CN109459709A - A kind of direct current feedback electronic load - Google Patents
A kind of direct current feedback electronic load Download PDFInfo
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- CN109459709A CN109459709A CN201811630136.5A CN201811630136A CN109459709A CN 109459709 A CN109459709 A CN 109459709A CN 201811630136 A CN201811630136 A CN 201811630136A CN 109459709 A CN109459709 A CN 109459709A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of direct current feedback electronic loads, including the synchronous driving DC/AC circuit of commercial power rectification circuit, power circuit, control loop, DC/DC booster circuit, multiplication of voltage direct current feedback circuit, alternating current and tested power supply；The present invention overcomes the defect of existing electronic load product, is a kind of for various power supplys, charger delivery test, the novel electric power electric device that can simulate various mobile phone chargings and resistance load characteristics；The step-less adjustment to institute's artifical resistance value is realized, and can be realized the regeneration of electric energy, is had many advantages, such as energy saving, excellent without High-frequency Interference, small in size, light-weight, saving installation space, experimental performance.
Description
Technical field
The invention belongs to electronic load technical fields, and in particular to a kind of direct current feedback electronic load.
Background technique
With the fast development of electronic technology, portable electronic product is more and more, and function is more and more stronger, and power consumption is also
It is bigger.Such as mobile phone, digital camera, DV, tablet computer and electric vehicle etc., it is longer in order to obtain to use the time, it can only increase
The charging time of the capacity of rechargeable battery, such electronic product is also just increasingly longer, unacceptable.Then all big enterprises
The rapid nitriding released one after another, to solve the problems, such as that the charging time is too long, since fast charge technology, the agreement of all big enterprises are each
It is not identical, it cannot mutually be compatible with, make troubles and financial burden and the wasting of resources to user, also to products such as charger, power supplys
Production, test, more stringent requirements are proposed for aging.Various power source products: such as regulated power supply, charger are both needed to before factory
Carry out load aging and test.Energy consumption electric discharge is carried out using resistance when traditional method, this method can consume a large amount of electricity
Can, the capacity of transmission & distribution point device on the other hand can be greatly increased, the heat for release of working together will increase the burden of air-conditioning, and current kilowatt
Electric energy feedback type electronic load below or blank, the energy saving space is huge, so exploitation electric energy feedback type electronic load has very much
It is necessary.
Summary of the invention
For above-mentioned deficiency in the prior art, direct current feedback electronic load provided by the invention, which solves, overcomes existing electricity
The defect of sub- product-laden provides a energy feedback type electronic load, is a kind of for various power supplys, charger factory examination
Novel electric power electric device test, that various mobile phone chargings and resistance load characteristics can be simulated.
In order to achieve the above object of the invention, the technical solution adopted by the present invention are as follows: a kind of direct current feedback electronic load, including
Commercial power rectification circuit, power circuit, control loop, DC/DC booster circuit, multiplication of voltage direct current feedback circuit and tested power supply；
The commercial power rectification circuit and power circuit are connect with urban distribution network, and the commercial power rectification circuit is also respectively and again
Straightening flows back to current feed circuit and connects with the input terminal of tested power supply；
The power circuit is connect with control loop and DC/DC booster circuit respectively；
The multiplication of voltage direct current feedback circuit is also connect with DC/DC booster circuit and control loop respectively, the DC/DC boosting
Circuit is connect with control loop；
The output end of the tested power supply is connect with control loop and DC/DC booster circuit respectively.
Further, the commercial power rectification circuit includes bridge rectifier U1 and capacitor Ca；
The input terminal of the bridge rectifier U1 is connect with urban distribution network, the first output end of the bridge rectifier U1 with
Capacitor CaAnode connection, the C of second output terminal and capacitoraCathode connection；The capacitor CaAnode and cathode also distinguish
It is connect with the power input of multiplication of voltage direct current feedback circuit and ground terminal.
Further, the power circuit includes transformer T0, bridge rectifier U2 and capacitor CbConnection；
The primary side winding of the transformer T0 is connect with urban distribution network, and the vice-side winding of the transformer T0 is whole by bridge-type
Flow device U2 and capacitor CbConnection, capacitor CbAnode also connect respectively with DC/DC booster circuit and the power input of control loop
It connects, capacitor CbCathode ground connection.
Further, the multiplication of voltage direct current feedback circuit includes transformer T1, relay JK1, relay JK2, relay
JK3, triode Q9, triode Q8 and triode Q7；
The transformer T1 include the first primary side winding, the second primary side winding, the first vice-side winding, the second vice-side winding and
Third vice-side winding；
One end of the first vice-side winding of the transformer T1 is connect with the second movable contact of relay JK1, the transformation
The other end of the first vice-side winding of device T1 respectively with one end of the second vice-side winding of transformer T1 and relay JK2 second
Movable contact connection, one end of the third vice-side winding of the transformer T1 are connect with the first movable contact of relay JK2, the change
The other end of the third vice-side winding of depressor T1 is connect with the anode of diode D6；
The first movable contact of the relay JK1 is connect with the stationary contact of relay JK2, the stationary contact of the relay JK1
Point is connect with the anode of diode D8；
The anode of the diode D6 is also connect with the cathode of diode D13, the diode D13 plus earth；
The anode of the diode D8 is also connect with the cathode of the first movable contact of relay JK3 and diode D14 respectively,
The stationary contact of the relay JK3 is connect with one end of one end of capacitor C12 and capacitor C14 respectively, the diode D8's
Cathode is connect with the cathode of other end diode D6 of capacitor C12 and one end of inductance L1 respectively, the other end difference of inductance L1
It connect with the anode of capacitor C17 and the positive of capacitor C18, the cathode of capacitor C17, the other end of capacitor C14, diode D14
The cathode of anode and capacitor C18 are grounded；
One end of second primary side winding of the other end and transformer T1 of the first primary side winding of the transformer T1 is connect；
The other end of the first primary side winding of the transformer T1 also respectively with the cathode of diode D15, diode D16
Cathode is connected with the cathode of diode D17；
The anode of the diode D17 is connect with one end of one end of resistance R20 and resistance R23 respectively, and resistance R20's is another
One end is connect with the base stage of triode Q8, and the other end of resistance R23 and the emitter of triode Q8 are grounded, the collection of triode Q8
The connection of the accessory power supply of electrode and 6.8C；
The anode of the diode D16 is connect with one end of one end of resistance R19 and resistance R22 respectively, and resistance R19's is another
One end is connect with the base stage of triode Q7, and the other end of resistance R22 and the emitter of triode Q7 are grounded, the collection of triode Q7
The connection of the accessory power supply of electrode and 9.1C；
The anode of the diode D15 is connect with one end of one end of resistance R18 and resistance R21 respectively, and resistance R18's is another
One end is connect with the base stage of triode Q9, and the other end of resistance R21 and the emitter of triode Q9 are grounded, the collection of triode Q9
The connection of the accessory power supply of electrode and 15C；
The input terminal of the relay JK1 is connect with the anode of the accessory power supply of 9.1C and diode D1 respectively, relay
The output end of JK1 is connect with the cathode of 12V power supply and diode D1 respectively；
The input terminal of the relay JK2 is connect with the anode of the accessory power supply of 15C and diode D2 respectively, relay
The output end of JK2 is connect with the cathode of 12V power supply and diode D2 respectively；
The input terminal of the relay JK3 is connect with the anode of the accessory power supply of 6.8C and diode D10 respectively, relay
The output end of JK3 is connect with the cathode of 12V power supply and diode D10 respectively；
One end of the first primary side winding of the transformer T1, the first primary side winding of transformer T1 the other end and transformation
The other end of the second primary side winding of device T1 is respectively as multiplication of voltage direct current feedback circuit first input end IN1, first input end IN2
With first input end IN3, and first input end IN1, the first output end IN2 and first input end IN3 with DC/DC booster circuit
Connection；
The anode of the capacitor C17 is as the capacitor in multiplication of voltage direct current feedback circuit output end OUT and commercial power rectification circuit
CaAnode connection
Further, the DC/DC booster circuit includes input filter sub-circuit and drive sub-circuits；
The signal output end OUT2 of the input filter circuit is connect with multiplication of voltage direct current the second input terminal of feedback circuit IN2,
Its signal input part connects a three hole connectors；
The drive sub-circuits include triode driving network, push-pull drive network and driving chip network；
The driving chip network drives network and push-pull drive to be connected to the network by triode；
The the first signal output end OUT1 and multiplication of voltage direct current feedback circuit first input end IN1 of the push-pull drive network connect
It connects；The second signal output end OUT3 of the push-pull drive network is connect with multiplication of voltage direct current feedback circuit third input terminal IN3.
Further, the triode driving network includes two triode Q3 and triode Q4；
The base stage of the triode Q3 is connect with the anode of driving chip network and diode D3 respectively, diode D3's
Cathode is connect with the emitter of triode Q3, and the base stage of the triode Q3 is also connect with ground resistance R12, the triode Q3
Emitter and push-pull driver circuit the first signal input part A connection, the grounded collector of the triode Q3；
The base stage of the triode Q4 is connect with the anode of driving chip network and diode D9 respectively, diode D9's
Cathode is connect with the emitter of triode Q4, and the base stage of the triode Q4 is also connect with ground resistance R11, the triode Q4
Emitter and push-pull driver circuit the B connection of second signal input terminal, the grounded collector of the triode Q4.
Further, the push-pull drive network includes capacitor C4 and capacitor C15；
First signal input part A of the one end of the capacitor C4 as push-pull drive network, respectively with the one of resistance R6
It holds, one end of capacitor C5 is connected with one end of resistance R7, the other end of the capacitor C4 and the respectively other end of resistance R6, two poles
The cathode of pipe D5 is connected with the grid of field-effect tube Q1, and the anode of the diode D5 connect and connects with the source electrode of field-effect tube Q1
The drain electrode on ground, the field-effect tube Q1 is connect with the drain electrode of field-effect tube Q2, the grid of the field-effect tube Q2 respectively with two poles
The cathode of pipe D4, the other end of resistance R7 are connected with the other end of capacitor C5, the source electrode and diode D4 of the field-effect tube Q2
Positive connect and ground；
Second signal input terminal B of the one end of the capacitor C15 as push-pull drive network, respectively with resistance R15's
One end, capacitor C16 one end connected with one end of resistance R16, the other end of the capacitor C15 is another with resistance R15's respectively
It holds, the cathode of diode D12 is connected with the grid of field-effect tube Q5, the source of the anode and field-effect tube Q5 of the diode D12
The drain electrode of pole connect and ground, the field-effect tube Q5 is connect with the drain electrode of field-effect tube Q6, the grid of the field-effect tube Q6
It is connect respectively with the other end of the cathode of diode D11, the other end of resistance R16 and capacitor C16, the source of the field-effect tube Q6
The positive connect and ground of pole and diode D11；
First signal output end OUT1 of the drain electrode of the field-effect tube Q2 as push-pull drive network；
Third signal output end OUT3 of the drain electrode of the field-effect tube Q6 as push-pull drive network.
Further, the driving chip network includes model chip IC1 and chip IC 2；
The end VCC, the end C1 and the end C2 of the chip IC 2 are connect with 18V power supply；
The enabled control terminal E2 of the chip IC 2 is connect with the base stage of triode Q3, the enabled control terminal of the chip IC 2
E1 is connect with the base stage of triode Q4；
The end GND of the chip IC 2 is grounded；
The end RT of the chip IC 2 is connect with ground resistance R10；
The end CT of the chip IC 2 is connect with ground capacity C13；
The end IN- of the chip IC 2 is connect with one end of ground resistance R8, one end of capacitor C11 and resistance R3 respectively；Electricity
The other end for holding C11 is connect with one end of capacitor C6, the other end of resistance R3 respectively with one end of resistance R4 and resistance R5 one
End connection；
The end PWN of the chip IC 2 is connect with the other end of capacitor C11；
The end-IN2 of the chip IC 2 is connect with the other end of the other end of capacitor C6 and resistance R4 respectively；
The end+IN2 of the chip IC 2 is connect with one end of the other end of resistance R5 and resistance R1 respectively；
The end DT of the chip IC 2 is connect with one end of one end of resistance R2 and capacitor C3 respectively；
The end CO of the chip IC 2 connects with one end of the 5V power end of chip IC 2, one end of resistance R4 and resistance R5 respectively
It connects；
The other end of the capacitor C6 is also connect with the first fixing end of adjustable resistance W1, and the second of the adjustable resistance W1
Fixing end is connect with its adjustable end；
The other end of the resistance R1 and the other end of resistance R2 connect and connect with the second fixing end of adjustable resistance W1
Ground；
The other end of the capacitor C3 is connect with one end of the input terminal of chip IC 1 and capacitor C1 respectively, the chip IC 1
Output end connect respectively with one end of capacitor C2 and 3.3V power supply, the ground terminal of the chip IC 1, the other end of capacitor C1 and
The other end of capacitor C2 is grounded；
The adjustable end of the adjustable resistance W1 is connect as the signal input part IN of DC/DC booster circuit with control loop.
Further, the control loop includes MCU controller, voltage sample and control sub-circuit and current sample and control
System circuit；
The MCU controller signal output as control loop the first signal output end and adjustable resistance W1 it is adjustable
End connection,
The voltage sample and control sub-circuit include resistance R17 and resistance R9, one end of the resistance R17 respectively with electricity
One end of resistance R9 is connected with the end IN+ of chip IC 2, the other end ground connection of the resistance R9；
The other end of the resistance R17 is as in the second signal output end and multiplication of voltage direct current feedback circuit of control loop
The anode connection of capacitor C17；
The current sample and control sub-circuit include resistance R13 and resistance R14, and the both ends of the resistance R14 are grounded,
One end of the resistance R13 is grounded, and the other end is connect with the end+IN2 of chip IC 1.
Further, main control chip the model STM32F051K8U6 or EG8010 of the MCU controller；
The model HT7533 of the chip IC 1；
The model TL494 of the chip IC 2.
The invention has the benefit that direct current feedback electronic load provided by the invention overcome existing electronic load product it
Defect provides a energy feedback type electronic load, is a kind of for various power supplys, charger delivery test, Neng Goumo
Intend the novel electric power electric device of various mobile phone chargings and resistance load characteristics.It can be realized to the stepless of institute's artifical resistance value
Adjust, and can be realized the regeneration of electric energy, have energy conservation, without High-frequency Interference, it is small in size, light-weight, save installation space,
The advantages that experimental performance is excellent.
Detailed description of the invention
Fig. 1 is direct current feedback electronic load structure chart in the present invention.
Fig. 2 is multiplication of voltage direct current feedback sub-circuit schematic diagram in the present invention.
Fig. 3 is the input filter sub-circuit schematic diagram in the present invention in DC/DC booster circuit.
Fig. 4 is the drive sub-circuits schematic diagram in the present invention in DC/DC booster circuit.
Fig. 5 is control loop circuit structure diagram in the present invention.
Fig. 6 is the direct current feedback electronic load structure chart with the synchronous driving DC/AC circuit of alternating current in the present invention.
Fig. 7 is the power source aging cabinet signal being made up of in embodiment provided by the invention direct current feedback electronic load
Figure.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair
It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the column of protection.
As shown in Figure 1, a kind of direct current feedback electronic load, including commercial power rectification circuit, power circuit, control loop, DC/
DC booster circuit, multiplication of voltage direct current feedback circuit and tested power supply；
Commercial power rectification circuit and power circuit are connect with urban distribution network, and commercial power rectification circuit is also returned with multiplication of voltage direct current respectively
Current feed circuit is connected with the input terminal of tested power supply；
Power circuit is connect with control loop and DC/DC booster circuit respectively；
Multiplication of voltage direct current feedback circuit is also connect with DC/DC booster circuit and control loop respectively, DC/DC booster circuit and control
Loop connection processed；
The output end of tested power supply is connect with control loop and DC/DC booster circuit respectively.
Wherein, commercial power rectification circuit includes bridge rectifier U1 and capacitor Ca；The input terminal of bridge rectifier U1 and city
Power grid connection, the first output end and capacitor C of bridge rectifier U1aAnode connection, the C of second output terminal and capacitoraIt is negative
Pole connection；Capacitor CaAnode and cathode also connect respectively with the power input of multiplication of voltage direct current feedback circuit and ground terminal.
Power circuit includes transformer T0, bridge rectifier U2 and capacitor CbConnection；The primary side winding of transformer T0 and city
The vice-side winding of utility grid connection, transformer T0 passes through bridge rectifier U2 and capacitor CbConnection, capacitor CbAnode also respectively with
DC/DC booster circuit is connected with the power input of control loop, capacitor CbCathode ground connection.
As shown in Fig. 2, multiplication of voltage direct current feedback circuit include transformer T1, relay JK1, relay JK2, relay JK3,
Triode Q9, triode Q8 and triode Q7；
Transformer T1 includes the first primary side winding, the second primary side winding, the first vice-side winding, the second vice-side winding and third
Vice-side winding；
One end of the first vice-side winding of transformer T1 is connect with the second movable contact of relay JK1, and the of transformer T1
The other end of one vice-side winding connects with the second movable contact of one end of the second vice-side winding of transformer T1 and relay JK2 respectively
It connects, one end of the third vice-side winding of transformer T1 is connect with the first movable contact of relay JK2, the third pair side of transformer T1
The other end of winding is connect with the anode of diode D6；
The first movable contact of relay JK1 is connect with the stationary contact of relay JK2, the stationary contact of relay JK1 and two poles
The anode connection of pipe D8；
The anode of diode D6 is also connect with the cathode of diode D13, diode D13 plus earth；
The anode of diode D8 is also connect with the cathode of the first movable contact of relay JK3 and diode D14 respectively, relay
The stationary contact of device JK3 is connect with one end of one end of capacitor C12 and capacitor C14 respectively, the cathode of diode D8 respectively with electricity
Hold C12 the other end connected with the cathode of diode D6 with one end of inductance L1, the other end of inductance L1 respectively with capacitor C17
Anode and capacitor C18 anode connection, the cathode of capacitor C17, the other end of capacitor C14, diode D14 anode and capacitor
The cathode of C18 is grounded；
One end of second primary side winding of the other end and transformer T1 of the first primary side winding of transformer T1 is connect；
The other end of the first primary side winding of the transformer T1 also cathode with the cathode of diode D15, diode D16 respectively
It is connected with the cathode of diode D17；
The anode of diode D17 is connect with one end of one end of resistance R20 and resistance R23 respectively, the other end of resistance R20
It is connect with the base stage of triode Q8, the other end of resistance R23 and the emitter of triode Q8 are grounded, the collector of triode Q8
It is connect with the accessory power supply of 6.8C；
The anode of diode D16 is connect with one end of one end of resistance R19 and resistance R22 respectively, the other end of resistance R19
It is connect with the base stage of triode Q7, the other end of resistance R22 and the emitter of triode Q7 are grounded, the collector of triode Q7
It is connect with the accessory power supply of 9.1C；
The anode of diode D15 is connect with one end of one end of resistance R18 and resistance R21 respectively, the other end of resistance R18
It is connect with the base stage of triode Q9, the other end of resistance R21 and the emitter of triode Q9 are grounded, the collector of triode Q9
It is connect with the accessory power supply of 15C；
The input terminal of relay JK1 is connect with the anode of the accessory power supply of 9.1C and diode D1 respectively, relay JK1's
Output end is connect with the cathode of 12V power supply and diode D1 respectively；
The input terminal of relay JK2 is connect with the anode of the accessory power supply of 15C and diode D2 respectively, relay JK2's
Output end is connect with the cathode of 12V power supply and diode D2 respectively；
The input terminal of relay JK3 is connect with the anode of the accessory power supply of 6.8C and diode D10 respectively, relay JK3
Output end connect respectively with the cathode of 12V power supply and diode D10；
One end of the first primary side winding of transformer T1, the first primary side winding of transformer T1 the other end and transformer T1
The second primary side winding the other end respectively as multiplication of voltage direct current feedback circuit first input end IN1, first input end IN2 and
One input terminal IN3, and first input end IN1, the first output end IN2 and first input end IN3 connect with DC/DC booster circuit
It connects；
The anode of capacitor C17 is as the capacitor C in multiplication of voltage direct current feedback circuit output end OUT and commercial power rectification circuita's
Anode connection
Above-mentioned DC/DC booster circuit includes input filter sub-circuit and drive sub-circuits；
As shown in figure 3, the signal output end OUT2 of input filter sub-circuit and the second input terminal of multiplication of voltage direct current feedback circuit
IN2 connection, signal input part connect a three hole connectors；
As shown in figure 4, drive sub-circuits include triode driving network, push-pull drive network and driving chip network；
Driving chip network drives network and push-pull drive to be connected to the network by triode；
First signal output end OUT1 of push-pull drive network is connect with multiplication of voltage direct current feedback circuit first input end IN1；
The second signal output end OUT3 of push-pull drive network is connect with multiplication of voltage direct current feedback circuit third input terminal IN3.
Above-mentioned triode driving network includes two triode Q3 and triode Q4；
The base stage of triode Q3 is connect with the anode of driving chip network and diode D3 respectively, the cathode of diode D3
Connect with the emitter of triode Q3, the base stage of triode Q3 also with ground resistance R12 electrode, the emitter of triode Q3 with push away
Draw the first signal input part A connection of driving circuit, the grounded collector of triode Q3；
The base stage of triode Q4 is connect with the anode of driving chip network and diode D9 respectively, the cathode of diode D9
Connect with the emitter of triode Q4, the base stage of triode Q4 is also connect with ground resistance R11, the emitter of triode Q4 with push away
Draw the second signal input terminal B connection of driving circuit, the grounded collector of triode Q4.
Above-mentioned push-pull drive network includes capacitor C4 and capacitor C15；
First signal input part A of the one end of capacitor C4 as push-pull drive network, respectively with one end of resistance R6, electricity
The one end for holding C5 connect with one end of resistance R7, and the other end of capacitor C4 and the respectively other end of resistance R6, diode D5 are born
Pole is connected with the grid of field-effect tube Q1, the source electrode connect and ground of the anode and field-effect tube Q1 of diode D5, field-effect tube
The drain electrode of Q1 is connect with the drain electrode of field-effect tube Q2, the grid of field-effect tube Q2 respectively with the cathode of diode D4, resistance R7
The other end is connected with the other end of capacitor C5, the source electrode of field-effect tube Q2 and the positive connect and ground of diode D4；
Second signal input terminal B of the one end of capacitor C15 as push-pull drive network, respectively with one end of resistance R15,
One end of capacitor C16 is connected with one end of resistance R16, the other end of capacitor C15 and the respectively other end, the diode of resistance R15
The cathode of D12 is connected with the grid of field-effect tube Q5, the source electrode connect and ground of the anode and field-effect tube Q5 of diode D12,
The drain electrode of field-effect tube Q5 is connect with the drain electrode of field-effect tube Q6, the grid of field-effect tube Q6 respectively with the cathode of diode D11,
The other end of resistance R16 is connected with the other end of capacitor C16, and the source electrode of field-effect tube Q6 is connect simultaneously with the anode of diode D11
Ground connection；
First signal output end OUT1 of the drain electrode of field-effect tube Q2 as push-pull drive network；
Third signal output end OUT3 of the drain electrode of field-effect tube Q6 as push-pull drive network.
Above-mentioned driving chip network includes model chip IC1 and chip IC 2；
The end VCC, the end C1 and the end C2 of chip IC 2 are connect with 18V power supply；
The enabled control terminal E2 of chip IC 2 is connect with the base stage of triode Q3, the enabled control terminal E1 of chip IC 2 and three poles
The base stage of pipe Q4 connects；
The end GND of chip IC 2 is grounded；
The end RT of chip IC 2 is connect with ground resistance R10；
The end CT of chip IC 2 is connect with ground capacity C13；
The end IN- of chip IC 2 is connect with one end of ground resistance R8, one end of capacitor C11 and resistance R3 respectively；Capacitor
The other end of C11 is connect with one end of capacitor C6, the other end of resistance R3 one end with one end of resistance R4 and resistance R5 respectively
Connection；
The end PWN of chip IC 2 is connect with the other end of capacitor C11；
The end-IN2 of chip IC 2 is connect with the other end of the other end of capacitor C6 and resistance R4 respectively；
The end+IN2 of chip IC 2 is connect with one end of the other end of resistance R5 and resistance R1 respectively；
The end DT of chip IC 2 is connect with one end of one end of resistance R2 and capacitor C3 respectively；
The end CO of chip IC 2 is connect with one end of the 5V power end of chip IC 2, one end of resistance R4 and resistance R5 respectively；
The other end of capacitor C6 is also connect with the first fixing end of adjustable resistance W1, the second fixing end of adjustable resistance W1 with
End connection that its is adjustable；
The other end of the other end of resistance R1 and resistance R2 with the second fixing end connect and ground of adjustable resistance W1；
The other end of capacitor C3 is connect with one end of the input terminal of chip IC 1 and capacitor C1 respectively, the output end of chip IC 1
Connect respectively with one end of capacitor C2 and 3.3V power supply, the ground terminal of chip IC 1, the other end of capacitor C1 and capacitor C2 it is another
End is grounded；
The adjustable end of adjustable resistance W1 is connect as the signal input part IN of DC/DC booster circuit with control loop.
As shown in figure 5, control loop includes MCU controller, voltage sample and control sub-circuit and current sample and control
Sub-circuit；
MCU controller signal output connects as the first signal output end of control loop and the adjustable end of adjustable resistance W1
It connects,
Voltage sample and control sub-circuit include resistance R17 and resistance R9, one end of resistance R17 respectively with resistance R9 one
End is connected with the end IN+ of chip IC 2, the other end ground connection of resistance R9；
The other end of resistance R17 is as the capacitor in the second signal output end and multiplication of voltage direct current feedback circuit of control loop
The anode connection of C17；
Current sample and control sub-circuit include resistance R13 and resistance R14, and the both ends of resistance R14 are grounded, resistance R13
One end ground connection, the other end connect with the end+IN2 of chip IC 1.
Main control chip the model STM32F051K8U6 or EG8010 of above-mentioned MCU controller；The model of chip IC 1
HT7533；The model TL494 of chip IC 2.It include a set of charge protocol simulation softward in the MCU controller, for simulating
Various chargings.
In one embodiment of the invention, it additionally provides a kind of as shown in FIG. 6 with the synchronous driving DC/AC electricity of alternating current
The direct current feedback electronic load of the direct current feedback electronic load on road, the structure can drive the voltage after raising by alternating current is synchronous
DC/AC circuit conversion supplies tested power supply at alternating current or feeds back to urban distribution network.
In one embodiment of the invention, provide the course of work of the device: commercial power rectification circuit is by urban distribution network
In commercial power rectification at direct current, power circuit alternating current is depressured and be rectified into direct current be DC/DC booster circuit and control ring
Road power supply, control loop are connect with tested power supply, control the size of current sucked from tested power supply, DC/DC boosting electricity
The voltage that tested power supply 9 exports is increased to the 5~15% of commercial power rectification voltage and is fed back to by road and multiplication of voltage direct current feedback circuit
The output end of commercial power rectification circuit supplies tested power supply (as shown in Figure 1), or again will by the synchronous driving DC/AC circuit of alternating current
The DC voltage is converted into alternating current and supplies tested power supply or feed back in urban power (as shown in Figure 6).
In one embodiment of the invention, DC/DC booster circuit and multiplication of voltage direct current in invention electronic load is provided to return
The circuit operation principle of current feed circuit:
DC/DC booster circuit sucks electric current from tested power supply, and the pwm signal that the size of electric current is generated by MCU is from IN
Mouth control, or brought the voltage up by adjusting W1 realization.Tested power supply output is in 5V or less, in order to reach the mesh of feedback
, only it is not achieved by DC/DC boosting；When tested power supply is exported in 10V or more, DC/DC boosting again can be excessively high, so
Circuit is adjusted with 3 triodes and three relay composition boosting multiples, is tested power supply output in 8.2V or less, transformation
Device vice-side winding boosts through relay two voltage-multiplying circuits that all series connection is formed through D6, D13 and C12, C14 again；Tested power supply
In 8.2V or more, 12V or less, Q8 is connected JK3 and disconnects two voltage-multiplying circuits for output, and transformer secondary winding is all gone here and there through relay
Bridge rectifier of the connection again through D6, D13, D8, D14 composition exports；Tested power supply is exported in 12V or more, 18V or less,
Q8 is connected JK3 and disconnects two voltage-multiplying circuits and Q7 conducting JK1 disconnection one winding of transformer secondary, and other vice-side windings are through relay
All bridge rectifier of the series connection again through D6, D13, D8, D14 composition exports device；Tested power supply output is led in 18V or more Q8
Logical JK3 disconnects two voltage-multiplying circuits and Q7 conducting JK1 disconnects one winding of transformer secondary, and Q9 is connected JK2 and disconnects transformer secondary
Another winding, the bridge rectifier output that only a vice-side winding is formed through relay through D6, D13, D8, D14.
In one embodiment of the invention, a kind of electricity of direct current feedback load composition as shown in Figure 7 is additionally provided
Source aging cabinet, the power source aging cabinet include a computer and several direct current feedback electronic loads, several direct current feedback electricity
Son load is sequentially connected, and the other end of the last one direct current feedback electronic load is connect with computer, for testing all kinds of electricity
Product-derived improves its reliability.
The invention has the benefit that direct current feedback electronic load provided by the invention overcome existing electronic load product it
Defect provides a energy feedback type electronic load, is a kind of for various power supplys, charger delivery test, Neng Goumo
Intend the novel electric power electric device of various mobile phone chargings and resistance load characteristics.It can be realized to the stepless of institute's artifical resistance value
Adjust, and can be realized the regeneration of electric energy, have energy conservation, without High-frequency Interference, it is small in size, light-weight, save installation space,
The advantages that experimental performance is excellent.
Claims (10)
1. a kind of direct current feedback electronic load, which is characterized in that including commercial power rectification circuit, power circuit, control loop, DC/
DC booster circuit, multiplication of voltage direct current feedback circuit and tested power supply；
The commercial power rectification circuit and power circuit are connect with urban distribution network, the commercial power rectification circuit also respectively with straightening again
Current feed circuit is flowed back to connect with the input terminal of tested power supply；
The power circuit is connect with control loop and DC/DC booster circuit respectively；
The multiplication of voltage direct current feedback circuit is also connect with DC/DC booster circuit and control loop respectively, the DC/DC booster circuit
It is connect with control loop；
The output end of the tested power supply is connect with control loop and DC/DC booster circuit respectively.
2. direct current feedback electronic load according to claim 1, which is characterized in that the commercial power rectification circuit includes bridge-type
Rectifier U1 and capacitor Ca；
The input terminal of the bridge rectifier U1 is connect with urban distribution network, the first output end and capacitor of the bridge rectifier U1
CaAnode connection, the C of second output terminal and capacitoraCathode connection；The capacitor CaAnode and cathode also respectively and again
Straightening flows back to power input and the ground terminal connection of current feed circuit.
3. direct current feedback electronic load according to claim 1, which is characterized in that the power circuit includes transformer
T0, bridge rectifier U2 and capacitor CbConnection；
The primary side winding of the transformer T0 is connect with urban distribution network, and the vice-side winding of the transformer T0 passes through bridge rectifier
U2 and capacitor CbConnection, capacitor CbAnode also connect respectively with the power input of DC/DC booster circuit and control loop, it is electric
Hold CbCathode ground connection.
4. direct current feedback electronic load according to claim 1, which is characterized in that the multiplication of voltage direct current feedback circuit includes
Transformer T1, relay JK1, relay JK2, relay JK3, triode Q9, triode Q8 and triode Q7；
The transformer T1 includes the first primary side winding, the second primary side winding, the first vice-side winding, the second vice-side winding and third
Vice-side winding；
One end of the first vice-side winding of the transformer T1 is connect with the second movable contact of relay JK1, the transformer T1
The first vice-side winding the other end the second dynamic touching with one end of the second vice-side winding of transformer T1 and relay JK2 respectively
Point connection, one end of the third vice-side winding of the transformer T1 are connect with the first movable contact of relay JK2, the transformer
The other end of the third vice-side winding of T1 is connect with the anode of diode D6；
The first movable contact of the relay JK1 is connect with the stationary contact of relay JK2, the stationary contact of the relay JK1 with
The anode connection of diode D8；
The anode of the diode D6 is also connect with the cathode of diode D13, the diode D13 plus earth；
The anode of the diode D8 is also connect with the cathode of the first movable contact of relay JK3 and diode D14 respectively, described
The stationary contact of relay JK3 is connect with one end of one end of capacitor C12 and capacitor C14 respectively, the cathode of the diode D8
Connect respectively with the cathode of other end diode D6 of capacitor C12 and one end of inductance L1, the other end of inductance L1 respectively with electricity
Hold C17 anode and capacitor C18 anode connection, the cathode of capacitor C17, the other end of capacitor C14, diode D14 anode
It is grounded with the cathode of capacitor C18；
One end of second primary side winding of the other end and transformer T1 of the first primary side winding of the transformer T1 is connect；
The other end of the first primary side winding of the transformer T1 also cathode with the cathode of diode D15, diode D16 respectively
It is connected with the cathode of diode D17；
The anode of the diode D17 is connect with one end of one end of resistance R20 and resistance R23 respectively, the other end of resistance R20
It is connect with the base stage of triode Q8, the other end of resistance R23 and the emitter of triode Q8 are grounded, the collector of triode Q8
It is connect with the accessory power supply of 6.8C；
The anode of the diode D16 is connect with one end of one end of resistance R19 and resistance R22 respectively, the other end of resistance R19
It is connect with the base stage of triode Q7, the other end of resistance R22 and the emitter of triode Q7 are grounded, the collector of triode Q7
It is connect with the accessory power supply of 9.1C；
The anode of the diode D15 is connect with one end of one end of resistance R18 and resistance R21 respectively, the other end of resistance R18
It is connect with the base stage of triode Q9, the other end of resistance R21 and the emitter of triode Q9 are grounded, the collector of triode Q9
It is connect with the accessory power supply of 15C；
The input terminal of the relay JK1 is connect with the anode of the accessory power supply of 9.1C and diode D1 respectively, relay JK1's
Output end is connect with the cathode of 12V power supply and diode D1 respectively；
The input terminal of the relay JK2 is connect with the anode of the accessory power supply of 15C and diode D2 respectively, relay JK2's
Output end is connect with the cathode of 12V power supply and diode D2 respectively；
The input terminal of the relay JK3 is connect with the anode of the accessory power supply of 6.8C and diode D10 respectively, relay JK3
Output end connect respectively with the cathode of 12V power supply and diode D10；
One end of the first primary side winding of the transformer T1, the first primary side winding of transformer T1 the other end and transformer T1
The second primary side winding the other end respectively as multiplication of voltage direct current feedback circuit first input end IN1, first input end IN2 and
One input terminal IN3, and first input end IN1, the first output end IN2 and first input end IN3 connect with DC/DC booster circuit
It connects；
The anode of the capacitor C17 is as the capacitor C in multiplication of voltage direct current feedback circuit output end OUT and commercial power rectification circuitaJust
Pole connection.
5. direct current feedback electronic load according to claim 4, which is characterized in that the DC/DC booster circuit includes defeated
Enter to filter sub-circuit and drive sub-circuits；
The signal output end OUT2 of the input filter sub-circuit is connect with multiplication of voltage direct current the second input terminal of feedback circuit IN2,
Signal input part connects a three hole connectors；
The drive sub-circuits include triode driving network, push-pull drive network and driving chip network；
The driving chip network drives network and push-pull drive to be connected to the network by triode；
First signal output end OUT1 of the push-pull drive network is connect with multiplication of voltage direct current feedback circuit first input end IN1；
The second signal output end OUT3 of the push-pull drive network is connect with multiplication of voltage direct current feedback circuit third input terminal IN3.
6. direct current feedback electronic load according to claim 5, which is characterized in that the triode driving network includes two
A triode Q3 and triode Q4；
The base stage of the triode Q3 is connect with the anode of driving chip network and diode D3 respectively, the cathode of diode D3
It is connect with the emitter of triode Q3, the base stage of the triode Q3 is also connect with ground resistance R12, the hair of the triode Q3
First signal input part A connection of emitter-base bandgap grading and push-pull driver circuit, the grounded collector of the triode Q3；
The base stage of the triode Q4 is connect with the anode of driving chip network and diode D9 respectively, the cathode of diode D9
It is connect with the emitter of triode Q4, the base stage of the triode Q4 is also connect with ground resistance R11, the hair of the triode Q4
The second signal input terminal B connection of emitter-base bandgap grading and push-pull driver circuit, the grounded collector of the triode Q4.
7. direct current feedback electronic load according to claim 6, which is characterized in that the push-pull drive network includes capacitor
C4 and capacitor C15；
First signal input part A of the one end of the capacitor C4 as push-pull drive network, respectively with one end of resistance R6, electricity
The one end for holding C5 is connected with one end of resistance R7, the other end of the capacitor C4 and the respectively other end, the diode D5 of resistance R6
Cathode connected with the grid of field-effect tube Q1, anode and the source electrode connect and ground of field-effect tube Q1 of the diode D5,
The drain electrode of the field-effect tube Q1 is connect with the drain electrode of field-effect tube Q2, the grid of the field-effect tube Q2 respectively with diode D4
Cathode, resistance R7 the other end connected with the other end of capacitor C5, the source electrode of the field-effect tube Q2 and diode D4 are just
Pole connect and ground；
Second signal input terminal B of the one end of the capacitor C15 as push-pull drive network, respectively with one end of resistance R15,
One end of capacitor C16 is connected with one end of resistance R16, the other end of the capacitor C15 and the respectively other end of resistance R15, two
The cathode of pole pipe D12 is connected with the grid of field-effect tube Q5, and the anode of the diode D12 is connect with the source electrode of field-effect tube Q5
And be grounded, the drain electrode of the field-effect tube Q5 is connect with the drain electrode of field-effect tube Q6, the grid of the field-effect tube Q6 respectively with
The cathode of diode D11, the other end of resistance R16 are connected with the other end of capacitor C16, the source electrode and two of the field-effect tube Q6
The positive connect and ground of pole pipe D11；
First signal output end OUT1 of the drain electrode of the field-effect tube Q2 as push-pull drive network；
Third signal output end OUT3 of the drain electrode of the field-effect tube Q6 as push-pull drive network.
8. direct current feedback electronic load according to claim 6, which is characterized in that the driving chip network includes model
Chip IC 1 and chip IC 2；
The end VCC, the end C1 and the end C2 of the chip IC 2 are connect with 18V power supply；
The enabled control terminal E2 of the chip IC 2 is connect with the base stage of triode Q3, the enabled control terminal E1 of the chip IC 2 with
The base stage of triode Q4 connects；
The end GND of the chip IC 2 is grounded；
The end RT of the chip IC 2 is connect with ground resistance R10；
The end CT of the chip IC 2 is connect with ground capacity C13；
The end IN- of the chip IC 2 is connect with one end of ground resistance R8, one end of capacitor C11 and resistance R3 respectively；Capacitor
The other end of C11 is connect with one end of capacitor C6, the other end of resistance R3 one end with one end of resistance R4 and resistance R5 respectively
Connection；
The end PWM of the chip IC 2 is connect with the other end of capacitor C11；
The end-IN2 of the chip IC 2 is connect with the other end of the other end of capacitor C6 and resistance R4 respectively；
The end+IN2 of the chip IC 2 is connect with one end of the other end of resistance R5 and resistance R1 respectively；
The end DT of the chip IC 2 is connect with one end of one end of resistance R2 and capacitor C3 respectively；
The end CO of the chip IC 2 is connect with one end of the 5V power end of chip IC 2, one end of resistance R4 and resistance R5 respectively；
The other end of the capacitor C6 is also connect with the first fixing end of adjustable resistance W1, and the second of the adjustable resistance W1 is fixed
End is connect with its adjustable end；
The other end of the other end of the resistance R1 and resistance R2 with the second fixing end connect and ground of adjustable resistance W1；
The other end of the capacitor C3 is connect with one end of the input terminal of chip IC 1 and capacitor C1 respectively, the chip IC 1 it is defeated
Outlet is connect with one end of capacitor C2 and 3.3V power supply respectively, the other end and capacitor of the ground terminal of the chip IC 1, capacitor C1
The other end of C2 is grounded；
The adjustable end of the adjustable resistance W1 is connect as the signal input part IN of DC/DC booster circuit with control loop.
9. direct current feedback electronic load according to claim 8, which is characterized in that the control loop includes MCU control
Device, voltage sample and control sub-circuit and current sample and control sub-circuit；
The MCU controller signal output connects as the first signal output end of control loop and the adjustable end of adjustable resistance W1
It connects,
The voltage sample and control sub-circuit include resistance R17 and resistance R9, one end of the resistance R17 respectively with resistance R9
One end connected with the end IN+ of chip IC 2, the other end of resistance R9 ground connection；
The other end of the resistance R17 is as the capacitor in the second signal output end and multiplication of voltage direct current feedback circuit of control loop
The anode connection of C17；
The current sample and control sub-circuit include resistance R13 and resistance R14, and the both ends of the resistance R14 are grounded, described
One end of resistance R13 is grounded, and the other end is connect with the end+IN2 of chip IC 1.
10. direct current feedback electronic load according to claim 9, which is characterized in that the main control chip of the MCU controller
Model STM32F051K8U6 or EG8010；
The model HT7533 of the chip IC 1；
The model TL494 of the chip IC 2.
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| CN201811630136.5A CN109459709A (en) | 2018-12-29 | 2018-12-29 | A kind of direct current feedback electronic load |
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