CN105024560A - Automatic conversion device of alternating current power supply - Google Patents
Automatic conversion device of alternating current power supply Download PDFInfo
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- CN105024560A CN105024560A CN201510474960.6A CN201510474960A CN105024560A CN 105024560 A CN105024560 A CN 105024560A CN 201510474960 A CN201510474960 A CN 201510474960A CN 105024560 A CN105024560 A CN 105024560A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to an automatic conversion device of an alternating current power supply, which belongs to the field of power electronics and aims to solve the problems that the requirement of power supply parameters of the power supply cannot be completely satisfied by the traditional converter, the output voltage stability is poor, and harmonic pollution to a power grid and magnetic pollution to an environment are easily caused due to potential safety hazard existing in manual operation of voltage ratio. The automatic conversion device comprises two stages of circuits, wherein the front stage is a Boost circuit having active power factor correction (APFC) function, the rear stage is a full-bridge inversion circuit, the full-bridge inversion circuit can be used for automatically switching output according to the grade of an input voltage, the Boost circuit can be used for boosting a wide-range alternating current into 400V direct current for output, and the full-bridge inversion circuit is used for automatically switching output voltage and frequency according to the input voltage. By the automatic conversion device, automatic switching of sine alternating current voltage between 220V/50Hz and 110V/60Hz can be achieved. The automatic conversion device is used for automatic switching of normal mains supply between 110V/60Hz and 220V/50Hz.
Description
Technical field
The present invention relates to a kind of AC power automatic transfer equipment, belong to field of power electronics.
Background technology
Along with development that is economic and science and technology, globalization process, in continuous quickening, also creates series of problems thereupon.Civilian alternating current mainly contains 110V/60Hz and 220V/50Hz two kinds in the world, thus there is the civil electric appliance of power supply mode.
At present, the power supply adaptor of part high level electrical equipment have employed switch power technology, can work in the wide-voltage range of AC85V ~ 240V, but civil electric appliance still has strict restriction to the power supply system of AC power mostly, when power supply does not mate, need additional configuration boosting or the AC power transducer of step-down.What conventional transducer adopted is the Industrial Frequency Transformer manually selecting 2:1 or 1:2 no-load voltage ratio, although this transducer is simple and reliable, because weight is large, volume large, is not easy to travelling and carries.And, in use also there is following problem: the output frequency of transformer is identical with incoming frequency, Power supply parameter request can not be met completely; The output voltage of transducer fluctuates with voltage ripple of power network, the poor stability of output voltage; Once there is the manual selection mistake of voltage change ratio, converter and load appliance damage thereof can be caused; When accessing non-resistive electric appliance load, its power factor is lower, and the actual exportable power of converter is less than converter nominal capacity; If electric appliance load is nonlinear, at grid side generation current harmonic wave, the harmonic pollution of electrical network and the electromagnetic pollution of environment can be caused.
Summary of the invention
The present invention seeks to the requirement that can not meet Power supply parameter in order to solve existing transducer completely, the poor stability of output voltage, there is potential safety hazard in voltage change ratio manual operation, easily cause the problem of the harmonic pollution of electrical network and the electromagnetic pollution of environment, provide a kind of AC power automatic transfer equipment.
AC power automatic transfer equipment of the present invention, it comprises two-stage circuit, and prime is the Boost circuit with APFC function; Rear class is the full bridge inverter that can export according to the automatic switchover of input voltage grade, specifically comprises diode bridge rectifier circuit, pwm control circuit, accessory power supply, SPWM control circuit, full bridge inverter and Boost circuit;
Civil power input is by exporting after diode bridge rectifier circuit rectification, two inputs of Boost circuit connect output terminals A and the output B of diode bridge rectifier circuit respectively, are parallel with filter capacitor C between diode bridge rectifier circuit output terminals A and output B
0, output C and the output D of Boost circuit are connected two inputs of full bridge inverter respectively, are parallel with electrochemical capacitor C between the output C of Boost circuit and output D
bthe output E of full bridge inverter is connected load with output F simultaneously, pwm control circuit is for driving Boost circuit, and SPWM control circuit is for driving full bridge inverter, and accessory power supply is used for providing low-voltage DC for AC power automatic transfer equipment;
Boost circuit can receive the alternating current of wide region, and Boost circuit, can by the boosting of wide region alternating current for 400V direct current exports under pwm control circuit drives; Described wide region alternating current is AC85V ~ 240V;
Full bridge inverter is under SPWM control circuit drives, according to input voltage automatic switchover output voltage and frequency: when being input as AC85V ~ 150V, inversion exports the sinusoidal voltage of 220V/50Hz, and when being input as AC160V ~ 240V, inversion exports the sinusoidal voltage of 110V/60Hz.
Advantage of the present invention: the present invention proposes one and can to automatically switch voltage and frequency, and has the Portable AC power supply change-over device of power factor correction (PFC) function.The main circuit of this power supply change-over device is two-layer configuration: prime is the Boost circuit with APFC function; Rear class is the full bridge inverter that can export according to the automatic switchover of input voltage grade.Prime Boost circuit adopts PWM to control, and the civilian electricity of wide region (AC85V ~ 240V) through over commutation is transformed into 400V direct current.Boost circuit is according to input voltage, input current and output dc voltage control switch pipe break-make, and making input current follow input voltage waveform is the change of sinusoidal rule, thus improves power factor, reduction harmonic content, reduces the pollution caused electrical network; Simultaneously by control switch tube current, the input power of restriction transducer, realizes overload protection.Rear class full bridge inverter adopts SPWM to control, and can automatically switch export according to the size of input voltage.When input voltage is AC85V ~ 150V, inversion exports 220V/50Hz alternating current; When input voltage is AC160V ~ 240V, inversion exports 110V/60Hz alternating current; Simultaneously by the output current of restriction inverter circuit, realize overload protection and short-circuit protection.
The present invention can realize the automatic conversion between existing common civil power 110V/60Hz and 220V/50Hz, and by adding Active Power Factor Correction (APFC) technology at input side, reduces the harmonic pollution caused electrical network.The present invention has the advantages such as input range is wide, voltage regulation is low, volume is little, and defencive function is complete simultaneously, and safety is easy-to-use.
Accompanying drawing explanation
Fig. 1 is the structural representation of AC power automatic transfer equipment of the present invention;
Fig. 2 is the structural representation of Boost circuit of the present invention;
Fig. 3 is the waveform schematic diagram of Boost circuit input voltage u, current i when normally working;
The waveform schematic diagram of input voltage u, current i when Fig. 4 is the action of Boost circuit Power Limitation;
Fig. 5 is the structural representation of full bridge inverter of the present invention;
Fig. 6 is SPWM control circuit input signal schematic diagram;
Fig. 7 is Unipolar SPWM modulation principle figure;
Fig. 8 is bipolar SPWM modulation principle figure.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, AC power automatic transfer equipment described in present embodiment, it comprises two-stage circuit, and prime is the Boost circuit with APFC function; Rear class is the full bridge inverter that can export according to the automatic switchover of input voltage grade, specifically comprises diode bridge rectifier circuit 1, pwm control circuit 2, accessory power supply 3, SPWM control circuit 4, full bridge inverter 5 and Boost circuit 6;
Civil power input is by exporting after diode bridge rectifier circuit 1 rectification, two inputs of Boost circuit 6 connect output terminals A and the output B of diode bridge rectifier circuit 1 respectively, are parallel with filter capacitor C between diode bridge rectifier circuit 1 output terminals A and output B
0, output C and the output D of Boost circuit 6 are connected two inputs of full bridge inverter 5 respectively, are parallel with electrochemical capacitor C between the output C of Boost circuit 6 and output D
bthe output E of full bridge inverter 5 is connected load with output F simultaneously, pwm control circuit 2 is for driving Boost circuit 6, SPWM control circuit 4 for driving full bridge inverter 5, and accessory power supply 3 is for providing low-voltage DC for AC power automatic transfer equipment;
Boost circuit 6 can receive the alternating current of wide region, and Boost circuit 6, can by the boosting of wide region alternating current for 400V direct current exports under pwm control circuit 2 drives; Described wide region alternating current is AC85V ~ 240V;
Full bridge inverter 5 is under SPWM control circuit 4 drives, according to input voltage automatic switchover output voltage and frequency: when being input as AC85V ~ 150V, inversion exports the sinusoidal voltage of 220V/50Hz, when being input as AC160V ~ 240V, inversion exports the sinusoidal voltage of 110V/60Hz.
In present embodiment, Boost circuit 6 also has APFC function, can reduce input side harmonic content, improves power factor, can control input current simultaneously, and restriction converter input power, realizes overload protection.
In present embodiment, full bridge inverter 5 can also control inverter output current, and the size of restriction converter output current, realizes overload protection and short-circuit protection; And detection can be carried out to output voltage to judge, realize overvoltage/undervoltage protection.
Embodiment two: present embodiment is described below in conjunction with Fig. 2-Fig. 4, present embodiment is described further execution mode one, and Boost circuit 6 comprises resistance R
1, resistance R
2, inductance L
b, switching tube Q, resistance R
3, diode VD, resistance R
4with resistance R
5;
Resistance R
1one end connect the output terminals A of diode bridge rectifier circuit 1, resistance R
2one end connect the output B of diode bridge rectifier circuit 1, resistance R
1the other end and resistance R
2the other end connect for sampled point M;
Inductance L
bone end connect the output terminals A of diode bridge rectifier circuit 1, inductance L
bthe drain electrode of other end connecting valve pipe Q, resistance R
3one end connect the output B of diode bridge rectifier circuit 1, resistance R
3the other end be connected for sampled point N with the source electrode of switching tube Q;
The anode of diode VD is connected to inductance L
bthe other end on, the negative electrode contact resistance R of diode VD
4one end, resistance R
5one end connect the output B of diode bridge rectifier circuit 1, resistance R
4the other end and resistance R
5the other end connect for sampled point P;
Pwm control circuit 2 produces PWM drive singal according to the output voltage of the input voltage of sampled point M, the input current of sampled point N and sampled point P, PWM drive singal is exported to the grid of switching tube Q.
In present embodiment, resistance R
1with resistance R
2for sampling to input voltage waveform; Sampling resistor R
3detection electric current is connected in series with switching tube Q; Divider resistance R
4and R
5boost circuit 6 output voltage is sampled; Pwm control circuit 2 exports according to three tunnel sampled signal adjustment and controls Boost circuit 6.
In present embodiment, Boost circuit 6 under the driving of pwm control circuit 2, by the output voltage U of diode bridge rectifier circuit 1
aBbring up to 400V (U
cD), realize Active Power Factor Correction (APFC) function simultaneously, reduce the harmonic content of input current, reduce electric network pollution.
In present embodiment, by the controlling of sampling of the electric current to sampled point N, limiting input current size, from the power of input side restriction power supply changeover device, realizes overload protection.
In present embodiment, composition graphs 3 and Fig. 4 are specifically described the APFC function of Boost circuit 6 and Power Limitation function: when AC power automatic transfer equipment of the present invention normally works, under the control of Boost circuit 6, input voltage u, input current i are with frequency homophase, be sine wave, have high power factor and low THD, input voltage u, input current i waveform are as shown in Figure 3.When power supply changeover device transships, described Boost circuit 6 just can limiting input current size, and input current i top flattens, and input power is limited; Now input voltage u and input current i keeps homophase, but input current THD raises, and input voltage u, current i waveform are as shown in Figure 4.
Embodiment three: present embodiment is described below in conjunction with Fig. 5, present embodiment is described further execution mode one, and full bridge inverter 5 comprises resistance R
s, switching tube Q
1, switching tube Q
2, switching tube Q
3, switching tube Q
4, inductance L and electric capacity C;
The output C connecting valve pipe Q simultaneously of Boost circuit 6
1drain electrode and switching tube Q
2drain electrode, the output D contact resistance R of Boost circuit 6
sone end, resistance R
sthe other end, switching tube Q
3source electrode and switching tube Q
4source electrode connect for sampled point O simultaneously, switching tube Q
1source electrode and switching tube Q
3drain electrode connect for node G, switching tube Q
2source electrode and switching tube Q
4drain electrode connect for output F, one end connected node G of inductance L, the other end of inductance L is output E, is connected in parallel electric capacity C between output E and output F;
The P1 control end connecting valve pipe Q of SPWM control circuit 4
1grid, the P2 control end connecting valve pipe Q of SPWM control circuit 4
2grid, the P3 control end connecting valve pipe Q of SPWM control circuit 4
3grid, the P4 control end connecting valve pipe Q of SPWM control circuit 4
4grid;
SPWM control circuit 4 is according to frequency control signal Frq and voltage feedback signal V
fadjustment driver output controls full bridge inverter 5.
In present embodiment, SPWM control circuit 4 carries out controlling of sampling (sampled point O) to full bridge inverter 5 output current simultaneously.When output current is excessive, there is protection act in SPWM control circuit 4, stops the driver output of full bridge inverter 5, thus limit the power of power supply changeover device at outlet side; Simultaneously current response fast, can make AC power automatic transfer equipment rapidly action occur in a short-circuit situation, realize overload protection and short-circuit protection.
In present embodiment, SPWM control circuit 4 pairs of inverter output voltages judge (voltage feedback signal V
f), when output voltage is too high or too low, SPWM control circuit 4 quits work, and enters overvoltage/undervoltage guard mode.
Below in conjunction with Fig. 6 to the frequency control signal Frq of SPWM control circuit 4 and voltage feedback signal V
fbe specifically described:
Resistance R
6, R
7, R
8with diode VD
2, electric capacity C
1composition sampling hold circuit, detects the electric pressure of civil power input; Comparator U
1Aoutput as frequency control signal Frq, comparator U
1Boutput drive triode Q
5in order to control algorithm amplifier U
3power supply; Divider resistance R
20, R
21inverter output voltage is sampled, operational amplifier U
2, U
3place circuit carries out amplification to sampled voltage and compensates as voltage feedback signal V
f.SPWM control circuit 4 is according to Frq and V
fadjustment driver output controls full bridge inverter.
When input voltage is AC85V ~ 150V, comparator U
1Aoutput low level, namely frequency control signal Frq is " 0 ", then SPWM control circuit 4 adopts 50Hz modulating wave; Comparator U simultaneously
1Bexport high level, triode Q
5conducting, operational amplifier U
3because power ground does not work, now voltage feedback signal V
fequal W point current potential, full bridge inverter 5 exports 220V/50Hz alternating current under the driving of SPWM control circuit 4.When input voltage is AC160V ~ 240V, comparator U
1Aexport high level, namely frequency control signal Frq is " 1 ", and SPWM control circuit 4 adopts 60Hz modulating wave; Comparator U simultaneously
1Boutput low level, triode Q
5turn off, operational amplifier U
3work, now voltage feedback signal V
fequal the twice of W point current potential, full bridge inverter 5 output voltage under the driving of SPWM control circuit 4 reduces, and exports 110V/60Hz alternating current.
Embodiment four: present embodiment is described below in conjunction with Fig. 7, present embodiment is described further execution mode one, and the modulation system of SPWM control circuit 4 is: unipolarity is modulated.
In present embodiment, according to Frq and V
fchange sinusoidal modulation wave u
mfrequency and amplitude regulate SPWM drive singal, drive the switching tube Q of full bridge inverter 5 with this
1, Q
2, Q
3and Q
4.The voltage U between output G, output F of described full bridge inverter 5
gFfor the SPWM waveform of correspondence, through voltage U between LC filtering output end E, output F
eFfor sine wave, its output E, output F connect load.
Embodiment five: present embodiment is described below in conjunction with Fig. 8, present embodiment is described further execution mode one, and the modulation system of SPWM control circuit 4 is: bipolar modulation.
In the present invention, its prime is the Boost circuit with APFC function, and rear class is the full bridge inverter that can export according to the automatic switchover of input voltage grade; Adopt two-stage circuit structure, under Same Efficieney magnitude, during 110V input, realize overload protection by prime current limliting, during 220V input, realize overload protection and short-circuit protection by rear class current limliting.
In the present invention, AC power automatic transfer equipment can by identifying input voltage grade, and adjustment full bridge inverter 5 output voltage and frequency, realize the automatic conversion between 110V/60Hz and 220V/50Hz two kinds of alternating currents.
In the present invention, input side introduces Active Power Factor Correction (APFC) technology based on Boost topology, at suppression current on line side harmonic wave while improving power factor, for rear class full bridge inverter 5 provides enough DC input voitage, to meet the requirement of inverter output voltage stability contorting.
Claims (5)
1. AC power automatic transfer equipment, is characterized in that, it comprises two-stage circuit, and prime is the Boost circuit with APFC function; Rear class is the full bridge inverter that can export according to the automatic switchover of input voltage grade, specifically comprises diode bridge rectifier circuit (1), pwm control circuit (2), accessory power supply (3), SPWM control circuit (4), full bridge inverter (5) and Boost circuit (6);
Civil power input is by exporting after diode bridge rectifier circuit (1) rectification, two inputs of Boost circuit (6) connect output terminals A and the output B of diode bridge rectifier circuit (1) respectively, are parallel with filter capacitor C between diode bridge rectifier circuit (1) output terminals A and output B
0, output C and the output D of Boost circuit (6) are connected two inputs of full bridge inverter (5) respectively, are parallel with electrochemical capacitor C between the output C of Boost circuit (6) and output D
bthe output E of full bridge inverter (5) is connected load with output F simultaneously, pwm control circuit (2) is for driving Boost circuit (6), SPWM control circuit (4) is for driving full bridge inverter (5), and accessory power supply (3) is for providing low-voltage DC for AC power automatic transfer equipment;
Boost circuit (6) can receive the alternating current of wide region, and Boost circuit (6), can by the boosting of wide region alternating current for 400V direct current exports under pwm control circuit (2) drives; Described wide region alternating current is AC85V ~ 240V;
Full bridge inverter (5) is under SPWM control circuit (4) drives, according to input voltage automatic switchover output voltage and frequency: when being input as AC85V ~ 150V, inversion exports the sinusoidal voltage of 220V/50Hz, when being input as AC160V ~ 240V, inversion exports the sinusoidal voltage of 110V/60Hz.
2. AC power automatic transfer equipment according to claim 1, is characterized in that, Boost circuit (6) comprises resistance R
1, resistance R
2, inductance L
b, switching tube Q, resistance R
3, diode VD, electric capacity C
b, resistance R
4with resistance R
5;
Resistance R
1one end connect diode bridge rectifier circuit (1) output terminals A, resistance R
2one end connect diode bridge rectifier circuit (1) output B, resistance R
1the other end and resistance R
2the other end connect for sampled point M;
Inductance L
bone end connect diode bridge rectifier circuit (1) output terminals A, inductance L
bthe drain electrode of other end connecting valve pipe Q, resistance R
3one end connect diode bridge rectifier circuit (1) output B, resistance R
3the other end be connected for sampled point N with the source electrode of switching tube Q;
The anode of diode VD is connected to inductance L
bthe other end on, the negative electrode contact resistance R of diode VD
4one end, resistance R
5one end connect diode bridge rectifier circuit (1) output B, resistance R
4the other end and resistance R
5the other end connect for sampled point P;
Pwm control circuit (2) produces PWM drive singal according to the output voltage of the input voltage of sampled point M, the input current of sampled point N and sampled point P, PWM drive singal is exported to the grid of switching tube Q.
3. AC power automatic transfer equipment according to claim 1, is characterized in that, full bridge inverter (5) comprises resistance R
s, switching tube Q
1, switching tube Q
2, switching tube Q
3, switching tube Q
4, inductance L and electric capacity C;
The output C connecting valve pipe Q simultaneously of Boost circuit (6)
1drain electrode and switching tube Q
2drain electrode, the output D contact resistance R of Boost circuit (6)
sone end, resistance R
sthe other end, switching tube Q
3source electrode and switching tube Q
4source electrode connect for sampled point O simultaneously, switching tube Q
1source electrode and switching tube Q
3drain electrode connect for node G, switching tube Q
2source electrode and switching tube Q
4drain electrode connect for output F, one end connected node G of inductance L, the other end of inductance L is output E, is connected in parallel electric capacity C between output E and output F;
The P1 control end connecting valve pipe Q of SPWM control circuit (4)
1grid, the P2 control end connecting valve pipe Q of SPWM control circuit (4)
2grid, the P3 control end connecting valve pipe Q of SPWM control circuit (4)
3grid, the P4 control end connecting valve pipe Q of SPWM control circuit (4)
4grid;
SPWM control circuit (4) is according to frequency control signal Frq and voltage feedback signal V
fadjustment driver output controls full bridge inverter (5).
4. AC power automatic transfer equipment according to claim 3, is characterized in that, the modulation system of SPWM control circuit (4) is: unipolarity is modulated.
5. AC power automatic transfer equipment according to claim 3, is characterized in that, the modulation system of SPWM control circuit (4) is: bipolar modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510474960.6A CN105024560A (en) | 2015-08-05 | 2015-08-05 | Automatic conversion device of alternating current power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510474960.6A CN105024560A (en) | 2015-08-05 | 2015-08-05 | Automatic conversion device of alternating current power supply |
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|---|---|
| CN105024560A true CN105024560A (en) | 2015-11-04 |
Family
ID=54414328
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| CN201510474960.6A Pending CN105024560A (en) | 2015-08-05 | 2015-08-05 | Automatic conversion device of alternating current power supply |
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| CN105576995A (en) * | 2016-02-01 | 2016-05-11 | 兰州智豆信息科技有限公司 | Random curve change type digital alternating current voltage stabilized power supply |
| CN105909447A (en) * | 2016-05-31 | 2016-08-31 | 盐城杰精机械制造有限公司 | Starting motor applicable to global voltages |
| CN108123607A (en) * | 2018-01-03 | 2018-06-05 | 常州同惠电子股份有限公司 | Alternating current automatic switching control equipment based on voltage method |
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Application publication date: 20151104 |