CN217469769U - Programmable boost DCDC circuit - Google Patents
Programmable boost DCDC circuit Download PDFInfo
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- CN217469769U CN217469769U CN202221157335.0U CN202221157335U CN217469769U CN 217469769 U CN217469769 U CN 217469769U CN 202221157335 U CN202221157335 U CN 202221157335U CN 217469769 U CN217469769 U CN 217469769U
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Abstract
The utility model provides a programmable boost DCDC circuit, which comprises a processing unit, a digital-to-analog conversion unit, an input resistor, a ground resistor, a power control circuit, a power output circuit and a feedback circuit; the processing unit is electrically connected with one end of the input resistor through the digital-to-analog conversion unit; the other end of the input resistor is electrically connected with the grounding resistor, the input end of the power supply control circuit and one end of the feedback circuit; the output end of the power supply control circuit is electrically connected with the input end of the power output circuit; the output end of the power output circuit is electrically connected with the other end of the feedback circuit. The utility model discloses on the basis of power control circuit, plus program control bias voltage realizes programmable DCDC boost output circuit, realizes the linear controllable output of output voltage, reaches the effect of real-time and accurate control; meanwhile, the circuit has the advantages of simple circuit, small occupied space of the printed board, good stability and convenience in regulating output voltage.
Description
Technical Field
The utility model belongs to the technical field of power control, especially, relate to a DCDC circuit steps up able to programme.
Background
The switching power supply is generally applied to the existing power supply due to the advantages of high efficiency, small volume, low cost and the like. Unlike the old transformer power supply, the switching power supply can work at a very high switching frequency and is used for converting AC into DC, converting DC into AC, converting AC into AC and the like, so that the switching power supply has incomparable advantages compared with the old power supply, such as voltage regulation can be realized by setting chip parameters.
The existing programmable voltage-regulating switch power supply mainly has the following two implementation modes:
1. one is to adopt a chip with positive and negative inputs and outputs of an error amplifier, to provide a reference voltage for the non-inverting input end of the error amplifier, to divide the voltage of the output of a power supply and then introduce the divided voltage into the inverting input end of the error amplifier, and to add an integration loop at the output end and the inverting input end of the error amplifier, thereby realizing the programmable output of the output voltage; the implementation mode can realize voltage programmability, but the chip has more pins, complex peripheral circuits and difficult adjustment of a feedback loop, and is difficult to use on products which need low power and have strict limitation on volume and space, and meanwhile, the application under the conditions also increases the cost;
2. the other is to adopt a chip with an internal fixed reference voltage and only one feedback input end, to program the output of the switching power supply into the feedback end through a resistor, to adjust different resistor voltage division ratios, thereby realizing the programming adjustment of the output voltage; the implementation mode adopts the internal reference power supply control chip to realize voltage regulation through the regulating resistor, has the defects of inconvenient regulation, no linear characteristic and the like, and particularly has the defect that the performance of the switching power supply is seriously influenced due to the defects of poor temperature characteristic, easy deterioration and the like of the potentiometer when the potentiometer is used for regulation, so that the usable range is greatly limited.
The voltage feedback reference of many switching power supplies is solidified by an internal standard, the output of the switching power supplies is sent to a feedback input end after being subjected to voltage division by resistors, different voltage outputs are realized by adjusting different resistor proportions, or voltage regulation is realized by serially connecting a potentiometer. Although the output voltage programming control can be realized, the control is very inconvenient and has no linearity, and the real-time and accurate control is not easy to realize.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the background art, the utility model provides a DCDC circuit steps up able to programme.
In order to achieve the above purpose, the utility model provides a technical scheme does:
a programmable boost DCDC circuit comprises a processing unit, a digital-to-analog conversion unit, an input resistor, a ground resistor, a power control circuit, a power output circuit and a feedback circuit;
the processing unit is electrically connected with one end of the input resistor through the digital-to-analog conversion unit; the other end of the input resistor is electrically connected with the grounding resistor, the input end of the power supply control circuit and one end of the feedback circuit; the output end of the power supply control circuit is electrically connected with the input end of the power output circuit; and the output end of the power output circuit is electrically connected with the other end of the feedback circuit.
The utility model has the advantages that: on the basis of a power supply control circuit, a programmable control bias voltage is added to realize a programmable DCDC boost output circuit, so that the linear controllable output of the output voltage is realized, and the effect of real-time and accurate control is achieved; meanwhile, the circuit has the advantages of simple circuit, small occupied space of the printed board, good stability and convenience in regulating output voltage.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the power supply control circuit is connected with a filter circuit; the filter circuit comprises a first resistor and a first capacitor; the power supply control circuit is electrically connected with the second end of the first capacitor through the first resistor; the first end of the first capacitor is grounded.
The beneficial effect of adopting the further scheme is that the filtering of the output end signal of the error amplifier in the power supply control chip is realized through the filter circuit.
Further, the power control circuit comprises a power control chip; the power supply control chip is an LM3478 chip.
The LM3478 chip has the advantages that the switching frequency in the range of 100kHz-1MHz can be obtained only by replacing resistors with different resistance values, and the chip also has the functions of overheat turn-off, short-circuit protection and overvoltage protection, can limit overlarge starting surge current by internal soft start, and has the advantage of low power consumption.
Further, the power control circuit further comprises a second resistor; the power supply control chip is electrically connected with one end of the second resistor; and the second end of the second resistor is grounded.
Adopt above-mentioned further scheme's beneficial effect be, can adjust power control chip's switching frequency through the second resistance of replacing different resistance.
Further, the power output circuit comprises a power switch tube, a third resistor, a fourth resistor, a direct current power supply, a boost inductor and a boost diode; the output end of the power supply control circuit is electrically connected with a base electrode of the power switch tube; the first end of the fourth resistor is electrically connected with the current sampling interface of the power supply control circuit and the emitter of the power switch tube; the direct current power supply is electrically connected with the anode of the boost diode and the collector of the power switch tube through the boost inductor; the cathode of the booster diode is electrically connected with the output end of the power output circuit and one end of the feedback circuit; the other end of the feedback circuit is in electric signal connection with the feedback input end of the power supply control circuit; and the second end of the fourth resistor is grounded.
The power supply circuit has the advantages that the power supply circuit realizes voltage signal amplification output through the power switch tube, and realizes power supply of the collector of the power switch tube through the direct-current power supply and the boost inductor; the anti-backflow of current is realized through the boost diode; and current sampling is realized through the fourth resistor, and a current sampling signal is output to the power supply control circuit through the third resistor.
Further, the power output circuit further comprises a polar capacitor and a load resistor; the output end of the power output circuit is electrically connected with the anode of the polar capacitor and one end of the load resistor; and the negative electrode of the polar capacitor and the other end of the load resistor are grounded.
The beneficial effect of adopting the further scheme is that the effect of alternating current filtering is achieved by arranging the polar capacitor.
Further, the processing unit is a single chip microcomputer; the single chip microcomputer is provided with a communication interface; the single chip microcomputer is connected with an external terminal through the communication interface.
The technical scheme has the advantages that the programmable DCDC boost output circuit is realized, and meanwhile, the remote control of the power control chip is realized.
Drawings
Fig. 1 is a system diagram of a programmable boost DCDC circuit provided by the present invention;
fig. 2 is a circuit diagram of a programmable boost DCDC circuit provided by the present invention.
Icon: u1-power control chip; u2-single chip microcomputer; u3-digital to analog converter; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; c1 — first capacitance; c2-polar capacitance; q1-power switch tube; rf 1-feedback resistance; rf 2-ground resistance; rc — input resistance; RL-load resistance; l1-boost inductance; d1-boost diode; VA-the voltage at the output of the digital-to-analog converter; vf-the reference voltage at the input of the power control chip.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A programmable boost DCDC circuit is disclosed, as shown in figure 1, the circuit includes a processing unit, a digital-to-analog conversion unit, an input resistor Rc, a ground resistor Rf2, a power control circuit, a power output circuit and a feedback circuit;
the processing unit is electrically connected with one end of the input resistor Rc through the digital-to-analog conversion unit; the other end of the input resistor Rc is electrically connected with the grounding resistor Rf2, the input end of the power control circuit and one end of the feedback circuit; the output end of the power supply control circuit is electrically connected with the input end of the power output circuit; the output end of the power output circuit is electrically connected with the other end of the feedback circuit.
The utility model has the advantages that: on the basis of a power supply control circuit, a programmable control bias voltage is added to realize a programmable DCDC boost output circuit, so that the linear controllable output of the output voltage is realized, and the effect of real-time and accurate control is achieved; meanwhile, the circuit has the advantages of simple circuit, small occupied space of the printed board, good stability and convenience in regulating output voltage.
The boost DCDC circuit in the prior art only comprises a power control chip U1, the present embodiment adds a processing unit, a digital-to-analog conversion unit and an input resistor Rc, and the output end of the digital-to-analog conversion unit reaches the input end of the power control circuit through the input resistor Rc, so the output voltage of the programmable boost DCDC circuit is determined by the resistor of the feedback circuit, the ground resistor Rf2, the output end of the digital-to-analog conversion unit and the input resistor Rc; since the resistance of the feedback circuit, the ground resistance Rf2, and the input resistance Rc are fixed values, the output voltage of the circuit has a linear relationship with the output terminal voltage of the digital-to-analog conversion unit.
The power supply control chip U1 drives the switching power tube Q1, the output of the power supply control chip U1 is divided by the fourth resistor R4 and fed back to the feedback input end of the power supply control chip U1, and the digital-to-analog converter U3 controlled by the singlechip U2 outputs a programmable direct current bias voltage and simultaneously sends the programmable direct current bias voltage to the feedback input end of the power supply control chip U1. Since the input voltage signal of the power control chip U1 is direct current, no interference is introduced and the magnitude of the circuit output voltage can be changed.
Optionally, as shown in fig. 2, the power control circuit is connected to a filter circuit; the filter circuit comprises a first resistor R1 and a first capacitor C1; the power supply control circuit is electrically connected with the second end of the first capacitor C1 through a first resistor R1; a first terminal of the first capacitor C1 is connected to ground.
In the practical application process, the filtering of the output end signal of the error amplifier inside the power control chip U1 is realized through a filtering circuit.
Optionally, the power control circuit includes a power control chip U1; the power control chip U1 is an LM3478 chip.
In the practical application process, the LM3478 chip can obtain the switching frequency within the range of 100kHz-1MHz only by replacing resistors with different resistance values, and has the functions of overheat turn-off, short-circuit protection and overvoltage protection, and the internal soft start can limit the overlarge starting surge current and has the advantage of low power consumption.
Optionally, as shown in fig. 2, the power control circuit further includes a second resistor R2; the power supply control chip U1 is electrically connected with one end of the second resistor R2; the second terminal of the second resistor R2 is connected to ground.
In the practical application process, the switching frequency of the power supply control chip U1 can be adjusted through the second resistor R2, the resistance value of the second resistor R2 is set according to actual needs, and the required switching frequency is obtained by replacing the second resistor R2 with different resistance values.
Optionally, as shown in fig. 2, the power output circuit includes a power switch Q1, a third resistor R3, a fourth resistor R4, a dc power supply, a boost inductor L1, and a boost diode D1; the output end of the power supply control circuit is connected with a base electrode electric signal of the power switch tube Q1; a first end of the fourth resistor R4 is electrically connected with a current sampling interface of the power supply control circuit and an emitter of the power switch tube Q1; a direct-current power supply (the voltage of the direct-current power supply is Vc) is in electric signal connection with the anode of a boost diode D1 and the collector of a power switch tube Q1 through a boost inductor L1; the cathode of the booster diode D1 is in electric signal connection with the output end of the power output circuit and one end of the feedback circuit; the other end of the feedback circuit is in electric signal connection with the feedback input end of the power supply control circuit; the second terminal of the fourth resistor R4 is connected to ground.
In the practical application process, the voltage signal is amplified and output through the power switch tube Q1, and the power supply of the collector of the power switch tube Q1 is realized through the direct-current power supply and the boosting inductor L1; the backflow prevention of the current is realized through the boost diode D1; the current sampling is realized through the fourth resistor R4, and the current sampling signal is output to the power supply control circuit through the third resistor R3.
Optionally, as shown in fig. 2, the power output circuit further includes a polarity capacitor C2 and a load resistor RL; the output end of the power output circuit is electrically connected with the anode of the polar capacitor C2 and one end of the load resistor RL; the negative electrode of the polarity capacitor C2 and the other end of the load resistor RL are grounded.
In practical application, the polar capacitor C2 is provided to achieve the ac filtering effect.
Optionally, the processing unit is a single chip microcomputer U2; the singlechip U2 is provided with a communication interface; the singlechip U2 communicates with an external terminal through a communication interface; optionally, the single chip microcomputer U2 communicates with the PC terminal through a communication interface RS232 serial port.
In the practical application process, the programmable DCDC boost output circuit is realized, and meanwhile, the remote control of the power supply control chip U1 is realized.
Optionally, the digital-to-analog conversion unit employs a digital-to-analog converter U3. The feedback circuit includes a feedback resistor Rf 1.
The output voltage of the programmable boost DCDC circuit is jointly determined by the feedback resistor Rf1, the grounding resistor Rf2, the voltage of the output end of a digital-to-analog converter U3 and the input resistor Rc, the voltage of the output end of the digital-to-analog converter U3 is set as VA, and the reference voltage of the input end of a power supply control chip U1 is set as Vf; the output voltage Vout of the circuit and the voltage VA at the output of the digital-to-analog converter U3 have a linear relationship:
(Vout-Vf)/Rf1＝Vf/Rf2+(Vf-VA)/Rc。
the utility model discloses a singlechip U2 and digital-to-analog converter U3 increase a controllable biasing power to power control chip U1, just can easily realize output voltage's programmable function to it is little to have the circuit, printing board occupation space (singlechip U2 and digital-to-analog converter U3 integrated package are in the printing board, need not to add unnecessary equipment), the cost is lower, advantage that response speed is fast. Through tests, in a circuit powered by 24V, the voltage output from 24V to 160V or even higher can be realized, and the circuit has the advantages of high regulation precision, good linearity, fast response, high reliability and good stability.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A programmable boost DCDC circuit is characterized by comprising a processing unit, a digital-to-analog conversion unit, an input resistor, a grounding resistor, a power control circuit, a power output circuit and a feedback circuit;
the processing unit is electrically connected with one end of the input resistor through the digital-to-analog conversion unit; the other end of the input resistor is electrically connected with the grounding resistor, the input end of the power supply control circuit and one end of the feedback circuit; the output end of the power supply control circuit is electrically connected with the input end of the power output circuit; and the output end of the power output circuit is electrically connected with the other end of the feedback circuit.
2. The programmable boost DCDC circuit of claim 1, wherein said power control circuit is connected with a filter circuit; the filter circuit comprises a first resistor and a first capacitor; the power supply control circuit is electrically connected with the second end of the first capacitor through the first resistor; the first end of the first capacitor is grounded.
3. The programmable boost DCDC circuit of claim 1, wherein the power control circuit comprises a power control chip; the power supply control chip is an LM3478 chip.
4. The programmable boost DCDC circuit of claim 3, wherein said power control circuit further comprises a second resistor; the power supply control chip is electrically connected with one end of the second resistor; and the second end of the second resistor is grounded.
5. The programmable boost DCDC circuit of claim 1, wherein said power output circuit comprises a power switch tube, a third resistor, a fourth resistor, a DC power supply, a boost inductor and a boost diode; the output end of the power supply control circuit is electrically connected with a base electrode of the power switch tube; the first end of the fourth resistor is electrically connected with the current sampling interface of the power supply control circuit and the emitter of the power switch tube; the direct current power supply is electrically connected with the anode of the boost diode and the collector of the power switch tube through the boost inductor; the cathode of the booster diode is electrically connected with the output end of the power output circuit and one end of the feedback circuit; the other end of the feedback circuit is in electric signal connection with the feedback input end of the power supply control circuit; and the second end of the fourth resistor is grounded.
6. The programmable boost DCDC circuit of claim 1, wherein the power output circuit further comprises a polarity capacitor and a load resistor; the output end of the power output circuit is electrically connected with the anode of the polar capacitor and one end of the load resistor; and the negative electrode of the polar capacitor and the other end of the load resistor are grounded.
7. The programmable boost DCDC circuit of claim 1, wherein said processing unit is a single chip; the single chip microcomputer is provided with a communication interface; the single chip microcomputer is connected with an external terminal through the communication interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221157335.0U CN217469769U (en) | 2022-05-12 | 2022-05-12 | Programmable boost DCDC circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221157335.0U CN217469769U (en) | 2022-05-12 | 2022-05-12 | Programmable boost DCDC circuit |
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| CN217469769U true CN217469769U (en) | 2022-09-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116126073A (en) * | 2023-02-24 | 2023-05-16 | 北京鸿智电通科技有限公司 | Output voltage regulating circuit applied to quick charging device and quick charging device |
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- 2022-05-12 CN CN202221157335.0U patent/CN217469769U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116126073A (en) * | 2023-02-24 | 2023-05-16 | 北京鸿智电通科技有限公司 | Output voltage regulating circuit applied to quick charging device and quick charging device |
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