CN203243226U - Switch power source - Google Patents
Switch power source Download PDFInfo
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- CN203243226U CN203243226U CN 201320179455 CN201320179455U CN203243226U CN 203243226 U CN203243226 U CN 203243226U CN 201320179455 CN201320179455 CN 201320179455 CN 201320179455 U CN201320179455 U CN 201320179455U CN 203243226 U CN203243226 U CN 203243226U
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Abstract
The utility model relates to a switch power source. The utility model aims to provide the switch power source that is good in high-voltage bearing capacity and not easy to burn. The technical scheme provided by the utility model is that the switch power source includes bridge rectifiers. An output terminal of the bridge rectifiers is connected with an EMI filtering module, an input rectification filtering module and a DC-DC converting circuit. The switch power source is characterized in that a clamp protecting module is arranged between the EMI filtering module and the input rectification filtering module. The switch power source provided by the utility model is suitable for supplying power for an intelligent ammeter.
Description
Technical field
The utility model relates to a kind of Switching Power Supply, is mainly used in the power supply of intelligent electric energy meter.
Background technology
Electronic type electric energy meter electric source mainly is divided into transformer frequency response, resistance-capacitance depressurization power supply, Switching Power Supply at present.Transformer frequency response is strong with antijamming capability, ripple voltage is little, cost is low, make the advantages such as simple, reliable and stable, in intelligent electric energy meter, be widely used, but also there are the shortcomings such as voltage power supply narrow range, power density is little, efficient is low, the limitation that causes transformer frequency response to use.The resistance-capacitance depressurization power supply has the advantages such as volume is little, circuit is simple, thereby more and more adopted by electronic electric energy meter producer, and because its non-isolation, be not suitable for high-power, capacitive, perception, dynamic load, components and parts are selected to require the shortcomings such as high, thereby can only use in common electrical minor electric energy meter.Switching Power Supply is high with efficient, volume is little, voltage power supply wide ranges, technical scheme optional many, easily realize being widely used input and output isolation, power density advantages of higher in each field of electron trade.Electronic electric energy meter is just towards high intelligence, high accuracy, high reliability and the full-automatic future development of charging now, to efficient, load capacity, volume, operating voltage range, the output voltage precision of power supply, proposed more and more higher requirement.Three-phase electric energy meter Switching Power Supply in the past adopts Flyback topology or the simple Flyback topological structure based on the Stackfet of PI company switching power source chip basically.The former power limited in these two kinds of structures, and on peak current Ipeak that former limit winding produces, peak voltage Vdspeak that leakage inductance produces all can pass through metal-oxide-semiconductor, cause the metal-oxide-semiconductor switching loss to increase, easy burning machine when the power supply input has high pressure to enter; The latter is owing to be single MOS, and the VDSS voltage of metal-oxide-semiconductor is restricted, therefore causes the high pressure ability to bear of power supply limited.
Summary of the invention
The technical problems to be solved in the utility model is: the problem for above-mentioned existence provides the Switching Power Supply that a kind of high pressure ability to bear is strong, be difficult for burning.
The technical scheme that the utility model adopts is: Switching Power Supply; comprise rectifier bridge stack; the output of this rectifier bridge stack is connected with EMI filtration module, input rectifying filtration module and DC-DC translation circuit in turn, it is characterized in that: be provided with the clamper protection module between described EMI filtration module and the input rectifying filtration module.
Described DC-DC translation circuit comprises the transformer that is connected with input rectifying filtration module output, the output rectification filter module that is connected with the transformer output; Wherein be connected with the switch module for the control transformer operating state on the transformer primary side coil, the control input end of this switch module is connected with the pwm chip for its break-make of control; The output of output rectification filter module is connected with secondary feedback module, and output and the pwm chip of this feedback module are connected to form feedback loop.
Be in series with current sampling resistor on the described switch module, this current sampling resistor one end ground connection, the other end is connected with pwm chip by wire.
Described switch module is power MOS pipe, and its drain electrode is connected with the transformer primary side coil, and source electrode is ground connection behind current sampling resistor, and grid is connected with the control signal output of pwm chip.
The model of described power MOS pipe is 5N90 or 6N90.
The model of described pwm chip is FAN6755W.
Described clamper protection module input or output are connected to the overvoltage detection port of pwm chip by 0 ohm resistance.
Described secondary feedback module comprises three end adjustable shunt pressurizers, and the optocoupler that is connected in this three ends adjustable shunt output end of voltage stabilizer, wherein three end adjustable shunt pressurizer inputs are connected with output rectification filter module output, and the optocoupler output is connected with pwm chip.
The model of described three end adjustable shunt pressurizers is TL431, and the model of optocoupler is PC817.
The beneficial effects of the utility model are: 1, between EMI filtration module and input rectifying filtration module the clamper protection module is set; the magnitude of voltage of output can be limited to a definite value; thereby improved the high pressure ability to bear of power supply; the clamper protection module can play metering function simultaneously, thereby has protected late-class circuit.2, the pwm chip of Switching Power Supply adopts the FAN6755W of Fairchild company; behind the clamper protection module; so that the utility model Switching Power Supply had both possessed the excellent properties of flyback topology Switching Power Supply; the ability that possesses again the anti-high pressure of the Stackfet of PI company technical pattern, can overcome again simultaneously that peak voltage Vdspeak that Stackfet structure power limited, upper metal-oxide-semiconductor produce by the former limit of high frequency transformer winding peak current Ipeak and leakage inductance can affects and easily hot, ultra-voltage scope cause power supply to burn the defective of machine.Therefore reduced Switching Power Supply the super wide voltage working range (65 ~ 550VAC), middle low power, badly input design difficulty under the power grid environment, for the electronic type intelligent electric energy meter (particularly three-phase electric energy meter) of high intelligence, high reliability provides the power supply guarantee of high performance nature.3, FAN6755W built-in over-voltage protective, overcurrent protection and short-circuit protection, thus the reliability of power supply guaranteed.4, the utility model can be worked by wide-voltage range 65 ~ 550VAC, inputs the highest withstand voltage 1.6KVDC, single, mutually isolation of multichannel output, and meet the IEC relevant criterion.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1 and Figure 2; present embodiment be a kind of based on the flyback topological structure, can wide-voltage range (the Switching Power Supplies of 65 ~ 550VAC) work; it has added a clamper protection module in traditional flyback topology Switching Power Supply, specifically comprise the rectifier bridge stack 1, EMI filtration module 2, clamper protection module 4, input rectifying filtration module 3 and the DC-DC translation circuit that connect successively.
Described rectifier bridge stack 1 is comprised of four groups of diodes, and its input connects alternating current (AC IN), is used for AC rectification is become direct current.
Described EMI filtration module 2 mainly comprises common mode inductance LP1, capacitor C XP4(X electric capacity), capacitor C XP5(X electric capacity), its input is connected with the output of rectifier bridge stack 1; Make this power supply satisfy the electromagnetic compatibility characteristic, suppress common mode, difference mode signal to the impact of electrical network, and power supply makes it meet the IEC standard to the electromagnetic interference of other electronic equipment.
Described clamper protection module 4 is mainly by clamper protection device (UP5, model is HB10071), and corresponding peripheral circuit composition, and its input is connected with the output of EMI filtration module 2.When input voltage was lower than the clamp voltage value (can set different values according to actual conditions) that sets, clamper protection module 4 was inoperative, and direct voltage directly is delivered to input rectifying filtration module 3 by this module; When input voltage is higher than the clamp voltage value that sets, clamper protection module 4 will play clamping action, and the magnitude of voltage of output is limited to certain value.As: the clamp voltage of setting is 700VDC; if enter UP5 pin 1(Vin behind the rectifying and wave-filtering) value＞700VDC; during for 1000VDC; the pin 2(Vout of UP5 then) output voltage is that 700VDC(is that clamper protection module output voltage values is 700VDC); its difference 300V; born by UP5, can not surpass 700VDC to guarantee the dc voltage value that enters input rectifying filtration module 3.And as (Vin) that enter UP5 pin 1 when value is lower than 700VDC, such as Vin=500VDC, then clamper protection module 4 is inoperative, and the 500V direct voltage directly by UP5, is delivered to input rectifying filtration module 3.Clamper protection module 4 also plays the effect of current limliting in addition, and cut-off current is 1A, and when the value by UP5 during greater than 1A, clamper protection module 4 will turn-off, and the Vout output valve is 0V, plays the effect of protecting late-class circuit.
Described input rectifying filtration module 3 mainly comprises two electric capacity (ECP1, ECP2 of series connection, be connected to after the series connection between the pin 2 and PGND of clamper protection module 4), and four grading resistors (RP15, RP16, RP17, RP18 are used for preventing that two capacitance voltage imbalances from causing electric capacity to puncture, damage); Be used for the filtering alternating component, make the direct current after the rectification more level and smooth.
Described DC-DC translation circuit comprises high frequency transformer 5, output rectification filter module 6, switch module 7(QP1, adopting model is the power MOS pipe of 5N90 or 6N90), pwm chip 8(UP2, adopt the FAN6755W chip of Fairchild company), secondary feedback module 9 and current sampling resistor 10; Wherein transformer 5 inputs are connected with input rectifying filtration module 3 outputs, and output is connected with output rectification filter module 6; Switch module 7 is connected with pwm chip with transformer 5 simultaneously and is connected, utilize the break-make of pwm chip 8 control switch modules 7, thereby realization is to the control of transformer 5 operating states; Switch module 7 is connected with current sampling resistor 10, crosses the electric current of switch module 7 with sample streams; The output of output rectification filter module 6 is connected to pwm chip 8 by secondary feedback module 9 and forms feedback loop, to adjust the duty ratio of pwm chip 8 output pulse signals according to output voltage.
In this example, primary coil one end of transformer 5 is connected with input rectifying filtration module 3 outputs, and the other end is connected with the drain electrode of power MOS pipe (QP1), and the source electrode of this power MOS pipe (QP1) ground connection behind current sampling resistor 10 forms a circuit loop; The grid of described power MOS pipe (QP1) and the pin 5(Gate of pwm chip 8) be connected, come the break-make of power ratio control metal-oxide-semiconductor (QP1) by pwm chip 8 output signals, thereby control the break-make in aforementioned loop (switch module and loop, current sampling resistor place), and then reach the purpose of control transformer 5 operating states.The end that described current sampling resistor 10 is connected with power MOS pipe (QP1) is connected to the pin 3(SENSE of pwm chip 8 by wire), be used for current sampling resistor 10 is carried out voltage sample.The pin 8(HV of described pwm chip 8) behind resistance R P20 and resistance R P21, is connected to the tie point of two electric capacity (ECP1, ECP2).
Described secondary feedback module 9 is mainly by three end adjustable shunt pressurizer TL431(UP7) and optocoupler PC817(UP3) and peripheral resistance capacitance form, wherein RP48, RP50, RP51 are bleeder circuit, RP49, CP16 are that differential circuit, RP52, CP17 are integrating circuit, and differential, integrating circuit form the loop compensation circuit of three end adjustable shunt pressurizer TL431 jointly.The output of optocoupler PC817 is connected to the pin 2(FB of pwm chip 8).
In order to take full advantage of the overvoltage measuring ability of pwm chip 8, improve power supply reliability, can detect to rectifier bridge stack 1 rectification and by the direct voltage behind the EMI filtration module 2, also can the voltage after clamper protection module 4 clampers be detected, concrete test point can be selected according to actual needs; For the former, can connect at clamper protection module 4 inputs (pin 1 of UP5) one 0 ohm resistance (RP56), this resistance other end is connected to the pin 1(Vin of pwm chip 8); For the latter, can connect at clamper protection module 4 outputs (pin 2 of UP5) one 0 ohm resistance (RP57), this resistance other end is connected to the pin 1(Vin of pwm chip 8); Two resistance (RP56 and RP57 can only choose one wantonly and be welded in the circuit).
The operation principle of present embodiment is as follows: when Switching Power Supply was opened, then alternating current output DC after rectifier bridge stack 1 rectification exported the primary coil of transformer 5 to successively to EMI filtration module 2 through clamper protection module 4 and input rectifying filtration module 3; Meanwhile, electric current flows through the pin 8(HV of pwm chip 8) to pin 6(Vcc) external capacitive (ECP3, the 100uF/35V electrochemical capacitor), when the voltage on the electric capacity reached the starting resistor VDD-on of pwm chip 8, pwm chip 8 was started working; 8 pairs of input voltages of pwm chip this moment carry out overvoltage and detect, when detecting input voltage and surpass the magnitude of voltage that circuit sets, pwm chip 8 meeting switch-off power metal-oxide-semiconductors (QP1), stop power supply output, and pwm chip 8 enters Auto-Restart mode of operation (under this pattern, can automatically recover normal operation behind the Failure elimination); During switch-off power metal-oxide-semiconductor (QP1), aforementioned loop (switch module and loop, current sampling resistor place) disconnects, the primary coil of high frequency transformer 5 does not have electric current to flow through all the time, former limit inductance does not just have stored energy yet, secondary just do not have magnetic energy to be converted to electric energy yet, so transformer secondary output, namely the OUT end does not just have output voltage.
When detecting the magnitude of voltage that input voltage sets less than circuit, pwm chip 8 is by pin 5(Gate) to the grid transmitted signal of power MOS pipe (QP1), the break-make of power ratio control metal-oxide-semiconductor (QP1); When power MOS pipe (QP1) when opening, aforementioned loop (switch module and loop, current sampling resistor place) connected, transformer 5 primary coil current flowings, former limit inductance stored energy; When power MOS pipe (QP1) turn-offs, the energy that the primary coil inductance is stored is delivered to secondary side by magnetic core, then pass through secondary side output rectification filter module 6, transfer energy to output, realize the transmission (consistent with the energy transfer mode of traditional flyback topological structure) of energy.
In the whole energy transfer process, by the voltage on the current sampling resistor 10 being sampled (because current sampling resistor is connected with power MOS pipe, therefore flow through both electric current is identical), and the voltage that sampling obtains is sent into the pin 3(SENSE of pwm chip 8), compare by internal current comparator and VLimit, if greater than VLimit, then comparator is exported high level, and by rest-set flip-flop, reduce the duty ratio of pwm chip 8 output pulse signals, and then reduce output.Otherwise, then increase duty ratio, increase output, to guarantee the stability of electric power output voltage.Its principle is as follows: the VLimit value is pwm chip 8(FAN6755W) reference value of inner setting, irrelevant with external circuit, concrete magnitude of voltage is between 0.6 ~ 0.85V; The current signal (being the electric current that flows through power MOS pipe) that will flow through sampling resistor 10 by SENSE pin (pin 3) changes voltage signal into by the V=I*R relational expression, then the reference voltage level VLimit that enters pwm chip 8 internal comparator and setting compares, and then the duty ratio size of control chip output, with stable output secondary voltage.
Simultaneously, for secondary feedback module 9, when V=RP51/ (RP48+RP50+RP51) * VO＞2.5V, the output voltage values that is VO＞12V(output rectification filter module 6 requires to be controlled at 12V), pin 1 output low level of three end adjustable shunt pressurizer TL431, optocoupler PC817 (UP3) light-emitting diode current flowing, drive the optocoupler triode, drag down pwm chip 8(FAN6755W) pin 2(FB) voltage, this moment, pwm chip 8 reduced the duty ratio D of output pulse signal by internal control circuit, reduce the 5 former limit inductive energy storage times of transformer, then reduce the output voltage of transformer 5; Otherwise when V=RP51/ (RP48+RP50+RP51) * VO＜2.5V, be VO＜12V, the pin 1 output high level of three end adjustable shunt pressurizer TL431, optocoupler is not worked, pwm chip 8 increases the duty ratio D of output pulse signal, increase by the 5 former limit inductive energy storage times of transformer, then increase the output voltage of transformer 5.The feedback of secondary feedback module 9 by going round and beginning again impels pwm chip 8 to increase, reduce the duty ratio of pulse signal, and the output voltage of controlling output rectification filter module 6 is constant in 12V.
Claims (9)
1. Switching Power Supply; comprise rectifier bridge stack (1); the output of this rectifier bridge stack is connected with EMI filtration module (2), input rectifying filtration module (3) and DC-DC translation circuit in turn, it is characterized in that: be provided with clamper protection module (4) between described EMI filtration module (2) and the input rectifying filtration module (3).
2. Switching Power Supply according to claim 1, it is characterized in that: described DC-DC translation circuit comprises the transformer (5) that is connected with input rectifying filtration module (3) output, the output rectification filter module (6) that is connected with the transformer output; Wherein be connected with the switch module (7) for control transformer (5) operating state on transformer (5) primary coil, the control input end of this switch module is connected with the pwm chip (8) for its break-make of control; The output of output rectification filter module (6) is connected with secondary feedback module (9), and the output of this feedback module and pwm chip (8) are connected to form feedback loop.
3. Switching Power Supply according to claim 2 is characterized in that: be in series with current sampling resistor (10) on the described switch module (7), and this current sampling resistor one end ground connection, the other end is connected with pwm chip (8) by wire.
4. Switching Power Supply according to claim 3, it is characterized in that: described switch module (7) is power MOS pipe, its drain electrode is connected with transformer (5) primary coil, and source electrode is ground connection behind current sampling resistor (10), and grid is connected with the control signal output of pwm chip (8).
5. Switching Power Supply according to claim 4, it is characterized in that: the model of described power MOS pipe is 5N90 or 6N90.
6. according to claim 2 or 3 or 4 or 5 described Switching Power Supplies, it is characterized in that: the model of described pwm chip (8) is FAN6755W.
7. according to claim 2 or 3 or 4 or 5 described Switching Power Supplies, it is characterized in that: described clamper protection module (4) input or output are connected to the overvoltage detection port of pwm chip (8) by 0 ohm resistance.
8. according to claim 2 or 3 or 4 or 5 described Switching Power Supplies, it is characterized in that: described secondary feedback module (9) comprises three end adjustable shunt pressurizers, and the optocoupler that is connected in this three ends adjustable shunt output end of voltage stabilizer, wherein three end adjustable shunt pressurizer inputs are connected with output rectification filter module (6) output, and the optocoupler output is connected with pwm chip (8).
9. Switching Power Supply according to claim 8, it is characterized in that: the model of described three end adjustable shunt pressurizers is TL431, the model of optocoupler is PC817.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320179455 CN203243226U (en) | 2013-04-11 | 2013-04-11 | Switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320179455 CN203243226U (en) | 2013-04-11 | 2013-04-11 | Switch power source |
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| CN203243226U true CN203243226U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320179455 Expired - Lifetime CN203243226U (en) | 2013-04-11 | 2013-04-11 | Switch power source |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954312A (en) * | 2014-04-24 | 2014-07-30 | 福建顺昌虹润精密仪器有限公司 | Data acquisition paperless recorder |
| CN104811026A (en) * | 2015-05-27 | 2015-07-29 | 成都德麦科技有限公司 | Switch power supply |
| CN106067731A (en) * | 2016-07-12 | 2016-11-02 | 宁波三星医疗电气股份有限公司 | A kind of switch power supply EMI circuit |
| CN107272799A (en) * | 2017-05-22 | 2017-10-20 | 兖州煤业股份有限公司 | A kind of low-voltage wideband power supply |
| CN107681874A (en) * | 2017-09-29 | 2018-02-09 | 杭州海兴电力科技股份有限公司 | Protection circuit and electric energy meter multiple-channel output reverse exciting switching voltage regulator |
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN111210768A (en) * | 2018-11-22 | 2020-05-29 | 联咏科技股份有限公司 | Sensing circuit of organic light emitting diode driving device and driving device thereof |
-
2013
- 2013-04-11 CN CN 201320179455 patent/CN203243226U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954312A (en) * | 2014-04-24 | 2014-07-30 | 福建顺昌虹润精密仪器有限公司 | Data acquisition paperless recorder |
| CN104811026A (en) * | 2015-05-27 | 2015-07-29 | 成都德麦科技有限公司 | Switch power supply |
| CN106067731A (en) * | 2016-07-12 | 2016-11-02 | 宁波三星医疗电气股份有限公司 | A kind of switch power supply EMI circuit |
| CN107272799A (en) * | 2017-05-22 | 2017-10-20 | 兖州煤业股份有限公司 | A kind of low-voltage wideband power supply |
| CN107681874A (en) * | 2017-09-29 | 2018-02-09 | 杭州海兴电力科技股份有限公司 | Protection circuit and electric energy meter multiple-channel output reverse exciting switching voltage regulator |
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN111210768A (en) * | 2018-11-22 | 2020-05-29 | 联咏科技股份有限公司 | Sensing circuit of organic light emitting diode driving device and driving device thereof |
| US11205382B2 (en) | 2018-11-22 | 2021-12-21 | Novatek Microelectronics Corp. | Sensing circuit for OLED driver and OLED driver using the same |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131016 |