CN204681082U - A kind of electric tricycle charger IGBT current foldback circuit - Google Patents
A kind of electric tricycle charger IGBT current foldback circuit Download PDFInfo
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- CN204681082U CN204681082U CN201520372833.0U CN201520372833U CN204681082U CN 204681082 U CN204681082 U CN 204681082U CN 201520372833 U CN201520372833 U CN 201520372833U CN 204681082 U CN204681082 U CN 204681082U
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Abstract
The utility model belongs to electro-tricycle technical field, provide a kind of electric tricycle charger IGBT current foldback circuit, comprise: insulated gate bipolar transistor IGBT one end ground connection, one end is connected with the first diode anode, and the other end is connected with switching power source chip; Photoelectrical coupler one end ground connection, one end is connected with input voltage, and one end is connected with reference voltage 5V input, and one end is connected on switching power source chip; Integrated operational amplifier positive input is connected to photoelectrical coupler, and reverse input end one end is connected to reference voltage 5V input, output be connected on switching power source chip.When the utility model utilizes IGBT that overcurrent occurs, the characteristic that voltage between Collector Emitter can increase greatly and linearly along with collector emitter ER effect, detect magnitude of voltage and then judge whether IGBT is in over-current state, improve the reliability of testing circuit, can not misjudgment phenomenon be produced, ensure that the reliable useful life of battery and charger internal circuit devcie.
Description
Technical field
The utility model belongs to electro-tricycle technical field, particularly a kind of electric tricycle charger IGBT current foldback circuit.
Background technology
Current electro-tricycle has become the most widely used environmental protection vehicles of China, how not only fast but also charging of having got well seem very important, this just needs to have to ensure electro-tricycle storage battery safety and reliable charging method.
Current most of charging circuit adopts electro-tricycle accumulator equipment to charge, and its charging circuit arranges comparatively simple, and charging process is extremely single, and charging current is less, and charge efficiency is very low.The main cause occurring these problems is caused to be that the protection act of the detection of electric tricycle charger and protective circuit is enough not reliable and stable; Can not while improving charger charge efficiency automatically to charging process in the various fortuitous events that occur carry out sensitively promptly protecting, such as temporary impact electric current, circuit overcurrent, circuit overvoltage, charger temperature rise the unexpected factor such as too fast; So when significantly not increasing cost, the protective circuit technology promoting charger is vital for electric tricycle charger.
During electric tricycle charger generation overcurrent, easily make the grid of IGBT out of hand, latching effect occurs, now the cut-off signals of grid lost efficacy, and collector current is crossed ambassador IGBT and damaged.And short circuit is the most serious overcurrent fault, when being short-circuited, electric current can reach the 4-5 of rated current doubly very soon, now must close device as soon as possible, otherwise device will damage very soon.
In the design of general high-power switching circuit, using the overcurrent of the emitter of resistance detection IGBT, turning off the pwm signal driving IGBT when there is overcurrent, realize the object of protection IGBT and main circuit.Resistance is for detecting the electric current of IGBT emitter.When load overcurrent or circuit are short-circuited, IGBT emitter current increases, and ohmically voltage raises, and inputs the voltage signal of pin 3 more than 1V of UC3842 after electric capacity C filtering, closes PWM drive singal; And then the charging current of limiting capacitance C.
But the weak point of this kind of IGBT current foldback circuit is:
1) current detection circuit structure is simple, and reliability is not high, and such as gate drive signal switching frequency is too fast causes the high voltage rate of change, and then causes emitter overcurrent to cause testing circuit false triggering drive singal to turn off.
2) lack signal conditioning circuit to the gate drive signal of input IGBT device, IGBT device itself also lacks necessary safeguard measure.
3) there is no electrical isolation measure between testing circuit and main circuit, easily affect chip and normally work.
Therefore; electro-tricycle technical field is badly in need of a kind of electric tricycle charger IGBT current foldback circuit; when utilizing IGBT that overcurrent occurs; the characteristic that voltage between Collector Emitter can increase greatly and linearly along with collector emitter ER effect; detect magnitude of voltage and then judge whether IGBT is in over-current state; improve the reliability of testing circuit; misjudgment phenomenon can not be produced; thus ensure that the reliable useful life of battery and charger internal circuit devcie, there is very large practical value and realistic meaning.
Summary of the invention
The utility model provides a kind of electric tricycle charger IGBT current foldback circuit, and technical scheme is as follows:
A kind of electric tricycle charger IGBT current foldback circuit, comprising: insulated gate bipolar transistor IGBT, the first diode, photoelectrical coupler, integrated dual operational amplifier and switching power source chip;
Insulated gate bipolar transistor IGBT, one end ground connection, one end is connected with the first diode anode, and the other end is connected with switching power source chip;
Photoelectrical coupler, one end is by series connection first grounding through resistance, one end is connected with input voltage by second resistance, and one end is connected with reference voltage 5V input by the 3rd resistance, and one end is connected on switching power source chip by the 4th resistance, the 5th resistance;
Integrated operational amplifier, positive input is connected between photoelectrical coupler and the 4th resistance, and reverse input end is by after 2 the 6th electric resistance partial pressures, and one end is connected to reference voltage 5V input, the other end is connected between the 4th resistance and the 5th resistance, and output is connected with the 7th resistance;
7th resistance, is connected on switching power source chip with after the 5th resistor coupled in parallel.
A kind of electric tricycle charger IGBT current foldback circuit as above; wherein; also comprise: modulate circuit; be made up of the second diode and the 8th resistance; after second diode and the 8th resistor coupled in parallel, one end is connected on insulated gate bipolar transistor IGBT, and the other end is connected with switching power source chip.
A kind of electric tricycle charger IGBT current foldback circuit as above; wherein; also comprise: protective circuit; for bi-directional voltage stabilizing diode; one end is connected to the 8th between resistance and insulated gate bipolar transistor IGBT, and the other end is connected between insulated gate bipolar transistor IGBT and earth terminal.
A kind of electric tricycle charger IGBT current foldback circuit as above, wherein, the model of integrated dual operational amplifier is LM358.
A kind of electric tricycle charger IGBT current foldback circuit as above, wherein, the model of photoelectrical coupler is TPL521.
A kind of electric tricycle charger IGBT current foldback circuit as above, wherein, the model of switching power source chip is UC3842.
The beneficial effects of the utility model:
1, the utility model increases photoelectrical coupler and integrated dual operational amplifier in circuit, and then when utilizing IGBT that overcurrent occurs, the characteristic that voltage between Collector Emitter can increase greatly and linearly along with collector emitter ER effect, detect magnitude of voltage, judge whether IGBT is in over-current state, improve the reliability of testing circuit.
2, switching power source chip of the present utility model adopts UC3842 chip, because it has Single-end output, the power of Direct driver single-ended flyback electric tricycle charger partly can lead device, inside comprises PWM latch, the effect that pulse current one by one controls can be realized, safer, reliable, operation is more prone to, and ensure that charge efficiency simultaneously.
3, due to the resistance to conveyance capacity of IGBT and resistance to overvoltage capabilities poor, once there is unexpected will damage.For this reason, must carry out relevant protection to IGBT, the utility model seals in resistance r3 and diode D1 parallel circuits at the gate input that UC3842 pin 6 controls, and resistance r3 plays the effect of restriction drive current.When IGBT positively biased is opened, diode D1 is in reverse-biased; During the reverse-biased shutoff of IGBT, diode D1 conducting makes grid remain on electronegative potential to accelerate to turn off, effectively prevent the infringement of IGBT, improve the useful life of IGBT.
4, the utility model is at IGBT grid bi-directional voltage stabilizing diode in parallel with between source electrode, and the over-voltage breakdown grid-source electrode preventing drive singal or the high voltage rate of change from producing, causes IGBT to damage, and improves the useful life of IGBT.
Accompanying drawing explanation
The utility model is described in detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the circuit diagram of a kind of electric tricycle charger IGBT of the utility model current foldback circuit embodiment 1.
Fig. 2 is the circuit diagram of a kind of electric tricycle charger IGBT of the utility model current foldback circuit embodiment 2.
Embodiment
In order to the utility model technology is realized measure, creation characteristic, reach object and effect is easy to understand, below in conjunction with concrete diagram, set forth the utility model further.
Embodiment 1:
Fig. 1 is the circuit diagram that a kind of electric tricycle charger IGBT of the utility model current foldback circuit implements 1.
As shown in Figure 1, a kind of electric tricycle charger IGBT current foldback circuit, comprising: insulated gate bipolar transistor IGBT, the first diode D1, photoelectrical coupler 1, integrated dual operational amplifier 2 and switching power source chip 3; Insulated gate bipolar transistor IGBT, one end ground connection, one end is connected with the first diode D1 anode, and the other end is connected with switching power source chip 3; Photoelectrical coupler 1, one end is by series connection first resistance R1 ground connection, one end is connected with input voltage by a second resistance R2, one end is connected with reference voltage 5V input by a 3rd resistance R3, and one end is connected on switching power source chip 3 by the 4th resistance R4, the 5th resistance r2; Integrated operational amplifier 2, positive input is connected between photoelectrical coupler 1 and the 4th resistance R4, reverse input end is by after 2 the 6th resistance R5, R6 dividing potential drops, one end is connected to reference voltage 5V input, the other end is connected between the 4th resistance R4 and the 5th resistance r2, and output is connected with the 7th resistance r1; 7th resistance r1, is connected on switching power source chip 3 after in parallel with the 5th resistance r2.
Fig. 2 is the circuit diagram of a kind of electric tricycle charger IGBT of the utility model current foldback circuit embodiment 2.
As shown in Figure 2, a kind of electric tricycle charger IGBT current foldback circuit, comprising: insulated gate bipolar transistor IGBT, the first diode D1, photoelectrical coupler 1, integrated dual operational amplifier 2, switching power source chip 3, modulate circuit 4 and protective circuit 5; Insulated gate bipolar transistor IGBT, one end ground connection, one end is connected with the first diode D1 anode; Photoelectrical coupler 1, one end is by series connection first resistance R1 ground connection, one end is connected with input voltage by a second resistance R2, one end is connected with reference voltage 5V input by a 3rd resistance R3, and one end is connected on switching power source chip 3 by the 4th resistance R4, the 5th resistance r2; Integrated operational amplifier 2, positive input is connected between photoelectrical coupler 1 and the 4th resistance R4, reverse input end is by after 2 the 6th resistance R5, R6 dividing potential drops, one end is connected to reference voltage 5V input, the other end is connected between the 4th resistance R4 and the 5th resistance r2, and output is connected with the 7th resistance r1; 7th resistance r1, is connected to after in parallel with the 5th resistance r2 on switching power source chip 3; Modulate circuit 4, is made up of the second diode D2 and the 8th resistance r3, and after the second diode D2 is in parallel with the 8th resistance r3, one end is connected on insulated gate bipolar transistor IGBT, and the other end is connected with switching power source chip 3; Protective circuit 5, be bi-directional voltage stabilizing diode, one end is connected between the 8th resistance r3 and insulated gate bipolar transistor IGBT, and the other end is connected between insulated gate bipolar transistor IGBT and earth terminal.
In the present embodiment, the model of integrated dual operational amplifier 2 is LM358.
In the present embodiment, the model of photoelectrical coupler 1 is TPL521.
In the present embodiment, the model of switching power source chip 3 is UC3842.
During utility model works, first assemble the utility model successively according to above-mentioned annexation, the voltage threshold of overcurrent condition is set, then by the link of IGBT and D1 access main circuit; When IGBT opens, the first diode D1 conducting also plays clamping action, when there is overcurrent, collector-emitter voltage Vcc raises, the voltage of diode D1 negative electrode increases, and photoelectrical coupler TPL521 base stage induced current raises, and photoelectrical coupler emitter voltage increases; Then the normal phase input end of integrated dual operational amplifier LM385 is input to, by comparing with 5 V reference voltages after resistance R5, R6 dividing potential drop, when the voltage of normal phase input end exceedes the voltage threshold of reverse input end, comparator exports high level on the pin 3 of switching power source chip UC3842, and then turn off PWM drive singal, switching power source chip 3 is played a protective role; When IGBT turns off, play the effect of isolation main circuit and other circuit, make the operating voltage of switching power source chip 3 more stable.
Due to the resistance to conveyance capacity of IGBT and resistance to overvoltage capabilities poor, once there is unexpected will damage.For this reason, must carry out relevant protection to IGBT, the gate input controlled by UC3842 pin 6 seals in resistance r3 and diode D1 parallel circuits, and resistance r3 plays the effect of restriction drive current.When IGBT positively biased is opened, diode D1 is in reverse-biased; During the reverse-biased shutoff of IGBT, diode D1 conducting makes grid remain on electronegative potential to accelerate to turn off, effectively prevent the infringement of IGBT, improve the useful life of IGBT.
The utility model is at IGBT grid bi-directional voltage stabilizing diode in parallel with between source electrode, and the over-voltage breakdown grid-source electrode preventing drive singal or the high voltage rate of change from producing, causes IGBT to damage, and improves the useful life of IGBT.
Switching power source chip of the present utility model has 8 pins, and pin 3 is connected with R3, temporary impact electric current can effectively be detected, and overcome in prior art the deficiency adopting transformer and thyristor.Because UC3842 adopts Single-end output, the power of Direct driver single-ended flyback electric tricycle charger partly leads device; Inside comprises PWM latch, can realize pulse current one by one and control; Its pin function is: (1) pin 1: input voltage is down to below 1V, PWM latch reset, and output pin no pulse exports; (2) pin 2: internal error amplifier inverting input, compares with in-phase input end 2.5V reference voltage and produces deviation voltage control impuls width; (3) pin 3: input voltage rises to more than 1V, PWM latch reset, output pin no pulse exports; (4) pin 4: external timing capacitor, timing resistor; (5) pin 5: ground connection (6) pin 6:PWM current impulse output; (7) pin 7: power input.As supply voltage occurs under-voltage (lower than shutoff threshold value 10V), output holding power device turns off.Because of the under-voltage protection function of chip itself, so without the need to designing under-voltage protecting circuit; (8) pin 8: accurate 5V reference voltage.
More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (6)
1. an electric tricycle charger IGBT current foldback circuit, is characterized in that, comprising: insulated gate bipolar transistor IGBT, the first diode, photoelectrical coupler, integrated dual operational amplifier and switching power source chip;
Described insulated gate bipolar transistor IGBT, one end ground connection, one end is connected with described first diode anode, and the other end is connected with described switching power source chip;
Described photoelectrical coupler, one end is by ground connection after series connection first resistance, one end is connected with input voltage by second resistance, one end is connected with reference voltage 5V input by the 3rd resistance, and one end is connected on described switching power source chip by the 4th resistance, the 5th resistance;
Described integrated operational amplifier, positive input is connected between described photoelectrical coupler and the 4th resistance, reverse input end is by after 2 the 6th electric resistance partial pressures, one end is connected to reference voltage 5V input, the other end is connected between described 4th resistance and the 5th resistance, and output is connected with the 7th resistance;
Described 7th resistance, is connected on switching power source chip with after described 5th resistor coupled in parallel.
2. a kind of electric tricycle charger IGBT current foldback circuit according to claim 1; it is characterized in that; also comprise: modulate circuit; be made up of the second diode and the 8th resistance; after described second diode and the 8th resistor coupled in parallel, one end is connected on insulated gate bipolar transistor IGBT, and the other end is connected with described switching power source chip.
3. a kind of electric tricycle charger IGBT current foldback circuit according to claim 2; it is characterized in that; also comprise: protective circuit; for bi-directional voltage stabilizing diode; one end is connected to the described 8th between resistance and insulated gate bipolar transistor IGBT, and the other end is connected between described insulated gate bipolar transistor IGBT and earth terminal.
4. a kind of electric tricycle charger IGBT current foldback circuit according to claim 1, is characterized in that, the model of described integrated dual operational amplifier is LM358.
5. a kind of electric tricycle charger IGBT current foldback circuit according to claim 1, is characterized in that, the model of described photoelectrical coupler is TPL521.
6. a kind of electric tricycle charger IGBT current foldback circuit according to claim 1, is characterized in that, the model of described switching power source chip is UC3842.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372833.0U CN204681082U (en) | 2015-06-03 | 2015-06-03 | A kind of electric tricycle charger IGBT current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372833.0U CN204681082U (en) | 2015-06-03 | 2015-06-03 | A kind of electric tricycle charger IGBT current foldback circuit |
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| CN204681082U true CN204681082U (en) | 2015-09-30 |
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| CN201520372833.0U Expired - Fee Related CN204681082U (en) | 2015-06-03 | 2015-06-03 | A kind of electric tricycle charger IGBT current foldback circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474626A (en) * | 2019-05-10 | 2019-11-19 | 中智电气南京有限公司 | A kind of IGBT protection circuit based on numerically controlled lathe servo-driver |
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2015
- 2015-06-03 CN CN201520372833.0U patent/CN204681082U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474626A (en) * | 2019-05-10 | 2019-11-19 | 中智电气南京有限公司 | A kind of IGBT protection circuit based on numerically controlled lathe servo-driver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20190603 |