CN204559392U - The booster driving circuit of comprehensive wiring system current feedback - Google Patents
The booster driving circuit of comprehensive wiring system current feedback Download PDFInfo
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- CN204559392U CN204559392U CN201520178394.XU CN201520178394U CN204559392U CN 204559392 U CN204559392 U CN 204559392U CN 201520178394 U CN201520178394 U CN 201520178394U CN 204559392 U CN204559392 U CN 204559392U
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Abstract
The booster driving circuit of comprehensive wiring system current feedback, comprises the input, inductance, the power tube that connect successively; Be connected with load between described power NMOS tube and ground, the common port of described load and power tube, as feedback voltage sampling end, is connected with feedback control loop between described feedback voltage sampling end and the control end of power tube; Described feedback control loop route sample circuit, error amplifier, PWM comparator, current comparator, logic drive circuit, reference voltage and level displacement circuit form; Described level displacement circuit is high level shift circuit, and the positive power source terminal of output signal is connected with the common port of inductance and power tube; Also comprise the storage capacitor be connected between feedback voltage sampling end and ground.Adopt the booster driving circuit of comprehensive wiring system current feedback described in the utility model, load is directly added in power tube source class, and achieve detection and the FEEDBACK CONTROL of load voltage, can high-voltage load be driven, adopt Current Feedback Control to further increase loop response speed.
Description
Technical field
The utility model belongs to integrated circuit (IC) design field, relates to Switching Power Supply, particularly a kind of booster driving circuit of comprehensive wiring system current feedback.
Background technology
Along with the high speed development of power electronic technology, the work of power electronic equipment and people, the relation of life are day by day close, and electronic equipment all be unable to do without reliable power supply, enter computer power supply round Realization eighties Switching Power Supply, taken the lead in computer power supply regenerate, enter nineties Switching Power Supply and in succession enter various electronics, electric equipment field, stored-program control exchange, communication, electron detection device power supply, control appliance power supply etc. employ Switching Power Supply all widely, more facilitate developing rapidly of switch power technology.
Switching Power Supply is compared with linear power supply, and the cost of the two all increases along with the increase of power output, but the two rate of rise is different.Linear power supply cost on a certain power output point, on the contrary higher than Switching Power Supply.Along with development and the innovation of power electronic technology, switch power technology is constantly being innovated, this cost rollback point moves to low output power end day by day, and this provides development space widely for Switching Power Supply.
Traditional various switch power supply topological structures comprise at least inductance, power tube and rectifier diode, produce different output voltages along with the difference of this three's annexation, the FEEDBACK CONTROL of Switching Power Supply realizes the form of expression of all existing various maturation from theory to reality.
Along with the trend of the integrated portability of electronic equipment, more and more stricter requirement is proposed to the bulk of various electronic device, require the least possible number of devices or device size little as far as possible, realize the miniaturization of equipment.
Utility model content
For reducing number of devices, saving electronic equipment internal space, the utility model discloses a kind of booster driving circuit of comprehensive wiring system current feedback.
The booster driving circuit of comprehensive wiring system current feedback described in the utility model, is characterized in that, comprises the input, inductance, the power tube pair that connect successively; Described power tube to and ground between be connected with load and the current sense resistor of series connection, the common port of described load and power tube, as feedback voltage sampling end, is connected with feedback control loop between described feedback voltage sampling end and the control end of power tube; Described power tube forms by the power tube PMOS of parallel connection and power NMOS tube;
Described feedback control loop route sample circuit, error amplifier, PWM comparator, triangular-wave generator, logic drive circuit, reference voltage and level displacement circuit form;
Described sample circuit input connects feedback voltage sampling end, two inputs of described error amplifier connect reference voltage and sample circuit output respectively, two inputs of PWM comparator connect the output of triangular-wave generator and error amplifier respectively, the output of PWM comparator connects logic drive circuit, logic drive circuit output connects level displacement circuit, and level displacement circuit output connects power tube control end;
Described level displacement circuit is high level shift circuit, and the positive power source terminal of output signal is connected with the common port of inductance and power tube;
Also comprise the storage capacitor be connected between feedback voltage sampling end and ground.
Concrete, described reference voltage is bandgap voltage reference.
Concrete, described sample circuit is the divider resistance string be connected between feedback voltage sampling end and ground, and sample circuit output is divider node.
Concrete, be also connected with building-out capacitor between described error amplifier and ground.
Adopt the booster driving circuit of comprehensive wiring system current feedback described in the utility model, by cancelling the rectifier diode in traditional B OOST framework, load is directly added in power tube source class, and achieve detection and the FEEDBACK CONTROL of load voltage, can high-voltage load be driven, adopt Current Feedback Control to further increase loop response speed.
Accompanying drawing explanation
Fig. 1 illustrates a kind of embodiment structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The booster driving circuit of comprehensive wiring system current feedback described in the utility model, comprises the input, inductance, the power tube pair that connect successively; Described power tube to and ground between be connected with load and the current sense resistor of series connection, the common port of described load and power tube, as feedback voltage sampling end, is connected with feedback control loop between described feedback voltage sampling end and the control end of power tube; Described power tube forms by the power tube PMOS of parallel connection and power NMOS tube;
Described feedback control loop route sample circuit, error amplifier, PWM comparator, triangular-wave generator, logic drive circuit, reference voltage and level displacement circuit form;
Described sample circuit input connects feedback voltage sampling end, two inputs of described error amplifier connect reference voltage and sample circuit output respectively, two inputs of PWM comparator connect the output of triangular-wave generator and error amplifier respectively, the output of PWM comparator connects logic drive circuit, logic drive circuit output connects level displacement circuit, and level displacement circuit output connects power tube control end;
Described level displacement circuit is high level shift circuit, and the positive power source terminal of output signal is connected with the common port of inductance and power tube;
Also comprise the storage capacitor be connected between feedback voltage sampling end and ground.
The feedback voltage sampling end of feedback control loop is arranged on power tube source class by the utility model, when the sampled value of this point voltage peak value is greater than the reference voltage value VREF of error amplifier connection, the square-wave signal duty ratio that output voltage error amplifier control PWM comparator exports reduces, thus power tube opening time is reduced, reduce power tube drain electrode crest voltage.When the sampled value of this point voltage peak value is less than the reference voltage value of error amplifier connection, then the square-wave signal duty ratio that output voltage error amplifier control PWM comparator exports increases, and improves power tube drain electrode crest voltage.
The utility model introduces current controlled circuit further, current sense resistor RCS and load in series, two inputs of current comparator detect the pressure drop at current sense resistor two ends, when a current flows through, produce pressure drop, electric current is larger, voltage drop value is larger, due to the periodic switch of power tube, what current comparator exported is periodically be similar to triangular wave waveform, electric current is larger, peak value and the rate of rise of triangular wave are larger, the duty ratio of PWM comparator output signal is less, thus regulating power pipe ON time reduces, current value reduces, realize Current Feedback Control, improve the response speed of control loop.
Owing to load being directly connected on power tube source class in the utility model, power tube source voltage is higher, therefore the voltage driven higher than source class must be used at grid, optimum voltage is the drain voltage of power tube, the i.e. common port SW of inductance and power tube, the effect of level displacement circuit is that positive voltage lower for input signal is promoted to power tube drain voltage, such as an exemplary embodiment, control loop uses 5V voltage, but drain at power tube, 25V voltage may be obtained, the logical signal high level voltage that logic drive circuit exports by level displacement circuit is converted into 25V voltage from 5V.Level displacement circuit is ripe prior art, adopts paired CMOS tube to realize, and generally includes 2 P pipes and 2 N pipes.
Storage capacitor COUT role carries out integration energy storage to output, makes output VOUT can obtain a comparatively galvanic current pressure value, for driving DC load, and such as light-emitting diode etc.
Inductor in the effect of inductance L and traditional switch power supply seemingly, plays energy storage effect, when power tube firing current increases, is that magnetic field energy stores by galvanic energy conversion, the release generation high pressure when power tube is closed.Specific works process is: when power NMOS tube MN1 opens, and power tube PMOS MP1 closes, inductive energy storage, and when power NMOS tube is closed, power tube PMOS is opened, and inductance discharges to storage capacitor, provides the high pressure required for storage capacitor COUT.
Described sample circuit can for being connected to the divider resistance string between feedback voltage sampling end and ground, and be such as made up of R1 and R2 two divider resistances, sample circuit output is divider node.Sampling end voltage in proportion can be reduced to error amplifier by which can in detection range.
Owing to eliminating the diode in original Switching Power Supply topology in the utility model, adopt power tube to replacement, power tube to and control loop be all integrated in chip internal, decrease peripheral cell, and can boost function be realized.
Concrete, described reference voltage is bandgap voltage reference.Described power tube can be metal-oxide-semiconductor or triode.
Preferably, between the output of described error amplifier and ground, be connected with building-out capacitor C2, a dominant pole can be provided for control loop, the stability that reinforcing feedback controls.
Previously described is each preferred embodiment of the present utility model, preferred implementation in each preferred embodiment is if not obviously contradictory or premised on a certain preferred implementation, each preferred implementation can stack combinations use arbitrarily, design parameter in described embodiment and embodiment is only the utility model proof procedure in order to clear statement utility model people, and be not used to limit scope of patent protection of the present utility model, scope of patent protection of the present utility model is still as the criterion with its claims, the equivalent structure change that every utilization specification of the present utility model and accompanying drawing content are done, in like manner all should be included in protection range of the present utility model.
Claims (4)
1. the booster driving circuit of comprehensive wiring system current feedback, is characterized in that, comprises the input, inductance, the power tube pair that connect successively; Described power tube to and ground between be connected with load and the current sense resistor of series connection, the common port of described load and power tube, as feedback voltage sampling end, is connected with feedback control loop between described feedback voltage sampling end and the control end of power tube; Described power tube forms by the power tube PMOS of parallel connection and power NMOS tube;
Described feedback control loop route sample circuit, error amplifier, PWM comparator, triangular-wave generator, logic drive circuit, reference voltage and level displacement circuit form;
Described sample circuit input connects feedback voltage sampling end, two inputs of described error amplifier connect reference voltage and sample circuit output respectively, two inputs of PWM comparator connect the output of triangular-wave generator and error amplifier respectively, the output of PWM comparator connects logic drive circuit, logic drive circuit output connects level displacement circuit, and level displacement circuit output connects power tube control end;
Described level displacement circuit is high level shift circuit, and the positive power source terminal of output signal is connected with the common port of inductance and power tube;
Also comprise the storage capacitor be connected between feedback voltage sampling end and ground.
2. the booster driving circuit of comprehensive wiring system current feedback as claimed in claim 1, it is characterized in that, described reference voltage is bandgap voltage reference.
3. the booster driving circuit of comprehensive wiring system current feedback as claimed in claim 1, it is characterized in that, described sample circuit is the divider resistance string be connected between feedback voltage sampling end and ground, and sample circuit output is divider node.
4. the booster driving circuit of comprehensive wiring system current feedback as claimed in claim 1, is characterized in that, be also connected with building-out capacitor between described error amplifier and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520178394.XU CN204559392U (en) | 2015-03-27 | 2015-03-27 | The booster driving circuit of comprehensive wiring system current feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520178394.XU CN204559392U (en) | 2015-03-27 | 2015-03-27 | The booster driving circuit of comprehensive wiring system current feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204559392U true CN204559392U (en) | 2015-08-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520178394.XU Expired - Fee Related CN204559392U (en) | 2015-03-27 | 2015-03-27 | The booster driving circuit of comprehensive wiring system current feedback |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204559392U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779791A (en) * | 2015-03-27 | 2015-07-15 | 绵阳豪迈电子科技有限公司 | Boosting driving circuit for comprehensive wiring system |
| CN107656124A (en) * | 2017-04-24 | 2018-02-02 | 深圳市华芯邦科技有限公司 | Boost load current detection circuits and method without external sampling resistance |
-
2015
- 2015-03-27 CN CN201520178394.XU patent/CN204559392U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779791A (en) * | 2015-03-27 | 2015-07-15 | 绵阳豪迈电子科技有限公司 | Boosting driving circuit for comprehensive wiring system |
| CN107656124A (en) * | 2017-04-24 | 2018-02-02 | 深圳市华芯邦科技有限公司 | Boost load current detection circuits and method without external sampling resistance |
| CN107656124B (en) * | 2017-04-24 | 2023-06-09 | 深圳市华芯邦科技有限公司 | Boost load current detection circuit and method without external sampling resistor |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20170327 |