CN203708105U - Lossless absorption boost circuit and switching power supply - Google Patents
Lossless absorption boost circuit and switching power supply Download PDFInfo
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- CN203708105U CN203708105U CN201320830951.2U CN201320830951U CN203708105U CN 203708105 U CN203708105 U CN 203708105U CN 201320830951 U CN201320830951 U CN 201320830951U CN 203708105 U CN203708105 U CN 203708105U
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 79
- 239000003990 capacitor Substances 0.000 claims abstract description 68
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
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- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a lossless absorption boost circuit, and a switching power supply equipped with the lossless absorption boost circuit. The lossless absorption boost circuit comprises a voltage source, an electronic switch, a first inductor, a first diode, a first capacitor, an energy absorption module, and a power output end. According to the utility model, the energy of a reverse recovery current and the energy of leakage inductance are absorbed through the energy absorption module and then outputted, thereby enabling the energy of the reverse recovery current of the first diode and the energy of leakage inductance of the first inductor to be absorbed, wherein the energy can be outputted to a load for recycle, thereby achieving the lossless output of the circuit. Moreover, the current in the circuit cannot flow reversely when the energy absorption module is charged or discharged, thereby enabling the circuit not to generate oscillation, enabling the circuit not to be interfered, and enabling the boost effect not to be affected. In addition, the oscillation cannot cause the increasing of the loss of the circuit, thereby preventing elements in the circuit from being damaged.
Description
Technical Field
The utility model relates to a power technical field especially relates to a harmless absorption boost circuit and switching power supply.
Background
Fig. 1 is a schematic circuit structure diagram of a conventional boost topology circuit, where the boost topology circuit includes a voltage source U01, a tapped inductor L01, an inductor L02, a diode D01, a diode D02, a diode D03, a capacitor C01, a capacitor C02, and an electronic switch K01, the boost topology circuit shown in fig. 1 absorbs a reverse recovery current of the diode D01 through an inductor L02, a diode D02, a diode D03, and a capacitor C02, when the electronic switch K01 is turned on, the reverse recovery current of the diode D01 charges the capacitor C02 through the inductor L02 and the diode D02, and energy of the diode D01 in a reverse recovery current process is stored through a capacitor C02. However, when the voltage of the capacitor C02 exceeds the voltage peak of the capacitor C02, the capacitor C02 discharges through the diode D02, the inductor L02, the diode D01 and the capacitor C02, and at this time, the current flows to the ground through the diode D02, the inductor L02, the diode D01 and the capacitor C02, so that the current flows reversely during the charging process, which may cause the oscillation phenomenon of the circuit, and the oscillation of the circuit may cause interference, which affects the boosting effect of the circuit, and increases the circuit loss, or even may damage the circuit components when the oscillation is too large.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a harmless absorption boost circuit and switching power supply aims at realizing the lossless output of circuit, prevents moreover that the circuit from taking place the oscillation.
In order to achieve the above object, the present invention provides a lossless absorption boost circuit, which includes a voltage source, an electronic switch, a first diode, a first capacitor, a power output end, and a first inductor with a tap, wherein the lossless absorption boost circuit further includes an energy absorption module for absorbing energy of reverse recovery current and leakage inductance energy and outputting again, and current does not flow reversely in the charging and discharging process; wherein,
the first end of the first inductor is connected with the positive electrode of the voltage source, the second end of the first inductor is connected with the anode of the first diode through the energy absorption module, and the negative electrode of the voltage source is grounded; the cathode of the first diode is connected with the power output end and is grounded through the first capacitor; the first end of the electronic switch is connected with a tap of the first inductor, the second end of the electronic switch is grounded and connected with the energy absorption module, and the output end of the energy absorption module is connected with the anode of the first capacitor.
Preferably, the energy absorption module comprises a second inductor, a second capacitor, a second diode and a third diode;
one end of the second inductor is connected with the anode of the second diode, and the other end of the second inductor is connected with the second end of the first inductor;
one end of the second capacitor is connected with the anode of the first diode, and the other end of the second capacitor is connected with the cathode of the second diode and the anode of the third diode; the anode of the second diode is connected with the tap of the first inductor through the electronic switch, and the cathode of the third diode is connected with the anode of the first capacitor.
Preferably, the lossless absorption boost circuit further comprises a boost control chip for controlling the electronic switch to be turned on or off; and the PWM signal output end of the boost control chip is connected with the control end of the electronic switch.
Preferably, the lossless absorption boost circuit further comprises an output feedback module for sampling the voltage output by the power output terminal and feeding back the voltage to the boost control chip; the output feedback module comprises a first resistor and a second resistor, one end of the first resistor is connected with the power output end, and the other end of the first resistor is connected with the feedback input end of the boost control chip and grounded through the second resistor.
Preferably, the electronic switch includes an MOS transistor, a gate of the MOS transistor is connected to the PWM signal output terminal of the boost control chip, a drain of the MOS transistor is connected to a tap of the first inductor, and a source of the MOS transistor is grounded and connected to an anode of the second diode.
Preferably, the MOS transistor is an NMOS transistor.
Preferably, the electronic switch includes a triode, a base of the triode is connected with the PWM signal output terminal of the boost control chip, a collector of the triode is connected with a tap of the first inductor, and an emitter of the triode is grounded and connected with an anode of the second diode.
Preferably, the triode is an NPN triode.
Preferably, the energy absorption module further comprises a fourth diode, a fifth diode and a third capacitor;
the anode of the fourth diode is connected with the common connection point of the first inductor and the second inductor, the cathode of the fourth diode is connected with the anode of the fifth diode and is connected with the first end of the electronic switch through the third capacitor, and the cathode of the fifth diode is connected with the anode of the first capacitor.
The utility model also provides a switching power supply, this switching power supply includes the lossless absorption boost circuit, and this lossless absorption boost circuit includes voltage source, electronic switch, first diode, first electric capacity, power output end and is equipped with the first inductance of taking a percentage, the lossless absorption boost circuit still includes the energy that is used for absorbing reverse recovery current and leaks the inductance energy and export again, and the energy absorption module of charging and discharging process current non-counterflow; wherein,
the first end of the first inductor is connected with the positive electrode of the voltage source, the second end of the first inductor is connected with the anode of the first diode through the energy absorption module, and the negative electrode of the voltage source is grounded; the cathode of the first diode is connected with the power output end and is grounded through the first capacitor; the first end of the electronic switch is connected with a tap of the first inductor, the second end of the electronic switch is grounded and connected with the energy absorption module, and the output end of the energy absorption module is connected with the anode of the first capacitor.
The utility model provides a lossless absorption boost circuit, absorb reverse recovery current's energy and leakage inductance energy and export again through the energy absorption module, make the energy of the reverse recovery current of first diode and the leakage inductance energy of first inductance obtain absorbing, and can export to the load and reuse again, realize the lossless output of circuit, and energy absorption module charge-discharge in-process, the electric current can not flow against the current in the circuit, thereby the circuit can not produce the oscillation, make the circuit not disturbed, the effect of stepping up is not influenced, and can not lead to the circuit loss to increase because of the oscillation, and damage the components and parts in the circuit.
Drawings
FIG. 1 is a schematic circuit diagram of a conventional boost topology circuit;
fig. 2 is a schematic circuit structure diagram of a first embodiment of the lossless absorption boost circuit of the present invention;
fig. 3 is a schematic circuit structure diagram of a second embodiment of the lossless absorption boost circuit of the present invention;
fig. 4 is a schematic circuit structure diagram of a third embodiment of the lossless absorption boost circuit of the present invention;
fig. 5 is a schematic circuit diagram of a fourth embodiment of the lossless absorption boost circuit of the present invention.
The objects, features and advantages of the present invention will be realized by the embodiments and will be further described with reference to the accompanying drawings.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and the specific embodiments of the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a harmless absorption boost circuit.
Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of the first embodiment of the lossless absorption boost circuit of the present invention.
The utility model discloses a harmless absorption boost circuit includes voltage source U1, electronic switch K1, first inductance L1, first diode D1, first electric capacity C1, energy absorption module 10 and power output end Vout, is equipped with on this first inductance L1 to take a percentage, and this energy absorption module 10 is used for absorbing reverse recovery current's energy and leaking the inductance energy and exports again, and the charging and discharging process electric current is not adverse current.
A first end of the first inductor L1 is connected to the positive electrode of the voltage source U1, a second end of the first inductor L1 is connected to the anode of the first diode D1 through the energy absorption module 10, and the negative electrode of the voltage source U1 is grounded; the cathode of the first diode D1 is connected to the power output terminal Vout and to ground via the first capacitor C1; the first end of the electronic switch K1 is connected to the tap of the first inductor L1, the second end of the electronic switch K1 is grounded and connected to the energy absorption module 10, and the output end of the energy absorption module 10 is connected to the positive electrode of the first capacitor C1.
The utility model discloses lossless absorption booster circuit passes through energy absorption module 10 and absorbs reverse recovery current's energy and leakage inductance energy and exports again, make the energy of first diode D1's reverse recovery current and first inductance L1's leakage inductance energy obtain absorbing, and can export to the load through power output Vout and reuse again, realize the lossless output of circuit, and energy absorption module 10 charge-discharge in-process, the electric current can not flow against the current in the circuit, thereby the circuit can not produce the oscillation, make the circuit not disturbed, the boost effect is not influenced, and can not lead to the circuit loss to increase because the oscillation, and damage the components and parts in the circuit.
Specifically, as shown in fig. 2, the energy absorption module 10 includes a second inductor L2, a second capacitor C2, a second diode D2, and a third diode D3.
One end of the second inductor L2 is connected to the anode of the second diode D2, and the other end of the second inductor L2 is connected to the second end of the first inductor L1. One end of the second capacitor C2 is connected with the anode of the first diode D1, and the other end of the second capacitor C2 is connected with the cathode of the second diode D2 and the anode of the third diode D3; the anode of the second diode D2 is connected to the tap of the first inductor L1 via the electronic switch K1, and the cathode of the third diode D3 is connected to the anode of the first capacitor C1.
Specifically, the lossless absorption booster circuit further comprises a boost control chip 20, wherein the boost control chip 20 is used for controlling the electronic switch K1 to be switched on or switched off; the PWM signal output terminal of the boost control chip 20 is connected to the control terminal of the electronic switch K1. The boost control chip 20 outputs a PWM signal through its PWM signal output terminal to control the electronic switch K1 to turn on or off.
The lossless absorption boost circuit further comprises an output feedback module 30, the output feedback module 30 is configured to sample a voltage output by the power output terminal Vout and feed back the voltage to the boost control chip 20, the output feedback module 30 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the power output terminal Vout, and the other end of the first resistor R1 is connected to a feedback input terminal of the boost control chip 20 and is grounded via a second resistor R2. In the output feedback module 30, the first resistor R1 and the second resistor R2 divide the voltage output by the power output terminal Vout and feed the divided voltage back to the feedback input terminal of the boost control chip 20, so that the boost control chip 20 controls the on/off time of the electronic switch K1 according to the received voltage, and the output voltage of the lossless absorption boost circuit is stable.
The electronic switch K1 includes a MOS transistor, and the MOS transistor of this embodiment is preferably an NMOS transistor. The grid electrode of the MOS tube is the control end of the electronic switch K1, the drain electrode of the MOS tube is the first end of the electronic switch K1, and the source electrode of the MOS tube is the second end of the electronic switch K1. The gate of the MOS transistor is connected to the PWM signal output terminal of the boost control chip 20, the drain of the MOS transistor is connected to the tap of the first inductor L1, and the source of the MOS transistor is grounded and connected to the anode of the second diode D2. When the PWM signal output from the boost control chip 20 is at a high level, the electronic switch K1 is turned on, and when the PWM signal output from the boost control chip 20 is at a low level, the electronic switch K1 is turned off.
It should be understood by those skilled in the art that in a modified embodiment, the electronic switch K1 may also be a triode, and fig. 3 is a schematic circuit diagram of a second embodiment of the lossless absorption boost circuit according to the present invention. In contrast to fig. 2, the electronic switch K1 in fig. 3 comprises a transistor, preferably an NPN transistor. The base of the triode is the control end of the electronic switch K1, the collector of the triode is the first end of the electronic switch K1, and the emitter of the triode is the second end of the electronic switch K1. The base electrode of the triode is connected with the PWM signal output end of the boost control chip, the collector electrode of the triode is connected with a tap of the first inductor, and the emitter electrode of the triode is grounded and connected with the anode of the second diode. When the PWM signal output from the boost control chip 20 is at a high level, the electronic switch K1 is turned on, and when the PWM signal output from the boost control chip 20 is at a low level, the electronic switch K1 is turned off.
The operation principle of the lossless absorption boost circuit shown in fig. 2 and fig. 3 is the same, and the following description is made here:
during normal operation of the lossless absorption boost circuit shown in fig. 2 and 3, when the electronic switch K1 is turned on, because the first diode D1 has a reverse recovery process, the first diode D1 cannot be abruptly changed to a cut-off state, at this time, the first capacitor C1, the first diode D1, the second inductor L2, the first inductor L1 and the electronic switch K1 form a loop, the reverse recovery current of the first diode D1 flows through the second inductor L2, at this time, the second inductor L2 stores the energy of the reverse recovery current of the first diode D1, when the reverse recovery of the first diode D1 is completed, the electric energy stored in the second inductor L2 charges the second capacitor C2 through the first inductor L1, the electronic switch K1 and the second diode D2, the second capacitor C2 stores the electric energy output by the second inductor L2, and the electric energy output by the second inductor L2 is the superposition of the energy of the reverse recovery current of the first diode D1 and the leakage inductance energy of the second inductor L2.
When the electronic switch K1 is turned off, the anode of the second diode D2 is grounded, and since the voltage across the second capacitor C2 increases during the charging process of the second capacitor C2, the cathode voltage of the second diode D2 also increases, the second diode D2 is turned off, at this time, the second capacitor C2, the third diode D3, and the first capacitor C1 form a loop, the second capacitor C2 discharges through the third diode D3 and the first capacitor C1, and the electric energy generated at the first capacitor C1 is output to the load through the power output terminal Vout for reuse. Because the second diode D2 is cut off in the discharging process of the second capacitor C2, the current cannot flow to the second inductor L2 and the first diode D1, so that the circuit cannot oscillate, the circuit is not interfered, the boosting effect is not influenced, and the circuit loss cannot be increased due to oscillation to damage components in the circuit.
Referring to fig. 4 again, fig. 4 is a schematic circuit structure diagram of a third embodiment of the lossless absorption boost circuit of the present invention.
It will be understood by those skilled in the art that the lossless absorption boost circuit shown in fig. 2 can be applied in combination with the boost topology circuit shown in fig. 1, as shown in fig. 4, and in another modified embodiment, unlike fig. 2, the energy absorption module 10 in fig. 4 further includes a fourth diode D4, a fifth diode D5 and a third capacitor C3. The anode of the fourth diode D4 is connected to the common connection point of the first inductor L1 and the second inductor L2, the cathode of the fourth diode D4 is connected to the anode of the fifth diode D5 and to the first terminal of the electronic switch K1 via the third capacitor C3, and the cathode of the fifth diode D5 is connected to the anode of the first capacitor C1.
It should be understood by those skilled in the art that, in a further modified embodiment, the lossless absorption boost circuit shown in fig. 3 can be applied in combination with the boost topology circuit shown in fig. 1, and fig. 5 is a schematic circuit structure diagram of a fourth embodiment of the lossless absorption boost circuit of the present invention. Unlike fig. 3, the energy absorption module 10 in fig. 5 further includes a fourth diode D4, a fifth diode D5, and a third capacitor C3. The anode of the fourth diode D4 is connected to the common connection point of the first inductor L1 and the second inductor L2, the cathode of the fourth diode D4 is connected to the anode of the fifth diode D5 and to the first terminal of the electronic switch K1 via the third capacitor C3, and the cathode of the fifth diode D5 is connected to the anode of the first capacitor C1.
The operation principle of the lossless absorption boost circuit shown in fig. 4 and fig. 5 is the same, and the following description is made here:
in the normal operation process of the lossless absorption boost circuit shown in fig. 4 and 5, when the electronic switch K1 is turned on, the second inductor L2 stores the energy of the reverse recovery current of the first diode D1, and when the reverse recovery of the first diode D1 is completed, the second inductor L2 discharges through the fourth diode D4, the third capacitor C3, the electronic switch K1, the second diode D2 and the second capacitor C2, and at this time, the third capacitor C3 and the second capacitor C2 store the electric energy output by the second inductor L2, so that the situation that the voltage on the third capacitor C3 reaches the voltage peak value and discharges through the fourth diode D4, the second inductor L2, the first diode D1 and the first capacitor C1 can be avoided, and the circuit is prevented from oscillating.
When the electronic switch K1 is turned off, as shown in the operation principle of the lossless absorption boost circuit shown in fig. 2 and fig. 3, the second diode D2 is turned off, the second capacitor C2 discharges through the third diode D3 and the first capacitor C1, the third capacitor C3 discharges through the fifth diode D5 and the first capacitor C1, and the electric energy generated by the first capacitor C1 is output to the load through the power output terminal Vout for reuse. Since the second diode D2 is turned off during the discharging process of the second capacitor C2, the current does not flow to the second inductor L2 and the first diode D1, and thus the oscillation phenomenon does not occur in the circuit.
The utility model discloses still provide a switching power supply, this switching power supply includes the harmless boost circuit that absorbs, and the beneficial effect that this harmless structure, theory of operation and brought of absorbing boost circuit all refer to above-mentioned embodiment, and here is no longer repeated.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A lossless absorption booster circuit comprises a voltage source, an electronic switch, a first diode, a first capacitor, a power output end and a first inductor with a tap, and is characterized by further comprising an energy absorption module which is used for absorbing energy of reverse recovery current and leakage inductance energy and outputting again, and current does not flow reversely in the charging and discharging process; wherein,
the first end of the first inductor is connected with the positive electrode of the voltage source, the second end of the first inductor is connected with the anode of the first diode through the energy absorption module, and the negative electrode of the voltage source is grounded; the cathode of the first diode is connected with the power output end and is grounded through the first capacitor; the first end of the electronic switch is connected with a tap of the first inductor, the second end of the electronic switch is grounded and connected with the energy absorption module, and the output end of the energy absorption module is connected with the anode of the first capacitor.
2. A lossless absorption boost circuit as claimed in claim 1, wherein the energy absorption module includes a second inductor, a second capacitor, a second diode and a third diode;
one end of the second inductor is connected with the anode of the second diode, and the other end of the second inductor is connected with the second end of the first inductor;
one end of the second capacitor is connected with the anode of the first diode, and the other end of the second capacitor is connected with the cathode of the second diode and the anode of the third diode; the anode of the second diode is connected with the tap of the first inductor through the electronic switch, and the cathode of the third diode is connected with the anode of the first capacitor.
3. The lossless absorption boost circuit according to claim 2, wherein the lossless absorption boost circuit further includes a boost control chip for controlling the electronic switch to be turned on or off; and the PWM signal output end of the boost control chip is connected with the control end of the electronic switch.
4. The lossless absorption boost circuit according to claim 3, wherein the lossless absorption boost circuit includes an output feedback module for sampling the voltage output by the power supply output terminal and feeding back the voltage to the boost control chip; the output feedback module comprises a first resistor and a second resistor, one end of the first resistor is connected with the power output end, and the other end of the first resistor is connected with the feedback input end of the boost control chip and grounded through the second resistor.
5. The lossless absorption boost circuit as claimed in claim 4, wherein the electronic switch includes a MOS transistor, the gate of the MOS transistor is connected to the PWM signal output terminal of the boost control chip, the drain of the MOS transistor is connected to the tap of the first inductor, and the source of the MOS transistor is connected to ground and to the anode of the second diode.
6. The lossless absorption boost circuit as claimed in claim 5, wherein the MOS transistor is an NMOS transistor.
7. The lossless absorption boost circuit as claimed in claim 4, wherein the electronic switch comprises a transistor, a base of the transistor is connected to the PWM signal output terminal of the boost control chip, a collector of the transistor is connected to the tap of the first inductor, and an emitter of the transistor is connected to ground and to an anode of the second diode.
8. A lossless absorption boost circuit as claimed in claim 7, wherein said transistor is an NPN transistor.
9. A lossless absorption boost circuit as claimed in claim 6 or 8, wherein the energy absorption module further includes a fourth diode, a fifth diode and a third capacitor;
the anode of the fourth diode is connected with the common connection point of the first inductor and the second inductor, the cathode of the fourth diode is connected with the anode of the fifth diode and is connected with the first end of the electronic switch through the third capacitor, and the cathode of the fifth diode is connected with the anode of the first capacitor.
10. A switching power supply comprising the lossless absorption boost circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320830951.2U CN203708105U (en) | 2013-12-16 | 2013-12-16 | Lossless absorption boost circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320830951.2U CN203708105U (en) | 2013-12-16 | 2013-12-16 | Lossless absorption boost circuit and switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN203708105U true CN203708105U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320830951.2U Expired - Fee Related CN203708105U (en) | 2013-12-16 | 2013-12-16 | Lossless absorption boost circuit and switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018157458A1 (en) * | 2017-02-28 | 2018-09-07 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| CN112039426A (en) * | 2020-08-25 | 2020-12-04 | 中国空间技术研究院 | Low-loss solar cell shunting adjusting module |
-
2013
- 2013-12-16 CN CN201320830951.2U patent/CN203708105U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018157458A1 (en) * | 2017-02-28 | 2018-09-07 | 深圳市华星光电技术有限公司 | Voltage absorption circuit |
| CN112039426A (en) * | 2020-08-25 | 2020-12-04 | 中国空间技术研究院 | Low-loss solar cell shunting adjusting module |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20201216 |