CN104535817A - Transformer isolation direct current voltage detecting device and method - Google Patents
Transformer isolation direct current voltage detecting device and method Download PDFInfo
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- CN104535817A CN104535817A CN201410758855.0A CN201410758855A CN104535817A CN 104535817 A CN104535817 A CN 104535817A CN 201410758855 A CN201410758855 A CN 201410758855A CN 104535817 A CN104535817 A CN 104535817A
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Abstract
The invention discloses a transformer isolation direct current voltage detecting device and method. The device comprises a transformer, the primary end of the transformer is connected with a constant current source module, a demagnetizing module and a sampling module, and the secondary end of the transformer is connected with a direct current load. The constant current source module is used for injecting stable current to the primary end of the transformer regularly. The demagnetizing module is used for demagnetizing the transformer regularly. The sampling module is used for detecting the voltage of a primary winding of the transformer and determining the voltage of the direct current load according to the relation between the primary winding and a secondary winding of the transformer. The method comprises the steps that firstly, the secondary end of the transformer is connected with the detected direct current load; secondly, the primary end of the transformer is connected with a constant current source, a demagnetizing circuit and a sampling circuit; thirdly, current is injected to the primary winding of the transformer according to a certain logic timing sequence, the voltage of the primary winding is sampled, and the transformer is demagnetized; fourthly, the voltage of the direct current load is determined according to the relation between the primary winding and the secondary winding of the transformer.
Description
Technical field
The present invention relates to DC voltage detection technique field, be specifically related to the apparatus and method that a kind of transformer isolation detects DC voltage.
Background technology
Accumulator, due to its energy storage characteristic, has been widely used in the electric power systems such as automobile, uninterruptible power system (UPS), emergency power system (EPS) at present.When outside power interruptions, the electric power system being equipped with accumulator needs it to provide electric energy to outside at this crucial hour; Thus accumulator becomes the last guarantee of power supply safety.But because accumulator is for easily to consume article, need battery-driven crucial moment for ensureing, accumulator normally can provide electric energy; Electric power system then needs configuration battery inspection unit to detect battery condition, and the abnormal accumulator in diagnosis location also changes abnormal accumulator in time as early as possible.The key of battery inspection is battery voltage detection technology.In the voltage detecting of many batteries, due to different battery have difference " " level, voltage non-isolated detection method be difficult to application; Voltage isolation detection method is inevitable choice in battery inspection and its gordian technique is the precision of DC voltage isolation detection.
Existing voltage isolation detection has: voltage transformer (VT) detection, the detection of voltage Hall, light-coupled isolation detection etc.
Hall detection method as shown in Figure 1.Voltage signal Vin acts on generation current I1 on R1 and H1, and Hall element H1 detects 4,5 comparatively inflow current I1, and proportionally output current I2, electric current I 2 flows through R2, obtains and detects voltage Vsense.In this detection method, need the enough large guarantee precision of electric current I 1 flowing through H14,5 pin, be not suitable for the large voltage signal of source signal output impedance and detect; The Hall element simultaneously used, cost is high.The factor such as consider cost and required discharge current is larger, can not widespread use in battery inspection plate.
Optocoupler detection method as shown in Figure 2.The size of the photocontrol U1 output current I2 that generation current I1, I1 make U1 interior light emitting diodes produce in the interior light emitting diodes that voltage signal Vin acts on R1 and U1, electric current I 2 flows through R2, obtains and detects voltage Vsense.In this detection method, because the linearity of optocoupler is not high, make the accuracy of detection of this detection method low.Even if full accuracy linear optical coupling on the market adopting price high, accuracy of detection is also limited.This detection method is not suitable for being applied to high precision test requirement.
Voltage transformer (VT) detection method as shown in Figure 3.Alternating voltage signal Vin acts on the former limit of mutual inductor T1, makes the magnetic core inside of T1 produce alternating magnetic field, and then produces alternating voltage signal Vsense at the secondary of mutual inductor T1.The cost of this detection method is low, is widely used in ac voltage signal detection system; But the method can only detect ac voltage signal, can not be applied in battery DC voltage detection system.
To sum up, Hall detection method cost is high and need voltage signal source to have to export larger current ability; Optocoupler detection method moderate cost, but accuracy of detection is lower; Voltage transformer (VT) detection method cost is low, but can not detect direct current signal.
Summary of the invention
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, provides a kind of transformer isolation to detect the apparatus and method of DC voltage, overcomes the defect that DC voltage detection method accuracy of detection is low and testing cost is high of prior art.
The present invention for solving the problems of the technologies described above adopted technical scheme is:
A kind of transformer isolation detects the device of DC voltage, comprise transformer, the elementary connection constant current source module of described transformer, demagnetization module and sampling module, the secondary connection DC load of described transformer, described constant current source module is used for regularly stable to the elementary injection of described transformer electric current, described demagnetization module is used for timing and carries out demagnetization to described transformer, described sampling module, for detecting described primary winding voltage, determines the voltage of described DC load according to the relation of described primary winding and secondary winding.
According to a particular embodiment of the invention, described demagnetization module comprises on-off element and the dissipative cell of series connection.
According to a particular embodiment of the invention, described constant current source module comprises voltage comparator, and the output terminal of described voltage comparator connects field effect transistor, and the input end of described voltage comparator connects voltage divider resistors, described voltage divider resistors connecting valve element.
According to a particular embodiment of the invention, described sampling module comprises voltage table.
According to a particular embodiment of the invention, described sampling module comprises modulus switching device.
According to a particular embodiment of the invention, described DC load comprises battery, is provided with one-way conduction element between described transformer and described battery.
According to a particular embodiment of the invention, described one-way conduction element is set to diode.
Transformer isolation detects a method for DC voltage, comprises step:
The DC load that the secondary connection of A1, transformer is detected;
The elementary connection constant current source of A2, described transformer, degaussing circuit and sample circuit;
A3, according to the armature winding Injection Current of certain logical sequence to described transformer, the voltage of described armature winding is sampled and demagnetization is carried out to described transformer;
A4, determine the voltage of described DC load according to the relation of described primary winding and secondary winding.
According to a particular embodiment of the invention, described constant current source, described degaussing circuit and described sample circuit are respectively provided with on-off element to realize described logical sequence.
According to a particular embodiment of the invention, described DC load is set to battery.
Implement technical scheme of the present invention, there is following beneficial effect: DC load and sample circuit are isolated by transformer by the present invention, all circuit control part are all positioned at the elementary of transformer, make DC load by the impact of primary signal, the DC voltage detection method of high precision, low cost can not be achieved.
Accompanying drawing explanation
Below by with reference to accompanying drawing describe the present invention particularly in conjunction with example, advantage of the present invention and implementation will be more obvious, wherein content shown in accompanying drawing is only for explanation of the present invention, and does not form restriction of going up in all senses of the present invention, in the accompanying drawings:
Fig. 1 is prior art Hall element isolation detection DC voltage schematic diagram;
Fig. 2 is that prior art light-coupled isolation detects DC voltage schematic diagram;
Fig. 3 is that prior art voltage transformer (VT) detects alternating voltage schematic diagram;
Fig. 4 is the apparatus module figure that transformer isolation of the present invention detects DC voltage;
Fig. 5 is the device embodiment circuit diagram that transformer isolation of the present invention detects DC voltage;
Fig. 6 is the method circuit diagram that transformer isolation of the present invention detects DC voltage;
Fig. 7 is the method steering logic sequential that transformer isolation of the present invention detects DC voltage.
Embodiment
As shown in Figure 4 and Figure 5, transformer isolation of the present invention detects the device of DC voltage, comprise transformer, the elementary connection constant current source module of transformer, demagnetization module and sampling module, the secondary connection DC load of transformer, constant current source module is used for regularly stable to the elementary injection of transformer electric current, demagnetization module is used for timing and carries out demagnetization to transformer, sampling module for detecting primary winding voltage, according to the voltage of the relation determination DC load of primary winding and secondary winding.According to a particular embodiment of the invention, demagnetization module comprises on-off element and the dissipative cell of series connection.Constant current source module comprises voltage comparator, and the output terminal of voltage comparator connects field effect transistor, and the input end of voltage comparator connects voltage divider resistors, voltage divider resistors connecting valve element.Sampling module comprises voltage table or modulus switching device.DC load comprises battery, is provided with one-way conduction element between transformer and battery.One-way conduction element can be diode.
Specific embodiments of the present invention contain transformer portion 1, transformer demagnetization part 2, constant current source part 3, voltage sample part 4 form; Tested DC load is battery 5.When Q1 conducting in constant current source part 3, by the Np winding Injection Current I1 of the transformer T1 toward transformer portion 1, (its size is controlled source stream source part 31
), the Ns winding generation current Is forward of transformer T1 injects battery 5 through D1; Now the Ns winding voltage of transformer T1 is V
b+ V
d(Vb is tested DC voltage, and Vd is diode forward forward voltage), then the Np winding voltage of transformer T1 is
because N is constant, the magnitude of voltage of tested d. c. voltage signal can be calculated by the Np winding voltage of transformer T1.Now, the U41 (analog to digital converter) of trigger voltage sampling section 4 gathers the voltage of Np winding, can obtain the digital quantity that Np winding voltage is corresponding, by calculating tested DC voltage value.When the Q1 in constant current source part 3 turns off, controlled source stream source part 31 stops to transformer T1 Injection Current.The Q2 of transformer demagnetization part 2 is open-minded, and transformer demagnetization part 2 is by the resistance R1 demagnetization of transformer demagnetization part 2; The Q2 of transformer demagnetization part 2 turns off, then stop demagnetization.In implementation process, the Q2 of the Q1 in constant current source part 3, transformer demagnetization part 2 and the controlled device microprocessor of U41 of voltage sample part 4 or similar functions device control, and its steering logic sequential logic as shown in Figure 7.
As shown in Figure 6 and Figure 7, transformer isolation of the present invention detects the method for DC voltage, comprises step:
The DC load that the secondary connection of A1, transformer is detected;
The elementary connection constant current source of A2, transformer, degaussing circuit and sample circuit;
A3, according to the armature winding Injection Current of certain logical sequence to transformer, the voltage of armature winding is sampled and demagnetization is carried out to transformer;
A4, voltage according to the relation determination DC load of primary winding and secondary winding.
According to a particular embodiment of the invention, constant current source, degaussing circuit and sample circuit are respectively provided with on-off element to realize logical sequence.
Transformer isolation detects that DC voltage contains transformer portion 1, transformer demagnetization part 2, constant current source part 3, voltage sample part 4 form; Tested direct current signal is battery 5.
Transformer portion 1 is made up of an a transformer T1 and diode D1.This partial circuit ensures that transformer portion 1 and tested direct current signal form the electric current of loop inner can only the positive pole of unidirectional injection DC load.Constant current source part 3 is made up of a constant current source I1 and its gauge tap K1.Whether this partial circuit 3 controls constant current source I1 to transformer portion 1 Injection Current I1 by its gauge tap K1.Transformer demagnetization part 2 is made up of a dissipative cell R1 (resistance or other similar dissipative cells) and gauge tap K2.This partial circuit controls by K3 the Np winding whether dissipative cell R1 accesses transformer portion 1 transformer T1, is transformer T1 demagnetization.Voltage sample part 4 keeps (the sampling retaining part of analog/digital converter inside or other similar circuit) by sampling.This partial circuit 4 is being controlled in special time period Ts, the Np winding side voltage of sampling transformer portion 1 transformer T1.
When K1 is high level, constant current source part 2 is to transformer portion 1 Injection Current I1; When K1 is low level, constant current source part 2 stops to transformer portion 1 Injection Current.When K2 is high level, transformer demagnetization part 3 accesses the T1 of transformer portion 1, carries out demagnetization; When K2 is low level, transformer demagnetization part 3 does not access the T1 of transformer portion 1; When K2 is dash area, transformer demagnetization part 3 can be accessed by transformer portion 1, also can not access transformer portion 1.When Ts is high level, voltage sample part 4 is sampled the Np winding side voltage of transformer portion 1 transformer T1, namely tested direct-flow signal voltage value now can be detected; When Ts is low level, voltage sample part 4 can not sample detecting to tested direct-flow signal voltage value.According to logical sequence illustrated in Figure 7, voltage sample part 4 is that high level can detect tested direct-flow signal voltage value at Ts.
Those skilled in the art do not depart from essence of the present invention and spirit, various deformation scheme can be had to realize the present invention, the foregoing is only the better feasible embodiment of the present invention, not thereby interest field of the present invention is limited to, the equivalent structure change that all utilizations instructions of the present invention and accompanying drawing content are done, is all contained within interest field of the present invention.
Claims (10)
1. the device of a transformer isolation detection DC voltage, it is characterized in that: comprise transformer, the elementary connection constant current source module of described transformer, demagnetization module and sampling module, the secondary connection DC load of described transformer, described constant current source module is used for regularly stable to the elementary injection of described transformer electric current, described demagnetization module is used for timing and carries out demagnetization to described transformer, described sampling module, for detecting described primary winding voltage, determines the voltage of described DC load according to the relation of described primary winding and secondary winding.
2. transformer isolation according to claim 1 detects the device of DC voltage, it is characterized in that: described demagnetization module comprises on-off element and the dissipative cell of series connection.
3. transformer isolation according to claim 1 detects the device of DC voltage, it is characterized in that: described constant current source module comprises voltage comparator, the output terminal of described voltage comparator connects field effect transistor, the input end of described voltage comparator connects voltage divider resistors, described voltage divider resistors connecting valve element.
4. transformer isolation according to claim 1 detects the device of DC voltage, it is characterized in that: described sampling module comprises voltage table.
5. transformer isolation according to claim 1 detects the device of DC voltage, it is characterized in that: described sampling module comprises modulus switching device.
6. transformer isolation according to claim 1 detects the device of DC voltage, it is characterized in that: described DC load comprises battery, is provided with one-way conduction element between described transformer and described battery.
7. transformer isolation according to claim 6 detects the device of DC voltage, it is characterized in that: described one-way conduction element is set to diode.
8. transformer isolation detects a method for DC voltage, it is characterized in that, comprises step:
The DC load that the secondary connection of A1, transformer is detected;
The elementary connection constant current source of A2, described transformer, degaussing circuit and sample circuit;
A3, according to the armature winding Injection Current of certain logical sequence to described transformer, the voltage of described armature winding is sampled and demagnetization is carried out to described transformer;
A4, determine the voltage of described DC load according to the relation of described primary winding and secondary winding.
9. transformer isolation according to claim 8 detects the method for DC voltage, it is characterized in that: described constant current source, described degaussing circuit and described sample circuit are respectively provided with on-off element to realize described logical sequence.
10. transformer isolation according to claim 8 detects the method for DC voltage, it is characterized in that: described DC load is set to battery.
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| CN201410758855.0A CN104535817A (en) | 2014-12-10 | 2014-12-10 | Transformer isolation direct current voltage detecting device and method |
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| CN201410758855.0A CN104535817A (en) | 2014-12-10 | 2014-12-10 | Transformer isolation direct current voltage detecting device and method |
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Citations (6)
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|---|---|---|---|---|
| JPH09236624A (en) * | 1996-02-29 | 1997-09-09 | Matsushita Electric Ind Co Ltd | Insulation type voltage measuring apparatus |
| CN201562001U (en) * | 2009-09-18 | 2010-08-25 | 哈尔滨九洲电气股份有限公司 | Direct current bus voltage sampler of intermediate-voltage transducer |
| CN102292717A (en) * | 2007-10-30 | 2011-12-21 | 大动力公司 | An isolated current to voltage, voltage to voltage converter |
| CN202634284U (en) * | 2012-06-18 | 2012-12-26 | 深圳市明微电子股份有限公司 | Switching power supply and constant-current control circuit thereof |
| JP2013153578A (en) * | 2012-01-25 | 2013-08-08 | Fuji Electric Co Ltd | Dc constant voltage power supply device and charging device |
| CN102288916B (en) * | 2007-03-13 | 2014-09-10 | 凌特公司 | Method and apparatus for measuring the voltage of a power source |
-
2014
- 2014-12-10 CN CN201410758855.0A patent/CN104535817A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09236624A (en) * | 1996-02-29 | 1997-09-09 | Matsushita Electric Ind Co Ltd | Insulation type voltage measuring apparatus |
| CN102288916B (en) * | 2007-03-13 | 2014-09-10 | 凌特公司 | Method and apparatus for measuring the voltage of a power source |
| CN102292717A (en) * | 2007-10-30 | 2011-12-21 | 大动力公司 | An isolated current to voltage, voltage to voltage converter |
| CN201562001U (en) * | 2009-09-18 | 2010-08-25 | 哈尔滨九洲电气股份有限公司 | Direct current bus voltage sampler of intermediate-voltage transducer |
| JP2013153578A (en) * | 2012-01-25 | 2013-08-08 | Fuji Electric Co Ltd | Dc constant voltage power supply device and charging device |
| CN202634284U (en) * | 2012-06-18 | 2012-12-26 | 深圳市明微电子股份有限公司 | Switching power supply and constant-current control circuit thereof |
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Effective date of registration: 20160111 Address after: 523577, No. 115, No. four, No. seven, Zhangcha Road, Chancheng District, Guangdong, Foshan Province, China, two to the third floor Applicant after: Foshan Burke New Energy Technology Co.,Ltd. Address before: 523500 Guangdong city in Dongguan Province town of Tangxia City Keyuan Information Industry Park Applicant before: LEKE TECHNOLOGY CO., LTD. |
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Application publication date: 20150422 |
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