CN104734501A - Voltage reduction circuit - Google Patents
Voltage reduction circuit Download PDFInfo
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- CN104734501A CN104734501A CN201510135748.7A CN201510135748A CN104734501A CN 104734501 A CN104734501 A CN 104734501A CN 201510135748 A CN201510135748 A CN 201510135748A CN 104734501 A CN104734501 A CN 104734501A
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- circuit
- electronic circuit
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- voltage
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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
- H02M3/1563—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 without using an external clock
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a voltage reduction circuit. The voltage reduction circuit comprises a power supply input end, a power supply output end, an oscillation sub-circuit, a feedback sub-circuit, a switch sub-circuit and a filtering sub-circuit. The oscillation sub-circuit outputs a first control signal to the feedback sub-circuit. The feedback sub-circuit outputs a second control signal to the switch sub-circuit according to the first control signal. The switch sub-circuit outputs a first voltage signal to the filtering sub-circuit according to the second control signal. The filtering sub-circuit outputs a second voltage signal to the power supply output end according to the first voltage signal. The voltage reduction circuit is low in cost, the output voltage and the output current of the voltage reduction circuit can be flexibly regulated by only regulating the corresponding switch sub-circuit, and therefore the requirements for outputting the load voltage and current is flexibly regulated.
Description
Technical field
The application relates to electronic technology field, particularly relates to a kind of reduction voltage circuit.
Background technology
At present, DC-DC reduction voltage circuit has been widely used in various electronic product.Traditional DC-DC reduction voltage circuit adopts LDO(low dropout regulator usually, low pressure difference linear voltage regulator) or integrated circuit realize, usual employing PWM(pulse width modulation) mode step-down, but this kind of scheme cost is higher, and the ability of its input voltage range and output current depends on the switching device selected by reduction voltage circuit, the reduction voltage circuit that employing LDO under corresponding conventional art or integrated circuit realize, its switching device generally adopts inline form, can not freely change, therefore the adjustment underaction of its output voltage range and output current ability.
Summary of the invention
The main purpose of the application is to provide a kind of reduction voltage circuit, is intended to reduce costs, and realizes the flexible configuration to output loading electric current and voltage demand.
To achieve these goals, the reduction voltage circuit that the application provides comprises power input, power output end, vibration electronic circuit, feedback sub-circuit, switch electronic circuit and filtering electronic circuit, wherein,
The input of described vibration electronic circuit is connected with described power input, and output is connected with the input of described feedback sub-circuit; First output of described feedback sub-circuit is connected with the control end of described switch electronic circuit, and the second output is connected with described power output end; The input of described switch electronic circuit is connected with described power input, and output is connected with the input of described filtering electronic circuit; The output of described filtering electronic circuit is connected with described power output end;
Described vibration electronic circuit exports first and controls signal to described feedback sub-circuit, described feedback sub-circuit exports second according to described first control signal and controls signal to described switch electronic circuit, described switch electronic circuit exports the first voltage signal to described filtering electronic circuit according to described second control signal, and described filtering electronic circuit exports the second voltage signal to described power output end according to described first voltage signal.
Preferably, described reduction voltage circuit also comprises at least one first electric capacity, and described first electric capacity one end is connected with described power input, other end ground connection.
Preferably, described vibration electronic circuit comprises the first inverter, the first resistance and the second electric capacity, wherein, the output of described first inverter is connected with the input of described feedback sub-circuit, and the output of described first inverter is connected via the input of described first resistance with described first inverter; The input of described first inverter is via described second capacity earth; The power end of described first inverter is connected with described power input; The earth terminal ground connection of described first inverter.
Preferably, described feedback sub-circuit comprises the second inverter, NPN triode, voltage stabilizing didoe, the 3rd electric capacity, the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, wherein, the output of described second inverter is connected with the control end of described switch electronic circuit, and input is connected with the collector electrode of described NPN triode; The emitter of described NPN triode is connected with the negative electrode of described voltage stabilizing didoe, the plus earth of described voltage stabilizing didoe; The collector electrode of described NPN triode is connected via the output of described second resistance with described vibration electronic circuit; Described 5th resistance one end is connected with the base stage of described NPN triode, and the other end is via described 4th grounding through resistance; Described 5th resistance is connected with described 3rd resistance one end and described 3rd electric capacity one end respectively with the common port of the 4th resistance, and the described 3rd resistance other end and the described 3rd electric capacity other end are connected to described power output end respectively.
Preferably, described switch electronic circuit comprises PMOS pipe, and the grid of described PMOS pipe is the control end of described switch electronic circuit, and source electrode is the input of described switch electronic circuit, drains as the output of described switch electronic circuit.
Preferably, described switch electronic circuit also comprises fly-wheel diode, and the negative electrode of described fly-wheel diode is connected with the drain electrode of described PMOS, plus earth.
Preferably, described filtering electronic circuit comprises the first inductance and at least one 4th electric capacity, and described first inductance one end is connected with the output of described switch electronic circuit, and the other end is connected with described power output end; Described 4th electric capacity one end is connected with described power output end, other end ground connection.
The reduction voltage circuit that the application provides, export first by vibration electronic circuit and control signal to feedback sub-circuit, feedback sub-circuit exports second according to the first control signal and controls signal to switch electronic circuit, switch electronic circuit exports the first voltage signal to filtering electronic circuit according to the second control signal, and filtering electronic circuit exports the second voltage signal to power output end according to the first voltage signal.The reduction voltage circuit cost that the application provides is lower, and only just can be realized the flexible configuration of output voltage to this reduction voltage circuit and output current by the corresponding switch electronic circuit of configuration, thus achieves the flexible configuration to output loading voltage and current demand.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the application's reduction voltage circuit one embodiment.
The realization of the application's object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the application, and be not used in restriction the application.
The application provides a kind of reduction voltage circuit.
With reference to the schematic diagram that Fig. 1, Fig. 1 are the application's reduction voltage circuit one embodiment.
In the application's preferred embodiment, this reduction voltage circuit comprises power input Vin, power output end Vout, vibration electronic circuit 10, feedback sub-circuit 20, switch electronic circuit 30 and filtering electronic circuit 40, wherein, the input of vibration electronic circuit 10 is connected with power input Vin, and output is connected with the first input end of feedback sub-circuit 20; The output of feedback sub-circuit 20 is connected with the control end of switch electronic circuit 30, and the second input is connected with the output of filtering electronic circuit 40; The input of switch electronic circuit 30 is connected with power input Vin, and output is connected with the input of filtering electronic circuit 40; The output of filtering electronic circuit 40 is connected with power output end Vout;
Vibration electronic circuit 10 exports the first input end that first controls signal to feedback sub-circuit 20, filtering electronic circuit 40 exports the second input that second controls signal to feedback sub-circuit 20, feedback sub-circuit 20 exports the 3rd according to the first control signal and the second control signal and controls signal to switch electronic circuit 30, switch electronic circuit 30 exports the first voltage signal to filtering electronic circuit 40 according to the 3rd control signal, and filtering electronic circuit 40 exports the second voltage signal to power output end Vout according to the first voltage signal.
Further, reduction voltage circuit also comprises at least one first electric capacity C1, and first electric capacity C1 one end is connected with power input Vin, other end ground connection.It should be noted that the quantity of the first electric capacity C1 can be arranged according to actual needs, arrange 3 the first electric capacity C1 in the present embodiment, capacitance is set to 0.1uF, 0.1uF and 100uF respectively.
Particularly, vibration electronic circuit 10 comprises the first inverter U1, the first resistance R1 and the second electric capacity C2, wherein, the output of the first inverter U1 is connected with the input of feedback sub-circuit 20, and the output of the first inverter U1 is connected with the input of the first inverter U1 via the first resistance R1; The input of the first inverter U1 is via the second electric capacity C2 ground connection; The power end of the first inverter U1 is connected with power input Vin; The earth terminal ground connection of the first inverter U1.
In the present embodiment, the resistance of the first resistance R1 is set to 33K, and the capacitance of the second electric capacity C2 is set to 1500pF, and the external input voltage of power input Vin, the input voltage of the present embodiment is set to 12V.After the input voltage of 12V powers on, this vibration electronic circuit 10 is started working, and exports the square wave of 0-12V, and its duty ratio is 50%, and the party's wave frequency is set to fosc, then:
Particularly, feedback sub-circuit 20 comprises second inverter U2, NPN triode Q1, voltage stabilizing didoe D1, the 3rd electric capacity C3, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5, wherein, the output of the second inverter U2 is connected with the control end of switch electronic circuit 30, and input is connected with the collector electrode of NPN triode Q1; The emitter of NPN triode Q1 is connected with the negative electrode of voltage stabilizing didoe D1, the plus earth of voltage stabilizing didoe D1; The collector electrode of NPN triode Q1 is connected with the output of vibration electronic circuit 10 via the second resistance R2; 5th resistance R5 one end is connected with the base stage of NPN triode Q1, and the other end is via the 4th resistance R4 ground connection; 5th resistance R5 is connected with the 3rd resistance R3 one end and the 3rd electric capacity C3 one end respectively with the common port of the 4th resistance R4, and the 3rd resistance R3 other end and the 3rd electric capacity C3 other end are connected to power output end Vout respectively.
In the present embodiment, the Nom inalstability magnitude of voltage of voltage stabilizing didoe D1 is 2V, and the capacitance of the 3rd electric capacity C3 is set to 0.1uF, and the resistance of the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5 is set to 100K, 43K, 47K and 10K respectively.Wherein, second resistance R2 is current-limiting resistance, when the Q1 conducting of NPN triode, the output of the first inverter U1 can be made not by ground direct short-circuit, useless electric current due to what flow through when the Q1 conducting of NPN triode, if the second resistance R2 is too small, then can reduce circuit efficiency, therefore the second resistance R2 is set to 100K.
Particularly, switch electronic circuit 30 comprises P channel mosfet pipe Q2, and the grid of this MOSFET pipe Q2 connects the control end of switch electronic circuit 30, and source electrode is the input of switch electronic circuit 30, drains as the output of switch electronic circuit 30.
The selection of MOSFET pipe Q2 is relevant with the operating current needed for the input voltage of this reduction voltage circuit and load, wherein, the drain-source voltage VDS value of MOSFET pipe Q2 is greater than the input voltage of this reduction voltage circuit, and its leakage current ID should be greater than the operating current needed for load.For different loads, when the maximum operating currenbt needed for it is different, this reduction voltage circuit only need select corresponding MOSFET pipe Q2 just can realize, and namely just can be realized the relative flexible configuration of the output voltage to this reduction voltage circuit and output current parameter by the corresponding switch electronic circuit 30 of configuration.
Particularly, switch electronic circuit 30 also comprises sustained diode 2, and the negative electrode of sustained diode 2 is connected with the drain electrode of MOSFET pipe Q2, plus earth.If the forward conduction voltage of this sustained diode 2 is VF, when MOSFET pipe Q2 ends, the input voltage of above-mentioned filtering electronic circuit 40 (i.e. the first voltage signal) can be fixed on-VF current potential by this sustained diode 2, forms a complete loops with making filtering electronic circuit 40 and reference.Wherein, the reverse withstand voltage VRM of sustained diode 2 must be greater than the input voltage (being described for 12V in the present embodiment) of this reduction voltage circuit.
Particularly, filtering electronic circuit 40 comprises the first inductance L 1 and at least one 4th electric capacity C4, and first inductance L 1 one end is connected with the output of switch electronic circuit 30, and the other end is connected with power output end Vout; 4th electric capacity C4 one end is connected with power output end Vout, other end ground connection.
It should be noted that the quantity of the 4th electric capacity C4 can be arranged according to actual needs, arrange two the 4th electric capacity C4 in the present embodiment, its capacitance is respectively 0.1uF and 100uF.The inductance value of the first inductance L 1 is set to 220uH, and the output voltage of this reduction voltage circuit is relevant with the withstand voltage and rated current of the first inductance L 1 with output current parameter.The first voltage signal that this filtering electronic circuit 40 receiving key electronic circuit 30 exports, and filtering is carried out to this first voltage signal, export the second voltage signal, wherein, the second voltage signal is a direct voltage.
The reduction voltage circuit operation principle that the present embodiment provides is as follows:
The power input Vin of this reduction voltage circuit is inputted to the direct voltage of 12V, vibration electronic circuit 10 is started working, and exports the square-wave signal (i.e. the first control signal) of 0-12V, and its duty ratio is 50%, if the moment that power input Vin starts to have voltage to input is T0, then T0 moment MOSFET pipe Q2 conducting, the input voltage of filtering electronic circuit 40 rises gradually from 0V, thus the output voltage of power output end Vout rises gradually from 0V, if the target output voltage that this reduction voltage circuit is preset is 5V, then the base voltage of the 5V voltage exported by power output end Vout to NPN triode Q1 after the 3rd resistance R3 and the 4th resistance R4 dividing potential drop of feedback sub-circuit 20 is 2.6V, when the voltage that power supply outputs to Vout output is greater than 5V, then the base voltage of NPN triode Q1 is greater than 2.6V, namely reference voltage (the Nom inalstability voltage of voltage stabilizing didoe D1 and the base-emitter voltage Vbe sum of NPN triode Q1) is greater than, now NPN triode Q1 conducting, then feedback sub-circuit 20 exports high level, therefore MOSFET pipe Q2 ends, if this moment is T1, switch electronic circuit 30 is closed after the T1 moment, therefore the output voltage of filtering electronic circuit 40 is reduced to low level gradually by high level, the base voltage of NPN triode Q1 is caused to be less than 2.6V, NPN triode Q1 ends subsequently, feedback sub-circuit 20 output low level, then MOSFET pipe Q2 conducting, this moment is set to T2, therefore this reduction voltage circuit circulates according to said process, and then reach the stable object exporting target voltage.Wherein, T0 to T1 time period MOSFET pipe Q2 conducting, T1 to T2 time period MOSFET pipe Q2 ends, T0 to the T2 time period is one-period, the ratio that T0 to the T1 time period accounts for the whole cycle is duty ratio, and vibration electronic circuit 10 is with feedback sub-circuit 20 co-controlling MOSFET pipe Q2 output duty cycle and then reach the object regulating target output voltage.
Reverse breakdown voltage due to voltage stabilizing didoe D1 is 2V, and the base emitter interpolar voltage VBE of NPN triode Q1 is 0.6V, the resistance of the 3rd resistance R3 is 43K, and the resistance of the 4th resistance R4 is 47K, when this reduction voltage circuit normally works, output voltage computing formula is as follows:
Namely the reduction voltage circuit that the present embodiment provides achieves the conversion of the direct voltage from 12V to 5V.
The reduction voltage circuit that the application provides, export first by vibration electronic circuit 10 and control signal to feedback sub-circuit 20, feedback sub-circuit 20 exports second according to the first control signal and controls signal to switch electronic circuit 30, switch electronic circuit 30 exports the first voltage signal to filtering electronic circuit 40 according to the second control signal, and filtering electronic circuit 40 exports the second voltage signal to power output end Vout according to the first voltage signal.The reduction voltage circuit cost that the application provides is lower, and only just can be realized the flexible configuration of input voltage to this reduction voltage circuit and output current by the corresponding switch electronic circuit 30 of configuration, thus achieves the flexible configuration to output load current demand.
Claims (7)
1. a reduction voltage circuit, it is characterized in that, comprise power input, power output end, vibration electronic circuit, feedback sub-circuit, switch electronic circuit and filtering electronic circuit, wherein, the input of described vibration electronic circuit is connected with described power input, and output is connected with the input of described feedback sub-circuit; First output of described feedback sub-circuit is connected with the control end of described switch electronic circuit, and the second output is connected with described power output end; The input of described switch electronic circuit is connected with described power input, and output is connected with the input of described filtering electronic circuit; The output of described filtering electronic circuit is connected with described power output end;
Described vibration electronic circuit exports first and controls signal to described feedback sub-circuit, described feedback sub-circuit exports second according to described first control signal and controls signal to described switch electronic circuit, described switch electronic circuit exports the first voltage signal to described filtering electronic circuit according to described second control signal, and described filtering electronic circuit exports the second voltage signal to described power output end according to described first voltage signal.
2. the reduction voltage circuit as described in claim 1, is characterized in that, described reduction voltage circuit also comprises at least one first electric capacity, and described first electric capacity one end is connected with described power input, other end ground connection.
3. the reduction voltage circuit as described in claim 1, it is characterized in that, described vibration electronic circuit comprises the first inverter, the first resistance and the second electric capacity, wherein, the output of described first inverter is connected with the input of described feedback sub-circuit, and the output of described first inverter is connected via the input of described first resistance with described first inverter; The input of described first inverter is via described second capacity earth; The power end of described first inverter is connected with described power input; The earth terminal ground connection of described first inverter.
4. the reduction voltage circuit as described in claim 1, it is characterized in that, described feedback sub-circuit comprises the second inverter, NPN triode, voltage stabilizing didoe, the 3rd electric capacity, the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, wherein, the output of described second inverter is connected with the control end of described switch electronic circuit, and input is connected with the collector electrode of described NPN triode; The emitter of described NPN triode is connected with the negative electrode of described voltage stabilizing didoe, the plus earth of described voltage stabilizing didoe; The collector electrode of described NPN triode is connected via the output of described second resistance with described vibration electronic circuit; Described 5th resistance one end is connected with the base stage of described NPN triode, and the other end is via described 4th grounding through resistance; Described 5th resistance is connected with described 3rd resistance one end and described 3rd electric capacity one end respectively with the common port of the 4th resistance, and the described 3rd resistance other end and the described 3rd electric capacity other end are connected to described power output end respectively.
5. the reduction voltage circuit as described in claim 1, it is characterized in that, described switch electronic circuit comprises PMOS pipe, and the grid of described PMOS pipe is the control end of described switch electronic circuit, source electrode is the input of described switch electronic circuit, drains as the output of described switch electronic circuit.
6. the reduction voltage circuit as described in claim 5, is characterized in that, described switch electronic circuit also comprises fly-wheel diode, and the negative electrode of described fly-wheel diode is connected with the drain electrode of described PMOS pipe, plus earth.
7. the reduction voltage circuit as described in claim 1, is characterized in that, described filtering electronic circuit comprises the first inductance and at least one 4th electric capacity, and described first inductance one end is connected with the output of described switch electronic circuit, and the other end is connected with described power output end; Described 4th electric capacity one end is connected with described power output end, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135748.7A CN104734501A (en) | 2015-03-26 | 2015-03-26 | Voltage reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135748.7A CN104734501A (en) | 2015-03-26 | 2015-03-26 | Voltage reduction circuit |
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| Publication Number | Publication Date |
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| CN104734501A true CN104734501A (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510135748.7A Pending CN104734501A (en) | 2015-03-26 | 2015-03-26 | Voltage reduction circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021203649A1 (en) * | 2020-04-07 | 2021-10-14 | 深圳市爱图仕影像器材有限公司 | Drive circuit of liquid crystal shutter, liquid crystal shutter, and led lamp |
-
2015
- 2015-03-26 CN CN201510135748.7A patent/CN104734501A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021203649A1 (en) * | 2020-04-07 | 2021-10-14 | 深圳市爱图仕影像器材有限公司 | Drive circuit of liquid crystal shutter, liquid crystal shutter, and led lamp |
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Application publication date: 20150624 |