CN210536510U - AC/DC conversion circuit for cast explosion-proof base power supply - Google Patents
AC/DC conversion circuit for cast explosion-proof base power supply Download PDFInfo
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- CN210536510U CN210536510U CN201921619551.0U CN201921619551U CN210536510U CN 210536510 U CN210536510 U CN 210536510U CN 201921619551 U CN201921619551 U CN 201921619551U CN 210536510 U CN210536510 U CN 210536510U
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Abstract
The utility model relates to an intrinsically safe power supply device, in particular to an AC/DC conversion circuit for an encapsulated explosion-proof base power supply, which is used for converting 127V alternating current into 12V direct current voltage-stabilized output and supplying power for an intrinsically safe circuit and comprises an AC input power end, an EMI filtering loop, a rectifying and filtering circuit, a power conversion circuit, a rectifying and filtering output circuit, a voltage sampling comparison amplifying circuit and a PWM drive control unit; the EMI filter loop, the rectification filter circuit, the power conversion circuit and the rectification filter output circuit are electrically connected in sequence; the voltage sampling comparison amplifying circuit is electrically arranged behind the rectifying and filtering output circuit; the PWM driving control unit is electrically arranged behind the voltage sampling comparison amplifying circuit and in front of the power conversion circuit; the alternating current input power end is electrically connected with the EMI filtering loop.
Description
Technical Field
The utility model relates to a safe power supply unit of essence especially relates to an alternating current-direct current converting circuit that is used for explosion-proof base power of casting type.
Background
An intrinsically safe circuit refers to a circuit that does not ignite a prescribed explosive gas environment either by any spark or by any thermal effect that may be generated under the conditions prescribed by the standards, including normal operation and the fault conditions prescribed by the standards. The power supply circuit is characterized in that the interior of the power supply circuit and the outgoing line are safe in normal operation or fault state, and the generated electric spark can not ignite explosive mixtures in the surrounding environment, namely, even if the circuit is short-circuited or the electric spark occurs in use, the surrounding flammable and explosive gas can not be ignited.
As a power supply device of a communication, monitoring, detecting, alarming and control system, the intrinsic safety power supply is mainly applied to environments containing explosive mixtures, such as petroleum, chemical engineering, textile, coal mines and the like. The company carries out deep ploughing for many years in the field of design and production of the intrinsic safety power supply, and in order to meet the requirement of the 12V power supply limiting current in the explosive environment, the company carries out design and improvement on the intrinsic safety explosion-proof power supply for many years according to the technical standard specifications of national standards GB 3836-.
In order to solve the problems, firstly, an alternating current-direct current conversion circuit for an encapsulated explosion-proof base power supply for an intrinsically safe power supply device needs to be designed, and 127V alternating current is converted and input into 12V direct current stabilized voltage.
SUMMERY OF THE UTILITY MODEL
The utility model aims at designing an essence safety power supply unit's an alternating current-direct current converting circuit that is used for explosion-proof base power of casting type, be 12V direct current steady voltage with 127V alternating current conversion input.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the AC-DC conversion circuit is used for converting 127V alternating current into 12V direct current for voltage stabilization and outputting to supply power for the intrinsic safety circuit and comprises an alternating current input power end, an EMI filtering loop, a rectifying and filtering circuit, a power conversion circuit, a rectifying and filtering output circuit, a voltage sampling comparison amplification circuit and a PWM driving control unit;
the EMI filter loop, the rectification filter circuit, the power conversion circuit and the rectification filter output circuit are electrically connected in sequence;
the voltage sampling comparison amplifying circuit is electrically arranged behind the rectifying and filtering output circuit; the PWM driving control unit is electrically arranged behind the voltage sampling comparison amplifying circuit and in front of the power conversion circuit;
the alternating current input power end is electrically connected with the EMI filtering loop.
Further, the ac-dc conversion circuit further includes a delay fuse F1, a resistor R13, and a resistor R14, which are disposed between the ac input power terminal and the EMI filter loop.
Further, the EMI filter loop includes a differential mode filter composed of a temperature-controlled resistor RT1, an inductor L1, and a capacitor CX 1.
Further, the rectification filter circuit comprises a bridge rectifier diode.
Further, the rectifying and filtering circuit further comprises a polar capacitor C1, a non-polar capacitor C2 and resistors R11 and R10 which are connected in parallel.
Further, the rectification filter circuit further comprises a breakdown diode VR1 for the transient voltage suppressor, an ultrafast voltage regulator diode D1, a capacitor C3 and a resistor R2.
Further, the ac-dc conversion circuit further includes a spark energy absorption circuit, the spark energy absorption circuit is electrically connected to the rear end of the rectification filter output circuit, and the spark energy absorption circuit includes an inductor L2.
Further, the spark energy absorbing circuit further includes a diode connected in parallel with the inductor L2.
Compared with the prior art, the beneficial effects of the utility model are that: the converter is used for converting 127V alternating current into 12V direct current voltage-stabilizing output to supply power for the intrinsic safety circuit.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of the present invention;
fig. 2 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to the drawings, the embodiment provides a technical solution:
the AC-DC conversion circuit is used for converting 127V AC into 12V DC for voltage stabilization output and supplying power to the intrinsic safety circuit, and comprises an AC input power end, an EMI filtering loop, a rectifying and filtering circuit, a power conversion circuit, a rectifying and filtering output circuit, a voltage sampling comparison amplifying circuit and a PWM driving control unit; the EMI filter loop, the rectification filter circuit, the power conversion circuit and the rectification filter output circuit are electrically connected in sequence; the voltage sampling comparison amplifying circuit is electrically arranged behind the rectifying and filtering output circuit; the PWM driving control unit is electrically arranged behind the voltage sampling comparison amplifying circuit and in front of the power conversion circuit; the alternating current input power end is electrically connected with the EMI filtering loop.
The alternating current-direct current conversion circuit further comprises a delay fuse F1, a resistor R13 and a resistor R14, and the delay fuse F1, the resistor R13 and the resistor R14 are arranged between the alternating current input power supply end and the EMI filtering loop. The resistor R13 and the resistor R14 release energy on the capacitor and are used for eliminating energy charges generated on the alternating current input terminal due to internal capacitance and inductance, so that the input terminal is protected from generating electric sparks, and the input terminal is protected from generating the electric sparks.
The EMI filtering loop comprises a temperature control resistor RT1, a differential mode filter consisting of an inductor L1 and a capacitor CX 1.
The rectification filter circuit comprises a bridge rectifier diode; the circuit comprises a polar capacitor C1, a non-polar capacitor C2 and resistors R11 and R10 which are connected in parallel; the transient voltage suppressor also comprises a breakdown diode VR1 for the transient voltage suppressor, an ultrafast voltage regulator diode D1, a capacitor C3 and a resistor R2.
The alternating current-direct current conversion circuit further comprises a spark energy absorption circuit, the spark energy absorption circuit is electrically connected to the rear end of the rectification filtering output circuit, and the spark energy absorption circuit is provided with an inductor L2; further, the spark energy absorbing circuit further includes a diode connected in parallel with the inductor L2.
In the embodiment, the D5 is used for eliminating the transient high-voltage back electromotive force generated on the L3 inductor, so that the possibility of spark generation is eliminated; d7 is used for eliminating the transient high-voltage back electromotive force generated on the L2 inductor, thereby eliminating the possibility of spark generation; d6 is used for eliminating the charge energy accumulated by C7\ C8\ C9\ C10. The L2 is used as an energy storage element, and can absorb transient charge energy generated when a load is short-circuited or broken, and then the transient charge energy is released through the D7, so that the intrinsically safe circuit is safer.
As an output method of the ac/dc conversion circuit, a socket may be connected to the rear of the spark energy absorbing circuit to output a 12V dc power. Or the DC voltage stabilizing circuit can be directly connected with a lower-level circuit thereof and used as a component of a 12V DC voltage stabilizing circuit for converting 127V AC into 12V DC voltage stabilizing output to supply power for the intrinsic safety circuit.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. An AC/DC conversion circuit for a cast explosion-proof base power supply is used for converting 127V AC into 12V DC for voltage stabilization output and supplying power for an intrinsic safety circuit,
the power supply comprises an alternating current input power supply end, an EMI filtering loop, a rectifying and filtering circuit, a power conversion circuit, a rectifying and filtering output circuit, a voltage sampling comparison amplifying circuit and a PWM (pulse width modulation) driving control unit;
the EMI filter loop, the rectification filter circuit, the power conversion circuit and the rectification filter output circuit are electrically connected in sequence;
the voltage sampling comparison amplifying circuit is electrically arranged behind the rectifying and filtering output circuit; the PWM driving control unit is electrically arranged behind the voltage sampling comparison amplifying circuit and in front of the power conversion circuit;
the alternating current input power end is electrically connected with the EMI filtering loop.
2. The ac-dc converter circuit for an encapsulated explosion-proof base power supply of claim 1, further comprising a delay fuse F1, a resistor R13, and a resistor R14 disposed between said ac input power terminal and said EMI filter loop.
3. The ac-dc conversion circuit for an encapsulated explosion-proof base power supply as claimed in claim 1, wherein the EMI filter loop comprises a differential mode filter consisting of a temperature-controlled resistor RT1, an inductor L1 and a capacitor CX 1.
4. The ac-dc converter circuit for an encapsulated explosion-proof base power supply as claimed in claim 1, wherein said rectifying and filtering circuit comprises bridge rectifier diodes.
5. The AC-DC conversion circuit for an encapsulated explosion-proof base power supply as claimed in claim 4, wherein the rectifying and filtering circuit further comprises a polar capacitor C1, a non-polar capacitor C2 and resistors R11 and R10 connected in parallel.
6. The AC-DC conversion circuit for an encapsulated explosion-proof base power supply as claimed in claim 5, wherein the rectification filter circuit further comprises a breakdown diode VR1 for transient voltage suppressor and an ultrafast voltage regulator rectifier diode D1, a capacitor C3 and a resistor R2.
7. The ac-dc converter circuit for an encapsulated explosion-proof base power supply as claimed in claim 1, further comprising a spark energy absorption circuit, said spark energy absorption circuit being electrically connected to the rear end of said rectifying-filtering output circuit, said spark energy absorption circuit including an inductor L2.
8. The ac-dc converter circuit for an encapsulated explosion-proof base power supply of claim 7, wherein said spark energy absorbing circuit further comprises a diode connected in parallel with said inductor L2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921619551.0U CN210536510U (en) | 2019-09-26 | 2019-09-26 | AC/DC conversion circuit for cast explosion-proof base power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921619551.0U CN210536510U (en) | 2019-09-26 | 2019-09-26 | AC/DC conversion circuit for cast explosion-proof base power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210536510U true CN210536510U (en) | 2020-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921619551.0U Active CN210536510U (en) | 2019-09-26 | 2019-09-26 | AC/DC conversion circuit for cast explosion-proof base power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210536510U (en) |
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2019
- 2019-09-26 CN CN201921619551.0U patent/CN210536510U/en active Active
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