CN210225265U - Special frequency converter for fan temperature control - Google Patents
Special frequency converter for fan temperature control Download PDFInfo
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- CN210225265U CN210225265U CN201921381768.2U CN201921381768U CN210225265U CN 210225265 U CN210225265 U CN 210225265U CN 201921381768 U CN201921381768 U CN 201921381768U CN 210225265 U CN210225265 U CN 210225265U
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Abstract
The utility model relates to a converter, concretely relates to special converter of fan control by temperature change, including singlechip and input power supply, input power supply passes through rectifier module, filter module rectification filter back and sends into power distribution unit and supplies power for each consumer in the converter, the singlechip links to each other with power distribution unit, the singlechip links to each other with the IGBT contravariant module that is used for becoming alternating current power supply with direct current power supply contravariant and for the fan power supply, the singlechip links to each other with the temperature acquisition module that is used for gathering ambient temperature, IGBT contravariant module links to each other with drive module, IGBT contravariant module links to each other with the detection unit that is used for sampling and detecting the current signal of IGBT contravariant module output; the utility model provides a technical scheme can effectively overcome the driving in-process that prior art exists and do not possess output signal detection function, can not carry out temperature control's defect smoothly.
Description
Technical Field
The utility model relates to a converter, concretely relates to special converter of fan control by temperature change.
Background
Along with the continuous improvement of people's standard of living, the construction of high-end breed and high-end planting big-arch shelter is more and more, also more and more to fan temperature control system's demand. In the prior art, a temperature controller is generally adopted for start-stop control, the environmental temperature changes greatly, the speed can not be regulated, and the full-load operation can only be realized. The other solution is that the temperature controller and the frequency converter are used in combination, the system design is relatively complex, the system can not be completely suitable for market requirements, and the system does not have the function of detecting output signals.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
To the above-mentioned shortcoming that prior art exists, the utility model provides a special converter of fan control by temperature change can effectively overcome the driving in-process that prior art exists and do not possess output signal detection function, can not carry out temperature control's defect smoothly.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a special frequency converter for temperature control of a fan comprises a single chip microcomputer and an input power supply, wherein the input power supply is rectified and filtered by a rectifying module and a filtering module and then is sent to a power distribution unit to supply power to all electric equipment in the frequency converter;
the single chip microcomputer is connected with a temperature acquisition module used for acquiring the ambient temperature, the IGBT inversion module is connected with a driving module, and the IGBT inversion module is connected with a detection unit used for sampling and detecting current signals output by the IGBT inversion module.
Preferably, the power distribution unit comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the output voltage of the second secondary coil is connected to the input end of an operational amplifier in the temperature acquisition module, and the output voltage of the third secondary coil supplies power to the operational amplifier in the single chip microcomputer and the detection unit.
Preferably, a control switch Q1 is connected between the primary coil and the first secondary coil, an RCD buffer circuit for protecting the control switch Q1 is arranged in the primary coil, a pulse width modulator chip U7 is arranged in the first secondary coil, a source of the control switch Q1 is connected to a current sampling resistor R29, a drain of the control switch Q1 is connected to the RCD buffer circuit, and the pulse width modulator chip U7 is connected to a gate of the control switch Q1 through a resistor R28 and drives the control switch Q1.
Preferably, the RCD buffer circuit is a circuit formed by resistors R23 and R26, a capacitor C54, and diodes D2 and D19.
Preferably, the second secondary coil passes through an RC filter circuit formed by a rectifier diode D11, a capacitor C67 and a resistor R132 and then is connected to an input end of an operational amplifier in the temperature acquisition module after passing through a voltage stabilizer U12, the third secondary coil provides +15V for supplying power to the operational amplifier in the detection unit after passing through a rectifier diode D1, and then is sent to a voltage stabilizer U11 through a voltage dividing resistor R73 and R74 to provide +5V for supplying power to the single chip microcomputer, and the third secondary coil provides-15V for supplying power to the operational amplifier in the detection unit after passing through a rectifier diode D21.
Preferably, the temperature acquisition module comprises an operational amplifier U14B, the input end of the operational amplifier U14B is connected with a thermistor through resistors R120, R122 and R124, a voltage dividing resistor R133 and a plug connector J7, the output end of the operational amplifier U14B is connected with a voltage follower U14A, the output end of the voltage follower U14A is connected with the single chip microcomputer, and a clamping diode D4 is connected between the output end of the voltage follower U14A and the single chip microcomputer.
Preferably, the driving module includes an optocoupler TLP701, a backward diode BAW56, a series resistor connected in series with the backward diode BAW56, and a parallel resistor connected in parallel with the backward diode BAW 56.
Preferably, the detection unit includes a following module for stabilizing and transiting a preceding-stage voltage signal to a succeeding-stage voltage signal, an inverting and rectifying module for inverting and rectifying a negative half-wave into a positive voltage signal, and a quality detection module for detecting quality of a voltage signal output by the inverting and rectifying module, an output end of the IGBT inverting module is connected to an input end of the following module, an output end of the following module is connected to an input end of the inverting and rectifying module, an output end of the inverting and rectifying module is connected to an input end of the quality detection module, and an output end of the quality detection module is connected to the single chip microcomputer.
Preferably, the inverting and rectifying module includes three parallel switching diodes D28, D29, and D30, and the output terminal of the follower module is connected to the input terminals of the switching diodes D28, D29, and D30, respectively.
(III) advantageous effects
Compared with the prior art, the utility model provides a power distribution unit in the special converter of fan control by temperature change can convert input power into the required voltage of each consumer and supply power in the converter, gather external temperature information through temperature acquisition module, the output frequency of automatically regulated converter, thereby can control external temperature smoothly, detecting element can sample and detect the current signal of IGBT contravariant module output simultaneously, can be stable and whether take place to overflow and effectively judge the input current of fan.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of the system of the present invention;
FIG. 2 is a schematic circuit diagram of the power distribution unit of the present invention;
FIG. 3 is a schematic diagram of a pulse width modulator chip and its peripheral circuit in the power distribution unit circuit of the present invention;
FIG. 4 is a schematic circuit diagram of the temperature acquisition module of the present invention;
fig. 5 is a schematic circuit diagram of the driving module of the present invention;
FIG. 6 is a schematic circuit diagram of a following module in the detecting unit of the present invention;
fig. 7 is a schematic circuit diagram of a phase inversion rectifying module in the detecting unit of the present invention;
fig. 8 is a schematic circuit diagram of the quality detection module in the detection unit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A special frequency converter for temperature control of a fan is shown in figures 1 to 8 and comprises a single chip microcomputer and an input power supply, wherein the input power supply is rectified and filtered by a rectifying module and a filtering module and then is sent to a power distribution unit to supply power to all electric equipment in the frequency converter;
the single chip microcomputer is connected with a temperature acquisition module used for acquiring the ambient temperature, the IGBT inversion module is connected with the driving module, and the IGBT inversion module is connected with a detection unit used for sampling and detecting current signals output by the IGBT inversion module.
The power distribution unit comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the output voltage of the second secondary coil is connected to the input end of an operational amplifier in the temperature acquisition module, and the output voltage of the third secondary coil supplies power to the single chip microcomputer and the operational amplifier in the detection unit.
A control switch Q1 is connected between the primary coil and the first secondary coil, an RCD buffer circuit for protecting the control switch Q1 is arranged in the primary coil, a pulse width modulator chip U7 is arranged in the first secondary coil, the source electrode of the control switch Q1 is connected with a current sampling resistor R29, the drain electrode of the control switch Q1 is connected with the RCD buffer circuit, and the pulse width modulator chip U7 is connected with the gate electrode of the control switch Q1 through a resistor R28 and drives the control switch Q1.
The RCD buffer circuit is a circuit composed of resistors R23 and R26, a capacitor C54, and diodes D2 and D19.
The second secondary coil passes through an RC filter circuit consisting of a rectifier diode D11, a capacitor C67 and a resistor R132, then passes through a voltage stabilizer U12, and then is connected to the input end of an operational amplifier in the temperature acquisition module, the third secondary coil provides +15V for supplying power to the operational amplifier in the detection unit after passing through a rectifier diode D1, the third secondary coil provides +5V for supplying power to the single chip microcomputer after being sent into a voltage stabilizer U11 through a divider resistor R73 and a voltage divider R74, and the third secondary coil provides-15V for supplying power to the operational amplifier in the detection unit after passing through a rectifier diode D21.
The temperature acquisition module comprises an operational amplifier U14B, the input end of the operational amplifier U14B is connected with a voltage dividing resistor R133 and a plug connector J7 through resistors R120, R122 and R124 to form a thermistor, the output end of the operational amplifier U14B is connected with a voltage follower U14A, the output end of the voltage follower U14A is connected with a single chip microcomputer, and a clamp diode D4 is connected between the output end of the voltage follower U14A and the single chip microcomputer.
The driving module comprises an optocoupler TLP701, a backward diode BAW56, a series resistor connected in series with the backward diode BAW56, and a parallel resistor connected in parallel with the backward diode BAW 56.
The detection unit comprises a following module for enabling a preceding-stage voltage signal to be stably transited to a later stage, an inverting rectification module for inverting and rectifying negative half waves into positive voltage signals, and a quality detection module for detecting the quality of voltage signals output by the inverting rectification module, wherein the output end of the IGBT inverting module is connected with the input end of the following module, the output end of the following module is connected with the input end of the inverting rectification module, the output end of the inverting rectification module is connected with the input end of the quality detection module, and the output end of the quality detection module is connected with the single.
The inverting and rectifying module comprises three parallel switching diodes D28, D29 and D30, and the output end of the following module is respectively connected with the input ends of the switching diodes D28, D29 and D30.
The power distribution unit can be with the required voltage of each consumer in the input power source conversion converter and supply power, gather ambient temperature information through the temperature acquisition module, automatically regulated converter's output frequency to can control ambient temperature smoothly, the detecting element can sample and detect the current signal of IGBT contravariant module output simultaneously, can be stable and whether take place to overflow to the input current of fan and effectively judge.
The power distribution unit in the technical scheme of the application is an online flyback power supply, and compared with a traditional offline flyback power supply, the online flyback power supply has the characteristics of simple circuit, high dynamic response speed and the like. The rectified and filtered input power supply is in direct current connection between P + and COM, passes through voltage reduction resistors R22, R71 and R72 and then provides a first cycle power supply through a VC1 bit pulse width modulator chip UC2844, and an RCD buffer circuit formed by C54, R23, R26, D2 and D19 provides protection for a control switch 2SK 2225.
The second secondary coil passes through an RC filter circuit consisting of a rectifier diode D11, a capacitor C67 and a resistor R132 and then is powered by an operational amplifier in the temperature acquisition module after passing through a voltage stabilizer U12, the third secondary coil provides +15V for powering the operational amplifier in the detection unit after passing through a rectifier diode D1 and then is sent into a voltage stabilizer U11 through a voltage dividing resistor R73 and a voltage dividing resistor R74 and then provides +5V for powering the single chip microcomputer, and the third secondary coil provides-15V for powering the operational amplifier in the detection unit after passing through a rectifier diode D21.
The pulse width modulator chip UC2844 has an under-voltage threshold lock of 16V on and 10V off. When the power is just switched on, the voltage of UC2844 is stabilized by VD1 and is 18V to ensure that the chip works normally. When the excitation pulse applied to the primary side main power switch tube is at a high level, the switch Q1 is controlled to be conducted, the rectified direct current voltage is applied to two ends of the primary side winding, at the moment, because the secondary side winding is up-negative-down-positive, the rectifier diode is reversely biased and cut off, and the magnetic energy is stored in the primary side inductance coil of the high-frequency transformer. When the driving pulse is low level to cut off the control switch Q1, the polarity of the voltage across the primary winding is opposite, the phase of the secondary winding changes to positive, negative and positive, the rectifier diode conducts in forward bias, and then the magnetic energy stored in the transformer is transferred to the load and released.
As shown in fig. 2 and 3, the source of the control switch Q1 is connected to a current sampling resistor R29, the voltage generated by the primary inductor current of the transformer flowing through the resistor is sent to the 3 pins of UC2844 after passing through the aluminum foil, forming a current control closed loop, and when the voltage of the 3 pins exceeds 1V, the PWM latch will block the pulse, starting the overcurrent protection function for the circuit. The resistor R7 between the pin 8 and the pin 4 of the UC2844 and the grounding capacitor C10 of the pin 4 determine the oscillation frequency inside the chip, and the RCD buffer circuits (C54, R23, R26, D2 and D19) connected in parallel on the primary side of the transformer are used for limiting the peak voltage caused by the leakage inductance of the high-frequency transformer.
As shown in fig. 4, the second secondary coil passes through an RC filter circuit formed by a rectifier diode D11, a capacitor C67 and a resistor R132, and then passes through a voltage regulator U12 to supply power to an operational amplifier in the temperature acquisition module. When the plug connector J7 is connected with a 10K thermistor, the resistance value changes along with the temperature change, the voltage also changes along with the resistance change, VCC is divided by the filter voltage dividing resistors R133 and R134 of the bypass capacitor C49, the impedance is improved by the resistors R120, R122 and R124, and the voltage signal is transmitted to the operational amplifier U14B to be converted into a differential signal. U14A acts as a voltage follower and has the main effect of eliminating the high impedance created by the preceding circuit. The clamp diode BAT54S clamps the input voltage at-0.7-5.7V to protect the SCM from being burnt out. The MCU228 is adopted by the singlechip in the technical scheme of the application.
As shown in fig. 5, since zero voltage turn-off is used in the driving module, there is no negative voltage, so that the backward diode BAW56 and the series resistance are increased. When the optocoupler TLP701 outputs a high level, the backward diode BAW56 is turned off, and when the optocoupler TLP701 outputs a low level, the backward diode BAW56 is turned on, and the actual driving resistance is a parallel value of the parallel resistance R52 and the series resistance R91, so that the turn-off speed of the IGBT is increased.
As shown in fig. 6 to 8, the detection unit includes a following module for stabilizing and transiting the preceding-stage voltage signal to the subsequent stage, an inverting and rectifying module for inverting and rectifying the negative half-wave into a positive voltage signal, and a quality detection module for detecting the quality of the voltage signal output by the inverting and rectifying module, the output end of the IGBT inverting module is connected to the input end of the following module, the output end of the following module is connected to the input end of the inverting and rectifying module, the output end of the inverting and rectifying module is connected to the input end of the quality detection module, and the output end of the quality detection.
The inverting and rectifying module comprises three parallel switching diodes D28, D29 and D30, and the output end of the following module is respectively connected with the input ends of the switching diodes D28, D29 and D30.
The technical solution of the present application is only for providing a hardware configuration different from the prior art, so that the skilled person can implement further development under such a hardware configuration, and the software program can be programmed by the programmer in the field at a later stage according to the actual effect requirement.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides a special converter of fan control by temperature change which characterized in that: the power supply comprises a single chip microcomputer and an input power supply, wherein the input power supply is rectified and filtered by a rectifying module and a filtering module and then is sent to a power distribution unit to supply power to all electric equipment in a frequency converter;
the single chip microcomputer is connected with a temperature acquisition module used for acquiring the ambient temperature, the IGBT inversion module is connected with a driving module, and the IGBT inversion module is connected with a detection unit used for sampling and detecting current signals output by the IGBT inversion module.
2. The special frequency converter for fan temperature control according to claim 1, wherein: the power distribution unit comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the output voltage of the second secondary coil is connected to the input end of an operational amplifier in the temperature acquisition module, and the output voltage of the third secondary coil supplies power to the single chip microcomputer and the operational amplifier in the detection unit.
3. The special frequency converter for fan temperature control according to claim 2, wherein: be connected with control switch Q1 between primary coil, the first secondary coil, the inside RCD buffer circuit that is used for the protection of being equipped with of primary coil control switch Q1, the inside pulse width modulator chip U7 that is equipped with of first secondary coil, current sampling resistance R29 is connected to control switch Q1's source, control switch Q1's drain electrode is connected RCD buffer circuit, pulse width modulator chip U7 passes through resistance R28 and connects control switch Q1's grid and drive control switch Q1.
4. The special frequency converter for fan temperature control according to claim 3, wherein: the RCD buffer circuit is a circuit formed by resistors R23 and R26, a capacitor C54 and diodes D2 and D19.
5. The special frequency converter for fan temperature control according to claim 2, wherein: the secondary coil is connected to the input end of an operational amplifier in the temperature acquisition module after passing through an RC filter circuit composed of a rectifier diode D11, a capacitor C67 and a resistor R132 and a voltage stabilizer U12, the tertiary coil supplies +15V for power supply of the operational amplifier in the detection unit after passing through the rectifier diode D1, supplies +5V for power supply of the single chip microcomputer after being sent into a voltage stabilizer U11 through a voltage dividing resistor R73 and a R74, and supplies-15V for power supply of the operational amplifier in the detection unit after passing through the rectifier diode D21.
6. The special frequency converter for fan temperature control according to claim 1, wherein: the temperature acquisition module comprises an operational amplifier U14B, the input end of the operational amplifier U14B is connected with a voltage dividing resistor R133 and a plug connector J7 through resistors R120, R122 and R124 to form a thermistor, the output end of the operational amplifier U14B is connected with a voltage follower U14A, the output end of the voltage follower U14A is connected with the single chip microcomputer, and the output end of the voltage follower U14A is connected with a clamp diode D4 between the single chip microcomputer.
7. The special frequency converter for fan temperature control according to claim 1, wherein: the driving module comprises an optocoupler TLP701, a backward diode BAW56, a series resistor connected in series with the backward diode BAW56, and a parallel resistor connected in parallel with the backward diode BAW 56.
8. The special frequency converter for fan temperature control according to claim 1, wherein: the detection unit comprises a following module used for enabling a preceding-stage voltage signal to be stabilized and transited to a subsequent stage, an inverting rectification module used for inverting and rectifying negative half waves into a positive voltage signal, and a quality detection module used for detecting the quality of the voltage signal output by the inverting rectification module, wherein the output end of the IGBT inverting module is connected with the input end of the following module, the output end of the following module is connected with the input end of the inverting rectification module, the output end of the inverting rectification module is connected with the input end of the quality detection module, and the output end of the quality detection module is connected with the single chip microcomputer.
9. The special frequency converter for fan temperature control according to claim 8, wherein: the inverting and rectifying module comprises three parallel switching diodes D28, D29 and D30, and the output end of the following module is respectively connected with the input ends of the switching diodes D28, D29 and D30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921381768.2U CN210225265U (en) | 2019-08-23 | 2019-08-23 | Special frequency converter for fan temperature control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921381768.2U CN210225265U (en) | 2019-08-23 | 2019-08-23 | Special frequency converter for fan temperature control |
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| CN210225265U true CN210225265U (en) | 2020-03-31 |
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| CN201921381768.2U Active CN210225265U (en) | 2019-08-23 | 2019-08-23 | Special frequency converter for fan temperature control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835384A (en) * | 2021-09-30 | 2021-12-24 | 深圳市长龙铁路电子工程有限公司 | Monitoring system |
| CN115371713A (en) * | 2022-08-15 | 2022-11-22 | 安徽海尚变频技术有限公司 | Control method for improving speed regulation experience of encoder |
-
2019
- 2019-08-23 CN CN201921381768.2U patent/CN210225265U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113835384A (en) * | 2021-09-30 | 2021-12-24 | 深圳市长龙铁路电子工程有限公司 | Monitoring system |
| CN113835384B (en) * | 2021-09-30 | 2023-11-28 | 深圳市长龙铁路电子工程有限公司 | Monitoring system |
| CN115371713A (en) * | 2022-08-15 | 2022-11-22 | 安徽海尚变频技术有限公司 | Control method for improving speed regulation experience of encoder |
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Denomination of utility model: A special frequency converter for fan temperature control Effective date of registration: 20210531 Granted publication date: 20200331 Pledgee: Suzhou SME financing Company limited by guarantee Pledgor: ANHUI HAISHANG FREQUENCY CONVERSION TECHNOLOGY Co.,Ltd. Registration number: Y2021340000010 |
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