CN215452766U - Driving circuit based on programmable switching power supply - Google Patents
Driving circuit based on programmable switching power supply Download PDFInfo
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- CN215452766U CN215452766U CN202121493157.4U CN202121493157U CN215452766U CN 215452766 U CN215452766 U CN 215452766U CN 202121493157 U CN202121493157 U CN 202121493157U CN 215452766 U CN215452766 U CN 215452766U
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Abstract
The utility model provides a drive circuit based on a programmable switching power supply, wherein a noise suppression circuit of the drive circuit is respectively connected with the programmable switching power supply, a main control circuit and a sampling circuit; one end of the sampling circuit is connected with the noise suppression circuit, and the other end of the sampling circuit is connected with the load; two ends of a first-stage noise suppression circuit of the noise suppression circuit are respectively connected with the programmable switching power supply and the sampling circuit, a second-stage noise suppression circuit is connected with the sampling circuit, one end of the bias noise suppression circuit is connected with the sampling circuit and the second-stage noise suppression circuit, the other end of the bias noise suppression circuit is connected with a third-stage noise suppression circuit, and the output end of the third-stage noise suppression circuit is connected with the main control circuit. The utility model processes the noise in the voltage signal by the noise suppression circuit and transmits the processed noise to the main control circuit, thereby avoiding the influence of the noise on the current measurement, flexibly outputting the required voltage, meeting the requirement of high-precision weak current measurement and being convenient for effectively protecting and controlling electronic products.
Description
Technical Field
The utility model relates to the field of current measurement of a driving circuit, in particular to a driving circuit based on a programmable switching power supply.
Background
Under the rapid development trend of the science and technology industry, electronic products need various voltage drives, and when the circuits are used, the voltage drives are often needed to output voltages with different sizes according to application environments or user requirements. Therefore, the voltage drive of the fixed output cannot meet the demand, and the programmable power supply is increasingly used in electronic products. However, the programmable power supply is accompanied by noise when outputting voltage, the noise seriously affects the measurement accuracy of weak current, and it is difficult to accurately obtain the current driving current when driving an electronic product, and thus the electronic product cannot be effectively controlled and protected.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a drive circuit based on a programmable switching power supply, wherein a noise suppression circuit and a sampling circuit are arranged in the drive circuit, the noise suppression circuit is used for suppressing the noise in the drive circuit based on the programmable switching power supply, the voltage signal of the sampling circuit is transmitted to the noise circuit, and the noise in the voltage signal is processed by the noise suppression circuit and then transmitted to a main control circuit, so that the influence of the noise on current measurement is avoided, the required voltage can be flexibly output, the requirement of high-precision weak current measurement is met, and the electronic product is conveniently and effectively protected and controlled.
In order to solve the above problems, the present invention adopts a technical solution as follows: a programmable switching power supply based driver circuit, the programmable switching power supply based driver circuit comprising: the noise suppression circuit is respectively connected with the programmable switching power supply, the main control circuit and the sampling circuit; one end of the sampling circuit is connected with the noise suppression circuit, and the other end of the sampling circuit is connected with a load and used for converting a current signal in the driving circuit into a voltage signal; noise suppression circuit includes one-level noise suppression circuit, second grade noise suppression circuit, bias noise suppression circuit, tertiary noise suppression circuit, one-level noise suppression circuit both ends respectively with programmable switching power supply, sampling circuit connect, second grade noise suppression circuit with sampling circuit connects, bias noise suppression circuit one end with sampling circuit, second grade noise suppression circuit connect, the other end with tertiary noise suppression circuit connects, tertiary noise suppression circuit's output with master control circuit connects, noise suppression circuit is arranged in the noise of filtering drive circuit and behind the noise of will filtering voltage signal transmits for master control circuit so that master control circuit passes through current in the voltage signal measurement drive circuit.
Furthermore, the driving circuit based on the programmable switching power supply further comprises a signal acquisition circuit, wherein the input end of the signal acquisition circuit is connected with the three-level noise suppression circuit, and the output end of the signal acquisition circuit is connected with the main control circuit and is used for outputting the voltage signal to the main control circuit after analog-to-digital conversion.
Furthermore, the drive circuit based on the programmable switching power supply further comprises a feedback circuit, the feedback circuit comprises a feedback circuit noise filter and a control output feedback circuit, two ends of the feedback circuit noise filter and the control output feedback circuit are respectively connected with the output ends of the programmable switching power supply and the sampling circuit, the control output feedback circuit is further connected with the main control circuit, and the main control circuit performs output feedback through the control output feedback circuit.
Further, the control output feedback circuit comprises a first operational amplifier, a first resistor and a second resistor, wherein the output end of the first operational amplifier is connected with the feedback end of the programmable switching power supply and the first end of the first resistor respectively, the second end of the first resistor is connected with the first input end of the first operational amplifier, the first end of the second resistor is connected with the second input end of the first operational amplifier, the second end of the second resistor is connected with the main control circuit, and the main control circuit is connected with the output end of the sampling circuit.
Further, the feedback circuit noise filter includes a first capacitor, a second capacitor, a third resistor, a fourth resistor, and a fifth resistor, where first ends of the first capacitor and the second capacitor are connected to the compensation end of the programmable switching power supply, a second end of the first capacitor is connected to a first end of the third resistor, a second end of the third resistor is connected to a second end of the second capacitor, first ends of the fourth resistor and the fifth resistor are connected to a second end of the third resistor, a second end of the fifth resistor is connected to a first end of the third capacitor, and a second end of the third capacitor is connected to a second end of the fourth resistor and an output end of the sampling circuit.
Furthermore, the primary noise suppression circuit includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a first inductor, one end of the first inductor is connected to the voltage output terminal of the programmable switching power supply and the first ends of the fourth capacitor and the sixth capacitor, the other end of the first inductor is connected to the first ends of the fifth capacitor and the seventh capacitor, and the second ends of the fourth capacitor, the fifth capacitor, the sixth capacitor, and the seventh capacitor are grounded.
Furthermore, the second-stage noise suppression circuit comprises an eighth capacitor and a ninth capacitor, wherein the first end of the eighth capacitor is connected with the input end of the sampling circuit and the first end of the seventh capacitor, the second end of the eighth capacitor is grounded, the first end of the ninth capacitor is connected with the output end of the sampling circuit, and the second end of the ninth capacitor is grounded.
Further, the bias noise suppression circuit includes a differential amplifier, a sixth resistor, a seventh resistor, and an eighth resistor, where a first input terminal of the differential amplifier is connected to the input terminal of the sampling circuit, a first power terminal of the differential amplifier, a first terminal of the sixth resistor, and a first terminal of the seventh resistor, a second input terminal of the differential amplifier is connected to the output terminal of the sampling circuit, a second power terminal of the differential amplifier, a second terminal of the seventh resistor, and a first terminal of the eighth resistor, an output terminal of the differential amplifier is connected to the three-stage noise suppression circuit, and an adjustment terminal of the seventh resistor is connected to the main control circuit.
Further, the three-level noise suppression circuit includes a ninth resistor, a tenth capacitor, a tenth resistor, an eleventh capacitor, and a second operational amplifier, wherein a first end of the ninth resistor is connected to the output end of the differential amplifier, a second end of the ninth resistor is connected to a first end of the tenth capacitor and a non-inverting input end of the second operational amplifier, a second end of the tenth capacitor is connected to an inverting input end of the differential amplifier, a first end of the tenth resistor and a first end of the eleventh capacitor, and an output end of the second operational amplifier is connected to a second end of the tenth resistor, a second end of the eleventh capacitor, and the main control circuit.
Furthermore, the drive circuit based on the programmable switching power supply further comprises an upper computer, the upper computer is in communication connection with the main control circuit, and the upper computer acquires current measurement information of the drive circuit through the main control circuit.
Compared with the prior art, the utility model has the beneficial effects that: the noise suppression circuit and the sampling circuit are arranged in the driving circuit, noise in the driving circuit is filtered by the noise suppression circuit, a voltage signal of the sampling circuit is transmitted to the noise circuit, and the noise in the voltage signal is processed by the noise suppression circuit and then transmitted to the main control circuit, so that the influence of the noise on current measurement is avoided, the required voltage can be flexibly output, the requirement of high-precision weak current measurement is met, and the electronic product is conveniently and effectively protected and controlled.
Drawings
FIG. 1 is a block diagram of an embodiment of a programmable switching power supply based driving circuit according to the present invention;
FIG. 2 is a block diagram of another embodiment of a programmable switching power supply based driver circuit according to the present invention;
fig. 3 is a circuit diagram of an embodiment of a driving circuit based on a programmable switching power supply according to the present invention.
In the figure: r6, a sampling resistor; l1, a second inductor; d1, a first diode; U2A, a first operational amplifier; r1, a first resistor; r2, a second resistor; c1, a first capacitance; c2, a second capacitor; c3, a third capacitance; r3, third resistor; r4, fourth resistor; r5, fifth resistor; c4, a fourth capacitance; c5, a fifth capacitance; l2, a first inductor; c6, a sixth capacitor; c7, a seventh capacitance; c8, an eighth capacitor; c9, ninth capacitance; U1A, differential amplifier; r8, sixth resistor; r10, eighth resistor; r9, seventh resistor; r7, ninth resistor; c10, tenth capacitance; r11, tenth resistor; c11, an eleventh capacitor; U1B, a second operational amplifier.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Referring to fig. 1-3, fig. 1 is a structural diagram of a driving circuit based on a programmable switching power supply according to an embodiment of the present invention; FIG. 2 is a block diagram of another embodiment of a programmable switching power supply based driver circuit according to the present invention; fig. 3 is a circuit diagram of an embodiment of the driving circuit based on the programmable switching power supply of the present invention, and the driving circuit based on the programmable switching power supply of the present invention is described in detail with reference to fig. 1-3.
In this embodiment, the driving circuit based on the programmable switching power supply includes: the noise suppression circuit is respectively connected with the programmable switching power supply, the noise suppression circuit, the main control circuit and the sampling circuit; one end of the sampling circuit is connected with the noise suppression circuit, and the other end of the sampling circuit is connected with the load and used for converting a current signal in the driving circuit into a voltage signal; the noise suppression circuit comprises a primary noise suppression circuit, a secondary noise suppression circuit, a bias noise suppression circuit and a tertiary noise suppression circuit, wherein two ends of the primary noise suppression circuit are respectively connected with the programmable switching power supply and the sampling circuit, the secondary noise suppression circuit is connected with the sampling circuit, one end of the bias noise suppression circuit is connected with the sampling circuit and the secondary noise suppression circuit, the other end of the bias noise suppression circuit is connected with the tertiary noise suppression circuit, the output end of the tertiary noise suppression circuit is connected with the main control circuit, and the noise suppression circuit is used for filtering noise in the driving circuit and transmitting a voltage signal after the noise is filtered to the main control circuit so that the main control circuit measures current in the driving circuit through the voltage signal.
In this embodiment, the sampling circuit includes a sampling resistor R6, the sampling resistor R6 converts the current signal into a voltage signal, and the offset noise suppression circuit collects the voltage signal at two ends of the sampling resistor R6, amplifies the voltage signal, performs noise suppression processing on the voltage signal, and transmits the amplified voltage signal to the three-stage noise suppression circuit.
In this embodiment, the input terminal of the programmable switching power supply is further connected to a dc power supply, the dc power supply is an ac/dc converter, and the ac/dc converter converts ac power into dc power and outputs the dc power to the programmable switching power supply.
In this embodiment, the programmable switching power supply is model LT3680, and transforms the 24V dc output by the ac/dc converter and transmits the dc to the primary noise suppression circuit.
A second inductor L1 and a first diode D1 are further arranged between the programmable switching power supply and the primary noise suppression circuit, wherein a first end of the second inductor L1 is connected with a cathode of the first diode D1 and an output end of the programmable switching power supply, and a second end of the second inductor L1 is connected with the primary noise suppression circuit. The anode of the first diode D1 is grounded.
In this embodiment, the driving circuit based on the programmable switching power supply further includes a signal acquisition circuit, an input end of the signal acquisition circuit is connected to the third-level noise suppression circuit, and an output end of the signal acquisition circuit is connected to the main control circuit, and is configured to output the voltage signal to the main control circuit after analog-to-digital conversion.
Because the noise generated by the programmable switching power supply under different output voltages is different, in order to better suppress the noise, the driving circuit based on the programmable switching power supply further comprises a feedback circuit, the feedback circuit comprises a feedback circuit noise filter and a control output feedback circuit, two ends of the feedback circuit noise filter and the control output feedback circuit are respectively connected with the output ends of the programmable switching power supply and the sampling circuit, the control output feedback circuit is further connected with a main control circuit, and the main control circuit performs output feedback through the control output feedback circuit. Therefore, the main control circuit adjusts and controls the feedback effect of the output feedback circuit according to the actual condition of the noise, and the noise is better suppressed.
In a preferred embodiment, the control output feedback circuit includes a first operational amplifier U2A, a first resistor R1, and a second resistor R2, an output terminal of the first operational amplifier U2A is connected to a feedback terminal of the programmable switching power supply and a first terminal of the first resistor R1, a second terminal of the first resistor R1 is connected to a first input terminal of the first operational amplifier U2A, a first terminal of the second resistor R2 is connected to a second input terminal of the first operational amplifier U2A, a second terminal of the second resistor R2 is connected to a main control circuit, and the main control circuit is connected to an output terminal of the sampling circuit.
In a specific embodiment, the main control circuit is a single chip, and the second end of the second resistor R2 is connected to an I/O pin of the single chip.
The feedback circuit noise filter comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, wherein first ends of the first capacitor C1 and the second capacitor C2 are connected with a compensation end of the programmable switching power supply, a second end of the first capacitor C1 is connected with a first end of a third resistor R3, a second end of the third resistor R3 is connected with a second end of a second capacitor C2, first ends of the fourth resistor R4 and the fifth resistor R5 are connected with a second end of the third resistor R3, a second end of the fifth resistor R5 is connected with a first end of the third capacitor C3, and a second end of the third capacitor C3 is connected with a second end of the fourth resistor R4 and an output end of the sampling circuit.
In this embodiment, the one-stage noise suppression circuit includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and a first inductor L2, one end of the first inductor L2 is connected to the voltage output terminal of the programmable switching power supply and the first ends of the fourth capacitor C4 and the sixth capacitor C6, the other end of the first inductor L is connected to the first ends of the fifth capacitor C5 and the seventh capacitor C7, and the second ends of the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are grounded. High frequency noise in the drive circuit is suppressed by a one-stage noise suppression circuit.
The two-stage noise suppression circuit comprises an eighth capacitor C8 and a ninth capacitor C9, wherein the first end of the eighth capacitor C8 is connected with the input end of the sampling circuit and the first end of the seventh capacitor C7, the second end of the eighth capacitor C3526 is grounded, the first end of the ninth capacitor C9 is connected with the output end of the sampling circuit, and the second end of the ninth capacitor C9 is grounded. The eighth capacitor C8 and the ninth capacitor C9 are decoupling capacitors and are disposed on two sides of the sampling resistor R6.
The bias noise suppression circuit comprises a differential amplifier U1A, a sixth resistor R8, a seventh resistor R9 and an eighth resistor R10, wherein a first input end of the differential amplifier U1A is connected with an input end of a sampling circuit, a first power supply end of the differential amplifier U1A, a first end of a sixth resistor R8 and a first end of a seventh resistor R9, a second input end of the differential amplifier U1A is connected with an output end of the sampling circuit, a second power supply end of the differential amplifier U1A, a second end of a seventh resistor R9 and a first end of an eighth resistor R10, an output end of the differential amplifier U1A is connected with the three-stage noise suppression circuit, and an adjusting end of the seventh resistor R9 is connected with the main control circuit. The seventh resistor R9 is an adjustable resistor, the differential amplifier U1A is used as a signal amplifying circuit, and the voltage signal on the sampling resistor R6 is amplified by the differential amplifier U1A. The main control circuit reads the voltage value of the output end of the differential amplifier U1A, and adjusts the resistance value of the seventh resistor R9 according to the voltage value to enable the voltage values of the first ends of the sixth resistor R8 and the eighth resistor R10 to be zero, so that noise filtering is achieved.
In this embodiment, the three-stage noise suppression circuit includes a ninth resistor R7, a tenth capacitor C10, a tenth resistor R11, an eleventh capacitor C11, and a second operational amplifier U1B, wherein a first end of the ninth resistor R7 is connected to an output end of the differential amplifier U1A, a second end of the ninth resistor R7 is connected to a first end of the tenth capacitor C10 and a non-inverting input end of the second operational amplifier U1B, a second end of the tenth capacitor C10 is connected to an inverting input end of the differential amplifier U1A, a first end of the tenth resistor R11 and a first end of the eleventh capacitor C11, and an output end of the second operational amplifier U1B is connected to a second end of the tenth resistor R11, a second end of the eleventh capacitor C11, and the main control circuit.
The drive circuit based on the programmable switching power supply further comprises an upper computer, the upper computer is in communication connection with the main control circuit, and the upper computer acquires current measurement information of the drive circuit through the main control circuit.
In a specific embodiment, the upper computer is a computer, the main control circuit is a single chip microcomputer, the computer is connected with the single chip microcomputer through a USB line to acquire current measurement information of the driving circuit, and states of voltage, switch and the like output by the driving circuit are controlled through the single chip microcomputer.
In the embodiment, the drive circuit based on the programmable switching power supply serially filters noise by adopting the first-level, second-level and third-level noise suppression circuits according to circuit parameters, the bias noise suppression circuit and the feedback circuit filter are parallel to suppress circuit noise, and the complex noise filter combination can enable circuit signal acquisition to be more stable.
In this embodiment, in order to improve the accuracy of current measurement, the main control circuit calculates and compensates the actual value of noise according to the collected voltage signal to obtain the real current value.
In this embodiment, the calculation formula for performing compensation is y ═ (x- (u × a + b)) × c-d, where y is the current value calculated by the main control circuit; x is the voltage value that main control circuit gathered through signal acquisition circuit, u is the voltage that drive circuit actually exported to the load or the voltage that the user set for exporting to the load (the voltage that uses actually to export to the load is used preferentially), a, b: calculating an initial value through a regression algorithm as an initial value; c is a compensation coefficient; d is a compensation value.
Please look at table one, which is the compensation coefficient table.
| Measuring current range | Gear compensation |
| The measured value is more than or equal to 25mA | 0.987 |
| 25mA>The measured value is more than or equal to 2.5mA | 0.998 |
| 2.5mA>The measured value is more than or equal to 0.25mA | 0.965 |
| 0.25mA>Measured value≥0.025mA | 0.821 |
| 0.025mA>Measured value>0 | 0.821 (estimate) |
Table one, compensation coefficient table
In a specific embodiment, the compensation value is zero.
The utility model adopts the programmable switching power supply to drive the load, can continuously output the voltage and can measure the load of weak current with high precision and high integration. The power supply noise is dynamically adjusted and calibrated in a software and hardware combined mode, the current measurement error is corrected, and the purposes and requirements of measuring the current with high precision and wide range are achieved. The required voltage is flexibly output, and the requirement of high-precision weak current measurement is met.
The method can accurately overcome the defect of weak current precision in the full range, and provides the automatic calibration and weak current measurement with low cost, high precision and high integration.
Has the advantages that: the drive circuit based on the programmable switching power supply is provided with the noise suppression circuit and the sampling circuit in the drive circuit, utilizes the noise suppression circuit to filter noise in the drive circuit, transmits a voltage signal of the sampling circuit to the noise circuit, and transmits the processed noise in the voltage signal to the main control circuit after the noise suppression circuit processes the noise in the voltage signal, thereby avoiding the influence of the noise on current measurement, not only flexibly outputting the required voltage, but also meeting the requirement of high-precision weak current measurement, and being convenient for effectively protecting and controlling electronic products.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A programmable switching power supply based driving circuit, comprising: the noise suppression circuit is respectively connected with the programmable switching power supply, the main control circuit and the sampling circuit;
one end of the sampling circuit is connected with the noise suppression circuit, and the other end of the sampling circuit is connected with a load and used for converting a current signal in a driving circuit based on a programmable switching power supply into a voltage signal;
noise suppression circuit includes one-level noise suppression circuit, second grade noise suppression circuit, bias noise suppression circuit, tertiary noise suppression circuit, one-level noise suppression circuit both ends respectively with programmable switching power supply, sampling circuit connect, second grade noise suppression circuit with sampling circuit connects, bias noise suppression circuit one end with sampling circuit, second grade noise suppression circuit connect, the other end with tertiary noise suppression circuit connects, tertiary noise suppression circuit's output with master control circuit connects, noise suppression circuit is arranged in the noise of filtering drive circuit and behind the noise of will filtering voltage signal transmits for master control circuit so that master control circuit passes through current in the voltage signal measurement drive circuit.
2. The programmable switching power supply-based driving circuit according to claim 1, wherein the programmable switching power supply-based driving circuit further comprises a signal acquisition circuit, an input end of the signal acquisition circuit is connected to the three-stage noise suppression circuit, and an output end of the signal acquisition circuit is connected to the main control circuit, and is configured to output the voltage signal to the main control circuit after analog-to-digital conversion.
3. The programmable switching power supply-based driving circuit according to claim 1, further comprising a feedback circuit, wherein the feedback circuit comprises a feedback circuit noise filter and a control output feedback circuit, two ends of the feedback circuit noise filter and the control output feedback circuit are respectively connected to the output ends of the programmable switching power supply and the sampling circuit, the control output feedback circuit is further connected to the main control circuit, and the main control circuit performs output feedback through the control output feedback circuit.
4. The programmable switching power supply-based driving circuit according to claim 3, wherein the control output feedback circuit comprises a first operational amplifier, a first resistor and a second resistor, an output terminal of the first operational amplifier is connected to the feedback terminal of the programmable switching power supply and a first terminal of the first resistor, respectively, a second terminal of the first resistor is connected to a first input terminal of the first operational amplifier, a first terminal of the second resistor is connected to a second input terminal of the first operational amplifier, a second terminal of the second resistor is connected to the main control circuit, and the main control circuit is connected to an output terminal of the sampling circuit.
5. The programmable switching power supply-based driving circuit as claimed in claim 3, wherein the feedback circuit noise filter includes a first capacitor, a second capacitor, a third resistor, a fourth resistor, and a fifth resistor, first ends of the first capacitor and the second capacitor are connected to the compensation terminal of the programmable switching power supply, a second end of the first capacitor is connected to a first end of the third resistor, a second end of the third resistor is connected to a second end of the second capacitor, first ends of the fourth resistor and the fifth resistor are connected to a second end of the third resistor, a second end of the fifth resistor is connected to a first end of the third capacitor, and a second end of the third capacitor is connected to a second end of the fourth resistor and an output terminal of the sampling circuit.
6. The programmable switching power supply-based driving circuit as claimed in claim 1, wherein the primary noise suppression circuit includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a first inductor, one end of the first inductor is connected to the voltage output terminal of the programmable switching power supply and the first ends of the fourth capacitor and the sixth capacitor, the other end of the first inductor is connected to the first ends of the fifth capacitor and the seventh capacitor, and the second ends of the fourth capacitor, the fifth capacitor, the sixth capacitor, and the seventh capacitor are grounded.
7. The programmable switching power supply based driving circuit as claimed in claim 6, wherein the second-stage noise suppression circuit comprises an eighth capacitor and a ninth capacitor, a first terminal of the eighth capacitor is connected to the input terminal of the sampling circuit and the first terminal of the seventh capacitor, a second terminal of the eighth capacitor is connected to ground, a first terminal of the ninth capacitor is connected to the output terminal of the sampling circuit, and a second terminal of the ninth capacitor is connected to ground.
8. The programmable switching power supply based driving circuit according to claim 1, wherein the bias noise suppression circuit comprises a differential amplifier, a sixth resistor, a seventh resistor, and an eighth resistor, a first input terminal of the differential amplifier is connected to the input terminal of the sampling circuit, a first power terminal of the differential amplifier, a first terminal of the sixth resistor, and a first terminal of the seventh resistor, a second input terminal of the differential amplifier is connected to the output terminal of the sampling circuit, a second power terminal of the differential amplifier, a second terminal of the seventh resistor, and a first terminal of the eighth resistor, an output terminal of the differential amplifier is connected to the three-stage noise suppression circuit, and a regulation terminal of the seventh resistor is connected to the main control circuit.
9. The programmable switching power supply based driving circuit as claimed in claim 8, wherein the three-stage noise suppression circuit comprises a ninth resistor, a tenth capacitor, a tenth resistor, an eleventh capacitor, and a second operational amplifier, a first end of the ninth resistor is connected to the output terminal of the differential amplifier, a second end of the ninth resistor is connected to the first end of the tenth capacitor and the non-inverting input terminal of the second operational amplifier, a second end of the tenth capacitor is connected to the inverting input terminal of the differential amplifier, the first end of the tenth resistor and the first end of the eleventh capacitor, and an output terminal of the second operational amplifier is connected to the second end of the tenth resistor, the second end of the eleventh capacitor, and the main control circuit.
10. The programmable switching power supply-based driving circuit according to claim 1, further comprising an upper computer, wherein the upper computer is in communication connection with the main control circuit, and the upper computer obtains current measurement information of the driving circuit through the main control circuit.
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| CN202121493157.4U CN215452766U (en) | 2021-07-01 | 2021-07-01 | Driving circuit based on programmable switching power supply |
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