CN209821691U - Direct current power supply circuit - Google Patents
Direct current power supply circuit Download PDFInfo
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- CN209821691U CN209821691U CN201920606149.2U CN201920606149U CN209821691U CN 209821691 U CN209821691 U CN 209821691U CN 201920606149 U CN201920606149 U CN 201920606149U CN 209821691 U CN209821691 U CN 209821691U
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Abstract
The utility model discloses a direct current power supply circuit, which comprises a power supply input unit, a signal conversion unit, a current mirror circuit unit and a voltage output unit; the power input unit is used for outputting reference voltage to the signal conversion unit; the signal conversion unit includes an operational amplifier, a first transistor and a loop resistor R0 for converting a reference voltage signal into a current signal flowing through the current mirror circuit unit, the current mirror circuit unit including a second input power supply, a second transistor Q2 and a third transistor Q3 whose bases are interconnected, and mirror resistors R1 and R2; the voltage output unit comprises a voltage output driver and a resistor string formed by connecting a plurality of resistors in series; the current of the current mirror circuit unit flows through the resistor string in the voltage output unit and further forms the required final output voltage after passing through the output driver. The utility model discloses an output can be used as low pressure or high voltage direct current test power or signal source, and the low noise is little, and output voltage is more stable.
Description
Technical Field
The utility model relates to a DC power supply technical field, especially a DC power supply circuit.
Background
The ripple and noise of the switching power supply are large, and the switching power supply is not suitable for being used as a test power supply or a direct current signal source.
The traditional high voltage regulator (regulated power supply) or low dropout regulator (LDO) has too low internal reference voltage, so that the amplification factor is too large when high voltage is generated, and the power supply is very sensitive to ground noise; the heating of the high voltage linear power supply also causes the power supply to fluctuate.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a direct current power supply circuit, its output can be used as low pressure or high voltage direct current test power supply or signal source, and is little to the low noise, and output voltage is more stable.
The utility model discloses the technical scheme who takes does: a direct current power supply circuit comprises a power supply input unit, a signal conversion unit, a current mirror circuit unit and a voltage output unit;
the power input unit comprises a first input power supply and a reference source circuit, wherein the voltage output end of the first input power supply is connected with the voltage input end of the reference source circuit;
the signal conversion unit comprises an operational amplifier, a first triode and a loop resistor R0; the base electrode of the first triode is connected with the signal output end of the operational amplifier, one end of the loop resistor R0 is simultaneously connected with the inverting input end of the operational amplifier and the emitting electrode of the first triode, and the other end of the loop resistor R0 is grounded; the non-inverting input end of the operational amplifier is connected with the voltage output end of the reference source circuit;
the current mirror circuit unit comprises a second input power supply, a second triode Q2 and a third triode Q3 which are interconnected through bases, and mirror resistors R1 and R2; one end of each of the two image resistors is connected with a second input power supply, and the other end of each of the two image resistors is connected with an emitting electrode of one of the triodes Q2 and Q3; the collector of the Q2/Q3 is connected with the collector of the first triode Q1 and the bases of the Q2 and the Q3;
the voltage output unit comprises a voltage output driver and a resistor string formed by connecting a plurality of resistors in series; one end of the resistor string is connected with a collector of the Q3/Q2, and the other end of the resistor string is grounded; the input end of the voltage output driver is connected between the resistor string and the collector of the Q3/Q2, and the output end is the voltage output end of the direct current power supply circuit.
The utility model discloses in, the mains voltage of first input power output is higher than the output voltage that finally needs to obtain. The power input unit is used for providing reference voltage, the signal conversion unit is used for converting a voltage signal into a current signal, and the current of the current mirror circuit unit flows through the resistor string in the voltage output unit and further forms required output voltage after passing through the output driver.
Since the value of the final output voltage is related to the reference voltage Vref outputted from the reference source circuit, the resistor R0, the resistor in the current mirror circuit unit, and the resistor string, the reference voltage to be outputted from the power input unit can be inversely estimated according to the required final output voltage. Meanwhile, under the condition of determined voltage output, the larger the reference voltage provided by the power input unit is, the smaller the resistance value in the resistor string is, and the smaller the sensitivity to ground noise is. The utility model discloses a direct current power supply circuit is applicable in the output of high pressure or low-voltage direct current source, and the comprehensive application of fortune is put, triode and current mirror circuit unit makes final output voltage have better stability and precision, reduces greatly to ground noise.
Furthermore, in the power input unit of the present invention, the reference source circuit is a programmable power supply, and includes a reference source module and a DAC module, where the DAC module includes a voltage setting terminal for receiving an external voltage setting signal; the reference voltage output end of the reference source module is connected with the reference voltage end of the digital-to-analog converter, and the analog signal output end of the digital-to-analog converter is connected with the non-inverting input end of the operational amplifier. This kind of form makes the utility model discloses the output of adaptable various magnitude of voltage only needs according to output voltage adjustment external voltage set signal can. The reference source module is combined with the digital-to-analog conversion module DAC, and then a voltage setting signal is transmitted to the DAC through the controller or the upper computer, so that a required voltage reference signal is obtained, and the method belongs to the prior art.
Furthermore, the utility model discloses in the resistance string of voltage output unit, still be connected with the voltage on the tie point between at least one adjacent resistance and take a percentage. Can be used for outputting DC voltage with different value from the output end of the voltage output driver.
Preferably, the resistances of the resistors in the resistor string are the same and equal to the resistance of the loop resistor R0. The reverse thrust from the required output voltage to the reference voltage is simplified, the design of the circuit is convenient, and particularly, the calculation of the voltage setting value is easier when the reference source circuit adopts a programmable power supply. The loop resistor R0 is a high-precision low-temperature-drift resistor.
Preferably, the loop resistor R0 and the resistors R1 and R2 in the current mirror circuit unit are resistors formed by connecting a plurality of unit resistors Runit in parallel or in series. The method is convenient for global calculation, and under the condition that the output voltage is determined, the larger the Vref is, the smaller the number of unit resistors in the resistor string can be, and the sensitivity to ground noise becomes smaller.
Preferably, the first transistor Q1 is an NPN transistor, and the second transistor Q2 and the third transistor Q3 are PNP transistors.
Preferably, the voltage output driver adopts an operational amplifier or an LDO, i.e., a low dropout linear regulator. The operational amplifier can adopt an LTC6090 high-voltage operational amplifier chip, has the characteristics of high precision and low noise, can realize driving and simultaneously ensure the stability of output voltage, and reduces low noise. The voltage output driver M2 may be any device capable of tracking the input voltage and having low noise and high stability.
Preferably, the reference source circuit adopts a high-precision low-noise reference source module, such as an existing product of a model LT 123610V reference source or a REF3033 reference source. Namely the utility model discloses a reference source circuit can directly adopt the reference source module of high accuracy low noise, provides the reference voltage of high accuracy low noise for operational amplifier, from the high accuracy low noise of source guarantee output voltage.
Preferably, the first input power supply and the second input power supply are the same input voltage source, and the output end of the input voltage source is connected with the reference voltage source after passing through the voltage reduction circuit. The combination of the two power supplies can simplify the circuit structure, and in this case, the voltage output of the second input power supply is considered to be larger than the voltage output of the circuit output end, so that the input voltage source with higher output voltage needs to provide a voltage signal for the reference voltage source through the voltage reduction circuit according to the required reference voltage. The voltage reduction circuit can adopt the prior art.
Advantageous effects
The utility model discloses a provide reference voltage to converting reference voltage into current signal, transmit current signal to the resistor string through current mirror circuit unit again, and then obtain required output voltage. The reference voltage has stability and can be generated by adopting a low-noise reference source, and the current mirror circuit unit has strong inhibition on the circuit voltage fluctuation, so that the finally output voltage has the characteristics of high stability and low noise.
Furthermore, the utility model discloses a setting up of each link resistance value relation makes by required output voltage to reference voltage's backstepping more simple, has simplified circuit design. When the reference source is implemented by an external voltage setting signal through a programmable power supply, the logic of voltage setting is simplified.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of a dc power circuit according to the present invention;
fig. 2 is a schematic circuit diagram of another embodiment of the present invention.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
With reference to fig. 1 and fig. 2, the dc power circuit of the present invention includes a power input unit, a signal conversion unit, a current mirror circuit unit, and a voltage output unit;
the power input unit comprises a first input power supply and a reference source circuit, wherein the voltage output end of the first input power supply is connected with the voltage input end of the reference source circuit;
the signal conversion unit comprises an operational amplifier, a first triode and a loop resistor R0; the base electrode of the first triode is connected with the signal output end of the operational amplifier, one end of the loop resistor R0 is simultaneously connected with the inverting input end of the operational amplifier and the emitting electrode of the first triode, and the other end of the loop resistor R0 is grounded; the non-inverting input end of the operational amplifier is connected with the voltage output end of the reference source circuit; the operational amplifier M1 may be LTC6090 or another high-performance operational amplifier with a low withstand voltage.
The current mirror circuit unit comprises a second input power supply, a second triode Q2 and a third triode Q3 which are interconnected through bases, and mirror resistors R1 and R2; one end of each of the two image resistors is connected with a second input power supply, and the other end of each of the two image resistors is connected with an emitting electrode of one of the triodes Q2 and Q3; the collector of the Q2/Q3 is connected with the collector of the first triode Q1 and the bases of the Q2 and the Q3;
the voltage output unit comprises a voltage output driver and a resistor string formed by connecting a plurality of resistors in series; one end of the resistor string is connected with a collector of the Q3/Q2, and the other end of the resistor string is grounded; the input end of the voltage output driver is connected between the resistor string and the collector of the Q3/Q2, and the output end is the voltage output end of the direct current power supply circuit.
The utility model discloses in, the mains voltage of first input power output is higher than the output voltage that finally needs to obtain. The power input unit is used for providing reference voltage, the signal conversion unit is used for converting a voltage signal into a current signal, and the current of the current mirror circuit unit flows through the resistor string in the voltage output unit and further forms required output voltage after passing through the output driver.
Since the value of the final output voltage is related to the reference voltage Vref outputted from the reference source circuit, the resistor R0, the resistor in the current mirror circuit unit, and the resistor string, the reference voltage to be outputted from the power input unit can be inversely estimated according to the required final output voltage. Meanwhile, under the condition of determined voltage output, the larger the reference voltage provided by the power input unit is, the smaller the resistance value in the resistor string is, and the smaller the sensitivity to ground noise is. The utility model discloses a direct current power supply circuit is applicable in the output of high pressure or low-voltage direct current source, and the comprehensive application of fortune is put, triode and current mirror circuit unit makes final output voltage have better stability and precision, reduces greatly to ground noise.
Example 1
Referring to fig. 1, in the dc power circuit of this embodiment, the reference source circuit directly adopts an existing high-precision low-noise reference source module product, and provides a high-precision low-noise reference voltage Vref for the operational amplifier based on the first input power, so as to ensure high precision and low noise of the output voltage from the source.
The operational amplifier M1 is a high-precision low-noise operational amplifier, the Q1 is an NPN transistor, the resistor R0 is a high-precision low-temperature-drift resistor, and the voltage output driver M2 is a high-precision low-noise operational amplifier. M1, Q1 and R0 form a voltage-to-current circuit, and the current generated by R0 is: iref = Vref/R0.
The second input power Vdd, the resistors R1 and R2, and the PNP transistors Q2 and Q3 constitute a current mirror circuit unit. Since one current arm of the current mirror circuit unit is connected to the collector of Q1 and then grounded via R0, the current flowing through the resistor R1 in the current arm is regarded as Iref. According to the current correspondence relationship in the current mirror circuit unit, the current flowing through the resistor R2 in the other current arm is: io = Iref R1/R2. The current flowing through the current arm also flows through the resistor string, after the voltage division is carried out on the resistor string, the voltage of the leading-out point at the front end of the resistor string is subjected to voltage output driving operational amplification to obtain the final output voltage which is the following voltage: vo = Io R3, R3 is the resistance of the resistor string. Substituting Io = Iref R1/R2 and Iref = Vref/R0 shows that the final output voltage Vo is related only to the reference voltage Vref, the resistor R0, the resistor in the current mirror circuit unit, and the resistor string, and therefore the reference voltage required to be output by the power supply input unit can be inversely estimated according to the required final output voltage.
Considering the case that the resistor string is formed by connecting n equivalent resistors or unit resistors Runit in series, which are the same as R0, Vo = Io × n R0 or Vo = Io × n Runit, and meanwhile, in the case of a determined voltage output, the larger the reference voltage Vref provided by the power supply input unit is, the smaller the resistance value in the resistor string is, the sensitivity to ground noise is, and a higher-voltage reference source Vref is used in combination with the signal conversion circuit to obtain a current with higher stability.
Meanwhile, R0, R1 and R2 can be connected in series or in parallel by unit resistors Runit to form corresponding resistance values, for example, R0= a Runit, R1= b Runit, R2= c Runit, R3= n Runit, and then Vo = Vref/a b/c n, so that the circuit has good heat tracking performance and matching performance.
In order to simplify the circuit, the first input power supply and the second input power supply Vdd are derived from the same power supply input module, and the second input power supply Vdd is considered to be higher than the reference voltage Vref, so that the output end of the power supply input module provides a voltage source to the reference source module through the voltage reduction circuit.
For each resistor in fig. 1, the thermal stability of the circuit can be further balanced by choosing a large resistor to reduce the current.
In the resistor string, a middle tap can be respectively arranged between any two resistors and is used for leading out direct current power supplies with different voltage values.
The voltage output driver M2 adopts a high-precision low-noise operational amplifier, the power supply terminal of the operational amplifier M2 is connected to the power supply Vdd, and the input terminal and the output terminal are connected in a conventional voltage following manner (the input is connected with the positive phase, and the feedback is connected with the negative phase). Page M2 may also be LDO.
Example 2
Referring to fig. 2, the difference between this embodiment and embodiment 1 is that, in the power input unit, the reference source circuit is a programmable power supply, and includes a reference source module and a DAC module, where the DAC module includes a voltage setting terminal for receiving an external voltage setting signal; the reference voltage output end of the reference source module is connected with the reference voltage end of the digital-to-analog converter to transmit a reference power Vref, and the analog signal output end of the digital-to-analog converter is connected with the non-inverting input end of the operational amplifier to output a voltage Vp. The upper computer writes a preset numerical value into the DAC, so that the DAC generates the voltage Vp, and further, the required Vo can be generated. In this case, the current flowing through R1 in the current mirror current is: iref = Vp/R0. This kind of form makes the utility model discloses the output of adaptable various magnitude of voltage only needs according to output voltage adjustment external voltage set signal can.
The reference source module is combined with the digital-to-analog conversion module DAC, and then a voltage setting signal is transmitted to the DAC through the controller or the upper computer, so that a required voltage reference signal is obtained, and the method belongs to the prior art.
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 direct current power supply circuit is characterized by comprising a power supply input unit, a signal conversion unit, a current mirror circuit unit and a voltage output unit;
the power input unit comprises a first input power supply and a reference source circuit, wherein the voltage output end of the first input power supply is connected with the voltage input end of the reference source circuit;
the signal conversion unit comprises an operational amplifier, a first triode Q1 and a loop resistor R0; the base electrode of the first triode is connected with the signal output end of the operational amplifier, one end of the loop resistor R0 is simultaneously connected with the inverting input end of the operational amplifier and the emitting electrode of the first triode, and the other end of the loop resistor R0 is grounded; the non-inverting input end of the operational amplifier is connected with the voltage output end of the reference source circuit;
the current mirror circuit unit comprises a second input power supply, a second triode Q2 and a third triode Q3 which are interconnected through bases, and mirror resistors R1 and R2; one end of each of the two image resistors is connected with a second input power supply, and the other end of each of the two image resistors is connected with an emitting electrode of one of the triodes Q2 and Q3; the collector of the Q2/Q3 is connected with the collector of the first triode Q1 and the bases of the Q2 and the Q3;
the voltage output unit comprises a voltage output driver and a resistor string formed by connecting a plurality of resistors in series; one end of the resistor string is connected with a collector of the Q3/Q2, and the other end of the resistor string is grounded; the input end of the voltage output driver is connected between the resistor string and the collector of the Q3/Q2, and the output end is the voltage output end of the direct current power supply circuit.
2. The direct current power supply circuit of claim 1, wherein in the power supply input unit, the reference source circuit is a programmable power supply and comprises a reference source module and a DAC module, the DAC module comprises a voltage setting terminal for receiving an external voltage setting signal; the reference voltage output end of the reference source module is connected with the reference voltage end of the digital-to-analog converter, and the analog signal output end of the digital-to-analog converter is connected with the non-inverting input end of the operational amplifier.
3. The direct current power supply circuit according to claim 1 or 2, wherein a voltage tap is further connected to a connection point between at least one adjacent resistor in the resistor string of the voltage output unit.
4. A dc power supply circuit as claimed in claim 1 or 2, wherein the resistances of the resistors in the resistor string are the same and equal to the resistance of the loop resistor R0.
5. The dc power supply circuit according to claim 1 or 2, wherein the loop resistor R0 and the resistors R1 and R2 in the current mirror circuit unit are resistors formed by connecting a plurality of unit resistors Runit in parallel or in series.
6. The dc power supply circuit as claimed in claim 1 or 2, wherein the first transistor Q1 is an NPN transistor, and the second transistor Q2 and the third transistor Q3 are PNP transistors.
7. The dc power supply circuit according to claim 1 or 2, wherein the voltage output driver is an operational amplifier or LDO.
8. The dc power supply circuit of claim 1, wherein the reference source circuit uses a high-precision low-noise reference source module.
9. The direct current power supply circuit according to claim 1 or 2, wherein the first input power supply and the second input power supply are the same input voltage source, and an output end of the input voltage source is connected to a reference voltage source after passing through the voltage reduction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920606149.2U CN209821691U (en) | 2019-04-29 | 2019-04-29 | Direct current power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920606149.2U CN209821691U (en) | 2019-04-29 | 2019-04-29 | Direct current power supply circuit |
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| CN209821691U true CN209821691U (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109976430A (en) * | 2019-04-29 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of DC power supply circuit |
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2019
- 2019-04-29 CN CN201920606149.2U patent/CN209821691U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109976430A (en) * | 2019-04-29 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of DC power supply circuit |
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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. |