CN109239446B - Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof - Google Patents
Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof Download PDFInfo
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- CN109239446B CN109239446B CN201810880091.0A CN201810880091A CN109239446B CN 109239446 B CN109239446 B CN 109239446B CN 201810880091 A CN201810880091 A CN 201810880091A CN 109239446 B CN109239446 B CN 109239446B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
- G01R19/1658—AC voltage or recurrent signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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Abstract
The invention provides an alternating current overvoltage detection circuit, an air conditioner indoor unit and a control panel thereof, wherein the alternating current overvoltage detection circuit comprises: a first input terminal and a second input terminal for receiving an input alternating current electrical signal; a detection signal output end; and the detection module is respectively connected with the first input end, the second input end and the detection signal output end and is used for detecting whether the peak value of the alternating current signal is greater than a set voltage threshold value or not, if so, a pulse signal is output to the detection signal output end, and if not, a single level signal is output to the detection signal output end. The alternating current overvoltage detection circuit, the air conditioner indoor unit and the control panel thereof have the advantages of simple detection on the alternating current power supply voltage input into the air conditioner outdoor unit, simple realization and low cost.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to an alternating current overvoltage detection circuit, an air conditioner indoor unit and a control panel thereof.
Background
The power supply of the outdoor unit of the air conditioner is usually controlled by the indoor unit, and when the voltage of an externally input alternating current power supply is too high, the driving module of a compressor and the driving module of a fan of the outdoor unit are easily damaged, and even the compressor and the fan are damaged. In order to avoid these phenomena, it is necessary to detect the ac power voltage inputted to the indoor unit, and when the ac power voltage inputted from the outside is too high, the power supply to the outdoor unit is stopped, and the display panel indicates an overvoltage failure to stop the operation of the air conditioner.
In the related art, there are generally two methods for detecting the ac power voltage input to the outdoor unit of the air conditioner.
One method is as follows: a rectification circuit is added in the indoor unit to convert input alternating current power supply voltage into direct current voltage, then the direct current voltage is divided into low voltage by a group of voltage division circuits and then is connected to an AD port of a chip, the current input alternating current voltage value is determined by AD sampling of the chip, and whether alternating current overvoltage protection occurs or not is judged according to the voltage value. The method firstly rectifies and then carries out voltage reduction treatment, or firstly reduces the voltage and then rectifies, the detection method is complex, and in addition, a rectifying circuit is required to be added, so that the cost is increased, and the realization difficulty is increased.
The other method comprises the following steps: the overvoltage detection circuit is characterized in that a voltage regulator tube is used for rectifying, then a bidirectional optocoupler is used for generating square waves, and overvoltage detection is carried out through a judgment cycle when the periods of the square waves generated by the voltage regulator tube under the conditions of no breakdown (no overvoltage) and breakdown (overvoltage) are different. The method needs to calculate the period of the generated square wave, increases the calculation load of a Micro Control Unit (MCU), makes the detection method complicated, and increases the difficulty of software programming and the difficulty of detection realization.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide an ac overvoltage detection circuit, which is capable of easily detecting an ac power voltage input to an outdoor unit of an air conditioner, and has advantages of simple implementation and low cost.
The second purpose of the invention is to provide a control panel of an air conditioner indoor unit.
The third purpose of the invention is to provide an air conditioner indoor unit.
A fourth object of the present invention is to provide an air conditioner.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides an ac overvoltage detection circuit, including:
a first input terminal and a second input terminal for receiving an input alternating current electrical signal;
a detection signal output end;
the detection module is respectively connected with the first input end, the second input end and the detection signal output end and is used for detecting whether the peak value of the alternating current signal is larger than a set voltage threshold value or not, if so, the detection module outputs a pulse signal to the detection signal output end, and if not, the detection module outputs a single level signal to the detection signal output end.
According to the alternating current overvoltage detection circuit provided by the embodiment of the invention, after the first input end and the second input end receive the input alternating current electric signals, the detection module detects whether the peak value of the alternating current electric signals is larger than the set voltage threshold value, if so, the detection module outputs pulse signals to the detection signal output end, and if not, the detection module outputs single level signals to the detection signal output end. This detection circuitry need not to increase rectifier circuit, therefore low cost to, only need detect alternating current signal through detection module, then can judge whether too high of the alternating current mains voltage of input through signal output's output signal, consequently, this alternating current overvoltage detection circuitry still has to detect simply, realizes simple advantage.
According to an embodiment of the invention, the detection signal output is connected to an input/output port of the control unit.
According to one embodiment of the invention, the detection module comprises: the detection unit is respectively connected with the first input end and the second input end and is used for detecting whether the alternating current signal is larger than the set voltage threshold value; the base electrode of the first driving tube is connected with the detection unit, and the emitting electrode of the first driving tube is respectively connected with a first direct-current power supply and the first input end and is used for conducting when the detection unit detects that the voltage of the first input end is greater than that of the second input end and the actual value of the alternating-current signal is greater than the set voltage threshold value; the input end of the photoelectric coupler is connected with the collector electrode of the first driving tube, the output end of the photoelectric coupler is connected with the detection signal output end, and the photoelectric coupler is used for outputting a high level signal to the detection signal output end when the first driving tube is conducted, and outputting a low level signal to the detection signal output end when the first driving tube is cut off.
According to one embodiment of the invention, the detection unit comprises: a first divider resistor, a first end of the first divider resistor being connected to the first input terminal; a first end of the first divider resistor is connected with a second end of the second divider resistor; the anode of the rectifying diode is connected with the second end of the second voltage-dividing resistor, and the cathode of the rectifying diode is connected with the second input end; and the anode of the voltage stabilizing diode is connected with the second end of the first divider resistor, and the cathode of the voltage stabilizing diode is connected with the base of the first driving tube.
According to an embodiment of the invention, the detection unit further comprises: and the anode of the voltage stabilizing diode is connected with the second end of the first divider resistor through the first current limiting resistor.
According to an embodiment of the invention, the detection circuit further comprises: and the collector of the second driving tube is connected with the cathode of the voltage stabilizing diode, the emitter of the second driving tube is connected with the anode of the voltage stabilizing diode, and the base of the second driving tube is connected with the collector of the first driving tube.
According to an embodiment of the invention, the detection circuit further comprises: and the base electrode of the second driving tube is connected with the collector electrode of the first driving tube through the second current-limiting resistor.
According to an embodiment of the invention, the detection circuit further comprises: and the first end of the capacitor is connected with the cathode of the voltage stabilizing diode, and the second end of the capacitor is connected with the emitter of the first driving tube.
According to an embodiment of the invention, the detection circuit further comprises: and the collector of the first driving tube is connected with the input end of the photoelectric coupler through the third current-limiting resistor.
According to an embodiment of the invention, the detection circuit further comprises: and the output end of the photoelectric coupler is grounded through the fourth current limiting resistor.
In order to achieve the above object, a second aspect of the present invention provides a control panel for an air conditioner internal unit, including: an ac overvoltage detection circuit according to an embodiment of the first aspect of the invention.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an air conditioner internal unit, including: the control panel of the air conditioner indoor unit according to the embodiment of the second aspect of the invention.
To achieve the above object, a fourth aspect of the present invention provides an air conditioner, including: an air conditioner indoor unit according to an embodiment of the third aspect of the present invention.
Drawings
Fig. 1 is a schematic configuration diagram of an ac overvoltage detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an alternating current overvoltage detection circuit according to another embodiment of the present invention;
fig. 3 is a circuit diagram of an alternating current overvoltage detection circuit according to another embodiment of the present invention;
fig. 4 is a structural view of a control panel of an air conditioner indoor unit according to an embodiment of the present invention;
fig. 5 is a structural view of an air conditioner indoor unit according to an embodiment of the present invention;
fig. 6 is a structural view of an air conditioner according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The ac overvoltage detection circuit, the air conditioner internal unit, and the control board thereof according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic configuration diagram of an ac overvoltage detection circuit according to an embodiment of the present invention. As shown in fig. 1, the ac overvoltage detection circuit according to the embodiment of the present invention includes:
a first input terminal N and a second input terminal L for receiving an input alternating current signal.
And detecting a signal output end MCU _ IO.
The detection module 11, the detection module 11 is connected with the first input end N, the second input end L and the detection signal output end MCU _ IO respectively, and is configured to detect whether a peak value of the alternating current signal is greater than a set voltage threshold, if so, the detection module 11 outputs a pulse signal to the detection signal output end MCU _ IO, and if not, the detection module 11 outputs a single level signal to the detection signal output end MCU _ IO.
In the embodiment of the present invention, the first input terminal N and the second input terminal L are configured to receive an input ac signal, after the first input terminal N and the second input terminal L receive the input ac signal, the detection module 11 detects the input ac signal, a set voltage threshold may be preset, the detection module 11 determines whether a peak value of the detected ac signal is greater than the set voltage threshold, if the peak value of the ac signal is greater than the set voltage threshold, it indicates that the voltage of the input ac signal is too high, the detection module 11 outputs a pulse signal to the detection signal output terminal MCU _ IO, for example, when an actual value of the ac signal is equal to or less than the set voltage threshold, the detection module 11 outputs a low level signal to the detection signal output terminal, and when the actual value of the ac signal is greater than the set voltage threshold, the detection module 11 outputs a high level signal to the detection signal output terminal, therefore, the detection module 11 outputs a pulse signal to the detection signal output end, if the peak value of the alternating current signal is smaller than the set voltage threshold value, the input alternating current signal is in the normal working range, the detection module 11 outputs a single level signal to the detection signal output end MCU _ IO, and whether the input alternating current power supply voltage is too high can be judged by judging whether the output signal of the signal output end MCU _ IO is the pulse signal.
According to the alternating current overvoltage detection circuit provided by the embodiment of the invention, after the first input end and the second input end receive the input alternating current electric signals, the detection module detects whether the peak value of the alternating current electric signals is larger than the set voltage threshold value, if so, the detection module outputs pulse signals to the detection signal output end, and if not, the detection module outputs single level signals to the detection signal output end. The detection circuit does not need to be additionally provided with a rectification circuit, so that the cost is low, only the detection module is needed to detect the alternating current signal, and then whether the input alternating current power supply voltage is too high or not can be judged through the output signal of the signal output end, so that the method has the advantages of simplicity in detection and simplicity in implementation.
Fig. 2 is a circuit diagram of an ac overvoltage detection circuit according to another embodiment of the present invention, as shown in fig. 2, based on the embodiment shown in fig. 1, a detection signal output end MCU _ IO is connected to an input/output port (i.e., an I/O port) of a control unit (e.g., an MCU), so as to avoid occupying an analog input AD port of the control unit (e.g., the MCU) and causing a shortage of resources of the AD port.
Wherein, detection module 11 includes:
and the detection unit 12, the detection unit 12 is respectively connected with the first input end N and the second input end L, and is used for detecting whether the alternating current signal is greater than a set voltage threshold value.
In the embodiment of the present invention, a set voltage threshold is preset, and the detection unit 12 compares the detected ac signal with the set voltage threshold to determine whether the detected ac signal is greater than the set voltage threshold.
The base electrode of the first driving tube Q1 and the base electrode of the first driving tube Q1 are connected with the detection unit 12, and the emitter electrode of the first driving tube Q1 is connected with the first direct current power supply and the first input end N respectively, and is used for conducting when the detection unit 12 detects that the voltage of the first input end N is greater than the voltage of the second input end L and the actual value of the alternating current signal is greater than the set voltage threshold value.
Photoelectric coupler IC1, photoelectric coupler IC 1's input and first drive tube Q1's collecting electrode are connected, photoelectric coupler IC 1's output and detection signal output part MCU _ IO are connected, when being used for first drive tube Q1 switches on, photoelectric coupler IC1 exports high level signal to detection signal output part MCU _ IO, when first drive tube Q1 ends, photoelectric coupler IC1 exports low level signal to detection signal output part MCU _ IO.
In the embodiment of the present invention, the emitters of the first driving tube Q1 are respectively connected to a first dc power supply (e.g., +24V in fig. 2) and the first input terminal N, and can be used to control the on/off of the circuit connecting the photocoupler IC1 with the first dc power supply and the first input terminal N. When the detection unit 12 detects that the voltage of the first input end N is greater than the voltage of the second input end L and the actual value of the alternating current signal is greater than the set voltage threshold, the Q1 is turned on, and the photoelectric coupler IC1 is communicated with the first direct current power supply and the first input end N; when the detecting unit 12 detects that the voltage of the first input terminal N is less than the voltage of the second input terminal L, or the actual value of the ac signal is less than the set voltage threshold, the Q1 is turned off (i.e., cut off), and the photocoupler IC1 is not connected to the first dc power supply and the first input terminal N. That is, when the peak value of the ac signal is greater than the set voltage threshold value, Q1 is turned on only in the set period around the peak value of the half cycle, and Q1 is turned off in the other period of the half cycle and the other half cycle.
In the embodiment of the present invention, the photocoupler IC1 is used for outputting a signal to the signal output terminal MCU _ IO. When the Q1 is conducted, the photoelectric coupler IC1 is communicated with the first direct-current power supply and the first input end N, the LED in the photoelectric coupler IC1 emits light, and the emitter of the photoelectric coupler IC1 can output a high level to the signal output end MCU _ IO; when Q1 turned off, photoelectric coupler IC1 and first direct current power supply and first input end N did not communicate, and LED does not give out light in photoelectric coupler IC1, and then photoelectric coupler IC 1's emitter continues to output low level to detection signal output MCU _ IO to when the peak value of alternating current signal was greater than the settlement voltage threshold, photoelectric coupler IC1 output pulse signal to detection signal output MCU _ IO.
Wherein the detection unit 12 includes:
a first divider resistor R1, wherein a first end of the first divider resistor R1 is connected with the first input end N;
a first end of the second divider resistor R2 is connected to a second end of the first divider resistor R1;
in the embodiment of the present invention, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 divide the voltage between the first input terminal N and the second input terminal L in the circuit, so that the voltage at the second end of the first voltage dividing resistor R1 is within a proper range.
The anode of the rectifying diode D1 is connected to the second end of the second voltage-dividing resistor R2, and the cathode of the rectifying diode D1 is connected to the second input terminal L;
and the anode of the voltage stabilizing diode DZ is connected with the second end of the first divider resistor R1, and the cathode of the voltage stabilizing diode DZ is connected with the base of the first driving tube Q1.
In the embodiment of the present invention, the regulated voltage value of the zener diode DZ is VZ, and the peak value of the protection voltage between the first input terminal N and the second input terminal L is U. As a possible embodiment, the relationship between U and VZ may be (VZ +0.7V) × (R1+ R2)/R1+ 0.7V. The peak value U of the protection voltage, i.e. the set voltage threshold, can be changed by adjusting the resistances of the first voltage divider resistor R1 and the second voltage divider resistor R2 or the regulated voltage VZ of the zener diode DZ. When the voltage of the first input terminal N is greater than the voltage of the second input terminal L and the actual value of the input ac power voltage is greater than U, the zener diode DZ breaks down in the reverse direction, so that the base of the first driving transistor Q1 generates a current, and the first driving transistor Q1 is turned on. When the voltage of the first input terminal N is less than the voltage of the second input terminal L, or the actual value of the input ac power voltage is equal to or less than U, the zener diode DZ does not break down in the reverse direction, the base of the first driving transistor Q1 does not generate current, and the first driving transistor Q1 is turned off.
Wherein, the detecting unit 12 further includes:
the anode of the zener diode DZ is connected to the second terminal of the first divider resistor R1 through a first current limiting resistor R3, and the first current limiting resistor R3.
In the embodiment of the invention, the first current limiting resistor R3 may be used to limit the magnitude of the current of the branch where the first current limiting resistor R3 is located, so as to prevent the electronic components connected in series from being burned down due to the excessive current.
Wherein, this detection circuitry still includes:
and a collector of the second driving tube Q2, a collector of the second driving tube Q2 is connected with a cathode of the voltage stabilizing diode DZ, an emitter of the second driving tube Q2 is connected with an anode of the voltage stabilizing diode DZ, and a base of the second driving tube Q2 is connected with a collector of the first driving tube Q1.
In the embodiment of the present invention, when the voltage of the first input terminal N is greater than the voltage of the second input terminal L, and the actual value of the input ac power voltage is greater than U, the zener diode DZ breaks down in the reverse direction, so that the base of the first driving tube Q1 generates current, and the first driving tube Q1 is turned on, and the emitter junction of the second driving tube Q2 is biased forward, and the second driving tube Q2 is turned on, and the first driving tube Q1 is further turned on, and as long as the voltage of the first input terminal N is greater than the voltage of the second input terminal L, the on state of the first driving tube Q1 can be maintained until the time when the voltages of the first input terminal N and the second input terminal L are reversed, the output square wave pulse width is greater than 1/4 voltage period, and accurate detection of the output pulse signal is ensured.
Wherein, this detection circuitry still includes: and the base electrode of the second driving tube Q2 is connected with the collector electrode of the first driving tube Q1 through a second current limiting resistor R4 by the second current limiting resistor R4.
In the embodiment of the present invention, the second current limiting resistor R4 may be used to limit the magnitude of the current of the branch where the current is located, so as to prevent the electronic components connected in series from being burned due to an excessive current.
Wherein, this detection circuitry still includes: and the collector of the first driving tube Q1 is connected with the input end of the photocoupler IC1 through the third current limiting resistor R5 by a third current limiting resistor R5.
In the embodiment of the present invention, the third current limiting resistor R5 may be used to limit the magnitude of the current of the branch where the third current limiting resistor R5 is located, so as to prevent the electronic components connected in series from being burned down due to an excessive current.
Wherein, this detection circuitry still includes: and the output end of the photoelectric coupler IC1 is grounded through a fourth current limiting resistor R6 and a fourth current limiting resistor R6.
In the embodiment of the present invention, the fourth current limiting resistor R6 may be used to limit the magnitude of the current of the branch where the current is located, so as to prevent the electronic components connected in series from being burned due to an excessive current.
The working principle of the ac overvoltage detection circuit shown in fig. 2 will be described in detail below by taking as an example a detection circuit in which the ac power supply voltage is 100V, the frequency of the input power supply is 50Hz, the regulated voltage value VZ of the regulator diode DZ is 20V, the resistance of the first voltage dividing resistor R1 is 42k Ω, and the resistance of the second voltage dividing resistor R2 is 300k Ω:
through the relationship between the peak value U of the protection voltage and the regulated voltage value VZ of the zener diode DZ, it can be calculated that the peak value U of the protection voltage is (20V +0.7V) × (42k Ω +300k Ω)/42k Ω +0.7V ≈ 169V, that is, the voltage threshold is set to 169V, and the effective value of the corresponding input ac power supply voltage is 120V, that is, the input ac power supply voltage is allowed to fluctuate by 20%. The power supply voltage period is 1s/50Hz and 2 ms.
When the voltage of the first input terminal N is less than the voltage of the second input terminal L, or the actual value of the input ac power voltage is equal to or less than U, the zener diode DZ does not break down in the reverse direction, the base of the first driving transistor Q1 does not generate current, and the first driving transistor Q1 is turned off. The photocoupler IC1 is not connected to the first dc power supply and the first input terminal N. The LED in the photocoupler IC1 does not emit light, and the emitter of the photocoupler IC1 continues to output a low level to the detection signal output terminal MCU _ IO.
When the voltage of the first input end N is greater than the voltage of the second input end L, and the actual value of the input alternating current power supply voltage is greater than U, the zener diode DZ can break down in the reverse direction, thereby the base of the first driving tube Q1 generates current, and further the first driving tube Q1 is turned on, the photoelectric coupler IC1 is communicated with the first direct current power supply and the first input end N, the LED in the photoelectric coupler IC1 emits light, and further the emitter high level of the photoelectric coupler IC1 is output to the signal output end MCU _ IO, so that when the peak value of the alternating current signal is greater than the set voltage threshold value, the photoelectric coupler IC1 outputs a pulse signal to the detection signal output end MCU _ IO. When the Q1 is turned on, the emitter junction of the second driving tube Q2 is forward biased, and the second driving tube Q2 is turned on, so as to promote the turn-on of the first driving tube Q1, as long as the voltage of the first input end N is greater than the voltage of the second input end L, the turn-on state of the first driving tube Q1 can be maintained until the time when the voltages of the first input end N and the second input end L are reversed, so that the output square wave pulse width is greater than 1/4 voltage period, that is, greater than 5ms, and the accurate detection of the output pulse signal is ensured.
Based on the working principle, the alternating current signal is detected only through the detection module, whether the input alternating current power supply voltage is too high can be judged by judging whether the output signal of the signal output end is the pulse signal, and when the input alternating current power supply voltage is too high, the duration of the pulse signal is long enough, namely, the duration is greater than 1/4 voltage period, and the detection of the pulse signal output by the signal output end MCU _ IO is ensured. And the detection circuit has simple composition structure, so the cost is low.
According to the alternating current overvoltage detection circuit provided by the embodiment of the invention, after the first input end and the second input end receive the input alternating current electric signals, the detection module detects whether the peak value of the alternating current electric signals is larger than the set voltage threshold value, if so, the detection module outputs pulse signals to the detection signal output end, and if not, the detection module outputs single level signals to the detection signal output end. The alternating current signal is detected only through the detection module, and then whether the input alternating current power supply voltage is too high can be judged through the output signal of the signal output end, so that the method has the advantages of simplicity in detection and simplicity in implementation. And the detection circuit does not need to be additionally provided with a rectifying circuit and has simple composition structure, so the cost is low.
Fig. 3 is a circuit diagram of an ac overvoltage detection circuit according to another embodiment of the present invention, as shown in fig. 3, and based on the embodiment shown in fig. 2, the detection circuit further includes:
and a first end of the capacitor C1 and a first end of the capacitor C1 are connected with the cathode of the voltage stabilizing diode DZ, and a second end of the capacitor is connected with the emitter of the first driving tube Q1.
In the embodiment of the invention, the capacitor C1 is connected in parallel between the emitter and the base of the first driving tube Q1 and can be used for filtering noise waves and improving the anti-interference performance of the detection circuit.
Other methods for detecting whether the input ac power voltage is too high are the same as those of the embodiment shown in fig. 2, and are not described here again.
According to the alternating current overvoltage detection circuit provided by the embodiment of the invention, after the first input end and the second input end receive the input alternating current electric signals, the detection module detects whether the peak value of the alternating current electric signals is larger than the set voltage threshold value, if so, the detection module outputs pulse signals to the detection signal output end, and if not, the detection module outputs single level signals to the detection signal output end. The alternating current signal is detected only through the detection module, and then whether the input alternating current power supply voltage is too high can be judged through the output signal of the signal output end, so that the method has the advantages of simplicity in detection and simplicity in implementation. And the detection circuit does not need to be additionally provided with a rectifying circuit and has simple composition structure, so the cost is low. In addition, the anti-interference performance of the detection circuit can be improved by adding a capacitor for filtering out noise waves.
In order to implement the above embodiments, the embodiment of the present invention further provides a control board 40 of an air conditioner internal unit, as shown in fig. 4, including an ac overvoltage detection circuit 41 as shown in the above embodiments.
In order to implement the above embodiment, the embodiment of the present invention further provides an air conditioner internal unit 42, as shown in fig. 5, including a control board 40 of the air conditioner internal unit shown in the above embodiment.
In order to implement the above embodiment, an air conditioner 43 is further provided in an embodiment of the present invention, as shown in fig. 6, including an air conditioner internal unit 42 as shown in the above embodiment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An alternating current overvoltage detection circuit, comprising:
a first input terminal and a second input terminal for receiving an input alternating current electrical signal;
a detection signal output end;
the detection module is respectively connected with the first input end, the second input end and the detection signal output end and is used for detecting whether the peak value of the alternating current signal is larger than a set voltage threshold value or not, if so, the detection module outputs a pulse signal to the detection signal output end, and if not, the detection module outputs a single level signal to the detection signal output end;
wherein the detection module comprises:
the detection unit is respectively connected with the first input end and the second input end and is used for detecting whether the alternating current signal is larger than the set voltage threshold value;
the base electrode of the first driving tube is connected with the detection unit, and the emitting electrode of the first driving tube is respectively connected with a first direct-current power supply and the first input end and is used for conducting when the detection unit detects that the voltage of the first input end is greater than that of the second input end and the actual value of the alternating-current signal is greater than the set voltage threshold value;
the input end of the photoelectric coupler is connected with the collector electrode of the first driving tube, the output end of the photoelectric coupler is connected with the detection signal output end, and the photoelectric coupler is used for outputting a high-level signal to the detection signal output end when the first driving tube is conducted and outputting a low-level signal to the detection signal output end when the first driving tube is cut off;
a first divider resistor, a first end of the first divider resistor being connected to the first input terminal;
a first end of the first divider resistor is connected with a second end of the second divider resistor;
the anode of the rectifying diode is connected with the second end of the second voltage-dividing resistor, and the cathode of the rectifying diode is connected with the second input end;
the anode of the voltage stabilizing diode is connected with the second end of the first divider resistor, and the cathode of the voltage stabilizing diode is connected with the base of the first driving tube;
and the collector electrode of the second driving tube is connected with the cathode of the voltage stabilizing diode, the emitter electrode of the second driving tube is connected with the anode of the voltage stabilizing diode, and the base electrode of the second driving tube is connected with the collector electrode of the first driving tube.
2. The ac overvoltage detection circuit according to claim 1, wherein the detection signal output terminal is connected to an input/output port of the control unit.
3. The ac overvoltage detection circuit according to claim 1, wherein the detection unit further includes:
and the anode of the voltage stabilizing diode is connected with the second end of the first divider resistor through the first current limiting resistor.
4. The ac overvoltage detection circuit according to claim 1, further comprising:
and the base electrode of the second driving tube is connected with the collector electrode of the first driving tube through the second current-limiting resistor.
5. The ac overvoltage detection circuit according to claim 1, further comprising:
and the first end of the capacitor is connected with the cathode of the voltage stabilizing diode, and the second end of the capacitor is connected with the emitter of the first driving tube.
6. The ac overvoltage detection circuit according to claim 1, further comprising:
and the collector of the first driving tube is connected with the input end of the photoelectric coupler through the third current-limiting resistor.
7. The ac overvoltage detection circuit according to claim 1, further comprising:
and the output end of the photoelectric coupler is grounded through the fourth current limiting resistor.
8. A control panel for an air conditioner indoor unit, comprising: an alternating current overvoltage detection circuit according to any of claims 1 to 7.
9. An air conditioner indoor unit, comprising: a control panel for an air conditioner indoor unit according to claim 8.
10. An air conditioner, comprising: an air conditioner indoor unit as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880091.0A CN109239446B (en) | 2018-08-03 | 2018-08-03 | Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810880091.0A CN109239446B (en) | 2018-08-03 | 2018-08-03 | Alternating-current overvoltage detection circuit, air conditioner indoor unit and control panel thereof |
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| CN109239446A CN109239446A (en) | 2019-01-18 |
| CN109239446B true CN109239446B (en) | 2021-11-19 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112032981B (en) * | 2020-07-24 | 2021-10-22 | 广东积微科技有限公司 | Air conditioner indoor and outdoor unit communication circuit and air conditioner |
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