CN207625279U - A kind of detection of DC bus-bar voltage and protection circuit - Google Patents
A kind of detection of DC bus-bar voltage and protection circuit Download PDFInfo
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- CN207625279U CN207625279U CN201721797464.5U CN201721797464U CN207625279U CN 207625279 U CN207625279 U CN 207625279U CN 201721797464 U CN201721797464 U CN 201721797464U CN 207625279 U CN207625279 U CN 207625279U
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Abstract
The utility model discloses a kind of detections of DC bus-bar voltage and protection circuit; series connection accesses at least two resistance between being included in DC bus positive and negative anodes to be measured; the resistance wherein being connect with DC bus negative pole end is sampling resistor; remaining resistance is divider resistance, and the both ends output of sampling resistor measures voltage VDCM；It measures voltage and connects filter circuit, filter circuit connects an analog isolation chip, and analog isolation chip connects differential amplification and conversion circuit；The wherein analog signal of the output multiple gain of analog isolation chip or unit gain；The differential amplification and conversion circuit output signal are directly connected to controller or modulus conversion chip.Solve that existing DC bus-bar voltage detection scheme is of high cost, error and the larger problem that is delayed.
Description
Technical field
The utility model belongs to power electronics field, is related to detection and the protection circuit of a kind of DC bus-bar voltage.
Background technology
Power electronic product such as inverter, current transformer, motor driving, frequency converter etc., it usually needs detection DC bus electricity
Pressure, voltage signal feeds back to control unit, for specific voltage value and situation of change, needs to do accordingly the control of output
Adjustment.Meanwhile accurate voltage sample is also required to realize for the protection of voltage.
For the forceful electric power voltage detecting of AC or DC, voltage transformer, the standards such as voltage hall sensor are generally taken
Device, selects according to voltage and output type, and it is input, internal auxiliary power supply transformer list also to take with DC bus
Only winding output voltage does detection scheme, winding output voltage is designed as being associated with input voltage, then the amplitude for passing through voltage
Transformation obtains final detection voltage.
Utility model content
The utility model provides detection and the protection circuit of a kind of DC bus-bar voltage；Solves existing DC bus
Voltage detection scheme is of high cost, error and the larger problem that is delayed.
The technical solution of the utility model is：A kind of detection of DC bus-bar voltage and protection circuit are included in be measured straight
Series connection accesses at least two resistance between flowing busbar positive and negative anodes, wherein the resistance being connect with DC bus negative pole end is sampling electricity
Resistance, remaining resistance is divider resistance, and the both ends output of sampling resistor measures voltage；It measures voltage and connects filter circuit, filtering
Circuit connects an analog isolation chip, and analog isolation chip connects differential amplification and conversion circuit；Wherein analog isolation chip
Export the analog signal of multiple gain or unit gain；The differential amplification and conversion circuit output signal are directly connected to control
Device or modulus conversion chip.
Further, the utility model is also characterized by：
Wherein divider resistance has multiple, and sampling resistor is 1.
Wherein analog isolation chip is the isolating chip with analog-to-digital conversion.
Wherein analog isolation chip is ACPL-790X or ACPL-C87X.
Wherein differential signal amplification and conversion circuit include integrated transporting discharging chip and four resistance.
Wherein differential signal amplification and conversion circuit further include two capacitances for being filtered to output signal.
The wherein output signal of differential signal amplification and conversion circuit is directly connected to comparator.
Compared with prior art, the utility model has the beneficial effects that：For different voltage samples, difference can be related to
The divider resistance and its resistance value of quantity, and the cost outside will not increasing；Sampling resistor is designed according to the voltage value of sampling, production
Raw loss is small；Analog isolation chip disclosure satisfy that the demand of isolation, while have preferable dynamic response performance；The difference of output
The voltage magnitude for dividing amplification and conversion circuit that can flexibly adjust output, obtains required voltage range.
Further, divider resistance setting is multiple, can avoid because divider resistance quantity is very few and therefore voltage mistake
It carries, to cause voltage to puncture divider resistance.
Further, the analog isolation chip with analog-to-digital conversion, output are digital signal, be disclosure satisfy that more capable and experienced
The demand used in the environment of disturbing, and longer distance can be transmitted, in use, being not easy in large-scale product or equipment
Interference is received, to lead to sample failure or influence precision.
Further, ACPL-790X or ACPL-C87X chips disclosure satisfy that the demand and sampled signal of isolation
Gain requirements.
Further, by increasing capacitance, output signal is filtered；It is directly accessed comparator chip simultaneously, and
It is the saltus step that comparator generates output voltage, to realize under certain input voltage and by the threshold value of design comparison device
Over-pressed either under-voltage this protection mechanism of defencive function requires no controller or modulus conversion chip, thus it is corresponding more
Soon, it protects more timely.
Description of the drawings
Fig. 1 is the circuit structure diagram of the utility model；
Fig. 2 is another structure chart of differential amplifier circuit in the utility model.
In figure：R is resistance, and C is capacitance；U1 is analog isolation chip；U2 is integrated transporting discharging chip.
Specific implementation mode
The technical solution of the utility model is further illustrated in the following with reference to the drawings and specific embodiments.
The utility model provides detection and the protection circuit of a kind of DC bus-bar voltage, as shown in Figure 1, including being connected to
Divider resistance between frequency changer direct current bus positive and negative anodes and sampling resistor, divider resistance and sampling resistor are to be arranged in series；Its
One end of middle sampling resistor is connect with DC bus cathode, and the other end connects divider resistance；Therefore it is exported using the both ends of resistance
Measure voltage VDCM；The measurement voltage of output is connect with filter circuit, and filter circuit connects an isolation operational amplification circuit, every
A calculus of differences amplification and conversion circuit are connected from operational amplification circuit；Calculus of differences amplifies and conversion circuit connects controller
Or modulus conversion chip.
Preferably, divider resistance is multiple, and as shown in Figure 1, divider resistance is concatenated n resistance, sampling resistor is
One resistance RM, and the cathode of one end connection DC bus of sampling resistor, the other end connect divider resistance, therefore sampling resistor
The measurement voltage VDCM, and voltage VDC and VDCM between DC bus positive and negative anodes of both ends output, between relationship be：
It measures voltage VDCM and is input to analog isolation chip U1 by the filter circuit of resistance RL and capacitance CL compositions, wherein
The value of resistance RL and capacitance CL need the dynamic response according to the size of measurement voltage, interference strength and needs to design, and
And meet the demand；The measurement voltage signal of input is exported the mould of certain amplitude by analog isolation chip U1 by isolated variable
Quasi- signal, according to the difference of chip type, gain or unit gain of the U1 outputs of analog isolation chip with certain multiple.It is excellent
The analog isolation chip U1 of choosing selects ACPL-790X or ACPL-C87X.
Wherein analog isolation chip U1 outputs are differential signal VD, therefore connect a differential amplification and conversion circuit, should
Circuit includes four resistance R1-R4 and integrated transporting discharging chip U2, differential amplification as shown in the figures 1 and 2 and conversion circuit, wherein electricity
R1=R3, R2=R4 are hindered, the output of differential amplification and conversion circuit is as follows for the relationship of VO, wherein VD and VO；
Wherein the resistance value of R1-R4 can be according to the range of sampled voltage and the model of controller acceptable analog signal
It encloses to design.When that need not amplify, four resistance use identical resistance value, and the voltage signal VO of final output can be straight
Output is connect to controller or modulus conversion chip, completes the control function of sampling.
Preferably, analog isolation chip U1 selects to be the isolating chip with analog-to-digital conversion, and therefore, output is number
Signal disclosure satisfy that compared with the use demand under strong interference environment, and can transmit longer distance, in relatively large product
Or be not readily susceptible to interfere when using in equipment, cause to be affected using failure or precision.
Differential amplification and conversion circuit can also be transformed to circuit as shown in Figure 2, in figure at resistance R4 and resistance R2
Capacitance C2 and capacitance C1 are increased separately, for meeting the filtering requirements to output signal.Therefore, in the differential amplification and conversion electricity
Road is directly accessed comparator chip, and according to the design of comparator chip threshold value, under certain input voltage, makes to compare
Device chip generates the saltus step of output voltage, and to realize overvoltage or under-voltage defencive function, this protection is because without control
The A/D of device is converted, to it is corresponding faster, protection it is more timely.
In the utility model, differential amplification as shown in Figure 1 and conversion circuit can be directly connected to converter or modulus
Conversion chip；Differential amplification and conversion circuit as shown in Figure 2 can be directly connected to converter, modulus conversion chip or comparator
Chip.
Claims (7)
1. the detection of DC bus-bar voltage a kind of and protection circuit, which is characterized in that be included in DC bus positive and negative anodes to be measured it
Between series connection access at least two resistance, wherein resistance connect with DC bus negative pole end be sampling resistor, remaining resistance be divide
Piezoresistance, and the both ends output of sampling resistor measures voltage；It measures voltage and connects filter circuit, filter circuit connects a simulation
Isolating chip, analog isolation chip connect differential amplification and conversion circuit；
The analog signal of the analog isolation chip output multiple gain or unit gain；The differential amplification and conversion circuit
Output signal is directly connected to controller or modulus conversion chip.
2. detection and the protection circuit of DC bus-bar voltage according to claim 1, which is characterized in that the divider resistance
Have it is multiple, sampling resistor be 1.
3. detection and the protection circuit of DC bus-bar voltage according to claim 1, which is characterized in that the analog isolation
Chip is the isolating chip with analog-to-digital conversion.
4. detection and the protection circuit of DC bus-bar voltage according to claim 1, which is characterized in that the analog isolation
Chip is ACPL-790X or ACPL-C87X.
5. the detection of DC bus-bar voltage and protection circuit according to any one of claims 1-4, which is characterized in that institute
It includes integrated transporting discharging chip and four resistance to state differential amplification and conversion circuit.
6. detection and the protection circuit of DC bus-bar voltage according to claim 5, which is characterized in that the differential amplification
And conversion circuit further includes two capacitances for being filtered to output signal.
7. detection and the protection circuit of DC bus-bar voltage according to claim 6, which is characterized in that the differential amplification
And the output signal of conversion circuit is directly connected to comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721797464.5U CN207625279U (en) | 2017-12-20 | 2017-12-20 | A kind of detection of DC bus-bar voltage and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721797464.5U CN207625279U (en) | 2017-12-20 | 2017-12-20 | A kind of detection of DC bus-bar voltage and protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207625279U true CN207625279U (en) | 2018-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721797464.5U Active CN207625279U (en) | 2017-12-20 | 2017-12-20 | A kind of detection of DC bus-bar voltage and protection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450314A (en) * | 2018-12-12 | 2019-03-08 | 许昌学院 | A kind of doubly-fed generation machine control system |
| CN109818331A (en) * | 2019-01-30 | 2019-05-28 | 许继电源有限公司 | A kind of accessory power supply overvoltage crowbar |
| CN112453665A (en) * | 2020-12-22 | 2021-03-09 | 无锡马斯克焊割设备有限公司 | Plasma arc detection method applied to plasma cutting machine |
| CN113156185A (en) * | 2021-03-30 | 2021-07-23 | 中国南方电网有限责任公司超高压输电公司梧州局 | DC bus voltage monitoring system |
-
2017
- 2017-12-20 CN CN201721797464.5U patent/CN207625279U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450314A (en) * | 2018-12-12 | 2019-03-08 | 许昌学院 | A kind of doubly-fed generation machine control system |
| CN109818331A (en) * | 2019-01-30 | 2019-05-28 | 许继电源有限公司 | A kind of accessory power supply overvoltage crowbar |
| CN112453665A (en) * | 2020-12-22 | 2021-03-09 | 无锡马斯克焊割设备有限公司 | Plasma arc detection method applied to plasma cutting machine |
| CN113156185A (en) * | 2021-03-30 | 2021-07-23 | 中国南方电网有限责任公司超高压输电公司梧州局 | DC bus voltage monitoring system |
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