CN104917379A - MOS bootstrap driving circuit of solar controller of common-source structure - Google Patents
MOS bootstrap driving circuit of solar controller of common-source structure Download PDFInfo
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- CN104917379A CN104917379A CN201510222149.9A CN201510222149A CN104917379A CN 104917379 A CN104917379 A CN 104917379A CN 201510222149 A CN201510222149 A CN 201510222149A CN 104917379 A CN104917379 A CN 104917379A
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Abstract
The invention relates to an MOS bootstrap driving circuit of a solar controller of a common-source structure. The MOS bootstrap driving circuit is characterized in that the MOS bootstrap driving circuit is composed of a main charging loop (1) and a bootstrap driving loop (2); the main charging loop (1) is composed of MOSFET tubes Q1-Q2, a resistor R1, a diode D1, an inductor L1, and electrolytic capacitors EC1-EC2, all of which are connected; the bootstrap driving loop (2) is composed of a driving chip IC1, resistors R2-R5, a diode D2, a capacitor C1, and an electrolytic capacitor EC2, all of which are connected; a voltage output end Vb of the driving chip IC1 is connected to the short-circuiting joint of the gate of the MOSFET tube Q1 and the gate of the MOSFET tube Q2 through the capacitor C1 and the resistor R5 to form an MOS bootstrap driving loop; and an end Vs of the driving chip IC1 is connected to the short-circuiting joint of the gate of the MOSFET tube Q1 and the gate of the MOSFET tube Q2 through the resistor R5, and the resistor R4 is connected across the gate and the source of the MOSFET tube Q1, so as to form a battery reverse charge prevention structure. The problem that an existing high-end driving mode is limited by the working frequency of an optical coupler, has a narrow scope of application and is complex in driving process and poor in reliability is solved.
Description
Technical field:
The present invention relates to a kind of MOS Bootstrapping drive circuit of controller for solar of common source configuration.Belong to solar charger control technology field.
Background technology:
At present, in order to solve the problem that conventional energy resource is petered out and environmental pollution is day by day serious, the development & application of new forms of energy more and more comes into one's own.Wherein new forms of energy contain solar energy, wind energy, tidal energy etc., and solar energy with its clean environment firendly, the advantage such as wide, the safe and convenient of the scope of application can obtain development & application gradually, therefore photovoltaic power generation technology is rapidly developed in worldwide, solar charging controller, as the important component part of in photovoltaic generating system, also obtains very large development.Solar charging controller is used for the whole process charging control of solar cell to charge in batteries.
In prior art, controller for solar generally takes step-down charging modes, and the type of drive that the MOSFET pipe in charging circuit adopts mainly contains two kinds:
One is low side type of drive, as shown in Figure 1, MOSFET pipe source ground or floating ground, although drive simple, but there is following defect: (1) is unfavorable for that detecting photovoltaic cell voltage judges whether to meet charging, easily cause erroneous judgement, (2) not easily carry out light-operated to load.Therefore, low side type of drive is not as the selection of solar charging electric control.
Another kind is high-side driver mode, as shown in Figure 2, MOSFET pipe source electrode is positioned on storage battery output voltage, although photovoltaic voltage can be detected more accurately carry out charging control, to the light-operated control of load etc., but the end type of drive of prior art takes insulating power supply optocoupler to drive, there is following defect: (1) is subject to the restriction of optocoupler operating frequency, generally can reach 30K just very high, the scope of application is narrower.(2) need to relate to insulating power supply part, drive more complicated, the poor reliability of process.(3) cannot accomplish to select drive circuit according to the demand of controller, there is the problem of narrow application range.
Therefore, need to provide a kind of power circuit simple, drive high-end drive circuit easily to solve above problem.
Summary of the invention:
Object of the present invention, be for solve existing high-side driver mode exist be subject to optocoupler operating frequency restriction, the scope of application is narrower and driving process is more complicated, the problem of poor reliability, provides a kind of MOS Bootstrapping drive circuit of controller for solar of common source configuration.
Object of the present invention can reach by the following technical programs:
A kind of MOS Bootstrapping drive circuit of controller for solar of common source configuration, its design feature is: be made up of main charge circuit (1) and bootstrapping drive circuit (2), main charge circuit (1) is formed by connecting by MOSFET pipe Q1-Q2, resistance R1, diode D1, inductance L 1 and electrochemical capacitor EC1-EC2, and bootstrapping drive circuit (2) is formed by connecting by driving chip IC1, resistance R2-R5, diode D2, electric capacity C1 and electrochemical capacitor EC2; The drain electrode of MOSFET pipe Q2 by inductance L 1 connect storage battery charging input end and by electrochemical capacitor EC2 ground connection, the drain electrode of MOSFET pipe Q1 connects the voltage output end of solar cell and passes through electrochemical capacitor EC1 ground connection, and diode D1 plus earth, negative electrode meet MOSFET pipe Q2 and drain; Pass through resistance R1 ground connection, the source electrode of MOSFET pipe Q1 and the source shorted of MOSFET pipe Q2 after the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2, form common source connect in series structure; Driving chip IC1 has drive control signal input WPM, the power input VDD external power supply VCC of driving chip IC1 and by electric capacity EC3 ground connection, external power supply VCC connects the voltage output end Vb of driving chip IC1 by resistance R, diode D2, the voltage output end Vb of described dynamic chip IC 1 connects the grid of MOSFET pipe Q1 and the grid short circuit place of MOSFET pipe Q2 by electric capacity C1, resistance R5, forms MOS bootstrapping drive circuit; The HO end of driving chip IC1 connects the source electrode of MOSFET pipe Q1 and the source shorted place of MOSFET pipe Q2 by resistance R3, the Vs end of driving chip IC1 connects the grid of MOSFET pipe Q1 and the grid short circuit place of MOSFET pipe Q2 by resistance R5, between the grid of resistance R4 cross-over connection MOSFET pipe Q1 and source electrode, form electricity storage preventing pond reverse charge structure.
Object of the present invention can also reach by the following technical programs:
Further, the drive control signal input WPM of driving chip IC1 inputs the PWM ripple signal of single-chip microcomputer generation, is controlled by this PWM ripple signal.
Further, electric capacity C1 forms bootstrap capacitor, resistance R2 forms charging resistor, pole pipe D2 forms fast recovery diode, fast quick-recovery formula charge circuit is formed by being connected driving chip IC1 voltage output end Vb after resistance 2 and pipe D2 connect, pass through electric capacity C1, resistance R5 by driving chip IC1 voltage output end Vb connect the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2 and pass through resistance R1 ground connection, form bootstrap charge circuit loop.
Further, electrochemical capacitor EC1-EC3 is filter capacitor.
Further, described MOSFET pipe Q1-Q2 is N-type MOSFET pipe, and Q1 drain electrode is connected with solar panels+(PV+), and Q2 drain electrode is connected with storage battery by inductance.
Further, the model of described driving chip IC1 is FAN7371.
The present invention has following outstanding beneficial effect:
1, the present invention is owing to arranging main charge circuit and bootstrapping drive circuit, connect the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2 by the voltage output end Vb of the dynamic chip IC 1 of described bootstrapping drive circuit by electric capacity C1, resistance R5, form MOS bootstrapping drive circuit; Held by the Vs of this driving chip IC1 and connect the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2 by resistance R5, between the grid of resistance R4 cross-over connection MOSFET pipe Q1 and source electrode, form electricity storage preventing pond reverse charge structure; Therefore, solve existing high-side driver mode exist be subject to optocoupler operating frequency restriction, the scope of application is narrower and driving process is more complicated, the problem of poor reliability, have when effective object is battery, do not need the initial charge for bootstrap capacitor to provide a higher voltage, rely on bootstrap capacitor negative bias point can complete the beneficial effect that bootstrap capacitor initialization starts charging with initially drawing.
2, the present invention can electricity storage preventing pond reverse charge, turns off thoroughly, has that drive circuit is simple, an applied range and safe and reliable and higher operating frequency can be allowed to drive be easy to the beneficial effects such as realization.
Accompanying drawing illustrates:
Fig. 1 and Fig. 2 is the circuit theory diagrams of the solar charging controller of prior art.
Fig. 3 is the circuit theory diagrams of the present invention's specific embodiment.
Embodiment
Specific embodiment 1:
Fig. 3 forms specific embodiments of the invention 1.
With reference to Fig. 3, the present embodiment is made up of main charge circuit 1 and bootstrapping drive circuit 2, main charge circuit 1 is formed by connecting by MOSFET pipe Q1-Q2, resistance R1, diode D1, inductance L 1 and electrochemical capacitor EC1-EC2, and bootstrapping drive circuit (2) is formed by connecting by driving chip IC1, resistance R2-R5, diode D2, electric capacity C1 and electrochemical capacitor EC2; The drain electrode of MOSFET pipe Q2 by inductance L 1 connect storage battery charging input end and by electrochemical capacitor EC2 ground connection, the drain electrode of MOSFET pipe Q1 connects the voltage output end of solar cell and passes through electrochemical capacitor EC1 ground connection, and diode D1 plus earth, negative electrode meet MOSFET pipe Q2 and drain; Pass through resistance R1 ground connection, the source electrode of MOSFET pipe Q1 and the source shorted of MOSFET pipe Q2 after the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2, form common source connect in series structure; Driving chip IC1 has drive control signal input WPM, the power input VDD external power supply VCC of driving chip IC1 and by electric capacity EC3 ground connection, external power supply VCC connects the voltage output end Vb of driving chip IC1 by resistance R, diode D2, the voltage output end Vb of described dynamic chip IC 1 connects the grid of MOSFET pipe Q1 and the grid short circuit place of MOSFET pipe Q2 by electric capacity C1, resistance R5, forms MOS bootstrapping drive circuit; The HO end of driving chip IC1 connects the source electrode of MOSFET pipe Q1 and the source shorted place of MOSFET pipe Q2 by resistance R3, the Vs end of driving chip IC1 connects the grid of MOSFET pipe Q1 and the grid short circuit place of MOSFET pipe Q2 by resistance R5, between the grid of resistance R4 cross-over connection MOSFET pipe Q1 and source electrode, form electricity storage preventing pond reverse charge structure.
In the present embodiment:
The drive control signal input WPM of driving chip IC1 inputs the PWM ripple signal of single-chip microcomputer generation, is controlled by this PWM ripple signal.
Electric capacity C1 forms bootstrap capacitor, resistance R2 forms charging resistor, pole pipe D2 forms fast recovery diode, fast quick-recovery formula charge circuit is formed by being connected driving chip IC1 voltage output end Vb after resistance 2 and pipe D2 connect, pass through electric capacity C1, resistance R5 by driving chip IC1 voltage output end Vb connect the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2 and pass through resistance R1 ground connection, form bootstrap charge circuit loop.
Electrochemical capacitor EC1-EC3 is filter capacitor.Described MOSFET pipe Q1-Q2 is N-type MOSFET pipe, and Q1 drain electrode is connected with solar panels+(PV+), and Q2 drain electrode is connected with storage battery by inductance.
The model of described driving chip IC1 is FAN7371.1st pin of this driving chip IC1 connects power supply, the 4th pin that electric capacity EC3 positive pole connects the 1st pin of IC1, negative pole meets IC1; Power supply VCC is by connecing the 8th pin of IC1 after charging resistor R2 forward series connection Ultrafast recovery diode D2; 8th pin of the one termination IC1 of bootstrap capacitor C1, the 6th pin of another termination IC1; 6th pin of IC1 receives the source electrode of MOSFET pipe Q1-Q2 by a current-limiting resistance R5; The grid of 7th pin by driving resistance R3 to connect MOSFET pipe Q1 and Q2 of IC1; The PWM ripple that driving chip IC1 is produced by single-chip microcomputer connects the 2nd pin and controls.
EC3 forms filter capacitor, and R2 forms charging resistor, and D2 forms anti-reverse charging diode, and C1 forms bootstrap capacitor, and R3 forms driving resistance, and R4 forms pull down resistor, and R5 forms current-limiting resistance; EC1 forms filter capacitor, and D1 forms fly-wheel diode, and L1 is inductance, and EC2 forms filter capacitor, and R1 forms boot loader resistance.
1st pin of described driving chip IC1 can connect 18V power supply.Described anti-reverse charging diode D1 is Ultrafast recovery diode.Described bootstrap capacitor C1 selects polarity free capacitor.Described series connection MOSFET pipe is N-type MOSFET pipe.Described boot loader resistance needs to choose the oxide-film resistance of power at least 2W.
The operation principle of the present embodiment:
With reference to Fig. 3, the present invention by the common source configuration of MOSFET pipe and the initial source electrode of charge initiation resistance drop-down act on, can be the situation of storage battery at charging object, initialization startup be carried out to bootstrap capacitor, completes the startup of Bootstrap drive circuit.
When not opening MOSFET pipe Q1 and Q2, high-end common source configuration MOSFET pipe Q1 has blocked photovoltaic cell positive charge and the impact on common source; MOSFET pipe Q2 has cut off storage battery reverse charging and the impact on common source, acting on drawing by charge initiation resistance, makes the negative bias node of the source electrode of MOSFET pipe and bootstrap capacitor be positioned at ground, ensures that the initialization of bootstrap capacitor starts and charging.
To sum up, the Bootstrapping drive circuit of the existing general high voltage gate drivers that the present invention solves, when being applied to battery charger, the source electrode of MOSFET pipe and the negative bias node of bootstrap capacitor are positioned on storage battery output voltage, there is bootstrap capacitor initialization and start and limited problem of charging.
The above; be only the present invention's comparatively specific embodiment; but the protection range of invention does not limit to therewith; anyly be familiar with those skilled in the art in the scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept and replace or change, all belonged to protection scope of the present invention.
Claims (6)
1. the MOS Bootstrapping drive circuit of the controller for solar of a common source configuration, it is characterized in that: be made up of main charge circuit (1) and bootstrapping drive circuit (2), main charge circuit (1) is formed by connecting by MOSFET pipe Q1-Q2, resistance R1, diode D1, inductance L 1 and electrochemical capacitor EC1-EC2, and bootstrapping drive circuit (2) is formed by connecting by driving chip IC1, resistance R2-R5, diode D2, electric capacity C1 and electrochemical capacitor EC2; The drain electrode of MOSFET pipe Q2 by inductance L 1 connect storage battery charging input end and by electrochemical capacitor EC2 ground connection, the drain electrode of MOSFET pipe Q1 connects the voltage output end of solar cell and passes through electrochemical capacitor EC1 ground connection, and diode D1 plus earth, negative electrode meet MOSFET pipe Q2 and drain; Pass through resistance R1 ground connection, the source electrode of MOSFET pipe Q1 and the source shorted of MOSFET pipe Q2 after the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2, form common source connect in series structure; Driving chip IC1 has drive control signal input WPM, the power input VDD external power supply VCC of driving chip IC1 and by electric capacity EC3 ground connection, external power supply VCC connects the voltage output end Vb of driving chip IC1 by resistance R, diode D2, the voltage output end Vb of described dynamic chip IC 1 connects the grid of MOSFET pipe Q1 and the grid short circuit place of MOSFET pipe Q2 by electric capacity C1, resistance R5, forms MOS bootstrapping drive circuit; The HO end of driving chip IC1 connects the source electrode of MOSFET pipe Q1 and the source shorted place of MOSFET pipe Q2 by resistance R3, the Vs end of driving chip IC1 connects the grid of MOSFET pipe Q1 and the grid short circuit place of MOSFET pipe Q2 by resistance R5, between the grid of resistance R4 cross-over connection MOSFET pipe Q1 and source electrode, form electricity storage preventing pond reverse charge structure.
2. the MOS Bootstrapping drive circuit of the controller for solar of a kind of common source configuration according to claim 1, it is characterized in that: the drive control signal input WPM of driving chip IC1 inputs the PWM ripple signal of single-chip microcomputer generation, is controlled by this PWM ripple signal.
3. the MOS Bootstrapping drive circuit of the controller for solar of a kind of common source configuration according to claim 1 and 2, it is characterized in that: electric capacity C1 forms bootstrap capacitor, resistance R2 forms charging resistor, pole pipe D2 forms fast recovery diode, fast quick-recovery formula charge circuit is formed by being connected driving chip IC1 voltage output end Vb after resistance 2 and pipe D2 connect, pass through electric capacity C1, resistance R5 by driving chip IC1 voltage output end Vb connect the grid of MOSFET pipe Q1 and the grid short circuit of MOSFET pipe Q2 and pass through resistance R1 ground connection, form bootstrap charge circuit loop.
4. the MOS Bootstrapping drive circuit of the controller for solar of a kind of common source configuration according to claim 3, is characterized in that: electrochemical capacitor EC1-EC3 is filter capacitor.
5. the MOS Bootstrapping drive circuit of the controller for solar of a kind of common source configuration according to claim 3, it is characterized in that: described MOSFET pipe Q1-Q2 is N-type MOSFET pipe, Q1 drain electrode is connected with solar panels+(PV+), and Q2 drain electrode is connected with storage battery by inductance.
6. the MOS Bootstrapping drive circuit of the controller for solar of a kind of common source configuration according to claim 3, is characterized in that: the model of described driving chip IC1 is FAN7371.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510222149.9A CN104917379A (en) | 2015-05-02 | 2015-05-02 | MOS bootstrap driving circuit of solar controller of common-source structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510222149.9A CN104917379A (en) | 2015-05-02 | 2015-05-02 | MOS bootstrap driving circuit of solar controller of common-source structure |
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| CN104917379A true CN104917379A (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510222149.9A Pending CN104917379A (en) | 2015-05-02 | 2015-05-02 | MOS bootstrap driving circuit of solar controller of common-source structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994892A (en) * | 2017-11-28 | 2018-05-04 | 浙江中航通飞研究院有限公司 | A kind of on-off control device of heavy DC circuit |
| CN111865149A (en) * | 2020-09-07 | 2020-10-30 | 珠海格力电器股份有限公司 | Motor control circuit and brushless direct current motor |
-
2015
- 2015-05-02 CN CN201510222149.9A patent/CN104917379A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994892A (en) * | 2017-11-28 | 2018-05-04 | 浙江中航通飞研究院有限公司 | A kind of on-off control device of heavy DC circuit |
| CN111865149A (en) * | 2020-09-07 | 2020-10-30 | 珠海格力电器股份有限公司 | Motor control circuit and brushless direct current motor |
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Application publication date: 20150916 |
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| WD01 | Invention patent application deemed withdrawn after publication |