CN216904694U

CN216904694U - High-power simulation battery

Info

Publication number: CN216904694U
Application number: CN202220580899.9U
Authority: CN
Inventors: 诸葛骏
Original assignee: Shenzhen Asundar Electronic Co ltd
Current assignee: Shenzhen Angshengda Electronics Co.,Ltd.
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-07-05
Anticipated expiration: 2032-03-16

Abstract

The utility model relates to the technical field of analog batteries, and aims to solve the technical problem that the conventional analog battery cannot meet the test requirement of a high-capacity battery. When the output synchronous following unit adjusts or fixes the voltage to work along with the pressure difference of the adjusting tube in the power output unit, the output synchronous following unit is always maintained at the fixed voltage, the power consumption of the power adjusting tube is reduced, the heat productivity is reduced, the working stability of a high-power simulation battery system is improved, and the test requirement of the current battery capacity increase is met.

Description

High-power simulation battery

Technical Field

The utility model relates to the technical field of analog batteries, in particular to a high-power analog battery.

Background

Along with the continuous enhancement of the functions of the smart phone, the battery capacity of the smart phone is increased step by step; the popularization of rapid charging provides a very convenient means for charging the increasingly larger battery capacity; the scale of the energy storage machine is continuously increased, particularly the proportion of novel energy storage is increased, and the capacity demand of the battery is increased along with the increase of the proportion of the novel energy storage. The continuously increasing battery capacity provides convenience for various electronic products, and simultaneously brings about not less challenges for the research and development of products and the production line test.

The power of the analog battery is increased, the power consumption is also increased, the output of the analog battery is unstable, and the analog battery cannot stably work at a fixed voltage, so that the power of the conventional analog battery is limited, the current and the power cannot meet the test requirement of the current battery capacity increase, and the current test requirement of the battery capacity increase cannot be met. In addition, the power of the analog battery is increased, and the analog battery is inconvenient to carry along with the increase of the volume and the mass.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a high-power simulation battery to solve the technical problem that the conventional simulation battery cannot meet the test requirement of a high-capacity battery.

In order to achieve the purpose, the specific technical scheme of the high-power analog battery is as follows:

the utility model provides a high-power analog battery, is including the power output unit that is used for exporting terminal direct current, still includes the synchronous following unit of output that is used for exporting the third direct current, and power output unit includes power output circuit, and power output circuit's power input end is connected with the power output end of the synchronous following unit of output, and power output circuit is equipped with the discharge power adjusting tube, and the synchronous following unit of output carries out dynamic adjustment according to the pressure difference signal between the input of discharge power adjusting tube and output and exports the third direct current. When the output synchronous following unit adjusts or fixes the voltage to work along with the pressure difference of the adjusting tube in the power output unit, the output synchronous following unit is always maintained at the fixed voltage, the power consumption of the power adjusting tube is reduced, the heat productivity is reduced, the working stability of a high-power simulation battery system is improved, and the test requirement of the current battery capacity increase is met. The reduction of calorific capacity has then reduced the volume and the quality of high-power simulation battery itself, makes high-power simulation battery light more, portable.

Further, an optical coupling control circuit for feeding back a differential pressure signal is arranged between the power output unit and the output synchronous following unit. Electric isolation is realized through the optical coupler, and mutual influence between the two units is avoided.

Further, the output synchronous following unit comprises an LCC circuit for power conversion and a resonance controller for providing a voltage driving signal for the LCC circuit, the optical coupling control circuit feeds back a voltage difference signal to the resonance controller, and the LCC circuit outputs a third direct current to the power output unit. The LCC circuit is an adjustable switch power supply, and compared with a linear power supply, the size of a high-power instrument can be further reduced, and the mass of the instrument can be lightened.

Further, the output synchronous following unit further comprises a voltage current feedback circuit for feeding back a parameter of the third direct current to the resonance controller.

Further, the LCC circuit includes a transformer, a synchronous rectification controller, and a switching tube Q13 and a switching tube Q14 controlled by the same-frequency rectification controller, a primary side of the transformer is used for inputting a voltage driving signal, a secondary side of the transformer is provided with a center tap for outputting a third direct current, two ends of the secondary side are respectively connected with a first switching end of the switching tube Q13 and a first switching end of the switching tube Q14, second switching ends of the switching tube Q13 and the switching tube Q14 are respectively connected with the synchronous rectification controller, and controlled ends of the switching tube Q13 and the switching tube Q14 are respectively connected with the synchronous rectification controller.

Further, the LCC circuit further includes a primary side current sampling circuit for feeding back the primary side current to the resonant controller.

Further, the discharge power adjusting tube comprises a switch tube Q15 and a switch tube Q16 controlled by the switch tube Q15, a controlled end of the switch tube Q16 is connected with an output end of a comparator U6, a non-inverting input end of the comparator U6 is connected with a second switch end of the switch tube Q15, a reference voltage is provided at an inverting input end of the comparator U6, a third direct current is input to the first switch ends of the switch tube Q15 and the switch tube Q16, the second switch ends of the switch tube Q15 and the switch tube Q16 are used for outputting a tail-end direct current, and the discharge power adjusting tube is a linear adjusting power tube. During discharging, the switching tube Q15 is firstly conducted, and the switching tube Q16 is then conducted, so that current impact caused by simultaneous conduction is avoided by time delay; the switch tube Q15 and the switch tube Q16 are power tubes with linear adjustment, and output voltage quality is improved.

Furthermore, the power output unit also comprises a charging power adjusting tube used for load testing, and a current detection resistor, a current gear switching switch and an output protection switch are also connected in series on an output line of the power output circuit.

Further, the voltage gear shifting circuit is used for obtaining third direct current from the power output unit and feeding the third direct current back to the output synchronous following unit through the comparator U10 and the optical coupler Q33. The non-inverting input end of the comparator U10 obtains partial voltage from a third direct current (VCC3) through a resistor voltage-dividing circuit, the inverting input end of the comparator U10 is provided with reference voltage, the output end of the comparator U10 is connected with the anode of the optocoupler Q33 through a resistor R51, the cathode of the optocoupler Q33 is connected with the ground, the collector of the optocoupler Q33 is connected with the resonance control of the output synchronous following unit, and the emitter of the optocoupler Q33 is connected with the ground.

Further, the power factor correction circuit comprises a power factor correction unit for providing a first direct current voltage to the output synchronous following unit, wherein the power factor correction unit is provided with a PFC module, the PFC module comprises a first common-mode inductor connected with a mains supply, a second common-mode inductor connected with the first common-mode inductor, and a rectification module connected with the second common-mode inductor, the positive electrode of the rectification module is connected with the input end of a coil L1A, the output end of the coil L1A is connected with the first switch end of a switch tube Q1, the second switch end of the switch tube Q1 is grounded, the controlled end of the switch tube Q1 is connected with the drive end of the power factor controller, the output end of the coil L1A is grounded through a capacitor C1, and the switch tube Q1, the coil L1A, the capacitor C1 and the power factor controller form a power factor correction circuit; a thermistor is connected in series in an alternating current circuit at the front stage of the rectifier module, the thermistor is connected in parallel with a relay, a switch tube Q2 used for controlling the opening and closing of the relay is further arranged, the switch tube Q2 is connected with a first voltage feedback circuit used for controlling the on and off of the switch tube Q, and the first voltage feedback circuit is used for sampling a first direct current. The power factor is improved, the reactive current is reduced, and the power efficiency is improved.

The high-power simulation battery provided by the utility model has the following advantages:

the voltage and current feedback signals of the output end are transmitted to the feedback end of the resonance controller through the optical coupling control circuit, so that the voltage and current output of the power supply is controlled; the output voltage signal of the power output unit is input to the optical coupling control circuit to control the voltage of the output synchronous following unit to follow the output voltage of the whole high-power analog battery. The front-stage power supply adopts an adjustable LCC switching power supply, so that the volume of a high-power instrument can be reduced in a large range, and the mass of the instrument can be reduced; the adjustable voltage range of the output of the analog battery can be enlarged through voltage following adjustment; the power output of the analog battery adopts a power tube with linear regulation, so that the quality of output voltage is improved.

Drawings

FIG. 1 is a block diagram of a high power analog battery system provided by the present invention;

FIG. 2 is a functional block diagram of a power factor correction unit provided in the present invention;

FIG. 3 is a schematic diagram of a circuit structure of a PFC unit according to the present invention;

FIG. 4 is a functional diagram of an output synchronous follower unit according to the present invention;

FIG. 5 is a block diagram of an output synchronous follower unit according to the present invention;

FIG. 6 is a schematic diagram of a resonant controller driving circuit according to the present invention;

fig. 7 is a circuit diagram of a resonant controller LCC provided in the present invention;

FIG. 8 is a functional block diagram of a power output unit provided by the present invention;

FIG. 9 is a schematic diagram of a power output circuit according to the present invention;

FIG. 10 is a schematic diagram of an ADC, a DAC and a voltage measurement circuit according to the present invention;

FIG. 11 is a block diagram of a charging and discharging power circuit provided by the present invention;

fig. 12 is a block diagram of an output protection switch and an output protection control circuit provided in the present invention;

FIG. 13 is a schematic diagram of the current sensing circuit, current step selector switch and current step control circuit according to the present invention;

FIG. 14 is a schematic diagram of a differential pressure and optocoupler control circuit according to the present invention;

fig. 15 is a schematic diagram of a voltage shift and optical coupling control circuit according to the present invention.

In the figure: VCC1, first direct current; VCC2, second direct current; VCC3, third direct current; VCC4, fourth direct current; VCC5, fifth dc; VO, direct current at the tail end.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the present application, the term "switching tube" refers to a general term for MOS, triode, IGBT, etc., and in the embodiments, the term "switching tube" is usually used to refer to an NMOS tube as an example, thereby defining a drain as its first switch terminal, a source as its second switch terminal, and a gate as its controlled terminal.

Referring to fig. 1 to 15, the present invention provides a high power analog battery, which includes a power factor correction unit, an output synchronous following unit and a power output unit. The power factor correction unit is used for converting input commercial alternating current into high-voltage first direct current VCC1, correcting the power factor of the commercial alternating current, improving the power factor and reducing reactive current; the output synchronization following unit acquires a first direct current VCC1 from the power factor correction unit and outputs a third direct current VCC3 of 2-52V; the power output unit acquires a third direct current VCC3, outputs a tail end direct current VO, and feeds back the tail end direct current VO to the output synchronous following unit, so that the output synchronous following unit adjusts the pressure difference of the adjusting tube in the power output unit or fixes the voltage during operation, the constant voltage is maintained all the time, the power consumption of the power adjusting tube is reduced, the stability of the high-power simulation battery system is improved, the test requirement of current battery capacity increase is met, the heat productivity is reduced, the heat dissipation of elements and the optimization of a radiator are facilitated, the volume and the quality of the high-power simulation battery are reduced, and the high-power simulation battery is lighter and more portable.

The inductive load or the capacitive load enables the power factor of the power grid to be smaller than 1, the too small power factor wastes the capacity of the power supply equipment, and the power factor correction unit corrects the power factor.

Referring to fig. 3, the power factor correction unit has a PFC module, where the PFC module includes a first common mode inductor for being electrically connected to a commercial ac, a second common mode inductor connected to the first common mode inductor, and a rectifier module connected to the second common mode inductor, an anode of the rectifier module is connected to a coil L1A, an output terminal of the coil L1A is connected to a drain of a switching tube Q1, a source of the switching tube Q1 is grounded, a gate of the switching tube Q1 is connected to a driving terminal of the power factor controller, the switching tube Q1, the coil L1A, a capacitor C1, and the power factor controller constitute a power factor correction circuit, when the switching tube Q1 is turned on, a current flows through the coil L1A, the current linearly increases before the coil L1A is not saturated, electric energy is stored in the coil L1A in the form of magnetic energy, and at this time, the capacitor C1 discharges to provide energy for a load at a later stage; when the switching tube Q1 is turned off, a self-induced electromotive force is generated across the coil L1A to keep the current direction unchanged. Thus, the self-induced electromotive force is connected in series with the power supply output from the rectifier module to supply power to the capacitor C1 and the load.

Preferably, the switching tube Q1 is an NMOS tube.

The beneficial effects brought by the method are as follows: the input current is completely continuous and can be modulated in the sine period of the whole input voltage, so that a high power factor can be obtained; the current of the coil L1A is the input current, and is easy to adjust; the grid driving signal ground and the output of the switching tube Q1 are connected with the ground in common, and the driving is simple; the input current is continuous, the current peak value of the switching tube Q1 is small, the adaptability to the input voltage change is strong, and even the commercial power voltage change is large.

Referring to fig. 2, the power factor correction unit includes an auxiliary power supply for generating a second dc voltage VCC2 at a low voltage to supply power to the power factor controller.

In order to avoid surge current generated in the moment of starting up, a power type thermistor is connected in series in an alternating current circuit at the front stage of the rectifier module and is specifically arranged between a first common mode inductor and a second common mode inductor, the thermistor is a thermistor with a negative temperature coefficient, the resistance value of the thermistor is reduced along with the temperature increase, when the load is too heavy, the current flowing through the thermistor is increased, the temperature of the current is increased, in order to prevent the thermistor from being burnt out due to too high temperature, a first voltage feedback circuit is further arranged and is used for collecting the voltage of a first direct current VCC1, the output end of the first voltage feedback circuit is connected with a switching tube Q2 which is connected with the base of a switching tube Q2, the emitter of the switching tube Q2 is grounded, the thermistor is connected in parallel with a relay, two normally open contacts of the relay are connected with two ends of the thermistor, and two ends of a coil of the relay are respectively connected with a low-voltage direct current VCC2, The collector of switch tube Q2 is connected, goes to the opening and shutting of control relay through switch tube Q2, and when the electric current of output was too high, the switch in the relay was closed, with the thermistor short circuit, has avoided thermistor to be burnt out.

Preferably, the switching transistor Q2 is an NPN-type transistor.

In one embodiment, a typical value for high voltage dc VCC1 is 390V, and a typical value for low voltage dc VCC2 is 12V.

Referring to fig. 4, the output synchronous follower unit includes an input port connected to an output port of the power factor correction unit, and acquires a first dc VCC1 and a second dc VCC2 from the power factor correction unit, and a control input port connected to the power output unit, and is configured to provide a 12V power and a control signal, and finally output a third dc VCC3 to the power output unit.

Referring to fig. 5, the output synchronous following unit includes a primary auxiliary power supply and a secondary auxiliary power supply, and the primary auxiliary power supply converts the second dc VCC2 into a fourth dc VCC4 to supply power to the resonant controller; the 12V of the control input port supplies power to the secondary auxiliary power supply, the secondary auxiliary power supply converts the voltage into fifth direct current VCC5 and 2.5V voltage to supply power to the voltage and current feedback circuit, and the control signal is used for the optical coupler control circuit.

Referring to fig. 6, the output synchronous follower unit includes a resonant controller for outputting a 50% duty cycle, and high and low sides are 180 degrees out of phase at the same time. The resonance controller is connected with a first direct current VCC1 and a fourth direct current VCC4, outputs a voltage driving signal SQH, and comprises a plurality of controlled ends controlled by an optical coupling control circuit, and the optical coupling control circuit is connected with the controlled ends; the high-end suspended gate driving output pin of the resonant controller is connected with the base of a PNP type triode Q8, the low-end gate driving output pin of the resonant controller is connected with the base of a PNP type triode Q7, the emitting electrode of the triode Q8 is connected with the gate of a switching tube Q4, and the drain of the switching tube Q4 is connected with a first direct current VCC 1; an emitter of the triode Q7 is connected with a gate of the switching tube Q6, a drain of the switching tube Q6 is connected with a source of the switching tube Q4, a source of the switching tube Q4 is grounded, and a collector of the triode Q7 is grounded; the floating ground pin of the high-side gate drive of the resonant controller is respectively connected with the collector of the triode Q8 and the source of the switching tube Q4, and the first direct current VCC1 is modulated by the circuit to generate a voltage drive signal SQH.

Referring to fig. 7, a voltage driving signal SQH is input to an LCC circuit, the LCC circuit includes a synchronous rectification controller U8, a voltage driving signal SQH is input to a transformer T3B, the transformer T3B has a primary side coil LR3, a secondary side coil T3D with a center tap, and a transformer T3E, one end of the primary side coil LR3 is connected to the voltage driving signal SQH, the other end of the primary side coil LR3 is grounded through an X capacitor CR3, and the X capacitor CR3 is used for eliminating differential mode interference; the two ends of the secondary side coil are respectively connected with the drain electrode of the switching tube Q13 and the drain electrode of the switching tube Q14, and the center tap is used for outputting third direct current VCC3 with the output of 2-52V.

A first drain end of the synchronous rectification controller U8 is connected with a drain electrode of the switching tube Q14, a first gate end is connected with a gate electrode of the switching tube Q14, and a first source end is connected with a source electrode of the switching tube Q14; the second drain terminal of the synchronous rectification controller U8 is connected to the drain of the switching transistor Q13, the second gate terminal is connected to the gate of the switching transistor Q13, and the second source terminal is connected to the source of the switching transistor Q13.

The LCC circuit also includes a primary side current sampling circuit that samples the current on the primary side of transformer T3B for feedback to the resonant controller. The primary side current sampling circuit comprises a resistor R68 connected with the other end of the primary side coil LR3, the resistor R68 is connected with the middle node of a switch diode D5 used for suppressing conducted interference through a series capacitor C6, a switch diode D5 comprises two end-to-end connected diodes, the anode of the switch diode D5 is grounded, and the cathode of the switch diode D5 is connected with a current detection signal input end of the resonance controller through a CS line.

Furthermore, the cathode of the switching diode D5 is also connected to a resistance-capacitance filter circuit, which is grounded through a resistor R75, a capacitor R79 and a capacitor C21, and the resistor R75, the capacitor R79 and the capacitor C21 connected in parallel form the resistance-capacitance filter circuit.

The LCC circuit comprises a plurality of same circuits, and the LCC circuits are connected in parallel, so that the output power and the output stability are increased.

Referring to fig. 5, voltage current feedback circuit includes voltage feedback circuit and current feedback circuit, the opto-coupler control circuit includes first opto-coupler, second opto-coupler and third opto-coupler, control input port passes through the first opto-coupler of PS _ ON line control, secondary auxiliary power supply provides the power supply of 2.5V for voltage feedback circuit, control input port passes through third direct current VCC3 and terminal direct current VO control second opto-coupler, the output of second opto-coupler and third opto-coupler is parallelly connected, the output of third opto-coupler respectively with resonant controller's intermittent type operating mode threshold pin, lowest oscillation frequency sets up the pin and connects.

The voltage feedback circuit detects the voltage value of the third direct current VCC3, the primary auxiliary power supply is controlled through the first optical coupler, the primary auxiliary power supply outputs or turns off the fourth direct current VCC4, and when the third direct current VCC3 is detected to be overvoltage, the primary auxiliary power supply turns off the output, so that the overvoltage protection effect is realized.

The current detection circuit detects the current value of the third direct current VCC3, and the current value is fed back to the resonance controller through the third optical coupler, so that the resonance controller can work or stand by, and intermittent work is realized.

Referring to fig. 8, the power output unit includes a power output circuit, an MCU, an ADC, a DAC, a communication circuit, a power control interface, and a voltage measurement circuit, wherein the MCU is used for overall system control of the power output circuit; the ADC is used for converting analog signals into digital signals; DCA is used for digital to analog signal conversion; the communication circuit is used for the MCU to communicate with the outside; the power supply control interface is used for providing a control signal; the voltage measuring circuit is used for measuring the voltage output by the power output circuit; the control input port acts as a shared interface, is connected with the power output unit and the output synchronous following unit and is used for providing voltage and control signals, including control signals Ct1_ Up and Ct1_ Down and the like.

The power output circuit can be used for discharging and charging, wherein discharging refers to that the power output circuit provides voltage for external electric equipment to work; the charging means that the power output unit is used as a load to consume electric energy for completing the charging function test of the tested product.

Referring to fig. 9, the power Output circuit includes a discharging power adjusting tube located at the upper portion and a charging power adjusting tube located at the lower portion, a power input end of the discharging power adjusting tube is used for being connected to a third direct current VCC3 of the Output synchronous following unit, and is controlled by a Ct1_ Up signal line, so that the discharging power adjusting tube performs a switching operation according to a predetermined frequency, an Output _ V line obtains a voltage, and a final Output terminal direct current VO is provided to an external power consumption device.

When charging, external voltage is introduced into an Output _ V line of the power Output circuit and is controlled by a Ct1_ Down signal line, so that the charging power adjusting tube performs switching action according to a preset frequency, and the charging power adjusting tube consumes electric energy, thereby completing the charging test of a tested product.

Specifically, as shown in fig. 11, the discharge power adjusting transistor includes a switching transistor Q15, a drain of the switching transistor Q15 is used for inputting a third direct current VCC3, a source of the switching transistor Q15 is connected to an Output _ V line through a resistor R19, a gate of the switching transistor Q15 is connected to a Ct1_ Up signal line, when the Ct1_ Up signal line is at a high level, the switching transistor Q15 is turned on, and the third direct current VCC3 falls into the Output _ V line, so that the third direct current VCC3 is discharged to the outside.

Furthermore, in order to improve the Output power and the Output stability, the power converter further comprises a switching tube Q16 controlled by the switching tube Q15 after being turned on, a drain of the switching tube Q16 is used for inputting a third direct current VCC3, a source of the switching tube Q16 is connected with an Output _ V line through a resistor R32, a gate of the switching tube Q16 is connected with an Output end of a comparator U6, an inverting input end of the comparator U6 obtains a reference voltage from the line Clt _ VCC through a resistor R26, a non-inverting input end of the comparator U6 is connected with a source of the switching tube Q15, a positive electrode of the comparator U6 is connected with the line Clt _ VCC, and a negative electrode of the comparator U6 is connected with the Output _ V line. When the switching tube Q15 is turned on, the comparator U6 outputs a high level to turn on the switching tube Q16, and the path of the third dc VCC3 loaded to the Output _ V line is increased. The resistors R19 and R32 are extremely small in resistance and can carry a large current, and are preferably alloy resistors.

During discharging, the switching tube Q15 is firstly conducted, and the switching tube Q16 is then conducted, so that current impact caused by simultaneous conduction is avoided by time delay, and in addition, the switching tube Q16 can be independently controlled through Ctl _ VCC to control the number of the conducting switching tubes and control the output power; the switch tube Q15 and the switch tube Q16 are power tubes with linear adjustment, and output voltage quality is improved.

More combined circuits of the switching tube Q16 and the comparator U6 can be provided, and the path of the third direct current VCC3 loaded to the Output _ V line is further increased, so that the Output current is improved, the stability of the Output is enhanced, and the Output power is increased.

The charging power adjusting tube comprises a switch tube Q17, the drain of the switch tube Q17 is used for inputting the voltage of an Output _ V line, namely, when a tested product is tested and charged, the power supply voltage of the tested product is on the Output _ V line, the source of the switch tube Q17 is connected with a ground wire GND through a resistor R27, the gate of the switch tube Q17 is connected with a Ct1_ Down signal line, when the Ct1_ Down signal line is in a high level, the switch tube Q17 is conducted, the power supply of the tested product falls into the ground wire GND, and therefore electric energy is consumed.

Furthermore, in order to improve the load capacity, the load-balancing circuit further comprises a switching tube Q18 controlled by the switched-on switching tube Q17, wherein the drain of the switching tube Q18 is used for inputting the voltage of an Output _ V line, the source of the switching tube Q18 is connected with a ground GND through a resistor R33, the gate of the switching tube Q18 is connected with the Output end of a comparator U7, the inverting input end of the comparator U7 acquires a reference voltage from a 12V power supply through a resistor R31, the non-inverting input end of the comparator U7 is connected with the source of the switching tube Q17, the positive end of a comparator U7 is provided with the 12V voltage, and the negative end of a comparator U7 is connected with the ground GND. When the switching tube Q17 is turned on, the comparator U7 outputs a high level to turn on the switching tube Q18, and the path for the voltage of the Output _ V line to be applied to the ground GND increases. The resistors R27 and R33 are extremely small in resistance and can carry a large current, and are preferably alloy resistors.

More combined circuits of the switching tube Q18 and the comparator U7 can be adopted, the voltage of the Output _ V line is loaded to the ground line GND, the load capacity is improved, the stability of the load is enhanced, and the load power is increased.

The switch tube Q15, the switch tube Q16, the switch tube Q17 and the switch tube Q18 are preferably linear power NMOS tubes, so that the glitch interference generated by the output of the traditional analog battery DC/DC switch can be effectively inhibited, the dynamic response speed is improved, the output voltage clutter interference is small, the voltage is pure and stable, and the quality and the efficiency of a test product of the analog battery are improved; the average current is changed by changing the duty ratio through a Ct1_ Up signal line and a Ct1_ Down signal line so as to change the time length of the output current.

Referring to fig. 9, a current detection resistor is connected in series to the ground GND, and the output current amplification circuit collects the voltage across the current detection resistor and sends the voltage to the MCU. The current detection resistor comprises a first current detection resistor used for detecting the magnitude of current in an ampere level and a second current detection resistor used for detecting current in a milliampere level.

A current gear selector switch is further arranged on the ground wire GND and connected in parallel with a second current detection resistor, the MCU controls the current gear selector switch through a current gear control circuit, when the current gear selector switch is switched off, the current in the circuit is small, the second current detection resistor plays a main role, and the current detection is more accurate; when the current gear shifting switch is closed, a larger current can flow through the circuit, the second current detection resistor is short-circuited, and the second current detection resistor does not work; and selecting the current gear selector switch to be switched off or switched on according to different application scenes.

The current gear change-over switch can be switched automatically or manually, and is preferably automatically switched under the control of an MCU (microprogrammed control Unit), the current condition detected by the output current amplifying circuit is used as a judgment basis in automatic, and the current gear change is automatically switched to a small current gear when the current is reduced to a preset value, so that the voltage change of charging and discharging of a battery in a certain time period is simulated, the current measurement is more accurate, and the static current and the power consumption of a test product are very convenient; when manual, can go through control panel to set up, go to adjust according to user's demand.

Specifically, referring to fig. 13, a resistor R41 is a first current detection resistor, a resistor R40 is a second current detection resistor, a switching tube Q23 and a switching tube Q24 form a current step switching switch, and a transistor Q26 and a transistor Q27, a resistor R38 and a resistor R39 form a current step control circuit.

It can be understood that, in order to increase the output current in the circuit and increase the output power, a plurality of switching tubes may be arranged in parallel with the switching tube Q23 and the switching tube Q24, respectively.

Preferably, the switching tube Q23 and the switching tube Q24 are NMOS tubes.

Further, a capacitor C11 is connected in parallel between the drain and the source of the switching tube Q23 for reducing switching spikes and reducing electromagnetic radiation.

When the MCU generates a low level through the port A/mA, the triode Q26 is cut off, the base electrode of the triode Q27 obtains voltage through the pull-up resistor R38, the triode Q27 is conducted, the grid electrodes of the switch tube Q23 and the switch tube Q24 obtain starting voltage and are conducted, namely, the current gear change switch is closed, the second current detection resistor is short-circuited, large current can flow through the circuit, and ampere-level current in the first current detection resistor detection circuit is fed back to the MCU through the output current amplification circuit.

When the MCU generates a high level through the port A/mA, the triode Q26 is conducted, the base electrode of the triode Q27 is grounded, the triode Q27 is cut off, the grid electrodes of the switch tube Q23 and the switch tube Q24 lose opening voltage and are cut off, namely, the current gear change switch is switched off, the current flows through the second current detection resistor, a small current flows through the circuit, and the second current detection resistor detects a milliampere-level current in the circuit and feeds the milliampere-level current back to the MCU through the output current amplifying circuit.

In order to detect the current during charging and discharging respectively, the output current amplifying circuit comprises an operational amplifier U9-A and an operational amplifier U9-B, the 1 st end of a first current detection resistor (R41) is connected with the inverting input end of the operational amplifier U9-A and the non-inverting input end of the operational amplifier U9-B respectively, and the 2 nd end of a first current detection resistor (R41) is connected with the non-inverting input end of the operational amplifier U9-A and the inverting input end of the operational amplifier U9-B respectively; the 1 st end of a second current detection resistor (R40) is respectively connected with the non-inverting input end of the operational amplifier U9-A and the inverting input end of the operational amplifier U9-B, and the 2 nd end of the second current detection resistor (R40) is connected with the non-inverting input end of the operational amplifier U9-A and the inverting input end of the operational amplifier U9-B through a diode D3 and a diode D4 which are connected in parallel in an opposite direction; this allows current amplification from different current directions.

Referring to fig. 9, an output protection switch is further disposed on the ground GND, the MCU controls the output protection switch through the output protection control circuit according to the current condition detected by the output current amplifying circuit, and turns off the output protection switch when the current exceeds a threshold.

Referring to fig. 12, the output protection switch includes a switching tube Q19 and a switching tube Q20, a drain of the switching tube Q19 is connected to a line at the front end of the protection, a source of the switching tube Q19 is connected to a source of the switching tube Q20, a drain of the switching tube Q20 is an output line at the rear end of the protection, and gates of the switching tube Q19 and the switching tube Q20 are connected to an output protection control circuit.

The output protection control circuit comprises an optocoupler Q21 and an optocoupler Q22, an emitter of the optocoupler Q21 is connected with a source electrode of a switching tube Q19, a collector of the optocoupler Q21 is connected with a switching tube Q19 and a grid electrode of the switching tube Q20 respectively, an emitter of the optocoupler Q22 is connected with a collector of the optocoupler Q21 through a resistor R37, and a collector of the optocoupler Q22 is provided with 12V voltage; the negative pole of the optical coupler Q22 is grounded, the negative pole of the optical coupler Q22 is connected with the negative pole of the optical coupler Q21 through the resistor R35 and the resistor R36 which are connected in series, the positive pole of the optical coupler Q21 is provided with 3.3V voltage, and the middle junction of the resistor R35 and the resistor R36 is connected with the port OUT of the MCU.

MCU produces high-low level through its port OUT, makes opto-coupler Q21 and opto-coupler Q22 work in turn, and when opto-coupler Q21 during operation, the inside triode of opto-coupler Q21 switches on for switch tube Q19 and switch tube Q20's V_GSIs 0, V_GS<V_THThe switch tube Q19 and the switch tube Q20 are cut off, namely the output protection switch is switched off, so that the protection function is realized; when the optocoupler Q22 works, the internal triode of the optocoupler Q22 is conducted, so that the grids of the switching tube Q19 and the switching tube Q20 acquire voltage V_GS>V_THThe switching tube Q19 and the switching tube Q20 are turned on, that is, the output protection switch is closed, so as to form a path.

Furthermore, a plurality of switching tubes may be respectively connected in parallel with the switching tube Q19 and the switching tube Q20 to increase the output current and the output power.

It is understood that the current detection resistor, the current step switch and the Output protection switch can also be arranged on the Output _ V line.

As shown in fig. 9, the conventional analog battery is directly connected to the output current amplifying circuit by using the MCU, so that the MCU directly samples the analog signal, and the analog battery has the advantage of high response speed, is limited by the characteristics of the MCU itself, and thus has low display accuracy.

As shown in fig. 10, in order to provide the accuracy of current display, a current signal ADC for converting a current analog quantity into a digital quantity is provided, an input end of the current signal ADC is connected to both ends of a current detection resistor, an output end of the current signal ADC is connected to an MCU, and a sampling number is sent to the MCU via the separate high-accuracy current signal ADC, so that the sampling accuracy can be improved.

Further, the current signal ADC includes a current safety gear ADC and a current milliampere gear ADC, and input ends of the current safety gear ADC and the current milliampere gear ADC are respectively connected to two ends of the first current detection resistor and the second current detection resistor.

The voltage measuring circuit comprises a local output sampling circuit and a remote output sampling circuit, and the local output sampling circuit is used for adopting the output voltage of a local port; because the power transmission line has the overlength condition when the product to be measured uses, cause and have the pressure drop on the power transmission line, the voltage that shows does not represent the true voltage value that the product to be measured obtained, still is equipped with far-end output sampling circuit for this reason, uses the far-end sampling to solve the heavy current pressure drop problem.

Furthermore, in order to improve the accuracy of voltage measurement, the voltage measurement device also comprises a voltage signal ADC, so that the sampling is more accurate and the display is more accurate.

Parameters controlled by the display screen or data set by parameters of an external upper computer, an ATE test cabinet and the like are sent to the MCU by the communication circuit, processed by the MCU, converted by the DAC and sent to the power output circuit, and then output voltage is controlled.

Preferably, the communication circuit is an RS485 communication circuit.

Referring to fig. 14, in order to solve the problem of the voltage difference of the discharge power regulating tube in the power output circuit, the optocoupler control circuit obtains a third direct current VCC3 and a terminal direct current VO from the power output unit, respectively, because the discharge power regulating tube has a voltage difference, the voltage of the terminal direct current VO will be lower than the third direct current VCC3, when the voltage difference between the two is lower than a threshold, the second optocoupler Q30 will operate, the triode in the second optocoupler Q30 will be turned on, the relevant power pin of the resonant controller will be pulled down, so as to cause the resonant controller to adjust the output frequency, and further change the third direct current VCC3 and the terminal direct current VO, that is, when the output synchronous following unit follows the voltage difference of the regulating tube in the power output unit to adjust or operate with a fixed voltage, the output voltage is always maintained at a fixed voltage, the power consumption of the power regulating tube itself is reduced, the operational stability of the high-power analog battery system is improved, and the current test requirement of increasing the battery capacity is satisfied, the heat productivity is reduced, the heat dissipation of elements and the optimization of a radiator are facilitated, the size and the mass of the high-power simulation battery are reduced, and the high-power simulation battery is lighter and more convenient to carry.

Specifically, a collector of the second optocoupler Q30 is connected with the resonance controller, an emitter of the second optocoupler Q30 is connected to the ground HGND, an anode of the second optocoupler Q30 is connected with a third direct current VCC3 through a constant current circuit, a cathode of the second optocoupler Q30 is connected with a terminal direct current VO, an external voltage difference signal is formed between voltages of the third direct current VCC3 and the terminal direct current VO, and the constant current circuit performs current limiting, so that the control precision is improved. The constant current circuit comprises an NPN type triode Q31 and a triode Q32, the base electrode of the triode Q31 is connected with the emitting electrode of the triode Q32, the collector electrode of the triode Q31 is connected with the base electrode of the triode Q32, a resistor R46 for current sampling is arranged between the base electrode and the emitting electrode of the triode Q31, the emitting electrode of the triode Q31 is connected with the anode of a second optocoupler Q30, and the base electrode of the triode Q32 is connected with the direct current switching power supply through a bias resistor R47.

In addition, referring to fig. 15, the voltage gear shifting circuit obtains a third direct current VCC3 from the power output unit, and the third direct current VCC is fed back to the resonant controller through the comparator U10 and the optocoupler Q33, so as to adjust the oscillation frequency of the resonant controller, thereby implementing voltage gear shifting. The non-inverting input end of the comparator U10 obtains voltage division from a third direct current VCC3 through a resistor voltage division circuit formed by a resistor R49 and a resistor R50, the inverting input end of the comparator U10 is provided with reference voltage, the output end of the comparator U10 is connected with the anode of an optocoupler Q33 through the resistor R51, the cathode of the optocoupler Q33 is connected with the ground, the collector of the optocoupler Q33 is connected with the resonance control of the output synchronous following unit, and the emitter of the optocoupler Q33 is grounded.

In summary, the high-power analog battery provided by the utility model is improved aiming at the defects of the prior art, the resonant controller of the output synchronous following unit outputs a voltage driving signal waveform to the LCC circuit for power conversion, the voltage driving signal waveform is converted by the LCC circuit to provide voltage for output, the voltage and current signals at the output end are transmitted to the voltage and current feedback circuit, and the voltage and current feedback signals are transmitted to the feedback end of the resonant controller through the optocoupler control circuit, so as to control the voltage and current output of the power supply; and an output voltage signal of the power output unit is input into the optical coupling control circuit to control the voltage output by the synchronous following unit to follow the output voltage of the whole high-power analog battery. The front-stage power supply adopts an adjustable LCC switching power supply, so that the volume of a high-power instrument can be reduced in a large range, and the mass of the instrument can be reduced; the adjustable voltage range of the output of the analog battery can be enlarged through voltage following adjustment; the power output of the analog battery adopts a power tube with linear regulation, so that the quality of output voltage is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a high-power simulation battery, is including the power output unit who is used for exporting terminal direct current (VO), its characterized in that still includes the synchronous following unit of output that is used for exporting third direct current (VCC3), power output unit includes power output circuit, power output circuit's power input end is connected with the power output end of the synchronous following unit of output, power output circuit is equipped with the discharge power adjusting tube, the synchronous following unit of output basis carry out dynamic regulation output third direct current (VCC3) according to the pressure difference signal between the input of discharge power adjusting tube and the output.

2. The high-power analog battery according to claim 1, wherein an optical coupling control circuit for feeding back the differential pressure signal is arranged between the power output unit and the output synchronous following unit.

3. The high-power analog battery according to claim 2, wherein the output synchronous follower unit comprises an LCC circuit for power conversion, a resonant controller for providing a voltage driving signal to the LCC circuit, the optical coupling control circuit feeds back the voltage difference signal to the resonant controller, and the LCC circuit outputs a third direct current (VCC3) to the power output unit.

4. The high power analog battery according to claim 3, wherein the output synchronous follower unit further comprises a voltage current feedback circuit for feeding back a parameter of the third direct current (VCC3) to the resonant controller.

5. The high-power analog battery according to claim 4, wherein the LCC circuit comprises a transformer, a synchronous rectification controller, and a switching tube Q13 and a switching tube Q14 controlled by the same-frequency rectification controller, a primary side of the transformer is used for inputting a voltage driving signal, a secondary side of the transformer is provided with a center tap for outputting a third direct current (VCC3), two ends of the secondary side are respectively connected with a first switching end of the switching tube Q13 and a first switching end of the switching tube Q14, a second switching end of the switching tube Q13 and a second switching end of the switching tube Q14 are respectively connected with the synchronous rectification controller, and a controlled end of the switching tube Q13 and a controlled end of the switching tube Q14 are respectively connected with the synchronous rectification controller.

6. The high power analog battery of claim 5, wherein the LCC circuit further comprises a primary side current sampling circuit for feeding back a primary side current to the resonant controller.

7. The high-power analog battery according to claim 1, wherein the discharge power adjusting tube comprises a switching tube Q15, and further comprises a switching tube Q16 controlled by a switching tube Q15, the controlled end of the switching tube Q16 is connected with the output end of a comparator U6, the non-inverting input end of the comparator U6 is connected with the second switching end of the switching tube Q15, the inverting input end of the comparator U6 is provided with a reference voltage, a third direct current (VCC3) is input to the first switching ends of the switching tube Q15 and the switching tube Q16, the second switching ends of the switching tube Q15 and the switching tube Q16 are used for outputting a terminal direct current (VO), and the discharge power adjusting tube is a linear adjusting power tube.

8. The high-power analog battery according to claim 7, wherein the power output unit further comprises a charging power adjusting tube for load test, and a current detecting resistor, a current gear switching switch and an output protection switch are connected in series to the output line of the power output circuit.

9. The high-power analog battery according to claim 8, further comprising a voltage shift circuit for obtaining a third direct current (VCC3) from the power output unit, and feeding back the third direct current (VCC3) to the output synchronous following unit through a comparator U10 and an optocoupler Q33, wherein a non-inverting input terminal of the comparator U10 obtains a divided voltage from the third direct current (VCC3) through a resistance voltage dividing circuit, an inverting input terminal of the comparator U10 is provided with a reference voltage, an output terminal of the comparator U10 is connected with an anode of the optocoupler Q33 through a resistance R51, a cathode of the optocoupler Q33 is connected to ground, a collector of the optocoupler Q33 is connected with resonance control of the output synchronous following unit, and an emitter of the optocoupler Q33 is connected to ground.

10. The high power analog battery according to any one of claims 1 to 9, comprising a power factor correction unit for providing a first direct current (VCC1) voltage to the output synchronous follower unit, the power factor correction unit is provided with a PFC module, the PFC module comprises a first common-mode inductor used for being connected with commercial power and a second common-mode inductor connected with the first common-mode inductor, the anode of the rectifying module is connected with the input end of a coil L1A, the output end of the coil L1A is connected with the first switch end of a switch tube Q1, the second switch end of the switch tube Q1 is grounded, the controlled end of a switch tube Q1 is connected with the drive end of the power factor controller, the output end of the coil L1A is grounded through a capacitor C1, the switching tube Q1, the coil L1A, the capacitor C1 and the power factor controller form a power factor correction circuit; there is thermistor in series connection in the alternating current circuit of rectifier module front-end, thermistor parallel has the relay, still is equipped with the switch tube Q2 that is used for controlling the relay and opens and shuts, and switch tube Q2 is connected with and is used for controlling its first voltage feedback circuit that switches on and ends, and first voltage feedback circuit is used for sampling first direct current (VCC 1).