CN205544356U - Adopt constant voltage charge circuit that floats ground formula - Google Patents

Adopt constant voltage charge circuit that floats ground formula Download PDF

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Publication number
CN205544356U
CN205544356U CN201620043787.4U CN201620043787U CN205544356U CN 205544356 U CN205544356 U CN 205544356U CN 201620043787 U CN201620043787 U CN 201620043787U CN 205544356 U CN205544356 U CN 205544356U
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China
Prior art keywords
resistance
input
ground
constant voltage
floating ground
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Withdrawn - After Issue
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CN201620043787.4U
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Chinese (zh)
Inventor
王本欣
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SHENZHEN FRECOM ELECTRONICS CO Ltd
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SHENZHEN FRECOM ELECTRONICS CO Ltd
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    • 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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The utility model discloses an adopt constant voltage charge circuit that floats ground formula, it includes: the input anodal with input ground, connect the output of group battery and anodal and float ground, connect in the afterflow energy storage module between the output anodal and superficial ground, concatenate in proper order and floating ground and inputing inductance element and electronic switch (Q1) between the ground, controlling the PWM control module of electronic switch break -make, the utility model discloses utilize floating the configuration mode on ground, combining ordinary topology circuit, carry out constant voltage charge to the battery of a plurality of series connection, improved charging circuit's voltage range and charge efficiency effectively, the strong controllability of practicality is good, the utility model has the advantages of output short circuit protection and overcurrent protection are sensitive, after the output short circuit or transshipping, the circuit is in the light condition completely, makes the circuit be in the most energy -conserving state all the time, adopt the utility model discloses can realize to 2 sections to the charging of 32 economize on electricity pond constant voltages, when the battery change in valuel, as long as the voltage of adjustment input can to circuit work in the optimum.

Description

A kind of constant voltage charging circuit using floating ground formula
Technical field
This utility model relates to charging circuit, particularly relates to a kind of constant voltage charging circuit using floating ground formula.
Background technology
Along with the development of electric power storage technology, the application in people's life and work of the multistage battery gets more and more.Accumulator charging at present uses constant voltage circuit to be charged mostly, and the operating voltage range of existing constant voltage circuit is narrower, it is impossible to meet the requirement of Width funtion output.When battery number changes greatly, battery pressure reduction can be caused to change greatly, charge efficiency can reduce.
Utility model content
This utility model is intended to solve the problems referred to above of prior art, proposes a kind of constant voltage charging circuit using floating ground formula.
For solving above-mentioned technical problem, the technical scheme that the utility model proposes is a kind of constant voltage charging circuit using floating ground formula of design, comprising: connect the input positive pole of DC source and input ground, the output cathode connecting set of cells and floating ground, the afterflow energy-storage module being connected between output cathode and floating ground, the inductance element being sequentially connected in series between floating and input ground and electrical switch, the PWM control module of control electrical switch break-make.
Charging circuit also includes: gathers described output cathode voltage and feeds back the voltage sample module of surveyed output voltage to PWM control module.
Concatenating current sampling module between described electrical switch with input ground, this current sampling module will be surveyed output current feedback to described PWM control module.
Described afterflow energy-storage module includes: be connected in parallel on the 6th electric capacity between described input positive pole and described floating ground, the 7th electric capacity, forward are serially connected in the 3rd diode between inductance element and electrical switch junction point and described input positive pole.
Described PWM control module includes pwm chip and peripheral circuit thereof.
Described voltage sample module has comparator and three terminal regulator, the 7th resistance and the 8th resistance is concatenated between described input positive pole and floating ground, the contact of the 7th resistance and the 8th resistance connects the inverting input of comparator, the 12nd resistance is concatenated between described input positive pole and floating ground, 9th resistance and the tenth resistance, the contact of the 9th resistance and the tenth resistance connects the input in the same direction of comparator, the contact of the 12nd resistance and the 9th resistance connects the negative electrode of three terminal regulator and controls pole, the negative electrode of three terminal regulator connects floating ground, the inverting input of comparator connects the outfan of comparator by the 6th resistance connected and the 5th electric capacity, the outfan of comparator feeds back surveyed output voltage by the 5th resistance to pwm chip.
Described current sampling module includes: be serially connected in the 3rd resistance between described electrical switch and input ground, and the contact of the 3rd resistance and electrical switch is surveyed output electric current by the 4th resistance to pwm chip feedback, and the grounding leg of pwm chip connects input ground.
Described inductance element uses transformator, the primary side winding of described transformator be serially connected in described floatinglyly and between electrical switch, described 3rd diode forward is serially connected between primary side winding and electrical switch junction point and described input positive pole;Described transformer secondary winding one end connects described input ground, the other end is powered to described PWM control module.
The other end of described transformer secondary winding connects the anode of the second diode, the negative electrode of the second diode is powered to described pwm chip and connects the negative electrode of the first Zener diode (ZD1) and one end of the first resistance (R1) and one end of the second electric capacity (C2), the other end of the first resistance connects described input positive pole, and the other end of the second electric capacity connects described input ground.
It is connected the first electric capacity between described input positive pole with input ground.
Compared with prior art, this utility model utilizes the frame mode on floating ground, in conjunction with common topological circuit, the battery of multiple series connection is carried out constant-voltage charge, is effectively improved voltage range and the charge efficiency of charging circuit, and practical controllability is good;This utility model has output short circuit protection and the sensitive advantage of overcurrent protection, when, after output short-circuit or overload, circuit is completely in Light Condition, makes circuit be in the most energy-conservation state all the time;Use this utility model can realize the charging to 2 joints to 32 batteries constant voltages, when number of batteries changes, as long as adjusting the voltage of input, in order to the optimum state that circuit works in.
Accompanying drawing explanation
Fig. 1 is the theory diagram of this utility model preferred embodiment;
Fig. 2 is the circuit diagram of this utility model preferred embodiment.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is described in further detail.Should be appreciated that specific embodiment described herein is used only for explaining this utility model, be not used to limit this utility model.
Referring to the theory diagram shown in Fig. 1, floating ground formula constant voltage charging circuit that this utility model discloses is comprising: connect the input positive pole of DC source and input ground, the output cathode connecting set of cells and floating ground, the afterflow energy-storage module being connected between output cathode and floating ground, the inductance element being sequentially connected in series between floating and input ground and electrical switch Q1, the PWM control module of control electrical switch break-make.
This utility model utilizes the frame mode on floating ground, in conjunction with common topological circuit, improve the scope of battery operating voltage, and the processing mode on floating ground is the most ingenious, the energy storage utilizing electric capacity realizes floating ground, the benchmark of circuit is to determine with the positive pole of input power, and the height of voltage determines the current potential on floating ground, it may also be said to be to be operated in the way of negative pressure;Owing to being on the basis of positive polarity, so current sampling can only be sampled at the positive pole of power supply, do current sampling with an independent comparator, equally accomplish precisely, to improve efficiency.Plus output protection circuit, make two part circuit perfect adaptations, thus improve the reliability of circuit.
Circuit diagram referring to the preferred embodiment shown in Fig. 2, main circuit carries out PWM with pwm chip U1 and produces switching signal and Isobarically Control, 4 feet of U1 and 8 feet composition PWM drive, by conducting and the cut-off of Q1, input energy is transferred to rear class by T1, and by the isolation of Q1, making output earth potential different from input earth potential, output ground becomes floating ground.Floating ground pressure reduction is relevant to the conducting degree of Q1.Q1, R3 constitute pressure limiting circuit, allow T1 carry out inputting and exporting the conversion of energy by the break-make of Q1, and R3 limits maximum output electric current.
In the preferred embodiment, charging circuit also includes: gathers described output cathode voltage and feeds back the voltage sample module of surveyed output voltage to PWM control module.Concatenating current sampling module between described electrical switch with input ground, this current sampling module will be surveyed output current feedback to described PWM control module.
Referring to the circuit diagram of the preferred embodiment shown in Fig. 2, described afterflow energy-storage module includes: be connected in parallel on the 6th electric capacity C6 between described input positive pole and described floating ground, the 7th electric capacity C7, forward are serially connected in the 3rd diode D3 between inductance element and electrical switch Q1 junction point and described input positive pole.C6, C7, D3 form afterflow energy storage, the afterflow power supply circuits of filtering.The main work function of C6 and C7 is will to eliminate because of topological circuit produced dynamic effect when on off state, make to be in floating stable duty.
Described PWM control module includes pwm chip U1 and peripheral circuit thereof.
nullCircuit diagram referring to the preferred embodiment shown in Fig. 2,Described voltage sample module has comparator (U2A) and three terminal regulator U3,The 7th resistance R7 and the 8th resistance R8 is concatenated between described input positive pole and floating ground,The contact of the 7th resistance and the 8th resistance connects the inverting input of comparator,The 12nd resistance R12 is concatenated between described input positive pole and floating ground、9th resistance R9 and the tenth resistance R10,The contact of the 9th resistance and the tenth resistance connects the input in the same direction of comparator,The contact of the 12nd resistance and the 9th resistance connects the negative electrode of three terminal regulator and controls pole,The anode of three terminal regulator connects floating ground,The inverting input of comparator connects the outfan of comparator by the 6th resistance R6 and the 5th electric capacity C5 of series connection,The outfan of comparator feeds back surveyed output voltage by the 5th resistance R5 to pwm chip U1.Owing to this charging circuit is on the basis of positive pole, so sample circuit is necessarily at positive pole, when input voltage height, meeting rising simultaneously floatingly, because be a variable floatingly, it can change along with the change of input voltage.In order to realize the constant of output voltage, it is that circuit provides a constant datum mark by R12, U3, R9, R10, and the voltage sampling signal after R7 Yu R8 dividing potential drop and datum mark carry out voltage ratio relatively, the FB voltage of pwm chip U1 is regulated by U2A comparator, thus adjust the pulsewidth of Q1, thus reach to export the purpose of constant voltage.
Circuit diagram referring to the preferred embodiment shown in Fig. 2, described current sampling module includes: be serially connected in the 3rd resistance R3 between described electrical switch Q1 and input ground, the contact of the 3rd resistance and electrical switch is surveyed output electric current by the 4th resistance R4 to pwm chip U1 feedback, and the grounding leg of pwm chip connects input ground.R3 is current-limiting resistance, by Q1 with being serially connected in input and between floating ground, when Q1 turns on, export because when battery charges, load strengthens, electric current now by Q1 Yu R3 strengthens, and can produce pressure reduction at R3 two ends, and this pressure reduction is transferred to the CS foot of U1 by R4 and C3, regulated the pulsewidth of Q1 by the height of CS current potential, thus reach to export the purpose of constant voltage.When R3 flows through at electric current excessive, when causing potential difference on R3 to protect voltage higher than the CS that U1 sets, U1 closes 4 foot GATA waveforms outputs, with making input and completely isolated between floating ground, and power supply overcurrent protection.The size of overcurrent protection electricity depends on the size of R3 resistance.
Described inductance element uses transformator T1, the primary side winding of described transformator be serially connected in described floatinglyly and between electrical switch Q1, described 3rd diode (D3) forward is serially connected between primary side winding and electrical switch (Q1) junction point and described input positive pole;Described transformer secondary winding one end connects described input ground, the other end is powered to described PWM control module.The other end of described transformator T1 vice-side winding connects the anode of the second diode D2, the negative electrode of the second diode is powered to described pwm chip U1 and connects the negative electrode of the first Zener diode (ZD1) and one end of the first resistance (R1) and one end of the second electric capacity (C2), the other end of the first resistance connects described input positive pole, and the other end of the second electric capacity connects described input ground.It is connected the first electric capacity C1 between described input positive pole with input ground.Input dc power can be filtered by C1.When output short-circuit, transformator T1 is in short-circuit condition for a long time, and U1, because can not get the feedback of T1, does not has power supply normally to work for U1, so Q1 can be constantly in cut-off state, with causing input and completely isolated between floating ground, power supply input is in Light Condition.When output short-circuit eliminates, U1 restarts, and controls Q1 by PWM switch drive, make to float with input produce pressure reduction, thus maintain the constant voltage of output to export.
Referring to Fig. 2, input positive pole also concatenates electric fuse F1, shields charging circuit.
Above example by way of example only, non-provides constraints.Any without departing from the application spirit and scope, and the equivalent modifications that it is carried out or change, it is intended to be limited solely by among claims hereof scope.

Claims (10)

1. the constant voltage charging circuit using floating ground formula, it is characterized in that, including: connect the input positive pole of DC source and input ground, the output cathode connecting set of cells and floating ground, the afterflow energy-storage module being connected between output cathode and floating ground, the inductance element being sequentially connected in series between floating and input ground and electrical switch (Q1), control the PWM control module of electrical switch break-make.
2. the constant voltage charging circuit using floating ground formula as claimed in claim 1, it is characterised in that also include: gather described output cathode voltage and feed back the voltage sample module of surveyed output voltage to PWM control module.
3. the constant voltage charging circuit using floating ground formula as claimed in claim 2, it is characterised in that concatenate current sampling module between described electrical switch with input ground, this current sampling module will be surveyed output current feedback to described PWM control module.
4. the constant voltage charging circuit using floating ground formula as claimed in claim 3, it is characterized in that, described afterflow energy-storage module includes: the 3rd diode (D3) that the 6th electric capacity (C6) that is connected in parallel between described input positive pole and described floating ground, the 7th electric capacity (C7), forward are serially connected between inductance element and electrical switch (Q1) junction point and described input positive pole.
5. the constant voltage charging circuit using floating ground formula as claimed in claim 4, it is characterised in that described PWM control module includes pwm chip (U1) and peripheral circuit thereof.
null6. the constant voltage charging circuit using floating ground formula as claimed in claim 5,It is characterized in that,Described voltage sample module has comparator (U2A) and three terminal regulator (U3),The 7th resistance (R7) and the 8th resistance (R8) is concatenated between described input positive pole and floating ground,The contact of the 7th resistance and the 8th resistance connects the inverting input of comparator,The 12nd resistance (R12) is concatenated between described input positive pole and floating ground、9th resistance (R9) and the tenth resistance (R10),The contact of the 9th resistance and the tenth resistance connects the input in the same direction of comparator,The contact of the 12nd resistance and the 9th resistance connects the negative electrode of three terminal regulator and controls pole,The negative electrode of three terminal regulator connects floating ground,The inverting input of comparator connects the outfan of comparator by the 6th resistance (R6) connected and the 5th electric capacity (C5),The outfan of comparator feeds back surveyed output voltage by the 5th resistance (R5) to pwm chip (U1).
7. the constant voltage charging circuit using floating ground formula as claimed in claim 6, it is characterized in that, described current sampling module includes: be serially connected in the 3rd resistance (R3) between described electrical switch (Q1) and input ground, the contact of the 3rd resistance and electrical switch is surveyed output electric current by the 4th resistance (R4) to pwm chip (U1) feedback, and the grounding leg of pwm chip connects input ground.
8. the constant voltage charging circuit using floating ground formula as claimed in claim 7, it is characterized in that, described inductance element uses transformator (T1), the primary side winding of described transformator be serially connected in described floatinglyly and between electrical switch (Q1), described 3rd diode (D3) forward is serially connected between primary side winding and electrical switch (Q1) junction point and described input positive pole;Described transformer secondary winding one end connects described input ground, the other end is powered to described PWM control module.
9. the constant voltage charging circuit using floating ground formula as claimed in claim 8, it is characterized in that, the other end of described transformator (T1) vice-side winding connects the anode of the second diode (D2), the negative electrode of the second diode is to described pwm chip (U1) power supply and connects the negative electrode of the first Zener diode (ZD1) and one end of the first resistance (R1) and one end of the second electric capacity (C2), the other end of the first resistance connects described input positive pole, and the other end of the second electric capacity connects described input ground.
10. the constant voltage charging circuit using floating ground formula as claimed in claim 9, it is characterised in that be connected the first electric capacity (C1) between described input positive pole with input ground.
CN201620043787.4U 2016-01-18 2016-01-18 Adopt constant voltage charge circuit that floats ground formula Withdrawn - After Issue CN205544356U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656116A (en) * 2016-01-18 2016-06-08 深圳市福瑞康电子有限公司 Constant-current charging circuit adopting floating ground mode
CN111665890A (en) * 2019-03-08 2020-09-15 深圳市必易微电子有限公司 Floating type constant voltage circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656116A (en) * 2016-01-18 2016-06-08 深圳市福瑞康电子有限公司 Constant-current charging circuit adopting floating ground mode
CN105656116B (en) * 2016-01-18 2018-11-30 深圳市福瑞康电子有限公司 A kind of constant-current charging circuit using floating ground formula
CN111665890A (en) * 2019-03-08 2020-09-15 深圳市必易微电子有限公司 Floating type constant voltage circuit

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Address after: 518000 New Lake Street, Guangming New District, Shenzhen City, Guangdong Province

Patentee after: SHENZHEN FRECOM ELECTRONICS CO., LTD.

Address before: 518000 Shenzhen Guangming New District, Guangdong Province, Fuchuan rich science and Technology Park

Patentee before: SHENZHEN FRECOM ELECTRONICS CO., LTD.

CP02 Change in the address of a patent holder
AV01 Patent right actively abandoned

Granted publication date: 20160831

Effective date of abandoning: 20181130

AV01 Patent right actively abandoned