CN104102250A - Temperature control circuit - Google Patents
Temperature control circuit Download PDFInfo
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- CN104102250A CN104102250A CN201410335727.5A CN201410335727A CN104102250A CN 104102250 A CN104102250 A CN 104102250A CN 201410335727 A CN201410335727 A CN 201410335727A CN 104102250 A CN104102250 A CN 104102250A
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Abstract
The invention discloses a temperature control circuit used for controlling a temperature of an atomizing chamber of a mass spectrometer sampling system. The atomizing chamber is provided with refrigerating sheets; the temperature control circuit comprises a program-controlled constant current source module used for providing a constant current power supply for the refrigerating sheets, a temperature sensor module used for acquiring a real-time temperature inside the atomizing chamber to obtain a temperature sampling signal, an analogue-digital conversion module coupled with the temperature sensor module and used for performing analogue-digital conversion on the temperature sampling signal, and a control module coupled between the program-controlled constant current source module and the analogue-digital conversion module and used for controlling output of the program-controlled constant current source module based on a value of the temperature sampling signal after being converted by the analogue-digital conversion module. The temperature control circuit realizes online circuit break detection function on the refrigerating sheets and the temperature sensor at the same time, and therefore can improve reliability and self-checking capability of the temperature control.
Description
Technical field
The present invention relates to mass spectrometer, particularly the temperature controlled temperature-control circuit of the spray chamber in mass spectrometer.
Background technology
Inductivity coupled plasma mass spectrometry technology (ICP-MS) is the analysis and testing technology developing rapidly in the 70's of 20th century, its principle is to utilize inductively coupled plasma that element ion contained in analytic sample is turned to charged ion, by ion transfer system, charged ion is introduced in mass analyzer, by different mass-to-charge ratioes separately, after device amplifies gas current after testing, provide analysis result by TT&C system processing.Compared with other analytical technology, described ICP-MS has that detection limit is low, the range of linearity is wide, can detect fast the advantages such as various elements simultaneously.Along with the expansion of range of application, ICP-MS has developed into the analysis and testing technology of a kind of routine of this area.
In general, mass spectrometer is mainly made up of sampling system, ion gun, ion importing and ion transfer, mass analyzer, detecting device, and wherein, sampling system is mass spectrometric important component part.In the sampling system of inductivity coupled plasma mass spectrometry, constant temperature plays an important role to instrumental analysis.First, under low temperature, when sample introduction, oxide will reduce, and makes to disturb to reduce, and sensing range improves to some extent; Secondly, under low temperature, can reduce the solvent load on plasma, even and the volatile solvent of tool, still can carry out direct ICP-MS analysis to it.Based on this 2 point, needing provides real-time temperature control to ICP-MS sampling system.
Sampling system generally comprises atomizer and spray chamber; spray chamber need adopt temperature control; at present; existing spray chamber temperature controller adopts the semiconductor chilling plate of Peltier (peltier) effect, and mainly adopts PWM technology to regulate temperature, still; existing control mode; be power supply taking constant pressure source as cooling piece, lack overcurrent protection and breakage detection function to cooling piece, also lack the breakage detection function to temperature sensor.
Summary of the invention
In view of above-mentioned, be necessary that the not enough problem that control brings for existing spray chamber temperature has proposed a kind of temperature-control circuit, specific as follows:
A kind of temperature-control circuit, controls for the temperature of the spray chamber to mass spectrometer sampling system, and described spray chamber is equipped with cooling piece, comprising:
Program controlled constant current source module, in order to provide constant-current supply to described cooling piece;
Temperature sensor module, in order to gather real time temperature in described spray chamber to obtain temperature sampling signal;
Analog-to-digital conversion module, is coupled to described temperature sensor module, in order to described temperature sampling signal is carried out to analog to digital conversion; And
Control module, is coupled between described program controlled constant current source module and described analog-to-digital conversion module, in order to control the output of described program controlled constant current source module according to described temperature sampling signal value after described analog-to-digital conversion module conversion.
In one embodiment, described temperature-control circuit, also comprises:
Current detection module, in order to detect to obtain a detection electric current and to transfer to described analog-to-digital conversion module to the output current of described program controlled constant current source module;
Voltage detection module, in order to detect to obtain a detection voltage and to transfer to described analog-to-digital conversion module to the supply voltage of described cooling piece; And
D/A converter module, be coupled between described program controlled constant current source module and described control module, wherein, described control module is controlled described D/A converter module according to described detection electric current, described detection voltage value after described analog-to-digital conversion module conversion, so that the output that described D/A converter module is described program controlled constant current source provides reference voltage base.
In one embodiment, described temperature-control circuit, also comprises:
Turn-off control module, be coupled between described program controlled constant current source module and described control module, wherein, described control module is controlled described shutoff control module according to described detection electric current, described detection voltage value after described analog-to-digital conversion module conversion, so that described shutoff control module is turn-offed control to described program controlled constant current source module.
In one embodiment, described program controlled constant current source module comprises:
Constant current source regulon, is coupled to described D/A converter module, described shutoff control module, in order to more described reference voltage base and described detection electric current to produce regulation voltage control signal;
Voltage conversion unit, is coupled to described constant current source regulon, in order to carry out voltage transitions according to described regulation voltage control signal;
First order current amplification unit, is coupled to described voltage conversion unit, in order to the output signal of described voltage conversion unit is carried out to electric current amplification to produce the first current signal;
Second level current amplification unit, is coupled to described first order current amplification unit, in order to described the first current signal is carried out to electric current amplification to produce the second current signal;
Current limliting unit, is coupled to described second level current amplification unit, in order to described the second current signal is carried out to current limliting to produce the 3rd current signal;
Filter unit, is coupled to described current limliting unit, in order to the 3rd current signal is carried out to filtering processing to produce the 4th current signal;
Power output end, its one end is coupled to described filter unit, and the other end is coupled to described cooling piece, in order to export described the 4th current signal to described cooling piece; And
Power supply return terminal, its one end is coupled to described cooling piece, and the other end is coupled to described constant current source regulon by described current detection module.
In one embodiment, described program controlled constant current source also comprises protected location, is coupled to described filter unit, in order to described filter unit is discharged.
In one embodiment, described temperature-control circuit, also comprises:
Constant current source module, in order to power to described temperature sensor module;
Whether the detection module that opens circuit, is coupled to described temperature sensor module and described constant current source intermodule, open circuit in order to detect described temperature sensor module.
In one embodiment, described temperature-control circuit, also comprises:
Temperature signal regulation module, is coupled between described temperature sensor module and described analog-to-digital conversion module, in order to described temperature sampling signal is processed and signal after processing is transferred to described analog-to-digital conversion module.
In one embodiment, described temperature sensor module is thermal resistance temperature sensor.
In one embodiment, described thermal resistance temperature sensor is four line platinum resistance sensors.
In one embodiment, described cooling piece is Peltier cooling piece.
As from the foregoing, in temperature-control circuit proposed by the invention, control module is controlled the output of program controlled constant current source module according to detection electric current, detection voltage, thereby can reach the meticulous control to cooling piece working current, make cooling piece in constant current source pattern, can avoid overcurrent damage cooling piece., electric current and voltage are detected in real time meanwhile, can realize the breakage detection function of cooling piece.In addition, turn-off control module and can turn-off in time program controlled constant current source module, unexpected impaired to prevent cooling piece.Further,
Also realize the breakage detection function of temperature sensor, made thus this temperature-control circuit realize the online breakage detection function of cooling piece and temperature sensor simultaneously, thereby can improve temperature controlled reliability and self-checking capability.
Brief description of the drawings
Fig. 1 has illustrated the module diagram of the temperature-control circuit of an embodiment of the present invention;
Fig. 2 has illustrated the module diagram of the temperature-control circuit of another embodiment of the present invention;
Fig. 3 has illustrated the module diagram of the temperature-control circuit of the another embodiment of the present invention; And
Fig. 4 has illustrated the module diagram of an embodiment of the program controlled constant current source module in Fig. 1, Fig. 2, Fig. 3.
Embodiment
In order to make relevant technical staff in the field understand better technical scheme of the present invention, below in conjunction with the accompanying drawing of embodiment of the present invention, technical scheme in embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
About " coupling " of occurring herein, can refer to the direct connection of two modules (or unit, element), also can refer to the indirect connection of two modules (or unit, element), between two modules (or unit, element), also have other module (or unit, element).
With reference to Fig. 1, Fig. 1 has illustrated the module diagram of the temperature-control circuit of an embodiment of the present invention.
In present embodiment, temperature-control circuit 1, controls for the temperature of the spray chamber to mass spectrometer sampling system, and spray chamber is equipped with cooling piece, and this cooling piece is semiconductor chilling plate, as, Peltier cooling piece.
As shown in Figure 1, temperature-control circuit 1 comprises program controlled constant current source module 11, temperature sensor module 12, analog-to-digital conversion module 13, control module 14.
Program controlled constant current source module 11, in order to provide constant-current supply to cooling piece (not illustrating), that is, and to cooling piece supply Constant Electric Current.
Temperature sensor module 12, in order to gather real time temperature in spray chamber to obtain temperature sampling signal.
Analog to digital conversion (ADC) module 13, is coupled to temperature sensor module 12, in order to temperature sampling signal is carried out to analog to digital conversion.
Control module 14, is coupled between program controlled constant current source module 11 and analog-to-digital conversion module 13, in order to control the output of program controlled constant current source module 11 according to temperature sampling signal value after analog-to-digital conversion module 13 conversions.
In present embodiment, because program controlled constant current source module 11 provides constant-current supply to cooling piece, make the cooling piece can be in constant current source pattern.
With reference to Fig. 2, Fig. 2 has illustrated the module diagram of the temperature-control circuit of another embodiment of the present invention.
As shown in Figure 2, temperature-control circuit 1 has also comprised current detection module 15, voltage detection module 16, D/A converter module 17, has turn-offed control module 18 with respect to Fig. 1.
Current detection module 15, in order to detect to obtain a detection electric current and to transfer to analog-to-digital conversion module 13 to the output current of program controlled constant current source module 11.
Voltage detection module 16, in order to detect to obtain a detection voltage and to transfer to analog-to-digital conversion module 13 to the supply voltage of cooling piece.
Digital-to-analog conversion (DAC) module 17, be coupled between program controlled constant current source module 11 and control module 17, wherein, control module 17 according to detecting electric current, detect voltage value after analog-to-digital conversion module 13 conversion and control D/A converter module 17, so that D/A converter module 17 provides reference voltage base for the output of program controlled constant current source 11.
Turn-off control module 18, be coupled between program controlled constant current source module 11 and control module 14, wherein, control module 14 is turn-offed control module 18 according to detecting the value control after analog-to-digital conversion module 13 conversions of electric current, detection voltage, so that shutoff control module 18 is turn-offed control to program controlled constant current source module 11.
In present embodiment, control module 14 is also controlled the output of program controlled constant current source module 11 according to detection electric current, detection voltage, thereby can reach the meticulous control to cooling piece working current, has avoided overcurrent damage cooling piece., electric current and voltage are detected in real time meanwhile, can realize the breakage detection function of cooling piece.In addition, turn-off control module 18 and can turn-off in time program controlled constant current source module 11, unexpected impaired to prevent cooling piece.
With reference to Fig. 3, Fig. 3 has illustrated the module diagram of the temperature-control circuit of the another embodiment of the present invention.As shown in Figure 3, temperature-control circuit 1 has further comprised constant current source module 19, detection module 20 and temperature signal regulation module 21 open circuit.
Constant current source module 19, in order to temperature sensor module 12 is powered, constant current source power supply can be obtained linear temperature-magnitude of voltage at temperature sensor module 12 ends, facilitates the collection of temperature and control in real time.
Whether the detection module 20 that opens circuit, is coupled between temperature sensor module 12 and constant current source module 19, open circuit, and testing result is sent to control module 14 in order to detected temperatures sensor assembly 12.
In one embodiment, temperature sensor module 12 can be thermal resistance temperature sensor, preferably, be four line platinum resistance sensors, by selecting four line platinum resistance thermometer sensor,s, can effectively reduce the impact of lead-in wire on temperature acquisition, correspondingly, by switching platinum resistance thermometer sensor, four line connected modes, realize the detection of opening circuit of temperature sensor module 12, specifically, by two groups of lines are alternately connected to constant current source module 19 loops, detect the voltage of constant current source module 19 precision resistance ends, realize the detection of opening circuit to temperature sensor module 12.
With reference to Fig. 4, Fig. 4 has illustrated the module diagram of an embodiment of the program controlled constant current source module in Fig. 1, Fig. 2, Fig. 3.
As shown in Figure 4, program controlled constant current source module 11 comprises constant current source regulon 111, voltage conversion unit 112, first order current amplification unit 113, second level current amplification unit 114, current limliting unit 115, filter unit 116, power output end 117, power supply return terminal 118 and protected location 119.
Constant current source regulon 111, is coupled to D/A converter module 17, turn-offs control module 18, in order to comparison reference voltage benchmark with detect electric current to produce regulation voltage control signal.
Voltage conversion unit 112, is coupled to constant current source regulon 111, in order to carry out voltage transitions according to regulation voltage control signal.
First order current amplification unit 113, is coupled to voltage conversion unit 112, in order to the output signal of voltage conversion unit 112 is carried out to electric current amplification to produce the first current signal.
Second level current amplification unit 114, is coupled to first order current amplification unit 113, in order to the first current signal is carried out to electric current amplification to produce the second current signal.
Current limliting unit 115, is coupled to second level current amplification unit 114, in order to the second current signal is carried out to current limliting to produce the 3rd current signal.
Filter unit 116, is coupled to current limliting unit 115, and in order to the 3rd current signal is carried out to filtering processing to produce the 4th current signal, this filter unit 116, can be electrochemical capacitor, and electrochemical capacitor as certain in parallel connection is realized filtering.
Power output end 117, its one end is coupled to filter unit 116, and the other end is coupled to cooling piece (not illustrating), in order to export the 4th current signal to cooling piece.
Power supply return terminal 118, its one end is coupled to cooling piece (not illustrating), and the other end is coupled to constant current source regulon 111 by current detection module 15.
Protected location 119, is coupled to filter unit 116, in order to filter unit 116 is discharged, as electrochemical capacitor is discharged.
As from the foregoing, in temperature-control circuit proposed by the invention, control module is controlled the output of program controlled constant current source module according to detection electric current, detection voltage, thereby can reach the meticulous control to cooling piece working current, make cooling piece in constant current source pattern, can avoid overcurrent damage cooling piece., electric current and voltage are detected in real time meanwhile, can realize the breakage detection function of cooling piece.In addition, turn-off control module and can turn-off in time program controlled constant current source module, unexpected impaired to prevent cooling piece.Further,
Also realize the breakage detection function of temperature sensor, made thus this temperature-control circuit realize the online breakage detection function of cooling piece and temperature sensor simultaneously, thereby can improve temperature controlled reliability and self-checking capability.
Below only expressed part embodiment of the present invention, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a temperature-control circuit, controls for the temperature of the spray chamber to mass spectrometer sampling system, and described spray chamber is equipped with cooling piece, it is characterized in that, comprising:
Program controlled constant current source module, in order to provide constant-current supply to described cooling piece;
Temperature sensor module, in order to gather real time temperature in described spray chamber to obtain temperature sampling signal;
Analog-to-digital conversion module, is coupled to described temperature sensor module, in order to described temperature sampling signal is carried out to analog to digital conversion; And
Control module, is coupled between described program controlled constant current source module and described analog-to-digital conversion module, in order to control the output of described program controlled constant current source module according to described temperature sampling signal value after described analog-to-digital conversion module conversion.
2. temperature-control circuit according to claim 1, is characterized in that, also comprises:
Current detection module, in order to detect to obtain a detection electric current and to transfer to described analog-to-digital conversion module to the output current of described program controlled constant current source module;
Voltage detection module, in order to detect to obtain a detection voltage and to transfer to described analog-to-digital conversion module to the supply voltage of described cooling piece; And
D/A converter module, be coupled between described program controlled constant current source module and described control module, wherein, described control module is controlled described D/A converter module according to described detection electric current, described detection voltage value after described analog-to-digital conversion module conversion, so that the output that described D/A converter module is described program controlled constant current source provides reference voltage base.
3. temperature-control circuit according to claim 2, is characterized in that, also comprises:
Turn-off control module, be coupled between described program controlled constant current source module and described control module, wherein, described control module is controlled described shutoff control module according to described detection electric current, described detection voltage value after described analog-to-digital conversion module conversion, so that described shutoff control module is turn-offed control to described program controlled constant current source module.
4. temperature-control circuit according to claim 3, is characterized in that, described program controlled constant current source module comprises:
Constant current source regulon, is coupled to described D/A converter module, described shutoff control module, in order to more described reference voltage base and described detection electric current to produce regulation voltage control signal;
Voltage conversion unit, is coupled to described constant current source regulon, in order to carry out voltage transitions according to described regulation voltage control signal;
First order current amplification unit, is coupled to described voltage conversion unit, in order to the output signal of described voltage conversion unit is carried out to electric current amplification to produce the first current signal;
Second level current amplification unit, is coupled to described first order current amplification unit, in order to described the first current signal is carried out to electric current amplification to produce the second current signal;
Current limliting unit, is coupled to described second level current amplification unit, in order to described the second current signal is carried out to current limliting to produce the 3rd current signal;
Filter unit, is coupled to described current limliting unit, in order to the 3rd current signal is carried out to filtering processing to produce the 4th current signal;
Power output end, its one end is coupled to described filter unit, and the other end is coupled to described cooling piece, in order to export described the 4th current signal to described cooling piece; And
Power supply return terminal, its one end is coupled to described cooling piece, and the other end is coupled to described constant current source regulon by described current detection module.
5. temperature-control circuit according to claim 4, is characterized in that, described program controlled constant current source also comprises protected location, is coupled to described filter unit, in order to described filter unit is discharged.
6. temperature-control circuit according to claim 1, is characterized in that, also comprises:
Constant current source module, in order to power to described temperature sensor module;
Whether the detection module that opens circuit, is coupled to described temperature sensor module and described constant current source intermodule, open circuit in order to detect described temperature sensor module.
7. temperature-control circuit according to claim 1, is characterized in that, also comprises:
Temperature signal regulation module, is coupled between described temperature sensor module and described analog-to-digital conversion module, in order to described temperature sampling signal is processed and signal after processing is transferred to described analog-to-digital conversion module.
8. temperature-control circuit according to claim 1, is characterized in that, described temperature sensor module is thermal resistance temperature sensor.
9. temperature-control circuit according to claim 8, is characterized in that, described thermal resistance temperature sensor is four line platinum resistance sensors.
10. temperature-control circuit according to claim 1, is characterized in that, described cooling piece is Peltier cooling piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410335727.5A CN104102250B (en) | 2014-07-15 | Temperature-control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410335727.5A CN104102250B (en) | 2014-07-15 | Temperature-control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104102250A true CN104102250A (en) | 2014-10-15 |
| CN104102250B CN104102250B (en) | 2017-01-04 |
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Cited By (1)
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| CN113551516A (en) * | 2021-08-04 | 2021-10-26 | 东莞市绿源电气科技有限公司 | Hopper drying energy-saving controller |
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| CN113551516A (en) * | 2021-08-04 | 2021-10-26 | 东莞市绿源电气科技有限公司 | Hopper drying energy-saving controller |
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