CN101170283A - A voltage self-adapted commutation circuit - Google Patents
A voltage self-adapted commutation circuit Download PDFInfo
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- CN101170283A CN101170283A CNA2007101240534A CN200710124053A CN101170283A CN 101170283 A CN101170283 A CN 101170283A CN A2007101240534 A CNA2007101240534 A CN A2007101240534A CN 200710124053 A CN200710124053 A CN 200710124053A CN 101170283 A CN101170283 A CN 101170283A
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Abstract
A voltage self-adapting rectification circuit comprises a rectification circuit, a filtration circuit, a voltage detection circuit, a MCU control unit and a control circuit. The input end of the voltage detection circuit is connected with an output end of the filtration circuit; the output end of the voltage detection circuit is connected with an input end of the MCU control unit; one output end of the MCU control unit is connected with one input end of the control circuit; the rectification circuit includes a rectification bridge stack; the filtration circuit comprises two filtration capacitors in serial connection and a control circuit includes relay; one end of the relay is connected with a power input pin on the rectification bridge stack; the other end is connected with the interface connection point between the two filtration capacitors. The invention can be used as a power source conversion circuit for a variable-frequency motor. The invention adopts a voltage detection circuit and a control circuit to identify amplitude of AC input voltage, and meanwhile, fulfill an automatic conversion rectification circuit, so that two areas with different AC input voltages can be applicable to one identical variable-frequency motor without necessity of modifying design. Therefore, the invention has the advantages of saving cost, simplifying circuits and providing reliable operation.
Description
Technical field
The present invention relates to rectification circuit, especially relate to a kind of voltage self-adapted commutation circuit.
Background technology
Existing variable-frequency motor technology is that AC power is become DC power supply, and then DC power supply is become AC power.AC power is being become in the process of DC power supply, general using be current rectifying and wave filtering circuit.For traditional rectification circuit, the interchange of different voltages input, the direct voltage that obtains is also with difference, thus the alternating voltage of the driving variable-frequency motor that obtains is also with difference.This means and to adopt different variable-frequency motors different input ac voltages.For the area of using two kinds of AC power, as the power frequency supply of 220V and 110V, need to adopt different variable-frequency motors, limited the use and the adaptability of variable-frequency motor.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above defective, proposes a kind of voltage self-adapted commutation circuit.
Another technical problem that the present invention will solve is to overcome above defective, proposes a kind of power circuit of variable-frequency motor.
This voltage self-adapted commutation circuit comprises rectification circuit and filter circuit.
The characteristics of this voltage self-adapted commutation circuit are: also comprise voltage detecting circuit, MCU control unit and control circuit; The input of described voltage detecting circuit is connected with an output of filter circuit, and the output of described voltage detecting circuit is connected with an input of MCU control unit, and an output of described MCU control unit is connected with an input of control circuit; Described rectification circuit comprises the rectifier bridge heap, described filter circuit comprises the filter capacitor (C1 of two series connection, C2), described control circuit comprises controller, one end of described controller is connected with a power supply input pin of rectifier bridge heap, (C1, intermediate connection point C2) connects for one end and two filter capacitors.
Described control circuit also comprises triode (TR1), and described controller is a relay, and described triode (TR1) is accepted the switch of the control signal control relay of MCU control unit.
Described relay is normal off relay (RY1).
Described filter circuit also comprises two groups of balance discharge equivalent resistances in parallel with filter capacitor respectively.
The power circuit of this variable-frequency motor comprises rectification circuit, filter circuit, Switching Power Supply and variable-frequency motor driver module, and the output of described Switching Power Supply is connected with the input of the input of Switching Power Supply with the variable-frequency motor driver module.
The characteristics of the power circuit of this variable-frequency motor are: also comprise voltage detecting circuit, MCU control unit and control circuit; The input of described voltage detecting circuit is connected with an output of filter circuit, the output of described voltage detecting circuit is connected with an input of MCU control unit, one output of described Switching Power Supply is connected with an output of MCU control unit, and an output of described MCU control unit is connected with an input of control circuit; Described rectification circuit comprises the rectifier bridge heap, described filter circuit comprises the filter capacitor (C1 of two series connection, C2), described control circuit comprises controller, one end of described controller is connected with a power supply input pin of rectifier bridge heap, (C1, intermediate connection point C2) connects for one end and two filter capacitors.
Described control circuit also comprises triode (TR1), and described controller is a relay, and described triode (TR1) is accepted the switch of the control signal control relay of MCU control unit.
Described filter circuit also comprises two groups of balance discharge equivalent resistances in parallel with filter capacitor respectively.
The beneficial effect that the present invention is compared with the prior art is: adopt voltage detecting circuit to differentiate the height of AC-input voltage, automatically change rectification circuit by control circuit, make the area that has two kinds of different AC-input voltage, design need not be changed and same variable-frequency motor can be used, simplify production, saved social cost; Circuit is simple, reliable operation.
Description of drawings
Fig. 1 is the circuit block diagram of the specific embodiment of the invention;
Fig. 2 is the circuit diagram of the specific embodiment of the invention.
Embodiment
The power circuit of variable-frequency motor as depicted in figs. 1 and 2 comprises rectification circuit 1, filter circuit 2, voltage detecting circuit 3, control circuit 4, MCU control unit 5, Switching Power Supply 6 and variable-frequency motor driver module 7.
The DC busbar voltage that obtains after the rectification of AC-input voltage process rectification circuit 1, filter circuit 2, the filtering divides three the tunnel to send respectively to voltage detecting circuit 3, Switching Power Supply 6 and variable-frequency motor driver module 7.Switching Power Supply 6 gives the MCU control unit 5 power supplies, voltage detecting circuit 3 feeds back to MCU control unit 5 with detected busbar voltage, 5 pairs of feedback signals of MCU control unit are judged, learn the AC-input voltage type thus, MCU control unit 5 determines whether outputting a control signal to control circuit 4 to change the rectifier system of rectification circuit 1 according to the voltage type that detects.
Rectification circuit 1 comprises the rectifier bridge heap of being made up of rectifying tube D2, D3, D4, D5, and wherein 1 pin of rectifier bridge heap and 3 pin connect the power supply input, and 2 pin and 4 pin of rectifier bridge heap connect filter circuit.
Filter circuit 2 comprises filter capacitor C1, filter capacitor C2, equivalent resistance R1 and equivalent resistance R2.Resistance R 1 and resistance R 2 are respectively the balance discharge resistance by the equivalence of several resistance.
Voltage detecting circuit 3 comprises resistance R 3, resistance R 4, resistance R 5, capacitor C 3 and diode D6.The DC busbar voltage of voltage detecting circuit 3 detection filter circuit 2 outputs is sent MCU control unit 5 with detected voltage.Wherein resistance R 4 is an equivalent resistance, can adopt a plurality of resistance in actual the use.Resistance R 5, capacitor C 3 is an anti-interference filtration.Diode D6 is a clamp diode, prevents to output to AD mouth voltage unusual too high of MCU and causes MCU to damage.
Control circuit 4 comprises triode TR1, diode D1, resistance R 6, normal off relay R Y1.The end of normal off relay R Y1 is connected with power supply input pin 3 pin of the rectifier bridge of rectification circuit 1 heap, and an end is connected the intermediate connection point of filter capacitor C1 and filter capacitor C2.Triode TR1 accept the signal of MCU control unit 5 and conducting or by, thereby the switch of control normal off relay R Y1.
For two kinds of different AC-input voltage such as 110VAC and 220VAC, the course of work of foregoing circuit is as described below.
When the variable-frequency motor parameter designing is a standard with the 220VAC AC-input voltage.For the 220VAC AC-input voltage, when supposing just to power on, ac input end A terminal voltage is for just, the B end is for negative, then rectifying tube D3 conducting, rectification filtering circuit is: ac input end A end, and------filter network---rectifying tube D5---the ac input end B that is made up of capacitor C 1, capacitor C 2, resistance R 1, resistance R 2 holds rectifying tube D3.When ac input end B terminal voltage for just, when the A end is negative, then rectifying tube D4 conducting, rectification filtering circuit is: ac input end B end, and---filter network---rectifying tube D2---the ac input end A of D4-is made up of capacitor C 1, capacitor C 2, resistance R 1, resistance R 2 holds.Like this in the very of short duration time, busbar voltage about filter circuit 2 output 310VDC, this voltage is sent Switching Power Supply 6 starting of oscillations through three the tunnel, give the MCU control unit 5 power supplies, voltage detecting circuit 3 outputs to MCU control unit 5 with detected voltage through electricity group R5.By MCU control unit 5 analysis and judgement, learn that ac input end voltage is 220VAC, then MCU control unit 5 is not exported control signal, and the normal off relay R Y1 of control circuit 4 still disconnects, and rectification circuit 1 is kept original operating state.
For the 110VAC AC-input voltage, when supposing just to power on, ac input end A terminal voltage is for just, the B end is for negative, then rectifying tube D3 conducting, rectification filtering circuit is: ac input end A end, and------filter network---rectifying tube D5---the ac input end B that is made up of capacitor C 1, capacitor C 2, resistance R 1, resistance R 2 holds rectifying tube D3.When ac input end B terminal voltage for just, when the A end is negative, then rectifying tube D4 conducting, rectification filtering circuit is: the ac input end B end---filter network that D4-is made up of capacitor C 1, capacitor C 2, resistance R 1, resistance R 2---rectifying tube D2---ac input end A end.Like this in the very of short duration time, busbar voltage about filter circuit 2 output 155VDC, this voltage is sent through three the tunnel, Switching Power Supply 6 starting of oscillations, give the MCU control unit 5 power supplies, voltage detecting circuit 3 through electricity group R5 output voltage signal AD, and send MCU control unit 5 with this signal AD with detected voltage.By MCU control unit 5 analysis and judgement, learn that input voltage is 110VAC.At this moment the DC busbar voltage that obtains is 155VDC, because the variable-frequency motor parameter designing is corresponding to 220VAC input design, 155VDC can not make this machine operation in normal condition, so MCU control unit 5 output control signal RY, the normal off relay R Y1 of control circuit 4 becomes closed by disconnecting, and then following variation takes place the operating state of rectification circuit:
When RY1 is closed, suppose that moment ac input end A terminal voltage is for just, B end is for negative, then rectifying tube D3 conducting, and rectification filtering circuit is: ac input end A end, and---normal off relay R Y1-ac input end B holds rectifying tube D3---filter network of being made up of filter capacitor C1, resistance R 1---.When ac input end B terminal voltage for just, the A end when negative, then rectifying tube D2 conducting, rectification filtering circuit is: filter network-rectifying tube D2-ac input end A of ac input end B end-normal off relay R Y1-be made up of filter capacitor C2, resistance R 2 holds.So, then rectification circuit is kept two the halfwave rectifier states that are operated in.So,, rectifier system has been become the mode of being distinguished rectification by two half-waves by original bridge rectifier mode by the control of normal off relay R Y1.The voltage that voltage after the rectification is embodied in filtering C1 and the C2 filtering superposes, the busbar voltage about filter circuit 2 output 310VDC then, provide and the identical busbar voltage of 220VAC input to variable-frequency motor equally thereby be implemented under the situation that 110VAC exchanges input, to guarantee the normal operation of motor.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations, for example the present invention can also be applied to 127V and voltage occasions such as 230V or 240V; Employed normal off relay also can use other components and parts to replace.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a voltage self-adapted commutation circuit comprises rectification circuit and filter circuit, it is characterized in that:
Also comprise voltage detecting circuit, MCU control unit and control circuit;
The input of described voltage detecting circuit is connected with an output of filter circuit, and the output of described voltage detecting circuit is connected with an input of MCU control unit, and an output of described MCU control unit is connected with an input of control circuit;
Described rectification circuit comprises the rectifier bridge heap, described filter circuit comprises the filter capacitor (C1 of two series connection, C2), described control circuit comprises controller, one end of described controller is connected with a power supply input pin of rectifier bridge heap, (C1, intermediate connection point C2) connects for one end and two filter capacitors.
2. voltage self-adapted commutation circuit as claimed in claim 1 is characterized in that:
Described control circuit also comprises triode (TR1), and described controller is a relay, and described triode (TR1) is accepted the switch of the control signal control relay of MCU control unit.
3. voltage self-adapted commutation circuit as claimed in claim 2 is characterized in that:
Described relay is normal off relay (RY1).
4. voltage self-adapted commutation circuit as claimed in claim 2 is characterized in that:
Described filter circuit also comprise two groups respectively with filter capacitor (C1, C2) in parallel balance discharge equivalent resistance (R1, R2).
5. the power circuit of a variable-frequency motor comprises rectification circuit, filter circuit, Switching Power Supply and variable-frequency motor driver module, and the output of described Switching Power Supply is connected with the input of the input of Switching Power Supply with the variable-frequency motor driver module, it is characterized in that:
Also comprise voltage detecting circuit, MCU control unit and control circuit;
The input of described voltage detecting circuit is connected with an output of filter circuit, the output of described voltage detecting circuit is connected with an input of MCU control unit, one output of described Switching Power Supply is connected with an output of MCU control unit, and an output of described MCU control unit is connected with an input of control circuit;
Described rectification circuit comprises the rectifier bridge heap, described filter circuit comprises the filter capacitor (C1 of two series connection, C2), described control circuit comprises controller, one end of described controller is connected with a power supply input pin of rectifier bridge heap, (C1, intermediate connection point C2) connects for one end and two filter capacitors.
6. the power circuit of variable-frequency motor as claimed in claim 4 is characterized in that:
Described control circuit also comprises triode (TR1), and described controller is a relay, and described triode (TR1) is accepted the switch of the control signal control relay of MCU control unit.
7. the power circuit of variable-frequency motor as claimed in claim 6 is characterized in that:
Described relay is normal off relay (RY1).
8. the power circuit of variable-frequency motor as claimed in claim 6 is characterized in that:
Described filter circuit also comprise two groups respectively with filter capacitor (C1, C2) in parallel balance discharge equivalent resistance (R1, R2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101240534A CN101170283A (en) | 2007-10-22 | 2007-10-22 | A voltage self-adapted commutation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101240534A CN101170283A (en) | 2007-10-22 | 2007-10-22 | A voltage self-adapted commutation circuit |
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| CN101170283A true CN101170283A (en) | 2008-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101240534A Pending CN101170283A (en) | 2007-10-22 | 2007-10-22 | A voltage self-adapted commutation circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378456A (en) * | 2011-11-22 | 2012-03-14 | 四川华体灯业有限公司 | System for realizing data acquisition and processing on illuminator by utilizing microcontroller |
| CN103441732A (en) * | 2013-09-10 | 2013-12-11 | 时光科技有限公司 | Refrigerator and inverter compressor controlling device thereof |
| CN104970738A (en) * | 2015-07-31 | 2015-10-14 | 苏州蓝王机床工具科技有限公司 | Power self-learning dust collector |
| CN106357128A (en) * | 2016-11-28 | 2017-01-25 | 广东美的制冷设备有限公司 | Voltage conversion control circuit and household appliance |
| CN108662572A (en) * | 2018-06-12 | 2018-10-16 | 宁波浩嘉电器有限公司 | A kind of steam vaporization mechanism adapting to Width funtion |
| CN112886838A (en) * | 2021-03-26 | 2021-06-01 | 合肥美菱物联科技有限公司 | Frequency conversion board power control circuit |
-
2007
- 2007-10-22 CN CNA2007101240534A patent/CN101170283A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378456A (en) * | 2011-11-22 | 2012-03-14 | 四川华体灯业有限公司 | System for realizing data acquisition and processing on illuminator by utilizing microcontroller |
| CN103441732A (en) * | 2013-09-10 | 2013-12-11 | 时光科技有限公司 | Refrigerator and inverter compressor controlling device thereof |
| CN104970738A (en) * | 2015-07-31 | 2015-10-14 | 苏州蓝王机床工具科技有限公司 | Power self-learning dust collector |
| CN106357128A (en) * | 2016-11-28 | 2017-01-25 | 广东美的制冷设备有限公司 | Voltage conversion control circuit and household appliance |
| CN108662572A (en) * | 2018-06-12 | 2018-10-16 | 宁波浩嘉电器有限公司 | A kind of steam vaporization mechanism adapting to Width funtion |
| CN112886838A (en) * | 2021-03-26 | 2021-06-01 | 合肥美菱物联科技有限公司 | Frequency conversion board power control circuit |
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Open date: 20080430 |