CN202586293U - A leakage protection circuit of vehicle-mounted inverter and a corresponding vehicle-mounted inverter - Google Patents
A leakage protection circuit of vehicle-mounted inverter and a corresponding vehicle-mounted inverter Download PDFInfo
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- CN202586293U CN202586293U CN 201220026289 CN201220026289U CN202586293U CN 202586293 U CN202586293 U CN 202586293U CN 201220026289 CN201220026289 CN 201220026289 CN 201220026289 U CN201220026289 U CN 201220026289U CN 202586293 U CN202586293 U CN 202586293U
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Abstract
The utility model relates to a leakage protection circuit of vehicle-mounted inverter and a corresponding vehicle-mounted inverter. The leakage protection circuit comprises an insulation resistance detecting circuit, a comparison circuit, and an output time-delay circuit. The insulation resistance detecting circuit is connected with the AC output end of a vehicle-mounted inverter to detect the resistance to ground of the AC output end, and outputs the detected insulation resistance signal to the comparison circuit. If the insulation resistance is less than a preset value, the comparison circuit outputs a defective insulation signal to the output time-delay circuit. If duration time of the defective insulation signal exceeds a preset time, the output time-delay circuit outputs a leakage protection signal to a microcontroller in order to stop outputting AC voltage. The leakage protection circuit detects the insulation resistance to ground of the AC output end, and outputs the leakage protection signal to a boost microcontroller and an inversion microcontroller to stop outputting AC voltage if the insulation resistance to ground is less than the preset value so as to further prevent an accident of electric shock, or the inverter is rapidly stopped outputting to effectively protect personnel when the accident of electric shock happens.
Description
Technical field
The utility model relates to vehicle-mounted inverter technology field, more particularly, relates to a kind of leakage protection circuit and corresponding vehicle-mounted inverter of vehicle-mounted inverter.
Background technology
The module frame chart of existing vehicle-mounted inverter is as shown in Figure 1; Comprise DC filtering circuit 10, DC/DC booster circuit 20, DC/AC inverter circuit 30 and ac filter circuit 40, and the microcontroller 50 and be used to produce the inversion microcontroller 60 of PWM ripple control DC/AC inverter circuit 30 of boosting that is used to produce PWM ripple control DC/DC booster circuit 20.Direct current input back elder generation process DC filtering circuit 10 is to reduce ripple current and to suppress electromagnetic interference; Through DC/DC booster circuit 20 DC12V or DC24V are transformed to HVDC again; Through DC/AC inverter circuit 30 HVDC is converted to the square wave of SPWM Sine Wave Pulse Width Modulation then; Export the sine wave AC voltage of AC220V/50Hz or AC110V/60Hz at last through ac filter circuit 40, as passing through ac output end AC1 and AC2 output AC voltage.
When vehicle-mounted inverter only disposes two spring hole scokets, promptly only allow II electric appliances equipment to insert and use, because II electric appliances equipment adopts heavy insulation, use is safe.Yet, for the convenience of the user, when vehicle-mounted inverter need dispose Three-hole socket; Promptly allowing I electric appliances equipment to insert uses; For I electric appliances equipment, except AC power cord, also be provided with ground wire in addition; And generally be connected with the metal shell of electric equipment, safety requires to adopt earth leakage protective device to prevent electric shock accidents.Therefore, the major defect of existing vehicle-mounted inverter is not have leakage protection circuit or device, when adopting the Three-hole socket configuration, lacks the earth leakage protective of output AC voltage, uses dangerous.
The utility model content
The technical problem that the utility model will solve is, there is the defective of potential safety hazard in the earth leakage protective that lacks output AC voltage to existing vehicle-mounted inverter, and a kind of corresponding vehicle-mounted inverter of leakage protection circuit of vehicle-mounted inverter is provided.
The utility model solves the technical scheme that its technical problem adopted: the leakage protection circuit of constructing a kind of vehicle-mounted inverter; Said vehicle-mounted inverter comprises DC filtering circuit, DC/DC booster circuit, DC/AC inverter circuit and ac filter circuit, and boost microcontroller and the inversion microcontroller that is used to control the DC/AC inverter circuit that are used to control the DC/DC booster circuit; Said leakage protection circuit comprises: insulation resistance testing circuit, comparison circuit and output delay circuit;
Said insulation resistance testing circuit input is connected with the ac output end of said vehicle-mounted inverter, and output links to each other with said comparison circuit input, and the insulation resistance detection signal that produces is sent to said comparison circuit; Said comparison circuit output is connected with said output delay circuit input, and said comparison circuit receives said insulation resistance detection signal, and the defective insulation signal that when insulation resistance is lower than predetermined threshold value, produces sends to said output delay circuit; The output of said output delay circuit is connected with the said microcontroller that boosts; Said output delay circuit receives said defective insulation signal, and the earth leakage protective signal that after the duration surpasses Preset Time, produces sends to said inversion microcontroller and stops alternating voltage output.
In the leakage protection circuit according to the described vehicle-mounted inverter of the utility model, said output delay circuit also links to each other with the said microcontroller that boosts, and said earth leakage protective signal is sent to the said microcontroller that boosts stop the DC/DC boosting inverter.
In the leakage protection circuit according to the described vehicle-mounted inverter of the utility model, the said microcontroller that boosts also is connected with failure alarm circuit, receives said earth leakage protective signal and exports failure alarm signal.
In the leakage protection circuit according to the described vehicle-mounted inverter of the utility model, said leakage protection circuit also comprises the input filter circuit that is connected between said insulation resistance testing circuit and the comparison circuit.
In leakage protection circuit according to the described vehicle-mounted inverter of the utility model; Said comparison circuit further comprises: the peak value comparison circuit and the mean value comparison circuit of parallel connection; The input of said peak value comparison circuit and mean value comparison circuit links to each other with said input filter circuit output; Output inserts the output delay circuit, and the defective insulation signal that defective insulation signal that respectively peakedness ratio is produced and mean value relatively produce sends to said output delay circuit.
In leakage protection circuit according to the described vehicle-mounted inverter of the utility model; Said input filter circuit comprises the first amplifier U1A, capacitor C 4 and resistance R 24; The positive input of the said first amplifier U1A links to each other with the output of said insulation resistance testing circuit, and through capacitor C 4 ground connection; The signal output part of the said first amplifier U1A and positive input short circuit are formed voltage follower; The signal output part of the said first amplifier U1A is also through resistance R 24 ground connection and as the output of input filter circuit.
In the leakage protection circuit according to the described vehicle-mounted inverter of the utility model, said peak value comparison circuit comprises: the second amplifier U1B, resistance R 17, resistance R 10, resistance R 19, resistance R 20; The positive input of the said second amplifier U1B is connected to the output of said input filter circuit through resistance R 20; Said resistance R 10 and R19 are connected on and carry out dividing potential drop between operating voltage and the ground, and the node between said resistance R 10 and the R19 inserts the reverse input end of the second amplifier U1B; The signal output part of the said second amplifier U1B is through resistance R 17 ground connection, and access output delay circuit;
Said mean value comparison circuit comprises: the 3rd amplifier U1C, resistance R 18, resistance R 21, resistance R 22, resistance R 23 and capacitor C 3; The positive input of said the 3rd amplifier U1C is connected to the output of said input filter circuit through resistance R 23, and passes through capacitor C 3 ground connection; Said resistance R 21 and R22 are connected on and carry out dividing potential drop between operating voltage and the ground, and the node between said resistance R 21 and the R22 inserts the reverse input end of the 3rd amplifier U1C; The signal output part of said the 3rd amplifier U1C is through resistance R 18 ground connection, and access output delay circuit.
In the leakage protection circuit according to the described vehicle-mounted inverter of the utility model, said output delay circuit comprises capacitor C 2, four high guaily unit U1D, resistance R 12, resistance R 13, resistance R 14, resistance R 15 and resistance R 16.Wherein, Said peakedness ratio connects capacitor C 2 than circuit output end through resistance R 15; Mean value comparison circuit output also connects the same end of capacitor C 2 through resistance R 16, capacitor C 2 other end ground connection, and insert the positive input of said four high guaily unit U1D; Said resistance R 13 and resistance R 14 are connected on carries out dividing potential drop between operating voltage and the ground, and the node between said resistance R 13 and the resistance R 14 inserts the reverse input end of four high guaily unit U1D; The signal output part of said four high guaily unit U1D is through resistance R 12 ground connection, and as the output of said output delay circuit.
The utility model also provides a kind of vehicle-mounted inverter; Comprise DC filtering circuit, DC/DC booster circuit, DC/AC inverter circuit and ac filter circuit, and boost microcontroller and the inversion microcontroller that is used to control the DC/AC inverter circuit that are used to control the DC/DC booster circuit; Said vehicle-mounted inverter also comprises the leakage protection circuit of aforesaid vehicle-mounted inverter.
Implement the utility model vehicle-mounted inverter leakage protection circuit and adopt the vehicle-mounted inverter of this leakage protection circuit; Have following beneficial effect: the utility model detects the insulation resistance of the ac output end of vehicle-mounted inverter through adopting the insulation resistance testing circuit; And when being lower than predetermined threshold value, produce the defective insulation signal; The inversion microcontroller of the vehicle-mounted inverter of output earth leakage protective signal controlling stops alternating voltage output after surpassing Preset Time this signal duration; And then when electric shock accidents takes place, cut off inverter interchange output rapidly, and make vehicle-mounted inverter product can prevent electric shock accidents, protect user of service's safety effectively.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the module frame chart of existing vehicle-mounted inverter;
Fig. 2 is the module frame chart according to the vehicle-mounted inverter of the leakage protection circuit enforcement of the vehicle-mounted inverter of the utility model;
Fig. 3 is the schematic diagram of insulation resistance testing circuit in the leakage protection circuit of vehicle-mounted inverter of Fig. 2;
Fig. 4 is the schematic diagram of other circuit in the leakage protection circuit of vehicle-mounted inverter of Fig. 2.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.
The utility model provides a kind of leakage protection circuit to vehicle-mounted inverter, to guarantee when electric shock accidents takes place, to cut off rapidly the interchange output of vehicle-mounted inverter.
See also Fig. 2, be the module frame chart of the vehicle-mounted inverter implemented according to the leakage protection circuit of the vehicle-mounted inverter of the utility model.As shown in Figure 2, the leakage protection circuit 70 of the vehicle-mounted inverter that the utility model provides can carry out earth leakage protective to vehicle-mounted inverter.This vehicle-mounted inverter can as shown in Figure 1ly comprise DC filtering circuit 10, DC/DC booster circuit 20, DC/AC inverter circuit 30 and ac filter circuit 40, and boost microcontroller 50 and the inversion microcontroller 60 that is used to control DC/AC inverter circuit 30 that are used to control DC/DC booster circuit 20.The leakage protection circuit 70 of the vehicle-mounted inverter that the utility model provides comprises insulation resistance testing circuit 71, comparison circuit 72 and output delay circuit 73 at least.
Wherein, insulation resistance testing circuit 71 inputs are connected with AC2 with the ac output end AC1 of vehicle-mounted inverter, detect ac output end AC1, AC2 insulation resistance over the ground, produce the insulation resistance detection signal.
The input of comparison circuit 72 is connected with the output of insulation resistance testing circuit 71; Receive the insulation resistance detection signal that insulation resistance testing circuit 71 produces; And with predetermined threshold value relatively; When judging insulation resistance, think insulation resistance, therefore produce the defective insulation signal less than safety value less than predetermined threshold value.Particularly, realize that through the voltage of judging the insulation resistance detection signal insulation resistance is more little, the voltage of generation is big more.Therefore, set the limit value of a voltage, the voltage limit value that is higher than this setting when the voltage of insulation resistance detection signal is then judged insulation resistance less than safety value, produces the high level signal of expression defective insulation.
The output delay circuit 73 of leakage protection circuit 70 can also send to the earth leakage protective signal inversion microcontroller 60 and boost microcontroller 50 simultaneously in the utility model; Inversion microcontroller 60 stops the DC/AC inversion after receiving the earth leakage protective signal immediately, makes to exchange to export to stop fast.The microcontroller 50 that boosts also stops the DC/DC boosting inverter after receiving the earth leakage protective signal immediately, and then the microcontroller 50 of avoiding when stopping output AC voltage, boosting has increased fail safe and reduced loss also in work.This microcontroller 50 that boosts can also further be connected with failure alarm circuit, receives the earth leakage protective signal and exports failure alarm signal prompting user.
Specifically introduce in the face of the circuit theory of each functional circuit of the leakage protection circuit of the vehicle-mounted inverter of the utility model down.See also Fig. 3 and Fig. 4, be respectively the circuit theory diagrams of insulation resistance testing circuit and remaining circuit among Fig. 2.
As shown in Figure 3, insulation resistance testing circuit 71 is connected with AC2 with the ac output end AC1 of vehicle-mounted inverter.Ac output end AC1 connects the anode of diode D1; Ac output end AC2 connects the anode of diode D2; The negative electrode of diode D1 and diode D2 links together, and through a plurality of resistance, connects the input DC side common port of vehicle-mounted inverter like resistance R 1-resistance R 7.The DC side of vehicle-mounted inverter is meant the former limit part of DC filtering circuit 10 and DC/DC booster circuit 20, and AC side is meant DC/AC inverter circuit 30 and ac filter circuit 40.Resistance R 1 and resistance R 2 two ends shunt regulator tube ZD1.Node voltage VIR between resistance R 1 and the resistance R 2 is output insulation resistance detection signal.The insulation resistance over the ground of ac output end AC1 representes that with R8 the insulation resistance over the ground of ac output end AC2 is represented with R9.Bad or when electric shock accidents takes place when the AC side insulation against ground, resistance R 8 is with the resistance of resistance R 9 or reduce individually or simultaneously, and the electric current that flows through resistance R 1-R7 increases, and the magnitude of voltage of insulation resistance detection signal VIR increases.
To adopt puncture voltage be the transient voltage restraining diode of 400V for diode D1 and diode D2 in the vehicle-mounted inverter instance of the utility model, not only can suppress interference voltage, and the voltage-withstand test can stand production the time.If diode D1 and diode D2 adopt general-purpose diode, the insulating monitoring protective circuit also has said function, but need select high-tension diode for use, and product just can be done voltage-withstand test.
As shown in Figure 4, input filter circuit 74 comprises that the positive input of the first amplifier U1A, capacitor C 4, resistance R 11 and resistance R 24, the first amplifier U1A links to each other with the output of insulation resistance testing circuit 71 through resistance R 11, and through capacitor C 4 ground connection.The signal output part of the first amplifier U1A is through resistance R 24 ground connection, and output and positive input short circuit, forms voltage follower, as the output of input filter circuit 74.The insulation resistance detection signal carries out filtering, and carries out exporting to comparison circuit 72 after the filtering through the first amplifier U1A through resistance R 11, capacitor C 4.
Particularly, peak value comparison circuit 721 comprises the second amplifier U1B, resistance R 17, resistance R 10, resistance R 19 and resistance R 20.Resistance R 10 and R19 are connected between operating voltage such as 5V and the ground and carry out dividing potential drop, and the reverse input end that the node between said resistance R 10 and the R19 inserts the second amplifier U1B is as peak threshold voltage relatively.The positive input of the second amplifier U1B is connected to the output of filter amplification circuit 74 through resistance R 20, and the signal output part of the second amplifier U1B is through resistance R 17 ground connection.When the positive input voltage of the second amplifier U1B was higher than reverse input end voltage, the defective insulation signal of the signal output part of second amplifier U1B output high level was given output delay circuit 73.
Mean value comparison circuit 722 comprises the 3rd amplifier U1C, resistance R 18, resistance R 21, resistance R 22, resistance R 23 and capacitor C 3.Resistance R 21 and R22 are connected between operating voltage such as 5V and the ground and carry out dividing potential drop, and the reverse input end that the node between said resistance R 21 and the R22 inserts the 3rd amplifier U1C is as mean value threshold voltage relatively.The positive input of the 3rd amplifier U1C is connected to the output of filter amplification circuit 74 through resistance R 23, and the positive input of the 3rd amplifier U1C is also through capacitor C 3 ground connection, and the signal output part of the 3rd amplifier U1C is through resistance R 18 ground connection.Filtered insulation resistance detection signal charges through 23 pairs of capacitor C 3 of resistance R; The mean value of insulation resistance detection signal is exported to the positive input of the 3rd amplifier U1C; When its voltage was higher than reverse input end voltage, the defective insulation signal of the signal output part of the 3rd amplifier U1C output high level was given output delay circuit 73.
Possibly have only wherein one the tunnel among the ac output end AC1 of vehicle-mounted inverter and the AC2, also maybe two-way to occur insulation against ground simultaneously bad.When having only one the tunnel insulation against ground poor insulation resistance R 8 resistances to occur and descend like AC1; Other one the tunnel when still being infinitely great like AC2 insulation against ground good insulation resistance R 9 resistances; AC2 arrives AC1 again and forms the loop through diode D2, resistance R 1～R7 and resistance R 8, produces loop current; Because resistance R 9 open circuits, AC1 can not pass through diode D1, resistance R 1～R7 and resistance R 9, arrives AC2 again and forms the loop, does not have loop current, and this moment, insulation resistance detection signal VIR was sinusoidal wave half wave rectification wave.When AC1 and AC2 two-way occurred insulation against ground poor insulation resistance R 8 simultaneously and descend with the R9 resistance, AC1 was through diode D1, resistance R 1～R7, and AC1 is also through resistance R 8; Through resistance R 9, arrive AC2 again and form the loop again, produce loop current; And AC2 passes through diode D2, resistance R 1～R7, and AC2 is also through resistance R 9, again through resistance R 8; Arrive AC1 again and form the loop, produce loop current, this moment, insulation resistance detection signal VIR was sinusoidal wave current waveform in full-wave rectifier.To occur insulation against ground simultaneously bad when AC1 and AC2 two-way; Insulation against ground to occur identical when bad even the insulation resistance resistance is with having only one the tunnel; Because the influence of parallel connection shunting; Insulation resistance detection signal VIR amplitude is reduced greatly; Can not reach peak value comparison circuit 721 preset threshold voltages and produce the high level signal of defective insulation, but insulation resistance detection signal VIR was sinusoidal wave current waveform in full-wave rectifier this moment that mean value comparison circuit 722 can detect and export the defective insulation signal effectively.This shows that no matter vehicle-mounted inverter takes place one the tunnel or the two-way fault, the comparison circuit 72 that is made up of peak value comparison circuit 721 and mean value comparison circuit 722 can both detect insulation resistance effectively less than preset insulation resistance threshold value.
The utility model is also corresponding to provide a kind of vehicle-mounted inverter; It comprises DC filtering circuit 10 as shown in Figure 1, DC/DC booster circuit 20, DC/AC inverter circuit 30 and ac filter circuit 40, and boost microcontroller 50 and the inversion microcontroller 60 that is used to control DC/AC inverter circuit 30 that are used to control DC/DC booster circuit 20.The vehicle-mounted inverter that the utility model provides also comprises the leakage protection circuit of vehicle-mounted inverter as implied above, leakage protection circuit 70 as shown in Figure 2.
To sum up; The utility model provides a kind of insulating monitoring and leakage protection circuit of vehicle-mounted inverter; Through adopting the insulation resistance testing circuit that the insulation resistance of the ac output end of vehicle-mounted inverter is detected; And when being lower than predetermined threshold value, produce the defective insulation signal; The inversion microcontroller of the vehicle-mounted inverter of output earth leakage protective signal controlling stops the DC/AC inversion after this signal continue to surpass Preset Time, cuts off inverter rapidly when bad and exchanges output the output AC voltage insulation against ground occurring.The utility model technical scheme makes vehicle-mounted inverter product meet relevant safety requirement fully; Insulation against ground inverter prevention electric shock accidents that quits work when bad appears in the product that uses as the user, thereby and in case when electric shock accidents takes place inverter stop to export the safety of protecting the user of service effectively rapidly.
The utility model is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the utility model scope, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the utility model technology, can carry out many modifications and not break away from its protection range the utility model.Therefore, the utility model is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (9)
1. the leakage protection circuit of a vehicle-mounted inverter; Said vehicle-mounted inverter comprises DC filtering circuit, DC/DC booster circuit, DC/AC inverter circuit and ac filter circuit, and boost microcontroller and the inversion microcontroller that is used to control the DC/AC inverter circuit that are used to control the DC/DC booster circuit; It is characterized in that said leakage protection circuit comprises: insulation resistance testing circuit, comparison circuit and output delay circuit;
Said insulation resistance testing circuit input is connected with the ac output end of said vehicle-mounted inverter, and output links to each other with said comparison circuit input, and the insulation resistance detection signal that produces is sent to said comparison circuit;
Said comparison circuit output is connected with said output delay circuit input, and said comparison circuit receives said insulation resistance detection signal, and the defective insulation signal that will when insulation resistance is lower than predetermined threshold value, produce sends to said output delay circuit;
The output of said output delay circuit is connected with the said microcontroller that boosts; Said output delay circuit receives said defective insulation signal; And will the duration send to said inversion microcontroller above the earth leakage protective signal that produces behind the Preset Time, stop to exchange output and boost.
2. the leakage protection circuit of vehicle-mounted inverter according to claim 1 is characterized in that, said output delay circuit also links to each other with the said microcontroller that boosts, and said earth leakage protective signal is sent to the said microcontroller that boosts stop the DC/DC boosting inverter.
3. the leakage protection circuit of vehicle-mounted inverter according to claim 2 is characterized in that, the said microcontroller that boosts also is connected with failure alarm circuit, receives said earth leakage protective signal and exports failure alarm signal.
4. the leakage protection circuit of vehicle-mounted inverter according to claim 1 is characterized in that, said leakage protection circuit also comprises the input filter circuit that is connected between said insulation resistance testing circuit and the comparison circuit.
5. the leakage protection circuit of vehicle-mounted inverter according to claim 4 is characterized in that, said comparison circuit further comprises:
The peak value comparison circuit and the mean value comparison circuit of parallel connection; The input of said peak value comparison circuit and mean value comparison circuit links to each other with said input filter circuit output; Output inserts the output delay circuit, and the defective insulation signal that defective insulation signal that respectively peakedness ratio is produced and mean value relatively produce sends to said output delay circuit.
6. the leakage protection circuit of vehicle-mounted inverter according to claim 5; It is characterized in that; Said input filter circuit comprises the first amplifier U1A, capacitor C 4 and resistance R 24; The positive input of the said first amplifier U1A links to each other with the output of said insulation resistance testing circuit, and through capacitor C 4 ground connection; The signal output part of the said first amplifier U1A and positive input short circuit are formed voltage follower; The signal output part of the said first amplifier U1A is also through resistance R 24 ground connection and as the output of input filter circuit.
7. the leakage protection circuit of vehicle-mounted inverter according to claim 6 is characterized in that:
Said peak value comparison circuit comprises: the second amplifier U1B, resistance R 17, resistance R 10, resistance R 19, resistance R 20; The positive input of the said second amplifier U1B is connected to the output of said input filter circuit through resistance R 20; Said resistance R 10 and R19 are connected on and carry out dividing potential drop between operating voltage and the ground, and the node between said resistance R 10 and the R19 inserts the reverse input end of the second amplifier U1B; The signal output part of the said second amplifier U1B is through resistance R 17 ground connection, and access output delay circuit;
Said mean value comparison circuit comprises: the 3rd amplifier U1C, resistance R 18, resistance R 21, resistance R 22, resistance R 23 and capacitor C 3; The positive input of said the 3rd amplifier U1C is connected to the output of said input filter circuit through resistance R 23, and passes through capacitor C 3 ground connection; Said resistance R 21 and R22 are connected on and carry out dividing potential drop between operating voltage and the ground, and the node between said resistance R 21 and the R22 inserts the reverse input end of the 3rd amplifier U1C; The signal output part of said the 3rd amplifier U1C is through resistance R 18 ground connection, and access output delay circuit.
8. the leakage protection circuit of vehicle-mounted inverter according to claim 7 is characterized in that, said output delay circuit comprises capacitor C 2, four high guaily unit U1D, resistance R 12, resistance R 13, resistance R 14, resistance R 15 and resistance R 16;
Wherein, Said peakedness ratio connects capacitor C 2 than circuit output end through resistance R 15; Mean value comparison circuit output also connects the same end of capacitor C 2 through resistance R 16, capacitor C 2 other end ground connection, and insert the positive input of said four high guaily unit U1D; Said resistance R 13 and resistance R 14 are connected on carries out dividing potential drop between operating voltage and the ground, and the node between said resistance R 13 and the resistance R 14 inserts the reverse input end of four high guaily unit U1D; The signal output part of said four high guaily unit U1D is through resistance R 12 ground connection, and as the output of said output delay circuit.
9. a vehicle-mounted inverter comprises DC filtering circuit, DC/DC booster circuit, DC/AC inverter circuit and ac filter circuit, and boost microcontroller and the inversion microcontroller that is used to control the DC/AC inverter circuit that are used to control the DC/DC booster circuit; It is characterized in that said vehicle-mounted inverter also comprises the leakage protection circuit of any described vehicle-mounted inverter among the claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220026289 CN202586293U (en) | 2012-01-19 | 2012-01-19 | A leakage protection circuit of vehicle-mounted inverter and a corresponding vehicle-mounted inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220026289 CN202586293U (en) | 2012-01-19 | 2012-01-19 | A leakage protection circuit of vehicle-mounted inverter and a corresponding vehicle-mounted inverter |
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| CN202586293U true CN202586293U (en) | 2012-12-05 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199506A (en) * | 2013-04-12 | 2013-07-10 | 深圳市华星光电技术有限公司 | Over-current protection circuit and backlight module of light source drive module |
| CN103219707A (en) * | 2012-01-19 | 2013-07-24 | 美固电子(深圳)有限公司 | Leakage protection circuit of vehicle-mounted inverter and corresponding vehicle-mounted inverter |
| CN103499744A (en) * | 2013-10-12 | 2014-01-08 | 郑州日产汽车有限公司 | Electric automobile insulation resistance on-line monitoring method based on frequency response |
| JP2019009980A (en) * | 2017-06-23 | 2019-01-17 | Tdk株式会社 | Electrical leak detector, wireless transmission device, wireless power reception device and wireless power transmission system |
-
2012
- 2012-01-19 CN CN 201220026289 patent/CN202586293U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219707A (en) * | 2012-01-19 | 2013-07-24 | 美固电子(深圳)有限公司 | Leakage protection circuit of vehicle-mounted inverter and corresponding vehicle-mounted inverter |
| CN103219707B (en) * | 2012-01-19 | 2016-02-03 | 美固电子(深圳)有限公司 | A kind of leakage protection circuit of vehicle-mounted inverter and corresponding vehicle-mounted inverter |
| CN103199506A (en) * | 2013-04-12 | 2013-07-10 | 深圳市华星光电技术有限公司 | Over-current protection circuit and backlight module of light source drive module |
| CN103199506B (en) * | 2013-04-12 | 2015-07-15 | 深圳市华星光电技术有限公司 | Over-current protection circuit and backlight module of light source drive module |
| CN103499744A (en) * | 2013-10-12 | 2014-01-08 | 郑州日产汽车有限公司 | Electric automobile insulation resistance on-line monitoring method based on frequency response |
| JP2019009980A (en) * | 2017-06-23 | 2019-01-17 | Tdk株式会社 | Electrical leak detector, wireless transmission device, wireless power reception device and wireless power transmission system |
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Address after: 518111 No. 39 Fangkeng Road, Pinghu Community, Pinghu Street, Longgang District, Shenzhen City, Guangdong Province Patentee after: DOMEDA (Shenzhen) Electrical Appliances Co., Ltd. Address before: 518111 No. 39 Fangkeng Road, Pinghu Town, Longgang District, Shenzhen City, Guangdong Province Patentee before: Meigu Electronic (Shenzhen) Co., Ltd. |
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Granted publication date: 20121205 Termination date: 20200119 |
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| CF01 | Termination of patent right due to non-payment of annual fee |