CN216954886U - Mixed type multi-point OTP acquisition circuit of charger - Google Patents
Mixed type multi-point OTP acquisition circuit of charger Download PDFInfo
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- CN216954886U CN216954886U CN202220144729.6U CN202220144729U CN216954886U CN 216954886 U CN216954886 U CN 216954886U CN 202220144729 U CN202220144729 U CN 202220144729U CN 216954886 U CN216954886 U CN 216954886U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to the technical field of circuit protection, and provides a hybrid multi-point OTP acquisition circuit of a charger, which comprises a main control module, a signal isolation module, a signal judgment module and a temperature acquisition module which are sequentially connected; the temperature acquisition module comprises at least one group of temperature protection branches, a divider resistor and an NTC resistor, wherein the divider resistor is connected with each group of temperature protection branches in series, and every two temperature protection branches are connected in parallel; the temperature protection branch is connected with the NTC resistor; by arranging the signal isolation module, the signal judgment module and the temperature acquisition module which are connected with the main control module, a simple temperature protection branch is arranged, and the protection of the multi-point OTP is realized corresponding to each NTC resistor, so that the temperature detection efficiency is high, the temperature can be accurately judged, and the temperature protection of the circuit is completed; and the circuit structure is simple, and the cost is lower.
Description
Technical Field
The utility model relates to the technical field of circuit protection, in particular to a hybrid multi-point OTP acquisition circuit of a charger.
Background
In the application field of power electronic conversion technology, a power device is one of electronic components which are most widely applied and have the highest use frequency at present. The power device can generate a large amount of heat in the working process, so that heat dissipation and temperature monitoring are needed, and if the heat dissipation is insufficient or an over-temperature protection circuit is unreliable, the power device can be subjected to thermal breakdown, so that the power device is permanently failed.
The common over-temperature protection circuit is based on a thermistor or a thermosensitive temperature switch, and the temperature switch is more widely applied due to the characteristics of simple structure, convenient use, simple corresponding protection circuit and the like. In high-voltage and high-power occasions, a plurality of power modules often share a radiator, and at the moment, the problem of voltage resistance between a temperature switch contact and a shell exists. The voltage resistance problem is usually solved by adopting a high voltage resistance temperature switch or adding an insulating ceramic chip, but the method has the defects of increasing the cost or reducing the temperature detection accuracy and the like.
That is, the conventional OTP protection circuit (over temperature protection circuit) has the disadvantages of more circuit components, high cost, and increased defective rate due to more components.
Disclosure of Invention
The utility model provides a hybrid multi-point OTP acquisition circuit of a charger, which solves the technical problems of more circuit elements and high cost of the existing OTP protection circuit.
In order to solve the technical problems, the utility model provides a hybrid multi-point OTP acquisition circuit of a charger, which comprises a main control module, a signal isolation module, a signal judgment module and a temperature acquisition module which are sequentially connected; the temperature acquisition module comprises at least one group of temperature protection branch circuits and a divider resistor, wherein the divider resistor is connected with each group of temperature protection branch circuits in series, and every two temperature protection branch circuits are connected in parallel.
The basic scheme is provided with the signal isolation module, the signal judgment module and the temperature acquisition module which are connected with the main control module, and the simple temperature protection branch is arranged to correspond to each NTC resistor, so that the multi-point OTP protection is realized, the temperature detection efficiency is high, the temperature can be accurately judged, and the temperature protection of the circuit is completed; and the circuit structure is simple, and the cost is lower.
In a further embodiment, the temperature protection branch comprises a three-terminal shunt reference source, a protection capacitor, a pull-down resistor and an NTC resistor; the ground terminal of the three-terminal shunt reference source is grounded, the input terminal of the three-terminal shunt reference source is connected with the NTC resistor and grounded through the pull-down resistor, and the output terminal of the three-terminal shunt reference source is connected with the signal judgment module; one end of the protection capacitor is connected with the output end of the three-terminal shunt reference source, and the other end of the protection capacitor is connected with the NTC resistor.
In a further embodiment, one end of the voltage dividing resistor is connected with a power supply, and the other end of the voltage dividing resistor is connected with the output end of each group of the three-terminal shunt reference sources.
In a further embodiment, the signal isolation module comprises first to fourth resistors, an optocoupler, a switch tube and a first capacitor; when the switch tube is an N-channel MOS tube, a pin 1 of the optocoupler is connected with a power supply through the first resistor, a pin 2 is connected with a drain electrode of the switch tube, a pin 3 is connected with the main control module and grounded through a second resistor, and a pin 4 is connected with the power supply;
in a further embodiment, the source of the switching tube is grounded; the grid is grounded through a third resistor and the first capacitor respectively, and is also connected with the signal judgment module through a fourth resistor.
In a further embodiment, the signal judgment module comprises a comparator, a diode, fifth to eighth resistors, a second capacitor and a third capacitor; the anode of the diode is connected with the output end of the comparator, and the cathode of the diode is connected with the signal isolation module; one end of the fifth resistor is connected with a power supply, and the other end of the fifth resistor is connected with the output end of the comparator; one end of the sixth resistor is connected with the output end of the comparator, and the other end of the sixth resistor is connected with the positive input end of the comparator; the power end of the comparator is connected with a power supply and is grounded through the second capacitor, the grounding end of the comparator is grounded, the reverse input end of the comparator is connected with the temperature acquisition module and is grounded through the third capacitor, and the forward input end of the comparator is connected with the power supply through the seventh resistor and is grounded through the eighth resistor.
The scheme takes a three-terminal shunt reference source as a core, and pull-down resistors are respectively arranged on the reference voltage (2.5V) of the three-terminal shunt reference source to determine each OTP point needing an NTC resistor. Along with the temperature rise of a thermistor detection device (NTC resistor), the resistance value of the thermistor is reduced, and finally 1-pin 2.5V reference of the three-terminal shunt reference source is triggered, at the moment, 2-pin voltage of the three-terminal shunt reference source is converted from high voltage to low voltage, so that the forward input end of the comparator is higher than the reverse input end, the switch tube is conducted, and the OTP pin of the MCU end is connected to a temperature protection signal (OTP signal) transmitted through the optocoupler. The method provides powerful guarantee for the accuracy of temperature protection, and reduces the cost for repairing and adjusting the temperature protection points.
In further embodiments, the three-terminal shunt reference source comprises a TL431 three-terminal shunt reference source.
In a further embodiment, the master control module is an MCU.
In a further embodiment, the NTC resistor is in close proximity to the target power device.
Drawings
Fig. 1 is a system framework diagram of a hybrid multi-point OTP acquisition circuit of a charger according to an embodiment of the present invention;
FIG. 2 is a hardware circuit diagram of the signal isolation module of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a hardware circuit diagram of the signal determination module in FIG. 1 according to an embodiment of the present invention;
FIG. 4 is a hardware circuit diagram of the temperature acquisition module in FIG. 1 according to an embodiment of the present invention;
wherein: the temperature control device comprises a main control module 1, a signal isolation module 2, a signal judgment module 3, a temperature acquisition module 4, a temperature protection branch 41 and a voltage dividing resistor 42.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the utility model, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the utility model, since many variations thereof are possible without departing from the spirit and scope of the utility model.
As shown in fig. 1, the hybrid multi-point OTP acquisition circuit of a charger according to an embodiment of the present invention includes a main control module 1, a signal isolation module 2, a signal determination module 3, and a temperature acquisition module 4, which are connected in sequence; the temperature acquisition module 4 includes at least one set of temperature protection branches 41 and a voltage dividing resistor 42 (i.e., a resistor R9 in fig. 4), where the voltage dividing resistor 42 is connected in series with each set of temperature protection branches 41, and every two sets of temperature protection branches 41 are connected in parallel.
In this embodiment, the main control module 1 is an MCU.
In this embodiment, referring to fig. 2, the signal isolation module 2 includes first to fourth resistors R1 to R4, an optocoupler U1, a switching tube Q1, and a first capacitor C1; when the switching tube Q1 is an N-channel MOS transistor, the pin 1 of the optocoupler U1 is connected to a power supply through the first resistor R1, the pin 2 is connected to the drain of the switching tube Q1, the pin 3 is connected to the main control module 1, and is grounded through the second resistor R2, and the pin 4 is connected to the power supply;
in this embodiment, the source of the switching tube Q1 is grounded; the gate is grounded through a third resistor R3 and the first capacitor C1, and is also connected to the signal determination module 3 through the fourth resistor R4.
In this embodiment, referring to fig. 3, the signal determining module 3 includes a comparator U2, a diode D1, fifth to eighth resistors R5 to R8, a second capacitor C2, and a third capacitor C3; the anode of the diode D1 is connected with the output end of the comparator U2, and the cathode of the diode D1 is connected with the signal isolation module 2; one end of the fifth resistor R5 is connected with a power supply, and the other end of the fifth resistor R5 is connected with the output end of the comparator U2; one end of the sixth resistor R6 is connected with the output end of the comparator U2, and the other end of the sixth resistor R6 is connected with the positive input end of the comparator U2; the power end of the comparator U2 is connected to a power supply and is grounded through the second capacitor C2, the ground end is grounded, the reverse input end is connected to the temperature acquisition module 4 and is grounded through the third capacitor C3, and the forward input end is connected to the power supply through the seventh resistor R7 and is grounded through the eighth resistor R8.
In this embodiment, referring to fig. 4, the temperature protection branch 41 includes three-terminal shunt reference sources (e.g., U3, U4, U5 in fig. 4), protection capacitors (e.g., C4, C5, C6 in fig. 2), pull-down resistors (R10, R11, R12), and NTC resistors (e.g., NTC1, NTC2, NTC3 in fig. 2); the ground terminal of the three-terminal shunt reference source is grounded, the input terminal of the three-terminal shunt reference source is connected with the NTC resistor and grounded through the pull-down resistor, and the output terminal of the three-terminal shunt reference source is connected with the signal judgment module 3; one end of the protection capacitor is connected with the output end of the three-end shunt reference source, and the other end of the protection capacitor is connected with the NTC resistor.
In this embodiment, the NTC resistor is in close proximity to the target power device.
In this embodiment, the three-terminal shunt reference source includes a TL431 three-terminal shunt reference source. According to actual needs, the threshold of the temperature protection point (i.e. the OTP point of the target power device) can be adjusted by adjusting the parameter of the pull-down resistor.
In this embodiment, one end of the voltage dividing resistor 42 is connected to a power supply, and the other end is connected to an output end of each set of the three-terminal shunt reference source.
In the embodiment, a three-terminal shunt reference source is taken as a core, and pull-down resistors are respectively arranged on reference voltages (2.5V) of the three-terminal shunt reference source to determine each OTP point requiring an NTC resistor. Along with the temperature rise of a thermistor detection device (NTC resistor), the resistance value of the thermistor is reduced, and finally 1-pin 2.5V reference of the three-terminal shunt reference source is triggered, at the moment, 2-pin voltage of the three-terminal shunt reference source is converted from high voltage to low voltage, so that the forward input end of the comparator is higher than the reverse input end, the switch tube is conducted, and the OTP pin of the MCU end is connected to a temperature protection signal (OTP signal) transmitted through the optocoupler. The accuracy of temperature protection is powerfully guaranteed, and the repair and adjustment cost of the temperature protection point is reduced.
In this embodiment, three temperature protection branches 41 with three-terminal shunt reference sources U3, U4, and U5 (TL 431) as cores are provided as an example, and the working principle is as follows:
the pull-down resistors R10, R11 and R12 are respectively set by the reference voltage (2.5V) of the three-terminal shunt reference sources U3, U4 and U5 to determine the OTP point of each device (target power device) needing protection.
The NTC1, the NTC2 and the NTC3 are negative temperature coefficient thermistors (namely NTC resistors), the resistance of the thermistor is smaller as the temperature is higher, the resistance of the thermistor is reduced along with the temperature rise of the thermistor detection device, the 1-pin 2.5V reference of the three-terminal shunt reference source is finally triggered, and at the moment, the 2-pin voltage of the three-terminal shunt reference source is converted from high voltage to low voltage.
The 2 pins of the U3, the U4 and the U5 are connected with the reverse input end of the comparator U2, the forward input end of the comparator U2 is higher than the reverse input end, the output end (1 pin) of the comparator U2 is switched from low level to high level, the switch tube Q1 is switched on, and the OTP pin of the MCU end is connected with the OTP signal transmitted by the optical coupler U1.
The embodiment of the utility model is provided with the signal isolation module 2, the signal judgment module 3 and the temperature acquisition module 4 which are connected with the main control module 1, and the simple temperature protection branch 41 is arranged to correspond to each NTC resistor, so that the multi-point OTP protection is realized, the temperature detection efficiency is high, the temperature can be accurately judged, and the temperature protection of the circuit is completed; and the circuit structure is simple, and the cost is lower.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (8)
1. The utility model provides a hybrid multiple spot OTP acquisition circuit of charger which characterized in that: the temperature monitoring device comprises a main control module, a signal isolation module, a signal judgment module and a temperature acquisition module which are connected in sequence; the temperature acquisition module comprises at least one group of temperature protection branch circuits, a divider resistor and an NTC resistor, wherein the divider resistor is connected with each group of temperature protection branch circuits in series, and every two temperature protection branch circuits are connected in parallel.
2. The hybrid multi-point OTP acquisition circuit for a charger of claim 1, wherein: the temperature protection branch comprises a three-terminal shunt reference source, a protection capacitor, a pull-down resistor and an NTC resistor; the ground terminal of the three-terminal shunt reference source is grounded, the input terminal of the three-terminal shunt reference source is connected with the NTC resistor and grounded through the pull-down resistor, and the output terminal of the three-terminal shunt reference source is connected with the signal judgment module; one end of the protection capacitor is connected with the output end of the three-end shunt reference source, and the other end of the protection capacitor is connected with the NTC resistor.
3. The hybrid multi-point OTP acquisition circuit for a charger of claim 2, wherein: one end of the divider resistor is connected with the power supply, and the other end of the divider resistor is connected with the output end of each group of the three-end shunt reference source.
4. The hybrid multi-point OTP acquisition circuit for a charger of claim 1, wherein: the signal isolation module comprises first to fourth resistors, an optical coupler, a switching tube and a first capacitor; when the switch tube is an N-channel MOS tube, a pin 1 of the optocoupler is connected with a power supply through the first resistor, a pin 2 is connected with a drain electrode of the switch tube, a pin 3 is connected with the main control module and grounded through a second resistor, and a pin 4 is connected with the power supply;
the source electrode of the switch tube is grounded; the grid is grounded through a third resistor and the first capacitor respectively, and is also connected with the signal judgment module through a fourth resistor.
5. The hybrid multi-point OTP acquisition circuit for a charger of claim 4, wherein: the signal judgment module comprises comparators, diodes, fifth to eighth resistors, a second capacitor and a third capacitor; the anode of the diode is connected with the output end of the comparator, and the cathode of the diode is connected with the signal isolation module; one end of the fifth resistor is connected with a power supply, and the other end of the fifth resistor is connected with the output end of the comparator; one end of the sixth resistor is connected with the output end of the comparator, and the other end of the sixth resistor is connected with the positive input end of the comparator; the power end of the comparator is connected with a power supply and is grounded through the second capacitor, the grounding end is grounded, the reverse input end is connected with the temperature acquisition module and is grounded through the third capacitor, and the forward input end is connected with the power supply through the seventh resistor and is grounded through the eighth resistor.
6. The hybrid multi-point OTP acquisition circuit for a charger of claim 2, wherein: the three-terminal shunt reference source comprises a TL431 three-terminal shunt reference source.
7. The hybrid multi-point OTP acquisition circuit for a charger of claim 1, wherein: the main control module is an MCU.
8. The hybrid multi-point OTP acquisition circuit for a charger of claim 1, wherein: the NTC resistor is in close proximity to the target power device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220144729.6U CN216954886U (en) | 2022-01-19 | 2022-01-19 | Mixed type multi-point OTP acquisition circuit of charger |
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| CN202220144729.6U CN216954886U (en) | 2022-01-19 | 2022-01-19 | Mixed type multi-point OTP acquisition circuit of charger |
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| CN216954886U true CN216954886U (en) | 2022-07-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307771A (en) * | 2022-10-10 | 2022-11-08 | 深圳市锐深科技有限公司 | Temperature measuring circuit and method based on NTC sensor |
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- 2022-01-19 CN CN202220144729.6U patent/CN216954886U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115307771A (en) * | 2022-10-10 | 2022-11-08 | 深圳市锐深科技有限公司 | Temperature measuring circuit and method based on NTC sensor |
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