Heater and verification device for circuit board in heater
By designing a circuit board verification device in a PTC heater, and using simulated load and power supply module to simulate the heating process of the heater, the problems of high verification cost and no high reliability in the prior art are solved, and a safer and more efficient verification process is achieved.
Patent Information
- Application Number
- CN202421177523.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The verification process of existing PTC heaters requires expensive high voltage power supplies and heat dissipation devices, resulting in high verification costs and no high reliability.
A verification device for the circuit board in a heater is designed, including an analog load, a power supply module and a processing module. Through the analog load, the heating plate of the heater is simulated, and the verification cost is reduced, and the power supply module is electrically connected to the function verification unit, the verification function is performed and the signal is transmitted to the processing module to determine the working status of the circuit board.
Improves the verification reliability of the circuit board, reduces verification costs, avoids the need to use expensive equipment, and the verification process is safer and more efficient.
Smart Images
Figure CN222812911U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heaters, in particular to a heater and a verification device for a circuit board in the heater. Background Art
[0002] Positive Temperature Coefficient Ceramic (PTC) heater is an automatic constant temperature and energy-saving electric heater, which is widely used in fish tank heating, high temperature heating furnace or semiconductor engineering.
[0003] In order to verify whether the relevant functions or parameters of the PTC heater are normal, an expensive high-voltage power supply is usually required to be electrically connected to the PTC heater to supply power to the PTC heater. When verifying the heating power and other parameters of the PTC heater, a chiller or other heat dissipation device is also required, which is costly. Utility Model Content
[0004] The utility model provides a heater and a verification device for a circuit board in the heater, so as to improve the verification reliability of the circuit board and reduce the verification cost.
[0005] In a first aspect, the utility model provides a verification device for a circuit board in a heater, wherein the circuit board includes at least two function verification units; the verification device includes: a simulated load, a power supply module and a processing module;
[0006] The power supply verification output terminal of the power supply module is electrically connected to the power supply verification input terminal of each of the function verification units; the verification signal output terminal of each of the function verification units is communicatively connected to the verification signal input terminal of the processing module;
[0007] The power supply input terminal of the simulated load is electrically connected to the power supply output terminal of the circuit board.
[0008] Optionally, the power supply module includes a power supply unit and a switch unit;
[0009] The power supply unit is electrically connected to the switch input terminal of the switch unit, the switch output terminal of the switch unit is electrically connected to each of the power supply verification input terminals, and the switch control terminal of the switch unit is electrically connected to the processing module.
[0010] Optionally, the switch unit includes at least two switch devices;
[0011] The switch input end of each of the switch devices is electrically connected to the power supply unit, the switch output end of the switch device corresponds one-to-one to and is electrically connected to the power supply verification input end, and the switch control end of each of the switch devices is electrically connected to the processing module.
[0012] Optionally, the power supply unit includes at least two power supplies, and the switch unit includes at least two switch devices;
[0013] The power supply corresponds to the switch device one-to-one and is electrically connected to the switch input terminal of the switch device. The switch device corresponds to the function verification unit one-to-one, and the switch output terminal of the switch device is electrically connected to the power supply verification input terminal.
[0014] Optionally, the processing module includes a power control signal output terminal;
[0015] The power control signal output terminal is electrically connected to the power control signal input terminal of the power supply module.
[0016] Optionally, the power supply verification output terminal of the power supply module is also electrically connected to the power supply providing terminal of the circuit board.
[0017] Optionally, at least two of the function verification units include a voltage verification unit, a current verification unit and a temperature verification unit.
[0018] Optionally, the power supply voltage range U of the power supply module satisfies 0V≤U≤5V.
[0019] Optionally, the simulated load includes a plurality of resistor groups;
[0020] Each of the resistor groups is connected in parallel, and the resistor group includes at least two resistors connected in series.
[0021] In a second aspect, the utility model further provides a heater, comprising an electrically connected circuit board and a positive temperature coefficient ceramic; the circuit board is verified and confirmed by using the verification device described in the first aspect.
[0022] The technical solution of the utility model reduces the verification cost by simulating the actual heating plate of the heater through a simulated load. The power supply input end of the simulated load is electrically connected to the power supply output end of the circuit board so that the circuit board provides a power supply signal to the simulated load. The power supply module is electrically connected to each function verification unit in the circuit board respectively, so that when the power supply module inputs a power supply verification signal to each function verification unit, each function verification unit performs a corresponding verification function, and communicates the verification signal to the processing module, so that the processing module determines the working state of the circuit board according to the verification signal, thereby improving the verification reliability of the circuit board and reducing the verification cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, although the drawings described below are some specific embodiments of the utility model, for those skilled in the art, the basic concepts of the device structure, driving method and manufacturing method disclosed and suggested by the various embodiments of the utility model can be expanded and extended to other structures and drawings. Undoubtedly, these should all be within the scope of the claims of the utility model.
[0024] Figure 1 A schematic diagram of the structure of a circuit board verification device in a heater provided by an embodiment of the utility model;
[0025] Figure 2 A schematic structural diagram of another circuit board verification device in a heater provided by an embodiment of the utility model;
[0026] Figure 3 A schematic structural diagram of another circuit board verification device in a heater provided by an embodiment of the utility model;
[0027] Figure 4 A schematic structural diagram of a circuit board verification device in a heater provided by another embodiment of the utility model;
[0028] Figure 5 A flow chart of a method for verifying a circuit board in a heater provided by an embodiment of the utility model;
[0029] Figure 6 A schematic diagram of the structure of a circuit board verification device in a heater provided by an embodiment of the utility model;
[0030] Figure 7 A schematic structural diagram of another circuit board verification device in a heater provided by an embodiment of the utility model;
[0031] Figure 8 A schematic structural diagram of another circuit board verification device in a heater provided by an embodiment of the utility model;
[0032] Fig. 9 A schematic structural diagram of a circuit board verification device in a heater provided by another embodiment of the utility model;
[0033] Fig.10 A schematic structural diagram of a heater provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will refer to the drawings in the embodiments of the utility model to clearly and completely describe the technical solution of the utility model through the implementation method. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the basic concepts disclosed and suggested by the embodiments of the utility model, all other embodiments obtained by those skilled in the art are within the scope of protection of the utility model.
[0035] Figure 1 A schematic diagram of the structure of a circuit board verification device in a heater provided by an embodiment of the utility model, such as Figure 1 As shown, the circuit board 10 includes at least two function verification units 11, and the verification device includes: a simulated load 20, a power supply module 30 and a processing module 40; the power supply verification output terminal out of the power supply module 30 is electrically connected to the power supply verification input terminal in of each function verification unit 11; the verification signal output terminal to of each function verification unit 11 is communicatively connected to the verification signal input terminal ti of the processing module 40; the power supply input terminal pi of the simulated load 20 is electrically connected to the power supply output terminal po of the circuit board 10.
[0036] Among them, the function verification unit 11 is used to verify whether the circuit board 10 can work normally when the simulated load 20 outputs power, so as to prevent the circuit board 10 used in the heater from having a fault and causing the heater to work abnormally. The subunit type in the function verification unit 11 can be set according to actual needs. For example, the function verification unit 11 includes a voltage sampling subunit, a current sampling subunit or a temperature sampling subunit, etc., and can also be other. Under the premise that the number of function verification units 11 is greater than or equal to two, the number of function verification units 11 can be set according to actual needs. For example, the circuit board 10 can only include two function verification units 11 with different verification functions related to the working state of the circuit board 10, or on the basis of including two function verification units 11 with different verification functions related to the working state of the circuit board 10, a function verification unit 11 with other verification functions can be set, which is not specifically limited here. The simulated load 20 can include a device such as a resistor that can achieve heat generation or output power, so that the simulated load 20 can simulate the heating state of the heating plate in the heater. The specific structure of the simulated load 20 can be set according to actual needs, which is not specifically limited here. The power supply module 30 can include power supply equipment such as a battery pack.
[0037] Specifically, the circuit board 10 provides a power supply signal to the simulated load 20 through the power supply output terminal po and the power supply input terminal pi, so that the simulated load 20 outputs power under the action of the power supply signal. In the process of the circuit board 10 providing the power supply signal to the simulated load 20, the power supply module 30 can input a power supply verification signal to each functional verification unit 11 through the power supply verification output terminal out and each power supply verification input terminal in. The power supply verification signal includes a voltage signal or a current signal, etc., which can be set according to actual needs. After the functional verification unit 11 receives the power supply verification signal, the test point of the functional verification unit 11 in the circuit board 10 is in a conductive state, so that the functional verification unit 11 can perform the corresponding verification function, and transmit the verification signal to the processing module 40 through the verification signal output terminal to and the verification signal input terminal ti. After the processing module 40 processes the verification signal according to the internal operation logic, it determines the working state of the circuit board 10. By setting at least two functional verification units 11 directly related to the working state of the circuit board 10, the working state of the circuit board 10 when the simulated load 20 outputs power can be determined through the functional verification unit 11, thereby improving the verification reliability of the circuit board 10 and reducing the verification cost.
[0038] The technical solution provided by the embodiment of the utility model reduces the verification cost by simulating the actual heating plate of the heater by simulating the load, the power supply input end of the simulated load is electrically connected to the power supply output end of the circuit board, so that the circuit board provides a power supply signal to the simulated load, and the power supply module is electrically connected to each function verification unit in the circuit board respectively, so that when the power supply module inputs a power supply verification signal to each function verification unit, each function verification unit performs a corresponding verification function, and communicates the verification signal to the processing module, so that the processing module determines the working state of the circuit board according to the verification signal, thereby improving the verification reliability of the circuit board and reducing the verification cost.
[0039] Optional, Figure 2 A schematic diagram of the structure of another circuit board verification device in a heater provided by an embodiment of the utility model, as shown in FIG. Figure 2 As shown, the power supply module 30 includes a power supply unit 31 and a switch unit 32; the power supply unit 31 is electrically connected to the switch input terminal si of the switch unit 32, the switch output terminal so of the switch unit 32 is electrically connected to each power supply verification input terminal in, and the switch control terminal sc of the switch unit 32 is electrically connected to the processing module 40.
[0040] Among them, the power supply unit 31 includes power supply equipment such as a battery pack, which can be set according to actual needs. The switch unit 32 includes a switch device, etc. Exemplarily, the switch unit 32 includes a relay, and can also be other devices, which are not specifically limited here.
[0041] Specifically, the power supply unit 31 inputs a power supply verification signal to the switch unit 32 through the switch input terminal si, and the processing module 40 provides a switch control signal to the switch unit 32 through the switch control terminal sc, and the switch control signal includes a turn-on signal for controlling the switch unit 32 to be turned on and a turn-off signal for controlling the switch unit 32 to be turned off. When the processing module 40 inputs a turn-on signal for controlling the switch unit 32 to be turned on to the switch unit 32, the switch unit 32 is in an on state, and the power supply verification signal provided by the power supply unit 31 can be transmitted to the function verification unit 11 through the switch unit 32, so that each function verification unit 11 performs the corresponding verification function at the same time, and transmits the verification signal to the processing module 40 to determine the verification result of the circuit board 10, thereby improving the verification efficiency of the circuit board 10.
[0042] Optional, Figure 3 A schematic diagram of the structure of another circuit board verification device in a heater provided by an embodiment of the utility model, as shown in FIG. Figure 3 As shown, the switch unit 32 includes at least two switch devices SW; the switch input end of each switch device SW is electrically connected to the power supply unit 31, the switch output end of the switch device SW corresponds to and is electrically connected to the power supply verification input end in one by one, and the switch control end of each switch device SW is electrically connected to the processing module 40.
[0043] The switch device SW includes a relay or a transistor, etc., which can be selected according to actual needs and is not specifically limited here.
[0044] Specifically, at least two switch devices SW are used, and the switch output terminals of each switch device SW correspond to and are electrically connected to the power supply verification input terminal in one by one, so that when only a certain function of the circuit board 10 needs to be verified whether it is normal, the processing module 40 can control the switch device SW corresponding to the required verification function through the switch control terminal to be in a conducting state, so as to realize the verification of a certain function of the circuit board 10 and improve the verification accuracy. The processing module 40 can also control the conduction of each switch device SW in a time-sharing manner according to actual needs, for example, after controlling the switch device SW1 to be turned on for 2s, the switch device SW2 is controlled to be turned on for 3s. The conduction time and conduction order of each switch device SW can be set according to actual needs, and are not specifically limited here.
[0045] Exemplarily, the function verification unit 11 includes a current sampling subunit 111 and a switch state sampling subunit 112. When an overcurrent fault occurs in the circuit board 10, it is necessary to detect whether the corresponding switch tube in the circuit board 10 that provides the power supply signal to the simulated load 20 can be disconnected in time, thereby preventing the overcurrent signal from being transmitted to the simulated load 20 through the corresponding switch tube and causing the simulated load 20 to work abnormally. The switch device SW1 and the switch device SW2 corresponding to the current sampling subunit 111 and the switch state sampling subunit 112 can be controlled to be turned on, so that the current sampling subunit 111 11 detects the current signal flowing through the circuit board 10, and the switch status sampling subunit 112 is used to collect the on or off signal of the switch tube. If an overcurrent fault occurs when the current sampling subunit 111 inputs the circuit board 10 to the processing module 40, and the switch status sampling subunit 112 inputs a signal that the switch tube is continuously turned on to the processing module 40, it means that the circuit board 10 cannot disconnect the electrical connection path with the simulated load 20 in time under the overcurrent condition. The circuit board 10 is working abnormally and cannot be used in an actual heater to prevent danger and improve the safety of the heater.
[0046] It can be understood that the above only provides an exemplary explanation of the verification process of the circuit board in combination with the current sampling subunit and the switch state sampling subunit. The function verification unit may also include a temperature sampling subunit. When the temperature sampling subunit detects that the temperature of the circuit board is abnormal, the switch state sampling subunit may detect the on and off states of the switch tube to verify the self-protection capability of the circuit board 10 under high temperature conditions. The verification process of the circuit board may also be other, which is not specifically limited here.
[0047] In an alternative embodiment, Figure 4 A schematic diagram of the structure of another circuit board verification device in a heater provided by an embodiment of the utility model is shown as follows: Figure 4 As shown, the processing module 40 also includes a power control signal output terminal co, which is electrically connected to the power control signal input terminal ci of the power supply unit 31, so that the processing module 40 provides a power control signal to the power supply module 30 through the power control signal output terminal co and the power control signal input terminal ci. The power control signal includes a signal for controlling the power supply module 30 to output a fixed value power supply verification signal, so that the power supply module 30 outputs a corresponding power supply verification signal according to the power control signal, so as to meet the verification requirements of the function verification unit 11 and improve the verification reliability. Among them, the power supply module 30 includes a voltage adjustment unit, etc., and the voltage adjustment unit can adjust the power supply verification signal output by the power supply module 30 according to the power control signal.
[0048] Figure 5A flowchart of a method for verifying a circuit board in a heater provided in an embodiment of the utility model. The verification method is suitable for verifying a circuit board in a heater provided in an embodiment of the utility model. The verification method can be used Figure 4 The verification device in is implemented. Figure 5 As shown, the verification method of the circuit board in the heater includes:
[0049] S11. Obtain at least two power supply verification signals.
[0050] Among them, each power supply verification signal corresponds to each function verification unit one by one.
[0051] Specifically, the power supply verification signals corresponding to the function verification units can be determined according to the setting parameters of the circuit board. When the circuit board is prepared, the power supply verification signals of the function verification units have been set and can be obtained from the setting parameters of the circuit board.
[0052] S12: Use the function verification unit to be verified currently as the function verification unit to be tested.
[0053] Specifically, since multiple power supply verification signals are provided before, in a testing phase, the same power supply verification signal can be applied only to the functional verification units with the same numerical power supply verification signals. Therefore, the functional verification unit currently to be verified is used as the functional verification unit to be tested, preventing errors in the verification process and improving verification accuracy.
[0054] It is understandable that the number of the function verification units to be tested can be one or more, and can be set according to actual needs, and is not specifically limited here.
[0055] S13, controlling the power supply unit to provide a power supply verification signal corresponding to the function verification unit to be tested.
[0056] Specifically, different power control signals can be provided to the power supply unit through the processing module, and the power supply unit can output a corresponding power supply verification signal according to the power control signal, so that the function verification unit to be tested can detect the relevant functional signals of the circuit board.
[0057] S14, controlling the switch device electrically connected to the function verification unit to be tested to be in an on state.
[0058] Specifically, the processing module can control the switch device electrically connected to the function verification unit to be in the on state, so that the power supply verification signal provided by the power supply unit can be transmitted to the function verification unit to be tested through the switch device, so that the function verification unit performs the verification function.
[0059] S15, obtaining a verification signal fed back by the function verification unit to be tested.
[0060] Specifically, after receiving the power supply verification signal, the function verification unit to be tested can detect the relevant function signals of the circuit board through the internal verification device, and convert the relevant function signals into verification signals, so as to subsequently determine the working status of the circuit board according to the verification signals, thereby improving the verification effect.
[0061] S16, taking the next function verification unit to be verified as the function verification unit to be tested, and returning to the step of controlling the power supply unit to provide a power supply verification signal corresponding to the function verification unit to be tested to obtaining the verification signal fed back by the function verification unit to be tested, until the verification signals fed back by each function verification unit are obtained.
[0062] Specifically, after the verification of one or a group of functional verification units is completed, the next functional verification unit to be verified is used as the functional verification unit to be tested, and the execution is returned to control the power supply unit to provide a power supply verification signal corresponding to the functional verification unit to be tested, control the switching device electrically connected to the functional verification unit to be tested to be in the on state, and obtain the verification signal fed back by the functional verification unit to be tested, until the verification signals fed back by each functional verification unit are obtained, so as to obtain all verification signals related to the circuit board, so as to determine the verification result of the circuit board according to the verification signal, thereby improving the verification efficiency of the circuit board.
[0063] The verification method of the circuit board in the heater provided by the embodiment of the utility model obtains at least two power supply verification signals, and takes the current function verification unit to be verified as the function verification unit to be tested, controls the power supply unit to provide the power supply verification signal corresponding to the function verification unit to be tested, and the switch device electrically connected to the function verification unit to be tested is in the on state, so as to obtain the verification signal fed back by the function verification unit to be tested; takes the next function verification unit to be verified as the function verification unit to be tested, and returns to execute the steps of controlling the power supply unit to provide the power supply verification signal corresponding to the function verification unit to be tested to obtaining the verification signal fed back by the function verification unit to be tested, until the verification signals fed back by each function verification unit are obtained, so as to obtain all verification signals related to the circuit board, so as to determine the verification result of the circuit board according to the verification signal, and improve the verification efficiency of the circuit board.
[0064] Optional, Figure 6 A schematic diagram of the structure of a circuit board verification device in a heater provided by an embodiment of the utility model, such as Figure 6 As shown, the power supply unit 31 includes at least two power supplies 311, and the switch unit 32 includes at least two switching devices SW; the power supplies 311 correspond one-to-one to the switching devices SW and are electrically connected to the switch input terminals of the switching devices SW, the switching devices SW correspond one-to-one to the function verification units 11, and the switch output terminals of the switching devices SW are electrically connected to the power supply verification input terminals in.
[0065] The power supply 311 includes power supply equipment such as a battery pack, which can be set according to actual needs and is not specifically limited here. The number of power supply units 311 can be set according to actual needs. For example, the power supply unit 31 includes n power supply units, namely, power supply unit 3111, power supply unit 3112, ..., power supply unit 311n, where n≥2.
[0066] Specifically, by setting the same number of power supplies 311 and switching devices SW as the function verification units 11, and making the power supplies 311 correspond one-to-one to the switching devices SW and electrically connected to the switch input terminal of the switching devices SW, the switching devices SW correspond one-to-one to the function verification units 11, and the switch output terminal of the switching device SW is electrically connected to the power supply verification input terminal in, so that when different function verification units 11 require different power supply verification signals, the power supply 311 corresponding to the function verification unit 11 can be controlled to provide the power supply verification signal required by the function verification unit 11, thereby improving the working reliability of the function verification unit 11 and improving the verification reliability of the circuit board 10.
[0067] Optional, Figure 7 A schematic diagram of the structure of another circuit board verification device in a heater provided by an embodiment of the utility model, as shown in FIG. Figure 7 As shown, the processing module 40 includes a power control signal output terminal co; the power control signal output terminal co is electrically connected to the power control signal input terminal ci of the power supply module 30.
[0068] Specifically, the processing module 40 can provide a power control signal to the power supply module 30 through the power control signal output terminal co and the power control signal input terminal ci according to the power supply verification signal required by the function verification unit 11. The power control signal includes a signal for controlling the power supply module 30 to output a fixed value power supply verification signal, so that the power supply module 30 outputs a corresponding power supply verification signal according to the power control signal to meet the verification requirements of the function verification unit 11 and improve the verification reliability. Among them, the power supply module 30 includes a voltage adjustment unit, etc., and the voltage adjustment unit can adjust the power supply verification signal output by the power supply module 30 according to the power control signal.
[0069] Optional, Figure 8 A schematic diagram of the structure of another circuit board verification device in a heater provided by an embodiment of the utility model, as shown in FIG. Figure 8 As shown, the power supply verification output terminal out of the power supply module 30 is also electrically connected to the power supply terminal pg of the circuit board 10.
[0070] Specifically, the power supply module 30 can provide a power supply verification signal to the circuit board 10 through the power supply verification output terminal out and the power supply providing terminal pg, so that the circuit board 10 is in a working state. The circuit board 10 can output the power supply verification signal provided by the power supply module 30 after stepping down or stepping up the voltage, so that the simulated load 20 outputs power to simulate the heating function of the heater and improve the verification reliability.
[0071] In an optional embodiment, at least two function verification units 11 include a voltage verification unit, a current verification unit, and a temperature verification unit. The voltage verification subunit is used to detect the current working voltage in the circuit board, and the current verification subunit is used to detect the current working current in the circuit board. If the current working voltage is greater than the overvoltage preset value, it indicates that the circuit board 10 is working abnormally. If the current working current is greater than the overcurrent preset value, it indicates that the circuit board 10 is working abnormally. When the circuit board 10 is applied to an actual heater, it may cause the heater to work abnormally, and in severe cases, it may cause leakage risks. Therefore, at least a voltage verification subunit and a current verification subunit are set in the circuit board 10 to improve the verification safety of the circuit board. The temperature verification unit may include multiple temperature verification subunits, each of which is used to detect the temperature at different devices to verify whether the device temperature is normal. For example, the switch temperature verification subunit is used to detect the working temperature of a switch tube such as a transistor, and the circuit board temperature verification subunit is used to detect the working temperature of the circuit board 10 to verify whether the temperature of the circuit board 10 is normal in the working state. The temperature verification subunit can also be other, which is not specifically limited here.
[0072] For example, if the power supply signal required by the simulated load is 3.3V, the theoretical voltage value after verification by the voltage verification subunit is 600V. At this time, the voltage signal output by the voltage verification subunit to the processing module 40 should meet 600V±1%, that is, between 594V and 606V. If the voltage signal actually output by the voltage verification subunit to the processing module 40 is not between 594V and 606V, it means that the voltage verification subunit of the circuit board 10 is abnormal and the circuit board 10 is unqualified. In addition, the overvoltage preset value of the circuit board 10 is 750V. If the voltage verification subunit detects that the current working voltage of the circuit board 10 is greater than 750V, it means that the circuit board 10 has an overvoltage fault. The undervoltage preset value is 450V. If the voltage verification subunit detects that the current working voltage of the circuit board 10 is less than 450V, it means that the circuit board 10 has an undervoltage fault. The overcurrent preset value is 30A. If the current verification subunit detects that the current working current of the circuit board 10 is greater than 30A, it means that the circuit board 10 has an overcurrent fault. At this time, the circuit board 10 needs to control the corresponding internal switch device to be in the disconnected state to prevent the circuit board 10 from continuously providing power supply signals to the simulated load 20 and burning the simulated load, thereby improving the safety of the use of the heater. If the preset temperature of the switch tube such as the transistor is 120°C, when the switch temperature verification subunit detects that the actual temperature of the switch end of the transistor is greater than the preset temperature, it means that the circuit board 10 is working abnormally and the circuit board 10 cannot be used in the actual heater to prevent danger and improve the safety of the use of the heater.
[0073] Optionally, the supply voltage range U of the power supply module 30 satisfies 0 V ≤ U ≤ 5 V. By using the power supply module 30 with a smaller supply voltage range, the verification cost of the circuit board 10 is reduced, while the verification security is improved.
[0074] Optional, Fig. 9 A schematic diagram of the structure of another circuit board verification device in a heater provided by an embodiment of the utility model is shown as follows: Fig. 9 As shown, the simulated load 20 includes a plurality of resistor groups 21; each resistor group 21 is connected in parallel, and the resistor group 21 includes at least two resistors R connected in series.
[0075] The resistance value of the resistor R can be set according to actual needs, which is not specifically limited here. On the basis that the resistor group 21 includes at least two resistors R in series, the number of resistors R can be set according to actual needs. For example, the resistor group 21 includes three resistors R in series, and the simulated load 20 includes two resistor groups 21 connected in parallel. It can also be other, which is not specifically limited here.
[0076] Specifically, the resistor R has a thermal effect, that is, when the current passes through the resistor R, the energy generated by the resistor R is converted into heat energy. The heat generated by the resistor R is Q = I 2Rt, I is the current flowing through the resistor R, t is the duration of the current flowing through the resistor R, the heat generated by the resistor R is proportional to the current flowing through the resistor R, the resistance value of the resistor R and the duration of the current flowing through the resistor R, and the simulated load 20 can be designed according to the power of the heating plate actually electrically connected to the circuit board 10. For example, the greater the power of the heating plate actually electrically connected to the circuit board 10, the greater the number of resistor groups 21 in the simulated load 20, provided that the number of series resistors R in the resistor group 21 is determined, so as to improve the simulation effect of the simulated load 20, improve the verification reliability of the circuit board 10, and reduce the verification cost.
[0077] Based on the same utility model concept, the utility model embodiment also provides a heater, Fig.10 A schematic diagram of the structure of a heater provided in an embodiment of the utility model is shown in FIG. Fig.10 As shown, the heater includes a circuit board 10 and a positive temperature coefficient ceramic 50 which are electrically connected.
[0078] Specifically, the positive temperature coefficient ceramic is a temperature-sensitive semiconductor resistor, which can be made of powdered materials such as rare earth barium carbonate by high-temperature sintering. The positive temperature coefficient ceramic has the characteristics of self-controlled constant temperature, corrosion resistance, energy saving and long service life. The circuit board electrically connected to the positive temperature coefficient ceramic is used to provide the positive temperature coefficient ceramic with the electric energy required for heating. The circuit board is verified and determined by the verification device provided in any embodiment of the utility model, and has the same beneficial effects as the verification device, which will not be repeated here.
[0079] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A verification device for a circuit board in a heater, wherein the circuit board comprises at least two function verification units; characterized in that: The verification device comprises: a simulated load, a power supply module and a processing module; The power supply verification output terminal of the power supply module is electrically connected to the power supply verification input terminal of each of the function verification units; the verification signal output terminal of each of the function verification units is communicatively connected to the verification signal input terminal of the processing module; The power supply input terminal of the simulated load is electrically connected to the power supply output terminal of the circuit board.
2. The verification device according to claim 1, characterized in that: The power supply module includes a power supply unit and a switch unit; The power supply unit is electrically connected to the switch input terminal of the switch unit, the switch output terminal of the switch unit is electrically connected to each of the power supply verification input terminals, and the switch control terminal of the switch unit is electrically connected to the processing module.
3. The verification device according to claim 2, characterized in that: The switch unit includes at least two switch devices; The switch input end of each of the switch devices is electrically connected to the power supply unit, the switch output end of the switch device corresponds one-to-one to and is electrically connected to the power supply verification input end, and the switch control end of each of the switch devices is electrically connected to the processing module.
4. The verification device according to claim 2, characterized in that: The power supply unit includes at least two power supplies, and the switch unit includes at least two switch devices; The power supply corresponds to the switch device one-to-one and is electrically connected to the switch input terminal of the switch device. The switch device corresponds to the function verification unit one-to-one, and the switch output terminal of the switch device is electrically connected to the power supply verification input terminal.
5. The verification device according to claim 1, characterized in that: The processing module includes a power control signal output terminal; The power control signal output terminal is electrically connected to the power control signal input terminal of the power supply module.
6. The verification device according to claim 1, characterized in that: The power supply verification output terminal of the power supply module is also electrically connected to the power supply providing terminal of the circuit board.
7. The verification device according to claim 1, characterized in that: At least two of the function verification units include a voltage verification unit, a current verification unit, and a temperature verification unit.
8. The verification device according to claim 1, characterized in that: The power supply voltage range U of the power supply module satisfies 0V≤U≤5V.
9. The verification device according to claim 1, characterized in that: The simulated load includes a plurality of resistor groups; Each of the resistor groups is connected in parallel, and the resistor group includes at least two resistors connected in series.
10. A heater, characterized in that: A circuit board and a positive temperature coefficient ceramic including electrical connections; The circuit board is verified and determined using the verification device described in any one of claims 1-9.