CN201557044U - Frequency limited circuit capable of controlling power factor correcting circuit via critical current - Google Patents
Frequency limited circuit capable of controlling power factor correcting circuit via critical current Download PDFInfo
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- CN201557044U CN201557044U CN2009202115362U CN200920211536U CN201557044U CN 201557044 U CN201557044 U CN 201557044U CN 2009202115362 U CN2009202115362 U CN 2009202115362U CN 200920211536 U CN200920211536 U CN 200920211536U CN 201557044 U CN201557044 U CN 201557044U
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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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Abstract
The utility model relates to a frequency limited circuit capable of controlling a power factor correcting circuit via critical current. The circuit is used to be connected with a control circuit and limit switching frequency of the control circuit, threshold values are preset inside the control circuit, the frequency limited circuit comprises a first resistor, a second resistor, a capacitor and a diode, wherein first ends of the first resistor and the capacitor are connected and grounded, a second end of the first resistor is connected with a first end of the second resistor and simultaneously connected to a second end of the capacitor and a cathode of the diode, a second end of the second resistor is connected to a zero current detecting pin of the control circuit, and an anode of the diode is connected to a driving output pin of the control circuit. The first resistor and the capacitor form a resistance-capacitance network to realize charging and discharging, and switching frequency is controlled by means of delaying charging, thereby improving efficiency and lowering switching frequency.
Description
Technical field
The utility model relates to a kind of limit frequency control circuit that is applied in the critical current power controlling factor correcting circuit, in particular to a kind of switching power circuit of realizing power factor correction.
Background technology
In throwing light on other, in the low-power applications, the circuit of power factor correction that works under the critical continuous current-mode is very common, and its control is simple, and control uses integrated circuit cheap, and the power tube switch stress is little.
Fig. 1 is a typical current type critical current power controlling factor correcting circuit functional block diagram.As shown in Figure 1, controlling schemes for general traditional current mode critical current control use, error amplifier 40 provides a predetermined error signal to reference multiplier 50, with reference to another input of multiplier 50 is the instantaneous line voltage of the interchange input after the rectification, thereby the output connection current shaping network 60 with reference to multiplier 50 is exported the sinusoidal waveform of a full-wave rectification, this waveform is as the reference of the electric current of input inductance 70, this signal is sent to an input of control logic 80 (generally being a comparator) as the reference signal, and another input of control logic 80 is received the current waveform of input inductance 70.When the power switch conducting, inductive current is linear to rise, and reaches reference signal up to signal level, control logic upset switch-off power switching tube, disconnect power tube after, inductive current is linear to descend until being zero.The voltage at zero current detection circuit 90 inductance measuring two ends, when electric current reaches after zero, the inductance both end voltage also can drop to zero, power switch conducting at this moment, circuit enters next circulation.This controlling schemes is called critical current control.
The advantage of this control is that the power switch pipe switch stress is little, the choice of diode is bigger, but shortcoming is a switching frequency to be changed along with the variation of circuit and load, frequency reaches the highest when high input voltage and underload, even within an input half cycle, switching frequency (Fsw) also changes, and please join Fig. 2.In this critical current control mode, the ON time t of switching power tube
OnUnder same AC-input voltage, fix.Account form is:
In the following formula, Pin is an input power, and L is transformer former limit inductance or booster circuit input inductance, and Vin is the input ac voltage effective value.The turn-off time t of switching power tube
OffChange, when input rectifying voltage is the highest the turn-off time the longest, be minimum at input rectifying voltage near zero crossing.So switching frequency is minimum when input rectifying voltage reaches the crest of the hill, switching frequency is the highest near voltage over zero.But too high switching frequency will cause the switching loss of power tube to increase, and the loss of inductance or transformer magnetic material increases, and efficient reduces.
The utility model then provides a kind of new circuit and is used for addressing the above problem.
The utility model content
The limit frequency circuit of the critical current power controlling factor correcting circuit that the technical problems to be solved in the utility model is to provide the highest switching frequency of a kind of restriction, reduce the switching loss of circuit, raise the efficiency.
The utility model solves above-mentioned technical problem by such technical scheme:
A kind of limit frequency circuit of critical current power controlling factor correcting circuit, this circuit is in order to connect a control circuit and to limit the switching frequency of this control circuit, predetermined threshold value in the control circuit, this limit frequency circuit comprises first resistance, second resistance, electric capacity and diode, wherein, first end of first resistance and electric capacity is connected and ground connection, first end of second termination, second resistance of first resistance, receive second end of electric capacity and the negative electrode of diode simultaneously, second of second resistance terminates to the zero current detection pin of control circuit, and the anode of diode is received the driving output pin of control circuit.
As a kind of improvement, this limit frequency circuit has three incoming ends, the driving output pin of a termination control circuit, and the zero current detection pin of a termination control circuit, an end and control circuit are altogether.
As a kind of improvement, diode is introduced drive pulse signal, and this drive pulse signal is 10V.
Compared with prior art, the utlity model has following advantage: can limit the highest switching frequency, reduce circuit switching loss, raise the efficiency.
Description of drawings
Fig. 1 is general current mode critical current power controlling factor correcting circuit functional block diagram.
Fig. 2 is the variation diagram of general current mode critical current power controlling factor correcting circuit switching frequency in an input half cycle.
Fig. 3 is the circuit diagram of the utility model critical current power controlling factor correcting circuit.
Fig. 4 is the oscillogram of the utility model critical current power controlling factor correcting circuit.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.
Fig. 3 is limit frequency circuit figure of the present utility model and its access point schematic diagram.As shown in Figure 3, the limit frequency circuit is made up of first resistance 6, second resistance 7, electric capacity 5 and diode 4.First end of first resistance 6 and electric capacity 5 is connected and ground connection, and first end of second termination, second resistance 7 of first resistance 6 is received second end of electric capacity 5 and the negative electrode of diode 4 simultaneously.The access form of limit frequency circuit is as follows, second of second resistance 7 terminates to the zero current detection pin (ZCD) of control circuit 1, the anode of diode 4 is received the driving output pin of control circuit 1, and this drives output pin by reinforced isolated gate FET 2 outputs.
Wherein, predetermined threshold value in the control circuit 1, this threshold value is used for making comparisons with the level of zero current detection pin; The effect of diode 4 is drive pulse signals of introducing about amplitude 10V, gives the resistance-capacitance network of being made up of first resistance 6 and electric capacity 5 charging during the drive pulse signal high level, and the effect of second resistance 7 is electric currents that restriction flows into control circuit 1 inside; During the drive pulse signal low level, first resistance 6 gives electric capacity 5 discharges.
Fig. 4 is an oscillogram of the present utility model.The resistance-capacitance network that first resistance 6 and electric capacity 5 are formed descends the level of the zero current detection pin of control circuit 1 and produces time-delay, and the level of zero current detection pin only drops in the control circuit 1 after the preset threshold value, new drive signal just can provide, so such scheme is actually the minimum turn-off time of having limited switching tube, thereby switching frequency is reduced, raise the efficiency.
The above only is a better embodiment of the present utility model; protection range of the present utility model does not exceed with above-mentioned execution mode; as long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection range of putting down in writing in claims.
Claims (3)
1. the limit frequency circuit of a critical current power controlling factor correcting circuit, this circuit is in order to connect a control circuit and to limit the switching frequency of this control circuit, predetermined threshold value in the control circuit, it is characterized in that: this limit frequency circuit comprises first resistance, second resistance, electric capacity and diode, wherein, first end of first resistance and electric capacity is connected and ground connection, first end of second termination, second resistance of first resistance, receive second end of electric capacity and the negative electrode of diode simultaneously, second of second resistance terminates to the zero current detection pin of control circuit, and the anode of diode is received the driving output pin of control circuit.
2. the limit frequency circuit of critical current power controlling factor correcting circuit according to claim 1, it is characterized in that: this limit frequency circuit has three incoming ends, the driving output pin of one termination control circuit, the zero current detection pin of a termination control circuit, an end and control circuit are altogether.
3. the limit frequency circuit of critical current power controlling factor correcting circuit according to claim 1 is characterized in that: diode is introduced drive pulse signal, and this drive pulse signal is 10V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202115362U CN201557044U (en) | 2009-10-30 | 2009-10-30 | Frequency limited circuit capable of controlling power factor correcting circuit via critical current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202115362U CN201557044U (en) | 2009-10-30 | 2009-10-30 | Frequency limited circuit capable of controlling power factor correcting circuit via critical current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201557044U true CN201557044U (en) | 2010-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202115362U Expired - Fee Related CN201557044U (en) | 2009-10-30 | 2009-10-30 | Frequency limited circuit capable of controlling power factor correcting circuit via critical current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201557044U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305805A (en) * | 2014-07-23 | 2016-02-03 | 通用电气照明解决方案有限公司 | Power factor correction device |
| CN109302765A (en) * | 2017-07-25 | 2019-02-01 | 欧司朗有限公司 | Driving device and lighting device for lighting device |
| US10461628B1 (en) | 2018-05-17 | 2019-10-29 | Delta Electronics, Inc. | Control circuit for outputting pulse width modulation control signal with zero-crossing detection |
| US10742113B2 (en) | 2018-05-17 | 2020-08-11 | Delta Electronics (Shanghai) Co., Ltd. | Control circuit and control method for outputting pulse width modulation control signal with zero-crossing detection |
-
2009
- 2009-10-30 CN CN2009202115362U patent/CN201557044U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305805A (en) * | 2014-07-23 | 2016-02-03 | 通用电气照明解决方案有限公司 | Power factor correction device |
| CN105305805B (en) * | 2014-07-23 | 2018-09-21 | 通用电气照明解决方案有限公司 | Power factor correcting device |
| CN109302765A (en) * | 2017-07-25 | 2019-02-01 | 欧司朗有限公司 | Driving device and lighting device for lighting device |
| CN109302765B (en) * | 2017-07-25 | 2023-05-12 | 光电子有限责任公司 | Driving device for lighting device and lighting device |
| US10461628B1 (en) | 2018-05-17 | 2019-10-29 | Delta Electronics, Inc. | Control circuit for outputting pulse width modulation control signal with zero-crossing detection |
| US10742113B2 (en) | 2018-05-17 | 2020-08-11 | Delta Electronics (Shanghai) Co., Ltd. | Control circuit and control method for outputting pulse width modulation control signal with zero-crossing detection |
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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: 20100818 Termination date: 20121030 |