CN206235409U - A kind of multi-module type sample circuit - Google Patents
A kind of multi-module type sample circuit Download PDFInfo
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- CN206235409U CN206235409U CN201621277881.2U CN201621277881U CN206235409U CN 206235409 U CN206235409 U CN 206235409U CN 201621277881 U CN201621277881 U CN 201621277881U CN 206235409 U CN206235409 U CN 206235409U
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Abstract
The utility model discloses a kind of multi-module type sample circuit, it includes drive circuit, sampling control circuit and multiple sampling resistors.Sampling control circuit carries out multimode data sampling for controlling the multiple sampling resistors of drive circuit driving.Drive circuit includes signal gating circuit, voltage-frequency conversion circuit, multiple bleeder circuits.Sampled signal is converted to voltage signal by each sampling resistor by a bleeder circuit.Plurality of voltages signal is by signal gating circuit conversion into multiplexed voltage signal all the way.Multiplexed voltage signal is converted into channelized frequencies signal all the way by voltage-frequency conversion circuit.Sampling control circuit includes governor circuit, and governor circuit gathers the sampled signal of multiple sampling resistors according to channelized frequencies signal by signal gating circuit period property.Drive circuit of the present utility model or the drive circuit board with drive circuit only export signal all the way, and save space facilitates wiring and operation.
Description
Technical field
The utility model is related to a kind of sample circuit, more particularly to a kind of multi-module type sample circuit.
Background technology
With photovoltaic DC-to-AC converter more high power density, the development trend of more high level, come real using multimode connection scheme
Now more high-power output and more high level application turn into more and more universal phenomenon.
The number of module splicing is more, it is necessary to the way of acquisition module NTC temperature is more in power modules.It is conventional at present
Multi-module type temperature sampling circuit scheme 1, refers to Fig. 1, is resistance RNTCFirst pass through the sampling for driving winding displacement to be transferred to outside module
On control panel, then sequentially pass through bleeder circuit change into weak electric signal, multi channel selecting multiplexing chip process circuit change into all the way electricity
After pressure signal, isolation and modulate circuit, the AD thief hatch of DSP is ultimately sent to.Scheme 2, refers to Fig. 2, the resistance R of each moduleNTC
Voltage division processing is first completed on drive circuit board, then by taking maximum or minimum voltage processing of circuit, ultimately produces voltage all the way
Signal is externally exported.
It is not enough to there is following several aspects in above two scheme：1st, module splicing number is more, the NTC that module is externally exported
Sampling cable radical is more, and sampling line is thicker, and scheme 1 is unfavorable for operating and produces；2nd, NTC resistance turns in scheme 1 and scheme 2
It is melted into weak voltage signal to be exported from drive circuit board, easily by electromagnetic interference, causes NTC temperature samplings to be forbidden, or even machine
Device is protected by mistake；3rd, the highest NTC temperature in concatenation module can only be gathered in scheme 2, it is impossible to monitor the temperature conditions of modules.
Utility model content
For in solution module multimode connection scheme, drive circuit or the up-sampling of the drive circuit board with drive circuit are believed
Number output cord (such as NTC temperature acquisitions signal output cable) radical is more, causes cable thicker, is difficult the skill of wiring and operation
Art problem, the utility model provides a kind of multi-module type sample circuit, its drive circuit or the drive circuit with drive circuit
Plate only exports signal all the way, and save space facilitates wiring and operation.
The utility model concrete technical scheme is as follows：A kind of multi-module type sample circuit, it includes drive circuit, sampling control
Circuit processed and multiple sampling resistors, the sampling control circuit are used to control the drive circuit to drive the multiple sampling resistor
Carry out multimode data sampling；The drive circuit includes signal gating circuit, voltage-frequency conversion circuit, multiple bleeder circuits；Often
The sampled signal of corresponding sampling resistor is converted to voltage signal by individual sampling resistor by a bleeder circuit；Plurality of voltages signal
By the signal gating circuit conversion into multiplexed voltage signal all the way；The multiplexed voltage signal changes electricity by the voltage-frequency
Road is converted into channelized frequencies signal all the way；The sampling control circuit includes governor circuit, and the governor circuit is according to described multiple
The sampled signal of the multiple sampling resistor is gathered by the signal gating circuit period property with frequency signal.
Used as the further improvement of such scheme, the drive circuit is respectively designed to two pieces with the sampling control circuit
Circuit board.
As the further improvement of such scheme, the setting signal between the drive circuit and the sampling control circuit
Isolation circuit.
Further, the signal isolation circuit sampling photoelectrical coupler.
Further, the signal isolation circuit is arranged in the drive circuit and the sampling control circuit at least
In one.
As the further improvement of such scheme, the sampling resistor be for collecting temperature signal NTC resistance or
For the piezo-resistance of collection voltages signal.
Used as the further improvement of such scheme, the signal gating circuit uses analog multiplexer.
Further, the analog multiplexer is high speed analog multiplexer CD74HC4067.
As the further improvement of such scheme, the voltage-frequency conversion circuit sampling voltage-frequency conversion chip.
Further, the voltage-frequency conversion chip is chip AD7740.
So that sampling resistor is the NTC resistance for collecting temperature signal as an example, main beneficial effect of the present utility model is such as
Under：The NTC temperature signals of the firstth, drive circuit only have channelized frequencies signal all the way externally to export, and cable is thinner, convenient operation,
More adapt to the miniaturization of module；Secondth, RNTCChannelized frequencies signal transmission is converted into, is passed relative to conventional weak electric signal
Defeated, more reliably, it is farther that transmission range can be done, and facilitates the system integration；3rd, program energy monitor in real time modules
NTC temperature.
Brief description of the drawings
Fig. 1 is the circuit module figure of the multi-module type sample circuit of existing scheme 1.
Fig. 2 is the circuit module figure of the multi-module type sample circuit of existing scheme 2.
Fig. 3 is the circuit module figure of the multi-module type sample circuit of the utility model embodiment 1.
Fig. 4 is the module map of the drive circuit of the multi-module type sample circuit of the utility model embodiment 2.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, is not used to limit the utility model.
Embodiment 1
Fig. 3 is referred to, multi-module type sample circuit of the present utility model includes drive circuit, sampling control circuit and multiple
Sampling resistor.The sampling control circuit carries out multimode block number for controlling the multiple sampling resistor of the drive circuit driving
According to sampling.The drive circuit is respectively designed to two pieces of circuit boards in actual applications with the sampling control circuit：Drive electricity
Road plate and sampling control circuit plate.Sampling resistor can be for the NTC resistance of collecting temperature signal or for collection voltages letter
Number piezo-resistance.
The drive circuit includes signal gating circuit 2, voltage-frequency conversion circuit 3, multiple bleeder circuits 1；And the sampling
Control circuit includes governor circuit 4.Signal isolation electricity is preferably provided between the drive circuit and the sampling control circuit
Road 5.The signal isolation circuit can sample photoelectrical coupler.The signal isolation circuit 5 is arranged on the drive circuit and institute
State at least one of sampling control circuit, the signal transmssion line preferably between drive circuit board and sampling control circuit plate
Road is respectively provided with signal isolation circuit 5.
The sampled signal of this sampling resistor is converted to voltage signal by each sampling resistor by a bleeder circuit 1, can
By RNTCResistance is connected with bleeder circuit 1, reference voltage, exports RNTCResistive voltage is sampling resistor voltage.Plurality of voltages signal
Multiplexed voltage signal all the way is converted into by the signal gating circuit 2；The multiplexed voltage signal is changed by the voltage-frequency
Circuit 3 is converted into channelized frequencies signal all the way；The governor circuit 4 passes through the signal gating according to the channelized frequencies signal
The periodicity of circuit 2 gathers the sampled signal of each sampling resistor.The way of gate voltage signal, sends fixation successively as needed
The control signal of strobe cycle, completes plurality of voltages signal to the conversion of multiplexed voltage signal all the way.
In this programme, sampling resistor first passes through partial pressure on drive circuit board and changes into voltage signal, then many by having
The signal gating circuit 2 of road signal multiplexing gating function, is converted into multiplexed voltage signal all the way, finally by voltage-frequency conversion and light
After coupling isolation processing, in output to the sampling control circuit plate outside drive circuit board, QEP mouthfuls of DSP is finally sent to.
Scheme is overlapped for multimode, the sampling such as NTC temperature to modules is accurately detected, carrys out monitoring module
Running status becomes particularly important.If the method 1 that current module NTC temperature commonly uses detection is RNTC (1~n)Sampled signal line and drive
Dynamic pwm signal line is directly exported onto outside controlling of sampling plate by a stranded cable from drive circuit board, RNTC (1~n)Again
By partial pressure, gating and isolation and modulate circuit, AD mouthfuls of control chip is finally sent to.The NTC that there is module output is adopted
Sample holding wire is more, and cable is thicker, and the larger, operability of bulk requirement is poor, and NTC weak electric signals are transferred to outside module
Portion, is easily subject to PWM high-frequency signals and module internal electromagnetic interference, and reliability is poor.
The method 2 that module NTC temperature commonly uses detection is on module internal drive circuit board, first by each module
RNTC (1~n)Processed by partial pressure, by value circuit (taking minimum voltage or maximum voltage), voltage-frequency signal is changed and isolated
Processing of circuit, module NTC temperature signals only export channelized frequencies signal all the way, are reprocessed on outside controlling of sampling plate and finally sent
To QEP mouthfuls of control chip.The inferior position of the program is that a module only gathers maximum NTC temperature signals all the way, it is impossible to monitored
The NTC temperature conditions of other modules.
This programme set advantage of such scheme 1 and scheme 2, first by the sample circuit R of each module samples point such as
RNTC (1~n)Processed by partial pressure, by gating multiplexing process, the conversion of voltage-frequency signal and light-coupled isolation, although module NTC temperature
Signal only exports channelized frequencies signal all the way, but contains the NTC signals of modules, locates again on sampling control circuit plate
Last be sent to control chip QEP mouthfuls of reason, control chip obtains the NTC signals of modules by sweeping the mode of seeking.Therefore, the party
The advantage of case is：Firstth, the NTC temperature signals of module internal multimode, drive circuit board only has channelized frequencies signal all the way
Externally output, cable is thinner, convenient operation, more adapts to the miniaturization of module；Secondth, RNTCIt is converted into channelized frequencies signal
Transmission, transmits relative to conventional weak electric signal, and more reliably, it is farther that transmission range can be done, and facilitates the system integration；The
3rd, the NTC temperature of program energy monitor in real time modules.
Embodiment 2
Also referring to Fig. 3 and Fig. 4, the multi-module type of the design of the multi-module type sample circuit of embodiment 2 in embodiment 1
It is more careful in the design of sample circuit.The sampling resistor of embodiment 2 is the NTC resistance for collecting temperature signal, embodiment 2
Multi-module type sample circuit, signal gating circuit 2 uses analog multiplexer, such as high speed analog multiplexer
CD74HC4067；The sampling voltage-frequency conversion chip of the voltage-frequency conversion circuit 3, such as chip AD7740.
Xian Duimei roads NTC electric resistance partial pressures, are all converted into voltage signal, and NTC resistance is typically all negative temperature coefficient, is done here
Method be NTC resistant series on the resistance (preferably sampling resistor carries out partial pressure) of bleeder circuit 1, the change of such NTC resistance temperatures,
NTC partial pressures are just with change.
Multichannel NTC electric resistance partial pressures voltage signal is converted into all the way again by high speed analog multiplexer CD74HC4067
Multiplexed voltage signal.Thus complete the output of multimode multiple NTC resistance and change into multiplexed voltage signal output all the way.
Again by this all the way multiplexed voltage signal by voltage-frequency conversion chip (chip AD7740), be converted into channelized frequencies all the way
Signal, conversion coefficient Fout=0.1*fCLKIN+0.8(Vin/Vref)*fCLKIN, then exported by light-coupled isolation, it is sent to outside
MCU, MCU set the gating time of multiplexed signals, it is possible to collect the temperature of each NTC module.
Solve in module multimode connection scheme, NTC temperature samplings signal output cable radical is more on drive circuit board,
Cause cable thicker, be difficult wiring and operation.And only output multiplexing NTC temperature multiplexing all the way on the drive circuit board of the present embodiment
Channelized frequencies signal, save space facilitates wiring and operation.NTC temperature voltage signals output on drive circuit board, becomes multiplexing
Frequency signal is exported, anti-interference enhancing, is worked more reliable.The temperature data of modules can be gathered, more safe and reliable.
Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of multi-module type sample circuit, it includes drive circuit, sampling control circuit and multiple sampling resistors, the sampling
Control circuit carries out multimode data sampling for controlling the multiple sampling resistor of the drive circuit driving；Its feature exists
In：The drive circuit includes signal gating circuit, voltage-frequency conversion circuit, multiple bleeder circuits；Each sampling resistor passes through one
The sampled signal of corresponding sampling resistor is converted to voltage signal by individual bleeder circuit；Plurality of voltages signal passes through the signal gating
Circuit conversion is into multiplexed voltage signal all the way；The multiplexed voltage signal is converted into being multiplexed all the way by the voltage-frequency conversion circuit
Frequency signal；The sampling control circuit includes governor circuit, and the governor circuit passes through institute according to the channelized frequencies signal
State the sampled signal that signal gating circuit period property gathers the multiple sampling resistor.
2. multi-module type sample circuit as claimed in claim 1, it is characterised in that：The drive circuit and the controlling of sampling
Circuit is respectively designed to two pieces of circuit boards.
3. multi-module type sample circuit as claimed in claim 1 or 2, it is characterised in that：Adopted with described in the drive circuit
Setting signal isolation circuit between sample control circuit.
4. multi-module type sample circuit as claimed in claim 3, it is characterised in that：The signal isolation circuit sampled light thermocouple
Clutch.
5. multi-module type sample circuit as claimed in claim 3, it is characterised in that：The signal isolation circuit is arranged on described
On at least one of drive circuit and described sampling control circuit.
6. multi-module type sample circuit as claimed in claim 1, it is characterised in that：The sampling resistor is for collecting temperature
The NTC resistance or the piezo-resistance for collection voltages signal of signal.
7. multi-module type sample circuit as claimed in claim 1, it is characterised in that：The signal gating circuit is more using simulation
Path multiplexer.
8. multi-module type sample circuit as claimed in claim 7, it is characterised in that：The analog multiplexer is high speed mould
Intend multiplexer CD74HC4067.
9. multi-module type sample circuit as claimed in claim 1, it is characterised in that：The voltage-frequency conversion circuit sampling voltage-frequency turns
Change chip.
10. multi-module type sample circuit as claimed in claim 9, it is characterised in that：The voltage-frequency conversion chip is chip
AD7740。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621277881.2U CN206235409U (en) | 2016-11-25 | 2016-11-25 | A kind of multi-module type sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621277881.2U CN206235409U (en) | 2016-11-25 | 2016-11-25 | A kind of multi-module type sample circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206235409U true CN206235409U (en) | 2017-06-09 |
Family
ID=58980066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621277881.2U Active CN206235409U (en) | 2016-11-25 | 2016-11-25 | A kind of multi-module type sample circuit |
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| CN (1) | CN206235409U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752588A (en) * | 2017-11-07 | 2019-05-14 | 上海大郡动力控制技术有限公司 | Electric machine controller DC bus-bar voltage signal sampling and monitoring circuit and method |
| CN116915254A (en) * | 2023-09-14 | 2023-10-20 | 鹏元晟高科技股份有限公司 | Multipath voltage isolation sampling circuit |
-
2016
- 2016-11-25 CN CN201621277881.2U patent/CN206235409U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752588A (en) * | 2017-11-07 | 2019-05-14 | 上海大郡动力控制技术有限公司 | Electric machine controller DC bus-bar voltage signal sampling and monitoring circuit and method |
| CN116915254A (en) * | 2023-09-14 | 2023-10-20 | 鹏元晟高科技股份有限公司 | Multipath voltage isolation sampling circuit |
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