CN109947171B - Portable alternating current constant current source powered by rechargeable battery - Google Patents
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Abstract
The invention discloses a portable alternating current constant current source powered by a chargeable battery, which comprises an alternating current constant current source and is characterized in that: the alternating current constant current source comprises a charging circuit, a booster circuit, a sampling circuit, an alternating current signal conditioning circuit, an output digital power amplifier circuit, a storage module, a display module, a key module and a microprocessor. The invention relates to the field of electrical equipment, in particular to a portable alternating current constant current source powered by a chargeable battery. The invention has the advantages of portability, volume equivalent to the specification of a handheld multimeter, and stable output current and current frequency by adopting a rechargeable battery to supply power, wherein the continuous maximum power output time is not less than 5 hours, the invention has a charging function, and the invention adopts a digital keyboard setting function to quickly and accurately set the output current and the test time.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a portable alternating current constant current source powered by a chargeable battery.
Background
At present, a large number of current transformers are used in an electric device, and when the electric device is put into operation, periodic maintenance is required to judge the effectiveness of the current transformers. The detection process has different field conditions, has remote places, is inconvenient to carry a constant current source for alternating current power supply, has power failure, maintenance and power failure places and has places with narrow space. In maintenance of these aspects, heavy mains-powered constant current sources are quite inconvenient, which is a disadvantage of the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a portable alternating current constant current source powered by a chargeable battery, which is used for carrying out clipping peak processing on electromagnetic emission and conduction peaks from the source, so that peak electromagnetic interference of a single frequency point is avoided.
The invention adopts the following technical scheme to realize the aim of the invention:
A portable alternating current constant current source powered by a chargeable battery comprises an alternating current constant current source and is characterized in that: the alternating current constant current source comprises a charging circuit, a booster circuit, a sampling circuit, an alternating current signal conditioning circuit, a digital power amplifier circuit, a storage module, a display module, a key module and a microprocessor.
As a further limitation to the technical scheme, the charging circuit is electrically connected with the charging interface and the charging indicator, the charging interface is a USB port, the charging indicator is a diode DS1 and a diode DS2, the charging circuit comprises a chip U3, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a capacitor C12 and a capacitor C13, the pin 1 and the pin 3 of the chip U3 are connected with the cathode of the USB port, the pin 2 of the chip U3 is connected with one end of the resistor R15, the other end of the resistor R15 is connected with the cathode of the USB port, the pin 4 of the chip U3 is respectively connected with one end of the resistor R11 and one end of the capacitor C12, the pin 5 of the chip U3 is respectively connected with one end of the capacitor C13 and one end of the power supply BT1, the other end of the capacitor C12 is respectively connected with the cathode of the USB port, the pin 6 of the chip U3 is connected with one end of the resistor R14, the other end of the resistor R14 is connected with the cathode of the chip DS2, the pin 4 is connected with the cathode of the resistor R3 and the anode of the resistor DS1 is connected with the other end of the diode DS 1.
As a further limitation to the present technical solution, the boost circuit includes a boost chip U4, an inductor L1, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C14, a capacitor C15, a diode D1, a diode D2, a resistor R16, a resistor R17, a resistor R18, and a mos transistor Q1, the output end of the power supply BT1 is electrically connected to the negative electrode of the diode D2, one end of the capacitor C9, one end of the capacitor C10, and one end of the inductor L1, the positive electrode of the diode D2, the other end of the capacitor C9, and the other end of the capacitor C10 are all grounded, the other end of the inductor L1 is electrically connected to the positive electrode of the diode D1, one end of the resistor R16, and the pin 4 of the boost chip U4, the other end of the resistor R16 is electrically connected to the drain electrode of the mos transistor Q1, one end of the negative electrode of the diode D1 is electrically connected to one end of the resistor D17, one end of the capacitor C14, one end of the capacitor C15, one end of the pin of the boost chip U4, and the other end of the resistor C4 are electrically connected to the other end of the boost chip C4, and the other end of the resistor C1 is electrically connected to the other end of the resistor Q4, and the other end of the boost chip is electrically connected to the pin 4, and the other end of the resistor is electrically connected to the boost chip C1, and the other end of the resistor is electrically connected to the pin 4.
As a further limitation to the present technical solution, the ac signal conditioning circuit includes an adjustable resistor R1, the resistor R2, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the reference chip U2 and the comparator U3, the negative electrode of the diode D1 is electrically connected to one end of the resistor R2, one end of the capacitor C1, one end of the capacitor C6 and one end of the comparator U1, the other end of the resistor C1 and one end of the capacitor C6 are all grounded, the other end of the resistor R2 is electrically connected to one end of the resistor R4, the cathode pin 3 of the reference chip U2, one end of the resistor C1, one end of the capacitor C4, one end of the capacitor C5, the other end of the resistor C4, one end of the reference chip C2, the other end of the resistor C3, the other end of the resistor C2, the other end of the resistor C3, the reference chip, the other end of the resistor C2, the other end of the resistor C3, and the other end of the resistor C3 are all grounded, and the other end of the resistor C2 are electrically connected to one end of the resistor, respectively.
As a further limitation to the technical scheme, the output digital power amplifier circuit includes a module M1, a capacitor C8, a resistor R9 and a resistor R10, a pin 1 of the module M1 is connected to a cathode of the diode D1, both the pin 1 and a pin 6 of the module M1 are grounded, a pin 7 of the module M1 is electrically connected to the pin 8 of the module M1 through the resistor R9, a pin 5 of the module M1 is electrically connected to one end of the capacitor C8 and one end of the resistor R10 respectively, the other end of the capacitor C8 is grounded, the other end of the resistor R10 is electrically connected to an input signal source channel dac_in, a pin 3 of the module M1 is electrically connected to ac_out_l, a pin 4 of the module M1 is electrically connected to one end of an output end of the measurement transformer T1, and the other end of the output end of the measurement transformer T1 is electrically connected to ac_out_h.
As a further limitation to the technical scheme, the sampling circuit includes the measurement transformer T1 and a resistor R3, the output end of the comparator U3 is electrically connected to one end of the measurement transformer T1 and one end of the resistor R3, and the other end of the measurement transformer T1 and the other end of the resistor R3 are both electrically connected to the signal channel i_sense.
As a further limitation of the technical solution, the microprocessor includes a chip U7, the memory module includes a chip U10, the key module includes a key and a key scan circuit, and the display module includes a display screen and a driving chip U11.
As a further limitation of the present disclosure, pins 81 to 88 of the chip U7 are electrically connected to pins 2 to 9 of the driving chip U11, pins 97, 98, 1,2 of the chip U7 are electrically connected to pins key.1 to key.4 of the key scan circuit, pins 3, 4, 5, 7, 8 of the chip U7 are electrically connected to pins key.a to key.e of the key scan circuit, pin 52 of the chip U7 is electrically connected to pin 6 of the chip U10, pin 53 of the chip U7 is electrically connected to pin 2 of the chip U10, pin 54 of the chip U7 is electrically connected to pin 5 of the chip U10, pin 65 of the chip U7 is electrically connected to pin 1 of the chip U10, and pin 66 of the chip U7 is electrically connected to pin 3 of the chip U10.
As a further limitation of the present disclosure, the pin 15 of the chip U7 is electrically connected to the signal channel i_sense, and the pin 29 of the chip U7 is electrically connected to the output signal source channel dac_in.
Compared with the prior art, the invention has the advantages and positive effects that: during charging, a 5V/2A adapter is used for providing charging voltage through a TYPE-C interface, the chip U3 performs charging control, and the red-green indication light emitting diode DS1 and the diode DS2 are used for indicating charging and charging completion states.
The 3.7V lithium battery is boosted by a boosting circuit consisting of a boosting chip U4, an inductor L1, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C14, a capacitor C15, a diode D1, a diode D2, a resistor R16, a resistor R17, a resistor R18 and a mos tube Q1, and outputs 5V voltage, namely VCC. The diode D2 functions as a power supply reverse connection protection circuit, and the capacitor C9 and the capacitor C10 avoid circuit coupling interference, and the capacitor C11, the capacitor C14 and the capacitor C15 filter.
The voltage of 5V is a voltage regulating circuit branch consisting of a reference chip U2, a resistor R4 and a resistor R7, and the reference voltage is VREF 3V. The 3V reference voltage is divided by a resistor R6 and a resistor R8, and then the 1/2 reference voltage of 1.5V is output by a comparator U3. In the voltage regulating circuit, the adjustable resistor R1 and the resistor R5 are voltage regulating resistors, and accurate 1.5V voltage can be obtained by adjusting the adjustable resistor R1. The capacitor C4, the capacitor C5 and the capacitor C7 play a role of filtering in the circuit.
The two output terminals are respectively connected with the tested electric device, the switch is turned on, various parameters are set and measured through the key circuit, the parameters are displayed on the display screen, the sine wave signals are generated through a digital-analog (DAC) port after the amplitude and the phase of the output sine wave are calculated by the chip U7, the positive sine wave signals are input into a module M1 IN the output digital power amplifier circuit from an output signal source channel DAC_IN, and currents of corresponding parameters are input into the tested electric device by the module M1.
The current input value of the tested electric device is subjected to a current transformer T1 and a sampling resistor R3 to obtain a voltage signal, the voltage signal is directly overlapped with 1/2 reference voltage to obtain a sine wave voltage signal with the amplitude smaller than or equal to 3V by taking the 1/2 reference voltage as a reference, the voltage signal is transmitted to an analog-digital (ADC) conversion interface of a chip U7 through a signal channel I-sense, and the chip U7 converts the analog signal into digital data to be displayed on a display screen.
The invention has the advantages of portability, volume equivalent to the specification of a handheld multimeter, and stable output current and current frequency by adopting a rechargeable battery to supply power, wherein the continuous maximum power output time is not less than 5 hours, the invention has a charging function, and the invention adopts a digital keyboard setting function to quickly and accurately set the output current and the test time.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a charging circuit diagram and a power supply circuit diagram of the present invention.
Fig. 3 is a boost circuit diagram, an ac signal conditioning circuit diagram, and a digital power amplifier circuit diagram of the present invention.
Fig. 4 is a key circuit diagram of the present invention.
Fig. 5 is a schematic diagram of a microprocessor chip U7 of the present invention.
Fig. 6 is a schematic diagram of a memory module chip U10 according to the present invention.
Fig. 7 is a schematic diagram of a driving chip U11 module according to the present invention.
Detailed Description
One embodiment of the present invention will be described in detail below with reference to the attached drawings, but it should be understood that the scope of the present invention is not limited by the embodiment.
As shown in fig. 1-7, the invention comprises a charging circuit, a boost circuit, a sampling circuit, an alternating current signal conditioning circuit, a digital power amplifier circuit, a storage module, a display module, a key module and a microprocessor.
The charging circuit is electrically connected with a charging interface and a charging indicator lamp, the charging interface is a USB port, the charging indicator lamp is a diode DS1 and a diode DS2, the charging circuit comprises a chip U3, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a capacitor C12 and a capacitor C13, a pin 1 and a pin 3 of the chip U3 are connected with a cathode of the USB port, a pin 2 of the chip U3 is connected with one end of the resistor R15, the other end of the resistor R15 is connected with a cathode of the USB port, a pin 4 of the chip U3 is respectively connected with one end of the resistor R11 and one end of the capacitor C12, a pin 5 of the chip U3 is respectively connected with one end of a power supply BT1, the other end of the capacitor C12 is respectively connected with a cathode of the USB port, a pin 6 of the chip U3 is connected with one end of the resistor R14, the other end of the resistor R14 is connected with a cathode of the diode DS2, a pin 4 of the chip U3 is connected with one end of the resistor DS 13 is connected with the cathode of the diode DS1, and the other end of the diode DS1 is connected with the cathode of the diode DS 1.
The booster circuit comprises a booster chip U4, an inductor L1, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C14, a capacitor C15, a diode D1, a diode D2, a resistor R16, a resistor R17, a resistor R18 and a mos transistor Q1, wherein the output end of the power supply BT1 is electrically connected with the cathode of the diode D2, one end of the capacitor C9, one end of the capacitor C10 and one end of the inductor L1, the anode of the diode D2, the other end of the capacitor C9 and the other end of the capacitor C10 are grounded, the other end of the inductor L1 is electrically connected with the anode of the diode D1, one end of the resistor R16 and the pin 4 of the booster chip U4, the other end of the resistor R16 is electrically connected with the drain electrode of the mos transistor Q1, the cathode of the diode D1 is electrically connected with one end of the booster chip 17, one end of the capacitor C9, one end of the capacitor C15, one end of the pin of the booster chip U1 and the pin U4 of the other end of the resistor R16 are grounded, the other end of the resistor R16 is electrically connected with the other end of the booster chip U4 and the resistor Q4, the other end of the resistor R4 is grounded, and the other end of the resistor R4 is connected with the resistor C4 is grounded, and the other end of the resistor C4 is connected with the resistor C4 and the other end of the resistor C4 is grounded.
The alternating current signal conditioning circuit comprises an adjustable resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a reference chip U2 and a comparator U3, wherein the negative electrode of the diode D1 is electrically connected with one end of the resistor R2, one end of the capacitor C1, one end of the capacitor C6 and one end of the comparator U1 are grounded, the other ends of the resistor C1 and the capacitor C6 are respectively and electrically connected with one end of the resistor R4, one end of the cathode pin 3 of the reference chip U2, one end of the adjustable resistor R1, one end of the resistor R6, one end of the capacitor C4 and one end of the capacitor C5 are respectively grounded, the other end of the resistor R4 is respectively and electrically connected with one end of the reference chip U7, one end of the resistor C2 and one end of the capacitor C3 are respectively grounded, the other end of the resistor C2 is connected with one end of the resistor C3, and the other end of the resistor C3 is connected with one end of the resistor C3, and the other end of the resistor C2 is grounded, and the other end of the resistor C3 is electrically connected with one end of the resistor C3.
The output digital power amplifier circuit comprises a module M1, a capacitor C8, a resistor R9 and a resistor R10, wherein a pin 1 of the module M1 is connected with the cathode of the diode D1, both the pin 1 and a pin 6 of the module M1 are grounded, a pin 7 of the module M1 is electrically connected with the pin 8 of the module M1 through the resistor R9, a pin 5 of the module M1 is electrically connected with one end of the capacitor C8 and one end of the resistor R10 respectively, the other end of the capacitor C8 is grounded, the other end of the resistor R10 is electrically connected with an input signal source channel DAC_IN, a pin 3 of the module M1 is electrically connected with an AC_OUT_L, a pin 4 of the module M1 is electrically connected with one end of an output end of a measurement transformer T1, and the other end of the output end of the measurement transformer T1 is electrically connected with the AC_OUT_H.
The sampling circuit comprises a measuring transformer T1 and a resistor R3, wherein the output end of the comparator U3 is electrically connected with one end of the measuring transformer T1 and one end of the resistor R3, and the other end of the measuring transformer T1 and the other end of the resistor R3 are electrically connected with a signal channel I_sense.
The microprocessor comprises a chip U7, the storage module comprises a chip U10, the key module comprises keys and a key scanning circuit, and the display module comprises a display screen and a driving chip U11.
Pins 81 to 88 of the chip U7 are electrically connected with pins 2 to 9 of the driving chip U11, pins 97, 98, 1 and 2 of the chip U7 are electrically connected with pins key.1 to key.4 of the key scanning circuit, pins 3, 4, 5, 7 and 8 of the chip U7 are electrically connected with pins key.a to key.e of the key driving circuit, pin 52 of the chip U7 is electrically connected with pin 6 of the chip U10, pin 53 of the chip U7 is electrically connected with pin 2 of the chip U10, pin 54 of the chip U7 is electrically connected with pin 5 of the chip U10, pin 65 of the chip U7 is electrically connected with pin 1 of the chip U10, and pin 66 of the chip U7 is electrically connected with pin 3 of the chip U10.
The pin 15 of the chip U7 is electrically connected to the signal channel I_sense, and the pin 29 of the chip U7 is electrically connected to the output signal source channel DAC_IN
The chip U3 adopts a charging chip 4518, the boosting chip U4 adopts a boosting chip SXL2028, the reference chip U2 adopts a high-precision voltage reference chip MAX6174, the comparator U3 adopts an LM339 comparator, the module M1 adopts a digital power amplification chip TDA7294, and the chip U10 adopts a Flsh storage chip.
The chip U7 adopts STM32 series singlechip, and the AC_OUT_L and the AC_OUT_H are respectively connected with an output terminal.
The working flow of the invention is as follows: during charging, a 5V/2A adapter is used for providing charging voltage through a TYPE-C interface, the chip U3 performs charging control, and the red-green indication light emitting diode DS1 and the diode DS2 are used for indicating charging and charging completion states.
The 3.7V lithium battery is boosted by a boosting circuit consisting of a boosting chip U4, an inductor L1, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C14, a capacitor C15, a diode D1, a diode D2, a resistor R16, a resistor R17, a resistor R18 and a mos tube Q1, and outputs 5V voltage, namely VCC. The diode D2 functions as a power supply reverse connection protection circuit, and the capacitor C9 and the capacitor C10 avoid circuit coupling interference, and the capacitor C11, the capacitor C14 and the capacitor C15 filter.
The voltage of 5V is a voltage regulating circuit branch consisting of a reference chip U2, a resistor R4 and a resistor R7, and the reference voltage is VREF 3V. The 3V reference voltage is divided by a resistor R6 and a resistor R8, and then the 1/2 reference voltage of 1.5V is output by a comparator U3. In the voltage regulating circuit, the adjustable resistor R1 and the resistor R5 are voltage regulating resistors, and accurate 1.5V voltage can be obtained by adjusting the adjustable resistor R1. The capacitor C4, the capacitor C5 and the capacitor C7 play a role of filtering in the circuit.
The two output terminals are respectively connected with the tested electric device, the switch is turned on, various parameters are set and measured through the key circuit, the parameters are displayed on the display screen, the sine wave signals are generated through a digital-analog (DAC) port after the amplitude and the phase of the output sine wave are calculated by the chip U7, the positive sine wave signals are input into a module M1 IN the output digital power amplifier circuit from an output signal source channel DAC_IN, and currents of corresponding parameters are input into the tested electric device by the module M1.
The current input value of the tested electric device is subjected to a current transformer T1 and a sampling resistor R3 to obtain a voltage signal, the voltage signal is directly overlapped with 1/2 reference voltage to obtain a sine wave voltage signal with the amplitude smaller than or equal to 3V by taking the 1/2 reference voltage as a reference, the voltage signal is transmitted to an analog-digital (ADC) conversion interface of a chip U7 through a signal channel I-sense, and the chip U7 converts the analog signal into digital data to be displayed on a display screen.
The above disclosure is only one specific embodiment of the present invention, but the present invention is not limited thereto, and any changes that can be considered by those skilled in the art should fall within the scope of the present invention.
Claims (6)
1. A portable alternating current constant current source powered by a chargeable battery comprises an alternating current constant current source and is characterized in that: the alternating current constant current source comprises a charging circuit, a boosting circuit, a sampling circuit, an alternating current signal conditioning circuit, a digital power amplifier circuit, a storage module, a display module, a key module and a microprocessor;
The charging circuit is electrically connected with a charging interface and a charging indicator lamp, the charging interface is a USB port, the charging indicator lamp is a diode DS1 and a diode DS2, the charging circuit comprises a chip U3, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a capacitor C12 and a capacitor C13, a pin 1 and a pin 3 of the chip U3 are connected with a cathode of the USB port, a pin 2 of the chip U3 is connected with one end of the resistor R15, the other end of the resistor R15 is connected with a cathode of the USB port, a pin 4 of the chip U3 is respectively connected with one end of the resistor R11 and one end of the capacitor C12, a pin 5 of the chip U3 is respectively connected with one end of the capacitor C13 and one end of the power supply BT1, the other end of the capacitor C12 and the other end of the capacitor C13 are respectively connected with a cathode of the USB port, a pin 6 of the chip U3 is connected with one end of the resistor R14, the other end of the resistor R14 is connected with a cathode of the diode DS2, a pin 7 of the chip U3 is connected with a cathode of the resistor DS 13 and one end of the diode DS1 is connected with the anode of the diode DS 1;
The boost circuit comprises a boost chip U4, an inductor L1, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C14, a capacitor C15, a diode D1, a diode D2, a resistor R16, a resistor R17, a resistor R18 and a mos transistor Q1, wherein the output end of the power supply BT1 is electrically connected with the cathode of the diode D2, one end of the capacitor C9, one end of the capacitor C10 and one end of the inductor L1, the anode of the diode D2, the other end of the capacitor C9 and the other end of the capacitor C10 are grounded, the other end of the inductor L1 is electrically connected with the anode of the diode D1, one end of the resistor R16 and the pin 4 of the boost chip U4, the other end of the resistor R16 is electrically connected with the drain electrode of the mos transistor Q1, the cathode of the diode D1 is electrically connected with one end of the boost chip with one end of the resistor R17, one end of the capacitor C10, one end of the pin of the capacitor C15, the other end of the pin U4 of the boost chip U1 and the other end of the resistor U4 is connected with the other end of the resistor R4, the other end of the resistor R16 is electrically connected with the other end of the resistor Q1, the resistor R4 is connected with the other end of the resistor C4 and the resistor Q1, and the other end of the resistor C4 is connected with the resistor C4;
The alternating current signal conditioning circuit comprises an adjustable resistor R1, a resistor R2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a reference chip U2 and a comparator U1, wherein the negative electrode of the diode D1 is electrically connected with one end of the resistor R2, one end of the capacitor C1, one end of the capacitor C6 and a pin 7 of the comparator U1, the other ends of the resistor C1 and the capacitor C6 are grounded, the other ends of the resistor R2 are respectively and electrically connected with one end of the resistor R4, one end of the cathode pin 3 of the reference chip U2, one end of the adjustable resistor R1, one end of the resistor R6, one end of the capacitor C4 and one end of the capacitor C5 are grounded, the other end of the resistor C4 is respectively and one end of the reference chip U2, one end of the resistor C7 is connected with one end of the resistor C7, one end of the other end of the resistor C2 is grounded, the other end of the resistor C2 is connected with one end of the resistor C7, and the other end of the resistor C2 is connected with one end of the other end of the resistor C5, and the other end of the resistor C2 is grounded, and the other end of the resistor C2 is connected with one end of the resistor C2 is grounded, and the other end of the other end is connected with the other end of the resistor C2 is grounded, and the end is connected with the end is 3.
2. The portable ac constant current source powered by a rechargeable battery according to claim 1, wherein: the digital power amplifier circuit comprises a module M1, a capacitor C8, a resistor R9 and a resistor R10, wherein a pin 1 of the module M1 is connected with the cathode of the diode D1, both the pin 1 and a pin 6 of the module M1 are grounded, a pin 7 of the module M1 is electrically connected with the pin 8 of the module M1 through the resistor R9, a pin 5 of the module M1 is electrically connected with one end of the capacitor C8 and one end of the resistor R10 respectively, the other end of the capacitor C8 is grounded, the other end of the resistor R10 is electrically connected with an input signal source channel DAC_IN, a pin 3 of the module M1 is electrically connected with an AC_OUT_L, a pin 4 of the module M1 is electrically connected with one end of an output end of a measurement transformer T1, and the other end of the output end of the measurement transformer T1 is electrically connected with the AC_OUT_H.
3. The portable ac constant current source powered by a rechargeable battery according to claim 2, wherein: the sampling circuit comprises a measuring transformer T1 and a resistor R3, wherein the output end of the comparator U1 is electrically connected with one end of the measuring transformer T1 and one end of the resistor R3, and the other end of the measuring transformer T1 and the other end of the resistor R3 are electrically connected with a signal channel I_sense.
4. A portable ac constant current source powered by a rechargeable battery as claimed in claim 3, wherein: the microprocessor comprises a chip U7, the storage module comprises a chip U10, the key module comprises keys and a key scanning circuit, and the display module comprises a display screen and a driving chip U11.
5. The portable ac constant current source powered by a rechargeable battery according to claim 4, wherein: pins 81 to 88 of the chip U7 are electrically connected to pins 2 to 9 of the driving chip U11, pins 97, 98, 1,2 of the chip U7 are electrically connected to pins key.1 to key.4 of the key scanning circuit, pins 3, 4, 5, 7, 8 of the chip U7 are electrically connected to pins key.a to key.e of the key scanning circuit, pin 52 of the chip U7 is electrically connected to pin 6 of the chip U10, pin 53 of the chip U7 is electrically connected to pin 2 of the chip U10, pin 54 of the chip U7 is electrically connected to pin 5 of the chip U10, pin 65 of the chip U7 is electrically connected to pin 1 of the chip U10, and pin 66 of the chip U7 is electrically connected to pin 3 of the chip U10.
6. The portable ac constant current source powered by a rechargeable battery according to claim 5, wherein: the pin 15 of the chip U7 is electrically connected to the signal channel i_sense, and the pin 29 of the chip U7 is electrically connected to the input signal source channel dac_in.
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| CN103812092B (en) * | 2014-02-25 | 2017-04-05 | 天津市畅悦电子科技有限公司 | A kind of protection circuit that loudspeaker are exported for high-power audio |
| CN104124750B (en) * | 2014-08-12 | 2016-05-11 | 昆明理工大学 | A kind of intelligent sinewave output uninterrupted power source and autocontrol method |
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