CN210602156U - Detection circuit of variable frequency air conditioner - Google Patents
Detection circuit of variable frequency air conditioner Download PDFInfo
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- CN210602156U CN210602156U CN201921116404.1U CN201921116404U CN210602156U CN 210602156 U CN210602156 U CN 210602156U CN 201921116404 U CN201921116404 U CN 201921116404U CN 210602156 U CN210602156 U CN 210602156U
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Abstract
The utility model discloses a detection circuit of a variable frequency air conditioner, which comprises a first voltage detection module, a first current detection module, a second voltage detection module, a second current detection module, a PWM detection module, an encoder, a power supply module, a processing module and a display module; the power module is respectively electrically connected with the processing module and the display module, the first voltage detection module, the first current detection module, the second voltage detection module, the second current detection module, the PWM detection module and the encoder are respectively connected with the input end of the processing module, and the output end of the processing module is connected with the display module. The utility model discloses a first voltage detection module, first current detection module, second voltage detection module, second current detection module PWM detection module and the encoder that set up detect inverter air conditioner's control circuit parameter everywhere respectively to discern inverter air conditioner control circuit's trouble position, and through display module output fault information.
Description
Technical Field
The utility model relates to a variable frequency air conditioner technical field, more specifically say and relate to a detection circuitry of variable frequency air conditioner.
Background
The air conditioners available on the market are mainly classified into two types, one is a fixed frequency air conditioner, and the other is a variable frequency air conditioner, wherein the variable frequency air conditioner refers to an air conditioner provided with an inverter for controlling and adjusting the rotating speed of a compressor.
The working principle of the frequency converter in the prior art is that an AC-DC module is used to convert 220V power frequency alternating current into direct current, an inverter is used to convert the direct current into alternating current with a certain frequency, and then a PWM controller outputs PWM signals with different frequencies to the inverter according to temperature or other control signals, thereby realizing the control function of the inverter for outputting the frequency of the alternating current.
However, in the conventional variable frequency air conditioner, the whole frequency converter is not provided with corresponding detection measures, so that even if the frequency converter fails, a specific fault position cannot be known, and the difficulty and time for maintenance are increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: a detection circuit of a variable frequency air conditioner is provided.
The utility model provides a solution of its technical problem is:
a detection circuit of a variable frequency air conditioner comprises:
the first voltage detection module is used for detecting the voltage of the commercial power input end;
the first current detection module is used for detecting the current of the commercial power input end;
the second voltage detection module is used for detecting the input voltage of the inverter;
the second current detection module is used for detecting the input current of the inverter;
the PWM detection module is used for detecting whether the PWM controller outputs a PWM signal or not;
an encoder for detecting rotation of the compressor;
the device comprises a power supply module, a processing module and a display module;
the power module is respectively electrically connected with the processing module and the display module, the first voltage detection module, the first current detection module, the second voltage detection module, the second current detection module, the PWM detection module and the encoder are respectively connected with the input end of the processing module, and the output end of the processing module is connected with the display module.
As a further improvement of the above technical solution, the detection circuit further includes a radio frequency communication module, an output end of the processing module is connected to an input end of the radio frequency communication module, and the radio frequency communication module includes a communication chip of type CC2530 and a peripheral circuit thereof.
As a further improvement of the above technical solution, the encoder is an incremental encoder.
As a further improvement of the above technical solution, the PWM detection module includes a capacitor C1, a resistor R4, and a voltage comparator, the capacitor C1 and the resistor R4 are connected in series between the output end of the PWM controller and the ground end, the input end of the voltage comparator is connected to the connection point between the capacitor C1 and the resistor R4, and the output end of the voltage comparator is connected to the input end of the processing module.
As a further improvement of the above technical solution, the power supply module includes an ac power supply unit, a dc power supply unit, a voltage regulator unit, a level conversion unit and a diode D1, the direct current power supply unit comprises a DC/DC voltage reduction chip and a peripheral circuit thereof, the DC/DC voltage reduction chip is provided with a starting pin for starting the operation of the chip, the output end of the alternating current power supply unit is respectively connected with the anode of the diode D1 and the input end of the level conversion unit, the output end of the level conversion unit is connected with the starting pin of the DC/DC voltage reduction chip, the cathode of the diode D1 is connected to the output terminal of the dc power supply unit and the input terminal of the voltage regulator unit, and the level conversion unit controls the level output to the starting pin of the DC/DC voltage reduction chip according to the existence of the output voltage of the alternating current power supply unit.
As a further improvement of the above technical solution, the level conversion unit includes a transistor Q1, a resistor R1, a resistor R2, and a resistor R3, the output terminal of the ac power supply unit is connected to the base of the transistor Q1 through the resistor R1, the emitter of the transistor Q1 is grounded, the resistor R2 and the resistor R3 are connected in series between the power supply terminal and the ground terminal, and the collector of the transistor Q1 is connected to the connection point of the resistor R2 and the resistor R3 and serves as the output terminal of the level conversion unit.
The utility model has the advantages that: the utility model discloses a first voltage detection module, first current detection module, second voltage detection module, second current detection module, PWM detection module and the encoder that set up detect inverter air conditioner's control circuit parameter everywhere respectively to discern inverter air conditioner control circuit's fault location, and through display module output fault information.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
Fig. 1 is a circuit module frame diagram of the present invention;
fig. 2 is a schematic diagram of a power module of the present invention;
fig. 3 is a schematic diagram of the PWM detection module of the present invention.
Detailed Description
The conception, specific structure, and technical effects of the present application will be described clearly and completely with reference to the accompanying drawings and embodiments, so that the purpose, features, and effects of the present application can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts based on the embodiments of the present application belong to the protection scope of the present application. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other. Finally, it should be noted that the terms "center, upper, lower, left, right, vertical, horizontal, inner, outer" and the like as used herein refer to an orientation or positional relationship based on the drawings, which is only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Referring to fig. 1 to 3, the present application discloses a detection circuit of an inverter air conditioner, a first embodiment of which includes:
the first voltage detection module is used for detecting the voltage of the commercial power input end;
the first current detection module is used for detecting the current of the commercial power input end;
the second voltage detection module is used for detecting the input voltage of the inverter;
the second current detection module is used for detecting the input current of the inverter;
the PWM detection module is used for detecting whether the PWM controller outputs a PWM signal or not;
an encoder for detecting rotation of the compressor;
the device comprises a power supply module, a processing module and a display module;
the power module is respectively electrically connected with the processing module and the display module, the first voltage detection module, the first current detection module, the second voltage detection module, the second current detection module, the PWM detection module and the encoder are respectively connected with the input end of the processing module, and the output end of the processing module is connected with the display module. Specifically, the first voltage detection module and the first current detection module preferentially select a voltage transformer and a current transformer respectively to realize a corresponding voltage and current detection function, the second voltage detection module can divide direct current by using a series resistor, the detection function of the input voltage of the inverter can be realized by detecting the potential between the series resistors, the second current detection module can realize a corresponding current detection function by using a combination of a resistor and a differential amplifier, the resistor is connected between the AC-DC module and the inverter, and the voltage drop of the resistor is detected by the differential amplifier. In the embodiment, parameters of each part of the control circuit of the variable frequency air conditioner are detected through the arranged first voltage detection module, the first current detection module, the second voltage detection module, the second current detection module and the encoder, so that the fault position of the control circuit of the variable frequency air conditioner is identified, and fault information is output through the display module, so that maintenance personnel can conveniently know the corresponding fault position.
Further as a preferred implementation manner, this embodiment is further configured with a radio frequency communication module, an output end of the processing module is connected to an input end of the radio frequency communication module, and the radio frequency communication module includes a communication chip with a model CC2530 and a peripheral circuit thereof.
Further, as a preferred implementation manner, in this embodiment, the encoder is an incremental encoder, and the encoder includes an encoder disk, and the encoder disk is installed at a rotating shaft of a motor in the compressor. Specifically, when the motor operates, the encoder converts the angular displacement into a periodic electric signal, converts the electric signal into a counting pulse, and transmits the counting pulse to the input end of the processing module.
Referring to fig. 3, as a further preferred embodiment, the PWM detection module in this embodiment includes a capacitor C1, a resistor R4, and a voltage comparator, the capacitor C1 and the resistor R4 are connected in series between the output end of the PWM controller and the ground end, the input end of the voltage comparator is connected to the connection point between the capacitor C1 and the resistor R4, and the output end of the voltage comparator is connected to the input end of the processing module.
Referring to fig. 2, as a further preferred embodiment, the power module in this embodiment includes an ac power supply unit, a dc power supply unit, a voltage regulator unit, a level shifter unit and a diode D1, the direct current power supply unit comprises a DC/DC voltage reduction chip and a peripheral circuit thereof, the DC/DC voltage reduction chip is provided with a starting pin for starting the operation of the chip, the output end of the alternating current power supply unit is respectively connected with the anode of the diode D1 and the input end of the level conversion unit, the output end of the level conversion unit is connected with the starting pin of the DC/DC voltage reduction chip, the cathode of the diode D1 is connected to the output terminal of the dc power supply unit and the input terminal of the voltage regulator unit, and the level conversion unit controls the level output to the starting pin of the DC/DC voltage reduction chip according to the existence of the output voltage of the alternating current power supply unit. Specifically, in this embodiment, the power module is configured with an ac power supply function and a dc power supply function, and in order to prevent the occurrence of a situation that the processing module cannot normally operate due to the damage of the ac power supply unit, the present embodiment is provided with a level conversion unit, when the ac power supply unit normally operates, the level conversion unit controls the dc power supply unit to stop operating, but when the ac power supply unit fails, the level conversion unit controls the dc power supply unit to start.
Further as a preferred implementation manner, in this embodiment, the level shifting unit includes a transistor Q1, a resistor R1, a resistor R2, and a resistor R3, the output terminal of the ac power supply unit is connected to the base of the transistor Q1 through the resistor R1, the emitter of the transistor Q1 is grounded, the resistor R2 and the resistor R3 are connected in series between the power supply terminal and the ground terminal, and the collector of the transistor Q1 is connected to the connection point of the resistor R2 and the resistor R3 and serves as the output terminal of the level shifting unit.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (6)
1. The detection circuit of the inverter air conditioner is characterized by comprising the following components:
the first voltage detection module is used for detecting the voltage of the commercial power input end;
the first current detection module is used for detecting the current of the commercial power input end;
the second voltage detection module is used for detecting the input voltage of the inverter;
the second current detection module is used for detecting the input current of the inverter;
the PWM detection module is used for detecting whether the PWM controller outputs a PWM signal or not;
an encoder for detecting rotation of the compressor;
the device comprises a power supply module, a processing module and a display module;
the power module is respectively electrically connected with the processing module and the display module, the first voltage detection module, the first current detection module, the second voltage detection module, the second current detection module, the PWM detection module and the encoder are respectively connected with the input end of the processing module, and the output end of the processing module is connected with the display module.
2. The detection circuit of the inverter air conditioner as claimed in claim 1, wherein: the radio frequency communication module is characterized by further comprising a radio frequency communication module, wherein the output end of the processing module is connected with the input end of the radio frequency communication module, and the radio frequency communication module comprises a communication chip with the model number of CC2530 and a peripheral circuit thereof.
3. The detection circuit of the inverter air conditioner as claimed in claim 1, wherein: the encoder is an incremental encoder.
4. The detection circuit of the inverter air conditioner as claimed in claim 1, wherein: the PWM detection module comprises a capacitor C1, a resistor R4 and a voltage comparator, wherein the capacitor C1 and the resistor R4 are connected between the output end of the PWM controller and the ground end in series, the input end of the voltage comparator is connected to the connection point between the capacitor C1 and the resistor R4, and the output end of the voltage comparator is connected with the input end of the processing module.
5. The detection circuit of the inverter air conditioner as claimed in claim 1, wherein: the power supply module comprises an alternating current power supply unit, a direct current power supply unit, a voltage stabilizing unit, a level conversion unit and a diode D1, wherein the direct current power supply unit comprises a DC/DC voltage reduction chip and a peripheral circuit thereof, the DC/DC voltage reduction chip is provided with a starting pin for starting the operation of the chip, the output end of the alternating current power supply unit is respectively connected with the anode of the diode D1 and the input end of the level conversion unit, the output end of the level conversion unit is connected with the starting pin of the DC/DC voltage reduction chip, the cathode of the diode D1 is respectively connected with the output end of the direct current power supply unit and the input end of the voltage stabilizing unit, and the level conversion unit controls the level of the starting pin which is output to the DC/DC voltage reduction chip according to the existence of the output.
6. The detection circuit of the inverter air conditioner as claimed in claim 5, wherein: the level conversion unit comprises a triode Q1, a resistor R1, a resistor R2 and a resistor R3, the output end of the alternating current power supply unit is connected with the base electrode of the triode Q1 through the resistor R1, the emitter electrode of the triode Q1 is grounded, the resistor R2 and the resistor R3 are connected between a power supply end and a ground end in series, and the collector electrode of the triode Q1 is connected with the connection point of the resistor R2 and the resistor R3 and serves as the output end of the level conversion unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921116404.1U CN210602156U (en) | 2019-07-16 | 2019-07-16 | Detection circuit of variable frequency air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921116404.1U CN210602156U (en) | 2019-07-16 | 2019-07-16 | Detection circuit of variable frequency air conditioner |
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| CN210602156U true CN210602156U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115930360A (en) * | 2022-12-07 | 2023-04-07 | 珠海格力电器股份有限公司 | Electric heater fault detection method and device and air conditioning equipment |
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2019
- 2019-07-16 CN CN201921116404.1U patent/CN210602156U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115930360A (en) * | 2022-12-07 | 2023-04-07 | 珠海格力电器股份有限公司 | Electric heater fault detection method and device and air conditioning equipment |
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