CN204271913U - There is the DC-to-DC converter of energy recovery function - Google Patents
There is the DC-to-DC converter of energy recovery function Download PDFInfo
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- CN204271913U CN204271913U CN201420748948.0U CN201420748948U CN204271913U CN 204271913 U CN204271913 U CN 204271913U CN 201420748948 U CN201420748948 U CN 201420748948U CN 204271913 U CN204271913 U CN 204271913U
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Abstract
The utility model provides a kind of DC-to-DC converter with energy recovery function, and it comprises output circuit, the output voltage of sampling power output end obtains sample circuit and the negative feedback control circuit of feedback voltage.Described negative feedback control circuit exports drive control signal based on described feedback voltage, controls the output voltage that the input voltage of power input is converted to power output end by output circuit.Described negative feedback control circuit comprises the controlled energy regenerating path being arranged at power input and power output end, enable signal be invalid and the output voltage of power output end higher than the input voltage of power input and predetermined threshold voltage sum time, this energy regenerating path of conducting, otherwise, disconnect this energy regenerating path.Energy on output capacitance C2 and charged moiety by arranging controlled energy regenerating path at power input and power output end, thus can reclaim, to save energy by the utility model.
Description
[technical field]
The utility model relates to power converter topology field, particularly a kind of DC-to-DC converter with energy recovery function.
[background technology]
Traditional DC-to-DC converter is generally one-way transmission energy, namely always from input power to output loading transmitting energy, as shown in Figure 1.Described DC-to-DC converter includes output circuit 110, sample circuit 120, negative feedback control circuit 130, battery BAT140 and is powered circuit 150.In order to save energy, a lot of system all adopts service intermittent mode, namely the DC-to-DC converter in Fig. 1 is enable and closedown (system service intermittent and dormancy) by batch (-type), when enable signal EN is high level (effectively), negative feedback control circuit 130 works, input voltage VIN (such as 4V) being converted to output voltage VO (such as 10V), providing operating voltage for being powered circuit 150.When enable signal EN is low level, negative feedback control circuit 130 quits work, output voltage VO is sampled resistance R2 and R1 or is powered circuit discharging to zero negative, is bled off by the electric charge of output capacitance C2 in the design also had by being additionally connected to the switch between power output end VO and ground node.When each enable signal EN becomes high level again, output capacitance C2 is charged again; When each enable signal EN becomes low level, output capacitance C2 is completely discharged.When such output capacitance C2 is charged and discharged repeatedly, energy is completely wasted.
Therefore need a kind of improvement project to overcome the impact of above-mentioned technical problem.
[utility model content]
The purpose of this utility model is to provide a kind of DC-to-DC converter, and it can reclaim the portion of energy on output capacitance C2, thus can save energy.
In order to solve the problem, the utility model provides a kind of DC-to-DC converter, and it comprises: output circuit, and it is connected between power input and power output end, and it comprises power switch, sample circuit, its output voltage of sampling described power output end obtains feedback voltage, negative feedback control circuit, constantly replace between conducting and cut-off to control described power switch to the control end of described power switch for exporting drive control signal based on described feedback voltage, and then control the output voltage that the input voltage of power input is converted to power output end by output circuit, described negative feedback control circuit comprises the controlled energy regenerating path being arranged at power input and power output end, the enable signal of described negative feedback control circuit be invalid and the output voltage of power output end higher than the input voltage of power input and predetermined threshold voltage sum time, this energy regenerating path of conducting, make electric current can flow to power input from power output end through described energy regenerating path, otherwise, disconnect this energy regenerating path.
Further, described DC-to-DC converter also comprises and is connected to battery between described power input and ground and electric capacity C1, is powered circuit and is connected between described power output end and ground.
Further, described output circuit comprises inductance L 1, power switch S1, power switch S2 and output capacitance C2, inductance L 1, power switch S2 and output capacitance C2 are series between power input and ground successively, one end of power switch S1 is connected with the intermediate node of inductance L 1 with power switch S2, other end ground connection, the intermediate node of power switch S2 and output capacitance C2 is as described power output end.
Further, described negative feedback control circuit also comprises error amplifier, PWM comparator and output logic drive circuit, the difference of described feedback voltage and reference voltage is carried out amplification and is obtained error amplification signal by described error amplifier, described PWM comparator is used for more described error amplification signal and triangular signal obtains pwm control signal, described output logic drive circuit generates drive control signal based on pwm control signal, and exports described drive control signal the control end of described power switch to.
Further, described output logic drive circuit comprises control logic, with door AND5, with door AND2, first driver element and the second driver element, the input of described control logic receives described pwm control signal, two paths of signals HDP and LDP is formed based on pwm control signal, its first output output signal HDP, second output output signal LDP, describedly to be connected with the first output of control logic with an input of door AND5, another input connects the enable signal of described negative feedback control circuit, describedly to be connected with the second output of control logic with an input of door AND2, another input connects the enable signal of described negative feedback control circuit, the input of the first driver element is connected with the described output with door AND5, its output is connected to the control end of power switch S1, the input of the second driver element is connected with the described output with door AND2, its output is connected to the control end of power switch S2.
Further, described energy regenerating path includes and is connected on diode D3 between power input and power output end and control switch S3, the anode of this diode D3 connects power output end, the negative electrode of this diode D3 connects the defeated input of power supply, described predetermined threshold voltage is the on state threshold voltage of described diode D3, when the enable signal of described negative feedback control circuit is invalid, control described control switch S3 conducting, described negative feedback control circuit quits work, control described power switch and continue cut-off, when the enable signal of described negative feedback control circuit is effective, control described control switch S3 to end, described negative feedback control circuit normally works, control described power switch constantly to replace between conducting and cut-off.
Further, described energy regenerating path includes the control switch S4 be connected between power input and power output end, described negative feedback control circuit also includes the energy regenerating control circuit controlling described control switch S4, described energy regenerating control circuit compares the input voltage of power input and the output voltage of power output end, when the enable signal of described negative feedback control circuit is effective, control described control switch S4 to end, described negative feedback control circuit normally works, control described power switch constantly to replace between conducting and cut-off, the enable signal of described negative feedback control circuit be invalid and output voltage higher than input voltage time, control described control switch S4 conducting, described negative feedback control circuit quits work, described power switch continues cut-off.
Compared with prior art, the energy on output capacitance C2 and charged moiety by arranging controlled energy regenerating path at power input and power output end, thus can reclaim, to save energy by the utility model.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Wherein:
Fig. 1 is the circuit diagram of existing a kind of typical DC-to-DC change-over circuit;
Fig. 2 is the DC-to-DC change-over circuit circuit diagram in one embodiment in the utility model;
Fig. 3 is the negative feedback control circuit circuit diagram in one embodiment in Fig. 2;
Fig. 4 is the negative feedback control circuit circuit diagram in another embodiment in Fig. 2.
[embodiment]
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in further detail the utility model below in conjunction with the drawings and specific embodiments.
Alleged herein " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model.Different local in this manual " in one embodiment " occurred not all refers to same embodiment, neither be independent or optionally mutually exclusive with other embodiments embodiment.Unless stated otherwise, connection herein, be connected, word that the expression that connects is electrically connected all represents and is directly or indirectly electrical connected.
Fig. 2 is the DC-to-DC change-over circuit circuit diagram in one embodiment in the utility model.As shown in Figure 2, described DC-to-DC converter 200 comprises output circuit 210, sample circuit 220, negative feedback control circuit 230.
Described output circuit 210 is connected between power input VIN and power output end VO, and it comprises power switch.As shown in Figure 2, described output circuit 210 comprises inductance L 1, power switch S1, power switch S2 and output capacitance C2, wherein inductance L 1, power switch S2 and output capacitance C2 are series between power input VIN and ground successively, one end of power switch S1 is connected with the intermediate node of inductance L 1 with power switch S2, other end ground connection, the intermediate node of power switch S2 and output capacitance C2 is as described power output end VO.
The sample output voltage of described power output end VO of described sample circuit 220 obtains feedback voltage FB.As shown in Figure 2, described sample circuit 220 comprises sampling resistor R2 and R1 of series connection, and the voltage of the intermediate node between two sampling resistors is exactly feedback voltage FB.
Described negative feedback control circuit 230 constantly replaces between conducting and cut-off to control described power switch to the control end of described power switch for exporting drive control signal based on described feedback voltage FB, and then controls the output voltage that the input voltage of power input VIN is converted to power output end VO by output circuit 210.As shown in Figure 2, negative feedback control circuit 230 exports the first drive control signal NDV to the control end of described power switch S1, export the second drive control signal PDV to the control end of described power switch S2, under the control of drive singal PDV and NDV, when described power switch S1 conducting, described power switch S2 ends, when described power switch S2 conducting, described power switch S1 ends, and achieves power switch S1 and S2 alternate conduction like this.
Described negative feedback control circuit 230 receives enable signal EN.When enable signal EN is effective, described negative feedback control circuit 230 normally works, and output drive control signal controls described power switch S1 and S2 and constantly replaces between conducting and cut-off.When enable signal EN is invalid, described negative feedback control circuit quits work, and controls described power switch S1 and S2 and continues cut-off.Energy can be saved with negative feedback control circuit 230 described in disable by constantly enable.
In one embodiment, described DC-to-DC converter 200 also comprises and is connected to battery 240 between described power input and ground and electric capacity C1.Described battery 240 provides power supply to described power input VIN, and described electric capacity C1 can stablize the voltage of described power input VIN.In other embodiments, battery 240 and electric capacity C1 can not be regarded as a part for described DC-to-DC converter 200, and can be considered to other circuit of coordinating with DC-to-DC converter 200, as external circuit etc.Be powered circuit 250 to be connected between described power output end VO and ground.
Feature of the present utility model, advantage or benefit are: described negative feedback control circuit 230 comprises the controlled energy regenerating path being arranged at power input and power output end, the enable signal EN of described negative feedback control circuit 230 be invalid and the output voltage of power output end higher than the input voltage of power input and predetermined threshold voltage sum time, this energy regenerating path of conducting, make electric current can flow to power input VIN from power output end VO through described energy regenerating path, otherwise, disconnect this energy regenerating path.
Like this, when transducer 200 is in disable state, the energy on output capacitance C2 and charged moiety can be reclaimed, to save energy.For the DC-to-DC converter of frequent starting and closedown, the energy be stored on output capacitance C2 after closedown is reclaimed at every turn, contribute to raising efficiency.For being powered circuit 250 for capacitive load (load equivalent is capacitance characteristic), the effect of energy regenerating is better.
Fig. 3 is the negative feedback control circuit circuit diagram in one embodiment in Fig. 2.As shown in Figure 3, described negative feedback control circuit comprises error amplifier EA, PWM (Pulse Width Modulation) comparator PWMC, output logic drive circuit 330, energy regenerating path 310 and energy regenerating control circuit 320.
As shown in Figure 3, described energy regenerating path 310 comprises and is connected on control switch S3 between power input VIN and power output end VO and diode D3.The anode of this diode D3 connects power output end VO, and the negative electrode of this diode D3 connects the defeated input VIN of power supply through control switch S3.
Described energy regenerating control circuit 320 controls conducting and the cut-off of described control switch S3 based on described enable signal EN.Concrete, described energy regenerating control circuit 320 is the input that an inverter INV1, enable signal EN are connected to described inverter INV1, and the output of described inverter INV1 connects the control end of described control switch S3.Now, enable signal EN is that high level is effective, and low level is invalid.Certainly, in other embodiments, described enable signal EN also can Low level effective, and high level is invalid.
When enable signal EN is invalid, control described control switch S3 conducting, if now input voltage VO is higher than the on state threshold voltage sum of input voltage VIN and diode D3, then diode D3 forward conduction, this energy regenerating path 310 conducting i.e., make electric current can flow to power input VIN from power output end VO through described energy regenerating path 310 like this, achieve energy regenerating.In addition, even if described control switch S3 conducting, if input voltage VO is not higher than the on state threshold voltage sum of input voltage VIN and diode D3, then diode D3 also can not conducting.When enable signal EN is effective, control described control switch S3 and turn off, now described negative feedback control circuit normally works, and normally exports drive control signal to power switch S1 and S2, and described output circuit 210 converts input voltage to output voltage normally.
The difference of described feedback voltage FB and reference voltage REF is carried out amplification and is obtained error amplification signal EAO by described error amplifier EA.Described PWM comparator PWMC is used for more described error amplification signal EAO and triangular signal RAMP and obtains pwm control signal.Described output logic drive circuit 233 generates PWM drive singal based on pwm control signal, and described PWM drive singal is exported to the control end of described power switch S1 and S2.Described enable signal EN is connected to the Enable Pin of described error amplifier EA and described PWM comparator PWMC, when described enable signal EN is invalid, described error amplifier EA and described PWM comparator PWMC quits work, and the drive control signal NDV of output and PDV makes power switch S1 and S2 continue cut-off.
As shown in Figure 3, described output logic drive circuit 233 comprise control logic, with door AND5, with door AND2, the first driver element DRV1 and the second driver element DRV2.
The input of described control logic receives described pwm control signal, forms two paths of signals HDP and LDP based on pwm control signal, its first output output signal HDP, the second output output signal LDP.Describedly be connected with the first output of control logic with an input of door AND5, another input connects enable signal EN.Describedly be connected with the second output of control logic with an input of door AND2, another input connects the enable signal EN of described negative feedback control circuit.The input of the first driver element DRV1 is connected with the described output with door AND5, and its output is connected to the control end of power switch S1.The input of the second driver element DRV2 is connected with the described output with door AND2, and its output is connected to the control end of power switch S2.
Shown in Fig. 2 and Fig. 3, again explain the operation principle of negative feedback control circuit in detail.When EN is high level, its working method is the same with traditional negative feedback control circuit.When EN is high level, be low level through the signal ERS of inverter INV1, control switch S3 is in off state, and error amplifier EA and comparator PWMC is in enabled state.Error amplifier EA compares feedback voltage FB voltage and reference voltage REF, produces error amplification signal EAO.PWM comparator relative error amplifying signal EAO signal and triangular signal RAMP, produce pwm control signal.Pwm control signal produces signal HDP and LDP after control logic.When EN is high level, HDP and LDP signal is allowed to pass through with door AND5 and AND2, form signal LDA and LDP, signal HDA and HDP is just the same, signal LDA and LDP is just the same, after over-drive unit DRV1 and DRV2, produce drive control signal NDV and PDV, and drive control signal NDV and PDV controls power switch S1 and S2 turn-on and turn-off.Signal NDV and PDV is inversion signal substantially, and when namely NDV is high level, PDV is low level; When NDV is low level, PDV is high level.
When feedback voltage FB is higher than reference voltage REF, the adjustment of above-mentioned negative feedback control circuit 230 reduces the duty ratio of signal NDV, causes output voltage VO to reduce, then also reduces through the feedback voltage FB of over-sampling circuit 220 dividing potential drop; When feedback voltage FB is lower than reference voltage REF, the adjustment of above-mentioned negative feedback control circuit 230 increases the duty ratio of signal NDV, causes output voltage VO to raise, then also raises through the feedback voltage FB of over-sampling circuit 220 dividing potential drop.When such feedback loop is stablized, feedback voltage FB equals reference voltage REF, loop just stops adjustment, now output voltage VO=VREF. (R1+R2)/R1, wherein VO is the magnitude of voltage of power output end, VREF is the magnitude of voltage of reference voltage REF, and R1 is the resistance value of resistance R1, and R2 is the resistance value of resistance R2.
When EN is low level, ERS is high level, cause control switch S3 conducting, if output voltage is higher than VIN+VD3, then VO discharges to VIN, VD3 is the on state threshold voltage of diode D3, and the portion of energy now on output capacitance C2 is charged to the battery BAT of power input VIN, reclaims portion of energy; When VO is discharged to lower than VIN+VD3, stop electric discharge, energy regenerating release.
Fig. 4 is the negative feedback control circuit circuit diagram in another embodiment in Fig. 2.As shown in the figure, the negative feedback control circuit in Fig. 4 comprises error amplifier EA, PWM comparator PWMC, output logic drive circuit 430, energy regenerating path 410 and energy regenerating control circuit 420 equally.Be with the difference of the negative feedback control circuit in Fig. 3: the concrete structure of energy regenerating path 410 and energy regenerating control circuit 420, identical all with Fig. 3 of all the other structures and its principle.
As shown in Figure 4, described energy regenerating path 410 comprises the control switch S4 be connected between power input VIN and power output end VO.Described energy regenerating control circuit 232 comprise comparator Comp2, inverter INV1 and with door AND3, the input of described inverter INV1 is connected with enable signal EN, the output of described inverter INV1 is connected with an input of door AND3 with described, an input of described comparator Comp2 connects power output end VO, another input connects power input VIN, its output connects and another input of door AND3, the described control end with the output connection control switch S 4 of door AND3.
When the enable signal EN of described negative feedback control circuit is effective, no matter the output of comparator Comp2 is high level, or low level, capital controls described control switch S4 and ends, now described negative feedback control circuit 230 normally works, and controls described power switch S1 and S2 and constantly replaces between conducting and cut-off.The enable signal EN of described negative feedback control circuit be invalid and output voltage higher than input voltage (now described comparator Comp2 export high level) time, control described control switch S4 conducting.Now, described negative feedback control circuit quits work, and controls described power switch S1 and S2 and continues cut-off.Now, the described predetermined threshold voltage above mentioned can be considered to equal 0.
Concrete, as shown in Figure 4, when signal EN is high level, feedback loop normally works, by FB Voltage Cortrol to reference voltage REF, and now output voltage VO=VREF. (R1+R2)/R1.When EN is low level, the ENB signal of signal EN after INV1 is high level, now when output voltage VO is higher than input voltage VIN, the signal COM2 that comparator Comp2 exports is high level, through with door AND3 after signal ERS be high level, control switch S4 conducting, such output voltage VO is charged to the battery BAT of power input through control switch S4, reclaims the portion of energy on output capacitance C2.When the signal COM2 that comparator Comp2 exports is low level, when namely output voltage VO is lower than input voltage VIN, be low level with the output signal ERS of door AND3, control switch S4 turns off, energy regenerating release.
In the utility model, " connection ", " being connected ", " company ", " connecing " etc. represent the word be electrically connected, and if no special instructions, then represent direct or indirect electric connection.
It is pointed out that the scope be familiar with person skilled in art and any change that embodiment of the present utility model is done all do not departed to claims of the present utility model.Correspondingly, the scope of claim of the present utility model is also not limited only to previous embodiment.
Claims (7)
1. a DC-to-DC converter, is characterized in that, it comprises:
Output circuit, it is connected between power input and power output end, and it comprises power switch;
Sample circuit, its output voltage of sampling described power output end obtains feedback voltage;
Negative feedback control circuit, constantly replace between conducting and cut-off to control described power switch to the control end of described power switch for exporting drive control signal based on described feedback voltage, and then control the output voltage that the input voltage of power input is converted to power output end by output circuit
Described negative feedback control circuit comprises the controlled energy regenerating path being arranged at power input and power output end, the enable signal of described negative feedback control circuit be invalid and the output voltage of power output end higher than the input voltage of power input and predetermined threshold voltage sum time, this energy regenerating path of conducting, make electric current can flow to power input from power output end through described energy regenerating path, otherwise, disconnect this energy regenerating path.
2. DC-to-DC converter according to claim 1, is characterized in that, it also comprises and is connected to battery between described power input and ground and electric capacity C1, is powered circuit and is connected between described power output end and ground.
3. DC-to-DC converter according to claim 1, is characterized in that, described output circuit comprises inductance L 1, power switch S1, power switch S2 and output capacitance C2,
Inductance L 1, power switch S2 and output capacitance C2 are series between power input and ground successively,
One end of power switch S1 is connected with the intermediate node of inductance L 1 with power switch S2, other end ground connection,
The intermediate node of power switch S2 and output capacitance C2 is as described power output end.
4. DC-to-DC converter according to claim 3, is characterized in that, described negative feedback control circuit also comprises error amplifier, PWM comparator and output logic drive circuit,
The difference of described feedback voltage and reference voltage is carried out amplification and is obtained error amplification signal by described error amplifier, described PWM comparator is used for more described error amplification signal and triangular signal obtains pwm control signal, described output logic drive circuit generates drive control signal based on pwm control signal, and exports described drive control signal the control end of described power switch to.
5. DC-to-DC converter according to claim 4, is characterized in that, described output logic drive circuit comprise control logic, with door AND5, with door AND2, the first driver element and the second driver element,
The input of described control logic receives described pwm control signal, forms two paths of signals HDP and LDP based on pwm control signal, its first output output signal HDP, the second output output signal LDP,
Describedly be connected with the first output of control logic with an input of door AND5, another input connects the enable signal of described negative feedback control circuit,
Describedly be connected with the second output of control logic with an input of door AND2, another input connects the enable signal of described negative feedback control circuit,
The input of the first driver element is connected with the described output with door AND5, and its output is connected to the control end of power switch S1,
The input of the second driver element is connected with the described output with door AND2, and its output is connected to the control end of power switch S2.
6. according to the arbitrary described DC-to-DC converter of claim 1-5, it is characterized in that, described energy regenerating path includes and is connected on diode D3 between power input and power output end and control switch S3, the anode of this diode D3 connects power output end, the negative electrode of this diode D3 connects the defeated input of power supply
Described predetermined threshold voltage is the on state threshold voltage of described diode D3,
When the enable signal of described negative feedback control circuit is invalid, control described control switch S3 conducting, described negative feedback control circuit quits work, control described power switch and continue cut-off, when the enable signal of described negative feedback control circuit is effective, control described control switch S3 to end, described negative feedback control circuit normally works, and controls described power switch and constantly replaces between conducting and cut-off.
7., according to the arbitrary described DC-to-DC converter of claim 1-5, it is characterized in that, described energy regenerating path includes the control switch S4 be connected between power input and power output end,
Described negative feedback control circuit also includes the energy regenerating control circuit controlling described control switch S4, and described energy regenerating control circuit compares the input voltage of power input and the output voltage of power output end,
When the enable signal of described negative feedback control circuit is effective, control described control switch S4 and end, described negative feedback control circuit normally works, and controls described power switch and constantly replaces between conducting and cut-off,
The enable signal of described negative feedback control circuit be invalid and output voltage higher than input voltage time, control described control switch S4 conducting, described negative feedback control circuit quits work, described power switch continue cut-off.
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| CN201420748948.0U CN204271913U (en) | 2014-12-03 | 2014-12-03 | There is the DC-to-DC converter of energy recovery function |
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| CN201420748948.0U CN204271913U (en) | 2014-12-03 | 2014-12-03 | There is the DC-to-DC converter of energy recovery function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467410A (en) * | 2014-12-03 | 2015-03-25 | 无锡中星微电子有限公司 | Direct current-direct current converter with energy recovery function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467410A (en) * | 2014-12-03 | 2015-03-25 | 无锡中星微电子有限公司 | Direct current-direct current converter with energy recovery function |
| CN104467410B (en) * | 2014-12-03 | 2017-02-22 | 无锡中感微电子股份有限公司 | Direct current-direct current converter with energy recovery function |
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Address after: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214028 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: Wuxi Vimicro Co., Ltd. |
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Granted publication date: 20150415 Termination date: 20161203 |
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