CN201928197U - Switching power supply control system - Google Patents
Switching power supply control system Download PDFInfo
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- CN201928197U CN201928197U CN2010206561740U CN201020656174U CN201928197U CN 201928197 U CN201928197 U CN 201928197U CN 2010206561740 U CN2010206561740 U CN 2010206561740U CN 201020656174 U CN201020656174 U CN 201020656174U CN 201928197 U CN201928197 U CN 201928197U
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Abstract
A multi-voltage-class switching power supply control system relates to the electronic technology. The control system comprises a primary stage voltage control module, a secondary voltage control module, a low-voltage control module and a high-voltage control module. The primary voltage control module comprises a feedback loop comprising an exhaustion-type MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) device and an operational amplifier, and the source electrode of the exhaustion-type MOSFET device is the output end of the primary voltage control module; and a level switch circuit is connected in series between the low-voltage control module and the high-voltage control module and further connected with the output ends of both the primary voltage control module and the secondary voltage control module. The control system ensures the accuracy of the system control, provides higher driving voltage, and broadens the choose range of external power devices.
Description
Technical field
The utility model relates to electronic technology, particularly integrated circuit technique.
Background technology
AC/DC Switching Power Supply (SMPS) is widely used, and AC/DC directly carries out the rectifying and wave-filtering adjustment to line voltage, adjusts pipe by switch then and carries out voltage stabilizing, does not need power transformer; The switch operating frequency is at tens kilo hertzs, and filtering capacitor, inductor values are less.Therefore the AC/DC Switching Power Supply have in light weight, characteristics such as volume is little.When line voltage changes, all can obtain stable output voltage in 110V～260V scope.The operating voltage of SMPS control circuit part is low pressure (generally being about 5V), therefore at line voltage (220V) to controlling the processing that needs a step-down between the voltage (5V).At present more processing method is to utilize the resistance step-down, obtains the power-supply system of a univoltage, as shown in Figure 1.Resistance and electric capacity form resistance-capacitance depressurization, and low dropout voltage modulator (LDO) circuit is adjusted to internal control circuit required voltage value to the voltage that resistance and electric capacity obtain, and internal circuit comprises low-pressure control module 5 and high voltage control module 7.By such structure, export a controlling and driving pulse-width modulation (PWM) signal to outside power device.The output voltage that system samples in the load 12 is again adjusted the duty ratio of pwm signal, and then has controlled conducting, the shutoff ratio of external power device, reaches the purpose of control output voltage.This single supply structural circuit is simple, and control precision is higher.But the voltage that drives external power pipe 8,9 also is low-voltage, therefore when selecting the external power pipe, just requires the device that can not select threshold value high.Because low-voltage can not drive fully to the higher power tube of threshold value, in other words, the range of choice that is exactly power device is limited.
The utility model content
Technical problem to be solved in the utility model is that a kind of Switching Power Supply control system with multi-voltage grade of high accuracy and broad accommodation is provided.
The technical scheme that the utility model solve the technical problem employing is, the Switching Power Supply control system of multi-voltage grade, comprise first order voltage regulator module, second level voltage regulator module, low-pressure control module and high voltage control module, described first order voltage regulator module comprises the feedback loop that is made of a depletion type MOS FET device and amplifier, and the source electrode of depletion type MOS FET device is the output of first order voltage regulator module;
Be in series with level shifting circuit between low-pressure control module and high voltage control module, level shifting circuit also is connected with the output of first order voltage regulator module, the output of second level voltage regulator module.
Described second level voltage regulator module comprises the high-gain amplifier and first metal-oxide-semiconductor, the output of second level voltage regulator module is the output of first metal-oxide-semiconductor, the output of first metal-oxide-semiconductor connects the negativity input of high-gain amplifier by first resistance, the output of the control termination high-gain amplifier of first metal-oxide-semiconductor, the negativity input of high-gain amplifier is by second grounding through resistance.
Described level shifting circuit comprises second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor that is series between high voltage input and the ground level, and be series at the 3rd metal-oxide-semiconductor and the 5th metal-oxide-semiconductor between high voltage input and the ground level, the grid of second metal-oxide-semiconductor connects the output of the 3rd metal-oxide-semiconductor, the grid of the 3rd metal-oxide-semiconductor connects the output of second metal-oxide-semiconductor, the output of the control termination inverter of the 4th metal-oxide-semiconductor, the first input end of inverter connects the PWM input of level shifting circuit and the control end of the 5th metal-oxide-semiconductor, the low-voltage input of the second input termination level shifting circuit, the output of the 3rd metal-oxide-semiconductor is the output of level shifting circuit.
The beneficial effects of the utility model are when the utility model guarantees system's control precision, can provide higher driving voltage.Technology of the present utility model has been widened the type selecting scope of external power device.The utility model is very suitable for integrated circuit (IC) chip, has economic chip area, is specially adapted to field of switch power.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 is the schematic diagram of prior art.
Fig. 2 is an electrical block diagram of the present utility model.
Fig. 3 is a second level of the present utility model voltage regulator module circuit diagram.
Fig. 4 is the circuit diagram of level shifting circuit of the present utility model.
Embodiment
Referring to Fig. 2～4.
The utility model comprises first order voltage regulator module 101, second level voltage regulator module 102, low-pressure control module 103 and high voltage control module 104, described first order voltage regulator module 101 comprises depletion type MOS FET device 3, amplifier 13, the feedback loop that the 3rd resistance R 3 and the 4th resistance R 4 constitute, the grid of the output termination depletion type MOS FET device 3 of amplifier 13, the drain electrode of depletion type MOS FET device 3 is the high voltage input, source electrode is the output of first order voltage regulator module 101, connect second level voltage regulator module 102, the source electrode of depletion type MOS FET device 3 also connects the negativity input of amplifier 13 by the 3rd resistance R 3, the negativity input of amplifier 13 is by the 4th resistance R 4 ground connection.The output of first order voltage regulator module 101 also is connected with high voltage control module 104 with level shifting circuit 6.
Be in series with level shifting circuit 6 between low-pressure control module 103 and high voltage control module 104, level shifting circuit 6 also is connected with the output of second level voltage regulator module 102.
Second level voltage regulator module 102 comprises the high-gain amplifier 14 and first metal-oxide-semiconductor 15, the output of second level voltage regulator module 102 is the output of first metal-oxide-semiconductor 15, the output of first metal-oxide-semiconductor 15 connects the negativity input of high-gain amplifier 14 by first resistance R 1, the output of the control termination high-gain amplifier 14 of first metal-oxide-semiconductor 15, the negativity input of high-gain amplifier 14 is by second resistance R, 2 ground connection.
The utility model adopts increases depletion type MOS FET device 3, and inside has formed the control system of a more than electric pressure.In addition, between the different electric pressure control circuits in inside, increase level shifting circuit 6, to guarantee correct circuit function.
Workflow of the present utility model is: outside high voltage at first is input to the first order voltage regulator module 101 that comprises high pressure depletion type MOS FET device 3, the control gate level of depletion type MOS FET device 3 by the 3rd resistance R 3, the 4th resistance R 4 and and the feedback network that constitutes of amplifier 13 produce control voltage.In the switch power supply system initial start stage, the grid and the source potential of depletion type MOS FET device 3 are electronegative potential, and there is conducting channel in depletion type MOS FET device 3, and circuit can conducting.Therefore, depletion type MOS FET device 3 begins to power to system, source potential (also being the internal high pressure power supply) slowly raises, in this voltage uphill process, cut-in voltage to certain setting, internal circuit is started working, and loop begins to adjust automatically this output voltage, finally reaches an accurate magnitude of voltage.Therefore the source electrode at depletion type MOS FET device 3 has formed stable system first electric pressure.With respect to the structure of Fig. 1, this voltage has very high precision, and is subjected to the influence of outside input high pressure very little.After depletion type MOS FET device 3, second level voltage regulator module 102 is used for obtaining second low slightly electric pressure.This low-tension supply offers inner low-pressure control module, obtains high-precision control signal.In order to transmit signal between two electric pressures, level shifting circuit 6 is inserted into between them.Finally, control system provides has high accuracy, the drive signal of high level.
Fig. 3 is the specific implementation of the second level voltage regulator module 102 in the utility model.The reference level REF of the positivity input connecting system of high gain operational amplifier 14, the negativity input inserts the output sampled voltage vfb of sampling resistor network (first resistance R 1, second resistance R 2) feedback.The output of OP provides driving force by follower circuit 15 bufferings, obtains the high-precision power that needs at output out.
The circuit of Fig. 4 is the specific implementation of the level shifting circuit in the utility model.Input pulse-width modulation (PWM) signal 20 and inverter 21 are low-pressure system, and power supply 19 is a low-voltage, and power supply 18 is a high voltage.MOS device 22,23,24,25 is the low-pressure system logic level transition high pressure logic level, by the output of out end.
The power supply of the utility model inside is a double power-supply system.Outputting drive voltage is high voltage (5V～20V).
Specification has proved absolutely principle of the present utility model and necessary technology details, and those of ordinary skill can be implemented the utility model according to specification fully, so repeat no more for the content and the detail parameters of prior art.
Claims (3)
1. the Switching Power Supply control system comprises first order voltage regulator module (101), second level voltage regulator module (102), low-pressure control module (103) and high voltage control module (104), it is characterized in that:
Described first order voltage regulator module (101) comprises the feedback loop that is made of a depletion type MOS FET device (3) and amplifier (13), and the source electrode of depletion type MOS FET device (3) is the output of first order voltage regulator module;
Be in series with level shifting circuit (6) between low-pressure control module (103) and high voltage control module (104), level shifting circuit (6) also is connected with the output of first order voltage regulator module (101), the output of second level voltage regulator module (102).
2. Switching Power Supply control system as claimed in claim 1, it is characterized in that, described second level voltage regulator module (102) comprises high-gain amplifier (14) and first metal-oxide-semiconductor (15), the output of second level voltage regulator module (102) is the output of first metal-oxide-semiconductor (15), the output of first metal-oxide-semiconductor (15) connects the negativity input of high-gain amplifier (14) by first resistance (R1), the output of the control termination high-gain amplifier (14) of first metal-oxide-semiconductor (15), the negativity input of high-gain amplifier (14) is by second resistance (R2) ground connection.
3. Switching Power Supply control system as claimed in claim 1, it is characterized in that, described level shifting circuit (6) comprises second metal-oxide-semiconductor (22) and the 4th metal-oxide-semiconductor (24) that is series between high voltage input and the ground level, and be series at the 3rd metal-oxide-semiconductor (23) and the 5th metal-oxide-semiconductor (25) between high voltage input and the ground level, the grid of second metal-oxide-semiconductor (22) connects the output of the 3rd metal-oxide-semiconductor (23), the grid of the 3rd metal-oxide-semiconductor (23) connects the output of second metal-oxide-semiconductor (22), the output of the control termination inverter (21) of the 4th metal-oxide-semiconductor (24), the first input end of inverter (21) connects the PWM input of level shifting circuit and the control end of the 5th metal-oxide-semiconductor (25), the low-voltage input of the second input termination level shifting circuit, the output of the 3rd metal-oxide-semiconductor (23) is the output of level shifting circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206561740U CN201928197U (en) | 2010-12-13 | 2010-12-13 | Switching power supply control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206561740U CN201928197U (en) | 2010-12-13 | 2010-12-13 | Switching power supply control system |
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|---|---|
| CN201928197U true CN201928197U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206561740U Expired - Fee Related CN201928197U (en) | 2010-12-13 | 2010-12-13 | Switching power supply control system |
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| CN (1) | CN201928197U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035414A (en) * | 2010-12-13 | 2011-04-27 | 成都成电硅海科技股份有限公司 | Switching power supply control system of multiple voltage levels |
| CN107293531A (en) * | 2013-03-07 | 2017-10-24 | 英飞凌科技美国公司 | Electric power Quad Flat No Lead package in single current divider phase inverter |
| US10438876B2 (en) | 2010-12-13 | 2019-10-08 | Infineon Technologies Americas Corp. | Power quad flat no-lead (PQFN) package in a single shunt inverter circuit |
-
2010
- 2010-12-13 CN CN2010206561740U patent/CN201928197U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035414A (en) * | 2010-12-13 | 2011-04-27 | 成都成电硅海科技股份有限公司 | Switching power supply control system of multiple voltage levels |
| CN102035414B (en) * | 2010-12-13 | 2013-03-20 | 成都成电硅海科技股份有限公司 | Switching power supply control system of multiple voltage levels |
| US10438876B2 (en) | 2010-12-13 | 2019-10-08 | Infineon Technologies Americas Corp. | Power quad flat no-lead (PQFN) package in a single shunt inverter circuit |
| CN107293531A (en) * | 2013-03-07 | 2017-10-24 | 英飞凌科技美国公司 | Electric power Quad Flat No Lead package in single current divider phase inverter |
| CN107293531B (en) * | 2013-03-07 | 2021-03-12 | 英飞凌科技美国公司 | Power quad flat no-lead package in single shunt inverter circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20151213 |
|
| EXPY | Termination of patent right or utility model |