CN212367128U - Control circuit for realizing positive and negative output - Google Patents
Control circuit for realizing positive and negative output Download PDFInfo
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- CN212367128U CN212367128U CN202021117332.5U CN202021117332U CN212367128U CN 212367128 U CN212367128 U CN 212367128U CN 202021117332 U CN202021117332 U CN 202021117332U CN 212367128 U CN212367128 U CN 212367128U
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Abstract
The utility model discloses a control circuit for realizing positive and negative output, which comprises an input circuit, a PWM control chip, a feedback circuit and a rectification output circuit, wherein the input circuit comprises an electrolytic capacitor, a first resistor and a second resistor, the feedback circuit comprises an eighth resistor and a seventh capacitor, the rectification output circuit comprises a first inductor, a fifth capacitor, a sixth capacitor and a first diode, the anode of the electrolytic capacitor is connected with one end of the first capacitor, one end of the first resistor and a VIN pin of the PWM control chip respectively, the other end of the first resistor is connected with one end of a second resistor and a second pin of the PWM control chip respectively, a SW pin of the PWM control chip is connected with the cathode of the first diode and one end of the first inductor respectively, and an FB pin of the PWM control chip is connected with one end of the fifth resistor and one end of the sixth resistor respectively. The utility model relates to a with use simply reliably.
Description
Technical Field
The utility model relates to a control circuit field, in particular to realize just with control circuit of burden output.
Background
The BUCK circuit refers to a single tube which outputs less than voltage and does not isolate direct current conversion. The traditional BUCK circuit has different circuit control on positive and negative output, has larger difference in design and layout and cannot be used universally. The voltage output by the simple BUCK circuit is unstable and can be interfered by a load and the outside, and when a PID controller is added, closed-loop control is realized. The PWM modulation wave can be obtained through a sampling link and then compared with the reference voltage, the feedback signal is obtained through the PID controller and compared with the triangular wave to obtain the modulated switching waveform which is used as a switching signal, and therefore the closed-loop PID control system of the BUCK circuit is achieved.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide a design and use simple reliable realization just with the control circuit of burden output.
The utility model provides a technical scheme that its technical problem adopted is: the control circuit for realizing positive and negative output comprises an input circuit, a PWM (pulse-width modulation) control chip, a feedback circuit and a rectification output circuit, wherein the input circuit comprises an electrolytic capacitor, a first resistor and a second resistor, the feedback circuit comprises an eighth resistor, a seventh capacitor, a sixth resistor, a fifth resistor and a potentiometer, the rectification output circuit comprises a first inductor, a fifth capacitor, a sixth capacitor and a first diode, the anode of the electrolytic capacitor is respectively connected with one end of the first capacitor, one end of the first resistor and the VIN (VIN) pin of the PWM control chip, the other end of the first resistor is respectively connected with one end of the second resistor and the second pin of the PWM control chip, the pin SW of the PWM control chip is respectively connected with the cathode of the first diode and one end of the first inductor, and the FB pin of the PWM control chip is respectively connected with one end of the fifth resistor, the feedback circuit and the rectification output circuit, One end of a sixth resistor, one end of a seventh capacitor and one end of an eighth resistor are connected, the other end of the fifth resistor is connected with a fixed end of the potentiometer respectively, the other end of the first inductor is connected with the other end of the seventh capacitor, the other end of the eighth resistor, the anode of the fifth capacitor and the anode of the sixth capacitor respectively, and the cathode of the electrolytic capacitor is connected with the other end of the first capacitor, the other end of the second resistor, the other fixed end and the sliding end of the potentiometer, the other end of the sixth resistor, the anode of the first diode, the cathode of the fifth capacitor and the cathode of the sixth capacitor respectively.
Realize in the control circuit just with burden output, positive input ground point is connected to the one end of first electric capacity, burden input ground point is connected to the other end of first electric capacity, the positive connection +12V power of sixth electric capacity.
In the control circuit for realizing positive and negative outputs of the present invention, the positive input ground point is connected to one end of the first capacitor, the negative input ground point is connected to the positive electrode of the sixth capacitor, and the-12V power supply is connected to the negative electrode of the sixth capacitor.
The control circuit who just exports with the burden in the realization in, still include the third resistance, the one end of third resistance with PWM control chip's FREQ pin is connected, the other end of third resistance with the other end of second resistance is connected.
The control circuit who just exports with the burden is realized in, still include fourth resistance and second electric capacity, the one end of second electric capacity with PWM control chip's COM pin is connected, the other end of second electric capacity with the one end of fourth resistance is connected, the other end of fourth resistance respectively with PWM control chip's GND pin and the other end of third resistance are connected.
The control circuit who just exports with the burden in the realization in, still include the third electric capacity, the one end of third electric capacity with PWM control chip's BST pin is connected, the other end of third electric capacity respectively with PWM control chip's SW pin, the one end of first inductance and the negative pole of first diode are connected.
The control circuit who just exports with the burden in the realization in, still include fourth electric capacity and seventh resistance, the one end of fourth electric capacity with the negative pole of first diode is connected, the other end of sixth resistance with the one end of seventh resistance is connected, the other end of seventh resistance with the other end of sixth resistance is connected.
In the control circuit for realizing positive and negative outputs of the present invention, the model of the PWM control chip is MP 4560.
In the control circuit for realizing positive and negative outputs of the present invention, the potentiometer is 3362P 102.
Implement the utility model discloses a realize just with the control circuit of burden output, have following beneficial effect: owing to be equipped with input circuit, PWM control chip, feedback circuit and rectification output circuit, input circuit includes electrolytic capacitor, first electric capacity, first resistance and second resistance, feedback circuit includes eighth resistance, seventh electric capacity, sixth resistance, fifth resistance and potentiometre, rectification output circuit includes first inductance, fifth electric capacity, sixth electric capacity and first diode, this circuit is by the circuit of PWM control chip control, realize the input just to the function of output burden, same simple control circuit, only simple modification input ground point, can reach the purpose of output plus or minus, the utility model relates to a with use simple and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of a control circuit for realizing positive and negative outputs according to the present invention, wherein the output is positive;
fig. 2 is a schematic circuit diagram of the control circuit for realizing the positive and negative outputs in the embodiment, wherein the output of the control circuit is negative.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses realize the control circuit embodiment of positive and negative output, this control circuit output that realizes positive and negative output is positive circuit schematic diagram as shown in figure 1, and the output is negative circuit schematic diagram as shown in figure 2. As shown in fig. 1 and fig. 2, the electrolytic capacitor E1, the first capacitor C1, the first resistor R1 and the second resistor R2 constitute an input circuit, the eighth resistor R8, the seventh capacitor C7, the sixth resistor R6, the fifth resistor R5 and the potentiometer W1 constitute a feedback circuit for voltage stabilization output control, the first inductor L1, the fifth capacitor C5, the sixth capacitor C6 and the first diode D1 constitute a rectification output circuit, it can be seen that the control circuit for implementing positive and negative output includes an input circuit, a PWM control chip IC1, a feedback circuit and a rectification output circuit, the input circuit turns on the EN pin of the PWM control chip IC1, the PWM control chip IC1 adopts a switch output, wherein the positive electrode of the electrolytic capacitor E1 is connected to one end of the first capacitor C1, one end of the first resistor R1 and the VIN pin of the PWM control chip IC1, the other end of the first resistor R1 is connected to the first terminal of the second resistor R2 and the second terminal of the PWM control chip VIN 1, an SW pin of the PWM control chip IC1 is connected to a cathode of the first diode D1 and one end of the first inductor L1, an FB pin of the PWM control chip IC1 is connected to one end of the fifth resistor R5, one end of the sixth resistor R6, one end of the seventh capacitor C7, and one end of the eighth resistor R8, the other end of the fifth resistor R5 is connected to one fixed end of the potentiometer W1, the other end of the first inductor L1 is connected to the other end of the seventh capacitor C7, the other end of the eighth resistor R8, an anode of the fifth capacitor C5, and a cathode of the sixth capacitor C6, and a cathode of the electrolytic capacitor E1 is connected to the other end of the first capacitor C1, the other end of the second resistor R2, the other fixed end and a sliding end of the potentiometer W1, the other end of the sixth resistor R6, an anode of the first diode D1, a cathode of the fifth capacitor C5, and a cathode of the sixth capacitor C6. The utility model discloses realize the design and the overall arrangement of same circuit, through simple modification input ground point, can reach the purpose of output plus or minus, the design is simple reliable with using.
In this embodiment, when the output is positive, one end of the first capacitor C1 is connected to the positive input ground + VIN, the other end of the first capacitor C1 is connected to the negative input ground-VIN, and the positive electrode of the sixth capacitor C6 is connected to the +12V power supply. The positive principle of output is as follows: positive input grounding point + VIN input, the PWM control chip IC1 is switched on, the output is output to the first inductor L1, then positive +12V is output, and the positive input grounding point-VIN is input to the negative input grounding point through the fifth capacitor C5\ the sixth capacitor C6; the PWM control chip IC1 turns off, the first inductor L1 is left negative and right positive, freewheels through the first diode D1, and still outputs + 12V.
When the output is negative, one end of the first capacitor C1 is connected to the positive input ground + VIN, the positive terminal of the sixth capacitor C6 is connected to the negative input ground-VIN, and the negative terminal of the sixth capacitor C6 is connected to the-12V power supply. The principle of outputting negative is as follows: the positive input grounding point + VIN input, the PWM control chip IC1 is switched on, the output is connected to the negative input grounding point-VIN, and the voltage is between-12V through a fifth capacitor C5\ a sixth capacitor C6; the PWM control chip IC1 is turned off, the first inductor L1 is left negative and right positive, and the PWM control chip IC1 freewheels through the first diode D1 and outputs 12V.
In the present embodiment, the output is merely illustrated as +12V and-12V, and the control circuit for realizing positive and negative outputs is also applicable to other output voltage values.
It should be noted that in the present embodiment, the model of the PWM control chip IC1 is MP 4560. Of course, in practical applications, the PWM controller IC1 may also be other PWM controllers with the same function.
In this embodiment, the potentiometer W1 is model 3362P 102. Of course, in practical application, the potentiometer W1 may be other types of potentiometers with the same function.
In this embodiment, the control circuit for realizing positive and negative outputs further includes a third resistor R3, one end of the third resistor R3 is connected to the FREQ pin of the PWM control chip IC1, and the other end of the third resistor R3 is connected to the other end of the second resistor R2. In this embodiment, the resistance of the third resistor R3 is 390K Ω, and the model is 0805.
In this embodiment, the control circuit for realizing positive and negative outputs further includes a fourth resistor R4 and a second capacitor C2, one end of the second capacitor C2 is connected to the COM pin of the PWM control chip IC1, the other end of the second capacitor C2 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the GND pin of the PWM control chip IC1 and the other end of the third resistor R3, respectively. In this embodiment, the fourth resistor R4 has a resistance of 150K Ω and a model number of 0805. The second capacitor C2 has a capacitance of 220pF and a model number of 0805.
In this embodiment, the control circuit for implementing positive and negative outputs further includes a third capacitor C3, one end of the third capacitor C3 is connected to the BST pin of the PWM control chip IC1, and the other end of the third capacitor C3 is connected to the SW pin of the PWM control chip IC1, one end of the first inductor L1, and the cathode of the first diode D1, respectively. In this embodiment, the capacitance value of the third capacitor C3 is 104pF, and the model is 0805.
In this embodiment, the control circuit for realizing positive and negative outputs further includes a fourth capacitor C4 and a seventh resistor R7, one end of the fourth capacitor C4 is connected to the cathode of the first diode D1, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the other end of the sixth resistor R6. In this embodiment, the fourth capacitor C4 has a capacitance of 471pF and a model number of 0805. The seventh resistor R7 has a resistance of 22 Ω and a model number of 1206.
In a word, the utility model relates to a simply can realize just with the buck circuit of burden output, same circuit and overall arrangement, only simple modification input ground point can reach the purpose of output plus or minus, the design is simple reliable with the application. The same simple control circuit can achieve the purpose of outputting positive or negative only by simply modifying the input grounding point (+ VIN/-VIN). The utility model relates to a with use simply reliably.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The control circuit is characterized by comprising an input circuit, a PWM (pulse-width modulation) control chip, a feedback circuit and a rectification output circuit, wherein the input circuit comprises an electrolytic capacitor, a first resistor and a second resistor, the feedback circuit comprises an eighth resistor, a seventh capacitor, a sixth resistor, a fifth resistor and a potentiometer, the rectification output circuit comprises a first inductor, a fifth capacitor, a sixth capacitor and a first diode, the anode of the electrolytic capacitor is respectively connected with one end of the first capacitor, one end of the first resistor and the VIN (VIN) pin of the PWM control chip, the other end of the first resistor is respectively connected with one end of the second resistor and the second pin of the PWM control chip, the SW pin of the PWM control chip is respectively connected with the cathode of the first diode and one end of the first inductor, and the FB pin of the PWM control chip is respectively connected with one end of the fifth resistor, the FB pin of the feedback circuit and the rectification output circuit, One end of a sixth resistor, one end of a seventh capacitor and one end of an eighth resistor are connected, the other end of the fifth resistor is connected with a fixed end of the potentiometer respectively, the other end of the first inductor is connected with the other end of the seventh capacitor, the other end of the eighth resistor, the anode of the fifth capacitor and the anode of the sixth capacitor respectively, and the cathode of the electrolytic capacitor is connected with the other end of the first capacitor, the other end of the second resistor, the other fixed end and the sliding end of the potentiometer, the other end of the sixth resistor, the anode of the first diode, the cathode of the fifth capacitor and the cathode of the sixth capacitor respectively.
2. The control circuit of claim 1, wherein one end of the first capacitor is connected to a positive input ground point, the other end of the first capacitor is connected to a negative input ground point, and the positive electrode of the sixth capacitor is connected to a +12V power supply.
3. The control circuit for realizing positive and negative outputs according to claim 1, wherein one end of the first capacitor is connected to a positive input ground point, the positive electrode of the sixth capacitor is connected to a negative input ground point, and the negative electrode of the sixth capacitor is connected to a-12V power supply.
4. The control circuit according to claim 3, further comprising a third resistor, wherein one end of the third resistor is connected to the FREQ pin of the PWM control chip, and the other end of the third resistor is connected to the other end of the second resistor.
5. The control circuit for realizing positive and negative outputs according to claim 4, further comprising a fourth resistor and a second capacitor, wherein one end of the second capacitor is connected to the COM pin of the PWM control chip, the other end of the second capacitor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the GND pin of the PWM control chip and the other end of the third resistor respectively.
6. The control circuit for realizing positive and negative outputs according to claim 5, further comprising a third capacitor, wherein one end of the third capacitor is connected to the BST pin of the PWM control chip, and the other end of the third capacitor is connected to the SW pin of the PWM control chip, one end of the first inductor, and the cathode of the first diode, respectively.
7. The control circuit according to claim 6, further comprising a fourth capacitor and a seventh resistor, wherein one end of the fourth capacitor is connected to the cathode of the first diode, the other end of the sixth resistor is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the other end of the sixth resistor.
8. The control circuit for realizing positive and negative outputs according to any one of claims 1 to 7, wherein the model of the PWM control chip is MP 4560.
9. The control circuit for realizing positive and negative outputs according to any of claims 1 to 7, wherein the potentiometer has a model number of 3362P 102.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021117332.5U CN212367128U (en) | 2020-06-17 | 2020-06-17 | Control circuit for realizing positive and negative output |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021117332.5U CN212367128U (en) | 2020-06-17 | 2020-06-17 | Control circuit for realizing positive and negative output |
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| CN212367128U true CN212367128U (en) | 2021-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600480A (en) * | 2020-06-17 | 2020-08-28 | 深圳市东圣源达科技有限公司 | Control circuit for realizing positive and negative output |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600480A (en) * | 2020-06-17 | 2020-08-28 | 深圳市东圣源达科技有限公司 | Control circuit for realizing positive and negative output |
| CN111600480B (en) * | 2020-06-17 | 2024-08-30 | 深圳市东圣源达科技有限公司 | Control circuit for realizing positive and negative output |
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