CN202085072U - Switch-type DC (direct current) stabilized power supply - Google Patents
Switch-type DC (direct current) stabilized power supply Download PDFInfo
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- CN202085072U CN202085072U CN2011202006396U CN201120200639U CN202085072U CN 202085072 U CN202085072 U CN 202085072U CN 2011202006396 U CN2011202006396 U CN 2011202006396U CN 201120200639 U CN201120200639 U CN 201120200639U CN 202085072 U CN202085072 U CN 202085072U
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Abstract
The utility model relates to a switch-type DC (direct current) voltage-stabilizing circuit and discloses a switch-type DC stabilized power supply which aims to overcome the defects of complicated circuit structure and high cost in the prior art. The switch-type DC stabilized power supply adopts the technical scheme that the switch-type DC stabilized power supply comprises a first switch, a second switch and a voltage comparator; the first switch and the second switch are connected in series to the two ends of input voltage; a connection point of the first switch and the second switch serves as an output end; two input ends of the voltage comparator are connected with reference voltage and the output end respectively; the output end of the voltage comparator is connected with the control end of the first switch and the control end of the second switch; and when the voltage of the output end is higher or lower than the reference voltage, the voltage comparator can output two modes which respectively correspond to the breakover and the turn-off of the first and the second switches, that is, when the first switch is under breakover, the second switch is under turn-off, and when the second switch is under breakover, and the first switch is under turn-off. The switch-type DC stabilized power supply has the advantages of greatly simplified circuit structure and lowered cost.
Description
Technical field
The utility model relates to DC-DC (DC-to-DC) converter, particularly a kind of switching mode direct current regulation circuit.
Background technology
The DC-DC converter is also referred to as power inverter, Switching Power Supply, D.C. regulated power supply etc., has developed into the digital circuit of today from traditional analog circuit.The D.C. regulated power supply of prior art, its voltage regulation way comprises pulse-width-modulated mode, english abbreviation is PWM (Pulse width Modulation), and pulse over-cycle phase modulating mode, english abbreviation are PSM control modes such as (Pulse Skip Modulation).Its basic control principle is: sample circuit is sampled to output voltage, and itself and reference voltage are compared, and according to the situation of change of output voltage, adjusts the switching tube driving pulse, thereby makes output voltage stabilization in set point.Fig. 1 is the circuit structure diagram of prior art pwm pattern.When sample circuit detects output voltage V o variation, delivering to the PWM controller after the detected signal amplification shaping, the PWM controller is handled this signal, adjust the driving pulse of switch transistor T 1 grid, thereby the conducting of control switch pipe T1 and by the time reaches the purpose of adjusting output voltage V o.Among Fig. 1, inductance L 1 and capacitor C 1 are formed filter circuit, and diode D1 shields, and resistance R is load, and Vin is an input voltage.Above-mentioned control mode complex circuit designs, device is many, the cost height, wherein the PWM controller comprises pulse generator, waveform control circuit etc. at least, needs the special driving chip, feedback circuit control also is inconvenient to design, and is very difficult.PSM control mode circuit structure is more complicated.
The utility model content
Technical problem to be solved in the utility model is exactly the DC-stabilized circuit complex structure at prior art, and the shortcoming that cost is high provides a kind of switching mode D.C. regulated power supply, simplifies circuit structure, reduces cost.
The utility model solve the technical problem, the technical scheme that adopts is that the switching mode D.C. regulated power supply comprises first switch, second switch and voltage comparator, described first switch and second switch are connected on the input voltage two ends, and the tie point of described first switch and second switch is an output; One of two input of described voltage comparator connect reference voltage, and one connects output, and described voltage comparator output is connected with the control end of described first switch and second switch; When output end voltage was higher or lower than reference voltage, described voltage comparator can be exported two states, the turn-on and turn-off of respectively corresponding described first switch and second switch; During described first switch conduction, described second switch turn-offs, and during described second switch conducting, described first switch turn-offs.
Concrete, described reference voltage is obtained by first resistance that is connected on the input voltage two ends and second electric resistance partial pressure.
Further, it is high-end that described first switch connects input voltage, and described second switch connects the input voltage low side; When output end voltage is higher than reference voltage, described second switch conducting; When output end voltage was lower than reference voltage, described first switch conduction, described input voltage low side were the common port of input voltage and output voltage.
Concrete, described first switch and second switch are transistor.
More specifically, described transistor is a field-effect transistor, and described control end is the grid of field-effect transistor; Perhaps, described transistor is a bipolar transistor, and described control end is the base stage of bipolar transistor; Perhaps, described transistor is an insulated gate bipolar transistor, and described control end is the grid of insulated gate bipolar transistor.
Preferably, described first switch is the P-channel field-effect transistor (PEFT) transistor, and described second switch is the N slot field-effect transistor; It is high-end that described P-channel field-effect transistor (PEFT) transistor drain connects input voltage, and source electrode connects N slot field-effect transistor drain electrode and as output; Described N slot field-effect transistor source electrode connects the input voltage low side.
Further, described first switch connects the input voltage low side, and it is high-end that described second switch connects input voltage; When output end voltage is higher than reference voltage, described voltage comparator output high level, described first switch conduction; When output end voltage is lower than reference voltage, described voltage comparator output low level, described second switch conducting, described input voltage is high-end to be the common port of input voltage and output voltage.
Concrete, described first switch and second switch are transistor.
More specifically, described transistor is a field-effect transistor, and described control end is the grid of field-effect transistor; Perhaps, described transistor is a bipolar transistor, and described control end is the base stage of bipolar transistor; Perhaps, described transistor is an insulated gate bipolar transistor, and described control end is the grid of insulated gate bipolar transistor.
Preferably, described first switch is the N slot field-effect transistor, and described second switch is the P-channel field-effect transistor (PEFT) transistor; Described N slot field-effect transistor source electrode connects the input voltage low side, and drain electrode connects the P-channel field-effect transistor (PEFT) transistor source and as output; It is high-end that described P-channel field-effect transistor (PEFT) transistor drain connects input voltage.
The beneficial effects of the utility model are, have simplified circuit structure greatly, have reduced component number, and the feedback circuit controlling Design is very simple, does not need the special driving control chip, and circuit cost reduces greatly.
Description of drawings
Fig. 1 is the DC-stabilized circuit structural representation of prior art;
Fig. 2 is the electrical block diagram of embodiment 1;
Fig. 3 is the electrical block diagram of embodiment 2;
Fig. 4 is the electrical block diagram of embodiment 3.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
Switching mode D.C. regulated power supply of the present utility model comprises first switch, second switch and voltage comparator.First switch and second switch are connected on the input voltage two ends, and the tie point of first switch and second switch is the utility model switching mode direct current regulation circuit output.One of two input of voltage comparator connect reference voltage, and one connects output, and the voltage comparator output is connected with the control end of first switch and second switch.When output end voltage was higher or lower than reference voltage, voltage comparator can be exported two states, the turn-on and turn-off of corresponding first switch of difference and second switch, and when first switch conduction, second switch turn-offs; Otherwise when the second switch conducting, first switch turn-offs.
If it is high-end that first switch connects input voltage, second switch connects the input voltage low side, and when first switch conduction, output end voltage is elevated, and during the second switch conducting, output end voltage is dragged down.The utility model according to the variation of output end voltage, drives the conducting of first switch and second switch respectively just, and output end voltage is changed round about, thereby obtains stable voltage at output, and this voltage equals reference voltage.According to above-mentioned operation principle, no matter input voltage is positive voltage or negative voltage, and the absolute value of reference voltage (output end voltage) can be greater than the absolute value of input voltage.
According to the different annexations of two inputs (normal phase input end and negative-phase input) with the reference voltage and the output end voltage of voltage comparator, the two states of comparator output concerns that with the height of output end voltage and reference voltage different corresponding relations can be arranged.If the normal phase input end of voltage comparator connects output end voltage, negative-phase input connects reference voltage, when output end voltage is higher than reference voltage, and voltage comparator output high level, otherwise output low level then; If the negative-phase input of voltage comparator connects output end voltage, normal phase input end connects reference voltage, when output end voltage is higher than reference voltage, and the voltage comparator output low level, on the contrary then export high level.In conjunction with first switch and second switch different driving mode (low level conducting or high level conducting), circuit of the present utility model can have multiple compound mode.
Embodiment 1
Referring to Fig. 2, this routine switching mode D.C. regulated power supply, comprise first resistance R 1 and second resistance R 2 that are connected on the input voltage vin two ends, be connected on the first switch P slot field-effect transistor Q1 and the second switch N slot field-effect transistor Q2 at input voltage two ends, and voltage comparator U1.Among Fig. 2, it is high-end that P-channel field-effect transistor (PEFT) transistor Q1 drain electrode connects input voltage vin, and source electrode connects N slot field-effect transistor Q2 drain electrode, and this tie point is the output of this routine circuit.N slot field-effect transistor Q2 source electrode connects the input voltage vin low side.This routine input voltage vin is a positive voltage, and the input voltage vin low side is the common port of this routine circuit, i.e. the common port of input voltage and output voltage (earth terminal G).This routine reference voltage V t is obtained by first resistance R 1 and 2 pairs of input voltage vin dividing potential drops of second resistance R, i.e. the tie point voltage of first resistance R 1 and second resistance R 2 among Fig. 2.Two of voltage comparator U1 one of inputs connect reference voltage V t among Fig. 2, and one connects output end voltage Vo, and the output of voltage comparator U1 is connected with the control end grid of N slot field-effect transistor Q2 with P-channel field-effect transistor (PEFT) transistor Q1.The voltage stabilizing dynamic process of this routine circuit is: when output end voltage Vo was higher than reference voltage V t, voltage comparator U1 exported high level, N slot field-effect transistor Q2 conducting, and P-channel field-effect transistor (PEFT) transistor Q1 turn-offs, and output voltage V o is dragged down; When output end voltage Vo is lower than reference voltage V t, voltage comparator U1 output low level, P-channel field-effect transistor (PEFT) transistor Q1 conducting, N slot field-effect transistor Q2 turn-offs, and output voltage V o is elevated.Said process makes output voltage V o be stabilized in set point (Vt), obviously, and Vo＜Vin.Inductance L 1 and capacitor C 1 are formed filter circuit among Fig. 2, and resistance R is a load resistance, and inductance L 1 also can be omitted.
As shown in Figure 3, in this routine circuit, positive-negative-positive bipolar transistor Q1 is first switch, and bipolar npn transistor npn npn Q2 is a second switch, and other structures of this routine circuit are identical with embodiment 1, and its operation principle can no longer repeat referring to foregoing description herein.
Embodiment 3
This routine circuit input voltage is negative voltage-Vin, and input voltage is high-end to be the common port (earth terminal G) of input voltage and output voltage, and circuit structure as shown in Figure 4.In this example, it is in contrast with the previous embodiment to be used for input voltage polarity, and the first switch Q1 adopts the N slot field-effect transistor among Fig. 4, and second switch Q2 adopts the P-channel field-effect transistor (PEFT) transistor.N slot field-effect transistor Q1 source electrode connects input voltage-Vin low side, drain electrode connects P-channel field-effect transistor (PEFT) transistor Q2 source electrode and as the voltage output end Vo of this routine circuit, the P-channel field-effect transistor (PEFT) transistor drain meets input voltage-Vin high-end (earth terminal G), and these other annexations of routine circuit are referring to embodiment 1.
The operation principle of this routine circuit is: when output end voltage Vo is higher than reference voltage V t (| Vo|＜| Vt|, wherein | Vo|, | Vt| represents the absolute value of Vo and Vt respectively, down together), voltage comparator U1 exports high level, the first switch Q1 conducting, second switch Q2 turn-offs, and output voltage V o is dragged down (promptly | Vo| increase); When output end voltage Vo is lower than reference voltage V t (| Vo|＞| Vt|), voltage comparator U1 output low level, second switch Q2 conducting, the first switch Q1 turn-offs, and output voltage V o is elevated (promptly | Vo| reduces).
The foregoing description can not limit circuit structure of the present utility model, first switch and second switch, except can adopting above-mentioned P-channel field-effect transistor (PEFT) transistor, N slot field-effect transistor, PNP bipolar transistor and NPN bipolar transistor, also can adopt the field-effect transistor of other types, as lateral double diffusion metal oxide semiconductor field-effect transistor (LDMOSFET) etc., and the insulated gate bipolar transistor (IGBT) of high pressure resistant, big electric current etc.The foregoing description more should not be construed as qualification of the present utility model, and those skilled in the art are according to description of the present utility model, and the routine of being done is replaced and all belonged to protection range of the present utility model.
Claims (10)
1. the switching mode D.C. regulated power supply comprises first switch, second switch and voltage comparator, and described first switch and second switch are connected on the input voltage two ends, and the tie point of described first switch and second switch is an output; One of two input of described voltage comparator connect reference voltage, and one connects output, and described voltage comparator output is connected with the control end of described first switch and second switch; When output end voltage was higher or lower than reference voltage, described voltage comparator can be exported two states, the turn-on and turn-off of respectively corresponding described first switch and second switch; During described first switch conduction, described second switch turn-offs, and during described second switch conducting, described first switch turn-offs.
2. switching mode D.C. regulated power supply according to claim 1 is characterized in that, described reference voltage is obtained by first resistance that is connected on the input voltage two ends and second electric resistance partial pressure.
3. switching mode D.C. regulated power supply according to claim 1 and 2 is characterized in that, it is high-end that described first switch connects input voltage, and described second switch connects the input voltage low side; When output end voltage is higher than reference voltage, described second switch conducting; When output end voltage is lower than reference voltage, described first switch conduction; Described input voltage low side is the common port of input voltage and output voltage.
4. switching mode D.C. regulated power supply according to claim 3 is characterized in that, described first switch and second switch are transistor.
5. switching mode D.C. regulated power supply according to claim 4 is characterized in that, described transistor is a field-effect transistor, and described control end is the grid of field-effect transistor; Perhaps, described transistor is a bipolar transistor, and described control end is the base stage of bipolar transistor; Perhaps, described transistor is an insulated gate bipolar transistor, and described control end is the grid of insulated gate bipolar transistor.
6. switching mode D.C. regulated power supply according to claim 5 is characterized in that, described first switch is the P-channel field-effect transistor (PEFT) transistor, and described second switch is the N slot field-effect transistor; It is high-end that described P-channel field-effect transistor (PEFT) transistor drain connects input voltage, and source electrode connects N slot field-effect transistor drain electrode and as output; Described N slot field-effect transistor source electrode connects the input voltage low side.
7. switching mode D.C. regulated power supply according to claim 1 and 2 is characterized in that, described first switch connects the input voltage low side, and it is high-end that described second switch connects input voltage; When output end voltage is higher than reference voltage, described voltage comparator output high level, described first switch conduction; When output end voltage is lower than reference voltage, described voltage comparator output low level, described second switch conducting; Described input voltage is high-end to be the common port of input voltage and output voltage.
8. switching mode D.C. regulated power supply according to claim 7 is characterized in that, described first switch and second switch are transistor.
9. switching mode D.C. regulated power supply according to claim 8 is characterized in that, described transistor is a field-effect transistor, and described control end is the grid of field-effect transistor; Perhaps, described transistor is a bipolar transistor, and described control end is the base stage of bipolar transistor; Perhaps, described transistor is an insulated gate bipolar transistor, and described control end is the grid of insulated gate bipolar transistor.
10. switching mode D.C. regulated power supply according to claim 9 is characterized in that, described first switch is the N slot field-effect transistor, and described second switch is the P-channel field-effect transistor (PEFT) transistor; Described N slot field-effect transistor source electrode connects the input voltage low side, and drain electrode connects the P-channel field-effect transistor (PEFT) transistor source and as output; It is high-end that described P-channel field-effect transistor (PEFT) transistor drain connects input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202006396U CN202085072U (en) | 2011-06-15 | 2011-06-15 | Switch-type DC (direct current) stabilized power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202006396U CN202085072U (en) | 2011-06-15 | 2011-06-15 | Switch-type DC (direct current) stabilized power supply |
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| CN202085072U true CN202085072U (en) | 2011-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202006396U Expired - Lifetime CN202085072U (en) | 2011-06-15 | 2011-06-15 | Switch-type DC (direct current) stabilized power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107908217A (en) * | 2017-11-15 | 2018-04-13 | 绵阳双甘科技有限公司 | A kind of game machine of use power supply for ending protection |
| CN107968585A (en) * | 2017-11-15 | 2018-04-27 | 绵阳双甘科技有限公司 | A kind of pressure-resistant game machine of use power supply of high isolation |
| CN107979296A (en) * | 2017-11-15 | 2018-05-01 | 绵阳双甘科技有限公司 | A kind of gift electromechanical source |
| WO2022047795A1 (en) * | 2020-09-07 | 2022-03-10 | 深圳市汇顶科技股份有限公司 | Buck switching power supply, electronic device, and control method |
-
2011
- 2011-06-15 CN CN2011202006396U patent/CN202085072U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107908217A (en) * | 2017-11-15 | 2018-04-13 | 绵阳双甘科技有限公司 | A kind of game machine of use power supply for ending protection |
| CN107968585A (en) * | 2017-11-15 | 2018-04-27 | 绵阳双甘科技有限公司 | A kind of pressure-resistant game machine of use power supply of high isolation |
| CN107979296A (en) * | 2017-11-15 | 2018-05-01 | 绵阳双甘科技有限公司 | A kind of gift electromechanical source |
| WO2022047795A1 (en) * | 2020-09-07 | 2022-03-10 | 深圳市汇顶科技股份有限公司 | Buck switching power supply, electronic device, and control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111221 |