CN206773086U - Charge balance detects circuit - Google Patents
Charge balance detects circuit Download PDFInfo
- Publication number
- CN206773086U CN206773086U CN201720638296.9U CN201720638296U CN206773086U CN 206773086 U CN206773086 U CN 206773086U CN 201720638296 U CN201720638296 U CN 201720638296U CN 206773086 U CN206773086 U CN 206773086U
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- circuit
- charge balance
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- transformer
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Abstract
The utility model provides a kind of charge balance detection circuit, and the charge balance detection circuit includes single-chip microcomputer, transformer and its driving；Integrating circuit, the input of the integrating circuit connect output end corresponding with the input of the transformer, and the integrating circuit includes：At least two different electric capacity；Switching switch, the switching switch are used for any one for making the output end optionally electrically connect in electric capacity.The utility model has the advantages that dynamic range is big, good wave filtering effect, strong antijamming capability.
Description
Technical field
It the utility model is related to detection circuit, more particularly to charge balance detection circuit.
Background technology
Charge detection circuit has in many detecting instruments in use, such as chromatogram, mass spectrum, spectrum at present；Due to by
Signal bandwidth, range of signal are limited, and charge detection circuit can not meet all application requirements.Such as in order to which signal bandwidth is done
It is bigger need to reduce integrating capacitor, and too small integrating capacitor causes signal to be easily saturated, that is, reduces signal dynamics model
Enclose.In turn if increase integrating capacitor, then signal bandwidth will be reduced, can be become simultaneously for the detection sensitivity of small-signal
Difference, while integrating circuit calibration trouble and heat endurance are poor, many occasion temperature changes that actually use are violent, cause circuit to float
It is big to move change, causes the problems such as steady in a long-term poor.
Solve temperature stability issues at present, conventional method is buckled by temperature and the relativeness of drift from software
Except the part of drift is come the stabilization realized, but this scheme can not inherently solve problem, be needed based on problem above
Design a kind of new charge balance detection circuit.
Utility model content
In order to solve the deficiency in above-mentioned prior art, the utility model provides that a kind of dynamic range is big, signal
The charge balance detection circuit that the accuracy of detection is high, input signal band is wide.
The purpose of this utility model is achieved through the following technical solutions：
Charge balance detects circuit, and the charge balance detection circuit includes single-chip microcomputer, transformer and its driving；The electricity
Lotus balance detection circuit further comprises：
Integrating circuit, the input of the integrating circuit connect output end corresponding with the input of the transformer, institute
Stating integrating circuit includes：
At least two different electric capacity；
Switching switch, the switching switch are used for any one for making the output end optionally electrically connect in electric capacity.
Circuit is detected according to above-mentioned charge balance, alternatively, the charge balance detection circuit further comprises：
Filter circuit, the input of the filter circuit connect the integrating circuit, and output end connects the single-chip microcomputer.
Circuit is detected according to above-mentioned charge balance, alternatively, the charge balance detection circuit further comprises：
Analog to digital conversion circuit, the input of analog-digital conversion circuit as described connect the filter circuit, described in output end connection
Single-chip microcomputer.
Circuit is detected according to above-mentioned charge balance, it is preferable that the filter circuit is 2 rank filter circuits.
Circuit is detected according to above-mentioned charge balance, alternatively, the driving includes：
Driving voltage control module, one end of the driving voltage control module connect the transformer, other end connection
The single-chip microcomputer；
Drive circuit module, one end of the drive circuit module connect the transformer, other end connection electric voltage frequency
Change-over circuit；
Voltage frequency conversioning circuit, voltage frequency conversioning circuit connect the single-chip microcomputer.
Compared with prior art, the utility model have the advantage that for：
1. the circuit can adjust with input signal size variation dynamic, the dynamic range of input signal, tool are improved
There is wider input signal bandwidth；
2. having relatively good temperature stability, long-time stability are good；
3. self-calibration function can be completed, it is easy to use；
4. improve accuracy and the sensitivity of signal detection；
5. circuit closed-loop control, strong antijamming capability；
6. input signal good wave filtering effect.
Brief description of the drawings
Referring to the drawings, disclosure of the present utility model will be easier to understand.Skilled addressee readily understands that
It is：These accompanying drawings are used only for illustrating the technical solution of the utility model, and are not intended to protection of the present utility model
Scope is construed as limiting.In figure：
Fig. 1 is the structure diagram that circuit is detected according to the charge balance of the utility model embodiment.
Embodiment
Fig. 1 and optional embodiment of the present utility model is following description described to instruct those skilled in the art how real
Apply and reproduce the utility model.In order to instruct technical solutions of the utility model, simplify or eliminate some conventional aspects.Ability
Field technique personnel should be appreciated that modification from these embodiments or replacement will be in the scope of the utility model.This area skill
Art personnel should be appreciated that following characteristics can combine to form multiple modifications of the present utility model in a variety of ways.Thus, this reality
Following optional embodiments are not limited to new, and are only limited by claim and their equivalent.
Embodiment：
Fig. 1 schematically illustrates the charge balance detection circuit of the utility model embodiment, as shown in figure 1, the electricity
Lotus balance detection circuit includes：
Single-chip microcomputer；
Transformer and its driving, the driving include：
Driving voltage control module, one end of the driving voltage control module connect the transformer, other end connection
The single-chip microcomputer；
Drive circuit module, one end of the drive circuit module connect the transformer, other end connection electric voltage frequency
Change-over circuit；
Voltage frequency conversioning circuit, voltage frequency conversioning circuit connect the single-chip microcomputer；
Integrating circuit, the input of the integrating circuit connect output end corresponding with the input of the transformer, institute
Stating integrating circuit includes：
At least two different electric capacity；
Switching switch, the switching switch are used for any one for making the output end optionally electrically connect in electric capacity；
Filter circuit, such as 2 rank filter circuits, the input of the filter circuit connect the integrating circuit, and output end connects
Connect the single-chip microcomputer；
Analog to digital conversion circuit, the input of analog-digital conversion circuit as described connect the filter circuit, described in output end connection
Single-chip microcomputer.
The working method of above-mentioned charge balance detection circuit is：
Signal input use coaxial cable, and anti-stop signal is disturbed, it is necessary to the protection Design of attention port and anti-interference set
Meter.
Input signal is by the amplifier input in the secondary connection integrating circuit of transformer, if detection weak current letter
Number, it is necessary to do corresponding processing on circuit boards, for example protection ring is spread around signal wire, protection ring is fixed with current potential
Cabling.Charge integration electric capacity on amplifier feedback circuit, the importance of the electric capacity, can influence circuit temperature characterisitic and
Sensitivity.It is required that the dielectric constant of electric capacity is stable, frequency characteristic flat, while require that insulation impedance is bigger, good temp characteristic,
Its parameter needs to be determined according to physical circuit requirement in actual circuit, such as input current scope, actual use temperature range
Required with incoming frequency etc..Need to debug out a suitable value in actual circuit debugging process.
By integrating circuit, into second-order filter circuit, the filter circuit can use active filter circuit to make
With passive filter circuit, it is important to which the bandwidth of filtering will select properly, to disclosure satisfy that signal detection demand.
Signal after circuit, is divided into two-way after filtering：
Analog quantity is converted into digital quantity into analog-digital converter all the way, into single-chip microcomputer；
Another way then enters electric voltage frequency conversion circuit module, and voltage-frequency conversion circuit converts signals into corresponding frequencies, pressure
Frequency converter circuit is an electric voltage frequency linear transform circuit.The frequency signal controls transformer drive circuit module, transformer
Secondary exports corresponding pulses signal, and the pulse signal can play the electric charge in release integrating capacitor, and sensor input signal is such as
The direct integral of fruit one will make integrating circuit saturation, it is necessary to discharge the accumulation electricity on integrating circuit by the pulse signal of transformer
Lotus, so integrating circuit can be formed in integral charge and the dynamic process for discharging electric charge.
The driving voltage of transformer primary side is to control, and its driving voltage is controlled by single-chip microcomputer, because actually using
Need to match when the output frequency and voltage pulse output of middle transformer secondary.Feedback circuit realizes the negative-feedback control of circuit
System, enables a system to achieve dynamic stability, and as input signal becomes big, the frequency of transformer output pulse becomes big, meaning release
Electric charge speed is also accelerated, and integrator circuit output signal is maintained balance.And the frequency of integrator output inputs with sensor
Signal intensity and change, this frequency signal passes through second-order filter signal, and direct current signal is obtained after filtering out high-frequency signal, the direct current letter
Number it is exactly measured sensor signal.The reference frequency output of voltage frequency conversioning circuit is controlled by single-chip microcomputer, and this frequency needs
To be determined according to dynamic range of signals actual test.
Claims (5)
1. charge balance detects circuit, the charge balance detection circuit includes single-chip microcomputer, transformer and its driving；Its feature exists
In：The charge balance detection circuit further comprises：
Integrating circuit, the input of the integrating circuit connect output end corresponding with the input of the transformer, the product
Parallel circuit includes：
At least two different electric capacity；
Switching switch, the switching switch are used for any one for making the output end optionally electrically connect in electric capacity.
2. charge balance according to claim 1 detects circuit, it is characterised in that：The charge balance detection circuit enters one
Step includes：
Filter circuit, the input of the filter circuit connect the integrating circuit, and output end connects the single-chip microcomputer.
3. charge balance according to claim 2 detects circuit, it is characterised in that：The charge balance detection circuit enters one
Step includes：
Analog to digital conversion circuit, the input of analog-digital conversion circuit as described connect the filter circuit, and output end connects the monolithic
Machine.
4. charge balance according to claim 2 detects circuit, it is characterised in that：The filter circuit is 2 rank filtered electricals
Road.
5. charge balance according to claim 1 detects circuit, it is characterised in that：The driving includes：
Driving voltage control module, one end of the driving voltage control module connect the transformer, described in other end connection
Single-chip microcomputer；
Drive circuit module, one end of the drive circuit module connect the transformer, other end connection voltage to frequency convert
Circuit；
Voltage frequency conversioning circuit, voltage frequency conversioning circuit connect the single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720638296.9U CN206773086U (en) | 2017-06-05 | 2017-06-05 | Charge balance detects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720638296.9U CN206773086U (en) | 2017-06-05 | 2017-06-05 | Charge balance detects circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206773086U true CN206773086U (en) | 2017-12-19 |
Family
ID=60636376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720638296.9U Expired - Fee Related CN206773086U (en) | 2017-06-05 | 2017-06-05 | Charge balance detects circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206773086U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113238088A (en) * | 2021-05-08 | 2021-08-10 | 中国测试技术研究院辐射研究所 | High-precision weak current measuring circuit and method based on charge balance |
-
2017
- 2017-06-05 CN CN201720638296.9U patent/CN206773086U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113238088A (en) * | 2021-05-08 | 2021-08-10 | 中国测试技术研究院辐射研究所 | High-precision weak current measuring circuit and method based on charge balance |
| CN113238088B (en) * | 2021-05-08 | 2023-01-20 | 中国测试技术研究院辐射研究所 | High-precision weak current measuring circuit and method based on charge balance |
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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: 20171219 Termination date: 20190605 |