CN105375789A - AC-to-DC converter - Google Patents
AC-to-DC converter Download PDFInfo
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- CN105375789A CN105375789A CN201410432734.7A CN201410432734A CN105375789A CN 105375789 A CN105375789 A CN 105375789A CN 201410432734 A CN201410432734 A CN 201410432734A CN 105375789 A CN105375789 A CN 105375789A
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- circuit
- control circuit
- voltage
- power factor
- converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Dc-Dc Converters (AREA)
Abstract
The present invention provides an AC-to-DC converter. In the AC-to-DC converter composed of a power factor improving circuit and a DC-to-DC converter, the power factor improving circuit is started firstly. Meanwhile, when DC-to-DC converter is operated at a light load, the power factor improving circuit is turned off. In this way, the efficiency is prevented from getting decreased. Therefore, the startup voltage of the power supply of the power factor improving circuit is lower than the startup voltage of the power supply of the DC-to-DC converter, so that the power factor improving circuit is turned on earlier than the DC-to-DC converter. In addition, the light load is detected and then the power factor improving circuit is turned off. As a result, the efficiency is prevented from getting decreased when the load is light. Moreover, when the DC-to-DC converter is not turned on at a specified time, the power factor improving circuit is turned off. Therefore, the unnecessary power consumption can be suppressed.
Description
Technical field
The present invention relates to the AC-DC converter with power factor correction circuit and dc-dc, especially, relate to startup and the stopping of power factor correction circuit.
Background technology
In the AC-DC converter by the voltage transitions of AC power being direct current, for suppressing the object of the high-frequency current flow through in interchange, there is power factor correction circuit, and the situation being connected with dc-dc in the rear end of power factor correction circuit is more.Power factor correction circuit is made up of boost chopper usually, is direct current by the voltage transitions of AC power, and, the electric current flow through in AC power is set to sinusoidal wave shape, carries out the improvement of power factor thus, suppress high-frequency current.Power factor correction circuit is boost chopper, and thus output voltage is high.Therefore, in order to obtain the direct voltage expected, the output of power factor correction circuit is connected with dc-dc.
Be the light hours in the output of dc-dc, the electric current flow through in AC power is less, therefore, does not need to carry out power-factor improvement.Therefore, as shown in Figure 4, propose to utilize and be arranged at the voltage produced in 3 windings of the transformer of dc-dc and carry out driving power factor and improve circuit (patent documentation 1).When dc-dc is light load, is arranged at the voltage drop produced in 3 windings of the transformer of dc-dc, therefore, this phenomenon is detected, cut off the driving power of the control circuit to power factor correction circuit.Therefore, be the light hours in dc-dc, power factor correction circuit can be made to stop, suppressing the decrease in efficiency of AC-DC converter.
At first technical literature
Patent documentation 1: Japanese Unexamined Patent Publication 08-111975 publication
Summary of the invention
The problem that invention will solve
But in the present example, started to start dc-dc before starting power factor improves circuit, therefore, the voltage putting on dc-dc is low.Therefore, flow through larger electric current in dc-dc, in addition, start-up time is elongated, therefore, sometimes poor starting occurs.Therefore, the object of the invention is to, in the AC-DC converter with power factor correction circuit and dc-dc, first starting power factor improves circuit, and, be the light hours in dc-dc, power factor correction circuit is stopped, carrying out the decline of suppression efficiency.
For solving the means of problem
In order to reach above-mentioned purpose, the feature of AC-DC converter of the present invention is to have: rectifier, and it carries out rectification to AC power; Power factor correction circuit, the output of described rectifier is converted to the 1st direct voltage by making 1st switching elements conductive/cut-off by it; Dc-dc, it makes the switching circuit conduction and cut-off be made up of the switch element of more than at least 1, from the 1st winding of transformer to the 2nd winding transferring energy, described 1st direct voltage is converted to the 2nd direct voltage; And start-up circuit, the voltage after its utilization is smoothing to the output of described rectifier charges to capacitor.
In addition, described power factor correction circuit has the 1st control circuit, 1st control circuit is according to described 1st direct voltage, conduction and cut-off control is carried out to described 1st switch element, described dc-dc has the 2nd control circuit, and the 2nd control circuit, according to described 2nd direct voltage, makes described switching circuit conduction and cut-off, described transformer has the 3rd winding, and the voltage after the 3rd winding utilizes rectification level and smooth charges to described capacitor.And the supply voltage making described 1st control circuit start action is set to lower than making described 2nd control circuit start the supply voltage of action.
When starting, described capacitor is charged by described start-up circuit, the power supply carrying out driving is provided to described 2nd control circuit, and, there is provided to described 1st control circuit the power supply carrying out driving via transistor, thus, after described power factor correction circuit starts, described dc-dc is started.
After described dc-dc starts, the power supply driving described 2nd control circuit is provided from described capacitor, and, the power supply driving described 1st control circuit is provided via described transistor, thus, described power factor correction circuit and dc-dc is made to carry out action.
In addition, described AC-DC converter also has and detects the light load testing circuit whether described dc-dc is light load, is detected as the light hours, makes described transistor cutoff at described light load testing circuit.
Described light load testing circuit can be detected by the voltage of the square wave produced in 3 windings of described transformer.
In addition, when dc-dc does not carry out action in official hour, power factor correction circuit is stopped.
Invention effect
According to the present invention, the supply voltage making the 1st control circuit start action is set to the supply voltage lower than making the 2nd control circuit start action, therefore, and power factor correction circuit startup more Zao than dc-dc.Therefore, can not there is poor starting in dc-dc.
In addition, detect light load, stop power factor correction circuit, therefore, it is possible in the decline of light hours suppression efficiency.
In addition, when dc-dc does not carry out action in official hour, power factor correction circuit is stopped, therefore, it is possible to suppress unwanted power consumption.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram that the 1st embodiment of the present invention is shown.
Fig. 2 is the circuit structure diagram that down detection circuit under the input that uses in the 1st embodiment of the present invention is shown.
Fig. 3 is the circuit structure diagram that existing example is shown.
Label declaration
1 AC power
2 rectifiers
3 reactance coils
4,8 switch elements
5,300 diodes
6,21,111,107 capacitors
7 transformers
10 loads
11,12 control circuits
100 start-up circuits
101,105,211 transistors
57,201,202,207 diodes
52,53,54,55,58 resistance
102,103,106,109 resistance
204,205,209,212 resistance
301,308 optical couplers
110,206,210 capacitors
Embodiment
[embodiment 1]
Fig. 1 shows embodiments of the invention.Rectifier 2 pairs of AC power 1 are utilized to carry out rectification.Boost chopper is made up of reactance coil 3, switch element 4, diode 5, capacitor 6, control circuit 11, and this boost chopper forms power factor correction circuit.Power factor correction circuit makes switch element 4 conduction and cut-off, generates the 1st direct voltage to capacitor 6.Control circuit 11, according to the electric current flow through in the voltage of the capacitor 6 detected by resistance 53 and resistance 54 and the switch element 4 that detected by resistance 52, makes switch element 4 conduction and cut-off.By making switch element 4 conduction and cut-off, be the 1st direct voltage by the voltage control of capacitor 6, and, make the electric current flow through in AC power become sinusoidal wave shape.
Dc-dc is made up of transformer 7, switch element 8, control circuit 12, diode 300, capacitor 21.Make switch element 8 conduction and cut-off, the 1st direct voltage is converted to the 2nd direct voltage, outputs to capacitor 21.The voltage produced in capacitor 21 detected by resistance 304 and resistance 305 is input in control circuit 12 via optical coupler 301,306.In addition, utilize the electric current flow through in resistance 58 sense switch element 8, be entered into control circuit.And then control circuit 12, according to the electric current of the 2nd direct voltage and switch element 8, makes switch element 8 conduction and cut-off.Thus, by capacitor 21 generate Voltage Cortrol be the 2nd voltage.
In addition, transformer 7 has the 3rd winding 7c, and the voltage utilizing diode 201 to produce in the 3rd winding the conduction and cut-off because of switch element 8 carries out rectification, charges to capacitor 107.The voltage of capacitor 107 is connected with the power supply terminal Vcc of control circuit 12, thus provides the driving electric power of control circuit 12.In addition, the voltage of capacitor 107 is connected via the power supply terminal Vcc of transistor 105 with capacitor 111 and control circuit 11, thus provides the driving electric power of control circuit 11.
In addition, constant-current circuit that be connected with capacitor 6, that be made up of transistor 11, resistance 102, resistance 103, Zener diode 104 constitutes when starting the start-up circuit 100 that capacitor 107 charges.
1st embodiment of such formation carries out action as follows.First, be described during startup.
When AC-DC converter is transfused to AC power 1, rectifier 2 is utilized to carry out rectification.The pulsating voltage of rectification charges via reactance coil 3 and diode 5 pairs of capacitors 6, thus is converted to direct voltage.By this direct voltage, with the constant current provided from start-up circuit 100, capacitor 107 is charged.Capacitor 107 is connected with the power supply terminal Vcc of control circuit 12.In addition, via resistance 106 and resistance 109, capacitor 110 is charged.During capacitor 110 is charged, transistor 105 conducting, utilizes the voltage of capacitor 107 to charge to capacitor 111.Capacitor 111 is connected with the power supply terminal Vcc of control circuit 11.
The power supply terminal Vcc of control circuit 11 and control circuit 12 has the lower down detection circuit of input.The lower down detection circuit of input is used for preventing control circuit generation misoperation when the voltage of power supply terminal Vcc is lower, and it is formed as shown in Figure 2.That is, compared by the voltage of comparator 502 couples of power supply terminal Vcc and reference voltage 503, make transistor 501 conduction and cut-off.When the voltage of power supply terminal Vcc is below reference voltage, transistor 501 is ended, and therefore, control circuit is failure to actuate.When the voltage of power supply terminal Vcc exceedes reference voltage, make transistor 501 conducting, be connected with the inside of control circuit, drive circuit.When the voltage of power supply terminal Vcc is greater than reference voltage 503, transistor 501 conducting, control circuit starts action.
In the 1st embodiment of the present invention, under the input of control circuit 12, down detection circuit carries out action under being set to the voltage of down detection circuit under the input higher than control circuit 11.Specifically, about the voltage of the reference voltage 503 of control circuit 12, the voltage that the conducting voltage between the voltage of the reference voltage 503 of Selection radio control circuit 11 and the collector electrode-emitter of transistor 105 is high.Thus, control circuit 11 carries out action with comparatively low supply voltage Vcc, makes power factor correction circuit startup more Zao than dc-dc.
First starting power factor improves circuit, after the boost in voltage of capacitor 6, starts dc-dc.Now, the voltage putting on dc-dc raises, and therefore dc-dc poor starting can not occur.
When dc-dc starts, in the 3rd winding, produce voltage.Utilize diode 201 to carry out rectification to this voltage, capacitor 107 is charged.The voltage of capacitor 107 is connected with the power supply terminal Vcc of control circuit 12, provides the driving electric power of control circuit 12.In addition, the voltage of capacitor 107 is connected via the power supply terminal Vcc of transistor 105 with capacitor 111 and control circuit 11.When switch element 8 ends, via diode 202, resistance 204 and resistance 205 is utilized to split the voltage produced in 3 winding 7c.Now, the voltage produced in resistance 205 is set to the voltage higher than Zener diode 207, and therefore, the voltage produced in resistance 205 charges via Zener diode 207 and resistance 208 pairs of capacitors 210.The voltage of capacitor 210 is utilized to make transistor 211 conducting.After transistor 211 conducting, transistor 105 conducting, therefore, the voltage of capacitor 107 is provided to the power supply terminal Vcc of control circuit 11 as driving electric power.Like this, after dc-dc starts, the voltage produced in 3 winding 7c is utilized to come Drive and Control Circuit 11 and control circuit 12.Now, do not need start-up circuit, the constant-current circuit of start-up circuit therefore can be made to stop.
In addition, in an embodiment of the present invention, having in dc-dc is function light hours power factor correction circuit being stopped.That is, be the light hours in dc-dc, the voltage drop produced in 3 windings when switch element 8 ends.Thus, when voltage lower than Zener diode 207 of the voltage of resistance 205, capacitor 210 does not recharge, and is discharged by resistance 209, therefore, and the voltage drop of capacitor 210.After the voltage drop of capacitor 210, transistor 211 ends, and transistor 105 ends.Therefore, the power supply terminal no longer to control circuit 11 provides electric power, and control circuit 11 stops.That is, be the light hours in dc-dc, power factor correction circuit is stopped.In addition, in the present invention, when switch element 8 ends, utilize the pulse voltage produced in 3 winding 7c to detect the light load of dc-dc, therefore, the impact that the surge voltage produced when switch element 8 conduction and cut-off causes is less.
In addition, in an embodiment of the present invention, there is the function stopping power factor correction circuit when dc-dc is not activated.That is, when starting, when the constant-current circuit of start-up circuit charges to capacitor 107, charge via resistance 106 and resistance 109 pairs of capacitors 110 simultaneously.In common startup, as above-mentioned, when dc-dc starts, transistor 211, via resistance 212, makes the series circuit short circuit of resistance 109 and capacitor 110.Therefore, transistor 105 constant conduction.But when dc-dc is not activated, capacitor 110 proceeds charging, and finally, transistor 105 ends.After transistor 105 ends, the power supply terminal Vcc no longer to control circuit 11 provides electric power, and therefore, control circuit 11 stops, and power factor correction circuit stops.That is, even if when dc-dc can not start or stop because of defencive function action because of fault, also can power factor correction circuit be stopped.The situation not making power factor correction circuit stop when dc-dc is not activated is equivalent to the situation of capacitor 110 short circuit in embodiment, but, the current charges that capacitor 107 is provided by the constant-current circuit from start-up circuit.Power factor correction circuit carries out action at this voltage.Usually, constant-current circuit is set as the electric current less than the current sinking of control circuit, and therefore, after beginning action, the voltage drop of capacitor 107 and capacitor 111, finally, drops to the control circuit voltage that action stops by input lower down detection circuit.So control circuit 11 stops action, and current sinking diminishes, start-up circuit charges to capacitor 107 and capacitor 111 again.Repeatedly carry out these actions.If the function not making power factor correction circuit stop when dc-dc does not carry out action, then no matter whether dc-dc provides output, and power factor correction circuit all repeatedly carries out startup and stops, thus consumes useless electric power.By the function stopping power factor correction circuit when dc-dc is not activated of the present invention, this useless power consumption can be avoided.
AC-DC converter of the present invention, can be set to 1 by start-up circuit, carrys out the control circuit that starting power factor improves circuit and dc-dc.Therefore, when using integrated circuit in control circuit, in any one integrated circuit, there is start-up circuit.Particularly, when there is start-up circuit in the control circuit of dc-dc, also the present invention can be applied.
Claims (4)
1. an AC-DC converter, is characterized in that, this AC-DC converter has:
Rectifier, it carries out rectification to AC power;
Power factor correction circuit, the output of described rectifier is converted to the 1st direct voltage by making 1st switching elements conductive/cut-off by it;
Dc-dc, it makes the switching circuit conduction and cut-off be made up of the switch element of more than at least 1, from the 1st winding of transformer to the 2nd winding transferring energy, described 1st direct voltage is converted to the 2nd direct voltage; And
Start-up circuit, the voltage after its utilization is smoothing to the output of described rectifier charges to capacitor,
Described power factor correction circuit has the 1st control circuit, and the 1st control circuit, according to described 1st direct voltage, carries out conduction and cut-off control to described 1st switch element,
Described dc-dc has the 2nd control circuit, and the 2nd control circuit, according to described 2nd direct voltage, makes described switching circuit conduction and cut-off,
Described transformer has the 3rd winding, and the 3rd winding utilizes the voltage smoothly to charge to described capacitor,
The supply voltage making described 1st control circuit start action is set to lower than making described 2nd control circuit start the supply voltage of action,
When starting, described capacitor is charged by described start-up circuit, the power supply carrying out driving is provided to described 2nd control circuit, and, there is provided to described 1st control circuit the power supply carrying out driving, thus, after described power factor correction circuit starts via transistor, start described dc-dc
After described dc-dc starts, provide the power supply driving described 2nd control circuit from described capacitor, and, the power supply driving described 1st control circuit is provided via transistor, thus, described power factor correction circuit and dc-dc is made to carry out action
And described AC-DC converter also has and detects the light load testing circuit whether described dc-dc is light load, is detected as the light hours, makes described transistor cutoff at described light load testing circuit.
2. AC-DC converter according to claim 1, is characterized in that,
A described transistor conducting official hour.
3. AC-DC converter according to claim 1, is characterized in that,
Described light load testing circuit detects light load by the pulse voltage produced in described 3 windings during described switching circuit cut-off.
4., according to the AC-DC converter in claims 1 to 3 described in any one, it is characterized in that,
The control circuit of described dc-dc is integrated circuit, and described start-up circuit is comprised in described integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432734.7A CN105375789A (en) | 2014-08-28 | 2014-08-28 | AC-to-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432734.7A CN105375789A (en) | 2014-08-28 | 2014-08-28 | AC-to-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105375789A true CN105375789A (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410432734.7A Pending CN105375789A (en) | 2014-08-28 | 2014-08-28 | AC-to-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105375789A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08111975A (en) * | 1994-10-11 | 1996-04-30 | Sanken Electric Co Ltd | Dc power unit |
| CN1623270A (en) * | 2002-02-08 | 2005-06-01 | 三垦电气株式会社 | Method for starting power source apparatus, circuit for starting power source apparatus, power source apparatus |
| KR101030357B1 (en) * | 2008-12-19 | 2011-04-20 | 삼성전기주식회사 | Switching mode power supply for reducing standby power |
| CN103259397A (en) * | 2012-02-17 | 2013-08-21 | Tdk株式会社 | Switching power supply device |
-
2014
- 2014-08-28 CN CN201410432734.7A patent/CN105375789A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08111975A (en) * | 1994-10-11 | 1996-04-30 | Sanken Electric Co Ltd | Dc power unit |
| CN1623270A (en) * | 2002-02-08 | 2005-06-01 | 三垦电气株式会社 | Method for starting power source apparatus, circuit for starting power source apparatus, power source apparatus |
| KR101030357B1 (en) * | 2008-12-19 | 2011-04-20 | 삼성전기주식회사 | Switching mode power supply for reducing standby power |
| CN103259397A (en) * | 2012-02-17 | 2013-08-21 | Tdk株式会社 | Switching power supply device |
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Application publication date: 20160302 |