CN203929854U - Voltage magnitude testing circuit - Google Patents

Voltage magnitude testing circuit Download PDF

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Publication number
CN203929854U
CN203929854U CN201420327420.6U CN201420327420U CN203929854U CN 203929854 U CN203929854 U CN 203929854U CN 201420327420 U CN201420327420 U CN 201420327420U CN 203929854 U CN203929854 U CN 203929854U
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CN
China
Prior art keywords
circuit
voltage
signal
trigger
clamping
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Expired - Fee Related
Application number
CN201420327420.6U
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Chinese (zh)
Inventor
孙柏峰
费翔
季丹
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AO Smith China Water Heater Co Ltd
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AO Smith China Water Heater Co Ltd
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Priority to CN201420327420.6U priority Critical patent/CN203929854U/en
Application granted granted Critical
Publication of CN203929854U publication Critical patent/CN203929854U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a kind of voltage magnitude testing circuit, this circuit comprises: clamping circuit, for tested AC signal is carried out to voltage clamping; Divided circuit, in parallel with clamping circuit, for tested AC signal is shunted; Trigger circuit, are connected with clamping circuit, while reaching predetermined trigger voltage, trigger the operation of strong and weak electricity buffer circuit for the tested AC signal after voltage clamping; Strong and weak electricity buffer circuit, is connected with trigger circuit, for being triggered after circuit triggers, and the signal that output detects for voltage magnitude.Compared with prior art, circuit cost is lower for the utility model, and the shared PCB space of circuit is less, takies I/O mouth resource less.

Description

Voltage magnitude testing circuit
Technical field
The utility model relates to circuit engineering field, relates in particular to voltage magnitude testing circuit.
Background technology
Prior art adopts line style transformer by AC (Alternating Current, alternating current) forceful electric power signal transfers weak electric signal to, draw a road as frequency detecting, the rectifying and wave-filtering magnitude of voltage of separately leading up to input amplifier or single-chip microcomputer calculate, and obtain corresponding supply voltage thereby table look-up.ECO detects (break-make of determining the loop that tested AC signal is provided) and adopts independent optocoupler acquisition testing circuit.
But, prior art is because adopting transformer combination, make circuit cost higher, the shared PCB of circuit (Printed CircuitBoard, printed circuit board (PCB)) space is larger, and detect by different I/O (Input/Output, I/O) mouthful respectively for frequency, voltage and ECO break-make, take I/O mouth resource more.
Utility model content
The utility model embodiment provides a kind of voltage magnitude testing circuit, in order to reduce circuit cost, reduces shared PCB space and the I/O mouth resource of circuit, and this circuit comprises:
Clamping circuit, for carrying out voltage clamping to tested AC signal;
Divided circuit, in parallel with clamping circuit, for tested AC signal is shunted;
Trigger circuit, are connected with clamping circuit, while reaching predetermined trigger voltage, trigger the operation of strong and weak electricity buffer circuit for the tested AC signal after voltage clamping;
Strong and weak electricity buffer circuit, is connected with trigger circuit, for being triggered after circuit triggers, and the signal that output detects for voltage magnitude.
In an embodiment, described clamping circuit comprises the voltage stabilizing diode and the resistance that are connected in series.
In an embodiment, described divided circuit comprises resistance.
In an embodiment, described trigger circuit comprise MOS (Metal-Oxide-Semiconductor, metal-oxide semiconductor (MOS)) pipe, field effect transistor, triode or Schmidt trigger.
In an embodiment, described strong and weak electricity buffer circuit comprises optocoupler.
In the utility model embodiment, voltage magnitude testing circuit adopts clamping circuit to carry out voltage clamping to tested AC signal, divided circuit is shunted tested AC signal, when the tested AC signal of trigger circuit after voltage clamping reaches predetermined trigger voltage, trigger the operation of strong and weak electricity buffer circuit, strong and weak electricity buffer circuit is being triggered after circuit triggers, the signal that output detects for voltage magnitude, compared with prior art, in circuit without adopt linear transformer, can save very large spending, reduce circuit cost, and the shared PCB space of circuit is less, and this circuit can be realized voltage magnitude and detect, take I/O mouth resource less.Further, in an embodiment, this voltage magnitude testing circuit not only can be realized voltage magnitude and detect, and can also determine the break-make in the loop that tested AC signal is provided.
Brief description of the drawings
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 skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.In the accompanying drawings:
Fig. 1 is the structured flowchart of voltage magnitude testing circuit in the utility model embodiment;
Fig. 2 is the instantiation figure of voltage magnitude testing circuit in the utility model embodiment;
Fig. 3 is the principle of work exemplary plot of voltage magnitude testing circuit in the utility model embodiment;
Fig. 4 utilizes voltage magnitude testing circuit to carry out the schematic diagram of the method for voltage magnitude detection in the utility model embodiment;
Fig. 5 is the principle schematic that in the utility model embodiment, voltage magnitude detects.
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with accompanying drawing, the utility model embodiment is described in further details.At this, schematic description and description of the present utility model is used for explaining the utility model, but not as to restriction of the present utility model.
In order to reduce circuit cost, reduce shared PCB space and the I/O mouth resource of circuit, a kind of voltage magnitude testing circuit is provided in the utility model embodiment, Fig. 1 is the structured flowchart of voltage magnitude testing circuit in the utility model embodiment, as shown in Figure 1, comprise at this voltage magnitude testing circuit:
Clamping circuit 101, for carrying out voltage clamping to tested AC signal;
Divided circuit 102, in parallel with clamping circuit 101, for tested AC signal is shunted;
Trigger circuit 103, are connected with clamping circuit 101, while reaching predetermined trigger voltage, trigger strong and weak electricity buffer circuit 104 and move for the tested AC signal after voltage clamping;
Strong and weak electricity buffer circuit 104, is connected with trigger circuit 103, after triggering at the circuit 103 that is triggered, and the signal that output detects for voltage magnitude.
When the above-mentioned voltage magnitude testing circuit of specific implementation, can adopt various ways.For example, clamping circuit can be realized by the voltage stabilizing diode being connected in series and resistance, or also can utilize Voltage stabilizing module, amplifier etc. to realize, in embodiment below, comprise that taking clamping circuit the voltage stabilizing diode that is connected in series and resistance describe as example, when enforcement, the cost of Voltage stabilizing module and amplifier is higher than the combination of voltage stabilizing diode and resistance.Further, divided circuit for example can be realized by resistance etc.Trigger circuit for example can be realized by metal-oxide-semiconductor, field effect transistor, triode or Schmidt trigger etc.Strong and weak electricity buffer circuit can be realized by optocoupler etc.
Can be by adjusting the resistance of divided circuit in embodiment, make most of electric current divided circuit of flowing through; By clamping circuit and divided circuit, can allow trigger circuit react on clamping circuit with the different change in pressure drop that produce of temperature, make the temperature of trigger voltage float reduction.
Below for the voltage magnitude testing circuit in instantiation explanation the utility model embodiment.
Fig. 2 is the structural drawing of voltage magnitude testing circuit in this example.As shown in Figure 2, in this example, clamping circuit comprises the voltage stabilizing diode D28 and the resistance R 22 that are connected in series; Divided circuit comprises resistance R 110; Trigger circuit comprise metal-oxide-semiconductor Q17; Strong and weak electricity buffer circuit comprises optocoupler U5.
Fig. 3 is the principle of work exemplary plot of voltage magnitude testing circuit in this example, as shown in Figure 3, in this example, tested AC signal AC inputs to voltage stabilizing diode D28 and resistance R 22 is carried out clamper, and shunted by resistance R 110, after tested AC signal reaches trigger voltage, metal-oxide-semiconductor Q17 triggers, optocoupler U5 triggers afterwards, the signal that optocoupler U5 output detects for voltage magnitude, for example export a weak electric signal voltage supplied amplitude detection, for example this weak electric signal can be by MCU (Micro ControlUnit, single-chip microcomputer) gather, MCU can carry out voltage magnitude detection after collecting weak electric signal.
As shown in Figure 2, in embodiment, voltage magnitude testing circuit can also comprise dropping resistor, and tested AC signal is carried out to step-down.The concrete form of dropping resistor, clamping circuit, divided circuit, trigger circuit and strong and weak electricity buffer circuit can be determined according to actual needs, concrete connected mode between these circuit components also can be determined according to actual needs, can realize corresponding function.
For example, dropping resistor can be the combination of the resistance of multiple serial or parallel connections.In Fig. 2, dropping resistor comprises resistance R 112, resistance R 111, resistance R 20 and the resistance R 21 of series connection successively; The wherein tested AC signal AC_POWER_INPUT of input termination of resistance R 112, the negative electrode of the output termination voltage stabilizing diode D28 of resistance R 21.
In example shown in Fig. 2, clamping circuit comprises the voltage stabilizing diode D28 and the resistance R 22 that are connected in series; Divided circuit comprises resistance R 110; Trigger circuit comprise metal-oxide-semiconductor Q17; Strong and weak electricity buffer circuit comprises optocoupler U5; Wherein, the output terminal of the negative electrode connecting resistance R21 of voltage stabilizing diode D28, the anode of voltage stabilizing diode D28 connects the grid G of metal-oxide-semiconductor Q17; The source S ground connection of metal-oxide-semiconductor Q17, drain D connects the input end 1,2 of optocoupler U5.The anode of voltage stabilizing diode D28 is the first end of contact resistance R22 also; The negative electrode of voltage stabilizing diode D28 is the first end of contact resistance R110 also; The equal ground connection of the second end of the second end of resistance R 110 and resistance R 22.In embodiment, in circuit, can also increase according to actual needs the element such as resistance, switching diode.For example, in the example shown in Fig. 2, the negative electrode of voltage stabilizing diode D28 is the negative electrode of connecting valve diode D29 also; The plus earth of switching diode D29.
In embodiment, in the circuit being connected with optocoupler at metal-oxide-semiconductor, also can increase according to actual needs the element such as resistance and switching diode.For example, in the example shown in Fig. 2, the anode of the drain D connecting valve diode D17 of metal-oxide-semiconductor Q17, the first end of the negative electrode contact resistance R23 of switching diode D17, the second termination forceful electric power side stable level VCC of resistance R 23; The negative electrode of switching diode D17 also connects the first input end 1 of optocoupler U5; The drain electrode of metal-oxide-semiconductor Q17 also connects the second input end 2 of optocoupler U5.
In embodiment, the circuit of optocoupler output terminal also can increase the element such as resistance and electric capacity according to actual needs.For example, in the example shown in Fig. 2, the first output terminal 3 ground connection of optocoupler U5; The second first end of output terminal 4 contact resistance R24 and the first end of resistance R 25 of optocoupler U5; The positive 5 volts of level of the second termination of resistance R 24; The second end of resistance R 25 provides weak electric signal VOLTAGE_DETECTION_DIG_IN; The second end of resistance R 25 is also through capacitor C 31 ground connection.Optocoupler U5 plays strong and weak electricity buffer action, and VOLTAGE_DETECTION_DIG_IN output port for example can be received the light current Gather and input end of MCU.
In the utility model embodiment, utilize above-mentioned voltage magnitude testing circuit to carry out voltage magnitude detection.Fig. 4 utilizes voltage magnitude testing circuit to carry out the schematic diagram of the method for voltage magnitude detection in the utility model embodiment, as shown in Figure 4, the method can comprise:
Step 401, the described signal detecting for voltage magnitude of collection;
Step 402, determine that tested AC signal inputs the triggering duration that triggers the described signal detecting for voltage magnitude of output after described voltage magnitude testing circuit, determine the voltage magnitude of tested AC signal according to described triggering duration.
Method shown in Fig. 4 can be implemented by the device that can realize its function, and for example this device can be the signal processing apparatus such as MCU, and in embodiment, being MCU taking this device is elaborated as example.In example example as shown in Figure 2, after tested voltage AC_POWER_INPUT reaches trigger value V0, voltage stabilizing diode D28 conducting, thereby Q17 conducting, optocoupler is triggered, and MCU can collect the signal that VOLTAGE_DETECTION_DIG_IN port returns.
Concrete, in the voltage magnitude testing circuit of the utility model embodiment, directly L line (as shown in Figure 2) is connected to and is exchanged ground by resistance step-down, metal-oxide-semiconductor conducting in the time that L lambda line voltage exceedes certain value, and then optocoupler conducting, the different corresponding metal-oxide-semiconductor switch of input voltage duration differences, single-chip microcomputer can or turn-off duration according to conducting duration and judge AC magnitude of voltage size, and wherein the impact that Low Drift Temperature brings test can fall in the combination of voltage stabilizing diode and resistance to greatest extent.Fig. 5 is the principle schematic that in the utility model embodiment, voltage magnitude detects.As shown in Figure 5, during for different external input voltage V1 and V2, the triggered time T1 recording and T2 are also different, and the algorithm based on certain can calculate the size of input voltage V1 and V2.
Taking circuit shown in Fig. 2 as example, in Fig. 2, voltage stabilizing diode D28 can be a Zener diode, in the time that input voltage reaches 18V by avalanche breakdown, and by voltage stabilization at 18V, along with input voltage rises to 20V or higher, voltage stabilizing diode D28 and metal-oxide-semiconductor Q17 are by conducting, and single-chip microcomputer obtains a zero-signal, and trigger voltage supposition now can be:
V0=(20/R110+2/R22) * (R111+R20+R21)+20=132.4 (supposing Vgs=2V);
The value of this trigger voltage is fixed, and as shown in Figure 5, can draw the different triggered times that different input voltages are corresponding.
In the time that input voltage is 240V/60Hz, the triggered time is calculated as follows:
V0=240*1.414*Sin[ω (T2-1/ (2*60))/2]; Wherein ω=2 π f, f is frequency;
Sin[ω(T2-1/(2*60))/2]=V0/(240*1.414);
ω(T2-1/(2*60))/2=arcSin[V0/(240*1.414)];
T2=2*arcSin[V0/(240*1.414)]/ω+1/120
=0.0104608632721551s;
=10.4608632721551ms
In the time that input voltage is 180V/60Hz, the triggered time is as follows:
T1=2*arcSin[V0/(180*1.414)]/ω+1/120
=0.011237427382717s;
=11.237427382717ms
Can obtain by that analogy the time that each voltage is corresponding, namely corresponding A/D value.
Learn thus, can, by following formula, determine the voltage magnitude of tested AC signal according to described triggering duration:
T=2*arcSin[V0/(V*1.414)]/ω+1/120;
Wherein, T is described triggering duration, and V0 is described trigger voltage, the voltage magnitude that V is tested AC signal, and ω=2 π f, f is frequency.
The voltage magnitude testing circuit of the utility model embodiment can also use as frequency detecting in detecting voltage.In the time carrying out frequency detecting, can, according to the level conversion of the signal (aforementioned weak electric signal) detecting for voltage magnitude collecting, determine the frequency of tested AC signal.Concrete, can be by weak electric signal from first, (when MCU input) redirect is the one-period that duration that high level to redirect is next time high level is defined as tested AC signal.
The voltage magnitude testing circuit of the utility model embodiment can also be served as ECO and be detected use.When enforcement, can realize 185V low pressure alarming, alarm set point voltage accuracy can be controlled at ± 1V through single-chip microcomputer processing.When enforcement, can determine according to the signal detecting for voltage magnitude gathering the break-make in the loop that tested AC signal is provided.Specific implementation process for example can comprise: control trigger voltage and be less than normal work minimum voltage, in the time that the described signal detecting for the voltage magnitude duration that is high level is greater than threshold value, determines and provide the loop of tested AC signal to disconnect; Determine during for square wave and provide the loop of tested voltage AC signal to connect when the described signal detecting for voltage magnitude.In example example as shown in Figure 2, make trigger voltage V0 be less than normal work minimum voltage by adjusting parameter, illustrate that when VOLTAGE_DETECTION_DIG_IN port is output as high level always tested AC signal circuit is disconnected, if what receive is square wave, represent that tested AC signal is for connecting.
In sum, voltage magnitude testing circuit adopts clamping circuit to carry out voltage clamping to tested AC signal, divided circuit is shunted tested AC signal, when the tested AC signal of trigger circuit after voltage clamping reaches predetermined trigger voltage, trigger the operation of strong and weak electricity buffer circuit, strong and weak electricity buffer circuit is being triggered after circuit triggers, the signal that output detects for voltage magnitude, compared with prior art, in circuit without adopt linear transformer, can save very large spending, reduce circuit cost, and the shared PCB space of circuit is less, and this circuit can be realized voltage magnitude and detect, take I/O mouth resource less.Further, in an embodiment, this voltage magnitude testing circuit not only can be realized voltage magnitude and detect, and can also determine the break-make in the loop that tested AC signal is provided.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; and be not used in limit protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (5)

1. a voltage magnitude testing circuit, is characterized in that, comprising:
Clamping circuit, for carrying out voltage clamping to tested AC signal;
Divided circuit, in parallel with clamping circuit, for tested AC signal is shunted;
Trigger circuit, are connected with clamping circuit, while reaching predetermined trigger voltage, trigger the operation of strong and weak electricity buffer circuit for the tested AC signal after voltage clamping;
Strong and weak electricity buffer circuit, is connected with trigger circuit, for being triggered after circuit triggers, and the signal that output detects for voltage magnitude.
2. voltage magnitude testing circuit as claimed in claim 1, is characterized in that, described clamping circuit comprises the voltage stabilizing diode and the resistance that are connected in series.
3. voltage magnitude testing circuit as claimed in claim 1, is characterized in that, described divided circuit comprises resistance.
4. voltage magnitude testing circuit as claimed in claim 1, is characterized in that, described trigger circuit comprise metal-oxide semiconductor (MOS) metal-oxide-semiconductor, field effect transistor, triode or Schmidt trigger.
5. voltage magnitude testing circuit as claimed in claim 1, is characterized in that, described strong and weak electricity buffer circuit comprises optocoupler.
CN201420327420.6U 2014-06-18 2014-06-18 Voltage magnitude testing circuit Expired - Fee Related CN203929854U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104034942A (en) * 2014-06-18 2014-09-10 艾欧史密斯(中国)热水器有限公司 Voltage amplitude detection circuit and method
CN107576868A (en) * 2017-08-28 2018-01-12 珠海格力电器股份有限公司 Ticker working state detecting method, device, circuit and humidifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104034942A (en) * 2014-06-18 2014-09-10 艾欧史密斯(中国)热水器有限公司 Voltage amplitude detection circuit and method
CN107576868A (en) * 2017-08-28 2018-01-12 珠海格力电器股份有限公司 Ticker working state detecting method, device, circuit and humidifier

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141105

Termination date: 20190618