CN103984376A - Circuit for controlling heating power of load - Google Patents
Circuit for controlling heating power of load Download PDFInfo
- Publication number
- CN103984376A CN103984376A CN201410203762.1A CN201410203762A CN103984376A CN 103984376 A CN103984376 A CN 103984376A CN 201410203762 A CN201410203762 A CN 201410203762A CN 103984376 A CN103984376 A CN 103984376A
- Authority
- CN
- China
- Prior art keywords
- circuit
- unit
- output
- follower
- power amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention relates to a circuit for controlling heating power of a load, and belongs to the field of control circuits. A given circuit unit of the circuit is connected with the input of an error amplifier, a temperature sampling unit is connected with the input of a protection circuit and the input of an operational amplifier simultaneously, and the output of the operational amplifier is connected with the input of the error amplifier. The output of the error amplifier and the output of the protection circuit are connected with the input of a power amplifier simultaneously, and the output of the power amplifier is connected with the load. The given circuit unit, a follower and a set value test point are connected in sequence, and the output of the operational amplifier, the follower and a real-time temperature test point are connected in sequence. According to the circuit for controlling the heating power of the load, the temperature of a heating wire can be controlled precisely, a temperature curve is basically a straight line, good control precision and stability are achieved, and the circuit for controlling the heating power of the load is suitable for places where the temperature is controlled precisely. The set value test point and the real-time temperature test point are arranged outside, so that control situations are conveniently monitored at any time.
Description
Technical field
The present invention relates to control circuit field, especially a kind of control load heating power circuit.
Background technology
Along with the development of modern industry, application controls heter temperature occasion is also more and more.General Control, temperature curve heaving of the sea, engrail, but cost is low; The good SCR control of temperature linearity degree, needs trigger circuit, circuit complexity, and cost is high, and application is restricted.It is better that market lacks the temperature control linearity, the product that cost performance is high.
Summary of the invention
The object of the present invention is to provide the one can be with real time temperature and setting value error change, output power changes thereupon, and makes the control load heating power circuit of temperature constant.
For achieving the above object, the present invention has adopted following technical scheme: a kind of control load heating power circuit, comprises given circuit unit, temperature sampling unit, power amplifier unit, setting value test point, real time temperature test point and follower; The output terminal of described given circuit unit is connected with an input end of power amplifier unit, and the output terminal of temperature sampling unit is connected with another input end of power amplifier unit, and the output of power amplifier unit is connected with load; Described given circuit unit, the second follower, setting value test point are connected successively; Described temperature sampling unit, the 3rd follower, real time temperature test point are connected successively.
Preferably, described given circuit unit comprises voltage adjuster and setting value circuit; The output terminal of described voltage adjuster connects the input end of setting value circuit, and the output terminal of setting value circuit connects the first follower.
Preferably, described temperature sampling unit comprises temperature sampling circuit and operational amplifier, and the output terminal of temperature sampling circuit is connected with operational amplifier normal phase input end, and its anti-phase input terminating resistor is to ground, and resistance-capacitance network composition voltage negative peripheral with it fed back; The output of operational amplifier is connected with the input end of power amplifier unit.
Preferably, described power amplifier unit comprises error amplifier and power amplifier, and the output of error amplifier is connected with power amplifier input, and power amplifier output is connected with load; Error amplifier and peripheral CR oscillation circuit composition voltage negative feedback.
Preferably, described follower is voltage follower.
The invention has the beneficial effects as follows: temperature sampling circuit makes temperature signal become voltage signal, is V after operational amplifier
o1, set-point circuit output voltage is V
r, △ V=V
r-V
o1larger, error amplifier output V
o2larger, power amplifier enlargement factor is larger, and the voltage that outputs to load is larger, and heating power is larger.When heating power and the heat radiation of heater strip reach balance, △ V reaches a stationary value, and heating power is constant, and temperature also reaches stationary value.In the time that temperature sensor is opened a way, holding circuit action, forbids power amplifier output, has protected circuit.The linearity of the control temperature in the present invention is better in addition, and extremely can observe immediately appears in convenient operation.
Brief description of the drawings
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is operational amplifier and error amplifier circuit schematic diagram in the present invention;
Wherein 1. voltage adjusters, 2. setting value circuit, 3. the first follower, 4. the second follower, 5. setting value test point, 6. temperature sampling circuit, 7. operational amplifier, 8. error amplifier, 9. power amplifier, 10. holding circuit, 11. the 3rd followers, 12. real time temperature test points, 13. loads.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment only, for explaining the present invention, does not form the restriction of protection domain of the present invention.
A kind of control load heating power circuit, comprises given circuit unit, temperature sampling unit, power amplifier unit, setting value test point 5, real time temperature test point 12 and follower; The output terminal of described given circuit unit is connected with an input end of power amplifier unit, and the output terminal of temperature sampling unit is connected with another input end of power amplifier unit, and the output of power amplifier unit is connected with load; Described given circuit unit, the second follower 4, setting value test point 5 are connected successively.Temperature sampling unit, the 3rd follower 11, real time temperature test point 12 are connected successively.
Given circuit unit comprises voltage adjuster 1, setting value circuit 2, the first follower 3.The output terminal of voltage adjuster 1 connects the input end of setting value circuit 2, and the output terminal of setting value circuit 2 connects the first follower 3.
As shown in Figure 2, described temperature sampling circuit 6 is connected with operational amplifier 7 normal phase input ends, and its anti-phase input terminating resistor R11 and R12 are parallel to ground, CR oscillation circuit C4, R13 composition voltage negative feedback.Operational amplifier 7 is exported with error amplifier 8 inverting inputs and is connected.Given circuit unit is connected with error amplifier 8 normal phase input ends.Error amplifier 8 and CR oscillation circuit R19, C7 composition voltage negative feedback.Should be noted that the follower adopting in the present invention is voltage follower.
Thermistor detects load 13 temperature as temperature sensor, through divider resistance, forms the Voltage-output linear with thermistor, is connected with the normal phase input end of operational amplifier 7; Anti-phase input terminating resistor R11 and R12 are parallel to ground.CR oscillation circuit R13, C4 composition voltage negative feedback.After linear amplification, be V
o1, output to the inverting input of error amplifier 8; Setting value circuit 2 output voltage V of controlling by voltage adjuster 1
rto the in-phase input end of error amplifier 8; The two forms the input signal of error amplifier 8.The size of error signal has determined output V
o2size, V
o2determine again the enlargement factor of power amplifier 9, further determined again the heating voltage (being power) of load 13.
Heating power changes with the change of setting value like this, reaches the object that makes load 13 temperature stabilizations by control load 13 power.Holding circuit 10 works in the time that temperature sensor is opened a way.When open sensor, holding circuit action, makes power amplifier cut-off, forbids output.Prevent heater strip superheated under abnormal conditions, so that damage.This circuit control accuracy is high, with defencive function, safe and reliable.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (5)
1. a control load heating power circuit, is characterized in that: comprise given circuit unit, temperature sampling unit, power amplifier unit, setting value test point, real time temperature test point and follower; The output terminal of described given circuit unit is connected with an input end of power amplifier unit, and the output terminal of temperature sampling unit is connected with another input end of power amplifier unit, and the output of power amplifier unit is connected with load; Described given circuit unit, the second follower, setting value test point are connected successively; Described temperature sampling unit, the 3rd follower, real time temperature test point are connected successively.
2. control load heating power circuit according to claim 1, is characterized in that: described given circuit unit comprises voltage adjuster and setting value circuit; The output terminal of described voltage adjuster connects the input end of setting value circuit, and the output terminal of setting value circuit connects the first follower.
3. control load heating power circuit according to claim 1, it is characterized in that: described temperature sampling unit comprises temperature sampling circuit and operational amplifier, the output terminal of temperature sampling circuit is connected with operational amplifier normal phase input end, its anti-phase input terminating resistor is to ground, and resistance-capacitance network composition voltage negative peripheral with it fed back; The output of operational amplifier is connected with the input end of power amplifier unit.
4. control load heating power circuit according to claim 1, is characterized in that: described power amplifier unit comprises error amplifier and power amplifier, and the output of error amplifier is connected with power amplifier input, and power amplifier output is connected with load; Error amplifier and peripheral CR oscillation circuit composition voltage negative feedback.
5. control load heating power circuit according to claim 1, is characterized in that: described follower is voltage follower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410203762.1A CN103984376A (en) | 2014-05-14 | 2014-05-14 | Circuit for controlling heating power of load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410203762.1A CN103984376A (en) | 2014-05-14 | 2014-05-14 | Circuit for controlling heating power of load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103984376A true CN103984376A (en) | 2014-08-13 |
Family
ID=51276389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410203762.1A Pending CN103984376A (en) | 2014-05-14 | 2014-05-14 | Circuit for controlling heating power of load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103984376A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106020278A (en) * | 2016-05-24 | 2016-10-12 | 中国航天科技集团公司第九研究院第七七研究所 | Precise temperature control circuit of anti-irradiation infrared detector refrigeration motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894520A (en) * | 1988-06-13 | 1990-01-16 | Westinghouse Electric Corp. | Circuit for controlling power dissipated by an electrical resistance |
| CN2145472Y (en) * | 1992-12-19 | 1993-11-03 | 季雷 | Temp. controlled power protection device |
| JPH07295659A (en) * | 1994-04-22 | 1995-11-10 | Nippon Avionics Co Ltd | Peltier element driving circuit |
| CN1645692A (en) * | 2004-12-21 | 2005-07-27 | 中国科学院上海光学精密机械研究所 | Temperature controller of small semiconductor laser |
| CN101976086A (en) * | 2010-10-29 | 2011-02-16 | 中国兵器工业集团第二一四研究所苏州研发中心 | Oxygen sensor heating control method and heating control circuit adopting same |
-
2014
- 2014-05-14 CN CN201410203762.1A patent/CN103984376A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894520A (en) * | 1988-06-13 | 1990-01-16 | Westinghouse Electric Corp. | Circuit for controlling power dissipated by an electrical resistance |
| CN2145472Y (en) * | 1992-12-19 | 1993-11-03 | 季雷 | Temp. controlled power protection device |
| JPH07295659A (en) * | 1994-04-22 | 1995-11-10 | Nippon Avionics Co Ltd | Peltier element driving circuit |
| CN1645692A (en) * | 2004-12-21 | 2005-07-27 | 中国科学院上海光学精密机械研究所 | Temperature controller of small semiconductor laser |
| CN101976086A (en) * | 2010-10-29 | 2011-02-16 | 中国兵器工业集团第二一四研究所苏州研发中心 | Oxygen sensor heating control method and heating control circuit adopting same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106020278A (en) * | 2016-05-24 | 2016-10-12 | 中国航天科技集团公司第九研究院第七七研究所 | Precise temperature control circuit of anti-irradiation infrared detector refrigeration motor |
| CN106020278B (en) * | 2016-05-24 | 2018-06-19 | 中国航天科技集团公司第九研究院第七七一研究所 | The accurate temperature controlling circuit of Flouride-resistani acid phesphatase infrared detector refrigeration motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105606882A (en) | Current sense circuit that operates over wide range of currents | |
| HRP20170389T1 (en) | Devices and methods for overvoltage protection | |
| JP2011516859A5 (en) | ||
| CN204349432U (en) | A kind of Switching Power Supply thermal-shutdown circuit | |
| CN104374983A (en) | Current monitoring circuit | |
| JP2014166135A5 (en) | ||
| CN105445673B (en) | A kind of direct current perseverance resistance electronic load device | |
| CN103441482A (en) | Current monitoring circuit with accurate current-limit function | |
| CN103208970A (en) | Gate voltage temperature compensation circuit and method of radio frequency power amplifier | |
| CN207851641U (en) | High precision temperature acquisition circuit and controller | |
| CN103954872A (en) | Transformer temperature rise measuring device and method | |
| CN205102937U (en) | Temperature transmitter with cold junction compensation | |
| CN103984376A (en) | Circuit for controlling heating power of load | |
| CN103323669B (en) | Apparatus and method for measuring resistance value | |
| CN105466460A (en) | Circuit temperature drift compensation system and method of biosensor | |
| TW201401036A (en) | CPU voltage adjustment system | |
| CN108181950B (en) | Temperature control device of high-frequency frame uncooled infrared imaging detector | |
| CN104166413A (en) | Dry type transformer temperature controller and control method thereof | |
| CN203909166U (en) | A voltage transformer temperature rise measurement apparatus | |
| CN203456860U (en) | IPM module protection circuit with adjustable current and air conditioner | |
| CN104330186B (en) | Temperature detection circuit based on transformer isolation | |
| JP2015005268A (en) | Voltage regulator | |
| CN205121401U (en) | Electric current source suitable for big current power device testing arrangement | |
| CN104748877B (en) | The linear signal Acquisition Circuit and its system of a kind of temperature sensor | |
| CN103791954A (en) | Exciter circuit of electromagnetic flowmeter and exciting current control method of exciter circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140813 |