CN201018418Y - Up-down current type AC-AC converter - Google Patents
Up-down current type AC-AC converter Download PDFInfo
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- CN201018418Y CN201018418Y CNU2007200062516U CN200720006251U CN201018418Y CN 201018418 Y CN201018418 Y CN 201018418Y CN U2007200062516 U CNU2007200062516 U CN U2007200062516U CN 200720006251 U CN200720006251 U CN 200720006251U CN 201018418 Y CN201018418 Y CN 201018418Y
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- converter
- energy storage
- rectifying circuit
- freewheeling diode
- inverter
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Abstract
本实用新型涉及一种可升降电流型AC－AC变换器，其特征在于：包括AC－DC整流电路、DC－DC变换器和DC－AC逆变器。DC－DC变换器的输入输出电感均工作在断续模式(DCM)，以获得高功率因数并降低储能电容的电压应力。该电流型AC－AC变换器可以在两级电路里实现功率因数校正、功率控制和低频逆变三种功能。减少了元器件，降低了成本，简化了电路，提高了效率。
The utility model relates to an up-down current type AC-AC converter, which is characterized in that it comprises an AC-DC rectifying circuit, a DC-DC converter and a DC-AC inverter. Both the input and output inductors of the DC-DC converter work in discontinuous mode (DCM) to obtain high power factor and reduce the voltage stress of the energy storage capacitor. The current-mode AC-AC converter can realize three functions of power factor correction, power control and low-frequency inverter in a two-stage circuit. The components and parts are reduced, the cost is reduced, the circuit is simplified, and the efficiency is improved.
Description
Technical Field
The utility model relates to a liftable current type AC-AC converter specifically relates to a can realize power factor correction, power control and low frequency contravariant current type converter in two-stage circuit.
Background
The conventional low-frequency square-wave electronic ballast has a three-stage circuit structure including a power factor correction stage, a power control stage and an inverter stage. Although the technology is mature, the circuit has the defects of complex structure, high cost, low efficiency and the like.
Disclosure of Invention
The utility model aims at providing a liftable current type AC-AC converter, this converter can realize three kinds of functions of power factor correction, power control and low frequency contravariant in the circuit of two-stage to replace traditional tertiary circuit structure.
The utility model discloses a constitute like this: the device comprises an AC-DC rectifying circuit, a DC-DC converter and a DC-AC inverter; the alternating voltage source is connected to the input end of the AC-DC rectifying circuit, the output end of the AC-DC rectifying circuit is connected with the DC-DC converter, and the output end of the DC-DC converter is connected with the DC-AC converter; the DC-DC converter consists of a BOOST converter and a BUCK BUCK converter, wherein the BOOST converter consists of an energy storage inductor L 1 Switch tube S 1 Freewheel diode D 2 And an energy storage capacitor C 1 Forming; the BUCK converter is composed of a switch tube S 1 Freewheel diode D 2 Filter inductor L 2 And a filter capacitor C 2 Forming; the positive end output of the AC-DC rectifying circuit passes through an energy storage inductor L 1 Is connected to a freewheeling diode D 2 Anode, freewheeling diode D 2 Is connected to the energy storage capacitor C 1 One terminal of (C), an energy storage capacitor 1 The other end of the AC-DC rectifying circuit is connected to the negative end of the AC-DC rectifying circuit; in the energy storage inductance L 1 And a freewheeling diode D 2 A switch tube S is connected between the connecting point of the positive pole and the negative end of the AC-DC rectifying circuit 1 (ii) a Freewheeling diode D 2 The negative pole of the filter is connected with a filter inductor L 2 Connected to a filter capacitor C 2 One terminal of (1), filter capacitor C 2 Is connected at the other end to a freewheeling diode D 2 Positive electrode and filter capacitor C 2 Both ends of the first and second switch tubes are connected in parallel with a switching tube S 2 、S 3 、S 4 、S 5 The inverter is connected with a load R.
The utility model discloses utilize the integrated principle of switch, integrated the function of BOOST converter and BUCK converter in DC-DC converter, because input inductance L 1 The electromagnetic interference is reduced, and the size of the EMI filter is reduced;output inductor L 2 The output of the current-limiting circuit can be used in an electronic ballast to realize power factor correction and output power control, output a square wave current signal, simplify the circuit topology of the electronic ballast, reduce the number and the drive of components of the circuit and improve the overall efficiency.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a circuit diagram of the DC-DC converter.
FIG. 3 shows a DC-DC converter during a switching period t 0 ～t 1 Schematic diagram of working mode at any moment.
Fig. 4 is a main waveform diagram of the DC-DC converter.
Fig. 5 is a waveform diagram of an input voltage current.
Detailed Description
The utility model discloses an AC-DC rectifier circuit, DC-DC converter and DC-AC inverter. The alternating current voltage source is connected to the input end of the AC-DC rectifying circuit, the output end of the AC-DC rectifying circuit is connected with the DC-DC switching converter, and the output end of the DC-DC converter is connected with the DC-AC converter; the DC-DC converter consists of a BOOST converter and a BUCK converter, wherein the BOOST converter consists of an energy storage inductor L 1 Switch tube S 1 Freewheel diode D 2 And an energy storage capacitor C 1 Composition is carried out; the BUCK converter is composed of a switch tube S 1 Freewheel diode D 2 Filter inductor L 2 And a filter capacitor C 2 Composition is carried out; the positive end output of the AC-DC rectifying circuit passes through an energy storage inductor L 1 Is connected to a freewheeling diode D 2 Anode, freewheeling diode D 2 Is connected to the energy storage capacitor C 1 One terminal of (C), an energy storage capacitor 1 The other end of the AC-DC rectifying circuit is connected to the negative end of the AC-DC rectifying circuit; in the energy storage inductance L 1 And a freewheeling diode D 2 Connection point of positive electrode and ACA switching tube S is connected between the negative terminals of the DC rectification circuit 1 (ii) a Freewheeling diode D 2 The negative pole of the filter is connected with a filter inductor L 2 Connected to a filter capacitor C 2 One terminal of (1), filter capacitor C 2 Is connected at the other end to a freewheeling diode D 2 Positive electrode, filter capacitor C 2 Both ends of the switch tube S are also connected in parallel with a switch tube S 2 、S 3 、S 4 、S 5 The full-bridge DC-AC inverter is formed, and a load R is connected with the inverter.
The working mode of the inductive current of the BOOST converter is a constant duty ratio intermittent mode in a steady state so as to obtain a high power factor; the working mode of the BUCK converter is a constant duty ratio intermittent mode so as to reduce the energy storage capacitor C 1 Voltage stress of (2).
The DC-AC inverter is a low-frequency full-bridge switching converter.
The operation principle of the DC-DC converter is as follows, as shown in fig. 2: the circuit is divided into the following 4 operating states within one switching cycle, as shown in fig. 3.
Mode (a): at t 0 ～t 1 At any moment, switch tube S 1 Conduction, V s By D 1 ，S 1 To the inductance L 1 Linear charge, inductance L 1 Voltage V across L1 ＝V s Inductor current i L1 Linearly increasing; energy storage capacitor C 1 Through a switching tube S 1 、C 2 &R 1amp To the inductance L 2 Linear charging, inductance L 2 Voltage V across L2 ＝V C1 -V C2 Inductor current i L2 And (4) increasing linearly. To t 1 Time, switch tube S 1 Off, the circuit enters mode (b).
Mode (b): at t 1 ～t 2 At any moment, switch tube S 1 Off, inductor current i L1 Through V s ，D 1 ，L 1 ，D 2 ，C 1 Follow current, inductance L 1 Voltage V across L1 ＝V s -V C1 Inductor current i L1 Linear decrease(ii) a Inductor current i L2 Through L 2 ，C 2 &R 1amp ，D 2 Follow current, inductance L 2 Voltage V across L2 ＝-V C2 Inductor current i L2 The linearity decreases. When the inductor current i L1 When the voltage drops to zero, the circuit enters mode (c).
Mode (c): at t 2 ～t 3 At any moment, switch tube S 1 Continues to remain off, inductor current i L1 Due to the diode D 1 Continues to remain at zero. Inductor current i L2 At negative voltage V C2 Continues to decrease linearly. When the inductor current i L2 When the voltage drops to zero, the circuit enters mode (d).
Mode (d): at t 3 ～t 4 At any moment, switch tube S 1 Keeps on turning off, the inductive current i L1 、i L2 The zero current state continues to be maintained. By a capacitor C alone 2 The load is powered until the end of a switching cycle.
When the mode (d) is finished, the circuit enters the mode (a) again, and the operation is repeated.
The main waveforms of the DC-DC converter during one switching cycle are shown in fig. 4.
The rectification circuit and the DC-DC switch converter in the utility model realize the functions of power factor correction and power control; the full-bridge inverter converts direct current into low-frequency square waves for load use.
BOOST converter inductor L for power factor correction 1 In steady state operation in discontinuous mode (DCM) with constant duty cycle, fig. 5 is an input voltage current waveform.
For the application of constant power output, in half of the power frequency period, since the input power is transient, the difference between the input power and the output power needs to be temporarily stored by the energy storage capacitor (see C in fig. 4) 1 )。
When inductance L of BUCK converter 2 When operating in continuous mode (CCM), the energy storage capacitor C 1 Will vary with input voltage and load variations. In a wide input range, the energy storage capacitor C is in light load 1 Can even reach up to kilovolts, i.e.
In order to solve the problem of overhigh voltage stress of the energy storage capacitor, an inductor L of the BUCK converter 2 Needs to work in discontinuous mode (DCM), and the energy storage capacitor C 1 At a voltage of
The output voltage of the DC-DC switching converter is
It can be seen that when R is maintained L D 2 When constant, the voltage across the storage capacitor will remain constant. While the output voltage remains constant. It can be seen that when the BOOST converter and BUCK converter inductors L 1 、L 2 The energy storage capacitor voltage and the output voltage can be kept constant under the DCM state.
Claims (3)
1. A liftable current type AC-AC converter is characterized in that: the device comprises an AC-DC rectifying circuit, a DC-DC converter and a DC-AC inverter; the alternating current voltage source is connected to the input end of the AC-DC rectifying circuit, the output end of the AC-DC rectifying circuit is connected with the DC-DC converter, and the output end of the DC-DC converter is connected with the DC-AC converter; the DC-DC converter consists of a BOOST converter and a BUCK BUCK converter, wherein the BOOST converter consists of an energy storage inductor L 1 Switch tube S 1 Freewheeling diode D 2 And an energy storage capacitor C 1 Composition is carried out; the BUCK converter is composed of a switch tube S 1 Freewheel diode D 2 Filter inductor L 2 And a filter capacitor C 2 Composition is carried out; the positive end output of the AC-DC rectification circuit passes through an energy storage inductor L 1 Is connected to a freewheeling diode D 2 Anode, freewheeling diode D 2 Is connected to the energy storage capacitor C 1 One terminal of (C), an energy storage capacitor 1 The other end of the AC-DC rectifying circuit is connected to the negative end of the AC-DC rectifying circuit; in the energy storage inductance L 1 And a freewheeling diode D 2 A switch tube S is connected between the connecting point of the anode and the negative end of the AC-DC rectifying circuit 1 (ii) a Freewheeling diode D 2 The negative pole of the filter is connected with a filter inductor L 2 Connected to a filter capacitor C 2 One terminal of (1), filter capacitor C 2 Is connected at the other end to a freewheeling diode D 2 Positive electrode, filter capacitor C 2 Both ends of the first and second switch tubes are connected in parallel with a switching tube S 2 、S 3 、S 4 、S 5 The full-bridge DC-AC inverter is formed, and a load R is connected with the inverter.
2. A liftable current type AC-AC converter according to claim 1, characterized in that: the working mode of the inductive current of the BOOST converter is a constant duty ratio discontinuous mode when the inductive current is in a steady state so as to obtain a high power factor; the working mode of the BUCK converter is a constant duty ratio intermittent mode so as to reduce the energy storage capacitor C 1 Voltage stress of (d).
3. A liftable current type AC-AC converter according to claim 1, wherein: the DC-AC inverter is a low-frequency full-bridge switching converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200062516U CN201018418Y (en) | 2007-02-02 | 2007-02-02 | Up-down current type AC-AC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200062516U CN201018418Y (en) | 2007-02-02 | 2007-02-02 | Up-down current type AC-AC converter |
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| Publication Number | Publication Date |
|---|---|
| CN201018418Y true CN201018418Y (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200062516U Expired - Fee Related CN201018418Y (en) | 2007-02-02 | 2007-02-02 | Up-down current type AC-AC converter |
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| CN (1) | CN201018418Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860230A (en) * | 2010-04-01 | 2010-10-13 | 重庆大学 | A Novel AC-DC-AC Converter and Its Control Method |
| CN101888186A (en) * | 2010-07-22 | 2010-11-17 | 魏其萃 | Isolated current-regulation heterogeneous forward direct current-direct current converter |
| CN103973127A (en) * | 2014-05-20 | 2014-08-06 | 保定优科电气科技有限责任公司 | High-voltage rotor frequency converter with single wave chopping tube |
| CN108322059A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of AC power |
| CN108923665A (en) * | 2018-06-15 | 2018-11-30 | 深圳市赛格瑞电子有限公司 | A kind of AC-AC conversion circuit and device |
-
2007
- 2007-02-02 CN CNU2007200062516U patent/CN201018418Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860230A (en) * | 2010-04-01 | 2010-10-13 | 重庆大学 | A Novel AC-DC-AC Converter and Its Control Method |
| CN101860230B (en) * | 2010-04-01 | 2012-01-11 | 重庆大学 | Novel AC-DC-AC converter and control method thereof |
| CN101888186A (en) * | 2010-07-22 | 2010-11-17 | 魏其萃 | Isolated current-regulation heterogeneous forward direct current-direct current converter |
| CN103973127A (en) * | 2014-05-20 | 2014-08-06 | 保定优科电气科技有限责任公司 | High-voltage rotor frequency converter with single wave chopping tube |
| CN108322059A (en) * | 2017-12-29 | 2018-07-24 | 河南北瑞电子科技有限公司 | A kind of AC power |
| CN108923665A (en) * | 2018-06-15 | 2018-11-30 | 深圳市赛格瑞电子有限公司 | A kind of AC-AC conversion circuit and device |
| CN108923665B (en) * | 2018-06-15 | 2023-06-27 | 深圳市赛格瑞电子有限公司 | A kind of AC-AC conversion circuit and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20110202 |