CN203243224U - Isolating power source circuit provided with signal isolating gate - Google Patents

Abstract

The utility model relates to an isolating power source circuit provided with a signal isolating gate. A prior isolating power source circuit has only one of functions of isolation and surge protection. The isolating power source circuit provided with the signal isolating gate provided by the utility model includes three isolating power sources, a filtering capacitor, a matching resistor, a current-limiting resistor, a delay capacitor, a TVS diode, a PNP triode, a PMOS tube, a light emitting tube, a self-recovery fuse and a gas discharging tube. An anode of the diode is connected with the positive electrode of an external power source. The positive electrode of the external power source serves as a total power input terminal of the whole isolating power source circuit provided with the signal isolating gate. A cathode of the diode is connected with power input pins of the three isolating power sources. Power output pins of two among the isolating power sources serve as isolating power source input terminals while a power output pin of the other one among the isolating power sources is connected with different power components. An input terminal of the gas discharging tube serves as an output terminal of the third isolating power source and supplies power for an external device. According to the utility model, power source isolation can be realized and interference among different signals is avoided. At the same time, the isolating power source circuit provided with the signal isolating gate has a function of short circuit protection, so that device damages or sparks caused by short circuit on account of error operation are avoided.

Description

A kind of signal isolated gate insulating power supply circuit

Technical field

The utility model belongs to the electroporation field, relates to a kind of signal isolated gate insulating power supply circuit.

Background technology

Along with microprocessor, the development that artificial intelligence technology is parallel, this gives instrument and meter industry to intelligent development, that is to say the instrument and meter of intelligentized robot, the raising of level of intelligence and the very fast speed that improves, this will allow people's life lighter.Along with the development of science and technology, instrument is of a great variety, needs a large amount of human and material resources to go to copy and gets instrumented data.Networking and teletransmission become new a kind of trend.

The table meter of Industry Control uses the networking of RS485 mode mostly, and networking is convenient, and wiring is simple.Be accompanied by wiring, problem has just occurred, and instrument is precision equipment, and wiring is disturbed once long easily the introducing, more seriously lightning induction.When thunder and lightning occurs, earth potential sharply raises near can causing building, owing to there being ground resistance, between two places, will produce huge electrical potential difference, this electrical potential difference is by the electronics grounding system, the two places electronic equipment connects wire can produce huge surge current, and electronic equipment is caused damage.When thunderbolt is discharged by lightning-protection system (such as lightning rod) outside the building, the electromagnetic field that huge lightning current produces can induce destructive voltage surge at building inner electronic equipment connecting cable, when thunder and lightning hits a trolley wire, will and near cable between produce very strong electric field, because its high frequency characteristics, by the coupling of the distributed capacitance between the cable, can produce voltage surge at the electronegative potential cable, thereby electronic equipment is damaged.Therefore electronic information should adopt the outside and inner lightning protection measures that combines to carry out integrated protection.Exterior protection adopts the safeguard procedures such as lightning rod, lightning conduction that thunder-strike current is guided to the earth.Must realize electrical grounding between internal Protection one side equipment room and the metallic conduit ground wire, various in electronic information and PERCOM peripheral communication transmission line port is installed the surge protection isolated gate on the other hand.

Guard grating in the market is of a great variety, and price and quality height does not wait, and what have only has a buffer action, and what have only has a surge protection effect, and that have only is RS485, and that have only is RS422.And the equipment of industry spot often is subjected to the restriction in space, can not every kind of function all fill an equipment.

Summary of the invention

The purpose of this utility model is exactly for the deficiencies in the prior art, and a kind of signal isolated gate insulating power supply circuit is provided.

The utility model comprises three insulating power supplies, three filter capacitors, three build-out resistors, a current-limiting resistance, a delay capacitor, a TVS diode, a PNP triode, a PMOS pipe, a light-emitting diode, a resettable fuse, a gas discharge tube.

The anode of diode D1 connects the positive pole of external power supply, as the general supply input of whole circuit, the minus earth of external power supply; The negative electrode of diode D1 is connected the other end ground connection of the other end of the grounding leg of the grounding leg of the first insulating power supply DC-DC1, the second insulating power supply DC-DC2, the grounding leg of the 3rd insulating power supply DC-DC3, the first filter capacitor C1, the other end of the second filter capacitor C2, the 3rd filter capacitor C3 with the power supply input pin of the first insulating power supply DC-DC1, the power supply input pin of the second insulating power supply DC-DC2, the power supply input pin of the 3rd insulating power supply DC-DC3, the end of the first filter capacitor C1, the end of the second filter capacitor C2, the end of the 3rd filter capacitor C3; The power supply output pin of the first insulating power supply DC-DC1 is as the input VCC1 of the first insulating power supply DC-DC1, and the isolation lower margin is as the first insulating power supply DC-DC1 ground; The power supply output pin of the second insulating power supply DC-DC2 is as the input VCC2 of the second insulating power supply DC-DC2, and the isolation lower margin is as the second insulating power supply DC-DC2 ground;

The isolation lower margin of the 3rd insulating power supply DC-DC3 is as the 3rd insulating power supply DC-DC3 ground, the power supply output pin is connected with the emitter of PNP triode Q, the end of delay capacitor C4, the end of the first build-out resistor R1, the S utmost point of PMOS pipe, the collector electrode of PNP triode Q is connected with the end of the other end of the first build-out resistor R1, the second build-out resistor R2, the G utmost point of PMOS pipe, another termination the 3rd insulating power supply DC-DC3 ground of the second build-out resistor R2, the base stage of PNP triode Q is connected with the end of the other end of delay capacitor C4, the 3rd build-out resistor R3; The D utmost point of PMOS pipe is connected the other end of current-limiting resistance R4 and the anodic bonding of LED with the end of the other end of the 3rd build-out resistor R3, current-limiting resistance R4, the end of TVS diode D2, the end of resettable fuse PTC; The other end of the input termination resettable fuse PTC of gas discharge tube GDT, the output VCC3 as the 3rd insulating power supply DC-DC3 powers to external equipment; The other end of another input of gas discharge tube GDT, TVS diode D2, the negative electrode of LED connect the 3rd insulating power supply DC-DC3 ground, and the output pin of gas discharge tube GDT connects the earth.

The utility model can be realized the isolation of power supply, is embodied in safe isolation, noise isolation and ground loop isolation aspect.Avoided the interference between unlike signal, the input ground circuit of protective separation circuit is not subjected to the impact of buffer circuit circuit of output terminal fault.With short-circuit protection function, avoid increasing the reliability of system because misoperation causes the Damage by Short Circuit device or produces spark simultaneously.

Description of drawings

Fig. 1 is circuit diagram of the present utility model.

Embodiment

As shown in Figure 1, a kind of signal isolated gate insulating power supply circuit comprises three insulating power supplies, three filter capacitors, three build-out resistors, a current-limiting resistance, a delay capacitor, a TVS diode, a PNP triode, a PMOS pipe, a light-emitting diode, a resettable fuse, a gas discharge tube.

The anode of diode D1 connects the positive pole of external power supply, as the general supply input of whole circuit, the minus earth of external power supply; The negative electrode of diode D1 is connected the other end ground connection of the other end of the grounding leg of the grounding leg of the first insulating power supply DC-DC1, the second insulating power supply DC-DC2, the grounding leg of the 3rd insulating power supply DC-DC3, the first filter capacitor C1, the other end of the second filter capacitor C2, the 3rd filter capacitor C3 with the power supply input pin of the first insulating power supply DC-DC1, the power supply input pin of the second insulating power supply DC-DC2, the power supply input pin of the 3rd insulating power supply DC-DC3, the end of the first filter capacitor C1, the end of the second filter capacitor C2, the end of the 3rd filter capacitor C3; The power supply output pin of the first insulating power supply DC-DC1 is as the input VCC1 of the first insulating power supply DC-DC1, and the isolation lower margin is as the first insulating power supply DC-DC1 ground; The power supply output pin of the second insulating power supply DC-DC2 is as the input VCC2 of the second insulating power supply DC-DC2, and the isolation lower margin is as the second insulating power supply DC-DC2 ground.

The isolation lower margin of the 3rd insulating power supply DC-DC3 is as the 3rd insulating power supply DC-DC3 ground, the power supply output pin is connected with the emitter of PNP triode Q, the end of delay capacitor C4, the end of the first build-out resistor R1, the S utmost point of PMOS pipe, the collector electrode of PNP triode Q is connected with the end of the other end of the first build-out resistor R1, the second build-out resistor R2, the G utmost point of PMOS pipe, another termination the 3rd insulating power supply DC-DC3 ground of the second build-out resistor R2, the base stage of PNP triode Q is connected with the end of the other end of delay capacitor C4, the 3rd build-out resistor R3; The D utmost point of PMOS pipe is connected the other end of current-limiting resistance R4 and the anodic bonding of LED with the end of the other end of the 3rd build-out resistor R3, current-limiting resistance R4, the end of TVS diode D2, the end of resettable fuse PTC; The other end of the input termination resettable fuse PTC of gas discharge tube GDT, the output VCC3 as the 3rd insulating power supply DC-DC3 powers to external equipment; The other end of another input of gas discharge tube GDT, TVS diode D2, the negative electrode of LED connect the 3rd insulating power supply DC-DC3 ground, and the output pin of gas discharge tube GDT connects the earth.

Claims (1)

1. signal isolated gate insulating power supply circuit, comprise three insulating power supplies, three filter capacitors, three build-out resistors, a current-limiting resistance, a delay capacitor, a TVS diode, a PNP triode, a PMOS pipe, a light-emitting diode, a resettable fuse, a gas discharge tube, it is characterized in that:

The anode of diode D1 connects the positive pole of external power supply, as the general supply input of whole circuit, the minus earth of external power supply; The negative electrode of diode D1 is connected the other end ground connection of the other end of the grounding leg of the grounding leg of the first insulating power supply DC-DC1, the second insulating power supply DC-DC2, the grounding leg of the 3rd insulating power supply DC-DC3, the first filter capacitor C1, the other end of the second filter capacitor C2, the 3rd filter capacitor C3 with the power supply input pin of the first insulating power supply DC-DC1, the power supply input pin of the second insulating power supply DC-DC2, the power supply input pin of the 3rd insulating power supply DC-DC3, the end of the first filter capacitor C1, the end of the second filter capacitor C2, the end of the 3rd filter capacitor C3; The power supply output pin of the first insulating power supply DC-DC1 is as the input VCC1 of the first insulating power supply DC-DC1, and the isolation lower margin is as the first insulating power supply DC-DC1 ground; The power supply output pin of the second insulating power supply DC-DC2 is as the input VCC2 of the second insulating power supply DC-DC2, and the isolation lower margin is as the second insulating power supply DC-DC2 ground;

The isolation lower margin of the 3rd insulating power supply DC-DC3 is as the 3rd insulating power supply DC-DC3 ground, the power supply output pin is connected with the emitter of PNP triode Q, the end of delay capacitor C4, the end of the first build-out resistor R1, the S utmost point of PMOS pipe, the collector electrode of PNP triode Q is connected with the end of the other end of the first build-out resistor R1, the second build-out resistor R2, the G utmost point of PMOS pipe, another termination the 3rd insulating power supply DC-DC3 ground of the second build-out resistor R2, the base stage of PNP triode Q is connected with the end of the other end of delay capacitor C4, the 3rd build-out resistor R3; The D utmost point of PMOS pipe is connected the other end of current-limiting resistance R4 and the anodic bonding of LED with the end of the other end of the 3rd build-out resistor R3, current-limiting resistance R4, the end of TVS diode D2, the end of resettable fuse PTC; The other end of the input termination resettable fuse PTC of gas discharge tube GDT, the output VCC3 as the 3rd insulating power supply DC-DC3 powers to external equipment; The other end of another input of gas discharge tube GDT, TVS diode D2, the negative electrode of LED connect the 3rd insulating power supply DC-DC3 ground, and the output pin of gas discharge tube GDT connects the earth.

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