CN104362720A - Storage battery charging system - Google Patents
Storage battery charging system Download PDFInfo
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- CN104362720A CN104362720A CN201410513271.7A CN201410513271A CN104362720A CN 104362720 A CN104362720 A CN 104362720A CN 201410513271 A CN201410513271 A CN 201410513271A CN 104362720 A CN104362720 A CN 104362720A
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Abstract
A storage battery charging system comprise a first rectifying circuit, an inverter circuit connected with the first rectifying circuit, a voltage isolating circuit connected with the inverter circuit, a second rectifying circuit connected with the voltage isolating circuit, an electric quantity detecting circuit connected with the first rectifying circuit and the inverter circuit, and a control circuit connected with the first rectifying circuit, the electric quantity detecting circuit and the inverter circuit. The control circuit is used for generating a rectifying control signal according to the voltage at the input end and the output end of the first rectifying circuit so as to control the rectifying circuit to output corresponding direct currents and is used for generating an inverting control signal so as to control the inverter circuit to generate corresponding alternating currents. The system is low in noise and size, and safety and reliability are increased by controlling the first rectifying circuit and the inverter circuit.
Description
Technical field
The present invention relates to field of power electronics, specifically, relate to a kind of battery charging system.
Background technology
Widely used a kind of battery charging system, adopts simple phased direct rectification form, causes control precision not high, and output voltage fluctuation is large, ripple is large, and input voltage and output voltage do not have electrical isolation, poor stability.In order to overcome these problem, transformer is generally adopted first to carry out step-down to industrial-frequency alternating current, again rectification is carried out to the alternating current after step-down, although solve electrical isolation problem like this, but transformer has large, the heavier shortcoming of volume causes a whole set of charging system integrated level low, and transformer can produce larger power frequency noise.In addition, the requirement of some field to the safety and reliability of battery charging system is also more and more higher.
Summary of the invention
For the problems referred to above, a kind of battery charging system, comprising:
First rectification circuit, it is for becoming the first direct current by the first AC conversion of input and export;
Inverter circuit, it is connected with described first rectification circuit, for described first direct current is converted to the second alternating current and exports;
Voltage isolation circuit, it is connected with described inverter circuit, for described second alternating current is carried out voltage isolation, obtains the 3rd alternating current and exports;
Second rectification circuit, it is connected with described voltage isolation circuit, for converting described 3rd alternating current to second direct current, comes for charge in batteries;
Electric quantity detecting circuit, it is connected with described first rectification circuit and inverter circuit, for detecting the voltage of described first rectification circuit input end and output, and the electric current of described inverter circuit input and output;
Control circuit, it is connected with described first rectification circuit, electric quantity detecting circuit and inverter circuit, rectify control signal is produced for the voltage according to described first rectification circuit input end and output, the first direct current needed is exported to control described first rectification circuit, also produce inverter control signal for the electric current according to described inverter circuit input and output, produce to control described inverter circuit the second alternating current needed.
In a specific embodiment, described first rectification circuit comprises:
Rectification triggering circuit, it is connected with described control circuit, for producing trigger impulse according to the rectifier and trigger signal in described rectify control signal, stops producing trigger impulse according to the rectification stop signal in described rectify control signal;
Half-controlling bridged rectifier circuit, it is connected with described rectification triggering circuit, for described first alternating current being converted to described first direct current according to described trigger impulse;
Buffer circuit, it is connected in parallel on the two ends of the output of described half-controlling bridged rectifier circuit, for reducing the voltage jump of the output of described half-controlling bridged rectifier circuit.
In a specific embodiment, described half-controlling bridged rectifier circuit comprises:
Multiple thyristor, the negative electrode of described some thyristors is as the output head anode of described half-controlling bridged rectifier circuit, or the anode of described some thyristors is as the negative pole of output end of described half-controlling bridged rectifier circuit.
In a specific embodiment, described first rectification circuit also comprises:
Pre-charge circuit, it is connected to the input of described half-controlling bridged rectifier circuit and the output head anode be made up of described some thyristors or negative pole of output end, for carrying out precharge to described buffer circuit.
Precharge circuits for triggering, it is connected with described control circuit, for according to the precharge triggering signal in described rectify control signal, control described pre-charge circuit and precharge is carried out to described buffer circuit, according to the precharge stop signal in described rectify control signal, control described pre-charge circuit and stop precharge;
In a specific embodiment, when described precharge circuits for triggering are normal, described precharge circuits for triggering send precharge feedback signal to described control circuit;
When described rectification triggering circuit is normal, described rectification triggering circuit sends rectified feedback signal to described control circuit.
In a specific embodiment, described control circuit judges that whether the input terminal voltage of described first rectification circuit is normal, if normally, then sends described precharge triggering signal to described precharge circuits for triggering, otherwise sends precharge stop signal;
If after sending described precharge triggering signal, described control circuit does not receive described precharge feedback signal, then send precharge stop signal to described precharge circuits for triggering;
Described control circuit receives precharge feedback signal and after detecting that the output end voltage of described first rectification circuit reaches preset charged threshold value, sends rectifier and trigger signal, carry out rectification to control described rectification triggering circuit to described rectification triggering circuit;
If after sending rectifier and trigger signal, described control circuit does not receive described rectified feedback signal, then send rectification stop signal to described rectification triggering circuit.
In a specific embodiment, described control circuit judges whether the input of described inverter circuit and/or output electricity exceed default power threshold, if exceeded, then send rectification stop signal.
In a specific embodiment, described inverter circuit comprises the first Change phase capacitance and second Change phase capacitance of the series connection being connected in parallel on its input two ends, wherein, described electric quantity detecting circuit is connected with the first Change phase capacitance, to detect the voltage at described first Change phase capacitance two ends.
In a specific embodiment, described control circuit judges whether the magnitude of voltage sum of described first Change phase capacitance and the second Change phase capacitance exceedes predetermined voltage range, if exceeded, then sends rectification stop signal,
In a specific embodiment, described control circuit calculates the difference of the voltage of the first Change phase capacitance and the second Change phase capacitance, and after the absolute value of described difference exceeds predeterminated voltage difference, sends rectification stop signal to described first rectification circuit.
In a specific embodiment, described inverter circuit, according to the inversion triggering signal in described inverter control signal, produces described second alternating current, according to the inversion stop signal in described inverter control signal, stops producing described second alternating current.
In a specific embodiment, described inverter circuit comprises:
Inverter trigger circuit, it is connected with described control circuit, for producing drive singal according to the inversion triggering signal in inverter control signal, according to the inversion stop signal in inverter control signal, stops producing drive singal;
Half-bridge inversion circuit, it is connected with described first rectification circuit and inverter trigger circuit, for described first direct current being converted to described second alternating current according to described drive singal.
In a specific embodiment, described control circuit judges the predetermined current the difference whether absolute value of the twice of the input current of described inverter circuit and the difference of described inverter circuit output current is greater than if so, then to send inversion stop signal.
In a specific embodiment, described control circuit sends inversion stop signal to described inverter circuit after judging that described inverter circuit output current value exceedes predetermined current threshold.
The first rectification circuit of the present invention just direct rectification in grid alternating current source is the first more level and smooth direct current, first DC inverter is the second alternating current that frequency is higher by inverter circuit, because the frequency of the second alternating current is higher, so both can carry out electrical isolation with the voltage isolation circuit of small volume, the noise also making voltage isolation circuit produce is smaller.In addition, control circuit adjusts the first direct current and the second alternating current respectively according to the first rectification circuit input end and the voltage of output and the electric current of inverter circuit input and output, the curtage that this system components is born in the scope of safety, to promote the safety and reliability of this system.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Also will be described in more detail the present invention with reference to accompanying drawing based on embodiment hereinafter.Wherein:
Fig. 1 is the circuit diagram of the battery charging system of one embodiment of the present invention.
Fig. 2 is the schematic diagram of the first rectification circuit of the battery charging system of one embodiment of the present invention.
In the accompanying drawings, identical parts use identical Reference numeral.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Fig. 1 is the circuit connection diagram of the battery charging system of one embodiment of the present invention.In the present embodiment, battery charging system comprises main circuit and control circuit.Main circuit comprises for the first AC conversion of input being become the first direct current and the first rectification circuit exported, be connected to the first rectification circuit and inverter circuit for the first direct current being converted to the second alternating current, be connected to inverter circuit and for converting the second alternating current the voltage isolation circuit of the 3rd alternating current to after electrical isolation, be connected to voltage isolation circuit and for the 3rd alternating current is changed second direct current export the second rectification circuit, be connected to the second rectification circuit and for the second direct current being carried out filtering and outputting to the filter circuit of storage battery.Concrete connected mode is as follows:
Fig. 2 schematically show the first rectification circuit.Can find out corresponding to Fig. 1, terminal U1, V1, W1 are respectively the input corresponding to current-limiting resistance R3, R2, R1, trigger terminal U2, V2, W2 correspond respectively to the normally opened contact of relay 26,27,28, charging terminal 21 corresponds to the normally opened contact of relay 29, and control and feedback end 22 correspond to precharge control end 401, precharge feedback reception end 402, rectifier and trigger control end 403, rectifier and trigger feedback reception end 404.In the present embodiment, the first rectification circuit comprises half-controlling bridged rectifier circuit 1.Half-controlling bridged rectifier circuit 1 comprises 3 thyristors 11 ~ 13,3 diodes 14 ~ 16, the negative electrode of thyristor 11 ~ 13 links together and forms the output anode D1 of half-controlling bridged rectifier circuit 1, and the anode of diode 14 ~ 16 links together and forms the output cathode D2 of half-controlling bridged rectifier circuit 1.The anode of each thyristor is corresponding with the negative electrode of each diode to be connected, i.e. 11 in Reference numeral and 14,12 and 15,13 and 16 are interconnected.Diode and thyristor connecting place are respectively three-phase input end mouth U, V, W of battery charging system, the external three phase supply electrical network of input port U, V, W.The gate pole of thyristor 11 ~ 13 is connected to trigger terminal U2, V2, W2 of the first circuits for triggering 2.The electric current of the one-way conduction characteristic restriction three phase network conveying of diode and thyristor can only flow to anode D1, exports so the three-phase alternating current of input battery charging system can be changed into direct current by half-controlling bridged rectifier circuit 1.First circuits for triggering 2 add the forward voltage exceeding thyristor threshold values, then thyristor 11 conducting between triggering port U2 and current limliting rectifying port U1, otherwise thyristor 11 disconnects.In like manner, the conducting of thyristor 12,13 is also control by the first circuits for triggering 2 with disconnecting.The controllable conduction characteristic of thyristor determines the conducting of half-controlling bridged rectifier circuit 1 and to disconnect be controlled.
In the present embodiment, the first rectified current also comprises the first circuits for triggering 2.First circuits for triggering 2 comprise the current-limiting resistance R1 ~ R3 being connected to three-phase input end mouth W, V, U, anode is connected respectively the diode 23 ~ 25 in current-limiting resistance R1 ~ R3 other end, moving contact is connected to the relay 28 ~ 26 of diode 23 ~ 25 negative electrode, and moving contact is connected to the normally-closed contact of relay 28 ~ 26 and normally opened contact is connected to the output anode D1 relay 29 of half-controlling bridged rectifier circuit 1.Coil one end ground connection GND of relay 29, the precharge control end 401 of other end connection control circuit 4, the precharge feedback reception end 402 of the normally closed feedback signal output connection control circuit 4 of the coil of relay 29.Coil one end ground connection GND of relay 26 ~ 28, the rectifier and trigger control end 403 of other end connection control circuit 4, the rectifier and trigger feedback reception end 404 of the normally closed feedback signal output connection control circuit 4 of the coil of relay 26 ~ 28, the normally opened contact of relay 26 ~ 28 is connected to the gate pole of thyristor 11 ~ 13.
Control circuit 4 sends an electric current to relay 29 from precharge control end 401, the normally opened contact of relay 29 and moving contact close, external three-phase alternating current, after R1 ~ R3 current limliting and diode 23 ~ 25,14 ~ 15 rectification, carries out precharge in Support Capacitor 36.After the normally opened contact of relay 29 and moving contact normally closed, send normally-closed contact feedback signal to precharge feedback reception end 402, namely feed back precharge feedback signal to control circuit 4.Control circuit 4 sends an electric current to relay 26 ~ 28 from rectifier and trigger control end 403, the normally opened contact of relay 26 ~ 28 and moving contact close, stop precharge, and sending trigger impulse to the thyristor 11 ~ 13 of half-controlling bridged rectifier circuit 2, half-controlling bridged rectifier circuit 2 starts the three-phase alternating current electric rectification of input.After the normally opened contact of relay 26 ~ 28 and moving contact normally closed, send normally-closed contact feedback signal to precharge feedback reception end 404, namely feed back rectified feedback signal to control circuit 4.Thyristor and diode can be avoided to open because of thyristor the current break caused to Support Capacitor 36 precharge makes thyristor and diode damage.Support Capacitor 36 is as the buffer circuit of half-bridge inversion circuit 3 and half-controlling bridged rectifier circuit 1.
In the present embodiment, inverter circuit comprises half-bridge inversion circuit 3.Half-bridge inversion circuit 3 comprises two ends jointed anode D1 respectively, the Support Capacitor 36 that negative electrode D2 holds, two Change phase capacitances 37 in parallel with Support Capacitor 36 after two series connection, 38, collector electrode and anode D1 hold the IGBT 32 (IGBT is the abbreviation of insulated gate bipolar transistor) connected, emitter and negative electrode D2 hold and connect and the IGBT 33 that is connected with the emitter of IGBT 32 of collector electrode, negative electrode connects with the collector electrode of IGBT 32 and the diode 34 that connects with IGBT 32 emitter of anode, negative electrode connects with the collector electrode of IGBT 33 and the diode 35 that connects with IGBT 33 emitter of anode, and first the first terminal and second terminal of driving pulse output interface be connected IGBT 32 respectively gate pole with emitter and the first terminal of the second driving pulse output interface and the second terminal are connected the gate pole of IGBT 33 and the gate trigger circuit 31 of emitter respectively.Two the connected ends of electric capacity 37,38, two IGBT 32,33 are connected and hold two lead-out terminals of formation inverter circuits 3, and these two lead-out terminals are connected respectively on high-tension side two terminals of transformer T1.
Gate trigger circuit 31 can from the first driving pulse exporting the positive and negative space changing of one-period between the first terminal of the first driving pulse output interface and the second terminal, and the numerical value A of the voltage of this driving pulse is more than the numerical value B of the threshold values of IGBT 32.The time that first driving pulse output interface exports positive voltage in one-period is less than or equal to the time exporting negative voltage, export as positive voltage is then conducting IGBT 32, export and then end IGBT 32 for during negative voltage, in one-period, ON time is less than or equal to deadline.Exporting but time identical with the first drive pulse shape between first lead-out terminal of the second driving pulse output interface and the second lead-out terminal goes up the second driving pulse differing half period, conducting IGBT33 when the second driving pulse is positive voltage.Such driving pulse is conducting two IGBT in turn, and end another IGBT when a conducting IGBT, two are made to turn to electric capacity 37, a 38 alternately one charging electric discharge, the voltage at each Change phase capacitance 37,38 two ends constantly changes simultaneously, thus makes the output port output single-phase alternating current of inverter circuit 3.Preferably, this driving pulse is square wave, the A that B is greater than 1.5 times to 3 times, and the benefit chosen like this is driving pulse energy conducting IGBT rapidly, makes the input voltage trend square wave of high voltage side of transformer.The duty ratio of adjustment two driving pulses can adjust the ON time of IGBT in one-period, and then the on high-tension side input voltage of adjustment transformer T1.
In the present embodiment, transformer T1 is by the voltage step-down of the single-phase alternating current of the output of inverter circuit 3.If the input voltage of voltage device T1 is higher, then the voltage of its single-phase alternating current exported is higher.
In the present embodiment, the second rectification circuit comprises single phase bridge type rectifier circu 5.Single phase bridge type rectifier circu 5 comprises 4 diodes 51 ~ 54, 4 diodes 51 ~ 54 are divided into two groups, first group of diode 51, the negative electrode of 53 links together and forms the output HV Terminal of single phase rectifier circuit 5, second group of diode 52, the anode of 54 links together and forms the output low-voltage terminal of single phase rectifier circuit 5, the anode of each diode of first group is corresponding with the negative electrode of the diode of second group to be one by one connected, i.e. 51 in Reference numeral and 52, 53 is corresponding with 54 connected, first group of diode connects with two ports of transformer T1 low-pressure end respectively with second group of diode connecting place.The electric current that the characteristic of diode one-way conduction defines the output of transformer T1 can only flow to HV Terminal, exports so the single-phase alternating current of input can be converted to direct current by single phase bridge type rectifier circu 5.
In the present embodiment, filter circuit 6 is inverted L shape filter circuit.The output anode DC1 of this battery charging system is formed at the output high-pressure side of single phase rectifier circuit 5 inductance 61 of connecting.The low-voltage output of single phase rectifier circuit 5 forms the output cathode DC2 of this battery charging system.An electric capacity 62 is connected between output anode DC1 with output cathode DC2.When flowing through the curent change of inductance L 2, the induced electromotive force produced in inductance coil will stop the change of electric current.When the electric current by inductance coil increases, the self induction electromotive force that inductance coil produces is contrary with the sense of current, stops the increase of electric current, becomes magnetic field energy to be stored among inductance a part of electric energy conversion simultaneously.When the electric current by inductance coil reduces, self induction electromotive force is identical with the sense of current, stops the reduction of electric current, discharges the energy of storage, with the reduction of offset current simultaneously.Therefore, after inductor filter, not only the pulsation of load current and voltage reduces, and waveform becomes level and smooth, and in single phase rectifier circuit 5, the angle of flow of diode 51 ~ 54 increases, and remaining a small amount of alternating component is again through capacitor filtering below, weakened further.
The anode DC1 of battery charging system connects the positive pole of batteries 7, and the negative electrode DC2 of battery charging system connects the negative pole of batteries 7.
In the present embodiment, control circuit 4 comprises logic controller 41, pwm pulse generator 42, voltage collector circuit 43.
The voltage of the input voltage of voltage collection circuit 43 pairs of half-controlled bridge type rectification circuits 1, the voltage of Change phase capacitance 37, Change phase capacitance 38 carries out magnitude of voltage information gathering, and magnitude of voltage information is input to logic controller 41.Particularly, voltage collection circuit 43 carries out high_voltage isolation to collected circuit, then will obtain the analog signal describing this circuit voltage information after voltage transformation, finally this analog signal is converted to digital signal and is sent to logic controller 41.The input voltage a of the half-controlling bridged rectifier circuit 1 collected, the voltage b of Change phase capacitance 37, the voltage c of Change phase capacitance 38.
Pwm pulse generator 42 produces triggering signal and controls gate trigger circuit 31.After pwm pulse generator 42 receives the inversion triggering signal that logic controller 41 sends, send lasting pulse signal to gate trigger circuit 31.Stop producing pulse signal after pwm pulse generator 42 receives the inversion stop signal that logic controller 41 sends.While gate trigger circuit 31 receives this pulse signal, produce the first driving pulse and the second driving pulse works to drive half-bridge inversion circuit 33.Gate trigger circuit 31 does not then produce the first driving pulse and the second driving pulse after not receiving pulse signal; two IGBT of half-bridge inversion circuit 33 are made to stop conducting; current value between restriction IGBT collector electrode and emitter, thus protection IGBT to be unlikely to electric current because passing through excessive and damage.
Logic controller 41 is connected to and is arranged on half-bridge inversion circuit 3 input for detecting the first current acquisition element SC1 of the input current c of half-bridge inversion circuit 3, is arranged on half-bridge inversion circuit 3 output for detecting the second current acquisition elements T A of the current value d of half-bridge inversion circuit 3 output.Preferably, the second current acquisition elements T A responds instrument transformer fast, and the response time detecting high voltage side of transformer average current is less than 10 μ s.All kinds of information about power that logic controller 41 collects for receiver voltage Acquisition Circuit 42, first current acquisition element SC1 and the second current acquisition elements T A, and according to predetermined control program, executive circuit is controlled directly or indirectly.Control flow is as follows:
After three-phase input end mouth U, V, W access three phase network, voltage collection circuit 43 transmits the input voltage value a of half-controlling bridged rectifier circuit to logic controller 41.Logic controller 41 judges that this voltage does not then carry out further action in normal range (NR).Logic controller 41 judges that this voltage then sends precharge triggering signal to switch and feedback circuit in normal range (NR).Charge to Support Capacitor 36 after first circuits for triggering 2 receive precharge triggering signal and send precharge feedback signal to logic controller 41.
According to precharge feedback signal, logic controller 41 judges whether the normally opened contact of the relay 29 in the first circuits for triggering 2 and moving contact close.If normally opened contact and the moving contact of relay 29 are not closed, send precharge stop signal to switch and feedback circuit.If normally opened contact and the moving contact of relay 29 close, whether the value (i.e. the value at Support Capacitor 36 two ends) detecting the output voltage of half-controlling bridged rectifier circuit 1 reaches preset value.If the voltage of Support Capacitor 36, reach preset value and then send precharge stop signal, rectifier and trigger signal and inversion triggering signal.If Support Capacitor 36 do not reach preset value, then send precharge stop signal to the first circuits for triggering 2.
When logic controller 41 judges that the input voltage value of half-controlling bridged rectifier circuit 1 does not then charge in normal range (NR), battery charging system can be avoided like this by too high voltage breakdown.When logic controller 41 judged result is the normally opened contact of relay 29 and moving contact is not closed, the first circuits for triggering 2 damage, and must stop charging to protect storage battery.When logic controller 41 judges that the voltage of Support Capacitor 36 does not reach preset value, then half-controlling bridged rectifier circuit 1 or inverter circuit 3 damage, and stop charging to protect storage battery.
For the further improvement of this invention, the input voltage a of the half-controlling bridged rectifier circuit 1 that voltage collection circuit 43 collects, the voltage b of Change phase capacitance 37, the voltage of Change phase capacitance 38 is c, control circuit 41 judges whether the magnitude of voltage sum of described Change phase capacitance exceedes predetermined voltage range, if exceeded, then send rectification stop signal, predetermined voltage range comprises [(1-A) BU
in, (1+A) BU
in], wherein A and B represents coefficient, U
inrepresent the effective value of the first rectification circuit input voltage.Wherein A and B represents positive coefficient, wherein A≤1, U
inrepresent the effective value of the first rectification circuit input voltage.The span of A is [0,0.3], and the span of B is [1.2,1.5].Those skilled in the art can choose the concrete numerical value of A according to the bearing capacity of the element of this system of composition, A represents the bearing capacity of this system to voltage.B represents that RMS-DC converter that the first rectification circuit records input voltage is the error of the crest voltage of input voltage.
In theory, 1.4 times of the input voltage value of half-controlling bridged rectifier circuit 1 equal the magnitude of voltage sum of two Change phase capacitances 37,38, but have certain deviation in practical application.Two preset values changing capacitance voltage sum and exceed or be less than the first rectification circuit input voltage; then thyristor 11 ~ 13 job failure or the first circuits for triggering 2 failure exception; logic controller 41 sends rectification stop signal to the first circuits for triggering 2 and sends inversion stop signal to pwm pulse generator 42; main circuit is quit work, plays a protective role.
For the further improvement of this invention, logic controller 41 compares the magnitude of voltage on two Change phase capacitances 37,38, the absolute value of difference exceed predeterminated voltage difference after, logic controller 41 sends rectification stop signal to the first circuits for triggering 2 and sends inversion stop signal to pwm pulse generator 42, main circuit is quit work, and the scope of predeterminated voltage difference is 5 ~ 30V.
AC200V/30Hz ~ AC500V/90Hz input voltage changes in the application of DC74V output, when the absolute value of the voltage difference on two Change phase capacitances 37,38 is less than a certain value, then system is normal, and those skilled in the art can according to practical application selected predeterminated voltage difference within the scope of 5V ~ 30V.After the absolute value of the difference of two Change phase capacitance 37,38 voltages exceeds predeterminated voltage difference; component wear in two Change phase capacitances, 37,38 or two IGBT 32,33 or gate trigger circuit; at this moment logic controller 41 sends rectification stop signal to the first circuits for triggering 2 and sends inversion stop signal to pwm pulse generator 42; main circuit is quit work, plays a protective role.
For the further improvement of this invention, logic controller 41 compares the average current d of the input average current value c of half-bridge inversion circuit 33 and the output of half-bridge inversion circuit 33, the preset value that the absolute value of the twice of the input current of half-bridge inversion circuit 33 and the difference of described inverter circuit output current is greater than, logic controller 41 sends rectification stop signal to the first circuits for triggering 2 and sends inversion stop signal to pwm pulse generator 42, and main circuit is quit work.Wherein the preset value of inverter circuit output current is by being calculated by formula (1),
I
1＝E×I
out(1)
In formula (1):
I
1for the preset value of half-bridge inversion circuit output current, unit is ampere;
E is constant, and selected scope is 0.1 ~ 0.3;
I
outfor inverter circuit output current value, unit is ampere.
In theory, the input average current value c of half-bridge inversion circuit 33 is twices of the output average current d of half-bridge inversion circuit 33, but has certain deviation in practical application.After the twice of the input current of half-bridge inversion circuit 33 exceeds or be less than the preset value of half-bridge inversion circuit output current, puncture IGBT 32,33 possibly, at this moment need to increase the impedance of IGBT puncturing before peak value arrives of the electric current through IGBT.It is certain numerical value in 10% ~ 30% scope that those skilled in the art can select E according to practical application.So send inversion stop signal to pwm pulse generator 42, forbid that pwm pulse 42 generator produces triggering signal to gate trigger circuit 31, avoid IGBT to damage.In addition; the response time detecting the output current d of half-bridge inversion circuit 33 is less than 10 μ s; directly come by the passage of logic controller, pwm pulse generator 42, gate trigger circuit 31; carry out detecting than adopting software and protection shortens the response time, IGBT is effectively protected.
For the further improvement of this invention, at triggering instance, output current d and the predetermined threshold value of logic controller 41 pairs of half-bridge inversion circuits 33 compare, if exceed its predetermined threshold value, then send rectification stop signal to the first circuits for triggering 2 and send inversion stop signal to pwm pulse generator.
IGBT is usually excessive and breakdown because of electric current, needs the current value limiting IGBT, namely needs the output current d limiting half-bridge inversion circuit 33, makes it be less than the breakdown potential flow valuve of IGBT.At this moment the predetermined threshold value that is less than the breakdown potential flow valuve of IGBT is set; the system of charging a battery leaves amount of redundancy; when the output current d of half-bridge inversion circuit 33 exceedes its limit value; logic controller 41 sends inversion stop signal to pwm pulse generator; increase the impedance of IGBT, thus protection IGBT is not breakdown.
In the present embodiment, control circuit 4 also comprises closed loop priority P ID controller 44.Pwm pulse generator 42 also receives the inversion pressure regulation signal that closed loop priority P ID controller 44 sends, the width that inversion pressure regulation signal is used for adjusting the pulse signal that pwm pulse generator 42 sends is to the duty ratio of the first driving pulse controlling gate trigger circuit 31 and send and the second driving pulse, thus regulate the output voltage of half-bridge inversion circuit 3, and then the output voltage of adjustment the second rectification circuit 5, and then output current, the output voltage of adjustment filter circuit 6.
In the present embodiment, closed loop priority P ID controller 44 is connected to electric quantity detecting circuit, pwm pulse generator 42 and logic controller 41.Electric quantity detecting circuit comprises the output that is arranged at filter circuit 6 for the 3rd current acquisition element SC2 of detection filter circuit 6 output current, and is connected to the testing circuit of filter circuit 6 output for detection filter circuit 6 output voltage.
The output voltage of closed loop priority P ID controller 44 for default filter circuit 6, the predetermined target value of these two parameters of output current, periodically compare this two parameters and its predetermined target value.If all do not exceed its predetermined target value, do not enter correction link, otherwise select one of them do not carry out revising in the upper cycle and exceeded the correction link that the maximum parameter of the numerical value of its predetermined target value enters this cycle.Revising link is that the degree that closed loop priority P ID controller 44 exceeds its predetermined target value according to the parameter entering correction link sends pressure regulation signal to pwm pulse generator 42.Pwm pulse generator 42 reduces according to pressure regulation signal or increases the width of pulse signal, thus reduce or increase the first driving pulse of sending of gate trigger circuit 31 and the second driving pulse duty ratio, and then reduce or increase the output voltage of inverter circuit 3, make the parameter exceeding or be less than predetermined target value reduce or be increased to predetermined target value.
As a further improvement on the present invention, this system also comprises the residual capacity detection means and temperature sensing circuit that are connected to closed loop priority P ID controller 44.Residual capacity testing circuit can detect the remaining capacity value of storage battery 7, and is transferred to closed loop priority P ID controller 44.Temperature sensing circuit can detect the temperature value of storage battery 7, and is transferred to closed loop priority P ID controller 44.Closed loop priority P ID controller 44 can according to the predetermined target value of the output current of the automatic calculation of filtered circuit 6 of the remaining capacity value of storage battery 7.Closed loop priority P ID controller 44 can according to the predetermined target value of the output voltage of the automatic calculation of filtered circuit 6 of the temperature value of storage battery 7.Specific as follows:
Residual capacity and rated capacity are divided by, are obtained the percentage that residual capacity accounts for rated capacity after receiving the residual capacity data of residual capacity testing circuit transmission by closed loop priority P ID controller 44.Then, decide the predetermined target value of the output current of filter circuit 6 according to percent value, the predetermined target value of the output current of filter circuit 6 reduces along with percent value and reduces.Such as: when this percentage is greater than 50%, the predetermined target value of the output current of filter circuit 6 is adjusted to a larger value by closed loop priority P ID controller 44, thus big current quick charge is carried out to storage battery 7, prevent storage battery 7 from reducing the performance of storage battery 7 because of power shortage overlong time; When this percent value is less than 50% and is greater than 5%, closed loop priority P ID controller 44 is adjusted to a less value the predetermined target value of the output current of filter circuit 6, thus prevents long-time large current charge from damaging storage battery 7; When this percentage is less than 5%, the predetermined target value of the output current of filter circuit 6 is reduced to zero, thus prevents from causing storage battery 7 to damage or hydraulic performance decline to storage battery 7 overcharge.
To further improvement of the present invention, closed loop priority P ID controller 44 can calculate the predetermined target value of the output current of filter circuit 6 based on the residual capacitance of the storage battery 7 detected for variable optimal charge curvilinear equation, residual capacity testing circuit with the output current of the residual capacitance of storage battery 7 and filter circuit 6.Inventor find, storage battery 7 have with the residual capacity of storage battery 7 be independent variable, with the output current of filter circuit 6 for dependent variable and the output current of filter circuit 6 along with storage battery 7 residual capacity reduce and reduce and continually varying optimal charge curve.If the output current of filter circuit 6 by this curvilinear motion, just can shorten the charging interval greatly, and the capacity of battery and life-span are not also affected.Those skilled in the art can test storage battery 7, simulate this optimal charge curvilinear equation.
When closed loop priority P ID controller 44 detects the temperature of storage battery 7 lower than preset temperature, closed loop priority P ID controller 44 improves the predetermined target value of the output voltage of filter circuit 6.When closed loop priority P ID controller 44 detects the temperature of storage battery 7 higher than preset temperature, closed loop priority P ID controller 44 reduces the predetermined target value of the output voltage of filter circuit 6.The predetermined target value of the output voltage of closed loop priority P ID controller 44 pairs of filter circuits 6 arranges upper safety limit, namely no longer improve the predetermined target value of the output voltage of filter circuit 6 when temperature dropped to a certain extent for storage battery 7, damage to avoid other components and parts of this system.
This preset temperature is generally rated temperature.Such as, when this preset temperature value is 25 DEG C.Along with ambient temperature reduces, the electrolyte flow of storage battery 7 reduces, and combination reaction slows down, and when ambient temperature is lower than 25 DEG C, makes storage battery 7 capacity be difficult to reach rated capacity.When ambient temperature is higher than 25 DEG C, storage battery 7 capacity high rated capacity, when charging to storage battery 7, quite a few charging current is converted into heat energy, storage battery 7 internal temperature is aggravated, causes vicious circle, cause storage battery 7 to damage.Too high temperature can cause charging stream to increase, and owing to overcharging the accumulation of electricity, thus storage battery 7 cycle life is shortened.Be proved to be, when ambient temperature is at 25 DEG C, temperature often raises 6 ~ 10 DEG C, storage battery 7 lost of life half.Along with the charging voltage (i.e. the output voltage of filter circuit 6) of the variations in temperature adjustment storage battery 7 of storage battery 7, overcharge and the charge less electricity of battery can be avoided, extend storage battery 7 life-span.The optimal charge piezoelectricity value of those skilled in the art's single storage battery 7 under can recording preset temperature.
As a further improvement on the present invention, closed loop priority P ID controller 44 sets the output current of filter circuit 6, the predetermined threshold value of the output current of output voltage and filter circuit 6, the output current of filter circuit 6 periodically relatively determined by closed loop priority P ID controller 44, the output current of output voltage and filter circuit 6 and its threshold value, exceed its predetermined threshold value any one of it and then send stop signal to logic controller 41, logic controller 41 sends rectification stop signal according to stop signal to the first circuits for triggering 2 and sends inversion stop signal to pwm pulse generator 42, main circuit is quit work, thus battery charging system and storage battery 7 are protected.
Although invention has been described with reference to preferred embodiment, without departing from the scope of the invention, various improvement can be carried out to it and element wherein can be replaced with equivalent.Especially, only otherwise there is conflict, the every technical characteristic mentioned in embodiment all can combine in any way.The present invention is not limited to specific embodiment disclosed in literary composition, but comprises all technical schemes fallen in the scope of claim.
Claims (14)
1. a battery charging system, comprising:
First rectification circuit, it is for becoming the first direct current by the first AC conversion of input and export;
Inverter circuit, it is connected with described first rectification circuit, for described first direct current is converted to the second alternating current and exports;
Voltage isolation circuit, it is connected with described inverter circuit, for described second alternating current is carried out voltage isolation, obtains the 3rd alternating current and exports;
Second rectification circuit, it is connected with described voltage isolation circuit, for converting described 3rd alternating current to second direct current, comes for charge in batteries;
Electric quantity detecting circuit, it is connected with described first rectification circuit and inverter circuit, for detecting the voltage of described first rectification circuit input end and output, and the electric current of described inverter circuit input and output;
Control circuit, it is connected with described first rectification circuit, electric quantity detecting circuit and inverter circuit, rectify control signal is produced for the voltage according to described first rectification circuit input end and output, the first direct current needed is exported to control described first rectification circuit, also produce inverter control signal for the electric current according to described inverter circuit input and output, produce to control described inverter circuit the second alternating current needed.
2. the system as claimed in claim 1, is characterized in that, described first rectification circuit comprises:
Rectification triggering circuit, it is connected with described control circuit, for producing trigger impulse according to the rectifier and trigger signal in described rectify control signal, stops producing trigger impulse according to the rectification stop signal in described rectify control signal;
Half-controlling bridged rectifier circuit, it is connected with described rectification triggering circuit, for described first alternating current being converted to described first direct current according to described trigger impulse;
Buffer circuit, it is connected in parallel on the two ends of the output of described half-controlling bridged rectifier circuit, for reducing the voltage jump of the output of described half-controlling bridged rectifier circuit.
3. system as claimed in claim 2, it is characterized in that, described half-controlling bridged rectifier circuit comprises:
Multiple thyristor, the negative electrode of described some thyristors is as the output head anode of described half-controlling bridged rectifier circuit, or the anode of described some thyristors is as the negative pole of output end of described half-controlling bridged rectifier circuit.
4. system as claimed in claim 3, it is characterized in that, described first rectification circuit also comprises:
Pre-charge circuit, it is connected to the input of described half-controlling bridged rectifier circuit and the output head anode be made up of described some thyristors or negative pole of output end, for carrying out precharge to described buffer circuit;
Precharge circuits for triggering, it is connected with described control circuit, for according to the precharge triggering signal in described rectify control signal, control described pre-charge circuit and precharge is carried out to described buffer circuit, according to the precharge stop signal in described rectify control signal, control described pre-charge circuit and stop precharge.
5. system as claimed in claim 4, is characterized in that,
When described precharge circuits for triggering normally work, described precharge circuits for triggering send precharge feedback signal to described control circuit;
When described rectification triggering circuit normally works, described rectification triggering circuit sends rectified feedback signal to described control circuit.
6. system as claimed in claim 5, is characterized in that,
Described control circuit judges that the input terminal voltage of described first rectification circuit is whether in the normal range (NR) preset, if in the normal range (NR) preset, then send described precharge triggering signal to described precharge circuits for triggering, otherwise send precharge stop signal;
If after sending described precharge triggering signal, described control circuit does not receive described precharge feedback signal, then send precharge stop signal to described precharge circuits for triggering;
Described control circuit receives precharge feedback signal and after detecting that the output end voltage of described first rectification circuit reaches preset charged threshold value, sends rectifier and trigger signal, carry out rectification to control described rectification triggering circuit to described rectification triggering circuit;
If after sending rectifier and trigger signal, described control circuit does not receive described rectified feedback signal, then send rectification stop signal to described rectification triggering circuit.
7. the system according to any one of claim 1 ~ 6, is characterized in that, described control circuit judges whether the input of described inverter circuit and/or output electricity exceed default power threshold, if exceeded, then send rectification stop signal.
8. the system according to any one of claim 1 ~ 7, it is characterized in that, described inverter circuit comprises the first Change phase capacitance and second Change phase capacitance of the series connection being connected in parallel on its input two ends, wherein, described electric quantity detecting circuit is connected with the first Change phase capacitance, the second Change phase capacitance, to detect the voltage of described first Change phase capacitance, described second Change phase capacitance respectively.
9. system as claimed in claim 8, it is characterized in that, described control circuit judges whether the magnitude of voltage sum of described first Change phase capacitance and the second Change phase capacitance exceedes predetermined voltage range, if exceeded, then sends rectification stop signal.
10. system as claimed in claim 8 or 9, it is characterized in that, described control circuit calculates the difference of the voltage of the first Change phase capacitance and the second Change phase capacitance, and after the absolute value of described difference exceeds predeterminated voltage difference, sends rectification stop signal to described first rectification circuit.
11. systems according to any one of claim 1 ~ 10, it is characterized in that, described inverter circuit, according to the inversion triggering signal in described inverter control signal, produces described second alternating current, according to the inversion stop signal in described inverter control signal, stop producing described second alternating current.
12. systems as claimed in claim 11, it is characterized in that, described inverter circuit comprises:
Inverter trigger circuit, it is connected with described control circuit, for producing drive singal according to the inversion triggering signal in inverter control signal, according to the inversion stop signal in inverter control signal, stops producing drive singal;
Half-bridge inversion circuit, it is connected with described first rectification circuit and inverter trigger circuit, for described first direct current being converted to described second alternating current according to described drive singal.
13. systems as described in claim 11 or 12, it is characterized in that, described control circuit judges the predetermined current the difference whether absolute value of the twice of the input current of described inverter circuit and the difference of described inverter circuit output current is greater than if so, then to send inversion stop signal.
14. systems as described in claim 12 or 13, it is characterized in that, described control circuit sends inversion stop signal to described inverter circuit after judging that described inverter circuit output current value exceedes predetermined current threshold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410513271.7A CN104362720B (en) | 2014-09-29 | 2014-09-29 | Storage battery charging system |
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| CN201410513271.7A CN104362720B (en) | 2014-09-29 | 2014-09-29 | Storage battery charging system |
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| CN104362720B CN104362720B (en) | 2017-01-25 |
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| CN104638740A (en) * | 2015-02-28 | 2015-05-20 | 重庆长安汽车股份有限公司 | Charging device for electric vehicle |
| CN105529795A (en) * | 2016-01-18 | 2016-04-27 | 河南理工大学 | Inductive electric motor car charging device |
| EP3276778A1 (en) * | 2016-07-26 | 2018-01-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, lightning protection method for terminal during charging, and power adapter |
| US10277053B2 (en) | 2016-02-05 | 2019-04-30 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, lightning protection method for terminal during charging, and power adapter |
| CN112737366A (en) * | 2020-12-29 | 2021-04-30 | 核工业西南物理研究院 | Thyristor power supply control system powered by pulse generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104638740A (en) * | 2015-02-28 | 2015-05-20 | 重庆长安汽车股份有限公司 | Charging device for electric vehicle |
| CN105529795A (en) * | 2016-01-18 | 2016-04-27 | 河南理工大学 | Inductive electric motor car charging device |
| US10277053B2 (en) | 2016-02-05 | 2019-04-30 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, lightning protection method for terminal during charging, and power adapter |
| US10348121B2 (en) | 2016-02-05 | 2019-07-09 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, lightning protection method for terminal during charging, and power adapter |
| US10381861B2 (en) | 2016-02-05 | 2019-08-13 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, charging method, and power adapter |
| EP3276778A1 (en) * | 2016-07-26 | 2018-01-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging system, lightning protection method for terminal during charging, and power adapter |
| CN112737366A (en) * | 2020-12-29 | 2021-04-30 | 核工业西南物理研究院 | Thyristor power supply control system powered by pulse generator |
| CN112737366B (en) * | 2020-12-29 | 2023-09-08 | 核工业西南物理研究院 | Thyristor power supply control system powered by pulse generator |
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|---|---|
| CN104362720B (en) | 2017-01-25 |
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