CN108649797B - DC-DC power supply structure based on Boost positive and negative output - Google Patents
DC-DC power supply structure based on Boost positive and negative output Download PDFInfo
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- CN108649797B CN108649797B CN201810620099.3A CN201810620099A CN108649797B CN 108649797 B CN108649797 B CN 108649797B CN 201810620099 A CN201810620099 A CN 201810620099A CN 108649797 B CN108649797 B CN 108649797B
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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
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- 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
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Abstract
The invention belongs to the technical field of power supply, and relates to a DC-DC power supply structure based on Boost positive and negative output, which comprises a Boost conversion structure, wherein the Boost conversion structure comprises an input direct current power supply Vin, an inductor L1, a diode D1, a switching tube Q1 and an energy storage filter capacitor C2; a capacitor C1 and a diode D2 which are connected in series are inserted into a switching node between the inductor L1 and the diode D1, a diode D3, the inductor L2 and an energy storage filter capacitor C3 which are connected in series are connected into a series node between the capacitor C1 and the diode D2, and two output ends of negative voltage are led out from two ends of the energy storage filter capacitor C3; the cathode of the diode D3 is connected with the capacitor C1, the anode of the diode D2 is connected with the capacitor C1, and the capacitor C1, the inductor L2 and the energy storage filter capacitor C3 form an LC filter circuit. The invention does not need to additionally increase a switch tube or a switch control chip, has simple circuit structure, low cost and stronger current output capability, and has smaller current pulsation and almost symmetrical positive and negative voltages.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a DC-DC power supply structure based on Boost positive and negative output.
Background
In most electronic circuits, a single power supply is generally used for supplying power, and in order to better exert the accuracy of an amplifying circuit, a positive and negative boosting power supply system is generally needed, and the current solution generally adopts a circuit conversion structure such as Boost, buck-Boost, cuk, sepic and the like. Wherein Boost is a positive Boost conversion structure, sepic is a positive Boost-Buck structure, cuk, buck-Boost is a negative Boost structure, and the conversion structures at least use one or more switching tubes (or switching control chips), an inductor L, a diode D and a capacitor C. If the power supply is positive and negative, a switch tube (or a switch control chip) is needed to be used, or more than one inductor L is added to realize the conversion requirement, so that the volume and the cost of the conversion circuit are greatly increased.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a DC-DC power supply structure based on Boost positive and negative output, which does not need to additionally increase a switch tube or a switch control chip, has simple circuit structure, low cost and stronger current output capability, and has smaller current pulsation and almost symmetrical positive and negative voltages.
The invention is realized by adopting the following technical scheme: the DC-DC power supply structure based on Boost positive and negative output comprises a Boost conversion structure, wherein the Boost conversion structure comprises an input direct current power supply Vin, an inductor L1, a diode D1, a switching tube Q1 and an energy storage filter capacitor C2, the positive electrode of the direct current power supply Vin is connected with the collector electrode of the switching tube Q1 through the inductor L1, the negative electrode of the direct current power supply Vin is connected with the emitter electrode of the switching tube Q1, the diode D1 is connected in series between the collector electrode of the switching tube Q1 and a positive output end, and the energy storage filter capacitor C2 is connected in parallel at two ends of an output load RL 1; a capacitor C1 and a diode D2 which are connected in series are inserted into a switching node between the inductor L1 and the diode D1, a diode D3, the inductor L2 and an energy storage filter capacitor C3 which are connected in series are connected into a series node between the capacitor C1 and the diode D2, and two output ends of negative voltage are led out from two ends of the energy storage filter capacitor C3; the cathode of the diode D3 is connected with the capacitor C1, the anode of the diode D2 is connected with the capacitor C1, and the capacitor C1, the inductor L2 and the energy storage filter capacitor C3 form an LC filter circuit.
Preferably, a damping resistor R1 is connected in series in the LC filter circuit. The damping resistor R1 has the following values:
preferably, the value of the inductance L2 is smaller than the value of the inductance L1. The range of the inductance L2 is as follows:
where Vn is the voltage drop of the load on the negative voltage output, VC3 (MAX) -vc3=vn.
Compared with the prior art, the DC-DC power supply structure based on Boost positive and negative output has the following advantages and beneficial effects: the circuit structure is simple, and the boosting process of the negative power supply is completed by only adding a small inductor L2, a resistor R1, two diodes D2 and D3 and two capacitors C1 and C3 on the basis of the original Boost circuit; the current output capability is relatively strong, the current pulsation is relatively small, and the positive voltage and the negative voltage are almost symmetrical; most importantly, a switch tube (a switch control chip) is saved, and the added inductance L is relatively small, so that not only is the cost saved, but also a lot of precious space is saved.
Drawings
Fig. 1 is a diagram of a conversion circuit configuration of the present invention;
FIG. 2 is a graph of the time relationship of switching on (Ton) and off (Toff) of a switching tube;
FIG. 3 is a negative boost equivalent circuit diagram of the present invention during switching on of the switching tube;
fig. 4 is a negative boost equivalent circuit diagram of the present invention during switching off of the switching tube.
Detailed Description
The conversion circuit structure of the invention is shown in fig. 1, and a typical Boost conversion structure comprises an input direct current power supply Vin, an inductor L1, a diode D1, a switching tube Q1 and an energy storage filter capacitor C2, wherein the positive electrode of the direct current power supply Vin is connected with the collector electrode of the switching tube Q1 through the inductor L1, the negative electrode of the direct current power supply Vin is connected with the emitter electrode of the switching tube Q1, the base electrode of the switching tube Q1 inputs square wave signals, the diode D1 is connected between the collector electrode and the positive output end of the switching tube Q1 in series, and the energy storage filter capacitor C2 is connected at two ends of the output load RL1 in parallel. According to the invention, a capacitor C1 and a diode D2 which are connected in series are inserted into a switching node between an inductor L1 and a diode D1 of a typical Boost conversion structure, a diode D3, a resistor R1, an inductor L2 and an energy storage filter capacitor C3 (also called an output filter capacitor) which are connected in series are connected into a series node between the capacitor C1 and the diode D2, and two output ends of negative voltage are led out from two ends of the energy storage filter capacitor C3, so that a negative Boost structure is formed.
In summary, the negative boost structure of the circuit of the invention mainly transmits the energy of the capacitor C1 to the negative output to carry out negative boost when the switching tube is conducted in a steady state; structurally, the equal voltages of the capacitor C1 and the positive output filter capacitor C2 are derived from the energy conversion of the inductor L1 after the switching tube is turned off. The detailed working process of the invention is as follows:
fig. 2 illustrates the time relationship of the switching tube on (Ton) and off (Toff). During the on (Ton) period of the switching tube Q1 (see stage t0-t1 of fig. 2), the node potential between the diode D1 and the inductor L1 is equal to the negative potential of the input dc power supply, the positive potential (i.e., the anode potential) of the diode D1 is the negative electrode of the input dc power supply, the negative potential (i.e., the cathode potential) of the diode D1 is the output voltage +vo, and the diode D1 is reversely biased; the input voltage Vin is fully applied to the inductor L1, the current returns from the positive electrode of the input dc power Vin to the negative electrode of the input dc power through the inductor L1, and the current gradually increases. During the on period of the switching tube Q1, the potential of the positive electrode of the capacitor C1 is consistent with the negative electrode of the input direct current power supply: when the output voltage | -vo|=vc3=vc1-VD 3, where VD3 is the conduction voltage drop of the diode D3, the charge of the capacitor C1 does not pass through the current loop formed by the input dc power supply negative electrode, the output filter capacitor C3, the load RL2, the inductor L2, the resistor R1 and the diode D3, the current of the inductor L2 is 0, the negative voltage output is in an idle state, and the negative output voltage Vc3 (MAX) =vc2-0.6 reaches the maximum value. When the output voltage | -vo|=vc3, vc3 < Vc1-VD3, the charge of the capacitor C1 passes through the current loop formed by the input dc power negative electrode, the output filter capacitor C3, the load RL2, the inductor L2, the resistor R1 and the diode D3, as shown in fig. 3.
During the switching off (Toff) period (see stage t1-t2 of fig. 2), the current of the inductor L1 flows from the positive pole of the input dc power supply to the negative pole of the input dc power supply along the diode D1, the output filter capacitor C2 and the output load RL1, and the voltages at the two ends of the capacitor C1 and the capacitor C2 are equal to vc1=vc2. If the output voltage vo=vc3, vc3 < Vc1-VD3, the charge of the capacitor C1 passes through the current loop formed by the input dc power supply negative electrode, the output filter capacitor C3, the load RL2, the inductor L2, the resistor R1 and the diode D3 in the period t0-t1 (when the switching tube Q1 is turned on), the current of the inductor L2 passes through the damping resistor R1, the diode D3, the diode D2, the input dc power supply negative electrode, the output capacitor C3 and the load RL2 in the period t1-t2 (when the switching tube Q1 is turned off), as shown in fig. 4. If the output voltage i-Vo i=vc3=vc1-VD 3 during the period t0-t1 (when the switching tube Q1 is turned on), the charge of the capacitor C1 does not pass through the current loop formed by the input dc power supply negative electrode, the output capacitor C3, the load RL2, the inductor L2, the resistor R1 and the diode D3, and the current of the inductor L2 is 0, then the current of the inductor L2 during the period t1-t2 (when the switching tube Q1 is turned off) is also 0.
Diode D3 plays a role in the invention: during the closing period of the switch tube Q1, the current of the inductor L1 flows back to the negative electrode of the input direct current power supply along the capacitor C1 and the diode D2, the voltages at two ends of the capacitor C1 and the capacitor C2 are equal to each other, VC1=VC2, and the potential of the positive electrode (namely the anode) of the diode D2 is 0.6V higher than that of the negative electrode of the input power supply; and when the switch tube Q1 is conducted, if the current of the inductor L2 is 0, the negative electrode (namely the cathode) of the diode D3 is connected with the positive electrode of the diode D2, the potential is 0.6V, the potential of the positive electrode (namely the anode) of the diode D3 is-Vo, the diode D3 is reversely biased, the current generated from the 0.6V positive electrode potential of the diode D2 to the-Vo with lower potential is prevented by the diode D3, and the diode D3 plays a role in rectification.
The resistor R1 plays a role in the invention: since the negative voltage output structure is not provided with closed loop control, the damping resistor R1 is connected to prevent oscillation of the LC filter circuit structure composed of the capacitor C1, the inductor L2 and the capacitor C3. The calculation formula of R1 is as follows:
the inductance and volume of inductance L2 are estimated as follows: during the on period of the switching tube Q1, if the output voltage |vo|=vc3, vc3 < Vc1-VD3, the charge of the capacitor C1 is passed through a current loop formed by the input dc power supply negative electrode, the output filter capacitor C3, the load RL2, the inductor L2, the resistor R1 and the diode D3. After the load is connected, the voltage of the negative output is lower than that of the load when the load is not in load, which is also a necessary condition for energy transmission. Assuming that the negative voltage output terminal is connected with a load, the voltage drops to Vn, namely: VC3 (MAX) -vc3=vn; the range of the inductance L2 is as follows:
since the inductance L2 is much smaller than the inductance L1, the volume of the inductance L2 is smaller under the same current condition, and the space is saved.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (5)
1. The DC-DC power supply structure based on Boost positive and negative output comprises a Boost conversion structure, wherein the Boost conversion structure comprises an input direct current power supply Vin, an inductor L1, a diode D1, a switching tube Q1 and an energy storage filter capacitor C2, the positive electrode of the direct current power supply Vin is connected with the collector of the switching tube Q1 through the inductor L1, the negative electrode of the direct current power supply Vin is connected with the emitter of the switching tube Q1, the diode D1 is connected between the collector of the switching tube Q1 and a positive output end in series, the energy storage filter capacitor C2 is connected in parallel with two ends of an output load RL1, and the DC-DC power supply structure is characterized in that a capacitor C1 and a diode D2 which are connected in series are inserted at a switching node between the inductor L1 and the diode D1, and two output ends of the energy storage filter capacitor C3, wherein the diode D3 and the energy storage filter capacitor C3 are connected in series are connected at a series node; the cathode of the diode D3 is connected with the capacitor C1, the anode of the diode D2 is connected with the capacitor C1, and the capacitor C1, the inductor L2 and the energy storage filter capacitor C3 form an LC filter circuit;
the anode of the diode D1 is connected with the inductor L1, and the cathode is connected with the output load RL 1; the anode of the diode D3 is connected with the inductor L2, and the cathode of the diode D2 is connected with the emitter of the switching tube Q1;
the energy storage filter capacitor C3 is connected in parallel with two ends of the output load RL 2; the output load RL1 is a load of positive output, and the output load RL2 is a load of negative output.
2. The Boost positive and negative output-based DC-DC power supply structure according to claim 1, wherein a damping resistor R1 is connected in series in the LC filter circuit.
3. The DC-DC power supply structure based on Boost positive and negative output according to claim 2, wherein the damping resistor R1 has a value satisfying:
4. the Boost positive and negative output-based DC-DC power supply structure according to claim 1, wherein the value of the inductance L2 is smaller than the value of the inductance L1.
5. The DC-DC power supply structure based on Boost positive and negative output according to claim 4, wherein the range of values of the inductance L2 is as follows:
where Vn is the voltage drop of the load on the negative voltage output, VC3 (MAX) -vc3=vn.
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| CN108649797B true CN108649797B (en) | 2023-05-26 |
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| CN112054679B (en) * | 2020-09-11 | 2021-09-17 | 山东鲁软数字科技有限公司智慧能源分公司 | Positive and negative voltage conversion direct-current power supply and control method thereof |
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