CN203674692U - Boost converter and controller for boost converter - Google Patents
Boost converter and controller for boost converter Download PDFInfo
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- CN203674692U CN203674692U CN201420014903.0U CN201420014903U CN203674692U CN 203674692 U CN203674692 U CN 203674692U CN 201420014903 U CN201420014903 U CN 201420014903U CN 203674692 U CN203674692 U CN 203674692U
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Abstract
A boost converter and a controller for a boost converter are disclosed. The boost converter comprises a short-circuit protection switch and a switching tube. When the boost converter is started, the switch tube is conducted, and control voltage is provided to the short-circuit protection switch to gradually conduct the short-circuit protection switch; judging whether the current flowing through the switching tube is larger than a preset value or not; if the current is larger than the preset value, the switching tube is disconnected, and timing is started at the same time; after timing for a preset time, detecting whether the boost converter has an output short circuit; and if the output short circuit of the boost converter occurs, the short-circuit protection switch is disconnected, so that protection is provided for the boost converter.
Description
Technical field
The utility model relates to electronic circuit, relates in particular to booster converter and controller thereof.
Background technology
In booster converter, if there is output short-circuit, may damage device.Therefore, should be booster converter short-circuit protection is provided.
Existing a kind of short-circuit protection method is to couple a protective switch of the short circuit between the switching circuit of booster converter and input voltage.In the time detecting that output short-circuit appears in booster converter, disconnect protective switch of the short circuit, thereby realize short-circuit protection.
For cost-saving and/or raising circuit characteristic, the in the prior art external protective switch of the short circuit of normal employing.For external protective switch of the short circuit, its on state threshold voltage is normally unknown.Therefore,, in the time of the control chip of design booster converter, provide to the voltage of external protective switch of the short circuit control end and should leave enough allowances by control chip, so that control chip can be opened most of external protective switch of the short circuit.
In the prior art, for above-mentioned short-circuit protection method, after the booster converter of being everlasting starts, a default fixed time goes to detect and judges whether booster converter occurs output short-circuit.But because the on state threshold voltage of external protective switch of the short circuit is unfixing, thereby there is problem inaccurate, not in time in this short-circuit protection method.Fig. 1 utilizes time shaft that the operation principle of existing short-circuit protection method is shown.As shown in Figure 1, t1 represents booster converter Startup time, and t2 represents the moment of external protective switch of the short circuit conducting, and t3 represents that short-circuit detecting judges the moment; T1 is the time between the t1 moment to t2 moment, and T2 is the time between the t2 moment to t3 moment, and T3 is the time between the t1 moment to t3 moment.As previously mentioned, the t3 moment is a default fixed time after booster converter starts, thereby the T3 period is fixed value.And the on state threshold voltage of t2 moment and external protective switch of the short circuit is relevant.If the on state threshold voltage of external protective switch of the short circuit is larger, the T1 period longer, the T2 period shorter, the output capacitor in switching circuit may also not fill enough electricity, short circuit judges inaccurate; If the on state threshold voltage of external protective switch of the short circuit is less, the T1 period shorter, the T2 period longer, output short-circuit may occur for a long time, device damages, short circuit judges not in time.
Utility model content
For problems of the prior art, the purpose of this utility model is to provide booster converter and the controller thereof with short-circuit protection function.
According to a kind of controller for booster converter of the utility model embodiment, this booster converter comprises protective switch of the short circuit and switching circuit, protective switch of the short circuit has first end, the second end and control end, its first end receives input voltage, switching circuit comprises inductor, switching tube, continued flow component and output capacitor, inductor has first end and the second end, and its first end is coupled to the second end of protective switch of the short circuit; Switching tube has first end, the second end and control end, and its first end is coupled to the second end of inductor, and its second end is coupled to reference to ground; Continued flow component has first end and the second end, and its first end is coupled to the second end of inductor; Output capacitor has first end and the second end, its first end is coupled to the second end of continued flow component and output voltage is provided, its second end is connected to reference to ground, controller comprises short-circuit protection control device, comprise current detection circuit, whether the electric current that judges the switching tube of flowing through reaches preset value, according to judged result generation current detection signal; Timing circuit, is coupled to current detection circuit with received current detection signal, and produces timing signal according to current detection signal; Short-circuit detecting circuit, is coupled to timing circuit to receive timing signal, detects whether short circuit of booster converter, and produce short-circuit detection signal according to testing result according to timing signal; And control voltage generation circuit, be coupled to current detection circuit with received current detection signal, and be coupled to short-circuit detecting circuit to receive short-circuit detection signal, controlling voltage generation circuit provides to the size of the control voltage of protective switch of the short circuit control end according to current detection signal and short-circuit detection signal control; And ON-OFF control circuit, be coupled to current detection circuit with received current detection signal, and be coupled to switching circuit to receive the feedback signal that represents output voltage, ON-OFF control circuit produces conducting and the shutoff of switch controlling signal with control switch pipe according to current detection signal and feedback signal.
According to some embodiment, booster converter also comprises current sense resistor, has first end and the second end, and described first end is coupled to the second end of switching tube and detection voltage is provided, and described the second end is connected to reference to ground; And current detection circuit comprises current sense comparator, there is first input end, the second input and output, the first end that described first input end is coupled to current sense resistor detects voltage to receive, described the second input receives the first reference voltage, current sense comparator relatively detects voltage and the first reference voltage, and according to comparative result at described output generation current detection signal.
According to some embodiment, short-circuit detecting circuit comprises short-circuit detecting comparator, there is first input end, the second input, output and Enable Pin, described first input end is coupled to switching circuit with receiving feedback signals, described the second input receives the second reference voltage, Enable Pin is coupled to timing circuit to receive timing signal, and short-circuit detecting comparator compares feedback signal and the second reference voltage according to timing signal, and produces short-circuit detection signal according to comparative result at described output.
According to some embodiment, control voltage generation circuit and comprise: capacitor, there is first end and the second end, described first end receives input voltage, and described the second end is coupled to the control end of protective switch of the short circuit; The first switch, has first end, the second end and control end, and described first end is coupled to the first end of capacitor, and described the second end is coupled to the second end of capacitor, and described control end is coupled to short-circuit detecting circuit to receive short-circuit detection signal; Current source, has first end and the second end, and described first end is coupled to the second end of capacitor; And second switch, thering is first end, the second end and control end, described first end is coupled to the second end of current source, and described the second end is connected to reference to ground, and described control end is coupled to current detection circuit with received current detection signal.
According to some embodiment, control voltage generation circuit and also comprise the 3rd switch, have first end, the second end and control end, described first end is coupled to the second end of capacitor, described the second end is connected to reference to ground, and described control end is subject to the control of timing signal and short-circuit detection signal.
According to some embodiment, booster converter also comprises current sense resistor, has first end and the second end, and described first end is coupled to switching tube and detection voltage is provided, and described the second end is connected to reference to ground; And ON-OFF control circuit comprises: current error amplifier, there is first input end, the second input and output, the first end that described first input end is coupled to current sense resistor detects voltage to receive, described the second input is connected to reference to ground, current error amplifier amplification detection voltage, and at described output generation current error amplification signal; Voltage error amplifier, there is first input end, the second input and output, described first input end receives the 3rd reference voltage, described the second input receiving feedback signals, voltage error amplifier amplifies the difference between the 3rd reference voltage and feedback signal, and produces voltage error amplifying signal at described output; Pulse width modulated comparator, there is first input end, the second input and output, described first input end is coupled to the output of voltage error amplifier with receiver voltage error amplification signal, described the second input is coupled to the output of current error amplifier with received current error amplification signal, pulse width modulated comparator is current error amplifying signal and voltage error amplifying signal relatively, and produces pulse-width modulation comparison signal at described output; And first circuits for triggering, there is set end, reset terminal and output, described set end receive clock signal, described reset terminal is coupled to the output of pulse width modulated comparator to receive pulse-width modulation comparison signal, and described output is coupled to the control end of switching tube and conducting and the shutoff of the first triggering signal with control switch pipe is provided.
According to some embodiment, control voltage generation circuit and also comprise AND circuit, there is first input end, the second input and output, described first input end is coupled to timing circuit to receive timing signal, described the second input is coupled to short-circuit detecting circuit to receive and the anti-phase signal of short-circuit detection signal, and described output produces with gate signal to provide to the control end of the 3rd switch, wherein, the first circuits for triggering also have Enable Pin, and described Enable Pin receives and gate signal; And ON-OFF control circuit also comprises the second circuits for triggering, there is set end, reset terminal and output, described set termination is received circuit start signal, and the output that described reset terminal is coupled to current sense comparator detects comparison signal with received current, and described output provides the second triggering signal; And OR circuit, there is first input end, the second input and output, described first input end is coupled to the output of the first circuits for triggering to receive the first triggering signal, described the second input is coupled to the output of the second circuits for triggering to receive the second triggering signal, and described output produces switch controlling signal so that the control end to switching tube to be provided.
According to a kind of booster converter of the utility model embodiment, this booster converter comprises protective switch of the short circuit, has first end, the second end and control end, and its first end receives input voltage; Switching circuit, comprises inductor, switching tube, continued flow component and output capacitor, and inductor has first end and the second end, and its first end is coupled to the second end of protective switch of the short circuit; Switching tube has first end, the second end and control end, and its first end is coupled to the second end of inductor, and its second end is coupled to reference to ground; Continued flow component has first end and the second end, and its first end is coupled to the second end of inductor; Output capacitor has first end and the second end, and its first end is coupled to the second end of continued flow component and output voltage is provided, and its second end is connected to reference to ground; And controller, this controller comprises short-circuit protection control device, comprises current detection circuit, judges whether the electric current of the switching tube of flowing through reaches preset value, according to judged result generation current detection signal; Timing circuit, is coupled to current detection circuit with received current detection signal, and produces timing signal according to current detection signal; Short-circuit detecting circuit, is coupled to timing circuit to receive timing signal, detects whether short circuit of booster converter, and produce short-circuit detection signal according to testing result according to timing signal; And control voltage generation circuit, be coupled to current detection circuit with received current detection signal, and be coupled to short-circuit detecting circuit to receive short-circuit detection signal, controlling voltage generation circuit provides to the size of the control voltage of protective switch of the short circuit control end according to current detection signal and short-circuit detection signal control; And ON-OFF control circuit, be coupled to current detection circuit with received current detection signal, and be coupled to switching circuit to receive the feedback signal that represents output voltage, ON-OFF control circuit produces conducting and the shutoff of switch controlling signal with control switch pipe according to current detection signal and feedback signal.
According to some embodiment, protective switch of the short circuit comprises P-type mos field-effect transistor.
In embodiment of the present utility model, short-circuit protection circuit can detect in time, exactly booster converter and whether occur short circuit.
Accompanying drawing explanation
Fig. 1 utilizes time shaft that the operation principle of existing short-circuit protection method is shown.
Fig. 2 illustrates the booster converter 100 according to an embodiment of the utility model.
Fig. 3 utilizes time shaft that the operation principle of short-circuit protection circuit shown in Fig. 2 is shown.
Fig. 4 illustrates the booster converter 200 according to an embodiment of the utility model.
Fig. 5 illustrates the operating process 300 for booster converter according to an embodiment of the utility model.
Embodiment
To describe specific embodiment of the utility model below in detail, it should be noted that the embodiments described herein, only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.But, it is evident that for those of ordinary skills: needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised at least one embodiment of the utility model.Therefore, differ and establish a capital the same embodiment of finger or example in each local phrase " in one embodiment ", " in an embodiment ", " example " or " example " occurring of whole specification.In addition, can with any suitable combination and or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that the accompanying drawing providing at this is all for illustrative purposes, and accompanying drawing not necessarily in proportion draw.Should be appreciated that it can be directly connected or coupled to another element or can have intermediary element in the time claiming " element " " to be connected to " or " coupling " arrives another element.On the contrary, when claiming element " to be directly connected to " or when " being directly coupled to " another element, not having intermediary element.Identical Reference numeral is indicated identical element.Term "and/or" used herein comprises any and all combinations of one or more relevant projects of listing.
Fig. 2 illustrates the booster converter 100 according to an embodiment of the utility model.As shown in Figure 2, booster converter 100 comprises switching circuit 110, controller 120 and protective switch of the short circuit MSCP.
Switching circuit 110 adopts asynchronous boosting inverter topology, comprises inductor L, output capacitor C, switching tube M and diode D.Wherein, inductor L has first end and the second end; Diode D has anode and negative electrode, and its anode is coupled to the second end of inductor L; Output capacitor C has first end and the second end, and its first end is coupled to the negative electrode of diode D, and its second end is connected to reference to ground; Switching tube M has first end, the second end and control end, and its first end is coupled to the second end of inductor L, and its second end is coupled to reference to ground.Switching circuit 210, by conducting and the shutoff of control switch pipe M, is converted to output voltage VO UT by input voltage VIN.The voltage at output capacitor C two ends is output voltage VO UT.In one embodiment, the diode D in switching circuit 110 can be replaced by other continued flow component, and as replaced by transistor, booster converter 100 adopts synchronous transformation topology.In one embodiment, the integrated control chip that is made as of controller 120, diode D can be external in outside control chip, and switching tube M can be integrated in control chip.In yet another embodiment, the switching tube in switching circuit 110 can be any controllable semiconductor switch device, such as mos field effect transistor (MOSFET), igbt (IGBT) etc.
Controller 120 comprises ON-OFF control circuit 121 and short-circuit protection control device 122.Protective switch of the short circuit MSCP forms short-circuit protection circuit together with short-circuit protection control device 122.Protective switch of the short circuit MSCP has first end, the second end and control end.Wherein, first end receives input voltage VIN, and the first end that the second end is coupled to inductor L is to provide input voltage VIN to switching circuit 110 when the protective switch of the short circuit MSCP conducting.In one embodiment, protective switch of the short circuit MSCP can be any controllable semiconductor switch device, such as mos field effect transistor (MOSFET), igbt (IGBT) etc.In another embodiment, protective switch of the short circuit MSCP can be P type pipe or N-type pipe.In another embodiment, within protective switch of the short circuit MSCP can be integrated in controller 120 place chips or be external in outside controller 120 place chips.
Short-circuit protection control device 122 comprises current detection circuit 1221, timing circuit 1222, short-circuit detecting circuit 1223 and controls voltage generation circuit 1224.Current detection circuit 1221 judges whether the electric current I L of the switching tube of flowing through reaches preset value ILref, and current detection circuit 1221 is according to judged result generation current detection signal SCMP1.Timing circuit 1222 is coupled to current detection circuit 1221 with received current detection signal SCMP1, and produces timing signal STIM according to current detection signal SCMP1.Short-circuit detecting circuit 1223 is coupled to timing circuit 1222 to receive timing signal STIM, and whether occurs short circuit according to timing signal STIM detection booster converter 100, thereby produces short-circuit detection signal SCP.Control voltage generation circuit 1224 and be coupled to current detection circuit 1221 with received current detection signal SCMP1, and control and provide to the size of the control voltage VC of protective switch of the short circuit MSCP control end according to current detection signal SCMP1.Control voltage generation circuit 1224 and be also coupled to short-circuit detecting circuit 1223 to receive short-circuit detection signal SCP; and control the control voltage VC of protective switch of the short circuit MSCP control end according to short-circuit detection signal SCP, to control conducting and the shutoff of protective switch of the short circuit MSCP.
ON-OFF control circuit 121 is coupled to switching circuit 110 to receive the feedback signal FB that represents output voltage VO UT, and be coupled to current detection circuit 1221 with received current detection signal SCMP1, and produce conducting and the shutoff of switch controlling signal CTRL with control switch pipe M according to feedback signal FB and current detection signal SCMP1.ON-OFF control circuit 121 can adopt pulse width modulation or pulse frequency modulated mode.In another embodiment, ON-OFF control circuit 121 can adopt the control method such as Controlled in Current Mode and Based or voltage mode control.
In the time that booster converter 100 starts, ON-OFF control circuit 121 provides switch controlling signal CTRL to make switching tube M conducting.Meanwhile, control voltage generation circuit 1224 control end of control voltage VC to protective switch of the short circuit MSCP is provided.Wherein, the absolute value of this control voltage VC increases gradually.Therefore,, in the time that booster converter 100 has just started, because the absolute value of control voltage VC is less, not conducting of protective switch of the short circuit MSCP, does not almost have electric current to flow through switching tube M.Along with the absolute value of controlling voltage VC increases gradually, in the time that it reaches the on state threshold voltage of protective switch of the short circuit MSCP, protective switch of the short circuit MSCP conducting, in switching tube M, current flowing IL and electric current I L increase gradually.In the time that electric current I L increases to preset value ILref, control voltage generation circuit 1224 and make the absolute value of controlling voltage VC stop increasing according to current detection signal SCMP1, keep constant.ON-OFF control circuit 121 according to current detection signal SCMP1 output switch control signal CTRL so that switching tube M turn-off.Meanwhile, timing circuit 1222 starts timing according to current detection signal SCMP1.After default timing time, timing signal STIM enables short-circuit detecting circuit 1223, and short-circuit detecting circuit 1223 starts to detect booster converter 100 and whether occurs short circuit.If short circuit appears in booster converter 100, control voltage generation circuit 1224 and turn-off protective switch of the short circuit MSCP according to short-circuit detection signal SCP.If there is not short circuit in booster converter 100, to control voltage generation circuit 1224 and make the complete conducting of protective switch of the short circuit MSCP according to short-circuit detection signal SCP, booster converter 100 is normally worked.
Fig. 3 utilizes time shaft that the operation principle of short-circuit protection circuit shown in Fig. 2 is shown.As shown in Figure 3, t1 ' represents booster converter Startup time, and t2 ' represents that electric current I L increases to the moment of preset value ILref, and t3 ' represents that short-circuit detecting judges the moment; T1 ' is the time between the t1 ' moment to t2 ' moment, and T2 ' is the time between the t2 ' moment to t3 ' moment, and T3 ' is the time between the t1 ' moment to t3 ' moment.As previously mentioned, the T2 ' period is that moment t2 ' rises, and by the predefined fixed value of timing circuit 1222.Although it is relevant with the on state threshold voltage of protective switch of the short circuit MSCP size that electric current I L increases to the moment t2 ' of preset value ILref, but the on state threshold voltage of the duration of period T2 ' and protective switch of the short circuit MSCP size is irrelevant.Therefore, can detect in time, exactly booster converter 100 according to the short-circuit protection circuit of the utility model proposition embodiment illustrated in fig. 2 and whether occur short circuit.
Fig. 4 illustrates the booster converter 200 according to an embodiment of the utility model.As shown in Figure 4, booster converter 200 comprises protective switch of the short circuit MSCP, switching circuit 210, current sense resistor RS, controller 220 and feedback circuit 230.
Shown in the structure of switching circuit 210 and Fig. 2, the structure of switching circuit 110 is similar, its same structure is not repeated herein, and only its difference is described.As shown in Figure 4, in switching circuit 210, the second end of switching tube M is coupled to one end of current sense resistor RS, and this end of current sense resistor RS provides and detect voltage VRS, and the other end of current sense resistor RS is connected to reference to ground.In another embodiment, current sensing resistor RS can be replaced by the conducting resistance of switching tube M.In this embodiment, the second end of switching tube M is connected to reference to ground, and the in-phase input end of current error amplifier AMP1 is coupled to the first end of switching tube M, and its inverting input is connected to reference to ground.
Feedback circuit 230 is coupled to output capacitor C to receive output voltage VO UT, and produces feedback signal VFB according to output voltage VO UT.In one embodiment, feedback circuit 230 comprises the resitstance voltage divider being composed in series by resistor R1 and R2.
Controller 220 comprises ON-OFF control circuit 221 and short-circuit protection control device 222.In the embodiment shown in fig. 4, ON-OFF control circuit 221 adopts peak-current mode control.As shown in Figure 4, ON-OFF control circuit 221 comprises current error amplifier AMP1, voltage error amplifier AMP2, pulse width modulated comparator CMP3 and the first circuits for triggering TR1.Current error amplifier AMP1 has in-phase input end, inverting input and output, its in-phase input end is coupled to the first end of current sensing resistor RS, its inverting input be connected to reference to ground, current error amplifier AMP1 amplified current detect resistor RS two ends detection voltage VRS and at its output generation current error amplification signal SAMP1.
Voltage error amplifier AMP2 has in-phase input end, inverting input and output, and its in-phase input end receives reference voltage VREF3, and its inverting input is coupled to feedback circuit 230 with receiving feedback signals VFB.Voltage error amplifier AMP2 amplifies the difference between reference voltage VREF3 and feedback signal VFB and produces voltage error amplifying signal SAMP2 at its output.In the embodiment shown in fig. 4, voltage error amplifying signal SAMP2 provides to pulse width modulated comparator CMP3 after the compensating circuit compensation being made up of resistor RC and capacitor CC.In another embodiment, voltage error amplifying signal SAMP2 can, without compensation, directly provide to pulse width modulated comparator CMP3.Pulse width modulated comparator CMP3 has in-phase input end, inverting input and output, its in-phase input end is coupled to the output of current error amplifier AMP1 with received current error amplification signal SAMP1, its inverting input is coupled to the output of voltage error amplifier AMP2 with receiver voltage error amplification signal SAMP2, and pulse width modulated comparator CMP3 is by current error amplifying signal SAMP1 and voltage error amplifying signal SAMP2 compares and produce pulse-width modulation comparison signal SCMP3 at its output.The first circuits for triggering TR1 has set end S, reset terminal R, output Q and Enable Pin EN, its set end S receive clock signal OSC, its reset terminal R is coupled to the output of pulse width modulated comparator CMP3 to receive pulse-width modulation comparison signal SCMP3, and the first circuits for triggering TR1 produces the first triggering signal STR1 according to the signal of clock signal OSC, pulse-width modulation comparison signal SCMP3 and Enable Pin EN reception at its output Q.The output of the first circuits for triggering TR1 is coupled to the control end of switching tube M, so that conducting and the shutoff of the first triggering signal STR1 control switch pipe M.
Protective switch of the short circuit MSCP forms short-circuit protection circuit together with short-circuit protection control device 222.Protective switch of the short circuit MSCP adopts P type MOSFET, has first end, the second end and control end, and its first end receives input voltage VIN, and its second end is coupled to the first end of inductor L.Short-circuit protection control device 222 comprises current detection circuit, timing circuit TIM, short-circuit detecting circuit and control voltage generation circuit 2221.Current detection circuit comprises current sense comparator CMP1.Current sense comparator CMP1 has in-phase input end, inverting input and output, the first end that its in-phase input end is coupled to current sensing resistor RS detects voltage VRS to receive, its inverting input receives reference voltage VREF1, and current sense comparator CMP1 is by detection voltage VRS and reference voltage VREF1 compares and at its output generation current detection signal SCMP1.Timing circuit TIM is coupled to the output of current sense comparator CMP1 with received current detection signal SCMP1, and produces timing signal STIM according to current detection signal SCMP1.Short-circuit detecting circuit comprises short-circuit detecting comparator C MP2.Short-circuit detecting comparator C MP2 has in-phase input end, inverting input, Enable Pin and output, its in-phase input end receives reference signal VREF2, its inverting input is coupled to feedback circuit 230 with receiving feedback signals VFB, its Enable Pin is coupled to timing circuit TIM to receive timing signal STIM, short-circuit detecting comparator C MP2 in the time enabling with reference to signal VREF2 with feedback signal VFB compares and produce short-circuit detection signal SCP at its output.
Control voltage generation circuit 2221 and comprise capacitor CC, current source IS, the first switch S 1 and second switch S2.Wherein, capacitor CC has first end and the second end, and its first end receives input voltage VIN, and the control end that its second end is coupled to protective switch of the short circuit MSCP is thought protective switch of the short circuit MSCP providing end voltage VC.The first switch S 1 has first end, the second end and control end, its first end is coupled to the first end of capacitor CC, its second end is coupled to the second end of capacitor CC, and its control end is coupled to the output of short-circuit detecting comparator C MP2 to receive short-circuit detection signal SCP.Current source IS has first end and the second end, and its first end is coupled to the second end of the first switch S 1.Current source IS has the electric current that flows to the second end from its first end.Second switch S2 has first end, the second end and control end, and its first end is coupled to the second end of current source IS, and its second end is connected to reference to ground, and its control end is coupled to the output of current sense comparator CMP1 with received current detection signal SCMP1.In the embodiment shown in fig. 4, control voltage generation circuit 2221 and also comprise the 3rd switch S 3.The 3rd switch S 3 has first end, the second end and control end, and its first end is coupled to the second end of capacitor CC, and its second end is connected to reference to ground.
In the embodiment shown in fig. 4, ON-OFF control circuit 221 also comprises the second circuits for triggering TR2 and OR circuit OR, controls voltage generation circuit 2221 and also comprises AND circuit AND.The second circuits for triggering TR2 has set end S, reset terminal R and output Q, its set end S receiving circuit enabling signal STRT, its reset terminal R is coupled to the output of current sense comparator CMP1 with received current detection signal SCMP1, and the second circuits for triggering TR2 produces the second triggering signal STR2 according to circuit start signal STRT and current detection signal SCMP1 at its output Q.OR circuit OR has first input end, the second input and output, its first input end is coupled to the first circuits for triggering TR1 to receive the first triggering signal STR1, its second input is coupled to the second circuits for triggering TR2 to receive the second triggering signal STR2, and OR circuit OR produces switch controlling signal CTRL so that conducting and the shutoff of removing control switch pipe M to the control end of switching tube M to be provided according to the first triggering signal STR1 and the second triggering signal STR2 at its output.AND circuit AND has first input end, the second input and output, its first input end is coupled to the output of timing circuit TIM to receive timing signal STIM, its second input is coupled to the output of short-circuit detecting comparator C MP2 to receive the inversion signal of short-circuit detection signal SCP, and AND circuit AND produces with gate signal SAND to provide to the control end of the 3rd switch S 3 and the Enable Pin EN of the first circuits for triggering TR1 at its output according to timing signal STIM and short-circuit detection signal SCP.In the embodiment shown in fig. 4, the first circuits for triggering TR1, the second circuits for triggering TR2, AND circuit AND and OR circuit OR are exemplary, in other embodiments, can be realized by the logical circuit of other form.
In the time that booster converter 200 starts, circuit start signal STRT provides the set end S to the second circuits for triggering TR2, thereby second circuits for triggering TR2 produce high level at its output the second triggering signal STR2 so that the second input to OR circuit OR to be provided, therefore the switch controlling signal CTRL of OR circuit OR output high level makes switching tube M conducting.Meanwhile, due to short-circuit detecting comparator C, MP2 does not enable, the short-circuit detection signal SCP of its output low level so that the first switch S 1 disconnect.In addition, be less than the first reference signal VREF1 owing to detecting voltage VRS, the current detection signal SCMP1 of current detecting comparison CMP1 output low level, to provide to the control end of second switch S2, makes second switch S2 conducting.And, due to timing circuit, TIM does not start timing, the timing signal STIM of timing circuit TIM output low level to be to provide to the first input end of AND circuit AND, thus the output output low level of AND circuit AND with gate signal SAND, the 3rd switch S 3 is disconnected.Therefore, the control voltage VC of the drop-down protective switch of the short circuit MSCP of current source IS, the absolute value of controlling voltage VC increases gradually.
Due in the time that booster converter 200 has just started, the absolute value of controlling voltage VC is less, and not conducting of protective switch of the short circuit MSCP, does not almost have electric current to flow through switching tube M.Along with the absolute value of controlling voltage VC increases gradually, in the time that it increases to the on state threshold voltage of protective switch of the short circuit MSCP, protective switch of the short circuit MSCP conducting, current flowing IL in switching tube M.Electric current I L increases gradually, thereby the detection voltage VRS at current sensing resistor RS two ends increases gradually.In the time that detection voltage VRS increases to reference voltage VREF1, the current detection signal SCMP1 of the output output high level of current sense comparator CMP1.The current detection signal SCMP1 of this high level disconnects second switch S2, thereby current source IS stops drop-down control voltage VC.In addition, the current detection signal SCMP1 of this high level second circuits for triggering TR2 that also resets, the second circuits for triggering TR2 produces low level the second triggering signal STR2 at its output.Because the first circuits for triggering TR1 does not now enable, its first triggering signal STR1 providing is also low level, and therefore the switch controlling signal CTRL of OR circuit OR output low level disconnects switching tube M.Now, switching circuit 210, by diode D afterflow, provides the output voltage VO UT increasing gradually on output capacitor C.Meanwhile, timing circuit TIM starts timing under the triggering of the current detection signal SCMP1 of high level.
After a Preset Time, the timing signal STIM of timing circuit TIM output high level.Timing signal STIM enables short-circuit detecting comparator C MP2, and short-circuit detecting comparator C MP2 starts comparison reference voltage VREF2 and feedback signal VFB.If short circuit does not appear in booster converter 200, feedback signal VFB is greater than reference voltage VREF2, and short-circuit detecting comparator C MP2 produces low level short-circuit detection signal SCP at output.Now, AND circuit AND output high level with gate signal SAND, this high level make the 3rd switch S 3 conductings with gate signal SAND, protective switch of the short circuit MSCP, by conducting completely, has reduced loss.In addition, this high level enable the first circuits for triggering TR1 with gate signal SAND.Therefore, booster converter 200 starts normal work.If short circuit appears in booster converter 200, feedback signal VFB is less than reference voltage VREF2, and short-circuit detecting comparator C MP2 produces the short-circuit detection signal SCP of high level at output.Short-circuit detection signal SCP conducting first switch S 1 of this high level, the control voltage VC of protective switch of the short circuit MSCP is zero, thus protective switch of the short circuit MSCP disconnects, to provide short-circuit protection to booster converter 200.
When booster converter 200 normal work, the first circuits for triggering TR1 is according to clock signal OSC and pulse-width modulation comparison signal SCMP3 alternate conduction and on-off switching tube M.When the rising edge of a pulse of clock signal OSC comes interim, the first triggering signal STR1 of the first circuits for triggering TR1 output high level, then the switch controlling signal CTRL of OR circuit OR output high level makes switching tube M conducting, is inductor L and output capacitor C charging.Now, the electric current that flows through inductor L increases gradually, in the time that its increase causes current error amplifying signal SAMP1 to be greater than voltage error amplifying signal SAMP2, and the pulse-width modulation comparison signal SCMP3 of pulse width modulated comparator CMP3 output high level.The pulse-width modulation comparison signal SCMP3 of this high level first circuits for triggering TR1 that resets, makes the first triggering signal STR1 of the first circuits for triggering TR1 output low level, and the switch controlling signal CTRL of OR circuit OR output low level turn-offs switching tube M then.Now, electric current is by diode D afterflow, until the rising edge of next clock signal OSC arrives.More than action constantly repeats, and makes booster converter 200 that input voltage VIN is converted to output voltage VO UT.
Fig. 5 illustrates the operating process 300 for booster converter according to an embodiment of the utility model.Booster converter comprises switching circuit and protective switch of the short circuit MSCP.Protective switch of the short circuit MSCP has first end, the second end and control end, and described first end is coupled to input voltage.Switching circuit comprises inductor, switching tube M, continued flow component and output capacitor, and inductor has first end and the second end, and described first end is coupled to the second end of protective switch of the short circuit MSCP; Switching tube M has first end, the second end and control end, and described first end is coupled to the second end of inductor, and described the second end is coupled to reference to ground; Continued flow component has first end and the second end, and described first end is coupled to the second end of inductor; Output capacitor has first end and the second end, and described first end is coupled to the second end of continued flow component, and described the second end is connected to reference to ground.As shown in Figure 5, short-circuit protection method 300 comprises step 301～308.In step 301, booster converter starts, and enters step 302.In step 302, switching tube M conducting; Meanwhile, provide and control voltage VC to the control end of protective switch of the short circuit MSCP, the absolute value of this control voltage VC increases gradually.In one embodiment, protective switch of the short circuit MSCP can be any controllable semiconductor switch device, such as mos field effect transistor (MOSFET), igbt (IGBT) etc.In another embodiment, protective switch of the short circuit MSCP can be P type pipe or N-type pipe.In the time that protective switch of the short circuit MSCP is P type pipe, controlling voltage VC is negative value; In the time that protective switch of the short circuit MSCP is N-type pipe, control voltage VC and be on the occasion of.
In step 303, detect and flow through the electric current I L of switching tube M, and judge whether electric current I L is greater than preset value ILref.If electric current I L is greater than preset value ILref, enter step 304, cut-off switch pipe M starts timing simultaneously.In another embodiment, step 304 also comprises and maintains that to control voltage VC constant.If electric current I L is less than preset value ILref, get back to step 302, continue actuating switch pipe M, and continue to increase the absolute value of controlling voltage VC.In step 305, one section of Preset Time of timing, short-circuit protection method 300 enters step 306, judges whether booster converter occurs output short-circuit.In one embodiment, judge whether booster converter occurs that the step of output short-circuit comprises the feedback signal that detects expression output voltage, and feedback signal and reference voltage are compared, if feedback signal is less than reference voltage, conclude booster converter output short-circuit; If feedback signal is greater than reference voltage, conclude that output short-circuit does not appear in booster converter.If there is not output short-circuit in booster converter, enter step 308, booster converter is normally worked.If there is short circuit in booster converter, enter step 307, disconnect protective switch of the short circuit MSCP.
Although described the utility model with reference to several exemplary embodiments, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not depart from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (9)
1. the controller for booster converter, it is characterized in that, booster converter comprises protective switch of the short circuit and switching circuit, protective switch of the short circuit has first end, the second end and control end, described first end receives input voltage, switching circuit comprises inductor, switching tube, continued flow component and output capacitor, and inductor has first end and the second end, and described first end is coupled to the second end of protective switch of the short circuit; Switching tube has first end, the second end and control end, and described first end is coupled to the second end of inductor, and described the second end is coupled to reference to ground; Continued flow component has first end and the second end, and described first end is coupled to the second end of inductor; Output capacitor has first end and the second end, and described first end is coupled to the second end of continued flow component and output voltage is provided, and described the second end is connected to reference to ground, and controller comprises:
Short-circuit protection control device, comprising:
Current detection circuit, judges whether the electric current of the switching tube of flowing through reaches preset value, according to judged result generation current detection signal;
Timing circuit, is coupled to current detection circuit with received current detection signal, and produces timing signal according to current detection signal;
Short-circuit detecting circuit, is coupled to timing circuit to receive timing signal, detects whether short circuit of booster converter, and produce short-circuit detection signal according to testing result according to timing signal; And
Control voltage generation circuit, be coupled to current detection circuit with received current detection signal, and be coupled to short-circuit detecting circuit to receive short-circuit detection signal, controlling voltage generation circuit provides to the size of the control voltage of protective switch of the short circuit control end according to current detection signal and short-circuit detection signal control; And
ON-OFF control circuit, be coupled to current detection circuit with received current detection signal, and be coupled to switching circuit to receive the feedback signal that represents output voltage, ON-OFF control circuit produces conducting and the shutoff of switch controlling signal with control switch pipe according to current detection signal and feedback signal.
2. controller as claimed in claim 1, is characterized in that:
Booster converter also comprises current sense resistor, has first end and the second end, and described first end is coupled to the second end of switching tube and detection voltage is provided, and described the second end is connected to reference to ground; And
Current detection circuit comprises current sense comparator, there is first input end, the second input and output, the first end that described first input end is coupled to current sense resistor detects voltage to receive, described the second input receives the first reference voltage, current sense comparator relatively detects voltage and the first reference voltage, and according to comparative result at described output generation current detection signal.
3. controller as claimed in claim 1, it is characterized in that, short-circuit detecting circuit comprises short-circuit detecting comparator, there is first input end, the second input, output and Enable Pin, described first input end is coupled to switching circuit with receiving feedback signals, described the second input receives the second reference voltage, Enable Pin is coupled to timing circuit to receive timing signal, short-circuit detecting comparator compares feedback signal and the second reference voltage according to timing signal, and produces short-circuit detection signal according to comparative result at described output.
4. controller as claimed in claim 1, is characterized in that, controls voltage generation circuit and comprises:
Capacitor, has first end and the second end, and described first end receives input voltage, and described the second end is coupled to the control end of protective switch of the short circuit;
The first switch, has first end, the second end and control end, and described first end is coupled to the first end of capacitor, and described the second end is coupled to the second end of capacitor, and described control end is coupled to short-circuit detecting circuit to receive short-circuit detection signal;
Current source, has first end and the second end, and described first end is coupled to the second end of capacitor; And
Second switch, has first end, the second end and control end, and described first end is coupled to the second end of current source, and described the second end is connected to reference to ground, and described control end is coupled to current detection circuit with received current detection signal.
5. controller as claimed in claim 4, it is characterized in that, control voltage generation circuit and also comprise the 3rd switch, there is first end, the second end and control end, described first end is coupled to the second end of capacitor, described the second end is connected to reference to ground, and described control end is subject to the control of timing signal and short-circuit detection signal.
6. controller as claimed in claim 1, is characterized in that:
Booster converter also comprises current sense resistor, has first end and the second end, and described first end is coupled to switching tube and detection voltage is provided, and described the second end is connected to reference to ground; And
ON-OFF control circuit comprises:
Current error amplifier, there is first input end, the second input and output, the first end that described first input end is coupled to current sense resistor detects voltage to receive, described the second input is connected to reference to ground, current error amplifier amplification detection voltage, and at described output generation current error amplification signal;
Voltage error amplifier, there is first input end, the second input and output, described first input end receives the 3rd reference voltage, described the second input receiving feedback signals, voltage error amplifier amplifies the difference between the 3rd reference voltage and feedback signal, and produces voltage error amplifying signal at described output;
Pulse width modulated comparator, there is first input end, the second input and output, described first input end is coupled to the output of voltage error amplifier with receiver voltage error amplification signal, described the second input is coupled to the output of current error amplifier with received current error amplification signal, pulse width modulated comparator is current error amplifying signal and voltage error amplifying signal relatively, and produces pulse-width modulation comparison signal at described output; And
The first circuits for triggering, there is set end, reset terminal and output, described set end receive clock signal, described reset terminal is coupled to the output of pulse width modulated comparator to receive pulse-width modulation comparison signal, and described output is coupled to the control end of switching tube and conducting and the shutoff of the first triggering signal with control switch pipe is provided.
7. controller as claimed in claim 6, is characterized in that:
Control voltage generation circuit and also comprise AND circuit, there is first input end, the second input and output, described first input end is coupled to timing circuit to receive timing signal, described the second input is coupled to short-circuit detecting circuit to receive and the anti-phase signal of short-circuit detection signal, described output produces with gate signal to provide to the control end of the 3rd switch, wherein, the first circuits for triggering also have Enable Pin, and described Enable Pin receives and gate signal; And
ON-OFF control circuit also comprises the second circuits for triggering, there is set end, reset terminal and output, described set termination is received circuit start signal, and the output that described reset terminal is coupled to current sense comparator detects comparison signal with received current, and described output provides the second triggering signal; And OR circuit, there is first input end, the second input and output, described first input end is coupled to the output of the first circuits for triggering to receive the first triggering signal, described the second input is coupled to the output of the second circuits for triggering to receive the second triggering signal, and described output produces switch controlling signal so that the control end to switching tube to be provided.
8. a booster converter, is characterized in that, comprising:
Protective switch of the short circuit, has first end, the second end and control end, and described first end receives input voltage;
Switching circuit, comprises inductor, switching tube, continued flow component and output capacitor, and inductor has first end and the second end, and described first end is coupled to the second end of protective switch of the short circuit; Switching tube has first end, the second end and control end, and described first end is coupled to the second end of inductor, and described the second end is coupled to reference to ground; Continued flow component has first end and the second end, and described first end is coupled to the second end of inductor; Output capacitor has first end and the second end, and described first end is coupled to the second end of continued flow component and output voltage is provided, and described the second end is connected to reference to ground; And
According to the controller described in arbitrary claim in claim 1 to 7.
9. booster converter as claimed in claim 8, is characterized in that, protective switch of the short circuit comprises P-type mos field-effect transistor.
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|---|---|---|---|
| CN201420014903.0U CN203674692U (en) | 2014-01-10 | 2014-01-10 | Boost converter and controller for boost converter |
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| CN201420014903.0U CN203674692U (en) | 2014-01-10 | 2014-01-10 | Boost converter and controller for boost converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746342A (en) * | 2014-01-10 | 2014-04-23 | 成都芯源***有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746342A (en) * | 2014-01-10 | 2014-04-23 | 成都芯源***有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
| CN103746342B (en) * | 2014-01-10 | 2016-09-21 | 成都芯源***有限公司 | Boost converter, controller for boost converter and short-circuit protection method |
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