CN220207733U - Circuit for preventing voltage measurement error and air conditioner - Google Patents
Circuit for preventing voltage measurement error and air conditioner Download PDFInfo
- Publication number
- CN220207733U CN220207733U CN202321630433.6U CN202321630433U CN220207733U CN 220207733 U CN220207733 U CN 220207733U CN 202321630433 U CN202321630433 U CN 202321630433U CN 220207733 U CN220207733 U CN 220207733U
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- power supply
- circuit
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 84
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005693 optoelectronics Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The application provides a prevent voltage measurement error's circuit and air conditioner relates to voltage measurement technical field, and its technical scheme main points are: comprising the following steps: the voltage dividing module is connected with the power supply and comprises one or more voltage dividing resistors; the conversion module is connected with at least one voltage dividing resistor in the voltage dividing module in parallel, the conversion module at least comprises an electric energy metering chip and a first capacitor, the electric energy metering chip is at least provided with a power supply end, an electric signal input end, a frequency output end and a grounding end, the first capacitor is connected with at least one voltage dividing resistor in parallel, and the electric signal input end is connected between the first capacitor and the voltage dividing resistor; the photoelectric isolation module is at least provided with an anode, a cathode, an emitter and a collector, wherein the anode is connected with the frequency output end, the cathode is connected with the grounding end, the emitter is grounded, and the collector is used for outputting a frequency signal. The circuit for preventing voltage measurement error and the air conditioner have the advantages of high detection precision and good stability.
Description
Technical Field
The application relates to the technical field of voltage measurement, in particular to a circuit for preventing voltage measurement errors and an air conditioner.
Background
In various household appliances, a power supply is required to provide stable voltage to keep normal operation, and particularly for the household appliances needing fine control, such as a variable frequency air conditioner unit, voltage fluctuation can have a great influence on the operation of the household appliances, so that in some prior art, a voltage detection circuit is arranged to detect the power supply voltage.
In general, the power supply voltage of the household appliance is 220V, in the prior art, a transformer is generally used to access the voltage, and then the voltage after transformation is measured, so that whether the voltage is stable or not can be calculated, however, the output of the transformer changes along with the environmental temperature, the linearity is different, so that inaccurate detection is caused, namely, the problem of thermal drift can be generated along with the temperature rise in the working process of the transformer, the detection error can be caused by the processing error of the device of the transformer, and the problems of large volume and high cost also exist in the scheme of using the transformer.
In view of the above problems, improvements are needed.
Disclosure of Invention
The utility model aims at providing a prevent voltage measurement error's circuit and air conditioner, have the advantage that detection accuracy is high, stability is good.
In a first aspect, the present application provides a circuit for preventing voltage measurement error, configured to detect a power supply voltage of an air conditioner, where the technical scheme is as follows:
comprising the following steps:
the voltage dividing module is connected with a power supply and comprises one or more voltage dividing resistors;
the conversion module is connected with at least one voltage dividing resistor in the voltage dividing module in parallel, the conversion module at least comprises an electric energy metering chip and a first capacitor, the electric energy metering chip is at least provided with a power supply end, an electric signal input end, a frequency output end and a grounding end, the first capacitor is connected with at least one voltage dividing resistor in parallel, and the electric signal input end is connected between the first capacitor and the voltage dividing resistor;
the photoelectric isolation module is at least provided with an anode, a cathode, an emitter and a collector, wherein the anode is connected with the frequency output end, the cathode is connected with the grounding end, the emitter is grounded, and the collector is used for outputting frequency signals.
The voltage dividing module is connected to the power supply, the conversion module is connected to at least one voltage dividing resistor on the voltage dividing module in parallel, so that voltage input is obtained, the voltage is input to the electric signal input end of the electric energy metering chip, the electric energy metering chip outputs a corresponding frequency signal according to the input voltage signal, the frequency signal corresponds to the voltage signal one by one, the frequency signal is output from the collector electrode in the photoelectric isolation module through the photoelectric isolation module, and the corresponding voltage signal can be obtained through identifying the frequency signal, so that the power supply corresponding to the power supply is calculated.
Further, in the present application, the voltage dividing resistor at least includes a radio frequency resistor, and the conversion module is connected in parallel with the radio frequency resistor.
The radio frequency resistor has the advantages of small volume, large power capacity, good high-frequency characteristic and stable and reliable performance, and is suitable for being used as a power distributor in a high-frequency circuit.
Further, in the present application, the voltage dividing resistor includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor that are connected in series, where the resistance values of the first resistor, the second resistor, the third resistor, and the fourth resistor are 300 kiloohms, the fifth resistor is the radio frequency resistor, and the resistance value of the fifth resistor is 560 ohms.
Further, in the present application, a sixth resistor is connected between the anode and the frequency output end, and the resistance value of the sixth resistor is 680 ohms.
Further, in the application, a second capacitor is further included, one end of the second capacitor is connected with the collector, and the other end of the second capacitor is connected with the emitter.
Further, in the present application, a seventh resistor is disposed between the second capacitor and the collector, a resistance value of the seventh resistor is 101 ohms, and a signal output end is connected between the seventh resistor and the second capacitor and is used for outputting a frequency signal.
Further, in the application, an eighth resistor is further arranged between the seventh resistor and the collector, one end of the eighth resistor is connected between the seventh resistor and the collector, the other end of the eighth resistor is connected with a 5-volt power supply, and the resistance value of the eighth resistor is 4.7 kiloohms.
Further, in the present application, the power supply terminal is connected with a 3.3 volt power supply.
Further, in the application, the electric energy metering chip is further provided with an effective value output end, the effective value output end is connected with a ninth resistor, the resistance value of the ninth resistor is 1 kiloohm, and the other end of the ninth resistor is connected with a 3.3-volt power supply.
Further, in the present application, the power supply terminal is connected with a power supply circuit, the power supply circuit includes:
a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first diode, a second diode, an adjustable shunt regulator with three terminals, and a first triode;
the adjustable shunt regulator is provided with three wiring terminals, namely an anode, a cathode and a reference terminal;
one end of the tenth resistor is connected with the live wire, the other end of the tenth resistor is connected with the third capacitor, the other end of the third capacitor is connected with the first diode, the other end of the first diode is connected with the twelfth resistor, one end of the twelfth resistor is connected with the cathode of the adjustable shunt regulator, the anode of the adjustable shunt regulator is connected with a zero line, one end of the eleventh resistor is connected between the tenth resistor and the third resistor, the other end is connected between the third capacitor and the first diode, one end of the second diode is connected between the third capacitor, the twelfth resistor and the first diode, the other end is connected with a zero line, one end of the seventh capacitor is connected between the first diode and the twelfth resistor, the other end is connected with a zero line, one end of the fifth capacitor is connected between the first diode and the twelfth resistor, the other end is connected with a zero line, one end of the fourth capacitor is connected between the twelfth resistor and the adjustable shunt regulator, the other end is connected between the fourteenth resistor and the fourteenth resistor, the fifteenth resistor is connected between the fourteenth resistor and the fifteenth resistor, the fifteenth resistor is connected between the fourteenth resistor and the fifteenth resistor, the eighth capacitor is connected with the thirteenth resistor, the fifteenth resistor and the sixteenth resistor in parallel, the sixth capacitor is connected with the thirteenth resistor, the fifteenth resistor and the sixteenth resistor in parallel, an output end is connected to a common end of the eighth capacitor and the sixth capacitor, and the output end is connected to the power supply end of the electric energy metering chip and is used for supplying power to the electric energy metering chip.
In a second aspect, the present application further provides an air conditioner, where the air conditioner is provided with a circuit for preventing voltage measurement errors.
It can be seen from the above that the circuit and the air conditioner for preventing voltage measurement errors provided by the application are characterized in that the voltage division module is connected to the power supply, the conversion module is connected to at least one voltage division resistor on the voltage division module in parallel, so that voltage input is obtained, the voltage is input to the electric signal input end of the electric energy metering chip, the electric energy metering chip outputs a corresponding frequency signal according to the input voltage signal, the frequency signal corresponds to the voltage signal one by one, the frequency signal is output from the collector electrode in the photoelectric isolation module through the photoelectric isolation module, the corresponding voltage signal can be obtained through identifying the frequency signal, and therefore, the power supply corresponding to the power supply is calculated.
Drawings
Fig. 1 is a schematic diagram of a circuit for detecting a power supply voltage in the prior art.
Fig. 2 is a schematic circuit diagram of a voltage measurement error prevention circuit provided in the present application.
Fig. 3 is a schematic diagram of a power supply circuit for supplying power to the electric energy metering chip according to the present application.
In the figure: 100. a voltage dividing module; 200. a conversion module; 300. a photovoltaic isolation module; r1, a tenth resistor; r2 and an eleventh resistor; r3, twelfth resistor; r4, thirteenth resistance; r5, fourteenth resistor; r6, fifteenth resistor; r7, sixteenth resistance; r8, ninth resistor; r9, eighth resistor; r10, sixth resistance; r11, seventh resistance; r12 is a first resistor; r13, second resistance; r14, third resistor; r15 and a fourth resistor; r16, fifth resistance; c1, a third capacitor; c2, a fourth capacitor; c3, a fifth capacitor; c4, a sixth capacitor; c5, a second capacitor; c6, a first capacitor; e1, a seventh capacitor; e2, an eighth capacitor; d1, a first diode; d2, a second diode; q1, a first triode.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. The components of the present application, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
For some products which need to be controlled finely according to different voltages, such as variable frequency air conditioners, a power supply voltage detection circuit is usually arranged to detect the voltage, and the existing power supply voltage detection circuit is connected with a power supply through a transformer, particularly one winding coil of the transformer is connected with a zero line and a live line, then the voltage after transformation is detected, and the detection result is unstable due to the fact that the temperature of the transformer is continuously increased in the operation process.
In this regard, referring to fig. 2, the present application first proposes a circuit for preventing voltage measurement error, which is used for detecting a power supply voltage of an air conditioner, and the technical scheme specifically includes:
the voltage division module 100 is connected with a power supply, and the voltage division module 100 comprises one or more voltage division resistors;
the ACL end shown in fig. 2 is generally connected to the neutral line, and the ACN end is generally connected to the live line.
The conversion module 200 is connected in parallel with at least one voltage dividing resistor in the voltage dividing module 100, the conversion module 200 at least comprises an electric energy metering chip and a first capacitor C6, the electric energy metering chip is at least provided with a power supply end, an electric signal input end, a frequency output end and a grounding end, the first capacitor C6 is connected in parallel with the at least one voltage dividing resistor, and the electric signal input end is connected between the first capacitor C6 and the voltage dividing resistor;
as shown in fig. 2, the power supply end is a VDD pin, the electrical signal input end is a V2P pin, the frequency output end is a CF1 pin, and the ground end is a GND pin.
The optoelectronic isolation module 300 is provided with at least an anode, a cathode, an emitter and a collector, wherein the anode is connected with the frequency output end, the cathode is connected with the grounding end, the emitter is grounded, and the collector is used for outputting a frequency signal.
As shown in fig. 2, the anode is 1 pin, the cathode is 2 pins, the emitter is 3 pins, and the collector is 4 pins.
The power supply is the power supply of the air conditioner, and for general household products, the power supply voltage is 220V.
The voltage dividing module 100 is mainly used for dividing the power supply voltage to avoid direct detection of the power supply voltage, and because the power supply voltage is 220V generally, the generated voltage fluctuation is easy to damage electronic components, therefore, generally speaking, the voltage dividing module 100 includes a plurality of voltage dividing resistors, in some embodiments, the voltage dividing resistors include at least a radio frequency resistor, the conversion module 200 is connected in parallel with the radio frequency resistor, the voltage dividing resistors include a first resistor R12, a second resistor R13, a third resistor R14, a fourth resistor R15 and a fifth resistor R16 connected in series with each other, the resistance values of the first resistor R12, the second resistor R13, the third resistor R14 and the fourth resistor R15 are 300 kiloohms, the fifth resistor R16 is a radio frequency resistor, and the resistance value of the fifth resistor R16 is 560 ohms.
The radio frequency resistor has the advantages of small volume, large power capacity, good high-frequency characteristic and stable and reliable performance, and is suitable for being used as a power distributor in a high-frequency circuit.
Through detecting one of a plurality of bleeder resistors, the stability of detection can be guaranteed, and the damage to related components caused by fluctuation of power supply voltage is avoided.
The electric energy metering chip is a chip capable of outputting frequency according to input voltage, the voltage and the frequency have a one-to-one correspondence, and particularly, the type of the electric energy metering chip can be BL0937 or BL0937B, and the electric energy metering chip is a wide-range single-phase multifunctional electric energy metering chip.
The first capacitor C6 mainly plays a role in safety protection.
Because the voltage division module 100 needs to divide the voltage of the power supply, the power supply needs to be connected with the voltage division resistor in the voltage division module 100, the power supply voltage is 220V generally, and for human bodies, the safety problem exists. The whole circuit can be divided into a strong current part and a weak current part by the photoelectric isolation module 300, wherein the strong current part refers to a relevant part connected with a power supply, the weak current part refers to a part which is subjected to photoelectric isolation, and the safety can be improved by separating the strong current part from the weak current part.
The collector is used for outputting a frequency signal, the output frequency signal can be input into the main control MCU, and the pulse period of the frequency signal is calculated through the main control MCU, so that a corresponding voltage effective value is obtained.
Through being connected with voltage dividing module 100 on the power, connect conversion module 200 in parallel on at least one bleeder resistor on voltage dividing module 100 to obtain voltage input, the electric signal input of voltage input to electric energy measurement chip, electric energy measurement chip outputs a corresponding frequency signal according to the voltage signal of input, wherein, frequency signal and voltage signal one-to-one, frequency signal is through the collecting electrode output in the optoelectronic isolation module 300 of optoelectronic isolation module 300, can obtain corresponding voltage signal through discernment frequency signal, thereby calculate the power that the power corresponds, compared with prior art, the problem of thermal drift can not appear, high, stability is good beneficial effect has the detection precision.
In some embodiments, a sixth resistor R10 is connected between the anode and the frequency output terminal, and the resistance value of the sixth resistor R10 is 680 ohms.
The device further comprises a second capacitor C5, one end of the second capacitor C5 is connected with the collector electrode, and the other end of the second capacitor C5 is connected with the emitter electrode.
A seventh resistor R11 is arranged between the second capacitor C5 and the collector, the resistance value of the seventh resistor R11 is 101 ohms, and a signal output end is connected between the seventh resistor R11 and the second capacitor C5 and used for outputting a frequency signal.
An eighth resistor R9 is further arranged between the seventh resistor R11 and the collector, one end of the eighth resistor R9 is connected between the seventh resistor R11 and the collector, the other end of the eighth resistor R9 is connected with a 5-volt power supply, and the resistance value of the eighth resistor R9 is 4.7 kiloohms.
The power supply end is connected with a 3.3 volt power supply.
The 3.3V power supply connected with the power supply end is used for enabling the electric energy metering chip to work normally, and 220V voltage can be converted into 3.3V voltage through a special power supply circuit to supply power.
The electric energy metering chip is also provided with an effective value output end, the effective value output end is connected with a ninth resistor R8, the resistance value of the ninth resistor R8 is 1 kiloohm, and the other end of the ninth resistor R8 is connected with a 3.3 volt power supply.
The effective value output end is connected with a 3.3-volt power supply through a ninth resistor R8, and after the voltage signal is input into the effective value output end, the function of enabling the electric energy metering chip to correspondingly output a frequency signal according to the voltage value input by the electric signal input end is shown.
In addition, because the frequency signal that the collecting electrode output is input to master control MCU, calculate the pulse cycle of frequency signal through master control MCU, and then obtain corresponding voltage effective value, and master control MCU is the control chip of whole air conditioner internal unit, for safety and stability, it needs to work under the low current environment, and the electric energy metering chip needs to measure the power supply voltage of air conditioner, it needs to insert zero line and live wire, therefore work under the high current environment, the operating voltage of electric energy metering chip is 3.3 volts, however, because the operating environment of electric energy metering chip and master control MCU is different, can not utilize master control MCU's power supply to supply power for electric energy metering chip.
Therefore, in the scheme of the application, a power supply circuit is specially configured to supply power to the electric energy metering chip, and specifically, the power supply circuit includes, as shown in fig. 3, a tenth resistor R1, an eleventh resistor R2, a twelfth resistor R3, a thirteenth resistor R4, a fourteenth resistor R5, a fifteenth resistor R6, a sixteenth resistor R7, a third capacitor C1, a fourth capacitor C2, a fifth capacitor C3, a sixth capacitor C4, a seventh capacitor E1, an eighth capacitor E2, a first diode D1, a second diode D2, an adjustable shunt regulator with three terminals, and a first triode Q1.
The adjustable shunt regulator is provided with three wiring terminals, namely an anode, a cathode and a reference terminal.
Wherein one end of a tenth resistor R1 is connected with a live wire, the other end of the tenth resistor R1 is connected with a third capacitor C1, the other end of the third capacitor C1 is connected with a first diode D1, the other end of the first diode D1 is connected with a twelfth resistor R3, one end of the twelfth resistor R3 is connected with a cathode of an adjustable shunt regulator, an anode of the adjustable shunt regulator is connected with a zero line, one end of an eleventh resistor R2 is connected between the tenth resistor R1 and the third capacitor C1, the other end of the eleventh resistor R2 is connected between the third capacitor C1 and the first diode D1, one end of a second diode D2 is connected between the third capacitor C1, the twelfth resistor R3 and the first diode D1, the other end of the seventh capacitor E1 is connected with the zero line, one end of the seventh capacitor E1 is connected between the first diode D1 and the twelfth resistor R3, the other end of the fifth capacitor C3 is connected between the first diode D1 and the twelfth resistor R3, the other end is connected with a zero line, one end of a fourth capacitor is connected between a twelfth resistor R3 and the adjustable shunt regulator, the other end is connected with a fourteenth resistor R5, the other end of the fourteenth resistor R5 is connected with a reference end of the adjustable shunt regulator, a collector of a first triode Q1 is connected between the twelfth resistor R3 and a first diode D1, a base is connected between the twelfth resistor R3 and the adjustable shunt regulator, an emitter is connected with the zero line, a thirteenth resistor R4, a fifteenth resistor R6 and a sixteenth resistor R7 are sequentially connected between the emitter and the zero line, wherein a wire is connected between the fifteenth resistor R6 and the sixteenth resistor R7 and between the fourteenth resistor and the adjustable shunt regulator, an eighth capacitor E2 is connected with the thirteenth resistor R4, the fifteenth resistor R6 and the sixteenth resistor R7 in parallel, a sixth capacitor C4 is connected with the thirteenth resistor R4, the fifteenth resistor R6 and the sixteenth resistor R7 are connected in parallel, an output end is connected to the common end of the eighth capacitor E2 and the sixth capacitor C4, and the output end is connected with the power supply end of the electric energy metering chip and is used for supplying power to the electric energy metering chip.
Specifically, the tenth resistor R1 has a resistance of 68 ohms, the eleventh resistor R2 has a resistance of 1000 kiloohms, the twelfth resistor R3 has a resistance of 471 ohms, the thirteenth resistor R4 has a resistance of 1 kiloohm, the fourteenth resistor R5 has a resistance of 10 kiloohms, the fifteenth resistor R6 has a resistance of 2 kiloohms, and the sixteenth resistor R7 has a resistance of 1 kiloohm.
Through the arrangement, a resistance-capacitance voltage reduction circuit is formed to provide 3.3V voltage for the electric energy metering chip so as to ensure the normal operation of the electric energy metering chip.
In a second aspect, the present application further provides an air conditioner, where the air conditioner is provided with a circuit for preventing voltage measurement errors.
The circuit for preventing the voltage measurement error is arranged in the air conditioner, so that the power supply voltage can be effectively and stably detected.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A circuit for preventing voltage measurement errors for detecting a power supply voltage of an air conditioner, comprising:
the voltage division module (100) is connected with a power supply, and the voltage division module (100) comprises one or more voltage division resistors;
the conversion module (200) is connected with at least one voltage dividing resistor in the voltage dividing module (100) in parallel, the conversion module (200) at least comprises an electric energy metering chip and a first capacitor (C6), the electric energy metering chip is at least provided with a power supply end, an electric signal input end, a frequency output end and a grounding end, the first capacitor (C6) is connected with at least one voltage dividing resistor in parallel, and the electric signal input end is connected between the first capacitor (C6) and the voltage dividing resistor;
the photoelectric isolation module (300) is at least provided with an anode, a cathode, an emitter and a collector, wherein the anode is connected with the frequency output end, the cathode is connected with the grounding end, the emitter is grounded, and the collector is used for outputting a frequency signal.
2. A circuit for preventing voltage measurement errors according to claim 1, characterized in that the voltage dividing resistor comprises at least a radio frequency resistor, the conversion module (200) being connected in parallel with the radio frequency resistor.
3. The circuit for preventing voltage measurement errors according to claim 2, wherein the voltage dividing resistor comprises a first resistor (R12), a second resistor (R13), a third resistor (R14), a fourth resistor (R15) and a fifth resistor (R16) which are connected in series, the resistance values of the first resistor (R12), the second resistor (R13), the third resistor (R14) and the fourth resistor (R15) are 300 kilo ohms, the fifth resistor (R16) is the radio frequency resistor, and the resistance value of the fifth resistor (R16) is 560 ohms.
4. A circuit for preventing voltage measurement errors according to claim 1, characterized in that a sixth resistor (R10) is connected between the anode and the frequency output, the resistance value of the sixth resistor (R10) being 680 ohms.
5. A circuit for preventing voltage measurement errors according to claim 1, characterized in that it further comprises a second capacitor (C5), one end of said second capacitor (C5) being connected to said collector and the other end being connected to the emitter.
6. The circuit for preventing voltage measurement errors according to claim 5, characterized in that a seventh resistor (R11) is arranged between the second capacitor (C5) and the collector, the resistance value of the seventh resistor (R11) is 101 ohms, and a signal output end is connected between the seventh resistor (R11) and the second capacitor (C5) for outputting a frequency signal.
7. The circuit for preventing voltage measurement errors according to claim 6, wherein an eighth resistor (R9) is further arranged between the seventh resistor (R11) and the collector, one end of the eighth resistor (R9) is connected between the seventh resistor (R11) and the collector, the other end is connected with a 5 volt power supply, and the resistance value of the eighth resistor (R9) is 4.7 kiloohms.
8. The circuit for preventing voltage measurement errors according to claim 1, wherein the power supply end is connected with a 3.3 volt power supply, an effective value output end is further arranged on the electric energy metering chip, the effective value output end is connected with a ninth resistor (R8), the resistance value of the ninth resistor (R8) is 1 kiloohm, and the other end of the ninth resistor (R8) is connected with the 3.3 volt power supply.
9. A circuit for preventing voltage measurement errors according to claim 1, wherein the power supply terminal is connected with a power supply circuit, the power supply circuit comprising:
a tenth resistor (R1), an eleventh resistor (R2), a twelfth resistor (R3), a thirteenth resistor (R4), a fourteenth resistor (R5), a fifteenth resistor (R6), a sixteenth resistor (R7), a third capacitor (C1), a fourth capacitor (C2), a fifth capacitor (C3), a sixth capacitor (C4), a seventh capacitor (E1), an eighth capacitor (E2), a first diode (D1), a second diode (D2), an adjustable shunt regulator having three terminals, and a first transistor (Q1);
the adjustable shunt regulator is provided with three wiring terminals, namely an anode, a cathode and a reference terminal;
one end of the tenth resistor (R1) is connected with a live wire, the other end of the eleventh resistor (R2) is connected with the third capacitor (C1), the other end of the third capacitor (C1) is connected with the first diode (D1), the other end of the first diode (D1) is connected with the twelfth resistor (R3), one end of the twelfth resistor (R3) is connected with a cathode of the adjustable shunt regulator, an anode of the adjustable shunt regulator is connected with a zero line, one end of the eleventh resistor (R2) is connected between the tenth resistor (R1) and the third capacitor, the other end of the eleventh resistor (R2) is connected between the third capacitor (C1) and the first diode (D1), one end of the second diode (D2) is connected between the third capacitor (C1), the twelfth resistor (R3) and the first diode (D1), the other end of the twelfth resistor (R3) is connected with a zero line, one end of the seventh resistor (E1) is connected between the first diode (R1) and the twelfth resistor (R3), the other end of the eleventh resistor (E1) is connected between the twelfth resistor (R3) and the fourth resistor (C1), the other end of the eleventh resistor (D) is connected between the twelfth resistor (R3) and the twelfth resistor (D1), the other end of the fourteenth resistor (R5) is connected with the reference end of the adjustable shunt regulator, the collector of the first triode (Q1) is connected between the twelfth resistor (R3) and the first diode (D1), the base is connected between the twelfth resistor (R3) and the adjustable shunt regulator, the emitter is connected with a zero line, the thirteenth resistor (R4), the fifteenth resistor (R6) and the sixteenth resistor (R7) are sequentially connected between the emitter and the zero line, a wire is connected between the fifteenth resistor (R6) and the sixteenth resistor (R7), and a wire is connected between the fourteenth resistor (R5) and the adjustable shunt regulator, the eighth capacitor (E2) is connected with the thirteenth resistor (R4), the fifteenth resistor (R6) and the sixteenth resistor (R7) in parallel, the sixth capacitor (C4) is connected with the thirteenth resistor (R4), the fifteenth resistor (R6), the sixteenth resistor (R7) is connected with the power supply end in parallel, and the power supply end is connected with the power supply end of the power meter chip (C4).
10. An air conditioner provided with a circuit for preventing a voltage measurement error according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630433.6U CN220207733U (en) | 2023-06-26 | 2023-06-26 | Circuit for preventing voltage measurement error and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630433.6U CN220207733U (en) | 2023-06-26 | 2023-06-26 | Circuit for preventing voltage measurement error and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220207733U true CN220207733U (en) | 2023-12-19 |
Family
ID=89142016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321630433.6U Active CN220207733U (en) | 2023-06-26 | 2023-06-26 | Circuit for preventing voltage measurement error and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220207733U (en) |
-
2023
- 2023-06-26 CN CN202321630433.6U patent/CN220207733U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100501436C (en) | Electric resistance loading system | |
| US9176178B2 (en) | Battery simulation circuit | |
| CN204101715U (en) | A kind of counter of lightning arrester tester calibration device | |
| CN104237831A (en) | Set for calibrating tester of arrester counter | |
| CN101308172B (en) | Current integration type power detection device and power checking module | |
| CN107219402B (en) | A kind of circuit for quick measurement of DC resistance for power module port | |
| CN101334429B (en) | Surge electric current test circuit | |
| CN105068016A (en) | Battery power display control method and battery power display control circuit | |
| US20130328405A1 (en) | Ground test circuit | |
| CN104459305A (en) | Power detection circuit | |
| CN220207733U (en) | Circuit for preventing voltage measurement error and air conditioner | |
| CN102768078A (en) | Automatic resistance compensation method for temperature-measuring conductors for two-wire thermal resistor | |
| CN208140791U (en) | A kind of zero-detection circuit | |
| CN213069107U (en) | Current acquisition circuit and power battery based on single current sensor | |
| CN208969163U (en) | Electric energy metering device and electrical energy measurement processing module, the electrical parameter detection circuit of voltage detecting circuit | |
| CN209356582U (en) | A kind of resistance capacitance accurate measurement circuit | |
| CN221669602U (en) | Pre-charging circuit of fan module board and air conditioner | |
| CN200941111Y (en) | Neutral point resistance information detection recorder | |
| CN203502484U (en) | Abnormal overvoltage online detection device | |
| CN210572476U (en) | IC power supply detection circuit | |
| CN209372968U (en) | A kind of high-acruracy survey resistance capacitance system | |
| CN117439607B (en) | Universal analog quantity acquisition circuit | |
| CN104655934A (en) | Capacitance value measurement circuit and method | |
| CN209311581U (en) | A kind of simple digital control low-frequency sweep instrument device | |
| CN216747927U (en) | Testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |