CN111490526B - Synchronous rectification chip temperature detection control device and method - Google Patents
Synchronous rectification chip temperature detection control device and method Download PDFInfo
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- CN111490526B CN111490526B CN202010442067.6A CN202010442067A CN111490526B CN 111490526 B CN111490526 B CN 111490526B CN 202010442067 A CN202010442067 A CN 202010442067A CN 111490526 B CN111490526 B CN 111490526B
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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 synchronous rectification chip temperature detection control device and a method, 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 the 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 synchronous rectification chip temperature detection control device and method.
Background
The synchronous rectification technology is a new technology for replacing a Schottky diode by adopting a special power MOSFET with extremely low on-state resistance so as to reduce rectification loss. The chip interior of the mainstream in the market at present is generally provided with an over-temperature protection function, when the temperature is over high, the driving of the synchronous rectification chip is stopped, and after abnormal release, the synchronous time sequence detection function is normally started. In fact, when the temperature is detected to be too high, the time sequence detection and driving are only turned off, however, the primary main control chip does not know that the temperature of the secondary side chip is high, the output voltage still exists, the load still works, at the moment, the body diode of the power tube in the synchronous rectification chip can replace the power MOSFET to continue to work, the current capacity of the body diode is limited and cannot be disconnected, burning out can be finally caused along with the rising of the temperature, even fire disaster can be caused under severe environment, and serious potential safety hazards exist. The above problems are to be solved.
Disclosure of Invention
The present invention is directed to a synchronous rectification chip temperature detection control device and method, which solve the above-mentioned problems in the background art.
To achieve the purpose, the invention adopts the following technical scheme:
a synchronous rectification chip temperature detection control device 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 also used for reducing the output voltage by outputting a signal to the peripheral feedback unit of the whole machine through the output voltage port CON when the temperature of the synchronous rectification chip is abnormal.
In particular, the synchronous rectification chip temperature detection control device also comprises a reference voltage generation 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 is used for comparing the synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard, when the comparison result is that the synchronous rectification chip temperature is abnormal, the output end of the comparator is connected with the integrated control module, the integrated control module controls the time sequence detection module to stop time sequence detection after receiving the high level and controls the power tube driving module to stop power driving, and meanwhile, the output voltage port CON outputs a signal to the peripheral feedback unit of the whole machine to reduce the output voltage.
Particularly, the synchronous rectification chip temperature detection control device also comprises a hysteresis generation circuit; the hysteresis generating circuit is connected with the comparator and is used for generating current values with different magnitudes when the normal working temperature and the abnormal temperature of the synchronous rectification chip are caused, and dynamically changing the threshold voltage of the comparator.
Particularly, the integrated control module is specifically configured to reduce the output voltage by outputting a signal from the output voltage port CON to the R end or the feedback port of the peripheral feedback unit TL431 of the whole machine 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 PN junction or the temperature characteristic of 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, sampling the temperature of a synchronous rectification chip by a temperature detection module, and converting 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, controls the power tube driving module to stop power driving, and simultaneously outputs a signal to the peripheral feedback unit of the whole machine through the output voltage port CON to reduce the output voltage.
In particular, 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, comparing the synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard by the comparator, and turning over and outputting a high level to the integrated control module when the comparison result is that the temperature of the synchronous rectification chip is abnormal; 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.
In particular, the step S102 specifically includes: when the integrated control module receives the high level output by the comparator in a turnover way, the time sequence detection module is controlled to stop time sequence detection, the power tube driving module is controlled to stop power driving, and meanwhile, an output voltage port CON outputs a signal to an R end or a feedback port of a whole peripheral feedback unit TL431 to reduce the output voltage.
In particular, the abnormal temperature reference standard is adjusted by a program burning mode.
In particular, the synchronous rectification chip temperature detection control method further comprises the following steps: and the hysteresis generating circuit connected with the comparator generates current values with different magnitudes when the normal working temperature and the temperature of the synchronous rectification chip are abnormal, and dynamically changes the threshold voltage of the comparator.
The synchronous rectification chip temperature detection control device and method provided by the invention have the advantages that: 1. when the temperature of the synchronous rectification chip is abnormal, the control time sequence detection module stops time sequence detection, the power tube driving module is controlled to stop power driving, meanwhile, the output voltage is reduced by outputting a signal to the peripheral feedback unit of the whole machine through the output voltage port CON, the output voltage is reduced to be close to 0V, 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; 2. the abnormal temperature reference standard, namely the over-temperature point of the internal temperature of the synchronous rectification chip, can be selected, and the temperature control point can be conveniently adjusted in a program burning mode, so that the practicability is strong, and the cost is low. 3. The hysteresis generating circuit connected with the comparator generates current values with different magnitudes when the normal working temperature and the temperature of the synchronous rectification chip are abnormal, dynamically changes the threshold voltage of the comparator, and can avoid frequent actions of the power device at the turning point.
Drawings
FIG. 1 is a block diagram of a synchronous rectification chip temperature detection control device according to an embodiment of the present invention;
fig. 2 is a schematic circuit 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 machine according to the embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended 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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a block diagram illustrating a temperature detection control device for a synchronous rectification chip according to an embodiment of the invention.
The synchronous rectification chip temperature detection control device in this embodiment specifically includes a temperature detection module 101 and an integrated control module 102.
The temperature detection module 101 is connected with the integrated control module 102, and is used for sampling the temperature of the synchronous rectification chip 103 and converting the temperature into an electric signal. Specifically, in this embodiment, the temperature detection module 101 samples the temperature of the synchronous rectification chip 103 based on the temperature characteristic of the PN junction or the temperature sensor, and converts the temperature change 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 with the power tube driving module 105, and is used for controlling 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 reduce the output voltage by outputting a signal to the peripheral feedback unit 107 of the complete machine through the output voltage port CON106 when the temperature of the synchronous rectification chip 103 is abnormal.
Specifically, as shown in fig. 2, the synchronous rectification chip temperature detection control device in this embodiment further includes 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 103. The input end of the comparator is connected with the output end of the temperature detection module 101, and is used for comparing the temperature signal of the synchronous rectification chip 103 output by the temperature detection module 101 with an abnormal temperature reference standard (namely, a band gap reference voltage VREF 1), turning over and outputting 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 the integrated control module 102 controls the time sequence detection module 104 to stop time sequence detection after receiving the high level, 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 device further includes a hysteresis generating circuit (see U3 in fig. 3 below); the hysteresis generating circuit is connected with the comparator and is used for generating current values with different magnitudes when the synchronous rectification chip 103 works at normal temperature and the temperature is abnormal, and dynamically changing the threshold voltage of the comparator. In addition, in this embodiment, the abnormal temperature reference (bandgap reference voltage VREF 1), 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 by a program burning mode, so that the practicality is strong and the cost is low.
Specifically, as shown in fig. 3, in this embodiment, the integrated control module 102 is specifically configured to reduce the output voltage by outputting a signal to the R end or the feedback port of the peripheral feedback unit TL431 of the whole machine through the output voltage port CON106 when the temperature of the synchronous rectification chip 103 is abnormal, so as to achieve the purposes of reducing the output voltage and greatly reducing the load power, and the system safety of the power supply system is well ensured.
The following description is given of the operation timing of the synchronous rectification chip 103 in this embodiment as follows: when the voltage reaches the chip working voltage, stable band-gap reference voltages VREF1 and VREF2 are generated by a reference voltage generating circuit (band-gap reference voltage generating circuit), a time sequence detecting module 104 works, the generated driving signals are controlled according to time sequence to control the switch of a power tube, the working loss of the power tube generates heat, a temperature detecting module 101 converts a temperature change signal into an electric signal based on the sampling of the temperature characteristics of a PN junction or a temperature sensing device, the electric signal is sent to an 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 an integrated control module 102, the integrated control module 102 controls the time sequence detecting module 104 to stop time sequence detection and controls a power tube driving module 105 to stop power driving, meanwhile, the output voltage is reduced by outputting a signal to a peripheral feedback unit 107 through an output voltage port CON106, the load power of the whole machine can be effectively reduced by 0V, and the reliability and safety of a power supply system are ensured under the condition that the temperature of the synchronous rectifying chip 103 is abnormal.
Based on the synchronous rectification chip temperature detection control device provided in the above embodiment, the present embodiment also discloses a synchronous rectification chip temperature detection control method, which includes:
s101, sampling the temperature of the synchronous rectification chip by the temperature detection module, and converting 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 characteristic of the PN junction or the temperature sensing device, and converts the temperature change 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, controls the power tube driving module to stop power driving, and simultaneously outputs a signal to the peripheral feedback unit of the whole machine through the output voltage port CON to reduce the output voltage.
Specifically, in this embodiment, the step S101 specifically includes:
s1011, when the voltage reaches the working voltage of the synchronous rectification chip, the reference voltage generating circuit generates stable band-gap reference voltages VREF1 and VREF2. S1012, comparing the synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard by the comparator, and turning over and outputting a high level to the integrated control module when the comparison result is that the temperature of the synchronous rectification chip is abnormal; 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 in a program burning manner, so that the practicality is strong and the cost is low.
Specifically, in this embodiment, the step S102 specifically includes: when the integrated control module receives the high level output by the comparator in a turnover way, the time sequence detection module is controlled to stop time sequence detection, the power tube driving module is controlled to stop power driving, and meanwhile, an output voltage port CON outputs a signal to an R end or a feedback port of a whole peripheral feedback unit TL431 to reduce the output voltage.
Specifically, in this embodiment, the synchronous rectification chip temperature detection control method further includes: the hysteresis generating circuit connected with the comparator generates current values with different magnitudes when the normal working temperature and the temperature of the synchronous rectification chip are abnormal, dynamically changes the threshold voltage of the comparator, and can avoid frequent actions of the power device at the 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 output voltage port CON outputs high level to the peripheral feedback unit of the whole machine 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 ensured. The invention solves the problem of passive protection of OTP (over temp protection, over-temperature protection) temperature protection in the prior art, not only can protect the chip, but also can regulate and reduce the load power, and avoid the occurrence of application potential safety hazard.
Those skilled in the art will appreciate that implementing all or part of the above embodiments may be accomplished by way of computer programs, stored on a computer readable storage medium, which when executed may comprise the flow of embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory, a random access memory, or the like.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. The synchronous rectification chip temperature detection control device 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 also used for reducing output voltage by outputting a signal to a peripheral feedback unit of the whole machine through an output voltage port CON when a body diode in the synchronous rectification chip replaces a power MOSFET to continuously work and causes abnormal temperature;
the integrated control module is specifically configured to reduce the output voltage by outputting a signal from the output voltage port CON to the R end or the feedback port of the peripheral feedback unit TL431 of the whole machine when the temperature of the synchronous rectification chip is abnormal.
2. The synchronous rectification chip temperature detecting and controlling device as claimed in 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 is used for comparing the synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard, when the comparison result is that the synchronous rectification chip temperature is abnormal, the output end of the comparator is connected with the integrated control module, the integrated control module controls the time sequence detection module to stop time sequence detection after receiving the high level and controls the power tube driving module to stop power driving, and meanwhile, the output voltage port CON outputs a signal to the peripheral feedback unit of the whole machine to reduce the output voltage.
3. The synchronous rectification chip temperature detecting and controlling device according to claim 2, further comprising a hysteresis generating circuit; the hysteresis generating circuit is connected with the comparator and is used for generating current values with different magnitudes when the normal working temperature and the abnormal temperature of the synchronous rectification chip are caused, and dynamically changing the threshold voltage of the comparator.
4. A synchronous rectification chip temperature detection control apparatus according to any one of claims 1 to 3, wherein said 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.
5. A synchronous rectification chip temperature detection control method based on the synchronous rectification chip temperature detection control device of claim 1, characterized in that the method comprises the following steps:
s101, sampling the temperature of a synchronous rectification chip by a temperature detection module, and converting 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, after the power MOSFET stops working, a body diode in the synchronous rectification chip replaces the power MOSFET to continuously work, so that the temperature continuously rises, and at the moment, an output voltage port CON outputs a signal to a peripheral feedback unit of the whole machine to reduce the output voltage; when the integrated control module receives the high level of the turnover output of the comparator, the time sequence detection module is controlled to stop time sequence detection, the power tube driving module is controlled to stop power driving, and meanwhile, the output voltage is reduced by outputting a signal to the R end or the feedback port of the whole peripheral feedback unit TL431 through the output voltage port CON.
6. The synchronous rectification chip temperature detecting and controlling method as claimed in claim 5, wherein said 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, comparing the synchronous rectification chip temperature signal output by the temperature detection module with an abnormal temperature reference standard by the comparator, and turning over and outputting a high level to the integrated control module when the comparison result is that the temperature of the synchronous rectification chip is abnormal; 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.
7. The synchronous rectification chip temperature detecting and controlling method as claimed in claim 6, wherein said abnormal temperature reference is adjusted by a program burning mode.
8. The synchronous rectification chip temperature detecting and controlling method as claimed in claim 7, further comprising: and the hysteresis generating circuit connected with the comparator generates current values with different magnitudes when the normal working temperature and the temperature of the synchronous rectification chip are abnormal, and dynamically changes the threshold voltage of the comparator.
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