CN113054647B - Energy recovery device of DC/DC module - Google Patents
Energy recovery device of DC/DC module Download PDFInfo
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- CN113054647B CN113054647B CN202110488477.9A CN202110488477A CN113054647B CN 113054647 B CN113054647 B CN 113054647B CN 202110488477 A CN202110488477 A CN 202110488477A CN 113054647 B CN113054647 B CN 113054647B
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- 238000011084 recovery Methods 0.000 title claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 32
- 238000004804 winding Methods 0.000 claims description 30
- 238000001914 filtration Methods 0.000 claims description 8
- 230000001131 transforming effect Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000032683 aging Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002431 foraging effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
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- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- 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
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Abstract
The invention relates to the field of electronics, in particular to an energy recovery device of a DC/DC module, which comprises a conversion circuit connected with a load circuit and used for recovering and converting the power of the load circuit, wherein the output end of the conversion circuit is connected with the input end of the DC/DC module, the conversion circuit comprises a transformation circuit connected with the output end of the load circuit and a rectification filter circuit connected with the output end of the transformation circuit, and the output end of the rectification filter circuit is connected with the input end of the DC/DC module. The invention has the beneficial effects that: the conversion circuit transmits and converts the power of the load circuit through the voltage transformation circuit and the rectification filter circuit, and recovers the energy to the input end of the DC/DC module, thereby reducing the heat emission and saving the energy.
Description
Technical Field
The invention relates to the field of electronics, in particular to an energy recovery device of a DC/DC module.
Background
During the power aging test of the DC/DC power supply module, a load with rated output power is required to be applied to the DC/DC module within a specified time under specific environment and input voltage conditions. The conventional power aging test circuit is shown in fig. 1, wherein Vs is an input power supply, Vin is an input voltage, Vout is an output voltage (which can be output positively/negatively), and RL is a power load (which can be a pure resistive load or a programmable electronic load), so that the output power is converted into heat energy through the load RL and is discharged into the air, which causes waste.
Disclosure of Invention
In order to solve the above problems, the present invention provides an energy recovery device for a DC/DC module.
The energy recovery device of the DC/DC module comprises a conversion circuit which is connected with a load circuit and is used for recovering and converting the power of the load circuit, the output end of the conversion circuit is connected with the input end of the DC/DC module, the conversion circuit comprises a transformation circuit connected with the output end of the load circuit and a rectification filter circuit connected with the output end of the transformation circuit, and the output end of the rectification filter circuit is connected with the input end of the DC/DC module.
Preferably, the load circuit includes MOS transistors Q1, Q2, Q3 and Q4, the D pole of the MOS transistor Q1 is connected to the output terminal of the DC/DC module, the S pole of the MOS transistor Q1 is connected to the S pole of the MOS transistor Q2, the D pole of the MOS transistor Q2 is connected to the transformer circuit, the D pole of the MOS transistor Q4 is connected to the ground terminal of the DC/DC module, the S pole of the MOS transistor Q4 is connected to the S pole of the MOS transistor Q3, and the D pole of the MOS transistor Q3 is connected to the transformer circuit.
Preferably, the transformer circuit includes a transformer T3, resistors R13, R14, Rs1, a capacitor C6, and a capacitor C7, a first end of a first primary winding of the transformer T3 is connected to the output terminal of the DC/DC module and one end of a resistor R13, a second end of the first primary winding is connected to the load circuit and one end of a capacitor C6, and the other end of the resistor R13 is connected to the other end of the capacitor C6; a first end of a second primary coil of the transformer T3 is connected to the load circuit and one end of the resistor R14, a second end of the second primary coil is connected to the load circuit, one end of the capacitor C7 and one end of the resistor Rs1, the other end of the resistor R14 is connected to the other end of the capacitor C7, and the other end of the resistor Rs1 is connected to the ground terminal of the DC/DC module; the output end of the first secondary winding of the transformer T3 is connected with a rectifying and filtering circuit, and the output end of the second secondary winding of the transformer T3 is connected with the rectifying and filtering circuit.
Preferably, the rectification filter circuit comprises diode groups D1 and D2, capacitors C10 and C11, and switches K1 and K2; the positive electrode of the diode group D1 is connected with the output end of the transformation circuit, the negative electrode of the diode group D1 is connected with one end of the capacitor C10, the positive input end of the DC/DC module and the third end of the switch K2, the other end of the capacitor C10 is connected with the output end of the transformation circuit and the second end of the switch K1, the positive electrode of the diode group D2 is connected with the output end of the transformation circuit, the negative electrode of the diode group D2 is connected with one end of the capacitor C11 and the second end of the switch K2, the other end of the capacitor C11 is connected with the output end of the transformation circuit, the third end of the switch K1 and the negative input end of the DC/DC module, and the first end of the switch K1 is connected with the first end of the switch K2.
Preferably, the driver circuit is connected to a load circuit.
Preferably, the driving circuit includes transformers T1, T2, resistors R5, R6, R7, R8, R9, R10, R11 and R12, a first end of a primary coil of the transformer T1 is connected to one end of the resistor R5, a second end of the primary coil of the transformer T1 is connected to one end of the resistor R6, a first end of a primary coil of the transformer T2 is connected to one end of the resistor R7, and a second end of the primary coil of the transformer T2 is connected to one end of the resistor R8; a first end of a first secondary coil of the transformer T1 is connected with one end of a resistor R9, a second end of the first secondary coil of the transformer T1 is connected with a load circuit and a second end of the first secondary coil of the transformer T2, and the other end of the resistor R9 is connected with the load circuit; a first end of a second secondary winding of the transformer T1 is connected to one end of the resistor R11, a second end of the second secondary winding of the transformer T1 is connected to the load circuit and a second end of the second secondary winding of the transformer T2, and the other end of the resistor R11 is connected to the load circuit; a first end of a first secondary coil of the transformer T2 is connected with one end of a resistor R10, a second end of the first secondary coil of the transformer T2 is connected with a load circuit and a second end of the first secondary coil of the transformer T1, and the other end of the resistor R10 is connected with the load circuit; a first end of the second secondary winding of the transformer T2 is connected to one end of the resistor R12, a second end of the second secondary winding of the transformer T2 is connected to the load circuit and a second end of the second secondary winding of the transformer T1, and the other end of the resistor R12 is connected to the load circuit.
Preferably, the device further comprises a pulse generator connected with the driving circuit, and the pulse generator outputs a pair of PWM pulse signals.
Preferably, the device further comprises a controller connected with the pulse generator and used for controlling the pulse generator.
Preferably, the controller adopts STM32F103 series single-chip microcomputer to output control signals through SPI bus.
Preferably, the controller further comprises a digital-to-analog conversion chip connected between the controller and the pulse generator.
The invention has the beneficial effects that:
1. the conversion circuit transmits and converts the power of the load circuit through the voltage transformation circuit and the rectification filter circuit, and recovers the energy to the input end of the DC/DC module, thereby reducing the heat emission and saving the energy.
2. Because the input and output specifications of different DC/DC modules are different, the input voltage and feedback voltage range of the load circuit is larger, and the feedback efficiency is not high by fixing a group of transformers.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a burn-in test circuit according to the background of the invention;
FIG. 2 is a schematic structural diagram of an energy recovery device of a DC/DC module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an overall structure of an energy recovery device of a DC/DC module according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of an energy recovery device of a DC/DC module according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The invention has the basic idea that the power on the load circuit is transmitted and converted by the energy transmission circuit through the voltage transformation circuit and the rectification filter circuit through the conversion circuit, and the energy is recycled to the input end of the DC/DC module, thereby reducing the heat emission and saving the energy.
Based on the above idea, as shown in fig. 2, the present invention provides an energy recovery device for a DC/DC module, comprising a conversion circuit connected to a load circuit for recovering and converting power of the load circuit, wherein an output terminal of the conversion circuit is connected to an input terminal of the DC/DC module, and an input power source is further connected to an input terminal of the DC/DC module. The conversion circuit comprises a transformation circuit connected to the output end of the load circuit and a rectification filter circuit connected to the output end of the transformation circuit, and the output end of the rectification filter circuit is connected with the input end of the DC/DC module.
The DC/DC module has multi-path output and has the positive and negative output conditions, so the energy recycling system needs to meet the positive and negative polarity requirements at the same time, and meanwhile, in order to adapt to the aging requirements of the isolated DC/DC module, the input and the output of the energy recycling system also need to be isolated.
The direct current power output by the DC/DC module is converted into alternating current by driving a load circuit through a pulse with a certain frequency, the energy is converted through a voltage transformation circuit, and the alternating current power is converted into direct current through a rectification filter circuit and fed back to the input end of the DC/DC module to reduce the input power.
As shown in fig. 3, the energy recovery device of a DC/DC module of the present invention further includes a driving circuit connected to the load circuit, a pulse generator connected to the driving circuit, a controller for controlling the pulse generator, and a digital-to-analog conversion chip connected between the controller and the pulse generator.
The controller enables a DAC (digital-to-analog conversion chip) to output required voltage through an SPI bus, controls the pulse controller to output pulses, and drives the load circuit to conduct constant current.
Wherein, the controller adopts STM32F103 series singlechip to pass through SPI bus output control signal.
Specifically, as shown in fig. 4, the load circuit includes MOS transistors Q1, Q2, Q3, and Q4, the D pole of the MOS transistor Q1 is connected to the output terminal of the DC/DC module, the S pole of the MOS transistor Q1 is connected to the S pole of the MOS transistor Q2, the G pole of the MOS transistor Q1 is connected to the driving circuit, the D pole of the MOS transistor Q2 is connected to the transforming circuit, the G pole of the MOS transistor Q2 is connected to the driving circuit, the D pole of the MOS transistor Q4 is connected to the ground terminal of the DC/DC module, the S pole of the MOS transistor Q4 is connected to the S pole of the MOS transistor Q3, the G pole of the MOS transistor Q4 is connected to the driving circuit, the D pole of the MOS transistor Q3 is connected to the transforming circuit, and the G pole of the MOS transistor Q3 is connected to the driving circuit.
Specifically, the transformer circuit comprises a transformer T3, resistors R13, R14, Rs1, capacitors C6 and C7, a first end of a first primary coil of the transformer T3 is connected to the output end of the DC/DC module and one end of a resistor R13, a second end of the first primary coil is connected to the load circuit and one end of the capacitor C6, and the other end of the resistor R13 is connected to the other end of the capacitor C6; a first end of a second primary coil of the transformer T3 is connected to the load circuit and one end of the resistor R14, a second end of the second primary coil is connected to the load circuit, one end of the capacitor C7 and one end of the resistor Rs1, the other end of the resistor R14 is connected to the other end of the capacitor C7, and the other end of the resistor Rs1 is connected to the ground terminal of the DC/DC module; the output end of the first secondary winding of the transformer T3 is connected with a rectifying and filtering circuit, and the output end of the second secondary winding of the transformer T3 is connected with the rectifying and filtering circuit.
Specifically, the rectifying and filtering circuit comprises diode groups D1 and D2, capacitors C10 and C11, and switches K1 and K2; the positive electrode of the diode group D1 is connected with the output end of the transformation circuit, the negative electrode of the diode group D1 is connected with one end of the capacitor C10, the positive input end of the DC/DC module and the third end of the switch K2, the other end of the capacitor C10 is connected with the output end of the transformation circuit and the second end of the switch K1, the positive electrode of the diode group D2 is connected with the output end of the transformation circuit, the negative electrode of the diode group D2 is connected with one end of the capacitor C11 and the second end of the switch K2, the other end of the capacitor C11 is connected with the output end of the transformation circuit, the third end of the switch K1 and the negative input end of the DC/DC module, and the first end of the switch K1 is connected with the first end of the switch K2.
The transformer T3 has 2 groups of coils inside, and can be output in series and parallel through switches K1 and K2. When the parallel connection is carried out, the energy recovery efficiency is increased; when the DC-DC module is connected in series, the energy feedback output voltage can be increased, and the requirement of the input voltage of the DC-DC module is met.
Specifically, the driving circuit comprises transformers T1, T2, resistors R5, R6, R7, R8, R9, R10, R11 and R12, wherein a first end of a primary coil of the transformer T1 is connected with one end of a resistor R5, a second end of the primary coil of the transformer T1 is connected with one end of the resistor R6, a first end of a primary coil of the transformer T2 is connected with one end of the resistor R7, and a second end of the primary coil of the transformer T2 is connected with one end of a resistor R8; a first end of a first secondary coil of the transformer T1 is connected with one end of a resistor R9, a second end of the first secondary coil of the transformer T1 is connected with a load circuit and a second end of the first secondary coil of the transformer T2, and the other end of the resistor R9 is connected with the load circuit; a first end of a second secondary winding of the transformer T1 is connected to one end of the resistor R11, a second end of the second secondary winding of the transformer T1 is connected to the load circuit and a second end of the second secondary winding of the transformer T2, and the other end of the resistor R11 is connected to the load circuit; a first end of a first secondary coil of the transformer T2 is connected with one end of a resistor R10, a second end of the first secondary coil of the transformer T2 is connected with a load circuit and a second end of the first secondary coil of the transformer T1, and the other end of the resistor R10 is connected with the load circuit; a first end of the second secondary winding of the transformer T2 is connected to one end of the resistor R12, a second end of the second secondary winding of the transformer T2 is connected to the load circuit and a second end of the second secondary winding of the transformer T1, and the other end of the resistor R12 is connected to the load circuit.
The pulse generator is of a model SG3525, and the pulse generator also comprises resistors R1, R2, R3 and R4 and capacitors C1, C2, C3, C4 and C5 which are connected with the pulse generator in figure 4.
The digital-to-analog conversion chip and the controller circuit are prior art, and therefore are not described in detail.
In an exemplary embodiment, assuming that the aging power of the DC/DC module is Po (output power) 50W and the conversion efficiency η of the module itself is 80%, the conventional line without energy recovery is used for aging, and the input power source needs to provide power Pi 50W/80% 62.5W, which means that the module needs to consume 62.5W for aging. If the conversion circuit is adopted, the input power Pi is (Po/η) -Po is 12.5W, the energy required to be supplied is greatly saved, the loss is caused in the conversion circuit, and the maximum energy recovery efficiency in the case can reach more than 85%.
Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. An energy recovery device of a DC/DC module is applied to a burn-in test and is characterized by comprising a conversion circuit which is connected with a load circuit and is used for recovering and converting the power of the load circuit, the output end of the conversion circuit is connected with the input end of the DC/DC module, the conversion circuit comprises a transformation circuit connected with the output end of the load circuit and a rectification filter circuit connected with the output end of the transformation circuit, the output end of the rectification filter circuit is connected with the input end of the DC/DC module, wherein,
the load circuit comprises MOS tubes Q1, Q2, Q3, Q4 and Rs1, wherein the MOS tubes Q1, Q2, Q3 and Q4 respectively comprise anti-parallel diodes internally connected between an S pole and a D pole; the voltage transformation circuit comprises a transformer T3, wherein the D pole of the MOS tube Q1 is connected with the output end of the DC/DC module, the S pole of the MOS tube Q1 is connected with the S pole of the MOS tube Q2, the D pole of the MOS tube Q2 is connected with the first end of the second primary coil of the transformer T3, the second end of the second primary coil of the transformer T3 is connected with one end of a resistor Rs1, and the other end of the resistor Rs1 is connected with the grounding end of the DC/DC module; the D pole of MOS pipe Q4 is connected one end of resistance Rs1, and the S pole of MOS pipe Q4 is connected the S pole of MOS pipe Q3, and the D pole of MOS pipe Q3 is connected the second end of the first primary winding of transformer T3, the first end of the first primary winding of transformer T3 is connected the output of DC/DC module.
2. The energy recovery device of a DC/DC module according to claim 1, wherein the transforming circuit further comprises resistors R13, R14, capacitors C6, and C7, a first end of the first primary winding of the transformer T3 is connected to one end of the resistor R13, a second end of the first primary winding is connected to one end of the capacitor C6, and the other end of the resistor R13 is connected to the other end of the capacitor C6; a first end of a second primary coil of the transformer T3 is connected to one end of a resistor R14, a second end of the second primary coil is connected to one end of a capacitor C7 and one end of a resistor Rs1, and the other end of the resistor R14 is connected to the other end of a capacitor C7; the output end of the first secondary winding of the transformer T3 is connected with a rectifying and filtering circuit, and the output end of the second secondary winding of the transformer T3 is connected with the rectifying and filtering circuit.
3. The energy recovery device of a DC/DC module according to claim 1, wherein the rectifying and filtering circuit comprises diode groups D1, D2, capacitors C10, C11, and switches K1, K2; the positive electrode of the diode group D1 is connected with the output end of the transformation circuit, the negative electrode of the diode group D1 is connected with the positive electrode of the capacitor C10, the positive input end of the DC/DC module and the third end of the switch K2, the negative electrode of the capacitor C10 is connected with the output end of the transformation circuit and the second end of the switch K1, the positive electrode of the diode group D2 is connected with the output end of the transformation circuit, the negative electrode of the diode group D2 is connected with the positive electrode of the capacitor C11 and the second end of the switch K2, the negative electrode of the capacitor C11 is connected with the output end of the transformation circuit, the third end of the switch K1 and the negative input end of the DC/DC module, and the first end of the switch K1 is connected with the first end of the switch K2.
4. The energy recovery device of a DC/DC module according to claim 1, wherein the driving circuit is connected to a load circuit.
5. The energy recovery device of a DC/DC module according to claim 4, wherein the driving circuit comprises transformers T1, T2, resistors R5, R6, R7, R8, R9, R10, R11 and R12, a first end of a primary coil of the transformer T1 is connected with one end of a resistor R5, a second end of the primary coil of the transformer T1 is connected with one end of a resistor R6, a first end of the primary coil of the transformer T2 is connected with one end of a resistor R7, and a second end of the primary coil of the transformer T2 is connected with one end of a resistor R8; a first end of a first secondary coil of the transformer T1 is connected with one end of a resistor R9, a second end of the first secondary coil of the transformer T1 is connected with a load circuit and a second end of the first secondary coil of the transformer T2, and the other end of the resistor R9 is connected with the load circuit; a first end of a second secondary winding of the transformer T1 is connected to one end of the resistor R11, a second end of the second secondary winding of the transformer T1 is connected to the load circuit and a second end of the second secondary winding of the transformer T2, and the other end of the resistor R11 is connected to the load circuit; a first end of a first secondary coil of the transformer T2 is connected with one end of a resistor R10, a second end of the first secondary coil of the transformer T2 is connected with a load circuit and a second end of the first secondary coil of the transformer T1, and the other end of the resistor R10 is connected with the load circuit; a first end of the second secondary winding of the transformer T2 is connected to one end of the resistor R12, a second end of the second secondary winding of the transformer T2 is connected to the load circuit and a second end of the second secondary winding of the transformer T1, and the other end of the resistor R12 is connected to the load circuit.
6. The energy recovery device of claim 1, further comprising a pulse generator connected to the driving circuit, wherein the pulse generator outputs a pair of PWM pulse signals.
7. The energy recovery device of a DC/DC module according to claim 6, further comprising a controller connected to the pulse generator for controlling the pulse generator.
8. The energy recovery device of a DC/DC module according to claim 7, characterized in that the controller uses STM32F103 series single chip microcomputer to output control signals through SPI bus.
9. The energy recovery device of claim 7, further comprising a digital-to-analog conversion chip connected between the controller and the pulse generator.
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| CN202110488477.9A CN113054647B (en) | 2021-05-06 | 2021-05-06 | Energy recovery device of DC/DC module |
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