CN210428227U - Output voltage regulator of power module - Google Patents
Output voltage regulator of power module Download PDFInfo
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- CN210428227U CN210428227U CN201921547077.5U CN201921547077U CN210428227U CN 210428227 U CN210428227 U CN 210428227U CN 201921547077 U CN201921547077 U CN 201921547077U CN 210428227 U CN210428227 U CN 210428227U
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Abstract
The utility model relates to a power module's output voltage adjusting device, power module has a voltage output end, first resistance is connected to the voltage output end, adjusting device includes: the DA converter is connected to the voltage output end through a second resistor; and the controller is connected to the control end of the DA converter and controls the DA converter to output a variable voltage. The utility model is not only simple in structure reliable, it is effectual to adjust moreover, and the cost of required hardware is lower, is favorable to reducing the manufacturing cost of equipment, widens power module's range of application simultaneously.
Description
Technical Field
The utility model relates to a power technical field, in particular to power module's output voltage adjusting device.
Background
The power module is a constant current source or a constant voltage source, is used for supplying power to a circuit module, a chip or an electronic component in equipment, and is generally designed and manufactured by manufacturers to be manufactured into a finished product for sale.
As shown in fig. 1, the conventional DC/DC power module is used to convert the input voltage into a fixed DC voltage output, and the user can only adjust the output voltage by connecting the corresponding resistors in series, once the fixed resistor R1, V is usedOADJThe output voltage of (d) is constant. In practical applications, some devices require dynamicsThe output voltage is adjusted, and when the circuit device is supplied with power, voltages required by each module, each circuit, and each chip are different, and the output voltage needs to be changed at any time. If the power supply module can not adjust the output voltage, the application range of the power supply module can be limited, and the requirements of people on components capable of dynamically outputting the voltage can not be met.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for an output voltage regulator of a power module, which can dynamically regulate the output voltage.
In order to achieve the above purpose, the present invention adopts the following technical solutions.
The utility model provides a power module's output voltage adjusting device, power module has a voltage output end, first resistance is connected to the voltage output end, adjusting device includes:
the DA converter is connected to the voltage output end through a second resistor; and
and the controller is connected to the control end of the DA converter and controls the DA converter to output a variable voltage.
In the above-mentioned adjusting device, still include:
and the controller is connected with the feedback circuit and corrects the output voltage of the DA converter in real time through the feedback circuit.
In the above adjusting apparatus, the controller is an onboard CPU.
The adjusting device further comprises a memory, and the memory is mounted on the CPU.
The utility model discloses a connect a DA converter and a controller at power module's voltage output end to make controller control DA converter, make DA converter output a variable voltage, connect in parallel with the voltage that power module's voltage output end exported, thereby reach the purpose of adjusting power module's output voltage. The utility model is not only simple in structure reliable, it is effectual to adjust moreover, and the cost of required hardware is lower, is favorable to reducing the manufacturing cost of equipment, widens power module's range of application simultaneously.
Drawings
FIG. 1 is a circuit diagram of an exemplary prior art power module;
fig. 2 is a schematic structural diagram of an adjusting device according to a first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an adjusting device according to a second embodiment of the present invention.
The purpose of the present invention, its function and principle will be further elucidated in the detailed description with reference to the accompanying drawings.
Detailed Description
The following further description is made with reference to the drawings and specific embodiments.
The first embodiment is as follows:
as shown in fig. 2, this embodiment provides an output voltage regulator of a power module, where the power module is a DC/DC constant voltage source and has a voltage output terminal VOADJFor outputting a constant voltage, in use, at a voltage output terminal VOADJA first resistor R1 is connected in series for output to supply power for subsequent circuits or electronic components.
The adjusting device of the embodiment comprises:
the DA converter is connected to the voltage output end through a second resistor;
and the controller is connected to the control end of the DA converter and controls the DA converter to output a variable voltage.
In this embodiment, the AD5300 can be used as a DA converter, which is mainly composed of a digital register, an analog electronic switch, a summing operational amplifier, and a reference voltage source (or constant current source) VCC, and is connected to a voltage source VOUTThe terminal outputs a voltage and is connected to V of the power supply module through a second resistor R2OADJTerminal of and VOADJAfter the voltages output by the terminals are connected in parallel, the power is supplied to the outside through a first resistor R1.
In addition, the controller is connected with the control end of the DA converter and is used for controlling the output digital register of the DA converter to enable VOADJThe output voltage of the terminal is variable.
Specifically, let V of the power moduleOADJThe output voltage of the terminal is VfbOutput current is I1V of DA converterOUTThe output voltage of the terminal is Vdac，VdacAnd VfbWill generate an output current I2And satisfies:
I2＝(Vdac-Vfb)/R2； (1)
I3＝Vfb/R1； (2)
according to the circuit principle, the total current I of the external power supply3＝I1+I2(3)
(1) (2) simultaneous reaction of the three formulas (3) to obtain Vdac＝Vfb+(R2Vfb-I1R1R2)/R1, wherein I1，VfbR1 and R2 are known, and V can be calculateddacThe value of (c).
The controller can be an onboard CPU (central processing unit), comprises a single chip microcomputer or an MCU (micro control unit) chip, and is connected with the control end of the DA converter through a serial bus interface to realize the control of the DA converter.
Further, the present embodiment may also perform automatic voltage regulation management in a mapping table manner, so as to dynamically output voltages required by different chips or electrical components. The following steps may be employed:
s4: and loading a mapping table to a CPU (Central processing Unit), so that the CPU automatically adjusts the output voltage of the DA converter according to the mapping table.
Specifically, the step S4 further includes:
s41: generating a mapping table according to the electrical characteristics of the chip, wherein the mapping table comprises the model of the chip and the working voltage corresponding to the model of the chip;
s42: generating a corresponding pulse sequence according to the mapping table;
s43: and inputting the pulse sequence into the CPU as required, enabling the CPU to obtain the working voltage of the corresponding chip according to the pulse sequence, and adjusting the output voltage of the DA converter to supply power to the chip.
For example: the type of the chip 1 is 001, and the working voltage is 1V; the model of the chip 2 is 002, and the working voltage is 1.04V; … … if the model of chip N is 00N and its working voltage is 0.9V, then the following mapping table is generated:
| 001——>1； | D1 |
| 002——>1.04； | D2 |
| …… | …… |
| 00N——>0.9； | DN |
wherein D is1～DNEach pulse sequence corresponds to an input pin of the CPU. When the chip 1 needs to be powered, the pulse sequence is input into corresponding D1At the pin, the CPU obtains that the chip needing power supply is a 001-type chip according to the pre-designed parameters of the D1 pin, the working voltage of the chip is 1V, and at the moment, the register of the DA converter is adjusted to enable the output voltage of the register to meet the V requirementdac＝Vfb+(R2Vfb-I1R1R2)/R1, wherein,
Vfb1, simultaneous representation of the above formula, to give Vdac＝1+(R2-I1R1R2)/R1。
By analogy, the output voltage of the DA converter can be obtained when the chips 2-N are supplied with power respectively.
This is convenient for implementing automatic control, and this embodiment also configures a memory, which is mounted on the CPU and used for storing the mapping table, so that when power needs to be supplied to a certain chip, the mapping table is automatically read from the memory, and the DA converter is used to output the required voltage.
Therefore, the output voltage of the power supply module can be adjusted through the circuit, and if the output power of the power supply module is larger, the output voltage can be finely adjusted.
Example two:
referring to fig. 3, the present embodiment further provides an output voltage regulator of a power module, and the first embodiment of the present embodiment is mainly characterized in that the output voltage regulator further includes:
and the controller corrects the output voltage of the DA converter in real time through the feedback circuit.
The feedback circuit is used for detecting the current I3Or voltage VdacAnd fed back to the controller, which analyzes the current I3Or voltage VdacIs adjusted until the actual value is the same as the target value.
Preferably, the controller is an on-board CPU.
The device also comprises a memory, wherein the memory is mounted on the CPU and stores a mapping table, the mapping table comprises chip types and working voltages corresponding to the chip types, and the CPU is suitable for acquiring the working voltages of the chips corresponding to the pulse sequences when the pulse sequences generated according to the mapping table are input, adjusting the output voltage of the DA converter and supplying power to the chips.
The functions, principles, and features of the output voltage regulator of the power module of this embodiment may refer to the first embodiment, and are not described herein again.
To sum up, the utility model discloses a connect a DA converter and a controller at power module's voltage output end to make controller control DA converter, make DA converter output variable voltage, parallelly connected with the voltage that power module's voltage output end exported, thereby reach the purpose of adjusting power module's output voltage. The utility model is not only simple in structure reliable, it is effectual to adjust moreover, and the cost of required hardware is lower, is favorable to reducing the manufacturing cost of equipment, widens power module's range of application simultaneously.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (4)
1. An output voltage regulator for a power module, the power module having a voltage output terminal connected to a first resistor, the regulator comprising:
the DA converter is connected to the voltage output end through a second resistor; and
and the controller is connected to the control end of the DA converter and controls the DA converter to output a variable voltage.
2. The output voltage regulator of claim 1, further comprising:
and the controller is connected with the feedback circuit and corrects the output voltage of the DA converter in real time through the feedback circuit.
3. The output voltage regulator of a power supply module according to claim 1 or 2, wherein the controller is an on-board CPU.
4. The output voltage regulator of claim 3, further comprising a memory, said memory being mounted on said CPU.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921547077.5U CN210428227U (en) | 2019-09-18 | 2019-09-18 | Output voltage regulator of power module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921547077.5U CN210428227U (en) | 2019-09-18 | 2019-09-18 | Output voltage regulator of power module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488901A (en) * | 2019-09-18 | 2019-11-22 | 深圳市友华通信技术有限公司 | The output voltage adjusting method and device of power module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488901A (en) * | 2019-09-18 | 2019-11-22 | 深圳市友华通信技术有限公司 | The output voltage adjusting method and device of power module |
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