PCB component preheating system and method

Abstract

The invention discloses a preheating system and method for components of a PCB. The system comprises a voltage detection module, a temperature acquisition module, a judgment module, a control module and a preheating module. The method comprises the following steps: S1, obtaining a curve of a turn-on voltage threshold value of a PN junction switch type component along with temperature change through a low-temperature test; s2, the temperature of the PCB is acquired by a temperature acquisition module, and a corresponding turn-on voltage threshold value is obtained; s3, pre-estimating whether the voltage of the voltage detection point of the PN junction switch type component after the PCB is powered on can be greater than a turn-on voltage threshold value or not; if yes, judging that the PCB does not need to be preheated, and entering S5; if not, judging that the PCB needs to be preheated, and entering S4; s4, the preheating module heats the PCB until the estimated voltage value of the voltage detection point can be greater than the starting voltage threshold value; and S5, the PCB is powered on. According to the invention, the PCB can be preheated according to needs, and components on the PCB can be ensured not to be influenced by low temperature and can be normally started.

Description

Technical Field

[0001] The invention belongs to the field of preheating components of a PCB board, and in particular relates to a system and method for preheating components of a PCB board. Background Art

[0002] PN junction switch components are widely used in the design of electronic control development hardware. PN junction switch components have a physical characteristic that the voltage characteristic is inversely proportional to the temperature, that is, the lower the temperature, the higher the starting voltage requirement of the PN junction switch components, which causes the PN junction switch components on the controller to be affected by low temperature and cannot be turned on under normal driving voltage. Even if the power is turned on again, the fault cannot be restored. Therefore, a preheating solution is urgently needed to enable the PN junction switch components on the controller to start normally in a low temperature environment. Summary of the invention

[0003] The object of the present invention is to provide a PCB component preheating system and method, which can preheat the PCB as needed to ensure that the components on the PCB are not affected by low temperature and can start normally.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0005] A component preheating system for a PCB board, comprising:

[0006] The voltage detection module is used to detect the voltage value in the component control circuit of the PCB board and send it to the determination module;

[0007] The temperature acquisition module is used to collect the temperature value of the PCB board and send it to the determination module;

[0008] A determination module is used to determine whether the PCB needs to be preheated according to the voltage value sent by the voltage detection module and the temperature value sent by the temperature acquisition module;

[0009] The control module is used to send a first control signal to the preheating module when the determination module determines that the PCB board needs to be preheated;

[0010] The preheating module is used to heat the PCB board according to the first control signal sent by the control module.

[0011] A component preheating system for a PCB board of the present invention can ensure that the temperature of the area where the PN junction switch type components are located is increased in advance in a low temperature environment without affecting the power of the system so that the PCB board can be turned on normally, thereby ensuring the normal operation of the PCB board; compared with the traditional continuous heating method, it can effectively reduce energy consumption, and secondly solves the problem of temperature drift caused by the PN junction switch type components being affected by the high temperature caused by continuous heating in high temperatures in summer.

[0012] Preferably, the components of the PCB board include PN junction switch type components;

[0013] The voltage detection module is also used to set a voltage detection point in the PN junction turn-on control loop of the PN junction switch type component, and detect the voltage value at the voltage detection point.

[0014] Preferably, the determination module is also used to calibrate the turn-on voltage threshold of the PN junction switch type component at various temperatures, and determine whether the voltage value at the voltage detection point of the PN junction switch type component reaches the turn-on voltage threshold of the PN junction switch type component at the corresponding temperature.

[0015] Preferably, the component preheating system further includes a fault detection module;

[0016] The fault detection module is used to detect whether the PN junction switch type components of the PCB board are turned on after the PCB board is powered on; if not, a fault signal is sent to the determination module and the control module;

[0017] The determination module is further configured to update the turn-on voltage threshold of the PN junction switch type component at various temperatures when receiving the fault signal sent by the fault detection module;

[0018] The control module is further configured to send a second control signal to the preheating module when receiving a fault signal sent by the fault detection module;

[0019] The preheating module is also used to heat the PCB board according to the second control signal sent by the control module.

[0020] Preferably, a heating zone is provided on the PCB board; the PN junction switch type component is located on the heating zone;

[0021] The preheating module is also used to heat the PN junction switch type components on the heating area according to the control signal sent by the control module.

[0022] Preferably, the preheating module is a heating resistor.

[0023] The present invention also provides a component preheating method for a PCB board, which is applied to the component preheating system for the PCB board. The component preheating method comprises the following steps:

[0024] Step S1. Obtain the turn-on voltage threshold K of the PN junction switch type component through a low temperature test 标准 Curves that vary with temperature;

[0025] Step S2: The temperature acquisition module acquires the temperature of the PCB board and obtains the corresponding turn-on voltage threshold K of the PN junction switch type component at the temperature. 标准 ;

[0026] Step S3: Estimate whether the voltage at the voltage detection point of the PN junction switch type component after the PCB board is powered on is greater than K 标准 ; If yes, it is determined that the PCB board does not need to be preheated and the process proceeds to step S5; if no, it is determined that the PCB board needs to be preheated and the process proceeds to step S4;

[0027] Step S4. The control module sends a control signal to the preheating module, and the preheating module heats the PCB board until the estimated voltage value of the voltage detection point of the PN junction switch type component after the PCB board is powered on is greater than K 标准 ;

[0028] Step S5: Power on the PCB.

[0029] Preferably, step S1 comprises: selecting N PN junction type standard parts, performing low temperature verification tests on them respectively, obtaining curves of the turn-on voltages of the corresponding N PN junction switch type components changing with temperature, and taking the curve with the highest upper limit of the voltage value as the turn-on voltage threshold value K of the PN junction switch type component. 标准 Curves that vary with temperature.

[0030] Preferably, the component preheating method further includes the following: 标准 Update steps:

[0031] Step S6. After the PCB board is powered on, detect whether the PN junction switch type components of the PCB board are turned on; if so, proceed to step S7; if not, proceed to step S9;

[0032] Step S7. Record the voltage value of the voltage detection point of the PN junction switch type component into the history database, and then return to step S6 to continue recording the voltage value and calculating the average value of all the saved voltage values ​​until the calculated average value of all the saved voltage values ​​is greater than the turn-on voltage threshold K. 标准 Then, proceed to step S8;

[0033] Step S8: Set the start voltage threshold K 标准 The value of is updated to the average value of all saved voltage values, and then returns to step S2;

[0034] Step S9: Continue to heat the PCB until the PN junction switch type components on the PCB are turned on and the turn-on voltage threshold K 标准 The value of is updated to the voltage value of the voltage detection point of the PN junction switch type component at this time, and then returns to step S2.

[0035] Preferably, the step S5 further comprises: after the PCB board is powered on, obtaining the corresponding opening voltage threshold K of the PN junction switch type component according to the temperature collected by the temperature collection module 标准 , and determine whether the voltage value K of the voltage detection point of the PN junction switch type component actually detected by the voltage detection module is greater than K 标准 If so, then K 标准 The value is updated to the voltage value K, and the voltage value K is recorded in the historical database before entering step S6; if not, directly enter step S6.

[0036] Beneficial effects:

[0037] The present invention provides a PCB component preheating system and method. Under the premise of not affecting the power of the system, it can ensure that the temperature of the area where the PN junction switch type components are located is increased in advance in a low temperature environment so that they can be turned on normally, thereby ensuring the normal operation of the PCB board. Compared with the traditional continuous heating method, it can effectively reduce energy consumption, and secondly, it also solves the problem of temperature drift caused by the PN junction switch type components being affected by the high temperature caused by continuous heating in the high temperature in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The figure is a structural block diagram of a component preheating system for a PCB board according to an embodiment;

[0039] Figure 2 The figure shows a schematic diagram of the layout of a PCB board of a component preheating system of a PCB board according to an embodiment;

[0040] Figure 3 The figure shows a schematic diagram of the position of voltage detection points of a component preheating system of a PCB board according to an embodiment;

[0041] Figure 4 Shown is a flow chart of a method for preheating components of a PCB board according to an embodiment;

[0042] Figure 5 Shown is a timing diagram of a method for preheating components of a PCB board according to an embodiment;

[0043] Figure 6 The figure shows the calibration K of step S1 of a method for preheating components of a PCB board in an embodiment. 标准 Process diagram;

[0044] Figure 7 The embodiment of the method for preheating components of a PCB board is shown in step S1. 标准 A schematic diagram of the change curve of

[0045] Figure 8 A schematic diagram of a preheating process of a method for preheating components of a PCB board according to an embodiment is shown.

[0046] Reference numerals

[0047] 10. PCB board; 20. Heating zone; 30. Heating module; 100. Transistor driving signal; 200. Voltage detection point; 300. Control signal. DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0049] The technical solution of the present invention is described in detail below with specific embodiments.

[0050] Embodiment 1

[0051] like Figures 1 to 3 As shown, a component preheating system for a PCB board 10 of this embodiment includes:

[0052] A voltage detection module, used to detect the voltage value in the component control loop of the PCB board 10 and send it to the determination module;

[0053] A temperature acquisition module is used to collect the temperature value of the PCB board 10 and send it to the determination module;

[0054] A determination module, used to determine whether the PCB board 10 needs to be preheated according to the voltage value sent by the voltage detection module and the temperature value sent by the temperature acquisition module;

[0055] A control module, configured to send a first control signal to the preheating module 30 when the determination module determines that the PCB board 10 needs to be preheated;

[0056] The preheating module 30 is used to heat the PCB board 10 according to the first control signal sent by the control module.

[0057] Preferably, the components of the PCB board 10 include PN junction switch type components;

[0058] The voltage detection module is also used to set a voltage detection point 200 in the PN junction turn-on control loop of the PN junction switch type component, and detect the voltage value at the voltage detection point 200.

[0059] Preferably, the determination module is also used to calibrate the turn-on voltage threshold of the PN junction switch type component at various temperatures, and determine whether the voltage value at the voltage detection point 200 of the PN junction switch type component reaches the turn-on voltage threshold of the PN junction switch type component at the corresponding temperature.

[0060] Preferably, the component preheating system further includes a fault detection module;

[0061] The fault detection module is used to detect whether the PN junction switch type components of the PCB board 10 are turned on when the PCB board 10 is powered on; if not, a fault signal is sent to the determination module and the control module;

[0062] The determination module is further configured to update the turn-on voltage threshold of the PN junction switch type component at various temperatures when receiving the fault signal sent by the fault detection module;

[0063] The control module is further configured to send a second control signal to the preheating module 30 when receiving a fault signal sent by the fault detection module;

[0064] The preheating module 30 is further used to heat the PCB board 10 according to the second control signal sent by the control module.

[0065] Preferably, a heating area 20 is provided on the PCB board 10; the PN junction switch type components are located on the heating area 20;

[0066] The preheating module 30 is also used to heat the PN junction switch type components on the heating area 20 according to the control signal sent by the control module.

[0067] Preferably, the preheating module 30 is a heating resistor.

[0068] Specifically, the preheating module 30 is a heating wire.

[0069] Specifically, the present embodiment provides a component preheating system for a PCB board 10, wherein the PCB board 10 is mainly a PCB board 10 used in an automobile controller. When designing the PCB board 10 of the automobile controller, it is necessary to follow Figure 2 As shown, the PN junction switch type components on the PCB board 10 can be concentrated in a concentrated area with copper on the bottom surface and an area of ​​30% of the PCB board. This facilitates temperature heating and has less impact on other components such as the MCU on the PCB board 10.

[0070] Furthermore, the PN junction switch type components are concentratedly placed in the back area, and a proper number of heating resistors or heating wires with programmable current are designed to be added so as to start heating the PN junction switch type components in a low temperature environment.

[0071] Furthermore, the temperature acquisition module of this embodiment can be: adding an ambient temperature sensor outside the housing of the automobile controller or receiving ambient temperature acquisition data of the entire vehicle through a CAN bus, so as to acquire the ambient temperature of the PCB board 10 in real time.

[0072] Furthermore, if Figure 3 As shown, a K value voltage detection point 200 is added in the start-up control loop of the PN junction switch type component to monitor the changes in the K value voltage and the ambient temperature so as to determine the starting voltage threshold of the PN junction switch type component; in addition, the base of the PN junction switch type component inputs a transistor drive signal 100, and the collector inputs a control signal 300.

[0073] Embodiment 2

[0074] like Figures 4 to 8 As shown, this embodiment provides a component preheating method for a PCB board 10, which is applied to the component preheating system for the PCB board 10 of the first embodiment. The component preheating method comprises the following steps:

[0075] Step S1. Obtain the turn-on voltage threshold K of the PN junction switch type component through a low temperature test 标准 Curves that vary with temperature;

[0076] Step S2: The temperature acquisition module acquires the temperature of the PCB board 10 and obtains the corresponding opening voltage threshold K of the PN junction switch type component at the temperature. 标准 ;

[0077] Step S3: Estimate whether the voltage at the voltage detection point 200 of the PN junction switch type component is greater than K after the PCB board 10 is powered on. 标准 ; If yes, it is determined that the PCB board 10 does not need to be preheated and the process proceeds to step S5; if no, it is determined that the PCB board 10 needs to be preheated and the process proceeds to step S4;

[0078] Step S4. The control module sends a control signal to the preheating module 30, and the preheating module 30 heats the PCB board 10 until the estimated voltage value of the voltage detection point 200 of the PN junction switch type component after the PCB board 10 is powered on is greater than K 标准 ;

[0079] Step S5: Power on the PCB board 10.

[0080] Preferably, step S1 comprises: selecting N PN junction type standard parts, performing low temperature verification tests on them respectively, obtaining curves of the turn-on voltages of the corresponding N PN junction switch type components changing with temperature, and taking the curve with the highest upper limit of the voltage value as the turn-on voltage threshold value K of the PN junction switch type component. 标准Curves that vary with temperature.

[0081] Preferably, the component preheating method further includes the following: 标准 Update steps:

[0082] Step S6. After the PCB board 10 is powered on, detect whether the PN junction switch type components of the PCB board 10 are turned on; if so, proceed to step S7; if not, proceed to step S9;

[0083] Step S7. Record the voltage value of the voltage detection point 200 of the PN junction switch type component into the history database, and then return to step S6 to continue recording the voltage value and calculating the average value of all the saved voltage values ​​until the calculated average value of all the saved voltage values ​​is greater than the start voltage threshold K 标准 Then, proceed to step S8;

[0084] Step S8: Set the start voltage threshold K 标准 The value of is updated to the average value of all saved voltage values, and then returns to step S2;

[0085] Step S9: Continue to heat the PCB board 10 until the PN junction switch type components on the PCB board 10 are turned on, and the turn-on voltage threshold K 标准 The value of is updated to the voltage value of the voltage detection point 200 of the PN junction switch type component at this time, and then returns to step S2.

[0086] Preferably, the step S5 further comprises: after the PCB board 10 is powered on, obtaining the corresponding opening voltage threshold K of the PN junction switch type component according to the temperature collected by the temperature collection module 标准 , and determine whether the voltage value K of the voltage detection point 200 of the PN junction switch type component actually detected by the voltage detection module is greater than K 标准 If so, then K 标准 The value is updated to the voltage value K, and the voltage value K is recorded in the historical database before entering step S6; if not, directly enter step S6.

[0087] Specifically, the low temperature test in step S1 of this embodiment refers to a traditional low temperature DV test. The DV test is a prior art and will not be described in detail here.

[0088] Specifically, this embodiment uses the component preheating method of the PCB board 10 to increase the software self-learning function of the component preheating system of the PCB board 10, and obtains the standard threshold value K of the PN junction opening in the specified low temperature DV test of the PN junction type standard part. 标准This standard threshold K can be exported for mass production and written into products. After the product is installed on the vehicle, it will automatically learn and update the standard threshold set for mass production based on the vehicle environment and the performance characteristics of the components themselves. In this way, the heating threshold of the product will be more accurate when it is actually used.

[0089] Furthermore, in the self-learning software algorithm, the update process of the PN junction component startup threshold K is as follows: when the system is powered on for the first time, the collected K value is greater than the standard K value calibrated by the low-temperature test. If the system does not report a fault at this time, the K value data collected at this time will be recorded. When the system is powered on N times, the average value of the previous N collected K values ​​is calculated. When the average value is greater than the startup threshold K 标准 Update K immediately 标准 If the average value of the previous N times is less than K 标准 If the value of k is not found, continue to record the collected k value and average it to update K 标准 The value is the calculated average value.

[0090] Furthermore, before the PCB board 10 is powered on, it is necessary to determine whether to trigger the opening threshold and judge whether the preheating system is turned on based on the temperature sampling of the ambient temperature sensor and the change relationship between the K value.

[0091] Furthermore, if the system detects that the K value is greater than the standard value K determined by the product DV test 标准 , update K immediately 标准 If the value is greater than 0.01 and the system reports a fault, the preheating function is immediately turned on to ensure that the PN junction switch type components start normally and the system operates normally.

[0092] Furthermore, K 标准 The update of the value is started after K is less than K 标准 K value data should be recorded and saved in both the fault and no fault conditions. When the number of starts N ≥ 2, the average value of K data is calculated. If the average value K ≥ K 标准 , then update K immediately 标准 Otherwise, continue to record and save the collected K values, calculate the average value of the saved K value data, and update K 标准 The value is the calculated average value.

[0093] Specifically, in a method for preheating components of a PCB board 10 according to the physical characteristics of PN junction switch components, the lower the ambient temperature, the higher the voltage at the sampling point K. A schematic diagram of the inverse relationship between the K value and the ambient temperature obtained through previous DV experimental tests is shown in FIG. Figure 7 shown.

[0094] Specifically, Figure 8The figure shows the timing diagram of the PN junction concentrated area heating function. In this embodiment, within the first 50ms after the system is powered on, the relationship between the ambient temperature sensor data and the PN junction K value voltage sampling data is combined to determine whether the current environment needs to start the pre-heating function. If it needs to be started, the heating time lasts for 2500ms.

[0095] The present embodiment provides a method for preheating components of a PCB board 10, which provides a preheating solution for ensuring that the PN junction switch components of the controller are not affected by the low temperature and can start normally in a low temperature environment, and first tests and calibrates the writing and then self-learns and updates. The main considerations for not using the continuous heating method are the energy consumption problem and the problem that continuous heating in a high temperature environment in summer can easily cause temperature drift.

[0096] The present invention is applied to a controller with a PN junction switch type component and is applied to all scenarios involving the activation of the PN junction switch function when the system is started in a low temperature environment.

[0097] The strategy of dynamically monitoring the K value for the heating function of the PN junction switch type components in this solution is a method for placing the PN junction switch type components in a specific range of the PCB board 10 to provide heating. The sampling method and self-learning algorithm for the K value are both within this protection range.

[0098] The above is a detailed description of the embodiment of a PCB component preheating system and method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A component preheating system for a PCB board, characterized in that: include: The voltage detection module is used to detect the voltage value in the component control circuit of the PCB board and send it to the determination module; The temperature acquisition module is used to collect the temperature value of the PCB board and send it to the determination module; A determination module is used to determine whether the PCB needs to be preheated according to the voltage value sent by the voltage detection module and the temperature value sent by the temperature acquisition module; The control module is used to send a first control signal to the preheating module when the determination module determines that the PCB board needs to be preheated; The preheating module is used to heat the PCB board according to the first control signal sent by the control module.

2. The component preheating system according to claim 1, characterized in that: The components of the PCB board include PN junction switch type components; The voltage detection module is also used to set a voltage detection point in the PN junction turn-on control loop of the PN junction switch type component, and detect the voltage value at the voltage detection point.

3. The component preheating system according to claim 2, characterized in that: The determination module is also used to calibrate the turn-on voltage threshold of the PN junction switch type component at various temperatures, and determine whether the voltage value at the voltage detection point of the PN junction switch type component reaches the turn-on voltage threshold of the PN junction switch type component at the corresponding temperature.

4. The component preheating system according to claim 3, characterized in that: The component preheating system also includes a fault detection module; The fault detection module is used to detect whether the PN junction switch type components of the PCB board are turned on after the PCB board is powered on; if not, a fault signal is sent to the determination module and the control module; The determination module is further configured to update the turn-on voltage threshold of the PN junction switch type component at various temperatures when receiving the fault signal sent by the fault detection module; The control module is further configured to send a second control signal to the preheating module when receiving a fault signal sent by the fault detection module; The preheating module is also used to heat the PCB board according to the second control signal sent by the control module.

5. The component preheating system according to claim 2, characterized in that: A heating area is provided on the PCB board; the PN junction switch type component is located on the heating area; The preheating module is also used to heat the PN junction switch type components on the heating area according to the control signal sent by the control module.

6. The component preheating system according to claim 5, characterized in that: The preheating module is a heating resistor.

7. A method for preheating components of a PCB board, characterized in that: The component preheating system for a PCB board as claimed in any one of claims 2 to 6, wherein the component preheating method comprises the following steps: Step S1. Obtain the turn-on voltage threshold K of the PN junction switch type component through a low temperature test 标准 Curves that vary with temperature; Step S2: The temperature acquisition module acquires the temperature of the PCB board and obtains the corresponding turn-on voltage threshold K of the PN junction switch type component at the temperature. 标准 ; Step S3: Estimate whether the voltage at the voltage detection point of the PN junction switch type component after the PCB board is powered on is greater than K 标准 ; If yes, it is determined that the PCB board does not need to be preheated and the process proceeds to step S5; if no, it is determined that the PCB board needs to be preheated and the process proceeds to step S4; Step S4. The control module sends a control signal to the preheating module, and the preheating module heats the PCB board until the estimated voltage value of the voltage detection point of the PN junction switch type component after the PCB board is powered on is greater than K 标准 ; Step S5: Power on the PCB.

8. The component preheating method according to claim 7, characterized in that: The step S1 comprises: selecting N PN junction type standard parts, performing low temperature verification tests on them respectively, obtaining curves of the turn-on voltages of the corresponding N PN junction switch type components changing with temperature, and taking the curve with the highest upper limit of the voltage value as the turn-on voltage threshold value K of the PN junction switch type component. 标准 Curves that vary with temperature.

9. The component preheating method according to claim 8, characterized in that: The component preheating method also includes the following: 标准 Update steps: Step S6. After the PCB board is powered on, detect whether the PN junction switch type components of the PCB board are turned on; if so, proceed to step S7; if not, proceed to step S9; Step S7. Record the voltage value of the voltage detection point of the PN junction switch type component into the history database, and then return to step S6 to continue recording the voltage value and calculating the average value of all the saved voltage values ​​until the calculated average value of all the saved voltage values ​​is greater than the turn-on voltage threshold K. 标准 Then, proceed to step S8; Step S8: Set the start voltage threshold K 标准 The value of is updated to the average value of all saved voltage values, and then returns to step S2; Step S9: Continue to heat the PCB until the PN junction switch type components on the PCB are turned on and the turn-on voltage threshold K 标准 The value of is updated to the voltage value of the voltage detection point of the PN junction switch type component at this time, and then returns to step S2.

10. The component preheating method according to claim 9, characterized in that: The step S5 also includes: after the PCB board is powered on, the corresponding PN junction switch type component opening voltage threshold K is obtained according to the temperature collected by the temperature collection module. 标准 , and determine whether the voltage value K of the voltage detection point of the PN junction switch type component actually detected by the voltage detection module is greater than K 标准 If so, then K 标准 The value is updated to the voltage value K, and the voltage value K is recorded in the historical database before entering step S6; if not, directly enter step S6.

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