CN211481152U - Novel intelligent physical examination owner accuse power module developments voltage adjustment circuit - Google Patents
Novel intelligent physical examination owner accuse power module developments voltage adjustment circuit Download PDFInfo
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- CN211481152U CN211481152U CN202020407435.9U CN202020407435U CN211481152U CN 211481152 U CN211481152 U CN 211481152U CN 202020407435 U CN202020407435 U CN 202020407435U CN 211481152 U CN211481152 U CN 211481152U
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Abstract
The utility model provides a new intelligent physical examination owner accuse power module developments voltage adjustment circuit, include: a power supply circuit and an adjustment circuit; the adjusting circuit comprises a PWM signal generating circuit, an RC filter circuit and a resistor R2; the PWM signal generating circuit is connected with the RC filter circuit; the RC filter circuit is connected to the connection position of the resistor R3 and the resistor R4 through the resistor R2. The utility model discloses a new intelligent physical examination owner accuse power module dynamic voltage adjustment circuit, through the state of PWM signal generating circuit adjustment DCDC chip's Feedback (FB) pin to realize the dynamic adjustment of the output voltage of DCDC chip, because it is not the mode of the switch of the control DCDC chip in adopting the background art, so voltage output is stable; compared with the method for controlling the resistance value of the feedback resistor in the background technology, the method is lower in cost.
Description
Technical Field
The utility model relates to an adjusting circuit technical field, in particular to novel intelligent physical examination owner accuse power module developments voltage adjustment circuit.
Background
At present, the scheme for implementing real-time dynamic voltage adjustment of a main control chip in the aspect of a direct current voltage conversion power supply chip (DCDC chip) is mainly implemented by two ways:
firstly, controlling a switch of a DCDC chip to realize a voltage reduction design.
And secondly, controlling the resistance value of the feedback resistor to realize voltage regulation.
The voltage reduction purpose is achieved by controlling the switch of the DCDC chip, and the problem of the scheme is that the DCDC chip has a starting time, and the voltage can be kept constant only by an output capacitor in the starting time, which means that the output has a voltage drop peak certainly, namely the voltage output is unstable.
The voltage can be increased or decreased by controlling the resistance value of the feedback resistor, but the adjustment precision is low, so that the method is not suitable for a main chip with high precision requirement; there are also high precision resistive encoders, but such devices tend to be very expensive.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel intelligent physical examination owner accuse power module developments voltage adjustment circuit, through the state of PWM signal generating circuit adjustment DCDC chip's Feedback (FB) pin to realize the dynamic adjustment of the output voltage of DCDC chip, because it is not the mode of the switch of the control DCDC chip in the background art, so voltage output is stable; compared with the method for controlling the resistance value of the feedback resistor in the background technology, the method is lower in cost.
The utility model provides a new intelligent physical examination owner accuse power module developments voltage adjustment circuit, include: a power supply circuit and an adjustment circuit;
the power supply circuit includes: the circuit comprises an input end, an output end, a DCDC chip, an inductor L1, a resistor R3, a resistor R4, a resistor R5, a capacitor C2 and a capacitor C3; the IN pin of the DCDC chip is connected with the input end; one end of the capacitor C2 is connected with an IN pin of the DCDC chip, and the other end is grounded; an AGND pin and a PGND pin of the DCDC chip are grounded after being short-circuited; the FB pin of the DCDC chip is grounded after being sequentially connected with a resistor R3 and a resistor R4; the OUT pin of the DCDC chip is connected with the output end; the SW pin of the DCDC chip is connected with the output end through an inductor L1; the output end is grounded through a capacitor C3; the output end is grounded through a resistor R5 and a resistor R4;
the adjusting circuit comprises a PWM signal generating circuit, an RC filter circuit and a resistor R2;
the PWM signal generating circuit is connected with the RC filter circuit; the RC filter circuit is connected to the connection position of the resistor R3 and the resistor R4 through the resistor R2.
Preferably, the RC filter circuit comprises a resistor R1 and a capacitor C1; one end of the resistor R1 is connected with the PWM signal generating circuit, and the other end is connected with the resistor R2; c2 has one end connected to the connection position of the resistor R2 and the resistor R1 and the other end connected to ground.
Preferably, the PWM signal generating circuit includes a PWM generator circuit; the PWM generator circuit outputs a PWM signal.
Preferably, the DCDC chip includes: MC34063A chip.
Preferably, the PWM signal generation circuit further includes: the voltage detection circuit is connected with the output end and is used for detecting the voltage of the output end;
and the PWM control circuit is connected with the voltage detection circuit at one end and connected with the PWM generator circuit at the other end and used for controlling the duty ratio of the PWM signal output by the PWM signal generation circuit according to the voltage at the output end.
Preferably, the PWM control circuit includes: STC89C52 singlechip.
Preferably, the RC filter circuit 12 includes a cascaded RC filter circuit.
Preferably, the PWM signal generating circuit 11 is a controller of the smart experience machine.
The utility model discloses can gain following beneficial effect:
one, compare with the first implementation in the background art, the utility model discloses can realize step-up, step-down voltage regulation to there is not the uncertain state of output voltage that the switch DCDC chip caused.
Compared with the second implementation mode in the background art, the circuit cost is greatly reduced under the condition that the same high precision can be achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is the embodiment of the utility model provides an in the embodiment a new intelligent physical examination owner control power module dynamic voltage adjustment circuit's schematic diagram.
Fig. 2 is a schematic diagram of a power circuit according to an embodiment of the present invention;
fig. 3 is a topology structure diagram inside a DCDC chip according to an embodiment of the present invention;
in the figure:
11. a PWM signal generating circuit; 12. and an RC filter circuit.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The utility model provides a new dynamic voltage adjusting circuit of the main control power module of the intelligent physical examination machine, which aims at realizing dynamic voltage adjustment of the power circuit of the main control power module of the new intelligent physical examination machine; as shown in fig. 2, the power supply circuit includes: the circuit comprises an input end, an output end, a DCDC chip, an inductor L1, a resistor R3, a resistor R4, a resistor R5, a capacitor C2 and a capacitor C3; the IN pin of the DCDC chip is connected with the input end; one end of the capacitor C2 is connected with an IN pin of the DCDC chip, and the other end is grounded; an AGND pin and a PGND pin of the DCDC chip are grounded after being short-circuited; the FB pin of the DCDC chip is grounded after being sequentially connected with a resistor R3 and a resistor R4; the OUT pin of the DCDC chip is connected with the output end; the SW pin of the DCDC chip is connected with the output end through an inductor L1; the output end is grounded through a capacitor C3; the output end is grounded through a resistor R5 and a resistor R4;
for the output voltage who adjusts above-mentioned power supply circuit, the utility model provides a new intelligent health examination owner accuse power module developments voltage adjustment circuit, including foretell power supply circuit and adjusting circuit, as shown in figure 2, adjusting circuit includes: a PWM signal generating circuit 11, an RC filter circuit 12, and a resistor R2;
the PWM signal generating circuit 11 is connected with the RC filter circuit 12; the RC filter circuit 12 is connected to the connection position of the resistor R3 and the resistor R4 through a resistor R2.
The working principle and the beneficial effects of the technical scheme are as follows:
the working principle of the DCDC chip is to convert direct-current voltage into direct-current voltage, and the direct-current voltage is realized by a PWM pulse width modulation method, and the principle is as shown in fig. 1:
the DCDC chip outputs PWM square waves with a certain duty ratio at the SW pin by controlling the conduction states of two MOS tubes inside, the square waves are converted into direct-current-like voltage through an LC filter circuit of an inductor L1 and a capacitor C3 to be output VO (voltage at an output end), and the voltage at the output end depends on the resistance values of resistors R5 and R4. The FB pin is a comparator inside the chip, and the voltage V1 is fixed, because the comparator is an operational amplifier and the input impedance can be considered infinite, so according to the norton equivalent principle, V1/R4 is VO/(R4+ R5), and thus fixed R4 and R4 determine the fixed output voltage. The topology structure inside the DCDC chip is shown in fig. 2, which is not a problem of the present invention, and therefore, is not described herein.
In the background art, a voltage reduction design is realized by controlling a switch of a DCDC chip, the state of an EN pin is adjusted through a PWM signal, VO is normally output when the EN pin is opened, and voltage drops gradually when the EN pin is closed, so that voltage reduction is realized through reciprocating circulation.
In the background art, voltage adjustment is realized by controlling the resistance value of a feedback resistor, the voltage adjustment is realized by adjusting the resistance value of R4 or R5, and a low-cost resistor encoder needs manual adjustment or has extremely low precision; expensive encoders can be implemented with digital programming and with sufficient accuracy, but the high price is often prohibitive for engineers.
The utility model discloses a novel intelligent physical examination owner accuse power module dynamic voltage adjustment circuit, connect PWM signal generating circuit 11 with RC filter circuit 12; then the RC filter circuit 12 is connected to the connection position of the resistor R3 and the resistor R4 of the power circuit needing to be adjusted through the resistor R2;
the PWM signal output by the PWM signal generating circuit 11 can ensure that the voltage V2 is a dc voltage through the RC filter circuit 12, if the dc voltage ripple is to be reduced, the duty ratio of the PWM signal and the output voltage of the PWM signal generating circuit 11, which are determined by the voltage value of the V2, can be considered in the multi-stage RC filter circuit 12. Since the voltage at the FB pin is V1, and since the input impedance of the op-amp is infinite, resulting in a current at the FB pin being 0, the voltage on the right side of R3 is also V1, and according to the norton equivalent principle, V2/R2+ VO/R5 is V1/R4, since V1 is a fixed voltage, which is only related to the comparator reference voltage of the DCDC chip, and R2, R4, and R5 have known fixed values, VO can be converted into a relationship with V2: VO ═ R5 × V1/R4-R5 × V2/R4; therefore, the voltage of the output end of the power circuit can be adjusted by adjusting the voltage of the V2. When the output voltage of the PWM signal generation circuit 11 is not changed, the duty ratio of the PWM signal can be adjusted.
Further, in practical application, namely, when the intelligent physical examination machine is accessed, the controller of the intelligent physical examination machine replaces the PWM signal generating circuit 11 to output the PWM signal to the RC filter circuit 12. And adjusting the voltage of the output end of the power circuit according to different duty ratios of the PWM signals output by the controller.
The utility model discloses a new intelligent physical examination owner accuse power module dynamic voltage adjustment circuit, through the state of PWM signal generating circuit 11 adjustment DCDC chip's feedback FB pin to realize the dynamic adjustment of the output voltage of DCDC chip, because it is not the mode of the switch of the control DCDC chip in adopting the background art, so voltage output is stable; compared with the method for controlling the resistance value of the feedback resistor in the background technology, the method is lower in cost.
In one embodiment, the RC filter circuit 12 includes a resistor R1 and a capacitor C1; one end of the resistor R1 is connected with the PWM signal generating circuit 11, and the other end is connected with the resistor R2; c2 has one end connected to the connection position of the resistor R2 and the resistor R1 and the other end connected to ground.
The working principle and the beneficial effects of the technical scheme are as follows:
the alternating current signal is led into the grounding end through the capacitor C1, the voltage of V2 is ensured to be direct current, and the influence of the alternating current signal on a power circuit is prevented.
To enable generation of the PWM signal, in one embodiment, the PWM signal generation circuit 11 includes a PWM generator circuit; the PWM generator circuit outputs a PWM signal.
To implement the DC-to-DC functionality of the power circuit, in one embodiment, the DCDC chip includes: MC34063A chip.
In one embodiment, the PWM signal generation circuit 11 further includes: the voltage detection circuit is connected with the output end and is used for detecting the voltage of the output end;
and a PWM control circuit, one end of which is connected to the voltage detection circuit and the other end of which is connected to the PWM generator circuit, for controlling the duty ratio of the PWM signal output from the PWM signal generation circuit 11 according to the output terminal voltage.
The working principle and the beneficial effects of the technical scheme are as follows:
the PWM control circuit detects the voltage of the output end of the power supply circuit through the voltage detection circuit, and on one hand, the output voltage of the power supply circuit after the output of the power supply circuit is adjusted by the adjusting circuit is determined; on the other hand, when the voltage of the output end of the adjusted power supply does not reach the set value, the PWM control circuit controls the PWM signal generating circuit 11 to continuously adjust the duty ratio of the PWM signal, so as to reach the preset value, realize the feedback of the adjustment result, and improve the adjustment precision of the adjustment circuit.
To implement the control function of the PWM control circuit, in one embodiment, the PWM control circuit includes: STC89C52 singlechip.
In one embodiment, RC filter circuit 12 comprises a cascaded RC filter circuit.
In one embodiment, the PWM signal generation circuit 11 is a controller of the smart experience machine. The utility model discloses a new intelligence physical examination owner accuse power module developments voltage adjustment circuit is used in the intelligence physical examination machine, and the event can directly send PWM signal control by the controller of the intelligent physical examination machine the utility model discloses an adjustment circuit's work.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The utility model provides a new intelligent physical examination owner accuse power module dynamic voltage adjustment circuit which characterized in that includes: a power supply circuit and an adjustment circuit;
the power supply circuit includes: the circuit comprises an input end, an output end, a DCDC chip, an inductor L1, a resistor R3, a resistor R4, a resistor R5, a capacitor C2 and a capacitor C3; the IN pin of the DCDC chip is connected with the input end; one end of the capacitor C2 is connected with an IN pin of the DCDC chip, and the other end of the capacitor C2 is grounded; an AGND pin and a PGND pin of the DCDC chip are grounded after being short-circuited; the FB pin of the DCDC chip is grounded after being sequentially connected with the resistor R3 and the resistor R4; the OUT pin of the DCDC chip is connected with the output end; the SW pin of the DCDC chip is connected with the output end through the inductor L1; the output end is grounded through the capacitor C3; the output end is grounded through the resistor R5 and the resistor R4;
the adjusting circuit comprises a PWM signal generating circuit (11), an RC filter circuit (12) and a resistor R2;
the PWM signal generating circuit (11) is connected with the RC filter circuit (12); the RC filter circuit (12) is connected to a connection position of the resistor R3 and the resistor R4 through the resistor R2.
2. The new smart physical examination machine master power supply module dynamic voltage adjustment circuit of claim 1, characterized in that the RC filter circuit (12) comprises a resistor R1 and a capacitor C1; one end of the resistor R1 is connected with the PWM signal generating circuit (11), and the other end of the resistor R1 is connected with the resistor R2; one end of the C2 is connected to the connection position of the resistor R2 and the resistor R1, and the other end is grounded.
3. The new dynamic voltage adjustment circuit of an intelligent physical examination machine master control power supply module according to claim 1, wherein the PWM signal generation circuit (11) comprises a PWM generator circuit; the PWM generator circuit outputs a PWM signal.
4. The new dynamic voltage adjustment circuit for a main control power module of an intelligent physical examination machine according to claim 1, wherein the DCDC chip comprises: MC34063A chip.
5. The new dynamic voltage adjustment circuit for a main control power module of an intelligent physical examination machine according to claim 3, wherein the PWM signal generation circuit (11) further comprises: the voltage detection circuit is connected with the output end and is used for detecting the voltage of the output end;
and one end of the PWM control circuit is connected with the voltage detection circuit, and the other end of the PWM control circuit is connected with the PWM generator circuit and used for controlling the duty ratio of the PWM signal output by the PWM signal generation circuit (11) according to the voltage of the output end.
6. The new dynamic voltage adjustment circuit for a master control power module of an intelligent physical examination machine according to claim 5, wherein the PWM control circuit comprises: STC89C52 singlechip.
7. The new smart physical examination machine master power supply module dynamic voltage adjustment circuit of claim 1, wherein the RC filter circuit (12) comprises a cascaded RC filter circuit.
8. The new dynamic voltage regulation circuit of a smart inspection machine master power supply module of claim 1, wherein the PWM signal generation circuit (11) is a controller of a smart inspection machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020407435.9U CN211481152U (en) | 2020-03-26 | 2020-03-26 | Novel intelligent physical examination owner accuse power module developments voltage adjustment circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020407435.9U CN211481152U (en) | 2020-03-26 | 2020-03-26 | Novel intelligent physical examination owner accuse power module developments voltage adjustment circuit |
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| CN211481152U true CN211481152U (en) | 2020-09-11 |
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| CN202020407435.9U Active CN211481152U (en) | 2020-03-26 | 2020-03-26 | Novel intelligent physical examination owner accuse power module developments voltage adjustment circuit |
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