CN113131589A - Constant power supply module and integrated circuit - Google Patents
Constant power supply module and integrated circuit Download PDFInfo
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- CN113131589A CN113131589A CN202110581822.3A CN202110581822A CN113131589A CN 113131589 A CN113131589 A CN 113131589A CN 202110581822 A CN202110581822 A CN 202110581822A CN 113131589 A CN113131589 A CN 113131589A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies 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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Abstract
The invention discloses a constant power supply module and an integrated circuit.A control unit calculates to obtain output power according to output voltage and output current and judges whether the output power is smaller than a preset target power or not; if the output power is smaller than the preset target power, the control unit enables the power supply unit to adjust the output voltage up through the resistance feedback network by adjusting the control signal down, and finally the purpose of adjusting the output power up is achieved. The invention provides three resistance feedback networks, which are respectively as follows: the feedback circuit comprises a voltage and current control composite resistance feedback network, a voltage control composite resistance feedback network and a current control composite feedback network. The invention adopts the control unit to send the control signal to the resistance feedback network, adjusts the output voltage of the power supply unit, realizes constant power output, and has simple structure and wide application range.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a constant power supply module and an integrated circuit.
Background
In this ampere of electric system, often require the consumer to be equipped with redundant power supply, traditional redundant power supply all sets up in this ampere of power supply, supplies power for single or many equipment through long cable, and when the cable broke down, redundant power supply will also become invalid. And due to the supply of electricityThe voltage of the system is generally 12-24 VDC, the power supply distance is generally 1-6 km, 18V power supply is adopted, and the thickness of the system is 0.75mm2The cable (distributed resistance: 26 omega/km), the distance of 1km and the peak current of the electric equipment of 300 mA. The voltage drop of the cable is 26 omega/km 2 km 300mA which is 15.6V, the voltage of the two ends of the electric equipment is 18-15.6V which is 2.4V, and the voltage drop of the cable is very serious, thereby causing the insufficient loading capacity.
Because the power of the electric equipment has wave crests and wave troughs, the power supply scheme needs to be designed according to the sum of the maximum instantaneous power of the electric equipment, if the electric equipment is provided with a battery and is charged by using a constant power supply, as long as the charging power is greater than the average power consumption of the equipment, the power supply scheme only needs to be designed according to the charging power, and the loading capacity is greatly improved. The existing charging circuit is a constant voltage and constant current power supply, and the output stage is as follows: the trickle charge stage-constant current charge stage-constant voltage charge stage-end of charge cannot meet the requirement of constant power charge.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a constant power supply module and an integrated circuit, and aims to realize constant power output.
First aspect
The invention provides a constant power supply module, which comprises a first power supply unit, a first voltage detection unit, a first current detection unit, a first control unit and a voltage and current control composite resistance feedback network, wherein the first power supply unit comprises a first power supply unit, a first voltage detection unit, a first current detection unit, a first control unit and a voltage and current control composite resistance feedback network;
the first voltage detection unit is used for detecting a first output voltage of the first power supply unit;
the first current detection unit is used for detecting a first output current of the first power supply unit;
the first control unit is used for generating a first control signal according to the first output voltage and the first output current;
the voltage and current control composite resistance feedback network is used for integrating the first output voltage, the first output current and the first control signal to generate a first feedback signal and sending the first feedback signal to the feedback end of the first power supply unit;
the first power supply unit adjusts the voltage value of the first output voltage according to the first feedback signal;
the voltage and current control composite resistance feedback network comprises a first voltage feedback branch resistor, a first current feedback branch resistor, a first control feedback branch resistor and a first grounding resistor; the first voltage feedback branch resistor is connected between the output end and the feedback end of the first power supply unit; the first current feedback branch resistor is connected between the feedback end of the first power supply unit and the output end of the first current detection unit; the first control feedback branch resistor is connected between the feedback end of the first power supply unit and the output end of the first control unit; the first grounding resistor is connected between the feedback end of the first power supply unit and the ground.
The constant power supply circuit provided by the invention can realize constant power output, has an adjustable constant power value, and meets the requirement of constant power charging in an intrinsic safety system.
Preferably, the first voltage feedback branch resistance RvA first current feedback branch resistor RiAnd a first ground resistance RgThe calculation formula of (a) is as follows:
wherein, VfIs the feedback point voltage of the first power supply unit; vvIs the output voltage of the first power supply unit; viIs the output voltage of the first current detection unit; vvmaxIs the maximum output voltage of the first power supply unit; vimaxIs the maximum output voltage of the first current detection unit; vcmaxIs the maximum output voltage of the first control unit.
Preferably, the first control unit is configured to generate a first control signal according to the first output voltage and the first output current, specifically: the first control unit calculates to obtain output power according to the first output voltage and the first output current, and judges whether the output power is smaller than a preset target power; if so, the first control unit generates a first lower control signal; if not, the control unit generates a first upper control signal.
Preferably, the first control unit is further configured to determine whether the first output voltage of the first power supply unit is greater than a preset trickle voltage, and if so, the first control unit sets the preset target power equal to the preset constant power.
Preferably, if the first output voltage is less than or equal to a preset trickle voltage, the first control unit determines whether the preset constant power is greater than the preset trickle power, and if so, the first control unit sets a preset target power equal to the preset trickle power; if not, the first control unit sets the preset target power to be equal to the preset constant power.
Preferably, the first control unit is further configured to determine whether the first output voltage is smaller than a preset upper voltage limit, if not, the first control unit generates a second down control signal and sends the second down control signal to the first power supply unit, and the first power supply unit down-regulates the output voltage according to the second down control signal.
Preferably, the first control unit is further configured to determine whether the output current is smaller than a preset current upper limit, if not, the first control unit generates a third down control signal and sends the third down control signal to the first power supply unit, and the first power supply unit down-regulates the output voltage according to the third down control signal.
Second aspect of the invention
The invention provides a constant power supply module, which comprises a second power supply unit, a second voltage detection unit, a second current detection unit, a second control unit and a voltage control composite resistance feedback network, wherein the second voltage detection unit is connected with the second current detection unit;
the second voltage detection unit is used for detecting a second output voltage of the second power supply unit;
the second current detection unit is used for detecting a second output current of the second power supply unit;
the second control unit is used for generating a second control signal according to a second output voltage and a second output current;
the voltage control composite resistance feedback network is used for integrating the second output voltage and the second control signal to generate a second feedback signal and sending the second feedback signal to the feedback end of the second power supply unit;
the second power supply unit adjusts the voltage value of the second output voltage according to the second feedback signal;
the voltage control composite resistance feedback network comprises a second voltage feedback branch resistance, a second control feedback branch resistance and a second grounding resistance; the second voltage feedback branch resistor is connected between the output end and the feedback end of the second power supply unit; the second control feedback branch resistor is connected between the feedback end of the second power supply unit and the output end of the control unit; the second grounding resistor is connected between the feedback end of the second power supply unit and the ground.
Third aspect of the invention
The invention provides a constant power supply module, which comprises a third power supply unit, a third voltage detection unit, a third current detection unit, a third control unit and a current control composite resistance feedback network, wherein the third voltage detection unit is connected with the third current detection unit;
the third voltage detection unit is used for detecting a third output voltage of a third power supply unit;
the third current detection unit is used for detecting a third output current of a third power supply unit;
the third control unit is used for generating a third control signal according to a third output voltage and a third output current;
the current control composite resistance feedback network is used for integrating the third output current and the third control signal to generate a third feedback signal and sending the third feedback signal to the feedback end of the third power supply unit;
the third power supply unit adjusts the voltage value of the third output voltage according to the feedback signal;
the current control composite resistance feedback network comprises a second current feedback branch resistor, a third control feedback branch resistor and a third grounding resistor; the second current feedback branch resistor is connected between the feedback end of the third power supply unit and the output end of the third current detection unit; the third control feedback branch resistor is connected between the feedback end of the third power supply unit and the output end of the third control unit; the third grounding resistor is connected between the feedback end of the third power supply unit and the ground.
Fourth aspect of the invention
The invention provides an integrated circuit comprising a constant power supply module according to the first aspect. The integrated circuit provided by the invention can be used as a functional circuit of other applications to charge a battery. The charging device can be arranged in the electric equipment as a battery, so that the failure of a redundant power supply caused by cable faults is avoided, the problem of serious cable voltage drop caused by too long power supply distance is solved, and the real effective redundancy effect is realized.
The invention has the beneficial effects that: the control unit is adopted to send a control signal to the power supply unit through the resistance feedback network, the output voltage of the power supply unit is adjusted, constant power output is achieved, the constant power value can be adjusted according to actual conditions, and the requirement of constant power charging in the intrinsic safety system is met. The voltage and current control composite resistance feedback network, the voltage control composite resistance feedback network and the current control composite resistance feedback network are designed, on one hand, output power, voltage and current fluctuation caused by load fluctuation can be effectively avoided, on the other hand, when a battery or a circuit has a specific fault, the output voltage cannot exceed a safety range, and the reliability and the safety are improved. The power supply unit is a common voltage-stabilized power supply in the market, can be a linear power supply such as an LDO (low dropout regulator) or a switching power supply such as a buck power supply.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic block diagram of embodiment 1 of the present invention;
fig. 2 is a schematic circuit diagram of embodiment 1 of the present invention;
FIG. 3 is a flowchart of the operation of embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of output power regulation;
FIG. 5 is a schematic diagram of output voltage regulation;
FIG. 6 is a schematic diagram of output current regulation;
FIG. 7 is a schematic block diagram of embodiment 2 of the present invention;
fig. 8 is a schematic block diagram of embodiment 3 of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
An embodiment of the present invention provides a constant power supply module, as shown in fig. 1 and 2, including a power supply unit, a voltage detection unit, a current detection unit, a control unit, and a voltage-current control composite resistance feedback network. The voltage detection unit is used for detecting the output voltage of the power supply unit, the current detection unit is used for detecting the output current of the power supply unit, and the control unit is used for generating a control signal according to the output voltage and the output current. The voltage and current control composite resistance feedback network is used for integrating the output voltage, the output current and the control signal to generate a feedback signal and sending the feedback signal to a feedback end of the power supply unit, and the power supply unit adjusts the voltage value of the output voltage according to the feedback signal so as to realize constant power output of the power supply unit. The power supply unit may be any power supply with a voltage feedback terminal. The voltage and current control composite resistance feedback network integrates the output voltage, the output current and the control signal of the control unit and inputs the integrated output voltage, the output current and the control signal of the control unit to the feedback end of the power supply unit, the output voltage of the power supply unit is simultaneously fed back by the output voltage, the output current and the control signal of the control unit, and the control signal of the control unit is an analog signal processed by a DAC (digital-to-analog conversion) and a voltage following circuit. The voltage detection unit is a voltage sampling analog circuit. The current detection unit is an analog circuit that converts a current into a voltage and performs amplification processing.
The voltage and current control composite resistance feedback network comprises a voltage feedback branch resistor, a current feedback branch resistor, a control feedback branch resistor and a grounding resistor. The voltage feedback branch resistor is connected between the output end and the feedback end of the power supply unit, the current feedback branch resistor is connected between the feedback end of the power supply unit and the output end of the current detection unit, the control feedback branch resistor is connected between the feedback end of the power supply unit and the output end of the control unit, and the grounding resistor is connected between the feedback end of the power supply unit and the ground.
The working flow of the embodiment of the invention is shown in fig. 3, and comprises the following steps:
the method comprises the following steps: program initialization: the control unit presets the control signal to be the maximum value and carries out floating point integer operation. Because the floating-point operation consumes a lot of time, the operation speed can be greatly improved by performing integer type on the floating-point operation in the program initialization stage, and the step two is entered;
step two: detecting output voltage and current: collecting output voltage and output current, converting voltage and current analog signals into digital signals by the control unit through the ADC, calculating charging power, and entering the third step;
step three: calculating the target power: the control unit judges whether the output voltage is greater than a preset trickle voltage or not, and if the output voltage is greater than the preset trickle voltage, the control unit sets a preset target power equal to a preset constant power; if the output voltage is less than or equal to the preset trickle voltage, the control unit further judges whether the preset constant power is greater than the preset trickle power, and if the preset constant power is greater than the preset trickle power, the control unit sets a preset target power equal to the preset trickle power; if the preset constant power is smaller than or equal to the preset trickle power, the control unit sets the preset target power to be equal to the preset constant power, and the step four is carried out;
the step three is used for realizing an output stage under the condition of smaller output voltage, namely a preset trickle power output stage. The trickle-current power output stage is preset to be a protective output stage under the condition that the voltage of the battery to be charged is too low, and the battery to be output is damaged when the output is too fast.
Step four: output overvoltage protection: the control unit judges whether the output voltage is smaller than a preset voltage upper limit, if not, the control unit controls signals to enable the power supply unit to lower the output voltage through a resistance feedback network, and if so, the control unit further judges whether the output current is smaller than the preset current upper limit. If not, the control unit controls the signal to make the power supply unit down-regulate the output voltage through the resistance feedback network, and finally down-regulate the output current, and if so, the control unit further judges whether the output power is smaller than the preset target power. If not, the control signal on the control unit enables the power supply unit to down-regulate the output voltage through the resistance feedback network, and finally the output power is down-regulated. If yes, the control unit down-regulates the control signal to enable the power supply unit to up-regulate the output voltage through the resistance feedback network, and finally down-regulates the output power. In this embodiment, the control signal is completed through the DAC, and in other embodiments, the control signal may be completed through other methods;
step five: and the control unit enters a sleep power-saving program after completing the primary control process, simultaneously starts a timing awakening program, presets awakening time according to actual conditions, automatically awakens the MCU after the preset awakening time is up, and re-enters the step two. The design of the sleep power-saving program and the timing awakening program reduces the power consumption of the control circuit and improves the power efficiency.
In fig. 1, the magnitude of each branch resistance (Rv, Ri, Rc, Rg) determines the voltage, current, feedback capability of control, and control range. The current detection unit and the control unit determine the output power and the power regulation precision under a specific output voltage.
In this embodiment, Vc is a control analog voltage of the control unit, Vo is an output voltage of the power supply unit, Io is an output current of the power supply unit, Vi is an output voltage of the current detection unit, Po is an output power of the power supply unit, and Vf is an output voltage of the resistive feedback network. The control unit obtains the output voltage Vo and the output current Io through the voltage detection unit and the current detection unit by ADC (analog-to-digital conversion), and then calculates the output power Po. If the output power Po is greater than the preset target power, the control signal Vc is regulated and controlled on the control unit, the output signal Vf of the resistance feedback network rises, the power supply unit regulates the output voltage Vo according to Vf, the output current Io drops when the output voltage Vo drops for the resistive load, and finally the output power Po drops, as shown in fig. 4; and vice versa.
The voltage and current control composite resistance feedback network also has the capability of automatically inhibiting output voltage fluctuation by hardware. The output voltage Vo rises to cause the output voltage Vf of the resistive feedback network to rise, and the power supply unit adjusts the output voltage Vo down according to Vf, as shown in fig. 5; and vice versa.
The voltage and current control composite resistance feedback network also has the capability of inhibiting output current fluctuation by hardware. The output current Vo rises to cause the output voltage Vi of the current detection unit to rise, the output voltage Vf of the resistance feedback network rises, the power supply unit down-regulates the output voltage Vo according to Vf, and the output voltage Vo of the resistive load drops to cause the output current Io to drop, as shown in fig. 6; and vice versa.
In this embodiment, the following settings are set:
Rg: ground resistance of feedback network
Rv: voltage feedback branch resistance of feedback network
Ri: current feedback branch resistance of feedback network
Rc: controlled feedback branch resistance of feedback network
Vf: feedback point voltage of power supply unit
Vv: constant power circuit output voltage
Vi: output voltage of current detection unit
Vc: control signal output voltage
Vvmax: maximum output voltage of constant power circuit
Vvt: trickle first output voltage threshold for battery
Vimax: maximum output voltage of current detection unit
Vcmax: maximum output voltage of control signal
RD: current sampling resistor of current detection unit
G: voltage amplification factor of current detection unit
σI→V: the current-voltage conversion coefficient of the current detection unit is in omega
ΔVc: control signal resolution voltage of control unit
ΔVi: when the output voltage is constant, the output adjusting voltage of the current detecting unit corresponding to the signal resolution voltage is controlled
ΔPc: output regulated power
Pmax: maximum output power of the circuit as a whole
The lithium battery is charged through the embodiment, and the specific hardware circuit calculation process is as follows:
a) true Vvmax、Vvt: according to the characteristics of the lithium battery, taking Vvmax＝4.2V，Vvt＝2.7V；
b) Determining Vimax: according to the characteristics of the current detection unit, V is takenimax＝3.0V；
c) Determining Vcmax: according to the characteristics of the control unit, take Vcmax＝3.0V；
d) Determining Vf: according to the characteristics of the power supply unit, take Vf＝0.8V。
e) Calculation of Rv: to ensure circuit safety, at Vc＝VcmaxWhen, Vv＝0V，Vi0V. Get Rc1000k Ω, calculated according to the following formula: rv＝2471kΩ；
f) Calculation of Ri: calculated according to the following formula: ri＝1599kΩ；
g) Calculation of Rg: calculated according to the following formula: rg＝581kΩ；
h) And (4) rechecking the control range: confirming the control range of the control unit under different output voltages by adjusting V in step ev、ViThe value of (c) is adjusted. The present embodiment does not relate to;
i) impedance matching accounting of the resistance feedback network: according to the impedance characteristics of the feedback end of the power supply unit, the output end of the current detection unit and the output end of the control signal, R is adjusted in equal proportionc、Rv、Ri、RgAnd (4) finishing. The present embodiment does not relate to;
j) calculating sigmaI→V: according to the current-sensing cell design, RD0.03 Ω, and G101, calculated according to the following formula: sigmaI→V＝3.03Ω；
σI→V＝RDG
k) Calculating Δ Vc、ΔVi: using a 12-bit DAC as the control signal output, Δ Vc0.81mV, according to the following formula: Δ Vi＝1.3mV
l) calculating Δ Pc: when V isv＝VvmaxWhen is Δ PcAt the lowest, it is given by the following formula: delta Pc＝1.79mW；
m) calculating
Calculated according to the following formula, if
Then
n) calculation
Calculated according to the following formula:
o) design result arrangement: the results of the steps of l, m and n are arranged as the following table, and the maximum output power Pmax2673mW, output power adjustment accuracy Δ Pc1.79mW, the output power adjustment percentage precision is less than 0.07 percent;
p) Power adjustment accuracy Δ PcDesign objective review: if the power adjustment accuracy is Δ PcAnd if the design target is not met, recalculating the steps j and k, and adjusting the DAC digit. The present embodiment does not relate to;
q) maximum output power PmaxDesign objective review: if the maximum output power PmaxAnd if the design target is not met, step j is recalculated. By adjusting RDAnd G. This embodiment is not concerned.
Based on the same inventive concept, the embodiment of the invention also provides an integrated circuit, which comprises the constant power supply module. The integrated circuit that this embodiment was realized can regard as this ampere of electrical system's redundant power supply, sets up inside the consumer, need not supply power for the consumer through long cable, has not only avoided the cable fault to lead to redundant power failure, has still solved the power supply distance and has long led to the very serious problem of cable voltage drop, has reached real effectual redundant effect.
Example 2
An embodiment of the present invention provides a constant power supply module, as shown in fig. 7, including a power supply unit, a voltage detection unit, a current detection unit, a control unit, and a voltage control composite resistance feedback network. The voltage detection unit is used for detecting the output voltage of the power supply unit, the current detection unit is used for detecting the output current of the power supply unit, and the control unit is used for generating a control signal according to the output voltage and the output current. The voltage control composite resistance feedback network is used for generating a feedback signal according to the output voltage and the control signal and sending the feedback signal to a feedback end of the power supply unit, and the power supply unit adjusts the voltage value of the output voltage according to the feedback signal. The voltage control composite resistance feedback network comprises a voltage feedback branch resistor, a control feedback branch resistor and a grounding resistor. The voltage feedback branch resistor is connected between the output end and the feedback end of the power supply unit, the control feedback branch resistor is connected between the feedback end of the power supply unit and the output end of the control unit, and the grounding resistor is connected between the feedback end of the power supply unit and the ground.
Compared with embodiment 1, the present embodiment has no current feedback branch resistance, a simpler structure, and the capability of suppressing voltage fluctuation by hardware. The power supply unit, the voltage detection unit, the current detection unit and the control unit are the same as the corresponding units in embodiment 1, and the work flow is the same, which is not described herein again. In other embodiments, the power supply unit, the voltage detection unit, the current detection unit, and the control unit may be different from those of embodiment 1.
Based on the same inventive concept, an embodiment of the present invention further provides an integrated circuit, including the constant power output module described in this embodiment.
Example 3
An embodiment of the present invention provides a constant power supply module, as shown in fig. 8, including a power supply unit, a voltage detection unit, a current detection unit, a control unit, and a current control composite resistance feedback network. The voltage detection unit is used for detecting the output voltage of the power supply unit, the current detection unit is used for detecting the output current of the power supply unit, and the control unit is used for generating a control signal according to the output voltage and the output current. The current control composite resistance feedback network is used for integrating the output current and the control signal to generate a feedback signal and sending the feedback signal to a feedback end of the power supply unit, and the power supply unit adjusts the voltage value of the output voltage according to the feedback signal. The current control composite resistance feedback network comprises a current feedback branch resistance, a control feedback branch resistance and a grounding resistance. The current feedback branch resistor is connected between the feedback end of the power supply unit and the output end of the current detection unit, the control feedback branch resistor is connected between the feedback end of the power supply unit and the output end of the control unit, and the grounding resistor is connected between the feedback end of the power supply unit and the ground.
Compared with embodiment 1, the present embodiment has no voltage feedback branch resistance, has a simpler structure, and has the capability of hardware to suppress current fluctuation. The power supply unit, the voltage detection unit, the current detection unit and the control unit are the same as the corresponding units in embodiment 1, and the work flow is the same, which is not described herein again. In other embodiments, the power supply unit, the voltage detection unit, the current detection unit, and the control unit may be different from those of embodiment 1.
Based on the same inventive concept, an embodiment of the present invention further provides an integrated circuit, including the constant power output module described in this embodiment.
In the constant power supply module and the integrated circuit provided in embodiments 1 to 3, the control unit is adopted to send the control signal to the power supply unit through the resistance feedback network, and the output voltage of the power supply unit is adjusted to achieve constant power output, and the constant power value can be adjusted according to actual conditions. The voltage and current control composite resistance feedback network, the voltage control composite resistance feedback network and the current control composite resistance feedback network are designed, on one hand, output power, voltage and current fluctuation caused by load fluctuation can be effectively avoided, on the other hand, when a battery or a circuit has a specific fault, the output voltage cannot exceed a safety range, and the reliability and the safety are improved. The power supply unit in the embodiment of the invention is a common voltage-stabilized power supply in the market, can be a linear power supply such as an LDO (low dropout regulator) or a switching power supply such as a buck power supply.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. The utility model provides a constant power module, includes first power supply unit, its characterized in that: the device also comprises a first voltage detection unit, a first current detection unit, a first control unit and a voltage and current control composite resistance feedback network;
the first voltage detection unit is used for detecting a first output voltage of the first power supply unit;
the first current detection unit is used for detecting a first output current of the first power supply unit;
the first control unit is used for generating a first control signal according to the first output voltage and the first output current;
the voltage and current control composite resistance feedback network is used for integrating the first output voltage, the first output current and the first control signal to generate a first feedback signal and sending the first feedback signal to the feedback end of the first power supply unit;
the first power supply unit adjusts the voltage value of the first output voltage according to the first feedback signal;
the voltage and current control composite resistance feedback network comprises a first voltage feedback branch resistor, a first current feedback branch resistor, a first control feedback branch resistor and a first grounding resistor; the first voltage feedback branch resistor is connected between the output end and the feedback end of the first power supply unit; the first current feedback branch resistor is connected between the feedback end of the first power supply unit and the output end of the first current detection unit; the first control feedback branch resistor is connected between the feedback end of the first power supply unit and the output end of the first control unit; the first grounding resistor is connected between the feedback end of the first power supply unit and the ground.
2. The constant power supply module according to claim 1, wherein: the first voltage feedback branch resistor RvA first current feedback branch resistor RiAnd a first ground resistance RgThe calculation formula of (a) is as follows:
wherein, VfIs the feedback point voltage of the first power supply unit; vvIs the output voltage of the first power supply unit; viIs the output voltage of the first current detection unit; vvmaxIs the maximum output voltage of the first power supply unit; vimaxIs the maximum output voltage of the first current detection unit; vcmaxIs the maximum output voltage of the first control unit.
3. The constant power supply module according to claim 1, wherein: the first control unit is used for generating a first control signal according to the first output voltage and the first output current, and specifically comprises: the first control unit calculates to obtain output power according to the first output voltage and the first output current, and judges whether the output power is smaller than a preset target power; if so, the first control unit generates a first lower control signal; if not, the control unit generates a first upper control signal.
4. The constant power supply module according to claim 1, wherein: the first control unit is further used for judging whether the first output voltage of the first power supply unit is larger than a preset trickle voltage or not, and if yes, the first control unit sets a preset target power equal to a preset constant power.
5. The constant power supply module according to claim 4, wherein: if the first output voltage is less than or equal to the preset trickle voltage, the first control unit judges whether the preset constant power is greater than the preset trickle power, and if so, the first control unit sets the preset target power to be equal to the preset trickle power; if not, the first control unit sets the preset target power to be equal to the preset constant power.
6. The constant power supply module according to claim 1, wherein: the first control unit is further used for judging whether the first output voltage is smaller than a preset voltage upper limit, if not, the first control unit generates a second down-regulation control signal and sends the second down-regulation control signal to the first power supply unit, and the first power supply unit down-regulates the output voltage according to the second down-regulation control signal.
7. The constant power supply module according to claim 1, wherein: the first control unit is further used for judging whether the output current is smaller than a preset current upper limit, if not, the first control unit generates a third down-regulation control signal and sends the third down-regulation control signal to the first power supply unit, and the first power supply unit down-regulates the output voltage according to the third down-regulation control signal.
8. The utility model provides a constant power module, includes second power supply unit, its characterized in that: the device also comprises a second voltage detection unit, a second current detection unit, a second control unit and a voltage control composite resistance feedback network;
the second voltage detection unit is used for detecting a second output voltage of the second power supply unit;
the second current detection unit is used for detecting a second output current of the second power supply unit;
the second control unit is used for generating a second control signal according to a second output voltage and a second output current;
the voltage control composite resistance feedback network is used for integrating the second output voltage and the second control signal to generate a second feedback signal and sending the second feedback signal to the feedback end of the second power supply unit;
the second power supply unit adjusts the voltage value of the second output voltage according to the second feedback signal;
the voltage control composite resistance feedback network comprises a second voltage feedback branch resistance, a second control feedback branch resistance and a second grounding resistance; the second voltage feedback branch resistor is connected between the output end and the feedback end of the second power supply unit; the second control feedback branch resistor is connected between the feedback end of the second power supply unit and the output end of the control unit; the second grounding resistor is connected between the feedback end of the second power supply unit and the ground.
9. The utility model provides a constant power module, includes third power supply unit, its characterized in that: the current control circuit also comprises a third voltage detection unit, a third current detection unit, a third control unit and a current control composite resistance feedback network;
the third voltage detection unit is used for detecting a third output voltage of a third power supply unit;
the third current detection unit is used for detecting a third output current of a third power supply unit;
the third control unit is used for generating a third control signal according to a third output voltage and a third output current;
the current control composite resistance feedback network is used for integrating the third output current and the third control signal to generate a third feedback signal and sending the third feedback signal to the feedback end of the third power supply unit;
the third power supply unit adjusts the voltage value of the third output voltage according to the feedback signal;
the current control composite resistance feedback network comprises a second current feedback branch resistor, a third control feedback branch resistor and a third grounding resistor; the second current feedback branch resistor is connected between the feedback end of the third power supply unit and the output end of the third current detection unit; the third control feedback branch resistor is connected between the feedback end of the third power supply unit and the output end of the third control unit; the third grounding resistor is connected between the feedback end of the third power supply unit and the ground.
10. An integrated circuit, characterized in that: comprising a constant power supply module as claimed in any one of claims 1 to 7.
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