CN1740935A - Switch type DC voltage-stabilizing circuit - Google Patents
Switch type DC voltage-stabilizing circuit Download PDFInfo
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- CN1740935A CN1740935A CN 200410041868 CN200410041868A CN1740935A CN 1740935 A CN1740935 A CN 1740935A CN 200410041868 CN200410041868 CN 200410041868 CN 200410041868 A CN200410041868 A CN 200410041868A CN 1740935 A CN1740935 A CN 1740935A
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Abstract
The present invention relates to a switching DC voltage-stabilizing circuit. A DC high-voltage power supply is series-connected with first switching circuit, current limiting buffer circuit and charging capacitor to charge the charging capacitor; voltage output end of charging capacitor is connected with voltage-stabilizing output end and voltage feedback circuit formed from voltage stabilizing diode, the feedback voltage is taken out and inputted into second switching circuit to control switching-on and switching-off of second switching circuit. The output end of second switching circuit is connected with first switching circuit, and output end of control signal source is connected with second switching circuit to control switching-on and switching-off of first switching circuit.
Description
(1) technical field: the present invention relates to the switching mode voltage stabilizer technical field, be specially the switching mode direct current regulation circuit in the switching mode voltage stabilizer.
(2) background technology: switching mode voltage stabilizer mainly is made up of current rectifying and wave filtering circuit and switching mode direct current regulation circuit.Wherein the block scheme of existing switching mode direct current regulation circuit chief component is adjusted pipe and is worked on off state as shown in Figure 1 among Fig. 1.Its voltage stabilizing principle of work is: by the DC voltage V of current rectifying and wave filtering circuit input
IBecome square-wave voltage by switch adjustment pipe 1, the effect through wave filter 5 becomes VD V again
oBy 8 pairs of output voltage V of sample circuit
oSampling voltage and reference voltage 7 through comparison amplifier 6 difference relatively, regulate the width of pulse width modulator 3 pulsating wave of exporting, utilize this to transfer wide type pulse control signal, through driver 2 input switch adjustment pipes 1, gauge tap adjustment pipe conducting and the time that ends: when the output end of stabilized voltage supply external load increases, the pulse control signal pulsewidth of output broadens, and switch adjustment pipe ON time is elongated, output voltage V
oDynamically uprise; When external load diminishes, with last inverse process, output voltage V
oDynamically step-down has stable voltage output thereby keep power output end.Pulse oscillating device 4 is to the first-class broad pulse control signal of pulse width modulator 3 outputs among Fig. 1.
In Fig. 1 block diagram circuit, V
o=V
ID, V
o, V
IBe respectively direct current output, input voltage, D is the dutycycle of pulse width modulator output pulse control signal.Output voltage V
oBe directly proportional with the dutycycle D of pulse control signal.
Switching mode mu balanced circuit shown in Figure 1 belongs to transfers the pulse width type mu balanced circuit, and its major advantage is the power attenuation that can reduce to adjust pipe, and the main shortcoming that exists is: one is not suitable for being applied to the DC voltage-stabilizing output of low-voltage, high-current: for V
I-V
oThe voltage transformation amplitude is big, for example in order to save power transformer, directly the 220V ac voltage rectifier is filtered into high direct voltage, DC input voitage as mu balanced circuit, if load this moment needs the situation of low-voltage, high-current DC voltage-stabilizing output (for example output of the low-voltage and high-current about 1V), adopt Fig. 1 mu balanced circuit, dutycycle D value is very little, it is very short to adjust the pipe ON time, carries only chronicly, and the two differs too big, control very difficult, current ripples can occur this moment and increase, the barretter on-state loss increases synchronously, problems such as direct current transformation voltage stabilizing efficient reduction.Its two, when power source loads changed fast, sample circuit was from output voltage V in Fig. 1 circuit
oTake out feedback voltage, through each square frame functional circuit of Fig. 1, up to control to switch adjustment pipe turn on process, the process of whole transmission feedback will consume certain hour, adjustment or variation to output voltage lag behind load variations, can not transient response or summary responses, dynamic less stress or over-control appear in DC voltage-stabilizing output.When the big low-voltage, high-current voltage stabilizing of load variations rate was exported, this phenomenon was even more serious.
(3) summary of the invention: the present invention is directed to above-mentioned shortcoming, another kind of switching mode direct current regulation circuit is provided, it can satisfy the requirement of low-voltage, high-current voltage stabilizing output, and the quick variation of its voltage stabilizing output and power source loads is irrelevant.
Technical scheme of the present invention is as follows:
By DC high-voltage power supply be connected in series first on-off circuit, current limliting buffer circuit and charging capacitor, high-voltage power supply is charged to charging capacitor with the pulsating current form, and the voltage output end of charging capacitor connects output end of pressure-stabilizing; The voltage output end of charging capacitor connects voltage feedback circuit, takes out feedback voltage signal input second switch circuit, the break-make of control second switch circuit, and the output terminal of second switch circuit is connected with another input end of first on-off circuit; The output terminal in control signal source connects another input end of second switch circuit, controls the break-make of first on-off circuit by the second switch circuit.
The principle of DC voltage-stabilizing of the present invention or method are described different fully with background technology, the latter recently regulates voltage stabilizing output by the duty of regulating impulse control signal, the pressure limiting that the present invention controls charging capacitor intermittent charge, intermittent discharge and feedback voltage by DC high-voltage power supply by first on-off circuit is used for regulating voltage stabilizing output, and first on-off circuit is as charge switch.
The conducting of first on-off circuit or control by connecing the second switch circuit by a control signal subject string, second switch circuit be as the control signal switch, the conducting of second switch circuit or by being controlled by the feedback voltage of charging capacitor output voltage.Described control signal is first-class wide pulse signal, and dutycycle is a definite value.During low-voltage, high-current voltage stabilizing output, do not exist the big technology of change in duty cycle described in the background technology to lack limit.The height of its output voltage can realize that the voltage stabilizing output valve can be chosen arbitrarily by the height of adjusting feedback voltage.Therefore the present invention can satisfy the requirement of low-voltage, high-current voltage stabilizing output fully, and can satisfy the requirement of big voltage stabilized range.During high voltage stability output, as long as first on-off circuit has sufficiently high withstand voltage.
The present invention adopts intermittent charge and discharge mode of operation, the electric charge of on-off circuit of flowing through all is used to charge and is consumed in intermittent discharge to load, reactive power consumption is extremely low, voltage stabilizing output efficiency height, when particularly the miniwatt voltage stabilizing is exported (for example 1-10V), by the optimized choice to the switch circuit performance, efficient can reach more than 95%, and the efficient of the switching power supply of existing 1V voltage stabilizing output is generally 87%.
By the above, voltage stabilizing output valve of the present invention only depends on the feedback voltage value, and with the pulsewidth or the independent of duty cycle of control signal, therefore irrelevant with the rate of change of external load, do not exist external load to change less stress or the over-control that causes voltage stabilizing output.The variation of external load only changes the frequency of capacitor charge or discharge.
The present invention can save comparison amplifier in the existing switching mode voltage stabilizer, pulse width modulator, driver etc., has advantage simple in structure, that volume is little, cost is low.
(4) description of drawings:
Fig. 1 is the block scheme of existing switching mode direct current regulation circuit structure;
Fig. 2 is the block scheme of circuit structure of the present invention;
Fig. 3 is the circuit diagram of the embodiment of the invention 1;
Fig. 4 is the circuit diagram of example 2 of the present invention.
(5) embodiment:
See Fig. 2, DC high-voltage power supply 1 is the high direct voltage by current rectifying and wave filtering circuit output, DC high-voltage power supply 1 be connected in series first on-off circuit 2, current limliting buffer circuit 3 and charging capacitor 4, DC high-voltage power supply is charged to charging capacitor 4 through the current limliting buffer circuit with the pulsating current form, and the voltage output end of charging capacitor 4 connects output end of pressure-stabilizing 5; The voltage output end of charging capacitor 4 connects voltage feedback circuit 6 in addition, the output terminal of voltage feedback circuit 6 connects second switch circuit 7, take out feedback voltage signal input second switch circuit 7 thus, the break-make of control second switch circuit, the output terminal of second switch circuit 7 is connected with another input end of first on-off circuit 2; The output terminal in control signal source 8 connects another input end of second switch circuit, controls the break-make of first on-off circuit by the second switch circuit, controls the intermittent charge of 1 pair of charging capacitor 4 of high-voltage power supply thus.
Fig. 3, Fig. 4 are two specific embodiments of the present invention.
See Fig. 3, described first on-off circuit is by field effect transistor Q
2And resistance R
2Form resistance R
2Be connected in field effect transistor Q
2Grid and source electrode between, field effect transistor Q
2Source electrode and DC high-voltage power supply V
IConnect DC high-voltage power supply V
IOther end ground connection; Described current limliting buffer circuit is by fusing resistor R
1, inductor L
1And diode D
1Form fusing resistor R
1With inductor L
1Be connected in series fusing resistor R
1The other end respectively with the brilliant utmost point pipe of field effect Q
2Drain electrode and diode D
1One end connects, diode D
1Other end ground connection; Fusing resistor R wherein
1Be fuse, its effect is when first on-off circuit breaks down or be out of control, can pass through fusing resistor R
1The external circuits of table protection voltage stabilizing output.Diode D
1Be fly-wheel diode, when first on-off circuit by instantaneous, diode D
1Conducting, itself and fusing resistor R
1, inductor L
1Form current return, inductor L
1In electric energy can continue to capacitor C
1Charging.When the first on-off circuit conducting instantaneous, diode D
1End, electric energy at first flows into inductor L
1, so to capacitor C
1Play the current limliting buffer action.
Charging capacitor C
1Voltage output end respectively with inductor L
1And output end of pressure-stabilizing V
oConnect charging capacitor C
1Other end ground connection; Described voltage stabilizing diode D
2An end and charging capacitor C
IVoltage output end connect the transistor Q in the other end and the described second switch circuit
1Base stage connect, constitute voltage feedback circuit, the second switch circuit also comprises the capacitor C of serial connection
2, capacitor C
3, serial connection point and transistor Q
1Collector connect transistor Q
1Collector by capacitor C
2With transistor Q
2Grid connect transistor Q
1Grounded emitter; Control signal source V
SOutput terminal by capacitor C
3With transistor Q
1Collector connect, export wide pulse control signal, by described second switch circuit controlling filed effect transistor Q
2Break-make, signal source V
SOther end ground connection.
Present embodiment circuit working principle is as follows: as the field effect transistor Q of first on-off circuit
2During conducting, high-voltage power supply V
IPass through resistance R
1, inductor L
1To capacitor C
1Charging is as capacitor C
1The output end voltage value is higher than voltage stabilizing diode D
2The voltage stabilizing value, diode D
2Puncture transistor Q
1Conducting, control signal source V
SOutput signal can not pass through C
2Be added to transistor Q
2Grid, transistor Q
2Be in cut-off state, stop capacitor C
1Charging, capacitor C
1By load discharge, when its output end voltage value is lower than voltage stabilizing diode D
2The voltage stabilizing value, voltage stabilizing diode recovers normal condition, transistor Q
1End control signal source V
SThat exports waits wide pulse signal through capacitor C
3, C
2Be added to transistor Q
2Grid, transistor Q
2Conducting recovers capacitor C
1Charging, so constantly circulation keep the stable voltage output of output end of pressure-stabilizing, and this voltage stabilizing output valve is by voltage stabilizing diode D
2Voltage stabilizing value decision.Adjust different voltage stabilizing output valves, constitute voltage feedback loop as long as choose the voltage stabilizing diode with different voltage stabilizing values, structure is extremely simple.When the voltage stabilizing output valve is low, voltage stabilizing diode D
2Also can replace, utilize its dead band voltage as feedback voltage by the diode that adds forward voltage.Perhaps, charging capacitor C
1Voltage output end transistor Q directly and in the second switch circuit
1Base stage connect capacitor C
1Output voltage directly as feedback voltage.
In embodiment illustrated in fig. 3, also can be with transistor Q
1Use positive-negative-positive instead by the NPN type, field effect transistor Q
2Use the N channel-type instead by the P channel-type, power supply V
IAnd diode D
1, D
2The connection respective opposed.So can export the voltage stabilizing negative voltage.Fusing resistor R among Fig. 3
1Also can.
See Fig. 4, present embodiment is with the capacitor C in the second switch circuit among Fig. 3
3And C
2Use the resistance R among Fig. 4 respectively
3And transistor Q
2Replace, with the field effect transistor Q in first on-off circuit among Fig. 3
2With the Darlington transistor Q among Fig. 4
3, Q
4Replace, other circuit connecting relations are identical.Its circuit connects as follows:
First on-off circuit is by Darlington transistor Q
3, Q
4And resistance R
2Constitute resistance R
2Be connected to the base stage of Darlington transistor, the emitter of Darlington transistor and described high-voltage power supply V
IConnect high-voltage power supply V
IOther end ground connection; The current limliting buffer circuit is by fusing resistor R
1, inductor L
1And diode D
1Form fusing resistor R
1With inductor L
1Be connected in series fusing resistor R
1The other end respectively with the collector and the diode D of Darlington transistor
1An end connect diode D
1Other end ground connection; Charging capacitor C
1Voltage output end respectively with inductor L
1And output end of pressure-stabilizing V
oConnect charging capacitor C
1Other end ground connection; Voltage stabilizing diode D
2An end and charging capacitor C
1Voltage output end connect the transistor Q in the other end and the described second switch circuit
1Base stage connect, constitute voltage feedback circuit, the second switch circuit also comprises resistance R
3And transistor Q
2, resistance R
3Be series at transistor Q
2Base stage, serial connection point and transistor Q
1Collector connect transistor Q
2Collector and resistance R
2The other end connect transistor Q
2Grounded emitter; Control signal source V
SOutput terminal pass through resistance R
3With transistor Q
1Collector connect, by described second switch circuit oxide-semiconductor control transistors Q
3, Q
4Break-make, signal source V
SOther end ground connection.
See Fig. 4, as capacitor C
1Charging voltage be higher than voltage stabilizing diode D
2The voltage stabilizing value, transistor Q
1Conducting, transistor Q
2End Darlington transistor Q
3, Q
4End power supply V
IStop capacitor C
1Charging, capacitor C
1To load discharge, when its output end voltage is lower than voltage stabilizing diode D
2The voltage stabilizing value, transistor Q
1End, the output signal voltage 4 in control signal source is through resistance R
3Order about triode Q
2Darlington transistor Q is ordered about in conducting then
3, Q
4Conducting, power supply V
IRecovery is to capacitor C
1Charging, circulation and so forth, the output voltage stabilization that makes output end of pressure-stabilizing is in voltage stabilizing diode D
2The voltage stabilizing value.
In embodiment illustrated in fig. 42, each transistor also can replace with positive-negative-positive by the NPN type, power supply V
IAnd diode D
1, D
2The connection respective opposed.
Among Fig. 3 embodiment, components and parts model and parameter value can be: power supply V
I300V, field effect transistor Q
2Model J2N5462, transistor Q
1Model MP35770, capacitor C
110 μ F, C
2200PF, C
3200PF, R
1Be the 2A fuse, inductor L
1Be 10 μ H, voltage stabilizing diode D
2Model IN4733, the voltage stabilizing value is 5V.Control signal is the pulsating wave of frequency 100KHZ, dutycycle 50%.
Among Fig. 4 embodiment, power supply V
I300V, Darlington transistor model MPQ200J, transistor Q
1And Q
2Model MP35770, voltage stabilizing diode D
2Model IN4733, voltage stabilizing value 5V.Capacitor C
1100 μ F, resistance R
3LK Ω, R
1Be the 10A fuse, inductor L
1Be 100 μ H, the control signal source is with embodiment 3.
Among Fig. 3, Fig. 4 embodiment, described interconnective first on-off circuit, second switch circuit and the control signal source method for making with integrated circuit can be integrated in one respectively, be made into integrated circuit.
Claims (7)
1, switching mode direct current regulation circuit, be characterised in that by DC high-voltage power supply be connected in series first on-off circuit, current limliting buffer circuit and charging capacitor, high-voltage power supply is charged to charging capacitor with the pulsating current form, and the voltage output end of charging capacitor connects output end of pressure-stabilizing; The voltage output end of charging capacitor connects voltage feedback circuit, takes out feedback voltage signal input second switch circuit, the break-make of control second switch circuit, and the output terminal of second switch circuit is connected with another input end of first on-off circuit; The output terminal in control signal source connects another input end of second switch circuit, controls the break-make of first on-off circuit by the second switch circuit.
2, by the described switching mode direct current regulation circuit of claim 1, it is characterized in that described voltage feedback circuit is made of voltage stabilizing diode.
3, by the described switching mode direct current regulation circuit of claim 1, it is characterized in that described voltage feedback circuit is made of the diode that adds forward voltage.
4, by the described switching mode direct current regulation circuit of claim 1, it is characterized in that the voltage output end of described charging capacitor directly is connected with the second switch circuit.
5, by claim 1 or 2 described switching mode direct current regulation circuits, it is characterized in that described first on-off circuit is by field effect transistor Q
2And resistance R
2Form resistance R
2Be connected in field effect transistor Q
2Grid and source electrode between, field effect transistor Q
2Source electrode and DC high-voltage power supply V
IConnect DC high-voltage power supply V
IOther end ground connection; Described current limliting buffer circuit is by fusing resistor R
1, inductor L
1And diode D
1Form fusing resistor R
1With inductor L
1Be connected in series fusing resistor R
1The other end respectively with the brilliant utmost point pipe of field effect Q
2Drain electrode and diode D
1One end connects, diode D
1Other end ground connection; Described charging capacitor C
1Voltage output end respectively with inductor L
1And output end of pressure-stabilizing V
0Connect charging capacitor C
1Other end ground connection; Described voltage stabilizing diode D
2An end and charging capacitor C
1Voltage output end connect the transistor Q in the other end and the described second switch circuit
1Base stage connect, constitute voltage feedback circuit, the second switch circuit also comprises the capacitor C of serial connection
2, capacitor C
3, serial connection point and transistor Q
1Collector connect transistor Q
1Collector by capacitor C
2With transistor Q
2Grid connect transistor Q
1Grounded emitter; Control signal source V
SOutput terminal by capacitor C
3With transistor Q
1Collector connect, export wide pulse control signal, by described second switch circuit controlling filed effect transistor Q
2Break-make, the other end ground connection of signal source VS.
6, by claim 1 or 2 described switching mode direct current regulation circuits, it is characterized in that described first on-off circuit is by Darlington transistor Q
3, Q
4And resistance R
2Constitute resistance R
2Be connected to the base stage of Darlington transistor, the emitter of Darlington transistor and described high-voltage power supply V
IConnect high-voltage power supply V
IOther end ground connection; Described current limliting buffer circuit is by fusing resistor R
1, inductor L
1And diode D
1Form fusing resistor R
1With inductor L
1Be connected in series fusing resistor R
1The other end respectively with the collector and the diode D of Darlington transistor
1An end connect diode D
1Other end ground connection; Described charging capacitor C
1Voltage output end respectively with inductor L
1And output end of pressure-stabilizing V
0Connect charging capacitor C
1Other end ground connection; Voltage stabilizing diode D
2An end and charging capacitor C
1Voltage output end connect the transistor Q in the other end and the described second switch circuit
1Base stage connect, constitute voltage feedback circuit, the second switch circuit also comprises resistance R
3And transistor Q
2, resistance R
3Be series at transistor Q
2Base stage, serial connection point and transistor Q
1Collector connect transistor Q
2Collector and resistance R
2The other end connect transistor Q
2Grounded emitter; Control signal source V
sOutput terminal pass through resistance R
3With transistor Q
1Collector connect, by described second switch circuit oxide-semiconductor control transistors Q
3, Q
4Break-make, signal source V
SOther end ground connection.
7, by the described switching mode direct current regulation circuit of claim 1, it is characterized in that described interconnective first on-off circuit, second switch circuit and control signal source are the integrated circuit that is integrated in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410041868 CN1740935A (en) | 2004-08-28 | 2004-08-28 | Switch type DC voltage-stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410041868 CN1740935A (en) | 2004-08-28 | 2004-08-28 | Switch type DC voltage-stabilizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1740935A true CN1740935A (en) | 2006-03-01 |
Family
ID=36093350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410041868 Pending CN1740935A (en) | 2004-08-28 | 2004-08-28 | Switch type DC voltage-stabilizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1740935A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471574B (en) * | 2007-12-28 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Current limiter |
| CN105242737A (en) * | 2015-11-06 | 2016-01-13 | 广州金升阳科技有限公司 | Ripple current generation method and circuit |
| CN108472007A (en) * | 2015-11-02 | 2018-08-31 | 皇家飞利浦有限公司 | The active distributed of high-voltage power supply for ultrasonic transducer |
-
2004
- 2004-08-28 CN CN 200410041868 patent/CN1740935A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471574B (en) * | 2007-12-28 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Current limiter |
| CN108472007A (en) * | 2015-11-02 | 2018-08-31 | 皇家飞利浦有限公司 | The active distributed of high-voltage power supply for ultrasonic transducer |
| CN105242737A (en) * | 2015-11-06 | 2016-01-13 | 广州金升阳科技有限公司 | Ripple current generation method and circuit |
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