CN116298598B - Electronic Function Test Method for High Voltage PTC Electric Heaters - Google Patents
Electronic Function Test Method for High Voltage PTC Electric HeatersInfo
- Publication number
- CN116298598B CN116298598B CN202310015468.7A CN202310015468A CN116298598B CN 116298598 B CN116298598 B CN 116298598B CN 202310015468 A CN202310015468 A CN 202310015468A CN 116298598 B CN116298598 B CN 116298598B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses an electronic function test method of a high-voltage PTC electric heater, which comprises the following steps of 1, detecting peak current, 2, measuring steady-state current, then calculating standard power, 3, sequentially closing all partitions, recording corresponding current when current is stable after corresponding partitions are closed each time, then calculating to obtain steady-state current of each partition, 4, detecting non-current data of a normal direct-current voltage environment, 5, detecting working current of each partition under the ultra-high direct-current voltage, comparing the working current with the standard, 6, detecting non-current data 2 of the ultra-high direct-current voltage environment, simultaneously detecting discharge time S Discharge of electric power required by voltage reduction to 60V, 7, judging all test items after the test is finished. The invention can measure the standard power and the maximum heating capacity more stably and accurately, can ensure the partition current balance of the high-voltage PTC electric heater delivered from the factory, and ensures the stable quality of the product through the detection of the ultra-high direct-current voltage.
Description
Technical Field
The invention relates to the technical field of manufacturing of high-voltage PTC electric heaters, in particular to a method for testing electronic functions of a high-voltage PTC electric heater.
Background
A high voltage PTC electric heater in a thermal control system of an electric vehicle is an indispensable component.
In the prior art, a common method for testing the high-voltage PTC electric heater is to test the temperature of the air outlet under a specific air outlet volume, estimate the integral standard power of the high-voltage PTC electric heater, and not detect the steady-state current. Because steady state current is the only indicator of the measured nominal power, no accurate standard power is available. Meanwhile, the current of the high-voltage PTC electric heater subareas is not tested, and the heating capacity of each subarea cannot be guaranteed to be completely balanced. And no performance test at ultra-high dc voltage.
In practical application, the existing detection technology cannot determine the balance of the partition current, so that the temperature balance of each air outlet in the whole automobile cannot be ensured, and comfortable experience cannot be ensured.
Therefore, how to detect the current of each partition of the high-voltage PTC electric heater and the temperature relationship corresponding to each air outlet in the whole vehicle are technical problems to be solved by those skilled in the art.
Disclosure of Invention
The application provides an electronic function test method of a high-voltage PTC electric heater, which solves the problems that the standard power of the high-voltage PTC electric heater cannot be accurately measured and the air outlet temperature of each air outlet of a whole vehicle cannot be balanced by measuring the current of each subarea in the prior art.
The invention discloses a method for testing electronic functions of a high-voltage PTC electric heater, which comprises a core body and a circuit board controller, wherein the core body comprises N partitions which are controlled to be opened and closed by the circuit board controller, and the method comprises the following steps:
Step1, applying normal direct-current voltage to a piece to be tested, opening all the subareas, and recording the current as peak current I_peak after the current reaches the highest value and is stable;
Measuring a steady-state current I_stable (N), taking away heat generated by heating the core body after the current reaches the highest value and is stabilized by adopting a fan, and recording the heat as the steady-state current I_stable (N) after the current is stabilized;
Then calculating the value of the I_stable (N) normal direct voltage to obtain standard power;
Step 3, closing all the partitions in turn, and after closing the corresponding partitions each time, recording corresponding currents I_stable (N-1) to I_stable (1) when the currents are stable, and then calculating to obtain steady-state currents I_stable (partition 1) to I_stable (partition N) of each partition;
Step 4, detecting non-current data I_no current1 of a normal direct-current voltage environment, closing all the partitions, removing the blower, and observing whether the I_no current1 is in a range of 0 to 2.4 amperes;
Step 5, detecting working currents I_ON (partition 1) to I_ON (partition N) of each partition under the ultra-high direct voltage and ultra-high direct voltage, and comparing the working currents with a standard to determine that the test piece to be tested still has qualified performance under the ultra-high direct voltage;
Step 6, detecting no-current data I_no current2 of the ultra-high direct-current voltage environment, and simultaneously detecting discharge time S Discharge of electric power required by voltage reduction to 60V;
step 7, after the test is completed, judging all the test items, and if any one or more of the test items are unqualified, the total test result is unqualified;
And writing measured data and test piece information into the circuit board controller by LIN communication control for the test piece to be tested with qualified total test result.
The invention can detect the current of each partition of the high-voltage PTC electric heater, more stably and accurately measure the standard power, ensure the balance of the partition current of the high-voltage PTC electric heater delivered from the factory, and ensure the stable quality of the product through the detection of the ultra-high direct-current voltage.
Preferably, in step 3, if the partition 1 is not closed or the partition 1 is not present, the test result i_stable of the partition 1 is recorded as 0.
Preferably, in step 1 to step 3, if the fault code occurs in the circuit board controller, the test flow is ended, and the corresponding test piece to be tested is determined to be a defective product.
Preferably, in step 5, the operating current i_on (partition 1) to i_on (partition N) of each of the partitions can be directly read by the circuit board controller.
Preferably, in step 7, the test piece information includes a product serial number, a production date, and a detection date.
Preferably, in step 2, a plurality of thermocouples are arranged at the air inlet of the test piece to be tested to detect that the test piece to be tested reaches the instantaneous temperature average value of the steady-state current i_stable (N).
Preferably, the test piece to be tested provides a power supply with variable voltage through a programmable power supply.
Preferably, the fan is speed-regulated through frequency conversion and is arranged on the sliding guide rail.
Preferably, after step 7 is completed, the data and the test piece information in the circuit board controller are detected, and if the data and the test piece information are qualified, a sticking qualification is printed.
Preferably, in step 3, the calculation formulas of the steady-state currents i_stable (partition 1) to i_stable (partition N) of each of the partitions are as follows:
i_stable (partition N) =i_stable (N) -i_stable (N-1);
......
I_stable (partition 2) =i_stable (2) -i_stable (1);
i_stable (partition 1) =i_stable (1).
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 shows a test flow chart of an embodiment of the present invention.
Fig. 2 shows a schematic view of the placement of a blower and thermocouple in an embodiment of the invention.
FIG. 3 shows graphs of voltage and current obtained according to test time according to an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 and 3, the method for testing the electronic function of the high-voltage PTC electric heater comprises a core body and a circuit board controller, wherein the core body comprises N partitions which are controlled to be opened and closed by the circuit board controller, and the method comprises the following steps:
Step 1, applying normal direct-current voltage to a piece to be tested, opening all the subareas, and recording the current as peak current I_peak after the current reaches the highest value and is stable;
measuring a steady-state current I_stable (N), taking away heat generated by heating of a core body with the current reaching the highest value and stabilized by adopting a fan, and recording the heat as the steady-state current I_stable (N) after the current is stabilized;
Then calculating the value of the I_stable (N) normal direct voltage to obtain standard power;
Step 3, closing all the partitions in turn, and after closing the corresponding partitions each time, recording corresponding currents I_stable (N-1) to I_stable (1) when the currents are stable, and then calculating to obtain steady-state currents I_stable (partition 1) to I_stable (partition N) of each partition;
in the whole process from step 1 to step 3, checking whether the circuit board controller has a fault code, if so, directly ending the test, and judging that the product is unqualified.
Step 4, detecting non-current data I_no current1 of a normal direct-current voltage environment, closing all the partitions, removing the blower, and observing whether the I_no current1 is in a range of 0 to 2.4 amperes;
Step 5, detecting working currents I_ON (partition 1) to I_ON (partition N) of each partition under the ultra-high direct current voltage, and comparing the working currents with a standard to determine that the test piece to be tested still has qualified performance under the ultra-high direct current voltage;
Step 6, detecting no-current data I_no current2 of the ultra-high direct-current voltage environment, and simultaneously detecting discharge time S Discharge of electric power required by voltage reduction to 60V;
step 7, after the test is completed, judging all the test items, and if any one or more of the test items are unqualified, the total test result is unqualified;
And writing measured data and test piece information into the circuit board controller by LIN communication control for the test piece to be tested with qualified total test result.
According to the invention, through measuring the steady-state current I_stable (N), closing all the partitions one by one, recording the corresponding currents I_stable (N-1) to I_stable (1) when the corresponding partitions are closed each time, and then obtaining the steady-state currents I_stable (partition 1) to I_stable (partition N-1) of each partition through calculation, the current of each partition of the high-voltage PTC electric heater can be detected.
In practical applications, the normal dc voltage is typically in the range of 310V-390V, specifically, 330V, 350V or 370V, and the uhdc voltage is typically in the range of 410V-490V, specifically, 430V, 450V or 470V.
In addition, the steady-state current I_stable (N) is the only index for measuring whether the standard power of the high-voltage PTC electric warm air reaches the standard or not, is directly related to the material characteristic of the heating ceramic and the environmental temperature value T, and the environmental temperature value T participates in calculation in practical application to obtain the steady-state current.
In general, the ambient temperature T is an average value of temperatures at which the measured member reaches a steady state current moment by a plurality of thermocouples.
In practical application, the high-voltage PTC electric heater comprises a core body and a circuit board IGBT arranged between the core body and a circuit board controller.
In some embodiments, in step 3, if partition 1 is not closed or there is no partition 1, the test result i_stable of partition 1 is recorded as 0.
In practical application, the above technical means can enable the testing method to be suitable for high-voltage PTC electric heaters comprising a plurality of different number of partitions.
In some embodiments, in step 1 to step 3, if the circuit board controller has a fault code, the test flow is ended, and the corresponding test piece to be tested is determined to be a defective product.
In practical application, the fault code represents that the circuit board has faults, so that if the fault code occurs, the subsequent test is meaningless, and the test flow can be immediately ended.
In certain embodiments, in step 5, the operating current i_on (partition 1) to i_on (partition N) of each partition can be directly read by the circuit board controller.
In practical application, the circuit board controller can directly read I_ON (partition 1) to I_ON (partition N) to quickly and directly judge whether the performance of the high-voltage PTC electric heater is still qualified.
In certain embodiments, in step 7, the test piece information includes a product serial number, a production date, and a detection date.
In some embodiments, in step 2, a plurality of thermocouples are disposed at the air inlet of the test piece to be tested to detect that the test piece to be tested reaches the temperature average value of the steady-state current i_stable (N), i.e. the above-mentioned ambient temperature value T.
In practical applications, it is advantageous to calculate an accurate standard power using an instantaneous temperature average.
In some embodiments, the test piece to be tested is powered by a programmable power supply.
In practical applications, the programmable power supply needs to apply two different voltage environments, namely normal direct voltage and ultra-high direct voltage.
In some embodiments, as shown in FIG. 2, the fan is speed regulated by variable frequency and is disposed on a sliding rail.
In practical application, the sliding guide rail can provide different positions for the fan in different testing stages, and is convenient for movement between the different positions.
In some embodiments, after step 7 is completed, the data and the test piece information in the circuit board controller are detected, and if the data and the test piece information are qualified, a sticky qualification is printed.
In practical application, the data and information to be written into the circuit board controller are compared and confirmed, and the adhesive qualification certificate can be printed after the confirmation is correct.
In some embodiments, in step 3, the calculation formulas of the steady-state currents i_stable (partition 1) to i_stable (partition N) of each of the partitions are as follows:
i_stable (partition N) =i_stable (N) -i_stable (N-1);
......
I_stable (partition 2) =i_stable (2) -i_stable (1);
i_stable (partition 1) =i_stable (1).
In practical applications, the above calculation method is advantageous to exclude environmental influences so as to measure accurate zone steady-state current.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (6)
1. The electronic function test method of the high-voltage PTC electric heater, the high-voltage PTC electric heater includes core and circuit board controller; the core body comprises N partitions which are controlled to be opened and closed by the circuit board controller, and is characterized by comprising the following steps:
Step1, applying normal direct-current voltage to a piece to be tested, opening all the subareas, and recording the current as peak current I_peak after the current reaches the highest value and is stable;
If the circuit board controller has a fault code, ending the test flow and judging that the corresponding test piece to be tested is an unqualified product;
Measuring a steady-state current I_stable (N), taking away heat generated by heating the core body after the current reaches the highest value and is stabilized by adopting a fan, and recording the heat as the steady-state current I_stable (N) after the current is stabilized;
Then calculating the value of the I_stable (N) normal direct voltage to obtain standard power;
Setting a plurality of thermocouples at an air inlet of the test piece to be tested to detect that the test piece to be tested reaches a transient temperature average value of steady-state current I_stable (N);
If the circuit board controller has a fault code, ending the test flow and judging that the corresponding test piece to be tested is an unqualified product;
Step 3, closing all the partitions in turn, and after closing the corresponding partitions each time, recording corresponding currents I_stable (N-1) to I_stable (1) when the currents are stable, and then calculating to obtain steady-state currents I_stable (partition 1) to I_stable (partition N) of each partition;
if the partition of the 1 st is not closed or the partition of the 1 st is not closed, recording a test result I_stable (partition 1) of the partition of the 1 st as 0;
If the circuit board controller has a fault code, ending the test flow and judging that the corresponding test piece to be tested is an unqualified product;
Step 4, detecting non-current data I_no current1 of a normal direct-current voltage environment, closing all the partitions, removing the blower, and observing whether the I_no current1 is in a range of 0 to 2.4 amperes;
Step 5, detecting working currents I_ON (partition 1) to I_ON (partition N) of each partition under the ultra-high direct current voltage, and comparing the working currents I_ON (partition N) with a standard to determine that the test piece to be tested still has qualified performance under the ultra-high direct current voltage;
The working current I_ON (partition 1) to I_ON (partition N) of each partition can be directly read by the circuit board controller;
Step 6, detecting no-current data I_no current2 in the ultra-high DC voltage environment, and simultaneously detecting the discharge time required by the voltage reduction to 60V ;
Step 7, after the test is completed, judging all the test items, and if any one or more of the test items are unqualified, the total test result is unqualified;
And writing measured data and test piece information into the circuit board controller by LIN communication control for the test piece to be tested with qualified total test result.
2. The method for testing the electronic function of the high-voltage PTC electric heater according to claim 1, wherein in step 7, the test piece information comprises a product serial number, a production date and a detection date.
3. The method for testing the electronic function of the high-voltage PTC electric heater according to claim 1, wherein the test piece to be tested provides a voltage-variable power supply through a programmable power supply.
4. The method for testing the electronic function of the high-voltage PTC electric heater according to claim 1, wherein the fan is speed-regulated by frequency conversion and is arranged on the sliding guide rail.
5. The method for testing electronic functions of a high-voltage PTC electric heater according to claim 1, wherein after step 7 is completed, the data and the test piece information in the circuit board controller are detected, and a paste certificate is printed if the data and the test piece information are qualified.
6. The method of claim 1, wherein in step 3, the calculation formulas of the steady-state currents i_stable (partition 1) to i_stable (partition N) of each of the partitions are as follows:
i_stable (partition N) =i_stable (N) -i_stable (N-1);
......
i_stable (partition 2) =i_stable (2) -i_stable (1);
I_stable (partition 1) =i_stable (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310015468.7A CN116298598B (en) | 2023-01-05 | 2023-01-05 | Electronic Function Test Method for High Voltage PTC Electric Heaters |
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| CN202310015468.7A CN116298598B (en) | 2023-01-05 | 2023-01-05 | Electronic Function Test Method for High Voltage PTC Electric Heaters |
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| CN116298598B true CN116298598B (en) | 2026-03-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116068311A (en) * | 2023-01-05 | 2023-05-05 | 上海马勒热系统有限公司 | Aging test method for high-voltage PTC electric heating heater |
| CN119984730B (en) * | 2025-01-17 | 2025-10-31 | 重庆长安科技有限责任公司 | Methods and devices for predicting air outlet temperature in automotive air conditioning systems, automobiles, and storage media. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103493583A (en) * | 2011-08-04 | 2014-01-01 | 三菱重工汽车空调系统株式会社 | Heater control device, control method, and control program |
| CN210604863U (en) * | 2019-08-27 | 2020-05-22 | 孝感华工高理电子有限公司 | Alternating current voltage withstand test machine for PTC heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008249170A (en) * | 2007-03-29 | 2008-10-16 | Matsushita Electric Ind Co Ltd | Heating element storage box cooling device |
| CN113135119A (en) * | 2020-07-07 | 2021-07-20 | 长城汽车股份有限公司 | Heat management device, device and electric vehicle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103493583A (en) * | 2011-08-04 | 2014-01-01 | 三菱重工汽车空调系统株式会社 | Heater control device, control method, and control program |
| CN210604863U (en) * | 2019-08-27 | 2020-05-22 | 孝感华工高理电子有限公司 | Alternating current voltage withstand test machine for PTC heater |
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