CN109947171A - It is a kind of to use chargeable battery-powered Portable AC electric current constant-current source - Google Patents
It is a kind of to use chargeable battery-powered Portable AC electric current constant-current source Download PDFInfo
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Abstract
Chargeable battery-powered Portable AC electric current constant-current source is used the invention discloses a kind of, including alternating current constant-current source, it is characterized in that: the alternating current constant-current source includes charging circuit, booster circuit, sample circuit, AC signal conditioning circuit, output digital power amplifier circuit, memory module, display module, key module and microprocessor.The present invention relates to electrical equipments, in particular, being related to a kind of using chargeable battery-powered Portable AC electric current constant-current source.Advantages of the present invention is easy to carry, volume is equivalent to the specification of hand-held multimeter, it is powered using chargeable battery, its continuous maximum power output time is not less than 5 hours, have charge function, function is arranged using numeric keypad, quick and precisely setting output electric current and testing time, outputting current steadily, power frequency are stablized.
Description
Technical field
The present invention relates to electrical equipments, in particular, being related to a kind of using chargeable battery-powered Portable AC
Electric current constant-current source.
Background technique
Currently, periodic maintenance largely is needed after electric device puts into operation using current transformer in electric device,
The validity of Cutoff current mutual inductor.Field condition is different in detection process, there is remote place, not readily portable Alternating Current Power Supply
Constant-current source has power-off service short of electricity place, there is narrow space place.In maintenance in these areas, bulky power grid power supply
Constant-current source is very inconvenient, this is in place of the deficiencies in the prior art.
Summary of the invention
Chargeable battery-powered Portable AC electric current constant current is used the technical problem to be solved in the present invention is to provide a kind of
Source carries out the processing of slicing peak from source by Electromagnetic Launching and the spike of conduction, avoids the spike electromagnetic interference of single-frequency point.
The present invention adopts the following technical scheme that realization goal of the invention:
It is a kind of to use chargeable battery-powered Portable AC electric current constant-current source, including alternating current constant-current source, feature
Be: the alternating current constant-current source includes charging circuit, booster circuit, sample circuit, AC signal conditioning circuit, digital power amplifier
Circuit, memory module, display module, key module and microprocessor.
It is further limited as to the technical program, the charging circuit is electrically connected charging interface and charging instruction
Lamp, the charging interface are USB port, and the charging indicator light is diode DS1 and diode DS2, the charging circuit include
Chip U3, resistance R11, resistance R13, resistance R14, resistance R15, capacitor C12 and capacitor C13, the pin 1 of the chip U3 and draw
Foot 3 connects the cathode of the USB port, and the pin 2 of the chip U3 connects one end of resistance R15, the other end of the resistance R15
The cathode of the USB port is connected, the pin 4 of the chip U3 is separately connected one end of resistance R11 and one end of capacitor C12, institute
The pin 5 for stating chip U3 is separately connected one end and the one end power supply BT1 of capacitor C13, the other end of the capacitor C12 and institute
The other end for stating capacitor C13 is separately connected the cathode of the USB port, and the pin 6 of the chip U3 connects the one of the resistance R14
End, the other end of the resistance R14 connect the cathode of the diode DS2, and the pin 7 of the chip U3 connects the resistance
One end of R13, the other end of the resistance R13 connect the cathode of the diode DS1, the anode of the diode DS1 and institute
The anode for stating diode DS2 is separately connected the anode of the USB port, and the pin 8 of the chip U3 connects the one of the resistance R11
End, the other end of the resistance R11 connect the anode of the USB port.
It is further limited as to the technical program, the booster circuit includes boost chip U4, inductance L1, capacitor
C9, capacitor C10, capacitor C11, capacitor C14, capacitor C15, diode D1, diode D2, resistance R16, resistance R17, resistance R18
And mos pipe Q1, the power supply BT1 output end are electrically connected the cathode of the diode D2, one end of the capacitor C9, institute
State one end of capacitor C10 and one end of the inductance L1, the other end of positive, the described capacitor C9 of the diode D2 and described
The other end of capacitor C10 is grounded, and positive, the described resistance of diode D1 is electrically connected in the other end of the inductance L1
The pin 4 of one end of R16 and the boost chip U4, the other end of the resistance R16 are electrically connected the leakage of the mos pipe Q1
One end with the resistance 17, one end of the capacitor C14, the electricity is electrically connected in pole, the cathode of the diode D1
One end, the pin 1 of the boost chip U4 and the pin 5 of the boost chip U4 of appearance C15, the other end of the capacitor C11,
The other end of the other end of the capacitor C14 and the capacitor C15 are grounded, and the other end of the resistance R17 electrically connects respectively
The pin 6 of the resistance R18 and the boost chip U4 are connect, the pin 2 of the boost chip U4 is electrically connected the mos pipe Q1
Grid, the resistance R18 the other end ground connection, the mos pipe Q1 source electrode ground connection.
It is further limited as to the technical program, the AC signal conditioning circuit includes adjustable resistance R1, described
Resistance R2, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5,
Capacitor C6, capacitor C7, fiducial chip U2 and comparator U3, the cathode of the diode D1 are electrically connected the one of the resistance R2
The pin 7 at end, one end of the capacitor C1, one end of the capacitor C6 and the comparator U1, the capacitor C1 and the electricity
The other end for holding C6 is grounded, and one end of the resistance R4, the benchmark core is electrically connected in the other end of the resistance R2
The negative electrode pin 3 of piece U2, one end of the adjustable resistance R1, one end of the resistance R6, one end of the capacitor C4 and described
The other end of one end of capacitor C5, the other end of the capacitor C4 and the capacitor C5 are grounded, the other end of the resistance R4
One end of the resistance R7 and the pin 1 of the fiducial chip U2, the other end ground connection of the resistance R7, institute is electrically connected
The pin 2 for stating fiducial chip U2 is grounded, and one end of the resistance R8, the electricity is electrically connected in the other end of the resistance R6
Hinder one end, one end of the capacitor C7 and the normal phase input end of the comparator U3 of R5, the other end of the resistance R8 and institute
The other end for stating capacitor C7 is grounded, and the other end of the adjustable resistance R1 is electrically connected the other end of the resistance R5, described
Comparator U3 output end is electrically connected the one of the comparator U3 inverting input terminal, one end of the capacitor C2 and the capacitor C3
The other end of end, the other end of the capacitor C2 and the capacitor C3 are grounded.
It is further limited as to the technical program, the output digital power amplifier circuit includes module M1, capacitor C8, electricity
R9 and resistance R10 is hindered, the pin 1 of the module M1 connects the cathode of the diode D1, the pin 1 and pin of the module M1
6 are grounded, and the pin 7 of the module M1 is electrically connected the pin 8 of the module M1 by the resistance R9, the module M1's
One end of the capacitor C8 and one end of the resistance R10 is electrically connected in pin 5, and the other end of the capacitor C8 is grounded,
The other end of the resistance R10 is electrically connected input signal source channels DAC_IN, and the pin 3 of the module M1 is electrically connected AC_
The pin 4 of OUT_L, the module M1 are electrically connected output end one end of measurement mutual inductor T1, and the measurement mutual inductor T1's is defeated
The outlet other end is electrically connected AC_OUT_H.
It is further limited as to the technical program, the sample circuit includes the measurement mutual inductor T1 and resistance
R3, the comparator U3 output end are electrically connected one end of described measurement mutual inductor T1 measurement end one end and the resistance R3, institute
The other end for stating the measurement mutual inductor T1 measurement end other end and the resistance R3 is electrically connected signal path I_sense.
It is further limited as to the technical program, the microprocessor includes chip U7, and the memory module includes
Chip U10, the key module include key and key scanning circuit, and the display module includes display screen and driving chip
U11。
It is further limited as to the technical program, the pin 81 to 88 of the chip U7 is electrically connected the driving core
The pin 2 to 9 of piece U11, the pin 97,98,1,2 of the chip U7 are electrically connected the pin key.1 of the key scanning circuit
To key.4, the pin 3,4,5,7,8 of the chip U7 is electrically connected pin key.a to the key.e of the key driving circuit,
The pin 52 of the chip U7 is electrically connected the pin 6 of the chip U10, and the pin 53 of the chip U7 is electrically connected the core
The pin 2 of piece U10, the pin 54 of the chip U7 are electrically connected the pin 5 of the chip U10, the pin 65 of the chip U7
It is electrically connected the pin 1 of the chip U10, the pin 66 of the chip U7 is electrically connected the pin 3 of the chip U10.
It is further limited as to the technical program, the pin 15 of the chip U7 is electrically connected the signal path I_
Sense, the pin 29 of the chip U7 are electrically connected the output signal source channels DAC_IN.
Compared with prior art, passed through when the advantages and positive effects of the present invention are: charging using the adapter of 5V/2A
TYPE-C interface provides charging voltage, and chip U3 carries out charge control, using red green indication light diode DS1 and diode
DS2 instruction charging finishes state with charging.
3.7V lithium battery is via boost chip U4, inductance L1, capacitor C9, capacitor C10, capacitor C11, capacitor C14, capacitor
The booster circuit boosting of C15, diode D1, diode D2, resistance R16, resistance R17, resistance R18 and mos pipe Q1 composition, output
5V voltage, i.e. VCC.Wherein, diode D2 plays power source reverse connection protection circuit, and capacitor C9, capacitor C10 avoid circuit from coupling
Interference, capacitor C11, capacitor C14 and capacitor C15 filtering.
The regulating circuit branch that 5V voltage is made of fiducial chip U2, resistance R2, resistance R4 and resistance R7, reference voltage 3V
That is VREF.3V reference voltage is divided through resistance R6, resistance R8, using comparator U3, exports 1/2 reference voltage of 1.5V.It adjusts
In volt circuit, adjustable resistance R1 and resistance R5 are regulating resistor, by adjusting adjustable resistance R1, can obtain accurately 1.5V electricity
Pressure.Capacitor C4, capacitor C5, capacitor C7, filter action is played in circuit.
Two output terminals are separately connected tested electric device, are turned on the switch, are arranged by key circuit each when measuring
Parameter is planted, can be shown on display screen and pass through digital-to-analog after these parameters, chip U7 calculate the amplitude and phase that export sine wave
(DAC) port generates sine wave signal, and just profound wave signal is input to output digital power amplifier electricity from output signal source channels DAC_IN
In module M1 in road, the electric current of relevant parameter is input to tested electric device by module M1.
The current input value of tested electric device obtains voltage signal through current transformer T1, sampling resistor R3, with 1/2
Reference voltage is directly superimposed, and is obtained on the basis of 1/2 reference voltage, sine voltage signal of the amplitude less than or equal to 3V, voltage
Signal is transmitted to analog to digital (ADC) translation interface of chip U7 by signal path I-sense, chip U7 by analog-converted at
Number display is on a display screen.
Advantages of the present invention is easy to carry, and volume is equivalent to the specification of hand-held multimeter, is powered using chargeable battery, connects
The continuous maximum power output time is not less than 5 hours, has charge function, and function is arranged using numeric keypad, is quick and precisely arranged
Electric current and testing time, outputting current steadily are exported, power frequency is stablized.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is charging circuit diagram and power supply circuit of the invention.
Fig. 3 is booster circuit figure of the invention, AC signal conditioning circuit figure and digital power amplifier circuit diagram.
Fig. 4 is key circuit figure of the invention.
Fig. 5 is microprocessor chip U7 module principle figure of the invention.
Fig. 6 is memory module chip U10 module principle figure of the invention.
Fig. 7 is driving chip U11 module principle figure of the invention.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
As shown in Fig. 1-Fig. 7, the present invention include charging circuit, booster circuit, sample circuit, AC signal conditioning circuit,
Digital power amplifier circuit, memory module, display module, key module and microprocessor.
The charging circuit is electrically connected charging interface and charging indicator light, and the charging interface is USB port, the charging
Indicator light be diode DS1 and diode DS2, the charging circuit include chip U3, resistance R11, resistance R13, resistance R14,
Resistance R15, capacitor C12 and capacitor C13, the pin 1 and pin 3 of the chip U3 connect the cathode of the USB port, the chip
The pin 2 of U3 connects one end of resistance R15, and the other end of the resistance R15 connects the cathode of the USB port, the chip U3
Pin 4 be separately connected one end of resistance R11 and one end of capacitor C12, the pin 5 of the chip U3 is separately connected capacitor C13
One end and the one end power supply BT1, the other end of the other end of the capacitor C12 and the capacitor C13 are separately connected described
The cathode of USB port, the pin 6 of the chip U3 connect one end of the resistance R14, and the other end of the resistance R14 connects institute
The cathode of diode DS2 is stated, the pin 7 of the chip U3 connects one end of the resistance R13, the other end of the resistance R13
The cathode of the diode DS1 is connected, the anode of the diode DS1 and the anode of the diode DS2 are separately connected described
The anode of USB port, the pin 8 of the chip U3 connect one end of the resistance R11, and the other end of the resistance R11 connects institute
State the anode of USB port.
The booster circuit includes boost chip U4, inductance L1, capacitor C9, capacitor C10, capacitor C11, capacitor C14, capacitor
C15, diode D1, diode D2, resistance R16, resistance R17, resistance R18 and mos pipe Q1, the power supply BT1 output end
It is electrically connected the one of the cathode of the diode D2, one end of the capacitor C9, one end of the capacitor C10 and the inductance L1
End, the other end of positive, described capacitor C9 and the other end of the capacitor C10 of the diode D2 are grounded, the inductance
One end of positive, the described resistance R16 of diode D1 and the pin of the boost chip U4 is electrically connected in the other end of L1
4, the other end of the resistance R16 is electrically connected the drain electrode of the mos pipe Q1, and the cathode of the diode D1 is electrically connected
One end with the resistance 17, one end of the capacitor C14, one end of the capacitor C15, the boost chip U4 pin 1
With the pin 5 of the boost chip U4, the other end and the capacitor C15 of the other end of the capacitor C11, the capacitor C14
The other end be grounded, drawing for the resistance R18 and boost chip U4 is electrically connected in the other end of the resistance R17
Foot 6, the pin 2 of the boost chip U4 are electrically connected the grid of the mos pipe Q1, the other end ground connection of the resistance R18, institute
State the source electrode ground connection of mos pipe Q1.
The AC signal conditioning circuit includes adjustable resistance R1, the resistance R2, resistance R4, resistance R5, resistance R6, electricity
It hinders R7, resistance R8, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, fiducial chip U2 and compares
Device U3, the cathode of the diode D1 are electrically connected one end of the resistance R2, one end of the capacitor C1, the capacitor C6
The other end of the pin 7 of one end and the comparator U1, the capacitor C1 and the capacitor C6 are grounded, and the resistance R2's is another
One end be electrically connected one end of the resistance R4, the negative electrode pin 3 of the fiducial chip U2, the adjustable resistance R1 one
End, one end of the resistance R6, one end of the capacitor C4 and the capacitor C5 one end, the other end of the capacitor C4 and institute
The other end for stating capacitor C5 is grounded, the other end of the resistance R4 be electrically connected the resistance R7 one end and the base
The pin 1 of quasi core piece U2, the other end ground connection of the resistance R7, the pin 2 of the fiducial chip U2 are grounded, the resistance R6's
One end of the resistance R8, one end of the resistance R5, one end of the capacitor C7 and the ratio is electrically connected in the other end
Compared with the normal phase input end of device U3, the other end of the other end of the resistance R8 and the capacitor C7 are grounded, the adjustable resistance
The other end of R1 is electrically connected the other end of the resistance R5, and it is anti-that the comparator U3 output end is electrically connected the comparator U3
Phase input terminal, one end of the capacitor C2 and the capacitor C3 one end, the other end of the capacitor C2 and the capacitor C3's
The other end is grounded.
The output digital power amplifier circuit includes module M1, capacitor C8, resistance R9 and resistance R10, and the module M1's draws
Foot 1 connects the cathode of the diode D1, and the pin 1 and pin 6 of the module M1 is grounded, and the pin 7 of the module M1 is logical
The pin 8 that the resistance R9 is electrically connected the module M1 is crossed, the capacitor C8 is electrically connected in the pin 5 of the module M1
One end and the resistance R10 one end, the other end ground connection of the capacitor C8, the other end of the resistance R10 is electrically connected
The pin 3 of input signal source channels DAC_IN, the module M1 are electrically connected AC_OUT_L, and the pin 4 of the module M1 is electrically
The output end other end of output end one end of connection measurement mutual inductor T1, the measurement mutual inductor T1 is electrically connected AC_OUT_H.
The sample circuit includes the measurement mutual inductor T1 and resistance R3, and the comparator U3 output end is electrically connected institute
State one end of measurement mutual inductor T1 measurement end one end and the resistance R3, the measurement mutual inductor T1 measurement end other end and described
The other end of resistance R3 is electrically connected signal path I_sense.
The microprocessor includes chip U7, and the memory module includes chip U10, the key module include key and
Key scanning circuit, the display module include display screen and driving chip U11.
The pin 81 to 88 of the chip U7 is electrically connected the pin 2 to 9 of the driving chip U11, the chip U7's
Pin 97,98,1,2 be electrically connected pin key.1 to the key.4, the chip U7 of the key scanning circuit pin 3,4,
5, the pin 52 of 7,8 pin key.a to the key.e, the chip U7 for being electrically connected the key driving circuit is electrically connected institute
The pin 6 of chip U10 is stated, the pin 53 of the chip U7 is electrically connected the pin 2 of the chip U10, and the chip U7's draws
Foot 54 is electrically connected the pin 5 of the chip U10, and the pin 65 of the chip U7 is electrically connected the pin 1 of the chip U10,
The pin 66 of the chip U7 is electrically connected the pin 3 of the chip U10.
The pin 15 of the chip U7 is electrically connected the signal path I_sense, and the pin 29 of the chip U7 is electrically
Connect the output signal source channels DAC_IN
Chip U3 uses charging chip 4518, and boost chip U4 uses boost chip SXL2028, and fiducial chip U2 is using high
Precision voltage reference chip MAX6174, comparator U3 use LM339 comparator, and module M1 uses digital power amplifier chip
TDA7294, chip U10 use Flsh storage chip.
Chip U7 uses STM32 series monolithic, and the AC_OUT_L and AC_OUT_H are separately connected output terminal.
Workflow of the invention are as follows: charging voltage is provided by TYPE-C interface using the adapter of 5V/2A when charging,
Chip U3 carries out charge control, finishes shape with charging using red green indication light diode DS1 and diode DS2 instruction charging
State.
3.7V lithium battery is via boost chip U4, inductance L1, capacitor C9, capacitor C10, capacitor C11, capacitor C14, capacitor
The booster circuit boosting of C15, diode D1, diode D2, resistance R16, resistance R17, resistance R18 and mos pipe Q1 composition, output
5V voltage, i.e. VCC.Wherein, diode D2 plays power source reverse connection protection circuit, and capacitor C9, capacitor C10 avoid circuit from coupling
Interference, capacitor C11, capacitor C14 and capacitor C15 filtering.
The regulating circuit branch that 5V voltage is made of fiducial chip U2, resistance R2, resistance R4 and resistance R7, reference voltage 3V
That is VREF.3V reference voltage is divided through resistance R6, resistance R8, using comparator U3, exports 1/2 reference voltage of 1.5V.It adjusts
In volt circuit, adjustable resistance R1 and resistance R5 are regulating resistor, by adjusting adjustable resistance R1, can obtain accurately 1.5V electricity
Pressure.Capacitor C4, capacitor C5, capacitor C7, filter action is played in circuit.
Two output terminals are separately connected tested electric device, are turned on the switch, are arranged by key circuit each when measuring
Parameter is planted, can be shown on display screen and pass through digital-to-analog after these parameters, chip U7 calculate the amplitude and phase that export sine wave
(DAC) port generates sine wave signal, and just profound wave signal is input to output digital power amplifier electricity from output signal source channels DAC_IN
In module M1 in road, the electric current of relevant parameter is input to tested electric device by module M1.
The current input value of tested electric device obtains voltage signal through current transformer T1, sampling resistor R3, with 1/2
Reference voltage is directly superimposed, and is obtained on the basis of 1/2 reference voltage, sine voltage signal of the amplitude less than or equal to 3V, voltage
Signal is transmitted to analog to digital (ADC) translation interface of chip U7 by signal path I-sense, chip U7 by analog-converted at
Number display is on a display screen.
Disclosed above is only a specific embodiment of the invention, and still, the present invention is not limited to this, any ability
What the technical staff in domain can think variation should all fall into protection scope of the present invention.
Claims (9)
1. a kind of use chargeable battery-powered Portable AC electric current constant-current source, including alternating current constant-current source, it is characterized in that:
The alternating current constant-current source includes charging circuit, booster circuit, sample circuit, AC signal conditioning circuit, digital power amplifier electricity
Road, memory module, display module, key module and microprocessor.
2. according to claim 1 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
Charging circuit is electrically connected charging interface and charging indicator light, and the charging interface is USB port, and the charging indicator light is two poles
Pipe DS1 and diode DS2, the charging circuit include chip U3, resistance R11, resistance R13, resistance R14, resistance R15, capacitor
C12 and capacitor C13, the pin 1 and pin 3 of the chip U3 connect the cathode of the USB port, and the pin 2 of the chip U3 connects
One end of connecting resistance R15, the other end of the resistance R15 connect the cathode of the USB port, and the pin 4 of the chip U3 is distinguished
One end of resistance R11 and one end of capacitor C12 are connected, the pin 5 of the chip U3 is separately connected one end and the power supply of capacitor C13
The other end of the one end power supply BT1, the other end of the capacitor C12 and the capacitor C13 are separately connected the cathode of the USB port,
The pin 6 of the chip U3 connects one end of the resistance R14, and the other end of the resistance R14 connects the diode DS2's
Cathode, the pin 7 of the chip U3 connect one end of the resistance R13, and the other end of the resistance R13 connects the diode
The cathode of DS1, the anode of the diode DS1 and the anode of the diode DS2 are separately connected the anode of the USB port, institute
The pin 8 for stating chip U3 connects one end of the resistance R11, and the other end of the resistance R11 connects the anode of the USB port.
3. according to claim 1 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
Booster circuit includes boost chip U4, inductance L1, capacitor C9, capacitor C10, capacitor C11, capacitor C14, capacitor C15, diode
D1, diode D2, resistance R16, resistance R17, resistance R18 and mos pipe Q1, the power supply BT1 output end are electrically connected institute
State the cathode of diode D2, one end of the capacitor C9, one end of the capacitor C10 and the inductance L1 one end, described two
The other end of positive, described capacitor C9 and the other end of the capacitor C10 of pole pipe D2 is grounded, the other end of the inductance L1
One end of positive, the described resistance R16 of diode D1 and the pin 4 of the boost chip U4, the resistance is electrically connected
The other end of R16 is electrically connected the drain electrode of the mos pipe Q1, and the cathode of the diode D1 is electrically connected with the resistance
17 one end, one end of the capacitor C14, one end of the capacitor C15, the pin 1 of the boost chip U4 and the boosting
The other end of the pin 5 of chip U4, the other end of the capacitor C11, the other end of the capacitor C14 and the capacitor C15 is equal
The pin 6 of the resistance R18 and the boost chip U4, the liter is electrically connected in ground connection, the other end of the resistance R17
The pin 2 of pressure chip U4 is electrically connected the grid of the mos pipe Q1, the other end ground connection of the resistance R18, the mos pipe Q1
Source electrode ground connection.
4. according to claim 3 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
AC signal conditioning circuit include adjustable resistance R1, the resistance R2, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8,
Capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, fiducial chip U2 and comparator U3, described two
The cathode of pole pipe D1 is electrically connected one end of the resistance R2, one end of the capacitor C1, one end of the capacitor C6 and described
The other end of the pin 7 of comparator U1, the capacitor C1 and the capacitor C6 are grounded, and the other end of the resistance R2 is electric respectively
Property connects one end, the negative electrode pin 3 of the fiducial chip U2, one end of the adjustable resistance R1, the electricity of the resistance R4
Hinder one end, one end of the capacitor C4 and one end of the capacitor C5 of R6, the other end of the capacitor C4 and the capacitor C5
The other end be grounded, the other end of the resistance R4 be electrically connected the resistance R7 one end and the fiducial chip U2
Pin 1, the other end ground connection of the resistance R7, the pin 2 of the fiducial chip U2 is grounded, the other end point of the resistance R6
It is not electrically connected one end of the resistance R8, one end of the resistance R5, one end of the capacitor C7 and the comparator U3
The other end of normal phase input end, the other end of the resistance R8 and the capacitor C7 are grounded, and the adjustable resistance R1's is another
End is electrically connected the other end of the resistance R5, and the comparator U3 output end is electrically connected the comparator U3 anti-phase input
It holds, one end of one end of the capacitor C2 and the capacitor C3, the other end of the other end of the capacitor C2 and the capacitor C3
It is grounded.
5. according to claim 1 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
Exporting digital power amplifier circuit includes that module M1, capacitor C8, resistance R9 and resistance R10, the pin 1 of the module M1 connect described two
The cathode of pole pipe D1, the pin 1 and pin 6 of the module M1 are grounded, and the pin 7 of the module M1 passes through the resistance R9 electricity
Property connects the pin 8 of the module M1, the pin 5 of the module M1 be electrically connected the capacitor C8 one end and the electricity
One end of R10, the other end ground connection of the capacitor C8 are hindered, the other end of the resistance R10 is electrically connected input signal source channels
The pin 3 of DAC_IN, the module M1 are electrically connected AC_OUT_L, and the pin 4 of the module M1 is electrically connected measurement mutual inductor
The output end other end of output end one end of T1, the measurement mutual inductor T1 is electrically connected AC_OUT_H.
6. according to claim 3 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
Sample circuit includes the measurement mutual inductor T1 and resistance R3, and the comparator U3 output end is electrically connected the measurement mutual inductor
One end of T1 measurement end one end and the resistance R3, the measurement mutual inductor T1 measurement end other end and the resistance R3's is another
End is electrically connected signal path I_sense.
7. according to claim 1 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
Microprocessor includes chip U7, and the memory module includes chip U10, and the key module includes key and key scan electricity
Road, the display module include display screen and driving chip U11.
8. according to claim 7 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
The pin 81 to 88 of chip U7 is electrically connected the pin 2 to 9 of the driving chip U11, the pin 97,98,1,2 of the chip U7
The pin 3,4,5,7,8 for being electrically connected pin key.1 to the key.4, the chip U7 of the key scanning circuit is electrically connected
Pin key.a to the key.e of the key driving circuit, the pin 52 of the chip U7 are electrically connected drawing for the chip U10
Foot 6, the pin 53 of the chip U7 are electrically connected the pin 2 of the chip U10, and the pin 54 of the chip U7 is electrically connected institute
The pin 5 of chip U10 is stated, the pin 65 of the chip U7 is electrically connected the pin 1 of the chip U10, and the chip U7's draws
Foot 66 is electrically connected the pin 3 of the chip U10.
9. according to claim 7 use chargeable battery-powered Portable AC electric current constant-current source, it is characterized in that: described
The pin 15 of chip U7 is electrically connected the signal path I_sense, and the pin 29 of the chip U7 is electrically connected the output
Signal source channels DAC_IN.
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|---|---|---|---|---|
| CN112859999A (en) * | 2020-12-31 | 2021-05-28 | 思特尔智能检测***(苏州)有限公司 | Alternating current source circuit |
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