CN210041316U - Over-temperature protection circuit - Google Patents
Over-temperature protection circuit Download PDFInfo
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- CN210041316U CN210041316U CN201920979441.9U CN201920979441U CN210041316U CN 210041316 U CN210041316 U CN 210041316U CN 201920979441 U CN201920979441 U CN 201920979441U CN 210041316 U CN210041316 U CN 210041316U
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Abstract
The utility model discloses an over-temperature protection circuit, which comprises a temperature detection circuit, a temperature hysteresis circuit and a switch circuit; the temperature detection circuit comprises a resistance voltage division network, the resistance voltage division network comprises a thermistor, and the output end of the resistance voltage division network is respectively and electrically connected with the switch circuit and the temperature hysteresis circuit. The over-temperature protection circuit detects the temperature of a power supply line by utilizing the characteristic that the resistance value of the thermistor is reduced along with the temperature rise, when the temperature reaches a temperature warning point, the switching circuit is disconnected from the power supply line, meanwhile, the temperature hysteresis circuit is opened, and the temperature recovery point of the switching circuit which is recovered and connected is retarded by adjusting the resistance of the resistance voltage division network, so that the thermal shock condition is avoided. Consequently the utility model discloses a simple electronic components has realized the temperature detection and the on-off control that charges to the power supply line, has reliably prevented product damage and the safety problem that arouses because of the power supply line is overheated effectively.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to an excess temperature protection circuit.
Background
With the increase of portable electronic products, various standard and non-standard charging modes are distributed. For the consumer, the charging protocol will not be matched too much, and the charging will be used for charging as long as the same interface is found. Different charging protocols are easy to cause various dangerous accidents due to different power supply capacities. The charging current which is most likely to occur is too large or the temperature is excessively concentrated, so that the device is locally burnt, and even the fire phenomenon occurs.
With the requirement for safe and reliable performance increasing and the design cost and reliability of the circuit being considered, it is very important to design a universal low-cost over-temperature protection circuit.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough, the utility model discloses the technical problem that will solve is: the over-temperature protection circuit realizes the functions of temperature detection and charging on-off control of a power supply line through simple electronic components, and reliably and effectively prevents product damage and safety problems caused by overheating of the power supply line.
In order to solve the technical problem, the technical scheme of the utility model is that:
an over-temperature protection circuit comprises a temperature detection circuit for detecting the temperature of a power supply line, a temperature hysteresis circuit and a switch circuit for controlling the on-off of the power supply line; the temperature detection circuit comprises a resistance voltage division network, and the resistance voltage division network comprises a thermistor with a negative temperature coefficient; the output end of the resistance voltage-dividing network outputs a voltage signal corresponding to the temperature of a power supply line, and the voltage signal is used as an enabling signal and is respectively transmitted to the switch circuit and the temperature hysteresis circuit; the switching circuit switches on and off the power supply line according to the voltage signal; the temperature hysteresis circuit adjusts the resistance value of the resistance voltage division network according to the voltage signal, so that the resistance voltage division network outputs a voltage signal corresponding to the temperature lower than the temperature warning point to conduct the switch circuit.
Preferably, the output end of the resistor voltage-dividing network is electrically connected with the enabling end of the switch circuit through a first inverter and a second inverter which are cascaded; the output end of the resistance voltage division network is electrically connected with the enabling end of the temperature hysteresis circuit through the first inverter.
Preferably, the resistor voltage-dividing network obtains a divided voltage by being electrically connected with a power input end.
Preferably, the resistor voltage-dividing network further includes a first voltage-dividing resistor and a second voltage-dividing resistor; the first voltage-dividing resistor, the thermistor and the second voltage-dividing resistor are connected in series, the first voltage-dividing resistor is connected with the power input end, the second voltage-dividing resistor is grounded, and the second voltage-dividing resistor is electrically connected with the temperature hysteresis circuit.
Preferably, the switching circuit includes a first switching tube and a second switching tube, a control end of the second switching tube is electrically connected with an output end of the resistance voltage division network, an output end of the second switching tube is electrically connected with a control end of the first switching tube, and an output end of the first switching tube is electrically connected with a power supply output end; the second switch tube is switched on and switched off according to a voltage signal output by the output end of the resistance voltage division network, and controls the first switch to be switched on and switched off.
Preferably, the first switch tube is a P-type field effect tube, and the second switch tube is an N-type field effect tube; the grid electrode of the first switch tube is connected with the drain electrode of the second switch tube, the drain electrode of the first switch tube is connected with the power supply input end, and the source electrode of the first switch is connected with the power supply output end; the grid electrode of the second switch tube is electrically connected with the output end of the resistance voltage division network, and the source electrode of the second switch tube is grounded.
Preferably, the temperature hysteresis circuit includes a third switching tube, a control end of the third switching tube is electrically connected to an output end of the resistor voltage-dividing network, and an output end of the third switching tube is connected to a connection end of the second voltage-dividing resistor and the thermistor; and the third switching tube is switched on and off according to the voltage signal output by the output end of the resistance voltage division network, so that the second voltage division resistor is short-circuited and connected into the resistance voltage division network.
Preferably, the third switch is an N-type field effect transistor; the grid electrode of the third switching tube is electrically connected with the output end of the resistor voltage-dividing network, the drain electrode of the third switching tube is connected with the second voltage-dividing resistor, and the source electrode of the third switching tube is grounded.
Preferably, a voltage stabilizing circuit is arranged between the first voltage dividing resistor and the power input end.
Preferably, the resistance values of the first voltage-dividing resistor and the second voltage-dividing resistor are selected according to the voltage of a power supply line.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
the over-temperature protection circuit comprises a temperature detection circuit, a temperature hysteresis circuit and a switch circuit; the temperature detection circuit comprises a resistance voltage division network, the resistance voltage division network comprises a thermistor with a negative temperature coefficient, the output end of the resistance voltage division network outputs a voltage signal corresponding to the temperature of a power supply line, the voltage signal is used as an enabling signal and is respectively transmitted to the switch circuit and the temperature hysteresis circuit, and the switch circuit switches on and off the power supply line according to the voltage signal; the temperature hysteresis circuit adjusts the resistance value of the resistance voltage division network according to the voltage signal, so that the resistance voltage division network outputs a voltage signal corresponding to the temperature lower than the temperature warning point to switch on the switch circuit. The utility model discloses utilized thermistor along with the characteristic that the temperature rise resistance reduces, detected the temperature of power supply line, when the temperature reaches temperature warning point, switching circuit disconnection power supply line, temperature hysteresis circuit is opened simultaneously, through the resistance of adjustment resistance partial pressure network, the temperature that makes switching circuit resume to switch on is less than the temperature of temperature warning point to the condition of having avoided the thermal shock to take place. It can be seen that, the utility model discloses an excess temperature protection circuit through simple electronic components, has realized the temperature detection and the on-off control function that charges to the power supply line, has reliably prevented product damage and the safety problem that arouses because of the power supply line is overheated effectively.
The output end of the resistance voltage division network is electrically connected with the enabling end of the switch circuit through the first phase inverter and the second phase inverter which are cascaded; the output end of the resistor voltage division network is electrically connected with the enabling end of the temperature hysteresis circuit through a first inverter; the switch circuit and the temperature hysteresis circuit can reliably act, and misoperation caused by signal fluctuation is avoided.
Because a voltage stabilizing circuit is arranged between the first voltage dividing resistor and the power supply input end; the temperature detection circuit is made to acquire a divided voltage of the temperature so as to reliably operate.
The resistance voltage-dividing network also comprises a first voltage-dividing resistor and a second voltage-dividing resistor; the first voltage-dividing resistor, the thermistor and the second voltage-dividing resistor are connected in series, the first voltage-dividing resistor is also connected with the power supply input end, the second voltage-dividing resistor is grounded, and two ends of the second voltage-dividing resistor are respectively and electrically connected with the temperature hysteresis circuit; the circuit has simple structure and low cost, and can simply and flexibly adjust the resistance values of the first divider resistor and the second divider resistor to set a temperature warning point and a temperature recovery point.
Drawings
Fig. 1 is a circuit topology diagram of the over-temperature protection circuit of the present invention;
fig. 2 is a circuit diagram of the over-temperature protection circuit of the present invention;
FIG. 3 is a temperature variation curve of a negative temperature coefficient of resistance;
FIG. 4 is a hysteresis temperature graph;
in the figure: the circuit comprises a 1-resistor voltage division network, a 2-temperature hysteresis circuit, a 3-switch circuit, an INV 1-a first inverter, an INV 2-a second inverter, a 4-output end of the resistor voltage division network, a 5-enable end of the switch circuit and a 6-enable end of the temperature hysteresis circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 4, an over-temperature protection circuit includes a temperature detection circuit for detecting the temperature of a power supply line, a temperature hysteresis circuit 2, and a switch circuit 3 for controlling the on/off of the power supply line; the temperature detection circuit comprises a resistance voltage division network 1, wherein the resistance voltage division network 1 comprises a thermistor RNTC with a negative temperature coefficient; the output end 4 of the resistance voltage-dividing network outputs a voltage signal corresponding to the temperature of the power supply line, and the voltage signal is used as an enabling signal and is respectively transmitted to the switch circuit 3 and the temperature hysteresis circuit 2, so that the switch circuit 3 is switched on and switched off the power supply line; the temperature hysteresis circuit 2 adjusts the resistance value of the resistance voltage division network 1 according to the voltage signal, so that the resistance voltage division network 1 outputs a voltage signal corresponding to the temperature lower than the temperature warning point to turn on the switch circuit 3, and the delay of switching the power supply line from off to on is realized.
The utility model discloses an excess temperature protection circuit utilizes thermistor RNTC to reduce the characteristic along with the temperature rising resistance, detects supply circuit's temperature, makes the voltage signal that output 4 of resistance voltage divider network corresponds according to the temperature output. In an initial state, the switch circuit 3 is switched on, the temperature hysteresis circuit 2 is switched off, the power supply line is charged in a switched-on state, and when the temperature of the power supply line reaches a temperature warning point, the voltage signal output by the output end 4 of the resistance voltage division network switches off the switch circuit 3, so that the power supply line is cut off, and the purpose of protection is achieved; meanwhile, the temperature hysteresis circuit 2 is switched on to adjust the resistance of the resistance voltage division network 1, the resistance value of the thermistor RNTC is increased along with the reduction of the temperature of a power supply line, when the temperature is reduced to a temperature recovery point, the resistance value of the thermistor RNTC can enable the resistance voltage division network 1 to output a voltage signal for switching on the switch circuit 3, and meanwhile, the temperature hysteresis circuit 2 is switched off, so that the occurrence of thermal shock is avoided. Consequently the utility model discloses an excess temperature protection circuit through simple electronic components, has realized that the product that arouses because of the power supply line is overheated damages and the safety problem effectively to the temperature detection of power supply line and the break-make control function that charges.
As shown in fig. 2, the output terminal 4 of the resistance voltage divider network is electrically connected to the enable terminal 5 of the switch circuit through the cascaded first inverter INV1 and second inverter INV 2; the output end 4 of the resistance voltage division network is electrically connected with the enable end 6 of the temperature hysteresis circuit through a first inverter INV1, specifically: the output end of the second inverter INV2 is connected to the gate of the second switch tube Q2, and the output end of the first inverter INV1 is connected to the gate of the third switch tube Q3; the first inverter INV1 and the second inverter INV2 allow the switching circuit 3 and the temperature hysteresis circuit 2 to operate reliably, and do not malfunction due to signal fluctuation.
As shown in fig. 2 and 3, the thermistor RNTC is preferably NCP15XH103J03RC, and one end of the thermistor RNTC is an output terminal 4 of the resistor voltage dividing network. The resistance voltage-dividing network 1 further comprises a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2; the first voltage-dividing resistor R1, the thermistor RNTC and the second voltage-dividing resistor R2 are connected in series, the first voltage-dividing resistor R1 is further connected to the power input end, the second voltage-dividing resistor R2 is grounded, and both ends of the second voltage-dividing resistor R2 are respectively electrically connected to the temperature hysteresis circuit 2, in this example, the second voltage-dividing resistor R2 is connected in parallel with the drain and the source of the third switch Q3, when the third switch Q3 is turned on, the second voltage-dividing resistor R2 is short-circuited, the resistor voltage-dividing network 1 is only the first voltage-dividing resistor R1 and the thermistor RNTC, and when the third switch Q3 is turned off, the second voltage-dividing resistor R2 is connected to the resistor voltage-dividing network 1 again.
As shown in fig. 2, the switching circuit 3 includes a first switching tube Q1 and a second switching tube Q2, a control terminal of the second switching tube Q2 is electrically connected to the output terminal 4 of the resistor voltage dividing network, an output terminal of the second switching tube Q2 is electrically connected to a control terminal of the first switching tube Q1, and an output terminal of the first switching tube Q1 is electrically connected to the power output terminal; the second switch tube Q2 is turned on and off according to the voltage signal output by the output terminal 4 of the resistor divider network, and controls the first switch tube Q1 to be turned on and off. The first switch tube Q1 is a P-type field effect transistor, and the second switch tube Q2 is an N-type field effect transistor; the grid electrode of the first switching tube Q1 is connected with the drain electrode of the second switching tube Q2, the drain electrode of the first switching tube Q1 is connected with the power supply input end, and the source electrode of the first switching tube Q1 is connected with the power supply output end; the grid electrode of the second switch tube Q2 is electrically connected with the output end 4 of the resistance voltage division network, and the source electrode of the second switch tube Q2 is grounded; in this example, a resistor R3 is connected in series between the drain and the gate of the first switching transistor Q1. In addition, the switching circuit 3 is not limited to the field effect transistor listed above, and may be configured to switch on or off the power supply line according to the voltage signal output from the output terminal 4 of the resistance voltage divider network.
As shown in fig. 2, the temperature hysteresis circuit 2 includes a third switching tube Q3, a control terminal of the third switching tube Q3 is electrically connected to the output terminal 4 of the resistor voltage dividing network, and an output terminal of the third switching tube Q3 is connected to the connection terminal of the second voltage dividing resistor R2 and the thermistor RNTC; the third switching tube Q3 short-circuits the second voltage-dividing resistor R2 according to the voltage signal output by the output terminal 4 of the resistor voltage-dividing network, or reconnects the second voltage-dividing resistor R2 to the resistor voltage-dividing network 1. The third switch is an N-type field effect transistor; the gate of the third switching tube Q3 is electrically connected to the output terminal 4 of the resistor divider network, the drain is connected to the second divider resistor R2, and the source is grounded. Of course, the third switch Q3 is not limited to the fet listed above, as long as it can short-circuit and restore the second divider resistor R2 according to the voltage signal output from the output terminal 4 of the resistor divider network.
A voltage stabilizing circuit LDO is arranged between the first voltage dividing resistor R1 and the power input end, and the voltage stabilizing circuit LDO provides stable voltage dividing voltage, so that the resistor voltage dividing network 1 can work reliably, and the performance is more reliable. The LDO voltage stabilizing circuit can be selected according to a power supply line, and the LDO voltage stabilizing circuit outputs 0.9V voltage in the embodiment.
The resistance values of the first divider resistor R1 and the second divider resistor R2 are selected according to the voltage of a power supply line, and the temperature warning point and the temperature recovery point are set by changing the resistance values of the first divider resistor R1 and the second divider resistor R2, so that the operation is simple, convenient, flexible and reliable.
The principle of the over-temperature protection circuit of the embodiment is as follows:
the temperature detection circuit comprises a voltage stabilizing circuit LDO which provides stable voltage for the acquisition resistor voltage division network 1, a first voltage division resistor R1, a second voltage division resistor R2 and a thermistor RNTC form the resistor voltage division network 1, and the resistor voltage division network 1 converts the temperature change of a power supply line into a voltage signal VcontrolThe formula is as follows;
the temperature hysteresis circuit 2 can change V in the formula (1) by controlling the third switching tube Q3 to be turned on and offcontrolThe value of (c). The on/off of the third switching tube Q3 is determined by the equation (1) described above. When the third switching tube Q3 is turned on, R2Is short-circuited, at this time VcontrolIs determined by the following equation.
A first switching tube Q1 of the switching circuit 3 controls the on-off of a power supply line; the second switch tube Q2 receives the voltage signal transmitted by the temperature detection circuit and controls the on and off of the first switch tube Q1; r3The first switch Q1 is set to the off state by default.
The specific working process is as follows:
under the condition of normal temperature: the temperature is 25 ℃ for example. At normal temperature, VcontrolThe voltage is set to about 0.9V (which may be set according to different circuits), at this time, the second switching tube Q2 is turned on, the third switching tube Q3 is turned off, the first switching tube Q1 is turned on, the power supply line is in a conducting state, and the power output end supplies power normally.
Temperature rising process: if the supply current is too large or abnormal, the temperature in the region rises, the resistance value of the thermistor RNTC becomes smaller along with the rise of the temperature, and V can be known from the formula (1)controlIs decreased, when the set temperature warning point is reached, VcontrolWhen the voltage of the output end 4 of the resistor voltage dividing network is reduced to the lower limit of the voltage, the output voltage of the resistor voltage dividing network passes through the first inverter INV1 and the second inverter INV2, and a low level is output to the grid electrode of the second switching tube Q2, so that the second switching tube Q2 is cut off, the first switching tube Q1 is also cut off, the power supply line is in a cut-off state, the power supply output end supplies power abnormally, and the temperature is prevented from rising again.
And (3) recovery process: after the power supply line is cut off, the output end 4 of the resistor voltage dividing network transmits a high level to the grid electrode of the third switching tube Q3 through the first inverter INV1 to enable the third switching tube Q3 to be conducted, the second voltage dividing resistor R2 is in short circuit, and V is at the momentcontrolThe value of (2) is determined by the formula (2), that is, to recover to the previous line conducting state, the resistance value of the thermistor RNTC needs to be recovered to the initial state, that is, the sum of the resistance values of the thermistor RNTC and the second divider resistor R2 in the formula (1), and at this time, the temperature value of the power supply line is lower than the temperature warning point (the characteristic of the thermistor RNTC, the lower the temperature is, the larger the resistance value is, and the higher the temperature is, the smaller the resistance value is), so that temperature hysteresis is realized, that is, the turn-off temperature T0 from low temperature to high temperature is higher than the recovery temperature T1 from high temperature to low temperature, and thermal shock of the line at the overheating temperature.
To sum up, the over-temperature protection circuit of the utility model realizes the detection of the temperature of the power supply line through the temperature detection circuit, the temperature hysteresis circuit 2 and the switch circuit 3, cuts off the power supply line if the temperature is higher than the over-temperature warning point, and reopens the power supply line if the temperature is recovered to the temperature recovery point; meanwhile, the thermal shock phenomenon that the electric circuit is frequently closed and opened near the warning temperature point is also prevented; the resistance value of the second divider resistor R2 can be changed to be lower than that of the first divider resistor R1 simply and flexibly, so that a temperature warning point and a temperature recovery point are set flexibly and reliably; the cost is lower, and the reliability is good.
The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent improvements of the over-temperature protection circuit structure, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (10)
1. The over-temperature protection circuit is characterized by comprising a temperature detection circuit for detecting the temperature of a power supply line, a temperature hysteresis circuit and a switch circuit for controlling the on-off of the power supply line;
the temperature detection circuit comprises a resistance voltage division network, and the resistance voltage division network comprises a thermistor with a negative temperature coefficient; the output end of the resistance voltage-dividing network outputs a voltage signal corresponding to the temperature of a power supply line, and the voltage signal is used as an enabling signal and is respectively transmitted to the switch circuit and the temperature hysteresis circuit;
the switching circuit switches on and off the power supply line according to the voltage signal;
the temperature hysteresis circuit adjusts the resistance value of the resistance voltage division network according to the voltage signal, so that the resistance voltage division network outputs a voltage signal corresponding to the temperature lower than the temperature warning point to conduct the switch circuit.
2. The over-temperature protection circuit according to claim 1,
the output end of the resistance voltage division network is electrically connected with the enabling end of the switch circuit through a first phase inverter and a second phase inverter which are cascaded;
the output end of the resistance voltage division network is electrically connected with the enabling end of the temperature hysteresis circuit through the first inverter.
3. The over-temperature protection circuit of claim 2, wherein the resistive voltage divider network obtains a divided voltage by electrically connecting to a power input.
4. The over-temperature protection circuit of claim 3, wherein the resistive voltage divider network further comprises a first voltage divider resistor and a second voltage divider resistor; the first voltage-dividing resistor, the thermistor and the second voltage-dividing resistor are connected in series, the first voltage-dividing resistor is connected with the power input end, the second voltage-dividing resistor is grounded, and the second voltage-dividing resistor is electrically connected with the temperature hysteresis circuit.
5. The excess temperature protection circuit according to any one of claims 1 to 4,
the switching circuit comprises a first switching tube and a second switching tube, wherein the control end of the second switching tube is electrically connected with the output end of the resistance voltage division network, the output end of the second switching tube is electrically connected with the control end of the first switching tube, and the output end of the first switching tube is electrically connected with the output end of the power supply;
the second switch tube is switched on and switched off according to a voltage signal output by the output end of the resistance voltage division network, and controls the first switch to be switched on and switched off.
6. The over-temperature protection circuit of claim 5,
the first switch tube is a P-type field effect tube, and the second switch tube is an N-type field effect tube;
the grid electrode of the first switch tube is connected with the drain electrode of the second switch tube, the drain electrode of the first switch tube is connected with the power supply input end, and the source electrode of the first switch is connected with the power supply output end;
the grid electrode of the second switch tube is electrically connected with the output end of the resistance voltage division network, and the source electrode of the second switch tube is grounded.
7. The over-temperature protection circuit according to claim 4, wherein the temperature hysteresis circuit comprises a third switching tube, a control end of the third switching tube is electrically connected with an output end of the resistor voltage-dividing network, and an output end of the third switching tube is connected with a connecting end of the second voltage-dividing resistor and the thermistor;
and the third switching tube is switched on and off according to the voltage signal output by the output end of the resistance voltage division network, so that the second voltage division resistor is short-circuited and connected into the resistance voltage division network.
8. The over-temperature protection circuit of claim 7,
the third switch is an N-type field effect transistor;
the grid electrode of the third switching tube is electrically connected with the output end of the resistor voltage-dividing network, the drain electrode of the third switching tube is connected with the second voltage-dividing resistor, and the source electrode of the third switching tube is grounded.
9. The over-temperature protection circuit of claim 4, wherein a voltage stabilizing circuit is disposed between the first voltage dividing resistor and the power input terminal.
10. The overheat protection circuit according to claim 4, wherein the resistances of the first voltage-dividing resistor and the second voltage-dividing resistor are selected in accordance with a supply line voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920979441.9U CN210041316U (en) | 2019-06-26 | 2019-06-26 | Over-temperature protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920979441.9U CN210041316U (en) | 2019-06-26 | 2019-06-26 | Over-temperature protection circuit |
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| CN210041316U true CN210041316U (en) | 2020-02-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504491A (en) * | 2020-05-28 | 2020-08-07 | 为麦智能科技(天津)有限公司 | Data processing method, temperature detection circuit and electronic equipment |
| CN111786356A (en) * | 2020-08-03 | 2020-10-16 | 郑州森鹏电子技术有限公司 | High-side switch circuit |
| CN112362180A (en) * | 2020-10-15 | 2021-02-12 | 国网思极紫光(青岛)微电子科技有限公司 | Temperature difference detection circuit for over-temperature protection |
| CN114370948A (en) * | 2020-10-14 | 2022-04-19 | 福州市瓦涵新能源科技有限公司 | Circuit and method for improving NTC temperature sampling precision |
| CN117498661A (en) * | 2023-11-07 | 2024-02-02 | 瑞森半导体科技(广东)有限公司 | Power supply management chip |
-
2019
- 2019-06-26 CN CN201920979441.9U patent/CN210041316U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504491A (en) * | 2020-05-28 | 2020-08-07 | 为麦智能科技(天津)有限公司 | Data processing method, temperature detection circuit and electronic equipment |
| CN111504491B (en) * | 2020-05-28 | 2022-05-10 | 为麦智能科技(天津)有限公司 | Data processing method, temperature detection circuit and electronic equipment |
| CN111786356A (en) * | 2020-08-03 | 2020-10-16 | 郑州森鹏电子技术有限公司 | High-side switch circuit |
| CN114370948A (en) * | 2020-10-14 | 2022-04-19 | 福州市瓦涵新能源科技有限公司 | Circuit and method for improving NTC temperature sampling precision |
| CN112362180A (en) * | 2020-10-15 | 2021-02-12 | 国网思极紫光(青岛)微电子科技有限公司 | Temperature difference detection circuit for over-temperature protection |
| CN112362180B (en) * | 2020-10-15 | 2022-08-12 | 国网思极紫光(青岛)微电子科技有限公司 | Temperature difference detection circuit for over-temperature protection |
| CN117498661A (en) * | 2023-11-07 | 2024-02-02 | 瑞森半导体科技(广东)有限公司 | Power supply management chip |
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