CN105823990B - A kind of fictitious load for testing SOC power supplys - Google Patents

A kind of fictitious load for testing SOC power supplys Download PDF

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Publication number
CN105823990B
CN105823990B CN201510000928.4A CN201510000928A CN105823990B CN 105823990 B CN105823990 B CN 105823990B CN 201510000928 A CN201510000928 A CN 201510000928A CN 105823990 B CN105823990 B CN 105823990B
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current
module
control
adjustment unit
control module
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CN105823990A (en
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葛亮宏
叶飞
何天长
况波
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Shanghai Ruilin Microelectronics Co.,Ltd.
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CHENGDU RUICHENG XINWEI TECHNOLOGY Co Ltd
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Abstract

The invention discloses a kind of fictitious loads for testing SOC power supplys, it includes current adjustment unit, delay adjustment unit and control module;The extraction electric current input of current adjustment unit is connect with analog power anode, the electric current output of current adjustment unit is connect with analog power cathode, the current control input of current adjustment unit is connected with the current control output of control module, and the delays time to control input of current adjustment unit is connected by the delays time to control output of be delayed adjustment unit and control module;Control module control current adjustment unit simulates the operating current for being modeled load, and the power output end of power supply to be measured exports extraction electric current to be tested, then the performance test to power supply to be measured can be completed by power supply testing device;Control module also controls the extraction electric current that current adjustment unit is inputted by the adjustment unit that is delayed and changes linearly.The present invention can simulate SOC load various change, it can be achieved that the transient state and DC load current to SOC power supplys simulation test.

Description

A kind of fictitious load for testing SOC power supplys
Technical field
The present invention relates to the simulation test fields of SOC power supplys, negative more particularly to a kind of simulation for testing SOC power supplys It carries.
Background technology
It becomes increasingly complex with increasingly prosperity, the integrated circuit structure of IC design industry, system on chip(SOC)More Come it is more, correspondingly, the requirement to SOC power supplys is also higher and higher;It is also higher and higher to the performance requirement of power-supply management system, Its power detecting system also becomes increasingly complex.
When the moment of saltus step occurs for load absorption electric current, the output voltage of power-supply management system moment can deviate setting value, And it needs by after a certain period of time, can be only achieved stable output state.This period is normally referred to as the load transient of power supply Recovery time or transient response time, characterization are:When transient changing occurs for load current, supply voltage restores The required time in setting range.If voltage transient responding ability is poor, transient response time is longer, causes in power supply Portion's element undercharge/charging is excessive, and output voltage falls/and overshoot time is long, amplitude is excessive, and output voltage deviates significantly from mesh Scale value.It is inaccurate or deviate the load that the desired value in electric power output voltage can cause power supply driving and break down or even It may damage, especially when load includes sensitive circuit, fast-changing device, such as microprocessor, radio-frequency devices.
Therefore, the parameters such as output voltage precision, load regulation are the important performance indexes of power-supply management system, can be passed through The output voltage precision of detection power-supply management system can evaluate the quality of the power-supply management system.
However, the fictitious load employed in current power supply test is only capable of the size of fictitious load electric current, it can not be real Now the transient changing time of fictitious load electric current is controlled, rising time when fictitious load curent change cannot be controlled With the failing edge time, the transient response performance of tested power supply cannot be accurately tested out.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of for testing the fictitious loads of SOC power supplys, The fictitious load controls the size for extracting current value by current adjustment unit, and extracting electric current by the adjustment unit control that is delayed becomes Rising time when change and failing edge time can simulate the various change of SOC loads, it can be achieved that the transient state to SOC power supplys becomes The simulation test of galvanic current and DC load current, meanwhile, but also use the power detecting system of fictitious load of the present invention Structure is simpler, test function is more easily implemented, test result is more accurate.
The purpose of the present invention is achieved through the following technical solutions:A kind of fictitious load for testing SOC power supplys, It includes current adjustment unit, delay adjustment unit and control module, and the control module includes current control module, delay Control module and data processing module.
The extraction current input terminal of the current adjustment unit is connect with analog power anode, the electricity of current adjustment unit Stream output end with dock, the current control input terminal of current adjustment unit passes through current control module and data processing module Current controling end connects, and the delays time to control input terminal of current adjustment unit passes sequentially through delay adjustment unit and delays time to control module It is connect with the delays time to control end of data processing module.
Data processing module carries out dissection process to the external control data received, extracts in the external control data Current controling signal and delay control signal, and current controling signal is sent to current control module, current control module root According to a certain size electric current of current controling signal control current adjustment unit simulation output so that defeated from the power supply of power supply to be measured The extraction electric current of outlet output is identical as the working current value for being modeled load.
Delay control signal is sent to delays time to control module by data processing module, and delays time to control module is according to the delay control The delay state of signal control delay adjustment unit processed so that the extraction that the extraction current input terminal of current adjustment unit is inputted Electric current changes linearly.
The current adjustment unit includes N+M matrix current adjustment circuits parallel with one another, each electric current adjustment electricity Road includes current draw module and switch module, and the input terminal of current draw module is connect with analog power anode, and electric current is taken out The input terminal of the output end of modulus block and switch module connects, the output end of switch module with dock, the control of switch module End is connect by the first bus with current control module.
The current draw module includes DC current source.
The switch module includes switch metal-oxide-semiconductor, and the source electrode for switching metal-oxide-semiconductor and the output end of current draw module connect It connects, the drain electrode for switching metal-oxide-semiconductor is connect with fictitious load power cathode, and the grid for switching metal-oxide-semiconductor passes through the first bus and electric current control Molding block connects.
The delay adjustment unit includes M time delay module, the input terminal of each time delay module with it is corresponding The output end of current draw module connects, and the output end of each time delay module is connected with the control terminal of corresponding switch module, The control terminal of each time delay module is connect by the second bus with delays time to control module.
The time delay module includes delay capacitor.
The control module, which further includes transient state, makes energy control module and clock signal receiving module.
The transient state makes the input terminal of energy control module pass through the enabled control port reception transient control signal of transient state, wink State makes the output end of energy control module and the transient state of data processing module enable input terminal connection.
The input terminal of the clock signal receiving module receives clock signal, clock letter by clock signal receiving port The output end of number receiving module and the clock signal input terminal of data processing module connect.
After data processing module receives transient control signal, the extraction electric current that is inputted of control current adjustment unit with Clock signal dynamic change received by clock signal receiving module.
The power output end of the power supply to be measured is also connect with the test input of power supply testing device, is surveyed by power supply Trial assembly, which is set, to be tested extracting electric current.
The power supply testing device includes oscillograph.
The beneficial effects of the invention are as follows:
1)The present invention controls the size for extracting current value by current adjustment unit, and by being delayed, adjustment unit control is extracted Rising time when curent change and failing edge time can simulate the various change of SOC loads, it can be achieved that SOC power supplys The simulation test of transient changing electric current and DC load current, meanwhile, but also using the power supply test of fictitious load of the present invention The structure of system is simpler, test function is more easily implemented, test result is more accurate.
2)The present invention is accurately high to the control for extracting electric current, extracts the rapid dynamic response speed of electric current, and its response time It can regulate and control.
3)The most important feature of the present invention is, can by two methods such as delay control method and current control methods, The delay size of curent change is extracted in control so that the variation for extracting electric current changes linearly, and realizes the electric current to extracting electric current In change curve, the control to rising time and failing edge time, to realize the survey for carrying out different stage to being tested power supply Examination can accurately detect the transient response performance of tested power supply.
Description of the drawings
Fig. 1 is a kind of basic principle block diagram for testing the fictitious load of SOC power supplys of the present invention;
Fig. 2 is a kind of system principle diagram for testing the fictitious load of SOC power supplys of the present invention;
Fig. 3 is the current curve schematic diagram that electric current is extracted in the present invention.
Specific implementation mode
Technical scheme of the present invention is described in further detail below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to It is as described below.
As shown in Figure 1, a kind of fictitious load for testing SOC power supplys, it includes current adjustment unit, delay adjustment list Member and control module, the control module include current control module, delays time to control module and data processing module.
The extraction current input terminal of the current adjustment unit is connect with analog power anode, the electricity of current adjustment unit Stream output end with dock, can be connected to analog power cathode, the current control input terminal of current adjustment unit passes through electric current The current controling end of control module and data processing module connects, and the delays time to control input terminal of current adjustment unit, which passes sequentially through, to be prolonged When adjustment unit and the delays time to control end of delays time to control module and data processing module connection.
Data processing module carries out dissection process to the external control data received, extracts in the external control data Current controling signal and delay control signal, and current controling signal is sent to current control module, current control module root According to a certain size electric current of current controling signal control current adjustment unit simulation output so that defeated from the power supply of power supply to be measured The extraction electric current of outlet output is identical as the working current value for being modeled load.
Delay control signal is sent to delays time to control module by data processing module, and delays time to control module is according to the delay control The delay state of signal control delay adjustment unit processed, the rising time for the extraction electric current that control current adjustment unit is inputted With the failing edge time so that the extraction electric current that current adjustment unit is inputted changes linearly.
Rising time may be defined as current-responsive curve and rise to time needed for steady-state value 90% from the 10% of steady-state value, The failing edge time may be defined as current-responsive curve and drop to time needed for steady-state value 10% from the 90% of steady-state value.
The current adjustment unit includes N+M matrix current adjustment circuits parallel with one another, each electric current adjustment electricity Road includes current draw module and switch module, and the input terminal of current draw module is connect with analog power anode, and electric current is taken out The input terminal of the output end of modulus block and switch module connects, the output end of switch module with dock, can be connected to simulation The control terminal of power cathode, switch module is connect by the first bus with current control module.
The current draw module is the current source circuit that output current can change in a certain range, such as be can be selected defeated Go out the DC current source that electric current can change in a certain range, other electric current electricity with the DC current source function can also be used Road.
The output current of heretofore described current draw module can change in a certain range, and not output current is perseverance Fixed constant constant current abstraction module.Since the output current of current draw module is variable, electric current change is being extracted to realize When change, the rising time for extracting curent change and failing edge time can be controlled, to change fictitious load of the present invention to tested The measuring accuracy of power supply.
Switch metal-oxide-semiconductor can be used in the switch module, it is also possible to other any switches that the identical function can be achieved.It opens The source electrode for closing metal-oxide-semiconductor is connect with the output end of current draw module, and the drain electrode and fictitious load power cathode for switching metal-oxide-semiconductor connect It connects, the grid for switching metal-oxide-semiconductor is connect by the first bus with current control module.
The delay adjustment unit includes M time delay module, the input terminal of each time delay module with it is corresponding The output end of current draw module connects, and the output end of each time delay module is connected with the control terminal of corresponding switch module, The control terminal of each time delay module is connect by the second bus with delays time to control module.
Delay capacitor circuit can be used to realize that increasing or decreasing the when of extracting curent change is undergone in the time delay module Time, any module with the delay function can also be used certainly.
The control module, which further includes transient state, makes energy control module and clock signal receiving module.
The transient state makes the input terminal of energy control module pass through the enabled control port reception transient control signal of transient state, wink State makes the output end of energy control module and the transient state of data processing module enable input terminal connection.
The input terminal of the clock signal receiving module receives clock signal, clock letter by clock signal receiving port The output end of number receiving module and the clock signal input terminal of data processing module connect.
After data processing module receives transient control signal, the extraction electric current that is inputted of control current adjustment unit with Clock signal dynamic change received by clock signal receiving module.
The present invention is additionally provided with the I for being used for transmission control data2C modules, I2The data output end of C modules and data processing The data input pin of module connects, I2The data input pin of C modules is connect with data receiver port, I2The clock signal of C modules is defeated Enter end to connect with clock signal receiving port.I2C modules are realized is converted to parallel port data by serial data.
The power output end of the power supply to be measured is also connect with the test input of power supply testing device, is surveyed by power supply Trial assembly, which is set, to be tested extracting electric current.
Oscillograph can be selected in the power supply testing device, and other power detecting instruments, the electricity to be measured can also be used Source includes the power-supply management system on system on chip SOC.
The present invention can detect whether the electric current that the power-supply management system on system on chip SOC is exported accords with by oscillograph Standard as defined in closing.Fictitious load can simulate the various load devices that SOC power-supply management systems are connected, and simulate the device The various change of required electric current.After extracting extraction electric current to be tested from power supply to be measured by fictitious load, oscillography can be used It is compared by device to observe, record the parameter of the extraction electric current with expected value, calculates the error for extracting electric current, obtains The whether standard compliant conclusion of the SOC power-supply management systems.
The present invention basic functional principle be:Control module is according to the external control signal received, control electric current adjustment The break-make of switch arrays in unit so that current adjustment unit, which exports, meets the working current value of simulated load, i.e., from waiting for Survey the extraction electric current I to be tested of the power output end output of power supplyOUTEqual to the operating current I being modeled needed for load, then adopt Extraction electric current I is detected with power supply testing device such as oscillographOUT, and further analyze power supply to be measured output electric current whether Reach standard.
The present invention can simulate the various change of SOC power source loads, it can be achieved that transient state and DC load current to SOC power supplys Simulation test.
1)Simulate the DC load of SOC power supplys
If it is DC current I to be modeled the operating current needed for load1, then only analog DC need to be sent out using external equipment The control signal of load, transient state enable signal are low level signal, which includes current controling signal and delays time to control Signal.Control module controls the switch arrays in current adjustment unit according to current controling signal and carries out selective conducting so that The extraction electric current to be tested extracted from the power output end of power supply to be measured is identical as the working current value for being modeled load, i.e., Extract electric current IOUTEqual to working direct current I1
2)Simulate the transient response load of SOC power supplys
If the operating current for being modeled load is the electric current I of dynamic change2, then need to send out transient state using external equipment enabled Signal and control signal, which includes current controling signal and delay control signal.Transient state enable signal is high level Signal, the extraction electric current I that control module control current adjustment unit is inputtedOUTReceived by clock signal receiving module The variation of clock signal and dynamic change;Control module is certain according to current controling signal control current adjustment unit simulation output The electric current of size so that the extraction electric current I extracted from the power output end of power supply to be measuredOUTWith the work electricity for being modeled load Flow I2It is identical;And the delay state of delay adjustment unit is controlled according to delay control signal, control current adjustment unit is inputted Extraction electric current IOUTIt changes linearly, rising time and failing edge time lengthening in curent change curve are extracted in also control Or it shortens.Rising time and the failing edge time that current curve can be extracted by change, to test the performance of power supply to be measured.
Clock signal and the clock signal for the operating current for being modeled load received by control module are consistent.
As shown in Fig. 2, the switch module, using switch metal-oxide-semiconductor, the time delay module uses delay capacitor.
The current adjustment unit includes 1~N+M current source, i.e. current source I1, current source I2..., current source IN, current source IN+1, current source IN+2..., current source IN+M, wherein N >=1, M >=1.The current source is that output current can be The current module changed in a certain range.
The current adjustment unit includes 1~N+M switch metal-oxide-semiconductor, that is, switchs metal-oxide-semiconductor M1, switch metal-oxide-semiconductor M2..., switch metal-oxide-semiconductor MN, switch metal-oxide-semiconductor MN+1..., switch metal-oxide-semiconductor MN+M
1~N+M current source I1~IN+MInput terminal connect with analog power anode, 1~N+M current source I1~ IN+MOutput end respectively with 1~N+M switch metal-oxide-semiconductor M1~MN+MSource electrode connection, 1~N+M switchs metal-oxide-semiconductor M1~MN+M's Drain electrode is docked with ground, or is connect with fictitious load power cathode, 1~N+M switch metal-oxide-semiconductor M1~MN+MGrid pass through The current control output port of first bus and control module connects.
The delay adjustment unit includes 1~M delay capacitor, i.e. delay capacitor C1, delay capacitor C2..., delay Capacitance CM
1~M delay capacitor C1~CMIt is connected in parallel on the N+1~N+M switch metal-oxide-semiconductor M respectivelyN+1~MN+MSource electrode and leakage The both ends of pole, delay capacitor C1~CMControl terminal pass through the delays time to control output port of the second bus and control module connect.
Wherein, the the 1st to n-th current source I1~INCurrent value size is extracted for controlling the minimum of fictitious load of the present invention, N+1 to m-th current source IN+1~IMMaximum extraction current value size for controlling fictitious load of the present invention, the 1st to M A delay capacitor C1~CMExtraction current value for controlling fictitious load of the present invention, which is changed to by minimum value required for maximum value, to pass through The duration gone through.
For example, control current source I1~INTotal extraction electric current be 1mA, control current source IN+1~IMTotal extraction electric current be 499mA so that the extraction electric current of fictitious load changes to maximum value 500mA by minimum value 1mA.Control delay capacitor C1~CMMake The rising time for obtaining the curent change process is 30 μ s.Oscillograph and fictitious load are connected on tested power supply, started pair Tested power supply is tested for the property, and oscilloscope display is tested the output voltage waveform of power supply, if the voltage oscillogram and expectation Within the allowable range, then the performance of the tested power supply complies with standard regulation to the error of oscillogram.
If setting the rising time for extracting electric current and being changed to by 1mA 500mA to 10 μ s, again to this be tested power supply into Row performance test exceeds the limits of error if the voltage oscillogram and the error of desired oscillogram on oscillograph are larger, then should Tested power supply transient response time is more than 10 μ s, power source performance and the standard regulation for not meeting higher level.
As shown in figure 3, tunable capacitor can be used in the delay capacitor, its corresponding open is controlled by tunable capacitor The current curve for closing metal-oxide-semiconductor, controls the rising time T in the current curveriseWith failing edge time Tfall.By adjusting not With the capacitance of delay capacitor so that the rising time T of difference switch metal-oxide-semiconductorriseWith failing edge time TfallIt is not consistent, from And more accurate analog current can be combined into.
When delays time to control module control tunable capacitor capacitance increase when, it is its corresponding switch metal-oxide-semiconductor rising edge when Between TriseDuration increase, failing edge time TfallAccordingly extend so that the electric current climbing time of switch metal-oxide-semiconductor output is under Time increase is dropped, to extract electric current IOUTStationary value, i.e. maximum current value I can be linearly risen at a slow speedmax, and it is slow from stationary value Speed linearly decreases to minimum current value IminOr zero.
When delays time to control module control tunable capacitor capacitance reduce when, it is its corresponding switch metal-oxide-semiconductor rising edge when Between TriseDuration reduce, failing edge time TfallIt accordingly shortens so that the electric current climbing time of switch metal-oxide-semiconductor output is under Time reduction is dropped, to extract electric current IOUTEnergy fast linear variation rises to stationary value, i.e. maximum current value Imax, and can be from steady Definite value fast linear drops to minimum current value IminOr zero.
1)The present invention can make extraction electric current I by the size of adjusting delay capacitorOUTIt changes linearly.
After fictitious load steady operation, if the capacitance of delay capacitor increases, delay capacitor will continue to charge, and flow into switch Metal-oxide-semiconductor source electrode linearly reduces with the increase of delay capacitor;If the capacitance of delay capacitor reduces, delay capacitor will start to put Electricity flows into the extraction electric current I of switch metal-oxide-semiconductor source electrodeOUTLinearly increase with the reduction of delay capacitor;The changing value of delay capacitor It is bigger, extract electric current IOUTRising time TriseIt is longer.
2)The present invention can also be by the size of regulating switch metal-oxide-semiconductor driving current, i.e., regulating switch metal-oxide-semiconductor gate terminal is defeated Enter size of current, makes extraction electric current IOUTIt changes linearly.
When driving current is larger, switch metal-oxide-semiconductor turns on and off the extraction electric current that speed is fast, which inputs The rising time T of curveriseWith failing edge time TfallWith regard to short;When driving current is smaller, switch metal-oxide-semiconductor turns on and off Speed is slow, the rising time T of the current curve of the switch metal-oxide-semiconductorriseWith failing edge time TfallWith regard to length.

Claims (9)

1. a kind of fictitious load for testing SOC power supplys, it is characterised in that:It includes current adjustment unit, delay adjustment list Member and control module, the control module include current control module, delays time to control module and data processing module;
The extraction current input terminal of the current adjustment unit is connect with positive pole to be measured, and the electric current of current adjustment unit is defeated Outlet with dock, the electric current that the current control input terminal of current adjustment unit passes through current control module and data processing module Control terminal connects, and the delays time to control input terminal of current adjustment unit passes sequentially through delay adjustment unit and delays time to control module and number It is connected according to the delays time to control end of processing module;
Data processing module carries out dissection process to the external control data received, extracts the electric current in the external control data Signal and delay control signal are controlled, and current controling signal is sent to current control module, current control module is according to this A certain size electric current of current controling signal control current adjustment unit simulation output so that from the power output end of power supply to be measured The extraction electric current of output is identical as the working current value for being modeled load;
Delay control signal is sent to delays time to control module by data processing module, and delays time to control module is believed according to the delays time to control Number control delay adjustment unit delay state so that the extraction electric current that the extraction current input terminal of current adjustment unit is inputted It changes linearly.
2. a kind of fictitious load for testing SOC power supplys according to claim 1, it is characterised in that:The electric current Adjustment unit includes N+M matrix current adjustment circuits parallel with one another, and each matrix current adjustment circuit includes current draw mould Block and switch module, the input terminal of current draw module are connect with positive pole to be measured, the output end of current draw module with open The input terminal connection of module is closed, the output end of switch module is docked with ground, and the control terminal of switch module passes through the first bus and electric Flow control module connects.
3. a kind of fictitious load for testing SOC power supplys according to claim 2, it is characterised in that:The electric current Abstraction module includes DC current source.
4. a kind of fictitious load for testing SOC power supplys according to claim 2, it is characterised in that:The switch Module includes switch metal-oxide-semiconductor, and the source electrode for switching metal-oxide-semiconductor connect with the output end of current draw module, switch metal-oxide-semiconductor drain electrode and Fictitious load power cathode connects, and the grid for switching metal-oxide-semiconductor is connect by the first bus with current control module.
5. a kind of fictitious load for testing SOC power supplys according to claim 2, it is characterised in that:The delay Adjustment unit includes M time delay module, the input terminal of each time delay module with the output of corresponding current draw module The output end of end connection, each time delay module is connected with the control terminal of corresponding switch module, the control of each time delay module End is connect by the second bus with delays time to control module.
6. a kind of fictitious load for testing SOC power supplys according to claim 5, it is characterised in that:The delay Module includes delay capacitor.
7. a kind of fictitious load for testing SOC power supplys according to claim 1, it is characterised in that:The control Module, which further includes transient state, makes energy control module and clock signal receiving module;
The transient state makes the input terminal of energy control module pass through the enabled control port reception transient control signal of transient state, and transient state makes The output end of energy control module and the transient state of data processing module enable input terminal connection;
The input terminal of the clock signal receiving module receives clock signal by clock signal receiving port, and clock signal connects The clock signal input terminal of the output end and data processing module of receiving module connects;
After data processing module receives transient control signal, the extraction electric current that control current adjustment unit is inputted is with clock Clock signal dynamic change received by signal receiving module.
8. a kind of fictitious load for testing SOC power supplys according to claim 1, it is characterised in that:Described is to be measured The power output end of power supply is also connect with the test input of power supply testing device, by power supply testing device to extract electric current into Row test.
9. a kind of fictitious load for testing SOC power supplys according to claim 8, it is characterised in that:The power supply Test device includes oscillograph.
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直流稳压电源瞬态响应的测量;李萍 等;《宇航计测技术》;20021030;第22卷(第5期);第21-25页 *

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