CN103607117A - DC-DC converter - Google Patents
DC-DC converter Download PDFInfo
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- CN103607117A CN103607117A CN201310593687.XA CN201310593687A CN103607117A CN 103607117 A CN103607117 A CN 103607117A CN 201310593687 A CN201310593687 A CN 201310593687A CN 103607117 A CN103607117 A CN 103607117A
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Abstract
The invention relates to a DC-DC converter. The DC-DC converter comprises a first switch, a second switch, a second capacitor, and a negative feedback control circuit with energy recovery. When an energized end receives a non-energized signal, and the negative feedback control circuit detects that an output voltage is greater than a threshold voltage, the second switch is switched on, and the second capacitor discharges an inductor; when the output voltage is smaller than the threshold voltage, the second switch is switched off, the firs switch is switched on under the control of the first output end of the negative feedback control circuit, the inductor discharges, and a battery is charged at the same time; and when the negative feedback control circuit detects that an inductor current is smaller than a threshold current, the first switch is switched off through the first output end of the negative feedback control circuit, and the DC-DC converter stops working. By using the DC-DC converter, energy in a capacitor can be recovered, and the energy use efficiency can be improved.
Description
Technical field
The present invention relates to electronic circuit technology field, relate in particular to a kind of DC-to-DC converter.
Background technology
Fig. 1 is the DC-to-DC converter that the present invention is traditional.In Fig. 1, traditional DC-to-DC converter is generally one-way transmission energy, always from input power to output loading transmitting energy.In order to save energy, a lot of systems all adopt service intermittent mode, be that DC-to-DC converter in Fig. 1 is enabled and close (system service intermittent and dormancy) by batch (-type), when Enable Pin EN receives enable signal, negative feedback control circuit work, input voltage VIN (for example 5V) is converted to output voltage VO (for example 3V), for being powered circuit, provides operating voltage.When Enable Pin EN receives disable signal, negative feedback control circuit quits work, output voltage VO is by resistance R 2 and R1 or be powered circuit discharging to zero negative, in the design also having, by the switch being additionally connected between VO node and ground node, the electric charge of output capacitance C2 is bled off.When each EN signal becomes enable signal again, output capacitance C2 is charged again; When each EN signal becomes low level, output level C2 is discharged completely.When C2 is by charging and discharging repeatedly like this, energy is slatterned completely.
Summary of the invention
The object of the invention is by traditional DC-to-DC converter after closing, the energy of one-way transmission is reclaimed.
For achieving the above object, the invention provides a kind of DC-to-DC converter.This transducer comprises: battery, the negative feedback control circuit, the first switch, second switch, inductance, the second electric capacity that with energy, reclaim;
Described the first switch S 1 is connected between supply voltage and the first end of described inductance L 1, and the control end of described the first switch S 1 is connected in negative feedback control circuit the first output HDV reclaiming with energy;
Described second switch S2 is connected in first end and the earth terminal of inductance L 1, and the control end of described second switch S2 is connected in described negative feedback control circuit the second output LDV reclaiming with energy;
The second electric capacity is connected between second end and ground end of inductance L 1, to output voltage is provided;
The described negative feedback control circuit reclaiming with energy, first input end is connected to supply voltage VIN, and the second input is connected to Enable Pin EN, when Enable Pin EN receives disable signal, when negative feedback control circuit detects output voltage VO and is greater than threshold V T D, the second output LDV conducting second switch S2 of the negative feedback control circuit reclaiming with energy, described the second capacitor C 2 is inductance L 1 electric discharge, when output voltage VO is less than threshold V T D, turn-off described second switch S2, the conducting under the control of the first output HDV of negative feedback control circuit of the first switch S 1, inductance L 1 electric discharge, battery is charged simultaneously, when negative feedback control circuit detects inductance L 1 electric current and is less than threshold current, the first output HDV by negative feedback control circuit turn-offs the first switch S 1, described DC-to-DC converter quits work.
Preferably, when Enable Pin EN receives enable signal, the described negative feedback control circuit reclaiming with energy is controlled conducting or the shutoff of the first switch S 1 and second switch S2 according to feedback voltage.
Preferably, described DC-to-DC converter comprises bleeder circuit, and output voltage VO is detected; Output voltage VO is connected to the 3rd input FB of the described negative feedback control circuit reclaiming with energy by bleeder circuit, the described negative feedback control circuit reclaiming with energy compares output voltage VO and threshold V T D thus.
Preferably, described DC-to-DC converter also comprises: be powered circuit, and described the second capacitor C 2 parallel connections, when Enable Pin EN receives enable signal, described line voltage VIN provides operating voltage for the described circuit that is powered.
Preferably, the four-input terminal LX of the described negative feedback control circuit reclaiming with energy is connected to inductance L 1 first end.
Preferably, the described negative feedback control circuit reclaiming with energy comprises error amplifier, PWM comparator PWMC and logic control; The first reference voltage REF is connected to an input of error amplifier EA, output voltage VO is connected to the another input of error amplifier EA, the output of error amplifier EA is connected to the normal phase input end of PWM comparator PWMC, pulse voltage RAMP is connected to the inverting input of PWM comparator PWMC, the output of PWM comparator PWMC is connected to the input of described logic control, through described logic control, produces HDP signal and LDP signal; When Enable Pin EN receives enable signal, the described negative feedback control circuit reclaiming with energy allows described HDP signal and LDP signal to control respectively the first output HDV and the second output LDV of negative feedback control circuit.
Preferably, the described negative feedback control circuit reclaiming with energy comprises the first comparator C omp1, and output voltage VO and threshold V T D are compared; When Enable Pin EN receives disable signal, if output voltage VO is greater than threshold V T D, the output signal AH of the first comparator C omp1 controls the second output LDV of the negative feedback control circuit reclaiming with energy, makes second switch S2 conducting;
When Enable Pin EN receives disable signal, if output voltage VO is less than threshold V T D, the output signal AH of the first comparator C omp1 controls the second output LDV of the negative feedback control circuit reclaiming with energy, and second switch S2 is turn-offed.
Preferably, the negative feedback control circuit reclaiming with energy also comprises the second d type flip flop ffdf2, and the second d type flip flop ffdf2 resets according to the output signal AH of the first comparator C omp1; When Enable Pin EN receives disable signal, if output voltage VO is less than threshold V T D, the output signal HHA of the second d type flip flop ffdf2 controls the first output HDV of the negative feedback control circuit reclaiming with energy, makes the first switch S 1 conducting.
Preferably, the negative feedback control circuit reclaiming with energy also comprises the first d type flip flop ffdf1 and the second comparator C omp2, the first d type flip flop ffdf1 resets according to the output signal AH of the first comparator C omp1, and the second comparator C omp2 compares inductance L 1 electric current and threshold current; When Enable Pin EN receives disable signal, if inductance L 1 electric current is less than threshold current, the output signal HHE of the output signal IR of the second comparator C omp2 and the first d type flip flop ffdf1 controls the first input end HDV of the negative feedback control circuit reclaiming with energy, and the first switch S 1 is turn-offed.
Preferably, the negative feedback control circuit reclaiming with energy comprises: first with a door AND1, second with door AND2, the 3rd with a door AND3, the 4th with door AND4, a first d type flip flop ffdf1, first or door OR1, second or door OR2, the 3rd or OR3, inverter INV1, the first driver DRV1, the second driver DRV2;
Supply voltage VIN and the second reference voltage VOS are connected to the normal phase input end of described the second comparator C omp2, inductance L 1 voltage is connected to the inverting input of the second comparator C omp2, the second comparator C omp2 output be connected to the 3rd with door AND3 one end, the output of the first d type flip flop ffdf1 be connected to the 3rd with door AND3 another end, the 3rd with door AND3 output be connected to the 3rd or door OR3 one end, the Enable Pin EN of the first d type flip flop ffdf1 be connected to the 3rd or door OR3 another end, the 3rd or the output of door OR3 be connected to the reset terminal of the second d type flip flop ffdf2, the output of the second d type flip flop ffdf2 be connected to first or door OR1 one end,
The HDP signal of control logic be input to the 4th with door AND4 one end, Enable Pin EN be connected to the 4th with door AND4 another end, the described the 4th with door AND4 be connected to first or door OR1 another end, described first or door OR1 after the first driver DRV1, be connected to the first output HDV of the negative feedback control circuit reclaiming with energy;
Output voltage VO is connected to the normal phase input end of the first comparator C omp1, threshold V T D is connected to the inverting input of the first comparator C omp1, the output of described the first comparator C omp1 be connected to first with door AND1 one end, Enable Pin EN through inverter INV1 be connected to first with door AND1 another end; First with door AND1 output be connected to second or door OR2 one end;
The LDP signal of control logic be input to second with door AND2 one end, Enable Pin EN be connected to second with door AND2 another end, described second with door AND2 be connected to second or door OR2 another end, described second or door OR2 after the second driver DRV2, be connected to the second output LDV of the negative feedback control circuit reclaiming with energy.
The object of the invention is the energy on the second electric capacity and electric charge partially recycled, to save energy.For frequent starting and the DC-to-DC converter of closing, the energy being stored in after closing in output capacitance is reclaimed at every turn, contribute to raising efficiency.For being powered circuit, be capacitive load (load equivalent is capacitance characteristic), the effect that energy reclaims is better.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the DC-to-DC converter that the present invention is traditional;
Fig. 2 is the DC-to-DC converter of the negative feedback control circuit of embodiment of the present invention band energy recovery;
Fig. 3 is the negative feedback control circuit implementation reclaiming with energy in the embodiment of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
For example, for example, while being for input power the unit (super capacitor) that rechargeable battery (lithium battery or Ni-MH battery) or other can stored energys, the present invention can realize when DC-to-DC converter is closed the energy in the second capacitor C 2 is partially recycled, and input power is charged.The enable signal that the Enable Pin EN of take respectively below receives is high level, and disable signal is that low level is that example is done to illustrate.
Fig. 2 is the DC-to-DC converter of the negative feedback control circuit of embodiment of the present invention band energy recovery.In Fig. 2, DC-to-DC converter comprises: the second capacitor C 2 of battery, the negative feedback control circuit reclaiming with energy, the first switch S 1, second switch S2, inductance L 1 and inductance L 1 series connection.With the difference of traditional DC-to-DC converter be: adopt the negative feedback control circuit reclaiming with energy to substitute traditional negative feedback control circuit.
In the embodiment of the present invention, the first switch S 1 white silk is connected between supply voltage and the first end of inductance L 1, and the control end of the first switch S 1 is connected in negative feedback control circuit the first output HDV reclaiming with energy; Second switch S2 is connected in first end and the earth terminal of inductance L 1, and the control end of second switch S2 is connected in described negative feedback control circuit the second output LDV reclaiming with energy; The second electric capacity is connected between second end and ground end of inductance L 1, to output voltage is provided, and the negative feedback control circuit reclaiming with energy, first input end is connected to supply voltage VIN, and the second input is connected to Enable Pin EN.
Further, operation principle is as follows:
When EN is high level, the negative feedback control circuit reclaiming with energy is carried out has identical function with traditional DC-to-DC converter, first output HDV conducting the first switch S 1 of the negative feedback control circuit reclaiming with energy, by supply voltage VIN for the second capacitor C 2 charging and provide operating voltage for being powered circuit, by the feedback voltage of feedback loop, control the conducting of the first switch S 1, the shutoff of second switch S2 shutoff or the first switch S 1, the conducting of second switch S2, making DC-to-DC converter output voltage VO is constant voltage.
When Enable Pin EN becomes low level from high level, the voltage that negative feedback control circuit detects bleeder circuit is greater than threshold V T D, now, the second output LDV conducting second switch S2 of negative feedback control circuit, in this one-phase, energy in the second capacitor C 2 is transferred in inductance L 1, until being reduced to threshold V T D(, output voltage V 0 is generally higher than 0V, but when the voltage of a little higher than 0V) following, controlling second switch S2 turn-offs, the conducting under the control of the first output HDV signal of the negative feedback control circuit reclaiming with energy of the first switch S 1, inductance L 1 starts to release energy, battery BAT to input charges, until the energy of inductance L 1 is closed the first switch S 1 after fully being discharged.Now, it is negative feedback control circuit when inductance both end voltage being detected and being less than threshold current that inductance L 1 energy is fully discharged, and the energy of inductance is fully discharged (negative feedback control circuit reclaiming with energy detects the direction that inductive current soon flows to VIN from VO and changes into the direction that flows to VO from VIN).After this, DC-to-DC converter just quits work completely.
In prior art, general Enable Pin EN is from high level becomes low level, and DC-to-DC converter just quits work immediately.And in embodiments of the present invention, when Enable Pin EN is from high level becomes low level, DC-to-DC converter also will, according to above-mentioned operation principle work a period of time, to the energy on output capacitance C2 is reclaimed, and be charged to the battery of input.
In an optional embodiment, threshold current equals VOS/R
oNbusiness; VOS is the magnitude of voltage of voltage source V OS, is also the second reference voltage, R
oNit is the conducting resistance of the first switch S 1.
Alternatively, DC-to-DC converter comprises bleeder circuit, and output voltage VO is detected; Output voltage VO is connected to the 3rd input FB of the described negative feedback control circuit reclaiming with energy by bleeder circuit, the described negative feedback control circuit reclaiming with energy compares output voltage VO and threshold V T D thus.
Wherein, bleeder circuit comprises the first resistance R 1 and the second resistance R 2, and through bleeder circuit, the dividing potential drop of output voltage is:
FB=VO*(R2+R1)/R1
Alternatively, DC-to-DC converter also comprises: be powered circuit, and the second capacitor C 2 parallel connections, when Enable Pin EN is high electricity, line voltage VIN provides operating voltage for the described circuit that is powered.
The four-input terminal LX of the negative feedback control circuit reclaiming with energy alternatively, is connected to inductance L 1 first end.
Fig. 3 has described according to a kind of execution mode of the negative feedback control circuit reclaiming with energy in Fig. 2 of the present invention.In Fig. 3, the negative feedback control circuit reclaiming with energy comprises: the first comparator C omp1, the second comparator C omp2, first with door AND1, second with door AND2, the 3rd with a door AND3, the 4th with door AND4, a first d type flip flop ffdf1, the second d type flip flop ffdf2, first or door OR1, second or an OR2, the 3rd or OR3, the first driver DRV1, the second driver DRV2, inverter INV1, error amplifier EA, PWM comparator PWMC and logic control.
Particularly, supply voltage VIN and the second reference voltage VOS input to the normal phase input end (electric current of supply voltage VIN and the second reference voltage VOS end is threshold current) of described the second comparator C omp2, inductance L 1 voltage is connected to the inverting input of the second comparator C omp2, the second comparator C omp2 output be connected to the 3rd with door AND3 one end, the output of the first d type flip flop ffdf1 be connected to the 3rd with door AND3 another end, the 3rd with door output be connected to the 3rd or door OR3 one end, the Enable Pin EN of the first d type flip flop ffdf1 be connected to the 3rd or door OR3 another end, the 3rd or the output of door OR3 be connected to the reset terminal of the second d type flip flop ffdf2, the output of the second d type flip flop ffdf2 be connected to first or door OR1 one end, the first d type flip flop and the second d type flip flop d end all to access supply voltage VIN(high level effective),
The HDP signal of control logic be input to the 4th with door AND4 one end, Enable Pin EN be connected to the 4th with door AND4 another end, the described the 4th with door AND4 be connected to first or door OR1 another end, first or door OR1 after the first driver DRV1, be connected to the first output HDV of the negative feedback control circuit reclaiming with energy;
Output voltage VO is connected to the normal phase input end of the first comparator C omp1, threshold V T D is connected to the inverting input of the first comparator C omp1, the output of the first comparator C omp1 be connected to first with door AND1 one end, Enable Pin EN through inverter INV1 be connected to first with door AND1 another end; First with door AND1 output be connected to second or door OR2 one end;
The LDP signal of control logic be input to second with door AND2 one end, Enable Pin EN be connected to second with door AND2 another end, described second with door AND2 be connected to second or door OR2 another end, described second or door OR2 after the second driver DRV2, be connected to the second output LDV of the negative feedback control circuit reclaiming with energy.
Wherein, the first reference voltage REF is connected to the normal phase input end of error amplifier EA, output voltage VO is connected to the inverting input of error amplifier EA, the output of error amplifier EA is connected to the normal phase input end of PWM comparator PWMC, pulse voltage RAMP is connected to the inverting input of PWM comparator PWMC, the output of PWM comparator PWMC is connected to the input of logic control, through logic control, produces HDP signal and LDP signal.
Further, operation principle is as follows:
When Enable Pin EN is high level, the HDP signal that logic control produces make the 4th with the output HDA signal of door AND4 be high level, through first or the HDD signal that produces of door OR1 be high level, this HDD high level signal is after the first driver DRV1, conducting the first switch S 1, make the negative feedback control circuit work of reclaiming with energy as conventional negative feedback controller, by feedback voltage, control conducting or the shutoff of the first switch S 1 and second switch S2, the second capacitor C 2 is recharged, and controlling DC-to-DC converter output voltage VO is constant voltage.
When Enable Pin EN is low level, if output voltage VO is greater than threshold V T D(and is generally higher than 0V, but the voltage of a little higher than 0V), the output signal AH of the first comparator C omp1 is high level, input to together with the high level signal ENB producing through inverter INV1 first with a door AND1, a first signal LH who produces with door AND1 is high level, through second or door OR2 and the second driver DRV2 after, the second output LDV of the negative feedback control circuit that control is reclaimed with energy, make second switch S2 conducting, now in the second capacitor C 2, the electric charge of storage flows to ground through inductance L 1 and second switch S2, inductance L 1 is carried out to energy storage.
If output voltage VO is less than threshold V T D(and for example can be designed as 0.1V), the output signal AH of the first comparator C omp1 is low level, input to together with the high level signal ENB producing through inverter INV1 first with a door AND1, a first signal LH who produces with door AND1 is low level, through second or door OR2 and the second driver DRV2 after, control the second output LDV of the negative feedback control circuit reclaiming with energy, control second switch S2 and turn-off, now, the energy storage of inductance L 1 is finished.
Then, the first d type flip flop ffdf1 and the second d type flip flop ffdf2 are that trailing edge triggers, when the output signal AH of the first comparator C omp1 is low level, produce a trailing edge, output signal HHE and the HHA of the first d type flip flop ffdf1 and the second d type flip flop ffdf2 will become high level, cause through first or door OR1 output signal HDD become high level, the HDV of the first driver DRV1 output is high level, control the first switch S 1 conducting, inductance L 1 starts to release energy, its sense of current flows to the node of input supply voltage VIN from the node of output voltage VO, to battery, BAT charges.
Because switch S 1 conducting exists conducting resistance, when electric current flows to supply voltage VIN by inductance L 1, inductance L 1 both end voltage is higher than supply voltage VIN, along with the energy of inductance L 1 has been released gradually, its electric current declines close to 0, when its electric current drops to threshold current (VOS/R
oN, VOS illustrates in Fig. 3, i.e. the second reference voltage, R
oNbe the conducting resistance of the first switch S 1) time, the second comparator is judged when inductance L 1 electric current is less than to threshold current, the output signal IR of the second comparator C omp2 is high level, through the 3rd with door AND3 output signal IRT be high level, through the 3rd or door OR3 output signal RST2 be high level, the output HHA of the second d type flip flop ffdf2 that high level resets is reset to low level, because EN is low level, through the 4th with door AND4 output HDA signal be low level, the first switch S 1 is turn-offed, after this, DC-to-DC converter is just completely in out-of-work state.
Compare with traditional DC-to-DC converter, the present embodiment is receiving that its enable signal EN is from high level becomes low level, DC-to-DC converter can multiplex (MUX) be done (the first second switch S2 conducting of a switch periods, then the first switch S 1 conducting), and traditional DC-to-DC converter show as the first switch S 1 and second switch S2 turn-offs immediately, quit work.
To sum up, the energy being stored in after closing in output capacitance is reclaimed, contribute to raising efficiency.For being powered circuit, be capacitive load (load equivalent is capacitance characteristic), the effect that energy reclaims is better.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a DC-to-DC converter, is characterized in that, described DC-to-DC converter comprises: battery, the negative feedback control circuit, the first switch (S1), second switch (S2), inductance (L1), the second electric capacity (C2) that with energy, reclaim;
Described the first switch (S1) is connected between supply voltage and the first end of described inductance (L1), and the control end of described the first switch (S1) is connected in negative feedback control circuit the first output (HDV) reclaiming with energy;
Described second switch (S2) is connected in first end and the earth terminal of inductance (L1), and the control end of described second switch (S2) is connected in described negative feedback control circuit the second output (LDV) reclaiming with energy;
The second electric capacity is connected between second end and ground end of inductance (L1), to output voltage is provided;
The described negative feedback control circuit reclaiming with energy, first input end is connected to supply voltage (VIN), and the second input is connected to Enable Pin (EN), when Enable Pin (EN) receives disable signal, when negative feedback control circuit detects output voltage (VO) and is greater than threshold voltage (VTD), the second output (LDV) conducting second switch (S2) of the negative feedback control circuit reclaiming with energy, described the second electric capacity (C2) is inductance (L1) electric discharge, when output voltage (VO) is less than threshold voltage (VTD), turn-off described second switch (S2), the first switch (S1) conducting under the control of first output (HDV) of negative feedback control circuit, inductance (L1) electric discharge, battery is charged simultaneously, when negative feedback control circuit detects inductance (L1) electric current and is less than threshold current, the first output (HDV) by negative feedback control circuit turn-offs the first switch (S1), described DC-to-DC converter quits work.
2. DC-to-DC converter as claimed in claim 1, it is characterized in that, when Enable Pin (EN) receives enable signal, the described negative feedback control circuit reclaiming with energy is controlled conducting or the shutoff of the first switch (S1) and second switch (S2) according to feedback voltage.
3. DC-to-DC converter as claimed in claim 1, is characterized in that, described DC-to-DC converter comprises bleeder circuit, and output voltage (VO) is detected; Output voltage (VO) is connected to the 3rd input (FB) of the described negative feedback control circuit reclaiming with energy by bleeder circuit, the described negative feedback control circuit reclaiming with energy compares output voltage (VO) and threshold voltage (VTD) thus.
4. DC-to-DC converter as claimed in claim 1, it is characterized in that, described DC-to-DC converter also comprises: be powered circuit, with described the second electric capacity (C2) parallel connection, when Enable Pin (EN) receives enable signal, described line voltage (VIN) provides operating voltage for the described circuit that is powered.
5. DC-to-DC converter as claimed in claim 1, is characterized in that, the four-input terminal (LX) of the described negative feedback control circuit reclaiming with energy is connected to inductance (L1) first end.
6. DC-to-DC converter as claimed in claim 1, is characterized in that, the described negative feedback control circuit reclaiming with energy comprises error amplifier, PWM comparator (PWMC) and logic control; The first reference voltage (REF) is connected to an input of error amplifier (EA), output voltage (VO) is connected to the another input of error amplifier (EA), the output of error amplifier (EA) is connected to the normal phase input end of PWM comparator (PWMC), pulse voltage (RAMP) is connected to the inverting input of PWM comparator (PWMC), the output of PWM comparator (PWMC) is connected to the input of described logic control, through described logic control, produces HDP signal and LDP signal; When Enable Pin (EN) receives enable signal, the described negative feedback control circuit reclaiming with energy allows described HDP signal and LDP signal to control respectively the first output (HDV) and second output (LDV) of negative feedback control circuit.
7. DC-to-DC converter as claimed in claim 1, is characterized in that, the described negative feedback control circuit reclaiming with energy comprises the first comparator (Comp1), and output voltage (VO) and threshold voltage (VTD) are compared; When Enable Pin (EN) receives disable signal, if output voltage (VO) is greater than threshold voltage (VTD), the output signal AH of the first comparator (Comp1) controls second output (LDV) of the negative feedback control circuit reclaiming with energy, makes second switch (S2) conducting;
When Enable Pin (EN) receives disable signal, if output voltage (VO) is less than threshold voltage (VTD), the output signal AH of the first comparator (Comp1) controls second output (LDV) of the negative feedback control circuit reclaiming with energy, and second switch (S2) is turn-offed.
8. DC-to-DC converter as claimed in claim 7, it is characterized in that, the described negative feedback control circuit reclaiming with energy also comprises the second d type flip flop (ffdf2), and the second d type flip flop (ffdf2) resets according to the output signal AH of the first comparator (Comp1); When Enable Pin (EN) receives disable signal, if output voltage (VO) is less than threshold voltage (VTD), the output signal HHA of the second d type flip flop (ffdf2) controls first output (HDV) of the negative feedback control circuit reclaiming with energy, makes the first switch (S1) conducting.
9. DC-to-DC converter as claimed in claim 1, it is characterized in that, the described negative feedback control circuit reclaiming with energy also comprises the first d type flip flop (ffdf1) and the second comparator (Comp2), the first d type flip flop (ffdf1) resets according to the output signal AH of the first comparator (Comp1), and the second comparator (Comp2) compares inductance (L1) electric current and threshold current; When Enable Pin (EN) receives disable signal, if inductance (L1) electric current is less than threshold current, the output signal HHE of the output signal IR of the second comparator (Comp2) and the first d type flip flop (ffdf1) controls the first input end (HDV) of the negative feedback control circuit reclaiming with energy, and the first switch (S1) is turn-offed.
10. the DC-to-DC converter as described in claim 1-6 any one, it is characterized in that, the described negative feedback control circuit reclaiming with energy comprises: first with door (AND1), second with door (AND2), the 3rd with door (AND3), the 4th with door (AND4), first d type flip flop (ffdf1), first or door (OR1), second or door (OR2), the 3rd or (OR3), inverter (INV1), the first driver (DRV1), the second driver (DRV2);
Supply voltage (VIN) and the second reference voltage (VOS) are connected to the normal phase input end of described the second comparator (Comp2), inductance (L1) voltage is connected to the inverting input of the second comparator (Comp2), the second comparator (Comp2) output be connected to the 3rd with door (AND3) one end, the output of the first d type flip flop (ffdf1) be connected to the 3rd with door (AND3) another end, the 3rd with door output be connected to the 3rd or door (OR3) one end, the Enable Pin (EN) of the first d type flip flop (ffdf1) be connected to the 3rd or door (OR3) another end, the 3rd or the output of door (OR3) be connected to the reset terminal of the second d type flip flop (ffdf2), the output of the second d type flip flop (ffdf2) be connected to first or door (OR1) one end,
The HDP signal of control logic be input to the 4th with door (AND4) one end, Enable Pin (EN) be connected to the 4th with door (AND4) another end, the described the 4th with door (AND4) be connected to first or door (OR1) another end, described first or door (OR1) after the first driver (DRV1), be connected to first output (HDV) of the negative feedback control circuit reclaiming with energy;
Output voltage (VO) is connected to the normal phase input end of the first comparator (Comp1), threshold voltage (VTD) is connected to the inverting input of the first comparator (Comp1), the output of described the first comparator (Comp1) be connected to first with door (AND1) one end, Enable Pin (EN) through inverter (INV1) be connected to first with door (AND1) another end; First with door (AND1) output be connected to second or door (OR2) one end;
The LDP signal of control logic be input to second with door (AND2) one end, Enable Pin (EN) be connected to second with door (AND2) another end, described second with door (AND2) be connected to second or door (OR2) another end, described second or door (OR2) after the second driver (DRV2), be connected to second output (LDV) of the negative feedback control circuit reclaiming with energy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593687.XA CN103607117B (en) | 2013-11-21 | 2013-11-21 | DC-to-dc converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310593687.XA CN103607117B (en) | 2013-11-21 | 2013-11-21 | DC-to-dc converter |
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| CN112803720A (en) * | 2021-03-19 | 2021-05-14 | 中国电子科技集团公司第九研究所 | Power supply voltage monitoring circuit of multi-power supply system |
| CN117526711A (en) * | 2024-01-03 | 2024-02-06 | 拓尔微电子股份有限公司 | Voltage conversion circuit, voltage conversion method and power management chip |
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