CN113030559A - Method for detecting residual current of detector - Google Patents
Method for detecting residual current of detector Download PDFInfo
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- CN113030559A CN113030559A CN202110554489.7A CN202110554489A CN113030559A CN 113030559 A CN113030559 A CN 113030559A CN 202110554489 A CN202110554489 A CN 202110554489A CN 113030559 A CN113030559 A CN 113030559A
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a method for detecting residual current of a detector, which overcomes the safety problem caused by low leakage detection accuracy rate due to large acquisition error in the prior art and comprises the following steps: s1, detecting the original alternating current waveform and the input voltage Vin by a detector; s2, the single chip microcomputer module carries out sampling for multiple times, and the output voltage Vo sampled by the single chip microcomputer module ADC is calculated; s3, inputting the sampled output voltage Vo into a preset residual current detection model to obtain a to-be-detected residual current Ic; and S4, comparing the residual current with a preset threshold value, and if the residual current is greater than the threshold value, performing electric leakage alarm prompting by the singlechip module. According to the invention, signal sampling is simply processed, the original alternating current waveform is detected, and the current value is obtained by substituting the voltage value into the detection model, so that the circuit is simple and easy to realize, the acquisition error caused by the difference performance of components is prevented, and the detection accuracy and the safety monitoring performance of a fire protection fire system are improved.
Description
Technical Field
The invention relates to the technical field of fire protection electric fire monitoring, in particular to a method for detecting residual current of a detector.
Background
In the prior art, a common processing method for detecting the residual current is to convert a residual current signal into a direct current voltage signal suitable for processing by a single chip microcomputer through a full-wave rectification circuit, a filtering circuit and an amplifying circuit, so that an acquisition error is easily caused by the difference of performance parameters of components.
Disclosure of Invention
The invention provides a method for detecting the residual current of a detector, aiming at overcoming the safety problem caused by low electric leakage detection accuracy rate due to large acquisition error in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting residual current of a detector is characterized by comprising the following steps:
s1, detecting the original alternating current waveform and the input voltage Vin by a detector;
s2, the single chip microcomputer module carries out sampling for multiple times, and the output voltage Vo sampled by the single chip microcomputer module ADC is calculated;
s3, inputting the sampled output voltage Vo into a preset residual current detection model to obtain a to-be-detected residual current Ic;
and S4, comparing the residual current with a preset threshold value, and if the residual current is greater than the threshold value, performing electric leakage alarm prompting by the singlechip module.
The invention obtains the current value by simply processing signal sampling and substituting the voltage value into the detection model to detect the original alternating current waveform, has simple and easily realized circuit, prevents acquisition errors caused by different performances of components, improves the accuracy rate of electric leakage alarm and has low cost.
Preferably, the calculating step in S2 is:
wherein Vo is the output voltage, Vin is the input voltage, R5 is the resistance of the resistor, and R4 is the resistance of the resistor.
Preferably, the residual current detection model in S3 is constructed by the following steps:
s31, taking the output voltage Vo sampled in n continuous periods, and removing the maximum value and the minimum value in the periods;
s32, averaging the remaining values in each period to obtain a plurality of average values V (i), wherein i is the sequencing value of the period, and i is more than 0 and less than n;
s33, obtaining a function by constructing a plurality of average values V (i) and corresponding current residual currents ic (i)
Substituting the obtained average value V (i) in each period and the corresponding current residual current ic (i) to obtain a detection coefficient k and a detection constant b;
s34, obtaining a specific residual current detection model by using the detection coefficient k and the detection constant b
And Ic is the residual current to be detected, and Vo is the current output voltage.
Preferably, the detector comprises:
the electric leakage sampling processing module is used for detecting an original alternating current waveform and calculating residual current;
the single chip microcomputer module is used for alarming and prompting in the process of electric leakage and collecting electric leakage parameters in real time;
the power supply module is used for reducing voltage and supplying power to the whole system;
the power module is respectively connected with the single chip microcomputer module and the electric leakage sampling processing module, and the single chip microcomputer module is also connected with the electric leakage sampling processing module.
The electric leakage sampling processing module processes the input voltage Vin, calculates the output voltage Vo after sampling through the single chip microcomputer ADC, and then obtains the residual current, and the single chip microcomputer module carries out electric leakage alarm prompt when the residual current exceeds a threshold value, and collects the electric leakage parameters of the equipment in real time, and improves the detection accuracy and the safety monitoring performance of the fire-fighting fire system.
Preferably, the leakage sampling processing module comprises a capacitor C, a resistor EM, a resistor R, a capacitor C, an operational amplifier U1, a capacitor C, a resistor R and a capacitor C, one end of the capacitor C is connected with one end of the resistor EM, the other end of the resistor EM is connected with one end of the resistor R and one end of the resistor R respectively, the other end of the capacitor C is connected with one end of the resistor EM, the other end of the resistor R is connected with the same-direction input end of the capacitor C and the operational amplifier U1 respectively, the reverse input end of the operational amplifier U1 is connected with one end of the resistor R and one end of the resistor R respectively, the positive power source end of the operational amplifier U1 is connected with one end of the power source and one end of the capacitor C respectively, the output end of the operational amplifier U1 is connected with the other end of, The other end of the capacitor C2, the other end of the resistor R4, the other end of the capacitor C3 and the negative power supply end of the operational amplifier U1A are all grounded.
Preferably, the one-chip microcomputer module includes a one-chip microcomputer U1, an infrared receiving terminal D8, a light emitting diode LD1, a light emitting diode LD2, a resistor R9, a resistor R8, a capacitor C9, a resistor R6, a capacitor C10, a resistor R12, an inductor L2, a capacitor C13, a capacitor C11, a resistor R14, and a resistor R18, a power supply VCC3.3V is connected to one end of the resistor R9, one end of the resistor R8, one end of the resistor R12, one end of the inductor L2, one end of the capacitor C10, a Vin end of the one-chip microcomputer U1, and a VCC end of the one-chip microcomputer U1, the other end of the resistor R9 is connected to a first pin of the infrared receiving terminal D9, a third pin of the infrared receiving terminal D9 is connected to one end of the resistor R9 and one end of the capacitor C9, the other end of the capacitor C9 is connected to a vddo terminal of the resistor R9, and the other end of the capacitor C9 are connected to one end of the resistor R9, and the other end of the capacitor C9, the RAD end of the single chip microcomputer U1 is connected with the negative electrode of the light emitting diode LD1, the positive electrode of the light emitting diode LD1 is connected with the other end of the resistor R14, the L-out end of the single chip microcomputer U1 is connected with the negative electrode of the light emitting diode LD2, the positive electrode of the light emitting diode LD2 is connected with the other end of the resistor R18, the CAD end of the single chip microcomputer U1 is a mA _ In end used for being connected with the electric leakage sampling processing module, and the other end of the capacitor C10, the other end of the resistor R6, the other end of the capacitor C13.
Preferably, the model of the singlechip U1 is MBJ-ZD-BUS, and the model of the infrared receiving head D8 is LF 0038.
Preferably, the power module includes a fuse F1, a transient suppression diode D5, a diode D1, a diode D2, a diode D3, a diode D6, a diode D7, a diode D8, an electrolytic capacitor C6, a capacitor C7, a resistor R444, a resistor R111, a buck chip IC2, a zener chip IC1, an inductor L1, a diode D1, a capacitor C333, an electrolytic capacitor C111, a resistor R222, a resistor R555, a zener chip IC1, an electrolytic capacitor C222, a resistor R333, and a capacitor C444, LBUS + is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the transient suppression diode D1, one end of the capacitor C1, the anode of the diode D1, and the cathode of the diode D1, LBUS-is connected to the other end of the transient suppression diode D1, the cathode of the diode D1, the anode of the diode D1, and the anode of the diode D1, and the capacitor C1, and the cathode of the diode D1 are connected to the, One end of a capacitor C7 is connected with an IN end of a buck chip IC2, an EN end of the buck chip IC2 is connected with one end of a resistor R444, a CS end of the buck chip IC2 is connected with one end of a resistor R111, a SW end of the buck chip IC2 is connected with one end of an inductor L1 and the cathode of a diode D4 respectively, the other end of the inductor L1 is connected with one end of a power supply 5V, one end of a capacitor C333, the anode of an electrolytic capacitor C111, one end of a resistor R222 and the second pin of a voltage stabilizing chip IC1 respectively, the other end of the resistor R222 is connected with one end of a resistor R555, the third pin of the voltage stabilizing chip IC1 is connected with one end of a power supply VCC3.3V, the anode of an electrolytic capacitor C222, one end of the resistor R333 and one end of a capacitor C444 respectively, the anode of a diode D6, the anode of a diode D7, the other end of the capacitor C8, the cathode of the electrolytic capacitor C6, the cathode of a capacitor C7, the other end of the resistor R333 and the other end of the capacitor C444 are both grounded.
Preferably, the model of the voltage reduction chip IC2 is XL4001, and the model of the voltage stabilization chip IC1 is HT 7133-1.
Therefore, the invention has the following beneficial effects: the invention obtains the current value by simply processing signal sampling and substituting the voltage value into the detection model to detect the original alternating current waveform, the circuit is simple and easy to realize, the acquisition error caused by the difference performance of components is prevented, the accuracy rate of electric leakage alarm is improved, the cost is low, the electric leakage sampling processing module processes the input voltage Vin, the output voltage Vo is calculated after the sampling of the single chip microcomputer ADC, further the residual current is obtained, the single chip microcomputer module carries out electric leakage alarm prompt when the residual current exceeds the threshold value, and the electric leakage parameter of the equipment is collected in real time, so that the detection accuracy rate and the safety monitoring performance of the fire protection system are improved.
Drawings
Fig. 1 is a flowchart of the present embodiment.
Fig. 2 is a block diagram of the detector of the present embodiment.
Fig. 3 is a schematic circuit diagram of the leakage sampling processing module according to this embodiment.
Fig. 4 is a schematic circuit diagram of the single-chip microcomputer module of the embodiment.
Fig. 5 is a schematic circuit diagram of the power supply module of the present embodiment.
In the figure: 1. electric leakage sampling module 2, singlechip module 3, power module.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
Example (b):
the embodiment provides a method for detecting residual current of a detector, as shown in fig. 1 and fig. 3, which includes the following steps:
s1, detecting the original alternating current waveform and the input voltage Vin by a detector;
s2, the single chip microcomputer module carries out sampling for multiple times, and the output voltage Vo sampled by the single chip microcomputer module ADC is calculated;
the calculation step in S2 is:
wherein Vo is the output voltage, Vin is the input voltage, R5 is the resistance of the resistor, and R4 is the resistance of the resistor.
S3, inputting the sampled output voltage Vo into a preset residual current detection model to obtain a to-be-detected residual current Ic;
the residual current detection model is constructed by the following steps:
s31, taking the output voltage Vo sampled in n continuous periods, and removing the maximum value and the minimum value in the periods;
s32, averaging the remaining values in each period to obtain a plurality of average values V (i), wherein i is the sequencing value of the period, and i is more than 0 and less than n;
s33, obtaining a function by constructing a plurality of average values V (i) and corresponding current residual currents ic (i)
Substituting the obtained average value V (i) in each period and the corresponding current residual current ic (i) to obtain a detection coefficient k and a detection constant b;
s34, obtaining a specific residual current detection model by using the detection coefficient k and the detection constant b
Where Ic is the residual current to be detected and Vo is the current output voltage, and the specific circuit is shown in fig. 3.
In this embodiment, k =0.4422, b = -13.729 obtained by performing a test on a plurality of measurement sampling values, and the residual current detection model:
and S4, comparing the residual current with a preset threshold value, and if the residual current is greater than the threshold value, performing electric leakage alarm prompting by the singlechip module.
As shown in fig. 2, the detector includes a leakage sampling processing module 1 for detecting an original ac waveform and calculating a residual current;
the singlechip module 2 is used for alarming and prompting in the process of electric leakage and acquiring electric leakage parameters in real time;
the power module 3 is used for reducing voltage and supplying power to the whole system;
the power module is respectively connected with the single chip microcomputer module and the electric leakage sampling processing module, and the single chip microcomputer module is also connected with the electric leakage sampling processing module.
As shown In fig. 3, the leakage sampling processing module includes a capacitor C4, a resistor EM1, a resistor EM2, a resistor R1, a resistor R2, a resistor R3, a capacitor C2, an operational amplifier U1A, a capacitor C3, a resistor R4, a resistor R5, a capacitor C1, and an ac input terminal P1, two ends of the ac input terminal P1 are respectively connected to two ends of the capacitor C4, one end of the capacitor C4 is connected to one end of the resistor EM1, the other end of the resistor EM1 is respectively connected to one end of the resistor R1 and one end of the resistor R3, the other end of the capacitor C4 is connected to one end of the resistor EM2, the other end of the resistor R1 is respectively connected to one end of the capacitor C2 and the unidirectional input end of the operational amplifier U1A, the inverted input end of the operational amplifier U1A is respectively connected to one end of the resistor R4 and one end of the resistor R5, the operational amplifier U1 5 is respectively connected to one end of the power supply 5, the other end of the resistor R5 and one end of the resistor R5, the other end of the resistor EM2, the other end of the resistor R3, the other end of the capacitor C2, the other end of the resistor R4, the other end of the capacitor C3 and the negative power supply end of the operational amplifier U1A are all grounded.
In the electric leakage sampling processing circuit, signals are amplified by an operational amplifier U1A and then are sampled by a single chip microcomputer U1 through mA _ In, the single chip microcomputer U1 controls the detection of the open and short circuit function through Kpin, the single chip microcomputer U1 samples the highest value through software, the highest value and the lowest value are removed through multiple sampling, and the average value In each period is taken as an input variable.
As shown in fig. 4, the single chip module includes a single chip microcomputer U1, an infrared receiving terminal D8, a light emitting diode LD1, a light emitting diode LD2, a resistor R9, a resistor R8, a capacitor C9, a resistor R6, a capacitor C10, a resistor R12, an inductor L2, a capacitor C13, a capacitor C11, and a resistor R14R 18, a power supply VCC3.3V is connected to one end of a resistor R9, one end of a resistor R8, one end of a resistor R12, one end of an inductor L2, one end of a capacitor C10, a Vin end of a single chip microcomputer U1, and a VCC end of the single chip microcomputer U1, the other end of the resistor R9 is connected to a first pin of the infrared receiving terminal D9, a third pin of the infrared receiving terminal D9 is connected to one end of the resistor R9 and one end of the capacitor C9, the other end of the capacitor C9 is connected to a second pin of the infrared receiving terminal D9, the RST terminal of the single chip microcomputer U9 and the other terminal of the capacitor C9 are connected to the resistor R9, the resistor a terminal of the resistor R9, the capacitor C36, the RAD end of the single chip microcomputer U1 is connected with the negative electrode of the light emitting diode LD1, the positive electrode of the light emitting diode LD1 is connected with the other end of the resistor R14, the L-out end of the single chip microcomputer U1 is connected with the negative electrode of the light emitting diode LD2, the positive electrode of the light emitting diode LD2 is connected with the other end of the resistor R18, the CAD end of the single chip microcomputer U1 is a mA _ In end used for being connected with the electric leakage sampling processing module, and the other end of the capacitor C10, the other end of the resistor R6, the other end of the capacitor C13.
The model of the singlechip U1 is MBJ-ZD-BUS, and the model of the infrared receiving head D8 is LF 0038.
The single chip microcomputer U1 adopts a high-performance ARM, a 32-bit microcontroller with a Cortex-M0 as an inner core, the highest working frequency is 48MHz, the light emitting diode LD1 is used as a system operation indicator, the light emitting diode LD2 gives an alarm when the equipment leaks electricity, leakage parameters of the equipment, such as input voltage, output voltage and residual current value, are acquired in real time, and the feedback is carried out through two buses.
As shown in fig. 5, the power module includes a fuse F1, a transient suppression diode D5, a diode D1, a diode D2, a diode D3, a diode D6, a diode D7, a diode D8, an electrolytic capacitor C6, a capacitor C7, a resistor R444, a resistor R111, a buck chip IC2, a zener chip IC1, an inductor L1, a diode D1, a capacitor C333, an electrolytic capacitor C111, a resistor R222, a resistor R555, a zener chip IC1, an electrolytic capacitor C222, a resistor R333, and a capacitor C444, LBUS + is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the transient suppression diode D1, one end of the capacitor C1, the anode of the diode D1, and the cathode of the diode D1, the cathode of the diode D1 is connected to the cathode of the diode D1, the anode of the diode D1 and the anode of the diode D1, and the anode of the capacitor C1 are connected to one end of the diode D1, and the cathode of, One end of a capacitor C7 is connected with an IN end of a buck chip IC2, an EN end of the buck chip IC2 is connected with one end of a resistor R444, a CS end of the buck chip IC2 is connected with one end of a resistor R111, a SW end of the buck chip IC2 is connected with one end of an inductor L1 and the cathode of a diode D4 respectively, the other end of the inductor L1 is connected with one end of a power supply 5V, one end of a capacitor C333, the anode of an electrolytic capacitor C111, one end of a resistor R222 and the second pin of a voltage stabilizing chip IC1 respectively, the other end of the resistor R222 is connected with one end of a resistor R555, the third pin of the voltage stabilizing chip IC1 is connected with one end of a power supply VCC3.3V, the anode of an electrolytic capacitor C222, one end of the resistor R333 and one end of a capacitor C444 respectively, the anode of a diode D6, the anode of a diode D7, the other end of the capacitor C8, the cathode of the electrolytic capacitor C6, the cathode of a capacitor C7, the other end of the resistor R333 and the other end of the capacitor C444 are both grounded.
The model of the voltage reduction chip IC2 is XL4001, and the model of the voltage stabilization chip IC1 is HT 7133-1.
The power module adopts a communication power supply mode of a low-voltage two-bus and supplies power to the whole system after voltage reduction, wherein a diode D2, a diode D3, a diode D7 and a diode D8 form a rectification part, signals are filtered by a fast diode D1, a capacitor C6 and a capacitor C7 and then supply power to a voltage reduction chip IC2, and the signals are supplied to the system after voltage reduction by a voltage reduction chip IC 2.
The above embodiments are described in detail for the purpose of further illustrating the present invention and should not be construed as limiting the scope of the present invention, and the skilled engineer can make insubstantial modifications and variations of the present invention based on the above disclosure.
Claims (9)
1. A method for detecting residual current of a detector is characterized by comprising the following steps:
s1, detecting the original alternating current waveform and the input voltage Vin by a detector;
s2, the single chip microcomputer module carries out sampling for multiple times, and the output voltage Vo sampled by the single chip microcomputer module ADC is calculated;
s3, inputting the sampled output voltage Vo into a preset residual current detection model to obtain a to-be-detected residual current Ic;
and S4, comparing the residual current with a preset threshold value, and if the residual current is greater than the threshold value, performing electric leakage alarm prompting by the singlechip module.
2. The method for detecting the residual current of the detector as claimed in claim 1, wherein the step of calculating in S2 is as follows:
wherein Vo is the output voltage, Vin is the input voltage, R5 is the resistance of the resistor, and R4 is the resistance of the resistor.
3. The method for detecting the residual current of the detector as claimed in claim 1, wherein the residual current detection model in S3 is constructed by the following steps:
s31, taking the output voltage Vo sampled in n continuous periods, and removing the maximum value and the minimum value in the periods;
s32, averaging the remaining values in each period to obtain a plurality of average values V (i), wherein i is the sequencing value of the period, and i is more than 0 and less than n;
s33, obtaining a function by constructing a plurality of average values V (i) and corresponding current residual currents ic (i)
Substituting the obtained average value V (i) in each period and the corresponding current residual current ic (i) to obtain a detection coefficient k and a detection constant b;
s34, obtaining a specific residual current detection model by using the detection coefficient k and the detection constant b
And Ic is the residual current to be detected, and Vo is the current output voltage.
4. The method for detecting the residual current of the detector as claimed in claim 1, wherein the detector comprises:
the electric leakage sampling processing module is used for detecting an original alternating current waveform and calculating residual current;
the single chip microcomputer module is used for alarming and prompting in the process of electric leakage and collecting electric leakage parameters in real time;
the power supply module is used for reducing voltage and supplying power to the whole system;
the power module is respectively connected with the single chip microcomputer module and the electric leakage sampling processing module, and the single chip microcomputer module is also connected with the electric leakage sampling processing module.
5. The method for detecting the residual current of the detector as claimed in claim 4, wherein the electric leakage sampling processing module comprises a capacitor C4, a resistor EM1, a resistor EM2, a resistor R1, a resistor R2, a resistor R3, a capacitor C2, an operational amplifier U1A, a capacitor C3, a resistor R4, a resistor R5 and a capacitor C1;
one end of a capacitor C is connected with one end of a resistor EM1, the other end of a resistor EM1 is connected with one end of a resistor R1 and one end of a resistor R3 respectively, and the other end of a capacitor C4 is connected with one end of a resistor EM 2;
the other end of the resistor R1 is respectively connected with one end of a capacitor C2 and the equidirectional input end of an operational amplifier U1A, the reverse input end of the operational amplifier U1A is respectively connected with one end of a resistor R4 and one end of a resistor R5, the positive power end of the operational amplifier U1A is respectively connected with one end of a power supply VCC3.3V and one end of a capacitor C3, and the output end of the operational amplifier U1A is respectively connected with the other end of the resistor R5 and one end of a resistor R2;
the other end of the resistor R2 is connected with one end of the capacitor C1 and the mA _ In end, and the other end of the resistor EM2, the other end of the resistor R3, the other end of the capacitor C2, the other end of the resistor R4, the other end of the capacitor C3 and the negative power end of the operational amplifier U1A are all grounded.
6. The method for detecting the residual current of the detector as claimed in claim 1 or 4, wherein the singlechip module comprises a singlechip U1, an infrared receiving head D8, a light emitting diode LD1, a light emitting diode LD2, a resistor R9, a resistor R8, a capacitor C9, a resistor R6, a capacitor C10, a resistor R12, an inductor L2, a capacitor C13, a capacitor C11, a resistor R14 and a resistor R18;
the power supply VCC3.3V is respectively connected with one end of a resistor R9, one end of a resistor R8, one end of a resistor R12, one end of an inductor L2, one end of a capacitor C10, a Vin end of a singlechip U1 and a VCC end of the singlechip U1;
the other end of the resistor R9 is connected with a first pin of the infrared receiving head D8;
a third pin of the infrared receiving head D8 is respectively connected with one end of a resistor R8 and one end of a capacitor C9, and the other end of the capacitor C9 is connected with a second pin of the infrared receiving head D8;
the RST end of the singlechip U1 is respectively connected with the other end of the resistor R12 and one end of the capacitor C11, and the VDDA end of the singlechip U1 is respectively connected with the other end of the inductor L2 and one end of the capacitor C13;
the BTO end of the singlechip U1 is connected with one end of a resistor R6;
the RAD end of the singlechip U1 is connected with the cathode of the light-emitting diode LD 1;
the anode of the light-emitting diode LD1 is connected with the other end of the resistor R14;
the L-out end of the singlechip U1 is connected with the cathode of a light-emitting diode LD2, and the anode of the light-emitting diode LD2 is connected with the other end of the resistor R18;
the CAD end of the singlechip U1 is a mA _ In end for connecting the electric leakage sampling processing module, and the other end of the capacitor C10, the other end of the resistor R6, the other end of the capacitor C13 and the other end of the capacitor C11 are all grounded.
7. The method for detecting the residual current of the detector as claimed in claim 6, wherein the model of the singlechip U1 is MBJ-ZD-BUS, and the model of the infrared receiving head D8 is LF 0038.
8. The method for detecting the residual current of the detector as claimed in claim 4, wherein the power module comprises a fuse F1, a transient suppression diode D5, a diode D1, a diode D2, a diode D3, a diode D6, a diode D7, a diode D8, an electrolytic capacitor C6, a capacitor C7, a resistor R444, a resistor R111, a buck chip IC2, a voltage regulation chip IC1, an inductor L1, a diode D4, a capacitor C333, an electrolytic capacitor C111, a resistor R222, a resistor R555, a voltage regulation chip IC1, an electrolytic capacitor C222, a resistor R333 and a capacitor C444;
LBUS + is connected with one end of a fuse F1, the other end of the fuse F1 is respectively connected with one end of a transient suppression diode D5, one end of a capacitor C5, the anode of the diode D2 and the cathode of a diode D6, and LBUS-is respectively connected with the other end of a transient suppression diode D5, the cathode of the diode D7 and one end of the capacitor C8;
the cathode of the diode D2 is respectively connected with the cathode of the diode D3 and the anode of the diode D1, and the cathode of the diode D1 is respectively connected with the anode of the electrolytic capacitor C6, one end of the capacitor C7 and the IN end of the voltage reduction chip IC 2;
the EN end of the voltage reduction chip IC2 is connected with one end of the resistor R444, the CS end of the voltage reduction chip IC2 is connected with one end of the resistor R111, and the SW end of the voltage reduction chip IC2 is respectively connected with one end of the inductor L1 and the negative electrode of the diode D4;
the other end of the inductor L1 is respectively connected with a power supply 5V, one end of a capacitor C333, the anode of an electrolytic capacitor C111, one end of a resistor R222 and a second pin of a voltage stabilizing chip IC1, and the other end of the resistor R222 is connected with one end of a resistor R555;
a third pin of the voltage stabilizing chip IC1 is respectively connected with a power supply VCC3.3V, the anode of the electrolytic capacitor C222, one end of a resistor R333 and one end of a capacitor C444;
the anode of the diode D6, the anode of the diode D7, the other end of the capacitor C8, the cathode of the electrolytic capacitor C6, the other end of the capacitor C7, the other end of the resistor R444, the anode of the diode D4, the other end of the capacitor C333, the cathode of the electrolytic capacitor C111, the other end of the resistor R555, the cathode of the electrolytic capacitor C222, the other end of the resistor R333 and the other end of the capacitor C444 are all grounded.
9. The method as claimed in claim 8, wherein the voltage-reducing chip IC2 is of type XL4001, and the voltage-stabilizing chip IC1 is of type HT 7133-1.
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Citations (12)
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