CN218386785U - Over-temperature protection circuit of wireless power transmission system - Google Patents
Over-temperature protection circuit of wireless power transmission system Download PDFInfo
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- CN218386785U CN218386785U CN202222742119.9U CN202222742119U CN218386785U CN 218386785 U CN218386785 U CN 218386785U CN 202222742119 U CN202222742119 U CN 202222742119U CN 218386785 U CN218386785 U CN 218386785U
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Abstract
The utility model provides an over-temperature protection circuit of a wireless electric energy transmission system, which comprises a temperature acquisition circuit; the user interface is used for displaying and inputting a limiting value of the temperature; the single chip microcomputer is connected with the temperature acquisition circuit and is connected with a user interface through a data transmission module; the single chip microcomputer is used for judging whether the temperature acquired by the temperature acquisition circuit exceeds an input limit value or not; the over-temperature protection circuit is used for controlling the IGBT of the receiving end to be turned off when the temperature acquired by the temperature acquisition circuit exceeds an input limit value; and the alarm circuit is used for reminding through a buzzer when the temperature acquired by the temperature acquisition circuit exceeds an input limit value. The utility model discloses a temperature acquisition circuit can gather the temperature of receiving terminal magnetic core in real time to carry out overtemperature protection and warning when exceeding the limit value to the temperature of gathering and remind, make wireless power transmission system normal operating, avoid the occurence of failure.
Description
Technical Field
The utility model relates to a wireless power transmission technical field specifically is a wireless power transmission system excess temperature protection circuit.
Background
In recent years, the wireless power transmission technology is rapidly developed and is more and more widely applied in the fields of consumer electronics, medical appliances, robots, electric automobiles and the like; in some mobile power utilization occasions, the power supply wires of the traditional wired power transmission are easy to generate electric leakage, short circuit and open circuit due to physical changes such as pulling deformation, mechanical damage and the like, so that the normal operation of power utilization equipment is influenced, and even the personal safety is damaged, therefore, the wireless power transmission technology is widely researched by virtue of the advantages of high safety, intelligence, convenience, flexibility, reliability and the like.
The wireless electric energy transmission system mainly comprises a voltage type full-bridge high-frequency inverter circuit, an LCC-S compensation circuit, a high-frequency rectification circuit and a voltage-reducing chopper circuit, wherein a receiving end adopts passive heat dissipation for meeting the requirements of automation equipment, in the working process, a receiving end coil generates large voltage and large current, a magnetic core also generates large heat in the working process, an IGBT (insulated gate bipolar translator) module in the voltage-reducing chopper circuit is continuously opened and closed to generate a large amount of heat, the machine can be damaged if the large amount of heat is not timely treated, fire disasters can appear in serious conditions, and potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims at providing a wireless power transmission system excess temperature protection circuit can solve current magnetic core and also produce a large amount of heat at the course of the work, and the IGBT module among the step-down chopper circuit constantly opens and shuts off and also can produce heat in a large number, and a large amount of heat productions can cause the damage of machine if not in time the processing, can appear the conflagration when serious, this problem that just has the potential safety hazard.
In order to achieve the purpose, the utility model discloses a technical scheme as follows:
the utility model discloses a realize through following technical scheme: an over-temperature protection circuit of wireless power transmission system comprises
The temperature acquisition circuit is used for acquiring the temperature of the magnetic core and the temperature of the IGBT at the receiving end;
a user interface for displaying and inputting a limit value of a temperature;
the single chip microcomputer is connected with the temperature acquisition circuit and is connected with a user interface through a data transmission module; the single chip microcomputer is used for judging whether the temperature acquired by the temperature acquisition circuit exceeds an input limit value or not;
the over-temperature protection circuit is used for controlling the IGBT of the receiving end to be turned off when the temperature acquired by the temperature acquisition circuit exceeds an input limit value;
and the alarm circuit is used for reminding through a buzzer when the temperature acquired by the temperature acquisition circuit exceeds an input limit value.
Further, the temperature acquisition circuit comprises a thermistor attached to the magnetic core and the receiving end IGBT, and the thermistor is connected in parallel with the twenty-ninth diode and then connected in series with the operational amplifier; the operational amplifier is connected with the sixty-first current limiting resistor in series and then is connected with the single chip microcomputer.
Furthermore, the over-temperature protection circuit is connected with the single chip microcomputer and comprises a first temperature switch, and the first temperature switch is connected with a forty-second resistor and a diode in parallel and then connected with the forty-second resistor in series.
Furthermore, the alarm circuit is connected with the singlechip, and comprises a triode which is connected with the first capacitor in parallel and then connected with the second resistor in parallel, and is connected with the first resistor in series after being connected in parallel; the triode is connected with the loudspeaker in series, the loudspeaker is connected with the first diode in parallel after being connected with the third capacitor in parallel, and the loudspeaker is connected with the second capacitor in series after being connected with the third capacitor in parallel.
The current acquisition circuit is used for acquiring the current on the pickup coil; the current acquisition circuit is connected with the singlechip.
Further, the current acquisition circuit comprises a current transformer, and the current transformer is connected with a diode rectifier bridge; the diode rectifier bridge is connected with a thirteenth resistor in parallel, and the thirteenth resistor is connected with a thirtieth diode in parallel; and the sixty-second resistor is connected with the twenty-fourth capacitor and the twenty-fifth capacitor in parallel and then connected with the singlechip.
Compared with the prior art, the beneficial effects of the utility model include:
the utility model discloses a temperature of receiving terminal magnetic core can be gathered in real time to the temperature of gathering to carrying out overtemperature protection and warning when exceeding the limit value to the temperature of gathering and reminding, making wireless power transmission system normal operating, stopping the operation of relevant equipment and sending out the police dispatch newspaper when the temperature exceeds the limit value, avoid the occurence of failure, holistic security when improving wireless power transmission system and using.
Drawings
The disclosure of the present invention is explained with reference to the drawings. It should be understood that the drawings are for illustration purposes only and are not intended to limit the scope of the present disclosure, wherein like reference numerals are used to refer to like elements throughout. Wherein:
fig. 1 is a schematic diagram of an overall structure of an over-temperature protection circuit of a wireless power transmission system according to the present invention;
fig. 2 is a schematic circuit diagram of a temperature acquisition circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an over-temperature protection circuit according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an alarm circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of the current collecting circuit according to an embodiment of the present invention.
Detailed Description
It is easily understood that, according to the technical solution of the present invention, a plurality of alternative structural modes and implementation modes can be proposed by those skilled in the art without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.
An over-temperature protection circuit of a wireless power transmission system is disclosed, which is exemplarily an LCC-S type wireless power transmission system over-temperature protection circuit;
as shown in fig. 1, the temperature acquisition circuit is included, and is used for acquiring the temperature of the magnetic core and the IGBT at the receiving end; the circuit diagram of the temperature acquisition circuit is shown in fig. 2, and comprises a thermistor (RT 1), wherein the thermistor (RT 1) is attached to the surfaces of a magnetic core and a receiving end IGBT and fixed, and the thermistor (RT 1) is connected with a twenty-ninth diode (D29) in parallel and then connected with an operational amplifier in series; the operational amplifier is connected with a sixty-one current limiting resistor (R61) in series and then is connected with the singlechip; the temperature acquisition detection is realized by changing the voltage at two ends of the thermistor (RT 1) through the resistance value change of the thermistor (RT 1), for example, the temperature of a magnetic core is detected, when the temperature of the magnetic core rises, the resistance value of the thermistor (RT 1) changes correspondingly, the voltage on the thermistor (RT 1) changes correspondingly, the voltage is output through an operational amplifier and then is connected to the AD conversion input end of the singlechip through a sixteenth current limiting resistor (R61), the two diodes (D11 and D12) at the rightmost side of the circuit clamp the voltage input into the singlechip between 0 and 3.3V, and the capacitor in the circuit plays a role of filtering; similarly, the temperature detection circuit can also be applied to the temperature measurement of the IGBT at the receiving end.
A user interface for displaying and inputting a limit value of a temperature;
the single chip microcomputer is connected with the temperature acquisition circuit and is connected with a user interface through a data transmission module; the single chip microcomputer is used for judging whether the temperature acquired by the temperature acquisition circuit exceeds an input limit value or not; the single chip microcomputer is connected with the receiving end IGBT and controls the on-off of the receiving end IGBT;
the over-temperature protection circuit is connected with the single chip microcomputer and is used for controlling the IGBT of the receiving end to be switched off when the temperature acquired by the temperature acquisition circuit exceeds an input limit value; as shown in fig. 3, the over-temperature protection circuit includes a first temperature switch (temperature switch 1), where the first temperature switch (temperature switch 1) is connected in parallel with a forty-second resistor (R42) and a diode (Dx 5), and is connected in series with a forty-second resistor (R40) after being connected in parallel; exemplarily, when the temperature measuring device is used, a port J8 of a pin connector (header 2) is connected with a first temperature switch (temperature switch 1), the first temperature switch (temperature switch 1) is in a normally open state in a normal state, no current exists in the whole circuit, an optical coupler is not conducted, when the temperature of a measured element exceeds a limit value, the first temperature switch (temperature switch 1) is closed, the current passes through a forty-second resistor (R40) and a forty-second resistor (R42) loop, due to the voltage division effect of the forty-second resistor (R42), the two ends of the optical coupler diode and the light emitting diode obtain enough conduction voltage, the optical coupler is conducted, a pin of a single chip microcomputer PE11 is changed into a low level, the single chip microcomputer controls the IGBT to be turned off at the moment, and the output of a receiving end is changed into 0.
The alarm circuit is connected with the single chip microcomputer and is used for reminding through a buzzer when the temperature acquired by the temperature acquisition circuit exceeds an input limit value; as shown in fig. 4, the alarm circuit includes a triode (Q1), the triode (Q1) is connected in parallel with a first capacitor (C1), then connected in parallel with a second resistor (R2), and then connected in series with a first resistor (R1); the triode (Q1) is connected with a loudspeaker (SPEAKER) in series, the loudspeaker (SPEAKER) is connected with a third capacitor (C3) in parallel and then connected with a first diode (D1) in parallel, and the loudspeaker (SPEAKER) is connected with a second capacitor (C2) in series after being connected with the third capacitor in parallel; when the alarm circuit works, the single chip microcomputer processes data collected by the current collection circuit and the temperature collection circuit and compares the data with a limit value, if the data exceed the limit value, the single chip microcomputer outputs a high level to the BUZZER, at the moment, the triode (Q1) is switched on, the BUZZER starts to work, when the single chip microcomputer outputs a low level, the triode (Q1) is switched off, and as the BUZZER is an inductive element, after the triode (Q1) is switched off, the BUZZER carries out follow current through the first diode (D1); in the circuit, the first resistor (R1) is a current-limiting resistor to prevent the current flowing into the triode (Q1) from being overlarge, and the second resistor (R2) is a pull-down resistor to ensure that the triode (Q1) can be stably turned off and can also be used as a discharge resistor of the first capacitor (C1); the first capacitor (C1), the second capacitor (C2) and the third capacitor (C3) are filter capacitors.
The circuit of the utility model also comprises a current collecting circuit, which is used for collecting the current on the coil of the pickup device; the current acquisition circuit is connected with the singlechip; as shown in fig. 5, the current collecting circuit includes a current transformer, and the current transformer is connected with a diode rectifier bridge; the diode rectifier bridge is connected with a thirteenth resistor (R13) in parallel, and the thirteenth resistor (R13) is connected with a thirtieth diode (D30) in parallel; the serial connection is carried out on the serial connection and a sixty-second resistor (R62), and the sixty-second resistor (R62), a twenty-fourth capacitor (C24) and a twenty-fifth capacitor (C25) are connected in parallel and then connected with the single chip microcomputer; when the circuit is used, the current flowing through the coil of the pickup is collected through the current transformer, the current is rectified through the diode rectifier bridge, the rectified direct current is sampled through the thirteenth resistor (R13) and converted into a voltage signal, then the voltage signal is transmitted to an analog-digital conversion pin of the single chip microcomputer through the current-limiting sixty-two resistor (R62), and the single chip microcomputer obtains the effective value of the coil current through the relation between the voltage signal and the original current. The twenty-fourth capacitor (C24) and the twenty-fifth capacitor (C25) are filter capacitors, and the two diodes, namely the diode (D7) and the diode (D8), are used for limiting a voltage signal connected to a pin of the single chip microcomputer to be between 0 and 3.3V.
The singlechip is STM32F407ZET6.
The utility model discloses a current acquisition circuit and temperature acquisition circuit acquisition electric current and temperature data, and in the data input singlechip that will gather, after singlechip AD conversion, the singlechip is handled the data of gathering, obtain the numerical value of picker coil current and magnetic core temperature, then come on showing user interface through data transmission module, data after will handling simultaneously carry out the comparison with the limit value, if the data after handling surpasses the limit value, the singlechip just sends the order and sends out the police dispatch newspaper and carries out the excess temperature protection through warning circuit.
The utility model discloses a temperature of receiving terminal magnetic core can be gathered in real time to the temperature of gathering to carrying out overtemperature protection and warning when exceeding the limit value to the temperature of gathering and reminding, making wireless power transmission system normal operating, stopping the operation of relevant equipment and sending out the police dispatch newspaper when the temperature exceeds the limit value, avoid the occurence of failure, holistic security when improving wireless power transmission system and using.
The technical scope of the present invention is not limited to the content in the above description, and those skilled in the art can make various modifications and alterations to the above embodiments without departing from the technical spirit of the present invention, and these modifications and alterations should fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a wireless power transmission system excess temperature protection circuit which characterized in that: comprises that
The temperature acquisition circuit is used for acquiring the temperature of the magnetic core and the temperature of the IGBT at the receiving end;
a user interface for displaying and inputting a limit value of a temperature;
the single chip microcomputer is connected with the temperature acquisition circuit and is connected with a user interface through a data transmission module; the single chip microcomputer is used for judging whether the temperature acquired by the temperature acquisition circuit exceeds an input limit value or not;
the over-temperature protection circuit is used for controlling the IGBT of the receiving end to be turned off when the temperature acquired by the temperature acquisition circuit exceeds an input limit value;
and the alarm circuit is used for reminding through a buzzer when the temperature acquired by the temperature acquisition circuit exceeds an input limit value.
2. The over-temperature protection circuit of claim 1, wherein: the temperature acquisition circuit comprises a thermistor attached to the magnetic core and the receiving end IGBT, and the thermistor is connected with the twenty-ninth diode in parallel and then connected with the operational amplifier in series; the operational amplifier is connected with the sixty-first current limiting resistor in series and then is connected with the single chip microcomputer.
3. The over-temperature protection circuit of the wireless power transmission system according to claim 1, wherein: the over-temperature protection circuit is connected with the single chip microcomputer and comprises a first temperature switch, wherein the first temperature switch is connected with a forty-second resistor and a diode in parallel and then connected with the forty-second resistor in series.
4. The over-temperature protection circuit of the wireless power transmission system according to claim 1, wherein: the alarm circuit is connected with the singlechip and comprises a triode, the triode is connected with the first capacitor in parallel and then connected with the second resistor in parallel, and the triode is connected with the first resistor in series after being connected in parallel; the triode is connected with the loudspeaker in series, the loudspeaker is connected with the third capacitor in parallel and then connected with the first diode in parallel, and the loudspeaker is connected with the second capacitor in series after being connected with the third capacitor in parallel.
5. The over-temperature protection circuit of the wireless power transmission system according to claim 1, wherein: the current acquisition circuit is used for acquiring the current on the coil of the pickup; the current acquisition circuit is connected with the singlechip.
6. The over-temperature protection circuit of the wireless power transmission system according to claim 5, wherein: the current acquisition circuit comprises a current transformer, and the current transformer is connected with a diode rectifier bridge; the diode rectifier bridge is connected with a thirteenth resistor in parallel, and the thirteenth resistor is connected with a thirtieth diode in parallel; and the sixty-second resistor is connected with the twenty-fourth capacitor and the twenty-fifth capacitor in parallel and then connected with the singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222742119.9U CN218386785U (en) | 2022-10-18 | 2022-10-18 | Over-temperature protection circuit of wireless power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222742119.9U CN218386785U (en) | 2022-10-18 | 2022-10-18 | Over-temperature protection circuit of wireless power transmission system |
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| Publication Number | Publication Date |
|---|---|
| CN218386785U true CN218386785U (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222742119.9U Active CN218386785U (en) | 2022-10-18 | 2022-10-18 | Over-temperature protection circuit of wireless power transmission system |
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| CN (1) | CN218386785U (en) |
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- 2022-10-18 CN CN202222742119.9U patent/CN218386785U/en active Active
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