CN201365190Y - Alternating current load driving circuit with high power factor - Google Patents
Alternating current load driving circuit with high power factor Download PDFInfo
- Publication number
- CN201365190Y CN201365190Y CNU2009200016733U CN200920001673U CN201365190Y CN 201365190 Y CN201365190 Y CN 201365190Y CN U2009200016733 U CNU2009200016733 U CN U2009200016733U CN 200920001673 U CN200920001673 U CN 200920001673U CN 201365190 Y CN201365190 Y CN 201365190Y
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- feedback loop
- drive circuit
- diode
- power factor
- power
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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
-
- 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
Abstract
An alternating current load driving circuit with high power factor comprises a power element unit, a bridge type rectifying unit, a first feedback loop and a second feedback loop, wherein the first feedback loop and the second feedback loop are used for being parallelly connected with an alternating current load, the first feedback loop is connected with an alternating current power supply, and the first feedback loop and the second feedback loop are respectively provided with a transistor and a freewheel diode and alternatively act on a positive half cycle and a negative half cycle of the alternating current power supply. Signal frequency of a PWM signal source is over 20 kHz. Therefore, the alternating current load driving circuit can achieve an effect of increasing the power factor by aid of increasing the signal frequency of the PWM signal source.
Description
Technical field
The utility model is relevant with the technology that drives AC load, is meant a kind of AC load drive circuit of high power factor especially.
Background technology
In the existing Driving technique at AC load, for example 6,256, No. 211 patents of U.S. US are disclosed, promptly are a kind of technology of utilizing the bridge rectifier framework to drive AC load.Wherein, this part patent utilization PWM (pulse width modulation) comes controlling and driving power, has improved with TRIAC (bidirectional silicon-controlled body) to produce problem with AC harmonic when driving.
Yet, though having disclosed its circuit, above-mentioned patent constitutes, when not disclosing practical operation, the optimal operations state for example, does not disclose the operating frequency of its PWM.
Summary of the invention
Main purpose of the present utility model is to provide a kind of AC load drive circuit of high power factor, and it can effectively improve power factor (PF) and drive AC load.
In order to reach aforementioned purpose, AC load drive circuit according to a kind of high power factor provided by the utility model, include: a power component unit, have a power component and a power component drive circuit, wherein this power component drive circuit is connected in a PWM (pulse width modulation) signal source and is connected in this power component, drives this power component in order to the control that is subjected to this pwm signal source; One bridge rectifier unit; First feedback loop and second feedback loop, in order to be parallel to an AC load, this first feedback loop is connected in second end of an AC power, and this first and second feedback loop has a transistor and a fly-wheel diode respectively, and this first and second feedback loop alternatively acts on the positive half cycle and the negative half period of this AC power; First end of this second feedback loop and this AC power is connected in the opposite end of this bridge rectifier unit, and this power component and an earth terminal are connected in the opposite end in addition of this bridge rectifier unit; Wherein, the signal frequency in this pwm signal source is more than 20kHz (20 kilo hertzs).For this reason, can reach the effect that improves power factor (PF) by the signal frequency that improves this pwm signal source.
Description of drawings
Fig. 1 is the circuit structure diagram of first preferred embodiment of the AC load drive circuit of the utility model high power factor.
Fig. 2 is the circuit structure diagram of second preferred embodiment of the AC load drive circuit of the utility model high power factor.
Embodiment
In order to describe characteristics of the present utility model place in detail, lift following preferred embodiment now and cooperate graphic explanation as after, wherein:
As shown in Figure 1, the AC load drive circuit 10 of a kind of high power factor that the utility model first preferred embodiment is provided, mainly formed by a filter unit 11, a power component unit 21, a bridge rectifier unit 31, first feedback loop 41, second feedback loop 51, wherein:
This filter unit 11 is connected in first end and second end 12,13 of an AC power, in order to remove the noise of AC power electromagnetic interference.
This power component unit 21, have a power component 22 and a power component drive circuit 24, wherein this power component drive circuit 24 is connected in a PWM (pulse width modulation) signal source 26 and is connected in this power component 22, drives this power component 22 in order to the control that is subjected to this pwm signal source 26.
This first feedback loop 41 and this second feedback loop 51, in order to be parallel to an AC load 91, this AC load 91 is example in the present embodiment with the motor.This first and second feedback loop 41,51 has a transistor Q1 respectively, a Q2 and a sustained diode 1, D2, this first and second feedback loop 41,51 alternatively acts on the positive half cycle and the negative half period of AC power, wherein, this two-transistor Q1, Q2 are power npn transistor.The emitter-base bandgap grading of the transistor Q1 of this first feedback loop 41 is connected in the sustained diode 2 of this second feedback loop 51; The emitter-base bandgap grading of the transistor Q2 of this second feedback loop 51 is connected in the sustained diode 1 of this first feedback loop 41.This second feedback loop 51 and this filter unit 11 are connected in the opposite end of this bridge rectifier unit 31, and this power component 22 and an earth terminal GND are connected in the opposite end in addition of this bridge rectifier unit 31.
Wherein, the signal frequency in this pwm signal source 26 is between 20kHz-400kHz.In addition, this sustained diode 1 respectively, D2 uses quick revovery diode.
The flowing mode of doing of this first embodiment below is described.
As shown in Figure 1, the alternating current that AC power provided enters this bridge rectifier unit 31 via the filtering of this filter unit 11.And simultaneously,, make this power component drive circuit 24 drive these power components 22, and then control the rectification state of this bridge rectifier unit 31 at 62kHz by the signal frequency in this pwm signal source 26 of control.
Power supply after 31 rectifications in this bridge rectifier unit enters this first feedback loop 41 and this second feedback loop 51, opens this two-transistor Q1, Q2 respectively with its forward bias voltage drop when the positive half wave of power supply and negative half-wave.
Wherein, when the state of electric current positive half wave pwm signal ON, electric current enters emitter-base bandgap grading by the base stage of the first transistor Q1, and enters this AC load 91.
When electric current is born half-wave, then operate by another feedback loop (i.e. second feedback loop 51), be analogous to the action of the first above-mentioned feedback loop, therefore repeat no more.
Please consult Fig. 2 again, the AC load drive circuit 60 of a kind of high power factor that the utility model second preferred embodiment is provided is taken off first embodiment before mainly generally being same as, and difference is:
This first feedback loop further has: diode D3, one first capacitor C 1 and two first diode D5, D6.
This second feedback loop further has: diode D4, one second capacitor C 2 and two second diode D7, D8.
Wherein, these first capacitor C, 1 two ends are connected to base stage and the emitter-base bandgap grading of this first transistor Q1.These second capacitor C, 2 two ends are connected to base stage and the emitter-base bandgap grading of this transistor seconds Q2.
These two first diode D5, D6 is one another in series, and is parallel to the diode D3 of this first feedback loop 41 again, and is parallel to this first capacitor C 1.These two second diode D7, D8 is one another in series, and is parallel to the diode D4 of this second feedback loop 51 again, and is parallel to this second capacitor C 2.
The mode of operation of this second embodiment is described as follows:
Wherein, when the state of electric current positive half wave pwm signal ON, electric current is by these two first diode D5, and D6 is via this AC load 91, and flowed out by the diode D4 of this second feedback loop 51; And during the state of pwm signal OFF, because this first capacitor C, 1 discharge is kept this transistor Q1 and opened, electric current is by these two first diode D5, D6 is via this AC load 91, through this sustained diode 1 and this transistor Q1, form freewheel current again, therefore do not have the generation of AC harmonic.
When the negative half-wave of electric current, then by another to diode (i.e. this two second diode D7, D8) and another feedback loop (i.e. second feedback loop 51) this sustained diode 2 of arranging in pairs or groups operate.
Can understand by above-mentioned two disclosed technology of embodiment, the utility model is except the harmonic wave that can reduce this AC load 91, by the frequency that improves pwm signal source 26, can utilize high-frequency drive to reach the actual loading terminal voltage and be in quite approaching phase place mutually with electric current, and then can draw high power factor (PF), reach high efficiency effect.With this case pwm signal frequency is 62kHz, its power factor (PF) can reach 0.97, has been in close proximity to 1.In addition, if when the pwm signal frequency is 40kHz, then its power factor (PF) can reach 0.92, also is quite to approach 1.
As from the foregoing, the effect that the utility model can be reached is, can improve power factor (PF), its Mainly be that the frequency that sees through the control pwm signal is reached.
Claims (8)
1. the AC load drive circuit of a high power factor is characterized in that, includes:
One power component unit has a power component and a power component drive circuit, and wherein this power component drive circuit is connected in a pwm signal source and is connected in this power component, drives this power component in order to the control that is subjected to this pwm signal source;
One bridge rectifier unit;
First feedback loop and second feedback loop, in order to be parallel to an AC load, this first feedback loop is connected in second end of an AC power, and this first and second feedback loop has a transistor and a fly-wheel diode respectively, and this first and second feedback loop alternatively acts on the positive half cycle and the negative half period of this AC power; First end of this second feedback loop and this AC power is connected in the opposite end of this bridge rectifier unit, and this power component and an earth terminal are connected in the opposite end in addition of this bridge rectifier unit;
The signal frequency in this pwm signal source is more than 20kHz.
2. the AC load drive circuit of high power factor according to claim 1, it is characterized in that: the signal frequency in this pwm signal source is between 20kHz-400kHz.
3. the AC load drive circuit of high power factor according to claim 1, it is characterized in that: the transistor of this first feedback loop and this second feedback loop is a power npn transistor.
4. the AC load drive circuit of high power factor according to claim 1, it is characterized in that: this first feedback loop and this second feedback loop include a diode respectively.
5. the AC load drive circuit of high power factor according to claim 4, it is characterized in that: this first feedback loop and this second feedback loop include at least one first diode and at least one second diode respectively, this first diode is parallel to the diode of this first feedback loop, and this second diode is parallel to the diode of this second feedback loop.
6. the AC load drive circuit of high power factor according to claim 4, it is characterized in that: this first feedback loop and this second feedback loop include one first electric capacity and one second electric capacity respectively.
7. the AC load drive circuit of high power factor according to claim 1, it is characterized in that: the transistor of this first feedback loop is connected in the fly-wheel diode of this second feedback loop; The transistor of this second feedback loop is connected in the fly-wheel diode of this first feedback loop.
8. the AC load drive circuit of high power factor according to claim 1, it is characterized in that, also include: a filter unit is connected between this AC power and this bridge rectifier unit and this first feedback loop, in order to remove the noise of AC power electromagnetic interference; This filter unit is connected in first end and second end of this AC power, and is connected in this bridge rectifier unit and this first feedback loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200016733U CN201365190Y (en) | 2009-01-13 | 2009-01-13 | Alternating current load driving circuit with high power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200016733U CN201365190Y (en) | 2009-01-13 | 2009-01-13 | Alternating current load driving circuit with high power factor |
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| Publication Number | Publication Date |
|---|---|
| CN201365190Y true CN201365190Y (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200016733U Expired - Fee Related CN201365190Y (en) | 2009-01-13 | 2009-01-13 | Alternating current load driving circuit with high power factor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783514A (en) * | 2010-03-09 | 2010-07-21 | 李香龙 | Correction method and circuit of AC load power factor |
-
2009
- 2009-01-13 CN CNU2009200016733U patent/CN201365190Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783514A (en) * | 2010-03-09 | 2010-07-21 | 李香龙 | Correction method and circuit of AC load power factor |
| CN101783514B (en) * | 2010-03-09 | 2013-04-03 | 河北工业大学 | Correction method and circuit of AC load power factor |
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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: 20091216 Termination date: 20140113 |