CN103997053B - Energy in bidirectional flow EPS - Google Patents
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Abstract
The present invention is energy in bidirectional flow EPS, and the storage battery solving existing EPS needs independently charger, and the progression of system power conversion is many, the efficiency of inverter and the problem of poor reliability.As the back-up source powering load of voltage Grid after storage battery is connected with the interior high frequency ring without DC link, interior high frequency ring is made up of high-frequency inverter, high frequency transformer, frequency converter, filter, and storage battery, electrical network are connected with dsp processor respectively by first, second and third sampling modulate circuit with load; Dsp processor connects first and second drive circuit, communication interface circuit respectively, and communication interface circuit is connected with man-machine interaction; First and second drive circuit is connected with high-frequency inverter, frequency converter respectively, and described dsp processor obtains system mode by conditioning sample circuit, to be connected the flow direction to control energy by drive circuit with interior high frequency ring.
Description
technical field:
The present invention relates to a kind of EPS adopting the two-way flow circuit of interior high frequency ring.
technical background:
Electric power system, due to the uncertainty of itself, has the possibility of power-off at any time.For some special equipment (medicine equipment, communication equipment, emergent indicator light) or some special occasions (as railway station, square, large buildings and elevator apartment etc.), once power-off, likely bring massive losses or lead to serious accident, EPS, as stand-by power supply, well solves this problem.
EPS technology grows up along with power electronic technology and computer control system, using storage battery as energy storage device, electrical network under normal circumstances, electrical network powering load also charges a battery, when EPS detects that line voltage is abnormal, be switched to EPS inversion power supply state, storage battery electric energy is converted to industrial-frequency alternating current through EPS, to load emergency service.
Traditional EPS common are three kinds: 1, discharge and recharge adopts charger and inverter two power conversion circuits, and the complicated and energy of this type of system hardware structure can not two-way flow; 2, adopt the energy in bidirectional flow circuit of Industrial Frequency Transformer, this type systematic due to the volume of Industrial Frequency Transformer, weight greatly also cause that the volume of system, weight are large and cost is high, heavy and audio-frequency noise is large; 3, adopt the two-way flow circuit of interior high frequency ring, but its commutation circuit is complicated, adopts multiple relay and rectifier bridge jointly to complete, system configuration complexity and volume are increased.
summary of the invention:
The object of this invention is to provide a kind of structure simple, volume is little, do not need charge independence device, system switching circuit is simple, power network current voltage is by interior high frequency ring reverse operation, pulse charging is carried out to storage battery, controls simple and the useful life of storage battery and the energy in bidirectional flow EPS of efficiency can be improved.
The present invention is achieved in that
Energy in bidirectional flow EPS, as the back-up source powering load of voltage Grid after storage battery is connected with the interior high frequency ring without DC link, interior high frequency ring is made up of high-frequency inverter, high frequency transformer, frequency converter, filter, and storage battery, electrical network are connected with dsp processor respectively by first, second and third sampling modulate circuit with load; Dsp processor connects first and second drive circuit, communication interface circuit respectively, and communication interface circuit is connected with man-machine interaction; First and second drive circuit is connected with high-frequency inverter, frequency converter respectively, described dsp processor obtains system mode by conditioning sample circuit: whether electrical network is normal, whether load is normal, and battery condition, to be connected the flow direction to control energy by drive circuit with interior high frequency ring.
High frequency transformer is by first, two power tubes are formed recommends full wave type circuit and high frequency transformer former limit winding switching, storage battery just, negative pole is connected to first, the mid point of two power tube collector electrodes and high frequency transformer former limit winding, frequency converter is by the 3rd, 4th, 5th, 6th power tube forms half-bridge full wave type circuit, each anti-also the first-the six diode of the first-the six power tube is to realize the two-way flow of energy, the base stage of each power tube is connected with dsp processor by drive circuit, half-bridge full wave type circuit is connected to the first input end of high frequency transformer vice-side winding and filter, high frequency transformer vice-side winding mid point is connected to the second input of filter, the output of filter is connected with load and electrical network by the first switch S 1, load and electrical network have second switch S2 respectively, 3rd switch S 3.First, second and third switch S 1, S2, S3 are relay, be connected with dsp processor, the normally opened contact of the first switch S 1 connects filter, and when needing the first switch S 1 to close, dsp processor sends a signal and makes relay coil be adsorbed onto normally opened contact then to connect storage battery.The normally-closed contact of second switch S2 is connected with electrical network, and when electrical network is abnormal, dsp processor sends signal and relay coil is adsorbed onto normally opened contact namely cuts away electrical network.The normally-closed contact of the 3rd switch S 3 is connected with load, and when load faulty, dsp processor sends signal and relay coil is adsorbed onto normally opened contact and disconnecting consumers.
Described dsp processor adopts the TMS320F2809 chip of TI company.
The output of described drive circuit isolates amplification rear drive triode to pipe by optocoupler TLP250, driving power circuit.
The signal deteching circuit of described first sampling modulate circuit belongs to the large electric resistance partial pressure of DC side in storage battery side, the mode of small resistor shunting detects battery tension, current signal, second and third sampling modulate circuit belongs to AC in grid side and load-side and adopts instrument transformer to carry out detection of grid voltage and load current respectively, then the signal voltage detected, current signal is passed to first, second and third sampling modulate circuit and is carried out processing the AD thief hatch amplifying and pass to DSP after adder lifting again.
Described sampling modulate circuit sends into after measured signal is carried out differential amplification after adder promotes to pass to AD thief hatch.
When energy flows to load from storage battery, namely high frequency ring forward work in: after dsp processor judges that electrical network needs storage battery power supply extremely, dsp processor controls second switch S2 and disconnects, first switch S 1 and the 3rd switch S 3 close, storage battery is as power supply powering load, open the first power tube V1, then primary voltage of transformer U1 obtains negative value, open the second power tube V2, then primary voltage of transformer U1 obtain on the occasion of, so only need by the switching first of drive circuit high frequency, two power tube V1, V2 then can convert direct voltage to high-frequency ac voltage, at high frequency transformer secondary, alternating current just can be become the SPWM signal of power frequency by the control carried out the 3rd-six power tube V3 ~ V6, be implemented as follows: secondary voltage U2 is timing, 3rd power tube V3 conducting, obtain positive voltage, U2 is for time negative, 5th power tube V5 conducting, obtain positive voltage, so control the 3rd by drive circuit, five power tube V3, V5 alternate conduction just can obtain the positive half cycle of SPWM, in like manner U2 is timing, 6th power tube V6 conducting, obtain negative voltage, U2 is for time negative, and the 4th power tube V4 conducting, obtains negative voltage, alternate conduction the 4th, six power tube V4, V6 just can obtain the negative half period of SPWM, the conducting of dsp processor control the 3rd-six power tube V3 ~ V6 just can obtain required SPWM ripple as required, obtains simple alternating current supply load after filter filtering
When energy flows to storage battery from electrical network, namely high frequency ring reverse operation in: dsp processor judges that system electrical network is normal and after the charging of storage battery needs, dsp processor controls first, second and third switch S 1, S2, S3 are all closed, first electrical network sine wave is become high-frequency ac ripple, concrete methods of realizing is: when sine wave is at positive half cycle, if the 5th power tube V5 is open-minded, then electrical network-transformer T-the 5th power tube V5-the 6th diode VD6 forms loop, obtains positive U2, if the 3rd power tube V3 is open-minded, then electrical network-transformer T-the 3rd power tube V3-the 4th diode VD4 forms loop, obtain the U2 born, when sine wave is at negative half period, if open the 4th power tube V4, then electrical network-four power tube V4-the 3rd diode VD3-transformer T forms loop, obtains positive U2, if open the 6th power tube V6, electrical network-the 6th power tube V6-the 5th diode VD5-transformer T forms loop, obtain the U2 born, therefore sinusoidal wave timing, 3rd, five power tube V3, V5 alternate conduction, when sine wave is negative, 4th, six power tube V4, V6 alternate conduction just becomes electrical network sine wave the alternating current of high frequency, again by first after high frequency transformer, two diode VD1, VD2 is rectified into DC pulse and charges a battery, namely U1 timing is charged a battery by the second diode VD2, U1 is for charging a battery by the first diode VD1 time negative, require when pulse charging method charges a battery that pulse fills electric then have a rest a little while to prevent the polarization of storage battery, this ON time by drive circuit control the three-the six power tube V3 ~ V6 and duty ratio realize controlling.
The time ratio of having a rest that fills of storage battery is 4: 1, then the duty ratio arranging V3 ~ V6 is 0.8.
When line voltage is greater than 240V or is less than 220V or mains frequency deviation is greater than 1Hz, then think that electrical network is abnormal; Lower than final discharging voltage, battery tension then thinks that it can not discharge; Single rated voltage is the storage battery of 12V, and battery voltage is that n × (12.8 ~ 13.1V) then thinks that it need not charge; Then think that it is full of when accumulator battery voltage reaches its end of charge voltage, end of charge voltage is n × (13.8 ~ 14.5V), n higher than rated voltage is the storage battery number of elements of connecting; Operating state has 5 kinds:
When the normal and storage battery of electrical network needs to enter operating state 1 during charging: now require all closed conducting of first, second and third switch S 1, S2, S3, electrical network provides energy to load, is charged a battery by interior high frequency ring reverse operation simultaneously.Under this state dsp processor need to control third and fourth, five, six power tube V3, V4, V5, V6, line voltage is timing, three, five power tube V3, V5 traffic conductings, line voltage is for time negative, four, six power tube V4, V6 alternate conduction, then be rectified into DC pulse through first and second diode VD1, VD2 and charge a battery.
When electrical network is normal, but accumulator electric-quantity abundance does not need to enter operating state 2 during charging: now disconnect the first switch S 1 by dsp processor, closed second switch S2 and the 3rd switch S 3, electrical network only provides energy with to load.
When electrical network is abnormal, operating state 3 is entered: now disconnect second switch S2 during storage battery powering load, cut off electrical network, closed first and third switch S 1, S3, EPS forward works, and dsp processor controls first and second power tube V1, V2 alternate conduction, and DC inversion is become high-frequency ac, alternate conduction the 3rd, five power tube V3, V5 obtains the positive half cycle of SPWM ripple again, and alternate conduction fourth, fifth power tube V4, V6 obtain the negative half period of SPWM ripple.
Then enter operating state 4 when electrical network is abnormal and accumulator electric-quantity is too low: now control first and second switch S 1 by dsp processor, S2 disconnects, continue detection of grid state, after power system restoration is normal, then switch to operating state 1.
Then enter operating state 5 when load faulty: now control the 3rd switch S 3 by dsp processor and disconnect, continue to detect load condition, until load restoration normal after proceed to other operating states.
Energy capable of bidirectional flowing EPS have employed the interior high frequency ring without DC link, adopts high frequency transformer, reduces the volume and weight of potential device.And due to without DC link, so power can transmitted in both directions, also reduce the progression of power conversion, this serves key effect to the efficiency and reliability that improve inverter further simultaneously.And because energy can be reverse in native system, can direct DC pulse charge a battery, compared with traditional E PS, not only reduce to the charger of back-up source charging, make hardware configuration simply outside, and adopt pulse charging method to charge a battery, while improve the charge efficiency of storage battery, also can strengthen the useful life of storage battery.For software control, traditional EPS commutation circuit is complicated, and relay switch is too much, and needs to control charger, and the charging process of storage battery is inherently very complicated, also makes control software design become complicated.In the present invention, commutation circuit only has three relay switches to make to control simply, and due to adopt be that pulse charging method is charged to storage battery, only need the power tube in control inverter that fundamental frequency alternating current is become the alternating-current pulse of high frequency, then alternating-current pulse can become DC pulse through over commutation.So only should be noted DC pulse in controlling fill the time of having a rest than the alternate conduction controlling several power tube, these are simply many compared with the control of traditional storage battery charger.
accompanying drawing illustrates:
Fig. 1 is system architecture diagram schematic diagram of the present invention.
Fig. 2 is the structural representation of power main circuit of the present invention.
Fig. 3 is the first sampling modulate circuit topological diagram.
Fig. 4 is the second sampling modulate circuit topological diagram.
Fig. 5 is the 3rd sampling modulate circuit topological diagram.
Fig. 6 is the first drive circuit topological diagram.
Fig. 7 is the second drive circuit topological diagram.
Fig. 8 is the program control block diagram of native system.
embodiment:
The specific embodiments of present system:
As shown in Figure 1, what wherein high-frequency inverter was made up of V1, V2 recommends full wave type circuit to the power main circuit of present system, and V1, V2 distinguish parallel connection diode VD1, VD2.In power main circuit, the model of power tube V1 ~ V6 is IKW40T120.The operation principle of power main loop is specific as follows:
When energy flows to load from storage battery, high frequency ring forward work namely: S2 disconnects, S1 and S3 closes.Storage battery, as power supply powering load, opens V1, then primary voltage of transformer U1 obtains negative value; Open V2, then primary voltage of transformer U1 obtain on the occasion of, so only then direct voltage need can be converted to high-frequency ac voltage by switching V1, V2 of drive circuit high frequency.At high frequency transformer secondary, the SPWM signal that alternating current just can be become power frequency by suitable control is carried out to V3 ~ V6.Be implemented as follows: U2 is timing, and V3 conducting, obtains positive voltage, U2 is for time negative, and V5 conducting, obtains positive voltage, so just can be obtained the positive half cycle of SPWM by drive circuit control V3, V5 alternate conduction; In like manner U2 is timing, and V6 conducting, obtains negative voltage, and U2 is for time negative, and V4 conducting, obtains negative voltage, and alternate conduction V4, V6 just can obtain the negative half period of SPWM.As long as so the conducting of control V3 ~ V6 just can obtain required SPWM ripple as required, obtain simple alternating current supply load after filter filtering.
When energy flows to storage battery from electrical network, high frequency ring reverse operation namely: S1, S2, S3 are all closed, first becomes electrical network sine wave into high-frequency ac ripple.Concrete methods of realizing is: when sine wave is at positive half cycle, if V5 is open-minded, then electrical network-transformer T-V5-VD6 forms loop, obtains positive U2; If V3 is open-minded, then electrical network-transformer T-V3-VD4 forms loop, obtains the U2 born.When sine wave is at negative half period, if open V4, then electrical network-V4-VD3-transformer T forms loop, obtains positive U2; If open V6, electrical network-V6-VD5-transformer T forms loop, obtains the U2 born.Therefore sinusoidal wave timing, V3, V5 alternate conduction, when sine wave is negative, V4, V6 alternate conduction just becomes electrical network sine wave the alternating current of high frequency.After high frequency transformer, be rectified into DC pulse by VD1, VD2 again charge a battery.Namely U1 timing is charged a battery by VD2, and U1 is for charging a battery by VD1 time negative.Then have a rest is to prevent the polarization of storage battery to require pulse to fill electricity a little while when pulse charging method charges a battery, and this ON time by drive circuit control V3 ~ V6 tetra-power tubes and duty ratio realize controlling.
Control circuit then comprises dsp processor, signal deteching circuit, sampling modulate circuit, drive circuit, communication interface circuit and man-machine interaction.Concrete scheme is as follows:
The TMS320F2809 of the TI company that described dsp processor adopts is the core devices of control circuit, is responsible for the signal collected to carry out calculation process, then produces corresponding control signal according to control algolithm.Aboundresources on this chip slapper, have built-in AD conversion module and PWM output module, this chip is particularly useful for the control of the power electronic equipment under complex work environment.Line voltage, phase place that transducer collection comes, battery tension, electric current and load current, after the signal sample circuit that operational amplifier forms, are connected with the AD conversion mouth of DSP and carry out AD sampling.The pwm signal that DSP exports is connected with interior high frequency ring through overdrive circuit, realizes the control of 6 power tubes in internal high frequency ring.
Described signal deteching circuit belongs to the large electric resistance partial pressure of DC side in storage battery side, and the mode of small resistor shunting detects storage battery signal, belongs to AC adopt instrument transformer to detect respectively in grid side and load-side.Then the signal detected is passed to the AD thief hatch passing to DSP after sampling modulate circuit processes again.
Described sampling modulate circuit is divided into the first sampling modulate circuit (as shown in Figure 3), the second sampling modulate circuit (as shown in Figure 4) and the 3rd sampling modulate circuit (as shown in Figure 5).Wherein battery current and load current flow through resistance and are converted to voltage signal BATCUR+, BATCUR-and LOADCUR+, LOADCUR-, amplifier via amplifier TL074C design amplifies certain multiple, then superpose+a 1.5V, then send into the AD thief hatch of DSP after the voltage follower formed by TL074C and BAT54S device amplitude limit (0 ~ 3.0V).Electrical network zero passage detection: mains voltage signal VLINEL, VLINEN, the amplifier via amplifier TL074C design amplifies certain multiple, then the hysteresis comparator by being made up of LM393, after line voltage zero passage, produce a pulse signal, and inputs DSP detection.In like manner: cell voltage and mains voltage signal BATV+, BATV-and VLINEL, VLINEN, amplifier via amplifier TL074C design amplifies certain multiple, then superpose+a 1.5V, then send into the AD thief hatch of DSP after the voltage follower formed by TL074C and BAT54S device amplitude limit (0 ~ 3.0V).
As shown in Figure 6, driving power signal H.F.PWM+, H.F.PWM-, after pulse transformer, then produce by filtering and voltage-stabiliser tube D3, D4 the voltage opened (+16V) and turn off needed for (-12V) to described first drive circuit; Described second drive circuit as shown in Figure 7, DSP produce pwm signal by optocoupler TLP250 controls Q1, Q2 form to pipe, send opening and turning off control signal of power switch pipe.In native system, total V1 ~ V6 six power tubes need to control, so one has six drive circuits.No matter be that forward runs or inverted running all requires V3 and V5, V4 and V6 alternate conduction during system cloud gray model, so V3 and V5, also to the drive singal of V4 and V6 this alternately occur, the drive singal of V3 and V5 in control, V4 and V6 adopts complementary signal to carry out control realization.
Described communication interface circuit utilizes RS485 to realize communication, by dsp processor
Chip TMS320F2809 and human-computer interaction interface link up realize showing, press key lamp function.And interface circuit has by optical coupling isolation circuit filtering interfering, increases driving force by triode.
Technique scheme realizes the specific procedure control block diagram of energy in bidirectional flow as shown in Figure 8, wherein when line voltage is greater than 240V or be less than 220V or mains frequency deviation is greater than 1Hz, then thinks that electrical network is abnormal; Lower than discharge off, battery tension then thinks that it can not discharge, rated voltage is that its final discharging voltage of storage battery of 12V is generally n × 10.5V (n is the lead acid accumulator number of elements of series connection); Rated voltage is the storage battery of 12V, and its voltage is that n × (12.8 ~ 13.1V) then thinks that it need not charge; Then think that it is full of when battery tension reaches its end of charge voltage, end of charge voltage is generally n × (13.8 ~ 14.5V) (n is the lead acid accumulator number of elements of series connection) higher than rated voltage (single 12V).The prevailing operating state of present system has 5 kinds accordingly:
When the normal and storage battery of electrical network needs to enter operating state 1 during charging: now require all closed conducting of S1, S2, S3, electrical network provides energy to load, is charged a battery by interior high frequency ring reverse operation simultaneously.Need control V3, V4, V5, V6 tetra-power tubes under this state, line voltage is timing, V3, V5 traffic conducting, line voltage for time negative, V4, V6 alternate conduction, then be rectified into DC pulse through VD1, VD2 and charge a battery.
When electrical network is normal, but accumulator electric-quantity abundance does not need to enter operating state 2 during charging: now disconnect S1 by software, closed S2 and S3, electrical network only provides energy with to load.
When electrical network is abnormal, enter operating state 3: now disconnect S2 during storage battery powering load, cut off electrical network, closed S1, S3, EPS forward works.Control V1, V2 alternate conduction, becomes high-frequency ac DC inversion, then alternate conduction V3, V5 obtain the positive half cycle of SPWM ripple, and alternate conduction V4, V6 obtain the negative half period of SPWM ripple.
Operating state 4 is then entered: now disconnected by dsp processor control switch S1, S2 when electrical network is abnormal and accumulator electric-quantity is too low.Continue detection of grid state, after power system restoration is normal, then switch to operating state 1.
Then enter operating state 5 when load faulty: is now disconnected by dsp processor control switch S3, continue to detect load condition, until load restoration normally after proceed to other operating states.
First, second and third switch S 1, S2, S3 are relay, and model is JW1FSN24V, is connected with dsp processor.The normally opened contact of the first switch S 1 connects filter, and when needing the first switch S 1 to close, dsp processor sends a signal and makes relay coil be adsorbed onto normally opened contact then to connect storage battery.The normally-closed contact of second switch S2 is connected with electrical network, and when electrical network is abnormal, dsp processor sends signal and relay coil is adsorbed onto normally opened contact namely cuts away electrical network.The normally-closed contact of the 3rd switch S 3 is connected with load, and when load faulty, dsp processor sends signal and relay coil is adsorbed onto normally opened contact and disconnecting consumers.
Claims (1)
1. energy in bidirectional flow EPS, it is characterized in that storage battery after being connected with the interior high frequency ring without DC link as the back-up source powering load of voltage Grid, interior high frequency ring is by high-frequency inverter, high frequency transformer, frequency converter, filter forms, storage battery, electrical network and load are respectively by first, two, three sampling modulate circuits are connected with dsp processor, dsp processor connects first respectively, two drive circuits, communication interface circuit, communication interface circuit is connected with man-machine interaction, first, two drive circuits respectively with high-frequency inverter, frequency converter connects, described dsp processor obtains system mode by the first to the 3rd sampling modulate circuit: whether electrical network is normal, whether load is normal, and battery condition, the flow direction to control energy is connected with interior high frequency ring by the first and second drive circuits, high-frequency inverter is by first, two power tube V1, V2 formation recommends full wave type circuit and high frequency transformer former limit winding switching, bearing of storage battery, positive pole is connected to first, two power tube V1, the mid point of V2 collector electrode and high frequency transformer former limit winding, frequency converter is by the 3rd, 4th, 5th, 6th power tube V3-V6 forms half-bridge full wave type circuit, each anti-also the first to the 6th diode VD1-VD6 of first to the 6th power tube V1-V6 is to realize the two-way flow of energy, the base stage of each power tube is connected with dsp processor by the first or second drive circuit, half-bridge full wave type circuit is connected to the first input end of high frequency transformer vice-side winding and filter, high frequency transformer vice-side winding mid point is connected to the second input of filter, the output of filter is connected with load and electrical network by the first switch S 1, load and electrical network are respectively equipped with the 3rd switch S 3, second switch S2, first, two, three switch S 1, S2, S3 is relay, be connected with dsp processor respectively, the normally opened contact of the first switch S 1 connects filter, when needing the first switch S 1 to close, dsp processor sends a signal and makes relay coil be adsorbed onto normally opened contact then to connect storage battery, the normally-closed contact of second switch S2 is connected with electrical network, when electrical network is abnormal, dsp processor sends signal and relay coil is adsorbed onto normally opened contact namely cuts away electrical network, the normally-closed contact of the 3rd switch S 3 is connected with load, when load faulty, dsp processor sends signal and relay coil is adsorbed onto normally opened contact and disconnecting consumers, described dsp processor adopts the TMS320F2809 chip of TI company, described first, the output of two drive circuits isolates each power tube of amplification rear drive by optocoupler TLP250, the signal deteching circuit of described first sampling modulate circuit is at the large electric resistance partial pressure in storage battery side, the mode of small resistor shunting detects battery tension, current signal, second, three sampling modulate circuits adopt instrument transformer to carry out detection of grid voltage and load current in grid side and load-side respectively, then the voltage will detected, current signal passes to first, two, three sampling modulate circuits carry out processing the AD thief hatch amplifying and pass to dsp processor after adder lifting again, described first to the 3rd sampling modulate circuit sends into after measured signal is carried out differential amplification after adder promotes to pass to AD thief hatch, when energy flows to load from storage battery, namely high frequency ring forward work in: after dsp processor is judged that electrical network is abnormal and needed storage battery power supply, control second switch S2 to disconnect, first switch S 1 and the 3rd switch S 3 close, storage battery is as power supply powering load, first is switched by the first drive circuit high frequency, two power tube V1, V2 then can convert direct voltage to high-frequency ac voltage, at high frequency transformer secondary, carry out SPWM to the 3rd to the 6th power tube V3 ~ V6 to control high-frequency alternating current to become industrial-frequency alternating current, be implemented as follows: control the 3rd by the second drive circuit, five power tube V3, V5 alternate conduction just can obtain the positive half cycle of SPWM ripple, alternate conduction the 4th, six power tube V4, V6 just can obtain the negative half period of SPWM ripple, and the conducting controlling the 3rd to the 6th power tube V3 ~ V6 as required just can obtain required SPWM ripple, obtains simple alternating current supply load after filter filtering,
When energy flows to storage battery from electrical network, namely high frequency ring reverse operation in: dsp processor judges that electrical network is normal and storage battery controls first after needing charging, two, three switch S 1, S2, S3 is all closed, electrical network is sinusoidal wave when positive half cycle, 3rd, five power tube V3, V5 alternate conduction, electrical network is sinusoidal wave when negative half period, 4th, six power tube V4, V6 alternate conduction just becomes electrical network sine wave the alternating current of high frequency, again by first after high frequency transformer, two diode VD1, VD2 is rectified into DC pulse and charges a battery, require when pulse charging method charges a battery that pulse fills electric then have a rest a little while to prevent the polarization of storage battery, this ON time by second drive circuit control the 3rd to the 6th power tube V3 ~ V6 and duty ratio realize controlling, the time of having a rest of filling of storage battery compares for 4:1, the duty ratio then arranging the 3rd to the 6th power tube V3 ~ V6 is 0.8, when line voltage is greater than 240V or is less than 220V or mains frequency deviation is greater than 1Hz, then think that electrical network is abnormal, lower than final discharging voltage, battery tension then thinks that it can not discharge, for the storage battery that n only connects, wherein single storage battery rated voltage is 12V, and battery voltage is that n (12.8 ~ 13.1) V then thinks that it need not charge, then think that it is full of when accumulator battery voltage reaches its end of charge voltage, end of charge voltage is higher than rated voltage, and be n (13.8 ~ 14.5) V, operating state has 5 kinds:
When the normal and storage battery of electrical network needs to enter operating state 1 during charging: now require all closed conducting of first, second and third switch S 1, S2, S3, electrical network provides energy to load, is charged a battery by interior high frequency ring reverse operation simultaneously,
When electrical network is normal, but accumulator electric-quantity abundance does not need to enter operating state 2 during charging: now disconnect the first switch S 1 by dsp processor, closed second switch S2 and the 3rd switch S 3, electrical network only provides energy with to load,
When electrical network is abnormal, enter operating state 3 during storage battery powering load: now disconnect second switch S2, cut off electrical network, closed first and third switch S 1, S3, EPS forward works,
Then enter operating state 4 when electrical network is abnormal and accumulator electric-quantity is too low: now control first and second switch S 1 by dsp processor, S2 disconnects, continue detection of grid state, after power system restoration is normal, then switch to operating state 1,
Then enter operating state 5 when load faulty: now control the 3rd switch S 3 by dsp processor and disconnect, continue to detect load condition, until load restoration normal after proceed to other operating states.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410259844.8A CN103997053B (en) | 2014-06-12 | 2014-06-12 | Energy in bidirectional flow EPS |
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| CN201410259844.8A CN103997053B (en) | 2014-06-12 | 2014-06-12 | Energy in bidirectional flow EPS |
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| CN103997053A CN103997053A (en) | 2014-08-20 |
| CN103997053B true CN103997053B (en) | 2015-09-16 |
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| CN105790431B (en) * | 2016-05-06 | 2018-06-19 | 深圳市盛弘电气股份有限公司 | A kind of EPS system and its control method |
| JP6770986B2 (en) * | 2018-03-06 | 2020-10-21 | 日本電産モビリティ株式会社 | Inductive load controller |
| CN112782457A (en) * | 2020-12-28 | 2021-05-11 | 上海思源弘瑞自动化有限公司 | Alternating voltage monitoring circuit and equipment |
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