CN103795281A - Wide voltage input type high-power intrinsic safety power source - Google Patents
Wide voltage input type high-power intrinsic safety power source Download PDFInfo
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- CN103795281A CN103795281A CN201410066624.3A CN201410066624A CN103795281A CN 103795281 A CN103795281 A CN 103795281A CN 201410066624 A CN201410066624 A CN 201410066624A CN 103795281 A CN103795281 A CN 103795281A
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Abstract
The invention discloses a wide voltage input type high-power intrinsic safety power source which comprises an EMI filter circuit (1) connected with alternating currents. The EMI filter circuit (1) is sequentially connected with a rectifying circuit (2), a high-frequency transformer (4), a voltage stabilizing filter circuit (5) and an over-voltage and over-current protection circuit (6) outside. The intrinsic safety power source further comprises a PWM control chip (7) and an MCU module (8), wherein the on-off frequency of a connected first MOS switch tube is controlled through the PWM control chip so that the voltage frequency exerted on a primary level of the high-frequency transformer can be changed and constant output of a secondary level of the high-frequency transformer can be guaranteed, a relay (K1) is connected to the periphery of the MCU module (8), contactors of the relay are controlled to form a voltage doubling rectifying circuit through the rectifying circuit and a filtering capacitor (3) according to the requirement, so that when the alternating current input voltage is low, it is guaranteed that the primary level of the high-frequency transformer can obtain enough input voltage, the range of the alternating current input voltage is expanded, the power source is adapted to voltage input of a wide range, and the flexibility and the interchangeability are strong.
Description
Technical field
The present invention relates to field of power supplies, specifically the imported high-power intrinsic safety electric source of a kind of wide voltage.
Background technology
Under the drive of computer technology and informatization, automatic improving is all actively implemented in the production line in the fields such as colliery, oil, chemical industry, make intelligent instrument, transducer, controller constantly be applied to production line, for guaranteeing safe production, the equipment such as the transducer, communication apparatus, signalling, controller in these fields that are applied to are powered by intrinsic safety electric source; In long-term practice, find, power taking source, production line is selected limited, because existing intrinsic safety electric source is mainly supported the power supply input of a certain electric pressure, this makes troubles to lectotype selection and regular maintenance, and interchangeability is not strong; In addition, existing intrinsic safety electric source load capacity is poor, in the time of load variations, can cause power reset, causes equipment job insecurity.
Summary of the invention
The object of the present invention is to provide the imported high-power intrinsic safety electric source of a kind of wide voltage, this intrinsic safety electric source can provide the voltage input of wide region, and flexibility interchangeability is strong, and has improved load capacity.
The technical solution adopted for the present invention to solve the technical problems is:
The imported high-power intrinsic safety electric source of a kind of wide voltage, comprises the EMI filter circuit of incoming transport electricity, and EMI filter circuit is connected with rectification circuit, high frequency transformer, filter circuit of pressure-stabilizing and over-voltage over-current protection circuit outward in turn, and described intrinsic safety electric source is also provided with:
A. pwm chip and a MOS switching tube, pwm chip receives the VD of over-voltage over-current protection circuit feedback and controls the break-make of a MOS switching tube, described rectification circuit output end is parallel with filter capacitor, and the voltage of filter capacitor output is applied to the elementary of high frequency transformer through a MOS switching tube;
B. MCU module and relay, MCU module is according to the dead electricity that obtains of the voltage signal control relay of high frequency transformer feedback, and described filter capacitor forms voltage doubling rectifing circuit by contact and the rectification circuit of relay.
Further, described over-voltage over-current protection circuit comprises:
A. the 2nd MOS switching tube, the grid of the 2nd MOS switching tube is connected on the output of filter circuit of pressure-stabilizing positive pole, the output of filter circuit of pressure-stabilizing is inputted MCU module after divider resistance dividing potential drop, and MCU module is exported the break-make of gate pole control the 2nd MOS switching tube that connects the 2nd MOS switching tube by amplifying circuit;
B. current-limiting resistance, current-limiting resistance is connected on the output of filter circuit of pressure-stabilizing negative pole; Described intrinsic safety electric source is by source electrode and the current-limiting resistance output voltage of the 2nd MOS switching tube.
Further, the output of described current-limiting resistance is connected with the input interface of MCU module, and MCU module has non-loaded according to feedback current judgement, to control the break-make of the 2nd MOS switching tube.
In such scheme, pwm chip is widely used in the control circuit of inverse-excitation type switch power-supply; Voltage doubling rectifing circuit i.e. coordinating by diode rectifier circuit and filter capacitor, positive half cycle and negative half period in rectification circuit output charge to filter capacitor, realizing the multiple stack of filter capacitor output voltage, is the common circuit that increases Output Voltage in Rectified Circuits.
The invention has the beneficial effects as follows, by the break-make frequency of pwm chip control the one MOS switching tube, be applied to the electric voltage frequency of high frequency transformer on elementary thereby change, guarantee the secondary constant output of high frequency transformer; MCU module as required control relay electric and dead electricity, thereby make to connect the closing of contact and the disconnection of rectification circuit and filter capacitor, make rectification circuit and filter capacitor switch to when needed voltage doubling rectifing circuit, while making AC-input voltage lower, what still guarantee high frequency transformer elementaryly obtains enough input voltages, thereby expanded the scope of AC-input voltage, made this power supply can adapt to the alternating voltage input of wide region, flexibility interchangeability is strong.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is electrical principle block diagram of the present invention;
Fig. 2 is the circuit diagram of voltage doubling rectifing circuit and high frequency transformer in the present invention;
Fig. 3 is the schematic diagram of over-voltage over-current protection circuit in the present invention.
Embodiment
As shown in Figure 1, the imported high-power intrinsic safety electric source of a kind of wide voltage provided by the invention comprises the EMI filter circuit 1 of incoming transport electricity, outer rectification circuit 2, high frequency transformer 4, the filter circuit of pressure-stabilizing 5 and over-voltage over-current protection circuit 6 of being connected with in turn of EMI filter circuit 1; Described intrinsic safety electric source is provided with: a. pwm chip 7, the outer MOS switching tube Q1 who is arranged with its control break-make of pwm chip 7, rectification circuit 2 outputs are parallel with filter capacitor 3, and the voltage that filter capacitor 3 is exported is applied to the elementary of high frequency transformer 4 through a MOS switching tube Q1; B. MCU module 8, MCU module outer 8 is arranged with it and controls to obtain the relay K 1 of dead electricity, and described rectification circuit 2 forms voltage doubling rectifing circuit by contact and the filter capacitor 4 of relay K 1.
Shown in Fig. 2, the gate pole of a MOS switching tube Q1 connects the output interface of pwm chip 7, and the grid of a MOS switching tube Q1 connects the armature winding N1 of high frequency transformer 4, the source ground of a MOS switching tube Q1, rectifier diode D1, D2, D3 and D4 are interconnected to constitute bridge rectifier, as rectification circuit 2, electric capacity E1 and electric capacity E2, as filter capacitor 3, are connected in parallel on the output of rectification circuit 2 mutually after series connection, wherein the positive pole of electric capacity E1 is connected with the negative pole of rectifier diode D2, and the negative pole of electric capacity E2 is connected with the positive pole of rectifier diode D4, the filtered alternating voltage of EMI filter circuit 1 is pulse direct current by bridge rectifier rectification, obtains the armature winding N1 of direct current input high frequency transformer 4 after electric capacity E1 and electric capacity E2 filtering, the positive pole of the secondary winding N6 of high frequency transformer 4 is got back to negative pole after series diode D10 and capacitor C 9 successively, the negative pole of the diode D10 pressure filter circuit being formed by resistance R 30, R32, R31 and capacitor C 10 series-parallel connections of connecting, voltage signal after resistance R 31 dividing potential drops inputs to the input interface of MCU module 8, the output interface of MCU module 8 connect successively signal amplifier 9 and relay K 1 coil and form loop, one end of the normally opened contact of relay K 1 connects the positive pole of rectifier diode D2, and the other end connects the negative pole of electric capacity E1, in the time exchanging the brownout of input, the voltage of armature winding N1 of inputting high frequency transformer 4 after rectifying and wave-filtering is just low, the induced voltage of secondary winding N6 is also low, correspondingly the voltage signal after resistance R 31 dividing potential drops is also low, the voltage that feeds back to so MCU module 8 also can be low, in the time of set point lower than in MCU module 8, MCU module 8 outputs signal to signal amplifier 9 and amplifies rear drive relay K 1 coil, make the normally opened contact closure of relay K 1, now rectifier diode D1, D2, D3 and D4, and electric capacity E1, the normally opened contact of E2 and relay K 1 forms voltage doubling rectifing circuit, in the time of the positive half cycle of rectification output, to electric capacity E1 charging, when negative half period, to electric capacity E2 charging, to exchange input 27V as example, now the voltage of E1 positive pole should be 2*
* 27V=76V, has improved the input voltage of the armature winding N1 of high frequency transformer 4, thereby has expanded the scope of AC-input voltage, makes this power supply that the voltage input of wide region can be provided, and flexibility interchangeability is strong, pwm chip 7 is according to the feedback signal of over-voltage over-current protection circuit 6 output dc voltage V+, change the frequency of output signal, thereby change the frequency of a MOS switching tube Q1 break-make, the frequency that is applied to the upper voltage of armature winding N1 of high frequency transformer 4 through a MOS switching tube Q1 is changed, thereby makes the secondary winding N2 of high frequency transformer 4 guarantee constant output.
Shown in Fig. 3, described over-voltage over-current protection circuit 6 comprises the 2nd MOS switching tube Q2 and current-limiting resistance R39, and the grid of the 2nd MOS switching tube Q2 is connected on the output of filter circuit of pressure-stabilizing 7 positive poles; After resistance R 17, R19 series connection, one end connects the output head anode of filter circuit of pressure-stabilizing 7, and the other end connects the input interface of MCU module 8; Resistance R 18 be connected in parallel on respectively the output of filter circuit of pressure-stabilizing 7 negative poles and one end of R19, capacitor C 8 is connected in parallel on the output of filter circuit of pressure-stabilizing 7 negative poles and the other end of R19, and MCU module 8 connects the gate pole of the 2nd MOS switching tube Q2 by amplifying circuit 10 outputs and controls the break-make of the 2nd MOS switching tube Q2; Current-limiting resistance R39 is connected on the output of filter circuit of pressure-stabilizing 7 negative poles; Voltage is by source electrode and the current-limiting resistance R39 output of the 2nd MOS switching tube Q2; Source electrode and the grid of the 2nd MOS switching tube Q2 are also parallel with resistance R 16; The output of current-limiting resistance R39 is connected with the input interface of MCU module 8, and MCU module 8 has non-loaded according to feedback current judgement, to control the break-make of the 2nd MOS switching tube Q2; In the time of overtension that filter circuit of pressure-stabilizing 7 is exported, the voltage signal that inputs to MCU module 8 through resistance R 19 is also high, resistance R 17, R18 play dividing potential drop effect, capacitor C 8 strobes, and when the voltage that 8 judgements of MCU module receive exceedes set point, outputs control signals to amplifying circuit 10, amplifying circuit 10 exports the gate pole of the 2nd MOS switching tube Q2 to after signal is amplified, the 2nd MOS switching tube Q2 is turn-offed, make power supply Non voltage output, thereby play overvoltage protection effect; In the time of output short circuit, MCU module 8 is controlled the 2nd MOS switching tube Q2 and is turn-offed, the electric current R16 that flows through, and the loop of R39 composition, the electric current that flows through loop is very little, thereby plays the effect of overcurrent protection; In the time that output connects load, MCU module 8 detects the electric current through current-limiting resistance R39, and MCU module 8 is controlled MOS switching tube Q2 and opened, and guarantees output normally, when output is not when bringing onto load, MCU module 8 does not have electric current input, and MCU module 8 is controlled MOS switching tube Q2 and turn-offed, and makes power supply there is no output voltage in not load-carrying situation, guarantee the safety using, effectively suppress the heating of circuit spark and high-power switch tube, realized intrinsically safe circuit and suppressed spark, controlled the object of heating.
In the time manufacturing and assemble, whole power circuit is arranged on a pcb board compactly, and adopt fire-retardant, insulation, heat conduction embedding rubber seal, draw respectively AC input terminal, DC output end and earth terminal by two ends, for guaranteeing power supply good heat radiating, after power source integral embedding, through bottom aluminium sheet heat conduction, heat radiation.
Following table is the data (to export 12V as example) of mining equipment Check and Inspection center, national security production Chongqing test:
| ? | This power parameter | Like product parameter |
| Input voltage range | AC 27V~264V | AC85V~264V |
| Rated operational voltage | DC 12V | DC 12V |
| High open circuit voltage | DC 12.3V | DC 12.5V |
| Maximum output current | 2000mA | 1300mA |
| Voltage drop when 90% load | 12.08V | 11.98V |
| Source effect | 1.2% | 2.5% |
| Load effect | 0.025% | 1.1% |
| Voltage deviation value | 1.9% | 3.5% |
Be not difficult to find out thus, this intrinsic safety electric source can provide the voltage input of wide region, and flexibility interchangeability is strong, and has improved load capacity.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction; Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, be equal to replacements, equivalence change and modify, all still belong to technical solution of the present invention protect scope in.
Claims (3)
1. the imported high-power intrinsic safety electric source of wide voltage; comprise the EMI filter circuit (1) of incoming transport electricity; outer rectification circuit (2), high frequency transformer (4), the filter circuit of pressure-stabilizing (5) and over-voltage over-current protection circuit (6) of being connected with in turn of EMI filter circuit (1); it is characterized in that, described intrinsic safety electric source is also provided with:
A. pwm chip (7) and a MOS switching tube (Q1), pwm chip (7) receives the VD signal of over-voltage over-current protection circuit (6) feedback and controls the break-make of a MOS switching tube (Q1), described rectification circuit (2) output is parallel with filter capacitor (3), and the voltage of filter capacitor (3) output is applied to the elementary of high frequency transformer (4) through a MOS switching tube (Q1);
B. MCU module (8) and relay (K1), MCU module (8) is according to the dead electricity that obtains of the voltage signal control relay (K1) of high frequency transformer (4) feedback, and described filter capacitor (3) forms voltage doubling rectifing circuit by contact and the rectification circuit (2) of relay (K1).
2. the imported high-power intrinsic safety electric source of the wide voltage of one according to claim 1, is characterized in that, described over-voltage over-current protection circuit comprises:
A. the 2nd MOS switching tube (Q2), the grid of the 2nd MOS switching tube (Q2) is connected on the anodal output of filter circuit of pressure-stabilizing (5), the output of filter circuit of pressure-stabilizing (5) is inputted MCU module (8) after divider resistance dividing potential drop, and MCU module (8) connects the break-make of gate pole control the 2nd MOS switching tube (Q2) of the 2nd MOS switching tube (Q2) by amplifying circuit (10) output;
B. current-limiting resistance (R39), current-limiting resistance (R39) is connected on the output of filter circuit of pressure-stabilizing (5) negative pole; Described intrinsic safety electric source is by source electrode and current-limiting resistance (R39) output voltage of the 2nd MOS switching tube (Q2).
3. the imported high-power intrinsic safety electric source of the wide voltage of one according to claim 2, it is characterized in that, the output of described current-limiting resistance (R39) is connected with the input interface of MCU module (8), MCU module (8) has non-loaded according to feedback current judgement, to control the break-make of the 2nd MOS switching tube (Q2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410066624.3A CN103795281A (en) | 2014-02-26 | 2014-02-26 | Wide voltage input type high-power intrinsic safety power source |
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| CN201410066624.3A CN103795281A (en) | 2014-02-26 | 2014-02-26 | Wide voltage input type high-power intrinsic safety power source |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071671A (en) * | 2015-08-05 | 2015-11-18 | 东南大学 | Phase-shifted full-bridge converter for suppressing magnetic flux unbalance of high-frequency transformer |
| CN105553297A (en) * | 2016-01-25 | 2016-05-04 | 四川长虹电器股份有限公司 | Non-isolated switching power supply circuit for super wide voltage input |
| CN110247563A (en) * | 2019-04-03 | 2019-09-17 | 矽力杰半导体技术(杭州)有限公司 | AC-DC conversion circuit and method and charger |
| CN110336465A (en) * | 2019-05-30 | 2019-10-15 | 广东电网有限责任公司 | A kind of input adjustable type relay protecting power plug-in unit |
| CN110336261A (en) * | 2019-06-28 | 2019-10-15 | 重庆光可巡科技有限公司 | A kind of ib power safety grid circuit that load capacity is strong |
| CN112636615A (en) * | 2020-12-10 | 2021-04-09 | 中国计量大学上虞高等研究院有限公司 | Ultra-wide voltage alternating current input AC-DC circuit and method |
| CN113708627A (en) * | 2021-07-26 | 2021-11-26 | 苏州浪潮智能科技有限公司 | Resonant converter |
| WO2022017323A1 (en) * | 2020-07-22 | 2022-01-27 | 广东美的制冷设备有限公司 | Totem pole pfc circuit, control method, circuit board and air conditioner |
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| CN102223749A (en) * | 2011-06-20 | 2011-10-19 | 浙江工业大学 | Inserted type multifunctional light emitting diode (LED) drive circuit |
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| CN102223749A (en) * | 2011-06-20 | 2011-10-19 | 浙江工业大学 | Inserted type multifunctional light emitting diode (LED) drive circuit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071671A (en) * | 2015-08-05 | 2015-11-18 | 东南大学 | Phase-shifted full-bridge converter for suppressing magnetic flux unbalance of high-frequency transformer |
| CN105553297A (en) * | 2016-01-25 | 2016-05-04 | 四川长虹电器股份有限公司 | Non-isolated switching power supply circuit for super wide voltage input |
| CN105553297B (en) * | 2016-01-25 | 2018-05-25 | 四川长虹电器股份有限公司 | A kind of Unisolated switch power circuit of super wide voltage input |
| CN110247563A (en) * | 2019-04-03 | 2019-09-17 | 矽力杰半导体技术(杭州)有限公司 | AC-DC conversion circuit and method and charger |
| CN112260558A (en) * | 2019-04-03 | 2021-01-22 | 矽力杰半导体技术(杭州)有限公司 | AC-DC conversion circuit and method and charger |
| US11245338B2 (en) * | 2019-04-03 | 2022-02-08 | Silergy Semiconductor Technology (Hangzhou) Ltd | Alternating current-direct current conversion circuit, alternating current-direct current conversion method and charger |
| CN110336465A (en) * | 2019-05-30 | 2019-10-15 | 广东电网有限责任公司 | A kind of input adjustable type relay protecting power plug-in unit |
| CN110336261A (en) * | 2019-06-28 | 2019-10-15 | 重庆光可巡科技有限公司 | A kind of ib power safety grid circuit that load capacity is strong |
| WO2022017323A1 (en) * | 2020-07-22 | 2022-01-27 | 广东美的制冷设备有限公司 | Totem pole pfc circuit, control method, circuit board and air conditioner |
| CN112636615A (en) * | 2020-12-10 | 2021-04-09 | 中国计量大学上虞高等研究院有限公司 | Ultra-wide voltage alternating current input AC-DC circuit and method |
| CN113708627A (en) * | 2021-07-26 | 2021-11-26 | 苏州浪潮智能科技有限公司 | Resonant converter |
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Application publication date: 20140514 |