Interference Pulse Suppression Method for Infant Care Electronic Devices

Abstract

The present invention discloses a method for suppressing interference pulses in an electronic device for infant care, which can specify the acceptable change bits of the device according to user requirements. Since the rate of increase or decrease in the temperature of an infant incubator is much lower than the change speed of electromagnetic pulse interference, through an algorithm, the requirements of various devices for the number of digits of temperature display are taken into account, and at the same time, the rate of normal temperature change and the effect of suppressing interference pulses are also considered, so that they all reach the best state. On the premise of determining the lowest bit of the effective bits of the AD sampling value of the device, by adding or subtracting the value of the next bit from the change amount of the lowest bit of the effective bits under the noise interference signal, the purpose of detecting useful signals from the noise interference signal is achieved, thereby improving the sampling accuracy and suppressing noise.

Description

Technical Field

[0001] The present invention relates to the field of infant care, and in particular to a method for suppressing interference pulses for infant care electronic devices. Background Art

[0002] Infant incubators and infant radiant warmers are commonly used medical electronic devices in neonatal departments and obstetrics departments. Such devices all have heating and temperature control circuits. Due to the excessive number of current electronic devices, the electromagnetic interference between them is extremely serious. Infant incubators and infant radiant warmers often exhibit phenomena such as unstable temperature control and display values when working in this severe interference environment, and in severe cases, they may even fail to work.

[0003] In view of the above situation, in terms of structure and circuit design, such devices usually adopt anti-interference circuits and electromagnetic shielding structures to reduce the influence of electromagnetic interference. However, the anti-interference circuit design is complex and difficult to design properly. The electromagnetic shielding structure has a high cost, and due to factors such as the device structure materials, it is very difficult to achieve a good electromagnetic shielding effect.

[0004] In response to this phenomenon, the present invention proposes a method for suppressing interference pulses for infant care electronic devices to solve the problem of suppressing interference pulses in infant incubators and infant radiant warmers. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for suppressing interference pulses for infant care electronic devices.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The method for suppressing interference pulses for infant care electronic devices according to the present invention includes the following steps:

[0008] S1. Determine the display acceptable change bit d of the infant care electronic device;

[0009] S2. Record the previous output value and the current sampling value a;

[0010] S3. When , then the current output value ;

[0011] When , sequentially judge When it holds, the current output ; When , the current output ;

[0012] When , sequentially judge When it holds, the current output ; When then the current output ;

[0013] n is a natural number and .

[0014] Since the rate of increase or decrease in the temperature of the infant incubator is much lower than the rate of change of the electromagnetic pulse interference, the algorithm takes into account both the requirements of various devices for the number of digits of temperature display and the rate of normal temperature change and the effect of suppressing electromagnetic interference pulses, so that both reach the optimal state.

[0015] Further, the d is the lowest bit of the valid bits of the AD sampling value of the infant care electronic device, and step 3 is replaced by: When then the current output value ;

[0016] When then sequentially judge When it holds, the current output ; When then the current output ;

[0017] When then sequentially judge then the current output ; When then the current output ;

[0018] n is a natural number and .

[0019] Further, both the last output value and the current sampling value a do not count the decimal point.

[0020] The advantages of the present invention are that it can specify the acceptable change bits of the device according to user requirements. Since the rate of increase or decrease in the temperature of the infant incubator is much lower than the rate of change of the electromagnetic pulse interference, the algorithm takes into account both the requirements of various devices for the number of digits of temperature display and the rate of normal temperature change and the effect of suppressing interference pulses, so that both reach the optimal state. On the premise of determining the lowest bit of the valid bits of the AD sampling value of the device, the present invention adds or subtracts the value of the next bit from the change amount of the lowest bit of the valid bits under the noise interference signal, so as to achieve the purpose of detecting the useful signal from the noise interference signal, thereby improving the sampling accuracy and suppressing the noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a flowchart of the interference pulse suppression method for the infant care electronic device of the present invention.

[0022] Figure 2 It is a flowchart for suppressing interference pulses at the least significant bit of the AD sampling value of the electronic device for infant care according to the present invention. Specific embodiments

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] One of the manifestations of electromagnetic interference on electronic devices for infant care, such as infant incubators and infant radiant warmers, is inaccurate measured temperature indication values and jumping digits. That is, when an electromagnetic interference pulse arrives, the sensor signal will be superimposed with pulse interference. After sampling and output, the displayed number will have a jump. The magnitude of the jump value is related to the amplitude of the electromagnetic pulse, and the number of jumps is related to the duration of the interference pulse group. Generally, the width of the interference pulse is relatively narrow. Even if there are many pulses in a pulse group, the displayed number will not stay at the jump value for a long time. Therefore, it is manifested as frequent jumping of the displayed number.

[0025] Based on the above analysis, when an interference pulse arrives, if the jump amplitude of the signal can be suppressed by a program and then sent to the display device, the output value will not have a jump; or the jumping signal can be made into an acceptable slow-changing signal by a program. For this reason, the inventor constructed the following algorithm model, that is

[0026] If the current signal sampling value a is equal to the previous signal output value , then the current signal output is: the previous signal output value ;

[0027] If the current signal sampling value a is greater than the previous signal output value , regardless of how much greater, then let the current signal output be: the previous signal output value ;

[0028] If the current signal sampling value a is less than the previous signal output value , regardless of how much less, then let the current signal output be: the previous signal output value ;

[0029] That is to say, the change amount between the current sampling signal and the last output signal is converted into a fixed minimum change amount, which is superimposed on the last signal output as the signal output for this time. This algorithm model can well suppress electromagnetic pulse interference, but has a greater impact on signals with normal changes, resulting in an overly slow change rate of signals with normal changes. Therefore, in order to balance the rate of normal temperature change and the effect of suppressing electromagnetic interference pulses, the inventor has formed the interference pulse suppression method for baby care electronic devices described in the present invention, specifically including:

[0030] S1. Determine the display acceptable change bit d of the baby care electronic device;

[0031] S2. Record the last output value and the current sampling value a;

[0032] S3. When then the current output value ;

[0033] When it is judged in turn that when is established, the current output ; when then the current output ;

[0034] When it is judged in turn that when is established, the current output ; when then the current output ;

[0035] n is a natural number and .

[0036] As Figure 1 shown, if the current signal sampling value a is equal to the last output value , that is is established, then the current output value is equal to the last output value , that is .

[0037] When the current signal sampling value a is greater than the last signal output value , that is is established, first judge whether is established. If it is established, continue to judge whether is established. If it is not established, it can be determined that . At this time, , then the current output . And so on, determine the current output value . If is established and during the judgment During the process, if appears, then the current output .

[0038] When the current signal sampling value a is less than the previous signal output value , that is holds, then first judge whether holds. If it holds, continue to judge whether holds. If it does not hold, then it can be determined that . At this time, , then the current output . And so on, determine the current output value . If holds, and during the judgment of , if appears, then the current output .

[0039] Assume that the previous output value is is: 1 2 3 4 5 6; the indicated value is displayed as 12.3 °C. Pulse interference causes the current sampling value a to be 223456. If anti-interference measures are not taken, the indicated value will jump to 22.3 °C, and the jump amplitude reaches 10 °C, exceeding the acceptable jump range; if the anti-interference measures of the present invention are taken, the user can specify that the acceptable change bit d of the output is 3. Since the current sampling value a is greater than the previous signal output , further judge . After judgment, it can be known that and , then the current sampling value , and the indicated value is displayed as 12.4 °C; its jump range is acceptable.

[0040] If the next sampling value is which is 123469. At this time, the previous output value is which is 124456; since the current sampling value a is less than the previous signal sampling value , further judge . After judgment by the baby care electronic device, it can be known that , then the current sampling value . That is to say, after taking the interference suppression measures described in the present invention, the indicated value changes between 12.4 °C and 12.3 °C, and the jump interval is 0.1 °C, which can meet the requirements of the acceptable jump range.

[0041] Furthermore, for common AD conversion components, such as 24-bit AD conversion chips, their actual effective bits are only 16 bits. For the sampling to avoid weak signals being submerged by internal circuit noise and not being detected normally, to improve the sampling accuracy and suppress noise, the method described in the present invention can be deformed as follows:

[0042] Determine the lowest bit d of the valid bits of the AD sampling value of the device. If the current signal sampling value is a and the previous signal output value then:

[0043] When then the current output value ; when then sequentially determine whether holds until it is determined that then the current output ; when then the current output ; when then sequentially determine whether holds until it is determined that then the current output ; when then the current output . Wherein, n is a natural number and .

[0044] As Figure 2 shown, if the current signal sampling value a is equal to the previous output value , that is holds, then the current output value is equal to the previous output value , that is .

[0045] When the current signal sampling value a is greater than the previous signal output value , that is holds, then first determine whether holds. If it holds, continue to determine whether holds. If it holds, continue to determine whether holds. If it does not hold, then it can be determined that . At this time , then the current output . And so on, determine the current output value . If holds, and during the determination of , if appears, then the current output .

[0046] When the current signal sampling value a is less than the previous signal output value , that is holds, then first determine whether holds. If it holds, continue to determine whether holds. If it holds, continue to determine whether holds. If it does not hold, then it can be determined that , at this time, , then the current output . And so on, determine the current output value . If holds, and during the judgment of , if appears, then the current output .

[0047] Assume that when the temperature of the device is stable at 12.35 °C, the invalid bits of each sampling value will randomly jump, that is, the percentile of the indication value will randomly jump. After taking the above measures, if the previous output value , the current sampling value , at this time, the current signal sampling value a is greater than the previous signal output value . Then , , then n is equal to 2, so the current output , and the indication value is 12.35 °C;

[0048] If the current sampling value a = 123488 and the previous output value , at this time, the current signal sampling value a is less than the previous signal output value . Then , , then n is equal to 1. At this time, the current output value , and the indication value is 12.35 °C;

[0049] If the current temperature of the device is stable at 12.35 °C and it is desired to increase the temperature of the device and stabilize it at 12.40 °C, during the process of the constant temperature value rising from 12.35 °C to 12.40 °C, when it has not reached 12.40 °C, each sampling value a is almost greater than the previous sampling value , that is , and , that is, n = 2, then the output value . Add it up multiple times until it reaches 12.40 °C. After that or varies within the range.

[0050] For example, if the current sampling value a = 123656 and the previous output value , , that is, n = 2, then the current output . Add it up multiple times like this until it reaches Then within varies within the range, so that the indication value can be stabilized at 12.40 °C and basically unchanged.

[0051] In the present invention, the influence of the decimal point is not considered for all sampled values and output values.

Claims

1. A method for suppressing interference pulses in an electronic device for infant care, characterized in that , including the following steps: S1. Determine the display acceptable change bit d of the baby care electronic device; S2, record the last output value and the current sampled value a; S3, when then the current output value ; When occurs, it is sequentially determined that when it holds, the current output is ; when occurs, the current output is ; When occurs, sequentially determine If it holds, the current output is ; When occurs, then the current output is ; n is a natural number and .

2. The interference pulse suppression method for an electronic device for infant care according to claim 1, characterized in that: where d is the least significant bit of the AD sampling value of the baby care electronic device, step 3 is replaced by: when the current output value is ; When occurs, it is sequentially determined that is established, and the current output is ; when occurs, the current output is ; When it is time to sequentially determine at this time, the current output ; when it is time, then the current output ; n is a natural number and .

3. The interference pulse suppression method for an electronic device for infant care according to claim 1, characterized in that: The last output value and the current sampled value a do not count the decimal point.

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