CN113740653B - High-precision evaluation method and circuit suitable for LDO dynamic load response - Google Patents
High-precision evaluation method and circuit suitable for LDO dynamic load response Download PDFInfo
- Publication number
- CN113740653B CN113740653B CN202111048908.6A CN202111048908A CN113740653B CN 113740653 B CN113740653 B CN 113740653B CN 202111048908 A CN202111048908 A CN 202111048908A CN 113740653 B CN113740653 B CN 113740653B
- Authority
- CN
- China
- Prior art keywords
- circuit
- storage unit
- energy storage
- charging
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Direct Current Feeding And Distribution (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a test method and a circuit, in particular to a high-precision evaluation method and a high-precision evaluation circuit suitable for LDO dynamic load response. According to the technical scheme provided by the invention, the test method for the LDO dynamic load response test comprises an LDO circuit to be tested, a test load circuit which is in adaptive connection with the output end of the LDO circuit to be tested, and a load dynamic switching control circuit which is in adaptive connection with the test load circuit, wherein the load state loaded to the output end of the LDO circuit to be tested by the test load circuit is in a cyclic switching process of a light load state and a heavy load state until the dynamic load response of the LDO circuit to be tested is obtained by measurement. The invention can effectively realize the dynamic load response test of the LDO, the test process is controllable, and the test efficiency and reliability are improved.
Description
Technical Field
The invention relates to a test method and a circuit, in particular to a high-precision evaluation method and a high-precision evaluation circuit suitable for LDO dynamic load response.
Background
LDO (linear regulator) is a power management circuit with a very large application scale on the market at present, and has a dynamic load response in the core parameter. The dynamic load response of the LDO generally needs to be obtained through a test mode. At present, aiming at the dynamic load response of LDO, a test method with strong practicability, high reliability and good testability is lacked, and the test requirement in production is difficult to meet.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-precision assessment method and circuit suitable for LDO dynamic load response, which can effectively realize the dynamic load response test of LDOs, have controllable test process and improve the test efficiency and reliability.
According to the technical scheme provided by the invention, the test method for the LDO dynamic load response test comprises an LDO circuit to be tested, a test load circuit which is in adaptive connection with the output end of the LDO circuit to be tested, and a load dynamic switching control circuit which is in adaptive connection with the test load circuit, wherein the load state loaded to the output end of the LDO circuit to be tested by the test load circuit is in a cyclic switching process of a light load state and a heavy load state until the dynamic load response of the LDO circuit to be tested is obtained by measurement.
The test load circuit comprises a load capacitor C1, a resistor R1 and a resistor R2 which are connected with the output end of the LDO circuit to be tested, wherein one end of the load capacitor C1, one end of the resistor R1 and one end of the resistor R2 are connected with the output end of the LDO circuit to be tested, the other end of the load capacitor C1 and the other end of the resistor R1 are grounded, the other end of the resistor R2 is in adaptive connection with the load dynamic switching control circuit, and the resistance value of the resistor R1 is larger than that of the resistor R2.
The load dynamic switching control circuit comprises an active power switch K1 and a power switch state control circuit, wherein the active power switch K1 is in adaptive connection with a resistor R2, and the power switch state control circuit is used for controlling the switching state of an active power switch K1;
one end of an active power switch K1 is connected with the resistor R2, the other end of the active power switch K1 is grounded, and the control end of the active power switch K1 is connected with the power switch state control circuit;
the power switch state control circuit comprises an energy storage unit, an energy storage unit charging circuit capable of charging the energy storage unit, an energy storage unit discharging circuit used for amplifying the energy storage unit and a charging and discharging switching circuit used for controlling the charging and discharging states of the energy storage unit;
when the energy storage unit is charged by the energy storage unit charging loop through the charging and discharging switching circuit, the active power switch K1 can be driven to be gradually conducted along with the gradual rise of the voltage of the energy storage unit in the charging process; when the energy storage unit is in a full-charge state, the voltage of the energy storage unit can be used for keeping the active power switch K1 in a maximum conduction state;
When the energy storage unit is discharged by the energy storage unit discharge loop through the charge-discharge switching circuit, the active power switch K1 can be driven to be gradually turned off along with the gradual reduction of the voltage of the energy storage unit in the discharge process; when the energy storage unit is in the discharging ending state, the active power switch K1 is in a complete off state.
The energy storage unit charging circuit comprises a charging one-way switch and a current-limiting charging circuit which is in adaptive connection with the charging one-way switch, the current-limiting charging circuit is connected with a charging end of the energy storage unit through the charging one-way switch, when the energy storage unit is in a full-charge state, the current-limiting charging circuit stops the charging state of the energy storage unit through the charging one-way switch, and the conduction state of the charging one-way switch can be controlled through the charging and discharging switching circuit;
the current-limiting charging circuit comprises a constant current source I1, wherein the output end of the constant current source I1 is connected with the source end of a PMOS tube P1, the grid end of the PMOS tube P1 receives a full-charge state feedback signal of the energy storage unit, the drain end of the PMOS tube P1 is connected with the grid end of an NMOS tube N1, the drain end of the NMOS tube N1 and the grid end of an NMOS tube N2, and the source end of the NMOS tube N1 and the source end of the NMOS tube N2 are grounded;
the drain end of the NMOS tube N2 is connected with the drain end of a PMOS tube P2, the grid end of a PMOS tube P2 and the grid end of a PMOS tube P3, and the source end of a PMOS tube P2, the source end of a PMOS tube P3 and the power supply end of a constant current source I1 are all connected with a power supply voltage VDD; the drain end of the PMOS pipe P3 can be electrically connected with the energy storage unit through the charging unidirectional switch.
The energy storage unit discharge loop comprises a discharge one-way switch and a current-limiting discharge circuit which is in adaptive connection with the discharge one-way switch, the current-limiting discharge circuit is connected with the discharge end of the energy storage unit through the discharge one-way switch, when the energy storage unit is discharged, the current-limiting discharge circuit stops discharging the energy storage unit, and the conduction state of the discharge one-way switch can be controlled through the charge-discharge switching circuit;
the current-limiting discharge circuit comprises an NMOS tube N5 which can be in adaptive connection with a discharge one-way switch, the drain end of the NMOS tube N5 is connected with the discharge one-way switch, the grid end of the NMOS tube N5 is connected with the grid end of the NMOS tube N4 and the drain end of the NMOS tube N4, the source end of the NMOS tube N5 and the source end of the NMOS tube N4 are both grounded, and the drain end of the NMOS tube N4 is also connected with the drain end of the PMOS tube P5;
the source terminal of the PMOS tube P5 is connected with the source terminal of the PMOS tube P4, the gate terminal of the PMOS tube P5 is connected with the gate terminal of the PMOS tube P4, the drain terminal of the PMOS tube P4 and the drain terminal of the NMOS tube N3, the source terminal of the NMOS tube N3 is grounded through a constant current source I2, and the gate terminal of the NMOS tube N3 receives a release ending feedback signal of the energy storage unit.
The charge and discharge switching circuit comprises a PWM signal generator.
A test circuit for testing the LDO dynamic load response comprises an LDO circuit to be tested, a test load circuit and a load dynamic switching control circuit, wherein the test load circuit is in adaptive connection with the output end of the LDO circuit to be tested, the load dynamic switching control circuit is in adaptive connection with the test load circuit, and the load state loaded to the output end of the LDO circuit to be tested through the test load circuit can be in the cycle switching process of the light load state and the heavy load state until the dynamic load response of the LDO circuit to be tested is obtained through measurement.
The test load circuit comprises a load capacitor C1, a resistor R1 and a resistor R2 which are connected with the output end of the LDO circuit to be tested, wherein one end of the load capacitor C1, one end of the resistor R1 and one end of the resistor R2 are connected with the output end of the LDO circuit to be tested, the other end of the load capacitor C1 and the other end of the resistor R1 are grounded, the other end of the resistor R2 is in adaptive connection with the load dynamic switching control circuit, and the resistance value of the resistor R1 is larger than that of the resistor R2.
The load dynamic switching control circuit comprises an active power switch K1 and a power switch state control circuit, wherein the active power switch K1 is in adaptive connection with a resistor R2, and the power switch state control circuit is used for controlling the switching state of an active power switch K1;
one end of an active power switch K1 is connected with the resistor R2, the other end of the active power switch K1 is grounded, and the control end of the active power switch K1 is connected with the power switch state control circuit;
the power switch state control circuit comprises an energy storage unit, an energy storage unit charging circuit capable of charging the energy storage unit, an energy storage unit discharging circuit used for amplifying the energy storage unit and a charging and discharging switching circuit used for controlling the charging and discharging states of the energy storage unit;
when the energy storage unit is charged by the energy storage unit charging loop through the charging and discharging switching circuit, the active power switch K1 can be driven to be gradually conducted along with the gradual rise of the voltage of the energy storage unit in the charging process; when the energy storage unit is in a full-charge state, the voltage of the energy storage unit can be used for keeping the active power switch K1 in a maximum conduction state;
When the energy storage unit is discharged by the energy storage unit discharge loop through the charge-discharge switching circuit, the active power switch K1 can be driven to be gradually turned off along with the gradual reduction of the voltage of the energy storage unit in the discharge process; when the energy storage unit is in the discharging ending state, the active power switch K1 is in a complete off state.
The energy storage unit charging circuit comprises a charging one-way switch and a current-limiting charging circuit which is in adaptive connection with the charging one-way switch, the current-limiting charging circuit is connected with a charging end of the energy storage unit through the charging one-way switch, when the energy storage unit is in a full-charge state, the current-limiting charging circuit stops the charging state of the energy storage unit through the charging one-way switch, and the conduction state of the charging one-way switch can be controlled through the charging and discharging switching circuit;
the energy storage unit discharge circuit comprises a discharge one-way switch and a current-limiting discharge circuit in adaptive connection with the discharge one-way switch, the current-limiting discharge circuit is connected with the discharge end of the energy storage unit through the discharge one-way switch, when the energy storage unit discharges, the current-limiting discharge circuit stops discharging the energy storage unit, and the conduction state of the discharge one-way switch can be controlled through the charge-discharge switching circuit.
The invention has the advantages that: the output end of the LDO circuit to be tested is connected to the test load circuit, the load state loaded to the output end of the LDO circuit to be tested through the test load circuit can be in the cycle switching process of the light load state and the heavy load state through the load dynamic switching control circuit until the dynamic load response of the LDO circuit to be tested is obtained through measurement, the dynamic load response test of the LDO can be effectively achieved, the test process is controllable, and the test efficiency and reliability are improved.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a timing diagram illustrating the operation of the present invention.
Fig. 3 is a schematic circuit diagram of the current-limited charging circuit of the present invention.
FIG. 4 is a schematic circuit diagram of the current limiting discharge circuit of the present invention.
Description of reference numerals: the device comprises a LDO circuit to be tested, a 2-charge-discharge switching circuit, a 3-charge one-way switch, a 4-current-limiting charge circuit, a 5-current-limiting discharge circuit, a 6-discharge one-way switch, a 7-energy storage unit and an 8-load dynamic switching control circuit.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
In order to effectively realize the dynamic load response test of the LDO and improve the efficiency and controllability of the test, the invention comprises the LDO circuit 1 to be tested, a test load circuit which is in adaptive connection with the output end of the LDO circuit 1 to be tested, and a load dynamic switching control circuit 8 which is in adaptive connection with the test load circuit, wherein the load state loaded to the output end of the LDO circuit 1 to be tested through the test load circuit is in the cycle switching process of a light load state and a heavy load state through the load dynamic switching control circuit 8 until the dynamic load response of the LDO circuit 1 to be tested is obtained through the measurement.
Specifically, the LDO circuit 1 to be tested may specifically adopt a conventional LDO circuit form, which is well known to those skilled in the art and will not be described herein again. The output end of the LDO circuit 1 to be tested and the test load circuit can provide the load requirement required by the LDO circuit 1 to be tested through the test load circuit. In the embodiment of the invention, the test load circuit is further connected with the load dynamic switching control circuit 8, the load of the test load circuit can be adjusted and switched through the load dynamic switching control circuit 8, so that the load state loaded to the LDO circuit 1 to be tested is a light load state or a heavy load state, and the dynamic load response of the LDO circuit 1 to be tested can be measured and obtained through the switching cycle of the load state of the output end of the LDO circuit 1 to be tested. The dynamic load response of the LDO circuit 1 to be tested specifically means that the LDO circuit 1 to be tested obtains corresponding voltage ripples and response time according to output waveforms in a specific heavy load state and set response time; wherein, the smaller the voltage ripple and the shorter the response time, the better the performance of the LDO circuit 1.
In specific implementation, the cycle of the load state of the output end of the LDO circuit to be tested 1 specifically refers to a switching cycle of the load state of the output end of the LDO circuit to be tested 1 between a light load state, a heavy load state, a light load state, and a heavy load state, where specific situations of the light load state and the heavy load state are related to the LDO circuit to be tested 1, and are well known to those skilled in the art, and are not described herein again. During the cycle test, the corresponding waveform can be obtained through the access or disconnection of the periodic heavy load state and the measuring equipment matched with the LDO circuit 1, and the corresponding response time, ripple voltage and the like can be determined according to the obtained waveform; the measuring device is a conventional device capable of measuring dynamic load response, and is well known in the art, and will not be described herein again.
As shown in fig. 1, the test load circuit includes a load capacitor C1, a resistor R1, and a resistor R2 connected to the output terminal of the LDO circuit to be tested 1, wherein one end of the load capacitor C1, one end of the resistor R1, and one end of the resistor R2 are connected to the output terminal of the LDO circuit to be tested 1, the other end of the load capacitor C1 and the other end of the resistor R1 are grounded, the other end of the resistor R2 is adaptively connected to the load dynamic switching control circuit 8, and the resistance value of the resistor R1 is greater than the resistance value of the resistor R2.
In the embodiment of the present invention, the specific condition of the load capacitor C1 can be selected as required, the resistor R1 generally selects a resistor with a larger resistance value, the resistor R2 selects a power resistor with a smaller resistance value, and the dynamic load switching control circuit 8 can select whether the resistor R2 is connected to the output end of the LDO circuit 1 to be tested. When the resistor R2 is connected to the output end of the LDO circuit 1 to be tested, the test load circuit can be in a heavy load state, and when the resistor R2 is not connected to the output end of the LDO circuit 1 to be tested, the test load circuit can be in a light load state.
Further, the load dynamic switching control circuit 8 comprises an active power switch K1 adaptively connected with a resistor R2 and a power switch state control circuit for controlling the switching state of the active power switch K1;
One end of an active power switch K1 is connected with the resistor R2, the other end of the active power switch K1 is grounded, and the control end of the active power switch K1 is connected with the power switch state control circuit;
the power switch state control circuit comprises an energy storage unit 7, an energy storage unit charging circuit capable of charging the energy storage unit 7, an energy storage unit discharging circuit used for amplifying the energy storage unit 7 and a charging and discharging switching circuit 2 used for controlling the charging and discharging state of the energy storage unit 7;
when the energy storage unit 7 is charged by the energy storage unit charging loop through the charging and discharging switching circuit 2, the active power switch K1 can be driven to be gradually switched on along with the gradual rise of the voltage of the energy storage unit 7 in the charging process; when the energy storage unit 7 is in a full-charge state, the voltage of the energy storage unit 7 can be used for keeping the active power switch K1 in a maximum conduction state;
when the energy storage unit discharge loop discharges the energy storage unit 7 through the charge-discharge switching circuit 2, the active power switch K1 can be driven to be gradually turned off along with the gradual voltage reduction of the energy storage unit 7 in the discharge process; when the energy storage unit 7 is in the end-of-discharge state, the active power switch K1 is in a completely off state.
In the embodiment of the present invention, the load dynamic switching control circuit 8 includes an active power switch K1, a resistor R2 is connected in an adaptive manner through the active power switch K1, and the on state or the off state of the active power switch K1 is controlled by a power switch state control circuit. When the active power switch K1 is in an on state, the resistor R2 is grounded through the active power switch K1, at this time, the resistor R2 can be connected to the output end of the LDO circuit 1 to be tested, and when the active power switch K1 is in an off state, the resistor R2 is in a floating state, and the resistor R2 cannot be connected to the output end of the LDO circuit 1 to be tested.
For the active power switch K1, the working state of the active power switch K1 changes with the change of the signal, that is, the active power switch K1 may specifically adopt a conventional common switch form, and the specific form of the active power switch K1 may be selected as needed, which is known to those skilled in the art and is not described herein again. When the active power switch K1 is turned on or off gradually, the active power switch K1 cooperates with the resistor R2 to realize that the light load state or the heavy load state is different, so that direct jump from the light load state to the heavy load state can be avoided, direct jump from the heavy load state to the light load state can also be avoided, and the reliability of a specific test process and the test precision of the LDO circuit 1 to be tested are ensured.
During specific implementation, power switch state control circuit includes energy storage unit 7, the energy storage unit charge circuit that can charge to energy storage unit 7, be used for the energy storage unit discharge circuit that energy storage unit 7 enlargies and be used for controlling the charge-discharge switching circuit 2 to energy storage unit 7 charge-discharge state, wherein, energy storage unit 7 is connected with active power switch K1's control end, change through energy storage unit 7 voltage, can control active power switch K1's on-state or off-state, energy storage unit 7 can adopt current commonly used form, if can adopt energy storage capacitor, concrete form can be selected as required, no longer describe here. The energy storage unit 7 can be charged through the energy storage unit charging circuit, and the electric energy stored in the energy storage unit 7 can be released through the energy storage unit discharging circuit.
In the embodiment of the present invention, when the active power switch K1 needs to be controlled to be turned on gradually, the charging circuit of the energy storage unit needs to be controlled to enter the working state by the charging/discharging switching circuit 2, so as to charge the energy storage unit by using the charging circuit of the energy storage unit. Specifically, when the energy storage unit 7 is charged by the energy storage unit charging loop through the charging and discharging switching circuit 2, in the charging process, the active power switch K1 can be driven to be gradually turned on along with the gradual rise of the voltage of the energy storage unit 7; when the energy storage unit 7 is in a full state, the voltage of the energy storage unit 7 can be used to keep the active power switch K1 in a maximum conduction state, as shown in fig. 2.
When the active power switch K1 needs to be controlled to turn off gradually, the energy storage unit discharge circuit needs to be controlled to enter a working state by the charge-discharge switching circuit, so as to discharge the energy storage unit 7 by the energy storage unit discharge circuit. Specifically, in the discharging process, as the voltage of the energy storage unit 7 gradually decreases, the active power switch K1 can be driven to gradually turn off; when the energy storage unit 7 is in the end-of-discharge state, the active power switch K1 is in a completely off state.
Furthermore, the energy storage unit charging circuit comprises a charging one-way switch 3 and a current-limiting charging circuit 4 which is in adaptive connection with the charging one-way switch 3, the current-limiting charging circuit 4 is connected with a charging end of the energy storage unit 7 through the charging one-way switch 3, when the energy storage unit 7 is in a full-charge state, the current-limiting charging circuit 4 stops charging the energy storage unit 7 through the charging one-way switch 3, and the conduction state of the charging one-way switch 3 can be controlled through the charging and discharging switching circuit 2;
The current-limiting charging circuit 4 comprises a constant current source I1, wherein the output end of the constant current source I1 is connected with the source end of a PMOS tube P1, the grid end of the PMOS tube P1 receives a full state feedback signal of the energy storage unit 7, the drain end of the PMOS tube P1 is connected with the grid end of an NMOS tube N1, the drain end of the NMOS tube N1 and the grid end of an NMOS tube N2, and the source end of the NMOS tube N1 and the source end of the NMOS tube N2 are grounded;
the drain end of the NMOS tube N2 is connected with the drain end of a PMOS tube P2, the grid end of a PMOS tube P2 and the grid end of a PMOS tube P3, and the source end of the PMOS tube P2, the source end of the PMOS tube P3 and the power supply end of a constant current source I1 are all connected with a power supply voltage VDD; the drain terminal of the PMOS transistor P3 can be electrically connected to the energy storage unit 7 through the charging unidirectional switch 3.
In the embodiment of the invention, the charging unidirectional switch 3 can control the unidirectional flow direction of current and prevent the energy storage unit 7 from discharging the current-limiting charging circuit 4. The charging one-way switch 3 can adopt the existing common form, such as a diode and other circuit components with the one-way switch, and can be specifically selected according to actual needs, which is not described herein again.
The operating condition of the charging one-way switch 3 is controlled by the charging and discharging switching circuit 2, when the charging one-way switch 3 is controlled by the charging and discharging switching circuit 2 to be in a conducting state or an operating state, the energy storage unit 7 can be charged by the current-limiting charging circuit 4 through the charging one-way switch 3, and when the charging one-way switch 3 is in a turn-off state, the energy storage unit 7 cannot be charged by the current-limiting charging circuit 4, meanwhile, the current-limiting charging current 4 cannot be discharged by the energy storage unit 7 through the charging one-way switch 3, and the reliability of the charging process is improved.
As shown in fig. 3, a schematic circuit diagram of the current-limiting charging circuit 4 of the present invention is shown, wherein a PMOS transistor P2 and a PMOS transistor P3 form a current mirror, an NMOS transistor N2 and an NMOS transistor N1 form the current mirror, a charging current related to the constant current source I1 can be obtained through the effect of the current mirror, the charging current can charge the energy storage unit 7 through the charging unidirectional switch 3 via a drain terminal of the PMOS transistor P3, and the specific charging current can be determined according to the size of the current mirror, which is known to those skilled in the art, and is not described herein again.
When the charging capacity of the energy storage unit 7 is determined, the charging current and the charging time of the energy storage unit 7 can be determined by configuring the current magnitude of the constant current source I1 and the details of the current mirror. The PMOS transistor P1 is a switching transistor, the PMOS transistor P1 can be gradually turned off, the gate terminal of the PMOS transistor P1 receives the full feedback signal of the energy storage unit 7, and the conventional method may be adopted to obtain the full feedback signal of the energy storage unit 7, which is known to those skilled in the art and will not be described herein again. When the gate terminal of the PMOS transistor P1 receives the full feedback signal, the entire current-limiting charging circuit 4 stops charging the energy storage unit 7 through the charging unidirectional switch 3. When the energy storage unit 7 is in the full state, the active power switch K1 is in the maximum conducting state.
Further, the energy storage unit discharging loop comprises a discharging one-way switch 6 and a current-limiting discharging circuit 5 which is in adaptive connection with the discharging one-way switch 6, the current-limiting discharging circuit 5 is connected with the discharging end of the energy storage unit 7 through the discharging one-way switch 6, when the energy storage unit 7 finishes discharging, the current-limiting discharging circuit 5 stops discharging the energy storage unit 7, and the conducting state of the discharging one-way switch 6 can be controlled through the charging and discharging switching circuit 2;
the current-limiting discharge circuit 5 comprises an NMOS tube N5 which can be in adaptive connection with the discharge unidirectional switch 6, the drain end of the NMOS tube N5 is connected with the discharge unidirectional switch 6, the grid end of the NMOS tube N5 is connected with the grid end of the NMOS tube N4 and the drain end of the NMOS tube N4, the source end of the NMOS tube N5 and the source end of the NMOS tube N4 are both grounded, and the drain end of the NMOS tube N4 is also connected with the drain end of the PMOS tube P5;
the source terminal of the PMOS transistor P5 is connected to the source terminal of the PMOS transistor P4, the gate terminal of the PMOS transistor P5 is connected to the gate terminal of the PMOS transistor P4, the drain terminal of the PMOS transistor P4 and the drain terminal of the NMOS transistor N3, the source terminal of the NMOS transistor N3 is grounded through the constant current source I2, and the gate terminal of the NMOS transistor N3 receives the release end feedback signal of the energy storage unit 7.
In the implementation of the present invention, the discharging of the energy storage unit 7 can be controlled by the discharging unidirectional switch 6, and for the specific description of the discharging unidirectional switch 6, reference may be made to the description of the charging unidirectional switch 3, which is not described herein again. When the energy storage unit 7 needs to be discharged, the discharging one-way switch 6 is controlled to be switched on through the charging and discharging switching circuit 2, after the discharging one-way switch 6 is switched on, the electric energy in the energy storage unit 7 is discharged through the discharging one-way switch 6 and the current-limiting discharging circuit 5 until the electric energy in the energy storage unit 7 is zero, namely, the electric energy is in a release ending state, and the specific discharging condition is consistent with the prior art, which is known by persons in the technical field and is not repeated herein. As can be seen from the above description, when the energy storage unit 7 discharges, the voltage of the energy storage unit 7 gradually decreases, and the active power switch K1 can be gradually turned off, and when the energy storage unit 7 is at the end of releasing, the active power switch K1 can be completely turned off, as shown in fig. 2.
As shown in fig. 4, a schematic circuit diagram of the current-limiting discharge circuit 5 is shown, in which a PMOS transistor P4 and a PMOS transistor P5 can form a current mirror, an NMOS transistor N4 and an NMOS transistor N5 can form a current mirror, and an NMOS transistor N3 is a switch transistor, and the magnitude of the discharge current can be set by the current mirror formed by the PMOS transistor P4 and the PMOS transistor P5 and the current mirror formed by the NMOS transistor N4 and the NMOS transistor N5, and the specific condition of the current mirror can be selected as needed, which is specifically known by those skilled in the art and will not be described herein again. When the gate terminal of the NMOS transistor N3 receives the release end feedback signal, the NMOS transistor N3 is turned off, and the energy storage unit 7 can stop discharging continuously, and the manner of obtaining the release end feedback of the energy storage unit 7 and loading the release end feedback to the gate terminal of the NMOS transistor N3 may be the same as the prior art, which is well known in the art and will not be described herein again.
In specific implementation, the charging and discharging switching circuit 2 includes a PWM signal generator, and when the PWM signal generated by the PWM signal generator jumps from low to high, the charging unidirectional switch 3 can be in a conducting state, and the discharging unidirectional switch 6 is in a closing state. When the PMW signal generated by the PWM signal generator jumps from high to low, the charging unidirectional switch 3 is in an off state, and the discharging unidirectional switch 6 is in an on state, as shown in fig. 2.
In summary, the test circuit for the LDO dynamic load response test can be obtained, which includes the LDO circuit 1 to be tested, the test load circuit adaptively connected to the output end of the LDO circuit 1 to be tested, and the load dynamic switching control circuit 8 adaptively connected to the test load circuit, and the load state loaded to the output end of the LDO circuit 1 to be tested by the test load circuit is in the cyclic switching process of the light load state and the heavy load state through the load dynamic switching control circuit 8 until the dynamic load response of the LDO circuit 1 to be tested is obtained through measurement.
In specific implementation, the specific situations of the LDO circuit 1 to be tested, the test load circuit, and the load dynamic switching control circuit 8 can refer to the above description, and are not described herein again.
Claims (3)
1. A high-precision assessment method suitable for LDO dynamic load response comprises an LDO circuit (1) to be tested and a test load circuit which is in adaptive connection with the output end of the LDO circuit (1) to be tested, and is characterized in that: the load dynamic switching control circuit (8) is adaptively connected with the test load circuit, and the load state loaded to the output end of the LDO circuit to be tested (1) through the test load circuit can be in a cycle switching process of a light load state and a heavy load state through the load dynamic switching control circuit (8) until the dynamic load response of the LDO circuit to be tested (1) is obtained through measurement;
The test load circuit comprises a load capacitor C1, a resistor R1 and a resistor R2 which are connected with the output end of the LDO circuit to be tested (1), wherein one end of the load capacitor C1, one end of the resistor R1 and one end of the resistor R2 are connected with the output end of the LDO circuit to be tested (1), the other end of the load capacitor C1 and the other end of the resistor R1 are grounded, the other end of the resistor R2 is in adaptive connection with a load dynamic switching control circuit (8), and the resistance value of the resistor R1 is larger than that of the resistor R2;
the load dynamic switching control circuit (8) comprises an active power switch K1 and a power switch state control circuit, wherein the active power switch K1 is in adaptive connection with a resistor R2, and the power switch state control circuit is used for controlling the switching state of an active power switch K1;
one end of an active power switch K1 is connected with the resistor R2, the other end of the active power switch K1 is grounded, and the control end of the active power switch K1 is connected with the power switch state control circuit;
the power switch state control circuit comprises an energy storage unit (7), an energy storage unit charging circuit capable of charging the energy storage unit (7), an energy storage unit discharging circuit used for discharging the energy storage unit (7) and a charging and discharging switching circuit (2) used for controlling the charging and discharging state of the energy storage unit (7);
When the energy storage unit (7) is charged by the energy storage unit charging loop through the charging and discharging switching circuit (2), the active power switch K1 can be driven to be gradually switched on along with the gradual rise of the voltage of the energy storage unit (7) in the charging process; when the energy storage unit (7) is in a full-charge state, the active power switch K1 is kept in a maximum conduction state by using the voltage of the energy storage unit (7);
when the energy storage unit discharge loop discharges the energy storage unit (7) through the charge-discharge switching circuit (2), the active power switch K1 can be driven to be gradually turned off along with the gradual reduction of the voltage of the energy storage unit (7) in the discharge process; when the energy storage unit (7) is in a discharging ending state, the active power switch K1 is in a complete turn-off state;
the energy storage unit charging circuit comprises a charging one-way switch (3) and a current-limiting charging circuit (4) which is in adaptive connection with the charging one-way switch (3), the current-limiting charging circuit (4) is connected with a charging end of the energy storage unit (7) through the charging one-way switch (3), when the energy storage unit (7) is in a full-charge state, the current-limiting charging circuit (4) stops the charging state of the energy storage unit (7) through the charging one-way switch (3), and the conduction state of the charging one-way switch (3) can be controlled through the charging and discharging switching circuit (2);
The current-limiting charging circuit (4) comprises a constant current source I1, the output end of the constant current source I1 is connected with the source end of a PMOS tube P1, the grid end of the PMOS tube P1 receives a full state feedback signal of the energy storage unit (7), the drain end of the PMOS tube P1 is connected with the grid end of an NMOS tube N1, the drain end of the NMOS tube N1 and the grid end of an NMOS tube N2, and the source end of the NMOS tube N1 and the source end of the NMOS tube N2 are grounded;
the drain end of the NMOS tube N2 is connected with the drain end of a PMOS tube P2, the grid end of a PMOS tube P2 and the grid end of a PMOS tube P3, and the source end of a PMOS tube P2, the source end of a PMOS tube P3 and the power supply end of a constant current source I1 are all connected with a power supply voltage VDD; the drain end of the PMOS pipe P3 can be electrically connected with the energy storage unit (7) through the charging unidirectional switch (3);
the energy storage unit discharging loop comprises a discharging one-way switch (6) and a current-limiting discharging circuit (5) which is in adaptive connection with the discharging one-way switch (6), the current-limiting discharging circuit (5) is connected with the discharging end of the energy storage unit (7) through the discharging one-way switch (6), when the energy storage unit (7) finishes discharging, the current-limiting discharging circuit (5) stops discharging the energy storage unit (7), and the conducting state of the discharging one-way switch (6) can be controlled through the charging and discharging switching circuit (2);
The current-limiting discharge circuit (5) comprises an NMOS tube N5 which can be in adaptive connection with a discharge unidirectional switch (6), the drain end of the NMOS tube N5 is connected with the discharge unidirectional switch (6), the grid end of the NMOS tube N5 is connected with the grid end of the NMOS tube N4 and the drain end of the NMOS tube N4, the source end of the NMOS tube N5 and the source end of the NMOS tube N4 are both grounded, and the drain end of the NMOS tube N4 is also connected with the drain end of the PMOS tube P5;
the source end of the PMOS tube P5 is connected with the source end of the PMOS tube P4, the gate end of the PMOS tube P5 is connected with the gate end of the PMOS tube P4, the drain end of the PMOS tube P4 and the drain end of the NMOS tube N3, the source end of the NMOS tube N3 is grounded through a constant current source I2, and the gate end of the NMOS tube N3 receives a release ending feedback signal of the energy storage unit (7).
2. The method of claim 1, wherein the method is applied to high-precision estimation of the LDO dynamic load response, and comprises the following steps: the charge-discharge switching circuit (2) comprises a PWM signal generator.
3. A high-precision evaluation circuit suitable for LDO dynamic load response, for implementing the evaluation method of claim 1, comprising a LDO circuit (1) to be tested and a test load circuit adaptively connected to an output of the LDO circuit (1) to be tested, characterized in that: the load dynamic switching control circuit (8) is adaptively connected with the test load circuit, and the load state loaded to the output end of the LDO circuit to be tested (1) through the test load circuit can be in a cycle switching process of a light load state and a heavy load state through the load dynamic switching control circuit (8) until the dynamic load response of the LDO circuit to be tested (1) is obtained through measurement;
The test load circuit comprises a load capacitor C1, a resistor R1 and a resistor R2 which are connected with the output end of the LDO circuit to be tested (1), wherein one end of the load capacitor C1, one end of the resistor R1 and one end of the resistor R2 are connected with the output end of the LDO circuit to be tested (1), the other end of the load capacitor C1 and the other end of the resistor R1 are grounded, the other end of the resistor R2 is in adaptive connection with a load dynamic switching control circuit (8), and the resistance value of the resistor R1 is larger than that of the resistor R2;
the load dynamic switching control circuit (8) comprises an active power switch K1 and a power switch state control circuit, wherein the active power switch K1 is in adaptive connection with a resistor R2, and the power switch state control circuit is used for controlling the switching state of an active power switch K1;
one end of an active power switch K1 is connected with the resistor R2, the other end of the active power switch K1 is grounded, and the control end of the active power switch K1 is connected with the power switch state control circuit;
the power switch state control circuit comprises an energy storage unit (7), an energy storage unit charging circuit capable of charging the energy storage unit (7), an energy storage unit discharging circuit used for amplifying the energy storage unit (7) and a charging and discharging switching circuit (2) used for controlling the charging and discharging state of the energy storage unit (7);
When the energy storage unit (7) is charged by the energy storage unit charging loop through the charging and discharging switching circuit (2), the active power switch K1 can be driven to be gradually switched on along with the gradual rise of the voltage of the energy storage unit (7) in the charging process; when the energy storage unit (7) is in a full-charge state, the active power switch K1 is kept in a maximum conduction state by using the voltage of the energy storage unit (7);
when the energy storage unit discharge loop discharges the energy storage unit (7) through the charge-discharge switching circuit (2), the active power switch K1 can be driven to be gradually turned off along with the gradual reduction of the voltage of the energy storage unit (7) in the discharge process; when the energy storage unit (7) is in a discharging ending state, the active power switch K1 is in a complete turn-off state;
the energy storage unit charging circuit comprises a charging one-way switch (3) and a current-limiting charging circuit (4) which is in adaptive connection with the charging one-way switch (3), the current-limiting charging circuit (4) is connected with a charging end of the energy storage unit (7) through the charging one-way switch (3), when the energy storage unit (7) is in a full-charge state, the current-limiting charging circuit (4) stops the charging state of the energy storage unit (7) through the charging one-way switch (3), and the conduction state of the charging one-way switch (3) can be controlled through the charging and discharging switching circuit (2);
The energy storage unit discharge loop comprises a discharge one-way switch (6) and a current-limiting discharge circuit (5) which is connected with the discharge one-way switch (6) in an adaptive mode, the current-limiting discharge circuit (5) is connected with the discharge end of the energy storage unit (7) through the discharge one-way switch (6), when the energy storage unit (7) discharges, the current-limiting discharge circuit (5) stops discharging the energy storage unit (7), and the conduction state of the discharge one-way switch (6) can be controlled through a charge-discharge switching circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111048908.6A CN113740653B (en) | 2021-09-08 | 2021-09-08 | High-precision evaluation method and circuit suitable for LDO dynamic load response |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111048908.6A CN113740653B (en) | 2021-09-08 | 2021-09-08 | High-precision evaluation method and circuit suitable for LDO dynamic load response |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113740653A CN113740653A (en) | 2021-12-03 |
| CN113740653B true CN113740653B (en) | 2022-07-29 |
Family
ID=78737057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111048908.6A Active CN113740653B (en) | 2021-09-08 | 2021-09-08 | High-precision evaluation method and circuit suitable for LDO dynamic load response |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113740653B (en) |
Citations (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4369407A (en) * | 1979-08-29 | 1983-01-18 | Sheller-Globe Corporation | Regulator tester |
| DE3778859D1 (en) * | 1986-12-23 | 1992-06-11 | Ibm | FUNCTIONAL FORECASTING. |
| CN1960121A (en) * | 2005-11-04 | 2007-05-09 | 中国科学院电工研究所 | Charging / discharging voltage equilibrium device of super capacitor module |
| CN200996991Y (en) * | 2007-01-26 | 2007-12-26 | 北京锐安科技有限公司 | Switch power-supply tester |
| CN101330266A (en) * | 2007-06-20 | 2008-12-24 | 株式会社东海理化电机制作所 | Load drive control circuit |
| CN101452060A (en) * | 2007-11-30 | 2009-06-10 | 上海市电力公司 | UPS dynamic test method |
| WO2013015244A1 (en) * | 2011-07-27 | 2013-01-31 | 三菱電機株式会社 | Secondary battery charging control device and charging control method |
| CN103105883A (en) * | 2011-11-11 | 2013-05-15 | 中国科学院微电子研究所 | Linear voltage regulator with load detection circuit and dynamic zero compensation circuit |
| CN103197170A (en) * | 2013-03-01 | 2013-07-10 | 深圳创维数字技术股份有限公司 | Test method, test device, control device and system of voltage stabilizer |
| CN103532366A (en) * | 2013-09-26 | 2014-01-22 | 深圳市三旺通信技术有限公司 | Starting method and starting circuit of direct-current power supply |
| CN103779838A (en) * | 2014-01-26 | 2014-05-07 | 深圳天源中芯半导体有限公司 | Switching power supply management circuit system |
| CN103828314A (en) * | 2011-09-23 | 2014-05-28 | 高通股份有限公司 | Load detecting impedance matching buffer |
| TW201509099A (en) * | 2013-08-28 | 2015-03-01 | Hon Hai Prec Ind Co Ltd | Switching power supply device and method for improving conversion efficiency thereof |
| CN105305388A (en) * | 2014-07-28 | 2016-02-03 | 倍加福有限责任公司 | Method and device for monitoring and switching a load circuit |
| CN205611031U (en) * | 2016-05-10 | 2016-09-28 | 深圳市博莱凯半导体照明有限公司 | Illumination lamp driving circuit with function of gradually going out |
| EP3125391A1 (en) * | 2014-04-29 | 2017-02-01 | Mitsubishi Electric Corporation | Power switch device and system using same |
| CN106908742A (en) * | 2015-12-18 | 2017-06-30 | 技嘉科技股份有限公司 | Power supply testing device and method |
| CN206546421U (en) * | 2017-03-07 | 2017-10-10 | 新华三技术有限公司 | A kind of load blocks and test system |
| CN108051683A (en) * | 2017-12-26 | 2018-05-18 | 四川福润得数码科技有限责任公司 | A kind of load is switched in or out detection circuit and power supply power-supplying circuit and control method |
| CN108322081A (en) * | 2018-03-09 | 2018-07-24 | 青海大学 | High-voltage pulse output circuit, method and tail gas remove equipment |
| JP2018120987A (en) * | 2017-01-26 | 2018-08-02 | 三菱電機株式会社 | Capacitor test device |
| CN108710399A (en) * | 2018-04-25 | 2018-10-26 | 电子科技大学 | A kind of LDO circuit with high transient response |
| WO2019114304A1 (en) * | 2017-12-14 | 2019-06-20 | 蔚来汽车有限公司 | Starting power supply device and method for mobile charging vehicle |
| CN110086217A (en) * | 2019-03-29 | 2019-08-02 | 浙江威星智能仪表股份有限公司 | A kind of circuit improving LDO transient response |
| CN110165743A (en) * | 2019-06-06 | 2019-08-23 | 深圳市思远半导体有限公司 | Automatic load detection circuit and automatic load detection method |
| CN111290472A (en) * | 2020-02-25 | 2020-06-16 | 江苏润石科技有限公司 | Low dropout regulator with fast response |
| CN112039508A (en) * | 2020-08-22 | 2020-12-04 | 深圳市海曼科技股份有限公司 | Long-delay reset circuit |
| CN112506260A (en) * | 2020-12-25 | 2021-03-16 | 唐太平 | Load current switching quick response LDO circuit |
| CN112924778A (en) * | 2021-01-25 | 2021-06-08 | 广东机电职业技术学院 | Tester and testing method for reliability of electric appliance |
| CN113359921A (en) * | 2021-06-22 | 2021-09-07 | 无锡力芯微电子股份有限公司 | Linear voltage regulator with fast transient response operation capability |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005242215A (en) * | 2004-02-27 | 2005-09-08 | Alps Electric Co Ltd | Load capacity driving circuit and liquid crystal driving circuit |
| JP2016025801A (en) * | 2014-07-23 | 2016-02-08 | 株式会社東芝 | Power-supply circuit |
-
2021
- 2021-09-08 CN CN202111048908.6A patent/CN113740653B/en active Active
Patent Citations (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4369407A (en) * | 1979-08-29 | 1983-01-18 | Sheller-Globe Corporation | Regulator tester |
| DE3778859D1 (en) * | 1986-12-23 | 1992-06-11 | Ibm | FUNCTIONAL FORECASTING. |
| CN1960121A (en) * | 2005-11-04 | 2007-05-09 | 中国科学院电工研究所 | Charging / discharging voltage equilibrium device of super capacitor module |
| CN200996991Y (en) * | 2007-01-26 | 2007-12-26 | 北京锐安科技有限公司 | Switch power-supply tester |
| CN101330266A (en) * | 2007-06-20 | 2008-12-24 | 株式会社东海理化电机制作所 | Load drive control circuit |
| CN101452060A (en) * | 2007-11-30 | 2009-06-10 | 上海市电力公司 | UPS dynamic test method |
| WO2013015244A1 (en) * | 2011-07-27 | 2013-01-31 | 三菱電機株式会社 | Secondary battery charging control device and charging control method |
| CN103828314A (en) * | 2011-09-23 | 2014-05-28 | 高通股份有限公司 | Load detecting impedance matching buffer |
| CN103105883A (en) * | 2011-11-11 | 2013-05-15 | 中国科学院微电子研究所 | Linear voltage regulator with load detection circuit and dynamic zero compensation circuit |
| CN103197170A (en) * | 2013-03-01 | 2013-07-10 | 深圳创维数字技术股份有限公司 | Test method, test device, control device and system of voltage stabilizer |
| TW201509099A (en) * | 2013-08-28 | 2015-03-01 | Hon Hai Prec Ind Co Ltd | Switching power supply device and method for improving conversion efficiency thereof |
| CN103532366A (en) * | 2013-09-26 | 2014-01-22 | 深圳市三旺通信技术有限公司 | Starting method and starting circuit of direct-current power supply |
| CN103779838A (en) * | 2014-01-26 | 2014-05-07 | 深圳天源中芯半导体有限公司 | Switching power supply management circuit system |
| EP3125391A1 (en) * | 2014-04-29 | 2017-02-01 | Mitsubishi Electric Corporation | Power switch device and system using same |
| CN105305388A (en) * | 2014-07-28 | 2016-02-03 | 倍加福有限责任公司 | Method and device for monitoring and switching a load circuit |
| CN106908742A (en) * | 2015-12-18 | 2017-06-30 | 技嘉科技股份有限公司 | Power supply testing device and method |
| CN205611031U (en) * | 2016-05-10 | 2016-09-28 | 深圳市博莱凯半导体照明有限公司 | Illumination lamp driving circuit with function of gradually going out |
| JP2018120987A (en) * | 2017-01-26 | 2018-08-02 | 三菱電機株式会社 | Capacitor test device |
| CN206546421U (en) * | 2017-03-07 | 2017-10-10 | 新华三技术有限公司 | A kind of load blocks and test system |
| WO2019114304A1 (en) * | 2017-12-14 | 2019-06-20 | 蔚来汽车有限公司 | Starting power supply device and method for mobile charging vehicle |
| CN108051683A (en) * | 2017-12-26 | 2018-05-18 | 四川福润得数码科技有限责任公司 | A kind of load is switched in or out detection circuit and power supply power-supplying circuit and control method |
| CN108322081A (en) * | 2018-03-09 | 2018-07-24 | 青海大学 | High-voltage pulse output circuit, method and tail gas remove equipment |
| CN108710399A (en) * | 2018-04-25 | 2018-10-26 | 电子科技大学 | A kind of LDO circuit with high transient response |
| CN110086217A (en) * | 2019-03-29 | 2019-08-02 | 浙江威星智能仪表股份有限公司 | A kind of circuit improving LDO transient response |
| CN110165743A (en) * | 2019-06-06 | 2019-08-23 | 深圳市思远半导体有限公司 | Automatic load detection circuit and automatic load detection method |
| CN111290472A (en) * | 2020-02-25 | 2020-06-16 | 江苏润石科技有限公司 | Low dropout regulator with fast response |
| CN112039508A (en) * | 2020-08-22 | 2020-12-04 | 深圳市海曼科技股份有限公司 | Long-delay reset circuit |
| CN112506260A (en) * | 2020-12-25 | 2021-03-16 | 唐太平 | Load current switching quick response LDO circuit |
| CN112924778A (en) * | 2021-01-25 | 2021-06-08 | 广东机电职业技术学院 | Tester and testing method for reliability of electric appliance |
| CN113359921A (en) * | 2021-06-22 | 2021-09-07 | 无锡力芯微电子股份有限公司 | Linear voltage regulator with fast transient response operation capability |
Non-Patent Citations (1)
| Title |
|---|
| 压电式微位移定位机构驱动电源的硬件设计;岳晓许 等;《河南科技》;20141225(第12期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113740653A (en) | 2021-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8362748B2 (en) | Voltage comparison circuit | |
| US11996714B2 (en) | Battery charger | |
| US20130063110A1 (en) | Fast startup algorithm for low noise power management | |
| CN103795239A (en) | Apparatus and method for controlling inductor current in a switch mode power supply | |
| CN107834857B (en) | Power supply control device and insulated switching power supply device | |
| CN113825279B (en) | LED driving system and driving method thereof | |
| CN110875686A (en) | Electronic converter and method of operating an electronic converter | |
| CN110138220B (en) | Power supply and switching power supply circuit thereof | |
| US7894717B2 (en) | Control circuit for self exciting DC/DC converter | |
| US20170117730A1 (en) | Efficient supercapacitor charging technique by a hysteretic charging scheme | |
| CN203522533U (en) | Power supply system and inductor current simulating circuit of power supply | |
| WO2018215741A1 (en) | A dc-dc converter | |
| KR101152476B1 (en) | charger and discharer for secondary battery | |
| CN113740653B (en) | High-precision evaluation method and circuit suitable for LDO dynamic load response | |
| CN103701312A (en) | Current limiting circuit and method of boost converter | |
| US6225782B1 (en) | Method and apparatus for hi-Z mode battery charging | |
| CN109932664B (en) | Switching circuit for electronic load short-circuit mode and control method | |
| KR101447425B1 (en) | Charging-Discharging System for Secondary Battery Having Improved Energy Efficiency | |
| CN115902561A (en) | Avalanche tolerance test circuit and test method thereof | |
| WO2019113588A1 (en) | Buck-boost power converter controller | |
| KR101822039B1 (en) | Power Converter For Improving Speed of Blocking Inductor Current | |
| CN114325285A (en) | SiC MOSFET (metal oxide semiconductor field effect transistor) repeated short circuit test method with adjustable gate voltage structure | |
| CN111381143B (en) | RBDT dynamic characteristic testing device and testing method | |
| US11081960B2 (en) | Timer for power converter controller | |
| CN113567840B (en) | High-precision detection method and circuit for dynamic response of power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |