CN110320952B - Over-temperature protection circuit and system - Google Patents
Over-temperature protection circuit and system Download PDFInfo
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- CN110320952B CN110320952B CN201910663317.6A CN201910663317A CN110320952B CN 110320952 B CN110320952 B CN 110320952B CN 201910663317 A CN201910663317 A CN 201910663317A CN 110320952 B CN110320952 B CN 110320952B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses an over-temperature protection circuit and a system, wherein the over-temperature protection circuit comprises: the voltage generation module is configured to set at least one stage of over-temperature protection trigger point voltage, and the trigger point voltage is output through the first output end; the operation module is configured to obtain a reference voltage according to the received at least one-stage trigger point voltage and the feedback voltage, the first input end is electrically connected with the first output end and inputs the at least one-stage trigger point voltage through the first input end, and the feedback voltage is obtained based on the detected temperature of the over-temperature protection circuit; the logic signal generating module is configured to generate logic signals according to the received reference voltage so as to control other devices to work, so that the over-temperature protection circuit provided by the embodiment of the invention has at least one over-temperature protection trigger point, and a current curve can be dynamically regulated and controlled in the process of triggering over-temperature protection, thereby being capable of flexibly adapting to different application environments and meeting the application requirements of products with over-temperature protection requirements under different application environments.
Description
Technical Field
The present invention relates to the field of circuit technologies, and in particular, to an over-temperature protection circuit and system.
Background
Over-temperature protection is an important protection function in circuit application, and products with over-temperature protection requirements can design corresponding over-temperature protection circuits.
The existing over-temperature protection circuit has an over-temperature protection trigger point, which comprises a temperature detection module. When the working temperature of the circuit reaches the over-temperature protection trigger point, an over-temperature protection mechanism is started or triggered, so that an over-temperature protection signal or instruction is sent out, and the product can select a current limiting mode or a system closing mode to carry out limiting protection according to the over-temperature protection signal or instruction.
However, the over-temperature protection trigger point in the existing over-temperature protection circuit is usually fixed and single in the circuit, and under the condition of having the fixed and single over-temperature protection trigger point, when the application environments of the product are different, the working modes or protection modes of the product in different application environments cannot be distinguished and identified, and the application requirements of the product in different application environments cannot be met.
Disclosure of Invention
The embodiment of the invention provides an over-temperature protection circuit and a system, which are used for solving the problem that the existing over-temperature protection circuit cannot meet the application requirements of products in different application environments.
The embodiment of the invention adopts the following technical scheme:
In a first aspect, the present invention provides an over-temperature protection circuit comprising:
The voltage generation module is configured to set at least one stage of over-temperature protection trigger point voltage, is provided with at least one first output end and outputs the trigger point voltage through the first output end;
The operation module is configured to obtain a reference voltage according to the received at least one stage trigger point voltage and feedback voltage, and is provided with a first input end, a second input end and a second output end, wherein the first input end is electrically connected with the first output end of the voltage generation module, the at least one stage trigger point voltage is input through the first input end, the feedback voltage is input through the second input end, and the reference voltage is output through the second output end, and the feedback voltage is obtained based on the detected temperature of the over-temperature protection circuit;
The logic signal generating module is configured to generate a logic signal according to the received reference voltage so as to control other devices to work, and is provided with a third input end and a third output end, wherein the third input end is electrically connected with the second output end, the reference voltage is input through the third input end, and the logic signal is output through the third output end.
Further, the voltage generating module includes at least one set of voltage generating units, each set of voltage generating units including: the device comprises a first current source and a resistor, wherein one end of the resistor is electrically connected with a first connecting point which is the first output end, and the other end of the resistor is grounded;
wherein each group of voltage generating units is configured to set a first-stage over-temperature protection trigger point voltage.
Further, if the number of the voltage generating units is at least two, the resistances of the resistors selected in the at least two voltage generating units are different.
Further, the resistor is an adjustable resistor, and the resistance adjustment ranges of the adjustable resistors selected in the at least two groups of voltage generating units are different.
Further, the over-temperature protection circuit includes:
The voltage feedback module is configured to detect the temperature of the over-temperature protection circuit and obtain the feedback voltage according to the temperature, and is provided with a fourth output end for outputting the feedback voltage, and the fourth output end is electrically connected with the second input end.
Further, the operation module includes:
At least one operational amplifier configured to obtain an operational voltage according to the trigger point voltage and the feedback voltage, having the first input terminal, the second input terminal, and a fifth output terminal, and outputting the operational voltage through the fifth output terminal;
And an adder configured to obtain the reference voltage according to at least one received operation voltage, wherein the adder is provided with at least one fourth input end and a second output end, and the fourth input end is electrically connected with the fifth output end and inputs the operation voltage through the fourth input end.
Further, the at least one operational amplifier and the adder are integrated on the first chip.
Further, the number of the operational amplifiers is consistent with the number of the first output terminals; the number of the fourth input terminals is identical to the number of the operational amplifiers.
Further, the over-temperature protection circuit includes:
And at least one current rate adjusting module configured to adjust a coefficient of the operation voltage, and having a control terminal electrically connected to the controlled terminal of the operation amplifier and controlling the coefficient of the operation voltage generated by the operation amplifier through the control terminal.
Further, the logic signal generating module includes: the MOS transistor comprises a second current source, a first capacitor, a MOS transistor and a comparator;
The outflow end of the second current source, one end of the first capacitor, the drain electrode of the MOS transistor and the positive input end of the comparator are electrically connected with a second connection point, the other end of the first capacitor is grounded, the grid electrode of the MOS transistor is suspended to be connected with an external driving signal, the source electrode of the MOS transistor is grounded, the negative input end of the comparator is the third input end, and the output end of the comparator is the third output end.
Further, the second current source, the first capacitor, the MOS transistor, and the comparator are integrated in a second chip.
In a second aspect, the present invention provides an over-temperature protection system, which includes the over-temperature protection circuit described above.
The above at least one technical scheme adopted by the embodiment of the invention can achieve the following beneficial effects:
The over-temperature protection circuit provided by the embodiment of the invention comprises a voltage generation module, an operation module and a logic signal generation module, wherein the voltage generation module is provided with at least one level of over-temperature protection trigger point voltage, the operation module obtains a reference voltage according to the received at least one level of over-temperature protection trigger point voltage and the feedback voltage based on the feedback voltage obtained by the temperature of the detected over-temperature protection circuit, and the logic signal generation module generates logic signals according to the received reference voltage to control other devices to work, so that the over-temperature protection circuit provided by the embodiment of the invention has at least one over-temperature protection trigger point, and a current curve can be dynamically regulated and controlled in the process of triggering over-temperature protection, thereby being capable of flexibly adapting to different application environments and meeting the application requirements of products with over-temperature protection requirements under different application environments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic structural diagram of an over-temperature protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage generating module in an over-temperature protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an actual application scenario of an over-temperature protection circuit according to an embodiment of the present invention;
Fig. 4 is a graph showing a slope change of an output current curve of an over-temperature protection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an over-temperature protection circuit provided by an embodiment of the present invention includes: the connection and operation relationships between the voltage generating module 10, the operation module 20 and the logic signal generating module 30 are described below, and the connection and operation relationships between the voltage generating module 10, the operation module 20 and the logic signal generating module 30 are specifically as follows:
The voltage generating module 10 is configured to set at least one stage of over-temperature protection trigger point voltage, the voltage generating module 10 has at least one first output terminal 11, and outputs the trigger point voltage through the first output terminal 11, wherein the trigger point voltage values output by the at least one first output terminal 11 are different. The voltage generating module 10 may be a chip having a function of configuring at least one stage of over-temperature protection trigger point voltage, which may be set at least one stage of over-temperature protection trigger point voltage; or the voltage generating module 10 may include at least one set of voltage generating units 10a, through which at least one level of over-temperature protection trigger point voltage is regulated.
In particular, as shown in fig. 2, the voltage generating module 10 may include at least one set of voltage generating units 10a, and each set of voltage generating units 10a may include: the first current source D1 and the resistor R101, one end of the resistor R101 is electrically connected with the first current source D1, the first connection point 1 is a first output end 11, and the other end of the resistor R101 is grounded, wherein each group of voltage generating units is configured to set a first-stage over-temperature protection trigger point voltage, namely at least one group of voltage generating units 10a can output at least one temperature protection trigger point voltage; in a preferred embodiment of the present invention, if the number of the voltage generating units is at least two, the resistances of the resistors selected in the at least two voltage generating units are different. For example, the voltage generating module 10 may include two sets of voltage generating units 10a, and if the resistance value of the resistor R101 selected in each set of voltage generating units 10a is different, the over-temperature protection trigger point voltage output through the first output terminal 11 is different. The first current source D1 may be a constant current source or an adjustable current source.
In order to make the over-temperature protection trigger point voltage output by each set of voltage generating units 10a through the first output terminal 11 adjustable, it is preferable that the resistor R101 in the above embodiment is an adjustable resistor R101, and the resistance adjustment ranges of the adjustable resistor R101 selected in at least two sets of voltage generating units 10a are different, so that the over-temperature protection trigger point voltage output by each set of voltage generating units 10a through the first output terminal 11 is different, and each set of voltage generating units 10a can output at least one temperature protection trigger point voltage. The resistance value of the adjustable resistor can be adjusted by adjusting a gear button or an adjusting knob displayed on an interactive interface or an adjusting interface corresponding to the over-temperature protection circuit.
The operation module 20 is configured to obtain a reference voltage according to the received at least one stage trigger point voltage and a feedback voltage, and has a first input terminal 22, a second input terminal 21, and a second output terminal 23, where the first input terminal 22 is electrically connected to the first output terminal 11, and inputs the at least one stage trigger point voltage through the first input terminal 22, the second input terminal 21 inputs the feedback voltage, and the second output terminal 23 outputs the reference voltage, and the feedback voltage is obtained based on the detected temperature of the over-temperature protection circuit, and the voltage value of the feedback voltage is inversely proportional to the temperature.
In particular, the operation module 20 may include at least one operation amplifier 26 and an adder 27, where the operation amplifier 26 is configured to obtain an operation voltage according to the trigger point voltage and the feedback voltage, and has a first input terminal 22, a second input terminal 21, and a fifth output terminal 25, and outputs the operation voltage through the fifth output terminal 25, and the adder 27 is configured to obtain a reference voltage according to the received at least one operation voltage, and has at least one fourth input terminal 24 and a second output terminal 23, where the fourth input terminal 24 is electrically connected to the fifth output terminal 25, and the operation voltage is input through the fourth input terminal 24, the operation voltage is obtained through the operation amplifier 26 according to the trigger point voltage and the feedback voltage, and the adder 27 obtains the reference voltage according to the received at least one operation voltage. Of course, other devices or circuits may be used in the operation module 20 to obtain the reference voltage according to the at least one stage trigger point voltage and the feedback voltage, for example, at least one operation amplifier 26 and an adder 27 are integrated on the first chip, and so on.
Preferably, the number of operational amplifiers 26 corresponds to the number of first outputs 11. The number of fourth inputs 24 corresponds to the number of operational amplifiers 26.
The logic signal generating module 30 is configured to generate a logic signal according to the received reference voltage to control the operation of other devices, and has a third input terminal 31 and a third output terminal, the third input terminal 31 is electrically connected to the second output terminal 23, the reference voltage is input through the third input terminal 31, and the logic signal is output through the third output terminal.
In particular, the logic signal generating module 30 may include: a second current source D2, a first capacitor C101, a MOS transistor Q101, and a comparator U101. The outflow end of the second current source D2, one end of the first capacitor C101, the drain of the MOS transistor Q101, and the positive input end of the comparator U101 are electrically connected to the second connection point 2, the other end of the first capacitor C101 is grounded, the gate of the MOS transistor Q101 is suspended to be connected to an external driving signal, the source of the MOS transistor Q101 is grounded, the negative input end of the comparator U101 is the third input end 31, and the output end of the comparator U101 is the third output end. Of course, the logic signal generating module 30 may also use other devices or circuits to generate logic signals according to the reference voltage to control other devices to operate, such as the second current source D2, the first capacitor C101, the MOS transistor Q101, and the comparator U101 integrated on the second chip, and so on.
Further, as shown in fig. 1, the over-temperature protection circuit in the above embodiment may include at least one current rate adjustment module 40 configured to adjust a coefficient of an operation voltage, and having a control terminal 41, where the control terminal 41 is electrically connected to the controlled terminal 28 of the operational amplifier 26, and controls the coefficient of the operation voltage generated by the operational amplifier 26 through the control terminal 41. The current rate adjustment module may be an adjustable resistor, an adjustable panel, an adjustable interface, an APP application, a selectable gear or other virtual key, or the like. The embodiment of the invention provides a current rate adjusting module, which can adjust the coefficient of operation voltage through the current rate adjusting module so as to adjust the descending rate of output current in different over-temperature sections, thereby adjusting the slope of an output current curve.
By way of example, assume that the application scenario is: the over-temperature protection circuit provided by the embodiment of the invention is applied to a BUCK constant current circuit topological structure, the BUCK constant current circuit is other devices, the BUCK constant current circuit comprises an external main power switch tube, a driving signal processing module, an inductor and an LED load circuit, the grid electrode of the external main power switch tube is electrically connected with the driving signal processing module, a logic signal generated by a comparator U101 is input to the driving signal processing module through an output end (namely a third output end), the source electrode of the external main power switch tube is electrically connected with a current sampling resistor, the drain electrode of the external main power switch tube is electrically connected with one end of the inductor, and the other end of the inductor is electrically connected with the circuit of the LED load circuit. The LED load circuit can be an LED light source product such as a bulb lamp, a down lamp, a panel lamp, a projection lamp, a fresh lamp, a street lamp and the like.
As shown in fig. 3, when the inductive freewheel period is finished, that is, the inductor discharges to zero, the external driving signal connected to the gate of the MOS transistor Q101 is changed from high level to low level, the second current source D2 charges the first capacitor C101 with a constant current, and the external main power switch is maintained in an off state at this stage; when the charging voltage of the first capacitor C101 reaches the reference voltage of the comparator U101, the comparator U101 outputs a logic signal which is changed from a low level to a high level, at the moment, an external main power switch tube is conducted, an inductor enters a charging period, the first capacitor C101 is continuously in a charging state, and the logic signal output by the comparator U101 is continuously unchanged at the high level; when the inductor charging is finished and enters a freewheel period, the external driving signal is converted from a low level to a high level, the MOS transistor Q101 is immediately turned on, the first capacitor C101 is rapidly discharged to zero, at the moment, the output logic signal of the comparator U101 is converted from the high level to the low level, and the external main power switch tube is in an off state during the period, so that the process is repeated.
The parameters of the over-temperature protection circuit provided by the embodiment of the invention are as follows:
The feedback voltage is VBE, the number of trigger point voltages is two, VT1 and VT2, respectively, and VT2< VT1, as shown in fig. 1. The voltage generating module 10 includes two sets of voltage generating units 10a, where the two sets of voltage generating units 10a generate voltages VT1 and VT2, respectively, and VT1 and VT2 can be flexibly adjusted and set through a resistor R101 and a resistor R101, respectively, and an implementation manner of the adjustment and the setting can be realized by adjusting a gear button or an adjusting knob displayed on an interaction interface or an adjusting interface corresponding to the over-temperature protection circuit. If the values of VT1 and VT2 are smaller, the higher the threshold point characterizing the system over-temperature protection (OTP) trigger, as shown in FIG. 2. In addition, in the case of the optical fiber,
The first operational amplifier 26 has the following operation formula: v1=k1× (VT 1-VBE), and the second operational amplifier 26 has the following operational formula: v2=k2× (VT 2-VBE), the operation of adder 27 is: v3=v1+v2. The decreasing rate of the output current Iout of the product in different intervals can be adjusted by adjusting the values of the K1 and K2 coefficients, and the adjustment mode of the K1 and K2 coefficients can be realized by adjusting a current rate adjusting module (such as an adjustable resistor, an adjustable panel, an adjustable interface, an APP application program, an optional gear or other virtual keys).
In particular, the method comprises the steps of,
When VT2< VBE < VT1, v3=k1× (VT 1-VBE), at this time, the temperature of the product exceeds the temperature corresponding to VT1, and the delay time is added, that is, the time from the end of the freewheeling of the switching tube to the instant when the next switching cycle is turned on again. That is, the higher the temperature of the product, the smaller the feedback voltage VBE and the longer the delay time;
When VBE < VT2, v3=k1× (VT 1-VBE) +k2× (VT 2-VBE); at this time, when the temperature of the product exceeds the temperature corresponding to VT2, V3 becomes faster along with the change of the feedback voltage VBE, and under the same temperature rise condition, the increment of V3 increases, which indicates that delay time is longer, current limiting rate is faster, and the slope of the current curve of the output current Iout is steeper, as shown in fig. 4.
The over-temperature protection circuit provided by the embodiment of the invention comprises a voltage generation module, an operation module and a logic signal generation module, wherein the voltage generation module is provided with at least one level of over-temperature protection trigger point voltage, the operation module obtains a reference voltage according to the received at least one level of over-temperature protection trigger point voltage and the feedback voltage based on the feedback voltage obtained by the temperature of the detected over-temperature protection circuit, and the logic signal generation module generates logic signals according to the received reference voltage to control other devices to work, so that the over-temperature protection circuit provided by the embodiment of the invention has at least one over-temperature protection trigger point, and a current curve can be dynamically regulated and controlled in the process of triggering over-temperature protection, thereby being capable of flexibly adapting to different application environments and meeting the application requirements of products with over-temperature protection requirements under different application environments.
In an embodiment, the over-temperature protection circuit provided by the embodiment of the invention may include: and the voltage feedback module. The voltage feedback module detects the temperature of the over-temperature protection circuit and obtains feedback voltage according to the temperature, and the voltage feedback module is provided with a fourth output end for outputting the feedback voltage, and the fourth output end is electrically connected with the second input end. In particular, the voltage feedback module may employ a conversion circuit that includes a temperature sensor.
The over-temperature protection system provided by the embodiment of the invention can comprise: the over-temperature protection circuit comprises a voltage generation module 10, an operation module 20 and a logic signal generation module 30, wherein the connection and the working relation among the voltage generation module 10, the operation module 20 and the logic signal generation module 30 are respectively described as follows:
The voltage generating module 10 is configured to set at least one stage of over-temperature protection trigger point voltage, the voltage generating module 10 has at least one first output terminal 11, and outputs the trigger point voltage through the first output terminal 11, wherein the trigger point voltage values output by the at least one first output terminal 11 are different. The voltage generating module 10 may be a chip having a function of configuring at least one stage of over-temperature protection trigger point voltage, which may be set at least one stage of over-temperature protection trigger point voltage; or the voltage generating module 10 may include at least one set of voltage generating units 10a, through which at least one level of over-temperature protection trigger point voltage is regulated.
In particular, as shown in fig. 2, the voltage generating module 10 may include at least one set of voltage generating units 10a, and each set of voltage generating units 10a may include: the first current source D1 and the resistor R101, one end of the resistor R101 is electrically connected with the first current source D1, the first connection point 1 is a first output end 11, and the other end of the resistor R101 is grounded, wherein each group of voltage generating units is configured to set a first-stage over-temperature protection trigger point voltage, namely at least one group of voltage generating units 10a can output at least one temperature protection trigger point voltage; in a preferred embodiment of the present invention, if the number of the voltage generating units is at least two, the resistances of the resistors selected in the at least two voltage generating units are different. For example, the voltage generating module 10 may include two sets of voltage generating units 10a, and when the resistances of the resistors R101 selected in each set of voltage generating units 10a are different, the over-temperature protection trigger point voltages output through the first output terminal 11 are different, and the first current source D1 may be a constant current source or an adjustable current source.
In order to make the over-temperature protection trigger point voltage output by each set of voltage generating units 10a through the first output terminal 11 adjustable, it is preferable that the resistor R101 in the above embodiment is an adjustable resistor R101, and the resistance adjustment ranges of the adjustable resistor R101 selected in at least two sets of voltage generating units 10a are different, so that the over-temperature protection trigger point voltage output by each set of voltage generating units 10a through the first output terminal 11 is different, and each set of voltage generating units 10a can output at least one temperature protection trigger point voltage. The resistance value of the adjustable resistor can be adjusted by adjusting a gear button or an adjusting knob displayed on an interactive interface or an adjusting interface corresponding to the over-temperature protection circuit.
The operation module 20 is configured to obtain a reference voltage according to the received at least one stage trigger point voltage and a feedback voltage, and has a first input terminal 22, a second input terminal 21, and a second output terminal 23, where the first input terminal 22 is electrically connected to the first output terminal 11, and inputs the at least one stage trigger point voltage through the first input terminal 22, the second input terminal 21 inputs the feedback voltage, and the second output terminal 23 outputs the reference voltage, and the feedback voltage is obtained based on the detected temperature of the over-temperature protection circuit, and the voltage value of the feedback voltage is inversely proportional to the temperature.
In particular, the operation module 20 may include at least one operation amplifier 26 and an adder 27, where the operation amplifier 26 is configured to obtain an operation voltage according to the trigger point voltage and the feedback voltage, and has a first input terminal 22, a second input terminal 21, and a fifth output terminal 25, and outputs the operation voltage through the fifth output terminal 25, and the adder 27 is configured to obtain a reference voltage according to the received at least one operation voltage, and has at least one fourth input terminal 24 and a second output terminal 23, where the fourth input terminal 24 is electrically connected to the fifth output terminal 25, and the operation voltage is input through the fourth input terminal 24, the operation voltage is obtained through the operation amplifier 26 according to the trigger point voltage and the feedback voltage, and the adder 27 obtains the reference voltage according to the received at least one operation voltage. Of course, other devices or circuits may be used in the operation module 20 to obtain the reference voltage according to the at least one stage trigger point voltage and the feedback voltage, for example, at least one operation amplifier 26 and an adder 27 are integrated on the first chip, and so on.
Preferably, the number of operational amplifiers 26 corresponds to the number of first outputs 11. The number of fourth inputs 24 corresponds to the number of operational amplifiers 26.
The logic signal generating module 30 is configured to generate a logic signal according to the received reference voltage to control the operation of other devices, and has a third input terminal 31 and a third output terminal, the third input terminal 31 is electrically connected to the second output terminal 23, the reference voltage is input through the third input terminal 31, and the logic signal is output through the third output terminal.
In particular, the logic signal generating module 30 may include: a second current source D2, a first capacitor C101, a MOS transistor Q101, and a comparator U101. The outflow end of the second current source D2, one end of the first capacitor C101, the drain of the MOS transistor Q101, and the positive input end of the comparator U101 are electrically connected to the second connection point 2, the other end of the first capacitor C101 is grounded, the gate of the MOS transistor Q101 is suspended to be connected to an external driving signal, the source of the MOS transistor Q101 is grounded, the negative input end of the comparator U101 is the third input end 31, and the output end of the comparator U101 is the third output end. Of course, the logic signal generating module 30 may also use other devices or circuits to generate logic signals according to the reference voltage to control other devices to operate, such as the second current source D2, the first capacitor C101, the MOS transistor Q101, and the comparator U101 integrated on the second chip, and so on.
Further, as shown in fig. 1, the over-temperature protection circuit in the above embodiment may include at least one current rate adjustment module 40 configured to adjust a coefficient of an operation voltage, and having a control terminal 41, where the control terminal 41 is electrically connected to the controlled terminal 28 of the operational amplifier 26, and controls the coefficient of the operation voltage generated by the operational amplifier 26 through the control terminal 41. The current rate adjustment module may be an adjustable resistor, an adjustable panel, an adjustable interface, an APP application, a selectable gear or other virtual key, or the like. The embodiment of the invention provides a current rate adjusting module, which can adjust the coefficient of operation voltage through the current rate adjusting module so as to adjust the descending rate of output current in different sections, thereby adjusting the slope of an output current curve.
By way of example, assume that the application scenario is: the over-temperature protection circuit provided by the embodiment of the invention is applied to a BUCK constant current circuit topological structure, the BUCK constant current circuit is other devices, the BUCK constant current circuit comprises an external main power switch tube, a driving signal processing module, an inductor and an LED load circuit, the grid electrode of the external main power switch tube is electrically connected with the driving signal processing module, a logic signal generated by a comparator U101 is input to the driving signal processing module through an output end (namely a third output end), the source electrode of the external main power switch tube is electrically connected with a current sampling resistor, the drain electrode of the external main power switch tube is electrically connected with one end of the inductor, and the other end of the inductor is electrically connected with the circuit of the LED load circuit. The LED load circuit can be an LED light source product such as a bulb lamp, a down lamp, a panel lamp, a projection lamp, a fresh lamp, a street lamp and the like.
As shown in fig. 3, when the inductive freewheel period is finished, that is, the inductor discharges to zero, the external driving signal connected to the gate of the MOS transistor Q101 is changed from high level to low level, the second current source D2 charges the first capacitor C101 with a constant current, and the external main power switch is maintained in an off state at this stage; when the charging voltage of the first capacitor C101 reaches the reference voltage of the comparator U101, the comparator U101 outputs a logic signal which is changed from a low level to a high level, at the moment, an external main power switch tube is conducted, an inductor enters a charging period, the first capacitor C101 is continuously in a charging state, and the logic signal output by the comparator U101 is continuously unchanged at the high level; when the inductor charging is finished and enters a freewheel period, the external driving signal is converted from a low level to a high level, the MOS transistor Q101 is immediately turned on, the first capacitor C101 is rapidly discharged to zero, at the moment, the output logic signal of the comparator U101 is converted from the high level to the low level, and the external main power switch tube is in an off state during the period, so that the process is repeated.
The parameters of the over-temperature protection circuit provided by the embodiment of the invention are as follows:
The feedback voltage is VBE, the number of trigger point voltages is two, VT1 and VT2, respectively, and VT2< VT1, as shown in fig. 1. The voltage generating module 10 includes two sets of voltage generating units 10a, where the two sets of voltage generating units 10a generate voltages VT1 and VT2, respectively, and VT1 and VT2 can be flexibly adjusted and set through a resistor R101 and a resistor R102, respectively, and an implementation manner of the adjustment and the setting can be realized by adjusting a gear button or an adjusting knob displayed on an interaction interface or an adjusting interface corresponding to the over-temperature protection circuit. If the values of VT1 and VT2 are smaller, the higher the threshold point characterizing the system over-temperature protection (OTP) trigger, as shown in FIG. 2. In addition, in the case of the optical fiber,
The first operational amplifier 26 has the following operation formula: v1=k1× (VT 1-VBE), and the second operational amplifier 26 has the following operational formula: v2=k2× (VT 2-VBE), the operation of adder 27 is: v3=v1+v2. The decreasing rate of the output current Iout of the product in different intervals can be adjusted by adjusting the values of the K1 and K2 coefficients, and the adjustment mode of the K1 and K2 coefficients can be realized by adjusting a current rate adjusting module (such as an adjustable resistor, an adjustable panel, an adjustable interface, an APP application program, an optional gear or other virtual keys).
In particular, the method comprises the steps of,
When VT2< VBE < VT1, v3=k1× (VT 1-VBE), at this time, the temperature of the product exceeds the temperature corresponding to VT1, and the delay time is added, that is, the time from the end of the freewheeling of the switching tube to the instant when the next switching cycle is turned on again. That is, the higher the temperature of the product, the smaller the feedback voltage VBE and the longer the delay time;
When VBE < VT2, v3=k1× (VT 1-VBE) +k2× (VT 2-VBE); at this time, when the temperature of the product exceeds the temperature corresponding to VT2, V3 becomes faster along with the change of the feedback voltage VBE, and under the same temperature rise condition, the increment of V3 increases, which indicates that delay time is longer, current limiting rate is faster, and the current curve slope of the output current Iout of the product is steeper, as shown in fig. 4.
Of course, the over-temperature protection circuit may further include other electrical devices, and details of the related content in the above embodiment of the present invention are not described herein.
The over-temperature protection circuit provided by the embodiment of the invention comprises a voltage generation module, an operation module and a logic signal generation module, wherein the voltage generation module is provided with at least one level of over-temperature protection trigger point voltage, the operation module obtains a reference voltage according to the received at least one level of over-temperature protection trigger point voltage and the feedback voltage based on the feedback voltage obtained by the temperature of the detected over-temperature protection circuit, and the logic signal generation module generates logic signals according to the received reference voltage to control other devices to work, so that the over-temperature protection circuit provided by the embodiment of the invention has at least one over-temperature protection trigger point, and a current curve can be dynamically regulated and controlled in the process of triggering over-temperature protection, thereby being capable of flexibly adapting to different application environments and meeting the application requirements of products with over-temperature protection requirements under different application environments.
It will be apparent to those skilled in the art that while preferred embodiments of the present invention have been described, additional variations and modifications may be made to these embodiments once the basic inventive concepts are known to those skilled in the art. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. An over-temperature protection circuit, comprising:
the voltage generation module is configured to set at least one stage of over-temperature protection trigger point voltage, is provided with at least one first output end and outputs the over-temperature protection trigger point voltage through the first output end;
The operation module is configured to obtain a reference voltage according to the received at least one stage of over-temperature protection trigger point voltage and feedback voltage, and is provided with a first input end, a second input end and a second output end, wherein the first input end is electrically connected with the first output end of the voltage generation module, the at least one stage of over-temperature protection trigger point voltage is input through the first input end, the feedback voltage is input through the second input end, and the reference voltage is output through the second output end, and the feedback voltage is obtained based on the detected temperature of the over-temperature protection circuit;
The logic signal generation module is configured to generate a logic signal according to the received reference voltage so as to control other devices to work, and is provided with a third input end and a third output end, wherein the third input end is electrically connected with the second output end, the reference voltage is input through the third input end, and the logic signal is output through the third output end;
the voltage generation module comprises at least two groups of voltage generation units, and the voltages of the over-temperature protection trigger points output by the at least two groups of voltage generation units through the first output end are different;
The operation module comprises:
at least two operational amplifiers configured to obtain an operational voltage according to the over-temperature protection trigger point voltage and the feedback voltage, having the first input terminal, the second input terminal, and a fifth output terminal, and outputting the operational voltage through the fifth output terminal; each group of the voltage generating units is connected to the first input end of each operational amplifier;
And the adder is configured to obtain the reference voltage according to the received at least two operation voltages, and is provided with at least one fourth input end and a second output end, wherein the fourth input end is electrically connected with the fifth output end, and the operation voltage is input through the fourth input end.
2. The over-temperature protection circuit according to claim 1, wherein each set of the voltage generating units includes: the device comprises a first current source and a resistor, wherein one end of the resistor is electrically connected with a first connecting point which is the first output end, and the other end of the resistor is grounded;
wherein each group of voltage generating units is configured to set a first-stage over-temperature protection trigger point voltage.
3. The excess temperature protection circuit of claim 2, wherein,
The resistances of the resistors selected in the at least two sets of voltage generating units are different.
4. The over-temperature protection circuit according to claim 3, wherein the resistor is an adjustable resistor, and the resistance adjustment ranges of the adjustable resistors selected from the at least two sets of voltage generating units are different.
5. The over-temperature protection circuit of claim 1, wherein the over-temperature protection circuit comprises:
The voltage feedback module is configured to detect the temperature of the over-temperature protection circuit and obtain the feedback voltage according to the temperature, and is provided with a fourth output end for outputting the feedback voltage, and the fourth output end is electrically connected with the second input end.
6. The over-temperature protection circuit of claim 1, wherein the over-temperature protection circuit comprises:
And at least one current rate adjusting module configured to adjust a coefficient of the operation voltage, and having a control terminal electrically connected to the controlled terminal of the operation amplifier and controlling the coefficient of the operation voltage generated by the operation amplifier through the control terminal.
7. The over-temperature protection circuit of claim 1, wherein the logic signal generation module comprises: the MOS transistor comprises a second current source, a first capacitor, a MOS transistor and a comparator;
The outflow end of the second current source, one end of the first capacitor, the drain electrode of the MOS transistor and the positive input end of the comparator are electrically connected with a second connection point, the other end of the first capacitor is grounded, the grid electrode of the MOS transistor is suspended to be connected with an external driving signal, the source electrode of the MOS transistor is grounded, the negative input end of the comparator is the third input end, and the output end of the comparator is the third output end.
8. The over-temperature protection circuit of claim 7, wherein at least one operational amplifier and the adder are integrated on a first chip; the second current source, the first capacitor, the MOS transistor, and the comparator are integrated on a second chip.
9. An over-temperature protection system, characterized by comprising an over-temperature protection circuit according to any one of the preceding claims 1-8.
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