CN111799761A - Temperature protection method and circuit based on pin multiplexing - Google Patents
Temperature protection method and circuit based on pin multiplexing Download PDFInfo
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- CN111799761A CN111799761A CN202010591416.0A CN202010591416A CN111799761A CN 111799761 A CN111799761 A CN 111799761A CN 202010591416 A CN202010591416 A CN 202010591416A CN 111799761 A CN111799761 A CN 111799761A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1255—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to internal faults, e.g. by monitoring ripple in output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Power Conversion In General (AREA)
Abstract
The embodiment of the invention discloses a temperature protection method and a temperature protection circuit based on pin multiplexing. The method comprises the following steps: detecting the real-time driving output current of the driving output pin through a temperature coefficient temperature detection sub-circuit; the temperature coefficient temperature detection sub-circuit and the grid electrode of the power tube multiplex a driving output pin of the control chip; and if the temperature is judged to be too high based on the real-time driving output current, stopping the power tube from working. The circuit comprises a power tube, a control chip and a temperature coefficient temperature detection sub-circuit; the control chip comprises a signal processing sub-circuit; the temperature coefficient temperature detection sub-circuit and the grid electrode of the power tube multiplex a driving output pin of the control chip; the temperature coefficient temperature detection sub-circuit is at least provided with a temperature coefficient thermistor, the resistance value of which changes along with the temperature change and is arranged outside the control chip. The embodiment of the invention can improve the temperature protection reliability of the conversion circuit.
Description
Technical Field
The invention relates to the technical field of circuit temperature protection, in particular to a temperature protection method and a temperature protection circuit based on pin multiplexing.
Background
In a conversion circuit such as an AC-DC conversion circuit, a power tube such as a MOSFET tube is controlled by a control chip (also referred to as a controller) to realize conversion. As electronic devices such as chargers continue to shrink in size, the size of the conversion circuits installed therein also needs to be reduced accordingly. Therefore, in a typical AC-DC conversion circuit, the control chip has only six pins, and no additional pin is used for temperature detection. Of course, it is also possible to add one pin to a control chip having six pins, but this increases the volume. One current practice is to rely on a temperature sensing circuit inside the control chip to achieve temperature protection, but this is not reliable.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and it is not necessarily prior art to the present invention, and should not be used for evaluating the novelty and inventive step of the present invention in the case that there is no clear evidence that the above disclosure has been made before the filing date of the present application.
Disclosure of Invention
The invention provides a temperature protection method and circuit based on pin multiplexing, which can realize the overall temperature detection of a conversion circuit and improve the temperature protection reliability of the conversion circuit.
In a first aspect, the present invention provides a temperature protection method based on pin multiplexing, including:
a1, detecting the real-time driving output current of the driving output pin through a temperature coefficient temperature detection sub-circuit; the temperature coefficient temperature detection sub-circuit and the grid electrode of the power tube are multiplexed with the driving output pin of the control chip, and the real-time driving output current changes along with the change of temperature to the temperature coefficient temperature detection sub-circuit;
a2, if the temperature is judged to be too high based on the real-time driving output current, stopping the power tube from working;
the temperature coefficient temperature detection sub-circuit is at least provided with a temperature coefficient thermistor of which the resistance value changes along with the temperature change; the temperature coefficient thermistor is arranged outside the control chip.
In some preferred embodiments, said a2 specifically comprises: obtaining a real-time voltage based on the real-time drive output current; and if the real-time voltage reaches the specified condition, stopping the power tube from working.
In some preferred embodiments, the obtaining of the real-time voltage based on the real-time driving output current specifically includes: and generating a mirror current in a specified proportion to the real-time driving output current, and obtaining real-time voltage according to the mirror current.
In some preferred embodiments, the reaching of the specified condition by the real-time voltage specifically includes:
the real-time voltage is greater than a first threshold;
alternatively, the real-time voltage is less than a second threshold.
In some preferred embodiments, the temperature coefficient thermistor is a negative temperature coefficient thermistor; the A2 specifically comprises: and judging that the temperature is too high based on the real-time driving output current, and stopping the power tube.
In some preferred embodiments, the stopping the power tube specifically includes: and outputting a power supply control signal to close the driving grid end of the power tube.
In some preferred embodiments, the temperature coefficient temperature detection sub-circuit is a negative temperature coefficient thermistor; one end of the negative temperature coefficient thermistor is arranged on a line, connected with a driving output pin of the control chip, of a grid electrode of the power tube; the other end of the negative temperature coefficient thermistor is grounded;
or the temperature coefficient temperature detection sub-circuit comprises a negative temperature coefficient thermistor and a grid pull-down resistor; the negative temperature coefficient thermistor is connected with the grid pull-down resistor in series.
In a second aspect, the present invention provides a circuit based on pin multiplexing, which includes a power transistor, a control chip and a temperature coefficient temperature detection sub-circuit; the control chip comprises a signal processing sub-circuit;
the control chip is provided with a driving output pin;
the temperature coefficient temperature detection sub-circuit and the grid electrode of the power tube multiplex a driving output pin of the control chip so as to detect the real-time driving output current of the control chip;
the temperature coefficient temperature detection sub-circuit is at least provided with a temperature coefficient thermistor of which the resistance finger changes along with the temperature change; the temperature coefficient thermistor is arranged outside the control chip; wherein the real-time drive output current varies with the temperature variation caused by the temperature to the temperature coefficient temperature detection sub-circuit;
the signal processing sub-circuit is to: and judging whether the temperature is too high or not based on the real-time driving output current, and if the temperature is too high, stopping the power tube.
In some preferred embodiments, the signal processing sub-circuit comprises a comparison sub-circuit and a signal conversion sub-circuit;
the signal conversion sub-circuit is configured to: obtaining a real-time voltage based on the real-time drive output current;
the comparison sub-circuit is configured to: and judging whether the real-time voltage reaches a specified condition, if so, outputting a power supply control signal to close the driving grid terminal of the power tube.
In some preferred embodiments, the signal conversion sub-circuit comprises a current device and a first resistor RINT；
The current device is used for: generating a mirror current in a prescribed proportion to the real-time driving output current and inputting the mirror current to the first resistor RINT；
The current devices include a first current device A1 and a second current device A2 that are current proportional; the first current device A1 is used for detecting the real-time driving output current flowing through the temperature coefficient temperature detection sub-circuit; the second current device A2 is used for generating a mirror current according to the current detected by the first current device in a specified proportion and inputting the mirror current to the first resistor RINT。
In some preferred embodiments, the temperature coefficient temperature detection sub-circuit is a negative temperature coefficient thermistor RNTC(ii) a The negative temperature coefficient thermistor RNTCOne end of the power tube is arranged on a line that the grid electrode of the power tube is connected to the driving output pin of the control chip; the negative temperature coefficient thermistor RNTCThe other end of the first and second electrodes is grounded; the first current device A1 is connected to the negative temperature coefficient thermistor RNTCOne end of (a); the second current device A2 is connected to the first resistor RINTOne end of (a); the first resistor RINTThe other end of the first and second electrodes is grounded;
or the temperature coefficient temperature detection sub-circuit comprises a negative temperature coefficient thermistor RNTCAnd a gate pull-down resistor Rg(ii) a The negative temperature coefficient thermistor RNTCAnd the gate pull-down resistor RgAre connected in series; the first current device A1 is connected to the gate pull-down resistor RgOne end of (a); the negative temperature coefficient thermistor RNTCOne end of which is connected to the gate pull-down resistor RgThe other end of (a); the negative temperature coefficient thermistor RNTCAnd the other end of the same is grounded.
In some preferred embodiments, the pin multiplexing based circuit is a flyback converter circuit.
In a third aspect, the invention provides a computer-readable storage medium comprising: the computer-readable storage medium has stored therein program instructions that, when executed by a processor of a computer, cause the processor to perform the above-described method.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the driving output pin of the power tube is used for multiplexing as a temperature coefficient temperature detection sub-circuit, accurate temperature detection can be realized and the circuit can be protected by detecting the real-time driving output current of the control chip, the whole temperature detection of the circuit can be realized, and the reliability of temperature protection can be improved.
Drawings
Fig. 1 is a schematic flow chart of a temperature protection method based on gate pin multiplexing according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit based on pin multiplexing according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a circuit based on pin multiplexing according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a control chip according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a circuit based on pin multiplexing according to another embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present invention more clearly apparent, the present invention is further described in detail below with reference to fig. 1 to 5 and the 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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixation or for circuit connection.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
For the converter circuit, although temperature protection can be realized by means of a temperature detection circuit inside the control chip, the highest temperature of the system does not exist in the control chip, but exists in the power tube; therefore, the actual effect of temperature detection inside the control chip is not good.
To this end, the present embodiment provides a temperature protection method based on pin (also referred to as pin bit) multiplexing, and provides a circuit based on pin multiplexing. The circuit based on pin multiplexing of the present embodiment is a switching converter circuit, such as a flyback converter circuit (or referred to as a flyback power adapter circuit).
The circuit based on pin multiplexing of the present embodiment can implement the temperature protection method based on pin multiplexing of the present embodiment.
Referring to fig. 2, the circuit based on pin multiplexing of the present embodiment includes a power tube 1, a control chip 2, and a temperature coefficient temperature detection sub-circuit 3. The power tube 1 is a primary power tube of the flyback converter circuit.
Referring to fig. 2, the control chip 2 is provided with six pins, which are a driving output pin OUT, a pin VCC, a pin CS, a pin GND, a pin FB, and a pin VMS, respectively.
The temperature coefficient temperature detection sub-circuit 3 and the grid of the power tube 1 are multiplexed to control the driving output pin OUT of the chip 2. Specifically, one end of the temperature coefficient temperature detection sub-circuit 3 and the gate of the power tube 1 are connected to the driving output pin OUT of the control chip 2; the other end of the temperature coefficient temperature detection sub-circuit 3 is grounded.
The temperature coefficient temperature detection sub-circuit 3 is at least provided with a temperature coefficient thermistor of which the resistance changes along with the temperature change. In the present embodiment, the temperature coefficient temperature detection sub-circuit 3 is a temperature coefficient thermistor, wherein the temperature is detected by the temperature coefficient temperature detection sub-circuitThe Coefficient of Temperature thermistor is Negative Temperature Coefficient (NTC) thermistor RNTC. Negative temperature coefficient thermistor RNTCIs arranged outside the control chip 2. In other embodiments, the temperature coefficient thermistor is a positive temperature coefficient thermistor.
Referring to fig. 1, the temperature protection method based on gate pin multiplexing of the present embodiment includes step a1 and step a 2.
Step A1, detecting the real-time driving output current I of the driving output pin OUT through the temperature coefficient temperature detection sub-circuit 3gate。
As described above, the temperature coefficient temperature detection sub-circuit 3 and the gate of the power transistor 1 are multiplexed to control the driving output pin OUT of the chip 2.
Referring to fig. 3, when the gate voltage V of the power transistor 1 is appliedgateWhen the temperature rises to a steady state, the output current of the driving output pin OUT flows through the temperature coefficient temperature detection sub-circuit 3, namely flows through the negative temperature coefficient thermistor RNTC. Thus, the temperature coefficient temperature detection sub-circuit 3 can detect the real-time driving output current I of the driving output pin OUTgate. Since the temperature coefficient temperature detection sub-circuit 3 is temperature dependent, when the temperature changes the temperature coefficient temperature detection sub-circuit 3, the real-time driving output current of the driving output pin OUT also changes.
Step A2, if based on real-time driving output current IgateWhen the temperature is determined to be too high, the power tube 1 is stopped.
Temperature coefficient temperature detector circuit 3, namely negative temperature coefficient thermistor RNTCIs arranged outside the control chip 2 and close to the power tube 1. The negative temperature coefficient thermistor R is influenced by the temperature change caused after the power tube 1 is heated for a period of timeNTCThe temperature coefficient temperature detection sub-circuit 3 can sense the temperature change of the power tube 1. For negative temperature coefficient thermistor RNTCIn other words, the higher the temperature, the smaller the resistance value; then, the temperature-to-NTC thermistor RNTCThe resulting change is a change in resistance; flowing through negative temperature coefficient thermistor RNTCHas a current of INTC. Because of the negative temperature coefficient thermistor RNTCIs temperature dependent, so that the current INTCAlso varies with temperature.
Output current I based on real-time drivinggateA corresponding real-time voltage V can be obtainedNTCI.e. will drive the output current I in real timegateConversion to real-time voltage VNTC(ii) a Illustratively, by a first resistance RINTWill drive the output current I in real timegateConversion to real-time voltage VNTC(ii) a Wherein the first resistor RINTIs constant or within a tolerance range; in particular, the output current I is generated and driven in real timegateProportional mirror current IINTAccording to the mirror current IINTObtain a real-time voltage VNTCE.g. so that the mirror current IINTFlows through the first resistor RINTThen the real-time voltage V can be obtainedNTCWherein V isNTC＝IINTRINT. The negative temperature coefficient thermistor R can be caused by the temperature rise of the power tube 1NTCBecomes small, then the output current I is driven in real timegateBecomes larger and the mirror current IINTOutput current I following real-time drivinggateBecomes large due to the first resistance RINTConstant resistance value of (1), real-time voltage VNTCAnd also becomes larger as the temperature increases. If the real-time voltage VNTCTo a specified condition, e.g. real-time voltage VNTCGreater than a first threshold value, wherein the first threshold value is a reference voltage VrefIf the temperature of the power tube 1 is too high, the power supply for supplying power to the power tube 1 is turned off to stop the operation of the power tube 1.
One way to stop the power tube 1 is to: the power control signal OTP is output to turn off the driving gate terminal of the power transistor 1.
Referring to fig. 4, for the pin multiplexing-based circuit of the present embodiment, the control chip 2 includes a signal processing sub-circuit 200.
The signal processing sub-circuit 200 is configured to: output current I based on real-time drivinggateAnd judging whether the temperature is too high, and if the temperature is too high, stopping the power tube 1.
The signal processing sub-circuit 200 comprises a signal conversion sub-circuit 21 and a comparison sub-circuit 22.
The signal conversion sub-circuit 21 is configured to: output current I based on real-time drivinggateObtain a real-time voltage VNTC。
The comparison sub-circuit 22 is configured to: determine the real-time voltage VNTCAnd if the specified condition is met, outputting a power supply control signal OTP to close the driving grid end of the power tube 1, so that the power tube 1 stops working.
The signal conversion sub-circuit 21 includes a current device 211 and a first resistor RINT。
The current device 211 is used to: generating and driving an output current I in real timegateMirror current I in a given ratio kINTAnd input to the first resistor RINT. Wherein k is IINT/Igate＝IINT/INTC。
Referring to FIG. 4, the temperature detecting sub-circuit 3 is a negative temperature coefficient thermistor RNTCIn the case of a negative temperature coefficient thermistor RNTCOne end of the negative temperature coefficient thermistor is arranged on a line 100 that the grid of the power tube 1 is connected to a driving output pin OUT of the control chip 2, namely the negative temperature coefficient thermistor RNTCOne end of the driving transistor (1) shares a driving output pin with the grid electrode of the power tubeAnd (OUT). Negative temperature coefficient thermistor RNTCAnd the other end of the same is grounded. The first current device A1 is connected to the negative temperature coefficient thermistor RNTCTo detect the flow of the negative temperature coefficient thermistor RNTCReal-time driving output current Igate. The second current device A2 is connected to the first resistor RINTTo the first resistor RINTProviding a mirror current IINT(ii) a A first resistor RINTAnd the other end of the same is grounded.
The comparison sub-circuit 22 is a comparator. One input terminal of the comparison sub-circuit 22 is connected to the second current source a2 and the first resistor RINTTo switch in a real-time voltage VNTCAnd a reference voltage VrefA comparison is made. According to the following formulae (1) and (2),
VNTC＝INTC×k×RINT(1)
k＝IINT/Igate＝IINT/INTC(2)
if the real-time voltage VNTCGreater than a reference voltage VrefThe power control signal OTP outputted by the comparison sub-circuit 22 becomes a high signal, and triggers the OTP signal to stop the power transistor 1, for example, to turn off the power system, i.e., the flyback converter circuit.
Referring to fig. 5, in other embodiments, the temperature coefficient temperature detection sub-circuit 3 includes a negative temperature coefficient thermistor RNTCAnd a gate pull-down resistor Rg. Negative temperature coefficient thermistor RNTCAnd a gate pull-down resistor RgAre connected in series; the first current device A1 is connected to a gate pull-down resistor RgOne end of (a); negative temperature coefficient thermistor RNTCOne end of which is connected to the gate pull-down resistor RgThe other end of (a); negative temperature coefficient thermistor RNTCAnd the other end of the same is grounded.
In other embodiments, the specific circuit structure of the temperature detection sub-circuit 3 based on the temperature coefficient can also be used for detecting the real-time voltage VNTCWhen the voltage is smaller than the second threshold value, the power supply for supplying power to the power tube 1 is turned off; illustratively, the temperature coefficient temperature detection sub-circuit 3 includes a positive temperature coefficient thermistor, so that the real-time voltageVNTCI.e. becomes smaller as the temperature increases, when the real-time voltage V isNTCWhen the current is less than a certain degree, such as a second threshold value, the power supply for the power tube 1 is turned off; alternatively, the temperature coefficient temperature detection sub-circuit 3 may include a negative temperature coefficient thermistor RNTCBut based on the specific arrangement of the temperature coefficient temperature detection sub-circuit 3, based on the real-time driving of the output current IgateThe obtained real-time voltage VNTCIs smaller with increasing temperature.
In other embodiments, the output current I is driven based on real timegateA signal other than voltage, such as a current signal, is obtained, and it is determined whether the temperature is excessively high based on the signal.
The present embodiment utilizes the driving output pin OUT of the power tube 1 to be multiplexed as the NTC temperature detection circuit. By adding an NTC device (namely a negative temperature coefficient thermistor R) at the driving output pin OUT of the power tube 1NTC) And detecting the driving output current; when the grid voltage of the power tube 1 rises to a steady state, the output current for driving the output pin OUT flows through the NTC device, and the output current I for driving the output pin OUT is detectedgateAccurate temperature detection can be achieved, the power supply system is protected, overall temperature detection of the power supply system can be achieved, and the temperature protection reliability of power supply design can be improved.
Those skilled in the art will appreciate that all or part of the processes of the embodiments methods may be performed by a computer program, which may be stored in a computer-readable storage medium and executed to perform the processes of the embodiments methods. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the invention.
Claims (10)
1. A temperature protection method based on pin multiplexing is characterized by comprising the following steps:
a1, detecting the real-time driving output current of the driving output pin of the control chip through the temperature coefficient temperature detection sub-circuit; the temperature coefficient temperature detection sub-circuit and the grid electrode of the power tube multiplex a driving output pin of the control chip;
a2, if the temperature is judged to be too high based on the real-time driving output current, stopping the power tube from working;
the temperature coefficient temperature detection sub-circuit is at least provided with a temperature coefficient thermistor of which the resistance value changes along with the temperature change; the temperature coefficient thermistor is arranged outside the control chip.
2. The temperature protection method according to claim 1, wherein the a2 specifically comprises: obtaining a real-time voltage based on the real-time drive output current; and if the real-time voltage reaches the specified condition, stopping the power tube from working.
3. The temperature protection method according to claim 2, wherein the obtaining of the real-time voltage based on the real-time driving output current is specifically: and generating a mirror current in a specified proportion to the real-time driving output current, and obtaining real-time voltage according to the mirror current.
4. The temperature protection method according to claim 2, wherein the real-time voltage reaching a specified condition specifically comprises:
the real-time voltage is greater than a first threshold;
alternatively, the real-time voltage is less than a second threshold.
5. The temperature protection method according to claim 1, wherein:
the specific steps of stopping the power tube are as follows: outputting a power supply control signal to close a driving gate terminal of the power tube;
the temperature coefficient thermistor is a negative temperature coefficient thermistor;
the A2 specifically comprises:
and judging that the temperature is too high based on the real-time driving output current, and stopping the power tube.
6. A circuit based on pin multiplexing is characterized by comprising a power tube, a control chip and a temperature coefficient temperature detection sub-circuit; the control chip comprises a signal processing sub-circuit;
the control chip is provided with a driving output pin;
the temperature coefficient temperature detection sub-circuit and the grid electrode of the power tube multiplex a driving output pin of the control chip so as to detect the real-time driving output current of the control chip;
the temperature coefficient temperature detection sub-circuit is at least provided with a temperature coefficient thermistor of which the resistance finger changes along with the temperature change; the temperature coefficient thermistor is arranged outside the control chip;
the signal processing sub-circuit is to: and judging whether the temperature is too high or not based on the real-time driving output current, and if the temperature is too high, stopping the power tube.
7. The pin multiplexing-based circuit of claim 6, wherein the signal processing sub-circuit comprises a comparison sub-circuit and a signal conversion sub-circuit;
the signal conversion sub-circuit is configured to: obtaining a real-time voltage based on the real-time drive output current;
the comparison sub-circuit is configured to: judging whether the real-time voltage reaches a specified condition, if so, outputting a power supply control signal to close a driving grid end of the power tube;
the circuit based on pin multiplexing is a flyback converter circuit.
8. The pin multiplexing-based circuit of claim 7, wherein the signal conversion sub-circuit comprises a current device and a first resistor RINT；
The current device is used for: generating a mirror current in a prescribed proportion to the real-time driving output current and inputting the mirror current to the first resistor RINT；
The current devices include a first current device A1 and a second current device A2 that are current proportional; the first current device A1 is used for detecting the real-time driving output current flowing through the temperature coefficient temperature detection sub-circuit; the second current device A2 is used for generating a mirror current according to the current detected by the first current device in a specified proportion and inputting the mirror current to the first resistor RINT。
9. The pin multiplexing based circuit of claim 8,
the temperature coefficient temperature detection sub-circuit is a negative temperature coefficient thermistor RNTC(ii) a The negative temperature coefficient thermistor RNTCOne end of the power tube is arranged on a line that the grid electrode of the power tube is connected to the driving output pin of the control chip; the negative temperature coefficient thermistor RNTCThe other end of the first and second electrodes is grounded; the first current device A1 is connected to the negative temperature coefficient thermistor RNTCOne end of (a); the second current device A2 is connected to the first resistor RINTOne end of (a); the first resistor RINTThe other end of the first and second electrodes is grounded;
or the temperature coefficient temperature detection sub-circuit comprises a negative temperature coefficient thermistor RNTCAnd a gate pull-down resistor Rg(ii) a The negative temperature coefficient thermistor RNTCAnd the gate pull-down resistor RgAre connected in series; the first current device A1 is connected to the gate pull-down resistor RgOne end of (a); the negative temperature coefficient thermistor RNTCOne end of which is connected to the gate pull-down resistor RgThe other end of (a); the above-mentionedNegative temperature coefficient thermistor RNTCAnd the other end of the same is grounded.
10. A computer-readable storage medium, comprising: the computer-readable storage medium has stored therein program instructions which, when executed by a processor of a computer, cause the processor to carry out the method according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010591416.0A CN111799761A (en) | 2020-06-24 | 2020-06-24 | Temperature protection method and circuit based on pin multiplexing |
| PCT/CN2020/140958 WO2021073663A2 (en) | 2020-06-24 | 2020-12-29 | Pin multiplexing-based temperature protection method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010591416.0A CN111799761A (en) | 2020-06-24 | 2020-06-24 | Temperature protection method and circuit based on pin multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021073663A3 (en) * | 2020-06-24 | 2021-06-10 | 华源智信半导体(深圳)有限公司 | Pin multiplexing-based temperature protection method and circuit |
| CN113933685A (en) * | 2021-09-29 | 2022-01-14 | 广东汇芯半导体有限公司 | Method, apparatus, device and storage medium for detecting overheat of semiconductor circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114123830A (en) * | 2021-10-29 | 2022-03-01 | 广东汇芯半导体有限公司 | Semiconductor circuit having a plurality of transistors |
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| Publication number | Publication date |
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| WO2021073663A3 (en) | 2021-06-10 |
| WO2021073663A2 (en) | 2021-04-22 |
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