CN117040242A - Low-power-consumption boost circuit for weak energy collection - Google Patents

Low-power-consumption boost circuit for weak energy collection Download PDF

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Publication number
CN117040242A
CN117040242A CN202310932409.6A CN202310932409A CN117040242A CN 117040242 A CN117040242 A CN 117040242A CN 202310932409 A CN202310932409 A CN 202310932409A CN 117040242 A CN117040242 A CN 117040242A
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China
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control module
voltage
comparator
module
current
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李儒�
程傒
黄洪伟
戴加良
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Shenzhen Injoinic Technology Co Ltd
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Shenzhen Injoinic Technology Co Ltd
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Priority to CN202310932409.6A priority Critical patent/CN117040242A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application provides a low-power-consumption boost circuit for weak energy collection, which comprises the following components: the device comprises a weak current source, a voltage monitoring module, a zero-crossing comparator, a control module, a charging module, an inductor, an input capacitor and a switch module, wherein the weak current source is connected with one end of the input capacitor, one end of the voltage monitoring module and one end of the inductor; the voltage monitoring module is used for outputting an enabling signal; the other end of the inductor is connected with one input end of the charging module, the switching module and the zero-crossing comparator; the charging module is also connected with the control module; the switch module is also connected with the other input end of the zero-crossing comparator, the control module and the voltage output port; the output end of the zero-crossing comparator is connected with the control module; the other end of the input capacitor is grounded. The embodiment of the application can provide a low-power-consumption boost circuit for weak energy collection.

Description

Low-power-consumption boost circuit for weak energy collection
Technical Field
The application relates to the technical field of electronics or chips, in particular to a low-power-consumption boost circuit for weak energy collection.
Background
In practical application, the weak energy collection technology refers to a technology that low-power consumption electronic equipment can collect energy from weak energy sources of mu W to mW levels such as solar energy, natural light, heat sources and the like to supply power, so that extremely long-time continuous voyage, even infinite continuous voyage, is realized. At present, the technology is widely applied to the fields of wearable equipment, implantable medical devices, infinite sensors, remote control devices, internet of things and the like. The collection of weak energy is an important research point, so how to provide a low-power boost circuit for weak energy collection is needed to be solved.
Disclosure of Invention
The embodiment of the application provides a low-power-consumption boost circuit for weak energy collection, which can provide a low-power-consumption boost circuit for weak energy collection.
In a first aspect, an embodiment of the present application provides a low-power-consumption boost circuit for weak energy collection, where the low-power-consumption boost circuit includes: the device comprises a weak current source, a voltage monitoring module, a zero-crossing comparator, a control module, a charging module, an inductor, an input capacitor and a switch module, wherein the weak current source is connected with one end of the input capacitor, one end of the voltage monitoring module and one end of the inductor; the voltage monitoring module is used for outputting an enabling signal; the other end of the inductor is connected with one input end of the charging module, the switching module and the zero-crossing comparator; the charging module is also connected with the control module; the switch module is also connected with the other input end of the zero-crossing comparator, the control module and the voltage output port; the output end of the zero-crossing comparator is connected with the control module; the other end of the input capacitor is grounded.
In a second aspect, an embodiment of the present application provides a chip, where the chip includes a low-power boost circuit for weak energy harvesting according to the first aspect.
In a third aspect, an embodiment of the present application provides an electronic device, where the electronic device includes the low-power boost circuit for weak energy harvesting according to the first aspect, or the electronic device includes the chip according to the second aspect.
The embodiment of the application has the following beneficial effects:
the low-power consumption boost circuit based on weak energy collection provided by the embodiment of the application comprises: the device comprises a weak current source, a voltage monitoring module, a zero-crossing comparator, a control module, a charging module, an inductor, an input capacitor and a switch module, wherein the weak current source is connected with one end of the input capacitor, one end of the voltage monitoring module and one end of the inductor; the voltage monitoring module is used for outputting an enabling signal; the other end of the inductor is connected with one input end of the charging module, the switching module and the zero-crossing comparator; the charging module is also connected with the control module; the switch module is also connected with the other input end of the zero-crossing comparator, the control module and the voltage output port; the output end of the zero-crossing comparator is connected with the control module; the other end of the input capacitor is grounded, the automatic adjustment of the charging current is realized by the charging module, the charging module is used for detecting the current flowing through the inductor and adjusting the voltage value which can be achieved by the charging module through adjusting the voltage of the control module, and the maximum value which can be achieved by the inductor current is also adjusted, so that the low-power-consumption boost circuit for weak energy collection can be provided, the energy intensity of weak energy sources can be monitored in real time, and the charging current is automatically adjusted according to the energy intensity of the weak energy sources, so that the charging efficiency of the boost circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low-power boost circuit for collecting very weak energy according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another low-power boost circuit with very weak energy harvesting according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another low-power boost circuit with very weak energy harvesting according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a weak current source according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a voltage monitoring module according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a zero-crossing comparator according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an overcurrent comparator according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a current control module according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a logic control module according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a timing control module according to an embodiment of the present application;
fig. 11 is a schematic diagram illustrating non-overlapping signals of a timing control module according to an embodiment of the present application.
Detailed Description
For better understanding of the technical solutions of the present application by those skilled in the art, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the description of the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, software, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Embodiments of the present application are described below with reference to the accompanying drawings, in which the crossing points of intersecting conductors have dots to indicate that the conductors are connected, and the non-dots at the crossing points indicate that the conductors are not connected.
Referring to fig. 1, an embodiment of the present application provides a low-power-consumption boost circuit for weak energy collection, the low-power-consumption boost circuit includes: weak current source, voltage monitoring module, zero-crossing comparator, control module, charging module, inductance L0, input capacitance Cin, and switch module,
the weak current source is connected with one end of the input capacitor Cin, the voltage monitoring module and one end of the inductor L0; the voltage monitoring module is used for outputting an enable signal EN; the other end of the inductor L0 is connected with one input end of the charging module, the switching module and the zero-crossing comparator; the charging module is also connected with the control module; the switch module is also connected with the other input end of the zero-crossing comparator, the control module and the voltage output port Vout; the output end of the zero-crossing comparator is connected with the control module; the other end of the input capacitor Cin is grounded.
In the embodiment of the application, the automatic adjustment of the charging current is realized by the charging module, and essentially, the charging module detects the current flowing through the inductor and adjusts the voltage value which can be achieved by the charging module by adjusting the voltage of the control module, so that the maximum value which can be achieved by the inductor current is adjusted, thereby providing a low-power consumption boost circuit for weak energy collection, monitoring the energy intensity of weak energy in real time, and automatically adjusting the charging current according to the energy intensity so as to improve the charging efficiency of the boost circuit.
Optionally, as shown in fig. 2, fig. 2 is a low-power boost circuit for weak energy collection, where the control module includes: a logic control module and a time sequence control module; the logic control module is connected with the time sequence control module; the logic control module is also connected with the output ends of the charging module and the zero-crossing comparator; the time sequence control module is also connected with the charging module and the switch module.
In the embodiment of the application, the automatic adjustment of the charging current is realized by the charging module, essentially, the charging module detects the current flowing through the inductor and adjusts the voltage value which can be achieved by the charging module by adjusting the voltage of the logic control module through the time sequence control module, so that the maximum value which can be achieved by the inductor current is adjusted, thereby providing the low-power consumption boost circuit for weak energy collection, monitoring the energy intensity of weak energy in real time, and automatically adjusting the charging current according to the energy intensity so as to improve the charging efficiency of the boost circuit.
Optionally, as shown in fig. 3, the charging module includes: the device comprises an overcurrent comparator, a current control module and a first power tube MN;
the other end of the inductor is connected with the drain electrode of the first power tube MN; the logic control module is connected with the output end of the overcurrent comparator; the time sequence control module is also connected with the grid electrode of the first power tube MN, the source electrode of the first power tube MN is grounded, the drain electrode of the first power tube MN is also connected with one input end of the overcurrent comparator, and the other input end of the overcurrent comparator is connected with the current control module.
In the embodiment of the application, the automatic adjustment of the charging current is realized by the current control module, essentially, the current control module detects the current flowing through L0, and adjusts the voltage value which can be reached by Vlst by adjusting the voltage of I_ctrl, namely, the maximum value which can be reached by the L0 current.
Further, optionally, as shown in fig. 3, the switch module includes a second power tube MP; the other end of the inductor L0 is connected with the source electrode of the second power tube MP; and the grid electrode of the second power tube MP is connected with the time sequence control module, and the drain electrode of the second power tube MP is connected with the other input end of the zero-crossing comparator and the voltage output port.
In the embodiment of the application, the automatic adjustment of the charging current is realized by the current control module, essentially, the current control module detects the current flowing through L0, and adjusts the voltage value which can be reached by Vlst by adjusting the voltage of I_ctrl, namely, the maximum value which can be reached by the L0 current.
Optionally, the drain electrode of the second power tube is connected with one end of the load capacitor; the other end of the load capacitor is grounded.
In a specific implementation, if there is no load capacitor, the Vout voltage may have larger noise, and after the load capacitor is added, the Vout voltage may not have larger noise.
In a specific implementation, a low-power-consumption boost circuit for weak energy collection comprises: the device comprises a weak current source, a voltage monitoring module, a zero-crossing comparator, an overcurrent comparator, a logic control module, a time sequence control module, a current control module, a first power tube MN, a second power tube MP, an inductance L0, an input capacitor Cin and a load capacitor CL,
the weak current source is connected with one end of the input capacitor Cin, the voltage monitoring module and one end of the inductor L0; the voltage monitoring module is also used for inputting an enabling signal En; the other end of the inductor L0 is connected with the drain electrode of the first power tube MN, the source electrode of the second power tube MP and one input end of the zero-crossing comparator; the grid electrode of the second power tube MP is connected with the time sequence control module, and the drain electrode of the second power tube MP is connected with the other input end of the zero-crossing comparator, the load capacitor CL and the voltage output port Vout; the output end of the zero-crossing comparator is connected with the logic control module; the logic control module is also connected with the output end of the overcurrent comparator, the current control module and the time sequence control module; the time sequence control module is also connected with the grid electrode of the first power tube MN, the source electrode of the first power tube MN is grounded, the drain electrode of the first power tube MN is also connected with one input end of the overcurrent comparator, and the other input end of the overcurrent comparator is connected with the current control module.
In the embodiment of the application, the low-power consumption boost circuit for weak energy collection can comprise a weak current source, a voltage monitoring module, a zero-crossing comparator, an overcurrent comparator, a logic control module, a time sequence control module, a current control module, an NMOS power tube MN, a PMOS power tube MP, an inductor L0, an input capacitor Cin and a load capacitor CL. One end of the input capacitor Cin is connected with a weak current source, and the other end of the input capacitor Cin is grounded.
In the embodiment of the application, the automatic adjustment of the charging current is realized by the current control module, essentially, the current control module detects the current flowing through L0, and adjusts the voltage value which can be reached by Vlst by adjusting the voltage of I_ctrl, namely, the maximum value which can be reached by the L0 current.
Optionally, in a specific implementation, the weak current source is used for generating energy voltage; the voltage monitoring module is used for monitoring the energy voltage, and specifically comprises the following steps: monitoring whether the energy voltage is in a preset voltage range; and when the energy voltage is in the preset voltage range, the enabling signal is pulled high, and the output voltage port is charged through the low-power-consumption boost circuit.
The preset voltage range may be preset or default.
In a specific implementation, the weak current source can generate a weak energy voltage Vin, voltage monitoring is responsible for monitoring whether the voltage of the Vin is in a required voltage range, when the voltage of the Vin meets the required voltage range, an En signal is pulled high, and then a boost circuit is started to start charging Vout.
Optionally, when the first power tube is turned on, energy of the energy voltage flows through the inductor and the first power tube, energy is stored in the inductor, along with increase of current, vlst voltage of a drain electrode of the first power tube also increases, and i_ctrl voltage of the current control module is used for limiting inductor current;
when the Vlst voltage is higher than the i_ctrl voltage, the output signal i_high of the filtering comparator is pulled up, and after passing through the logic control module and the timing control module, the drain voltage Drn of the first power tube is pulled down, and the first power tube is turned off; the drain voltage Drp of the first power tube is then pulled low, the second power tube is turned on, the Vlst voltage is raised, and the voltage output port is charged through the second power tube, and the inductor current is reduced.
In the embodiment of the application, when the first power tube is opened, energy of energy voltage flows through the inductor and the first power tube, energy is stored in the inductor, along with the increase of current, the Vlst voltage of the drain electrode of the first power tube is also increased, the I_ctrl voltage of the current control module is used for limiting the inductor current, when the Vlst voltage is higher than the I_ctrl voltage, the output signal I_high of the filtering comparator is pulled up, after passing through the logic control module and the time sequence control module, the drain voltage Drn of the first power tube MN is pulled down, and the first power tube MN is closed; then the drain voltage Drp of the first power tube MN is pulled down, the second power tube MP is turned on, the Vlst voltage is raised, vout is charged through the second power tube MP, and the inductor current decreases.
In a specific implementation, the boost charging process: the first power tube MN is turned on first, energy of the energy voltage Vin flows through L0 and MN, the energy is stored in L0, along with the increase of current, the voltage of a Vlst node is also increased, and the voltage I_ctrl is used for limiting the current of the inductor L0; when the Vlst voltage is higher than the i_ctrl voltage, the i_high signal is pulled high, and after passing through the logic control module and the timing control module, drn is pulled low, and the first power tube MN is turned off; subsequently Drp is pulled low and the second power tube MP is turned on, the Vlst voltage is raised due to the freewheeling action of the inductor L0 and Vout is charged through the second power tube MP, and at the same time the inductor current decreases. At this time, the second power tube MP is equivalent to an on-resistance, and when the voltage across the second power tube MP is close to 0, it indicates that the inductor current is reduced to 0, and there is no charging capability. The zero-crossing comparator will pull the i_low signal high at this time, and then the Drp signal is also pulled high and the Drn signal is pulled high. The inductor current begins to increase again and a new round of charging begins.
Optionally, as shown in fig. 4, the weak current source includes: the device comprises a current source, an equivalent diode, a parallel resistor and a series resistor;
the equivalent diode and the parallel resistor are sequentially connected in parallel with the current source, and the current source is also connected in series with the series resistor.
In a specific implementation, the weak current source may include at least one of: solar panels, heat sources, natural light devices, and the like, are not limited herein. Taking a solar panel as an example, as shown in fig. 4, fig. 4 shows an equivalent circuit of a weak current source provided by an embodiment of the present application, where the weak current source may include an endogenous current source Ip, an equivalent diode Dp, a parallel resistor Rp, and a series resistor Rs. The whole solar panel can also be regarded as a voltage source with the internal resistance Rs. For weak energy sources, the Rs resistance will be large, limiting its ability to supply current.
Optionally, as shown in fig. 5, the voltage monitoring module includes: the first comparator, the second comparator, the AND gate and the NOT gate;
the positive input end of the first comparator and the negative input end of the second comparator are connected with weak current sources; the negative input end of the first comparator is used for inputting a first detection threshold voltage; the positive input end of the second comparator is used for inputting a second detection threshold voltage; the output end of the first comparator and the output end of the second comparator are respectively connected with the input end of the AND gate; the output end of the AND gate is connected with the input end of the NOT gate, and the output end of the NOT gate is used for being connected with the enabling signal.
In a specific implementation, vin is a weak current source, so that the available current capability is limited, and the charge stored on Cin is gradually reduced in the charging process of boost, so that the voltage of Vin is also gradually reduced. The voltage monitoring module monitors the voltage value of Vin in real time, and the principle of the voltage monitoring module is shown in fig. 5. When Vin voltage is lower than the detection threshold voltage Vl or Vin voltage is higher than the detection threshold voltage Vh, the EN signal is pulled down, the boost circuit is turned off, and charging is stopped.
In the embodiment of the application, the voltage monitoring module controls the start of the boost circuit by monitoring the voltage range output by the energy source, so that the boost circuit works at the moment with higher efficiency.
The second detection threshold voltage is greater than the first detection threshold voltage, and the first detection threshold voltage and the second detection threshold voltage can be preset or default.
Optionally, the zero-crossing comparator is configured to detect a voltage across the second power tube, and when the voltage difference exists across the second power tube, the Vlst node voltage is higher than the node voltage of the voltage output port, which indicates that the charging current is still positive, and allows charging of the voltage output port;
when the voltage of the Vlst node is reduced to be equal to the node voltage of the voltage output port, and the charging current is reduced to 0, the zero-crossing comparator pulls the output comparison signal I_low high, and the second power tube is closed through the logic control module and the time sequence control module, and the first power tube is opened.
The zero-crossing comparator is used for detecting the voltage at two ends of the second power tube, when the voltage difference exists at two ends of the second power tube, when the voltage of the Vlst node is higher than the voltage of the Vout node, the charging current is still positive, the Vout is allowed to be charged, when the voltage of the Vlst node is reduced to be equal to the voltage of the Vout, the charging current is reduced to 0, at the moment, the zero-crossing comparator pulls the output comparison signal I_low high, the PMOS power tube MP is closed through a logic control and time sequence control module, and the NMOS power tube MN is opened.
In a specific implementation, the zero-crossing comparator is used for detecting voltages at two ends of the PMOS power tube, and when a voltage difference exists at two ends of the PMOS tube, that is, when the Vlst node voltage is higher than the Vout node voltage, the charging current is still positive, and Vout can still be charged. When the voltage of the Vlst node drops to be equal to the Vout voltage, the charging current is reduced to 0, at this time, the zero-crossing comparator pulls up the output comparison signal i_low, and turns off the PMOS power transistor MP through the logic control module and the timing control module, and simultaneously turns on the NMOS power transistor MN.
By way of illustration, a specific circuit embodiment of the zero-crossing comparator is shown in fig. 6. In the embodiment of the application, the zero-crossing comparator adopts a three-stage structure, so that the gain and the speed of the comparator can be increased. The first stage adopts a source electrode following structure to reduce the input common-mode voltage of the comparator, and ensures that the input pair transistors of the second stage work in a saturation region. The second stage adopts a fully differential structure of a resistor load, the output impedance is stable, and the speed of differential output OP/ON can be increased. The third stage uses a current mirror as a load, converting to a single ended output, generally increasing the comparator gain. OP and ON are both equipotential points.
Optionally, the over-current comparator is configured to detect a charging current, and determine whether the inductor current exceeds a limit value by detecting whether the drain terminal voltage Vlst of the first power tube exceeds the i_ctrl voltage.
Wherein, the limit value can be preset or default.
In a specific implementation, the overcurrent comparator is configured to detect a charging current, and determine whether the inductor current exceeds a limit value by detecting whether the drain terminal voltage Vlst of the NMOS power transistor MN exceeds the i_ctrl voltage.
For example, as shown in fig. 7, a specific circuit embodiment of the over-current comparator is shown. In the embodiment of the application, the overcurrent comparator adopts a two-stage structure, so that the gain of the comparator can be increased, and the comparison response speed is increased. OP and ON are both equipotential points.
Optionally, the current control module is used for realizing control of charging current; the current control module is a current control module limited by k-order current, and k is an integer greater than 1.
In a specific implementation, the current control module controls the charging current. Because the weak energy source has uncertain current supply capability, when the boost circuit just starts to work, a smaller limiting current can be set first, after a period of time, if the boost circuit can continue to work, the limiting current is raised by one step, and so on. The order of the limiting current may be set according to actual needs.
For illustration, as shown in fig. 8, an example of a circuit implementation of a current control module with three-level current limiting is shown. In specific implementation, the working principle of current limitation is as follows: MN1/MN2/MN3/MN4 are connected in series, the grid electrode is connected with a power supply, at the moment, MN1/MN2/MN3/MN4 are respectively in a linear region and are equivalent to a resistor, and then voltage V1/V2/V3 is respectively generated through a bias current Ib and used for setting charging current. Assuming that the size of the NMOS power transistor MN in fig. 3 is x times that of MN1/MN2/MN3/MN4 in fig. 8, when Vlst voltage also reaches V1, the current flowing through the power transistor MN is Ib x; when Vlst voltage reaches V2, the current flowing through the power transistor MN is Ib x 2, and similarly, the current limiting currents corresponding to V1/V2/V3 are Ib x,2 Ib x, and 3 Ib x, respectively. Thereby realizing the setting of the charging current.
Before charging starts, the initial state i_hign=0 output by the over-current comparator is turned on, and then both the N1 and N2 nodes are at high level, the N3 node is at high level, and MP2 is turned off. Since en=0, node N4 is reset to 0, and both comparators output vc1 and vc2 are 0, then decoder output S <2:0> =001, where the default choice is the minimum current voltage, i_ctrl=v1.
After the charging starts, the NMOS power transistor MN is turned on, the current flowing through MN starts to increase from 0, the voltage of the Vlst node increases, when the Vlst voltage reaches the V1 voltage, the output i_high of the overcurrent comparator is pulled up, and at this time, since the potential of the N1 node is kept high, the resistor R1 is required to discharge the C1, so that the voltage of the N1 node can be pulled down, so that the N1 node and the N2 node are both kept at high level for a certain time t1, and the time t1 is determined by the values of R1 and C1. Then in time t1, the voltage of N3 is pulled down, MP2 starts to turn on, and the capacitor C2 of the node N4 is charged for time t1. As long as the voltage at the N4 node does not exceed VR1, the limit value of the charging current is maintained at the first order, i.e., i_ctrl=v1. When the voltage at the N4 node exceeds VR1 and is lower than VR2, vc1=1 and vc2=0, and the decoder output S <2:0> =010, the limit value of the charging current is raised to the second level, i.e., i_ctrl=v2. Similarly, when the voltage at the N4 node exceeds VR2, vc1=1 and vc2=1, and the decoder output S <2:0> =100, the limit value of the charging current is raised to the third level, i.e., i_ctrl=v3.
In particular implementations, in fig. 8, the voltages of VR1 and VR2 are obtained by dividing the power supply by R2/R3/R4, which is just one specific example of a circuit, and may be obtained by other forms of voltage division.
In the embodiment of the application, the scheme of gradually increasing the charging current by adopting multi-stage current control can more efficiently extract energy from weak energy, and under the condition that the energy intensity is uncertain and how much current can be provided, the charging is started from the minimum current, and if the boost circuit can work normally, the charging current is continuously increased until the charging is finally carried out at the maximum current level.
The current control circuit has simple structural design, realizes time sequence control by charging resistance and capacitance, and can effectively reduce the static power consumption of the circuit. Accurate multi-stage control current is more easily obtained by generating the reference voltage VR1/VR2 through resistive voltage division and generating the control current voltage i_ctrl by using NMOS matched to the power transistor in series.
Optionally, the logic control module is configured to perform logic operation on detection signals of the zero-crossing comparator and the over-current comparator to generate a logic signal l_ctrl, where l_ctrl is used to switch the first power tube and the second power tube.
In a specific implementation, the logic control module is mainly implemented to perform logic operation on detection signals of the zero-crossing comparator and the overcurrent comparator to generate a logic signal l_ctrl for switching the first power tube MN and the second power tube MP.
For illustration, as shown in fig. 9, an example of a circuit implementation of a logic control module is shown. The logic control module may comprise 4 AND gates and 5 NOT gates.
Specifically, the output end of the first not gate access signal Drp is connected to one input end of the first and gate, the other input end of the first and gate is connected to a signal i_low, the output end of the first and gate is connected to one input end of the second and gate, the other input end of the second and gate is connected to an enable signal En, the output end of the second and gate is connected to the input end of the second not gate, the output end of the second not gate is connected to one input end of the third and gate, the other input end of the third and gate is connected to the output end of the third not gate, the output end of the third and gate is connected to the input end of the fourth and gate, the input end of the fourth and gate is connected to a signal l_ctrl, the enable signal En is also connected to one input end of the fourth and gate, the other input end of the fourth and gate is connected to the output end of the fifth and the output end of the fourth and gate is connected to the input end of the third not gate.
In the embodiment of the application, the logic control module mainly realizes the switching of the power tube of the boost circuit. The first power tube is started first, the second power tube is closed, and at the moment, the inductor is charged and stores energy; then, the L_ctrl signal is turned over, the power tube is switched, the second power tube is turned on, the first power tube is turned off, and the capacity stored in the inductor is charged to the output end through the second power tube.
Optionally, the timing control module is configured to generate non-overlapping control signals Drp and Drn; and then the second power tube and the first power tube are respectively connected through the control signals Drp and Drn.
In the embodiment of the application, in order to improve the charging efficiency of the boost circuit and avoid leakage current caused by short-time simultaneous conduction of the PMOS power tube and the NMOS power tube in the switching process, the L_ctrl signal is required to pass through the time sequence control module to generate non-overlapping control signals Drp and Drn, and then the PMOS power tube MP and the NMOS power tube MP are respectively controlled, so that leakage current in the switching process is avoided.
For illustration, an example of a circuit implementation of the timing control module is shown in fig. 10. The time sequence control module can comprise 8 NOT gates, 2 AND gates and one NOR gate.
The input signal in is respectively connected with one input end of a fifth AND gate and one input end of a fifth NOT gate, the output end of the fifth NOT gate is connected with the input end of a sixth NOT gate and one input end of a NOR gate, the output end of the sixth NOT gate is connected with the input end of a seventh NOT gate, the output end of the seventh NOT gate is connected with the other input end of the NOR gate, the output end of the eighth NOT gate is connected with the signal Drp, the other input end of the fifth AND gate is also connected with the output end of a ninth NOT gate and the input end of the tenth NOT gate, the output end of the tenth NOT gate is connected with the input end of the eleventh NOT gate and one output end of the sixth AND gate, the output end of the twelfth NOT gate is connected with the other input end of the sixth AND gate, the output end of the sixth AND gate is connected with the input end of the thirteenth NOT gate, and the output end of the thirteenth NOT gate is connected with the signal Drn.
In the embodiment of the application, as shown in fig. 11, a non-overlapping signal is generated by a timing control module, and the power tubes are switched by using the non-overlapping signals Drp and Drn, so that a transient through phenomenon of the two power tubes in the switching process can be avoided, and the discharge of charges to the ground through the two power tubes at the output end is avoided. The charging efficiency of the boost circuit is improved.
The low-power consumption boost circuit based on weak energy collection provided by the embodiment of the application comprises: the device comprises a weak current source, a voltage monitoring module, a zero-crossing comparator, an overcurrent comparator, a logic control module, a time sequence control module, a current control module, a first power tube, a second power tube, an inductor, an input capacitor and a load capacitor, wherein the weak current source is connected with one end of the input capacitor, one end of the voltage monitoring module and one end of the inductor; the voltage monitoring module is used for inputting an enabling signal; the other end of the inductor is connected with the drain electrode of the first power tube, the source electrode of the second power tube and one input end of the zero-crossing comparator; the grid electrode of the second power tube is connected with the time sequence control module, and the drain electrode of the second power tube is connected with the other input end of the zero-crossing comparator, the load capacitor and the voltage output port; the output end of the zero-crossing comparator is connected with the logic control module; the logic control module is also connected with the output end of the overcurrent comparator, the current control module and the time sequence control module; the time sequence control module is also connected with the grid electrode of the first power tube, the source electrode of the first power tube is grounded, the drain electrode of the first power tube is also connected with one input end of the overcurrent comparator, the other input end of the overcurrent comparator is connected with the current control module, a low-power consumption boost circuit for weak energy collection can be provided, the energy intensity of weak energy sources can be monitored in real time, and the charging current is automatically adjusted according to the energy intensity, so that the charging efficiency of the boost circuit is improved.
The embodiment of the application also provides a chip which can comprise the low-power-consumption boost circuit for collecting weak energy.
The embodiment of the application also provides electronic equipment which can comprise the low-power-consumption boost circuit for weak energy collection and/or a chip.
The foregoing is a description of embodiments of the present application, and it should be noted that, for those skilled in the art, modifications and variations can be made without departing from the principles of the embodiments of the present application, and such modifications and variations are also considered to be within the scope of the present application.

Claims (10)

1. A low power boost circuit for weak energy harvesting, the low power boost circuit comprising: weak current source, voltage monitoring module, zero-crossing comparator, control module, charging module, inductance, input capacitance, and switch module,
the weak current source is connected with one end of the input capacitor, one end of the voltage monitoring module and one end of the inductor; the voltage monitoring module is used for outputting an enabling signal; the other end of the inductor is connected with one input end of the charging module, the switching module and the zero-crossing comparator; the charging module is also connected with the control module; the switch module is also connected with the other input end of the zero-crossing comparator, the control module and the voltage output port; the output end of the zero-crossing comparator is connected with the control module; the other end of the input capacitor is grounded.
2. The low power boost circuit of claim 1, wherein the control module comprises: a logic control module and a time sequence control module; the logic control module is connected with the time sequence control module; the logic control module is also connected with the output ends of the charging module and the zero-crossing comparator; the time sequence control module is also connected with the charging module and the switch module.
3. The low power boost circuit of claim 2, wherein the charging module comprises: the device comprises an overcurrent comparator, a current control module and a first power tube;
the other end of the inductor is connected with the drain electrode of the first power tube; the logic control module is connected with the output end of the overcurrent comparator; the time sequence control module is also connected with the grid electrode of the first power tube, the source electrode of the first power tube is grounded, the drain electrode of the first power tube is also connected with one input end of the overcurrent comparator, and the other input end of the overcurrent comparator is connected with the current control module.
4. The low power boost circuit of claim 3, wherein the switching module comprises a second power transistor; the other end of the inductor is connected with the source electrode of the second power tube; and the grid electrode of the second power tube is connected with the time sequence control module, and the drain electrode of the second power tube is connected with the other input end of the zero-crossing comparator and the voltage output port.
5. The low power boost circuit of claim 4, wherein the drain of the second power tube is connected to one end of a load capacitor; the other end of the load capacitor is grounded.
6. The low power boost circuit of any one of claims 1-5, wherein the weak current source comprises: the device comprises a current source, an equivalent diode, a parallel resistor and a series resistor;
the equivalent diode and the parallel resistor are sequentially connected in parallel with the current source, and the current source is also connected in series with the series resistor.
7. The low power boost circuit of claim 6, wherein said voltage monitoring module comprises: the first comparator, the second comparator, the AND gate and the NOT gate;
the positive input end of the first comparator and the negative input end of the second comparator are connected with weak current sources; the negative input end of the first comparator is used for inputting a first detection threshold voltage; the positive input end of the second comparator is used for inputting a second detection threshold voltage; the output end of the first comparator and the output end of the second comparator are respectively connected with the input end of the AND gate; the output end of the AND gate is connected with the input end of the NOT gate, and the output end of the NOT gate is used for being connected with the enabling signal.
8. The low power boost circuit of claim 7, wherein the zero-crossing comparator is configured to detect a voltage across the second power tube, and when the Vlst node voltage is higher than the node voltage of the voltage output port when there is a voltage difference across the second power tube, it indicates that the charging current is still positive, allowing charging of the voltage output port;
when the voltage of the Vlst node is reduced to be equal to the node voltage of the voltage output port, and the charging current is reduced to 0, the zero-crossing comparator pulls the output comparison signal I_low high, and the second power tube is closed through the logic control module and the time sequence control module, and the first power tube is opened.
9. The low power boost circuit of claim 7, wherein the over-current comparator is configured to detect a charging current, and determine whether the inductor current exceeds a threshold by detecting whether the drain terminal voltage Vlst of the first power transistor exceeds the i_ctrl voltage.
10. The low power boost circuit of claim 7, wherein said current control module is configured to implement control of a charging current; the current control module is a current control module limited by k-order current, and k is an integer greater than 1.
CN202310932409.6A 2023-07-26 2023-07-26 Low-power-consumption boost circuit for weak energy collection Pending CN117040242A (en)

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CN202310932409.6A CN117040242A (en) 2023-07-26 2023-07-26 Low-power-consumption boost circuit for weak energy collection

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117347702A (en) * 2023-12-04 2024-01-05 晶艺半导体有限公司 Zero-crossing detection circuit, starting circuit and zero-crossing detection method for Boost circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117347702A (en) * 2023-12-04 2024-01-05 晶艺半导体有限公司 Zero-crossing detection circuit, starting circuit and zero-crossing detection method for Boost circuit
CN117347702B (en) * 2023-12-04 2024-02-27 晶艺半导体有限公司 Zero-crossing detection circuit, starting circuit and zero-crossing detection method for Boost circuit

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