CN102761257A - Boost converter and control method thereof - Google Patents
Boost converter and control method thereof Download PDFInfo
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- CN102761257A CN102761257A CN2012102605442A CN201210260544A CN102761257A CN 102761257 A CN102761257 A CN 102761257A CN 2012102605442 A CN2012102605442 A CN 2012102605442A CN 201210260544 A CN201210260544 A CN 201210260544A CN 102761257 A CN102761257 A CN 102761257A
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Abstract
The invention discloses a boost converter and a control method thereof. The boost converter comprises a second control unit which is used for controlling the level of the connection point of the cathodes of two diodes of the converter to allow the level to be always in a high level for the input and output of the converter. Due to the adoption of the converter, a problem of electric leakage between the input end and output end of the converter in a closed state in the prior art is solved, and accordingly, unnecessary energy loss of the system is reduced.
Description
Technical field
The present invention relates to electronic circuit field, in particular to a kind of boost converter and control method thereof.
Background technology
Usually boost converter (promptly; The boost transducer) in; As shown in Figure 1, synchronously the body end of pmos fet 1 is directly linked output, is connected load 4 between output and the signal ground; This moment switching node (Switching Node; Be called for short SW) and output between parasitic diode 21 and the negative electrode of parasitic diode 22 be connected to output, like this when boost converter when closing (pmos fet 1 with nmos fet 3 all by) under the control of transistor controller 6, export to drop to and be lower than when importing; Parasitic diode 21 between switching node SW and the output just is in the forward bias state, just has electric current and flows to output from input through inductance and parasitic diode 21.For addressing this problem; There is technology when boost converter is closed, the body end of synchronous pmos fet 1 directly to be linked input or switching node SW; As shown in Figure 2, make parasitic diode 21 and the negative electrode of parasitic diode 22 between switching node SW and the output be connected to input or switching node SW.When dropping to, output is lower than when input; Parasitic diode 22 between switching node SW and the output just is in reverse-bias state; Parasitic diode 21 is in off position, flows to output from input through inductance and parasitic diode 21 thereby guarantee not have electric current.If but output is connected on other power supplys 5 and output during greater than input; As shown in Figure 3; Parasitic diode 22 between switching node SW and the output just is in the forward bias state, just has electric current and flows to input from output through parasitic diode 22 and inductance.
Descend the problem that has electric leakage between input and the output in off position to boost converter in the correlation technique, do not propose effective solution at present as yet.
Summary of the invention
Main purpose of the present invention is to provide a kind of boost converter and control method thereof, and boost converter descends the problem that has electric leakage between input and the output in off position in the prior art to solve.
To achieve these goals, according to an aspect of the present invention, a kind of boost converter is provided, has comprised: input terminal; Power supply is connected between input terminal and the signal ground; Lead-out terminal; Inductance, first end of inductance is connected with input terminal; First FET, the source electrode of first FET is connected with second end of inductance, and the drain electrode of first FET is connected with lead-out terminal; Second FET, the source electrode of second FET is connected with signal ground, and the drain electrode of second FET is connected to switching node, and wherein, switching node is the node between second end of source electrode and inductance of first FET; First control unit is connected respectively with the grid of first FET and the grid of second FET; First diode, the anode of first diode is connected with input terminal; Second diode, the negative electrode of second diode is connected with the negative electrode of first diode, and the anode of second diode is connected with lead-out terminal; Second control unit is connected with first node, be used for first voltage greater than second voltage time output tertiary voltage to first node; And export the 4th voltage to first node during less than second voltage at first voltage, wherein, first node is the node between the negative electrode of negative electrode and second diode of first diode; First voltage is the voltage of input terminal; Second voltage is the voltage of lead-out terminal, and tertiary voltage is more than or equal to first voltage, and the 4th voltage is more than or equal to second voltage.
Further, second control unit comprises: switch module, and the output of switch module is connected with first node, and the first input end of switch module is used to receive tertiary voltage, and second input of switch module is used to receive the 4th voltage; And driver module; Be connected with the control end of switch module; Be used for being connected with the first input end of switch module, and be connected with second input of switch module at the output of first voltage driving switch module during less than second voltage at the output of first voltage driving switch module during greater than second voltage.
Further; Driver module comprises: comparator; Negative-phase input is used to receive first voltage, and normal phase input end is used to receive second voltage, and the output of comparator is connected with the control end of switch module; Be used to send low level signal to switch module and be connected with the first input end of switch module, and send high level signal to switch module and be connected with second input of switch module with the output of driving switch module with the output of driving switch module.
Further; Switch module comprises: first switch; First end of first switch is the first input end of switch module, and second end of first switch is the output of switch module, and the control end of first switch is connected with the output of comparator; Be used for conducting when receiving low level signal, and when receiving high level signal, break off; And second switch; First end of second switch is second input of switch module; Second end of second switch is connected with the output of switch module; The control end of second switch is connected with the output of comparator, is used for when receiving low level signal, breaking off, and conducting when receiving high level signal.
Further; Driver module comprises: comparator; Normal phase input end is used to receive first voltage, and negative-phase input is used to receive second voltage, and the output of comparator is connected with the control end of switch module; Be used to send high level signal to switch module and be connected with the first input end of switch module, and send low level signal to switch module and be connected with second input of switch module with the output of driving switch module with the output of driving switch module.
Further; Switch module comprises: first switch; First end of first switch is the first input end of switch module, and second end of first switch is the output of switch module, and the control end of first switch is connected with the output of comparator; Be used for when receiving low level signal, breaking off, and conducting when receiving high level signal; And second switch; First end of second switch is second input of switch module; Second end of second switch is connected with the output of switch module; The control end of second switch is connected with the output of comparator, is used for conducting when receiving low level signal, and when receiving high level signal, breaks off.
Further, driver module comprises: comparator, negative-phase input are used to receive first voltage, and normal phase input end is used to receive second voltage; Inverter; Be connected with the output of comparator, switch module comprises: first switch, and first end of first switch is the first input end of switch module; Second end of first switch is the output of switch module; The control end of first switch is connected with the output of comparator, is used for conducting when receiving low level signal, and when receiving high level signal, breaks off; And second switch; First end of second switch is second input of switch module; Second end of second switch is connected with the output of switch module; The control end of second switch is connected with the output of inverter, is used for when receiving high level signal, breaking off, and conducting when receiving low level signal.
Further, driver module comprises: comparator, normal phase input end are used to receive first voltage, and negative-phase input is used to receive second voltage; Inverter; Be connected with the output of comparator, switch module comprises: first switch, and first end of first switch is the first input end of switch module; Second end of first switch is the output of switch module; The control end of first switch is connected with the output of comparator, is used for conducting when receiving high level signal, and when receiving low level signal, breaks off; And second switch; First end of second switch is second input of switch module; Second end of second switch is connected with the output of switch module; The control end of second switch is connected with the output of inverter, is used for when receiving low level signal, breaking off, and conducting when receiving high level signal.
To achieve these goals; According to a further aspect in the invention; A kind of control method of boost converter is provided, has comprised: obtained first voltage and second voltage of boost converter under in off position, wherein; First voltage is the voltage of boost converter input terminal, and second voltage is the voltage of boost converter lead-out terminal; The size that compares first voltage and second voltage; At first voltage during greater than second voltage; Node between the negative electrode of output tertiary voltage to the first diode and the negative electrode of second diode; Wherein, first diode and second diode are the parasitic diode of boost converter, and tertiary voltage is more than or equal to first voltage; And at first voltage during, export the node between the negative electrode of negative electrode and second diode of the 4th voltage to the first diode less than second voltage, wherein, the 4th voltage is more than or equal to second voltage.
Further; Boost converter comprises switch module and control module; Wherein, the output of switch module is connected in the node between the negative electrode of negative electrode and second diode of first diode, and the first input end of switch module is used to receive tertiary voltage; Second input of switch module is used to receive the 4th voltage; Driver module is connected with the control end of switch module, and wherein, the node between the negative electrode of exporting tertiary voltage or the 4th voltage to the first diode in the following manner and the negative electrode of second diode: driver module is connected with the first input end of switch module at the output of first voltage driving switch module during greater than second voltage; And driver module is connected with second input of switch module at the output of first voltage driving switch module during less than second voltage.
The present invention is through improving step-up converter circuit of the prior art; Through increasing by second control unit cathode potential of two diodes is controlled; Realized that input voltage makes the cathode voltage of diode equal input voltage when being higher than output voltage; When being higher than input voltage, output voltage make the cathode voltage of diode equal output voltage; Avoid boost converter under the situation that FET ends, still diode current flow to occur and cause transducer electric leakage; Reach the boost converter real disconnection between its input and the output down in off position, solved that there is the problem that existence is leaked electricity between input and the output in off position down in boost converter in the prior art, and then reached the effect of the unnecessary energy loss of reduction system.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is first circuit diagram according to the boost converter of correlation technique;
Fig. 2 is the second circuit figure according to the boost converter of correlation technique;
Fig. 3 is the tertiary circuit figure according to the boost converter of correlation technique;
Fig. 4 is the circuit diagram according to the boost converter of first embodiment of the invention;
Fig. 5 is the circuit diagram according to the boost converter of second embodiment of the invention;
Fig. 6 is the circuit diagram according to the boost converter of third embodiment of the invention; And
Fig. 7 is the flow chart according to the control method of the embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
The embodiment of the invention provides a kind of boost converter, below the boost converter that the embodiment of the invention provided is specifically introduced:
Fig. 4 is the circuit diagram according to the boost converter of first embodiment of the invention; As shown in Figure 4; The boost converter of first embodiment of the invention comprise input terminal, switching node SW, lead-out terminal, PMOS FET 1, NMOS FET 3, diode 21, diode 22, inductance, electric capacity and be connected input terminal and signal ground between the input power supply and be connected lead-out terminal and signal ground between load 4 or power supply 5; Wherein, The voltage of input terminal is VI, and the voltage of lead-out terminal is VO.
Particularly, the source electrode of PMOS FET 1 is connected with switching node SW, and the drain electrode of PMOS FET 1 is connected with lead-out terminal; The source electrode of NMOS FET 3 is connected with signal ground, and the drain electrode of NMOS FET 3 is connected to switching node SW; First control unit 6 (that is transistor controller) is connected respectively with the grid of PMOS FET 1 and the grid of NMOS FET 3; The anode of diode 21 is connected with input terminal; The negative electrode of diode 22 is connected with the negative electrode of diode 21, and the anode of diode 22 is connected with lead-out terminal; Second control unit is connected with first node; Be used for the voltage VI of input terminal during greater than the voltage VO of lead-out terminal the output tertiary voltage to first node; This tertiary voltage is the voltage more than or equal to voltage VI; And export the 4th voltage to first node during less than the voltage VO of lead-out terminal at the voltage VI of input terminal, the 4th voltage is the voltage more than or equal to voltage VO.
The boost converter of first embodiment of the invention is controlled the cathode potential of two diodes through increasing by second control unit; Realized that input voltage makes the cathode voltage of diode equal input voltage when being higher than output voltage; When being higher than input voltage, output voltage make the cathode voltage of diode equal output voltage; Avoid boost converter under the situation that FET ends, still diode current flow to occur and cause transducer electric leakage; Reached the boost converter real disconnection between its input and the output down in off position; Solved that there is the problem that has electric leakage between input and the output in off position down in boost converter in the prior art, and then reached the effect that improves boost converter fail safe, energy loss that the reduction system is unnecessary.
Wherein, second control unit can be made up of driver module and switch module S, and the output of switch module S is connected with first node, and the first input end of switch module S is connected with input terminal, and second input of switch module S is connected with lead-out terminal; Driver module is connected with the control end of switch module S; Be used for being connected with the first input end of switch module S at the output of the voltage VI of input terminal driving switch module S during greater than the voltage VO of lead-out terminal; Be implemented in voltage VI greater than under the situation of voltage VO the voltage VI of input terminal being delivered to first node, realized promptly that also voltage that conveying equates with voltage VI is to first node.Wherein, The first input end of switch module S can not be connected with input terminal yet; But the high potential that connected system adds; Under the situation of voltage VI greater than voltage VO, the voltage of the high potential that system adds is implemented in voltage VI greater than being delivered to first node greater than the voltage of voltage VI under the situation of voltage VO greater than voltage VI.
Driver module also is used for being connected with second input of switch module S at the output of the voltage VI of input terminal driving switch module S during less than the voltage VO of lead-out terminal; Output with at the voltage VI of input terminal driving switch module S during less than the voltage VO of lead-out terminal is connected with second input of switch module S; Be implemented in voltage VI less than under the situation of voltage VO the voltage VO of lead-out terminal being delivered to first node, realized promptly that also voltage that conveying equates with voltage VO is to first node.Wherein, Second input of switch module S can not be connected with lead-out terminal yet; But the high potential that connected system adds; Under the situation of voltage VI less than voltage VO, the voltage of the high potential that system adds is implemented in voltage VI less than being delivered to first node greater than the voltage of voltage VO under the situation of voltage VO greater than voltage VO.
Particularly; Driver module can be comparator 7; Wherein, The negative-phase input of comparator 7 inserts the voltage VI of input terminal, and normal phase input end inserts the voltage VO of lead-out terminal, and the output of comparator 7 is connected with the control end of switch module; Be used to send low level signal to switch module and be connected with the first input end of switch module, and send high level signal to switch module and be connected with second input of switch module with the output of driving switch module with the output of driving switch module.
Further; A kind of substitute mode that is equal to as first embodiment of the invention; The normal phase input end of comparator 7 inserts the voltage VI of input terminal; Negative-phase input inserts the voltage VO of lead-out terminal; The output of comparator 7 is connected with the control end of switch module, is used to send high level signal to switch module and is connected with the first input end of switch module with the output of driving switch module, and send low level signal to switch module and be connected with second input of switch module with the output of driving switch module.Wherein said switch module can also can be the PMOS FET for the NMOS FET, can also constitute the cmos fet pipe by NMOS FET and PMOS FET and constitute.Certainly can also constitute by other elements, here narration no longer one by one.
Be set to the mode of forming through second control unit, realized that solving in the prior art boost converter through less chip area, lower production cost exists down in off position and have the problem of leaking electricity between input and the output by comparator 7 and switch module.
Fig. 5 is the circuit diagram according to the boost converter of second embodiment of the invention; As shown in Figure 5, the difference of the boost converter of second embodiment of the invention and the voltage up converting circuit of the first embodiment of the invention shown in Fig. 4 is: in the boost converter of second embodiment of the invention, switch module comprises first switch S 1 and second switch S2; Wherein, First end of first switch S 1 is the first input end of switch module, that is, first end of first switch S 1 is connected with input terminal; Second end of first switch S 1 is the output of switch module, and the control end of first switch S 1 is connected with the output of comparator 7; First end of second switch S2 is second input of switch module; That is, first end of second switch S2 is connected with lead-out terminal, and second end of second switch S2 is connected with the output of switch module; Promptly; Second end of second switch S2 is connected with second end of first switch S 1, and the connected node of the two can be used as the output of switch module, and the control end of second switch S2 is connected with the output of comparator 7.
Wherein, when the negative-phase input of comparator 7 inserts the voltage VI of input terminal, when normal phase input end inserts the voltage VO of lead-out terminal, select first switch S 1 to satisfy: conducting when receiving low level signal, and when receiving high level signal, break off; Select second switch S2 to satisfy: conducting when receiving high level signal, and when receiving low level signal, break off.When the normal phase input end of comparator 7 inserts the voltage VI of input terminal, when negative-phase input inserts the voltage VO of lead-out terminal, select second switch S2 to satisfy: conducting when receiving low level signal, and when receiving high level signal, break off; Select first switch S 1 to satisfy: conducting when receiving high level signal, and when receiving low level signal, break off.
Fig. 6 is the circuit diagram according to the boost converter of third embodiment of the invention, and is as shown in Figure 6, and the difference of the boost converter of third embodiment of the invention and the voltage up converting circuit of the second embodiment of the invention shown in Fig. 5 is: in the boost converter of third embodiment of the invention; Driver module comprises comparator 7 and inverter 8; Switch module comprises first switch S 1 and second switch S2, and wherein, first end of first switch S 1 is the first input end of switch module; Promptly; First end of first switch S 1 is connected with input terminal, and second end of first switch S 1 is the output of switch module, and the control end of first switch S 1 is connected with the output of comparator 7; First end of second switch S2 is second input of switch module; That is, first end of second switch S2 is connected with lead-out terminal, and second end of second switch S2 is connected with the output of switch module; Promptly; Second end of second switch S2 is connected with second end of first switch S 1, and the connected node of the two can be used as the output of switch module, and the control end of second switch S2 is connected with the output of inverter 8.
Wherein, when the negative-phase input of comparator 7 inserts the voltage VI of input terminal, when normal phase input end inserts the voltage VO of lead-out terminal, select first switch S 1 to satisfy: conducting when receiving low level signal, and when receiving high level signal, break off; Select second switch S2 to satisfy: conducting when receiving low level signal, and when receiving high level signal, break off.When the normal phase input end of comparator 7 inserts the voltage VI of input terminal, when inverting input inserts the voltage VO of lead-out terminal, select second switch S2 to satisfy: conducting when receiving high level signal, and when receiving low level signal, break off; Select first switch S 1 to satisfy: conducting when receiving high level signal, and when receiving low level signal, break off.
The embodiment of the invention also provides a kind of control method of boost converter; This control method can be carried out through any boost converter that embodiment of the invention foregoing is provided, and below the control method of the boost converter that the embodiment of the invention provided is specifically set forth.
Fig. 7 is the flow chart according to the control method of the boost converter of the embodiment of the invention, and is as shown in Figure 7, and this control method comprises that following step S702 is to step S708:
S702: obtain first voltage and second voltage of boost converter under in off position, wherein, first voltage is the voltage of boost converter input terminal, and second voltage is the voltage of boost converter lead-out terminal;
S704: the size that compares first voltage and second voltage;
S706: the node between the negative electrode of the negative electrode of first voltage time output tertiary voltage to the first diode and second diode greater than second voltage; Wherein, First diode and second diode are the parasitic diode of boost converter, and tertiary voltage is the voltage more than or equal to first voltage; And
S708: export the node between the negative electrode of negative electrode and second diode of the 4th voltage to the first diode during less than second voltage at first voltage, wherein, the 4th voltage is the voltage more than or equal to second voltage.
The control method of the boost converter of the embodiment of the invention is through controlling the cathode potential of two diodes; Realized that input voltage makes the cathode voltage of diode be the voltage more than or equal to input voltage when being higher than output voltage; When being higher than input voltage, output voltage make the cathode voltage of diode be voltage more than or equal to output voltage; Avoid boost converter under the situation that FET ends, still diode current flow to occur and cause transducer electric leakage; Reached the boost converter real disconnection between its input and the output down in off position; Solved that there is the problem that has electric leakage between input and the output in off position down in boost converter in the prior art, and then reached the effect that improves boost converter fail safe, energy loss that the reduction system is unnecessary.
Particularly; Output to first voltage or second voltage can be carried out through switch module in the boost converter and control module; Wherein, The output of switch module is connected in the node between the negative electrode of negative electrode and second diode of first diode; The first input end of switch module is used to receive tertiary voltage, and second input of switch module is used to receive the 4th voltage, and driver module is connected with the control end of switch module; Wherein, the node between the negative electrode of exporting tertiary voltage or the 4th voltage to the first diode in the following manner and the negative electrode of second diode: driver module is connected with the first input end of switch module at the output of first voltage driving switch module during greater than second voltage; And driver module is connected with second input of switch module at the output of first voltage driving switch module during less than second voltage.
Comprise comparator shown in Fig. 6 and inverter with driver module, switch module comprises that first switch and second switch are the concrete control method of the example boost converter that is illustrated the embodiment of the invention:
Boost converter gets into closed condition according to shutdown signal after receiving shutdown signal.Pmos fet and nmos fet are all closed synchronously.
Compare through the input voltage and the output voltage of comparator boost converter; Determine the current potential soprano and perhaps directly add high potential by system as high potential; And through control signal this high potential is connected to the negative electrode of the parasitic diode of synchronous pmos fet, this moment in off position down input with export between real disconnecting.Guarantee neither to have electric current from inlet flow to output, do not have yet electric current from output stream to input.
Particularly; For example: when exporting greater than input; Comparator produces the respective logic level; The body end of synchronous pmos fet and the switching tube S1 between the input are ended, make the body end and the 2 pipe conductings of the switch S between the output of synchronous pmos fet, thereby make the negative electrode of parasitic diode be connected to output.When importing greater than output; Comparator produces the respective logic level; The body end and 2 pipes of the switch S between the output of synchronous pmos fet are ended; Make the body end and the 1 pipe conducting of the switch S between the input of synchronous pmos fet, thereby make the negative electrode of parasitic diode be connected to input.So just realized in off position down the real disconnecting between the input and output.
Need to prove; The foregoing description is merely the preferred embodiments of the present invention; The maximum potential of negative electrode that wherein is connected to the parasitic diode of synchronous pmos fet also can be system and adds high potential; Or the high potential that from system, produces (for example: the current potential of switching node SW); Control this high potential and also be not limited only to this, as long as the method that the parasitic diode of synchronous pmos fet is ended all belongs to protection scope of the present invention with the concrete control method that the negative electrode of the parasitic diode of synchronous pmos fet is connected.
In addition, boost converter down, requires quiescent current less than 1uA in off position usually.In order not increase the extra close current of system, the small bias current that is used for the comparator of comparison input and output in the present technique can be provided by output.If the close current of taking into account system not, the small bias current that is used for the comparator of comparison input and output also can be provided by input.
From above description, can find out that the present invention has realized following technique effect:
When boost converter is closed when being in state; Under the situation that does not increase the extra close current of system; Still the comparator that guarantees to be used for the comparison input and output can operate as normal; Thereby realize boost converter neither have down in off position electric current from inlet flow to output, do not have yet electric current from output stream to input, reach real disconnecting between the input and output.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a boost converter is characterized in that, comprising:
Input terminal;
Power supply is connected between said input terminal and the signal ground;
Lead-out terminal;
Inductance, first end of said inductance is connected with said input terminal;
First FET, the source electrode of said first FET is connected with second end of said inductance, and the drain electrode of said first FET is connected with said lead-out terminal;
Second FET; The source electrode of said second FET is connected with said signal ground; The drain electrode of said second FET is connected to switching node, and wherein, said switching node is the node between second end of source electrode and said inductance of said first FET;
First control unit is connected respectively with the grid of said first FET and the grid of said second FET;
First diode, the anode of said first diode is connected with said input terminal;
Second diode, the negative electrode of said second diode is connected with the negative electrode of said first diode, and the anode of said second diode is connected with said lead-out terminal;
Second control unit; Be connected with first node, be used for first voltage greater than second voltage time output tertiary voltage to said first node, and export the 4th voltage to said first node during less than said second voltage at said first voltage; Wherein, Said first node is the node between the negative electrode of negative electrode and said second diode of said first diode, and said first voltage is the voltage of said input terminal, and said second voltage is the voltage of said lead-out terminal; Said tertiary voltage is more than or equal to said first voltage, and said the 4th voltage is more than or equal to said second voltage.
2. boost converter according to claim 1 is characterized in that, said second control unit comprises:
Switch module, the output of said switch module is connected with said first node, and the first input end of said switch module is used to receive said tertiary voltage, and second input of said switch module is used to receive said the 4th voltage; And
Driver module; Be connected with the control end of said switch module; The output that is used for driving during greater than said second voltage at said first voltage said switch module is connected with the first input end of said switch module, and is connected with second input of said switch module at the output that said first voltage drives said switch module during less than said second voltage.
3. boost converter according to claim 2 is characterized in that, said driver module comprises:
Comparator; Negative-phase input is used to receive said first voltage; Normal phase input end is used to receive said second voltage; The output of said comparator is connected with the control end of said switch module, be used to send low level signal to said switch module and be connected with the first input end of said switch module with the output that drives said switch module, and transmission high level signal to said switch module is connected with second input of said switch module with the output that drives said switch module.
4. boost converter according to claim 3 is characterized in that, said switch module comprises:
First switch; First end of said first switch is the first input end of said switch module; Second end of said first switch is the output of said switch module; The control end of said first switch is connected with the output of said comparator, is used for conducting when receiving said low level signal, and when receiving said high level signal, breaks off; And
Second switch; First end of said second switch is second input of said switch module; Second end of said second switch is connected with the output of said switch module; The control end of said second switch is connected with the output of said comparator, is used for when receiving said low level signal, breaking off, and conducting when receiving said high level signal.
5. boost converter according to claim 2 is characterized in that, said driver module comprises:
Comparator; Normal phase input end is used to receive said first voltage; Negative-phase input is used to receive said second voltage; The output of said comparator is connected with the control end of said switch module, be used to send high level signal to said switch module and be connected with the first input end of said switch module with the output that drives said switch module, and transmission low level signal to said switch module is connected with second input of said switch module with the output that drives said switch module.
6. boost converter according to claim 5 is characterized in that, said switch module comprises:
First switch; First end of said first switch is the first input end of said switch module; Second end of said first switch is the output of said switch module; The control end of said first switch is connected with the output of said comparator, is used for when receiving said low level signal, breaking off, and conducting when receiving said high level signal; And
Second switch; First end of said second switch is second input of said switch module; Second end of said second switch is connected with the output of said switch module; The control end of said second switch is connected with the output of said comparator, is used for conducting when receiving said low level signal, and when receiving said high level signal, breaks off.
7. boost converter according to claim 2 is characterized in that,
Said driver module comprises:
Comparator, negative-phase input are used to receive said first voltage, and normal phase input end is used to receive said second voltage;
Inverter is connected with the output of said comparator,
Said switch module comprises:
First switch; First end of said first switch is the first input end of said switch module; Second end of said first switch is the output of said switch module; The control end of said first switch is connected with the output of said comparator, is used for conducting when receiving said low level signal, and when receiving said high level signal, breaks off; And
Second switch; First end of said second switch is second input of said switch module; Second end of said second switch is connected with the output of said switch module; The control end of said second switch is connected with the output of said inverter, is used for when receiving said high level signal, breaking off, and conducting when receiving said low level signal.
8. boost converter according to claim 2 is characterized in that,
Said driver module comprises:
Comparator, normal phase input end are used to receive said first voltage, and negative-phase input is used to receive said second voltage;
Inverter is connected with the output of said comparator,
Said switch module comprises:
First switch; First end of said first switch is the first input end of said switch module; Second end of said first switch is the output of said switch module; The control end of said first switch is connected with the output of said comparator, is used for conducting when receiving said high level signal, and when receiving said low level signal, breaks off; And
Second switch; First end of said second switch is second input of said switch module; Second end of said second switch is connected with the output of said switch module; The control end of said second switch is connected with the output of said inverter, is used for when receiving said low level signal, breaking off, and conducting when receiving said high level signal.
9. the control method of a boost converter is characterized in that, comprising:
Obtain first voltage and second voltage of boost converter under in off position, wherein, said first voltage is the voltage of said boost converter input terminal, and said second voltage is the voltage of said boost converter lead-out terminal;
The size of more said first voltage and said second voltage;
At said first voltage during greater than said second voltage; Node between the negative electrode of output tertiary voltage to the first diode and the negative electrode of second diode; Wherein, Said first diode and said second diode are the parasitic diode of said boost converter, and said tertiary voltage is more than or equal to said first voltage; And
At said first voltage during less than said second voltage, export the node between the negative electrode of negative electrode and said second diode of the 4th voltage to said first diode, wherein, said the 4th voltage is more than or equal to said second voltage.
10. control method according to claim 9; It is characterized in that said boost converter comprises switch module and control module, wherein; The output of said switch module is connected in the node between the negative electrode of negative electrode and said second diode of said first diode; The first input end of said switch module is used to receive said tertiary voltage, and second input of said switch module is used to receive said the 4th voltage, and said driver module is connected with the control end of said switch module; Wherein, export node between the negative electrode of said tertiary voltage or said the 4th voltage to negative electrode of said first diode and said second diode in the following manner:
Said driver module is connected with the first input end of said switch module at the output that said first voltage drives said switch module during greater than said second voltage; And
Said driver module is connected with second input of said switch module at the output that said first voltage drives said switch module during less than said second voltage.
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Application publication date: 20121031 |