CN204425018U - Electri forklift and the charging system for electri forklift - Google Patents
Electri forklift and the charging system for electri forklift Download PDFInfo
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- CN204425018U CN204425018U CN201520053645.1U CN201520053645U CN204425018U CN 204425018 U CN204425018 U CN 204425018U CN 201520053645 U CN201520053645 U CN 201520053645U CN 204425018 U CN204425018 U CN 204425018U
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Abstract
The utility model proposes a kind of charging system for electri forklift, comprising: electrokinetic cell; Charging device, the alternating current of charging device to input converts the first direct current exporting supply electrokinetic cell; Three-phase alternating voltage, the electric current of the alternating current of real-time detection input exchange checkout gear with phase place; The charging voltage of real-time detection electrokinetic cell and the DC detecting device of charging current; Controller, controller judges the mode of operation of charging device according to charging voltage and charging current, and controls charging device to regulate the first galvanic voltage range according to the three-phase alternating voltage of alternating current of input, electric current and phase place and charging voltage and charging current.This charging system can not only realize the quick charge to electrokinetic cell, and have that design architecture is simple, good stability, output the advantage of electric current and voltage wide ranges etc.The utility model also proposed a kind of electri forklift.
Description
Technical field
The utility model relates to electri forklift technical field, particularly a kind of charging system for electri forklift and a kind of electri forklift.
Background technology
Electri forklift is as a kind of conventional logistics haulage equipment, and application widely.Along with the progress of battery technology, increasing electri forklift uses ferric phosphate lithium cell as energy storage component.The advantage that ferric phosphate lithium cell has a lot of lead-acid battery to reach: material environment friendly is unleaded, charge and discharge cycles number of times is long, energy density is large and rate of charge is large etc., so need to configure high-power quick charger to electri forklift.
Traditional charger generally adopts two kinds of design architectures: low-frequency transformer framework and high frequency switch power framework.The former is generally applied in lead-acid battery charger, and its shortcoming is that power volume is large, heavy, charge efficiency is low, and the shortcoming of the latter is that charging current is smaller, and when power ascension, its heating is serious, and the voltage stability of output is poor.
Therefore, need to improve traditional charger.
Utility model content
The purpose of this utility model is intended at least solve one of above-mentioned technological deficiency.
For this reason, an object of the present utility model is to propose a kind of charging system for electri forklift, can not only realize the quick charge to electrokinetic cell, and have that design architecture is simple, good stability, output the advantage of electric current and voltage wide ranges etc.
Another object of the present utility model is to propose a kind of electri forklift.
For achieving the above object, a kind of charging system for electri forklift that the utility model proposes on the one hand, comprising: electrokinetic cell; Charging device, one end of described charging device is connected with the alternating current of input, and the other end of described charging device is connected with described electrokinetic cell, and the alternating current of described charging device to described input converts the first direct current exporting the described electrokinetic cell of supply; Three-phase alternating voltage, the three-phase alternating current of the alternating current of the described input of real-time detection exchange checkout gear with phase place; The charging voltage of the described electrokinetic cell of real-time detection and the DC detecting device of charging current; And controller, described controller exchanges checkout gear with described respectively, described DC detecting device is connected with described charging device, the described charging voltage that described controller detects according to described DC detecting device and charging current judge the mode of operation of described charging device, and the described charging voltage that detects of the three-phase alternating voltage of the alternating current of the described input detected according to described interchange checkout gear, three-phase alternating current, phase place and described DC detecting device and charging current control described charging device to regulate described first galvanic voltage range.
According to the charging system for electri forklift of the present utility model, the charging voltage that controller detects according to DC detecting device and charging current judge the mode of operation of charging device, and according to exchanging charging voltage that the three-phase alternating voltage of alternating current of the input that checkout gear detects, three-phase alternating current, phase place and DC detecting device detect and charging current controls charging device to regulate the first galvanic voltage range to power battery charging.Therefore, charging system for electri forklift of the present utility model can not only realize the quick charge to electrokinetic cell, and have that design architecture is simple, good stability, the electric current and voltage wide ranges of output, precision is high, control is convenient etc. advantage, also be applicable for the charging voltage electrokinetic cell changed greatly, and in the process of power battery charging, charging device can work in different mode of operations, improves the efficiency of charging.
Wherein, described mode of operation comprises constant voltage charge pattern and constant current charging mode.
Further, described first galvanic voltage range is 0-600V.
Particularly, described charging device comprises: electromagnetic interference EMI (Electromagnetic Interference, electromagnetic interference) filter circuit, one end of described EMI filter circuit is connected with the alternating current of described input, and the alternating current of described EMI filter circuit to described input processes to export the first alternating current; Rectification circuit, one end of described rectification circuit is connected with the other end of described EMI filter circuit, and described first alternating current is converted to the second direct current by described rectification circuit; DC filtering circuit, one end of described DC filtering circuit is connected with the other end of described rectification circuit, the other end of described DC filtering circuit is connected with described electrokinetic cell, and described DC filtering circuit carries out filtering process to export described first direct current to described second direct current.
Particularly, described interchange checkout gear comprises: alternating voltage and phase detection unit, one end of described alternating voltage and phase detection unit is connected with one end of described EMI filter circuit, and the other end of described alternating voltage and phase detection unit is connected with described controller; Alternating current detecting unit, one end of described alternating current detecting unit is connected with the other end of described EMI filter circuit, and the other end of described alternating current detecting unit is connected with described controller.
Particularly, described DC detecting device comprises: direct current detection unit, and one end of described direct current detection unit is connected with one end of described electrokinetic cell, and the other end of described direct current detection unit is connected with described controller; Direct voltage detecting unit, described direct voltage detecting unit is connected to the two ends of described electrokinetic cell, and described direct voltage detecting unit is connected with described controller.
Particularly, described controller comprises main control chip and isolation drive unit, and described isolation drive unit comprises electrical isolation and self-excitation drive circuit.
Preferably, the operating frequency of described main control chip is 40MHz.
Preferably, described rectification circuit is three-phase full-bridge controlled rectifier, and described DC filtering circuit is LC filter circuit.
In addition, the utility model also proposed a kind of electri forklift, and it comprises the above-mentioned charging system for electri forklift.
This electri forklift achieves the quick charge to the electrokinetic cell on electri forklift by the above-mentioned charging system for electri forklift, improves the charge efficiency of electrokinetic cell, makes its range of application more extensive.
The aspect that the utility model is additional and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
The utility model above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the circuit block diagram of the charging system for electri forklift according to the utility model embodiment;
Fig. 2 is the software flow pattern of the charging system for electri forklift according to the utility model embodiment; And
Fig. 3 is the charging current time history plot of the ferric phosphate lithium cell according to the utility model embodiment.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the utility model.In addition, the utility model can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In description of the present utility model, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Describe the charging system for electri forklift that proposes according to the utility model embodiment with reference to the accompanying drawings and there is this electri forklift for the charging system of electri forklift.
Fig. 1 is the circuit block diagram of the charging system for electri forklift according to the utility model embodiment.As shown in Figure 1, this charging system being used for electri forklift comprises: electrokinetic cell 10, charging device, interchange checkout gear 30, DC detecting device 40 and controller 50.
Wherein, one end of charging device is connected with the alternating current of input, and the other end of charging device is connected with electrokinetic cell 10, and the alternating current of charging device to input converts the first direct current exporting supply electrokinetic cell 10.Exchange checkout gear 30 for detecting the three-phase alternating voltage of the alternating current of input, three-phase alternating current and phase place in real time, DC detecting device 40 is for detecting charging voltage and the charging current of electrokinetic cell 10 in real time.Controller 50 respectively with exchange checkout gear 30, DC detecting device 40 is connected with charging device, the charging voltage that controller 50 detects according to DC detecting device 40 and charging current judge the mode of operation of charging device, and according to exchanging charging voltage that the three-phase alternating voltage of alternating current of the input that checkout gear 30 detects, three-phase alternating current, phase place and DC detecting device 40 detect and charging current controls charging device to regulate the first galvanic voltage range.
In embodiment of the present utility model, the mode of operation of charging device comprises constant voltage charge pattern and constant current charging mode.
In embodiment of the present utility model, first galvanic voltage range can be 0-600V, namely when the alternating current inputted is 380V electric main, this charging system can control between 0-600V flexibly to the first galvanic voltage exported, and then show that this charging system is also applicable for charging voltage change electrokinetic cell 10 greatly, and charge efficiency is higher.
According to an embodiment of the present utility model, as shown in Figure 1, charging device comprises EMI filter circuit 201, rectification circuit 202 and DC filtering circuit 203.Wherein, one end of EMI filter circuit 201 is connected with the alternating current of input, and the alternating current of EMI filter circuit 201 to input processes to export the first alternating current.One end of rectification circuit 202 is connected with the other end of EMI filter circuit 201, and the first alternating current is converted to the second direct current by rectification circuit 202.One end of DC filtering circuit 203 is connected with the other end of rectification circuit 202, and the other end of DC filtering circuit 203 is connected with electrokinetic cell 10, and DC filtering circuit 203 carries out filtering process to export the first direct current to the second direct current.
Preferably, rectification circuit 202 can be three-phase full-bridge controlled rectifier, and DC filtering circuit 203 can be LC filter circuit.
Specifically, as shown in Figure 1, EMI filter circuit 201 comprises multiple resistance and multiple inductance, wherein, one end after first resistance R1 connects with the first inductance L 1 is connected to carry out filtering to Ua phase with the Ua phase of the alternating current of input, one end after second resistance R2 connects with the second inductance L 2 is connected to carry out filtering to Ub phase with the Ub phase of the alternating current of input, one end after 3rd resistance R3 connects with the 3rd inductance L 3 is connected to carry out filtering to Uc phase with the Uc phase of the alternating current of input, thus filtering is carried out with stable output to alternating current such as the 380V electric main of input, the first level and smooth alternating current.
Rectification circuit 202 is made up of 6 power switch pipes, wherein, every two power switch pipes form a brachium pontis, form three brachium pontis altogether, the source electrode of the upper brachium pontis power switch pipe of each brachium pontis is connected with the drain electrode of lower brachium pontis power switch pipe, the intermediate node of three brachium pontis connect with the first resistance R1 in EMI filter circuit 201 and the first inductance L 1 respectively after the other end, the other end after the other end after second resistance R2 connects with the second inductance L 2 and the 3rd resistance R3 connect with the 3rd inductance L 3 is connected, and, the drain electrode of the upper brachium pontis power switch pipe of three brachium pontis is connected, the source electrode of the lower brachium pontis power switch pipe of three brachium pontis is connected.
DC filtering circuit 203 comprises the 4th inductance L 4 and the first electric capacity C1, wherein one end of the 4th inductance L 4 is connected with the drain electrode of the upper brachium pontis power switch pipe in rectification circuit 202, the other end of the 4th inductance L 4 is connected respectively with the positive pole of the first electric capacity C1, the positive pole of electrokinetic cell 10, the negative pole of the first electric capacity C1 is connected respectively with the source electrode of lower brachium pontis power switch pipe in rectification circuit 202, the negative pole of electrokinetic cell 10, the potential pulse interference exported with filtering rectification circuit 202, makes the first direct current of output stable, level and smooth.
According to an embodiment of the present utility model, as shown in Figure 1, exchange checkout gear 30 and comprise alternating voltage and phase detection unit 301 and alternating current detecting unit 302.Wherein, one end of alternating voltage and phase detection unit 301 is connected with one end of EMI filter circuit 201, the other end of alternating voltage and phase detection unit 301 is connected with controller 50, one end of alternating current detecting unit 302 is connected with the other end of EMI filter circuit 201, and the other end of alternating current detecting unit 302 is connected with controller 50.
Further, as shown in Figure 1, DC detecting device 40 comprises direct current detection unit 401 and direct voltage detecting unit 402.Wherein, one end of direct current detection unit 401 is connected with one end of electrokinetic cell 10, the other end of direct current detection unit 402 is connected with controller 50, and direct voltage detecting unit 402 is connected to the two ends of electrokinetic cell 10, and direct voltage detecting unit 402 is connected with controller 50.
In addition, as shown in Figure 1, controller 50 comprises main control chip 501 and isolation drive unit 502, and wherein, isolation drive unit 502 comprises electrical isolation and self-excitation drive circuit.
Preferably, the operating frequency of main control chip 501 can be 40MHz.
Specifically, as shown in Figure 1, one end of alternating voltage and phase detection unit 301 is connected with Ua, Ub, Uc phase of alternating current as 380V electric main of input respectively, the other end of alternating voltage and phase detection unit 301 is connected with main control chip 501, to detect three-phase alternating voltage and the phase place of the alternating current of input in real time, and send to main control chip 501.Wherein, the object detecting the phase place of three-phase alternating current is SVPWM (the Space Vector Pulse Width Modulation preventing the alternating current reversal connection inputted from exporting main control chip 501, space vector pulse width modulation) have an impact, specifically, main control chip 501 can according to the angle polarity of the phase change coordinate system transformation of the three-phase alternating current detected, thus correct output SVPWM signal, automatically realize the anti-reverse function of input.
One end of alternating current detecting unit 302 connect with the first inductance L 1 with the first resistance R1 in EMI filter circuit 201 respectively after the other end, the second resistance R2 connect with the second inductance L 2 after the other end be connected, the electric current of the first alternating current exported with the electric current and EMI filter circuit 201 that detect the first inductance L 1, second inductance L 2 in real time, and send to main control chip 501.
Direct current detection unit 401 detects the charging current of electrokinetic cell 10 in real time, prevents overcurrent and short circuit, and the charging current of detection is sent to main control chip 501 as the direct current feedback signal of software control.
Direct voltage detecting unit 402 detects the charging voltage of electrokinetic cell 10 and the voltage at electrokinetic cell 10 two ends in real time, prevents overvoltage, and the charging voltage of detection is sent to main control chip 501 as the direct voltage feedback signal of software control.
The operating frequency requirements of main control chip 501 reaches more than 40MHz, and main control chip 501 also should have high-speed a/d data acquisition, Fast Software mathematical operation, the logical relation of process complexity and the function of the multiple program interrupt of convenient setting.
Wherein, the software work principle of main control chip 501 is: when charging system works, the three-phase alternating voltage Ua that alternating voltage and phase detection unit 301 and alternating current detecting unit 302 will detect, Ub, Uc and two-phase alternating current ia, ib sends to main control chip 501, the two-phase alternating current ia that main control chip 501 will obtain, ib carries out Clack conversion and Park conversion, the two-phase alternating current ia under rest frame, ib is transformed to the Isa under rotating coordinate system, Isb, thus the ER effect of the three-phase alternating current of amplitude and the equal real-time change of phase place in order to steady state value.Simultaneously, main control chip 501 carries out difference the charging voltage that the magnitude of voltage of default output and direct voltage detecting unit 402 detect, and PI (Proportional Integral is carried out to the voltage difference that difference obtains, proportional integral) regulate computing, then the data of output and Isa and Isb are carried out PI to regulate and obtain Urd and Urq, Ura and Urb is obtained under finally Urd and Urq under rotating coordinate system being transformed to rest frame, and carry out phase place and amplitude calculating according to Ura and Urb, thus generate SVPWM driving pulse.
According to an example of the present utility model, as shown in Figure 2, the software workflow of control chip 501 comprises the following steps:
S101, interrupt service routine starts.
S102, detects three-phase alternating voltage Ua, Ub, Uc and two-phase alternating current ia, ib.
S103, three phase static coordinate obtains Isa, Isb to two-phase rotating coordinate transformation.
The PI of S104, charging voltage Udc regulates, and obtains I`sa.
The PI of S105, Isa and I`sa regulates and the PI of Isb and 0 regulates, and obtains Urd and Urq.
S106, two cordic phase rotators obtain Ura and Urb to three phase static coordinate transform.
S107, calculates angle and driving time.
S108, generates SVPWM driving pulse.
S109, interrupts returning.
In addition, isolation drive unit 502 one end is connected with main control chip 501, the other end of isolation drive unit 502 is connected with the grid of the power switch pipe in rectification circuit 202, isolation drive unit 502 controls the turn-on and turn-off of power switch pipe in real time according to the SVPWM driving pulse that main control chip 501 exports, and carries out rectification to drive rectification circuit 202 to the first alternating current.
Further, the charging voltage of the electrokinetic cell 10 detected and charging current are sent to main control chip 501 by direct current detection unit 401 and direct voltage detecting unit 402, according to charging voltage and charging current, the software in main control chip 501 judges that charging device works in constant current charging mode or constant voltage charge pattern.When main control chip 501 judges that charging device works in constant current charging mode, this main control chip 501 the charging current detected and the default current vs exported, and carries out PI regulable control, obtains I`sa; When main control chip 501 judges that charging device works in constant voltage charge pattern, this main control chip 501 the charging voltage detected and the default voltage-contrast exported, and carries out PI regulable control, obtains I`sa.The two-phase alternating current ia of the alternating current of input that alternating current detecting unit 302 will detect, ib sends to main control chip 501, main control chip 501 is to the two-phase alternating current ia detected, ib carries out rotational coordinates change and obtains Isa, Isb, and I`sa and Isa is carried out PI regulable control obtain Urd, Isb and 0 is carried out PI regulable control and obtains Urq, then main control chip 501 is the Urd under rotating coordinate system, Urq obtains Ura under transforming to rest frame, Urb, and according to Ura, Urb calculates angle and driving time, conducting and the shutoff of power switch pipe in rectifier 202 is controlled in real time by isolation drive unit 502, thus realize the first galvanic stable output.
Wherein, it should be noted that, owing to adopting software control charging, therefore accurately can control namely accurately to control the second direct current that rectifier 202 exports to the charging voltage of electrokinetic cell 10 and charging current.When the electric current of the second direct current that the second galvanic voltage that rectifier 202 exports is too high or export is too large, I`sa, Isa and Isb that main control chip 501 obtains diminish, after PI regulates, Urd and Urq exported also can diminish, Ura and Urb after coordinate transform also will diminish, thus the second galvanic voltage of output or the second galvanic electric current are diminished.When the second galvanic electric current that the second galvanic voltage that rectifier 202 exports is too low or export is too little, in like manner also can fast the second galvanic voltage and current exported be stabilized in the scope of requirement.
In addition, in embodiment of the present utility model, electrokinetic cell 10 can be lead-acid battery, ferric phosphate lithium cell or other any lithium battery.Wherein, when electrokinetic cell 10 is ferric phosphate lithium cell, need larger rate of charge can realize quick charge to ferric phosphate lithium cell, use charging system of the present utility model that 3C (charging current is three times of the ferric phosphate lithium cell charging current of nominal) charging modes can be adopted to carry out quick charge to ferric phosphate lithium cell, namely 15 minutes ferric phosphate lithium cells just can be full of 75%, within 30 minutes, can be full of completely, curve is as shown in Figure 3 over time for its charging current, as shown in Figure 3, in the charging incipient stage, charging system adopts constant current charging mode to charge to ferric phosphate lithium cell, charging current is 3C, ferric phosphate lithium cell charges under this electric current, do not affect battery behavior completely, when reaching set point, constant voltage charge pattern is adopted to charge to ferric phosphate lithium cell.
In sum, according to the charging system for electri forklift of the present utility model, the charging voltage that controller detects according to DC detecting device and charging current judge the mode of operation of charging device, and according to exchanging charging voltage that the three-phase alternating voltage of alternating current of the input that checkout gear detects, three-phase alternating current, phase place and DC detecting device detect and charging current controls charging device to regulate the first galvanic voltage range to power battery charging.Therefore, charging system for electri forklift of the present utility model can not only realize the quick charge to electrokinetic cell, and have that design architecture is simple, good stability, the electric current and voltage wide ranges of output, precision is high, control is convenient etc. advantage, also be applicable for the charging voltage electrokinetic cell changed greatly, and in the process of power battery charging, charging device can work in different mode of operations, improves the efficiency of charging.
In addition, the utility model also proposed a kind of electri forklift, and it comprises the above-mentioned charging system for electri forklift.
This electri forklift achieves the quick charge to the electrokinetic cell on electri forklift by the above-mentioned charging system for electri forklift, improves the charge efficiency of electrokinetic cell, makes its range of application more extensive.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and spirit, scope of the present utility model is by claims and equivalency thereof.
Claims (10)
1. for a charging system for electri forklift, it is characterized in that, comprising:
Electrokinetic cell;
Charging device, one end of described charging device is connected with the alternating current of input, and the other end of described charging device is connected with described electrokinetic cell, and the alternating current of described charging device to described input converts the first direct current exporting the described electrokinetic cell of supply;
Three-phase alternating voltage, the three-phase alternating current of the alternating current of the described input of real-time detection exchange checkout gear with phase place;
The charging voltage of the described electrokinetic cell of real-time detection and the DC detecting device of charging current; And
Controller, described controller exchanges checkout gear with described respectively, described DC detecting device is connected with described charging device, the described charging voltage that described controller detects according to described DC detecting device and charging current judge the mode of operation of described charging device, and the described charging voltage that detects of the three-phase alternating voltage of the alternating current of the described input detected according to described interchange checkout gear, three-phase alternating current, phase place and described DC detecting device and charging current control described charging device to regulate described first galvanic voltage range.
2., as claimed in claim 1 for the charging system of electri forklift, it is characterized in that, described charging device comprises:
Electromagnetic interference EMI filter circuit, one end of described EMI filter circuit is connected with the alternating current of described input, and the alternating current of described EMI filter circuit to described input processes to export the first alternating current;
Rectification circuit, one end of described rectification circuit is connected with the other end of described EMI filter circuit, and described first alternating current is converted to the second direct current by described rectification circuit;
DC filtering circuit, one end of described DC filtering circuit is connected with the other end of described rectification circuit, the other end of described DC filtering circuit is connected with described electrokinetic cell, and described DC filtering circuit carries out filtering process to export described first direct current to described second direct current.
3., as claimed in claim 2 for the charging system of electri forklift, it is characterized in that, described interchange checkout gear comprises:
Alternating voltage and phase detection unit, one end of described alternating voltage and phase detection unit is connected with one end of described EMI filter circuit, and the other end of described alternating voltage and phase detection unit is connected with described controller;
Alternating current detecting unit, one end of described alternating current detecting unit is connected with the other end of described EMI filter circuit, and the other end of described alternating current detecting unit is connected with described controller.
4., as claimed in claim 2 for the charging system of electri forklift, it is characterized in that, described DC detecting device comprises:
Direct current detection unit, one end of described direct current detection unit is connected with one end of described electrokinetic cell, and the other end of described direct current detection unit is connected with described controller;
Direct voltage detecting unit, described direct voltage detecting unit is connected to the two ends of described electrokinetic cell, and described direct voltage detecting unit is connected with described controller.
5. the charging system for electri forklift according to any one of claim 1-4, is characterized in that, described controller comprises main control chip and isolation drive unit, and described isolation drive unit comprises electrical isolation and self-excitation drive circuit.
6., as claimed in claim 5 for the charging system of electri forklift, it is characterized in that, the operating frequency of described main control chip is 40MHz.
7., as claimed in claim 2 for the charging system of electri forklift, it is characterized in that, described rectification circuit is three-phase full-bridge controlled rectifier, and described DC filtering circuit is LC filter circuit.
8., as claimed in claim 1 for the charging system of electri forklift, it is characterized in that, described mode of operation comprises constant voltage charge pattern and constant current charging mode.
9., as claimed in claim 1 for the charging system of electri forklift, it is characterized in that, described first galvanic voltage range is 0-600V.
10. an electri forklift, is characterized in that, comprises as claimed in any one of claims 1-9 wherein for the charging system of electri forklift.
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