CN209497391U - A kind of DC voltage isolation conversion circuit - Google Patents
A kind of DC voltage isolation conversion circuit Download PDFInfo
- Publication number
- CN209497391U CN209497391U CN201920370899.4U CN201920370899U CN209497391U CN 209497391 U CN209497391 U CN 209497391U CN 201920370899 U CN201920370899 U CN 201920370899U CN 209497391 U CN209497391 U CN 209497391U
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- China
- Prior art keywords
- voltage
- operational amplifier
- conversion circuit
- grade
- divider resistance
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Abstract
The utility model discloses a kind of DC voltages, and conversion circuit is isolated, and is made of divider resistance, operational amplifier, current-limiting resistance, coupled capacitor, filter resistance, filter capacitor and precision photoelectric coupler.DC bus-bar voltage passes through divider resistance; higher voltage is converted into lesser voltage signal; operational amplifier is acquired voltage signal, amplifies; it is transmitted to precision photoelectric coupler input terminal; the linearity of precision photoelectric coupler is up to 0.01%; the voltage signal numerical value of the voltage signal and output that guarantee input is essentially identical, and the voltage signal of output is transmitted to the A/D conversion module of DSP after operational amplifier and finally realizes the over-voltage protecting function of DC voltage.DC voltage acquisition precision using the intermediate frequency square wave frequency converter of the utility model DC voltage isolation conversion circuit is high, has the good linearity, the DC over-voltage protection function of intermediate frequency square wave frequency converter is normal.
Description
Technical field
The utility model belongs to intermediate frequency square wave Frequency Converter Control field, and in particular to a kind of DC voltage isolation conversion electricity
Road.
Background technique
For intermediate frequency square wave frequency converter, in order to improve the reliability and stability of intermediate frequency square wave frequency converter, usually need
Have various defencive functions, DC over-voltage protection function is one of various defencive functions.It is generally necessary to use low-voltage
Signal goes control high voltage analog quantity, it is therefore desirable to which conversion circuit is isolated in voltage.Otherwise, high voltage is easy to seal in low-voltage device
Part, and burnt, isolation conversion circuit is a kind of common electronic circuit, can be to avoid because missing brought by grounding point difference
Difference.
On the other hand, because power device has a higher switching frequency, there are larger inside intermediate frequency square wave frequency converter
Electromagnetic interference phenomenon, make intermediate frequency square wave frequency converter control system exist can not normal acquisition DC voltage a possibility that, seriously
When will lead to DC over-voltage protection disabler, exist damage intermediate frequency square wave frequency converter hidden danger.Therefore, with isolation features
DC voltage Acquisition Circuit is particularly significant for intermediate frequency square wave frequency converter.
The size of intermediate frequency square wave frequency converter output three-phase alternating voltage is determined by DC voltage, therefore DC voltage can be real-time
Variation, it is desirable that on the one hand DC voltage Acquisition Circuit has the good linearity, on the other hand require DC voltage Acquisition Circuit
With isolation features, the accuracy that prevents the electromagnetic interference influence DC voltage inside intermediate frequency square wave frequency converter from acquiring.Previous tool
The intermediate frequency square wave frequency converter of standby DC voltage acquisition function, the mode for generalling use direct current voltage sensor acquire DC voltage.
The mode of this tradition acquisition DC voltage, on the one hand increases the cost of intermediate frequency square wave frequency converter, on the other hand increases line
Complexity, undoubtedly increase the difficulty of maintenance and repair.
Utility model content
The utility model be in order to overcome it is existing by direct current voltage sensor acquire DC voltage in a manner of lead to intermediate frequency side
Wave frequency converter cost improve, increase line complexity and maintenance and repair difficulty the shortcomings that and propose, the purpose is to provide
A kind of DC voltage isolation conversion circuit.
The technical solution of the utility model is:
A kind of DC voltage isolation conversion circuit, including I ~ No. Ⅸ divider resistance being successively linked in sequence, No. I divider resistance
Other end pin connect DC voltage electrode, the other end pin of No. Ⅸ divider resistance is separately connected No. Ⅹ divider resistance and Ⅺ
The other end pin of number divider resistance, No. Ⅺ divider resistance connects DC voltage cathode by No. Ⅻ divider resistance,
The positive input of I grade of operational amplifier connects No. Ⅹ divider resistance other end pin, and reverse input end passes through I
Number operational amplifier build-out resistor connects its output end, and the output end of No. I operational amplifier build-out resistor is directly connected to II all the way
Grade operational amplifier positive input, another way connect II, No. III operational amplifier build-out resistor after connection II grade of operation put
The reverse input end of big device；
Parallel coupled capacitor between the reverse input end and output end of II grade of operational amplifier, II grade of operational amplifier it is defeated
Outlet connects No. 2 pins of precision photoelectric coupler, No. 5 pins connection III of precision photoelectric coupler by No. I current-limiting resistance
Grade operational amplifier positive input, and the positive input of No. 5 and III grade operational amplifiers of precision photoelectric coupler it
Between parallel filtering circuit, connected between the negative input and output end of III grade of operational amplifier, III grade of operational amplifier it is defeated
Outlet connects the analog-to-digital conversion module of DSP by No. II current-limiting resistance.
One end pin of described II, No. III operational amplifier build-out resistor is connect with DC voltage cathode.
No. 1 pin of the precision photoelectric coupler and No. 4 pins connect DC voltage cathode.
No. 7 pins of the precision photoelectric coupler and No. 8 pins are empty foot.
No. 3 pins of the precision photoelectric coupler connect power vd D5.
No. 6 pins of the precision photoelectric coupler connect power supply VCC5.
The filter circuit is made of the filter circuit and filter capacitor being serially connected.
One end of the filter circuit and filter capacitor is connect with GND.
The beneficial effects of the utility model are:
The utility model provides a kind of DC voltage isolation conversion circuit, using in DC voltage isolation conversion circuit
The DC voltage acquisition precision of frequency square wave frequency converter is high, has the good linearity, and the DC over-voltage of intermediate frequency square wave frequency converter is protected
Protective function is normal.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of DC voltage isolation conversion circuit of the utility model.
Wherein:
1 No. I divider resistances, 2 No. II divider resistances
3 No. III divider resistances, 4 No. VI divider resistances
5 No. V divider resistances, 6 No. VI divider resistances
7 No. VII divider resistances, 8 No. VIII divider resistances
9 No. Ⅸ divider resistances, 10 No. Ⅹ divider resistances
11 No. Ⅺ divider resistances, 12 No. Ⅻ divider resistances
13 No. I operational amplifier build-out resistors, 14 No. II operational amplifier build-out resistors
15 No. III operational amplifier build-out resistors, 16 I grades of operational amplifiers
17 II grades of operational amplifiers, 18 III grades of operational amplifiers
19 No. I current-limiting resistances, 20 No. II current-limiting resistances
21 coupled capacitor, 22 precision photoelectric coupler
23 filter circuit, 24 filter capacitor
25 DC voltage electrode, 26 DC voltage cathode.
Specific embodiment
With reference to the accompanying drawings of the specification and embodiment carries out in detail a kind of DC voltage of the utility model isolation conversion circuit
It describes in detail bright:
As shown in Figure 1, conversion circuit is isolated in a kind of DC voltage, including be successively linked in sequence I ~ No. Ⅸ divider resistance 1 ~
9, the other end pin of No. I divider resistance 1 connects DC voltage electrode 25, and the other end pin of No. Ⅸ divider resistance 9 connects respectively
No. Ⅹ divider resistance 10 and No. Ⅺ divider resistance 11 are connect, the other end pin of No. Ⅺ divider resistance 11 passes through No. Ⅻ divider resistance 12
DC voltage cathode 26 is connected,
The positive input of I grade of operational amplifier 16 connects No. Ⅹ 10 other end pin of divider resistance, reverse input end
Its output end is connected by No. I operational amplifier build-out resistor 13, the output end of No. I operational amplifier build-out resistor 13 is straight all the way
The positive input of II grade of operational amplifier 17 is connect in succession, and another way is connected after II, No. III operational amplifier build-out resistor 14/15
Connect the reverse input end of II grade of operational amplifier 17；
Parallel coupled capacitor 21 between the reverse input end and output end of II grade of operational amplifier 17, II grade of operational amplifier
17 output end connects No. 2 pins of precision photoelectric coupler 22 by No. I current-limiting resistance 19, and the 5 of precision photoelectric coupler 22
Number pin connects the positive input of III grade of operational amplifier 18, and No. 5 and III grade of operation amplifier of precision photoelectric coupler 22
Parallel filtering circuit between the positive input of device 18 connects between the negative input and output end of III grade of operational amplifier 18
It connects, the output end of III grade of operational amplifier 18 connects the analog-to-digital conversion module of DSP by No. II current-limiting resistance 20.
One end pin of described II, No. III operational amplifier build-out resistor 14/15 is connect with DC voltage cathode 26.
No. 1 pin of the precision photoelectric coupler 22 and No. 4 pins connect DC voltage cathode 26.
No. 7 pins of the precision photoelectric coupler 22 and No. 8 pins are empty foot.
No. 3 pins of the precision photoelectric coupler 22 connect power vd D5.
No. 6 pins of the precision photoelectric coupler 22 connect power supply VCC5.
The filter circuit is made of the filter circuit 23 and filter capacitor 24 being serially connected.
One end of the filter circuit 23 and filter capacitor 24 is connect with GND.
A kind of DC voltage isolation conversion circuit of the utility model is by divider resistance, operational amplifier build-out resistor, operation
Amplifier, coupled capacitor, current-limiting resistance, filter resistance, filter capacitor and precision photoelectric coupler composition.
DC bus-bar voltage passes through divider resistance, and higher voltage (DC voltage of 100V ~ 900V dynamic change) is turned
It is changed to lesser voltage signal (low voltage signal of 0.2V ~ 3.3V), and is transmitted to operational amplifier, operational amplifier is to voltage
Signal is acquired, amplifies, and voltage signal successively after the operational amplifier of two-stage, is transmitted to precision photoelectric coupler input
End guarantees defeated due to the precision photoelectric coupler linearity with higher (linearity of precision photoelectric coupler is up to 0.01%)
The voltage signal numerical value of the output of the voltage signal and precision photoelectric coupler that enter is essentially identical (to be similarly the electricity of 0.2V ~ 3.3V
Press signal), the low voltage signal of precision photoelectric coupler output is transmitted to DSP(digital signal after level-one operational amplifier
Processor) A/D convert (analog-to-digital conversion) module, for the acquisition of DC voltage, and finally realize DC voltage over-voltage protect
Protective function.
When concrete application, the quantity and resistance value of divider resistance can be changed according to the size of DC voltage, as long as protecting
Low voltage signal after card partial pressure is no more than the voltage range that DSP allows, and has good practicability.
DC voltage acquisition precision using the intermediate frequency square wave frequency converter of DC voltage isolation conversion circuit is high, has good
The linearity, the DC over-voltage protection function of intermediate frequency square wave frequency converter is normal.
Claims (8)
1. conversion circuit is isolated in a kind of DC voltage, it is characterised in that: including be successively linked in sequence I ~ No. Ⅸ divider resistance (1 ~
9), the other end pin of No. I divider resistance (1) connects DC voltage electrode (25), the other end pin of No. Ⅸ divider resistance (9)
It is separately connected No. Ⅹ divider resistance (10) and No. Ⅺ divider resistance (11), the other end pin of No. Ⅺ divider resistance (11) passes through Ⅻ
Number divider resistance (12) connection DC voltage cathode (26),
The positive input of I grade of operational amplifier (16) connects No. Ⅹ divider resistance (10) other end pin, reverse input end
Its output end, the output end one of No. I operational amplifier build-out resistor (13) are connected by No. I operational amplifier build-out resistor (13)
Road is directly connected to the positive input of II grade of operational amplifier (17), another way II, No. III operational amplifier build-out resistor of series connection
(14/15) reverse input end of II grade of operational amplifier (17) is connected afterwards；
Parallel coupled capacitor (21) between the reverse input end and output end of II grade of operational amplifier (17), II grade of operational amplifier
(17) No. 2 pins of the output end by No. I current-limiting resistance (19) connection precision photoelectric coupler (22), precision photoelectric coupler
(22) No. 5 pins connect the positive input of III grade of operational amplifier (18), and No. 5 and III of precision photoelectric coupler (22)
Grade operational amplifier (18) positive input between parallel filtering circuit, the negative input of III grade of operational amplifier (18) with
It is connected between output end, the output end of III grade of operational amplifier (18) is turned by the modulus that No. II current-limiting resistance (20) connects DSP
Change the mold block.
2. conversion circuit is isolated in a kind of DC voltage according to claim 1, it is characterised in that: described II, No. III operation
One end pin of amplifier build-out resistor (14/15) is connect with DC voltage cathode (26).
3. conversion circuit is isolated in a kind of DC voltage according to claim 1, it is characterised in that: the linear photoconductor coupling
No. 1 pin of device (22) and No. 4 pin connections DC voltage cathode (26).
4. conversion circuit is isolated in a kind of DC voltage according to claim 1, it is characterised in that: the linear photoconductor coupling
No. 7 pins of device (22) and No. 8 pins are empty foot.
5. conversion circuit is isolated in a kind of DC voltage according to claim 1, it is characterised in that: the linear photoconductor coupling
No. 3 pins of device (22) connect power vd D5.
6. conversion circuit is isolated in a kind of DC voltage according to claim 1, it is characterised in that: the linear photoconductor coupling
No. 6 pins of device (22) connect power supply VCC5.
7. conversion circuit is isolated in a kind of DC voltage according to claim 1, it is characterised in that: the filter circuit is by phase
Mutual concatenated filter circuit (23) and filter capacitor (24) composition.
8. conversion circuit is isolated in a kind of DC voltage according to claim 7, it is characterised in that: the filter circuit (23)
It is connect with GND with one end of filter capacitor (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370899.4U CN209497391U (en) | 2019-03-22 | 2019-03-22 | A kind of DC voltage isolation conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370899.4U CN209497391U (en) | 2019-03-22 | 2019-03-22 | A kind of DC voltage isolation conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209497391U true CN209497391U (en) | 2019-10-15 |
Family
ID=68157392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920370899.4U Expired - Fee Related CN209497391U (en) | 2019-03-22 | 2019-03-22 | A kind of DC voltage isolation conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209497391U (en) |
-
2019
- 2019-03-22 CN CN201920370899.4U patent/CN209497391U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20191015 |