CN211453761U - Direct current bus voltage becomes transmission circuit - Google Patents
Direct current bus voltage becomes transmission circuit Download PDFInfo
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- CN211453761U CN211453761U CN201922344402.4U CN201922344402U CN211453761U CN 211453761 U CN211453761 U CN 211453761U CN 201922344402 U CN201922344402 U CN 201922344402U CN 211453761 U CN211453761 U CN 211453761U
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Abstract
The utility model discloses a direct current bus voltage transmission circuit, including voltage attenuation circuit, CPLD square wave generating circuit, integral generation triangle wave circuit, comparison generation pulse circuit, level shift circuit and electricity/light conversion circuit; the voltage attenuation circuit converts the bus voltage into a small signal a, the integration generation triangular wave circuit forms a triangular wave signal b, the comparison generation pulse circuit outputs a pulse signal c which is at a fixed frequency and has a duty ratio related to the direct-current bus voltage U0 by comparing the signals a and b, and the pulse signal c is converted into an optical signal through the processing of the level conversion circuit and the electric/optical conversion circuit to be transmitted in an isolation mode. The utility model discloses a direct current bus voltage becomes transmission circuit, the fungible passes through the mode of coding communication feedback real-time voltage, has solved the problem that detection speed is low, has realized that high voltage signal is to low voltage signal's conversion and isolation conveying, can realize accurate, the short-term test of control system to bus voltage.
Description
Technical Field
The utility model relates to a direct current bus voltage becomes transmission circuit, more specifically says so, especially relates to an adopt hardware circuit to replace the direct current bus voltage that the communication of coding acquireed generating line real-time voltage to become transmission circuit.
Background
In the current power electronic transformer, the dc voltage of the power modules of multiple levels isolated by the high-frequency transformer needs to be detected in real time, so that the inverter voltage output of each parallel module can be unified conveniently. In the prior art, real-time voltage is fed back in a coding communication mode, and the detection speed of the real-time voltage is lower than that of the real-time voltage which is directly detected by a hardware circuit.
Disclosure of Invention
The utility model discloses an overcome above-mentioned technical problem's shortcoming, provide one kind and adopt hardware circuit to replace the coding communication to acquire the direct current bus-bar voltage transmission circuit of generating line real-time voltage.
The utility model discloses a direct current bus voltage transmission circuit, including voltage attenuation circuit, CPLD square wave generating circuit, integral generation triangle wave circuit, comparison generation pulse circuit, level shift circuit and electricity/light conversion circuit; the method is characterized in that: the input end of the voltage attenuation circuit is connected with the direct current bus voltage U0, and the voltage attenuation circuit is used for converting the direct current bus voltage into a direct current small signal a below 3.3V and inputting the direct current small signal a to one input end of the comparison generation pulse circuit; the CPLD square wave generating circuit is used for outputting a square wave signal of a fixed pulse to the integral generation triangular wave circuit, the integral generation triangular wave circuit integrates the input square wave signal to form a triangular wave signal b of a fixed frequency, and the triangular wave signal b is input to the other input end of the comparison generation pulse circuit;
the comparison generation pulse circuit compares the input small signal a with the triangular wave signal b, outputs a pulse signal c with fixed frequency and related to the duty ratio of the direct current bus voltage U0 to the level conversion circuit, the level conversion circuit processes the pulse signal c and inputs the processed pulse signal c to the electric/optical conversion circuit, the electric/optical conversion circuit converts the input electric signal into an optical signal, and the optical signal is isolated and transmitted through an optical fiber.
The utility model discloses a direct current bus voltage becomes transmission circuit, voltage attenuation circuit includes resistance bleeder circuit and difference amplifier circuit, and resistance bleeder circuit carries out voltage to the direct current bus voltage signal U0 of input and equally divides, and difference amplifier circuit further attenuates and finely tunes the voltage signal after dividing, forms the small signal an.
The utility model discloses a direct current bus voltage becomes transmission circuit, CPLD square wave generating circuit adopt integrated chip CPLD to produce the square wave of regulation frequency, and the integral generation triangle wave circuit comprises differential circuit and integral circuit.
The utility model discloses a direct current bus voltage becomes transmission circuit, the comparison generates pulse circuit and adopts the comparator to carry out the comparison to small-signal a and triangular wave signal b and form pulse signal c.
The utility model discloses a direct current bus voltage becomes transmission circuit, level shift circuit adopt pull-up resistance at first to adjust pulse signal c, then add phase inverter adjustment signal direction and reinforcing driving force, make the signal adaptation electric/light converting circuit of level shift circuit output.
The utility model discloses a direct current bus voltage becomes transmission circuit, direct current bus voltage U0's scope is 0 ~ 1100 VDC.
The utility model has the advantages that: the utility model discloses a direct current bus voltage becomes transmission circuit, direct current bus voltage U0 turns into the small signal a below 3.3V after voltage attenuation circuit's processing at first to input to an input that generates pulse circuit comparatively, and the integral generates triangular wave circuit and forms triangular wave signal b after carrying out the integral to the square wave signal of input, and inputs to another input that generates pulse circuit comparatively; the comparison generates pulse circuit through the comparison to signal a and signal b, and output fixed frequency, duty ratio and the relevant pulse signal c of direct current bus voltage U0, and signal c turns into the light signal through optic fibre conveying after level conversion circuit, electricity/light conversion circuit's processing, has finally realized keeping apart to uploading bus voltage U0's transmission, the utility model discloses a direct current bus voltage transmission circuit, the fungible passes through the mode of coded communication feedback real-time voltage, has solved the problem that detection speed is low, has realized high voltage signal to low-voltage signal's conversion and isolation transmission, can realize control system to bus voltage's accuracy, short-term test.
Drawings
Fig. 1 is a schematic diagram of a dc bus voltage transmission circuit according to the present invention.
In the figure: the circuit comprises a 1 voltage attenuation circuit, a 2 CPLD square wave generation circuit, a 3 integration generation triangular wave circuit, a 4 comparison generation pulse circuit, a 5 level conversion circuit and a 6 electric/optical conversion circuit.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
As shown in fig. 1, the schematic diagram of the dc bus voltage transmission circuit of the present invention is provided, which is composed of a voltage attenuation circuit 1, a CPLD square wave generating circuit 2, an integral generation triangular wave circuit 3, a comparison generation pulse circuit 4, a level conversion circuit 5 and an electric/optical conversion circuit 6, wherein the input end of the voltage attenuation circuit 1 is connected to the dc voltage bus, and the output end is connected to one input end of the comparison generation pulse circuit 4. The output end of the CPLD square wave generating circuit 2 is connected with the input end of the integral generation triangular wave circuit 3, the output end of the integral generation triangular wave circuit 3 is connected with the other input end of the comparison generation pulse circuit 4, the output end of the comparison generation pulse circuit 4 is connected with the input end of the level conversion circuit 5, and the output end of the level conversion circuit 5 is connected with the input end of the electric/optical conversion circuit 6.
The dc bus voltage U0 (ranging from 0 to 1100 VDC) is connected to the input terminal of the voltage attenuation circuit 1, and the voltage attenuation circuit 1 converts the bus voltage U0 into a dc small signal a of 3.3V or less and inputs the dc small signal a to one input terminal of the comparison pulse generation circuit 4. The CPLD generates a square wave signal formed by the square wave circuit 2 and inputs the square wave signal to the input end of the integral generation triangular wave circuit 3, and the integral generation triangular wave circuit 3 integrates the input square wave signal to generate a standard triangular wave signal b with fixed frequency and inputs the standard triangular wave signal b to the other input end of the comparison generation pulse circuit 4. The comparison generation pulse circuit 4 compares the input small signal a with the input triangular wave signal b, outputs a pulse signal c with a fixed frequency and a duty ratio related to the direct current bus voltage U0 to the level conversion circuit, the level conversion circuit processes the pulse signal c and inputs the processed pulse signal c to the electric/optical conversion circuit, the electric/optical conversion circuit converts the input electric signal into an optical signal, and the optical signal is transmitted in an isolated mode through an optical fiber.
The CPLD generated square wave circuit 2 combines the hardware requirements of the control circuit board of the solid-state transformer, adopts the CPLD of an integrated chip, and is formed by sending square waves with fixed frequency under the control of a programmed software program. The integration generation triangular wave circuit 3 is realized by combining a differential circuit with a rheostat and an integration circuit, so that corresponding parameters are adjusted to enable the amplitude/zero drift and the like of the generated triangular wave signal b to meet requirements and be matched with the signal a.
The comparison pulse generation circuit 4 compares the direct current signal a and the triangular wave signal b by using a comparator to form a pulse signal c with a fixed frequency and a pulse width related to the small signal a. The level conversion circuit 5 adopts a pull-up resistor to adjust the signal after the signals a and b are compared, and adds an inverter to adjust the signal direction and enhance the driving capability so as to adapt to a subsequent photoelectric conversion device and ensure that the signal is more reliable. And 6, an electric/optical conversion circuit 6 converts the level signal into an optical signal by adopting an optical fiber launching seat and transmits the optical signal through an optical fiber, and the control system side determines the voltage value through photoelectric conversion and pulse width analysis, thereby finally realizing the isolated transmission of the DC bus voltage of 0-1100V.
The utility model discloses a direct current bus voltage becomes transmission circuit can attenuate, convert, keep apart the transmission 0-1100VDC bus voltage signal in real time. The bus voltage is converted into pulse signals with different duty ratios, and the pulse signals are transmitted after photoelectric conversion, so that the low-voltage control system can isolate the high-voltage direct-current bus detection.
Claims (6)
1. A direct current bus voltage transmission circuit comprises a voltage attenuation circuit (1), a CPLD square wave generation circuit (2), an integral generation triangular wave circuit (3), a comparison generation pulse circuit (4), a level conversion circuit (5) and an electric/optical conversion circuit; the method is characterized in that: the input end of the voltage attenuation circuit is connected with the direct current bus voltage U0, and the voltage attenuation circuit is used for converting the direct current bus voltage into a direct current small signal a below 3.3V and inputting the direct current small signal a to one input end of the comparison generation pulse circuit; the CPLD square wave generating circuit is used for outputting a square wave signal of a fixed pulse to the integral generation triangular wave circuit, the integral generation triangular wave circuit integrates the input square wave signal to form a triangular wave signal b of a fixed frequency, and the triangular wave signal b is input to the other input end of the comparison generation pulse circuit;
the comparison generation pulse circuit compares the input small signal a with the triangular wave signal b, outputs a pulse signal c with fixed frequency and related to the duty ratio of the direct current bus voltage U0 to the level conversion circuit, the level conversion circuit processes the pulse signal c and inputs the processed pulse signal c to the electric/optical conversion circuit, the electric/optical conversion circuit converts the input electric signal into an optical signal, and the optical signal is isolated and transmitted through an optical fiber.
2. The direct current bus voltage transmission circuit according to claim 1, characterized in that: the voltage attenuation circuit (1) comprises a resistance voltage division circuit and a differential amplification circuit, the resistance voltage division circuit performs voltage equalization on an input direct current bus voltage signal U0, and the differential amplification circuit performs further attenuation and fine adjustment on the divided voltage signal to form a small signal a.
3. The direct current bus voltage transmission circuit according to claim 1 or 2, characterized in that: the CPLD square wave generating circuit (2) adopts an integrated chip CPLD to generate square waves with specified frequency, and the integral generation triangular wave circuit (3) consists of a differential circuit and an integral circuit.
4. The direct current bus voltage transmission circuit according to claim 1 or 2, characterized in that: the comparison generation pulse circuit (4) adopts a comparator to compare the small signal a with the triangular wave signal b to form a pulse signal c.
5. The direct current bus voltage transmission circuit according to claim 1 or 2, characterized in that: the level conversion circuit (5) firstly adopts a pull-up resistor to adjust the pulse signal c, and then adds an inverter to adjust the signal direction and enhance the driving capability so that the signal output by the level conversion circuit is suitable for the electric/optical conversion circuit (6).
6. The direct current bus voltage transmission circuit according to claim 1 or 2, characterized in that: the range of the direct current bus voltage U0 is 0-1100 VDC.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922344402.4U CN211453761U (en) | 2019-12-24 | 2019-12-24 | Direct current bus voltage becomes transmission circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922344402.4U CN211453761U (en) | 2019-12-24 | 2019-12-24 | Direct current bus voltage becomes transmission circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462258A (en) * | 2020-11-06 | 2021-03-09 | 珠海格力电器股份有限公司 | Motor terminal voltage detection method, device and circuit and air conditioning system |
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2019
- 2019-12-24 CN CN201922344402.4U patent/CN211453761U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462258A (en) * | 2020-11-06 | 2021-03-09 | 珠海格力电器股份有限公司 | Motor terminal voltage detection method, device and circuit and air conditioning system |
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