CN117589323B - High-voltage isolation area temperature acquisition circuit - Google Patents
High-voltage isolation area temperature acquisition circuit Download PDFInfo
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- CN117589323B CN117589323B CN202410077672.6A CN202410077672A CN117589323B CN 117589323 B CN117589323 B CN 117589323B CN 202410077672 A CN202410077672 A CN 202410077672A CN 117589323 B CN117589323 B CN 117589323B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/12—Recording operating variables ; Monitoring of operating variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
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Abstract
The invention relates to the technical field of charging and distribution of new energy automobiles, in particular to a temperature acquisition circuit of a high-voltage isolation area; the high-voltage isolation region temperature acquisition circuit comprises: a low dropout linear voltage regulator, an operational amplifier, a photoelectric coupler and a temperature detection thermistor NTC1; the invention provides a high-efficiency and high-cost-efficiency temperature acquisition circuit, and the excellent structure and smart design of the temperature acquisition circuit bring multiple beneficial effects; the invention can convert the collected temperature signal into the PWM signal with the duty ratio changed through the temperature detection thermistor which is precisely selected, such as NCP18XH103F03RB, and the conversion mode has the advantages that the PWM signal can be effectively isolated through the optical coupling element with lower cost and reliability, thereby ensuring that the signal is not influenced by interference and noise during the transmission to the main control MCU.
Description
Technical Field
The invention relates to the technical field of charging and distribution of new energy automobiles, in particular to a temperature acquisition circuit for a high-voltage isolation area.
Background
The new energy automobile fills electrical system and all needs to carry out temperature acquisition to the heating point in high voltage isolation district to the mode that will gather is passed to main control MCU through the isolation, then carries out temperature control to the heating point. There are various ways to collect the temperature of the high voltage isolation region and then transmit it to the main control MCU of the non-isolation region. If the high-voltage isolation area originally has a controlled MCU, the temperature acquisition of the heating point of the high-voltage isolation area is greatly facilitated, and the controlled MCU transmits the acquired temperature information to the main control MCU of the non-isolation area through the isolated data communication channel.
However, in most cases, the high-voltage isolation area has no controlled MCU, in order to realize temperature acquisition of the high-voltage isolation area, either a temperature acquisition circuit is separately designed in the high-voltage isolation area, then the controlled MCU transmits information to the main control MCU through an isolated data communication bus, or a separate temperature signal acquisition and processing circuit is designed, and then the temperature signal is transmitted to the main control MCU through a special linear isolation chip and an operational amplifier reprocessing mode.
In order to overcome the problems, the invention designs a master control MCU which can safely and reliably transmit the temperature information of the heating point of the high-voltage isolation region to the non-isolation region by adopting only one 4 operational amplifier, one optocoupler, one power supply LDO and a small number of peripheral elements.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a high-voltage isolation region temperature acquisition circuit to solve the technical problems of high cost and complex circuit of a single high-voltage isolation region temperature acquisition circuit of a power distribution system of a new energy vehicle.
The technical scheme for solving the technical problems is as follows:
the utility model provides a high voltage isolation district temperature acquisition circuit, high voltage isolation district temperature acquisition circuit includes: a low dropout linear voltage regulator, an operational amplifier, a photoelectric coupler and a temperature detection thermistor NTC1;
the operational amplifier is a one-piece four-operational amplifier U1, and comprises an operational amplifier U1A, an operational amplifier U1B, an operational amplifier U1C and an operational amplifier U1D, wherein the operational amplifier U1A, the operational amplifier U1B and the operational amplifier U1D are used as triangular wave generation modules, and the operational amplifier U1C and the temperature detection thermistor NTC1 are used as temperature detection comparison modules;
the ninth pin of the operational amplifier U1C is connected to the output voltage VCC of the low dropout linear regulator through a resistor R1, and is further connected to a first end of a resistor R9, a second end of the resistor R9 is connected to the digital output driving ground OGND through a capacitor C6, and the second end of the resistor R9 is further connected to the high voltage isolation region ground OGND through a resistor R10 and the temperature detection thermistor NTC1 which are connected in series;
the tenth pin of the operational amplifier U1C is connected to the seventh pin of the operational amplifier U1B, and the seventh pin of the operational amplifier U1B is used as the output of the triangular wave generating module to output triangular waves;
and an eighth pin of the operational amplifier U1C is used as an output, and a temperature pulse width modulation signal is output to the photoelectric coupler.
Further, the second pin of the operational amplifier U1A is connected to the thirteenth pin and the fourth pin of the operational amplifier U1D, and is further connected to the 5 th pin of the operational amplifier U1B, the third pin of the operational amplifier U1A is connected to the first pin thereof via a resistor R3, and is further connected to the 7 th pin of the operational amplifier U1B via a resistor R7, the fourth pin of the operational amplifier U1A is connected to the output voltage VCC of the low dropout regulator, and is further connected to the digital output driving ground OGND via capacitors C1 and C2 connected in parallel, and the eleventh pin of the operational amplifier U1A is connected to the high voltage isolation region OGND;
the sixth pin of the operational amplifier U1B is connected with the first pin of the operational amplifier U1A through a resistor R2 and is also connected with the seventh pin of the operational amplifier U1A through a capacitor C4;
twelve pins of the operational amplifier U1D are connected to the digital output driving ground OGND through a resistor R11, and are also connected to the output voltage VCC of the low dropout linear regulator through a resistor R4.
Further, the model of the one-chip four operational amplifier U1 is LMV324, the resistance of the resistor R1 is 5.1kΩ, the resistance of the resistor R9 is 51Ω, the resistance of the resistor R10 is 51Ω, and the capacitance of the capacitor C6 is 100nF.
Further, the resistance of the resistor R2 is 13kΩ, the resistance of the resistor R3 is 36kΩ, the resistance of the resistor R4 is 51kΩ, the resistance of the resistor R7 is 33kΩ, the resistance of the resistor R11 is 51kΩ, the capacitance of the capacitor C1 is 100nF, the capacitance of the capacitor C2 is 4.7uF, and the capacitance of the capacitor C4 is 100nF.
Further, a first pin of the photocoupler is connected to an output end of the operational amplifier U1C through a resistor R5, a second pin of the photocoupler is connected to the digital output driving ground OGND, a third pin of the photocoupler is grounded, and a fourth pin of the photocoupler is connected to a 3.3V dc voltage through a resistor R6;
the fourth pin of the photoelectric coupler is used as output, the isolated temperature pulse width modulation signal is output and transmitted to the vehicle-mounted charger through a resistor R8, and the second end of the resistor R8 is grounded through a capacitor C5.
Further, the model of the photocoupler is LTV-817, the resistor R5 is 2KΩ, the resistor R6 is 10KΩ, the resistor R8 is 1KΩ, and the capacitor C5 is 1nF.
Further, the second pin of the low dropout linear regulator is connected to a 13.5V dc power supply, the first pin thereof is grounded, and the third pin thereof outputs a voltage VCC;
and a capacitor C3 with a capacitance value of 4.7uF is connected between the first pin and the second pin of the low dropout linear voltage regulator in a bridging way.
Further, the model of the temperature detection thermistor NTC1 is NCP18XH103F03RB.
Still further, the low dropout linear regulator is model BL8078CC3TR50.
The beneficial effects of the invention are as follows:
the invention provides a high-efficiency and high-cost-efficiency temperature acquisition circuit, and the excellent structure and smart design of the temperature acquisition circuit bring multiple beneficial effects; the invention can conveniently convert the collected temperature signal into the PWM signal with the duty ratio changed through the temperature detection thermistor which is precisely selected, such as NCP18XH103F03RB, and the conversion mode has the advantages that the PWM signal can be effectively isolated through the optical coupling element with lower cost and reliability, thereby ensuring that the signal is not influenced by interference and noise during the transmission to the main control MCU.
Furthermore, the PWM signal is more beneficial to the signal reading and processing of the MCU, the duty ratio is changed along with the acquired temperature change due to the fact that the PWM signal has fixed frequency, the MCU can accurately calculate the corresponding temperature value by measuring the change of the duty ratio, and the process of processing and reading the signal is simple, convenient and efficient due to the characteristics of the PWM signal, and meanwhile errors possibly occurring in data transmission are reduced.
Furthermore, the elements adopted by the invention, such as the low-dropout linear voltage stabilizer with the model BL8078CC3TR50, are all standard components which are very easy to obtain in the market, the elements not only ensure the stability and the reliability of the temperature acquisition circuit, but also greatly reduce the production cost.
Drawings
Fig. 1 is a circuit diagram of a temperature acquisition circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize applications of other processes and/or usage scenarios for other materials.
Referring to fig. 1, the present invention provides the following preferred embodiments:
the invention provides a high-voltage isolation region temperature acquisition circuit, which is a circuit scheme capable of accurately monitoring the temperature of a high-voltage isolation region hot spot in a new energy automobile charging and distribution system in real time.
Further, the low dropout linear regulator functions in the circuit to provide a stable supply voltage for the temperature acquisition circuit. The operational amplifiers U1A, U B and U1D cooperate to form a linear triangular wave generating module which can generate triangular wave signals with excellent linearity for subsequent modules. It will be appreciated that the generation of a triangular wave is critical for the overall temperature detection circuit, as it will be combined with the variation brought about by the temperature sensor NTC1, to be converted into a PWM signal for further analysis.
Further, in the temperature detection comparison module, the operational amplifier U1C is connected to the voltage VCC output from the voltage regulator through a resistor R1, and is connected to the high-voltage isolation region OGND through a resistor network formed by R9 and R10 and NTC 1. The resistance of the temperature detection thermistor NTC1 changes with temperature, resulting in a certain functional relationship between the voltage of the inverting input terminal of the operational amplifier U1C and the temperature. Meanwhile, the noninverting input end of the operational amplifier U1C is connected to the output of the triangular wave generating module. It will be appreciated that this configuration allows the detected temperature change to be translated into a change in the duty cycle of the PWM signal. The PWM signal is then isolated for transmission through a photo coupler to ensure safe isolation between the high voltage isolation region and the master MCU.
Through the circuit design provided by the embodiment, not only can the safe and reliable transmission of the temperature information of the high-voltage isolation area be realized, but also the cost benefit and the convenient implementation are realized because the peripheral elements and the complexity are greatly reduced.
Further, in the high-voltage isolation region temperature acquisition circuit envisaged in the present embodiment, the configuration and connection manner of the operational amplifier U1 are critical to achieving the function thereof. In a specific configuration of this embodiment, the operational amplifier U1A serves as an important loop of the triangular wave generating module, and its second pin is connected to both the thirteenth pin and the fourth pin of the operational amplifier U1D to form a reference voltage point, and to the fifth pin of the operational amplifier U1B, serving as a feedback node of the module. The third pin of the operational amplifier U1A forms a self-feedback through the resistor R3, and creates a potential dividing point through the resistors R7 and U1B, which is necessary for stable generation of the triangular wave.
It will be appreciated that the connection of the fourth pin of the operational amplifier U1A is critical because it provides the supply voltage VCC required for operation of the operational amplifier and helps to reduce the effects of supply noise by decoupling the capacitors C1 and C2 from the high voltage isolation region OGND. The sixth pin of the operational amplifier U1B is connected to the first pin of U1A via a resistor R2 and simultaneously to the seventh pin of U1B via a capacitor C4, wherein the resistor R2 and the capacitor C4 together are a critical element affecting the oscillation period.
Further, the operational amplifier U1D provides a reference voltage in the circuit, twelve pins of the operational amplifier are respectively connected to the ground OGND through a resistor R11 and to the VCC through a resistor R4, and a voltage dividing resistor link of the R4 and the R11 is formed, so that the purpose of outputting VCC/2 from four pins of the U1D is achieved. This configuration ensures that U1D can stably output a constant VCC/2 voltage as a reference point for the triangular wave generation module.
Through the circuit design provided by the embodiment, the system not only can effectively generate the required triangular wave signals, but also can accurately measure and convert temperature information into PWM signals under different temperature conditions. This conversion simplifies the secure transmission of high voltage isolation zone temperature information while maintaining low cost and high reliability of the system. The temperature change is converted into the change of the duty ratio, so that the temperature is digitally output, the processing and analysis of the temperature information by the main control MCU can be simplified, and the performance and practicability of the whole system are improved.
Further, in this embodiment, the selected one-chip four operational amplifier U1 adopts a device with a model LMV324, which is suitable for application scenarios requiring low-voltage operation and low power consumption, and the low-dropout linear regulator also supports power supply in a wide voltage range for providing power for the circuit, so as to adapt to different working environments; on the basis, the comparison triangular wave signal output by the operational amplifier U1C is compared with a reference voltage formed by temperature change detected by the temperature detection thermistor NTC1 in the temperature acquisition circuit between nine pins and ten pins of the U1C, and a temperature pulse width modulation signal is generated according to the comparison result.
Further, the resistor R1 is selected to be 5.1kΩ, which plays a key role in current limiting and signal level setting in the circuit. The resistors R9 and R10 are precise resistors with the size of 51Ω, and are used as current sampling and voltage dividing elements, and the low resistance of the resistors helps to maintain the integrity of signals in the circuit and minimize the interference of the signals. It can be understood that R9 and R10 play a role in constructing the voltage reference point of the operational amplifier U1C in the circuit, so as to ensure the temperature detection precision under the stable operation of the circuit.
Further, the capacitance C6 used in this embodiment has a capacitance of 100nF, and this capacitance is configured to form a filter network at the inverting input to smooth the input signal and suppress possible high frequency noise. C6 and resistors R9 and R10 form a low-pass filter, which is beneficial to the stability of signals and the influence caused by environmental interference.
Further, through element type selection and parameter setting, the temperature acquisition circuit provided by the embodiment can acquire and process the temperature change condition in the high-voltage isolation area in real time with high precision, so that efficient transmission of temperature information is realized. In addition, the adoption of carefully selected elements ensures the stability and long-term reliability of the circuit, is an ideal choice for temperature monitoring in a high-pressure environment, and can create an economical and efficient temperature monitoring system for new energy automobiles and other applications.
Further, in the temperature acquisition circuit of the high-voltage isolation region described in this embodiment, the resistance and capacitance of the plurality of key resistive and capacitive elements are specifically configured. In the temperature acquisition circuit, the resistor R2 is selected to be 13KΩ, and the capacitor C4 is 100nF, so that the resistor R2 acts as a timing element in the triangular wave generation circuit module, and the length of the oscillation period is determined.
Further, the resistance of the resistor R3 is selected to be 36kΩ, which is used as an element in the self-feedback path of the operational amplifier U1A, to help set the gain of the operational amplifier and the stability of the feedback. The resistors R4, R7 and R11 are respectively 51KΩ, 33KΩ and 51KΩ, which respectively bear different functions in the circuit, for example, R4 and R11 are used to form the reference voltage resistor voltage division of VCC/2 of the operational amplifier U1D, the resistor R7 participates in the cross-linking positive feedback coupling between the two operational amplifier modules U1A and U1B, and meanwhile, the proportional relation of the resistance values of R7 and R3 also determines the magnitude of the triangular wave amplitude output by the seven pins of U1B, and the configuration of all the resistors is an important basis for ensuring that the circuit can work normally under preset parameters.
Further, the selection of the capacitors C1 and C4 is 100nF, and the capacitors respectively play different roles in the circuit; wherein the capacitor C1 is connected in parallel with the capacitor C2 to form a filter network which helps to provide a stable supply voltage for the whole circuit, and the capacitor C4 together with the resistor R2 provides a timing reference for the oscillating loop for influencing the oscillating frequency of the circuit. The capacitance value of the capacitor C2 is 4.7uF, and the capacitor C1 is connected in parallel, so that a more effective filtering effect is exerted in power supply decoupling, possible voltage transient and noise are restrained, and key performance requirements such as circuit stability and response speed are met.
It should be understood that, through these carefully selected configurations of the resistance and capacitance, the embodiment pursues detailed management in design, and greatly optimizes the response accuracy and stability of the circuit to temperature changes, and such a configuration not only improves the reliability of the temperature monitoring circuit, but also brings a certain degree of interference immunity to the whole system, which is an effective supplement and reinforcement to the circuit design.
The selection of the component values and the circuit configuration method provided by the embodiment are beneficial to realizing a high-precision temperature acquisition circuit matched with the requirements of a high-voltage isolation area, and the circuit design allows rapid and accurate acquisition of temperature information under severe conditions, so that the method is a precondition for ensuring the stability and safety of the whole system for a high-voltage system needing real-time monitoring and ensuring safe operation.
Further, to ensure that the temperature acquisition circuit is able to efficiently transfer signals from the high voltage isolation region to the low voltage logic level region, an optocoupler is employed to achieve electrical isolation. The optocoupler has 4 pins, and in its connected configuration, the first pin is connected to the output of the operational amplifier U1C through a resistor R5, so as to receive the temperature pulse width modulated signal output by the operational amplifier U1C.
Further, the second pin of the optocoupler is directly connected to the digital output driving ground OGND to form a stable reference ground, while the third pin is grounded to ensure electrical isolation between the signal paths. For the fourth pin, the fourth pin is connected to a 3.3V direct current voltage source through a resistor R6, so that necessary working voltage is provided for the photoelectric coupler, and stable transmission of signals is ensured.
It should be understood that the fourth pin of the optocoupler not only serves as a power pin, but also is an output of the isolated temperature pulse width modulated signal. The signal from the output is transmitted to the vehicle charger via the resistor R8. The resistor R8 not only plays a role in signal transmission, but also forms a filter network through the second end and the capacitor C5 in a grounding way, so that the high-frequency interference possibly encountered in the signal transmission process is further reduced, and the signal quality is improved.
Furthermore, it is understood that the filter network is critical to the shaping and denoising of signals, and particularly applied in a high-voltage isolation region environment, so that the sensitivity and the reaction speed of the system to temperature change capture can be improved. By the embodiment, measurement errors caused by electric noise during vehicle charging can be effectively restrained, so that the accuracy and reliability of the whole temperature acquisition circuit are ensured, and a solution for safe and accurate temperature monitoring in a high-voltage environment is provided, which has important technical advantages for vehicle-mounted systems requiring strict temperature control.
Further, the embodiment refines specific models and parameters of some key elements in the temperature acquisition circuit, and in order to ensure effective isolation from a high-voltage isolation area and transmit a temperature pulse width modulation signal, a type of LTV-817 photocoupler is selected, and the type of photocoupler is commonly used in various circuit designs due to its reliable performance and moderate price so as to meet the requirements of isolation security and signal transmission.
Further, a resistor R5 is used as a component connecting the output terminal of the operational amplifier U1C and the first pin of the photocoupler, and the resistance value thereof is selected to be 2kΩ. The selection of such a specific value helps to control the LED drive current of the optocoupler, ensuring efficient conversion of the signal within the optocoupler. The resistor R6 is connected between the fourth pin of the photoelectric coupler and the 3.3V direct current voltage source, the resistance value of the resistor R6 is 10KΩ, current limiting protection is provided, stable working voltage is provided, and the photoelectric coupler is prevented from being damaged by overcurrent.
Further, as for the selection of the resistors R5 and R6, it is to be understood that they not only have current limiting and stabilizing effects, but also cooperate with the electrical characteristics of the optocoupler to ensure high efficiency and stability of the signal conversion process.
Further, the resistance value of the resistor R8 connected to the vehicle-mounted charger is 1KΩ, the capacitance value of the capacitor C5 is 1nF, and the resistor R8 is matched with the capacitor C5, so as to filter out high-frequency interference components possibly existing in the signal transmission path, thereby ensuring the purity of the transmission signal and the accuracy of the measurement result.
It will be appreciated that the resistor and capacitor values selected in this embodiment provide the temperature acquisition circuit with more excellent performance and higher signal fidelity. By the element parameter configuration method provided by the embodiment, rapid and accurate temperature signal transmission can be realized, the reliability and stability of the whole circuit under high-pressure conditions are further improved, and a simple, convenient and reliable solution is provided for the field.
The embodiment further describes a specific connection method and an auxiliary element configuration of the low dropout linear regulator in the temperature acquisition circuit, in which the selected low dropout linear regulator is used to stabilize the 13.5V dc power supply to the required operating voltage VCC for the entire temperature acquisition circuit. In order to ensure the stability of the power supply and reduce the power supply noise, the second pin of the low dropout linear regulator is directly connected to the 13.5V dc power supply through a circuit, the first pin is grounded to the circuit, and the third pin is used for outputting a stable voltage VCC to supply power to the circuit.
Further, in order to enhance the stability of the power supply and reduce the high frequency noise that may occur on the power supply line, a capacitor C3 is connected across the first pin and the second pin of the low dropout linear regulator, and the capacitance value of the capacitor C3 is determined to be 4.7uF. This configuration helps in practical applications to smooth the power supply input, eliminate spikes or transient noise caused by input voltage variations, and ensure high quality of the voltage output.
It will be appreciated that the capacitor C3 between the input of the low dropout linear regulator and ground provides the necessary power decoupling, helps to suppress electromagnetic interference caused by power supply variations, improves the stability and anti-interference capability of the circuit as a whole, and such a design is particularly important for precision and stable operation of the temperature acquisition circuit, especially where temperature monitoring has stringent requirements for power and precision.
By the design of the embodiment, the robustness of the power supply part is obviously improved, so that stable and reliable voltage supply is provided for the temperature acquisition circuit, meanwhile, the accuracy and reliability of temperature measurement data are ensured, and the method is particularly critical to an application environment requiring high-precision monitoring and control.
Further, the present embodiment defines a model for a temperature detection thermistor in a temperature acquisition circuit in which an NTC thermistor of model NCP18XH103F03RB is selected as a key element for detecting and responding to temperature changes. By its special material and design, this thermistor is able to change its resistance value upon temperature changes, thereby generating a temperature-dependent voltage signal, which is then converted into a duty-cycle-varying pulse width modulated signal for processing and analysis.
Further, the NTC thermistor of the model NCP18XH103F03RB was selected because it not only has good temperature sensitivity and faster response time, but also provides stable performance over a wide temperature range. The thermistor has higher precision and high reliability, is an ideal choice for temperature detection, and is particularly suitable for industrial and consumer electronic products with strict requirements on temperature control.
It will be appreciated that the type of thermistor is selected based on its performance in a particular application, including consideration of various aspects of temperature resistance, size, long term stability, and cost effectiveness. Selecting the NCP18XH103F03RB model means that the circuit design can be optimized and performance and reliability under different operating environments can be ensured.
Through the thermistor specified by the embodiment, the accuracy and the response speed of the whole temperature acquisition circuit can be guaranteed, and the high efficiency and the accuracy of temperature data acquisition and processing are ensured. The system not only remarkably improves the overall performance of the temperature monitoring system, but also provides powerful support for ensuring the safe operation of related equipment.
Further, the present embodiment defines the model of the low dropout linear regulator employed in the temperature acquisition circuit and describes its application in the circuit. In the circuit, a voltage stabilizer with the model BL8078CC3TR50 is selected and used for stably converting an input 13.5V direct current power supply into a working voltage VCC required by the circuit.
Further, the low dropout linear regulator is an ideal choice for the temperature acquisition circuit not only because it can provide an input and an output that can operate at very low dropout, but also because it has excellent voltage and load regulation characteristics.
It can be understood that the low dropout linear voltage regulator of BL8078CC3TR50 model is selected and used, which is not only important for keeping the stable operation of the circuit, but also has significant influence on keeping the accuracy of temperature acquisition. The regulated output voltage VCC of the voltage regulator is the basis for proper operation and accurate measurement of the circuit, especially in complex or harsh operating environments.
Through the voltage stabilizer selection of the embodiment, the temperature acquisition circuit can more effectively respond to the environmental temperature change and accurately measure, and the reliability of data and the accuracy of system control are ensured. The low dropout linear voltage regulator of the model provides important guarantee for temperature monitoring and related application due to excellent performance and reliable design, thereby greatly improving the overall performance and safety of the system.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (7)
1. The utility model provides a high voltage isolation district temperature acquisition circuit which characterized in that, high voltage isolation district temperature acquisition circuit includes: a low dropout linear voltage regulator, an operational amplifier, a photoelectric coupler and a temperature detection thermistor NTC1;
the operational amplifier is a one-piece four-operational amplifier U1, and comprises an operational amplifier U1A, an operational amplifier U1B, an operational amplifier U1C and an operational amplifier U1D, wherein the operational amplifier U1A, the operational amplifier U1B and the operational amplifier U1D are used as triangular wave generation modules, and the operational amplifier U1C and the temperature detection thermistor NTC1 are used as temperature detection comparison modules;
the ninth pin of the operational amplifier U1C is connected with the output voltage VCC of the low-dropout linear voltage regulator through a resistor R1, and is also connected with the first end of a resistor R9, the second end of the resistor R9 is connected with a digital output driving ground OGND through a capacitor C6, and the second end of the resistor R9 is also connected with a high-voltage isolation region ground OGND through a resistor R10 and the temperature detection thermistor NTC1 which are connected in series;
the tenth pin of the operational amplifier U1C is connected to the seventh pin of the operational amplifier U1B, and the seventh pin of the operational amplifier U1B is used as the output of the triangular wave generating module to output triangular waves;
the eighth pin of the operational amplifier U1C is used as output, and a temperature pulse width modulation signal is output to the photoelectric coupler;
the second pin of the operational amplifier U1A is connected with the thirteenth pin and the fourth pin of the operational amplifier U1D, and is also connected with the 5 th pin of the operational amplifier U1B, the third pin of the operational amplifier U1A is connected with the first pin thereof via a resistor R3, and is also connected with the 7 th pin of the operational amplifier U1B via a resistor R7, the fourth pin of the operational amplifier U1A is connected with the output voltage VCC of the low dropout linear regulator, and is also connected with the high voltage isolation region OGND via parallel filter capacitors C1 and C2, and the eleventh pin of the operational amplifier U1A is connected with the high voltage isolation region OGND;
the sixth pin of the operational amplifier U1B is connected with the first pin of the operational amplifier U1A through a resistor R2 and is also connected with the seventh pin of the operational amplifier U1A through a capacitor C4;
twelve pins of the operational amplifier U1D are connected with the digital output driving ground OGD through a resistor R11 and are also connected with the output voltage VCC of the low dropout linear voltage regulator through a resistor R4;
the first pin of the photoelectric coupler is connected to the output end of the operational amplifier U1C through a resistor R5, the second pin of the photoelectric coupler is connected with the digital output driving ground OGND, the third pin of the photoelectric coupler is grounded, and the fourth pin of the photoelectric coupler is connected with 3.3V direct-current voltage through a resistor R6;
the fourth pin of the photoelectric coupler is used as output, an isolated temperature pulse width modulation signal is output and transmitted to the control panel MCU chip for sampling through the resistor R8, and the second end of the resistor R8 is grounded through the capacitor C5.
2. The high voltage isolation region temperature acquisition circuit according to claim 1, wherein the model of the one-chip four operational amplifier U1 is LMV324, the resistance of the resistor R1 is 5.1kΩ, the resistance of the resistor R9 is 51Ω, the resistance of the resistor R10 is 51Ω, and the capacitance of the capacitor C6 is 100nF.
3. The high-voltage isolation region temperature acquisition circuit according to claim 1, wherein the resistance of the resistor R2 is 13kΩ, the resistance of the resistor R3 is 36kΩ, the resistance of the resistor R4 is 51kΩ, the resistance of the resistor R7 is 33kΩ, the resistance of the resistor R11 is 51kΩ, the capacitance of the capacitor C1 is 100nF, the capacitance of the capacitor C2 is 4.7uF, and the capacitance of the capacitor C4 is 100nF.
4. The high voltage isolation region temperature acquisition circuit of claim 1, wherein the optocoupler is of the type LTV-817, the resistor R5 is 2kΩ, the resistor R6 is 10kΩ, the resistor R8 is 1kΩ, and the capacitor C5 is 1nF.
5. The high voltage isolation region temperature acquisition circuit according to claim 1, wherein a second pin of the low dropout linear regulator is connected to a 13.5V dc power supply, a first pin thereof is grounded, and a third pin thereof outputs a voltage VCC;
and a capacitor C3 with a capacitance value of 4.7uF is connected between the first pin and the second pin of the low dropout linear voltage regulator in a bridging way.
6. The high voltage isolation region temperature acquisition circuit of claim 1, wherein the temperature detection thermistor NTC1 is model number NCP18XH103F03RB.
7. The high voltage isolation region temperature acquisition circuit of claim 1, wherein the low dropout linear regulator is model BL8078CC3TR50.
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