CN100394344C - Output power constant high-voltage high-power barrier - Google Patents
Output power constant high-voltage high-power barrier Download PDFInfo
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Abstract
The present invention relates to an output power constant high-voltage high-power barrier which is characterized in that the present invention is formed by connecting an input filtering circuit 1, a rectification filtering circuit 2 and an energy limiting circuit 3 in sequence; the power limiting circuit is composed of a catching circuit 3-1, a power switch circuit 3-2, a current detection circuit 3-3, a constant current source circuit 3-4, a shunt circuit 3-5 and an input voltage detecting and constant power output control circuit 3-6. The high-voltage high-power barrier is mainly used in monitoring and supervising systems of dangerous environment, such as coal mines, petrifaction, etc., and is particularly used in explosion proof power supplies and essential safe stabilized voltage supplies. The present invention effectively reduces energy from short-circuit spark faults of the dangerous environment, and ensures that electronic equipment and D. C. stabilized voltage supplies can be safely applied to the dangerous environment; the output power of the essential safe or explosion proof D. C. stabilized voltage supplies can be large, the efficiency of power supplies can not be reduced, and a circuit structure and a control method are simple.
Description
Technical field
The invention belongs to a kind of electronic product, it is mainly used in risk environments such as colliery, oil, chemical industry, exactly is a kind of associate device that is used to connect intrinsically safe power supply or electronic product and non-intrinsic safety equipment.
Background technology
The essential safe type Switching Power Supply is the important component part of electronic equipment, in the essential safe type AC/DC of the electrical apparatus for explosive atmospheres that works in hazardous environment Switching Power Supply, owing to be input as low frequency (50Hz), in order to reach enough big output power, usually the filter capacitor that partly needs larger capacity in the filtering of Switching Power Supply input rectifying, and voltage is up to several hectovolts, in a single day so faults such as short circuit occur, the electric spark of its generation will inevitably be ignited inflammable, explosion hazard gases, obviously can not satisfy essential safety or requirement of explosion proof.Therefore, for essential safe type Switching Power Supply or other electronic product are applied in the dangerous type environment safely, just must introduce high-power isolation safe grid in the importation of power supply or electronic product, with the fault energy limited such as short circuit of importation in enough low scope.Existing safety barrier adopts resistance current limliting and stabilivolt or transistor pressure limiting usually, limit maximum current and ceiling voltage, to reach the purpose of restriction energy, and can not thoroughly turn-off the power supply energy of input, therefore loss is big, electric current is little, can only be applied in low pressure, miniwatt occasion, be unfavorable for the transmission of high-power electric energy.Given this, just can't make the explosion-proof type direct supply that is applied to hazardous environment realize complete essential safety, and belong to Flameproof and intrinsically safe, the outside is added with heavy flameproof enclosure.So, for the explosion-proof direct supply of realizing intrinsic safety type just needs normal transmission that neither influences high-power electric energy of design, again can be with the high-power safety barrier of fault energy limited in an enough little scope, to satisfy the requirement of explosion proof of hazardous environment to electrical equipment.According to statistics, the all types of collieries of China have 2.6 ten thousand approximately at present, more than 3000 in wherein large and medium-sized colliery, key issue is extensively not adopt monitoring, supervisory system, there are a lot of potential safety hazards, and the Switching Power Supply that each is monitored, supervisory system needs a playscript with stage directions matter safety-type at least, therefore, the high-power safety barrier that designs the intrinsic safety type Switching Power Supply that is applicable to risk environment is significant.
Summary of the invention
The objective of the invention is in order to solve problems of the prior art, a kind of high-power safety barrier of permanent power output is provided, it is serially connected between non-intrinsic safety equipment and intrinsically safe power supply or other electronic product, to guarantee the normal operation of high-power equipment.
The present invention realizes with following technical proposal: the high-power safety barrier of this perseverance power output is made up of input filter circuit, current rectifying and wave filtering circuit and energy limited circuit three parts.That is to say that the output of input filter circuit is connected to the input of current rectifying and wave filtering circuit, the output of current rectifying and wave filtering circuit is connected to the input of energy limited circuit.Energy limited circuit is wherein detected by clamped circuit, power switch circuit, current detection circuit, constant-current source circuit, divided circuit and input voltage and permanent power output control circuit six parts are formed: the input of clamped circuit, power switch circuit, constant-current source circuit and input voltage detection and permanent power output control circuit connects the output of current rectifying and wave filtering circuit respectively; The input of current detection circuit is received in the output of power switch circuit, the control end of power switch circuit and the input end of divided circuit are received in the output of constant-current source circuit respectively, and the control end of divided circuit is received in the output of input voltage detection and permanent power output control circuit; The output that energy limited circuit is all received in the output of affiliated clamped circuit, current detection circuit and divided circuit.
The present invention has limited the fault energy such as short circuit from input or electrical network effectively, guarantees that the intrinsically safe power supply or other electronic product that join with high pressure or electrical network can be applied to risk environment safely; The output power of intrinsically safe power supply can be done more, and can not reduce the efficient of power supply or electronic product; Do not need flameproof enclosure the external of intrinsic safety type power supply, so thermal diffusivity is good, weight of equipment does not increase, and has reduced equipment cost simultaneously.
Description of drawings
Fig. 1 is the high-power safety barrier schematic circuit block diagram of permanent power output.
Fig. 2 is the energy limited circuit theory diagram among Fig. 1.
Fig. 3 is the high-power safety barrier embodiment one circuit working schematic diagram of permanent power output.
Fig. 4 is the high-power safety barrier embodiment two circuit working schematic diagrams of permanent power output.
Embodiment
In conjunction with the accompanying drawings one-piece construction of the present invention and principle of work thereof are done concrete detailed explanation:
As shown in Figure 1, the high-power safety barrier of this permanent power output is to be connected to form successively by input filter circuit, current rectifying and wave filtering circuit and energy limited circuit three parts.As shown in Figure 2: energy limited circuit is wherein detected by clamped circuit, power switch circuit, current detection circuit, constant-current source circuit, divided circuit and input voltage and permanent power output control circuit six parts are formed: the input of clamped circuit, power switch circuit, constant-current source circuit and input voltage detection and permanent power output control circuit connects the output of current rectifying and wave filtering circuit respectively; The input of current detection circuit is received in the output of power switch circuit, the control end of power switch circuit and the input end of divided circuit are received in the output of constant-current source circuit respectively, and the control end of divided circuit is received in the output of input voltage detection and permanent power output control circuit; The output that energy limited circuit is all received in the output of affiliated clamped circuit, current detection circuit and divided circuit.Shown in Fig. 3,4, circuit of the present invention input has three terminal A, B and GND during practical application, and A and B connect the two ends of input ac voltage respectively, meet sb. at the airport shell or greatly of GND; Output has two each and every one terminal Vo+ and Vo-, is respectively the anode and the negative terminal of output dc voltage.Its principle of work is: the line voltage of input (as alternating current 220V), high-frequency interferencing signal through input filter circuit filtering input, input filter circuit can also limit the energising surge current of moment, then, enter current rectifying and wave filtering circuit and carry out rectifying and wave-filtering, change alternating voltage into level and smooth DC voltage, be input to energy limited circuit again.The power switch circuit conducting of energy limited circuit has only very little conduction loss during operate as normal.Current detection circuit judges by detecting electric current whether output overcurrent or short trouble take place; The maximum drive current of constant-current source circuit decision power switch circuit; When current detection circuit detects electric current in the circuit and surpasses a certain setting value, judge overcurrent or short trouble take place; The making the divided circuit conducting of overcurrent or short trouble and shunting, the drive current that then flows through power switch circuit reduces immediately, output voltage begins to descend, this electric current that makes divided circuit flow through is bigger, the drive current of power switch circuit is littler, output voltage continues to descend, form a strong positive feedback process so like this, end until power switch circuit, finally make output voltage and output current all approach zero, therefore, when short trouble takes place, output terminal short trouble and the spark energy that produces reaches effective inhibition.Input voltage detects and the principle of permanent power output control circuit is: in fact this partial circuit is equivalent to a thyrite, and the high equivalent resistance of input voltage is big, and the basic dividing potential drop on VT5 is just high, and VT5 is conducting easily just, and the output current of allowing is just little; Otherwise the output current of then allowing is just big, and this just guarantees that in the input voltage range that allows it is constant that output power keeps, and promptly the output current that allows when input voltage is low is big, and input voltage when high the output current of permission little.
Fig. 3 provides embodiments of the invention one, wherein said input filter circuit is by protective tube FU1, differential mode filter capacitor CX1 and CX2, common mode filtering capacitor C Y1 and CY2, common mode inductance L1, voltage dependent resistor (VDR) RV1, thermistor RT1 and the safe discharge resistance RX1 of input constitute, its connected mode is: the termination input end A of protective tube FU1, the input end of another termination differential mode filter capacitor CX1 and common mode inductance L1, meet another input end B behind another input end short circuit of the other end of CX1 and L1, two output terminals of common mode inductance L1 are received differential mode filter capacitor CX2 respectively, two ends after voltage dependent resistor (VDR) RV1 and the safe discharge resistance RX1 of the input parallel connection, one of them of these two ends received the GND end by common mode filtering capacitor C Y1, and, receive an input end of current rectifying and wave filtering circuit by being an output terminal of input filter circuit behind the thermistor RT1; Second end at these two ends is received GND end by common mode capacitance CY2, and as another output terminal of input filter circuit, receives another input end of current rectifying and wave filtering circuit.Described current rectifying and wave filtering circuit is made of rectifier bridge BG1 and filter capacitor CX3, its connected mode is: two output terminals of input filter circuit, receive two input ends of rectifier bridge BG1 respectively, the output plus terminal of rectifier bridge BG1 meets "+" end of filter capacitor CX3, i.e. Vin+; The output negative terminal of rectifier bridge BG1 meets "-" end of filter capacitor CX3, i.e. Vin-.Clamped circuit in the described energy limited circuit is made of diode D5 (as FR207), and its connected mode is: negative electrode meets the output plus terminal Vin+ of current rectifying and wave filtering circuit, and anode meets output voltage anode Vo+ of the present invention.Power switch circuit in the described energy limited circuit is made of pliotron VT1, VT1 can be pliotron (as 2SC2625) or Darlington pliotron (as BU941), its connected mode is: the collector of VT1 meets the output plus terminal Vin+ of current rectifying and wave filtering circuit, emitter is received current detection circuit, and base stage connects the output of constant-current source circuit-be the collector of triode VT2.Described current detection circuit is to be connected in series with current sampling resistor R12 by diode D3 to constitute, and its connected mode is: the termination power switch circuit that D3 (left end is an anode, and right-hand member is a negative electrode) is connected in series with R12, the anode Vo+ of another termination output voltage.Described constant-current source circuit is by resistance R 10 and R11, diode D1 and D2 and triode VT2 constitute, its connected mode is: diode D1 and D2 series connection, the anode of series connection meets the output plus terminal Vin+ of current rectifying and wave filtering circuit, the end of the negative electrode difference connecting resistance R10 of series connection and the base stage of triode VT2, the output negative terminal Vin-of another termination current rectifying and wave filtering circuit of R10, the emitter of triode VT2 is received the output plus terminal Vin+ of current rectifying and wave filtering circuit by resistance R 11, and the collector of triode VT2 is received the base stage of pliotron VT1 respectively, the collector of the triode VT5 of divided circuit and the anode of diode D4.Described divided circuit is to be made of resistance R 13, diode D4 and triode VT5, its connected mode is: (left end is an anode to diode D4, right-hand member is a negative electrode) base stage that terminates to triode VT5 of connecting with resistance R 13, the other end is received the collector of triode VT5, and the emitter of triode VT5 meets output voltage anode Vo+ of the present invention.Described input voltage detects and permanent power output control circuit is by sample resistance R2 and R3, voltage stabilizing diode ZD1, resistance R 4～R9 and R1, R14 and the two poles of the earth amplifying circuit of being made up of triode VT3 and VT4 are constituted, its connected mode is: the output plus terminal Vin+ of the termination current rectifying and wave filtering circuit of sample resistance R2, the output negative terminal Vin-of the termination current rectifying and wave filtering circuit of sample resistance R3, the tie point of R2 and R3 series connection meets voltage stabilizing diode ZD1, and (left end is a negative electrode, right-hand member is an anode) end of connecting with resistance R 4, the other end that ZD1 connects with R4 is received the base stage of triode VT3 and the end of R5, the emitter of the other end of R5 and triode VT3 meets the output negative terminal Vin-of current rectifying and wave filtering circuit, the collector of VT3 is received the tie point of resistance R 1 and R6, the output plus terminal Vin+ of another termination current rectifying and wave filtering circuit of R1, the other end of R6 is received an end of base stage and the resistance R 7 of triode VT4 respectively, the emitter of the other end of R7 and triode VT4 meets the output negative terminal Vin-of current rectifying and wave filtering circuit, the collector of VT4 is received an end of resistance R 8, the other end connecting resistance R14 of R8 and the tie point of R9, and this tie point is also received the base stage of triode VT5 in the divided circuit, and the other end of resistance R 14 and R9 meets the output plus terminal Vin+ of current rectifying and wave filtering circuit respectively, negative terminal Vin-.
Its principle of work is: the line voltage of input (as alternating current 220V), high-frequency interferencing signal through input filter circuit filtering input, input filter circuit can also limit the surge current of powered on moment, then, enter current rectifying and wave filtering circuit and carry out rectifying and wave-filtering, change alternating voltage into level and smooth DC voltage, be input to energy limited circuit again, the spark energy that the output short-circuit fault can be produced by energy limited circuit is restricted in the enough little scope.The principle of work of energy limited circuit is: resistance R 12 is output current sample resistances, in the running current scope, the pressure drop that output current produces on sample resistance R12 is less, triode VT5 is in off state, with triode VT2 is that the constant-current source circuit that core constitutes provides drive current to the pliotron of power switch circuit, and pliotron VT1 is in the saturation conduction state; Take place or output current is excessive when surpassing setting value as short trouble, the pressure drop that output current produces on sample resistance R12 makes triode VT5 conducting, will be to electric current shunting from constant current source, owing to fix from the maximum drive current of constant-current source circuit, therefore the base drive electric current of pliotron VT1 will reduce, so output voltage just begins to descend, this electric current that makes divided circuit flow through is bigger, the drive current of switching tube is littler, output voltage continues to descend, just form a strong positive feedback process so like this, the result of positive feedback makes the triode VT5 of divided circuit progress into cut-off state by pliotron VT1 when changing saturation conduction over to gradually by saturation conduction, finally make output voltage and output current all approach zero, therefore, when short trouble took place, the spark energy that output terminal produces because of short trouble reached effective inhibition.
Input voltage detects and the effect of permanent power output control circuit is, guarantees in the input voltage range that allows, and it is constant that output power keeps, and promptly the output current of permission is big when input voltage is low, and input voltage when high the output current of permission little.Its principle of work is: can the triode VT5 of divided circuit conducting depend on the voltage of its emitter junction-be the potential difference (PD) of base stage and emitter, its emitter current potential just equals output voltage, after its base potential is then passed through diode D4 and resistance R 13 by the base potential of VT1, dividing potential drop decision on the equivalent resistance of determining by permanent power circuit (when supposing that VT5 ends), and the equivalent resistance of permanent power circuit is controlled by input voltage.As when input voltage increases, the collector potential of triode VT3 reduces, thereby the collector potential of triode VT4 is raise, the equivalent resistance that is equivalent to constant-power control circuit increases, and makes that the base potential of VT5 is relatively just higher, therefore goes up pressure drop when hanging down as sample resistance R12, just can make the VT5 conducting, VT5 one conducting entire circuit enters positive feedback immediately, and pliotron VT1 will end very soon, so allow the output current of circuit just little.Same reason, when input voltage reduced, the output current of permission was just big.Finally, realized the permanent power output of circuit.Regulate resistance R 14 and R9 and the sample resistance R12 scalable output power in the input voltage range that allows.
Fig. 4 has provided embodiments of the invention two, and wherein the power transistor VT1 of power switch circuit adopts the Darlington that two triodes constitute, and current detection circuit only is made of resistance R 12, and remainder is identical with embodiment one appropriate section.Its principle of work and embodiment one are identical.
Among the above-described figure, input filter circuit also has other a lot of forms, can realize the scheme of current detecting and shunting and realize that output power is regulated or constant circuit also has a lot.But take all factors into consideration, listed examples is a preferred version.
Claims (6)
1. the high-power safety barrier of a permanent power output, it comprises input filter circuit (1), current rectifying and wave filtering circuit (2), it is characterized in that output terminal at current rectifying and wave filtering circuit is provided with energy limited circuit (3) and connects to form successively, wherein energy limited circuit (3) is by clamped circuit (3-1), power switch circuit (3-2), current detection circuit (3-3), constant-current source circuit (3-4), divided circuit (3-5) and input voltage detect and permanent power output control circuit (3-6) constitutes: clamped circuit (3-1), power switch circuit (3-2), the input of constant-current source circuit (3-4) and input voltage detection and permanent power output control circuit (3-6) connects the output of current rectifying and wave filtering circuit respectively; The input that current detection circuit (3-3) received in the output of power switch circuit (3-2), the control end of power switch circuit (3-2) and the input end of divided circuit (3-5) are received in the output of constant-current source circuit (3-4) respectively, and the control end of divided circuit (3-5) is received in the output of input voltage detection and permanent power output control circuit (3-6); The output that energy limited circuit is all received in the output of described clamped circuit (3-1), current detection circuit (3-3) and divided circuit (3-5); Described divided circuit (3-5) is to be made of resistance R 13, diode D4 and triode VT5, diode D4 negative electrode and the base stage of receiving triode VT5 after resistance R 13 is connected, anode connects the collector of triode VT5, and the emitter of triode VT5 connects the anode of output voltage.
2. the high-power safety barrier of permanent power output according to claim 1 is characterized in that the clamped circuit (3-1) of energy limited circuit (3) is to be made of diode D5.
3. the high-power safety barrier of permanent power output according to claim 1 is characterized in that the power switch circuit (3-2) of energy limited circuit (3) is to be made of pliotron VT1 or compound transistor.
4. the high-power safety barrier of permanent power output according to claim 1, the current detection circuit (3-3) that it is characterized in that energy limited circuit (3) is to be connected in series with current sampling resistor R12 by diode D3 to constitute; Perhaps only constitute by current sampling resistor R12.
5. the high-power safety barrier of permanent power output according to claim 1, the constant-current source circuit (3-4) that it is characterized in that energy limited circuit (3) is to be made of triode VT2, resistance R 11 and R10, diode D1 and D2, current control resistor R11 is connected on the emitter of triode VT2, diode D1 and D2 connect successively with resistance R 10, and diode D2 and the contact of connecting of resistance R 10 are received the base stage of triode VT2.
6. the high-power safety barrier of permanent power output according to claim 1, the input voltage detection and the permanent power output control circuit (3-6) that it is characterized in that energy limited circuit (3) are by sample resistance R2 and R3, voltage stabilizing diode ZD1 reaches by resistance R 1, R4, the one-level amplifying circuit that R5 and triode VT3 form and by resistance R 6～R9, the second level amplifying circuit that R14 and triode VT4 form be connected successively constitute, the series connection contact of sample resistance R2 and R3 is connected on the voltage stabilizing diode ZD1 negative electrode, the anode of voltage stabilizing diode ZD1 with receive on the base stage of triode VT3 after resistance R 4 is connected, resistance R 5 is attempted by between the base stage and emitter of triode VT3, receive on the base stage of triode VT4 after resistance R 1 and the R6 series connection, and the series connection contact of resistance R 1 and R6 is connected on the collector of triode VT3, resistance R 7 is attempted by between the base stage and emitter of triode VT4, the contact of resistance R 14 and R9 series connection is connected to by resistance R 8 on the collector of triode VT4, and the emitter of triode VT3 and VT4 connects the negative terminal of output voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100430763A CN100394344C (en) | 2005-08-09 | 2005-08-09 | Output power constant high-voltage high-power barrier |
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| CNB2005100430763A CN100394344C (en) | 2005-08-09 | 2005-08-09 | Output power constant high-voltage high-power barrier |
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| CN100394344C true CN100394344C (en) | 2008-06-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101776931B (en) * | 2009-12-18 | 2013-10-30 | 云南大学 | Low power consumption power supply circuit of meter bus slave computer |
| CN102594175B (en) * | 2012-03-06 | 2014-06-25 | 广州金升阳科技有限公司 | Alternating current-to-direct current circuit |
| CN103928911B (en) * | 2014-04-25 | 2016-12-21 | 西安科技大学 | The short circuited inductance energy-bypass system circuit of intrinsic safety Boost |
| CN105552868B (en) * | 2016-01-29 | 2019-03-08 | 中国电子科技集团公司第二十三研究所 | Current foldback circuit and its control method based on constant current-supplying mode |
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| JP2000184702A (en) * | 1998-12-18 | 2000-06-30 | Toko Inc | Power supply |
| US20040201937A1 (en) * | 2003-04-08 | 2004-10-14 | Katsuyuki Yoshida | Overcurrent protection circuit for switching power supply |
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2005
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2074509U (en) * | 1990-08-11 | 1991-04-03 | 肖公亮 | Safety accumulator |
| JP2000184702A (en) * | 1998-12-18 | 2000-06-30 | Toko Inc | Power supply |
| US20040201937A1 (en) * | 2003-04-08 | 2004-10-14 | Katsuyuki Yoshida | Overcurrent protection circuit for switching power supply |
| CN2870262Y (en) * | 2005-08-09 | 2007-02-14 | 刘树林 | High-pressure high-power safety grid of constant power output |
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| 采用MOSFET的高速截流开关. 王旭光，肖海荣.工矿自动化，第1期. 2005 |
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Address after: 518075 Guangdong city of Shenzhen province Nanshan District high tech Zone nine new South Road No. 9, new software park building 8 floor 701-712 room 7 Patentee after: Shenzhen Jinhongwei Technology Co.,Ltd. Address before: 518075 Guangdong city of Shenzhen province Nanshan District high tech Zone nine new South Road No. 9, new software park building 8 floor 701-712 room 7 Patentee before: Shenzhen Golden Highway Industry Development Co., Ltd. |
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