Over-temperature protection circuit, chip integrated module, control circuit and lighting device

Abstract

The present invention discloses an over-temperature protection circuit, a chip integrated module, a control circuit and a lighting device. In the over-temperature protection circuit of the present invention, compared with the prior art, two pins and two electrical signal input terminals need to be set respectively. In the over-temperature protection circuit of the present invention, the over-temperature protection trigger module and the slope determination module are connected to one electrical signal input terminal together, thereby reducing the number of input terminals of the over-temperature protection circuit. Therefore, after the over-temperature protection circuit is set as a part of the chip integrated module, the number of pins of the chip integrated module can be reduced.

Description

Technical Field

[0001] The present application relates to the field of chip integration technology, and in particular to an over-temperature protection circuit, a chip integration module, a control circuit and a lighting device. Background Art

[0002] Over-temperature protection is an important protection function in circuit applications. Products with over-temperature protection requirements will be designed with corresponding over-temperature protection circuits.

[0003] In the existing chip integrated module, in order to have an over-temperature protection function and determine the slope of the temperature-current / voltage curve after the over-temperature protection is triggered, two pins need to be set on the chip integrated module. The two pins are respectively connected to the over-temperature protection trigger module and the slope determination module in the chip integrated module. The over-temperature protection trigger module is used to determine whether the over-temperature protection function is triggered for a first electrical signal input from one pin, and the slope determination module is used to determine the slope of the temperature-current / voltage curve for a second electrical signal input from another pin.

[0004] It can be seen that in the prior art, in order to realize the over-temperature protection function in the chip integrated module, a large number of pins in the chip integrated module need to be occupied. Summary of the invention

[0005] The present invention discloses an over-temperature protection circuit to solve the technical problem that a large number of pins of the chip integrated module are required to realize the over-temperature protection function in the prior art chip integrated module. In addition, the present invention also provides a chip integrated module, a control circuit and a lighting device.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, an over-temperature protection circuit is provided, comprising: an electrical signal input terminal, an over-temperature protection trigger module and a slope determination module;

[0008] The electrical signal input terminal is used to receive a parameter setting electrical signal;

[0009] The over-temperature protection trigger module has an input end and an output end, the input end of the over-temperature protection trigger module is connected to the electrical signal input end, and when the over-temperature protection function of the over-temperature protection trigger module is triggered by the parameter setting electrical signal, the output end of the over-temperature protection trigger module outputs the over-temperature protection electrical signal;

[0010] The slope determination module has an input end and an output end, the input end of the slope determination module is connected to the electrical signal input end, and the output end of the slope determination module outputs an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal.

[0011] The over-temperature protection circuit described above, the over-temperature protection trigger module includes at least two over-temperature comparators, the over-temperature comparators include an input end and an output end, the input end of each over-temperature comparator is respectively connected to the electrical signal input end, each over-temperature comparator is respectively provided with a different first reference electrical signal interval, the output end of each over-temperature comparator outputs each first level signal based on the comparison result of the parameter setting electrical signal and the first reference electrical signal interval, and the over-temperature protection trigger module determines the voltage or current interval of the parameter setting electrical signal according to all the first level signals;

[0012] The slope determination module includes at least two slope comparators, each of which includes an input end and an output end, the input end of each of the slope comparators is respectively connected to the electrical signal input end, each of the slope comparators is respectively provided with a different second reference electrical signal interval, the output end of each of the slope comparators outputs a second level signal based on a comparison result between the parameter setting electrical signal and the second reference electrical signal interval, and the slope determination module obtains the voltage or current interval in which the parameter setting electrical signal is located according to each of the second level signals.

[0013] In the above-mentioned over-temperature protection circuit, any of the first reference electrical signal intervals is not equal to any of the second reference electrical signal intervals;

[0014] Any of the second reference electrical signal intervals is a subset of the first reference electrical signal interval, or any of the first reference electrical signal intervals is a subset of the second reference electrical signal interval.

[0015] In the above-mentioned over-temperature protection circuit, the cumulative interval of the first reference electrical signal intervals of all the over-temperature comparators is a first continuous interval; the cumulative interval of the second reference electrical signal intervals of all the slope comparators is a second continuous interval; the numerical range of the first continuous interval is the same as that of the second continuous interval.

[0016] The above-mentioned over-temperature protection circuit,

[0017] Each of the over-temperature comparators includes a first reference electrical signal interval, and all the first reference electrical signal intervals do not overlap with each other; the number of segments of the second reference electrical signal interval in each of the slope comparators is the same as the number of over-temperature comparators of the over-temperature protection trigger module, and all the second reference electrical signal intervals do not overlap with each other;

[0018] and / or

[0019] Each of the slope comparators includes a second reference electrical signal interval, and all the second reference electrical signal intervals do not overlap with each other; the number of segments of the first reference electrical signal interval in each of the over-temperature comparators is the same as the number of slope comparators in the slope determination module, and all the first reference electrical signal intervals do not overlap with each other.

[0020] In the above-mentioned over-temperature protection circuit, the lengths of the first reference electrical signal intervals in each section are completely the same, completely different, or partially the same; the cumulative lengths of the second reference electrical signal intervals of each slope comparator are completely the same, completely different, or partially the same;

[0021] and / or

[0022] The cumulative lengths of the second reference electrical signal intervals of the slope comparators are completely the same, completely different, or partially the same; the lengths of the first reference electrical signal intervals of the segments are completely the same, completely different, or partially the same.

[0023] In the above-mentioned over-temperature protection circuit, the electrical signal input terminal is a voltage signal input terminal, and the over-temperature comparator and the slope comparator are current comparators;

[0024] or

[0025] The electrical signal input terminal is a current signal input terminal, and the over-temperature comparator and the slope comparator are voltage comparators.

[0026] The over-temperature protection circuit mentioned above, the over-temperature protection trigger module also includes an over-temperature signal generating circuit; the over-temperature signal generating circuit includes an input end and an output end, the input end of the over-temperature signal generating circuit is connected to the output ends of all the over-temperature comparators, and when the over-temperature protection function of the over-temperature protection trigger module is triggered by the adjustable signal, the output end of the over-temperature signal generating circuit outputs an over-temperature protection electrical signal;

[0027] and / or

[0028] The slope determination module also includes a slope selection circuit, which includes an input end and an output end, the input end of the slope selection circuit is connected to the output ends of all the slope comparators, and the output end of the slope selection circuit outputs an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal.

[0029] In a second aspect, a chip integrated module is provided, comprising a control pin and a logic control unit, wherein the logic control unit comprises the over-temperature protection circuit as described above, the control pin is connected to the electrical signal input end of the over-temperature protection circuit, the control pin is used to connect an external resistor, and the parameter sets the size of the electrical signal to change with the resistance value of the external resistor.

[0030] The above-mentioned chip integrated module also includes: an AC input pin, a second ground pin, a first ground pin, a rectifier unit and a power supply voltage input pin, wherein the rectifier unit has a rectifier input end, a rectifier output end and a common reference end, wherein the AC input pin is connected to the rectifier input end, the first ground pin is connected to the common reference end, and the second ground pin is connected to the logic control unit; the power supply voltage input pin is connected to the rectifier output end.

[0031] The above-mentioned chip integrated module also includes a switch tube and a current signal sampling pin, the switch tube includes a source and a control electrode, the source electrode is connected to the current signal sampling pin and the logic control unit, and the logic control unit is connected to the control electrode to control the switch tube to be turned off or on.

[0032] The above-mentioned chip integrated module further includes a freewheeling diode, wherein the positive electrode of the freewheeling diode is connected to the rectifier output end, and the negative electrode of the freewheeling diode is connected to the power supply voltage input pin.

[0033] In a third aspect, a control circuit is provided, comprising an external resistor and the chip integrated module as described above, wherein one end of the external resistor is grounded, and the other end is connected to the control pin.

[0034] In a fourth aspect, a lighting device is provided, comprising a light-emitting unit and a control circuit as described above, wherein the control circuit is used to input direct current to the light-emitting unit.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] In an embodiment of the present invention, the over-temperature protection trigger module is used to output an over-temperature protection electrical signal when the over-temperature protection function is triggered, and the slope determination module is used to output an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal, so that after the over-temperature protection function is triggered, the over-temperature protection circuit determines the value of reducing the current / voltage according to the electrical signal representing the slope of the temperature-current / voltage curve to achieve over-temperature protection. Compared with the prior art, which requires two pins and two electrical signal input terminals to be set separately, the over-temperature protection trigger module and the slope determination module in the over-temperature protection circuit implemented by the present invention are connected to one electrical signal input terminal together, thereby reducing the number of input terminals of the over-temperature protection circuit. Therefore, after the over-temperature protection circuit is set as a part of the chip integrated module, the number of pins of the chip integrated module can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0038] Figure 1 A schematic diagram of the structure of an over-temperature protection circuit provided in Embodiment 1 of the present invention;

[0039] Figure 2 A schematic diagram of the structure of a chip integrated module provided in the second embodiment of the present invention;

[0040] Figure 3 for Figure 2 A schematic diagram of a logic control unit of a chip integrated module;

[0041] Figure 4 A schematic diagram of the structure of a control circuit provided in Embodiment 3 of the present invention.

[0042] Reference numerals:

[0043] 100-chip integrated module; 10-logic control unit; 11-temperature detection subunit; 12-control subunit; 13-driving subunit; 14-over-temperature protection circuit; 141-electrical signal input terminal; 142-over-temperature protection trigger module; 1421-over-temperature comparator; 1422-over-temperature signal generating circuit; 143-slope determination module; 1431-slope comparator; 1432-slope selection circuit;

[0044] 200-control circuit; 210-filter; 220-chopper; 230-AC module; 240-load.

[0045] UI1-input end of over temperature comparator; UI2-input end of slope comparator; UI3-input end of over temperature signal generating circuit; UI4-input end of slope selection circuit;

[0046] UO1- output end of over temperature comparator; UO2- output end of slope comparator; UO3- output end of over temperature signal generating circuit; UO4- output end of slope selection circuit;

[0047] Voptd-Voptu: first reference electrical signal interval; Vslpd-Vslpu: second reference electrical signal interval;

[0048] ACIN-AC input pin; ACIN1-AC first input pin; ACIN2-AC second input pin;

[0049] GND1-first ground pin; GND2-second ground pin;

[0050] D1-rectifier unit; D1IN-rectifier input terminal; D1IN1-rectifier first input terminal; D1IN2-rectifier second input terminal; D1OUT-rectifier output terminal; D1CG-common reference terminal; D2-freewheeling diode;

[0051] EC1-first capacitor; EC2-second capacitor; EC3-third capacitor;

[0052] L1-first inductor; L2-second inductor;

[0053] VIN-power supply voltage input pin;

[0054] ISEN-current signal sampling pin;

[0055] Q-switch tube; QS-switch tube source; QD-switch tube drain; QG-switch tube control electrode;

[0056] TH / SLP-control foot;

[0057] Rth / Rslp-external resistor; RL-parallel resistor; Rcs-sampling resistor;

[0058] LED-light-emitting unit;

[0059] Drain-drain pin;

[0060] AC-AC source; Fuse-fuse. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0062] In the embodiment of the present invention, the chip integrated module may be an AC-DC integrated module, or other chip integrated modules that require additional filters, which will not be described in detail herein. The electromagnetic compatibility may be EMI (ElectroMagneticInterference) electromagnetic compatibility requirements, or other electromagnetic compatibility requirements.

[0063] Implementation

[0064] The embodiment of the present invention provides an over-temperature protection circuit 14, such as Figure 1As shown, it includes: an electrical signal input terminal 141, an over-temperature protection trigger module 142 and a slope determination module 143. The electrical signal input terminal 141 is used to receive a parameter setting electrical signal. Specifically, the parameter setting electrical signal can come from a current source Is. The over-temperature protection trigger module 142 has an input terminal and an output terminal. The input terminal of the over-temperature protection trigger module 142 is connected to the electrical signal input terminal 141. The over-temperature protection trigger module 142 has an over-temperature protection function. When the over-temperature protection function is triggered by the parameter setting electrical signal, the output terminal UO1 of the over-temperature protection trigger module 142 outputs an over-temperature protection electrical signal. The slope determination module 143 has an input terminal and an output terminal. The input terminal of the slope determination module 143 is connected to the electrical signal input terminal 141. The output terminal of the slope determination module 143 outputs an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal.

[0065] In an embodiment of the present invention, the over-temperature protection trigger module 142 is used to output an over-temperature protection electrical signal when the over-temperature protection function is triggered, and the slope determination module 143 is used to output an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal, so that after the over-temperature protection function is triggered, the over-temperature protection circuit determines the value of reducing the current / voltage according to the electrical signal representing the slope of the temperature-current / voltage curve to achieve over-temperature protection. Compared with the prior art, which requires two pins and two electrical signal input terminals 141 to be set separately, the over-temperature protection trigger module 142 and the slope determination module 143 in the over-temperature protection circuit implemented by the present invention are connected to one electrical signal input terminal 141 together, thereby reducing the number of input terminals of the over-temperature protection circuit. Therefore, after the over-temperature protection circuit is set as a part of the chip integrated module, the number of pins of the chip integrated module can be reduced.

[0066] Among them, the signal value (voltage value or current value) of the parameter setting electrical signal is adjustable. For example, when the signal value is X, the over-temperature protection function of the over-temperature protection trigger module is not triggered; when the signal value is Y, the over-temperature protection function of the over-temperature protection trigger module is triggered, then it can be considered that the over-temperature protection of the over-temperature protection circuit is Y. For details, see Attachment Figure 1In order to realize the adjustable over-temperature protection threshold of the over-temperature protection circuit 14, for example, an over-temperature protection circuit is set for a current source Is, the current source Is can be connected to the electrical signal input terminal 141, and an external resistor Rth / Rslp with adjustable resistance is connected between the electrical signal input terminal 141 and the ground terminal. As the resistance of the external resistor Rth / Rslp changes, the electrical signal (i.e., the above-mentioned parameter setting electrical signal) input to the electrical signal input terminal 141 also changes, thereby adjusting the over-temperature protection threshold of the current source Is. Therefore, in the embodiment of the present invention, the over-temperature protection circuit 14 sets the over-temperature protection threshold of the current source Is and the slope of the temperature-current / voltage curve according to the size of the received parameter setting electrical signal; in other words, as the size of the parameter setting electrical signal changes, the over-temperature protection threshold of the over-temperature protection circuit for the current source Is and the slope of the temperature-current / voltage curve will also change. In practice, the parameter setting electrical signal can be an adjustable electrical signal or a constant electrical signal.

[0067] The over-temperature protection trigger module 142 includes at least two over-temperature comparators 1421, and the over-temperature comparator 1421 includes an input terminal UI1 and an output terminal UO1. The input terminal UI1 of each over-temperature comparator 1421 is respectively connected to the electrical signal input terminal 141, and each over-temperature comparator 1421 is respectively provided with a different first reference electrical signal interval Voptd-Voptu. At the output terminal UO1 of each over-temperature comparator 1421, each first level signal is outputted based on the comparison result of the parameter setting electrical signal and the first reference electrical signal interval Voptd-Voptu. In the over-temperature protection trigger module 142, the voltage or current interval in which the parameter setting electrical signal is located is determined according to all the first level signals. The number of over-temperature comparators 1421 in the over-temperature protection module can be three, four or more.

[0068] The slope determination module 143 includes at least two slope comparators 1432, and the slope comparator 1432 includes an input terminal UI2 and an output terminal UO2. The input terminal UI2 of each slope comparator 1432 is respectively connected to the electrical signal input terminal 141, and each slope comparator 1432 is respectively provided with a different second reference electrical signal interval Vslpd-Vslpu. The output terminal UO2 of each slope comparator 1432 outputs each second level signal based on the comparison result of the parameter setting electrical signal and the second reference electrical signal interval Vslpd-Vslpu. The slope determination module 143 obtains the voltage or current interval in which the parameter setting electrical signal is located according to each second level signal. In the slope determination module 143, the number of slope comparators 1432 can be three, four or more.

[0069] Among them, any of the first reference electrical signal intervals Voptd-Voptu is not equal to any of the second reference electrical signal intervals Vslpd-Vslpu. Any second reference electrical signal interval Vslpd-Vslpu is a subset of the first reference electrical signal interval Voptd-Voptu, or, any first reference electrical signal interval Voptd-Voptu is a subset of the second reference electrical signal interval Vslpd-Vslpu. This avoids having only one specific temperature-current / voltage curve slope under one over-temperature protection threshold, and instead reduces the current / voltage more reasonably according to whether the current temperature exceeds the over-temperature protection threshold; or, avoids having only one over-temperature protection threshold under one temperature-current / voltage curve slope.

[0070] In order to make the parameter setting electrical signal within the set range (such as Figure 1 When the over-temperature protection function is triggered within any current / voltage range (within the 0-V1 setting range), the corresponding electrical signal representing the slope of the temperature-current / voltage curve can be obtained. The cumulative interval of the first reference signal intervals of all over-temperature comparators 1421 is a first continuous interval; for example, the first reference electrical signal intervals Voptd-Voptu of the two over-temperature comparators 1421 are (4, 8] volts and (8, 12] volts respectively, then the cumulative interval of the first reference electrical signal intervals Voptd-Voptu of the two over-temperature comparators 1421 is (4, 12] volts, which is a continuous interval. The cumulative interval of the second reference electrical signal intervals Vslpd-Vslpu of all slope comparators 1432 is a second continuous interval; for example, the second reference electrical signal intervals Vslpd-Vslpu of the two slope comparators 1432 are (4, 6] volts and (6, 12] volts respectively, then the cumulative interval of the second reference electrical signal intervals Vslpd-Vslpu of the two slope comparators 1432 is (4, 12] volts, which is a continuous interval. Moreover, the numerical range of the first continuous interval is the same as that of the second continuous interval.

[0071] In an embodiment of the present invention, each over-temperature comparator 1421 may include a first reference electrical signal interval Voptd-Voptu, and all first reference electrical signal intervals Voptd-Voptu do not overlap. For example, the over-temperature protection trigger module 142 includes two over-temperature comparators 1421, and correspondingly, the two first reference electrical signal intervals Voptd-Voptu are (4, 8] volts and (8, 12] volts respectively. Correspondingly, the number of segments of the second reference electrical signal interval Vslpd-Vslpu in each slope comparator 1432 is the same as the number of over-temperature comparators 1421 of the over-temperature protector trigger module, and all second reference electrical signal intervals Vslpd-Vslpu do not overlap. For example, the over-temperature protection trigger module 1 42 includes two over-temperature comparators 1421. Each slope comparator 1432 in the slope determination module 143 has two sections of second reference electrical signals. If the slope determination module 143 has two slope comparators 1432, the two sections of the second reference electrical signal intervals Vslpd-Vslpu of the first slope comparator 1432 are (4, 6], (8, 10] volts respectively, and the second reference electrical signal intervals Vslpd-Vslpu at both ends of the second slope comparator 1432 are (6, 8], (10, 12] volts respectively.

[0072] When each over-temperature comparator 1421 includes a first reference electrical signal interval Vslpd-Vslpu, the lengths of each first reference electrical signal interval Voptd-Voptu may be completely the same, completely different, or partially the same. As described above, the over-temperature protection trigger module 142 includes two over-temperature comparators 1421. If the two first reference electrical signal intervals Voptd-Voptu are (4, 8] volts and (8, 12] volts respectively, the lengths of the two first reference electrical signal intervals Voptd-Voptu are the same; if the two first reference electrical signal intervals Voptd-Voptu are (4, 7] volts and (7, 12] volts respectively, the lengths of the two first reference electrical signal intervals Voptd-Voptu are different; if the number of comparators is three, the three first reference electrical signal intervals Voptd-Voptu are (4, 8] volts, (8, 12] volts and (12, 13] volts respectively, then the lengths of the three first reference electrical signal intervals Voptd-Voptu are partially the same.

[0073] It should be noted that all second reference electrical signal intervals Vslpd-Vslpu do not overlap with each other, including: all second reference electrical signal intervals Vslpd-Vslpu in the same slope comparator 1432 do not overlap with each other, and all second reference electrical signal intervals Vslpd-Vslpu of all slope comparators 1432 do not overlap with each other.

[0074] Correspondingly, the cumulative length of the second reference electrical signal interval Vslpd-Vslpu in each slope comparator 1432 can be completely the same, completely different or partially the same. For example, each slope comparator 1432 in the slope determination module 143 has two sections of the second reference electrical signal interval Vslpd-Vslpu. If there are two slope comparators 1432 in the slope determination module 143, the two sections of the second reference electrical signal interval Vslpd-Vslpu in the first slope comparator 1432 are (4, 6], (8, 10] volts, respectively, and the cumulative length is 4. The second reference electrical signal intervals Vslpd-Vslpu at both ends of the second slope comparator 1432 are (6, 8], (10, 12] volts, respectively, and the cumulative length is also 4. Then, the cumulative length of the second reference electrical signal interval Vslpd-Vslpu in the first slope comparator 1432 is equal to the second slope comparator 1432. The cumulative length of the second reference electrical signal interval Vslpd-Vslpu. For example, the two second reference electrical signal intervals Vslpd-Vslpu of the first slope comparator 1432 are (4, 5], (8, 10] volts respectively, and the second reference electrical signal intervals Vslpd-Vslpu at both ends of the second slope comparator 1432 are (5, 8], (10, 12] volts respectively, then the cumulative lengths of the two are different. If the slope determination module 143 has three second slope comparators 1432, then the cumulative length of the first slope comparator 1432 is 4, the cumulative length of the second slope comparator 1432 is 4, and the cumulative length of the third slope comparator 1432 can be 5, then the cumulative lengths of the three are partially the same.

[0075] As a variation, each slope comparator 1432 may include a second reference electrical signal interval Vslpd-Vslpu, and all second reference electrical signal intervals Vslpd-Vslpu do not overlap. Moreover, the number of segments of the first reference electrical signal interval Voptd-Voptu of each over-temperature comparator 1421 is the same as the number of slope comparators 1432 in the slope determination module 143, and all first reference electrical signal intervals Voptd-Voptu do not overlap. Correspondingly, the cumulative length of the second reference electrical signal interval Vslpd-Vslpu of each slope comparator 1432 may be completely the same, completely different, or partially the same; the length of each segment of the first reference electrical signal interval Voptd-Voptu may also be completely the same, completely different, or partially the same.

[0076] Among them, the first reference electrical signal interval Voptd-Voptu can be input by the input end of the over-temperature comparator 1421; the second reference electrical signal interval Vslpd-Vslpu can be input by the input end of the slope comparator 1432.

[0077] The number of slope comparators 1432 may be equal to, greater than, or less than the number of over-temperature comparators 1421 .

[0078] For example, in the embodiment of the present invention, the number of slope comparators 1432 is equal to the number of over-temperature comparators 1421, and all over-temperature comparators 1421 include a first reference electrical signal interval Voptd-Voptu, and all first reference electrical signal intervals Voptd-Voptu have the same length. The number of second reference electrical signals in each slope comparator 1432 is equal to the number of over-temperature comparators 1421, and the cumulative length of the second reference electrical signal interval Vslpd-Vslpu in each slope comparator 1432 is the same.

[0079] In the embodiment of the present invention, the electrical signal input terminal 141 is a voltage signal input terminal, and the electrical signal input terminal 141 receives the voltage signal to be measured, the over-temperature comparator 1421 and the slope comparator 1432 are current comparators, and correspondingly, the slope determination module 143 determines the slope of the temperature-voltage curve. As a variation, the electrical signal input terminal 141 is a current signal input terminal, and the electrical signal input terminal 141 receives the current signal to be measured, the over-temperature comparator 1421 and the slope comparator 1432 are voltage comparators, and correspondingly, the slope determination module 143 determines the slope of the temperature-current curve.

[0080] In an embodiment of the present invention, the over-temperature protection trigger module 142 also includes an over-temperature signal generating circuit 1422, and the over-temperature signal generating circuit 1422 includes an input terminal UI3 and an output terminal UO3, and the input terminal of the over-temperature signal generating circuit 1422 is connected to the output terminal UO1 of all over-temperature comparators 1421. The over-temperature signal generating circuit 1422 determines whether to output an over-temperature protection electrical signal according to the voltage / current interval in which the electrical signal is located according to the parameter setting. Therefore, the output terminal UO3 of the over-temperature signal generating circuit 1422 is used to output an over-temperature protection electrical signal when the over-temperature protection function is triggered. Among them, the current voltage / current reference value is a voltage / current value corresponding to the current temperature, which is determined based on the corresponding relationship between the preset temperature and the voltage / current.

[0081] The slope determination module 143 also includes a slope selection circuit 1432, which includes an input terminal UI4 and an output terminal UO4, and the input terminal UI4 of the slope selection circuit 1432 is connected to the output terminal UO2 of all slope comparators 1432. The slope selection circuit 1432 determines the slope of the temperature-current / voltage curve according to the voltage / current interval in which the parameter setting electrical signal is located. Therefore, the output terminal UO4 of the slope selection circuit 1432 outputs an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal.

[0082] It should be noted that in the implementation of the present invention, the input end of the over-temperature protection trigger module 142 is the input end UI1 of the over-temperature comparator 1421 and the input end UI2 of the slope comparator 1432; the output end of the over-temperature protection trigger module 142 is the output end UO3 of the over-temperature signal generating circuit 1422 and the output end UO4 of the slope selection circuit 1432.

[0083] In the over-temperature protection circuit 14 provided in the embodiment of the present invention, the over-temperature protection trigger module 142 and the slope driving module 143 are connected to one electrical signal input terminal 141, thereby reducing the number of input terminals of the over-temperature protection circuit 14. Therefore, after the over-temperature protection circuit 14 is assembled as a part of the chip integrated module 10, the number of pins of the chip integrated module 10 can be reduced.

[0084] Specifically, Figure 1 , when the current source Is remains unchanged, if the external resistance Rth / Rslp changes, the voltage of the parameter setting electrical signal will change, and in the over-temperature signal generating circuit 1422, the over-temperature protection threshold corresponding to the parameter setting electrical signal will also change. Therefore, in the over-temperature protection circuit 14 of the present invention, for the current source Is, the over-temperature protection threshold that triggers the over-temperature protection function can be determined based on the resistance value of the external resistance Rth / Rslp set between the electrical signal input terminal 141 and the ground terminal. Similarly, in Figure 1 In the case where the current source Is remains unchanged, if the external resistance Rth / Rslp changes, the voltage of the parameter setting electrical signal will also change. Then, in the slope selection circuit 1432, the electrical signal of the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal will also change.

[0085] Embodiment 2

[0086] like Figure 2 As shown, an embodiment of the present invention provides a chip integrated module 100, including: an AC input pin ACIN, a second ground pin GND2, a first ground pin GND1, a rectifier unit D1, a power supply voltage input pin VIN and a logic control unit 10. The rectifier unit D1 has a rectifier input terminal D1IN, a rectifier output terminal D1OUT, and a common reference terminal D1CG. The AC input pin ACIN is connected to the rectifier input terminal D1IN, the first ground pin GDN2 is connected to the common reference terminal D1CG, the second ground pin GND2 is connected to the logic control unit 10, and the power supply voltage input pin VIN is connected to the rectifier output terminal D1OUT. The rectifier input terminal D1 includes a rectifier first input terminal D1IN1 and a rectifier second input terminal D1IN2.

[0087] The chip integrated module 100 includes a second ground pin GND2 and a first ground pin GND1. Since the chip integrated module 100 has two ground pins, when the filter 210 is connected on the basis of the chip integrated module 100, the filter includes a first inductor L2 and a first capacitor EC1. The first inductor L2 of the filter 210 can be connected between the two ground pins, and then the first capacitor EC1 of the filter 210 is set between the power supply voltage input pin VIN and the first ground pin GND1, that is, the first capacitor EC1 of the filter 210 is placed at the rear end of the rectifier unit D1, that is, the input AC power is first rectified and then filtered, so that the filter 210 does not need to use safety capacitors but uses electrolytic capacitors or film capacitors to achieve filtering effects, which also makes it possible to significantly increase the cost and volume of the chip integrated module 100 after connecting the filter 210.

[0088] Among them, the AC input pin ACIN has two pins, namely Figure 2 The first AC input pin ACIN1 and the second AC input pin ACIN2 are used to connect 220V AC or other volt AC. The rectifier unit D1 can be a rectifier bridge or other rectifier elements, and the rectifier bridge can be a full bridge or a half bridge. The second ground pin GND2 and the first ground pin GND1 are two pins, respectively. Figure 2 The logic control unit 10 is used to determine the output drive instruction according to the input signal to drive the corresponding load 240.

[0089] The chip integrated module 100 further includes a switch tube Q and a current signal sampling pin ISEN. The switch tube Q includes a source QS, a drain QD and a control electrode QG. The source QD is connected to the current signal sampling pin ISEN and the logic control unit 10. The logic control unit 10 is connected to the control electrode QG of the switch tube Q, and outputs a driving signal to the control electrode QG of the switch tube Q based on the current current reduction or increase target in combination with the sampled current signal, so as to control the switch tube Q to be turned off or on, thereby achieving the purpose of adjusting the voltage or current.

[0090] The chip integrated module 100 further includes a freewheeling diode D2 , the anode of which is connected to the rectifier output terminal DIOUT, and the cathode of which is connected to the power supply voltage input pin VIN to prevent damage to components in the chip integrated module 100 due to sudden voltage changes.

[0091] Specifically, Figure 3As shown, the logic control unit 10 may include a temperature detection subunit 11, a control subunit 12, a driving subunit 13 and an over-temperature protection circuit 14 as mentioned in the first embodiment. Among them, the temperature detection subunit 11 is used to detect the current temperature of the chip integrated module 100, and send a logic signal to the control subunit 12 according to the detected current temperature. The control subunit 12 includes a first input terminal, a second input terminal and a logic output terminal, the first input terminal is connected to the temperature detection subunit 11, and the second input terminal is connected to the current signal sampling pin, that is, the control subunit 12 receives the logic signal sent by the temperature detection subunit 11 through the first input terminal. The logic output terminal is connected to the driving subunit 13 to output a driving signal to the driving subunit 13. The driving subunit 13 is connected between the logic output terminal and the control electrode of the switch tube, and is used to output a driving instruction to the control electrode of the switch tube according to the received driving signal, and the switch tube is turned on or off according to the driving instruction. Obviously, the output terminal of the above-mentioned driving subunit 13 is the output terminal of the logic control unit 10.

[0092] The chip integrated module 100 further includes a control pin TH / SLP, and the logic control unit 10 further includes an over-temperature protection circuit 14 as in the first embodiment. The control pin TH / SLP is connected to the input terminal UI1 of the over-temperature protection trigger module in the logic control unit 10, and the input terminal UI3 of the slope determination module, and the control pin TH / SLP is used to connect the external resistor Rth / Rslp. The logic control unit 10 is connected to the control pin TH / SLP, and determines the over-temperature protection threshold and the temperature-current curve slope of the chip integrated module 100 according to the resistance value of the external resistor Rth / Rslp based on a preset mapping relationship.

[0093] Among them, the above-mentioned preset mapping relationship includes: based on the mapping relationship between the resistance range and the over-temperature protection value, according to the resistance range where the resistance value of the external resistor Rth / Rslp is located, determining the over-temperature protection threshold of the chip integrated module 100. The above-mentioned preset mapping relationship also includes: based on the mapping relationship between the resistance value and the slope of the temperature-current curve, according to the resistance value of the external resistor Rth / Rslp, determining the over-temperature protection threshold of the chip integrated module 100.

[0094] The establishment of the above-mentioned preset mapping relationship can refer to the above-mentioned embodiment 1, and then adjust the parameter setting electrical signal of the input over-temperature protection circuit 14 according to the external resistor Rth / Rslp, so as to determine the over-temperature protection threshold and the temperature-current curve slope based on the resistance value of the external resistor Rth / Rslp. For example, when the resistance value of the external resistor Rth / Rslp is between 100-200 ohms, the over-temperature protection threshold is A, and when the resistance value of the external resistor Rth / Rslp is between 200-300 ohms, the over-temperature protection threshold is B. If the current resistance value of the external resistor Rth / Rslp is 150 ohms, the over-temperature protection threshold is A, and the temperature-current curve slope is K1; if the current resistance value of the external resistor Rth / Rslp is adjusted to 180 ohms, the over-temperature protection threshold is still A, but the temperature-current curve slope is K2. Obviously, the external resistor Rth / Rslp is a resistor with adjustable resistance, which can be adjusted according to the actual needs of the chip integrated module 100.

[0095] For example, the temperature detection subunit 11 detects the current temperature of the chip integrated module 100, and sends a corresponding logic signal to the control subunit 12 based on the current temperature. The control subunit 12 obtains the corresponding over-temperature protection threshold value based on the resistance value of the external resistor Rth and the mapping relationship established by the over-temperature protection circuit 14, and determines whether the current temperature exceeds the over-temperature protection threshold value based on the logic signal. If it exceeds, it is necessary to cool down. The control subunit 12 obtains the slope of the temperature-current curve of the chip integrated module 100 based on the resistance value of the external resistor Rslp and the mapping relationship established by the over-temperature protection circuit 14, and determines how much current value needs to be adjusted based on the temperature value to be reduced or the target temperature value and the current current obtained by sampling, thereby calculating the corresponding drive signal and sending it to the drive subunit 13. The drive subunit 13 generates a drive instruction to drive the switch tube Q to turn on or off based on the drive signal, thereby completing the current regulation.

[0096] like Figure 2 The chip integrated module 100 provided in the embodiment of the present invention further includes a drain pin Drain of the switch tube Q.

[0097] It needs to be said that Figure 2 The figure only shows one arrangement of the pins in the chip integrated module 100 of the present invention, and the position relationship of the pins can be adaptively adjusted according to the actual situation.

[0098] Embodiment 3

[0099] like Figure 4 As shown, an embodiment of the present invention provides a control circuit 200, including a filter 210 and the chip integrated module 100 mentioned in the above-mentioned second embodiment. The filter 210 may be an EMI filter, or other types of filters.

[0100] The filter 210 includes a first inductor L2 and a first capacitor EC1. The first inductor L2 is used to achieve filtering. Its two ends are respectively connected to the second ground pin GND2 and the first ground pin GND1 of the chip integrated module 100. The second ground pin GND2 and the first ground pin GND1 are respectively grounded. The positive electrode of the first capacitor EC1 is connected to the power supply voltage input pin VIN, and the negative electrode of the first capacitor EC1 is connected to the second ground pin GND2.

[0101] In the embodiment of the present invention, the first capacitor EC1 of the filter 210 is arranged between the power supply voltage input pin VIN and the first ground pin GND1, that is, the first capacitor EC1 of the filter 210 is placed at the rear end of the rectifier unit D1, that is, the input AC power is first rectified and then filtered, so that the filter 210 does not need to use safety capacitors but uses electrolytic capacitors or film capacitors to achieve the filtering effect. Compared with the existing technology, the chip integrated module 100 can achieve the filtering function after connecting the filter 210 without significantly increasing the cost and volume.

[0102] The control circuit 200 further includes a sampling resistor Rcs, and the sampling resistor Rcs is connected between the current signal sampling pin ISEN and the second ground pin GND2 to implement sampling of the current in the circuit.

[0103] The chip integrated module 100 further includes a control pin TH / SLP, and the logic control unit 10 is connected to the control pin TH / SLP. The control circuit 200 includes an external resistor RthRth / Rslp, and the external resistor Rth / Rslp is connected between the control pin TH / SLP and the second ground pin GND2. The logic control unit 10 determines the over-temperature protection threshold of the chip integrated module 100 and the slope of the temperature-current curve of the chip integrated module 100 according to the resistance value of the external resistor Rth / Rslp.

[0104] The control circuit 200 further includes a chopper 220 , which is connected between the chip integrated module 100 and a load 240 , so that the voltage output to the load 240 is variable.

[0105] The above-mentioned chip integrated module 100 includes a switch tube Q, and the switch tube Q includes a drain QD; the chopper 220 includes a second inductor L1 and a second capacitor EC2, and the second inductor L1 is connected between the drain QD and the load 240; the positive electrode of the second capacitor EC2 is connected to the power supply voltage input pin VIN, and the negative electrode of the second capacitor EC2 is connected to the second ground pin GND2.

[0106] In addition, the control circuit 200 also includes an AC module 230, which includes an AC source AC and a fuse Fuse. The AC source AC is connected to the AC input pin ACIN; the fuse Fuse is connected between the AC source AC and the AC input pin ACIN to disconnect when the current exceeds a specified value, thereby protecting the chip integrated module 100.

[0107] In the embodiment of the present invention, the load 240 may include a light emitting unit LED, or other components that need to be powered by direct current. Figure 4 The load 240 includes a third capacitor EC3 and a parallel resistor RL which are arranged in parallel with the LED light emitting unit.

[0108] Embodiment 4

[0109] An embodiment of the present invention provides a lighting device, which includes a light-emitting unit LED and a control circuit 200 in the third embodiment. The control circuit 200 is used to input direct current to the light-emitting unit LED, and the light-emitting unit LED is used to emit lighting light.

[0110] It should be understood by those skilled in the art that, although the preferred embodiments of the present invention have been described, other changes and modifications may be made to these embodiments once those skilled in the art have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0111] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An over-temperature protection circuit, characterized in that: include: An electrical signal input terminal, an over-temperature protection trigger module, and a slope determination module; The electrical signal input terminal is used to receive a parameter setting electrical signal; The over-temperature protection trigger module has an input end and an output end, the input end of the over-temperature protection trigger module is connected to the electrical signal input end, and when the over-temperature protection function of the over-temperature protection trigger module is triggered by the parameter setting electrical signal, the output end of the over-temperature protection trigger module outputs the over-temperature protection electrical signal; The slope determination module has an input end and an output end, the input end of the slope determination module is connected to the electrical signal input end, and the output end of the slope determination module outputs an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal.

2. The over-temperature protection circuit according to claim 1, characterized in that: The over-temperature protection trigger module includes at least two over-temperature comparators, each of which includes an input end and an output end, the input end of each of the over-temperature comparators is respectively connected to the electrical signal input end, each of the over-temperature comparators is respectively provided with a different first reference electrical signal interval, the output end of each of the over-temperature comparators outputs a first level signal based on a comparison result between the parameter setting electrical signal and the first reference electrical signal interval, and the over-temperature protection trigger module determines the voltage or current interval in which the parameter setting electrical signal is located according to all the first level signals; The slope determination module includes at least two slope comparators, each of which includes an input end and an output end, the input end of each of the slope comparators is respectively connected to the electrical signal input end, each of the slope comparators is respectively provided with a different second reference electrical signal interval, the output end of each of the slope comparators outputs a second level signal based on a comparison result between the parameter setting electrical signal and the second reference electrical signal interval, and the slope determination module obtains the voltage or current interval in which the parameter setting electrical signal is located according to each of the second level signals.

3. The over-temperature protection circuit according to claim 2, characterized in that: Any of the first reference electrical signal intervals is not equal to any of the second reference electrical signal intervals; Any of the second reference electrical signal intervals is a subset of the first reference electrical signal interval, or any of the first reference electrical signal intervals is a subset of the second reference electrical signal interval.

4. The over-temperature protection circuit according to claim 2, characterized in that: The cumulative interval of the first reference electrical signal intervals of all the over-temperature comparators is a first continuous interval; the cumulative interval of the second reference electrical signal intervals of all the slope comparators is a second continuous interval; the numerical range of the first continuous interval is the same as that of the second continuous interval.

5. The over-temperature protection circuit according to claim 4, characterized in that: Each of the over-temperature comparators includes a first reference electrical signal interval, and all the first reference electrical signal intervals do not overlap with each other; the number of segments of the second reference electrical signal interval in each of the slope comparators is the same as the number of over-temperature comparators of the over-temperature protection trigger module, and all the second reference electrical signal intervals do not overlap with each other; and / or Each of the slope comparators includes a second reference electrical signal interval, and all the second reference electrical signal intervals do not overlap with each other; the number of segments of the first reference electrical signal interval in each of the over-temperature comparators is the same as the number of slope comparators in the slope determination module, and all the first reference electrical signal intervals do not overlap with each other.

6. The over-temperature protection circuit according to claim 2, characterized in that: The lengths of the first reference electrical signal intervals described in each section are completely the same, completely different, or partially the same; the cumulative lengths of the second reference electrical signal intervals of each slope comparator are completely the same, completely different, or partially the same; and / or The cumulative lengths of the second reference electrical signal intervals of the slope comparators are completely the same, completely different, or partially the same; the lengths of the first reference electrical signal intervals of the segments are completely the same, completely different, or partially the same.

7. The over-temperature protection circuit according to claim 2, characterized in that: The electrical signal input terminal is a voltage signal input terminal, and the over-temperature comparator and the slope comparator are current comparators; or The electrical signal input terminal is a current signal input terminal, and the over-temperature comparator and the slope comparator are voltage comparators.

8. The over-temperature protection circuit according to claim 2, characterized in that: The over-temperature protection trigger module also includes an over-temperature signal generating circuit; the over-temperature signal generating circuit includes an input end and an output end, the input end of the over-temperature signal generating circuit is connected to the output ends of all the over-temperature comparators, and when the over-temperature protection function of the over-temperature protection trigger module is triggered by the adjustable signal, the output end of the over-temperature signal generating circuit outputs an over-temperature protection electrical signal; and / or The slope determination module also includes a slope selection circuit, which includes an input end and an output end, the input end of the slope selection circuit is connected to the output ends of all the slope comparators, and the output end of the slope selection circuit outputs an electrical signal representing the slope of the temperature-current / voltage curve corresponding to the parameter setting electrical signal.

9. A chip integrated module, characterized in that: It includes a control pin and a logic control unit, the logic control unit includes the over-temperature protection circuit as described in any one of claims 1 to 8, the control pin is connected to the electrical signal input end of the over-temperature protection circuit, the control pin is used to connect an external resistor, and the size of the parameter setting electrical signal changes with the resistance value of the external resistor.

10. The chip integrated module according to claim 9, characterized in that: Also includes: An AC input pin, a second ground pin, a first ground pin, a rectifier unit and a power supply voltage input pin, wherein the rectifier unit has a rectifier input terminal, a rectifier output terminal and a common reference terminal, wherein the AC input pin is connected to the rectifier input terminal, the first ground pin is connected to the common reference terminal, and the second ground pin is connected to the logic control unit; the power supply voltage input pin is connected to the rectifier output terminal.

11. The chip integrated module according to claim 10, characterized in that: The chip integrated module also includes a switch tube and a current signal sampling pin, the switch tube includes a source and a control electrode, the source electrode is connected to the current signal sampling pin and the logic control unit, and the logic control unit is connected to the control electrode to control the switch tube to be turned off or on.

12. The chip integrated module according to claim 10, characterized in that: The chip integrated module further comprises a freewheeling diode, wherein the positive electrode of the freewheeling diode is connected to the rectifier output terminal, and the negative electrode of the freewheeling diode is connected to the power supply voltage input pin.

13. A control circuit, characterized in that: It comprises an external resistor and a chip integrated module as claimed in any one of claims 9 to 12, wherein one end of the external resistor is grounded and the other end is connected to the control pin.

14. A lighting device, characterized in that: It comprises a light-emitting unit and a control circuit as claimed in claim 13, wherein the control circuit is used to input direct current to the light-emitting unit.

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