CN204287447U - A kind of alternating current-direct current input detecting circuit - Google Patents

A kind of alternating current-direct current input detecting circuit Download PDF

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Publication number
CN204287447U
CN204287447U CN201420779963.1U CN201420779963U CN204287447U CN 204287447 U CN204287447 U CN 204287447U CN 201420779963 U CN201420779963 U CN 201420779963U CN 204287447 U CN204287447 U CN 204287447U
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Prior art keywords
resistance
voltage stabilizing
divider resistance
diode
circuit
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CN201420779963.1U
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Chinese (zh)
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陈开鑫
蒋中为
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SHENZHEN GOLD POWER TECHNOLOGY Co Ltd
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SHENZHEN GOLD POWER TECHNOLOGY Co Ltd
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Abstract

The utility model is a kind of alternating current-direct current input detecting circuit, comprises sample circuit, also comprises bleeder circuit, DC isolation circuit and judge module; Wherein bleeder circuit exports 1/3rd of the output of sample circuit through DC isolation circuit and enters decision circuitry, the single-chip microcomputer U1 of decision circuitry detects the signal of the tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2, if square wave, then being judged as exchanging input, if do not have square wave, is direct current input.

Description

A kind of alternating current-direct current input detecting circuit
Technical field
The utility model relates to alterating and direct current power sense circuit.
Background technology
At traditional alternating current-direct current testing circuit, the signal exchanging input 90Vac ~ 290Vac is easy to judge, the signal 126Vdc ~ 406Vdc of direct current input is also easy to when its ripple is little judge.But when DC input voitage 126Vdc ~ 406Vdc has very large AC compounent, traditional alternating current-direct current testing circuit is often mistaken for direct current very large for AC compounent input and exchanges input, and the erroneous judgement of single-chip microcomputer adds that the data analysis of mistake makes power supply can not realize exchanging the work of 90Vac ~ 290Vac/ direct current 126Vdc ~ 406Vdc gamut.
Utility model content
The utility model provides a kind of novel alternating current-direct current input detecting circuit, and what utilize this alternating current-direct current input detecting circuit can judge input is AC power or direct supply.
The technical solution of the utility model is a kind of alternating current-direct current input detecting circuit, comprises sample circuit, also comprises bleeder circuit, DC isolation circuit and judge module.
Described bleeder circuit comprises the first divider resistance, the second divider resistance, the 3rd divider resistance and the derided capacitors of series winding; Described sample circuit through the first divider resistance, the second divider resistance, the 3rd divider resistance ground connection, derided capacitors and the 3rd divider resistance ground connection earth.
Described DC isolation circuit comprises the second electric capacity.
One end that V1 connects the second electric capacity is exported between the first described divider resistance and the second divider resistance.
Reference point V4 between the second described divider resistance and the 3rd divider resistance connects the AN5 pin of single-chip microcomputer.
Described judge module comprises voltage stabilizing diode ZD1, voltage stabilizing diode ZD2 and single-chip microcomputer U1; Described voltage stabilizing diode ZD1, voltage stabilizing diode ZD2 connect, and the negative electrode of voltage stabilizing diode ZD1 meets the other end V2 of the second electric capacity, the plus earth of voltage stabilizing diode ZD2; The tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2 connects the AN2 pin of single-chip microcomputer U1.
Described single-chip microcomputer U1 detects the signal of the tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2, if square wave, is then judged as exchanging input, if do not have square wave, is direct current input.
In the utility model, also have following preferably consideration:
The first described divider resistance comprises resistance R2 and the resistance R4 of series winding; The second described divider resistance is resistance R5; The 3rd described divider resistance is that resistance R7 and resistance R8 is in parallel; Described derided capacitors comprises electric capacity E1 in parallel and electric capacity E2.Resistance R2, resistance R4, resistance R5 resistance are identical, resistance small resistor R2 order of magnitude of resistance R7 and resistance R8.
Sample circuit is full-wave rectifying circuit, comprises diode D1, diode D2, current-limiting resistance R1, current-limiting resistance R3; One end AC1 of signal to be detected connects the anode of diode D1 by current-limiting resistance R1, the other end AC2 of signal to be detected connects the anode of diode D2 by current-limiting resistance R3; Described diode D1 is connected with the negative electrode of diode D2, forms the output of sample circuit.
The chip model of single-chip microcomputer U1 is PIC16F688.
In technical scheme of the present utility model, microprocessor is independently controlled each tested battery the constant-current charge source of charging and the discharge circuit carrying out constant-current discharge by circuit passband, and circuit is simple, makes circuit obtain Appropriate application, decreases the use of device.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the utility model comparison reference signal.
Embodiment
Embodiment 1, the present embodiment is a kind of alternating current-direct current input detecting circuit, comprises sample circuit, also comprises bleeder circuit, DC isolation circuit and judge module.
Bleeder circuit comprises the first divider resistance, the second divider resistance, the 3rd divider resistance and the derided capacitors of series winding; Sample circuit through the first divider resistance, the second divider resistance, the 3rd divider resistance ground connection, derided capacitors and the 3rd divider resistance ground connection earth.Divider resistance, by the voltage signal of sampling circuit samples, exports original 1/3rd.
First divider resistance comprises resistance R2 and the resistance R4 of series winding; Second divider resistance is resistance R5; 3rd divider resistance is that resistance R7 and resistance R8 is in parallel; Derided capacitors comprises electric capacity E1 in parallel and electric capacity E.The effect filter action of E1 and E2, voltage waveform by V4 is filtered into level and smooth direct current signal, facilitate Chip Microcomputer A/D to sample, the voltage of V4 with exchange the voltage effective value Vin_ac_rms inputted and become a linear K proportionate relationship doubly: V4=Vin_ac_rms*K.
DC isolation circuit comprises the second electric capacity; Second electric capacity is made up of electric capacity C2 and electric capacity C1, and electric capacity C2 and electric capacity C1 connects.
One end that V1 connects the second electric capacity is exported between first divider resistance and the second divider resistance.
Reference point V4 between second divider resistance and the 3rd divider resistance connects the AN5 pin of single-chip microcomputer.
Judge module comprises voltage stabilizing diode ZD1, voltage stabilizing diode ZD2 and single-chip microcomputer U1; Voltage stabilizing diode ZD1, voltage stabilizing diode ZD2 connect, and the negative electrode of voltage stabilizing diode ZD1 meets the other end V2 of the second electric capacity, the plus earth of voltage stabilizing diode ZD2; The tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2 connects the AN2 pin of single-chip microcomputer U1.
The chip model of single-chip microcomputer U1 is PIC16F688, detects the signal of the tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2, if square wave, is then judged as exchanging input, if do not have square wave, is direct current input.Resistance R2, resistance R4, resistance R5 resistance are identical, resistance small resistor R2 order of magnitude of resistance R7 and resistance R8.In the present embodiment, resistance R2, resistance R4, resistance R5 selectable resistance values are selected as 510K, and the selectable resistance values of resistance R7 and resistance R8 selects the resistance of 33K.
When measured signal is for when exchanging input: exchange input and enter input sampling circuit from AC1, AC2, after resistance R2, R4, R5, R7, R8 and electric capacity E1, E2, attenuated input signal is the half-sinusoid V1 containing DC component, and V1 is made up of two parts: DC component Vsignal and AC compounent Vsignal_ac input signal are after electric resistance partial pressure decay.V1=Vsignal_dc+Vsignal_ac。V1 DC component after electric capacity C1, C2 coupling is removed, and produce the half-sinusoid of V2, the signal of V2 is V2=Vsignal_ac.The half-sinusoid peak value of V2 is greater than the threshold voltage of stabilivolt ZD1+ZD2, and V3 produces a square-wave signal, as shown in Figure 2.Microprocessor detect is judged as exchanging input to square-wave signal, and normally works in conjunction with Switching Power Supply under voltage effective value realization interchange 90Vac ~ 290Vac scope of V4.
When direct current inputs: direct current input has very large ripple.Direct current input enters input sampling circuit from AC1, AC2, after resistance R2, R4, R5, R7, R8 and electric capacity E1, E2, attenuated input signal is that the half-sinusoid V1 containing DC component, V1 DC component after electric capacity C1, C2 coupling is removed, and produces the half-sinusoid of V2.Half-sinusoid peak value due to V2 is less than the threshold voltage of stabilivolt ZD1+ZD2, thus can not conducting stabilivolt ZD1 and ZD2, the ripple disturbance of direct current input has been blocked by ZD1 and ZD2, V3 place there will not be square-wave signal, thus monolithic function judges now as direct current input, and under realizing direct current 126Vdc ~ 406Vdc scope in conjunction with the voltage effective value of V4, Switching Power Supply normally works.The voltage at V4 place can not more than 5V, V3 by stabilivolt ZD2 clamper, the square-wave signal of V3 to be amplitude be 5V.

Claims (5)

1. an alternating current-direct current input detecting circuit, comprises sample circuit, it is characterized in that: also comprise bleeder circuit, DC isolation circuit and judge module;
Described bleeder circuit comprises the first divider resistance, the second divider resistance, the 3rd divider resistance and the derided capacitors of series winding; Described sample circuit through the first divider resistance, the second divider resistance, the 3rd divider resistance ground connection, derided capacitors and the 3rd divider resistance ground connection earth;
Described DC isolation circuit comprises the second electric capacity;
One end that V1 connects the second electric capacity is exported between the first described divider resistance and the second divider resistance;
Reference point V4 between the second described divider resistance and the 3rd divider resistance connects the AN5 pin of single-chip microcomputer;
Described judge module comprises voltage stabilizing diode ZD1, voltage stabilizing diode ZD2 and single-chip microcomputer U1; Described voltage stabilizing diode ZD1, voltage stabilizing diode ZD2 connect, and the negative electrode of voltage stabilizing diode ZD1 meets the other end V2 of the second electric capacity, the plus earth of voltage stabilizing diode ZD2; The tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2 connects the AN2 pin of single-chip microcomputer U1;
Described single-chip microcomputer U1 detects the signal of the tie point V3 of voltage stabilizing diode ZD1 and voltage stabilizing diode ZD2, if square wave, is then judged as exchanging input, if do not have square wave, is direct current input.
2. alternating current-direct current input detecting circuit according to claim 1, is characterized in that: the first described divider resistance comprises resistance R2 and the resistance R4 of series winding; The second described divider resistance is resistance R5; The 3rd described divider resistance is that resistance R7 and resistance R8 is in parallel; Described derided capacitors comprises electric capacity E1 in parallel and electric capacity E2.
3. alternating current-direct current input detecting circuit according to claim 2, is characterized in that: resistance R2, resistance R4, resistance R5 resistance are identical, resistance small resistor R2 order of magnitude of resistance R7 and resistance R8.
4. alternating current-direct current input detecting circuit according to claim 1, is characterized in that: sample circuit is full-wave rectifying circuit, comprises diode D1, diode D2, current-limiting resistance R1, current-limiting resistance R3; One end AC1 of signal to be detected connects the anode of diode D1 by current-limiting resistance R1, the other end AC2 of signal to be detected connects the anode of diode D2 by current-limiting resistance R3; Described diode D1 is connected with the negative electrode of diode D2, forms the output of sample circuit.
5., according to described alternating current-direct current input detecting circuit arbitrary in Claims 1-4, it is characterized in that: the chip model of described single-chip microcomputer U1 is PIC16F688.
CN201420779963.1U 2014-12-11 2014-12-11 A kind of alternating current-direct current input detecting circuit Active CN204287447U (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111123095A (en) * 2018-10-31 2020-05-08 佛山市顺德区美的电热电器制造有限公司 Detection circuit, motor detection method, motor and household appliance
CN112098705A (en) * 2020-09-17 2020-12-18 株洲中车时代电气股份有限公司 System and method for rapidly identifying AC/DC power supply system
WO2022206646A1 (en) * 2021-03-31 2022-10-06 维沃移动通信有限公司 Power source chip testing circuit, power source chip testing method and apparatus, and electronic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111123095A (en) * 2018-10-31 2020-05-08 佛山市顺德区美的电热电器制造有限公司 Detection circuit, motor detection method, motor and household appliance
CN111123095B (en) * 2018-10-31 2022-09-27 佛山市顺德区美的电热电器制造有限公司 Detection circuit, motor detection method, motor and household appliance
CN112098705A (en) * 2020-09-17 2020-12-18 株洲中车时代电气股份有限公司 System and method for rapidly identifying AC/DC power supply system
WO2022206646A1 (en) * 2021-03-31 2022-10-06 维沃移动通信有限公司 Power source chip testing circuit, power source chip testing method and apparatus, and electronic device

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Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province

Patentee after: Shenzhen Gold Power Technology Co., Ltd.

Address before: 518000 Shenzhen, Guangdong, Pingshan new industrial zone, poly dragon hill area Jinwei Industrial Zone A 1 floor.

Patentee before: Shenzhen Gold Power Technology Co., Ltd.

CP02 Change in the address of a patent holder