CN203572864U - Detection circuit for detecting output current and voltage - Google Patents
Detection circuit for detecting output current and voltage Download PDFInfo
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- CN203572864U CN203572864U CN201320512513.1U CN201320512513U CN203572864U CN 203572864 U CN203572864 U CN 203572864U CN 201320512513 U CN201320512513 U CN 201320512513U CN 203572864 U CN203572864 U CN 203572864U
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Abstract
The utility model provides a detection circuit for detecting output current and voltage, and the detection circuit is used for detecting the current and voltage which are transmitted to a load. The detection circuit comprises a current-sampling resistor, a three-phase metering chip, and a voltage-sampling resistor. The current-sampling resistor is connected between an alternating-current power supply and the load. The current-sampling resistor is also connected with the three-phase metering chip. The voltage-sampling resistor is connected with the alternating-current power supply and the three-phase metering chip. The detection circuit provided by the utility model is lower in power consumption and is higher in detection precision.
Description
Technical field
The utility model relates to a kind of testing circuit, relates in particular to a kind of testing circuit for detection of output current, voltage.
Background technology
Voltage and current detection circuit are the circuit that produces output signal when input voltage and electric current exceed preset value.The noise tolerance of traditional voltage and current detection circuit is more weak, if voltage and current detection circuit are operated under large noise circumstance, and near comparer turn threshold point during detection signal, if comparer speed is enough fast, near can response noises, and noise be also in larger situation, and output terminal can produce larger noise, be the output signal of output terminal can be between low and high level unordered beating, the power consumption of voltage and current detection circuit also can obviously increase.Therefore the testing circuit for detection of output current, voltage that a kind of power consumption is lower and accuracy of detection is higher is provided.
Utility model content
The technical matters that the utility model mainly solves is to provide a kind of testing circuit for detection of output current, voltage, can low-power consumption, the output current to load, voltage detect accurately.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of testing circuit for detection of output current, voltage is provided, comprise current sampling resistor, three-phase electrical energy computation chip, voltage sampling resistor, described current sampling resistor is connected between AC power and load, described current sampling resistor is also connected with described three-phase electrical energy computation chip, and described voltage sampling resistor is connected with AC power and three-phase electrical energy computation chip.
Wherein, described for detection of output current, the testing circuit of voltage also comprises a resistance, one relay, one diode, one triode, one capacitor C 53, one capacitor C 54, the first pin of described load is connected with the first contact of the first switch of described relay by described resistance, the second contact of the first switch of described relay is connected with the first end of capacitor C 53, the second contact of the first switch of described relay is also directly connected with the live wire of AC power, the second end of described capacitor C 53 is connected with the first end of described current sampling resistor, the second end of described current sampling resistor is connected with the zero line of AC power, the second pin of described load is connected with the first contact of the second switch of described relay, the second contact of the second switch of described relay is connected with described current sampling resistor first end, the first end of the coil of described relay is connected with+5V power supply, also directly be connected with the negative electrode of diode, the anode of described diode is connected with the second end of coil, the anode of described diode is connected with the collector of described triode, the base stage of described triode is connected with one end of resistance, the second end of described resistance is connected with the first end of described resistance, the base stage of described triode is also connected with the zero line of described AC power by described capacitor C 54, the emitter of described triode is directly connected with the zero line of described AC power.
Wherein, described three-phase electrical energy computation chip comprises 24 pins, and the first pin of described three-phase electrical energy computation chip is vacant; The second pin ground connection, described the second pin is also by a resistance eutral grounding, and described the second pin is also connected with the 3rd pin by an electric capacity; Described the 3rd pin is also directly connected with D5V power supply, and described the 3rd pin is also connected with+5V power supply by a resistance; The 4th pin and+node between 5V power supply is by a capacity earth; The 5th pin is connected by the node between a resistance and described current sampling resistor and described capacitor C 53, and described the 5th pin is also by a capacity earth; The 6th pin is connected with the second end of described current sampling resistor by a resistance, and the node between described the 6th pin and described resistance is by a capacity earth; The 7th pin, the 8th pin, the 9th pin, the tenth pin and the equal ground connection of the 11 pin; Node between described the 11 pin and the earth is connected with one end of a capacitor C 58, and the other end of described capacitor C 58 is connected with the 12 pin, and a capacitor C 59 is connected in parallel with described capacitor C 58; The 13 pin is connected with the base stage of described triode by resistance, electric capacity successively, node between described resistance and described electric capacity is connected with the zero line of AC power, described the 13 pin is connected with electric capacity with the node of described resistance, and the other end of described electric capacity is connected with the node between resistance and the emitter of triode; The 15 pin is connected with the other end of described electric capacity by a voltage sampling resistor, and described the 15 pin is also connected with the 16 pin by voltage sampling resistor and electric capacity successively; Described the 16 pin is all connected with described the 15 pin and the 14 pin, and described the 14 pin is also connected with the live wire of AC power by a resistance; The 17 pin is vacant; The 18 pin is vacant; The 20 pin is connected with the first end of crystal oscillator, and the first end of described crystal oscillator is also by a capacity earth, and the second end of described crystal oscillator is by a capacity earth, and the second end of described crystal oscillator is also connected with the 19 pin; The 21 pin; The 22 pin; The 23 pin; The 24 pin; The 21 pin, the 22 pin, the 23 pin and the 24 pin are vacant.
Wherein, described three-phase electrical energy computation chip is the three-phase electrical energy computation chip of ADE7758 model.
The beneficial effects of the utility model are: the situation that is different from prior art, testing circuit for detection of output current, voltage of the present utility model is owing to adopting three-phase electrical energy computation chip to carry out output current, voltage measurement to load, by current sampling resistor, loop current is sampled, sampled signal is passed to three-phase electrical energy computation chip, thereby the measurement output current of accurate and low-power consumption, voltage sampling resistor is after dividing potential drop sampling, sampling voltage is passed to three-phase electrical energy computation chip, thus the measurement output voltage of accurate and low-power consumption.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the utility model for detection of testing circuit first embodiment of output current, voltage.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, Fig. 1 is the circuit diagram of the utility model for detection of testing circuit first embodiment of output current, voltage.The testing circuit for detection of output current, voltage of the present embodiment, for the electric current, the voltage that export load to are detected, comprise current sampling resistor R67, three-phase electrical energy computation chip U2, voltage sampling resistor R69, described current sampling resistor R67 is connected between AC power and load, described current sampling resistor R67 is also connected with described three-phase electrical energy computation chip U2, and described voltage sampling resistor R69 is connected with AC power and three-phase electrical energy computation chip U2.
The first pin of described load is connected with the first contact of the first switch of relay K 2 by resistance R T4, and the second contact of the first switch of described relay K 2 is connected with the 5th pin IAP of three-phase electrical energy computation chip U2 by capacitor C 53 and resistance R 66 successively.The second contact of the first switch of described relay K 2 is also directly connected with the live wire of AC power.
The second pin of described load is directly connected with the first contact of the second switch of relay K 2, the second contact of the second switch of described relay K 2 is connected with the first end of current sampling resistor R67, the second end of described current sampling resistor R67 is connected with the 6th pin IAN of three-phase electrical energy computation chip U2 by resistance R 68, and the second end of described current sampling resistor R67 is also connected with the zero line of AC power.The first end of described current sampling resistor R67 also with capacitor C 53 and resistance R 66 between node be connected.
The first end of the coil of described relay K 2 is connected with+5V power supply, also directly be connected with the negative electrode of diode D12, the anode of described diode D12 is connected with the second end of coil, the anode of described diode D12 is connected with the collector of triode Q5, the base stage of described triode Q5 is connected with one end of resistance R 75, the second end of described resistance R 75 is connected with the first end of described resistance R 4, the base stage of described triode Q5 is also successively by capacitor C 64, resistance R 70 is connected with the 13 pin VN of three-phase electrical energy computation chip U2, node between described capacitor C 64 and resistance R 70 is connected with zero line, the 13 pin VN of described three-phase electrical energy computation chip U2 is connected one end of capacitor C 60 with the node of resistance R 70, the other end of described capacitor C 60 is connected with the node between resistance R 70 and the emitter of described triode Q5, the emitter of described triode Q5 also with capacitor C 64 and resistance R 70 between node be connected, the emitter of described Q5 is also directly connected with the second end of current sampling resistor R67.
Live wire is connected with the second contact of the first switch of relay K 2, and described live wire is also connected with the 14 pin VCP of described three-phase electrical energy computation chip U2 by resistance R 71.
Described three-phase electrical energy computation chip U2 comprises 24 pins, wherein: the first pin APCF is vacant; The second pin DGND ground connection of described three-phase electrical energy computation chip U2, described the second pin DGND is also by resistance R 64 ground connection, and described the second pin DGND is also connected with the 3rd pin DVDD by capacitor C 50; Described the 3rd pin DVDD is also directly connected with D5V power supply, and described the 3rd pin DVDD is also connected with+5V power supply by resistance R 65; Described the 4th pin AVDD and+node between 5V power supply is by capacitor C 51 ground connection; Node between described the 5th pin IAP and resistance R 66 is by capacitor C 52 ground connection; Node between described the 6th pin IAN and resistance R 68 is by capacitor C 54 ground connection; Described the 7th pin IBP, the 8th pin IBN, the 9th pin ICP, the tenth ICN and the equal ground connection of the 11 pin AGND; Node between described the 11 pin AGND and the earth is connected with one end of capacitor C 58, and the other end of described capacitor C 58 is connected with the 12 pin REF, and capacitor C 59 is connected in parallel with described capacitor C 58.
The 15 pin VBP of described three-phase electrical energy computation chip U2 is connected with the other end of capacitor C 60 by voltage sampling resistor R69, and described the 15 pin VBP is also connected with the 16 pin VAP by voltage sampling resistor R69 and capacitor C 57 successively; Described the 16 pin VAP is all connected with the 15 pin VBP and the 14 pin VCP; Described the 14 pin VCP is also connected with the live wire of AC power by a resistance R 71; Described the 17 pin VARCF is vacant; Described the 18 pin IRQ2 is vacant; Described the 20 pin CLKOUT is connected with the first end of crystal oscillator Y2, and the first end of described crystal oscillator Y2 is also by capacitor C 56 ground connection, and the second end of described crystal oscillator Y2 is connected with the 19 pin CLKIN, and the second end of described crystal oscillator Y2 is also by capacitor C 55 ground connection; Described the 21 pin CS, the 22 pin DIN, the 23 pin SCLK and the 24 pin DOUT are vacant.
In the present embodiment, described three-phase electrical energy computation chip U2 adopts the three-phase electrical energy computation chip U2 that model is ADE7758, should be appreciated that in other embodiment, can also adopt three electric energy computation chips of other models.
The utility model embodiment adopts three-phase electrical energy computation chip to carry out output current, voltage measurement to load, by current sampling resistor, loop current is sampled, sampled signal is passed to three-phase electrical energy computation chip, thereby Measurement accuracy output current, voltage sampling resistor is after dividing potential drop sampling, sampling voltage is passed to three-phase electrical energy computation chip, thus Measurement accuracy output voltage.
These are only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. the testing circuit for detection of output current, voltage, for the electric current, the voltage that export load to are detected, it is characterized in that: comprise current sampling resistor (R67), three-phase electrical energy computation chip (U2), voltage sampling resistor (R69), described current sampling resistor (R67) is connected between AC power and load, described current sampling resistor (R67) is also connected with described three-phase electrical energy computation chip (U2), and described voltage sampling resistor (R69) is connected with AC power and three-phase electrical energy computation chip (U2).
2. as claimed in claim 1 for detection of output current, the testing circuit of voltage, it is characterized in that: also comprise a resistance (RT4), one relay (K2), one diode (D12), one triode (Q5), one capacitor C 53, one capacitor C 54, the first pin of described load is connected with the first contact of the first switch of described relay (K2) by described resistance (RT4), the second contact of the first switch of described relay (K2) is connected with the first end of capacitor C 53, the second contact of the first switch of described relay (K2) is also directly connected with the live wire of AC power, the second end of described capacitor C 53 is connected with the first end of described current sampling resistor (R67), the second end of described current sampling resistor (R67) is connected with the zero line of AC power, the second pin of described load is connected with the first contact of the second switch of described relay (K2), the second contact of the second switch of described relay (K2) is connected with the first end of described current sampling resistor (R67), the first end of the coil of described relay (K2) is connected with+5V power supply, also directly be connected with the negative electrode of diode (D12), the anode of described diode (D12) is connected with the second end of coil, the anode of described diode (D12) is connected with the collector of described triode (Q5), the base stage of described triode (Q5) is connected with one end of resistance (R75), the second end of described resistance R 75 is connected with the first end of resistance R 4, the base stage of described triode (Q5) is also connected with the zero line of described AC power by described capacitor C 54, the emitter of described triode (Q5) is directly connected with the zero line of described AC power.
3. the testing circuit for detection of output current, voltage as claimed in claim 2, it is characterized in that: described three-phase electrical energy computation chip (U2) comprises 24 pins, first pin (APCF) of described three-phase electrical energy computation chip (U2) is vacant; The second pin (DGND) ground connection, described the second pin (DGND) is also by a resistance (R64) ground connection, and described the second pin (DGND) is also connected with the 3rd pin (DVDD) by an electric capacity (C50); Described the 3rd pin (DVDD) is also directly connected with D5V power supply, and described the 3rd pin (DVDD) is also connected with+5V power supply by a resistance (R65); The 4th pin (AVDD) and+node between 5V power supply is by an electric capacity (C51) ground connection; The 5th pin (IAP) is connected by the node between a resistance (R66) and described current sampling resistor (R67) and described capacitor C 53, and described the 5th pin (IAP) is also by an electric capacity (C52) ground connection; The 6th pin (IAN) is connected with the second end of described current sampling resistor (R67) by a resistance (R68), and the node between described the 6th pin (IAN) and described resistance (R66) is by an electric capacity (C52) ground connection; The 7th pin (IBP), the 8th pin (IBN), the 9th pin (ICP), the tenth pin (ICN) and the 11 pin (AGND) be ground connection all; Node between described the 11 pin (AGND) and the earth is connected with one end of a capacitor C 58, and the other end of described capacitor C 58 is connected with the 12 pin (REF), and a capacitor C 59 is connected in parallel with described capacitor C 58; The 13 pin (VN) is connected with the base stage of described triode Q5 by resistance (R70), electric capacity (C64) successively, node between described resistance (R70) and described electric capacity (C64) is connected with the zero line of AC power, described the 13 pin (VN) is connected with electric capacity (C60) with the node of described resistance (R70), and the other end of described electric capacity (C60) is connected with the node between resistance (R70) and the emitter of triode (Q5); The 15 pin (VBP) is connected with the other end of described electric capacity (C60) by described voltage sampling resistor (R69), and described the 15 pin (VBP) is also connected with the 16 pin (VAP) by voltage sampling resistor (R69) and electric capacity (C57) successively; Described the 16 pin (VAP) is all connected with described the 15 pin (VBP) and the 14 pin (VCP), and described the 14 pin (VCP) is also connected with the live wire of AC power by a resistance (R71); The 17 pin (CLKIN) is vacant; The 18 pin (IRQ) is vacant; The 20 pin (CLKOUT) is connected with the first end of crystal oscillator (Y2), the first end of described crystal oscillator (Y2) is also by an electric capacity (C56) ground connection, the second end of described crystal oscillator (Y2) is by an electric capacity (C55) ground connection, and the second end of described crystal oscillator (Y2) is also connected with the 19 pin (CLKIN); The 21 pin (CS); The 22 pin (DIN); The 23 pin (SCLK); The 24 pin (DOUT); The 21 pin (CS), the 22 pin (DIN), the 23 pin (SCLK) and the 24 pin (DOUT) are vacant.
4. the testing circuit for detection of output current, voltage as claimed in claim 1, is characterized in that: the three-phase electrical energy computation chip (U2) that described three-phase electrical energy computation chip (U2) is ADE7758 model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320512513.1U CN203572864U (en) | 2013-08-21 | 2013-08-21 | Detection circuit for detecting output current and voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320512513.1U CN203572864U (en) | 2013-08-21 | 2013-08-21 | Detection circuit for detecting output current and voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203572864U true CN203572864U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320512513.1U Expired - Fee Related CN203572864U (en) | 2013-08-21 | 2013-08-21 | Detection circuit for detecting output current and voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203572864U (en) |
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2013
- 2013-08-21 CN CN201320512513.1U patent/CN203572864U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20210821 |
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| CF01 | Termination of patent right due to non-payment of annual fee |