CN201438672U - DC-DC direct current power circuit - Google Patents
DC-DC direct current power circuit Download PDFInfo
- Publication number
- CN201438672U CN201438672U CN2009201618025U CN200920161802U CN201438672U CN 201438672 U CN201438672 U CN 201438672U CN 2009201618025 U CN2009201618025 U CN 2009201618025U CN 200920161802 U CN200920161802 U CN 200920161802U CN 201438672 U CN201438672 U CN 201438672U
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- operational amplifier
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Abstract
The utility model relates to a DC-DC direct current power circuit which comprises an input filter circuit, a power converting circuit, a PWM control circuit, a voltage stabilizing feedback circuit, an output filter circuit, a protection circuit and a buck-boost switching circuit. A first MOSFET Q2 is in bridge connection between the input place of the power converting circuit and the output place of the output filter circuit; a second MOSFET Q2 is in bridge connection between the output place of the output filter circuit and the positive pole of the output terminal of the power converting circuit; and the grid electrodes of the two MOSFETs are electrically connected on the buck-boost switching circuit respectively. The utility model effectively increases the power of a power supply, solves the problem of great heat productivity of the power supply, and realizes the protections of overvoltage, overcurrent, short circuit and the like more easily.
Description
Technical field
The utility model relates to a kind of DC power supply circuit, the non-isolation buck DC power supply circuit of a kind of DC TO DC that says so more specifically.
Background technology
In needing the electronic application of stabilized supply voltage, the DC-DC DC power supply is by widely as present existing circuit; At present, this type of circuit is divided into two kinds usually: one is connected the main coil of transformer and the series circuit of switch between an end of DC power supply and the other end, transformer secondary output coil place connects rectifier smoothing circuit and the regression equation DC-DC DC transfer circuit of local resonance with capacitor that be connected in parallel at the switch place, transformer energy storage during switch connection, transformer released energy to load-side when switch disconnected, when local resonance has electric charge with capacitor is residual when switch connection, because this electric charge discharges through switch, can produce power consumption, so this circuit efficiency is not high and used transformer and volume is bigger; Another kind of DC-DC DC power supply circuit is by the conducting of PWM pulse width modulation mode control switch pipe with by realizing purpose to control big inductive energy storage and to discharge electric energy; rely on the mode of an inductive energy storage and release electric energy fully; in the time of in whole input voltage range and the output voltage range; take into account less than the efficient of being had a few all for the highest; thereby make power-efficient low; the inductance caloric value is big; influence life of product; the mode that relies on simultaneously a switch controlled inductive energy storage fully and release energy, then overvoltage; overcurrent; protective circuits such as excess temperature implement more complicated.
Summary of the invention
For overcoming above-mentioned deficiency, the utility model provides a kind of simple DC-DC DC power supply circuit.
To achieve these goals, the technical solution adopted in the utility model is: a kind of DC-DC DC power supply circuit, it comprises input filter circuit, circuit for power conversion, pwm control circuit, the voltage stabilizing feedback circuit, output filter circuit, input filter circuit connects the input of DC-DC DC power supply circuit, circuit for power conversion connects input filter circuit and output filter circuit, the voltage stabilizing feedback circuit connects the output of pwm control circuit and output filter circuit, pwm control circuit is connected with circuit for power conversion, it is characterized in that also connecting on the circuit for power conversion commutation circuit of a buck, cross-over connection the one MOSFET Q2 between the input ground of circuit for power conversion and the output ground of output filter circuit, cross-over connection the 2nd MOSFET Q3 between the input anode of the output of output filter circuit ground and circuit for power conversion, more than the grid of two MOSFET be electrically connected on respectively on the commutation circuit of buck.
The commutation circuit of buck comprises operational amplifier U3, diode: D18, D19-1, D19-2, D19-3, D21, D23, D24, resistance: RS50, RS51, RS52, RS53, RS54, RS55-1, RS55-2, RS55-3, MOSFET:Q5, Q6, capacitor C 13.
When operational amplifier U3 detected input voltage less than output voltage, MOSFET Q5 will conducting, and MOSFET Q6 ends immediately, thereby MOSFETQ2 conducting, MOSFET Q3 are ended, and the ground of output and the ground of input are connected, and realized boost function; When operational amplifier U3 detects input voltage greater than output voltage, will MOSFET Q6 conducting, MOSFET Q5 ends, thus MOSFET Q3 conducting, MOSFET Q2 are ended, make the ground of output and the just connection of input, realize buck functionality; Therefore, the utility model is to decide according to the relation between input and the output voltage to boost or step-down, fully equivalent BOOST circuit of the utility model circuit when boosting, give the output power supply after being equivalent to inductance and input string and getting up again, at this moment utilized a part of input, thereby the inductance burden is alleviated, and one one of output current is provided by input simultaneously, thereby power-efficient is got a promotion;
Regulate output owing to utilize input and inductance to act on simultaneously, the energy that consumes on inductance so reduces, and the problem that the power supply caloric value is big also is improved.
Because the utility model has added commutation circuit and a MOSFET Q2 coefficient with it, the 2nd MOSFET Q3 of buck; when the utility model adds protective circuit so; feedback signal not only makes chip U1 remove to close MOSFET Q1 by feedback and finishes the purpose that stops power work, can the one MOSFET Q2, the 2nd MOSFET Q3 be closed by feedback signal effect chip U1 simultaneously and reach the purpose that stops power work fast
Therefore, the utility model not only can improve the efficient of whole input voltage range and output voltage range, and the problem that the power supply caloric value is big also improves, and protections such as overvoltage simultaneously, overcurrent, short circuit are more prone to realize.
Description of drawings
Fig. 1 is the commutation circuit figure of buck of the present utility model;
Fig. 2 is output filter circuit figure of the present utility model;
Fig. 3 is protection of the present utility model and voltage stabilizing feedback circuit figure;
Fig. 4 is input filtering of the present utility model, power transfer, pwm control circuit figure;
Fig. 5 is a structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and the specific embodiments the utility model will be further described explanation.
As shown in Figure 5; the utility model discloses a kind of DC-DC DC power supply circuit; comprise input filter circuit; circuit for power conversion; the commutation circuit of buck; pwm control circuit; output filter circuit; the voltage stabilizing feedback circuit; protective circuit; input filter circuit connects the input of DC-DC DC power supply circuit; circuit for power conversion connects input filter circuit and output filter circuit; the commutation circuit of buck is connected with circuit for power conversion; pwm control circuit is connected with circuit for power conversion; the voltage stabilizing feedback circuit connects the output of pwm control circuit and output filter circuit, and protective circuit is connected between voltage stabilizing feedback circuit and the pwm control circuit.
As shown in Figure 4, diode D1, electric capacity: C1, C2, C3, C4 and inductance L 1 constitute input filter circuit; Inductance: L3, L2, MOSFET:Q1, Q2, Q3, Q7, Q8, diode: D14, D15 and chip: U1, U6 and peripheral circuit thereof are formed power transfer and pwm control circuit.
As shown in Figure 1, the commutation circuit of buck comprises operational amplifier U3, diode: D18, D19-1, D19-2, D19-3, D21, D23, D24, resistance: RS50, RS51, RS52, RS53, RS54, RS55-1, RS55-2, RS55-3, MOSFET:Q5, Q6, capacitor C 13; The positive pole of diode D23 is electrically connected with the grid of MOSFET Q3, the negative pole of diode D23 is electrically connected with the drain electrode of MOSFET Q5, the positive pole of diode D24 is electrically connected with the grid of MOSFET Q2, the negative pole of diode D24 is electrically connected with the drain electrode of MOSFET Q6, the source electrode of MOSFET Q5 and MOSFET Q6 is ground connection all, operational amplifier U3 the 4th pin ground connection, operational amplifier U3 the 8th pin is connected with the negative electricity of diode D18, the positive pole of diode D18 is connected with the output voltage terminal positive electrical, the 2nd of operational amplifier U3,5 pin are connected with the output voltage terminal positive electrical, the 3rd of operational amplifier U3,6 pin are electrically connected on the negative pole of the end of resistance R S55-1 and diode D19-2, the other end of resistance R S55-1 is connected with diode D19-1 negative electricity, the positive pole of diode D19-1 is connected in series on the inductance L 2A node, the positive electrical of diode D19-2 is connected on the inductance L 2C node, resistance R S55-2 and capacitor C 13 are connected in parallel between the 3rd pin and ground of operational amplifier U3, the negative pole of diode D19-3 is electrically connected with the 1st pin of operational amplifier U3, the positive pole of diode D19-3 is electrically connected with the grid of MOSFET Q5, the negative electricity of diode D21 is connected on operational amplifier U3 the 1st pin, the positive electrical of diode D21 is connected on the grid of MOSFET Q6, resistance R S50 two ends are electrically connected on respectively on the grid of the 8th pin of operational amplifier U3 and MOSFET Q5, resistance R S51 two ends are electrically connected on respectively in the drain electrode of operational amplifier U3 the 8th pin and MOSFET Q5, resistance R S52 two ends are electrically connected on respectively on the grid of the 8th pin of operational amplifier U3 and MOSFET Q6, resistance R S53 two ends are electrically connected on respectively in the drain electrode of the 8th pin of operational amplifier U3 and MOSFET Q6, and the grid that resistance R S55-3 two ends are electrically connected on MOSFET Q6 respectively and output are on the ground.
As shown in Figure 1, be connected a diode D20 between MOSFET Q5 and the MOSFET Q6, the positive pole of diode D20 is electrically connected with the grid of MOSFET Q5, and the negative pole of diode D20 is electrically connected with the drain electrode of MOSFET Q6.
As shown in Figure 1, be connected a diode D22 between MOSFET Q5 and the MOSFET Q6, the positive pole of diode D22 is electrically connected with the grid of MOSFET Q6, and the negative pole of diode D22 is electrically connected with the drain electrode of MOSFET Q5.
As shown in Figure 1, the 2nd, 5 pin of operational amplifier U3 are electrically connected, and the 3rd, 6 pin of operational amplifier U3 are electrically connected.
As shown in Figure 2, electric capacity: C7, C8, C9, C10, CS7, resistance R 1 and inductance L 4 constitute output filter circuit.
As shown in Figure 3, chip U2, U4 and U5 and peripheral circuit thereof are formed voltage stabilizing and various protective circuit, realize overcurrent, overvoltage, excess temperature, short-circuit protection function.
After the utility model energized, input filter circuit smoothly filters the noise of input signal, the chip U1 work of will switching on simultaneously, chip U1 exports high level, MOSFET Q1 conducting, inductance L 2 energy storage, at this moment inductive current is linear rises, when inductive current rises to the cut-off level of chip U1, chip U1 output low level, MOSFET Q1 turn-offs, the phase place of inductance L 2 is anti-phase, at this moment output rectifier conducting, inductance L 2 exoergic powering loads charge to output capacitance simultaneously, when chip U1 output high level, MOSFET Q1 conducting once more, so circulation is to reach the purpose of stable output;
When output voltage had downward trend, chip U4 amplified the back with error and feeds back to chip U1 by chip U5, and its duty ratio is increased, and inductive energy storage increases, and reaches the purpose of voltage stabilizing;
When output voltage was on the rise, chip U4 amplified the back with error and feeds back to chip U1 by chip U5, and its duty ratio is reduced, and inductive energy storage reduces, and reaches the purpose of voltage stabilizing;
When operational amplifier U3 detects input voltage less than output voltage, will allow MOSFET Q5 conducting, MOSFET Q6 end, thereby MOSFETQ2 conducting, MOSFET Q3 are ended, the ground of output and the ground of input are connected, realize boost function; When operational amplifier U3 detects input voltage greater than output voltage, will allow MOSFET Q6 conducting, MOSFET Q5 end, thereby MOSFETQ3 conducting, MOSFET Q2 are ended, make the ground of output and the just connection of input, realize buck functionality.
Because the 2nd, 5 pin of operational amplifier U3 are electrically connected in the commutation circuit of buck, the 3rd, 6 pin of operational amplifier U3 are electrically connected, the pin 1 of operational amplifier U3 is opposite with the output signal of pin 7, then make MOSFET Q5, MOSFET Q6 conducting simultaneously, the situation of conducting simultaneously can not appear in MOSFET Q2 and MOSFET Q3 yet so, avoids unusual generation.
When overvoltage, overcurrent, excess temperature, overload occurring; chip U2 will export triggering signal by the locked MOSFET Q7 of chip U6, MOSFET Q8 and peripheral circuit; thereby chip U1 is quit work, and MOSFET Q2 and MOSFET Q3 drawn extremely and closed, to reach the purpose of protection.
Above-described only is the utility model DC-DC DC power supply circuit preferred implementation; should be understood that; for the person of ordinary skill of the art; under the prerequisite that does not break away from the utility model creation design; can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (7)
1. DC-DC DC power supply circuit, it comprises input filter circuit, circuit for power conversion, pwm control circuit, the voltage stabilizing feedback circuit, output filter circuit, input filter circuit connects the input of DC-DC DC power supply circuit, circuit for power conversion connects input filter circuit and output filter circuit, the voltage stabilizing feedback circuit connects the output of pwm control circuit and output filter circuit, pwm control circuit is connected with circuit for power conversion, it is characterized in that also connecting on the circuit for power conversion commutation circuit of a buck, cross-over connection one a MOSFET Q2 between the input ground of circuit for power conversion and the output ground of output filter circuit, cross-over connection 1 the 2nd MOSFET Q3 between the output ground of output filter circuit and the input anode of circuit for power conversion, the grid of described first and second MOSFET is electrically connected on respectively on the commutation circuit of buck.
2. DC-DC DC power supply circuit according to claim 1, the commutation circuit that it is characterized in that described buck comprises operational amplifier U3, diode: D18, D19-1, D19-2, D19-3, D21, D23, D24, resistance: RS50, RS51, RS52, RS53, RS54, RS55-1, RS55-2, RS55-3, MOSFET:Q5, Q6, capacitor C 13; Wherein, the positive pole of diode D23 is electrically connected with the grid of MOSFET Q3, the negative pole of diode D23 is electrically connected with the drain electrode of MOSFET Q5, the positive pole of diode D24 is electrically connected with the grid of MOSFET Q2, the negative pole of diode D24 is electrically connected with the drain electrode of MOSFET Q6, the source electrode of MOSFET Q5 and MOSFET Q6 is ground connection all, operational amplifier U3 the 4th pin ground connection, operational amplifier U3 the 8th pin is connected with the negative electricity of diode D18, the positive pole of diode D18 is connected with the output voltage terminal positive electrical, the 2nd of operational amplifier U3,5 pin are connected with the output voltage terminal positive electrical, the 3rd of operational amplifier U3,6 pin are electrically connected on the negative pole of the end of resistance R S55-1 and diode D19-2, the other end of resistance R S55-1 is connected with diode D19-1 negative electricity, the positive pole of diode D19-1 is connected in series on the inductance L 2A node, the positive electrical of diode D19-2 is connected on the inductance L 2C node, resistance R S55-2 and capacitor C 13 are connected in parallel between the 3rd pin and ground of operational amplifier U3, the negative pole of diode D19-3 is electrically connected with the 1st pin of operational amplifier U3, the positive pole of diode D19-3 is electrically connected with the grid of MOSFET Q5, the negative electricity of diode D21 is connected on operational amplifier U3 the 1st pin, the positive electrical of diode D21 is connected on the grid of MOSFET Q6, resistance R S50 two ends are electrically connected on respectively on the grid of the 8th pin of operational amplifier U3 and MOSFET Q5, resistance R S51 two ends are electrically connected on respectively in the drain electrode of operational amplifier U3 the 8th pin and MOSFET Q5, resistance R S52 two ends are electrically connected on respectively on the grid of the 8th pin of operational amplifier U3 and MOSFET Q6, resistance R S53 two ends are electrically connected on respectively in the drain electrode of the 8th pin of operational amplifier U3 and MOSFET Q6, and the grid that resistance R S55-3 two ends are electrically connected on MOSFET Q6 respectively and output are on the ground.
3. DC-DC DC power supply circuit according to claim 1 is characterized in that being connected protective circuit between described voltage stabilizing feedback circuit and the pwm control circuit.
4. DC-DC DC power supply circuit according to claim 2, it is characterized in that being connected a diode D20 between described MOSFET Q5 and the MOSFET Q6, the positive pole of diode D20 is electrically connected with the grid of MOSFET Q5, and the negative pole of diode D20 is electrically connected with the drain electrode of MOSFET Q6.
5. DC-DC DC power supply circuit according to claim 2, it is characterized in that being connected a diode D22 between described MOSFET Q5 and the MOSFET Q6, the positive pole of diode D22 is electrically connected with the grid of MOSFET Q6, and the negative pole of diode D22 is electrically connected with the drain electrode of MOSFET Q5.
6. DC-DC DC power supply circuit according to claim 2 is characterized in that the 2nd, 5 pin of described operational amplifier U3 are electrically connected, and the 3rd, 6 pin of U3 are electrically connected.
7. DC-DC DC power supply circuit according to claim 3 is characterized in that described protective circuit comprises chip U2, and U4 and chip U5 and peripheral circuit thereof are formed various protective circuits, realizes overcurrent, overvoltage, excess temperature, short-circuit protection function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201618025U CN201438672U (en) | 2009-06-24 | 2009-06-24 | DC-DC direct current power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201618025U CN201438672U (en) | 2009-06-24 | 2009-06-24 | DC-DC direct current power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201438672U true CN201438672U (en) | 2010-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201618025U Expired - Lifetime CN201438672U (en) | 2009-06-24 | 2009-06-24 | DC-DC direct current power circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN201438672U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810163A (en) * | 2016-05-04 | 2016-07-27 | 深圳市华星光电技术有限公司 | Boost direct current-direct current converter |
| CN108321907A (en) * | 2018-04-03 | 2018-07-24 | 苏州瑞驱电动科技有限公司 | Slow charging circuit, converter circuit and its buffering method for electrically of BUCK circuits |
| WO2021050004A1 (en) * | 2019-09-09 | 2021-03-18 | Zero2.5 Biotech Pte. Ltd. | Apparatus for producing negative air ions |
-
2009
- 2009-06-24 CN CN2009201618025U patent/CN201438672U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810163A (en) * | 2016-05-04 | 2016-07-27 | 深圳市华星光电技术有限公司 | Boost direct current-direct current converter |
| CN105810163B (en) * | 2016-05-04 | 2018-08-14 | 深圳市华星光电技术有限公司 | Boost DC-direct current transducer |
| US10298008B2 (en) | 2016-05-04 | 2019-05-21 | Shenzhen China Star Optoelectronics Technology Co., Ltd | DC to DC boost converter |
| CN108321907A (en) * | 2018-04-03 | 2018-07-24 | 苏州瑞驱电动科技有限公司 | Slow charging circuit, converter circuit and its buffering method for electrically of BUCK circuits |
| WO2021050004A1 (en) * | 2019-09-09 | 2021-03-18 | Zero2.5 Biotech Pte. Ltd. | Apparatus for producing negative air ions |
| CN114731028A (en) * | 2019-09-09 | 2022-07-08 | 新微淨科技公司 | Device for generating air negative ions |
| CN114731028B (en) * | 2019-09-09 | 2023-03-21 | 新微淨科技公司 | Device for generating air negative ions |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100414 |