CN100485405C - Circuit for detecting voltage and frequency of input power supply - Google Patents
Circuit for detecting voltage and frequency of input power supply Download PDFInfo
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- CN100485405C CN100485405C CNB2004100722413A CN200410072241A CN100485405C CN 100485405 C CN100485405 C CN 100485405C CN B2004100722413 A CNB2004100722413 A CN B2004100722413A CN 200410072241 A CN200410072241 A CN 200410072241A CN 100485405 C CN100485405 C CN 100485405C
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Abstract
The invention relates to a voltage and frequency testing circuit of an input power, which comprises a converter deck the input power, a current limiting resistance on the one time end of the converter used to limit the input current, a bridge type diode rectifying circuit on the two time end of the converter used to do all wave rectifying to the reduced voltage, a power frequency testing circuit part used to output the inputted power frequency signal based on the output of the bridge type diode, a microcontroller used to quote the voltage and the frequency of the inputted power by the value of power frequency testing circuit part and the voltage testing circuit part; the power frequency testing circuit part comprises: a first voltage-allocation device to allocate the reduced voltage from the two time end of the converter, a guiding controller to guiding control the output of the first voltage-allocation device.
Description
Technical field
The present invention relates to be used to detect the detection loop of input power source voltage and frequency.
Background technology
As shown in Figure 1, import in the prior art in power source voltage and the frequency detecting loop, 1 end of transformer (10) is connected with power supply, and 2 ends of transformer (10) are connected with bridge diode rectification circuit (20).Above-mentioned bridge diode rectification circuit (20) is connected to the positive pole of the 1st diode (D1), and the negative pole of the 1st diode (D1) then is connected to the 1st resistance (R1).In addition, the node of the 1st diode (D1) and the 1st resistance (R1) is connected to the 1st electric capacity (C1), and above-mentioned the 1st electric capacity (C1) is commutation capacitor.
Above-mentioned the 1st resistance (R1) is connected to the 3rd resistance (R3), and the node of the 1st resistance (R1) and the 3rd resistance (R3) is connected to and is connected to+positive pole of the 2nd diode (D2) of 5V power supply.And the node of above-mentioned the 1st resistance (R1) and the 3rd resistance (R3) is connected to the 2nd resistance (R2).Above-mentioned the 3rd resistance (R3) is connected to microcontroller (30) by voltage output end (B), and the node of above-mentioned the 3rd resistance (R3) and voltage output end (B) then is connected to the 2nd electric capacity (C2).
Simultaneously, bridge diode rectification circuit (20) is connected to the 5th resistance (R5), and the node between bridge diode rectification circuit (20) and the 5th resistance (R5) then is connected with the 4th resistance (R4).Above-mentioned the 5th resistance (R5) is connected to the base terminal of the 1st transistor (Q1), and on the node between above-mentioned the 5th resistance (R5) and the 1st transistor (Q1) base terminal, respectively is connected with the 6th resistance (R6) and the 3rd electric capacity (C3).The collector terminal of above-mentioned the 1st transistor (Q1) is connected with and receives+the 7th resistance (R7) of 5V voltage, and the node between above-mentioned the 7th resistance (R7) and the 1st transistor (Q1) collector terminal then is connected with frequency output terminal (A).In addition, the grounded emitter of above-mentioned the 1st transistor (Q1).
The following describes as above the input power source voltage of the prior art of structure and the operation steps in frequency detecting loop.
At first,, as shown in Figure 1, connect AC power, and be input to 1 end of transformer (10) by power end in order to detect the input power source voltage.Simultaneously, the power supply that 2 end outputs by above-mentioned transformer (10) obtain reducing pressure, the power supply of above-mentioned output be by bridge diode rectification circuit (20) and as the 1st electric capacity (C1) of commutation capacitor, and obtain set direct current (DC) voltage.Above-mentioned DC voltage will transmit by the 1st resistance (R1), the 2nd resistance (R2), the 3rd resistance (R3), the 2nd electric capacity (C2), and to power output terminal (B) output correspondent voltage.Above-mentioned power output terminal (B) is connected to microcontroller (30), thereby above-mentioned microcontroller (30) detects the magnitude of voltage of input.
Simultaneously, carry out following operation for the frequency that detects the input power supply.
At first, connect AC power, and be input to 1 end of transformer (10) by power end.Simultaneously, 2 ends by above-mentioned transformer (10) are exported the power supply that obtains reducing pressure, the power supply of above-mentioned output is sent to the 5th resistance (R5) by bridge diode rectification circuit (20) and the 4th resistance (R4), and is input to the base terminal of the 1st transistor (Q1) by the 6th resistance (R6) and the 3rd electric capacity (C3).Thus, the 1st transistor (Q1) conducting (switching) is also by frequency output terminal (A) output correspondent frequency.
The pcb board structure of transformer is installed in input power source voltage of the prior art and the frequency detecting loop as shown in Figure 2.Be provided with a plurality of circuit elements in this loop.Be wound with a lot of iron cores in the use therein transformer, cause its volume greatly and very heavy.
Therefore, in the prior art, the weight and the volume of transformer that is used to reduce input supply voltage is bigger, causes the space proportion that occupies in the loop relatively large.Simultaneously, because the price height of above-mentioned transformer has improved its manufacturing cost.
Summary of the invention
In order to overcome the above-mentioned shortcoming that prior art exists, the invention provides a kind of input power source voltage and frequency detecting loop, so that its modular construction that constitutes the loop is simple, and make the relative low price in its loop.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of input power source voltage and frequency detecting loop, it comprises: transformer, reduce pressure to the input power supply; The electric current limiting resistance is arranged at end for 1 time of above-mentioned transformer, is used to limit input current; The bridge diode rectification circuit is arranged at end for 2 times of above-mentioned transformer, and the voltage of decompression is carried out full-wave rectification; Supply frequency detects loop portion, based on the output of above-mentioned bridge diode, and then the frequency signal of output input power supply; Voltage detecting loop portion, based on the output of above-mentioned bridge diode, and then output input power source voltage signal; Microcontroller, from the value of above-mentioned supply frequency detection loop portion and the input of voltage detecting loop portion, judge input power source voltage and frequency, wherein, this supply frequency detects loop portion and includes: the 1st bleeder mechanism, and the decompression voltage that 2 ends of transformer are exported distributes; The conducting control device carries out conducting control to the output of above-mentioned the 1st bleeder mechanism.
Aforesaid input power source voltage and frequency detecting loop, wherein voltage detecting loop portion includes: fairing, the decompression power supply that 2 ends of transformer are exported carries out rectification; The 2nd bleeder mechanism distributes the DC voltage of above-mentioned fairing.
Aforesaid input power source voltage and frequency detecting loop, wherein the loop portion except the transformer constitutes by printed circuit-board assembly, the top of above-mentioned printed circuit board (PCB) is provided with transformer, and constitutes a module, simultaneously above-mentioned module is carried out molded processing.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the input power source voltage and the frequency detecting loop of prior art.
Fig. 2 is the pcb board structure that transformer is installed in the input power source voltage of prior art and the frequency detecting loop.
Fig. 3 is that the present invention imports power source voltage and frequency detecting loop.
Fig. 4 is the voltage characteristic figure that the present invention imports the out-put supply state of power source voltage and the detection of frequency detecting loop.
Fig. 5 is the internal module constitutional diagram that the present invention imports power source voltage and frequency detecting loop.
Fig. 6 is the external module constitutional diagram that the present invention imports power source voltage and frequency detecting loop.
The number in the figure explanation:
100: transformer 200: bridge diode (bridge diode)
300: microcontroller R1 '～R9 ': resistance
Q1: transistor D1 ', D2 ': diode
C1 '～C3 ': electric capacity
Embodiment
The annexation of each control element in the loop at first is described, shown in Fig. 3,4,1 end of transformer (100) connects power end, wherein, above-mentioned transformer among the present invention uses the coil of 1/3 size of transformer in the prior art, thereby its volume, weight etc. will greatly reduce.
In addition, be connected with the 1st resistance (R1 ') between the terminal 3 of power end and transformer (100) 1 time end, play the effect of restriction electric current.2 times of transformer (100) end is connected with bridge diode rectification circuit (200), and above-mentioned bridge diode rectification circuit (200) is connected to the positive pole of the 1st diode (D1 '), and the negative pole of above-mentioned the 1st diode (D1 ') then is connected to the 2nd resistance (R2 ').Simultaneously, the node of above-mentioned the 1st diode (D1 ') and the 2nd resistance (R2 ') is connected with the 1st electric capacity (C1 '), and above-mentioned the 1st electric capacity (C1 ') be commutation capacitor.
Above-mentioned the 2nd resistance (R2 ') is connected to the 4th resistance (R4 '), and the node of the 2nd resistance (R2 ') and the 4th resistance (R4 ') is connected to and is connected to+positive pole of the 2nd diode of 5V power supply (D2 ').And the node of above-mentioned the 2nd resistance (R2 ') and the 4th resistance (R4 ') is connected with the 3rd resistance (R3 ').Above-mentioned the 4th resistance (R4 ') is connected to microcontroller (300) by input voltage detection terminal (B '), and the node of above-mentioned the 4th resistance (R4 ') and input voltage detection terminal (B ') is connected with the 3rd electric capacity (C3 ').
Simultaneously, bridge diode rectification circuit (200) is connected to the 7th resistance (R7 '), and the node between above-mentioned bridge diode rectification circuit (200) and the 7th resistance (R7 ') is connected with the 6th resistance (R6 ').Above-mentioned the 7th resistance (R7 ') is connected to the base terminal of the 1st transistor (Q1 '), on the node between above-mentioned the 7th resistance (R7 ') and the 1st transistor (the Q1 ') base terminal, respectively is connected with the 8th resistance (R8 ') and the 2nd electric capacity (C2 ').The collector terminal of above-mentioned the 1st transistor (Q1 ') is connected with and receives+the 9th resistance of 5V power supply (R9 '), and the node between above-mentioned the 9th resistance (R9 ') and the 1st transistor (the Q1 ') collector terminal is connected with frequency output terminal that joins with microcontroller (300) (A ').In addition, the emitter terminal ground connection of above-mentioned the 1st transistor (Q1 ').
The following describes as above the input power source voltage of the present invention of structure and the operation steps in frequency detecting loop.
At first,, as shown in Figure 3, receive AC power by power end in order to detect the input power source voltage, above-mentioned AC power by electric current restriction with the 1st resistance (R1 '), thereby the electric current of the input current of limiting AC power supply.
The input current that the above-mentioned magnitude of current is restricted outputs to 2 ends of transformer (100) by 1 end of transformer (100).Wherein, above-mentioned transformer (100) is to separating with power supply by 2 end outputs by the input current of 1 end input and reducing pressure.Simultaneously, the decompression voltage by 2 ends of transformer (100) are exported will carry out full-wave rectification by bridge diode rectification circuit (200).
Decompression voltage by above-mentioned bridge diode rectification circuit (200) is through the 1st diode (D1 '), and carries out rectification by the 1st electric capacity (C1 '), thereby is transformed to set direct current (DC) voltage.Then, carry out dividing potential drop by the 2nd resistance (R2 ') and the 3rd resistance (R3 ').The above-mentioned voltage that passes through the 4th resistance (R4 ') and the 3rd electric capacity (C3 ') will output to input voltage detection terminal (B ').
Above-mentioned input voltage detection terminal (B ') is connected to the arbitrary port that constitutes in the microcontroller (300), and above-mentioned microcontroller (300) is the magnitude of voltage by transmitting in the input voltage detection terminal (B ') then, and the input power supply is detected.
The input power supply of input in 1 end of transformer as shown in Figure 4 (100), and the output voltage that is transformed to DC voltage by transformer (100).Above-mentioned output voltage is sent in the above-mentioned microcontroller (300) by input voltage detection terminal (B ').Thus, microcontroller (300) can identify the pairing input voltage value of above-mentioned output voltage values.As shown in the figure, export the output voltage that is transformed to DC voltage, be directly proportional with the input voltage of 1 end receiving transformer (100) by 2 ends of transformer (100).
Simultaneously, carry out following operation for the frequency that detects the input power supply.
At first, receive AC power by power end, above-mentioned AC power by electric current restriction with the 1st resistance (R1 '), thereby the electric current of the input current that contains in the limiting AC power supply.
The input current that the above-mentioned magnitude of current is restricted outputs to 2 ends of transformer (100) by 1 end of transformer (100).Wherein, above-mentioned transformer (100) is to separating with power supply by 2 end outputs by the input current of 1 end input and reducing pressure.Simultaneously, the decompression voltage by 2 ends of transformer (100) are exported will carry out full-wave rectification by bridge diode rectification circuit (200).
Obtain the voltage of rectification by above-mentioned bridge diode rectification circuit (200), will carry out dividing potential drop by the 7th resistance (R7 ') and the 8th resistance (R8 ').The voltage of above-mentioned distribution is through the 2nd electric capacity (C2 '), is input to the base terminal of the 1st transistor (Q1 ').The signal that above-mentioned the 1st transistor (Q1 ') produced by this moment carries out conducting, and to frequency output terminal (A ') output signal.
Said frequencies lead-out terminal (A ') is connected to the arbitrary port of microcontroller (300).Thus, above-mentioned microcontroller (300) detects the frequency of input power supply according to the signal that transmits by said frequencies lead-out terminal (A ').
Shown in Fig. 5,6, be provided with transformer (100) in input power source voltage and the frequency detecting loop, the loop portion except that above-mentioned transformer (100) then is installed on the bottom of printed circuit-board assembly.On the as above top of the printed circuit-board assembly of structure, above-mentioned transformer (100) will be installed, and with mould shell (plastic case) carry out molded, thereby form as shown in Figure 6 circuit module.Wherein, printed circuit board (PCB) and transformer are outside to carry out moldedly by surrounding, and makes its effect of playing insulation, thereby solves the problem of insulation aspect in the loop.
Thus, the structure in loop is carried out molded processing by a subassembly (package), and it is simplified the structure, and can carry out stabilized driving owing to its insulation function, thereby improves reliability of products.
In addition, the transformer that install on the top of above-mentioned printed circuit-board assembly, more less relatively than the volume of in the past transformer, simultaneously by reducing the coil number that twines on the iron core, can corresponding minimizing manufacturing cost.
As mentioned above, in the present invention, the front end of transformer is equipped with electric current brownout resistance, be used to limit the magnitude of current of input current, and the transformer of 1/3 size is compared in use with conventional art, carry out molded processing simultaneously, make its loop have insulating effect, and with this as the basic technological thought of the present invention.
For this reason, in the present invention, 1 end of transformer is provided with the resistance that is used to control input current.In addition, in the present invention, the input voltage detection terminal is connected to any terminal of microcontroller, makes its voltage that passes through 2 times of above-mentioned transformer end outputs, obtains decompression and is transformed to direct supply and exports.Simultaneously, in the present invention, frequency output terminal is connected to any terminal of microcontroller, makes its voltage that passes through 2 end outputs of above-mentioned transformer, and the 1st transistor carries out conducting operation and output correspondent frequency.
The scope that claim of the present invention is asked for protection is not limited to aforesaid embodiment, but is limited by the record in claims.In the scope that does not exceed claim of the present invention, the professional and technical personnel can carry out various deformation and modification to it.
General plotting of the present invention is:
A kind of input power source voltage and frequency detecting loop, it comprises: transformer, reduce pressure to the input power supply; The electric current limiting resistance is arranged at end for 1 time of above-mentioned transformer, is used to limit input current; The bridge diode rectification circuit is arranged at end for 2 times of above-mentioned transformer, and the voltage of decompression is carried out full-wave rectification; Supply frequency detects loop portion, based on the output of above-mentioned bridge diode, and then the frequency signal of output input power supply; Voltage detecting loop portion, based on the output of above-mentioned bridge diode, and then output input power source voltage signal; Microcontroller, from the value of above-mentioned supply frequency detection loop portion and the input of voltage detecting loop portion, judge input power source voltage and frequency, wherein, above-mentioned supply frequency detects loop portion and includes: the 1st bleeder mechanism, and the decompression voltage that 2 ends of transformer are exported distributes; The conducting control device carries out conducting control to the output of above-mentioned the 1st bleeder mechanism.
And above-mentioned voltage detecting loop portion includes: fairing, and the decompression power supply that 2 ends of transformer are exported carries out rectification; The 2nd bleeder mechanism distributes the DC voltage of above-mentioned fairing.
In addition, the loop portion except the above-mentioned transformer constitutes by printed circuit-board assembly, and the top of above-mentioned printed circuit board (PCB) is provided with transformer, and constitutes a module, simultaneously above-mentioned module is carried out molded processing.
The voltage of the input power among the present invention and frequency detecting loop have following effect: be provided with frequency output detections terminal and input power detection terminal among the present invention, thereby can voltage and the frequency of input power be detected. In addition, in the present invention, the front end of transformer is provided with current limit resistance, thereby on the loop, can be provided with small-sized transformer, but the transformer of constituent ratio transformer 1/3 size in the past thus, its result can reduce the coil number that twines on the transformer among the present invention, thereby reduces the parts expense. Simultaneously, in the present invention, the parts that consist of on the voltage of input power and the frequency detecting loop by molded and integrated setting, thereby simplify the structure it.
Claims (3)
1, a kind of input power source voltage and frequency detecting loop, it comprises:
Transformer reduces pressure to the input power supply;
The electric current limiting resistance is arranged at end for 1 time of above-mentioned transformer, is used to limit input current;
The bridge diode rectification circuit is arranged at end for 2 times of above-mentioned transformer, and the voltage of decompression is carried out full-wave rectification;
Supply frequency detects loop portion, based on the output of above-mentioned bridge diode, and then the frequency signal of output input power supply;
Voltage detecting loop portion, based on the output of above-mentioned bridge diode, and then output input power source voltage signal;
Microcontroller from the value of above-mentioned supply frequency detection loop portion and the input of voltage detecting loop portion, is judged input power source voltage and frequency, it is characterized in that:
Above-mentioned supply frequency detects loop portion and includes:
The 1st bleeder mechanism, the decompression voltage that 2 ends of transformer (100) are exported distributes;
The conducting control device carries out conducting control to the output of above-mentioned the 1st bleeder mechanism.
2, input power source voltage according to claim 1 and frequency detecting loop is characterized in that:
Above-mentioned voltage detecting loop portion includes:
Fairing, the decompression power supply that 2 ends of transformer (100) are exported carries out rectification;
The 2nd bleeder mechanism distributes the DC voltage of above-mentioned fairing.
3, input power source voltage according to claim 1 and frequency detecting loop, it is characterized in that: the loop portion except the above-mentioned transformer (100) constitutes by printed circuit-board assembly, the top of above-mentioned printed circuit board (PCB) is provided with transformer (100), and constitute a module, simultaneously above-mentioned module is carried out molded processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100722413A CN100485405C (en) | 2004-09-29 | 2004-09-29 | Circuit for detecting voltage and frequency of input power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100722413A CN100485405C (en) | 2004-09-29 | 2004-09-29 | Circuit for detecting voltage and frequency of input power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1755386A CN1755386A (en) | 2006-04-05 |
| CN100485405C true CN100485405C (en) | 2009-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100722413A Expired - Fee Related CN100485405C (en) | 2004-09-29 | 2004-09-29 | Circuit for detecting voltage and frequency of input power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN100485405C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162242B (en) * | 2006-12-29 | 2010-05-12 | 长春工程学院 | Method for testing direct current by quadrature transformer |
| CN101201365B (en) * | 2007-07-13 | 2010-06-02 | 北京工业大学 | System and method for measuring and analyzing voltage frequency |
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2004
- 2004-09-29 CN CNB2004100722413A patent/CN100485405C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1755386A (en) | 2006-04-05 |
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Granted publication date: 20090506 Termination date: 20110929 |