-voltage interference and surge interference caused by lightning stroke, static electricity or other high-voltage equipment brought into the power grid, and then rectify the input alternating current and output high-voltage direct current power supplies VAC and VSS;
as shown in fig. 2, the ac filtering protection and rectification circuit includes: fuse F1, inductors L1, L2, piezoresistors MV1, MV2, capacitors C1, C3, C5, C6, C7, C9, rectifier diodes D2, D3, D4, D5, common-mode inductor GM1 and connector J1; the connector J1 is used for receiving input alternating current;
one end of a fuse F1 is connected with one end of a connector J1, and the other end is connected with one end of a capacitor C1, one end of an inductor L1 and one end of a
The design purpose of the circuit residual voltage elimination circuit is as follows: because of the low-voltage residual voltage brought by the parasitic capacitance of various switching devices in a complex power grid, the unstable voltage can cause the uncertainty of a subsequent circuit, and the circuit residual voltage elimination circuit is to eliminate a low-voltage residual voltage signal within 90V and is arranged between an alternating current filtering protection and rectification circuit and a high-efficiency switching power supply generation circuit so as to further eliminate an interference power supply and provide a clean high-voltage direct-current power supply for the high-efficiency switching power supply generation circuit;
as shown in fig. 3, the circuit residual voltage elimination circuit includes diodes D6 and D7, NPN triodes Q3 and Q4, resistors R8, R9, R10 and R11, a zener diode Z1, and capacitors C10 and C11;
the anode of the diode D6 is connected with a high-voltage direct-current power supply VAC and is connected with one end of a resistor R10 and one end of a resistor R11; the cathode of the diode D6 is connected with the cathode of the Zener diode Z1 through a resistor R8, the anode of the Zener diode Z1 is connected with the anode of a capacitor C10, one end of a resistor R9 and the base of a triode Q3; the negative electrode of the capacitor C10, the other end of the resistor R9 and the emitter of the triode Q3 are connected with a high-voltage direct-current power supply VSS; the other end of the resistor R10 is connected with the collector of the triode Q3, the anode of the capacitor C11, the cathode of the diode D7 and the base of the triode Q4; the negative electrode of the capacitor C11, the anode of the diode D7 and the emitter of the triode Q4 are connected with a high-voltage direct-current power supply VSS; the other end of the resistor R11 is connected with the emitter of the transistor Q4.
The high-efficiency switching power supply generating circuit converts input high-voltage direct-current power supplies VAC and VSS into low-voltage direct-current voltage V +, V-and low-voltage direct-current power supply voltage V5 +; the low-voltage direct-current voltage V + and V-is 12V, the output power is not lower than 25W, and the requirements of almost all signal lamps in China can be met; the voltage of the low-voltage direct-current power supply voltage V5+ is 5V, and a working power supply can be provided for a subsequent current limiting detection circuit and a fusing driving circuit;
as shown in fig. 4, the high-efficiency switching power supply generation circuit includes: a power chip U1 (model number ICE2A0565), a transformer T2, diodes D8, D9, D10, a transient suppression diode TVS1, zener diodes Z2 and Z3, capacitors C12, C13, C17, C18, C19, C20 and C21, resistors R12, R19, R21, R23, R26, R27 and R28, and an OP
the high-voltage direct-current power supply VAC is connected with one end of a capacitor C12, one end of a resistor R12, one end of a capacitor C18, one end of a resistor R23 and one end of a primary winding of a transformer T2; the other end of the capacitor C12 is connected with a high-voltage direct-current power supply VSS; the other end of the resistor R12 is connected with one end of the capacitor C13, the cathode of the diode D8 and the power supply end of the power supply chip U1; the other end of the capacitor C13 and the ground of the power chip U1 are connected with a high-voltage direct-current power supply VSS; the anode of the diode D8 is connected with one end of an auxiliary winding of a transformer T2, and the other end of the auxiliary winding of the transformer T2 is connected with a current sensing end of a power chip U1 through a resistor R19; the other end of the capacitor C18 and the other end of the resistor R23 are connected with the cathode of a diode D9; the anode of the diode D9 is connected with the other end of the primary winding of the transformer T2 and the driving end (
one end of a secondary winding of the transformer T2 is connected with the anode of a diode D10, the cathode of a diode D10 is connected with the anode of a capacitor C19, the cathode of a transient suppression diode TVS1, one end of a resistor R26 and one end of a resistor R27, and low-voltage direct-current voltage V + is output; the other end of the secondary winding of the transformer T2 is connected with the negative electrode of the capacitor C19, the anode of the transient suppression diode TVS1, one end of the resistor R28 and the power ground; the other end of the resistor R28 outputs a low-voltage direct-current voltage V-;
the other end of the resistor R26 is connected with the cathode of a Zener diode Z2, the anode of the Zener diode Z2 is connected with the anode of the input end of an optical coupler OP1, and the cathode of the input end of the optical coupler OP1 is connected with the power ground;
the other end of the resistor R27 is connected with the cathode of the Zener diode Z3 and the anode of the capacitor C20, and outputs low-voltage direct-current supply voltage V5 +; the anode of the Zener diode Z3 and the cathode of the capacitor C20 are connected with the power ground.
The current limiting detection circuit is used for detecting the current of a load, generating a load fault signal COF when the current of the load exceeds the maximum value of a normal range or is lower than the minimum value of the normal range, and sending the load fault signal COF to the fusing drive circuit; the load (signal lamp) is connected between the low-voltage direct-current voltage V + and V-, and the resistor R28 exists in the resistor R28, so that the magnitude of the load current can be reflected by detecting the magnitude of the voltage V-at the right end of the resistor R28; when the load current exceeds the maximum value of the normal range, the signal lamp current exceeds the limit and is regarded as a short circuit, and when the load current is lower than the minimum value of the normal range, the signal lamp current is smaller and is regarded as an open circuit; if one of these two fault conditions is reached the circuit will output a load fault signal COF;
as shown in fig. 5, the current limiting detection circuit includes voltage comparators U2A, U2B, or gate U3A, resistors R13, R14, R15, R16, R17, R20, R22, R24, R25, capacitors C14, C15, C16, and C22;
the low-voltage direct-current voltage V-is connected with one end of a resistor R13, the other end of the resistor R13 is connected with one ends of capacitors C14 and C16, and a voltage comparator U2A non-inverting input end and a voltage comparator U2B inverting input end; the other ends of the capacitors C14 and C16 are connected with a power ground; one end of the resistor R14 is connected with a low-voltage DC supply voltage V5+, the other end is connected with one end of a resistor R15, one end of a capacitor C22 and the inverting input end of a voltage comparator U2A; the other end of the resistor R15 and the other end of the capacitor C22 are connected with the power ground; one end of the resistor R16 is connected with a low-voltage direct-current supply voltage V5+, the other end of the resistor R16 is connected with one end of a resistor R17, one end of a capacitor C15 and the non-inverting input end of a voltage comparator U2B; the other end of the resistor R17 and the other end of the capacitor C15 are connected with the power ground;
the output end of the voltage comparator U2A is connected with one end of a resistor R20, the other end of the resistor R20 is connected with one input end of an OR gate U3A, and the other end of the resistor R24 is connected with the power ground; the output end of the voltage comparator U2B is connected with one end of a resistor R22, the other end of the resistor R22 is connected with the other input end of an OR gate U3A, and the other end of the resistor R25 is connected with the power ground; the output end of the or gate U3A outputs a load fault signal COF;
after receiving a load fault signal COF, the fusing driving circuit drives a relay arranged in the fusing driving circuit to act, so that a normally open contact of the relay is closed, and the normally open contact of the relay is connected with nodes ACL and ACN in the alternating current filtering protection and rectifying circuit in parallel, so that the alternating current filtering protection and a fuse F1 in the rectifying circuit are fused; after the fuse F1 is fused, the signal lamp is separated from an alternating current power grid, interference or unsafe factors cannot be brought to the power grid, and the safety of equipment is improved;
as shown in fig. 6, the fusing driving circuit includes a power supply monitor T1 (model CAT803SN 308), NPN triodes Q1, Q2, a relay K1, a diode D1, resistors R1, R2, R3, R4, R5, R6, R7, capacitors C2, C4, and C8;
the output low-voltage direct-current voltage V + is connected with one end of a resistor R1, one end of a resistor R2 and one end of a resistor R6; the other end of the resistor R1 is connected with one end of a capacitor C2 and a power supply input end of a power supply monitor T1, and the other end of the capacitor C2 and the grounding end of the power supply monitor T1 are connected with the power supply ground; the output end of the power supply monitor T1 is connected with the other end of the resistor R2, one end of the resistor R3 and one end of the capacitor C4; the other end of the capacitor C4 is connected with a power ground, the other end of the resistor R3 is connected with the base electrode of the triode Q1, and the other end of the resistor R6 is connected with the collector electrode of the triode Q1; an emitter of the triode Q1 is connected with the cathode of the diode D1 and one end of the coil of the relay K1; the anode of the diode D1 and the other end of the coil of the relay K1 are connected with the collector of a triode Q2; the base electrode of the triode Q2 is connected with one end of a resistor R5 and one end of a capacitor C8; the other end of the resistor R5 is connected with one end of the resistor R4 and a load fault signal COF; the other end of the resistor R4, the other end of the capacitor C8 and an emitter of the triode Q2 are connected with a power ground; two ends of a normally open contact of the relay K1 are connected with nodes ACL and CAN in the alternating current filtering protection and rectification circuit.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
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