CN209823642U - Multi-channel series power supply - Google Patents
Multi-channel series power supply Download PDFInfo
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- CN209823642U CN209823642U CN201920616969.XU CN201920616969U CN209823642U CN 209823642 U CN209823642 U CN 209823642U CN 201920616969 U CN201920616969 U CN 201920616969U CN 209823642 U CN209823642 U CN 209823642U
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Abstract
The utility model discloses a multi-channel series power supply, which comprises a control unit, a voltage source unit, a multi-channel DAC unit, a multi-channel ADC unit, a resistance voltage-dividing unit and a plurality of power output units; the multi-channel DAC unit and the multi-channel ADC unit are respectively provided with a signal conversion channel correspondingly connected with each power output unit; the voltage source unit outputs a total voltage signal; the resistance voltage division unit comprises a plurality of voltage division resistors which are connected in series between the output ends of the voltage source unit and is provided with a plurality of voltage division points; in each power output driving unit, the input end of a reference power supply is connected with one voltage division point in the resistor voltage division unit, and the multichannel ADC unit collects voltage signals at the power output end of each power output driving unit and transmits the voltage signals to the control unit; the control unit controls each power output driving unit to output a power signal with preset voltage through the multi-channel DAC unit. The utility model discloses utilize linear circuit to realize the simulation of multisection battery series connection, can provide multichannel DC power supply simultaneously, and voltage stability, low power dissipation.
Description
Technical Field
The utility model relates to a power technical field, especially a multichannel series connection power.
Background
When a plurality of test devices are used for testing, the switching power supply technology is adopted to simulate the characteristics of the battery, so that working current is provided for objects such as a tested component and the like, and the problem of series connection of a plurality of batteries is solved. However, although the switching power supply can conveniently adopt a high-voltage isolation technology to realize the characteristic simulation of the series connection of the plurality of batteries, the switching power supply has inherent ripples and noises and heating problems, which bring the performance fluctuation of components and power supply, so that the corresponding test equipment can not be used in occasions with higher precision requirements.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a multichannel series connection power, realize the simulation of multisection battery series connection, can provide multichannel DC power supply simultaneously, and voltage stability.
The utility model discloses the technical scheme who takes does: a multi-channel series power supply comprises a control unit, a voltage source unit, a multi-channel DAC unit, a multi-channel ADC unit, a resistance voltage division unit and a plurality of power supply output units; the multi-channel DAC unit and the multi-channel ADC unit are respectively provided with a signal conversion channel correspondingly connected with each power output unit;
the input end of the voltage source unit is connected with an input power supply, and the output end of the voltage source unit outputs a total voltage signal; the resistance voltage division unit comprises a plurality of voltage division resistors which are connected in series between the output ends of the voltage source unit, and a plurality of voltage division points are arranged among the plurality of voltage division resistors in the resistance voltage division unit;
each power output driving unit comprises a reference power input end, a power output end and a feedback control input end; the input end of the reference power supply is connected with one voltage division point in the resistance voltage division unit; the differential voltage between the output ends of the two power output driving units forms an output channel power supply;
the multichannel ADC unit respectively collects the voltage signals at the power output end of the corresponding power output driving unit through each signal conversion channel and transmits the voltage signals to the control unit;
the control unit transmits feedback control signals to the feedback control ends of the corresponding power output driving units through the signal conversion channels in the multi-channel DAC unit respectively so as to control the power output driving units to output power signals with preset voltage values or control differential voltage source signals with preset voltage values to be output between the power output ends of different power output driving units.
The utility model discloses avoided switching power supply to use the ripple of bringing, consequently had the characteristics of high stability high accuracy. Each power output driving unit can be a programmable linear power supply, and the voltage output driving control of the programmable linear power supply by the control unit MCU through the DAC is the prior art.
Preferably, the differential voltage between the output ends of two adjacent power output driving units forms an output channel power supply. And the simulation of the series connection of a plurality of batteries is realized, so that the method is used for testing the battery management system. Of course, the output ends of the non-adjacent power output driving units can be selected to form different test voltage sources for test driving according to requirements. Also the utility model discloses when using, the output of each power output drive unit is as a power output end of the channel power supply of the same kind, also promptly the utility model discloses a single channel output power supply is the differential voltage of two adjacent power output drive unit outputs. Every two adjacent power output driving units can respectively form a plurality of power output ends which are connected with a load to realize driving,
preferably, the voltage of the power output end collected by each signal conversion channel of the multi-channel ADC unit is the voltage to ground of the output end of each power output driving unit, or the differential voltage of the output end of an adjacent power output driving unit.
The control unit collects power output signals through the ADC and compares the power output signals with preset voltage values, and then transmits feedback control signals to corresponding power output driving units through the multi-channel DAC according to comparison results, so that the output voltage of each power output driving unit approaches to the preset channel output power voltage.
Preferably, the power input unit is a programmable linear power supply, the programmable linear power supply is connected to a direct-current power supply signal, and a signal conversion channel corresponding to the programmable linear power supply is arranged in the multi-channel DAC unit; the control unit controls the voltage signal output of the programmable linear power supply through the multi-channel DAC unit. The input of the programmable linear power supply can be connected with a high-voltage switch power supply, and the programmable linear power supply can adopt the existing reference source module. The reference source module is combined with the digital-to-analog conversion DAC, and transmits a voltage setting signal to the DAC through the controller MCU, so that the required voltage is obtained, and the prior art is provided.
Preferably, the power output driving unit includes an output driver, and the output driver includes a reference voltage input terminal, a feedback input terminal, and an output terminal; the reference voltage input end is connected with a voltage dividing point in the resistance voltage dividing unit, the feedback input end is grounded through a feedback resistor, and is connected with the output end through an adjusting resistor; and the signal output end of a signal conversion output channel of the multi-channel DAC unit is connected with the feedback input end. When the driver selects the high-precision voltage follower, the structure forms a high-precision linear programmable power supply form, and high-precision and high-stability power supply output can be realized.
Preferably, the power output driving unit includes an output driver, and the output driver includes a reference voltage input terminal, a feedback input terminal, and an output terminal; the reference voltage input end is connected with a voltage dividing point in the resistance voltage dividing unit, the feedback input end is grounded through the feedback resistor, and is connected with the output end through an adjusting resistor, and is connected with a reverse adjusting power supply through a reverse adjusting resistor. The structural design enables the voltage of the voltage division point to be adjusted in two directions.
Preferably, the voltage dividing points in the resistance voltage dividing unit are defined to be numbered 1-n in sequence from low to high, and then, in the power output driving unit connected to the 1 st to (n-1) th voltage dividing points, the reverse regulation power supply connected to the power output driving unit connected to the ith voltage dividing point is the output end power supply of the power output driving unit connected to the (i +1) th voltage dividing point. The reverse regulation power supply connected to the power output driving unit connected to the nth voltage division point may be the total voltage signal output by the voltage input unit, or may not be provided with the reverse regulation power supply and the corresponding reverse regulation resistor.
Preferably, the driver adopts an operational amplifier or an LDO; when the operational amplifier is adopted, the non-inverting input end of the operational amplifier is connected with the voltage division point, the inverting input end of the operational amplifier is connected with the output end of the signal conversion channel, and the output end of the operational amplifier is the power supply output end of the power supply driving unit.
Preferably, the control unit adopts a single chip microcomputer controller.
Advantageous effects
The utility model discloses a linear circuit realizes the simulation of multisection battery series connection, realizes the output of multichannel test power supply, can be used to battery management system's test etc. has avoided adopting switching power supply as the ripple that the test power supply produced, consequently has characteristics of low noise, high stability and high accuracy.
And simultaneously, the utility model discloses utilize the operational amplifier of high accuracy, low noise or LDO to realize the linear power able to programme of high accuracy for the circuit further ensures the characteristics of low noise, high stability.
In addition, because the output drive of multichannel power has been designed at power output drive unit, put or the LDO improves the driving force through fortune and drive the load, consequently just need not adopt the resistance of low resistance to carry out the partial pressure in order to improve the driving force at resistance voltage divider unit, and can adopt the high resistance to carry out the partial pressure, reduce current has reduced the consumption of circuit self promptly for whole power has the characteristics of low-power consumption, and reducible test procedure in power itself generates heat.
Drawings
FIG. 1 is a schematic block diagram of the principle structure of the present invention;
fig. 2 shows a circuit implementation of the power output driving unit of the present invention;
FIG. 3 shows another circuit implementation of the power output driving unit of the present invention
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
Referring to fig. 1, the multi-channel series power supply of the present invention includes a control unit MCU, a voltage source unit, a multi-channel DAC unit, a multi-channel ADC unit, a resistance voltage divider unit, and a plurality of power output units; the multi-channel DAC unit and the multi-channel ADC unit are respectively provided with a signal conversion channel correspondingly connected with each power output unit;
the input end of the voltage source unit is connected with an input power supply, and the output end of the voltage source unit outputs a total voltage signal; the resistance voltage division unit comprises a plurality of voltage division resistors which are connected in series between the output ends of the voltage source unit, and a plurality of voltage division points are arranged among the plurality of voltage division resistors in the resistance voltage division unit;
each power output driving unit comprises a reference power input end, a power output end and a feedback control input end; the input end of the reference power supply is connected with one voltage division point in the resistance voltage division unit; the differential voltage between the output ends of the two power output driving units forms an output channel power supply;
the multichannel ADC unit respectively collects the voltage signals at the power output end of the corresponding power output driving unit through each signal conversion channel and transmits the voltage signals to the control unit;
the control unit transmits feedback control signals to the feedback control ends of the corresponding power output driving units through the signal conversion channels in the multi-channel DAC unit respectively so as to control the power output driving units to output power signals with preset voltage values or control differential voltage source signals with preset voltage values to be output between the power output ends of different power output driving units.
Example 1
With reference to fig. 1 and fig. 2, in this embodiment, the power input unit is a programmable linear power supply, the programmable linear power supply is connected to a direct current power supply signal, and a signal conversion channel corresponding to the programmable linear power supply is disposed in the multi-channel DAC unit; the control unit controls the voltage signal output of the programmable linear power supply through the multi-channel DAC unit. The input of the programmable linear power supply can be connected with the input of the high-voltage switch power supply, the programmable linear power supply can adopt the existing programmable power supply module which is combined with the digital-to-analog conversion DAC, and the voltage setting signal is transmitted to the DAC through the controller MCU, so that the required voltage is obtained, and the prior art is provided.
Referring to fig. 2, the voltage of the power output terminal collected by each signal conversion channel of the multi-channel ADC unit is the voltage VH to ground of the output terminal of each power output driving unitkOr differential voltage V at the output of the adjacent power output drive unitk-1＝VHk—VHk-1。
The control unit MCU acquires a power supply output signal VH through the ADCkOr Vk-1Comparing with a preset voltage value, and transmitting a feedback control signal C to a corresponding power output driving unit through a multi-channel DAC according to a comparison resultkSo that each power supply outputs the output voltage VH of the drive unitkOr a differential voltage Vk-1The power supply voltage is output close to the preset channel.
The present embodiment preferably outputs the power supply by using the differential voltage at the output ends of two adjacent power output driving units as one channel.
As shown in fig. 2, in the present embodiment, the power output driving unit includes an output driver, and the output driver includes a reference voltage input terminal, a feedback input terminal, and an output terminal; the reference voltage input end is connected with a voltage division point in the resistance voltage division unit and receives a voltage signal VR of the voltage division pointkThe feedback input end is grounded through a feedback resistor R1, and is connected with the output end through an adjusting resistor R2, and the output end outputs a voltage VHk(ii) a The signal output end of the signal conversion output channel of the multi-channel DAC unit outputs a control signal Ck＝VDACkTo the feedback input. When the driver selects the high-precision voltage follower, the structure forms the form of a high-precision linear programmable power supply, and the high-precision linear programmable power supply can be realizedThe power supply output with high precision and high stability is realized.
The driver adopts an operational amplifier or an LDO; when the operational amplifier is adopted, the non-inverting input end of the operational amplifier is connected with the voltage division point, the inverting input end of the operational amplifier is connected with the output end of the signal conversion channel, and the output end of the operational amplifier is the power supply output end of the power supply driving unit. The control unit adopts a singlechip controller.
The working principle of the embodiment is as follows:
the singlechip controller controls the programmable linear power supply to generate a system total voltage V based on the input of the high-voltage switching power supply through one channel in the multi-channel DACGeneral assembly，VGeneral assemblyThe value of is controlled by a singlechip to be programmable
VGeneral assemblyGenerating a voltage VR through an n +1 divider resistor network1-VRnWherein the voltage at the kth voltage division point is VRk＝ VGeneral assemblyV. (n +1) × k, per VRkIs connected with a voltage output driving unit, the voltage output of the voltage output driving unit to the ground is VHk。
The resistor R2 is used as a voltage regulating resistor, and the regulated voltage is Vadjust — VDAC R2/R1.
In a multi-channel DAC (digital-to-analog converter), the conversion value of each channel is set and controlled by the MCU to generate a corresponding output voltage Ck＝VDACkThe voltage generates an accurate current through a feedback resistor R1, the accurate current flows through R2, a voltage Vadjust is generated on R2, and the output voltage is VHk＝VRk+Vadjust。
The high-precision multichannel high-voltage detection circuit ADC can also be replaced by a precisely adjusted tested circuit, and the output voltage VH of each channel or the differential voltage VHk-VHk-1Whether the detected voltage meets the preset requirement or not is detected, if the detected voltage does not meet the preset requirement, the output of the capacitor C is adjusted through a corresponding DAC channel, and then VH is realizedkAnd (4) adjusting.
Example 2
Unlike embodiment 1, referring to fig. 1 and 3, the power output driving unit of this embodiment includes an output driverThe actuator comprises a reference voltage input end, a feedback input end and an output end; the reference voltage input end is connected with a voltage division point in the resistance voltage division unit and receives a voltage signal VR of the voltage division pointkThe feedback input end is grounded through a feedback resistor R1, and is connected with the output end through an adjusting resistor R2, and the output end outputs a voltage VHk(ii) a The feedback input end is also connected with an inverse regulation power supply through an inverse regulation resistor R3, and the structural design enables the voltage of the voltage division point to realize bidirectional regulation.
Defining the voltage division points in the resistance voltage division unit to be numbered as 1-n in sequence from low to high, and then connecting the power output driving units of the 1 st to (n-1) th voltage division points, wherein the reverse adjustment power supply connected to the power output driving unit of the ith voltage division point is the output end power supply of the power output driving unit connected to the (i +1) th voltage division point. The reverse regulation power supply connected to the power output driving unit connected to the nth voltage division point may be the total voltage signal output by the voltage input unit, or may not be provided with the reverse regulation power supply and the corresponding reverse regulation resistor. I.e. VHk+1。
For the total voltage signal of the programmable linear power supply output, the controller is set according to the principle that, for example, the differential output voltage of each power supply output channel is VO, then VGeneral assemblyThe output voltage of (n +1) × VO, n is the number of channels of the output differential power supply, i.e. a bidirectional adjustment space for the highest channel is reserved for the channel voltage.
R2 starts to set a fixed bias voltage, for example, the voltage drop added to VDAC control R2 is 400mV at maximum, and R2 may start to be 200mV at maximum, so VHk may perform two-direction adjustment, that is, VHk ═ VR + adjustment amount, which may be adjusted to increase or decrease, because the current of VDACk has only one direction, the difference between the current of R3 and the current of R1 and the current of R3 is increased, so as to adjust VDAC for the net current flowing through R2, and the direction and magnitude of the current flowing through R2 may be changed, thereby achieving the purpose of bidirectional adjustment.
Based on embodiment 1 and embodiment 2, the utility model discloses a control principle does:
a: if it is desired that the output voltage of each channel is relatively independent:
the value of the differential output voltage VO of each channel is set in the central control unit VOK, and the MCU calculates V according to the set valueGeneral assemblyControl VGeneral assemblyTo meet the requirement, for example, (n +1) × VO, the high-precision ADC simultaneously detects the output voltages VHk of each channel, calculates the differential output voltage Vk-1, compares the difference with a set value, and if there is a large deviation, the control unit adjusts the output control current of the DAC to adjust the voltage of R2, and then adjusts the output voltage, the adjustment mode: VDACk-1+ C [ Vk-1-VOk ]]And the coefficient C represents the speed of the voltage approaching the set voltage value during adjustment, the approaching performance can be improved by adjusting C, and if the error is within a preset range, the adjustment is stopped.
If the adjustment is bidirectional, as shown in FIG. 3, the VDAC needs to have an initial value to compensate the current of R3 due to the insertion of a new current or the insertion of a resistor R3, the initial value is VDACk0＝(VHK+1-VHK) V H R3, since voltage is uniformly distributed in consideration of voltage division nodesK+1-VHK＝VGeneral assembly(n +1), the algorithm for adjusting C is: VDACk＝VDACK-1+C*[VHk-1-VHk]+VDACk0。
B: requiring a uniform differential voltage output, i.e. VH1＝VH2-VH1＝...＝VHn-VHn-1：
The value of the output voltage Vo of each differential channel is set at the central control unit VkoThe central control unit calculates Vtotal according to the set value, controls the Vtotal to meet the requirement, such as (N +1) × Vo, and the high-precision ADC simultaneously detects each path of output differential voltage VkThen, by comparing the measured value with the set value, if there is a large deviation, the control unit adjusts the output control current of the DAC, thereby adjusting the voltage of R2 and thus the output voltage. The adjustment formula is as follows: VDACk＝VdacK-1+C*[Vk-1-VKo]The performance of the approximation can be improved by adjusting C, and if the error is within a settable range, the adjustment is stopped
If it is twoTo adjust, the DAC needs to have an initial value to compensate for the current R3, VDAC, due to the introduction of a new current or the introduction of a resistor R3ko＝(VHK+1-VHK) V/R3, VH considering uniform distribution of voltageK+1-VHK＝VGeneral assembly(N +1), the approximation algorithm for adjusting C is: VDACk＝VDACK-1+C*[Vk-1-VOK]+VADCko。
The utility model discloses an adjustment order does, transfers first passageway V1 earlier, after first passageway satisfies the requirement, adjusts V2 to this analogizes, transfers the Vn adjustment and finishes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (9)
1. A multi-channel series power supply is characterized by comprising a control unit, a voltage source unit, a multi-channel DAC unit, a multi-channel ADC unit, a resistance voltage division unit and a plurality of power supply output units; the multi-channel DAC unit and the multi-channel ADC unit are respectively provided with a signal conversion channel correspondingly connected with each power output unit;
the input end of the voltage source unit is connected with an input power supply, and the output end of the voltage source unit outputs a total voltage signal; the resistance voltage division unit comprises a plurality of voltage division resistors which are connected in series between the output ends of the voltage source unit, and a plurality of voltage division points are arranged among the plurality of voltage division resistors in the resistance voltage division unit;
each power output driving unit comprises a reference power input end, a power output end and a feedback control input end; the input end of the reference power supply is connected with one voltage division point in the resistance voltage division unit; the differential voltage between the output ends of the two power output driving units forms an output channel power supply;
the multichannel ADC unit respectively collects the voltage signals at the power output end of the corresponding power output driving unit through each signal conversion channel and transmits the voltage signals to the control unit;
the control unit transmits feedback control signals to the feedback control ends of the corresponding power output driving units through the signal conversion channels in the multi-channel DAC unit respectively so as to control the power output driving units to output power signals with preset voltage values or control differential voltage source signals with preset voltage values to be output between the power output ends of different power output driving units.
2. The multi-channel series power supply as claimed in claim 1, wherein the voltage of the power output terminal collected by each signal conversion channel of the multi-channel ADC unit is a voltage to ground of the output terminal of each power output driving unit or a differential voltage of the output terminals of adjacent power output driving units.
3. The multi-channel series power supply of claim 1, wherein the control unit collects the power output signal through the ADC and compares the power output signal with a predetermined voltage value, and then transmits a feedback control signal to the corresponding power output driving unit through the multi-channel DAC according to the comparison result, so that the output voltage of each power output driving unit approaches the predetermined channel output power voltage.
4. The multi-channel series power supply as claimed in claim 1, wherein the power supply input unit is a programmable linear power supply, the programmable linear power supply is connected to a direct current power supply signal, and a signal conversion channel corresponding to the programmable linear power supply is arranged in the multi-channel DAC unit; the control unit controls the voltage signal output of the programmable linear power supply through the multi-channel DAC unit.
5. The multi-channel series power supply of claim 1, wherein the power output driver unit comprises an output driver comprising a reference voltage input, a feedback input, and an output; the reference voltage input end is connected with a voltage dividing point in the resistance voltage dividing unit, the feedback input end is grounded through a feedback resistor, and is connected with the output end through an adjusting resistor; and the signal output end of a signal conversion output channel of the multi-channel DAC unit is connected with the feedback input end.
6. The multi-channel series power supply of claim 1, wherein the power output driver unit comprises an output driver comprising a reference voltage input, a feedback input, and an output; the reference voltage input end is connected with a voltage dividing point in the resistance voltage dividing unit, the feedback input end is grounded through the feedback resistor, and is connected with the output end through an adjusting resistor, and is connected with a reverse adjusting power supply through a reverse adjusting resistor.
7. The multi-channel series power supply as claimed in claim 6, wherein the voltage dividing points in the resistor voltage dividing unit are defined as 1-n according to the sequence of voltage from low to high, and the reverse regulation power supply connected to the power output driving unit connected to the ith voltage dividing point in the power output driving unit connected to the 1- (n-1) th voltage dividing point is the output power supply connected to the power output driving unit connected to the (i +1) th voltage dividing point.
8. The multi-channel series power supply as claimed in claim 5 or 6, wherein the driver is an operational amplifier or LDO; when the operational amplifier is adopted, the non-inverting input end of the operational amplifier is connected with the voltage division point, the inverting input end of the operational amplifier is connected with the output end of the signal conversion channel, and the output end of the operational amplifier is the power supply output end of the power supply driving unit.
9. The multi-channel series power supply as claimed in claim 1, wherein the control unit is a single chip controller.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109980926A (en) * | 2019-04-30 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of multichannel series-connection power supplies |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980926A (en) * | 2019-04-30 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of multichannel series-connection power supplies |
| CN109980926B (en) * | 2019-04-30 | 2024-05-14 | 苏州易美新思新能源科技有限公司 | Multichannel serial power supply |
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Address after: Room 1901, building 19, Jianghai Jiayuan, No. 69, Jiangtong Road, Chongchuan District, Nantong City, Jiangsu Province, 226000 Patentee after: Jiangsu Yimei Xinsi New Energy Technology Co.,Ltd. Address before: 215347 room 1003, 1699 Zuchongzhi South Road, Kunshan City, Suzhou City, Jiangsu Province Patentee before: SUZHOU YIMEI XINSI NEW ENERGY TECHNOLOGY Co.,Ltd. |
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