CN111342656A - Load current switching current slew rate control circuit and method in energy-feedback type electronic load - Google Patents

Load current switching current slew rate control circuit and method in energy-feedback type electronic load Download PDF

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Publication number
CN111342656A
CN111342656A CN202010201425.4A CN202010201425A CN111342656A CN 111342656 A CN111342656 A CN 111342656A CN 202010201425 A CN202010201425 A CN 202010201425A CN 111342656 A CN111342656 A CN 111342656A
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load
switch
power supply
boost
current
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CN111342656B (en
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苏淑靖
王少斌
谭秋林
沈三民
王红亮
张彦军
马游春
崔永俊
张会新
侯钰龙
熊继军
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North University of China
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • G01R31/40—Testing power supplies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

Abstract

The invention belongs to the field of power supply testing, and discloses a load current switching current slew rate control circuit and method in an energy-feedback type electronic load, wherein the circuit comprises an input inductor, a load simulation circuit, an auxiliary bidirectional buck-boost type power supply, a first switch Q1 and a second switch Q2; the positive end of a tested power supply is connected with one side of the input inductor, the other side of the input inductor is connected with one sides of the first switch Q1 and the second switch Q2, the other side of the first switch Q1 is connected with the positive end of the input side of the load analog circuit, the other side of the second switch Q2 is connected with the positive end of the auxiliary bidirectional buck-boost power supply in the first direction, the negative end of the tested power supply is connected with the negative end of the auxiliary bidirectional buck-boost power supply in the first direction and the negative end of the input side of the load analog circuit, and the positive end and the negative end of the output side of the load analog circuit are respectively connected with the positive end and the negative end of the auxiliary bidirectional buck-boost power supply in the. The invention has the advantages of reliable performance, easy control and the like.

Description

Load current switching current slew rate control circuit and method in energy-feedback type electronic load
Technical Field
The invention belongs to the field of power supply testing, and particularly relates to a load current switching current slew rate control circuit and method in an energy-feedback electronic load.
Background
In recent years, with the increasing importance of energy utilization and consumption in China and the gradual improvement of energy-saving and environment-friendly consciousness of people, although the traditional energy consumption type electronic load has high precision and small ripple, the energy of the load is basically consumed in a vacant way, and the energy-saving requirement of people is difficult to meet. The advantage of the energy-fed electronic load that the self-consumption is small and the load efficiency is high gradually comes forward, but for some special occasions such as a power supply test system with small ripple and high dynamic performance, the conventional energy-fed sub-load device is difficult to meet the requirement, which needs to mainly solve the contradiction between the low ripple and the high slew rate of the energy-fed sub-load. In addition, when a power supply dynamic characteristic test is performed, the electronic load needs to work in a sequence mode, the load which needs to be changed by the analog power supply is quickly responded, and if the load current is quickly switched by quickly switching the switch, larger electromagnetic radiation is generated, so that the electromagnetic compatibility is poor.
The traditional method for controlling the slew rate of the energy-feedback electronic load is to adjust the input inductance current to deal with the large jump of the input voltage, and because the ripple wave control precision of the inductance to the current is high, the control precision of the slew rate is reduced, and vice versa, the control of the ripple wave and the slew rate is always in a compromise mode. The invention develops a load current switching current slew rate controllable method aiming at a feed-able electronic load, converts the traditional input inductance current control into intermediate voltage control, the voltage of an intermediate node can be smoothed by a certain capacitor, and the topology that the control ripple wave does not depend on the input inductance is used, thereby realizing the control of input current switching and current slew rate and achieving the aim of decoupling the ripple wave and slew rate. The load current switching current slew rate control method provided by the invention has a wide application prospect in the design aspect of high-performance energy-fed electronic loads.
Disclosure of Invention
The invention provides a load current switching current slew rate control circuit and a method, aiming at improving simulated ripple and dynamic response indexes of an energy-fed electronic load, reducing electromagnetic interference and improving the performance of the energy-fed electronic load.
In order to solve the technical problems, the invention adopts the technical scheme that: a load current switching current slew rate control circuit in an energy feedback type electronic load comprises a load simulation module and a current slew rate control module, wherein the load simulation module comprises an input inductor L and a load simulation circuit, and the current slew rate control module comprises an auxiliary bidirectional buck-boost type power supply, a first switch Q1 and a second switch Q2;
the positive end of a tested power supply is connected with one side of the input inductor, the other side of the input inductor is connected with one sides of the first switch Q1 and the second switch Q2, the other side of the first switch Q1 is connected with the positive end of the input side of the load analog circuit, the other side of the second switch Q2 is connected with the positive end of the auxiliary bidirectional buck-boost power supply in the first direction, the negative end of the tested power supply is connected with the negative end of the auxiliary bidirectional buck-boost power supply in the first direction and the negative end of the input side of the load analog circuit, the positive end and the negative end of the output side of the load analog circuit are respectively connected with the positive end and the negative end of the auxiliary bidirectional buck-boost power supply in the second direction, and the output side of the load analog circuit.
Furthermore, the load simulation circuit is composed of a six-phase full-bridge Buck-boost circuit module which is composed of six-phase full-bridge Buck-boost circuit modulesThe block comprises six full-bridge Buck-boost circuits connected in parallel, each full-bridge Buck-boost circuit comprising a power switch tube Sn1、Sn2、Sn3、Sn4Equivalent filter capacitor C2Equivalent output filter capacitor C0Energy storage inductor LnAnd an anti-parallel diode Dn1、Dn2、Dn3、Dn4Wherein n =1,2,3,4,5, 6; the equivalent filter capacitor C2Connected in parallel between the positive terminal of the input side and the negative terminal of the input side of the six-phase full-bridge Buck-boost circuit module, and the equivalent output filter capacitor C0And the six-phase full-bridge Buck-boost circuit module is connected between the positive end and the negative end of the output side of the six-phase full-bridge Buck-boost circuit module in parallel.
Furthermore, the auxiliary bidirectional Buck-boost power supply consists of a single-phase full-bridge Buck-boost circuit module and comprises a power switch tube S1、S2、S3、S4Equivalent filter capacitor C1Equivalent output filter capacitor C0Energy storage inductor L0And an anti-parallel diode D1、D2、D3、D4Equivalent filter capacitor C1Connected in parallel between the first direction positive terminal and the first direction negative terminal of the single-phase full-bridge Buck-boost circuit module, and equivalent output filter capacitor C0And the parallel connection is carried out between the positive and negative ends of the second direction of the single-phase full-bridge Buck-boost circuit module.
In addition, the invention also provides a load current switching current slew rate control method in the energy-fed electronic load, which is realized by adopting the load current switching current slew rate control circuit in the energy-fed electronic load, and the load current switching current slew rate control circuit is realized by controlling the on and off of the first switch Q1 and the second switch Q2 and adjusting the voltage value of the auxiliary bidirectional buck-boost power supply in the first direction to meet the following requirements:
Figure DEST_PATH_IMAGE002
thereby realizing the control of the current slew rate, wherein,
Figure DEST_PATH_IMAGE004
is the current slew rate, V is the voltage value of the power supply to be measured, V2To assist in both directionsThe voltage value of the first direction of the voltage boosting type power supply, and L represents the inductance value of the input inductor.
Further, the control method of the load current switching current slew rate in the energy-feedback type electronic load comprises a control method of the current slew rate when the load current is increased and a control method of the current slew rate when the load current is reduced;
the control method of the current slew rate when the load current is increased comprises the following steps: changing the voltage value of the auxiliary bidirectional buck-boost power supply in the first direction according to the required current slew rate, then disconnecting the first switch Q1, and switching on the second switch Q2 to enable the load simulation circuit to work in a follow current state; when the current value of the required load is close, the first switch Q1 is switched on, and the second switch Q2 is switched off, so that the load simulation circuit works in an energy conversion state and is restored to a stable working state;
the control method of the current slew rate when the load current is reduced comprises the following steps: changing the voltage value of the auxiliary bidirectional buck-boost type power supply in the first direction according to the required current slew rate, disconnecting the first switch Q1, and connecting the second switch Q2, wherein the load simulation circuit works in a follow current state, and the load current changes at the rate of the ratio of the voltage difference value of the voltage of the tested power supply and the auxiliary bidirectional buck-boost type power supply in the first direction to the input inductance value; when the required load current value is approached, the first switch Q1 is turned on, the second switch Q2 is turned off, and the load simulation circuit works in an energy conversion state and returns to a stable working state.
Further, the voltage value of the first direction of the auxiliary bidirectional Buck-boost power supply is controlled by changing the duty ratio of a single-phase full-bridge Buck-boost circuit module in the auxiliary bidirectional Buck-boost power supply.
Compared with the prior art, the invention has the following beneficial effects: the invention has the advantages of reliable performance, high efficiency, simplicity and convenience, easy control and the like, converts the traditional control of the slew rate of the input inductive current into the control of the intermediate node voltage, realizes the controllability of the current slew rate, and improves the simulation precision and dynamic response of the energy-feedback electronic load.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a load current switching current slew rate control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a load current switching current slew rate control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an equivalent structure of a load current switching current slew rate control circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a load current switching current slew rate control circuit structure in an energy-fed electronic load, including a load simulation module and a current slew rate control module, where the load simulation module includes a measured power supply, an input inductor L, and a load simulation circuit, and the current slew rate control module includes an auxiliary bidirectional buck-boost power supply, a first switch Q1, and a second switch Q2; the positive end of a tested power supply is connected with one side of the input inductor, the other side of the input inductor L is connected with one sides of the first switch Q1 and the second switch Q2, the other side of the first switch Q1 is connected with the positive end of the input side of the load analog circuit, the other side of the second switch Q2 is connected with the positive end of the auxiliary bidirectional buck-boost power supply in the first direction, the negative end of the tested power supply is connected with the negative end of the auxiliary bidirectional buck-boost power supply in the first direction and the negative end of the input side of the load analog circuit, the positive end and the negative end of the output side of the load analog circuit are respectively connected with the positive end and the negative end of the auxiliary bidirectional buck-boost power supply in the second direction, and the output side of the load analog circuit.
Specifically, as shown in fig. 2, the load simulation circuit is formed by a six-phase full-bridge Buck-boost circuit module, the six-phase full-bridge Buck-boost circuit module includes six full-bridge Buck-boost circuits connected in parallel, and each full-bridge Buck-boost circuit includes a power switch tube Sn1、Sn2、Sn3、Sn4Equivalent input filter capacitor C2Equivalent output filter capacitor C0Energy storage inductor LnAnd an anti-parallel diode Dn1、Dn2、Dn3、Dn4Wherein n =1,2,3,4,5, 6; equivalent filter capacitor C2Connected in parallel between the positive terminal of the input side and the negative terminal of the input side of the six-phase full-bridge Buck-boost circuit module, and equivalent output filter capacitor C0And the six-phase full-bridge Buck-boost circuit module is connected between the positive end and the negative end of the output side of the six-phase full-bridge Buck-boost circuit module in parallel.
Specifically, the auxiliary bidirectional Buck-boost power supply is composed of a single-phase full-bridge Buck-boost circuit module and comprises a power switch tube S1、S2、S3、S4Equivalent filter capacitor C1Equivalent output filter capacitor C0Energy storage inductor L0And an anti-parallel diode D1、D2、D3、D4Equivalent filter capacitor C1Connected in parallel between the first direction positive terminal and the first direction negative terminal of the single-phase full-bridge Buck-boost circuit module, and equivalent output filter capacitor C0And the parallel connection is carried out between the positive and negative ends of the second direction of the single-phase full-bridge Buck-boost circuit module.
The positive end of the power supply to be tested is connected with one side of an input inductor L, and the other side of the input inductor L is connected with a first switch Q1And a second switch Q2Connected common side, Q1Is connected with the positive end of the input side of the load analog circuit, namely with the equivalent input filter capacitor C2Positive terminal, power switch tube Sn1Drain connection of (2), power switch tube Sn1And a power switch tube Sn2Form a half-bridge arm, the middle point of the arm and an energy storage inductor LnIs connected to one side of an energy storage inductor LnThe other side of the power switch tube Sn3And a power switch tube Sn4The middle points of the formed half-bridge arms are connected; q2And the other side of the auxiliary bidirectional buck-boost power supply is connected with the positive end of the first direction of the auxiliary bidirectional buck-boost power supply, namely the equivalent input filter capacitor C1Positive terminal, power switch tube S1Drain connection of (2), power switch tube S1And a power switch tube S2Form a half-bridge arm, the middle point of the arm and an energy storage inductor L0Is connected to one side of an energy storage inductor L0And a power switch tube S3And a power switch tube S4The middle points of the formed half-bridge arms are connected; equivalent output filter capacitor C0And a power switching tube S3And a power switch tube S4The upper end of the half-bridge arm and the power switch tube Sn3And a power switch tube Sn4The upper ends of the formed half-bridge arms are connected; the negative end of the tested power supply, the negative end of the auxiliary bidirectional buck-boost type power supply in the first direction, the negative end of the input side of the load simulation circuit and the equivalent output filter capacitor C0Is connected with the negative terminal of the power supply; the positive end and the negative end of the output side of the load simulation circuit are respectively connected with the positive end and the negative end of the auxiliary bidirectional buck-boost power supply in the second direction; load-simulating circuit output side, i.e. equivalent output filter capacitor C0The voltage across (2) is recorded as the dc bus voltage. As shown in FIG. 2, the voltage value of the power supply V to be measured is 150V, the rated voltage value of the direct current bus is 85V, the input inductance L is 70uH, and the current slew rate is 1A/us.
To more clearly illustrate the control principle of the load current switching current slew rate control circuit in the energy-fed electronic load provided by the present invention, as shown in fig. 3, the voltage of the power source to be tested is constant, and the current flowing out of the power source to be tested, i.e. the current I input into the inductor, is required to be constantLFast switching, the load simulation circuit can be equivalent to a current source I0Will be inputted into the current I in the inductorLAnd an equivalent current source I0Switching in synchronism, i.e. simultaneously with the capacitor C1Open, capacitance C1The voltage on the input inductor does not change, so that the input inductor and the equivalent current source are respectively controlled to switch when the current I in the input inductorLAfter the target value is reached, the current value of the equivalent current source tracks the current value in the input inductor to change.
The invention further provides a method for controlling the load current switching current slew rate in the energy-fed electronic load, which is realized by adopting the circuit for controlling the load current switching current slew rate in the energy-fed electronic load, and the method realizes the control of the current slew rate by controlling the on and off of the first switch Q1 and the second switch Q2 and adjusting the voltage value of the auxiliary bidirectional buck-boost power supply in the first direction.
Specifically, the current slew rate is determined by the following formula:
Figure 288952DEST_PATH_IMAGE002
； （1）
wherein the content of the first and second substances,
Figure 206092DEST_PATH_IMAGE004
is the current slew rate, V is the voltage value of the power supply to be measured, V2In order to assist the voltage value of the first direction of the bidirectional buck-boost power supply, L is an input inductance value. Therefore, the current slew rate can be controlled by adjusting the voltage value of the auxiliary bidirectional buck-boost power supply in the first direction.
Further, the method for controlling load current switching current slew rate in an energy-fed electronic load provided by this embodiment specifically includes a method for controlling current slew rate when load current increases and a method for controlling current slew rate when load current decreases.
When the load current is not changed, the first switch Q1Conducting, second switch Q2And when the electronic load is disconnected, the electronic load works in a stable working state.
When the load current needs to be increased, such as from 20A to 30A, the duty ratio of the single-phase full-bridge Buck-boost circuit is changed according to the required current swing rate, and the voltage value of the auxiliary bidirectional Buck-boost power supply in the first direction is obtained to be 80V; disconnect the first switch Q1Turn on the second switch Q2The load simulation circuit works in a follow current state, and the load current changes at the rate of the ratio of the voltage difference value of the voltage of the power supply to be measured and the auxiliary bidirectional buck-boost power supply in the first direction to the input inductor L; when the required load current value is close to 30A, Q is turned on1Disconnect Q2And the load simulation circuit works in an energy conversion state and is recovered to a stable working state.
When the load current needs to be reduced, such as from 20A to 10A, the duty ratio of the single-phase full-bridge Buck-boost circuit is changed according to the required current swing rate to obtain the required current swing rate220V; disconnect the first switch Q1Turn on the second switch Q2The load simulation circuit works in a follow current state, and the load current changes at the rate of the ratio of the voltage difference value of the voltage of the tested power supply and the first direction of the auxiliary bidirectional buck-boost power supply to the input inductance value; when the required load current value 10A is approached, Q is turned on1Disconnect Q2And the load simulation circuit works in an energy conversion state and is recovered to a stable working state.
Specifically, the auxiliary bidirectional buck-boost power supply obtains energy from the voltage of the direct-current bus, the duty ratio of the auxiliary bidirectional buck-boost power supply is changed through control during load current switching, and controllable auxiliary node voltage, namely the voltage value V of the first direction of the auxiliary bidirectional buck-boost power supply, is generated2(ii) a Auxiliary node voltage and voltage V at input side of load analog circuit1Is irrelevant.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A load current switching current slew rate control circuit in an energy feedback type electronic load is characterized by comprising a load simulation module and a current slew rate control module, wherein the load simulation module comprises an input inductor L and a load simulation circuit, and the current slew rate control module comprises an auxiliary bidirectional buck-boost type power supply, a first switch Q1 and a second switch Q2;
the positive end of a tested power supply is connected with one side of the input inductor, the other side of the input inductor is connected with one sides of the first switch Q1 and the second switch Q2, the other side of the first switch Q1 is connected with the positive end of the input side of the load analog circuit, the other side of the second switch Q2 is connected with the positive end of the auxiliary bidirectional buck-boost power supply in the first direction, the negative end of the tested power supply is connected with the negative end of the auxiliary bidirectional buck-boost power supply in the first direction and the negative end of the input side of the load analog circuit, the positive end and the negative end of the output side of the load analog circuit are respectively connected with the positive end and the negative end of the auxiliary bidirectional buck-boost power supply in the second direction, and the output side of the load analog circuit.
2. The circuit of claim 1, wherein the load simulation circuit is a six-phase full-bridge Buck-boost circuit module comprising six parallel-connected full-bridge Buck-boost circuits, each full-bridge Buck-boost circuit comprising a power switch tube Sn1、Sn2、Sn3、Sn4Equivalent input filter capacitor C2Equivalent output filter capacitor C0Energy storage inductor LnAnd an anti-parallel diode Dn1、Dn2、Dn3、Dn4Wherein n =1,2,3,4,5, 6; the equivalent filter capacitor C2Connected in parallel between the positive terminal of the input side and the negative terminal of the input side of the six-phase full-bridge Buck-boost circuit module, and the equivalent output filter capacitor C0And the six-phase full-bridge Buck-boost circuit module is connected between the positive end and the negative end of the output side of the six-phase full-bridge Buck-boost circuit module in parallel.
3. The circuit of claim 1, wherein the auxiliary bidirectional Buck-boost power supply comprises a single-phase full-bridge Buck-boost circuit module including a power switch tube S1、S2、S3、S4Equivalent filter capacitor C1Equivalent output filter capacitor C0Energy storage inductor L0And an anti-parallel diode D1、D2、D3、D4Said equivalent filter capacitor C1The equivalent output filter capacitor C is connected between the first direction positive end and the first direction negative end of the single-phase full-bridge Buck-boost circuit module in parallel0Connected in parallel to the single phaseAnd the positive and negative ends of the second direction of the full-bridge Buck-boost circuit module.
4. A load current switching current slew rate control method in an energy-fed electronic load is realized by adopting the load current switching current slew rate control circuit in the energy-fed electronic load as claimed in any one of claims 1 to 3, and is characterized in that the switching of the first switch Q1 and the second switch Q2 is controlled, and the voltage value of the auxiliary bidirectional buck-boost type power supply in the first direction is adjusted to meet the following requirements:
Figure DEST_PATH_IMAGE001
thereby realizing the control of the current slew rate, wherein,
Figure 593374DEST_PATH_IMAGE002
is the current slew rate, V is the voltage value of the power supply to be measured, V2To assist the voltage value in the first direction of the bidirectional buck-boost power supply, L represents the inductance value of the input inductor.
5. The method for controlling the load current switching current slew rate in the energy-fed electronic load according to claim 4, wherein the method comprises a method for controlling the current slew rate when the load current increases and a method for controlling the current slew rate when the load current decreases;
the control method of the current slew rate when the load current is increased comprises the following steps: changing the voltage value of the auxiliary bidirectional buck-boost power supply in the first direction according to the required current slew rate, then disconnecting the first switch Q1, and switching on the second switch Q2 to enable the load simulation circuit to work in a follow current state; when the current value of the required load is close, the first switch Q1 is switched on, and the second switch Q2 is switched off, so that the load simulation circuit works in an energy conversion state and is restored to a stable working state;
the control method of the current slew rate when the load current is reduced comprises the following steps: changing the voltage value of the auxiliary bidirectional buck-boost type power supply in the first direction according to the required current slew rate, disconnecting the first switch Q1, and connecting the second switch Q2, wherein the load simulation circuit works in a follow current state, and the load current changes at the rate of the ratio of the voltage difference value of the voltage of the tested power supply and the auxiliary bidirectional buck-boost type power supply in the first direction to the input inductance value; when the required load current value is approached, the first switch Q1 is turned on, the second switch Q2 is turned off, and the load simulation circuit works in an energy conversion state and returns to a stable working state.
6. The method as claimed in any one of claims 4 to 5, wherein the voltage value in the first direction is controlled by changing a duty ratio of a single-phase full-bridge Buck-boost circuit module in the auxiliary bidirectional Buck-boost power supply.
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CN112526384A (en) * 2021-02-09 2021-03-19 武汉精能电子技术有限公司 Electronic load circuit

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