TWI382626B - Discharge circuit - Google Patents
Discharge circuit Download PDFInfo
- Publication number
- TWI382626B TWI382626B TW098134295A TW98134295A TWI382626B TW I382626 B TWI382626 B TW I382626B TW 098134295 A TW098134295 A TW 098134295A TW 98134295 A TW98134295 A TW 98134295A TW I382626 B TWI382626 B TW I382626B
- Authority
- TW
- Taiwan
- Prior art keywords
- type triode
- resistor
- pnp
- discharge
- circuit
- Prior art date
Links
Classifications
-
- 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
Description
本發明涉及一種放電電路，尤其涉及一種消耗功率較小且放電時間可調節的自動高壓放電電路。The invention relates to a discharge circuit, in particular to an automatic high-voltage discharge circuit with low power consumption and adjustable discharge time.
驅動電路主要用來將輸入的直流電壓，作電壓位元准的調節，並使其穩定在所設定的一電壓值，其利用驅動上橋及下橋功率元件的切換而產生脈波，此脈波經過電感電容組成的低通濾波器後產生穩定的直流電壓，以供給各種電子產品，具體請參閱Volkan Kursun等人2004年在IEEE系統中發表的“HIGH INPUT VOLTAGE STEP-DOWN DC-DC CONVERTERS FOR INTEGRATION IN A LOW VOLTAGE CMOS PROCESS”一文。The driving circuit is mainly used for adjusting the input DC voltage as a voltage bit and stabilizing it at a set voltage value, which generates a pulse wave by switching between the upper bridge and the lower bridge power component. The wave passes through a low-pass filter composed of an inductor and a capacitor to generate a stable DC voltage for supply to various electronic products. For details, please refer to "HIGH INPUT VOLTAGE STEP-DOWN DC-DC CONVERTERS FOR" published by Volkan Kursun et al. INTEGRATION IN A LOW VOLTAGE CMOS PROCESS" article.
在驅動電路中，一般需要增加一個功率因素校正電路(Power Factor Corrector,PFC)，用以改變輸入電流的波形與相角，修正電流中的高次諧波。具體地，該功率因素校正電路包括一個濾波電容，以通過該濾波電容有效地修正電流中的高次諧波。該濾波電容的大小取決於負載的大小，負載越大，該濾波電容也就越大。In the driver circuit, it is generally necessary to add a Power Factor Corrector (PFC) to change the waveform and phase angle of the input current and correct the higher harmonics in the current. Specifically, the power factor correction circuit includes a filter capacitor to effectively correct higher harmonics in the current through the filter capacitor. The size of the filter capacitor depends on the size of the load. The larger the load, the larger the filter capacitor.
當電源接通時，負載正常工作，該濾波電容可有效地修正電流中的高次諧波，同時，該濾波電容將儲存電能。然而，當電源斷開時，負載停止工作，儲存在該濾波電容中的電能並不能通過負載釋放，而需通過自然放電將儲存在該濾波電容中的電能釋放，其放電時間較長，容易出現高壓觸電。為避免高壓觸電危險，一般利用電阻將儲存在該濾波電容內的高壓釋放掉。且為了避免消耗過多功率，而選用大電阻對該濾波電容進行放電。但是，選用大電阻放電，其放電時間較長，以致儲存在該濾波電容中的電壓儲存時間較長，仍可能導致高壓觸電危險。When the power is turned on, the load works normally. The filter capacitor can effectively correct the higher harmonics in the current. At the same time, the filter capacitor will store the power. However, when the power is turned off, the load stops working, and the electric energy stored in the filter capacitor cannot be released through the load, but the electric energy stored in the filter capacitor is released by natural discharge, and the discharge time is long and easy to appear. High voltage electric shock. In order to avoid the danger of high voltage electric shock, the high voltage stored in the filter capacitor is generally released by a resistor. In order to avoid consuming too much power, a large resistor is used to discharge the filter capacitor. However, when a large resistance discharge is selected, the discharge time is long, so that the voltage stored in the filter capacitor is stored for a long time, which may still cause a high voltage electric shock hazard.
有鑒於此，有必要提供一種消耗功率較小且放電時間可調節的放電電路。In view of this, it is necessary to provide a discharge circuit that consumes less power and has an adjustable discharge time.
下面將以實施例說明一種消耗功率較小且放電時間可以調節的自動高壓放電電路。An automatic high voltage discharge circuit that consumes less power and can adjust the discharge time will be described below by way of example.
一種放電電路，其與功率因素校正電路的輸出端電連接，且該功率因素校正電路的輸出端定義為第一節點，該功率因素校正電路中具有一個濾波電容。該放電電路包括一個控制單元以及一個放電單元。該控制單元包括一個NPN型三極體，一個第一PNP型三極體以及一個第一電阻。該第一NPN型三極體的基極與一個外接電壓電連接，其發射極接地，其集電極與該第一PNP型三極體的基極電連接，該第一PNP型三極體的發射極與該第一節點電連接，其集電極通過該第一電阻接地。該放電單元包括一個第二PNP型三極體以及一個放電電阻，該第二PNP型三極體的基極與該第一PNP型三極體的集電極電連接，其發射極通過該放電電阻與該第一節點電連接，其集電極接地。A discharge circuit electrically connected to an output of the power factor correction circuit, and an output of the power factor correction circuit is defined as a first node, the power factor correction circuit having a filter capacitor. The discharge circuit includes a control unit and a discharge unit. The control unit includes an NPN type triode, a first PNP type triode and a first resistor. The base of the first NPN-type triode is electrically connected to an external voltage, the emitter thereof is grounded, and the collector is electrically connected to the base of the first PNP-type triode. The first PNP-type triode is electrically connected. The emitter is electrically connected to the first node, and the collector is grounded through the first resistor. The discharge unit includes a second PNP-type triode and a discharge resistor, and a base of the second PNP-type triode is electrically connected to a collector of the first PNP-type triode, and an emitter thereof passes through the discharge resistor It is electrically connected to the first node, and its collector is grounded.
相對於先前技術，當電路接通時，該功率因素校正電路正常工作，該濾波電容用於濾除電源電路中的高次諧波，並儲存電能。該NPN型三極體的基極外接電壓而導通，其集電極電壓趨近零，該第一PNP型三極體導通，該第一PNP型三極體的集電極電壓接近於第一節點電壓，從而使該第二PNP型三極體截止，因此，該放電電路消耗功率較小。當電路斷開時，該NPN型三極體與該該第一PNP型三極體截止，該第二PNP型三極體導通，從而使儲存在該濾波電容中的電能通過該放電單元自動進行放電，以避免高壓觸電危險。並且可以通過調節該放電電阻的阻值大小調節放電時間，實現快速放電目地。In contrast to the prior art, the power factor correction circuit operates normally when the circuit is turned on, and the filter capacitor is used to filter out higher harmonics in the power supply circuit and store electrical energy. The base of the NPN-type triode is externally connected to a voltage, and its collector voltage approaches zero. The first PNP-type triode is turned on, and the collector voltage of the first PNP-type triode is close to the first node voltage. Therefore, the second PNP type triode is turned off, and therefore, the discharge circuit consumes less power. When the circuit is disconnected, the NPN-type triode is turned off and the first PNP-type triode is turned off, and the second PNP-type triode is turned on, so that the electric energy stored in the filter capacitor is automatically performed by the discharge unit. Discharge to avoid the risk of high voltage electric shock. And the discharge time can be adjusted by adjusting the resistance value of the discharge resistor to achieve a rapid discharge target.
下面將結合附圖對本發明實施方式作進一步的詳細說明。The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
請參見圖1，本發明實施例提供的一種放電電路10，其並聯於功率因素校正電路20與負載之間。具體地，該功率因素校正電路20的輸入端Vin與電源輸出端電連接，該功率因素校正電路20的輸出端定義為第一節點A。該功率因素校正電路20中具有一個濾波電容21，其用於濾除電源電流中的高次諧波。Referring to FIG. 1, a discharge circuit 10 according to an embodiment of the present invention is connected in parallel between a power factor correction circuit 20 and a load. Specifically, the input terminal Vin of the power factor correction circuit 20 is electrically connected to the power output terminal, and the output terminal of the power factor correction circuit 20 is defined as the first node A. The power factor correction circuit 20 has a filter capacitor 21 for filtering out higher harmonics in the supply current.
該放電電路10包括一個控制單元30以及一個放電單元40。The discharge circuit 10 includes a control unit 30 and a discharge unit 40.
該控制單元30包括一個NPN型三極體31，一個第一PNP型三極體32以及一個第一電阻33。優選地，該控制單元30進一步包括一個分壓電路34以及一個穩壓電路35。The control unit 30 includes an NPN type triode 31, a first PNP type triode 32 and a first resistor 33. Preferably, the control unit 30 further includes a voltage dividing circuit 34 and a voltage stabilizing circuit 35.
該分壓電路34包括一個第二電阻341與一個第三電阻342。該第二電阻341的兩端分別與該NPN型三極體31的基極以及外接電壓電連接，該第三電阻342的一端與該NPN型三極體31的基極電連接，另一端接地。在本實施例中，該外接電壓VDD為功率因素校正電路20輸出的一個15伏左右的輔助電壓，當功率因素校正電路20斷開時，該外接電壓VDD斷開，即為0伏。The voltage dividing circuit 34 includes a second resistor 341 and a third resistor 342. The two ends of the second resistor 341 are electrically connected to the base of the NPN-type triode 31 and the external voltage. One end of the third resistor 342 is electrically connected to the base of the NPN-type triode 31, and the other end is grounded. . In the present embodiment, the external voltage VDD is an auxiliary voltage of about 15 volts output by the power factor correction circuit 20. When the power factor correction circuit 20 is turned off, the external voltage VDD is turned off, that is, 0 volt.
該NPN型三極體31的發射極接地，其集電極通過一個第四電阻36與該第一PNP型三極體的基極電連接。The emitter of the NPN-type triode 31 is grounded, and its collector is electrically connected to the base of the first PNP-type triode through a fourth resistor 36.
該穩壓電路35包括一個第五電阻351以及一個與該第五電阻351電連接的第一穩壓二極體352。The voltage stabilizing circuit 35 includes a fifth resistor 351 and a first stabilizing diode 352 electrically connected to the fifth resistor 351.
該第一PNP型三極體32的發射極通過該穩壓電路35與第一節點A電連接，並且，該第一穩壓二極體352的正極與該第一PNP型三極體32的發射極電連接。該第一PNP型三極體32的集電極通過該第一電阻33接地。The emitter of the first PNP-type triode 32 is electrically connected to the first node A through the voltage stabilizing circuit 35, and the anode of the first stabilizing diode 352 and the first PNP-type triode 32 The emitter is electrically connected. The collector of the first PNP-type triode 32 is grounded through the first resistor 33.
該放電單元40包括一個第二PNP型三極體41以及一個放電電阻42。該第二PNP型三極體41的基極通過一個第二穩壓二極體43與該第一PNP型三極體32的集電極電連接。該第二PNP型三極體41集電極接地，其發射極通過該放電電阻42與該第一節點A電連接。優選地，該第二PNP型三極體41的發射極與該放電電阻42之間設置有一個第三穩壓二極體44。The discharge unit 40 includes a second PNP type triode 41 and a discharge resistor 42. The base of the second PNP-type triode 41 is electrically connected to the collector of the first PNP-type triode 32 via a second Zener diode 43. The collector of the second PNP-type triode 41 is grounded, and the emitter thereof is electrically connected to the first node A through the discharge resistor 42. Preferably, a third stabilizing diode 44 is disposed between the emitter of the second PNP-type triode 41 and the discharge resistor 42.
當電路接通時，該功率因素校正電路20正常工作，該濾波電容21用於濾除電源電路中的高次諧波，並儲存電能。外接電壓接通，該NPN型三極體31的基極電壓高於其發射極電壓，該NPN型三極體31導通，該NPN型三極體31的集電極電壓趨近於零。該第一PNP型三極體32的發射極電壓高於其基極電壓，因此，該第一PNP型三極體32導通。該第二PNP型三極體41的集電極電壓與其基極電壓基本相等，該第二PNP型三極體41截止，因此，該放電電路消耗功率較小。The power factor correction circuit 20 operates normally when the circuit is turned on, and the filter capacitor 21 is used to filter out higher harmonics in the power circuit and store the power. The external voltage is turned on, the base voltage of the NPN type triode 31 is higher than its emitter voltage, the NPN type triode 31 is turned on, and the collector voltage of the NPN type triode 31 approaches zero. The emitter voltage of the first PNP-type triode 32 is higher than its base voltage, and therefore, the first PNP-type triode 32 is turned on. The collector voltage of the second PNP-type triode 41 is substantially equal to its base voltage, and the second PNP-type triode 41 is turned off. Therefore, the discharge circuit consumes less power.
反之，當電路斷開時，該功率因素校正電路20斷開。該NPN型三極體31與該該第一PNP型三極體32截止，該第二PNP型三極體41導通，從而使儲存在該濾波電容21中的電能通過該放電單元40自動進行放電，以避免高壓觸電危險。Conversely, when the circuit is turned off, the power factor correction circuit 20 is turned off. The NPN-type triode 31 and the first PNP-type triode 32 are turned off, and the second PNP-type triode 41 is turned on, so that the electric energy stored in the filter capacitor 21 is automatically discharged through the discharge unit 40. To avoid the danger of high voltage electric shock.
該放電電路10用於釋放儲存在該濾波電容21中的電能，其放電快慢取決於該放電電阻42的大小。具體地，該放電電阻42越大，放電越慢，放電時間越長，反之，該放電電阻42越小，放電越快，放電時間越短。The discharge circuit 10 is for discharging the electric energy stored in the filter capacitor 21, and the discharge speed depends on the size of the discharge resistor 42. Specifically, the larger the discharge resistor 42, the slower the discharge, and the longer the discharge time. Conversely, the smaller the discharge resistor 42, the faster the discharge, and the shorter the discharge time.
該放電電路10結構簡單，消耗功率較小，並可以自動將儲存在濾波電容21中的電能釋放，以避免高壓觸電危險。並且，該放電電路10可以通過調節該放電電阻42的阻值大小調節放電時間，實現快速放電目地。The discharge circuit 10 has a simple structure, consumes less power, and can automatically release the electric energy stored in the filter capacitor 21 to avoid the danger of high voltage electric shock. Moreover, the discharge circuit 10 can adjust the discharge time by adjusting the resistance value of the discharge resistor 42 to achieve a rapid discharge target.
另外，本領域技術人員還可於本發明精神內做其他變化用於本發明的設計，只要其不偏離本發明的技術效果均可。這些依據本發明精神所做的變化，都應包含在本發明所要求保護的範圍之內。Further, those skilled in the art can make other variations within the spirit of the invention for the design of the present invention as long as it does not deviate from the technical effects of the present invention. All changes made in accordance with the spirit of the invention are intended to be included within the scope of the invention.
10．．．放電電路10. . . Discharge circuit
20．．．功率因素校正電路20. . . Power factor correction circuit
21．．．濾波電容twenty one. . . Filter capacitor
30．．．控制單元30. . . control unit
40．．．放電單元40. . . Discharge unit
31．．．NPN型三極體31. . . NPN type triode
32、41．．．PNP型三極體32, 41. . . PNP type triode
33．．．第一電阻33. . . First resistance
34．．．分壓電路34. . . Voltage dividing circuit
35．．．穩壓電路35. . . Regulator circuit
341．．．第二電阻341. . . Second resistance
342．．．第三電阻342. . . Third resistance
36．．．第四電阻36. . . Fourth resistor
351．．．第五電阻351. . . Fifth resistor
352．．．第一穩壓二極體352. . . First regulator diode
42．．．放電電阻42. . . Discharge resistor
43．．．第二穩壓二極體43. . . Second regulator diode
44．．．第三穩壓二極體44. . . Third regulator diode
圖1是本發明實施例提供的放電電路的電路示意圖。1 is a circuit diagram of a discharge circuit according to an embodiment of the present invention.
10．．．放電電路10. . . Discharge circuit
20．．．功率因素校正電路20. . . Power factor correction circuit
21．．．濾波電容twenty one. . . Filter capacitor
30．．．控制單元30. . . control unit
40．．．放電單元40. . . Discharge unit
31．．．NPN型三極體31. . . NPN type triode
32、41．．．PNP型三極體32, 41. . . PNP type triode
33．．．第一電阻33. . . First resistance
34．．．分壓電路34. . . Voltage dividing circuit
35．．．穩壓電路35. . . Regulator circuit
341．．．第二電阻341. . . Second resistance
342．．．第三電阻342. . . Third resistance
36．．．第四電阻36. . . Fourth resistor
351．．．第五電阻351. . . Fifth resistor
352．．．第一穩壓二極體352. . . First regulator diode
42．．．放電電阻42. . . Discharge resistor
43．．．第二穩壓二極體43. . . Second regulator diode
44．．．第三穩壓二極體44. . . Third regulator diode
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW098134295A TWI382626B (en) | 2009-10-09 | 2009-10-09 | Discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW098134295A TWI382626B (en) | 2009-10-09 | 2009-10-09 | Discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201114142A TW201114142A (en) | 2011-04-16 |
| TWI382626B true TWI382626B (en) | 2013-01-11 |
Family
ID=44909923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW098134295A TWI382626B (en) | 2009-10-09 | 2009-10-09 | Discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI382626B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6949885B2 (en) * | 2003-04-22 | 2005-09-27 | Matsushita Electric Works, Ltd. | Discharge lamp lighting device and lighting apparatus |
| TW200847601A (en) * | 2007-05-30 | 2008-12-01 | Matritek Inc | Power supply device and electronic apparatus |
| US7479744B2 (en) * | 2004-06-24 | 2009-01-20 | Stmicroelectronics S.A. | Power dimmer |
| TW200937165A (en) * | 2007-11-26 | 2009-09-01 | Koninkl Philips Electronics Nv | Power factor control circuit and mains power supply |
| TW200942076A (en) * | 2008-01-29 | 2009-10-01 | Koninkl Philips Electronics Nv | Electronic driver circuit and method |
-
2009
- 2009-10-09 TW TW098134295A patent/TWI382626B/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6949885B2 (en) * | 2003-04-22 | 2005-09-27 | Matsushita Electric Works, Ltd. | Discharge lamp lighting device and lighting apparatus |
| US7479744B2 (en) * | 2004-06-24 | 2009-01-20 | Stmicroelectronics S.A. | Power dimmer |
| TW200847601A (en) * | 2007-05-30 | 2008-12-01 | Matritek Inc | Power supply device and electronic apparatus |
| TW200937165A (en) * | 2007-11-26 | 2009-09-01 | Koninkl Philips Electronics Nv | Power factor control circuit and mains power supply |
| TW200942076A (en) * | 2008-01-29 | 2009-10-01 | Koninkl Philips Electronics Nv | Electronic driver circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201114142A (en) | 2011-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102025272B (en) | Discharging circuit | |
| TWI465891B (en) | Power on delay circuit | |
| CN203895095U (en) | Backlight power supply circuit of display screen | |
| CN104113209A (en) | Power module supporting wide voltage inputting | |
| CN102832818A (en) | Constant-voltage power circuit based on single chip processor and constant-voltage power supply device | |
| CN203520222U (en) | LDO (low dropout regulator) | |
| JP2013121203A (en) | Surge voltage protection circuit | |
| CN102025357B (en) | Discharge circuit | |
| CN104037921A (en) | Charging circuit | |
| CN104754800B (en) | A kind of control device of LED modules inrush current | |
| TWI382626B (en) | Discharge circuit | |
| CN206149132U (en) | Switching power supply shutdown rapid discharging circuit based on resistance -capacitance reduction voltage circuit | |
| CN112564471B (en) | Working sequence control circuit in two-stage conversion circuit and method thereof | |
| CN204598412U (en) | A kind of LED drive power soft starting circuit | |
| CN103687137A (en) | Constant-current driving device for LED circuit | |
| CN209012103U (en) | A kind of temperature control automatic speed regulating fan circuit | |
| CN203967732U (en) | A kind of protective circuit of switch power source | |
| CN205680047U (en) | A kind of Intelligent Single-Chip Based reset control circuit | |
| CN204886132U (en) | Prevent voltage pulse circuit | |
| CN107786078A (en) | Discharge circuit | |
| CN220290113U (en) | Current-limiting type linear series voltage stabilizing circuit and voltage stabilizer of battery | |
| CN219041386U (en) | Power-down self-turn-off circuit of servo driver switching power supply | |
| CN104199505B (en) | A kind of Overpower compensating circuit and PFC Overpower compensating circuit structure | |
| TWI458231B (en) | To avoid the sleep mode output below the cut-off voltage of the power output stage circuit | |
| CN210609091U (en) | High-voltage generator based on SPWM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |