CN2552047Y - Switch power with wide input voltage range - Google Patents
Switch power with wide input voltage range Download PDFInfo
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- CN2552047Y CN2552047Y CN 02271250 CN02271250U CN2552047Y CN 2552047 Y CN2552047 Y CN 2552047Y CN 02271250 CN02271250 CN 02271250 CN 02271250 U CN02271250 U CN 02271250U CN 2552047 Y CN2552047 Y CN 2552047Y
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Abstract
The utility model provides a switch power with wide input voltage range, which comprises a PWM chip, a transformer, an electronic switch, a rectifier filter circuit, a starting circuit and a voltage feedback circuit; and also comprises an input overvoltage protective circuit which is connected with the output end of an error amplifier of a control chip, and a current feedback and voltage compensation circuit, wherein, two input ends of the current feedback and voltage compensation circuit are respectively connected with the electronic switch and one end of a direct current input voltage, and the output of the current feedback and voltage compensation circuit is connected with the current sampling end of the PWM chip. With wide input voltage, the utility model can normally work in alternating current input voltage from 30 to 550 Volt, thereby satisfying the requirements of the electronic electric energy meter; moreover, by use of the PWM chip, the utility model stably works in cooperation with the input overvoltage protective circuit and the current feedback and voltage compensation circuit, thereby simplifying the circuit and decreasing the cost.
Description
Technical field
The utility model belongs to the Switching Power Supply in switch power technology field, particularly a kind of wide input voltage range.
Background technology
Electric energy meter manufacturer tests the requirement of the energy of different electrical networks in order to satisfy power industry, force them to design and to satisfy input voltage simultaneously at 57.5V, 110V, 220V, during the input of 380V alternating current, the energy operate as normal is also measured the electric energy meter how many electric weight the user uses, and the electric energy meter that does not so just need to design plurality of specifications is fit to the different different ammeters of electrical network configuration.
The microprocessor that digital electric meter is used needs stable low-voltage DC ability operate as normal, and power supply converts the alternating current in the electrical network to low-voltage DC that microprocessor needs.Existing electric energy meter Switching Power Supply, input voltage range is narrower, can not adapt to the variation of input voltage 30V-550V, and Electro Magnetic Compatibility is undesirable.
In the patent No. is US5621629, name is called in the United States Patent (USP) of " Switching power supply for use in anelectronic energy meter having a wide range of input voltages ", a kind of ammeter power supply is disclosed, input voltage can change from 96-528V, and power supply can operate as normal.The design feature of this power supply is: one, come clamper with the voltage stabilizing of two-stage line style before Switching Power Supply; Two, all use resolution element to control, start, feedback and control circuit complexity.The shortcoming of sort circuit topology is that prime has been used the two poles of the earth linear voltage stabilization (comprising three pliotrons), only is applicable to low power Switching Power Supply, and the control circuit complexity, and cost can't reduce.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the utility model proposes a kind of Switching Power Supply with wide input voltage range, with simplified control circuit, reduce cost, satisfy the demand in electric energy meter market.
Originally the Switching Power Supply that has wide input voltage range, comprise the start-up circuit (2) of control chip (3), transformer (7), electronic switch (6), the current rectifying and wave filtering circuit (8) that is connected to the secondary winding of transformer (7), control chip power end and the voltage feedback circuit (5) of control chip feedback sample end, the elementary windings in series of electronic switch (6) and transformer (7) is characterized in that also comprising:
Protection circuit against input over-voltage (1), it is connected to the error amplifier output terminal of control chip (3); And, current feedback and voltage compensating circuit (4), its two input ends connect electronic switch and DC input voitage one end respectively, and the current sampling end of output and control chip (3) joins.
Advantage of the present utility model compared with the prior art is as follows:
Input voltage is wide, and this power supply can be an operate as normal when exchanging 30V-550V at input voltage, has satisfied the needs that can both use on all electrical networks.
Adopt the pulse-length modulation chip to control the operate as normal of power supply, designed protection circuit against input over-voltage current feedback and voltage compensating circuit, control circuit is simplified, production cost reduces.
Satisfy electromagnetic compatibility standard, particularly can prevent the impact of lightning surge and do not burnt, can operate as normal under exceedingly odious electrical network situation.
Description of drawings
Fig. 1 is the block diagram of this Switching Power Supply;
Fig. 2 is an embodiment circuit diagram of this Switching Power Supply.
Embodiment
Below in conjunction with accompanying drawing the utility model Switching Power Supply is described in detail.
As shown in Figure 1, 2; Switching Power Supply comprises: the elementary windings in series of the start-up circuit (2) of control chip (3), transformer (7), electronic switch (6), control chip (3) and voltage feedback circuit (5), the current rectifying and wave filtering circuit (8) that is connected to the secondary winding of transformer (7), electronic switch (6) and transformer (7), protection circuit against input over-voltage (1) and current feedback and voltage compensating circuit (4).The error amplifier output terminal of protection circuit against input over-voltage (1) and control chip joins; the feedback sample end of voltage feedback circuit (5) and control chip joins; the current sampling end of current feedback and voltage compensating circuit (4) and control chip joins, and the power end Vcc of start-up circuit (2) control chip joins.
Control chip is pulse-length modulation chip (PWM), and its output square wave comes turning on and off of gauge tap pipe; The elementary winding that this switching tube is connected on transformer comes the energy of control transformer to transmit; Transformer comprises output windings and one group of feedback winding organized more, and the Voltage Feedback of feedback winding makes output voltage stabilization to the closed-loop control of pulse width modulating chip realization PWM.When input had only 30V, the energy of storing by the electrochemical capacitor charging started pulse width modulating chip, the output square wave, and feeding back winding in the short period of time has output voltage, to the pulse width modulating chip power supply, reaches the purpose of control output voltage; When input voltage reaches 550V, make the pulse width modulating chip failure of oscillations by holding circuit, switching tube turn-offs, and power supply quits work.
Start-up circuit (2) and the same custom circuit of voltage feedback circuit (5).Start-up circuit (2) is made up of resistance R s and capacitor C s.Voltage feedback circuit (5) comprises feedback winding Nf and diode rectification filtering circuit etc.
When input voltage has only 30V, input voltage slowly charges to capacitor C s through excessive resistance R s, after several seconds, voltage on the Cs reaches the trigger voltage (16V) of pulse width modulating chip, and can provide the electric current of 1mA, control chip (3) work, the output square wave, the turn-on and turn-off that switching tube (6) does not stop, just have electric current to flow through the elementary winding of switching tube (6) and transformer (7), Voltage Feedback winding Nf just has voltage output, powers to control chip, whole power supply just can successfully start, and can give oneself power supply.If can not successfully start, when the voltage on the Cs was lower than 8.4V, the inner under-voltage locking of pulse width modulating chip (3) quit work, and Cs charges by Rs again.This process constantly repeats, till power initiation.Capacitor C s is 56 microfarads, can store enough energy and provide electric current more than the 1mA to control chip at short notice.
When input voltage is a high voltage but when being lower than 550V, electric current charges to Cs through Rs, and by the 34V voltage stabilizing diode of control chip inside the input voltage of chip is limited in 34V, chip output PWM ripple continuously under this supply voltage, driving switch pipe (6) and transformer (7) make power initiation.Resistance R s is 500 kilohms, has limited the electric current that flows through inner voltage stabilizing diode and has been slightly larger than 1mA, and the protection control chip is not burnt.
When input voltage was higher than 550V, protection circuit against input over-voltage (1) output low level made control chip not have square wave output.Protection circuit against input over-voltage (1) is by resistance R 11, R12 and the R13 branch road of series connection; triode T11 and stabilivolt Vz form; stabilivolt Vz is connected between the common port of triode T11 base stage and resistance R 12 and R13, and the collector of triode T11 connects the error amplifier output terminal of control chip (3).
When input voltage is higher than 550V, input voltage is by resistance R 11, R12 and R13 dividing potential drop, when the voltage on the R13 adds the base-emitter voltage (0.7V) of triode T11 greater than voltage stabilizing diode forward voltage Vz, the T11 conducting, the output voltage error amplifier of control chip (3) is dragged down, control chip does not have square wave output, and switching tube (6) turn-offs, and power supply quits work.Can input overvoltage protection point be set by following formula:
Ui * R13/ (R11+R12+R13)=Vz+0.7V as can be seen, when the DC voltage peak value of input ac voltage behind overcommutation surpassed Ui, power supply quit work.
Among Fig. 2, the input voltage sample circuit that the current-limiting resistance R209 of switching tube (6) and resistance in series R204, R205, R208 and R209 constitute has constituted current feedback and voltage compensating circuit (4).
After power supply successfully starts, R210, the Voltage Feedback that R211 exports winding Nf is given the error amplifier of control chip inside, and the width of gating pulse width modulator output square wave is regulated output voltage stabilization.Electric current by primary winding and switching tube (6) has voltage drop V1 on R209; Input voltage is through R204, R205, and the dividing potential drop that R208 and R209 are ordered at A is V2; The sampled signal that passes to control chip by R212 is:
V
A＝V1+V2
V
AAs the compensating signal of input voltage and output current, make power supply working stability when different input voltages and output current.During operate as normal, V
A＜1V, and signal passes to chip by way of compensation, the square width of compensation output makes output voltage regulate voluntarily according to input voltage and the different of output current, exports more stable; Excessive when output current, V1 is bigger, causes V
ADuring＞1V, the inner PWM of control chip latchs, no square wave output, and switching tube (6) turn-offs, and power supply quits work, and reaches the purpose of output overcurrent protection.
Fig. 2 is to use the electrical energy meter electricity source instance of this Switching Power Supply.In order to guarantee the stable of multichannel output voltage, the voltage output end of Fig. 2 three terminal regulator of having connected respectively.
Input end series connection R201, R202, R203 are in order to reduce the conducted noise on the power lead.Exchange voltage dependent resistor (VDR) RV1 in parallel between the incoming line, RV2, RV3, RV4, RV5 and RV6 are lightning protection components, the protection commutation diode suffers thunder and lightning and burns.Connect voltage dependent resistor (VDR) RV7 and RV8 series arm between two input ends of power supply, suffering can release electric current more than the 1KA of thunderstorm hour, voltage can drop to R201 greatly, on R202 and the R203, has protected switching tube.This power supply satisfies IEC61000-2, and 3,4,5 standards are to electromagnetic compatibility requirements, and the lightning surge that can bear 13KV impacts and do not burn.
Claims (4)
1, a kind of Switching Power Supply with wide input voltage range, comprise the start-up circuit (2) of control chip (3), transformer (7), electronic switch (6), the current rectifying and wave filtering circuit (8) that is connected to the secondary winding of transformer (7), control chip power end and the voltage feedback circuit (5) of control chip feedback sample end, the elementary windings in series of electronic switch (6) and transformer (7) is characterized in that also comprising:
Protection circuit against input over-voltage (1), it is connected to the error amplifier output terminal of control chip (3); And, current feedback and voltage compensating circuit (4), its two input ends connect electronic switch and DC input voitage one end respectively, and the current sampling end of output and control chip (3) joins.
2, according to the described Switching Power Supply of claim 1; it is characterized in that: protection circuit against input over-voltage (1) is by resistance R 11, R12 and the R13 branch road of series connection; triode T11 and stabilivolt Vz form, and stabilivolt Vz is connected between the common port of triode T11 base stage and resistance R 12 and R13.
3, according to the described Switching Power Supply of claim 1, it is characterized in that: current feedback and voltage compensating circuit (4) comprise, the input voltage sample circuit that resistance in series R204, R205, R208 and R209 constitute, and the current-limiting resistance R209 of switching tube (6).
4, according to the described Switching Power Supply of claim 1, it is characterized in that: connect voltage dependent resistor (VDR) RV7 and RV8 series arm between two input ends of power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02271250 CN2552047Y (en) | 2002-06-19 | 2002-06-19 | Switch power with wide input voltage range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02271250 CN2552047Y (en) | 2002-06-19 | 2002-06-19 | Switch power with wide input voltage range |
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| CN2552047Y true CN2552047Y (en) | 2003-05-21 |
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| CN 02271250 Expired - Fee Related CN2552047Y (en) | 2002-06-19 | 2002-06-19 | Switch power with wide input voltage range |
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Cited By (32)
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|---|---|---|---|---|
| WO2007041896A1 (en) * | 2005-10-09 | 2007-04-19 | System General Corp. | Switching control circuit with variable switching frequency for primary-side-controlled power converters |
| WO2007041895A1 (en) * | 2005-10-09 | 2007-04-19 | System General Corp. | Switching control circuit having off-time modulation to improve efficiency of primary-side controlled power supply |
| WO2007041893A1 (en) * | 2005-10-09 | 2007-04-19 | System General Corp. | Close-loop pwm controller for primary-side controlled power converters |
| CN1929230B (en) * | 2005-07-07 | 2010-06-09 | 电力集成公司 | Power converter and power supply for conditional response to a fault condition |
| CN102064532A (en) * | 2011-01-12 | 2011-05-18 | 深圳茂硕电源科技股份有限公司 | Overvoltage protection circuit of input follower type |
| CN102130597A (en) * | 2011-03-18 | 2011-07-20 | 上海交通大学 | Switching power supply with single-stage high wide input voltage |
| CN101847929B (en) * | 2009-03-23 | 2012-09-26 | 尼克森微电子股份有限公司 | Power supply control circuit with compensation function of line loss of power supply line |
| US8416593B2 (en) | 2008-05-12 | 2013-04-09 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Switching power supply with over-current protection and electronic device using the same |
| CN103036436A (en) * | 2012-11-29 | 2013-04-10 | 无锡市金赛德电子有限公司 | Switching power supply parallel control circuit and method of switching power supply parallel control |
| CN103166196A (en) * | 2011-12-15 | 2013-06-19 | 广闳科技股份有限公司 | Power conversion circuit with overvoltage protection |
| CN103187721A (en) * | 2011-12-28 | 2013-07-03 | 三星电机株式会社 | Power supply apparatus including overvoltage protection function |
| CN103187711A (en) * | 2013-04-18 | 2013-07-03 | 山东五洲电气股份有限公司 | Automatic overvoltage protection circuit for switching power supply |
| US8482946B2 (en) | 2005-08-18 | 2013-07-09 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current and over power protection for power converter |
| US8559152B2 (en) | 2010-12-08 | 2013-10-15 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
| CN104300503A (en) * | 2014-10-28 | 2015-01-21 | 西安科技大学 | Switching mode power supply input voltage range expansion circuit and design method thereof |
| US9553501B2 (en) | 2010-12-08 | 2017-01-24 | On-Bright Electronics (Shanghai) Co., Ltd. | System and method providing over current protection based on duty cycle information for power converter |
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