CN102780390B - Slowly-starting circuit for mine direct current conversion intrinsic safe power supply - Google Patents

Slowly-starting circuit for mine direct current conversion intrinsic safe power supply Download PDF

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Publication number
CN102780390B
CN102780390B CN201210255272.7A CN201210255272A CN102780390B CN 102780390 B CN102780390 B CN 102780390B CN 201210255272 A CN201210255272 A CN 201210255272A CN 102780390 B CN102780390 B CN 102780390B
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China
Prior art keywords
electric capacity
intrinsic safety
power supply
transistor q1
electric source
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CN201210255272.7A
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Chinese (zh)
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CN102780390A (en
Inventor
黎剑兵
刘彦明
谢楷
李小平
付灵忠
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西安电子科技大学
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Priority to CN201210255272.7A priority Critical patent/CN102780390B/en
Publication of CN102780390A publication Critical patent/CN102780390A/en
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Abstract

The invention relates to a slowly-starting circuit for a mine direct current conversion intrinsic safe power supply, which comprises a power input anode VIN+ and a power input cathode VIN-, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2 and a field-effect tube Q1, wherein the capacitor C1 is connected with the power input anode VIN+ and the power input cathode VIN- for filtering high-frequency interference; the resistor R1 is connected in parallel at the two ends of the capacitor C1 to form a release circuit of the capacitor C1; the resistor R2 is connected in series with the capacitor C2; the other end of the resistor R2 is connected with the power input anode VIN+; the other end of the capacitor C2 is connected with the power input cathode VIN-; a grid electrode of the field-effect tube Q1 is connected with a connecting point of the resistor R2 and the capacitor R2; a source electrode of the transistor Q1 is connected with the power input cathode VIN-; a drain electrode of the transistor Q1 is connected with ground of a rear-stage intrinsic safe power supply; and the capacitor C3 is connected in parallel at an input end of a direct current conversion intrinsic safe power supply module for storing energy. The circuit provided by the invention improves the stability of sensor devices in a mine.

Description

The soft-start circuit of mine direct current conversion intrinsic safety electric source

Technical field

The invention belongs to power technique fields, relate to the soft-start circuit of a kind of mine direct current conversion intrinsic safety electric source, be applicable to the power supply of ore deposit lower sensor network distributed system.

Background technology

At present, along with the development of national economy, distributed power supply system is widely used under ore deposit, a large amount of sensor devices is dispersed with under mine, this kind of sensor device has an independently direct current conversion intrinsic safety electric source module, for its respective sensor circuit is powered, these sensor devices are all by the large-scale intrinsic safety Power supply of on ore deposit simultaneously.

Generally, be ensure ore deposit lower sensor equipment operating voltage stable, direct current conversion intrinsic safety electric source module front end all and have jumbo electric capacity.Direct current conversion intrinsic safety electric source module itself meets intrinsic safety requirements, but in prime intrinsic safety electric source power up, each direct current conversion intrinsic safety electric source module absorbs a large amount of immediate currents simultaneously from bus, causes the misoperation of prime intrinsic safety electric source, makes sensor device cisco unity malfunction.

Summary of the invention

The object of the invention is to, for mine direct current conversion intrinsic safety electric source module provides a kind of mine direct current to change the soft-start circuit of intrinsic safety electric source, to reduce to power on constantly, from the immediate current of the absorption of prime intrinsic safety electric source, improve the stability of ore deposit lower sensor equipment.

For achieving the above object, technical scheme provided by the invention is as follows: a kind of soft-start circuit of mine direct current conversion intrinsic safety electric source, it is characterized in that: comprise power supply input positive pole VIN+ and power supply input negative pole VIN-, electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2 and field effect transistor Q1, wherein said electric capacity C1 is connected to input positive pole VIN+ and the power supply input negative pole VIN-of power supply, plays the effect of filtering High-frequency Interference; Described resistance R1 is connected in parallel on electric capacity C1 two ends, forms the bleed off loop of electric capacity C1; Described resistance R2 and electric capacity C2 connects, and the other end of resistance R2 connects the input positive pole VIN+ of power supply, and the other end of electric capacity C2 connects power supply input negative pole VIN-; The grid of described field effect transistor Q1 is connected with the tie point of resistance R2 and electric capacity C2, and the source electrode of transistor Q1 connects power supply input negative pole VIN-, and the drain electrode of transistor Q1 connects the ground GND of rear class intrinsic safety electric source; Described electric capacity C3 is connected in parallel on the input of direct current conversion intrinsic safety electric source module, plays energy storage effect.

The soft-start circuit of described mine direct current conversion intrinsic safety electric source also comprises diode D1, and the negative electrode of diode D1 is connected to the input positive pole VIN+ of power supply, and diode D1 anode connects the grid of field effect transistor Q1.

The soft-start circuit of described mine direct current conversion intrinsic safety electric source also comprises diode D2, diode D2 is connected between the input positive pole VIN+ of power supply and the electrode input end VCC of rear class this case power module, wherein the negative electrode of diode D2 is connected to the electrode input end VCC of rear class this case power module, and diode D2 anode connects the input positive pole VIN+ of power supply.

The Standard resistance range of described resistance R2 is between 100K to 1M, and the capacitance value range of electric capacity C2 is between 1uF to 10uF.

The present invention has the following advantages compared to existing technology tool:

1, during owing to powering on, field effect transistor Q1 is in off state, electric capacity C2 is charged by resistance R2, when the voltage of electric capacity C2 reaches cut-in voltage Vgs (th) of field effect transistor Q1, field effect transistor Q1 just starts conducting, therefore direct current conversion intrinsic safety electric source module delays a period of time starts to power on, ensure that direct current conversion intrinsic safety electric source module just powers on after prime intrinsic safety electric source voltage has been set up, therefore the immediate current needed for sensor device can be improved jointly by prime intrinsic safety electric source and storage capacitor, from the size of the impulse current of prime intrinsic safety electric source absorption during to reduce to power on,

2, along with the slow rising of the voltage Vgs between field effect transistor Q1 grid and source electrode, the electric current that powers on also slowly raises until the storage capacitor before direct current conversion intrinsic safety electric source module is full of, and decreases peak current required in power up;

3, due to resistance R2 during assembling and electric capacity C2 random combine, the power-on delay time of direct current conversion intrinsic safety electric source module is not identical, and therefore staggered the power-on time of each direct current conversion intrinsic safety electric source module, reduces the impact to prime intrinsic safety electric source further.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described:

Fig. 1 is the soft-start circuit of mine direct current conversion intrinsic safety electric source.

Embodiment

Embodiment 1

A kind of soft-start circuit of mine direct current conversion intrinsic safety electric source, comprise power supply input positive pole VIN+ and power supply input negative pole VIN-, electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2 and field effect transistor Q1, wherein said electric capacity C1 is connected to input positive pole VIN+ and the power supply input negative pole VIN-of power supply, plays the effect of filtering High-frequency Interference; Described resistance R1 is connected in parallel on electric capacity C1 two ends, forms the bleed off loop of electric capacity C1; Described resistance R2 and electric capacity C2 connects, and the other end of resistance R2 connects the input positive pole VIN+ of power supply, and the other end of electric capacity C2 connects power supply input negative pole VIN-; The grid of described field effect transistor Q1 is connected with the tie point of resistance R2 and electric capacity C2, and the source electrode of transistor Q1 connects power supply input negative pole VIN-, and the drain electrode of transistor Q1 connects the ground GND of rear class intrinsic safety electric source; Described electric capacity C3 is connected in parallel on the input of direct current conversion intrinsic safety electric source module, plays energy storage effect.

Embodiment 2

Adopt the soft-start circuit of mine direct current conversion intrinsic safety electric source of the present invention as shown in Figure 1.This circuit comprises input positive pole VIN+ and the power supply input negative pole VIN-that the wherein said electric capacity C1 of electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, field effect transistor Q1, diode D1 and diode D2 is connected to power supply, plays the effect of filtering High-frequency Interference; Described resistance R1 is connected in parallel on electric capacity C1 two ends, forms the bleed off loop of electric capacity C1; Described resistance R2 and electric capacity C2 connects, and the other end of resistance R2 connects the input positive pole VIN+ of power supply, and the other end of electric capacity C2 connects power supply input negative pole VIN-; The grid of described field effect transistor Q1 is connected with the tie point of resistance R2 and electric capacity C2, and the source electrode of field effect transistor Q1 connects power supply input negative pole VIN-, and the drain electrode of field effect transistor Q1 connects the ground GND of rear class intrinsic safety electric source; Described electric capacity C3 is connected in parallel on the input of rear class intrinsic safety electric source module, plays energy storage effect; The negative electrode of described diode D1 is connected to the input positive pole VIN+ of power supply, and diode D1 anode connects the grid of field effect transistor Q1; Described diode D2 is connected between the input positive pole VIN+ of power supply and the electrode input end VCC of rear class this case power module, wherein the negative electrode of diode D2 is connected to the electrode input end VCC of rear class this case power module, and diode D2 anode connects the input positive pole VIN+ of power supply; Described field effect transistor Q1 is mos field effect transistor.

Operation principle of the present invention is as follows:

When prime intrinsic safety electric source powers on, field effect transistor Q1 is in off state, voltage on power line is first by described electric capacity C1 filtering, High-frequency Interference on filter out power line, power supply is charged to electric capacity C2 by described resistance R2 simultaneously, when the voltage rise on electric capacity C2 is to cut-in voltage Vgs (th) of field effect transistor Q1, field effect transistor Q1 starts conducting, and the computational methods of conducting required time Ton are: Ton=R2*C2*ln(VIN/(VIN-Vgs (th))); After field effect transistor Q1 conducting, storage capacitor C3 before sensor device is communicated with the intrinsic safety electric source of prime with diode D2 by field effect transistor Q1, along with the voltage at electric capacity C2 two ends raises gradually, the impedance of field effect transistor Q1 gradually becomes Low ESR from high impedance, until the complete conducting of field effect transistor Q1.Due to the delayed action of resistance R2 and electric capacity C2, ensure that in the process of field effect transistor Q1 conducting, prime intrinsic safety electric source is set up completely, the charging current of electric capacity C2 can be provided jointly by the intrinsic safety electric source of prime and storage capacitor, impact to this case power supply when decreasing start, ensure that the normal work of prime intrinsic safety electric source and the normal foundation of sensor device voltage.After the Voltage Establishment of sensor device occurs in prime prime intrinsic safety electric source Voltage Establishment, therefore this circuit plays the effect of delay startup.

When prime intrinsic safety electric source turns off output, electric capacity C2, diode D1 and resistance R1 form a closed-loop path, electric capacity C2 is discharged by diode D1 and resistance R1, when cut-in voltage lower than field effect transistor Q1 of the voltage at electric capacity C2 two ends, transistor turns off, and the Time Calculation needed for shutoff is as follows: Toff=R1*C2*ln(Vgs (th)/VIN); It is less that bleed off resistance R1 gets, can ensure intrinsic safety electric source turn off export time, field effect transistor Q1 turns off fast, soft-start circuit Rapid reset, upper once intrinsic safety electric source powers on time, this circuit continues the effect playing delay startup.

When prime intrinsic safety electric source generation Voltage Drop, due to the effect of diode D2, storage capacitor C3 in sensor device can not to prime reverse irrigated current, the sensor device required voltage that normally works can be maintained by storage capacitor C3, if the overlong time of Voltage Drop, under the effect of resistance R2 and electric capacity C2, when the voltage drop on storage capacitor C3 is to certain degree, this control circuit can automatically shut down field effect transistor Q1, ensure that the delay startup of sensor device after long-time Voltage Drop occurs prime intrinsic safety electric source.

The parts that the present embodiment does not describe in detail and structure belong to the well-known components of the industry and common structure or conventional means, do not describe one by one here.

Claims (4)

1. the soft-start circuit of mine direct current conversion intrinsic safety electric source, it is characterized in that: comprise power supply input positive pole VIN+ and power supply input negative pole VIN-, electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2 and field effect transistor Q1, wherein said electric capacity C1 is connected to input positive pole VIN+ and the power supply input negative pole VIN-of power supply, plays the effect of filtering High-frequency Interference; Described resistance R1 is connected in parallel on electric capacity C1 two ends, forms the bleed off loop of electric capacity C1; Described resistance R2 and electric capacity C2 connects, and the other end of resistance R2 connects the input positive pole VIN+ of power supply, and the other end of electric capacity C2 connects power supply input negative pole VIN-; The grid of described field effect transistor Q1 is connected with the tie point of resistance R2 and electric capacity C2, and the source electrode of transistor Q1 connects power supply input negative pole VIN-, and the drain electrode of transistor Q1 connects the ground GND of rear class intrinsic safety electric source; Described electric capacity C3 is connected in parallel on the input of direct current conversion intrinsic safety electric source module, plays energy storage effect;
Its operation principle is as follows:
When prime intrinsic safety electric source powers on, field effect transistor Q1 is in off state, voltage on power line is first by described electric capacity C1 filtering, High-frequency Interference on filter out power line, power supply is charged to electric capacity C2 by described resistance R2 simultaneously, when the voltage rise on electric capacity C2 is to the cut-in voltage Vgs of field effect transistor Q1, field effect transistor Q1 starts conducting; After field effect transistor Q1 conducting, storage capacitor C3 before sensor device is communicated with the intrinsic safety electric source of prime with diode D2 by field effect transistor Q1, along with the voltage at electric capacity C2 two ends raises gradually, the impedance of field effect transistor Q1 gradually becomes Low ESR from high impedance, until the complete conducting of field effect transistor Q1; Due to the delayed action of resistance R2 and electric capacity C2, ensure that in the process of field effect transistor Q1 conducting, prime intrinsic safety electric source is set up completely, the charging current of electric capacity C2 can be provided jointly by the intrinsic safety electric source of prime and storage capacitor, impact to this case power supply when decreasing start, ensure that the normal work of prime intrinsic safety electric source and the normal foundation of sensor device voltage; After the Voltage Establishment of sensor device occurs in prime prime intrinsic safety electric source Voltage Establishment, therefore this circuit plays the effect of delay startup;
When prime intrinsic safety electric source turn off export time, electric capacity C2, diode D1 and resistance R1 form a closed-loop path, and electric capacity C2 discharge by diode D1 and resistance R1, when cut-in voltage lower than field effect transistor Q1 of the voltage at electric capacity C2 two ends, transistor shutoff; It is less that bleed off resistance R1 gets, can ensure intrinsic safety electric source turn off export time, field effect transistor Q1 turns off fast, soft-start circuit Rapid reset, upper once intrinsic safety electric source powers on time, this circuit continues the effect playing delay startup;
When prime intrinsic safety electric source generation Voltage Drop, due to the effect of diode D2, storage capacitor C3 in sensor device can not to prime reverse irrigated current, the sensor device required voltage that normally works can be maintained by storage capacitor C3, if the overlong time of Voltage Drop, under the effect of resistance R2 and electric capacity C2, when the voltage drop on storage capacitor C3 is to certain degree, this circuit can automatically shut down field effect transistor Q1, ensure that the delay startup of sensor device after long-time Voltage Drop occurs prime intrinsic safety electric source.
2. the soft-start circuit of mine direct current conversion intrinsic safety electric source according to claim 1, it is characterized in that: the soft-start circuit of described mine direct current conversion intrinsic safety electric source also comprises diode D1, the negative electrode of diode D1 is connected to the input positive pole VIN+ of power supply, and diode D1 anode connects the grid of field effect transistor Q1.
3. the soft-start circuit of mine direct current conversion intrinsic safety electric source according to claim 1, it is characterized in that: the soft-start circuit of described mine direct current conversion intrinsic safety electric source also comprises diode D2, diode D2 is connected between the input positive pole VIN+ of power supply and the electrode input end VCC of rear class this case power module, wherein the negative electrode of diode D2 is connected to the electrode input end VCC of rear class this case power module, and diode D2 anode connects the input positive pole VIN+ of power supply.
4. the soft-start circuit of mine direct current conversion intrinsic safety electric source according to claim 1, is characterized in that: the Standard resistance range of described resistance R2 is between 100K to 1M, and the capacitance value range of electric capacity C2 is between 1uF to 10uF.
CN201210255272.7A 2012-07-23 2012-07-23 Slowly-starting circuit for mine direct current conversion intrinsic safe power supply CN102780390B (en)

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CN106685192A (en) * 2016-12-02 2017-05-17 盛科网络(苏州)有限公司 Power supply circuit of switch system

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Publication number Priority date Publication date Assignee Title
CN201181903Y (en) * 2008-04-01 2009-01-14 中兴通讯股份有限公司 Input circuit of DC power supply

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201181903Y (en) * 2008-04-01 2009-01-14 中兴通讯股份有限公司 Input circuit of DC power supply

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