CN210297257U - PTC heating device with reverse connection protection - Google Patents
PTC heating device with reverse connection protection Download PDFInfo
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- CN210297257U CN210297257U CN201921212077.XU CN201921212077U CN210297257U CN 210297257 U CN210297257 U CN 210297257U CN 201921212077 U CN201921212077 U CN 201921212077U CN 210297257 U CN210297257 U CN 210297257U
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Abstract
The utility model discloses a take PTC heating device of reverse connection protection, including preventing reverse connection unit, PTC heating plate, IGBT switching device, IGBT drive circuit and controller, prevent that reverse connection unit, PTC heating plate, IGBT switching device establish ties and form the main circuit, the both ends of main circuit with external DC power supply are connected, prevent reverse connection unit's the direction of conduction and the IGBT switching device's body diode's the opposite direction of conduction; the controller controls the on and off of the IGBT switching device through the IGBT driving circuit. The utility model discloses a take PTC heating device of transposition protection prevents reverse unit through adopting diode etc. to restriction PTC heating device's current flow direction, when the high pressure transposition, the high pressure can not form the electric current return circuit through body diode and the PTC heating plate of IGBT switch, and the PTC heating plate can not heated safe and reliable.
Description
Technical Field
The utility model relates to a PTC heating device field especially relates to a take PTC heating device of transposition protection.
Background
The existing PTC heating device for the new energy vehicle generally adopts an IGBT (insulated gate bipolar transistor) as a power switching device of the PTC heating device. The IGBT is a power crystal, and the crystal is used as a switching circuit of the PTC heating device, so that the product efficiency can be effectively improved, and the PTC heating device has the advantages of small line loss, high heating efficiency, long product service life and the like.
The electric circuit of the PTC heating device of the existing new energy vehicle has no high-voltage reverse connection prevention protection function, when the power supply of the PTC heating device is reversely connected, the reverse connection power supply can form a current loop from the cathode of the PTC heating device to the body diode of the IGBT, then to the PTC heating sheet and finally to the anode of the PTC heating device, so that the PTC heating device is not controlled to be always in a heating state, certain potential safety hazards exist, meanwhile, the battery power consumption can be too fast, and the IGBT damage, namely the PTC damage, can be caused for a long time.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to provide a PTC heating device with reverse connection protection to overcome the problem of leakage current when the power supply is reversely connected in the PTC heating device based on the control of the IGBT switching device.
In order to achieve the purpose, the utility model provides a take PTC heating device of reverse connection protection, including preventing reverse connection unit, PTC heating plate, IGBT switching device, IGBT drive circuit and controller, prevent that reverse connection unit, PTC heating plate, IGBT switching device establish ties and form the main circuit, the both ends of main circuit and external DC power supply are connected, prevent that reverse connection unit's the direction of conduction is opposite with the direction of conduction of IGBT switching device's body diode; the controller controls the on and off of the IGBT switching device through the IGBT driving circuit.
Further, the reverse connection preventing unit is a diode, and the conducting direction of the diode is opposite to the conducting direction of the body diode of the IGBT switching device.
In order to achieve the above object, the utility model also provides a PTC heating device of protection is connected in reverse, including high-pressure part and low-voltage part, the high-pressure part includes high-voltage connector, prevents that the grafting unit, PTC heating plate and IGBT switching device are prevented to the grafting, high-voltage connector is used for connecting the high-pressure power battery of car and supplies power for the PTC heating plate, prevent that grafting unit, IGBT switching device establish ties and constitute the main circuit and be connected to the positive pole of the power and the power negative pole on the high-voltage connector; the low-voltage part comprises a controller, an isolation DC/DC circuit and an isolation IGBT driving circuit, wherein the isolation DC/DC circuit supplies power to the driving end of the isolation IGBT driving circuit, and the controller drives the isolation IGBT driving circuit to control the on or off of an IGBT switching device.
Furthermore, the reverse connection prevention unit comprises an input end and an output end, the input end of the reverse connection prevention unit is electrically connected with the positive electrode of the power supply of the high-voltage connector, the output end of the reverse connection prevention unit is electrically connected with the first electrode of the PTC heating sheet, the second electrode of the PTC heating sheet is electrically connected with the collector electrode of the IGBT switching device, and the emitter electrode of the IGBT switching device is electrically connected with the negative electrode of the power supply of the high-voltage connector.
Further, the reverse connection preventing unit is a diode, the anode of the diode is the input end of the reverse connection preventing unit, and the cathode of the diode is the output end of the reverse connection preventing unit.
Further, the reverse connection preventing unit further comprises a control end, the control end is electrically connected with the controller, the controller detects whether the connection state of the high-voltage connector is normal or not, and controls the connection or disconnection of the input end and the output end of the reverse connection preventing unit through the control end.
Furthermore, the reverse connection preventing unit is a relay, the relay comprises a control end, a common end and a normally open end, the control end of the relay is the control end of the reverse connection preventing unit, and the common end and the normally open end of the relay are respectively the input end and the output end of the reverse connection preventing unit.
Further, the isolation IGBT driving circuit comprises a chip NCD57001 and peripheral circuits thereof.
Further, the PTC heating device further comprises an isolation voltage acquisition circuit, wherein the isolation voltage acquisition circuit comprises a voltage detection circuit and an isolation amplification circuit, the voltage detection circuit is bridged on the positive electrode and the negative electrode of the power supply of the high-voltage connector, the output of the voltage detection circuit is connected with the input of the isolation amplification circuit, and the output of the isolation amplification circuit is connected to the input end of the controller.
Further, the PTC heating device further comprises an isolation current acquisition circuit, wherein a current detection sensor of the isolation current acquisition circuit is connected in series between a power supply cathode of the high-voltage connector and the IGBT switching device, and an output of the isolation current acquisition circuit is connected to an input end of the controller.
Further, the isolation current collection circuit comprises a device ACS724 and peripheral circuits thereof, and the device ACS724 integrates the circuit detection sensor.
Furthermore, the low-voltage part also comprises a CAN bus interface circuit, and the controller is communicated with the vehicle-mounted ECU through a CAN bus.
Furthermore, the temperature control device also comprises a water channel and temperature sensors, wherein the water channel is used for absorbing and controlling the temperature of the PTC heating plates, the temperature sensors are respectively arranged in the water channel in front of and behind the PTC heating plates along the water flow direction of the water channel, and the temperature sensors are connected to the input end of the controller.
The utility model discloses a take PTC heating device of transposition protection prevents reverse unit through adopting diode etc. to restriction PTC heating device's current flow direction, when the high pressure transposition, the high pressure can not form the electric current return circuit through body diode and the PTC heating plate of IGBT switch, and the PTC heating plate can not heated safe and reliable.
Drawings
FIG. 1 is an electrical schematic block diagram of a preferred embodiment of the present invention;
FIG. 2 is the isolated IGBT drive circuit of FIG. 1;
FIG. 3 is the isolated voltage acquisition circuit of FIG. 1;
FIG. 4 is the isolated current acquisition circuit of FIG. 1;
FIG. 5 is the temperature sensing circuit of FIG. 1;
FIG. 6 is the controller circuit of FIG. 1;
fig. 7 is a relay anti-reverse connection circuit of another embodiment.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
Example one
As shown in fig. 1, the present invention discloses a circuit diagram of a specific embodiment of a PTC heating device with reverse connection protection, which comprises a high voltage part and a low voltage part, the high-voltage part comprises a high-voltage connector 101, an anti-reverse connection unit 102, a PTC heating sheet 103 and an IGBT switching device 104, wherein the high-voltage connector 101 is used for connecting a high-voltage power battery of an automobile to supply power to the PTC heating sheet 103, the anti-reverse connection unit 102 and the IGBT switching device 104 are connected in series to form a main circuit which is electrically connected to a power supply positive electrode and a power supply negative electrode on the high-voltage connector 101, specifically, a first electrode of the anti-reverse connection unit 102 is electrically connected with the power supply positive electrode of the high-voltage connector 101, a second electrode of the anti-reverse connection unit is electrically connected with a first electrode of the PTC heating sheet, a second electrode of the PTC heating sheet 103 is electrically connected with a collector electrode of the IGBT switching device 104, and an emitter electrode of the; the high-voltage part also comprises auxiliary detection circuits such as a voltage detection circuit 106, a current detection sensor 105 and the like, wherein the voltage detection circuit is bridged on the positive electrode and the negative electrode of the power supply on the high-voltage connector 101, and the specific circuit is shown in fig. 3; a current detection sensor 105 is connected in series between the negative electrode of the power supply of the high-voltage connector 101 and the IGBT switching device 104, and a specific current detection circuit is shown in fig. 4.
The low-voltage part comprises a low-voltage connector 201, a DC/DC circuit 202, a CAN bus interface circuit 203 and a controller 204, the low-voltage connector 201 provides a low-voltage battery interface and a CAN bus interface, and the DC/DC circuit 202 is used for supplying power to devices of the low-voltage part such as the controller 204. The high-voltage part and the low-voltage part are electrically connected through an isolation circuit, and the isolation circuit comprises an isolation DC/DC circuit 301, an isolation voltage acquisition circuit 302, an isolation current acquisition circuit 303 and an isolation IGBT driving circuit 304. The controller 204 at the low-voltage part acquires the voltage and current of the main circuit through an isolation voltage acquisition circuit 302, an isolation current acquisition circuit 303 and an isolation IGBT drive circuit 304 and drives the IGBT switch device 104 to act; meanwhile, an isolation DC/DC power supply circuit 301 is adopted to supply power to an isolation voltage acquisition circuit 302, an isolation current acquisition circuit 303 and an isolation IGBT drive circuit 304, and the power supply input of the isolation DC/DC power supply circuit 301 is connected with a low-voltage battery; through above measure, prove that low voltage battery and high voltage power battery are kept apart completely, maintain safer when the low pressure part breaks down, can not have the risk of electrocution.
Fig. 2 shows a main circuit and an isolated IGBT drive circuit, U1 is a core control chip of the isolated IGBT drive circuit 204, and the model is NCD57001, where the control terminal voltage is +5V, the drive terminal voltage is +15V _ H, the plug terminal J1 is the high voltage connector 101, the diode D10 is the reverse connection prevention unit 102, the PT2 is the PTC heating plate 103, and the Q2 is the IGBT switching device 104; the anode of the diode D10 is the first electrode of the reverse connection preventing unit and is electrically connected with the plug terminal J1 of the power supply positive electrode of the high voltage connector 101, and the cathode of the diode is the second electrode of the reverse connection preventing unit and is connected with the first electrode of the PTC heating plate 103.
Fig. 3 shows an isolation voltage acquisition circuit, U4 is a core chip of the isolation voltage acquisition circuit 302, U4 is an isolation discharger, which is supplied with power by +5V _ H and +5V at an input end and an output end, respectively, a power supply (HV +, HGND) of the high-voltage connector 101 is input to VINP of U4 through a voltage detection circuit 106 (which is a resistor voltage division network), VINN of U4 is input to HGND through a resistor R35, and the output end of U4, VOUTP and VOUTN output differential signals V _ HV and V _ HV1, respectively, and send the differential signals to the controller 204.
FIG. 4 shows an isolated current collection circuit, wherein U8 is the core chip of the isolated current collection circuit 303, whose model is ACS724LLCTR-50AB-T, U8 is the isolation circuit sensing IC of the vehicle gauge, and the current detection sensor 105 is integrated between the pins IP + and IP-of U8. Pins IP + and IP-are connected to HGND and a jack terminal J3, respectively, wherein jack terminal J3 is the negative power supply terminal of high voltage connector 101.
Fig. 5 shows a temperature detection circuit, as shown in fig. 2 and 5, in this embodiment, the PTC heating device is further provided with a water channel 401, heat generated by the PTC heating sheet 103 is conducted out by circulating water in the water channel to control the heating temperature of the PTC heating sheet 103, and the circulating water can also conduct heat generated by the PTC heating sheet 103 to a device requiring heat preservation or heating; for this purpose, a temperature sensor 402, 403 is respectively arranged in the water channel before and after the PTC heating plate 103 along the water flow direction of the water channel, the output of the two temperature sensors is connected to the controller 204, the controller 204 collects the water temperature of the circulating water before and after heating, and adjusts the heating power of the PTC heating plate 103 according to the two temperatures, or adjusts the flow rate of the circulating water, so as to control the water temperature of the circulating water. RT2 and RT3 in fig. 5 correspond to temperature sensor 402 and temperature sensor 403, respectively.
Preferably, temperature sensors are also arranged in temperature sensitive areas of the IGBT switching device 104, the high-voltage connector 101 and the like, and are used for monitoring whether the temperature of devices or components of the IGBT switching device 104, the high-voltage connector 101 and the like is abnormal or not.
FIG. 6 is an interface diagram of the controller 204, in which the chip U10 is the controller 204, and the chip U10 is model STM8AF5289, which is an 8-bit single chip microcomputer.
In this embodiment, the input voltage of the low-voltage part is 12V, which respectively supplies power to the DC/DC circuit 202, the CAN bus interface circuit 203 and the isolated DC/DC circuit 301, wherein the output of the DC/DC circuit 202 is +5V, and +5V is the operating voltage of the low-voltage part; the isolated DC/DC circuit 301 outputs +15 vh and +5 vh for the switching and isolated current acquisition circuits of the IBGT switching devices respectively,
other cell circuits are conventional in the art and are not disclosed further herein.
Example two
As shown IN fig. 7, the reverse connection preventing unit 102 may be a Relay, the Relay K1 includes an electromagnet and a controlled switch, a common terminal of the switch is connected to HV + IN fig. 1, a normally open terminal of the switch is connected to HV + IN fig. 1, the controller 204 outputs a signal Relay _ ON/OFF, and controls the attraction and release of the electromagnet of the Relay K1 through a chip U11 and a transistor Q1, so as to achieve the connection or disconnection of the common terminal and the normally open terminal of the switch, wherein the chip U11 is ISO7321 and is a dual-channel digital isolator. When the controller 204 is powered ON, whether the connection between the high-voltage connector 101 and the power supply is correct or not is detected, when the connection between the high-voltage connector 101 is correct, the controller 204 outputs a conducting signal, the signal Relay _ ON/OFF is high level, and the Relay K1 is conducted; when the high-voltage connector 101 is reversely connected, the controller 204 outputs a turn-OFF signal, the signal Relay _ ON/OFF is low level, and the Relay K1 is turned OFF.
The control and protection circuit of the PTC heating device with the reverse connection protection of the utility model can identify the forward and reverse voltage and current of the high-voltage end, when the high voltage is in reverse connection, the high voltage can not form a current loop through the PTC heating sheet, and the PTC can not be heated; and the controller CAN tell the vehicle ECU (electronic control unit) that high-voltage reverse connection fault occurs at this moment through the CAN bus, rather than finding out PTC fault simply, CAN more accurate location trouble, then tell car personnel in time to overhaul and get rid of the fault through the panel board, safer and more reliable.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a take PTC heating device of transposition protection which characterized in that: the anti-reverse-connection type direct current power supply comprises an anti-reverse-connection unit, a PTC heating sheet, an IGBT switching device, an IGBT driving circuit and a controller, wherein the anti-reverse-connection unit, the PTC heating sheet and the IGBT switching device are connected in series to form a main circuit, two ends of the main circuit are connected with an external direct current power supply, and the conduction direction of the anti-reverse-connection unit is opposite to the conduction direction of a body diode of the IGBT switching device; the controller controls the on and off of the IGBT switching device through the IGBT driving circuit.
2. A PTC heating device according to claim 1, wherein: the reverse connection preventing unit is a diode, and the conducting direction of the diode is opposite to the conducting direction of a body diode of the IGBT switching device.
3. The utility model provides a take PTC heating device of transposition protection which characterized in that: the high-voltage part comprises a high-voltage connector, an anti-reverse connection unit, a PTC heating sheet and an IGBT switching device, wherein the high-voltage connector is used for connecting a high-voltage power battery of an automobile to supply power to the PTC heating sheet, and the PTC heating sheet, the anti-reverse connection unit and the IGBT switching device are connected in series to form a main circuit which is electrically connected to a power supply positive electrode and a power supply negative electrode on the high-voltage connector; the low-voltage part comprises a controller, an isolation DC/DC circuit and an isolation IGBT driving circuit, wherein the isolation DC/DC circuit supplies power to the driving end of the isolation IGBT driving circuit, and the controller drives the isolation IGBT driving circuit to control the on or off of an IGBT switching device.
4. A PTC heating device according to claim 3, wherein: the anti-reverse connection unit comprises an input end and an output end, the input end of the anti-reverse connection unit is electrically connected with the positive electrode of the power supply of the high-voltage connector, the output end of the anti-reverse connection unit is electrically connected with the first electrode of the PTC heating sheet, the second electrode of the PTC heating sheet is electrically connected with the collector electrode of the IGBT switching device, and the emitter electrode of the IGBT switching device is electrically connected with the negative electrode of the power supply of the high-voltage connector.
5. A PTC heating device according to claim 4, wherein: the reverse connection preventing unit is a diode, the anode of the diode is the input end of the reverse connection preventing unit, and the cathode of the diode is the output end of the reverse connection preventing unit.
6. A PTC heating device according to claim 4, wherein: the reverse connection preventing unit further comprises a control end, the control end is electrically connected with the controller, the controller detects whether the connection state of the high-voltage connector is normal or not, and controls the connection or disconnection of the input end and the output end of the reverse connection preventing unit through the control end.
7. A PTC heating device according to claim 6, wherein: the reverse connection preventing unit is a relay, the relay comprises a control end, a public end and a normally open end, the control end of the relay is the control end of the reverse connection preventing unit, and the public end and the normally open end of the relay are respectively the input end and the output end of the reverse connection preventing unit.
8. A PTC heating device according to claim 3, wherein: the isolation voltage acquisition circuit comprises a voltage detection circuit and an isolation amplification circuit, the voltage detection circuit is bridged on the positive electrode and the negative electrode of the power supply of the high-voltage connector, the output of the voltage detection circuit is connected with the input of the isolation amplification circuit, and the output of the isolation amplification circuit is connected to the input end of the controller.
9. A PTC heating device according to claim 3, wherein: the current detection sensor of the isolation current acquisition circuit is connected in series between the negative electrode of the power supply of the high-voltage connector and the IGBT switching device, and the output of the isolation current acquisition circuit is connected to the input end of the controller.
10. A PTC heating device according to claim 3, wherein: the temperature control device is characterized by further comprising a water channel and temperature sensors, wherein the water channel is used for absorbing and controlling the temperature of the PTC heating plates, the temperature sensors are respectively arranged in the water channel in front of and behind the PTC heating plates along the water flow direction of the water channel, and the temperature sensors are connected to the input end of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921212077.XU CN210297257U (en) | 2019-07-30 | 2019-07-30 | PTC heating device with reverse connection protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921212077.XU CN210297257U (en) | 2019-07-30 | 2019-07-30 | PTC heating device with reverse connection protection |
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| CN210297257U true CN210297257U (en) | 2020-04-10 |
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| CN201921212077.XU Active CN210297257U (en) | 2019-07-30 | 2019-07-30 | PTC heating device with reverse connection protection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345866A (en) * | 2020-11-11 | 2021-02-09 | 上海子誉电子陶瓷有限公司 | Dry burning test device for single-side conductive PTC heating plate |
| CN116074995A (en) * | 2023-03-07 | 2023-05-05 | 深圳艾为电气技术有限公司 | Heating circuit of PTC heater and heating control method thereof |
-
2019
- 2019-07-30 CN CN201921212077.XU patent/CN210297257U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345866A (en) * | 2020-11-11 | 2021-02-09 | 上海子誉电子陶瓷有限公司 | Dry burning test device for single-side conductive PTC heating plate |
| CN116074995A (en) * | 2023-03-07 | 2023-05-05 | 深圳艾为电气技术有限公司 | Heating circuit of PTC heater and heating control method thereof |
| CN116074995B (en) * | 2023-03-07 | 2023-07-21 | 深圳艾为电气技术有限公司 | Heating circuit of PTC heater and heating control method thereof |
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