CN217469443U - Overtemperature and derating protection circuit for switching power supply - Google Patents
Overtemperature and derating protection circuit for switching power supply Download PDFInfo
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Abstract
The utility model belongs to the technical field of control circuit, concretely relates to excess temperature derating protection circuit for switching power supply, this excess temperature derating protection circuit for switching power supply includes: the device comprises a resistance voltage division unit, a reference voltage stabilization unit, a derating unit and an LLC circuit control IC for controlling an LLC conversion circuit of the switching power supply; when the temperature of the switching power supply is between a first limit temperature point and a second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit, and the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC to control derating output of the switching power supply; and when the temperature of the switching power supply is higher than the second limit temperature point, controlling the switching power supply to stop outputting; the utility model discloses can fall the volume output automatically when switching power supply temperature risees to first limit value temperature point, self-closing output carries out the excess temperature protection behind the second limit temperature point, can reduce the product and appear the overheated black screen condition in the display screen power supply is used, reduces the customer complaint condition that leads to the black screen to arouse because of the power excess temperature.
Description
Technical Field
The utility model belongs to the technical field of control circuit, concretely relates to excess temperature volume of falling protection circuit for switching power supply.
Background
The over-temperature protection circuit of the switching power supply is used for performing protection action when the detected power supply temperature reaches a certain limit value so as to prevent the power supply from being damaged due to over-temperature and incapable of working normally.
The conventional switching power supply usually adopts a temperature control switch or a thermistor and the like to realize over-temperature turn-off protection, however, the protection is easy to cause display screen blackout in the application of a display screen power supply.
Therefore, it is desirable to develop a new over-temperature and derating protection circuit for a switching power supply to solve the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a switching power supply is with excess temperature volume protection circuit that falls to solve and how to fall the problem of volume protection circuit when the excess temperature.
In order to solve the technical problem, the utility model provides a switching power supply is with excessive temperature drop amount protection circuit which includes: the device comprises a resistance voltage division unit, a reference voltage stabilization unit, a derating unit and an LLC circuit control IC connected with a switching power supply in sequence; the resistance voltage division unit is suitable for collecting the temperature of the switching power supply, and the divided voltage of the resistance voltage division unit changes along with the temperature of the switching power supply; when the temperature of the switching power supply is between a first limit temperature point and a second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit according to the divided voltage of the resistance voltage dividing unit, so that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC, namely the LLC circuit control IC controls derating output of the switching power supply according to the voltage control signal; and when the temperature of the switching power supply is higher than the second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit according to the divided voltage of the resistance voltage dividing unit, so that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC, namely the LLC circuit control IC controls the switching power supply to stop outputting according to the voltage control signal.
In one embodiment, the resistance voltage dividing unit includes: the thermistor comprises a thermistor body, a first resistor and a second resistor; the thermistor is connected to the switching power supply to be used for collecting the temperature of the switching power supply; the thermistor, the first resistor and the second resistor which are connected in series are connected with the reference voltage stabilizing unit, and the level signal output by the reference voltage stabilizing unit is reduced along with the temperature rise of the switching power supply.
In one embodiment, the reference voltage stabilization unit includes: a controllable reference voltage regulator; and the controllable reference voltage stabilizing source outputs a corresponding level signal to the derating unit according to the divided voltage of the resistance voltage dividing unit.
In one embodiment, the derating unit comprises: the fifth resistor, the triode, the second diode, the seventh resistor and the first capacitor; when the temperature of the switching power supply is lower than a first limit temperature point, the controllable reference voltage-stabilizing source controls the triode to be cut off, so that an external auxiliary direct-current voltage signal is output to the LLC circuit control IC through the fifth resistor, the triode, the second diode, the seventh resistor and the first capacitor, namely the LLC circuit control IC controls the switching power supply to normally work.
In one embodiment, when the temperature of the switching power supply is between a first limit temperature point and a second limit temperature point, the level signal output by the controllable reference voltage regulator falls, the triode works in the amplification region, so that an external auxiliary direct-current voltage signal is output to the LLC circuit control IC through the fifth resistor, the triode, the second diode, the seventh resistor and the first capacitor, namely the LLC circuit control IC controls the derating output of the switching power supply.
In one embodiment, when the temperature of the switching power supply is higher than the second temperature limit point, the level signal output by the controllable reference regulator continues to decrease, the base current of the triode increases, and the Ice increases, so that the external auxiliary direct-current voltage signal is output to the LLC circuit control IC through the fifth resistor, the triode, the second diode, the seventh resistor, and the first capacitor, that is, the LLC circuit control IC controls the switching power supply to stop outputting.
In one embodiment, the derating unit further comprises: a return difference circuit; the return difference circuit is connected with the resistance voltage division unit and the triode so as to adapt to the temperature return difference of the switching power supply.
In one embodiment, the return difference circuit includes: the first diode and the sixth resistor are connected in series; the triode works through the first diode and the sixth resistor trigger resistor voltage division unit.
In one embodiment, the LLC circuit control IC includes: l6599 of ST, and the like; taking L6599 as an example, the seventh resistor is connected with a 'DELAY' pin of the IC; the DELAY pin detects a voltage signal of the seventh resistor, namely, the DELAY pin controls the switching power supply to normally work or derate output or stop working.
The beneficial effects of the utility model are that, the utility model discloses a resistance partial pressure unit automated inspection switching power supply temperature, and cooperation benchmark steady voltage unit drive derating unit is controlled LLC circuit control IC, when switching power supply temperature risees to first limit value temperature point, automatic derating output, rise to second limiting temperature point back when switching power supply temperature, the automatic shutdown output carries out the excess temperature protection, can reduce the product and appear the overheated black screen condition occasionally in display screen power supply application, promoted customer and used experience and feel, reduce the customer complaint condition that leads to the black screen to arouse because of the power excess temperature.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of an over-temperature and derating protection circuit for a switching power supply of the present invention.
In the figure:
r1, a first resistor; r2, a second resistor; r3, third resistor; r4, fourth resistor; r5, fifth resistor; r6, sixth resistor; r7, seventh resistor; vk, divided voltage; VDD, an external auxiliary dc voltage signal; u1, a controllable reference voltage regulator; RT1, thermistor; q1, triode; d1, a first diode; d2, a second diode; c1, a first capacitance.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Example 1
In this embodiment, as shown in fig. 1, the present embodiment provides an over-temperature derating protection circuit for a switching power supply, including: the device comprises a resistance voltage division unit, a reference voltage stabilization unit, a derating unit and an LLC circuit control IC connected with a switching power supply in sequence; the resistance voltage dividing unit is suitable for collecting the temperature of the switching power supply, and the divided voltage Vk of the resistance voltage dividing unit changes along with the temperature of the switching power supply; when the temperature of the switching power supply is between a first limit temperature point and a second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit according to the divided voltage Vk of the resistance voltage dividing unit, so that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC, namely the LLC circuit control IC controls derating output of the switching power supply according to the voltage control signal; and when the temperature of the switching power supply is higher than a second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit according to the divided voltage Vk of the resistance voltage dividing unit, so that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC, namely the LLC circuit control IC controls the switching power supply to stop outputting according to the voltage control signal.
In this embodiment, this embodiment passes through resistance partial pressure unit automated inspection switching power supply temperature, and cooperate benchmark steady voltage unit drive derating unit to control LLC circuit control IC, when switching power supply temperature risees to first limit value temperature point, automatic derating output, after switching power supply temperature risees to second limit temperature point, the automatic shutdown output carries out the overtemperature protection, can reduce the product and appear the overheated black screen condition occasionally in display screen power supply application, customer uses the experience and feels has been promoted, reduce the customer complaint condition that leads to the black screen to arouse because of the power overtemperature.
In this embodiment, the resistance voltage dividing unit includes: a thermistor RT1, a first resistor R1, and a second resistor R2; the thermistor RT1 is connected to a switching power supply to be used for collecting the temperature of the switching power supply; the thermistor RT1, the first resistor R1 and the second resistor R2 which are connected in series are connected with a reference voltage stabilizing unit, and the level signal output by the reference voltage stabilizing unit is reduced along with the temperature rise of the switching power supply.
In this embodiment, the thermistor RT1 is a negative temperature coefficient resistor, and since the current of the resistor voltage dividing unit = divided voltage Vk/(the resistance of the thermistor RT1 + the resistance of the first resistor R1 + the resistance of the second resistor R2), and the current of the resistor voltage dividing unit is constant, the resistance of the thermistor RT1 decreases as the temperature of the switching power supply increases, and thus the divided voltage Vk increases as the temperature of the switching power supply increases.
In this embodiment, the reference voltage stabilization unit includes: a controllable reference voltage regulator U1; the controllable reference voltage stabilizing source U1 outputs a corresponding level signal to the derating unit according to the divided voltage Vk of the resistance voltage dividing unit.
In this embodiment, the reference voltage of the controllable reference regulator U1 is Vref (e.g., TL431 reference Vref = 2.5V).
In this embodiment, the derating unit includes: a fifth resistor R5, a triode Q1 (adopting PNP type), a second diode D2, a seventh resistor R7 and a first capacitor C1; when the temperature of the switching power supply is lower than a first limit temperature point, the controllable reference voltage regulator U1 controls the transistor Q1 to be cut off, so that an external auxiliary direct-current voltage signal VDD is output to the LLC circuit control IC through the fifth resistor R5, the transistor Q1, the second diode D2, the seventh resistor R7 and the first capacitor C1, namely the LLC circuit control IC controls the switching power supply to normally work.
In this embodiment, when the temperature of the switching power supply is between the first limit temperature point and the second limit temperature point, the level signal output by the controllable reference regulator U1 decreases, and the transistor Q1 operates in the amplification region, so that the external auxiliary dc voltage signal VDD is output to the LLC circuit control IC through the fifth resistor R5, the transistor Q1, the second diode D2, the seventh resistor R7, and the first capacitor C1, that is, the LLC circuit control IC controls the derating output of the switching power supply.
In this embodiment, when the temperature of the switching power supply is higher than the second limit temperature point, the level signal output by the controllable reference regulator U1 continues to decrease, the base current of the transistor Q1 increases, and Ice increases, so that the external auxiliary dc voltage signal VDD is output to the LLC circuit control IC through the fifth resistor R5, the transistor Q1, the second diode D2, the seventh resistor R7, and the first capacitor C1, that is, the LLC circuit control IC controls the switching power supply to stop outputting.
In this embodiment, the derating unit further includes: a return difference circuit; the return difference circuit is connected with the resistance voltage division unit and the triode Q1 so as to adapt to the temperature return difference of the switching power supply.
In this embodiment, the return difference circuit includes: a first diode D1 and a sixth resistor R6 connected in series; the triode Q1 triggers the resistor voltage dividing unit to work through the first diode D1 and the sixth resistor R6.
In this embodiment, the LLC circuit control IC includes: l6599 is taken as an example, and the seventh resistor is connected with a 'DELAY' pin of the IC; the DELAY pin detects a voltage signal of the seventh resistor, namely, the DELAY pin controls the switching power supply to normally work or derate output or stop working.
In this embodiment, when the temperature of the switching power supply is lower than a first limit temperature point, the divided voltage Vk is lower than Vref, the controllable reference regulator U1 outputs a high level at this time, the transistor Q1 is in a cut-off state, the external auxiliary dc voltage signal VDD passes through the fifth resistor R5, the transistor Q1, the second diode D2 to the seventh resistor R7, and the first capacitor C1, the loop current is reverse cut-off Iceo leakage current of the transistor Q1, and the Iceo leakage current is generally lower than 100nA, so the voltage of the seventh resistor R7 is lower than 0.3V, and at this time, the operation of the switching power supply is not affected; when the temperature of the switching power supply reaches a first limit temperature point, the output level of the controllable reference voltage-stabilizing source U1 begins to fall, the triode Q1 works in an amplification area, the voltage of an external auxiliary direct-current voltage signal VDD starts to rise gradually through a fifth resistor R5, the triode Q1, a second diode D2 to a seventh resistor R7 and a first capacitor C1, the voltage of the two ends of the seventh resistor R7, the working frequency of the circuit begins to rise slowly after the voltage of the point exceeds 0.3V, the frequency rises according to the resonance working principle of the LLC converter, the gain of the output voltage drops, and the output voltage drops; as the output voltage drops, the output power also drops; the derated output is realized; when the temperature of the switching power supply continues to rise, the output level of the controllable reference voltage regulator U1 further drops, the base current of the triode Q1 increases, the Ice of the triode Q1 also increases, the voltage at two ends of the seventh resistor R7 increases, the voltage at the point continues to rise, after the base current rises to 2V, the pin function of the IC is controlled according to the LLC, at the moment, the working frequency reaches the set maximum frequency, and at the moment, the output voltage does not continue to drop; when the temperature of the switching power supply continues to rise, the voltage at the point also continues to rise, and when the temperature rises to the second limit temperature point, the voltage at the point reaches 3.5V, and the LLC converter is driven to be closed and has no output.
In this embodiment, the third resistor R3 and the fourth resistor R4 function as voltage dividers to protect the circuit.
To sum up, the utility model discloses a resistance partial pressure unit automated inspection switching power supply temperature to cooperation benchmark steady voltage unit drive derating unit is controlled LLC circuit control IC, when switching power supply temperature risees to first limit value temperature point, automatic derating output, rise to second limiting temperature point back when switching power supply temperature, the automatic shutdown output carries out the excess temperature protection, can reduce the product and appear the overheated black screen condition occasionally in display screen power supply application, promoted the customer and used the experience and feel, reduce the customer complaint condition that leads to the black screen to arouse because of the power excess temperature.
The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation. Moreover, the software programs referred to in the present application are all prior art, and the present application does not relate to any improvement of the software programs.
In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An over-temperature de-rating protection circuit for a switching power supply, comprising:
the LLC circuit control IC is used for controlling the LLC conversion circuit of the switching power supply; wherein
The resistance voltage division unit is suitable for collecting the temperature of the switching power supply, and the divided voltage of the resistance voltage division unit changes along with the temperature of the switching power supply;
when the temperature of the switching power supply is between a first limit temperature point and a second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit according to the divided voltage of the resistance voltage dividing unit, so that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC, namely that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC
The LLC circuit control IC controls the derating output of the switching power supply according to the voltage control signal; and
when the temperature of the switching power supply is higher than a second limit temperature point, the reference voltage stabilizing unit outputs a corresponding level signal to the derating unit according to the divided voltage of the resistance voltage dividing unit, so that the derating unit outputs a corresponding voltage control signal to the LLC circuit control IC, namely
And the LLC circuit control IC controls the switching power supply to stop outputting according to the voltage control signal.
2. The over-temperature de-rating protection circuit for a switching power supply according to claim 1,
the resistance voltage-dividing unit includes: the thermistor comprises a thermistor, a first resistor and a second resistor;
the thermistor is connected to the switching power supply to be used for collecting the temperature of the switching power supply;
the thermistor, the first resistor and the second resistor which are connected in series are connected with the reference voltage stabilizing unit, and the level signal output by the reference voltage stabilizing unit is reduced along with the temperature rise of the switching power supply.
3. The over-temperature de-rating protection circuit for a switching power supply according to claim 1,
the reference voltage stabilization unit includes: a controllable reference voltage regulator;
and the controllable reference voltage-stabilizing source outputs a corresponding level signal to the derating unit according to the divided voltage of the resistance voltage-dividing unit.
4. The over-temperature de-rating protection circuit for a switching power supply according to claim 3,
the derating unit includes: the third resistor, the triode, the second diode, the third resistor and the second capacitor are connected in series;
when the temperature of the switching power supply is lower than a first limit temperature point, the controllable reference voltage stabilizing source controls the triode to be cut off so that an external auxiliary direct-current voltage signal is output to the LLC circuit control IC through the fifth resistor, the triode, the second diode, the seventh resistor and the first capacitor, namely the LLC circuit control IC
And the LLC circuit controls the IC to control the normal work of the switching power supply.
5. The over-temperature de-rating protection circuit for a switching power supply according to claim 4,
when the temperature of the switching power supply is between a first limit temperature point and a second limit temperature point, the level signal output by the controllable reference voltage-stabilizing source is reduced, the triode works in the amplification area, so that an external auxiliary direct-current voltage signal is output to the LLC circuit control IC through the fifth resistor, the triode, the second diode, the seventh resistor and the first capacitor, namely the LLC circuit control IC is the switching power supply
And the LLC circuit controls the IC to control the derating output of the switching power supply.
6. The over-temperature de-rating protection circuit for a switching power supply according to claim 5,
when the temperature of the switching power supply is higher than a second limit temperature point, the level signal output by the controllable reference voltage stabilizing source continuously decreases, the base current of the triode increases and the Ice increases, so that an external auxiliary direct-current voltage signal is output to the LLC circuit control IC through the fifth resistor, the triode, the second diode, the seventh resistor and the first capacitor, namely the LLC circuit control IC is the switching power supply
The LLC circuit controls the IC to control the switch power supply to stop outputting.
7. The over-temperature de-rating protection circuit for a switching power supply according to claim 5,
the derating unit further comprises: a return difference circuit;
the return difference circuit is connected with the resistance voltage division unit and the triode so as to adapt to the temperature return difference of the switching power supply.
8. The over-temperature de-rating protection circuit for a switching power supply according to claim 7,
the return difference circuit includes: the first diode and the sixth resistor are connected in series;
the triode works through the first diode and the sixth resistor trigger resistor voltage division unit.
9. The over-temperature de-rating protection circuit for a switching power supply according to claim 4,
the LLC circuit control IC includes: l6599 by ST, HR1001 of MPS;
the seventh resistor is connected with a 'DELAY' pin or a 'TIMER' pin of the IC;
the IC pin is adapted to detect a voltage signal of the seventh resistor, i.e.
And controlling the switching power supply to normally work or derate output or stop working.
10. The over-temperature de-rating protection circuit for a switching power supply according to claim 9,
the switching power supply adopts an LLC conversion circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220497261.9U CN217469443U (en) | 2022-03-09 | 2022-03-09 | Overtemperature and derating protection circuit for switching power supply |
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| CN202220497261.9U CN217469443U (en) | 2022-03-09 | 2022-03-09 | Overtemperature and derating protection circuit for switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116722737A (en) * | 2023-08-09 | 2023-09-08 | 东莞市奥源电子科技有限公司 | Control method, system and storage medium for LLC power supply self-adaptive adjustment output |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116722737A (en) * | 2023-08-09 | 2023-09-08 | 东莞市奥源电子科技有限公司 | Control method, system and storage medium for LLC power supply self-adaptive adjustment output |
| CN116722737B (en) * | 2023-08-09 | 2024-03-19 | 东莞市奥源电子科技有限公司 | Control method, system and storage medium for LLC power supply self-adaptive adjustment output |
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