CN205377697U - Shift circuit's control circuit - Google Patents
Shift circuit's control circuit Download PDFInfo
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- CN205377697U CN205377697U CN201521116901.3U CN201521116901U CN205377697U CN 205377697 U CN205377697 U CN 205377697U CN 201521116901 U CN201521116901 U CN 201521116901U CN 205377697 U CN205377697 U CN 205377697U
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- circuit
- power mosfet
- control circuit
- control
- phase
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Abstract
The utility model discloses a shift circuit's control circuit, including main circuit, drive circuit and control circuit, control circuit is connected with the drive circuit electricity, drive circuit is connected with the main circuit electricity, control circuit comprises comparator and AND gate circuit connection for control signal's emergence, drive circuit connects to form by keeping apart opto -coupler and amplifying device for keep apart interfering signal and enlarge control signal, the main circuit adopts and uses the single -phase fully controlled bridge formula rectifier circuit of power MOSFET as the core. The utility model discloses a power MOSFET replaces thyristor design shift circuit, and for the thyristor, power MOSFET's cost is lower, and power MOSFET belongs to voltage type control device moreover, and control circuit is also simple a lot of than the thyristor, not only can obtain the circuit result the same with the thyristor circuit, moreover can the simplified circuit, shorten the leadtime, practice thrift the cost, convenient maintenance.
Description
Technical field
This utility model relates to DC source converter technique field, particularly to the control circuit of a kind of phase-shift circuit.
Background technology
Power Electronic Technique is the electronic technology being applied to power domain, is the technology using power electronic devices electric energy to be converted and controls.Applying more in single phase rectifier circuit is single-phase full-controlled bridge phase-shifting commutation circuit, and tradition all controlled rectifier circuit adopts IGCT to be main device, wide at power rectifier applications ratio.But in some small-power occasion, employing IGCT can be higher as the cost of main device, and the lead time is long, complicated structure.
Utility model content
The purpose of this utility model is in that for the deficiencies in the prior art, the control circuit of a kind of phase-shift circuit is provided, this utility model adopts power MOSFET to replace Design of Thyristor phase-shift circuit, relative to IGCT, power MOSFET's is less costly, and power MOSFET is belonging to voltage mode control device, control circuit also than IGCT simple a lot, can not only obtain the circuit result the same with thyristor circuit, and circuit can be simplified, shorten the lead time, save cost.
For solving the problems referred to above, this utility model provides techniques below scheme:
A kind of control circuit of phase-shift circuit, including main circuit, drive circuit and control circuit, described control circuit electrically connects with drive circuit, and described drive circuit electrically connects with main circuit, described control circuit is connected to form by comparator and AND circuit, for the generation of control signal；Described drive circuit, by isolating optocoupler and amplifying device connects to form, is used for isolating interference signal and control signal being amplified；Described main circuit adopts with the power MOSFET single-phase full-controlled bridge rectification circuit being core.
Further, described control circuit includes comparator and door, potentiometer and electric capacity, and described comparator output terminal is connected with door one end, and the described comparator other end is connected with door through potentiometer, described potentiometer and and door between pass through capacity earth.
Further, described drive circuit includes isolation optocoupler and amplifying device, and the output of described isolation optocoupler is connected with voltage amplifier input, and described isolation optocoupler is TPL521.
Further, described main circuit includes power MOSFET, diode and load resistance, the source electrode of described power MOSFET is connected with diode cathode, the drain electrode of described power MOSFET is connected with diode anode, connect diode of described each power MOSFET forms single-phase full-controlled bridge rectification circuit, and described load resistance connects the output of single-phase full-controlled bridge rectification circuit.
Compared with prior art the beneficial effects of the utility model are:
This utility model adopts power MOSFET to replace Design of Thyristor phase-shift circuit, relative to IGCT, power MOSFET's is less costly, and power MOSFET is belonging to voltage mode control device, control circuit also than IGCT simple a lot, can not only obtain the circuit result the same with thyristor circuit, and circuit can be simplified, shorten the lead time, save cost, convenient for maintaining.
Accompanying drawing explanation
Fig. 1 is the system block diagram of this utility model embodiment.
Fig. 2 is the single-phase full-controlled bridge rectification circuit main circuit diagram of this utility model embodiment.
Fig. 3 is the single-phase all controlled rectifier circuit oscillogram of this utility model embodiment.
The single-phase full-controlled bridge rectification circuit control signal that Fig. 4 is this utility model embodiment produces schematic diagram.
Fig. 5 is the control circuit each point oscillogram of this utility model embodiment.
Fig. 6 is the integral control circuit figure of the single-phase full-controlled bridge rectification circuit of this utility model embodiment.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment, detailed description of the invention of the present utility model is described in further detail:
The control circuit of a kind of phase-shift circuit as shown in Figure 1, including main circuit, drive circuit and control circuit, described control circuit electrically connects with drive circuit, and described drive circuit electrically connects with main circuit, described control circuit is connected to form by comparator and AND circuit, for the generation of control signal；Described drive circuit, by isolating optocoupler and amplifying device connects to form, is used for isolating interference signal and control signal being amplified；Described main circuit adopts with the power MOSFET single-phase full-controlled bridge rectification circuit being core.
Described drive circuit includes isolation optocoupler and amplifying device, and the output of described isolation optocoupler is connected with voltage amplifier input, and described isolation optocoupler is TPL521.
As shown in Fig. 23, described main circuit includes power MOSFET, diode and load resistance, the source electrode of described power MOSFET is connected with diode cathode, the drain electrode of described power MOSFET is connected with diode anode, connect diode of described each power MOSFET forms single-phase full-controlled bridge rectification circuit, and described load resistance connects the output of single-phase full-controlled bridge rectification circuit.
Wherein Q1, Q2, Q3, Q4 are power MOSFET, and D1, D2, D3, D4 together constitute a full-controlled bridge circuit.The connect purpose of a diode of each power MOSFET is to make MOSFET become reverse blocking device, if not series diode, owing to power MOSFET has anti-paralleled diode, circuit can cause short circuit in the course of the work.
The operation principle of circuit is as follows, and circuit waveform everywhere is (in Fig. 3, M1 is the driving signal of Q1 and Q3, and M2 is the driving signal of Q2 and Q3) as shown in Figure 3:
(1) 0～ω t1: MOSFET is all without driving signal, so all in cut-off state, output voltage ud=0.
(2)ωt1～π: M1 has driving signal, so Q1 and Q4 turns on together, and output voltage udEqual to input voltage u2。
(3) π～ω t2: MOSFET is all without driving signal, so all in cut-off state, output voltage ud=0.
(4)ωt2～2 π: M2 have driving signal, so Q2 and Q3 turns on together, and output voltage udEqual to input voltage u2Reverse voltage.
From udOscillogram can be seen that, metal-oxide-semiconductor is utilized to replace IGCT, it is possible to obtain the output waveform the same with IGCT phase-shift circuit, if it is possible to accomplish the words of α adjustable angle in Fig. 3, just and the output situation of IGCT phase-shift circuit just the same, described control circuit can solve adjustable angle problem.
As shown in Fig. 45, described control circuit includes comparator and door, potentiometer and electric capacity, and described comparator output terminal is connected with door one end, and the described comparator other end is connected with door through potentiometer, described potentiometer and and door between pass through capacity earth.
The control signal of single-phase full-controlled bridge rectification circuit produces schematic diagram as shown in Figure 4.Wherein uinSignal is main circuit input signal u2Obtain through transformator, and u2Signal same frequency same phase.uinCan be obtained by required control signal with door through a comparator and one, this signal amplifies the driving signal that can serve as MOSFET and opens or turn off controlling it then through isolation, and the detailed waveform of each point of control circuit is as shown in Figure 5.
The operation principle of circuit is as follows: as input sine wave voltage uinDuring more than zero, comparator output voltage uaFor high level, on the contrary when input voltage is less than zero, output voltage is zero.Other end u with door inputbVoltage is uaVoltage, through a RC circuit, so b point signal rising edge is slowly rise, regulates RC constant, it is possible to obtain the different rise time.Adopting 74HC08 with door, input only just thinks when higher than some positive level that input is for high level, so obtaining u in Fig. 5oShown waveform.Regulate RC constant, it is possible to regulate α value, for output voltage ud, this α is equivalent to the Trigger Angle inside IGCT phase-shift circuit.This uoSignal is exactly the M1 signal in Fig. 3.M2 control signal production method is with M1 signal, and integral control circuit figure is as shown in Figure 6.
The above, it it is only preferred embodiment of the present utility model, not technical scope of the present utility model is made any restriction, therefore every any trickle amendment, equivalent variations and modification above example made according to technical spirit of the present utility model, all still fall within the scope of the technical solution of the utility model.
Claims (4)
1. the control circuit of a phase-shift circuit, including main circuit, drive circuit and control circuit, it is characterized in that: described control circuit electrically connects with drive circuit, described drive circuit electrically connects with main circuit, described control circuit is connected to form by comparator and AND circuit, for the generation of control signal；Described drive circuit, by isolating optocoupler and amplifying device connects to form, is used for isolating interference signal and control signal being amplified；Described main circuit adopts with the power MOSFET single-phase full-controlled bridge rectification circuit being core.
2. the control circuit of a kind of phase-shift circuit according to claim 1, it is characterized in that: described control circuit includes comparator and door, potentiometer and electric capacity, described comparator output terminal is connected with door one end, the described comparator other end is connected with door through potentiometer, described potentiometer and and door between pass through capacity earth.
3. the control circuit of a kind of phase-shift circuit according to claim 1, it is characterised in that: described drive circuit includes isolation optocoupler and amplifying device, and the output of described isolation optocoupler is connected with voltage amplifier input, and described isolation optocoupler is TPL521.
4. the control circuit of a kind of phase-shift circuit according to claim 1, it is characterized in that: described main circuit includes power MOSFET, diode and load resistance, the source electrode of described power MOSFET is connected with diode cathode, the drain electrode of described power MOSFET is connected with diode anode, connect diode of described each power MOSFET forms single-phase full-controlled bridge rectification circuit, and described load resistance connects the output of single-phase full-controlled bridge rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116901.3U CN205377697U (en) | 2015-12-29 | 2015-12-29 | Shift circuit's control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521116901.3U CN205377697U (en) | 2015-12-29 | 2015-12-29 | Shift circuit's control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205377697U true CN205377697U (en) | 2016-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521116901.3U Expired - Fee Related CN205377697U (en) | 2015-12-29 | 2015-12-29 | Shift circuit's control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205377697U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI699955B (en) * | 2019-08-21 | 2020-07-21 | 開曼群島商萬國半導體（開曼）股份有限公司 | Power conversion system and control method thereof |
-
2015
- 2015-12-29 CN CN201521116901.3U patent/CN205377697U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI699955B (en) * | 2019-08-21 | 2020-07-21 | 開曼群島商萬國半導體（開曼）股份有限公司 | Power conversion system and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160706 Termination date: 20161229 |