CN219831333U - AC/DC input detection device - Google Patents
AC/DC input detection device Download PDFInfo
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- CN219831333U CN219831333U CN202320430384.5U CN202320430384U CN219831333U CN 219831333 U CN219831333 U CN 219831333U CN 202320430384 U CN202320430384 U CN 202320430384U CN 219831333 U CN219831333 U CN 219831333U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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Abstract
The utility model discloses an AC/DC input detection device, which comprises an AC/DC input conditioning circuit, an AC phase-locked circuit, a phase-locked dead zone control circuit, an AC/DC signal screening circuit and an AC/DC signal output circuit which are sequentially connected and respectively connected with an auxiliary power supply circuit; the AC/DC input conditioning circuit converts an AC sinusoidal signal into a square wave signal with the same phase by modulating the voltage of the output end of the power supply, the AC phase-locking circuit performs filtering and locking, the phase-locking dead zone control circuit adds the square wave signal formed by the previous phase locking into dead zone time, the AC/DC signal output circuit compares the screened AC/DC input signal with a threshold value, and finally outputs 0V or 5V level as a criterion of AC/DC input. The phase-locked and dead zone control device can judge and screen alternating current/direct current signals, simultaneously realize the functions of phase locking and dead zone control of the alternating current signals, and has the characteristics of simple circuit, low cost, high reliability and low misjudgment rate.
Description
Technical Field
The utility model relates to a detection technology of a power supply with energy flowing in two directions, in particular to an alternating current-direct current input detection device.
Background
Along with the development of green and low-carbon technologies, the demands on energy bidirectional flowing power supplies in the market are higher and higher, wherein the energy bidirectional flowing power supplies are divided into direct current input and alternating current input modes in the process of grid connection and energy feedback, at present, a single chip microcomputer is adopted for voltage readback in the detection means, digital phase locking is carried out to judge alternating current and direct current input, but a plurality of links such as single chip microcomputer power supply, signal conditioning and analog-to-digital conversion are involved in the sampling process, so that current is complex, meanwhile, signals are easy to judge when input voltage is relatively pure, misjudgment is easy to occur when direct current components are relatively large, and meanwhile, abnormal problems in a large-range input working range are easy to occur due to differences caused by different phase locking algorithm levels.
In the prior art, the digital acquisition is carried out in an alternating current/direct current detection mode:
after the input voltage is reduced and impedance matched through the operational amplifier, the alternating-current and direct-current voltage input by high voltage is converted into an analog-to-digital converter and is converted into a digital signal, and then the digital signal is acquired by the data of the singlechip to obtain a digital voltage waveform, and the alternating-current and direct-current judgment and the alternating-current lock equality judgment are carried out.
The prior art has the following defects: the circuit is relatively complex, and the circuit of devices such as digital-to-analog conversion, a singlechip and the like is complex, and the cost is high. Because the related circuit is not isolated from the alternating current power grid, the single chip microcomputer is easy to influence when the input with poor quality such as large harmonic wave occurs at the power grid side. Meanwhile, the requirements on the aspects of data acquisition and processing algorithms and the like are higher.
In view of this, the present utility model has been made.
Disclosure of Invention
The utility model aims to provide an alternating current/direct current input detection device so as to solve the technical problems in the prior art.
The utility model aims at realizing the following technical scheme:
the AC/DC input detection device comprises an AC/DC input conditioning circuit, an AC phase-locking circuit, a phase-locking dead zone control circuit, an AC/DC signal screening circuit and an AC/DC signal output circuit which are sequentially connected and respectively connected with an auxiliary power supply circuit.
Compared with the prior art, the AC/DC input detection device provided by the utility model can judge and screen AC/DC signals, realizes functions of phase locking and dead zone control of the AC signals, and has the characteristics of simple circuit, low cost, high reliability and low misjudgment rate.
Drawings
Fig. 1 is a block diagram of an ac/dc input detection device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an AC/DC input conditioning circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of an AC phase lock circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a phase lock dead zone control circuit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of an AC/DC signal screening circuit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of an ac/dc signal output circuit according to an embodiment of the utility model.
Detailed Description
The technical solutions in the embodiments of the present utility model are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model; it will be apparent that the described embodiments are only some embodiments of the utility model, but not all embodiments, which do not constitute limitations of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
The terms that may be used herein will first be described as follows:
the term "and/or" is intended to mean that either or both may be implemented, e.g., X and/or Y are intended to include both the cases of "X" or "Y" and the cases of "X and Y".
The terms "comprises," "comprising," "includes," "including," "has," "having" or other similar referents are to be construed to cover a non-exclusive inclusion. For example: including a particular feature (e.g., a starting material, component, ingredient, carrier, formulation, material, dimension, part, means, mechanism, apparatus, step, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article of manufacture, etc.), should be construed as including not only a particular feature but also other features known in the art that are not explicitly recited.
The term "consisting of … …" is meant to exclude any technical feature element not explicitly listed. If such term is used in a claim, the term will cause the claim to be closed, such that it does not include technical features other than those specifically listed, except for conventional impurities associated therewith. If the term is intended to appear in only a clause of a claim, it is intended to limit only the elements explicitly recited in that clause, and the elements recited in other clauses are not excluded from the overall claim.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and the like should be construed broadly to include, for example: the connecting device can be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms herein above will be understood by those of ordinary skill in the art as the case may be.
The terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for ease of description and to simplify the description, and do not explicitly or implicitly indicate that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure.
What is not described in detail in the embodiments of the present utility model belongs to the prior art known to those skilled in the art. The specific conditions are not noted in the examples of the present utility model and are carried out according to the conditions conventional in the art or suggested by the manufacturer. The reagents or apparatus used in the examples of the present utility model were conventional products commercially available without the manufacturer's knowledge.
The AC/DC input detection device comprises an AC/DC input conditioning circuit, an AC phase-locking circuit, a phase-locking dead zone control circuit, an AC/DC signal screening circuit and an AC/DC signal output circuit which are sequentially connected and respectively connected with an auxiliary power supply circuit.
The voltage input end of the power supply is connected in series through a plurality of resistors R2, R3 and R4 to the output voltage Vout end, and is connected with two branches:
one path is connected with a first voltage stabilizing tube ZD1 through a first diode D1 and is connected with positive power supply VCC through a first resistor R1;
the other path is connected with a second voltage stabilizing tube ZD2 through a second diode D2 and is connected with a negative power supply VEE through a fifth resistor R5.
After the output voltage Vin of the ac/dc input conditioning circuit passes through two comparators, the output ends of the first output voltage Vout1 and the second output voltage Vout2 are respectively connected, where:
a comparator is connected with positive power VCC, a sixty-eighth resistor R68 and a sixty-ninth resistor R69;
the other comparator is connected to the negative supply VEE and the thirty-seventh resistor R37, the thirty-eighth resistor R38.
The first input after phase locking (Vin 1 is connected with the twenty-eighth capacitor C28 and the eighth NAND gate U8 after passing through the forty-fifth resistor R45;
the second input voltage Vin2 after phase locking is connected to the twenty-ninth capacitor C29 and the eighth nand gate U8 after passing through the forty-sixth resistor R46.
The AC/DC screening circuit inputs a first input voltage Vin1 and a second input voltage Vin2, the first hundred-fourteen capacitors C114 and the first hundred-nineteen capacitors C119 are respectively connected, and an output voltage Vout end is connected with a reference point through a second hundred-twenty-two resistor R222;
the ac/dc screening circuit inputs a first input voltage Vin1 and a second input voltage Vin2, and is connected to the seventh pipe Q7 and the ninth pipe Q9, respectively.
The input voltage Vin end is connected with the eleventh NAND gate U11 through a twenty-ninth diode D29 and a twenty-fifth operational amplifier U25, and the twenty-fifth operational amplifier U25 is connected with a second hundred-eighteen resistor R218 and a second hundred-nineteen resistor R219.
Specifically, the device comprises an alternating current/direct current input conditioning circuit, an alternating current phase-locked circuit, a phase-locked dead zone control circuit, an alternating current/direct current signal screening circuit and an alternating current/direct current signal output circuit which are sequentially connected and respectively connected with an auxiliary power supply circuit;
the AC/DC input conditioning circuit is used for converting an AC sinusoidal signal into a square wave signal with the same phase or converting a DC signal into a level signal with the same phase by modulating the voltage of the output end of the power supply, and is used for converting a high-voltage signal into a low-voltage signal capable of performing signal processing;
the alternating current phase-locked circuit filters and locks alternating current-direct current phase signals which are modulated by the previous stage, so that phase correctness under the condition of poor power grid quality is ensured;
the phase-locking dead zone control circuit adds a square wave signal formed by a front-stage phase lock into dead zone time and is used for driving a low-frequency bridge arm of a bidirectional energy flow power supply to prevent the situation that the low-frequency bridge arm is directly connected to cause damage, and when the input is direct-current voltage, the level of a phase-locking signal is not changed;
the alternating current/direct current signal screening circuit screens alternating current signals into potential signals lower than an alternating current/direct current input judgment threshold value according to different input signals, and screens direct current signals into potential signals higher than the alternating current/direct current input judgment threshold value;
the alternating current/direct current signal output circuit compares the screened alternating current/direct current input signal with a threshold value, and finally outputs 0V or 5V as the criterion of alternating current/direct current input.
The AC/DC input conditioning circuit comprises:
the voltage input by the power supply is subjected to series current limiting through a plurality of resistors R2, R3 and R4, so that the power consumption of the resistors during high-voltage input is reduced;
when the input voltage is positive voltage, the voltage is stabilized by the first voltage stabilizing tube ZD1 after passing through the first diode D1, so as to achieve the purpose of reducing the voltage, and meanwhile, the input voltage is connected with the positive power supply VCC through the first resistor R1 to clamp the highest positive voltage;
when the input voltage is negative voltage, the voltage is stabilized by the second voltage stabilizing tube ZD2 after passing through the second diode D2, so as to achieve the purpose of reducing the voltage, and meanwhile, the voltage is connected with the negative power supply VEE through the fifth resistor R5 to clamp the lowest negative voltage;
when the input is alternating current, the waveform of the output voltage Vout is a square wave signal with the same phase as the input alternating current, wherein the maximum value of the positive phase is the voltage stabilizing value of the first voltage stabilizing tube ZD1, the minimum value of the negative phase is the voltage stabilizing value of the second voltage stabilizing tube ZD 2;
when the input is a positive direct current signal, the output voltage Vout outputs a positive level with the amplitude being the voltage stabilizing value of the first voltage stabilizing tube ZD 1;
when the input is negative-phase direct current signals, the output voltage Vout outputs negative-phase level with the amplitude being the voltage stabilizing value of the second voltage stabilizing tube ZD 2.
The AC phase lock circuit includes:
the output voltage Vin of the AC/DC input conditioning circuit is compared with a positive phase signal after being divided by a positive power supply VCC and a reference point through a comparator, and a first output voltage Vout1 with the same phase as the phase of the AC input signal is generated;
the output voltage Vin of the AC/DC input conditioning circuit is compared with the negative power supply VEE and the negative phase signal after the reference point voltage division by a comparator to generate a second output voltage Vout2 with the opposite phase to the phase of the AC input signal;
the voltage division signal amplitude of the positive power supply VCC through a sixty-eighth resistor R68 and a sixty-ninth resistor R69 is lower than the voltage stabilizing value of a first voltage stabilizing tube ZD1 in the AC/DC input conditioning circuit; the voltage division signal amplitude of the negative power supply VEE through the thirty-seventh resistor R37 and the thirty-eighth resistor R38 is higher than the voltage stabilizing value of the second voltage stabilizing tube ZD2 in the AC/DC input conditioning circuit, and the voltage stabilizing value is used for filtering the oscillation problem of the AC zero crossing point.
The phase-locked dead zone control circuit includes:
the twenty-eighth capacitor C28 is charged after the first input voltage Vin1 subjected to phase locking passes through the forty-fifth resistor R45, when the voltage reaches the inversion threshold value from the low level to the high level of the eighth NAND gate U8, vout1 outputs the high level, and when the input voltage reaches the inversion threshold value from the high level to the low level of U8, vout1 outputs the low level;
the twenty-ninth capacitor C29 is charged after the second input voltage Vin2 subjected to phase locking passes through the forty-sixth resistor R46, when the voltage reaches the inversion threshold value from the low level to the high level of the eighth NAND gate U8, the Vout2 outputs the high level, and when the input voltage reaches the inversion threshold value from the high level to the low level of the eighth NAND gate U8, the Vout2 outputs the low level;
the time for reaching the conversion threshold value in the high-low level conversion process is dead time, and the control without dead time is realized by adjusting the specifications of the forty-fifth resistor R45 and the twenty-eighth capacitor C28 and the forty-sixth resistor R46 and the twenty-ninth capacitor C29;
meanwhile, the output end of the eighth NAND gate U8 is led into the input end and is used for realizing level mutual exclusion between the first output voltage Vout1 and the second output voltage Vout2 when a single-side circuit fails, so that the phenomenon of straight-through short-circuit frying of a grid-connected low-frequency bridge arm is prevented.
The alternating current-direct current signal screening circuit comprises:
when the input is alternating current, the alternating current-direct current screening circuit inputs a first input voltage Vin1 and a second input voltage Vin2 which are TTL level signals with the same and opposite phases as the alternating current input, when the level of the first input voltage Vin1 or the second input voltage Vin2 is changed from low to high, positive voltages are respectively generated through a first hundred-fourteen capacitor C114 and a first hundred-nineteenth capacitor C119, so that the voltage of an output voltage Vout is connected with a reference point through a second hundred-twenty-second resistor R222, the first hundred-thirteen capacitor C113 is discharged, and the maximum value of the output voltage Vout in the alternating current input frequency range is regulated by regulating the capacitance value of the first hundred-thirteen capacitor C113 and the resistance value of the second hundred-twenty-second resistor R222;
when the input is direct current, the levels of the first input voltage Vin1 and the second input voltage Vin2 input by the alternating current-direct current screening circuit are not changed, so that the seventh tube Q7 and the ninth tube Q9 are not conducted, and the voltage of the output voltage Vout is constantly output to be 4V;
thereby realizing the screening of alternating current and direct current signals.
The AC/DC signal output circuit comprises:
when the output is alternating current, the resistance values of the second hundred-eighteen resistor R218 and the second hundred-nineteen resistor R219 are selected to enable the input voltage of the inverting input end of the twenty-fifth operational amplifier U25 to be larger than the input voltage Vin signal output by the alternating current-direct current signal screening circuit, and the output end of the twenty-fifth operational amplifier U25 is enabled to be output to be in a low level;
when the output is direct current, the input voltage Vin is 4V and is larger than the input voltage of the inverting input end of the twenty-fifth operational amplifier U25, so that the output end of the twenty-fifth operational amplifier U25 is output to be high level, and the input alternating current-direct current judgment is realized;
the eleventh NAND gate U11 is used for converting high-low level signals of the power supply voltage of the operational amplifier into TTL level, so that the subsequent circuit is convenient to use;
the twenty-ninth diode D29 is used for preventing the AC/DC input switching failure of the power supply during operation and improving the reliability of the circuit.
In summary, the ac/dc input detection device according to the embodiment of the present utility model can accurately determine the ac voltage, and output the TTL level for subsequent control and determination; the analog circuit is used for judging the related signals, so that the reliability is improved; the circuit cost is reduced, and the development difficulty of using a digital filtering phase-locked algorithm is reduced.
In order to more clearly demonstrate the technical scheme and the technical effects provided by the utility model, the following detailed description of the embodiments of the utility model is given by way of specific examples.
Example 1
As shown in fig. 1:
the AC/DC input detection device comprises an AC/DC input conditioning circuit, an AC phase-locked circuit, a phase-locked dead zone control circuit, an AC/DC signal screening circuit, an AC/DC signal logic output circuit, an auxiliary power supply circuit, wherein:
the AC/DC input conditioning circuit converts an AC sinusoidal signal into a square wave signal with the same phase or converts a DC signal into a level signal with the same phase by modulating the voltage of the output end of the power supply. The main function of the part is to convert the high-voltage signal into a low-voltage signal which can be processed;
the alternating current phase-locked circuit filters and locks alternating current-direct current phase signals which are modulated by the previous stage, so that phase correctness under the condition of poor power grid quality is ensured;
the phase-locking dead zone control circuit adds a square wave signal formed by a front-stage phase lock into dead zone time and is used for driving a low-frequency bridge arm of a bidirectional energy flow power supply to prevent the situation that the low-frequency bridge arm is directly connected to cause damage, and when the input is direct-current voltage, the level of a phase-locking signal is not changed;
an AC/DC signal screening circuit for screening AC signals to potential signals lower than an AC/DC input judgment threshold value according to different input signals and screening DC signals to potential signals higher than the AC/DC input judgment threshold value;
and the alternating current/direct current signal output circuit compares the screened alternating current/direct current input signal with a threshold value and finally outputs TTL level as criterion of alternating current/direct current input.
The ac/dc input conditioning circuit specifically realizes that as shown in fig. 2, the voltage input by the power supply is limited by R2, R3 and R4, the power consumption of the resistor is reduced by adopting a plurality of resistors connected in series during high-voltage input, when the input voltage is positive voltage, the voltage is stabilized by ZD1 after passing through a diode D1, the purpose of reducing the voltage is achieved, meanwhile, the highest positive voltage is clamped by connecting with a positive power VCC through R1, when the input voltage is negative voltage, the purpose of reducing the voltage is achieved by stabilizing the voltage by ZD2 after passing through a diode D2, meanwhile, the lowest negative voltage is clamped by connecting with a negative power VEE through R5, when the input is alternating current, the Vout waveform is positive phase maximum value ZD1 voltage stabilizing value, the negative phase minimum value is ZD2 voltage stabilizing value, and the phase is the same as the square wave signal of the input alternating current. When the input is a positive direct current signal, vout outputs a positive level with amplitude being ZD1 voltage stabilizing value; when the input is negative phase direct current signal, vout outputs negative phase level with amplitude of ZD2 voltage stabilizing value. Thereby realizing the purpose of signal conditioning.
As shown in fig. 3, the ac phase-locked circuit is specifically implemented, and the output voltage Vin of the ac/dc input conditioning circuit is compared with the positive phase signal obtained by dividing VCC and the reference point by the comparator, and the negative phase signal obtained by dividing VEE and the reference point by the comparator, so as to generate Vout1 with the same phase as the ac input signal and Vout2 with the opposite phase to the ac input signal. The voltage-dividing signal amplitude of VCC through R68 and R69 should be lower than the voltage-stabilizing value of ZD1 in the AC/DC input conditioning circuit, and the voltage-dividing signal amplitude of VEE through R37 and R38 should be higher than the voltage-stabilizing value of ZD2 in the AC/DC input conditioning circuit, so as to filter the oscillation problem of AC zero crossing point.
As shown in fig. 4, the phase-locked dead zone control circuit specifically charges C28 after a phase-locked signal passes through R45, when the voltage reaches a U8 low level to high level inversion threshold, vout1 outputs a high level, and when the input voltage reaches a U8 high level to low level inversion threshold, vout1 outputs a low level. The time for reaching the conversion threshold value in the high-low level conversion process is dead time, and the control without dead time can be realized by adjusting the specifications of R45, C28, R46 and C29. The 6-pin lead-in 2 pin of the U8 and the 3-pin lead-in 4 pin of the U8 are used as faults of a unilateral circuit, so that the level mutual exclusion of Vout1 and Vout2 is realized, and the phenomenon of direct short-circuit frying of a grid-connected low-frequency bridge arm is prevented.
As shown in FIG. 5, when the input is AC, the AC/DC signal screening circuit inputs Vin1 and Vin2 as TTL level signals with the same and opposite phases as the AC input, when Vin1 or Vin2 level is converted from low to high, positive voltage is generated through a capacitor C114 and a capacitor C119 respectively so that the Vout voltage is connected with a reference point through a capacitor R222, C113 is discharged, and the maximum value of Vout in the AC input frequency range can be regulated by regulating the capacitance value and the resistance value of the C113; when the input is direct current, the levels of the input Vin1 and Vin2 of the alternating current-direct current screening circuit are not changed, so that the Q7 and the Q9 are not conducted, and therefore the voltage of Vout is constantly output to be 4V. Thereby realizing the screening of alternating current and direct current signals.
As shown in FIG. 6, when the output is AC, the resistance of R218 and R219 is selected to make the input voltage of 6 pins of U25 greater than Vin signal output by the AC/DC signal screening circuit, so that the output of 7 pins of the operational amplifier U25 is low level. When the output is direct current, vin is 4V and is larger than the input voltage of 6 pins of U25, so that the output of 7 pins of the operational amplifier U25 is high level, and the input alternating current/direct current judgment is realized. U11 is used for converting high-low level signals of the operational amplifier power supply voltage into TTL level, and is convenient for the subsequent circuit to use. D29 is used for preventing the AC/DC input switching failure of the power supply during operation and improving the reliability of the circuit.
Fig. 6 is a schematic diagram of an ac/dc signal output circuit.
According to the AC/DC input detection device, the detection of the AC/DC input signal is realized by using a simple analog circuit, so that the detection precision and speed are improved; the detection of large-range input and low-quality power supply input can be realized by changing the circuit parameters of each part, so that the adaptability is improved; the drive signal for driving the bidirectional energy flow power supply can be output while the AC/DC input judgment is carried out, so that the cost is reduced. The universality is improved.
In a specific implementation, all parts can be replaced by the same or similar scheme, for example, an alternating current/direct current input conditioning circuit can also adopt an integrated comparator to condition the input voltage.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims. The information disclosed in the background section herein is only for enhancement of understanding of the general background of the utility model and is not to be taken as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
Claims (6)
1. The alternating current/direct current input detection device is characterized by comprising an alternating current/direct current input conditioning circuit, an alternating current phase-locked circuit, a phase-locked dead zone control circuit, an alternating current/direct current signal screening circuit and an alternating current/direct current signal output circuit which are sequentially connected and respectively connected with an auxiliary power supply circuit.
2. The ac/dc input detection device according to claim 1, wherein the ac/dc input conditioning circuit comprises:
the voltage input end of the power supply is connected in series through a plurality of resistors (R2, R3 and R4) to the output voltage (Vout) end, and is connected with two branches:
one path is connected with a first voltage stabilizing tube (ZD 1) through a first diode (D1) and is connected with positive power supply (VCC) through a first resistor (R1);
the other path is connected with a second voltage stabilizing tube (ZD 2) through a second diode (D2), and is connected with negative power supply (VEE) through a fifth resistor (R5).
3. The ac/dc input detection apparatus according to claim 2, wherein the ac phase lock circuit includes:
after the output voltage (Vin) of the alternating current-direct current input conditioning circuit passes through two comparators, the output ends of the first output voltage (Vout 1) and the second output voltage (Vout 2) are respectively connected, wherein:
a comparator is connected with positive power supply (VCC) and a sixty-eighth resistor (R68) and a sixty-ninth resistor (R69);
the other comparator is connected with a negative power supply (VEE) and a thirty-seventh resistor (R37) and a thirty-eighth resistor (R38).
4. An ac/dc input detection apparatus as claimed in claim 3, wherein the phase lock dead zone control circuit comprises:
the first input voltage (Vin 1) subjected to phase locking is connected with an eighth capacitor (C28) and an eighth NAND gate (U8) after passing through a forty-fifth resistor (R45);
the second input voltage (Vin 2) after phase locking is connected with a twenty-ninth capacitor (C29) and an eighth NAND gate (U8) after passing through a forty-sixth resistor (R46).
5. The ac/dc input detection apparatus of claim 4, wherein said ac/dc signal screening circuit comprises:
the AC/DC screening circuit inputs a first input voltage (Vin 1) and a second input voltage (Vin 2) which are respectively connected with a first hundred-fourteen capacitor (C114) and a first hundred-nineteen capacitor (C119), and an output voltage (Vout) end is connected with a reference point through a second hundred twenty-two resistor (R222);
the first input voltage (Vin 1) and the second input voltage (Vin 2) are input to the ac/dc screening circuit, and are connected to a seventh pipe (Q7) and a ninth pipe (Q9), respectively.
6. The ac/dc input detection apparatus as claimed in claim 5, wherein the ac/dc signal output circuit comprises:
the input voltage (Vin) end is connected with an eleventh NAND gate (U11) through a twenty-ninth diode (D29) and a twenty-fifth operational amplifier (U25), and the twenty-fifth operational amplifier (U25) is connected with a second hundred-eighteen resistor (R218) and a second hundred-nineteen resistor (R219).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310012543 | 2023-01-05 | ||
| CN2023200230686 | 2023-01-05 | ||
| CN202320023068 | 2023-01-05 | ||
| CN2023100125434 | 2023-01-05 |
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| CN219831333U true CN219831333U (en) | 2023-10-13 |
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| CN202310220600.8A Pending CN116400254A (en) | 2023-01-05 | 2023-03-09 | AC/DC input detection device |
| CN202320430384.5U Active CN219831333U (en) | 2023-01-05 | 2023-03-09 | AC/DC input detection device |
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