CN104578705A - Control circuit of power conversion circuit and relevant capacitor charging circuit - Google Patents
Control circuit of power conversion circuit and relevant capacitor charging circuit Download PDFInfo
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- CN104578705A CN104578705A CN201310495090.1A CN201310495090A CN104578705A CN 104578705 A CN104578705 A CN 104578705A CN 201310495090 A CN201310495090 A CN 201310495090A CN 104578705 A CN104578705 A CN 104578705A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a control circuit of a power conversion circuit and a relevant capacitor charging circuit. The capacitor charging circuit used for the power conversion circuit and provided by the embodiment of the invention comprises a clock generation circuit for generating a clock signal, a second diode coupled between an adjusting circuit and a third node, a third diode coupled between the third node and a second node, a first switch coupled between a first node and a fourth node, a second switch coupled between the fourth node and a fixed potential end, a first drive circuit used for controlling the first switch according to the clock signal, a second drive circuit used for controlling the second switch according to the clock signal, and a charging capacitor coupled between the third node and the fourth node. When the clock signal is positioned at a first potential, the first drive circuit is used for turning off the first switch and the second drive circuit is used for turning on the second switch; when the clock signal is positioned at a second potential, the first drive circuit is used for turning on the first switch and the second drive circuit is used for turning off the second switch, thereby ensuring that sufficient electric charges of a bootstrap capacitor can be maintained.
Description
Technical field
Regarding power source change-over circuit of the present invention (power converter), espespecially a kind ofly guarantees the control circuit of the power switch energy normal operation of power-switching circuit and relevant capacitor charging circuit.
Background technology
Utilizing nmos pass transistor in some power-switching circuit realizing power switch, when if desired switch on the bridge being operated in the state of higher load ratio (such as 100% duty ratio), then usually need in power-switching circuit, set up a bootstrap capacitor (bootstrap capacitor) and corresponding capacitor charging circuit, the additional charge needed for switch on the bridge running just can be provided.The framework of capacitor charging circuit is more complicated, needed for the circuit area that takies just larger.
In addition, in order to improve energy use efficiency, the designer trends that electricity-saving operation mode becomes power-switching circuit are gradually supported.When power-switching circuit enters electricity-saving operation mode, switch on the bridge and bridge switch all can be closed.In this stage, the electric charge stored by bootstrap capacitor can be consumed gradually by other elements in power-switching circuit.Therefore, when power-switching circuit to leave electricity-saving operation mode enter normal manipulation mode time, often can cannot open switch on the bridge smoothly because the quantity of electric charge of bootstrap capacitor is not enough, cause power-switching circuit the situation of normal operation to occur.
Summary of the invention
In view of this, how to provide framework to simplify and can guarantee that bootstrap capacitor leaves the control circuit and relevant capacitor charging circuit that are maintained enough electric charges when electricity-saving operation mode enters normal manipulation mode at power-switching circuit, in fact for industry has problem to be solved.
This specification provides a kind of embodiment of the control circuit for a power-switching circuit.This power-switching circuit comprises a switch on the bridge, a bridge switch, a bootstrap capacitor and an inductance, wherein, this switch on the bridge is coupled between an input of this power-switching circuit and a first node, this bridge switch is coupled between this first node and a fixed potential end, this bootstrap capacitor is coupled between this first node and a Section Point, and this inductance is coupled between this first node and an output of this power-switching circuit.This control circuit comprises: a regulating circuit, for coupling this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage; One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, be coupled to this control signal produce circuit, this first node, with this Section Point, and for coupling this switch on the bridge, wherein, on this, bridge drive circuit is arranged to control this switch on the bridge according to this control signal; Bridge drive circuit once, is coupled to this control signal and produces circuit, and for coupling this bridge switch, wherein, this lower bridge drive circuit is arranged to control this bridge switch according to this control signal; And a capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, with this Section Point, wherein, this capacitor charging circuit is arranged in when receiving this regulation voltage and stores electric charge, and when receiving the voltage of this first node, stored electric charge is transferred to this bootstrap capacitor via this Section Point, to charge to this bootstrap capacitor.
This specification separately provides a kind of embodiment of the control circuit for a power-switching circuit.This power-switching circuit comprises a bootstrap capacitor and an inductance, and wherein, this bootstrap capacitor is coupled between a first node and a Section Point, and this inductance is coupled between this first node and an output of this power-switching circuit.This control circuit comprises: a switch on the bridge, is coupled between an input of this power-switching circuit and this first node; One bridge switch, is coupled between this first node and a fixed potential end; One regulating circuit, is coupled to this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage; One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, is coupled between this output of this first diode and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal; Bridge drive circuit once, is coupled to this control signal and produces between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal; And a capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, with this Section Point, be arranged in when receiving this regulation voltage and store electric charge, and when receiving the voltage of this first node, stored electric charge is transferred to this bootstrap capacitor via this Section Point, to charge to this bootstrap capacitor.
This specification separately provides a kind of embodiment of the control circuit for a power-switching circuit.This power-switching circuit comprises an inductance, and wherein, this inductance is coupled between a first node and an output of this power-switching circuit.This control circuit comprises: a switch on the bridge, is coupled between an input of this power-switching circuit and this first node; One bridge switch, is coupled between this first node and a fixed potential end; One bootstrap capacitor, is coupled between this first node and a Section Point; One regulating circuit, is coupled to this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage; One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, is coupled between this output of this first diode and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal; Bridge drive circuit once, is coupled to this control signal and produces between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal; And a capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, with this Section Point, be arranged in when receiving this regulation voltage and store electric charge, and when receiving the voltage of this first node, stored electric charge is transferred to this bootstrap capacitor via this Section Point, to charge to this bootstrap capacitor.
This specification separately provides a kind of embodiment of the control circuit for a power-switching circuit.This power-switching circuit comprises a switch on the bridge, a bridge switch, a bootstrap capacitor, an inductance and a charging capacitor, wherein, this switch on the bridge is coupled between an input of this power-switching circuit and a first node, this bridge switch is coupled between this first node and a fixed potential end, this bootstrap capacitor is coupled between this first node and a Section Point, this inductance is coupled between this first node and an output of this power-switching circuit, and this charging capacitor is coupled between one the 3rd node and one the 4th node.This control circuit comprises: a regulating circuit, is coupled to this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage; One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, be coupled to this output of this first diode, this control signal produce circuit, with this first node, and for coupling this switch on the bridge, wherein, on this, bridge drive circuit is arranged to control this switch on the bridge according to this control signal; Bridge drive circuit once, is coupled to this control signal and produces circuit, and for coupling this bridge switch, wherein, this lower bridge drive circuit is arranged to control this bridge switch according to this control signal; And a capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, this Section Point, the 3rd node, with the 4th node, wherein, this capacitor charging circuit is arranged in when receiving this regulation voltage and is stored to this charging capacitor via the 3rd node-node transmission by electric charge, and when receiving the voltage of this first node, electric charge stored by this charging capacitor is transferred to this bootstrap capacitor, to charge to this bootstrap capacitor via the 3rd node and this Section Point.
This specification provides a kind of embodiment of the capacitor charging circuit for a power-switching circuit.This power-switching circuit comprises a switch on the bridge, is coupled between an input of this power-switching circuit and a first node; One bridge switch, is coupled between this first node and a fixed potential end; One bootstrap capacitor, is coupled between this first node and a Section Point; One inductance, is coupled between this first node and an output of this power-switching circuit; One regulating circuit, is arranged to regulate the input voltage on this input of this power-switching circuit, to produce a regulation voltage; One first diode, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, is coupled between this Section Point and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal; And once bridge drive circuit, be coupled to this control signal and produce between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal.This capacitor charging circuit comprises: a clock generation circuit, is arranged to generation one clock signal; One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode couples one the 3rd node; One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point; One first switch, is coupled between this first node and one the 4th node; One second switch, is coupled between the 4th node and a fixed potential end; One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal; One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal; And a charging capacitor, be coupled between the 3rd node and the 4th node; Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
This specification separately provides a kind of embodiment of the capacitor charging circuit for a power-switching circuit.This power-switching circuit comprises a switch on the bridge, is coupled between an input of this power-switching circuit and a first node; One bridge switch, is coupled between this first node and a fixed potential end; One bootstrap capacitor, is coupled between this first node and a Section Point; One inductance, is coupled between this first node and an output of this power-switching circuit; One charging capacitor, is coupled between one the 3rd node and one the 4th node; One regulating circuit, is arranged to regulate the input voltage on this input of this power-switching circuit, to produce a regulation voltage; One first diode, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, is coupled between this Section Point and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal; Bridge drive circuit once, is coupled to this control signal and produces between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal.This capacitor charging circuit comprises: a clock generation circuit, is arranged to generation one clock signal; One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to the 3rd node; One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point; One first switch, is coupled between this first node and the 4th node; One second switch, is coupled between the 4th node and a fixed potential end; One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal; And one second drive circuit, be coupled between this clock generation circuit and this second switch, be arranged to control this second switch according to this clock signal; Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
One of advantage of above-described embodiment, that capacitor charging circuit can when power-switching circuit enters electricity-saving operation mode, continue to charge to bootstrap capacitor, be maintained enough electric charges to guarantee that bootstrap capacitor leaves when electricity-saving operation mode enters normal manipulation mode at power-switching circuit, be able to smooth conducting to make switch on the bridge.
Another advantage of above-described embodiment is the electric charge that capacitor charging circuit can provide bootstrap capacitor enough, is continued the mode of operation maintaining 100% duty ratio to make switch on the bridge.
Another advantage of above-described embodiment, is that the framework of capacitor charging circuit is simplified, can saves required circuit area, reduces element complexity and the cost of control circuit and power-switching circuit by this.
Other advantages of the present invention will explain orally in more detail by the following description and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present application, and form a application's part, the schematic description and description of the application, for explaining the application, does not form the improper restriction to the application.
Fig. 1 to Fig. 8 is the functional block diagram after the power-switching circuit of different embodiments of the invention simplifies.
[symbol description]
100,200,300,400,500,600,700,800 power-switching circuits
110 control circuits
111 regulating circuits
112,162,163 diodes
113 control signals produce circuit
Bridge drive circuit on 114
115 times bridge drive circuits
116 capacitor charging circuits
120 switch on the bridges
130 bridge switchs
140 bootstrap capacitors
152 inductance
154 output capacitances
156 loads
161 clock generation circuits
164,165 switches
166,167 drive circuits
168 charging capacitors
269 circuit for detecting
Embodiment
Below cooperation relevant drawings is illustrated embodiments of the invention.In the accompanying drawings, identical label represents same or similar element or method flow.
Fig. 1 is the functional block diagram after the power-switching circuit 100 of one embodiment of the invention simplifies.Power-switching circuit 100 comprises control circuit 110, switch on the bridge 120, bridge switch 130, bootstrap capacitor (bootstrap capacitor) 140, inductance 152, output capacitance 154 and load 156.Control circuit 110 is coupled to switch on the bridge 120 and bridge switch 130, is arranged to the running controlling switch on the bridge 120 and bridge switch 130.Switch on the bridge 120 is coupled between the input of power-switching circuit 100 and first node LX.Bridge switch 130 is coupled between first node LX and fixed potential end (such as earth terminal).Bootstrap capacitor 140 is coupled between first node LX and Section Point BOOT.Inductance 152 is coupled between the output of first node LX and power-switching circuit 100.Output capacitance 154 is coupled to the output of power-switching circuit 100, in order to reduce the noise in the output signal VOUT of power-switching circuit 100.Load 156 is coupled to the output of power-switching circuit 100.
In the present embodiment, aforesaid switch on the bridge 120 and bridge switch 130 are all realize with nmos pass transistor.
As shown in Figure 1, control circuit 110 comprises regulating circuit 111, first diode 112, control signal produces circuit 113, upper bridge drive circuit 114, lower bridge drive circuit 115 and capacitor charging circuit 116.Regulating circuit 111 for coupling the input of power-switching circuit 100, and is arranged to regulate the input voltage VIN on the input of power-switching circuit 100, to produce regulation voltage (regulatedvoltage) PVDD.The input of the first diode 112 is coupled to the output of regulating circuit 111, and the output of the first diode 112 is coupled to Section Point BOOT.Control signal produces circuit 113 and is arranged to produce control signal CTL.Upper bridge drive circuit 114 be coupled to control signal produce circuit 113, first node LX, with Section Point BOOT, and for coupling switch on the bridge 120.Lower bridge drive circuit 115 is coupled to control signal and produces circuit 113, and for coupling bridge switch 130.Upper bridge drive circuit 114 is arranged to control switch on the bridge 120 according to control signal CTL, and lower bridge drive circuit 115 is then arranged to control bridge switch 130 according to control signal CTL.Capacitor charging circuit 116 be coupled to the output of regulating circuit 111, first node LX, with Section Point BOOT.Capacitor charging circuit 116 is arranged in when receiving regulation voltage PVDD and stores electric charge, and when receiving the voltage of first node LX, stored electric charge is transferred to bootstrap capacitor 140 via Section Point BOOT, to charge to bootstrap capacitor 140.
In implementation, control signal produces circuit 113 and can realize with pwm signal generator, or realizes with PFM signal generator.
In the embodiment in figure 1, capacitor charging circuit 116 comprises clock generation circuit 161, second diode 162, the 3rd diode 163, first switch 164, second switch 165, first drive circuit 166, second drive circuit 167 and charging capacitor 168.Clock generation circuit 161 is arranged to clocking CLK.The input of the second diode 162 is coupled to the output of regulating circuit 111, and the output of the second diode 162 is coupled to the 3rd Node B T.The input of the 3rd diode 163 is coupled to the 3rd Node B T, and the output of the 3rd diode 163 is coupled to Section Point BOOT.First switch 164 is coupled between first node LX and the 4th node PH.Second switch 165 is coupled between the 4th node PH and fixed potential end.First drive circuit 166 is coupled between the 3rd Node B T and the 4th node PH, and is coupled between clock generation circuit 161 and the first switch 164.Second drive circuit 167 is coupled between clock generation circuit 161 and second switch 165.First drive circuit 166 is arranged to control the first switch 164, second drive circuit 167 according to clock signal clk and is then arranged to control second switch 165 according to clock signal clk.Charging capacitor 168 is coupled between the 3rd Node B T and the 4th node PH.
In implementation, the first switch 164 can realize with the transistor of identical type with second switch 165, also can realize with dissimilar transistor respectively.Such as, the first switch 164 and second switch 165 all can realize with nmos pass transistor.
When the clock signal clk that clock generation circuit 161 exports is in one first current potential (such as high potential), the first drive circuit 166 can cut out (turn off) first switch 164 and the second drive circuit 167 can conducting (turn on) second switch 165.Now, the regulation voltage PVDD that regulating circuit 111 produces can conduct to charging capacitor 168, to charge to charging capacitor 168 via the second diode 162 and the 3rd Node B T.That is capacitor charging circuit 116 can when receiving regulation voltage PVDD, and the electric charge transmitted by regulating circuit 111 is transferred to charging capacitor 168 via the second diode 162 and the 3rd Node B T and stores.
When clock signal clk is in one second current potential (such as electronegative potential), conducting first switch 164 understood by the first drive circuit 166 and the second drive circuit 167 can cut out second switch 165.Now, voltage on first node LX can conduct to charging capacitor 168 via the first switch 164 and the 4th node PH, by this voltage of the 3rd Node B T is risen, the electric charge in charging capacitor 168 is made to be transferred to bootstrap capacitor 140, to charge to bootstrap capacitor 140 via the 3rd Node B T, the 3rd diode 163 and Section Point BOOT.That is, capacitor charging circuit 116 can when receiving the voltage of first node LX, electric charge stored in charging capacitor 168 is transferred to bootstrap capacitor 140 via the 3rd Node B T, the 3rd diode 163 and Section Point BOOT, to charge to bootstrap capacitor 140, maintain the voltage of Section Point BOOT.
When switch on the bridge 120 needs to continue the mode of operation being in 100% duty ratio, the capacitor charging circuit 116 of control circuit 110 intermittently can charge to bootstrap capacitor 140 according to clock signal clk, the electric charge that bootstrap capacitor 140 is enough is provided by this, maintains the mode of operation of 100% duty ratio to make switch on the bridge 120 be continued.
On the other hand, when power-switching circuit 100 enters electricity-saving operation mode, that is switch on the bridge 120 and bridge switch 130 are when all closing, the capacitor charging circuit 116 of control circuit 110 intermittently can charge to bootstrap capacitor 140 according to clock signal clk equally.Thus, just can guarantee that bootstrap capacitor 140 leaves when electricity-saving operation mode enters normal manipulation mode at power-switching circuit 100 and be maintained enough electric charges, be able to smooth conducting to make switch on the bridge 120.
In other words, by the running of the capacitor charging circuit 116 in aforementioned control circuit 110, no matter be the mode of operation that switch on the bridge 120 needs to continue to be in 100% duty ratio, or power-switching circuit 100 will leave when electricity-saving operation mode enters normal manipulation mode, can guarantee that bootstrap capacitor 140 has enough electric charges, make switch on the bridge 120 and bridge switch 130 energy smooth operation.
Because the framework of aforementioned capacitor charging circuit 116 is quite simplified, therefore required circuit area can be saved, reduce element complexity and the cost of control circuit 110 and power-switching circuit 100 by this.
Fig. 2 is the functional block diagram after the power-switching circuit 200 of another embodiment of the present invention simplifies.Power-switching circuit 200 is very similar with aforesaid power-switching circuit 100, and the essential difference of two embodiments is that the capacitor charging circuit 116 in Fig. 2 separately comprises the circuit for detecting 269 be coupled between control signal generation circuit 113 and clock generation circuit 161.Circuit for detecting 269 be arranged to detection control signal CTL with control clock generation circuit 161 adjust the frequency of clock signal clk and duty ratio at least one of them.
Such as, when circuit for detecting 269 detection control signal CTL finds that switch on the bridge 120 is in the mode of operation of 100% duty ratio, circuit for detecting 269 can control clock generation circuit 161 increase the frequency of clock signal clk and duty ratio at least one of them.When circuit for detecting 269 detection control signal CTL finds that switch on the bridge 120 and bridge switch 130 are all in closed condition, circuit for detecting 269 can control clock generation circuit 161 downgrade the frequency of clock signal clk and duty ratio at least one of them.
In implementation, circuit for detecting 269 also can only detect switch on the bridge 120 be in the mode of operation of 100% duty ratio or switch on the bridge 120 and bridge switch 130 be all in closed condition time, just control clock generation circuit 161 clock signal CLK to the first switch 164 and second switch 165, with the running of activation (enable) capacitor charging circuit 116.
The explanation of the function mode of other counter element in aforementioned regarding power source change-over circuit 100, execution mode and associated advantages, is also applicable in power-switching circuit 200.For simplicity's sake, at this not repeated description.
In implementation, the difference in functionality square in foregoing embodiments can be incorporated in same circuit chip, to simplify the line architecture of power-switching circuit.
Such as, can, by the switch on the bridge 120 of power-switching circuit 100 and bridge switch 130, be incorporated in control circuit 110 all in the lump, to form the framework of the power-switching circuit 300 in Fig. 3.
Again such as, can, by the switch on the bridge 120 of power-switching circuit 200 and bridge switch 130, be incorporated in control circuit 110 all in the lump, to form the framework of the power-switching circuit 400 in Fig. 4.
Again such as, can, by the switch on the bridge 120 of power-switching circuit 100, bridge switch 130 and bootstrap capacitor 140, be incorporated in control circuit 110 all in the lump, to form the framework of the power-switching circuit 500 in Fig. 5.
Again such as, can, by the switch on the bridge 120 of power-switching circuit 200, bridge switch 130 and bootstrap capacitor 140, be incorporated in control circuit 110 all in the lump, to form the framework of the power-switching circuit 600 in Fig. 6.
In addition, also the charging capacitor 168 in power-switching circuit 100 independently can be arranged at outside control circuit 110, to form the framework of the power-switching circuit 700 in Fig. 7.
Similarly, also the charging capacitor 168 in power-switching circuit 200 independently can be arranged at outside control circuit 110, to form the framework of the power-switching circuit 800 in Fig. 8.
The explanation of the function mode of other counter element in aforementioned regarding power source change-over circuit 100, execution mode and associated advantages, is also applicable in power-switching circuit 300,500 and 700.In addition, the function mode of circuit for detecting 269 in aforementioned regarding power source change-over circuit 200 and the explanation of associated advantages, be also applicable in power-switching circuit 400,600 and 800.
Some vocabulary is employed to censure specific element in specification and claims.But person of ordinary skill in the field should understand, same element may be called with different nouns.Specification and claims not using the difference of title as the mode of distinguish one element from another, but are used as the benchmark of differentiation with element difference functionally." comprising " mentioned by specification and claims is open term, therefore should be construed to " comprise but be not limited to ".In addition, " couple " and comprise directly any at this and indirectly connect means.Therefore, if describe the first element in literary composition to be coupled to the second element, then represent the first element by being electrically connected or the signal such as wireless transmission, optical delivery connected mode and be directly connected to the second element, or by other elements or connection means indirectly electrically or signal be connected to this second element.
Used herein " and/or " describing mode, comprise the combination in any of cited one of them or multiple project.In addition, unless specialized in specification, otherwise the term of any odd number lattice comprises the connotation of plural lattice all simultaneously.
" voltage signal " in specification and claims, can adopt voltage form or current forms to realize on the implementation." current signal " in specification and claims, also voltage available form or current forms realize on the implementation.
These are only preferred embodiment of the present invention, all equalizations done according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. the control circuit for a power-switching circuit, it is characterized in that, this power-switching circuit comprises a switch on the bridge, a bridge switch, a bootstrap capacitor and an inductance, wherein, this switch on the bridge is coupled between an input of this power-switching circuit and a first node, this bridge switch is coupled between this first node and a fixed potential end, this bootstrap capacitor is coupled between this first node and a Section Point, and this inductance is coupled between this first node and an output of this power-switching circuit, this control circuit comprises:
One regulating circuit, for coupling this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage;
One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point;
One control signal produces circuit, is arranged to generation one control signal;
Bridge drive circuit on one, be coupled to this control signal produce circuit, this first node, with this Section Point, and for coupling this switch on the bridge, wherein, on this, bridge drive circuit is arranged to control this switch on the bridge according to this control signal;
Bridge drive circuit once, is coupled to this control signal and produces circuit, and for coupling this bridge switch, wherein, this lower bridge drive circuit is arranged to control this bridge switch according to this control signal; And
One capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, with this Section Point, wherein, this capacitor charging circuit is arranged in when receiving this regulation voltage and stores electric charge, and when receiving the voltage of this first node, stored electric charge is transferred to this bootstrap capacitor via this Section Point, to charge to this bootstrap capacitor.
2. control circuit as claimed in claim 1, it is characterized in that, this capacitor charging circuit comprises:
One clock generation circuit, is arranged to generation one clock signal;
One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to one the 3rd node;
One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point;
One first switch, is coupled between this first node and one the 4th node;
One second switch, is coupled between the 4th node and a fixed potential end;
One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal;
One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal; And
One charging capacitor, is coupled between the 3rd node and the 4th node;
Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
3. control circuit as claimed in claim 2, it is characterized in that, this capacitor charging circuit separately comprises:
One circuit for detecting, is coupled to this control signal and produces between circuit and this clock generation circuit, be arranged to detect this control signal with control this clock generation circuit adjust the frequency of this clock signal and duty ratio at least one of them.
4. the control circuit for a power-switching circuit, it is characterized in that, this power-switching circuit comprises a bootstrap capacitor and an inductance, wherein, this bootstrap capacitor is coupled between a first node and a Section Point, and this inductance is coupled between this first node and an output of this power-switching circuit, this control circuit comprises:
One switch on the bridge, is coupled between an input of this power-switching circuit and this first node;
One bridge switch, is coupled between this first node and a fixed potential end;
One regulating circuit, is coupled to this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage;
One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point;
One control signal produces circuit, is arranged to generation one control signal;
Bridge drive circuit on one, is coupled between this output of this first diode and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal;
Bridge drive circuit once, is coupled to this control signal and produces between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal; And
One capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, with this Section Point, be arranged in when receiving this regulation voltage and store electric charge, and when receiving the voltage of this first node, stored electric charge is transferred to this bootstrap capacitor via this Section Point, to charge to this bootstrap capacitor.
5. control circuit as claimed in claim 4, it is characterized in that, this capacitor charging circuit comprises:
One clock generation circuit, is arranged to generation one clock signal;
One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to one the 3rd node;
One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point;
One first switch, is coupled between this first node and one the 4th node;
One second switch, is coupled between the 4th node and a fixed potential end;
One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal;
One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal; And
One charging capacitor, is coupled between the 3rd node and the 4th node;
Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
6. control circuit as claimed in claim 5, it is characterized in that, this capacitor charging circuit separately comprises:
One circuit for detecting, is coupled to this control signal and produces between circuit and this clock generation circuit, be arranged to detect this control signal with control this clock generation circuit adjust the frequency of this clock signal and duty ratio at least one of them.
7. for a control circuit for a power-switching circuit, it is characterized in that, this power-switching circuit comprises an inductance, and wherein, this inductance is coupled between a first node and an output of this power-switching circuit, and this control circuit comprises:
One switch on the bridge, is coupled between an input of this power-switching circuit and this first node;
One bridge switch, is coupled between this first node and a fixed potential end;
One bootstrap capacitor, is coupled between this first node and a Section Point;
One regulating circuit, is coupled to this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage;
One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point;
One control signal produces circuit, is arranged to generation one control signal;
Bridge drive circuit on one, is coupled between this output of this first diode and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal;
Bridge drive circuit once, is coupled to this control signal and produces between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal; And
One capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, with this Section Point, be arranged in when receiving this regulation voltage and store electric charge, and when receiving the voltage of this first node, stored electric charge is transferred to this bootstrap capacitor via this Section Point, to charge to this bootstrap capacitor.
8. control circuit as claimed in claim 7, it is characterized in that, this capacitor charging circuit comprises:
One clock generation circuit, is arranged to generation one clock signal;
One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to one the 3rd node;
One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point;
One first switch, is coupled between this first node and one the 4th node;
One second switch, is coupled between the 4th node and a fixed potential end;
One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal;
One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal; And
One charging capacitor, is coupled between the 3rd node and the 4th node;
Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
9. control circuit as claimed in claim 8, it is characterized in that, this capacitor charging circuit separately comprises:
One circuit for detecting, is coupled to this control signal and produces between circuit and this clock generation circuit, be arranged to detect this control signal with control this clock generation circuit adjust the frequency of this clock signal and duty ratio at least one of them.
10. the control circuit for a power-switching circuit, it is characterized in that, this power-switching circuit comprises a switch on the bridge, one bridge switch, one bootstrap capacitor, one inductance, and a charging capacitor, wherein, this switch on the bridge is coupled between an input of this power-switching circuit and a first node, this bridge switch is coupled between this first node and a fixed potential end, this bootstrap capacitor is coupled between this first node and a Section Point, this inductance is coupled between this first node and an output of this power-switching circuit, and this charging capacitor is coupled between one the 3rd node and one the 4th node, this control circuit comprises:
One regulating circuit, is coupled to this input of this power-switching circuit, and is arranged to regulate an input voltage, to produce a regulation voltage;
One first diode, wherein, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point;
One control signal produces circuit, is arranged to generation one control signal;
Bridge drive circuit on one, be coupled to this output of this first diode, this control signal produce circuit, with this first node, and for coupling this switch on the bridge, wherein, on this, bridge drive circuit is arranged to control this switch on the bridge according to this control signal;
Bridge drive circuit once, is coupled to this control signal and produces circuit, and for coupling this bridge switch, wherein, this lower bridge drive circuit is arranged to control this bridge switch according to this control signal; And
One capacitor charging circuit, be coupled to this output of this regulating circuit, this first node, this Section Point, the 3rd node, with the 4th node, wherein, this capacitor charging circuit is arranged in when receiving this regulation voltage and is stored to this charging capacitor via the 3rd node-node transmission by electric charge, and when receiving the voltage of this first node, electric charge stored by this charging capacitor is transferred to this bootstrap capacitor, to charge to this bootstrap capacitor via the 3rd node and this Section Point.
11. as the control circuit of claim 10, and it is characterized in that, this capacitor charging circuit comprises:
One clock generation circuit, is arranged to generation one clock signal;
One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to the 3rd node;
One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point;
One first switch, is coupled between this first node and the 4th node;
One second switch, is coupled between the 4th node and a fixed potential end;
One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal; And
One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal;
Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
12. as the control circuit of claim 11, and it is characterized in that, this capacitor charging circuit separately comprises:
One circuit for detecting, is coupled to this control signal and produces between circuit and this clock generation circuit, be arranged to detect this control signal with control this clock generation circuit adjust the frequency of this clock signal and duty ratio at least one of them.
13. 1 kinds, for the capacitor charging circuit of a power-switching circuit, is characterized in that, this power-switching circuit comprises a switch on the bridge, are coupled between an input of this power-switching circuit and a first node; One bridge switch, is coupled between this first node and a fixed potential end; One bootstrap capacitor, is coupled between this first node and a Section Point; One inductance, is coupled between this first node and an output of this power-switching circuit; One regulating circuit, is arranged to regulate the input voltage on this input of this power-switching circuit, to produce a regulation voltage; One first diode, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, is coupled between this Section Point and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal; And once bridge drive circuit, be coupled to this control signal and produce between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal; This capacitor charging circuit comprises:
One clock generation circuit, is arranged to generation one clock signal;
One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to one the 3rd node;
One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point;
One first switch, is coupled between this first node and one the 4th node;
One second switch, is coupled between the 4th node and a fixed potential end;
One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal;
One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal; And
One charging capacitor, is coupled between the 3rd node and the 4th node;
Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
14., as the capacitor charging circuit of claim 13, is characterized in that, separately comprise:
One circuit for detecting, is coupled to this control signal and produces between circuit and this clock generation circuit, be arranged to detect this control signal with control this clock generation circuit adjust the frequency of this clock signal and duty ratio at least one of them.
15. 1 kinds, for the capacitor charging circuit of a power-switching circuit, is characterized in that, this power-switching circuit comprises a switch on the bridge, are coupled between an input of this power-switching circuit and a first node; One bridge switch, is coupled between this first node and a fixed potential end; One bootstrap capacitor, is coupled between this first node and a Section Point; One inductance, is coupled between this first node and an output of this power-switching circuit; One charging capacitor, is coupled between one the 3rd node and one the 4th node; One regulating circuit, is arranged to regulate the input voltage on this input of this power-switching circuit, to produce a regulation voltage; One first diode, an input of this first diode is coupled to an output of this regulating circuit, and an output of this first diode is coupled to this Section Point; One control signal produces circuit, is arranged to generation one control signal; Bridge drive circuit on one, is coupled between this Section Point and this first node, and is coupled between this control signal generation circuit and this switch on the bridge, is arranged to control this switch on the bridge according to this control signal; Bridge drive circuit once, is coupled to this control signal and produces between circuit and this bridge switch, be arranged to control this bridge switch according to this control signal; This capacitor charging circuit comprises:
One clock generation circuit, is arranged to generation one clock signal;
One second diode, wherein, an input of this second diode is coupled to this output of this regulating circuit, and an output of this second diode is coupled to the 3rd node;
One the 3rd diode, wherein, an input of the 3rd diode is coupled to the 3rd node, and an output of the 3rd diode is coupled to this Section Point;
One first switch, is coupled between this first node and the 4th node;
One second switch, is coupled between the 4th node and a fixed potential end;
One first drive circuit, is coupled between the 3rd node and the 4th node, and is coupled between this clock generation circuit and this first switch, is arranged to control this first switch according to this clock signal; And
One second drive circuit, is coupled between this clock generation circuit and this second switch, is arranged to control this second switch according to this clock signal;
Wherein, when this clock signal is in first current potential, this first drive circuit can cut out this first switch and this second switch of this second drive circuit meeting conducting, and when this clock signal is in second current potential, this first switch of conducting understood by this first drive circuit and this second drive circuit can cut out this second switch.
16., as the capacitor charging circuit of claim 15, is characterized in that, separately comprise:
One circuit for detecting, is coupled to this control signal and produces between circuit and this clock generation circuit, be arranged to detect this control signal with control this clock generation circuit adjust the frequency of this clock signal and duty ratio at least one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310495090.1A CN104578705A (en) | 2013-10-21 | 2013-10-21 | Control circuit of power conversion circuit and relevant capacitor charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310495090.1A CN104578705A (en) | 2013-10-21 | 2013-10-21 | Control circuit of power conversion circuit and relevant capacitor charging circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104578705A true CN104578705A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310495090.1A Pending CN104578705A (en) | 2013-10-21 | 2013-10-21 | Control circuit of power conversion circuit and relevant capacitor charging circuit |
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| CN106549568A (en) * | 2016-12-09 | 2017-03-29 | 芯洲科技（北京）有限公司 | A kind of switching device drive circuit, method and boostrap circuit |
| CN111146768A (en) * | 2018-11-05 | 2020-05-12 | 瑞昱半导体股份有限公司 | Voltage stabilizer and control method thereof |
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Application publication date: 20150429 |