CN202713178U - Voltage adjustable rectification circuit - Google Patents
Voltage adjustable rectification circuit Download PDFInfo
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- CN202713178U CN202713178U CN 201220417160 CN201220417160U CN202713178U CN 202713178 U CN202713178 U CN 202713178U CN 201220417160 CN201220417160 CN 201220417160 CN 201220417160 U CN201220417160 U CN 201220417160U CN 202713178 U CN202713178 U CN 202713178U
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- potentiometer
- voltage
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- current circuit
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Abstract
The utility model discloses a voltage adjustable rectification circuit, which comprises a bridge type rectification circuit. The voltage adjustable rectification circuit is characterized in that the input end of the bridge type rectification circuit is connected with a power frequency ac power supply, the output end of the same is connected to two fixing ends of a potentiometer, a sliding end of the potentiometer is connected with one input end of a comparator, the other input end of the comparator is connected with a reference voltage source, the output end of the comparator drives a switch tube, one fixing end of the potentiometer is connected with the switch tube and then used as one output end of the voltage adjustable rectification circuit, the other fixing end of the potentiometer is used as the other output end of the voltage adjustable rectification circuit, and a filtering capacitor is connected between the two output ends of the voltage adjustable rectification circuit. The voltage adjustable rectification circuit has the advantages that the circuit structure is simple, the cost is low, output voltage after rectification can be adjusted by sliding the potentiometer, and higher voltage converting efficiency is provided.
Description
Technical field
The utility model relates to Analog Electronics Technique, specifically, is the adjustable rectification circuit of a kind of voltage.
Background technology
In electronic technology Application and Development process, the situation of a certain DC-voltage supply often needing to appear, particularly use Alternating Current Power Supply for some, the Industrial Frequency Transformer step-down, system complex and need the situation of the different direct current supply voltage of multichannel, two kinds of selections are generally arranged: the one, adopt switching power supply, the 2nd, adopt linear stabilized power supply.
The defective of above-mentioned power supply is: the Type of Switch Stabilivolt Source Circuit load, and cost is high; Linear stabilized power supply efficient is low, and input voltage range is narrow.
The utility model content
The purpose of this utility model provides the rectification circuit that a kind of circuit is simple, with low cost, output voltage is adjustable, and power is little, required precision is low to be applicable to, but the situation that voltage range is certain, power-efficient is higher.
For achieving the above object, the scheme that the utility model adopts is as follows:
The rectification circuit that a kind of voltage is adjustable, comprise bridge rectifier, its key is: the input of described bridge rectifier connects power frequency AC, the output of bridge rectifier is connected on two stiff ends of potentiometer, the sliding end of potentiometer is connected with an input of comparator, another input of comparator connects reference voltage source, the output driving switch pipe of comparator, a stiff end of potentiometer is connected in series behind the described switching tube output as voltage capable of regulating current circuit, another stiff end of potentiometer also is connected with filter capacitor as another output of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
As further describing, the sliding end of potentiometer is connected with the inverting input of comparator, the forward phase input of comparator connects reference voltage source, the output driving N MOS type switching tube of comparator, the negative pole stiff end of potentiometer is connected in series behind the described nmos type switching tube cathode output end as voltage capable of regulating current circuit, the anodal stiff end of potentiometer also is connected with filter capacitor as the cathode output end of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
As another kind of Equivalent conjunction relation, the sliding end of potentiometer is connected with the normal phase input end of comparator, the reverse phase input of comparator connects reference voltage source, the output of comparator drives the pmos type switching tube, the anodal stiff end of potentiometer is connected in series behind the described pmos type switching tube cathode output end as voltage capable of regulating current circuit, the negative pole stiff end of potentiometer also is connected with filter capacitor as the cathode output end of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
Remarkable result of the present utility model is: circuit structure is simple, and is with low cost, and the output voltage after the rectification can be regulated by slide potentiometer, and has higher voltage transitions efficient.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model the first embodiment;
Fig. 2 is the circuit theory diagrams of the utility model the second embodiment;
Fig. 3 is the utility model operation principle key diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Specific embodiment 1:
As shown in Figure 1, the rectification circuit that a kind of voltage is adjustable, comprise bridge rectifier, the input of described bridge rectifier connects power frequency AC, the output of bridge rectifier is connected on two stiff ends of potentiometer, the sliding end of potentiometer is connected with the inverting input of comparator, the forward phase input of comparator connects reference voltage source, the output driving N MOS type switching tube of comparator, the negative pole stiff end of potentiometer is connected in series behind the described nmos type switching tube cathode output end as voltage capable of regulating current circuit, the anodal stiff end of potentiometer also is connected with filter capacitor as the cathode output end of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
The present embodiment adopts anodal altogether connected mode, be that the anodal stiff end of potentiometer is directly as the cathode output end of voltage capable of regulating current circuit, adopt the cathode output end of nmos type switch controlled voltage capable of regulating current circuit, the voltage of bridge rectifier being exported by the sliding end of potentiometer carries out voltage division processing, partial pressure value and the reference voltage VREF of potentiometer are compared, as can be seen from Figure 1, when a point voltage is lower than the b point voltage, comparator output high level, the conducting of driving N MOS type switching tube, two outputs of voltage capable of regulating current circuit directly with the bridge rectifier connection, outwards provide power supply output through the filtering capacitor C, when a point voltage is higher than the b point voltage, the comparator output low level, the nmos type switching tube disconnects, and filter capacitor C discharges to output.
Specific embodiment 2:
As shown in Figure 2, the sliding end of potentiometer is connected with the normal phase input end of comparator, the reverse phase input of comparator connects reference voltage source, the output of comparator drives the pmos type switching tube, the anodal stiff end of potentiometer is connected in series behind the described pmos type switching tube cathode output end as voltage capable of regulating current circuit, the negative pole stiff end of potentiometer also is connected with filter capacitor as the cathode output end of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
Embodiment 2 is to adopt common negative pole annexation with the difference of embodiment 1, and namely the negative pole stiff end of potentiometer is directly as the cathode output end of voltage capable of regulating current circuit.The operation principle of the two is roughly the same, and the below carries out labor to specific embodiment 2.
Two of potentiometer W stiff ends are connected on the output of bridge rectifier among Fig. 2, take out the partial pressure value of rectifier output voltage by sliding end, and be sent to the normal phase input end of comparator U, itself and reference voltage VREF are compared, when a point voltage is lower than the b point voltage, the comparator output low level, pmos type switching tube conducting this moment, otherwise the pmos type switching tube disconnects, and capacitor C is filter capacitor.
As shown in Figure 3, Fig. 3 A is the sinusoidal ac of industrial frequency AC input, obtain the pulsating dc voltage shown in Fig. 3 B through behind the bridge rectifier at the two ends of potentiometer W, if when the sliding end of potentiometer W is set to a certain position, can calculate a magnitude of voltage V1 according to reference voltage VREF, in other words, when magnitude of voltage V1 is loaded into the two ends of potentiometer W, can be so that the voltage that a is ordered equals the reference voltage that b is ordered after the process potentiometer dividing potential drop.Like this, when the pulsating dc voltage among Fig. 3 B is lower than V1, can make a point voltage be lower than the b point voltage, comparator U output low level, the conducting of pmos type switching tube; When the pulsating dc voltage among Fig. 3 B is higher than V1, can make a point voltage be higher than the b point voltage, comparator U exports high level, the pmos type switching tube disconnects, if output does not arrange filter capacitor C, then can form the output waveform shown in Fig. 3 C, namely when bridge rectifier output is higher than V1, the pmos type switching tube turn-offs, and output end voltage is 0V, if output is connected to capacitor C, then output can form the waveform of Fig. 3 D, the capacitor C value is larger, and ripple is less, adjusts the value that potentiometer W can change V1, thereby adjustment output voltage, the pmos type switching tube is operated on off state among the figure, and power consumption is very little, so circuit has higher voltage transitions efficient.
Claims (3)
1. rectification circuit that voltage is adjustable, comprise bridge rectifier, it is characterized in that: the input of described bridge rectifier connects power frequency AC, the output of bridge rectifier is connected on two stiff ends of potentiometer, the sliding end of potentiometer is connected with an input of comparator, another input of comparator connects reference voltage source, the output driving switch pipe of comparator, a stiff end of potentiometer is connected in series behind the described switching tube output as voltage capable of regulating current circuit, another stiff end of potentiometer also is connected with filter capacitor as another output of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
2. the adjustable rectification circuit of a kind of voltage according to claim 1, it is characterized in that: the sliding end of potentiometer is connected with the inverting input of comparator, the forward phase input of comparator connects reference voltage source, the output driving N MOS type switching tube of comparator, the negative pole stiff end of potentiometer is connected in series behind the described nmos type switching tube cathode output end as voltage capable of regulating current circuit, the anodal stiff end of potentiometer also is connected with filter capacitor as the cathode output end of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
3. the adjustable rectification circuit of a kind of voltage according to claim 1, it is characterized in that: the sliding end of potentiometer is connected with the normal phase input end of comparator, the reverse phase input of comparator connects reference voltage source, the output of comparator drives the pmos type switching tube, the anodal stiff end of potentiometer is connected in series behind the described pmos type switching tube cathode output end as voltage capable of regulating current circuit, the negative pole stiff end of potentiometer also is connected with filter capacitor as the cathode output end of voltage capable of regulating current circuit between two outputs of voltage capable of regulating current circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220417160 CN202713178U (en) | 2012-08-21 | 2012-08-21 | Voltage adjustable rectification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220417160 CN202713178U (en) | 2012-08-21 | 2012-08-21 | Voltage adjustable rectification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202713178U true CN202713178U (en) | 2013-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220417160 Expired - Fee Related CN202713178U (en) | 2012-08-21 | 2012-08-21 | Voltage adjustable rectification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202713178U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018234909A1 (en) * | 2017-06-18 | 2018-12-27 | Hau King Kuen | Ac-to-dc conversion |
| CN114019853A (en) * | 2021-10-27 | 2022-02-08 | 广州祥驰电气有限公司 | Guide rail type 5G switch power supply |
-
2012
- 2012-08-21 CN CN 201220417160 patent/CN202713178U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018234909A1 (en) * | 2017-06-18 | 2018-12-27 | Hau King Kuen | Ac-to-dc conversion |
| CN114019853A (en) * | 2021-10-27 | 2022-02-08 | 广州祥驰电气有限公司 | Guide rail type 5G switch power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20150821 |
|
| EXPY | Termination of patent right or utility model |