CN111490526A - Temperature detection control device and method for synchronous rectification chip - Google Patents
Temperature detection control device and method for synchronous rectification chip Download PDFInfo
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- CN111490526A CN111490526A CN202010442067.6A CN202010442067A CN111490526A CN 111490526 A CN111490526 A CN 111490526A CN 202010442067 A CN202010442067 A CN 202010442067A CN 111490526 A CN111490526 A CN 111490526A
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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
- H02H7/122—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 inverters, i.e. dc/ac converters
- H02H7/1225—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 inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
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Abstract
The invention discloses a temperature detection control device and a temperature detection control method for a synchronous rectification chip, wherein the device comprises a temperature detection module and an integrated control module; the temperature detection module is used for sampling the temperature of the synchronous rectification chip and converting the temperature into an electric signal; the integrated control module is used for controlling the time sequence detection module to stop time sequence detection and controlling the power tube driving module to stop power driving when the temperature of the synchronous rectification chip is abnormal, and simultaneously, outputting a signal to a peripheral feedback unit of the whole machine through the output voltage port CON to reduce the output voltage, so that the load power of the whole machine under the condition of abnormal temperature of the synchronous rectification chip can be effectively reduced, and the reliability and the safety of a power supply system are ensured.
Description
Technical Field
The invention relates to the technical field of microelectronic detection, in particular to a temperature detection control device and method for a synchronous rectification chip.
Background
The synchronous rectification technology is a new technology which adopts a special power MOSFET with extremely low on-state resistance to replace a Schottky diode so as to reduce the rectification loss. The chip of mainstream in the existing market generally has an over-temperature protection function, when the temperature is too high, the driving of the synchronous rectification chip is stopped, and when the abnormity is relieved, the synchronous time sequence detection function is normally started. In fact, when the detected temperature is too high, only the timing sequence detection and driving are turned off, however, the primary main control chip does not know that the temperature of the chip on the secondary side is high, the output voltage still exists, and the load still works, at this time, the body diode of the power tube inside the synchronous rectification chip can replace the power MOSFET to continue working, the current capacity of the body diode is limited and cannot be disconnected, and the body diode can be burned out finally along with the rise of the temperature, even a fire hazard can be caused under a severe environment, and a serious potential safety hazard exists. The above problems are urgently needed to be solved.
Disclosure of Invention
The present invention is directed to a device and a method for detecting and controlling the temperature of a synchronous rectification chip, which solve the problems mentioned in the background section above.
In order to achieve the purpose, the invention adopts the following technical scheme:
a temperature detection control device for a synchronous rectification chip comprises a temperature detection module and an integrated control module; the temperature detection module is connected with the integrated control module and is used for sampling the temperature of the synchronous rectification chip and converting the temperature into an electric signal; the integrated control module is connected with the time sequence detection module and is used for controlling the time sequence detection module to stop time sequence detection when the temperature of the synchronous rectification chip is abnormal; the integrated control module is connected with the power tube driving module and is used for controlling the power tube driving module to stop power driving when the temperature of the synchronous rectification chip is abnormal; the integrated control module is further used for outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON to reduce the output voltage when the temperature of the synchronous rectification chip is abnormal.
Particularly, the synchronous rectification chip temperature detection control device further comprises a reference voltage generating circuit and a comparator; the reference voltage generating circuit is used for generating stable band-gap reference voltages VREF1 and VREF2 when the voltage reaches the working voltage of the synchronous rectification chip; the input end of the comparator is connected with the output end of the temperature detection module and used for comparing a synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard, and outputting a high level in an overturning manner when the comparison result is that the temperature of the synchronous rectification chip is abnormal, the output end of the comparator is connected with the integrated control module, the integrated control module receives the high level and then controls the time sequence detection module to stop time sequence detection and the power tube driving module to stop power driving, and meanwhile, the output voltage port CON of the integrated control module outputs a signal to the peripheral feedback unit of the whole machine to reduce the output voltage.
In particular, the temperature detection control device of the synchronous rectification chip further comprises a hysteresis generation circuit; the hysteresis generating circuit is connected with the comparator and used for generating current values with different sizes and dynamically changing the threshold voltage of the comparator when the normal working temperature and the abnormal temperature of the synchronous rectification chip are detected.
In particular, the integrated control module is specifically configured to output a signal to the R terminal or the feedback port of the overall peripheral feedback unit T L431 through the output voltage port CON to reduce the output voltage when the temperature of the synchronous rectification chip is abnormal.
In particular, the temperature detection module samples the temperature of the synchronous rectification chip based on the temperature characteristics of the PN junction or the temperature sensing device.
Based on the synchronous rectification chip temperature detection control device, the invention also discloses a synchronous rectification chip temperature detection control method, which comprises the following steps:
s101, a temperature detection module samples the temperature of a synchronous rectification chip and converts the temperature into an electric signal;
s102, when the temperature of the synchronous rectification chip is abnormal, the integrated control module controls the time sequence detection module to stop time sequence detection and controls the power tube driving module to stop power driving, and meanwhile, the output voltage is reduced by outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON.
Specifically, the step S101 specifically includes:
s1011, generating stable band-gap reference voltages VREF1 and VREF2 by the reference voltage generating circuit when the voltage reaches the working voltage of the synchronous rectification chip;
s1012, the comparator compares the temperature signal of the synchronous rectification chip output by the temperature detection module with an abnormal temperature reference standard, and when the comparison result is that the temperature of the synchronous rectification chip is abnormal, the comparator outputs a high level to the integrated control module in a turnover mode; the temperature detection module samples the temperature of the synchronous rectification chip based on the temperature characteristics of the PN junction or the temperature sensing device.
Specifically, the step S102 specifically includes that the integrated control module, when receiving the high level output by the comparator, controls the timing detection module to stop timing detection, controls the power tube driving module to stop power driving, and simultaneously outputs a signal to the R terminal or the feedback port of the peripheral feedback unit T L431 of the whole machine through the output voltage port CON to reduce the output voltage.
Particularly, the abnormal temperature reference is adjusted by a program burning method.
In particular, the synchronous rectification chip temperature detection control method further comprises the following steps: the hysteresis generating circuit connected with the comparator generates current values with different sizes when the synchronous rectification chip works normally and the temperature is abnormal, and the threshold voltage of the comparator is dynamically changed.
The device and the method for detecting and controlling the temperature of the synchronous rectification chip have the advantages that: when the temperature of the synchronous rectifier chip is abnormal, controlling a time sequence detection module to stop time sequence detection and controlling a power tube driving module to stop power driving, and simultaneously outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON to reduce the output voltage, wherein the output voltage can be reduced to be close to 0V, so that the load power of the whole machine under the condition of abnormal temperature of the synchronous rectifier chip can be effectively reduced, and the reliability and safety of a power supply system are ensured; and secondly, the abnormal temperature reference datum, namely the over-temperature point of the internal temperature of the synchronous rectification chip, can be selected, the temperature control point can be conveniently adjusted through a program burning mode, and the device is high in practicability and low in cost. And thirdly, when the synchronous rectification chip works normally and the temperature is abnormal, the hysteresis generating circuit connected with the comparator generates current values with different sizes, and the threshold voltage of the comparator is dynamically changed, so that the power device can be prevented from frequently acting at a turning point.
Drawings
Fig. 1 is a block diagram of a structure of a temperature detection control device for a synchronous rectification chip according to an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of a synchronous rectification chip temperature detection control device according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of the output voltage port CON and the peripheral feedback unit of the whole device according to the embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a block diagram of a synchronous rectification chip temperature detection control device according to an embodiment of the present invention.
The temperature detection control device for the synchronous rectification chip in the embodiment specifically includes a temperature detection module 101 and an integrated control module 102.
The temperature detection module 101 is connected to the integrated control module 102, and is configured to sample the temperature of the synchronous rectification chip 103 and convert the temperature into an electrical signal. Specifically, in this embodiment, the temperature detection module 101 samples the temperature of the synchronous rectification chip 103 based on the temperature characteristics of the PN junction or the temperature sensing device, and converts the temperature variation signal into one or more electrical signals.
The integrated control module 102 is connected to the timing detection module 104, and is configured to control the timing detection module 104 to stop timing detection when the temperature of the synchronous rectification chip 103 is abnormal. The integrated control module 102 is connected to the power tube driving module 105, and is configured to control the power tube driving module 105 to stop power driving when the temperature of the synchronous rectification chip 103 is abnormal; the integrated control module 102 is further configured to output a signal to the whole peripheral feedback unit 107 through the output voltage port CON106 to reduce the output voltage when the temperature of the synchronous rectification chip 103 is abnormal.
Specifically, as shown in fig. 2, the temperature detection control device of the synchronous rectification chip in the present embodiment further includes a reference voltage generation circuit and a comparator. The reference voltage generation circuit is used for generating stable band-gap reference voltages VREF1 and VREF2 when the voltage reaches the working voltage of the synchronous rectification chip 103. The input end of the comparator is connected with the output end of the temperature detection module 101, and is configured to compare the temperature signal of the synchronous rectification chip 103 output by the temperature detection module 101 with an abnormal temperature reference (i.e., a bandgap reference voltage VREF1), and flip and output a high level when the comparison result is that the temperature of the synchronous rectification chip 103 is abnormal, the output end of the comparator is connected with the integrated control module 102, and after receiving the high level, the integrated control module 102 controls the timing detection module 104 to stop timing detection and controls the power tube driving module 105 to stop power driving, and simultaneously outputs a signal to the peripheral feedback unit 107 of the whole machine through the output voltage port CON106 to reduce the output voltage. It should be noted that, in this embodiment, the synchronous rectification chip temperature detection control apparatus further includes a hysteresis generation circuit (see U3 in fig. 3); the hysteresis generating circuit is connected with the comparator and is used for generating current values with different sizes and dynamically changing the threshold voltage of the comparator when the synchronous rectification chip 103 works normally and the temperature is abnormal. In addition, in the embodiment, the abnormal temperature reference (the bandgap reference voltage VREF1), that is, the over-temperature point of the internal temperature of the synchronous rectification chip 103, is selectable, and the temperature control point can be conveniently adjusted through a program burning method, so that the practicability is high, and the cost is low.
Specifically, as shown in fig. 3, in the embodiment, the integrated control module 102 is specifically configured to output a signal to an R terminal or a feedback port of the peripheral feedback unit T L431 of the whole machine through the output voltage port CON106 to reduce the output voltage when the temperature of the synchronous rectification chip 103 is abnormal, so as to achieve the purpose of reducing the output voltage and greatly reducing the load power, and the system safety of the power supply system is well guaranteed.
The following briefly introduces the operation timing of the synchronous rectification chip 103 in this embodiment: the whole machine is powered on, the synchronous rectification chip 103 supplies power for charging a capacitor, when the voltage reaches the working voltage of the chip, a stable band gap reference voltage VREF1 and VREF2 is generated by a reference voltage generating circuit (band gap reference voltage generating circuit), the timing detection module 104 works, a driving signal generated by timing control is used for controlling the switching of a power tube, the working loss of the power tube generates heat, the temperature detection module 101 converts a temperature change signal into an electric signal based on the sampling of the temperature characteristic of a PN junction or a temperature sensing device, the electric signal is sent to the input end of a comparator to be compared with an abnormal temperature reference, the comparator overturns to output a high level when the temperature is abnormal, the output end of the comparator is connected with the integrated control module 102, the integrated control module 102 receives the high level and then controls the timing detection module 104 to stop timing detection and the power tube driving module 105 to stop power driving, and simultaneously outputs a signal to the peripheral feedback unit 107 through the output voltage port, the output voltage can be reduced to be close to 0V, the load power of the whole machine under the condition of abnormal temperature of the synchronous rectification chip 103 can be effectively reduced, and the reliability and the safety of a power supply system are ensured.
Based on the synchronous rectification chip temperature detection control device provided by the above embodiment, the embodiment also discloses a synchronous rectification chip temperature detection control method, which includes:
s101, the temperature detection module samples the temperature of the synchronous rectification chip and converts the temperature into an electric signal. Specifically, in this embodiment, the temperature detection module samples the temperature of the synchronous rectification chip based on the temperature characteristics of the PN junction or the temperature sensing device, and converts the temperature variation signal into one or more electrical signals.
S102, when the temperature of the synchronous rectification chip is abnormal, the integrated control module controls the time sequence detection module to stop time sequence detection and controls the power tube driving module to stop power driving, and meanwhile, the output voltage is reduced by outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON.
Specifically, in this embodiment, the step S101 specifically includes:
s1011, the reference voltage generating circuit generates stable band-gap reference voltages VREF1 and VREF2 when the voltage reaches the working voltage of the synchronous rectification chip. S1012, the comparator compares the temperature signal of the synchronous rectification chip output by the temperature detection module with an abnormal temperature reference standard, and when the comparison result is that the temperature of the synchronous rectification chip is abnormal, the comparator outputs a high level to the integrated control module in a turnover mode; the temperature detection module samples the temperature of the synchronous rectification chip based on the temperature characteristics of the PN junction or the temperature sensing device and converts the temperature change signal into one or more electric signals. In this embodiment, the abnormal temperature reference, that is, the over-temperature point of the internal temperature of the synchronous rectification chip, is selectable, and the temperature control point can be conveniently adjusted through a program burning mode, so that the practicability is high, and the cost is low.
Specifically, in this embodiment, the step S102 specifically includes that the integrated control module controls the timing detection module to stop timing detection and controls the power tube driving module to stop power driving when receiving the high level output by the comparator, and simultaneously, the integrated control module outputs a signal to the R terminal or the feedback port of the peripheral feedback unit T L431 of the whole device through the output voltage port CON to reduce the output voltage.
Specifically, in this embodiment, the method for detecting and controlling the temperature of the synchronous rectification chip further includes: the hysteresis generating circuit connected with the comparator generates current values with different sizes when the synchronous rectification chip works normally and the temperature is abnormal, and the threshold voltage of the comparator is dynamically changed, so that the power device can be prevented from frequently acting at a turning point.
According to the technical scheme, under the condition that the temperature of the synchronous rectification chip is abnormal, the integrated control module firstly controls the cut-off time sequence detection and the power driving, and more importantly, the integrated control module outputs a high level to the peripheral feedback unit of the whole machine through the output voltage port CON to control the feedback control end of the whole machine, so that the power of the whole machine is reduced, and the safety of the system is well guaranteed. The invention solves the problem of passive protection of OTP (over temperature protection) temperature protection in the prior art, can protect a chip and adjust and reduce load power, and avoids the occurrence of potential safety hazard.
It will be understood by those skilled in the art that all or part of the above embodiments may be implemented by the computer program to instruct the relevant hardware, and the program may be stored in a computer readable storage medium, and when executed, may include the procedures of the embodiments of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory or a random access memory.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A temperature detection control device for a synchronous rectification chip is characterized by comprising a temperature detection module and an integrated control module; the temperature detection module is connected with the integrated control module and is used for sampling the temperature of the synchronous rectification chip and converting the temperature into an electric signal; the integrated control module is connected with the time sequence detection module and is used for controlling the time sequence detection module to stop time sequence detection when the temperature of the synchronous rectification chip is abnormal; the integrated control module is connected with the power tube driving module and is used for controlling the power tube driving module to stop power driving when the temperature of the synchronous rectification chip is abnormal; the integrated control module is further used for outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON to reduce the output voltage when the temperature of the synchronous rectification chip is abnormal.
2. The synchronous rectification chip temperature detection control device according to claim 1, further comprising a reference voltage generating circuit and a comparator; the reference voltage generating circuit is used for generating stable band-gap reference voltages VREF1 and VREF2 when the voltage reaches the working voltage of the synchronous rectification chip; the input end of the comparator is connected with the output end of the temperature detection module and used for comparing a synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard, and outputting a high level in an overturning manner when the comparison result is that the temperature of the synchronous rectification chip is abnormal, the output end of the comparator is connected with the integrated control module, the integrated control module receives the high level and then controls the time sequence detection module to stop time sequence detection and the power tube driving module to stop power driving, and meanwhile, the output voltage port CON of the integrated control module outputs a signal to the peripheral feedback unit of the whole machine to reduce the output voltage.
3. The temperature detection and control device for the synchronous rectification chip according to claim 2, further comprising a hysteresis generation circuit; the hysteresis generating circuit is connected with the comparator and used for generating current values with different sizes and dynamically changing the threshold voltage of the comparator when the normal working temperature and the abnormal temperature of the synchronous rectification chip are detected.
4. The device as claimed in claim 1, wherein the integrated control module is specifically configured to output a signal to an R terminal or a feedback port of the overall peripheral feedback unit T L431 through an output voltage port CON to reduce the output voltage when the temperature of the synchronous rectification chip is abnormal.
5. The device for detecting and controlling the temperature of the synchronous rectification chip as claimed in one of claims 1 to 4, wherein the temperature detection module samples the temperature of the synchronous rectification chip based on the temperature characteristics of a PN junction or a temperature sensing device.
6. A synchronous rectification chip temperature detection control method based on the synchronous rectification chip temperature detection control device of claim 1, characterized by comprising:
s101, a temperature detection module samples the temperature of a synchronous rectification chip and converts the temperature into an electric signal;
s102, when the temperature of the synchronous rectification chip is abnormal, the integrated control module controls the time sequence detection module to stop time sequence detection and controls the power tube driving module to stop power driving, and meanwhile, the output voltage is reduced by outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON.
7. The method for detecting and controlling the temperature of the synchronous rectification chip according to claim 6, wherein the step S101 specifically comprises:
s1011, generating stable band-gap reference voltages VREF1 and VREF2 by the reference voltage generating circuit when the voltage reaches the working voltage of the synchronous rectification chip;
s1012, the comparator compares the temperature signal of the synchronous rectification chip output by the temperature detection module with an abnormal temperature reference standard, and when the comparison result is that the temperature of the synchronous rectification chip is abnormal, the comparator outputs a high level to the integrated control module in a turnover mode; the temperature detection module samples the temperature of the synchronous rectification chip based on the temperature characteristics of the PN junction or the temperature sensing device.
8. The method for detecting and controlling the temperature of the synchronous rectification chip according to claim 7, wherein the step S102 specifically comprises the step of controlling the timing detection module to stop timing detection and the power tube driving module to stop power driving when the integrated control module receives the high level of the comparator flip output, and simultaneously outputting a signal to an R end or a feedback port of a peripheral feedback unit T L431 of the whole machine through an output voltage port CON to reduce the output voltage.
9. The method as claimed in claim 7, wherein the abnormal temperature reference is adjusted by programming.
10. The method for detecting and controlling the temperature of the synchronous rectification chip according to claim 9, further comprising: the hysteresis generating circuit connected with the comparator generates current values with different sizes when the synchronous rectification chip works normally and the temperature is abnormal, and the threshold voltage of the comparator is dynamically changed.
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