CN106338699B - Dummy load circuit - Google Patents
Dummy load circuit Download PDFInfo
- Publication number
- CN106338699B CN106338699B CN201610902611.4A CN201610902611A CN106338699B CN 106338699 B CN106338699 B CN 106338699B CN 201610902611 A CN201610902611 A CN 201610902611A CN 106338699 B CN106338699 B CN 106338699B
- Authority
- CN
- China
- Prior art keywords
- resistor
- input end
- load circuit
- operational amplifier
- output
- 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
- G01R31/40—Testing power supplies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
- Electronic Switches (AREA)
Abstract
The invention relates to the field of power supply circuits, in particular to a dummy load circuit. When the pseudo-load circuit for the voltage module of the voltage analyzer provided by the invention outputs small voltage, the internal discharge current is controlled by the discharge reference, and when the output voltage is increased or the load is connected externally, the pseudo-load circuit is controlled by the voltage sampling and the current sampling together. When the load increases to a certain extent, the internal load stops operating. Therefore, the voltage-stabilizing output of the power supply in no-load can be realized, and the output power in full-load can not be influenced; effectively solved when the power is unloaded, if the PWM duty cycle drops to minimum, because the energy storage inductance can not work the discontinuity of PWM that the CCM mode leads to the output that causes vibrates unstablely, the problem of ripple grow.
Description
Technical Field
The invention relates to the field of power supply testing, in particular to a dummy load circuit.
Background
Typically, when conducting tests associated with dc power, engineers must pool and configure multiple instruments to perform dc power and measurement tasks. While performing these complex tasks, multiple test instruments may be received at the same time, increasing the risk of error; for this reason, engineers may choose automated testing that is far more complex than manual testing, but while automated testing tasks reduce human error, writing and debugging programs further increases the workload for development engineers who are already overloaded. The appearance of the direct-current power supply analyzer avoids the use of multiple devices by engineers and the complex debugging before the test. The power analyzer can measure the current flowing into the DUT by its built-in current dynamic measurement capability without the need for sensors such as current probes and shunts; the direct-current power supply analyzer does not need to develop a control program and a measurement program, all functions and measurement are integrated in the same equipment, and a PC (personal computer), a driving program and software are not needed, so that the workload related to setting is reduced by more than 90%; the direct current power supply and measurement test tasks which can be completed within 2 days by a user using the independent test equipment can be completed within 5 minutes by using the direct current power supply analyzer. Generally, a universal meter module, an oscilloscope module, an arbitrary waveform generation module, a data recording module and a plurality of dc power modules are integrated in the dc power analyzer, wherein a plurality of dc power modules with different output powers are undoubtedly one of the most core devices of the power analyzer, and when the dc power modules output a small voltage, because the PWM duty ratio is reduced to a minimum value, if the power output is no-load, because the energy storage inductor cannot work to a CCM mode, the discontinuity of PWM can be caused, which causes unstable output oscillation and large ripple.
Disclosure of Invention
The invention aims to solve the problems that output oscillation is unstable and ripples become large when small voltage of each power supply module in a direct-current power supply analyzer is output. A dummy load circuit capable of preventing a power supply module from performing an idling state is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a dummy load circuit, wherein the dummy load circuit comprises a first sub dummy load circuit and a second sub dummy load circuit connected in parallel; the first sub dummy load circuit and the second sub dummy load circuit are arranged at the output end of the power conversion module in the power supply module;
the first sub dummy load circuit comprises a first controllable switch, a second operational amplifier and a first resistor connected with the first controllable switch in series;
the source electrode of the first controllable switch is connected with the first resistor, and the source electrode of the first controllable switch is also connected with the inverted input end of the second operational amplifier through a fifth resistor;
the positive phase input end of the second operational amplifier is simultaneously connected with the discharge reference input end, the voltage sampling input end and the current sampling input end;
the output of the second operational amplifier is connected with the control end of the first controllable switch through a fourth resistor;
the output end of the second operational amplifier is also connected with the self inverting input end through a third resistor and a first capacitor in sequence; the third resistor and the first capacitor are also connected in parallel with the first diode; the anode of the first diode is connected with the first capacitor, and the cathode of the first diode is connected with the third resistor;
the second sub dummy load circuit comprises a second controllable switch, a third operational amplifier and a second resistor connected with the second controllable switch in series;
the source electrode of the second controllable switch is connected with the second resistor, and the source electrode of the second controllable switch is also connected with the inverted input end of the third operational amplifier through a ninth resistor;
the positive phase input end and the positive phase input end of the third operational amplifier are simultaneously connected with the discharge reference input end, the voltage sampling input end and the current sampling input end;
the output of the third operational amplifier is connected with the control end of the second controllable switch through a first resistor;
the output end of the third operational amplifier is also connected with the self inverting input end through a tenth resistor and a second capacitor in sequence; the tenth resistor and the second capacitor are also connected in parallel with the second diode; and the anode of the second diode is connected with the second capacitor, and the cathode of the second diode is connected with the tenth resistor.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
when the pseudo-load circuit for the voltage module of the voltage analyzer provided by the invention outputs small voltage, the internal discharge current is controlled by the discharge reference, and when the output voltage is increased or the external is connected to the load, the voltage sampling and the current sampling are jointly controlled. When the load increases to a certain extent, the internal load stops operating. Therefore, the voltage-stabilized output of the power supply in no-load can be realized, and the output power in full-load can not be influenced; effectively solved when the power is unloaded, if the PWM duty cycle drops to minimum value, because the energy storage inductance can not work the discontinuity of PWM that the CCM mode leads to the output shock that causes is unstable, the problem of ripple grow.
Drawings
Fig. 1 is a circuit diagram of a dummy load circuit provided by the present invention.
Fig. 2 is a diagram of an exemplary power conversion module applied to the dummy load circuit provided in the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1: as shown in fig. 1, the present embodiment provides a dummy load circuit including a first sub dummy load circuit and a second sub dummy load circuit connected in parallel; the first sub dummy load circuit and the second sub dummy load circuit are arranged between output terminals VOUT + and VOUT-of the power conversion module in the power supply module shown in fig. 2;
the first sub dummy load circuit comprises a first controllable switch Q1, a second operational amplifier U1 and a first resistor R1 connected with the first Q1 controllable switch in series; the source electrode of the first controllable switch Q1 is connected with the first resistor R1, and the source electrode of the first controllable switch Q1 is also connected with the inverting input end of the second operational amplifier U1 through a fifth resistor R5; the positive phase input end and the positive phase input end of the second operational amplifier U1 are simultaneously connected with the discharge reference input end, the voltage sampling input end and the current sampling input end; the output of the second operational amplifier U1 is connected with the control end of the first controllable switch Q1 through a fourth resistor R4; the output end of the second operational amplifier U1 is also connected with the self inverting input end through a third resistor R3 and a first capacitor C1 in sequence; the third resistor R3 and the first capacitor C1 are also connected in parallel with the first diode D1; the positive electrode of the first diode D1 is connected with the first capacitor C1, and the negative electrode of the first diode D1 is connected with the third resistor R3.
The second sub dummy load circuit comprises a second controllable switch U2, a third operational amplifier U2 and a second resistor R2 connected with the second controllable switch U2 in series; the source electrode of the second controllable switch U2 is connected to the second resistor R2, and the source electrode of the second controllable switch U2 is also connected to the inverting input terminal of the third operational amplifier U2 through a ninth circuit R9; the positive phase input end and the positive phase input end of the third operational amplifier U2 are simultaneously connected with the discharge reference input end, the voltage sampling input end and the current sampling input end; the output of the third operational amplifier U2 is connected with the control end of the second controllable switch U2 through a first circuit R11; the output end of the third operational amplifier U2 is also connected with the self inverting input end through a tenth resistor R10 and a second capacitor C2 in sequence; the tenth resistor R10 and the second capacitor C2 are also connected in parallel with a second diode D2; and the anode of the second diode D2 is connected with the second capacitor C2, and the cathode of the second diode D2 is connected with the tenth resistor R10. During operation, the dummy load circuit is controlled by discharge reference, voltage sampling and current sampling together, because the PWM duty cycle is reduced to a minimum value during small-voltage output, if the power output is no-load at the moment, the energy storage inductor can not work in a CCM mode, the discontinuity of PWM can be caused, the output oscillation is unstable, and the ripple wave is increased. By arranging the dummy load circuit in the power supply, the internal dummy load ensures the continuity of PWM control when the power supply outputs in a no-load state. The magnitude of the discharge current is controlled by the discharge reference, the voltage sampling and the current sampling together. During no-load, the internal discharge current is mainly controlled by the discharge reference, and when the output voltage is increased or the external is connected to the load, the voltage sampling and the current sampling are jointly controlled. When the load increases to a certain extent, the internal load stops operating. Therefore, the power supply can be output in a voltage-stabilizing manner in no-load, and the output power in full-load is not influenced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. A dummy load circuit, wherein the dummy load circuit comprises a first sub dummy load circuit and a second sub dummy load circuit connected in parallel; the first sub dummy load circuit and the second sub dummy load circuit are arranged at the output end of the power conversion module in the power supply module;
the first sub dummy load circuit comprises a first controllable switch, a second operational amplifier and a first resistor connected with the first controllable switch in series;
the source electrode of the first controllable switch is connected with the first resistor, and the source electrode of the first controllable switch is also connected with the inverted input end of the second operational amplifier through a fifth resistor;
the positive phase input end of the second operational amplifier is simultaneously connected with the discharge reference input end, the voltage sampling input end and the current sampling input end;
the output of the second operational amplifier is connected with the control end of the first controllable switch through a fourth resistor;
the output end of the second operational amplifier is also connected with the self inverting input end through a third resistor and a first capacitor in sequence; the third resistor and the first capacitor are also connected in parallel with the first diode; the anode of the first diode is connected with the first capacitor, and the cathode of the first diode is connected with the third resistor;
the second sub dummy load circuit comprises a second controllable switch, a third operational amplifier and a second resistor connected with the second controllable switch in series;
the source electrode of the second controllable switch is connected with the second resistor, and the source electrode of the second controllable switch is also connected with the inverted input end of the third operational amplifier through a ninth resistor;
the positive phase input end and the positive phase input end of the third operational amplifier are simultaneously connected with the discharge reference input end, the voltage sampling input end and the current sampling input end;
the output of the third operational amplifier is connected with the control end of the second controllable switch through a first resistor;
the output end of the third operational amplifier is also connected with the self inverting input end through a tenth resistor and a second capacitor in sequence; the tenth resistor and the second capacitor are also connected in parallel with the second diode; and the anode of the second diode is connected with the second capacitor, and the cathode of the second diode is connected with the tenth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610902611.4A CN106338699B (en) | 2016-10-18 | 2016-10-18 | Dummy load circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610902611.4A CN106338699B (en) | 2016-10-18 | 2016-10-18 | Dummy load circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106338699A CN106338699A (en) | 2017-01-18 |
| CN106338699B true CN106338699B (en) | 2023-04-18 |
Family
ID=57840004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610902611.4A Active CN106338699B (en) | 2016-10-18 | 2016-10-18 | Dummy load circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106338699B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061248A (en) * | 2018-06-13 | 2018-12-21 | 西安石油大学 | It is a kind of can Spline smoothing DC test power supply implementation method and circuit |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5323278A (en) * | 1992-09-17 | 1994-06-21 | International Business Machines Corporation | Low noise amplifier circuit for magnetoresistive sensors for fast read-write switching in low supply voltage applications |
| CN201662612U (en) * | 2010-02-03 | 2010-12-01 | 上海康耐司信号设备有限公司 | Dummy load system for automotive LED turn signal lamps |
| JP2012257064A (en) * | 2011-06-09 | 2012-12-27 | Nec Network & Sensor Systems Ltd | Dummy load device |
| CN103149386A (en) * | 2013-03-05 | 2013-06-12 | 深圳市中科源电子有限公司 | Electronic load module of power supply aging test and power supply aging test system |
| CN103376873A (en) * | 2012-04-20 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Minimum load current adapter circuit and mainboard |
| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
| CN204536419U (en) * | 2015-03-17 | 2015-08-05 | 李景华 | The digital reflective power table of PSM broadcast transmitter |
| CN205178884U (en) * | 2015-12-15 | 2016-04-20 | 深圳优博聚能科技有限公司 | False load circuit of output adjustable adjustable power |
| CN206114872U (en) * | 2016-10-18 | 2017-04-19 | 成都前锋电子仪器有限责任公司 | False load circuit |
-
2016
- 2016-10-18 CN CN201610902611.4A patent/CN106338699B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5323278A (en) * | 1992-09-17 | 1994-06-21 | International Business Machines Corporation | Low noise amplifier circuit for magnetoresistive sensors for fast read-write switching in low supply voltage applications |
| CN201662612U (en) * | 2010-02-03 | 2010-12-01 | 上海康耐司信号设备有限公司 | Dummy load system for automotive LED turn signal lamps |
| JP2012257064A (en) * | 2011-06-09 | 2012-12-27 | Nec Network & Sensor Systems Ltd | Dummy load device |
| CN103376873A (en) * | 2012-04-20 | 2013-10-30 | 鸿富锦精密工业（深圳）有限公司 | Minimum load current adapter circuit and mainboard |
| CN103149386A (en) * | 2013-03-05 | 2013-06-12 | 深圳市中科源电子有限公司 | Electronic load module of power supply aging test and power supply aging test system |
| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
| CN204536419U (en) * | 2015-03-17 | 2015-08-05 | 李景华 | The digital reflective power table of PSM broadcast transmitter |
| CN205178884U (en) * | 2015-12-15 | 2016-04-20 | 深圳优博聚能科技有限公司 | False load circuit of output adjustable adjustable power |
| CN206114872U (en) * | 2016-10-18 | 2017-04-19 | 成都前锋电子仪器有限责任公司 | False load circuit |
Non-Patent Citations (1)
| Title |
|---|
| 电子假负载的制作与侧试;张国金 等;《电子制作》(第11期);第16-17页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106338699A (en) | 2017-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101634689B (en) | System and method for testing power supply properties | |
| US11360139B2 (en) | Method for testing a power module | |
| US9176178B2 (en) | Battery simulation circuit | |
| CN103516203A (en) | DC-DC controller and operation method thereof | |
| US7969176B2 (en) | Voltage margin test device | |
| Ferrero et al. | Low-cost battery monitoring by converter-based electrochemical impedance spectroscopy | |
| CN215449506U (en) | Testing device for power supply chip | |
| CN106338699B (en) | Dummy load circuit | |
| CN106329912A (en) | Auxiliary power supply circuit | |
| CN106533142B (en) | Anti-backflow circuit | |
| CN210006325U (en) | power supply experiment platform device | |
| Janković et al. | Microcontroller power consumption measurement based on PSoC | |
| CN206060528U (en) | A kind of auxiliary power circuit | |
| CN204103765U (en) | A kind of battery simulator | |
| CN211351757U (en) | Low-power consumption standby circuit, mobile power supply and robot | |
| CN106300966B (en) | One kind being used for power analysis instrument power module | |
| Subasinghage et al. | Single-input, dual polarity, dual output DC-DC converter implementation based on the SCALDO technique | |
| Wang et al. | Built-in test of switched-mode power converters: Avoiding DUT damage using alternative safe measurements | |
| CN206114872U (en) | False load circuit | |
| CN208226298U (en) | A kind of power supply unit and constant-current source of semiconductor laser | |
| CN106841964B (en) | High-precision programmable voltage soft circuit | |
| CN106329966B (en) | A kind of parallel power conversion circuit | |
| CN206074674U (en) | A kind of voltage sample circuit | |
| CN206258759U (en) | Voltage stable output device | |
| CN110620504A (en) | Power management integrated circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |