CN1172427C - Circuit of switching power supply with secondary power supply and its drive method - Google Patents
Circuit of switching power supply with secondary power supply and its drive method Download PDFInfo
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- CN1172427C CN1172427C CNB021153930A CN02115393A CN1172427C CN 1172427 C CN1172427 C CN 1172427C CN B021153930 A CNB021153930 A CN B021153930A CN 02115393 A CN02115393 A CN 02115393A CN 1172427 C CN1172427 C CN 1172427C
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Abstract
The present invention discloses a circuit of switching a power supply with a secondary power supply, which comprises a secondary voltage boosting circuit, a main power circuit, a drive circuit and a pulse width modulation controller. After input voltage is boosted by the secondary voltage boosting circuit, secondary voltage is obtained. A secondary power supply provides the voltage for the drive circuit. After pulse width modulation signals outputted by the pulse width modulation controller are transformed by the drive circuit, the pulse width modulation signals drive the main power circuit. The present invention is characterized in that the pulse width modulation signals outputted by the pulse width modulation controller as drive pulses of the secondary voltage boosting circuit also drive the secondary voltage boosting circuit. The present invention sufficiently uses the advantage that a low voltage pulse width modulation controller can work under low voltage. The special low voltage pulse width modulation controller of the secondary power supply is cancelled. One pulse width modulation simultaneously provides the drive pulse of the secondary power supply and the drive pulse of the main power circuit. In this way, the circuit of switching a power supply with a secondary power supply saves one pulse width modulation controller of the secondary power supply, simplifies the circuit and reduces cost. The circuit of switching a power supply with a secondary power supply is especially suitable for a voltage boosting circuit or a voltage reducing circuit with low voltage input.
Description
Technical field:
The present invention relates to a kind of switching power circuit of the switching power circuit that contains accessory power supply, particularly low input.
Background technology:
In the Switching Power Supply of low pressure input, in order to drive floating ground synchronous rectifier, must design auxiliary power circuit (generally using the BOOST booster circuit) the boost voltage VCC higher than input voltage vin is provided,, guarantee the circuit operate as normal to guarantee to have sufficiently high driving voltage.
At present industry a kind of auxiliary power circuit commonly used as shown in Figure 1, its independently auxiliary power circuit constitute by PDM keyer PWM1 and BOOST circuit, finish boosting from VIN to VCC.This VCC is the PDM keyer PWM2 and the drive circuit DRIVE power supply of main power circuit, finishes the control to main power circuit BUCK/BOOST.This circuit has adopted two independently PWM controllers.
At present industry another kind of auxiliary power circuit commonly used as shown in Figure 2, its independently the VCC booster circuit constitute by PDM keyer PWM1 and BOOST circuit, finish boosting from VIN to VCC.This VCC is the drive circuit DRIVE power supply of main power circuit, finishes the control to main power circuit BUCK/BOOST.This circuit has adopted two independently PWM controllers.With the difference of Fig. 1 be: the master pulse width modulation controller PWM2 of this circuit can be by the power supply of input power supply.
Above-mentioned existing auxiliary power circuit need be used special-purpose PDM keyer (PWM IC), and device is many, cost height, circuit complexity.
Summary of the invention:
Purpose of the present invention is exactly to provide a kind of switching power circuit that contains accessory power supply in order to overcome the above problems, and makes that it is simple in structure, efficient is high, cost is low.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of switching power circuit that contains accessory power supply, comprise auxiliary boost circuit, main power circuit, drive circuit, PDM keyer, input voltage obtains boost voltage after the auxiliary boost circuit raises, boost voltage provides voltage for drive circuit; The pulse-width signal of PDM keyer output is characterized in that by drive circuit conversion rear drive master power circuit: the pulse-width signal of PDM keyer output also drives the auxiliary boost circuit, as the driving pulse of auxiliary boost circuit; Described auxiliary boost circuit comprises the 6th triode, inductance and rectifier diode, input voltage connects rectifier diode anode and the 6th transistor collector through inductance, the grounded emitter of the 6th triode, base stage connects the pulse-width signal of PDM keyer output, rectifier diode minus earth; Described drive circuit comprises the 3rd triode, the 4th triode and the 5th power tube, the pulse-width signal of PDM keyer output just is connected on the grid of the 5th power tube, the source ground of the 5th power tube, drain electrode connects the common base stage of described the 3rd triode and the 4th triode, the output of the common emitter of described the 3rd triode and the 4th triode be exactly pulse-width signal through amplification, this signal is received the grid of second synchronous rectifier in the main power circuit, the grounded collector of the 4th triode, the collector electrode of the 3rd triode connects boost voltage.
Adopt the beneficial effect of above scheme: the present invention has made full use of the advantage that the low pressure PDM keyer can be worked under low voltage, the special-purpose low pressure PDM keyer of cancellation accessory power supply, the driving pulse of accessory power supply driving pulse and main power circuit is provided simultaneously by a PDM keyer, so just, saved an accessory power supply PDM keyer, simplify circuit, reduced cost.
Description of drawings:
Fig. 1 is a kind of auxiliary power circuit schematic diagram of using always.
Fig. 2 is the another kind of auxiliary power circuit schematic diagram of using always.
Fig. 3 is a kind of auxiliary power circuit block diagram of the present invention.
Fig. 4 is that a kind of auxiliary power circuit of the present invention is used schematic diagram.
Embodiment:
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
See Fig. 3, this switching power circuit comprises auxiliary boost circuit 1 (representing with BOOST among the figure), main power circuit 2 (representing with BOOST/BUCK among the figure), drive circuit 3 (representing with DRIVE among the figure), PDM keyer 4 (representing with PWM among the figure), input voltage vin obtains boost voltage after auxiliary boost circuit 1 raises, boost voltage is connected to drive circuit; The pulse-width signal of PDM keyer 4 outputs is received main power circuit 2 through drive circuit 3, it is characterized in that: the pulse-width signal of PDM keyer 4 outputs also has one the tunnel to receive auxiliary boost circuit 1 at least, as the driving pulse of auxiliary boost circuit 1.
See Fig. 4, described auxiliary boost circuit 1 comprises switching device (being triode among the figure) Q6, inductance L 3 and rectifier diode D2, input voltage vin connects rectifier diode D2 anode and switching device Q6 collector electrode through inductance L 3, the grounded emitter of switching device Q6, base stage connects the pulse-width signal of PDM keyer 4 outputs, rectifier diode D2 minus earth.
Described main power circuit 2 to be the BOOST circuit, also can be the BUCK circuit also.Main power circuit 2 shown in Fig. 4 is a kind of BOOST circuit, include at least two synchronous rectifier Q1, Q2 in the described main power circuit 2 (for ease of drawing, Q1 is not drawn in the square frame among Fig. 4), their drain electrode connects input voltage vin, the source ground of the first synchronous rectifier Q1 wherein, the source electrode of the second synchronous rectifier Q2 is the output of main power circuit 2; The pulse-width signal that the pulse-width signal of described PDM keyer 4 outputs is directly delivered to auxiliary boost circuit 1 is also received the grid of the first synchronous rectifier Q1 simultaneously, just receives the grid of the second synchronous rectifier Q2 through the pulse-width signal of drive circuit 3.As seen, wherein Q2 is a floating ground synchronous rectifier, and its driving needs sufficiently high driving voltage, and drive circuit 3 is exactly in order to realize this function.And the output signal of PDM keyer 4 can be directly adopted in the driving of Q1.
Described PDM keyer 4 can be formed with ready-made PWM chip, for example: MIC2185 chip etc.
See Fig. 4, drive circuit 3 comprises triode Q3, Q4 and power tube Q5, the pulse-width signal of PDM keyer 4 outputs just is connected on the grid of power tube Q5, the source ground of power tube Q5, drain electrode connects the common base stage of triode Q3 and Q4, the common emitter output of Q3 and Q4 be exactly pulse-width signal through amplification, this signal is received the grid of the second synchronous rectifier Q2 in the main power circuit, the grounded collector of triode Q4, the collector electrode of Q3 meets boost voltage VCC.
As seen from the above description, the present invention be both driven main circuit with same PWM chip synchronous rectifier Q1, Q2 (certainly, wherein also must through and amplification) the drive signal of Q2, drive the triode Q3 in the auxiliary boost circuit 1 again, accessory power supply just need not special-purpose low pressure PDM keyer like this, has simplified circuit.
Above-mentioned auxiliary power circuit proposed by the invention is confirmed by experiment that described circuit is used in the input of 3.3V direct current, and in the DC/DC power supply of 5V/8A direct current output (main power circuit adopts the BOOST circuit), power stage efficient reaches more than 93%.
Claims (2)
1. switching power circuit that contains accessory power supply, comprise auxiliary boost circuit (1), main power circuit (2), drive circuit (3), PDM keyer (4), input voltage (Vin) obtains boost voltage (Vcc) after auxiliary boost circuit (1) raises, boost voltage (Vcc) provide voltage for drive circuit (3); The pulse-width signal of PDM keyer (4) output is by drive circuit (3) conversion rear drive master's power circuit (2), it is characterized in that: the pulse-width signal of PDM keyer (4) output also drives auxiliary boost circuit (1), as the driving pulse of auxiliary boost circuit (1);
Described auxiliary boost circuit (1) comprises the 6th triode (Q6), inductance (L3) and rectifier diode (D2), input voltage (Vin) connects rectifier diode (D2) anode and the 6th triode (Q6) collector electrode through inductance (L3), the grounded emitter of the 6th triode (Q6), base stage connects the pulse-width signal of PDM keyer (4) output, rectifier diode (D2) minus earth;
Described drive circuit (3) comprises the 3rd triode (Q3), the 4th triode (Q4) and the 5th power tube (Q5), the pulse-width signal of PDM keyer (4) output just is connected on the grid of the 5th power tube (Q5), the source ground of the 5th power tube (Q5), drain electrode connects the common base stage of described the 3rd triode (Q3) and the 4th triode (Q4), the output of the common emitter of described the 3rd triode (Q3) and the 4th triode (Q4) be exactly pulse-width signal through amplification, this signal is received the grid of second synchronous rectifier (Q2) in the main power circuit, the grounded collector of the 4th triode (Q4), the collector electrode of the 3rd triode (Q3) connects boost voltage (VCC).
2. the switching power circuit that contains accessory power supply as claimed in claim 1, it is characterized in that: comprise first synchronous rectifier (Q1) and second synchronous rectifier (Q2) in the described main power circuit (2), the drain electrode of described first synchronous rectifier (Q1) and second synchronous rectifier (Q2) connects input voltage (Vin), the source ground of first synchronous rectifier (Q1) wherein, the source electrode of second synchronous rectifier (Q2) connects the output of main power circuit (2); The pulse-width signal of PDM keyer (4) output, deliver to the grid of second synchronous rectifier (Q2) through drive circuit (3), the pulse-width signal of PDM keyer (4) output is simultaneously also delivered to the grid and the auxiliary boost circuit (1) of first synchronous rectifier (Q1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021153930A CN1172427C (en) | 2002-06-15 | 2002-06-15 | Circuit of switching power supply with secondary power supply and its drive method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021153930A CN1172427C (en) | 2002-06-15 | 2002-06-15 | Circuit of switching power supply with secondary power supply and its drive method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1387305A CN1387305A (en) | 2002-12-25 |
| CN1172427C true CN1172427C (en) | 2004-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021153930A Expired - Fee Related CN1172427C (en) | 2002-06-15 | 2002-06-15 | Circuit of switching power supply with secondary power supply and its drive method |
Country Status (1)
| Country | Link |
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| CN (1) | CN1172427C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352153C (en) * | 2003-04-25 | 2007-11-28 | 中兴通讯股份有限公司 | Switch transformation installation wth input in low voltage |
| CN101057386B (en) * | 2004-11-12 | 2011-02-02 | Nxp股份有限公司 | A power converter |
| CN100536302C (en) * | 2006-12-27 | 2009-09-02 | 艾默生网络能源有限公司 | BUCK driving circuit |
| US8008898B2 (en) * | 2008-01-30 | 2011-08-30 | Cirrus Logic, Inc. | Switching regulator with boosted auxiliary winding supply |
| CN109039028B (en) * | 2018-07-09 | 2020-06-16 | 华为技术有限公司 | Control circuit applied to power adapter and power adapter |
| CN114994395B (en) * | 2022-08-05 | 2022-12-06 | 成都国佳电气工程有限公司 | Passive railway high-voltage cable related current detection device |
-
2002
- 2002-06-15 CN CNB021153930A patent/CN1172427C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1387305A (en) | 2002-12-25 |
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Owner name: YADA POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20140909 |
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Free format text: CORRECT: ADDRESS; FROM: 518057 SHENZHEN, GUANGDONG PROVINCE TO: 518101 SHENZHEN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20140909 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Astec power supply (Shenzhen) Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041020 Termination date: 20210615 |