Temperature switching circuit of electronic component module and electronic component module with mode switching function

Abstract

The utility model relates to the technical field of aging modules, and provides a temperature switching circuit of an electronic component module and an electronic component module with a mode switching function, the temperature switching circuit comprises a temperature acquisition module, a heating module and a switching module, the heating module is used for heating the environment where the electronic component module is located, and the switching module is used for switching the mode of the electronic component module. The temperature acquisition module is used for acquiring environment temperature, the switching module is used for controlling the heating module according to temperature requirements, the temperature acquisition module is a thermistor, the switching module comprises a comparator, one input end of the comparator is connected with a voltage division circuit where the thermistor is located, and the other input end of the comparator is connected with a voltage division circuit where the temperature adjusting resistor is located. The temperature adjusting resistor comprises a first resistor and a second resistor, the first resistor is connected to the two ends of the second resistor in parallel through a controllable switch, and the controllable switch is used for being disconnected when the electronic element module needs to be in a working mode and used for being connected when the electronic element module needs to be in an aging mode, so that accurate temperature adjustment of the heating module is achieved.

Description

Technical Field

[0001] This utility model relates to the field of aging module technology, specifically to a temperature switching circuit for an electronic component module and an electronic component module with mode switching function. Background Technology

[0002] Some existing electronic component modules (such as capacitors, diodes, and electricity meters) are initially unstable in performance, with a higher probability of failure during this initial stage. However, after a period of use, as the electronic component modules begin to age, they enter a long period of stability, typically lasting from several years to over a decade. During this stable period, the performance of the electronic component modules remains almost unchanged, and the probability of failure is significantly reduced compared to when they were first used. Therefore, during the production of electronic component modules, an aging process is performed on the components to ensure stable operation over a long period.

[0003] like Figure 1 The image shows an aging device for a 0.01-grade standard energy meter module in the prior art. Based on this device, a commonly used aging scheme for standard energy meters involves connecting the reference diode in the module to be aged to an external power source, placing the energized module in a high-temperature chamber, and energizing it at 105°C for 1000 or 2000 hours to achieve aging. However, in this scheme, the high-temperature chamber can only provide an aging environment of 105°C for the standard energy meter. After aging is complete, the module needs to be removed, and a 45°C working environment needs to be provided for stable operation, making the process rather cumbersome.

[0004] To address the limitation of existing high-temperature chambers that can only provide a single, fixed temperature, Chinese patent document CN214201671U discloses a control heating system with hysteresis loop transmission characteristics. This system includes a temperature acquisition circuit for acquiring the temperature of the chip being heated, a constant-temperature control module for adjusting the temperature, and a heating module for heating the chip. In the patent document, the temperature acquisition circuit uses a thermistor to acquire the chip temperature in real time and changes its resistance value according to the temperature, with the voltage value across the thermistor changing accordingly. In the constant-temperature control module, an operational amplifier acquires the voltage across the thermistor as the positive input and the voltage across a sliding rheostat connected in parallel with the thermistor as the negative input. Switching between different heating temperatures is achieved by adjusting the resistance value of the sliding rheostat. This solution solves the problem that high-temperature chambers can only provide heating at a single temperature and cannot adapt to more application scenarios. However, in this patent document, the resistance value of the sliding rheostat needs to be adjusted to regulate the heating temperature of the heating module. If the sliding rheostat is not adjusted properly, the heating module may not be able to provide an accurate heating temperature to the chip. Utility Model Content

[0005] The purpose of this invention is to provide a temperature switching circuit for an electronic component module and an electronic component module with mode switching function, so as to solve the problem in the prior art that it is not easy to accurately adjust to the corresponding temperature when switching the working mode of the heating module.

[0006] This utility model provides a temperature switching circuit for an electronic component module to solve the above-mentioned technical problems. It includes a temperature acquisition module, a heating module, and a switching module. The heating module heats the environment in which the electronic component module is located. The temperature acquisition module acquires the ambient temperature. The switching module controls the heating module according to temperature requirements. The temperature acquisition module is a thermistor. The switching module includes a comparator. One input of the comparator is connected to a voltage divider circuit containing the thermistor, and the other input is connected to a voltage divider circuit containing a temperature regulating resistor. The temperature regulating resistor includes a first resistor and a second resistor. The first resistor is connected in parallel across the second resistor via a controllable switch. The controllable switch is open when the electronic component module needs to be in operating mode and closed when the electronic component module needs to be in aging mode. The resistance of the second resistor is equal to the resistance of the thermistor at the operating mode temperature, and the resistance of the first and second resistors connected in parallel is equal to the resistance of the thermistor at the aging mode temperature.

[0007] Furthermore, the voltage divider circuit containing the thermistor and the voltage divider circuit containing the temperature regulating resistor form a bridge circuit. In this bridge circuit, the thermistor is connected in series with the first current-limiting resistor, and the temperature regulating resistor is connected in series with the second current-limiting resistor. The two series circuits are connected in parallel between the power supply and ground. The two input terminals of the comparator are respectively connected to the connection point of the thermistor and the first current-limiting resistor and the connection point of the temperature regulating resistor and the second current-limiting resistor.

[0008] Furthermore, the heating module is installed on the substrate where the electronic component module is located to heat the environment where the electronic component module is located. The heating module includes a resistance heater, and a heating control switch is provided in the power supply circuit of the resistance heater. The heating control switch is connected to the output terminal of the comparator and is controlled by the output terminal of the comparator.

[0009] Furthermore, a filter current limiting circuit is provided between the output terminal of the comparator and the heating control switch, and the filter current limiting circuit adopts an RC filter circuit.

[0010] An electronic component module with mode switching function includes an electronic component module mounted on a substrate and a temperature switching circuit that provides a specific temperature environment for the electronic component module. The temperature switching circuit includes a temperature acquisition module, a heating module, and a switching module. The temperature acquisition module is a thermistor. Both the heating module and the temperature acquisition module are mounted on the substrate. The switching module includes a comparator. One input terminal of the comparator is connected to a voltage divider circuit containing the thermistor, and the other input terminal is connected to a voltage divider circuit containing a temperature regulating resistor. The output terminal of the comparator controls the connection to the heating module. The temperature regulating resistor includes a first resistor and a second resistor. The first resistor is connected in parallel across the second resistor via a controllable switch. The controllable switch is used to open when the electronic component module needs to be in operating mode and to close when the electronic component module needs to be in aging mode. The resistance value of the second resistor is equal to the resistance value of the thermistor at the operating mode temperature, and the resistance value of the first resistor and the second resistor connected in parallel is equal to the resistance value of the thermistor at the aging mode temperature.

[0011] Furthermore, a heat insulation layer is provided around the substrate.

[0012] Furthermore, the voltage divider circuit containing the thermistor and the voltage divider circuit containing the temperature regulating resistor form a bridge circuit. In this bridge circuit, the thermistor is connected in series with the first current-limiting resistor, and the temperature regulating resistor is connected in series with the second current-limiting resistor. The two series circuits are connected in parallel between the power supply and ground. The two input terminals of the comparator are respectively connected to the connection point of the thermistor and the first current-limiting resistor and the connection point of the temperature regulating resistor and the second current-limiting resistor.

[0013] Furthermore, the heating module is installed on the substrate where the electronic component module is located to heat the environment where the electronic component module is located. The heating module includes a resistance heater, and a heating control switch is provided in the power supply circuit of the resistance heater. The heating control switch is connected to the output terminal of the comparator and is controlled by the output terminal of the comparator.

[0014] Furthermore, a filter current limiting circuit is provided between the output terminal of the comparator and the heating control switch, and the filter current limiting circuit adopts an RC filter circuit.

[0015] Furthermore, the resistance heater includes at least one heating resistor, each of which is disposed on a substrate.

[0016] The beneficial effects of this invention are as follows: By setting the temperature regulating resistor as two resistors connected in parallel through a controllable switch, this invention provides two modes for the temperature switching circuit. The resistance of the second resistor is equal to the resistance of the thermistor at the operating mode temperature, and the resistance of the first and second resistors connected in parallel is equal to the resistance of the thermistor at the aging mode temperature. When the electronic component module needs to be in operating mode, the control switch is open. The comparator controls the heating module by comparing the electrical signals on the second resistor and the thermistor. When the thermistor senses a temperature lower than the operating mode temperature, its resistance is higher than the second resistor's resistance, and the comparator controls the heating module to start heating, bringing it to the operating mode temperature. When the electronic component module needs to be in aging mode, the control switch is closed. The comparator controls the heating module by comparing the electrical signals on the temperature regulating resistor (composed of the first and second resistors connected in parallel) and the thermistor's resistance. When the thermistor senses a temperature lower than the aging mode temperature, its resistance is higher than the temperature regulating resistor's resistance, and the comparator controls the heating module to start heating, bringing it to the aging mode temperature. Since the resistance values ​​of the first resistor and the parallel resistance values ​​of the first and second resistors are pre-set according to the required temperatures of the two modes, during use, the resistance value of the temperature regulating resistor can be adjusted to the resistance value of the thermistor at the corresponding temperature of the required mode simply by switching the control switch. The electrical signals on the thermistor and the temperature regulating resistor are compared by the comparator to control the heating module to heat up or stop working, thereby achieving precise temperature control. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the aging process of a reference voltage source module in the prior art;

[0018] Figure 2 This is a schematic diagram of the switching device for the working mode and aging mode of the standard energy meter in this utility model. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0020] This invention utilizes a control switch to open or close based on externally input control information, thereby controlling the first and second resistors to disconnect or connect in parallel, achieving precise temperature control of the heating module.

[0021] Implementation of Temperature Switching Circuit for Electronic Component Modules

[0022] like Figure 2As shown, this utility model proposes a temperature switching circuit for an electronic component module, including a temperature acquisition module, a heating module, and a switching module. The heating module is used to heat the environment in which the electronic component module is located, providing a stable temperature environment for the electronic component module; the temperature acquisition module is used to acquire the ambient temperature, and a negative temperature coefficient thermistor can be used; the switching module is used to control the heating module according to the temperature requirements.

[0023] The switching module includes a comparator U1. One input of comparator U1 is connected to the voltage divider circuit containing the thermistor NTC1, and the other input is connected to the voltage divider circuit containing the temperature regulating resistor. The temperature regulating resistor includes a first resistor R3 and a second resistor R4. The first resistor R3 is connected in parallel across the second resistor R4 via a controllable switch K1. The controllable switch K1 is used to open when the electronic component module needs to be in working mode and to close when the electronic component module needs to be in aging mode. Comparator U1 controls the heating module based on the electrical signals collected from the temperature regulating resistor and the thermistor NTC1. When the resistance values ​​of the temperature regulating resistor and the thermistor NTC1 are equal, the inputs at both ends of comparator U1 are the same. At this time, the ambient temperature inside the heating module reaches the required temperature, and no further control of the heating module is needed; comparator U1 then controls the heating module to stop heating. Since the resistance value of the thermistor NTC1 changes with the ambient temperature inside the heating module, the heating module can be controlled by setting different resistance values ​​for the temperature regulating resistor. As one embodiment, this invention sets a working mode and an aging mode, each corresponding to a different temperature. In the operating mode, the voltage across the second resistor R4 and the voltage across the thermistor NTC1 are used as inputs to comparator U1. The resistance of the second resistor R4 is equal to the resistance of the thermistor at the corresponding temperature in the operating mode. In the aging mode, the voltage across the parallel circuit of the first resistor R3 and the second resistor R4 and the voltage across the thermistor NTC1 are used as inputs to comparator U1. The resistance of the parallel circuit of the first resistor R3 and the second resistor R4 is equal to the resistance of the thermistor NTC1 at the corresponding temperature in the aging mode.

[0024] To prevent excessive current from flowing through the temperature-regulating resistor and thermistor NTC1, a first current-limiting resistor R2 and a second current-limiting resistor R1 are respectively installed in the voltage divider circuits containing the thermistor NTC1 and the temperature-regulating resistor. These components form a bridge circuit. Thermistor NTC1 is connected in series with the first current-limiting resistor R2, and the temperature-regulating resistor is connected in series with the second current-limiting resistor R1. The input of comparator U1 is acquired from the connection points of thermistor NTC1 and the first current-limiting resistor R2, and the connection point of the temperature-regulating resistor and the second current-limiting resistor R1, respectively. The resistance values ​​of the first current-limiting resistor R1 and the second current-limiting resistor R2 are equal; in one embodiment, the resistance values ​​of the first current-limiting resistor R1 and the second current-limiting resistor R2 are 10kΩ.

[0025] A heating module is mounted on the substrate containing the electronic component module and is primarily used to heat the environment surrounding the module. This module includes a resistance heater, and a heating control switch is integrated into the power supply circuit of the heater. The heating control switch is connected to the output of comparator U1 and is controlled by the output of comparator U1. In one embodiment, the heating control switch can be a transistor Q1. The base of transistor Q1 is connected to comparator U1, the collector of transistor Q1 is connected to one end of the resistance heater, and the emitter of transistor Q1 is grounded. The other end of the resistance heater is connected to the power supply VH. A filter and current-limiting circuit, employing a resistive-capacitive filter, is also provided between the comparator output and the heating control switch.

[0026] In operation, if the control signal input is in working mode, the controllable switch K1 is disconnected under the control signal command, and the first resistor R3 is not connected to the circuit. At this time, the positive input terminal of comparator U1 samples the voltage value on the thermistor NTC1, and the negative input terminal of comparator U1 samples the voltage value on the second resistor R4. When the temperature in the heating module is lower than the set temperature of the working mode, the current resistance value of the thermistor NTC1 is greater than its resistance value at the working mode temperature, while the resistance value of the second resistor R4 is equal to the resistance value of the thermistor NTC1 at the working mode temperature. Therefore, the current resistance value of the thermistor NTC1 is greater than the resistance value of the second resistor R4, and the current voltage on the thermistor NTC1 is greater than the voltage on the second resistor R4. That is, the signal input to the positive input terminal of comparator U1 is greater than the signal input to the negative input terminal. Therefore, comparator U1 outputs a high level, transistor Q1 conducts, and the heating module starts heating. As the temperature in the heating module continues to rise, the resistance of the thermistor NTC1 continuously decreases. When the resistance of the thermistor NTC1 equals the resistance of the second resistor R4, the voltages collected by the positive and negative input terminals of comparator U1 are consistent. Then, comparator U1 outputs a low level, transistor Q1 is disconnected, the entire heating circuit is broken, and the heating module stops heating.

[0027] If the control signal input is in aging mode, the controllable switch K1 closes under the control signal command, and the first resistor R3 and the second resistor R4 are connected in parallel. At this time, the positive input terminal of comparator U1 acquires the voltage value on the thermistor NTC1, and the negative input terminal of comparator U1 acquires the voltage values ​​on the second resistor R4 and the first resistor R3. When the temperature in the heating module is lower than the set temperature of the aging mode, the current resistance value of the thermistor NTC1 is greater than the resistance value of the thermistor NTC1 at the aging mode temperature. Therefore, the current resistance value of the thermistor NTC1 is greater than the resistance value of the temperature regulating resistor (i.e., the first resistor R3 and the second resistor R4 connected in parallel), and the current voltage value on the thermistor is greater than the voltage value of the temperature regulating resistor. That is, the input signal at the positive input terminal of comparator U1 is greater than the input signal at the negative input terminal. Comparator U1 outputs a high level, transistor Q1 conducts to connect the heating circuit, and the heating module starts heating. As the ambient temperature in the heating module continuously rises, the resistance of the thermistor NTC1 continuously decreases. When the resistance of the thermistor NTC1 equals the resistance of the temperature regulating resistor, the signals acquired by the positive and negative input terminals of comparator U1 are consistent, comparator U1 outputs a low level, transistor Q1 is turned off, the heating circuit is broken, and the heating module stops heating. Since the second resistor R4 is connected in parallel with the first resistor R3, its resistance is less than that of the second resistor R4. Therefore, the heating module needs to be heated to a higher temperature to make the resistance of the negative temperature coefficient thermistor even smaller, so that the inputs of the positive and negative input terminals of comparator U1 can reach a balanced state. As one embodiment, the operating mode temperature is set to 45°C, and the aging mode temperature is set to 105°C.

[0028] As can be seen, this utility model only requires a controllable switch to control the resistance value of the temperature regulating resistor, thereby achieving precise temperature control of the heating module.

[0029] Implementation of electronic component modules with mode switching function

[0030] This invention proposes an electronic component module with mode switching function, including electronic components mounted on a substrate and a temperature switching circuit that provides a specific temperature environment for the electronic components. The temperature switching circuit includes a temperature acquisition module, a heating module, and a switching module. The heating module is used to heat the environment in which the electronic component module is located. The temperature acquisition module is used to acquire the ambient temperature. The switching module is used to control the heating module according to temperature requirements. The temperature acquisition module is a thermistor. Both the heating module and the temperature acquisition module are mounted on the substrate. The switching module includes a comparator. One input terminal of the comparator is connected to a voltage divider circuit containing the thermistor, and the other input terminal is connected to a voltage divider circuit containing a temperature regulating resistor. The temperature regulating resistor includes a first resistor and a second resistor. The first resistor is connected in parallel across the second resistor via a controllable switch. The controllable switch is used to open when the electronic component module needs to be in working mode and to close when the electronic component module needs to be in aging mode. The resistance value of the second resistor is equal to the resistance value of the thermistor at the temperature corresponding to the working mode. The resistance value of the first resistor and the second resistor connected in parallel is equal to the resistance value of the thermistor at the temperature corresponding to the aging mode.

[0031] The substrate is primarily used to transfer the heat generated by the heating module to the surrounding electronic components, providing them with heat. The substrate can be a metal substrate with good thermal conductivity; in one embodiment, this invention uses a copper substrate. To prevent heat loss, an insulation layer is provided around the substrate, forming a closed space. In another embodiment, in this invention, a layer of insulation cotton is wrapped around the substrate, and the electronic components, thermistor, and heating module are all enclosed in the insulation cotton.

[0032] To achieve more uniform and rapid heating of the copper substrate, a resistance heater can be composed of multiple resistors connected in series. These resistors are all positioned on the copper substrate, simultaneously transferring heat to it during heating, thus achieving multi-point heating and making the copper substrate more evenly heated. For example... Figure 2 As shown, in one embodiment, resistors R6, R7, R8, R9 and R10 are connected in series to form a resistance heater. When the transistor is turned on, resistors R6, R7, R8, R9 and R10 heat up simultaneously to heat the copper substrate.

[0033] The specific implementation process has been described in detail in the implementation method of the temperature switching circuit of the electronic component module, and will not be repeated here.

Claims

1. A temperature switching circuit for an electronic component module, comprising a temperature acquisition module, a heating module, and a switching module, wherein the heating module is used to heat the environment in which the electronic component module is located, the temperature acquisition module is used to acquire the ambient temperature, and the switching module is used to control the heating module according to temperature requirements, characterized in that... The temperature acquisition module is a thermistor. The switching module includes a comparator. One input of the comparator is connected to the voltage divider circuit where the thermistor is located, and the other input is connected to the voltage divider circuit where the temperature regulating resistor is located. The temperature regulating resistor includes a first resistor and a second resistor. The first resistor is connected in parallel across the second resistor via a controllable switch. The controllable switch is used to open when the electronic component module needs to be in working mode and to close when the electronic component module needs to be in aging mode. The resistance value of the second resistor is equal to the resistance value of the thermistor at the temperature corresponding to the working mode. The resistance value of the first resistor and the second resistor connected in parallel is equal to the resistance value of the thermistor at the temperature corresponding to the aging mode.

2. The temperature switching circuit of the electronic component module according to claim 1, characterized in that, The voltage divider circuit containing the thermistor and the voltage divider circuit containing the temperature regulating resistor form a bridge circuit. In this bridge circuit, the thermistor is connected in series with the first current-limiting resistor, and the temperature regulating resistor is connected in series with the second current-limiting resistor. The two series circuits are connected in parallel between the power supply and ground. The two input terminals of the comparator are respectively connected to the connection point of the thermistor and the first current-limiting resistor and the connection point of the temperature regulating resistor and the second current-limiting resistor.

3. The temperature switching circuit of the electronic component module according to claim 1, characterized in that, The heating module is installed on the substrate where the electronic component module is located and is used to heat the environment where the electronic component module is located. The heating module includes a resistance heater. A heating control switch is provided in the power supply circuit of the resistance heater. The heating control switch is connected to the output terminal of the comparator and is controlled by the output terminal of the comparator.

4. The temperature switching circuit of the electronic component module according to claim 3, characterized in that, A filter and current limiting circuit is also provided between the output of the comparator and the heating control switch. The filter and current limiting circuit adopts a resistor-capacitor filter circuit.

5. An electronic component module with mode switching function, characterized in that, The system includes an electronic component module mounted on a substrate and a temperature switching circuit that provides a specific temperature environment for the electronic component module. The temperature switching circuit includes a temperature acquisition module, a heating module, and a switching module. The temperature acquisition module is a thermistor. Both the heating module and the temperature acquisition module are mounted on the substrate. The switching module includes a comparator. One input terminal of the comparator is connected to a voltage divider circuit containing the thermistor, and the other input terminal is connected to a voltage divider circuit containing a temperature regulating resistor. The output terminal of the comparator controls the connection to the heating module. The temperature regulating resistor includes a first resistor and a second resistor. The first resistor is connected in parallel across the second resistor via a controllable switch. The controllable switch is used to open when the electronic component module needs to be in operating mode and to close when the electronic component module needs to be in aging mode. The resistance value of the second resistor is equal to the resistance value of the thermistor at the operating mode temperature, and the resistance value of the first resistor and the second resistor connected in parallel is equal to the resistance value of the thermistor at the aging mode temperature.

6. The electronic component module with mode switching function according to claim 5, characterized in that, A heat insulation layer is provided around the substrate.

7. The electronic component module with mode switching function according to claim 5, characterized in that, The voltage divider circuit containing the thermistor and the voltage divider circuit containing the temperature regulating resistor form a bridge circuit. In this bridge circuit, the thermistor is connected in series with the first current-limiting resistor, and the temperature regulating resistor is connected in series with the second current-limiting resistor. The two series circuits are connected in parallel between the power supply and ground. The two input terminals of the comparator are respectively connected to the connection point of the thermistor and the first current-limiting resistor and the connection point of the temperature regulating resistor and the second current-limiting resistor.

8. The electronic component module with mode switching function according to claim 5, characterized in that, The heating module is installed on the substrate where the electronic component module is located to heat the environment where the electronic component module is located. The heating module includes a resistance heater. A heating control switch is provided in the power supply circuit of the resistance heater. The heating control switch is connected to the output terminal of the comparator and is controlled by the output terminal of the comparator.

9. The electronic component module with mode switching function according to claim 8, characterized in that, A filter and current limiting circuit is also provided between the output of the comparator and the heating control switch. The filter and current limiting circuit adopts a resistor-capacitor filter circuit.

10. The electronic component module with mode switching function according to claim 8, characterized in that, The resistance heater includes at least one heating resistor, and each heating resistor is disposed on a substrate.

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