CN209446725U - The insulating gate type field effect tube detection circuit of open loop push-pull converter - Google Patents
The insulating gate type field effect tube detection circuit of open loop push-pull converter Download PDFInfo
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- CN209446725U CN209446725U CN201822099062.9U CN201822099062U CN209446725U CN 209446725 U CN209446725 U CN 209446725U CN 201822099062 U CN201822099062 U CN 201822099062U CN 209446725 U CN209446725 U CN 209446725U
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- 230000005669 field effect Effects 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 26
- 239000004065 semiconductor Substances 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 11
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Abstract
The utility model provides a kind of insulating gate type field effect tube detection circuit of open loop push-pull converter, including changing branch pressure voltage detection signal group, the branch pressure voltage detection signal group that changes includes the diode and its divider resistance with the drain electrode connection of push-pull converter A winding metal-oxide-semiconductor, and the diode and divider resistance being connect with push-pull converter B winding metal-oxide-semiconductor gate pole, signal after changing voltage above is connect with comparator negative terminal, the anode of the comparator is connect with reference voltage circuit, and the output end of the comparator is connect with main control unit.The beneficial effects of the utility model are embodied in: compared to two current transformers occupancy PCB spaces are small, and high reliablity, detection speed is fast, and resistor voltage divider circuit can be used and further reduce the cost, the prime push-pull converter of the high-power inverter suitable for high reliability.
Description
Technical field
The utility model belongs to automobile technical field more particularly to a kind of insulated-gate type field effect of open loop push-pull converter
The overcurrent of pipe and the detection circuit of short circuit.
Background technique
Inverter prime is often used open loop push-pull converter, and operative duty cycles recommend transformation close to 50%, if to detect
Insulating gate type field effect tube (MOSFET) short circuit of device or over-current state, then A, the B two recommended is half of respectively to need an electric current mutual
Sensor is detected, and circuit is complicated, higher cost, and will also result in the inconvenience of PCB fabric swatch.The prior art is generally saved and is pushed away
The overcurrent and circuit detection of converter are drawn, only in the input side installation insurance silk of inverter, internal prime push-pull converter hair
Fuse wire when raw failure.But the fusing speed of fuse is slower, fusing time and the size of overcurrent are closely related,
Generally at least all more than several hundred milliseconds.Therefore, inverter product higher for reliability requirement is required to quickly detect
The method of push-pull converter MOSFET short circuit or overcurrent.
Utility model content
In order to solve the deficiencies in the prior art, the utility model provides a kind of insulated-gate type field of open loop push-pull converter
The overcurrent of effect pipe and the detection circuit of short circuit.
The purpose of this utility model is achieved through the following technical solutions:
The insulating gate type field effect tube detection circuit of open loop push-pull converter, including change branch pressure voltage detection signal group, institute
State change branch pressure voltage detection signal group include with push-pull converter A winding metal-oxide-semiconductor drain electrode connection diode and its divider resistance,
And the diode and divider resistance being connect with push-pull converter B winding metal-oxide-semiconductor gate pole, the signal after changing voltage above is compared with
The connection of device negative terminal, the anode of the comparator are connect with reference voltage circuit, and the output end and main control unit of the comparator connect
It connects.
Preferably, the branch pressure voltage detection signal group that changes is provided with two groups, and respectively first changes branch pressure voltage detection letter
Number group changes branch pressure voltage detection signal group with second, and the amplifier is provided with the first amplifier and the second amplifier, and described the
The voltage signal for changing branch pressure voltage detection signal group enters the negative input end of the first amplifier after capacitor filtering, and described the
The voltage signal of two number of converting to groups enters the negative input end of the second amplifier after capacitor filtering.
Preferably, described first change branch pressure voltage detection signal group include and push-pull converter A winding metal-oxide-semiconductor drain electrode connect
The tenth diode and the 28th resistance with the tenth Diode series, connect with push-pull converter B winding metal-oxide-semiconductor gate pole
The 9th diode connect and the 25th resistance with the 9th Diode series.
Preferably, described second change branch pressure voltage detection signal group include and push-pull converter B winding metal-oxide-semiconductor drain electrode connect
The 13rd diode and the 31st resistance with the 13rd Diode series, with push-pull converter B winding metal-oxide-semiconductor door
The 12nd diode that pole connects and the 29th resistance with the 12nd Diode series.
Preferably, the negative input end of first amplifier is connected with the 15th capacitor, and bearing for second amplifier is defeated
Enter end and is connected with the 17th capacitor.
Preferably, the reference voltage is 2.5V.
The beneficial effects of the utility model are embodied in: compared to two current transformers occupancy PCB spaces are small, high reliablity,
It is fast to detect speed, resistor voltage divider circuit can be used and further reduce the cost, the high-power inverter suitable for high reliability
Prime push-pull converter.
Detailed description of the invention
Fig. 1: the utility model circuit connection diagram.
Fig. 2: the utility model reference voltage circuit figure.
Specific embodiment
With reference to embodiments and attached drawing is specifically described the technical solution of the utility model, and the utility model discloses one kind
The insulating gate type field effect tube detection circuit of open loop push-pull converter in conjunction with shown in Fig. 1-Fig. 2, including changes branch pressure voltage detection letter
Number group, it is described change branch pressure voltage detection signal group include with the diode of push-pull converter A winding metal-oxide-semiconductor drain electrode connection and its point
Piezoresistance, and the diode and divider resistance that are connect with push-pull converter B winding metal-oxide-semiconductor gate pole, the letter after changing voltage above
Number connect with comparator negative terminal, the anode and reference voltage of the comparator are the circuit connection of 2.5V, the comparator it is defeated
Outlet is connect with main control unit.The reference voltage circuit includes the 36th resistance connecting with power end, through the third
The reference voltage for the 2.5V that 16 resistance are formed enters the positive input terminal of amplifier.
In the present embodiment, the branch pressure voltage detection signal group that changes is provided with two groups, and respectively first changes branch pressure voltage inspection
It surveys signal group and changes branch pressure voltage detection signal group with second.The amplifier is provided with the first amplifier U2A and the second amplifier
U2B, the described first voltage signal for changing branch pressure voltage detection signal group enter the negative of the first amplifier U2A after capacitor filtering
Input terminal, the voltage signal of the No. of converting to second group enter the negative input end of the second amplifier U2B after capacitor filtering.Institute
The negative input end for stating the first amplifier U2A is connected with the 15th C15 capacitor, the negative input end connection of the second amplifier U2B
There is the 17th capacitor C17.
Specifically, described first change branch pressure voltage detection signal group include and push-pull converter A winding metal-oxide-semiconductor drain electrode connect
The tenth diode D10 and with the concatenated 28th resistance R28 of the tenth diode D10, with push-pull converter B winding
Metal-oxide-semiconductor gate pole connection the 9th diode D9 and with the concatenated 25th resistance R25 of the 9th diode D9.Described second
Change branch pressure voltage detection signal group include with push-pull converter B winding metal-oxide-semiconductor drain electrode connection the 13rd diode D13 and with institute
The 31st resistance R31 for stating the 13rd Diode series, the 12nd connect with push-pull converter B winding metal-oxide-semiconductor gate pole
Pole pipe D12 and with the concatenated 29th resistance R29 of the 12nd diode D12.
The control process of lower the utility model circuit described briefly below.
Signal Push_Pull_A comes from the drain electrode of push-pull converter A winding insulation grid-type field-effect tube (MOSFET), signal
Gate pole of the Push_Pull_A_G from push-pull converter A winding MOSFET, Schottky diode D9, D10 and connected in series
Divider resistance R25, R28 detects the DS voltage under the conducting of A winding MOSFET, which enters after C15 is filtered
The negative input end of U2A voltage comparator.
Drain electrode of the signal Push_Pull_B from push-pull converter B winding MOSFET, signal Push_Pull_B_G come from
The gate pole of push-pull converter A winding MOSFET, Schottky diode D12, D13 and divider resistance R29, R31 connected in series
The DS voltage under the conducting of A winding MOSFET is detected, the voltage signal is defeated into bearing for U2B voltage comparator after C17 is filtered
Enter end
The reference voltage that wherein U1 circuit constitutes stable 2.5V forms circuit, and 2.5V reference voltage is entering comparator just
Input terminal, when DS voltage signal is more than 2.5V, stronger output signal LATCH_OFF is reversed to low level, LATCH_ therewith
OFF signal is connected to the main control unit or other control circuits of inverter, for the overcurrent or short-circuit condition of MOSFET, executes phase
The safeguard measure answered.
Still there are many specific embodiments for certain the utility model, are just not listed one by one herein.It is all to use equivalent replacement
Or equivalent transformation and all technical solutions for being formed, within the scope of all falling within the requires of the utility model protection.
Claims (6)
1. the insulating gate type field effect tube detection circuit of open loop push-pull converter, it is characterised in that: including changing branch pressure voltage detection
Signal group, it is described change branch pressure voltage detection signal group include with push-pull converter A winding metal-oxide-semiconductor drain electrode connection diode and its
Divider resistance, and the diode and divider resistance that are connect with push-pull converter B winding metal-oxide-semiconductor gate pole, after changing voltage above
Signal is connect with comparator negative terminal, and the anode of the comparator is connect with reference voltage circuit, the output end of the comparator with
Main control unit connection, the reference voltage circuit includes the 36th resistance connecting with power end, through the 36th electricity
The reference voltage for hindering the 2.5V formed enters the positive input terminal of amplifier.
2. the insulating gate type field effect tube detection circuit of open loop push-pull converter as described in claim 1, it is characterised in that: institute
State change branch pressure voltage detection signal group be provided with two groups, respectively first change branch pressure voltage detection signal group with second changes partial pressure electricity
Pressure detection signal group, the amplifier are provided with the first amplifier and the second amplifier, and described first changes branch pressure voltage detection letter
The voltage signal of number group enters the negative input end of the first amplifier, the voltage letter of the No. of converting to second group after capacitor filtering
The negative input end of the second amplifier number is entered after capacitor filtering.
3. the insulating gate type field effect tube detection circuit of open loop push-pull converter as claimed in claim 2, it is characterised in that: institute
State first change branch pressure voltage detection signal group include with push-pull converter A winding metal-oxide-semiconductor drain electrode connection the tenth diode and with
28th resistance of the tenth Diode series, the 9th diode being connect with push-pull converter B winding metal-oxide-semiconductor gate pole and
With the 25th resistance of the 9th Diode series.
4. the insulating gate type field effect tube detection circuit of open loop push-pull converter as claimed in claim 2, it is characterised in that: institute
State second change branch pressure voltage detection signal group include with push-pull converter B winding metal-oxide-semiconductor drain electrode connection the 13rd diode and
With the 31st resistance of the 13rd Diode series, the 12nd connect with push-pull converter B winding metal-oxide-semiconductor gate pole
Pole pipe and the 29th resistance with the 12nd Diode series.
5. the insulating gate type field effect tube detection circuit of open loop push-pull converter as claimed in claim 2, it is characterised in that: institute
The negative input end for stating the first amplifier is connected with the 15th capacitor, and the negative input end of second amplifier is connected with the 17th electricity
Hold.
6. the insulating gate type field effect tube detection circuit of open loop push-pull converter as described in claim 1, it is characterised in that: institute
Stating reference voltage is 2.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822099062.9U CN209446725U (en) | 2018-12-14 | 2018-12-14 | The insulating gate type field effect tube detection circuit of open loop push-pull converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822099062.9U CN209446725U (en) | 2018-12-14 | 2018-12-14 | The insulating gate type field effect tube detection circuit of open loop push-pull converter |
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| Publication Number | Publication Date |
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| CN209446725U true CN209446725U (en) | 2019-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822099062.9U Active CN209446725U (en) | 2018-12-14 | 2018-12-14 | The insulating gate type field effect tube detection circuit of open loop push-pull converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444707A (en) * | 2018-12-14 | 2019-03-08 | 凯斯库汽车部件（苏州）有限公司 | The insulating gate type field effect tube detection circuit of open loop push-pull converter |
-
2018
- 2018-12-14 CN CN201822099062.9U patent/CN209446725U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444707A (en) * | 2018-12-14 | 2019-03-08 | 凯斯库汽车部件（苏州）有限公司 | The insulating gate type field effect tube detection circuit of open loop push-pull converter |
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